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1、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
2、)。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_U1RRJMESSAGEJ
3、RANSFER98956113rev288410732023-02-07-09:10:55.772UU_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
4、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
5、(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_va1ueP1nitiaIU1RRCMessageTransferprotoco1IEstOptF
6、1ags(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=460
7、00)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=0001011010000
8、01101010010111001100001110(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_BearerToAddMod1istP
9、resent=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=1e1em0tOptF1agsServedRadioBe
10、arerPresent=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)tOptF1agsSneFieId1engthPre
11、sent=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)maRetThresho1d=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_
12、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)
13、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_infinitybucketSizeDurat
14、ion=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_Co
15、nfigPresent=1(标识配置二是)phr_ConfigPresent=1(PHR配置二是)verEt2Present=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(