WO2018041044A1 - Self-adaptive method for realizing 1588 time synchronization in unicast mode - Google Patents

Self-adaptive method for realizing 1588 time synchronization in unicast mode Download PDF

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Publication number
WO2018041044A1
WO2018041044A1 PCT/CN2017/099110 CN2017099110W WO2018041044A1 WO 2018041044 A1 WO2018041044 A1 WO 2018041044A1 CN 2017099110 W CN2017099110 W CN 2017099110W WO 2018041044 A1 WO2018041044 A1 WO 2018041044A1
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message
request
unicast
network element
response message
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PCT/CN2017/099110
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French (fr)
Chinese (zh)
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曾亮
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烽火通信科技股份有限公司
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Priority to PH12019500011A priority Critical patent/PH12019500011A1/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J3/00—Time-division multiplex systems
    • H04J3/02—Details
    • H04J3/06—Synchronising arrangements
    • 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
    • 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
    • H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
    • 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
    • H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation

Definitions

  • the present invention relates to 1588 time synchronization, and in particular to an adaptive method for implementing 1588 time synchronization in a unicast mode.
  • the 1588 time synchronization technology is used to implement time synchronization between network elements and is widely used in mobile backhaul scenarios to ensure normal communication between 4G base stations.
  • the technical details are standardized in the IEEE1588-2008 standard, including the establishment of network elements.
  • the master-slave relationship (determining the master-slave relationship between network elements by comparing the clock quality parameters carried in the advertisement message) and calculating the time offset and adjusting the time are two steps.
  • the discussion of the 1588 time synchronization technology in the IEEE1588-2008 standard is mainly based on the multicast model.
  • the time synchronization through the unicast model is only an optional option, and there is no mandatory requirement, but in our actual application scenario, Especially for the three-layer network of telecom and China Unicom operators, the need for time synchronization through the unicast model is more intense.
  • the 1588 time synchronization through the unicast model mainly includes the following two modes:
  • the network element (network element 1 and network element 2) periodically forwards to the peer network element (network element 2 or network element 1). Send a unicast request message for the advertisement message;
  • the network element receives the unicast request message of the advertisement message and responds to the unicast response message of the advertisement message.
  • the unicast response message cannot be promised.
  • the unicast request message of the acknowledgment message is included; otherwise, the unicast response message of the advertised message includes the unicast request message of the advertised message, and the unicast request message is sent to the peer end periodically according to the current port status (main clock). ;
  • the NE receives the unicast response packet of the advertisement packet. If the packet information is a unicast request for the advertisement, the network element is ready to receive the advertisement packet. Otherwise, the negotiation parameters are modified and the advertisement is re-initiated. Message unicast request;
  • the NE receives the advertisement packet and runs the optimal master clock algorithm to determine the state of the port. That is, both NEs receive the advertisement packet and run the optimal master clock algorithm to determine the state of the port.
  • the master and slave relationships are established.
  • the main clock network element calculates the clock deviation and adjusts the processing flow:
  • the primary clock network element periodically sends an advertisement packet.
  • the master clock network element receives the unicast request packet of the synchronization packet of the peer network element. If the request cannot be promised, the replies to the unicast response packet of the synchronization packet that rejects the request of the peer end; otherwise, the reply receives the request of the peer end. Synchronize the packet unicast response packet, and start to send the synchronization packet periodically.
  • the master clock network element receives the unicast request message of the delay response message. If the request cannot be promised, the unicast request response message of the delayed response message rejecting the request of the opposite end is replied; otherwise, the response is received by the peer end. Delay response message unicast request response message;
  • the master clock network element receives the delay request message, and if the current state is the response response peer delay request message, the response delay response request message; otherwise, the received delay request message is discarded, and no response is received. .
  • the synchronous network packet unicast request packet is periodically sent from the clock network element.
  • the delay response packet is received from the clock network element and processed normally.
  • negotiation unicast is optional on the standard, there is no mandatory requirement, and it is slightly more complicated to implement. Therefore, based on the multicast model, each manufacturer proposes a new unicast implementation method, which is compared to the negotiation unicast. The negotiation process is omitted and implemented in a multicast-like manner. As shown in FIG. 3 and FIG. 4, both the network element 1 and the network element 2 adopt a mandatory unicast mode, specifically:
  • the network element (the network element 1 and the network element 2) whose port is the master clock sends the advertisement packet to the peer end (the network element 2 and the network element 1).
  • the network element receives the advertisement packet and runs the optimal master clock algorithm to determine the port status.
  • the primary clock network element periodically sends an advertisement packet.
  • the master clock network element periodically sends synchronization packets.
  • the master clock network element receives the peer delay request packet and responds with the delay response packet.
  • the delay response packet is received from the clock network element and processed normally.
  • the network elements can communicate with each other only when the configured unicast mode (negotiating unicast mode or forced unicast mode) is the same.
  • the unicast mode is negotiated, and the other is forced unicast mode.
  • network element 1 is configured to negotiate unicast mode
  • network element 2 is configured to force unicast mode. Therefore, only the network element 2 has the opportunity to send an advertisement message to the network element 1 for the network element 1.
  • the network element 1 Since the network element 2 does not send the unicast request message, the network element 1 does not actively send the advertisement message to the network element 2 If the clock quality of the network element 1 is higher than that of the network element 2, the network element 2 cannot learn the clock quality information of the network element 1, and the master/slave relationship fails to be established. The network element 2 cannot synchronize with the network element 1 for 1588 time synchronization. .
  • the technical problem to be solved by the present invention is to provide an adaptive scheme capable of performing normal interworking with both the negotiated unicast mode and the forced unicast mode, thereby realizing the problem of 1588 time synchronization.
  • the technical solution adopted by the present invention is to provide an adaptive method for implementing 1588 time synchronization in a unicast mode, including:
  • the event processing mode of each clock network element is based on the negotiation of the unicast mode master-slave relationship, and the port state is increased as the master clock port to actively send the advertisement packet;
  • the event processing mode of the master clock network element is based on the negotiation of the unicast mode master clock event processing mode, and the method of receiving the unicast request message of the peer delay response message is received. Sending a delay request response message directly to the delay request message;
  • the active unicast delay request message is added on the basis of the negotiation of the unicast mode from the clock event processing mode.
  • the event processing manner of each clock network element is specifically:
  • the unicast request packet and the advertisement packet of the advertisement packet are periodically sent.
  • the unicast request response message is rejected in response to the refusal of the peer request. Otherwise, the unicast request is received in response to the peer request. Response message
  • the best master clock algorithm is run to determine the port status.
  • the event processing mode of the master clock NE is specifically as follows:
  • the unicast request response message is rejected in response to the request, and the unicast request response message is received in response to the synchronization message;
  • the unicast request packet of the delay response message is received, if the request cannot be promised, the unicast request response message is rejected in response to the request for rejecting the peer request; otherwise, the response is delayed by the peer request.
  • Response message unicast request response message If the unicast request packet of the delay response message is received, if the request cannot be promised, the unicast request response message is rejected in response to the request for rejecting the peer request; otherwise, the response is delayed by the peer request.
  • the device When receiving the delay request message, the device directly responds to the delay request response message regardless of whether the unicast request message of the delay response message is received.
  • the event processing method of the slave clock network element is specifically as follows:
  • the peer Upon receiving the unicast request response packet, if the peer has received the unicast request for the synchronization packet, it is ready to receive the synchronization packet and process it normally; otherwise, modify the negotiation parameters and re-initiate the synchronization packet unicast request. ;
  • the delay request message is actively sent regardless of whether the unicast request response message of the delay response message is received.
  • the present invention improves the negotiated unicast mode, and obtains an adaptive method (adaptive unicast mode) that can communicate with the negotiated unicast mode and the forced unicast mode to implement 1588 time synchronization between network elements;
  • an adaptive method adaptive unicast mode
  • the unicast interworking mode is not required to be agreed with the peer end. This ensures that any unicast mode NEs can communicate with each other. This is especially applicable to interworking between devices of different vendors.
  • FIG. 1 is a flowchart of establishing a master-slave relationship between network elements in a negotiated unicast mode
  • 2 is a flow chart of calculating deviations and adjusting between network elements in a negotiated unicast mode
  • 3 is a flowchart of establishing a master-slave relationship between network elements in a forced unicast mode
  • 4 is a flow chart of calculating deviations and adjusting between network elements in a negotiated unicast mode
  • Figure 5 shows the establishment of master and slave between NEs configured in negotiation mode and forced mode.
  • FIG. 6 is a flowchart of establishing a master-slave relationship between network elements configured by the unicast method and the configuration negotiation mode provided by the present invention
  • FIG. 7 is a flowchart of calculating a deviation and adjusting between a master clock network element of a unicast method provided by the present invention and a slave clock network element in a configuration negotiation mode;
  • FIG. 8 is a flowchart of calculating a deviation and adjusting between a slave clock network element and a master clock network element in a configuration negotiation mode according to the unicast method provided by the present invention
  • FIG. 9 is a flowchart of establishing a master-slave relationship between network elements configured by the unicast method and the mandatory mode provided by the present invention.
