Adaptive downlink transmission power control arbiter

• US 6,414,946 B1
• Filed: 11/17/1998
• Issued: 07/02/2002
• Est. Priority Date: 11/19/1997
• Status: Expired due to Term

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: OKI Electric Industry Company Limited
• Inventors: Satou, Shinichi, Nishino, Masahiro
• Primary Examiner(s): Kizou, Hassan
• Assistant Examiner(s): LOGSDON, JOSEPH B
• Application Number:
  US09/193,715
• Publication Number:
  US 20020080734A1
• Time in Patent Office: 1,323 Days
• Field of Search: 370/252, 370/342, 370/913, 370/328, 370/329, 370/335, 370/441, 370/479, 375/130, 375/140, 375/227, 379/395.01, 455/500, 455/507, 455/517, 455/522
• US Class Current: 370/328
• CPC Class Codes: H04W 52/12 Outer and inner loops
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading

Abstract

A transmission power control device is provided for controlling transmission power of a transmission signal, so that interference between transmission signals to a plurality of mobile stations is reduced. The transmission power control device of the present invention comprises a total transmission power monitoring section 1 for monitoring total transmission power being transmitted to a plurality of mobile stations by a base station and outputting a monitor signal, a target total transmission power setting section 2 for calculating a total transmission power value applicable to a base station and outputting a setting signal, an adder 3, a multiplier 4, an adder 5, a delay circuit 6, a limiter 7, a desired SIR setting section 8 and an adder 9.

Claims

1. A transmission power control device comprising:

a total transmission power monitoring section for monitoring a total output power value being transmitted by a base station to a plurality of mobile stations, and outputting the power value as a monitor signal;

a target total transmission power setting section for calculating a total transmission power value appropriate for the base station and outputting the power value as a setting signal; and

a reference update amount calculating section for calculating a reference update amount from a difference between the monitor signal and the setting signal, and outputting the reference update amount, wherein

the reference update amount is used to update a target value of a signal-interference power ratio for the plurality of mobile stations.

2. A transmission power control device comprising:

a total transmission power monitoring section for monitoring a sum total of transmission signal power and outputting a first total transmission power value;

a first adder for subtracting a second total transmission power value appropriate for a base station from the first total transmission power value and outputting the result;

a multiplier for multiplying output of the first adder by a fixed number and outputting the result;

a second adder for adding output of the multiplier to a reference update amount a fixed time before and outputting the result as the reference update amount;

a delay circuit for delaying the reference update amount by the fixed time and outputting to the first adder; and

a third adder for subtracting the reference update amount from an initial value of a target value for a signal-interference power ratio of a plurality of mobile stations and outputting a new target value for the signal-interference power ratio.

3. The transmission power control device as disclosed in claim 2 further comprising a limiter for making the reference update amount a first threshold value when the output of the second adder is smaller than the first threshold value, making the reference update amount a second threshold value, that is larger than the first threshold value, when the output of the second adder is larger than the second threshold value, or making the reference update amount the output of the second adder when the output of the second adder is larger than the first threshold value but smaller than the second threshold value, and outputting the reference update amount to the third adder and the delay circuit.

4. A transmission power control device comprising:

a total transmission power monitoring section for monitoring a sum total of transmission signal output power and outputting a first total transmission power value;

a comparator, internally holding a fixed positive number and a fixed negative number, for comparing a second total transmission power value appropriate for a base station and the first total transmission power value and outputting the fixed positive number when the second total transmission power value is smaller than the first total transmission power value, or outputting the fixed negative number when the second total transmission power value is larger than the first total transmission power value;

a first adder for adding output from the comparator and a reference update amount a fixed time before, and outputting the result as an accumulative value;

a limiter, receiving the accumulative value as input, and making the reference update amount a first threshold value when the accumulative value is smaller than the first threshold value, making the reference update amount a second threshold value when the accumulative value is larger than the second threshold value that is larger than the first threshold value, or making the reference update amount the accumulative value when the accumulative value is larger than the first threshold value but smaller than the second threshold value, and outputting the reference update amount;

a delay circuit for delaying the reference update amount by the fixed time and outputting to the first adder; and

a second adder for subtracting the reference update amount from an initial value of target signal-interference power ratio value for each mobile station and outputting a new target signal-interference power ration value.

5. A transmission power control device comprising:

a total transmission power monitoring section for monitoring a sum total of transmission signal output power and outputting a first total transmission power value;

a first adder for subtracting a second total transmission power value appropriate for a base station from the first total transmission power value and outputting the result;

a first multiplier for multiplying output of the first adder by a fixed number and outputting the result;

a first adder for adding together output from the first multiplier and a reference update amount a fixed time before, and outputting the result as an accumulative value;

a limiter, receiving the accumulative value as input, and making the reference update amount a first threshold value when the accumulative value is smaller than the first threshold value, making the reference update amount a second threshold value, that is larger than the first threshold value, when the accumulative value is larger than the second threshold value, or making the reference update amount the accumulative value when the accumulative value is larger than the first threshold value but smaller than the second threshold value, and outputting the reference update amount;

a delay circuit for delaying the reference update amount by the fixed time and outputting to the first adder; and

new target value setting sections, the same in number as a number of media types, being input with the reference update amount, for respectively outputting new signal-interference power ratio target values for transmission signals of corresponding media, wherein

the new target value setting sections comprise

a second multiplier for multiplying the reference update amount by a priority coefficient and outputting the result, and

a third adder for subtracting output of the second multiplier from an initial value of signal-interference target value for transmission signals of corresponding media,

the priority coefficient being a value larger than 0 but less than 1 and tending towards 0 for important media.

6. The transmission power control device as disclosed in claim 5, wherein the second. total transmission power value is a value obtained by multiplying a total number of connection circuits between the base station and each of the mobile stations and the reference transmission power of the base station.

7. A transmission power control device comprising:

new target value setting sections, the same in number as a number of media types, for respectively outputting new signal-interference power ratio target values for transmission signals of respective media; and

a received power measuring section for measuring received power per one circuit of each media and outputting the receive power of one circuit of corresponding media to the new target setting sections for each media, wherein;

each of the new target value setting sections comprises,

a total transmission power monitoring section for monitoring a sum total of transmission signal power for corresponding media and outputting a total transmission power output,

a target total transmission power setting section for multiplying a total number connection circuits of corresponding media between a base station and each mobile station, and outputting the result,

a first adder for subtracting output of the target total transmission power setting section from the total transmission power value and outputting the result,

a first multiplier for multiplying output of the first adder by a fixed number and outputting the result,

a second adder for adding together output of the first multiplier and a reference update amount a fixed time before, and outputting as an accumulative value,

a limiter, receiving the accumulative value as input, and making the reference update amount a first threshold value when the accumulative value is smaller than the first threshold value, making the reference update amount a second threshold value, that is larger than the first threshold value, when the accumulative value is larger than the second threshold value, or making the reference update amount the accumulative value when the accumulative value is larger than the first threshold value but smaller than the second threshold value, and outputting the reference update amount;

a delay circuit for delaying the reference update amount by the fixed time and outputting to the first adder;

second multiplier for multiplying the reference update amount by a priority coefficient, and

a third adder for subtracting output of the second adder from an initial value of signal-interference power ratio target value for transmission signals of corresponding media,

the priority coefficient being a value larger than 0 but less than 1 and tending towards 0 for important media.