Multipath searching method in code division multiple access system and device thereof

A multi-path search and code division multiple access technology, applied in the field of multi-path search, can solve problems affecting search performance, multiple search resources, consumption, etc., and achieve the effects of saving search resources, ensuring stability, and reducing the impact of noise paths

Inactive Publication Date: 2013-05-08
ZTE CORP
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Problems solved by technology

[0009] 1) When the cell radius is large, it is necessary to divide the cell radius into multiple areas and perform multiple searches, which consumes more search resources
[0010] 2) Determining the position of the search window only based on the position of the maximum diameter will cause frequent window adjustments, which will affect the search performance, and will affect the accuracy of the search window position when there is a false path

Method used

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  • Multipath searching method in code division multiple access system and device thereof
  • Multipath searching method in code division multiple access system and device thereof
  • Multipath searching method in code division multiple access system and device thereof

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Embodiment Construction

[0033] Below, refer to the attached Figure 1~3 The method and device for multipath search in the code division multiple access system of the present invention are described in detail.

[0034] Based on the above discussion, the present invention proposes a new search method without PD parameters. Firstly, search is performed within the entire cell range, and the width of the search window needs to cover the maximum radio wave transmission delay, which can be called an initial wide search. After the physical layer of the wireless link is synchronized or the initial wide search stably searches the multipath position, it will switch to a search with a narrower search window width, which can be called a regular search. Considering the limitation of search resources, the width of the conventional search window is relatively narrow, and it only needs to be able to cover the delay extension of multipath in most scenarios.

[0035] When the initial wide search is converted to regul...

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Abstract

The invention provides a multipath searching method in a code division multiple access system and a device thereof, wherein the device comprises an initial width searching unit and a conventional searching unit, wherein the initial width searching unit comprises a searching window switching module which is used for judging whether the multipath information searched by initial width meets the condition needed by converting initial width searching into conventional searching; if yes, the initial width searching is stopped and converted into the conventional searching; and if not, the initial width searching is continuously carried out. The invention saves searching resources and ensures the stability and the accuracy when a searching window is switched.

Description

technical field [0001] The invention relates to the technical field of wireless communication, in particular to a method and device for multipath search in a code division multiple access system. Background technique [0002] In a direct spread spectrum code division multiple access system, when a user terminal (User Equipment, UE) initiates access to a base station, the UE first sends a preamble (Preamble) to the base station, and the base station searches the preamble to obtain The radio wave transmission delay (PropagationDelay, PD) caused by the distance between them. The PD parameters will be passed down through the NBAP (Node B Application Part) signaling of the IUB interface. If the base station can obtain the PD parameters, the position of the regular search window of the dedicated channel can be determined according to the parameters; if the base station cannot obtain the PD parameters, the new wireless As far as links are concerned, conventional searches cannot be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04B1/7113
Inventor 闫晓伟
Owner ZTE CORP
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