Patent ID: 8538453

Claim:
A location tracking method in a coordinator-based wireless network, the location tracking method comprising: receiving from a first device a first frame including an identifier of the first device and an identifier of a second device so that a coordinator of a first coordinator-based wireless network can track the second device, wherein the second device is in a second coordinator-based wireless network separate from the first coordinator-based wireless network; transmitting from the coordinator of the first coordinator-based wireless network a second frame including an identifier of the first coordinator-based wireless network, the identifier of the first device, and the identifier of the second device to a coordinator of the second coordinator-based wireless network; receiving at the coordinator of the first coordinator-based wireless network a third frame including the identifier of the first coordinator-based wireless network, the identifier of the first device, the identifier of the second device and location information of the second device, transmitted by the coordinator of the second coordinator-based wireless network, as a response to the second frame; and transmitting a fourth frame including the location information of the second device to the first device by the coordinator of the first coordinator-based wireless network, wherein the first coordinator-based wireless network is a network in which the coordinator assigns channel time to other devices within the first coordinator-based wireless network for data transmission, wherein computing capability and resources of the coordinator are highest among all devices of the first coordinator-based wireless network, and wherein if the coordinator of the second coordinator-based wireless network receives at least three location calculating information of the second device, the coordinator of the second coordinator-based wireless network selects three location calculating information that are determined based on their received signal strength values, wherein the first and second wireless networks are based on the IEEE 802.15.4a protocol using Ultra Wideband (UWB) for the Physical Layer (PHY).