TITLE:
Network-Load Aware Adaptive Channel Access Control for WLAN
AUTHORS:
Xiaoyan Wu, Qinghe Du, Pinyi Ren
KEYWORDS:
Quality of Service (QoS); IEEE 802.11e; Enhanced Distributed Channel Access (EDCA)
JOURNAL NAME:
Communications and Network,
Vol.5 No.3C,
October
4,
2013
ABSTRACT: Wireless local area network (WLAN) brings us a low cost
and high bandwidth experience and thus plays a critically important role in
current/future networks to support high-rate transmissions. To better provide
quality-of-service (QoS) for WLAN users, we in this paper propose an improved
scheme called “A-EDCA”(adaptive EDCA), based on enhanced distributed channel access
(EDCA) of IEEE 802.11e under the infrastructure mode. Our proposed scheme aims
at efficiently adapting the transmission over WLAN to the time-varying network
conditions and mitigating the competition ability unfairness between access
point (AP) and non-AP stations (STAs). Specifically, all non-AP STAs adaptive-ly
modify the contention window based on the network condition. Moreover, AP skips
the backoff phase by setting its backoff counter as zero when non-AP STA
completes transmission successfully to relieve the unfairness. At last, simulation
results demonstrate the effectiveness of the proposed approach.