WO2014161213A1 - Procédé et appareil de synchronisation d'horloges dans un réseau redondant continu - Google Patents

Procédé et appareil de synchronisation d'horloges dans un réseau redondant continu Download PDF

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Publication number
WO2014161213A1
WO2014161213A1 PCT/CN2013/075089 CN2013075089W WO2014161213A1 WO 2014161213 A1 WO2014161213 A1 WO 2014161213A1 CN 2013075089 W CN2013075089 W CN 2013075089W WO 2014161213 A1 WO2014161213 A1 WO 2014161213A1
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WO
WIPO (PCT)
Prior art keywords
ptp
adjustment value
seamless redundant
adjustment
value set
Prior art date
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PCT/CN2013/075089
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English (en)
Chinese (zh)
Inventor
肖智中
薛百华
马化一
Original Assignee
北京东土科技股份有限公司
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Publication of WO2014161213A1 publication Critical patent/WO2014161213A1/fr

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Classifications

    • 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
    • H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master
    • 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

Definitions

  • the invention relates to a clock synchronization method and device in a seamless redundant network.
  • the application is filed on April 3, 2013, and the application number is 201310114333.1.
  • the invention name is "a clock synchronization party and device in a seamless redundant network.
  • the priority of the Chinese Patent Application the entire contents of which is incorporated herein by reference.
  • TECHNICAL FIELD The present invention relates to the field of seamless redundant network technologies, and in particular, to a clock synchronization method and apparatus in a seamless redundant network. BACKGROUND OF THE INVENTION A high availability seamless automatic ring has been added to the IEC62439-3 standard (High Availability Seamless)
  • the protocol content of the network The HSR network (also known as the seamless redundant network) specified in the content of the protocol consists of multiple dual-connected nodes. Each node has two ring access ports. Port), wherein when the source node sends a packet to the destination node, it first adds an HSR label to the duplicated message, and then simultaneously sends the duplicated message to the two ports of the destination node through the two ports. 4 ⁇ .
  • the destination node receives a packet from each port at different times, and the two received packets are the same packet, so that the destination node retains the first packet received and discards the packet. The second message received.
  • the Precision Timing Protocol (PTP) protocol implements clock synchronization by selecting one node as the master clock and the other nodes as the slave clock.
  • the master clock node periodically sends the master clock time to the slave clock node through the ⁇ ⁇ text, and after receiving the message from the clock node, the ⁇ adjustment value is calculated based on the master clock time, and the ⁇ adjustment is calculated according to the calculation. The value is adjusted to achieve synchronization with the primary clock node.
  • FIG. 1 a schematic diagram of a connection between a node and a node in a seamless redundant network, where node A is a master clock, node B is a slave clock, port A1 of node A is connected to port B1 of node B, and Port A2 of node A is connected to port B2 of node B.
  • Node A sends a PTP protocol message AB1 to port B1 of node B through port A1, and a port A2 of node A sends a PTP protocol message AB2 to port B2 of node B.
  • the length of the cable between port A1 and port B1 and the length of the cable between port A2 and port B2 will cause the node B to receive PTP packets from port B1 and port B2 at different times. AB1 and AB2.
  • the PTP protocol packet received is discarded, and the PTP protocol packet received is synchronized.
  • the PTP protocol received by Node B will be jittered, and the jitter level of different protocols received will be different. If the jitter level of the received PTP protocol is higher than the jitter of the received protocol, then the synchronization is based on the first received protocol packet.
  • Embodiments of the present invention provide a clock synchronization method and apparatus in a seamless redundant network, which are used to solve the problem of low synchronization accuracy of a master-slave node in the prior art.
  • a clock synchronization method in a seamless redundant network comprising:
  • the slave clock nodes in the seamless redundant network receive seamless redundancy through their different seamless redundant ports.
  • the seamless redundancy is determined according to the message identifier carried in the received seamless redundant packets. Whether the remaining message includes the message information; when the determination result is yes, the seamless redundant message including the message information is saved;
  • the stored seamless redundancy received by the different seamless redundant ports is parsed, and according to the parsed ⁇ message information, a set of ⁇ adjustment values corresponding to different seamless redundant ports is obtained;
  • a set of adjustment values is selected from the obtained set of adjustment values to adjust the local clock of the slave clock node.
  • a clock synchronization device in a seamless redundant network comprising:
  • a receiving unit for receiving seamless redundancy through different seamless redundant ports thereof
  • a determining unit configured to determine, according to the packet identifier carried in the seamless redundant packet received by the receiving unit, whether the seamless redundant packet includes the packet information
  • a saving unit configured to: when the determining result of the determining unit is yes, seamlessly including the information including the ⁇ message
