CN107231567B - A message transmission method, device and system - Google Patents

Abstract

A message transmission method, device and system, software defined network SDN controller receives the resource request message sent by user terminal; and the SDN controller sends the resource request message to a server in a proxy mode. A network side router receives a message sent by a server and sends an information header message to be transmitted to an SDN controller; and sending the data body message to be transmitted to each user side router in a preset user side router list. And the user side router modifies a TCP serial number and a TCP acknowledgement serial number included in a Transmission Control Protocol (TCP) message header of the data body message, generates a new data body message for sending to a user terminal, and sends the new data body message to each user terminal in a preset user terminal list. The invention can reduce the occupancy rate of the transmission of the repeated messages to the operator network.

Description

A message transmission method, device and system

technical field

The present invention relates to the field of communication technologies, and in particular, to a message transmission method, device and system.

Background technique

With the development of Internet technology, live video services are widely used.

The current implementation of the live video service mainly adopts the following process: the video is divided into several HTTP files based on the Hyper Text Transfer Protocol (Hyper Text Transfer Protocol, HTTP), and these HTTP files are uploaded to the HTTP streaming media server cluster. When the user terminal requests a live video, it sends an HTTP request to the HTTP streaming media server. After receiving the HTTP request sent by the user terminal, the HTTP streaming media server establishes a TCP link with the user terminal based on the Transmission Control Protocol (TCP), And adopt the end-to-end mode to transmit the message to the user terminal through the operator's network. However, for the same video content, there are usually a large number of user terminals requesting live broadcast. In this way, using the end-to-end message transmission mode, it is necessary to establish a TCP link between the HTTP streaming media server and each user terminal for the request of each user terminal. , and transmit the same video content packets to different user terminals respectively, causing a large number of duplicate content packets to spread in the operator's network, occupying unnecessary bandwidth resources.

SUMMARY OF THE INVENTION

Embodiments of the present invention provide a message transmission method, device, and system, so as to reduce the occupancy rate of an operator's network due to the transmission of repeated messages.

In one aspect, a message transmission method is provided, wherein a network side router receives a message sent by a server, and sends the data body message to a preset user when determining that the message is a data body message to be transmitted. For each user-side router indicated in the router-side router list, the user-side router receives the data body packet sent by the network-side router, and sends the data body packet to at least one user terminal connected to each user-side router. The user terminal connected to the side router will include more than one user terminal, that is, the number of user side routers will be less than the number of user terminals, so the network side router will distribute the packets that need to be transmitted to the user terminal to the user side router. In this way, the number of packets with the same content transmitted in the operator's network can be reduced to a certain extent, and the bandwidth resource occupation rate of the packets with the same content on the operator's network can be reduced to a certain extent.

In a possible design, at least one user terminal connected to the user-side router itself sends a resource request message, the user-side router receives the resource request message, and the user-side router determines that the resource request message is the resource request message. The resource request message to be transmitted, the resource request message to be transmitted refers to the resource request message forwarded by the user-side router to the SDN controller, and sent by the SDN controller to the server in a proxy mode; the user-side router Send the resource request message to the SDN controller. The software defined network (Software Defined Network, SDN) controller intercepts the resource request message sent by the user terminal and forwarded by the router on the user side, and sends the resource request message to the server in a proxy manner, and the server responds to the resource request message. The message includes information header message and data body message. A message of meta-information about attributes, the data body message refers to a message used to carry the content of the data entity sent by the server, and after receiving the message, the network-side router determines the information header to be transmitted and the data body message to be transmitted, the data body message to be transmitted refers to the data body message sent to the user side router via the network side router and distributed to the user terminal by the user side router. The information header message refers to the information header message sent to the SDN controller via the network side router. The network side router sends the information header message to be transmitted to the SDN controller, and the SDN controller realizes the proxy and processing of the information header message, and sends the data body message to be transmitted to the user side router, It is distributed to the user terminal by the user-side router.

In another possible design, after intercepting the resource request message from the user terminal, the SDN controller sends the first control instruction to the network side router, and sends the second control instruction to the user side router.

The first control instruction is used to instruct the network-side router to set the user-side router list, the first flow table and the first cache; the user-side router indicated in the user-side router list is used to receive the data body message to be transmitted The data body message to be transmitted refers to the data body message sent to the user side router via the network side router and distributed to the user terminal by the user side router; the flow table entry included in the first flow table is used to identify The information header message to be transmitted and the data body message to be transmitted, the information header message to be transmitted refers to the information header message sent via the network side router and needs to be sent to the SDN controller; the The first cache is used to cache the data body message received by the network-side server, and the TCP sequence number and the TCP acknowledgment sequence number required by the network-side router to send a transmission control protocol TCP message to the server.

The second control instruction is used to instruct the user-side router to set a terminal list, a second flow table and a second cache. The user terminal indicated in the terminal list is used to receive the data body message to be transmitted; the flow entry included in the second flow table is used to identify the data body message to be transmitted; the second flow table is used to identify the data body message to be transmitted; The cache is used to cache the data body message received by the user-side router, the TCP sequence number of the data body message received by the user-side router, and the data set by the SDN controller for each user terminal indicated in the terminal list. TCP sequence number revision value and TCP acknowledgment sequence number.

The network side router receives the first control instruction and pre-creates the first flow table, and performs in-depth packet detection on the packet according to the flow table entries in the pre-created first flow table, and identifies the received data sent by the server. The message is an information header message to be transmitted, the information header message is sent to the SDN controller, the received message sent by the server is identified as the data body message to be transmitted, and the received message is sent to the SDN controller. The data body message is sent to the user-side router.

