TCP Simulation Evaluations over Ad Hoc Wireless Networks(12)

The Transmission Control Protocol (TCP) represents the most deployed transport protocol used in the Internet so far. This popularity motivates its presence in wireless networks, including ad hoc networks. These networks are very promising since they make i

D.RetransmissionsIncludingPacketErrorRateof5%

Inthissection,weinvestigatethebehaviouroftheretransmissioninadhocnetworkswithlosses.WeusedthesametopologyevaluatedinsectionV-Dcontainingpacketerrorrateof5%.Theresultsfor2and5hopsareshowninFigs.7and8,whichincludesevaluationsfor1or10 ows,respectively.

Number of Retransmissions Retransmissions vs. Paket Size (1 flows / 5%) 120NewReno Sack NewReno DASack DA 80 40 0 0 200 400 600 800 1000 1200 1400 1600

Paket Size (bytes)

(a)1 ow2hops

Number of Retransmission Retransmissions vs. Paket Size (1 flows / 5%) 120NewReno Sack NewReno DASack DA 80 40 0 0 200 400 600 800 1000 1200 1400 1600

Paket Size (bytes)

(b)1 ows5hops

Fig.7.Numberofretransmissionsfor1 owwithpacketerrorrateof5%

Figs.7and8showthatitisnotalwayspossibletogetthebestresultswithDAoption.OnceagaintheresultsdonotallowustomakecleardistinctionbetweenTCPNewrenoandTCPSACK avors.ItwasexpectedthatTCPSACKwouldperformbetterunderlosses,

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