CN107231567B - Message transmission method, device and system - Google Patents
Message transmission method, device and system Download PDFInfo
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- CN107231567B CN107231567B CN201610178022.6A CN201610178022A CN107231567B CN 107231567 B CN107231567 B CN 107231567B CN 201610178022 A CN201610178022 A CN 201610178022A CN 107231567 B CN107231567 B CN 107231567B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
- H04N21/2385—Channel allocation; Bandwidth allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
- H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
- H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
- H04N21/24—Monitoring of processes or resources, e.g. monitoring of server load, available bandwidth, upstream requests
- H04N21/2405—Monitoring of the internal components or processes of the server, e.g. server load
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
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method, an apparatus, and a system for packet transmission.
Background
With the development of internet technology, the video live broadcast service is widely applied.
The current video live broadcast service is mainly realized by adopting the following processes: the video is divided into several HTTP files based on hypertext Transfer Protocol (HTTP), which are uploaded to a cluster of HTTP streaming servers. When a user terminal requests a live video, an HTTP request is sent to an HTTP streaming media server, after the HTTP streaming media server receives the HTTP request sent by the user terminal, a TCP link is established between the HTTP streaming media server and the user terminal based on a Transmission Control Protocol (TCP), and a message is transmitted to the user terminal through an operator network in an end-to-end mode. However, for the same video content, there are usually a large number of user terminals requesting live broadcasting, so that an end-to-end message transmission mode is adopted, a TCP link needs to be established between the HTTP streaming server and each user terminal according to the request of each user terminal, and the messages of the same video content are transmitted to different user terminals respectively, so that a large number of messages with repeated content are transmitted in an operator network, and unnecessary bandwidth resources are occupied.
Disclosure of Invention
The embodiment of the invention provides a message transmission method, a message transmission device and a message transmission system, which are used for reducing the occupancy rate of the transmission of repeated messages to an operator network.
On one hand, a message transmission method is provided, in which a network side router receives a message sent by a server, and sends the data body message to each user side router indicated in a preset user side router list when determining that the message is the data body message to be transmitted, the user side router receives the data body message sent by the network side router, and sends the data body message to at least one user terminal respectively connected with each user side router, and usually, the user terminal connected with the user side router may include more than one user terminal, that is, the number of the user side routers is less than that of the user terminals, so the network side router distributes the message to be transmitted to the user terminals to the user side routers, the number of the messages with the same content transmitted in the operator network can be reduced to a certain extent, and the bandwidth resource occupancy rate of the messages with the same content to the operator network can be reduced to a certain extent.
In one possible design, at least one user terminal connected to a user-side router sends a resource request message, the user-side router receives the resource request message, the user-side router determines that the resource request message is a resource request message to be transmitted, and the resource request message to be transmitted refers to a resource request message which is forwarded to an SDN controller by the user-side router and sent to a server by the SDN controller in a proxy manner; and the user side router sends the resource request message to an SDN controller. A Software Defined Network (SDN) controller intercepts a resource request packet sent by a user terminal and forwarded by a user-side router, and sends the resource request packet to a server in a proxy manner, where the server responds to the resource request packet and sends a packet, where the packet includes a header packet and a data body packet, the header packet refers to a packet for carrying meta-information describing a Network resource request operation to the server, a current state of a Network resource, and Network resource attributes, the data body packet refers to a packet for carrying data entity content sent by the server, and after receiving the packet, the Network-side router determines a header packet to be transmitted and a data body packet to be transmitted, and the data body packet to be transmitted refers to 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 header message to be transmitted refers to a header message sent to the SDN controller via the network-side router. The network side router sends the information head message to be transmitted to the SDN controller, the SDN controller realizes the agent and processing of the information head message, and the data body message to be transmitted is sent to the user side router and distributed to the user terminal by the user side router.
In another possible design, after intercepting a resource request message from a user terminal, the SDN controller sends a first control instruction to a network-side router and sends a second control instruction to a user-side router.
The first control instruction is used for instructing the network side router to set a user side router list, a first flow table and a first cache; the user side router indicated in the user side router list is used for receiving 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 is distributed to the user terminal by the user side router; the flow table entry included in the first flow table is used for identifying a header message to be transmitted and a data body message to be transmitted, and the header message to be transmitted refers to a header message which is sent by a network side router and needs to be sent to the SDN controller; the first cache is used for caching the data body message received by the network side server and a TCP serial number and a TCP acknowledgement serial number required by the network side router for sending a transmission control protocol TCP message to the server.
