SIST EN ISO 13141:2016

SLOVENSKI STANDARD
01-april-2016
1DGRPHãþD
SIST-TS CEN ISO/TS 13141:2010
SIST-TS CEN ISO/TS 13141:2010/AC:2014
(OHNWURQVNRSRELUDQMHSULVWRMELQ/RNDOL]DFLMDSRYHþDQHJRVWRWHNRPXQLNDFLMH]D
DYWRQRPQHVLVWHPH,62
Electronic fee collection - Localisation augmentation communication for autonomous
systems (ISO 13141:2015)
Elektronische Gebührenerfassung - Genauere Ortsbestimmung für autonome Systeme
(ISO 13141:2015)
Perception de télépéage - Communications d'augmentation de localisations pour
systèmes autonomes (ISO 13141:2015)
Ta slovenski standard je istoveten z: EN ISO 13141:2015
ICS:
03.220.20 Cestni transport Road transport
35.240.60 Uporabniške rešitve IT v IT applications in transport
transportu in trgovini and trade
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 13141
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2015
EUROPÄISCHE NORM
ICS 03.220.20; 35.240.60 Supersedes CEN ISO/TS 13141:2010
English Version
Electronic fee collection - Localisation augmentation
communication for autonomous systems (ISO
13141:2015)
Perception de télépéage - Communications Elektronische Gebührenerfassung - Genauere
d'augmentation de localisations pour systèmes Ortsbestimmung für autonome Systeme (ISO
autonomes (ISO 13141:2015) 13141:2015)
This European Standard was approved by CEN on 24 October 2015.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 13141:2015 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 13141:2015) has been prepared by Technical Committee ISO/TC 204
"Intelligent transport systems" in collaboration with Technical Committee CEN/TC 278 “Intelligent
transport systems” the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2016, and conflicting national standards shall be
withdrawn at the latest by June 2016.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent
rights.
This document supersedes CEN ISO/TS 13141:2010.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 13141:2015 has been approved by CEN as EN ISO 13141:2015 without any modification.
INTERNATIONAL ISO
STANDARD 13141
First edition
2015-12-01
Electronic fee collection — Localisation
augmentation communication for
autonomous systems
Perception de télépéage — Communications d’augmentation de
localisations pour systèmes autonomes
Reference number
ISO 13141:2015(E)
©
ISO 2015
ISO 13141:2015(E)
© ISO 2015, Published in Switzerland
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form
or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior
written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of
the requester.
ISO copyright office
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2015 – All rights reserved

ISO 13141:2015(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 3
4 Abbreviated terms . 4
5 Application interface architecture . 5
5.1 General . 5
5.2 Services provided . 5
5.3 Attributes . 5
5.4 Contract and toll context . 5
5.5 Use of lower layers . 6
5.5.1 Supported DSRC communication stacks . 6
5.5.2 The use of the CEN DSRC stack . 6
6 Conformance requirements . 6
6.1 General . 6
6.2 Functional requirements . 7
6.2.1 Minimum supported transaction details . 7
6.2.2 Initialising communication . 7
6.2.3 Writing of data . 7
6.2.4 Termination of communication . 7
6.3 Security . 8
6.3.1 General. 8
6.3.2 Authentication of RSE — Access credentials . 8
6.3.3 Authentication of LAC Data. 8
7 Attributes . 8
7.1 General . 8
7.2 Data regarding location reference . 9
7.3 Operational data .10
7.4 OBE contractual data .10
7.5 Security-related data .11
8 Transaction model .11
8.1 General .11
8.2 Initialisation phase .12
8.2.1 General structure .12
8.2.2 LAC application-specific contents of the BST .12
8.2.3 LAC application-specific contents of the VST .12
8.3 Transaction phase .12
Annex A (normative) LAC data type specifications .13
Annex B (normative) PICS proforma for the data elements in the attribute .14
Annex C (informative) ETSI/ES 200-674-1 communication stack usage for LAC applications .21
Annex D (informative) IR communication usage for LAC applications .24
Annex E (informative) ARIB DSRC communication stack usage for LAC applications .25
Annex F (informative) LAC transaction example .27
Annex G (informative) Use of this International Standard for the EETS .29
Bibliography .31
ISO 13141:2015(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity
assessment, as well as information about ISO’s adherence to the WTO principles in the Technical
Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 204, Intelligent transport systems.
