Performance improvement of 802.11 wireless network with TCP ACK agent and auto-zoom backoff algorithm

TitlePerformance improvement of 802.11 wireless network with TCP ACK agent and auto-zoom backoff algorithm
Publication TypeConference Paper
Year of Publication2005
AuthorsPang, Q., S. C. Liew, and V. C. M. Leung
Conference NameVehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st
Pagination2046 - 2050 Vol. 3
Date Publishedmay.
Keywords802.11 wireless network, access protocols, autozoom backoff algorithm, contention windows, IEEE 802.11 WLAN access protocol, radio access networks, TCP ACK agent, TCP data segment, TCP protocols, TCP throughput, transport protocols, wireless LAN

This paper proposes two schemes to improve the TCP performance over 802.11 WLAN access protocol. In the standard 802.11 and TCP protocols, a TCP data segment is acknowledged twice, once at the MAC layer, and once at the TCP layer. By a simple cross-layer design, a TCP ACK agent is installed at the WLAN AP. When a MAC acknowledgment is received by the AP, the AP generates a TCP ACK on behalf of the WLAN stations. Together with the TCP ACK agent scheme, an auto-zoom backoff algorithm is proposed to further improve the access performance. In the auto-zoom backoff, the contention windows can be progressively reduced to a very low value in case of light or asymmetric traffic, and return to normal quickly when collision occurs. With the TCP ACK agent and auto-zoom backoff, we show that significant improvement in TCP throughput performance can be achieved in typical Internet application scenarios.


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