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

An adaptive transmission and streaming media technology, which is applied in the transmission system, digital transmission system, error prevention/detection using the return channel, etc., can solve the problem of affecting the display effect of the receiving end, the large jitter of the sending rate, and the reduction of network utilization, etc. problem, to achieve the effect of ensuring reliable transmission and playback quality, alleviating channel congestion, and reducing delay

Active Publication Date: 2015-05-13
ZHEJIANG SCI-TECH UNIV
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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 rat...

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

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Embodiment Construction

[0039] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] Such as figure 1 , figure 2 Shown, the present invention is based on the streaming media wireless adaptive transmission method of TCP / UDP mixed protocol, comprises the steps:

[0041] (1) The sender uses the reliable TCP protocol to establish a two-way level 0 channel with the receiver, and uses the unreliable UDP protocol to establish a one-way level 1 channel with the receiver, such as image 3 shown.

[0042] In this embodiment, the level 0 channel transmits key frame data from the sending end to the receiving end, and the control information packet is transmitted from the receiving end to the sending end, which is reliable transmission; the level 1 channel transmits non-key frame data, which is Unreliable transmission.

[0043] The control i...

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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 ...

Claims

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Application Information

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IPC IPC(8): H04L29/06H04L29/08H04L1/16
CPCH04L1/1678H04L67/1027H04L69/16H04L65/762H04L65/764
Inventor 陆斌张华熊胡洁
Owner ZHEJIANG SCI-TECH UNIV
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