Bremer Straßenbahn AG (BSAG) operates a tram network with 8 lines totalling 114.6 km and a bus network with 44 lines covering 505.4 km. 120 trams and 30 buses operate on this network. To ensure that public transport in Bremen runs smoothly, some 2,000 employees are on duty day and night, which means that a reliable, robust and secure communication solution is essential.


Bremer Straßenbahn AG (BSAG), Germany

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Project Time




The Challenge

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    HMF carried out the replacement with the support of partners Trapeze Switzerland, Meretec Technologies, I.S.S. and Comtechnik Funk. As well as integrating the existing Intermodal Transport Control System (ITCS) control centre solution, the radio-technical vehicle equipment was also replaced. BSAG placed particular emphasis on network coverage, redundancy and high availability. The structural conditions of the sites for the base stations posed a challenge for the optimised radio network planning: among other things, they were installed on a bunker and a power station.

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    As part of the modernization program, the Bureau wanted to upgrade the communication and incident recording solutions available to customs staff. It wanted to implement a body worn camera (BWC) system to provide daily recordings and real time viewing capabilities.

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    The BWC solution was needed to capture video evidence, so the footage could be used to review incidents. BOC also wanted to deploy BWCs at ports throughout the Philippine archipelago to enhance its monitoring activities.

The Solution

 With the new TETRA ACCESSNET-T® IP radio network from Hytera Mobilfunk, BSAG has received a comprehensive and powerful solution for voice and data communication with which they can control the entire vehicle operation comfortably and securely. As a turnkey solution provider, HMF has taken over the planning, commissioning and integration and continues to support BSAG through a service contract.

The new TETRA radio network from Hytera Mobilfunk replaces an old analog system. The new infrastructure consists of several base stations covering the entire BSAG line network.

The Benefits

Bremer Straßenbahn AG transports 300,000 people a day throughout Bremen and the surrounding area through local public transport with approx. 350 trams and buses.

Conversion During Ongoing Operation, As the radio system was implemented during ongoing operation, the trams and buses were converted to the new technology at night in the BSAG depots during off-peak times. The old analog system and the new TETRA network were operated in parallel for the migration period. 

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