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1、COMPNW2987No.ofPages17,DTD=5.0.1ARTICLEINPRESS5August2004DiskUsedComputerNetworksxxx(2004)xxx–xxxwww.elsevier.com/locate/comnet2AnadaptiveQoSframeworkforintegratedcellularandF3WLANnetworks4a,*aa5XinGangWang,GeyongMin,JohnE.Mellor,baOO6KhalidAl-Begain,LinGuan7aDepartmentof
2、Computing,SchoolofInformatics,UniversityofBradford,BradfordBD71DP,UK8bSchoolofComputing,UniversityofGlamorgan,WalesCF371DL,UKPR10Abstract11ThedesignofanetworkarchitecturethatcanefficientlyintegrateWLANandcellularnetworksisachallengingtask,12particularlywhentheobjectiveistom
3、aketheinteroperationbetweenthetwonetworksasseamlessandasefficientas13possible.Toprovideend-to-endqualityofservice(QoS)supportisoneofthekeystagestowardssuchagoal.Dueto14variousconstraints,suchastheunbalancedcapacityofthetwosystems,handofffromusermobilityandunreliable15transmi
4、ssionmedia,end-to-endQoSisdifficulttoguarantee.Inthispaper,weproposeagenericreservation-based16QoSmodelfortheintegratedcellularandWLANnetworks.Itusesanadaptationmechanismtoaddresstheabove17issuesandtosupportend-to-endQoS.Thevalidityoftheproposedschemeisdemonstratedviasimula
5、tionexperiments.18Theperformanceresultsrevealthatthisnewschemecanconsiderablyimprovethesystemresourceutilizationand19reducethecallblockingprobabilityandhandoffdroppingprobabilityoftheintegratednetworkswhilemaintaining20acceptableQoStotheendusers.ECTED21Ó2004ElsevierB.V.All
6、rightsreserved.22Keywords:WLANandcellularnetworkintegration;QoSframework;Reservation;Bandwidthadaptation231.Introduction24Inthefuture,wirelessserviceprovisionwillbe25characterisedbyglobalmobileaccessanywhere26*Correspondingauthor.andanytime[1].Thesemobilecommunicationsys-
7、27E-mailaddresses:x.g.wang@bradford.ac.uk(X.G.Wang),temswillincludedifferentaccesstechnologiessuch28g.min@bradford.ac.uk(G.Min),j.e.mellor@bradford.ac.uk(J.E.Mellor),kbegain@glam.ac.uk(K.Al-Begain),l.guan@-aswirelesslocalareanetworks(WLAN)andcellu-29bradford.ac.uk(L.Guan).
8、larnetworks,suchasglobalsystemformobile301389-1286/$-seefrontmatterUNCORRÓ2004ElsevierB.V.Allrig
