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2010-12-81bia+LiuXin-jun,LuoZi-jun,ChangChao-wen,XuJiang-ke,WuShao-jieAbstract:Aimingattheproblemofverticalhandoffinheterogeneousnetworks,animprovedTOPSIS(techniquefororderpreferencebysimilaritytoidealsolution,TOPSIS)algorithmusingIEEE802.21MIHfunctionisproposedtoimproveandrationalizetheeffectofthehandoffbetweentheheterogeneousnetworks.Inthispaper,conceptionsofconnectionnumbersandareintroduced,thennewmethodsofascertainingtheattributeweighsandexpressingthefuzzyattributesareproposedbasedonbia+connectionnumbers,andthetraditionalTOPSISalgorithmisimprovedaccordingly,.Then,thehandoffprocessandstructureareanalyzedandbuiltbasingonIEEE802.21MIH.Atlast,asimulationisintroducedtotestifythismethodandsimulationresultsshowthenewmethodsintroducedinthispapercanimprovetheaccuracyofaccessselectionforheterogeneousnetworks.Keywords:heterogeneousnetworks,verticalhandoff,IEEE802.21MIH,connectionnumbers,improvedTOPSIS2011-3-1416:57=CBA,,i)(aA)(bB)(cCABii]1,1[−∈ii2010-12-83bia+nAAA3,,21muuu3,,21m)]/()[(minmaxmin−−=ip)(max1maxijmjixf≤≤=)(min1minijmjixf≤≤=ipiiijijffxy)]/([minmax+=ipiijijfxy)/(max=ipiiijiijffxxy)]/()[(minmaxmax−−=1MIHWLAN2345MIH2010-12-84ipiiijijffxy)]/([1minmax+−=i1.07.0+i1.03.0+i1.05.0+i1.03.0+i1.05.0+i1.09.0+XmniMijCjjwjCiMjCijxijxnmijxX×=)(mnijyY×=)()(ijrR=ijjijywr×=+s−s},,2,1|{mjssj3==++mjrsniijj,,2,1}max{13==∑+},,2,1|{mjssj3==−−mjrsniijj,,2,1}min{13==∑−∑=++−=mjijjirsd12)(∑=−−−=mjijjirsd12)(iσ)/(−+−+=iiiidddσ2010-12-85requestEvaluation_responseNQV_requestEvaluation_responseNQV_4635.01=σ309.02=σ703.03=σ25.04=σ2010-12-86σCAMADMvague[15]vague10.30.50.50.380.140.240.24vaguevagueCATOPSISvague66TOPSISvague/TOPSISvague0.380.140.240.24CABDCABD,,,,QoS2770-27712010-12-87Sung-joonCho,Tae-wookMoon,MoonKimAstudyonIEEE802.21MIHframeworksinheterogeneouswirelessnetworks[C]11thInternationalConferenceonadvancedcommunicationtechnology