Method for positioning mobile station and positioning auxiliary device for realizing said method

Abstract

The method comprises: using a repeater coupled-to/integrated-in a location assistant function (LAF) unit as the location assistant device; the network side of the location system can either get TDOA (the time difference of arrival) corresponding to the pilot frequency signal from base station and the TDOA corresponding to the pilot frequency signal of the base station through the repeater, and or get the TDOA corresponding to the pilot frequency signal of LAF unit in the location apparatus; it uses the TDOA corresponding to the pilot frequency of LAF unit and the parameter information of the repeater predetermined at network to abandon the TDOA corresponding to the pilot frequency signals from base station through the repeater, and uses the rest TDOA-namely the TDOA corresponding to the pilot frequency signals from base station and the TDOA corresponding to the pilot frequency signals from LAF unit to make location calculation for the mobile station.

Description

technical field [0001] The invention relates to positioning technology, in particular to a method for locating a mobile station (MS, Mobile Station) in a code division multiple access (CDMA) system and a positioning auxiliary device for realizing the method. Background technique [0002] The positioning service is an important service in the wireless cellular communication system. In the CDMA system, the commonly used mobile station positioning methods include Assisted Global Positioning System (A-GPS) positioning, advanced forward link triangulation (AFLT), enhanced Type Forward Link Triangulation (EFLT), Cell Location (Cell_ID), etc. Among them, the AFLT and EFLT positioning technologies perform positioning by measuring the wireless signal propagation time or time difference between the mobile station and the base station. This positioning method can also be called Time of Arrival (TOA) or Time Difference of Arrival (TDOA) positioning. The characteristics of TOA / TDOA posi...

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Problems solved by technology

[0007] 1) When the mobile station is far away from the base station, even if the TOA does not pass through the repeater, the measured TOA will be large; or when the repeater is very close to the base station, and the forwarding delay of the repeater is small, even if the TOA After passing through the repeater, the measured TOA will be very small, resulting in a very high probability of misjudgment, resulting in misjudgment;

[0008] 2) The cell marking method cannot use the location information of the repeater for positioning. When there are many repeaters, all TOA / TDOA may have passed through the repeater, so TOA / TDOA cannot be used for positioning, and TOA / TDOA cannot be performed position

[0010] From the point of view of the existing elimination of the impact of repeaters on TOA / TDOA positioning accuracy, the cell marking method cannot really eliminate the negative impact of repeaters on TOA / TDOA positioning. When there are repeaters, TOA / TDOA is still reduced Positioning accuracy; while the watermarking method is complicated to implement, the design of the mobile station needs to be modified to support the detection of the watermark of the repeater. In addition, the watermark of the repeater will interfere with the CDMA signal

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