WO2011143973A1 - 一种设备之间进行时钟同步的方法和装置 - Google Patents
一种设备之间进行时钟同步的方法和装置 Download PDFInfo
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- WO2011143973A1 WO2011143973A1 PCT/CN2011/072214 CN2011072214W WO2011143973A1 WO 2011143973 A1 WO2011143973 A1 WO 2011143973A1 CN 2011072214 W CN2011072214 W CN 2011072214W WO 2011143973 A1 WO2011143973 A1 WO 2011143973A1
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Classifications
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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
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
- H04L43/0858—One way delays
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
- H04L43/0852—Delays
- H04L43/0864—Round trip delays
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L43/00—Arrangements for monitoring or testing data switching networks
- H04L43/10—Active monitoring, e.g. heartbeat, ping or trace-route
- H04L43/106—Active monitoring, e.g. heartbeat, ping or trace-route using time related information in packets, e.g. by adding timestamps
Definitions
- the present invention relates to the field of network communication, and in particular, to a method and apparatus for clock synchronization between devices. Background technique
- the Connection Fault Management (CFM) function can effectively check, isolate, and report connectivity faults on the virtual bridge LAN.
- CFM management is network delay jitter calculation (ETH-DM, Ethernet Delay Measurement) function.
- ETH-DM network delay jitter calculation
- TWO-DM Two-way Delay Measurements
- ONE-way frame delay measurement ONE-way frame delay measurement
- the TWO-DM measurement is performed by sending a periodic ETH-DM frame to a peer maintenance maintenance point (MEP) and receiving a response information frame with ETH-DM from the peer MEP within the diagnostic interval.
- MEP peer maintenance maintenance point
- the MEP also expects to receive a response frame with ETH-DM information from the peer MEP.
- TWO-DM the clock between the two devices can calculate an accurate delay value even if it is not synchronized.
- the measurement process of TWO-DM is shown in Figure 1.
- the local MEP sends a frame with ETH-DM request information.
- the frame carries TxTimeStampf, and the peer MEP responds with a frame with ETH-DM reply information.
- the frame has TxTimeStampf copied from the ETH-DM request information, and timestamp information received and sent by the peer MEP.
- the local MEP receives the frame with the ETH-DM reply information, and performs frame delay calculation according to the four timestamps carried.
- the timestamp is the timestamp when the peer sends the response packet, and the timestamp is the timestamp when the peer receives the local packet.
- the measurement process of ONE-DM is shown in Figure 2.
- the measurement of the unidirectional frame delay is calculated by the difference between the time when the peer receives the time and the time when the local end transmits.
- the local MEP and the peer MEP are required. Clock synchronization.
- the problem to be solved by the present invention is to provide a method and apparatus for clock synchronization between devices to overcome the drawbacks of low precision of clock synchronization between devices in the prior art.
- the technical solution of the present invention provides a method for performing clock synchronization between devices, where the method includes the following steps: A: performing coarse synchronization of a clock between the local end and the opposite end by using a network clock protocol, The accuracy of the coarse synchronization is accurate to the second level. B. The local end initiates the measurement of the two-way network delay, and obtains the time when the peer sends the response packet, the time when the local end receives the response packet, and the bidirectional frame delay. The half of the bidirectional frame delay is used as the unidirectional frame delay; C.
- the step B is repeated according to the preset number of times, and the time when the response message is sent according to the obtained multiple peers, and the local end receives the response message
- the time and the unidirectional frame delay are obtained, and the average value of the time when the peer end sends the response message, the average value of the time when the local end receives the response message, and the unidirectional frame average sum, and the local end receiving
- the time value of the response time is subtracted to obtain a time correction value; E.
- the local end acquires the local current time, and corrects the local current time according to the time correction value.
- the step B includes: b, the local end sends a message to the peer end, the message carries the time when the local end sends the message; B2, the peer end returns a response message to the local end, The response message carries the time when the local end sends the message, the time when the peer receives the local message, and the time when the peer sends the response message. B3.
- the local end receives the response message, and according to formula:
- step C includes: Cl, repeating n-1 times, step B, performing a total of n times of bidirectional network delay measurement, where n is a preset number of times; C2, according to the formula:
- TxTimeStampbaver ( TxTimeStampb i + TxTimeStampb 2 +... TxTimeStampb n ) ⁇ n, Calculate the average of the time when the peer sends a response message, where TxTimeStampb avCT is the average of the time when the peer sends a response message, TxTimeStampbi ,... TxTimeStampb n is the time when the response message is sent by the peer obtained each time; according to the formula:
- step D includes: according to the formula:
- Minus ( RxTimebaver - (TxTimeStampb aver + Delay aver ), calculate the time correction value, where Minus is the time correction value, RxTimeb avCT is the average value of the time when the end receives the response message, and TxTimeStampb avCT is the peer to send the response report.
- the average value of the time of the text, Delay avCT is Unidirectional frame average delay.
- the method further includes: initiating a two-way network delay measurement at the opposite end, and repeating steps B ⁇ E to correct the local current time of the opposite end.
