Method of locating a mobile station
First Claim
1. In a cellular communication system having a plurality of base station radios and mobile stations, a method of estimating the location of a mobile station being served by a first base station radio with respect to other base station radios, the method comprising the steps of:
- a) transmitting a radio signal from said mobile station operating in said cellular communication system;
b) receiving said transmitted radio signal from said mobile station at said first base station radio and at a second base station radio and at any other base station radios operating in said cellular communications system within the propagation range of said mobile station;
c) measuring, for each received radio signal, radio propagation parameters associated with each of said base station radios;
d) operating on at least one of the measured propagation parameters of each base station radio, to form a location probability density function (pdf) expressed as ##EQU8## wherein k is a scaling constant, e is an error probability function, fi (r,θ
) is the signal propagation parameter function and fi0 is a measured propagation parameter of base station i and r is the distance from the base station to the mobile;
e) constructing a joint pdf by combining each individual pdf formed in step d;
f) estimating, with respect to said base station radios, the location of the mobile station in said cellular communication system using the resulting joint probability density function.
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Accused Products
Abstract
A method of providing an estimation of a mobile station'"'"'s location in a cellular communication system having a plurality of base stations and mobile stations is disclosed. The mobile station'"'"'s location is provided by measuring radio propagation parameters between the mobile station and each base station within propagation range of the mobile station. Then, a location probability density function (pdf) is found based on the measured radio propagation parameters. A joint probability density function (pdf) is then constructed by combining each individual function which is obtained. The location of the mobile station is then estimated from the resulting joint probability density function (pdf).
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Citations
14 Claims
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1. In a cellular communication system having a plurality of base station radios and mobile stations, a method of estimating the location of a mobile station being served by a first base station radio with respect to other base station radios, the method comprising the steps of:
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a) transmitting a radio signal from said mobile station operating in said cellular communication system; b) receiving said transmitted radio signal from said mobile station at said first base station radio and at a second base station radio and at any other base station radios operating in said cellular communications system within the propagation range of said mobile station; c) measuring, for each received radio signal, radio propagation parameters associated with each of said base station radios; d) operating on at least one of the measured propagation parameters of each base station radio, to form a location probability density function (pdf) expressed as ##EQU8## wherein k is a scaling constant, e is an error probability function, fi (r,θ
) is the signal propagation parameter function and fi0 is a measured propagation parameter of base station i and r is the distance from the base station to the mobile;e) constructing a joint pdf by combining each individual pdf formed in step d; f) estimating, with respect to said base station radios, the location of the mobile station in said cellular communication system using the resulting joint probability density function. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification