RadioTrigger.JRTS.10 - Radio-Triggered Wake-Up for Wireless...

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Unformatted text preview: Radio-Triggered Wake-Up for Wireless Sensor Networks Lin Gu and John A. Stankovic Department of Computer Science, University of Virginia lingu, stankovic Abstract Power management is an important technique to prolong the lifespan of sensor networks. Many power management protocols employ wake-up/sleep schedules, which are often complicated and inefficient. We present power management schemes that eliminate such wake-up periods unless the node indeed needs to wake up. This type of wake-up capability is enabled by a new radio-triggered hardware component inspired by the observation that the wake-up radio signal contains enough energy to trigger a wake-up process. We evaluate the potential power saving in terms of the lifes- pan of a sensor network application, using experiment data and SPICE circuit simulations. Comparing the result with always-on and rotation-based power management schemes, we find the radio-triggered scheme saves 98% of the energy used in the always-on scheme, and saves over 70% of the en- ergy used in the rotation-based scheme. Consequently, the lifespan increases from 3.3 days (always-on) or 49.5 days (rotation-based) to 178 days (radio-triggered). Furthermore, a store-energy technique can extend operating distance from 10 feet to 22 feet, or even longer if longer latency is accept- able. Wake-up efficiency is evaluated in NS-2 simulations, which show that radio-triggered wake-up has fewer failures, shorter latency, and consistently larger sensing laxity than rotation based wake-up. We also present amplification and radio-triggered IDs which can further enhance performance. 1. Introduction A sensor network is comprised of a number of low-power devices with sensing and computing capability. In many sen- sor network systems, the power supply for the network nodes is usually a depletable power source, such as batteries. To in- crease the lifespan of sensor networks, researchers have de- signed a number of power management schemes. Many power management schemes take advantage of the energy saving features of sensor network hardware. For ex- ample, the ATmega128 processor, which is designed for em- bedded systems and is used in the Berkeley Mica2 mote, has six working modes with different energy saving features [12] [1]. In one of the working modes, the processor shuts down all the hardware components except for the memory, a timer, and the interrupt handler, hence energy consumption reduces to less than of the active working mode. Power management schemes need to control when a net- work node should enter a high-power running mode and when to enter a low-power sleep mode. The high-power to low-power transition can usually be done with a set of in- structions that shuts down hardware components, and the power management scheme may perform this action when certain conditions hold, e.g., there are no events in the sys- tem for a long time. The low-power to high-power transi- tion is, however, a tricky problem because the network node...
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This note was uploaded on 01/27/2010 for the course EE 600 taught by Professor Aodafkdlja during the Spring '10 term at Aarhus Universitet.

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RadioTrigger.JRTS.10 - Radio-Triggered Wake-Up for Wireless...

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