Method and device for scheduling data in P2P (peer-to-peer) stream media system

Abstract

An embodiment of the invention discloses a method and a device for scheduling data in a P2P (peer-to-peer) stream media system. The method includes the steps: checking a play cache of a child node and judging whether the local play cache has packet loss or not by the child node; transmitting a packet loss request to a parent node with the maximum accumulated bandwidth and packet loss according to recorded one-byte information and recorded bandwidth by the child node if the local play cache has packet loss; transmitting a data packet to the child node according to the packet loss request by the parent node; and repairing the local play cache according to the data packet by the child node. By the aid of the method and the device, consumption of limited network bandwidth resources is reduced, the problems of too much start delay and excessive bandwidth resources due to exchange of mapping tables are solved, network load is reduced, the utilization rate of the network bandwidth resources is further increased, media playing delay is reduced, packet loss rate is decreased, and stream media can be played in a high-quality manner.

Description

Technical field [0001] The present invention relates to the technical field of streaming media transmission, in particular to a data scheduling method and device in a P2P streaming media system. Background technique [0002] With the rapid development of communication technology, people have higher and higher requirements for computer processing capabilities and network bandwidth resources. At the same time, the application of text information, audio and video information in the network has also been rapidly developed. Streaming media technology is mainly used in live video, on-demand systems, video conferencing, and distance education. Therefore, the transmission of streaming media data has high requirements for playback delay, bandwidth utilization, and packet loss rate. [0003] The data in the streaming media system has the characteristics of real-time, continuity and timing. Real-timeness means that the streaming media data transmitted in the network topology, especially in t...

AI Technical Summary

Problems solved by technology

For example, in the classic model DONet, in order to meet the data packets reaching the destination before the last broadcast deadline, the least block priority scheduling strategy is adopted to transmit rare data packets first. This least block priority scheduling algorithm cannot guarantee the orderly arrival of data packets, so It also cannot guarantee the continuous playback of child node media data

In addition, in order to reduce the overhead of exchanging control messages such as BM, the parent node usually waits until its BM reaches a considerable value before sending the BM corresponding to the data it holds to the child node, which undoubtedly increases the startup time of data scheduling. extend

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