Method and system for locating mobile stations in a mobile communication network
First Claim
1. A method of locating mobile stations within a mobile communication network including a plurality of mobile stations and a plurality of base stations, the method comprising the steps of:
- performing measurements on signals communicated between at least three base stations and at least two mobile stations; and
locating the at least two mobile stations simultaneously using a number of equations, wherein the number of equations is (nm*nb+nm) if a round trip time (RTT), to transmit a signal from one base station to a mobile station and receive the transmitted signal back from the mobile station is known for at least two mobile stations, or the number of equations is (nm*nb) if the (RTT) for the one base station is not known for the at least two mobile stations,wherein nm is a number of mobile stations to be located and nb is a number of base stations involved in locating the nm mobile stations, andwherein each equation comprises the location of a mobile station as a function of the location of a base station and the performed signal measurements.
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Abstract
A method and system for locating mobile stations within a mobile communication network including at least two mobile stations and at least three base stations. Signal measurements are performed at the mobile stations and/or the base stations. Two or more mobile stations are located simultaneously by minimizing a cost-function, which is achieved by means of a sufficient number of equations, wherein the equations comprises the location of the mobile stations as a function of the location of one of the base stations in the network and the performed signal measurements.
39 Citations
22 Claims
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1. A method of locating mobile stations within a mobile communication network including a plurality of mobile stations and a plurality of base stations, the method comprising the steps of:
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performing measurements on signals communicated between at least three base stations and at least two mobile stations; and locating the at least two mobile stations simultaneously using a number of equations, wherein the number of equations is (nm*nb+nm) if a round trip time (RTT), to transmit a signal from one base station to a mobile station and receive the transmitted signal back from the mobile station is known for at least two mobile stations, or the number of equations is (nm*nb) if the (RTT) for the one base station is not known for the at least two mobile stations, wherein nm is a number of mobile stations to be located and nb is a number of base stations involved in locating the nm mobile stations, and wherein each equation comprises the location of a mobile station as a function of the location of a base station and the performed signal measurements. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for locating mobile stations within a mobile communication network including a plurality of mobile stations and a plurality of base stations, the system comprising:
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at least two mobile stations; at least three base stations; means for performing measurements on signals communicated between the at least three base stations and the at least two mobile stations; and means for locating the at least two mobile stations simultaneously using a number of equations, wherein the number of equations is (nm*nb+nm) if a round trip time (RTT), to transmit a signal from one base station to a mobile station and receive the transmitted signal back from the mobile station is known for at least two mobile stations, or the number of equations is (nm*nb) if the (RTT) for the one base station is not known for the at least two mobile stations, wherein nm is a number of mobile stations to be located and nb is a number of base stations involved in locating the nm mobile stations, and wherein each equation comprises the location of a mobile station as a function of the location of a base station and the performed signal measurements. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification