1.1常用无线参数介绍GSM网络中的无线参数是指与无线设备和无线资源有关的参数，这些参数对网络中小区的覆盖、信令流量的分布、网络的业务性能等具有至关重要的影响，因此合理调整无线参数是GSM网络优化的重要组成部分。本章对网络优化过程中常用的一部分参数进行简单介绍。1.1.1参数体系及参数查看根据每个参数的控制范围，可以将参数分为BSC参数、BCF参数、BTS参数、TRX参数、切换(HOC)参数以及功控(POC)参数。
BSC级参数控制整个BSC，在该BSC下有效。可使用MML命令ZEEO:ALL;来查看该BSC下所有BSC级的参数。<ZEEO:ALL;BSC3iLYBSC442011-09-1717:19:05BASESTATIONCONTROLLERDATANUMBEROFPREFERREDCELLS........................(NPC)....3GSMMACROCELLTHRESHOLD..........................(GMAC)...35dBmGSMMICROCELLTHRESHOLD..........................(GMIC)...33dBmDCSMACROCELLTHRESHOLD..........................(DMAC)...26dBmDCSMICROCELLTHRESHOLD..........................(DMIC)...24dBmMSDISTANCEBEHAVIOUR............................(DISB)...255(NORELEASE,ONLYHANDOVERATTEMPTS)EMERGENCYCALLONFACCH..........................(EEF)....NANSWERTOPAGINGCALLONFACCH...................(EPF)....NORDINARYCALLSONFACCH..........................(EOF)....NRE-ESTABLISHMENTONFACCH........................(ERF)....YTCHINHANDOVER..................................(HRI)....5(TCHHASTOBEALLOCATEDPRIMARILYFROMTHEBESTBTS)LOWERLIMITFORFRTCHRESOURCES.................(HRL)....40%UPPERLIMITFORFRTCHRESOURCES.................(HRU)....60%FREETSLFORCSDOWNGRADE........................(CSD)....95%FREETSLFORCSUPGRADE..........................(CSU)....4sTRHOGUARDTIME..................................(TGT)....30sPRIORITYHOINTERFERENCEDL......................(HDL)....INTERPRIORITYHOINTERFERENCEUL......................(HUL)....INTERLOADRATEFORCHANNELSEARCH.....................(CLR)....100%TRIGGERINGTHRESHOLDFORSERVICEAREAPENALTY....(TTSAP)..127PENALTYTRIGGERMEASUREMENTPERIOD...............(PTMP)...128sSERVICEAREAPENALTYTIME........................(SAPT)...127sCSTCHALLOCATERTSL0............................(CTR)....NCSTCHALLOCATIONCALCULATION....................(CTC)....2CBDRXSCHEDULEPERIOD...........................(SCHP)...32MINIMUMMEANHOLDINGTIMEFORTCHS...............(MINHTT).4sMAXIMUMMEANHOLDINGTIMEFORTCHS.....