WO2019084732A1 - 时钟同步的方法和装置 - Google Patents
时钟同步的方法和装置 Download PDFInfo
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- WO2019084732A1 WO2019084732A1 PCT/CN2017/108417 CN2017108417W WO2019084732A1 WO 2019084732 A1 WO2019084732 A1 WO 2019084732A1 CN 2017108417 W CN2017108417 W CN 2017108417W WO 2019084732 A1 WO2019084732 A1 WO 2019084732A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0647—Synchronisation among TDM nodes
- H04J3/065—Synchronisation among TDM nodes using timestamps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0079—Receiver details
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0664—Clock or time synchronisation among packet nodes using timestamps unidirectional timestamps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/16—Time-division multiplex systems in which the time allocation to individual channels within a transmission cycle is variable, e.g. to accommodate varying complexity of signals, to vary number of channels transmitted
- H04J3/1605—Fixed allocated frame structures
- H04J3/1652—Optical Transport Network [OTN]
- H04J3/1658—Optical Transport Network [OTN] carrying packets or ATM cells
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J2203/00—Aspects of optical multiplex systems other than those covered by H04J14/05 and H04J14/07
- H04J2203/0001—Provisions for broadband connections in integrated services digital network using frames of the Optical Transport Network [OTN] or using synchronous transfer mode [STM], e.g. SONET, SDH
- H04J2203/0073—Services, e.g. multimedia, GOS, QOS
- H04J2203/0082—Interaction of SDH with non-ATM protocols
- H04J2203/0085—Support of Ethernet
Definitions
- Flexible Ethernet is an Ethernet developed on the basis of traditional Ethernet. FlexE defines a variable rate interface between a router and an optical transport network (OTN). The main purpose is to simplify the mapping and transmission of the Ethernet interface on the OTN. FlexE is based on rate-binding technology and flexible mapping between Ethernet interfaces and OTNs to achieve greater transmission rates and transmission bandwidths.
- the receiving device continuously, periodically stamps (ie, performs timestamp sampling) on the data block received by each PHY, and generates multiple receiving timestamps, and the multiple receiving timestamps. Include a timestamp corresponding to a data block (ie, a second data block) for performing timestamp sampling in a plurality of data blocks, for each The timestamp is aligned, that is, waiting for the PHY (ie, the first PHY) of the last one of the plurality of PHYs to receive the overhead block (OH), and receiving the first received after the first PHY receives the overhead block
- the timestamp of the data block ie, the first timestamp
- the timestamp of the data block received by the other PHYs in the plurality of PHYs is adjusted, and the first timestamp is regarded as being received by all the PHYs after receiving the overhead block.
- the receiving device aligns the plurality of receiving timestamps with the first receiving timestamp as a reference, and the receiving device adjusts the plurality of times according to the duration of the receiving period and based on the first receiving timestamp. Receive the value of the timestamp.
- FIG. 2 is a schematic diagram of a partial architecture of a FlexE suitable for use in the present application
- a PHY can be defined as providing mechanical, electrical, functional, and specification characteristics for the physical link establishment, maintenance, and teardown required to transmit data.
- the PHY mentioned herein may include a physical layer working device at both ends of the transmitting and receiving, and an optical fiber between the transmitting and receiving ends, and the physical layer working device may include, for example, a physical layer interface device of Ethernet.
- FlexE introduces a bundled group, a flexible Ethernet client (FlexE client, hereinafter referred to as "customer"), a time slot configuration table (calendar), and a flexible Ethernet time division multiplexing layer (based on the traditional Ethernet). FlexE shim, hereinafter referred to as the "time division multiplexing layer” and other new concepts.
- FIG. 2 shows a partial architectural diagram of a FlexE suitable for use in the present application.
- the above architecture is only an example, and the architecture of the FlexE applicable to the present application is not limited thereto.
- RS adaptation sublayer
- FEC forward error correction
- FIG. 4 shows a schematic diagram of a method of transmitting a message through a dual PHY.
