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Небесная энциклопедия

Космические корабли и станции, автоматические КА и методы их проектирования, бортовые комплексы управления, системы и средства жизнеобеспечения, особенности технологии производства ракетно-космических систем

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Мониторинг СМИ

Мониторинг СМИ и социальных сетей. Сканирование интернета, новостных сайтов, специализированных контентных площадок на базе мессенджеров. Гибкие настройки фильтров и первоначальных источников.

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Поддерживает ввод нескольких поисковых фраз (по одной на строку). При поиске обеспечивает поддержку морфологии русского и английского языка
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Применить Всего найдено 3233. Отображено 100.
26-01-2012 дата публикации

Method And An Interconnecting Node For Use In An Access Network

Номер: US20120020668A1
Автор: Elmar Trojer, Per-Erik Eriksson
Принадлежит: Telefonaktiebolaget LM Ericsson AB

The invention relates to an interconnecting node for use in interconnecting a passive optical network (PON) and a copper wire xDSL access network, wherein said interconnecting node comprises an optical network unit (ONU) arranged to be connected to an optical line termination (OLT) over the PON network; and at least one xDSL access device connectable to at least one user end xDSL equipment over the copper wire xDSL access network. The interconnecting node is characterized in thatit further comprises a clocking interconnect between the ONU unit and the at least one xDSL access device arranged to distribute a clock signal obtained from optical network transmissions received in the ONU unit over the PON network to an timing reference input of the at least one xDSL access device. The invention also relates to a further interconnecting node, methods for use in interconnecting nodes, a central office optical network apparatus and an access network.

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Номер записи: 1
10-05-2012 дата публикации

System and method for synchronizing operations among a plurality of independently clocked digital data processing devices

Номер: US20120117200A1
Автор: Nicholas A. J. Millington
Принадлежит: Individual

A system is described for maintaining synchrony of operations among a plurality of devices having independent clocking arrangements. A task distribution device is to distribute tasks to a synchrony group comprising a plurality of devices to perform tasks distributed by the task distribution device in synchrony. The task distribution device distributes each task to synchrony group members over a network. Each task is associated with a time stamp that indicates a time, relative to a clock maintained by the task distribution device, at which synchrony group members are to execute the task. Each synchrony group member periodically obtains from the task distribution device an indication of current time indicated by its clock, determines a time differential between the task distribution device's clock and its respective clock and determines therefrom a time at which, according to its respective clock, the time stamp indicates that it is to execute the task.

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Номер записи: 2
07-06-2012 дата публикации

Data Sensor Coordination Using Time Synchronization in a Multi-Bus Controller Area Network System

Номер: US20120140861A1
Автор: Chaminda Basnayake, Sandeep MENON
Принадлежит: GM GLOBAL TECHNOLOGY OPERATIONS LLC

A method is provided for synchronizing time in an unsynchronized vehicle controller area network system. A master control unit receives a global time from a time synchronization source. The master control unit estimates a respective time delay in transmitting messages by electronic control units on each controller area network bus. The time delay is a difference between a time when a message is generated by a respective electronic control unit for transmission on a respective controller area network bus and a time when the message is transmitted on the respective controller area network bus. The global time is adjusted for each respective controller area network bus based on the estimated time delays associated with each respective controller area network bus. Global time messages from the master control unit are transmitted to each electronic control unit that include the adjusted global times for an associated controller area network bus.

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Номер записи: 3
21-06-2012 дата публикации

Systems and methods for interrogator multiple radio frequency identification enabled documents

Номер: US20120154121A1
Автор: John Azevedo, Jun Liu, Rodolfo Monsalvo
Принадлежит: Neology Inc

A multi-document read-write station provides the ability to read/write to a stack of Radio Frequency Identification (RFID) tags within a small area. Specifically, the station provides the ability to read from and write to a tall stack of RFID tagged sheets with the RFID tags stacked one on top of the other. The station and capability described herein is the result of and comprises several components including a closed chamber comprising a document slot, an antenna system, and a power management system.

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Номер записи: 4
21-06-2012 дата публикации

Wireless communication system, wireless base station, control method, and control device

Номер: US20120156987A1
Автор: Eiji Nakayama
Принадлежит: Kyocera Corp

Each of the plurality of wireless base stations determines whether the accuracy of a synchronizing signal generated at a corresponding synchronizing signal generation unit is below a predetermined level, and when the accuracy of synchronizing signal is below the predetermined level, refers to the management unit to determine whether there is, among other wireless base stations arranged adjacent to its own station, a wireless base station connected to a synchronizing signal generation unit differing from its own connected synchronizing signal generation unit, and when there is a wireless base station connected to a synchronizing signal generation unit differing from its own connected synchronizing signal generation unit, reducing its own transmission power.

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Номер записи: 5
26-07-2012 дата публикации

System and method for synchronizing operations among a plurality of independently clocked digital data processing devices

Номер: US20120192071A1
Автор: Nicholas A. J. Millington
Принадлежит: Individual

A system is described for maintaining synchrony of operations among a plurality of devices having independent clocking arrangements. A task distribution device is to distribute tasks to a synchrony group comprising a plurality of devices to perform tasks distributed by the task distribution device in synchrony. The task distribution device distributes each task to synchrony group members over a network. Each task is associated with a time stamp that indicates a time, relative to a clock maintained by the task distribution device, at which synchrony group members are to execute the task. Each synchrony group member periodically obtains from the task distribution device an indication of current time indicated by its clock, determines a time differential between the task distribution device's clock and its respective clock and determines there from a time at which, according to its respective clock, the time stamp indicates that it is to execute the task.

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Номер записи: 6
14-02-2013 дата публикации

Time Synchronization Using Packet-Layer and Physical-Layer Protocols

Номер: US20130039359A1
Автор: P. Stephan Bedrosian
Принадлежит: LSI Corp

In certain embodiments, a slave clock node in a wireless packet network achieves time synchronization with a master clock node by implementing a packet-layer synchronization procedure, such as the IEEE1588 precision timing protocol (PTP), to set the slave's local time based on the master's time. The slave's local time is then maintained by implementing a physical-layer syntonization procedure, such as synchronous Ethernet, without relying on the packet-layer synchronization procedure. The packet-layer synchronization procedure may be selectively employed to adjust the slave's local time (if needed) after significant periods of time (e.g., substantially greater than one second). Both the packet-layer synchronization procedure and the physical-layer syntonization procedure are traceable to a common reference timescale (e.g., UTC). Depending on the implementation, the packet-layer synchronization procedure can be, but does not have to be, terminated when not being employed to adjust the slave's local time.

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Номер записи: 7
18-04-2013 дата публикации

System and method for synchronizing operations among a plurality of independently clocked digital data processing devices

Номер: US20130094670A1
Автор: Nicholas A. J. Millington
Принадлежит: Sonos Inc

An audio information source interface that receives first audio information from an audio information source directly connected to the audio playback device; an ADC configured to sample the first audio information; a network interface configured to connect the audio playback device to a network and to receive packets from the network containing second audio information and playback timing information from a network audio information source; a DAC for generating an analog audio signal based on either the first or second audio information; an audio amplifier interconnected with the DAC and configured to amplify the audio signal; an audio reproduction device interface interconnected with the audio amplifier; and, a control module configured to receive commands via the network interface and to provide to the DAC one of the first or second audio information.

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Номер записи: 8
09-05-2013 дата публикации

Grid load synchronization device and method

Номер: US20130116844A1
Автор: John M. McNally, Peter Gottlieb
Принадлежит: A123 Systems Inc

The grid load synchronization system described herein permits proactive mitigation of the effects of large loads transitioning on and off the power grid and the resultant risks and power quality issues associated therewith. The disclosed proactive system permits a grid-connected power consumer to synchronize demand with power storage equipment in real time using a digital communication link. The power consumer transmits requests to bring a load online or offline to a control site. The control site coordinates power grid source(s) and power grid loads to maintain power quality when loads go on and offline. The control sites manage requests from multiple power consumers and schedule the various loads for the consumers to mitigate the effects of large loads transitioning on and off the power grid. The resulting power quality can be guaranteed when adequate battery resources are made proactively available, rather than reacting to line conditions to engage compensation actions.

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Номер записи: 9
30-05-2013 дата публикации

Method and System for Cross-Protocol Time Synchronization

Номер: US20130138826A1
Автор: Curtis Ling, Timothy Gallagher
Принадлежит: Individual

Methods and systems for cross-protocol time synchronization may comprise, for example in a premises-based network, receiving a signal that conforms to a first communications protocol (e.g., a general-purpose communications protocol), extracting a global time of day (GTOD) clock from the received signal; and synchronizing communication on the premises-based network in accordance with a second communication protocol, based at least in part on the extracted GTOD clock. The first communications protocol may comprise data over cable service interface specification (DOCSIS) or any protocol that provides a GTOD. The second communication protocol may comprise a multimedia over cable alliance (MoCA) standard, an IEEE 802.11x standard, or any non-public wireless network protocol. The GTOD clock may comprise a GPS clock, a GLONASS clock, and/or a Galileo clock. One or more of the networked devices may comprise a network controller, where the network controller comprises wireless network and wired network capability.

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Номер записи: 10
15-08-2013 дата публикации

System and method for synchronizing operations among a plurality of independently clocked digital data processing devices

Номер: US20130208911A1
Автор: Nicholas A. J. Millington
Принадлежит: Sonos Inc

In a network comprising at least a first zone player and a second zone player, a method comprising: receiving, at a user interface module, a command to establish a synchrony group, wherein the synchrony group comprises at least the first zone player and the second zone player; and displaying, at the user interface module, a list of information identifying a plurality of items queued for playback by the synchrony group, wherein (i) at least one of the items on the list has associated location data indicating the at least one item is located on a device attached to the local area network, and (ii) at least one other of the items on the list has associated location data indicating the at least one other item is located on a wide area network.

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Номер записи: 11
29-08-2013 дата публикации

System and method for synchronizing operations among a plurality of independently clocked digital data processing devices

Номер: US20130226323A1
Автор: Nicholas A. J. Millington
Принадлежит: Sonos Inc

An audio processing device comprising: a network interface configured to connect the audio processing device to a network; an audio information channelization device connected to the network interface and configured to receive audio via the network interface; an audio reproduction device interface configured to output audio to a playback device; a user interface module interface configured to transmit, via the network interface to a user interface module, status information pertaining to the status of a synchrony group, wherein the audio processing device is a member of the synchrony group with at least one additional audio processing device.

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Номер записи: 12
05-09-2013 дата публикации

Time synchronization method and time synchronization device for mobile communications system

Номер: US20130230041A1
Автор: Han Li, Lei Wang, Liuyan Han
Принадлежит: China Mobile Communications Group Co Ltd

The present invention discloses a time synchronization method and a time synchronization device for a mobile communication system. When the time status of one type of time protocol is bad, a different type of time protocol having a better status can be automatically selected, thereby the system flexibility and the time information quality and reliability can be effectively enhanced. The time synchronization method for a mobile communication system may comprise: selecting respectively an optimal time source for each type of time protocol port of at least two types of time protocol ports; selecting a system optimal time source from optimal time sources for respective types of time protocol ports.

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Номер записи: 13
05-09-2013 дата публикации

System and method for synchronizing operations among a plurality of independently clocked digital data processing devices

Номер: US20130231766A1
Автор: Nicholas A. J. Millington
Принадлежит: Sonos Inc

A plurality of zone players, including at least a first player and a second zone player, wherein the first zone player is designated as a master device of a synchrony group, a method comprising: determining, by the first zone player, that the second zone player should be designated as the master device of the synchrony group; instructing, by the first zone player, the second zone player to be designated as the master device of the synchrony group; and causing, at the first zone player, the first zone player to lose its designation as the master device of the synchrony group.

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Номер записи: 14
05-09-2013 дата публикации

System and method for synchronizing operations among a plurality of independently clocked digital data processing devices

Номер: US20130232214A1
Автор: Nicholas A. J. Millington
Принадлежит: Sonos Inc

In a network comprising a plurality of zone players, including at least a first zone player and a second zone player, a method comprising: receiving, by the first zone player, first control information from a user interface module; based on the received first control information, transmitting, by the first zone player, second control information to the second zone player, wherein the second control information comprises (i) a network address of an audio information channelization device that provides audio information and playback timing information, and (ii) a multicast address that the audio information channelization device uses to broadcast audio information and playback timing information to the network; and playing, by the first zone player, the audio information in synchrony with the second zone player.

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Номер записи: 15
24-10-2013 дата публикации

Synchronization topology and route analytics integration

Номер: US20130283174A1
Автор: Greg Soprovich, Lida Faridian, Michael Jhu, Neelam Khatri
Принадлежит: Alcatel Lucent Canada Inc

Various exemplary embodiments relate to a method and related network node including one or more of the following: displaying, by the network management system, a first representation of a synchronization topology, wherein the synchronization topology includes a set of network elements and a set of peers; identifying a set of peers to be monitored; receiving an indication that a network path associated with a peer of the set of peers to be monitored has changed; and displaying an alarm indication.

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Номер записи: 16
19-12-2013 дата публикации

Method For Operating A Network Arrangement, Network System And Network Arrangement

Номер: US20130336338A1
Автор: Armbruster Michael, Fiege Ludger, Riedl Johannes, Schmid Thomas, Zirkler Andreas
Принадлежит:

A method for operating a network arrangement having a plurality of network systems is disclosed. Data belonging to a first class is synchronously transmitted in a specified time slot identical for all network systems. A network system, which owing to a synchronization error during the specified time slot, receives data belonging to other classes from a plurality of senders, then only sends data belonging to the first class, but now in standard messages belonging to class 2. Non-vital data belonging to the other classes is no longer transmitted in this operating state. Improved failure safety and in particular a fail-operational mode is provided by the behavior of the network systems in the event of synchronization errors. A network system which implements the method and a network arrangement having a plurality of corresponding network systems is also proposed. 1. A method for operating a network arrangement having a plurality of network systems communicatively coupled to each other , comprising:transmitting data belonging to a first class in at least one specified time slot identical for all network systems, andat least one network system, which during the specified time slot receives data belonging to at least one class other than the first class, at least temporarily sending or forwarding only data belonging to the first class.2. The method of claim 1 , wherein the data belonging to the first class is synchronously transmitted between the network systems during the specified time slot.3. The method of claim 1 , wherein the data belonging to the first class is transmitted only during the specified time slot.4. The method of claim 1 , wherein the specified data belonging to the first class is provided with a class mark according to an IEEE 802.1p standard.5. The method of claim 1 , further comprising in at least one network system claim 1 , checking whether data other than that belonging to the first class arrives during the specified time slot.6. The method of ...

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Номер записи: 17
20-02-2014 дата публикации

Synchronization control system

Номер: US20140050232A1
Автор: Akinori Hirose, Akira Kawarada, Hideaki Sugiura, Kazuto Fukushima
Принадлежит: Toshiba Corp

According to an embodiment, the transmission processor of the master terminal includes a sending/receiving processor which sends a synchronization request demanding packet to a particular slave terminal and sends a synchronization reply packet when receiving a synchronization request packet from the slave terminal that has received the synchronization request demanding packet, and a synchronization controller which calculates a synchronization band from the time of the receipt of the data packet and from time information added to the received data packet to determine a synchronization state and which adjusts a correction amount in accordance with the synchronization state and sends an internal timing correction command to the timing generator.

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Номер записи: 18
27-02-2014 дата публикации

Spectrum Management and Timing Optimization Over Multiple Distribution Points

Номер: US20140056312A1
Автор: Rainer Strobel
Принадлежит: LANTIQ DEUTSCHLAND GMBH

Presented are systems and methods for spectrum management and timing optimization of communication networks have multiple distribution points, multiple remote transceivers, and a shared communication binder. In some embodiments, distribution points and communication lines are added to an active network by the allocation of unused time slots. In some embodiments, transmission collisions, near-end cross-talk, and far-end cross-talk, are predicted upon the addition of added distribution points and communication lines, and techniques are applied to reduce or cancel such phenomena.

