Resource allocation in a communication system

• US 9,992,747 B2
• Filed: 07/17/2013
• Issued: 06/05/2018
• Est. Priority Date: 03/19/2007
• Status: Active Grant

• Current Assignee: Apple Inc.
• Original Assignee: Apple Inc.
• Inventors: Oteri, Oghenekome F., McCoy, James W.
• Primary Examiner(s): Phillips, Hassan
• Assistant Examiner(s): JONES, PRENELL P
• Application Number:
  US13/944,122
• Publication Number:
  US 20130301532A1
• Time in Patent Office: 1,784 Days
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/18 TPC being performed according to specific parameters
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/262 taking into account adaptive modulation and coding [AMC] scheme AMC per se H04L1/0001
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 52/54 Signalisation aspects of the TPC commands, e.g. frame structure

Abstract

Methods and corresponding systems for determining a transmit power in a wireless device include receiving, in the wireless device, a cell-wide power control parameter related to a target receive power at a serving base station. Thereafter, a transmit power is calculated in response to the cell-wide power control parameter and an implicit mobile-specific power control parameter. The wireless device then transmits using the transmit power. The cell-wide power control parameter can be a cell target signal to interference-plus-noise ratio, or a fractional power control exponent. The implicit mobile-specific power control parameter can be a modulation and coding level previously used by the wireless device, or a downlink SINR level measured by the wireless device.

Claims

1. A method for wireless communication power control comprising:

receiving a resource allocation request, where the resource allocation request is based at least in part on a power limitation of a wireless device;

at a first time, sending a dynamic power control instruction for execution by the wireless device during a duration of a dynamic resource allocation grant sent from a base station; and

at a second time, sending an initial power control instruction for initial execution by the wireless device during a duration of a persistent resource allocation grant sent from the base station, and sending subsequent power control instructions for subsequent execution by the wireless device during the duration of the persistent resource allocation grant.

2. The method of claim 1, wherein the sending subsequent power control instructions comprises sending adjustment instructions, wherein the adjustment instructions include one or more of an instruction to increment power and an instruction to decrement power.

3. The method of claim 1, further comprising:

sending a channel sounding request; and

receiving a channel sounding message in response to the channel sounding request.

4. The method of claim 3, wherein the resource allocation of at least one of the dynamic resource allocation grant and persistent resource allocation grant is based on data resulting from the channel sounding message and the resource allocation request.

5. The method of claim 1, wherein the resource allocation request is received in response to a resource utilization limitation of the mobile device exceeding a reporting threshold, wherein the resource utilization limitation is based on the power limitation.

6. The method of claim 5, wherein resource utilization limitation is a power headroom.

7. The method of claim 1, wherein the power control instruction is a mobile-specific power control parameter.

8. The method of claim 1, further comprising reducing a transmit power for the wireless device when an allocated number of resource blocks exceeds the maximum number of resource blocks for the wireless device, wherein the maximum number of resource blocks corresponds to a maximum power of the wireless device.

9. A base station, comprising:

a receiver configured to receive a resource allocation request based at least in part on a power limitation of a wireless device;

a transmitter configured to;

at a first time, send a dynamic power control instruction for execution by the wireless device during a duration of a dynamic resource allocation grant sent from the base station; and

at a second time, sending an initial power control instruction for initial execution by the wireless device during a duration of a persistent resource allocation grant sent from the base station, and sending subsequent power control instructions for subsequent execution by the wireless device during the duration of the persistent resource allocation grant.

10. The base station of claim 9, wherein the sending subsequent power control instructions comprises sending adjustment instructions, wherein the adjustment instructions include one or more of an instruction to increment power and an instruction to decrement power.

11. The base station of claim 9, wherein:

the transmitter is further configured to send a channel sounding request; and

the receiver is further configured to receive a channel sounding message in response to the channel sounding request.

12. The base station of claim 11, wherein the resource allocation of at least one of the dynamic resource allocation grant and persistent resource allocation grant is based on data resulting from the channel sounding message and the resource allocation request.

13. The base station of claim 9, wherein the power control instruction is a mobile-specific power control parameter.

14. A wireless device, comprising:

a receiver configured to;

at a first time, receive a dynamic power control instruction for execution by the wireless device during a duration of a dynamic resource allocation grant received from a base station; and

at a second time, receive an initial power control instruction for initial execution by the wireless device during a duration of a persistent resource allocation grant received from the base station, and receive subsequent power control instructions for subsequent execution by the wireless device during the duration of the persistent resource allocation grant; and

a transmitter configured to;

transmit a resource allocation request, where the resource allocation request is based at least in part on a power limitation of the wireless device;

transmit, after the first time, according to the dynamic resource allocation grant using the dynamic power control instruction; and

transmit, after the second time, according to the persistent resource allocation grant using the initial power control instruction.

15. The wireless device of claim 14, wherein the receiving subsequent power control instructions comprises receiving adjustment instructions, wherein the adjustment instructions include one or more of an instruction to increment power and an instruction to decrement power.

16. The wireless device of claim 14, wherein:

the receiver is further configured to receive a channel sounding request; and

the transmitter is further configured to transmit a channel sounding message in response to the channel sounding request.

17. The wireless device of claim 16, wherein the resource allocation of at least one of the dynamic resource allocation grant and the persistent resource allocation grant is based on data resulting from the channel sounding message and the resource allocation request.

18. The wireless device of claim 14, wherein the resource allocation request is received in response to a resource utilization limitation of the mobile device exceeding a reporting threshold, wherein the resource utilization limitation is based on the power limitation.

19. The wireless device of claim 18, wherein resource utilization limitation is a power headroom.

20. The wireless device of claim 14, wherein the power control instruction is a mobile-specific power control parameter.

21. The wireless device of claim 14, wherein the transmitter is further configured to reduce a transmit power for the wireless device when an allocated number of resource blocks exceeds a maximum number of resource blocks for the wireless device, wherein the maximum number of resource blocks corresponds to a maximum power of the wireless device.

22. A apparatus for wireless communication power control in a wireless device, the apparatus comprising:

at least one memory storing software instructions;

a processor configured to execute the software instructions, causing the wireless device to;

transmit a resource allocation request, where the resource allocation request is based at least in part on a power limitation of the wireless device;

at a first time, receive a dynamic power control instruction for execution by the wireless device during a duration of a dynamic resource allocation grant received from a base station;

transmit according to the dynamic resource allocation grant using the dynamic power control instruction;

at a second time, receiving an initial power control instruction for initial execution by the wireless device during a duration of a persistent resource allocation grant received from the base station, and sending subsequent power control instructions for subsequent execution by the wireless device during the duration of the persistent resource allocation grant; and

transmit according to the persistent resource allocation grant using the initial power control instruction.

23. The apparatus of claim 22, wherein the processor is further configured to cause the wireless device to:

receive a channel sounding request; and

transmit a channel sounding message in response to the channel sounding request.

24. The apparatus of claim 23, wherein the resource allocation of at least one of the dynamic resource allocation grant and the persistent resource allocation grant is based on data resulting from the channel sounding message and the resource allocation request.

25. The apparatus of claim 22, wherein the processor is further configured to reduce a transmit power for the wireless device when an allocated number of resource blocks exceeds a maximum number of resource blocks for the wireless device, wherein the maximum number of resource blocks corresponds to a maximum power of the wireless device.