1、Title:Type:ArialSize:32-24-ptColor:The ZTE blue Subtitle:Type:ArialSize:20ptColor:The ZTE greenG143,B212R140,G198,B62R90,G203,B245小区重选及覆盖优化NB-IOT 网网优专题Title:Type:ArialSize:24ptColor:The ZTE blue Subtitle:Type:ArialSize:16-20ptColor:The ZTE greenG143,B212R140,G198,B62R90,G203,B245NB-IoT小区移动性特点NB-IoT小
2、区重选流程UE重选测量启动准则候选小区选择S准则小区重选R准则覆盖优化流程覆盖常见问题和分析方法外场测试重选参数建议设置值目录Title:Type:ArialSize:22-24ptColor:The ZTE blue Subtitle:Type:ArialSize:14-18ptColor:The ZTE greenG143,B212R140,G198,B62R90,G203,B245 ZTE All rights reserved3内部公开NB-IoT小区移动性特点3GPP R13协议,支持1.空闲态同频、异频小区重选2.重定向不支持1.空闲态异系统重选2.连接态切换Title:Type:
3、ArialSize:22-24ptColor:The ZTE blue Subtitle:Type:ArialSize:14-18ptColor:The ZTE greenG143,B212R140,G198,B62R90,G203,B245 ZTE All rights reserved4内部公开NB-IoT小区重选流程开始开始服服务小区启小区启动重重选测量量目目标小区小区满足足S准准则候候选小区小区R准准则排序排序目目标小区小区电平平满足条件足条件的的时间超超过Treselection触触发重重选原小区原小区驻留留时长超超过1s收到新小区收到新小区MIB收到新小区收到新小区SIB收到重收到
4、重选成功成功消息消息完成重完成重选NYNYTitle:Type:ArialSize:22-24ptColor:The ZTE blue Subtitle:Type:ArialSize:14-18ptColor:The ZTE greenG143,B212R140,G198,B62R90,G203,B245 ZTE All rights reserved5内部公开UE重选测量启动准则协议原文:If the serving cell fulfils Srxlev SIntraSearchP,the UE may choose not to perform intra-frequency measu
5、rements.Srxlev=Qrxlevmeas Qrxlevmin Pcompensation Qoffsettemp Srxlev:小区选择接收电平值(dB)Qrxlevmeas:服务小区的小区接收电平值(RSRP)Qrxlevmin:小区选择所需的最小RSRP接收水平(dBm)(ZTE:selQrxLevMin)Pcompensation:max(PEMAX_H PPowerClass,0)(dB)(ZTE:intraPmax)Qoffsettemp:UE接入小区失败后的惩罚性偏置。(ZTE:connEstFailOffset)SIntraSearchP:指示小区重选过程中是否执行同频
6、测量的RSRP判决门限。(ZTE:IntraSrchP)Title:Type:ArialSize:22-24ptColor:The ZTE blue Subtitle:Type:ArialSize:14-18ptColor:The ZTE greenG143,B212R140,G198,B62R90,G203,B245 ZTE All rights reserved6内部公开候选小区选择S准则S准则:候选小区 Srxlev0且Squal 0Srxlev=Qrxlevmeas (Qrxlevmin+Qrxlevminoffset)PcompensationSrxlev:候选小区选择接收电平值(d
7、B),UE根据此值的来判断是否选择目标小区Qrxlevmeas:候选小区参考信号接收功率 RSRP值,单位dB。Qrxlevmin:候选小区选择所需的最小RSRP接收水平(dBm)(ZTE:selQrxLevMin)Pcompensation:max(PEMAX_H PPowerClass,0)(dB)(ZTE:intraPmax)Qrxlevminoffset:小区选择所需的最小RSRP接收电平偏移(dB),该参数仅在跨PLMN重选时才用到,不存在时默认为0。(ZTE:ucQrxLevMinOffst)Title:Type:ArialSize:22-24ptColor:The ZTE blu
