WO2014032350A1 - Procédé et nœud basés sur un réseau en anneau redondant sans rupture pour augmenter la précision d'horloge - Google Patents

Procédé et nœud basés sur un réseau en anneau redondant sans rupture pour augmenter la précision d'horloge Download PDF

Info

Publication number
WO2014032350A1
WO2014032350A1 PCT/CN2012/082004 CN2012082004W WO2014032350A1 WO 2014032350 A1 WO2014032350 A1 WO 2014032350A1 CN 2012082004 W CN2012082004 W CN 2012082004W WO 2014032350 A1 WO2014032350 A1 WO 2014032350A1
Authority
WO
WIPO (PCT)
Prior art keywords
clock
clock information
node
time
synchronization
Prior art date
Application number
PCT/CN2012/082004
Other languages
English (en)
Chinese (zh)
Inventor
黄剑超
马化一
Original Assignee
北京东土科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 北京东土科技股份有限公司 filed Critical 北京东土科技股份有限公司
Publication of WO2014032350A1 publication Critical patent/WO2014032350A1/fr

Links

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
    • H04J3/0658—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H04L12/42—Loop networks
    • 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
    • H04J3/0673—Clock or time synchronisation among packet nodes using intermediate nodes, e.g. modification of a received timestamp before further transmission to the next packet node, e.g. including internal delay time or residence time into the packet

