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Multicast method, device and system

A technology of receiving equipment and sending equipment, which is applied in the field of data transmission, can solve problems such as inability to guarantee performance and affect multicast transmission efficiency, and achieve the effect of improving performance and improving multicast transmission efficiency

Active Publication Date: 2013-09-11
HUAWEI TECH CO LTD
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Problems solved by technology

However, for different code rates, the optimal degree distribution obtained under a given code rate cannot guarantee the performance of approaching capacity, which will affect the transmission efficiency of multicast

Method used

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  • Multicast method, device and system
  • Multicast method, device and system
  • Multicast method, device and system

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Embodiment Construction

[0031] In order to enable those skilled in the art to better understand the solutions of the embodiments of the present invention, the embodiments of the present invention will be further described in detail below in conjunction with the drawings and implementations.

[0032] Such as figure 2 Shown is the flowchart of the multicast method of the embodiment of the present invention, including the following steps:

[0033] Step 201, after receiving the same service request sent by multiple receiving devices, the sending device selects a plurality of optimal degree distributions and encoding methods corresponding to different code rates;

[0034] When selecting a plurality of optimal degree distributions and encoding methods corresponding to different code rates, multiple optimal degree distributions and encoding methods corresponding to different code rates may be selected according to the channel quality of the multiple receiving devices; or It is to select a plurality of opt...

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Abstract

A multicast method, device and system are disclosed. The method includes the following steps: When a sending device receives the same service requests sent by a plurality of receiving devices, a plurality of optimal degree distributions and coding modes corresponding to different code rates respectively are chosen. Multicast information is encoded using the chosen optimal degree distributions and coding modes corresponding to different code rates in turn, and then sent.

Description

technical field [0001] The invention relates to data transmission technology, in particular to a multicast method, device and system. Background technique [0002] RC (Rateless Code, rateless code) has been applied in P2P (Peer to Peer, point-to-point) communication and satellite communication because of its simplicity and high performance. In a multicast / broadcast system, RC is mainly used at the service level, and the object of processing is data packets. [0003] The current technology for transmitting information at the bit level is to use a fixed code rate for information transmission. Self-adaptation is based on the mother code with a fixed code rate (such as Turbo code) to obtain a high code rate channel code by puncturing. Channel coding with a low code rate is obtained. Although the mother code with a given code rate (such as the Turbo code with a given code rate of 1 / 3 in 3GPP) has very good performance and can approach the capacity limit, due to puncturing, it c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L1/00
CPCH04L2001/0093H04L1/0009H04L1/0019
Inventor 陈大庚王艺
Owner HUAWEI TECH CO LTD
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