Mobile Radio Services For Urban Transport
Author(s)
C. Bantin
Abstract
Mobile IP networks, using wireless LAN (WLAN) technology, have recently
been successfully deployed for communications based train control (CBTC)
applications. Packet transmission networks are well suited to the data
communications requirements of CBTC, and WLANs, using universal data
packet (UDP) transmission, a simple send and forget protocol, are ideally suited
for this task. Moreover, the 802.11 family of WLAN radio standards allows for
several megabits per second of data transmission, whereas automatic control
applications require at most 10 to 20 kb/s data links. This leaves ample capacity
for carrying additional data to and from transit vehicles, and opens up the
possibility of providing additional data services. Transit operators are becoming
increasingly interested in utilizing this extra capacity for CCTV, voice and
emergency response services. WLAN radios can carry varying amounts of data
for these additional services from one CCTV signal plus voice and data for basic
802.11, to several high-quality video signals and voice circuits for 802.11g
systems.
1 Introduction
Within the past two years, two urban transport rail systems have gone into
revenue service using radio-based communications to support automatic train
control (ATC) operations with driverless trains. The first is the Las Vegas
monorail [1] and the second is the Disney Resort Line in Hong Kong. These are
the first such revenue systems in the world to utilize radio for their ATC
operation. The radio networks are based on the IEEE 802.11 [2–4] WLAN
standards for communication between the trains and the wayside.
CBTC systems have a modest requirement for data rate but stringent
requirements for availability and delay. The ATC equipment will communicate
with each train by polling it and expecting a response within a certain amount of
Keywords
Related Book
Other papers in this volume
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