Estimating a subscriber location
First Claim
1. A method of estimating a location of a subscriber, comprising:
- receiving a request for the location of the subscriber;
identifying a serving base station associated with the subscriber;
receiving a downlink frame from the serving base station;
obtaining a time delay associated with a signal transmitted between the subscriber and the serving base station, the obtaining including estimating a time of arrival of the signal by extracting information from the received downlink frame, the extracting including,determining a channel impulse response associated with the downlink frame, andestimating the time of arrival by comparing a peak time of the determined channel impulse response with a start time associated with the downlink frame, the start time being estimated based on the channel impulse response exceeding a predetermined threshold value;
estimating a distance between the subscriber and the serving base station based on the time delay; and
estimating the location of the subscriber based on the estimated distance between the subscriber and the serving base station.
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0 Petitions
Accused Products
Abstract
Estimating a location of a subscriber, including receiving a request for the location, identifying a serving base station of the subscriber, receiving a downlink frame from the serving base station, obtaining a time delay of a signal transmitted between the subscriber and the serving base station, the obtaining including estimating a time of arrival by extracting information from the received downlink frame, the extracting including, determining a channel impulse response of the downlink frame, and estimating the time of arrival by comparing a peak time of the determined channel impulse response with a start time of the downlink frame, the start time being estimated based on the channel impulse response exceeding a predetermined threshold value, estimating a distance between the subscriber and the serving base station based on the time delay, and estimating the location based on the estimated distance between the subscriber and the serving base station.
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Citations
20 Claims
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1. A method of estimating a location of a subscriber, comprising:
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receiving a request for the location of the subscriber; identifying a serving base station associated with the subscriber; receiving a downlink frame from the serving base station; obtaining a time delay associated with a signal transmitted between the subscriber and the serving base station, the obtaining including estimating a time of arrival of the signal by extracting information from the received downlink frame, the extracting including, determining a channel impulse response associated with the downlink frame, and estimating the time of arrival by comparing a peak time of the determined channel impulse response with a start time associated with the downlink frame, the start time being estimated based on the channel impulse response exceeding a predetermined threshold value; estimating a distance between the subscriber and the serving base station based on the time delay; and estimating the location of the subscriber based on the estimated distance between the subscriber and the serving base station. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A subscriber for estimating a location of the subscriber, comprising:
a processor configured to; receive a request for the location of the subscriber; identify a serving base station associated with the subscriber; receive a downlink frame from the serving base station; obtain a time delay associated with the signal transmitted between the subscriber and the serving base station by estimating a time of arrival of the signal by extracting information from the received downlink frame, wherein to extract information from the received downlink frame, the processor is configured to; determine a channel impulse response associated with the downlink frame, and estimate the time of arrival by comparing a peak time of the determined channel impulse response with a start time associated with the downlink frame, the start time being estimated based on the channel impulse response exceeding a predetermined threshold value; estimate a distance between the subscriber and the serving base station based on the time delay; and estimate the location of the subscriber based on the estimated distance between the subscriber and the serving base station. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A system, comprising:
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a subscriber; a serving base station associated with the subscriber; and a neighboring base station associated with the subscriber, wherein the subscriber is configured to; receive a request for a location of the subscriber; identify the serving base station associated with the silbscriber; receive a downlink frame from the serving base station; obtain a time delay associated with a signal transmitted between the subscriber and the serving base station by estimating a time of arrival of the signal by extracting information from the received downlink frame, wherein to extract information from the received downlink frame, the subscriber is configured to determine a channel impulse response associated with the downlink frame, and estimate the time of arrival by comparing a peak time of the determined channel impulse response with a start time associated with the downlink frame, the start time being estimated based on the channel impulse response exceeding a predetermined threshold value; estimate a distance between the subscriber and the serving base station based on the time delay; and estimate the location of the subscriber based on the estimated distance between the subscriber and the serving base station. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification