WO2021073570A1

WO2021073570A1 - Communication method, apparatus and system

Info

Publication number: WO2021073570A1
Application number: PCT/CN2020/121129
Authority: WO
Inventors: 邹育泉; 朱赟; 李云星; 祁云磊
Original assignee: 华为技术有限公司
Priority date: 2019-10-18
Filing date: 2020-10-15
Publication date: 2021-04-22
Also published as: CN112688751A

Abstract

Embodiments of the present application relate to the field of communications. Disclosed are a communication method, apparatus and method. The method comprises: a first forwarding node receives a first service message, the first forwarding node being another node, other than an end node, through which a transmission tunnel passes, and the transmission tunnel being a tunnel for transmitting the first service message; the first forwarding node obtains a residence time of the first service message in the first forwarding node; the first forwarding node sends a second service message, which comprises the residence time. By using the solution of the present application, the accuracy of calculation on service message transmission time is improved, so that it is ensured that a change value in transmission time, over a transmission tunnel, of service messages received by a power device each time does not exceed a preset threshold.

Description

Communication method, device and system

This application claims the priority of a Chinese patent application filed with the Chinese Patent Office with application number 201910996343.0 and titled "Communication Method, Device and System" on October 18, 2019, the entire content of which is incorporated into this application by reference.

Technical field

This application relates to the field of communication, and in particular to a communication method, device and system.

Background technique

In the power industry, the relay protection business between power equipment can be transmitted through the communication network. The communication network is composed of forwarding nodes, and power equipment can be connected to the forwarding nodes in the communication network. For the two power devices that need to transmit relay protection services, they are called the first power device and the second power device for the convenience of description, the first forwarding node connected to the first power device and the second forwarding node connected to the second power device A first transmission tunnel and a second transmission tunnel are established between the nodes. The first transmission tunnel takes the first forwarding node as the head node and the second forwarding node as the end node, and is used to transmit the relay protection service sent by the first power device to the second power device. The second transmission tunnel takes the second forwarding node as the head node and the first forwarding node as the end node, and is used to transmit the relay protection service sent by the second power device to the first power device.

In the power industry, the stability of the transmission time of the relay protection business in the transmission tunnel has high requirements. The requirement is that the change in the transmission time of the relay protection service in the first transmission tunnel each time the first power device sends to the second power device does not exceed the preset threshold, and the second power device sends the same to the first power device. The relay protection business also has this requirement. In order to meet this requirement, the first forwarding node and the second forwarding node receive a clock signal from the same clock source, and the two perform time synchronization based on the clock signal. When the first forwarding node receives the service message belonging to the relay protection service sent by the first power device, it obtains the timestamp from the local clock and adds it to the service message, and then forwards it to the second transmission tunnel on the first transmission tunnel. The forwarding node sends the service message. The second forwarding node receives the service message, obtains the timestamp from the local clock, and calculates the transmission time of the service message on the first transmission tunnel according to the obtained timestamp and the timestamp included in the service message. The second forwarding node calculates the time difference between the transmission time and the preset time threshold, and then buffers the service message, and when the buffering time of the service message reaches the time difference, sends the service message to the second power device. In this way, it is ensured that the transmission time of the service packet received by the second power device on the first transmission tunnel each time is equal to the preset time threshold. Similarly, for the service message sent by the second power device to the first power device, the transmission time of the service message on the second transmission tunnel is also stored in the above manner to be equal to the preset time threshold.

In the process of realizing this application, the inventor found that the related technology has at least the following problems:

The first forwarding node and the second forwarding node need to receive the clock signal of the same clock source to achieve time synchronization, but the clock source is vulnerable to attack, resulting in the clock signal sent to the first forwarding node and the clock signal sent to the second forwarding node The difference makes it impossible for the first forwarding node and the second forwarding node to achieve time synchronization. In this way, the transmission time of the service packet calculated by the second forwarding node is not accurate, and it is impossible to ensure that the service packet received by the power equipment is in the transmission tunnel each time. The value of the change in the transmission time does not exceed the preset threshold.

Summary of the invention

The embodiments of the present application provide a communication method, device, and system, which can improve the accuracy of calculating the transmission time of a service message, so as to ensure that the change in the transmission time of the service message received by the power equipment on the transmission tunnel does not exceed The threshold is preset, and the technical solution is as follows:

In the first aspect, the present application provides a communication method. In the method: a first forwarding node receives a first service packet, the first forwarding node is a node other than the end node that the transmission tunnel passes through, and the transmission tunnel is A tunnel used to transmit the first service message; the first forwarding node obtains the detention time of the first service message in the first forwarding node; the first forwarding node sends a second service message, and the second service message includes the detention time. Since the first forwarding node can accurately obtain the detention time, the detention time is added to the second service message, so that the end node of the transmission tunnel receives the second service message according to the The detention time added by each forwarding node can accurately obtain the transmission time of the second service message in the transmission tunnel, thereby improving the accuracy of calculating the transmission time of the service message to ensure that the power equipment receives the service message every time The change value of the transmission time on the transmission tunnel does not exceed the preset threshold.

In a possible implementation manner, the first forwarding node obtains the reception timestamp and the current timestamp of the first service message; according to the reception timestamp and the current timestamp, the first forwarding node obtains the information of the first service message in the first forwarding node. Detention time. Since both the receiving timestamp and the current timestamp are timestamps read from the local clock of the first forwarding node, the residence time can be accurately obtained based on the receiving timestamp and the current timestamp.

In another possible implementation manner, when receiving the first service packet, the first forwarding node saves the correspondence between the packet identification information of the first service packet and the reception timestamp of the first service packet; The first forwarding node obtains the reception timestamp of the first service message from the correspondence between the message identification information and the reception timestamp according to the message identification information of the first service message. In this way, when the first forwarding node determines to send the first service packet, the receiving time stamp of the first service packet can be obtained, so that the residence time of the first service packet can be accurately obtained based on the receiving time stamp.

In another possible implementation manner, when the first forwarding node receives the first service packet, it adds the reception timestamp of the first service packet to the first service packet; and extracts the received time stamp from the first service packet. Timestamp. Adding the receiving timestamp to the first service message, compared with the above-mentioned extracting the message identification information from the first service message and then saving the correspondence between the message identification information and the receiving timestamp, the implementation method is simplified, and it can reduce the number of errors. Occupation of storage space.

In another possible implementation manner, in the case where the first forwarding node is the non-head node of the transmission tunnel, the first service message includes the total detention time, and the total detention time is the time that the first service message has passed. The sum of the detention time in each forwarding node; the first forwarding node accumulates the total detention time included in the first service message and the detention time to obtain an accumulated value, and replaces the total detention time included in the first service message with the accumulated value Value to get the second service message. Since the second service message includes a total detention time, the amount of data carried in the second service message can be reduced.

In a second aspect, the present application provides a communication method, in the method: a second forwarding node receives a second service packet, and the second service packet includes each forwarding of the second service packet before the second forwarding node The detention time on the node, the second forwarding node is the end node of the transmission tunnel, the transmission tunnel is a tunnel used to transmit the second service packet, and each forwarding node before the second forwarding node passes through the transmission tunnel node. The second forwarding node obtains the allowable residence time of the second service packet in the second forwarding node according to the residence time and the time threshold of the second service packet in each forwarding node. The second forwarding node sends the second service message when the detention time of the second service message in the second forwarding node reaches the allowable detention time. Since the second service message includes the residence time of the second service message on each forwarding node before the second forwarding node, for any forwarding node, the forwarding node can accurately obtain the second service message on itself. Detention time, so that the second forwarding node can accurately obtain the allowable detention time of the second service message in the second forwarding node according to the detention time of each forwarding node, and the detention time of the second service message in the second forwarding node The second service message is sent when the allowable detention time is reached, so that it can be ensured that the change in the transmission time of the service message received by the power device each time on the transmission tunnel does not exceed the preset threshold.

In a possible implementation manner, the second forwarding node obtains the detention time of the second service packet in the second forwarding node, and the detention time of the second service packet in the second forwarding node refers to the detention time from the second forwarding node. When the forwarding node receives the second service message and buffers the second service message in the jitter buffer, the jitter buffer is a buffer in the second forwarding node. The second forwarding node obtains the time allowed for the second service packet to be buffered in the jitter buffer according to the residence time of the second service packet in each forwarding node, the residence time in the second forwarding node, and the time threshold. In this way, the second service message is sent when the storage time in the jitter buffer reaches the allowable buffer time, which can ensure that the change in the transmission time of the service message received by the power device each time on the transmission tunnel does not exceed the preset threshold.

In another possible implementation manner, the second forwarding node obtains the reception timestamp of the second service packet and obtains the first timestamp when the second service packet is buffered in the jitter buffer. The second forwarding node obtains the residence time of the second service packet in the second forwarding node according to the reception timestamp and the first timestamp. Since the reception time stamp and the first time stamp are both time stamps read from the local clock of the second forwarding node, the residence time can be accurately obtained based on the reception time stamp and the first time stamp.

