A Three-Tier Framework Supporting Soft QoS Routing in MANET

Mobile Ad hoc Networks (MANET) is a collection of randomly moving wireless devices within a particular area. Unlike in cellular networks, there are no fixed base-stations to support routing and mobility management. Further more, many resources such as power energy and bandwidth are very limited in MANET. Concentrating on resolving these problems, we present a three-tier framework. The framework contains three cooperative algorithms, SSCA, DSRU and SQAR. SSCA is mainly responsible for topology management, DSRU is responsible for updating the routing information and the responsibility of SQAR is to select path which satisfies the QoS requirement. Experiment on the GloMoSim simulator shows that the framework proposed in this paper results in a notable reduction on energy consumption, routing overhead, packet collision times and rerouting times, and a notable improvement on network throughput and link stability, especially for the networks composed of high-speed mobile hosts.