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Proxy-Assisted Scheduling for Energy-Efficient Multimedia Streaming over Wireless LAN

IFIP Lecture Notes in Computer Science (LNCS)
Publication Date
  • Communication
  • Computer Science


Energy is a critical resource for battery-driven mobile and wireless devices. The power-saving mode (PSM) provided by the 802.11 standard is not adequate for mobile clients running streaming media applications. We propose new power-aware scheduling strategies that enhance existing traffic shaping schemes for the purpose of minimizing the communication energy consumption of mobile clients. Scheduling decisions are made by the local proxy and executed at the access point. We consider two cases. In the first case, the proxy is unaware of the power characteristics of the clients. We present an optimal scheduling scheme that minimizes the time that mobile clients stay in high-power modes. This scheme achieves significant energy savings compared to using traffic shaping alone. In the second case, the power profiles and the residual battery capacities of the clients are taken into account in generating the schedule. Unlike most existing work, we believe these factors should be considered in the performance metric. We propose a dynamic programming approach that computes the optimal transmission schedule based on the new metric. We also present an efficient heuristic which exhibits near-optimal performance in the simulation experiments.Full Text at Springer, may require registration or fee

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