Intelligent transport systems — Communication profiles for secure connections between trusted devices

This document specifies a methodology to define ITS-S communication profiles (ITS-SCPs) based on standardized communication protocols to interconnect trusted devices. These profiles enable secure information exchange between such trusted devices, including secure low-latency information exchange, in different configurations. The present document also normatively specifies some ITS-SCPs based on the methodology, yet without the intent of covering all possible cases, in order to exemplify the methodology. Configurations of trusted devices for which this document defines ITS-SCPs include: a) ITS station communication units (ITS-SCU) of the same ITS station unit (ITS-SU), i.e. station-internal communications; b) an ITS-SU and an external entity such as a sensor and control network (SCN), or a service in the Internet; c) ITS-SUs. Other ITS-SCPs can be specified at a later stage. The specifications given in this document can also be applied to unsecured communications and can be applied to groupcast communications as well.

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Publication Date
01-Oct-2019
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9020 - International Standard under periodical review
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15-Oct-2022
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TECHNICAL ISO/TS
SPECIFICATION 21185
First edition
2019-10
Intelligent transport systems —
Communication profiles for secure
connections between trusted devices
Reference number
ISO/TS 21185:2019(E)
ISO 2019
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ISO/TS 21185:2019(E)
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ii © ISO 2019 – All rights reserved
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ISO/TS 21185:2019(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols and abbreviated terms ........................................................................................................................................................... 2

5 OID conventions .................................................................................................................................................................................................... 2

6 Architecture ............................................................................................................................................................................................................... 3

7 Communication profiles and protocol stacks — Overview ...................................................................................... 3

7.1 Definitions and methodology ..................................................................................................................................................... 3

7.2 Contexts ......................................................................................................................................................................................................... 4

7.2.1 ITS-SCPs related to communications between ITS-SCUs .............................................................. 4

7.2.2 ITS-SCPs related communications between ITS-SUs ........................................................................ 4

7.2.3 ITS-SCPs related to SCNs ........................................................................................................................................... 5

8 ITS communication protocols ................................................................................................................................................................. 5

8.1 ITS-CP identifiers .................................................................................................................................................................................. 5

8.2 Initially identified ITS-CPs ............................................................................................................................................................ 6

8.2.1 ITS-S access layer............................................................................................................................................................. 6

8.2.2 ITS-S networking & transport layer ................................................................................................................ 6

8.2.3 ITS-S facilities layer ....................................................................................................................................................... 7

8.2.4 ITS-S security entity ...................................................................................................................................................... 8

8.2.5 ITS-S management entity ......................................................................................................................................... 8

8.2.6 Combinations of ITS-S layers and entities ................................................................................................. 8

9 ITS-S communication protocol stacks ............................................................................................................................................ 9

9.1 ITS-SCPS identifiers ............................................................................................................................................................................ 9

9.2 Initially identified ITS-SCPSs ...................................................................................................................................................... 9

9.2.1 ITS-SCPS for "ITS station-internal management communications" .................................... 9

9.2.2 ITS_SCPS for "SCN-access" ....................................................................................................................................... 9

9.2.3 ITS-SCPS for "M5 service announcement" ..............................................................................................10

9.2.4 ITS-SCPS for "Secure sessions involving Internet" ..........................................................................10

9.2.5 ITS-SCPS for "Secure broadcast of messages with the ETSI ITS-G5 Release

1 stack" ..................................................................................................................................................................................11

10 ITS-S communication profiles ..............................................................................................................................................................11

10.1 ITS-SCP identifiers ............................................................................................................................................................................11

10.2 Initially identified ITS-SCPs ......................................................................................................................................................12

10.2.1 ITS station-internal management communications .......................................................................12

10.2.2 Access to an SCN for diagnostics purposes ............................................................................................12

10.2.3 Service announcement ............................................................................................................................................13

10.2.4 General secure sessions involving Internet and using LTE ......................................................13

10.2.5 Secure broadcast of ETSI road safety messages with the ITS-G5 Release 1 stack 13

Annex A (normative) ASN.1 module ...................................................................................................................................................................15

Bibliography .............................................................................................................................................................................................................................19

© ISO 2019 – All rights reserved iii
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ISO/TS 21185:2019(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

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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

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For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso

.org/iso/foreword .html.

This document was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2019 – All rights reserved
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ISO/TS 21185:2019(E)
Introduction

ITS Station Communication Profiles (ITS-SCP) used in communications between trusted devices enable

— interoperability between ITS-SUs,
— and portability of ITS applications (that provide the ITS services).

Examples of trusted devices, i.e. ITS-secured communication nodes, are ITS-station units (ITS-

SU) specified in ISO 21217:2014. Four implementation contexts of communication nodes in ITS

communications networks are identified in ISO 21217:2014, each comprised of ITS-station units (ITS-

SU) taking on a particular role: personal, vehicular, roadside, or central. Such ITS-SUs participate in a

wide variety of ITS services related to, e.g. sustainability, road safety and transportation efficiency.

[27]

NOTE 1 ISO 21217:2014 fully covers the functionality of EN 302 665 , which is a predecessor of

ISO 21217:2014.

NOTE 2 An ITS-SU can be composed of ITS-SCUs from different vendors where each ITS-SCU is linked to a

[16]

different ITS-SCU configuration and management centre specified in ISO 24102-2 and ISO 17419. Station-

[17]

internal management communications between ITS-SCUs of the same ITS-SU are specified in ISO 24102-4 .

European C-ITS regulation refers to the "ITS-SCU configuration and management centre" as "C-ITS station

operator" meaning the entity responsible for the operation of a C-ITS station. The C-ITS station operator may be

responsible for the operation of one single C-ITS station (fixed or mobile), or a C-ITS infrastructure composed of a

number of fixed C-ITS stations, or a number of mobile ITS-Stations.

Such ITS-SCPs are essential for many ITS applications and services including time-critical safety

[16]

applications, automated driving, remote management of ITS-SUs (ISO 24102-2 ), and roadside/

infrastructure related services.

Over the last decade, ITS services have arisen that require secure access to data from Sensor and Control

Networks (SCN), e.g. from In-Vehicle Networks (IVNs) and from Infrastructure/Roadside Networks

(IRNs), some of which require secure local access to time-critical information, see Figures 1 and 2.

NOTE 3 Figures 1 and 2 are functional illustrations not describing or specifying a specific implementation.

Figure 1 — Example of a roadside ITS-SU connected to a secure proprietary IRN
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ISO/TS 21185:2019(E)
Figure 2 — Example of a vehicle ITS-SU connected to a secure proprietary IVN

Related use cases of these ITS services have largely been derived from regulatory requirements and

urban operational needs, and they include:

— secure real-time access to time-critical vehicle-related data for safety of life and property

applications, e.g. collision avoidance, emergency electronic brake light and event determination;

— secure local access to detailed real-time data for efficiency applications (traffic management), e.g.

intersection interaction, congestion avoidance, dynamic priorities;

— local access to certified real-time data for sustainability applications, e.g. dynamic emission zones

(controlled zones as currently standardized in CEN TC 278 within the Project Team PT1705 funded

by the European Commission), intersection priorities based on emissions, interactive optimum

vehicle settings to minimize fuel consumption.

There are many use cases of ITS services currently identified where real-time exchange of time-critical

information between ITS-SUs in close proximity is essential, and the number will grow (see, e.g. the US

[30]

National ITS Reference Architecture ). It is critical that ultimately all ITS-SUs in a given area are able

to be engaged in these distributed services. This, in turn, requires vehicle ITS-SUs to have real-time

access to vehicle data, and roadside ITS-SUs to have real-time access to infrastructure data, and to be

capable of secure software updates.

Another use case involving connectivity between ITS-Ss involves access to ITS-secure SCNs by ITS-

SUs over the Internet, i.e. cloud connectivity. Functions and services described in this document and

accompanying standards for creating secure communication links can be used to implement such

connectivity. Examples include secure communications between a server in a cloud-based ITS-SU and

an ITS-SU in a vehicle using a cellular modem, and secure communications between server in an ITS-SU

in a traffic control center and a client in an ITS-SU in the roadside “furniture” which it controls using a

fibre optic and/or microwave link.
[9]
Data and message specifications related to SCNs are provided in ISO/TS 21184 .

Cyber security means related to "Secure Sessions between Trusted Devices" (SSTD) in general, and

[8]
particularly to SCNs, are specified in ISO/TS 21177 .

Cyber security means related to information dissemination (broadcast of messages) are specified in

[21]
IEEE Std. 1609.2™ .
vi © ISO 2019 – All rights reserved
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TECHNICAL SPECIFICATION ISO/TS 21185:2019(E)
Intelligent transport systems — Communication profiles
for secure connections between trusted devices
1 Scope

This document specifies a methodology to define ITS-S communication profiles (ITS-SCPs) based on

standardized communication protocols to interconnect trusted devices. These profiles enable secure

information exchange between such trusted devices, including secure low-latency information

exchange, in different configurations. The present document also normatively specifies some ITS-SCPs

based on the methodology, yet without the intent of covering all possible cases, in order to exemplify

the methodology.

