IEC TS 62773:2014

IEC TS 62773 ®
Edition 1.0 2014-04
TECHNICAL
SPECIFICATION
colour
inside
Railway applications – Procedure to determine the performance requirements
for radio systems applied to radio-based train control systems

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing more than 30 000 terms and
Technical Specifications, Technical Reports and other definitions in English and French, with equivalent terms in 14
documents. Available for PC, Mac OS, Android Tablets and additional languages. Also known as the International
iPad. Electrotechnical Vocabulary (IEV) online.

IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a More than 55 000 electrotechnical terminology entries in
variety of criteria (reference number, text, technical English and French extracted from the Terms and Definitions
committee,…). It also gives information on projects, replaced clause of IEC publications issued since 2002. Some entries
and withdrawn publications. have been collected from earlier publications of IEC TC 37,

77, 86 and CISPR.
IEC Just Published - webstore.iec.ch/justpublished

Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
IEC TS 62773 ®
Edition 1.0 2014-04
TECHNICAL
SPECIFICATION
colour
inside
Railway applications – Procedure to determine the performance requirements

for radio systems applied to radio-based train control systems

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
X
ICS 45.060 ISBN 978-2-8322-1519-7

– 2 – IEC TS 62773:2014 © IEC 2014
CONTENTS
FOREWORD . 5
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviations . 8
3.1 Terms and definitions. 8
3.2 Abbreviations . 9
4 Outline of the process for determining performance requirements . 9
5 Definition of preconditions on available spectrum . 11
5.1 Environmental conditions . 11
5.1.1 General . 11
5.1.2 Obstacle . 11
5.1.3 Climate conditions . 12
5.1.4 Electromagnetic interference . 12
5.2 Regulatory constraints . 12
6 Definition of preconditions on railway operation . 12
6.1 Railway line conditions . 12
6.1.1 General . 12
6.1.2 Line maximum speed . 12
6.1.3 Track conditions . 13
6.1.4 Line configurations . 13
6.1.5 Station configurations . 13
6.2 Operational conditions . 13
6.2.1 General . 13
6.2.2 Minimum design headway . 13
6.2.3 Maximum number of trains in one control area . 13
6.3 TC communication requirement . 14
6.3.1 Maximum tolerable loss of communication . 14
6.3.2 Network latency . 14
6.3.3 TC transmission period . 14
6.3.4 TC throughput . 14
6.3.5 Control area . 14
6.3.6 Maintenance conditions . 14
6.4 Required type of transmission . 14
7 Radio parameters . 15
7.1 General . 15
7.2 Security parameters . 15
7.3 Transmission parameters . 15
8 Relationship between preconditions and radio parameters. 15
8.1 General . 15
8.2 Environmental conditions . 17
8.2.1 Obstacle and radio parameters . 17
8.2.2 Climate conditions and radio parameters . 18
8.2.3 Electromagnetic Interference and radio parameters . 19
8.3 Regulatory constraints and radio parameters . 20
8.4 Railway line conditions . 21

8.4.1 Line maximum speed and radio parameters . 21
8.4.2 Track conditions and radio parameters . 22
8.4.3 Line configurations and radio parameters . 23
8.4.4 Station configuration and radio parameters . 24
8.5 Operational conditions . 25
8.5.1 Minimum design headway and radio parameters . 25
8.5.2 Maximum number of trains in one control area and radio parameters. 26
8.6 TC communication requirement . 27
8.6.1 Maximum tolerable loss of communication and radio parameters . 27
8.6.2 Network latency and radio parameters . 28
8.6.3 TC transmission period and radio parameters . 29
8.6.4 TC throughput and radio parameters . 30
8.6.5 Control area and radio parameters . 31
8.6.6 Maintenance conditions and radio parameters . 32
8.7 Required type of transmission and radio parameters . 32
Annex A (informative) Additional preconditions . 33
A.1 Operational conditions . 33
A.1.1 Overlay on existing facilities . 33
A.1.2 Signal aspect . 33
A.1.3 Block . 33
A.2 System conditions . 33
A.2.1 General . 33
A.2.2 Train localization . 33
A.2.3 Continuous control/intermittent control . 34
A.2.4 Train protection profile . 34
A.2.5 System entry/exit . 34
A.2.6 Temporary speed restriction . 34
A.2.7 Emergency stop command . 34
A.2.8 Interlocking control/route control . 34
A.2.9 Level crossing control . 34
A.2.10 Couple and split a train . 34
A.2.11 Automatic train operation . 35
A.3 Relationship between preconditions and radio parameters . 35
A.3.1 General . 35
A.3.2 Operational conditions . 36
A.3.3 System conditions . 39
Annex B (informative) Considerations for in-continuity . 46
B.1 Communication in in-continuity . 46
B.2 Considerations for in-continuity in radio systems. 46
B.2.1 General issues . 46
B.2.2 Specific issues related to failure caused by external system factors . 46
B.2.3 Specific issues related to failure caused by internal system factors . 46
Bibliography . 48

Figure 1 – Factors influencing performance requirements . 10
Figure 2 – Maximum number of trains in case of divided area . 13

Table 1 – List of preconditions and radio parameters . 11

– 4 – IEC TS 62773:2014 © IEC 2014
Table 2 – Relationship matrix between preconditions and radio parameters . 16
Table 3 – Obstacle and radio parameters. 17
Table 4 – Climate conditions and radio parameters .
...