The busy hour is calculated as follows independent of vendor:
1. BSC BH
obtain the 24 hr traffic profile of each BSC(if more than one BSC ib the network).You can then use excel to filter the maximum carried traffic over the 24 hr period. This should give the BSC BH.
2. Cell BH
The same process is repeated just that in this case it is taken at cell level.
Note that total BSC BH carried traffic is not equal to Cell BH carried traffic.
Hope this helps.