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In optical burst-switched (OBS) networks, the loss of burst containing a number of IP packets occurs mostly due to contention rather than congestion so that a TO (Time Out) event will trigger unnecessary TCP congestion control resulting in significant throughput degradation (X. Yu, et al., 2004). Therefore, in this letter, we propose a drop policy (DP) with burst retransmission where a new concept of retransmission-count for bursts is introduced to mitigate unnecessary TCP congestion control. The analytical and simulation results show that the TCP throughput is improved by our proposed DP with burst retransmission.
Date of Publication: Apr 2006