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Mobile devices have shown to be very useful during and post disaster. If thecommunication infrastructure breaks down, however, they become almost uselessas most services rely on Internet connectivity. Building post-disaster networksbased purely on smartphones remains a challenging task, and, as of today, nopractical solutions exist. The rapidly growing Internet of Things (IoT) offersthe possibility to improve this situation. With an increase in smart spacessuch as smart homes and smart offices, we move towards digital cities that aredeeply penetrated by IoT technology. Many IoT devices are battery powered andcan aid in mediating an emergency network. In scenarios where the electricalgrid is still operational, yet communication infrastructure failed, non-batterypowered IoT devices can similarly help to relief congestion or build a backupnetwork in case of cyber attacks. With the recent release of the Bluetooth Meshstandard, a common interface between mobile devices and the IoT has becomeavailable. The key idea behind this standard is to allow existing and newdevices to build large-scale multi-hop sensor networks. By enabling hundreds ofdevices to communicate with each other, Bluetooth Mesh (BT MESH) becomes apractical technical solution for enabling communication post disaster. In thispaper, we propose a novel emergency network concept that utilises the parts ofdigital cities that remains operational in case of disaster, thus mediatinglarge-scale post-disaster device-to-device communication. Since the BluetoothMesh standard is backwards compatible to Bluetooth 4.0, most of todays mobiledevices can join such a network. No special hardware or software modificationsare necessary, especially no jail-breaking of the smartphones.

Bluemergency: Mediating Post-disaster Communication Systems using the Internet of Things and Bluetooth Mesh