Istanbul, April.2014GSM-R Packet Switched Technology Ingo Wendler / UIC Project Manager - ETCS over GPRS GSM-R Packet Switched Technology Introduction of GPRS/EGPRS for ETCS

Istanbul, April.2014GSM-R Packet Switched Technology Ingo Wendler / UIC Project Manager - ETCS over GPRS France Germany Switzerland High Density Area-Border Region (1) Packet Mode for ETCS Motivation Status GSM-R Air-Interface Capacity  ETCS data application widely used in low density areas (track)  What about high density areas like stations?  Voice capacity demand increases!  ETCS in stations demands additional Circuit Mode channels!  Border regions have to share the limited number of frequencies  Capacity demand conflicts with the limited GSM-R(EIRENE) frequency band resources  Increase radio channel multiplexing – keep QoS requirements  transition towards packet switched mode Circuit Mode- Dedicated Channel Packet Mode- Shared Channel Track High Density Area Stations

Istanbul, April.2014GSM-R Packet Switched Technology Ingo Wendler / UIC Project Manager - ETCS over GPRS (2) GSM-R ETCS Bearer Circuit Switched (CS) versus Packet Switched Circuit Mode (CS-Mode)  Dedicated transmission resource per ETCS session  Sufficient transmission robustness (Radio Network design)  Low traffic channel capacity utilisation (10-20%) Packet Mode (PS-Mode GPRS/EDGE)  Shared transmission resource(s) between several ETCS sessions  Bearer Service bandwidth depends on:  Channel Coding (more/less robust against transmission errors caused by Doppler and Delay spread)  Radio Network design  Improved protection algorithms against transmission errors  Multiplexing of several ETCS sessions improves resource utilisation PS ETCS PS ETCS PS ETCS PS ETCS

Istanbul, April.2014GSM-R Packet Switched Technology Ingo Wendler / UIC Project Manager - ETCS over GPRS (3) GSM-R ETCS Bearer C ircuit (CS) versus Packet Switched (PS) Mode Radio Resource Allocation/Release CS-Mode End User resource demand End User release resource PS-Mode End User demand Network release Mobility CS-Mode Handover (Network commanded) dedicated resources in source and target cell PS-Mode Cell Change (Reselection) Mobile self sustaining with/without Network assistance Traffic resources between target cell and origin cell (Planning Task) Handover (Network commanded) (Neither in Public-GSM nor in GSM-R Network/Mobile available) Application - Priority based resource allocation CS-Mode Dedicated transmission resource - allocation – ranking by pre- emption! PS-Mode ETCS application typical machine to machine interaction (location measurement to get track segment permission) stringent and low delay  real time treatment

Istanbul, April.2014GSM-R Packet Switched Technology Ingo Wendler / UIC Project Manager - ETCS over GPRS (4) GSM-R GPRS/EDGE Test Cases(O-3023v0.73) User Area - ETCS traffic emulation Traffic Model 1 - Limit Reflects high radio traffic channel utilisation Message frequency  every 3 seconds Train  RBC  every 6 seconds RBC  Train Traffic Model 2 - Typical Reflects medium traffic channel utilisation Message frequency  every 6 seconds Train  RBC  every 20 seconds RBC  Train Mixed Traffic – Application dependent bandwidth allocation Traffic Model 1/2 + non-ETCS data Network Registration Boundary Test Conditions Variation of Channel Coding (GPRS/EDGE) Variation of Radio Traffic Channel quantity Variation in ETCS Session quantity sharing one Radio Traffic Channel Variation of Radio Channel Conditions (Optimum  320km/h) GSM System 3GPP Features to improve PS-Mode: Radio Resources Allocation respecting ETCS application Mobility behaviour (Cell Change) Ensure ETCS application precedence over non-ETCS traffic Specific Test Conditions Test Case Focus GSM Feature Gain Multiplexing Gain of one Radio Traffic Channel GPRS/EDGE robustness CS-Mode and GPRS/EDGE co- existence IP-performance for transport layer parameterization

Istanbul, April.2014GSM-R Packet Switched Technology Ingo Wendler / UIC Project Manager - ETCS over GPRS Track (Ø 50km/h up to 320km/h LAB Phase 2 (Optimum Radio) LAB Phase 1 (Optimum Radio) (5) GPRS/EDGE Bearer Optimisation - Testing Procedure Measurement Tool GSM Feature Activation Performance Reference “Best Effort” Feature Gain IP-Performance Final-LAB Parameter Timer Robustness Parameter Timer GSM Feature Qualification Radio Access Technology Independent Timestamp generation Transfer Delay Computation Traffic Model Emulation Control of min. 4 concurrent Mobile Modules Reporting Finished Mixed Traffic (ETCS/Non-ETCS) Automated Cell Change ETCS Traffic Model Traffic Model 1 Traffic Model 2 Tool Qualification

Istanbul, April.2014GSM-R Packet Switched Technology Ingo Wendler / UIC Project Manager - ETCS over GPRS (6) GSM-R GPRS/EDGE Results: Feature Gain Radio Resource Allocation/Release Features: Delayed-Downlink-TBF (Network) Extended-Uplink-TBF (Network/Mobile) (TBF -Temporary Block Flow) Mobility Feature: Network Assisted Cell Change (Network/Mobile) Application - Priority based resource allocation Feature: Packet Flow Context (Network/Mobile) (GBR Guaranteed Bit Rate)

Istanbul, April.2014GSM-R Packet Switched Technology Ingo Wendler / UIC Project Manager - ETCS over GPRS (7) GPRS/EDGE - ETCS Bearer Results: 4 concurrent ETCS 6 concurrent ETCS sessions under static conditions Multiplexing Gain one GSM-R Traffic Channel Impact Circuit  Packet Mode Co-existence guaranteed- matter of GSM-R capacity planning Requires min. one dedicated Packet Mode Traffic Channel 3GPP GSM features improves transfer delay significantly (TTD) equal/better than Circuit Mode for ETCS Recovery of erroneous packets faster than in Circuit Mode T ransmission T ransfer D elay / Robustness CS ETCS PS ETCS PS-Mode CS-Mode PS ETCS PS ETCS PS ETCS PS ETCS

Istanbul, April.2014GSM-R Packet Switched Technology Ingo Wendler / UIC Project Manager - ETCS over GPRS Operation of the required features Planning recommendation (Min. Packet Switched capacity, Channel Coding) (8) GPRS/EDGE - ETCS Bearer Related Documents Transport Channel qualification Transfer Delay (Transmission Interference – Transport Protocol impact) Multiplexing Gain –New! Subset093 Bearer Service QoS PS-Mode Engineering 3GPP GSM feature specification MRM/Network PS-Mode functions Full Qualified Domain Name(s) RBC / OBU Identification IP Addressing Scheme EIRENE SRS/FRS

Istanbul, April.2014GSM-R Packet Switched Technology Ingo Wendler / UIC Project Manager - ETCS over GPRS (9) GPRS/EDGE - ETCS Bearer Conclusion(s) Transformation Best Effort  “QoS Transmission System ” 3GPP Features Standard features are sufficient to fulfil application QoS requirements Robustness Faster detection and retransmission of erroneous radio blocks with less impact to higher layers PS-Mode (GPRS/EDGE) provides a capacity improvement especially in high density - railway traffic areas! Radio Access Technology Independent Measurement Tool  ETCS / non-ETCS Traffic Emulation  Transport Channel – System Qualification (i.e. Transfer Delay/Multiplexing Gain)