Method and apparatus for controlling transmission power of a radio transmitter
First Claim
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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Accused Products
Abstract
A method for controlling transmission power of a radio transmitter in a cellular communications system, such as in a CDMA-system, which includes determining a reference value (SIRm) indicating the quality of the signals received from the radiotransmitter, determining a reference value (Pm, SIRpm) indicating the current traffic load in the radiocell, and commanding the radio transmitter to adjust transmission power. In order to improve speed and reliability during any traffic conditions the method includes comparing both the reference value (SIRm) for the quality of the received signals, and the reference value (Pm, SIRpm) for the traffic load with predetermined target values (SIRt, Pt, SIRpt), and practicing the commanding of the radio transmitter to adjust its transmission power depending on the result of the comparison.
216 Citations
9 Claims
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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:
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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 cell commanding 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. - View Dependent Claims (2, 3, 4)
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5. A base station serving a radio cell of a cellular radio system comprising:
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means for communicating with mobile radio stations by using radio frequency signals; measurement means for measuring a first reference value for the quality of radio signals received from a said mobile radio station and means for determining a second reference value for traffic load in said radio cell; control means for commanding said mobile radio station to increase or to decrease transmission power used by said mobile radio station for transmitting radio signals, by transmitting a message to said mobile radio station; wherein said control means are adapted to; calculate a first comparison value based on the relationship between said first reference value and a target value for said first reference value; calculate a second comparison value based on the relationship between said second reference value and a target value for said second reference value; combine said first and second comparison values to obtain a weighted comparison value which depends more on said first comparison value than on said second comparison value; compare said weighted comparison value with a predetermined reference value; and command said mobile radio station to increase or to decrease transmission power in response to a result of said comparison. - View Dependent Claims (6, 7)
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8. A mobile station of a cellular radio system comprising:
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means for communicating with a base station serving a radio cell, by using radio frequency signals; measurement means for measuring a first reference value for the quality of radio signals received from said base station and means for determining a second reference value for traffic load in said radio cell; and control means which are adapted to; calculate a first comparison value based on the relationship between said first reference value and a target value for said first reference value; calculate a second comparison value based on the relationship between said second reference value and a target value for said second reference value; combine said first and second comparison values to obtain a weighted comparison value which depends more on said first comparison value than on said second comparison value; compare said weighted comparison value with a predetermined reference value; and command said base station to increase or to decrease transmission power as a response to a result of said comparison, by transmitting a message to said base station. - View Dependent Claims (9)
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Specification