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Номер записи: 19
20-03-2014 дата публикации

Remote timing communications

Номер: US20140079393A1
Автор: Gregory A. Wolfe, Michael Bugenhagen
Принадлежит: CENTURYLINK INTELLECTUAL PROPERTY LLC

A system, method, and optical switch for communicating timing. A determination is made whether one of a number of data streams are available. Packets are received at a remote node in response to determining one of the number of data streams is available. A timing characteristic of the at least one of the packets is associated with a tick of a reference clock. The tick of the reference clock is extracted utilizing the timing characteristic of the at least one of the packets. A secondary clock is disciplined with the reference clock by adjusting the secondary clock based on a difference between times measured by the reference clock and the secondary clock to generate a clock signal. The clock signal is communicated to one or more interfaces for distributing.

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Номер записи: 20
27-03-2014 дата публикации

Synchronization distribution in microwave backhaul networks

Номер: US20140086375A1
Автор: Peter Croy, Philip Secker
Принадлежит: Aviat US Inc

In some embodiments, a system comprises a clock, a root node, a radio channel network, and first and second child nodes. The clock may be configured to generate a clock signal. The root node may be configured to generate a first frame including a first payload and a first overhead and generate a second frame including a second payload and a second overhead. The first and second overheads may comprise a synchronization value based on the clock signal. The radio channel network may be in communication with the root node for transmitting the first and second frames. Each first and second child nodes may be configured to perform clock recovery including frequency synchronization using the synchronization value and a respective phase-lock loop.

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Номер записи: 21
27-03-2014 дата публикации

Wind turbine control system with decentralized voting

Номер: US20140086723A1
Автор: John Bengtson, Kenneth Skaug, Philip Carne Kjaer, Victor Donescu
Принадлежит: Vestas Wind Systems AS

The present invention relates to a fault-tolerant control system for a wind turbine comprising a plurality of controllable wind turbine components, the control system comprising control means for generating a replica of essentially concurrent set-point values, a data communication network for transmitting the replica of essentially concurrent set-point values to the plurality of wind turbine components, and a plurality of decentralised voting means being arranged so that a decentralised voting means is assigned to each wind turbine component, each decentralised voting means being adapted to select one set-point value out of the replica of set-point values. The present invention further relates to a wind turbine and to an associated method.

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Номер записи: 22
10-04-2014 дата публикации

Externally Connected Time Port Changeover Method and Device

Номер: US20140098827A1
Автор: Hailiang ZHAN, Xiaoxia Li
Принадлежит: ZTE Corp

Disclosed are externally connected time port changeover method and device. The method includes: a node serving as a GM node transmitting time information via a first externally connected time port of the node; if the first externally connected time port fails, the node updating current node priority and GM node priority of the node as preset node priority which is node priority configured for the node when the node is activated; and the node judging whether a second externally connected time port of the node is up and the priority of the second externally connected time port is higher than the current GM node priority, if so, activating the second externally connected time port to transmit the time information. The problem that when the currently selected time access port has failed, changeover among ports cannot be completed in time is solved, thus improving the stability of the time synchronization network.

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Номер записи: 23
13-01-2022 дата публикации

Systems and methods for synchronizing transmission of wireless data

Номер: US20220014295A1
Автор: Casper Stork Bonde, Douglas Warren Young, Rasmus Abildgren
Принадлежит: Bose Corp

An audio system, method, and computer program product for synchronizing device clocks. The systems, methods and computer program product can establish a first isochronous data stream between a peripheral device and a first device and establish a second isochronous data stream between the first device and a second device to send data between the first and second device. As the two data streams may rely on two different device clocks, e.g., one clock which defines the timing for the first isochronous data stream and a second clock which defines the timing for the second isochronous data stream, the systems, methods, and computer program disclosed herein are configured to maintain synchronization and/or synchronize the first clock with the second clock to prevent data loss due to clock drift.

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Номер записи: 24
07-01-2016 дата публикации

Clock synchronization in cloud computing

Номер: US20160006804A1
Автор: Chandrashekhar G. Deshpande, Gandhi Sivakumar, Jigneshkumar K. Karia, Shankar S. Kalyana
Принадлежит: International Business Machines Corp

Method of clock synchronization in cloud computing. A plurality of physical computer assets are provided. The plurality of physical computer assets are linked together to form a virtualized computing cloud, the virtualized computing cloud having a centralized clock for coordinating the operation of the virtualized computing cloud; the virtualized computing cloud is logically partitioned into a plurality of virtualized logical server clouds, each of the virtualized logical server clouds having a local clock synchronized to the same centralized clock; a clock type from a clock palette is selected for at least one of the virtualized logical server clouds; the clock type is implemented in the at least one of the virtualized logical server clouds such that the clock type is synchronized to the at least one of the virtualized logical server clouds; and the centralized clock is disabled. The method may be performed on one or more computing devices.

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Номер записи: 25
07-01-2021 дата публикации

METHOD, SYSTEM, AND DEVICE FOR SEAMLESS FAULT TOLERANT CLOCK SYNCHRONIZATION IN A VEHICLE COMMUNICATION SYSTEM

Номер: US20210006344A1
Автор: Agrawal Samir, Chen Luna, Kim Yongbum, Petree Jerry L., Saini Jevin K., Vijayaraghavan Aswini
Принадлежит:

Methods, systems, and devices of the present disclosure are directed to providing seamless fault tolerant clock synchronization utilizing redundant reference clocks in a vehicle communication system. Redundant grandmaster clocks may be synchronized by utilizing clock signals sent between physical layers over a network, and derived clocks of network end devices may be synchronized using messages sent by the grandmaster clocks over the same or separate networks. The primary and backup grandmaster clocks may concurrently transmit synchronization messages to the network end devices. In this way, the grandmaster clocks may be synchronized to clock signals, and the network end devices may derive local clocks based on one, some, or all of the received messages transmitted over a network by the grandmaster clocks. 1. A backup grandmaster clock device , comprising:a clock;a memory;a physical layer (PHY), communicatively coupled to a network, to receive a primary clock signal and a primary clock synchronization message from a primary grandmaster clock device over the network and to generate a recovered clock signal based on the primary clock signal; anda processor that maintains the clock substantially synchronous with the recovered clock signal, wherein the processor generates a backup clock signal and a backup clock synchronization message based on the clock, and wherein the PHY transmits the backup clock signal and the backup clock synchronization message over the network.2. The device of claim 1 , wherein the memory comprises a predetermined holdover time interval claim 1 , and wherein the processor is further configured to:detect an absence of receipt of at least one of the primary clock signal and the primary clock synchronization message from the primary grandmaster clock device for the predetermined holdover time interval;in response to detecting an absence of the receipt, transmit the backup clock synchronization message over the network to one or more network end ...

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Номер записи: 26
07-01-2021 дата публикации

Clock Source Determining Method and Apparatus

Номер: US20210006345A1
Автор: Fangyuan ZHU, Yan Li
Принадлежит: Huawei Technologies Co Ltd

A clock source determining method and an apparatus are provided. The method includes: A session management network element receives a session request from a mobility management network element. The session request includes information about a network slice and a DNN, and the session request is used to request to create a session. The session management network element determines clock source information corresponding to both the information about the network slice and the DNN. The session management network element sends the clock source information to an access network device. The clock source information is used by the access network device to perform clock synchronization with a terminal device.

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Номер записи: 27
14-01-2016 дата публикации

TIME SYNCHRONIZATION METHOD AND SYSTEM

Номер: US20160013876A1
Автор: HE Li, LIU Dongjia, Wang Bin, Xia Liang, Zhang Junhui, ZHAO Hongguang
Принадлежит:

Disclosed are a time synchronization method and system. The method comprises: an NE and the upstream nodes of the NE are classified into the first level, and the downstream nodes of the NE are classified into the second level, where the first level priority of the first level is higher than the second level priority of the second level; an NE connected to the NE through a PTP synchronization link in the downstream node receives a first device priority of the NE and the first level priority from the NE; and after the NE receives the second device priority of an NE and the second level priority sent by the NE in the downstream nodes which is connected to the NE through the 1PPS+TOD synchronization link, determines that a clock parameter of the NE is optimal, and synchronizes the local clock to the NE 1. A time synchronization method , comprising:{'b': 1', '1', '1', '1, 'classifying a first Network Equipment (NE) and upstream nodes of the NE in a time network into a first level, and classifying downstream nodes of the NE into a second level, wherein a first level priority that needs to be used in time synchronization of the first level is higher than a second level priority that needs to be used in time synchronization of the second level, and an output port of the NE is connected to a 1 Pulse per Second+Time of Day (1PPS+TOD) synchronization link;'}{'b': 3', '1', '1', '1, 'receiving, by a third Network Equipment (NE) in the downstream nodes which is connected to the NE through a Precision Time Protocol (PTP) synchronization link, a first PTP announce message from the NE, wherein the first PTP announce message carries a first equipment priority of the NE and the first level priority;'}{'b': 3', '2', '1', '1', '1', '2, 'and after the NE receives a second PTP announce message sent by a second Network Equipment (NE) in the downstream nodes which is connected to the NE through the 1PPS+TOD synchronization link, determining that a clock parameter of the NE is optimal ...

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Номер записи: 28
17-01-2019 дата публикации

METHOD AND DEVICE FOR PERFORMING SYNCHRONIZATION BY D2D TERMINAL IN WIRELESS COMMUNICATION SYSTEM

Номер: US20190020431A1
Автор: CHAE Hyukjin, Seo Hanbyul
Принадлежит: LG ELECTRONICS INC.

Disclosed is a method for performing a synchronization by a device-to-device (D2D) terminal in a wireless communication system supporting D2D communication. More particularly, a method for performing a synchronization by a D2D terminal comprises the steps of: receiving a synchronization reference signal from a first synchronization source and performing a synchronization; and, if the quality of the synchronization reference signal does not meet a predetermined standard, changing the synchronization source into a second synchronization source. 1. A method of performing synchronization , which is performed by a D2D (device to device) UE in a wireless communication system supporting D2D communication , comprising the steps of:performing synchronization by receiving a synchronization reference signal from a first synchronization source; andif quality of the synchronization reference signal is equal to or less than a prescribed reference, changing a synchronization source into a second synchronization source.2. The method of claim 1 , wherein the quality of the synchronization reference signal corresponds to reception power of the synchronization reference signal received from the first synchronization source and wherein the prescribed reference corresponds to reception power to which a prescribed hysteresis level is applied of a synchronization reference signal received from the second synchronization source.3. The method of claim 2 , wherein scaling is performed on the reception power of the first synchronization source and the reception power of the second synchronization source to compare a reception power size of the first synchronization source with a reception power size of the second synchronization source.4. The method of claim 2 , wherein an offset is applied to the reception power of the first synchronization source or the reception power of the second synchronization source to compare a reception power size of the first synchronization source with a reception ...

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Номер записи: 29
17-01-2019 дата публикации

CROSS-LAYER TME SYNCHRONIZATION METHOD

Номер: US20190020432A1
Автор: CHAUDHARI QASIM MAHMOOD, QARAQE KHALID ALI, SERPDIN ERCHIN
Принадлежит: QATAR FOUNDATION FOR EDUCATION, SCIENCE AND COMMUNITY DEVELOPMENT

The cross-layer time synchronization method is a cross-layer synchronization approach that utilizes a timing recovery module at a physical layer (PHY), derives the information about the clock frequency offset from the timestamp-embedded message, and exploits it for synchronization at the higher layers. This approach either results in minimizing the cost of synchronization resulting in energy efficiency or improving the accuracy of the clock parameters' estimates by exploiting the PHY information. Some applications of this cross-layer technique include, but are not limited to, energy efficient wireless networks, cooperative networks or distributed MIMO networks. 1. A cross-layer time synchronization method , comprising the steps of:obtaining information about a clock frequency offset from a timestamp-embedded message provided by a physical layer (PHY) timing recovery module; andsynchronizing clock time of layers above the PHY using the information provided by the PHY timing recovery module;whereby multiple timing packet exchanges are avoided.2. The cross-layer time synchronization method as recited in claim 1 , further comprising the step of producing a plurality of samples at matched filter outputs during each interval of a symbol claim 1 , such that one of the samples is aligned with a maximum eye opening of a selected pulse shape.4. The cross-layer time synchronization method as recited in claim 3 , further comprising the step of calculating the base point index and the fractional change by modulo-1 counter interpolation control.5. The cross-layer time synchronization method as recited in claim 4 , further comprising the step of feeding the matched filter outputs to a zero-crossing timing error detector.6. The cross-layer time synchronization method as recited in claim 5 , wherein the step of synchronizing the clock time of the layers above the PHY comprises calculating a frequency offset based on a slope claim 5 , m claim 5 , of the fractional change claim 5 , μ( ...

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Номер записи: 30
16-01-2020 дата публикации

TIME SLOTTED BUS SYSTEM FOR MULTIPLE COUPLED DIGITAL PHASE-LOCKED LOOPS

Номер: US20200021296A1
Автор: Spijker Menno
Принадлежит:

An apparatus includes a plurality of digital phase-locked loops and a time slotted bus. The time slotted bus is configured to couple the plurality of digital phase-locked loops. The plurality of digital phase-locked loops may be configured to exchange parameters between two or more of the plurality of digital phase-locked loops using one or more time slots of the time slotted bus. 1. An apparatus comprising:a plurality of digital phase-locked loop circuits; anda time slotted bus coupling the plurality of digital phase-locked loop circuits, wherein (i) said digital phase-locked loop circuits are configured to exchange parameters between two or more of said plurality of digital phase-locked loop circuits using one or more respective time slots of a plurality of time slots of said time slotted bus, and (ii) at least two of said digital phase-locked loop circuits are configured to transmit parameter data to said time slotted bus during said one or more respective time slots of said plurality of time slots of said time slotted bus.2. The apparatus according to claim 1 , wherein each of said digital phase-locked loop circuits is configured to fetch data from or present data to said time slotted bus during said one or more respective time slots of said plurality of time slots of said time slotted bus.3. The apparatus according to claim 1 , wherein said time slotted bus comprises a first bus communicating parameter data and a second bus configured to identify said time slots.4. The apparatus according to claim 3 , wherein said time slotted bus further comprises an address generator driving said second bus.5. The apparatus according to claim 4 , wherein said address generator is configured to cycle through a number of addresses corresponding to the time slots associated with said plurality of digital phase-locked loop circuits.6. The apparatus according to claim 5 , wherein said number of addresses is an integer multiple of the number of said digital phase-locked loop ...

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Номер записи: 31
16-01-2020 дата публикации

End-to-end transparent clocks and methods of estimating skew in end-to-end transparent clocks

Номер: US20200021378A1
Автор: James Aweya
Принадлежит: British Telecommunications plc, Emirates Telecommunications Corp, Khalifa University of Science, Technology and Research (KUSTAR)

This invention relates to end-to-end transparent clocks and methods of estimating skew in end-to-end transparent clocks. Embodiments of the invention relate to techniques for estimating clock skew between a free-running clock in a transparent clock and a master clock, in particular by using the timing information embedded in timing messages passing through the transparent clock. Further embodiments of the invention set out uses of these estimates to modify the residence times computed by the transparent clock and a synchronization network including such transparent clocks.

