Bandwidth part operation for combination DCI for scheduling multiple cells
Certain aspects of the present disclosure provide techniques for efficient signaling of frequency resources in multiple cells. For example, a single downlink control information (DCI) transmission to a user equipment (UE) may be used to indicate a bandwidth part (BWP) switch to be applied in multiple cells. In some cases, the BWP switch may be into a pre-defined BWP across the multiple cells (and the same DCI may also schedule or trigger data or reference signals in the pre-defined BWP).
1. A method for wireless communications by a user equipment (UE), the method comprising:
receiving radio resource control (RRC) signaling associating a configured bandwidth part (BWP) in each of multiple cells with a same BWP identifier (ID);
receiving a downlink control information (DCI) that schedules or triggers at least one of: data or reference signal transmissions in the multiple cells, wherein the DCI carries the BWP-ID indicating to switch to the associated BWP in the multiple cells; and
switching to the configured BWP associated with the BWP-ID in each of the multiple cells.
2. The method of claim 1 , wherein each of the multiple cells is associated with a different component carrier (CC).
3. The method of claim 1 , wherein the BWP ID is a special BWP ID different from any other BWP ID used for any configured BWP in any of the multiple cells.
4. The method of claim 3 , wherein:
BWP IDs for configured BWPs in the multiple cells are within a range from 0 to a maximum number of BWPs per cell; and
the special BWP ID has a value outside the range.
5. The method of claim 1 , further comprising:
determining a time period, from receiving the DCI, before processing the data or reference signal transmissions in the multiple cells; and
processing the data or reference signal transmissions in the multiple cells after the time period.
6. The method of claim 5 , wherein the time period is determined based on a largest BWP switch delay across the multiple cells.
7. The method of claim 5 , wherein BWP switch delays depend on both UE capability and a sub-carrier spacing parameter before and after BWP switch.
8. A method for wireless communications by a network entity, the method comprising:
transmitting, to a user equipment (UE), radio resource control (RRC) signaling associating a configured bandwidth part (BWP) in each of multiple cells with a same BWP identifier (ID);
transmitting, to the UE, a downlink control information (DCI) that schedules or triggers at least one of: data or reference signal transmissions in the multiple cells, wherein the DCI carries the BWP-ID indicating to switch to the associated BWP in the multiple cells; and
communicating with the UE in the BWP associated with the BWP-ID in each of the multiple cells after the BWP switch.
9. The method of claim 8 , wherein each of the multiple cells is associated with a different component carrier (CC).
10. The method of claim 8 , wherein the BWP ID is a special BWP ID different from any other BWP ID used for any configured BWP in any of the multiple cells.
11. The method of claim 10 , wherein:
BWP IDs for configured BWPs in the multiple cells are within a range from 0 to a maximum number of BWPs per cell; and
the special BWP ID has a value outside the range.
12. The method of claim 8 , further comprising:
determining a time period, from transmitting the DCI, when the UE is expected to process signals in the multiple cells after receiving the DCI; and
communicating the data or reference signal transmissions with the UE in the multiple cells after the time period.
13. The method of claim 12 , wherein the time period is determined based on a cell with a largest BWP switch delay.
14. The method of claim 12 , wherein the BWP switch delays depend on both UE capability and a sub-carrier spacing parameter before and after BWP switch.