measurements, which is not an easy parameter to evaluate
In [MAN 09], the authors discuss the issues associated
with the selection of mobile gateways in an integrated
MANET-UMTS heterogeneous network. They use simple
additive weighting techniques to select an adequate gateway
based on residual energy, UMTS signal strength and mobility
speed of the gateway candidates.
In [SET 08], three metrics are used to select the gateway
that interconnects MANET with the infrastructure network:
energy, mobility and the number of hops based on a simple
additive weighting method. The node with the highest weight
will be selected as the gateway. These three metrics are not
enough to select the optimal gateway as the link from the
gateway to the infrastructure is not considered.
In [LIA 10], the authors propose dispersion sorting
mechanism (DSM). With DSM, the coverage of the road side
unit (RSU) is divided into two areas. One is an area that has
a good quality of communication, and the other is an area
that has poor quality of communication. The selected
gateway, called the RN, collects data from vehicles and
uploads data to the RSU. The advantages of this method are
that it expands the coverage of the RSU's service and reduces
the window period between RN and RSU communication.
The gateway selection criteria are as follows: first achieve a
good quality of communication with RSU and second a longer
time of communication with RSU. The authors formulate
these criteria using the positions and velocity of vehicles.
In [AMD 09], the authors propose a Scan-based AP
Selection (SAPS) and History-based AP Selection (HAPS)
method for infrastructure selection, called access point (AP)
selection. Instead of selecting a single AP as in traditional
schemes, SAPS sorts the scanned APs and generates an