tailieunhanh - IP for 3G - (P5)

IP Mobility This chapter will provide an overview of IP mobility. It aims to be pretty selfcontained, and so should stand alone fairly independently of the other chapters. IP mobility is very important, because it is predicted that the vast majority of terminals will be mobile in a few years and that the vast majority of traffic will originate from IP-based applications. The challenge of ‘IP mobility’ is to deliver IP-based applications to mobile terminals/users, even though, traditionally, IP-protocols have been designed with the assumption that they are stationary. | IP for 3G Networking Technologies for Mobile Communications Authored by Dave Wisely Phil Eardley Louise Burness Copyright 2002 John Wiley Sons Ltd ISBNs 0-471-48697-3 Hardback 0-470-84779-4 Electronic 5 IP Mobility Scope This chapter will provide an overview of IP mobility. It aims to be pretty selfcontained and so should stand alone fairly independently of the other chapters. IP mobility is very important because it is predicted that the vast majority of terminals will be mobile in a few years and that the vast majority of traffic will originate from IP-based applications. The challenge of IP mobility is to deliver IP-based applications to mobile terminals users even though traditionally IP-protocols have been designed with the assumption that they are stationary. In outline this chapter considers The distinction between personal and terminal mobility and between an identifier and a locator. For terminal mobility the distinction between macro or global and micro or local mobility. Tunnel-based and per-host forwarding approaches to micromobility -Their key features and how they compare. Other aspects of terminal mobility-Context or state transfer paging and security. As part of this the chapter includes an outline of various protocols SIP Session Initiation Protocol - Its use for personal and macromobility. Mobile IP - For macromobility. Hierarchical mobile IPv6 regional registration fast mobile IP for v4 and v6 cellular IP for v4 and v6 Hawaii MER-TORA - For micromobility. 144 IP MOBILITY The chapter does not consider MANETs mobile ad hoc networks networks without a fixed infrastructure1. In other words the chapter concentrates on how to cope with mobility in an IP network reminiscent of a traditional cellular network - that is a fixed network with base stations that provide wireless connections to mobile terminals. The treatment is at quite a high level the aim is to provide an introduction to the subject to enable the reader to understand what the key issues