 Once the CSI-RS transmission has been activated, the device can assume that the CSI-RS transmission will continue according to the configured periodicity until it is deactivated. Similarly, once the CSI-RS transmission has been deactivated, the device can assume that there will be no CSI-RS transmission according to the configuration until it is reactivated. In the case of aperiodic CSI-RS, no periodicity is configured, rather the UE is triggered via signaling in the DCI [9]. The CSI-RS may be further used for RSRP measurements3 and mobility management since NR does not include the cell-specific reference signals that were used in LTE for mobility management. The set of CSI-RS corresponding to a set of beams on which measurements are conducted should be included in the non-zero power (NZP)-CSI-RS resource set associ- ated with the report configuration. Such a resource set may either include a set of config- ured CSI-RS or a set of SS blocks. Measurements for beam management can be carried out on either CSI-RS or SS block. In the case of L1-RSRP measurements based on CSI-RS, the CSI-RS should be limited to single-port or dual-port CSI-RS. In the latter case, the reported L1-RSRP should be a linear average of the L1-RSRP measured on each port. The device can report measurements corresponding to up to four reference signals (CSI-RS or SS blocks), that is, up to four beams, in a single reporting instance. Each report is related to up to four reference signals or beams and includes the measured L1-RSRP for the strongest CSI-RSRP is defined as the linear average over the power contributions (in Watts) of the resource elements that carry CSI-RS configured for RSRP measurements within the identified measurement frequency region in the con- figured CSI-RS occasions. The CSI reference signals are transmitted on specific antenna ports. This measurement is applicable for connected mode only for both intra- and inter-frequency measurements. New Radio Access Physical Layer Aspects (Part 2) 431 beam and the difference between 