Abstract
With the vigorous evolution of the Internet of things (IoT) technologies, the IoT applications blossom everywhere. Notably, the rapidly aging society has heated up the interests in the field of wearable health monitoring. However, wearable devices commonly share the unlicensed Industrial Scientific Medical (ISM) band with a powerful and wide-ranging communication technology (i.e., WiFi). Drowned by cross-technology interference (CTI) therefrom, the data transmissions of wearable devices could be deeply undermined, while the value of data in healthcare is built on its timeliness, continuity, and reliability. To deal with this challenge, we present a cross-technology coordination mechanism in the paper, namely CT-CooM which enables wearable devices to request a collective backoff of neighboring WiFi devices during data transmissions of these wearable devices. We implement CT-CooM on a software-defined WiFi device and commodity ZigBee devices. Evaluation results illustrate that CT-CooM can effectively reduce the interference on ZigBee from WiFi and push the packet loss rate down to as far as 35%.
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