Trafikverket Improves ERTMS & Interference Management


Carlo Ughetti, Director Comtest Wireless

Using Comtest Wireless active and passive testing with combined performance analysis tools, makes it faster and easier to monitor and manage GSM-R service quality.

Comtest Wireless, independent experts in the field of GSM-R and ERTMS test and measurement solutions have enabled Trafikverket to better monitor the quality of GSM-R networks and therefore, minimise issues with ERTMS deployments.

In 2012, Trafikverket required a highly robust solution to test the quality of GSM-R functionality at every interface, both before and after deploying ERTMS along each line. Amongst the reasons for Comtest Wireless winning the public tender were the strength of its expertise and the unique ability to provide a combined test and measurement solution.

Today, Trafikverket is able monitor performance at every interface 24/7 using active monitoring on-board via cab radios and scanners, as well as passive monitoring along the track, using probes. Since then, Trafikverket has not only saved considerable time and effort identifying network issues; it has also discovered an additional benefit – interference management. As Comtest Wireless provides the ability to collect and store data for many years, Trafikverket are able to access historical records. This has helped in their interference analysis process, as they can compare current and historic data to help determine the reasons for interference issues.

Magnus Jakobsson is responsible for implementing the Comtest Wireless solution at Trafikverket. He says “When Trafikverket started to deploy ERTMS, it was difficult to identify whether an “ERTMS –problem” was a radio problem or a signalling problem. It could take us weeks to pinpoint and address a problem in the correct way.

After deploying Comtest Wireless’s combined test and measurement solution, we now have automated, 24/7 monitoring that covers the entire network. It often takes only minutes to identify the source of the issue, which is a huge saving in time and resources.”

Carlo Ughetti, Director at Comtest Wireless adds “as public mobile operators rolling out 3G and 4G networks in the 900MHz band can cause interference with GSM-R under certain conditions, Trafikverket has found the monitoring system has another valuable benefit. Not only can it help to identify where and when the quality of service is affected but it also helps to determine whether this can be attributed to any changes made by the mobile operators. When new transmitters are installed or frequency variations are deployed for example, the Comtest Wireless solution can easily access current data to pinpoint issues and also compare the quality of service with historical measurements, which has helped Trafikverket to identify issues effectively.”

Organisations looking to learn more about how they can install GSM-R and ERTMS monitoring solutions or to find out more about interference performance management should contact Comtest Wireless at contact@comtestwireless.eu.