Video transmission congestion control method based on MPTCP in heterogeneous wireless network

Abstract

The invention discloses a video transmission congestion control method based on MPTCP in a heterogeneous wireless network. The method of the invention comprises the steps as follows: establishing a congestion predicating model at a transmitting end firstly; predicating whether a link congestion will occur or not according to variation tendency of round trip delay of a link and adjusting the size of a congestion window; then establishing a bandwidth estimation model at the transmitting end, and judging link quality according to receipt time of adjacent ACK confirmation packets and a bandwidth estimated value obtained by successfully receiving data byte number with the transmitting end; finally establishing a congestion window adjusting model at the transmitting end, and correspondingly adjusting the size of the congestion window and a congestion threshold value according to the bandwidth estimated value of each link and a packet loss condition. The method of the invention could differentiate the link packet loss reasons so as to effectively solve the problem that the throughput capacity of a video flowing is relative low in a wireless channel with high packet loss probability.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to an MPTCP-based video transmission congestion control method in a heterogeneous wireless network. Background technique [0002] With the continuous development of wireless communication technology, the types of application services are constantly enriched. Today, the main body of wireless network transmission is no longer simple text, voice, images, etc., but replaced by streaming media used in live video, video conferencing, etc. Compared with traditional data services, professional video streaming has higher requirements on bandwidth, packet loss rate, end-to-end delay and jitter. The single-path transmission control protocol (Transport Control Protocol, TCP) is difficult to meet these requirements, mainly reflected in: even if there are multiple transmittable paths in the network, the TCP connection can only use one of them, and as the network data flow continues t...

AI Technical Summary

Problems solved by technology

The result of congestion is the increase of end-to-end delay and jitter, the increase of packet loss rate, and even the possibility of system crash. In order to solve this problem, many scholars have proposed different multi-channel concurrent transmission congestion control methods

However, in these methods, as long as the transmission link loses packets, it is considered that the link is congested, and the congestion window is correspondingly reduced to reduce the transmission rate. However, due to the influence of the external environment, the heterogeneous wireless network will also Packet loss occurs, at this time reducing the congestion window will only reduce throughput, so these methods are not suitable for wireless video transmission

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