Railways | ATDI

Railways


ATDI is expert in overcoming the problem of a moving audience passing through sometimes very crowded spectrum hotspots.

ATDI has worked with rail- and track-operators across Europe and is vastly experienced in managing their needs.

Overview

ATDI has been working with railways for the majority of the company’s three decades of history. ATDI was a pioneer in the concept of spectrum sharing so as to provide on-board WiFi services for passengers that did not cause interference when the train was near vital external systems such as airport radars and, in one instance, radio telescopes.

In addition, the company continues to expand its involvement with train- and track-operators; ATDI has worked across Europe in planning and modeling railway operators’ communications with train drivers, network controllers, safety workers and other staff and the number of rail companies turning to ATDI for help in this area continues to rise.

ICS telecom EV features propagation models which perform coverage calculations to a high level of accuracy without the use of the automatic model tuning module, a model which can be used at a calibration stage to improve the final AFP result when drive test measurements are available.

ATDI offers a comprehensive portfolio of products and services for this industry, including:

  • Radio-Planning (GSM-R, LTE-R, PMR)
  • Environmental analysis (human hazard, Natura 2000)
  • Frequency Planning
  • Cross-Border Coordination
  • Traffic and interference analysis
  • Intermodulation
  • Network optimisation
  • Design, construction and implementation of the ERTMS/GSM-R radio subsystems
  • Design and construction of fiber-optic cable networks
  • Design and construction of transmission systems
  • Site surveys
  • Measurements
  • Cartography

 

Case: Route and prospective Planning

Challenge

The radio access side of a GSM-R or LTE-R networks consists of base transceiver stations (BTS) and terminal stations located along the railway line. The first step in planning GSM-R and LTE-R networks is to search or select areas close to the railway. The BTS locations will provide optimal radio coverage of the whole service area, leaving no portion of the railway uncovered and should comply with EIRENE SRS requirements. Each base station can be configured with one to three sectors, optimally orientated along the railway tracks.

Solution

ICS telecom EV uses ‘route planning’ for the selection of existing sites and ‘prospective planning’ for the deployment of additional sites to automatically identify the best BS locations. The software can be configured to account for constraints such as deploying a BS at a given position (clutter selection modelling of the railway infrastructure), and can cover a minimum number of points (user configurable). In addition, a user-defined minimum overlapping order can be set to ensure that the whole area is covered. The sector orientation can also be automatically optimised consecutively using the ‘station azimuth’ feature, to ensure each sector is optimally orientated to cover the largest number of points along the railway track.

 

Case: LTE-R deployment along railways

Challenge

The primary characteristics of LTE-R are high speed, secure networks with ample bandwidth capacity to support voice and data for train controls, onboard video surveillance and infotainment services on a single IP network. This can be deployed across multiple frequency bands.

Solution

ICS telecom EV simulates the behaviour of traffic for a set number of users depending on the various types of schedulers. ICS telecom EV features a traffic calculation process based on LTE schedulers, which determines the best algorithm to apply for each traffic scenario. The user defines the profile of the UE (i.e., maximum transmit power, antenna height, transmission mode and traffic demand) and generates the population of the UE (per density per km² or over a polygon or per site). The LTE-parenting function in ICS telecom EV calculates UE by UE, the effective traffic received based on the selected algorithm. Nb. during parenting the DL and UL radio conditions are verified (RSRP, RSRQ and PUSCH). The ‘ICIC enhancement’ option can also be validated to reduce the risk of collision between RBs transmitted by inter-cells, as well the MIMO adaptive switch modes (AAS).

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