Channelization code allocation method

A channelization code and distribution method technology, which is applied in the field of channelization code distribution, can solve problems such as easy interference and affect user communication quality, and achieve the effect of avoiding interference.

Inactive Publication Date: 2010-03-31
CHINA ACAD OF TELECOMM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0019] The purpose of the present invention is to provide a method for allocating channelization codes to solve the problem of interference between users at the edge of adjacent cells due to the correlation between composite codes in the prior art, thereby affecting the communication quality of users technical issues

Method used

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Embodiment Construction

[0041] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0042] see figure 1 , which is a schematic structural diagram of a TDD-SCDMA system. It includes RNC (Radio Network Controller), several NodeBs (base stations of cells) connected to RNC. Communication services can be provided for a very large number of users (UEs) in each cell.

[0043] Whenever a new user initiates a call request or a user switches from one cell to another, the RNC needs to allocate communication resources to the user. The resource includes channel information used by the user. During cell planning, the scrambling code corresponding to each cell has been determined, so during channel allocation, it mainly refers to the allocation of channelization codes.

[0044] see figure 2 , which is a channelization code allocation method of the present invention. it includes:

[0045]S110: Divide the composite code interference area of ​​each cell. The...

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Abstract

The invention discloses a channel code distributing method, which comprises the following steps: (1) dividing composite code interference region of each small region; (2) affirming the interference region of composite code corresponding to adjacent small region when user enters the interference region of composite code; finding the divided composite code of adjacent small region composite code interference region; selecting minimum interference channel code for the composite code; distributing the code to user. The invention makes user not apply greater interference composite code in the composite interference region, which avoids interference effect of composite code.

Description

technical field [0001] The invention relates to the communication field, in particular to a channelization code allocation method of a TD-SCDMA (time division-synchronous code division multiple access) communication system. 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 different code word usage and allocation schemes, as shown in Table 1. [0003] [0004] Table 1: Correspondence between different codewords [0005] After each downlink pilot code is determined, one of the four scrambling codes corresponding to each downlink pilot code can be selected as the scrambling code of the cell, and the corresponding basic midamble code can be determined according to Table 1. The midamble codes of different channels in the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04J13/02H04J13/16
Inventor 毛磊
Owner CHINA ACAD OF TELECOMM TECH
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