Base station TCP agency confirmation method based on ARQ information and its system

Abstract

This invention discloses a base station TCP proxy confirmation method based on ARQ information and its system. The method includes sending / receiving and processing the up and down data. The system includes a base station and a mobile station connected by radio links, in which, the base station includes a base station start up and control module, a sending and analyzing module, a base station segment and reassembling module, a proxy confirmation module and a receiving and analyzing module, the mobile station includes a start and control module, a segment reassembling module and a filter module, which increases the mobile rate of the TCP sending window and reduces the probability of timeout of TCP resulted in increasing transmission time delay by the data link layer ARQ.

Description

technical field [0001] The invention belongs to the technical field of data transmission of the TCP / IP protocol in a wireless data communication system, and in particular relates to a base station TCP proxy confirmation method based on ARQ (automatic retransmission request) information and a system thereof. Background technique [0002] The TCP / IP protocol is widely used in the Internet and has become the first protocol for network interconnection. However, the currently used TCP protocol is designed for wired networks. The frame error rate of wired channels is very low and the delay is very small. When the TCP protocol detects that the transmitted segment is lost, it is considered that congestion has occurred on the wired network. The TCP protocol enters slow start, and the congestion window becomes equal to the size of the largest segment, thereby reducing the sending rate of TCP. The frame error rate of the wireless channel in the wireless network is high and the delay i...

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Problems solved by technology

[0003] At present, the solutions proposed abroad mainly include two-segment TCP technology, SNOOP technology and solutions to avoid data frame loss through data link layer ARQ. The two-segment TCP technology has the problem of TCP semantic ambiguity and is quite difficult to implement. The base station needs to At the same time, two TCP connections are established for many pairs of logical TCP connections, and the data is cached, which requires very high CPU processing power and storage requirements for the base station; SNOOP technology requires the intermediate node base station to communicate with the mobile host and the fixed host on the remote wired network. The performance of SNOOP technology will deteriorate when the IP service flow at the network layer is dense, the sending window is small, and the loss rate is high; the ARQ technology at the data link layer will be unreliable and exist The faulty physical link is transformed into a reliable data logical link, and the TCP connection will not enter slow start due to the loss of data frames on the wireless link, which greatly improves the performance of TCP, but the ARQ of the data link layer will increase Transmission delay causes TCP to time out and enter slow start

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