tailieunhanh - IP for 3G - (P7)

IP for 3G In this final chapter, it is appropriate to revisit the theme that started the book. Chapter 1 outlined some of the reasons why IP should be introduced into 3G networks; this chapter will explain in greater detail the technicalities of how IP could be introduced. One result will be that a network is developed that is much more faithful to the original ‘Martini’ vision than current 3G incarnations. This chapter will begin by applying the IP design principles, plus the QoS, mobility management, security and service creation pieces from the preceding chapters, to sketch out a vision of. | 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 7 IP for 3G Introduction In this final chapter it is appropriate to revisit the theme that started the book. Chapter 1 outlined some of the reasons why IP should be introduced into 3G networks this chapter will explain in greater detail the technicalities of how IP could be introduced. One result will be that a network is developed that is much more faithful to the original Martini vision than current 3G incarnations. This chapter will begin by applying the IP design principles plus the QoS mobility management security and service creation pieces from the preceding chapters to sketch out a vision of an all-IP mobile network. Of course this will be open to debate and will reveal the author s own prejudices about the meaning of all-IP . This is a serious point as the term all-IP has come to be used in several ways some of which do not adhere to the concepts outlined in this book. An IP architecture is in fact quite different from the traditional cellular systems that are defined by the network elements the interfaces between them and the protocols that run other those interfaces. The IP approach has very weak interfaces and largely concentrates on protocols - typically one protocol providing a single function - which are developed independently and are not tightly integrated to either each other or a particular underlying network structure. Another point is that there are still many holes that IP technology currently cannot fill - areas where work still needs to be done to replicate some of the functionality of the tightly inte-grated proprietary standards of 3G. Having outlined a vision for this all-IP future this chapter will detail an imaginary journey of a user of said network seeing how they are able to access all sorts of multimedia services and be able to .