Techniques and apparatuses for adjusting transmission power for power-limited uplink carrier aggregation scenarios

Patent metadata

Field	Value
Publication number	US-10123278-B2
Application number	US-201715788567-A
Country	US
Kind code	B2
Filing date	Oct 19, 2017
Priority date	Nov 14, 2016
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

Certain aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment may decrease a first value of a transmission power of a first component carrier relative to a second value of a transmission power of a second component carrier based at least in part on the second component carrier carrying control information for the user equipment, wherein the second value of the transmission power of the second component carrier is based at least in part on a first maximum power reduction value identified for carrier aggregation. The user equipment may increase the transmission power of the second component carrier to a third value based at least in part on a second maximum power reduction value identified for single carrier. Numerous other aspects are provided.

First claim

What is claimed is:

1. A method of wireless communication, comprising:
decreasing, by a user equipment, a first value of a transmission power of a first component carrier relative to a second value of a transmission power of a second component carrier based at least in part on the second component carrier carrying control information for the user equipment,
wherein the second value of the transmission power of the second component carrier is based at least in part on a first maximum power reduction value identified for carrier aggregation; and

increasing, by the user equipment, the transmission power of the second component carrier to a third value based at least in part on a second maximum power reduction value identified for single carrier.

2. The method of claim 1 , further comprising:
identifying the first maximum power reduction value for carrier aggregation; and
identifying the second maximum power reduction value for single carrier after decreasing the first value of the transmission power of the first component carrier, wherein decreasing the first value of the transmission power of the first component carrier includes dropping the first component carrier due to priority being given to the second component carrier.

3. The method of claim 1 , wherein decreasing the first value of the transmission power of the first component carrier relative to the second value of the transmission power of the second component carrier comprises:
decreasing the first value of the transmission power of the first component carrier relative to the second value of the transmission power of the second component carrier based at least in part on a total transmission power of the first component carrier and the second component carrier satisfying a threshold.

4. The method of claim 1 , wherein the second component carrier carries uplink control information of at least one of the first component carrier or the second component carrier.

5. The method of claim 1 , wherein decreasing the first value of the transmission power of the first component carrier relative to the second value of the transmission power of the second component carrier comprises:
decreasing the first value of the transmission power of the first component carrier to substantially zero.

6. The method of claim 1 , wherein the first component carrier is a secondary component carrier and the second component carrier is a primary component carrier.

7. The method of claim 1 , wherein at least the second value of the transmission power of the second component carrier is determined based at least in part on at least one of:
a resource block allocation of the first component carrier and the second component carrier,
an uplink bandwidth of the first component carrier and the second component carrier, or
modulation types of the first component carrier and the second component carrier.

8. The method of claim 1 , wherein at least the third value of the transmission power of the second component carrier is determined based at least in part on at least one of:
an uplink bandwidth of the second component carrier, or
a modulation type of the second component carrier.

9. The method of claim 1 , wherein:
the second value of the transmission power of the second component carrier is a first configured maximum output power for a serving cell associated with the second component carrier, the first configured maximum output power is based at least in part on the first maximum power reduction value; and
the third value of the transmission power of the second component carrier is a second configured maximum output power for a serving cell associated with the second component carrier, the second configured maximum output power is based at least in part on the second maximum power reduction value.

10. A user equipment, comprising:
a memory; and
one or more processors operatively coupled to the memory, the one or more processors configured to:
decrease a first value of a transmission power of a first component carrier relative to a second value of a transmission power of a second component carrier based at least in part on the second component carrier carrying control information for the user equipment,
wherein the second value of the transmission power of the second component carrier is based at least in part on a first maximum power reduction value identified for carrier aggregation; and

increase the transmission power of the second component carrier to a third value based at least in part on a second maximum power reduction value identified for single carrier.

11. The user equipment of claim 10 , wherein the one or more processors are further configured to:
identify the first maximum power reduction value for carrier aggregation; and
identify the second maximum power reduction value for single carrier after decreasing the first value of the transmission power of the first component carrier; and
wherein the one or more processors, when decreasing the first value of the transmission power of the first component carrier, are configured to:
drop the first component carrier due to priority being given to the second component carrier.

12. The user equipment of claim 10 , wherein the one or more processors, when decreasing the first value of the transmission power of the first component carrier relative to the second value of the transmission power of the second component carrier, are configured to:
decrease the first value of the transmission power of the first component carrier relative to the second value of the transmission power of the second component carrier based at least in part on a total transmission power of the first component carrier and the second component carrier satisfying a threshold.

13. The user equipment of claim 10 , wherein the second component carrier carries uplink control information of at least one of the first component carrier or the second component carrier.

14. The user equipment of claim 10 , wherein the one or more processors, when decreasing the first value of the transmission power of the first component carrier relative to the second value of the transmission power of the second component carrier, are configured to:
decrease the first value of the transmission power of the first component carrier to substantially zero.

15. The user equipment of claim 10 , wherein the first component carrier is a secondary component carrier and the second component carrier is a primary component carrier.

16. The user equipment of claim 10 , wherein at least the second value of the transmission power of the second component carrier is determined based at least in part on at least one of:
a resource block allocation of the first component carrier and the second component carrier,
an uplink bandwidth of the first component carrier and the second component carrier, or
modulation types of the first component carrier and the second component carrier.

17. The user equipment of claim 10 , wherein at least the third value of the transmission power of the second component carrier is determined based at least in part on at least one of:
an uplink bandwidth of the second component carrier, or
a modulation type of the second component carrier.

18. The user equipment of claim 10 , wherein:
the second value of the transmission power of the second component carrier is a first configured maximum output power for a serving cell associated with the second component carrier,
the first configured maximum output power being based at least in part on the first maximum power reduction value; and

Assignees

• Qualcomm Inc

Inventors

• Ramkumar Vasanth Kumar
• Vora Pritesh
• Yan Hongbo
• Krishnamoorthy Parthasarathy

Classifications

• H04W52/34

  TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading · CPC title

• H04W52/346

  distributing total power among users or channels · CPC title

• H04W52/343

  taking into account loading or congestion level · CPC title

• H04W52/281

  taking into account user or data type priority · CPC title

• H04W52/367

  Power values between minimum and maximum limits, e.g. dynamic range · CPC title