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Full frequency band frequency point scanning method of time-division-synchronization code multi-address division system

A technology of synchronous code division multiple access and scanning method, which is applied in the field of full-band frequency point scanning of time division-synchronous code division multiple access system, and can solve the problem of low power measurement value, unreasonable AGC adjustment method, and unreasonable sorting of candidate frequency points. and other problems to achieve the effect of accurate search

Active Publication Date: 2008-01-09
SPREADTRUM COMM (SHANGHAI) CO LTD
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AI Technical Summary

Problems solved by technology

In fact, no matter which of the above methods is used, it cannot effectively reflect the strength of the useful signal (signal in the system) at the frequency point. When the channel environment is poor, due to the influence of strong noise and strong interference, the correct frequency point is often The power measurement value at the location is low, and cannot be ranked in the top position in the measurement results, which significantly prolongs the time for the UE to log in to the serving cell
[0015] 2. The adjustment method of AGC is unreasonable
[0017] 3. The ordering of candidate frequency points is unreasonable
[0018] Due to the inaccuracy of power measurement and AGC adjustment, it is obviously unreasonable to simply sort the power measurement results in descending order to obtain a list of candidate frequencies

Method used

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  • Full frequency band frequency point scanning method of time-division-synchronization code multi-address division system
  • Full frequency band frequency point scanning method of time-division-synchronization code multi-address division system
  • Full frequency band frequency point scanning method of time-division-synchronization code multi-address division system

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Embodiment Construction

[0075] In this embodiment, the frequency deviation between the UE and the base station in the cell is 6 kHz, the channel environment is the Case3 channel specified in the standard 3GPPTS 25.102, and the signal-to-noise ratio is -2 dB. The working frequency of the base station in the serving cell is 2012.2MHz. Except for the TS0 time slot and DwPTS in the subframe signal of the base station, the other time slots have no information. There are two other adjacent base station interference signals, the operating frequency points are 2018.6MHz and 2022.4MHz respectively, and the signals of the two base stations have been beam-formed in the direction of the UE. For the UE, the service slot power of the interfering cell is significantly It is stronger than the broadcast channel power of the cell base station where the UE is located.

[0076] The specific steps of this embodiment include:

[0077] A, according to predetermined frequency interval and measurement frame number, carry ou...

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Abstract

The invention is concerned with the point frequency scanning method of mobile terminal frequency segment to perform under interference environment of all sorts. It applies the low connection filtering method to eliminate the disturbance of the signal incept power volume by noise and the channel fading, directs the adjustment of the point frequency AGC and the frequency power measurement with different reference guide line separately, and conducts fitting and smoothing treatment to all the frequency section measuring volume data, and finally, generates the candidate frequency list by applying the method of power section peak value selection.

Description

technical field [0001] The invention relates to a scanning method for realizing full frequency band frequency points in a mobile communication system, in particular to a scanning method for realizing full frequency band frequency points in a time division-synchronous code division multiple access wireless communication system (abbreviated as TD-SCDMA system). By adopting the whole frequency band scanning method of the present invention, the purpose of terminal searching for the working frequency point of the serving base station in the TD-SCDMA system can be quickly and accurately realized in the environment of low signal-to-noise ratio and strong interference. Background technique [0002] The frequency point scanning of mobile communication system terminals (referred to as UE) means that when the UE is turned on or loses network coverage, the UE tries to obtain information within its receiving frequency range without prior information on the cell of the serving base station...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04B1/707H04B7/005H04J13/02H04B17/00H04B17/309H04W48/16
Inventor 谭舒申敏王茜竹郑建宏
Owner SPREADTRUM COMM (SHANGHAI) CO LTD
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