Well, the BHCA capacity is just computed accordingly to the capacity in erlangs. It depends on the values used in the ALU traffic assumptions.
When you say traffic load, it is :
total of all RTCH_Erlang_total ( TCTRE ) for all cells at the same hour…
divided by Erlang Capacity of the BSC (which is depending on configuration).
The traffic load is certainly a better way to assess the actual load of the BSC.
In B10 and in the BSC evolution only, there is this counter :
MC926 : Each time the CCP reaches the limit defined by the MAX_TCH_PER_CCP parameter.
Otherwise, that’s all I can think of… Do you see high CDR or poor CSSR during the busy hour ?