110 Software Networks
enables the Cloudlets to simply connect with one another at acceptable
speeds to form a wider Cloud. In fact, there are two mobile Clouds:
one for each direction of travel of the vehicles.
Figure 5.6. Two mobile Clouds
A large mobile Cloud can be established when a traffic jam occurs,
as shown in Figure 5.7. When hundreds of vehicles are in the same
place, the overall power may become quite substantial. The vehicles
must be connected in a mesh network with specific protocols, such as
OLSR, to allow for data transmission between the vehicles.
5.3. Mobility control
Mobility is difficult to manage because the decisions essentially
need to be made in real time, and the motion means that it is
impossible to use powerful entities such as datacenters, which
are situated too far from the periphery, except perhaps if we
consider new technologies such as C-RAN, where the local loop
needs to be rethought, and replaced by an optical network. With few
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