lock number N. The RRC parameters tpc-PUSCH or tpc-PUCCH determine the index to the block number for a cell uplink, with the following fields defined for each block: (1) closed-loop indicator (0 or 1 bit) and (2) TPC command (2 bits). DCI Format 2_3 DCI format 2_3 is used for power control of uplink sounding reference signals for the UEs which have not linked the SRS power control to the PUSCH power con- trol, either because independent control was desirable, or the UE was configured without PUCCH and PUSCH. DCI format 2_3 structure is similar to DCI format 2_2, with the pos- sibility to individually configure 2 bits for SRS request in addition to the two power control bits. DCI format 2_3 is aligned with the size of DCI formats 0_0/1_0 to reduce the blind decoding complexity. DCI format 2_3 with CRC scrambled by TPC-SRS-RNTI carries block number 1, block number 2, block number N where the starting position of a block is determined by the parameter startingBitOfFormat2-3 provided by the higher layers for the UE configured with the block. If the UE is configured with RRC parameter srs-TPC- PDCCH-Group = typeA for an uplink carrier without PUCCH and PUSCH or when the SRS power control is not linked to PUSCH power control, in DCI format 2_3 one block is configured for the UE containing 0 or 2 bits of SRS request. The TPC commands TPC command number 1, TPC command number 2, TPC command number N apply to the respective carriers. If the UE is configured with RRC parameter srs-TPC-PDCCH- Group = typeB for an uplink carrier without PUCCH and PUSCH or an uplink carrier on which the SRS power control is not tied to PUSCH power control, one or more blocks are configured for the UE by the higher layers. In that case, each block applies to an uplink car- rier and DCI format 2_3 contains 0 or 2 bits of SRS request and 2 bits of TPC command. 4.1.3.2.4 Common and UE-Specific Search Spaces A UE may be configured with one or more CORESETs (using UE-specific or common sig- naling) with a maximum of three CORESETs per configured dow