  • the parsing unit is configured to parse the seamless redundancy received by the storage unit through different seamless redundant ports, and obtain corresponding seamless redundancy according to the parsed message information a set of ⁇ adjustment values for the remaining ports;
  • an adjusting unit configured to select a set of adjustment values from the set of adjustment values obtained by the parsing unit to adjust a local clock of the slave clock node.
  • FIG. 1 is a schematic diagram of a connection between a node ⁇ and a node B in a seamless redundant network;
  • FIG. 2 is a main flowchart of a clock synchronization method in a seamless redundant network according to Embodiment 1 of the present invention
  • FIG. 3 is a schematic diagram of connection between a GMC and a slave clock node in an actual application according to Embodiment 2 of the present invention
  • 4 is a specific flowchart of a method for clock synchronization in a seamless redundant network in practical applications according to Embodiment 2 of the present invention
  • FIG. 5 is a distribution diagram of an adjustment value interval according to Embodiment 2 of the present invention.
  • Embodiment 6 is a distribution state diagram of two sets of adjustment values provided by Embodiment 2 of the present invention.
  • FIG. 7 is a schematic structural diagram of a clock synchronization apparatus in a seamless redundant network according to Embodiment 3 of the present invention.
  • FIG. 8 is a schematic structural diagram of a clock synchronization system in a seamless redundant network according to Embodiment 4 of the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the problem of low synchronization accuracy of a master-slave node in the prior art, an embodiment of the present invention provides a scheme for clock synchronization in a seamless redundant network. The solution can save the seamless redundant packets containing the PTP packet information received by the different seamless redundant ports, and analyze the saved seamless redundancy 4 to obtain different correspondences respectively.
  • a set of PTP adjustment values of the seamless redundant port, and then a PTP adjustment value set is selected to adjust the local clock of the slave clock node, instead of directly receiving the seamless redundant message including the PTP message information.
  • the adjustment is performed according to the seamlessly received packet containing the PTP message information received first, so that the localization of the slave clock node can be realized according to a set of seamless redundancy that is less jittery.
  • the clock is adjusted to improve the accuracy of the master-slave clock synchronization adjustment.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • FIG. 2 it is a main flow diagram of a clock synchronization method in a seamless redundant network according to Embodiment 1 of the present invention, where the method includes the following steps:
  • Step 21 The slave clock nodes in the seamless redundant network respectively receive seamless redundant packets through different seamless redundant ports;
  • the master clock node sends the same seamless redundancy to the seamless redundant ports of the slave clock nodes through its different seamless ports at the same time. Due to external factors, it is sent separately for the master clock node. The same seamless redundancy 4, the slave clock nodes will be received from different seamless redundant ports at different times. Step 22: Determine, according to the packet identifier carried in the seamlessly redundant packet, whether the seamless redundant packet includes the packet information.
  • Step 23 When the determination result is yes, the seamless redundant message including the ⁇ message information is saved; wherein, when the determination result is no, the received seamless redundant message does not include the ⁇ message
  • the information is received, it is determined whether the slave clock node stores the seamless redundant message that is the same as the data information included in the received seamless redundant message. If the judgment result is yes, the seamlessness received will be received. Redundant packets are discarded.
  • Step 24 parsing the seamlessly redundant packets received by the different seamless redundant ports, and obtaining the adjusted values corresponding to different seamless redundant ports according to the parsed packet information.
  • the saved seamless redundancy received by the different seamless redundant ports may be collected at least once, and the seamless redundant packets are collected.
  • the analysis is performed, and further, the parsed message information is obtained, and a set of adjustment values corresponding to different seamless redundant ports is obtained.
  • Step 25 Select a set of adjustment values from the obtained set of adjustment values to adjust the local clock of the slave clock node.
  • a set of ⁇ adjustment values may be selected from the obtained ⁇ adjustment value set according to the distribution state information of the ⁇ adjustment values respectively included in each obtained ⁇ adjustment value set;
  • the method may include: determining, according to a preset adjustment value interval, an adjustment value interval to which the ⁇ adjustment value is included in each set of adjustment values, and then performing, for each ⁇ adjustment value set: from the ⁇ adjustment value set In the adjustment value interval to which the ⁇ adjustment value belongs, the candidate adjustment value interval having the largest ⁇ adjustment value is determined, and finally, from the determined candidate adjustment value interval, a candidate adjustment value interval having the smallest lower limit is selected.
  • the local clock of the slave clock node may be adjusted according to an average value of the adjusted values included in the selected set of values.
  • adjusting the local clock of the slave clock node according to the selected set of ⁇ adjustment values may be, but is not limited to, the above-mentioned processing manner.
