通過愛立信RPMO平臺解決質(zhì)差掉話的分析案例作者：魏俊松郵箱：weijunsong@126.com所在?。汉邶埥￡P(guān)鍵字：質(zhì)差;TRX隱性問題設(shè)備廠家：愛立信設(shè)備類型:RBS2206專業(yè)：GSM無線網(wǎng)絡(luò)優(yōu)化軟件版本：R12故障現(xiàn)象：HGB776C_哈巴彥八號站在一月份統(tǒng)計中，存在較嚴(yán)重的上下行質(zhì)差。DATEPERIODEXCHIDOBJECT_IDCELL(RXQUALUL6&7%)(RXQUALDL6&7%)1501229001000HBSM15AHGB776C哈巴彥八號站3.52%10.43%15012218001900HBSM15AHGB776C哈巴彥八號站1.23%6.17%1501228000900HBSM15AHGB776C哈巴彥八號站1.23%15.62%15012310001100HBSM15AHGB776C哈巴彥八號站6.32%15.05%15012319002000HBSM15AHGB776C哈巴彥八號站7.03%18.00%15012320002100HBSM15AHGB776C哈巴彥八號站6.13%22.25%原因分析：1.是否存在告警。2.是否存在干擾。3.基站天線問題導(dǎo)致覆蓋問題。4.基站動態(tài)功率設(shè)置不合理。5.小區(qū)參數(shù)設(shè)置不合理。6.基站硬件或頻率問題。分析流程圖：質(zhì)差小區(qū)處理流程：掉話小區(qū)處理流程：具體問題分析：告警及小區(qū)MO定義問題查看小區(qū)告警情況及數(shù)據(jù)定義情況，沒有發(fā)現(xiàn)問題干擾情況小區(qū)4、5及干擾比例為0，不存在干擾。現(xiàn)場天線勘測由于該小區(qū)話務(wù)量較低，每小時話務(wù)量1Erl以下，采樣點(diǎn)較少，上站勘測該小區(qū)天線，發(fā)現(xiàn)HGB776C小區(qū)下傾角為12°，已達(dá)到最大值，塔工抬高天線，增大覆蓋范圍。調(diào)整天線下傾角后，觀察1月24日指標(biāo)，HGB776C(哈巴彥八號站)部分時段質(zhì)差情況有所好轉(zhuǎn)，話務(wù)量和掉話數(shù)較之前統(tǒng)計增多，如下表：DATEPERIODEXCHIDCELLTCH掉話數(shù)(RXQUALUL6&7%)(RXQUALDL6&7%)15012413001400HBSM15AHGB776C156.01%9.21%15012414001500HBSM15AHGB776C153.18%7.25%15012418001900HBSM15AHGB776C154.20%7.73%15012419002000HBSM15AHGB776C113.10%7.21%15012411001200HBSM15AHGB776C102.37%6.09%15012420002100HBSM15AHGB776C102.75%5.32%15012412001300HBSM15AHGB776C92.11%3.63%RPMO工具定位通過RPMO的擴(kuò)展掉話分析掉話原因：DateHourCellTCHDrops(#)TCHDrops(20)TCHDrops(24)TCHDrops(25)1/24/201515HGB776C146441/24/201519HGB776C142391/24/201514HGB776C134541/24/201513HGB776C123271/24/201518HGB776C11263原因24：測量報告丟失很多導(dǎo)致掉話，大量測量報告丟失一般是由于無線信道的性能下降甚至中斷造成，外部強(qiáng)干擾導(dǎo)致手機(jī)與網(wǎng)絡(luò)側(cè)交互中斷或者是覆蓋不好導(dǎo)致。原因25：指派丟號或者是切換丟失。切換丟失主要是指手機(jī)在進(jìn)行切換時，目標(biāo)小區(qū)切換失敗，且沒能成功回切到原小區(qū)，導(dǎo)致手機(jī)掉話。由于掉話為日?？湛诘粼?，通過TRX級別掉話分析，HGB776C(哈巴彥八號站)掉話集中在-2載波上，如下：DateBSCCellNames(H)HourTRXTRXTCHDrops(#)1/25/2015HBSM15AHGB776C14TRX-30-2151/25/2015HBSM15AHGB776C16TRX-30-2141/25/2015HBSM15AHGB776C12TRX-30-2141/24/2015HBSM15AHGB776C19TRX-30-2131/25/2015HBSM15AHGB776C8TRX-30-2121/24/2015HBSM15AHGB776C15TRX-30-2121/25/2015HBSM15AHGB776C19TRX-30-2111/24/2015HBSM15AHGB776C18TRX-30-2111/24/2015HBSM15AHGB776C14TRX-30-2111/24/2015HBSM15AHGB776C13TRX-30-211解決辦法：嘗試將HGB776C(哈巴彥八號站)-2載波所在的主頻BCCH：83->71，通過更改主頻，HGB776C掉話明顯下降，同時，上下行質(zhì)差均有明顯改善，具體指標(biāo)如下：DATEPERIODEXCHIDCELLCELLTCH掉話數(shù)RXQUALUL6&7%RXQUALDL6&7%15012708000900HBSM15AHGB776C哈巴彥八號站40.89%3.03%15012709001000HBSM15AHGB776C哈巴彥八號站22.38%5.22%15012710001100HBSM15AHGB776C哈巴彥八號站10.91%2.70%15012718001900HBSM15AHGB776C哈巴彥八號站31.08%1.39%15012719002000HBSM15AHGB776C哈巴彥八號站21.28%2.18%15012720002100HBSM15AHGB776C哈巴彥八號站32.36%2.19%15012618001900HBSM15AHGB776C哈巴彥八號站30.94%1.96%15012619002000HBSM15AHGB776C哈巴