Determination of mobile station location

Details Determination of mobile station location Determination of mobile station location

2005-09-20

2005-09-20

Tran, CongVan (Department: 2683)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S437000, C455S067110

Reexamination Certificate

active

06947753

ABSTRACT:
A system, method and processing unit for mobile station location determination. Mobile Assisted Handoff (MAHO) measurements are sent to the processing unit that also retrieves the corresponding transmitted signal strengths and electromagnetic field distribution functions for the relevant base stations. The location of the mobile station is then determined by minimising the following formula:F⁡(γ,x,y)=∑j=1m⁢M⁡(PRj-γ·PTj·Gj⁡(x,y))where m is the number of relevant base stations, M is an optimisation metric (such as (εj)2or |εj|)PRjis received signal strength, PTjtransmitted signal strength, γ attenuation (e.g. in the mobile station), and Gj(x,y) the electromagnetic field distribution function.

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