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Downlink multicast transmission method, server, terminal and readable storage medium

A transmission method and server technology, which are applied in the field of downlink multicast transmission methods, servers, terminals and readable storage media, can solve the problems of bundling and transmission of multicast IP packets and unicast IP packets, and reduce the packet loss rate. Effect

Active Publication Date: 2021-06-11
ACADEMY OF BROADCASTING SCI STATE ADMINISTATION OF PRESS PUBLICATION RADIO FILM & TELEVISION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, LLC frames can be carried in the TS stream, and then IP packets can be carried through LLC, but it is impossible to implement multicast IP packets and unicast IP packets on the DTMB (Digital Television Terrestrial Multimedia Broadcasting) channel. bundle transfer

Method used

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  • Downlink multicast transmission method, server, terminal and readable storage medium
  • Downlink multicast transmission method, server, terminal and readable storage medium
  • Downlink multicast transmission method, server, terminal and readable storage medium

Examples

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Embodiment 1

[0054] The first embodiment of the present invention provides a downlink multicast transmission method, which is applied to the server side, such as figure 1 As shown, the method includes:

[0055] Sending multicast LLC frames over the downlink broadcast link based on the pre-defined LLC frame format;

[0056] receiving the LLC multicast state control frame fed back by the terminal according to the frame loss situation of the multicast LLC frame;

[0057] Redundant retransmission is performed on the control frame through the unicast downlink transmission channel according to the LLC multicast state.

[0058] The embodiment of the present invention transmits the multicast LLC frame through the downlink broadcast link based on the pre-defined LLC frame format, realizes that the multicast IP group and the unicast IP group can be bundled and transmitted on the DTMB, and controls the frame according to the LLC multicast state Redundant retransmission is performed through the unic...

Embodiment 2

[0158] The second embodiment of the present invention provides a downlink multicast transmission method, such as image 3 As shown, applied to the terminal side, the method includes:

[0159] Receiving the multicast LLC frame sent by the server through the downlink broadcast link based on the pre-defined LLC frame format;

[0160] In the case of detecting that the multicast LLC frame has a frame loss, feed back an LLC multicast state control frame to the server;

[0161] Obtaining the LLC frame retransmitted by the server according to the LLC multicast state control frame through a unicast downlink transmission channel.

[0162] In the embodiment of the present invention, the receiving server sends the multicast LLC frame through the downlink broadcast link based on the pre-defined LLC frame format, and realizes that the multicast IP group and the unicast IP group can be bundled and transmitted on the DTMB, and can be obtained through the unicast downlink transmission channel...

no. 4 example

[0183] The fourth embodiment of the present invention proposes a downlink multicast transmission mechanism between a server and a multi-mode terminal:

[0184] The distribution and convergence server sends Ni multicast LLC frames with continuous sequence numbers each time through each downlink broadcast link, and Ni is greater than or equal to 5.

[0185] The multi-mode terminal extracts the LLC frame of the multicast service from the TS transmission packets corresponding to multiple downlink broadcast links, and realizes the LLC frame of the same multicast service by using the sequence number of the LLC frame through the sequence window and the sequence delay timer Submitted in sequence, the timer time of the sequence delay timer is α times the maximum value of the test round-trip delay RTT in multiple links.

[0186] When a multi-mode terminal receiving multicast services detects LLC frame loss, it will feed back the status of the multicast receiving window through the LLC m...

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Abstract

The invention discloses a downlink multicast transmission method, a server, a terminal and a readable storage medium. The method applied to a server side comprises the following steps: sending a multicast LLC frame through a downlink broadcast link based on a predefined LLC frame format; receiving an LLC multicast state control frame fed back by the terminal according to the frame loss condition of the multicast LLC frame; and performing redundant retransmission through a unicast downlink transmission channel according to the LLC multicast state control frame. According to the embodiment of the invention, the multicast LLC frame is sent through the downlink broadcast link based on the predefined LLC frame format, so that the multicast IP packet and the unicast IP packet can be bundled and transmitted on the DTMB, and the packet loss rate of the multicast service is reduced by performing redundant retransmission through the unicast downlink transmission channel according to the LLC multicast state control frame.

Description

technical field [0001] The invention relates to the technical field of digital television, in particular to a downlink multicast transmission method, a server, a terminal and a readable storage medium. Background technique [0002] In the prior art, LLC frames can be carried in the TS stream, and then IP packets can be carried through LLC, but it is impossible to implement multicast IP packets and unicast IP packets on the DTMB (Digital Television Terrestrial Multimedia Broadcasting) channel. Bundle transmission. Contents of the invention [0003] The embodiment of the present invention provides a downlink multicast transmission method, server, terminal and readable storage medium, which are used to realize that multicast IP packets and unicast IP packets can be bundled and transmitted on DTMB. [0004] In the first aspect, the embodiment of the present invention provides a downlink multicast transmission method, which is applied to the server side, and the method include...

Claims

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Application Information

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IPC IPC(8): H04L12/18H04L29/06H04L1/16H04L1/18
CPCH04L12/18H04L69/06H04L1/1607H04L1/1809Y02D30/70
Inventor 李继龙施玉海冯海亮张翀张帆
Owner ACADEMY OF BROADCASTING SCI STATE ADMINISTATION OF PRESS PUBLICATION RADIO FILM & TELEVISION
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