The emerging wireless applications with stringent QoS
requirements continue to demand more spectrum resources.
Spectrum sharing is the key solution to deal with the problem
of spectrum scarcity. In this paper, we have studied the
network selection problem in 5G heterogeneous networks.
We have proposed a network selection mechanism and formulated
an optimization problem for network selection to
minimize the interference to primary networks and cost paid
by SUs. We then solved the optimization problem with the
PSO and modied GA in order to nd near-optimal solution.
We have also designed two scenarios for performance evaluation
with different system settings, SU data rate demands,
and price preferences. Then the performance of proposed
mechanism for network selection was evaluated under these
scenarios. The simulation results showed that the modied
GA outperforms the PSO and achieves a higher tness value
with less iterations in terms of both interference reduction and
SU price requirement.