Method and device for wireless side tcp data retransmission

A technology of data retransmission and wireless side, applied in the field of communication, can solve the problems of inability to reasonably solve the problem of wireless retransmission processing and waste of system resources, so as to improve performance and utilization of air interface resources, avoid waste of system resources, and achieve fast retransmission. Effect

Active Publication Date: 2015-09-09
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

[0022] The embodiment of the present invention provides a method and device for retransmitting TCP data on the wireless side, which solves the problem that the retransmission process on the wireless side cannot be reasonably solved in the existing technical solution in a system with TCP connections across wireless networks, resulting in waste of system resources

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  • Method and device for wireless side tcp data retransmission
  • Method and device for wireless side tcp data retransmission
  • Method and device for wireless side tcp data retransmission

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Embodiment Construction

[0042] As mentioned in the background, TCP is a reliable transmission protocol researched and developed for the wired network Internet. The transmission characteristics of the wired network are low bit error rate and easy congestion. Therefore, its transmission control algorithm is mainly designed based on the network congestion model.

[0043] However, when a TCP connection spans both wired and wireless networks, TCP will not be able to adapt to the characteristics of wireless transmission channels such as high bit error rate, high delay jitter, cell switching, out-of-sequence, etc., causing false slow start and congestion avoidance. And retransmission, when the quality of the air interface recovers quickly, TCP data cannot be transmitted in time, resulting in reduced utilization of bandwidth resources, decreased effective bandwidth, and fluctuations in throughput.

[0044] In order to improve the transmission performance of the above-mentioned TCP connections across the wire...

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Abstract

Disclosed in an embodiment of the present invention are a wireless side TCP data retransmission method and device, comprising: by applying the technical solution in the embodiment of the present invention, when a TCP entity receives an uplink message transmitted by a terminal device and containing a Dup ACK message, and if the TCP entity determines that an RLC layer has transmitted to the terminal device all the fragment packets of a data packet corresponding to the Dup ACK message and has received an ACK message returned by the terminal device, then counting and accumulating the Dup ACK messages; and when the count value reaches 2, retransmitting the data packet corresponding to the Dup ACK message, so as to screen the Dup ACK of the terminal device by flexibly utilizing the local data buffering and retransmission characteristics of the TCP entity and in combination with the reliable transmission characteristic of the RLC, and quickly retransmit the TCP layer data, so that the wireless side as an agency on the TCP can accurately determine whether the data packet requires the retransmission of the TCP layer, thus improving TCP performance and air interface resource utilization rate, and avoiding wasting system resources caused by unnecessary data retransmission.

Description

technical field [0001] The invention relates to the technical field of communication, in particular to a method and device for retransmitting TCP data on a wireless side. Background technique [0002] TCP (Transmission Control Protocol, Transmission Control Protocol) is a connection-oriented (connection-oriented), reliable, byte stream-based transport layer (Transport Layer) communication protocol. [0003] On the wireless side of an RNC (Radio Network Controller, radio network controller) with a TCP proxy function or a 3G (3rd Generation, third-generation mobile communication technology) terminal with a TCP entity, due to air interface packet loss and out-of-sequence delivery, the As a result, the terminal receives a large number of out-of-order packets, and the TCP entity of the terminal will send Dup ACK (duplicate acknowledgment) or SACK (selective acknowledgment) after receiving the out-of-order packets, indicating that a certain data packet is lost. [0004] In fact, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/18H04L1/16
CPCH04L1/1867H04L69/326
Inventor 柴新旺
Owner DATANG MOBILE COMM EQUIP CO LTD
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