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1、ComputerNetworks50(2006)128–144www.elsevier.com/locate/comnetAperformanceanalysisofcontexttransferprotocolsforQoSenabledinternetservicesa,*bN.Bartolini,E.CasalicchioaDepartmentofComputerScience,UniversityofRome‘‘LaSapienza’’,ViaSalaria113,Rome00198,ItalybDepartmentofComputerScience,Universit
2、yofRome‘‘TorVergata’’,Rome00133,ItalyReceived10January2005;receivedinrevisedform10January2005;accepted17February2005Availableonline5July2005ResponsibleEditor:Dr.G.MorabitoAbstractInnowadayswirelessnetworks,mobileusersfrequentlyaccessInternetservicesthatareoftenbasedoninformationconcerningthe
3、applicationcontextandservicestatus.Inpresenceofmobility,theprocedureofservicehandover,mayrequirearestartoftheongoingservice,ifthenecessarycontextinformationisnotproperlytransferredtothenewpointofaccess.Contexttransferproceduresintroduceadditionaloverheadstohandoverspossiblyaffectingthequality
4、ofser-viceperceivedbymobileusersandmakinghandoversverycritical.Inthispapertheneedforefficientprotocolsfortransferringservicecontextandprofilerelatedinformationispointedoutwithreferencetomanymobileinternetser-vices,andthepossiblescenariosaredifferentiatedonthebasisofthehandovertriggeringmechanism
5、s.Aperformancemodeltocomparethesemechanisms,whencontexttransferprotocolsrunontopofIPv6withfasthandover,ispro-posed.Numericalresultspointoutthenecessitytoadaptthetriggeringmechanismtothesizeofthecontextdata.Ó2005ElsevierB.V.Allrightsreserved.Keywords:Contexttransferprotocol;IPv6;Fasthandover;
6、Performanceanalysis1.IntroductionTheintroductionofseveralmultimediaservicesinnewgenerationofwirelessnetworks,broughtabouttheneedtodevelopefficientmethodsto*Correspondingauthor.Tel.:+390649918357;fax:+39managethemobilityofusers.Nowadaysinternet068541842.E-mailaddresses:novella@dsi.uniroma1.it(N
7、.Bartolini),servicesareoftensessionoriented,delayboundedcasalicchio@ing.uniroma2.it(E.Casalicchio).(orreal-time)andcontextsensitive.Justto1389-1286/$-seefrontmatterÓ2005ElsevierB.V.Allrightsreserved.doi:10.1016/j.comnet.2005.02.009N.Bartolini,E.Cas
