AOS: adaptive offset time scheduling for TCP fairness in optical burst-switched network

Hongyun Zheng; Yongxiang Zhao; Changjia Chen

doi:10.1117/12.635059

5 December 2005 AOS: adaptive offset time scheduling for TCP fairness in optical burst-switched network

Hongyun Zheng, Yongxiang Zhao, Changjia Chen

Proceedings Volume 6022, Network Architectures, Management, and Applications III; 602232 (2005) https://doi.org/10.1117/12.635059
Event: Asia-Pacific Optical Communications, 2005, Shanghai, China

Abstract

Optical Burst-switched (OBS) is a promising switching technology and expected to support the future Internet backbone with dramatically increasing bandwidth demand. In an OBS network, burst contention causes burst loss due to bufferless nature of OBS core network. This kind of burst loss will interact with the above TCP layer. In this paper, we study the impact of this interaction on TCP fairness. We find significant unfairness among TCP flows that share the OBS core network, i.e. one flow obtains higher throughput while any others with much lower throughputs. The cause is the phenomenon called "the bigger eats the smaller (BES)", in which a TCP flow with higher rate occasionally will "see" less burst contentions and increase its rate further, while a TCP with lower rate will see more burst contentions and decrease its rate continually. Discuss a simple model to explain BES and verify that a continuous sequence of bursts will enhance BES. Then observe that offset time will be a good choice to control TCP fairness by a curve of unfairness control with offset time adjustment. Finally an adaptive offset time scheduling (AOS) algorithm is proposed. AOS assigns burst offset time value adaptive to the rate of TCP flow. The simulation results show that the fairness can be significantly improved by our AOS scheme.

Citation Download Citation

Hongyun Zheng, Yongxiang Zhao, and Changjia Chen "AOS: adaptive offset time scheduling for TCP fairness in optical burst-switched network", Proc. SPIE 6022, Network Architectures, Management, and Applications III, 602232 (5 December 2005); https://doi.org/10.1117/12.635059

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