WO2013056575A1 - 一种1588-2008协议中时钟同步的方法及系统 - Google Patents

一种1588-2008协议中时钟同步的方法及系统 Download PDF

Info

Publication number
WO2013056575A1
WO2013056575A1 PCT/CN2012/078254 CN2012078254W WO2013056575A1 WO 2013056575 A1 WO2013056575 A1 WO 2013056575A1 CN 2012078254 W CN2012078254 W CN 2012078254W WO 2013056575 A1 WO2013056575 A1 WO 2013056575A1
Authority
WO
WIPO (PCT)
Prior art keywords
packet
clock
clock device
ptp
ptp packet
Prior art date
Application number
PCT/CN2012/078254
Other languages
English (en)
French (fr)
Inventor
白磊
罗丽
傅小明
Original Assignee
中兴通讯股份有限公司
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 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Priority to EP12842457.9A priority Critical patent/EP2770678A4/en
Publication of WO2013056575A1 publication Critical patent/WO2013056575A1/zh

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/02Details
    • H04J3/06Synchronising arrangements
    • H04J3/0635Clock or time synchronisation in a network
    • H04J3/0685Clock or time synchronisation in a node; Intranode synchronisation
    • H04J3/0697Synchronisation in a packet node
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/02Details
    • H04J3/06Synchronising arrangements
    • H04J3/0635Clock or time synchronisation in a network
    • H04J3/0638Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658Clock or time synchronisation among packet nodes
    • H04J3/0661Clock or time synchronisation among packet nodes using timestamps
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04JMULTIPLEX COMMUNICATION
    • H04J3/00Time-division multiplex systems
    • H04J3/02Details
    • H04J3/06Synchronising arrangements
    • H04J3/0635Clock or time synchronisation in a network
    • H04J3/0638Clock or time synchronisation among nodes; Internode synchronisation
    • H04J3/0658Clock or time synchronisation among packet nodes
    • H04J3/0661Clock or time synchronisation among packet nodes using timestamps
    • H04J3/0667Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a method and system for clock synchronization in the 1588-2008 protocol.
  • BACKGROUND Currently, base station requirements for clock synchronization and time synchronization can be met by various means, including: physical clock (such as external clock input, synchronous Ethernet, etc.), packet recovery clock (such as 1588v2, etc.). Compared with traditional timing technology, IEEE1588v2 has obvious advantages.
  • IEEE1588v2 uses a bidirectional channel with an accuracy of ns, low cost, and can adapt to different access environments. In the context of the industry that constantly demands increased precision, 1588 has become an inevitable trend of development.
  • IEEE 1588v2 is a master-slave synchronization system.
  • the master clock device periodically sends PTP (Precision Time Protocol) packets to advertise the time synchronization protocol and time information, and receives the master from the clock device port.
  • PTP Precision Time Protocol
  • the timestamp information sent by the clock device port the system calculates the master-slave line time delay and the master-slave time difference, and uses the time difference to adjust the local time, so that the slave device time maintains the frequency and phase consistent with the master device time.
  • IEEE1588 can achieve both frequency synchronization and time synchronization.
  • the accuracy guarantee of time transfer mainly depends on two conditions: counter frequency accuracy and link symmetry.
  • the text average interval field is used to perform link quality detection and is also applied in the synchronization algorithm. Table 1
  • Data set in a multicast message and 7F16 in a unicast message.
  • the value of the synchronization packet in the same data set is the same as that in the port data set.
  • the value is 0x7F when unicast.
  • the value of the multicast request is the same as the minimum average interval of the delayed request packets in the port data set. The value is 0x7F for unicast.
  • Equal delay "" response with the report f) When the actual use of 1588 for clock synchronization or time synchronization, you can take the multicast mode or unicast mode. As shown in Table 1, the logMessagelnterval can be carried in its common header when communicating in multicast mode. When multicast communication is used, Announce (advertisement message), Sync (synchronization message), and follow in the PTP message. The interval between the up (following message) and the delay_Resp (delay response message) is filled in the common header to notify the other party.
  • the logMessagelnterval field of Announce (advertisement message), Sync (synchronization message), follow up (follow message), and Delay Resp (Phase response message) in PTP message can be passed in signaling (Signaling packet)
  • the message negotiation determines that the sending interval of the packet sent by the peer master clock device can be obtained from the clock device during the handshake process.
  • the signaling negotiation mechanism is an optional mechanism. It is not necessary to enable the mechanism. Therefore, in certain scenarios, many devices enable the unicast non-negotiation mechanism.
  • the logMessagelnterval field in the common header of Sync, follow up Delay Resp is fixedly padded to 7F16.
  • the slave clock device In the current IEEE Std 1 588TM-2008 standard protocol, when the unicast communication is not enabled, the slave clock device cannot accurately obtain the value of the logMessagelnterval field of each packet sent by the master clock device. The interval for sending PTP packets is accurately obtained. In this case, the slave clock device cannot accurately perform link quality detection and control of the synchronization algorithm. This therefore results in clock synchronization of the slave clock's local clock and the slave clock's peer clock as well as time synchronization accuracy and accuracy.
  • the present invention provides a method and system for clock synchronization in the 1588-2008 protocol and a method and system for obtaining an actual interval of PTP messages in the 1588-2008 protocol, for use in the IEEE Std 1588TM-2008 standard protocol
  • the slave clock device can accurately obtain the value of the logMessagelnterval field of each packet sent by the master clock device, and then accurately obtain the interval for sending PTP packets.
  • the clock synchronization and time synchronization of the local clock of the slave clock device and the slave clock of the slave clock device are implemented.
  • a clock synchronization method in the 1588-2008 protocol, where the unicast mode does not enable the negotiation mechanism communication includes: receiving a PTP packet sent by the master clock device, and obtaining an average of the packets in the PTP packet An interval field value, where the packet average interval field value is used to identify an actual interval at which the primary clock device sends the PTP packet; and the primary clock device determines to send the PTP according to the packet average interval field value.
  • the clock link status between the slave clock device and the master clock device is detected by the actual interval of the PTP packet, which is specifically: the actual interval of the PTP packet and the received
  • the number of PTP packets is obtained as a packet loss rate.
  • the state of the clock link between the slave clock device and the master clock device is determined according to the packet loss rate.
  • the packet loss rate is obtained by using the actual interval of the PTP packet and the number of received PTP packets, and the specific clock interval is calculated according to the actual interval of the PTP packet.
  • the number of the first PTP packets sent; the number of the second PTP packets actually received by the master clock device in the set time; the number of the first PTP packets and the second PTP packet The number of texts is lost.
  • the determining, according to the packet loss rate, a clock link state between the slave clock device and the master clock device specifically: determining whether the packet loss rate exceeds a preset threshold, if not , then determine the slave The clock link between the clock device and the master clock device is in a connected state; if yes, determining that the clock link between the slave clock device and the master clock device is in a disconnected state.