Definitions

  • the present invention relates to the field of ring networks, and in particular, to a method and a section for improving clock accuracy based on a seamless redundant ring network
  • RSTP Spanning Tree Protocol
  • MSTP Multiple Spanning Tree Protocol
  • IEEE 802. lw these two protocols can be applied to loops.
  • the network implements path redundancy through a certain algorithm, and at the same time prunes the loop network into a loop-free tree network.
  • IEC 62439 protocol of which IEC 62439-2 Media Redundancy Protocol (MRP)
  • MRP Media Redundancy Protocol
  • PRP Parallel Redundancy Protocol
  • the content of the protocol of the Seamless Automation Ring is mainly to send data frames from two ports of a node of the ring network to the ring network, and the data frames sent from one port are terminated on the other port of the node. Transmission, thereby enabling seamless transmission of data frames in a ring network.
  • each node receives two identical data frames, thus causing a waste of transmission paths in the ring network, and fixing the redundant ports of each node also causes the nodes to be used. Waste of port resources.
  • a node in the ring network sends a data frame to two ports located in the ring network respectively, when two data frames reach a certain node in the ring network, The node no longer forwards the data frame, that is, the data frame terminates at a node in the ring network.
  • the Accurate Clock Protocol (IEEE1588 protocol) implements accurate clock synchronization in measurement and control systems implemented in technologies such as network communications, local computing, and distributed objects.
  • nodes 1, 2, and 3 are seamlessly redundant.
  • the nodes in the network, 1A and 1B are the ring ports of node 1
  • 2A and 2B are the ring ports of node 2
  • 3A and 3B are the ring ports of node 3
  • the external ports of node 1 are connected to the master clock of the precision clock protocol
  • node 3 The external port is connected to the slave clock of the precision clock protocol.
  • the master clock can send synchronous clock information to the connected node (node 1), and the node 1 carries the received synchronous clock information in the ring network message and forwards it to the adjacent node.
  • the node 3 forwards the synchronous clock information to the slave clock, and the slave clock performs clock synchronization according to the synchronous clock information.
  • the existing precise clock protocol indicates that in a seamless redundant ring network, each node transmits a ring network message carrying synchronous clock information only as a transparent clock instead of a boundary clock, and each node only synchronizes clock information or carries The ring network packet with the synchronous clock information is forwarded.
  • the node receives and forwards the synchronous clock information or the ring network packet carrying the synchronous clock information has a certain time delay.
  • the prior art proposes A fixed correction value is preset, and each node uses the correction value to correct the synchronization clock information.
  • the time delay is uncertain. If the fixed correction value is used to correct the synchronous clock information, It will cause a large synchronization error in the synchronization of the master and slave clocks. If the accuracy of the error is in the us level, the result will have a us-level effect on the precision of the precision clock protocol. For many clock synchronizations requiring us-level precision. Application scenarios can have a big impact.
  • the embodiments of the present invention provide a method and a node for improving clock precision based on a seamless redundant ring network, which are used to solve the problem in the prior art that each node receives and forwards synchronous clock information or carries a synchronous clock.
  • the time delay of the time is uncertain, which leads to a large synchronization error of the master-slave clock.
  • a method for improving clock accuracy based on a seamless redundant ring network including:
  • the node in the seamless redundant ring network After receiving the synchronization clock information sent by the adjacent node or the master clock, the node in the seamless redundant ring network determines the resident duration of the received synchronization clock information in the local node, and the resident duration is synchronization. The length of time between the point in time when the clock information is input to the ingress port and the time point from the output to the egress port;
  • the modified synchronization clock information is forwarded to the adjacent node through the ring port. If the egress port is an external port, the modified synchronization clock information is forwarded to the external port.
  • the slave clock so that the slave clock is clocked according to the synchronous clock information.
  • a node in a seamless redundant ring network including:
  • a receiving unit configured to receive synchronous clock information sent by an adjacent node or a master clock
  • a dwell duration determining unit configured to determine a dwell duration of the synchronization clock information received by the receiving unit in the local node, where the dwell time is a time from the input to the ingress port to the output to the egress port Length of time between points;
  • a synchronous clock correcting unit configured to correct the received synchronous clock information according to the resident duration determined by the resident duration determining unit
  • a forwarding unit configured to: when the egress port is a ring port, forward the corrected synchronization clock information to the adjacent node by using the ring port, and when the egress port is an external port, pass the external port
  • the corrected synchronous clock information is forwarded to the slave clock so that the slave clock performs clock synchronization based on the synchronous clock information.
