ETSI TS 103 724 V2.1.1 (2021-08)

Intelligent Transport Systems (ITS); Facilities layer function; Interference Management Zone Message (IMZM); Release 2

DTS/ITS-001947

General Information

• Status: Not Published
• Technical Committee: ITS WG1 - Application Requirements and Services
• Current Stage: 12 - Completion
• Due Date: 02-Aug-2021
• Completion Date: 13-Aug-2021

Standards Content (Sample)

ETSI TS 103 724 V2.1.1 (2021-08)






TECHNICAL SPECIFICATION
Intelligent Transport Systems (ITS);
Facilities layer function;
Interference Management Zone Message (IMZM);
Release 2

---------------------- Page: 1 ----------------------
2 ETSI TS 103 724 V2.1.1 (2021-08)

Reference
DTS/ITS-001947
Keywords
interoperability, ITS, safety, service, transport
ETSI
650 Route des Lucioles
F-06921 Sophia Antipolis Cedex - FRANCE

Tel.: [phone]  Fax: [phone]

Siret N° 348 623 562 00017 - APE 7112B
Association à but non lucratif enregistrée à la
Sous-Préfecture de Grasse (06) N° w061004871

Important notice
The present document can be downloaded from:
http://www.etsi.org/standards-search
The present document may be made available in electronic versions and/or in print. The content of any electronic and/or
print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any
existing or perceived difference in contents between such versions and/or in print, the prevailing version of an ETSI
deliverable is the one made publicly available in PDF format at www.etsi.org/deliver.
Users of the present document should be aware that the document may be subject to revision or change of status.
Information on the current status of this and other ETSI documents is available at
https://portal.etsi.org/TB/ETSIDeliverableStatus.aspx
If you find errors in the present document, please send your comment to one of the following services:
https://portal.etsi.org/People/CommiteeSupportStaff.aspx
Notice of disclaimer & limitation of liability
The information provided in the present deliverable is directed solely to professionals who have the appropriate degree of
experience to understand and interpret its content in accordance with generally accepted engineering or
other professional standard and applicable regulations.
No recommendation as to products and services or vendors is made or should be implied.
No representation or warranty is made that this deliverable is technically accurate or sufficient or conforms to any law
and/or governmental rule and/or regulation and further, no representation or warranty is made of merchantability or fitness
for any particular purpose or against infringement of intellectual property rights.
In no event shall ETSI be held liable for loss of profits or any other incidental or consequential damages.

Any software contained in this deliverable is provided "AS IS" with no warranties, express or implied, including but not
limited to, the warranties of merchantability, fitness for a particular purpose and non-infringement of intellectual property
rights and ETSI shall not be held liable in any event for any damages whatsoever (including, without limitation, damages
for loss of profits, business interruption, loss of information, or any other pecuniary loss) arising out of or related to the use
of or inability to use the software.
Copyright Notification
No part may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm except as authorized by written permission of ETSI.
The content of the PDF version shall not be modified without the written authorization of ETSI.
The copyright and the foregoing restriction extend to reproduction in all media.

© ETSI 2021.
All rights reserved.

