Apparatus and method for uplink power control for a wireless transmitter/receiver unit utilizing multiple carriers
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. 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:
PH
(
i
,
k
)
=
P
CMAX
(
k
)
-
10
log
10
(
10
{
10
log
10
(
M
PUSCH
(
i
,
k
)
)
+
P
O_PUSCH
(
j
,
k
)
+
α
(
j
,
k
)
·
PL
(
k
)
+
Δ
TF
(
i
,
k
)
+
f
(
i
,
k
)
}
10
+
10
{
P
O_PUCCH
(
k
)
+
PL
(
k
)
+
h
(
n
CQI
,
n
HARQ
,
k
)
+
Δ
F_PUCCH
(
F
)
+
g
(
i
,
k
)
}
10
)
,
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.
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 log 10 ( M PUSCH ( i,k ))+ P O — PUSCH ( 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.