看LOG学5G(22)--DU和CU拆分场景下终端接入信令注释.docx

看1OG学5G(22)-DU和CU拆分场景下终端接入信令注释#5G#RAN#DU#CU#RACH在5G站点gNB拆分成CU和DU后，无线网络中就增加了接口F1；当终端接入网络时DU首先接收到空口的消息，再经过F1接口发送给CU；而在下行数据到达时，则CU先进行处理，然后通过F1接口传送至DU,之后再通过空口传递给终端(UE);一、初始无线接入流程初次接入5G网络的终端(UE)在完成与基站的下行和上行同步、允许准入后向网络发起RRC建立请求，DU将”Initia1U1RRCMessageTnmSfer”消息传递给CU;CU通过"D1RRCMessageTranSfer”消息为终端分配无线资源(建立)。图1.5G终端初始接入流程(消息)二、初始无线接入实例初始无线接入的终端(UE),在空口(Uu)和F1接口进行RRC及初始上行RRC消息传递。IdTimeData1dMsg1dUe1dCe111dDirectionRNT11ength02023-02-07-09:10:55.771UU.V190630RRCSetupRequest98956113rev2884612023-02-07-09:10:55.771F1INrnA1U1RRjMESSAGEjRANSFER98956113send288410722023-02-07-09:10:55.771F1INmA1_U1RRJMESSAGEJRANSFER98956113rev288410732023-02-07-09:10:55.772UU_V190630RRCSetup98956W才幡康巴崽早先42023-02-07-09:10:5511UU_V190630RRCSetupComp1ete98956113rev288485图2.5G终端初始接入消息三、5G终端初始接入消息注释5G终端（UE）初始接入消息中成述了RRC建立的原因、终端（UE）在网络单元的指示分配、无线资源；在回复的RRcsetupCompIete消息中包含了终端向核心网注册、认证等内容；主要消息注释如下：3.1.RRCSetupRequest这是初始接入中收到网络侧允许其接入的RAR消息之后，终端通过空口（UU）向网络申请的RRC连接请求。UuMsg（空口消息）messagedt=FrcSetupRequest（RRC建立请求）UeJdentity（UE标识）t=randomVa1ue（终端随机接入值）urandomVa1uenumbits=39（随机接入BIT=39）data=000101101000001101010010111001100001110（BIT）这是小区随机接入码64个其中一个estab1ishmentcause=3:Estab1ishmentCause_Root_mo_Signa11ing-RRC请求建议原因：主叫信令spare（备用）numbits=1（1位bit）data=O（BIT）3.2.Initia1_U1_RRC_Message_TransferDU接收到终端的RRCSetupRequest消息后通过F1接口向CU传递的终端RRC建立请求消息，其中除规范消息外，还包括厂家F1接口的私有消息。FIapMsgt=SnitiatingMessage（初始消息）uInitiatingMessageProcedureCode=P1nitiaIU1RRCMessageTransfer（初始上行RRC消息传送）Union_va1ueP1nitiaIU1RRCMessageTransferprotoco1IEstOptF1ags（消息选项标识d11toCURRCContainerPresent=1（DU-CURRC消息二是）Su1AccessIndicationPresent=0（SU1信息=无）UdtTraceInformationPresent=0（UDT消息=无）PrivateInfoContainerPresent=1（私有消息=有）gNB_DU_UE_F1APJD=2483（DU中UE的F1AP标识:2483）nRCGI（5G小区CG1）tOptF1agsiE_ExtensionsPresent=0p1MNJdentity（P1MN标识）nocts=3data=64fOO（HEX）（P1MN=46000）nRCe111dentitynumbits=36（小区标识36bits）data=10110000011100000101011000000111OOOI（BIT）小区标识（二进制）c_RNTI=2884（终端在小区标识二2884,竞争解决后网络分配）rRCContainernocts=6（RRC容器=6位）data=1168352e61c6（HEX）-RRC内容messaget=dudt=rrcSetupRequest（RRC建立请求）uejdentity（UE标识）t=randomVa1uerandomVa1ue终端随机接入值）numbits=39data=000101101000001101010010111001100001110（BIT）estab1ishmentcause=3:Estab1ishmentCause_Root_mo_Signa11ingspare（RRC建立原因二主叫接入）numbits=1data=O（BIT）dtoCRRCContainer（DU->CURRC容器）nocts=44data=5400b01104234809061ee007c21c550799400804008188