Real-time streaming media transmission method in multi-hop network

Abstract

The invention discloses a real-time streaming media transmission protocol stack in a multi-hop network. A packet control layer and an error control layer are added to an existing transmission control protocol (TCP) / internet protocol (IP) stack. The real-time streaming media transmission protocol stack in the multi-hop network has the advantages that an IP header and a TCP header are compressed by the packet control layer, and the obtained compressed headers reduce data redundancy; the compressed headers are subjected to broadcast channel (BCH) encoding, the encoded headers are uniformly distributed to data portions, the resistance to burst interference of the headers is improved, a receiver can obtain accurate header information through BCH decoding, thereby packet loss and retransmission are avoided, and time delay caused by retransmission is reduced; and a cyclic redundancy check (CRC) single bit error correction based reed-solomon (RS) errors-and-erasures correcting encoding and decoding scheme of the error control layer is utilized, the good communication effect can be guaranteed under the channel with short burst as a majority and accompanied with a small quantity of random errors, and the time delay is excellently controlled.

Description

technical field [0001] The invention relates to the field of network technology, in particular to a real-time streaming media transmission protocol stack in a multi-hop network. Background technique [0002] With the development of video coding technology, the improvement of network system and the enhancement of computing technology, digital multimedia services, especially video services, have gradually entered people's daily life, such as videophone, network chat, mobile video conferencing, wireless and Internet Video streaming HDTV broadcasting and more. Among them, the wireless network has occupied an increasingly important position in the field of video applications, and there is an application demand for wireless multi-hop networks, compared with traditional video transmission systems (such as ground, submarine cables, satellite TV, etc.) , the main characteristics of wireless network video communication are real-time bandwidth changes and relatively high (compared wit...

AI Technical Summary

Problems solved by technology

[0008] 1) In the existing TCP / IP protocol stack, the TCP header and the IP header occupy at least 40 bytes. Under the condition of low delay and short frame, the header redundancy overhead is too large, and the longer the header, the greater the probability of error ;

[0009] 2) Once the IP header is wrong, the 16-bit checksum in the IP header can be detected, which will cause packet loss, which will cause retransmission after the packet loss. Once the TCP header is wrong, the 16-bit checksum in the TCP header After detection, it will also lead to retransmission, which will increase the transmission delay;

[0010] 3) In each layer above the data link layer of the existing TCP / IP protocol stack, any error in the data will cause the entire datagram to be discarded, so a small amount of errors will also cause a large amount of valid data to be discarded, thereby causing a waste of resources

[0013] 1) The error correction effect on random errors is very poor;

[0014] 2) The decoding capability of the RS codeword cannot be fully utilized, because if the error position in the RS codeword can be obtained, the error correction capability will be doubled

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