IEEE 802.11a performance for infrastructure-to-train communications in an underground tunnel

Kassab, Mohamed; Wahl, Martine; Casanova, Maurício; Berbineau, Marion; Aguado, Marina

doi:10.1109/itst.2009.5399313

Cited by 1 publication

(4 citation statements)

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“…A couple of approaches for the latter are to measure signal quality (e.g. by means of Received Signal Strength Indicator (RSSI)) from the beacon frames received from an AP, and to measure how consist the signal quality is, by monitoring the frame reception rate [29]. If more than one potential APs are found for the new connection, the same criteria is used to select the best AP among them.…”

Section: B Roaming Algorithmmentioning

confidence: 99%

“…curves, elevations, slopes, obstructions, etc., and the transmission power used [39]. A study of CBTC installations show that an inter-AP distance of 200-300 meters is more common, however greater distances of more than 350 meters have also been seen [20], [27]- [29], [34], [37], [63], [96]. One example is the Copenhagen S-train CBTC where an inter-AP distance of approximately 600 meters has been used.…”

Section: A Inter-ap Distancementioning

confidence: 99%

“…Modeling propagation loss in tunnels is therefore more complex compared to open-air locations, and advanced propagation models are continuously being developed [29], [106]- [108]. Part of the problem is that carrying propagation loss measurements in tunnels is problematic, as they cause inconvenience for normal traffic [107].…”

Section: A Inter-ap Distancementioning

confidence: 99%

“…As with other real-time applications, when designing a radio communication system for CBTC, UDP is preferred over Transmission Control Protocol (TCP) as the transport layer protocol [29]. Since CBTC control messages are sent at short intervals, lost, delayed or erroneous packets are generally not critical.…”

Section: User Datagram Protocol (Udp) As Transport Protocolmentioning

confidence: 99%

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

Farooq

Soler

2017

IEEE Commun. Surv. Tutorials

111

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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%