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Modeling Network Coded TCP Throughput: A …
Modeling Network Coded TCP Throughput: A Simple Model and its ValidationMinJi KimMITC ambridge, MA M dardMITC ambridge, MA o BarrosUniversity of PortoPorto, analyze the performance of TCP and TCP with net-work coding (TCP/NC) in lossy wireless networks. We buildupon the simple framework introduced by Padhyeet characterize the throughput behavior of classical TCPas well as TCP/NC as a function of erasure rate, round-trip time, maximum window size, and duration of the con-nection. Our analytical results show that Network codingmasks random erasures from TCP, thus preventing TCP sperformance degradation in lossy networks ( wirelessnetworks). It is further seen that TCP/NC has signifi-cant throughput gains over TCP. Our analysis and simu-lation results show very close concordance and support thatTCP/NC is robust against erasures. TCP/NC is not onlyable to increase its window size faster but also to maintain alarge window size despite the random losses, whereas TCPexperiences window closing because losses are mistakenlyattributed to congestion.
Modeling Network Coded TCP Throughput: A Simple Model and its Validation MinJi Kim MIT Cambridge, MA 02139 minjikim@mit.edu Muriel Médard MIT Cambridge, MA 02139
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