The second control instruction is used for indicating 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 for receiving the data body message to be transmitted; a flow table entry included in the second flow table is used for identifying a data body message required to be transmitted; the second cache is configured to cache a data body packet received by a user-side router, a TCP sequence number of the data body packet received by the user-side router, and a TCP sequence number revision value and a TCP acknowledgement sequence number set by the SDN controller for each user terminal indicated in the terminal list.
The network side router receives the first control instruction, creates a first flow table in advance, carries out deep packet inspection on the packet according to a flow table entry in the first flow table created in advance, identifies that the received packet sent by the server is a header packet to be transmitted, sends the header packet to the SDN controller, identifies that the received packet sent by the server is a data packet to be transmitted, and sends the data packet to the user side router.
And the user side router identifies the received data body message sent by the network side router as a data body message to be transmitted according to the pre-created flow table item in the second flow table, modifies a Transmission Control Protocol (TCP) serial number and a TCP acknowledgement serial number included in a TCP message header of the data body message, and generates a new data body message for being 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 terminal list and respectively connected with the user side router.
In another possible design, the modifying, by the user-side router, the TCP sequence number and the TCP acknowledgement sequence number included in the TCP packet header of the data body packet by using the following method includes: 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.
In another possible design, after the network-side router determines that the packet is a data body packet to be transmitted, the network-side router may further cache the received data body packet within a set effective caching time, and cache a TCP serial number carried by the received data body packet. 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.
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.
On the other hand, a network side router is provided, which has the function of implementing the network side router in the message transmission method. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.
In one possible design, the network-side router includes a receiving unit, a processing unit, and a sending unit, where the receiving unit is configured to receive a packet sent by a server. The processing unit is configured to determine that the packet received by the receiving unit is a data body packet to be transmitted, where the data body packet is a packet for carrying a data entity content sent by a server, and the data body packet to be transmitted is a data body packet sent to a user-side router via a network-side router and distributed to a user terminal by the user-side router. The sending unit is 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 respectively connected to each user-side router through each user-side router.
In another possible design, 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 foregoing method. The receiver and the transmitter are used for supporting communication between the network-side router and the server, supporting communication between the network-side router and the SDN controller, and supporting communication between the network-side router and the user-side router. The network-side router may also include a memory, coupled to the processor, that retains program instructions and data necessary for the network-side router.
In another aspect, a user-side router is provided, where the user-side router has a function of implementing the user-side router in the message transmission method. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.
In a possible design, the user-side router includes a receiving unit, a processing unit, and a sending unit, where the receiving unit is configured to receive a data body packet sent by a network-side router, and the data body packet is a packet for carrying data entity content sent by a server. The processing unit is 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. And the sending unit is configured to send the new data packet generated by the processing unit to at least one user terminal indicated in a 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, where the processor is configured to support the user-side router to perform corresponding functions in the above method. The receiver and the transmitter are used for supporting communication between the user-side router and the network-side router, supporting communication between the user-side router and the SDN controller, and supporting communication between the user-side router and the user terminal. The user-side router may also include a memory, coupled to the processor, that holds program instructions and data necessary for the user-side router.
In another aspect, an SDN controller is provided, where the SDN controller has a function of implementing the SDN controller in the message transmission method. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more modules corresponding to the above-described functions.
In one possible design, the SDN controller includes a receiving unit and a sending unit, where the receiving unit is configured to receive a resource request packet forwarded by a user-side router, where the resource request packet is a resource request packet to be transmitted, and the resource request packet to be transmitted refers to a resource request packet that is forwarded to the SDN controller by the user-side router and sent to a server by the SDN controller in a proxy manner. The sending unit is configured to send the resource request packet received by the receiving unit to a 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 configured to support communication between the SDN controller and a user-side router, communication between the SDN controller and a network-side router, and communication between the SDN controller and a server.
In still another aspect, a communication system is provided, where the communication system includes the above-mentioned network-side router, user-side router, and SDN controller.
In still another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for the network-side router, which includes a program for executing the above aspects.
