le broadband. However, mobile Internet access is not a new technology - it has been available since the beginning of the 2000s, but only during the past last few years has the growth of mobile usage of the Internet exploded. This explosion is due to the increased data speeds that have brought mobile Internet access speeds close to those of fixed broadband access, and the prices dropping to affordable and competitive ranges. In addition, the exploding usage is due in very large part to the introduction of the smartphone. At the same time, and partly as a result, the Internet is facing its biggest change and its biggest challenge since its introduction. This is the transition to the new version of the Internet Protocol (IP) - IP version 6. The old version - IP version 4 (IPv4) - has been in use since 1983 when the ARPANET transitioned from Network Control Program (NCP) to the Internet Protocol. Now, the exhaustion of readily available Internet Protocol version 4 (IPv4) addresses at the beginning of 2011 puts the growth of the whole Internet at risk. The ongoing transition of the Internet to the new version of IP will, obviously, have implications for mobile networks as well. We have written this book to look at these important two topics together - mobile broadband access to the Internet, and the transition to Internet Protocol version 6 (IPv6). In Chapter 1, we start with an overview of the Internet technologies, and the background and implications of the transition to IPv6 to the Internet. Chapter 2 explains the basics of the Third Generation Partnership Project (3GPP) specified mobile broadband technologies, and Chapter 3 examines the IPv6 technology, giving a good understanding of how IPv6 works. Chapter 4 goes through how IPv6 is intended to work in the 3GPP mobile broadband networks. Chapter 5 concentrates on giving an understanding of different transition strategies that can be used in 3GPP networks. Chapter 6 gives a forward-looking view by the authors of some areas relevant to the future of IPv6 in 3GPP ne