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Supporting real-time communications over Wireless networks (WSNs) is a toughchallenge, due to packet collisions and the non-determinism of common channelaccess schemes like CSMA/CA. Real-time WSN communication is even moreproblematic in the general case of multi-hop mesh networks. For this reason,many real-time WSN solutions are limited to simple topologies, such as starnetworks. We propose a real-time multi-hop WSN MAC protocol built atop the IEEE802.15.4 physical layer. By relying on precise clock synchronization andconstructive interference-based flooding, the proposed MAC builds a centralizedTDMA schedule, supporting multi-hop mesh networks. The real-time multi-hopcommunication model is connection-oriented, sing guaranteed time slots, andenables point-to-point communications also with redundant paths. The protocolhas been implemented in simulation using OMNeT++, and the performance has beenverified in a real-world deployment using Wandstem WSN nodes.

TDMH-MAC: Real-time and multi-hop in the same wireless MAC