RFID-based wake-up system for wireless sensor networks

Abstract

A critical issue of Wireless Sensor Networks circuits is energy management. This work presents a Radio-Triggered Wake-Up solution designed and developed for WSN based systems. The proposed circuit manages, in a simple and efficient way, node switching between sleep mode and both receiving or transmitting active modes. It uses a HW hearing circuit, which lowers power consumption and avoids extra processing on the main microcontroller. The weak-up is selective with predefined recognition patterns without the microcontroller intervention. Furthermore, it is tiny in size, and the whole circuit is suitable for single CMOS chip integration. The circuit has been tested to demonstrate the WakeUp proposal worthiness. With only 8.7 microwatts of power consumption (@ 3.0 Vdc) the system successfully Wake-Up nodes up to 15 meters away from the transmission source. This performance improves solutions presented in previous research works.

RFID Based Acoustic Wake-Up System for Underwater Sensor Networks

“…Attending to the order of magnitude of the power consumption of the ITACA modem, a feasible wake-up system would meet the requirements presented in other works related to terrestrial WSN [2]:…”

“…Use of existing detectors, although they were originally designed for other frequency bands and applications, have reported the best results in terms of both power consumption and wake-up detection distance [2].…”

“…In [2], a RT-WUp solution is presented. It is based on an existing commercial IC originally commercialized to RFID applications.…”

“…State-of-the-art on terrestrial RT-WUp systems best solutions are based on superheterodyne structures [2]. Incoming signals are shifted to a lower Intermediate Frequency (IF).…”

Range extension of passive wake-up radio systems through energy harvesting

“…Some innovative ideas are proposed for active wake-up radio designs to reduce the energy consumption as low as possible. Sanchezet et al proposed an RFID-based wake-up radio for wireless sensor networks [5]. The circuit they proposed can reach a wake-up range of 49.2f t. However, the circuit is an active circuit with 8.7µW energy consumption in waiting mode [6], and 20.7µW during the wake-up signal processing mode.…”