| US 7,383,051 B2 | ||
| Estimating the location of a mobile unit based on the elimination of improbable locations | ||
| David Stevenson Spain, Jr., Portola Valley, Calif. (US); Robert Lewis Martin, Antioch, Calif. (US); and Luis Perez-Breva, Barcelona (Spain) | ||
| Assigned to Polaris Wireless, Inc., Santa Clara, Calif. (US) | ||
| Filed on Aug. 01, 2005, as Appl. No. 11/194,151. | ||
| Application 11/194151 is a continuation of application No. 10/299398, filed on Nov. 18, 2002, granted, now 6,944,465. | ||
| Application 10/299398 is a continuation in part of application No. 10/128128, filed on Apr. 22, 2002, granted, now 6,782,265. | ||
| Application 10/128128 is a continuation of application No. 09/532418, filed on Mar. 22, 2000, granted, now 6,393,294. | ||
| Application 09/532418 is a continuation in part of application No. 09/158296, filed on Sep. 22, 1998, granted, now 6,269,246. | ||
| Prior Publication US 2007/0026870 A1, Feb. 01, 2007 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. H04Q 7/20 (2006.01); H04M 11/04 (2006.01) | ||
| U.S. Cl. 455—456.1 [455/404.2; 455/456.6; 455/229; 455/421; 455/422.1; 340/989; 340/991] | 9 Claims |
| 1. A method for estimating the location of a mobile unit, the method comprising:
receiving the cell ID of the cell site servicing the mobile unit;
generating a plurality of possible positions in which the mobile unit might be based on the cell ID;
receiving an indication that the mobile unit did not receive a first signal from a first transmitter;
eliminating at least one of the plurality of possible positions for the mobile unit as the estimate for the position of the
mobile unit based on the fact that the mobile unit did not receive the first signal from the first transmitter.
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