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Báo cáo hóa học: " Research Article Cost-Based Vertical Handover Decision Algorithm for WWAN/WLAN Integrated Networks"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Cost-Based Vertical Handover Decision Algorithm for WWAN/WLAN Integrated Networks | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2009 Article ID 372185 11 pages doi 10.1155 2009 372185 Research Article Cost-Based Vertical Handover Decision Algorithm for WWAN WLAN Integrated Networks KunHo Hong 1 SuKyoung Lee 1 LaeYoung Kim 2 and PyungJung Song3 1 Department of Computer Science Yonsei University Seoul 120-749 South Korea 2LG Electronics South Korea 3Electronics and Telecommunications Research Institute ETRI Daejon 305-700 South Korea Correspondence should be addressed to SuKyoung Lee sklee@cs.yonsei.ac.kr Received 31 October 2008 Revised 5 March 2009 Accepted 28 May 2009 Recommended by Mohamed Hossam Ahmed Next generation wireless communications are expected to rely on integrated networks consisting of multiple wireless technologies. Heterogeneous networks based on Wireless Local Area Networks WLANs and Wireless Wide Area Networks WWANs can combine their respective advantages on coverage and data rates offering a high Quality of Service QoS to mobile users. In such environment multi-interface terminals should seamlessly switch from one network to another in order to obtain improved performance or at least to maintain a continuous wireless connection. Therefore network selection algorithm is important in providing better performance to the multi-interface terminals in the integrated networks. In this paper we propose a cost-based vertical handover decision algorithm that triggers the Vertical Handover VHO based on a cost function for WWAN WLAN integrated networks. For the cost function we focus on developing an analytical model of the expected cost of WLAN for the mobile users that enter the double-coverage area while having a connection in the WWAN. Our simulation results show that the proposed scheme achieves better performance in terms of power consumption and throughput than typical approach where WLANs are always preferred whenever the WLAN access is available. Copyright 2009 KunHo Hong et al.