公开(公告)号：US11916661B2

公开(公告)日：2024-02-27

申请号：US16454807

申请日：2019-06-27

申请人： Ciena Corporation

发明人： Sebastien Gareau ,  Andrew McCarthy

IPC分类号： H04J3/06 ,  G06F11/16

CPC分类号： H04J3/0673 ,  G06F11/1679 ,  H04J3/0667 ,  H04J3/0697

摘要： Systems and methods for timing over a Metro Transport Networking (MTN) path include detecting a specific block in a stream of blocks, wherein each block is encoded based on a line code, and sampling an output of a clock to determine a timestamp reference based on detection of the specific block, and transmitting timing information based on the timestamp reference. The specific block can be a control block. The timing information can be transmitted via a Precision Time Protocol (PTP) message. The timing information can be transmitted via a plurality of subsequent specific blocks.

公开(公告)号：US20230370187A1

公开(公告)日：2023-11-16

申请号：US18313542

申请日：2023-05-08

申请人： CANON KABUSHIKI KAISHA

发明人： TETSUYA YAMAMOTO

IPC分类号： H04J3/06 ,  H04W4/12 ,  H04N23/661

CPC分类号： H04J3/0673 ,  H04W4/12 ,  H04N23/662

摘要： A communication apparatus includes at least a processor and at least a memory. The at least memory contains instructions that, when executed by the at least processor, cause the at least processor to perform operations comprising performing a determination process and performing a setting process. The determination process determines whether the communication apparatus operates as a leader apparatus in communication or operates as a follower apparatus in the communication. The setting process, based on a result of the determination process, sets the communication apparatus to be a time master apparatus that is a provider of a reference clock for implementing time synchronization with one or more other communication apparatuses or to be a time slave apparatus that adjusts time in accordance with the reference clock.

公开(公告)号：US20180331772A1

公开(公告)日：2018-11-15

申请号：US16030326

申请日：2018-07-09

申请人： CenturyLink Intellectual Property LLC

发明人： Jeff Farra ,  Paul Johnson ,  Thomas Schwengler

IPC分类号： H04J3/06 ,  H04J14/02 ,  H04B10/079 ,  H04W56/00

CPC分类号： H04J3/0673 ,  H04B10/0793 ,  H04J3/0644 ,  H04J3/0667 ,  H04J3/0682 ,  H04J14/021 ,  H04W56/0045

摘要： Novel tools and techniques are provided for implementing network timing functionality. In some embodiments, a grand master clock(s) might receive a first timing signal from a global positioning system (“GPS”) source via a GPS antenna(s), and might send a second timing signal (which might be based at least in part on the first timing signal) to a slave clock(s), in some cases, via one or more network elements or the like. A computing system might calculate various transmission times for the second timing signal to be transmitted between the grand master clock(s) and the slave clock(s), and might calculate any time delay differences in the transmission times, might generate a third timing signal based at least in part on the calculated time delay differences (if any), and might send the third timing signal to one or more network elements, thereby providing Accurate Synchronization as a Service (“ASaaS”) functionality.

公开(公告)号：US20180262287A1

公开(公告)日：2018-09-13

申请号：US15760870

申请日：2016-09-05

申请人： CHINA MOBILE COMMUNICATIONS GROUP CO., LTD

发明人： Liuyan HAN ,  Han LI

IPC分类号： H04J3/06

CPC分类号： H04J3/0658 ,  H04J3/0641 ,  H04J3/0667 ,  H04J3/0673

摘要： Provided are a time synchronization packet processing method and device, which are applied to a time synchronization node. The processing method comprises: according to a change condition of received time source information, judging whether a time synchronization node tracking time source changes; and when the time synchronization node tracking time source changes, and after a predetermined time delay, sending to a downstream clock node a time synchronization packet parameter modified according to the change condition of the time source information. By distinguishing a change condition of time source information input by a time synchronization node, and when the change condition of the time source information changes a time synchronization node tracking time source, setting a certain delay time for changing and outputting a time synchronization packet parameter, the present invention avoids unnecessary downstream oscillation, and ensures the stable operation of a time synchronization network.

公开(公告)号：US10075253B2

公开(公告)日：2018-09-11

申请号：US14905688

申请日：2015-02-20

申请人： TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)

发明人： Mikael Olofsson ,  Stefano Ruffini

IPC分类号： H04J3/08 ,  H04J3/06 ,  H04L12/841 ,  H04L12/26

CPC分类号： H04J3/0673 ,  H04L43/0858 ,  H04L43/10 ,  H04L47/28 ,  H04L47/283

摘要： Method and arrangement for providing delay information to synchronization packets passing a transport network node. In a transport network node synchronization packets propagate from a synchronization master node towards boundary clock nodes. The synchronization packets pass the transport network node, in which the synchronization packets are received, and a level of delay is determined. Furthermore, when the level of delay for the synchronization packets is above a threshold, the synchronization packets are marked with a delay indication. The received synchronization packets are sent to the boundary clock node or ordinary clock node, whether or not they are marked. By implementing functionality for determining a level of delay of synchronization packets, and marking passing synchronization packets with delay indications, boundary clock nodes and ordinary clock nodes may differentiate the received synchronization packets based on the delay identifications. Thereby, improved accuracy may be achieved when calculating time synchronization offsets.