  • the synchronizing operation is performed according to the clock link state to obtain synchronization information, and the local clock of the slave clock device is adjusted according to the synchronization information, specifically: if the slave clock device and the master clock device are determined The synchronization of the clock link between the two is enabled; the synchronization operation is enabled; the timestamp information in the PTP packet is obtained, and the synchronization information is obtained by using the obtained timestamp information to obtain synchronization information, and the synchronization information is used to Adjust from the local time of the clock device.
  • the synchronization information is a master, a time delay between the slave clock devices, and a time error.
  • the method for obtaining the actual interval of the PTP packet in the 1588-2008 protocol includes: the master clock device sends a PTP packet to the slave clock device, where the PTP packet includes an average interval field value of the packet, and the packet The average interval field value is used to identify the actual interval at which the primary clock device sends the PTP packet.
  • the PTP packet is received from the clock device, and the primary clock device sends the PTP packet according to the average interval field value of the packet in the PTP packet. The actual interval.
  • a clock synchronization system in the 1588-2008 protocol comprising: a receiving unit, configured to receive a PTP packet sent by a primary clock device, and obtain an average interval field value of the packet in the PTP packet, where the PTP The average interval field value of the packet in the packet is used to identify the actual interval at which the primary clock device sends the PTP packet.
  • the determining unit is configured to determine, according to the average interval field value of the packet, the actual PTP packet sent by the primary clock device.
  • a detecting unit configured to detect a clock link state between the slave clock device and the master clock device by using an actual interval of the PTP packet; and an acquiring unit configured to enable synchronization according to the clock link state The operation obtains synchronization information; and the adjusting unit is configured to adjust the slave clock device local clock according to the synchronization information, so that the slave clock device clock is synchronized with a clock between the master clock device.
  • the adjusting unit comprises: an information acquiring device, configured to obtain timestamp information according to the PTP message; and a synchronization operator, configured to obtain synchronization information by using the timestamp information and a synchronization operation.
  • a system for obtaining the actual interval of a PTP packet by the clock in the 1588-2008 protocol including: a master clock, configured to send a PTP packet to the slave clock device, where the PTP packet includes an average interval field value of the packet, and the report The average interval field value is used to indicate the actual interval at which the PTP packet is sent.
  • the slave clock is set to receive the PTP packet.
  • the actual interval of the packet is determined according to the average interval field value of the packet in the PTP packet. interval.
  • the actual interval of the PTP packet is detected by the actual interval of the PTP packet, and the clock link state between the slave clock device and the master clock device is detected, and synchronization information is obtained according to the state of the clock link, and according to the The synchronization information adjusts a local clock of the slave clock device to synchronize the local clock with a peer clock of the master clock device.
  • FIG. 1 is a flowchart of a method for obtaining an actual interval of a PTP packet in the 1588-2008 protocol according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of setting a packet interval in the 1588-2008 protocol according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a system for obtaining an actual interval of PTP packets in the 1588-2008 protocol according to an embodiment of the present invention
  • FIG. 4 is a flowchart of a method for clock synchronization in the 1588-2008 protocol according to an embodiment of the present invention
  • 5 is a schematic structural diagram of a clock synchronization system in the 1588-2008 protocol according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of an adjustment unit in a clock synchronization system in the 1588-2008 protocol according to an embodiment of the present invention.
  • the present invention provides a method for obtaining the actual interval of a PTP packet in the 1588-2008 protocol, in which the slave clock device can obtain the master when the signaling packet negotiation mechanism is not enabled in the unicast communication mode. Actual interval at which the clock device sends PTP packets.
  • the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
  • the embodiment of the present invention provides a method for obtaining an actual interval of a PTP packet in the 1588-2008 protocol.
  • the slave clock device can The specific process of obtaining the interval for sending PTP packets of the master clock device is as follows.
  • Step 101 The master clock device sends a PTP packet to the slave clock device, where the PTP packet includes an average interval value of the packet, and the average interval field value is used to identify the actual interval for sending the PTP packet.
  • the master clock device periodically sends PTP (Precision Time Protocol) packets to advertise the time synchronization protocol and time information.
  • PTP Precision Time Protocol
  • the PTP message sent by the master clock device to the slave clock device is such that the slave device can obtain the actual interval for sending the PTP message. Therefore, the PTP packet sent by the primary clock device includes a packet average interval field value, where the average packet interval field value is used to identify the actual interval at which the primary clock device sends the packet.
  • Step 102 Receive a PTP packet from the clock device, and determine an actual interval at which the primary clock device sends the PTP packet according to the average interval field value of the packet in the PTP packet.
  • the actual interval of the PTP packet sent by the master clock device is obtained according to the average interval field value of the packet in the PTP packet, and the actual interval of the PTP packet is received from the clock device.
  • the method for obtaining the actual interval of the PTP packet by the clock in the 1588-2008 protocol proposed in this application is described in detail below with reference to the specific application environment.
  • the setting of the value of the packet interval is set.
  • the value of the packet interval is set for the packet to be used in the clock synchronization process, and the specific settings are as follows:
  • the interval value of the Announce message is: The value of the portDS.logAnnouncelnterval member of the data set (the value of the interval interval of the advertisement packet in the same port data set is the same);
  • the value of the interval between the Sync message and the follow-up packet is: The value of the portDS.logSyncInterval member of the data set (the value is the same as the value of the synchronization packet interval field in the port data set. );
  • the value of the interval of the Delay Resp packet is: The value of the portDS.logMinDelayReqInterval member of the data set (the value is the same as the minimum average delay request packet interval field in the port data set);
  • the slave device obtains the average interval field value of Announce, Sync, follow up, and Delay_Resp in the PTP packet sent by the master clock device, and And determining, by using the average interval field value, an actual interval at which the primary clock device sends each PTP packet.
  • the master clock device sends a Sync to the slave clock device, where the Sync includes the Sync average interval field value, and after obtaining the Sync from the clock device, the actual interval of the Sync in the Sync average interval field value is read (ie, the master clock device sends The actual time interval between the first Sync and the second Sync).
  • the actual interval of Sync is then obtained from the clock device. As shown in FIG.
