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Case 4 represents the solution where we need to access the central
controller which, after authentication and consultation of the profile,
allows the client to access the Internet.
Figure 5.10. Access authorization cases for a controller
5.4. Mobility protocols
The convergence of landline and mobile telephones means that any
application installed on a server can be used from a fixed or mobile
device. The first condition to achieve this convergence is that a mobile
be able to remain connected to the network whilst moving around,
without the functioning of the application being interrupted. Changes
of cell (known as handovers) must take place transparently and
seamlessly, with the same quality of service being maintained if the
application requires it.
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