| 摘要 |
A method and apparatus of estimating a location of a subscriber are disclosed. One method includes receiving a request for the location of the subscriber. The subscriber's serving base station, and a plurality of neighboring base stations sensed by the subscriber, are identified. At least two of the neighboring base stations are selected to aid in estimating the location of the subscriber. Stored locations of the serving base station and the selected neighboring base stations are accessed. The subscriber obtains a time delay from the serving base station for maintaining synchronization of the subscriber with the serving base station. The subscriber estimates a distance between the subscriber and the serving base station based on the time delay. The subscriber receives frames including preambles from each of the selected neighboring base stations, and estimates a delta time for each of the selected neighboring base stations for the subscriber to synchronize to each of the selected neighboring base stations. The subscriber estimates distances between the subscriber and each of the selected neighboring base stations based on the time delay and the delta time of each of the selected neighboring base stations. The subscriber location is estimated by trilateration of the distance between the subscriber and the serving base station, and the distances between the subscriber and each of the selected neighboring base stations.
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