  • FIG. 10 is a flowchart of calculating a deviation and adjusting between a master clock network element of a unicast method provided by the present invention and a slave clock network element configured in a mandatory mode;
  • FIG. 11 is a flowchart of calculating a deviation and adjusting between a slave clock network element and a master clock network element configured in a mandatory mode according to the unicast method provided by the present invention
  • FIG. 12 is a flowchart of establishing a master-slave relationship between network elements configuring a unicast method provided by the present invention
  • FIG. 13 is a flowchart of calculating and adjusting a deviation between a master clock network element and a slave clock network element in a unicast method provided by the present invention.
  • the present invention provides an adaptive method for implementing 1588 time synchronization in a unicast mode, and optimizes the negotiated unicast mode from two phases of 1588 time synchronization respectively:
  • the event processing mode of each clock network element is based on the negotiation of the unicast mode master and slave relationship establishment, and the port state is increased as the master clock port.
  • the event processing mode of the master clock network element is based on the negotiation of the unicast mode master clock event processing mode, and the method of receiving the unicast request message of the peer delay response message is received. Sending a delay request response message directly to the delay request message;
  • the active unicast delay request message is added on the basis of the negotiation of the unicast mode from the clock event processing mode.
  • the event handling method of each clock network element is specifically:
  • the unicast request response message is rejected in response to the refusal of the peer request. Otherwise, the unicast request is received in response to the peer request. Response message
  • the device automatically sends the advertisement packet without waiting for the peer to send the advertisement packet unicast request packet.
  • the best master clock algorithm is run to determine the port status.
  • the initial network element port states are both master clock states, and then the master and slave relationships are established by sending and receiving advertisement messages.
  • the master and slave relationships are established by sending and receiving advertisement messages.
  • the network element port periodically sends an advertisement packet, and the slave network element port only receives the advertisement packet. If the network element (the slave clock network element) does not receive the advertisement packet sent by the peer end within a certain period of time, the network element port The state will go directly to the main clock state, so that the main clock state must exist.
  • the event processing mode of the master clock NE is specifically as follows:
  • the device After the master clock is configured, the device sends the advertisement packet and the synchronization packet periodically. The device does not need to wait for the peer to send the synchronization packet unicast request packet.
  • the unicast request response message is rejected in response to the request, and the unicast request response message is received in response to the synchronization message;
  • the unicast request packet of the delay response message is received, if the request cannot be promised, the unicast request response message is rejected in response to the request for rejecting the peer request; otherwise, the response is delayed by the peer request.
  • Response message unicast request response message If the unicast request packet of the delay response message is received, if the request cannot be promised, the unicast request response message is rejected in response to the request for rejecting the peer request; otherwise, the response is delayed by the peer request.
  • the device When receiving a delay request message, the device directly responds to the delay request response message regardless of whether the unicast request message of the delay response message is received, that is, it does not need to wait for the peer end to send the delay response message unicast request message. Text.
  • the event processing method of the slave clock network element is specifically as follows:
  • the peer Upon receiving the unicast request response packet, if the peer has received the unicast request for the synchronization packet, it is ready to receive the synchronization packet and process it normally; otherwise, modify the negotiation parameters and re-initiate the synchronization packet unicast request. ;
  • the unicast request response message is automatically sent, regardless of whether the unicast request response message is received, that is, the unicast request response message is not required to wait for the delay response message of the peer end.
  • the present invention increases the unicast negotiation mechanism in the establishment of the master-slave relationship phase; in the calculation deviation and adjustment phase, the master clock network element increases the response unicast request mechanism; Broadcast request mechanism.
  • the processing method of the present invention and the negotiating unicast mode are as follows:
  • the network element 1 is configured to be the adaptive unicast mode provided by the present invention, and the network element 2 is configured to negotiate the unicast mode.
  • the specific process is as follows:
  • the network element 1 periodically sends an advertised message unicast request message and an advertisement message;
  • the network element 2 receives the unicast request message of the advertisement message, responds to the unicast request response message of the advertisement message, and starts to send the advertisement message;
  • the network element 1 receives the unicast request response message of the advertisement message. If the response message is received by the peer end and the advertisement message is sent, the network element 1 is ready to receive the advertisement message. Otherwise, the negotiation parameter is modified and the advertisement message is re-initiated.
  • Unicast request ;
  • NE 1 receives the advertisement packet and runs the optimal master clock algorithm to determine the port status.
  • the network element 2 periodically sends an advertised message unicast request message.
  • the network element 1 receives the unicast request message of the advertisement message, and responds to the unicast request response message of the advertisement message;
  • the network element 2 receives the unicast request response message of the advertisement message. If the response message is the peer end accepting the request and starts to send the advertisement message (the network element 1 is always sending the advertisement message periodically), the network element 2 is ready to receive the notification message. Otherwise; modify the negotiation parameters and re-initiate the unicast request for the advertisement message;
  • NE 2 receives the advertisement packet and runs the optimal master clock algorithm to determine the port status.
  • both parties can receive the notification message from the peer end, and the master and slave relationship are successfully established.
  • the primary clock network element 1 is configured with an adaptive unicast mode
  • the slave clock network element 2 is configured to negotiate a unicast mode.
  • the network element 1 periodically sends an advertisement packet and a synchronization packet.
  • the network element 2 periodically sends a synchronous message unicast request message.
  • the network element 1 receives the synchronization message unicast request message, and responds to the synchronization message unicast request response message;
  • the network element 2 receives the step message unicast request response message, and if the response message is an accept request, it is ready to accept the synchronization message and normally processes the received synchronization message; otherwise, the negotiation parameter is modified, and the request is re-initiated. ;
  • the network element 2 periodically sends a delay response message unicast request message
  • the network element 1 receives the unicast request message of the delayed response message, and responds to the delayed response message unicast request response message;
  • the network element 2 receives the delay response message unicast request response message, and if the response message is an accept request, starts to send the delay request message; otherwise, the negotiation parameter is modified, and the request is re-initiated;
  • the network element 1 receives the delay request message and directly responds to the delay request message.
  • the slave clock network element 2 can normally receive the synchronization message and the delay response message, thereby implementing the calculation offset adjustment.
  • the primary clock network element 1 is configured to negotiate a unicast mode
  • the secondary network mode is configured from the clock network element 2 and the specific process is as follows:
  • the network element 1 periodically sends an advertisement message.
  • the network element 2 periodically sends a synchronous message unicast request message.
  • the network element 1 receives the synchronization message unicast request message, responds to the synchronization message unicast request response message, and starts to periodically send the synchronization message;
  • the network element 2 receives the synchronization message unicast request response message, and if the response message is an acceptance request, it prepares to accept the synchronization message and processes the received synchronization message normally; otherwise, the negotiation parameter is modified, and the request is re-initiated. ;
  • the network element 2 periodically sends a delay response message unicast request message and a delay request message;
  • the network element 1 receives the unicast request message of the delayed response message, and if it receives the request, responds to the unicast request response message of the delayed response message; otherwise, the unicast request message of the delayed response message is discarded;
  • the network element 2 receives the unicast request response message of the delay response message, the response message is an accept request, and no processing is performed; otherwise, the negotiation parameter is modified, and the request is re-initiated;
  • the network element 1 receives the delay request message and directly responds to the delay request message.
  • the slave clock network element 2 can normally receive the synchronization message and the delay response message, thereby implementing the calculation offset adjustment.
  • the processing method of the invention (adaptive unicast mode) and the forced unicast mode is as follows:
  • the network element 1 is configured as the adaptive unicast mode provided by the present invention, and the network element 2 is configured as the mandatory unicast mode.
  • the specific process is as follows:
  • the network element 1 periodically sends an advertised message unicast request message.
  • the network element 2 receives the unicast request message for the advertisement message and does not perform any processing.
  • the network element 1 periodically sends an advertisement message.
  • the network element 2 receives the advertisement packet and runs the optimal master clock algorithm to determine the port status.
  • the network element 2 periodically sends an advertisement message.
  • NE 1 receives the advertisement packet and runs the optimal master clock algorithm to determine the port status.
  • both the network element 1 and the network element 2 can receive the advertisement message of the peer end, and the master and slave relationships can be successfully established.
  • the primary clock network element 1 is configured with an adaptive unicast mode
  • the slave clock network element 2 is configured with a mandatory unicast mode.
  • the network element 1 periodically sends an advertisement packet and a synchronization packet.
  • the network element 2 receives the synchronization packet and processes it normally.
  • the network element 2 periodically sends a delay request message.
