rements the UE performs on nonzero power CSI-RS or the SS Block are basic L1-RSRP computations. In this way, the UE finds out the strength of the best beams and reports that to the gNB. The UE is not expected to be configured with more than 64 nonzero power CSI-RS resources for channel measurement for a CSI report. The reported L1-RSRP values are defined by a 7-bit value in the range [-140, -44] dBm with a 1 dB step size. A UE having one or multiple panels may receive the CSI-RS/SS Blocks with the same spatial filter, and hence with the same beam. It is important for the gNB to know this information, as the transmission on beams received by the same UE Rx beam can occur with more dynamic scheduling, as the RX beam change at the UE is not needed. In Figure 6.36, we have an example where the UE is equipped with two receive panels. Several beams from the same Transmission Reception Point (TRP) may be received by the same beam, and hence the striped Tx beams are received by the striped Rx beam, and the same is true for the square beams. If the UE detects such a configuration, the reporting occurs under the so-called group-based bream reporting. 6.12.2.3 Beam Indication: QCL and Transmission Configuration Indicator (TCI) The network can indicate to the UE how the signals are transmitted with respect to each other in time. To be more specific, even from the LTE times, the system evolved to a flexible configuration where signals from the UE may arrive from any direction as transmission points can send information to the same UE at the same time (as in Figure 6.36 Beam grouping. Beams on panel 2 Beams on panel 1 6 5G Physical Layer coordinated joint transmission) or they can dynamically alternate in time (as in dynamic point selection). To make such operation possible, the rules of QCL (quasi-colocation) has been introduced. These rules link reference signals to each other with respect to how they have been transmitted. Why is this needed? Because the UE performs channel estimation, and it needs to know how the estimatio