Data retransmission method, system, multicast server and user terminal

Abstract

The embodiment of the invention provides a data retransmission method, a system, a multicast server and a user terminal. The method comprises the following steps of: receiving a single-cast retransmission request sent by a first multicast member in a first multicast group to retransmit a first data packet; determining whether the number of single-cast retransmission requests received by the first multicast member in the first multicast group to transmit the first data packet is more than or equal to the preset threshold or not; and after the number is determined to be more than or equal to the preset threshold, multicasting the first data packet to the multicast members in the first multicast group, and carrying out no response to the single-cast retransmission requests received by the multicast members in the first multicast group to retransmit the first data packet within the first preset period. By adopting the technical scheme, the load on the server can be reduced, and the probability of traffic congestion in the downlink network can also be reduced.

Description

technical field [0001] The present invention relates to video communication technology, in particular to a data retransmission method, system, multicast server and user terminal. Background technique [0002] With the development of the communication industry, the application of Internet TV (English full name is Internet Protocol Television, English abbreviation is IPTV) service is more and more extensive. IPTV services, especially broadcast television (English full name is Broadcast Television, English abbreviation is BTV) services, have higher requirements on the quality of the network, and generally require a packet loss rate of less than 10 -7 . Packet loss has a sharp impact on video. Packet loss detection and packet loss retransmission are currently feasible solutions to this problem. [0003] The process of packet loss retransmission includes: when packet loss occurs in the network, the user terminal will send a packet loss retransmission request to the video qualit...

AI Technical Summary

Problems solved by technology

[0004] Usually, a VQE server will host thousands of user terminals. If a large number of user terminals send packet loss and retransmission requests for the same video message to the VQE server, the VQE server must respond to these packet loss and retransmission requests in unicast mode. Sending the same video packets to these different user terminals separately not only increases the burden on the VQE server, but also may cause traffic congestion on the downlink network

Images