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Номер записи: 32
16-01-2020 дата публикации

PEER-TO-PEER TRANSPARENT CLOCKS AND METHODS OF ESTIMATING SKEW IN PEER-TO-PEER TRANSPARENT CLOCKS

Номер: US20200021379A1
Автор: AWEYA James
Принадлежит:

This invention relates to peer-to-peer transparent clocks and methods of estimating skew in peer-to-peer transparent clocks. Embodiments of the invention relate to techniques for estimating clock skew between a free-running clock in a transparent clock and a master clock, in particular by using the timing information embedded in timing messages passing through the transparent clock. Further embodiments of the invention set out uses of these estimates to modify the residence times computed by the transparent clock and a synchronization network including such transparent clocks. 1. A method of estimating the skew of a local clock in a peer-to-peer transparent clock device connected in a network between a master device having a master clock and a slave device , the method including the steps of:sending timing messages from the master device to the slave device over the network, the timing messages passing through said transparent clock device;recording times of sending of said timing messages by the master device;extracting, in the transparent clock device, from timing messages sent from the master device to the slave device, the times of sending of said timing messages;recording the times of receipt by the transparent clock device of timing messages sent from the master device to the slave device;extracting, in the transparent clock device, from the timing messages, the total delay experienced by each timing message in passing from the master device to the transparent clock device, including the residence time in other transparent clock devices between the master device and the transparent clock device; andestimating the skew of the local clock compared to the master clock using a plurality of each of said extracted and recorded times.2. A method according to claim 1 , further including the step of syntonizing the local clock to the master clock.3. A method according to claim 1 , further including the step of computing modified residence times in the transparent clock ...

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Номер записи: 33
21-01-2021 дата публикации

TIME SYNCHRONIZATION DEVICE AND TIME SYNCHRONIZATION METHOD

Номер: US20210021362A1
Автор: Arai Kaoru, Hisashima Takaaki, Kurokawa Osamu, Matsumura Kazuyuki, Sakuma Hiroki, Sugiyama Ryuta, Tsuboi Shunichi
Принадлежит:

[Problem] It is possible to improve the quality of time information by suppressing a jump in time which arises when switching a transfer path in a BC apparatus to which transfer paths of time information of at least 2 systems are connected to an input side. 1. A time synchronization apparatus for performing time synchronization by transferring Coordinated universal time (UTC) transmitted from a Grand master clock (GM) apparatus , which receives the UTC as time information , via a plurality of Boundary Clock (BC) apparatuses connected by a transfer path and correcting time of each of one or more of the plurality of BC apparatuses to time of the GM apparatus ,the time synchronization apparatus being mounted on a specific BC apparatus, among the plurality of BC apparatuses, having an input side to which time information transfer paths of at least two systems of a 0-system and a 1-system having different transfer delays are connected, the time synchronization apparatus comprising:a holding unit configured to hold a 0-system correction value indicating a time error accumulated on a transfer path side of the 0-system and hold a 1-system correction value indicating a time error accumulated on a transfer path side of the 1-system;a detection unit configured to detect a failure in the transfer path of the 0-system or the 1-system;a correction unit configured to perform correction when a failure is detected by subtracting the 0-system correction value or the 1-system correction value relating to a normal transfer path from the UTC having the time error accumulated on a normal transfer path side; anda switching unit configured to switch to the normal transfer path side when a failure is detected such that the UTC obtained by the correction is transferred.2. The time synchronization apparatus according to claim 1 , whereinthe detection unit is configured to detect restoration of a failure of the transfer path of the 0-system or the 1-system;the correction unit is configured to ...

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Номер записи: 34
10-02-2022 дата публикации

Communication system

Номер: US20220045778A1
Автор: Daisuke Osagawa, Yuki Fujita
Принадлежит: Mitsubishi Electric Corp

A communication system ( 100 ) includes communication device ( 1 ) to communication device ( 9 ). Communication device ( 1 ) to communication device ( 9 ) select a first representative device that represents a same domain. Communication device ( 3 ) is selected from domain D ( 1 ), communication device ( 6 ) is selected from domain D ( 2 ), and communication device ( 9 ) is selected from domain D ( 3 ). For communication device ( 3 ), communication device ( 6 ), and communication device ( 9 ) selected from each domain, communication device ( 3 ) sets to communication device ( 3 ), communication device ( 6 ) sets to communication device ( 6 ), and communication device ( 9 ) sets to communication device ( 9 ), domain D ( 0 ) as a common domain to which communication device ( 3 ), communication device ( 6 ), and communication device ( 9 ) belong. Communication device ( 3 ), communication device ( 6 ), and communication device ( 9 ) select communication device ( 9 ) as a network grandmaster that is a second representative device that represents domain D ( 0 ).

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Номер записи: 35
28-01-2021 дата публикации

Wireless Audio Synchronization

Номер: US20210029453A1
Автор: Banerjee Debasmit, Elliot Michael William
Принадлежит: Bose Corporation

An audio distribution system includes an audio source; and a plurality of audio playback devices in communication with each other and with the audio source. A group of the audio playback devices are arranged to render audio content provided by the audio source in synchrony. One of the audio playback devices within the group is configured as an audio master which distributes audio content from the audio source to the other audio playback devices within the group, and one of the plurality of audio playback devices, other than the audio master, is configured as a clock master, which distributes clock information that the group of audio playback devices synchronizes to. 1. A system including a plurality of audio playback devices in communication with each other , the system comprising:a first audio playback device of the plurality of audio playback devices, wherein the first audio playback device is configured to distribute audio content to at least one other audio playback device of the plurality of audio playback devices; anda second audio playback device of the plurality of audio playback devices, the second audio playback device different from the first audio playback device, wherein the second audio playback device is configured to distribute clock information to at least one other audio playback device of the plurality of audio playback devices, and wherein the clock information is used to help determine playback timing for the audio content.2. The system of claim 1 , wherein the at least one other audio playback device that is configured to receive audio content from the first audio playback device includes the second audio playback device.3. The system of claim 1 , wherein the at least one other audio playback device that is configured to receive clock information from the second audio playback device includes the first audio playback device.4. The system of claim 1 , wherein the at least one other audio playback device that is configured to receive audio ...

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Номер записи: 36
04-02-2016 дата публикации

Systems and methods for providing resilience to lte signaling interference in wifi

Номер: US20160036467A1
Автор: Alireza Babaei, Jennifer Andreoli-Fang, Yimin Pang
Принадлежит: Cable Television Laboratories Inc

Systems and methods presented herein enhance WiFi communications in a RF band where conflicting LTE signaling exists. In one embodiment, a system includes a processor operable to detect the WiFi communications between a UE and a wireless access point of a WiFi network, to identify errors in the WiFi communications, and to determine a periodicity of the errors based on the LTE signaling structure. The system also includes an encoder communicatively coupled to the processor and operable to encode the WiFi communications with error correction, and to change the error correction based on the periodicity of the errors in the WiFi communications.

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Номер записи: 37
04-02-2016 дата публикации

LTE SIGNALING IN RF BANDS WITH COMPETING COMMUNICATION SYSTEMS

Номер: US20160036546A1
Автор: Andreoli-Fang Jennifer, Babaei Alireza, Campos Luis Alberto, Hamzeh Belal
Принадлежит:

Systems and methods presented herein provide for an LTE wireless communication system operating in a Radio Frequency (RF) band with a conflicting wireless system. The LTE system includes an eNodeB operable to detect a plurality of UEs in the RF band, to generate LTE frames for downlink communications to the UEs, and to time-divide each LTE frame into a plurality of subframes. The eNodeB is also operable to condense the downlink communications into a first number of the subframes that frees data from a remaining number of the subframes in each LTE frame, and to burst-transmit the first number of the subframes of each LTE frame in the RF band. 1. A Long Term Evolution (LTE) wireless communication system operating in a Radio Frequency (RF) band with a conflicting wireless system , the LTE system comprising:an eNodeB operable to detect a plurality of user equipment (UEs) in the RF band, to generate LTE frames for downlink communications to the UEs, to time-divide each LTE frame into a plurality of subframes, to condense the downlink communications into a first number of the subframes that frees data from a remaining number of the subframes in each LTE frame, and to burst-transmit the first number of the subframes of each LTE frame in the RF band.2. The LTE system of claim 1 , wherein:the eNodeB is further operable to reduce energy transmitted in the RF band during the remaining number of the subframes in each LTE frame to allow transmission by the conflicting wireless system.3. The LTE system of claim 1 , wherein:at least one of the first number of the subframes of the LTE frames comprises a reference signal that assist the UEs with channel estimation and detection.4. The LTE system of claim 1 , wherein:at least one of the first number of the subframes of the LTE frames comprises a control signal that provides synchronization for another eNodeB.5. The LTE system of claim 1 , wherein:at least one of the first number of the subframes of the LTE frames include Master ...

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Номер записи: 38
31-01-2019 дата публикации

Systems and methods for synchronizing wireless sensor devices connected to a control panel device via multiple access point devices

Номер: US20190037336A1
Автор: Bin Yang, Hongye Jiang, Kenneth Eskildsen
Принадлежит: Ademco Inc

Systems and methods for synchronizing wireless sensor devices connected to a control panel device via multiple access point devices are provided. Some methods can include a control panel device periodically transmitting a time signal to an access point device, the access point device periodically receiving the time signal from the control panel device and using the time signal to synchronize with the control panel device, the access point device periodically transmitting a wireless beacon that includes a timestamp of the access point device to a sensor device, and the sensor device periodically exiting a sleep mode to receive the wireless beacon from the access point device and using the timestamp to synchronize with the access point device.

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Номер записи: 39
30-01-2020 дата публикации

MEASURE AND IMPROVE CLOCK SYNCHRONIZATION USING COMBINATION OF TRANSPARENT AND BOUNDARY CLOCKS

Номер: US20200036506A1
Автор: Garg Vineet Kumar, Krishna N N V Hari, Tanwar Anshul
Принадлежит:

The present technology improves synchronization of a slave node with a master node in a network using PTP packets in which the slave node is coupled to the working master node through at least one boundary node. The technology establishes a synchronization communication session between the boundary node and the slave node in which the synchronization communication session is configured to measure a first timing delay from the boundary node to the slave node, and establishes a transparent communication session between the master node and the slave node through the boundary timing node in which the transparent communication session configured to measure a second timing delay from the master node to the slave node. Using the sessions, the technology adjusts a timing delay correction factor according to the first timing delay and the second timing delay, and synchronizes the slave node with the master node according to the correction factor. 1. A method for a plurality of slave nodes to select a primary master node from a plurality of master nodes , comprising: measuring a first timing delay from the each slave node to an adjacent boundary node over a synchronization communication session;', 'measuring a second timing delay from the each slave node to each of the master nodes over a transparent communication session;', 'determining the overall offset as the difference between the first and second timing delays; and, 'determining an overall offset between each of the slave nodes and each of the master nodes, comprising for each of the slave nodesselecting, by the slave nodes and based on results of the measuring, the primary master node from the plurality of master nodes.2. The method of claim 1 , further comprising:establishing, for each of the slave nodes, the synchronization communication session between the each of the slave nodes and the adjacent boundary node.3. The method of claim 1 , further comprising claim 1 , for each of the slave nodes claim 1 , the ...

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Номер записи: 40
31-01-2019 дата публикации

LTE SIGNALING IN RF BANDS WITH COMPETING COMMUNICATION SYSTEMS

Номер: US20190037553A1
Автор: Andreoli-Fang Jennifer, Babaei Alireza, Campos Luis Alberto, Hamzeh Belal
Принадлежит:

Systems and methods presented herein provide for an LTE wireless communication system operating in a Radio Frequency (RF) band with a conflicting wireless system. The LTE system includes an eNodeB operable to detect a plurality of UEs in the RF band, to generate LTE frames for downlink communications to the UEs, and to time-divide each LTE frame into a plurality of subframes. The eNodeB is also operable to condense the downlink communications into a first number of the subframes that frees data from a remaining number of the subframes in each LTE frame, and to burst-transmit the first number of the subframes of each LTE frame in the RF band. 1. A Long Term Evolution (LTE) wireless communication system operating in a Radio Frequency (RF) band with a conflicting wireless system , the LTE system comprising:an eNodeB operable to detect a plurality of user equipment (UEs) in the RF band, to generate LTE frames for downlink communications to the UEs, to time-divide each LTE frame into a plurality of subframes, to condense the downlink communications into a first number of the subframes that frees data from a remaining number of the subframes in each LTE frame, and to burst-transmit the first number of the subframes of each LTE frame in the RF band.2. The LTE system of claim 1 , wherein:the eNodeB is further operable to reduce energy transmitted in the RF band during the remaining number of the subframes in each LTE frame to allow transmission by the conflicting wireless system.3. The LTE system of claim 1 , wherein:at least one of the first number of the subframes of the LTE frames comprises a reference signal that assist the UEs with channel estimation and detection.4. The LTE system of claim 1 , wherein:at least one of the first number of the subframes of the LTE frames comprises a control signal that provides synchronization for another eNodeB.5. The LTE system of claim 1 , wherein:at least one of the first number of the subframes of the LTE frames include Master ...

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Номер записи: 41
30-01-2020 дата публикации

WIRELESS AUDIO SYNCHRONIZATION

Номер: US20200037075A1
Автор: Banerjee Debasmit, Elliot Michael William
Принадлежит: Bose Corporation

An audio distribution system includes an audio source; and a plurality of audio playback devices in communication with each other and with the audio source. A group of the audio playback devices are arranged to render audio content provided by the audio source in synchrony. One of the audio playback devices within the group is configured as an audio master which distributes audio content from the audio source to the other audio playback devices within the group, and one of the plurality of audio playback devices, other than the audio master, is configured as a clock master, which distributes clock information that the group of audio playback devices synchronizes to. 1. A system including a plurality of audio playback devices in communication with each other , the system comprising:a first audio playback device of the plurality of audio playback devices, wherein the first audio playback device is configured to distribute audio content to at least one other audio playback device of the plurality of audio playback devices; anda second audio playback device of the plurality of audio playback devices, the second audio playback device different from the first audio playback device, wherein the second audio playback device is configured to distribute clock information to at least one other audio playback device of the plurality of audio playback devices.2. The system of claim 1 , wherein the at least one other audio playback device that is configured to receive audio content from the first audio playback device includes the second audio playback device.3. The system of claim 1 , wherein the at least one other audio playback device that is configured to receive clock information from the second audio playback device includes the first audio playback device.4. The system of claim 1 , wherein the at least one other audio playback device that is configured to receive audio content from the first audio playback device is in a group with the first audio playback device claim 1 , ...

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Номер записи: 42
15-02-2018 дата публикации

CENTRALIZED NETWORKED TOPOLOGY FOR MOTION RELATED CONTROL SYSTEM

Номер: US20180046171A1
Автор: CHIN Shee Jia, DEUTSCH Rachel, KONG Yong Min, SAPIR Eyal
Принадлежит:

A method of arrangement of centralized network motion controller employing centralised topology having a plurality of remote units as system architecture comprising the steps of: (i) providing, using synchronised messages, all system and axes data to a centralized processing unit, wherein the data is updated down to a control sampling rate and all the data items are available from each remote unit, (ii) the centralized processing unit performing system behaviour control and multi axes profiling and motion control such as position, velocity and current, (iii) synchronized messages from the centralized processing unit are used to set the timing and to keep continuous synchronization of all units and to transfer the desired low level commands to the remote unit. 1. A method of arrangement of centralized network motion controller employing centralised topology having a plurality of remote units as system architecture comprising the steps of: (i) providing , using synchronised messages , all system and axes data to a processing unit , wherein the data is updated down to a control sampling rate and all the data items are available from each remote unit , (ii) the centralized processing unit performing behaviour control and multi axes profiling and motion control such as position , velocity and current , (iii) synchronized messages from the centralized processing unit are used to set the timing and to keep continuous synchronization of all units and to transfer the desired low level commands to the remote unit.2. The method of arrangement of centralized network motion controller of claim 1 , wherein the low level commands include desired PWM command.3. The method of arrangement of a centralized network motion controller as set forth in claim 1 , further comprising the step of measuring cables propagation delay and compensating for the delay by configuration of the remote or the master units.4. The method of arrangement of a centralized network motion controller as set ...