In still another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for the user-side router, which includes a program for executing the above aspects.
In yet another aspect, an embodiment of the present invention provides a computer storage medium for storing computer software instructions for the SDN controller, which includes a program for executing the above aspects.
Compared with the prior art, the scheme provided by the embodiment of the invention can reduce the number of the messages with the same content transmitted in the operator network to a certain extent, and can reduce the bandwidth resource occupancy rate of the messages with the same content to the operator network to a certain extent.
Drawings
Fig. 1 is a schematic diagram of a video live recording system;
FIG. 2 is a diagram of a system architecture suitable for use with embodiments of the present invention;
fig. 3 is a flowchart of an embodiment of a message transmission method according to the present invention;
fig. 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;
fig. 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;
fig. 6A to fig. 6C are schematic diagrams of a network-side router according to an embodiment of the present invention;
fig. 7A to fig. 7C are schematic structural diagrams of a user-side router according to an embodiment of the present invention;
fig. 8A to 8B are schematic structural diagrams of an SDN controller according to an embodiment of the present invention.
Detailed Description
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, the message transmission device and the message transmission system provided by the embodiment of the invention can be applied to a live video recording system shown in figure 1. The live recorded video files are divided into HTTP files based on hypertext transfer Protocol (HTTP), which are uploaded to an HTTP server that transmits the HTTP files to a user terminal through an operator network.
In the live video recording system shown in fig. 1, a large number of HTTP messages with repeated contents are generally transmitted in the operator network during the process of transmitting the HTTP file to the user terminal. In the embodiment of the present invention, in order to avoid unnecessary bandwidth resource waste caused by too many repeated HTTP messages transmitted in the live video recording system shown in fig. 1 in the operator network, the system architecture shown in fig. 2 may be adopted, where a message to be transmitted to a user terminal is distributed to a user side router through a network side router, and then is distributed to the user terminal by the user side router, and generally, the user terminal connected to the user side router may include more than one user terminal, that is, the number of the user side routers may be less than the number of the user terminals, so that the network side router distributes a message to be transmitted to the user terminal to the user side router, and the number of messages with the same content transmitted in the operator network may be reduced to a certain extent, and the bandwidth resource occupancy rate of the message with the same content to the operator network may be reduced to a certain extent.
The system shown in fig. 2 includes a user-side router, a Network-side router, and a Software Defined Network (SDN) controller. The messages to be sent by the server include a header message and a data body message, wherein the header is meta-information used for describing request operation on the network resource, the current state of the network resource and the attribute of the network resource in a request/response model. The data body refers to the data entity content transmitted by the server. The header message refers to a message for carrying a header. The data body message is 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 an HTTP transmission protocol is adopted, the header message may be referred to as an HTTP protocol message, and the HTTP protocol message includes a resource request message and an HTTP response message. The body message may be referred to as an HTTP data message. In the embodiment of the invention, the SDN controller can be responsible for the agent 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 with the user terminal, receives a resource request message sent by the user terminal, and sends the resource request message to the SDN controller. And the SDN controller sends the resource request message to a server in a proxy mode. The method comprises the steps that a server sends a message after receiving a resource request message, a network side router is connected with the server, receives the message sent by the server, sends an information header message to an SDN controller, distributes a data body message to user side routers, and distributes the data body message to at least one user terminal connected with each user side router through each user side router.
For convenience of description, a header message that is sent by a network-side router and needs to be sent to an SDN controller is called a header message to be transmitted, and a data body message that is sent by the network-side router to a user-side router and distributed to a user terminal by the user-side router is called a data body message to be transmitted.
Generally, the number of the user-side routers in the operator network is multiple, and in the embodiment of the present invention, the multiple is understood to be at least one. It can be understood that, in the embodiment of the present invention, the data body packet is distributed to the user side router by the network side router, and then distributed to the user terminal by the user side router, so as to reduce the number of the same HTTP packets in the operator network, which is suitable for a scenario in which the number of the user terminals connected to the user side router is greater than the number of the user side router, that is, the number of the user terminals connected to at least one user side router in the plurality of user side routers is at least two.
It should be noted that, in the embodiment of the present invention, fig. 1 illustrates a live video system as an example, but is not limited to this, and other systems that use a TCP link to perform message transmission in an operator network may also be applicable.
