Delay-minimized routing based on bandwidth estimation for Ad Hoc networks

QoS routing protocol has become a hot research spot. However, it is difficult to offer guaranteed QoS, such as bandwidth, delay and delay jitter. To solve this problem, we proposed a Delay-Minimized Routing protocol based on Bandwidth Estimation (DMR-BE) that incorporates an admission control scheme and a route decision scheme to meet the QoS requirement of bandwidth and real-time applications. Bandwidth is used as constrains in the route discovery process to find paths that meet the bandwidth requirements. When making route decision, delay is taken into consideration so that the path with the minimum end to end delay can be selected. DMR-BE presented a new method of estimating the bandwidth consumption of data flows and has taken waiting time into consideration when accessing channels. Simulation results show that it has good performances in the end to end delay and throughput, which provides guaranteed QoS on bandwidth and delay.