Energy-Aware Traffic Shaping for Wireless Real-Time Applications

  • Authors:
  • Affiliations:
  • Venue:
  • RTAS '04 Proceedings of the 10th IEEE Real-Time and Embedded Technology and Applications Symposium
  • Year:
  • 2004

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Abstract

Sleep modes of wireless network cards are used to switchthese cards into low-power state when idle, but large time-outperiods and frequent wake-ups can reduce the utilityof this approach. Modern processors offer the ability toswitch CPU voltages or clock frequencies and therefore reduceCPU energy consumption, however, that can reducethe sleep durations of a network device, adversely affectingthe achievable energy savings. This paper describes an approachin which multiple resource managers cooperate toreduce a mobile device's energy consumption. This system-levelapproach is based on the integrated management ofa real-time CPU scheduler, the frequency scaling capabilitiesof a modern processor, a QoS packet scheduler, and thelow-power sleep mode of a wireless network card.