Fast Directional Handoff and lightweight retransmission protocol for enhancing multimedia quality in indoor WLANs |
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Affiliation: | 1. The Department of Computer Science, Korea Advanced Institute of Science and Technology, Republic of Korea;2. The School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR 97330, USA |
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Abstract: | 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. |
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Keywords: | IEEE 802 11 Fast Directional Handoff Geomagnetic sensor Digital compass Lightweight retransmission protocol |
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