ons Working with IoT 6.5.3 IoT Domain from the 3GPP Point of View 6.5.4 Implications to UEs 6.5.5 Implications to 3GPP Networks Chapter Summary References Index Foreword I have been fortunate to have first been involved in the Internet when it was still a relatively small research project at ARPA. I worked at Bolt, Beranek, and Newman in Cambridge, Massachusetts, on the Arpanet and the early Internet starting in 1978. It was definitely being at the right place at the right time. I was able to work with the people who really did invent the Internet. I was part of the research groups that evolved into what is now the organization that standardizes the core Internet protocols: the Internet Engineering Task Force (IETF). In the early 1990s we realized that there was going to be a problem with the size of the address space used in the current version of the Internet protocol, IPv4. We could see that the Class-B part of the IPv4 address space was rapidly being consumed. Note that this was well before the World Wide Web (WWW) was a factor in growth, the Internet largely consisted of connecting universities and research organizations. Applications were pretty basic. Even then we were seeing rapid growth, though in hindsight it was only a hint as to what was to happen later. This resulted in starting a project in the IETF to create a new version of the Internet Protocol. This was called the IP next generation (IPng) program. A number of different approaches were considered. A lot of effort was invested in all of the proposals and as you would expect a very vigorous debate ensued. In the end, the protocol we now call IP version 6 (IPv6) was selected. Stephen Deering and I led this effort. The development of a new version of the Internet Protocol solved two problems, one technical and one political. The political problem, that is easy to forget now, is that at the time the TCP/IP Internet was not a sure thing. It wasn't supported by the large telecoms of the time, by governments, or by official standards bodies like ANSI an