  • the network element 1 receives the delay request message and directly responds to the delay request response message
  • the network element 2 receives the delay request response message and processes it normally.
  • the slave clock network element 2 can normally receive the synchronization message and the delay response message, and complete the calculation offset adjustment.
  • the second case is as follows: As shown in FIG. 11, the primary clock network element 1 is configured with a forced unicast mode, and the secondary network mode of the slave clock network element 2 is configured.
  • the network element 1 periodically sends an advertisement message.
  • the network element 2 periodically sends a synchronous message unicast request message.
  • the network element 1 receives the unicast request packet of the synchronization packet and does not respond.
  • the network element 1 periodically sends synchronization packets.
  • the network element 2 receives the synchronization packet and processes it normally.
  • the network element 2 periodically sends a delay response message to the unicast request message.
  • the network element 1 receives the unicast request message of the delayed response message and does not respond.
  • the network element 2 periodically sends a delay request message
  • the network element 1 receives the delay request message and responds to the delay request response message.
  • the slave clock network element 2 can normally receive the synchronization message and the delay response message, thereby completing the calculation deviation adjustment.
  • the role of the notification message is no longer the first stage.
  • the master and slave relationships of the two parties are established, but the master and slave relationships are maintained.
  • the clock source only keeps receiving the notification message from the peer end until the master clock is always present; otherwise, the port will be automatically
  • the state changes to the master clock state and begins to re-establish a new master-slave relationship.
  • the interworking between the network elements in the adaptive unicast mode provided by the present invention is as follows:
  • the network element 1 In the establishment of the master-slave relationship phase, as shown in FIG. 12, the network element 1 is configured as an adaptive single. In the broadcast mode, NE 2 is configured as an adaptive unicast mode.
  • the specific process is as follows:
  • the network element 1 and the network element 2 periodically send the unicast request message and the pass message of the advertisement message respectively.
  • the network element 2 and the network element 1 respectively receive the unicast request message of the advertisement message, and respond to the unicast request response message of the advertisement message;
  • the network element 1 and the network element 2 respectively receive the unicast request response message of the advertisement message, and if the response message is the peer end accepting the request and starts to send the advertisement message, it is ready to receive the advertisement message; otherwise, the negotiation parameter is modified. Re-initiating a unicast request for an advertisement message;
  • the network element 1 and the network element 2 respectively receive the advertisement packet, and run the optimal master clock algorithm to determine the state of the port.
  • both the network element 1 and the network element 2 can receive the advertisement message of the peer end, and the master-slave relationship and the relationship are successfully established.
  • both the primary clock network element 1 and the secondary clock network element 2 are configured in an adaptive unicast mode, and the specific process is as follows:
  • the network element 1 periodically sends an advertisement message.
  • the network element 2 periodically sends a synchronous message unicast request message.
  • the network element 1 receives the synchronization message unicast request message, and responds to the synchronization message unicast request response message and the synchronization message;
  • the network element 2 receives the synchronous message unicast request response message. If the peer end accepts the synchronization message unicast request, it prepares to receive the synchronization message and processes the synchronization message normally; otherwise, the negotiation parameter is modified, and the synchronization message is re-initiated.
  • Unicast request If the peer end accepts the synchronization message unicast request, it prepares to receive the synchronization message and processes the synchronization message normally; otherwise, the negotiation parameter is modified, and the synchronization message is re-initiated.
  • the network element 2 periodically sends a delay response message unicast request message and a delay request message;
  • the network element 1 receives the unicast request message of the delayed response message, and responds to the delay response message unicast request response message;
  • the network element 2 receives the unicast request response message of the delayed response message, and if the peer end has accepted the extension Respond to the message unicast request, do not do any processing; otherwise, modify the negotiation parameters and re-initiate the request;
  • the network element 1 receives the delay request message and directly responds to the delay request for the corresponding message.
  • the slave clock can normally receive the synchronization message and the delay response message, and complete the calculation offset adjustment.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

Disclosed is a self-adaptive method for realizing 1588 time synchronization in a unicast mode. The method comprises: during the stage of establishing a master-slave relationship, in an event processing method of each clock network element, increasing an actively sent notification message based on the established master-slave relationship in a negotiated unicast mode; during the stage of calculating a deviation and performing adjustment, in an event processing method of a master clock network element, increasing an actively sent synchronous message and an actively sent delay request response message based on a master clock event processing method in the negotiated unicast mode; and in an event processing method of a slave clock network element, increasing an actively sent delay request message based on a slave clock event processing method in the negotiated unicast mode. According to the present invention, the negotiated unicast mode is improved; therefore, when performing 1588 time synchronization in the unicast mode, the network elements in the present invention do not need to appoint a unicast intercommunication mode with opposite sides in advance, thereby ensuring intercommunication in any unicast mode.

Description

一种在单播模式下实现1588时间同步的自适应方法An adaptive method for realizing 1588 time synchronization in unicast mode 技术领域Technical field
本发明涉及1588时间同步，具体涉及一种在单播模式下实现1588时间同步的自适应方法。The present invention relates to 1588 time synchronization, and in particular to an adaptive method for implementing 1588 time synchronization in a unicast mode.
背景技术Background technique
1588时间同步技术用来实现网元之间时间上的同步，广泛应用于移动回传场景，来保证4G基站之间正常通信，该技术细节规范于IEEE1588-2008标准中，主要包括建立网元之间的主、从关系(通过比对通告报文携带的时钟质量参数确定网元之间的主、从关系)和计算时间偏差并调整时间两个步骤。IEEE1588-2008标准对1588时间同步技术的讨论主要基于组播模型来展开，而通过单播模型实现时间同步只是作为实现上的可选项，并没有做强制要求，但是在我们实际的应用场景中，特别是对于电信、联通运营商的三层网络，对通过单播模型实现时间同步的需求却更为强烈，目前通过单播模型来实现1588时间同步主要包括以下两种模式：The 1588 time synchronization technology is used to implement time synchronization between network elements and is widely used in mobile backhaul scenarios to ensure normal communication between 4G base stations. The technical details are standardized in the IEEE1588-2008 standard, including the establishment of network elements. The master-slave relationship (determining the master-slave relationship between network elements by comparing the clock quality parameters carried in the advertisement message) and calculating the time offset and adjusting the time are two steps. The discussion of the 1588 time synchronization technology in the IEEE1588-2008 standard is mainly based on the multicast model. However, the time synchronization through the unicast model is only an optional option, and there is no mandatory requirement, but in our actual application scenario, Especially for the three-layer network of telecom and China Unicom operators, the need for time synchronization through the unicast model is more intense. Currently, the 1588 time synchronization through the unicast model mainly includes the following two modes:
(1)协商单播模式。(1) Negotiate unicast mode.
参考IEEE1588-2008标准的第16章节，该标准给出了一种协商的方式用于实现单播模型下的1588时间同步，如图1、图2所示，网元1和网元2都采用协商单播模式，具体为：Refer to the 16th chapter of the IEEE1588-2008 standard, which provides a negotiation mode for implementing 1588 time synchronization in the unicast model. As shown in Figure 1 and Figure 2, both NE 1 and NE 2 are used. Negotiate the unicast mode, specifically:
建立网元时钟主、从关系：Establish the master/slave relationship of the NE clock:
网元(网元1和网元2)周期性向对端网元(网元2或网元1) 发送通告报文单播请求报文；The network element (network element 1 and network element 2) periodically forwards to the peer network element (network element 2 or network element 1). Send a unicast request message for the advertisement message;
网元(网元1和网元2)接收到通告报文单播请求报文，并回复通告报文单播响应报文，无法承诺通告报文单播请求，通告报文单播响应报文包含拒绝通告报文单播请求信息；否则，通告报文单播响应报文包含接受通告报文单播请求信息，并根据其当前端口状态(主时钟)，开始周期性向对端发送通告报文；The network element (the network element 1 and the network element 2) receives the unicast request message of the advertisement message and responds to the unicast response message of the advertisement message. The unicast response message cannot be promised. The unicast request message of the acknowledgment message is included; otherwise, the unicast response message of the advertised message includes the unicast request message of the advertised message, and the unicast request message is sent to the peer end periodically according to the current port status (main clock). ;
网元接收到通告报文单播响应报文，若报文信息为接受通告报文单播请求，并开始发送通告报文，网元准备接收通告报文；否则，修改协商参数，重新发起通告报文单播请求；The NE receives the unicast response packet of the advertisement packet. If the packet information is a unicast request for the advertisement, the network element is ready to receive the advertisement packet. Otherwise, the negotiation parameters are modified and the advertisement is re-initiated. Message unicast request;
网元接收到通告报文，运行最佳主时钟算法决策端口状态，即双方网元都收到通告报文，并运行最佳主时钟算法决策端口状态，主、从关系建立。The NE receives the advertisement packet and runs the optimal master clock algorithm to determine the state of the port. That is, both NEs receive the advertisement packet and run the optimal master clock algorithm to determine the state of the port. The master and slave relationships are established.
