2. The protocol architecture on the Xn interface 2.1.3. Protocol architecture on the F1 interface 2.1.4. Protocol stack on the NG interface NG-RAN and 5G-NR 2.2. Procedures on the radio network access 2.2.1. XnAP procedures 2.2.2. F1 interface procedures 2.2.3. NG-AP procedures 2.3. Identities of the XnAP and NG-AP application protocols 2.4. References Chapter 3. NG-RAN Network - Procedures 3.1. General procedure of the 5G-NSA mode 3.1.1. LTE search procedure 3.1.2. Random access procedure 3.1.3. Data transfer 3.1.4. Removing a secondary node 3.2. General procedures of the 5G-SA 3.2.1. Initial random access and beam management procedure 3.2.2. Establishment of radio connection 3.2.3. Register request 3.2.4. The procedure for establishing a PDU session 3.3. References Chapter 4. 5G-NR Radio Interface - The Physical Layer 4.1. 5G-NR radio interface 4.1.1. OFDM waveform 4.1.2. Frequency bands and multiplexing methods 4.1.3. NR frame structure 4.1.4. NR frame structure in the time domain 4.2. TDD mode configurations 4.2.1. Static configuration per cell 4.2.2. Specific TDD configuration 4.2.3. The dynamic configuration of the transmission for a group of mobiles 4.3. Physical resource 4.3.1. Resource grid 4.3.2. Resource bloc and bandwidth part 4.4. Physical channels and physical signals 4.4.1. Physical signals and reference signals 4.4.2. Physical channels 4.5. Downlink transmission 4.5.1. Synchronization signal 4.5.2. Reference signals 4.5.3. Physical control and data channels Contents 4.6. Transmission in uplink 4.6.1. Physical reference signals 4.6.2. The physical channel 4.7. References Chapter 5. 5G-NR Radio Interface - Operations on the Frequency Bands 5.1. Operations on the frequency bands 5.2. Carrier aggregation 5.2.1. Carrier aggregation in the FR1 band 5.2.2. Carrier aggregation in the FR2 band 5.3. Supplementary UpLink (SUL) 5.4. Synchronization on the secondary cell 5.4.1. Carrier aggregation procedure 5.4.2. SUL procedure 5.5. References Chapter 6. 5G-NR Radio Interface - MIMO and Beamforming 6.1. Multip