Wireless sensor/actuator networks (WSANs) are emerging rapidly as a newgeneration of sensor networks. Despite intensive research in wireless sensornetworks (WSNs), limited work has been found in the open literature in thefield of WSANs. In particular, quality-of-service (QoS) management in WSANsremains an important issue yet to be investigated. As an attempt in thisdirection, this paper develops a fuzzy logic control based QoS management(FLC-QM) scheme for WSANs with constrained resources and in dynamic andunpredictable environments. Taking advantage of the feedback controltechnology, this scheme deals with the impact of unpredictable changes intraffic load on the QoS of WSANs. It utilizes a fuzzy logic controller insideeach source sensor node to adapt sampling period to the deadline miss ratioassociated with data transmission from the sensor to the actuator. The deadlinemiss ratio is maintained at a pre-determined desired level so that the requiredQoS can be achieved. The FLC-QM has the advantages of generality, scalability,and simplicity. Simulation results show that the FLC-QM can provide WSANs withQoS support.
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