Abstract
WSNs are complex systems that are mainly limited by the battery life of the nodes in order to have an adequate performance. During the operation of the system, it is not uncommon to have a portion of nodes with low energy levels while other nodes have high energy levels. Nodes with very low residual energy must reduce their energy consumption since their operational lifetime is almost over. In this paper, we consider cluster-based WSNs for the event detection where there is a high concentration of high energy nodes and low concentration of low energy nodes. Building on this, we propose extending the battery life of low energy nodes in both the cluster formation and the steady-state phases. For the former, energy efficiency is achieved by means of assigning prioritized access to the shared channel to low energy nodes while delaying the contention access of high energy nodes which can support higher number of collisions before energy depletion. For the latter, we consider the duty-cycle of nodes where the sleep and active modes have dwelling times related to their residual energy levels. The system and the impact of the proposed residual energy-based mechanisms are mathematically evaluated using Markovian models.
Highlights
Wireless sensor networks (WSNs) can be designed for either continuous monitoring (CntM) [1, 2] or event-detection driven (EDD) applications [3, 4]
There is no impact of the ON/OFF scheme used in the steady-state phase
We compare the results produced by the residual energy-based scheme to the conventional system, that is, the system where a fixed value of the transmission probability is used throughout the cluster formation phase
Summary
Wireless sensor networks (WSNs) can be designed for either continuous monitoring (CntM) [1, 2] or event-detection driven (EDD) applications [3, 4]. EDD WSNs are deployed over a target area to supervise certain phenomena of interest. Each node takes readings from the local environment and processes and transmits the sensed data to the sink node. In this type of WSNs, communications are only triggered by the occurrence of a prespecified type of events. As opposed to EDD applications, CntM WSNs are deployed in order to examine the evolution of certain parameters, which are refreshed periodically at the sink node. CntM applications are well suited for cases when it is important to gather as much information as possible from the monitored phenomena in the area of interest while EDD is preferred when relevant predetermined changes in the environment occur
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Journal of Distributed Sensor Networks
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
