ETSI TS 103 141 V2.1.1 (2021-11)

Intelligent Transport Systems (ITS); Facilities layer; Communication congestion control; Release 2

DTS/ITS-0010021

General Information

• Status: Not Published
• Technical Committee: ITS WG1 - Application Requirements and Services
• Current Stage: 12 - Completion
• Due Date: 19-Nov-2021
• Completion Date: 12-Nov-2021

Standards Content (Sample)

ETSI TS 103 141 V2.1.1 (2021-11)






TECHNICAL SPECIFICATION
Intelligent Transport Systems (ITS);
Facilities layer;
Communication congestion control;
Release 2

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2 ETSI TS 103 141 V2.1.1 (2021-11)

Reference
DTS/ITS-0010021
Keywords
application, ITS
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© ETSI 2021.
All rights reserved.

ETSI

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3 ETSI TS 103 141 V2.1.1 (2021-11)
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 Definitions, symbols and abbreviations . 6
3.1 Definitions . 6
3.2 Symbols . 6
3.3 Abbreviations . 7
4 Decentralized Congestion Control Architecture . 7
4.1 Overview . 7
5 DCC Facilities Entity (DCC_FAC) . 8
6 Interfaces for DCC_FAC. 9
6.1 Overview . 9
6.2 Interface with DCC_CROSS (MF-SAP) . 9
6.2.1 MF-GET.request . 9
6.2.1.1 Function . 9
6.2.1.2 Semantics . 9
6.2.2 MF-GET.confirm . 10
6.2.2.1 Function . 10
6.2.2.2 Semantics . 10
6.2.3 MF-SET.request . 10
6.2.3.1 Function . 10
6.2.3.2 Semantics . 10
6.2.4 MF-SET.confirm . 11
6.2.4.1 Function . 11
6.2.4.2 Semantics . 11
6.2.5 DCC Parameter at the MF-SAP . 11
Annex A (informative): Traffic class based DCC_FAC algorithm . 13
A.1 Overview . 13
A.2 Details of Traffic class based DCC_FAC algorithm . 14
A.3 Examples . 15
Annex B (informative): Transmission Demand and Deficit based DCC_FAC algorithm . 16
B.1 Overview . 16
B.2 Operation of Channel Resource Calculation . 16
B.3 Examples . 17
History . 18

ETSI

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4 ETSI TS 103 141 V2.1.1 (2021-11)
Intellectual Property Rights
Essential patents
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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
The aim of the Decentralized Congestion Control (DCC) is to adapt the transmit parameters of the ITS station operating
the ITS-G5 technology to the radio channel conditions, in order to maximize the probability of a successful reception at
intended receivers.
The DCC aims to provide channel resources among neighbouring ITS-S according to their needs. The Facilities Layer
DCC Entity determines priorities between different messages and informs DCC_CROSS about the available resources
to control the channel load generated by each application.
In case of a road traffic emergency the ITS-S may still transmit a burst of messages during a short period of time to
maintain a safe road traffic environment, even during a high network utilization period, where every ITS-S has very few
resources (e.g. CAM period at 1 Hz or 2 Hz). However, this exception occurs rarely and the messages transmitted for
this purpose are only those of uttermost importance.

