Abstract
In this paper, a novel and simple search algorithm called distributed weighted fair queuing (DWFQ) algorithm is proposed for the quality-of-service (QoS) in IEEE 802.11e wireless local area networks (WLANs). We first propose that the IEEE 802.11e enhanced distributed coordination function (EDCF) is an efficient algorithm to support the QoS in WLANs, although it can provide more bandwidth to packets with higher priority. However, when the system under heavy traffic load situation, IEEE 802.11e EDCF can't guarantee the fair allocation of excess bandwidth of each access categories (ACs), i.e., under heavy traffic load, EDCF guarantees the QoS of packets with higher priority by reducing the QoS of packets with lower priority. This paper discuses an EDCF scheme, in order to distribute bandwidth fairly among different ACs under heavy traffic load situation in WLAN, we propose multiple flows DWFQ algorithm. This algorithm not only supports the concept of differentiating ACs with different priorities but also guarantees the fair allocation of each ACs according to their relative weights. Furthermore, in this propose a mechanism to resolve the overload situation problem and doubling contention window (CW) method to reduce the collision probability. The simulations performed show that multiple flows DWFQ with doubling CW method which can perform an attractive performance even under heavy traffic load.
Highlights
IntroductionThe wireless local area networks (WLANs) market is experiencing an explosive growth
In recent years, the wireless local area networks (WLANs) market is experiencing an explosive growth
We have proposed the multiple flows distributed weighted fair queuing (DWFQ) architecture for providing weighted fair queuing in IEEE 802.11e WLANs
Summary
The wireless local area networks (WLANs) market is experiencing an explosive growth. The work in [17] proposed schemes in which accessing nodes announce their future BF information in the medium access control (MAC) header of their frame being transmitted These performance studies neglected that if each station (STA) uses original IEEE 802.11e EDCF to access channel under heavy traffic load condition, the performance of each STA will be inefficient because of collisions. Future traffic demands require quality-of-service (QoS) provisioning and higher network capacity To address the former, the IEEE 802.11 Task Group “E” has defined enhancements to the IEEE 802.11 distributed coordination function (DCF) mechanism. Multiple Flows Distributed Weighted Fair Queuing (DWFQ) Algorithm in 802.11e EDCF
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