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HSDPA系统中HARQ性能的比较与分析.docx

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HSDPA系统中HARQ性能的比较与分析 Introduction HSDPA(High-SpeedDownlinkPacketAccess)isawirelesscommunicationprotocolthatprovideshigh-speeddatatransferfromthebasestationtotheuserequipment(UE).HSDPAusesvarioustechniquestoimprovedatatransferrateandcapacity,includingHARQ(HybridAutomaticRepeatRequest). HARQisatechniquethatcombinestwotypesoferrorcorrectionmethods:AutomaticRepeatRequest(ARQ)andForwardErrorCorrection(FEC).InHSDPA,theHARQtechniqueisusedtoimprovethereliabilityandefficiencyofthedatatransferprocess.ThispaperwilldiscusstheperformancecomparisonandanalysisoftheHARQtechniqueinHSDPA. HARQinHSDPA HARQisatechniquethatenablesthereceivertodetectandcorrecterrorsinthereceiveddata.InHSDPA,HARQisusedforretransmissionofdatapacketsthatarelostorcorruptedduringthedatatransferprocess.HARQcomprisestwotypesoferrorcorrectionmethods:ARQandFEC. ARQisatechniqueinwhichthereceiversendsarequesttothesendertoresenddatapacketsthatarelostorcorruptedduringthedatatransferprocess.ARQisusedinHSDPAforretransmissionofthedatapacketsthatarelostorcorruptedduringthedatatransferprocess.ARQisareliableerrorcorrectionmethodthatensuresthatthelostorcorrupteddatapacketsareretransmitted. FECisatechniqueinwhichadditionaldatabitsareaddedtotheoriginaldatapackettoprotectitfromerrorsduringtransmission.FECisusedinHSDPAtoencodetheoriginaldatapacketwithadditionalbitstoprotectitfromerrorsduringthedatatransferprocess.FECisalessreliableerrorcorrectionmethodthanARQbutismoreefficientthanARQbecauseitdoesnotrequireretransmissionofthelostorcorrupteddatapacket. PerformanceComparisonandAnalysisofHARQinHSDPA TheperformanceofHARQinHSDPAcanbeanalyzedbasedonitslatency,throughput,anderrorrate.Latencyreferstothedelayinthetransmissionofthedatapacketfromthebasestationtotheuserequipment.Throughputreferstotheamountofdatathatcanbetransferredinagiventimeperiod.Errorratereferstotheprobabilityofanerroroccurringinthedatatransferprocess. Latency ThelatencyofHARQinHSDPAisaffectedbythenumberofretransmissionsrequiredforsuccessfultransmissionofthedatapacket.T