PREDICTIVE TRANSMISSION POWER CONTROL FOR BACK-OFF

• US 20160098053A1
• Filed: 10/03/2014
• Published: 04/07/2016
• Est. Priority Date: 10/03/2014
• Status: Active Grant

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Khawand, Charbel, Mercer, Sean
• Granted Patent: US 9,785,174 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G05F 3/02 Regulating voltage or current
• CPC Class Codes: H04W 52/281 taking into account user or data type priority
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/362 Aspects of the step size
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range

Abstract

An electronic device disclosed herein includes mechanisms for modeling and dynamically controlling transmission power of an electronic device. The electronic device determines a back-off function defining at least one transmission power adjustment that is effective to adjust a predicted average energy emanating from an electronic device over the future time interval to satisfy a power condition. Power of the electronic device is adjusted according to the back-off function responsive to satisfaction of a proximity condition.

Claims

1. A method comprising:

determining a back-off function defining at least one transmission power adjustment, the at least one transmission power adjustment effective to adjust a predicted average energy of an electronic device over a future time interval to satisfy a power condition; and

adjusting transmission power of the electronic device according to the back-off function responsive to satisfaction of a proximity condition.

2. The method of claim 1 wherein the back-off function is a step function.

3. The method of claim 1 wherein the back-off function prioritizes critical transmissions over non-critical transmissions.

4. The method of claim 1 wherein the back-off function maximizes a total average energy emanating from the electronic device while controlling the predicted average energy to satisfy the power condition.

5. The method of claim 1 further comprising:

defining the power condition based on a type of object triggering the proximity event.

6. The method of claim 1 further comprising:

defining the power condition based on a geographical location of the electronic device provided by a global positioning system (GPS).

7. The method of claim 1 further comprising:

predicting the average energy based on channel conditions.

8. The method of claim 1 further comprising:

predicting the average energy based on at least one of a current channel activity and a scheduled channel activity.

9. An apparatus including:

a back-off module that determines a back-off function defining at least one transmission power adjustment, the at least one transmission power adjustment effective to adjust a predicted average energy of an electronic device over a future time interval to satisfy a power condition; and

a power controller that adjusts power of at least one transmitter of the electronic device according to the back-off function.

10. The apparatus of claim 9 wherein the back-off function has a variable step size.

11. The apparatus of claim 9, wherein the back-off module dynamically adjusts the back-off function throughout the future time interval.

12. The apparatus of claim 9 wherein the back-off function prioritizes critical transmissions over non-critical transmissions.

13. The apparatus of claim 9 wherein the non-linear back-off function maximizes a total energy emanating from the electronic device while adjusting the predicted average energy to satisfy the power condition.

14. The apparatus of claim 9 wherein the back-off module predicts the average energy based on at least one of a current channel activity and a scheduled channel activity.

15. The apparatus of claim 9 wherein the back-off module predicts the average energy based on observed channel conditions.

16. The apparatus of claim 9 wherein the back-off module defines the power condition based on a type of object triggering the proximity event.

17. The apparatus of claim 9 wherein the back-off module defines the power condition based on a geographical location of the electronic device provided by a global positioning system (GPS).

18. A method comprising:

determining a back-off step function with a variable step size, the back-off step function defining at least one transmission power adjustment effective to adjust a predicted average energy of an electronic device over a future time interval to satisfy a power condition while maximizing total transmission power of the electronic device over the future time interval; and

adjusting the transmission power according to the back-off step function responsive to detection of a proximity event.

19. The method of claim 18 wherein the back-off step function minimizes transmission power reductions that occur during critical transmissions.

20. The method of claim 19 wherein determining the back-off step function further comprises:

determining the back-off step function based on at least one of channel conditions and channel activities.