This paper proposes a novel technique to deal with sudden bandwidth changes in TCP. In the current Internet, sudden bandwidth changes may occur due to vertical handovers between heterogeneous access networks or routing path changes. The current implementation of TCP is designed and optimized for stable networks, and does not adapt well upon sudden bandwidth changes. Consequently, it might suffer from packet losses in burst upon sudden decrements of bandwidth and under-utilization upon sudden increments of bandwidth. To resolve this problem, the paper proposes to modify the current TCP algorithm to include a new phase, called Fast Adaptation (FA).
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