CN107431965B - Method and device for realizing Transmission Control Protocol (TCP) transmission - Google Patents
Method and device for realizing Transmission Control Protocol (TCP) transmission Download PDFInfo
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- CN107431965B CN107431965B CN201580078316.5A CN201580078316A CN107431965B CN 107431965 B CN107431965 B CN 107431965B CN 201580078316 A CN201580078316 A CN 201580078316A CN 107431965 B CN107431965 B CN 107431965B
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Abstract
The embodiment of the invention discloses a method and a device for realizing Transmission Control Protocol (TCP) transmission, wherein when detecting that a user terminal is switched and connected to a second TCP agent, a first TCP agent establishes connection with the second TCP agent, and first application layer data cached in the first TCP agent and coming from a server is sent to the second TCP agent through the connection between the first TCP agent and the second TCP agent, so that the second TCP agent sends the first application layer data to the user terminal through the TCP connection between the second TCP agent and the user terminal, and the first TCP agent also sends the second application layer data cached by the first TCP agent and coming from the user terminal to the server. By implementing the embodiment of the invention, when the TCP agent is switched due to the movement of the user terminal, the TCP data message stored in the original TCP agent can be sent to the user terminal, thereby reducing the loss and retransmission of the TCP data message and improving the transmission rate of the TCP.
Description
Technical Field
The embodiment of the invention relates to the technical field of communication, in particular to a method and a device for realizing Transmission Control Protocol (TCP) transmission.
Background
The Transmission Control Protocol (TCP) is a transport layer Protocol that is currently widely used on the internet and is capable of providing connection-oriented, reliable, byte stream-based end-to-end data communication services. With the popularization and use of mobile terminals such as smart phones and the like, users have more and more demands on wireless internet access, and therefore TCP-based applications are more and more. However, TCP was originally designed for wired networks and must be improved when applied to wide area networks in which mobile communication systems (such as long term evolution LTE networks) are present.
Currently, people improve and expand TCP applied in a wide area network having an LTE network, for example, in order to avoid data congestion of TCP connection in the wide area network including a 2G/3G mobile communication system, a scheme for implementing a TCP proxy based on a Radio Network Controller (RNC) is proposed, and its specific idea is: in the scheme, when a user terminal moves to switch a TCP proxy, the TCP data message stored on an original TCP proxy cannot be sent to the user terminal, which causes packet loss and retransmission of the TCP data message.
Disclosure of Invention
The embodiment of the invention discloses a method and a device for realizing Transmission Control Protocol (TCP) transmission, which can reduce the loss and retransmission of TCP data messages when a TCP agent is switched due to the movement of a user terminal.
The first aspect of the embodiment of the invention discloses a method for realizing transmission control protocol TCP transmission, which is applied to a first TCP agent in a wireless network, the wireless network also comprises a second TCP agent, a first TCP connection exists between the first TCP agent and a user terminal, a second TCP connection exists between the first TCP agent and a server, and the method comprises the following steps:
when detecting that the user terminal is switched to be connected to the second TCP agent, the first TCP agent establishes a third connection with the second TCP agent;
the first TCP agent sends the first application layer data cached in the first TCP agent to the second TCP agent through the third connection, so that the second TCP agent sends the first application layer data to the user terminal through a fourth TCP connection between the second TCP agent and the user terminal, and the first application layer data is a TCP data message sent by the server through the second TCP connection;
and the first TCP agent sends second application layer data cached in the first TCP agent to the server, wherein the second application layer data is a TCP data message sent by the user terminal through the first TCP connection.
In a first possible implementation manner of the first aspect of the present invention, the sending, by the first TCP proxy, the second application layer data cached in the first TCP proxy to the server includes:
and the first TCP agent sends the second application layer data cached in the first TCP agent to the server through the second TCP connection.
With reference to the first aspect of the present embodiment, in a second possible implementation manner of the first aspect of the present embodiment, the sending, by the first TCP proxy, the second application layer data cached in the first TCP proxy to the server includes:
and the first TCP agent sends the second application layer data cached in the first TCP agent to the second TCP agent through the third connection, so that the second TCP agent sends the second application layer data to the server through a fifth TCP connection between the second TCP agent and the server.
With reference to the second possible implementation manner of the first aspect of the embodiment of the present invention, in a third possible implementation manner of the first aspect of the embodiment of the present invention, after the first TCP proxy establishes a third connection with the second TCP proxy, the method further includes:
the first TCP agent sends first type parameters of the first TCP connection and second type parameters of the second TCP connection to the second TCP agent through the third connection, the first type parameters are used for establishing the fourth TCP connection, and the second type parameters are used for establishing the fifth TCP connection;
the first type of parameters include a socket file descriptor of the first TCP connection, a sending window value of the first TCP connection, a retransmission timer parameter of the first TCP connection, an IP address of the user terminal, and header information of a TCP data packet sent by the user terminal and received by the first TCP proxy latest, and the second type of parameters include a socket file descriptor of the second TCP connection, a sending window value of the second TCP connection, a retransmission timer parameter of the second TCP connection, an IP address of the server, and header information of a TCP data packet sent by the server and received by the first TCP proxy latest.
With reference to the second possible implementation manner or the third possible implementation manner of the first aspect of the embodiment of the present invention, in a fourth possible implementation manner of the first aspect of the embodiment of the present invention, the fifth TCP connection is further configured to enable the second TCP proxy to send third application layer data to the server and enable the second TCP proxy to receive fourth application layer data sent by the server, where the third application layer data is a TCP data packet sent by the user terminal to the second TCP proxy through the fourth TCP connection;
the fourth TCP connection is further configured to cause the second TCP proxy to send the fourth application layer data to the user terminal.
