Method for determining the position of a mobile station
First Claim
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1. A method for determining the location of a mobile station in a mobile radio communication system including a plurality of base stations, comprising:
- inducing the mobile station to transmit a locating signal containing a known bit sequence;
receiving said locating signal at a plurality of selected base stations in said mobile radio communication system;
determining the time of arrival of said locating signal at said selected base stations;
measuring the signal quality of said locating signal received at said selected base stations; and
calculating the position of the mobile station based on said time of arrival of said locating signal at said selected base stations, if said signal quality of said locating signal received at said selected base stations meets a desired signal quality.
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Abstract
The location of a mobile station in a mobile cellular communication system is determined by taking measurements of known transmissions from the mobile station at a plurality of base stations. The serving base station sends a control message to the mobile station to induce the mobile station to transmit a known bit sequence. The known bit sequence transmitted by the mobile station is received at a plurality of base stations. The time of arrival of the known bit sequence at each base station is determined and used to calculate the location of the mobile station.
34 Citations
32 Claims
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1. A method for determining the location of a mobile station in a mobile radio communication system including a plurality of base stations, comprising:
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inducing the mobile station to transmit a locating signal containing a known bit sequence;
receiving said locating signal at a plurality of selected base stations in said mobile radio communication system;
determining the time of arrival of said locating signal at said selected base stations;
measuring the signal quality of said locating signal received at said selected base stations; and
calculating the position of the mobile station based on said time of arrival of said locating signal at said selected base stations, if said signal quality of said locating signal received at said selected base stations meets a desired signal quality. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for determining the location of a mobile station in a mobile radio communication system including a plurality of base stations, comprising:
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a) inducing said mobile station to transmit a locating signal containing a known bit sequence;
b) receiving said locating signal at a plurality of selected base stations in said mobile radio communication system;
c) determining the time difference of arrival of said locating signal at said selected base stations, and d) calculating said location of said mobile station based on said time difference of arrival of said locating signal at said selected base stations. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 31, 32)
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22. A method for determining the location of a mobile station in a mobile radio communication system including a plurality of base stations, comprising:
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a) inducing the mobile station to transmit a locating signal containing a known bit sequence;
b) receiving said locating signal at a plurality of selected base stations in said mobile radio communication system;
c) determining the angle of arrival of said locating signal at said selected base stations; and
d) calculating the position of the mobile station based on said angle of arrival of said locating signal at said selected base stations. - View Dependent Claims (23, 24, 25, 26, 27, 28, 29, 30)
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Specification