8、e Subtitle:Type:ArialSize:14-18ptColor:The ZTE greenG143,B212R140,G198,B62R90,G203,B245 ZTE All rights reserved7内部公开候选小区选择S准则Squal=Qqualmeas Qqualmin QoffsettempSqual:小区选择接收质量值(dB),UE根据此值的来判断是否选择目标小区Qqualmeas:候选小区参考信号接收功率 RSRQ值,单位dB。Qqualmin:候选小区满足频内小区重选条件的最小质量电平门限(ZTE:intraFreqQqualMin/interFreqQqu
9、alMin)Qoffsettemp:小区选择所需的最小RSRQ接收电平偏移(dBm)(ZTE:qQualminoffset)Title:Type:ArialSize:22-24ptColor:The ZTE blue Subtitle:Type:ArialSize:14-18ptColor:The ZTE greenG143,B212R140,G198,B62R90,G203,B245 ZTE All rights reserved8内部公开小区重选R准则UE将为所有满足小区选择S准则的小区按R准则定级排队,如果某个小区排队为最好小区,UE将对该小区执行重选。Rs=Qmeas,s+QhystR
10、n=Qmeas,n QoffsetRs:服务小区定级值。Rn:邻区定级值。Qmeas:小区重选时测得的RSRP值。Qhyst:服务小区重选迟滞(dB)(ZTE:Qhyst)Qoffset:重选时相邻小区对服务小区偏差(dB)。(ZTE:QOffSetCell)Title:Type:ArialSize:22-24ptColor:The ZTE blue Subtitle:Type:ArialSize:14-18ptColor:The ZTE greenG143,B212R140,G198,B62R90,G203,B245 ZTE All rights reserved9内部公开覆盖优化流程优化开
11、始化开始测试准准备:确定确定优化目化目标确定确定测试路路线准准备测试工具工具数据采集:数据采集:DT测试CQT测试站点配置数据站点配置数据后台指后台指标指指标满足要求足要求优化化结束束问题分析:分析:越区覆盖越区覆盖弱覆盖弱覆盖无主服小区无主服小区优化化调整:整:工参工参调整整邻区关系区关系调整整无无线参数参数调整整NYTitle:Type:ArialSize:22-24ptColor:The ZTE blue Subtitle:Type:ArialSize:14-18ptColor:The ZTE greenG143,B212R140,G198,B62R90,G203,B245 ZTE Al
12、l rights reserved10内部公开覆盖常见问题和分析方法弱覆盖小区可以通过增强参考信号功率、调整天线方向角和下倾角,增加天线挂高,更换更高增益天线等方法来优化覆盖,同时要注意覆盖范围增大后可能带来的内外部干扰。越区覆盖小区1.减小越区覆盖小区的功率;2.增大天线下倾角;3.调整天线方向角;4.降低天线高度;无主服小区通过调整天线下倾角和方向角等方法,增强某一强信号小区(或近距离小区)的覆盖,削弱其他弱信号小区(或远距离小区)的覆盖。以上调整需要考虑对其它制式共天馈小区所带来的影响。Title:Type:ArialSize:22-24ptColor:The ZTE blue Subt
13、itle:Type:ArialSize:14-18ptColor:The ZTE greenG143,B212R140,G198,B62R90,G203,B245 ZTE All rights reserved11内部公开外场测试重选参数建议设置值参数名 参数缩写外场测试建议值小区选择所需的最小RSRP接收水平(dBm)selQrxLevMin-120小区选择所需的最小RSRP接收电平偏移(dB)qrxLevMinOffst 2UE发射功率最大值(dBm)intraPmax 23UE发射功率最大值偏移(dBm)intraPmaxOffset 4服务小区重选迟滞(dB)qhyst 1配置Snon
14、intrasearch参数 sNintraSrchPre 0同/低优先级RSRP测量判决门限(dB)snonintrasearch 14频内重选UE发射功率最大值(dBm)iIntraPmax 23频内重选UE发射功率最大值偏移(dBm)iIntraPmaxOffset 4频内小区重选最小接收水平(dBm)intraQrxLevMin-120配置同频RSRP门限 intraSearch 0频内小区重选判决定时器时长(秒)tReselectionIntraEUTRA 0小区重选过程中是否执行同频测量的RSRP判决门限(dB)IntraSrchP 62小区重选过程中是否执行异频测量的RSRP判决门限(dB)IntraSrchP 50UE监听寻呼场合的DRX循环周期(Radio Frames)defaultPagingCycle 1连接建立失败偏移值 connEstFailOffset_r13 0重选时相邻小区对服务小区偏差(dB)qofStCell 1谢谢!