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Method and apparatus for reducing data packet retransmission times in reliable multicast transmission

A technology of retransmission times and data packets, which is applied in the field of data transmission, can solve the problems of multicast source and multicast transmission network load increase, multicast source and multicast transmission network have a very large impact, etc.

Active Publication Date: 2017-01-04
ZHEJIANG UNIVIEW TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above prior art solves the problem of packet loss of multicast data packets in the transmission process, when multiple multicast receiving devices receive multicast data streams, when the same multicast data packets are lost, each The multicast receiving device will send a retransmission request to the multicast source. At this time, the multicast data packet requested for retransmission is the same multicast data packet. The multicast source needs to retransmit the same multicast data packet multiple times, resulting in The load on the broadcast source and multicast transmission network increases, especially in the case of poor network quality, which has a great impact on the multicast source and multicast transmission network

Method used

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  • Method and apparatus for reducing data packet retransmission times in reliable multicast transmission
  • Method and apparatus for reducing data packet retransmission times in reliable multicast transmission
  • Method and apparatus for reducing data packet retransmission times in reliable multicast transmission

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Embodiment 1

[0039] In this embodiment, a method for reducing the number of data packet retransmissions in reliable multicast transmission is applied to multicast receiving equipment, such as figure 2 shown, including:

[0040] After detecting packet loss in the received multicast data, obtain the sequence number of the lost data packet;

[0041] Receive the retransmission request message sent by other multicast receiving devices, if the retransmission request message sent by other multicast receiving devices is not received within the preset delay sending time, send the lost data packet in multicast mode If the retransmission request message sent by other multicast receiving devices is received within the preset delay sending time, the retransmission request message carrying the retransmission request message not sent by other multicast receiving devices will be sent in multicast mode. A retransmission request message for the sequence number of the lost packet contained in the request m...

Embodiment 2

[0061] In this embodiment, a method for reducing the number of retransmissions of data packets in reliable multicast transmission is applied to a gateway router of a multicast receiving device, such as image 3 shown, including:

[0062] After receiving the retransmission request message sent by the multicast receiving device through multicast, it forwards the retransmission request message to other routers according to the normal multicast forwarding process, so that other routers forward the retransmission request message to other routers across the three-layer network. Multicast receiving equipment;

[0063] Determine whether the multicast tree where the device is located is a shortest path tree or a shared tree. If it is a shortest path tree, modify the destination IP address of the retransmission request message to the IP of the corresponding multicast source and send it to the multicast source. If it is a shared tree, then modify the source IP address of the retransmiss...

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Abstract

The invention discloses a method and apparatus for reducing data packet retransmission times in reliable multicast transmission. The method comprises the following steps: after packet loss of received reliable multicast data is detected, if retransmission request messages sent by other multicast receiving devices are not received within a delay transmission time, sending the retransmission request messages containing sequence numbers of all lost data packets through a multicast data packet, and if the retransmission request messages sent by the other multicast receiving devices are received within the delay transmission time, sending the retransmission request messages through the multicast data packet, wherein the sequence numbers of the lost data packets in the retransmission request messages do not contain the sequence numbers in the retransmission request messages sent by the other multicast receiving devices. The corresponding apparatus comprises a packet loss detection module and a retransmission request module. By adopting the method and apparatus disclosed by the invention, the data packet retransmission times in the reliable multicast transmission are greatly reduced, and the burden of a multicast source and a multicast transmission device is relieved.

Description

technical field [0001] The invention belongs to the field of data transmission, and in particular relates to a method and a device for reducing the number of data packet retransmissions in reliable multicast transmission. Background technique [0002] With the popularization of IP monitoring technology and the Internet, Internet access is becoming more and more convenient, and the global distribution of cross-regional branch offices and commercial groups increasingly requires remote Internet video monitoring. Network packet loss, out-of-sequence, and delay will cause serious consequences such as video freezes and blurred screens, affecting user experience. However, packet loss and out-of-sequence in a wide area network or wireless network are basically unavoidable. [0003] Multicast technology solves the problem of single-point transmission and multi-point reception of data packets, realizes efficient point-to-multipoint transmission of data packets in the IP network, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/08H04L12/18H04L29/06
CPCH04L1/08H04L12/185H04L69/164
Inventor 周迪关春天
Owner ZHEJIANG UNIVIEW TECH CO LTD
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