Neighbor Adjacency based Hole Detection Protocol for Wireless Sensor Networks

AbstractCoverage and communication holes may appear in sensor networks due to limited battery life, presence of obstacles and physical destruction of nodes. These holes have a negative impact on the network performance. In order to ensure that optimum area in sensing field is covered by sensors, coverage holes must be detected. This paper proposes an adaptive routing algorithm based on neighbor adjacency for detecting coverage holes in sensor networks. Proposed algorithm can compute location of holes in the network from remote locations based on hop count measure computed from network statistics. Simulation results show that algorithm gives better performance in terms of end to end delay and packet delivery fraction as compared to previous works. Simplicity and efficiency are the key features that distinguish this work from existing routing and hole detection schemes

Efficient Algorithms for Distributed Detection of Holes and Boundaries in Wireless Networks

We propose two novel algorithms for distributed and location-free boundary recognition in wireless sensor networks. Both approaches enable a node to decide autonomously whether it is a boundary node, based solely on connectivity information of a small neighborhood. This makes our algorithms highly applicable for dynamic networks where nodes can move or become inoperative. We compare our algorithms qualitatively and quantitatively with several previous approaches. In extensive simulations, we consider various models and scenarios. Although our algorithms use less information than most other approaches, they produce significantly better results. They are very robust against variations in node degree and do not rely on simplified assumptions of the communication model. Moreover, they are much easier to implement on real sensor nodes than most existing approaches.Comment: extended version of accepted submission to SEA 201

BOUNDARY DETECTION ALGORITHMS IN WIRELESS SENSOR NETWORKS: A SURVEY

Wireless sensor networks (WSNs) comprise a large number of sensor nodes, which are spread out within a region and communicate using wireless links. In some WSN applications, recognizing boundary nodes is important for topology discovery, geographic routing and tracking. In this paper, we study the problem of recognizing the boundary nodes of a WSN. We firstly identify the factors that influence the design of algorithms for boundary detection. Then, we classify the existing work in boundary detection, which is vital for target tracking to detect when the targets enter or leave the sensor field