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BUFFERING APPROACH FOR ENERGY SAVING IN VIDEO SENSORS Wanghong Yuan, Klara Nahrstedt
 

Summary: BUFFERING APPROACH FOR ENERGY SAVING IN VIDEO SENSORS
Wanghong Yuan, Klara Nahrstedt
Department of Computer Science
University of Illinois at Urbana-Champaign
wyuan1, klara @cs.uiuc.edu
ABSTRACT
Networked video sensors need to execute two dependent
periodic tasks: video encoding and transmission. The de-
pendency and periodicity often result in small idle inter-
vals of CPU and wireless network interface card (WNIC).
In this paper, we present a sender-buffering approach to ex-
ploit such idle intervals for energy saving. Specifically, a
video sensor encodes frames in a timely fashion, but buffers
encoded frames and transmits them in bursts at longer in-
tervals. In doing so, it (1) accumulates short WNIC idle in-
tervals into longer ones, during which the WNIC can enter
the lower-power sleep mode, and (2) slows down the CPU
by avoiding CPU idle intervals, which are resulted from
both early completion of frame encoding and waiting for
frame transmission. Our experimental results show that the

  

Source: Adve, Sarita - Department of Computer Science, University of Illinois at Urbana-Champaign

 

Collections: Computer Technologies and Information Sciences