  • the method for improving the clock precision based on the seamless redundant ring network because each node respectively determines the time delay of receiving and forwarding the synchronous clock information or the ring network carrying the synchronous clock information, Then, according to the determined time delay, the received synchronous clock information is corrected and then forwarded, instead of using a fixed correction value to correct the synchronous clock information, thereby effectively reducing the synchronization error of the master-slave clock and improving the master. Synchronization accuracy from the clock.
  • FIG. 1 is a schematic structural view of a seamless redundant ring network in the prior art
  • FIG. 2 is a schematic flowchart of a method for improving clock precision based on a seamless redundant ring network according to Embodiment 1 of the present invention
  • FIG. 3 is a flowchart showing a duration of synchronization clock information in a node according to Embodiment 2 of the present invention
  • FIG. 4 is a schematic flowchart of clock frequency synchronization of a local clock of a node according to Embodiment 3 of the present invention
  • FIG. 5 is a schematic structural diagram 1 of a node in a seamless redundant ring network according to Embodiment 4 of the present invention
  • 5-2 is a second schematic structural diagram of a node in a seamless redundant ring network according to Embodiment 4 of the present invention
  • FIG. 6 is a third schematic structural diagram of a node in a seamless redundant ring network according to Embodiment 5 of the present invention. detailed description
  • the structure of the seamless redundant ring network is shown in Figure 1.
  • the seamless redundant ring network includes several nodes (node 1, node 2, and node 3 in Figure 1).
  • the nodes included in the seamless redundant ring network are not limited to the three nodes in Figure 1, but also the chain network composed of two nodes is also called the seamless redundant ring network.
  • the seamless redundancy The ring network includes both the HSR network and the ASR network, and can also be extended to the seamless redundant ring network type not listed.
  • Each node in the seamless redundant ring network is connected by a link.
  • the external port of node 1 is connected to the master clock, and the external port of node 3 is connected to the slave clock.
  • the master clock can be connected to the node 2 or 3 in the ring network.
  • which node is connected from the clock can also be based on The actual needs of the project implementation are deployed.
  • Each node (such as node 1, node 2, and node 3 in Figure 1) is connected through a ring port.
  • FIG. 2 it is a flow chart of a method for improving clock precision based on a seamless redundant ring network according to Embodiment 1 of the present invention.
  • the method includes the following steps:
  • Step 21 After receiving the synchronization clock information sent by the adjacent node or the master clock, the node in the seamless redundant ring network determines the resident duration of the received synchronization clock information in the local node, where the resident The duration is the length of time between the point in time when the synchronous clock information is input to the ingress port and the time point from the output to the egress port.
  • the synchronous clock information is transmitted between the master clock and the node, and the synchronous clock information is also transmitted between the slave clock and the node, and the ring network packets carrying the synchronous clock information are transmitted between the nodes, that is, the synchronization information is carried in the ring network report.
  • the master clock sends the synchronous clock information to the connected node through the external port, and the node connected to the master clock receives the synchronous clock information, and then corrects the synchronous clock information, and carries the modified synchronous clock information in the ring network message.
  • the node If the node is not connected to the slave clock, it will be corrected.
  • the subsequent synchronous clock information is carried in the ring network message and sent to the adjacent node. If the slave node is connected to the slave clock, the modified synchronous clock information is sent to the slave clock.
  • the ingress port of the node receiving the synchronous clock information may be an external port or a ring port. If the ingress port is an external port, it indicates that the node has a master clock connected through the external port, and the outbound port is a ring port, that is, the node passes through the ring.
  • the port forwards the ring network carrying the synchronous clock information to the adjacent node; if the ingress port is a ring port, the egress port is both It can be a ring port or an external port.
  • the egress port is a ring port, it indicates that the node is not connected to the master clock and the slave clock.
  • the node forwards the ring network packet carrying the synchronous clock information to the adjacent node through the ring port.
  • the egress port is an external port, it indicates that the node is connected to the slave clock through the external port, and the node forwards the synchronous clock information to the slave clock through the external port.
  • a node connected to the master clock may be referred to as an originating node, and a node connected to the slave clock may be referred to as a receiving node, and then other nodes may be referred to as intermediate nodes.
  • node 1 is the originating node
  • node 3 is the receiving node
  • node 2 is the intermediate node.
