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TETRA Luas Light Rail System Tony McEvoy Railway Procurement Agency April 2005 Railway Procurement Agency State Agency 110 Employees Responsible for procurement of Light Rail and Metro Infrastructure for Dublin Recently completed delivery of the first phase of the Luas Light Rail System

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tony mcevoy railway procurement agency

TETRALuas Light Rail System

Tony McEvoy

Railway Procurement Agency

April 2005

railway procurement agency
Railway Procurement Agency
  • State Agency
  • 110 Employees
  • Responsible for procurement of Light Rail and Metro Infrastructure for Dublin
  • Recently completed delivery of the first phase of the Luas Light Rail System
luas system outline
Luas - System Outline
  • Line A – 15km., Line B – 9km.
  • Light Rail Vehicles – Citadis – 40 no.
  • Mixture On-street/Off-street running.
  • Central Control Room at Red Cow Depot
  • Total cost €775m
  • Line B (Green Line) opened 30 June 2004
  • Line A (Red Line) opened 28 September 2004
radio key functions
Radio Key Functions
  • Safety and emergency management – risks associated with reintroducing electrified railway into heart of Dublin; tram interaction with other road users.
  • Service – operational performance & reliability.
luas radio users audio
Luas Radio Users (Audio)
  • Central Control Room (CCR) Operators
  • Tram Drivers
  • Tram Passengers (on board PA)
  • Operations/Line Managers
  • Ticket Inspectors
  • Rolling Stock and Infrastructure Maintenance Personnel
  • Safety & Incident Managers
luas radio users data
Luas Radio Users (Data)
  • Automatic Vehicle Location System (AVLS) Localisation messages from trams
  • Download of timetable service files to trams
  • Real-time transfer of timetable adherence performance and headway messages to tram driver’s console
  • Facility for alphanumeric text messages between CCR and tram drivers
luas radio key requirements
Luas Radio Key Requirements
  • High quality, reliable, resilient & secure transmission coverage over entire Luas network.
  • Accommodate both voice and data channels.
  • Facilitate both private and group calls
  • RTS type access (no dialling) with near-zero call set up times.
  • Have Press-To-Talk (PTT) type dialogues with other radio users, i.e. no full duplex speech.
  • Provide for Emergency call facilities (pre-emption)
radio technology choice
Radio Technology Choice
  • Radio system part of overall Design & Build type contract for Luas infrastructure construction.
  • Functional Requirements Specification with technology type left to market to decide.
  • Of the four consortia that bid for the Luas Design & Build contract, three proposed a TETRA solution.
tetra positives
TETRA Positives
  • Excellent match with Luas key requirements
  • Digital quality and performance
  • Solid platform for future growth

TETRA Negatives (2000/2001 View)

  • New technology – wary of being guinea-pig
  • Perceived health & safety PR implications
luas service requirements
Luas Service Requirements
  • “Track Route” – 50m either side of track
  • “Operational Area” – 1.5km from track
  • On board Tram mobiles:

-100% coverage with depots, shunting zones and along entire track route.

  • Handportables:

-100% coverage with depots, at Stops & within Park & Ride car parks

- Min 90% coverage along remainder of track route (99.56% achieved)

  • Motor Vehicle mobiles:

- 100% coverage with depots, at Stops & within Park & Ride car parks

- Min 90% coverage within operational area (99.92% achieved)

luas tetra system components
Luas TETRA System Components
  • Motorola Dimetra-P Release 3.8
  • Master Switching Centre (MSC) at Red Cow Depot
  • 4 Remote EBTS Base Stations, each with two transceivers (10W)
  • 80 MTM700 Mobiles for on board trams, 2 per tram (3W)
  • 60 MTP700 Handportables (1W)
  • 14 MTM700 Mobiles for Motor Vehicles (3W)
luas msc interfaces
Luas MSC Interfaces
  • CCR LAN (API for CCR Workstations / AVLS Servers)
  • Elite Dispatch Console
  • Full Vision Network Management Terminal
  • Zone Manager Local User Terminal
  • Telephone Interconnect Gateway to Luas PABX
  • X21 128kbits to each EBTS Base Station
slide18
Red Cow

Base Station

  • Antenna Height 30m
  • EBTS beside monopole base
slide19
Liberty Hall Base Station
  • Antenna Height 53m
  • EBTS located on 17th floor under canopy
slide20
Taney Bridge Base Station
  • Antenna Height 40m
  • EBTS under bridge deck beside A frame
slide21
Hospital Stop Base Station
  • Antenna Height 10m
  • EBTS in nearby trackside Stop Cubicle
slide22
Tram Driver’s Cab
  • Handset in desk
  • Dual function console (AVLS/radio)
  • Emergency footpedal under desk
  • Hidden microphone & loudspeaker in roof
antennas
Antennas
  • Base Stations: Sigma Wireless Autorouter. 7/8” foam heliax feeder.
  • Mobiles: Low profile LHA roof antennas on board trams
  • Handportables: Small whip type allowing for typical body losses on belt
avls data over tetra
AVLS Data Over TETRA
  • Used Short Data Transfer Service as bearer rather than PDS Packet Data Service
  • Avoided developing API for PDS
  • Timetable service files split to enable SDTS transmission
implementation
Implementation
  • Coverage at Sandyford depot – resolved by adjustment of Taney Bridge antennas
  • Interference on tram driver’s handset when tram accelerating or braking
  • All resolved resulting in high quality, high reliability and successful operational system