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1、ACooperativeTDMAMACProtocolusingDynamicSlotAssignmentSchemeJong-KwanLee,Hong-JunNohandJaesungLimTacticalNetworkResearchCenterAjouUniversitySuwon,SouthKorea{jklee64,nonoboy,jaslim}@ajou.ac.krAbstractInthispaper,weproposeandanalyzeacooperativeproposedforenablingcoope
2、rativetransmissioninRayleighTDMAMACprotocolwithdynamicslotassignment.Ourproto-fadingchannelsandforimprovingtheprobabilityofcorrectcolallowsasourcenodetoretransmitfailedpacketcooperativelypacketreceptionandsystemthroughput.TheproposedC-duringaneighbornodesidleslot.T
3、hesourcenodecanselectTDMAimprovesthethroughputofconventionalTDMAbyidleslotsforacooperativeretransmissionbyasimplecontrolpacketexchangeamongneighbornodes.Theneighbornodesthatover40%.havethefailedpackettransmitduringtheselectedslotattheOntheotherhand,manydynamicslota
4、ssignemnetschemessametime.Iftherearenoidleslotsavailable,thecooperativehavebeenproposedforadhocnetworks[8-12].USAP[8]retransmissionisattemptedduringthesourcenodestimeslot.reservesthefirstslotofeachframeforsignaling.ItallowsThethroughputofTDMAcanbesignificantlyimprove
5、dbynodestoassignslotdynamicallyusingthereservedslot,buttheproposedcooperativeretransmissionschemeattheexpenseofincreasedoverhead.Weformulateananalyticmodelforslotutilizationisverylowduetoitsfixedframelength.USAP-theproposedprotocolforimplementationoverRayleighfading
6、MA[9]isanextensionversionofUSAPthatutilizesanchannelsandvalidateitbysimulation.Theresultsshowthattheadaptivebroadcastcycle(ABC)tochangetheframelengththroughputofTDMAsystemsisimprovedsignificantlyifthereandframecycledynamicallytoovercomethedrawbackofareasufficientnumb
7、erofidleslotsavailableforcooperativeitspreviousprotocol,USAP.However,USAP-MAspecifiesretransmission,eventhoughoverheadisintroduced.IndexTermscooperativeMACprotocol,wirelessnetworks,neitherhoworwhentochangetheframelengthnorhowtimedivisionmultipleaccess(TDMA),dynamics
8、lotassignment.toselectaslotassignedtoanewnode.InASAP[10]andE-ASAP[11],whicharebasedontheUSAPconcept,theframelengthisdefinedasapowerof2.Itcanbechan