In another possible implementation manner, when receiving the second service packet, the second forwarding node saves the correspondence between the packet identification information of the second service packet and the receiving timestamp of the second service packet. The second forwarding node obtains the reception timestamp of the second service message from the correspondence between the message identification information and the reception timestamp according to the message identification information of the second service message. In this way, the second forwarding node can obtain the reception timestamp of the second service message, so that the residence time of the second service message can be accurately obtained based on the reception timestamp.

In another possible implementation manner, when receiving the second service packet, the second forwarding node adds the receiving timestamp of the second service packet to the second service packet. The second forwarding node extracts the reception timestamp from the second service message. Adding the receiving timestamp to the second service message, compared with the above-mentioned extracting the message identification information from the second service message and then saving the correspondence between the message identification information and the receiving timestamp, the implementation method is simplified, and it can reduce the number of errors. Occupation of storage space.

In the third aspect, the present application provides a communication device for executing the first aspect or the method in any one of the possible implementation manners of the first aspect. Specifically, the device includes a unit for executing the method of the first aspect or any one of the possible implementation manners of the first aspect.

In a fourth aspect, the present application provides a communication device for executing the second aspect or the method in any one of the possible implementation manners of the second aspect. Specifically, the device includes a unit for executing the second aspect or any one of the possible implementation manners of the second aspect.

In a fifth aspect, an embodiment of the present application provides a communication device, the device including: a processor, a memory, and a transceiver. Wherein, the processor, the memory and the transceiver may be connected through a bus system. The memory is configured to store one or more programs, and the processor is configured to execute one or more programs in the memory to implement the first aspect or the method in any possible implementation manner of the first aspect.

In a sixth aspect, an embodiment of the present application provides a communication device, the device including: a processor, a memory, and a transceiver. Wherein, the processor, the memory and the transceiver may be connected through a bus system. The memory is configured to store one or more programs, and the processor is configured to execute one or more programs in the memory to implement the second aspect or the method in any possible implementation manner of the second aspect.

In a seventh aspect, the present application provides a computer-readable storage medium with a program stored in the computer-readable storage medium. When it runs on a computer, the computer executes the above-mentioned first, second, and first aspects. Any possible implementation manner or method in any possible implementation manner of the second aspect.

In an eighth aspect, this application provides a computer program product containing a program, which when it runs on a computer, enables the computer to execute the above-mentioned first aspect, second aspect, any possible implementation manner of the first aspect or the second aspect Any possible implementation method.

In a ninth aspect, the present application provides a communication system, the system comprising: the device described in the third aspect and the device described in the fourth aspect, or the device described in the fifth aspect and the device described in the sixth aspect Mentioned device.

Description of the drawings

FIG. 1 is a schematic diagram of a network architecture provided by an embodiment of the present application;

2 is a schematic diagram of the structure of a service message provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of another service message provided by an embodiment of the present application;

Figure 4 is a schematic structural diagram of a forwarding node provided by an embodiment of the present application;

FIG. 5 is a schematic diagram of another network architecture provided by an embodiment of the present application;

FIG. 6 is a flowchart of a communication method provided by an embodiment of the present application;

FIG. 7 is a schematic structural diagram of another service message provided by an embodiment of the present application;

FIG. 8 is a schematic structural diagram of another service message provided by an embodiment of the present application;

FIG. 9 is a schematic structural diagram of another service message provided by an embodiment of the present application;

FIG. 10 is a schematic structural diagram of another service message provided by an embodiment of the present application;

FIG. 11 is a schematic structural diagram of another service message provided by an embodiment of the present application;

FIG. 12 is a schematic structural diagram of another service message provided by an embodiment of the present application;

FIG. 13 is a schematic structural diagram of another service message provided by an embodiment of the present application;

FIG. 14 is a schematic structural diagram of a communication device provided by an embodiment of the present application;

FIG. 15 is a schematic structural diagram of another communication device provided by an embodiment of the present application;

FIG. 16 is a schematic structural diagram of another communication device provided by an embodiment of the present application.

Detailed ways

Referring to FIG. 1, an embodiment of the present application provides a communication architecture. The communication architecture includes multiple forwarding nodes 1 and multiple terminals 2. The communication network includes a plurality of forwarding nodes 1, and each terminal 2 can be connected to the forwarding node 1 of the communication network.

The terminal 2 can transmit service messages through the communication network. For example, for two terminals 2 that need to transmit services, the two terminals 2 are referred to as a first terminal and a second terminal for convenience of description, and the forwarding node connected to the first terminal is the first forwarding node, and the second terminal is connected to the second terminal. The forwarding node of is the second forwarding node. The first terminal can establish a network connection with the second terminal. The network connection includes the connection between the first terminal and the first forwarding node, the transmission tunnel between the first forwarding node and the second forwarding node, and the second Forward the connection between the node and the second terminal.

The transmission tunnel between the first forwarding node and the second forwarding node includes a first transmission tunnel and a second transmission tunnel. The head node of the first transmission tunnel is the first forwarding node, and the end node is the second forwarding node. The first transmission tunnel is used to transmit the service message sent by the first terminal to the second terminal. The first node of the second transmission tunnel is the second forwarding node, and the end node is the first forwarding node. The second transmission tunnel is used to transmit the service message sent by the second terminal to the first terminal.

The forwarding nodes passed by the first transmission tunnel and the forwarding nodes passed by the second transmission tunnel may be the same or different. For any one of the first transmission tunnel and the second transmission tunnel, the number of forwarding nodes passed by the transmission tunnel is greater than or equal to two. When the number of forwarding nodes is equal to 2, it means that the forwarding nodes that the transmission tunnel passes through include the first forwarding node and the second forwarding node. When the number of forwarding nodes is greater than 2, it means that in addition to the first forwarding node and the second forwarding node, the forwarding nodes that the transmission tunnel passes through may also include other forwarding nodes, and the other forwarding nodes are intermediate nodes that the transmission tunnel passes through. .

The network architecture shown in Figure 1 may be an Internet protocol/multi-protocol label switching (IP/MPLS) network architecture, under which the business report transmitted between the first terminal and the second terminal The message can be an MPLS message. Alternatively, the network architecture shown in Figure 1 may be a segment routing based on IPv6 (SRV6) network architecture, in which the service packets transmitted between the first terminal and the second terminal may be SRV6 packets Text.

Referring to Figure 2, in the IP/MPLS network architecture, the service message may be an MPLS message, including a message header, a payload part, and a frame check sequence (FCS). The payload part is located between the message header and FCS. The message header includes multiple fields. The multiple fields are the source and destination media access control address (destination and source medium access control address, InnerL2), virtual local area network number (virtual local area network TAG, VlanTAG), and Ethernet type identifier (thernet). type, E-type), internal pseudowire label value (inner pseudowire multi-protocol label switching ID, Inner PW), control word (CW), and realtime transport protocol (realtime transport protocol, RTP).

Next, an example of the length of each field in the MPLS packet is listed. Of course, the length of each field is not limited to this example, and may also be other lengths, which will not be listed here. In this example, the length of InnerL2 can be 12 bytes, the length of VlanTAG can be 4 bytes, the length of E-type can be 2 bytes, the length of InnerPW can be 4 bytes, and the length of CW It can be 4 bytes, and the length of RTP can be 12 bytes. The length of the payload part is not fixed, and the length of the payload part in different service messages can be different or the same. The length of FCS can be 4 bytes.

Referring to Figure 3, in the SRV6 network architecture, the service message can be an SRV6 message. The message header of the SRV6 message includes the following fields, which are the Next Header and the segment routing header length ( header extended length, HdrExtLen), routing type (RoutingType), number of remaining SRv6 ends (SegmentLeft), last segment entity sequence number (Last Entry), segment routing header identifier (Flags), SRv6 message The type identification (Tag) of the SRv6 message, the type identification (Segment List) of the SRv6 message, and the optional type length value (OTLV), etc. The Segment List includes n+1 128-bit IPv6 addresses (128 bits IPv6 address), and n is an integer greater than 0.

Optionally, the forwarding node 2 may be a router or a switch.

The second terminal may require that the change value of the first transmission time of the service packet sent by the first terminal each time on the first transmission tunnel is smaller than the change value threshold. The first terminal may also require that the change value of the second transmission time of the service packet sent by the second terminal each time on the second transmission tunnel is smaller than the change value threshold. The first terminal and the second terminal may also require that the first transmission time and the second transmission time are equal or the difference does not exceed the difference threshold.

For example, assuming that the communication architecture is an IP/MPLS network architecture, the communication architecture can be applied to the power industry. In the power industry, the first terminal and the second terminal may be power equipment. The service message transmitted between the first terminal and the second terminal may be a service message belonging to a relay protection service.

In the power industry, a first terminal sends a service message to a second terminal through a first transmission tunnel, and each time the second terminal receives a service message, it measures the first transmission time of the service message on the first transmission tunnel. Similarly, the second terminal sends a service message to the first terminal through the second transmission tunnel, and each time the first terminal receives a service message, it measures the second transmission time of the service message on the second transmission tunnel. The change value of the first transmission time measured each time at the second terminal is relatively large, or the change value of the second transmission time measured each time at the first terminal is relatively large, or the difference between the first transmission time and the second transmission time is If the difference between the two exceeds the difference threshold, it may lead to a power outage accident in the power grid. Therefore, in the electric power industry, the change value of the first transmission time and the change value of the second transmission time are required to be less than the change value threshold, and the difference between the first transmission time and the second transmission time is equal or the difference does not exceed the difference threshold. , The change threshold can be 200 microseconds, 180 microseconds, or 160 microseconds, etc., and the difference threshold can be 200 microseconds, 180 microseconds, or 160 microseconds, etc.

