Channel assignment with fairness for multi-AP WLAN based on distributed coordination function

Zhang, Heli; Ji, Hong; Ge, Wendong

doi:10.1109/wcnc.2011.5779195

Cited by 10 publications

(7 citation statements)

References 7 publications

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“…Since this method only assigns the channel statically on the AP side, the performance may drop sharply under the high density environment. In [7], the authors propose a kind of global channel allocation method based on graph theory. The main idea is to select the vertex according to the saturation and adjacent degree of vertices to color from the available color sets.…”

Section: Related Workmentioning

confidence: 99%

“…In [9], a kind of distributed flexible channel assignment, called DFCA, is designed to assign the channel width and center frequency to each link based on the interfering relation among clients in the network. Similarly papers [10,11] maximize throughput by the way of allocating nonoverlapping channel. The authors of paper [12,13] try to eliminate the interference by researching channel allocation and power control jointly.…”

Section: Related Workmentioning

confidence: 99%

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Channel Assignment Mechanism for Multiple APs Cochannel Deployment in High Density WLANs

Lei

Jiang

Shang

2018

Wireless Communications and Mobile Computing

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In Wireless Local Area Networks (WLANs), cochannel deployment can bound channel access delay and improve network capacity due to mitigating the collision and interference among different Access Points (APs). In this paper, we present a network model and an interference model for multiple APs cochannel deployment and propose a channel assignment mechanism which formulates the channel assignment problem into a time slot allocation problem. Meanwhile, we assign the channel based on the vertex coloring algorithm and make extra polls by utilizing the time slot reservation strategy to improve the channel assignment. Furthermore, we optimize the polling list of APs through classifying the clients to improve the channel utilization. The simulation results show that our proposed algorithm can improve the performance in terms of network throughput, transmission delay, and packet loss rate compared with the DCF (Distributed Coordination Function) and TMCA algorithms.

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Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Channel Assignment Mechanism for Multiple APs Cochannel Deployment in High Density WLANs

Lei

Jiang

Shang

2018

Wireless Communications and Mobile Computing

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“…Channel assignment with fairness approach (CAFA). [193] formulates ChA as a weighted graph coloring problem where weights are assigned to the set of edges and vertices. The distance of overlapping channels is determined by the normalized interference factor, i.e., I-factor, introduced in [183] (see WCCA explained in Section V-A).…”

Section: Yesmentioning

confidence: 99%

A Review of Software-Defined WLANs: Architectures and Central Control Mechanisms

Dezfouli¹,

Esmaeelzadeh²,

Sheth³

et al. 2018

Preprint

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The significant growth in the number of WiFienabled devices as well as the increase in the traffic conveyed through wireless local area networks (WLANs) necessitate the adoption of new network control mechanisms. Specifically, dense deployment of access points, client mobility, and emerging QoS demands bring about challenges that cannot be effectively addressed by distributed mechanisms. Recent studies show that software-defined WLANs (SDWLANs) simplify network control, improve QoS provisioning, and lower the deployment cost of new network control mechanisms. In this paper, we present an overview of SDWLAN architectures and provide a qualitative comparison in terms of features such as programmability and virtualization. In addition, we classify and investigate the two important classes of centralized network control mechanisms: (i) association control (AsC) and (ii) channel assignment (ChA). We study the basic ideas employed by these mechanisms, and in particular, we focus on the metrics utilized and the problem formulation techniques proposed. We present a comparison of these mechanisms and identify open research problems.

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“…A distributed channel allocation method for multi-rate 802.11n network is proposed considering estimated throughput of each client in network system. In [13][14][15], authors proposed similar distributed channel allocation method based on the interfering relation among clients in the network. The algorithms pay higher cost to exchange information among hosts.…”

Section: Introductionmentioning

confidence: 99%

Partially Overlapping Channel Assignment Using Bonded and Non-Bonded Channels in IEEE 802.11n WLAN

Mamun¹,

Akhter²

2022

Computers, Materials &Amp; Continua

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Nowadays, wireless local area network (WLAN) has become prevalent Internet access due to its low-cost gadgets, flexible coverage and hasslefree simple wireless installation. WLAN facilitates wireless Internet services to users with mobile devices like smart phones, tablets, and laptops through deployment of multiple access points (APs) in a network field. Every AP operates on a frequency band called channel. Popular wireless standard such as IEEE 802.11n has a limited number of channels where frequency spectrum of adjacent channels overlaps partially with each other. In a crowded environment, users may experience poor Internet services due to channel collision i.e., interference from surrounding APs that affects the performance of the WLAN system. Therefore, it becomes a challenge to maintain expected performance in a crowded environment. A mathematical model of throughput considering interferences from surrounding APs can play an important role to set up a WLAN system properly. While set up, assignment of channels considering interference can maximize network performance. In this paper, we investigate the signal propagation of APs under interference of partially overlapping channels for both bonded and non-bonded channels. Then, a throughput estimation model is proposed using difference of operating channels and received signal strength indicator (RSSI). Then, a channel assignment algorithm is introduced using proposed throughput estimation model. Finally, the efficiency of the proposal is verified by numerical experiments using simulator. The results show that the proposal selects the best channel combination of bonded and non-bonded channels that maximize the performance.

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Channel assignment with fairness for multi-AP WLAN based on distributed coordination function

Cited by 10 publications

References 7 publications

Channel Assignment Mechanism for Multiple APs Cochannel Deployment in High Density WLANs

Channel Assignment Mechanism for Multiple APs Cochannel Deployment in High Density WLANs

A Review of Software-Defined WLANs: Architectures and Central Control Mechanisms

Partially Overlapping Channel Assignment Using Bonded and Non-Bonded Channels in IEEE 802.11n WLAN

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