Thomas Kunz
Systems and Computer Engineering
9
Link Level Retransmissions
A More Accurate Picture
nFrequent errors increase RTO significantly on slow wireless links
–RTT on slow links large, retransmissions result in large variance, pushing RTO up
–Likelihood of interference between link layer and TCP retransmissions smaller
–But congestion response will be delayed due to larger RTO
–When wireless losses do cause timeout, much time wasted