QoS constrained IP routing

We propose an integrated routing protocol (IRP) as a solution to the delay-constrained least-cost routing problem. To guarantee the real-time delivery of packets, IRP establishes QoS channels in two stages: a forward routing stage and a backward setup stage (FRBS). Establishing a connection that provides a guaranteed service involves routing, signaling, call admission, and resource reservation. A comprehensive simulation model is developed to study the performance of the proposed scheme under different traffic characteristics and network parameters. Preliminary performance result shows that IRP enhances the probability of call acceptance by providing multiple paths choices between single pair of source and destination node. IRP is also shown to adapt better to changes in network paths and link characteristics as it achieves low call blocking ratios.