This first edition replaces ISO/TS 13141:2010, which has been technically revised. It also incorporates
ISO/TS 13141:2010/Cor1:2013. This first edition incorporates the following main modifications
compared to the previous Technical Specification:
− conversion from a Technical Specification to an International Standard;
− generalized container definition;
− amendments to reflect changes to the underlying base standards;
− addition of a new informative annex (i.e. Annex G) on how to use this International Standard for the
European electronic toll service;
− editorial and formal corrections as well as changes to improve readability.
iv © ISO 2015 – All rights reserved

ISO 13141:2015(E)
Introduction
On-board equipment (OBE) that uses satellite-based positioning technology to collect data required for
charging for the use of roads operates in a so-called autonomous way (i.e. generally without relying
on dedicated roadside infrastructure). However, these autonomous systems can, in particular places,
need some roadside infrastructure support for proper identification of charge objects. Such assistance
might be required at places where satellite-based localization accuracy or availability is insufficient or
at places where the OBE is directly informed about the identity of the relevant charge object.
In an interoperable environment, it is essential that this localization information be available in a
standardized way. This International Standard defines requirements for localization augmentation by
dedicated short-range communication (DSRC) between roadside equipment and on-board equipment.
This International Standard makes no assumptions about the operator of the roadside equipment
(RSE), in terms of his role according to ISO 17573, i.e. whether the RSE is operated by an entity in the
service provision role or in the toll charging role.
This International Standard has been prepared considering the following requirements:
— the localization augmentation communication (LAC) serves to transmit localization information to
passing OBE without identifying individual OBE;
— the localization information contains both geographical location independent of charging context,
and context-dependent identification of charge objects;
— a single roadside installation is able to provide localization augmentation for several overlapping
EFC contexts;
— this International Standard is based on the EFC architecture specified in ISO 17573;
— the communication applies to all OBE architectures;
— this International Standard is applicable to various DSRC media, especially the CEN DSRC stack;
— the communication supports security services for data origin authentication, integrity and non-
repudiation.
This International Standard defines an attribute, LACData, which is communicated from the RSE to
the OBE by means of an acknowledged writing service, which is implemented through the SET service
of DSRC Layer 7 (ISO 15628 and EN 12834). The LAC application is defined as a self-contained DSRC
application with its own application identifier (AID). Regarding the DSRC communications stack, this
International Standard gives definitions for the CEN DSRC stack, as used in EN 15509 and Annexes C,
D and E demonstrate, respectively, the use of ISO CALM IR, the use of Italian DSRC as specified in
ETSI/ES 200674-1 and ARIB DSRC.
All data relevant for the LAC application have been put into the attribute LACData, in order to create
a single standard communications content transmitted by LAC RSE, and always signed as a whole.
LACData can transport both geographic coordinates (latitude, longitude and altitude) and the
identification of a specific charge object. All elements of LACData are mandatory, but Null values are
defined to allow LAC installations to transmit only a selection of all defined data elements.
Access credentials are mandatory for writing LACData in order to protect OBE from non-authentic
RSE. LACData are critical for charge determination and for providing evidence. For these purposes, the
authenticators which are defined can be used to provide for data origin authentication, data integrity and
non-repudiation for LACData. There are two separate authenticator fields defined to allow for separate
authentication and non-repudiation, if required by the institutional arrangements of a toll system.
This International Standard is “minimalist” in the sense that it covers what is required by operational
systems and systems planned in the foreseeable future.