For any one of the first transmission tunnel and the second transmission tunnel, when a service packet is transmitted in the transmission tunnel, the forwarding node that the transmission tunnel passes through has a significant impact on the transmission time of the service packet on the transmission tunnel. Big impact. The length of time the business message stays in the forwarding node determines the length of the transmission time of the business message. When the network traffic is large, the forwarding node cannot forward the received business message in time, which causes the detention time of the business message in the forwarding node to become longer, and correspondingly causes the transmission time of the business message to also become longer. When the network traffic is small, the forwarding node can forward the business message in time, so that the residence time of the business message on the forwarding node is shortened, and accordingly the transmission time of the business message is also shortened accordingly.

In the communication network, the forwarding nodes are often connected by high-speed cables such as optical fiber. For the cable between any two forwarding nodes, the transmission speed of each service packet on the cable between the two forwarding nodes is the same. And the time required is very short. Therefore, for each cable that the transmission tunnel passes through, the sum of the time taken for different service packets to be transmitted on each cable that the transmission tunnel passes through is the same, but different service packets are transmitted on each forwarding node that the transmission tunnel passes through. The sum of residence time may be different. Therefore, the transmission time of the service message in the transmission tunnel is greatly affected by the forwarding node, and the length of the transmission time is mainly affected by the sum of the residence time of the service message on each forwarding node that the transmission tunnel passes through.

Since the detention time of the service packet on each forwarding node through the transmission tunnel has a great influence on the transmission time of the service packet on the transmission tunnel, it is necessary for each forwarding node except the end node that the transmission tunnel passes through. Nodes, each forwarding node can add the detention time of the service message to the service message when receiving the service, and then forward the service message with the detention time added. For the end node of the transmission tunnel, after receiving the service message, the end node obtains the total detention time according to the service message including the detention time of the service message on each forwarding node that has passed, and then according to the time threshold and the detention time Total time, obtain the allowable residence time of the service message in the end node, and send the service message to the terminal when the residence time of the service message in the end node reaches the allowable residence time. Wherein, the sum of the total detention time and the allowable detention time is equal to the time threshold, so that the terminal measures the transmission time of the service message on the transmission tunnel equal to the time threshold plus the time the service message passes through the transmission tunnel The sum of the time spent on each cable. The detailed implementation process of how the forwarding node adds the detention time to the service message and how the end node obtains the total detention time will be described in detail in the subsequent embodiment shown in FIG. 6, and will not be introduced here.

For the end node of the first transmission tunnel, that is, each time the second forwarding node receives a service message sent by the first terminal, it processes the received service message in the above manner before sending it to the second terminal, which can ensure Each time the second terminal receives a service message, the measured first transmission time is the same or the change value of the measured first transmission time is smaller than the change value threshold. Similarly, for the end node of the second transmission tunnel, that is, each time the first forwarding node receives a service message sent by the second terminal, it processes the received service message in the above manner before sending it to the first terminal. It can be ensured that the measured second transmission time is the same every time the first terminal receives a service message or the change value of the measured second transmission time is smaller than the change value threshold.

Optionally, the first forwarding node and the second forwarding node mutually agree on a time threshold when establishing the first transmission tunnel and the second transmission tunnel, so that the first forwarding node and the second forwarding node use the same time threshold, so that the first forwarding node and the second forwarding node can be guaranteed The difference between the first transmission time and the second transmission time does not exceed the difference threshold.

It should be noted that when the forwarding node passed by the first transmission tunnel and the forwarding node passed by the second transmission tunnel are different, the length of the cable passed by the first transmission tunnel and the length of the cable passed by the second transmission tunnel may be different at this time. In this way, the time taken for the service message to be transmitted on the cable of the first transmission tunnel is different from the time taken for the service message to be transmitted on the cable of the second transmission tunnel. If the difference between the two times exceeds the difference threshold, it may be necessary to re-establish the first transmission tunnel and the second transmission tunnel between the first forwarding node and the second forwarding node to make the difference between the two times The difference between the two does not exceed the difference threshold. In this way, it is possible to ensure as much as possible between the first transmission time used when the service message sent by the first terminal is transmitted on the first transmission tunnel and the second transmission time used when the service message sent by the second terminal is transmitted on the second transmission tunnel. The difference between the two does not exceed the difference threshold.

Referring to Fig. 4, an embodiment of the present application provides a forwarding node 1. The forwarding node 1 may be a forwarding node in the network architecture shown in Fig. 1, and includes:

The processor 21, the memory 22, the bus 23 and the communication interface 24. The processor 21, the memory 22 and the communication interface 24 are connected through a bus 23.

The forwarding node 1 includes a plurality of communication interfaces 24, and the forwarding node 1 communicates with other devices through the communication interface 24. For example, the forwarding node 1 may communicate with its neighbor forwarding nodes through the communication interface 24. When the forwarding node 1 is still in communication with the terminal, the forwarding node 1 communicates with the terminal through another communication interface 24.

Optionally, the communication interface 24 includes components such as a transceiver and a processing chip. The transceiver has a function of sending and receiving messages, and the processing chip has at least one function of processing messages. When the communication interface 24 is connected to the terminal, the communication interface 24 may also include a jitter buffer.

Optionally, the processing chip may be implemented by digital signal processing (digital signal processing, DSP) or field programmable logic gate array (field programmable gate array, FPGA), etc.

Optionally, when the forwarding node 1 is a forwarding node in the IP/MPLS network architecture, the communication interface 24 connecting the forwarding node 1 and the terminal may be a low-speed interface such as an E1 interface or a C37.94.

A forwarding table may be stored in the memory 22, and the forwarding table is used to store the corresponding relationship between the index information and the tunnel information. For the index information and tunnel information included in each record in the forwarding table, the index information may be the device identifier of the destination device or the label of the transmission tunnel. The tunnel information includes indication information and the interface identifier of the communication interface, and may also include the transmission tunnel. , The instruction information can be a pressure label instruction, an exchange instruction or a pop-up label instruction. The press label indication is used to instruct the processor 21 to add a label to the message, the exchange indication is used to instruct the processor 21 to replace the label in the message with the label in the tunnel information, and the pop label indication is used to instruct the processor 21 to remove the message. Tags in the text. When the processor 21 receives a message through a communication interface 24, the processor 21 queries the corresponding tunnel information from the forwarding table of the memory 22 according to the device identification or label of the destination device included in the message, and the tunnel information includes an indication Information and the interface identifier of the communication receiving port, the message is processed according to the instruction information, and the processed message is sent through the communication interface 24 corresponding to the interface identifier.

The forwarding node 1 may be the first forwarding node or the second forwarding node described above, or an intermediate node through which the first transmission tunnel or the second transmission tunnel passes. For example, referring to FIG. 5, for the first transmission tunnel, the first transmission tunnel is used to transmit the service message sent by the first terminal to the second terminal. The first node of the first transmission tunnel is the first forwarding node 11. The first forwarding node 11 communicates with the first terminal through a communication interface 241, and communicates with the downstream of the first forwarding node 11 through another communication interface 242 on the first transmission tunnel. For forwarding node communication, there is a record including index information and tunnel information in the forwarding table of the first forwarding node 11. The index information in the record includes the device identifier D2 of the second terminal, and the tunnel information in the record includes information related to the downstream The interface identifier U242, the pressure label indication, and the label 1 of the communication interface 242 of the forwarding node communication.

For any intermediate node that the first transmission tunnel passes through, the intermediate node is called the third forwarding node 13. On the first transmission tunnel, the third forwarding node 13 communicates with the upstream forwarding node of the third forwarding node 13 through a communication interface 243 Connected to the downstream forwarding node of the third forwarding node 13 through another communication interface 244. There is a record including index information and tunnel information in the forwarding table of the third forwarding node 13. The index information in the record includes tag 1, and the tunnel information in the record includes the interface identifier U244, the interface identifier of the communication interface with the downstream forwarding node, Exchange instructions and labels 2.

The end node that the first transmission tunnel passes through is the second forwarding node 12. On the first transmission tunnel, the second forwarding node 12 is connected to the upstream forwarding node of the second forwarding node 12 through a communication interface 245, and through another communication interface 246 Connect with the second terminal. There is a record including index information and tunnel information in the forwarding table of the second forwarding node 12. The index information in the record includes tag 2, and the tunnel information in the record includes the interface identifier of the communication interface 246 connected to the second terminal. U246 and bullet label instructions.

