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Introduction Based on TD-LTE (Time Division-Long Term Evolution), this book adopts the modular teaching mode and applies the eNodeB equipment of Datang Mobile TD-LTE. Through the specific tasks in each module, it presents such contents as base station products, equipment installation, wireless technology, network testing, network planning and optimization, etc. in a comprehensive and detailed way. This book is divided into four training modules, namely, TD-LTE Equipment Cognition, TD-LTE Key Technologies, Network Test, Network Planning and Optimization. After learning the four training modules, learners can master the basic contents involved in the operation and maintenance of the mobile communications system, such as the hardware structure, maintenance and testing of the base station equipment, network planning and optimization. This book aims to cultivate high-quality skilled personnel who master the testing and optimization skills of base station and meet the requirements of standardized field maintenance operation. On the basis of traditional technical resources and training materials, the common knowledge points about network planning and optimization are extracted, and systematic thinking is highlighted. With strong operability and practicality, the chapter layout of this book is based on the working process and practical tasks. Besides, this book explains the basic concepts of mobile communication in a simple way, comprehensively introduces the process of construction and maintenance, test and optimization of the 4G base station, and carries out network test and analysis with Datang Outum software. This book can be used as the textbook of 4G communication technology courses for electronics, tele- communications and related majors of application-oriented universities and higher vocational colleges, as well as the reference book for mobile communications, network engineering professionals and engineering technicians.