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ERTMS Platform – Paris 26.03.2008 1

GSM-R Report to the ERTMS Platform

Klaus KonradGSM-R Project ManagerDan MandocUIC


ContentContent

GPRS Quality of Service Test CasesGPRS GPRS QualityQuality of Service Test Casesof Service Test Cases111

GSM-R Frequency Capacity StudyGSMGSM--R R FrequencyFrequency CapacityCapacity StudyStudy222

Additional FrequenciesAdditionalAdditional FrequenciesFrequencies333

Frequency InterferencesFrequencyFrequency InterferencesInterferences444

EIRENE Versions 8/16EIRENE EIRENE VersionsVersions 8/168/16555

GSM-R Version ManagementGSMGSM--R R VersionVersion ManagementManagement666

EIRENE Options ReviewEIRENE EIRENE OptionsOptions ReviewReview777


1.GPRS Performance Measurements for ETCS

Workshop held in Paris, UIC HQ, 11.February 2008


Meeting expectations

1. GPRS for ETCS test pre-conditions, following the RFI experience and the UNISIG papers, in the context of using standard GPRS and not to build a GPRS-R

2. GSM-R Frequency Capacity Study followed by Packet Switching for ETCS Capacity Study pre-conditions


In the context of the packet switch data change request (CR 741 & CR 769), UNISIG has produced position paper:“GPRS Compatibility with EuroRadio and data Transmission”

Conclusions of the document:

A positive approach:

” When GPRS is applied, GSM-R network capacity problems could be solved or reduced “

But…

There are concerns about fulfillment of ETCS requirements

Details


GPRS for ETCS OverviewFor a packet switched data service, the main influences on the end-to-end data transfer are:

• Data rate;• Network load; • Transmission errors;• Cell re-selection;• Temporary out of service conditions, caused by, for example, insufficient

coverage, radio propagation interference etc.• Temporary Block Flow: "GPRS also suffers from TBF loss, caused by radio. TBF

drop rate is typically from 5 to 10% of TBF. In case of a TBF loss, there is an interruption of data of about 5s.” (Nortel)

UNISIG Conclusion:• “We think the 'normal' increase in transmission delay (compared

with those identified in the next sections), will not be critical, but TBF loss is of concern and needs testing in a railway environment”


Quality of ServiceSubset 093 has to be updated with additional QoS parameters to cover GPRS.

The EuroRadio FFFIS will have to specify a recommendation for efficient QoSmanagement inside GPRS UNISIG Conclusion:

“In practice we do not think QoSwill be a problem, (…) but should be checked by measurements.”


RFI Tests• In summer 2007, RFI has executed GPRS tests, static

tests in their test laboratory as well as live tests on the Roma –Naples and Turin – Novara HSL lines, with encouraging results.

• The purpose of the test was different, (network capability to transmit large multimedia files) but it showed a good functionality of the network; the results can be an excellent starting point for GPRS Quality of Service Tests.


Conclusions from the RFI Tests• At 300 km/h GPRS was stable.• CSD and PSD were proved to well co-exist , as well

as PSD and ASCI• In the same cell not a single packet was lost• In live tests, only small degradations of transfer speed

and round trip delay compared with static tests were noticeable

• During Cell Changes/Cell Updates there was a 3 to 4 seconds outage

• (CSD = Circuit Switched Data; PSD = Packet Switched Data -GPRS)


ETCS Application Characteristics

• Small application messages are sent periodically, which requires a minimum bandwidth (9600 bps)

• There are messages sent from OBU to RBC , as well as from RBC to OBU

GPRS aims, in order to be suitable for ETCS:• Minimize the message delays• Reliable data transfer

• The protocol to be used should be TCP/IP, due to its transport layer recovery mechanism (at the application layer the message will not be lost, but rather delayed)


GPRS Performance for ETCS• As primary target we will measure the message delay, in the

context of rather small messages, with a 10 to 30 s repetition time, depending on the RFI test conditions.

The test content:

1. Application message delay distribution in the uplink and downlink

2. Distribution of Round Trip Time 3. Percentage and cause of lost or corrupted messages 4. Connection setup time, percentage of connection losses,

duration of interruptions of message flow

• Reliable data and throughput should come then as a secondary target, based on the results from the first set of measurements


Timetable for the GPRS Tests• Draft Test Cases should be produced until mid of March (2008)

(Note: the draft test cases are produced, they will be sent to RFI by the end of this week)

• RFI will start processing the test proposal beginning end of March.

• Based on the tests characteristic a free period might be found for RFI Lab, to perform the tests, maybe beginning of April.

• The results shall be presented in a workshop with participants from all interested parties: UNISIG, GSM-R IG, ERIG Members, ERA, CER, EIM.


Banverket GPRS measurement

• In the same time……• BV is currently using GPRS in order to send a 100

Bytes file containing a time stamp, energy metering and train maintenance data

• The aim is to measure the end to end for the packet transmission already existing, on the network side.

