tailieunhanh - Special Issue on ‘‘Mobile Ad-Hoc Wireless Networks

Mobile Ad Hoc wireless Networks (MANETs) is defined as a multi-hop infrastructureless wireless network which is self-organized and connects two or more stations spontaneously in the absence of central point or any access point. It allows peer-to-peer connections between devices that are operating in ad-hoc mode and are within the wireless range. They can form standalone groups of wireless nodes and can be connected to a cellular or fixed network. Nodes in a mobile adhoc network are free to move and organize themselves in an arbitrary fashion. Each user is free to roam about while communicating with others. Ad-hoc networks are suited for use in situations where an infrastructure is unavailable or when the costs to deploy one are very high. | Journal of Advanced Research 2011 2 195-198 Cairo University Journal of Advanced Research EDITORIAL Special Issue on Mobile Ad-Hoc Wireless Networks Mobile Ad Hoc wireless Networks MANETs is defined as a multi-hop infrastructureless wireless network which is self-organized and connects two or more stations spontaneously in the absence of central point or any access point. It allows peer-to-peer connections between devices that are operating in ad-hoc mode and are within the wireless range. They can form standalone groups of wireless nodes and can be connected to a cellular or fixed network. Nodes in a mobile ad-hoc network are free to move and organize themselves in an arbitrary fashion. Each user is free to roam about while communicating with others. Ad-hoc networks are suited for use in situations where an infrastructure is unavailable or when the costs to deploy one are very high. Mobile ad-hoc networking is a multi-layer architecture that normally involves the physical medium access layer MAC network layer and transport layers. Nodes in ad-hoc networks perform self-organization. Their tasks include neighbor discovery and topology organization and reorganization. Every node looks for activities from its neighbor and exchange topology information periodically. Additionally ad-hoc networks have self-configuring and self-healing capabilities. Ad-hoc networks are also very scalable. The hybrid architectures in ad-hoc networks can increase scalability by combining multihop relaying and base stations. Ad-hoc wireless networks can easily address the shortcomings of presently available wireless networks. They can also improve the efficiency of wireless networks. The application of this technology is far-reaching as it can achieve numerous functionalities which have never been possible before. Hence development of wireless Ad-hoc networks can immensely change the way we visualize implement and use the wireless technology today. Ad-Hoc networks have many applications. For