free thesis on manet-Mobile Ad Hoc Network
Mobile Ad Hoc Networking is a technology under development for the last 20 years principally through research funding sponsored by the U.S Government. It is somewhat synonymous with Mobile Packet Radio Networking (a term coined via during early military research in the 70’s and 80’s), Mobile Mesh Networking (a term that appeared in an article in The Economist regarding the structure of future military networks) and Mobile, Multihop, Wireless, Networking (perhaps the most accurate term, although a bit cumbersome). In the 1990s, the concept of commercial ad-hoc networks arrived with notebook computers and other viable communications equipment. At the same time, the idea of a collection of mobile nodes was proposed at several research conferences. The research 802.11 subcommittee had adopted the term “ad-hoc networks” and the research community had started to look into the possibility of deploying ad-hoc networks in other areas of application. Meanwhile, work was going on to advance the previously built ad-hoc networks. GloMo (Global Mobile Information Systems) and the NTDR (Near-term Digital Radio) are some of the results of these efforts. GloMo was designed to provide an office environment with Ethernet-type multimedia connectivity anywhere and anytime in handheld devices.
Later on in mid-1990s, within the Internet Engineering Task Force (IETF), the
Mobile Ad-Hoc Networking working group was formed to standardize routing
protocols for ad-hoc networks. The development of routing within the
working group and the larger community resulted in the invention of reactive
and proactive routing protocols.
Soon after, the research 802.11 subcommittee standardized a medium access protocol that was based on collision avoidance and tolerated hidden terminals, making it usable for building mobile ad hoc networks prototypes out of notebooks and 802.11 PCMCIA cards. HyperLAN and Bluetooth were some other ad-hoc network standards that addressed and benefited ad-hoc networking.
As a new technology for information acquisition, the mobile ad-hoc network is of high research value and wide application prospects. It has become hot off the press in the last ten years in the globe. Owing to its mobility, dynamic topology, equivalence, self-organizing and other unique features, it has great advantages in emergency communications and military mobile communications. Routing is one of the core issues in mobile ad-hoc network. An effective routing mechanism will be helpful to extend the successful deployment of mobile ad-hoc network. In this thesis, a brief introduction of the mobile ad-hoc network definition, main features, network structure and applications will be given in the first place. Then, three existing pro-active routing protocols (AODV, DSR, TORA) will be presented including their algorithms, terminology, message format and operation process. The main content of this paper is trying to compare these three protocols’ performance in emulated small-scale networks based on the software OPNET Modele