Mobile architecture
The handover is the action of switching a call in progress from
one cell to another (or between radio channels in the same cell).
The handover is used to allow established calls to continue when
mobile stations move from one cell to another.
The handover is also used as a method to minimize the
Roaming is the movement of the mobile terminal from one part of
the network coverage area to another part, while retaining the
capability of making or receiving calls in both areas.