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1、PASSASLAYOUT12/14/075:18PMPage64MOBILEINTERNETTECHNOLOGIESANDAPPLICATIONSMedia-IndependentHandoverforSeamlessServiceProvisioninHeterogeneousNetworksGeorgeLampropoulos,UniversityofAthensApostolisK.Salkintzis,MotorolaNikosPassas,UniversityofAthensABSTRACTnetworkcapacityandt
2、heavailabilityoftheirser-vices.TheperformanceofcurrentInternetappli-Seamlessmobilitycanbeachievedbycationsisbasedmainlyonthecapabilitiesofenablingmobileterminalstoconductseamlesstheunderlyingnetworktechnologies.Modernhandoversacrossdiverseaccessnetworks,thatis,accesssyste
3、msusuallycansatisfydelay,loss,seamlesslytransferandcontinuetheirongoingorbandwidthrequirements;however,designsessionsfromoneaccessnetworktoanother.Ainconsistenciescanleadtoservicedegradationseamlesshandoveristypicallycharacterizedbyastheterminalsmoveacrossdifferentsystems
4、.twoperformancemetrics:Inthisarticle,thefocalpointisthesatisfac-•Thehandoverlatencyshouldbenomoretionofservicerequirementsduringmobilitythanafewhundredmilliseconds.andmorespecifically,howtheemergingIEEE•TheQoSprovidedbythesourceandtarget802.21standardenablesseamless,inter
5、-tech-systemsshouldbenearlyidentical(orthenologyhandover.Basedonpriorworkandausershouldnotperceiveanychangetohiswell-knownexampleofseamlessmobility,thecommunicationexperienceafterthehan-mainseamlessmobilityprinciplesareidenti-dover).fiedandusedasthebasisforfurtherevaluat-
6、ThesetwoperformancerequirementsarenotingthepotentialoftheIEEE802.21standardtrivialtosatisfywhendifferentaccessnetworkstomeettherequirementsofapplicationsforarecombinedinasinglearchitecture,becauseminimumdisruptionduringaninter-technolo-minimumservicedataflowinterruptionus
7、uallygyhandover.canbeachievedbynetworkswithtight-couplingmechanismsacrossthem(suchasGSMEDGEradioaccessnetwork(GERAN)andUMTSter)'20.870210.00001TD0Tc(-restrialradioaccessnetwork(UTRAN)[2],INTRODUCTIONspecifiedby3GPP),andQoSprovisionattheNewInternetapplicationsandservicesar
8、econ-targetsystemrequiresmappingofspecificQoSstantlybeingintroduced.Tobesuccessful,theyattribute