It should be further noted that the User Terminal according to the embodiments of the present invention may include various handheld devices, vehicle-mounted devices, wearable devices, computing devices or other processing devices connected to a wireless modem, and various forms of User Equipment (UE), Mobile Stations (MS), terminals (Terminal), Terminal Equipment (Terminal Equipment), and the like.
The following describes an implementation process of message transmission by using the system shown in fig. 2 according to an embodiment of the present invention.
Fig. 3 is a flowchart illustrating an implementation of a message transmission method according to an embodiment of the present invention, and as shown in fig. 3, the method includes:
s101: the user terminal sends a resource request message.
In the embodiment of the invention, the user terminal sends the resource request message when needing to request the server to send the message, for example, the user terminal can send the HTTP request message to the HTTP server when needing to carry out video live broadcast service.
S102: the SDN controller intercepts a resource request message sent by a user terminal and sends the resource request message to a server in a proxy mode.
Optionally, in the embodiment of the present invention, an SDN controller processes a header packet, and a network-side router and a user-side router process a data packet, so as to implement a proxy for packet transmission between a server and a user terminal. And the user side router included in the user side router list is used for receiving the data body message required to be transmitted. And the flow table entry included in the first flow table is used for identifying the information header message required to be transmitted and the data body message required to be transmitted. The first cache is used for caching the data body message received by the network side server and a TCP serial number and a TCP acknowledgement serial number required by the network side router for sending a transmission control protocol TCP message to the server.
The SDN controller sends a second control instruction to a user side router, wherein the second control instruction is used for indicating a preset terminal list of the user side router, a second flow table and a second cache. The user terminals included in the user terminal list are used for receiving data body messages required to be transmitted, the flow table entries included in the second flow table are used for identifying the data body messages required to be transmitted, and the second cache is used for caching the data body messages received by the user-side router, the TCP serial numbers of the data body messages received by the user-side router, and the TCP serial number revision values and TCP acknowledgement serial numbers set by the SDN controller for each user terminal included in the terminal list.
S103: the server sends a message, wherein the message comprises 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 user-side router, and may be, for example, an HTTP video message.
S104: the network side router receives a message sent by a server, and determines that the message sent by the server is an information header message required to be transmitted or a data body message required to be transmitted.
In the embodiment of the present invention, a network side router may preset header messages and data body messages to be transmitted, that is, may preset a flow table, where the preset flow table may be created in advance according to a first control instruction sent by an SDN controller, that is, the first flow table referred to above. When receiving an information header message sent by a server, a network side router performs deep message detection on the message according to a flow table entry in a pre-created flow table, and identifies that the message is the information header message or the data body message to be transmitted. The process of performing deep packet inspection may be: judging whether an IP five-tuple and a keyword which are matched with the message exist in a pre-created flow table, if so, the message is an information header message which needs to be transmitted; if not, continuously judging whether an IP five-tuple matched with the IP five-tuple of the message exists in a pre-established flow table, if so, the message is a data body message to be transmitted.
In this embodiment of the present invention, if the packet is a header packet to be transmitted, the step S105 is executed. And if the message is a data body message to be transmitted, executing the step S106.
S105: and if the message is an information header message to be transmitted, the network side router sends the information header message to the SDN controller.
S106: and 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 a preset user side router list.
S107: and the network side router caches the received data body message and caches the TCP serial number carried by the received data body message, so that the cached TCP serial number of the data body message is updated.
According to the embodiment of the invention, the received data body message is cached in the first cache, and the TCP serial number of the cached data body message is recorded, so that the byte number of the currently received data body message can be determined according to the TCP serial number.
In this embodiment of the present invention, the first cache is created according to a first control instruction sent by an SDN controller in the foregoing embodiment.
In order to ensure the accuracy of the TCP sequence number of the data body packet recorded in the first cache, the TCP sequence number of the cached data body packet is updated each time the data body packet is cached.
Furthermore, in the embodiment of the present invention, in order to ensure timeliness of the data body packet in the first cache, the aging time of the cached data body packet may be set, that is, the data body packet is cached within the set effective caching time.
It should be noted that S107 is an optional step in the embodiment of the present invention.
S108: and the network side router sends a TCP (transmission control protocol) confirmation message to the server.
