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Motivated by the emerging delay-sensitive applications of the Internet ofThings (IoT), there has been a resurgence of interest in developing mediumaccess control (MAC) protocols in a time-slotted framework. Theresource-constrained, ad-hoc nature of wireless networks typical of the IoTalso forces the amount of control information exchanged across the network --required to make scheduling decisions -- to a minimum. In a previous article weproposed a protocol called QZMAC that (i) provides provably low mean delay,(ii) has distributed control (i.e., there is no central scheduler), and (iii)does not require explicit exchange of state information or control signals. Inthe present article, we implement and demonstrate the performance of QZMAC on atest bed consisting of CC2420 based Crossbow telosB motes, running the 6TiSCHcommunication stack on the Contiki operating system over the 2.4GHz ISM band.QZMAC achieves its near-optimal delay performance using a clever combination ofpolling and contention modes. We demonstrate the polling and the contentionmodes of QZMAC separately. We use an Adaptive Synchronization Technique in ourimplementation which we also demonstrate. Our network shows good delayperformance even in the presence of heavy interference from ambient WiFinetworks.

Implementing QZMAC (a Decentralized Delay Optimal MAC) over 6TiSCH under the Contiki OS in an IEEE 802.15.4 Network