Method for implementing error recovery in multicast service

Abstract

The invention provides a method for realizing error recovery in the multicast service, the concrete steps are as follows: a sending party firstly divides a multicast data package into data blocks, then the data blocks are orderly assigned to a receiving party in a multicast group, and returned response messages with lost messages are received; the sending party confirms the lost data blocks according to the received lost messages, confirms error recovery data blocks according to the lost data blocks, and assigns the error recovery data blocks to the receiving party in the multicast group; the receiving party of the lost data blocks in the multicast group obtains the lost data blocks according to the error recovery data blocks to realize the error recovery. The proposal of the invention can improve the error recovery efficiency of the receiving party, reduce the interaction times of the sending party and the receiving party, save network resources, restrain the retransmission and avoid the feedback storm.

Description

technical field [0001] The invention relates to multicast technology, in particular to a method for realizing error recovery in multicast business. Background technique [0002] In the multicast service, the sender needs to send the same service data to different receivers, that is, to all members in the multicast group. During the sending process, due to reasons such as links, the sent service data may be lost, that is, packet loss. In this case, the receiver cannot receive the service data correctly, which will seriously affect the realization of the multicast service. [0003] In order to control the impact of the packet loss phenomenon on the multicast service, an Automatic Repeat Request (ARQ, Automatic Repeat Request) method can be used for error recovery. [0004] ARQ error recovery techniques can be divided into global error recovery methods and error recovery methods based on local recovery groups. Among them, the general idea of ​​the global error recovery metho...

AI Technical Summary

Problems solved by technology

In this way, all receivers will feed back information to the sender for each sent data, which may cause a feedback storm and flood the multicast group

[0007] 2) Since the sender uses multicast to deliver the lost data, other receivers in the multicast group that have received it correctly will inevitably receive the data again, that is, repeated recovery, which not only wastes network and receiver resources, but also It is also easy to cause network congestion

[0008] 3) Since the sender can only send one lost data at a time, some receivers in the multicast group may not be able to quickly obtain the lost data, that is, they cannot quickly recover from errors, thus affecting the realization of multicast services

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