Power control framework for multi-beam configuration
View Patent ↗A method for determining a Physical Uplink Share Channel (PUSCH) transmission power may comprise measuring reference signal received power, calculating downlink path loss by comparing the reference signal received power to a downlink transmit power from a next generation node B (gNB), obtaining parameters from the gNB, and determining the PUSCH transmission power based on a configured user equipment (UE) transmission power, bandwidth of PUSCH resource assignment, a target power including the sum of a cell specific nominal component and a UE specific component, a scaling factor, a downlink (DL) path loss, a UE specific parameter for different types of traffic, and a PUSCH power control adjustment state. The method may further comprise calculating a numerology adjustment factor based on a configured subcarrier spacing and a default subcarrier spacing, and utilizing the numerology adjustment factor to determine the PUSCH transmission power.
1. A method for determining a Physical Uplink Share Channel (PUSCH) transmission power, the method implementable by a user equipment (UE), the method comprising:
measuring reference signal received power;
calculating downlink path loss by comparing the reference signal received power to a downlink transmit power from a next generation node B (gNB);
obtaining parameters from the gNB; and
determining the PUSCH transmission power P PUSCH,c (i,j) for a PUSCH transmission of a serving cell c using parameter set configuration with index j in PUSCH transmission period i, based on a formula as follows:
P
PUSCH
,
c
(
i
,
j
)
=
min
{
P
CMAX
,
c
(
i
)
,
10
log
10
(
M
PUSCH
,
c
(
i
)
)
+
P
O_PUSCH
,
c
(
j
)
+
α
c
(
j
)
·
PL
c
+
Δ
TF
,
c
(
i
)
+
f
c
(
i
)
}
,
wherein P CMAX,c (i) is a configured UE transmission power for the serving cell c in the PUSCH transmission period i, M PUSCH,c (i) is bandwidth of PUSCH resource assignment expressed in number of resource blocks for PUSCH transmission period i, P O _ PUSCH,c (j) is a target power including the sum of a cell specific nominal component P O _ NOMINAL _ PUSCH,c (j) and a UE specific component P O _ UE _ PUSCH,c (j), α c (j) is a scaling factor, PL c is a downlink (DL) path loss, Δ TF,c (i) is a UE specific parameter for different types of traffic, and f c (i) is PUSCH power control adjustment state for the PUSCH transmission period i;
wherein the method further comprising:
calculating a numerology adjustment factor δ scs as follows:
δ
SCS
=
10
log
(
SCS
conf
SCS
default
)
[
dB
]
,
wherein SCS conf is a configured subcarrier spacing for the PUSCH transmission and SCS default is default subcarrier spacing; and
utilizing the numerology adjustment factor δ SCS as an additional parameter to determine the PUSCH transmission power as follows:
P
PUSCH
,
c
(
i
,
j
)
=
min
{
P
CMAX
,
c
(
i
)
,
10
log
10
(
M
PUSCH
,
c
(
i
)
)
+
δ
SCS
+
P
O_PUSCH
,
c
(
j
)
+
α
c
(
j
)
·
PL
c
+
Δ
TF
,
c
(
i
)
+
f
c
(
i
)
}
.
2. The method of claim 1 , further comprising:
determining a reliability requirement of the PUSCH transmission; and
setting a value of a UE specific component P O _ UE _ PUSCH,c (i) in the target power P O _ PUSCH,c (j) based on the reliability requirement.
3. The method of claim 2 , wherein the reliability requirement includes one or more of Ultra Reliable Low Latency Communication (URLLC) and enhanced Mobile Broadband (eMBB).
4. The method of claim 1 , further comprising:
determining a UL multiple access scheme of the PUSCH transmission; and
setting a value of the nominal component P O _ NOMINAL PUSCH,c (j) of the target power P O _ PUSCH,c (j) based on the UL multiple access scheme.
5. The method of claim 4 , wherein the multiple access scheme includes one or more of scheduled based orthogonal multiple access (SB-OMA), non-orthogonal multiple access (NOMA) and grant free multiple access (GRMA).
6. The method of claim 1 , further comprising:
measuring peak-to-average power ratio (PAPR);
calculating a back-off factor Δ B,c (j) based on the measured PAPR, PAPR measured , and the average PAPR of Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM), Avg.PAPR DFT-S-OFDM , as follows:
Δ
B
,
c
(
j
)
=
10
log
(
PAPR
measured
Avg
.
