Well what is your established QOS. These PI's will depend on the carrier and
what they want to spend to deliver a sound network. What kind of coverage
area are we asking about. Is it urban or rural, is the area in question in
the core of the network or the edge of the network.

But to keep it simple, most carriers do not like to exceed greater than a 2%
drop call rate system wide, individual cells may vary, but system wide is
designed for less than 2%. Same thing for your unsuccessfull handovers, as
this drives up system overhead in regards to paging traffic. And this PI can
be impacted on where the cell is located, and can be related to call
blocking in the busy core section of a network, where you are seeing more
and more microcells coming into play, and handover solutions to merge these
microcells into a tiered handover structure like in the overlay method.