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Номер записи: 43
06-02-2020 дата публикации

Method For Monitoring A Network For Anomalies

Номер: US20200044937A1
Автор: GERSTER FLORIAN, Joos Uli, LIEDER LORENZ
Принадлежит:

A method monitors a data transmission network having a plurality of devices connected to one another over fixedly prescribed signal transmission paths, for anomalies. One of the devices is a master device that has a counter and a trigger apparatus, by which a prescribed signal feature of a signal is acquired, and upon the acquisition, a master counter state corresponding thereto is read. The method provides for an evaluation apparatus to determine, under predetermined conditions, a setpoint value of at least one network-specific parameter defined by a physical property of the network, before an actual value of the network-specific parameter is determined from a difference between the master counter state and a further counter state, and an anomaly is indicated if a predetermined deviation criterion between the actual value and the setpoint value is met. 110-. (canceled)11. A method for monitoring a network for anomalies , the network provided for data transmission and having a plurality of devices connected to one another over fixedly prescribed signal transmission paths , which comprises the steps of:assigning one of the devices to be a master device having a counter and a trigger apparatus, and by said master device a prescribed signal feature of a signal transmitted via the network is acquired;reading, upon acquisition of the prescribed signal feature, a master counter state of the counter of the master device, corresponding to a time of the acquisition;determining via an evaluation apparatus, under predetermined anomaly-free conditions, a setpoint value of at least one network-specific parameter defined by a physical property of the network;determining a respective actual value of the at least one network-specific parameter by the evaluation apparatus from a difference between a read master counter state and a further counter state; andindicating an anomaly if a predetermined deviation criterion between the respective actual value and the setpoint value is met. ...

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Номер записи: 44
08-05-2014 дата публикации

INTERFACE CIRCUIT FOR TRANSMITTING AND RECEIVING DIGITAL SIGNALS BETWEEN DEVICES

Номер: US20140126587A1
Автор: Ichimura Gen, Kikuchi Hidekazu, Nakajima Yasuhisa
Принадлежит: SONY CORPORATION

A video signal and an audio signal are TMDS transmitted from a source device to a sink device. Through a reserved line and a HPD line provided separately from a TMDS transmission line, an Ethernet™ signal is bidirectionally transmitted, and also, a SPDIF signal is transmitted from the sink device to the source device. The Ethernet™ signal bidirectionally transmitted between Ethernet™ transmitter/receiver circuits is differentially transmitted by an amplifier and is received by the amplifier. The SPDIF signal from a SPDIF transmitter circuit is common-mode transmitted from an adder and is received by the adder to be supplied to the SPDIF receiver circuit. 1. A transmitting device , comprising:a first transmitting section for transmitting a first signal as a differential signal to an external device through a first transmission line;a second transmitting section for transmitting a second signal, being multiplexed to the first transmission line, as a common-mode signal to the external device;a communication unit for communicating with the external device via a pair of differential transmission lines included in the first transmission line, the communication unit notifying the external device of a connection status of its own device by at least one of direct current bias potentials of the pair of differential transmission lines;a receiver for receiving an audio signal from the external device through a second transmission line; anda reproduction unit for reproducing the audio signal, the reproduction unit silencing, in case an error occurs in the second transmission line, a portion where the error has occurred.2. The transmitting device of claim 1 , wherein the second signal is a signal including a clock component.3. The transmitting device of claim 2 , wherein the second signal includes a biphase-mark modulated signal.4. The transmitting device of claim 1 , wherein the second signal is a SPDIF signal.5. The transmitting device of claim 1 , further comprising receiving ...

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Номер записи: 45
15-02-2018 дата публикации

Time Synchronization Method and System, and Network Device

Номер: US20180049147A1
Автор: Chen Cong, Xu Chuan
Принадлежит:

A time synchronization method and system, and a network device, where the method includes receiving, by a second network device, a first packet from a first network device, where the first packet includes a first service frame and a first time stamp (T), the first service frame carries a system clock of a radio equipment control (REC), obtaining, the system clock of the REC according to the first packet, sending, according to the system clock of the REC, the first service frame extracted from the first packet to a radio equipment (RE), recording a second time stamp (T) at which the first service frame is sent, and determining, by the second network device, a transmission delay (T) according to T=T−T. Hence, a delay between the REC and the RE remains unchanged. 1. A time synchronization method , comprising:{'b': 1', '1, 'receiving, by a second network device, a first packet from a first network device, wherein the first packet comprises a first service frame and a first time stamp (T), wherein the first network device is coupled to a radio equipment control (REC), wherein the second network device is coupled to a radio equipment (RE), wherein the first network device keeps system time synchronization with the second network device, wherein the first service frame is from the REC to the first network device and carries a system clock of the REC, and wherein the T is a time stamp at which the first network device receives the first service frame;'}obtaining, by the second network device, the system clock of the REC according to the first packet;sending, by the second network device according to the system clock of the REC, the first service frame extracted from the first packet to the RE;{'b': '2', 'recording, by the second network device according to a system time of the second network device, a second time stamp (T) at which the first service frame is sent by the second network device; and'}{'b': 2', '1, 'calculating, by the second network device, a transmission ...

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Номер записи: 46
03-03-2022 дата публикации

Robust distribution of ip timing signals

Номер: US20220069932A1
Автор: Benjamin H. KEPLER, Carl A. Brown, Craig L. Beardsley, Jerome G. Liscano, Michael J. Strein, Nishith Shah
Принадлежит: Disney Enterprises Inc

Embodiments disclosed herein provide techniques to selectively distribute Precision Time Protocol (PTP) data in a network. The network can include multiple different network devices (e.g., switches) connected to form a network architecture (e.g., a spine/leaf architecture). Rather than distributing the PTP data (e.g., PTP timestamps) through all the network devices in order to synchronize local clocks to a global, master clock, the embodiments herein describe an out-of-band distribution network which selectively distributes the PTP data to select network devices in the network.

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Номер записи: 47
22-02-2018 дата публикации

DEVICE, METHOD AND SYSTEM FOR DETECTING AND RESOLVING TIME INFORMATION OF DIFFERENT ADMINISTRATIVE DOMAINS

Номер: US20180052485A1
Автор: Falk Rainer, Fischer Kai, Fries Steffen, Klasen Wolfgang
Принадлежит:

A device is provided for detecting time information of different administrative domains. The device includes a plurality of detection units, wherein each detection unit is assigned to one of the administrative domains and is configured to receive time information from a timer of the assigned administrative domains for synchronising with the assigned administrative domains, a storage device having a plurality of storage areas, and a plurality of control units, wherein each control unit is assigned exclusively to one of the detection units and the control units are configured to detect, synchronised with one another, a respective most recent item of the received time information of the respective assigned detection unit and to store the synchronously detected time information of the plurality of detection units together as synchronised data in one of the storage regions. 1. A device for detecting time information of different administrative domains comprising:a plurality of detection units, wherein each detection unit of the plurality of detection units is assigned to one of the administrative domains and is configured to receive time information from a timer of the assigned administrative domain for synchronizing with the assigned administrative domain;a storage device with a plurality of storage areas; anda plurality of control units wherein each control unit of the plurality of control units is assigned to precisely one detection unit of the plurality of detection units, the plurality of control units being configured to detect, synchronously with one another, a respective most recent item of received time information of the respective assigned detection unit and to store the synchronously detected time information of the plurality of detection units together as synchronization data in one of the plurality of storage areas.2. The device as claimed in claim 1 ,whereinthe plurality of control units are configured to detect, at a certain point in time of a reference ...

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Номер записи: 48
23-02-2017 дата публикации

PROVIDING PRECISION TIMING PROTOCOL (PTP) TIMING AND CLOCK SYNCHRONIZATION FOR WIRELESS MULTIMEDIA DEVICES

Номер: US20170055235A1
Автор: Aldana Carlos Horacio, Balasubramanyan Shivakumar, Kafle Padam Lal, Rabii Khosro Mohammad, Shaukat Fawad, Subramaniam Vijay Naicker
Принадлежит:

Providing Precision Timing Protocol (PTP) timing and clock synchronization for wireless multimedia devices is disclosed. In one aspect, a primary wireless multimedia device comprising a timing synchronization control system is provided. The timing synchronization control system is configured to apply a PTP Best-Master-Clock (BMC) algorithm logic to select a master clock from among a system clock of the primary wireless multimedia device, one of one or more connected wireless multimedia devices, or one of one or more external nodes. If the timing synchronization control system selects the system clock of the primary wireless multimedia device, a clock signal of the system clock is provided to the connected wireless multimedia devices as the master clock. If the timing synchronization control system selects a connected wireless multimedia device or an external node as the master clock, the timing synchronization control system synchronizes the system clock with the master clock. 1. A primary wireless multimedia device , comprising:a wireless controller communicatively coupled to an antenna, the wireless controller configured to establish one or more wireless connections with a corresponding one or more connected wireless multimedia devices;a system clock; and apply a Precision Timing Protocol (PTP) Best-Master-Clock (BMC) algorithm logic to select dynamically a master clock from among the system clock, the one or more connected wireless multimedia devices, and one or more external nodes;', 'responsive to selecting the system clock as the master clock, provide a clock signal of the system clock as the master clock to the one or more connected wireless multimedia devices; and', 'responsive to selecting a connected wireless multimedia device of the one or more connected wireless multimedia devices or an external node of the one or more external nodes as the master clock, synchronize the system clock with the master clock., 'a timing synchronization control system coupled ...

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Номер записи: 49
10-03-2022 дата публикации

Communication node and communication system for performing clock synchronization

Номер: US20220078732A1
Автор: Donghee KWON, Hoopyo HONG
Принадлежит: Solid Inc

A communication system comprises a clock generator configured to generate a plurality of system clock signals used to synchronize components included in each of communication nodes in the communication system based on an external clock signal provided by an external clock source located outside the communication system and a physical layer configured to transmit any one of the generated system clock signals to a small cell communicatively connected to an end communication node of the communication system.

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Номер записи: 50
03-03-2016 дата публикации

NODE AND METHOD FOR SELECTING SYNCHRONIZATION SOURCE

Номер: US20160065322A1
Автор: Cao Jin, LIN Rui, Liu Yanxing
Принадлежит:

The disclosure relates to a node capable of selecting a first port to receive a first synchronization source in a system comprising a plurality of nodes. The node comprises a memory configured to memorize states of each port of the node in a corresponding tree. At least one tree is formed with ports of the plurality of connected nodes according to a second synchronization protocol. The node further comprises a first synchronization source selection unit configured to select the first port according to states of the ports of the node. The first synchronization source so selected will not form a loop in the network. There is also provided a method used in the node. 122-. (canceled)23. A node configured to select a first port to receive a first synchronization source in a system comprising a plurality of nodes , the plurality of nodes being connected to each other via ports of the nodes , the first synchronization source being associated with a first synchronization protocol different from a second synchronization protocol used in the system , the node comprising:a memory configured to memorize states of each port of the node in a corresponding tree of at least one tree in the system, said at least one tree being formed with ports of the plurality of connected nodes according to the second synchronization protocol, anda first synchronization source selection unit configured to select the first port to receive the first synchronization source, based on states of the ports of the node.24. The node according to claim 23 , wherein the first synchronization source is a frequency synchronization source.25. The node according to claim 23 , wherein the first synchronization protocol is a packet synchronization related protocol.26. The node according to claim 23 , wherein the second synchronization protocol is a time or phase synchronization related protocol.27. The node according to claim 23 , further comprising:a timing loop detection unit configured to detect a timing loop ...

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Номер записи: 51
20-02-2020 дата публикации

APPARATUS AND MECHANISM TO SUPPORT MULTIPLE TIME DOMAINS IN A SINGLE SOC FOR TIME SENSITIVE NETWORK

Номер: US20200059311A1
Автор: Beaudoin Denis, Hansen Eric, Hu Chunhua, Kowkutla Venkateswar Reddy, Leyrer Thomas Anton
Принадлежит:

A system on a chip (SOC) is configured to support multiple time domains within a time-sensitive networking (TSN) environment. TSN extends Ethernet networks to support a deterministic and high-availability communication on Layer 2 (data link layer of open system interconnect “OSI” model) for time coordinated capabilities such as industrial automation and control applications. Processors in a system may have an application time domain separate from the communication time domain. In addition, each type time domain may also have multiple potential time masters to drive synchronization for fault tolerance. The SoC supports multiple time domains driven by different time masters and graceful time master switching. Timing masters may be switched at run-time in case of a failure in the system. Software drives the SoC to establish communication paths through a sync router to facilitate communication between time providers and time consumers. Multiple time sources are supported. 1. A system on a chip (SoC) integrated circuit (IC) , comprising:one or more registers;a plurality of programmable logic gates configured to provide a configurable communication path, between a first selected input of a plurality of inputs and a first selected output of a plurality of outputs, based on a value stored in the one or more registers;at least a first of the plurality of inputs configured for being communicably coupled to a first time source;at least a second of the plurality of inputs configured for being communicably coupled to a second time source;a first subset of the plurality of outputs configurable to provide first timing information determined from the first time source; anda second subset of the plurality of outputs configurable to provide second timing information determined from the second time source,wherein the first selected input is configured to represent information pertaining to a first timing master, the first selected output is configurable to provide timing information ...

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Номер записи: 52
01-03-2018 дата публикации

Bi-directional transceiver with time synchronization

Номер: US20180062825A1
Автор: Huade Shu, Leo Yu-Yu Lin, Puhui MIAO
Принадлежит: Finisar Corp

A system or a network may include an optoelectronic module that includes an optical transmitter optically coupled with an optical fiber, and a controller communicatively coupled to the optical transmitter. The controller may be configured to operate the optical transmitter to transmit data signals through the optical fiber. The optoelectronic module may be configured to transmit time synchronization signals through the optical fiber along with the data signals.

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Номер записи: 53
02-03-2017 дата публикации

Time Distribution Switch

Номер: US20170063482A1
Автор: Achanta Shankar V., Loehner Henry, Whitehead David E.
Принадлежит:

Systems and methods for detecting the failure of a precision time source using an independent time source are disclosed. Additionally, detecting the failure of a GNSS based precision time source based on a calculated location of a GNSS receiver is disclosed. Moreover, the system may be further configured to distribute a time derived from the precision time source as a precision time reference to time dependent devices. In the event of a failure of the precision time source, the system may be configured to distribute a time derived from a second precision time source as the precision time signal during a holdover period. 120-. (canceled)21. A time distribution device comprising:a receiver configured to receive periodic time signals from each of first and second external time sources;an output configured to provide a precision time signal to an intelligent electronic device (IED), wherein the precision time signal is determined from a best available time source of the first and second external time sources; determine, for the first external time source, a first variation of duration between the periodic time signals from the first external time source, the first variation in duration based on a local oscillator;', 'determine, for the second external time source, a second variation of duration between the periodic time signals from the second external time source, the second variation in duration based on the local oscillator;', 'compare the first variation and the second variation; and', 'select the best available time source as one of the first time source and the second time source with the lowest variation., 'a time quality module configured to22. The time distribution device of claim 21 , wherein the local oscillator comprises an internal oscillator.23. The time distribution device of claim 21 , wherein the time quality module is further configured to:detect a failure of the selected precision time source; anddetermine a backup precision time source for use as the ...

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Номер записи: 54
04-03-2021 дата публикации

SYSTEMS AND METHODS TO IMPROVE HOLDOVER PERFORMANCE IN R-PHY NETWORK ARCHITECTURES

Номер: US20210067260A1
Автор: Neugeboren Yair
Принадлежит:

Systems and methods for regaining synchronization between a CMTS core and an RPD, where both the core and the RPD are configured for individual synchronization in a slave configuration to a common grandmaster clock. 1. A system comprising:a CMTS core having a first slave clock configured to be synchronized with a grandmaster timer;an RPD having a second slave clock configured to be synchronized with the grandmaster timer; whereat least one of the core and the RPD is configured to regain phase synchronization with the grandmaster timer, after losing synchronization with the grandmaster timer, by automatically and selectively implementing a phase step relative to the grandmaster, selection based on timing data exchanged between the core and the RPD.2. The system of where the RPD is configured to regain synchronization with the grandmaster timer claim 1 , after losing synchronization with the grandmaster timer claim 1 , based on timing data exchanged between the core and the RPD.3. The system of where the RPD is configured to regain synchronization with the grandmaster timer claim 1 , after losing synchronization with the grandmaster timer claim 1 , based on timing data exchanged between the core and the RPD.4. The system of where synchronization is regained with the grandmaster timer by a gradual change in a frequency difference relative to the grandmaster timer over a period of time when the phase step is not selected.5. The system of where selection is based on at least one of: (a) the core's measured offset from the grandmaster; (b) the RPD's measured offset from the grandmaster; (c) a respective state of at least one cable modem connected to the RPD; and (d) claim 4 , a the currently configured MAP advance time from the core to the RPD.6. The system of where the core changes its MAP advance time to the RPD based on a message from the RPD.7. The system of in an R-PHY architecture.8. A method used in an R-PHY architecture to recover synchronization between a CMTS ...