  • the originating node receives the synchronous clock information sent by the master clock through the external port, and forwards the ring network message carrying the synchronous clock information to the adjacent node through the two ring ports respectively, and the intermediate node receives the sent by the neighboring node through the ring port.
  • the ring network packet forwards the ring network packet to the neighboring node through another ring port.
  • the receiving node receives the ring network packet sent by the neighboring node through the ring port, and forwards the synchronous clock information to the slave clock through the external port.
  • the duration of the synchronization clock information received by the node in the node can also be regarded as the time delay when the node receives and forwards the synchronization clock information or the ring network message carrying the synchronization information.
  • the duration of the reservation specifically refers to the synchronization clock information. Enter the length of time between the point in time of the ingress port and the point in time when it is output to the egress port.
  • the ingress port is an external port
  • the originating node sends the ring network containing the synchronous clock information to the two ring ports simultaneously, that is, the egress port is two ring ports, and the synchronous clock
  • the length of time between the input of the information to the external port and the output to one of the ring ports is the same as the length of time between the synchronization clock information from the input to the external port and the output to the other ring port.
  • Step 22 Correct the received synchronous clock information according to the determined resident duration.
  • the received synchronous clock information is the uncorrected synchronous clock information sent by the master clock. If the node is not the originating node, the synchronous clock information carried in the received ring network message Synchronized clock information corrected for each node.
  • Step 23 If the egress port is a ring port, the modified synchronization clock information is forwarded to the adjacent node through the ring port, and if the egress port is an external port, the modified synchronization is performed through the external port.
  • the clock information is forwarded to the slave clock so that the slave clock is clocked according to the synchronous clock information.
  • the egress port is a ring port. At this time, the node forwards the ring network carrying the corrected synchronization clock information to the adjacent node through the ring port.
  • the egress port is an external port, and the node forwards the corrected synchronous clock information to the slave clock through the external port.
  • clock synchronization is performed according to the synchronous clock information, thereby realizing clock synchronization between the slave clock and the master clock.
  • the slave clock performs clock synchronization according to the synchronous clock information received first, and discards the subsequently received synchronous clock information.
  • the node in the seamless redundant ring network determines that the received synchronous clock information is The length of the dwell time in the node, the dwell time is the length of time between the time point of the synchronous clock information from the input to the ingress port to the time point of the output to the egress port, and the node corrects the receiving according to the determined dwell time.
  • the node forwards the corrected synchronous clock information to the adjacent node through the ring port, and if the outgoing port is an external port, the node passes the The external port forwards the corrected synchronous clock information to the slave clock, so that the slave clock synchronizes the clock according to the synchronous clock information.
  • Each node determines the time delay of receiving and forwarding the synchronous clock information or the ring network carrying the synchronous clock information, and then correcting the received synchronous clock information according to the determined time delay before forwarding. Instead of using a fixed correction value to correct the synchronous clock information, the synchronization error of the master-slave clock is effectively reduced, and the synchronization accuracy of the master-slave clock is improved.
  • the node may first obtain the first count value of the local clock when the synchronous clock information is input to the ingress port, and when the synchronous clock information is output to the egress port, the local The second count value of the clock is then determined according to the obtained first count value and second count value, and the clock frequency of the local clock, the duration of the synchronization clock information in the local node.
  • the local clock in the node is counted according to its own clock frequency.
  • the time point at which the node receives the synchronous clock information from the ingress port is ⁇ 1
  • the time point at which the synchronous clock information is output to the egress port is ⁇ 2.
  • the time point at which the node receives the synchronous clock information from the external port is ⁇ 1
  • the time at which the synchronous clock information is output to the ring port is ⁇ 2
  • the clock frequency of the local clock of the node is 125M, that is, The count is performed every 8 ns.
  • the first count value of the local clock is nl.
  • the node When the node is an intermediate node, the time point at which the node receives the ring network message carrying the synchronous clock information from the first ring port is T1, and the time point at which the synchronous clock information is output to the second ring port is ⁇ 2, the node The clock frequency of the local clock is 125 M, that is, every 8 ns is counted.
  • the first count value of the local clock is nl
  • the synchronous clock information is output to the second.
