Traffic-Aware Channel Assignment in Enterprise Wireless LANs

Rozner, Eric; Mehta, Yogita; Akella, Aditya; Qiu, Lili

doi:10.1109/icnp.2007.4375844

Cited by 64 publications

(78 citation statements)

References 15 publications

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“…The performance imbalance problem is mainly due to the fundamental limitation of CSMA-based random access mechanism, which gives preference in media access to some links over others depending on their spatial locations [23,16]. Although the inter-cell channel contention and interference can be reduced by allocating orthogonal channels to neighbor cells [19,28,22,17,34], only 3 orthogonal channels are available in the 2.4 GHz band, which is not enough to eliminate the co-channel interference. Consequently, the inter-cell channel contention and interface are inevitable in such the multi-cell environment with high AP densities.…”

Section: Introductionmentioning

confidence: 99%

“…It provides good fairness and can also take full advantage of partially-overlapped channels for a throughput gain in densely-deployed networks. A recent study in [34] considered the traffic pattern for the selection of channels, showing that traffic-aware channel assignment can significantly improve the quality of a channel assignment.…”

Section: Related Workmentioning

confidence: 99%

“…There have also been numerous efforts to mitigate the inter-cell interference problem, including channel assignment [17,28,34], power control (or carrier sense control) [8,26,36], and association control [9,10].…”

Section: Related Workmentioning

confidence: 99%

“…The high-density deployment of APs has potential for numerous benefits including ubiquitous service coverage, seamless handover, and improved link quality to the clients [22,35]. Despite their potential merits, however, the high-density WLANs suffer from severe performance degradation and unfair throughput imbalance due to significant channel contention among cochannel neighboring cells [7,19,34]. The performance imbalance problem is mainly due to the fundamental limitation of CSMA-based random access mechanism, which gives preference in media access to some links over others depending on their spatial locations [23,16].…”

Section: Introductionmentioning

confidence: 99%

“…Large-scale deployment of 802.11 WLANs with a high density of access points (APs) has received significant attention in recent years with rapidly increasing use of mobile computing devices, such as laptops, PDAs, and Wi-Fi-enabled phones [19,34]. Such WLANs have become wide-spread, common enterprise and university campus networks [35].…”

Section: Introductionmentioning

confidence: 99%

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QoS provisioning for large-scale multi-ap WLANs

Choi¹,

Shin²

2012

Ad Hoc Networks

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Large-scale deployment of IEEE 802.11 wireless LANs (WLANs) with a high density of access points (APs) has become commonplace due mainly to its potential for numerous benefits, such as ubiquitous service coverage, seamless handover, and improved link quality. However, the increased AP density can induce significant channel contention among neighboring cells, thus causing severe performance degradation and throughput imbalance between cells. There have been a plethora of research efforts to improve the WLAN performance, but most of them focused only on single WLAN environments without accounting for intercell contention. The de facto QoS provisioning mechanism for WLANs, i.e., the Enhanced Distributed Channel Access (EDCA), is no exception to this. The EDCA focuses only on inter-flow priority distinction and has not considered the effect of inter-cell contention which significantly restricts its efficiency. This paper presents an enhanced QoS provisioning framework that takes into account inter-cell level differentiation as well as inter-flow level priority, which may be viewed as extension of QoS provisioning from a single-WLAN domain to a multi-WLAN domain. We also propose an architecture for managing multi-AP systems in which a central controller regulates the wireless channel occupancy of APs by adaptively configuring the cell-level QoS parameters. Our extensive simulation results show that the proposed inter-AP cooperative QoS scheme overcomes the limit of legacy 802.11e and provides a high level of fairness in large-scale denselydeployed WLANs.

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Section: Introductionmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Related Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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QoS provisioning for large-scale multi-ap WLANs

Choi¹,

Shin²

2012

Ad Hoc Networks

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Partially overlapping channel assignment for WLANs using SINR interference model

Zhou

Jia

Chang

et al. 2013

Int J Communication

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SUMMARYThe use of multiple channels in 802.11 wireless local area networks can improve network performance. Many efforts have been done to better exploit multiple non-overlapped channels. However, the number of orthogonal channels in the Institute of Electrical and Electronics Engineers 802.11 standards is very much limited. Recent studies indicate that we can improve the full-range channel utilization and the network throughput by properly utilizing the partially overlapping channels. However, little work was focused on channel assignment for partially overlapping channels. In this paper, we investigate the problem of partially overlapping channel assignment to improve the performance of 802.11 wireless networks based on the Signal to Interference-Noise Ratio interference model. Using the Signal to Interference-Noise Ratio model, we deduce a direct relationship between maximizing system throughput and minimizing total interference when partially overlapping channels are employed. After that, we propose a greedy method to minimize the total interference for throughput maximization. We evaluate our algorithm through extensive simulations and compare its performances with those of the state-of-the-art.

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Dynamic frequency management in 802.11‐based multi‐radio wireless networks

Athanasiou

2014

Trans. Emerging Tel Tech

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Efficient channel selection is essential in 802.11 mesh deployments, for minimising contention and interference among co-channel devices and thereby supporting a plurality of quality of service (QoS)-sensitive applications. A few protocols have been proposed for frequency allocation in such networks; however, they do not address the problem end-to-end. In this paper, we present a general formulation of the channel selection problem, taking into account the performance of both mesh access and mesh backhaul. Moreover, we propose a routing-aware channel selection protocol for wireless mesh networks (ARACHNE). ARACHNE is distributed in nature and motivated by our measurements on a wireless testbed. The main novelty of our protocol comes from adopting a metric that captures the end-to-end link loads across different routes in the network. ARACHNE prioritises the assignment of low-interference channels to links that (i) need to serve high-load aggregate traffic and/or (ii) already suffer significant levels of contention and interference. Our protocol takes into account the number of potential interfaces (radios) per device and allocates these interfaces in a manner that efficiently utilises the available channel capacity. We evaluate ARACHNE through extensive, trace-driven simulations, and we show the approaches to the optimal channel selection. We observe that our protocol improves the total network throughput, as compared to three other representative channel allocation approaches in literature.

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Traffic-Aware Channel Assignment in Enterprise Wireless LANs

Cited by 64 publications

References 15 publications

QoS provisioning for large-scale multi-ap WLANs

QoS provisioning for large-scale multi-ap WLANs

Partially overlapping channel assignment for WLANs using SINR interference model

Dynamic frequency management in 802.11‐based multi‐radio wireless networks

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