Uplink power control for wireless communication
Certain aspects of the present disclosure provide closed loop and open loop power control techniques for each antenna of the user equipment (UE). The access point may measure the received signals from each antenna of the user equipment, calculate a power adjustment parameter for each antenna of the UE, and transmit the parameters to the UE. The UE may use the adjustment parameters to determine the transmit power value for each antenna. In addition, the UE may measure the path loss for each antenna and update the transmit power per antenna based on the path loss and other parameters.
1. A method for wireless communications, comprising:
receiving power adjustment parameters for a subset of antennas, wherein the power adjustment parameters comprise a common power adjustment parameter for all of the antennas of the subset of antennas and a relative power adjustment parameter for each of the antennas of the subset of antennas;
calculating values of transmit power for the subset of antennas using the received common power adjustment parameter and the received relative power adjustment parameter associated with each of the antennas; and
transmitting signals from the subset of antennas using power based on the calculated values of transmit power.
2. The method of claim 1 , further comprising:
adjusting the calculated values of transmit power for the subset of antennas based on the value of path loss in signals received by each antenna.
3. The method of claim 1 , further comprising:
determining the subset of antennas from which to transmit signals based at least on an optimization of power consumption.
4. The method of claim 1 , further comprising:
receiving information about the subset of antennas;
calculating values of transmit power for the subset of antennas using the received power adjustment parameters associated with each of the antennas; and
adjusting the subset of antennas from which to transmit signals and the transmit power for the subset of antennas based on the calculated values.
5. The method of claim 1 , wherein N T power adjustment parameters are received for N T antennas, one for each antenna.
6. The method of claim 1 , wherein N T −1 power adjustment parameters are received for N T −1 antennas, relative to one of the antennas that is not included in the N T −1 antennas.
7. The method of claim 1 , wherein dynamic range of the common power adjustment parameter is larger than dynamic range of the relative power adjustment parameters.
8. The method of claim 1 , wherein rate of update for the common power adjustment parameter and the relative power adjustment parameters are different.
9. The method of claim 1 , wherein granularity of the common power adjustment parameter and the relative power adjustment parameters are different.
10. An apparatus for wireless communications, comprising:
logic for receiving power adjustment parameters for a subset of antennas, wherein the power adjustment parameters comprise a common power adjustment parameter for all of the antennas of the subset of antennas and a relative power adjustment parameter for each of the antennas of the subset of antennas;
logic for calculating values of transmit power for the subset of antennas using the received common power adjustment parameter and the received relative power adjustment parameter associated with each of the antennas; and
logic for transmitting signals from the subset of antennas using power based on the calculated values of transmit power.
11. The apparatus of claim 10 , further comprising:
logic for adjusting the calculated values of transmit power for the subset of antennas based on the value of path loss in signals received by each antenna.
12. The apparatus of claim 10 , further comprising:
logic for determining the subset of antennas from which to transmit signals based at least on an optimization of power consumption.
13. The apparatus of claim 10 , further comprising:
logic for receiving information about the subset of antennas;
logic for calculating values of transmit power for the subset of antennas using the received power adjustment parameters associated with each of the antennas; and
logic for adjusting the subset of antennas from which to transmit signals and the transmit power for the subset of antennas based on the calculated values.
14. The apparatus of claim 10 , wherein N T power adjustment parameters are received for N T antennas, one for each antenna.
15. The apparatus of claim 10 , wherein N T −1 power adjustment parameters are received for N T −1 antennas, relative to one of the antennas that is not included in the N T −1 antennas.
16. The apparatus of claim 10 , wherein dynamic range of the common power adjustment parameter is larger than dynamic range of the relative power adjustment parameters.
17. The apparatus of claim 10 , wherein rate of update for the common power adjustment parameter and the relative power adjustment parameters are different.
18. The apparatus of claim 10 , wherein granularity of the common power adjustment parameter and the relative power adjustment parameters are different.
19. An apparatus for wireless communications, comprising:
means for receiving power adjustment parameters for a subset of antennas, wherein the power adjustment parameters comprise a common power adjustment parameter for all of the antennas of the subset of antennas and a relative power adjustment parameter for each of the antennas of the subset of antennas;
means for calculating values of transmit power for the subset of antennas using the received common power adjustment parameter and the received relative power adjustment parameter associated with each of the antennas; and
means for transmitting signals from the subset of antennas using power based on the calculated values of transmit power.
20. A computer-program product for wireless communications, comprising a non-transitory computer readable medium having instructions stored thereon, the instructions being executable by one or more processors and the instructions comprising:
instructions for receiving power adjustment parameters for a subset of antennas, wherein the power adjustment parameters comprise a common power adjustment parameter for all of the antennas of the subset of antennas and a relative power adjustment parameter for each of the antennas of the subset of antennas;
instructions for calculating values of transmit power for the subset of antennas using the received common power adjustment parameter and the received relative power adjustment parameter associated with each of the antennas; and
instructions for transmitting signals from the subset of antennas using power based on the calculated values of transmit power.
21. An apparatus for wireless communications, comprising at least one processor configured to:
receive power adjustment parameters for a subset of antennas, wherein the power adjustment parameters comprise a common power adjustment parameter for all of the antennas of the subset of antennas and a relative power adjustment parameter for each of the antennas of the subset of antennas;
calculate values of transmit power for the subset of antennas using the received common power adjustment parameter and the received relative power adjustment parameter associated with each of the antennas; and
transmit signals from the subset of antennas using power based on the calculated values of transmit power.