主时钟网元计算时钟偏差并调整的处理流程：The main clock network element calculates the clock deviation and adjusts the processing flow:
主时钟网元周期性发送通告报文；The primary clock network element periodically sends an advertisement packet.
主时钟网元接收到对端网元的同步报文单播请求报文，若对该请求无法承诺，回复拒绝对端的请求的同步报文单播响应报文；否则，回复接收对端请求的同步报文单播响应报文，并开始周期性发送同步报文；The master clock network element receives the unicast request packet of the synchronization packet of the peer network element. If the request cannot be promised, the replies to the unicast response packet of the synchronization packet that rejects the request of the peer end; otherwise, the reply receives the request of the peer end. Synchronize the packet unicast response packet, and start to send the synchronization packet periodically.
主时钟网元接收到延时响应报文单播请求报文，若对该请求无法承诺，回复拒绝对端的请求的延时响应报文单播请求响应报文；否则，回复接收对端的请求的延时响应报文单播请求响应报文；The master clock network element receives the unicast request message of the delay response message. If the request cannot be promised, the unicast request response message of the delayed response message rejecting the request of the opposite end is replied; otherwise, the response is received by the peer end. Delay response message unicast request response message;
主时钟网元接收到延时请求报文，如果当前状态为接受响应对端延时请求报文，回复延时请求响应报文；否则，丢弃接收到的延时请求报文，不做任何响应。The master clock network element receives the delay request message, and if the current state is the response response peer delay request message, the response delay response request message; otherwise, the received delay request message is discarded, and no response is received. .
从时钟网元计算偏差并调整的处理流程： The process of calculating the deviation from the clock network element and adjusting it:
从时钟网元周期性发送同步报文单播请求报文；The synchronous network packet unicast request packet is periodically sent from the clock network element.
从时钟网元接收到同步报文单播请求响应报文，若响应报文为接受请求，准备接收同步报文；否则修改协商参数，重新发起请求；Receiving a synchronous message unicast request response message from the clock network element, if the response message is an accept request, preparing to receive the synchronization message; otherwise, modifying the negotiation parameter, and re-initiating the request;
从时钟网元接收到同步报文，正常处理；Receiving a synchronization packet from the clock network element, and processing normally;
从时钟网元周期性发送延时响应报文单播请求报文；Periodically sending a delay response message unicast request message from the clock network element;
从时钟网元接收到延时响应报文单播请求响应报文，若对端已接受请求，开始发送延时请求报文；否则修改协商参数，重新发起请求；Receiving a delay response message unicast request response message from the clock network element, if the peer end has accepted the request, starts to send a delay request message; otherwise, the negotiation parameter is modified, and the request is re-initiated;
从时钟网元接收到延时响应报文，正常处理。The delay response packet is received from the clock network element and processed normally.
(2)强制单播模式。(2) Forced unicast mode.
由于协商单播在标准上是可选项，并没有强制要求，而且实现起来略复杂，所以基于组播模型，各个厂家在实现上又提出了一种新的单播实现方式，相比协商单播，省略掉协商过程，用类组播的方式来实现，如图3、图4所示，网元1和网元2都采用强制单播模式，具体为：。Since negotiation unicast is optional on the standard, there is no mandatory requirement, and it is slightly more complicated to implement. Therefore, based on the multicast model, each manufacturer proposes a new unicast implementation method, which is compared to the negotiation unicast. The negotiation process is omitted and implemented in a multicast-like manner. As shown in FIG. 3 and FIG. 4, both the network element 1 and the network element 2 adopt a mandatory unicast mode, specifically:
建立网元时钟主、从关系：Establish the master/slave relationship of the NE clock:
端口状态为主时钟的网元(网元1和网元2)，主动向对端(网元2和网元1)发送通告报文；The network element (the network element 1 and the network element 2) whose port is the master clock sends the advertisement packet to the peer end (the network element 2 and the network element 1).
网元(网元2和网元1)接收到通告报文，运行最佳主时钟算法决策端口状态。The network element (network element 2 and network element 1) receives the advertisement packet and runs the optimal master clock algorithm to determine the port status.
主时钟网元在计算偏差并调整时的处理流程：The processing flow when the master clock network element calculates the deviation and adjusts:
主时钟网元周期性发送通告报文；The primary clock network element periodically sends an advertisement packet.
主时钟网元周期性发送同步报文；The master clock network element periodically sends synchronization packets.
主时钟网元接收到对端延时请求报文，回复延时响应报文。The master clock network element receives the peer delay request packet and responds with the delay response packet.
从时钟网元在计算偏差并调整时的处理流程：The processing flow when the slave network element calculates the deviation and adjusts:
从时钟网元接收到同步报文，正常处理； Receiving a synchronization packet from the clock network element, and processing normally;
从时钟网元周期性发送延时请求报文；Periodically sending a delay request message from the clock network element;
从时钟网元接收到延时响应报文，正常处理。The delay response packet is received from the clock network element and processed normally.
在上述两种通过单播模型来实现1588时间同步的模式中，存在这样的问题：只有在配置的单播模式(协商单播模式或强制单播模式)相同时，网元间才能互通，如果一边是协商单播模式，另一边是强制单播模式，那么互通上就会存在问题，如图5所示，其中，网元1配置为协商单播模式，网元2配置为强制单播模式，这样只有网元2有机会发送通告报文给网元1，对于网元1，由于网元2不会发送单播请求报文，所以网元1不会主动发送通告报文给网元2，那么当网元1的时钟质量高于网元2时，由于网元2无法获悉网元1的时钟质量信息，从而导致主从关系建立失败，网元2无法与网元1实现1588时间同步。In the above two modes of implementing 1588 time synchronization through the unicast model, there is a problem that the network elements can communicate with each other only when the configured unicast mode (negotiating unicast mode or forced unicast mode) is the same. On one side, the unicast mode is negotiated, and the other is forced unicast mode. As shown in Figure 5, network element 1 is configured to negotiate unicast mode, and network element 2 is configured to force unicast mode. Therefore, only the network element 2 has the opportunity to send an advertisement message to the network element 1 for the network element 1. Since the network element 2 does not send the unicast request message, the network element 1 does not actively send the advertisement message to the network element 2 If the clock quality of the network element 1 is higher than that of the network element 2, the network element 2 cannot learn the clock quality information of the network element 1, and the master/slave relationship fails to be established. The network element 2 cannot synchronize with the network element 1 for 1588 time synchronization. .
因此急需一种不管对端网元工作在哪种单播模式，都能与之进行正常互通的单播模式，从而实现1588时间同步。Therefore, there is an urgent need for a unicast mode in which the unicast mode of the peer network element can be normally interoperable, thereby implementing 1588 time synchronization.
发明内容Summary of the invention
本发明所要解决的技术问题是提供一种能同时与协商单播模式和强制单播模式进行正常互通的自适应方案，从而实现1588时间同步的问题。The technical problem to be solved by the present invention is to provide an adaptive scheme capable of performing normal interworking with both the negotiated unicast mode and the forced unicast mode, thereby realizing the problem of 1588 time synchronization.
为了解决上述技术问题，本发明所采用的技术方案是提供一种在单播模式下实现1588时间同步的自适应方法，包括：In order to solve the above technical problem, the technical solution adopted by the present invention is to provide an adaptive method for implementing 1588 time synchronization in a unicast mode, including:
在建立主、从关系阶段，每个时钟网元的事件处理方式，在协商单播模式主、从关系建立基础上，增加端口状态为主时钟端口主动发送通告报文；In the process of establishing the master-slave relationship, the event processing mode of each clock network element is based on the negotiation of the unicast mode master-slave relationship, and the port state is increased as the master clock port to actively send the advertisement packet;
在计算偏差并调整阶段， In calculating the deviation and adjusting the stage,
主时钟网元的事件处理方式，在协商单播模式主时钟事件处理方式基础上，增加主动发送同步报文，并在没有接收对端延时响应报文单播请求报文的情况下，收到延时请求报文，直接发送延时请求响应报文；The event processing mode of the master clock network element is based on the negotiation of the unicast mode master clock event processing mode, and the method of receiving the unicast request message of the peer delay response message is received. Sending a delay request response message directly to the delay request message;
从时钟网元的事件处理方式，在协商单播模式从时钟事件处理方式基础上，增加主动发送延时请求报文。Based on the event processing mode of the clock network element, the active unicast delay request message is added on the basis of the negotiation of the unicast mode from the clock event processing mode.
在上述方法中，在建立主、从关系阶段，每个时钟网元的事件处理方式具体为：In the above method, in the establishment of the master-slave relationship phase, the event processing manner of each clock network element is specifically:
周期性发送通告报文单播请求报文和通告报文；The unicast request packet and the advertisement packet of the advertisement packet are periodically sent.