  • the method for obtaining the actual interval of the PTP packet in the 1588-2008 protocol provided by the embodiment of the present invention is provided, and the embodiment of the present invention further provides an actual PTP packet obtained in the 1588-2008 protocol.
  • Interval system including the following functional units.
  • the master clock 301 is configured to send a PTP packet to the slave clock device, where the PTP packet includes a packet average interval field value, and the packet average interval field value is used to indicate the actual interval for sending the PTP packet.
  • the slave clock 302 is configured to receive the PTP packet, and determine the actual interval at which the master clock device sends the PTP packet according to the average interval field value of the packet in the PTP packet.
  • the master clock device sends a PTP packet to the slave clock device, where the PTP packet includes the average interval field value of the packet, and the average interval of the packet is The field value is used to indicate the actual interval at which the PTP packet is sent.
  • the PTP packet is received from the clock device.
  • the actual interval of the PTP packet sent by the master clock device is determined according to the average interval field value of the packet in the PTP packet. Therefore, the value of the average packet interval field of each packet sent by the master clock device is accurately obtained, and the interval at which the master clock device sends the PTP packet is accurately obtained.
  • the present invention provides a clock synchronization method in the 1588-2008 protocol, in which the slave device can obtain the transmission interval of the PTP packet of the master clock device when the signaling packet negotiation mechanism is not enabled in the unicast communication mode.
  • the embodiment of the present invention provides a clock synchronization method in the 1588-2008 protocol.
  • the clock device receives the PTP packet sent by the master clock device, thereby The clock synchronization between the slave clock device and the master clock device is implemented.
  • the specific steps are as follows.
  • Step 401 Receive a PTP packet sent by the primary clock device, and obtain an average interval field value of the packet in the PTP packet, where the average interval field value of the packet is used to identify the primary clock device sending station.
  • the actual interval of the PTP packet Step 402: Determine an actual interval at which the primary clock device sends the PTP packet according to the packet average interval field value.
  • Step 403 Detect a clock link state between the slave clock device and the master clock device by using an actual interval of the PTP packet.
  • Step 404 Enable synchronization operation according to the clock link state to obtain synchronization information, and adjust a local clock of the slave clock device according to the synchronization information, so that the local clock and the peer clock of the master clock device are Synchronized.
  • the slave clock device determines the state of the clock link between itself and the master clock device according to the packet loss rate. Therefore, before the slave clock device detects the link state between itself and the master clock device, it needs to obtain the link loss ratio of itself and the master clock device.
  • the packet loss rate is obtained from the actual interval of the PTP packet and the number of received PTP packets.
  • the specific implementation method is: calculating, by the clock device, the number of the first PTP packets sent by the master clock device in the set time according to the actual interval of the PTP packet. The number of the first PTP packets is determined by the slave clock device.
  • the actual interval is expected to be the number of PTP packets sent by the master clock device in a preset time, and the number of second PTP packets sent by the master clock device is actually counted in the set time (the second PTP packet)
  • the number is the number of PTP packets sent by the master clock device that is actually received in the preset time period, and the packet loss rate is obtained by using the first PTP number and the second total number. After obtaining the packet loss rate of the link from the clock device, determining whether the packet loss rate exceeds a preset threshold. If not, the clock link between the slave clock device and the master clock device is kept in a link state; if yes, from The clock link between the clock device and the master clock device is disconnected.
  • the above method enables the slave clock device to accurately determine the quality status of the clock link through the packet loss rate of the clock link, and if it is determined that the clock link between the slave clock device and the master clock device is kept connected, Synchronous operation.
  • the slave device After the clock device detects that the clock link between the device and the master clock device is in a connected state, the slave device obtains timestamp information from the received PTP packet, and uses the timestamp to perform synchronization operation to obtain synchronization information.
  • the synchronization information is then applied to adjust the local time to synchronize the local clock with the clock of the master clock device.
  • the synchronization information is a time delay and a time error between the slave clock device and the master clock device. Referring to FIG.
  • the embodiment of the present invention further provides a system for clock synchronization in the 1588-2008 protocol, including the following functional units.
  • the receiving unit 501 is configured to receive a PTP packet sent by the master clock device, and obtain a packet average interval field value in the PTP packet, where the packet average interval field value is used to identify the master clock device. The actual interval at which the PTP packet is sent.
  • the determining unit 502 is configured to determine, according to the packet average interval field value, an actual interval at which the primary clock device sends the PTP packet.
  • the detecting unit 503 is configured to detect a clock link state between the slave clock device and the master clock device by using an actual interval of the PTP packet.
  • the obtaining unit 504 is configured to obtain synchronization information according to the clock link state enabling synchronization operation.
  • the adjusting unit 505 is configured to adjust the slave clock device local clock according to the synchronization information, so that the slave clock device clock is synchronized with a clock between the master clock devices.
  • FIG. 6 is a schematic structural diagram of the adjustment unit 505 in the system of the embodiment, where the adjustment unit 505 further includes.
  • the information acquirer 601 is configured to obtain timestamp information according to the PTP message.
  • the synchronization operator 602 is configured to obtain synchronization information by the time stamp information and the synchronization operation.
  • the technical effects of the technical solution of the present invention are as follows:
  • the PTP packet sent by the master clock device is received from the clock device, and the PTP is obtained.
  • the value of the average interval of the packets in the packet is used to identify the actual interval at which the primary clock device sends PTP packets.
  • the actual interval between the primary clock devices and the PTP packets is determined based on the average interval.
  • the clock link between the clock device and the master clock device is detected by the actual interval of the PTP packet.
  • the state obtains synchronization information according to the state of the clock link, and adjusts the local clock of the slave clock device according to the synchronization information to synchronize the local clock with the peer clock of the master clock device. Therefore, the slave clock device can accurately obtain each PTP packet sent by the master clock device, and can accurately obtain the value of the average packet interval field of each packet sent by the master clock device, thereby accurately obtaining the master clock device to send. The interval of the PTP packet is adjusted, and the local clock is adjusted through the obtained PTP packet. Finally, the clock synchronization between the local clock of the slave clock device and the peer clock of the master clock device is implemented. It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and the modifications of the invention.

