ISO 24102-4:2013

INTERNATIONAL ISO
STANDARD 24102-4
First edition
2013-07-01
Intelligent transport systems —
Communications access for land
mobiles (CALM) — ITS station
management —
Part 4:
Station-internal management
communications
Systèmes intelligents de transport — Accès aux communicat ions des
services mobiles terrestres (CALM) — Gestion des stations ITS —
Partie 4: Communications de gestion interne à la station
Reference number
ISO 24102-4:2013(E)
©
ISO 2013

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ISO 24102-4:2013(E)

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ISO 24102-4:2013(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 2
5 ITS station management . 2
6 Reference architecture . 3
7 Protocol data units . 3
8 Communication procedures . 5
8.1 Initialization . 5
8.2 Transmission . 5
8.3 Reception . 6
9 Management procedures . 7
9.1 General . 7
9.2 ITS-SCU-ID assignment . 7
9.3 Maintenance of ITS-SCU-ID . 8
9.4 Shutdown of ITS-SCU . 8
10 Security. 8
11 Conformance . 8
12 Test methods . 9
Annex A (normative) ASN.1 module .10
Annex B (normative) IIC PDUs .13
Bibliography .18
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ISO 24102-4:2013(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. 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. 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.
The committee responsible for this document is ISO/TC 204, Intelligent transport systems.
ISO 24102 consists of the following parts, under the general title Intelligent transport systems —
Communications access for land mobiles (CALM) — ITS station management:
— Part 1: Local management
— Part 3: Service access points
— Part 4: Station-internal management communications
— Part 5: Fast service advertisement protocol (FSAP)
The following parts are under preparation:
— Part 2: Remote management
— Part 6: Path and flow management
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ISO 24102-4:2013(E)

Introduction
This International Standard is part of a family of International Standards for communications access for
land mobiles (CALM). An introduction to the whole set of International Standards is provided in ISO 21217.
This part of ISO 24012 is part 4 of a multipart International Standard which determines the intelligent
transport systems (ITS) station management - station-internal management communications.
The ITS station management entity provides functionality related to the management of communication
protocol layers and the security entity presented in the ITS station reference architecture specified in
ISO 21217 and presented in Figure 1, and in line with the general ITS architecture specified in ISO 21217.
Applications
API
MS
Facilities
NF
Networking &
Transport
IN
Access
Communications
Figure 1 — ITS station reference architecture with named interfaces
ITS station management is specified as a distributed process, where no supervisory entity is employed.
© ISO 2013 – All rights reserved v
Management
MI MN MF
SI SN SF
Security

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INTERNATIONAL STANDARD ISO 24102-4:2013(E)
Intelligent transport systems — Communications access
for land mobiles (CALM) — ITS station management —
Part 4:
Station-internal management communications
1 Scope
This part of ISO 24102 provides specifications for secure ITS station-internal management
communications.
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 8825-2, Information technology — ASN.1 encoding rules: Specification of Packed Encoding Rules (PER)
ISO 21217, Intelligent transport systems — Communications access for land mobiles (CALM) — Architecture
ISO 21218, Intelligent transport systems — Communications access for land mobiles (CALM) — Access
technology support
ISO 24102-1, Intelligent transport systems — Communications access for land mobiles (CALM) — ITS station
management — Part 1: Local management
ISO 24102-3, Intelligent transport systems — Communications access for land mobiles (CALM) — ITS station
management — Part 3: Service access points
ETSI TS 102 797-1, Intelligent Transport Systems (ITS); Road Transport and Traffic Telematics (RTTT);
Test specifications for Intelligent Transport Systems, Communications access for land mobiles (CALM), ITS
station management (ISO 24102); Part 1: Protocol Implementation Conformance Statement (PICS) proforma
ETSI TS 102 797-2, Intelligent Transport Systems (ITS); Road Transport and Traffic Telematics (RTTT);
Test specifications for Intelligent Transport Systems, Communications access for land mobiles (CALM), ITS
station management (ISO 24102); Part 2: Test Suite Structure and Test Purposes (TSS & TP)
ETSI TS 102 797-3, Intelligent Transport Systems (ITS); Road Transport and Traffic Telematics (RTTT);
Test specifications for Intelligent Transport Systems, Communications access for land mobiles (CALM), ITS
station management (ISO 24102); Part 3: Abstract Test Suite (ATS) and partial PIXIT information
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 21217, ISO 21218, ISO 24102-1,
and ISO 24102-3 and the following apply.
3.1
ITS-S communication unit
addressable instance of the ITS station reference architecture comprising as an access to the ITS station-
internal network
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ISO 24102-4:2013(E)

