1. TETRA (CERN’s Safety Radio Communication Network)
Speaker : Aurélie PASCAL IT-CS
Tetra forum 7th of February 2013

2. TETRA Infrastructure Components of a TETRA Network : DMO SwMI DMO TMO
Direct Mode Operation
SwMI
= Switching and Management Infrastructure
Network Manager
Tetra Base Station (TBS)
DMO
Gateway/Repeater
TMO
Trunked Mode Operation
Attention DMO reserve’ aux pompiers
TBS
Gateway PABX/GSM
Base stations controller
Dispatcher
Aurélie PASCAL IT-CS / TETRA Forum

3. Aurélie PASCAL IT-CS / TETRA Forum 07-02-2013 3
CERN
FREQUENCIES : TETRA (Terrestrial Trunked Radio) for European market (except Public safety services) works in the bandwidth : MHz
VOICE CAPACITY: 17 simultaneous group calls (TDMA Multiplexing) / 500 devices
Scalable to many
DATA CAPACITY:
Short Data Service : SDS
Packet Data Service : maximum data rate 19.2kb/s
High resiliency:
Backup of each active equipment and interconnections
Redundant TETRA core equipment located on different sites
Interconnection with PABX : ISDN (2 redundant gateways)
 Consuming of frequencies, reserved to heads of the Fire Brigade
Relay of Swiss and French TETRAPOL frequencies :
Strong cooperation with Geneva Police, Customs, Swiss and French Public Safety services
SDS: prendre un exemple d’une intervention  arrive’ sur site, prise de poste
Aurélie PASCAL IT-CS / TETRA Forum

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Network Design
Aurélie PASCAL IT-CS / TETRA Forum

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Indoor coverage
TBS A: Water Tower
FA1 + FA2
TBS B : LHC4
FB1 + FB2
No active equipment in LHC/SPS/PS
FA1 + FA2
+Tetrapol
TETRAPOL
FB1 + FB2
+Tetrapol
FA1 + FA2
+Tetrapol
Site n
Site n+1
Site n+2
LHC / SPS
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TETRAPOL Repeating
Bdg 58
Channel-selective repeater CSR438
Pick-up antenna
TETRA A+B
TETRA C+D
Fireman at the surface
Bdg 4
coupling
Power?
Channels? MU
Tx/Rx TETRAPOL
Band-selective repeaters
Fireman
LHC/SPS tunnel
Aurélie PASCAL IT-CS / TETRA Forum

7. One virtual group of communication
TETRA Calls
Standard group call :
CSA Dispatcher
Guard LHC8
One virtual group of communication
Guard gate B
Half-duplex call
Aurélie PASCAL IT-CS / TETRA Forum

8. Fire Brigade Dispatcher
TETRA Calls
Dynamic group call :
Contrôle room EXCR
Fire Brigade Dispatcher
One group of communication
Intervention Area
Fireman
CSA
Fireman
Electrical piquet
Half-duplex call
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TETRA Calls
Individual call :
TI Dispatcher
Electrical piquet
Half-duplex call
Aurélie PASCAL IT-CS / TETRA Forum

10. TETRA Calls : Emergency issue at surface
L1 (1 575,42 MHz) & L2 (1 227,60 MHz)
SDS : GPS positioning
TETRA BS
DISPATCHER / FB
Emergency call or Lose of verticality
Accuracy ~ couple of meters
SDS : last known GPS positioning
Alarm & SDS received and automatic individual call established
Dedicated IP Network
User entered in a building with TETRA coverage
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TETRA Calls : Emergency issue in underground facilities
Infrastructure for Indoor localization not yet ready
Alarm & SDS received and automatic individual call established
SDS: positioning
Emergency call or Lose of verticality
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Example in LHC
DISPATCHER / FB
2. When catching the ID from the beacon, the terminal forwards its location to the Dispatcher Workstation at the Fire Brigade 2 3 1
3. When incident : lose of verticality detected or emergency button pressed  emergency SDS sent to the Fire Brigade Dispatcher and individual call established
1. The Beacon located in an alcove sends its ID through a remote antenna to TETRA terminal
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Surface radio coverage
Lose of communication due to forest
Base Station
Repeater
Lack of coverage due to relief
Software: ProMan from AWE
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Indoor radio coverage
LHC experiments, LHC, SPS, PS, Booster, Linac tunnels… are covered with TETRA services but few minor issues are still to fix:
in LHC6 and LHC8, in the middle of the arc section, short area where the signal strength is quite low and communications may be lost.
SPS6 section of tunnel (from the middle of section SPS5-SPS6 to the middle of section SPS6-SPS7) is not yet covered by TETRA.
These issues will be fixed during LS1
Some areas are not covered for now:
The North area : tunnels TT81, TT82, TT83, TT84, TT85, TDC85
The transversal galleries in PS complex
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Support / Maintenance
Infrastructure:
monitored 24/7 via the Computer Center over
Spectrum
no need for specific software tools
1st level of maintenance done by the First-Line team
2nd level of maintenance performed by CERN
3rd level of maintenance performed by our contractor 3T
Terminals:
Spare parts, repairing and configuration managed
by IT-CS for all terminals through our contracts
1st batch provided by CERN
For further needs, can be bought at CERN’s stores
Online training and practical one (Firebrigade) on radio delivery
Aurélie PASCAL IT-CS / TETRA Forum

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2013 Planning
January: TETRA system operational for CSA & firemen!
First semester:
Deployment of Indoor Geolocalisation solution in one Arc section of the LHC and one Experiment
Installation of mobiles in firemen’s vehicles
Distribution of terminals (Experiments, piquets…) and trainings
ESD distribution in all sites and new batteries for 4h of autonomy
Microwave Backup link between the 2 main BS  coordination between ARCEP and OFCOM for the allocation of the frequency
And…:
Deployment of the Indoor Geolocalisation solution in LHC, SPS, PS, Booster, Linac.. tunnels, Experiments and critical areas (Computer Center…)
Development of a new fully integrated software platform ILDA (Indoor Localisation and Dispatch Add-On)
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ILDA
The Integrated Localisation and Dispatch Add-On (ILDA) is a client-server system, with dedicated accounts and specific priviledges, which will integrate:
The display of the localisation of TETRA radios (via GPS or Indoor Localisation System) on a fixed geographical area or for a fixed list of talk groups
The Dispatching features which will enable to establish calls and send SDS messages to defined radios through a Phonebook
An incident mode reserved to Firebrigade with wider features such as direct interaction with the TETRA radios displayed on the maps (calls, SDS sending, selection of multiple radios to create dynamic group of communication…), a tracking mode, search of a specific map (interconnection with GIS portal), transmit inhibition of a radio…, for which all actions will be logged
An interconnection with CSAM centralize level 3 alarms : TETRA emergency alarms
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QUESTIONS
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Underground radio coverage / issues
LHC8:
Lose of communication in the middle of the section
LHC6:
Lose of communication in the middle of the section
LHC8  du a un pb de connecteur ou port sur le splitter du US85
LHC6  du a un pb sur un connecteur/raccord au niveau de la porte R74 vers le LHC7
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Underground radio coverage / issues
Experiments: the emergeny exits to access the PM lift, closed to the « trémie », are not covered yet
SPS6:
No TETRA coverage
SPS6: il faut attendre la fin de la VHF pour raccorder le TETRA (sinon risque de dysfonctionnement GSM  return loss, combiner pas adapte au SPS6  low frequency only)
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Underground radio coverage / issues
PS:
Installation de LF necessaire
No coverage in the transversal galeries nor in the chicane of door 102
Aurélie PASCAL IT-CS / TETRA Forum

22. Aurélie PASCAL IT-CS / TETRA Forum 07-02-2013
Indoor geo-localisation :
available solutions
STProtect:
SYSOCO & SEPURA partnership
Beacon using 868MHz frequency
Receiver integrated into the STP8000 terminal
Advantages:
Solution already commercialised and even better by SEPURA (recognized player on TETRA market)
durability of the solution
Drawbacks:
Receiver not yet integrated in the STP8X (ATEX)  on going
The beacon may need to be adapted to enable a remote extended antenna and an external Power Supply
Aurélie PASCAL IT-CS / TETRA Forum