SYSTEMS AND METHODS FOR DYNAMIC TRANSMISSION POWER LIMIT BACK-OFF FOR SPECIFIC ABSORPTION RATE COMPLIANCE

• US 20120270592A1
• Filed: 03/02/2012
• Published: 10/25/2012
• Est. Priority Date: 03/04/2011
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Ngai, Francis Ming-Meng, Forrester, John A., Pandey, Anshul, Bhattacharjee, Supratik, Vaidyanathan, Rema, George, Brian Michael, Ji, Zhu
• Granted Patent: US 8,909,282 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 52/226 using past references to control power, e.g. look-up-table
• CPC Class Codes: H04W 52/228 using past power values or information
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/288 taking into account the usage mode, e.g. hands-free, data transmission, telephone
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range

Abstract

This disclosure provides systems, methods and apparatus for providing transmission power limit back-off for Specific Absorption Rate (SAR) compliance. In one aspect, a method implemented in a wireless communication apparatus is provided. The method includes receiving an indication of at least one operating mode indicative of a proximity and an orientation of at least one transmitting antenna of the wireless communication apparatus. The method further includes selecting from a plurality of transformations associated with the at least one operating mode. The method further includes applying a selected transformation to adjust a relationship between a power transmission level of a first transmitter and a power transmission level of a second transmitter. The method further includes determining a target power transmission level of the first transmitter based on the adjusted relationship and a current power transmission level of the second transmitter.

Claims

1. A method implemented in a wireless communication apparatus, comprising:

receiving an indication of at least one operating mode indicative of a proximity and an orientation of at least one transmitting antenna of the wireless communication apparatus;

selecting from a plurality of transformations associated with the at least one operating mode;

applying a selected transformation to adjust a relationship between a power transmission level of a first transmitter and a power transmission level of a second transmitter; and

determining a target power transmission level of the first transmitter based on the adjusted relationship and a current power transmission level of the second transmitter.

2. The method of claim 1, wherein the first transmitter and the second transmitter are configured to transmit simultaneously.

3. The method of claim 1, wherein the relationship is defined using at least one first look up table, and wherein the plurality of transformations is defined by at least one second look up table.

4. The method of claim 1, wherein the second transmitter is associated with a priority tier, and wherein the selected transformation is selected based on the priority tier.

5. The method of claim 1, wherein the second transmitter and a third transmitter are associated with a priority tier, and wherein the selected transformation is selected based on the priority tier.

6. The method of claim 1, wherein determining a target power transmission level further comprises determining the target power transmission level based on at least one of a radio access technology type, a band-class, a transmission configuration, an uplink channel, a traffic state, and a radio access technology transmission state used by the wireless communication apparatus, or any combination thereof.

7. The method of claim 6, wherein the radio access technology type corresponds to at least one of a wireless wide area network, a wireless local area network, a wireless network for sending voice communications, a wireless network for sending data communications, or any combination thereof.

8. The method of claim 1, wherein the at least one transmitting antenna comprises one of a first transmitting antenna or a second transmitting antenna, wherein the first transmitter is configured to transmit via the first transmitting antenna, and wherein the second transmitter is configured to transmit via the second transmitting antenna.

9. The method of claim 8, wherein the transmission power level is determined so that the first transmitting antenna and the second transmitting antenna do not exceed a specific absorption rate (SAR) threshold.

10. The method of claim 1, wherein the at least one operating mode is further indicative of at least one of a mobile hotspot being activated and a type of call, or any combination thereof.

11. A wireless communication apparatus, comprising:

at least one transmitting antenna;

a first transmitter;

a second transmitter; and

a processor configured to;

receive an indication of at least one operating mode indicative of a proximity and an orientation of the at least one transmitting antenna;

select from a plurality of transformations associated with the at least one operating mode;

apply a selected transformation to adjust a relationship between a power transmission level of the first transmitter and a power transmission level of the second transmitter; and

determine a target power transmission level of the first transmitter based on the adjusted relationship and a current power transmission level of the second transmitter.

12. The wireless communication apparatus of claim 11, wherein the first transmitter and the second transmitter are configured to transmit simultaneously.

13. The wireless communication apparatus of claim 11, further comprising a memory configured to store at least one first look up table defining the relationship, and wherein the memory if further configured to store at least one second look up table defining the plurality of transformations.

14. The wireless communication apparatus of claim 11, wherein the second transmitter is associated with a priority tier, and wherein the selected transformation is selected based on the priority tier.

15. The wireless communication apparatus of claim 11, further comprising a third transmitter, wherein the second transmitter and the third transmitter are associated with a priority tier, and wherein the selected transformation is selected based on the priority tier.

16. The wireless communication apparatus of claim 11, wherein the processor is further configured to determine a target power transmission level further based on at least one of a radio access technology type, a band-class, a transmission configuration, an uplink channel, a traffic state, and a radio access technology transmission state used by the wireless communication apparatus, or any combination thereof.

17. The wireless communication apparatus of claim 16, wherein the radio access technology type corresponds to at least one of a wireless wide area network, a wireless local area network, a wireless network for sending voice communications, a wireless network for sending data communications, or any combination thereof.

