TCP/UDP (Transmission Control Protocol and User Datagram Protocol) mixed protocol based streaming media wireless self-adaptive transmission method

Abstract

The invention discloses a TCP / UDP (Transmission Control Protocol and User Datagram Protocol) mixed protocol based streaming media wireless self-adaptive transmission method. The reliable transmission of a TCP is combined with the small transmission overhead, the high speed and the high efficiency of the UDP, the encapsulation is performed on video and audio data through a fixed length of data packet header, and the hierarchical transmission is performed through different channels according to different data frame types. A receiver is provided with a data packet life cycle threshold vale and a feedback information packet is sent to a sender if the timeout of the data receiving is produced. The sender starts to discard non-critical frame data of the unreliable transmission channels and accordingly the channel congestion is alleviated, the audio and video delay is reduced, and the real-time performance of the streaming media playing is ensured. In addition, the dynamic adjustment on the coding rate of the sender is implemented by an average code rate weighed control algorithm according to the channel transmission data received by the receiver and accordingly the good self-adaption to the changes of the wireless channel bandwidth can be achieved.

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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