The user-side router receives the second control instruction and pre-creates a second flow table. The data body message is the data body message to be transmitted, modify the TCP sequence number and the TCP acknowledgment sequence number included in the transmission control protocol TCP header of the data body message, and generate and send them to the A new data body packet of at least one user terminal connected to the user-side router. The user-side router sends the new data body message to at least one user terminal indicated in the preset terminal list and connected to the user-side router respectively.

In yet another possible design, the user-side router modifies the TCP sequence number and the TCP acknowledgment sequence number included in the TCP header of the data body message in the following manner, including: the user-side router is defined according to software. The revised value of the TCP sequence number set by the network SDN controller modifies the TCP sequence number included in the TCP header of the data body message; wherein, the TCP sequence number included in the modified TCP header is the data The sum of the TCP sequence number included in the TCP header of the body message and the revised value of the TCP sequence number, where the revised value of the TCP sequence number is sent as the sender when the SDN controller establishes a TCP connection with the user terminal The difference between the TCP sequence number of the message and the TCP sequence number of the message sent by the sender when the SDN controller and the server establish a TCP link; the user-side router confirms the sequence number according to the TCP set by the SDN controller , modify the TCP acknowledgment sequence number included in the TCP header of the data body message, wherein the TCP acknowledgment sequence number included in the modified TCP header is the TCP acknowledgment sequence number set by the SDN controller .

In another possible design, after the network-side router determines that the message is a data body message to be transmitted, the network-side router may also cache the received data within the set effective cache time. body message, and buffer the TCP sequence number carried in the received data body message. The network side router sends a transmission control protocol TCP acknowledgment message to the server, wherein the TCP sequence number included in the TCP header of the TCP acknowledgment message is set when the SDN controller and the server exchange messages The TCP sequence number of the TCP acknowledgement packet, the TCP acknowledgement sequence number included in the TCP header of the TCP acknowledgement packet is determined according to the buffered TCP sequence number.

The user-side router buffers the received data body message within the set effective buffering time, and buffers the TCP sequence number carried in the received data body message.

In another aspect, a network-side router is provided, and the network-side router has the function of implementing the network-side router in the above message transmission method. The functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

In a possible design, the network-side router includes a receiving unit, a processing unit, and a sending unit, and the receiving unit is configured to receive a message sent by a server. The processing unit is configured to determine that the message received by the receiving unit is a data body message that needs to be transmitted, and the data body message refers to a message used to carry the content of the data entity sent by the server. The data body message to be transmitted refers to the data body message sent to the user side router via the network side router and distributed by the user side router to the user terminal. The sending unit is configured to send the data body message to be transmitted determined by the processing unit to each user-side router indicated in the preset user-side router list, and send the data body message through each user-side router. The data body message is sent to at least one user terminal respectively connected to each user side router.

In another possible design, the structure of the network side router includes a receiver, a processor and a transmitter, and the processor is configured to support the network side router to perform the corresponding functions in the above method. The receiver and transmitter are used to support the communication between the network side router and the server, the communication between the network side router and the SDN controller, and the communication between the network side router and the user side router. The network-side router may further include a memory, which is coupled to the processor and stores necessary program instructions and data of the network-side router.

In another aspect, a user-side router is provided, and the user-side router has the function of implementing the user-side router in the foregoing packet transmission method. The functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

In a possible design, the user-side router includes a receiving unit, a processing unit, and a sending unit, wherein the receiving unit is used to receive a data body message sent by the network-side router, and the data body message is used for Packets that carry the content of the data entity sent by the server. The processing unit is configured to determine that the data body message received by the receiving unit is a data body message to be transmitted, and modify the TCP sequence included in the transmission control protocol TCP header of the data body message number and TCP acknowledgment sequence number, and generate a new data body message for sending to at least one user terminal connected to the user side router respectively. The data body message to be transmitted refers to the data body message sent to the user side via the network side router The router and the data body packet distributed by the user-side router to the user terminal. The sending unit is configured to send the new data body message generated by the processing unit to at least one user terminal indicated in the preset user terminal list and respectively connected to the user-side router.

In another possible design, the structure of the user side router includes a receiver, a processor and a transmitter, and the processor is configured to support the user side router to perform the corresponding functions in the above method. The receiver and the transmitter are used to support the communication between the user-side router and the network-side router, the communication between the user-side router and the SDN controller, and the communication between the user-side router and the user terminal. The user-side router may further include a memory, which is coupled to the processor and stores necessary program instructions and data of the user-side router.

In yet another aspect, an SDN controller is provided, and the SDN controller has the function of implementing the SDN controller in the above message transmission method. The functions can be implemented by hardware, or can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above functions.

In a possible design, the SDN controller includes a receiving unit and a sending unit, wherein the receiving unit is configured to receive a resource request message forwarded by a router on the user side, where the resource request message is required to be transmitted. Resource request message, the resource request message to be transmitted refers to the resource request message forwarded by the user-side router to the SDN controller, and sent by the SDN controller to the server in a proxy manner. The sending unit is configured to send the resource request message received by the receiving unit to the server in a proxy manner.

In another possible design, the SDN controller includes a receiver and a transmitter, and the receiver and the transmitter are used to support the communication between the SDN controller and the router on the user side, and support the communication between the SDN controller and the network side Communication between routers, and supports communication between SDN controllers and servers.

In yet another aspect, a communication system is provided, which includes the above-mentioned network-side router, user-side router, and SDN controller.

In another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions used by the above-mentioned network-side router, which includes a program for executing the above-mentioned aspects.

In another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions used by the above-mentioned user-side router, which includes a program for executing the above-mentioned aspects.

In another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions used by the above-mentioned SDN controller, which includes a program for executing the above-mentioned aspects.

Compared with the prior art, the solution provided by the embodiment of the present invention can reduce the number of messages with the same content transmitted in the operator's network to a certain extent, and can reduce the impact of the messages with the same content on the operator's network to a certain extent. Bandwidth resource usage.