- the method further includes: the local end sends a unidirectional network delay measurement to obtain a unidirectional frame delay, and the method includes: the local end sends a packet to the opposite end, where The packet carries the time when the local end sends the packet; the peer receives the packet, and subtracts the time when the peer receives the time from the peer to obtain the unidirectional frame delay.
- the technical solution of the present invention further provides a device for performing clock synchronization between devices, where the device includes: a coarse synchronization unit, configured to perform coarse synchronization on a clock between the local end and the opposite end by using a network clock protocol, where the coarse synchronization The accuracy is accurate to the second level; the two-way network delay measurement unit is used for the local end to initiate the two-way network delay measurement, the time when the peer sends the response, the time when the local end receives the response message, and the bidirectional frame time.
- an average value obtaining unit configured to: time when the response message is sent according to the obtained multiple peers, and time when the local end receives the response message And the unidirectional frame delay, the average value of the time when the peer sends the response, the average of the time when the local end receives the response, and the unidirectional frame average delay; the time correction value acquisition unit The sum of the average value of the time when the peer end sends the response packet and the average time delay of the unidirectional frame, and the average of the time when the local end receives the response message Save, to give time correction value; a correction unit configured to obtain the local current local time, and the current value of the local time is corrected according to the time correction.
- the device further includes: a unidirectional network delay measurement unit, configured to perform a unidirectional network delay measurement to obtain a unidirectional frame delay after the local current time of the local end and/or the opposite end is corrected.
- a unidirectional network delay measurement unit configured to perform a unidirectional network delay measurement to obtain a unidirectional frame delay after the local current time of the local end and/or the opposite end is corrected.
- the invention calculates the time delay between the devices by using the TWO-DM function, obtains the unidirectional frame average delay between the devices, and corrects the local current time by using the local current time of the device and the average delay of the unidirectional frame, thereby Clock synchronization between devices is achieved, and the accuracy of the clock synchronization is high enough to be accurate to the nanosecond level.
- FIG. 1 is a flow chart of a measurement process of a TWO-DM in the prior art
- FIG. 3 is a flowchart of a method for clock synchronization between devices according to an embodiment of the present invention
- FIG. 4 is a structural diagram of an apparatus for performing clock synchronization between devices according to an embodiment of the present invention. detailed description
- the flow of the method for performing clock synchronization between devices in the embodiment of the present invention is as shown in FIG. 3, and includes the following steps:
- Step s301 Perform coarse synchronization on the clock between the local end and the opposite end by using a network clock protocol, and the precision of the coarse synchronization is accurate to the second level.
- step s302 the local end initiates a two-way network delay measurement, obtains the time when the peer sends the response, the time when the local end receives the response, and the bidirectional frame delay, and takes half of the two-way frame delay as One-way frame delay. Specifically, the following steps are included:
- the local end sends a ⁇ message to the peer end, where the ⁇ message carries the time when the local end sends the ⁇ T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T
- the peer end returns a response to the local end, and the response message carries the time TxTimeStampf when the local end sends the message, and the time RxTimeStampf and the opposite end when the peer end receives the local message.
- the RxTimeStampf is 17:10:15, 500060 nanoseconds
- the TxTimeStampb is 17:10:17:500080 nanoseconds.
- the local end receives the response packet.
- the time RxTimeb when the local end receives the response packet is 17:10:27:60 nanoseconds, and the formula is:
- Dual-Delay (RxTimeb - TxTimeStampf) -(TxTimeStampb - RxTimeStampf) Calculates the bidirectional frame delay Dual-Delay.
- the Dual-Delay is calculated to be 20 seconds and 20 nanoseconds.
- the step s302 is repeated according to the preset number of times, and the peer sends the response packet according to the time when the multiple peers send the response packet, the time when the local end receives the response packet, and the unidirectional frame delay.
- the average of the time in response to the 4th message, the average of the time when the local end receives the response, and the average delay of the unidirectional frame are included:
- n is assumed to be 20.
- TxTimeStampbaver ( TxTimeStampb i + TxTimeStampb 2 +... TxTimeStampb n )
- TxTimeStampb avCT is the average value of the time when the peer sends a response message
- TxTimeStampbi is the peer obtained each time Time when the response message is sent; assumed to be calculated in this embodiment
- TxTimeStampb aver is 17:10:17 and 500080 nanoseconds.
- RxTimebaver ( RxTimeb 1+ RxTimeb 2 +... RxTimeb n ) ⁇ n, calculate the average value of the time when the local end receives the response message, where RxTimeb avCT is the average of the time when the local end receives the response message.
- the value, RxTimebi, ... RxTimeb n is the time when the local end receives the response message every time; in this embodiment, it is assumed that the calculated RxTimeb avCT is 17:10:27. 60 nanoseconds.
- Delay aver (Single-Delayi+ Single-Delay 2 + ... Single-Delay n ) ⁇ n, calculate the unidirectional frame average delay, where Delay aver is the unidirectional frame average delay, Single-Delay l ... Single-Delay n is the unidirectional frame delay obtained each time; in this embodiment, it is assumed that the Delay aver is calculated to be 10 seconds and 10 nanoseconds. The sum is subtracted from the average of the time when the local end receives the response, and the time correction value is obtained.
