Patent ID: 7606575

Claim:
A radio frequency data communication system for transmission of data collected by a multiplicity of mobile transceiver units, to a base transceiver, comprising: a base transceiver selectively operable at a limited data rate and at an increased data rate, the base transceiver supporting spread spectrum communications; the multiplicity of mobile transceiver units selectively operable at the limited data rate and at the increased data rate, the mobile transceiver units supporting spread spectrum communications; said mobile transceiver units responsive to transmissions by said base transceiver, and having control means therein to evaluate the feasibility of responding at said increased data rate; said base transceiver effecting a communication link with one or more of said mobile transceiver units; said mobile transceiver units for which a communication link with said base transceiver has not been established receiving the transmissions of said base transceiver to said mobile transceiver units with which a communication link has been established; said mobile transceiver units evaluating for consistent reception of said transmissions to said one or more transceiver units; said mobile units which consistently receive transmissions at the increased data rate responding to the base transceiver at said increased data rate when said base transceiver directs communication to said mobile unit.