ETSI

---------------------- Page: 2 ----------------------
3 ETSI TS 103 724 V2.1.1 (2021-08)
Contents
Intellectual Property Rights . 5
Foreword . 5
Modal verbs terminology . 5
1 Scope . 6
2 References . 6
2.1 Normative references . 6
2.2 Informative references . 7
3 Definition of terms, symbols and abbreviations . 8
3.1 Terms . 8
3.2 Symbols . 8
3.3 Abbreviations . 9
4 Introduction to Interference Management Zone (IMZ) basic service . 10
4.1 Background . 10
4.2 Services provided by IMZ basic service . 11
4.3 Sending IMZM . 11
4.4 Receiving IMZM . 11
5 IMZ basic service functional description . 12
5.1 IMZ basic service in the ITS architecture . 12
5.2 IMZ basic service functional architecture . 12
5.3 Interfaces of the IMZ basic service . 14
5.3.1 Interface to ITS applications . 14
5.3.2 Interface to data provisioning facilities . 14
5.3.3 Interface to the networking & transport layer . 14
5.3.4 Interfaces to the protocol stacks of the networking & transport layer . 15
5.3.4.1 Interface to the GeoNetworking/BTP stack . 15
5.3.4.2 Interface to the IPv6 stack and the combined IPv6/GeoNetworking stack . 16
5.3.5 Interface to the Management entity . 16
5.3.6 Interface to the Security entity . 16
6 IMZM dissemination . 17
6.1 IMZM dissemination concept. 17
6.1.1 IMZM dissemination requirements . 17
6.1.2 IMZ basic service activation and termination . 17
6.1.3 IMZM generation frequency management . 17
6.1.4 IMZM generation time requirement . 17
6.1.5 IMZM triggering conditions . 17
6.2 IMZM dissemination constraints . 17
6.2.1 Security constraints . 17
6.2.1.1 Introduction . 17
6.2.1.2 Authorization Ticket requirements and Service Specific Permissions (SSP) . 18
6.2.1.3 Message security requirements . 19
6.2.2 General priority constraints. 19
7 IMZM Format Specification . 19
7.1 General Structure of a IMZM PDU . 19
7.2 ITS PDU header . 20
7.3 Generation Delta Time . 20
7.4 Basic container . 20
7.5 IMZM container . 20
7.6 IMZM format and coding rules . 23
7.6.1 Common data dictionary . 23
7.6.2 IMZM data presentation . 23
Annex A (normative): ASN.1 specification of IMZM . 24
ETSI

---------------------- Page: 3 ----------------------
4 ETSI TS 103 724 V2.1.1 (2021-08)
Annex B (informative): Security analysis of IMZ use cases . 25
B.1 Introduction . 25
B.2 Use Case: Frequency band interference management in a dedicated geographical zone . 26
History . 28


ETSI

---------------------- Page: 4 ----------------------
5 ETSI TS 103 724 V2.1.1 (2021-08)
Intellectual Property Rights
Essential patents
IPRs essential or potentially essential to normative deliverables may have been declared to ETSI. The declarations
pertaining to these essential IPRs, if any, are publicly available for ETSI members and non-members, and can be
found in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to
ETSI in respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the
ETSI Web server (https://ipr.etsi.org/).
Pursuant to the ETSI Directives including the ETSI IPR Policy, no investigation regarding the essentiality of IPRs,
including IPR searches, has been carried out by ETSI. No guarantee can be given as to the existence of other IPRs not
referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become,
essential to the present document.
Trademarks
The present document may include trademarks and/or tradenames which are asserted and/or registered by their owners.
ETSI claims no ownership of these except for any which are indicated as being the property of ETSI, and conveys no
right to use or reproduce any trademark and/or tradename. Mention of those trademarks in the present document does
not constitute an endorsement by ETSI of products, services or organizations associated with those trademarks.
DECT™, PLUGTESTS™, UMTS™ and the ETSI logo are trademarks of ETSI registered for the benefit of its

Members. 3GPP™ and LTE™ are trademarks of ETSI registered for the benefit of its Members and of the 3GPP
Organizational Partners. oneM2M™ logo is a trademark of ETSI registered for the benefit of its Members and of the
®
oneM2M Partners. GSM and the GSM logo are trademarks registered and owned by the GSM Association.
Foreword
This Technical Specification (TS) has been produced by ETSI Technical Committee Intelligent Transport Systems
(ITS).
Modal verbs terminology
In the present document "shall", "shall not", "should", "should not", "may", "need not", "will", "will not", "can" and
"cannot" are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of
provisions).
"must" and "must not" are NOT allowed in ETSI deliverables except when used in direct citation.

