P for monitoring the first Mps PDCCH candidates 456 Chapter 4 PDCCH with DCI Preempted format 2_1 resources (containing Downlink allocated preemption resources to UE2 indication) allocated to Uplink UE1 in slot n resources Slot n Slot n+1 Preemption indication monitoring period {1,2,4} slots 00001000100000 Preemption indication bitmap in DCI format 2_1 when timeFrequencySet = 0 PDCCH with DCI Preempted format 2_1 resources Downlink allocated (containing resources to UE2 preemption indication) allocated to Uplink UE1 in slot n resources 0000100 Preemption indication bitmap in DCI format 2_1 when timeFrequencySet= Slot n Slot n+1 Preemption indication monitoring period {1,2,4} slots Figure 4.21 Illustration of downlink preemption indication (interrupted transmission indication) [8]. related to DCI format 2_0 at aggregation level of LSFI CCEs to locate Type3-PDCCH com- mon search space. The DCI format 2_0 indicates a slot format corresponding to each slot in the downlink or uplink BWPs of a serving cell. The indication is communicated by setting the value of the SFI index in DCI format 2_0 for the serving cell to a combination of slot New Radio Access Physical Layer Aspects (Part 2) 457 formats for a number of slots. A slot format is identified by its corresponding index and the mapping between values of the SFI index and combinations of slot formats is signaled via RRC parameters [8]. In TDD operation mode, the UE is provided, via RRC signaling, with a reference subcarrier spacing configuration USFI for each slot format in a set of slot formats indicated by the SFI index in DCI format 2_0. An active downlink and uplink BWP pair are associated with sub- carrier spacing configuration HZUSFI Each slot format in the combination of slot formats is applicable to 2(H-HSFI) consecutive slots in the active downlink and uplink BWP pair where the first slot starts at the same time as the first slot for the reference subcarrier spac- ing configuration and each downlink, uplink, or flexible symbol for the reference subcarrier s