tions (from V2V to V2X), and SO on. These will help the readers to understand more advanced research materials for developing new ideas for B5G to make a contribution in this field for themselves. It is hoped that this book will serve as a virtual and effective bridge between academic research in theory and engineering development in practice. Preface Research Contributions This book attempts to explore the cutting-edge research developments in 5G and beyond technologies and is organized into 10 chapters. The chapter "A Comprehensive Study on 5G: RAN Architecture, Enabling Technologies, Challenges and Deployment" provides an insight into 5G E2E architectures for private and public networks based on the 3GPP, 5GPPP, and O-RAN alliance standards. Besides network virtualization and network slicing, strategies have also been presented along with R&D progress on 5G technologies. A comparative analysis of discussed RAN architectures that have been proposed by different standardization bodies helps to comprehend categorically the architectural differences, limitations, benefits, and deployment scenarios. The chapter "Information Flows at the Deep Physical Layer Level" describes the wireless communication process from a physical point of view introducing the "Deep Physical Layer" (DPL), located below the physical layer of the OSI model. Based on this model, the numerous solutions proposed for 6G that include intelligent modifications of the propagation environment can be seen as "data processing" at the DPL level in order to optimize the performance of the telecommunications system. The chapter "FBMC: A Waveform Candidate for Beyond 5G" investigates the design of FBMC-OQAM waveform based multiple-input multiple-output (MIMO) and multi-user massive MIMO systems. It starts with a brief description of the important features along with the differences of FBMC waveform over widely popular OFDM waveform, followed by the discussion over key challenges in designing FBMC-based MIMO and massive MIMO systems. To compare the perform