Landscapes

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

Abstract

本发明公开了一种1588-2008协议中时钟同步的方法及系统。其中,该方法包括:当采用单播通信方式未启用信令报文协商机制情况下,从时钟设备接收主时钟设备发送来的PTP报文,并获取所述PTP报文中的报文平均间隔字段值,通过所述PTP报文的实际间隔检测从时钟设备与所述主时钟设备之间的时钟链路状态,根据所述时钟链路状态启用同步运算获得同步信息,并根据所述同步信息调整所述从时钟设备的本地时钟。通过本发明,能够从时钟设备能够精确地获取到主时钟设备发送各个报文的平均报文间隔字段的值,进而达到精确地获取到主时钟设备发送PTP报文的间隔,并通过获得的平均报文间隔字段值完成本地时钟的调整,最终实现从时钟设备本地的时钟与主时钟对端时钟的时钟同步的效果。

Description

一种 1588-2008协议中时钟同步的方法及系统 技术领域 本发明涉及通信技术领域, 尤其涉及一种 1588-2008协议中时钟同步的方法及系 统。 背景技术 目前, 基站对时钟同步和时间同步的要求, 可以通过多种手段来满足, 包括: 物 理时钟(如外时钟输入、 同步以太网等等), 包恢复时钟(如 1588v2等等)。 与传统授 时技术相比, IEEE1588v2有着明显的优势。 当采用单向信道的 GPS时间同步系统, 虽然同步信号的获得稳定可靠, 精度高, 但价格高(设备、 安装、 维护成本)、 施工难 度大 (基站放在地下室)、 失效率也高, 同时存在 安全风险。 IEEE1588v2采用双向信道, 精度为 ns级, 费用低, 能适应不同的接 入环境等等。在对精度不断要求提高的行业背景下, 1588已成为一种发展的必然趋势。
IEEE 1588v2作为一种主从同步系统, 在系统的同步过程中, 主时钟设备周期性 发送 PTP (精准时间协议, Precision Time Protocol ) 报文来发布时间同步协议及时间 信息, 从时钟设备端口接收主时钟设备端口发来的时间戳信息, 系统据此计算出主从 线路时间延迟及主从时间差, 并利用该时间差调整本地时间, 使从设备时间保持与主 设备时间一致的频率与相位。
IEEE1588可以同时实现频率同步和时间同步,时间传递的精度保证主要依赖于两 个条件: 计数器频率准确和链路的对称性。 此外, 对于从设备而言, 在整个时钟同步 过程中往往需要明确主设备发送各 PTP报文的时间间隔, 也即 1588v2协议中 PTP报 文头 common header (公共报文头) 中的 logMessagelnterval (报文平均间隔) 字段, 以此来进行链路的质量检测, 同时也会在同步算法中加以应用。 表 1
Message Type (报文类型) Value of logMessagelnterval (报文间
隔取值)
Announce (通告 ί艮文) The value of the
portDS .logAnnouncelnterval member of the data set (同端口数据集中的通告报 文间隔字段取值一致) Sync C同步报文), Follow Up The value of the
(跟随报文) portDS .logSyncInterval member of the
data set in a multicast message, and 7F16 in a unicast message (组播时取值 同端口数据集中的同步报文间隔字段 取值一致, 单播时取值为 0x7F )
Delay Resp (延迟响应报文) The value of the
portDS .logMinDelayReqlnterval
member of the data set in a multicast message, and 7F16 in a unicast message
(组播时取值同端口数据集中的延迟 请求报文最小平均间隔字段取值一 致, 单播时取值为 0x7F )
Delay Req (延迟请求报文) 7F16
Signaling (信令报文) 7F16
Management (管理报文) 7F16
Pdelay Req (对等延迟请求 7F16
报文)
Pdelay Resp (对等延迟响应 7F16
报文)
Pdelay Resp Follow Up (对 7F16
等延迟""响应 随报 f ) 在实际使用 1588进行时钟同步或时间同步时, 可以采取组播方式或单播方式。 从表 1中可以看出,在组播方式通信时其 logMessagelnterval可以携带在其 common header中, 当采用组播通信时, PTP报文中 Announce (通告报文)、 Sync (同步报文)、 Follow up (跟随报文)、 Delay_Resp (延迟响应报文)的发送间隔会填充在 common header 中来通知对方。 当采用单播协商机制通信时, PTP报文中 Announce (通告报文)、 Sync (同步报 文)、 Follow up (跟随报文)、 Delay Resp (延迟响应报文) 的 logMessagelnterval字段 可以通过在 signaling (信令报文) 消息协商来确定, 同时握手过程中从时钟设备可以 获取到对端主时钟设备发送报文的发送间隔。 此外, 在采用单播方式通信时, signaling协商机制为可选机制, 并非必须启用机 制, 因此在一定的场景下很多设备会启用单播非协商的机制。 在这种情形下, 由于 Sync、 Follow up Delay Resp的 common header中 logMessagelnterval字段固定填充为 7F16。 本申请人在实施本发明的过程中, 发现上述技术中至少存在如下技术问题: 目前的 IEEE Std 1 588TM-2008标准协议中单播通信未启用协商机制时, 从时钟设 备不能精确的获取到主时钟设备发送各个报文的 logMessagelnterval (平均报文间隔) 字段的值, 进而无法实时并精确得获取到 PTP报文的发送间隔, 在这种情况下从时钟 设备是无法精确的完成链路质量检测以及对同步算法的控制。 因此这会造成从时钟设 备的本地时钟与从时钟设备的对端时钟的时钟同步以及时间同步准确性和精确性。 发明内容 本发明提供了一种 1588-2008协议中时钟同步的方法及系统和一种 1588-2008协 议中获取 PTP报文的实际间隔的方法及系统, 用于在 IEEE Std 1588™-2008标准协议 中单播通信未启用协商机制时, 从时钟设备能够精确的获取到主时钟设备发送各个报 文的 logMessagelnterval (平均报文间隔)字段的值, 进而精确的获取到 PTP报文的发 送间隔, 进而实现从时钟设备的本地时钟与从时钟设备的对端时钟的时钟同步以及时 间同步。 一种 1588-2008协议中时钟同步的方法, 在单播方式未启用协商机制通信的情况 下, 包括: 接收主时钟设备发送来的 PTP报文, 并获取所述 PTP报文中的报文平均间 隔字段值, 其中所述报文平均间隔字段值用于标识所述主时钟设备发送所述 PTP报文 的实际间隔; 根据所述报文平均间隔字段值确定所述主时钟设备发送所述 PTP报文的 实际间隔; 通过所述 PTP报文的实际间隔检测所述从时钟设备与所述主时钟设备之间 的时钟链路状态; 根据所述时钟链路状态启用同步运算获得同步信息, 并根据所述同 步信息调整所述从时钟设备的本地时钟, 以使所述本地时钟与所述主时钟设备的对端 时钟之间同步。 