MIR-T Subrack for 19 Applications

Mobile phones are a part of everyday life. In fact, users expect that good coverage exists wherever they are - also in trains. However, due to trains metalized windows the penetration loss reaches 30 dB in the most cases which dramatically reduces good zones of coverage and therefore high data rates along railway tracks.

A possible solution might be to install macro sites along the tracks but this is a very expensive solution compared to intrain repeaters which will be installed inside trains to overcome train penetration loss.

Now designers of in-train applications are able to provide coverage to passengers even if base stations are far away. Andrews MIR-T series repeaters are designed for 19 rack mounting. Each frequency band (GSM-R, (E)GSM900, GSM1800, UMTS) fits into one 19 chassis of 1 HU which can be combined externally. Tunable band selective conversion modules also provide a high degree of flexibility.

Additionally the MIR-T family is designed specially for a long lifetime and requires no regular servicing. This translates into considerable additional savings as there is no regular maintenance required.

The Andrew in-train repeater is a versatile, cost-effective, multi-band, multi-technology solution designed for GSM, GSM Rail and UMTS. It combines the advantages of the GSM and UMTS architectures with additional simulcasting and other features:

• Reduced mobile transmit power
• Improved signal quality
• Increased frequency use and capacity
• Reduced system engineering design time
• Optimized homogeneous coverage
• Increased flexibility for future applications

Mobile Coverage Application Examples

Coverage system that uses an ION FDAS. A network of fiber connected ION devices distributes radio signals uniformly along a railway line even as the train passes through difficult coverage areas, such as tunnels and hills. The system maximizes channel efficiency and signal homogeneity along the route and provides optimal voice quality and high speed data transmission.

Prevention of dropped calls. Trains may move at speeds in excess of 300 km/h. As such, the handover region between cells is critical to prevent dropped calls. Andrews Mobile Coverage System produces elongated cells, which reduces the number of handovers required while simultaneously providing high signal strength within the handover region. Furthermore, the systems control mechanisms allow optimization for this critical region.

For more information, email us: Contact Andrew/CommScope.