Conference Paper

VQ-RED: An efficient virtual queue management approach to improve fairness in infrastructure WLAN

Dept. of Comput. Sci., Hong Kong Univ. of Sci. & Technol., Kowloon, China
DOI: 10.1109/LCN.2005.136 Conference: Local Computer Networks, 2005. 30th Anniversary. The IEEE Conference on
Source: IEEE Xplore


In this paper, we consider two fairness problems (downlink/uplink fairness and fairness among flows in the same direction) that arise in the infrastructure WLAN. We propose a virtual queue management approach, named VQ-RED to address the fairness problems. We demonstrate the effectiveness of our approach by conducting a series of simulations. The results show that compared with standard DCF, VQRED not only greatly improves the fairness, but also reduces packet delays.

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    • "It also reviews various solutions proposed in the literature to provide fair bandwidth allocation among TCP flows in infrastructure mode WLANs. Fairness issues caused by TCP and MAC protocol interaction are discussed in [4] [5] [6] [7] [8]. Pilosof et al. [5] observed unfair allocation of the network bandwidth between upstream flows and downstream flows through network measurements. "
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    ABSTRACT: Cross-layer interaction of Distributed Coordination Function (DCF) of 802.11 MAC protocol and TCP transport protocol leads to two types of unfairness. In a mixed traffic scenario, short-lived TCP flows suffer from poor performance compared to the aggressive long-lived flows. Since the main source of Internet traffic is small file web transfers, this issue forms a major challenge in current WLANs which is called size-based unfairness. In addition, when sharing an access point bottleneck queue, upstream flows impede the performance of downstream flows resulting in direction-based unfairness. Proposed solutions in the literature mostly rely on size-based scheduling policies. However, each proposed method is able to solve any of these two mentioned aspects, none of them can provide both size-based and direction-based fairness in a unique solution. In this paper, we propose a novel queue management policy called Threshold-Based Least Attained Service-Selective Acknowledgment Filtering (TLAS-SAF). We show analytically and by simulation that TLAS-SAF is capable of providing both direction-based and size-based fairness and can be taken into account as a unique solution to be applied at access point buffers.
    EURASIP Journal on Wireless Communications and Networking 01/2010; 2010(1). DOI:10.1155/2010/818190 · 0.72 Impact Factor
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    • "The queue management strategies for a single MAC queue, designed for the uplink/downlink fairness improvement can be found in [8] [12] [16] [23] "
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    ABSTRACT: In this paper the unfairness problems in wireless 802.11 LAN are researched and studied via simulation. The contributions are twofold. First of all, the intra-class fairness of the EDCA queues for downlink streams, in the presence of bidirectional traffic is investigated. Secondly, Active Queue Management schemes are evaluated as an possible improvement for the intra-class fairness. The simulation results show that some algorithms provide more equal share of wireless channel as well as the lower drop rate.
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    • "All approaches overviewed above either depend on a specific network infrastructure [12] or require modifications at the sender [14]. The closest approach to the one presented in this paper is [13]. However, as many other proposals, it operates as a standalone module and it doesn't use any parameters provided by other network nodes. "
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    ABSTRACT: In this paper, we introduce a novel queue management technique for the buffer space at the base station of infrastructure 802.11 networks that considers mobile user's receiving characteristics. The maximum amount of the base station buffer that can be used by a given flow is updated proportionally to RTT, measured at the mobile nodes and sent to the base station my the mean of link layer acknowledgements. In this way, the proposed scheme remains transparent to high-level protocols. The proposed approach makes possible the implementation of algorithms able to provide RTT-fairness in wired-cum-wireless networks. Results show the advantage of the proposed queue management scheme when compared to that of traditional drop-tail queue management.
    Proceedings of the Global Communications Conference, 2009. GLOBECOM 2009, Honolulu, Hawaii, USA, 30 November - 4 December 2009; 01/2009
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