无线系统冲突数据包重传协议进程号.pdf

Collision-freePacketRetransmissionProtocolforWireless

CSMASystems

†††

KazuyukiOzaki,TakayoshiNakayama,YunWen,HiroshiFujita

†FujitsuLaboratoriesLtd

4-1-1,Kamikodanaka,Nakahara-ku,Kawasaki211-8588Japan

†{ozaki_kazuyuki,n.takayoshi,wen.yun,fujitsa}@

—Recently,wirelessnetworksusingISMbandhavebeenseveralscenarios.Therefore,althoughthecollisionsbythe

attractingalotofattention.InthesesystemsusingcarriersensehiddenterminalcanbeavoidedbyusingCSMA/CAwith

multipleaccesswithcollisionavoidance(CSMA/CA),thepacketRTS/CTS,thisapproachisnotusuallyusedinrealsituation.

collisionandrecollisionbetweenhiddennodesoccurfrequently

anddrasticallydecreasethenetwork(NW)capacity.InthisIfthereceivercandetectthepacketcollision,itcanbe

paper,weproposeapacketretransmissionprotocoltoavoidthedonesothatthereceivercontrolsthesenodeswhosetransmit

packetrecollisionin1hopmany-to-onenetwork,inwhichallpackethascollidedatthereceiverasthesenodes’retransmit

nodessendtheirpacketstoanaccesspoint(AP).Inourproposedpacketscanbereceivedcorrectlywithoutcollision.Hence,we

retransmissionprotocol,hiddennodeswhosefirsttransmittedcanpreventthedegradationofsystemthroughput.Recently,

packetislostcontroltheirretransm