优选的, 所述通过所述 PTP报文的实际间隔检测所述从时钟设备与所述主时钟设 备之间的时钟链路状态, 具体为: 通过所述 PTP报文的实际间隔以及接收到的 PTP报 文数量获得丢包率; 根据所述丢包率确定所述从时钟设备与所述主时钟设备之间的时 钟链路状态。 优选的,所述通过所述 PTP报文的实际间隔以及接收到的 PTP报文数量获得丢包 率, 具体为: 根据所述 PTP报文的实际间隔计算所述主时钟设备在设定时间内发送的 第一 PTP报文数; 统计在所述设定时间内实际接收所述主时钟设备发送来的第二 PTP 报文数; 通过所述第一 PTP报文数和所述第二 PTP报文数获得丢包率。 优选的, 所述根据所述丢包率确定所述从时钟设备与所述主时钟设备之间的时钟 链路状态, 具体为: 判断所述丢包率是否超过预设门限值, 如果不是, 则确定所述从 时钟设备与所述主时钟设备之间的时钟链路为保持连接状态; 如果是, 则确定所述从 时钟设备与所述主时钟设备之间时钟链路为断开连接状态。 优选的, 所述根据所述时钟链路状态启用同步运算获得同步信息, 并根据所述同 步信息调整所述从时钟设备本地时钟, 具体为: 如果确定所述从时钟设备与所述主时 钟设备之间的时钟链路为保持连接状态, 则启用同步运算; 获取 PTP报文中的时间戳 信息, 并利用获取到的时间戳信息进行同步运算获得同步信息, 并利用所述同步信息 对所述从时钟设备的本地时间进行调整。 优选的, 所述同步信息为主、 从时钟设备之间的时间延迟以及时间误差。 一种 1588-2008协议中获取 PTP报文的实际间隔的方法, 具体包括: 主时钟设备 向从时钟设备发送 PTP报文, 所述 PTP报文中包括报文平均间隔字段值, 所述报文平 均间隔字段值用于标识所述主时钟设备发送 PTP 报文的实际间隔; 从时钟设备接收 PTP报文,根据所述 PTP报文中的报文平均间隔字段值确定主时钟设备发送 PTP报文 的实际间隔。 一种 1588-2008协议中时钟同步的系统, 包括: 接收单元, 设置为接收主时钟设 备发送来的 PTP报文, 并获取所述 PTP报文中的报文平均间隔字段值, 其中所述 PTP 报文中的报文平均间隔字段值用于标识主时钟设备发送 PTP报文的实际间隔; 确定单 元, 设置为根据所述报文平均间隔字段值确定所述主时钟设备发送 PTP报文的实际间 隔; 检测单元, 设置为通过所述 PTP报文的实际间隔检测所述从时钟设备与所述主时 钟设备之间的时钟链路状态; 获取单元, 设置为根据所述时钟链路状态启用同步运算 获得同步信息; 调整单元, 设置为根据所述同步信息调整所述从时钟设备本地时钟, 使得所述从时钟设备时钟与所述主时钟设备之间的时钟同步。 优选的, 所述调整单元包括: 信息获取器, 设置为根据所述 PTP报文获得时间戳 信息; 同步运算器, 设置为通过所述时间戳信息以及同步运算获得同步信息。 一种 1588-2008协议中时钟获取 PTP报文的实际间隔的系统, 包括: 主时钟, 设 置为向从时钟设备发送 PTP报文, 所述 PTP报文中包括报文平均间隔字段值, 该报文 平均间隔字段值用于标示发送 PTP报文的实际间隔; 从时钟, 设置为接收 PTP报文, 根据所述 PTP报文中的报文平均间隔字段值确定主时钟设备发送 PTP报文的实际间 隔。 本发明的技术效果如下: 本发明中当采用单播通信方式时未启用信令报文协商机 制情况下, 从时钟设备接收主时钟设备发送来的 PTP报文, 并获取所述 PTP报文中的 报文平均间隔字段值, 其中所述报文平均间隔字段值用于标识所述主时钟设备发送所 述 PTP报文的实际间隔; 根据所述报文平均间隔字段值确定所述主时钟设备发送所述 PTP报文的实际间隔, 通过所述 PTP报文的实际间隔检测从时钟设备与所述主时钟设 备之间的时钟链路状态, 根据所述时钟链路状态获得同步信息, 并根据所述同步信息 调整所述从时钟设备的本地时钟, 以使所述本地时钟与所述主时钟设备的对端时钟之 间同步。 因此, 从时钟设备能够精确的获得主时钟设备发送的各个 PTP报文, 并能够精确 的获取到主时钟设备发送各个报文的平均报文间隔字段的值, 进而精确得获取到主时 钟设备发送 PTP报文的间隔, 并通过获得的 PTP报文完成本地时钟的调整, 最终实现 从时钟设备本地的时钟与主时钟设备的对端时钟的时钟同步。 附图说明 图 1 为本发明实施例一种 1588-2008协议中获取 PTP报文的实际间隔的方法流程 图; 图 2 为本发明实施例一种 1588-2008协议中报文间隔取值的设置示意图; 图 3为本发明实施例一种 1588-2008协议中获取 PTP报文的实际间隔的系统结构 示意图; 图 4 为本发明实施例一种 1588-2008协议中时钟同步的方法流程图; 图 5为本发明实施例一种 1588-2008协议中时钟同步的系统结构示意图; 图 6为本发明实施例一种 1588-2008协议中时钟同步的系统中调整单元的具体结 构示意图。 具体实施方式 本发明提供了一种 1588-2008协议中获取 PTP报文的实际间隔的方法, 用以在单 播通信方式时未启用信令报文协商机制的情况下, 从时钟设备能够获得主时钟设备发 送 PTP报文的实际间隔。 下面结合附图和具体实施例对本发明的技术方案做详细的说明。 如图 1所示, 本发明实施例提供一种 1588-2008协议中获取 PTP报文的实际间隔 的方法, 在单播通信方式时未启用信令报文协商机制的情况下, 从时钟设备能够获得 主时钟设备 PTP报文的发送间隔的具体流程如下。 步骤 101, 主时钟设备向从时钟设备发送 PTP报文, 所述 PTP报文中包括报文平 均间隔字段值, 该报文平均间隔字段值用于标识发送 PTP报文的实际间隔。 在 IEEE 1588v2 同步系统中, 主时钟设备会周期性发送 PTP (Precision Time Protocol精准时间协议) 报文来发布时间同步协议及时间信息。 在本申请的实施例中, 在单播通信未启用协商机制时, 所述主时钟设备向所述从 时钟设备发送的 PTP报文, 为了使得从时钟设备能够获得发送 PTP报文的实际间隔, 因此所述主时钟设备发送的 PTP报文中包含有报文平均间隔字段值, 其中所述平均报 文间隔字段值用于标识所述主时钟设备发送报文的实际间隔。 步骤 102, 从时钟设备接收 PTP报文, 根据所述 PTP报文中的报文平均间隔字段 值确定主时钟设备发送 PTP报文的实际间隔。 在从时钟设备接收到所述 PTP报文后,根据所述 PTP报文中的报文平均间隔字段 值来获取主时钟设备发送 PTP报文的实际间隔,从时钟设备通过 PTP报文的实际间隔 可以计算出主时钟设备第一次发送 PTP报文和第二次发送 PTP报文之间的实际间隔。 下面结合具体的运用环境对本申请提出的一种 1588-2008协议中时钟获取 PTP报 文的实际间隔的方法做详细的说明。 如图 2所示, 为报文间隔取值的设置示意图, 在本申请的实施例中, 对时钟同步 过程中需要用到的报文设置了报文间隔取值, 其具体设置如下:
Announce ( 通告报文 ) 的报文 间 隔取值为 : The value of the portDS.logAnnouncelnterval member of the data set (同端口数据集中的通告报文间隔字 段取值一致);
