Adaptive multimedia stream link transmission method

Abstract

The invention relates to an adaptive multimedia stream link transmission method. A server node automatically selects a unicast / multicast way to transmit data to a client node according to actually measured network traffic conditions. When network traffic is relatively higher / lower, a multicast / unicast way is adopted respectively. The network traffic is determined by periodically transmitting control information before the transmission of the data to monitor a service link number and the round trip time of the data from the server node to the client node in real time, and judging a magnitude relationship between bandwidth required by the client node and the residual bandwidth of the server node. In addition, the size of a data packet and corresponding retransmission and packet loss control mechanisms are also set. By the method provided by the invention, the unicast or multicast way can be adaptively selected according to the network traffic conditions to transmit the data, so the basic service requirements of a user may not be influenced and convenience can be brought to the addition of a multicast user into a multicast group when the network traffic is relatively higher, and resources in a network can be fully utilized when the network traffic is relatively lower.

Description

technical field [0001] The invention relates to a multimedia stream link transmission method, in particular to a method which can adaptively adopt unicast or multicast as a data transmission mode according to network flow conditions. Background technique [0002] With the development of network technology, unicast and multicast technologies have been greatly developed one after another, especially with the development of multimedia technology, the application range of streaming media technology is becoming wider and wider, such as network video conferencing, network live concerts , online distance learning, online real-time live broadcast, etc. [0003] Generally speaking, under the premise that the network bandwidth environment can meet the requirements of streaming media transmission indefinitely, there is no essential difference in transmission performance between unicast and multicast technologies, but for today's huge network user base, this ideal situation is basically...

AI Technical Summary

Problems solved by technology

When there are only one or two clients making requests to the same server, there may be no noticeable performance difference between the two; but when three to five clients make requests to the same server, the difference between the two will become At this time, the server that uses unicast to transmit data will obviously be unable to do what it wants, the phenomenon of packet loss and delay is relatively serious, and the video at the receiving end is obviously lagging and discontinuous; when more than five clients make service requests at the same time, It may cause a broadcast storm, and the entire network system is on the verge of collapse

[0004] Although the transmission speed of the multicast mode is faster when the network traffic is large, and it will not cause a rapid increase in the traffic in the network, however, since UDP is a connectionless and unreliable transport layer protocol, there is no congestion control, flow control and replay. transmission mechanism, and even if the transmission rate is reduced, the packet loss rate cannot be improved, so its reliability sometimes cannot meet the requirements

Images