Abstract
Industrial Wireless Sensor Networks (IWSNs) are mainly used for critical monitoring and control applications in industrial automation systems. The applications require realtime data delivery within strict delay constraints. Exceeding the required delay bound for emergency traffic could result in economic losses or even safety incidents. In this paper, we propose a Priority-enhanced slot Allocation Medium Access Control protocol (PriAlloc-MAC), which can guarantee the transmission of different traffic categories of IWSNs in given time constraints. In this protocol, the nodes with emergency traffic are allowed to preempt slots to reduce the channel access delay. Multiple nodes with emergency traffic access the channel without conflicts according to their access sequence numbers (ASNs). In addition, the protocol utilizes a short time slot design and allocates a different number of time slots to each node according to the length of the data packet to be transmitted to improve channel utilization. In this paper, the performance of PriAlloc-MAC is evaluated and compared with WirelessHART. Results show that PriAlloc-MAC is significantly better than WirelessHART in terms of traffic delay and channel utilization.
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