Computer Networks: The International Journal of Computer and Telecommunications Networking
EUC'07 Proceedings of the 2007 international conference on Embedded and ubiquitous computing
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Link layer error control is widely adopted in WirelessLANs (WLANs) to hide the unreliability of the wirelesschannel to higher level protocols. This allows classic end-to-end congestion control algorithms to achieve acceptablethroughput even in the presence of radio links. Thepresent work investigates the performance of Westwood+and NewReno TCP over a noisy wireless LAN channel. Inparticular, the effect of local error control persistency on theend-to-end performances of Westwood+ and NewReno TCPis addressed. The investigation has been carried out by usingns-2 computer simulation. Simulation results show that(1) in the presence of uniformly distributed packet losses awell tuned local error control leads both Westwood+ andNewReno TCP to full network utilization; (2) in the presenceof bursty losses Westwood+ TCP improves the good-putwith respect to NewReno TCP also in the presence oflocal error control; in particular, Westwood+ TCP requiresa smaller number of retransmissions at the link layer thanNew Reno to achieve full utilization of the wireless channel.