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Method of establishing inter-base-station synchronization and mobile radio communication system using the method

  • US 5,537,685 A
  • Filed: 10/06/1993
  • Issued: 07/16/1996
  • Est. Priority Date: 10/07/1992
  • Status: Expired due to Fees
First Claim
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1. A method of establishing synchronization between radio base stations in a mobile radio communication system comprising the steps of:

  • including, in a control signal transmitted at a predetermined time interval from each of the radio base stations, a synchronization establishing information indicating whether its own radio base station is in a first state in which synchronization has been established between its own radio base station and any other of the radio base stations or in a second state in which the synchronization has not yet been established;

    determining, in a receiving radio base station, which is one of the radio base stations and has received the control signal transmitted from a transmitting radio base station, which is any other of the base stations, and when said receiving radio base station is in the second state, whether the synchronization establishing information included in the received control signal indicates the first state or the second state;

    establishing, in the receiving radio base station, synchronization with the transmitting radio base station, when it is determined that the synchronization establishing information included in the received control signal indicates the first state;

    setting, after establishing the synchronization with the transmitting radio base station, the synchronization establishing information included in the control signal transmitted from the receiving radio base station to indicate the first state;

    selectively designating a key station with respect to each of the radio base stations; and

    setting, in each of the radio base stations which is in the second state and does not receive the control signal, which is transmitted from any other of the radio base stations and includes the synchronization established information indicating the first state, for a period of time longer than a predetermined time interval, the synchronization establishing information included in the control signal to be transmitted from said own radio base station to a state indicating the first state when said own radio base station is designated as the key station, and to a state indicating the second state when said own radio base station is not designated as the key station.

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