or the transmission of SRS based on measurement of an associated NZP CSI-RS resource. A UE can be configured with only one NZP CSI-RS resource for the SRS resource set with higher layer parameter usage in SRS-ResourceSet set to "nonCodebook". If aperiodic SRS resource set is configured, the associated NZP-CSI-RS is indicated via SRS request field in DCI formats 0_1 and 1_1. A UE is not expected to update the SRS precoding information, if the gap between the last symbol of the reception of the aperiodic NZP-CSI-RS resource and the first symbol of the aperiodic SRS transmission is less than 42 OFDM symbols. The CSI-RS is located in the same slot as the SRS request field. If the UE is configured with aperiodic SRS associated with aperiodic NZP CSI-RS resource, none of the TCI states con- figured on the scheduled component carrier are configured with "QCL-TypeD". The UE performs one-to-one mapping between the indicated SRI(s) and the indicated DM-RS port (s) and their corresponding PUSCH layers provided by DCI format 0_1 or by configuredGrantConfig. The UE transmits PUSCH using the same antenna ports as the SRS port(s) in the SRS resource(s) indicated by SRI(s) given by DCI format 0_1 or by configuredGrantConfig. For non-codebook-based uplink transmission, the UE can be sched- uled with DCI format 0_1 when at least one SRS resource is configured in SRS-ResourceSet with usage set to "nonCodebook" [9]. 4.2.6 Link Adaptation and Power Control Power control is a mechanism where the transmit power of the downlink or uplink control or traffic channels are adjusted at the gNB or at UEs, based on instructions from the serving base station such that with minimal impact on the reliability of the downlink/uplink trans- missions and throughput, the inter-user/inter-cell interference among users and base stations 644 Chapter 4 are reduced. Therefore, power control can be considered as a link adaptation mechanism that is utilized for interference mitigation in cellular systems. While increasing the transmit power over a communicat