International Journal of Computer Applications (0975 – 8887) Volume 124 – No.11, August 2015 5 Performance Evaluation of AODV and DSDV Routing Protocols over Zigbee Network for Different Topologies under CBR Traffic Pattern Smriti Maurya M.E. Scholar, CSE Dept. M.B.M. Engineering College, J.N.V. University, Jodhpur N.C. Barwar, PhD Assoc. Professor, CSE Dept. M.B.M. Engineering College, J.N.V. University, Jodhpur ABSTRACT Zigbee is an open specification developed by Zigbee Alliance build on the top of IEEE802.15.4 Physical and Media Access Control layer standard, which is one of the global wireless standards of communication protocol for Low-Rate Wireless Personal Area Networks (LR-WPAN). It aims at low power consumption, low data rate, low cost, short range and flexible, reliable, scalable wireless communication. This paper presents overview of IEEE 802.15.4/Zigbee and analyze the performance of AODV and DSDV routing protocols over Zigbee network for different topologies like Random, Star and Peer to Peer (Mesh) under CBR traffic pattern by varying number of nodes, number of sources and range. Performance analysis is carried out using various parameters like Average End-to-End delay, Average Throughput and Packet delivery ratio to determine the Quality of Services (QoS) of the network under different scenarios using NS2 simulator (Version 2.35). Awk scripts are used for analyzing the simulation results and results are shown in graphical forms. General Terms IEEE802.15.4/Zigbee Lower rate wireless personal area network Keywords Zigbee, AODV, DSDV, CBR 1. INTRODUCTION With the rapid growth of mobile computing devices the demand for short range wireless standards for portable and flexible connectivity are increasing day by day. Therefore, IEEE802.15 working group was formed in January 1999 to create Wireless Personal Area Network (WPAN) standard, intended to focus on low-cost, low power, small network and short range. The idea was to create standards that allow devices to communicate and collaborate with one another and to accommodate wider adoption and applicability. Zigbee is an open specification for Lower rate wireless personal area network introduced by Zigbee Alliance in 2003. IEEE and ZigBee alliance have joined hands to develop a complete specification of protocol stack for IEEE802.15.4. Zigbee is built on the top of IEEE802.15.4 standard where IEEE802.15.4 standard focuses on the specification of the lower two layers (physical and data link layer) that supports for low data rate, low power consumption and low cost and ZigBee works on upper layers of the protocol stack (network, and application layer) that enables interoperable data networking and security services. Normally, ZigBee works in the license-free 2.4GHz ISM band with a data rate of 250Kbps and the transmission distance ranges from 10 to 75 meters, which makes this technology easily applicable and worldwide available. In LR-WPAN, a device can be assigned either a 16 bit short or a 64 bit extended address during association. Hence, a single network could potentially accommodate 65,536 (2 16 ) devices. It is anticipated to enable various short range applications in the fields of home networking, home/office automation, automotive networks, industrial networks, hotels, hospitals, interactive toys and remote metering and many more [6]. Before the implementation of real time applications, extensive performance evaluation of the standard is necessary especially when critical issue like QoS is of concern. The knowledge of traffic patterns is also essential for optimizing the performance because the uneven distribution make traffic heterogeneous in nature and it will affects the QoS. So it’s a challenge to choose the optimal routing protocol that can be used with most usable data traffic pattern to enhance the QoS of network. In this paper an attempt is made to analyze the performance of AODV and DSDV routing protocols over IEEE802.15.4/Zigbee network for different topologies under CBR Traffic pattern with respect to the related work done by various researchers. The rest of the paper is organized as follows section II covers related work in this area. Section III provides a brief overview of the IEEE802.15.4/ Zigbee standard. Section IV describes various routing protocols and traffic patterns, in section V simulation environment is discussed, simulation results are analyzed in section VI and finally section VII gives conclusion of the paper. 2. RELATED WORK Several efforts on performance evaluations were conducted since the inception of IEEE802.15.4. The literature comprehensively defines the IEEE802.15.4 protocol as well as simulations on different traffic patterns and different topologies using AODV and DSDV routing protocols. Some of them are discussed below. J.Zheng and M.J.Lee [1] developed the IEEE 802.15.4 standard on the ns2 simulator and carry out several sets of experiments to study its various features. Prathamesh Ajgaonkar et al. [2] conduct AODV simulation with different traffic scenarios like FTP, CBR and Poisson, having different network topologies (Star and Peer to Peer on