Dynamic power management in wireless sensor networks
Sinha, A.; Chandrakasan, A.
Design & Test of Computers, IEEE
Volume 18, Issue 2, Mar/Apr 2001 Page(s):62 - 74
Digital Object Identifier 10.1109/54.914626
Summary:We propose an OS-directed power management technique to improve
the energy efficiency of sensor nodes. Dynamic power management (DPM) is
an effective tool in reducing system power consumption without
significantly degrading performance. The basic idea is to shut down
devices when not needed and wake them up when necessary. DPM, in
general, is not a trivial problem. If the energy and performance
overheads in sleep-state transition were negligible, then a simple
greedy algorithm that makes the system enter the deepest sleep state
when idling would be perfect. However, in reality, sleep-state
transitioning has the overhead of storing processor state and turning
off power. Waking up also takes a finite amount of time. Therefore,
implementing the correct policy for sleep-state transitioning is
critical for DPM success. It is argued that power-aware methodology uses
an embedded microoperating system to reduce node energy consumption by
exploiting both sleep state and active power management
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