network architecture separates the control plane to the user plane. The 5G-NSA and the 5G-SA architectures will be described by detailing interfaces and applications between the radio access entities and between the radio access and the network core (NG interfaces). Chapter 3 presents general procedures for 5G-NSA and 5G-SA modes. It describes the procedures on the radio access network concerning the cell search, the bearer establishment, the mobility management, the management of the secondary node, the beam management, as well as the procedures to the core network such as attachment and session establishment. 5G-NR spectrum allocation is more flexible compared to 4G LTE. In the time domain, frame flexibility is improved with the introduction of new numerologies. In the frequency domain, flexibility is achieved with bandwidth partitioning allocated to the terminals. In order to avoid future development constraints, the management of the radio band is refined. Chapter 3 describes the reference signals, physical signals, physical channels and their allocation on the 5G bandwidth. 5G improves the user's throughput with active antenna technologies. Spatial multiplexing improvements are presented in both FR1 and FR2 bands. This chapter describes single- and multi-panel antennas, which require new measurements of the CSI radio channel. To achieve 20 Gbps in the downlink direction and 10 Gbps in the uplink direction, the 5G-NR radio interface needs the following characteristics: - the maximum radio channel bandwidth is 100 MHz for the FR1 band and 400 MHz for the FR2 band; - carrier aggregation allows us to extend the channel bandwidth to 1 GHz; - 256-QAM (Quadrature Amplitude Modulation); - MIMO (Multiple Input Multiple Output) 8x8 transmission mode is used in downlink. Chapter 4 presents the 5G-NR physical layer. It describes uplink and downlink waveform formats, multiplexing modes, the 5G frequency bands and radio frames. Physical signals and physical channels on the uplink and downlink are detailed (uplink physical