LKA München: Complexity of Functional Processes in Digital Radio

Digital radio in Germany is a sophisticated ecosystem that facilitates smooth communication between radios, the TETRA network infrastructure, and control centers. However, the diverse array of technologies and solutions provided by various manufacturers, combined with a multitude of configuration options, introduces significant challenges in the integration of all components. Additionally, country-specific regulations and organizational guidelines add layers of complexity to this intricate landscape.

1. Radios and Programming: Effective radio programming is essential for optimal functionality. Different types of end devices from different manufacturers behave differently, which increases complexity.

2. TETRA Network and Control Center: Communication is facilitated through the TETRA network to the control center, requiring careful attention to various interfaces, such as those between the communication system and the TCS server.

3. TCS and FRT Connection: The control centres use both TCS connections (standard operation) via wire and FRT connections (fixed radio terminals) at fallback level. The features vary depending on the connection type. For example, the subscriber tracking function of radio devices, which is essential for the control centre, is not possible via the FRT connection.

4. Guidelines and Recommendations: The BDBOS (Federal Agency for the Digital Radio of Authorities and Organisations with Security Tasks) provides clear guidelines for important operational processes, including emergency calls.

5. Country-Specific Regulations: Each federal state may have additional or modified requirements, which can add complexity.

6. Connection options: We offer multiple connection options, including direct LS2 connections to the TCS server, digital radio plugs from various manufacturers, and the new TAIRA variant with LS1 (audio interface) over IP. While integrating components from different manufacturers can lead to different system behaviors.

7. Uncertainty About Features: Sometimes network features are available but cannot be used due to lack of commissioning. We develop manufacturer-proprietary solutions to enable, for example, “Dynamic Group Number Assignment (DGNA) with Group Attachment” through alternative means.

8. Software Updates: Network software updates can have an impact on functionalities. In the past, for example, it meant that a group combine that had been created could no longer be resolved.

Authorizing authorities in each country recognize their critical role in maintaining smooth operations for users. The Landeskriminalamt (State Criminal Police Office) in Munich has tasked eurofunk with establishing a connection to the TETRA network for control centers, offering both wired options via TCS-API and wireless solutions through FRT. This initiative enhances the LKA’s testing capabilities, bridging control centers to radios effectively.