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Characteristics of mobile ad hoc networks (MANETs) such as lack of central coordination, dynamic topology and limited resources pose a challenging problem in quality of service (QoS) routing. Providing an efficient, robust and low overhead QoS unicast route from source to destination is a critical issue. Bandwidth and route stability are the major important QoS parameters for applications where long duration connections are required with stringent bandwidth requirements for multimedia applications. This paper proposes an On-demand Bandwidth and Stability based Unicast Routing scheme (OBSUR) in MANET by adding additional QoS features to existing Dynamic Source Routing (DSR) protocol. The objective of the OBSUR is to provide QoS satisfied, reliable and robust route for communicating nodes. The scheme works in following steps. (1) Each node in the network periodically (small regular intervals) estimates bandwidth availability, node and link stability, buffer availability, and stability factor between nodes. (2) Construction of neighbor stability and QoS database at every node which is used in route establishment process. (3) The unicast path is constructed by using route request and route reply packets with the help of route information cache, and (4) route maintenance in case of node mobility and route failures. Simulation results show that there is an improvement in terms of traffic admission ratio, control overhead, packet delivery ratio, end to end delay and throughput as compared to Route Stability Based QoS Routing (RSQR) in MANETs. [ABSTRACT FROM AUTHOR]

Ad-hoc wireless networks are power constrained as the nodes operate with limited battery energy. To maximize the lifetime of these networks, transactions through each mobile node must be controlled in such a way that the power dissipation rates for the nodes are almost the same. At the same time, providing QoS for ad-hoc networks is a complex task due to the ever-changing network topology. This paper addresses the problem of power and bandwidth aware routing. We propose a power and bandwidth aware source initiated routing model for mobile ad-hoc networks. The model uses both the static and mobile intelligent agents. The agents together find an optimal path among the available routes. The model is simulated to test its operational effectiveness in various network scenarios. We observed that the agents provide more flexible and adaptable routing services and also support component based software engineering features such as software reuse, maintainability, customization, and encapsulation. [ABSTRACT FROM AUTHOR]