Few engineers understand both wireless networks and large scale IP networks - but both sets of skills will be indispensable to the engineers who will plan, design, architect, and implement tomorrow's next-generation 4G wireless networks. This is a complete guide to mobile IP networks and design for engineers participating at all levels - including those working for service providers, vendors, and application developers. The authors - all leading Cisco mobile IP experts - begin by reviewing the current state of mobile network design. They assess legacy radio technologies and RAN architectures, identifying technical and practical deficiencies, and showing how these can be overcome through the use of IP protocols. Next, they offer thorough technical explanations of how IP is currently being used for specific functions in mobile networks; as well as IP design theory adapted specifically for the unique challenges of mobile wireless networking.Readers will discover the key drivers behind the increasing utilization of IP in both mobile network transport and applications, and gain insight into the business and technical value of today's most significant service provider convergence initiatives. The authors conclude by previewing emerging trends and standards in mobility and IP networking, offering specific insights for defining effective network evolution plans.