projects spotlight

Clear Cincom telecom Projects - 2011

Almere (The Netherlands) Region Network Quality Investigation

Client: Nokia Netherlands   

GSM-R network quality issues were discovered in the Almere region utilizing static measurement equipment. The test setup encompassed the use of a Kapsch radio and a TrioRail handset in dedicated mode connected to antennas mounted on a tripod at the side of the track. A potential interfering frequency from another GSM-R network cell was identified. From the information gleaned from the test, optimization work ensued to eliminate the interfering frequency and solve the quality issue.


Almere and Leiden (The Netherlands) Integration Measurements

Client: Nokia Netherlands   

The GSM-R cell sites serving the train stations in Almere and Leiden underwent carrier unit additions to improve capacity for the new InfoPlus panel installations.

The new TCH (traffic channel) frequencies which are assigned to the new carriers units, needed to undergo integration testing to ensure no GSM-R network degradation was present to the surrounding network. Both GSM-R network coverage and quality were tested with a high degree of success.

The integration of the new carrier units and the associated frequencies were accepted into the Netherlands GSM-R network with a quick and efficient turn around time between its inception and delivery.


Arnhem (The Netherlands) Central Station – Continuous Wave Measurements

Client: Nokia Netherlands   

The re-design and build of Arnhem Central Station requires the surrounding GSM-R radio network to be modified to ensure it serves the new platform, station hall and InfoPlus panels with acceptable coverage levels and suitable capacity.

A continuous wave measurement test was conducted to ensure the new proposed site location was suitable for the required re-design. Using an LMW Carrier Wave transmitter equipment setup, a survey was conducted on foot in the new station hall, platforms and utility locations to identify any areas of concern if they were present.

Further to this, a Line of Sight survey was conducted which assisted in the decision making process regarding the location of the new site.


Arnhem (The Netherlands) Dive Under – C2000 (TETRA) Measurements

Client: Nokia Netherlands   

In conjunction with the re-design of Arnhem Central Station a new dive under is being constructed to alleviate the congestion of heavy rail fright traffic bound for the Betuwe freight line.

The receive levels were measured from a number of C2000 donor sites at the location identified for the new pick-up antenna to serve the tunnel. A Rohde & Schwarz scanner was used with different antennas from a panel type to a yagi, which provided a number of scenarios which assisted in the decision making to finalize the design.

Clear CinCom engineers measured the losses and gains for all the individual elements of the test equipment setup, assimilated an accurate ‘link budget’ and applied an offset to the recorded results. This provided the customer with increased accuracy when reporting the received signal levels.


Drontenmeer Tunnel (The Netherlands) - C2000 (TETRA) Measurements

Client: Nokia Netherlands   

The Drontenmeer Tunnel is located on the Hanzelijn between Lelystad and Zwolle. Clear CinCom conducted C2000 measurement inside tunnel on foot using an Anritsu handheld scanner and a TETRA ‘quarter wave’ receive antenna which was pole mounted. Measurements were taken at 10m intervals to ensure the received levels from the C2000 donor sites would service the tunnel in case of emergency situations. In addition to this, Line of Sight surveys were conducted to assist in the selection of the best serving site.


Hanzelijn (The Netherlands) – New Site Integration Test Measurements

Client: Nokia Netherlands   

On completion of building the 6 sites on the new Hanzelijn, extensive GSM-R testing was executed on all the connecting and surrounding train lines to ensure no network degradation was present.

The testing consisted of coverage and quality over a period of one week which illustrated the successful integration of the new Hanzelijn sites. Clear CinCom engineers worked closely with Nokia Siemens Networks staff to integrate the new sites on this important project, with a minimum of optimization required on the test drives to ensure all the key performance indicators passed.


Hattem (The Netherlands) Dive Under

Client: Nokia Netherlands   

Radio network testing was conducted for a repeater cell which was installed in the Dive Under tunnel as part of the Veluwelijn and the Hanzelijn. This test was conducted using a scheduled commuter train with a test radio connected to the trains GSM-R antenna. This specific test proved the correct functionality of this repeater and ensured that the coverage levels in the Dive Under are acceptable for safe voice train communication.


