TD载波扩容步骤及需注意事项 (一) 扩容理论分析 由于码资源利用率与覆盖场景、网络干扰和频率规划等有关,根据对TD系统的仿真结果,考虑接通率、切换成功率、掉话率、用户满意度等指标,在2:4的时隙配置下,上行资源会受限,并且考虑为切换用户预留12.5%的资源,满足性能要求的平均每载波的用户数目和资源占用比如下表所示: 1、R4业务说明 对于R4业务,主要是通过忙时的码资源利用率来进行资源的评估,如果忙时实际统计指标R4码道业务信道利用率超过60%~70%,则需要考虑扩容。 2、H业务说明 对于H载波,除了考虑伴随信道的资源占用外,还可以参考如下指标:忙时单载波平均接入用户数建议值为[3~8],忙时HSDPA业务信道利用率在60%~70%,码道承载能力约为16kbps,若实际统计指标超出以上建议值,则已达到容量承载上限,需要考虑扩容。 (二) 扩容步骤 TD的扩容分为 H载波扩容和R4载波扩容,两种载频扩容的操作不一样,下面分别先容 1. H载波扩容 载波扩容需要在RNC侧和NODEB侧同时添加载波资源 RNC侧添加载波步骤: (1):扩容前查询小区最大发射功率: LST TCELLSTTYPE=BYCELLID,CELLID=60428; 根据小区配置的最大发射功率,结合扩容后小区载波数算出扩容后载波功率 计算公式:(小区最大发射功率/10-10*log10(扩容后载波数))/10 如果该小区载频功率配置过大的话则依次修改现有载频功率: MOD TCARRIER:CELLID=XXX,CARRIERINDEX=XXX,CARRIERMAXPWR=XXX; (2):增加载波脚本 ADD TCARRIER:CELLID =60428, CARRIERINDEX =SECONDARY_4, OVERLAYRANGE = FULL_OVERLAY, UARFCN =10112, DCHCARRIERORDER = 0, HSDPACARRIERORDER = 80, HSUPACARRIERORDER = 0, CARRIERMAXHSDPAUSERNUM = 24, CARRIERMAXHSUPAUSERNUM = 16, TSSWITCHPOINT = 2_4,TIMESLOTSTATUS = TIMESLOT1-1&TIMESLOT2-1&TIMESLOT3-1&TIMESLOT4-1&TIMESLOT5-1&TIMESLOT6-1, TIMESLOT1ORDER = 1, TIMESLOT2ORDER = 2, TIMESLOT3ORDER = 2, TIMESLOT4ORDER = 3, TIMESLOT5ORDER = 3, TIMESLOT6ORDER = 3,CARRIERTYPE = HSDPA-1&MBMS-1&HSUPA-1, CARRIERMAXPWR = 419; 需要注意事项:一:注意载频发射功率不要大于之前算的功率 二:注意HSDPA最大用户数,最好设置为24 (3):增加小区环境参数 ADD TCELLENVALGO:CELLID = 60428, CARRIERINDEX =SECONDARY_4, ULINTERFACTOR = 60, DLINTERFACTOR = 60, BACKGROUNDNOISE = 61, BGNFILTERCOEF = 100, BGNADJUSTTIMELEN = 30, BGNEQUSERNUMTHD = 0, BGNUPDATETHD = 50, BGNABNORMALTHD = 100; (4):增加DPCH复用参数 ADD TCELLDPCHMULTPARA:CELLID =60428, CARRIERINDEX =SECONDARY_4, MAX34KDLSIGDPCHMULTUSERNUM = 8, DL34KSIGREPETITIONPERIOD = D8, DL34KSIGREPETITIONLENGTH = D4, MAX136KDLSIGDPCHMULTUSERNUM = 24, DL136KSIGREPETITIONPERIOD = D8, DL136KSIGREPETITIONLENGTH = D4, MAXULSIGDPCHMULTUSERNUM = 8, ULSIGREPETITIONPERIOD = D2, ULSIGREPETITIONLENGTH = D1, MAXULDPCHMULTUSERNUM = 24, ULDPCHREPETITIONPERIOD = D8,ULDPCHREPETITIONLENGTH = D4, EQUALHSDPAUSERPERCENT = 50; (4):增加HSDPA控制信道对 ADD THSCONTROLCHAN:CELLID =60428, CARRIERINDEX =SECONDARY_4, SCCHID =13, SCCHTS = 6, SCCHCHANNELISATIONCODE1 = 16/1, SCCHCHANNELISATIONCODE2 = 16/2, SCCHMAXPWR =-30, SICHID =13, SICHTS = 2, SICHCHANNELISATIONCODE = 16/15; 需注意事项:HS-SCCH标识最好规律性添加,如扩容辅2载波,第一对控制信道的SCCHID为2,第二对SCCHID为12;辅3载波,第一对控制信道的SCCHID为3,第二对SCCHID为13,以此类推,便于后面优化操作。 (5):增加HSDPA下行物理共享信道 ADD THSPDSCH:CELLID =60428, CARRIERINDEX = SECONDARY_4, TS0SWITCH=OFF,TS2SWITCH = OFF, TS3SWITCH = ON, TS3CHANNELISATIONCODESTART = 16/1, TS3CHANNELISATIONCODEEND = 16/16, TS3HSMAXPWR = 300, TS3TRANSFSWITCH = HSDPA, TS4SWITCH = ON, TS4CHANNELISATIONCODESTART = 16/1, TS4CHANNELISATIONCODEEND = 16/16, TS4HSMAXPWR =300, TS4TRANSFSWITCH = HSDPA, TS5SWITCH = ON, TS5CHANNELISATIONCODESTART = 16/1, TS5CHANNELISATIONCODEEND = 16/16, TS5HSMAXPWR = 300, TS5TRANSFSWITCH = HSDPA,TS6SWITCH = OFF; 需注意事项:新扩载波的TD3/4/5HSMAXPWR与该小区前载波功率一致 (6):激活载波的HSDPA ACTHSDPA TCARRIER:CELLID =60428, CARRIERINDEX =SECONDARY_4; (7):激活载波 ACT TCARRIER:CELLID =60428, CARRIERINDEX =SECONDARY_4;
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