Configurations of trusted devices for which this document defines ITS-SCPs include:

a) ITS station communication units (ITS-SCU) of the same ITS station unit (ITS-SU), i.e. station-

internal communications;

b) an ITS-SU and an external entity such as a sensor and control network (SCN), or a service in the

Internet;
c) ITS-SUs.
Other ITS-SCPs can be specified at a later stage.

The specifications given in this document can also be applied to unsecured communications and can be

applied to groupcast communications as well.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO/IEC 8825-1, Information technology — ASN.1 encoding rules: Specification of Basic Encoding Rules

(BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER) — Part 1

ISO 17419, Intelligent transport systems — Cooperative systems — Globally unique identification

ISO 17423:2018, Intelligent transport systems — Cooperative systems — Application requirements and

objectives

ISO 21217:2014, Intelligent transport systems — Communications access for land mobiles (CALM) —

Architecture
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
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ISO/TS 21185:2019(E)
3.1
ITS-S communication profile
parameterized ITS-S communication protocol stack
[SOURCE: ISO 17423:2018, 3.6]
3.2
ITS communication protocol
communication protocol applicable in ITS
3.3
ITS-S communication protocol stack

consistent set of ITS-S communication protocols enabling communications between an ITS-SCU and

other nodes which may be identified by a registered globally unique reference number

[SOURCE: ISO 17423:2018, 3.7]
4 Symbols and abbreviated terms
CSP communication service parameter
[SOURCE: ISO 17423:2018]
ITS-CP ITS communication protocol
ITS-SCP ITS station communication profile
[SOURCE: ISO 17423:2018]
ITS-SCPS ITS station communication protocol stack
[SOURCE: ISO 17423:2018]
ITS-SCU ITS station communication unit
[SOURCE: ISO 21217:2014]
ITS-SU ITS station unit
[SOURCE: ISO 21217:2014]
IRN infrastructure/roadside network
IVN in-vehicle network
SCN sensor and control network
SSTD secure session between trusted devices
OID object identifier
5 OID conventions
The following OIDs are specified and used in this document:
1) Identifying this document:
{ iso (1) standard (0) cptd21185 (21185) }
2) Identifying ASN.1 module specifications of this document:
{ iso (1) standard (0) cptd21185 (21185) asn1 (1) }
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ISO/TS 21185:2019(E)
3) Identifying an ITS communications protocol:
{ iso (1) standard (0) cptd21185 (21185) commProtocol (2) }
4) Identifying an ITS-S communication protocol stack (ITS-SCPS):
{ iso (1) standard (0) cptd21185 (21185) its-scps (3) }
5) Identifying an ITS-S communications profile (ITS-SCP):
{ iso (1) standard (0) cptd21185 (21185) its-scp (4) }
6 Architecture

This document considers the ITS station and communication architecture specified in ISO 21217:2014

and specifies globally unique identifiers of ITS-S communication profiles (ITS-SCPs) for e.g.

— interconnecting ITS-SCUs in an ITS-SU,
— interconnecting ITS-SUs, and for,
— interconnecting an ITS-SU with a SCN,
using OIDs identifying
— ITS communication protocols,
— ITS-S communication protocol stacks (ITS-SCPS),
— ITS-S communication profiles (ITS-SCP),

also specified in this document. The approach is based on the methodology for protocol parameters

CSP_Protocol and CSP_SpecificCommsProts specified in ISO 17423:2018 and illustrated in 7.1.

7 Communication profiles and protocol stacks — Overview
7.1 Definitions and methodology

An ITS-SCP is defined in ISO 17423:2018 as a "parameterized ITS-S communication protocol stack".

ISO 17423:2018 further specifies how ITS-S application processes can present their communication

needs by means of "Communication Service Parameters" (CSP) to the ITS-S management, and how the

ITS-S management selects applicable ITS-S communication profiles. This document uses the following

two CSPs for specifying ITS-SCPs:
a) CSP_Protocol:

Identification of a complete non-parameterized communication protocol stack by means of a

globally unique registered communication protocol stack identifier of ASN.1 type ProtocolReq::=I

TSprotocolStackID, with ITSprotocolStackID specified in ISO 17419; see Clause 8.2.6.

