Study oflocal alternative adhocrouting protocol fortheexposed terminal problem

Ad-Hocnetwork isanautonomous network thatterminal communicates withthebasestation directly andthus consists ofonlymobile terminals without aninfrastructure suchdoesn't suffer fromtheexposed terminal problem. However asbasestations. Thewireless LAN system withIEEE802.11 someadhocrouting protocols arestrongly affected bythe standard isoneofthecandidate schemestorealize ad-hoc network. InIEEE802.11, CSMA/CA(Carrier Sense Multiple exposed terminal problem. InIEEE802.11, thelinkbreak Access with Collision Avoidance) isusedasaccess control method.isdetected byRTS/CTSmechanisms. Therefore thesender Moreover RTS/CTS(Request toSend/Clear toSend) mechanismterminal determines thelink break whentheCTSpacket isnot isimplemented tosolve thehidden terminal problem. Howeverreplied fromthereceiver terminal. Thismechanism iseffective itiswellknownthatRTS/CTSmechanism causes theexposedwhentheterminal ismoving, however itwill notworkwhen terminal probleminwhichthecommunication routebetween . . . ' terminals wouldbesuppressed. Inthispaper, we clarify the transm is is suse due tocthe e terminal . effect oftheexposed terminal problem tothead-hoc networks. problem. Thisisbecause thereceiver terminal cannot reply Moreover wepropose alocal alternative routing protocol methodCTSwhenthetransmission issuppressed bytheRTSfrom that prepares backuproutes toavoid thetemporary suppression other terminals. Hencethesender terminal detects thelink oftransmissions. Simulation results showthattheproposed break incorrectly evenifthereceiver terminal exists. methodcanprevent theroutereconstruction andimprove the Inthis paper, we proposealocalalterative routing protocol packetdelivery ratio.- foradhocnetworks tosolve theaboveexposed terminal Keywords- Ad hocnetwork, Routing protocol, Exposedproblem. Intheproposed protocol, neighbor terminals con- terminal problem struct backuproutes inadvance. Theseroutes areused whenthetransmission oftheterminal overthemainroute