- Minus ( RxTimebaver - (TxTimeStampb aver + Delay aver ), the time correction value Minus is calculated, and in this embodiment, the calculated Minus is -500030 nanoseconds.
- Step s305 The local end acquires the local current time, and corrects the local current time according to the time correction value. Specifically, the following steps are included:
- the local end obtains the local current time T.
- the setting of ⁇ is 17:10:28:30 nanoseconds.
- T S T -Minus
- T s the corrected local current time
- T the local current time before correction
- Minus the time correction value.
- the calculated T s is 17:10:28,500060 nanoseconds.
- Step s306 Initiate two-way network delay measurement at the opposite end, and repeat steps s302 ⁇ s305 to correct the local current time of the peer end.
- the accuracy reaches nanosecond level, which can meet the accuracy requirement of the measurement of the unidirectional frame delay in the Y.1731 protocol, so the ONE-DM function can be used in the application.
- the specific process is as follows: First, the local end sends a message to the peer end, where the message carries the time TxTimeStampf when the local end sends the message; then, the peer end receives the message, and the time when the opposite end receives the message RxTimef minus the time TxTimeStampf sent by the local end, To the one-way frame delay Frame Delay.
- a device for performing clock synchronization between devices in the embodiment of the present invention includes: a coarse synchronization unit, a bidirectional network delay measurement unit, an average value acquisition unit, a time correction value acquisition unit, a correction unit, and a single a network delay measurement unit; wherein, the two-way network delay measurement unit is respectively connected to the coarse synchronization unit and the average value acquisition unit, and the time correction value acquisition unit is respectively connected with the average value acquisition unit and the correction unit, and the correction unit and the one-way network The measurement unit is connected.
- the coarse synchronization unit is configured to perform coarse synchronization on the clock between the local end and the opposite end by using a network clock protocol, and the precision of the coarse synchronization is accurate to the second level;
- the two-way network delay measurement unit is used to initiate the two-way network delay at the local end. The measurement, the time when the peer sends the response packet, the time when the local end receives the response, and the bidirectional frame delay, and the half of the bidirectional frame delay is used as the unidirectional frame delay;
- the unit is configured to obtain an average value of time when the peer sends the response packet according to the time when the response packet is sent by the peer, the time when the local end receives the response packet, and the unidirectional frame delay.
- the unidirectional network delay measurement unit is configured to perform one-way network delay measurement to obtain a unidirectional frame after the local current time of the local end and/or the opposite end is corrected. Delay.
- the invention calculates the delay between the devices by using the TWO-DM function of the Y.1731 protocol, and obtains the unidirectional frame average delay between the devices, and corrects the local current time and the unidirectional frame average delay of the device.
- the local current time thus achieving clock synchronization between devices, the clock synchronization accuracy is high, and can be accurate to the nanosecond level.
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- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Cardiology (AREA)
- General Health & Medical Sciences (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
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RU2012154446/08A RU2526278C2 (ru) | 2010-05-19 | 2011-03-28 | Способ и устройство для осуществления синхронизации часов между устройствами |
BR112012029147A BR112012029147A2 (pt) | 2010-05-19 | 2011-03-28 | método para realizar a sincronização do tempo entre dispositivos e aparelho para a realização de sincronização de tempo entre dispositivos |
JP2013510486A JP5636093B2 (ja) | 2010-05-19 | 2011-03-28 | デバイス間におけるクロック同期の実行方法及び装置 |
EP11782890.5A EP2573974B1 (en) | 2010-05-19 | 2011-03-28 | Method and apparatus for performing clock synchronization among devices |
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JP (1) | JP5636093B2 (zh) |
CN (1) | CN101848051B (zh) |
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CN101848051B (zh) * | 2010-05-19 | 2015-04-01 | 中兴通讯股份有限公司 | 一种设备之间进行时钟同步的方法和装置 |
CN103428844A (zh) * | 2012-05-17 | 2013-12-04 | 上海闻泰电子科技有限公司 | 手机终端手机时间同步的实现方法 |
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CN113409880A (zh) * | 2020-03-17 | 2021-09-17 | 铠侠股份有限公司 | 半导体装置以及半导体储存装置 |
CN113409880B (zh) * | 2020-03-17 | 2023-07-28 | 铠侠股份有限公司 | 半导体装置以及半导体储存装置 |
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JP2013532413A (ja) | 2013-08-15 |
EP2573974B1 (en) | 2018-05-09 |
EP2573974A4 (en) | 2017-01-25 |
JP5636093B2 (ja) | 2014-12-03 |
RU2526278C2 (ru) | 2014-08-20 |
RU2012154446A (ru) | 2014-06-27 |
EP2573974A1 (en) | 2013-03-27 |
BR112012029147A2 (pt) | 2017-12-12 |
CN101848051A (zh) | 2010-09-29 |
CN101848051B (zh) | 2015-04-01 |
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