Dynamic power scaling of digital modems
A system and method dynamically scale power consumed by the circuitry of an electronic device based on channel state and/or data rate. The electronic device then operates according to the power scaling. The scaling may be in accordance with an effective data rate, a number of multiple input multiple output (MIMO) layers, receiver type, a cell scenario, or a number of carriers. A number of MIMO layers can be predicted based on at least one of channel conditions or a channel quality index (CQI).
1. A method of wireless communication, comprising:
predicting future data rates based at least in part on a number of multiple input multiple output (MIMO) layers, a receiver type, a cell scenario, a number of carriers, an effective data rate, or a combination thereof, and the cell scenario comprising at least a number of transmission antennas, or a MIMO mode, or a combination thereof; and
dynamically scaling power consumed by circuitry of an electronic device by scaling voltage and frequency based at least in part on the predicted future data rates.
2. The method according to claim 1 , wherein the frequency is dynamically scaled by applying subdivider ratios.
3. The method of claim 1 , in which the predicted future data rates are predicted based at least in part on a pre-computed table or a mathematical formula.
4. The method of claim 1 , further comprising determining a number of MIMO layers based at least in part on at least channel conditions, a channel quality index (CQI), or a combination thereof.
5. The method of claim 1 , further comprising dynamically scaling voltage and frequency separately for a plurality of components of the circuitry.
6. The method of claim 1 , in which the dynamically scaling further comprises powering down at least one circuit.
7. The method of claim 6 , in which the powering down at least one circuit further comprises driving power collapse switches.
8. The method of claim 1 , in which the dynamically scaling further comprises tuning power rails.
9. The method of claim 1 , in which the channel state corresponds to a channel quality indicator (CQI) index value reported by a user equipment (UE).
10. The method of claim 1 , further comprising predicting the effective data rate based at least in part on a CQI, a current data rate, a previous data rate, or a combination thereof.
11. An apparatus for wireless communication, comprising:
a memory; and
at least one processor coupled to the memory, the at least one processor being configured:
to predict future data rates based at least in part on a number of multiple input multiple output (MIMO) layers, a receiver type, a cell scenario, a number of carriers, an effective data rate, or a combination thereof, and the cell scenario comprising at least a number of transmission antennas, or a MIMO mode, or a combination thereof; and
to dynamically scale power consumed by circuitry of an electronic device by scaling voltage and frequency based at least in part on the predicted future data rates.
12. The apparatus of claim 11 , wherein the frequency is dynamically scaled by applying subdivider ratios.
13. The apparatus of claim 11 , in which the predicted future data rates are predicted based at least in part on a pre-computed table or a mathematical formula.
14. The apparatus of claim 11 , in which the at least one processor is further configured to determine a number of MIMO layers based at least in part on at least channel conditions, a channel quality index (CQI), or a combination thereof.
15. The apparatus of claim 11 , in which the at least one processor is further configured to dynamically scale voltage and frequency separately for a plurality of components of the circuitry.
16. The apparatus of claim 11 , in which the at least one processor is further configured to dynamically scale by powering down at least one circuit.
17. The apparatus of claim 16 , in which the at least one processor is further configured to power down at least one circuit by driving power collapse switches.
18. The apparatus of claim 11 , in which the at least one processor is further configured to dynamically scale by tuning power rails.
19. The apparatus of claim 11 , in which the channel state corresponds to a channel quality indicator (CQI) index value reported by a user equipment (UE).
20. The apparatus of claim 11 , in which the at least one processor is further configured to predict the effective data rate based at least in part on a CQI, a current data rate, a previous data rate, or a combination thereof.
21. A non-transitory computer-readable medium having non-transitory program code recorded thereon, the program code comprising:
program code to predict future data rates based at least in part on a number of multiple input multiple output (MIMO) layers, a receiver type, a cell scenario, a number of carriers, an effective data rate, or a combination thereof, a previous data rate, or combination thereof, and the cell scenario comprising at least a number of transmission antennas, or a MIMO mode, or a combination thereof; and
program code to dynamically scale power consumed by circuitry of an electronic device by scaling voltage and frequency based at least in part on the predicted future data rates.
22. An apparatus for wireless communication, comprising:
means for predicting future data rates based at least in part on a number of multiple input multiple output (MIMO) layers, a receiver type, a cell scenario, a number of carriers, an effective data rate, or a combination thereof, and the cell scenario comprising at least a number of transmission antennas, or a MIMO mode, or a combination thereof;
means for dynamically scaling power consumed by circuitry of an electronic device by scaling voltage and frequency based at least in part on the predicted future data rates; and
means for operating the electronic device according to the scaled power.