WirelessnetworksareevolvingintowirelessIP(InternetProtocol)networksto
overcomethelimitationsoftraditionalcircuit-switchedwirelessnetworks.Wireless
IPnetworksaremoresuitableforsupportingtherapidlygrowingmobiledataand
multimediaapplications.IPtechnologiesbringthegloballysuccessfulInternet
servicecreationandofferingparadigmtowirelessnetworks,bringingthevastarray
ofInternetservicestomobileusersandprovidingasuccessfulplatformforfostering
futuremobileservices.IP-basedprotocols,whichareindependentoftheunderlying
radiotechnologies,arealsobettersuitedforsupportingseamlessservicesover
heterogeneousradiotechnologiesandforachievingglobalroaming.
Wirelessnetworksareevolvingontwomajorfronts.First,radioaccesssystems
areevolvingtothirdandfourthgenerationsystemsthatcansupportsignificantly
highersystemcapacityandper-userdatarateswithenhancedquality-of-service
(QoS)supportcapabilities.Second,wirelessIPnetworkingtechnologiesare
profoundlychangingtheoverallwirelessnetworkarchitecturesandprotocols.
Manybooksareavailableonradioaccesssystems,examiningthephysical,link,
andnetworklayersspecifictoeachradiosystem.Fewbooks,however,havebeen
designedtosystemicallyaddressthewirelessIPnetworkingaspect,i.e.,archi-
tectures,protocols,andtechniquesattheIPlayerandaboveofawirelessIP
network.Thisbookseekstoprovideasystematicdescriptionandcomparisonof
next-generationwirelessIPnetworkarchitectures,systems,andprotocols,witha
focusontheIPlayerandabove.
SeveralmajoreffortshaveemergedtodefineglobalstandardsforwirelessIP
networks.Thetwomostinfluentialstandardsbodiesare3GPP(ThirdGeneration
PartnershipProject)and3GPP2(ThirdGenerationPartnershipProject2).Different
standardseffortshavebeentakingsignificantlydifferentapproaches,whichleadto
differentarchitecturesanddifferentmigrationpathstowardfuturewirelessIP
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networks.ThisbookprovidesinsightsintocriticalissuesinwirelessIPnetworking,
thoroughlyillustratesthestandardsandnetworkarchitecturesdefinedbyleading
standardsbodiessuchas3GPPand3GPP2,anddiscussesindetailprotocols
andtechniquesinfourmajortechnicalareas:signaling,mobility,security,and
QoS.
Toprovidethenecessarybackground,thebookstartsbypresentingahistorical
overviewoftheevolutionofwirelessnetworksinChapter1,Introduction.Chapter1
thenreviewstheevolutionofpublicmobileservicesbyexaminingthefirst,second,
andcurrentwavesofmobiledataservices.Itcontinuesontodiscussthemotivations
forIP-basedwirelessnetworksandprovidesanoverviewofrelatedstandards
activities.
Chapter2detailsthenetworkarchitecturesdefinedby3GPPand3GPP2.Tohelp
readersquicklygetasenseofthesolutionsproposedby3GPPand3GPP2andto
easilyidentifytheirfundamentaldifferences,Chapter2presentsthemostimportant
aspectsofthearchitecturesproposedby3GPPand3GPP2inaconsistentformatand
highlightstheirmajordifferences.Inaddition,theall-IPmobilenetworkarchitecture
proposedbytheMobileWirelessInternetForum(MWIF)isalsodiscussed.
Chapters3to6addresssystematicallyfourofthemostcriticaltopicareasinnext-
generationwirelessnetworks:signaling,mobilitymanagement,security,andQoS.
BecauseChapter2discussesnetwork-layersignalingandcontrolnecessaryforthe
operationsofthenetworks,Chapter3focusesonapplication-levelsignalingand
sessioncontrolneededtosupportreal-timeandmultimediaapplicationsinIP
networksandintheIPMultimediaSubsystems(IMS)definedby3GPPand3GPP2.
Chapters4,5,and6discussissuesandsolutionsrelatedtomobilitymanagement,
networksecurity,andQoS,respectively.EachchapterlooksfirstatthesubjectinIP
networks,thenatthearchitecturesandprotocolsdefinedby3GPPand3GPP2.The
MWIFspecificationsarediscussedinsomechaptersifrelatedissuesinMWIFare
alsoaddressed.
Thebookisdesignedprimarilyforresearchers,engineers,technicalmanagers,
andgraduateandundergraduatestudents.PeopleenteringthefieldofwirelessIP
networkingwillalsofindthisbookahelpfulreference.Thebookemphasizesthe
principlesunderlyingeachmajorarchitectureandillustratestheseprincipleswith
abundanttechnicaldetails.Itprovidestheaudiencewithperspectivesthatare
difficulttoobtainfromreadingthestandardsspecificationsdirectly.
WearegratefultotheITSUMO(InternetTechnologiesSupportingUniversal
MobileOperation)teamfromTelcordiaTechnologies,Inc.andToshibaAmerica
Research,Inc.(TARI).OurworkontheITSUMOprojectanddiscussionswiththe
ITSUMOmemberscontributedtothebook.SpecialthanksareduetoDr.Prathima
AgrawalofTelcordiaandDr.ToshikazuKodamaofTARIfortheircontinuous
supportandinvaluableadvicethroughoutthewritingofthebook.WethankMr.
Chi-ChenLee,Mr.Jui-HungYeh,andMr.Chih-HsingLinoftheNationalTsing
HuaUniversityforpreparingmanyofthefigures,tables,andreferencesinthebook.
Jyh-ChengChenwouldalsoliketoacknowledgetheprojectmembersofthe
“ProgramforPromotingAcademicExcellenceofUniversities”formanyinsightful
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PREFACE
discussions.Jyh-ChengChen’sworkwassupportedinpartbytheMinistryof
Education,Taiwan,NationalScienceCouncil(NSC),andIndustrialTechnology
ResearchInstitute(ITRI).
Jyh-ChengChen
TaoZhang
