Patent ID: 9363783
Filing Date: 2016-06-07
CPC Classification: G01S,G08G,H04W

Claim Text:
1. A wifi based mobile device positioning system, the system comprising: an access point device for receiving receive messages transmitted from a plurality of other communication devices, each receive message including a transmit count stamp corresponding to a remote counter value at a transmission of the receive message from a corresponding other communication device, wherein the access point is further operable to generate a receive count stamp for each receive message corresponding to a local counter value at receipt of a receive message from the other communication devices and for messages received from a mobile communication device; a node in communication with the access point, the node including a processor programmed to dynamically associate and disassociate the mobile communication device with a plurality of sub-groups of the plurality of other communication devices, based at least in part on receiving receive messages from a predetermined number of other communication devices for each sub-group; and a programmed processor executing to generate range estimates between the mobile communication device and other communication devices in the sub-group currently associated with the mobile communication device, the range estimates based on a combination of the transmit count stamps and the receive count stamps; and wherein at least one of the range estimates is a mobile device range estimate between the mobile device and a second communication device that the mobile communication device is newly associated with in one of the sub-groups, and the mobile device range estimate is computed as a function of count stamps previously communicated between the mobile device and other communication devices in the plurality of sub-groups.