双端口单通道室分重选切换问题优化

双端口单通道室分重选和切换问题优化一、问题描述网优人员在对“嘉兴礼顿酒店”进行现场测试验证时,发现终端无法正常从室外的1825频点重选或切换到室内的100频点。礼顿酒店1825-89嘉兴城西局：1825-126嘉兴江南摩尔-1100-329嘉兴江南摩尔东区6F从问题现象看，终端从室外到室内的过渡的过程中，室外1825频点信号逐渐衰落到-110以下，终端却始终没有搜索到室内100频点的相关信息。15:14:57,068皆MeasurementReportUL_DCCHIS：15：02187令MeasuremenlReportUL_DCCH18:15:05一464♦MeasurementReportUL_DCCH16:15:07312$PagingPCCH16:15:08,8600UeasuremenlReportUL_DCCH16:15:08,896*RRCConnectionReconfigurationDL_DCCH =16115：08.S99/RRCConnectionReconfigurationCompleteUL_DCCH16:15:23,959•PagingPCCH16:15:31467令MeasiirementReportUL_DGCH16:1531.471*RRCConmectionReconfigurationOL_DCCH16:15:31475RRCConnectionReconfigurslionCompieteUL_DCCH 「NameDistanceEARFCNPCIRSRPRSRQ 二瞰Q：■：Typer»meMessages对于空闲态，室外1825频点的重选频率优先级为3而室内100频点的重彳:选频率优先级为白“白“SystemlnformationBlockTypeSB-cellReselectionlnfoCommonLq-Hyst:(4)dB4□■cellReselectionServingFreqlnfioHs-NonlntraSeardi:10.thrushSurvingLoM3tellReselecti口nPriority:M[intraFreqCellReselectionlnfioHq-R.xLevMin:-64Hs-IntraSeardi:29HpresenceAntennaPortl:falseHneighCellConfig:0x1pt-ReselectionEUTRA:10■■t-ReselectionEUTRA-SFHsf-Medium:(3)iDotlDL-sf-High:(2)oDot754,终端对于室内100频点始终进行测量。SystemlnformationBlockType5

B-interFreqCarrierFreqListS-InterFreqCarrierFreqlnfiodKarrierFreq:100p-q-RxLevMin:-64p-t-ReselectionEUTRA:1h-threshX-High:11p-threshX-Low:11h-allowedMeasBandwidth:(5)mbw100p-presenceAntennaPortl:falsep|cellReselectionPriority:4p-neighCellConfig:0x1Lq-OffcetFreq:(15)dBO对于业务态，室外1825频点服务小区衰减到A2门限以下，重配置消息也已触发了对于100频点的异频测量。

El-rrcConnectionReconfiguration-r8B-measConfigdmeasObjecfToAddModListMeasObjectToAddModh-measObjectld:2白“measObjectB-measObjeciEUTRA:(5)mbwlOOP|carrierFreq!100h-allowedMeasBandwiih-:(5)mbwlOOH-neighCellConfig:0x1=-offeetFreq:(16)dB1Te舄」」+但终端并没有检测到100频点相关的测试信息，也没有上报室内100频点的相关测量报告。分析存在两种可能的原因：1)室分RRU或分布系统存在故障，导致礼顿酒店内并没有100频点小区的功率发射；重选或切换相关测量参数存在错误。二、问题分析通过网管查询及现场确认RRU无告警，驻波比处于正常范围。终端重启后正常占用100频点的室分信号，且RSRP覆盖良好，判断设备及分布系统运行正常。注:终端开机通过均进行检测。PBCH盲检测获取小区的天线端口数为注:终端开机通过均进行检测。PBCH盲检测获取小区的天线端口数为：2：从而可对本例中的Port0和Port116:59:22,558令ActivateDefaultEPSBearerContextAcceptEPSSM16:59:22,559。AttachCompleteEPSMM16:59:22,560♦RRCConnectionReconfigurationCompleteUL_DCCH16:59:22,569lULInformationTransferUL_DCCH16:59:22,570・RRCConnectionReconfiguration□L_DCCH16:59:22,572个RRCConnectionReconfigurationCompleteUL_DCCH16:59:22,573，DLInformationTransfer□L_DCCH16:59:22,575*EMMInformationEPSMM16:59:23,386・MeasurementReportUL_DCCH17:00:02,772■RRCConnectionReleaseDL_DCCH17:00:03,247■Master!nformationBiockBCCH_BCHTable5.3.1.1-1:CRCmaskforPBCH.NumberoftransmitantennaportsateNodeBPBCHCRCmask< 5>1<0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0>2<1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1>4<0,1,0,1,0,1,0,1,0,1,0,1,0,1,0,1>基于以上分析，可以排除相关硬件类故障，因此重点分析参数配置可能存在的问题。在本室分实施方案中，采用了非常规的建设方案，即RRU的两个端口分别覆盖不同的目标区域以提升功率利用率，节约成本。其中物理端口ANT1覆盖江南摩尔东区的苏宁电器及其他区域，物理端口ANT4覆盖礼顿酒店，即本次测试区域。

