Radio CBTC For The Las Vegas Monorail
Author(s)
C. Bantin & J. Siu
Abstract
In July 2004, the Las Vegas Monorail entered revenue service with a
revolutionary new radio communication-based train control system (CBTC). The
radio system is the world’s first application of wireless technology in a
revenue-earning urban rail transit system using antennas and over-the-air
transmission. The system has performed perfectly and is a testament to the
application of sophisticated technology to a challenging environment. The entire
data communications system (DCS) serving the CBTC is based on the Ethernet
802.3 open-standard. The radio segment uses the 802.11 extension of this
standard to mobile networks. Specifically the 802.11 frequency hopping spread
spectrum (FHSS) variant is used because it has the best resistance to interference
while providing more than adequate data rates. The entire network was designed
and built using commercial off-the-shelf equipment, where the 802.11 standard
has been implemented for mobile networks capable of routine hand-overs
between access points at up to 100 km/h. The system design, using the standard
in the 2.4 GHz ISM band, involved several detailed stages to ensure faultless
operation. First the nature of the CBTC data has to be understood and the
network has to be designed to accommodate this data. Next the link budgets have
to be determined as applied to the unique guideway environment used by the
monorail. Signal strength surveys were carried out to determine where to place
access points such that there was full and redundant coverage throughout the
guideway. Furthermore severe co-user interference (802.11b or WiFi) is present
at several locations along the guideway and had to be accommodated. Finally the
operating parameters of the radios had to be fully understood to optimize the
hand-over process. The complete system was extensively tested and many weeks
of data was collected in order to verify that the radio system met the performance
requirements.
Keywords: radio CBTC, ATC, driverless, monorail.
Keywords
radio CBTC, ATC, driverless, monorail.
Related Book
Other papers in this volume
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