Sync (同步报文) 和 Follow up (跟随报文) 的报文间隔取值为: The value of the portDS.logSyncInterval member of the data set (取值同端口数据集中的同步报文间隔字 段取值一样); Delay Resp (延迟请求报文) 的报文间隔取值为: The value of the portDS.logMinDelayReqInterval member of the data set (取值同端口数据集中的最小平均 延迟请求报文间隔字段取值一样); 通过上述设置, 在 IEEE Std 1 588TM-2008标准协议中单播通信未启用协商机制的 情况下, 所述主时钟设备发送的 Announce (通告报文)、 Sync (同步报文)、 Follow up (跟随报文)、 Delay_Resp (延迟请求报文) 包含平均间隔字段值的 PTP报文。 从时钟设备通过获取主时钟设备发送的 PTP报文中 Announce (通告报文)、 Sync (同步报文)、 Follow up (跟随报文)、 Delay_Resp (延迟请求报文) 的平均间隔字段 值, 并通过所述平均间隔字段值确定主时钟设备发送各 PTP报文的实际间隔。 具体来说, 主时钟设备向从时钟设备发送 Sync, 其中 Sync中包含 Sync平均间隔 字段值,从时钟设备获得 Sync后会读取 Sync平均间隔字段值中 Sync的实际间隔(即, 主时钟设备发送第一个 Sync和发送第二个 Sync之间的实际时间间隔)。进而从时钟设 备就获得了 Sync的实际间隔。 如图 3所示, 对应本发明实施例提供的一种 1588-2008协议中获取 PTP报文的实 际间隔的方法, 本发明实施例还提供了一种 1588-2008协议中获取 PTP报文的实际间 隔的系统, 包括以下功能单元。 主时钟 301, 设置为向从时钟设备发送 PTP报文, 所述 PTP报文中包括报文平均 间隔字段值, 所述报文平均间隔字段值用于标示发送 PTP报文的实际间隔。 从时钟 302, 设置为接收 PTP报文, 根据所述 PTP报文中的报文平均间隔字段值 确定主时钟设备发送 PTP报文的实际间隔。 在采用单播通信方式时未启用信令报文协商机制的情况下, 主时钟设备向从时钟 设备发送 PTP报文, 所述 PTP报文中包括报文平均间隔字段值, 该报文平均间隔字段 值用于标示发送 PTP报文的实际间隔, 从时钟设备接收 PTP报文, 根据所述 PTP报 文中的报文平均间隔字段值确定主时钟设备发送 PTP报文的实际间隔。从而实现了从 时钟设备精确的获取到主时钟设备发送各个报文的平均报文间隔字段的值, 进而精确 得获取到主时钟设备发送 PTP报文的间隔。 本发明提供了一种 1588-2008协议中时钟同步的方法, 用以在单播通信方式时未 启用信令报文协商机制的情况下, 从时钟设备能够获得主时钟设备 PTP报文的发送间 隔。 如图 4所示, 本发明实施例提供一种 1588-2008协议中时钟同步的方法, 在单播 方式未启用协商机制通信的情况下, 从时钟设备接收主时钟设备发送的 PTP报文, 从 而实现从时钟设备与主时钟设备之间的时钟同步, 具体步骤如下。 步骤 401, 接收主时钟设备发送来的 PTP报文, 并获取所述 PTP报文中的报文平 均间隔字段值, 其中所述报文平均间隔字段值中用于标识所述主时钟设备发送所述 PTP报文的实际间隔。 步骤 402, 根据所述报文平均间隔字段值确定所述主时钟设备发送所述 PTP报文 的实际间隔。 步骤 403, 通过所述 PTP报文的实际间隔检测所述从时钟设备与所述主时钟设备 之间的时钟链路状态。 步骤 404, 根据所述时钟链路状态启用同步运算获得同步信息, 并根据所述同步 信息调整所述从时钟设备的本地时钟, 以使所述本地时钟与所述主时钟设备的对端时 钟之间同步。 在本实施例中, 从时钟设备根据该丢包率确定自身与主时钟设备之间的时钟链路 状态。 所以从时钟设备在检测自身与主时钟设备之间的链路状态之前, 需要获得自身 与主时钟设备的链路丢包率。 本发明实施例中,从时钟设备通过 PTP报文的实际间隔以及接收到的 PTP报文数 量获得丢包率。 具体实现方法为, 从时钟设备根据所述 PTP报文的实际间隔计算所述 主时钟设备在设定时间内发送的第一 PTP报文数(该第一 PTP报文数为从时钟设备根 据所述实际间隔预计主时钟设备在预设时间内发送的 PTP报文数), 并统计在该设定 时间内实际接收主时钟设备发送来的第二 PTP报文的数(该第二 PTP报文数为从时钟 设备统计确定在预设时间内实际接收到的主时钟设备发送的 PTP报文数), 进而通过 所述第一 PTP数和所述第二总数获得丢包率。 从时钟设备获得链路的丢包率之后, 判定丢包率是否超过预设的门限值, 如果不 是, 从时钟设备与主时钟设备之间的时钟链路为保持链接状态; 如果是, 从时钟设备 与主时钟设备之间时钟链路为断开链接状态。 通过上述方法使得从时钟设备能够精确的通过时钟链路的丢包率来确定时钟链路 的质量状况, 如果确定从时钟设备与主时钟设备之间的时钟链路为保持连接状态时, 则启用同步运算。 从时钟设备在检测到自身与主时钟设备之间的时钟链路为保持连接状态后, 则从 接收到的 PTP报文中获取时间戳信息,并利用所述时间戳进行同步运算获得同步信息; 然后应用所述同步信息对本地时间进行调整, 使本地时钟与所述主时钟设备的时钟之 间同步。 在本实施例中, 所述同步信息为从时钟设备与主时钟设备之间的时间延迟以及时 间误差。 参见图 5,对应本发明实施例提供的一种 1588-2008协议中时钟同步的方法,本发 明实施例还提供了一种 1588-2008协议中时钟同步的系统, 包括以下功能单元。 接收单元 501, 设置为接收主时钟设备发送来的 PTP报文, 并获取所述 PTP报文 中的报文平均间隔字段值, 其中所述报文平均间隔字段值用于标识所述主时钟设备发 送所述 PTP报文的实际间隔。 确定单元 502, 设置为根据所述报文平均间隔字段值确定所述主时钟设备发送所 述 PTP报文的实际间隔。 检测单元 503, 设置为通过所述 PTP报文的实际间隔检测所述从时钟设备与所述 主时钟设备之间的时钟链路状态。 获取单元 504, 设置为根据所述时钟链路状态启用同步运算获得同步信息。 调整单元 505, 设置为根据所述同步信息调整所述从时钟设备本地时钟, 使得所 述从时钟设备时钟与所述主时钟设备之间的时钟同步。 如图 6所述为本实施例的系统中调整单元 505的具体结构示意图, 其中调整单元 505还包括。 信息获取器 601, 设置为根据所述 PTP报文获得时间戳信息。 同步运算器 602, 设置为通过所述时间戳信息以及同步运算获得同步信息。 本发明的技术方案所要达到的技术效果如下: 本发明中当采用单播通信方式时未 启用信令报文协商机制情况下, 从时钟设备接收主时钟设备发送来的 PTP报文, 并获 取 PTP报文中的报文平均间隔字段值, 其中报文平均间隔字段值用于标识主时钟设备 发送 PTP报文的实际间隔;根据报文平均间隔字段值确定主时钟设备发送 PTP报文的 实际间隔, 通过 PTP报文的实际间隔检测从时钟设备与主时钟设备之间的时钟链路状 态, 根据时钟链路状态获得同步信息, 并根据同步信息调整从时钟设备的本地时钟, 以使本地时钟与主时钟设备的对端时钟之间同步。 因此, 从时钟设备能够精确的获得主时钟设备发送的各个 PTP报文, 并能够精确 的获取到主时钟设备发送各个报文的平均报文间隔字段的值, 进而精确得获取到主时 钟设备发送 PTP报文的间隔, 并通过获得的 PTP报文完成本地时钟的调整, 最终实现 从时钟设备的本地时钟与主时钟设备的对端时钟之间时钟同步。 显然, 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明的精 神和范围。 这样, 倘若本发明的这些修改和变型属于本发明权利要求及其等同技术的 范围之内, 则本发明也意图包含这些改动和变型在内。

