Beneyaz A. Begum
ABSTRACT
In this paper we present a new fault-tolerant approach that establishes alternate path to the root node in a hierarchical aggregation tree in the event of intermediary node/link failures in WSNs. The Component-based Self-healing approach introduced in the paper exploits the inherent redundancy of WSN, to reconnect the nodes affected by a faulty parent back to the root component without using any redundant or backup parent nodes. The component approach is borrowed from graph theory to establish a connected path to the root. Based on this approach, two algorithms are developed (i) Self-healing Component-based Reconfiguration (SCR) and SCR-Dynamic Transmission Range Adjustment (SCR-DTRA). The SCR algorithm performs admirably well compared to two existing approaches in literature. However, depending on the location of nodes deployed, there could still be few estranged nodes that fail to get connected to root component. The SCR-DTRA algorithm counters this by dynamically adjusting the transmission range of estranged node so as to ensure its connectivity to the root component, without compromising the precedence relations. The results of simulations show that SCR-DTRA succeeds in connecting all affected nodes to root component, unlike most other approaches. The paper presents the algorithms, results of simulation and validation studies carried out on both algorithms.
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Index Terms
- Component-based Self-Healing Algorithm with Dynamic Range Allocation for Fault-Tolerance in WSN
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