An API-RCP Design Using Pole Placement Technique

As an explicit congestion control protocol, API-RCP (Adaptive PI rate control protocol) was originally proposed for best-effort traffic control in the IP networks with high bandwidth-delay product. The original API-RCP adopts a truncated network model for IP router in order to simplify the control system design while still achieving various designed performance measures at steady-state. A further benefit can be realized if one can specify a desirable transient system response (e.g., a shorter settling time). We have achieved this by using a pole-placement technique on a non-truncated closed-loop network model along with proper assignments of the damping ratio and the undamped natural frequency. Our OPNET simulations demonstrate a satisfactory transient network performance as designed. We also make performance comparison between API-RCP and TCP/RED. In the sequel, we can verify the effectiveness of the original truncated model using theoretical analysis instead of numerous simulations.