An Improved Adaptive Decision Scheme for Vertical Handoff in Heterogeneous Wireless Networks

An Improved Adaptive Decision Scheme for Vertical Handoff in Heterogeneous Wireless Networks
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异构无线网络垂直切换的改进自适应决策方案

DOI:
10.1109/icccas.2006.285026
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发表时间:
2006-06
期刊:
2006 International Conference on Communications, Circuits and Systems
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垂直切换是多接口移动主机在异构无线网络之间的切换过程。目前已有许多研究集中在策略支持的垂直切换决策方案上,但大多数都没有提供切换度量获取的技术细节。在本文中,我们将 MAC 层感知技术引入到策略支持的决策方案中,该技术旨在估计 IEEE 802.11 WLAN(无线局域网)中的切换指标。此外,我们利用从 MAC 层感知获得的切换度量,改进了现有的稳定期预测自适应方案。仿真结果表明,所提出的自适应决策方案在稳定周期调整的敏感性和避免不必要的切换的能力方面优于以前的方案
Vertical handoff is the switching process of a multi-interface mobile host between heterogeneous wireless networks. There have been many researches focusing on policy-enabled vertical handoff decision schemes, but no technical details on handoff metric acquisition are provided in most of them. In this paper, we introduce the MAC layer sensing technique, which is designed to estimate the handoff metrics in IEEE 802.11 WLAN (wireless local area network), into the policy-enabled decision schemes. Furthermore, we improve the existing adaptive schemes for stability period prediction, making use of the handoff metrics obtained from MAC layer sensing. Simulation results show that the proposed adaptive decision scheme outperforms the previous schemes in terms of sensitivity of stability period adjusting and ability to avoid unnecessary handoffs
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