ETSI

---------------------- Page: 5 ----------------------
6 ETSI TS 103 724 V2.1.1 (2021-08)
1 Scope
The present document defines the "Interference Management Zone Message" (IMZM) that is used to identify an
interference management area with the aim to optimize the spectrum sharing between road ITS and other
services/applications. The objective is to support the dynamic band sharing in co-channel and adjacent channel
scenarios between ITS stations and other services and applications.
The message structure will be based on the existing CAM ProtectedCommunicationZones structure.
2 References
2.1 Normative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
Referenced documents which are not found to be publicly available in the expected location might be found at
https://docbox.etsi.org/Reference.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are necessary for the application of the present document.
[1] ETSI EN 302 636-3: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 3: Network architecture".
[2] ETSI TS 102 894-2 (V1.3.1): "Intelligent Transport Systems (ITS); Users and applications
requirements; Part 2: Applications and facilities layer common data dictionary".
[3] Recommendation ITU-T X.691/ISO/IEC 8825-2 (1997-12): "Information technology - ASN.1
encoding rules: Specification of Packed Encoding Rules (PER)".
[4] ETSI TS 103 097 (V1.3.1): "Intelligent Transport Systems (ITS); Security; Security header and
certificate formats".
[5] ETSI EN 302 637-2: "Intelligent Transport Systems (ITS);Vehicular Communications; Basic Set
of Applications; Part 2: Specification of Cooperative Awareness Basic Service".
[6] ETSI TS 103 300-3: "Intelligent Transport Systems (ITS); Vulnerable Road Users (VRU)
awareness; Part 3: Specification of VRU awareness basic service; Release 2".
NOTE: This reference is to be replaced by reference to Common Data Dictionary for Release 2 when available.
[7] ETSI TS 102 965: "Intelligent Transport Systems (ITS); Application Object Identifier (ITS-AID);
Registration".
[8] ETSI TS 102 731: "Intelligent Transport Systems (ITS); Security; Security Services and
Architecture".
[9] ETSI EN 302 636-5-1: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 5: Transport Protocols; Sub-part 1: Basic Transport Protocol".
[10] IEEE 1609.2™: "IEEE Standard for Wireless Access in Vehicular Environments--Security
Services for Applications and Management Messages".
ETSI

---------------------- Page: 6 ----------------------
7 ETSI TS 103 724 V2.1.1 (2021-08)
2.2 Informative references
References are either specific (identified by date of publication and/or edition number or version number) or
non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the
referenced document (including any amendments) applies.
NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee
their long term validity.
The following referenced documents are not necessary for the application of the present document but they assist the
user with regard to a particular subject area.
[i.1] ETSI TR 103 580: "Urban Rail ITS and Road ITS applications in the 5,9 GHz band; Investigations
for the shared use of spectrum".
[i.2] ETSI TR 102 863: "Intelligent Transport Systems (ITS); Vehicular Communications; Basic Set of
Applications; Local Dynamic Map (LDM); Rationale for and guidance on standardization".
[i.3] ETSI EN 302 665: "Intelligent Transport Systems (ITS); Communications Architecture".
[i.4] ETSI EN 302 636-4-1: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 4: Geographical addressing and forwarding for point-to-point and point-to-
multipoint communications; Sub-part 1: Media-Independent Functionality".
[i.5] ETSI TS 102 894-1: "Intelligent Transport Systems (ITS); Users and applications requirements;
Part 1: Facility layer structure, functional requirements and specifications".
[i.6] ETSI TS 102 941: "Intelligent Transport Systems (ITS); Security; Trust and Privacy
Management".
[i.7] ETSI TS 101 539-1: "Intelligent Transport Systems (ITS); V2X Applications; Part 1: Road Hazard
Signalling (RHS) application requirements specification".
[i.8] ETSI TS 101 539-2: "Intelligent Transport Systems (ITS); V2X Applications; Part 2: Intersection
Collision Risk Warning (ICRW) application requirements specification".
[i.9] ETSI TS 101 539-3: "Intelligent Transport Systems (ITS); V2X Applications; Part 3: Longitudinal
Collision Risk Warning (LCRW) application requirements specification".
[i.10] ETSI TS 102 723-5: "Intelligent Transport Systems (ITS); OSI cross-layer topics; Part 5: Interface
between management entity and facilities layer".
[i.11] ETSI TS 102 723-11: "Intelligent Transport Systems (ITS); OSI cross-layer topics; Part 11:
Interface between networking and transport layer and facilities layer".
[i.12] ISO EN 17419: "Intelligent Transport Systems -- Cooperative Systems -- Classification and
management of ITS applications in a global context".
[i.13] ETSI EN 302 663 (V1.2.1): "Intelligent Transport Systems (ITS); ITS-G5 Access layer
specification for Intelligent Transport Systems operating in the 5 GHz frequency band".
[i.14] ETSI EN 303 613 (V1.1.1): "Intelligent Transport Systems (ITS); LTE-V2X Access layer
specification for Intelligent Transport Systems operating in the 5 GHz frequency band".
[i.15] ETSI EN 302 571: "Intelligent Transport Systems (ITS); Radiocommunications equipment
operating in the 5 855 MHz to 5 925 MHz frequency band; Harmonised Standard covering the
essential requirements of article 3.2 of Directive 2014/53/EU".
[i.16] ETSI TS 102 792: "Intelligent Transport Systems (ITS); Mitigation techniques to avoid
interference between European CEN Dedicated Short Range Communication (CEN DSRC)
equipment and Intelligent Transport Systems (ITS) operating in the 5 GHz frequency range".
[i.17] EC Implementation Decision EU 2020/1426: "Commission Decision on the harmonised use of
radio spectrum in the 5875-5935 MHz frequency band of safety-related applications of Intelligent
Transport Systems (ITS) and repealing Decision 2008/671/EC".
ETSI