Description of drawings

1 is a schematic diagram of the architecture of a live video recording system;

FIG. 2 is a system architecture diagram to which an embodiment of the present invention is applicable;

FIG. 3 is an implementation flowchart of a message transmission method provided by an embodiment of the present invention;

4 is a schematic diagram of a process of packet transmission performed by a network-side router according to an embodiment of the present invention;

5 is a schematic diagram of a process of packet transmission performed by a user-side router according to an embodiment of the present invention;

6A to 6C are schematic structural diagrams of a network side router according to an embodiment of the present invention;

7A to 7C are schematic structural diagrams of a user-side router according to an embodiment of the present invention;

8A to 8B are schematic structural diagrams of an SDN controller according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be described in detail below with reference to the accompanying drawings in the embodiments of the present invention.

The message transmission method, device, and system provided by the embodiments of the present invention can be applied to, for example, the live video recording system shown in FIG. 1 . The video files recorded by the live broadcast are divided into several HTTP files based on Hyper Text Transfer Protocol (HTTP), and these HTTP files are uploaded to the HTTP server, and the HTTP server transmits the HTTP files to the user terminal through the operator network.

In the live video recording system shown in FIG. 1 , during the process of transmitting HTTP files to the user terminal, a large number of HTTP packets with repeated content are usually transmitted in the operator's network. In this embodiment of the present invention, in order to avoid, for example, in the live video recording system shown in FIG. 1, excessive and repeated HTTP packets are transmitted in the operator network, causing unnecessary waste of bandwidth resources, the system architecture shown in FIG. 2 can be adopted, The packets that need to be transmitted to the user terminal are distributed to the user-side router through the network-side router, and then distributed to the user-side router by the user-side router. Usually, the user-side router connected to the user-side router will include more than one user terminal, that is, the number of user-side routers. will be less than the number of user terminals, so the network-side router distributes the packets that need to be transmitted to the user terminal to the user-side router, which can reduce the number of packets with the same content transmitted in the operator's network to a certain extent. This reduces the bandwidth resource occupancy rate on the carrier's network for packets with the same content.

The system shown in FIG. 2 includes a user-side router, a network-side router, and a Software Defined Network (SDN) controller. The packets that the server needs to send include information header packets and data body packets, where information headers are used to describe the request operation for network resources, the current state of network resources, and the attributes of network resources in the request/response model. meta information. The data body refers to the content of the data entity transmitted by the server. The information header message refers to a message for carrying an information header. The data body message refers to a message for carrying a data body. The header message and the data body message may have different names in different transmission protocols. For example, when the HTTP transmission protocol is used, the information header message can be called the HTTP protocol message, and the HTTP protocol message includes the resource request message. message and HTTP response message. The data body message may be referred to as an HTTP data message. In the embodiment of the present invention, the SDN controller may be responsible for the proxy or processing of the information header message, and the network side router and the user side router in the operator network process the data body message. The user-side router is connected to the user terminal, receives the resource request message sent by the user terminal, and sends the resource request message to the SDN controller. The SDN controller sends the resource request message to the server in a proxy manner. After receiving the resource request message, the server sends the message. The network-side router connects to the server, receives the message sent by the server, sends the header message to the SDN controller, and distributes the data body message to the user-side router. Each user-side router distributes the data body message to at least one user terminal respectively connected to each user-side router.

For the convenience of description in the following embodiments of the present invention, the information header message sent via the network side router and needs to be sent to the SDN controller is referred to as the information header message to be transmitted, which will be sent to the user side router via the network side router and sent by The data body message distributed by the user-side router to the user terminal is called the data body message to be transmitted.

Generally, the number of user-side routers in an operator network is multiple, and the multiple in this embodiment of the present invention may be understood as at least one. It can be understood that, in this embodiment of the present invention, the data body packets are distributed to the user-side routers through the network-side routers, and then distributed to the user terminals by the user-side routers, so as to reduce the number of identical HTTP packets in the operator's network, which is suitable for In a scenario where the number of user terminals connected to the user side routers is more than the number of the user side routers, that is, the number of user terminals connected to at least one user side router in the multiple user side routers is at least two.

It should be noted that, in the embodiment of the present invention, FIG. 1 takes a live video system as an example for description, but it is not limited thereto, and other systems that use TCP links for packet transmission in an operator network are also applicable.

It should be further noted that the user terminals involved in the embodiments of the present invention may include various handheld devices with wireless communication functions, vehicle-mounted devices, wearable devices, computing devices, or other processing devices connected to the wireless modem, as well as various forms of user equipment (User Equipment, UE), mobile station (Mobile station, MS), terminal (terminal), terminal equipment (Terminal Equipment) and so on.

In the embodiment of the present invention, an implementation process of packet transmission by using the system shown in FIG. 2 will be described below.

FIG. 3 is a flowchart of the implementation of the message transmission method provided by the embodiment of the present invention. As shown in FIG. 3 , the method includes:

S101: The user terminal sends a resource request message.

In this embodiment of the present invention, the user terminal sends a resource request message when it needs to request the server to send a message. For example, when the user terminal needs to perform a live video service, the user terminal can send an HTTP request message to the HTTP server.

S102: The SDN controller intercepts the resource request message sent by the user terminal, and sends the resource request message to the server in a proxy manner.

Optionally, in this embodiment of the present invention, the SDN controller is used to process the information header message, and the network-side router and the user-side router are used to process the data body message, thereby realizing the proxy of message transmission between the server and the user terminal. Therefore, the present invention In the embodiment, the SDN controller sends a first control instruction to the network side router, where the first control instruction is used to instruct the network side router to preset the user side router list, the first flow table and the first cache. Wherein, the user-side routers included in the user-side router list are used to receive the data body message to be transmitted. The flow entry included in the first flow table is used to identify the information header message to be transmitted and the data body message to be transmitted. The first buffer is used for buffering the data body message received by the network side server, and the TCP sequence number and the TCP acknowledgment sequence number required by the network side router to send a transmission control protocol TCP message to the server.