The second aspect of the embodiments of the present invention discloses a TCP proxy, where the TCP proxy exists in a wireless network, the wireless network further includes a second TCP proxy, a first TCP connection exists between the TCP proxy and a user terminal, a second TCP connection exists between the TCP proxy and a server, and the TCP proxy includes:
the detection module is used for detecting whether the user terminal is switched and connected to the second TCP agent;
the connection module is used for establishing a third connection with the second TCP agent when the detection result of the detection module is positive;
a communication module, configured to send the first application layer data cached in the TCP proxy to the second TCP proxy through the third connection, so that the second TCP proxy sends the first application layer data to the user terminal through a fourth TCP connection between the second TCP proxy and the user terminal, where the first application layer data is a TCP data packet sent by the server through the second TCP connection;
the communication module is further configured to send second layer application data cached in the TCP proxy to the server, where the second layer application data is a TCP data packet sent by the user terminal through the first TCP connection.
In a first possible implementation manner of the second aspect of the embodiment of the present invention, a specific manner in which the communication module sends the second application layer data cached in the TCP proxy to the server is as follows:
and sending the second application layer data cached in the TCP proxy to the server through the second TCP connection.
With reference to the second aspect of the present embodiment, in a second possible implementation manner of the second aspect of the present embodiment, a specific manner in which the communication module sends the second application layer data cached in the TCP proxy to the server is as follows:
and sending the second application layer data cached in the TCP agent to the second TCP agent through the third connection, so that the second TCP agent sends the second application layer data to the server through a fifth TCP connection between the second TCP agent and the server.
With reference to the second possible implementation manner of the second aspect of the present embodiment, in a third possible implementation manner of the second aspect of the present embodiment, the communication module is further configured to send, through the third connection, a first type of parameter of the first TCP connection and a second type of parameter of the second TCP connection to the second TCP proxy, where the first type of parameter is used to establish the fourth TCP connection, and the second type of parameter is used to establish the fifth TCP connection;
the first type of parameters include a socket file descriptor of the first TCP connection, a sending window value of the first TCP connection, a retransmission timer parameter of the first TCP connection, an IP address of the user terminal, and header information of a TCP data packet sent by the user terminal and received by the TCP proxy latest, and the second type of parameters include a socket file descriptor of the second TCP connection, a sending window value of the second TCP connection, a retransmission timer parameter of the second TCP connection, an IP address of the server, and header information of a TCP data packet sent by the server and received by the TCP proxy latest.
With reference to the second possible implementation manner or the third possible implementation manner of the second aspect of the embodiment of the present invention, in a fourth possible implementation manner of the second aspect of the embodiment of the present invention, the fifth TCP connection is further configured to enable the second TCP proxy to send third application layer data to the server and enable the second TCP proxy to receive fourth application layer data sent by the server, where the third application layer data is a TCP data packet sent by the user terminal to the second TCP proxy through the fourth TCP connection;
the fourth TCP connection is further configured to cause the second TCP proxy to send the fourth application layer data to the user terminal.
A third aspect of the embodiments of the present invention discloses a TCP proxy, where the TCP proxy exists in a wireless network, the wireless network further includes a second TCP proxy, a first TCP connection exists between the TCP proxy and a user terminal, a second TCP connection exists between the TCP proxy and a server, the TCP proxy includes a memory, a processor, and a communication device, a set of program codes is stored in the memory, and the processor calls the program codes stored in the memory to perform the following operations:
detecting whether the user terminal is switched to be connected to the second TCP agent;
when detecting that the user terminal is switched to be connected to the second TCP agent, establishing a third connection with the second TCP agent;
the communication device is configured to send the first application layer data cached in the TCP proxy to the second TCP proxy through the third connection, so that the second TCP proxy sends the first application layer data to the user terminal through a fourth TCP connection between the second TCP proxy and the user terminal, where the first application layer data is a TCP data packet sent by the server through the second TCP connection;
the communication device is further configured to send second application layer data cached in the TCP proxy to the server, where the second application layer data is a TCP data packet sent by the user terminal through the first TCP connection.
In a first possible implementation manner of the third aspect of the embodiment of the present invention, a specific manner in which the communication device sends the second application layer data cached in the TCP proxy to the server is as follows:
and sending the second application layer data cached in the TCP proxy to the server through the second TCP connection.
With reference to the third aspect of the present embodiment, in a second possible implementation manner of the third aspect of the present embodiment, a specific manner in which the communication device sends the second application layer data cached in the TCP proxy to the server is as follows:
and sending the second application layer data cached in the TCP agent to the second TCP agent through the third connection, so that the second TCP agent sends the second application layer data to the server through a fifth TCP connection between the second TCP agent and the server.
With reference to the second possible implementation manner of the third aspect of the embodiment of the present invention, in a third possible implementation manner of the third aspect of the embodiment of the present invention, the communication device is further configured to send, through the third connection, a first type of parameter of the first TCP connection and a second type of parameter of the second TCP connection to the second TCP proxy, where the first type of parameter is used to establish the fourth TCP connection, and the second type of parameter is used to establish the fifth TCP connection;
the first type of parameters include a socket file descriptor of the first TCP connection, a sending window value of the first TCP connection, a retransmission timer parameter of the first TCP connection, an IP address of the user terminal, and header information of a TCP data packet sent by the user terminal and received by the TCP proxy latest, and the second type of parameters include a socket file descriptor of the second TCP connection, a sending window value of the second TCP connection, a retransmission timer parameter of the second TCP connection, an IP address of the server, and header information of a TCP data packet sent by the server and received by the TCP proxy latest.
With reference to the second possible implementation manner or the third possible implementation manner of the third aspect of the present invention, in a fourth possible implementation manner of the third aspect of the present invention, the fifth TCP connection is further configured to enable the second TCP proxy to send third application layer data to the server and enable the second TCP proxy to receive fourth application layer data sent by the server, where the third application layer data is a TCP data packet sent by the user terminal to the second TCP proxy through the fourth TCP connection;
the fourth TCP connection is further configured to cause the second TCP proxy to send the fourth application layer data to the user terminal.
In the embodiment of the invention, a first TCP connection exists between a first TCP agent and a user terminal, a second TCP connection exists between the first TCP agent and a server, when the fact that the user terminal is switched and connected to the second TCP agent is detected, the first TCP agent establishes a third connection with the second TCP agent, then the first TCP agent sends first application layer data cached in the first TCP agent to the second TCP agent through the third connection, so that the second TCP agent sends the first application layer data to the user terminal through a fourth TCP connection between the second TCP agent and the user terminal, wherein the first application layer data is a TCP data message sent by the server through the second TCP connection, the second application layer data cached in the first TCP agent is sent to the server, and the second layer application data is a TCP data message sent by the user terminal through the first TCP connection. By implementing the embodiment of the invention, when the TCP agent is switched due to the movement of the user terminal, the TCP data message stored in the original TCP agent can be sent to the user terminal, thereby reducing the loss and retransmission of the TCP data message and improving the transmission rate of the TCP.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a network architecture according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a method for implementing TCP transmission according to an embodiment of the present invention;
fig. 3 is a schematic flowchart of another method for implementing TCP transmission according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a TCP proxy disclosed in the embodiment of the present invention;
fig. 5 is a schematic structural diagram of another TCP proxy disclosed in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention discloses a method and a device for realizing Transmission Control Protocol (TCP) transmission, which can send a TCP data message stored in an original TCP agent to a user terminal when the TCP agent is switched due to the movement of the user terminal, reduce the loss and retransmission of the TCP data message and improve the transmission rate of the TCP. The following are detailed below.
In order to better understand the method for implementing TCP transmission in the embodiment of the present invention, a network architecture suitable for the embodiment of the present invention is described below. Referring to fig. 1, fig. 1 is a schematic structural diagram of a network architecture according to an embodiment of the present invention. As shown in fig. 1, the network architecture includes a wireless network, a user terminal and a server, and the wireless network may include at least two TCP proxies, one of which may serve as a current TCP proxy for TCP transmission between the user terminal and the server, and truncates a TCP connection between the user terminal and the server to form two independent TCP connections, such as a first TCP connection and a second TCP connection in fig. 1, and the user terminal may be a smart phone (e.g., an Android phone, an iOS phone, etc.), a tablet computer, a palmtop computer, and a Mobile Internet device (Mobile Internet Devices, MID), a PAD, etc., the wireless network may be any one of wireless networks such as a long term evolution LTE network, a radio access network RAN, a 2G network, a 3G network, and a 4G network, and the TCP proxy may be a base station in the wireless network (e.g., an evolved base station eNodeB in the LTE network) or a radio network controller RNC in the wireless network, etc., the embodiments of the present invention are not limited.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for implementing TCP transmission according to an embodiment of the present invention. The method shown in fig. 2 is applied to a TCP proxy (also called "first TCP proxy") in the network architecture shown in fig. 1. As shown in fig. 2, the method for implementing TCP transmission may include the following steps:
s201, when detecting that the user terminal is switched to be connected to a second TCP agent, the first TCP agent establishes a third connection with the second TCP agent.
In the embodiment of the present invention, the first TCP proxy is a current TCP proxy for TCP transmission between the user terminal and the server in the network architecture shown in fig. 1, a first TCP connection exists between the first TCP proxy and the user terminal, and a second TCP connection exists between the first TCP proxy and the server, that is, the first TCP proxy divides the TCP connection between the user terminal and the server into two independent first TCP connection and second TCP connection. And the establishment process of the first TCP connection and the second TCP connection is as follows: the method comprises the steps that a network layer on a user terminal side redirects and groups the IP of a user terminal into a first TCP agent, when the user terminal initiates a TCP connection request to a server, the first TCP agent intercepts the TCP connection request and returns a TCP connection response to the user terminal in response to the TCP connection request to establish a first TCP connection, meanwhile, the first TCP agent sends the TCP connection request to the server, and the server sends the TCP connection response to the first TCP agent in response to the TCP connection request to establish a second TCP connection, wherein the first TCP connection is a wireless TCP connection, and the second TCP connection is a wired TCP connection.
In this embodiment of the present invention, when the first TCP proxy detects that the User terminal is switched to be connected to the second TCP proxy due to movement, the first TCP proxy establishes a third connection with the second TCP proxy, where the third connection may be a TCP connection or a User Datagram Protocol (UDP) connection, and the embodiment of the present invention is not limited. The process of establishing the third connection may be: the first TCP agent sends a connection request to the second TCP agent and receives a connection response returned by the second TCP agent in response to the connection request so as to establish a third connection; or the first TCP proxy receives the connection request sent by the second TCP proxy, and sends a connection response to the second TCP proxy in response to the connection request, so as to establish the third connection.
S202, the first TCP agent sends the first application layer data cached in the first TCP agent to the second TCP agent through the third connection.
In the embodiment of the present invention, the first TCP proxy sends the first application layer data cached in the first TCP proxy to the second TCP proxy through the third connection, so that the second TCP proxy sends the first application layer data to the user terminal through a fourth TCP connection between the second TCP proxy and the user terminal, where the first application layer data is a TCP data packet cached in the first TCP proxy and sent by the server through the second TCP connection.
