Hi Ishu.
There are 2 methods
One
You can enable TCH observation for that cell & can analyse the clear codes.
Two
You can check the raw counters of dcr_8h(TCH drop call ratio after TCH assignment)to find out which type of drop call is happening after TCH assignment,Is it tch_rf_fai or tch_abis_fail or tch_tr_fail etc ,etc……..
Br\\
Bijoy