The SDN controller sends a second control instruction to the user-side router, where the second control instruction is used to instruct the user-side router to preset a terminal list, a second flow table, and a second cache. Wherein, the user terminal included in the user terminal list is used to receive the data body message to be transmitted, the flow entry included in the second flow table is used to identify the data body message to be transmitted, and the The second cache is used to cache the data body message received by the user side router, the TCP sequence number of the data body message received by the user side router, and the SDN controller for each user terminal included in the terminal list. Set TCP sequence number revision value and TCP acknowledgment sequence number.

S103: The server sends a message, where the message includes an information header message and a data body message.

The message sent by the server in the embodiment of the present invention may be a message of a certain service type preset by the router on the user side, for example, may be an HTTP video message.

S104: The network-side router receives the message sent by the server, and determines that the message sent by the server is an information header message to be transmitted or a data body message to be transmitted.

In this embodiment of the present invention, the network-side router may preset information header packets and data body packets to be transmitted, that is, may preset a flow table, and the preset flow table may be based on the first information sent by the SDN controller. A control instruction is pre-created, that is, the first flow table mentioned above. When the network-side router receives the information header message sent by the server, it performs in-depth packet inspection on the message according to the flow entry in the pre-created flow table, and identifies the message as the information header that needs to be transmitted. message or data body message. The process of performing in-depth packet detection may be: judging whether there is an IP quintuple and a keyword matching the packet in the pre-created flow table, and if so, the packet is required to be transmitted If it does not exist, continue to judge whether there is an IP quintuple that matches the IP quintuple of the message in the pre-created flow table, if so, the message is required The transmitted data body message.

In this embodiment of the present invention, if the message is an information header message to be transmitted, step S105 is performed. If the message is a data body message to be transmitted, the step of S106 is performed.

S105: If the packet is an information header packet to be transmitted, the network side router sends the information header packet to the SDN controller.

S106: If the message is a data body message to be transmitted, the network side router sends the data body message to each user side router in the preset user side router list.

S107: The network side router buffers the received data body message, and buffers the TCP sequence number carried in the received data body message, so as to update the TCP sequence number of the buffered data body message.

In the embodiment of the present invention, the received data body message is cached in the first cache, and the TCP sequence number of the buffered data body message is recorded, so that the currently received data body message can be determined according to the TCP sequence number. byte number.

The first cache in the embodiment of the present invention is created according to the first control instruction sent by the SDN controller in the foregoing embodiment.

In order to ensure the accuracy of the TCP sequence number of the data body message recorded in the first cache, the TCP sequence number of the cached data body message is updated each time the data body message is cached.

Further, in this embodiment of the present invention, in order to ensure the timeliness of the data body message in the first cache, the aging time of the cached data body message may be set, that is, to cache the data body within the set effective cache time. message.

It should be noted that, in this embodiment of the present invention, S107 is an optional step.

S108: The network-side router sends a TCP confirmation message to the server.

Wherein, the TCP sequence number included in the TCP header of the TCP acknowledgment message is the TCP sequence number set when the SDN controller and the server exchange messages, and the TCP header of the TCP acknowledgment message includes The TCP acknowledgment sequence number is determined according to the TCP sequence number that has been cached by the network side router.

It should be noted that, in this embodiment of the present invention, S108 is an optional step.

It should be further noted that the execution order of S105 , S106 , S107 and S108 is in no particular order.

FIG. 4 is a schematic diagram of a process of packet transmission performed by the router on the network side in the embodiment of the present invention.

S109: The user-side router receives the data body message sent by the network-side router, modifies the TCP sequence number and the TCP acknowledgment sequence number included in the TCP header of the data body message, and generates a packet for sending to the user respectively A new data body message of at least one user terminal connected to the side router.

In the embodiment of the present invention, the SDN controller establishes a common TCP connection with the server, and the user equipment establishes an independent user TCP connection with the SDN controller. Converts the packets of the common TCP connection into the packets of the independent user TCP connection and forwards them to the user terminal.

In the embodiment of the present invention, the user-side router modifies the TCP sequence number included in the TCP header of the data body message according to the revision value of the TCP sequence number set by the SDN controller. Wherein, the TCP sequence number included in the modified TCP header is the sum of the TCP sequence number included in the TCP header of the data body message and the revised value of the TCP sequence number, and the revised TCP sequence number The value is the difference between the TCP sequence number of the message sent by the sender when the SDN controller establishes a TCP link with the user terminal and the TCP sequence number of the message sent by the sender when the SDN controller and the server established a TCP link .

For example, it is assumed that the TCP sequence number of the packet sent by the sending end when the SDN controller establishes a TCP connection with the server is 0. When the SDN controller establishes a TCP link with the user terminal a, the TCP sequence number of the message sent by the sender as the sender is 17, and the revised value of the TCP sequence number=17-0=17.

Assuming that the data body message sent by the current server is the 10000th byte, the TCP sequence number included in the TCP header of the data body message=10000, then the TCP sequence number included in the modified TCP header= 10000+17=10017.

Similarly, the TCP acknowledgment sequence number is determined by the initial TCP sequence number of the message sent by the user terminal and the number of bytes sent, so the TCP acknowledgment sequence numbers of different user terminals are different.

In the embodiment of the present invention, the user-side router modifies the confirmation TCP sequence number included in the TCP header of the data body message according to the TCP confirmation sequence number set by the SDN controller. The TCP acknowledgment sequence number included in the modified TCP header is the TCP acknowledgment sequence number set by the SDN controller, and the TCP acknowledgment sequence number set by the SDN controller is the initial message sent by the user terminal. Add 1 to the sum of the TCP sequence number and the number of bytes sent.

