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; 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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Accused Products
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.
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Citations
65 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; 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, 13, 14, 15, 16, 17)
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18. A mobile unit comprising:
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a receiver configured to receive respective signals from at least two base stations, and to determine a time of arrival of the signals transmitted by each base station;
an excess delay engine configured to receive the time of arrival of the signals and to estimate 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. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34)
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35. A base station comprising:
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a receiver configured to receive signals from at least one mobile unit, wherein the signals received from the at least one mobile unit comprise the times of arrival of signals received by the mobile unit from at least two base stations; and
an excess delay engine configured to receive the times of arrival of the signals and to estimate a lower bound of excess delay for the times of arrival of the signals from their respective base stations wherein the base stations are located known distances apart. - View Dependent Claims (36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
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47. An integrated circuit configured to determine a lower bound of an excess delay in a time of arrival measurement of a received signal, the integrated circuit comprising:
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a input circuit configured to receive signals from at least two base stations and to output a time of arrival measurement for each received signal;
an excess delay engine configured to determine a time difference of arrival between the received signals from the respective base stations, and to estimate a lower bound of excess delay introduced into the signals received from each base station based on the time of arrival of each signal from its respective base station and a known distance between two associated base stations. - View Dependent Claims (48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59)
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60. 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 (61)
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62. 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;
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 a 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 (63)
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64. A mobile unit comprising:
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a receiver configured to receive respective signals from at least two base stations, and to determine a time of arrival of the signals transmitted by each base station; and
a transmitter configured to accept the time of arrival and to transmit the time of arrival to a different location. - View Dependent Claims (65)
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Specification