Method for improving end-to-end wireless transmission control protocol (TCP) linear network coding

Abstract

The invention provides a method for improving end-to-end wireless transmission control protocol (TCP) linear network coding. Particularly, the method comprises the following steps of: (1) optimizing a network coding head frame design on a network coding layer, so that required parameters of coding and decoding are comprehensively considered, the length of a network coding head is shortened, and the complexity of the network coding head is reduced; (2) according to the condition of wireless network packet loss, designing reasonable sliding windows and coding windows, and optimizing so that the sizes of the sliding windows and the coding windows are equal; (3) determining piggyback information content to be network coding message sequence expected to be received next time; and (4) amending a message loss retransmission mechanism, and starting retransmission when the accumulated packet loss number of coding messages achieves the number of sliding windows. Through the operation, the complexity of network coding can be reduced, and the network coding efficiency and the TCP throughput of an end-to-end system are improved.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to the technical field of TCP transmission performance optimization in the wireless communication process, and specifically refers to an improved method for end-to-end wireless transmission control protocol linear network coding. Background technique [0002] Transmission Control Protocol (TCP) is one of the key protocols of today's Internet protocol stack. Many Internet applications, such as the file transfer protocol FTP and the network terminal protocol Telnet, rely on TCP for reliable data transmission. TCP was originally designed specifically for wired networks, where data loss is mainly caused by congestion. But in wireless networks, data loss is often caused by fading, interference and other physical phenomena, so TCP is not suitable for application in wireless networks. In a wireless network, once packet loss occurs, TCP often mistakenly thinks that there is congestio...

AI Technical Summary

Problems solved by technology

[0004] In the existing technology, the application of the end-to-end linear network coding technology in the wireless transmission control protocol mainly has the following problems: (1) When the network coding layer is coding, the coding of the original message information that needs to be coded is not specified Feasible implementation process; (2) Among the generated network encoding headers, the encoding header is more complex and redundant, which can be further optimized; (3) After the receiving end successfully receives the encoded message, the reply carries the expected Receive a single undecoded original TCP message information, which is inconsistent with the encoding information from the network encoding layer, and should carry the network encoding information expected to be transmitted; (4) The sliding window at the sending end is dynamic, related to the packet loss rate, and does not consider The relationship between encoding window, sliding window, and link packet loss can easily cause network encoding to fail to decode effectively

The above problems increase the complexity of decoding at the receiving end, which is difficult to implement and is not conducive to the actual promotion and use

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