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Radio communication system and communication terminal equipments thereof

  • US 5,852,767 A
  • Filed: 04/23/1996
  • Issued: 12/22/1998
  • Est. Priority Date: 04/28/1995
  • Status: Expired due to Fees
First Claim
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1. A radio communication system for communicating between a first communication terminal equipment and second communication terminal equipment by using a frequency band of an existing microwave transmission system, wherein:

  • said first communication terminal equipment comprisesdemodulating means for demodulating a signal transmitted from a base station of another radio communication system giving no interference with the existing microwave transmission system;

    means for judging whether a present position of said first communication terminal equipment is within an area in which communication can occur without interference with the existing microwave transmission system, based on information specifying the position of said base station of said another radio communication system giving no interference with the existing microwave transmission system, andmeans responsive to a determination by said means for judging that the present position is within said area for shifting to a transmission state and transmitting a registration message indicative of said transmission state to said second communication terminal equipment; and

    said second communication terminal equipment comprises means for shifting a transmission state in response to receiving said registration message.

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