ANT4覆盖礼顿酒店覆盖苏宁电器及其他ANTI后台配置MIMOANT4覆盖礼顿酒店覆盖苏宁电器及其他ANTI后台配置MIMO为自适应模式，即终端在每个物理端口覆盖的区域实际使用的为单流TM2。华为双端口RRU默认的物理端口与逻辑端口的映射关系为：ANT4Portl物理端口 ANTIANT4Portl映射关系［逻辑端口 Porto物理端口AN1映射为逻辑端口PORT0，物理端口AN4映射为逻辑端口PORT1。逻辑端口由RS定义，即逻辑端口PORT0只发射RS0，而逻辑端口PORT1只发射RS1。嘉兴礼顿酒店由RRU的物理端口ANT4覆盖，因此终端在此区域只能收到RS1的信号，而检测不到RS0。Thereference-signaJ!sequence(祖)isdefinedby^1. )外(制)=](1—3c(2m))+ +1))=陋=0L…2W睁DL_iawhereistheslotnumberwithinaradioframeand工；s[lie口FpMsymbolnumberwithinrRtJliepseudorandomsequence仪。isdefinedinSection7.2.Tliepseudo-randomsequencegeneratorshallbeinitialisedwith匚而【=?0-(7-(/+ + -A塔।+1[+2-A塔।+Wcp理thestartofeachOFDMsymbolwhere+1Y1fornormalCP' 0forextendedCP根据协议36.211,小区专用参考信号由一定的序列生成，在生成的公式中通过l变量和子载波位置区分RS0和RS1。根据协议36.214描述，UE在测量邻区的RSRP时，主要是测量0号天线上的RS参考信号。如果UE能感知到1号天线的话，它会取两路信号的算术平均。（UE尝试感知天线数目对于服务小区和邻区时候是不一样的。在服务小区的时候，UE会检测PBCH获取小区的天线数目，而对于邻小区，UE不会读取邻区的广播消息。）终端始终测量邻区的RS0，而RS1是否测量则通过高层配置决定。

在idle态的时候UE通过服务小区的SIB消息中PresenceAntennaPortl获取邻区天线配置信息，在连接态的时候UE通过服务小区测量控制消息中PresenceAntennaPortl获取邻区天线配置信息。B-SystemlnfbrmationBlockTypeB-SystemlnfbrmationBlockType5

interFreqCarrierFreqList

B-InterFreqCarrierFreqlnfb

kdl-CarrierFreq:100

rq-RxLevMin:-64

t-ReselectionEUTRA:1.

