rence signal set contains a reference to either one or two downlink reference signals and an associated quasi co-location type (QCL-Type) for each one con- figured by an RRC parameter. The quasi co-location relationship is configured by the RRC parameter qcl-Type1 for the first downlink reference signal, and qcl-Type2 for the second downlink reference signal (if configured). The quasi co-location types corresponding to each reference signal are given by the RRC parameter qcl-Type in QCL-Info and may take one of the following values [9]: QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread} QCL-TypeB': {Doppler shift, Doppler spread} QCL-TypeC': {average delay, Doppler shift} QCL-TypeD': {Spatial RX parameter} 502 Chapter 4 The NR supports two types of spatial-resolution CSI: standard-resolution (Type I) and high-- resolution (Type II). The low-resolution CSI is targeted for SU-MIMO transmission since it relies on the UE receiver to suppress the inter-layer interference. This is possible since the number of received layers is less than the number of receiver antennas for a given UE. For MU-MIMO transmission, the number of received layers is typically larger than the number of receive antennas for the UE. The base station exploits beamforming/precoding to suppress inter-UE interference. Thus a higher resolution CSI, capturing more propagation paths of the channel, is needed to provide sufficient degrees of freedom at the transmitter [57]. In LTE, the UEs are configured with a transmission mode and a number of CSI reporting modes which are limited by complexity and scalability, whereas in NR, a modular frame- work is specified where a UE can be configured with one measurement setting, which includes N 1 CSI reporting and M > 1 CSI resource settings. A CSI resource setting can be associated with one or more reporting settings to flexibly support beam management and CSI acquisition, resulting in L 1 links. A UE can be dynamically assigned one or more reporting settings or links to generate the desir