NOTE 1 ISO 17419 specifies ITSprotocolStackID as an INTEGER.
b) CSP_SpecificCommsProts:

Identification of selected non-parameterized communications protocol stack elements by means

of a sequence of protocol identifiers of ASN.1 type SpecCommProts::=SEQUENCE OF ITSprotID,

with ITSprotID specified in ISO 17419 as a sequence of a ITS-S protocol location of ASN.1 type

ItssProtocolLocation followed by an ITS protocol identifier of ASN.1 type ItsProtocolIdentifier;

see Table 1 and Clause 8.
NOTE 2 ISO 17419 specifies ItsProtocolIdentifier as an INTEGER.
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ISO/TS 21185:2019(E)
[14]
NOTE 3 ITSprotID is used in Service Announcement specified in ISO 22418 .
Table 1 — Named Integer values of ItsProtocolLocation as specified in ISO 17419
ItsProtocolLocation
ITS-S layer or entity (ISO 21217:2014)
Acronym Value
ITS-S access layer "acLayer" 1
ITS-S networking & transport layer "ntLayer" 2
ITS-S facilities layer "fcLayer" 4
ITS-S management entity "mgEntity" 8
ITS-S security entity "scEntity" 16
Other location "other" 32

For ITS protocols residing in more than one layer or entity, the acronym to be used in the context of this document is

"several" with a value given by the sum of the values of the respective layers and entities. Alternatively, the parts of such an

ITS protocol may be identified separately.

The methodology for specifying ITS-SCPs in this document is given by the following steps:

1) Identify ITS communication protocols (ITS-CPs) by means of an "Object Identifier" (OID)

reference to the standard or specification of the protocol based on the methodology for CSP_

SpecificCommsProts specified in ISO 17423:2018; see 8.1.

2) Identify ITS-SCPSs by means of an "Object Identifier" (OID) reference to a set of ITS-CPs based on

the methodology for CSP_Protocol specified in ISO 17423:2018; see 9.1.

3) Identify ITS-SCPs by means of an "Object Identifier" (OID) reference to an ITS-SCPS and

parameterization information, see 10.1.
7.2 Contexts
7.2.1 ITS-SCPs related to communications between ITS-SCUs

An example of an ITS-SCP for the links between ITS-SCUs of the same ITS-SU (see Figure 3) is presented

in 10.2.1.
Figure 3 — Interconnection of ITS-SCUs in an ITS-SU
7.2.2 ITS-SCPs related communications between ITS-SUs

An example of an ITS-SCP for the link between ITS-SUs (see Figure 4) is presented in 10.2.3.

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ISO/TS 21185:2019(E)
Figure 4 — Interconnection of ITS-SUs
7.2.3 ITS-SCPs related to SCNs

An example of an ITS-SCP for the link between ITS-SUs (ITS-SCUs) and the interface towards sensor

and control networks (see Figure 5)is presented in 10.2.2.
Figure 5 — Interface between ITS-SU and sensor and control network

While the "Interface" in Figure 5 has to be ITS trusted and secured, the SCN may be ITS trusted and

secured or not. This document only considers the communications link between the ITS-SU and the

[8]
ITS-secured "Interface". Details on security are specified in ISO/TS 21177 .
8 ITS communication protocols
8.1 ITS-CP identifiers

ITS-CPs are identified by an "ITS protocol identifier" of type OID (see 7.1)pointing to a standard or

specification. Sub-clauses 8.2, 8.2.2, 8.2.3, 8.2.4, and 8.2.5 specify the OID value of ITS-CPs in the ITS-S

access layer, ITS-S networking & transport layer, ITS-S facilities layer, ITS-S security entity, and ITS-S

management entity, respectively. These layers and entities are specified in ISO 21217:2014.

The "ITS-CP identifier" OID values specified in Tables 2, 3, 4, 5, and 6 identify communication protocol

stack elements for the purpose of this document. Combinations of such protocols, i.e. ITS communication

protocol stacks, are specified in Clause 9.

Requirement 1: The generation of an OID for identifying an ITS-CP shall follow the following structure:

— {iso (1) standard (0) cptd21185 (21185) commProtocol (2)

(itssProtocolLocation) itsProtocolIdentifier-'n' ('n')}
with
— and itssProtocolLocation as specified in Table 1;

— itsProtocolIdentifier-'n': 'n: equals ItsProtocolIdentifier with values assigned in this document.

© ISO 2019 – All rights reserved 5
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ISO/TS 21185:2019(E)
8.2 Initially identified ITS-CPs
8.2.1 ITS-S access layer

Table 2 presents ITS protocol identifiers of ITS-CPs residing in the ITS-S access layer.

