Integrated Intelligent Research (IIR) International Journal of Communication and Networking System Volume: 05, Issue: 01, June 2016, Pages:1 - 3 ISSN: 2278-2427 1 Reliability Evaluation on Wireless Sensor Network M.S.Nidhya 1 R.Chinnaiyan 2 1 Assistant Professor, Dept of Computer Science, Hindustan College of Arts & Science,Padur, Chennai 2 Associate Professor, Dept of Computer Application, New Horizon College of Engineering, Bangalore, Karnataka Email: nidhyaphd@gmail.com, Vijaychins@gmail.com Abstract - Reliability on Wireless Sensor Network (WSN) will provide fault tolerant network and find out the failures which are occurred at various levels. The main task of sensor is to monitor the area, by collecting the data and transmit the data to sink node. Fault occurred in sensors due to low cost and limited energy. Reliability requirements and drawbacks are depends on the resources utilized by the WSN. Routing protocols are used to transfers data to the sink node from sensors without error and to provide reliability against sinkhole and node clone attack. In this paper we study the reliability enhancement by routing protocols to transfer a data, a hardware spare that replaces sensors when failed and modeling reliability in WSN and compare the performance also. Keywords - Wireless Sensor Networks, Reliability, Routing, Fault tolerance. I. INTRODUCTION A wireless sensor network is a collection of large number of sensor nodes scattered over the region or inside the target which is to be detected, monitored or tracked. Each sensor node consists of processing capability, memory, Radio Frequency transceivers, a power source, and various motors for moving or controlling a system [1].Wireless sensors are used in various fields including environmental medical, military, transportation, entertainment and smart spaces [2]. To collect the data efficiently sensors require reliable network without loss of data from the nodes. Sensors have a direct contact with environment. While sensing, processing or reporting the data to the sink, errors introduced in some of the sensor measurement. So in order to improve data integrity and detection reliability [3], the faulty sensor’s data have to be detected and filtered out, while data without fault are aggregated and sent. Even when the object or event is reliably detected, error occurred due to poor quality communication link. Network based reliability can be improved by selecting a suitable routing protocol. Also even if the devices and links are working properly, sometimes the target or sink node may not get detected due to limited coverage and connectivity and inefficient placement of sensors. The objective of this paper is to evaluate reliability in routing protocols when a data will be send by sensors, and find the hardware support for reliability and modeling reliability. II. LITERATURE REVIEW In this paper we surveyed reliability on Wireless Sensor etwork on the basis of three criteria:  Reliability provided by the routing protocol.  Hardware support on reliability(Spare)  Reliability Modeling A. Routing protocols proposed for Reliability (Fault occurred in link and sensors) Jianlin, koichi Ishibashi 2014[4] proposed reliable routing protocol(RRP) in large scale wireless sensor network. RRP discovers multiple bidirectional routes between sensors and sink node. To guarantee the complete routing topology buildup sink node initiates route construction with an imaginary node as destination. It achieves load balance by sending data packets via route with lighter workload. It can be optimized for lightweight routing. Ning Cao, Rusell Higgs Grecory 2014[5] proposed Nearest Closer protocol for WSN. The main idea of this paper is distance between the receiver sensor node and the sink node is shorter than distance between the transmitter sensor and the sink node. To implement this each node has to know its own position, its neighbor position within its transmission range and position of sink node. Then they investigated the relationship among density, lifetime and reliability. Based on the result they introduced parameters for tracking application in sensor network. Ghufran Ullah,Abdul Hanan 2014[6] proposed an Efficient Delay aware routing protocol(EDARP) it enhances the quality of service parameters to satisfy the end to end delay and reliability requirements to real time WSN applications. EDARP is compared with several protocols and result shows that EDARP has got better performance in terms of end to end delay and reliability. This protocol is suitable for smaller number of hops. Bejoy.B.J, Dr.B.Paramasivan 2012[7] proposed transport protocol for WSN. Clusters are formed to minimizing energy dissipation. The node has to maintain the neighbor list to forward data and any changes in local topology can cause a node to update its neighbor list. If a node notices that its neighbor list has changed. It can suddenly re- advertise all of its data. Therefore it provides reliable transport in mobility condition. Yuping Zhou, Zhenjie Huang, Juan Wang 2014[8] proposed a Global deterministic linear propagation verification protocol (GDL). This protocol detects node clone attack in WSN. Location information of the node is propagated and stored along horizontal and vertical direction. Extension of GDL scheme is randomized parallel multiple cells linear propagation verification protocol. Omid Naderi, Mahdi Shahedi 2014[9] estimates area in the network where a sink hole attack has occurred there by considering an energy consumption model in network. They apply trust based routing for providing a high quality of security by selection based on packet trust requirement. So the routing protocol classifies the traffic packet according to their requested security and the routes the packet related to each class through the path that fulfills the security requirements of them. Amir Ehsani Zonouz, Vinod M. Vokkarane, 2014[10] modeled the reliability of two different types of sensor nodes: Energy