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Method for planning code word in sector of TD-SCDMA system

A synchronous code division multiple access and cell code technology, applied in the direction of code division multiplexing system, transmission system, communication between multiple stations, etc., can solve problems such as network performance deterioration, reduce impact and reduce interference Influence and improve the effect of overall anti-interference ability

Inactive Publication Date: 2006-02-01
CHINA ACAD OF TELECOMM TECH
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  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned cell codeword planning does not fully consider the interference effect caused by the correlation change between composite codes, which may lead to deterioration of network performance. Therefore, the existing TD-SCDMA system cell codeword planning method cannot be well applied to Network Planning of TD-SCDMA System

Method used

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  • Method for planning code word in sector of TD-SCDMA system
  • Method for planning code word in sector of TD-SCDMA system
  • Method for planning code word in sector of TD-SCDMA system

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Embodiment Construction

[0027] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0028] see figure 1 , which is a flow chart of cell code word planning in a time division-synchronous code division multiple access system of the present invention. The method includes the following steps:

[0029] First perform step S110: calculate and save the degree of interference between each scrambling code group in the 32 groups of scrambling code groups and each other scrambling code group, the interference degree represents the mutual correlation between any two scrambling code groups; where , the strength of cross-correlation is represented by the cross-correlation value between two scrambling code groups. The larger the cross-correlation value is, the greater the cross-correlation between two scrambling code groups is. The smaller the cross-correlation between groups, how to calculate the cross-correlation value between two scrambling code groups will be...

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Abstract

The method includes steps: (1) calculating and storing degree of interference between each scrambling code group in all scrambling code groups and other each scrambling code group; the degree of interference indicates degree of crosscorrelation between two scrambling code groups; (2) finding out assignment of sector scrambling code group with minimal total degree of interference in TD-SCDMA system; (3) based on coincidence relation between scrambling code group and down going pilot frequency code, through assigned scrambling code group for each sector, determining down going pilot frequency code for own sector, and selecting a scrambling code for own sector. Considering disturbed condition caused from relativity between composite codes, the invention raises interference killing feature of system and lowers influence on capacity of TD-SCDMA system from interference between codes in same frequency in network.

Description

technical field [0001] The invention relates to a method for allocating codewords in a code division multiple access (CDMA) mobile communication system, in particular to a codeword planning method for time division-synchronous code division multiple access (TD-SCDMA) system cells during network planning. Background technique [0002] The third-generation mobile communication system widely adopts the multiple access method based on CDMA, and its basic feature is to distinguish different users with different code words. In order to realize the cellular network structure, different CDMA systems have defined their own different code word usage and allocation schemes. [0003] Among them, the codes used in the TD-SCDMA system can be divided into types according to types: downlink pilot code, uplink pilot code, cell scrambling code, training sequence (midamble code) and spreading code. Refer to Table 1 for the correspondence between downlink pilot codes, uplink pilot codes, scram...

Claims

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Application Information

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IPC IPC(8): H04J13/02H04B1/69H04B7/26H04B1/7103
Inventor 李娟李峻
Owner CHINA ACAD OF TELECOMM TECH