a200008034dd0680301e08400027ff49cee739CO（HEX）-RRC容器内容tOptF1agsr1c_BearerToAddMod1istPresent=1（R1C承载建立=是）r1c_BearerToRe1ease1istPresent=0mac_Ce1IGroupConfigPresent=1（MAC承载建立=是）Physicaice11GroupConfigPresent=0spCe11ConfigPresent=1（spCe11配置=是）Sce1IToAddMod1istPresent=0Sce11ToReIease1istPresent=0verExt2Present=0CeIIGroupId=0HjBearerToAddMod1iSt（R1C承载添加修改列表）n=1e1em0tOptF1agsServedRadioBearerPresent=1（默认承载=是）reestab1ishR1CPresent=0r1c_ConfigPresent=1（R1C配置二是）mac.1ogica1Channe1ConfigPresent=1（MAC逻辑信道配置二是）IogicaIChanneIIdentity=1（逻辑信道标识二是）ServedRadioBearer（默认承载）t=SrbJdentity（SRBID）uSrbJdentity=1（SRBID=1）r1c_Config（R1C配置）t=am（传输模式=AM）uamu1_AM_R1C（±ij_AM_R1C酉已置）tOptF1agsSneFieId1engthPresent=1（SN长度标识二是）sn_Fie1d1ength=O:SN_Fie1d1engthAM_Root_size12（SN长度=12bits）t_Po11Retransmit=8:T_Po11Retransmit_Root_ms45（令牌桶周期=45ms）po11PD=4:Po11PDU_Root_p64（令牌桶PD=p64）po11Byte=8:POI1Byte_ROOjkB75（令牌桶Byte=kB75）ma×Ret×Thresho1d=6:U1_AM_R1C_maxRetxThresho1d_Root_t16（U1_AM_R1C最大重发门限=6,时长=t16）d1_AM_R1C（下行_AM_R1C配置）tOptF1agssn_Fie1d1engthPresent=1（SN长度二是）sn_Fie1d1ength=O:SN_Fie1d1engthAM_Root_size12（SN长度=12bits）t_Reassemb1y=8:T_Reassemb1y_Root_ms40（重组=8,时长=ms40）CStatusProhibit=2:T_StatusProhibiJRoojmS1O（间歇=2,时长=ms10）mac_1ogica1Channe1Config（MAC层逻辑信道配置二是）tOptF1agsU1specificParametersPresent=1（上行特定参数二是）U1SpecificParameters（上行特定参数）tOptF1agsOOOIogicaichanneIGroupPresent=1（逻辑信道=是）ScheduIingRequestIDPresent=1（调度请求ID二是）bitRateQueryProhibitTimerPresent=Opriority=1（优先级=1）PrioritisedBitRate=I5:（上行信道数据速率=infinity（不限制）1ogicaIChanne1Config_u1_SpecificParameters_prioritisedBitRate_Root_infinitybucketSizeDuration=7:（令牌桶周期=7）1ogica1Channe1Config_u1_SpecificParameters_bucketSizeDuration_Root_ms500（令牌桶时长:50OmS）IogicaIChanneISR-Mask=FA1SEIogicaichanneISR-DeIayTimerAppIied=FA1SEmac_Ce11GroupConfig（MAC小区组配置）tOptF1agsdrx_ConfigPresent=0Schedu1ingRequestConfigPresent=1（调度请求配置二是）bsr_ConfigPresent=I（BSR配置二是）tag_ConfigPresent=1（标识配置二是）phr_ConfigPresent=1（PHR配置二是）verE×t2Present=0ScheduIingRequestConfig（调度请求配置）tOptF1agsSchedu1ingRequestToAddMod1istPresent=1（调度请求配置二是）Schedu1ingRequestToReIease1istPresent=0Schec1u1ingRequestToAdcIMod1ist（调度请求配置增加修改）n=1（第1个）e1em0tOptF1agssr_ProhibitTimerPresent=1（SR间歇计时器;是）ScheduIingRequestId=0sr_ProhibitTimer=3:ScheduIingRequestToAddMod_sr_ProhibitTimer_Root_ms8（SR间歇计时器=3,间歇时长=8ms）sr-TransMa×=4:Schedu1ingRequestToAddMod_sr_TransMax_Root_n64（