  • the clock of the local clock of the node Frequency is
  • the node determines the duration of the synchronization clock information in the local node according to the clock frequency of the local clock.
  • Embodiment 3 of the present invention It is proposed that each node can synchronize the clock frequency of the local clock before determining the resident duration. The method flow is shown in FIG. 4, and the specific processing flow is:
  • Step 41 Determine a deviation of a clock frequency between the local clock and the main clock according to the synchronous clock information received this time and the synchronous clock information received last time.
  • the master clock can periodically send synchronous clock information.
  • Step 42 Synchronize the clock frequency of the local clock according to the determined deviation of the clock frequency.
  • the node may first determine the time point corresponding to the synchronous clock information received this time, the time point corresponding to the last received synchronous clock information, the time point of receiving the synchronous clock information, and the last time receiving the synchronous clock information. At the time point, then based on the determined time points, the deviation of the clock frequency between the local clock and the main clock is calculated.
  • ⁇ is the deviation of the clock frequency between the local clock and the main clock
  • t2 is the time point corresponding to the received synchronous clock information
  • tl is the time point corresponding to the last received synchronous clock information
  • t2' For the time when the synchronous clock information is received, tl' is the time point when the synchronous clock information is received last time, and the deviation of the clock frequency between the local clock and the master clock is:
  • the node may record the timestamp corresponding to the time point when the inbound port receives the synchronization clock information, and then the node may directly receive the synchronization clock information according to the current time.
  • the method for synchronizing the clock frequency of the local clock proposed in Embodiment 3 of the present invention can realize that the clock frequencies of the local clocks of all the nodes in the seamless redundant ring network are synchronized (both with the clock frequency of the main clock) Therefore, the accuracy of the resident duration calculated by each node is effectively improved, and the synchronization precision of the master-slave clock is further improved.
  • each node periodically receives the synchronization clock information, and each time the synchronization clock information is received, not only the determination of the resident duration but also the correction of the synchronization clock information according to the resident duration is performed. Operation, but also to perform the operation of synchronizing the clock frequency of the local clock (except for the first time receiving the synchronous clock information), then the node can determine the resident according to the synchronized clock frequency after receiving the synchronous clock information next time. duration.
  • the node in the seamless redundant ring network includes the first CPU component, the second CPU component, the first ring port, and the second ring port, as shown in FIG. 5-1, where the first CPU The component is connected to the first ring port and the second ring port, and the first ring port and the second ring port are responsible for sending, receiving, and forwarding the ring network.
  • the first CPU component includes a packet forwarding module and a frequency synchronization module
  • the second CPU component includes a protocol processing module. among them:
  • the packet forwarding module receives and forwards the synchronization information or the ring network message carrying the synchronization information through the external port or the ring port, and determines the resident duration of the received synchronization clock information in the node, and according to the determined resident duration. , Correct the received synchronous clock information.
  • the protocol processing module is configured to process the ring network and calculate the deviation of the clock frequency between the local clock and the main clock, and then send the deviation of the clock frequency to the first CPU component, and synchronize the frequency in the first CPU component.
  • the module adjusts the clock frequency of the local clock.
  • the frequency synchronization module is configured to generate a local clock, and adjust the clock frequency of the local clock according to the deviation of the clock frequency provided by the protocol processing module, so that the local clock and the clock frequency of the main clock are synchronized.
  • the first CPU component of the node saves the time when the ingress port receives the synchronous clock information or the ring network message carrying the synchronous clock information, and the first CPU component saves the synchronous clock information to the outbound The time of the port, so that the duration of the dwell is determined based on the two times saved.
  • node 1 is an originating node, and a master clock connected to an external port of node 1 transmits synchronous clock information, and a first CPU component of node 1 stores a time at which the node receives the synchronous clock information from an external port.
  • the first CPU component of node 1 saves the time t2 at which the synchronous clock information is transmitted to its first ring port and the second ring port, and then subtracts t2 from the recorded t2 to be the resident time of the synchronous clock information in node 1. It should be noted that the first CPU component adds the corrected synchronization clock information to the ring network message for forwarding.