Still referring to FIG. 5, for the second transmission tunnel, the second transmission tunnel is used to transmit the service message sent by the second terminal to the first terminal. Assuming that the forwarding node passed by the second transmission tunnel is the same as the forwarding node passed by the first transmission tunnel, the second forwarding node 12 is connected to the second terminal through the communication interface 246, and communicates with the second forwarding node through the communication interface 245 on the second transmission tunnel. The downstream forwarding node of the node 12 is connected, and there is a record including index information and tunnel information in the forwarding table of the second forwarding node 12. The index information in the record includes the device identifier D1 of the first terminal, and the tunnel information in the record It includes the interface identifier U245 of the communication interface 245 connected to the downstream forwarding node, the label 3, and the label indication.

For any intermediate node that the second transmission tunnel passes through, for example, for the third forwarding node 13, on the second transmission tunnel, the third forwarding node 13 is connected to the upstream forwarding node of the third forwarding node 13 through the communication interface 244, and through communication The interface 243 is connected to the downstream forwarding node of the third forwarding node 13. There is a record including index information and tunnel information in the forwarding table of the third forwarding node 13. The index information in the record is label 3, and the tunnel information in the record includes the interface identifier of the communication interface connected to the downstream forwarding node. U243, exchange instructions and labels 4.

The end node that the second transmission tunnel passes through is the first forwarding node 11. On the second transmission tunnel, the second forwarding node 12 is connected to the upstream forwarding node of the first forwarding node 11 through the communication interface 242, and is connected to the first terminal through the communication interface 241 Connected. There is a record including index information and tunnel information in the forwarding table of the first forwarding node 11. The index information in the record includes tag 4, and the tunnel information in the record includes the interface identifier of the communication interface 241 connected to the first terminal. U241 and bullet label instructions.

Optionally, the memory 22 may also store at least one application code, and the processor 21 in the forwarding node 1 and/or the processing chip in the communication interface 24 may call and run the application code from the memory 22 to achieve the following The function includes adding the detention time of the service message in the forwarding node 1 to the service message received by the forwarding node 1 or obtaining the allowable detention time of the service message on the forwarding node 1 and so on. The specific process for the forwarding node 1 to implement these functions will be described in detail in the subsequent embodiment shown in FIG. 6, and will not be described in detail here.

Optionally, the aforementioned processor 21 may be a general-purpose central processing unit (central processing unit, CPU), network processor (network processor, NP), microprocessor, application-specific integrated circuit (ASIC), Or one or more integrated circuits used to control the execution of the program of this application. The processor may also refer to one or more devices, circuits, and/or processing cores for processing data (for example, computer program instructions).

The above-mentioned bus 23 may be a channel for transferring information between the above-mentioned components.

The aforementioned memory 22 may be random access memory (RAM) or other types of dynamic storage devices that can store information and instructions, disk storage media or other magnetic storage devices, or can be used to carry or store instructions or data. The desired program code in the structural form and any other medium that can be accessed by the computer, but not limited to this. The memory can exist independently and is connected to the processor through a bus. The memory can also be integrated with the processor.

Referring to FIG. 6, an embodiment of the present application provides a communication method, which can be applied to the network architecture shown in FIG. 1 or FIG. 5. In this method, a process in which the first terminal sends a service message to the second terminal over the first transmission tunnel is taken as an example for description, and the method includes:

Step 301: The first forwarding node receives the first service packet sent by the first terminal, and the first forwarding node is the first node through which the first transmission tunnel passes.

Optionally, referring to FIG. 5, a network connection is established between the first terminal and the second terminal, and the network connection includes the connection between the first terminal and the first forwarding node, and the connection between the first forwarding node and the second forwarding node. The connection between the first transmission tunnel and the second transmission tunnel, and the second forwarding node and the second terminal.

The first terminal may send the first service message to the second terminal on the network connection. Since the first forwarding node is connected to the first terminal through a communication interface, the communication interface of the first forwarding node receives the first service packet. For ease of description, the communication interface is called the first communication interface.

Optionally, the first service message includes a destination device address field, and the destination device address field carries the device identifier of the second terminal. When the first service message is an MPLS message, the destination device address field may be located in the Inner L2 field of the MPLS message. When the first service message is an SRV6 message, the destination device address field may be the Segment list field of the SRV6 message, and the device identifier of the second terminal may be the last IPV6 address in the Segment list field.

Optionally, when receiving the first service packet, the first forwarding node acquires the reception timestamp of the first service packet. For ease of description, the receiving timestamp is referred to as the first receiving timestamp, and the first receiving timestamp is added to the first service message. Alternatively, the message identification information of the first service message is obtained from the first service message, and the message identification information and the first reception timestamp are correspondingly stored in the correspondence relationship between the message identification information and the reception timestamp. The message identification information includes the source device identification, source port number, destination device identification, destination port number, and message sequence number of the first service message of the first service message.

Optionally, the first forwarding node includes a local clock, and when receiving the first service message of the first terminal, the first forwarding node obtains the first reception timestamp from the local clock, and adds the first time stamp to the first service message. Receive timestamp.

Optionally, the first receiving timestamp obtained from the local clock may be a numerical value. In this case, the local clock can be a counter used for timekeeping, the time stamp can be a numerical value, and the value counted by the counter is a time stamp. For example, suppose the counter counts once every millisecond, and the current counter count value is 5, which means that the current time stamp is the 5th millisecond. or,

Optionally, the first receiving timestamp obtained from the local clock may also be data in a time format. For example, suppose that when the first service message is received, the first receiving timestamp obtained from the local clock is 2019-8-15-11-2-15-35, and the first receiving timestamp is data in time format.

Optionally, the first communication interface may include components such as a transceiver and a processing chip, and the foregoing operations such as obtaining the first receiving timestamp may be performed by the processing chip. That is, when the transceiver in the first communication interface receives the first service message sent by the first terminal, the processing chip obtains the first reception timestamp from the local clock of the first forwarding node, and adds the first reception timestamp to In the first service message; or, obtain the message identification information of the first service message from the first business message, and store the message identification information and the first reception timestamp correspondingly in the message identification information and the reception time Correspondence between stamps.

For the method of adding the first reception timestamp to the first service message, since there is no need to save the correspondence between the message identification information and the first reception timestamp, the storage resources occupied by the first forwarding node are reduced.

Optionally, the first reception timestamp may be added to the first field of the first service message. The first field may be a newly added field in the first service message or an existing field in the header of the first service message.

Optionally, the first service message may be an MPLS message, and when the first reception timestamp is acquired, the first field including the first reception timestamp may be added to the header of the first service message.

When the first service message is an MPLS message, the communication method can be applied to the IP/MPLS network architecture. In the IP/MPLS network architecture, the first terminal and the second terminal may be power equipment, and the first service message may be a message belonging to a relay protection service.

For example, referring to FIG. 7, when the first receiving timestamp is acquired, assuming that the first receiving timestamp is t1, the first field including the first receiving timestamp t1 is added to the header of the first service message. As shown in Figure 7, the first field may be located between InnerPW and CW.

Optionally, the length of the first field may be x bytes, and the value of x may be 4, 5, 6, 7, or 8 values.

Optionally, when the first service message is an SRv6 message, the first field may be a part of the OTLV of the first service message. When the first time stamp is obtained, the content of the first field of the first service message is set as the first time stamp.

For example, referring to FIG. 8, when the first reception timestamp t1 is obtained, some bits in the OTLV in the header of the first service message are selected as the first field, and the content of the first field is set as the first field. Receive timestamp t1.

After adding the first reception timestamp to the first service packet, the processing chip in the first communication interface may send the first service packet to the processor of the first forwarding node.

Optionally, referring to FIG. 7, before the processing chip of the first communication interface sends the first service message to the processor of the first forwarding node, it may also add a 1588 indication field and a 1588 indication field to the header of the first service message. 1588 mode field. Then send the first service message to the processor of the first forwarding node.

In this application, the first transfer node can use the technology defined in the transparent clock (TC) mode of the 1588 technology to obtain the detention time of the first service packet on the first forwarding node, so the 1588 instruction added by the processing chip The field includes the 1588 indication, and the added 1588 mode field includes the TC mode to trigger the processor of the first forwarding node to use the technology defined in the TC mode of the 1588 technology to perform operations. When using the TC mode of the 1588 technology, the local clock of the first forwarding node is a counter, and the first receiving timestamp t1 is a value.

Of course, the first forwarding node may also use other methods to obtain the detention time of the first service packet in the first forwarding node. When other methods are used, the processing chip of the first communication interface may not be used for the first service packet. The 1588 indication field and 1588 mode field are added to the header of the message.

Referring to Figure 5, the first forwarding node saves a forwarding table. After receiving the first service message, the processor of the first forwarding node, according to the device identification of the second terminal included in the first service message, assumes that the second terminal’s The device identification is D2, and the interface identification U242, label 1, and label pressing indication corresponding to the device identification ID2 of the second terminal are queried from the forwarding table stored by the first forwarding node. The processor of the first forwarding node adds label 1 to the first message, and sends the first service message to the communication interface corresponding to the interface identifier U242. For ease of description, the communication interface corresponding to the interface identifier U242 is referred to as the second communication interface.

Optionally, referring to FIG. 7, in the case where the 1588 indication field and the 1588 mode field are included in the first service packet, the processor of the first forwarding node sends the first service packet to the second communication interface in the 1588 Under the trigger of the 1588 indication in the indication field and the TC mode in the 1588 mode field, the first reception timestamp t1 is extracted from the first field of the first service message. The first reception timestamp t1 is a value, and the value is calculated as 0 The difference between t1 and t1 is 0-t1, the difference is a negative value, and the content of the second field of the first service message is set to the difference 0-t1.

