NB-IoT技术--RAN2-3流程简介

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Title:Type:微软雅黑Size:32-24-ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:20ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B245NB-IoT技术交流--RAN2/3流程简介Title:Type:微软雅黑Size:24-ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:20ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B245RAN2/3相关流程•随机接入流程•上行功控–随机接入功控–NPUSCH功控•上下行HARQ•TA更新流程•Suspend/Resume流程•DRX和eDRX•系统消息发送和更新流程•PSM©ZTEAllrightsreservedTitle:Type:微软雅黑Size:24-32ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:18ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B2453内部公开▲随机接入流程(LegacyLTE对比分析)随机接入触发场景NB-IoTLegacyLTE(R8)CPsolutionUPsolution在RRC_IDLE状态下初始接入YYYRRC重建NYY上行数据到达(上行失步或者调度请求)YYY下行数据到达(上行失步)YYY切换NNY定位NNYNB-IoTLegacyLTE(R8)基于竞争(Contentionbased)基于竞争基于非竞争Non-Contentionbased随机接入类型©ZTEAllrightsreservedTitle:Type:微软雅黑Size:24-32ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:18ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B2454内部公开▲随机接入Preamble资源(LegacyLTE对比分析)•LTE/NB-IoT从系统消息SIB2中,确定PRACH信道配置和资源•NB-IoTRSRP-ThresholdsPrachInfoList确定CEL等级,选择对应CEL的PRACH资源•CE等级从0递增,numRepetitionsPerPreambleAttempt递增•maxNumPreambleAttemptCE©ZTEAllrightsreservedTitle:Type:微软雅黑Size:24-32ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:18ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B2455内部公开▲随机接入Preamble资源(LegacyLTE对比分析)NB-IoT时频域资源LTE时频域和Preamble资源©ZTEAllrightsreservedTitle:Type:微软雅黑Size:24-32ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:18ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B2456内部公开▲随机接入响应窗口(LegacyLTE对比分析)NB-IoT随机接入响应窗口单位是PDCCH周期窗口起始位置和长度未定,上图只作为示例说明©ZTEAllrightsreservedTitle:Type:微软雅黑Size:24-32ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:18ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B2457内部公开▲随机接入响应LTE--RA-RNTI=1+t_id+10*f_idNB-IoT的RA-RNTI计算方法待确定©ZTEAllrightsreservedTitle:Type:微软雅黑Size:24-32ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:18ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B2458内部公开▲MACPDU(RandomAccessResponse)MACPDU(RAR)--NB-IoT和LTE结构定义一样NB-IoTBI机制待确定RAPID部分包含NPRACH频域Tone信息,待确定©ZTEAllrightsreservedTitle:Type:微软雅黑Size:24-32ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:18ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B2459内部公开▲RandomAccessResponseRAR格式--NB-IoT和LTE一样©ZTEAllrightsreservedTitle:Type:微软雅黑Size:24-32ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:18ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B24510内部公开▲ULGrantinRAR字段取值范围ULSubcarrierSpacing0-3.75k,1—15kSubcarrierindication6bits(和DCIN0中的ULGrant一致)MCS/TBS3bits(特殊的MCS和TBS表)Schedulingdelay2bits(和DCIN0中的Delay一致)MSG3RepetitionNumber3bits(和DCIN0中的Repetition一致)Totalnumberofbits15bits(+5bitspadding)©ZTEAllrightsreservedTitle:Type:微软雅黑Size:24-32ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:18ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B24511内部公开▲发送MSG3消息•UE使用MSG2中分配的ULGrant资源•UE发送MSG3•UE启动冲突检测定时器mac-ContentionResolutionTimer©ZTEAllrightsreservedTitle:Type:微软雅黑Size:24-32ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:18ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B24512内部公开▲DV和PHRPHDVOct1RRIndexDataVolume(DV)value[bytes]IndexDataVolume(DV)value[bytes]0DV=0867DV=9110DV=10991DV=125210DV=1410125DV=171314DV=1911171DV=234419DV=2612234DV=321526DV=3613321DV=440636DV=4914440DV=603749DV=6715DV603MACCE格式DV定义PH定义未最终确定©ZTEAllrightsreservedTitle:Type:微软雅黑Size:24-32ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:18ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B24513内部公开▲MSG4和MSG5©ZTEAllrightsreservedTitle:Type:微软雅黑Size:24-32ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:18ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B24514内部公开▲PDCCHOrderDCIformatN1:-FlagforformatN0/formatN1-NPDCCHorderindicator–1bit-NPDCCHOrder标志置为1时,使用C-RNTI加扰-StartingnumberofNPRACHrepetitions–2bits(覆盖等级)-其它所有bit都置为1©ZTEAllrightsreservedTitle:Type:微软雅黑Size:24-32ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:18ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B24515内部公开▲随机接入功控MSG1preamble发送功率的确定•CEL等级数量1,最低CEL采用powerramping方案发送•其它CEL用最大功率发送•CEL等级数量=1,powerramping发送。preambleInitialReceivedTargetPower{-90dBm----120dBm}powerRampingStep{0dB,2dB,4dB,6dB}PathLoss=RS功率–RSRPUE侧计算Preamble发射功率LTE:PREAMBLE_RECEIVED_TARGET_POWER=preambleInitialReceivedTargetPower+DELTA_PREAMBLE+(PREAMBLE_TRANSMISSION_COUNTER–1)*powerRampingStep©ZTEAllrightsreservedTitle:Type:微软雅黑Size:24-32ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:18ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B24516内部公开▲随机接入功控NB-IoT:PREAMBLE_RECEIVED_TARGET_POWER要考虑重复次数的因素PREAMBLE_RECEIVED_TARGET_POWERissetto:PREAMBLE_RECEIVED_TARGET_POWER-10*log10(numRepetitionPerPreambleAttempt)物理层发送Preamble功率=min(Pmax,PREAMBLE_RECEIVED_TARGET_POWER+Pathloss)示例:RS功率20dBm,RSRP=-70dBm,PL=90dB小区配置三个覆盖等级,normal,extend,extreme在normal等级下,preambleInitialReceivedTargetPower=-110dBmRepetition=2Preamble第一次attemp发射功率=-110-3+90=-23dBmPreamble第二次attemp发射功率=-23+powerRampingStepdBm©ZTEAllrightsreservedTitle:Type:微软雅黑Size:24-32ptColor:TheZTEblueSubtitle:Type:微软雅黑Size:18ptColor:TheZTEgreenG143,B212R140,G198,B62R90,G203,B24517内部公开▲Preamble重发(Retransmission)UE在窗口内没有收到RAR消息,或者RAR消息中的RAPID不对。•第一次Attempt失败,准备重发:•PREAMBLE_TRANSMISSION_COUNTER_CE加1,判断是否超过当前CEL下

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