The TCP serial number included in the 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 cached TCP serial number of the network side router.
It should be noted that S108 is an optional step in the embodiment of the present invention.
It should be further noted that the execution order of S105, S106, S107 and S108 is not sequential.
Fig. 4 shows a schematic diagram of a process of packet transmission by a network-side router in the embodiment of the present invention.
S109: the user side router receives a data body message sent by the network side router, modifies a TCP serial number and a TCP acknowledgement serial number included in a 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.
In the embodiment of the invention, a common TCP connection is established between the SDN controller and the server, and the user equipment establishes an independent user TCP connection with the SDN controller, so that when a user-side router sends a data body message to a user terminal in the embodiment of the invention, the message of the common TCP connection needs to be converted into the message of the independent user TCP connection and forwarded to the user terminal.
In the embodiment of the invention, the user side router modifies the TCP serial number included in the TCP message header of the data body message according to the TCP serial number revision value set by the 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, and 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 a TCP link is established between the SDN controller and a user terminal and the TCP serial number of the message which is sent by the sending end when the SDN controller and a server establish the TCP link.
For example, assume that a TCP sequence number of a packet sent as a sending end when the SDN controller establishes a TCP link with a server is 0. When the SDN controller establishes a TCP link with the user terminal a, if a TCP sequence number of a message sent by a sending end is 17, a TCP sequence number revision value is 17-0-17.
Assuming that a data body packet sent by a current server is 10000 bytes, and a TCP sequence number included in a TCP packet header of the data body packet is 10000, a TCP sequence number included in the modified TCP packet header is 10000+17 which is 10017.
Similarly, the TCP ack sequence number is determined by the initial TCP sequence number of the message sent by the ue and the number of bytes sent, so the TCP ack sequence numbers of different ues are different.
In the embodiment of the present invention, the user-side router modifies an acknowledgment TCP sequence number included in a TCP packet header of the data packet according to a TCP acknowledgment sequence number set by the SDN controller. The modified TCP message header comprises a TCP acknowledgement sequence number which is set by the SDN controller and is the sum of the initial TCP sequence number of the message sent by the user terminal and the number of bytes sent plus 1.
In the embodiment of the present invention, the user-side router may preset a data body packet to be transmitted, that is, may preset a flow table, where the preset flow table may be created in advance according to a second control instruction sent by the SDN controller, that is, the second flow table referred to above, and a flow entry stored in the flow table is used to identify the data body packet to be transmitted. After receiving the data body message sent by the network side router, the user side router can judge whether an IP five-tuple matched with the IP five-tuple of the data body message exists in a pre-created flow table, if so, the user side router determines that the data body message is the message needing to be transmitted to the user terminal, and then modifies the message to generate a new message and sends the new message to the user terminal.
S110: and the user side router sends the new data body message to at least one user terminal indicated in a preset terminal list and respectively connected with the user side router.
S111: and the user side router caches the data body message within the set effective caching time, caches the TCP serial number carried by the received data body message, and realizes updating of the TCP serial number of the cached data body message.
The implementation process of the user-side router caching message in the embodiment of the invention is similar to the process of the network-side router storing the data body message, and is not described herein again.
In the embodiment of the invention, the execution sequence of S110 and S111 is not in sequence.
Fig. 5 shows a schematic diagram of a process of packet transmission by a user-side router in the embodiment of the present invention.
In the method for realizing message transmission in the embodiment of the invention, the data body message is distributed to the user side router through the network side router and then distributed to the user terminal through the user side router, generally, the user terminal connected with the user side router can comprise more than one user terminal, and the tree-shaped message transmission method similar to multicast is realized.
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 packet received again by the SDN controller. That is, if the SDN controller receives a resource request message sent by a new user terminal, and if it is determined that the message requested by the new user terminal is a duplicate message, the SDN controller does not send the resource request message to the server any more, but directly generates a response message. And the SDN controller issues an updating instruction to the user side router so as to update the second flow list and the terminal list, and adds new user terminal information into the terminal list of the user side router. And the controller issues an update issuing instruction to the network side router so as to update the first flow list and the user side router list.