  • the method for improving the clock precision based on the seamless redundant ring network provides a node in the seamless redundant ring network, and the structure thereof is as shown in FIG. 6, which includes:
  • the receiving unit 61 is configured to receive synchronous clock information sent by an adjacent node or a master clock;
  • the resident duration determining unit 62 is configured to determine a duration of the synchronization clock information received by the receiving unit 61 in the local node, where the resident duration is a time point from the input to the ingress port to the output to the egress port. Length of time between points in time;
  • the synchronization clock correction unit 63 is configured to correct the received synchronization clock information according to the resident duration determined by the resident duration determining unit 62;
  • the forwarding unit 64 is configured to: when the egress port is a ring port, forward the corrected synchronization clock information to the adjacent node by using the ring port, and when the egress port is an external port, pass the external port The corrected synchronous clock information is forwarded to the slave clock so that the slave clock performs clock synchronization based on the synchronous clock information.
  • the receiving unit 61 is not only used to receive the synchronization clock information sent by the adjacent node or the master clock, but also can be used to receive the ⁇ ⁇ text through the external port and the ring port, and the received ⁇ ⁇ ⁇ can be the ring network ⁇ ⁇ , can also be used for other data.
  • the forwarding unit 64 is not only used to forward the synchronous clock information, but also can be used to forward the data through the external port and the ring port, and the forwarded message can be a ring network message or other data message.
  • the receiving unit 61 is configured to receive a ring network message that is sent by the neighboring node and that carries the synchronous clock information, and confirm the synchronous clock information carried in the received ring network message as an adjacent node. Synchronized clock information sent;
  • the forwarding unit 64 is configured to carry the modified synchronization clock information in the ring network, and forward the ring network carrying the corrected synchronization clock information to the adjacent node through the ring port.
  • the resident duration determining unit 62 specifically includes:
  • the count value obtaining sub-unit is configured to obtain a first count value of the local clock when the synchronous clock information is input to the ingress port, and a second count value of the local clock when the synchronous clock information is output to the egress port;
  • the dwell duration determining subunit is configured to obtain a first count value and a second count value obtained by the subunit according to the count value, and a clock frequency of the local clock, and determine a dwell duration of the synchronous clock information in the node.
  • the master clock periodically sends synchronous clock information
  • the nodes in the seamless redundant ring network further include:
  • the clock frequency deviation determining unit is configured to: before the resident duration determining unit 62 determines the resident synchronization clock information in the local node, according to the currently received synchronous clock information and the last received synchronous clock information. Determining a deviation of a clock frequency between the local clock and the master clock;
  • the clock frequency synchronization unit is configured to determine a deviation of the clock frequency determined by the occupancy clock frequency deviation determining unit and synchronize the clock frequency of the local clock.
  • the clock frequency deviation determining unit specifically includes:
  • a time point determining subunit configured to determine a time point corresponding to the synchronous clock information received this time, a time point corresponding to the last received synchronous clock information, a time point of receiving the synchronous clock information, and a last received synchronous clock Time point of information;
  • the clock frequency deviation determining subunit is configured to calculate a deviation of a clock frequency between the local clock and the main clock according to each time point determined by the time point determining subunit.
  • the nodes in the seamless redundant ring network further include:
  • a timestamp recording unit configured to: before the clock frequency deviation determining unit determines the deviation of the clock frequency between the local clock and the main clock, after receiving the synchronous clock information, record the time point at which the ingress port receives the synchronous clock information Corresponding timestamp;
  • the time point determining subunit is specifically configured to determine, according to the timestamp recorded by the timestamp recording unit when the synchronous clock information is received, the time point of receiving the synchronous clock information, and according to the last time the synchronous clock information is received.
  • the timestamp records the timestamp recorded by the unit to determine the point in time when the synchronous clock information was last received.
  • the receiving unit 61 The receiving unit 61, the resident duration determining unit 62, the synchronous clock correcting unit 63, the forwarding unit 64, and the first
  • the clock frequency deviation determining unit corresponds to the protocol processing module in the second CPU component
  • the clock frequency synchronization unit corresponds to the frequency synchronization module in the first CPU component.
  • 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.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Small-Scale Networks (AREA)