  • the average value of the ⁇ adjustment value included in the selected ⁇ adjustment value set is adjusted in such a manner as to further improve the clock synchronization accuracy.
  • Adjusting the adjustment value may make the synchronization accuracy of the slave clock node lower.
  • Embodiments of the present invention are capable of seamlessly receiving ⁇ packet information received by different seamless redundant ports
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • FIG. 3 it is a schematic diagram of a connection between a GMC (Grandmaster Clock) and a slave clock node in an actual application according to Embodiment 2 of the present invention, wherein a seamless redundant port of the GMC (hereinafter referred to as a port) A1 is connected to port B1 of the slave clock node, and port A2 of the GMC is connected to port B2 of the slave clock node.
  • a seamless redundant port of the GMC hereinafter referred to as a port
  • the basic idea of the scheme is: Save multiple seamless redundant packets containing PTP message information received by port B1 and port B2 from the clock node, and save multiple seamless redundancy 4
  • the parsing is performed to obtain a PTP adjustment value set corresponding to the port B1 and the port B2 respectively, and according to the obtained distribution state information of the two PTP adjustment value sets, an actual PTP adjustment value is obtained for the local clock of the slave clock node. Adjustment.
  • FIG. 4 it is a specific flowchart of a clock synchronization method in a seamless redundant network in an actual application according to Embodiment 2 of the present invention, where the method specifically includes:
  • Step 41 The slave clock node in the seamless redundant network receives the seamless redundancy message through port B1 and port B2, respectively.
  • Step 42 Determine, according to the packet identifier that is received by the seamlessly redundant packet, whether the PTP packet information is included. If the determination is yes, go to step 43. If the result is no, go to step 47. ;
  • the seam redundancy message contains PTP 4 message information.
  • Step 43 Save the received seamless redundant packet containing the PTP packet information.
  • step 44 the stored seamless redundancy received by the port B1 and the port B2 are collected at least once, and the seamless redundant packets are parsed and parsed according to the analysis.
  • the ⁇ message information is obtained, and the ⁇ adjustment value set corresponding to the port B1 and the port ⁇ 2 respectively is obtained;
  • the ⁇ adjustment value obtained by the parsing of the port B1 can be stored in the data area corresponding to the port B1, and the seamless redundancy received by the port ⁇ 2 is parsed.
  • the ⁇ adjustment value is stored in the data area corresponding to the port ⁇ 2, and the ⁇ adjustment values stored in the two data areas respectively constitute the ⁇ adjustment value set corresponding to the port B1 and the ⁇ adjustment value set corresponding to the port ⁇ 2.
  • Step 45 Select a set of adjustment values from the obtained set of adjusted values according to the distribution state information of the adjusted values respectively included in each obtained set of adjustment values;
  • FIG. 5 it is an adjustment value interval distribution diagram provided by an embodiment of the present invention.
  • the ⁇ adjustment value in the data area corresponding to the port B1 and the ⁇ adjustment value in the data area corresponding to the port ⁇ 2 are respectively corresponding to each adjustment value interval according to the preset adjustment value interval, and respectively determined for Port B1 contains the most adjusted value
  • the candidate adjustment value interval and the candidate adjustment value interval including the most PTP adjustment value for the port B2 then, in the above-mentioned determined candidate adjustment value intervals for the port B1 and the port B2, we consider that there is a minimum lower limit.
  • the PTP adjustment value included in the PTP adjustment value set corresponding to the candidate adjustment value interval is relatively stable, and the jitter range between the PTP adjustment value and the PTP adjustment value is small.
  • the preset adjustment value interval may be set according to the user's needs, and is not specifically limited herein.
  • the distribution state diagram of the set of values of the two PTPs wherein the abscissa is the number of adjustments, the ordinate is the PTP adjustment value, and each data point is obtained according to a seamlessly redundant message received.
  • a PTP adjustment value the hollow data point is a set of ⁇ adjustment value D1 obtained according to a set of seamless redundancy received by port B1, and the solid data point is a group received according to port ⁇ 2
  • a set of ⁇ adjustment values D2 obtained by seamlessly redundant messages. It can be seen more clearly from Figure 6 that D1 has a larger jitter range, and D2 has a smaller jitter range than D1, which indicates that D2 is more stable, so D2 is selected to adjust the local clock of the slave clock node.
  • Step 46 Adjust the local clock of the slave clock node according to an average value of the PTP adjustment values included in the selected PTP adjustment value set.
  • Step 47 For the seamless redundancy received by the different ports and containing the same data information, the seamless redundancy received first is saved, and the seamless redundancy received later is received. Discard.
  • the step may specifically include: determining whether the seamless redundant message that is the same as the data information included in the received seamless redundant message is stored, and when the determination result is yes, the received no Seated redundant packets are discarded.
  • Embodiments of the present invention are capable of seamlessly receiving ⁇ packet information received by different seamless redundant ports