S203, the first TCP agent sends the second application layer data cached in the first TCP agent to the server.
In the embodiment of the present invention, the second application layer data is a TCP data packet cached in the first TCP proxy and sent by the user terminal through the first TCP connection.
As an optional implementation, the sending, by the first TCP proxy, the second application-layer data cached in the first TCP proxy to the server may include:
and the first TCP agent sends the second application layer data cached in the first TCP agent to the server through the second TCP connection.
In the embodiment of the invention, under the condition that the second TCP connection is not disconnected, the first TCP agent can directly send the second application layer data to the server without waiting for the TCP connection established between the second TCP agent and the server and then sending the second application layer data to the server through the second TCP agent, so that the transmission path of the second application layer data is shortened, and the TCP transmission rate is improved.
As another alternative, the sending, by the first TCP proxy, the second application-layer data cached in the first TCP proxy to the server may include:
and the first TCP agent sends the second application layer data cached in the first TCP agent to the second TCP agent through the third connection, so that the second TCP agent sends the second application layer data to the server through a fifth TCP connection between the second TCP agent and the server.
In the embodiment of the invention, compared with the mode that the first TCP agent directly sends the second application layer data to the server through the second TCP connection, the reliability of TCP transmission can be improved by the mode that the first TCP agent firstly sends the second application layer data to the second TCP agent and then the second TCP agent sends the second application layer data to the server through the fifth TCP connection between the second TCP agent and the server.
In the embodiment of the present invention, the first TCP proxy may first compress the application layer data that needs to be sent to the second TCP proxy, and send the compressed application layer data to the second TCP proxy through the third connection, so as to save network resources.
Optionally, the execution sequence of step S202 and step S203 may be exchanged with each other, or may be performed simultaneously, which is not limited in the embodiment of the present invention.
Optionally, after step S201, the first TCP proxy may further perform the following operations:
the first TCP agent sends the first type parameters of the first TCP connection and the second type parameters of the second TCP connection to a second TCP agent through the third connection, wherein:
the first type of parameters may include, but is not limited to, a socket file descriptor of the first TCP connection, a send window value of the first TCP connection, a retransmission timer parameter of the first TCP connection, an IP address of the user terminal, and header information of a TCP data packet sent by the user terminal and newly received by the first TCP proxy, and the second type of parameters may include, but is not limited to, a socket file descriptor of the second TCP connection, a send window value of the second TCP connection, a retransmission timer parameter of the second TCP connection, an IP address of the server, and header information of a TCP data packet sent by the server and newly received by the first TCP proxy.
In the embodiment of the invention, the first type of parameters are used for quickly establishing a fourth TCP connection between the second TCP agent and the user terminal, and the second type of parameters are used for quickly establishing a fifth TCP connection between the second TCP agent and the server, so that the second TCP agent sends the first application layer data to the user terminal through the fourth TCP connection, and sends the second application layer data to the server through the fifth TCP connection, the TCP transmission speed is improved, and the end-to-end time delay of a TCP data message is reduced.
In the embodiment of the present invention, after the first TCP connection is disconnected from the second TCP connection and the fourth TCP connection is established with the fifth TCP connection, the fifth TCP connection is further configured to enable the second TCP proxy to send third application layer data to the server and enable the second TCP proxy to receive the fourth application layer data sent by the server, where the third application layer data is a TCP data packet sent by the user terminal to the second TCP proxy through the fourth TCP connection; the fourth TCP connection is further configured to enable the second TCP proxy to send the fourth application layer data to the user terminal, that is, the second TCP proxy serves as a new TCP proxy to cut off the TCP connection between the user terminal and the server to form two independent fourth TCP connection and a fifth TCP connection.
In the embodiment of the invention, after the TCP agent between the user terminal and the server is switched from the first TCP agent to the second TCP agent, the first TCP agent establishes a third connection with the second TCP agent, the first TCP agent can send the first application layer data from the server cached in the first TCP agent to the second TCP agent via the third connection, so that the second TCP proxy sends the first application layer data to the user terminal over a fourth TCP connection after establishing the fourth TCP connection between the second TCP proxy and the user terminal, meanwhile, the first TCP proxy can also send the second application layer data from the user terminal cached in the first TCP proxy to the server through the second TCP connection, or sending the second application layer data to the second TCP proxy through the third connection, so that the second TCP proxy establishes a fifth TCP connection between the second TCP proxy and the server and then sends the second application layer data to the server through the fifth TCP connection. By implementing the embodiment of the invention, when the TCP agent is switched due to the movement of the user terminal, the TCP data message stored in the original TCP agent is sent to the user terminal and the server through the new TCP agent, the loss and retransmission of the TCP data message are reduced, the TCP transmission rate is improved, and when the TCP data message received by the server from the user terminal or the TCP data message received by the user terminal from the server is lost, the new TCP agent only needs to send the lost TCP data message to the server or the user terminal again when the TCP data message is retransmitted, the whole path between the user terminal and the server is not needed, the TCP transmission efficiency during the retransmission of the TCP data message is improved, and the end-to-end delay of the TCP data message is reduced.
Referring to fig. 3, fig. 3 is a flowchart illustrating another method for implementing TCP transmission according to an embodiment of the present invention. As shown in fig. 3, the method for implementing TCP transmission may include the following steps:
s301, the first TCP agent establishes a first TCP connection with the user terminal.
In the embodiment of the present invention, after the first TCP connection is established, the first TCP proxy may receive, through the first TCP connection, the application layer data sent by the user terminal to the server and send, to the user terminal, the application layer data from the server.
S302, the first TCP agent establishes a second TCP connection with the server.
In the embodiment of the present invention, after the second TCP connection is established, the first TCP proxy may send the application layer data from the user terminal to the server through the second TCP connection and receive the application layer data sent by the server to the user terminal.
And S303, when the user terminal is detected to be switched and connected to the second TCP agent, the first TCP agent establishes a third connection with the second TCP agent.
S304, the first TCP agent sends the first application layer data, the second application layer data, the first type of parameters of the first TCP connection and the second type of parameters of the second TCP connection cached in the first TCP agent to the second TCP agent through the third connection.
In the embodiment of the present invention, the first application layer data is a TCP data packet cached in the first TCP proxy and sent by the server through the second TCP connection, and the second application layer data is a TCP data packet cached in the first TCP proxy and sent by the user terminal through the first TCP connection.
S305, the second TCP agent receives the first application layer data, the second application layer data, the first type of parameters and the second type of parameters.
S306, the second TCP agent establishes a fourth TCP connection between the second TCP agent and the user terminal according to the first type of parameters.
And S307, the second TCP agent establishes a fifth TCP connection between the second TCP agent and the server according to the second type of parameters.
S308, the second TCP agent receives a third application layer data sent by the user terminal to the server through a fourth TCP connection.
S309, the second TCP proxy sends the third application layer data and the second application layer data to the server through the fifth TCP connection.
And S310, the second TCP agent receives the fourth application layer data sent by the server to the user terminal through the fifth connection.
And S311, the second TCP agent sends the fourth application layer data and the first application layer data to the user terminal through the fourth TCP connection.
Optionally, the execution sequence of the step S306 and the step S307 may be exchanged with each other or performed simultaneously, and the execution sequence of the step S308 and the step S309 may be exchanged with the execution sequence of the step S310 and the step S311 or performed simultaneously, which is not limited in the embodiment of the present invention.
By implementing the embodiment of the invention, when the TCP agent is switched due to the movement of the user terminal, the TCP data message stored in the original TCP agent is sent to the user terminal and the server through the new TCP agent, the loss and retransmission of the TCP data message are reduced, the TCP transmission rate is improved, and when the TCP data message received by the server from the user terminal or the TCP data message received by the user terminal from the server is lost, the new TCP agent only needs to send the lost TCP data message to the server or the user terminal again when the TCP data message is retransmitted, the whole path between the user terminal and the server is not needed, the TCP transmission efficiency during the retransmission of the TCP data message is improved, and the end-to-end delay of the TCP data message is reduced.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a TCP proxy according to an embodiment of the present invention. The TCP proxy 400 shown in fig. 4 is a first TCP proxy for TCP transmission between the user terminal and the server in the network architecture shown in fig. 1, and a first TCP connection exists between the TCP proxy 400 and the user terminal, and a second TCP connection exists between the TCP proxy 400 and the server. As shown in fig. 4, the TCP proxy 400 may include a detection module 401, a connection module 402, and a communication module 403, wherein:
the detecting module 401 is configured to detect whether the user equipment is switched to the second TCP proxy.
The connection module 402 is configured to establish a third connection with the second TCP proxy when the detection result of the detection module 401 is yes.
In this embodiment of the present invention, the first TCP connection and the second TCP connection may also be established by the connection module 402.
The communication module 403 is configured to send the first application layer data cached in the TCP proxy 400 to the second TCP proxy through the third connection, so that the second TCP proxy sends the first application layer data to the user terminal through a fourth TCP connection between the second TCP proxy and the user terminal, where the first application layer data is a TCP data packet cached in the TCP proxy 400 and sent by the server through the second TCP connection.
The communication module 403 may also be configured to send the second layer application data cached in the TCP proxy 400 to the server, where the second layer application data is a TCP data packet that is cached in the TCP proxy 400 and is sent by the user terminal through the first TCP connection.
As an alternative implementation, the specific way for the communication module 403 to send the second application layer data cached in the TCP proxy 400 to the server may be:
and sending the second application layer data cached in the TCP proxy to the server through the second TCP connection.
In the embodiment of the present invention, under the condition that the second TCP connection is not disconnected, the communication module 403 of the TCP proxy 400 may directly send the second application layer data to the server, and does not need to wait until the TCP connection is established between the second TCP proxy and the server and then send the second application layer data to the server through the second TCP proxy, so that a transmission path of the second application layer data is shortened, and a rate of TCP transmission is increased.
As another optional implementation, the specific way for the communication module 403 to send the second application layer data cached in the TCP proxy 400 to the server may also be:
the second application layer data cached in the TCP proxy 400 is sent to the second TCP proxy through the third connection, so that the second TCP proxy sends the second application layer data to the server through a fifth TCP connection between the second TCP proxy and the server.
In the embodiment of the present invention, compared with a mode in which the communication module 403 directly sends the second application layer data to the server through the second TCP connection, the communication module 403 first sends the second application layer data to the second TCP proxy and then sends the second application layer data to the server through the fifth TCP connection between the second TCP proxy and the server by the second TCP proxy, so that the reliability of TCP transmission can be improved.
As an optional implementation manner, the communication module 403 may be further configured to send, to the second TCP proxy through the third connection, a first type parameter of the first TCP connection and a second type parameter of the second TCP connection, where the first type parameter is used to quickly establish a fourth TCP connection between the second TCP proxy and the user terminal, and the second type parameter is used to quickly establish a fifth TCP connection between the second TCP proxy and the server, where:
the first type of parameters may include, but is not limited to, a socket file descriptor of the first TCP connection, a send window value of the first TCP connection, a retransmission timer parameter of the first TCP connection, an IP address of the user terminal, and header information of a TCP data packet sent by the user terminal and newly received by the communication module 403 of the TCP proxy 400, and the second type of parameters includes a socket file descriptor of the second TCP connection, a send window value of the second TCP connection, a retransmission timer parameter of the second TCP connection, an IP address of the server, and header information of a TCP data packet sent by the server and newly received by the communication module 403 of the TCP proxy 400.
In the embodiment of the present invention, after the first TCP connection is disconnected from the second TCP connection and the fourth TCP connection is established with the fifth TCP connection, the fifth TCP connection is further configured to enable the second TCP proxy to send third application layer data to the server and enable the second TCP proxy to receive the fourth application layer data sent by the server, where the third application layer data is a TCP data packet sent by the user terminal to the second TCP proxy through the fourth TCP connection; the fourth TCP connection is further configured to enable the second TCP proxy to send the fourth application layer data to the user terminal, that is, the second TCP proxy serves as a new TCP proxy to cut off the TCP connection between the user terminal and the server to form two independent fourth TCP connection and a fifth TCP connection.
By implementing the embodiment of the invention, when the TCP agent is switched due to the movement of the user terminal, the TCP data message stored in the original TCP agent is sent to the user terminal and the server through the new TCP agent, the loss and retransmission of the TCP data message are reduced, the TCP transmission rate is improved, and when the TCP data message is retransmitted, the new TCP agent only needs to send the lost TCP data message to the server or the user terminal again, the whole path between the user terminal and the server is not needed, the TCP transmission efficiency during the TCP data message retransmission is improved, and the end-to-end delay of the TCP data message is reduced.
Referring to fig. 5, fig. 5 is a schematic structural diagram of another TCP proxy according to an embodiment of the present invention. The TCP proxy 500 shown in fig. 5 is a first TCP proxy for TCP transmission between the user terminal and the server in the network architecture shown in fig. 1, and a first TCP connection exists between the TCP proxy 500 and the user terminal, and a second TCP connection exists between the TCP proxy 500 and the server. As shown in fig. 5, the TCP proxy 500 may include: at least one processor 501, such as a CPU, a communication device 502, such as a communication interface, etc., a memory 503 and at least one communication bus 504, where the memory 503 may be a high-speed RAM memory, or a non-volatile memory (non-volatile memory), such as at least one disk memory, and optionally, the memory 503 may also be at least one storage device located remotely from the processor 501. Wherein:
a communication bus 504 is used to enable connection communications between these components.
A set of program codes is stored in the memory 503 and the processor 501 calls the program codes stored in the memory 503 for performing the following operations:
detecting whether the user terminal is switched to be connected to a second TCP agent;
and when detecting that the user terminal is switched to be connected to the second TCP agent, establishing a third connection with the second TCP agent.
The communication device 502 is configured to send the first application layer data cached in the TCP proxy 500 to the second TCP proxy through the third connection, so that the second TCP proxy sends the first application layer data to the user terminal through a fourth TCP connection between the second TCP proxy and the user terminal, where the first application layer data is a TCP data packet cached in the TCP proxy 500 and sent by the server through the second TCP connection.
The communication device 502 may be further configured to send the second layer application data cached in the TCP proxy 500 to the server, where the second layer application data is a TCP data packet cached in the TCP proxy 500 and sent by the user terminal through the first TCP connection.
In one embodiment, the specific way for the communication device 502 to send the second application-layer data cached in the TCP proxy 500 to the server may be:
the second application layer data cached in the TCP proxy 500 is sent to the server over the second TCP connection.
In one embodiment, the specific way for the communication device 502 to send the second application layer data cached in the TCP proxy 500 to the server may also be:
and sending the second application layer data cached in the TCP proxy 500 to the second TCP proxy through the third connection, so that the second TCP proxy sends the second application layer data to the server through a fifth TCP connection between the second TCP proxy and the server.
In an embodiment, the communication device 502 may be further configured to send a first type of parameter of the first TCP connection and a second type of parameter of the second TCP connection to a second TCP proxy through the third connection, where the first type of parameter is used to quickly establish the fourth TCP connection, and the second type of parameter is used to quickly establish the fifth TCP connection, where:
the first type of parameters include a socket file descriptor of the first TCP connection, a send window value of the first TCP connection, a retransmission timer parameter of the first TCP connection, an IP address of the user terminal, and header information of a TCP data packet sent by the user terminal and most recently received by the communication device 502 of the TCP proxy 500, and the second type of parameters include a socket file descriptor of the second TCP connection, a send window value of the second TCP connection, a retransmission timer parameter of the second TCP connection, an IP address of the server, and header information of a TCP data packet sent by the server and most recently received by the communication device 502 of the TCP proxy 500.
In an embodiment, the fifth TCP connection may further be configured to enable the second TCP proxy to send third application layer data to the server and enable the second TCP proxy to receive fourth application layer data sent by the server, where the third application layer data is a TCP data packet sent by the user terminal to the second TCP proxy through the fourth TCP connection; the fourth TCP connection may also be to cause the second TCP proxy to send fourth application-layer data to the user terminal.
By implementing the embodiment of the invention, when the TCP agent is switched due to the movement of the user terminal, the TCP data message stored in the original TCP agent is sent to the user terminal and the server through the new TCP agent, the loss and retransmission of the TCP data message are reduced, the TCP transmission rate is improved, and when the TCP data message is retransmitted, the new TCP agent only needs to send the lost TCP data message to the server or the user terminal again, the whole path between the user terminal and the server is not needed, the TCP transmission efficiency during the TCP data message retransmission is improved, and the end-to-end delay of the TCP data message is reduced.
