Energy Efficient Delay Avoidance in WSN
The evolution of wireless communications and embedded system had lead to a big acceptance of Wireless Sensor Networks (WSNs): network of few to hundreds of thousands of sensor nodes, often with low processing and energy capacities that are capable of physical measurements and ambient monitoring, like temperature, humidity and light. Considering their limited resources it becomes necessary to support mechanisms that ensure rational use of their resources. It is in this context that we examine routing protocols, and show how these can be energy conscious by avoiding nodes with less spare energy. In resource limited 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 wake up scheme instead of time-based scheme to wake up node that indeed needs to wake up. The TDMA scheme is enabled by a 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 wake up scheme.