Automatic retransmission request mechanism suitable for mobile stream media application

Abstract

The invention discloses an automatic retransmission request mechanism applicable to mobile streaming media. The invention is applied to solve the problem that present automatic retransmission request mechanism inapplicable to mobile streaming media due to the long time delay. The automatic retransmission request mechanism applicable to mobile streaming media application includes: (1) the sending terminal adds sequence numbers to each data packet according to the playing sequence and then sends the data packet to the receiving terminal; (2) the receiving terminal controls retransmission according to the sequence number intervals of the received data packet. The retransmission is controlled as follows: when the sequence number intervals of the received data packets are detected, the receiving terminal will request the retransmission buffer zone of the sending terminal to retransmit the data packets with the sequence number intervals. By applying the method to detect loss of data packets, the fast detection of data packet loss is achieved, as only intervals between sequence numbers need detecting, and thereby the retransmission time delay is shortened. The automatic retransmission request mechanism applicable to mobile streaming media is mainly applied in video streaming playing of mobile streaming media.

Description

technical field [0001] The present invention relates to an automatic repeat request (ARQ: Automatic Repeat Request) mechanism, in particular to an automatic repeat request mechanism applied in mobile streaming media. Background technique [0002] With the rapid development of mobile communication, people are no longer satisfied with obtaining individual text, sound or image information, but hope to obtain streaming media information including text, sound, image and video at the same time. The third generation mobile communication network (3G) not only inherits the time division multiple access (TDMA) technology, but also develops a series of new code division multiple access (CDMA) technologies, making the 3G mobile network capable of high-speed data transmission. ability to meet people's growing demand for streaming media information. According to the definition of the International Telecommunication Union (ITU), a 3G network should have a data transmission capability of a...

AI Technical Summary

Problems solved by technology

However, this traditional ARQ mechanism has too long a delay in confirming data packets, which does not meet the real-time requirements of mobile streaming media, and the wireless channel itself has a high bit error rate. If the ACK response packet itself is lost, the traditional ARQ The ARQ mechanism does not take a good mechanism to deal with this situation. Furthermore, the traditional ARQ mechanism does not control the capacity of data packets in the buffer of the client, and cannot coordinate the relationship between the possibility of recovering lost packets and the transmission rate, and cannot maintain a relatively high transmission rate. High probability of lost packet recovery

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