Integrated Satellite-Terrestrial Network Fundamentals for Mobile Communications explores the critical role of integrated terrestrial-satellite networks in supporting the demands of 5G and 6G applications, including massive IoT, enhanced mobile broadband, and ultra-reliable low-latency communications. These networks are essential for providing geographic coverage and supporting mobility across platforms, such as ships, airplanes, vehicles, and trains. They also play a key role in offering backhaul services to base stations and enabling emergency response and disaster recovery communications. This book is a one-stop-shop for understanding these systems, providing practical guidelines for the implementation of NTN networks. It is suitable for both beginners and professionals, delving into technical challenges like power-limited link budgets, Doppler shifts from LEO satellites, nonlinear distortions, and hardware impairments, while providing practical solutions to overcome these issues.The book also examines the design of Low Earth Orbit (LEO) satellite constellations, the architecture of satellite networks, and the management of inter-satellite links, spectrum, and interference. Special attention is given to advanced concepts in satellite mobility management, including using virtual nodes and virtual topologies to streamline the operation of dynamic LEO constellations.This resource highlights future research directions and opportunities in areas like air interface techniques, data security, radio resource optimization, and large satellite constellation management. This is a comprehensive resource for researchers, engineers, and policymakers involved in the evolution of integrated terrestrial-satellite networks.