Cross-Layer Metrics for Reliable Routing in Wireless Mesh Networks and Understanding of OLSR and ODSBR

Abstract

Wireless Technology is used because of its suitability to mobile applications. It is mainly categorized into two types. Wireless Network with Infrastructure and Wireless Network without Infrastructure.WMN (Wireless Mesh Network) costs less to setup a network and is flexible in the network. Internet Technology is made up of logically organized layers. Mobility support cannot be implemented within a single layer efficiently so it requires cross-layer awareness and cooperation. Cross-Layer is done by allowing layers to exchange information to obtain performance gains. "Scope” defines the cross-layer approach boundaries.  Cross-Layer Solutions allow interdependence and joint development of protocols. Because of the highly unstable wireless medium of WMN the design of algorithms that consider link quality to choose the best route are enabling routing metrics and protocols to evolve. "Cross-Layer Metrics” is proposed for efficient and reliable routing, identify selfish participantsand manage traffic. Cross-Layer Metrics with EFW, MEFW and JEFW metrics are used to cope up with the problem of selfish behavior of mesh routers i.e., packet dropping and are combined in a cross layer fashion with the routing layer observations of forwarding behavior with MAC Layer measurements of wireless link quality to select the most Reliable and High Performance Path. OLSR and ODSBR are explained elaborately.