Dynamic power amplifier backoff using headroom information

• US 9,144,036 B2
• Filed: 01/31/2013
• Issued: 09/22/2015
• Est. Priority Date: 10/26/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gorokhov, Alexei Yurievitch, Borran, Jaber Mohammad, Agrawal, Avneesh, Bhushan, Naga, Kadous, Tamer Adel, Naguib, Ayman Fawzy
• Primary Examiner(s): Yao, Kwang B
• Assistant Examiner(s): NGO, NGUYEN HOANG
• Application Number:
  US13/755,285
• Publication Number:
  US 20130142154A1
• Time in Patent Office: 964 Days
• Field of Search: 370/229, 370/230, 370/236, 370/310, 370/311, 370/328, 370/329
• US Class Current: 1/1
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0058 Allocation criteria
• CPC Class Codes: H04W 52/04 TPC
• CPC Class Codes: H04W 52/30 using constraints in the total amount of available transmission power
• CPC Class Codes: H04W 72/563 of the wireless resources
• CPC Class Codes: Y02B 30/00 Energy efficient heating, ventilation or air conditioning [HVAC]

Abstract

Systems and methodologies are described that facilitate mitigating effect of non-linear distortion from a power amplifier on a spectral mask margin. Power limit indications can be analyzed in scheduling mobile devices. Mobile devices with power limits can be scheduled on inner subbands. The power limits can be based at least in part on power amplifier headroom information. Other mobile devices can employ remaining portions of an allocated spectrum. Further, mobile devices can evaluate and establish a power amplifier backoff based upon the subband scheduling.

Claims

1. A method that facilitates dynamically adjusting power amplifier backoff, comprising:

transmitting a periodic power headroom measurement corresponding to a maximum achievable transmit power;

transmitting power limitation indicators, the power limitation indicators including location within a given sector or cell and/or location information relative to more than one sector or cell;

advertising static differential power headroom corresponding to one or more points of interest; and

receiving a subband assignment based on the periodic power headroom measurement, the static differential power headroom, and the power limitation indicators.

2. The method of claim 1, wherein the points of interest comprise an inner subband, an edge subband, and/or a single base node.

3. The method of claim 1, further comprising:

evaluating a power amplifier backoff based at least in part on the received subband assignment; and

adjusting a power amplifier according to the evaluated backoff.

4. The method of claim 3, wherein evaluating a power amplifier backoff comprises determining a low backoff when the subband assignment indicates allocation to an inner subband of allocated spectrum.

5. The method of claim 3, wherein evaluating a power amplifier backoff comprises determining a high backoff when the subband assignment indicates allocation to an edge subband of allocated spectrum.

6. A wireless communications apparatus, comprising:

at least one processor configured to transmit a periodic power headroom measurement corresponding to a maximum achievable transmit power and advertise static differential power headroom corresponding to one or more points of interest, to transmit power limitation indicators, the power limitation indicators including location within a given sector or cell and/or location information relative to more than one sector or cell, and to receive a subband assignment based on the periodic power headroom measurement, the static differential power headroom, and the power limitation indicators; and

a memory coupled to the at least one processor.

7. The wireless communications apparatus of claim 6, the at least one processor further configured to evaluate a power amplifier backoff based at least in part on a received subband assignment and change a power amplifier based upon the evaluated backoff.

8. The wireless communications apparatus of claim 6, wherein the points of interest comprise an inner subband, an edge subband, and/or a single base node.

9. A wireless communications apparatus that mitigates non-linear distortion on spectral mask margin, comprising:

means for transmitting a periodic power headroom measurement corresponding to a maximum achievable transmit power for a broadband assignment;

means for transmitting power limitation indicators, the power limitation indicators including location within a given sector or cell and/or location information relative to more than one sector or cell;

means for advertising static differential power headroom corresponding to one or more points of interest; and

means for receiving a subband assignment based on the periodic power headroom measurement, the static differential power headroom, and the power limitation indicators.

11. The wireless communications apparatus of claim 9, wherein the points of interest comprise an inner subband, an edge subband, and/or a single base node.

12. The wireless communications apparatus of claim 9, further comprising means for receiving a subband assignment.

13. The wireless communications apparatus of claim 12, further comprising:

means for determining a power amplifier backoff based at least in part on the received subband assignment; and

means for adjusting a power amplifier according to the determined backoff.

14. The wireless communications apparatus of claim 13, wherein means for determining a power amplifier backoff comprises determining a low backoff when the subband assignment indicates allocation to an inner subband of allocated spectrum.

15. The wireless communications apparatus of claim 13, wherein means for determining a power amplifier backoff comprises determining a high backoff when the subband assignment indicates allocation to an edge subband of allocated spectrum.

10. The wireless communications apparatus 9, further comprising means for transmitting power limitation information.

16. A non-transitory computer-readable medium embedded with a computer executable program comprising:

code for causing at least one computer to transmit a periodic power headroom measurement corresponding to a maximum achievable transmit power;

code for transmitting power limitation indicators, the power limitation indicators including location within a given sector or cell and/or location information relative to more than one sector or cell;

code for causing the at least one computer to advertise static differential power headroom corresponding to one or more points of interest; and

code for causing the at least one computer to receive a subband assignment based on the periodic power headroom measurement, the static differential power headroom, and the power limitation indicators.

17. The non-transitory computer-readable medium of claim 16, wherein the points of interest comprise an inner subband, an edge subband, and/or a single base node.

18. A wireless communication apparatus, comprising:

a processor configured to;

transmit a periodic power headroom measurement corresponding to a maximum achievable transmit power for a broadband assignment;

transmit power limitation indicators, the power limitation indicators including location within a given sector or cell and/or location information relative to more than one sector or cell;

advertise static differential power headroom corresponding to one or more points of interest; and

receive a subband assignment based on the periodic power headroom measurement, the static differential power headroom, and the power limitation indicators; and

a memory coupled to the processor.