Enhanced schemes for L2 handover in IEEE 802.11 networks and their evaluations

Montavont, Julien; Montavont, Nicolas; Noël, Thomas

doi:10.1109/pimrc.2005.1651681

Cited by 23 publications

(17 citation statements)

References 4 publications

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“…Often a sort of background passive scanning is employed where the node learns about the next available APs while still connected to the current AP [86]. The authors in [36] propose a similar solution, called "frequency combination algorithm", which actively scans for as many as four neighboring APs as the train moves to create a "neighbor graph".…”

Section: B Roaming Algorithmmentioning

confidence: 99%

Radio Communication for Communications-Based Train Control (CBTC): A Tutorial and Survey

Farooq

Soler

2017

IEEE Commun. Surv. Tutorials

106

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Abstract-Over the last decade, railway industry has seen a huge transition from conventional railway signalling systems to modern, communication-based signalling systems. Communications-Based Train Control (CBTC) is a modern communication-based system that uses radio communication to transfer timely and accurate train control information. CBTC is the choice of mass-transit railway operators today, with over a hundred systems currently installed worldwide. The safetyrelated, time-critical applications such as train control impose stringent reliability and availability requirements on the radio communication technology used. IEEE 802.11 Wi-Fi, despite being originally developed for stationary users within a limited area, has prevailed as the de-facto radio technology for CBTC. Unfortunately, very limited literature is publicly available on this topic due to the highly competitive nature of the railway industry. We believe that this paper fills the much-needed gap. It aims to present a comprehensive tutorial, as well as a survey of the stateof-the-art, of CBTC and the role of radio communication in it. The operation and fundamental components of a CBTC system are discussed. A summary of the evolution of the communication technologies used for modern railway signalling is presented. The benefits and drawbacks of using a radio communication technology, particularly Wi-Fi, and the challenges it introduces, are discussed. Best practices in the design of a CBTC radio network and the measures to optimize its availability are discussed, while using the currently in-progress Copenhagen Strain CBTC project as a reference. An overview of the CBTC standardization efforts, as well as the IEEE CBTC standardfrequently overlooked due to its limited scope-is included. The paper is concluded by providing a number of potential directions for future work.

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Section: B Roaming Algorithmmentioning

confidence: 99%

Radio Communication for Communications-Based Train Control (CBTC): A Tutorial and Survey

Farooq

Soler

2017

IEEE Commun. Surv. Tutorials

106

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“…Several approaches have been proposed to reduce or even eliminate the impact of the scanning phase during handover. Montavont et al [6] proposed an optimization to this process by performing short interleaved scanning phases with on-going data communication. In SyncScan [7], Ramani and Savage investigated a modification of the infrastructure where the APs synchronously broadcast beacon frames on the same channel so that the MS just needs to switch the channel and wait for a short period to retrieve the available APs.…”

Section: Related Workmentioning

confidence: 99%

“…Because of beacon loss, scanning can miss an available AP, especially in dense deployments, like those discuses in [11,12]. To overcome this issue, a solution is to use repeated multiple scans, split into short interleaved scanning phases as described in [6]. However, this approach is not applicable to vehicular communications, as the sensed values become rapidly obsolete because of the relatively high velocity.…”

Section: Related Workmentioning

confidence: 99%

Enabling vehicular mobility in city-wide IEEE 802.11 networks through predictive handovers

Mouton

Castignani

Frank

et al. 2015

Vehicular Communications

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The increasing number of IEEE 802.11 networks deployed worldwide gives mobile users the possibility of experiencing high-speed wireless access on the move. Moreover, the high density of these deployments in urban areas make IEEE 802.11 a suitable access technology for moving vehicles. However, in order to provide a seamless access to vehicles, the transition between Access Points (APs) must be quick and reliable. The main bottleneck of existing handover mechanisms is the long AP scanning process, which only provides a snapshot of the available networks at a given location, impacting the handover decision on moving vehicles. To overcome this limitation, we propose coper, a context-based predictive handover mechanism that considers vehicle's trajectory, road topology, and network deployment information to decide the best handover location and candidate access points. We validate with real experiments in a city-wide 802.11 network and show that coper can provide better average signal strength, data rate, and connected time than other existing handover approaches.

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“…Most authors assume a regular WLAN with several APs operating on various frequencies and a relatively slow mobility amongst the MNs. In [20], Montavont et al present the idea of periodic scanning, where an MN performs scans for possible new APs already while it is still connected with good channel quality to an AP. Short probes sent out on varying channels interfere with the ongoing data traffic but, on the other hand, the MN is ready for the handover execution phase as soon as the need for a handover arises.…”

Section: Related Researchmentioning

confidence: 99%

Real-Time Communication Support for Cooperative, Infrastructure-Based Traffic Safety Applications

Böhm

Jönsson

2011

International Journal of Vehicular Technology

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The implementation of ITS (Intelligent Transport Systems) services offers great potential to improve the level of safety, efficiency and comfort on our roads. Although cooperative traffic safety applications rely heavily on the support for real-time communication, the Medium Access Control (MAC) mechanism proposed for the upcoming IEEE 802.11p standard, intended for ITS applications, does not offer deterministic real-time support, that is, the access delay to the common radio channel is not upper bounded. To address this problem, we present a framework for a vehicle-to-infrastructure-based (V2I) communication solution extending IEEE 802.11p by introducing a collision-free MAC phase assigning each vehicle an individual priority based on its geographical position, its proximity to potential hazards and the overall road traffic density. Our solution is able to guarantee the timely treatment of safety-critical data, while minimizing the required length of this real-time MAC phase and freeing bandwidth for best-effort services (targeting improved driving comfort and traffic efficiency). Furthermore, we target fast connection setup, associating a passing vehicle to an RSU (Road Side Unit), and proactive handover between widely spaced RSUs. Our real-time MAC concept is evaluated analytically and by simulation based on a realistic task set from a V2I highway merge assistance scenario.

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Enhanced schemes for L2 handover in IEEE 802.11 networks and their evaluations

Cited by 23 publications

References 4 publications

Radio Communication for Communications-Based Train Control (CBTC): A Tutorial and Survey

Radio Communication for Communications-Based Train Control (CBTC): A Tutorial and Survey

Enabling vehicular mobility in city-wide IEEE 802.11 networks through predictive handovers

Real-Time Communication Support for Cooperative, Infrastructure-Based Traffic Safety Applications

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