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Method for improving ultilization ratio of orthogonal variable extended frequency factor code tree

A spreading factor and utilization rate technology, which is applied in the field of improving the utilization rate of orthogonal variable spreading factor code tree

Active Publication Date: 2010-09-22
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012]Currently in the WCDMA system, the channel code resource management scheme only pays attention to the codeword allocation algorithm, but does not consider how to deal with the codeword fragments in the OVSF code tree. Therefore, the utilization rate of the OVSF code tree cannot reach the ideal level.

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  • Method for improving ultilization ratio of orthogonal variable extended frequency factor code tree
  • Method for improving ultilization ratio of orthogonal variable extended frequency factor code tree
  • Method for improving ultilization ratio of orthogonal variable extended frequency factor code tree

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Embodiment Construction

[0041] The method for improving the utilization rate of the orthogonal variable spreading factor code tree in the present invention is aimed at the random access of users in the cell and the randomness of the access user's duration in the cell in the prior art, which will cause the OVSF of the cell In the code tree, codeword fragments that cannot be merged with occupied sibling codewords to become the parent code under the upper-level spreading factor SF will reduce the utilization rate of the OVSF code tree, and a corresponding codeword fragment search is proposed Processing, the processing of measuring the severity of OVSF code tree fragments and the processing of reorganizing the code word fragments so that the code word fragments on the OVSF code tree can be merged into code words with a smaller spreading factor SF to further improve the OVSF code tree utilization.

[0042] The most typical field of application of the method that the present invention improves the utilizat...

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Abstract

This invention discloses a method for increasing the usability of an orthogonal variable spread spectrum factor code tree including searching for the occupied distributable code words of the brother code words under each stage of spread spectrum factors in the code tree as the code word fragments, processing each pair of fragments as follows: re-configuring users occupying brother code words of the first fragment in said pair of fragments into a second code word fragment in it and merging the brother code words of the first fragment released by the user and said first fragment to code words of the upper stage spread spectrum factors, which can merge the code word fragments in the OVSF code tree to father codes with less spread spectrum factors to further increase the usability of OVSF code tree.

Description

technical field [0001] The present invention relates to the technical field of Wideband Code Division Multiple Access (WCDMA, Wideband Code Division Multiple Access) mobile communication, in particular to a method for improving the utilization rate of Orthogonal Variable Spreading Factor codes (OVSF, Orthogonal Variable Spreading Factor codes) code tree . Background technique [0002] Since the WCDMA system is a code division multiple access system, the downlink physical channels of the cells in this system are distinguished by their respective downlink channel codes, which requires that the downlink channel codes used by different physical channels in the cell be kept consistent. While ensuring the orthogonality between the downlink channel codes used by different physical channels, it is also necessary to meet the requirements of different services for different QoS, that is, the downlink physical channels are required to be able to provide variable data transmission rates...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J13/02H04J13/20
Inventor 陈运涛
Owner HUAWEI TECH CO LTD