4 Abbreviated terms
For the purposes of this document, the abbreviated terms given in ISO 21217, ISO 21218, ISO 24102-1,
and ISO 24102-3 and the following apply.
ITS-SCU ITS station communication unit
IIC ITS-S internal management communications
IICM IIC Manager
IICA IIC Agent
IICP ITS-S internal management communications protocol
n.a. not applicable
5 ITS station management
The ITS station management includes functionality specified in the various parts of this multipart
International Standard:
1) The functionality of local ITS station management specified in ISO 24102-1.
2) The functionality of remote ITS station management specified in ISO 24102-2.
3) The functionality of service access points specified in ISO 24102-3.
4) The functionality of ITS station-internal management communications specified in this part of ISO 24102.
5) The functionality of the “Fast Service Advertisement Protocol” (FSAP) specified in ISO 24102-5.
ITS station-internal management communications interconnects ITS station communication units (ITS-
SCUs) of the same ITS station (ITS-S) via the ITS station-internal network illustrated in ISO 21217. This
communication is also referred to as “ITS-S internal management communications” (IIC) in this part of
ISO 24102. IIC allows remote access to management SAPs specified in ISO 24102-3.
IIC may be secured following the principles of trusted distributed systems.
Detailed mandatory requirements are specified in the following clauses of this part of ISO 24102.
— Clause 6 specifies the IIC reference architecture.
— Clause 7 specifies IIC protocol data units (PDUs).
— Clause 8 specifies communication procedures.
— Clause 9 specifies management procedures.
— Clause 10 specifies security elements and procedures.
— Clause 11 specifies conformance declaration.
— Clause 12 specifies test methods.
— Annexes provide further mandatory requirements.
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ISO 24102-4:2013(E)

6 Reference architecture
“ITS-S Internal management Communications” (IIC) is communications between ITS-S Management
Entities of different ITS-SCUs of the same ITS via the ITS station-internal network. A specific purpose of
IIC is remote access to management service access points MI-SAP, MN-SAP, MF-SAP, and MS-SAP.
The reference architecture for IIC is illustrated in Figure 2.
API
Communications
ITS-S Security Entity ITS-S Management Entity ITS-S Facilities Layer
ITS station-Internal
management Communication
Agent (IICA)
NF-SAP
ITS-S Networking & Transport Layer
ITS-S Access Layer
ISO 21216 ISO 21215 ISO 21214 LAN CI
CI Selection
Other CIs
supporting supporting supporting ITS station-
Manager
MAC MAC MAC internal
groupcast groupcast groupcast network
frames frames frames access
Figure 2 — Reference architecture for ITS station-internal management communications
Source and destination of IIC protocol data units are instances of the “ITS station-Internal management
Communications Manager” (IICM). Transmission requests from the IICM are forwarded to the “ITS
station-Internal management Communications Agent” (IICA) via the MF-SAP. Notifications of received
IIC PDUs are sent by the IICA via the MF-SAP to the IICM.
Communications on the ITS station-internal network is performed between peer instances of the
IICA via NF-SAP, a suitable networking and transport layer protocol, the IN-SAP, and a suitable access
technology. Source and destination end points of the ITS-S networking and transport layer protocol are
identified by an ITS-S port (ITS-SP) with the number PORT_IIC of the IICA identified in [3].
NOTE Figure 2 shows the “Fast networking & transport layer protocol” (FNTP) specified in [3] as an example.
7 Protocol data units
“ITS-S Internal management Communications” (IIC) uses the following protocol data units (PDU)
illustrated in Figure 3:
— IIC-Request;
— IIC-Response.
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Security Support
MS-SAP
ITS station-Internal management
Communication Manager (IICM)
MF-SAP
MI-SAP MN-SAP

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ISO 24102-4:2013(E)

