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| Link
Level Retransmissions |
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| A More Accurate
Picture |
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| n | Frequent
errors increase RTO significantly on |
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| slow
wireless links |
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| – | RTT
on slow links large, retransmissions result in large |
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| variance,
pushing RTO up |
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| – | Likelihood
of interference between link layer and TCP |
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| retransmissions
smaller |
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| – | But congestion response will be
delayed due to
larger |
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| RTO |
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| – | When
wireless losses do cause timeout, much time |
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| wasted |
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