  • the distribution state information of the adjustment value is selected as a set of adjustment values, and the local clock of the slave clock node is adjusted, instead of directly receiving the seamless redundant message containing the message information and receiving it first.
  • the seamless redundant packets including the ⁇ message information are adjusted, so that the local clock of the slave clock node can be adjusted according to a set of seamless redundant messages with less jitter.
  • the accuracy of the master-slave clock synchronization adjustment is selected as a set of adjustment values, and the local clock of the slave clock node is adjusted, instead of directly receiving the seamless redundant message containing the message information and receiving it first.
  • the local clock is adjusted according to the average value of the ⁇ adjustment values included in the selected ⁇ adjustment value set, which further prevents the sudden jitter of a set of seamless redundancy in the selected jitter degree. , so that the determined average adjustment value is closer to the actual adjustment value, and the synchronization adjustment precision of the master-slave clock is further improved.
  • Embodiment 3 is a diagrammatic representation of Embodiment 3
  • the embodiment of the present invention further provides a clock synchronization device in a seamless redundant network.
  • the following functional modules are included:
  • the receiving unit 71 is configured to receive seamless redundancy respectively through different seamless redundant ports thereof;
  • the determining unit 72 is configured to determine, according to the packet identifier carried in the seamless redundancy packet received by the receiving unit 71, whether the seamless redundancy packet includes the packet information.
  • the saving unit 73 is configured to save the seamless redundancy information including the PTP message information when the determination result of the determining unit 72 is YES;
  • the parsing unit 74 is configured to parse the seamless redundant packets respectively received by the different seamless redundant ports saved by the saving unit 73, and obtain corresponding seamless redundancy according to the parsed ⁇ message information. a set of ⁇ adjustment values for the remaining ports;
  • the adjusting unit 75 is configured to select a set of adjustment values from the set of adjustment values obtained by the parsing unit 74 to adjust the local clock of the slave clock node.
  • the device may further include:
  • the determining unit 76 is configured to: when the determining result of the determining unit 72 is negative, determine whether the seamless redundant message that is the same as the data information included in the received seamless redundant message is stored;
  • the discarding unit 77 is configured to discard the received seamless redundant message when the determining result of the determining unit 76 is YES.
  • the parsing unit 74 may be specifically configured to:
  • the seamless redundancy received by the different seamless redundant ports is stored at least once, and the seamlessly redundant 4 files are parsed.
  • the adjusting unit 75 can be specifically configured to:
  • a set of ⁇ adjustment values is selected from the ⁇ adjustment value set obtained by the parsing unit 74, and the local clock of the slave clock node is adjusted according to the average value of the ⁇ adjustment values included in the selected ⁇ adjustment value set.
  • adjusting unit 75 is further specifically configured to:
  • a set of ⁇ adjustment values is selected from the obtained ⁇ adjustment value set.
  • it may include:
  • a first determining module configured to determine, according to a preset adjustment value interval, an adjustment value interval to which the ⁇ adjustment value respectively included in each set of adjustment values belongs;
  • a second determining module configured to perform, for each set of adjustment values: determining, from the adjustment value interval to which the ⁇ adjustment value included in the ⁇ adjustment value set belongs, a candidate adjustment value interval that includes the most ⁇ adjustment value;
  • the selection module is configured to select a set of adjustment values corresponding to the candidate adjustment value interval having the smallest lower limit.
  • Embodiment 4 is a diagrammatic representation of Embodiment 4:
  • the embodiment of the present invention further provides a clock synchronization system in a seamless redundant network, as shown in FIG. 8, which specifically includes: a master clock node 81 and a slave a clock node 82; wherein, the master clock node 81 is configured to respectively send seamless redundancy to different seamless redundant ports of the slave clock node 82; the slave clock node 82 is used for different seamless redundancy
  • the remaining ports respectively receive the seamless redundant packets sent by the primary clock node 71; and determine whether the seamless redundant packets contain the ⁇ message information according to the received packet identifiers of the seamless redundant packets; If yes, save the seamless redundant message containing the message information; save and save Parsing seamless redundant packets received by different seamless redundant ports, and obtaining PTP adjustment value sets corresponding to different seamless redundant ports according to the parsed PTP message information;
  • a set of PTP adjustment values is selected from the set of PTP adjustment values to adjust the local clock of the slave clock node 82.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present invention can be embodied in the form of a computer program product embodied on one or more computer-usable storage interfaces (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.
  • computer-usable storage interfaces including but not limited to disk storage, CD-ROM, optical storage, etc.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

