IHO参数优化方案

河池IHO参数优化方案通过增加小区内切次数降低掉话率方案。目前掉话统计指标计算公式为：CELTCHFP:TFCONGPGSMSUB/CELTCHF:TFMSESTB+CELTCHH:THMSESTB。而CELTCHF:TFMSESTB和CELTCHH:THMSESTB在alex中解释是ThesecounterscountthenumberofconnectionssuccessfullyestablishedontheTCH.TheMSisregardedtohaveestablishedaconnectionontheTCHwhenanASSIGNMENTCOMPLETE,HANDOVERPERFORMEDorintargetBSC,HANDOVERCOMPLETEmessageissenttotheMSC.ThecountersarealsosteppedwhenanSCCPCONNECTIONCONFIRMisreceivedfromtheMSC.小区内切换信令流程如上图所示，因此适当增加小区内切换次数可能会使掉话率分母增加（小区内切信令流程中有MSC收到HOPerformed）从而降低掉话率。以下就此进行可行性分析。参数定义：IHO：小区内切换的开关控制参数，ON或OFF。SSOFFSETUL：在上行链路上设置信号强度的OFFSET。SSOFFSETDL：在下行链路上设置信号强度的OFFSET。QOFFSETUL：在上行链路上设置质量的OFFSET。QOFFSETDL：在下行链路上设置质量的OFFSET。MSCBSCBTSMS2ChannelActivation3ChannelActivationAck4AssigmentCommand(FACCH)5MeasurementReport(SACCH)1Prep_MeasurementResultSABM(FACCH)6EstablishIndication7UA(FACCH)8AssignmentComplete(FACCH)9ReleaseRequest12ReleaseConfirmation13ReceiverReady(FACCH)10HOPerformed11RFChannelRelease14RFChannelReleaseAck15TMAXIHO：针对切换计数器的计时器。小区内切换间的最大时间间隙。MAXIHO：允许的连续小区内切换的最大次数。TIHO：小区内切换功能是在相同的子小区内的符合要求的不同的时隙或信道之间的切换。试点小区选择：根据近一周差小区数据找出掉话率差但同时掉话次数较少的小区作为此次实验的目标小区。cellid上行内切平均值最近1周频次平均值项:TCH占用次数含切换掉话率降为3%需要新增TCH占用次数（按平均值）RxQualUL0ULRQ3百分比ULRQ4百分比ULSS-90百分比HD4372217.6729162.70204.9278.59%11.39%8.50%45.52%HJ1562121.004104.4362.2385.14%8.57%6.33%42.31%HF1303321.338829.75366.0879.34%15.89%12.75%65.11%HC314520.674127.0039.6796.16%2.22%1.58%63.34%HC304932.006218.5064.8391.40%3.95%2.20%57.92%HJ152413.676205.5260.0879.04%12.77%8.70%32.01%HF139111.337156.6732.2298.62%0.83%0.55%31.87%HJ181522.674216.6443.9796.63%1.74%1.19%30.51%现网参数设置情况：EXCHIDCELLIHOMAXIHOTMAXIHOTIHOHCB10R12HJ15241ON10610HCB10R12HJ15621ON10610HCB10R12HJ18152ON10610HCB3R12HC30493ON2610HCB3R12HC31452ON3610HCB4R12HD43722ON10610HCBSC6R12HF13033ON2610HCBSC6R12HF13911ON3610EXCHIDCELLSSOFFSETULPSSOFFSETULNSSOFFSETDLPSSOFFSETDLNQOFFSETULPQOFFSETULNQOFFSETDLPQOFFSETDLNHCB10R12HJ152411185050HCB10R12HJ156211185050HCB10R12HJ181521185050HCB3R12HC304930000HCB3R12HC314521181212HCB4R12HD437221185050HCBSC6R12HF130330000HCBSC6R12HF139111181212EXCHIDCELLQOFFSETDLAFRNQOFFSETDLAFRPQOFFSETULAFRNQOFFSETULAFRPSSOFFSETDLAFRNSSOFFSETDLAFRPSSOFFSETULAFRNSSOFFSETULAFRPHCB10R12HJ152410000HCB10R12HJ156210000HCB10R12HJ181520000HCB3R12HC304930000HCB3R12HC314520000HCB4R12HD437220000HCBSC6R12HF130330000HCBSC6R12HF139110000参数设置建议：计时器设置为不限制连续切换，即将TMAXIHO设置小于TINIT如TMAXIHO=3；放开上行15dB信号强度限制，设置SSOFFSET=15，则信号强度在-95dBm以下时不会发生内切换。使RxQual3-7级可发生IHO，设置QOFFSET=-20，则信号质量在3级时可发生小区内切换。小区内切的条件为：为了确定一个小区内切换在哪个rxqual电平值上被允许进行，SSOFFSET被加入这个RXLEV_UL值中，总和用于作为table1中的表中的指标。以我们设置参数的例子，这个指标为：31+15=46。在表中将可获得这个指标的对应值为：55。QOFFSET被加入这个值中：57-20=37。这意味着在包括rxquall必须大于这个总和37才允许进行小区内切换。参数修改RLIHC:CELL=cell,TMAXIHO=3,SSOFFSETULP=15,SSOFFSETULAFRP=15,SSOFFSETDLP=15,SSOFFSETDLAFRP=15,QOFFSETULN=20,QOFFSETULAFRN=20,QOFFSETDLN=20,QOFFSETDLAFRN=20，TMAXIHO=15，MAXIHO=5，TIHO=10;