This book describes the technology involved in all aspects of a large networking system and how various devices can interact and communicate with each other. Using a bottom up approach authorsdemonstrate how feasible, for example, for mobile device users to communicate, through / all-purpose TCP IP protocol, with a wireless notebook computer user, across all the way through the base station in mobile wireless networks (eg, GSM, CDMA), public switched network (PSTN), Internet, intranet, local area network (LAN) and wireless LAN access point.