Adaptive average power tracking
Exemplary embodiments of the invention include a request received to change a TX output power setting or a frequency channel setting. In response, the requested TX output power setting is used to generate a TX output signal in the proper frequency channel. Handset circuitry makes OOB power measurements, the results of which are used to determine a VCC 2 setting. The VCC 2 setting is a setting that results in an MPS requirement just being met. The VCC 2 setting is stored in association with the TX output power and frequency channel setting. The determined VCC 2 setting is also used to set the VCC 2 supply voltage for the power amplifier. Once set, VCC 2 remains fixed until the next request. Each individual handset uses this Adaptive Average Power Tracking (AAPT) method, thereby reducing its VCC 2 voltage during operation and conserving power. Because each handset uses AAPT, factory calibration to account for unit-to-unit variations in transmitter circuitry performance is avoided.
1. A method comprising:
(a) receiving a request to change a transmitter (TX) output power setting of a mobile communication device to a new TX output power setting;
(b) generating a transmitter (TX) output signal when the mobile communication device is configured with the new TX output power setting;
(c) measuring an Out-Of-Band (OOB) power on the mobile communication device when the mobile communication device is generating the TX output signal;
(d) determining a VCC 2 setting based at least in part on the OOB power measuring;
(e) using the determined VCC 2 setting to set a VCC 2 supply voltage supplied to a power amplifier; and
(f) keeping the VCC 2 supply voltage to substantially fixed until another request to change the TX output power setting is received.
2. The method of claim 1 , wherein the request received in (a) is received onto the mobile communication device from a base station as part of a first wireless communication, and wherein said another request in (f) is received onto the mobile communication device as part of a second wireless communication.
3. The method of claim 1 , wherein (a), (b), (c), (d), (e) and (f) are performed by the mobile communication device.
4. The method of claim 3 , further comprising:
(g) generating the request in (a) in response to an over-temperature condition, wherein (g) occurs before the receiving of the request in (a), and wherein (g) is also performed by the mobile communication device.
5. The method of claim 1 , wherein the VCC 2 setting determined in (d) is a setting that results in the mobile communication device having a linearity that is within a predetermined threshold of a Minimum Performance Standards (MPS) linearity requirement.
6. The method of claim 1 , wherein the VCC 2 setting determined in (d) is a setting that results in the mobile communication device having a linearity that is approximately equal to a Minimum Performance Standards (MPS) linearity requirement.
7. The method of claim 1 , wherein the VCC 2 setting determined in (d) is a setting that results in the mobile communication device generating an amount of OOB power that is approximately equal to a maximum amount of OOB power allowed for Minimum Performance Standards (MPS) compliance.
8. The method of claim 1 , wherein the VCC 2 setting determined in (d) is a setting that results in the mobile communication device exhibiting a performance that has a predetermined relationship to respect to a Minimum Performance Standards (MPS) requirement.
9. The method of claim 1 , further comprising:
(g) storing a plurality of VCC 2 settings in the mobile communication device, wherein each VCC 2 setting is stored in association with a corresponding TX output power setting.
10. The method of claim 1 , further comprising:
(g) storing a plurality of VCC 2 settings in the mobile communication device, wherein each VCC 2 setting is stored in association with a corresponding TX output power setting, and wherein the VCC 2 setting determined in (d) is stored in association with the new TX output power setting.
11. The method of claim 1 , wherein the VCC 2 setting determined in (d) is stored in association with the new TX output power setting, and wherein this storing occurs as a result of the receiving of the request in (a).
12. The method of claim 1 , wherein (a), (b), (c), (d), (e) and (f) are performed by a digital baseband processor integrated circuit within the mobile communication device, wherein the using of (e) is a causing of a power supply circuit to supply the VCC 2 supply voltage to the power amplifier, wherein the causing of (f) is a causing of the power supply circuit to continue to supply the VCC 2 supply voltage to the power amplifier, and wherein the power supply circuit is not a part of the digital baseband processor integrated circuit.
13. The method of claim 1 , wherein the power amplifier is a power amplifier integrated circuit, wherein the power amplifier integrated circuit has a first terminal that receives a VCC 1 supply voltage, and wherein the power amplifier integrated circuit has a second terminal that receives the VCC 2 supply voltage.
14. An apparatus, comprising:
a memory; and
means for: (a) receiving a request to change a transmitter (TX) output power setting to a new TX output power setting, (b) generating a transmitter (TX) output signal when the mobile communication device is configured with the new TX output power setting, (c) measuring an Out-Of-Band (OOB) power when the mobile communication device is generating the TX output signal, (d) determining a VCC 2 setting based at least in part on the OOB power measurement, (e) using the determined VCC 2 setting to set a VCC 2 supply voltage supplied to a power amplifier, and (f) keeping the VCC 2 supply voltage substantially fixed until another request to change the TX output power setting is received.
15. The apparatus of claim 14 , wherein the apparatus is a digital baseband processor integrated circuit, wherein the memory stores a plurality of VCC 2 settings, wherein each VCC 2 setting is stored in association with a corresponding TX output power setting, and wherein the VCC 2 setting determined by the means based at least in part on the OOB power measurement is a VCC 2 setting stored in association with the new TX output power setting.
16. The apparatus of claim 15 , further comprising:
means for storing the VCC 2 setting that is determined based at least in part on the OOB power measurement on the apparatus in association with the new TX output power setting.
17. A method comprising:
(a) receiving a request to change a transmitter (TX) output power setting of a mobile communication device to a new TX output power setting;
(b) using the new TX output power setting to look up a VCC 2 setting stored in the mobile communication device, wherein the VCC 2 setting looked up corresponds to the new TX output power setting;
(c) using the looked up VCC 2 setting to set a VCC 2 supply voltage supplied to a power amplifier of the mobile communication device; and
(d) keeping the VCC 2 supply voltage fixed until another request to change the TX output power setting is received.
18. The method of claim 17 , wherein the mobile communication device stores a plurality of VCC 2 settings, wherein each VCC 2 setting stored is stored in association with a corresponding TX output power setting.
19. The method of claim 17 , wherein each VCC 2 setting stored is stored in association with a combination of a TX output power setting and a frequency channel setting.
20. A processor-readable medium storing a set of processor-executable instructions, wherein execution of the set of processor-executable instructions by a processor is for:
(a) in response to a receiving of a request to change a transmitter (TX) output power setting of a mobile communication device to a new TX output power setting, causing the mobile communication device to generate a transmitter (TX) output signal when the mobile communication device is configured with the new TX output power setting;
(b) measuring an Out-Of-Band (OOB) power on the mobile communication device when the mobile communication device is generating the TX output signal;
(c) determining a VCC 2 setting based at least in part on the OOB power measurement;
(d) using the determined VCC 2 setting to set a VCC 2 supply voltage supplied to a power amplifier; and
(e) keeping the VCC 2 supply voltage substantially fixed until another request to change the TX output power setting is received.