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Traditionally, Bluetooth has been deemed unsuitable for sustaining alarge-scale multi-hop network. There are two main reasons: severe frequencychannel collisions under a large-scale network and high complexity of designingan efficient formation protocol. In this work, we reconsider this viewpointfrom a practical usability perspective and aim to realize the buried potentialof Bluetooth. Firstly, we find that the collision probability under alow-overhead network is fairly small, which is acceptable for practicalapplications. Secondly, we propose BlueSky, a complete system solution toprovide necessary networking functionalities for Bluetooth. In BlueSky, wedevelop a connection maintenance mechanism for mitigating the influence ofcollisions and a network formation protocol for reliable packet transmissions.We implement BlueSky on Windows Mobile using 100 commercial smartphones.Comprehensive usability evaluations demonstrate the negligible overheads ofBlueSky and its good network performance. In particular, 90%-95% of the whole100 nodes can participate in the communication smoothly.

BlueSky: Realizing Buried Potential of Bluetooth to Sustain a Large-scale Multi-hop Network