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1、WirelessNetworks11,507–521,2005C2005SpringerScience+BusinessMedia,Inc.ManufacturedinTheNetherlands.ARoutingProtocolforHierarchicalLEO/MEOSatelliteIPNetworksCHAOCHENBroadband&WirelessNetworkingLaboratory,SchoolofElectrical&ComputerEngineering,GeorgiaInstituteofTechnolo
2、gy,Atlanta,GA30332EYLEMEKICI?DepartmentofElectrical&ComputerEngineering,TheOhioStateUniversity,Columbus,OH43210Abstract.TherapidgrowthofInternet-basedapplicationspushesbroadbandsatellitenetworkstocarryonIPtraf?c.Inpreviouslyproposedconnectionlessroutingschemesinsatelli
3、tenetworks,themetricsusedtocalculatethepathsdonotre?ectthetotaldelayapacketmayexperience.Inthispaper,anewSatelliteGroupingandRoutingProtocol(SGRP)isdeveloped.Ineachsnapshotperiod,SGRPdividesLowEarthOrbit(LEO)satellitesintogroupsaccordingtothefootprintareaoftheMediumEar
4、thOrbit(MEO)satellites.BasedonthedelayreportssentbyLEOsatellites,MEOsatellitemanagerscomputetheminimum-delaypathsfortheirLEOmembers.Sincethesignalingtraf?cisphysicallyseparatedfromthedatatraf?c,linkcongestiondoesnotaffecttheresponsivenessofdelayreportingandroutingtable
5、calculation.Thesnapshotandgroupformationmethodsaswellasfastreactingmechanismstoaddresslinkcongestionandsatellitefailuresaredescribedindetail.TheperformanceofSGRPisevaluatedthroughsimulationsandanalysis.Keywords:satellitenetwork,connectionlessrouting,performance,LowEart
6、hOrbit(LEO),MediumEarthOrbit(MEO)1.Introductionresourceconsumption.ALEO/MEOtwo-tiersatellitenetworkandthecorrespondingroutingstrategiesaredescribedin[6].Satellitesystemshavetheadvantageofglobalcoverageandin-However,itisassumedthatthereisnodirectISLbetweenherentbroadcas
7、tcapability,andofferasolutionforprovidinganytwoLEOsatellites;allnetworkroutingfunctionsinvolvebroadbandaccesstoend-users.ComparedtoGeostationaryMEOsatellites.(GEO)satellites,LowEarthOrbit(LEO)andMediumEarthWiththerapidgrowthofInternet-basedapplications,pro-Orbit(MEO)sa
8、tellitenetworkshaveshorterroundtripdelaysposedbroadbandsatellitenetworkswillberequiredtotrans-andlowertransmissionpow
