  Networks Lte(4G) and Wi-Fi complementarity establishes a heterogeneous system
of wireless and mobile networks. We study and analyze the optimal performances
of this heterogeneous system based on the bit rate, the blocking probability
and user connection loss. Random Waypoint (RWP) is the user mobility model.
Users provided mobile terminal equipped with multiple accesses interfaces. We
developed a Markov chain to estimate the performances obtained from the
heterogeneous networks system, which allowed us to propose an average bit rate
value in a sub-zone of this system then the average blocking probability user
connection in this zone. We also proposed a sensitivity factor of maximal
decrease of these selection network parameters. This factor informs about the
heterogeneous networks congestion and dis-congestion system.
