Journal of Theoretical and Applied Information Technology
In future the wireless networks will be heterogeneous and a mobile user has to roam between different access technologies. Achieving efficient Vertical Hand-Off (VHO) with guaranteed Quality of Service (QoS) in such heterogeneous environment still remains as an unsolved issue. VHO occurs when a mobile user changes his point of attachment from one type of wireless access network to another during an active communication session. Several VHO algorithms based on Received Signal Strength (RSS), Signal to Interference Noise Ratio (SINR) and bandwidth have been proposed in literature which are inadequate to provide QoS for real-time applications.