SDN-Based Centralized Channel Assignment Scheme Using Clustering in Dense WLAN Environments
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SDN‑Based Centralized Channel Assignment Scheme Using Clustering in Dense WLAN Environments Tahira Mahboob1 · Hwi Young Lee1 · Minsu Shin1 · Min Young Chung1
© Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract IEEE WLAN 802.11 uses a contention-based medium access control protocol. Adjacent WLAN access points (APs) and stations (STAs) sharing the same channels causes interference, and affect network performance. Existing distributed channel selection schemes are prone to channel oscillation and ripple effect problems. Additionally, centralized schemes may provide optimal or sub-optimal performance but the computation time complexity increases with number of APs. In this paper, we propose a clustering-based centralized channel selection scheme implemented using software-defined networking architecture to overcome these limitations. In the proposed scheme, we first group the APs using a similarity-based clustering algorithm using proximity information. The channel assignment problem is then formulated using an integer linear programming model. Performance evaluation using simulations indicate that the proposed scheme outperforms the common least congested channel selection (LCCS), in terms of throughput and required number of channels switching. for N number of APs, the computation complexity is ) ( ) Additionally, ( reduced from O 3N to O (N)2 , in comparison to the common centralized channel selection scheme. The test bed results validate simulation results by achieving better data rates for the STAs compared with the LCCS scheme. Keywords WLAN · Software-defined networking · Centralized channel assignment
* Min Young Chung [email protected] Tahira Mahboob [email protected] Hwi Young Lee [email protected] Minsu Shin [email protected] 1
Department of Electrical and Computer Engineering, Sungkyunkwan University, 2066 Seobu‑ro, Jangan‑gu, Suwon‑si, Gyeonggi‑do 16419, Republic of Korea
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1 Introduction Massive proliferation of end-user devices, such as smart phones and tablet PCs, has led to the popularity of wireless local area network access points (WLAN APs) since they provide adequate data rate services at lower costs [1]. WLAN is based on the IEEE 802.11 standard, and uses carrier sense multiple access with collision avoidance (CSMA/CA) as the content-based medium access control (MAC) scheme [2]. Dense deployment of WLAN APs and stations (STAs) in enterprise networks, and public and residential areas leads to severe contention by the neighboring APs and STAs. These devices are able to utilize only a limited number of non-overlapping channels in the unlicensed industrial, scientific and medical (ISM) 2.4 GHz and 5 GHz bands. The problem is aggravated as number of contending devices increases and influences overall system performance. Thus, a mechanism is required for APs to select and operate on non-overlapping channels [3]. To address the performance issues of WLAN, the high efficiency WLAN task group (HEW TG) is currently working on the
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