It should be noted that, in the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to relevant descriptions of other embodiments for parts that are not described in detail in a certain embodiment. Further, those skilled in the art should also appreciate that the embodiments described in the specification are preferred embodiments and that the acts and modules referred to are not necessarily required by the invention.
The steps in the method of the embodiment of the invention can be sequentially adjusted, combined and deleted according to actual needs.
The modules in the TCP agent of the embodiment of the invention can be merged, divided and deleted according to actual needs.
The module in the embodiment of the present invention may be implemented by a general-purpose integrated circuit, such as a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC).
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The method and the apparatus for implementing TCP transmission according to the embodiment of the present invention are described in detail above, and the principle and the implementation manner of the present invention are explained herein by applying specific examples, and the description of the above embodiments is only used to help understanding the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (15)
1. A method for realizing Transmission Control Protocol (TCP) transmission is applied to a first TCP agent in a wireless network, the wireless network also comprises a second TCP agent, a first TCP connection exists between the first TCP agent and a user terminal, a second TCP connection exists between the first TCP agent and a server, the first TCP agent and the second TCP agent are both Radio Network Controllers (RNC), and the server is an application server; characterized in that the method comprises:
when detecting that the user terminal is switched to be connected to the second TCP agent, the first TCP agent establishes a third connection with the second TCP agent;
the first TCP agent sends the first application layer data cached in the first TCP agent to the second TCP agent through the third connection, so that the second TCP agent sends the first application layer data to the user terminal through a fourth TCP connection between the second TCP agent and the user terminal, and the first application layer data is a TCP data message sent by the server through the second TCP connection;
and the first TCP agent sends second application layer data cached in the first TCP agent to the server, wherein the second application layer data is a TCP data message sent by the user terminal through the first TCP connection.
2. The method of claim 1, wherein the first TCP agent sends the second application layer data cached in the first TCP agent to the server, comprising:
and the first TCP agent sends the second application layer data cached in the first TCP agent to the server through the second TCP connection.
3. The method of claim 1, wherein the first TCP agent sends the second application layer data cached in the first TCP agent to the server, comprising:
and the first TCP agent sends the second application layer data cached in the first TCP agent to the second TCP agent through the third connection, so that the second TCP agent sends the second application layer data to the server through a fifth TCP connection between the second TCP agent and the server.
4. The method of claim 3, wherein after the first TCP agent establishes a third connection with the second TCP agent, the method further comprises:
the first TCP agent sends first type parameters of the first TCP connection and second type parameters of the second TCP connection to the second TCP agent through the third connection, the first type parameters are used for establishing the fourth TCP connection, and the second type parameters are used for establishing the fifth TCP connection;
the first type of parameters include a socket file descriptor of the first TCP connection, a sending window value of the first TCP connection, a retransmission timer parameter of the first TCP connection, an IP address of the user terminal, and header information of a TCP data packet sent by the user terminal and received by the first TCP proxy latest, and the second type of parameters include a socket file descriptor of the second TCP connection, a sending window value of the second TCP connection, a retransmission timer parameter of the second TCP connection, an IP address of the server, and header information of a TCP data packet sent by the server and received by the first TCP proxy latest.
5. The method according to claim 3 or 4, wherein the fifth TCP connection is further configured to enable the second TCP agent to send third application layer data to the server and enable the second TCP agent to receive fourth application layer data sent by the server, and the third application layer data is a TCP data packet sent by the user terminal to the second TCP agent through the fourth TCP connection;
the fourth TCP connection is further configured to cause the second TCP proxy to send the fourth application layer data to the user terminal.
6. A TCP agent exists in a wireless network, the wireless network also comprises a second TCP agent, a first TCP connection exists between the TCP agent and a user terminal, a second TCP connection exists between the TCP agent and a server, the TCP agent and the second TCP agent are both Radio Network Controllers (RNC), and the server is an application server; wherein said TCP agent comprises:
the detection module is used for detecting whether the user terminal is switched and connected to the second TCP agent;
the connection module is used for establishing a third connection with the second TCP agent when the detection result of the detection module is positive;
a communication module, configured to send the first application layer data cached in the TCP proxy to the second TCP proxy through the third connection, so that the second TCP proxy sends the first application layer data to the user terminal through a fourth TCP connection between the second TCP proxy and the user terminal, where the first application layer data is a TCP data packet sent by the server through the second TCP connection;
the communication module is further configured to send second application layer data cached in the TCP proxy to the server, where the second application layer data is a TCP data packet sent by the user terminal through the first TCP connection.
7. The TCP agent according to claim 6, wherein the communication module sends the second application layer data cached in the TCP agent to the server by:
and sending the second application layer data cached in the TCP proxy to the server through the second TCP connection.
8. The TCP agent according to claim 6, wherein the communication module sends the second application layer data cached in the TCP agent to the server by:
and sending the second application layer data cached in the TCP agent to the second TCP agent through the third connection, so that the second TCP agent sends the second application layer data to the server through a fifth TCP connection between the second TCP agent and the server.
9. The TCP proxy of claim 8, wherein the communication module is further configured to send a first type of parameter of the first TCP connection and a second type of parameter of the second TCP connection to the second TCP proxy via the third connection, wherein the first type of parameter is used to establish the fourth TCP connection, and the second type of parameter is used to establish the fifth TCP connection;
the first type of parameters include a socket file descriptor of the first TCP connection, a sending window value of the first TCP connection, a retransmission timer parameter of the first TCP connection, an IP address of the user terminal, and header information of a TCP data packet sent by the user terminal and received by the TCP proxy latest, and the second type of parameters include a socket file descriptor of the second TCP connection, a sending window value of the second TCP connection, a retransmission timer parameter of the second TCP connection, an IP address of the server, and header information of a TCP data packet sent by the server and received by the TCP proxy latest.
