APPARATUS AND METHOD FOR REPORTING POWER HEADROOM IN WIRELESS COMMUNICATION SYSTEM

• US 20150215877A1
• Filed: 07/18/2013
• Published: 07/30/2015
• Est. Priority Date: 07/19/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ahn, Joonkui, Yang, Suckchel
• Granted Patent: US 9,392,556 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 52/0206 in access points, e.g. base stations access point devices per se H04W88/08
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Provided are an apparatus and a method for reporting a power headroom in a wireless communication system. A terminal may check the configuration of a plurality of subframes for multiple serving cells, determine at least one power headroom (PH) in correspondence to at least one subframe corresponding to the subframe for which an uplink configuration is established, from among the plurality of subframes, and perform a power headroom report (PHR) including said at least one PH.

Claims

1. A method for reporting a power headroom by a user equipment (UE) in a wireless communication system, the method comprising:

determining configurations of a plurality of sub-frames for a plurality of serving cells;

determining at least one power headroom (PH) corresponding to at least one sub-frame for which an uplink configuration is established among the plurality of sub-frames; and

generating and transmitting a power headroom report (PHR) including the at least one PH.

2. The method of claim 1, wherein the plurality of serving cells have different uplink and downlink configurations per cell depending on time division duplex schemes.

3. The method of claim 1, wherein generating and transmitting the PHR includes excluding at least one PH corresponding to at least one sub-frame for which a downlink configuration is established among the plurality of sub-frames.

4. The method of claim 3, wherein the at least one sub-frame for which the downlink configuration is established is for a primary serving cell (PCell) or a secondary serving cell (SCell).

5. The method of claim 3, wherein generating and transmitting the PHR includes, without considering an uplink configuration or a downlink configuration of a sub-frame for a primary serving cell (PCell), including and transmitting a PH in a corresponding sub-frame for the PCell and at least one PH corresponding to the at least one sub-frame for which the uplink configuration is established for a secondary serving cell (SCell).

6. The method of claim 5, wherein generating and transmitting the PHR includes including and transmitting a PH considering simultaneous transmission on a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH) and a PH considering transmission on the PUSCH, for the PCell and at least one PH corresponding to the at least one sub-frame for which the uplink configuration is established for the secondary serving cell and at least one maximum transmit power (Pcmax,c) of the UE for the secondary serving cell.

7. An apparatus for reporting a power headroom in a wireless communication system, comprising:

an RF (Radio Frequency) unit transmitting and receiving a radio signal; and

a processor connected with the RF unit, the processor determining configurations of a plurality of sub-frames for a plurality of serving cells, determining at least one power headroom (PH) corresponding to at least one sub-frame for which an uplink configuration is established among the plurality of sub-frames, and generating and transmitting a power headroom report (PHR) including the at least one PH.

8. The apparatus of claim 7, wherein the processor identifies that the plurality of serving cells have different uplink and downlink configurations per cell depending on time division duplex schemes.

9. The apparatus of claim 7, wherein the processor generates the PHR by excluding at least one PH corresponding to at least one sub-frame for which a downlink configuration is established among the plurality of sub-frames.

10. The apparatus of claim 9, wherein the processor identifies that the at least one sub-frame for which the downlink configuration is established is for a primary serving cell (PCell) or a secondary serving cell (SCell).

11. The apparatus of claim 9, wherein the processor, without considering an uplink configuration or a downlink configuration of a sub-frame for a primary serving cell (PCell), generates a PH in a corresponding sub-frame for the PCell and generates the PHR to include at least one PH corresponding to the at least one sub-frame for which the uplink configuration is established for a secondary serving cell (SCell).

12. The apparatus of claim 11, wherein the processor generates a PH considering simultaneous transmission on a physical uplink shared channel (PUSCH) and a physical uplink control channel (PUCCH) and a PH considering transmission on the PUSCH, for the PCell and generates the PHR to include at least one PH corresponding to the at least one sub-frame for which the uplink configuration is established for the secondary serving cell and at least one maximum transmit power (Pcmax,c) of the UE for the secondary serving cell.