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Номер записи: 55
12-03-2015 дата публикации

System And Method For Monitoring Network Synchronization

Номер: US20150071308A1
Автор: III Charles A., Karnes Joshua D., Mackenzie Simon A., Nutt Jason C., Webb
Принадлежит: Anue Systems, Inc.

Systems and methods are disclosed for monitoring network synchronization. The disclosed embodiments utilize time window snapshots to capture network time information and compare the captured time information against time reference information to determine network time errors. These network time errors can then be analyzed with respect to selected operating parameters and tolerances to determine network synchronization errors and to generate alarms. Certain embodiments are configured to capture time information data and to analyze this captured data locally to determine time error data. Certain other embodiments are configured to utilize multiple capture devices and to transmit time error data to a central snapshot synchronization monitor. The central snapshot synchronization monitor can also communicate control information to the capture devices to control the snapshot time windows. In addition, synchronization errors can be used as trigger events to cause additional capture of time information by other capture devices. 1. A method for monitoring network synchronization , comprising:capturing time information for a first time period associated with a network being monitored;comparing the captured time information for the first time period to time reference information to determine a first synchronization metric for the first time period;analyzing the first synchronization metric with respect to a second synchronization metric to determine if a synchronization error is present with respect to the network being monitored; andoutputting a synchronization error alarm if a synchronization error is determined to be present.2. The method of claim 1 , wherein the capturing step during the first time period comprises:capturing packets associated with a packet flow within the network being monitored;recording time stamps associated with arrival times for the captured packets, the time stamps providing the time reference information for the comparing step; andanalyzing the ...

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Номер записи: 56
27-02-2020 дата публикации

TIME-DIVISION MULTIPLEXING FOR 5G NETWORK COVERAGE EXTENSION

Номер: US20200068414A1
Автор: Abdel Shahid Wafik, Karimli Yasmin, Kwok Ming Shan, LAN Wei-Ming, Lucht Thomas P.
Принадлежит:

Techniques for time-division multiplexing for extending 5Generation (5G) network coverage are described herein. In an example, a device operating in a dual transmission mode for transmitting data via a first network node associated with a 5G network and a second network node associated with a 4Generation (4G) network at or near a same time, can determine a measurement associated with a transmission and/or receiving characteristic. The device can determine that the measurement meets or exceeds a threshold and, based at least in part on determining that the measurement meets or exceeds the threshold, the device can transition to an alternating transmission mode for transmitting data via the first network node and the second network node in an alternating pattern thereby extending 5G network coverage. 1. A device comprising:one or more transceivers for transmitting and receiving data via a first network node associated with a 4th generation (4G) network and a second network node associated with a 5th generation (5G) network;one or more processors;a memory; and determining, in a dual transmission mode for transmitting data via the one or more transceivers to the first network node and the second network node at or near a same time, a measurement of a characteristic associated with transmitting or receiving data;', 'determining that the measurement meets or exceeds a threshold;', 'based at least in part on determining that the measurement meets or exceeds the threshold, transitioning to an alternating transmission mode;', 'sending, in the alternating transmission mode and at a first time, a first scheduling request to the first network node;', 'sending, in the alternating transmission mode and at a second time, a second scheduling request to the second network node; and', 'transmitting, in the alternating transmission mode, one or more data items to the first network node and the second network node based at least in part on instructions received responsive to the first ...

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Номер записи: 57
11-03-2021 дата публикации

Measure and improve clock synchronization using combination of transparent and boundary clocks

Номер: US20210075585A1
Автор: Anshul Tanwar, N V Hari Krishna N, Vineet Kumar Garg
Принадлежит: Cisco Technology Inc

The present technology improves synchronization of a slave node with a master node in a network using PTP packets in which the slave node is coupled to the working master node through at least one boundary node. The technology establishes a synchronization communication session between the boundary node and the slave node in which the synchronization communication session is configured to measure a first timing delay from the boundary node to the slave node, and establishes a transparent communication session between the master node and the slave node through the boundary timing node in which the transparent communication session configured to measure a second timing delay from the master node to the slave node. Using the sessions, the technology adjusts a timing delay correction factor according to the first timing delay and the second timing delay, and synchronizes the slave node with the master node according to the correction factor.

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Номер записи: 58
24-03-2022 дата публикации

Playback Devie

Номер: US20220091814A1
Автор: Millington Nicholas A.J.
Принадлежит:

A system is described for maintaining synchrony of operations among a plurality of devices that have independent clocking arrangements. The system includes a task distribution device that distributes tasks to a synchrony group comprising a plurality of devices that are to perform the tasks distributed by the task distribution device in synchrony. The task distribution device distributes each task to the members of the synchrony group over a network. Each task is associated with a time stamp that indicates a time, relative to a clock maintained by the task distribution device, at which the members of the synchrony group are to execute the task. Each member of the synchrony group periodically obtains from the task distribution device an indication of the current time indicated by its clock, determines a time differential between the task distribution device's clock and its respective clock and determines therefrom a time at which, according to its respective clock, the time stamp indicates that it is to execute the task. 1. A first data network device comprising:one or more processors; andtangible, non-transitory computer-readable media comprising program instructions that are executable by the one or more processors such that the first data network device is configured to:receive control information from a second data network device over an asynchronous data network configured to exchange digital data packets, wherein the received control information comprises a direction for the first data network device to enter into a synchrony group with at least a third data network device; and wherein in the synchrony group, the first data network device and the third data network device are configured to playback audio in synchrony based at least in part on (i) audio content, (ii) playback timing information associated with the audio content, wherein the playback timing information is generated by one of the first data network device or the third data network device, and (iii) ...

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Номер записи: 59
07-03-2019 дата публикации

SYSTEMS AND METHODS FOR PROVIDING RESILIENCE TO LTE SIGNALING INTERFERENCE IN WIFI

Номер: US20190074927A1
Автор: Andreoli-Fang Jennifer, Babaei Alireza, Pang Yimin
Принадлежит:

Systems and methods presented herein enhance WiFi communications in a RF band where conflicting LTE signaling exists. In one embodiment, a system includes a processor operable to detect the WiFi communications between a UE and a wireless access point of a WiFi network, to identify errors in the WiFi communications, and to determine a periodicity of the errors based on the LTE signaling structure. The system also includes an encoder communicatively coupled to the processor and operable to encode the WiFi communications with error correction, and to change the error correction based on the periodicity of the errors in the WiFi communications. 1. A system for processing WiFi communications in a Radio Frequency (RF) band with conflicting Long Term Evolution (LTE) signaling , the system comprising:a processor operable to detect the WiFi communications between a user equipment (UE) and a wireless access point of a WiFi network, to identify errors in the WiFi communications, and to determine a periodicity of the errors based on an LTE signaling structure; anda decoder communicatively coupled to the processor, wherein the decoder is operable to decode the WiFi communications according to the periodicity of the errors in the WiFi communications.2. The system of claim 1 , wherein:the decoder is further operable to change error correction according to the periodicity of the errors in the WiFi communications, and to decode the WiFi communications with the changing error correction.3. The system of claim 2 , wherein the decoder is further operable to change error correction by:increasing an error correction rate of error correction coding when the errors occur; anddecreasing the error correction rate of the error correction coding when the errors subside.4. The system of claim 2 , wherein the decoder is further operable to change the error correction by:predicting when the errors will occur in the WiFi communications;determining that all bits during that time are in error; ...

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Номер записи: 60
16-03-2017 дата публикации

Clock synchronization management device, control method and computer program product

Номер: US20170078038A1
Автор: Keiji Yamamoto, Kohta Nakamura, Masashi Ishida, Taichi Tashiro
Принадлежит: Toshiba Corp

According to an embodiment, a clock synchronization management device includes an accuracy evaluation unit and a network formation unit. The accuracy evaluation unit evaluates the accuracy of a clock for synchronization with respect to each of devices constituting a decentralization system and classifies each of the devices into a plurality of divisions based on whether each of the devices is capable of supplying at least the clock for synchronization to another device. The network formation unit identifies a device capable of supplying the clock for synchronization based on a classification by the accuracy evaluation unit and causes a device incapable of supplying the clock for synchronization to another device to synchronize with the identified device.

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Номер записи: 61
16-03-2017 дата публикации

METHOD AND APPARATUS FOR NETWORK SYNCHRONIZATION, COMPUTER PROGRAM PRODUCT FOR PERFORMING THE METHOD AND SYSTEM COMPRISING THE APPARATUS

Номер: US20170078985A1
Автор: Hooli Kari Juhani, MOU Jianhong, Zheng Naizheng
Принадлежит:

A method for network synchronization of a first network element is provided, comprising: receiving, from each of at least two synchronization candidate network elements, a first synchronization accuracy value; determining, for each of the at least two synchronization candidate network elements, a signal quality indicator; determining for each synchronization candidate network element a second synchronization accuracy value based on the signal quality indicator and the first synchronization accuracy value related to the synchronization candidate network element, and selecting a synchronizing network work element, for synchronizing the first network element to, from the at least two synchronization candidate network elements, based on the determined second synchronization accuracy values. The present disclosure enhances the performance of RIB network synchronization by indicating an estimate of an accumulated synchronization error magnitude. The indication is beneficial for RIB source network element or source cell selection and it could help to make the topology of synchronized network elements/cells more reasonable. 136-. (canceled)37. A method for network synchronization of a first network element , comprising:receiving, from each of at least two synchronization candidate network elements, a first synchronization accuracy value;determining, for each of the at least two synchronization candidate network elements, a signal quality indicator;determining for each synchronization candidate network element a second synchronization accuracy value based on the signal quality indicator and the first synchronization accuracy value related to the synchronization candidate network element, andselecting a synchronizing network element, for synchronizing the first network element to, from the at least two synchronization candidate network elements, based on the determined second synchronization accuracy values.38. The method according to claim 37 , wherein the first ...

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Номер записи: 62
18-03-2021 дата публикации

SIMPLIFIED SYNCHRONIZED ETHERNET IMPLEMENTATION

Номер: US20210083788A1
Автор: Robitaille Claude, Rochon Steve, Viens Yanick
Принадлежит:

A method of simplifying the implementation of Synchronous Ethernet on an Ethernet device having a first port and a second port device using a predetermined protocol and signaling, comprises delivering a master clock from a Synchronous Ethernet system to the first port of the Ethernet device; transmitting the delivered master clock to the second port of the Ethernet device independently of the protocol and signaling of the Ethernet device; and transmitting the master clock from the second port of the Ethernet device to a downstream device that supports Synchronous Ethernet. In one implementation, the Ethernet device has a local clock, and the method synchronizes the local clock to the master clock. In another implementation, the Ethernet device does not have a local clock, and the master clock is transmitted from the second port of the Ethernet device to the downstream device without any synchronizing operation at the Ethernet device. 1. A first synchronous ethernet device coupled to a second and third synchronous ethernet devices via a network , comprising:a master clock received at a first synchronous ethernet device;the master clock is re-transmitted to a second synchronous ethernet device,whether or not said second synchronous ethernet device maintains a local clock synchronized.2. The device of further comprising when the master clock is received at the first synchronous ethernet device:the master clock is transmitted from the first port to the third synchronous ethernet device.3. The device of in which said first ethernet device does not have a local clock claim 1 , and said master clock is transmitted to said second or third synchronous device without any synchronizing operation at said first synchronous ethernet device.4. The device of in which at least one of said first ethernet device is configured to recognize that the master clock has been received.5. The device of claim 1 , wherein a first and second state machines are the same on both of said first and ...

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Номер записи: 63
23-03-2017 дата публикации

FASTER SYNCHRONIZATION TIME AND BETTER MASTER SELECTION BASED ON DYNAMIC ACCURACY INFORMATION IN A NETWORK OF IEEE 1588 CLOCKS

Номер: US20170085330A1
Автор: Leighton Ian, Roberts Peter, Wong Kin-Yee
Принадлежит:

A method and system are provided for synchronizing local clocks more quickly in a telecommunication network using IEEE 1588. A network element that receives timing signals from one or more possible parent clocks considers a measure of the reliability of the timing signals contained in Announce messages from the parent clock or clocks. The clock uses this reliability information in selecting one of the possible parent clock or clocks to use as the actual parent clock. Once the selection is made, the clock adjusts the filtering characteristics applied to timing signals received from the selected parent clock. The adjustments reflect how confident the parent clock is as to how stable the timing information it provides has become. If the indication of reliability contained in Announce messages received from the parent clock indicates that the timing information is not very reliable, then a high filter bandwidth is used in filtering the timing signals. If the indication of reliability contained in Announce messages indicates that the timing information is reliable, such as by crossing a threshold, then the clock shifts to a normal low bandwidth filtering. By using reliability information in the Announce messages, clocks can better make selections as to which parent clock to use, and can use the reliability information to more quickly synchronize themselves with a grandmaster clock. 1. A method of selecting a parent clock of a local clock in a telecommunication network which uses IEEE 1588 messages to convey timing information , the method comprising:determining reliability of timing information of at least one possible parent clock, an indication of the reliability of timing information contained in Announce messages received from the respective possible parent clock; andselecting one of the possible at least one parent clock using at least the reliability of timing information of the at least one possible parent clock.2. The method of claim 1 , wherein selecting one of ...

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Номер записи: 64
31-03-2022 дата публикации

Multi-Protocol Synchronization

Номер: US20220103279A1
Автор: Alessandro Angeli
Принадлежит: Apple Inc

Techniques are disclosed relating to maintaining a first reference clock for a first local area network (LAN). The first reference clock is usable by a first set of computing devices coupled to the first LAN to participate in a shared experience with a second set of computing devices coupled to a second LAN. A computing system synchronizes, via a first time synchronization protocol, the first reference clock with a global reference clock accessible to the computing system over a wide area network (WAN). The computing system provides, via a second time synchronization protocol, a time value of the first reference clock to one of the first set of computing devices to coordinate an event in the shared experience with one of the second set of computing devices, where the second time synchronization protocol has a precision that is greater than a precision of the first time synchronization protocol.

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Номер записи: 65
05-05-2022 дата публикации

Packet Processing Method and Network Device

Номер: US20220140929A1
Автор: Chen Liqing, NIU Hongwei, Qi Yunlei, Wang Jinhui
Принадлежит:

A packet processing method includes receiving a first packet by a first receiving interface of a media conversion module of a first network device, where the first packet includes a first alignment marker (AM), sending a second packet by a first sending interface of the media conversion module, where the second packet includes the first AM, and where the second packet is the first packet processed by the media conversion module, and calculating a time interval Tbetween a time at which the media conversion module receives the first packet and a time at which the media conversion module sends the second packet, where the Tis used to compensate for a first timestamp at which the first network device receives or sends the third packet.

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Номер записи: 66
06-04-2017 дата публикации

Enhanced console assisted recovery for a coordinated timing network

Номер: US20170097874A1
Автор: Donald Crabtree, John S. Houston, Stephen P. Cherniak
Принадлежит: International Business Machines Corp

An enhanced console assisted recovery capability provides an efficient technique for communicating the failure of a primary time server to the backup time server in order to provide fast failure recovery of a synchronized timing network with the intent of avoiding a complete network outage. The primary time server efficiently notifies the backup time server that the primary time server is about to become unavailable. The backup time server can then begin an immediate takeover of time serving to the synchronized network.

