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Abstract
As the number of network subscribers increases, it has become a very
challenging task to satisfy the ever-increasing demand of bandwidth by mobile
terminals using current infrastructures. Multi-homed terminals are proposed as
one of the possible solutions because of its bandwidth-aggregation feature, thus this
paper proposes a network selection algorithm for multi-homed mobile terminals
using movement prediction and MADM.
In this paper, network and movement models are establish in order to facilitate
the simulation. The algorithm predicts the positions of the user with Kalman
Filter, and then establish a list of RATs that are qualified as candidates using
information of predictions, finally the algorithm iterates through all combinations
of the candidates and evaluate the suitability of each combination based on three
attributes, namely monetary cost, power dissipation and bandwidth utility. Once
the most suitable set of interfaces are found, the user will switch his connections
to the most suitable combination of interfaces if the dead time has passed, in order
to alleviate the ping-pong effect.
In addition to making logical network interface selection decisions, the
simulation of the algorithm has also suggested that the prediction mechanism is
able to reduce the number of hand-overs caused by ping-pong effect and ensure the
ubiquitous connection within the prediction window period if the predictions are
reasonably accurate. Furthermore it is also observed that prediction mechanism
enhances the rationality of the decision making process in certain scenarios.