John HarmerUnisigEuroRadio WG

GSM-R Quality of Service for ETCS

Chiel SpaansGSM-REuroRadio WG

The Railways perspective ...

• Safety

• Capacity

• Reliability

• Interoperability

Railway Requirements for ETCS

Train Operators are requiring a Railway

Infrastructure which delivers:

• a high speed line

• a high capacity line

• a low capacity line

• an urban railway

• and a freight-only line.

Railway Requirements for ETCS

Different requirements for:

• train awakening

• entering a Level 2 area

• extending a Movement Authority

• RBC handover

• crossing a border

ETCS Scenarios

Normal Scenarios:

• Train doesn’t wake up

• No network found

• Losing RBC connection

• Errors during transmission

• Etc.

ETCS Scenarios

Error Scenarios:

The Industry perspective ...

The standardisation process:

• Railways requirements

• Unisig specifications

• GSM-R Operators Group specifications

Structure

or...

EEIG

UNISIG

GSM-R

REQUIREMENTS

REALITY

Structure

Quality of Service, or "QoS"

• a way of stating a requirement

What is QoS?

• for general communications...

• Connection establishment delay

• Connection establishment failure probability

• Maximum/ Average/ Minimum Data Rate

• Transfer Delay

• Transfer Delay variation

• Error ratio

• Priority

• Security, leading to

a QoS Parameter Set

Communications QoSTypical parameters:

we all use this

- without realising...

• Starter

• Main Course

• Dessert

• Beer, wine, coffee

• Cost

• but parameter depends on:

• Time of day? Location? Previous meal?

• leads to...

a QoS Parameter Set.

Food & Drink QoSTypical parameters:

• Network registration delay

• Connection establishment delay

• Connection establishment error rate

• Transfer delay

• Transmission interference rate

• Connection loss rate

• Service availability

• Re-connection time?

• but what is the network...

ERTMS Parameters

the Data Path

FixedNetwork

Side(Infra

operator) Mobile Side(train operator)

GSM-RMOBILE

ETCSOn-board

RBC

VPN

GSM-R

BSCMSC

BTS

GSM-R(networkoperator)

Example 1: Delay

high speed

regional

4s 8s 12s

48.7%<4s

92.9%<7s 99.9964%

<12 s

0s

• realise call has dropped

• re-establish call

• setup safe connection

Example 2: Call drop

10s

15s

8s

33s

no GSM authentication or ciphering

7s

25sfast call setup

7s

24s

• Railway Requirements

• Unisig Class 1 Subset093

• FFFIS for Euroradio

• GSM-R Test Specification

• Eirene FRS

Documents

• Unisig Class 1 Subset093

and what next...

The Future ...

Operational Cases

• Border crossing

• QoS impact analysis for different

types of lines?

Next Steps

Test Tools

• Specification

• Standardisation

Next Steps

Validation

• GSM-R only

• End to End Communication

Any Questions ?

Chiel Spaans

John Harmer

john.harmer@invensys.com

chiel.spaans@prorail.nl