CDMA网络优化高级培训.pptVIP

第一部分 CDMA System Optimization Optimization Neighbor List Pilot pollution Coverage holes Search window size Access failures Pilot surprise CDMA System Parameters 手机和系统之间的主要信令： PSMM:Pilot Strength Measurement Message(反向) EHDM:Extended Handoff Destination Message(前向) HCM: Handoff Complete Message(反向) NLUM:Neighbor List Update Message(前向) PMRM:Power Measurement Report Message(反向) ITSPM:In-traffic System Parameter Message(前向) Setting Parameters There are two levels at which parameters are set: 1、At the carrier-sector level (local 参数) 2、At the CBSC level (global 参数) Handoff Parameters Handoff Mode: CBSC：Tadd mode、TComp mode Sector: Neighbor Lists、DAHO Indicator 、Tadd 、Tdrop 、TTdrop 、Tcomp Mobile Search Windows: CBSC: Add Intercept 、Drop Intercept Sector:SrchWinA 、SrchWinN 、SrchWinR SrchWinA Active and Candidate set search window size This size is made large enough to incorporate 95% of expected delay spread energy Small window size may lead to not detecting useful multipath energy Common starting value:28 chips 1 km = 4.1 PN chips 1 Km光纤=1.7 km(空间)=7 PN chips 例：手机在离A站(PN=10)1km和离B站(PN=20)3km的地方同时和两个基站通话 Cell Size Parameters CBSC: PilotInc Sector: 1、SifPilotPwr(机顶发射pilot的功率) 2、Cell radius(决定PamSz和AchPamWinSz, 并决定基站的半径) 3、TchAcqWinSz(This parameter is used by the target sector traffic channel when acquiring the mobile on a handoff add.It must be as large as “AchWinSz”) Forward Power Control 见 图-1 State Diagram of Forward Power Contral 见 图-2 SMAP System Monitoring Application Processor 该工具直接从FEP中取得反向信道的消息（FER IS-95 messaging） 可以同时跟踪10部手机或者跟踪某个扇区的所有Call. CDL （Call Detail Logs） Generated by the MM at the end of a call Logged at the OMC-R Send to the OMC-R in a binary format within CDL event files CDL Analysis Tool(可以统计：Top 20; Distribution; Pareto) CDL部分参数分析 ACCESS_PN_OFFSET(手机和基站的码片偏差) ENTRY _TYPE（呼叫类型：0-主叫；1-被叫） SERVICE _OPTION（服务类别：话音、数据等） NEGOTIATED _SO（最终确定的服务类别） LAST _MM _SETUP _SO（18-23都是属于正常范围，如果有问题，也与基站无关） 第二部分 Call Processing Call Processing(Call