In confined spaces such as metros and subways, the penetration of GSM, UMTS, LTE, TETRA or TETRAPOL signals into tunnels is impossible without a radio relay system. However, in emergency situations that require the support of emergency services such as police, fire and ambulance, you need a robust and reliable mobile and radio coverage system to communicate in underground facilities.

Your needs

Our teams offer you a tailor-made solution based on the technologies best suited to your needs.

·  Respect of routes and timetables
·  Mobile staff safety (drivers, controllers)
·  Information to users
·  Maintaining the operational condition of the equipment on board the metro
·  Obtain from the radio or mobile network within metro lines

Our solutions

Our passenger information system support system has 4 main functions :

1. Monitoring of schedule compliance & real time information

We help public transport agencies to monitor their timetable adherence and to efficiently manage service interruption: thanks to our decision support and geolocation solutions and AVL systems,real-time location data is collected and transmitted. The operator will therefore be able to optimize Service Interruption by deciding on the right corrective measures and adapt their journeys to the needs of the line (rescheduling, diversion, acceleration, deceleration, only one station out of two, etc.) – Our network is specified to allow the operator to be connected to the drivers.

After calculation, the location data can be sent directly to the traveller information display systemslocated on the routes or proceed with personalized alerts (sending SMS, mails, site info, …).This allows passengers to know precisely the time of the next subway.

2. Protection and Surveillance of workers

In order to contribute as much as possible to the protection of mobile operators, we act on the control of on-board systems inside buses or trains. This includes the visualization of video protection cameras, the triggering and control of ambient microphones and the retrieval of alerts. Through this remote control, the operator has full control of the parameters to decide on corrective actions, from the doubt removal to the intervention.

3. Operational readiness support (ORS)

Our role is to ensure the collection, recording and retransmission of on-board equipment, (operating hours, fault management, obsolescence, alerts…) Data is collected locally by LTE or WiFi networks. These networks feed an Enhanced Computing System.

4. Setting up or adapting the network infrastructure

For all the above solutions to work, a good radio and mobile network infrastructure is required. Thus, SEE, thanks to its expertise, is able to upgrade and readapt an already existing infrastructure. If required, we are also able to install a new infrastructure to extend the network coverage from the outside to inside the uncovered area.


SEE offers you a complete set of solutions to extend the continuity of your indoor radio coverage service.

SEE offers you a complete set of solutions.

A Rugged Edge Computer Embedded with Smart Technology.

A simless autonomous solution. Just plug easypod to your existing solutions, and play !

Connect, Locate and Manage Devices Over Long Range.

SEE offers you a complete set of solutions to extend the continuity of your outdoor radio coverage service.

SEE offers you a complete set of solutions.

Use cases

RATP Paris Underground – Ensuring continuity of service for firefighters and police in the underground

SYTRAL Lyon Metro – Controlling the general power cut in the event of a forced shutdown of the metro trainset

TISSEO Toulouse Underground – Radio communication equipment and maintenance

Marseille – RTM / France : Embedded computers installation

Madrid Metro (L8) / Spane : TETRAPOL coverage extension

Contact us

If you have any questions !