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Mobile radio communications system having a supervising radio transmitting station for transmitting a reference synchronizing signal to a first and second base stations via a radio link

  • US 5,410,588 A
  • Filed: 07/13/1994
  • Issued: 04/25/1995
  • Est. Priority Date: 04/03/1991
  • Status: Expired due to Term
First Claim
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1. A radio communication system comprising:

  • a plurality of base stations, each forming a radio zone;

    a plurality of mobile stations, wherein signals are transmitted between said plurality of mobile stations and said plurality of base stations in a time-division multiplexing manner over a first radio link established using digital radio circuitry that time-division multiplexes a specific time interval into a plurality of time slots;

    at least one supervising radio transmitting station for transmitting a reference synchronizing signal to a first and a second base station of said plurality of base stations via a second radio link, said reference synchronizing signal being used in establishing a synchronous relationship between said first and second base stations;

    receiving means provided in each of said first and second base stations, for receiving said reference synchronizing signal from said supervising radio transmitting station via said second radio link; and

    synchronizing means provided in each of said first and second base stations, for establishing a synchronous time-slot relationship in said digital radio circuitry between said first and second base stations and said mobile stations, based on said reference synchronizing signal received by said receiving means,wherein said digital radio circuitry includes a frequency variable control unit for establishing a transmission frequency at which a mobile station and a base station transmit signals over the first radio link based on said reference synchronizing signal.

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