An Asynchronous Distributed Dynamic Channel Assignment Scheme for Dense WLANs

Drieberg, Micheal; Zheng, Fu-Chun; Ahmad, Rizwan; Olafsson, S.

doi:10.1109/icc.2008.475

Cited by 16 publications

(21 citation statements)

References 5 publications

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“…In other words, all the APs are now allowed to perform the algorithm and channel switching asynchronously. Results in [2] show that our proposed scheme not only converges significantly faster and requires less channel switches, but also achieves better throughput in dynamic load environments.…”

Section: Introductionmentioning

confidence: 90%

“…In an earlier work, we proposed an asynchronous, distributed and dynamic channel assignment scheme in [2], which improves on the work by Lou and Shankaranarayanan in [3]. Our proposed scheme has the following key features: (1) simple to implement, (2) does not require any knowledge of the throughput function (i.e.…”

Section: Introductionmentioning

confidence: 91%

“…Our proposed scheme has the following key features: (1) simple to implement, (2) does not require any knowledge of the throughput function (i.e. saturation throughput as a function of the number of nodes [4,5]), and (3) allows asynchronous channel switching by each AP.…”

Section: Introductionmentioning

confidence: 99%

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Effectiveness of Asynchronous Channel Assignment Scheme in Heterogeneous WLANs

Drieberg

Zheng

Ahmad

et al. 2009

2009 4th International Symposium on Wireless Pervasive Computing

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Due to their popularity, dense deployments of wireless local area networks (WLANs) are becoming a common feature of many cities around the world. However, with only a limited number of channels available, the problem of increased interference can severely degrade the performance of WLANs if an effective channel assignment scheme is not employed.Previous studies on channel assignment in WLANs almost always assume that all access points (AP) employ the same channel assignment scheme which is clearly unrealistic. On the other hand, to the best of our knowledge, the interaction between different channel assignment schemes has also not been studied before. Therefore, in this paper, we investigate the effectiveness of our earlier proposed asynchronous channel assignment scheme in these heterogeneous WLANs scenarios. Simulation results show that our proposed scheme is still able to provide robust performance gains even in these scenarios.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 91%

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Effectiveness of Asynchronous Channel Assignment Scheme in Heterogeneous WLANs

Drieberg

Zheng

Ahmad

et al. 2009

2009 4th International Symposium on Wireless Pervasive Computing

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“…Therefore, if f T (n)/n is a monotonically decreasing function, the maximization in (2) can now be rewritten as [10] max ( ) arg max ( ) ( ) = arg max ( ( ) ( )) ( ) ( ) arg min ( )…”

Section: Minimum Neighbour With Extended Kalman Filter Estimator mentioning

confidence: 99%

Minimum neighbour with extended Kalman filter estimator (MINEK): Performance evaluation

Drieberg

Zheng²,

Ahmad

2011

2011 6th International ICST Conference on Communications and Networking in China (CHINACOM)

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The recent emergence of high density wireless local area network (WLAN) deployments is a testament to both the insatiable demands for wireless broadband services and the ubiquity of WLAN technology. However, the increased capacity and extended coverage comes with a corresponding increase in contention and interference. These can cause a significant degradation in throughput unless an effective channel assignment scheme is employed.In an earlier work, we proposed a practical distributed channel assignment scheme for high density WLANs. The proposed minimum neighbour with extended Kalman filter estimator (MINEK) scheme maximizes throughput by selecting the channel with the minimum number of active neighbour nodes (nodes associated with interfering access points). The latter is estimated in-situ using an extended Kalman filter. In this paper, we present extensive performance evaluation of the MINEK scheme. Specifically, the scheme's performance is evaluated in terms of upper-bound performance, normalized density, non-saturated load, unequal load, fairness and scalability. Extensive packet-level simulations using OPNET have shown that the MINEK scheme not only provides significant throughput improvement when compared to other existing schemes but is also highly robust across various deployment scenarios.

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“…Fitness function (15) is based on the objective function of the problem defined by equations (4) to (7). Another way is to define the fitness function based on the objective function of the problem defined by equations (8) to (11).…”

Section: B Genetic Algorithm Approachmentioning

confidence: 99%

Feasibility Study of Video Distribution over WLANs in Dense Deployment

Liu

Mandrekar

et al. 2010

2010 IEEE International Conference on Communications

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emerging technologies such as orthogonal frequency division multiplexing (OFDM) and multiple in multiple out (MIMO) has significantly increased the bandwidth of a wireless channel. A potential application of these technologies is to distribute digital video content over wireless in a home environment. However, video streaming is bandwidth demanding, and the number of interference free wireless channels is limited, selecting the best operating channel is critical to guarantee the quality of viewers experience. We study the feasibility of transmitting video over WLANs in a multi-dwelling unit environment; design a centralized channel selection algorithm that satisfies each clients demand, at the same time, takes the fairness and residual bandwidth into consideration. We use directed edge-weighted graph to model the interference between different basic service systems and classify APs into cooperative APs and non cooperative APs. Our simulation results show that using existing 802.11a channels, a feasible channel allocation scheme for video streaming over WLANs in a dense deployment can be found in most cases.

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An Asynchronous Distributed Dynamic Channel Assignment Scheme for Dense WLANs

Cited by 16 publications

References 5 publications

Effectiveness of Asynchronous Channel Assignment Scheme in Heterogeneous WLANs

Effectiveness of Asynchronous Channel Assignment Scheme in Heterogeneous WLANs

Minimum neighbour with extended Kalman filter estimator (MINEK): Performance evaluation

Feasibility Study of Video Distribution over WLANs in Dense Deployment

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