POWER LIMITED CASE SIGNALLING

• US 20130201955A1
• Filed: 10/04/2011
• Published: 08/08/2013
• Est. Priority Date: 10/04/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Vujcic, Dragan
• Granted Patent: US 9,179,423 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• 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

Abstract

The disclosure relates to a method for a user equipment to report a transmission power capability to an e Node B. The user equipment operates in carrier aggregation. The method comprises determining, by the user equipment, that the transmission power capability of at least one power amplifier of the user equipment reaches at least one defined threshold, and triggering a generation of a power headroom report based on the determining step. The disclosure also relates to the corresponding user equipment and e Node B.

Claims

1. A method for a user equipment to report a transmission power capability to an e Node B, wherein the user equipment operates in carrier aggregation, the method comprising:

determining, by the user equipment, that the transmission power capability of at least one power amplifier of the user equipment reaches at least one defined threshold, and

triggering a generation of a power headroom report based on the determining step.

2. The method according to claim 1, further comprising transmitting a power headroom report for each of the component carriers that are aggregated.

3. The method according to claim 1, wherein the user equipment uses a same power amplifier for at least two component carriers.

4. The method according to claim 1, wherein the user equipment uses a different power amplifier for each component carrier.

5. The method according to claim 1, wherein the at least one defined threshold is received by the user equipment from the e Node B.

6. The method according to claim 1, wherein the power headroom report includes information about how close the user equipment is operating to its total maximum transmission power capabilities including power required for all component carriers.

7. The method according to claim 1, comprising defining several thresholds such that when the transmission power capability of the at least one power amplifier reaches any of the thresholds, the method provides information to the e Node B on how close the at least one power amplifier is operating to its maximum transmission power capabilities.

8. The method according to claim 7, wherein the power headroom report follows the LTE release 8 format modified by affecting values identifying each of the defined thresholds to some of the bits of the said format.

9. The method according to claim 2, wherein the power headroom report includes a bit to indicate whether the power headroom report is the power headroom report which is based on the determining step.

10. A user equipment configured for carrier aggregation with an e Node B, the user equipment comprising:

a processor for determining, by the user equipment, that the transmission power capability of at least one power amplifier of the user equipment reaches at least one defined threshold, and for triggering a generation of a power headroom report based on the determination, and

a transmitter for sending the power headroom report to the e Node B.

11. An e Node B arranged to carry out carrier aggregation with a user equipment, the e Node B comprising a receiver for obtaining from the user equipment:

a power headroom report for each of the component carriers that are aggregated, and

a power headroom report indicating that the transmission power capability of at least one power amplifier of the user equipment has reached at least one defined threshold.

12. The e Node B according to claim 11, arranged to set and transmit the at least one defined threshold to the user equipment.