RATE ALLOCATION FOR SVC TRANSMISSION IN ENERGY-CONSTRAINEDWIRELESS SENSOR NETWORKS

Due to the resource limitations, efficient multimedia transmission is still a challenging problem in WirelessSensor Networks (WSNs). To achieve this goal, provisioning the required rate and quality of video streamalong with limitations of sensor nodes should be considered. The Scalable Video Coding (SVC) is anefficient approach to support the graceful quality reduction and scalability of multimedia application thuswe adopt it to encode video streams. In this paper, both Network Utility Maximization (NUM) and utilityproportional optimization for scalable multimedia transmission in WSNs are addressed. Link congestionand energy scarcity of sensor nodes are considered as the constraints in optimization problems. To depictthe characteristics of these applications accurately, staircase utility function is adopted. The non-concavityof utility function leads to the non-convex problem. To deal with the non-convexity of the problem, anapproximation of the utility function is used. Finally, we propose two distributed algorithm to allocate theresources properly by solving NUM and utility proportional problems in energy-constraints WSNs. Thesimulation results in different scenarios show the efficiency and proper rate of convergence of ourproposed algorithms.