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Scanless fast handoff technique based on global Path-Cache for WLANs

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Abstract

Wireless LANs (WLANs) have been widely adopted and are more convenient as they are interconnected as wireless campus networks and wireless mesh networks. However, time-sensitive multimedia applications, which have become more popular, could suffer from long end-to-end latency in WLANs. This is due mainly to handoff delay, which in turn is caused by channel scanning. This paper proposes a technique called Global Path-Cache (GPC) that provides fast handoffs in WLANs. GPC properly captures the dynamic behavior of the network and mobile stations (MSs), and provides accurate next-AP (access point) predictions to minimize the handoff latency. Moreover, the handoff frequencies are treated as time-series data, thus GPC calibrates the prediction models based on short-term and periodic behaviors of mobile users. Our simulation study shows that GPC virtually eliminates the need to scan for APs during handoffs and results in much better overall handoff delay compared to existing methods.

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Acknowledgements

The work described in this paper was supported in part by the NSF under Grant CNS-0821319, Korean NRF under WCU Grant R31-2008-000-10100-0, and IT R&D Program of MKE/KEIT [10035708, “The development of CPS core technologies for high confidential autonomic control software”].

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Authors and Affiliations

  1. School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR, 97331, USA

    Weetit Wanalertlak & Ben Lee

  2. Department of Electrical and Computer Engineering, Cleveland State University, Cleveland, OH, 44115, USA

    Chansu Yu

  3. WCU Division of IT Convergence Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja, Pohang, Gyeongbuk, 790-784, Korea

    Chansu Yu

  4. Department of Computer Science, Korea Advanced Institute of Science and Technology (KAIST), 119 Munji-ro, Yuseong-gu, Daejeon, 305-702, South Korea

    Myungchul Kim

  5. Electronics and Telecommunications Research Institute (ETRI), Daejeon, South Korea

    Seung-Min Park & Won-Tae Kim

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  1. Weetit Wanalertlak
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Correspondence to Ben Lee.

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Wanalertlak, W., Lee, B., Yu, C. et al. Scanless fast handoff technique based on global Path-Cache for WLANs. J Supercomput 66, 1320–1349 (2013). https://doi.org/10.1007/s11227-012-0805-7

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