Hello imanudin,
About the LAC boundries,it is the bifercation made for a region.That is a perticular region is given a perticulat number so that ,eg a paging message can be forwarded for a restristed area instead of the entair network.LAC boundries can be designated depending on 1)area
2)BSC.That is for one bsc a perticulat lac can be given.or for a perticular boundrie of area.
The inter BSC handover is the process in which ho takes place between two differen BSC.
The intra BSC ho is handover between two different bts of the same bsc.
Thank you,