A Grid-Based Approach to Prolong Lifetime of WSNs Using Fuzzy Logic

Abstract

Wireless sensor networks (WSNs) are autonomous, self-configured and consist of distributed sensors for monitoring any physical or environmental conditions. Sensor nodes cooperatively disseminate their data through the network to a base station. In recent years, such networks have shown its wide applicability in various areas. Generally, sensor nodes are small, cost-effective, memory constrained and having limited processing capabilities for sensing data in any particular region from the environment. Energy is one of the significant factors in such network. Whole network lifetime depends on how efficiently consumption of energy takes place. Sensor nodes are combined into groups which is called cluster. The purpose of clustering approach is to make the consumption of energy in more effective way. A cluster head node is used for collecting sensed data from cluster nodes for transmitting to the base station. An efficient election of cluster head minimizes energy consumption, thereby increasing network lifetime. One major drawback in dynamic clustering approach is that in every round, cluster head selection is done locally and decides the cluster region. This process has extra communication cost in massage exchange to select the appropriate cluster head. Transmission of message from one node to another node consumes energy that leads to inefficient use of energy resource. In this paper, a non-probabilistic grid-based approach to prolong the WSNs lifetime using fuzzy logic has been proposed. In this, whole network is divided into predefined grid area and selecting a node as grid head (GH) using two fuzzy variables, viz., base station distance and residual energy of sensor nodes. This approach uses a multi-hop communication approach. GH nodes are authorized to communicate with other GH nodes and base station. Simulation results show that the proposed approach prolongs WSNs network lifetime than existing ones.