BSS Drop RTC are due to HW failures…
1/ either a faulty board in the BTS, in the BSC or in the TC
2/ or a faulty interface : Abis or AterMux failures
–> you cannot fix this with a parameter.
If you can find which board or interface is faulty, you could lock it and transfer the load to another board.
BSS Drop due to internal failures are usually due to O&M commands (lock/unlock/reset/restart).
Priority : fix your HW failures, and once it is done (–> rtc drop = 0), check if the “internal failures” are still there. Cuz they might be a side-effect of the “RTC drop” problem.