Decentralized access point selection architecture for wireless LANs -deployability and robustness

Yukuda, Y.; Oie, Yuji

doi:10.1109/vetecf.2004.1400192

Cited by 37 publications

(46 citation statements)

References 8 publications

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“…In [13], authors proposed a decentralized AP selection strategy to achieve a load balancing among the APs by exploiting the packet error rate that can be obtained from the RSS. However, this strategy only considers TCP traffic and it requires a slight modification in both MN and AP.…”

Section: Existing Studies Of Handover Strategymentioning

confidence: 99%

Handover Management for VoWLAN Based on Estimation of AP Queue Length and Frame Retries

Niswar

Kashihara

Tsukamoto

et al. 2009

IEICE Trans. Inf. & Syst.

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SUMMARYSwitching a communication path from one Access Point (AP) to another in inter-domain WLANs is a critical challenge for delaysensitive applications such as Voice over IP (VoIP) because communication quality during handover (HO) is more likely to be deteriorated. To maintain VoIP quality during HO, we need to solve many problems. In particular, in bi-directional communication such as VoIP, an AP becomes a bottleneck with the increase of VoIP calls. As a result, packets queued in the AP buffer may experience a large queuing delay or packet losses due to increase in queue length or buffer overflow, thereby causing the degradation of VoIP quality for the Mobile Nodes (MNs) side. To avoid this degradation, MNs need to appropriately and autonomously execute HO in response to the change in wireless network condition, i.e., the deterioration of wireless link quality and the congestion state at the AP. In this paper, we propose an HO decision strategy considering frame retries, AP queue length, and transmission rate at an MN for maintaining VoIP quality during HO. Through simulation experiments, we then show that our proposed method can maintain VoIP quality during HO by properly detecting the wireless network condition. key words: handover, AP queue length, frame retries, transmission rate, VoIP, multi-rate WLAN

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Section: Existing Studies Of Handover Strategymentioning

confidence: 99%

Handover Management for VoWLAN Based on Estimation of AP Queue Length and Frame Retries

Niswar

Kashihara

Tsukamoto

et al. 2009

IEICE Trans. Inf. & Syst.

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“…As suggested in several previous works (e.g., [30], [22], [17], [5], [8]), one approach to addressing the load imbalance issue is to incorporate the APs' load into the association scheme. For example, Papanikos and Logothetis [30] determine client and AP association based on RSSI and the number of clients associated with each AP.…”

Section: Related Workmentioning

confidence: 99%

“…For example, Papanikos and Logothetis [30] determine client and AP association based on RSSI and the number of clients associated with each AP. The authors in [22], [17] propose that APs maintain a measurement of their load and broadcast beacons containing this load to clients in the cell. New clients receive beacons from multiple APs and use this information to associate with the least loaded AP [22], [17].…”

Section: Related Workmentioning

confidence: 99%

“…The authors in [22], [17] propose that APs maintain a measurement of their load and broadcast beacons containing this load to clients in the cell. New clients receive beacons from multiple APs and use this information to associate with the least loaded AP [22], [17]. Balachandran et al suggest that clients associate with the AP that can accommodate its minimum bandwidth requirement [5].…”

Section: Related Workmentioning

confidence: 99%

“…A client associates with the AP that is lightly loaded and whose beacons have the highest RSSI values. This technique and its different variants have been proposed by researchers (e.g., [5], [8], [17], [22], [30]) and adopted by vendors of wireless LAN products [1], [11], [28]. The problem is that this technique requires support from both APs and clients.…”

Section: Introductionmentioning

confidence: 99%

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Cell Breathing in Wireless LANs: Algorithms and Evaluation

Bahl

Hajiaghayi

Jain

et al. 2007

IEEE Trans. on Mobile Comput.

105

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Abstract-Wireless LAN administrators often have to deal with the problem of sporadic client congestion in popular locations within the network. Existing approaches that relieve congestion by balancing the traffic load are encumbered by the modifications that are required to both access points and clients. We propose Cell Breathing, a well-known concept in cellular telephony, as a load balancing mechanism to handle client congestion in a wireless LAN. We develop power management algorithms for controlling the coverage of access points to handle dynamic changes in client workloads. We further incorporate hand-off costs and manufacturer specified power level constraints into our algorithms. Our approach does not require modification to clients or to the standard. It only changes the transmission power of beacon packets and does not change the transmission power of data packets to avoid the interactions with autorating. We analyze the worst-case bounds of the algorithms and show that they are either optimal or close to optimal. In addition, we evaluate our algorithms empirically using synthetic and real wireless LAN traces. Our results show that cell breathing significantly outperforms the commonly used fixed power scheme and performs at par with sophisticated load balancing schemes that require changes to both the client and access points.

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Access point selection strategy in IEEE802.11E WLAN networks toward load balancing

Takeuchi¹,

Sezaki

Yasuda

2006

Electron. Comm. Jpn. Pt. I

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SUMMARYIEEE802.11 WLAN (Wireless LAN) has been widely used in enterprises and public spaces such as airports. In these large WLAN networks, RRM (Radio Resource Management) is necessary for efficient use of radio resources, and also load balancing among APs (Access Point) has to be taken into account. Since, in IEEE802.11, STA (Station) has the right to select an AP with which it will associate, the AP selection mechanism implemented in STA is important for load balancing. This paper proposes an association mechanism called HRFA (High-Rate First Association) in order to achieve load balancing and efficient use of radio resources. Furthermore, IEEE802.11e was developed by Task Group E of the IEEE802.11 working group and specified a MAC protocol to provide QoS in the MAC layer and to support real-time traffic over WLAN. In order for WLAN to be more widely used, the functionalities of IEEE802.11e must be provided in WLAN devices. Our proposed HRFA can be applied to WLANs compliant with IEEE802.11e. Since the HRFA can be implemented without any modifications in the IEEE802.11 and IEEE802.11e standards, it is useful from the implementation-cost and compatibility point of views. Simulation results show that HRFA can efficiently utilize radio resources and can also achieve load balancing in IEEE802.11e WLAN networks.

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Decentralized access point selection architecture for wireless LANs -deployability and robustness

Cited by 37 publications

References 8 publications

Handover Management for VoWLAN Based on Estimation of AP Queue Length and Frame Retries

Handover Management for VoWLAN Based on Estimation of AP Queue Length and Frame Retries

Cell Breathing in Wireless LANs: Algorithms and Evaluation

Access point selection strategy in IEEE802.11E WLAN networks toward load balancing

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