公开(公告)号：US20180069801A1

公开(公告)日：2018-03-08

申请号：US15797831

申请日：2017-10-30

申请人： Huawei Technologies Co., Ltd.

发明人： Yunlei QI ,  Chunrong LI

IPC分类号： H04L12/841 ,  H04L12/26

CPC分类号： H04L47/283 ,  H04J3/0647 ,  H04J3/0667 ,  H04J3/0673 ,  H04L43/0852 ,  H04L43/16 ,  H04W56/00

摘要： A communications network delay variation smoothing method, an apparatus, and a system are disclosed. The method includes: clearing, by a local device, a forward delay threshold and a reverse delay threshold when an initialization time starts; and when determining that a maximum value between a real-time forward delay value corresponding to a current service flow fragment and a reverse delay threshold corresponding to the current service flow fragment is greater than a current value of the forward delay threshold, replacing the current value of the forward delay threshold with the maximum value. In this way, after the initialization ends, a delay threshold after the initialization ends is determined and is applied to delay compensation, thereby significantly reducing a bi-directional asymmetric delay variation, and avoiding a problem of abnormal user communication that is caused when the variation exceeds a limit.

公开(公告)号：US09860004B2

公开(公告)日：2018-01-02

申请号：US14503082

申请日：2014-09-30

申请人： MICROSEMI STORAGE SOLUTIONS, INC.

发明人： Thomas Kirkegaard Joergensen

IPC分类号： H04J3/06

CPC分类号： H04J3/0697 ,  H04J3/0667 ,  H04J3/0673

摘要： A transparent clock may be provided between edge nodes of a non-precision time protocol network, with an arrival time of a packet at an edge of the non-precision time protocol network carried in a reserved field of a packet.

公开(公告)号：US09847868B2

公开(公告)日：2017-12-19

申请号：US14234940

申请日：2012-07-13

申请人： Sebastien Jobert ,  Frédéric Jounay

发明人： Sebastien Jobert ,  Frédéric Jounay

IPC分类号： H04J3/06 ,  H04L7/00 ,  H04L12/701

CPC分类号： H04L7/0016 ,  H04J3/0667 ,  H04J3/0673 ,  H04L45/00

摘要： A method of routing synchronization messages in a packet communication network, in which a packet is routed using a global routing table. A piece of equipment in the network implements the following steps: detecting a packet carrying a synchronization message in a packet stream; determining an output port; emitting a packet carrying the message at the determined output port, the message being modified using a piece of information representing a time of transit in the equipment. A synchronization routing table, which stores at least one association between an input port and at least one output port, is configured in the equipment. When the packet carrying the received message indicates a routing needs to be carried out using the synchronization table, the output port for this packet is determined by the equipment according to an input port on which the packet is received and by reading the synchronization table.

公开(公告)号：US20170359138A1

公开(公告)日：2017-12-14

申请号：US15275316

申请日：2016-09-23

申请人： Apple Inc.

发明人： Ashley I. Butterworth ,  Daniel C. Klingler ,  Simon E. C. Goldrei

IPC分类号： H04J3/06 ,  H04L29/06

CPC分类号： H04J3/0661 ,  H04J3/0664 ,  H04J3/0673 ,  H04L69/08 ,  H04L69/28

摘要： A bridge element is provided for establishing clock synchronization across network elements including a first network element using a first clock synchronization transport protocol and a second network element using a second clock synchronization transport protocol different from the first clock synchronization transport protocol. The bridge element includes a port, a protocol translation port and an interconnect structure. The port may receive a clock synchronization signal from the first network element using the first clock synchronization protocol. The interconnect structure may receive the clock synchronization signal from the port. The protocol translation port may receive the clock synchronization signal from the interconnect structure, translate the clock synchronization signal between the first clock synchronization transport protocol and the second clock synchronization transport protocol, and provide the translated clock synchronization signal to the second network element using the second clock synchronization protocol.

公开(公告)号：US09667370B2

公开(公告)日：2017-05-30

申请号：US14477605

申请日：2014-09-04

申请人： Avago Technologies General IP (Singapore) Pte. Ltd.

发明人： Shr-Jie Tzeng ,  Josef Lo

IPC分类号： H04J3/06 ,  H04L29/06 ,  H04L12/54 ,  H04L12/841

CPC分类号： H04J3/0667 ,  H04J3/0673 ,  H04L12/56 ,  H04L47/28 ,  H04L69/22 ,  H04L69/28

摘要： A system and method for timing synchronization between network nodes. The timing synchronization can conform to the Precision Time Protocol (PTP) as defined in the IEEE 1588 protocol. The timing synchronization can include the insertion of ingress and/or egress timestamps into packets. For example, timestamps can be inserted into reserved fields of the header of a packet. The timing synchronization can also include the utilization of one or more reserved fields to initiate the generation of a timestamp upon the transmission of the packet and/or the retrieval of a previously stored timestamp.