IMO and Beamforming In the event of a beam loss, the physical layer transmits an interruption signal to the MAC layer if the L1-RSRP power measurement is below a threshold Q (see Chapter 9). The MAC layer of the mobile initiates the random access procedure without contention to enable beam failure recovery. The PRACH procedure is performed in the initial BWP uplink. The mobile listens to the response in the initial BWP band. The beam loss detection and recovery procedure takes place in the following four stages: 1) the mobile detects a radio beam failure (the reception power measured on the L1-RSRP physical layer is below a threshold); 2) the mobile searches for another beam candidate with the strongest reception power; 3) the mobile starts a random access procedure without contention with the variable BFR-SSB-Resource.ra-PreambleIndex as a preamble; 4) the radio node transmits a RACH response with a DCI message. 6.7. References All standards can be downloaded from the ETSI website: https://www.etsi.org/ standards. 3GPP TS 38.211 NR - Physical Channels and Modulation; Version 16.1.0 Release 16 3GPP TS 38.214 NR - Physical layer procedures for data; Version 16.2.0 Release 16 3GPP TS 38.215 NR - Physical layer measurements; Version 16.2.0 Release 16 3GPP TS 38.321 NR - Medium Access Control (MAC) protocol specification; Version 12.2.0 Release 15 NG-RAN and 5G-NR 3GPP R1-1612661 TSG-RAN Advanced CSI Codebook Structure WG1 Meeting 87, 14th November - 18th November 2016 Su, X. and Chang, K.I. (2015). Polarized uniform linear array system: Beam radiation pattern, beamforming diversity order, and channel capacity. International Journal of Antennas and Propagation [Online]. Available at: https://doi.org/10.1155/2015/371236 5G-NR Radio Interface - Bandwidth Part 7.1. Bandwidth part A BandWidth Part (BWP) corresponds to an allocation of resources in the frequency domain. A BWP part is mobile specific. Several mobiles can be configured on the same BWP. CRBm-1 Point A Numerology u-0 Numerology u-1 Figure 7.1. Bandwidth part 