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Portable telephones

  • US 4,748,655 A
  • Filed: 07/24/1985
  • Issued: 05/31/1988
  • Est. Priority Date: 07/25/1984
  • Status: Expired due to Fees
First Claim
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1. A communications system for use in conjunction with an existing cellular radio telecommunications network, having a network control, and a plurality of base stations each servicing a cell, said system including a plurality of gateway devices, each gateway device including a transmitter, a receiver, a memory, and control means operatively connected to said transmitter, receiver and memory to provide two way radio communication with said network control via a base station, and a plurality of portable telephones, each having a memory for an identification number and a transmitter and a receiver operative when said portable telephone is in an "on" state to provide two way radio communication on a plurality of fixed channels at low power with said transmitter and receiver of any said gateway device within range, and through said device to a said base station of the cell within which said gateway device is located, each said portable telephone when in said "on" state and in the vicinity of a said gateway device being operative to transmit its identification number from its memory to said gateway device, said control means of said gateway device being operative to store said identification number in said memory of said gateway device, and to transmit said identification number to said network control via a said base station, said control means of the gateway device thereafter being operative as a control for the portable telephone for setting up and handling off calls for the portable telephone, all communications between the portable telephone and the gateway device while the portable telephone is in an "on" state being carried out on a single fixed channel of said plurality of channels, said portable telephone and gateway device only being operable together as a conventional terminal of said existing cellular radio telecommunications network.

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