在接收到通告报文单播请求报文时，若对该请求无法承诺，响应拒绝对端请求的通告报文单播请求响应报文；否则，响应接受对端请求的通告报文单播请求响应报文；If the unicast request packet is received, the unicast request response message is rejected in response to the refusal of the peer request. Otherwise, the unicast request is received in response to the peer request. Response message
在接收到通告报文单播请求响应报文时，若响应报文为对端接受请求，并开始发送通告报文，则准备接收通告报文；否则，修改协商参数，重新发起通告报文单播请求；When receiving the unicast request response message, if the response message is received by the peer and the advertised message is sent, the message is ready to receive the advertised message; otherwise, the negotiation parameter is modified, and the advertised message list is re-initiated. Broadcast request
在接收到通告报文时，运行最佳主时钟算法决策端口状态。When receiving an advertisement message, the best master clock algorithm is run to determine the port status.
在上述方法中，在计算偏差并调整阶段，In the above method, in calculating the deviation and adjusting the stage,
主时钟网元的事件处理方式具体为：The event processing mode of the master clock NE is specifically as follows:
周期性发送通告报文和同步报文；Periodically send advertisement packets and synchronization packets.
在接收到同步报文单播请求报文时，若对该请求无法承诺，响应拒绝对端请求的同步报文单播请求响应报文；否则，响应接受同步报文单播请求响应报文；If the unicast request packet is received, the unicast request response message is rejected in response to the request, and the unicast request response message is received in response to the synchronization message;
在接收到延时响应报文单播请求报文时，若对该请求无法承诺，响应拒绝对端请求的延时响应报文单播请求响应报文；否则，响应接受对端请求的延时响应报文单播请求响应报文； If the unicast request packet of the delay response message is received, if the request cannot be promised, the unicast request response message is rejected in response to the request for rejecting the peer request; otherwise, the response is delayed by the peer request. Response message unicast request response message;
在接收到延时请求报文时，无论是否接收到延时响应报文单播请求报文，都直接响应延时请求响应报文；When receiving the delay request message, the device directly responds to the delay request response message regardless of whether the unicast request message of the delay response message is received.
从时钟网元的事件处理方式具体为：The event processing method of the slave clock network element is specifically as follows:
周期性发送同步报文单播请求报文；Periodically sending a synchronous message unicast request message;
在接收到同步报文单播请求响应报文时，若对端已接受同步报文单播请求，准备接收同步报文，并正常处理；否则，修改协商参数，重新发起同步报文单播请求；Upon receiving the unicast request response packet, if the peer has received the unicast request for the synchronization packet, it is ready to receive the synchronization packet and process it normally; otherwise, modify the negotiation parameters and re-initiate the synchronization packet unicast request. ;
周期性发送延时响应报文单播请求报文；Periodically sending a delay response message unicast request message;
在接收到延时响应报文单播请求响应报文时，若对端已接受延时响应报文单播请求，不做任何处理；否则，修改协商参数，重新发起该请求；When receiving the unicast request response message of the delay response message, if the peer end has accepted the unicast request for the delayed response message, no processing is performed; otherwise, the negotiation parameter is modified, and the request is re-initiated;
无论是否接收到延时响应报文单播请求响应报文，都主动发送延时请求报文。The delay request message is actively sent regardless of whether the unicast request response message of the delay response message is received.
本发明通过对协商单播模式进行改进，得到一种可以与协商单播模式和强制单播模式互通的自适应方法(自适应单播模式)实现网元间的1588时间同步；采用本发明的网元在单播模式下进行1588时间同步时，不需要事先与对端约定单播互通模式，可以保证任何单播模式的网元互通，特别适用于不同厂家设备之间的互通。The present invention improves the negotiated unicast mode, and obtains an adaptive method (adaptive unicast mode) that can communicate with the negotiated unicast mode and the forced unicast mode to implement 1588 time synchronization between network elements; When the network element performs the 1588 time synchronization in unicast mode, the unicast interworking mode is not required to be agreed with the peer end. This ensures that any unicast mode NEs can communicate with each other. This is especially applicable to interworking between devices of different vendors.
附图说明DRAWINGS
图1为在协商单播模式下网元间建立主、从关系的流程图；FIG. 1 is a flowchart of establishing a master-slave relationship between network elements in a negotiated unicast mode;
图2为在协商单播模式下网元间计算偏差并调整的流程图；2 is a flow chart of calculating deviations and adjusting between network elements in a negotiated unicast mode;
图3为在强制单播模式下网元间建立主、从关系的流程图；3 is a flowchart of establishing a master-slave relationship between network elements in a forced unicast mode;
图4为在协商单播模式下网元间计算偏差并调整的流程图；4 is a flow chart of calculating deviations and adjusting between network elements in a negotiated unicast mode;
图5为配置为协商模式和配置为强制模式的网元间建立主、从关 系的流程图；Figure 5 shows the establishment of master and slave between NEs configured in negotiation mode and forced mode. Flow chart of the system;
图6为配置本发明提供的单播方法和配置协商模式的网元间建立主、从关系的流程图；6 is a flowchart of establishing a master-slave relationship between network elements configured by the unicast method and the configuration negotiation mode provided by the present invention;
图7为配置本发明提供的单播方法的主时钟网元和配置协商模式的从时钟网元间计算偏差并调整的流程图；7 is a flowchart of calculating a deviation and adjusting between a master clock network element of a unicast method provided by the present invention and a slave clock network element in a configuration negotiation mode;
图8为配置本发明提供的单播方法的从时钟网元和配置协商模式的主时钟网元间计算偏差并调整的流程图；8 is a flowchart of calculating a deviation and adjusting between a slave clock network element and a master clock network element in a configuration negotiation mode according to the unicast method provided by the present invention;
图9为配置本发明提供的单播方法和配置强制模式的网元间建立主、从关系的流程图；9 is a flowchart of establishing a master-slave relationship between network elements configured by the unicast method and the mandatory mode provided by the present invention;
图10为配置本发明提供的单播方法的主时钟网元和配置强制模式的从时钟网元间计算偏差并调整的流程图；10 is a flowchart of calculating a deviation and adjusting between a master clock network element of a unicast method provided by the present invention and a slave clock network element configured in a mandatory mode;
图11为配置本发明提供的单播方法的从时钟网元和配置强制模式的主时钟网元间计算偏差并调整的流程图；11 is a flowchart of calculating a deviation and adjusting between a slave clock network element and a master clock network element configured in a mandatory mode according to the unicast method provided by the present invention;
图12为配置本发明提供的单播方法的网元间建立主、从关系的流程图；12 is a flowchart of establishing a master-slave relationship between network elements configuring a unicast method provided by the present invention;
图13为配置都为本发明提供的单播方法的主时钟网元和从时钟网元间计算偏差并调整的流程图。FIG. 13 is a flowchart of calculating and adjusting a deviation between a master clock network element and a slave clock network element in a unicast method provided by the present invention.
具体实施方式detailed description
下面结合说明书附图和具体实施例对本发明做出详细的说明。The present invention will be described in detail below with reference to the drawings and specific embodiments.
本发明提供的一种在单播模式下实现1588时间同步的自适应方法，分别从1588时间同步的两个阶段对协商单播模式进行了如下优化：The present invention provides an adaptive method for implementing 1588 time synchronization in a unicast mode, and optimizes the negotiated unicast mode from two phases of 1588 time synchronization respectively:
在建立主、从关系阶段，每个时钟网元的事件处理方式，在协商单播模式主、从关系建立基础上，增加端口状态为主时钟端口主动发 送通告报文；In the establishment of the master-slave relationship phase, the event processing mode of each clock network element is based on the negotiation of the unicast mode master and slave relationship establishment, and the port state is increased as the master clock port. Send a notification message;
在计算偏差并调整阶段，In calculating the deviation and adjusting the stage,
主时钟网元的事件处理方式，在协商单播模式主时钟事件处理方式基础上，增加主动发送同步报文，并在没有接收对端延时响应报文单播请求报文的情况下，收到延时请求报文，直接发送延时请求响应报文；The event processing mode of the master clock network element is based on the negotiation of the unicast mode master clock event processing mode, and the method of receiving the unicast request message of the peer delay response message is received. Sending a delay request response message directly to the delay request message;
从时钟网元的事件处理方式，在协商单播模式从时钟事件处理方式基础上，增加主动发送延时请求报文。Based on the event processing mode of the clock network element, the active unicast delay request message is added on the basis of the negotiation of the unicast mode from the clock event processing mode.
