The book "Mobility Management" is a comprehensive introduction to the principles, technologies, and applications of mobility management. It is based on years of academic research and practical experience in the industry. The content is systematically organized and aligned with the reference models proposed by the authors. A particular focus is placed on technical principles, while the details of the protocols are not emphasized. The book provides an in-depth insight into existing technologies in the fields of mobile communication, mobile internet, and IMS/SIP, and compares them extensively. It is aimed at professionals in mobile communication, network engineers, researchers, and anyone involved in academic, industrial, or standardization activities in the field of mobility management.