Power Control in Wireless Communications
A plurality of resource pools and/or a plurality of transmission and/or reception points may be used in wireless communications. Different pathloss references may be used for different resource pools and/or different transmission and/or reception points. A wireless device may receive one or more messages indicating a plurality of power control parameter sets each associated with a respective resource pool and/or a respective transmission and/or reception point. The wireless device may control a transmission power based on a pathloss reference associated with a resource pool and/or a transmission and/or reception point.
1 . A method comprising:
receiving, by a wireless device, one or more configuration parameters indicating:
a plurality of resource set indexes;
a first power control parameter set, wherein the first power control parameter set has a lowest power control parameter set index associated with a first resource set index of the plurality of resource set indexes; and
a second power control parameter set, wherein the second power control parameter set has a lowest power control parameter set index associated with a second resource set index of the plurality of resource set indexes;
receiving downlink control information (DCI) scheduling transmission of at least one transport block; and
based on a sounding reference signal resource indicator (SRI) field being absent in the DCI, transmitting, using a transmission power that is based on a first pathloss reference signal or a second pathloss reference signal, the at least one transport block, wherein the first pathloss reference signal is associated with the first power control parameter set, and wherein the second pathloss reference signal is associated with the second power control parameter set.
2 . The method of claim 1 , wherein the first power control parameter set is a default power control parameter set of a first plurality of power control parameter sets for the first resource set index, and
wherein the second power control parameter set is a default power control parameter set of a second plurality of power control parameter sets for the second resource set index.
3 . The method of claim 1 , wherein, for a transmission power of at least one transport block transmission, the one or more configuration parameters further indicates:
the first pathloss reference signal that is mapped to the lowest power control parameter set index of the first power control parameter set; and
the second pathloss reference signal that is mapped to the lowest power control parameter set index of the second power control parameter set.
4 . The method of claim 1 , further comprising:
determining, based on the DCI being associated with the first resource set index, the lowest power control parameter set index of the first power control parameter set; or
determining, based on the DCI being associated with the second resource set index, the lowest power control parameter set index of the second power control parameter set.
5 . The method of claim 1 , wherein:
the one or more configuration parameters further indicate a plurality of pathloss reference signals, the lowest power control parameter set index of the first power control parameter set, and the lowest power control parameter set index of the second power control parameter set,
the plurality of pathloss reference signals comprise the first pathloss reference signal and the second pathloss reference signal, and
the method further comprises receiving one or more activation commands mapping at least one pathloss reference signal, of the plurality of pathloss reference signals, to at least one of a plurality of power control parameter sets.
6 . The method of claim 1 , further comprising:
measuring at least one of the first pathloss reference signal or the second pathloss reference signal; and
determining the transmission power based on:
a first downlink pathloss estimate associated with the measuring the first pathloss reference signal, or
a second downlink pathloss estimate associated with the measuring the second pathloss reference signal.
7 . A method comprising:
transmitting, by a base station, one or more configuration parameters indicating:
a plurality of resource set indexes;
a first power control parameter set, wherein the first power control parameter set has a lowest power control parameter set index associated with a first resource set index of the plurality of resource set indexes; and
a second power control parameter set, wherein the second power control parameter set has a lowest power control parameter set index associated with a second resource set index of the plurality of resource set indexes;
transmitting downlink control information (DCI) scheduling transmission of at least one transport block; and
receiving the at least one transport block, wherein based on a sounding reference signal resource indicator (SRI) field being absent in the DCI, a transmission power for transmission of the at least one transport block is based on:
a first pathloss reference signal associated with the first power control parameter set, or
a second pathloss reference signal associated with the second power control parameter set.
8 . The method of claim 7 , wherein the first power control parameter set is a default power control parameter set of a first plurality of power control parameter sets for the first resource set index, and
wherein the second power control parameter set is a default power control parameter set of a second plurality of power control parameter sets for the second resource set index.
9 . The method of claim 7 , wherein, for a transmission power of at least one transport block transmission, the one or more configuration parameters further indicates:
the first pathloss reference signal that is mapped to the lowest power control parameter set index of the first power control parameter set; and
the second pathloss reference signal that is mapped to the lowest power control parameter set index of the second power control parameter set.
10 . The method of claim 7 , further comprising:
mapping the first pathloss reference signal to the lowest power control parameter set index of the first power control parameter set;
mapping the second pathloss reference signal to the lowest power control parameter set index of the second power control parameter set; and
generating the DCI, wherein the DCI is associated with the first resource set index or the second resource set index.
11 . The method of claim 7 , wherein:
the one or more configuration parameters further indicate a plurality of pathloss reference signals, the lowest power control parameter set index of the first power control parameter set, and the lowest power control parameter set index of the second power control parameter set,
the plurality of pathloss reference signals comprise the first pathloss reference signal and the second pathloss reference signal, and
the method further comprises transmitting one or more activation commands mapping at least one pathloss reference signal, of the plurality of pathloss reference signals, to at least one of a plurality of power control parameter sets.
12 . The method of claim 7 , further comprising:
transmitting the first pathloss reference signal and the second pathloss reference signal,
wherein the DCI scheduling transmission of the at least one transport block comprises DCI activating a configured uplink grant, and wherein the transmission of the at least one transport block is for the configured uplink grant.
