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Method for positioning user device at soft changing state

A technology of user equipment and positioning method, which is applied in the direction of location information-based service, multiplexing communication, code division multiplexing system, etc., and can solve the problem of low accuracy

Inactive Publication Date: 2004-04-14
ZTE CORP
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AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the disadvantages of low accuracy of UE positioning results in the soft handover state by using the determination of the active centralized reference cell as stipulated in the existing 3GPP protocol, and propose a method of positioning UE with higher accuracy by narrowing the UE location area in the reference cell method

Method used

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  • Method for positioning user device at soft changing state
  • Method for positioning user device at soft changing state
  • Method for positioning user device at soft changing state

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] The present invention is based on the following facts: for the UE in the soft handover state, its position actually falls in the overlapping area of ​​adjacent cells and its vicinity, so a part of the entire reference cell can be drawn as the positioning result, and the range is reduced to improve the positioning accuracy . There are two preconditions in the present invention: (1) A certain cell in the active set of the UE has been determined as the reference cell to be used for the positioning result. (2) Descriptive parameters such as cell antenna position coordinates, cell type, and area range need to be known, which can be provided by the database after the network planning is completed.

[0029] figure 1 It is a schematic diagram of the positioning results of the omni-directional cell and the directional cell obtained by the CI p...

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Abstract

The method includes following steps. (1) Determining central coordinate of each subzone in activation set. (2) Making out straight lines perpendicular to connecting lines between center of reference subzone and each center of adjacent subzones as well as passing through center of reference subzone, and areas enclosed by said straight lines and borderline of the reference subzone are selected as direction areas, if the said enclosed areas are near to adjacent subzones. (3) Based on positioning method, positioning result of UE in reference subzone is obtained. (4) Superposed areas between direction areas obtained from step (2) and positioning result obtained from step (3) are as final positioning result for UE. Comparing with prior art, the invention raises precision of positioning UE, simple without complex calculation, and not affecting time for obtaining result by using RNC.

Description

technical field [0001] The present invention relates to a mobile positioning method for determining the position of a user equipment (User Equipment, UE), and in particular to a mobile positioning method for a UE in a wideband code division multiple access (WCDMA) cellular mobile communication system when the UE is in a soft handover state. The method for positioning. technical background [0002] In recent years, mobile communication has developed rapidly, especially digital cellular mobile communication. In the late 1990s, second-generation mobile communication systems such as GSM (Global System for Mobilecommunication, Global Communications) digital cellular mobile communication systems and narrowband CDMA (Code Division Multiplex Access, Code Division Multiple Access) cellular mobile communication systems were widely used worldwide. Application, in order to solve the problems existing in the second generation mobile communication system, ITU is promoting the third gener...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W4/02H04B7/26H04J13/00H04W36/18
Inventor 王磊李春艳
Owner ZTE CORP
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