Uplink Scheduling Support in Multi-Carrier Wireless Communication Systems

• US 20100273515A1
• Filed: 04/27/2009
• Published: 10/28/2010
• Est. Priority Date: 04/27/2009
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Nory, Ravikiran, Fabien, Jean-Aicard, Love, Robert T., Nangia, Vijay
• Granted Patent: US 8,437,798 B2
• Time in Patent Office: Days
• US Class Current: 455/509
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04L 2025/03802 Signalling on the reverse channel
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0091 Signaling for the administration of the divided path
• 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 52/367 Power values between minimum and maximum limits, e.g. dynamic range

Abstract

A method in a wireless communication terminal that supports aggregated carrier access including determining power headroom for a first carrier based on first carrier control information, determining power headroom for at least one additional carrier based on the first carrier control information, and transmitting a power headroom report based on the power headroom of the first carrier or the power headroom of the at least one additional carrier.

Claims

1. A method in a wireless communication terminal that supports aggregated carrier access, the method comprising:

determining power headroom for a first carrier based on first carrier control information,

determining power headroom for at least one additional carrier based on the first carrier control information,

transmitting a power headroom report based on the power headroom of the first carrier or the power headroom of the at least one additional carrier.

2. The method of claim 1, wherein the first carrier control information comprises either a resource allocation for the first carrier or power control information for the first carrier.

3. The method of claim 1, receiving the control information for the first carrier.

4. The method of claim 1, encoding the power headroom of the at least one additional carrier as a differential power headroom relative to the power headroom of the first carrier.

5. The method of claim 1,

determining when to transmit the power headroom report based on a channel metric of either the first carrier or the at least one additional carrier,

transmitting the power headroom report upon determining when to transmit the power headroom report.

6. The method of claim 1, determining when to transmit the power headroom report based on pathloss.

7. The method of claim 1, determining when to transmit the power headroom report based on either a reference signal relative power or resource allocation information.

8. The method of claim 1, transmitting the power headroom report only when a change in the channel metric of either the first carrier or the at least one additional carrier satisfies a channel metric change threshold.

9. The method in claim 1,

determining the power headroom of the first carrier based on additional maximum power reduction (A-MPR) information associated with the first carrier,

determining the power headroom of the at least one additional carrier based on A-MPR information associated with the at least one additional carrier.

10. The method in claim 1,

determining the power headroom of the first carrier based on transmission power control information of the first carrier,

determining the power headroom of the at least one additional carrier based on transmission power control information of the at least one additional carrier.

11. The method in claim 1,

determining the power headroom of the first carrier based on pathloss of the first carrier,

determining the power headroom of the at least one additional carrier based on pathloss of at least one of the first carrier and the at least one additional component carrier.

12. The method in claim 11, determining the power headroom of the at least one additional carrier based on the path loss of the first carrier comprises adjusting the path loss of the first carrier by a path loss offset based on a frequency separation between the first carrier and the at least one additional carrier.

13. A method in a wireless communication terminal that supports a plurality of transmitters, the method comprising:

determining a power headroom for a first transmitter based on a control information for the first transmitter,

determining a power headroom for at least one additional transmitter based on the first transmitter control information,

transmitting a power headroom report based on one or more of power headroom of the first transmitter and the power headroom of the at least one additional transmitter.

14. The method of claim I1, the first transmitter associated with a first carrier and the at least one additional transmitter associated with at least one additional carrier.

15. A wireless communication terminal that supports aggregated carrier access, the terminal comprising:

a transceiver;

a controller coupled to the transceiver,

the controller configured to determine a power headroom for the first carrier based on a first carrier resource allocation received at the receiver,

the controller configured to determine a power headroom for at least one additional carrier based on the first carrier resource allocation, and

the controller configure to cause the transceiver to transmit a power headroom report based on the power headroom of the first carrier and the power headroom of the at least one additional carrier.

16. The terminal of claim 15,

the controller configured to determine when to transmit the power headroom report based on path loss of either the first carrier or the at least one additional carrier,

the controller configured to cause the transceiver to transmit the power headroom report upon determining when to transmit the power headroom report.

17. The terminal of claim 15, the controller configured to cause the transceiver to transmit the power headroom report only when a change in path loss of either the first carrier or the at least one additional carrier satisfies a path loss change threshold.

18. The terminal in claim 15,

the controller configured to determine the power headroom of the first carrier based on an additional maximum power reduction (A-MPR) information associated with the first carrier,

the controller configured to determine the power headroom of the at least one additional carrier based on an A-MPR information associated with the at least one additional component carrier.

19. The terminal in claim 15,

the controller configured to determine the power headroom of the first carrier based on transmission power control information of the first carrier,

the controller configured to determine the power headroom of the at least one additional carrier based on transmission power control information of the at least one additional carrier.

20. The terminal in claim 15,

the controller configured to determine the power headroom of the first carrier based on path loss of the first carrier,

the controller configured to determine the power headroom of the at least one additional carrier based on path loss of the at least one additional component carrier.