ISO 13141:2015(E)
A test suite for checking an OBE or RSE implementation for compliance with the ISO/TS 13141 is defined
in the corresponding edition of ISO/TS 13140-1 and ISO/TS 13140-2. This test suite is currently being
updated to reflect the changes incorporated into this first edition of ISO 13141.
vi © ISO 2015 – All rights reserved

INTERNATIONAL STANDARD ISO 13141:2015(E)
Electronic fee collection — Localisation augmentation
communication for autonomous systems
1 Scope
This International Standard establishes requirements for short-range communication for the purposes
of augmenting the localization in autonomous electronic fee collection (EFC) systems. Localization
augmentation serves to inform on-board equipment (OBE) about geographical location and the
identification of a charge object. This International Standard specifies the provision of location and
heading information and security means to protect from the manipulation of the OBE with false
roadside equipment (RSE).
The localization augmentation communication takes place between an OBE in a vehicle and fixed roadside
equipment. This International Standard is applicable to OBE in an autonomous mode of operation.
This International Standard defines attributes and functions for the purpose of localization
augmentation, by making use of the dedicated short-range communications (DSRC) communication
services provided by DSRC Layer 7, and makes these LAC attributes and functions available to the LAC
applications at the RSE and the OBE. Attributes and functions are defined on the level of Application
Data Units (ADUs, see Figure 1).
As depicted in Figure 1, this International Standard is applicable to:
— the application interface definition between OBE and RSE;
— the interface to the DSRC application layer, as specified in ISO 15628 and EN 12834;
— the use of the DSRC stack.
The localization augmentation communication is suitable for a range of short-range communication
media. This International Standard gives specific definitions regarding the CEN DSRC stack as specified
in EN 15509, and Annexes C, D and E give the use of the Italian DSRC as specified in ETSI/ES 200 674-1,
ISO CALM IR, and ARIB DSRC.
This International Standard contains a protocol implementation conformance statement (PICS)
proforma in Annex B and informative transaction examples in Annex F. The informative Annex G
highlights how to use this International Standard for the European electronic toll service (as defined in
Commission Decision 2009/750/EC).
Test specifications are not within the scope of this International Standard.
ISO 13141:2015(E)
RSE OBE
AP AP
On-board LAC
Road-side LAC
application
application
RSE LAC OBE LAC
function calls function calls
Scope of this ADU
DSRC functions DSRC functions
International
for LAC for LAC
Standard
Communication Communication
service primitives
service primitives
DSRC communication services
Figure 1 — The LAC application interface
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO/IEC 8824-1:2008, Information technology — Abstract Syntax Notation One (ASN.1): Specification of
basic notation — Part 1
ISO/IEC 8825-2:2008, Information technology — ASN.1 encoding rules: Specification of Packed Encoding
Rules (PER) — Part 2
ISO/IEC 9797-1:2011, Information technology — Security techniques — Message Authentication Codes
(MACs) — Part 1: Mechanisms using a block cipher
ISO 12813, Electronic fee collection — Compliance check communication for autonomous systems
ISO 14906:2011/Amd1:2015, Electronic fee collection — Application interface definition for dedicated
short-range communication
2 © ISO 2015 – All rights reserved

ISO 13141:2015(E)
ISO 15628:2013, Intelligent transport systems — Dedicated short range communication (DSRC) — DSRC
application layer
1)
ISO 17575-1:2015, Electronic fee collection — Application interface definition for autonomous systems —
Part 1: Charging
ISO/IEC 18033-3:2010, Information technology — Security techniques — Encryption algorithms — Part 3:
Block ciphers
EN 12834:2003, Road transport and traffic telematics — Dedicated Short Range Communication (DSRC)
— DSRC application layer
EN 15509:2014, Electronic fee collection — Interoperability application profile for DSRC
NIMA Technical Report TR8350.2 version 3, Department of Defense World Geodetic System 1984, Its
Definition and Relationships With Local Geodetic Systems
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
access credentials
trusted attestation or secure module that establishes the claimed identity of an object or application
[SOURCE: EN 15509:2014, 3.1]
3.2
attribute
addressable package of data consisting of a single data element or structured sequences of data elements
3.3
authentication
security mechanism allowing verification of the provided identity
[SOURCE: EN 301 175]
3.4
authenticator
data, possibly encrypted, that is used for authentication
[SOURCE: ISO/TS 19299:2015, 3.5]
3.5
charge object
geographic or road related object for the use of which a charge is applied
3.6
data integrity
property that data has not been altered or destroyed in an unauthorized manner
[SOURCE: ISO/TS 19299:2015, 3.28]
3.7
on-board equipment
OBE
Note 1 to entry: all required equipment on-board a vehicle for performing required EFC functions and
communication services
1) To be published.