PAPR
DFT
-
S
-
OFDM
)
[
dB
]
;
and
utilizing the back-off factor Δ B (j) as an additional parameter to determine the transmission power as follows:
P
PUSCH
,
c
(
i
,
j
)
=
min
{
P
CMAX
,
c
(
i
)
-
Δ
B
,
c
(
j
)
,
10
log
10
(
M
PUSCH
,
c
(
i
)
)
+
P
O_PUSCH
,
c
(
j
)
+
α
c
(
j
)
·
PL
c
+
Δ
TF
,
c
(
i
)
+
f
c
(
i
)
}
.
7. The method of claim 1 , further comprising:
obtaining individual downlink (DL) path loss PL c,m of one beam m among multiple detected beams in multi-beam configuration, wherein m∈{1, 2 . . . , M} and M is the number of the multiple detected beams; and
calculating the DL path loss PL c as follows: PL c =PL c,R +δ c,R,m , wherein PL c,R is a reference path loss, δ c,R,m =β*(PL c,m −PL c,R ), wherein β is a correlation factor between beams configured by higher layer and 0<β≤1.
8. The method of claim 1 , further comprising:
obtaining individual downlink (DL) path loss PL c,m of one beam m among multiple detected beams in multi-beam configuration, wherein m∈{1, 2, . . . , M} and M is the number of the multiple detected beams; and
calculating the DL path loss PL c based on an optimization of joint reception of multiple path losses.
9. The method of claim 8 , wherein the DL path loss PL c is calculated as the minimum of all individual DL path loss min{PL c,1 , PL c,2 , . . . , PL c,M }.
10. The method of claim 8 , wherein the DL path loss PL c is calculated as the maximum of all individual DL path loss max{PL c,1 , PL c,2 , . . . , PL c,M }.
11. The method of claim 8 , wherein the DL path loss PL c is calculated as a weighted combination of all individual DL path loss
1
M
(
w
1
PL
c
,
1
+
w
2
PL
c
,
2
+
…
+
w
M
PL
c
,
M
}
.
12. A user equipment (UE) for determining a Physical Uplink Share Channel (PUSCH) transmission power, the user equipment comprising:
one or more processors; and
a memory storing instructions that, when executed by the one or more processors, cause the user equipment to perform:
measuring reference signal received power;
calculating downlink path loss by comparing the reference signal received power to a downlink transmit power from a next generation node B (gNB);
obtaining parameters from the gNB; and
determining the PUSCH transmission power P PUSCH,c (i,j) for a PUSCH transmission of a serving cell c using parameter set configuration with index j in PUSCH transmission period i, based on a formula as follows:
P
PUSCH
,
c
(
i
,
j
)
=
min
{
P
CMAX
,
c
(
i
)
,
10
log
10
(
M
PUSCH
,
c
(
i
)
)
+
P
O_PUSCH
,
c
(
j
)
+
α
c
(
j
)
·
PL
c
+
Δ
TF
,
c
(
i
)
+
f
c
(
i
)
}
,
wherein P CMAX,c (i) is a configured UE transmission power for the serving cell c in the PUSCH transmission period i, M PUSCH,c (i) is bandwidth of PUSCH resource assignment expressed in number of resource blocks for PUSCH transmission period i, P O _ PUSCH,c (j) is a target power including the sum of a cell specific nominal component P O _ NOMINAL _ PUSCH,c (i) and a UE specific component P O _ UE _ PUSCH,c (i), α c (j) is a scaling factor, PL c is a downlink (DL) path loss, Δ TF,c (i) is a UE specific parameter for different types of traffic, and f(i) is PUSCH power control adjustment state for the PUSCH transmission period i;
wherein the instructions, when executed by the one or more processors, further cause the user equipment to perform:
calculating a numerology adjustment factor δ scs as follows:
δ
SCS
=
10
log
(
SCS
conf
SCS
default
)
[
dB
]
,
wherein SCS conf is a configured subcarrier spacing for the PUSCH transmission and SCS default is default subcarrier spacing; and
utilizing the numerology adjustment factor δ SCS as an additional parameter to determine the PUSCH transmission power as follows:
P
PUSCH
,
c
(
i
,
j
)
=
min
{
P
CMAX
,
c
(
i
)
,
10
log
10
(
M
PUSCH
,
c
(
i
)
)
+
δ
SCS
+
P
O_PUSCH
,
c
(
j
)
+
α
c
(
j
)
·
PL
c
+
Δ
TF
,
c
(
i
)
+
f
c
(
i
)
}
.
13. The user equipment of claim 12 , wherein the instructions, when executed by the one or more processors, further cause the user equipment to perform:
determining a reliability requirement of the PUSCH transmission; and
setting a value of a UE specific component P O _ UE _ PUSCH,c (i) in the target power P O _ PUSCH,c (j) based on the reliability requirement.
