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A major challenge in wide deployment of smart wireless devices, usingdifferent technologies and sharing the same 2.4 GHz spectrum, is to achievecoexistence across multiple technologies. The IEEE~802.11 (WLAN) and the IEEE802.15.4e TSCH (WSN) where designed with different goals in mind and both playimportant roles for respective applications. However, they cause mutualinterference and degraded performance while operating in the same space. Toimprove this situation we propose an approach to enable a cooperative controlwhich type of network is transmitting at given time, frequency and place.  We recognize that TSCH based sensor network is expected to occupy only smallshare of time, and that the nodes are by design tightly synchronized. Wedevelop mechanism enabling over-the-air synchronization of the Wi-Fi network tothe TSCH based sensor network. Finally, we show that Wi-Fi network can avoidtransmitting in the "collision periods". We provide full design and showprototype implementation based on the Commercial off-the-shelf (COTS) devices.Our solution does not require changes in any of the standards.

Towards efficient coexistence of IEEE 802.15.4e TSCH and IEEE 802.11