Optionally, in the case that the first service packet is an MPLS packet, referring to FIG. 7, the processor of the first forwarding node may extend the length of the first field in the first service packet to obtain a second field of length y. Field, y is an integer value greater than x. For example, x=4, y=6; or, x=6, y=8, etc., replace the content included in the second field with the difference 0-t1.

Optionally, when the first service message is an SRv6 message, the second field of the first service message is a part of the OLTV other than the first field, and the processor of the first forwarding node converts the content of the second field Set the difference to 0-t1.

Optionally, referring to FIG. 7, the processor of the first forwarding node deletes the 1588 indication field and the 1588 mode field from the first service packet before sending the first service packet to the second communication interface.

Optionally, in the case that the first service packet is an MPLS packet, referring to FIG. 7, the processor of the first forwarding node may also send the first service packet to the second communication interface before sending the first service packet to the second communication interface. A field is added to the header of the message, and the field is label switch path (LSP).

Step 302: The first forwarding node obtains the residence time of the first service packet in the first forwarding node, and adds the residence time to the first service packet to obtain the second service packet.

When the second communication interface of the first forwarding node receives the first service packet, the first forwarding node starts to perform the operation of this step. The second communication interface includes a processing chip and a transceiver, that is, the processing chip can perform the operation of this step, and the execution process is as follows:

In this step, the first receiving timestamp and the current timestamp of the first service message can be obtained. For the convenience of explanation, the current timestamp is called the second timestamp, and the first receiving timestamp and the second timestamp are obtained according to the first receiving timestamp and the second timestamp. The detention time of a service message in the first forwarding node is added to the first service message to obtain the second service message.

Optionally, the second time stamp can be read from the local clock. Since the first field of the first service message includes the first reception timestamp, the first reception timestamp can be directly extracted from the first field of the first service message. Or, extract the message identification information of the first service message from the first service message, and obtain the first reception timestamp from the correspondence between the message identification information and the reception timestamp.

In addition, since both the first receiving timestamp and the second timestamp are obtained from the local clock of the first forwarding node, the accuracy of the residence time at the first forwarding node obtained based on the first receiving timestamp and the second timestamp Very high.

In the case where the first receiving timestamp is obtained from the correspondence between the message identification information and the receiving timestamp, it may also be deleted from the correspondence between the message identification information and the receiving timestamp after the first receiving timestamp is obtained. The record includes the message identification information of the first service message and the first reception timestamp.

Optionally, the residence time can be added to the second field of the first service message. The second field can be a field obtained by extending the first field of the header of the first service message, or the second field The field may be an existing field in the header of the first service message.

Optionally, when the first service packet is an MPLS packet, after obtaining the residence time of the first service packet in the first forwarding node, the length of the first field in the first service packet may be expanded to obtain In the second field, replace the content in the second field with the residence time.

For example, referring to Figure 7, the processing chip of the second communication interface of the second forwarding node reads the current timestamp t2 from the local clock, that is, the second timestamp is t2, and extracts the first field from the first field of the first service packet. Receive timestamp t1, obtain the residence time t2-t1 of the first service packet in the first forwarding node according to the first received timestamp t1 and the second timestamp t2, and extend the length of the first field in the first service packet Obtain the second field, and replace the content in the second field with the residence time t2-t1.

Optionally, when the first service message is an SRV6 message, referring to FIG. 9, the second field may be a part of the OTLV field of the first service message except the first field. After obtaining the residence time t2-t1 of the first service packet in the first forwarding node, the OTLV field of the first service packet except the first field is used as the second field, and the content of the second field Set the residence time t2-t1.

Optionally, when the first forwarding node adopts the TC mode of 1588 technology, the first field in the first service packet received by the processing chip of the second communication interface has been extended to the second field, and the second field The content of the field is a negative value 0-t1. In this step, the second time stamp t2 obtained from the local clock is the value t2 counted by the local clock. The negative value 0-t1 can be extracted from the second field of the first service message, and the negative value 0-t1 Accumulate with the value t2 to obtain an accumulated value t2-t1, use the accumulated value t2-t1 as the residence time of the first service packet in the first forwarding node, and replace the content in the second field with the residence time t2-t1.

Step 303: The first forwarding node sends a second service message with the retention time added.

In this step, the transceiver in the second communication interface of the first forwarding node sends the second service message with the residence time added.

After the first forwarding node sends the second service packet, the intermediate node that the first transmission tunnel passes through receives and forwards the second service packet. For ease of description, the intermediate node is referred to as the third forwarding node. The third forwarding node can perform the following operations.

Step 304: The third forwarding node receives the second service message, where the second service message includes the residence time of the second service message in each forwarding node that has passed.

Optionally, the second field of the second service message may include the detention time of the second service message in each forwarding node that has passed, or the second field of the second service message may include the total detention time , The total detention time is the sum of the detention time of the second service message in each forwarding node that has passed.

In this step, the third forwarding node receives the second service packet through a communication interface. For ease of description, the communication interface is referred to as the third communication interface.

In this step, when the third forwarding node receives the second service packet, it can obtain the receiving timestamp of the second service packet from the local clock. For the convenience of description, the received timestamp is called the second receiving timestamp. , Add the second receiving timestamp to the second service message. Alternatively, the message identification information of the second service message is obtained from the second service message, and the message identification information and the first reception timestamp are correspondingly stored in the correspondence between the message identification information and the reception timestamp.

The third communication interface includes components such as a processing chip, and the processing chip can perform operations such as obtaining the second receiving timestamp.

The second reception timestamp may be data in numerical form or may be data in time format.

Optionally, a second receiving timestamp may be added to the first field of the second service message. The first field may be a newly added field in the second service message or an existing field in the message header of the second service message.

Optionally, the second service message may be an MPLS message, and when the second reception timestamp is obtained, the first field including the second reception timestamp may be added to the second service message.

For example, referring to FIG. 10, when the third communication interface of the third forwarding node receives the second service packet, the processing chip in the third communication interface obtains the second reception timestamp t3 from the local clock of the third forwarding node, and The first field including the second receiving timestamp t3 is added to the second service message. As shown in Figure 10, the first field may be located between the payload part and the FCS.

Optionally, the second service message may be an SRV6 message. Referring to FIG. 11, after the third communication interface of the third forwarding node obtains the second reception timestamp t3, it transfers the first OTLV of the second service message to The content of the field is replaced with the second receiving timestamp t3.

After the processing chip in the third communication interface adds the second reception timestamp to the second service packet, it may send the second service packet to the processor of the third forwarding node.

Optionally, referring to FIG. 10, before the processing chip of the third communication interface sends the second service packet to the processor of the third forwarding node, it may also add a 1588 indication field and a 1588 indication field to the header of the second service packet. 1588 mode field.

Referring to Figure 5, the third forwarding node stores a forwarding table, and the processor of the third forwarding node queries the forwarding table stored by the third forwarding node according to the label 1 included in the second service message to find out the forwarding table corresponding to label 1. Interface identification U244, exchange instructions and label 2. In order to facilitate the description, the communication interface corresponding to the interface identifier U244 is referred to as the fourth communication interface. The processor of the third forwarding node replaces the label 1 in the second service packet with the label 2, and identifies the fourth communication corresponding to U244 to the interface. The interface sends the second service packet.

Optionally, referring to FIG. 10, when the second service packet includes the 1588 indication field and the 1588 mode field, the processor of the third forwarding node sends the second service packet to the fourth communication interface before sending the second service packet to the fourth communication interface. Under the trigger of the 1588 indication in the indication field and the TC mode in the 1588 mode field, the second receiving timestamp t3 is extracted from the first field of the second service message and the total detention time is extracted from the second field, assuming that The total detention time is TS1. Wherein, the total detention time TS1 and the second receiving time stamp t3 are both in numerical form, that is to say, the total detention time TS1 and the second receiving time stamp t3 are two numerical values. Calculate the difference between the value TS1 and the value t3, the difference is equal to TS1-t3, replace the content in the second field in the second service packet with the difference TS1-t3, and then delete the second service packet The 1588 indication field and the 1588 mode field are sent, and then the second service packet is sent to the fourth communication interface. When the second service message is an MPLS message, after the processor of the third forwarding node extracts the second reception timestamp t3 from the first field of the second service message, it may also delete the second service message from the second service message. One field.

Step 305: The third forwarding node obtains the residence time of the second service packet in the third forwarding node, and adds the residence time to the second service packet.

When the fourth communication interface of the third forwarding node receives the second service packet, the third forwarding node executes the operation of this step. The fourth communication interface includes components such as a processing chip, and the processing chip can perform the operation of this step. The execution process is as follows:

When the fourth communication interface receives the second service message, the second reception timestamp and the current timestamp of the second service message can be obtained. For the convenience of explanation, the current timestamp acquired at this time is called the third timestamp. The second reception timestamp and the third timestamp acquire the residence time of the second service message in the third forwarding node, and add the residence time to the second service message.

In this step, the third time stamp can be read from the local clock of the third forwarding node. Since the first field of the second service message includes the second reception timestamp, the second reception timestamp is directly extracted from the first field of the second service message. Alternatively, the message identification information of the second service message is extracted from the second service message, and the second reception timestamp is obtained from the correspondence between the message identification information and the reception timestamp.

In this step, the detention time can be added to the second service message in the following two ways. The two methods are:

Manner 1: The second field of the second service packet includes the residence time of the second service packet on each forwarding node that it passes. In this step, the residence time of the second service packet in the third forwarding node is directly Is added to the second field of the second service message.

Manner 2: The second field of the second service message includes the total detention time. In this step, the total detention time is extracted from the second field of the second service message, and the total detention time is compared with that of the second service message. The detention time detained in the third forwarding node is accumulated to obtain an accumulated value, and the total detention time included in the second field of the second service message is replaced with the accumulated value.

In mode two, the second field of the second service message includes the total detention time. Compared with the implementation mode of mode 1, the amount of data included in the second field is smaller, so that the length of the second field can be reduced to reduce Occupation of network resources.

Optionally, after obtaining the second reception timestamp from the correspondence between the message identification information and the reception timestamp, the message including the second service message may be deleted from the correspondence between the message identification information and the reception timestamp. Document identification information and a record of the second receiving timestamp.

Optionally, when the second service packet is an MPLS packet, after the second receiving timestamp is extracted from the first field of the second service packet, the first field may be deleted, so that the second field can be reduced. The size of business packets to reduce the occupation of network resources.

Optionally, referring to FIG. 10, when the third forwarding node adopts the TC mode of 1588 technology, the processor of the third forwarding node sends the second service packet to the fourth communication interface before sending the second service packet to the fourth communication interface. The content included in the second field of the message is replaced with the difference TS1-t3. In this step, the third time stamp t4 obtained is a value, and the difference TS1 is read from the second field of the second service message. -t3, accumulate the difference TS1-t3 and the value t4 to obtain the accumulated value TS1+t4-t3, and replace the content in the second field of the second service packet with the accumulated value.

Step 306: The third forwarding node sends the second service message with the residence time added.

In this step, the fourth communication interface of the third forwarding node sends the second service message with the detention time added.

After receiving the second service packet, each of the other intermediate nodes passing through the first transmission tunnel performs the same operation as the third forwarding node to send the second service packet, and the second service packet will be sent to the first transmission tunnel. The end node of a transmission tunnel is sent to the second transmission node.

Step 307: The second forwarding node receives the second service packet, where the second service packet includes the residence time of the second service packet in each forwarding node other than the second forwarding node that the first transmission tunnel passes through.

Optionally, the second field of the second service message may include the detention time of the second service message in the other forwarding nodes, or the second field of the second service message may include the total detention time, The total detention time is the sum of the detention time of the second service message in the other forwarding nodes.

In this step, the second forwarding node receives the second service packet through a communication interface. For the convenience of description, the communication interface is called the fifth communication interface.

The second forwarding node obtains the reception timestamp of the second service message when receiving the second service message. For the convenience of description, the received timestamp acquired at this time is called the third reception timestamp, and the third reception timestamp is added to In the second business message. Alternatively, the message identification information of the second service message is obtained from the second service message, and the message identification information and the third reception timestamp are correspondingly stored in the correspondence relationship between the message identification identification and the reception timestamp.

The fifth communication interface includes components such as a processing chip, and the processing chip can perform operations such as obtaining the third receiving timestamp. The execution process is as follows:

When the second service message is received, the current timestamp is obtained from the local clock included in the second forwarding node as the third reception timestamp, and the third reception timestamp is added to the second service message, or the second service message is The message identification information of the message and the third receiving timestamp are correspondingly stored in the correspondence between the message identification identifier and the receiving timestamp.

Optionally, the local clock of the second forwarding node may be a counter for timing, so the third receiving timestamp may be a numerical value. Alternatively, the third receiving timestamp may also be data in a time format.

In this step, a third receiving timestamp may be added to the first field of the second service message. The first field may be a newly added field in the second service message or an existing field in the message header of the second service message.

Optionally, the second service message may be an MPLS message. Referring to Figure 12, the current third reception timestamp t5 is obtained when the second service message is received, and added to the header of the second service message The first field including the third reception timestamp t5. As shown in Figure 12, the first field may be located between the payload part and the FCS.

Optionally, the second service message may be an SRV6 message. For example, referring to FIG. 13, the third reception timestamp t5 is acquired when the second service message is received, and the content included in the first field in the OTLV of the second service message is replaced with the third reception timestamp t5.

After the processing chip of the fifth communication interface adds the third reception timestamp to the second service message or saves the correspondence between the message identification information of the second service message and the third reception timestamp, it can send the message to the second forwarding node The processor sends the second service message.

Optionally, in the case that the second service packet is an MPLS packet, the processing chip of the fifth communication interface also deletes the second service packet in the second service packet before sending the second service packet to the processor of the second forwarding node LSP field.

Optionally, referring to FIG. 12, before the processing chip of the fifth communication interface sends the second service packet to the processor of the second forwarding node, it may also add a 1588 indication field and a 1588 indication field to the header of the second service packet. 1588 mode field.

Referring to FIG. 5, the second forwarding node stores a forwarding table, and the processor of the second forwarding node queries the forwarding table stored by the second forwarding node according to the device identifier D2 of the second terminal included in the second service packet. The interface identifier U246 corresponding to the device identifier ID2 of the second terminal. For the convenience of description, the communication interface corresponding to the interface identifier U246 is referred to as the sixth communication interface, and the processor of the second forwarding node sends the second service packet to the sixth communication interface corresponding to the interface identifier U246.

Optionally, referring to FIG. 12, when the second service packet includes the 1588 indication field and the 1588 mode field, the processor of the second forwarding node sends the second service packet to the sixth communication interface in the 1588 Under the trigger of the 1588 indication in the indication field and the TC mode in the 1588 mode field, the third time stamp t5 is extracted from the first field of the second service message and the total detention time is extracted from the second field, assuming the detention The total time is TS2. Wherein, the total detention time TS2 and the third receiving time stamp t5 are both in numerical form, that is to say, the total detention time TS2 and the third receiving time stamp t5 are two numerical values. Calculate the difference between the value TS2 and the value t5, the difference is equal to TS2-t5, replace the content in the second field in the second service packet with the difference TS2-t5, and then send it to the sixth communication interface Send the second service message. When the second service message is an MPLS message, after the processor of the second forwarding node extracts the third reception timestamp t5 from the first field of the service message, it may also delete the first service message from the second service message. Field.

Step 308: The second forwarding node buffers the second service message in the jitter buffer, and obtains the second service message in the jitter buffer according to the detention time and time threshold of the second service message included in the other forwarding nodes. The allowable residence time in the device.

The sixth communication interface of the second forwarding node includes a processing chip, a transceiver, a jitter buffer, and so on. When the processing chip of the sixth communication interface receives the service message, the processing chip of the sixth communication interface buffers the second service message in the jitter buffer. The operation of this step can be executed by the processing chip in the sixth communication interface. The execution process is as follows:

This step can be implemented by the following operations from 3081 to 3082. The operations from 3081 to 3082 are as follows:

3081: Acquire the retention time of the second service packet in the second forwarding node when the second service packet is buffered in the jitter buffer.

In this step, the third receiving timestamp and the current timestamp of the received second service message are acquired. For the convenience of description, the current timestamp acquired at this time is referred to as the first timestamp. According to the third receiving timestamp and the first time Stamp to obtain the residence time of the second service message in the second forwarding node.

When buffering the service message in the jitter buffer, the first time stamp can be read from the local clock of the second forwarding node. Since the first field of the second service message includes the third reception timestamp, the third reception timestamp can be directly extracted from the first field of the second service message. Or, obtain the message identification information of the second service message from the second service message, and obtain the third reception timestamp from the correspondence between the message identification information and the reception timestamp.

Optionally, the third receiving timestamp is obtained from the correspondence between the message identification information and the receiving timestamp, and the message identifier including the second service message is also deleted from the correspondence between the message identification information and the receiving timestamp Record of information and third reception timestamp.

Optionally, when the second service packet is an MPLS packet, after extracting the third reception timestamp from the first field of the second service packet, the first field may be deleted from the second service packet.

3082: Acquire the buffering time allowed for the service packet in the jitter buffer according to the residence time in the other forwarding nodes, the residence time in the second forwarding node, and the time threshold included in the second service packet.

Optionally, in the case where the second field of the second service message includes the retention time of the second service message in other forwarding nodes, extract all the retention time from the second field of the second service message, Accumulate all the extracted detention time and the detention time of the second service message in the second forwarding node to obtain the accumulated value, calculate the difference between the time threshold and the accumulated value, and determine the difference as allowing the second The buffering time of service packets in the jitter buffer. or,

Optionally, when the total detention time is included in the second field of the second service message, the total detention time is extracted from the second field of the second service message, and the total detention time and the second service report are The retention time of the message in the second forwarding node is accumulated to obtain the accumulated value, and the difference between the time threshold and the accumulated value is calculated, and the difference is determined as the time allowed for the second service message to be buffered in the jitter buffer .