13 . A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, configure the wireless device to:
receive one or more configuration parameters indicating:
a plurality of resource set indexes;
a first power control parameter set, wherein the first power control parameter set has a lowest power control parameter set index associated with a first resource set index of the plurality of resource set indexes; and
a second power control parameter set, wherein the second power control parameter set has a lowest power control parameter set index associated with a second resource set index of the plurality of resource set indexes;
receive downlink control information (DCI) scheduling transmission of at least one transport block; and
based on a sounding reference signal resource indicator (SRI) field being absent in the DCI, transmit, using a transmission power that is based on a first pathloss reference signal or a second pathloss reference signal, the at least one transport block, wherein the first pathloss reference signal is associated with the first power control parameter set, and wherein the second pathloss reference signal is associated with the second power control parameter set.
14 . The wireless device of claim 13 , wherein the first power control parameter set is a default power control parameter set of a first plurality of power control parameter sets for the first resource set index, and
wherein the second power control parameter set is a default power control parameter set of a second plurality of power control parameter sets for the second resource set index.
15 . The wireless device of claim 13 , wherein, for a transmission power of at least one transport block transmission, the one or more configuration parameters further indicates:
the first pathloss reference signal that is mapped to the lowest power control parameter set index of the first power control parameter set; and
the second pathloss reference signal that is mapped to the lowest power control parameter set index of the second power control parameter set.
16 . The wireless device of claim 13 , wherein the instructions, when executed by the one or more processors, configure the wireless device to:
determine, based on the DCI being associated with the first resource set index, the lowest power control parameter set index of the first power control parameter set; or
determine, based on the DCI being associated with the second resource set index, the lowest power control parameter set index of the second power control parameter set.
17 . The wireless device of claim 13 , wherein:
the one or more configuration parameters further indicate a plurality of pathloss reference signals, the lowest power control parameter set index of the first power control parameter set, and the lowest power control parameter set index of the second power control parameter set,
the plurality of pathloss reference signals comprise the first pathloss reference signal and the second pathloss reference signal, and
the instructions, when executed by the one or more processors, configure the wireless device to receive one or more activation commands mapping at least one pathloss reference signal, of the plurality of pathloss reference signals, to at least one of a plurality of power control parameter sets.
18 . The wireless device of claim 13 , wherein the instructions, when executed by the one or more processors, configure the wireless device to:
measure at least one of the first pathloss reference signal or the second pathloss reference signal; and
determine the transmission power based on:
a first downlink pathloss estimate associated with the measuring the first pathloss reference signal, or
a second downlink pathloss estimate associated with the measuring the second pathloss reference signal.
19 . A base station comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, configure the base station to:
transmit one or more configuration parameters indicating:
a plurality of resource set indexes;
a first power control parameter set, wherein the first power control parameter set has a lowest power control parameter set index associated with a first resource set index of the plurality of resource set indexes; and
a second power control parameter set, wherein the second power control parameter set has a lowest power control parameter set index associated with a second resource set index of the plurality of resource set indexes;
transmit downlink control information (DCI) scheduling transmission of at least one transport block; and
receive the at least one transport block, wherein based on a sounding reference signal resource indicator (SRI) field being absent in the DCI, a transmission power for transmission of the at least one transport block is based on:
a first pathloss reference signal associated with the first power control parameter set, or
a second pathloss reference signal associated with the second power control parameter set.
20 . The base station of claim 19 , wherein the first power control parameter set is a default power control parameter set of a first plurality of power control parameter sets for the first resource set index, and
wherein the second power control parameter set is a default power control parameter set of a second plurality of power control parameter sets for the second resource set index.
21 . The base station of claim 19 , wherein, for a transmission power of at least one transport block transmission, the one or more configuration parameters further indicates:
the first pathloss reference signal that is mapped to the lowest power control parameter set index of the first power control parameter set; and
the second pathloss reference signal that is mapped to the lowest power control parameter set index of the second power control parameter set.
22 . The base station of claim 19 , wherein the instructions, when executed by the one or more processors, configure the base station to:
map the first pathloss reference signal to the lowest power control parameter set index of the first power control parameter set;
map the second pathloss reference signal to the lowest power control parameter set index of the second power control parameter set; and
generate the DCI, wherein the DCI is associated with the first resource set index or the second resource set index.
23 . The base station of claim 19 , wherein:
the one or more configuration parameters further indicate a plurality of pathloss reference signals, the lowest power control parameter set index of the first power control parameter set, and the lowest power control parameter set index of the second power control parameter set,
the plurality of pathloss reference signals comprise the first pathloss reference signal and the second pathloss reference signal, and
the instructions, when executed by the one or more processors, configure the base station to transmit one or more activation commands mapping at least one pathloss reference signal, of the plurality of pathloss reference signals, to at least one of a plurality of power control parameter sets.
24 . The base station of claim 19 , wherein the instructions, when executed by the one or more processors, configure the base station to:
transmit the first pathloss reference signal and the second pathloss reference signal,
wherein the DCI scheduling transmission of the at least one transport block comprises DCI activating a configured uplink grant, and wherein the transmission of the at least one transport block is for the configured uplink grant.