threshX-High:11IthreshX-Low:11p-allowedF'leasBandwidth:(5)mbw100JPresenceAntennaPortl:false|cellReselectionPriority:4rneighCellConfig:0x1Lq-OffeetFreq:(15)dBOEl-rrcConnectionReconfiguration-r8B-measConfigE)-measObjeciToAddModList\□MeasObjecfToAddModmudssObju匚tld:2measObject0-measObjectEUTRAp-carrierFreq:100j-allowedMeasBandwidth:[5)mbw100|-PresenceAntennaPortl:false[neighCellContig:Uxl^-offisetFreq:(16)dBl分析测试log，室外小区“嘉兴城西局-49（1825-89）”的sib5和重配置消息中均把邻区的Portl配置为false。终端根据高层配置，在邻区测量的过程中，只测量邻区的port。，而不会测量分析测试log，室外小区“嘉兴城西局-49（1825-89）”的sib5和重配置消息中均把邻区的Portl配置为false。终端根据高层配置，在邻区测量的过程中，只测量邻区的port。，而不会测量portl。因此，终端在只有Portl覆盖的室内区域，即使启动了异频测量，也无法测量到PortO的相关信息，造成无法切换或重选的问题。查询现网相关配置参数如苴LF_H星兴城西局BBU003苴LF_H医兴城西局BBUQQ4苴LFJH*城西局日BU005苴LFJH遂兴城西局BBU006苴LF_H医兴城西局BBUQQ7A,LF_H*城西局日BU008LF_H黄兴城西局BBU009苴LF_H*城西局BBU010苴LF_H_M是城西局BBU011苴LF_H医兴城西局BBU012比LF_H争兴城西局BBU013iS圜|悉，2曲曰]:馆团圜，有 下口|城西局 |四口口LTETS3900V100R010C10SPC180目嘉兴LTE子网□@TDD回④嘉兴-0芯Ilf_h选兴城西局一口由LF_H星兴城西局BEU呈兴亚扇风和苑L口比LF_H最兴城西局BBU最兴海派秀城口④室分SFM小区物理小区数里对空覆盖小区标识小区级参考信号端口颊小区域送和接收模式小区参考信号天线端口映射网皿否1个CRS端口一发一收NULL网皿否1个CRS端口一发一收NULLlfi.ru.舌1个CRS端口_发_收NULLlfi.ru.香 L2个匚RS端口两发两收NULLld.ru.否1个CRS端口_发_收NULL*压缩:压缩:压缩:压缩:压缩:压缩不酉遗不酉情室内覆盖的小区物理天线配置为“两发两收”，小区参考信号端口配置为“2个CRS端口”周边的宏站的异频邻区双发射天线配置指示默认配置为“否”。通过以上分析，现网的参数配置，并不适用于案例中的组网方式。经过原理分析与效果验证，对于这一类问题，目前主要有2种解决方案：三、解决方案11）调整措施♦修改周边同频邻区“同频邻区双天线配置指示CellResel.PresenceAntennaPortl”为BOOLEAN_TRUE。♦修改周边异频小区“异频邻区双天线配置指示EutranlnternFreq.PresenceAntennaPortl”为BOOLEAN_TRUE。本案例中,由于室内一100频点小区只与室外1825频点相邻，因此只修改“异频邻区双天线配置指示EutranInternFreq.PresenceAntennaPortl”为TRUE即可。2)效果验证SystemlnfarmationBlockTypeSintfirFreqCarrierFreqList2)效果验证SystemlnfarmationBlockTypeSintfirFreqCarrierFreqList0-InterFreqCarrierFreqlnfbhdl-CarrierFreq:100pq-RxLeyMin:-64b-t-ReselectionEUTRA:1threshX-High:11threshX-Lom:11mil0附mdMEmsBmndwidtii:(出mbwtDO卜•prescn匚」力ntennsPcirtl:truer-cellReselectionPriority:4hneighCellConfig:Owlq-OffisetFreq:(15)dBOrrcConnectionReconfiguration-r80-measConfig0-measObjectToAddModListfi-MeasObjectToAddMod-measObjectld:2measObject□■measObjectEUTRApcarrierFreq:100：二目金它dMe-sB-ndwidth:(5)mbuv100presenceAntennaPortl:truePneighCellContig:0x1L-offcetFreq:(16)dBl13:40:44.650RandomaccesssuccessSIB513:40:44.651Prach:Msg2(RAR)13:40:54.193EventA213:40:54.19813:41:12.31113:41:12.351HandoverstartTargetCell:1825-8913:41:12.357measCfgEventA313:40:44.734measCfg13:40:44.684Handoverlate「nevinfo13:15:52.2464Syslnfo13:15:52.246。SIBType213:15:52.246。SIBType3BCCH-SCHBCHBCH13:15:52.246*SyslnfoBCCH_SCH13:15:52.256•S/B7ype5BCH13:15:52.256MasterinformationBlockBCCH_BCH13:40:44.650RandomaccesssuccessSIB513:40:44.651Prach:Msg2(RAR)13:40:54.193EventA213:40:54.19813:41:12.31113:41:12.351HandoverstartTargetCell:1825-8913:41:12.357measCfgEventA313:40:44.734measCfg13:40:44.684Handoverlate「nevinfo13:15:52.2464Syslnfo13:15:52.246。SIBType213:15:52.246。SIBType3BCCH-SCHBCHBCH13:15:52.246*SyslnfoBCCH_SCH13:15:52.256•S/B7ype5BCH13:15:52.256MasterinformationBlockBCCH_BCH13:15:52.256,RRCConnectionReconfigurationDL.DCCH13:15:52.256,RRCConnectionReconfigurationCompleteUL.DCCH-inu-urc-zua"QExtraEvents“ture”13:15:52.19613:15:52.22613:15:52.22613:15:52.22613:15:52.236Cell:100-329HandoverHandoverstartPrach:Msg1(RA)RandomaccesssuccessPrach:Msg2(RAR)Prach:Msg3(UEID)13:41:12.360Prach:Msg1(RA)Randomaccesssuccess13:41:12.36213:41:12.39013:41:12.391.13:41:12.495Prach:Msg2(RAR)HandoverlaterncyinfoHandoversuccess100-329->1825-8913:15:52.236vHandoversuccess1825-89->100-329NameDistanceEARFCNPCIRSRP100329I-99-0100329［驷measCfg+2,3,45-1,6,7,8RSRQ-6-11.013:15:52.27613:15:52.966measCfgEventAI*7,8,9,10-1,2,3,4,5,6-02NameDistanceEARFCNPCIRSRPRSRQ100329.59 -78|1825107116-181825117a-191825281a-191825284|118-18Sib1Sib313:15:52.236 ReadSystenInfo13:15:52.246 ReadSystenInfo成功重选 成功切换修改配置后，终端成功由室外1825频点重选（切换）到室内100频点。相关建议为避免类似本案例中不能重选或切换的情况，降低负面影响，建议按如下场景区分配置：当邻区全部为1T1R小区时，建议将本小区的CellResel.PresenceAntennaPortl,

