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Channel code mapping method of down going sharing channels in broadband CDMA system

A wideband code division multiple access, shared channel technology, applied in code division multiplexing systems, multiplexing communications, electrical components and other directions, can solve the problem of no specified channel code mapping implementation method, etc., to maintain fairness , high throughput and capacity, and the effect of improving utilization efficiency

Inactive Publication Date: 2010-04-14
HUAWEI TECH CO LTD
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Problems solved by technology

[0011] In practical application, the above scheme has the following problems: In the existing WCDMA protocol specifications, only the expression method of channel code mapping is specified, but the specific implementation method of channel code mapping is not specified
Since most of the channel code mapping implementations for WCDMA systems are still in the research and development stage, there is currently no method for implementing code word mapping published in open papers or journals

Method used

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  • Channel code mapping method of down going sharing channels in broadband CDMA system
  • Channel code mapping method of down going sharing channels in broadband CDMA system
  • Channel code mapping method of down going sharing channels in broadband CDMA system

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Embodiment Construction

[0038] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0039] The present invention realizes the channel code mapping method of the downlink shared channel in the WCDMA system based on the principle of minimum channel code multiplexing, ensures fairness between different users while making full use of channel code resources, and realizes the maximum throughput rate of the system. The basic idea of ​​the present invention is to describe the multiplexing degree of the user to the channel code by the channel code multiplexing coefficient, and when a TFC is mapped to a spreading code with a certain size spreading factor in the code tree, from the candidate code Among the words, the codeword with the minimum degree of multiplexing is selected. The present invention uses the channel code multiplexing coefficient to represen...

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Abstract

The disclosed method includes following steps: (1) calculating magnitude of spread spectrum factor needed for each combination of transmission format in users' combination of transmission format; (2)obtaining minimal spread spectrum factor needed by user based on calculated result; (3) selecting branch in lowest extent for multiplexing root node in code tree assigned for shared channel; (4) in selected branches, mapping each user's combination of transmission format to suitable channel code. The WCDMA system is capable of implementing mapping channel codes for down going sharing channels, taking full advantage of resources of channel codes, ensuring fairness among different users, and realizing maximal throughput of system.

Description

technical field [0001] The invention relates to a code word mapping method in a code division multiple access system, in particular to a channel code mapping method of a downlink channel. Background technique [0002] The third-generation mobile communication system is based on the Code Division Multiple Access (CDMA for short) technology, and data needs to be spread-spectrum-processed on the physical channel. Wideband Code Division Multiple Access ("WCDMA") is one of the three mainstream standards of the third generation mobile communication (the 3rd Generation, "3G"). It inherits the existing global mobile communication The Global Systems for Mobile communications ("GSM") system (Global Systems for Mobile communications, referred to as "GSM") has the characteristics of high standardization and good openness, and has good compatibility and interoperability with the GSM network. It is one of the development trends of mobile communications in the future. [0003] In the WCDM...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J13/02
Inventor 张静荣
Owner HUAWEI TECH CO LTD
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