Method and apparatus for detecting excess delay in a communication signal
First Claim
1. A method of determining location of a mobile unit, the method comprising:
- receiving signals from at least two base stations;
determining a time difference of arrival between the received signals;
estimating a lower bound of excess delay in accordance with the time of arrival of the signals and known distances between the base stations, wherein estimating the lower bound of excess delay is done with less than all of the signals received from the base stations; and
estimating a location of the mobile unit in accordance with the estimated lower bound of excess delay and the time difference of arrival between the received signals.
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Abstract
A method and apparatus of determining a lower bound of an excess delay in a time of arrival measurement of a received signal. Determining the lower bound of an excess delay in a time of arrival measurements includes receiving signals from at least two base stations and determining the time difference of arrival between the received signals from their respective base stations. Then estimating a lower bound of excess delay introduced into the signals received from the base stations based on the time of arrival of the signals from the respective base stations and a known distance between the base stations. The lower bound of excess delay may be used to adjust the estimate of a mobile unit'"'"'s location based on the time of arrival measurements of the received signals.
169 Citations
20 Claims
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1. A method of determining location of a mobile unit, the method comprising:
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receiving signals from at least two base stations;
determining a time difference of arrival between the received signals;
estimating a lower bound of excess delay in accordance with the time of arrival of the signals and known distances between the base stations, wherein estimating the lower bound of excess delay is done with less than all of the signals received from the base stations; and
estimating a location of the mobile unit in accordance with the estimated lower bound of excess delay and the time difference of arrival between the received signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of determining location of a mobile unit, the method comprising:
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receiving signals front at least two base stations;
determining a time difference of arrival between the received signals;
estimating a a lower bound of excess delay in accordance with the time of arrival of the signals and known distances between the base stations; and
estimating a location of the mobile unit in accordance with the estimated lower bound of excess delay and the time difference of arrival between the received signals adjusting the estimated location of the mobile unit using the lower bound of excess delay. - View Dependent Claims (14, 15, 16)
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17. A method of determining location of a mobile unit, the method comprising:
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receiving signals from at least two base stations and determining the time of arrival at the mobile unit for the respective signals;
determining the time difference of arrival between the received signals from the respective base stations;
estimating a lower bound of excess delay in accordance with the time of arrival of the signals from their respective base stations and known distances between the base stations; and
transmitting the time difference of arrival and lower bound of excess delay to a different location and estimating location of the mobile unit in accordance with the estimated lower bound of excess delay and the time difference of arrival between the received signals at the different location. - View Dependent Claims (18)
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19. A method of determining location of a mobile unit, the method comprising:
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receiving signals from at least two base stations and determining the time of arrival it the mobile unit for the respective signals;
transmitting the times of arrival of the signals to a different location;
determining the time difference of arrival between the received signals from the respective base stations at the different location;
estimating a lower bound of excess delay in accordance with the time of arrival of each signal from its respective base station and known distance between the base stations at the different location; and
estimating location of the mobile unit in accordance with the estimated lower bound of excess delay and the time difference of arrival between the received signals at the different location. - View Dependent Claims (20)
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Specification