The first TETRA System in India
A Brief by-
PRASHANT RAO
Chief Communication Engineer
DMRC
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Delhi – the need for a mass rapid transit
system
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As cities grow in size, the number of vehicular trips on road
system goes up. This necessitates a pragmatic policy shift to
discourage private modes and encourage public transport.
•
Delhi has experienced phenomenal growth in population in the
last few decades. Its population has increased from 57 lakhs
(5.7M) in 1981 to > 120 lakhs (12 M) presently.
•
For want of an efficient mass transport system, the number of
motor vehicles has increased from 5.4 lakhs (540k) in 1981 to
40 lakhs (4M) by now.
•
The number of motor vehicles in Delhi is now more than that of
Mumbai, Calcutta, Chennai put together. The result is extreme
congestion on Delhi roads, ever slowing speeds, increase in road
accidents fuel wastage and environmental pollution with
motorized vehicles alone contributing to about two thirds of the
atmospheric pollution.
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Delhi Metro Rail Corporation
• To rectify this situation the
Government of India and the
Government of National Capital
Territory of Delhi, set up a
company named Delhi Metro Rail
Corporation Ltd.
• DMRC was then given a mandate
to construct >50 kms of Metro Rail
tracks in Delhi by 2005.
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• Work on Phase I started in 1998
• First section between Shahdara and Tis Hazari
was opened on 24th Dec 2002. ( ~8 Km)
• Now ~55 km operational in total.
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Delhi Metro
•
Line I ( Shahdara – Rithala) ~22 km
– Line I ( Shahdara – Rithala) was made operational for
commercial services in three stages:
• Shahdara – Tis Hazari : with effect from 25th Dec, 2002
• Tis Hazari – Inderlok : with effect from 4rd Oct, 2003
• Inderlok – Rithala : with effect from 1st April, 2004
• Line II ( Vishwavidyalaya – Central Secretariat) ~11 km
– Vishwavidyalaya – Kashmere Gate: with effect from 20th
December, 2004.
– Kashmere Gate – Central Secretariat : w.e.f 3rd July, 2005.
• Line III ( Barakhamba – Dwarka Sub City ) ~ 23 Km
– Barakhamba Road- Dwarka Section: w.e.f 31 Dec,2005
• Extension of Line III – on-going
– Extension into Dwarka sub-city
– Barakhamba Road- Indraprastha Extension
MOTOROLA and the Stylized M Logo are registered in the US Patent & Trademark Office.
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MOTOROLA and the Stylized M Logo are registered in the US Patent & Trademark Office.
All other product or service names are the property of their respective owners. © Motorola, Inc. 20XX.
Telecommunication Systems
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Fibre Optics –SDH/Access
Radio System-TETRA
Centralised CCTV
Centralised Public address
Centralised Display Systems
SCADA System
Centralised Master Clock System
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Radio System
•Train to Controller Communication
•Operations & Maintenance Personnel
•Security Staff
PMR Technologies
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MPT 1327
Iden- (Motorola’s Proprietary)
ASTRO- (Motorola’s Proprietary)
EDACS – (Ericsson’s Proprietary)
APCO25-Digital/Analog FDMA
TETRA-Digital TDMA-True Open Standard
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Why TETRA
• TETRA was selected as the radio technology for the following
reasons:
– Open Standards
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Guaranteed minimum performance.(~ 500 ms Setup time)
Provides evolutionary growth.
Sourcing from more than one vendor.
Competitive pricing.
– Frequency Efficient.
– Integrated voice and data.
– Site Trunking & DMO
• TETRA will safeguard DMRC’s investment for the next 15 years.
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DMRC Radio System
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Digital Trunked Radio System operating in
380-400MHz conforming to ETSI TETRA
standard
Calling of Train by Train Identity Number
(TID)
Customized GUI Screen for Dispatch Operator
Train Radio Control Panel for train drivers
Interfaces to other Telecommunication
Subsystems such as FOTS (fibre optic
transmission system), PA (public address),
EPABX and TC&S (Train control & Signalling).
Alcatel (Line 1&2) and Siemens (Line 3)
supplied the telecommunication system
including the radio system.
Motorola was selected as the sub-supplier
to provide the TETRA integrated digital
radio system for all the Lines uptill now..
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System Sizing
• The scope of work executed includes:
– Central Network Equipment(SwMi) at Master Site
– 11 x Radio Base Stations ( +4 More Under
Commissioning)
• 2 Base Radios per site
– 8 x Customized GUI Dispatchers
– 50 x 2 Trainborne Mobile Radios
• Mobile Radio, Train Control Interface, Radio Control
Panel
– 55 Fixed Radios
• Standard Mobile Radio installation
– 500 Portable Radio
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DMRC TETRA CONFIGURATION
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Radio
Group A
Zetron
Model
390
Group B
Group X
Hand portable Groups
OCC
RCW Equipment
ATS
Input
RCW
Server
Station Equipment
TETRA
Infrastructure
RCW
Console
RCW
Console
Trainborne Equipment
Radio
Radio
TRIU
TRCP
RCW
Console
ATS
Input
Zetron
Model
390
Zetron (RAU) for:
• CC •ACC
•ASC •SC
•RSC •FC
Other
Data
System
Depot RCW
Console
Portable
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Radio
Zetron
Model
390
Radio CNE
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Radio Dispatch Sub-system
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The radio dispatch application was customized according to DMRC’s
operational requirements.
