Power headroom reporting related to power management maximum power reduction

Patent metadata

Field	Value
Publication number	US-9185666-B2
Application number	US-201213455014-A
Country	US
Kind code	B2
Filing date	Apr 24, 2012
Priority date	May 6, 2011
Publication date	Nov 10, 2015
Grant date	Nov 10, 2015

Abstract

A method, an apparatus, and a computer program product for wireless communication are provided in which a difference between a previous power management maximum power reduction (P-MPR) and a current P-MPR is determined. The previous P-MPR is the P-MPR when an indication is communicated that a power backoff is applied due to the previous P-MPR. A power headroom report (PHR) is triggered when the difference is greater than a threshold and the current P-MPR is greater than a sum of a maximum power reduction (MPR) and an additional MPR (A-MPR). Moreover, an apparatus is provided in which whether and how a P-MPR has changed is indicated in a PHR, and the PHR is transmitted. An apparatus is also provided in which a request is received from an evolved Node B (eNodeB) to report a P-MPR, and a PHR is transmitted including information related to the P-MPR.

First claim

What is claimed is:

1. A method of wireless communication, comprising:
determining, via a processor, a difference between a previous power management maximum power reduction (previous P-MPR) and a current power management maximum power reduction (current P-MPR), the previous P-MPR being a power management maximum power reduction when an indication is communicated that a power backoff is applied due to the previous P-MPR;
triggering, via the processor, a power headroom report (PHR) when the difference is greater than a threshold and the current P-MPR is greater than a sum of a maximum power reduction (MPR) and an additional MPR (A-MPR); and
indicating, via the processor:
whether the current P-MPR has changed in the PHR,
how the current P-MPR has changed in the PHR if a change was indicated, and
whether a reported current maximum output power P CMAX,c is affected by the current P-MPR in the PHR by setting an indication in the PHR when the reported P CMAX,c is unaffected by the current P-MPR, the indication indicating that the current P-MPR has not increased or decreased by more than a downlink path loss change threshold since a last report indicating the reported P CMAX,c is affected by the current P-MPR.

2. The method of claim 1 , wherein said triggering replaces a trigger of the PHR that is based on a change of the current P-MPR and the previous P-MPR being greater than a threshold, the previous P-MPR being a power management maximum power reduction when a last PHR was transmitted.

3. A method of wireless communication, comprising:
determining, via a processor, a difference between a previous power management maximum power reduction (previous P-MPR) and a current power management maximum power reduction (current P-MPR), the previous P-MPR being a power management maximum power reduction when an indication is communicated that a power backoff is applied due to the previous P-MPR;
triggering, via the processor, a power headroom report (PHR) when the difference is greater than a threshold and the current P-MPR is greater than a sum of a maximum power reduction (MPR) and an additional MPR (A-MPR); and
indicating, via the processor:
whether the current P-MPR has changed in the PHR,
how the current P-MPR has changed in the PHR if a change was indicated, and
whether a reported current maximum output power P CMAX,c is affected by the current P-MPR in the PHR, wherein whether the reported P CMAX,c is affected by the current P-MPR is indicated by setting an indication field in the PHR to a value of 01 when the reported P CMAX,c is unaffected by the current P-MPR, and the current P-MPR has increased by more than a downlink path loss change threshold since a last report indicating the reported P CMAX,c is affected by the current P-MPR.

4. A method of wireless communication, comprising:
determining, via a processor, a difference between a previous power management maximum power reduction (previous P-MPR) and a current power management maximum power reduction (current P-MPR), the previous P-MPR being a power management maximum power reduction when an indication is communicated that a power backoff is applied due to the previous P-MPR;
triggering, via the processor, a power headroom report (PHR) when the difference is greater than a threshold and the current P-MPR is greater than a sum of a maximum power reduction (MPR) and an additional MPR (A-MPR); and
indicating, via the processor:
whether the current P-MPR has changed in the PHR,
how the current P-MPR has changed in the PHR if a change was indicated, and
whether a reported current maximum output power P CMAX,c is affected by the current P-MPR in the PHR, wherein whether the reported P CMAX,c is affected by the current P-MPR is indicated by setting an indication field in the PHR to a value of 10 when the reported P CMAX,c is unaffected by the current P-MPR, and the current P-MPR has decreased by more than a downlink path loss change threshold since a last report indicating the reported P CMAX,c is affected by the current P-MPR.

