期刊名称：International Journal of Advanced Research In Computer Science and Software Engineering
印刷版ISSN：2277-6451
电子版ISSN：2277-128X
出版年度：2012
卷号：2
期号：7
出版社：S.S. Mishra
摘要：A wireless sensor network is an assortment of nodes structured into a cooperative network. It is a group of small sensor nodes and wireless communication capabilities. Each node consists of privilege capability may contain numerous types of memory have an RF transceiver, have a power source and accommodate various sensors. Wireless Sensor Networks (WSNs) consist of small nodes with sensing, computation, and wireless communications capabilities. Many routing, power management, and data dissemination protocols have been specifically designed for WSNs where energy awareness is an essential design issue [2]. Wireless Sensor Networks (WSN) is intended for monitoring an environment. The main task of a wireless sensor node is to sense and collect data from a definite domain, process them and convey it to the sink where the application lies. DSR has been implemented by numerous groups, and deployed on several test beds. Networks using the DSR protocol have been connected to the Internet. DSR can interoperate with Mobile IP, and nodes using Mobile IP and DSR have seamlessly migrated between WLANs, cellular data services, and DSR mobile ad hoc networks [1]. The Dynamic Source Routing (DSR) protocol is a source-routed on-demand protocol [1]. There are two major phases for the DSR routing protocol: route discovery and route maintenance. Route discovery allows any host in the ad hoc network to dynamically discover a route to any other host in the ad hoc network, whether directly reachable within wireless transmission range. A host initiating a route discovery broadcasts a route request packet which may be received by those hosts within wireless transmission range of it. The route request packet identifies the host, referred to as the target of the route discovery, for which the route is requested. If the route discovery is successful the initiating host receives a route reply packet listing a sequence of network hops through which it may reach the target . The main difference between DSR and other protocols is the routing information is contained in the packet header. Since the routing information is contained in the packet header then the intermediate nodes do not need to maintain routing information. An intermediate node may aspiration to record the routing information in its tables to improve recital but it is not mandatory. DSR also supports asymmetric links as a route reply can be piggybacked onto a new route request packet. DSR is suited for small to medium sized networks as its overhead can scale all the way down to zero. The overhead will increase significantly for networks with larger hop diameters as more routing information will be contained in the packet headers [3]. The study of wireless sensor networks is challenging in that it requires an enormous breadth of knowledge from an enormous variety of disciplines. The main focus of this paper is to discuss and evaluate the performance of different parameters in different scenarios and different terrain areas which may be small and large in wireless sensor network using Dynamic Source routing protocol (DSR) for monitoring of critical conditions with the help of parameter Packet delivery fraction (PDF), Average Throughput and Packet Loss. In this study investigators use a scenario for DSR routing protocol where a total of 100 nodes are used with the maximum connection number 10; seed for the one, and a hope that have 10 CBR; 4 packets per second transfer rate and the pause time is varying of 0.00 sec, 10sec, 20sec, 30sec, 40sec, and 50sec implemented respectively in a 100 m x 100 m and 1000 m x 1000 m terrain areas scope. The simulation time was taken to be of 50 seconds.
