| 摘要 |
Positioning systems and methods for portable devices. The system comprises a plurality of access points, at least one portable device, and a service provider. Each access point has identification and set at a location. The portable device has identification, and wirelessly couples to a network provided by the service provider via one of the access points. The service provider has a database comprising access point information and at least one access record. The access point information records the identification and locations corresponding to respective access points. The access record records at least the identification of the portable device and the identification of the access point coupled thereto. The service provider determines the location information of the portable device according to the access point information and the access record.
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