Method and apparatus for providing limiting power adjustment in a wireless communication system

• US 20060084391A1
• Filed: 10/15/2004
• Published: 04/20/2006
• Est. Priority Date: 10/15/2004
• Status: Active Grant

• Current Assignee: Modesmata Corporation
• Original Assignee: Nokia Corporation
• Inventors: Chmiel, Maciej
• Granted Patent: US 7,283,792 B2
• Time in Patent Office: Days
• US Class Current: 455/69
• CPC Class Codes: H03G 3/3042 in modulators, frequency-changers, transmitters or power amplifiers transmission power control in bidirectional transmission systems H04W52/04
• CPC Class Codes: H04W 52/288 taking into account the usage mode, e.g. hands-free, data transmission, telephone

Abstract

An approach provides for limiting power adjustment in a wireless system (e.g., cellular network) to extend, for example, talk time. Parameter values specifying operating conditions of the wireless terminal are collected for power adjustment of a radio frequency (RF) amplifier within the wireless terminal. A power adjustment factor is computed based on the parameter values, wherein the power adjustment factor is used adjust limiting power of the RF amplifier.

Claims

1. A method for controlling transmission power in a wireless terminal, the method comprising:

determining a plurality of parameter values for power adjustment of a radio frequency (RF) amplifier within the wireless terminal, the parameter values specifying operating conditions of the wireless terminal; and

computing a power adjustment factor based on the parameter values,

wherein the power adjustment factor is used to adjust limiting power of the RF amplifier.

2. A method according to claim 1, wherein the wireless terminal is powered by a battery, and the power adjustment factor is computed to minimize current drain of the battery.

3. A method according to claim 2, wherein the operating conditions include transmit frequency, voltage of the battery, temperature of the wireless terminal, and channel information.

4. A method according to claim 3, wherein the power adjustment factor (PAPA) is computed according to:

P_APA(dB)=A_n*Freqⁿ+A_n-1*Freq^n-1+ . . . +A*Freq+B_n*V_battⁿ+B_n-1*V_batt^n-1+ . . . +B*V_batt+C_n*Tⁿ+C_n-1*T^n-1+ . . . +C*T+Channel*D+E

wherein Freq is the transmit frequency, V_batt is the battery voltage, T is an internal temperature of the wireless terminal, Channel is the channel information, A_n . . . A are frequency coefficients, B_n . . . B are battery voltage coefficients, C_n . . . C are temperature coefficients, D is a channel configuration coefficient, E is a constant, and n is an integer.

5. A method according to claim 1, wherein the wireless terminal operates in a cellular system.

6. A method according to claim 5, wherein the cellular system utilizes Code Division Multiple Access (CDMA) or Wideband CDMA (WCDMA) for serving the wireless terminal.

7. A method according to claim 5, wherein the wireless terminal is a cellular phone.

8. A method according to claim 1, further comprising:

modifying the transmission power with an adjustment factor for temperature, wherein the temperature adjustment factor provides linear correction that is frequency dependent.

9. A computer-readable medium bearing instructions for controlling transmission power in a wireless terminal, said instructions, being arranged, upon execution, to cause one or more processors to perform the method of claim 1.

10. An apparatus for controlling transmission power in a wireless terminal, the apparatus comprising:

logic configured to determine a plurality of parameter values for power adjustment of a radio frequency (RF) amplifier within the wireless terminal, the parameter values specifying operating conditions of the wireless terminal, the logic being further configured to compute a power adjustment factor based on the parameter values,

wherein the power adjustment factor is used to adjust limiting power of the RF amplifier.

11. An apparatus according to claim 10, wherein the wireless terminal is powered by a battery, and the power adjustment factor is computed to minimize current drain of the battery.

12. An apparatus according to claim 11, wherein the operating conditions include transmit frequency, voltage of the battery, temperature of the wireless terminal, and channel information.

13. An apparatus according to claim 12, wherein the power adjustment factor (P_APA) is computed according to:

P_APA(dB)=A_n*Freqⁿ+A_n-1*Freq^n-1+ . . . +A*Freq+B_n*V_battⁿ+B_n-1*V_batt^n-1+ . . . +B*V_batt+C_n*Tⁿ+C_n-1*T^n-1+ . . . +C*T+Channel*D+E

wherein Freq is the transmit frequency, V_batt is the battery voltage, T is an internal temperature of the wireless terminal, Channel is the channel information, A_n . . . A are frequency coefficients, B_n . . . B are battery voltage coefficients, C_n . . . C are temperature coefficients, D is a channel configuration coefficient, E is a constant, and n is an integer.

14. An apparatus according to claim 10, wherein the wireless terminal operates in a cellular system.

15. An apparatus according to claim 14, wherein the cellular system utilizes Code Division Multiple Access (CDMA) or Wideband CDMA (WCDMA) for serving the wireless terminal.

16. An apparatus according to claim 14, wherein the wireless terminal is a cellular phone.

17. An apparatus according to claim 10, wherein the logic is further configured to determine an adjustment factor for temperature, wherein the temperature adjustment factor provides linear correction of output power of the RF amplifier according to frequency.

18. An apparatus for communicating in a radio communication system, the apparatus comprising:

a radio frequency (RF) amplifier configured to amplify a signal for transmission over the radio communication system; and

logic configured to determine a plurality of parameter values for power adjustment of the RF amplifier, the parameter value specifying operating conditions, the logic being further configured to compute a power adjustment factor based on the parameter values, wherein the power adjustment factor is used to adjust input power of the RF amplifier.