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Номер записи: 67
05-04-2018 дата публикации

SYNCHRONIZATION APPARATUS, SYNCHRONIZATION SYSTEM, RADIO COMMUNICATION APPARATUS AND SYNCHRONIZATION METHOD

Номер: US20180097610A1
Автор: OGAWA Takatoshi
Принадлежит: NEC Corporation

A synchronization apparatus, a synchronization system, a radio communication apparatus, and a synchronization method capable of reducing the effect of the fluctuations in synchronization signals that arc caused when the synchronization signals arc received through a network are provided. A synchronization apparatus () according to the present invention receives a synchronization signal transmitted from a synchronization signal source () through a network. The synchronization apparatus () includes a frequency synchronization unit () that performs frequency synchronization based on a received synchronization signal, and outputs a frequency synchronization signal, a phase synchronization unit () that performs phase synchronization based on a synchronization signal transmitted from the synchronization signal source () through a network, and outputs a phase synchronization signal, and a phase synchronization control unit () that generates an offset value by using a phase difference between the frequency synchronization signal and the phase synchronization signal, and corrects a phase of the frequency synchronization signal by using the offset value. 1. A synchronization apparatus comprising:at least one memory storing instructions, andat least one processor configured to execute the instructions to:perform frequency synchronization based on a first synchronization signal received through a network,output a frequency synchronization signal,perform phase synchronization based on a second synchronization signal received through a network,output a phase synchronization signal, andgenerate an output frequency synchronization signal by using the frequency synchronization signal and the phase synchronization signal.2. A synchronization method comprising:performing frequency synchronization based on a first synchronization signal received through network,outputting a frequency synchronization signal;performing phase synchronization based on a second synchronization signal ...

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Номер записи: 68
06-04-2017 дата публикации

Encoded Audio Synchronization

Номер: US20170098466A1
Автор: Banerjee Debasmit, Elliot Michael W., Sundaresan Rameshwar
Принадлежит:

A method of synchronizing playback of audio over a plurality of wireless speaker packages that are each adapted to play audio, where the audio comprises a plurality of frames of encoded audio data. The method includes determining an offset time of a frame of encoded audio data, where the offset time corresponds to the time when the frame playback is to begin, and inserting the determined offset time into the frame of encoded audio data. 1. A method of synchronizing playback of audio over a plurality of wireless speaker packages that are each adapted to play audio , where the audio comprises a plurality of frames of encoded audio data , and wherein one of the plurality of wireless speaker packages is a master playback device that receives encoded audio data from an audio source and distributes the encoded audio data to the rest of the plurality of wireless speaker packages , which function as slave playback devices , the method comprising:determining an offset time of a frame of encoded audio data, where the offset time corresponds to the time when the frame playback is to begin; andinserting the determined offset time into the frame of encoded audio data.2. The method of wherein the offset times of a plurality of frames of encoded audio data is determined.3. The method of wherein each of the wireless speaker packages comprises an encoded data buffer that stores frames of encoded audio data.4. The method of wherein at least some of the frames stored in the encoded data buffer of the master playback device further comprise the inserted determined offset times of the respective frames.5. The method of wherein at least some of the frames stored in the encoded data buffer of the master playback device comprise frame headers claim 4 , and the determined offset times of the respective frames are inserted into the frame headers.6. The method of wherein at least some of the frames that are stored in the encoded data buffer of the master playback device with the inserted ...

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Номер записи: 69
16-04-2015 дата публикации

Method and apparatus for utilizing a second receiver to establish time and frequency

Номер: US20150105065A1
Автор: Edwin C. Park, YAN Hui
Принадлежит: Airhop Communications Inc

Apparatus and methods for synchronizing a network element (e.g. access points, femtocells, etc.) to a master network (such as a cellular network) to provide accurate frequency and/or time references for their internal systems. In one embodiment, the network element utilizes a dedicated receiver (or transceiver) to receive timing information from the master network. The implementation of the dedicated receiver is advantageous for cost and simplicity reasons. Furthermore, the timing or frequency information, as received from the master network, is used to correct the network element's internal timing. In addition, the network element's internal timing can operate in open-loop mode, if no master network can be found, thereby allowing for the device to continue providing service to network users. Additionally, a dedicated receiver can also receive information (e.g. location, SID, NID, SSID, etc.) local to the network element, such information may be useful or required for seamless operation within the master network.

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Номер записи: 70
08-04-2021 дата публикации

TIME SYNCHRONIZATION SYSTEM AND TRANSMISSION APPARATUS

Номер: US20210103059A1
Автор: Shinohara Takahiro
Принадлежит:

A system capable of achieving time synchronization among a plurality of apparatuses provided at positions where they are unable to receive a GNSS signal is provided. A time synchronization system includes a reference time obtaining unit configured to obtain, based on a radio signal from a global navigation satellite system, a first timing signal and time information corresponding to timing indicated by the first timing signal, a modulator, connected to a line branched into a plurality of branches, configured to generate a modulated signal containing corresponding time information in synchronization with the first timing signal and to send the modulated signal over the line, at least one demodulator, connected to any branch of the line, configured to demodulate the modulated signal propagating over the line, and at least one transmitter configured to transmit a first radio signal compatible with the radio signal from the global navigation satellite system. 1. A time synchronization system comprising:a reference time obtaining unit configured to obtain, based on a radio signal from a global navigation satellite system, a first timing signal and time information corresponding to timing indicated by the first timing signal;a modulator, connected to a line branched into a plurality of branches, configured to generate a modulated signal containing corresponding time information in synchronization with the first timing signal and to send the modulated signal over the line;at least one demodulator, connected to any branch of the line, configured to demodulate the modulated signal propagating over the line; andat least one transmitter configured to transmit a first radio signal compatible with the radio signal from the global navigation satellite system based on a second timing signal and the time information obtained through demodulation by any demodulator.2. The time synchronization system according to claim 1 , whereinthe first timing signal is periodically output,the ...

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Номер записи: 71
02-06-2022 дата публикации

METHOD FOR IMPLEMENTING TIME SYNCHRONIZATION AND RELATED DEVICE

Номер: US20220174625A1
Автор: Xiong Chunshan
Принадлежит: TENCENT TECHNOLOGY (SHENZHEN) COMPANY LIMITED

Time synchronization between communication devices may be necessary for proper communications. The time synchronization may include determining a first target Session Management Function of a first terminal based on first target Single Network Slice Selection Assistance Information, a first target Data Network Name, first identity information, and first type indication information of a first time-sensitive network grandmaster clock by using a Network Repository Function. A first target label information may be obtained from a Unified Data Manager based on the first target Single Network Slice Selection Assistance Information, the first target Data Network Name, the first identity information, and the first type indication information of the first time-sensitive network grandmaster clock. 1. A method for implementing time synchronization , performed by an electronic device , the method comprising:receiving a first request transmitted by a first terminal, the first terminal being connected to a first time-sensitive network grandmaster clock in a first time-sensitive network time domain, the first request comprising target Single Network Slice Selection Assistance Information, a target Data Network Name, first identity information of the first time-sensitive network time domain, first type indication information of the first time-sensitive network grandmaster clock, a first Protocol Data Unit session identity, and a first Protocol Data Unit session request information element;determining a first target Session Management Function of the first terminal based on the target Single Network Slice Selection Assistance Information, the target Data Network Name, the first identity information, and the first type indication information of the first time-sensitive network grandmaster clock by using a Network Repository Function;transmitting the target Single Network Slice Selection Assistance Information, the target Data Network Name, the first identity information, the first ...

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Номер записи: 72
11-04-2019 дата публикации

NON-DISRUPTIVELY SPLITTING A COORDINATED TIMING NETWORK

Номер: US20190109763A1
Автор: Crabtree Donald, Houston John S.
Принадлежит:

A coordinated timing network is dynamically split into a plurality of coordinated timing networks. This split occurs without taking down any of the servers. Each coordinated timing network has its own coordinated timing network identifier (CTN ID), and its own primary time server. Optionally, each coordinated timing network includes a backup time server and an arbiter. 1. A computer program product for managing coordinated timing networks , the computer program product comprising: determining that a coordinated timing network (CTN) is to be split into a plurality of coordinated timing networks, the coordinated timing network including a plurality of servers; and', 'based on determining that the coordinated timing network is to be split, splitting the coordinated timing network into the plurality of coordinated timing networks, wherein the splitting is performed non-disruptively in that servers of the coordinated timing network continue processing during the splitting., 'a computer readable storage medium readable by a processing circuit and storing instructions for performing a method comprising2. The computer program product of claim 1 , wherein the plurality of coordinated timing networks comprises one coordinated timing network and another coordinated timing network claim 1 , and wherein the one coordinated timing network comprises one set of servers of the plurality of servers and the other coordinated timing network comprises another set of servers of the plurality of servers.3. The computer program product of claim 2 , wherein the splitting comprises:providing a new CTN identifier to the other set of servers to be included in the other coordinated timing network; andproviding a new configuration to the plurality of servers in the coordinated timing network, the new configuration employed to indicate which servers of the CTN are to be a part of the one set of servers and which servers of the CTN are to be a part of the other set of servers.4. The computer ...

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Номер записи: 73
09-04-2020 дата публикации

BASE STATION APPARATUS, GROUND STATION DEVICE, AND GROUND ANTENNA DEVICE

Номер: US20200112372A1
Автор: HARAGUCHI Eisuke, Nishimoto Hiroshi, NISHITANI Takashi
Принадлежит: Mitsubishi Electric Corporation

A base station apparatus includes a ground station device and a plurality of ground antenna devices coupled to the ground station device via an optical transmission path. The ground station device performs electrical-optical conversion on an analog electrical signal to be transmitted to a mobile station and a reference clock signal to generate optical signals, performs wavelength division multiplexing on the obtained optical signals to generate a multiplexed optical signal, and outputs the multiplexed optical signal to the optical transmission path. Each of the plurality of ground antenna devices demultiplexes the multiplexed optical signal input from the optical transmission path into demultiplexed optical signals, performs optical-electrical conversion on the demultiplexed optical signals to generate electrical signals, up-converts a frequency of the analog electrical signal obtained through the optical-electrical conversion based on the reference clock signal obtained through the optical-electrical conversion to generate an up-converted signal, and transmits the up-converted signal to the mobile station. 15-. (canceled)6. A base station apparatus comprising:a ground station device; anda plurality of ground antenna devices coupled to the ground station device via an optical transmission path, whereinthe ground station device performs electrical-optical conversion on an analog electrical signal to be transmitted to a mobile station and a reference clock signal to generate optical signals, performs wavelength division multiplexing on the obtained optical signals to generate a multiplexed optical signal, and outputs the multiplexed optical signal to the optical transmission path, andeach of the plurality of ground antenna devices demultiplexes the multiplexed optical signal input from the optical transmission path into demultiplexed optical signals, performs optical-electrical conversion on the demultiplexed optical signals to generate electrical signals, up-converts ...

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Номер записи: 74
09-04-2020 дата публикации

DEVICES, SYSTEMS AND METHODS FOR SYNCHRONIZING EVENT WINDOWS IN WIRELESS NETWORK

Номер: US20200112934A1
Автор: Kondareddy Raghunatha
Принадлежит: CYPRESS SEMICONDUCTOR CORPORATION

A method can include receiving a timing signal that is part of a first communication protocol; by operation of a master device operating according to a second communication protocol, determining event timing windows for a plurality of slave devices of the master device; and by operation of the master device, transmitting control packets to the slave devices, adjusting clock values in the slave devices to sequentially order the event timing windows within an event group window; wherein the event window is timed according to the timing signal. Related devices and systems are also disclosed. 1. A method , comprising:receiving, in a master device, a timing signal that is part of a first communication protocol;by operation of the master device operating according to a second communication protocol, determining initial positions of event timing windows according to the second communication protocol for a plurality of slave devices of the master device; andby operation of the master device, transmitting control packets to the slave devices, adjusting clock values in the slave devices to move at least one event timing window from its initial position to sequentially order the event timing windows within an event group window; whereinthe event group window for the event timing windows according to the second communication protocol is timed according to the timing signal of the first communication protocol.2. The method of claim 1 , wherein:{'b': 1', '3', '11, 'each event timing window has a duration t, the number of slave devices is N, and the event group window has a duration no greater than N.'}3. The method of claim 1 , wherein:receiving the timing signal includes receiving the timing signal from first communication circuits formed on a combination device that operate according to the first communication protocol;the master device is formed in the combination device; andthe first and second communication protocols share a transmission medium, the transmission medium being ...

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Номер записи: 75
04-05-2017 дата публикации

ETHERNET-BASED COMMUNICATION SYSTEM

Номер: US20170126344A1
Автор: PARK Bum Soo
Принадлежит: SOLiD SYSTEMS, INC.

An ethernet-based communication system is provided. The communication system comprises: a first unit configured to generate a reference clock signal by using an input first ethernet signal, multiplex the first ethernet signal and a second ethernet signal in response to the reference clock signal, and output the multiplexed ethernet signals; a second unit configured to generate the reference clock signal by using the multiplexed ethernet signals, separate the second ethernet signal from the multiplexed ethernet signals in response to the reference clock signal, and output the first ethernet signal; and a transmission medium for connecting the first and second units and transmitting the multiplexed ethernet signals from the first unit to the second unit. 1. A communication system comprising:a first unit configured to generate a reference clock signal by using an input first ethernet signal, multiplex the first ethernet signal and a second ethernet signal in response to the reference clock signal, and output the multiplexed ethernet signals;a second unit configured to generate the reference clock signal by using the multiplexed ethernet signals, separate the second ethernet signal from the multiplexed ethernet signals in response to the reference clock signal, and output the first ethernet signal; anda transmission medium for connecting the first and second units and transmitting the multiplexed ethernet signals from the first unit to the second unit.2. The communication system of claim 1 , whereinthe first ethernet signal has a first transmission rate in gigabits per second, andthe second ethernet signal has a second transmission rate in megabits per second.3. The communication system of claim 2 , wherein the first unit comprises:a first restorer configured to restore a clock signal using the first ethernet signal;a first serializer/deserializer configured to parallelize the first ethernet signal with first internal signals having the second transmission rate and ...

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Номер записи: 76
12-05-2016 дата публикации

Distributed ROUTING CONTROL in a Vast Communication Network

Номер: US20160134524A1
Автор: Beshai Maged E.
Принадлежит:

Multiple network controllers are interconnected in a full mesh structure, e.g., through a cyclical cross connector, to form a distributed control system for a network of a large number of nodes. A network controller acquires characterizing information of links emanating from a respective set of nodes, communicates the information to each other network controller, and determines a route set from each node of the respective set of nodes to each other node of the network. The network controller may determine, for each link included in the route set, identifiers of specific route sets which traverse the link. Accordingly, a state-change of any link in the network can be expeditiously communicated to network controllers to take corrective actions where necessary. A network controller may rank routes of a route set according to some criterion to facilitate selection of a favourable available route for a connection. 1. A method of distributed control of a network having a plurality of nodes interconnected by a plurality of links , the method comprising:coupling each network controller of a set of hardware network controllers to a respective node, said each network controller comprising a respective processor;configuring said each network controller to receive characterizing information of respective links emanating from a respective set of nodes;interconnecting said hardware network controllers through a cross connector; sending to each other network controller of said set of hardware network controllers through said cross connector characterizing information of said respective links;', 'receiving characterizing information of links emanating from nodes coupled to other network controllers of said set of hardware network controllers; and', 'determining a route set from each node of said respective set of nodes to each other node of said plurality of nodes., 'performing at said each network controller processes of2. The method of wherein said coupling comprises connecting ...

