This book provides a clear, concise, complete and authoritative introduction to System Architecture Evolution (SAE) and the potential services and operational scenarios that it enables. After providing an insightful overview of SAE's historical development which explains why SAE was needed, the book gives detailed explanations of the key concepts as an introduction. Detailed technical descriptions of SAE follow, and which include detailed functional descriptions of the different components of SAE, protocols, network entities and procedures. Descriptions of SAE deployment scenarios show how the