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| | Scope of the pilot site AachenActual situation
With the Schengener agreement the European states have decided to introduce uniform telecommunication systems for the Authorities and Organizations with safety functions (AOS), like police, fire brigades and customs. This is planned to enhance the co-operation between different states and between different AOS organizations after the falling down of the inner European borders.
On basis of this decision, the members of ETSI (European Telecommunications Standards Institute) developed the new trunked radio standard TETRA (TErrestrial Trunked RAdio). The scope of users of TETRA does not only include the public safety organizations, but also for example users in the area of transports and public local traffic companies.
In France by order of the Police Nationale, the french company Matra Nortel Communications developed the trunked radio system TETRAPOL, which is adapted to the needs of the public safety froces.
Both trunked radio systems have been chosen as platforms for the operation of national radio networks. They offer services like digital encrypted voice transmission, connection-oriented and connectionless data transmission. Available voice services are:
- Individual call: Point-to-point (PtP) connection between a calling and a called subscriber.
- Group call: Point-to-multipoint (PMP) connection between calling subscriber and a group called through a common group number.
- Emergency call: With activating an emergency call, the terminal transmits a status message. The dispatcher can either activate an open channel or set-up a connection with high priority to the calling subscriber.
- Direct call: PtP connection between two mobile devices with no use of the infrastructure.
- Broadcast call: PMP connection in which the subscriber group dialled through a broadcast number can only hear the calling subscriber.
The new trunked radio technique will replace the existing analouge radio networks as well as the usage of other coexisting telecommunications techniques like GSM or Fax.
After the verification of the general suitability of TETRA during a pilot trial in the area of Berlin/Brandenburg, the new technique will be tested in a border-crossing pilot operation. The suitability will be tested in pratical application and the border-crossing communication is under evaluation. With the evaluation of the tenders for the pilot trial Aachen, where both, TETRA and TETRAPOL manufactureres participated, on a technical basis, a TETRA system has been chosen. The pilot operation begins in the middle of 2001 and lasts 2 years.
Coverage area
The planned coverage area includes the city and district of Aachen with 715 sqkm and an additional area with a width of 10 km parallel to the German border on Dutch and Belgian territory. The coverage area includes lowland with mountain ranges up to 600 m. The border to Belgium, that is included in this pilot site, is 50 km long, the one to the Netherlands is 35 km long.
Additionally 35 km of German motorways are included in the coverage area, for which reason the motorway police and the responsible district government Köln are also involved into the pilot project.
Within the coverage area the clinical complex of Aachen can be found, for which the in-house radio coverage is to be proven. Further objects, that are exceptional from a radio technical point of view, are the tunnel in Stolberg, the Rur water reservoir and the area around Herzogenrath.
The pilot project involves the fire brigades and medical services of the city and the district of Aachen, federal police, state police, customs and the Office for the Protection of the Constitution.
System description
The planned system includes two sub networks to show interoperability between hardware of different manufacturers. There will be two remote tactical working positions for the fire brigades and health services (city and district), one for the police and one for customs. The existing analogue networks will be integrated via ISDN.
Contributions of ComNets
The tasks of ComNets during the pilot include beside others:
- Usage of professional tools for the systematic evaluation of the chosen system's qualification for the claimed applications.
- Tool based radio and fixed network planning.
- Tool based statements regarding the radio tolerance between analouge and digital PMR systems.
- Measurements for the quality judgement of the radio coverage and the radio systems.
- Contributions for the specification and support for the implementation of the fixed network interface for the coupling of TETRA and TETRAPOL systems.
- Analyzis of the network management and evaluation of fault reports.
Traffic scenarios
The following traffic scenarios are to be tested in the pilot project, because these have been typical applications or have not been possible, i.e. data transmission, in the old analogue systems yet:
- Local radio traffic of a large group with mobility across the system boundaries,
- Small group in direct mode outside the coverage of the radio system,
- Small group with additional base station outside the coverage of the radio system,
- Data transmission,
- Emergency call with priority,
- Telephone traffic via ISDN gateway to public networks,
- Coupling to analogue networks of the German security forces and the adjacent authorities in the Netherlands and Belgium,
- Local radio traffic of air vehicles (typically helicopters),
- Paging.
| | Last Update: 20.11.2006 09.31 | |