Claims

权 利 要 求 书 、 一种 1588-2008协议中时钟同步的方法, 应用于在单播方式未启用协商机制进 行通信的情况下, 包括:
接收主时钟设备发送来的 PTP报文,并获取所述 PTP报文中的报文平均间 隔字段值, 其中, 所述报文平均间隔字段值用于标识所述主时钟设备发送所述 PTP报文的实际间隔;
根据所述报文平均间隔字段值确定所述主时钟设备发送所述 PTP报文的实 际间隔;
通过所述 PTP报文的实际间隔检测所述从时钟设备与所述主时钟设备之间 的时钟链路状态;
根据所述时钟链路状态启用同步运算获得同步信息, 并根据所述同步信息 调整所述从时钟设备的本地时钟, 以使所述本地时钟与所述主时钟设备的对端 时钟之间同步。 、 如权利要求 1所述的方法, 其中, 所述通过所述 PTP报文的实际间隔检测从时 钟设备与所述主时钟设备之间的时钟链路状态, 具体为:
通过所述 PTP报文的实际间隔以及接收到的 PTP报文数量获得丢包率; 根据所述丢包率确定所述从时钟设备与所述主时钟设备之间的时钟链路状 态。 、 如权利要求 2所述的方法, 其中, 所述通过所述 PTP报文的实际间隔以及接收 到的 PTP报文数量获得丢包率, 具体为:
根据所述 PTP报文的实际间隔计算所述主时钟设备在设定时间内发送的第 一 PTP报文数;
统计在所述设定时间内实际接收所述主时钟设备发送来的第二 PTP 报文 数;
通过所述第一 PTP报文数和所述第二 PTE报文数获得所述丢包率。 、 如权利要求 2所述的方法, 其中, 所述根据所述丢包率确定所述从时钟设备与 所述主时钟设备之间的时钟链路状态, 具体为: 判断所述丢包率是否超过预设门限值, 如果否, 则确定所述从时钟设备与 所述主时钟设备之间的时钟链路为保持连接状态; 如果是, 则确定所述从时钟 设备与所述主时钟设备之间时钟链路为断开连接状态。 、 如权利要求 4所述的方法, 其中, 所述根据所述时钟链路状态启用同步运算获 得同步信息, 并根据所述同步信息调整所述从设备的本地时钟, 具体为: 如果确定所述从时钟设备与所述主时钟设备之间的时钟链路为保持连接状 态, 则启用同步运算;
获取 PTP报文中的时间戳信息, 并利用获取到的时间戳信息进行同步运算 获得同步信息, 并利用所述同步信息对所述从时钟设备的本地时间进行调整。 、 如权利要求 5所述的方法, 其中, 所述同步信息为主、 从时钟设备之间的时间 延迟以及时间误差。 、 一种 1588-2008协议中获取 PTP报文的实际间隔的方法, 具体包括:
主时钟设备向从时钟设备发送 PTP报文,所述 PTP报文中包括报文平均间 隔字段值,所述报文平均间隔字段值用于标识所述主时钟设备发送 PTP报文的 实际间隔;
从时钟设备接收 PTP报文,根据所述 PTP报文中的报文平均间隔字段值确 定主时钟设备发送 PTP报文的实际间隔。 、 一种 1588-2008协议中时钟同步的系统, 包括:
接收单元, 设置为接收主时钟设备发送来的 PTP 报文, 并获取所述 PTP 报文中的报文平均间隔字段值, 其中所述报文平均间隔字段值用于标识所述主 时钟设备发送所述 PTP报文的实际间隔;
确定单元, 设置为根据所述报文平均间隔字段值确定所述主时钟设备发送 PTP报文的实际间隔;
检测单元, 设置为通过所述 PTP报文的实际间隔检测所述从时钟设备与所 述主时钟设备之间的时钟链路状态;
获取单元, 设置为根据所述时钟链路状态启用同步运算获得同步信息; 调整单元, 设置为根据所述同步信息调整所述从时钟设备本地时钟, 使得 所述从时钟设备时钟与所述主时钟设备之间的时钟同步。 、 如权利要求 8所述的系统, 其中, 所述调整单元包括: 信息获取器, 设置为根据所述 PTP报文获得时间戳信息;
同步运算器, 设置为通过所述时间戳信息以及同步运算获得同步信息。 一种 1588-2008协议中时钟获取 PTP报文的实际间隔的系统, 包括:
主时钟,设置为向从时钟设备发送 PTP报文,所述 PTP报文中包括报文平 均间隔字段值, 所述报文平均间隔字段值用于标示发送 PTP报文的实际间隔; 从时钟,设置为接收 PTP报文,根据所述 PTP报文中的报文平均间隔字段 值确定主时钟发送 PTP报文的实际间隔。
PCT/CN2012/078254 2011-10-17 2012-07-05 一种1588-2008协议中时钟同步的方法及系统 WO2013056575A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP12842457.9A EP2770678A4 (en) 2011-10-17 2012-07-05 METHOD AND SYSTEM FOR SYNCHRONIZATION OF CLOCKS IN PROTOCOL 1588-2008

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201110314766.3A CN103051406B (zh) 2011-10-17 2011-10-17 一种1588‑2008协议中时钟同步的方法及系统
CN201110314766.3 2011-10-17

Publications (1)

Publication Number Publication Date
WO2013056575A1 true WO2013056575A1 (zh) 2013-04-25

Family

ID=48063918

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2012/078254 WO2013056575A1 (zh) 2011-10-17 2012-07-05 一种1588-2008协议中时钟同步的方法及系统

Country Status (3)

Country Link
EP (1) EP2770678A4 (zh)
CN (1) CN103051406B (zh)
WO (1) WO2013056575A1 (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112350794A (zh) * 2019-08-09 2021-02-09 诺基亚通信公司 一种端到端透明时钟和转发ptp报文的方法
CN115664627B (zh) * 2022-12-14 2023-03-10 四川创智联恒科技有限公司 基于1588协议的频率同步精度检测方法及自适应系统