---------------------- Page: 7 ----------------------
8 ETSI TS 103 724 V2.1.1 (2021-08)
[i.18] ECC DEC (08)01: ECC Decision "The harmonised use of the 5875-5935 MHz frequency band for
Intelligent Transport Systems (ITS)", approved 14 March 2008, Amended 6 March 2020.
[i.19] ECC Report 101: "Compatibility studies in the band 5855- 5925 MHz between Intelligent
Transport Systems (ITS) and other systems, Bern, February 2007".
[i.20] ISO/IEC 27001:2013: "Information technology -- Security techniques -- Information security
management systems -- Requirements".
[i.21] FIPS PUB 199: "Standards for Security Categorization of Federal Information and Information
Systems".
[i.22] SAE Surface Vehicle Standard J2945/5: "Service Specific Permissions and Security Guidelines for
Connected Vehicle Applications".
[i.23] ETSI TS 102 165-1: "CYBER; Methods and protocols; Part 1: Method and pro forma for Threat,
Vulnerability, Risk Analysis (TVRA)".
[i.24] CEN ISO/TS 19321: "Intelligent transport systems - Cooperative ITS - Dictionary of in-vehicle
information (IVI) data structures".
[i.25] ETSI TS 103 175: "Intelligent Transport Systems (ITS); Cross Layer DCC Management Entity for
operation in the ITS G5A and ITS G5B medium".
[i.26] SAE J2735 (11-2009): "Dedicated Short Range Communications (DSRC) Message Set
Dictionary".
[i.27] ETSI TS 103 301: "Intelligent Transport Systems (ITS); Vehicular Communications; Basic Set of
Applications; Facilities layer protocols and communication requirements for infrastructure
services; Release 2".
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the terms given in ETSI EN 302 665 [i.3], ETSI TR 102 863 [i.2],
SAE J2735 [i.26] and the following apply:
DMC Toff limit: idle time limit for Decentralized Mitigation Control, using a procedure similar to what is defined in
ETSI TS 103 175 [i.25] for DCC
Interference Management Zone (IMZ): geographical area where spectrum can be shared dynamically to enable
co-channel and adjacent channel scenarios between ITS stations and other services and applications
Interference Management Zone Message (IMZM): IMZ basic service PDU
Interference Management Zone Message (IMZM) data: partial or complete IMZM payload
ITS-G5: access technology to be used in frequency bands dedicated for European intelligent transport System (ITS)
NOTE: As defined in ETSI EN 302 663 [i.13].
LTE-V2X: access technology to be used in frequency bands dedicated for European intelligent transport System (ITS)
NOTE: As defined in ETSI EN 303 613 [i.14].
V2X: either vehicle to vehicle (V2V), or vehicle to infrastructure (V2I) and/or infrastructure to vehicle (I2V)
3.2 Symbols
Void.
ETSI

---------------------- Page: 8 ----------------------
9 ETSI TS 103 724 V2.1.1 (2021-08)
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
API Application Programming Interface
ASN.1 Abstract Syntax Notation 1
BTP Basic Transport Protocol
CA Cooperative Awareness
CAM Cooperative Awareness Message
C-ITS Cooperative ITS
DCC Decentralized Congestion Control
DE Data Element
DF Data Frame
DMC Decentralized Mitigation Control
FA-SAP Facilities/Applications Service Access Point
FL-SDU Facility-layer Service Data Unit
GN GeoNetworking
HMI Human Machine Interface
I2V Infrastructure-to-Vehicle
IMZ Interference Management Zone
IMZM Interference Management Zone Message
ISO International Organization for Standardization
ITS Intelligent Transport Systems
ITS-S ITS Station
LDM Local Dynamic Map
LTE Long Term Evolution
MF-SAP Management/Facilities Service Access Point
MIB Management Information Base
MSB Most Significant Bit
N&T Networking & Transport layer
NF-SAP Networking & Transport/Facilities Service Access Point
OSI Open System Interconnection
PCI Protocol Control Information
PDU Packet Data Unit
PER Packed Encoding Rules
POTI Position and Time management
SAE Society of Automotive Engineers
SAP Service Access Point
SF-SAP Security Facilities - Service Access Point
SHB Single-Hop Broadcasting
SSP Service Specific Permissions
UPER Unaligned Packed Encoding Rules
V2I Vehicle-to-Infrastructure
V2V Vehicle-to-Vehicle
V2X Vehicle-to-everything
ETSI