ISO 13141:2015(E)
3.8
roadside equipment
RSE
equipment located along the road, either fixed or mobile
3.9
service primitive
elementary communication service provided by the application layer protocol to the application processes
[SOURCE: ISO 14906:2011, 3.18 modified]
3.10
toll context
logical view as defined by attributes and functions of the basic elements of a toll scheme consisting of
a single basic tolling principle, a spatial distribution of the charge objects and a single behaviour of the
related Front End
3.11
transaction
whole of the exchange of information between two physically separated communication facilities
4 Abbreviated terms
For the purposes of this document, the following abbreviated terms apply.
ADU Application data unit (ISO 14906)
AID Application identifier (ISO 15628 and EN 12834)
ASN.1 Abstract syntax notation one (ISO/IEC 8824-1)
BST Beacon service table (ISO 14906)
CCC Compliance check communication (ISO 12813)
DSRC Dedicated short-range communication (ISO 14906)
EID Element identifier (ISO 15628 and EN 12834)
EFC Electronic fee collection
IR Infrared
IUT Implementation under test
LAC Localisation augmentation communication
MAC Media Access control (EN 12795) or Message authentication code (ISO 14906)
OBE On-board equipment (ISO 14906)
PICS Protocol implementation conformance statement
RSE Roadside equipment (ISO 14906)
VST Vehicle service table (ISO 14906)
WGS84 World Geodetic System 1984
4 © ISO 2015 – All rights reserved

ISO 13141:2015(E)
5 Application interface architecture
5.1 General
This clause gives an insight into the LAC architecture by identifying the functions, the use of DSRC
communication primitives, and the attributes addressed. A detailed description of the functions is
given in Clause 6, while details of the attributes are in Clause 7.
The LAC application interface has been designed to make use of the CEN DSRC communication stack, via
the application layer as specified in ISO 15628 and EN 12834. For other identified DSRC communication
media, detailed mappings to corresponding services are given in Annexes C, D and E.
5.2 Services provided
The LAC application interface offers the following services to LAC applications:
— writing of data in order for the RSE to communicate location data to the OBE;
— authentication of the RSE by the OBE by means of access credentials.
There is no read service provided within the LAC communication. The RSE transmits data to the OBE
using the underlying acknowledged communication services, in order to verify that the data indeed are
properly transmitted over the DSRC interface.
The above services are realized by means of protocol exchanges performed by means of communication
services and transactions as described in Clause 8.
The services are provided by the following functions:
— the “Initialise communication” function, which shall be used to establish the LAC communication
link between the RSE and OBE;
— the “Write data” function, which shall be used to send LAC attributes to the OBE;
— the “Terminate communication” function, which shall be used to terminate the LAC communication.
5.3 Attributes
There is a single attribute defined for localization augmentation. This attribute contains a set of data
in order for the OBE to be able to determine its localization with better accuracy and availability or to
directly receive a charge object identification related to the local toll context. This set of data contains:
— geographic coordinates (latitude, longitude and altitude);
— charge object reference.
