Ad Hoc Network Case Study

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Chapter 1 Introduction 1.1 Introduction Wireless ad hoc networks are collection of wireless nodes that communicate directly over a common wireless channel. The nodes are equipped with wireless transceiver. They do not need any additional infrastructure such as base station or wireless access point. Therefore each node does not only play the role of an end station but also acts as a router that sends packets to desired nodes. Ad hoc networks have many applications. Two major applications are crisis management and military operations. Another application of ad hoc network is Bluetooth which is designed for personal use and enables printers, scanners, mobile phones and music player to be connected wireless to a personal network that creates flexibility…show more content…
Rapidly deployable and self configuring . No need for existing infrastructure . Wireless links . Data must be routed via intermediate nodes . Scalability incorporates the addition of more nodes . Flexible Ad Hoc network can be temporarily set up at any time in any place . Lower getting started costs due to decentralized administration 1 . The nodes in ad hoc network need to rely on any hardware and software. So, it can be connected and communicated quickly . A MANET can be standalone network or it can be connected to external networks Why Ad Hoc network? . Setting up of fixed access point and backbone infrastructure is not always viable . Infrastructure may not be practical for short range radios . Are easy to deploy 1.3 Minimum hardware requirements . Pentium IV base PC . 512 MB RAM . Super VGA monitor .…show more content…
[6] has proposed that ad hoc network is a self organizing single hop or multi hop systems of wireless nodes which can communicate with each other without preexisting infrastructure. A lot of research has been conducted in this field and two types of topology structure have been proposed one is flat topology structure and other is hierarchical clustering structure. The peer to peer flat structure results in a complicated topology in large ad hoc networks and an unstable topology in mobile ad hoc networks because the movement of the one node may change the whole topology of the network. Therefore flat topology structure is inefficient for ad hoc network. Researchers then proposed hierarchical clustering structure for ad hoc network. With an ad hoc clustering network the nodes are separated into groups called clusters. There are usually three types of nodes in clustering network cluster head, gateway nodes and normal nodes. In each cluster one node is elected as a cluster head to a local controller. The size of the cluster depends on the transmission range of the nodes in single hop cluster and the number of hops made by the cluster in multi hop clusters. The normal node sends or relays data to the CH which transfer the collected packet to the next hop. The gateway node belonging to more than one cluster bridges the CHs in those clusters. Both CHs and gateway nodes from the backbone network yet the presence of gateway node is not compulsory in the clustering
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