Oldenzaal (The Netherlands) GSM-R Site Re-location

Client: Nokia Netherlands   

The re-location of this GSM-R site was required due to the development of the surrounding commercial land. Clear CinCom conducted Carrier Wave measurements in the new site location to gauge the levels of coverage which would be provided by the new site in this area.

LMW Carrier Wave transmitter equipment was used to radiate a test signal along an important regional rail track which links the Netherlands with Germany. A scheduled passenger train was used to measure the transmitted levels by using an Agilent scanner and a test PC connected to the trains GSM-R antenna.


The Hanzelijn (The Netherlands) – Quality of Service Testing

Client: Nokia Netherlands   

With the initial optimisation of the Hanzelijn completed, Clear CinCom engineers undertook an intensive 5 day program of Quality of Service measurements. These Quality of Service measurements encompassed the National network criteria and Subset-093 in accordance with ERTMS GSM-R QoS Test Specification 0-2475v3.

A number of test setup’s were run simultaneously to record the results for Bit Error Rate, Transmission Interference Rate, Data Delay, Connection Loss Rate, Connection Establishment Delay, Call Setup Success Time and Call Setup Success Rate at data speeds of 2400bps, 4800bps and 9600bps. In addition to this the coverage in accordance with EIRENE was also measured every 100m section of track.

Further to conducting the test measurements, Clear CinCom successfully assembled and installed a Fixed Side setup with 4x V110 modems based on a PRI Card and a Desktop PC. The installation was connected to a E1 line and setup in the Lelystad RBC technical room. This provided the fixed side engineer with a simple, robust and reliable installation for the Subset-093 Transmission Interference Rate measurements which saved the client money and time.


The Hanzelijn (The Netherlands) – Testing and Optimisation

Client: Nokia Netherlands   

With the construction and commisioning of the 6 new sites on the Hanzelijn being completed, testing and optimisation commenced. The Hanzelijn runs for approximately 45km between the towns of Lelystad and Zwolle with the test runs taking place along the entire length of the track.

The GSM-R coverage, the handover behaviour between the cells and the repeater redundancy concept for the Drontermeer tunnel , was analyzed and optimised in order to be compliant with SubSet093 for the ETCS Level 2 railway line. Various KPI's were tested among the Bit Error Rate, Transmission Interference Rate, Call Setup Success Rate and Transfer Delay Rate were all measured to gauge the quality of the GSM-R radio environment.

The testing also required the C2000 (TETRA) network to be measured along the complete Hanzelijn track and in the Drontermeer tunnel in both the downlink and uplink directions. Further to this, a test was conducted ‘on foot’ in the escape areas of the Drontermeer Tunnel. The equipment and the unique adaptation of the wheel sensor/odometry system (as used in the HSL-Z Tunnel Oude Maas test) were implemented for the C2000 testing of the Hanzelijn.


Tunnel Oude Maas (The Netherlands)

Client: Nokia Netherlands   

The Tunnel Oude Maas is a two tube tunnel on the High Speed Line which underwent a replacement for 325m of ‘leaky feeder cable’.

This is a special location area, in which the requirement for both the GSM-R radio environment and the C2000 (emergency TETRA radio network) environment were tested. The equipment used a Clear CinCom inspired hybrid designed of bespoke testing and standard testing platforms, consisting of Kapsch radios for the GSM-R and a Rohde & Schwarz TSML CW Scanner for the C2000. In addition to this, because of the tunnel environment, location based GPS data could not be used. Therefore a unique installation was commissioned to use a train odometery system in conjunction with track Km markers to ensure the recorded levels were accurately referenced to a position. All the tests were conducted in both the ‘uplink’ and ‘downlink’ directions which ensured full functionality for both technologies.


Utrecht (The Netherlands) Triangle Re-design and Post Optimization Testing

Client: Nokia Netherlands   

The Utrecht Triangle consists of national train lines that connect Utrecht with Breudijk to the west and an ETCS line to Breukelen in the north. This critical and busy region underwent many optimization changes that encompassed cell additions and removals, physical antenna changes and frequency re-planning to four important GSM-R network cell sites.

In addition to the GSM-R coverage, Bit Error Rate and Call Setup testing was conducted to ensure a high level of GSM-R network quality was maintained when the optimization changes were implemented.


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