Fault tolerance in IEEE 802.11 WLANs

Deus, Flávio Elias Gomes de; Puttini, Ricardo Staciarini; Molinaro, Luis Fernando Ramos; Abdalla, Humberto; Nze, Georges Daniel Amvame; Kabara, Joseph

doi:10.1109/its.2006.4433349

Cited by 4 publications

(5 citation statements)

References 11 publications

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“…Both of them would cause high interference level (i.e., an AP interferes with more clients served by other APs), which may fail the bandwidth constraint in ineq. (1). Through the above analysis, the APs with proper transmission power which serve more clients while causing low interference should firstly considered to be placed.…”

Section: Greedy Methodsmentioning

confidence: 99%

“…The chosen AP will adjust its transmission power to guarantee the successful data transmission to this client. After the reconfiguration of the system, we check if maximal collision load of the system violate the bandwidth constraint (1). In deed, this checking procedure is also used in the fault response of any one AP failure.…”

Section: Fault Tolerance Checking Proceduresmentioning

confidence: 99%

“…2) In the access point failure case, we guarantee an acceptable bandwidth for each client by reconfiguring the system. 3) Our deployment strategy can ensure tolerance to AP failures in the construction phase, not like other works by adding more APs to tackle it [1].…”

Section: Introductionmentioning

confidence: 99%

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QoS Access Points Placement with Fault Tolerance in Wireless Local Area Networks

Chen

Liang

2013

AMR

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In this paper, we study the problem of enhancing the fault tolerance of IEEE 802.11 wireless local area networks in the design stage. We aim to settle proper number of access points (APs) and carefully locate them, such that the system can tolerate AP failures while guaranteeing QoS requirement. Given a set of clients (end-users), each client has a traffic demand for Internet access. The problem of our concern is to find out the minimal number of access points and proper location, such that the fault tolerance and QoS constraint are both satisfied. That is, when there is no AP failure, the actual traffic delivery ratio for each client shall exceed the threshold. When their happens that one AP failed, the clients it served can switch to other APs with reconfiguration of the system, while providing an acceptable bandwidth. We proposed a heuristic algorithm, firstly we place one AP in each candidate place and gradually decrease the APs until no more APs can be deleted, in each step we make fault tolerance checking. Our proposed method can effectively solve the problem of tolerating to access point failure in the design phase of wireless local area networks. Simulations are conducted to show the performance of our proposed method.

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Section: Greedy Methodsmentioning

confidence: 99%

Section: Fault Tolerance Checking Proceduresmentioning

confidence: 99%

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QoS Access Points Placement with Fault Tolerance in Wireless Local Area Networks

Chen

Liang

2013

AMR

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“…The work in [8] and [9] focused on the problem of overcoming these APs' failure working with reconfiguration of the 978-1-4244-9268-8/11/$26.00 ©2011 IEEE remaining APs by changing parameters such as power level and frequency channels. And they both proposed a two-phase method-design phase and fault response phase-to solve this problem.…”

Section: Related Workmentioning

confidence: 99%

“…And they both proposed a two-phase method-design phase and fault response phase-to solve this problem. But in [8], the system needs to add more APs in the case where no feasible network configuration can be found. Our proposed method solves this problem by careful selection of APs to tolerate any AP failure in the design stage.…”

Section: Related Workmentioning

confidence: 99%

Fault Tolerant AP Placement with QoS Constraint in Wireless Local Area Networks

Zhou

Jia

Xie

et al. 2011

2011 IEEE Global Telecommunications Conference - GLOBECOM 2011

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In this paper, we study the problem of enhancing the fault tolerance of IEEE 802.11 wireless local area networks in the design stage. Our goal is to place minimal number of APs (access points), such that the system can tolerate AP failures while guaranteeing QoS requirement. Given a set of clients (endusers) in a region, each client has a traffic demand for Internet access. Our concern is to find out minimal number of APs and their locations, so that both fault tolerance and QoS constraints can be satisfied. That is, when there is no AP failure, all clients' traffic demands should be met. When one AP fails, the clients it serves shall switch to other APs and a certain percentage of traffic demands of these clients affected shall still be met. We proposed a heuristic algorithm to solve this problem. Firstly we place minimal number of APs to ensure that connection requirements and per-client degrading traffic demand can be met. Secondly, we continue to add APs to meet per-client normal traffic demand. Finally, we place more APs to tolerate failure of the APs placed in the first step. Simulation are conducted to show the performance of our proposed method.

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