Power control for multi-channels and power prioritization
A method, network node and wireless device (WD) and apparatus for power control for multiple channels and power prioritization are disclosed. According to one aspect, a method in a network node includes determining a first WD-specific power limit for each cell c of a cell group that includes at least one primary cell, PCell, and up to N secondary cells, SCells, N being a non-negative integer. The method also includes transmitting an indication of the first WD-specific power limit.
1 . A network node configured to communicate with a wireless device, WD, the network node comprising:
processing circuitry configured to determine a first WD-specific power limit for each cell c of a cell group that includes at least one primary cell, PCell, and up to N secondary cells, SCells, N being a non-negative integer;
a radio interface in communication with the processing circuitry, the radio interface configured to transmit an indication of the first WD-specific power limit; and
the processing circuitry being further configured to:
determine a first cell-specific power limit, P Max , that applies to all WDs within a cell, each WD configured to use the PCell and the up to N SCells; and
configure an uplink duty cycle of at least one serving cell to achieve an average power during a time duration that is not greater than a default power class limit.
2 . The network node of claim 1 ,
wherein the processing circuitry is further configured to determine WD-specific power limits,
X
max
,
f
,
c
(
k
)
,
for each cell c in the cell group relative to a reference level, where k denotes a particular one of at least one set, each of the at least one set corresponding to a transmission type.
3 . The network node of claim 1 ,
wherein the first WD-specific power limit is indicated by at least one of downlink control information, DCI, and a medium access control, MAC CE.
4 . The network node of claim 1 , wherein the first WD-specific power limit for each cell c in the cell group is configured for each of a plurality of carrier frequencies.
5 . A method in a network node configured to communicate with a wireless device, WD, the method comprising:
determining a first WD-specific power limit for each cell c of a cell group that includes at least one primary cell, PCell, and up to N secondary cells, SCells, N being a non-negative integer; and
transmitting an indication of the first WD-specific power limit;
determining a first cell-specific power limit, P Max , that applies to all WDs within a cell, each WD configured to use the PCell and the up to N SCells; and
configuring an uplink duty cycle of at least one serving cell to achieve an average power during a time duration that is not greater than a default power class limit.
6 . The method of claim 5 , further comprising determining WD-specific power limits,
X
max
,
f
,
c
(
k
)
,
for each cell c in the cell group relative to a reference level, where k denotes a particular one of at least one set, each of the at least one set corresponding to a transmission type.
7 . The method of claim 5 , wherein the first WD-specific power limit is indicated by at least one of downlink control information, DCI, and a medium access control, MAC CE.
8 . The method of claim 5 , wherein the first WD-specific power limit for each cell c in the cell group is configured for each of a plurality of carrier frequencies.
9 . A wireless device, WD, configured to communicate with a network node, the WD comprising:
a radio interface configured to receive a first WD-specific power limit for each cell c of a cell group that includes at least one primary cell, PCell, and up to N secondary cells, SCells, N being a non-negative integer;
processing circuitry in communication with the radio interface, the processing circuitry configured to:
determine a first maximum power for a cell c, P CMAX,f,c (i) in the cell group, based at least in part on the first WD-specific power limit;
limit a transmit power of the WD based at least in part on the first maximum power for a cell, P CMAX,f,c (i);
cause transmission of one or more uplink channels in one or more of the cells in the cell groups using the determined limited transmit power;
determine a total power, P CMAX , that includes a sum of a power of the PCell plus a power of the up to N SCells, and to apply P CMAX ; and
determine an amount of power available for the up to N SCells based at least in part on a difference given by
P
CMAX
-
P
max
,
f
,
Pcell
(
k
)
where
P
max
,
f
,
Pcell
(
k
)
is power allocated to the PCell; and
the radio interface being further configured to receive a first cell-specific power limit, P Max , that applies to all WDs within a cell, each WD configured to use the PCell and the up to N SCells and P CMAX,f,c (i), being further based at least in part on the first cell-specific power limit, P Max .
10 . The WD of claim 9 , wherein the radio interface is further configured to receive at least one relative power limit,
X
max
,
f
,
c
(
k
)
,
for a cell c in the cell group relative to a reference level and the processing circuitry is further configured to determine P CMAX,f,c (i) based at least in part on the difference, P CMAX,f,c −X (k) max,f,c .
11 . The WD of claim 9 , wherein the processing circuitry is further configured to limit the transmit power based at least in part on the first maximum power, P CMAX,f,c (i), for a cell c in the cell group for a first duration of time configured by the network node.
12 . The WD of claim 11 , wherein the processing circuitry is further configured to:
count a number of times during a time interval that the first maximum power for the PCell, P CMAX,f,c (i), is reached by the transmit power during the first duration of time;
compare the number of times to a threshold; and
when the number of times exceeds the threshold, continuing to limit the transmit power based at least in part on
P
max
,
f
,
Pcell
(
k
)
,
for a current set, k, where
P
max
,
f
,
Pcell
(
k
)
is a power allocated to the PCell.
13 . A method in a wireless device, WD, configured to communicate with a network node, the method comprising:
receiving a first WD-specific power limit, P max,f,c , for each of at least one
primary cell, PCell, and up to N secondary cells, SCells, N being a non-negative integer; determining a first maximum power for a cell, P CMAX,f,c (i), based at least in part on the first WD-specific power limit;
limiting a transmit power of the WD based at least in part on the first maximum power for a cell, P CMAX,f,c (i);
transmitting one or more uplink channels in one or more of the cells in the cell groups using the determined limited transmit power;
receiving the first cell-specific power limit, P Max , that applies to all WDs within a cell, each WD configured to use the PCell and the up to N SCells, and P CMAX,f,c (i), being further based at least in part on a first cell-specific power limit, P Max ;
determining a total power, P CMAX , that includes a sum of a power of the PCell plus a power of the up to N SCells, and to apply P CMAX ; and
determining an amount of power available for the up to N SCells based at least in part on a difference given by
P
CMAX
-
P
max
,
f
,
Pcell
(
k
)
,
where
P
max
,
f
,
Pcell
(
k
)
is power allocated to the PCell.
14 . The method of claim 13 , further comprising receiving at least one relative power limit,
X
max
,
f
,
c
(
k
)
,
for a cell c in the cell group relative to a reference power and determining P CMAX,f,c (i) based at least in part on the difference, P CMAX,f,c −X (k) max,f,c .
15 . The method of claim 13 , further comprising limiting the transmit power based at least in part on the first maximum power, P CMAX,f,c (i), for a cell c in the cell group for a first duration of time configured by the network node.
16 . The method of claim 15 , further comprising: counting a number of times during a time interval that the first maximum power for the PCell, P CMAX,c,f (i), is reached by the transmit power during the first duration of time; comparing the number of times to a threshold; and when the number of times exceeds the threshold, continuing to limit the transmit power based at least in part on
P
max
,
f
,
Pcell
(
k
)
,
for a current set, k, where
P
max
,
f
,
Pcell
(
k
)
is a power allocated to the PCell.