Power control for bandwidth part switching
Systems, apparatuses, and methods are described for wireless communications. A base station may configure a power control process associated with a wireless device. Closed-loop power control (CL-CP) for the wireless device may be reset based on a change of channel conditions. The wireless device may change a transmit power and/or reset the CL-CP based on various conditions.
1. A method comprising:
switching, by a wireless device, from a first bandwidth part (BWP) to a second BWP as an active BWP of a cell;
based on a determination whether the second BWP overlaps with the first BWP in a frequency band, maintaining or resetting a closed loop power control parameter;
determining, based on the closed loop power control parameter, a first transmission power for transmitting at least one uplink transport block via the second BWP; and
transmitting, via the second BWP and based on the first transmission power, the at least one uplink transport block.
2. The method of claim 1 , wherein the determining the first transmission power is further based on applying the closed loop power control parameter from the first BWP to the second BWP.
3. The method of claim 1 , further comprising maintaining the closed loop power control parameter based on a determination that the second BWP overlaps with the first BWP.
4. The method of claim 1 , wherein the switching occurs based on a first common search space (CSS) of the first BWP being the same as a second CSS of the second BWP.
5. The method of claim 1 , further comprising resetting the closed loop power control parameter based on a determination that the second BWP does not overlap with the first BWP.
6. The method of claim 1 , wherein the switching is based on receiving downlink control information (DCI).
7. The method of claim 6 , wherein the DCI comprises at least one of:
an uplink grant for transmission of the at least one uplink transport block; or a downlink assignment.
8. The method of claim 1 , wherein the first transmission power is for at least one of: a physical uplink shared channel (PUSCH); a physical uplink control channel (PUCCH); or a sounding reference signal (SRS) transmission.
9. A method comprising:
receiving, by a wireless device, a message, for a cell, indicating a switching from a first bandwidth part (BWP) to a second BWP;
switching from the first BWP to the second BWP as an active BWP of the cell;
based on a determination whether the second BWP overlaps with the first BWP in a frequency band, maintaining or resetting a closed loop power control parameter;
determining, based on the closed loop power control parameter, a first transmission power for transmitting at least one uplink transport block via the second BWP; and
transmitting, via the second BWP and based on the first transmission power, the at least one uplink transport block.
10. The method of claim 9 , further comprising maintaining the closed loop power control parameter based on a determination that the second BWP overlaps with the first BWP.
11. The method of claim 9 , further comprising resetting the closed loop power control parameter based on a determination that the second BWP does not overlap with the first BWP.
12. The method of claim 9 , wherein the switching is based on receiving downlink control information.
13. The method of claim 9 , wherein the message comprises at least one of:
one or more radio resource control (RRC) messages;
downlink control information (DCI); or
a medium access control (MAC) control element (CE).
14. A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
switch from a first bandwidth part (BWP) to a second BWP as an active BWP of a cell;
based on a determination whether the second BWP overlaps with the first BWP in a frequency band, maintain or reset a closed loop power control parameter;
determine, based on the closed loop power control parameter, a first transmission power for transmitting at least one uplink transport block via the second BWP; and
transmit, via the second BWP and based on the first transmission power, the at least one uplink transport block.
15. The wireless device of claim 14 , wherein the instructions, when executed by the one or more processors, cause the wireless device to determine the first transmission power further based on applying the closed loop power control parameter from the first BWP to the second BWP.
16. The wireless device of claim 14 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:
maintain the closed loop power control parameter based on a determination that the second BWP overlaps with the first BWP.
17. The wireless device of claim 14 , wherein the instructions, when executed by the one or more processors, cause the wireless device to switch from the first BWP to the second BWP based on a first common search space (CSS) of the first BWP being the same as a second CSS of the second BWP.
18. The wireless device of claim 14 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:
reset the closed loop power control parameter based on a determination that the second BWP does not overlap with the first BWP.
19. The wireless device of claim 14 , wherein the instructions, when executed by the one or more processors, cause the wireless device to switch from the first BWP to the second BWP based on receiving downlink control information (DCI).
20. The wireless device of claim 19 , wherein the DCI comprises at least one of:
an uplink grant for transmission of the at least one uplink transport block; or
a downlink assignment.
21. The wireless device of claim 14 , wherein the first transmission power is for at least one of: a physical uplink shared channel (PUSCH); a physical uplink control channel (PUCCH); or a sounding reference signal (SRS) transmission.
22. A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
receive a message, for a cell, indicating, for a cell, a switching from a first bandwidth part (BWP) to a second BWP;
switch from the first BWP to the second BWP as an active BWP of the cell;
based on a determination whether the second BWP overlaps with the first BWP in a frequency band, maintain or reset a closed loop power control parameter;
determine, based on the closed loop power control parameter, a first transmission power for transmitting at least one uplink transport block via the second BWP; and
transmit, via the second BWP and based on the first transmission power, the at least one uplink transport block.
23. The wireless device of claim 22 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:
maintain the closed loop power control parameter based on a determination that the second BWP overlaps with the first BWP.
24. The wireless device of claim 22 , wherein the instructions, when executed by the one or more processors, cause the wireless device to:
reset the closed loop power control parameter based on a determination that the second BWP does not overlap with the first BWP.
25. The wireless device of claim 22 , wherein the instructions, when executed by the one or more processors, cause the wireless device to switch from the first BWP to the second BWP based on receiving downlink control information.
26. The wireless device of claim 22 , wherein the message comprises at least one of:
one or more radio resource control (RRC) messages;
downlink control information (DCI); or
a medium access control (MAC) control element (CE).