mation. To support diverse use cases, NR features a highly flexible and unified CSI framework, in which there is reduced coupling between CSI measurements, CSI reporting and the actual downlink transmission compared to LTE. The CSI framework can be seen as a toolbox, where different CSI reporting settings and CSI-RS resource settings for channel and inter- ference measurements can be selected, SO that they correspond to the antenna configuration and transmission scheme in use such that the CSI reports on different beams can be dynami- cally triggered. The framework also supports more advanced schemes such as multi-point transmission and coordination. The control and data transmissions follow a self-contained principle, where all information required to decode the transmission (such as accompanying DM-RS) is contained within the transmission itself. As a result, the network can seamlessly change the transmission point or beam as the UE moves in the network. The CSI-RS refer- ence signals are used for CSI acquisition and beam management. The CSI-RS resources for a UE are configured by RRC information elements and can be dynamically activated/deacti- vated via MAC control elements or DCI [57]. The configuration and use of CSI-RS in NR can be defined via the CSI framework. As shown in Fig. 4.40, the basic units of CSI framework in NR are CSI reporting setting and CSI resource setting. The CSI reporting setting is linked to M resource settings for channel and interference measurements (CM and IM), where M = 1 indicates resource setting for channel measurement and beam management; M = 2 indicates resource settings for channel measurements and CSI-interference measurement (CSI-IM) or NZP CSI-RS for interference measurement; and M = 3 is an indication for resource settings for channel measurements and two resource settings for CSI-IM and NZP CSI-RS-based interference measurement. 498 Chapter 4 CSI resource CSI resource sets settings for CM CSI reporting CSI resource CSI resource sets settings 1 settings for IM CSI resour