s been scheduled with a downlink transmission spanning one slot. During the transmission to UE1, delay-sensitive data for UE2 arrives at the gNB, which immediately schedules a trans- mission to UE2. Typically, if there are frequency resources available, the transmission to UE2 is scheduled using resources not overlapping with the ongoing transmission to UE1. However, in a heavy-loaded network, this may not be possible and there is no option but to use some of the resources originally allocated to UE1 for the delay-sensitive transmission to UE2. We refer to this case as the transmission to UE2 preempting the transmission to UE1, which would experience temporary performance degradation because some of the resources that UE1 assumes to contain its own data contain data for UE2. If the value of the RRC parameter timeFrequencySet is one (frequency-domain preemption region boundary) then seven pairs of bits of a field in the DCI format 2_1 have a one-to- one mapping with seven groups of consecutive symbols where each of the first NINT - 7 NINT/7 symbol groups includes NINT/7 symbols, 7 - NINT 7 NINT/7 symbol groups includes NINT/7 symbols (as shown in Fig. 4.21). The first bit in a pair of bits for a symbol group is applicable to the subset of first BINT/2 PRBs from the set of BINT PRBs, and the second bit in the pair of bits for the symbol group is applicable to the subset of last BINT/2 PRBs from the set of BINT PRBs, a bit value of "0" indicates transmission to the UE in the corresponding symbol group and subset of PRBs, and a bit value of "1" indicates no transmission to the UE in the corresponding sym- bol group and subset of PRBs [8,13]. In relation to the dynamic slot configuration, if a UE is configured by RRC parameter SlotFormatIndicator, it will be provided with SFI-RNTI via higher layer parameter sfi- RNTI, and the payload size of DCI format 2_0 via RRC parameter dci-PayloadSize. The UE is also provided, in one or more serving cells, with a configuration for search space set S and the corresponding CORESET 