A priority based method for congestion control in Wireless Multimedia Sensor Networks

Wireless Multimedia Sensor Networks (WMSNS) are composed of a number of sensors which usually the most important data generated by them are video data. According to massive amounts of data, congestion control is essential for quality preservation of the video data. Quality of video data depends on low latency and high reliability. In this paper, an approach for congestion control is proposed. In the proposed scheme, the network area is divided into zones, and a mobile local sink is utilized in each zone which will lead to the network minimum latency. Also, to raise the quality of video data, the proposed method considers different levels of the buffer queue for each data type ( video, sound, and scalar). Moreover, to improve the video data quality at each mobile sink, a unique identifier for each event is considered. The mobile sink in each zone, receives the event packets in the separate queue of the related identifier. Simulation results shows that the proposed method results in saving of more amount of energy and thus increasing the network lifetime, while the packet loss reaches to zero.