A scalable algorithm for link-state QoS-based routing with three metrics

Quality of service (QoS) based routing provides QoS guarantees to multimedia applications and an efficient utilization of the network resources. Nevertheless, QoS routing is likely to be a costly process that does not scale when the number of nodes increases. Thus, the routing algorithm must be simple. This paper proposes and analyses the performance of a link-state QoS routing algorithm that takes into account three metrics: propagation delay, available bandwidth, and loss probability. A heuristic based on the residual loss probability and metric-combination is used to turn the algorithm scalable and solvable in polynomial time. The simulation results show that our algorithm is a promising solution to construct paths constrained on three metrics.