IIIC-Request:
SourceITS- Destination PDU-
PDU-ID Data SecRq
SCU-ID ITS-SCU-ID Counter
IIIC-Response:
SourceITS- Destination PDU- Error
PDU-ID Data SecRs
SCU-ID ITS-SCU-ID Counter Status
Figure 3 — IIC PDU structure
Details on parameters of these PDUs shall be as specified in Table 1.
Table 1 — IIC PDUs
PDU element IIC-Request IIC-Response
SourceITS-SCU-ID ITS-SCU-ID of source ITS-SCU, which ITS-SCU-ID of ITS-SCU, which pro-
produces the request. See parameter duces the response.
“ITS-scuId” specified in ISO 24102-1.
DestinationITS-SCU-ID ITS-SCU-ID of destination ITS-SCU, Same as SourceITS-SCU-ID of
which shall evaluate the request. related request if not requested
otherwise in this part of ISO 24102.
PDU-Counter Even number generated from a PDU-Counter of related request
cyclic counter at the ITS-SCU, which incremented by one.
produces the request.
PDU-ID Distinguishes IIC-Request and IIC- Distinguishes IIC-Request and IIC-
Response. Response.
Data Data type identifier followed by Data type identifier followed by
request data. response data.
ErrorStatus Not existent. Existent.
0: No error happened
>0: Number indicating type of error.
SeqRq Information authenticating the Not existent.
transmitting station.
SeqRs Not existent. Information authenticating the
transmitting station.
The ASN.1 specification of the PDUs as provided in Annex A of this part of ISO 24102 shall apply.
ITS-SCU-ID values used in parameters “SourceITS-SCU-ID” and “DestinationITS-SCU-ID” shall be as
specified in Table 2.
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ISO 24102-4:2013(E)

Table 2 — ITS-SCU-ID value assignment
SourceITS-SCU-ID DestinationITS- Description
SCU-ID
0 Reserved. Used to indicate “own/local ITS-SCU”. Must not be used in
communications with other ITS-SCUs.
n.a. 1 ITS-SCU-ID identifying ITS-SCUs with ITS-S host role.
n.a. 2 ITS-SCU-ID identifying ITS-SCUs with ITS-S router role.
n.a. 3 - 7 ITS-SCU-ID identifying ITS-SCUs with an implementation specific role
8 . 65534 ITS-SCU-ID identifying uniquely a specific ITS-SCU in an ITS station.
n.a. 65535 ITS-SCU-ID identifying all ITS-SCUs.
“PDU-ID” values and the related “Data” values shall be set as specified in Annex B of this part of ISO 24102.
“ErrorStatus” values shall be set as specified in Table 3.
Table 3 — ErrorStatus value assignment
ErrorStatus Description
0 No error
1 PDU-ID unknown or not implemented
2 Duplicate ITS-SCU-ID
3 Invalid or unknown AliveMessage
4 Invalid or unknown ITS-SCU type
5 . 254 Reserved for future use
255 Unspecified error
For transmission and reception of these PDUs, the networking and transport layer protocol shall use
port number PORT_IIC identified in [3].
8 Communication procedures
8.1 Initialization
8.1.1 IICM
ITS station-internal management communications between addressable ITS-SCUs shall be initialized as
specified in Clause 9 on management procedures.
8.1.2 IICA
Prior to the initialization specified in Clause 9, the IICA shall initialize communications via NF-SAP as
requested for the selected ITS-S networking and transport layer protocol. As a minimum, the ITS-SP
PORT_ICC identified in [3] shall be announced to the ITS-S networking and transport layer protocol.
8.2 Transmission
8.2.1 IIC-Request PDU
Upon request from a protocol in the ITS-S management entity, the IICM shall construct the IIC-Request
PDU specified in Clause 7. In case secure transmission is needed, the “Security Support” illustrated in
Figure 2 shall be involved via the MS-SAP. Details on security shall be as specified in Clause 10.
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ISO 24102-4:2013(E)

The “PDU-Counter” value shall be set to an even value uniquely in an ITS-SCU under the control of the
IICM issuing the request. The initial value shall be zero. For every next IIC-Request PDU, the counter
value shall be incremented by two. It shall wrap from 65 534 to zero. The IICM shall note the value of the
PDU-Counter in case a response is expected.
The IICM shall forward the IIC-Request PDU to the IICA using MF-COMMAND IICrequestTX specified
in Annex A.
The IICA shall request transmission of the IIC-Request PDU using the appropriate service of the NF-SAP.
8.2.2 IIC-Response PDU
Upon reception of an IIC-Request PDU which requires transmission of an IIC-Response PDU, the IICM
shall construct the IIC-Response PDU specified in Clause 7. In case secure transmission is needed, the
“Security support” illustrated in Figure 2 shall be involved via the MS-SAP. Details on
...