Fault-Tolerant Identification in Wireless Sensor Networks for Maximizing System Lifetime Middela Shailaja, Department of CSE, SR Engineering College, Warangal, India. Email: [email protected]AnandaRaj S.P, Department of CSE, SR Engineering College, Warangal, India. Email: [email protected]Poornima.S, Department of IT, SR Engineering College, Warangal, India. Email: [email protected]Abstract Wireless Sensor Network (WSN) is used by many applications such as security, command and control and surveillance monitoring. In all such applications, the main application of WSN is sensing data and retrieval of data. There are many WSN systems that are query based. They give responses in a stipulated time based on the user’s query word. However, the WSN has possible sensor faults for it is not reliable and thus the network energy level goes down. It results in reduction of lifetime of network. To overcome the fault tolerance mechanisms can be used to improve reliability of the finding failure nodes and recovered by cluster heads. This paper presents an algorithm that can effectively increase lifetime of WSN besides satisfying the QoS requirements of application. Such algorithm is adaptive and also fault – tolerant. It uses path and source redundancy and based on hop-by-hop data delivery. Empirical simulation results revealed that the proposed system is feasible. This system also proposed the authentication of all kinds of identified faults and provides the services in quality manner. It increases the data flow and reduces the faults. Index Terms—WSN, QoS, query processing, energy efficiency, network life time, fault tolerant, data aggregation, data flow. 1. INTRODUCTION Of late Wireless Sensor Networks (WSNs) became popular for many applications such as industrial space, military and security. Mostly they are used in surveillance monitoring and security applications. The WSN is of two types basically. They are known as query based WSN and source-driven WSN. Data flow in WSN is the basis for the classification. In the former data transmission is initialized by sensor while in the latter, the data transmission is the result of user query. Strict QoS requirements are associated with user-based WSN and also expect best conservation of energy. User query is targeted to select sensor only. Query processing with completely satisfying QoS requirements is a challenging problem. Recently it has been addressed mostly in [2], [5], [1], and [6]. The solution is generally applying redundancy. In this paper we are interested in applying redundancy not only for satisfying QoS requirements but also timeliness and reliability requirements in case of query based WSN. The proposed system also aims at increasing lifetime of network besides satisfying QoS requirements by using optimal redundancy level. In order to achieve this, we use both path and source level redundancy. The algorithm proposed by is known as AFTQC (Adaptive fault Tolerant QoS Control). It is meant for achieving QoS requirements and also ensuring conservation of energy in WSN. 2. RELATED WORK The research work on WSN for achieving QoS requirements by applying redundancy is divided into three categories. They are known as reliability assurance QoS, application specific QoS [2], and end to end QoS. End to end QoS requirements implementation is not feasible due to the nature of WSN and its complexity. SAR (Sequential Assignment Routing) [5] is the kind of WSN that uses path redundancy and ensures increase in lifetime of network and also meeting QoS requirements. However, reliability issue is not considered by the algorithm. To overcome this problem ESRT [11] was proposed. And to address end-to-end reliability issues ReInFor.M is proposed [1]. The algorithm has different allocation strategy of network resources and also aware of adaptability to channel errors. Multiple copies of a packet are sent by the protocol to multiple paths to ensure reliable delivery of packet. It makes use of dynamic concept to find required paths and number of copies of the packet. With high probability, the number of edge-disjoint paths between nodes equal to average node degree is observed by protocol. The protocol uses thin band and its disjoint paths. M. Perillo et al. presented an approach which maximizes network lifetime while achieving minimum reliability. It is achieved by using both concepts such as finding paths and scheduling active sensor sets. The time used by all sensors sets is calculated as life time of WSN.
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Fault-Tolerant Identification in Wireless Sensor Networks for
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Fault-Tolerant Identification in Wireless Sensor Networks for Maximizing