A new window-based burst assembly scheme for TCP traffic over OBS

In this paper, the impact of burstification delay on the TCP traffic statistics is presented as well as a new assembly scheme that uses flow window size as the threshold criterion. It is shown that short assembly times are ideally suitable for sources with small congestion windows, allowing for a speed up in their transmission. In addition, large assembly times do not yield any throughput gain, despite the large number of segments per burst transmitted, but result in a low throughput variation, and thus a higher notion of fairness among the individual flows. To this end, in this paper, we propose a new burst assembly scheme that dynamically assigns flows to different assembly queues with different assembly timers, based on their instant window size. Results show that the proposed scheme with different timers provides a higher average throughput together with a smaller variance which is a good compromise for bandwidth dimensioning. ©2008 Optical Society of America OCIS codes: (060.0060) Fiber optics and optical communications, (060.1155) All-optical networks, (060.4510) Optical communications . References and links 1. C. Qiao and M. Yoo, “Optical burst switching (OBS)-A new paradigm for an optical internet” J. High Speed Networks, vol. 8, no. 1, pp. 69–84, 1999. 2. A. Ge, F. Callegati and L.S. Tamil, “On optical burst switching and self-similar traffic”, IEEE Communication Letters, vol 4, no. 3, pp. 98-100, 2000. 3. M. Düser and P. Bayvel, “Analysis of a dynamically wavelength-routed optical burst switched network architecture,” IEEE/OSA J. Lightwave Technol., vol. 20, pp. 574–585, Apr. 2002. 4. V.M. Vokkarane, K. Haridoss, J. P. Jue, “Threshold-based burst assembly policies for QoS support in optical burst-switched networks”, in Proc. of Optical Networking and Communication Conference (OptiComm), pp. 125-136, 2002. 5. X. Yu, Y. Chen, and C. Qiao, “Study of traffic statistics of assembled burst traffic in optical burst switched networks”, in Proc. of Optical Networking and Communication Conference (OptiComm), pp. 149–159, 2002. 6. X. Cao, J. Li, Y. Chen, and C. Qiao, “Assembling TCP/IP packets in optical burst switched networks” in Proc. of IEEE GLOBECOM, vol. 3, pp. 2808–2812, 2002. 7. M. Casoni and M. Merani, “On the Performance of TCP over Optical Burst Switched Networks with Different QoS Classes”, Lecture Notes in Computer Science, Volume 3375/2005, pp. 574-585, 2005. 8. S. Malik and U. Killat, “Impact of burst aggregation time on performance in optical burst switching networks”, Elsevier J. of Optical Switching and Networking, vol. 2, no. 4, pp. 230-238, 2005. 9. A. Detti and M. Listanti, "Impact of segments aggregation on TCP Reno flows in optical burst switching networks", in Proc. of IEEE INFOCOM, vol. 3, pp. 1803 – 1812, 2002. 10. M. Izal and J. Aracil, "On the Influence of Self-similarity on Optical Burst Switching Traffic", in Proc. of IEEE GLOBECOM, vol. 3, pp. 2308 – 2312, 2002. 11. X. Yu, J. Li, X. Cao, Y. Chen and C. Qiao; “Traffic statistics and performance evaluation in optical burst switched networks”, IEEE/OSA Journal of Lightwave Technology, vol. 22, no. 12, pp. 2722 – 2738, Dec. 2004. 12. X. Yu, C. Qiao and Y. Liu, “TCP implementations and false time out detection in OBS networks”, in proceeding of INFOCOM 2004, vol. 2, pp. 774 – 784, 2004. 13. C. Cameron, H. Le Vu, J. Choi, S. Bilgrami, M. Zukerman, and M. Kang, “TCP over OBS fixed-point load and loss”, Optics Express, vol. 13, no. 23, pp. 9167-9174, 2005.