Transmission power management for a moblie device supporting simultaneous transmission on multiple air interfaces

1. A method for power management for a mobile device supporting simultaneous transmission on multiple air interfaces, the method comprising:

determining a first power level used for transmission over a first air interface;

determining a second power level used for transmission over a second air interface;

comparing a composite of the first power level and the second power level to a threshold power level;

adjusting the second power level based on the comparison;

generating at least one power head room report based on at least one of the first power level and the adjusted second power level; and

transmitting the at least one power head room report.

2. The method of claim 1 , wherein adjusting the second power level comprises adjusting the second power level so the sum of the first power level and the second power level is less than or equal to the threshold power level.

3. The method of claim 1 , further comprising adjusting the first power level based on the comparison, and wherein the composite of the adjusted first power level and the adjusted second power level is less than or equal to the threshold power level.

4. The method of claim 1 , wherein the first air interface is prioritized over the second air interface for power allocation.

5. The method of claim 1 , wherein transmitting the at least one power head room report, comprises transmitting a first power head room report over the first air interface and transmitting a second power head room report over the second air interface.

6. A mobile device supporting simultaneous transmission on multiple air interfaces, the mobile device comprising:

a first interface power calculator configured to determine a first power level used for transmission over a first air interface;

a second interface power level calculator configured to determine a second power level used for transmission over a second air interface;

a threshold check unit configured to compare a composite of the first power level and the second power level to a threshold power level;

a power controller configured to adjust the second power level based on the comparison;

a power based payload constraint generator configured to generate at least one power head room report based on at least one of the first power level and the adjusted second power level; and

at least one transceiver configured to transmit the at least one power head room report.

7. The mobile device of claim 6 , wherein the power controller is further configured to adjust the second power level by adjusting the second power level so the sum of the first power level and the second power level is less than or equal to the threshold power level.

8. The mobile device of claim 6 , wherein the power controller is further configured to adjust the first power level based on the comparison, and wherein the composite of the adjusted first power level and the adjusted second power level is less than or equal to the threshold power level.

9. The mobile device of claim 6 , wherein the first air interface is prioritized over the second air interface for power allocation.

10. The mobile device of claim 6 , wherein the at least one transceiver is further configured to transmit the at least one power head room report, comprises transmitting a first power head room report over the first air interface and transmitting a second power head room report over the second air interface.

11. A computer program product, comprising:

computer-readable medium comprising:

code for causing a computer to determine a first power level used for transmission over a first air interface;

code for causing a computer to determine a second power level used for transmission over a second air interface;

code for causing a computer to compare a composite of the first power level and the second power level to a threshold power level;

code for causing a computer to adjust the second power level based on the comparison;

code for causing a computer to generate at least one power head room report based on at least one of the first power level and the adjusted second power level; and

code for causing a computer to transmit the at least one power head room report.

12. A system for power management for a mobile device supporting simultaneous transmission on multiple air interfaces, the system comprising:

means for determining a first power level used for transmission over a first air interface;

means for determining a second power level used for transmission over a second air interface;

means for comparing a composite of the first power level and the second power level to a threshold power level;

means for adjusting the second power level based on the comparison;

means for generating at least one power head room report comprising based on at least one of the first power level and the adjusted second power level; and

means for transmitting the at least one power head room report.