在建立主、从关系阶段，每个时钟网元的事件处理方式具体为：In the establishment of the master-slave relationship phase, the event handling method of each clock network element is specifically:
周期性发送通告报文单播请求报文；Periodically sending an advertised message unicast request message;
在接收到通告报文单播请求报文时，若对该请求无法承诺，响应拒绝对端请求的通告报文单播请求响应报文；否则，响应接受对端请求的通告报文单播请求响应报文；If the unicast request packet is received, the unicast request response message is rejected in response to the refusal of the peer request. Otherwise, the unicast request is received in response to the peer request. Response message
在接收到通告报文单播请求响应报文时，若响应报文为对端接受请求，并开始发送通告报文，则准备接收通告报文；否则，修改协商参数，重新发起通告报文单播请求；When receiving the unicast request response message, if the response message is received by the peer and the advertised message is sent, the message is ready to receive the advertised message; otherwise, the negotiation parameter is modified, and the advertised message list is re-initiated. Broadcast request
当前端口状态是主时钟时，主动发送通告报文，无需等待对端发送通告报文单播请求报文；If the current port status is the primary clock, the device automatically sends the advertisement packet without waiting for the peer to send the advertisement packet unicast request packet.
在接收到通告报文时，运行最佳主时钟算法决策端口状态。When receiving an advertisement message, the best master clock algorithm is run to determine the port status.
在本发明中，初始双方网元端口状态都是主时钟状态，然后通过收发通告报文建立主、从关系，在第一阶段结束的时候(主、从关系已建立)，此时只有主时钟网元端口周期性发送通告报文，从时钟网元端口只接收不发送；当网元(从时钟网元)在一段时间内没有收到对端发来的通告报文，那么该网元端口状态会直接进入主时钟状态，使主时钟状态一定会存在。 In the present invention, the initial network element port states are both master clock states, and then the master and slave relationships are established by sending and receiving advertisement messages. At the end of the first phase (the master and slave relationships have been established), only the master clock is available at this time. The network element port periodically sends an advertisement packet, and the slave network element port only receives the advertisement packet. If the network element (the slave clock network element) does not receive the advertisement packet sent by the peer end within a certain period of time, the network element port The state will go directly to the main clock state, so that the main clock state must exist.
在计算偏差并调整阶段，In calculating the deviation and adjusting the stage,
主时钟网元的事件处理方式具体为：The event processing mode of the master clock NE is specifically as follows:
进入主时钟状态后，周期性发送通告报文以及同步报文，无需等待对端发送同步报文单播请求报文；After the master clock is configured, the device sends the advertisement packet and the synchronization packet periodically. The device does not need to wait for the peer to send the synchronization packet unicast request packet.
在接收到同步报文单播请求报文时，若对该请求无法承诺，响应拒绝对端请求的同步报文单播请求响应报文；否则，响应接受同步报文单播请求响应报文；If the unicast request packet is received, the unicast request response message is rejected in response to the request, and the unicast request response message is received in response to the synchronization message;
在接收到延时响应报文单播请求报文时，若对该请求无法承诺，响应拒绝对端请求的延时响应报文单播请求响应报文；否则，响应接受对端请求的延时响应报文单播请求响应报文；If the unicast request packet of the delay response message is received, if the request cannot be promised, the unicast request response message is rejected in response to the request for rejecting the peer request; otherwise, the response is delayed by the peer request. Response message unicast request response message;
在接收到延时请求报文时，无论是否接收到延时响应报文单播请求报文，都直接响应延时请求响应报文，即无需等待对端发送延时响应报文单播请求报文。When receiving a delay request message, the device directly responds to the delay request response message regardless of whether the unicast request message of the delay response message is received, that is, it does not need to wait for the peer end to send the delay response message unicast request message. Text.
从时钟网元的事件处理方式具体为：The event processing method of the slave clock network element is specifically as follows:
周期性发送同步报文单播请求报文；Periodically sending a synchronous message unicast request message;
在接收到同步报文单播请求响应报文时，若对端已接受同步报文单播请求，准备接收同步报文，并正常处理；否则，修改协商参数，重新发起同步报文单播请求；Upon receiving the unicast request response packet, if the peer has received the unicast request for the synchronization packet, it is ready to receive the synchronization packet and process it normally; otherwise, modify the negotiation parameters and re-initiate the synchronization packet unicast request. ;
周期性发送延时响应报文单播请求报文(进入从时钟状态后开始发送)；Periodically sending a delay response message to a unicast request message (sending after entering the slave clock state);
在接收到延时响应报文单播请求响应报文时，若对端已接受延时响应报文单播请求，不做任何处理；否则，修改协商参数，重新发起该请求；When receiving the unicast request response message of the delay response message, if the peer end has accepted the unicast request for the delayed response message, no processing is performed; otherwise, the negotiation parameter is modified, and the request is re-initiated;
无论是否接收到延时响应报文单播请求响应报文，都主动发送延时请求报文，即无需等待对端的延时响应报文单播请求响应报文。 The unicast request response message is automatically sent, regardless of whether the unicast request response message is received, that is, the unicast request response message is not required to wait for the delay response message of the peer end.
本发明与强制单播模式相比，在建立主、从关系阶段，增加了单播协商机制；在计算偏差并调整阶段，主时钟网元增加响应单播请求机制；从时钟网元增加发起单播请求机制。Compared with the forced unicast mode, the present invention increases the unicast negotiation mechanism in the establishment of the master-slave relationship phase; in the calculation deviation and adjustment phase, the master clock network element increases the response unicast request mechanism; Broadcast request mechanism.
本发明与协商单播模式互通的处理方式如下：The processing method of the present invention and the negotiating unicast mode are as follows:
在建立主、从关系阶段，如图6所示，网元1配置为本发明提供的自适应单播模式，网元2配置为协商单播模式，具体流程为：In the stage of establishing the master-slave relationship, as shown in FIG. 6, the network element 1 is configured to be the adaptive unicast mode provided by the present invention, and the network element 2 is configured to negotiate the unicast mode. The specific process is as follows:
网元1周期性发送通告报文单播请求报文和通告报文；The network element 1 periodically sends an advertised message unicast request message and an advertisement message;
网元2接收到通告报文单播请求报文，回复通告报文单播请求响应报文，并开始发送通告报文；The network element 2 receives the unicast request message of the advertisement message, responds to the unicast request response message of the advertisement message, and starts to send the advertisement message;
网元1接收到通告报文单播请求响应报文，若响应报文为对端接受请求，并开始发送通告报文，则准备接收通告报文；否则，修改协商参数，重新发起通告报文单播请求；The network element 1 receives the unicast request response message of the advertisement message. If the response message is received by the peer end and the advertisement message is sent, the network element 1 is ready to receive the advertisement message. Otherwise, the negotiation parameter is modified and the advertisement message is re-initiated. Unicast request;
网元1接收到通告报文，运行最佳主时钟算法决策端口状态。NE 1 receives the advertisement packet and runs the optimal master clock algorithm to determine the port status.
网元2周期性发送通告报文单播请求报文；The network element 2 periodically sends an advertised message unicast request message.
网元1接收到通告报文单播请求报文，回复通告报文单播请求响应报文；The network element 1 receives the unicast request message of the advertisement message, and responds to the unicast request response message of the advertisement message;
网元2接收到通告报文单播请求响应报文，若响应报文为对端接受请求，并开始发送通告报文(网元1一直在周期性发送通告报文)，则准备接收通告报文；否则，修改协商参数，重新发起通告报文单播请求；The network element 2 receives the unicast request response message of the advertisement message. If the response message is the peer end accepting the request and starts to send the advertisement message (the network element 1 is always sending the advertisement message periodically), the network element 2 is ready to receive the notification message. Otherwise; modify the negotiation parameters and re-initiate the unicast request for the advertisement message;
网元2接收到通告报文，运行最佳主时钟算法决策端口状态。NE 2 receives the advertisement packet and runs the optimal master clock algorithm to determine the port status.
可见，双方都可以收到对端的通告报文，主、从关系成功建立。It can be seen that both parties can receive the notification message from the peer end, and the master and slave relationship are successfully established.
在计算偏差并调整阶段，分别对以下两种情况进行说明。In the calculation of the deviation and adjustment phase, the following two cases are explained separately.
第一种情况：如图7所示，主时钟网元1配置自适应单播模式，从时钟网元2配置协商单播模式，具体流程为： In the first case, as shown in FIG. 7, the primary clock network element 1 is configured with an adaptive unicast mode, and the slave clock network element 2 is configured to negotiate a unicast mode. The specific process is as follows:
网元1周期性发送通告报文和同步报文；The network element 1 periodically sends an advertisement packet and a synchronization packet.
网元2周期性发送同步报文单播请求报文；The network element 2 periodically sends a synchronous message unicast request message.