The above-mentioned scheme provided by the embodiment of the present invention is introduced mainly from the perspective of interaction between network elements. It is to be understood that, in order to implement the above functions, each network element, such as a user-side router, a network-side router, an SDN controller, and the like, includes a corresponding hardware structure and/or a software module for performing each function. Those of skill in the art will readily appreciate that the present invention can be implemented in hardware or a combination of hardware and computer software, with the exemplary elements and algorithm steps described in connection with the embodiments disclosed herein. Whether a function is performed as hardware or computer software drives hardware depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
Fig. 6A is a schematic diagram of a possible structure of a network-side router 100 according to an embodiment of the present invention, and as shown in fig. 6A, the network-side router 100 includes a receiving unit 101, a processing unit 102, and a sending unit 103, where,
the receiving unit 101 is configured to receive a message sent by a server.
A processing unit 102, configured to determine that the packet received by the receiving unit 101 is a data body packet to be transmitted, where the data body packet is a packet used to carry a data entity content sent by a server, and the data body packet to be transmitted is a data body packet sent to a user-side router via a network-side router and distributed to a user terminal by the user-side router.
A sending unit 103, configured to send the data body packet to be transmitted, which is determined by the processing unit 102, 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 respectively connected to each user-side router through each user-side router.
In one implementation, the processor is further configured to: after the receiving unit 101 receives a packet sent by a server, it is determined that the packet is a header packet to be transmitted, where the header packet is a packet used to carry 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 header packet to be transmitted is a header packet sent to an SDN controller via a network-side router.
The sending unit 103 is further configured to send the header packet to the SDN controller.
The processing unit 102 specifically determines that the packet is a header packet or a data body packet to be transmitted in the following manner:
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 or a data 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.
In another implementation manner, the network-side router further includes a cache unit 104, as shown in fig. 6B, wherein,
the caching unit 104 is configured to, after the processing unit 102 determines that the packet is a data body packet to be transmitted, cache the received data body packet within a set effective caching time, and cache a TCP serial number carried in the received data body packet.
The sending unit 103 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 104.
Fig. 6C is a schematic diagram of another possible structure of the network-side router 100 according to the embodiment of the present invention, and as shown in fig. 6C, the network-side router 100 includes a processor 1001, a receiver 1002, a transmitter 1003, and a memory 1004.
A memory 1004 for storing program codes executed by the processor 1001.
The processor 1001 is configured to invoke the program stored in the memory 1004, receive, through the receiver 1002, the packet sent by the server, determine that the received packet is a data body packet to be transmitted, send, through the transmitter 1003, the data body packet to be transmitted to each user-side router indicated in a preset user-side router list, and send, through each user-side router, the data body packet to at least one user terminal respectively connected to each user-side router.
An embodiment of the present invention provides a computer storage medium for storing computer software instructions for the network-side router, which includes a program for executing the above aspects.
Fig. 7A is a schematic diagram of a possible structure of a user-side router 200 according to an embodiment of the present invention, as shown in fig. 7A, the user-side router 200 includes a receiving unit 201, a processing unit 202, and a sending unit 203, where,
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 for carrying data entity content sent by a server.
A processing unit 202, configured to determine that the data body packet received by the receiving unit 201 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 that is sent to the user-side router via the network-side router and is distributed to the user terminal by the user-side router.
A sending unit 203, configured to send the new data packet generated by the processing unit 202 to at least one user terminal indicated in a preset user terminal list and respectively connected to the user-side router.
The processing unit 202 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:
and modifying the TCP serial number included in the TCP message header of the data body message according to the TCP serial number revision value set by the SDN controller. The modified TCP message header comprises a TCP serial number which is the sum of a TCP serial number which is comprised in the TCP message header of the data body message and a TCP serial number revision value, and 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.
The processing unit 202 is specifically configured to determine that the data body packet is a data body packet to be transmitted according to the following manner:
and 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 the SDN controller when receiving a resource request message sent by a user terminal.
In a possible implementation manner, the user-side router further includes a caching unit 204, as shown in fig. 7B, wherein,
the caching unit 204 is configured to, after the receiving unit 201 receives a data body packet sent by a network-side router, cache the received data body packet within a set effective caching time, and cache a TCP serial number carried in the received data body packet.
In another possible implementation manner, the receiving unit 201 is further configured to: before receiving a data body message sent by a network side router, receiving a resource request message sent by at least one user terminal connected with the network side router.
