ng. Multi-panel MIMO is expected to become promising for mmWave massive MIMO systems. The NR enables multi-panel antenna array operation through introduction of new reference signals, measurement, and reporting procedures. In this chapter, two of the unique NR MIMO features, that is, modular and high-resolution channel state information acquisition and beam management that distin- guish NR from LTE, are described. The modular framework is composed of three compo- nents, namely resource setting, CSI reporting setting, and measurement setting, which associates a resource setting with a reporting setting. These settings serve as building blocks that allow the network to customize the CSI measurement and reporting for a UE. To improve user throughput, a high-resolution dual-stage precoding referred to as Type II CSI is supported to allow more accurate estimation of the channel, thereby improving the efficiency of the NR MU-MIMO schemes. The associated codebook features a frequency non-selective basis subset selection coupled with a frequency-selective linear combination of amplitude and phase of the precoding vectors within the basis subset. As a result, the 5G NR. DOI: https://doi.org/10.1016/B978-0-08-102267-2.00021-X © 2019 Elsevier Inc. All rights reserved. 412 Chapter 4 precoding matrix indicator (PMI) for Type II CSI consists of several components, each with different frequency resolution. Since the NR is primarily geared toward MU-MIMO opera- tion, Type II CSI is complemented by Type I CSI designed for scenarios that do not require high spatial resolution, for example, SU-MIMO transmission. In order to establish and sustain a link for data transmission and reception, beam manage- ment enables the network to perform beam switching using physical-layer measurement and link quality reporting. Beam management is especially relevant for above-6 GHz frequency planning where both gNB and UE employ narrow beams for data transmission and recep- tion. The beam management can further be used for sub-6 GHz multi-TRP scena