ion indication/preemption indicator Uplink Power control commands for PUCCH and PUSCH Uplink Group power control for SRS Similar to LTE, NR supports two types of search spaces for PDCCH: common and UE-specific. A UE performs search of the possible DCI transmissions only in the specific time and frequency resources determined by the corresponding search spaces. The UE-specific search space is indicated to the UE after RRC connection establishment. However, the common search space, for example, for SIB1 transmission, is obtained in accordance with a predefined PDCCH candidates search scheme. PDCCH is used to transmit control information included in the DCI, indicates scheduling information for the transmitted downlink data, and provides grants for uplink transmission. DCI can be also used to convey other information to the UE such as activation or deac- tivation of the semi-persistent physical downlink shared channel (PDSCH) transmission, transmission of power control commands for PUSCH, PUCCH and Sounding Reference Signals (SRS), switching of the BWP, initiating a random access procedure, and notifying one or more UEs of the slot format. Similar to LTE, the type of information transmitted in the DCI is determined from the RNTI parameter of the DCI. Table 3.5.4 summarizes the DCI formats supported in NR (Release-15) (3GPP TS 38.212). 3.5.6 Uplink Control Channel NR uses the PUCCH to transmit uplink control information (UCI) from a UE to a gNB (3GPP TS 38.213). UCI consists of the following information: HARQ feedback, which is used to convey ACK/NACK information in response to PDSCH transmissions to the UE; CSI and beam reporting indicating the quality of the downlink channel, preferred digital precoding as well as information related to analog beamforming; In contrast to LTE, which typically supports PUCCH transmission at the edges of the car- rier bandwidth with a time span of one uplink subframe, the location and structure of the PUCCH in 5G NR is more flexible in time and frequency. Moreover, up to two PUCCH tra