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1、*mw*t*ew*UE2XnAP.HandovafReQiMSf6RACH8n中7RRCfcontigurstoCornpite8.MGAPPM)S而MhW(WMMrk和老康一起学科0.XnAP:XnSetupRequest0XhAPXnS畋PRyPQng.:9NGAPPhSwitchRequestAckmMgeWXnA户UEComeXtRese:看1OG学5G(26)-网络侧下发的切换命令#5G#切换命令切换(handover)是移动通信中终端(UE)在与站点(小区)之间进行业务信息传输过程中，由于各种原因从原站点(小区)所用信道上转移到一个站点(小区)更适合信道上进行信息传输的过程。无线网
2、络中触发切换原因有两类：终端(UE)在与基站之间进行信息传输时从一个无线覆盖小区移动到另一个无线覆盖小区，由于原来所用的信道传输质量太差而需要切换。终端(UE)在与基站之间进行信息传输时处于两个无线覆盖区之中，系统为了平衡业务而需要对当前所用的信道进行切换。一、切换命令下发在5G网络中源站点(小区)根据终端(UE)上报的测量报告选定目标站点(小区)、与目标站点(小区)协议确认后通过RRC重配置(RRCReconfgiuration)消息向终端(UE)下发(见图1中4)。A0rWS.RNT0E-0CfteRNTVveMftt*0w1t2Preent0vwt3Pm4QwM4Ptwnt*0p.0.m
3、iMpch.HAAQ,ACC.Coo1：PHyk4.C4*C0n*9tOpF3MrCdrxPr*et0rccrA9urMa0nWchS）ncPrMnt1IdfJiwtAndCttAt*Pretm1Hn1nSyncOcOf1ynwF9C0nvn0nPwnt1rchC0n9Ddk4tedS4*tm1上i噬甑盘宓工.CoPtfU9202302*07-0921630F1UBCONTXTMOOrICATOWRS-111116S436.460101wndXN.V19-HANDOVIMJttQUtSY9111311563094.460002583MndUU.V1RACfUeonurMoComptete21M
4、6611111S436.4602rtvUE.CONTEXT.MOOON.RKU21尔11111565436.0919IU11湖通.46000500edF1U.CONTEXT.MOOICATKMM.RKJ-91W9113H%3094-4000564revUC.COMTJXT-MOOON.RSU.91W11311S630M.4600022rev八UtCOHTtXT.MOCWCON.IttU91S9911111563094.4600022Mnd91”oH*coo19189911311S63094.4038Mnd211”11565436/6000D91WIB115630944600023revIM22
5、-O2-O7-0WWJ417UU,V19.MewrwrtfUpxtI202302-O7-O2216S4XN.V1SNJTATUSeTRANSFER202307.Q2M727W_V19.的近I2O227-092923.734UE-COWXT-WIEASB.COMMAND9189911311%30M,460Z7wnd20239207622735F1UC.COHT（XT.Itf1（AS（.COMPt（9189IUH563094.4600022rev20239297629（23.733Ut.COHHXTRUIASCCOMMAND91W113”30943Z7rev图2.5G网络中Xn切换主要信令消息三、
6、切换命令注释给终端(UE)切换命令通过空口(Uu)的RRCReconfgiuration消息下发，消息中包含了radioBearerConfignonCritica1ExtensionPresentM条终端在该小区公共和私有控制资源和业务资源的具体配置信息。UuMsgmessaget=rrcReconfigurationrrc-TransactionIdentifier=0Critica1ExtensionsFrcRcconfiguraiionIOptFIagsFadioBearerConfigPresent=1（无线承载配置=是）secondaryCe11GroupPresent=Omeas
7、ConfigPresent=OIateNoncritica1ExtensionPresent=OnonCritica1ExtensionPresent=1（非关健扩展=是）radioBearerConfig（无线承蒙配置）IOptFIagsSrb-ToAddMod1istPresent=1（SRB新增修改列表=是）C1rb-ToAddMod1istPresent=1（DRB新增修改列表=是）drb-ToRc1easc1istPrcscnt=OSecurityConfigPresent=1（加密配置=是）Srb-ToAddMod1ist（SRB新增修改列表）n=2e1em0tOp（F1agsre
8、cstab1ishPDCPPrcsent=1（PDCP层重建=是）discardOnPDCPPrescn=Opdcp_ConAgPresent=1（PDCP配置=是）srb_Identity=1（SRBID=I）Feestab1ishPDCP=O:SRB_ToAddMod_reestab1ishPDCP_Root_truepdcp_Config（PDCP配置）IOptF1agsdrbPrcscn1=0morcThanOncR1CPrcscnt=0JReorderingPresent=1（直组=是）verExt2Present=0t-Reordering=31:PDCP_Config_t_Reo
9、rdering_Root_ms2000（PDCP配置周期2000ms）e1em1tOptF1agsFeestab1ishPDCPPresent=I（PDCP重建=是）discardOnPDCPPrescnt=0pdcp_ConfigPresent=I（PDCP配置=是）srbdentity=2（SRBID=2）Feestab1ishPDCP=0:SRB_ToAddMod_reestab1ishPDCP_Root_truedc-ConfigIOptFIagsdrbPrcsen1=0CReordcringPresent=1verExt2Prescnt=0t_Reordering=31:PDCP_C
10、onfig_t_Reordering_Root_ms2000（PDCP配置周期2000ns）drb_ToAddMod1ist（DRB新增修改列表）n=1e1emOIOptF1agsCnAssociationPresent=1（CN支持=是）rcestab1ishPDCPPresent=OFecoverPDCPPresent=Opdcp_ConfigPresent=I（PDCP配置=是）cnAssociation（PDCP配置）t=sda-Config（SDAP配置）usdap_ConfigIOp1FIagsmappedQoS-F1owsToAddPresent=1（QOS流与地址映射）mapp
11、edQoS_F1owsToRe1easePresent=OPdU_Session=6（PDU会话=6）sdap.HeadcrD1=1:SDAP_Config_sdap_HcaderD1_Root_abscnt（下行SDAP头-缺省）sdap-HcadcrU1=O:SDAP_Config_sdap_HeadcrU1_Root_prcsent（上行SDAP头-显示）defau1tDRB=TRUE（缺省DRB=是）mappedQoS_F1owsToAdd（Qos流映射）n=1e1emOJ=1drb-Identity=1（DRBID=I）pdcp-Config（pdcp配置）IOptFIagsdrbP
12、rescnt=1morcThanOncR1CPrcscnt=OverEx12Present=OdrbtOptFiagsCiiscardTimerPresent=1pdcp_SN_SizeU1Present=1pdcp_SN_SizeD1Present=1discardTimer=14:PDCP_Config_drb_discardTimer_Root_ms1500pdcp_SN_SizeU1=1:PDCP_Config_drb_pdcp_SN_SizeU1_Root_1cn18bitspdcp_SN_SizeD1=I:PDCP_Config_drb_pdcp_SN_SizcD1_Root_1cn18bitsSerVedRadiOBearer（保留的无线承载）t=srb_Identity（SRBID）usrb-Identity=1HjConfig（R1C层配置）t=am传输模式=AM）U1AM_R1C（上行R1CAM）tOptFiagssn-Fie1d1engthPresent=1（sn长度配=是）s
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