| Publisher | KTH - Royal Institute of Technology | ||
|---|---|---|---|
| Format | 162.7KB PDF | Date added | 01 Jan 2007 |
| Topics | TCP - IP | ||
| Downloads | 11 | ||
A fundamental assumption of the tcp protocol is that packet losses indicate congestion on the network. This is a problem when using tcp over wireless links, because a noisy radio transmission may erroneously indicate congestion and thereby reduce the tcp sending rate. Two partial solutions, that improve the quality of the radio link, are power control and link-level retransmissions. By modeling these two lower layers of control loops, the paper derives an analytical model of the delay distribution for ip packets traversing a link. The paper investigates the effect on tcp, in particular the performance degradation due to spurious timeouts and spurious fast retransmits caused by delays and reorder on the link. It is shown that the models allow us to quantify the throughput degradation.
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