Removing the MAC Retransmission Times from the RTT in TCP E. Dedu, S. Linck, F. Spies Laboratoire d'Informatique de l'Université de FrancheComté (LIFC) Montbéliard, France Euromedia'2005 Toulouse, France 11 April 2005
Problem: RTT modification ●
TCP works very well in wired links –
very few physical losses
–
most losses are due to network congestion ●
●
S
D
TCP reduces packet rate, in order to eliminate congestion
TCP is not adapted to wireless links MAC retransmissions => increase of RTT ●
RTT as congestion indicator (queue length) is no longer appropriate
●
RTO depends on RTT, it is falsely modified too
long => lost packets ●
=> inappropriate congestion control actions, since not congestion 2 / 14
Problem: RTT effects ●
●
Several CC mechanisms use the RTT: –
each RTT: TCP Vegas
–
the smallest RTT: Westwood+, TIBET
–
any solution where RTT might be used: RTP/RTCP over UDP
TCP Vegas: for each packet reception, it compares its RTT against the estimated RTT: –
if diff Incremental deploying possible
6 / 14
Principle: retransmission time computing ●
Each network card has a timer
●
For each packet: –
when the packet is sent, the timer is initialised with the value of the TCP option
–
each time the packet is resent, the value of the timer is stored in the option => lost times are added Fixed src AP Mobile dest 0 > 0 >X 54 > 54 X
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