• We are searching for a procedure to measure the streams, without disturbing the existing working system

• The time frame is the same with the RFI tests


GPRS Quality of Service Test CasesGPRS Quality of Service Test CasesGPRS Quality of Service Test Cases111



Frequency interferencesFrequencyFrequency interferencesinterferences444

EIRENE 8/16EIRENE 8/16EIRENE 8/16555




GSM-R Frequency Capacity Study

1. 2 sites selected: Paris (Paris Nord + Paris Est) and Mannheim. Network Rail study about the PS impact in congested areas like Clapham Junction could be included

2. All applications should be taken into consideration, existing ones and future planned ones

1. Modeling for CSD, also mixed environment : CSD plus PSD (PS solution has to be backward compatible)


• There is a new proposal from ECC, for usage of a part of the so called Trunk Band (2, maybe 3 MHz), both uplink and downlink, that means 870 – 876 MHz / 915 – 921 MHz

• Such solution seems to be one of the few choices for additional harmonized frequencies, with real chances

TRUNK Band UIC Direct

Mode

GSM -R

Band

E -GSM

Band

P -GSM

Band

870MHz 876MHz 880.0MHz 890MHz 915MHz

915MHz 921MHz 921.1MHz 925MHz 935MHz 960MHz

Mobile Transmit

Base Station Transmit

UIC Band

876.1MHz


• This solution, in case of networks already migrated, involve expenses for modifying the networks and the mobiles, as the GSM-R mobiles are designed to work in the GSM-R, E-GSM and P-GSM band, and not in the Trunk Band

• Therefore it should be noted that in a first stage, it shall be not used for interoperable applications, but for “local” ones, like shunting, maintenance, etc.

• This should not stop the lobbying to obtain additional frequencies in the E-Band, which in the actual context of flexible bands proposal seems having really small chances as an European harmonized solution





Frequency InterferencesFrequencyFrequency InterferencesInterferences444





• In order to have a clear view on the impact that UMTS900 signals could have on cab radios, RHK has initiated tests in Nokia laboratory, where most of the cab radio suppliers were present.

• In the tests real conditions were simulated (real UMTS 900 signal and real GSM signal), and not modeling.

• The purpose was to identify the cab radio blocking conditions, compared with the GSM interference, and also to verify the assumptions from the ECC Report 96.

• The tests went well, and the results are analyzed now in the UIC GSM-R Operators Group.


• For EIRENE 8/16, the work of the UIC ERIG groups, FG and OG is almost finalized The delta major points are:

• Improved shunting specs, based on the proposals of the shunting user group (assessed by GSM-R IG)

• eREC ( enhanced Railway Emergency Call)• QoS values from Subset 093 and O-2475 to be included in

EIRENE• Dispatcher enhanced functionalities• Improved All drivers in the Area Functionality• Improved Border Crossing Functionality • The target to send the CRs approved by GSM-R IG, into the

CC circuit, is still autumn 2008


• GSM-R Version Management is seen by ERIG groups as an important matter, even not being critical for 8/16

• We had several conf calls and 3 meetings with GSM-R IG, and we reached now version 0.6 of the VM document

• UIC understands the industry concerns, but wishes that also the railway points of view are taken into consideration

• GSM-R IG has asked for a maxim focus on this matter, and decided to concentrate most of their resources on this, with thetarget to have it decided and workable already for the versions 8/16


• GSM-R is a stable system and it is proven to work well.

• Nevertheless, interoperability issues still appear and one of the identified reasons is the use of optional requirements from national side as an access criterion for foreign incoming trains

• In order to close such a gap possibility, there is a decision that at ERA level an EIRENE Options Review Group should study this matter


• The group has been set-up, and it has participants from CER, EIM,UIC, GSM-R IG, UNISIG and ERA

• We had 2 meetings, and now the group is on a good way• UIC has decided to support the actions through ERIG in order

to have a clear view from all members in usage of the EIRENE options and the proposals for changes. A questionnaire has been distributed by UIC to ERIG members and answers are expected before the next group meeting.

• A major proposal is also to modify the options definition in such a way, that it should not be possible to use nationally an option and make it mandatory and as an access criteria for a foreign incoming train.


GSM-R in Europe

• 67% of the existing network is foreseen to be covered with GSM-R

147719 km• From this, 43,3% is

constructed, and 35,5% is in operation !

52101km• 5 countries have finalized

the implementation or first step implementation:Germany, Italy, Netherlands, Norway and Sweden


GSM-R in Europe

Start of Implementation / In Service / Migrated GSM-R Networks

1995 2000 2005 2010 2015

OBB

SNCB

BDZ

HZ

SŽDC

BDK

RHK

RFF

DB Netz

OSE

MAV

RFI

CFL

Prorail

JBV

PKP

REFER

CFR

ZSR

SZ

ADIF

BV

SBB

UK

Start of Implementation

In Service

Migrated

From the 321.833 Mobile Users Planned, 120.953 are already activated, whichmeans 37,5%

25.901 Cab Radios are activated


Thank you

Questions?

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