Multipath QOS Routing for Mobile Adhoc Networks- A review

Mobile Ad-hoc networks (MANET) are a collection of wireless nodes which do not have any infrastructure unlike cellular networks which are infra-structured (i.e. base-stations are present). MANET consists of nodes (mobiles or laptops) that can act both as routers or hosts. The nodes communicate through radio waves. Range of each node is limited. If a receiver does not lie in senders range then the intermediate nodes act as routers. Routing refers to sending the data from source to destination by first finding a route and then maintaining a route fulfilling QoS requirements. This paper provides glimpses on multipath routing. Multipath routing allows the establishment of multiple paths between a single source and single destination node. It is typically proposed in order to increase the reliability of data transmission (i.e., fault tolerance) or to provide load balancing. Load balancing is of especial importance in MANETs because of the limited bandwidth between the nodes. It is very well known that in the mobile ad hoc network paradigm (MANET), routing is a challenging task, not only because of the dynamic topology caused by mobility, but also because of the limitations in bandwidth, range and power. From the review, it is observed that multipath routing minimizes the consequences of security attacks deriving from collaborating malicious nodes in MANET, by maximizing the number of nodes that an adversary must compromise in order to take control of the communication