L'invention concerne un procédé et un appareil de synchronisation d'horloges dans un réseau redondant continu, de façon à résoudre le problème dans l'état antérieur de la technique selon lequel la précision de synchronisation entre une horloge de nœud primaire et une horloge de nœud secondaire est faible. Le procédé comprend les opérations suivantes : un nœud d'horloge secondaire dans un réseau redondant continu reçoit séparément un paquet redondant continu par l'intermédiaire de différents ports redondants continus du nœud d'horloge secondaire; déterminer, selon un identificateur de paquet véhiculé par le paquet redondant continu reçu, si chaque paquet redondant continu comprend ou non des informations de paquet PTP; si un résultat de détermination est oui, stocker les paquets redondants continus comprenant les informations de paquet PTP; analyser les paquets redondants continus stockés reçus par l'intermédiaire de différents ports redondants continus, et obtenir des ensembles de valeurs d'ajustement PTP correspondant aux différents ports redondants continus selon les informations de paquet PTP obtenues par analyse; et sélectionner un ensemble de valeurs d'ajustement PTP parmi les ensembles de valeur d'ajustement PTP obtenus pour ajuster une horloge locale du nœud d'horloge secondaire.
PCT/CN2013/075089 2013-04-03 2013-05-02 Procédé et appareil de synchronisation d'horloges dans un réseau redondant continu WO2014161213A1 (fr)

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CN201310114335.1A CN103236894B (zh) 2013-04-03 2013-04-03 一种无缝冗余网络中时钟同步方法和装置
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CN113556221A (zh) * 2020-04-23 2021-10-26 西门子股份公司 冗余网络中校时的方法及装置
CN114039695A (zh) * 2021-12-24 2022-02-11 浙江中控技术股份有限公司 冗余网络的时间同步方法、冗余网络系统及设备

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CN102833061A (zh) * 2012-08-31 2012-12-19 北京东土科技股份有限公司 基于无缝冗余环网的提高时钟精度的方法及节点
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