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1、236IEEECOMMUNICATIONSSURVEYS&TUTORIALS,VOL.18,NO.1,FIRSTQUARTER2016NetworkFunctionVirtualization:State-of-the-ArtandResearchChallengesRashidMijumbi,JoanSerrat,Juan-LuisGorricho,NielsBouten,FilipDeTurck,SeniorMember,IEEE,andRaoufBoutaba,Fellow,IEEEAbstractNetworkfunctionvirtua
2、lization(NFV)hasdrawnonlyrequirehighandrapidlychangingskillsfortechnicianssignificantattentionfrombothindustryandacademiaasanim-operatingandmanagingthisequipment,butalsorequiresdenseportantshiftintelecommunicationserviceprovisioning.Bydecou-deploymentsofnetworkequipmentsuchasb
3、asestations.Allplingnetworkfunctions(NFs)fromthephysicaldevicesonwhichtheseleadtohighCAPEXandOPEXforTSPs[1],[2].theyrun,NFVhasthepotentialtoleadtosignificantreductionsinoperatingexpenses(OPEX)andcapitalexpenses(CAPEX)andMoreover,evenwiththesehighcustomerdemands,there-facilitat
4、ethedeploymentofnewserviceswithincreasedagilitysultingincreaseincapitalandoperationalcostscannotbetrans-andfastertime-to-value.TheNFVparadigmisstillinitsinfancylatedinhighersubscriptionfees,sinceTSPshavelearnedthatandthereisalargespectrumofopportunitiesfortheresearchduetotheh
5、ighcompetition,bothamongthemselvesandfromcommunitytodevelopnewarchitectures,systemsandapplica-servicesbeingprovidedover-the-topontheirdatachannels,tions,andtoevaluatealternativesandtrade-offsindevelopingtechnologiesforitssuccessfuldeployment.Inthispaper,afterincreasingpriceso
6、nlyleadstocustomerchurn.Therefore,TSPsdiscussingNFVanditsrelationshipwithcomplementaryfieldshavebeenforcedtofindwaysofbuildingmoredynamicandofsoftwaredefinednetworking(SDN)andcloudcomputing,weservice-awarenetworkswiththeobjectiveofreducingproductsurveythestate-of-the-artinNFV,an
7、didentifypromisingre-cycles,operating&capitalexpensesandimprovingservicesearchdirectionsinthisarea.WealsooverviewkeyNFVprojects,agility.standardizationefforts,earlyimplementations,usecases,andcommercialproducts.NFV[3],[4]hasbeenproposedasawaytoaddressthesechallengesbyleveragi
8、ngvirtualizationtechnologytoofferaIndexTermsNetworkfunctionvirtualiz
