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Method and apparatus for controlling transmission power of a radio transmitter

  • US 5,839,056 A
  • Filed: 08/30/1996
  • Issued: 11/17/1998
  • Est. Priority Date: 08/31/1995
  • Status: Expired due to Fees
First Claim
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1. A method for controlling transmission power of a radio transmitter in a radio cell in a cellular communications system, comprising the steps of:

  • determining a first reference value (SIRm) indicating the quality of signals received from the radio transmitter;

    determining a second reference value (Pm, SIRpm) indicating current traffic load in the radio cellcommanding the radio transmitter to adjust transmission power thereof; and

    comparing both said first reference value (SIRm) indicating the quality of the received signals, and said second reference value (Pm, SIRpm) indicating the traffic load, with predetermined target values (SIRt, Pt, SIRpt) to obtain a result;

    said commanding includes commanding the radio transmitter to adjust the transmission power thereof depending on said result of said comparison;

    said comparing of said first reference value (SIRm) indicating the quality of the received signals, and said second reference value (Pm) indicating the traffic load with predetermined target values (SIRt, Pt) comprises;

    calculating a first comparison value based on a relationship between said first reference value (SIRm) and a target value for said first reference value (SIRt);

    calculating a second comparison value based on a relationship between said second reference value (Pm) and a target value for said second reference value (Pt);

    combining said first and second comparison values to obtain a weighted comparison value (CV) which depends more on said first comparison value than on said second comparison value; and

    comparing said weighted comparison value with a predetermined reference value to thereby determine if the transmission power of the radio transmitter should be increased or decreased.

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