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[計算機(jī)軟件及應(yīng)用]tems基本介紹與使用-文庫吧資料

2025-01-25 17:28本頁面
  

【正文】 0 – UL case: link_fail counter decreases to 0 – Layer 2: BSS/MS send SABM/DISC in every T200 for N200+1 times, and no response from recipient Reason: – All cases in this presentation – Refer to GSM BSS Statistics Analysis Handbook 2022/2/16 39 Drop Call (2) 2022/2/16 40 Sudden Power Drop (1) Description: – Dedicated ARFCN has significant nonpower control rxlevel difference from rxlevel of BCCH Reason: – No/improper TX power calibration – Faulty ancillary. . biner, filter.. – Different cable lengths from BTS to antennas – Due to air bing, so antennas have different coverage footprints 2022/2/16 41 Sudden Power Drop (2) 2022/2/16 42 Description: – MS rapidly increases its TX power due to ? Optimised Power Control or ? UL SACCH multiframes aren’t received for link_fail link_about_to_fail times Reason: – Sudden UL interference, . wideband repeator, channel interference – Too much rapid power down – l_rxlev_ul_p is too small MS Power Rapid Increase (1) 2022/2/16 43 MS Power Rapid Increase (2) UL power rapid increase from 19 to 5 suddenly 2022/2/16 44 How GEP Help? Help to identify below problem in VISUAL basis ? Cochannel interference ? AdjacentChannel interference ? Mutual neighbor ? Missing neighbor ? Unreasonable neighbor ? Incorrect external neighbor 2022/2/16 45 How VOT Help? Help to identify below problem in VISUAL basis ? Ping pong HO ? Overshooting ? No dominant server ? Poor coverage ? Unreasonable serving area ? Interference ? HO failure ? HO loss ? Drop call 2022/2/16 46 How CM Extractor Help? Extract most BSS parameter for reference ? Cell – . hreqave,hreqt,N,P… ? BTS – . antenna_select… ? RTF – check any incorrect external neighbor ? Neighbor – . ho_margin, delay_timer… 2022/2
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