1. In CDMA System, MS will handled by BTS that have strong power (if the BTS not have problem)but MS can read 3 Pilot Number (Case in our network), but just using 1 PN and other for handoff.
2. When BTS out of syncronisation the MS can’t handoff to other BTS (call drop). If happened out of sync. check your GPS antenna or other module that using for time syncronisation.
3. Just happened call drop when MS On call Busy moving from out of sync BTS to normal BTS (Handoff case). But if MS idle move from out of sync BTS to normal BTS, I think when the MS make a call, BTS will be repaging MS and now MS using normal BTS.
Please correct if wrong