Reason for SDCCH DROP in GSM Network

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·         Low Rx level DL& UL, Bad Qual (Interference ) DL & UL, and High TA
·         Drop on LAC boundary.
·         SW congestion
·         Due to TCH Congestion.
·         Hardware issue, Timeslot Faulty, High VSWR, Alarm or Antenna Faulty, mismatch combining.
·         Interference or error on E1.
·         Drop due to radio failure.
·          SD drop due to MS faulty.
·         SD drop due to mismatch Rxlev_access_min value & RACH busy threshold

·         SD drop due to mismatch BA2 list, due to drop occur during HO.

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