When the RSE writes this attribute to the OBE, it shall transmit geographic coordinates or charge object
reference or both.
5.4 Contract and toll context
Regarding LAC, the OBE shall identify itself in the initialisation phase with a single LAC Context Mark in
the VST. This Context Mark identifies the user contract in terms of the service provider, type of contract
and version information. This information enables the RSE to decide whether the OBE carries a contract
which it supports, and if so, to choose the corresponding security elements.
ISO 13141:2015(E)
An RSE can provide the OBE with localization augmentation for several overlapping contexts
simultaneously by writing the LAC attribute (which includes the applicable toll context) several times
in one transaction.
NOTE The LAC operates in a broadcast fashion, where the RSE has only minimal information about the OBE
and is not able to assess the liability of a vehicle for tolls. For this reason, the OBE can receive LAC information
which is not applicable.
5.5 Use of lower layers
5.5.1 Supported DSRC communication stacks
The LAC application interface makes use of the CEN DSRC communication stack as described in Table 1.
Other communication media can be used as listed in Table 1 if an equivalent mapping to corresponding
services is provided. Detailed examples are provided in Annexes C, D and E.
Table 1 — Supported short-range communication stacks
Medium Application layer Lower layers Detailed specifications
CEN-DSRC ISO 15628 EN 12795 and
Specification in 5.5.2
and EN 12834 EN 12253
Italian DSRC ES 200 674–1 ES 200 674–1
(Clause 11 and (Clauses 7 to 10 and Implementation example in Annex C
Annex D) Annex D)
ISO CALM IR ISO 15628 ISO 21214 Implementation example in Annex D
and EN 12834
ARIB DSRC ARIB STD-T75 ARIB STD-T75 ITU-R. Implementation example in Annex E
and ISO 15628 M1453–2
NOTE EN 12795 and EN 12253 have been adopted in ITU-R.M 1453–2.
If more than one communication medium is implemented in an OBE, the OBE shall respond to RSE
interrogations on the same medium as the RSE has used.
5.5.2 The use of the CEN DSRC stack
The LAC application shall be used with the CEN DSRC communication stack in the following ways:
— the OBE shall comply with EN 15509:2014, 6.1.2;
— the RSE shall comply with EN 15509:2014, 6.2.2.
NOTE Compliance with EN 15509 implies compliance of the DSRC stack with ISO 15628 and EN 12834
regarding the application layer, and EN 12795 and EN 12253 for the lower layers.
6 Conformance requirements
6.1 General
In the view of the OBE, the LAC communication is a read only data exchange. There is neither an
interrogation of OBE capabilities nor feedback from the OBE regarding the received data or commands.
From that this follows that the OBE shall support all standardized LAC RSE transaction sequences.
The RSE shall only broadcast, within the context of LAC transactions, attributes defined in this
International Standard.
6 © ISO 2015 – All rights reserved

ISO 13141:2015(E)
6.2 Functional requirements
6.2.1 Minimum supported transaction details
All functions defined in this clause shall be available on the OBE side.
For CEN-DSRC, the functions shall be provided by the DSRC application layer as specified in ISO 15628
and EN 12834 (services INITIALISATION, SET and RELEASE).
Only the functions for CEN DSRC are defined in 6.2.2 to 6.2.4. For other supported media according to
5.5.1, equivalent functionality shall be provided; see Annex C for ETSI/ES 200 674-1 5.8 GHz microwave
DSRC, Annex D for CALM infrared DSRC and Annex E for ARIB microwave DSRC.
6.2.2 Initialising communication
Initialisation of the communication between the RSE and the OBE shall be initiated by the RSE, by
means of the invocation of an initialisation request by the RSE. After successful initialisation, the
function “Initialise communication” shall notify the applications on the RSE and OBE sides.
The initialisation notification on the OBE side shall carry at least the identity of the beacon (e.g. the
beacon serial number) and absolute time. The initialisation notification on the RSE side shall carry the
LAC application identity and also the data required for the security services (e.g. random number and
key identifier).