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Номер записи: 77
10-05-2018 дата публикации

Synchronization Method, Controller, Synchronization Node, Synchronous Network, and Storage Medium

Номер: US20180131459A1
Автор: HE Li, Wang Bin, Wen Lin, Zhang Junhui, ZHAO Hongguang
Принадлежит:

The present document discloses a synchronization method, herein the method includes a controller determining synchronization link topology information according to physical link topology information of the synchronous network and synchronization information of a synchronous node in the synchronous network; the controller generating a synchronization rule of the synchronous node according to the synchronization link topology information; and the controller transmitting the synchronization rule and/or a request message to the synchronous node in the synchronous network according to the synchronization link topology information. The present document further discloses a controller, a synchronous node, a synchronous network, and a storage medium. 1. A synchronization method , comprising:a controller determining synchronization link topology information of a synchronous network according to physical link topology information of the synchronous network and synchronization information of a synchronous node in the synchronous network;the controller generating a synchronization rule of the synchronous node according to the synchronization link topology information; andthe controller transmitting the synchronization rule and/or a request message to the synchronous node in the synchronous network according to the synchronization link topology information.2. The method according to claim 1 , wherein when the controller transmits a request message to the synchronous node in the synchronous network according to the synchronization link topology information claim 1 , the synchronization rule is carried in the request message.3. The method according to claim 1 , wherein the method further comprises:the controller acquiring the synchronization information of the synchronous node in the synchronous network; andthe controller detecting a physical connection relationship of ports between synchronous nodes to acquire the physical link topology information,and,wherein after transmitting ...

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Номер записи: 78
11-05-2017 дата публикации

A method and a device for generating a timing signal

Номер: US20170134108A1
Автор: Heikki Laamanen, Kenneth Hann
Принадлежит: Individual

A device and a method for generating a secondary timing signal that is synchronous with a primary timing signal are presented. The method comprises deriving ( 401 ) an auxiliary timing signal from an auxiliary signal received at a first site and correcting ( 402, 403 ) the timing phase of the auxiliary timing signal so as to obtain the timing phase for the secondary timing signal. The timing phase is corrected with the aid of the following a) a constant phase shift between the auxiliary timing signal and another auxiliary timing signal derived in a second site where both the primary timing signal and the auxiliary signal are available and b) a dynamic phase shift between the other auxiliary timing signal and the primary timing signal at the second site.

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Номер записи: 79
19-05-2016 дата публикации

METHOD FOR THE CLOCK SYNCHRONIZATION OF A PLURALITY OF MODULES

Номер: US20160142168A1
Автор: LINDNER Thomas
Принадлежит:

A method or an arrangement for the clock synchronization of a plurality of distributed modules of an information or communication system where said modules are coupled via a packet-switched network is adapted so that at least two of said modules are controlled by a local clock generator of the modules using an adjustable frequency, and a clock signal is transmitted via the network in the form of clock signal packets. One of said at least two modules takes over the function of a master module, and all remaining modules synchronize the local clock of the modules with the clock of the master module. 112-. (canceled)13. A method for clock synchronization of a plurality of distributed modules in an information system or a communications system , said modules being coupled via a network , the modules comprising a master module and at least one slave module , the method comprising:the slave module determining a measurement for a deviation of a local clock generator of the slave module relative to a clock generator of the master module, the measurement being determined from a comparison of a first clock signal received from the master module to a second clock signal of the local clock generator of the slave module; andthe slave module using the determined measurement to control the local clock generator of the slave module to synchronize the local clock generator of the slave module to the clock generator of the master module.14. The method of claim 13 , comprising:the master module sending the first clock signal to the slave module via the network.15. The method of claim 13 , wherein the first clock signal is transported via the network at a higher priority as compared to other data packets transmitted via the network.16. The method of claim 13 , wherein the modules are in an information system or a communications system and the network is a packet-switched network.17. The method of claim 13 , wherein the network is configured to utilize a Pulse Code Modulation method to ...

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Номер записи: 80
03-06-2021 дата публикации

TOPOLOGY DISCOVERY IN AN AUTOMOTIVE ETHERNET NETWORK

Номер: US20210167881A1
Автор: BRAND JULIAN, Zinner Helge
Принадлежит:

A node may determine the topology of a computation system. The computation system is a network of nodes and multiple nodes are capable of being a grandmaster clock source. The method includes starting a best clock selection process, announcing clock information, and if the node is not acting grand master then receiving messages announcing clock information from other nodes of the network. Topology information is extracted from the messages, and if the node is acting grandmaster then retiring from the position of grandmaster. The best clock selection process steps are repeated until no node of the network becomes acting grandmaster. 115- (canceled).16. A method of determining a topology of a computation system by a node , wherein the computation system is a network of nodes , and multiple nodes are capable of being a grandmaster clock source , the method comprising:starting a best clock selection process;announcing clock information; receiving messages announcing clock information from other nodes of the network; and', 'extracting topology information from the messages;, 'if the node is not acting grandmaster, then'} 'retiring from a position of grandmaster; and', 'if the node is acting grandmaster, then'}repeating the best clock selection process steps until no node of the network becomes acting grandmaster.17. The method according to claim 16 , wherein the network of nodes is a network of automotive engine control units (ECUs).18. The method according to claim 16 , wherein the step of starting the best clock selection process comprises sending a message announcing clock capabilities of the node sending the message.19. The method according to claim 16 , wherein the best clock selection process uses the best master clock algorithm (BMCA) of IEEE 802.1AS.20. The method according to claim 18 , wherein the message announcing the clock capabilities of the acting grandmaster is an announce message of IEEE 802.1AS.21. The method according to claim 16 , wherein the step of ...

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Номер записи: 81
17-05-2018 дата публикации

SIMPLIFIED SYNCHRONIZED ETHERNET IMPLEMENTATION

Номер: US20180139003A1
Автор: Robitaille Claude, Rochon Steve, Viens Yanick
Принадлежит:

A method of simplifying the implementation of Synchronous Ethernet on an Ethernet device having a first port and a second port device using a predetermined protocol and signaling, comprises delivering a master clock from a Synchronous Ethernet system to the first port of the Ethernet device; transmitting the delivered master clock to the second port of the Ethernet device independently of the protocol and signaling of the Ethernet device; and transmitting the master clock from the second port of the Ethernet device to a downstream device that supports Synchronous Ethernet. In one implementation, the Ethernet device has a local clock, and the method synchronizes the local clock to the master clock. In another implementation, the Ethernet device does not have a local clock, and the master clock is transmitted from the second port of the Ethernet device to the downstream device without any synchronizing operation at the Ethernet device. 18-. (canceled)9. A synchronous ethernet device comprising:a first port comprising a first state machine; anda second port comprising a second state machine; [ the master clock is transmitted to the second, and', 'the master clock is transmitted from the second port to a downstream device that supports synchronous ethernet; and, 'when a master clock is received from the synchronous ethernet system to the first port, the master clock is transmitted to the first, and', 'the master clock is transmitted from the first port to a downstream device that supports synchronous ethernet., 'when the master clock is received from the synchronous ethernet system to the second port], 'wherein,'}10. The device of further comprising a local clock which synchronizes to the master clock.11. The device of in which said ethernet device does not have a local clock claim 9 , and said master clock is transmitted from said first or second port to said downstream device without any synchronizing operation at said ethernet device.12. The device of in which at ...

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Номер записи: 82
26-05-2016 дата публикации

Method and device for detecting fault in synchronization link

Номер: US20160149658A1
Автор: Wang Bin, Xia Liang, Zhang Junhui
Принадлежит:

Disclosed are a method and a device for detecting a fault in a synchronization link. The method includes: setting one or more reference nodes corresponding to a node to be detected (); when the node to be detected starts a detection function, acquiring reference time from the one or more reference nodes and acquiring synchronization time from a synchronization path (); and determining, by the node to be detected, whether there is a fault in the synchronization link between the node to be detected and a Grandmaster Clock (GM) node by using all the reference time and the synchronization time (). 1. A method for detecting a fault in a synchronization link , comprising:setting one or more reference nodes corresponding to a node to be detected;when the node to be detected starts a detection function, acquiring reference time from the one or more reference nodes and acquiring synchronization time from a synchronization path; anddetermining, by the node to be detected, whether there is a fault in the synchronization link between the node to be detected and a Grandmaster Clock (GM) node by using all the reference time and the synchronization time.2. The method according to claim 1 , wherein the step of the node to be detected starting the detection function comprises:establishing, by the node to be detected, one or more detection link which are not overlapped with the existing synchronization link with the one or more reference nodes; andtransmitting, by the node to be detected, a time fault detection message in the one or more detection links in a Transparent Clock (TC) mode.3. The method according to claim 1 , wherein the step of acquiring the reference time from the one or more reference nodes comprises:interacting, by the node to be detected, time stamp information with the one or more reference nodes via a time fault detection message through one or more detection links;calculating a time offset between the node to be detected and a corresponding reference node one by ...

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Номер записи: 83
09-05-2019 дата публикации

METHOD OF OPERATION A DIFFERENTIAL PROTECTION SCHEME

Номер: US20190140440A1
Автор: WESTWOOD JOHN, ZHANG Yanzhong
Принадлежит:

There is provided a method of operating a reconfigurable differential protection scheme for carrying out differential protection of an electrical power network, the electrical power network comprising terminals, each of the terminals configured to be in communication with each other within a communications network. The method includes controlling the differential protection scheme to deactivate the differential protection, and selecting a terminal to be configured out of or into the differential protection scheme. The method also includes communicating reconfiguration information among the terminals, the reconfiguration information including the selection of the terminal to be configured out of or into the differential protection scheme. The method also includes modifying a respective differential protection algorithm at each of the non-selected terminals so as to configure the selected terminal out of or into the differential protection scheme, and controlling the differential protection scheme to reactivate the differential protection. 1. A method of operating a reconfigurable differential protection scheme for carrying out differential protection of an electrical power network , the electrical power network comprising a plurality of terminals , each of the plurality of terminals configured to be in communication with each other of the plurality of terminals within a communications network , the method comprising:controlling the differential protection scheme to deactivate the differential protection;selecting a terminal to be configured out of or into the differential protection scheme;communicating reconfiguration information among the plurality of terminals via the communications network, the reconfiguration information including the selection of the terminal to be configured out of or into the differential protection scheme, wherein the communications network is any one of: a daisy-chain communications network; a ring communications network; a meshed ...

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Номер записи: 84
09-05-2019 дата публикации

Configuration of Synchronisation Network

Номер: US20190140757A1
Автор: Giulio Bottari, Manuel Nardelli, Stefano Ruffini
Принадлежит: Telefonaktiebolaget LM Ericsson AB

Configuring a node ( 410 , A-I, L-O) of a synchronization network, involves determining information about synchronization sources of a plurality of synchronization trails for passing synchronization information from the synchronization source (A, L, O, PRC) to the node to provide a synchronization reference. After determining automatically ( 210, 250, 330, 335, 340 ) synchronization transmission characteristics of trails (EP, FG, GH, HM, MN, OF, FI, IH) which use packet-based communication, the trails are compared automatically ( 240, 370 ), using their source information and their synchronization transmission characteristics, for selecting winch of these trails to use for providing the synchronization reference for the node (N). Compared to selections made based on source alone, using the synchronization transmission characteristics of the pocket based parts can enable a better choice of trail, and can enable comparison with synchronous type trails, and so enable hybrid synchronization network to be configured and maintained.

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Номер записи: 85
10-06-2021 дата публикации

Methods and devices for determining an availability of a synchronization source

Номер: US20210175990A1
Автор: Cuihua Deng
Принадлежит: Telefonaktiebolaget LM Ericsson AB

The present disclosure relates to a method for determining an availability of a synchronization source in a communication system. The method comprises: detecting a stability of the synchronization source when the synchronization source recovers from a failure; and determining the availability of a synchronization source based on the detected stability of the synchronization source. The present disclosure also relates to network devices and a computer readable medium for performing said method.

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Номер записи: 86
10-06-2021 дата публикации

SYSTEMS AND METHODS FOR LARGE PHASE CORRECTION IN R-PHY NETWORK ARCHITECTURES

Номер: US20210175991A1
Автор: Neugeboren Yair
Принадлежит:

Systems and methods for regaining phase synchronization between a CMTS core and an RPD, where the phase synchronization is regained over repeated temporal periods preferably divided between a first interval having a frequency adjustment of a first magnitude and a second interval having a frequency adjustment of a second magnitude. 1. A remote physical device (RPD) synchronized with a first clock in a distributed access CATV architecture according to a first timing protocol and used to communicate synchronization messages with a second clock in a cellular network according to a second timing protocol , the RPD configured to correct a phase offset with the first clock over a time period comprising repeated contiguous sequences of a first interval followed by a second interval , where in the first interval the RPD communicates synchronization messages with the second clock in conformance with the second timing protocol and in the second interval the RPD does not communicate synchronization messages with the second clock in conformance with the second timing protocol.2. The RPD of where the distributed access architecture is an R-PHY architecture.3. The RPD of where the cellular network is an LTE FDD network.4. The RPD of where during the first interval the RPD corrects the phase offset using a frequency adjustment that is fixed with time.5. The RPD of where the frequency adjustment is about 10 ppb.6. The RPD of where during the second interval the RPD corrects the phase offset using a frequency adjustment larger than that of the first interval7. The RPD of where the first interval is longer than the second interval.8. The RPD of where during the second interval the RPD corrects the phase offset using a frequency adjustment that changes with time.9. The RPD of where the frequency adjustment is 10 ppb/s.10. The RPD of where the second interval is divided into a first portion where the frequency adjustment is an increase with time and a second portion where the frequency ...

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Номер записи: 87
24-05-2018 дата публикации

METHODS AND SYSTEMS FOR SYNCHRONIZATION USING DELAY ASYMMETRY

Номер: US20180145781A1
Автор: Boyd Ivan, Chaloupka Zdenek
Принадлежит:

This invention relates to methods and devices for timing synchronization. The invention has particular application where timing is being carried out over packet networks using, for example, the IEEE 1588 Precision Time Protocol (PTP). Embodiments of the invention make use of estimated forward and reverse path delay asymmetries directly in the estimation algorithm (for example a Kalman filter). This can allow the variation in the timestamps which have been compensated for the delay asymmetry to be significantly reduced, which can reduce the complexity of the phase offset estimation algorithm. 1. A method of estimating a phase offset of a local clock in a time client compared with a master clock in a time server connected to the time client over a network , the method including the steps of:sending first timing messages in a forward direction from the time server to the time client and second timing messages in a reverse direction from the time client to the time server, and recording timestamps which are the times of sending and times of receipt of the timing messages;estimating, for each message in a window of predetermined length, the transmission delay experienced by the message;determining, from said estimates, a minimum estimated delay experienced by timing messages in the forward direction in that window, and a minimum estimated delay experienced by timing messages in the reverse direction in that window;determining, for each message in that window, the difference between the estimated transmission delay for that message and the minimum estimated delay for messages travelling in the same direction as that message;determining, from said differences, a queuing asymmetry measure for each exchange of first and second timing messages in that window;estimating the phase offset of the local clock at a time in said window using said timestamps and said queuing asymmetry measure as inputs to an estimation algorithm.2. A method according to claim 1 , wherein the queuing ...

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Номер записи: 88
25-05-2017 дата публикации

Communication apparatus, time synchronizing method, and non-transitory computer-readable storage medium

Номер: US20170150464A1
Автор: Kenji Kazehaya, Masumi Kobayashi, Shigeaki Kawamata, Yuichiro Katagiri
Принадлежит: Fujitsu Ltd

A communication apparatus, for relaying a time synchronizing signal between a master and a slave that transmit PTP (Precision Time Protocol) signals, stores a first time of the communication apparatus at a point in time that the communication apparatus receives a first time synchronizing signal addressed to the slave, obtains a second time of the master at a point in time that the first time synchronizing signal is transmitted from the master, from the first time synchronizing signal or the like, obtains an amount of offset that is a difference between a reference time of the master and a reference time of the communication apparatus, using the first time as a time of the slave and the second time as the time of the master in a time synchronizing algorithm of the PTP, and corrects the reference time of the communication apparatus using the amount of offset.

