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

Authors:
Weetit Wanalertlak;Ben Lee;Chansu Yu;Myungchul Kim;Seung-Min Park;Won-Tae Kim
Affiliations:
School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, USA 97331;School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, USA 97331;Department of Electrical and Computer Engineering, Cleveland State University, Cleveland, USA 44115 and WCU Division of IT Convergence Engineering, Pohang University of Science and Technology (POS ...;Department of Computer Science, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, South Korea 305-702;Electronics and Telecommunications Research Institute (ETRI), Daejeon, South Korea;Electronics and Telecommunications Research Institute (ETRI), Daejeon, South Korea
Venue:
The Journal of Supercomputing
Year:
2013

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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.