Seamless handover management scheme under multi-rate WLANs

Authors:
Kazuya Tsukamoto;Yuji Oie;Shigeru Kashihara;Yuzo Taenaka
Affiliations:
Kyushu Institute of Technology, Kawazu, Iizuka, Japan;Kyushu Institute of Technology, Kawazu, Iizuka, Japan;Nara Institute of Science and Technology;The University of Tokyo
Venue:
Proceedings of the 8th International Conference on Advances in Mobile Computing and Multimedia
Year:
2010

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Abstract

In ubiquitous Wireless LANs (WLANs), Mobile Nodes (MNs) are likely to experience many and frequent handovers between WLANs managed by different organizations/ISPs during TCP communication. Although we proposed a WLAN handover management scheme based on the number of frame retransmissions, the proposed scheme cannot adapt to multirate WLAN used in a more realistic environment. Furthermore, the handover is controlled based on only a predetermined threshold of the number of frame retransmissions, thereby degrading the performance drastically when the inappropriate threshold is employed. Therefore, in this paper, to enhance the practicality of handover scheme in a realistic environment where WLAN supports multiple data rates and automatically changes the rate in response to wireless link condition, we propose a handover management scheme adaptable to multi-rate WLANs. Our scheme exploits two sorts of information to recognize the wireless condition appropriately: (1) data rate used most frequently (DRMF) by each interface and (2) frame retransmission ratio (FRR) on each interface for some duration. The former of two criteria first enables us to estimate an area where we should start handover, and if DRMFs of two interfaces are same in the area, the latter then allows us to compare wireless condition on two interfaces precisely, thereby giving an optimal handover point. The simulation results demonstrate the advantages of the proposed method, especially in the multi-rate WLAN environment.