A streaming media wireless adaptive transmission method based on tcp/udp hybrid protocol

Abstract

The invention discloses a streaming media wireless adaptive transmission method based on the TCP / UDP mixed protocol. Firstly, it combines the characteristics of reliable transmission of the TCP protocol with the characteristics of small transmission overhead, high speed and high efficiency of the UDP protocol, and converts video and audio data Encapsulate with a fixed-length data packet header, and use different channels for hierarchical transmission according to different data frame types. Set the data packet lifetime threshold on the receiver, and send a feedback packet to the sender if the receiving data times out. The sender began to discard non-key frame data of unreliable transmission channels, thereby alleviating channel congestion, reducing audio and video delays, and ensuring real-time streaming media playback. In addition, according to the amount of channel transmission data received by the receiver, the present invention uses a weighted average code rate control algorithm to dynamically adjust the code rate of the sender, thereby better adapting to changes in wireless channel bandwidth.

Description

technical field [0001] The invention belongs to the technical field of audio and video data transmission, and in particular relates to a streaming media wireless adaptive transmission method based on a TCP / UDP hybrid protocol. Background technique [0002] In the current various emergency communication system schemes, the video and audio data transmission between the emergency video and audio communication terminal and the command center is mainly implemented based on 3G and other wireless networks. In this application, the complexity of the network environment is far more than that of traditional Wired networks, such as wireless networks, have low bandwidth and high bit errors, which make the effect of traditional video and audio communication terminals based on wired network design always unsatisfactory, such as delay, jitter, blurred screen, and even interruption of video and audio transmission, etc. , which is unacceptable in emergency communications. Therefore, how to ...

AI Technical Summary

Problems solved by technology

However, the current implementations of the TCP protocol (such as TCP-Reno, TCP-NewReno, TCP-SACK) all regard the loss of data packets as an indication of network congestion, and then halve the congestion window, resulting in a large jitter in the sending rate. Affects the display effect of the receiving end

Especially in a wireless network with a high bit error rate, packet loss is largely due to link errors rather than congestion. Blindly entering congestion control will reduce network utilization and affect reception

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