The function “Initialise communication” shall be provided by the application layer INITIALISATION
services, as specified in ISO 15628 and EN 12834. It is defined in Annex A (see LAC-InitialiseComm-
Request and LAC-InitialiseComm-Response).
6.2.3 Writing of data
The function “Write data” shall be provided by the application layer SET service as specified in ISO 15628
and EN 12834, and is defined in Annex A (see LAC-DataTx-Request and LAC-DataTx-Response).
NOTE 1 The “mode” parameter in the LAC-DataTx-Request indicates whether or not the corresponding
response is expected. If mode = false, the response primitive is not used and the reception is only acknowledged
by the OBE on lower layers.
In the SET service primitives, iid shall not be used.
NOTE 2 The invocation of a service primitive by an application process implicitly calls upon and uses services
offered by the lower protocol layers.
The SET shall always carry access credentials.
6.2.4 Termination of communication
The RSE may terminate the communication on application level with the OBE with the function
“Terminate communication”, by means of the invocation of a release request by the RSE.
NOTE A termination of the communication on link level is outside of the scope of this International Standard.
The function “Terminate communication” shall be provided by the application layer service EVENT-
REPORT, as specified in ISO 15628 and EN 12834, and is defined in Annex A (see LAC-TerminateComm).
ISO 13141:2015(E)
6.3 Security
6.3.1 General
Security is an essential part of LAC applications. This International Standard provides for both
communication-related security services and communication-transparent data elements, which may
provide security characteristics.
This International Standard for localization augmentation communication provides for a “Write
data” function and uses access credentials as a mandatory communication security provision. Access
credentials provide for protection against unauthorized writing of LAC data, and hence for authentication
of the LAC RSE and the LAC data to the OBE. The detailed implementations of the communication
security services are media-specific (see 6.3.2 for CEN DSRC and the annexes for other media).
NOTE 1 Authentication of the OBE to the RSE according to EN 15509 is not supported, as the identity of the
OBE and contract are not relevant for the LAC application.
This International Standard provides for data elements, which may provide data origin authentication,
data integrity and non-repudiation characteristics to the LAC Data. The LAC application is transparent
to these authenticators, which may be stored together with the other LAC data elements as a data
packet, which is protected against forgery and/or protected against repudiation (between e.g. the user
and the LAC Operator).
NOTE 2 This International Standard does not provide for an encryption service. No privacy sensitive data are
transferred by LAC.
6.3.2 Authentication of RSE — Access credentials
Access credentials shall be used to manage access to the LAC attribute. Access credentials are
mandatory. The “Write data” function shall always carry access credentials.
The CEN DSRC OBE shall support the calculation of access credentials according to security level 1, as
defined in EN 15509:2014, 6.1.5.3.
The CEN DSRC RSE shall be able to calculate access credentials according to security level 1, as defined
in EN 15509:2014, 6.2.5.3.
Access credentials are defined as being of ASN.1 type OCTET STRING. This only pertains to the ASN.1
syntax; the semantics are media-dependent.
6.3.3 Authentication of LAC Data
The data elements mAC-TC and mAC2 (see 7.5) may contain authenticators, as well as key references
for the calculation of those authenticators, and are provided as a means to guarantee data origin
authentication, integrity and non-repudiation characteristics to the LAC data.
The two data elements are provided to allow for separate elements for authentication and non-
repudiation, if required. The LAC application is transparent to these authenticators, which implies that
it supports various system security concepts.
The data element mAC-TC is defined as being of type MAC_TC and mAC2 is defined as being of ASN.1
type OCTET STRING. The semantics of the data elements are media-independent.
7 Attributes
7.1 General
Within the LAC context, the attributes and data elements given in Table 2 shall be made available.
