1. 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

2. 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

3. Where does the action take place?

6. Interference Mechanisms (1)
925 MHz
GSM-R channel
Unwanted emissions from UMTS/LTE in the GSM-R channel

7. Interference Mechanisms (2)
Max. mixer power
Min. S/N
Receiver blocking due to high input powers

8. Interference Mechanisms (3)
GSM-R channel
fIM
fIM = 2*f1-f2
Receiver intermodulation (2 narrowband signals)

9. Interference Mechanisms (4)
921.2MHz
924.8MHz
UMTS
GSM
UMTS signal IM products (all) IM frequencies involved when GSM-R frequency is MHz IM frequencies involved when GSM-R frequency is MHz
Receiver intermodulation (1 wideband signal)

10. 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 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

11. Draft ECC Report 229
In 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 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

12. 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.

13. Coordination/cooperation process

14. 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.

15. Thank you for you attention
Questions??