Patent ID: 7843862
Filing Date: 2010-11-30
Classification: H04W

Abstract:
1. A method of transmitting and receiving packets containing data and positional information between a plurality of devices in a radio frequency network in communication with a global positioning system, wherein each device comprises a device clock, comprising the steps of: determining the periodic position coordinates of each said device using said global positioning system; synchronizing all the device clocks to a clock of said global positioning system; transmitting position coordinates from each device at staggered points in time that are randomized, wherein said randomizing is performed in discrete steps, and wherein the time period of each discrete step is of a duration sufficient for one device to transmit a positional update to other devices in the radio frequency network; generating a positional update table at each device containing device identifiers, said positional update table comprising positional coordinates and time stamps for all devices in said radio frequency network; creating and maintaining for each device a proximity table that contains a table of identifiers for all other devices with information on whether the device is in direct contact with said other devices or not; and transmitting said positioning update table and said proximity table of each device to every other device in the network, and receiving the positioning update table and said proximity table at each device in the network.