Designing wireless streaming multimedia applications is a challenging task that involves the exploration of multiple parameters subject to real-time constraints. In particular, battery-powered multimedia appliances must provide a target quality of service (QoS) level within a limited energy and resource budget. In this work we address the problem of reducing the power consumption of the network interface card (NIC) when accessing a streaming video from a mobile client. We explore the opportunities for power reduction offered by traffic reshaping performed at both MAC-level and application-level. At MAC level, we exploit the degrees of freedom offered by the IEEE 802.11b power management. At application level we propose a new client-driven DPM policy. The proposed approaches have been validated using both real-world measurements, performed on instrumented fully-operational equipments, and accurate power simulations, performed using ad-hoc simulation models built on top of MathWorks' Simulink. Simulation models were characterized and validated against real-world measurements, and used to explore design choices not-yet supported by the commercial implementations of the IEEE 802.11b protocol. Experimental results show that the proposed approach allows us to save more than 60% of the energy consumption of the wireless NIC without any performance penalty.

Dynamic Power Management of Streaming Applications over a Wireless LAN

LATTANZI, EMANUELE;BOGLIOLO, ALESSANDRO
2003

Abstract

Designing wireless streaming multimedia applications is a challenging task that involves the exploration of multiple parameters subject to real-time constraints. In particular, battery-powered multimedia appliances must provide a target quality of service (QoS) level within a limited energy and resource budget. In this work we address the problem of reducing the power consumption of the network interface card (NIC) when accessing a streaming video from a mobile client. We explore the opportunities for power reduction offered by traffic reshaping performed at both MAC-level and application-level. At MAC level, we exploit the degrees of freedom offered by the IEEE 802.11b power management. At application level we propose a new client-driven DPM policy. The proposed approaches have been validated using both real-world measurements, performed on instrumented fully-operational equipments, and accurate power simulations, performed using ad-hoc simulation models built on top of MathWorks' Simulink. Simulation models were characterized and validated against real-world measurements, and used to explore design choices not-yet supported by the commercial implementations of the IEEE 802.11b protocol. Experimental results show that the proposed approach allows us to save more than 60% of the energy consumption of the wireless NIC without any performance penalty.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11576/1879281
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