Deterministic Scheduling for Energy Efficient and Reliable Communication in Heterogeneous Sensing Environments in Industrial Wireless Sensor Networks

Abstract

The present-day industries incorporate many applications, and complex processes, hence, a large number of sensors with dissimilar process deadlines and sensor update frequencies will be in place. This paper presents a scheduling algorithm, which takes into account the varying deadlines of the sensors connected to the cluster-head, and formulates a static schedule for Time Division Multiple Access (TDMA) based communication. The scheme uses IEEE802.15.4e superframe as a baseline and proposes a new superframe structure. For evaluation purposes the update frequencies of different industrial processes are considered. The scheduling algorithm is evaluated under varying network loads by increasing the number of nodes affiliated to a cluster-head. The static schedule generated by the scheduling algorithm offers reduced energy consumption, improved reliability, efficient network load management and improved information to control bits ratio.

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“…A Time Division Multiple Access (TDMA) based transmission is established within the super-frame, where the maximum number of sensing devices affiliated to DS is n, and communication of each sensing device is completed in one timeslot of duration t [25]. Periodic communication schedule is established from the sensing devices to the DS, repeated in regular interval, TR [26,27]. In Figure 2, super-frame structure of the proposed system is presented.…”