28th Annual IEEE International Conference on Local Computer Networks (LCN'03)
Performance evaluation of Westwood+ TCP over WLANs with Local Error Control
Bonn/K?nigswinter, Germany
October 20-October 24
ISBN: 0-7695-2037-5
Link layer error control is widely adopted in Wireless LANs (WLANs) to hide the unreliability of the wireless channel to higher level protocols. This allows classic end-to-end congestion control algorithms to achieve acceptable throughput even in the presence of radio links. The present work investigates the performance of Westwood+ and NewReno TCP over a noisy wireless LAN channel. In particular, the effect of local error control persistency on the end-to-end performances of Westwood+ and NewReno TCP is addressed. The investigation has been carried out by using ns-2 computer simulation. Simulation results show that (1) in the presence of uniformly distributed packet losses a well tuned local error control leads both Westwood+ and NewReno TCP to full network utilization; (2) in the presence of bursty losses Westwood+ TCP improves the good-put with respect to NewReno TCP also in the presence of local error control; in particular, Westwood+ TCP requires a smaller number of retransmissions at the link layer than New Reno to achieve full utilization of the wireless channel.
Citation:
Luigi A. Grieco, Saverio Mascolo, "Performance evaluation of Westwood+ TCP over WLANs with Local Error Control," lcn, pp.440, 28th Annual IEEE International Conference on Local Computer Networks (LCN'03), 2003