The processing unit 202 is further configured to: and 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 the SDN controller by a user side router and is sent to a server by the SDN controller in a proxy mode.
The sending unit 203 is further configured to: and sending the resource request message to an SDN controller.
Fig. 7C is a schematic diagram of another possible structure of the user-side router 200 according to the embodiment of the present invention, and as shown in fig. 7C, the user-side router 200 includes a processor 2001, a receiver 2002, a transmitter 2003, and a memory 2004.
A memory 2004 for storing program code executed by the processor 2001.
A processor 2001, configured to invoke the program stored in the memory 2004, receive, through the receiver 2002, a data body packet sent by a network-side router, determine that the data body packet 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, generate a new data body packet for being sent to at least one user terminal connected to the user-side router, respectively, and send, through the transmitter 2003, the generated new data body packet to at least one user terminal indicated in a 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 for the user-side router, which includes a program for executing the above aspects.
Fig. 8A is a schematic diagram of a possible structure of the SDN controller 300 provided in the embodiment of the present invention, and as shown in fig. 8A, the SDN controller 300 includes a receiving unit 301 and a sending unit 302, where the receiving unit 301 is configured to receive a resource request packet forwarded by a user-side router, the resource request packet is a resource request packet that needs to be transmitted, and the resource request packet that needs to be transmitted refers to a resource request packet that is forwarded to the SDN controller by the user-side router and sent to a server by the SDN controller in a proxy manner.
A sending unit 302, configured to send, to a server in a proxy manner, the resource request packet received by the receiving unit 301.
In a possible implementation manner, the sending unit 302 is further configured to: after the receiving unit 301 receives the resource request packet forwarded by the user-side router, it sends a first control instruction to the network-side router, and sends a second control instruction to the user-side router.
The first control instruction is used for instructing the network side router to set a user side router list, a first flow table and a first cache. The user side router indicated in the user side router list is used for receiving 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 flow table entry included in the first flow table is used for identifying a header message to be transmitted and a data body message to be transmitted, where the header message to be transmitted is a header message that is sent by a network-side router and needs to be sent to the SDN controller. The first cache is used for caching the data body message received by the network side server and a TCP serial number and a TCP acknowledgement serial number required by the network side router for sending a transmission control protocol TCP message to the server.
The second control instruction is used for indicating the user side router to set a terminal list, a second flow table and a second cache. And the user terminal indicated in the terminal list is used for receiving the data body message required to be transmitted. And the flow table entry included in the second flow table is used for identifying the data body message required to be transmitted. The second cache is configured to cache a data body packet received by a user-side router, a TCP sequence number of the data body packet received by the user-side router, and a TCP sequence number revision value and a TCP acknowledgement sequence number set by the SDN controller for each user terminal indicated in the terminal list.
Fig. 8B is a schematic diagram of another structure of the SDN controller 300 according to the embodiment of the present invention, as shown in fig. 8B. SDN controller 300 includes a receiver 3001 and a transmitter 3002.
The receiver 3001 is configured to receive a resource request packet forwarded by a user-side router.
The transmitter 3002 is configured to send, to a server, the resource request packet received by the receiver 3001 in a proxy manner.
Embodiments of the present invention provide a computer storage medium for storing computer software instructions for the SDN controller, which includes a program for executing the above aspects.
It can be understood that the network-side router 100, the user-side router 200, and the SDN controller 300 related to the foregoing embodiments of the present invention may be used to implement the functions related to the foregoing embodiments of the method, and a specific implementation process thereof may refer to the relevant description of the foregoing embodiments of the method, and will not be described herein again.
The embodiment of the present invention further provides a packet transmission system, which includes the above-mentioned network side router 100, user side router 200, and SDN controller 300, and has corresponding functions, which are not described herein again.
According to the message transmission method, device and system provided by the embodiment of the invention, the network side router distributes the message to be transmitted to the user terminal to the user side router, the user side router receives the data body message sent by the network side router and sends the data body message to at least one user terminal respectively connected with each user side router, the number of messages with the same content transmitted in the operator network can be reduced to a certain extent, and the bandwidth resource occupancy rate of the messages with the same content to the operator network can be reduced to a certain extent.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such 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 such 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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