- PHY A and PHY B are two physical links belonging to a 2 x 100GE FlexE bundle. Based on the FlexE bundle, there are two 100 Gbps customers, namely customer 1 and customer. 2.
- the method provided in this embodiment passes The number of bits spaced between each data block and the reference data block is recorded, so that the receiving time of the first data block can be calculated according to the correspondence between the bit and time, that is, the receiving time stamp of the first data block is determined.
- the method provided by the present application can continuously track the position of the timestamp sample points.
- the method 700 further includes:
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
Description
Claims (12)
- 一种时钟同步的方法,其特征在于,包括:接收装置通过多个物理层模块PHY接收多个数据块,所述多个数据块包括多个首位数据块,所述首位数据块为所述PHY中传输的数据块中最先到达所述接收装置的数据块,所述多个首位数据块与所述多个PHY一一对应;所述接收装置对所述多个数据块进行时间戳采样生成多个接收时间戳;所述接收装置以第一接收时间戳为基准对齐所述多个接收时间戳,所述第一接收时间戳为所述多个接收时间戳中对应第一数据块的接收时间戳,所述第一数据块为通过第一PHY传输的数据块,所述第一PHY为所述多个首位数据块中最晚到达所述接收装置的首位数据块对应的PHY;所述接收装置根据所述多个数据块生成时钟同步报文;所述接收装置将第二接收时间戳的值写入所述时钟同步报文,其中,所述第二接收时间戳为基于对齐后的所述多个接收时间戳确定的第二数据块的接收时间戳,所述第二数据块为所述多个数据块中用于进行发送时间戳采样的数据块,且所述第二数据块的发送时间戳为所述时钟同步报文的发送时间戳。
- 根据权利要求1所述的方法,其特征在于,所述接收装置以第一接收时间戳为基准对齐所述多个接收时间戳,包括:所述接收装置以接收周期的时长为单位并且以所述第一接收时间戳为基准调整所述多个接收时间戳的值,所述接收周期为对所述多个数据块进行时间戳采样的周期。
- 根据权利要求2所述的方法,其特征在于,所述接收周期的时长等于所述接收装置接收X位数据所需的时长,所述X为所述接收装置的数据总线位宽的值或所述接收装置的串行并行转换端口的数据缓冲位宽的值中较小的值。
- 根据权利要求1至3中任一项所述的方法,其特征在于,所述接收装置根据所述多个数据块生成所述时钟同步报文之前,所述方法还包括:所述接收装置删除所述第一PHY对应的接收时间戳之外的接收时间戳。
- 根据权利要求1至4中任一项所述的方法,其特征在于,所述第二数据块为所述时钟同步报文的帧分隔符起始SFD对应的数据块。
- 根据权利要求1至5中任一项所述的方法,其特征在于,所述时钟同步报文承载于灵活以太网FlexE的客户净荷中。
- 一种时钟同步的装置,其特征在于,包括处理单元和通信单元,所述通信单元用于:通过多个物理层模块PHY接收多个数据块,所述多个数据块包括多个首位数据块,所述首位数据块为所述PHY中传输的数据块中最先到达所述接收装置的数据块,所述多个首位数据块与所述多个PHY一一对应;所述处理单元用于:对所述通信单元接收到的所述多个数据块进行时间戳采样生成多个接收时间戳;以第一接收时间戳为基准对齐所述多个接收时间戳,所述第一接收时间戳为所述多个接收时间戳中对应第一数据块的接收时间戳,所述第一数据块为通过第一PHY传输的数据块,所述第一PHY为所述多个首位数据块中最晚到达所述接收装置的首位数 据块对应的PHY;根据所述多个数据块生成时钟同步报文;将第二接收时间戳的值写入所述时钟同步报文,其中,所述第二接收时间戳为基于对齐后的所述多个接收时间戳确定的第二数据块的接收时间戳,所述第二数据块为所述多个数据块中用于进行发送时间戳采样的数据块,且所述第二数据块的发送时间戳为所述时钟同步报文的发送时间戳。
- 根据权利要求7所述的装置,其特征在于,所述处理单元具体用于:以接收周期的时长为单位并且以所述第一接收时间戳为基准调整所述多个接收时间戳的值,所述接收周期为对所述多个数据块进行时间戳采样的周期。
- 根据权利要求8所述的装置,其特征在于,所述接收周期的时长等于所述接收装置接收X位数据所需的时长,所述X为所述接收装置的数据总线位宽的值或所述接收装置的串行并行转换端口的数据缓冲位宽的值中较小的值。
- 根据权利要求7至9中任一项所述的装置,其特征在于,所述处理单元还用:所述接收装置删除所述第一PHY对应的接收时间戳之外的接收时间戳。
- 根据权利要求7至10中任一项所述的装置,其特征在于,所述第二数据块为所述时钟同步报文的帧分隔符起始SFD对应的数据块。