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The development of application is based on Application Program Interfaces
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The required functionalities are performed from the customized GUI of the
dispatch terminals. Key functions include:
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Calling of trains by their assigned Train Identity Number or RakeID
Full duplex private calls between Dispatcher and Train Drivers.
PA announcement to trains from Dispatcher at OCC.
Etc.
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Radio Dispatcher
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Radio Dispatcher
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Dispatcher – Train Table View
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Train Cab Radio
Radio
Panel
Display
Handset
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Trainborne Radio Equipment Architecture
TRIU
MR
MR
CPU
TRIU
CPU
TRCP
TRCP
I/O
I/O
DC/DC
DC/DC
Fall Back Link
•Trainborne Radio Equipment consists of
Mobile Radio
Train Radio Control Panel
Train Radio Interface Unit
•Implemented in the Front and Rear cab
•Fall Back connection to Rear cab
•Operating in the standby mode to the Front cab
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Train Radio Communication Capability
Users
Driver
Call Features
•Individual Call
•Group Call
Emergency Call
Direct Mode Operation (DMO) Call
Telephone Interconnect Call
EPABX
Radio Network
Call Matrix
OCC
•Train Radio - OCC
•Train Radio - DCC
•Train Radio - Train Radio
•Train Radio - EPABX
•Train Radio - Hand Portable
RCW
DCC
RCW
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Train
Direct PA Announcement from OCC to
Inside of Train
• In case of Emergency (e.g. Driver incapacitated),
Controller can Make Direct Announcement inside Train
• Pre_Recorded Announcement through Front Active CabSimultaneous Voice +Data
• Live Announcement through Back Cab-Driver can still
use front Radio
Implemented by Interfacing of On-Board Radio to On-Board
PA System.
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Subscriber Radio Features
Group Mode Operation
Excellent voice quality
Fast call set-up (300 ms)
Emergency Button Operation
Private Mode Operation
Phone Mode Operation
Status Mode Operation
Short Data Transport Service Access
Text Message Operation
Packet Data Service Access
Site Trunking Operation
Direct Mode Operation
Talkgroup Scanning
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Portable to EPABX/PSTN Call
• Selected Users allowed Portable to EPABX\PSTN
calls
• Both Incoming\OutGoing Calls allowed
• Full Caller ID available
• Full Duplex Voice Calls, just like a GSM Phone
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Radio to Station PA Announcement
• In Emergencies, Portable to Station PA announcement
facility. ( Fire, Evacuation,etc)
• Good Quality Voice due to inherent improved Quality of
TETRA
• Can Select a Particular Station Number and a particular
Zone ( UP-PF,DN-PF,Concourse,Full,etc)
• Implemented by Radio Interface to EPABX and further
EPABX Interface to PA
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Direct Mode Operation
Direct Mode (DMO)
Direct Mode (DMO)
DMO-gateway
Direct Mode (DMO)
Direct Mode (DMO)
DMO-repeater
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Network
Trunked Mode
Radio Coverage in Underground
• Is by LCX Cables and Indoor Antennas
• Bi-directional Amplifiers(BDA)/RF-Optical Repeaters
provided at every station ,feeding cables into tunnels and
station areas.
• LCX cables are also provided for GSM/CDMA operators
for Mobile coverage
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Further
ext
Station1
Station2
Station 3
BDA
CN
Station N
BDA
BDA
BDA
BDA
PS
BDA
DC Blocs
DC Blocs
Station
Network
EBTS
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DC Blocs
Station
Network
Station
Network
Power
Splitter
1:2
MTP700
Specifications
Battery life (with Std LiIon or NiMh Battery)
24 Hours (5/5/90), 15 Hours (5/35/60)
Environmental protection
IP54 (dust & water ingress)
MIL810 C/D/E (shock, vibration, drop ...)
Mode of operation
Simplex/Duplex, TMO/DMO
Bands
380-430 MHz
RF power
1 Watt
RX sensitivity
-112 dBm minimum
Audio power (speaker)
500 mWatt
Operating Temp:-30°C to +60°C
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MTM700 Specifications
Environmental protection
IP54 (dust&water ingress) – std.
Mobile
MIL810 C/D/E (shock, vibration,
drop ...)
Mode of operation
Simplex/duplex, TMO/DMO
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 Bands
 380-430MHz
 RF power
 3 Watt
 RX sensitivity (static/dynamic)
 -112/103 dbm minimum,
typically 2 dB better
 Audio power (speaker)
 5 W minimum
 Operating/storage temperature
 -30 to +60/-55 to +85
 Other
 Ext. PTT input
 External foot/hand emergency
input
 Horn&light output
STATION RADIO PHONE
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Radio Tower (50 m)
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Remote Base Station (BTS)
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Items Need to be Addressed by Manufacturers
• ISI- A true Interoperability with Mobility/Roaming
and not just Talk Group Patching.
• Fully Non GPS Based Sites
• Dual Mode Mobiles with GSM-R/TETRA
• TETRA over WLAN with Dual Mode Mobiles
MOTOROLA and the Stylized M Logo are registered in the US Patent & Trademark Office.
All other product or service names are the property of their respective owners. © Motorola, Inc. 20XX.
Conclusion
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TETRA communication system has
been implemented successfully
The signals are clear
The voice clarity is excellent
The TETRA Technology effectively
meets DMRC’s operational and
functional expectations.
MOTOROLA and the Stylized M Logo are registered in the US Patent & Trademark Office.
All other product or service names are the property of their respective owners. © Motorola, Inc. 20XX.
THANK YOU