For comparison of all algorithms, three metrics are defined:
average amount of scanned cells, call drop rate, and outage
probability. The average amount of scanned cells is calculated
as an average of the number of scans performed by all UEs in
each simulation step over the simulation time. Call drop rate is
the ratio of handovers that lead to the SINR lower than SINRmin
to the overall number of handovers performed during the
simulation. Last, the outage probability is the ratio of the time
when SINR observed by the UEs is below SINRmin to the
overall simulation time.