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Номер записи: 89
02-06-2016 дата публикации

Precise time tagging of events over an imprecese link

Номер: US20160156458A1
Автор: Daniel Babitch, Henry Falk
Принадлежит: SAMSUNG ELECTRONICS CO LTD

A system for precise timing and synchronization of events is provided. The system includes a first terminal including one or more first counters and a packetizer configured to create a packetized data stream having one or more event tags. The system also includes a second terminal that includes one or more second counters and a depacketizer. The second counter(s) is/are configured to count clock pulses generated by a first clock of the first terminal at a first clock rate. The depacketizer is configured to receive the packetized data stream and detect the event tag(s). When the at least one event tag is detected, the second terminal calculates a time at which the first terminal created the packetized data stream based on a count value of the second counter(s) and a count value of the first counter(s) of the first terminal.

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Номер записи: 90
15-09-2022 дата публикации

SYSTEMS AND METHODS FOR SYNCHRONIZING TIME, FREQUENCY, AND PHASE AMONG A PLURALITY OF DEVICES

Номер: US20220294488A1
Автор: ALWOOD Robert Barlow, FARNSWORTH Bradley David, FAULKNER William Todd, GOFF Daniel Thomas, JR. David W. A., KREINAR Edward Joseph, Taylor
Принадлежит:

Aspects of the present disclosure describe a system and method for synchronizing time, frequency, and phase among a plurality of devices. 1. A method comprising:estimating a baseband frequency offset between (1) a first fundamental frequency of a first fundamental clock of a first platform and (2) a second fundamental frequency of a second fundamental clock of a second platform that is movable relative to the first platform, the estimating based on a round-trip radio-frequency (RF) signal comprising a first leg transmitted from the first platform to the second platform and a second leg transmitted from the second platform to the first platform; andcontrolling at least one of: the first fundamental frequency of the first fundamental clock of the first platform, a first fundamental phase of the first fundamental clock of the first platform, a first baseband frequency of a first baseband clock of the first platform, or a first baseband phase of the first baseband clock of the first platform, the controlling based on the estimated baseband frequency offset and a fractional baseband offset between the first baseband clock of the first platform and a second baseband clock of the second platform.2. The method of wherein the fractional baseband offset is based on (1) a number of elapsed clock cycles of the first baseband clock of the first platform claim 1 , (2) at least one of a first code phase or a first code phase slope of the first leg of the round-trip RF signal claim 1 , (3) a number of elapsed clock cycles of the second baseband clock of the second platform claim 1 , and (4) at least one of a second code phase or a second code phase slope of the second leg of the round-trip RF signal.3. The method of wherein the first code phase slope of the first leg of the round-trip RF signal is based on a first carrier phase slope of the first leg of the round-trip RF signal.4. The method of wherein the first carrier phase slope of the first leg of the round-trip RF signal is ...

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Номер записи: 91
31-05-2018 дата публикации

Preventing a network from propagating incorrect time information

Номер: US20180152343A1
Автор: John Bettendorff, Pushpesh Kumar Deshmukh
Принадлежит: Landis and Gyr Innovations Inc

Prior to joining a device to a network, the device is connected to an external system via a local connection. The external system provides the device with a local time stamp that includes a local time value and a local time error value. The device may use the time information to communicate with the external system. After the device is joined to the network, the device may transmit a communication on the network that includes time information. If so, then the communication includes a time value based on the device's time value and a time error value set to a value indicating a maximum error. The network is protected from potentially poor quality time information. Any device that receives the communication rejects the time information since the time error value indicates a maximum error.

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Номер записи: 92
01-06-2017 дата публикации

SIMPLIFIED SYNCHRONIZED ETHERNET IMPLEMENTATION

Номер: US20170155459A1
Автор: Robitaille Claude, Rochon Steve, Viens Yanick
Принадлежит:

A method of simplifying the implementation of Synchronous Ethernet on an Ethernet device having a first port and a second port device using a predetermined protocol and signaling, comprises delivering a master clock from a Synchronous Ethernet system to the first port of the Ethernet device; transmitting the delivered master clock to the second port of the Ethernet device independently of the protocol and signaling of the Ethernet device; and transmitting the master clock from the second port of the Ethernet device to a downstream device that supports Synchronous Ethernet. In one implementation, the Ethernet device has a local clock, and the method synchronizes the local clock to the master clock. In another implementation, the Ethernet device does not have a local clock, and the master clock is transmitted from the second port of the Ethernet device to the downstream device without any synchronizing operation at the Ethernet device. 18-. (canceled)9. A synchronous ethernet device comprising:a first port comprising a first state machine; anda second port comprising a second state machine;the first port and the second port using a predetermined signaling protocol; [ the master clock is transmitted to the second port independently of the predetermined signaling protocol, and', 'the master clock is transmitted from the second port to a downstream device that supports synchronous ethernet; and, 'when a master clock is received from the synchronous ethernet system to the first port, the master clock is transmitted to the first port independently of the predetermined signaling protocol, and', 'the master clock is transmitted from the first port to a downstream device that supports synchronous ethernet., 'when the master clock is received from the synchronous ethernet system to the second port], 'wherein,'}10. The device of further comprising a local clock which synchronizes to the master clock.11. The device of in which said ethernet device does not have a local clock ...

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Номер записи: 93
11-06-2015 дата публикации

Wireless Fire System with Idle Mode and Gateway Redundancy

Номер: US20150163002A1
Автор: FRISON Andrea, Merli Daniel, Polito Daniel
Принадлежит: HONEYWELL INTERNATIONAL INC.

A method and apparatus that includes the steps of providing a plurality of wireless nodes including at least one parent node and at least one child node, a control panel sending instructions to and receiving data from the plurality of nodes through a primary gateway and a wireless subsystem of the gateway, the primary gateway synchronizing the plurality of nodes by periodically transmitting a synchronization signal and one of the plurality of nodes detecting failure of the gateway and transmitting an idle synchronization signal for so long as the one of the plurality of nodes detects failure of the gateway. 1. A method comprising:providing a plurality of wireless nodes including at least one parent node and at least one child node;a control panel sending instructions to and receiving data from the plurality of nodes through a primary gateway and a wireless subsystem of the gateway;the primary gateway synchronizing the plurality of nodes by periodically transmitting a synchronization signal; andone of the plurality of nodes detecting failure of the gateway and transmitting an idle synchronization signal for so long as the one of the plurality of nodes detects failure of the gateway.2. The method as in further comprising the idle synchronization signal inhibiting message traffic from the other of the plurality of nodes.3. The method as in further comprising a backup gateway detecting the idle synchronization signal from the one node and entering an active state.4. The method as in further comprising the backup gateway synchronizing the plurality of nodes by transmitting a synchronization signal.5. The method as in further comprising the one node detecting the synchronization signal from the backup gateway and synchronizing to the backup gateway.6. The method as in further comprising the backup gateway exchanging messages between at least some of the plurality of nodes and the control panel.7. The method as in wherein the one node further comprises a directly coupled ...

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Номер записи: 94
09-06-2016 дата публикации

TIME DIVISION MULTIPLEXED MULTIPORT MEMORY

Номер: US20160163378A1
Автор: BU MING-EN, HUANG Mu-Jen, WAN He-Zhou, WU Ching-Wei, YANG XiuLi
Принадлежит:

In some embodiments, a time division multiplexing (TDM) circuit is configured to receive an external clock signal and generate an internal clock signal that has at least one pulse during a clock cycle of the external clock signal. An address selector is configured to select a current address before a first time within one of the at least one pulse, and select a next address starting from the first time to generate a selected address. An address storage element is configured to receive the selected address from the address selector and provide a passed through or stored address. The provided address is the current address substantially throughout the one of the at least one pulse. A single-port (SP) memory is configured to access at least one SP memory cell at the address provided by the address storage element in response to the internal clock signal. 1. A circuit , comprising:a single-port (SP) memory;a time division multiplexing (TDM) circuit configured to receive an external clock signal and generate an internal clock signal that has at least one pulse during a clock cycle of the external clock signal;an input port selector configured to select current input data before a first time within one of the at least one pulse, and select next input data starting from the first time to generate selected data;an first input port storage element configured to receive the selected data from the input port selector and provide data passed through or stored in the first input port storage element, 'the SP memory is configured to be accessed based on the provided data by the first input port storage element in response to the internal clock signal.', 'wherein the provided data is the current input data substantially throughout the one of the at least one pulse; and'}2. The circuit of claim 1 , wherein the at least one pulse comprises a first pulse and a second pulse;the one of the at least one pulse is the first pulse; a TDM control circuit configured to receive the external ...

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Номер записи: 95
07-06-2018 дата публикации

TIME SLOTTED BUS SYSTEM FOR MULTIPLE COUPLED DIGITAL PHASE-LOCKED LOOPS

Номер: US20180159541A1
Автор: Spijker Menno
Принадлежит:

An apparatus includes a plurality of digital phase-locked loops and a time slotted bus. The time slotted bus is configured to couple the plurality of digital phase-locked loops. The plurality of digital phase-locked loops may be configured to exchange parameters between two or more of the plurality of digital phase-locked loops using one or more time slots of the time slotted bus. 1. An apparatus comprising:a plurality of digital phase-locked loops; anda time slotted bus coupling the plurality of digital phase-locked loops, wherein said plurality of digital phase-locked loops are configured to exchange parameters between two or more of said plurality of digital phase-locked loops using one or more respective time slots of a plurality of time slots of said time slotted bus.2. The apparatus according to claim 1 , wherein each of said digital phase-locked loops comprises a bus interface module coupling said digital phase-locked loop to said time slotted bus.3. The apparatus according to claim 2 , wherein each of said bus interface modules is configured to fetch data from or present data to said time slotted bus during said one or more respective time slots of said plurality of time slots of said time slotted bus.4. The apparatus according to claim 2 , wherein at least two of said bus interface modules are configured to transmit parameter data to said time slotted bus during said one or more respective time slots of said plurality of time slots of said time slotted bus.5. The apparatus according to claim 1 , wherein said time slotted bus comprises a first bus communicating parameter data and a second bus communicating address information identifying said time slots.6. The apparatus according to claim 5 , wherein said time slotted bus further comprises an address generator driving said second bus.7. The apparatus according to claim 6 , wherein said address generator is configured to cycle through a number of addresses corresponding to the time slots associated with said ...

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Номер записи: 96
08-06-2017 дата публикации

Radio communication apparatus and radio communication method

Номер: US20170161786A1
Автор: Ryo Okumura, Takahiro Tomida, Toshihiro Takahashi, Tsutomu Terazaki
Принадлежит: Casio Computer Co Ltd

A radio communication apparatus performing radio communication based on either role, a master or a slave, includes: a role change receiver receiving a role change request from a master to a slave when the radio communication apparatus has a role of master and has established connection to another radio communication apparatus operating as a slave; and an identification information transmitter transmitting identification information to the other radio communication apparatus on a given channel at shorter time intervals when the role change receiver receives the change request than a given comparison criterion for when the role change receiver does not receive the change request.

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Номер записи: 97
23-05-2019 дата публикации

Time Synchronization Method and Device

Номер: US20190158204A1
Автор: Cheng Zhu, Luo Junfeng, Wang Jinhui, Wu Feng
Принадлежит:

A time synchronization method and a device, where the method includes generating, by a first device, a first time synchronization frame according to a first coding scheme, where the first time synchronization frame includes a first frame header and a first time of day (TOD), the first frame header carries an identifier of the first coding scheme, and the first coding scheme defines a boundary of the first time synchronization frame and a location of the first TOD in the first time synchronization frame, and sending, by the first device, the first time synchronization frame to a second device using a first single line to trigger the second device to identify the first time synchronization frame according to the identifier of the first coding scheme, to obtain the first TOD from the first time synchronization frame, and to trace a time of the first device according to the first TOD. 1. A time synchronization method , comprising:generating, by a first device, a first time synchronization frame according to a first coding scheme, wherein the first time synchronization frame comprises a first frame header and a first time of day (TOD), wherein the first frame header carries an identifier of the first coding scheme, and wherein the first coding scheme defines a boundary of the first time synchronization frame and a location of the first TOD in the first time synchronization frame; andsending, by the first device, the first time synchronization frame to a second device using a first single line to trigger the second device to identify the first time synchronization frame according to the identifier of the first coding scheme, to obtain the first TOD from the first time synchronization frame, and to trace a time of the first device according to the first TOD.2. The time synchronization method of claim 1 , further comprising:receiving, by the first device, a second time synchronization frame generated according to a second coding scheme from a third device using a second ...

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Номер записи: 98
24-06-2021 дата публикации

NETWORK MANAGEMENT SYSTEM AND METHOD FOR SYNCHRONIZATION OF COMMUNICATION NETWORK

Номер: US20210194613A1
Автор: HONG Hoopyo, KWON Donghee
Принадлежит: SOLiD, INC.

A synchronization method of a communication network, the synchronization method comprises monitoring a connection state of second communication nodes that are synchronized using a synchronization signal provided through a first communication node to which a synchronization source is connected, determining whether the number of the connected second communication nodes exceeds a reference value according to a result of the monitoring and switching a synchronization mode of at least one second communication node when the number of the second communication nodes exceeds a reference value. 1. A synchronization method of a communication network , the synchronization method comprising:monitoring a connection state of second communication nodes that are synchronized using a synchronization signal provided through a first communication node to which a synchronization source is connected;determining whether the number of the connected second communication nodes exceeds a reference value according to a result of the monitoring; andswitching a synchronization mode of at least one second communication node when the number of the second communication nodes exceeds a reference value.2. The synchronization method of claim 1 , wherein the communication network comprises:at least any one of a headend device, an extension device, and a remote device.3. The synchronization method of claim 2 , wherein the first communication node to which the synchronization source is connected is the extension device or the remote device.4. The synchronization method of claim 1 , wherein the communication network performs synchronization according to the IEEE 1588 PTP protocol.5. The synchronization method of claim 1 , wherein the first communication node operates as a grand master node in synchronization of the communication network.6. The synchronization method of claim 1 , wherein the second communication nodes operate in a synchronization mode of a transparent clock mode claim 1 , a boundary clock ...

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Номер записи: 99
29-09-2022 дата публикации

TIME SYNCHRONIZATION METHOD AND DEVICE, NETWORK NODE DEVICE

Номер: US20220311529A1
Автор: BAI Yiming, Wei Xiangye, Xiu Liming
Принадлежит:

There is provided a time synchronization method, including: an adjustment stage including N adjustment cycles, N being an integer greater than 1; in each adjustment cycle, generating a physical clock signal at least according to a pre-acquired frequency control word corresponding to the adjustment cycle, and obtaining logical time at least according to the physical clock signal and a physical time deviation; a clock slope of the physical clock signal generated in each adjustment cycle reaches its corresponding target value, and the target values of the clock slopes of the physical clock signals in the N adjustment cycles gradually approach 1; the physical time deviation is: a time difference between the reference time and the physical time corresponding to the physical clock signal in an Nth adjustment cycle at the end of the Nth adjustment cycle. A time synchronization device and a network node device are provided. 1. A time synchronization method , comprising: an adjustment stage comprising N adjustment cycles , N being an integer greater than 1;in each adjustment cycle, generating a physical clock signal at least according to a pre-acquired frequency control word corresponding to the adjustment cycle, and obtaining logical time at least according to the physical clock signal and a physical time deviation;wherein a clock slope of the physical clock signal generated in each adjustment cycle reaches its corresponding target value, and the target values of the clock slopes of the physical clock signals in the N adjustment cycles gradually approach 1 from a first adjustment cycle to an Nth adjustment cycle; the clock slope is a slope of a relationship curve between physical time generated based on the physical clock signal and reference time; and the physical time deviation is: a time difference between the reference time and the physical time corresponding to the physical clock signal in the Nth adjustment cycle at the end of the Nth adjustment cycle.2. The time ...

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Номер записи: 100