基于IP的全数字化视频服务家用型网关无线网络设备实时家庭无线网络.docx

基于IP的全数字化视频服务家用型网关无线网络设备实时家庭无线网络.docx

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基于IP的全数字化视频服务家用型网关无线网络设备实时家庭无线网络

Application-awareschedulingforVoIPinWirelessMeshNetworks 

ComputerNetworks

WirelessMeshNetworks（WMNs）areseenasameanstoprovidelastmileconnectionsinNextGenerationNetworks（NGNs）.Becauseoftheirauto-configurationcapabilitiesandthelowdeploymentcostWMNsareconsideredtobeanefficientsolutionforthesupportofmultiplevoice,videoanddataservicesinNGNs.ThispaperlooksattheoptimalprovisionofresourcesinWMNsforVoiceoverIP（VoIP）traffic,whichhasstrictperformancerequirementsintermsofdelay,jitterandpacketloss.InWMNs,becauseofthechallengesintroducedbywirelessmulti-hoptransmissionsandlimitedresources,providingperformancequalityforVoIPcomparabletothevoicequalityinthetraditionalcircuit-switchednetworksisamajorchallenge.

ThispaperanalysesdifferentschedulingmechanismsforTDMA-basedaccesscontrolinmeshnetworksasspecifiedintheIEEE802.16-2004WiMAXstandard.TheperformanceoftheVoIPapplicationswhendifferentschedulingmechanismsaredeployedisanalysedonavarietyoftopologiesusingns-2simulationandmathematicalanalysis.Thepaperconcludesthaton-demandschedulingofVoIPtraffic–typicallydeployedin802.11-basedWMNs–isnotabletoprovidetherequiredVoIPqualityinrealisticmeshWiMAXnetworkscenariosandisthereforenotoptimalfromanetworkoperator’spointofview.Instead,itisshown,thatcontinuousschedulingismuchbettersuitedtoserveVoIPtraffic.ThepaperthenproposesanewVoIP-awareresourcecoordinationschemeandshows,throughsimulation,thatthenewschemeisscalableandprovidesgoodqualityforVoIPserviceinawiderangeofnetworkscenarios.Theresultsshowninthepaperprovethatthenewschemeisresilienttoincreasinghopcount,increasingnumberofsimultaneousVoIPsessionsandthebackgroundtrafficloadinthenetwork.ComparedtootherresourcecoordinationschemestheVoIP-awareschedulersignificantlyincreasesthenumberofsupportedcalls.

Radioresourcemanagementinemergingheterogeneouswirelessnetworks  

ComputerCommunications

Deploymentofheterogeneouswirelessnetworksisspreadingthroughouttheworldasuserswanttobeconnectedanytime,anywhere,andanyhow.Meanwhile,theseusersareincreasinglyinterestedinmultimediaapplicationssuchasvideostreamingandVoiceoverIP（VoIP）,whichrequirestrictQualityofService（QoS）support.Provisioningnetworkresourceswithsuchconstraintsisachallengingtask.Infact,consideringtheavailabilityofvariousaccesstechnologies（WiFi,WiMAX,orcellularnetworks）,itisdifficultforanetworkoperatortofindreliablecriteriatoselectthebestnetworkthatensuresusersatisfactionwhilemaximizingnetworkutilization.DesigninganefficientRadioResourceManagement（RRM）,inthistypeofenvironment,ismandatoryforsolvingsuchproblems.InordertoprovideabetterunderstandingofRRM’sdesign,thispaperpresentsadetailedinvestigationofkeychallengesthatconstituteanefficientRRMframework.Moreimportantly,anoverviewwithaclassificationofrecentsolutions,intermsofdecisionmaking,isprovidedalongwiththediscussion.

VirtualizationarchitectureusingtheID/LocatorsplitconceptforFutureWirelessNetworks（FWNs）  

FutureWirelessNetworks（FWNs）willbeaconvergenceofmanyfixedandmobilenetworkingtechnologiesincludingcellular,wirelessLANs,andtraditionalwirednetworks.Thisunitedubiquitousnetworkwillconsistofbillionsofnetworkabledeviceswithdifferentnetworkinginterfaces.Acommonnetworkingprotocolisrequiredtocommunicateamongthesedevicesandinterfaces;SystemArchitectureEvolution（SAE）documentsstatethatInternetProtocol（IP）,world-widelyusedinthecurrentInternet,islikelytobecomethatcommonprotocol.However,traditionalIParchitecturehasfacedseveralknownchallenges,suchasmobility,multihoming,privacy,pathpreferenceselection,etc.,whichshouldberesolvedinFWNs.OneofthedifficultiesinthecurrentIParchitectureistheoverloadingofIPaddressesusedbothastheidentityandthelocationofIPdevices.Inthispaper,weproposeavirtualizationconceptfornetworkablecomponents,or（virtual）objects,whichgeneralizesallabstractcomponentstopotentiallybeusedinFWNs.Inaddition,wehaveexplicitlyseparatedthefunctionsofthevirtualobjectidentityfromthevirtualobjectlocation（usingtheID/locatorsplitconcept）.Theend-to-endcommunicationisaconcatenationoftheinvolvedcomponents,calledachannel.Tohelpsupporttheownershipandpolicyenforcementfortrustedvs.untrustednetworks,asetof（virtual）networkablecomponentswiththesameinterest,calledarealm,isformedinamulti-tierstructure.Theindividualpolicycanbeenforcedforeachindividualgroupof（virtual）objectsand/orchannels.T