Activities in CEPT ECC/WGFM/ Project Team FM54

3rd Interferences Workshop - European Commission (DG Move) and the European Railway Agency (ERA), 25 November 2014

Thomas Weber, ECO, Spectrum Management

Content

• On-going work in Project Team FM54

• Development of draft ECC Report 229

• Interference Mechanisms

• Draft Conclusions in ECC Report 229

• Coordination/cooperation process

Where does the action take place?

Interference Mechanisms (1)

Interference Mechanisms (1)

Unwanted emissions from UMTS/LTE in the GSM-R channel

A

f925 MHz

GSM-R channel

Receiver blocking due to high input powers

A

f

Min. S/N

Max. mixer power

Interference Mechanisms (2)

Receiver intermodulation (2 narrowband signals)

A

f

GSM-R channel

f1 f2fIM

fIM = 2*f1-f2

Interference Mechanisms (3)

Receiver intermodulation (1 wideband signal)

921.2MHz

924.8MHz UMTS

GSMUMTS signalIM products (all)IM frequencies involved when GSM-R frequency is 921.2 MHzIM frequencies involved when GSM-R frequency is 924.8 MHz

Interference Mechanisms (4)

Draft ECC Report 229• It is planned to submit the draft ECC Report to the next WGFM meeting in February 2015

for public consultation approval.

• Draft conclusions recognise:

• EIRENE specifies requirements for a digital radio standard for the European railways

• Both GSM-R and MFCN (Mobile Fixed Communications Network) licensees use the radio spectrum in compliance with the relevant European and national regulations

• Realistic UMTS and LTE signals have lower unwanted emission levels (10 to 20dB) than specified

• Measurement campaigns performed in 2013-2014 concluded that intermodulation products due to UMTS/LTE intra-signal intermodulation and also inter-signal intermodulation with GSM are generated within the current cab radio receivers and affects their operation

• Wideband signals impact the whole GSM-R frequency range. UMTS, LTE/5 MHz and LTE/10 MHz have the same interference potential

Draft ECC Report 229

• In order to successfully mitigate interferences due to blocking and intermodulation, the standard relevant for GSM-R radios (ETSI TS 102 933) was improved with respect to the receiver characteristics and published in August 2014. Field test clearly showed the improvements achieved by the radio module vendors. Nevertheless, improved receivers will still be impacted by unwanted emissions from nearby mobile/fixed communications networks

• A coordination/cooperation process should be used before, during and after the transition period towards improved GSM-R receivers

• The process may also be used to prevent interference from MFCN OOB emissions before, during and after the transition period taking into account the predicted GSM-R signal level then confirmed by measurement. Visibility and exchange of information shall remain to prevent any further issues

Draft ECC Report 229

• A formula is included in draft ECC Report 229 to provide the maximum MFCN OOB level that should be fulfilled at 4m above the rail tracks by MFCN operators, which provide a trigger to start the coordination process

• The proposed generic coordination/cooperation process can be adapted to meet national needs and remain a national decision, noting that existing processes are already in use

• To support the technical analysis, a single agree electronic tool could be developed, based on SEAMCAT; this is currently under investigation.

Coordination/cooperation process

Roadmap Approval ECC Report 229

• 9-13 FEB 2015: WGFM#82 approves draft ECC Report 229 for public consultation

• Beginning of March – mid April 2015: public consultation process

• 18-22 May 2015: WGFM#83 approves ECC Report 229 for publication

• 25 May 2015: publication

Using Seamcat as  a potential tool for GSM-R-MFCN in support of national coordination/cooperation, please note the workshop on 5-6 March 2015 that is especially covering EPP (Event Processing Plugin) customisation.http://www.cept.org/ecc/tools-and-services/cept-workshops

Thank you for you attention

Thomas.Weber@eco.cept.org

www.cept.org/eco

www.cept.org/ecc

Questions??