Apparatus and Method for Uplink Power Control For A Wireless Transmitter/Receiver Unit Utilizing Multiple Carriers

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.

1 .- 18 . (canceled) 
     
     
         19 . A method of determining a power headroom (PH) in a wireless transmit/receive unit (WTRU), the method comprising:
 transmitting, simultaneously, 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);   identifying a maximum WTRU transmit power on an uplink carrier (k);   calculating PH (i,k) as a difference between the maximum WTRU transmit power on the uplink carrier (k) and a logarithmic function; and   summing, as a part of the logarithmic function, a first expression and a second expression, the first expression including: a bandwidth factor: M PUSCH (i, k), an open-loop component: P O   _   PUSCH (j,k)+α(j, k)*PL(k), (j) being an uplink transmission parameter, and a closed loop component, the closed-loop component including a carrier specific modulation and coding scheme offset: Δ TF (i,k), the second expression including a pathloss estimate for the uplink carrier (k): PL(k), a PUCCH format dependent value, and a PUCCH power control adjustment function: g(i,k).   
     
     
         20 . The method of  claim 19 , further comprising:
 rounding the PH (i,k) to a closest value in a range in dB, in steps of 1 dB.   
     
     
         21 . The method of  claim 19 , wherein the PH (i,k) is calculated at a physical layer of the WTRU. 
     
     
         22 . The method of  claim 21 , further comprising:
 delivering the PH (i,k) to one or more layers of the WTRU higher than the physical layer.   
     
     
         23 . The method of  claim 19 , wherein the first expression further includes a closed-loop function: ƒ(i, k). 
     
     
         24 . A wireless transmit/receive unit (WTRU), comprising:
 a memory;   a transmitter, the transmitter configured at least to:
 transmit, simultaneously, 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); and 
   a processor, the processor configured at least to:
 identify a maximum WTRU transmit power on an uplink carrier (k); 
 calculate a power headroom (PH) (i,k) as a difference between the maximum WTRU transmit power on the uplink carrier (k) and a logarithmic function; and 
 sum, as a part of the logarithmic function, a first expression and a second expression, the first expression including: a bandwidth factor: M PUSCH (i, k), an open-loop component: P o   _   PUSCH (j,k)+α(j, k)*PL(k), (j) being an uplink transmission parameter, and a closed loop component, the closed-loop component including a carrier specific modulation and coding scheme offset: Δ TF (i,k), the second expression including a pathloss estimate for the uplink carrier (k): PL(k), a PUCCH format dependent value, and a PUCCH power control adjustment function: g(i,k). 
   
     
     
         25 . The WTRU of  claim 24 , wherein the processor is further configured to:
 round the PH (i,k) to a closest value in a range in dB, in steps of 1 dB.   
     
     
         26 . The WTRU of  claim 24 , wherein the processor is further configured to calculate PH (i,k) at a physical layer of the WTRU. 
     
     
         27 . The WTRU of  claim 26 , wherein the processor is further configured to:
 deliver the PH (i,k) to one or more layers of the WTRU higher than the physical layer.   
     
     
         28 . The WTRU of  claim 24 , wherein the processor is further configured such that the first expression further includes a closed-loop function: ƒ(i, k). 
     
     
         29 . A method of determining a power headroom (PH) in a wireless transmit/receive unit (WTRU), the method comprising:
 transmitting a physical uplink shared channel (PUSCH) on at least one of a plurality of carriers (k) on one or more subframes (i);   identifying a maximum WTRU transmit power on an uplink carrier (k);   calculating PH (i,k) as a difference between the maximum WTRU transmit power on the uplink carrier (k) and an expression, the expression including: a bandwidth factor: M PUSCH (i, k), an open-loop component: P o   _   PUSCH (j,k)+α(j, k)*PL(k), (j) being an uplink transmission parameter, and a closed-loop component, the closed loop component including a carrier specific modulation and coding scheme offset: Δ TF (i,k); and   summing, as part of the expression, the bandwidth factor, the open-loop component, and the closed-loop component.   
     
     
         30 . The method of  claim 29 , further comprising:
 rounding the PH (i,k) to a closest value in a range in dB, in steps of 1 dB.   
     
     
         31 . The method of  claim 29 , wherein the PH (i,k) is calculated at a physical layer of the WTRU. 
     
     
         32 . The method of  claim 31 , further comprising:
 delivering the PH (i,k) to one or more layers of the WTRU higher than the physical layer.   
     
     
         33 . The method of  claim 29 , wherein the expression further includes a closed-loop function: ƒ(i, k). 
     
     
         34 . A wireless transmit/receive unit (WTRU), comprising:
 a memory;   a transmitter, the transmitter configured at least to:
 transmit a physical uplink shared channel (PUSCH) on at least one of a plurality of carriers (k) on one or more subframes (i); and 
   a processor, the processor configured at least to:
 identify a maximum WTRU transmit power on an uplink carrier (k); 
 calculate a power headroom (PH) (i,k) as a difference between the maximum WTRU transmit power on the uplink carrier (k) and an expression, the expression including: a bandwidth factor: M PUSCH (i, k), an open-loop component: P o   _   PUSCH (j,k)+α(j, k)*PL(k), (j) being an uplink transmission parameter, and a closed-loop component, the closed loop component including a carrier specific modulation and coding scheme offset: Δ TF (i,k); and 
 sum, as part of the expression, the bandwidth factor, the open-loop component, and the closed-loop component. 
   
     
     
         35 . The WTRU of  claim 34 , wherein the processor is further configured to:
 round the PH (i,k) to a closest value in a range in dB, in steps of 1 dB.   
     
     
         36 . The WTRU of  claim 34 , wherein the processor is further configured to calculate PH (i,k) at a physical layer of the WTRU. 
     
     
         37 . The WTRU of  claim 36 , wherein the processor is further configured to:
 deliver the PH (i,k) to one or more layers of the WTRU higher than the physical layer.   
     
     
         38 . The WTRU of  claim 34 , wherein the processor is further configured such that the expression further includes a closed-loop function: ƒ(i, k).