Patent ID: 7440427

Claim:
A system for Time Division Multiple Access (TDMA) communications, comprising a plurality of one-way transmitters sharing a communication channel and at least one matching receiver, and a Global Navigation Satellite System (GNSS) decoder coupled to each of said transmitters, said transmitters configured to define: i) a transmission cycle divided to a set of adjacent time slots; ii) a geographical partition of earth surface to cells; and iii) a sub set of time slots, comprising a plurality of time slots from said set of time slots, allocated to each of said cells; each transmitter configured to transmit during one time slot or less per transmission cycle, wherein said one time slot determined by each transmitter as following: a) determining the start time of transmission cycles and time slots according to at least a timing signal and/or time data acquired from said GNSS decoder; b) determining self location and the corresponding cell according to at least data acquired from said GNSS decoder; c) selecting one time slot from the sub set of time slots allocated to said corresponding cell, in a random or pseudo-random way.