Carrier grouping for power headroom report

Patent metadata

Field	Value
Publication number	US-9084209-B2
Application number	US-201113291756-A
Country	US
Kind code	B2
Filing date	Nov 8, 2011
Priority date	Nov 9, 2010
Publication date	Jul 14, 2015
Grant date	Jul 14, 2015

Abstract

Methods, systems, devices, and computer program products are disclosed which facilitate the transmission and reception of power headroom reports for component carriers in a multi carrier wireless communication system. A mobile device may determine available power headroom in a multicarrier configuration through a calculation of a maximum transmit power associated with a first component carrier (CC) in a subset of the CCs. The calculation can account for increases in transmit power of other component carriers in the subset by proportionally increasing transmit powers for each of the subset of CCs. A power headroom may be identified for one or more of the CCs based on a result of the calculation, and a power headroom report (PHR) may be generated that includes the power headroom available for the first CC.

First claim

What is claimed is:

1. A method of wireless communication in a multicarrier system, comprising:
determining a set of uplink component carriers to be transmitted concurrently by a mobile device;
calculating a maximum transmit power associated with a first uplink component carrier in the set, the calculation accounting for increases in transmit power of each uplink component carrier in at least a first subset of the uplink component carriers that includes the first uplink component carrier by proportionally increasing transmit powers for each of the first subset of uplink component carriers;
identifying power headroom available for the first uplink component carrier based on a result of calculating the maximum transmit power;
generating a first type of power headroom report (PHR) comprising the power headroom available for the first uplink component carrier; and
transmitting a PHR communication including the first type of PHR.

2. The method of claim 1 , wherein proportionally increasing transmit powers comprises increasing transmit powers for each of the first subset of uplink component carriers by substantially equal amounts as measured in dB.

3. The method of claim 1 , wherein each of the first subset of uplink component carriers are to be transmitted concurrently with support from a same power amplifier.

4. The method of claim 1 , further comprising:
calculating a second maximum transmit power associated with a second uplink component carrier of a second subset of the uplink component carriers, the calculation accounting for the power headroom available on the second uplink component carrier independently of other concurrently transmitted uplink component carriers;
identifying power headroom available for the second uplink component carrier based on a result of calculating the second maximum transmit power;
generating a second type of power headroom report (PHR) comprising the power headroom available for the second uplink component carrier; and
transmitting the PHR communication including the second type of PHR.

5. The method of claim 4 , further comprising:
transmitting a signal to indicate which of the first type and second type of PHR is included in the PHR communication.

6. The method of claim 4 , wherein each of the first subset of uplink component carriers are transmitted in a first frequency band, and the second uplink component carrier is transmitted in a second frequency band that is different than the first frequency band.

7. The method of claim 6 , wherein a power amplifier that supports transmission of each uplink component carrier is determined based on the frequency band of the uplink component carrier.

8. The method of claim 4 , wherein the second subset of uplink component carriers includes a single uplink component carrier, and the first subset of uplink component carriers includes two uplink component carriers.

9. The method of claim 8 , wherein first subset of uplink component carriers includes the first uplink component carrier and a third uplink component carrier, and the PHR communication includes available power headroom corresponding to the third uplink component carrier that is based on the calculated maximum transmit power for the first uplink component carrier.

10. The method of claim 1 , further comprising:
transmitting a signal to indicate the PHR communication is based on calculated maximum transmit power for only the first uplink component carrier.

11. The method of claim 1 , wherein the first type of PHR is based on the calculated maximum transmit power for each uplink component carrier.

12. The method of claim 1 , wherein each of the first subset of uplink component carriers are transmitted concurrently with support from a first power amplifier, and at least a second uplink component carrier is transmitted concurrently from the mobile device with support from a second power amplifier.

13. The method of claim 12 , further comprising:
calculating a second maximum transmit power associated with the second uplink component carrier, the calculation accounting for the power headroom available on the second uplink component carrier independently of other uplink component carriers; and
generating a second type of PHR based on the second calculated maximum transmit power, and wherein transmitting the PHR communication comprises transmitting the second type of PHR.

14. The method of claim 13 , wherein the first subset of uplink component carriers includes the first uplink component carrier and a third uplink component carrier, and the maximum transmit power for the third uplink component carrier is determined based on the calculated maximum transmit power for the first uplink component carrier.

15. The method of claim 14 , further comprising:
transmitting a signal to indicate the first type of PHR is based on the calculated maximum transmit power for only the first uplink component carrier and that the second type of PHR is based on the second calculated maximum transmit power.

16. The method of claim 13 , wherein the first type of PHR is based on the calculated maximum transmit power for each uplink component carrier of the first subset, and the second type of PHR is based on the second calculated maximum transmit power.

17. An apparatus for reporting power headroom in a multi uplink component carrier wireless communication system, comprising:
a power headroom calculation module configured to:
calculate a maximum transmit power associated with a first uplink component carrier in a set of concurrently transmitted uplink component carriers, the calculation accounting for increases in transmit power of each uplink component carrier in at least a first subset of the uplink component carriers that includes the first uplink component carrier by proportionally increasing transmit powers for each of the first subset of uplink component carriers; and
identify a power headroom available for the first uplink component carrier based on the calculated the maximum transmit power;

a power headroom reporting module configured to generate a first type of power headroom report (PHR) comprising the power headroom available for the first uplink component carrier; and
a transmitter module configured to transmit a PHR communication including the first type of PHR.

18. The apparatus of claim 17 , wherein proportionally increasing transmit powers comprises increasing transmit powers for each of the first subset of uplink component carriers by substantially equal amounts as measured in dB.

19. The apparatus of claim 17 , wherein the transmitter module comprises two or more power amplifiers, and each of the first subset of uplink component carriers are to be transmitted concurrently with support from a same power amplifier.

20. The apparatus of claim 17 , wherein:
the power headroom calculation module is further configured to:
calculate a second maximum transmit power associated with a second uplink component carrier of a second subset of the uplink component carriers, the calculation accounting for the power headroom available on the second uplink component carrier independently of other concurrently transmitted uplink component carriers; and
identify power headroom available for the second uplink component carrier based on a result of calculating the second maximum transmit power;

the power headroom reporting module is further configured to generate a second type of power headroom report (PHR) comprising the power headroom available for the second uplink component carrier; and
the transm

Assignees

• Gaal Peter
• Gheorghiu Valentin Alexandru
• Ho Sai Yiu Duncan
• Damnjanovic Jelena M
• Qualcomm Inc

Inventors

• Gaal Peter
• Gheorghiu Valentin Alexandru
• Ho Sai Yiu Duncan
• Damnjanovic Jelena M

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

• H04W52/146 Primary

  Uplink power control · CPC title

• H04W52/365 Primary

  Power headroom reporting · CPC title