ol Information (DCI) formats. DCI format Usage Scheduling of PUSCH in one cell Scheduling of PUSCH in one cell Scheduling of PDSCH in one cell Scheduling of PDSCH in one cell Notifying a group of UEs of the slot format Notifying a group of UEs of the PRB(s) and OFDM symbol(s) where UE may assume no transmission is intended for the UE Transmission of TPC commands for PUCCH and PUSCH Transmission of a group of TPC commands for SRS transmissions by one or more UEs 6.11 Physical Layer Procedures DCI 2_0 DCI 2_0 received received Format 0 Format 0 Format 0 Format 8 Format 1 Format 0 Format 0 Format 2 Format 2 Format 1 Bi-direct/Flexible SFI = 0 SFI = 1 Figure 6.28 Slot Format Indicator (SFI). transmission overlapping with the symbol. By indicating flexible symbol overlapping with a preconfigured DL/UL transmission or CORESET, a gNB may cancel the precon- figured transmission or prevent a UE or groups of UEs from monitoring the PDCCH in the CORESET. NR currently tabulates 64 slot formats. Format X in [3], however, the table is designed to carry up to 256 entries for future compatibility (Figure 6.28). DCI format 2_1, a so-called pre-emption indication or interrupted transmission indication DCI, is another broadcast format that is transmitted with specific RNTI (INT-RNTI) that can be common to a group (or all) UEs in the cell. This DCI format is used for notifying the UEs a set of time-frequency resources (RBs and OFDM symbols) that will not carry any information to the UE. The overall idea is that the UE may be first scheduled with a PDSCH, but later the gNB needs to take the already assigned resource to some other, more urgent use, for example, to transmit a URLLC data packet to someone. In this case, part of the already scheduled PDSCH is dropped, and the resources are used to transmit the more urgent PDSCH to someone else. The gNB can use the DCI format 2_1 to broadcast such a pre-emption case to the cell SO that the affected UEs can mark the pre-empted resources as erasures in the PDSCH decoding process and avoid t