Abstract

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.

Keywords: Diffserv; RTT; UDP; Target rate; Bandwidth; Fairness

Article Outline

1. Introduction

2. Background and related work

2.1. Time sliding window three color marker

2.1.1. TSW meter

2.1.2. TSW marker

2.1.3. Problems of TSW3CM

2.2. Intelligent traffic conditioner

2.2.1. RATC

2.2.2. TATC

2.2.3. DDPM mechanism

2.2.4. Problems of ITC

3. Fair bandwidth distribution mechanism

3.1. Design of proportionally fair differentiated service architecture

3.2. Function of an edge node in the PFDSA

3.2.1. tmTRA3CM

3.2.2. um3CM

3.3. Function of a core node in the PFDSA

3.3.1. TRBD mechanism

3.3.2. TRAF mechanism

4. Simulations and evaluation

4.1. Comparison according to different RTTs

4.2. Comparison according to the effect of UDP

4.3. Comparison according to different target rates

4.4. Comparison in various effects coexisting condition

5. Conclusion and further work

Acknowledgements

References

Vitae