A fair bandwidth distribution mechanism in a Diffserv network

Previous works for the Assured Forwarding (AF) service in a Diffserv network have no sufficient consideration on the target rate and the effect of RTT and UDP in achieving the fairness of bandwidth share. Also previous works act like Best-effort service in an Under-Provisioned Network (UPN) condition. In this paper, in order to solve these problems, we propose the Proportionally Fair Differentiated Service Architecture (PFDSA), which is composed of tcp-microflow based Target rate and RTT Aware Three Color Marker (tmTRA3CM), udp-microflow based Three Color Marker (um3CM), Target Rate Based Dropper (TRBD), and Target Rate Adjusting Function (TRAF). In the results of comparisons on the performance among existing mechanisms and the PFDSA in the OPN (Over-Provisioned Network) and the UPN conditions, the PFDSA was able to further mitigate the RTT and UDP effects than the previous works. The PFDSA was shown to provide better fair bandwidth distribution proportional to various target rates even in the UPN condition.