期刊名称：Journal of Theoretical and Applied Information Technology
印刷版ISSN：1992-8645
电子版ISSN：1817-3195
出版年度：2014
卷号：61
期号：2
出版社：Journal of Theoretical and Applied
摘要：In future the wireless networks will be heterogeneous and a mobile user has to roam between different access technologies. Achieving efficient vertical handoff (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. Hence we propose a Media Independent Handover(MIH) based QoS-aware VHO Decision Algorithm(QAVHA) which measures congestion in the target network in addition to SINR and bandwidth to provide always best connected service with guaranteed QoS. Our algorithm mainly focuses on reducing handoff delay and unnecessary handoffs to provide efficient handoff. We have chosen IEEE 802.11e and IEEE 802.16e heterogeneous environment. We have simulated these scenarios using NS2 and the performance characteristics are studied. When compared with the conventional VHO algorithm our proposed algorithm performs better during vertical handoff from WiFi to WiMax and vice-versa providing guaranteed QoS.