19. An apparatus according to claim 18, further comprising:

a battery configured to supply power to the apparatus, wherein the power adjustment factor is computed to minimize current drain of the battery.

20. An apparatus according to claim 19, wherein the operating conditions include transmit frequency, voltage of the battery, temperature of the apparatus, and channel information.

21. An apparatus according to claim 20, wherein the power adjustment factor (P_APA) is computed according to:

P_APA(dB)=A_n*Freqⁿ+A_n-1*Freq^n-1+ . . . +A*Freq+B_n*V_battⁿ+B_n-1*V_batt^n-1+ . . . +B*V_batt+C_n*Tⁿ+C_n-1*T^n-1+ . . . +C*T+Channel*D+E

wherein Freq is the transmit frequency, V_batt is the battery voltage, T is an internal temperature of the wireless terminal, Channel is the channel information, A_n . . . A are frequency coefficients, B_n . . . B are battery voltage coefficients, C_n . . . C are temperature coefficients, D is a channel configuration coefficient, E is a constant, and n is an integer.

22. An apparatus according to claim 18, wherein the radio communication system is a cellular system.

23. An apparatus according to claim 22, wherein the cellular system utilizes Code Division Multiple Access (CDMA) or Wideband CDMA (WCDMA) for processing the signal.

24. An apparatus according to claim 22, wherein the apparatus is a cellular phone.

25. An apparatus according to claim 18, wherein the logic is further configured to determine an adjustment factor for temperature, wherein the temperature adjustment factor provides linear correction of output power of the RF amplifier according to frequency.

26. An apparatus for controlling transmission power, the apparatus comprising:

means for determining a plurality of parameter values for power adjustment of a radio frequency (RF) amplifier within a wireless terminal, the parameter values specifying operating conditions of the wireless terminal; and

means for computing a power adjustment factor based on the parameter values,

wherein the power adjustment factor is used to adjust limiting power of the RF amplifier.

27. An apparatus according to claim 26, wherein the wireless terminal is powered by a battery, and the power adjustment factor is computed to minimize current drain of the battery.

28. An apparatus according to claim 27, wherein the operating conditions include transmit frequency, voltage of the battery, temperature of the wireless terminal, and channel information.

29. An apparatus according to claim 28, wherein the power adjustment factor (PAPA) is computed according to:

P_APA(dB)=A_n*Freqⁿ+A_n-1*Freq^n-1+ . . . +A*Freq+B_n*V_battⁿ+B_n-1*V_batt^n-1+ . . . +B*V_batt+C_n*Tⁿ+C_n-1*T^n-1+ . . . +C*T+Channel*D+E

wherein Freq is the transmit frequency, V_batt is the battery voltage, T is an internal temperature of the wireless terminal, Channel is the channel information, A_n . . . A are frequency coefficients, B_n . . . B are battery voltage coefficients, C_n . . . C are temperature coefficients, D is a channel configuration coefficient, E is a constant, and n is an integer.

30. An apparatus according to claim 26, wherein the wireless terminal operates in a cellular system.

31. An apparatus according to claim 30, wherein the cellular system utilizes Code Division Multiple Access (CDMA) or Wideband CDMA (WCDMA) for serving the wireless terminal.

32. An apparatus according to claim 30, wherein the wireless terminal is a cellular phone.

33. An apparatus according to claim 26, further comprising:

means for determining an adjustment factor for temperature, wherein the temperature adjustment factor provides linear correction of the transmission power according to frequency.

34. A method for adjusting power of a transmitter power amplifier in a wireless terminal, the method comprising:

collecting sensor information on operating conditions of the wireless terminal;

determining, based on the collected sensor information and stored parameter values, an adjustment factor for modifying a tuned power of a radio frequency (RF) amplifier within the wireless terminal, the adjustment factor modifying limiting power of the transmitter power amplifier for the operating conditions; and

generating output power by applying the determined adjustment factor to the tuned power.

35. A method according to claim 34, wherein the wireless terminal is powered by a battery, and the adjustment factor minimizes current drain of the battery.

36. A method according to claim 35, wherein the sensor information includes temperature of the wireless terminal and voltage of the battery, and the parameter values include frequency, channel information, and coefficient values corresponding to the temperature, the voltage of the battery, the frequency and the channel information.

37. A computer-readable medium bearing instructions for adjusting power of a transmitter power amplifier in a wireless terminal, said instructions, being arranged, upon execution, to cause one or more processors to perform the method of claim 34.

38. An apparatus for operating in a wireless network, the method comprising:

means for collecting sensor information on operating conditions;

means for determining, based on the collected sensor information and stored parameter values, an adjustment factor for modifying a tuned power of a radio frequency (RF) amplifier, the adjustment factor modifying limiting power of the RF amplifier for the operating conditions; and

means for generating output power by applying the determined adjustment factor to the tuned power.

39. An apparatus according to claim 38, further comprising:

a power source configured to power the RF power amplifier, wherein the adjustment factor minimizes consumption of the power source.

40. An apparatus according to claim 39, wherein the sensor information includes temperature of the apparatus and voltage of the power source, and the parameter values include frequency, channel information, and coefficient values corresponding to the temperature, the voltage of the power source, the frequency and the channel information.