Power control for wireless communications
Wireless communications may be used to support transmission power control. A reference signal may be mapped to a power control parameter set. A message to schedule a transmission may be received that indicates the power control parameter set. A transmission power for the scheduled transmission may be determined based on the reference signal.
1. A method comprising:
receiving, by a wireless device, first downlink control information (DCI) for scheduling transmission of a first transport block, wherein the first DCI comprises a first sounding reference signal resource indicator (SRI) field indicating a power control parameter set;
determining, based on a first reference signal mapped to the power control parameter set, a first transmission power for a scheduled transmission of the first transport block;
transmitting the first transport block using the first transmission power;
based on receiving a medium access control (MAC) control element (CE) indicating a second reference signal, mapping the second reference signal to the power control parameter set;
receiving second DCI for scheduling transmission of a second transport block, wherein the second DCI comprises a second SRI field indicating the power control parameter set;
determining, based on the second reference signal, a second transmission power for a scheduled transmission of the second transport block; and
transmitting the second transport block using the second transmission power.
2. The method of claim 1 , further comprising:
receiving one or more messages comprising one or more configuration parameters indicating a plurality of power control parameter sets comprising the power control parameter set.
3. The method of claim 1 , wherein:
the first SRI field indicates a resource mapped to a third reference signal;
the transmitting the first transport block comprises transmitting the first transport block using a spatial domain transmission filter based on the third reference signal; and
the transmitting the second transport block comprises transmitting the second transport block using a spatial domain transmission filter based on the second reference signal.
4. The method of claim 1 , wherein:
the determining the first transmission power is further based on determining a downlink pathloss estimate of the first reference signal; and
the determining the second transmission power is further based on determining a downlink pathloss estimate of the second reference signal.
5. The method of claim 1 , wherein the mapping comprises mapping a pathloss reference reference signal (RS) index in the power control parameter set to the second reference signal.
6. The method of claim 1 , further comprising:
based on the receiving the MAC CE indicating the second reference signal, mapping the second reference signal to spatial relation information associated with a sounding reference signal (SRS) resource indicated by the second SRI field.
7. The method of claim 1 , wherein a parameter SRI-PUSCH-PowerControl indicates the power control parameter set, and wherein a parameter PUSCH-PathlossReferenceRS-Id indicates the second reference signal.
8. A method comprising:
receiving, by a wireless device, one or more configuration parameters indicating a plurality of power control parameter sets;
receiving a medium access control (MAC) control element (CE) indicating a reference signal;
mapping the reference signal to a first power control parameter set of the plurality of power control parameter sets;
receiving downlink control information (DCI) for scheduling transmission of a transport block, wherein the DCI comprises a sounding reference signal resource indicator (SRI) field indicating the first power control parameter set;
determining, based on the reference signal, a transmission power for a scheduled transmission of the transport block; and
transmitting the transport block using the transmission power.
9. The method of claim 8 , further comprising:
receiving DCI for scheduling transmission of an uplink signal, wherein the DCI for scheduling transmission of the uplink signal comprises the SRI field indicating the first power control parameter set;
determining, based on a second reference signal mapped to the first power control parameter set, a second transmission power for a scheduled transmission of the uplink signal; and
transmitting the uplink signal using the second transmission power.
10. The method of claim 8 , wherein:
the transmitting the transport block comprises transmitting the transport block using a spatial domain transmission filter based on the reference signal.
11. The method of claim 8 , wherein:
the determining the transmission power is further based on determining a downlink pathloss estimate of the reference signal.
12. The method of claim 8 , wherein the SRI field indicates a sounding reference signal (SRS) resource.
13. The method of claim 8 , further comprising:
based on the receiving the MAC CE indicating the reference signal, mapping the reference signal to spatial relation information associated with a sounding reference signal (SRS) resource indicated by the SRI field.
14. The method of claim 8 , wherein a parameter SRI-PUSCH-PowerControl indicates the first power control parameter set, and wherein a parameter PUSCH-PathlossReferenceRS-Id indicates the reference signal.
15. A method comprising:
receiving downlink control information (DCI) for scheduling transmission of a transport block, wherein the DCI comprises a sounding reference signal resource indicator (SRI) field indicating a power control parameter set;
based on receiving a medium access control (MAC) control element (CE) indicating a reference signal, mapping the reference signal to the power control parameter set;
determining a transmission power, for a scheduled transmission of the transport block, based on:
the power control parameter set; and
the reference signal; and
transmitting the transport block using the transmission power.
16. The method of claim 15 , further comprising:
receiving DCI for scheduling transmission of an uplink signal, wherein the DCI for scheduling transmission of the uplink signal comprises the SRI field indicating the power control parameter set;
determining, based on a second reference signal mapped to the power control parameter set, a second transmission power for a scheduled transmission of the uplink signal; and
transmitting the uplink signal using the second transmission power.
17. The method of claim 15 , further comprising receiving the MAC CE indicating the reference signal.
18. The method of claim 15 , wherein:
the transmitting the transport block comprises transmitting the transport block using a spatial domain transmission filter based on the reference signal; and
the determining the transmission power is further based on determining a downlink pathloss estimate of the reference signal.
19. The method of claim 15 , further comprising:
based on the receiving the MAC CE indicating the reference signal, mapping the reference signal to spatial relation information associated with a sounding reference signal (SRS) resource indicated by the SRI field.
20. The method of claim 15 , wherein a parameter SRI-PUSCH-PowerControl indicates the power control parameter set, and wherein a parameter PUSCH-PathlossReferenceRS-Id indicates the reference signal.