Power control for wireless communications

1. A method comprising:

receiving, by a wireless device, one or more messages comprising one or more configuration parameters indicating a plurality of power control parameter sets for physical uplink shared channel (PUSCH) transmissions, wherein each of the plurality of power control parameter sets is indicated by a respective power control parameter set index;

receiving downlink control information (DCI) scheduling transmission of a transport block, wherein the DCI is in a format that does not comprise a sounding reference signal resource indicator (SRI) field;

based on the DCI being in a format that does not comprise an SRI field, determining a transmission power for the transport block based on a pathloss reference signal associated with a power control parameter set indicated by a lowest power control parameter set index of power control parameter set indexes of the plurality of power control parameter sets; and

transmitting the transport block using the determined transmission power.

2. The method of claim 1 , wherein each of the plurality of power control parameter sets is associated with at least one pathloss reference signal of a plurality of pathloss reference signals.

3. The method of claim 1 , further comprising:

receiving second DCI activating a configured uplink grant, wherein the second DCI is in a format that does not comprise an SRI field;

based on the second DCI being in a format that does not comprise an SRI field, determining a second transmission power of a second transport block for the configured uplink grant based on the pathloss reference signal; and

transmitting the second transport block using the second transmission power.

4. The method of claim 1 , further comprising:

receiving a message activating at least one power control parameter set of the plurality of power control parameter sets, wherein the at least one power control parameter set comprises the power control parameter set with the lowest power control parameter set index.

5. The method of claim 1 , further comprising:

receiving a message indicating at least one power control parameter set of the plurality of power control parameter sets, wherein the receiving the DCI comprises receiving the DCI after receiving the message indicating the at least one power control parameter set.

6. The method of claim 1 , further comprising:

receiving second DCI scheduling transmission of a second transport block, wherein the second DCI indicates an SRI that is mapped to a second power control parameter set of the plurality of power control parameter sets;

determining a second transmission power of the second transport block based on a second pathloss reference signal indicated by the second power control parameter set; and

transmitting the second transport block using the second transmission power.

7. The method of claim 1 , further comprising:

receiving a message indicating at least one power control parameter set of the plurality of power control parameter sets;

before the receiving the message, determining a default pathloss reference signal of a plurality of pathloss reference signals associated with the plurality of power control parameter sets; and

transmitting an uplink signal using a transmission power based on the default pathloss reference signal.

8. The method of claim 1 , wherein the lowest power control parameter set index is equal to zero.

9. A method comprising:

receiving, by a wireless device, one or more messages comprising one or more configuration parameters indicating a plurality of power control parameter sets for physical uplink shared channel (PUSCH) transmissions, wherein each of the plurality of power control parameter sets is mapped to a respective power control parameter set index;

receiving downlink control information (DCI) scheduling transmission of a transport block, wherein the DCI is in a format that does not comprise a sounding reference signal resource indicator (SRI) field;

based on the DCI being in a format that does not comprise an SRI field, determining a pathloss reference signal indicated by a power control parameter set with a lowest power control parameter set index of power control parameter set indexes of the plurality of power control parameter sets; and

transmitting the transport block using a transmission power based on the pathloss reference signal.

10. The method of claim 9 , further comprising determining the transmission power based on a downlink pathloss estimate of the pathloss reference signal.

11. The method of claim 9 , wherein each of the plurality of power control parameter sets is associated with at least one pathloss reference signal of a plurality of pathloss reference signals.

12. The method of claim 9 , further comprising:

receiving a message activating at least one power control parameter set of the plurality of power control parameter sets, wherein the at least one power control parameter set comprises the power control parameter set with the lowest power control parameter set index.

13. The method of claim 9 , further comprising:

receiving a message indicating at least one power control parameter set of the plurality of power control parameter sets, wherein the receiving the DCI comprises receiving the DCI prior to receiving the message indicating the at least one power control parameter set.

14. The method of claim 9 , further comprising:

receiving second DCI scheduling transmission of a second transport block, wherein the second DCI indicates an SRI that is mapped to a second power control parameter set of the plurality of power control parameter sets;

determining a second transmission power of the second transport block based on a second pathloss reference signal indicated by the second power control parameter set; and

transmitting the second transport block using the second transmission power.

15. The method of claim 9 , wherein the lowest power control parameter set index is equal to zero.

16. A method comprising:

receiving, by a wireless device, one or more messages comprising one or more configuration parameters indicating a plurality of power control parameter sets for physical uplink shared channel (PUSCH) transmissions, wherein each of the plurality of power control parameter sets is mapped to a respective power control parameter set index;

determining a default pathloss reference signal of a plurality of pathloss reference signals, wherein each of the plurality of pathloss reference signals is associated with a respective power control parameter set of the plurality of power control parameter sets;

transmitting a first transport block using a transmission power based on the default pathloss reference signal;

receiving a control message indicating at least one power control parameter set of the plurality of power control parameter sets; and

after the receiving the control message, transmitting a second transport block using a transmission power based on at least one pathloss reference signal associated with the at least one power control parameter set.

17. The method of claim 16 , further comprising:

after the receiving the control message and before the transmitting the second transport block, receiving downlink control information (DCI) scheduling transmission of the second transport block, wherein the DCI is in a format that does not comprise a sounding reference signal resource indicator (SRI) field; and

determining the at least one pathloss reference signal based on a lowest power control parameter set index of power control parameter set indexes of the plurality of power control parameter sets.

18. The method of claim 16 , wherein the default pathloss reference signal is indicated by a lowest power control parameter set index of power control parameter set indexes of the plurality of power control parameter sets.

19. The method of claim 18 , wherein the lowest power control parameter set index is equal to zero.

20. The method of claim 16 , wherein the default pathloss reference signal is at least one of:

a reference signal used to receive a master information block (MIB); or

a reference signal used in a latest random-access procedure.