A Cluster-Based MAC Scheme for Multimedia Support in Wireless Sensor Networks

Based on the ideas of conflict-free transmission, priority-based service and dynamic load adaptation, this article proposes a scheduling strategy fit for the MAC scheme of WSNs, which has made possible the polling service capable of differentiating the clusters of different priority levels under two kinds of service policy. The scheme has improved the system's energy efficiency and the instantaneity of multimedia transmissions in wireless system via adjustment of the times of the gated services along with input load change. The theoretical model of this scheme is established through Markov chain and probability generating function. Mathematical analysis is made on the mean queue length and the mean inquiry cyclic time of the common nodes and the key node. It turns out that the findings from theoretical analysis correspond well with those from simulated experiments.