Helios® Multi-Band Digital In-Train Repeater

Train applications present extremely challenging RF environments. The complexities of different terrain combined with the rapidly changing outdoor signal levels of the various networks makes it difficult for operators to provide the coverage and service their customers demand while travelling from city to city or to another country. But the business travelers expect good coverage, without dropped calls, and data connections wherever they are, for constant access to the internet, e-mail, and various mobile device applications.

In addition, with the development of mobile communication technology, new communication technologies have been adopted especially in 4G or even 5G NR. Hence, telecom operators must handle multiple technologies / networks simultaneously, which will cover most cellular frequency band such as 700MHz, 800MHz, 900MHz, 1800MHz, 2100MHz and 2600MHz etc., it will also call out a critical challenge that is generally space limit inside train carriage for the In-train repeater installation.

Providing reliable cellular services inside High-speed Trains is challenging in many respects. High-speed Trains travel through dense deployed cellular base stations along trackside requiring the Cellular Multi-Band & Multi-Operator In-Train Repeater to seamless roaming among these cellular base stations along the trackside and quickly synchronized with them. The Repeater equipment is subject to constant vibration conditions and occasional high shock levels. Also, the Donor Antenna, usually located on the roof the Train Carriage, must have sufficient Isolation from the Service Antenna to ensure that a Self-Oscillation condition is not initiated. Many new Rolling Stock are delivered with Built-In 19” Rack Space to house In-Train Repeaters.

For these reasons, Helios has developed our rack mount Digital Multi Band In-Train Repeaters to resolve these issues. It provides a fully Digital software-based platform and enables on-the-fly filter Re-Tuning at Boundary Borders.