EutranInternFreq.PresenceAntennaPortl配置为BOOLEAN_FALSE。参数如果配置为BOOLEAN_TRUE,测试两个天线端口RS信号会做算术平均，在本情况下，参数为True的天线增益会比参数为Flase的增益小3dB，导致重选和切换稍晚一些触发；当邻区不全为1T1R小区时,建议将本小区的CellResel.PresenceAntennaPort1,EutranInternFreq.PresenceAntennaPort1配置为BOOLEAN_TRUE，但是这种设置会导致邻区中单通道覆盖小区的增益较小，同样会对重选和切换的触发时机有一定影响。四、解决方案2主要通过修改问题小区的物理端口和逻辑端口的映射关系，从而实现室外往室内的正常重选和切换。1）调整措施参勃名称所属网元斯国命令含义修改本小区“CELL.CrsPortNum”即“小区参考信号端口数”为“1个参勃名称所属网元斯国命令含义霎信号端口数BTS3900,BTS3900LTEADDCELLHODCELLLSTCELL该参数表示小区参考信号端口数。根据协议约束，小区参考信号端口额支持1、2、4三种配置：取值为1表示配置CRS端口数为1，即逻辑天线Port。；取值为2表示配置CRS端口数为2,即逻辑天线PortU/1；取值为4表示配走CRS端口数为4，即逻辑天线PortO/1/2/3。修改该参数后，RRU的物理端口和逻辑Port的映射关系发生变化，物理端口0和物理端口1分别映射到逻辑Port。。物理端口PortOANT4映射关系xnn-FO物理端口PortOANT4映射关系xnn-FO三皿I-h逻辑晒口这样，RRU所有覆盖区域均有RS0覆盖，而终端在重选和切换的过程中默认总是对邻区的RS0进行测量，从而可以顺利进行过渡。2）效果验证13:16:45,3884SysInfoTypel13:16:45.404SMasterlnformationBlock13:16:46.7614PagingBCCH_SCHBCCH_BCHPCCH13:16:46.854tServiceRequestEPSMM13:16:46.854,RRCConnectionRequestUL_CCCH13:16:46.901|RRCConneMonSetup|dl_ccchTimeEvents13:16:40,474[^RRCrelease13:16:40.552RRCTimerFiredCONNRei13:16:43.750ReadSystenInfo(13:16:43.750ICellreselect13:16:45,3884SysInfoTypel13:16:45.404SMasterlnformationBlock13:16:46.7614PagingBCCH_SCHBCCH_BCHPCCH13:16:46.854tServiceRequestEPSMM13:16:46.854,RRCConnectionRequestUL_CCCH13:16:46.901|RRCConneMonSetup|dl_ccchTimeEvents13:16:40,474[^RRCrelease13:16:40.552RRCTimerFiredCONNRei13:16:43.750ReadSystenInfo(13:16:43.750ICellreselect13:16:43.750 ReadSystenInfo13:16:43.750 ReadSystenInfo13:16:43.766ICellreselectTargetCell:100-329Sib3-Sib513:16:45.38813:16:46.761ReadSystenInfoPagingreceivedITarge