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Multimedia broadcast multicast data sending/receiving method, apparatus and system

A technology of multimedia broadcasting and multicasting data, which is applied to devices dedicated to receivers, digital transmission systems, store-and-forward switching systems, etc.

Inactive Publication Date: 2009-05-06
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] In the prior art, LDPC codes have not been used for MBMS service transmission, and the receivers with different channel environments can receive MBMS service data with lower receiving power

Method used

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  • Multimedia broadcast multicast data sending/receiving method, apparatus and system
  • Multimedia broadcast multicast data sending/receiving method, apparatus and system
  • Multimedia broadcast multicast data sending/receiving method, apparatus and system

Examples

Experimental program
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Effect test

Embodiment 1

[0054] The basic implementation principle is as follows: construct a first sparse matrix, which is called the base matrix for the convenience of description, so that the multimedia broadcast and multicast data encoded by the base matrix can be correctly decoded by the receiving end with a good channel environment; by expanding the base matrix , to generate a second sparse matrix, which is called an enhanced parity check matrix for convenience of description. For a receiving end with a poor channel environment, it decodes after receiving all the information encoded according to the enhanced parity check matrix, and obtains the transmission data of the MBMS service.

[0055] For specific steps, see figure 2 ,include:

[0056] Step S101. Construct a first sparse matrix (base matrix) with M rows and N columns, so that the multimedia broadcast multicast data encoded by the base matrix can be correctly decoded by the receiving end with a good channel environment.

[0057] The spec...

Embodiment 2

[0086] The basic implementation principle is as follows: construct a sparse matrix, which is called the third sparse matrix for the convenience of description, so that the multimedia broadcast multicast data encoded by the third sparse matrix can be correctly decoded by the receiving end with poor channel environment; The matrix performs LDPC encoding on the multimedia broadcast and multicast data, and divides the encoded service data into first information and second information for transmission, wherein the first information is part of the encoded service data bits, and the receiving end with a good channel environment , it can be correctly decoded only by receiving the first information, and the transmission data of the MBMS service can be obtained.

[0087] Figure 5 The flow chart of the steps for sending the MBMS service data at the sending end provided in Embodiment 2 of the present invention specifically includes:

[0088] Step S401, constructing a third sparse matrix...

Embodiment 3

[0103] Figure 6 The flow chart of the receiving end receiving MBMS service data steps provided by Embodiment 3 of the present invention; specifically includes:

[0104] Step S501, the receiving end judges the quality of the channel environment where it is currently located.

[0105] In this step S501, the channel environment quality can be characterized by various parameters. For example, the signal-to-noise ratio (SNR) can be used to characterize the channel environment quality. When the receiving end judges that the current SNR is greater than the set threshold, it is determined that the channel environment quality is good; when the SNR is less than or equal to the set threshold, it is determined as the channel environment quality. Difference.

[0106] When the receiving end judges that the quality of the channel environment it is currently in is good, adopt the first receiving strategy and perform the following step S502;

[0107] When the receiving end judges that the ...

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Abstract

The invention discloses a multimedia broadcast / multicast data transmitting / receiving method, a device and a system. The method comprises the following steps: the multimedia broadcast / multicast data are decoded by low-density parity check codes (LDPC); service data after being decoded can be divided into first information and second information, and then the first information and the second information are transmitted; a receiving terminal judges the environmental quality of a signal path where the receiving end is located; when the environmental quality of the signal path is good, only the first information can be received; while the environmental quality of the signal path is poor, both the first information and the second information can be received. According to different signal path environment where the receiving terminal is located, the receiving terminal can achieve the purpose by adopting the invention that the MBMS service data can be received with lower receiving power while ensuring the received service data quality.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a multimedia broadcast multicast data sending method, a receiving method, and a corresponding device and system. Background technique [0002] One of the main characteristics of various mobile packet services, including video on demand, TV broadcasting, video conferencing, online education, and interactive games, is that multiple users who subscribe to the service receive the same data at the same time, and this type of service is different from general Compared with data, it often has the characteristics of many concurrent users, large data volume, long duration, and delay sensitivity. Apparently, it is very inefficient to use the common point-to-point transmission method for this kind of business, which is very inefficient for the resource-short mobile communication network. For this reason, in many communication systems, a multimedia broadcast and multicast service (Mult...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04W4/00H04L12/18H04L12/54
CPCH03M13/6393H04L1/0045H04L1/0036H03M13/1102H03M13/6306
Inventor 余荣道李琦
Owner HUAWEI TECH CO LTD
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