NOTE 1 The ITS-S access layer covers the OSI layers one and two; see ISO 21217:2014.

Table 2 — Communication protocol stack elements — ITS-S access layer
Standard reference ITS communication Comment
protocol identifier
[7]

ISO 17515-1 {iso (1) standard (0) cptd21185 Networked communications, i.e. general access to

(21185) commProtocol (2) acLayer the Internet.
(1) itsProtocolIdentifier-1 (1)}
This standard reference is used in the general
meaning of "applying LTE cellular network technol-
ogy for accessing the Internet"
[11]

ISO 21214 {iso (1) standard (0) cptd21185 Localised communications using infrared light.

(21185) commProtocol (2) acLayer
(1) itsProtocolIdentifier-2 (2)}
[12]

ISO 21215 {iso (1) standard (0) cptd21185 Localised communications using microwaves. This

(21185) commProtocol (2) acLayer can be either ordinary WiFi mode or OCB mode in
(1) itsProtocolIdentifier-3 (3)} different frequency bands.
[13]

ISO 21218 {iso (1) standard (0) cptd21185 Hybrid communications support. This is an optional

(21185) commProtocol (2) acLayer station-internal support protocol. It may become

(1) itsProtocolIdentifier-4 (4)} mandatory for ITS station-internal communications.

[20]
IEEE Std. 802-3™ {iso (1) standard (0) cptd21185 Wired Ethernet communications.
(21185) commProtocol (2) acLayer
(1) itsProtocolIdentifier-5 (5)}
[2]

ISO 13400-3 {iso (1) standard (0) cptd21185 DoIP — Wired interface based on IEEE std. 802.3™

(21185) commProtocol (2) acLayer
(1) itsProtocolIdentifier-6 (6)}
[26]

ETSI EN 302 663 {iso (1) standard (0) cptd21185 Localised communications using microwaves at

(21185) commProtocol (2) acLayer 5,9 GHz in OCB mode with LPD.
(1) itsProtocolIdentifier-7 (7)}

NOTE 2 Further standard references can be identified and linked to an ITS protocol identifier at a later stage.

8.2.2 ITS-S networking & transport layer

Table 3 presents ITS protocol identifiers of ITS-CPs residing in the ITS-S networking & transport layer.

NOTE 1 The ITS-S networking & transport layer covers the OSI layers three and four; see ISO 21217:2014.

Table 3 — Communication protocol stack elements — ITS-S networking & transport layer

Standard reference ITS communication Comment
protocol identifier
[18]

ISO 29281-1 {iso (1) standard (0) cptd21185 Localised communications messaging protocol

(21185) commProtocol (2) ntLayer (FNTP) — partly interoperable with IEEE
(2) itsProtocolIdentifier-1 (1)} WSMP (IEEE Std. 1609.3™) .
[22]

IEEE Std. 1609-3™ {iso (1) standard (0) cptd21185 Localised communications messaging protocol

(21185) commProtocol (2) ntLayer (WSMP) — interoperable with ISO FNTP
(2) itsProtocolIdentifier-2 (2)} (ISO 29281-1) .

Interoperability is at least given for the information dissemination mode (broadcast communications), as

[22] [5] [18]

EEE Std. 1609-3™ only requires this mode out of the set of all modes identified in ISO/TS 16460 and ISO 29281-1 .

6 © ISO 2019 – All rights reserved
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ISO/TS 21185:2019(E)
Table 3 (continued)
Standard reference ITS communication Comment
protocol identifier
[10]
ISO 21210 {iso (1) standard (0) cptd21185 Networked communications using IPv6.
(21185) commProtocol (2) ntLayer
(2) itsProtocolIdentifier-3 (3)}
[28]

EN 302 636-4-1 {iso (1) standard (0) cptd21185 Localised communications messaging protocol

(21185) commProtocol (2) ntLayer (GeoNetworking).
(2) itsProtocolIdentifier-4 (4)}
[29]

EN 302 636-5-1 {iso (1) standard (0) cptd21185 GeoNetworking Basic Transport Protocol.

(21185) commProtocol (2) ntLayer
(2) itsProtocolIdentifier-5 (5)}

Interoperability is at least given for the information dissemination mode (broadcast communications), as

[22] [5] [18]

EEE Std. 1609-3™ only requires this mode out of the set of all modes identified in ISO/TS 16460 and ISO 29281-1 .

NOTE 2 Further standard references can be identified and linked to an ITS protoco

...

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