This book presents detailed description on the architectural design, core elements, functional components, protocols, radio layers, use cases, operation and implementation of 5G New Radio (NR) access technology based on 3GPP’s New Radio standards (Release 16 and Release 15). NG-RAN, Multi-Radio Dual Connectivity, Intra-NR mobility, Inter RAT mobility, Channel models and Integrated Access and Backhaul (IAB) architectures are also described. In addition, 5G System Architecture is presented in different perspective including Reference architecture for Non-roaming architectures and Roaming architectures, Reference architecture for Trusted and Untrusted Non-3GPP accesses and Interworking architecture with EPC. This book also describes the emerging technologies based on 5G-NR that includes Wireless and Wireline Convergence (WWC), Vehicle-to-Everything (V2X), Non-Terrestrial Networks Next Generation-Radio Access Network (NTN-NG-RAN), Ultra Reliable Low Latency Communication (URLLC), Multi-Access Edge Computing (MEC), NR Positioning, Network Function Virtualization (NFV) and Network Slicing, and 5G System Security. Furthermore, the book is appealing for researchers, developers and engineers to learn about design and development of 5G-NR systems and emerging technologies based on 5G-NR system. This book is perfect for professional engineers, researchers, system developers and graduate students who are working in wireless cellular communication systems, radio access technology, mobile broadband wireless standards, fixed mobile convergence, edge computing, network virtualization and slicing, and 5G system security.