- 根据权利要求7至11中任一项所述的装置,其特征在于,所述时钟同步报文承载于灵活以太网FlexE的客户净荷中。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA3081109A CA3081109C (en) | 2017-10-30 | 2017-10-30 | Clock synchronization method and apparatus |
| CN202210351019.5A CN114944910B (zh) | 2017-10-30 | 2017-10-30 | 时钟同步的方法和装置 |
| EP17930848.1A EP3694140A4 (en) | 2017-10-30 | 2017-10-30 | METHOD AND DEVICE FOR CLOCK SYNCHRONIZATION |
| PCT/CN2017/108417 WO2019084732A1 (zh) | 2017-10-30 | 2017-10-30 | 时钟同步的方法和装置 |
| CN201780094495.0A CN111095860B (zh) | 2017-10-30 | 2017-10-30 | 时钟同步的方法和装置 |
| AU2017437863A AU2017437863B2 (en) | 2017-10-30 | 2017-10-30 | Clock synchronization method and apparatus |
| BR112020008501-4A BR112020008501A2 (pt) | 2017-10-30 | 2017-10-30 | método e aparelho de sincronização de relógio |
| US16/860,688 US11108485B2 (en) | 2017-10-30 | 2020-04-28 | Clock synchronization method and apparatus |
| US17/403,131 US11552721B2 (en) | 2017-10-30 | 2021-08-16 | Clock synchronization method and apparatus |
| US18/146,634 US11843452B2 (en) | 2017-10-30 | 2022-12-27 | Clock synchronization method and apparatus |
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| PCT/CN2017/108417 WO2019084732A1 (zh) | 2017-10-30 | 2017-10-30 | 时钟同步的方法和装置 |
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| US (3) | US11108485B2 (zh) |
| EP (1) | EP3694140A4 (zh) |
| CN (2) | CN114944910B (zh) |
| AU (1) | AU2017437863B2 (zh) |
| BR (1) | BR112020008501A2 (zh) |
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- 2017-10-30 CN CN202210351019.5A patent/CN114944910B/zh active Active
- 2017-10-30 CN CN201780094495.0A patent/CN111095860B/zh active Active
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| EP4135225A4 (en) * | 2020-04-08 | 2023-10-11 | ZTE Corporation | METHOD AND APPARATUS FOR TRANSMITTING SERVICE FLOWS AND DEVICE AND STORAGE MEDIUM |
| US12224943B2 (en) | 2020-04-08 | 2025-02-11 | Zte Corporation | Service flow transmission method and apparatus, device, and storage medium |
| CN115834921A (zh) * | 2022-11-17 | 2023-03-21 | 北京奇艺世纪科技有限公司 | 视频处理方法、装置、服务器、存储介质及程序产品 |
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| AU2017437863A1 (en) | 2020-05-21 |
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| US20210376943A1 (en) | 2021-12-02 |
| US11843452B2 (en) | 2023-12-12 |
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| CN111095860B (zh) | 2022-04-12 |
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| US11552721B2 (en) | 2023-01-10 |
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