14. The user equipment of claim 12 , wherein the instructions, when executed by the one or more processors, further cause the user equipment to perform:
determining a UL multiple access scheme of the PUSCH transmission; and
setting a value of the nominal component P O _ NOMINAL PUSCH,c (j) of the target power P O _ PUSCH,c (j) based on the UL multiple access scheme.
15. The user equipment of claim 12 , wherein the instructions, when executed by the one or more processors, further cause the user equipment to perform:
measuring peak-to-average power ratio (PAPR);
calculating a back-off factor Δ B,c (j) based on the measured PAPR, PAPR measured , and the average PAPR of Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing (DFT-S-OFDM), Avg.PAPR DFT-S-OFDM, as follows:
Δ
B
,
c
(
j
)
=
10
log
(
PAPR
measured
Avg
.
PAPR
DFT
-
S
-
OFDM
)
[
dB
]
;
and
utilizing the back-off factor Δ B (j) as an additional parameter to determine the transmission power as follows:
P
PUSCH
,
c
(
i
,
j
)
=
min
{
P
CMAX
,
c
(
i
)
-
Δ
B
,
c
(
j
)
,
10
log
10
(
M
PUSCH
,
c
(
i
)
)
+
P
O_PUSCH
,
c
(
j
)
+
α
c
(
j
)
·
PL
c
+
Δ
TF
,
c
(
i
)
+
f
c
(
i
)
}
.
16. The user equipment of claim 12 , wherein the instructions, when executed by the one or more processors, further cause the user equipment to perform:
obtaining individual downlink (DL) path loss PL c,m of one beam m among multiple detected beams in multi-beam configuration, wherein m∈{1,2, . . . , M} and M is the number of the multiple detected beams; and
calculating the DL path loss PL c as follows: PL c =P c,R +δ c,R,m , wherein PL c,R is a reference path loss, δ c,R,m =β*(PL c,m −PL c,R ), wherein β is a correlation factor between beams configured by higher layer and 0<β≤1.
17. The user equipment of claim 12 , wherein the instructions, when executed by the one or more processors, further cause the user equipment to perform:
obtaining individual DL path loss PL c,m of one beam m among multiple detected beams in multi-beam configuration, wherein m∈{1, 2, . . . , M} and M is the number of the multiple detected beams; and
calculating the DL path loss PL c based on an optimization of joint reception of multiple path losses.
18. A base station of a communication system for facilitating the determination of a Physical Uplink Share Channel (PUSCH) transmission power, the base station comprising:
a transceiver and a controller controlling the transceiver, the controller comprising one or more processors and a memory storing instructions that, when executed by the one or more processors, cause the controller to perform:
transmitting a signal including a reference signal to a user equipment (UE); and
signaling the parameters to the user equipment for determining a PUSCH transmission power P PUSCH,c (i,j) for a PUSCH transmission of a serving cell c using parameter set configuration with index j in PUSCH transmission period i, based on a formula as follows:
P
PUSCH
,
c
(
i
,
j
)
=
min
{
P
CMAX
,
c
(
i
)
,
10
log
10
(
M
PUSCH
,
c
(
i
)
)
+
P
O_PUSCH
,
c
(
j
)
+
α
c
(
j
)
·
PL
c
+
Δ
TF
,
c
(
i
)
+
f
c
(
i
)
}
,
wherein P CMAX,c (i) is a configured UE transmission power for the serving cell c in the PUSCH transmission period i, M PUSCH,c (i) is bandwidth of PUSCH resource assignment expressed in number of resource blocks for PUSCH transmission period i, P O _ PUSCH,c (j) is a target power including the sum of a cell specific nominal component P O _ NOMINAL _ PUSCH,c (j) and a UE specific component P O _ UE _ PUSCH,c (j), α c (j) is a scaling factor, PL c is a downlink path loss, Δ TF,c (i) is a UE specific parameter for different types of traffic, and f(i) is PUSCH power control adjustment state for the PUSCH transmission period i;
signaling the parameters to the user equipment for calculating a numerology adjustment factor δ scs as follows:
δ
SCS
=
10
log
(
SCS
conf
SCS
default
)
[
dB
]
,
wherein SCS conf is a configured subcarrier spacing for the PUSCH transmission and SCS default is default subcarrier spacing; and
utilizing the numerology adjustment factor δ SCS as an additional parameter to determine the PUSCH transmission power as follows:
P
PUSCH
,
c
(
i
,
j
)
=
min
{
P
CMAX
,
c
(
i
)
,
10
log
10
(
M
PUSCH
,
c
(
i
)
)
+
δ
SCS
+
P
O
PUSCH
,
c
(
j
)
+
α
c
(
j
)
·
PL
c
+
Δ
TF
,
c
(
i
)
+
f
c
(
i
)
}
.