Abstract

L'invention concerne un procédé et un nœud basés sur un réseau en anneau redondant sans rupture pour augmenter la précision d'horloge. Lorsque l'information de synchronisation d'horloge transmis par un nœud adjacent ou par une horloge maîtresse est reçue par le nœud situé dans le réseau en anneau redondant sans rupture, le nœud détermine la durée de résidence de l'information de synchronisation d'horloge dans le nœud courant, ladite durée de résidence étant l'intervalle de temps entre un instant auquel l'information de synchronisation d'horloge est reçue en entrée à un port d'entrée, et l'instant auquel cette information d'horloge est fournie en sortie à un port de sortie. L'information de synchronisation d'horloge reçue est révisée en fonction de ladite durée de résidence déterminée. Si le port de sortie est un port de l'anneau, l'information de synchronisation d'horloge révisée est envoyé au nœud adjacent via le port de l'anneau, si le port de sortie est un port externe, l'information de synchronisation d'horloge révisée révisé est envoyé à une horloge asservie via le port externe, de manière à permettre à l'horloge asservie d'effectuer une synchronisation d'horloge sur la base de l'information de synchronisation d'horloge. La solution technique de la présente invention résout le problème lié à l'accroissement des erreurs de synchronisation entre l'horloge maîtresse et les horloges asservies.
PCT/CN2012/082004 2012-08-31 2012-09-26 Procédé et nœud basés sur un réseau en anneau redondant sans rupture pour augmenter la précision d'horloge WO2014032350A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201210320749.5 2012-08-31
CN201210320749.5A CN102833061B (zh) 2012-08-31 2012-08-31 基于无缝冗余环网的提高时钟精度的方法及节点

Publications (1)

Publication Number Publication Date
WO2014032350A1 true WO2014032350A1 (fr) 2014-03-06

Family

ID=47336041

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/082004 WO2014032350A1 (fr) 2012-08-31 2012-09-26 Procédé et nœud basés sur un réseau en anneau redondant sans rupture pour augmenter la précision d'horloge

Country Status (2)

Country Link
CN (1) CN102833061B (fr)
WO (1) WO2014032350A1 (fr)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103236894B (zh) * 2013-04-03 2016-08-03 北京东土科技股份有限公司 一种无缝冗余网络中时钟同步方法和装置
CN105530139B (zh) * 2014-09-28 2021-03-16 中兴通讯股份有限公司 一种1588设备自检方法及装置
CN105356962B (zh) * 2015-11-20 2018-05-04 上海联影医疗科技有限公司 环形网络系统及其节点时间同步方法
CN105491433B (zh) * 2015-12-03 2019-05-17 北京小鸟科技股份有限公司 基于1588v2协议的视频同步显示方法和装置及拼接显示系统
CN105591697B (zh) * 2016-01-20 2018-04-17 中国科学院上海光学精密机械研究所 高精度光纤时频环形组网系统和组网方法
CN105978652B (zh) * 2016-04-27 2018-02-13 刘巍 冗余以太网的同步对时设备、系统及方法
CN106130710B (zh) * 2016-06-29 2019-11-08 北京东土科技股份有限公司 一种时钟同步方法及系统
CN106506260A (zh) * 2016-10-17 2017-03-15 国电南瑞科技股份有限公司 一种基于hsr双向环网的报文时延测量及修正方法
CN106656716B (zh) * 2016-12-28 2019-08-20 中国人民解放军海军工程大学 具有公共时钟的环形网络拓扑结构
CN107359978A (zh) * 2017-07-03 2017-11-17 南京南瑞继保电气有限公司 一种基于数据转发延时测量的hsr/prp网络采样同步方法
CN107800529B (zh) * 2017-11-07 2020-10-20 北京飞利信电子技术有限公司 一种网络节点的时钟频率同步方法
CN110943795B (zh) * 2019-10-22 2021-05-14 清华大学 一种适用于总线通信系统的时间同步方法
CN112994819B (zh) * 2019-12-16 2023-02-03 华为技术有限公司 一种用于时钟同步的消息处理方法、时钟同步方法及装置
CN111817810B (zh) * 2020-05-25 2022-07-15 上海橙群微电子有限公司 时钟同步方法及无线网络设备、可读存储介质
CN111698076B (zh) * 2020-06-03 2023-05-30 河北工业大学 一种基于时间补偿的精确通信同步方法及系统
CN117063437A (zh) * 2021-04-08 2023-11-14 华为技术有限公司 一种时钟同步方法、相关装置以及设备
CN114401067A (zh) * 2021-12-24 2022-04-26 浙江中控技术股份有限公司 环网通讯的时间同步方法、可编程门阵列及环网通讯系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1964352A (zh) * 2006-09-22 2007-05-16 华为技术有限公司 一种提高时钟精度的方法和装置
CN101425890A (zh) * 2008-11-21 2009-05-06 中兴通讯股份有限公司 透传时钟的实现装置和方法
CN101827098A (zh) * 2010-03-31 2010-09-08 中兴通讯股份有限公司 时间同步的处理方法及装置
CN101867469A (zh) * 2010-06-10 2010-10-20 北京东土科技股份有限公司 一种精密同步时钟的实现方法
WO2012104326A1 (fr) * 2011-02-01 2012-08-09 Alcatel Lucent Capture automatique de composants de retard de réseau

