Location estimation of wireless terminals through pattern matching of deduced signal strengths
First Claim
1. A method comprising:
- receiving, by a location system, a report of a signal-strength measurement for a first signal, R1, at a wireless terminal;
when said location system does not receive a report of a signal strength of a second signal, RD, at said wireless terminal, deducing, by said location system, said signal strength of said second signal, RD, based on a transmit strength of a third signal, TU, that is transmitted by said wireless terminal; and
estimating the location of said wireless terminal based on;
(i) said signal strength measurement of said first signal, R1, and(ii) said deduced signal strength of said second signal, RD.
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Accused Products
Abstract
A method of estimating the location of a wireless terminal without the addition of hardware to either the wireless terminal or to the telecommunication system'"'"'s base stations is disclosed. The illustrative embodiment of the present invention is based on the observation that the signal strength of a signal from a transmitter is different at some locations, and, therefore, the location of a wireless terminal can be estimated by comparing the signal strength it currently observes against a map or database that correlates locations to signal strengths. Furthermore, the illustrative embodiment deduces the signal strength of the serving base station'"'"'s control channel signal at the wireless terminal, RD, based on the principal of reciprocity.
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Citations
42 Claims
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1. A method comprising:
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receiving, by a location system, a report of a signal-strength measurement for a first signal, R1, at a wireless terminal; when said location system does not receive a report of a signal strength of a second signal, RD, at said wireless terminal, deducing, by said location system, said signal strength of said second signal, RD, based on a transmit strength of a third signal, TU, that is transmitted by said wireless terminal; and estimating the location of said wireless terminal based on; (i) said signal strength measurement of said first signal, R1, and (ii) said deduced signal strength of said second signal, RD. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method comprising:
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receiving, by a location system, a report of a signal-strength measurement for a first signal, R1, at a wireless terminal; when said location system does not receive a report of a signal strength of a second signal, RD, at said wireless terminal, deducing, by said location system, said signal strength of said second signal, RD, based on a signal-strength measurement of a third signal, RU, at the location where said second signal is transmitted; and estimating the location of said wireless terminal based on; (i) said signal strength measurement of said first signal, R1, and (ii) said deduced signal strength of said second signal, RD. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15)
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16. A method comprising:
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receiving, by a location system, a report of a signal-strength measurement for a first signal, R1, at a wireless terminal; when said location system does not receive a report of a signal strength of a second signal, RD, at said wireless terminal, deducing, by said location system, said signal strength of said second signal, RD, based on an attenuation of a third signal, AU, that is transmitted by said wireless terminal; and estimating the location of said wireless terminal based on; (i) said signal strength measurement of said first signal, R1, and (ii) said deduced signal strength of said second signal, RD. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A location system for estimating the location of a wireless terminal, the location system comprising:
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a receiver for receiving a report of a signal-strength measurement for a first signal, R1, at said wireless terminal; and a processor for; (A) when said receiver does not receive a report of a signal strength of a second signal, RD, at said wireless terminal, deducing said signal strength of said second signal, RD, based on a transmit strength of a third signal, TU, that is transmitted by said wireless terminal, and (B) estimating the location of said wireless terminal based on; (i) said signal strength measurement of said first signal, R1, and (ii) said deduced signal strength of said second signal, RD. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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30. A location system for estimating the location of a wireless terminal, the location system comprising:
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a receiver for receiving a report of a signal-strength measurement for a first signal, R1, at said wireless terminal; and a processor for; (A) when said receiver does not receive a report of a signal strength of a second signal, RD, at said wireless terminal, deducing said signal strength of said second signal, RD, based on a signal-strength measurement of a third signal, RU, at the location where said second signal is transmitted, and (B) estimating the location of said wireless terminal based on; (i) said signal strength measurement of said first signal, R1, and (ii) said deduced signal strength of said second signal, RD. - View Dependent Claims (31, 32, 33, 34, 35)
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36. A location system for estimating the location of a wireless terminal, the location system comprising:
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a receiver for receiving a report of a signal-strength measurement for a first signal, R1, at said wireless terminal; and a processor for; (A) when said receiver does not receive a report of a signal strength of a second signal, RD, at said wireless terminal, deducing said signal strength of said second signal, RD, based on an attenuation of a third signal, AU, that is transmitted by said wireless terminal, and (B) estimating the location of said wireless terminal based on; (i) said signal strength measurement of said first signal, R1, and (ii) said deduced signal strength of said second signal, RD. - View Dependent Claims (37, 38, 39, 40, 41, 42)
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Specification