In the embodiment of the present invention, the user-side router may preset the data body message to be transmitted, that is, may preset the flow table, and the preset flow table may be preset according to the second control instruction sent by the SDN controller. The created second flow table, that is, the above-mentioned second flow table, is used to identify the data body message to be transmitted through the flow entry stored in the flow table. After receiving the data body message sent by the network side router, the user-side router can determine whether there is an IP quintuple that matches the IP quintuple of the data body message in the pre-created flow table. It is determined that the data body message is a message that needs to be transmitted to the user terminal, and then the message is modified to generate a new message and send it to the user terminal.

S110: The user-side router sends the new data body message to at least one user terminal indicated in the preset terminal list and respectively connected to the user-side router.

S111: The user-side router buffers the data body message within the set effective buffering time, and buffers the TCP sequence number carried in the received data body message, so as to update the TCP sequence number of the buffered data body message.

In the embodiment of the present invention, the implementation process of the user-side router buffering the message is similar to the process of the network-side router saving the data body message, and details are not repeated here.

In this embodiment of the present invention, S110 and S111 are executed in no particular order.

FIG. 5 is a schematic diagram of a process of packet transmission performed by the router on the user side in the embodiment of the present invention.

In the above method for implementing message transmission in the embodiment of the present invention, the data body message is distributed to the user-side router through the network-side router, and then distributed to the user-side router by the user-side router. Usually, the user-side router connected to the user-side router will include more than one The user terminal implements a tree-like packet transmission method similar to multicast, which replaces the existing end-to-end TCP transmission method between the server and the user terminal, which can reduce the transmission of the same content in the operator network to a certain extent. This reduces the bandwidth resource occupancy rate of the packets with the same content on the carrier's network to a certain extent.

Optionally, in the embodiment of the present invention, the first flow table and the second flow table preset by the user-side router may be updated according to the resource request message received again by the SDN controller. That is, if the SDN controller receives the resource request message sent by the new user terminal, if it is determined that the message requested by the new user terminal is a duplicate message, the SDN controller will no longer send the resource request message to the server. Instead, a response message is generated directly. The SDN controller sends an update instruction to the user-side router to update the second flow table and the terminal list, and adds new user terminal information to the terminal list of the user-side router. The controller issues an update instruction to the network side router to update the first flow table and the user side router list.

The foregoing mainly introduces the solutions provided by the embodiments of the present invention from the perspective of interaction between various network elements. It can be understood that each network element, such as a user-side router, a network-side router, and an SDN controller, includes hardware structures and/or software modules corresponding to each function in order to implement the above-mentioned functions. Those skilled in the art should easily realize that the present invention can be implemented in hardware or a combination of hardware and computer software in conjunction with the units and algorithm steps of each example described in the embodiments disclosed herein. Whether a function is performed by hardware or computer software driving hardware depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each particular application, but such implementations should not be considered beyond the scope of the present invention.

An embodiment of the present invention provides a network side router 100. FIG. 6A shows a possible schematic structural diagram of the network side router 100 provided by the embodiment of the present invention. As shown in FIG. 6A , the network side router 100 includes a receiving unit 101, The processing unit 102 and the sending unit 103, wherein,

The receiving unit 101 is configured to receive the message sent by the server.

The processing unit 102 is configured to determine that the message received by the receiving unit 101 is a data body message to be transmitted, and the data body message refers to a message used to carry the content of the data entity sent by the server. The data body message to be transmitted refers to the data body message sent to the user side router via the network side router and distributed by the user side router to the user terminal.

The sending unit 103 is configured to send the data body message to be transmitted determined by the processing unit 102 to each user-side router indicated in the preset user-side router list, and send the data body message through each user-side router. The data body message is sent to at least one user terminal respectively connected to each user side router.

In an achievable manner, the processor is further configured to: after the receiving unit 101 receives the message sent by the server, determine that the message is an information header message to be transmitted, and the information header message The message refers to the message used to carry the meta-information describing the network resource request operation to the server, the current state of the network resource, and the attribute of the network resource. The information header message to be transmitted refers to the message sent to the SDN controller via the network side router. information header of the device.

The sending unit 103 is further configured to send the information header packet to the SDN controller.

Wherein, the processing unit 102 specifically adopts the following method to determine that the message is an information header message or a data body message to be transmitted:

Perform in-depth packet detection on the packet according to the flow table entry in the pre-created flow table, and identify that the packet is an information header packet or data body packet to be transmitted, wherein the flow table is The network side router is pre-created according to the control instruction sent by the SDN controller when receiving the resource request message sent by the user terminal.

In another achievable manner, the network side router further includes a cache unit 104, as shown in FIG. 6B , wherein,

The cache unit 104 is configured to, after the processing unit 102 determines that the message is a data body message to be transmitted, cache the received data body message within the set effective cache time, and cache the received data body message. The TCP sequence number carried in the received data body packet.

The sending unit 103 is further configured to: send a transmission control protocol TCP acknowledgment message to the server, wherein the TCP sequence number included in the TCP header of the TCP acknowledgment message is for the SDN controller and the server to report. The TCP sequence number set during the file exchange, and the TCP acknowledgement sequence number included in the TCP header of the TCP acknowledgement packet is determined according to the TCP sequence number cached by the cache unit 104 .

FIG. 6C is another possible schematic structural diagram of the network side router 100 according to an embodiment of the present invention. As shown in FIG. 6C , the network side router 100 includes a processor 1001 , a receiver 1002 , a transmitter 1003 , and a memory 1004 .

The memory 1004 is used for storing program codes executed by the processor 1001 .

The processor 1001 is used to call the program stored in the memory 1004, receive the message sent by the server through the receiver 1002, and determine that the received message is the data body message to be transmitted, and transmit the received message through the transmitter 1003. The data body message to be transmitted is sent to each user-side router indicated in the preset user-side router list, and the data body message is sent to at least one of the user-side routers connected to each user-side router through each user-side router. a user terminal.

An embodiment of the present invention provides a computer storage medium for storing computer software instructions used by the above-mentioned network-side router, which includes a program for executing the above-mentioned aspects.

An embodiment of the present invention provides a user-side router. FIG. 7A is a possible schematic structural diagram of a user-side router 200 provided by an embodiment of the present invention. As shown in FIG. 7A , the user-side router 200 includes a receiving unit 201 and a processing unit 202 and sending unit 203, wherein,

The receiving unit 201 is configured to receive a data body packet sent by a network-side router, where the data body packet is a packet used to carry the content of the data entity sent by the server.

The processing unit 202 is configured to determine that the data body message received by the receiving unit 201 is the data body message to be transmitted, and modify the TCP sequence number and the TCP sequence number included in the TCP header of the data body message Confirm the serial number, and generate a new data body message for sending to at least one user terminal connected to the user side router respectively. The data body message to be transmitted refers to the data body message sent to the user side router via the network side router and sent by The data body packet distributed by the user-side router to the user terminal.

The sending unit 203 is configured to send the new data body message generated by the processing unit 202 to at least one user terminal indicated in the preset user terminal list and respectively connected to the user-side router.

The processing unit 202 is specifically configured to modify the TCP sequence number and the TCP acknowledgment sequence number included in the TCP header of the data body message as follows:

The TCP sequence number included in the TCP header of the data body message is modified according to the revised value of the TCP sequence number set by the SDN controller. Wherein, the TCP sequence number included in the modified TCP header is the sum of the TCP sequence number included in the TCP header of the data body message and the revised value of the TCP sequence number, and the revised TCP sequence number The value is the difference between the TCP sequence number of the message sent by the sender when the SDN controller establishes a TCP link with the user terminal and the TCP sequence number of the message sent by the sender when the SDN controller and the server established a TCP link . Modifying the TCP acknowledgment sequence number included in the TCP header of the data body message according to the TCP acknowledgment sequence number set by the SDN controller, wherein the modified TCP acknowledgment sequence number included in the TCP header The TCP acknowledgment sequence number set for the SDN controller.

The processing unit 202 is specifically configured to determine that the data body message is the data body message to be transmitted in the following manner:

According to the flow table entry in the pre-created flow table, identify the data body message as the data body message to be transmitted, wherein the flow table is that the user side router receives the user terminal according to the SDN controller. The control command sent when the resource request message is sent is created in advance.

In a possible implementation manner, the user-side router further includes a cache unit 204, as shown in FIG. 7B , wherein,

The caching unit 204 is configured to, after the receiving unit 201 receives the data body message sent by the network-side router, cache the received data body message within the set valid cache time, and cache the received data body message. The TCP sequence number carried in the data body packet.

In another possible implementation manner, the receiving unit 201 is further configured to receive a resource request message sent by at least one user terminal connected to itself before receiving the data body message sent by the network side router.

The processing unit 202 is further configured to: determine that the resource request message is a resource request message to be transmitted, and the resource request message to be transmitted is forwarded by the user side router to the SDN controller, and sent by the SDN The resource request message sent by the controller to the server in proxy mode.

The sending unit 203 is further configured to: send the resource request message to the SDN controller.

FIG. 7C is another possible schematic structural diagram of the user-side router 200 according to an embodiment of the present invention. As shown in FIG. 7C , the user-side router 200 includes a processor 2001 , a receiver 2002 , a transmitter 2003 , and a memory 2004 .

The memory 2004 is used for storing program codes executed by the processor 2001 .

The processor 2001 is configured to call the program stored in the memory 2004, receive the data body message sent by the network side router through the receiver 2002, determine that the data body message is the data body message to be transmitted, and modify the data body message. the TCP sequence number and the TCP acknowledgment sequence number included in the TCP header of the data body message, and generate a new data body message for respectively sending to at least one user terminal connected to the user side router, and transmit The controller 2003 sends the generated new data body message to at least one user terminal indicated in the preset terminal list and connected to the user side router respectively.

An embodiment of the present invention provides a computer storage medium for storing computer software instructions used by the above-mentioned user-side router, which includes a program for executing the above-mentioned aspects.

An embodiment of the present invention further provides an SDN controller. FIG. 8A shows a possible schematic structural diagram of the SDN controller 300 provided by the embodiment of the present invention. As shown in FIG. 8A , the SDN controller 300 includes a receiving unit 301 and a sending unit 300. Unit 302, wherein the receiving unit 301 is configured to receive the resource request message forwarded by the router on the user side, where the resource request message is the resource request message to be transmitted, and the resource request message to be transmitted refers to the resource request message transmitted by the user The side router forwards the resource request message to the SDN controller, and the SDN controller sends the resource request message to the server in the proxy mode.

The sending unit 302 is configured to send the resource request message received by the receiving unit 301 to a server in a proxy manner.

In a possible implementation manner, the sending unit 302 is further configured to: after the receiving unit 301 receives the resource request message forwarded by the user-side router, send the first control instruction to the network-side router, and send the first control instruction to the user-side router. The router sends the second control instruction.

The first control instruction is used to instruct the network side router to set the user side router list, the first flow table and the first cache. The user-side router indicated in the user-side router list is used to receive the data body message to be transmitted, and the data body message to be transmitted is sent to the user-side router via the network-side router and distributed by the user-side router. The data body packet of the user terminal. The flow entry included in the first flow table is used to identify the information header message to be transmitted and the data body message to be transmitted. Information header message to the SDN controller. The first buffer is used for buffering the data body message received by the network side server, and the TCP sequence number and the TCP acknowledgment sequence number required by the network side router to send a transmission control protocol TCP message to the server.

The second control instruction is used to instruct the user-side router to set a terminal list, a second flow table and a second cache. The user terminal indicated in the terminal list is used to receive the data body message to be transmitted. The flow entry included in the second flow table is used to identify the data body message to be transmitted. The second cache is used to cache the data body message received by the user side router, the TCP sequence number of the data body message received by the user side router, and the SDN controller for each user indicated in the terminal list. The revised value of the TCP sequence number set by the terminal and the TCP acknowledgment sequence number.

FIG. 8B is another schematic structural diagram of the SDN controller 300 according to an embodiment of the present invention, as shown in FIG. 8B . The SDN controller 300 includes a receiver 3001 and a transmitter 3002 .

The receiver 3001 is configured to receive the resource request message forwarded by the router on the user side.

The transmitter 3002 is configured to send the resource request message received by the receiver 3001 to a server in a proxy manner.

Embodiments of the present invention provide a computer storage medium for storing computer software instructions used by the above-mentioned SDN controller, including a program for executing the above-mentioned aspects.

It can be understood that the network-side router 100, the user-side router 200, and the SDN controller 300 involved in the foregoing embodiments of the present invention may be used to implement the functions involved in the foregoing method embodiments, and the specific implementation process may refer to the foregoing method embodiments. Relevant descriptions are not repeated here.

An embodiment of the present invention further provides a message transmission system, which includes the network side router 100, the user side router 200, and the SDN controller 300 mentioned above, and has corresponding functions, which are not repeated here.

In the packet transmission method, device, and system provided by the embodiments of the present invention, the network-side router distributes the packet that needs to be transmitted to the user terminal to the user-side router, and the user-side router receives the data body packet sent by the network-side router, and transmits the packet to the user-side router. The data body packet is sent to at least one user terminal connected to each user-side router, which can reduce the number of packets with the same content transmitted in the operator's network to a certain extent, and can reduce the number of packets with the same content to a certain extent. The bandwidth resource occupancy rate of the operator's network.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention. Thus, provided that these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims (13)

1. A method for packet transmission, comprising:

a network side router receives a message sent by a server, wherein the message comprises a data body message and an information header message;

the network side router carries out deep packet inspection on the packet according to a flow table entry in a pre-created flow table, and identifies that the packet is a data body packet to be transmitted, wherein the flow table is pre-created by the network side router according to a control instruction sent by an SDN controller when receiving a resource request packet sent by a user terminal; the data body message is used for bearing data entity content sent by a server, and the data body message to be transmitted is sent to a user side router through a network side router and distributed to a user terminal by the user side router;

the network side router sends the data body message to each user side router indicated in a preset user side router list, and the data body message is sent to at least one user terminal connected with each user side router through each user side router;

the network side router determines the information header message, wherein the information header message is a message used for bearing meta-information describing network resource request operation on the server, the current state of the network resource and the attribute of the network resource, and the information header message to be transmitted is the information header message sent to the SDN controller by the network side router;

and the network side router sends the information header message to the SDN controller.

2. The method of claim 1, wherein the determining, by the network-side router, that the packet is a header packet to be transmitted comprises:

and the network side router carries out deep packet inspection on the packet according to the flow table entry in the flow table, and identifies that the packet is an information header packet to be transmitted.

3. The method according to any of claims 1 to 2, wherein after the network-side router determines that the packet is a data body packet that needs to be transmitted, the method further comprises:

the network side router caches the received data body message within a set effective caching time and caches a TCP serial number carried by the received data body message;

the network side router sends a Transmission Control Protocol (TCP) confirmation message to the server, wherein a TCP serial number included in a TCP message header of the TCP confirmation message is a TCP serial number set when an SDN controller performs message interaction with the server, and the TCP confirmation serial number included in the TCP message header of the TCP confirmation message is determined according to a cached TCP serial number.

4. A method for packet transmission, comprising:

a user side router receives a resource request message sent by at least one user terminal connected with the user side router;

the user side router determines that the resource request message is a resource request message required to be transmitted, wherein the resource request message required to be transmitted refers to a resource request message which is forwarded to an SDN controller by the user side router and is sent to a server by the SDN controller in a proxy mode;

the user side router sends the resource request message to an SDN controller;

the user side router receives a data body message sent by a network side router, wherein the data body message is used for bearing data entity content sent by a server;

the user side router determines that the data body message is the data body message required to be transmitted, wherein the data body message required to be transmitted is the data body message which is sent to the user side router through the network side router and distributed to the user terminal by the user side router;

the user side router determines that the data body message is a data body message to be transmitted, and the method comprises the following steps:

the user side router identifies the data body message as a data body message to be transmitted according to a flow table entry in a pre-established flow table, wherein the flow table is pre-established by the user side router according to a control instruction sent by an SDN controller when receiving a resource request message sent by a user terminal;

the user side router modifies a TCP serial number and a TCP acknowledgement serial number included in a Transmission Control Protocol (TCP) message header of the data body message and generates a new data body message which is respectively sent to at least one user terminal connected with the user side router;

and the user side router sends the new data body message to at least one user terminal indicated in a preset user terminal list and respectively connected with the user side router.

