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1、◆OptimumCachingStrategiesforaTelcoCDNDannyDeVleeschauwerandDaveC.RobinsonInordertocopewiththerapidlyincreasingvideotraffic(bothdownloadedandstreamed)resultingfromInternetTV,atelecommunicationscompany(telco)candeployanetworkofcaches,whichsitclosertotheuserthanth
2、epoint-of-presenceofatraditionalcontentdistributionnetwork(CDN),likeAkamaiorLimelightNetworks.Thisnetworkofhighlydistributedcaches,oftenreferredtoasatelcoCDN,isanetworkenablerthatsavesahugeamountoftrafficonthelinkstowardtheInternetbyhandlinguserrequestslocallyw
3、ithouthavingtoretrievedatafromtheoriginserver.BecauseforInternetTVthesetofavailablecontentishugeandrapidlyevolving,thechoiceofthecachingalgorithmandcachecollaborationstrategycanhaveaconsiderableimpactonthereductionintraffic.Thecachingalgorithmdecideswhichobject
4、stocache,andthecachecollaborationstrategy,attimesincombinationwithpreloading,determineshowcacheableitemsarepropagatedthroughoutthetelcoCDN.InthispaperwedeterminethebestcombinationofacachingalgorithmandacachecollaborationstrategyforatelcoCDN.©2011Alcatel-Lucent
5、.IntroductionTheamountoftraffictransportedovertheduringwhichtheuserreadsorthinksaboutthecon-Internethasbeenincreasingsteadily[13].Inrecenttentjustdownloaded—intheformer,thecontentisyearsthisincreasehasbeendrivenbyasurgeincon-consumed(i.e.,watched,heard)asitisd
6、ownloading.sumptionofvideooverthenetwork.NotonlyareItfollowsthatvideocannotrelyonstatisticalmulti-theremorevideocomponentsembeddedintradi-plexingasmuchasdatacan,andthis,consequently,tionalWebpages(e.g.,newssiteswithvideofootage),putsevenmorestressonthenetwork.
7、morevideoservicesarealsoofferedovertheInternetBothtypesofservices(i.e.,dataandvideo)can(e.g.,catch-uptelevision,movies-on-demand,sitesdis-benefitfromacontentdistributionnetwork(CDN).tributinguser-generatedcontent,socialnetworkingsitesTheprincipleofaCDNisthatobj
8、ectsthatrequireahostingvideos).Itisestimatedthatinacoupleofyearslarge(andsustained)bitratetobedeliveredarefromnow,videotrafficwillconstitutemorethancachedinaCDNpointofpresence(PoP)c
