Subscriptionless location of wireless devices

H - Electricity – 04 – W

Patent

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H04W 64/00 (2009.01) H04W 4/22 (2009.01)

Patent

CA 2673758

Techniques for locating wireless devices involve a wireless device making measurements of signals transmitted by geographically distributed base stations within a wireless network. If some key site information is known about these transmitters, such as the transmitter location, transmit signal power, signal propagation, and transmit signal timing, measurements of these transmit signals by a device to be located can be used to determine the position of the device. In this example, all information exchange between the device and the location node is facilitated by a data link that is not provided by the wireless network providing signals used in the location estimation process. Accordingly, devices may be located based on downlink signal measurements made by the devices, where the devices are not part of the wireless network, are not provided wireless service by the network, and do not possess the ability to transmit signals to the wireless network, and where communication resources of the wireless network are not consumed to facilitate location.

Les techniques de localisation de dispositifs sans fil font intervenir un dispositif sans fil qui mesure des signaux transmis par des stations de base réparties géographiquement au sein d'un réseau sans fil. Lorsque certaines informations de site clés sont connues sur ces émetteurs, telles qu'emplacement de l'émetteur, puissance du signal de transmission, propagation du signal et moment du signal de transmission, il est possible d'utiliser les mesures des ces signaux de transmission par un dispositif à localiser peuvent être utilisées pour déterminer la position dudit dispositif. Dans cet exemple, tous les échanges d'informations entre le dispositif et le noeud de localisation sont facilités par une liaison de données qui n'est pas fournie par le réseau sans fil fournissant les signaux utilisés au cours du processus d'estimation de position. Par voie de conséquence, des dispositifs peuvent être localisés à partir des mesures de signal en liaison descendante qu'effectuent ces dispositifs, alors que ces derniers ne reçoivent pas les services sans fil fournis par le réseau, et n'ont pas la capacité de transmettre des signaux au réseau sans fil, les ressources dudit réseau n'intervenant pas pour faciliter la localisation.

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