---------------------- Page: 9 ----------------------
10 ETSI TS 103 724 V2.1.1 (2021-08)
4 Introduction to Interference Management Zone (IMZ)
basic service
4.1 Background
Cooperative ITS systems operate in license exempt frequency bands (e.g. 5 855 MHz to 5 925 MHz ETSI
EN 302 571 [i.15], 63,72 GHz to 65,88 GHz) and have to share at least part of the spectrum with other co-primary
services (for example, Urban Rail systems in the band 5 915 MHz to 5 925 MHz (see ETSI TR 103 580 [i.1]),
5 875 MHz to 5 925 MHz with Fixed Satellite Services (FSS) uplink). The interference impact can be two-fold: from
ITS stations to co-primary services or from co-primary service to ITS-S. In the first case, a mitigation action can be
required from the ITS-S to protect the co-primary service from being harmed (see next paragraph in clause 4.1). In the
second case, the action may be expected from the ITS-S to protect itself or to inform the driver that the ITS-S is subject
to an interference zone. In the present document, both types of zones are called interference management zones.
In order to be able to identify geographically limited areas where sharing is required, this geographical information
needs to be communicated in a secure manner by a trusted entity using known certificates to the ITS stations intending
to operate in these shared bands. Depending on the regulatory status of the services and applications to share with,
actions can be taken by ITS stations to mitigate the impact of interference. These actions could be one or a combination
of the following:
• Duty Cycle restrictions.
• Power restrictions.
• Switch off or receive only operation.
• Increase transmitter idle time to reduce the channel load (e.g. through DCC Toff limit).
• Change of radio channel / radio band change, e.g. 5,9 GHz to 60 GHz.
• Awareness message to the user (human or machine) providing a clear information that in a given area there
might be an issue (no specific mitigation action is required from the ITS-S in this case).
Similar operations can be envisaged for the protection of adjacent band (e.g. CEN DSRC tolling applications in the
band 5 795 MHz to 5 815 MHz, see ETSI TS 102 792 [i.16]).
The Interference Management Zone service defined in the present document provides information about interference
management zones where band sharing and coexistence are required. This is done through an Interference Management
Zone Message (IMZM) which is in addition or substitutive to the CAM from infrastructure devices (see ETSI
TS 103 301 [i.27] than the focused information contained in an infrastructure CAM. The message can be transmitted by
existing Roadside Equipment (RSE) or by specific RSE managed by either the operator of the system to be protected or
by road operators. It could also be transmitted by Onboard Equipment (OBE) as long as it is authorized and in the
trusted domain. This may happen, for example, on a train that sends out IMZM when needed, or in an emergency
vehicle or portable device of enforcement personnel, which then gets the possibility to provide protection of emergency
messages when needed. In summary, the present document proposes a global description of the message that can be
used as a toolbox by the relevant organizations to customize the IMZM suited to the interference management and
sharing regulation they want to enforce. Accordingly, mitigation requirements specific to identified use cases are out of
scope of the present document.
A specific interference management zone is defined locally around a well-defined position and is only valid for a
limited time duration. Both depend on the type of interference management zone:
• Geographical extension: the interference management zone should only be taken into account as long as the
ITS-S is travelling within the defined zones.
• Time validity of an interference management zone message: the validity can be from a few seconds to
unlimited. For example, in the case of a warning to the user such as for interference in the vicinity of satellite
stations, the zone is quasi static and always present. But this is only a warning, so no mitigation measures are
necessary from the ITS-S, which is reflected in the specifications of the present document (see clause 7).
ETSI

---------------------- Page: 10 --
...