ons. To ensure the reliability of the ongoing services while supporting the URLLC transmission, robustness improvement and service sharing strategies may be adopted [68]. An NR UE can be configured to monitor group-common signaling via DCI format 2_1 which carries preemption indication related to multiplexing eMBB and URLLC traffic with different transmission durations in the downlink. Upon reception of preemption indication, a UE should apply an appropriate HARQ combining mechanism to retrieve the data despite the missing portion due to preemption. Group-common PDCCH is designed for the purpose of signaling to a group of UEs. It carries dynamic SFI, that is, via DCI format 2_0, to indi- cate which symbols in a slot are designated as downlink, uplink, or flexible symbols. The SFI carries an index to a UE-specific table containing permissible slot configurations [6]. The downlink preemption indicator is signaled via DCI format 2_1; however, whether a UE needs to monitor preemption indication is configured through RRC signaling. The UE is additionally configured with a set of serving cells; a mapping for each serving cell in the set of serving cells to the corresponding fields in DCI format 2_1; an information payload size for DCI format 2_1; and a bitmap for identification of punctured time-frequency resources via higher layer signaling. If the UE detects a DCI format 2_1 for a serving cell from the configured set of serving cells, the UE may assume that there is no transmission assigned to the UE in PRBs and symbols within the active downlink BWP, from a set of PRBs and a set of symbols of the last monitoring period, that are indicated by DCI format 2_1. Note that DCI format 2_1 indication is not applicable to the reception of SS/PBCH blocks [8]. A UE needs to monitor preemption indication carried by DCI format 2_1, if it is provided with RRC parameter DownlinkPreemption and it is configured with an INT-RNTI provided by RRC parameter int-RNTI. In that case, if the UE detects DCI format 2_1, the set of sym- bols i