Controlling power in non-licensed band

• US 10,045,313 B2
• Filed: 11/10/2017
• Issued: 08/07/2018
• Est. Priority Date: 05/15/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Ahn, Joonkui, Kim, Byounghoon, Yang, Suckchel, Seo, Hanbyul, Yi, Yunjung
• Primary Examiner(s): Safaipour, Bobbak
• Application Number:
  US15/809,964
• Publication Number:
  US 20180070322A1
• Time in Patent Office: 270 Days
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 52/38 TPC being performed in particular situations
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames

Abstract

Provided are a method and an apparatus for controlling transmission power in a wireless communication system. A wireless device is connected to a first serving cell utilizing a licensed band and a second serving cell utilizing a non-licensed band. The transmission power from the second serving cell is determined by considering the clear channel assessment (CCA) coverage of the wireless device or the second serving cell.

Claims

1. A method for a wireless communication system, the method performed by a user equipment (UE) comprising:

receiving scheduling information corresponding to a physical uplink shared channel (PUSCH) transmission on a Licensed-Assisted Access (LAA) secondary cell in a scheduled subframe; and

computing a power headroom for the scheduled subframe assuming that the UE performs the PUSCH transmission on the LAA secondary cell in the scheduled subframe irrespective of whether the UE can access the LAA secondary cell for the PUSCH transmission in the scheduled subframe according to a channel access procedure.

2. The method of claim 1, further comprising:

computing a maximum uplink transmit power for the PUSCH transmission in the scheduled subframe,

wherein the maximum uplink transmit power is computed assuming that the UE performs the PUSCH transmission on the LAA secondary cell in the scheduled subframe irrespective of whether the UE can access the LAA secondary cell for the PUSCH transmission in the scheduled subframe according to the channel access procedure.

3. The method of claim 1, further comprising:

reporting the computed power headroom for the scheduled subframe.

4. The method of claim 3, wherein the power headroom is reported as a medium access control (MAC) control element (CE).

5. The method of claim 1, wherein the power headroom for the scheduled subframe is computed based on a bandwidth used for the PUSCH transmission on the LAA secondary cell.

6. A device for a wireless communication system, the device comprising:

a radio frequency (RF) unit configured to receive and transmit radio signals; and

a processor operatively coupled with the RF unit and configured to;

control the RF unit to receive scheduling information corresponding to a physical uplink shared channel (PUSCH) transmission on a Licensed-Assisted Access (LAA) secondary cell in a scheduled subframe; and

compute a power headroom for the scheduled subframe assuming that the device performs the PUSCH transmission on the LAA secondary cell in the scheduled subframe irrespective of whether the device can access the LAA secondary cell for the PUSCH transmission in the scheduled subframe according to a channel access procedure.

7. The device of claim 6, wherein the processor is further configured to compute a maximum uplink transmit power for the PUSCH transmission in the scheduled subframe,

wherein the maximum uplink transmit power is computed assuming that the device performs the PUSCH transmission on the LAA secondary cell in the scheduled subframe irrespective of whether the device can access the LAA secondary cell for the PUSCH transmission in the scheduled subframe according to the channel access procedure.

8. The device of claim 6, wherein the processor is further configured to report the computed power headroom for the scheduled subframe.

9. The device of claim 8, wherein the power headroom is reported as a medium access control (MAC) control element (CE).

10. The device of claim 6, wherein the power headroom for the scheduled subframe is computed based on a bandwidth used for the PUSCH transmission on the LAA secondary cell.