"Practical Research on 5G and IoT Communication Technologies" systematically elucidates the core principles, integration mechanisms, and engineering practice applications of the fifth-generation (5G) mobile communication technology and IoT communication technologies.The book covers 5G network architecture, wireless transmission and performance support technologies; systematically organizes short-range and wide-area IoT communication technologies, terminal access, and data transmission systems; and deeply analyzes key integration technologies such as heterogeneous network compatibility, deep integration of dual networks, and collaborative resource scheduling.Meanwhile, centering on practical operation key points such as large-bandwidth transmission, ultra-low-latency communication, and massive terminal access, the book elaborates on the construction of communication system engineering, quality-improving operation and maintenance methods, and real-scenario application solutions. It also provides forward-looking discussions on the iterative upgrading of communication technologies, the integration of emerging technologies, and cross-domain expansion, offering professional references for the theoretical research, engineering implementation, and innovative applications of 5G and IoT communication technologies.