网元1接收到同步报文单播请求报文，并回复同步报文单播请求响应报文；The network element 1 receives the synchronization message unicast request message, and responds to the synchronization message unicast request response message;
网元2接收到步报文单播请求响应报文，若该响应报文为接受请求，则准备接受同步报文，并正常处理接收到的同步报文；否则，修改协商参数，重新发起请求；The network element 2 receives the step message unicast request response message, and if the response message is an accept request, it is ready to accept the synchronization message and normally processes the received synchronization message; otherwise, the negotiation parameter is modified, and the request is re-initiated. ;
网元2周期性发送延时响应报文单播请求报文；The network element 2 periodically sends a delay response message unicast request message;
网元1接收到延时响应报文单播请求报文，并响应延时响应报文单播请求响应报文；The network element 1 receives the unicast request message of the delayed response message, and responds to the delayed response message unicast request response message;
网元2接收延时响应报文单播请求响应报文，若该响应报文为接受请求，开始发送延时请求报文；否则，修改协商参数，重新发起请求；The network element 2 receives the delay response message unicast request response message, and if the response message is an accept request, starts to send the delay request message; otherwise, the negotiation parameter is modified, and the request is re-initiated;
网元1接收到延时请求报文，直接响应延时请求报文。The network element 1 receives the delay request message and directly responds to the delay request message.
可见在此情况下，从时钟网元2可以正常的收到同步报文和延时响应报文，从而实现计算偏差调整。It can be seen that in this case, the slave clock network element 2 can normally receive the synchronization message and the delay response message, thereby implementing the calculation offset adjustment.
第二种情况：如图8所示，主时钟网元1配置协商单播模式，从时钟网元2配置自适应单播模式，具体流程为：In the second case, as shown in FIG. 8, the primary clock network element 1 is configured to negotiate a unicast mode, and the secondary network mode is configured from the clock network element 2, and the specific process is as follows:
网元1周期性发送通告报文；The network element 1 periodically sends an advertisement message.
网元2周期性发送同步报文单播请求报文；The network element 2 periodically sends a synchronous message unicast request message.
网元1接收到同步报文单播请求报文，响应同步报文单播请求响应报文，并开始周期性发送同步报文；The network element 1 receives the synchronization message unicast request message, responds to the synchronization message unicast request response message, and starts to periodically send the synchronization message;
网元2接收到同步报文单播请求响应报文，若该响应报文为接受请求，则准备接受同步报文，并正常处理接收到的同步报文；否则，修改协商参数，重新发起请求； The network element 2 receives the synchronization message unicast request response message, and if the response message is an acceptance request, it prepares to accept the synchronization message and processes the received synchronization message normally; otherwise, the negotiation parameter is modified, and the request is re-initiated. ;
网元2周期性发送延时响应报文单播请求报文和延时请求报文；The network element 2 periodically sends a delay response message unicast request message and a delay request message;
网元1接收到延时响应报文单播请求报文，若接收该请求则响应延时响应报文单播请求响应报文；否则，丢弃延时响应报文单播请求报文；The network element 1 receives the unicast request message of the delayed response message, and if it receives the request, responds to the unicast request response message of the delayed response message; otherwise, the unicast request message of the delayed response message is discarded;
网元2若接收延时响应报文单播请求响应报文，则该响应报文为接受请求，不作任何处理；否则，修改协商参数，重新发起请求；If the network element 2 receives the unicast request response message of the delay response message, the response message is an accept request, and no processing is performed; otherwise, the negotiation parameter is modified, and the request is re-initiated;
网元1接收到延时请求报文，直接响应延时请求报文。The network element 1 receives the delay request message and directly responds to the delay request message.
可见在此情况下，从时钟网元2可以正常的收到同步报文和延时响应报文，从而实现计算偏差调整。It can be seen that in this case, the slave clock network element 2 can normally receive the synchronization message and the delay response message, thereby implementing the calculation offset adjustment.
本发明(自适应单播模式)与强制单播模式互通的处理方式如下：The processing method of the invention (adaptive unicast mode) and the forced unicast mode is as follows:
在建立主、从关系阶段，如图9所示，网元1配置为本发明提供的自适应单播模式，网元2配置为强制单播模式，具体流程为：In the stage of establishing the master-slave relationship, as shown in FIG. 9, the network element 1 is configured as the adaptive unicast mode provided by the present invention, and the network element 2 is configured as the mandatory unicast mode. The specific process is as follows:
网元1周期性发送通告报文单播请求报文；The network element 1 periodically sends an advertised message unicast request message.
网元2接收到通告报文单播请求报文，不作任何处理；The network element 2 receives the unicast request message for the advertisement message and does not perform any processing.
网元1周期性发送通告报文；The network element 1 periodically sends an advertisement message.
网元2接收到通告报文，运行最佳主时钟算法决策端口状态；The network element 2 receives the advertisement packet and runs the optimal master clock algorithm to determine the port status.
网元2周期性的发送通告报文；The network element 2 periodically sends an advertisement message.
网元1接收到通告报文，运行最佳主时钟算法决策端口状态。NE 1 receives the advertisement packet and runs the optimal master clock algorithm to determine the port status.
可见，网元1和网元2都可以收到对端的通告报文，主、从关系可以成功建立。It can be seen that both the network element 1 and the network element 2 can receive the advertisement message of the peer end, and the master and slave relationships can be successfully established.
在计算偏差并调整阶段，分别对以下两种情况进行说明。In the calculation of the deviation and adjustment phase, the following two cases are explained separately.
第一种情况：如图10所示，主时钟网元1配置自适应单播模式，从时钟网元2配置强制单播模式，具体流程为：In the first case, as shown in FIG. 10, the primary clock network element 1 is configured with an adaptive unicast mode, and the slave clock network element 2 is configured with a mandatory unicast mode. The specific process is as follows:
网元1周期性发送通告报文和同步报文；The network element 1 periodically sends an advertisement packet and a synchronization packet.
网元2接收到同步报文，正常处理； The network element 2 receives the synchronization packet and processes it normally.
网元2周期性发送延时请求报文；The network element 2 periodically sends a delay request message.
网元1接收延时请求报文，直接响应延时请求响应报文；The network element 1 receives the delay request message and directly responds to the delay request response message;
网元2接收到延时请求响应报文，正常处理。The network element 2 receives the delay request response message and processes it normally.
可见，在该情况下，从时钟网元2可以正常的收到同步报文和延时响应报文，并完成计算偏差调整。It can be seen that in this case, the slave clock network element 2 can normally receive the synchronization message and the delay response message, and complete the calculation offset adjustment.
第二种情况：如图11所示，主时钟网元1配置强制单播模式，从时钟网元2配置自适应单播模式，具体流程为：The second case is as follows: As shown in FIG. 11, the primary clock network element 1 is configured with a forced unicast mode, and the secondary network mode of the slave clock network element 2 is configured.
网元1周期性发送通告报文；The network element 1 periodically sends an advertisement message.
网元2周期性发送同步报文单播请求报文；The network element 2 periodically sends a synchronous message unicast request message.
网元1收到同步报文单播请求报文，不作任何响应；The network element 1 receives the unicast request packet of the synchronization packet and does not respond.
网元1周期性发送同步报文；The network element 1 periodically sends synchronization packets.
网元2收到同步报文，正常处理；The network element 2 receives the synchronization packet and processes it normally.
网元2周期性的发送延时响应报文单播请求报文；The network element 2 periodically sends a delay response message to the unicast request message.
网元1接收到延时响应报文单播请求报文，不作任何响应；The network element 1 receives the unicast request message of the delayed response message and does not respond.
网元2周期性的发送延时请求报文；The network element 2 periodically sends a delay request message;
网元1接收到延时请求报文，响应延时请求响应报文。The network element 1 receives the delay request message and responds to the delay request response message.
可见在此情况下，从时钟网元2可以正常的收到同步报文和延时响应报文，从而完成计算偏差调整，在在偏差调整阶段，通告报文的作用已经不再是第一阶段时建立双方的主、从关系，而是用于维持双方的主、从关系，从时钟网元只有持续不断的收到对端的通告报文才会认为主时钟一直存在；否则就会自动将端口状态变为主时钟状态，开始重新建立新的主、从关系。It can be seen that in this case, the slave clock network element 2 can normally receive the synchronization message and the delay response message, thereby completing the calculation deviation adjustment. In the deviation adjustment phase, the role of the notification message is no longer the first stage. The master and slave relationships of the two parties are established, but the master and slave relationships are maintained. The clock source only keeps receiving the notification message from the peer end until the master clock is always present; otherwise, the port will be automatically The state changes to the master clock state and begins to re-establish a new master-slave relationship.
采用本发明提供的自适应单播模式的网元之间互通的处理方式如下：The interworking between the network elements in the adaptive unicast mode provided by the present invention is as follows:
在建立主、从关系阶段，如图12所示，网元1配置为自适应单 播模式，网元2配置为自适应单播模式，具体流程如下：In the establishment of the master-slave relationship phase, as shown in FIG. 12, the network element 1 is configured as an adaptive single. In the broadcast mode, NE 2 is configured as an adaptive unicast mode. The specific process is as follows:
网元1和网元2分别周期性发送通告报文单播请求报文和通过报文；The network element 1 and the network element 2 periodically send the unicast request message and the pass message of the advertisement message respectively.
