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Methods in a cellular mobile radio communication system

  • US 5,487,174 A
  • Filed: 03/23/1993
  • Issued: 01/23/1996
  • Est. Priority Date: 03/24/1992
  • Status: Expired due to Term
First Claim
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1. A method of bidirectional communication in a cellular mobile telecommunication system having cells of substantially different size and a base station for each cell, comprising the steps of:

  • assigning a first base station of a first larger cell for a downlink of a bidirectional connection involving a mobile station and a second base station of a second cell smaller than the first cell for an uplink of the bidirectional connection;

    transmitting from the mobile station radio signals pertaining to the connection;

    measuring the strength of radio signals from the mobile station received by the first and second base stations;

    comparing the measured strength of signals from the mobile station with each other and at least one desired value;

    transmitting power control messages from the first base station to the mobile station in response to the result of the comparison;

    monitoring the downlink and the uplink of the connection; and

    when downlink handoff from the first cell to the second cell is desirable, performing handoff of the downlink of the connection from the first cell independently of handoff of the uplink of the connection.

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