Priority Scheduling for Improving Video Delivery over Wireless Multimedia Sensor Networks

Using multipath routing protocols results in more efficient data transmission than single path routing protocols in Wireless Multimedia Sensor Networks (WMSNs). In this paper, we propose a new mechanism for improving video transmission over WMSN based on packet, path and queue priority scheduling over multipath routing protocol. We assume that network has high CBR (Constant Bit Rate) traffic with no video data in addition to video packets. Since, not every frame has the same effect on receptive video quality, in our mechanism we put priority over the video packets regarding their effects on the receiver video distortions. In our scheduling, condition of each routing path is studied, using control packets being transmitted periodically, and in the video source node the packets having high priority are transmitted over paths with better conditions. Also, intermediate nodes buffer (queue) is scheduled for quick and righteously transmission of video packets compared with the other packets in network. Simulation results show that our proposed scheduling improves important Quality-of-Service (QoS) metrics such as end-to-end delay and frame loss percentage for video streaming.