This paper analyzes some issues related to the performance of a recently proposed TCP enhancement, Scalable TCP (S-TCP), over satellite links. First S-TCP features and assesses its performance in satellite networks are discussed, by means of numerical simulations, for a wide range of conditions (fixed users, mobile users, and rainy days). Then, the paper analyzes the impact of S-TCP protocol parameters in a satellite environment, and provides guidelines for their setting in order to improve the system performance. Finally, it presents some possible enhancements deriving from the adoption of erasure codes at the link level (in a cross-layer perspective). In particular, TCP/FEC interactions are analyzed and the optimal operating point is derived.
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