Optionally, in the second service message MPLS message, after extracting all the detention time or total detention time from the second field in the second service message, the second service message can also be deleted from the second service message. Two fields.

Optionally, referring to FIG. 12, when the second forwarding node adopts the TC mode of the 1588 technology, the processor of the second forwarding node sends the second service packet to the sixth communication interface before sending the second service packet to the sixth communication interface. The content of the second field of the text is replaced with the difference TS2-t5. Then in this step, the first time stamp obtained from the local clock is a numerical value. Assuming that the first time stamp is t6, the difference TS2-t5 is read from the second field of the second service packet, and the difference is TS2-t5 is accumulated with the value t6, and the accumulated value is TS2+t6-t5.

Step 309: When the buffering time of the second service packet in the jitter buffer reaches the allowable buffering time, the second forwarding node deletes the detention time in the second service packet to obtain the first service packet, and sends the first service packet Text.

In this step, when the processing chip in the sixth communication interface of the second forwarding node detects that the buffering time of the second service packet in the jitter buffer reaches the allowable buffer time, it sends the data to the receiver through the transceiver in the sixth communication interface. The second terminal sends the second service message.

The second terminal may also send a service message to the first terminal. The transmission process of the service message sent by the second terminal on the second transmission tunnel is the same as the transmission process of the service message sent by the first terminal on the first transmission tunnel. , I won’t explain it in detail here.

In the embodiment of the present application, the first forwarding node located at the head node of the first transmission tunnel obtains the first reception timestamp for receiving the first service packet when receiving the first service packet, and the When arriving at the second communication interface of the first forwarding node, the current second timestamp is obtained, and the residence time of the first service packet in the first forwarding node is obtained according to the first receiving timestamp and the second timestamp. Since both the first receiving timestamp and the second timestamp are obtained based on the local clock of the first forwarding node and will not be affected by the attack, the detention time can be accurately obtained, which may add the detention time to the first A second service message is obtained from a service message, and then the second service message is sent. The third forwarding node located at the intermediate node of the first transmission tunnel obtains the second receiving timestamp of receiving the second service packet when receiving the second packet service, and the second receiving timestamp when the second service packet reaches the third forwarding node In the fourth communication interface, the current third time stamp is acquired, and the residence time of the second service packet in the third forwarding node is acquired according to the second receiving time stamp and the third time stamp. Since the second receiving timestamp and the third timestamp are both obtained based on the local clock of the third forwarding node, and will not be affected by the attack, the detention time can be accurately obtained, which may add the detention time to In the second service message, the second service message is sent again. In this way, when the second forwarding node located at the end node of the first transmission tunnel receives the second service packet, the second service packet includes the detention time of the second service packet on each forwarding node that has passed, thereby Based on the service message, the total detention time can be obtained, and the total detention time is equal to the sum of the detention time of the second service message on each forwarding node that has passed, and the second service is obtained according to the total detention time and the time threshold. The allowable detention time of the message on the second forwarding node, and the second service message is sent to the second terminal when the detention time of the second service message on the second forwarding node reaches the allowable detention time. Wherein, the time threshold is equal to the sum of the total detention time and the allowable detention time, so that after the second terminal receives the second service packet, the measured first transmission time of the second service packet on the first transmission tunnel It is equal to the time threshold plus the transmission time of the second service packet on the cable passing through the first transmission tunnel. Since the transmission time of different service packets on the cable passing through the first transmission tunnel is basically unchanged, when the second terminal receives different service packets, it is ensured that the different service packets measured by the second terminal are in the first transmission tunnel. The change value of the first transmission time above does not exceed the change value threshold. Since the time threshold is agreed upon by the first forwarding node and the second forwarding node, and the first forwarding node and the second forwarding node use the same time threshold, it is ensured that the service packet measured by the second terminal is on the first transmission tunnel. The difference between a transmission time and the second transmission time of the service packet measured by the first terminal on the second transmission tunnel does not exceed the difference threshold.

Referring to FIG. 14, an embodiment of the present application provides a communication device 400. The device 400 may be deployed in the foregoing first forwarding node and includes:

The receiving unit 401 is configured to receive a first service packet, the device 400 is a node other than the end node that the transmission tunnel passes through, and the transmission tunnel is a tunnel for transmitting the first service packet;

The processing unit 402 is configured to obtain the residence time of the first service packet in the first forwarding node;

The sending unit 403 is configured to send a second service message, where the second service message includes the detention time.

Optionally, for the detailed implementation process of the processing unit 402 acquiring the residence time, reference may be made to related content in step 302 and step 305 of the embodiment shown in FIG. 6.

Optionally, the processing unit 402 is configured to:

Acquiring the reception timestamp and current timestamp of the first service message;

Obtain the residence time of the first service packet in the first forwarding node according to the receiving timestamp and the current timestamp.

Optionally, for the detailed implementation process of the processing unit 402 acquiring the receiving time stamp and the current time stamp, reference may be made to related content in step 302 and step 305 in the embodiment shown in FIG. 6.

Optionally, the processing unit 402 is configured to add the receiving time stamp of the first service packet to the first service packet when the receiving unit 401 receives the first service packet; and extract the receiving time from the first service packet stamp.

Optionally, the processing unit is configured to store the correspondence between the message identification information of the first service message and the reception timestamp of the first service message when the receiving unit 401 receives the first service message; The message identification information of a service message obtains the reception timestamp of the first service message from the correspondence between the message identification information and the reception timestamp.

Optionally, in the case that the device 400 is a non-head node of the transmission tunnel, the first service message includes the total detention time, and the total detention time is the detention of the first service message in each forwarding node that has passed. Sum of time

The processing unit 402 is also used for:

The total detention time included in the first service message and the detention time are accumulated to obtain an accumulated value, and the total detention time included in the first service message is replaced with the accumulated value to obtain the second service message.

In the embodiment of the present application, the receiving unit receives the first service packet, the processing unit obtains the residence time of the first service packet in the first forwarding node; the sending unit sends the second service packet, and the second service packet includes the Detention time. Since the processing unit can accurately obtain the detention time, add the detention time to the second service message, so that the end node of the transmission tunnel receives the second service message according to the information in the second service message. The detention time added by the forwarding node can accurately obtain the transmission time of the business message in the transmission tunnel, thereby improving the accuracy of calculating the transmission time of the business message, so as to ensure that the business message received by the power equipment every time is on the transmission tunnel The change value of the transmission time does not exceed the preset threshold.

Referring to FIG. 15, an embodiment of the present application provides a communication device 500, where the device 500 is deployed in the foregoing second forwarding node and includes:

The receiving unit 501 is configured to receive a second service packet, the second service packet including the residence time of the second service packet on each forwarding node before the device 500, and the device 500 is the end node of the transmission tunnel, The transmission tunnel is a tunnel for transmitting the second service packet, and each forwarding node before the apparatus 500 is a node through which the transmission tunnel passes;

The processing unit 502 is configured to obtain the allowable residence time of the second service packet in the device 500 according to the residence time and the time threshold of the second service packet in each forwarding node;

The sending unit 503 is configured to send the second service message when the detention time of the second service message in the device 500 reaches the allowable detention time.

Optionally, the detailed implementation process for the processing unit 502 to obtain the allowable residence time may refer to related content in step 308 of the embodiment shown in FIG. 6.

Optionally, the processing unit 502 is configured to:

Obtaining the detention time of the second service message in the apparatus 500. The detention time of the second service message in the apparatus 500 means that the second service message is received from the receiving unit 501 until the second service message is received. The time when the service message is buffered in the jitter buffer, where the jitter buffer is the buffer in the device 500;

According to the residence time of the second service packet in each forwarding node, the residence time in the device 500, and the time threshold, the buffering time of the second service packet allowed in the jitter buffer is acquired.

Optionally, for the detailed implementation process of the processing unit 502 obtaining the allowed buffering time of the second service packet in the jitter buffer, refer to related content in steps 3081 to 3082 of the embodiment shown in FIG. 6.

Optionally, the processing unit 502 is configured to:

Acquiring the receiving timestamp of the second service message and acquiring the first timestamp when the second service message is buffered in the jitter buffer;

According to the receiving timestamp and the first timestamp, the residence time of the second service message in the device 500 is obtained.

Optionally, the processing unit 502 is configured to add the receiving timestamp of the second service packet to the second service packet when the receiving unit 501 receives the second service packet; extract the received time stamp from the second service packet Timestamp.

Optionally, the processing unit 502 is configured to store the correspondence between the message identification information of the second service message and the reception timestamp of the second service message when the receiving unit 501 receives the second service message; The message identification information of the second service message obtains the reception timestamp of the second service message from the correspondence between the message identification information and the reception timestamp.

