Message transmission method and terminal, network equipment and communication system

Abstract

The invention discloses a message transmission method. The method comprises the following steps that a sending terminal retransmits a first message after determining that the first message is lost andreduces a congestion window and / or a slow start threshold; a receiving terminal sends an ACK aiming at the retransmitted first message to the sending terminal after firstly receiving the retransmitted first message, the ACK contains an active constructed DSACK option, the DSACK option is sent to the sending terminal so as to prompt the sending terminal that the first message is repeatedly received; and the sending terminal deduces that the first message is disordered and packet loss because of congestion is not generated according to a serial number recorded in the DSACK option, and because retransmission triggered by first message packet loss and congestion window retreat are unnecessary, the congestion window and / or the slow start threshold are compensated.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a message transmission method, a terminal and a communication system. Background technique [0002] TCP (Transmission Control Protocol) is a connection-oriented, reliable, byte stream-based transport layer communication protocol. In order to ensure the reliability of message transmission, TCP assigns a sequence number (Sequence Number) to each message, and the sequence number ensures the orderly reception of the messages transmitted to the receiving end. For a message that has been successfully received, the receiving end will reply a corresponding acknowledgment message (Acknowledgment, ie ACK) to the sending end, and the acknowledgment message will carry the serial number of the received message. If the sending end does not receive the acknowledgment message within a reasonable round-trip time delay (Round-Trip Time, ie RTT), then the corresponding message will b...

AI Technical Summary

Problems solved by technology

[0004] Although the congestion control algorithm can suppress network congestion to a certain extent, it may also unreasonably limit the data transmission rate, especially in the wireless network environment, because the channel quality of the wireless link is easily affected by many factors, such as in the signal In scenarios such as weak coverage, wireless links often lose packets due to non-congestion factors such as bit errors. Based on traditional congestion control algorithms, the sender will judge that the network is congested according to the packet loss, and actively reduce the congestion window, which will cause the receiver to The downlink throughput rate of the terminal is reduced, which affects the user's online experience

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