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.
Highlights
Due to the characteristics of the high bandwidth, low cost and easy deployment, Wireless local area network (WLAN) has surrounded us everywhere
To better provide quality-of-service (QoS) for WLAN users, we in this paper propose an improved scheme called “A-EDCA”, based on enhanced distributed channel access (EDCA) of IEEE 802.11e under the infrastructure mode
This paper has considered the problem of IEEE 802.11e EDCA policy which includes not adapting to the timevarying network condition due to the fixed parameter settings and the channel competition ability unfairness between access point (AP) and non-AP STAs
Summary
Due to the characteristics of the high bandwidth, low cost and easy deployment, WLAN has surrounded us everywhere. To accommodate QoS, IEEE 802.11e is proposed including EDCA (enhanced distributed channel access) mode and HCCA (HCF controlled channel access) mode [2]. There exists unfairness of channel access competition ability between AP and non-AP stations (STAs) which is because that AP almost has the same channel access competition ability with one non-AP STA while the number of non-AP STAs is far larger than that of AP. We propose an improved scheme “AEDCA” based on EDCA with a low computation complexity. The remainder of this paper is organized as follows: in Section 2, we present the system model and the brief summary of EDCA policy.
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