In the embodiment of the present application, the receiving unit receives the second service message, the second service message includes the residence time of the second service message on each forwarding node before the device, and the processing unit according to the second service message in each forwarding node The detention time and the time threshold in the forwarding node are used to obtain the allowable detention time of the second service packet in the second forwarding node. The sending unit sends the second service message when the detention time of the second service message in the device reaches the allowable detention time. Since the second service message includes the detention time on each forwarding node, for any forwarding node, the forwarding node can accurately obtain the detention time of the second service message on itself, so that the processing unit can be based on the detention time of each forwarding node. Time can accurately obtain the allowable detention time of the second service message in the device, and send the second service message when the detention time of the second service message in the device reaches the allowable detention time, so as to ensure that every power equipment The change value of the transmission time of the received service packet on the transmission tunnel does not exceed the preset threshold.

Referring to FIG. 16, an embodiment of the present application provides a communication system 600. The communication system 600 includes a first forwarding node 601 and a second forwarding node 601. The first forwarding node 601 may be the device described in FIG. The second forwarding node may be the device described in FIG. 15 above.

A person of ordinary skill in the art can understand that all or part of the steps in the above embodiments can be implemented by hardware, or by a program to instruct relevant hardware. The program can be stored in a computer-readable storage medium. The storage medium mentioned can be a read-only memory, a magnetic disk or an optical disk, etc.

The above is only an embodiment of the application and is not intended to limit the application. Any modification, equivalent replacement, improvement, etc. made within the principles of the application shall be included in the protection scope of the application.

Claims

A communication method, characterized in that it comprises:

A first forwarding node receives a first service packet, the first forwarding node is a node other than the end node through which a transmission tunnel passes, and the transmission tunnel is a tunnel for transmitting the first service packet;

Acquiring, by the first forwarding node, the residence time of the first service packet in the first forwarding node;

The first forwarding node sends a second service packet, and the second service packet includes the residence time.
The method according to claim 1, wherein the obtaining, by the first forwarding node, the detention time of the first service packet in the first forwarding node comprises:

Acquiring, by the first forwarding node, the reception timestamp and the current timestamp of the first service message;

The first forwarding node obtains the residence time of the first service packet in the first forwarding node according to the receiving timestamp and the current timestamp.
The method according to claim 2, wherein before the first forwarding node obtains the receiving timestamp of the first service message, the method further comprises:

When the first forwarding node receives the first service packet, adding the reception timestamp of the first service packet to the first service packet;

The acquiring, by the first forwarding node, the receiving timestamp of the first service message includes:

The first forwarding node extracts the reception timestamp from the first service message.
The method according to claim 2, wherein before the first forwarding node obtains the receiving timestamp of the first service message, the method further comprises:

When the first forwarding node receives the first service message, save the correspondence between the message identification information of the first service message and the reception timestamp of the first service message;

The acquiring, by the first forwarding node, the receiving timestamp of the first service message includes:

The first forwarding node obtains the reception timestamp of the first service message from the correspondence between the message identification information and the reception timestamp according to the message identification information of the first service message.
The method according to any one of claims 1 to 4, wherein in the case that the first forwarding node is a non-head node of the transmission tunnel, the first service message includes a total detention time, The total detention time is the sum of the detention time of the first service message in each forwarding node that has passed;

Before the first forwarding node sends the second service message, the method further includes:

The first forwarding node accumulates the total detention time included in the first service message and the detention time to obtain an accumulated value, and replaces the total detention time included in the first service message with the accumulated value, Obtain the second service message.
A communication method, characterized in that it comprises:

The second forwarding node receives a second service packet, where the second service packet includes the residence time of the second service packet on each forwarding node before the second forwarding node, and the second forwarding node is An end node of a transmission tunnel, where the transmission tunnel is a tunnel for transmitting the second service packet, and each forwarding node before the second forwarding node is a node through which the transmission tunnel passes;

Acquiring, by the second forwarding node, the allowable residence time of the second service packet in the second forwarding node according to the residence time and the time threshold of the second service packet in the forwarding nodes;

The second forwarding node sends the second service message when the detention time of the second service message in the second forwarding node reaches the allowable detention time.
The method according to claim 6, wherein the second forwarding node obtains the presence of the second service message in the place according to the residence time and the time threshold of the second service message in the forwarding nodes. The allowable stay time in the second forwarding node includes:

The second forwarding node obtains the detention time of the second service packet in the second forwarding node, and the detention time of the second service packet in the second forwarding node refers to The time from when the second forwarding node receives the second service packet to the time when the second service packet is buffered in a jitter buffer, where the jitter buffer is a buffer in the second forwarding node;

The second forwarding node obtains permission for the second service message to be allowed in the second forwarding node according to the detention time of the second service message in the respective forwarding nodes, the detention time in the second forwarding node, and the time threshold. The buffer time in the jitter buffer.
The method according to claim 6 or 7, wherein the acquiring, by the second forwarding node, the detention time of the second service packet in the second forwarding node comprises:

Acquiring, by the second forwarding node, the receiving timestamp of the second service message and acquiring the first timestamp when the second service message is buffered in the jitter buffer;

The second forwarding node obtains the residence time of the second service packet in the second forwarding node according to the receiving timestamp and the first timestamp.
The method according to claim 8, wherein before the second forwarding node obtains the receiving timestamp of the second service packet, the method further comprises:

When the second forwarding node receives the second service packet, add the reception timestamp of the second service packet to the second service packet;

The acquiring, by the second forwarding node, the receiving timestamp of the second service packet includes:

The second forwarding node extracts the reception timestamp from the second service message.
The method according to claim 8, wherein before the second forwarding node obtains the receiving timestamp of the second service packet, the method further comprises:

When the second forwarding node receives the second service message, save the correspondence between the message identification information of the second service message and the reception timestamp of the second service message;

The acquiring, by the second forwarding node, the receiving timestamp of the second service packet includes:

The second forwarding node obtains the reception timestamp of the second service message from the correspondence between the message identification information and the reception timestamp according to the message identification information of the second service message.
A communication device, characterized in that it comprises:

A receiving unit, configured to receive a first service message, the device is a node other than the end node that a transmission tunnel passes through, and the transmission tunnel is a tunnel for transmitting the first service message;

A processing unit, configured to obtain the residence time of the first service packet in the first forwarding node;

The sending unit is configured to send a second service message, where the second service message includes the residence time.
The device according to claim 11, wherein the processing unit is configured to:

Acquiring the receiving timestamp and the current timestamp of the first service message;

Acquire the residence time of the first service packet in the first forwarding node according to the receiving timestamp and the current timestamp.
The device of claim 12, wherein:

The processing unit is configured to add the receiving timestamp of the first service packet to the first service packet when the receiving unit receives the first service packet; Extract the receiving timestamp from the message.
The device of claim 12, wherein:

The processing unit is configured to store the difference between the message identification information of the first service message and the reception timestamp of the first service message when the receiving unit receives the first service message Correspondence; obtaining the reception timestamp of the first service message from the correspondence between the message identification information and the reception timestamp according to the message identification information of the first service message.
The device according to any one of claims 11 to 14, wherein in the case that the device is a non-head node of the transmission tunnel, the first service message includes a total detention time, and the detention The total time is the sum of the residence time of the first service message in each forwarding node that has passed;

The processing unit is also used for:

The total detention time included in the first service message and the detention time are accumulated to obtain an accumulated value, and the total detention time included in the first service message is replaced with the accumulated value to obtain the second service Message.
A communication device, characterized in that it comprises:

The receiving unit is configured to receive a second service message, the second service message including the residence time of the second service message on each forwarding node before the device, and the device is the end node of the transmission tunnel , The transmission tunnel is a tunnel for transmitting the second service packet, and each forwarding node before the device is a node through which the transmission tunnel passes;

A processing unit, configured to obtain the allowable residence time of the second service packet in the device according to the residence time and the time threshold of the second service packet in the forwarding nodes;

The sending unit is configured to send the second service message when the stay time of the second service message in the device reaches the allowable stay time.
The device according to claim 16, wherein the processing unit is configured to:

Acquiring the retention time of the second service message in the device, where the retention time of the second service message in the device refers to the reception of the second service message from the receiving unit , It is the time when the second service message is buffered in the jitter buffer, where the jitter buffer is a buffer in the device;

According to the residence time of the second service packet in the forwarding nodes, the residence time in the device, and the time threshold, obtain the buffer time allowed for the second service packet in the jitter buffer .
The device according to claim 16 or 17, wherein the processing unit is configured to:

Acquiring the receiving timestamp of the second service message and acquiring the first timestamp when the second service message is buffered in the jitter buffer;

According to the receiving timestamp and the first timestamp, obtaining the residence time of the second service message in the device.
The device of claim 18, wherein:

The processing unit is configured to add a receiving timestamp of the second service packet to the second service packet when the receiving unit receives the second service packet; Extract the receiving timestamp from the message.
The device of claim 18, wherein:

The processing unit is configured to store the difference between the message identification information of the second service message and the reception timestamp of the second service message when the receiving unit receives the second service message Correspondence; obtaining the reception timestamp of the second service message from the correspondence between the message identification information and the reception timestamp according to the message identification information of the second service message.
A communication system, characterized by comprising: the device according to any one of claims 11 to 15 and/or the device according to any one of claims 16 to 20.
A computer-readable storage medium, characterized by comprising a program, which when running on a computer, causes the computer to execute the method described in any one of claims 1-10.
A computer program product, characterized by comprising a program, which when running on a computer, causes the computer to execute the method described in any one of claims 1-10.