Vertical handover decision using history-based communication graph for heterogeneous networks

The implementation of heterogeneous base stations in addition to the traditional macro cell architecture is considered as an additional amenity to existing resources in order to provide a greater capacity and Quality of Service to the mobile users. The future topology of these networks is foreseen as a combination of such networks creating a heterogeneous network. In such a topology, a user will be seamlessly mobile between all available networks and will have to perform a large number of vertical handovers. Due to sensitive timing of handover execution, the ping pong effect may lead to unsuccessful handovers, destroying the purpose of seamless connectivity. This paper presents a new history-based communication graph scheme to perform vertical handover. The proposed scheme has shown a greater number of successful handovers thus reducing the ping pong effect in heterogeneous networks.