packet switched technology etcs under gsm-r packet...
TRANSCRIPT
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Paris, 11.09.2013Packet Switched Mode for ETCSIngo Wendler - UIC
Packet Switched Technology
ETCS underGSM-R Packet ModeConditions
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Paris, 11.09.2013Packet Switched Mode for ETCSIngo Wendler - UIC
France Germany
Switzerland
High Density Area-Border Region
Packet Mode for ETCSMotivation
Status GSM-R Air-Int. 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
number of frequencies Capacity demand conflicts with the
limited GSM-R(EIRENE) frequencyband resources
Increase radio channel multiplexing keep QoS requirements transitiontowards packet switched mode
Circuit Mode-DedicatedChannel
Packet Mode-SharedChannel
Track High Density AreaStations
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Paris, 11.09.2013Packet Switched Mode for ETCSIngo Wendler - UIC
GSM-R ETCS Bearer ServiceCircuit(CS) versus Packet (PS)Mode
Circuit Mode Dedicated transmission resource
per ETCS session Average GSM-R traffic channel duty cycle
varies between 5% - 20% Sufficient transmission robustness
(Radio Network design) Low air interface transmission capacity
utilisationPacket Mode (GPRS/EGPRS)
Shared transmission resource(s) betweenseveral ETCS sessions
Bearer Service bandwidth depends on: Line Speed Radio Network design
Improved protection algorithms againsttransmission errors
Multiplexing of several ETCS sessionsimproves resource utilisation
CS ETCS
CS ETCS
CS ETCS
CS ETCS
PS ETCSPS ETCS
PS ETCS
PS ETCS
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Paris, 11.09.2013Packet Switched Mode for ETCSIngo Wendler - UIC
GSM-R ETCS Bearer ServiceCircuit (CS) versus Packet Switched (PS) Mode
Radio ResourceAllocation/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/withoutNetwork assistance
Traffic resources between targetcell and origin cell (Planning Task)
Handover (Network commanded)(Neither in Public-GSM nor inGSM-R Network/Mobile available)
Application - Prioritybased resourceallocation CS-Mode Dedicated transmission resource
- allocation ranking by pre-emption!
PS-Mode ETCS application typical machine to machine
interaction (location measurementto get track segment permission)
stringent and low delay realtime treatment
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Paris, 11.09.2013Packet Switched Mode for ETCSIngo Wendler - UIC
GSM-R GPRS/EGPRS3GPP GSM features
Radio ResourceAllocation/Release PS-Mode Delay transmission resource
release by the network
Features: Delayed-DL-TBF (Network) Extended-UL-TBF (Network/Mobile)
Abbreviations DL-Downlink UL-Uplink TBF- Temporary Block Flow
Mobility PS-Mode Reduce Cell Change
(Reselection) time
Feature: Network Assisted Cell Change
(Network/Mobile)
Application - Prioritybased resourceallocation PS-Mode Real Time treatment ETCS
application
Feature: Packet Flow Context
(Network/Mobile)
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Paris, 11.09.2013Packet Switched Mode for ETCSIngo Wendler - UIC
GSM-RGPRS/EGPRSBearer Service
GSM-R GPRS/EGPRSTest Cases(O-3023v0.73)3GPP Features Delayed DL-TBF Extended-UL-TBF Network Assisted Cell Change Packet Flow Context
TransportProtocol
Traffic Model 1- Limit Train-RBC every 3seconds 49 octets RBC-Train every 6 seconds 319 octets Reflects high GSM-R traffic channel utilisation
Traffic Model 2- Typical Train-RBC every 6seconds 49 octets RBC-Train every 20 seconds 319 octets Reflects medium GSM-R traffic channel utilisation
Mixed Traffic Application dependentbandwidth allocation/reservation Traffic Model 1 Best Effort data stream Traffic Model 2 Best Effort data stream
Number of Mobile Modules1 or 4 concurrent ETCS sessions
GSM-RPS-Bearer
GSM-RCS-Bearer
IP
Mobile Module
HDLC/LAPB
T.70
X.224
TransportTCP or UDP
Adapt.-Layer
Allocation Function
Safety Layer
ETCS-Application
Transport
Network
GPRS
Beare
r Serv
ice
EGPR
S Bea
rerSe
rvice
Test CaseDescription
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Paris, 11.09.2013Packet Switched Mode for ETCSIngo Wendler - UIC
GPRS/EGPRS Bearer ServiceOptimisation - Testing Procedure
ToolQualification
MeasurementTool
LAB Phase 117 Test Cases
LAB Phase 283 Test Cases
GSMFeatureActivation
Track34 Test Cases
PerformanceReferenceBest Effort
FeaturePerformanceGain
Final-LAB Parameter Timer
Robustness Parameter Timer
GSMFeatureQualification
Radio AccessTechnologyIndependent
Timestampgeneration
Transfer DelayComputation
Traffic ModelEmulation
Control of min.4 concurrentMobile Modules
Reporting
Finished On-goingFinished
Mixed Traffic(ETCS/Non-ETCS)
Automated Cell Change
ETCS Traffic Model Traffic Model 1 Traffic Model 2
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Paris, 11.09.2013Packet Switched Mode for ETCSIngo Wendler - UIC
GPRS/EGPRS - ETCS Bearer ServiceTest Results
4 concurrent ETCS sessions Confirmed by LAB and
on-going Track testing
Mul
tiple
xing
Gai
non
eG
SM-R
Traf
ficC
hann
el
Impa
ctC
S
PSM
ode Circuit and Packet Mode
Co-existence guaranteed-Matter of GSM-R capacityplanning
Requires one dedicatedPacket Mode Traffic Channel!
3GPP GSM features improvestransfer delay significantly
(TTD) equal/better thanCS-Mode for ETCS
Recovery of erroneous packetsfaster than in CS-modeT
rans
mis
sion
Tran
sfer
Del
ay/
Rob
ustn
ess
CS ETCS
PS ETCS
PS-Mode
PS-Mode
CS-Mode
PS ETCS
PS ETCS
PS ETCS
PS ETCS
PS ETCS
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Paris, 11.09.2013Packet Switched Mode for ETCSIngo Wendler - UIC
GPRS/EGPRS - ETCS Bearer ServiceConclusions
Can enable (future proof) IPbased communication for ETCS!
(UIC) Measurement-ToolIndependent to Radio Access
Technology --> LTE etc.
GPRS/EGPRScan provide
traffic capacityimprovement!
GPRS/EGPRSEngineeringGuidelines
Specific GPRS/EGPRS timer andalgorithms adjustments are
necessary!
Can improveETCS
transmissionrobustness!
No specific3GPP GSM-Rfeatures are
required!
TransformationBest Effort
QoSTransmission
System
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Paris, 11.09.2013Packet Switched Mode for ETCSIngo Wendler - UIC
Thank You
for the support of all involved parties!
Comtest Wireless International
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