Fast Directional Handoff and lightweight retransmission protocol for enhancing multimedia quality in indoor WLANs

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More and more mobile devices such as smartphones are being used with IEEE 802.11 wireless LANs (WLANs or Wi-Fi). However, mobile users are still experiencing poor service quality on the move due to the large handoff delay and packet loss problem. In order to reduce the delay, a new handoff scheme using the geomagnetic sensor embedded in mobile devices is proposed in this paper. The proposed scheme predicts the movement direction of a Mobile Station (MS) from the currently associated Access Point (AP) and performs active scanning with a reduced number of channels. In terms of the packet loss, a lightweight retransmission protocol is also proposed to minimize lost packets on Wi-Fi without producing a lot of acknowledgement packets. The proposed approaches are implemented on Android smartphones, and their performance is evaluated in a real indoor WLAN environment. The evaluation results demonstrate that the proposed schemes maintain seamless quality for real-time video even in an environment with frequent handoffs. Note that the proposed schemes are a client-only solution and do not require modification of the existing APs, which renders them very practical.
Publisher
ELSEVIER SCIENCE BV
Issue Date
2015-03
Language
English
Article Type
Article
Keywords

WIRELESS LAN; IEEE-802.11; NETWORKS

Citation

COMPUTER NETWORKS, v.79, pp.133 - 147

ISSN
1389-1286
DOI
10.1016/j.comnet.2014.12.019
URI
http://hdl.handle.net/10203/198577
Appears in Collection
CS-Journal Papers(저널논문)
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