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GSM-R performances in High Speed Railway Environments

GSM-R performances in High Speed Railway Environments. Requirements at GSM-Rail bearer for ETCS usage. Version t. GSM-Rail performance requirements for ETCS: whether this requirement needs to be this fierce for ETCS are the QoS requirements beyond the limitations of GSM-R network technology

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GSM-R performances in High Speed Railway Environments

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  1. GSM-R performances in High Speed Railway Environments Requirements at GSM-Rail bearer for ETCS usage Version t

  2. GSM-Rail performance requirements for ETCS: • whether this requirement needs to be this fierce for ETCS • are the QoS requirements beyond the limitations of GSM-R network technology • do the current specifications reflect the quality in the GSM-R data transmission sufficiently. GSM-Rail Performance in High Speed Railway Environments

  3. Dick Vriend • Test Manager GSM-Rail, the Netherlands • Period 2001 - Present • Low speed tracks (National railways) • 3,000 km • 130 kmph max • Voice communication • Freight Line (Betuweroute) • ETCS Level 2 • 160 km • 130 kmph max • High Speed Line • ETCS Level 2 • 100 km • 330 kmph max GSM-Rail Performance in High Speed Railway Environments

  4. National railways, 3,000 km HSL: 125 km Amsterdam HSL-zuid Rotterdam Betuweroute: 160 km Betuweroute Germany Sites Belgium Brussel GSM-Rail Performance in High Speed Railway Environments

  5. GSM-Rail Performance in High Speed Railway Environments

  6. GSM-Rail characteristics: • Downlink: 921 – 925 MHz • Uplink: 876 – 880 MHz • 200 kHz channel spacing • 19 GSM-R ARFCN channels from #955 to #973 • Next to E-GSM (974) • 45 MHz channel separation • FDMA / TDMA • Coverage sectorised only (azimuth 60 or 30 degrees) • convolutional encoding and block interleaving • No frequency hopping • Location Dependent addressing / Functional Addressing • BTS output power: 50 watt / 47 dBm • Radio module: 8 watt / 39 dBm • circuit switched GSM-Rail Performance in High Speed Railway Environments

  7. GSM-Rail Performance in High Speed Railway Environments

  8. NSS BSS Um ISDN ETCS Communication RBC / Inter- locking Mobile TE Onboard Unit GSM-Rail Performance in High Speed Railway Environments

  9. NSS BSS Um ISDN End-to-End measurement setup between IGSM and Ifix IGSM Ifix RBC / Inter- locking Mobile TE Onboard Unit Um GSM-Rail Performance in High Speed Railway Environments

  10. End-to-End measurement setup between IGSM and Ifix RBC Inter- locking How to determine the End-to-End Transmission Quality ? GSM-Rail Performance in High Speed Railway Environments

  11. NSS BSS Um ISDN uplink 9,600 bps, V.110 protocol transparent bearer downlink ETCS Communication IGSM Ifix RBC / Inter- locking Mobile TE 22:09:54.930> 123: mP Jules 22:09:54.930> 124: mP Jules 22:09:54.930> 125: mP Jules 22:09:54.930> 126: mP Jules 22:09:54.930> 127: mP Jules 22:09:54.930> 127: mP Jules Onboard Unit 22:09:54.930> 123: mP Jules 22:09:54.930> 124: mP Jules 22:09:54.930> 125: mP Jules 22:09:54.930> 126: mP Jules 22:09:54.930> 127: mP Jules 22:09:54.930> 127: mP Jules GSM-Rail Performance in High Speed Railway Environments

  12. Number of received frames in error FER = Total number of received frames Datagram 30 octects Number of received bits in error 2,000 bits in error BER = = 0.5 x 10-4 Total number of received bits 40,000,000 total bits Bit in Error Error free Bit stream GSM-Rail Performance in High Speed Railway Environments

  13. < 1 sec > 7 sec Transmission Interference Rate / TIR TIR Violation if EP>1 sec or EFP<7 sec Requirement: < 1 violation per 100 hrs Requirement: < 1 violation per 400 hrs Periods in error Datagram in error Datagram error free error free periods (EFP) = datagram of 30 octets GSM-Rail Performance in High Speed Railway Environments

  14. handover Handover zone Datagram in error Datagram error free = datagram of 30 octets GSM-Rail Performance in High Speed Railway Environments

  15. 1 bit error -> datagram -> ca 31 millisecond handover = TIR violation Time < 7 seconds Handover zone Datagram in error Datagram error free = datagram of 30 octets GSM-Rail Performance in High Speed Railway Environments

  16. handover Handover zone Datagram in error Datagram error free = datagram of 30 octets GSM-Rail Performance in High Speed Railway Environments