10. The TCP proxy of claim 8 or 9, wherein the fifth TCP connection is further configured to enable the second TCP proxy to send third application layer data to the server and enable the second TCP proxy to receive fourth application layer data sent by the server, where the third application layer data is a TCP data packet sent by the user terminal to the second TCP proxy through the fourth TCP connection;
the fourth TCP connection is further configured to cause the second TCP proxy to send the fourth application layer data to the user terminal.
11. A TCP agent exists in a wireless network, the wireless network also comprises a second TCP agent, a first TCP connection exists between the TCP agent and a user terminal, a second TCP connection exists between the TCP agent and a server, the TCP agent comprises a memory, a processor and a communication device, the TCP agent and the second TCP agent are both a wireless network controller (RNC), and the server is an application server; wherein a set of program code is stored in the memory and the processor invokes the program code stored in the memory to perform the following operations:
detecting whether the user terminal is switched to be connected to the second TCP agent;
when detecting that the user terminal is switched to be connected to the second TCP agent, establishing a third connection with the second TCP agent;
the communication device is configured to send the first application layer data cached in the TCP proxy to the second TCP proxy through the third connection, so that the second TCP proxy sends the first application layer data to the user terminal through a fourth TCP connection between the second TCP proxy and the user terminal, where the first application layer data is a TCP data packet sent by the server through the second TCP connection;
the communication device is further configured to send second application layer data cached in the TCP proxy to the server, where the second application layer data is a TCP data packet sent by the user terminal through the first TCP connection.
12. The TCP proxy of claim 11, wherein the communication device sends the second application layer data cached in the TCP proxy to the server by:
and sending the second application layer data cached in the TCP proxy to the server through the second TCP connection.
13. The TCP proxy of claim 11, wherein the communication device sends the second application layer data cached in the TCP proxy to the server by:
and sending the second application layer data cached in the TCP agent to the second TCP agent through the third connection, so that the second TCP agent sends the second application layer data to the server through a fifth TCP connection between the second TCP agent and the server.
14. The TCP proxy of claim 13, wherein the communication device is further configured to send a first type of parameter of the first TCP connection and a second type of parameter of the second TCP connection to the second TCP proxy via the third connection, wherein the first type of parameter is used to establish the fourth TCP connection, and the second type of parameter is used to establish the fifth TCP connection;
the first type of parameters include a socket file descriptor of the first TCP connection, a sending window value of the first TCP connection, a retransmission timer parameter of the first TCP connection, an IP address of the user terminal, and header information of a TCP data packet sent by the user terminal and received by the TCP proxy latest, and the second type of parameters include a socket file descriptor of the second TCP connection, a sending window value of the second TCP connection, a retransmission timer parameter of the second TCP connection, an IP address of the server, and header information of a TCP data packet sent by the server and received by the TCP proxy latest.
15. The TCP proxy of claim 13 or 14, wherein the fifth TCP connection is further configured to enable the second TCP proxy to send third application layer data to the server and enable the second TCP proxy to receive fourth application layer data sent by the server, where the third application layer data is a TCP data packet sent by the user terminal to the second TCP proxy through the fourth TCP connection;
the fourth TCP connection is further configured to cause the second TCP proxy to send the fourth application layer data to the user terminal.
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| PCT/CN2015/075334 WO2016154831A1 (en) | 2015-03-28 | 2015-03-28 | Method and device for realizing transmission control protocol (tcp) transmission |
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| CN107431965B true CN107431965B (en) | 2020-06-26 |
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| CN109257418B (en) * | 2018-08-22 | 2021-07-13 | 西安电子科技大学 | Segmented reliable transmission method based on mobile reliable transmission agent |
| CN109981229B (en) * | 2019-03-25 | 2022-05-06 | 京信网络系统股份有限公司 | Data processing method and device of RLC layer, computer equipment and storage medium |
| CN110049050B (en) * | 2019-04-22 | 2021-03-19 | 中国科学院计算机网络信息中心 | Communication method and device |
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| CN1722901A (en) * | 2004-07-16 | 2006-01-18 | 华为技术有限公司 | A method of serving radio network subsystem (SRNS) redirection |
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| CN101141781B (en) * | 2006-09-08 | 2010-04-21 | 大唐移动通信设备有限公司 | Inter-cell switch method in base station and data transmission device in switch process |
| KR100950670B1 (en) * | 2006-11-17 | 2010-04-02 | 삼성전자주식회사 | Apparatus and method for transmitting/receiving data in a communication system and wireless network therefor |
| CN102238587A (en) * | 2010-05-05 | 2011-11-09 | 中兴通讯股份有限公司 | Neighboring cell optimization method and mobile communication system |
| CN102026281A (en) * | 2010-12-21 | 2011-04-20 | 大唐移动通信设备有限公司 | Method and device for realizing TCP (transmission control protocol) proxy based on RNC (radio network controller) |
| US8509188B1 (en) * | 2011-02-16 | 2013-08-13 | Sprint Communications Company L.P. | Buffering user data in a core network interface for delivery over a wireless access network |
| CN104170346B (en) * | 2013-02-26 | 2018-03-09 | 华为技术有限公司 | Data transmission method, system and agent equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1722901A (en) * | 2004-07-16 | 2006-01-18 | 华为技术有限公司 | A method of serving radio network subsystem (SRNS) redirection |
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