5. The method of claim 4, wherein the user-side router modifies a TCP sequence number and a TCP acknowledgement sequence number included in a TCP header of the data body packet, including:

the user side router modifies a TCP serial number included in a TCP message header of the data body message according to a TCP serial number revision value set by a Software Defined Network (SDN) controller;

the modified TCP message header comprises a TCP serial number which is the sum of a TCP serial number which is contained in the TCP message header of the data body message and a TCP serial number revision value, wherein the TCP serial number revision value is the difference between the TCP serial number of the message which is sent by a sending end when the SDN controller establishes a TCP link with a user terminal and the TCP serial number of the message which is sent by the sending end when the SDN controller establishes a TCP link with a server;

and the user side router modifies a TCP acknowledgement serial number included in a TCP message header of the data body message according to the TCP acknowledgement serial number set by the SDN controller, wherein the TCP acknowledgement serial number included in the modified TCP message header is the TCP acknowledgement serial number set by the SDN controller.

6. The method according to claim 4 or 5, wherein after the user-side router receives the data body packet sent by the network-side router, the method further comprises:

and the user side router caches the received data body message within the set effective caching time and caches a TCP serial number carried by the received data body message.

7. A network-side router, comprising:

the receiving unit is used for receiving a message sent by a server, wherein the message comprises a data body message and an information header message;

the processing unit is configured to perform deep packet inspection on the packet according to a flow table entry in a pre-created flow table, and identify that the packet is a data body packet to be transmitted, where the flow table is pre-created by the network side router according to a control instruction sent by an SDN controller when receiving a resource request packet sent by a user terminal; the data body message is used for bearing data entity content sent by a server, and the data body message to be transmitted is sent to a user side router through a network side router and distributed to a user terminal by the user side router;

the processing unit is further configured to:

after the receiving unit receives a message sent by a server, determining that the message is a message header message to be transmitted, where the message header message is a message used for carrying meta-information describing a network resource request operation to the server, a current state of a network resource, and a network resource attribute, and the message header message to be transmitted is a message header message sent to an SDN controller via a network-side router;

a sending unit, configured to send the data body packet to be transmitted, which is determined by the processing unit, to each user-side router indicated in a preset user-side router list, and send the data body packet to at least one user terminal connected to each user-side router through each user-side router;

the sending unit is further configured to send the header packet to the SDN controller.

8. The network-side router according to claim 7, wherein the processing unit determines that the packet is a header packet to be transmitted specifically by:

the method comprises the steps of carrying out deep packet inspection on a packet according to a packet entry in a pre-created packet table, and identifying that the packet is a header packet to be transmitted, wherein the packet table is pre-created by a network side router according to a control instruction sent by an SDN controller when receiving a resource request packet sent by a user terminal.

9. The network-side router of any of claims 7 to 8, wherein the network-side router further comprises a caching unit, wherein,

the cache unit is configured to cache the received data body packet within a set effective cache time after the processing unit determines that the packet is a data body packet to be transmitted, and cache a TCP serial number carried by the received data body packet;

the sending unit is further configured to:

and sending a Transmission Control Protocol (TCP) confirmation message to the server, wherein a TCP serial number included in a TCP message header of the TCP confirmation message is a TCP serial number set when the SDN controller performs message interaction with the server, and the TCP confirmation serial number included in the TCP message header of the TCP confirmation message is determined according to the TCP serial number cached by the caching unit.

10. A user-side router, comprising:

a receiving unit configured to: receiving a resource request message sent by at least one user terminal connected with the user terminal;

a processing unit to: determining that the resource request message is a resource request message required to be transmitted, wherein the resource request message required to be transmitted refers to a resource request message which is forwarded to an SDN controller by a user side router and is sent to a server by the SDN controller in a proxy mode;

a transmitting unit configured to: sending the resource request message to an SDN controller;

the receiving unit is further configured to receive a data body packet sent by a network-side router, where the data body packet is a packet for carrying data entity content sent by a server;

the processing unit is further configured to determine that the data body packet received by the receiving unit is a data body packet to be transmitted, modify a TCP sequence number and a TCP acknowledgement sequence number included in a TCP packet header of the data body packet, and generate a new data body packet for being respectively sent to at least one user terminal connected to the user-side router, where the data body packet to be transmitted is a data body packet sent to the user-side router via the network-side router and distributed to the user terminal by the user-side router;

the processing unit is specifically configured to determine that the data body packet is a data body packet to be transmitted according to the following manner:

identifying the data body message as a data body message to be transmitted according to a flow table entry in a pre-created flow table, wherein the flow table is pre-created by the user side router according to a control instruction sent by an SDN controller when receiving a resource request message sent by a user terminal;

the sending unit is further configured to send the new data packet generated by the processing unit to at least one user terminal indicated in a preset terminal list and respectively connected to the user-side router.

11. The user-side router according to claim 10, wherein the processing unit is specifically configured to modify a TCP sequence number and a TCP acknowledgement sequence number included in a TCP packet header of the data body packet as follows:

modifying a TCP serial number included in a TCP message header of the data body message according to a TCP serial number revision value set by a Software Defined Network (SDN) controller;

the modified TCP message header comprises a TCP serial number which is the sum of a TCP serial number which is contained in the TCP message header of the data body message and a TCP serial number revision value, wherein the TCP serial number revision value is the difference between the TCP serial number of the message which is sent by a sending end when the SDN controller establishes a TCP link with a user terminal and the TCP serial number of the message which is sent by the sending end when the SDN controller establishes a TCP link with a server;

and modifying a TCP acknowledgement sequence number included in a TCP message header of the data body message according to the TCP acknowledgement sequence number set by the SDN controller, wherein the TCP acknowledgement sequence number included in the modified TCP message header is the TCP acknowledgement sequence number set by the SDN controller.

12. The user-side router according to claim 10 or 11, wherein the user-side router further comprises a caching unit, wherein,

the cache unit is configured to cache the received data body packet within a set effective cache time after the receiving unit receives the data body packet sent by the network-side router, and cache a TCP serial number carried by the received data body packet.

13. A message transmission system, characterized in that it comprises a network-side router according to any of claims 7 to 9 and a user-side router according to any of claims 10 to 12.

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