  17. TIR violation ? 1 error-free received datagram Handover zone handover Datagram in error Datagram error free = datagram of 30 octets GSM-Rail Performance in High Speed Railway Environments

  18. TIR violation ? 1 error-free received datagram Handover zone handover Datagram in error Datagram error free = datagram of 30 octets GSM-Rail Performance in High Speed Railway Environments

  19. 22:09:54.930> 123: mP Jules • 22:09:54.980> 124: mP Jules • 22:09:55.030> 125: mP Jules • 22:09:55.090> 126: mP Jules • 22:09:55.140> 127: mP Jules • 22:09:55.180> 128: mP Jules • 22:09:55.240> 129: mP Jules • 22:09:55.300> 130: mP Jules • 22:09:55.360> 131: mP Jules Received datagrams of 30 octets GSM-Rail Performance in High Speed Railway Environments

  20. = TIR violation • 22:09:54.930> 123: mP Jules • 22:09:55.vb n 124: mP Jules • 22:09:54.980> 125: mP Jules • 22:09:55.030> 126: mP Jules • 22:09:55.140> 127: mP Jules • 22:09:55.180> 128: mP Jules • 22:09:55.300> 130: mP Jules • 22:09:55.390> 130: mP Jules Htregfvhrevfjjgfdfdjbv trYYles • 22:09:55.360> 132: mP Jules Received datagrams of 30 octets EFP < 7 sec GSM-Rail Performance in High Speed Railway Environments

  21. TIR violation ?? • 22:09:54.930> 123: mP Jules • 22:09:54.980> 124: mP Jules • 22:09:55.030> 125: mP Jules • 22:09:55.090> 126: mP JulesËŒ • 22:09:55.140> 127: mP Jules • 22:09:55.180> 128: mP Jules • 22:09:55.240> 129: mP Jules • 22:09:55.300> 130: mP Jules • 22:09:55.360> 131: mP Jules Received datagrams of 30 octets YES, If checked on send versus received No, If checked on CRC16 GSM-Rail Performance in High Speed Railway Environments

  22. Previous version Subset-093: 1 / 7 seconds rule (Error Period / Error-free period Latest version Subset-093: Considering all periods: 99% of all periods in error < 1.0 seconds 95% of all periods in error < 0.8 seconds 99% of all periods in error < 1.0 seconds 95% of all periods in error < 0.8 seconds 99% of all error-free periods > 7 seconds 95% of all error-free periods > 20 seconds 99% of all error-free periods > 7 seconds 95% of all error-free periods > 20 seconds GSM-Rail Performance in High Speed Railway Environments

  23. Handover zones 7 sec 30 sec 20 sec 20 sec 7 sec 5 – 6 km or 60 sec • A random bit error causes a TIR violation: • on 20 sec: 67% • on 7 sec: 25% 300 kmph 5 km per 60 sec GSM-Rail Performance in High Speed Railway Environments

  24. GSM-Rail performance Requirements for ETCS: • whether this requirement needs to be this fierce for ETCS • are the QoS requirements beyond the limitations of GSM-R network technology • do the current specifications reflect the quality in the GSM-R data transmission sufficiently. GSM-Rail Performance in High Speed Railway Environments

  25. GSM-Rail performance Requirements for ETCS: • whether this requirement needs to be this fierce for ETCS • ETCS as safety system requires reliable / high quality data link • GSM-R widely used in Europe • Current high specifications not been demonstrated yet • No indications from ETCS industry or Railway operators that GSM-R is not sufficient • are the QoS requirements beyond the limitations of GSM-R network technology • do the current specifications reflect the quality in the GSM-R data transmission sufficiently. GSM-Rail Performance in High Speed Railway Environments

  26. GSM-Rail performance Requirements for ETCS: • whether this requirement needs to be this fierce for ETCS • are the QoS requirements beyond the limitations of GSM-R network technology • GSM-R radio modules • GSM air interface • Difference test trajectories versus operational networks • do the current specifications reflect the quality in the GSM-R data transmission sufficiently. GSM-Rail Performance in High Speed Railway Environments

  27. GSM-Rail performance Requirements for ETCS: • whether this requirement needs to be this fierce for ETCS • are the QoS requirements beyond the limitations of GSM-R network technology • do the current specifications reflect the quality in the GSM-R data transmission sufficiently. • TIR specification still evolving • Not yet finalized GSM-Rail Performance in High Speed Railway Environments

  28. ERTMS = ETCS && GSM-R JOINT APPROACH GSM-Rail Performance in High Speed Railway Environments

  29. GSM-R performances in High Speed Railway Environments Thanks for your attention Dick Vriend dick.vriend@capgemini.com +31 6 4792 4153

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