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Community Search first and second step serial iteration method for time-division duplexed system

A technology of time division duplex system and cell search, which is applied in communication between multiple stations, access restriction, electrical components, etc., and can solve problems such as errors, weak TD-SCDMA signal, and poor channel environment.

Active Publication Date: 2006-05-24
XUANPU INDUSTRY CO LTD
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Problems solved by technology

The so-called "error" situation here includes (1) the SYNC-DL code word or the corresponding frame synchronization position detected in the first step of the initial cell search is wrong; (2) the channel environment is too bad, that is, the signal-to-interference-noise ratio Too low; (3) There is no TD-SCDMA signal carrier on the input frequency point, or the TD-SCDMA signal is too weak

Method used

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  • Community Search first and second step serial iteration method for time-division duplexed system
  • Community Search first and second step serial iteration method for time-division duplexed system
  • Community Search first and second step serial iteration method for time-division duplexed system

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Embodiment Construction

[0033] based on the following Figure 3 ~ Figure 5 , to illustrate the preferred embodiment of the present invention.

[0034] Such as image 3 As shown, it is a flow chart of applying the present invention to a serial iterative method in the first and second steps of the initial cell search in the TD-SCDMA system.

[0035] First, in step 31, an iteration count counter is set to zero. An iteration count counter is maintained in the serial iteration process to count the number of iterations that have been performed, so it needs to be cleared to a zero value at the beginning of the iteration method.

[0036] Next, an iterative process is completed by steps 32 and 33, and the first step of initial cell search and the second step of initial cell search are executed respectively. Wherein, in step 32, the first step of initial cell search is performed to detect one or more SYNC-DL codewords and their synchronization positions. The first step of the initial cell search includes c...

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Abstract

The method includes steps: carrying out determination after executing second step of searching on initial sub zone; if certain condition is not satisfied; then returning back to first step for reexecuting search on initial sub zone so as to generate another SYNC-DL code words and relevant position of frame synchronization for second step of searching initial sub zone to detect; under low SNR, the method through serial iteration of the said first step and the second step accomplishes detection of frame synchronization and synchronization code word in higher probability of success and lower probability of false detection.

Description

technical field [0001] The present invention relates to a method for performing initial cell search (Initial Cell Search) by user terminal equipment in a time division duplex (Time Division Duplex) communication system, and in particular to a serial iteration of the first and second steps of cell search method. Background technique [0002] 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 successfully tested in Chicago, USA, and it was officially put into commercial use in 1983. The adoption of the cellular system enables the same frequency to be used repeatedly, thereby greatly increasing the capacity of the mobile communication system and meeting the objective needs of the sudden increase of mobile communication users. The development of cellular mo...

Claims

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Application Information

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IPC IPC(8): H04B7/26H04W48/16
Inventor 谢一宁冉晓龙
Owner XUANPU INDUSTRY CO LTD
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