band CSI-RS and partial band CSI-RS. In order to reduce beam management overhead and latency, the NR supports subtime units of less than one OFDM symbol in a reference numerology [73]. Each CSI-RS resource is configured by the RRC parameter NZP-CSI-RS-Resource. The time-domain locations of the two periodic CSI-RS resources in a slot or four periodic CSI-RS resources in two consecutive slots are given by le {4, 8}, le {5,9}, or le {6, 10} for FR1 and FR2; or le {0, 4}, le {1,5}, le {2, 6}, le {3, 7}, le{7,11}, le{8,12} or le{9,13} for FR2. A single-port 430 Chapter 4 CSI-RS resource with density P = 3 (see Table 4.2) and RRC parameter density is configured by CSI-RS-ResourceMapping. The bandwidth of the CSI-RS resource, given by RRC parameter freqBand configured by CSI-RS-ResourceMapping, is determined as min(52, NBWP(i) RB resource blocks or is equal to RB BWP(i) resource blocks. The UE is not expected to be configured with the periodicity of 2u X 10 slots, if the bandwidth of CSI-RS resource is larger than 52 resource blocks. The periodicity and slot offset, given by RRC parameter periodicityAndOffset configured by NZP-CSI-RS-Resource parameter, is one of 2"Xp slots where Xp = 10,20,40, or 80 [9]. It should be noted that the property of periodic, semi-persistent, or aperiodic is not a property of the CSI-RS per se, rather the property of a CSI-RS resource set. As a result, activation/deactivation and triggering of semi-persistent and aperiodic CSI-RS must be done for a set of CSI-RS within a resource set. In the case of periodic CSI-RS transmission, the UE can assume that a configured CSI-RS transmission occurs every Nth slot, where N ranges from 4 to 640. In addition to the periodicity, the device is also configured with a specific slot offset for the CSI-RS transmission. In the case of semi-persistent CSI-RS transmission, certain CSI-RS periodicity and slot offset are con- figured similar to periodic CSI-RS transmission. However, the CSI-RS transmission can be activated or deactivated via MAC control elements.