网元2和网元1分别接收到通告报文单播请求报文，响应通告报文单播请求响应报文；The network element 2 and the network element 1 respectively receive the unicast request message of the advertisement message, and respond to the unicast request response message of the advertisement message;
网元1和网元2分别接收到通告报文单播请求响应报文，若响应报文为对端接受请求，并开始发送通告报文，则准备接收通告报文；否则，修改协商参数，重新发起通告报文单播请求；The network element 1 and the network element 2 respectively receive the unicast request response message of the advertisement message, and if the response message is the peer end accepting the request and starts to send the advertisement message, it is ready to receive the advertisement message; otherwise, the negotiation parameter is modified. Re-initiating a unicast request for an advertisement message;
网元1和网元2分别接收到通告报文，运行最佳主时钟算法决策端口状态。The network element 1 and the network element 2 respectively receive the advertisement packet, and run the optimal master clock algorithm to determine the state of the port.
可见，网元1和网元2都可以收到对端的通告报文，主从、关系成功建立。It can be seen that both the network element 1 and the network element 2 can receive the advertisement message of the peer end, and the master-slave relationship and the relationship are successfully established.
在计算偏差并调整阶段，如图13所示，主时钟网元1和从时钟网元2都配置为自适应单播模式，具体流程如下：In the calculation of the deviation and adjustment phase, as shown in FIG. 13, both the primary clock network element 1 and the secondary clock network element 2 are configured in an adaptive unicast mode, and the specific process is as follows:
网元1周期性发送通告报文；The network element 1 periodically sends an advertisement message.
网元2周期性发送同步报文单播请求报文；The network element 2 periodically sends a synchronous message unicast request message.
网元1接收同步报文单播请求报文，响应同步报文单播请求响应报文和同步报文；The network element 1 receives the synchronization message unicast request message, and responds to the synchronization message unicast request response message and the synchronization message;
网元2接收同步报文单播请求响应报文，若对端已接受同步报文单播请求，准备接收同步报文，并正常处理同步报文；否则，修改协商参数，重新发起同步报文单播请求；The network element 2 receives the synchronous message unicast request response message. If the peer end accepts the synchronization message unicast request, it prepares to receive the synchronization message and processes the synchronization message normally; otherwise, the negotiation parameter is modified, and the synchronization message is re-initiated. Unicast request;
网元2周期性发送延时响应报文单播请求报文和延时请求报文；The network element 2 periodically sends a delay response message unicast request message and a delay request message;
网元1接收到延时响应报文单播请求报文，响应延时响应报文单播请求响应报文；The network element 1 receives the unicast request message of the delayed response message, and responds to the delay response message unicast request response message;
网元2接收到延时响应报文单播请求响应报文，若对端已接受延 时响应报文单播请求，不做任何处理；否则，修改协商参数，重新发起该请求；The network element 2 receives the unicast request response message of the delayed response message, and if the peer end has accepted the extension Respond to the message unicast request, do not do any processing; otherwise, modify the negotiation parameters and re-initiate the request;
网元1接收到延时请求报文，直接响应延时请求相应报文。The network element 1 receives the delay request message and directly responds to the delay request for the corresponding message.
可见，当主时钟网元1和从时钟网元2均工作在自适应单播模式下时，从时钟可以正常的收到同步报文和延时响应报文，并完成计算偏差调整。It can be seen that when both the master clock network element 1 and the slave clock network element 2 are working in the adaptive unicast mode, the slave clock can normally receive the synchronization message and the delay response message, and complete the calculation offset adjustment.
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。 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 modifications of the invention

Claims (3)

  1. 一种在单播模式下实现1588时间同步的自适应方法，其特征在于，An adaptive method for implementing 1588 time synchronization in unicast mode, characterized in that
    在建立主、从关系阶段，每个时钟网元的事件处理方式，在协商单播模式主、从关系建立基础上，增加端口状态为主时钟端口主动发送通告报文；In the process of establishing the master-slave relationship, the event processing mode of each clock network element is based on the negotiation of the unicast mode master-slave relationship, and the port state is increased as the master clock port to actively send the advertisement packet;
    在计算偏差并调整阶段，In calculating the deviation and adjusting the stage,
    主时钟网元的事件处理方式，在协商单播模式主时钟事件处理方式基础上，增加主动发送同步报文，并在没有接收对端延时响应报文单播请求报文的情况下，收到延时请求报文，直接发送延时请求响应报文；The event processing mode of the master clock network element is based on the negotiation of the unicast mode master clock event processing mode, and the method of receiving the unicast request message of the peer delay response message is received. Sending a delay request response message directly to the delay request message;
    从时钟网元的事件处理方式，在协商单播模式从时钟事件处理方式基础上，增加主动发送延时请求报文。Based on the event processing mode of the clock network element, the active unicast delay request message is added on the basis of the negotiation of the unicast mode from the clock event processing mode.
  2. 如权利要求1所述的方法，其特征在于，在建立主、从关系阶段，每个时钟网元的事件处理方式具体为：The method according to claim 1, wherein in the establishing the master-slave relationship phase, the event processing manner of each clock network element is specifically:
    周期性发送通告报文单播请求报文和通告报文；The unicast request packet and the advertisement packet of the advertisement packet are periodically sent.
    在接收到通告报文单播请求报文时，若对该请求无法承诺，响应拒绝对端请求的通告报文单播请求响应报文；否则，响应接受对端请求的通告报文单播请求响应报文；If the unicast request packet is received, the unicast request response message is rejected in response to the refusal of the peer request. Otherwise, the unicast request is received in response to the peer request. Response message
    在接收到通告报文单播请求响应报文时，若响应报文为对端接受请求，并开始发送通告报文，则准备接收通告报文；否则，修改协商参数，重新发起通告报文单播请求；When receiving the unicast request response message, if the response message is received by the peer and the advertised message is sent, the message is ready to receive the advertised message; otherwise, the negotiation parameter is modified, and the advertised message list is re-initiated. Broadcast request
    在接收到通告报文时，运行最佳主时钟算法决策端口状态。When receiving an advertisement message, the best master clock algorithm is run to determine the port status.
  3. 如权利要求2所述的方法，其特征在于，在计算偏差并调整阶段， The method of claim 2, wherein in calculating the deviation and adjusting the phase,
    主时钟网元的事件处理方式具体为：The event processing mode of the master clock NE is specifically as follows:
    周期性发送通告报文和同步报文；Periodically send advertisement packets and synchronization packets.
    在接收到同步报文单播请求报文时，若对该请求无法承诺，响应拒绝对端请求的同步报文单播请求响应报文；否则，响应接受同步报文单播请求响应报文；If the unicast request packet is received, the unicast request response message is rejected in response to the request, and the unicast request response message is received in response to the synchronization message;
    在接收到延时响应报文单播请求报文时，若对该请求无法承诺，响应拒绝对端请求的延时响应报文单播请求响应报文；否则，响应接受对端请求的延时响应报文单播请求响应报文；If the unicast request packet of the delay response message is received, if the request cannot be promised, the unicast request response message is rejected in response to the request for rejecting the peer request; otherwise, the response is delayed by the peer request. Response message unicast request response message;
    在接收到延时请求报文时，无论是否接收到延时响应报文单播请求报文，都直接响应延时请求响应报文；When receiving the delay request message, the device directly responds to the delay request response message regardless of whether the unicast request message of the delay response message is received.
    从时钟网元的事件处理方式具体为：The event processing method of the slave clock network element is specifically as follows:
    周期性发送同步报文单播请求报文；Periodically sending a synchronous message unicast request message;
    在接收到同步报文单播请求响应报文时，若对端已接受同步报文单播请求，准备接收同步报文，并正常处理；否则，修改协商参数，重新发起同步报文单播请求；Upon receiving the unicast request response packet, if the peer has received the unicast request for the synchronization packet, it is ready to receive the synchronization packet and process it normally; otherwise, modify the negotiation parameters and re-initiate the synchronization packet unicast request. ;
    周期性发送延时响应报文单播请求报文；Periodically sending a delay response message unicast request message;
    在接收到延时响应报文单播请求响应报文时，若对端已接受延时响应报文单播请求，不做任何处理；否则，修改协商参数，重新发起该请求；When receiving the unicast request response message of the delay response message, if the peer end has accepted the unicast request for the delayed response message, no processing is performed; otherwise, the negotiation parameter is modified, and the request is re-initiated;
    无论是否接收到延时响应报文单播请求响应报文，都主动发送延时请求报文。 The delay request message is actively sent regardless of whether the unicast request response message of the delay response message is received.
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