LTE-TDD随机接入过程(3)-RAR(MSG2)以及MSG1的重传 图文.docx

LTE-TDD随机接入过程(3)-RAR(MSG2)以及MSG1的重传_图文.docx木文涉及到的内容有:UE在什么时候开始接收RAR怎么确定RA-RNTIUE没有收到RAR后的处理RAR的格式UE监测RAR文章紅TE-TDD随机接入过程(2)•前导码Preamble的格式与时频位趕》已经详细说明了UE发送Preamble询导码的时频位置。'"iUE发出Preamble后,并不是立即准备接收RAR(essResponse),而是在发送前导码之后的第3个子帧之后才开始准备接收RAR。当然,UE也不可能一直等待RAR,如果UE连续检测了ra-ResponseWindowSize个子帧仍然没冇收到RAR,则不再继续监测RAR信息。essResponse(s)identifiedbytheRA-RNTIdefinedbelow,intheRAResponsewindowwhichstartsatthesubframethatcontainstheendofthepreambletransmissionplusthreesubframesandhaslengthra--ResponseWindowSize参数山SIB2中的RACH-monT段带给UE,范帀是2-10个了帧,即UE最多连续监测RAR的时长是10ms。pV^CH-mon::SB3UENCE{preamDieinrontnuberOfRA-PreamblpspreamblesGroupACon!figsizeOfRA-Prean^lesGroupAmessageSizeGro^ipAmessagePowerOfifsetGroupBSEQUENCE{ENUMERATED{n4fnB,n!2,nl6rn20rn24rn28,n32/n36/n40rn44/n48rn52/n56rn60zn64}rSEQUENCE{ENUMERATED{n4,n8znl2,nl6,n20,n24zn28,n32,n36,n40rn44rn48rn60}rn52,n56rOPTIONALENUMERATED{b56,bl44rb208rENUMERATED{minusinfinity/dBOfdB5#dB15#dB18}#b256}rdB8/dB10rdB12#NeedOP}powerRampingParameters;powerRampingStep・preamblelnitialRec^ivedTargetPowerENUMERATED{SEQUENCE{ENUMERATED{dB0/dB2rdB4,dB6}rdBm-120rdBm-118rdBm-116rdBm-114rdBm-112,: dBm-110rdBm-108rdBm-106rdBm-104zdBm-102rdBm—100rdBm—98,dBm—96rdBm—94r: dBm-92rdBm-90}SEOUENCEfsion工n£o▼preambleTransMaxENUMERATED{n3,n4,n5,n6rnl,n8rnl0zn20,n50rnl00,n200}.ra-ResponseWindowSizeENUMERATED{sf2zsf3rsf4rsf5#sf6rsf7rsf8#sfl0]fmac-ContentionResolutionTimerENUMERATED{sf8