ETSI TS 103 695 V2.1.1 (2022-11)

TECHNICAL SPECIFICATION
Intelligent Transport Systems (ITS);
Access layer specification in the 5 GHz frequency band;
Multi-Channel Operation (MCO) for Cooperative ITS (C-ITS);
Release 2
2 ETSI TS 103 695 V2.1.1 (2022-11)

Reference
DTS/ITS-004204
Keywords
access control, architecture, ITS
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ETSI
3 ETSI TS 103 695 V2.1.1 (2022-11)
Contents
Intellectual Property Rights . 4
Foreword . 4
Modal verbs terminology . 4
Introduction . 4
1 Scope . 5
2 References . 5
2.1 Normative references . 5
2.2 Informative references . 5
3 Definition of terms, symbols and abbreviations . 6
3.1 Terms . 6
3.2 Symbols . 6
3.3 Abbreviations . 6
4 Background . 7
5 Access layer MCO operation . 7
5.1 Introduction . 7
5.2 Access layer data flow . 8
5.3 Access layer management flow . 9
6 MCO Access layer extension . 9
6.1 Introduction . 9
6.2 Access layer instance IDentifier (AliID) . 10
6.3 ALI groups . 11
6.4 MCO_ACC Interfaces . 11
6.4.1 Overview . 11
6.4.2 Input parameters from higher layers . 11
6.4.3 Output parameter to higher layers . 12
Annex A (normative): AliID reliability indicators . 13
A.1 ITS-G5 . 13
A.2 ITS-G5 with 11bd capabilities . 13
A.3 LTE-V2X . 13
A.4 NR-V2X . 14
Annex B (informative): Output and inputs formats . 15
B.1 Input parameters from higher layers . 15
B.2 Output parameter to higher layers . 15
Annex C (informative): Bibliography . 16
Annex D (informative): Change History . 17
History . 18

ETSI
4 ETSI TS 103 695 V2.1.1 (2022-11)
Intellectual Property Rights
Essential patents
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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.
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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.
Introduction
ETSI EN 302 663 [i.1] specifies the access layer for ITS-G5 for Release 1 and ETSI EN 303 613 [i.2] specifies the
access layer for LTE-V2X for Release 1.
The present document provides Release 2 C-ITS access layer updates and extensions specific to Multi-Channel
Operation (MCO).
Where possible the specifications are access layer agnostic.

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5 ETSI TS 103 695 V2.1.1 (2022-11)
1 Scope
The present document specifies Release 2 C-ITS access layer MCO extensions based on Release 1 backward
compatibility.
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.
Not applicable.
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 EN 302 663: "Intelligent Transport Systems (ITS); ITS-G5 Access layer specification for
Intelligent Transport Systems operating in the 5 GHz frequency band".
[i.2] ETSI EN 303 613: "Intelligent Transport Systems (ITS); LTE-V2X Access layer specification for
Intelligent Transport Systems operating in the 5 GHz frequency band".
[i.3] ETSI TS 103 697: "Intelligent Transport Systems (ITS); Architecture; Multi-Channel Operation
(MCO) for Cooperative ITS (C-ITS); Release 2".
[i.4] IEEE 802.11bd™: "IEEE Draft Standard for Information technology--Telecommunications and
information exchange between systems Local and metropolitan area networks--Specific
requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY)
Specifications Amendment 5: Enhancements for Next Generation V2X".
NOTE: Available at https://standards.ieee.org/ieee/802.11bd/7451/.
[i.5] IEEE 802.11™-2020: "IEEE Standard for Information technology-Telecommunications and
information exchange between systems Local and metropolitan area networks-Specific
requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY)
Specifications".
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6 ETSI TS 103 695 V2.1.1 (2022-11)
3 Definition of terms, symbols and abbreviations
3.1 Terms
For the purposes of the present document, the following terms apply:
access layer instance: fully parametrized (service channel, technology, TX power, …) transceiver entity in the access
layer
access layer instance ID: Unique Identifier for an access layer instance
access layer instance group: set of access layer instances using the same service channel and access layer technology
access layer instance Group ID: Unique Identifier for an access layer instance group
access layer technology: consistent set of protocols covering the physical layer and link layer functionalities of the
ISO/OSI model defined in an independent specification or set of specifications
AliID generation: process of extracting the AliID from a received frame
AliID processing: operation of receiving an AliID from higher layers and configuring the transceiver correspondingly
instance: fully parametrized entity
instantiation: process of parametrizing an entity
channel load ratio: channel load value per ALI group evaluated at the receiving C-ITS-S
cooperative-Intelligent Transport System: ITS system that realize applications bringing awareness of road user
behaviour by sharing static and dynamic information of its behaviour and recognized behaviour of others based on a
wireless communication system
ITS-G5 with 11bd capabilities: ITS-G5 based access layer supporting the functionality provided by the
IEEE 802.11bd [i.4] and IEEE 802.11p [i.5] access layer specification
entity: singular, identifiable, and separate object realizing a function or set of functions
function: self-contained module that accomplishes a specific task
Intelligent Transport Systems (ITS): systems which aim to provide innovative services relating to different modes of
transport and traffic management and enable users to be better informed and make safer, more coordinated, and
"smarter" use of transport networks
plane: in a networking context, logical grouping of functions over different layers
subchannel: technology dependent group of contiguous Physical Resource Blocks (PRBs) representing the minimum
granularity for the allocation of a packet in the frequency domain
3.2 Symbols
Void.
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
ALI Access Layer Instance
AliGroupID Access layer instance Group IDentifier
NOTE: The abbreviation AliGroupID is compliant with an ASN.1 representation of an identifier.
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7 ETSI TS 103 695 V2.1.1 (2022-11)
AliID Access layer instance IDentifier
NO
...