Passive Wake-up Scheme for Wireless Sensor Networks

Abstract

In resource limited mobile computing devices (wireless sensor networks), energy saving is a critical design task. However, existing wake-up mechanisms encounter a critical trade-off between energy consumption and response time.In this paper, we propose a passive RF wake up (PRFW) scheme instead of time-based scheme to wake up node that indeed needs to wake up. The PRFW scheme is enabled by a PRFW hardware module sensing radio signal from other nodes. Analysis of energy consumption and delay shows that the power saving capability and wake-up delay can be improved by using the PRFW scheme.

A Chaos-Based Data Gathering Scheme Using Chaotic Oscillator Networks

“…Hence, longterm observation to target area is possible. As a hardware module, a passive wake up scheme for wireless sensor networks has also been proposed (Liang et al, 2008). In the conventional synchronization-based data gathering scheme, it is assumed that wireless sensor nodes do not have any complex routing tables; they transmit and receive sensing data by only referring values of hop counts to the nearest sink node.…”

ZeroMAC: Toward a zero sleep delay and zero idle listening media access control protocol with ultralow power radio frequency wakeup sensor

“…Radio wave sensors can be implemented with only a subset of components from the RF module. However, since the existing designs 10,11 exclude any form of amplifiers, it is difficult to detect signals weaker than the minimum signal strength required for passing through a silicon diode. Therefore, the sensing ranges of the existing radio wave sensor designs are much shorter than that of the underlying RF module.…”

“…A few studies 10,11 have investigated the design of a radio wave sensor, which is a small RF circuit, separated from the underlying RF module, to detect only the presence of RF signal. By separating channel monitoring from packet communications, a node with a radio wave sensor can eliminate the periodic wakeup of its RF module.…”

Radio-Triggered Power Management in Wireless Sensor Networks

“…The node keeps sleeping unless the receiver wakes it up after receiving the wake-up signal. For example, Atmel's ATA5283 is an ideal chip to do this work [7]. The newly proposed PicoRadio has such function too [10].…”

“…The disadvantage of this scheme is that it can not ensure that the node stays in the running mode when needed, meanwhile, the periodically wake up operation consumes excessive energy, which makes the scheme a high power consumption method. Another method is to use a low power stand-alone radio receiver subsystem to monitor the environment [7,10]. The node keeps sleeping unless the receiver wakes it up after receiving the wake-up signal.…”