Power control in schedulable wireless communication terminal

• US 8,478,328 B2
• Filed: 03/13/2012
• Issued: 07/02/2013
• Est. Priority Date: 01/23/2006
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola Mobility LLC (Lenovo Group Ltd.)
• Inventors: Love, Robert T., Classon, Brian K., Fernandes, Edgar P., Klomsdorf, Armin W., Nory, Ravikiran, Schwent, Dale G., Stewart, Kenneth A., Wilson, David R., Nangia, Vijay
• Primary Examiner(s): Cai, Wayne
• Assistant Examiner(s): HEIBER, SHANTELL LAKETA
• Application Number:
  US13/418,375
• Publication Number:
  US 20120172080A1
• Time in Patent Office: 476 Days
• Field of Search: 455/522, 455/572, 455/574, 455/127.5, 455/127.1, 455/343.1, 455/343.5
• US Class Current: 455/522
• CPC Class Codes: H04L 5/0066 Requirements on out-of-channel emissions
• CPC Class Codes: H04W 28/04 Error control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/262 taking into account adaptive modulation and coding [AMC] scheme AMC per se H04L1/0001
• CPC Class Codes: H04W 52/367 Power values between minimum and maximum limits, e.g. dynamic range
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A wireless communication entity schedulable in a wireless communication network include a radio receiver that receives radio resource assignment information including a bandwidth allocation, a controller communicably coupled to the power amplifier, wherein the controller varies an operational maximum power level of the schedulable wireless communication entity based on whether the schedulable wireless communication entity is communicating time-critical traffic or non-time-critical traffic, and wherein the operational maximum power level limits an instantaneous power at which the schedulable wireless communication entity may transmit on the radio resource assigned.

Claims

1. A method in a schedulable wireless communication entity having an operational maximum power level and that communicates in a wireless communication network, the method comprising:

receiving, at the schedulable wireless communication entity, a radio resource assignment, the radio resource assignment includes resources in a frequency band;

varying an operational maximum power level of the schedulable wireless communication entity based on whether the schedulable wireless communication entity is communicating time-critical traffic or non-time-critical traffic, the operational maximum power level limits an instantaneous power at which the schedulable wireless communication entity may transmit on the radio resource assigned;

wherein varying the operational maximum power level includes;

decreasing the operational maximum power level by a first adjustment if the schedulable wireless communication entity is communicating time-critical traffic and by a second adjustment if the schedulable wireless communication entity is communicating non-time-critical traffic as bandwidth allocated to the schedulable wireless communication entity increases, an amount of the first adjustment and the second adjustment are dependent on the increase in bandwidth; and

increasing the operational maximum power level by a third adjustment if the schedulable wireless communication entity is communicating time-critical traffic and by a fourth adjustment if the schedulable wireless communication entity is communicating non-time-critical traffic as bandwidth allocated to it decreases, an amount of the third adjustment and the fourth adjustment are dependent on the decrease in bandwidth.

2. The method of claim 1, wherein the operational maximum power level is based on a difference between a rated maximum transmit power and maximum transmit power adjustment information based on the radio resource assignment from reference information stored on the schedulable wireless communication entity.

3. The method of claim 1, wherein the operational maximum power level is based on a difference between a rated maximum transmit power and a function of a waveform power derating and an occupied bandwidth power derating.

4. The method of claim 1, varying the operational maximum power level using a first adjustment function if the schedulable wireless communication entity is communicating time-critical traffic and using a second adjustment function if the schedulable wireless communication entity is communicating non-time-critical traffic based on distance to an adjacent frequency band.

5. The method of claim 1, varying the operational maximum power level using a first adjustment function if the schedulable wireless communication entity is communicating time-critical traffic and using a second adjustment function if the schedulable wireless communication entity is communicating non-time-critical traffic based on a frequency band allocated to the schedulable wireless communication entity.

6. The method of claim 1, de-rating the operational maximum power level of the schedulable wireless communication entity by a first adjustment function if the schedulable wireless communication entity is communicating time-critical traffic and by a second adjustment function if the schedulable wireless communication entity is communicating non-time-critical traffic in accordance with frequency bands adjacent to the frequency band within which the radio resource was allocated.

7. The method of claim 1, varying the operational maximum power level by a first adjustment function if the schedulable wireless communication entity is communicating time-critical traffic and by a second adjustment function if the schedulable wireless communication entity is communicating non-time-critical traffic in accordance with a wireless communication technology deployed in a frequency band adjacent to the frequency band including the radio resource allocated to the schedulable wireless communication entity.

8. A wireless communication entity schedulable in a wireless communication network, the wireless communication entity comprising:

a radio receiver, the radio receiver receiving radio resource assignment information including a bandwidth allocation;

a power amplifier;

a controller communicably coupled to the power amplifier, the controller varying an operational maximum power level of the wireless communication entity based on whether the wireless communication entity is communicating time-critical traffic or non-time-critical traffic;

wherein the operational maximum power level limits an instantaneous power at which the wireless communication entity may transmit on the radio resource assigned;

wherein varying the operational maximum power level includes;

decreasing the operational maximum power level by a first adjustment if the wireless communication entity is communicating time-critical traffic and by a second adjustment if the wireless communication entity is communicating non-time-critical traffic as the size of the bandwidth allocation to the wireless communication entity increases, an amount of the first adjustment and the second adjustment are dependent on the increase in bandwidth; and

increasing the operational maximum power level by a third adjustment if the wireless communication entity is communicating time-critical traffic and by a fourth adjustment if the wireless communication entity is communicating non-time-critical traffic as the size of the bandwidth allocation to the wireless communication entity decreases, an amount of the third adjustment and the fourth adjustment are dependent on the decrease in bandwidth.

9. The entity of claim 8, wherein the operational maximum power level is based on a rated maximum transmit power, wherein the rated maximum transmit power level corresponds to a power class supported by the wireless communication entity.

10. The entity of claim 8, wherein the operational maximum power level is based on a difference between a rated maximum transmit power and maximum transmit power adjustment information based on the radio resource assignment from reference information stored on the wireless communication entity.

11. The entity of claim 8, wherein the operational maximum power level is based on a difference between a rated maximum transmit power and a function of a waveform power derating and an occupied bandwidth power derating.

12. The entity of claim 8, the radio resource assignment includes a time-frequency resource, the controller varying the operational maximum power level based on a waveform metric and whether the wireless communication entity is communicating time-critical traffic or non-time-critical traffic.

13. The entity of claim 8,

the radio resource assignment includes a time-frequency resource,

varying the operational maximum power level based on the allocated time-frequency resource and whether the wireless communication entity is communicating time-critical traffic or non-time-critical traffic.

14. The entity of claim 8, the controller varying the instantaneous transmit power of the wireless communication entity based on maximum power adjustment information received from the wireless communication network and whether the wireless communication entity is communicating time-critical traffic or non-time-critical traffic.

15. The entity of claim 8, the radio resource assignment information including modulation information, varying the operational maximum power level based on the modulation information by a first adjustment if the wireless communication entity is communicating time-critical traffic and by a second adjustment if the wireless communication entity is communicating non-time-critical traffic.

16. The entity of claim 8, the bandwidth allocation includes multiple subcarriers, varying the operational maximum power level based on a number of subcarriers in the bandwidth allocation and whether or not the wireless communication entity is communicating time-critical traffic.