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2025-01-25 09:29本頁面
【正文】 link_fail counter decreases to 0– Layer 2: BSS/MS send SABM/DISC in every T200 for N200+1 times, and no response from recipientReason:– All cases in this presentation– Refer to GSM BSS Statistics Analysis HandbookDate 38Drop Call (2)Date 39Sudden Power Drop (1)Description:– Dedicated ARFCN has significant nonpower control rxlevel difference from rxlevel of BCCHReason:– 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 Date 40Sudden Power Drop (2)Date 41Description:– 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 timesReason:– Sudden UL interference, . wideband repeator, channel interference– Too much rapid power down– l_rxlev_ul_p is too smallMS Power Rapid Increase (1)Date 42MS Power Rapid Increase (2)UL power rapid increase from 19 to 5 suddenlyDate 43How GEP Help?Help to identify below problem in VISUAL basis? Cochannel interference? AdjacentChannel interference? Mutual neighbor? Missing neighbor? Unreasonable neighbor? Incorrect external neighborDate 44How 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 callDate 45How 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…Date
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