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1964352A (zh) * 2006-09-22 2007-05-16 华为技术有限公司 一种提高时钟精度的方法和装置
CN101425890A (zh) * 2008-11-21 2009-05-06 中兴通讯股份有限公司 透传时钟的实现装置和方法
CN101827098A (zh) * 2010-03-31 2010-09-08 中兴通讯股份有限公司 时间同步的处理方法及装置
CN101867469A (zh) * 2010-06-10 2010-10-20 北京东土科技股份有限公司 一种精密同步时钟的实现方法
WO2012104326A1 (fr) * 2011-02-01 2012-08-09 Alcatel Lucent Capture automatique de composants de retard de réseau

Also Published As

Publication number Publication date
CN102833061B (zh) 2016-02-24
CN102833061A (zh) 2012-12-19

Similar Documents

Publication Publication Date Title
WO2014032350A1 (fr) Procédé et nœud basés sur un réseau en anneau redondant sans rupture pour augmenter la précision d'horloge
JP5792884B2 (ja) 通信ネットワークにおける時間配信のための方法、装置およびシステム
JP6214008B2 (ja) 時間認識デバイス間で時間情報を通信する方法および装置
US10158441B1 (en) Securing time between nodes
US9548831B2 (en) Synchronizing system, synchronizing method, first synchronizing device, second synchronizing device, and computer program
JP5377663B2 (ja) 通信システム、通信装置および時刻同期方法
JP5915379B2 (ja) 伝送装置および伝送方法
WO2017071521A1 (fr) Procédé, nœud, et système de détection de trajet de synchronisation d'horloge
JP2013104772A (ja) フレーム伝送装置及び同期方法
EP2448168A1 (fr) Procédé et système pour supporter un protocole de synchronisation temporelle dans un réseau de transport optique
WO2010057398A1 (fr) Dispositif et procédé de mise en oeuvre de transmission transparente d'horloge
WO2014187310A1 (fr) Procédé et appareil pour un réseau synchrone ptp
US11349587B2 (en) Generating a timestamp
WO2011012057A1 (fr) Procédé, appareil et système de synchronisation de message
Le et al. Evaluation of real-time ethernet with time synchronization and time-aware shaper using OMNeT++
JP6231453B2 (ja) 通信制御装置
US8861552B2 (en) Fault-tolerant self-stabilizing distributed clock synchronization protocol for arbitrary digraphs
EP2458757B1 (fr) Procédé de transmission de paquets de synchronisation IEEE 1588V2 sur Internet dans un mode lien par lien via des éléments de réseau à horloge transparente et dispositif d'aide associé
Moreira et al. IEEE 1588 Transparent Clock architecture for FPGA-based network devices
WO2017097034A1 (fr) Procédé et appareil de traitement d'estampille temporelle pour un message de temps dans un réseau de transport optique
US20110026654A1 (en) Network device of high-precision synchronization type, network system, and frame transfer method
JP2011071869A (ja) クロック同期方法及びパケット通信システム
JP6456776B2 (ja) 遅延揺らぎ吸収方法
JP2014519282A (ja) パケット経路の信号劣化の検出方法、装置及びシステム
JP2009239452A (ja) 送信タイミング変更型ネットワーク装置及びシステム

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 12883746

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 12883746

Country of ref document: EP

Kind code of ref document: A1