ETSI

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5 ETSI TS 103 141 V2.1.1 (2021-11)
1 Scope
The present document specifies the Facilities Layer DCC Entity of the DCC mechanism for ITS-S using the ITS-G5
technology, taking into account the available channel resources of the ITS-S from the cross-layer DCC entity and the
message generation requirements from applications and services. The functional behaviour and the interfaces of the
Facilities Layer DCC Entity to the DCC_CROSS component are specified as well. The present document does not
address Multi-Channel Operation.
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 TS 102 636-4-2: "Intelligent Transport Systems (ITS); Vehicular Communications;
GeoNetworking; Part 4: Geographical addressing and forwarding for point-to-point and point-to-
multipoint communications; Sub-part 2: Media-dependent functionalities for ITS-G5".
[2] ETSI TS 103 175: "Intelligent Transport Systems (ITS); Cross Layer DCC Management Entity for
operation in the ITS G5A and ITS G5B medium".
[3] ETSI TS 102 723-1: "Intelligent Transport Systems (ITS); OSI cross-layer topics; Part 1:
Architecture and addressing schemes".
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 302 665: "Intelligent Transport Systems (ITS); Communications; Architecture".
[i.2] ETSI TS 102 687: "Intelligent Transport Systems (ITS); Decentralized Congestion Control
Mechanisms for Intelligent Transport Systems operating in the 5 GHz range; Access layer part".
[i.3] 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.4] ETSI TR 103 562: "Intelligent Transport Systems (ITS); Vehicular Communications; Basic Set of
Applications; Analysis of the Collective Perception Service (CPS); Release 2".
ETSI

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6 ETSI TS 103 141 V2.1.1 (2021-11)
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purposes of the present document, the terms and definitions given in ETSI EN 302 665 [i.1], ETSI
TS 103 175 [2] and the following apply:
cross-layer DCC: cooperation mechanisms based on components distributed over several layers of the protocol stack
which jointly work together to fulfil the operational requirements of DCC
decentralized congestion control: set of mechanisms for ITS-S to maintain network stability, throughput efficiency
and fair resource allocation to ITS-S using ITS-G5 access technology
DCC_ACC: DCC component located at the access layer
DCC_CROSS: DCC cross-layer component located in the management plane
DCC_CROSS_Facilities: function in the DCC_CROSS entity that provides DCC control parameters to the facilities
layer and to the applications
DCC_FAC: DCC component located at the facilities layer
DCC_NET: DCC component located in the networking & transport layer
ITS application: component of ITS applications layer
ITS-G5: access technology to be used in frequency bands dedicated for European Intelligent Transport Systems (ITS)
as defined in ETSI EN 302 663 [i.3]
3.2 Symbols
For the purposes of the present document, the following symbols apply:
��� average resource deficit for ��
� �
��� maximum available channel resources for ��
� �
��� maximum available channel resources for application/service j and ��
�� �
��� available percentage of channel resources defined in ETSI TS 103 175 [2]
�
��� estimated channel resource for application/service j and ��
�� �
�� available percentage of channel resources
�
�� total estimated channel resources from all applications/services in ��
� �
��� gross channel resource for ��
� �
� message length for application/service j and �� (in the unit of octets)
�� �
� average message length for application/service j and �� (in the unit of octets)
�� �
∗
� previously estimated average message length for application/service j and �� (in the unit of
�
��
octets)
��� net channel resource for ��
� �
��� proportional net channel resource for ��
� �
� data rate for application/service j and ��
�� �
�� traffic class with index i
�
� inter-message interval for application/service j and �� (in the unit of seconds)
��� �� �
� average inter-message interval for application/service j and �� (in the unit of seconds)
��� �� �
� proposed minimum inter-message interval for application/service j and �� (in the unit of seconds)
�������� �
ETSI

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7 ETSI TS 103 141 V2.1.1 (2021-11)
3.3 Abbreviations
For the purposes of the present document, the following abbreviations apply:
CA Cooperative Awareness
CAM Cooperative Awareness Messages
CPM Collective Perception Message
DCC Decentralized Congestion Control
DEN Decentralized Environmental Notification
DENM Decentralized Environmental Notification Message
ITS Intelligent Transport Systems
ITS-S ITS Station
MCM Maneuver Coordination Message
MCS Modulation and Coding Scheme
MF-SAP Management Facilities Service Access Point
OFDM Orthogonal Frequency Division Multiplexing
TC Traffic Class
4 Decentralized Congestion Control Architecture
4.1 Overview
ETSI EN 302 665 [i.1] provides the ITS reference architecture for an ITS-S and ETSI TS 103 175 [2] provides DCC
architecture for ITS-G5 systems as shown in Figure 1. The present document provides details of the DCC_FAC entity
residing in the facilities la
...