Semi-tcp packet batch confirmation reply method based on fountain code

Abstract

The invention belongs to the TCP technical field of a multi-hop wireless network, and relates to a semi-TCP packet batch confirmation reply method based on a fountain code. The method includes: 1. When sending and receiving TCP packets at the sending end and receiving end of Semi-TCP, by performing fountain code encoding and decoding on the transport layer data, batch confirmation and reply to the data packets are realized, thereby ensuring reliable transmission Simultaneously compress the number of ACK packets sent, reduce the competition of the forward and reverse data streams on the wireless channel, and improve the throughput performance of the network; ②, ACK replies to the entire data block, which can effectively reduce the impact of the reverse ACK on the forward data stream Competition; ③. Estimate the number of encoded packets sent by the sending end required for decoding by the receiving end. After the actual number of encoded packets sent by the sending end exceeds the estimated value, delay and slow down the transmission to prevent the reverse ACK packet from being unable to be received in time The waste of network resources caused by backhaul.

Description

technical field [0001] The present invention relates to the technical field of TCP (Transmission Control Protocol, transmission control protocol) of a multi-hop wireless network, and in particular to a batch confirmation reply method for quasi-TCP, that is, Semi-TCP. Background technique [0002] In a wireless network, TCP often misjudges network congestion, resulting in unsatisfactory performance. For wired networks, packet loss usually means that the network is congested. However, for wireless networks, there are many other reasons for packet loss, such as high bit error rate of wireless channels, channel competition and conflict, and unreachable paths caused by terminal movement. Frequent packet loss in the wireless network will prevent the increase of the TCP congestion window, resulting in the sending rate always being kept at a low level, thereby greatly reducing the throughput of the network. [0003] Semi-TCP is one of the improved solutions for wireless networks. ...

AI Technical Summary

Problems solved by technology

The existing method of compressing ACK is to delay the transmission of adaptive confirmation packets, which can effectively improve the throughput of the network, but there are also certain defects: the forward data flow is always large, and it is difficult for the receiving end to return the reverse ACK in time. It is difficult for the end to know the packet loss information in time, so the lost data packets cannot be retransmitted in time, resulting in a large accumulation of discontinuous data packets in the buffers of the sending and receiving parties

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