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105681016B (zh) * 2014-11-17 2019-02-05 中国移动通信集团公司 一种时间同步方法及装置
CN106209337B (zh) * 2015-04-29 2019-10-15 中国移动通信集团公司 一种时间同步报文发送频率自适应方法、装置及设备
US9602271B2 (en) 2015-06-01 2017-03-21 Globalfoundries Inc. Sub-nanosecond distributed clock synchronization using alignment marker in ethernet IEEE 1588 protocol
CN106301996B (zh) * 2015-06-26 2019-10-08 中国移动通信集团公司 一种ptp报文自动测试的方法及装置
CN106549822B (zh) * 2015-09-16 2019-12-06 中国移动通信集团公司 测试时间同步报文的响应时间的方法、装置及测试设备
CN106411446B (zh) * 2016-08-29 2018-08-31 烽火通信科技股份有限公司 一种在单播模式下实现1588时间同步的自适应方法
US11483127B2 (en) 2018-11-18 2022-10-25 Mellanox Technologies, Ltd. Clock synchronization
US11283454B2 (en) 2018-11-26 2022-03-22 Mellanox Technologies, Ltd. Synthesized clock synchronization between network devices
US11543852B2 (en) 2019-11-07 2023-01-03 Mellanox Technologies, Ltd. Multihost clock synchronization
CN113078976A (zh) * 2020-01-06 2021-07-06 华为技术有限公司 一种时钟端口属性恢复方法、设备及系统
CN113162813B (zh) * 2020-01-22 2022-06-03 烽火通信科技股份有限公司 一种ptp报文丢失检测分析方法和装置
CN111355551A (zh) * 2020-02-11 2020-06-30 西安电子科技大学 一种适用于半稳态链路的网络时钟同步方法及装置
US11552871B2 (en) 2020-06-14 2023-01-10 Mellanox Technologies, Ltd. Receive-side timestamp accuracy
US11606427B2 (en) 2020-12-14 2023-03-14 Mellanox Technologies, Ltd. Software-controlled clock synchronization of network devices
US11588609B2 (en) 2021-01-14 2023-02-21 Mellanox Technologies, Ltd. Hardware clock with built-in accuracy check
US11907754B2 (en) 2021-12-14 2024-02-20 Mellanox Technologies, Ltd. System to trigger time-dependent action
WO2023115258A1 (zh) * 2021-12-20 2023-06-29 华为技术有限公司 一种报文传输方法及对应装置
US11835999B2 (en) 2022-01-18 2023-12-05 Mellanox Technologies, Ltd. Controller which adjusts clock frequency based on received symbol rate
US11706014B1 (en) 2022-01-20 2023-07-18 Mellanox Technologies, Ltd. Clock synchronization loop
US11917045B2 (en) 2022-07-24 2024-02-27 Mellanox Technologies, Ltd. Scalable synchronization of network devices

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080069150A1 (en) * 2006-09-19 2008-03-20 Sig Harold Badt Precision Time Protocol Emulation for Network Supportive of Circuit Emulation Services
CN101232457A (zh) * 2008-02-22 2008-07-30 浙江大学 一种基于ieee1588协议的高精度实时同步方法
CN101394264A (zh) * 2007-09-21 2009-03-25 华为技术有限公司 周期性报文传递的监控方法及装置
CN101404618A (zh) * 2008-11-04 2009-04-08 中兴通讯股份有限公司 实现精确时钟同步协议中透传时钟的系统、装置及方法

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5560706B2 (ja) * 2009-12-28 2014-07-30 富士通株式会社 ノード装置
US8630315B2 (en) * 2010-02-17 2014-01-14 Ciena Corporation Ethernet network synchronization systems and methods

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080069150A1 (en) * 2006-09-19 2008-03-20 Sig Harold Badt Precision Time Protocol Emulation for Network Supportive of Circuit Emulation Services
CN101394264A (zh) * 2007-09-21 2009-03-25 华为技术有限公司 周期性报文传递的监控方法及装置
CN101232457A (zh) * 2008-02-22 2008-07-30 浙江大学 一种基于ieee1588协议的高精度实时同步方法
CN101404618A (zh) * 2008-11-04 2009-04-08 中兴通讯股份有限公司 实现精确时钟同步协议中透传时钟的系统、装置及方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112350794A (zh) * 2019-08-09 2021-02-09 诺基亚通信公司 一种端到端透明时钟和转发ptp报文的方法
CN112350794B (zh) * 2019-08-09 2024-01-16 诺基亚通信公司 一种端到端透明时钟和转发ptp报文的方法
CN115664627B (zh) * 2022-12-14 2023-03-10 四川创智联恒科技有限公司 基于1588协议的频率同步精度检测方法及自适应系统

Also Published As

Publication number Publication date
EP2770678A4 (en) 2015-05-06
CN103051406B (zh) 2017-02-08
CN103051406A (zh) 2013-04-17
EP2770678A1 (en) 2014-08-27

Similar Documents

Publication Publication Date Title
WO2013056575A1 (zh) 一种1588-2008协议中时钟同步的方法及系统
JP7173001B2 (ja) 無線機器および無線機器の処理方法
US9256247B2 (en) Method and apparatus for communicating time information between time aware devices
CN102907021B (zh) 优化定时分组传输
WO2017101528A1 (zh) 一种时钟链路切换方法、装置及基站
WO2012151808A1 (zh) 基于精确时钟协议提高同步精度的方法及系统
WO2016004644A1 (zh) 一种监控以太网时钟同步的方法及装置
TW201625040A (zh) 同步網路裝置的時脈之方法
WO2016095099A1 (zh) 一种时间同步方法及装置
WO2018006686A1 (zh) 一种通信网络设备间时间同步的优化方法、装置及设备
CN101827098A (zh) 时间同步的处理方法及装置
WO2011085585A1 (zh) 时间同步的方法和设备
MY168816A (en) Systems and methods of network synchronization
WO2011076066A1 (zh) 时钟同步方法、设备和系统
JP2018505576A (ja) 複数のシンクデバイスへのワイヤレスストリーミング伝送のタイミングを同期する技法
WO2012065334A1 (zh) 在时分复用网络中实现时间同步的方法、设备和系统
CN103929293A (zh) 非对称延迟的时间同步方法及系统
US20220007321A1 (en) Network Entities and Methods for a Wireless Network System for Determining Time Information
WO2011134371A1 (zh) 一种同步时钟的方法和时钟同步装置
JP5518805B2 (ja) 時刻同期方法および時刻同期装置
WO2017032113A1 (zh) 一种时间同步偏差检测方法和装置
JP2013017104A (ja) 通信システム
WO2012163172A1 (zh) 一种时钟同步方法及设备
WO2011143973A1 (zh) 一种设备之间进行时钟同步的方法和装置
WO2013159486A1 (zh) Ptp时钟源切换的方法、主从时钟设备及系统

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: 12842457

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2012842457

Country of ref document: EP