9Interference Mechanisms (4) 921.2MHz924.8MHzUMTSGSMUMTS signal IM products (all) IM frequencies involved when GSM-R frequency is MHz IM frequencies involved when GSM-R frequency is MHzReceiver intermodulation (1 wideband signal)
10Draft ECC Report 229It 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 railwaysBoth GSM-R and MFCN (Mobile Fixed Communications Network) licensees use the radio spectrum in compliance with the relevant European and national regulationsRealistic UMTS and LTE signals have lower unwanted emission levels (10 to 20dB) than specifiedMeasurement campaigns performed in 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 operationWideband signals impact the whole GSM-R frequency range. UMTS, LTE/5 MHz and LTE/10 MHz have the same interference potential
11Draft ECC Report 229In order to successfully mitigate interferences due to blocking and intermodulation, the standard relevant for GSM-R radios (ETSI TS ) was improved with respect to the receiver characteristics and published in August 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 networksA coordination/cooperation process should be used before, during and after the transition period towards improved GSM-R receiversThe 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
12Draft ECC Report 229A 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 processThe proposed generic coordination/cooperation process can be adapted to meet national needs and remain a national decision, noting that existing processes are already in useTo support the technical analysis, a single agree electronic tool could be developed, based on SEAMCAT; this is currently under investigation.
14Roadmap Approval ECC Report 229 9-13 FEB 2015: WGFM#82 approves draft ECC Report 229 for public consultationBeginning of March – mid April 2015: public consultation process18-22 May 2015: WGFM#83 approves ECC Report 229 for publication25 May 2015: publicationUsing 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.