5. A method of wireless communication, comprising:
determining, via a processor, a difference between a previous power management maximum power reduction (previous P-MPR) and a current power management maximum power reduction (current P-MPR), the previous P-MPR being a power management maximum power reduction when an indication is communicated that a power backoff is applied due to the previous P-MPR;
triggering, via the processor, a power headroom report (PHR) when the difference is greater than a threshold and the current P-MPR is greater than a sum of a maximum power reduction (MPR) and an additional MPR (A-MPR); and
indicating, via the processor:
whether the current P-MPR has changed in the PHR,
how the current P-MPR has changed in the PHR if a change was indicated, and
whether a reported current maximum output power P CMAX,c is affected by the current P-MPR in the PHR, wherein whether the reported P CMAX,c is affected by the current P-MPR is indicated by setting an indication field in the PHR to a value of 11 when the reported P CMAX,c is affected by the current P-MPR.

6. The method of claim 1 , wherein the PHR comprises an extended power headroom medium access control (MAC) control element and the indication is included in the extended power headroom MAC control element.

7. A method of wireless communication, comprising:
indicating to an evolved Node B (eNodeB) whether a power management maximum power reduction (P-MPR) has changed in a power headroom report (PHR);
indicating to the eNodeB how a power management maximum power reduction (P-MPR) has changed in a power headroom report (PHR) if a change was indicated;
indicating whether a reported current maximum output power P CMAX,c is affected by the P-MPR in the PHR by setting an indication in the PHR when the reported P CMAX,c is unaffected by the P-MPR, the indication indicating that the P-MPR has not increased or decreased by more than a downlink path loss change threshold since a last report indicating the reported P CMAX,c is affected by the P-MPR; and
transmitting the PHR to the eNodeB.

8. A method of wireless communication, comprising:
indicating to an evolved Node B (eNodeB) whether a power management maximum power reduction (P-MPR) has changed in a power headroom report (PHR);
indicating to the eNodeB how a power management maximum power reduction (P-MPR) has changed in a power headroom report (PHR) if a change was indicated;
indicating whether a reported current maximum output power P CMAX,c is affected by the P-MPR in the PHR, wherein whether the reported P CMAX,c is affected by the P-MPR is indicated by setting an indication field in the PHR to a value of 01 when the reported P CMAX,c is unaffected by the P-MPR, and the P-MPR has increased by more than a downlink path loss change threshold since a last report indicating the reported P CMAX,c is affected by the P-MPR; and
transmitting the PHR to the eNodeB.

9. A method of wireless communication, comprising:
indicating to an evolved Node B (eNodeB) whether a power management maximum power reduction (P-MPR) has changed in a power headroom report (PHR);
indicating to the eNodeB how a power management maximum power reduction (P-MPR) has changed in a power headroom report (PHR) if a change was indicated;
indicating whether a reported current maximum output power P CMAX,c is affected by the P-MPR in the PHR, wherein whether the reported P CMAX,c is affected by the P-MPR is indicated by setting an indication field in the PHR to a value of 10 when the reported P CMAX,c is unaffected by the P-MPR, and the P-MPR has decreased by more than a downlink path loss change threshold since a last report indicating

Assignees

• Ho Sai Yiu Duncan
• Gaal Peter
• Qualcomm Inc

Inventors

• Ho Sai Yiu Duncan
• Gaal Peter

Classifications

• Y02B60/50

  Cross-Sectional Technologies · mapped topic

• H04W52/365 Primary

  Power headroom reporting · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04W52/00 Primary

  Power management {, e.g. Transmission Power Control [TPC] or power classes} · CPC title