Apparatus and method for uplink power control for a wireless transmitter/receiver unit utilizing multiple carriers

• US 8,982,801 B2
• Filed: 02/09/2010
• Issued: 03/17/2015
• Est. Priority Date: 02/09/2009
• Status: Active Grant

• Current Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Original Assignee: InterDigital Patent Holdings, Inc. (InterDigital, Inc.)
• Inventors: Shin, Sung-Hyuk, Zhang, Guodong, Stern-Berkowitz, Janet A., Pietraski, Philip J., Dick, Stephen G., Levy, Joseph S., Pan, Kyle Jung-Lin, Bala, Erdem, Rudolf, Marian, Terry, Stephen E., Koo, Chang-Soo, Dennean, Charles A., Zeira, Eldad M.
• Primary Examiner(s): Chery, Dady
• Application Number:
  US12/703,092
• Publication Number:
  US 20110038271A1
• Time in Patent Office: 1,862 Days
• Field of Search: 370/252, 370/241, 370/311, 455/522, 455/69
• US Class Current: 370/329
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/10 Open loop power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/281 taking into account user or data type priority
• CPC Class Codes: H04W 52/365 Power headroom reporting
• CPC Class Codes: H04W 72/0473 the resource being transmission power
• CPC Class Codes: H04W 72/21 in the uplink direction of a wireless link, i.e. towards the network

Abstract

A method and apparatus for determining uplink power in a wireless transmit receive unit (WTRU). The WTRU operates in a carrier aggregated system. The WTRU is configured to receive a plurality of uplink power parameters indexed to one of a plurality of uplink carriers and receive a transmit power control command indexed to the one of the plurality of uplink carriers. The WTRU is configured to determine a pathloss of the one of the plurality of uplink carriers and determine a transmit power for the one of the plurality of uplink carriers based on the plurality of power parameters, the transmit power control command, and the pathloss.

Claims

1. A method of determining a power headroom (PH) in a wireless transmit/receive unit (WTRU), the WTRU configured to simultaneously transmit a physical uplink shared channel (PUSCH) with a physical uplink control channel (PUCCH) on at least one of carrier (k) on one or more subframes (i), the method comprising calculating PH (i, k) as:

2. A method of determining a power headroom (PH) in a wireless transmit/receive unit (WTRU), the WTRU configured to transmit a physical uplink shared channel (PUSCH) on at least one of a plurality of carriers (k) on one or more subframes (i), the method comprising calculating PH (i, k) as:

PH(i,k)=P_CMAX(k)−

{10 log₁₀(M_PUSCH(i,k))+P<sub>O—

PUSCH</sub>(j,k)+α

(j,k)·

PL(k)+Δ

_TF(i,k)+ƒ

(i,k)},

wherein PH (i,k) is rounded to the closest value in a range in dB, in steps of 1 dB, and delivered by a physical layer to one or more higher layers.

3. A method of determining a power headroom (PH) in a wireless transmit/receive unit (WTRU), the WTRU configured to simultaneously transmit a physical uplink shared channel (PUSCH) with a physical uplink control channel (PUCCH) on at least one of carrier (k) on one or more subframes (i), the method comprising calculating PH (i, k) as a difference between a maximum WTRU transmit power on an uplink carrier (k) and a logarithmic function, the logarithmic function including a sum of a first expression and a second expression, the first expression including:

a bandwidth factor, an open-loop component, the open-loop component including a pathloss estimate for the uplink carrier (k), and a closed loop component, the closed loop component including a carrier specific modulation and coding scheme offset, and the second expression including;

the pathloss estimate for the uplink carrier (k), a PUCCH format dependent value, and a PUCCH power control adjustment function.

4. The method of claim 3, wherein the first expression further includes a closed-loop function.

5. A method of determining a power headroom (PH) in a wireless transmit/receive unit (WTRU), the WTRU configured to transmit a physical uplink shared channel (PUSCH) on at least one of a plurality of carriers (k) on one or more subframes (i), the method comprising calculating PH (i, k) as a difference between a maximum WTRU transmit power on an uplink carrier (k) and an expression, the expression including:

a bandwidth factor, an open-loop component, the open-loop component including a pathloss estimate for the uplink carrier (k), and a closed loop component, the closed loop component including a carrier specific modulation and coding scheme offset.

6. The method of claim 5, wherein the expression further includes a closed-loop function.