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Method for carrying out initial cell search first step by user terminal

A cell search and user terminal technology, which is applied in communication between multiple stations, electrical components, transmission systems, etc., can solve the problems of high power consumption and prolonged time of mobile phones, and achieve improved performance, accurate gain, and low correlation effect of complexity

Active Publication Date: 2010-07-21
XUANPU INDUSTRY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The purpose of this is to reduce the requirements for software / hardware processing power, but the price paid is the time it takes to perform the first step of the initial cell search
At the same time, with this method, the RF / ABB module needs to be turned on during the first step of the cell search, which consumes a lot of power for mobile phones.

Method used

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  • Method for carrying out initial cell search first step by user terminal
  • Method for carrying out initial cell search first step by user terminal
  • Method for carrying out initial cell search first step by user terminal

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Experimental program
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Embodiment Construction

[0055] pass below Figure 4 to Figure 5 A specific embodiment of the present invention is described in detail, so as to further understand the content of the present invention.

[0056] pass below Figure 5 A specific embodiment of the optimization method of the present invention is introduced in detail.

[0057] Step 1, clear the counters K, m, J used in the calculation process, and clear the memory used in the calculation process. The counter K is used for counting subframes, the counter m is used for counting time slices, and the counter J is used for counting the average subframe length.

[0058] Step 2, the user terminal (UE) receives the signal of the Kth subframe belonging to the mth time slot, and adds one to the counter K.

[0059] Step 3, the user terminal (UE) performs sliding correlation of the received signal of each subframe on all 32 downlink synchronization codes, and can obtain 32×6400×N÷M correlation results, where N is the oversampling rate of the input s...

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Abstract

The first step for searching initial subarea for user terminal comprises: dividing data of every subframe into M time slices; receiving signal of M time slices in some continual subframes respectively, taking slide correlation for received signal of every subframe opposite down synchronization code by turns, and accumulating the correlation results to obtain the maximum of correlation result for every time slice and opposite down synchronization code with correlation position; if corrected value of some time slice maximum more than set threshold, taking its opposite down synchronization code as the detected result of the first step; or else, comparing and finding out the max of M maximums to take its opposite down synchronization code as the detected result of the first step. This invention can reduce the search time and power consumption of user device greatly.

Description

[0001] This application is a divisional application, [0002] Original application number: 200510027739.2 [0003] Original filing date: July 14, 2005 [0004] Invention title of original application: Method for the first step of initial cell search in time division synchronous code division multiple access system technical field [0005] The present invention relates to a method applied to a wireless communication system, in particular to a method applied to a Time Division Synchronous Code-Division Multiple Access (TD-SCDMA) mobile communication system, where a user terminal performs an initial cell search The method of the first step (Initial CellSearch Stepl). Background technique [0006] In 1946, Bell Laboratories in the United States proposed to divide the service area of ​​mobile phones into several cells, and set up a base station in each cell to form a new concept of cellular (Cellular) mobile communication in a cellular system. In 1978, this system was successf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/707H04B7/26H04B1/7083
Inventor 叶远
Owner XUANPU INDUSTRY CO LTD