8 © ISO 2015 – All rights reserved

ISO 13141:2015(E)
Table 2 — Supported short-range communication stacks
a
AttributeID Attribute Data element Length in Oc- Remarks
b
tets
n.a. LAC-ContextMark contractProvider 3
typeOfContract 2
contextVersion 1
54 LACData lacOperator 3
rseId 2
latitude 4 in micro degrees
longitude 4 in micro degrees
altitude 2 resolution 0,25 m
tollCharger 6
chargeObject 6
distanceToObject 2
lacTime 4
macTc 8
mac2 8
87-127 ReservedForPrivateUse — —
a
The assignment of attribute IDs is aligned with ISO 14906 and ISO 12813. Attributes 87 to 127 are assigned for private
use. All other remaining IDs are reserved for future use.
b
Length information is informative. For the type OCTET STRING, the length determinant, as defined in ISO/IEC 8825-2,

is explicitly stated.
The attribute LAC-ContextMark shall be part of ApplicationContextMark as specified in Annex A.
NOTE LAC-ContextMark is not an addressable attribute. It is part of the VST and can neither be read nor
written by the RSE as part of the LAC application.
In the following clauses, LAC Attributes and data elements are specified in terms of
— the names of the data elements forming the LAC Attribute;
— the semantic definition of the data element; and
— informative remarks, including references to other standards.
The specification of the corresponding data types in ASN.1 is provided in Annex A.
7.2 Data regarding location reference
To translate longitude, latitude and altitude coordinates to the corresponding real position on earth
or vice-versa the geodetic datum shall be WGS84(G1150), according to NIMA TR8350.2 version 3, per
default unless another earth-centred earth-fixed polar coordinate geodetic datum is agreed mutually
by the TC and TSP.
Furthermore, by default it is allowed to use any earth-centred earth-fixed polar coordinate geodetic
datum, as long as the maximum datum displacement relative to the geodetic datum prescribed is
acceptable to the Toll Charger of the related toll domain.
The maximum tolerated datum displacement, also called datum shift, should not exceed 0,4 m.
NOTE 1 The recommended maximum tolerated displacement allows, for example, for using one of the
International Terrestrial Reference Frames (ITRF), the Russian PZ90.2 or one of the European Terrestrial
Reference Frames (ETRF) as geodetic datums alternative to the WGS84.
ISO 13141:2015(E)
The calculated datum displacement should be determined according to the definitions in ASME Y14.5 –
2009 “Dimensioning and Tolerancing”.
The data element latitude shall contain the latitudinal coordinate of the centre of the road surface
covered by the specific LAC implementation, value in microdegrees. Values > 0 = north, < 0 = south,
absolute value shall not exceed 90 degrees.
The data element longitude shall contain the longitudinal coordinate of the centre of the road surface
covered by the specific LAC implementation, value in microdegrees. Values > 0 = east, < 0 = west,
absolute value shall not exceed 180 degrees.
The data element altitude shall contain the altitude according to definition of the chosen geodetic model
of the centre of the road surface covered by the specific LAC implementation, where a unit is 0,25 m.
In case no geographic coordinates are provided, a coding of all zero shall be used (latitude, longitude
and altitude equal to zero).
NOTE 2 The location indicated by the coding for “no geographic coordinates provided” is not on land surface
and does not need to be supported.
The data element chargeObject shall identify the charge object for which LAC is operated, according
to the local definition of the Toll Charger owning the respective toll scheme. The data element contains
chargeObjectDesignation with the same syntax and semantics as in ChargeObjectId defined in
ISO 17575-1:2015, 7.6.9. The second data element regimeId is kept for backward compatibility and shall
not be used anymore, i.e. shall be zero.
NOTE 3 The data element tollContext (of type Provider) in tollCharger together with chargeObjectDesignation
from chargeObject are providing the information contained in ChargeObjectId as used and defined in ISO 17575-1.
In case no Toll Charger dependent information is provided, a coding of all zero shall be use
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