18. The wireless communication apparatus of claim 11, wherein the at least one transmitting antenna comprises one of a first transmitting antenna or a second transmitting antenna, wherein the first transmitter is configured to transmit via the first transmitting antenna, and wherein the second transmitter is configured to transmit via the second transmitting antenna.

19. The wireless communication apparatus of claim 18, wherein the transmission power level is determined so that the first transmitting antenna and the second transmitting antenna do not exceed a specific absorption rate (SAR) threshold.

20. The wireless communication apparatus of claim 11, wherein the at least one operating mode is further indicative of at least one of a mobile hotspot being activated and a type of call, or any combination thereof.

21. A wireless communication apparatus, comprising:

means for receiving an indication of at least one operating mode indicative of a proximity and an orientation of at least one transmitting antenna of the wireless communication apparatus;

means for selecting from a plurality of transformations associated with the at least one operating mode;

means for applying a selected transformation to adjust a relationship between a power transmission level of a first transmitter and a power transmission level of a second transmitter; and

means for determining a target power transmission level of the first transmitter based on the adjusted relationship and a current power transmission level of the second transmitter.

22. The wireless communication apparatus of claim 21, wherein the first transmitter and the second transmitter are configured to transmit simultaneously.

23. The wireless communication apparatus of claim 21, wherein the relationship is defined using at least one first look up table, and wherein the plurality of transformations is defined by at least one second look up table.

24. The wireless communication apparatus of claim 21, wherein the second transmitter is associated with a priority tier, and wherein the selected transformation is selected based on the priority tier.

25. The wireless communication apparatus of claim 21, wherein the second transmitter and a third transmitter are associated with a priority tier, and wherein the selected transformation is selected based on the priority tier.

26. The wireless communication apparatus of claim 21, wherein the means for determining a target power transmission level further comprises means for determining the target power transmission level based on at least one of a radio access technology type, a band-class, a transmission configuration, an uplink channel, a traffic state, and a radio access technology transmission state used by the wireless communication apparatus, or any combination thereof.

27. The wireless communication apparatus of claim 26, wherein the radio access technology type corresponds to at least one of a wireless wide area network, a wireless local area network, a wireless network for sending voice communications, a wireless network for sending data communications, or any combination thereof.

28. The wireless communication apparatus of claim 21, wherein the at least one transmitting antenna comprises one of a first transmitting antenna or a second transmitting antenna, wherein the first transmitter is configured to transmit via the first transmitting antenna, and wherein the second transmitter is configured to transmit via the second transmitting antenna.

29. The wireless communication apparatus of claim 28, wherein the transmission power level is determined so that the first transmitting antenna and the second transmitting antenna do not exceed a specific absorption rate (SAR) threshold.

30. The wireless communication apparatus of claim 21, wherein the at least one operating mode is further indicative of at least one of a mobile hotspot being activated and a type of call, or any combination thereof.

31. The wireless communication apparatus of claim 21, wherein the means for receiving, the means for selecting, the means for applying, and the means for determining a target power transmission level comprise a processor.

32. A computer program product, comprising:

a computer-readable medium comprising;

code for receiving an indication of at least one operating mode indicative of a proximity and an orientation of at least one transmitting antenna of a wireless communication apparatus;

code for selecting from a plurality of transformations associated with the at least one operating mode;

code for applying a selected transformation to adjust a relationship between a power transmission level of a first transmitter and a power transmission level of a second transmitter; and

code for determining a target power transmission level of the first transmitter based on the adjusted relationship and a current power transmission level of the second transmitter.

33. The computer program product of claim 32, wherein the first transmitter and the second transmitter are configured to transmit simultaneously.

34. The computer program product of claim 32, wherein the relationship is defined using at least one first look up table, and wherein the plurality of transformations is defined by at least one second look up table.

35. The computer program product program product of claim 32, wherein the second transmitter is associated with a priority tier, and wherein the selected transformation is selected based on the priority tier.

36. The computer program product of claim 32, wherein the second transmitter and a third transmitter are associated with a priority tier, and wherein the selected transformation is selected based on the priority tier.

37. The computer program product of claim 32, wherein the code for determining a target power transmission level further comprises code for determining the target power transmission level based on at least one of a radio access technology type, a band-class, a transmission configuration, an uplink channel, a traffic state, and a radio access technology transmission state used by the wireless communication apparatus, or any combination thereof.

38. The computer program product of claim 37, wherein the radio access technology type corresponds to at least one of a wireless wide area network, a wireless local area network, a wireless network for sending voice communications, a wireless network for sending data communications, or any combination thereof.

39. The computer program product of claim 32, wherein the at least one transmitting antenna comprises one of a first transmitting antenna or a second transmitting antenna, wherein the first transmitter is configured to transmit via the first transmitting antenna, and wherein the second transmitter is configured to transmit via the second transmitting antenna.

40. The computer program product of claim 39, wherein the transmission power level is determined so that the first transmitting antenna and the second transmitting antenna do not exceed a specific absorption rate (SAR) threshold.

41. The computer program product of claim 32, wherein the at least one operating mode is further indicative of at least one of a mobile hotspot being activated and a type of call, or any combination thereof.