TCP over OBS: Impact of consecutive multiple packet losses and improvements |
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Authors: | Yan Zhang Lemin Li Sheng Wang |
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Affiliation: | (1) School of Communication and Information Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China |
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Abstract: | In TCP over OBS networks, consecutive multiple packet losses are common since an optical burst usually contains a number of
consecutive packets from the same TCP sender. In this paper, we first present a new theoretical method to analyze the behavior
of Reno when consecutive multiple packet losses occur. Results of the analysis indicate that even a small number of consecutive
multiple packet losses can force Reno to timeout. Then we propose B-Reno, a newly designed TCP implementation that can overcome
Reno’s inefficiency in dealing with consecutive multiple packet losses over OBS networks and can avoid the shortcomings of
New-Reno and SACK. Results of comprehensive simulations indicate that B-Reno over OBS networks can achieve a performance better
than Reno and New-Reno, and that it can also achieve a performance similar to that of SACK. Moreover, B-Reno only needs some
simple modifications to New-Reno at the sender’s protocol stack, and thus has less difficulty in deployment and less protocol
complexity than that of SACK.
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Keywords: | OBS TCP Consecutive multiple losses Throughput |
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