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1、TCPandUDPPerformanceforInternetoverOpticalPacket-SwitchedNetworksJingyiHe†S.-H.GaryChan‡†DepartmentofElectricalandElectronicEngineering‡DepartmentofComputerScienceHongKongUniversityofScienceandTechnologyClearWaterBay,KowloonHongKongAbstractOpticalpacket-switched(OPS)net
2、workisastrongcan-•Packetaggregation—InOPSnetworks,IPpacketsdestinedtodidateforthefutureOpticalInternet.Inthispaper,westudypacketthesamedestinationcanbeaggregatedtoformalargeropticalaggregationanddeflectionroutingasemployedinOPSnetworksonthepacket.Thisisnecessaryespeciall
3、ywhentheopticalswitchesperformanceofupperlayerInternetprotocolsrepresentedbyTCPandUDP.Regardingpacketaggregationschemes,westudynoaggregation,arenotfastenoughtoprocessindividualIPpackets.Clearly,mixed-flowaggregation,andper-flowaggregation.Ourresultsshowthatpacketaggregati
4、onimplieswaitingdelayforsomepackets.forbothTCPandUDP,mixed-flowaggregationachievesthehighestMoreover,anopticalpacketmaycontainmultiplepacketsfromthroughput,andper-flowaggregationsignificantlydecreasesthefairnessthesameflow.Whenitisdroppedormis-routedintheOPSatlargeaggregati
5、onintervals.BothaggregationschemesincreaseUDPnetwork,thethroughputoftheflowmaybeadverselyaffected.delayjitter.Regardingdeflectionrouting,weshowthatdeflectionroutingsignificantlyimprovesTCPthroughputinspiteoftheout-of-orderpacketInthisregard,howpacketaggregationaffectstheTCP
6、anddelivery.However,thecongestionofthedeflectionpathsignificantlyUDPperformanceisanimportantissue.Westudyinthispaperaffectstheimprovementthatcanbeachieved.UDPthroughputdoesthreeaggregationschemes:noaggregation,aggregatingpacketsnotsufferfromout-of-orderpacketdelivery,andh
7、enceitsthroughputfromheterogeneousflowsintoanopticalpacket(mixed-flowimprovementbydeflectionroutingcanbeevenmoreprominent.Thelargerthedeflectioncost(delaydifferencebetweenthedeflectionpathaggregation),andaggregatingpacketsfromthesameflow(per-andtheshortestpath)is,thelargerUDP
8、delayjitterresults.Deflectionflowaggregation).cost,however,doesnotaffectthethroughputandfairnessverymuchfor•Defle
