ISO 22738:2020
(Main)Intelligent transport systems — Localized communications — Optical camera communication
Intelligent transport systems — Localized communications — Optical camera communication
This document specifies OCC (Optical Camera Communication) as an access technology for localized communications applicable in ITS stations conforming with ISO 21217. OCC access technology is specified for the implementation context of ISO 21218. This document provides specifications of a communication interface (CI) named "ITS-OCC". This document specifies the additions to and deviations from IEEE 802.15.7:2018 which are required in order to make ITS-OCC CIs compatible with: — the ITS station and communication architecture specified in ISO 21217, and — the hybrid communications support specified in ISO 21218. This document specifies: — an OCC profile of IEEE 802.15.7:2018 for usage in C-ITS; — details of CAL (ISO 21218); and — details of MAE (ISO 21218, ISO 24102-3). NOTE Considering safety-related services involving communications between a vehicle and a roadside station being performed on the basis of OCC, it is noted that, due to shadowing, communications can be interrupted or blocked for a significantly long time.
Systèmes intelligents de transport — Communications localisées — Communication par caméra optique
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 22738
First edition
2020-07
Intelligent transport systems —
Localized communications — Optical
camera communication
Systèmes intelligents de transport — Communications localisées —
Communication par caméra optique
Reference number
©
ISO 2020
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved
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 IEEE 802.15.7 . 3
5.1 General requirements . 3
5.2 OCC PHY and MAC architecture . 3
5.3 PHY mode . 4
5.4 Modulation schemes . 4
5.5 MAC frame format . 5
5.6 Dimming . 5
5.7 Mitigation of flickering . 5
6 ITS station . 5
6.1 ITS station and communication architecture . 5
6.2 ITS-S service access points . 8
6.2.1 General. 8
6.2.2 Communications SAPs . 8
6.2.3 Management SAPs . 8
6.2.4 Security SAPs . 8
6.3 Hybrid communications support . 8
7 Communication interface protocol stack . 8
7.1 Communication interface parameters . 8
7.2 Physical layer . 8
7.3 Data link layer .10
7.3.1 General.10
7.3.2 Communication adaptation sub-layer .10
8 Communication interface management .10
8.1 General management.10
8.2 Management adaptation entity.10
8.2.1 OCC parameters and I-Parameters .10
8.2.2 OCC management commands and MI-SAP commands and requests .10
9 Procedures .11
9.1 Transmit procedure .11
9.2 Receive procedures .11
9.3 Management procedures .11
10 Conformance .11
11 Test methods .11
Annex A (normative) Communication interface parameters .12
Annex B (normative) MI-COMMANDs .16
Annex C (normative) MI-REQUESTs .17
Annex D (normative) ASN.1 definitions .18
Annex E (informative) Frequency band and frequency allocation .21
Annex F (informative) Dimming method .22
Bibliography .25
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 (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
constitute an endorsement.
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 2020 – All rights reserved
Introduction
Localized communications are an essential component of hybrid communications in Intelligent
Transport Systems (ITS). Various access technologies are suited for localized communications. An
increasing interest of ITS stakeholders for Cooperative ITS (C-ITS), Urban ITS (U-ITS), and Advanced
Driver Assistance Systems (ADAS) is on the access technology in OCC (Optical Camera Communication)
specified by IEEE.
OCC is capable of:
a) interoperating with cameras and LEDs devices, and
b) receiving messages from LED sources, and transmitting messages from back light and front light of
vehicles to other vehicles.
The purpose of OCC is broadcast dissemination of ITS information from:
— light sources (traffic light, street light, traffic sign), and
— vehicles
to other vehicles (one-to-many); see Figure 1.
Figure 1 — OCC based ITS Communication
OCC is considered for usage in:
1) roadside ITS station units (ITS-SUs), and
2) vehicle ITS-SUs.
OCC is intended to provide information to vehicles, see Figure 2.
Figure 2 — Vehicle-centric data flow in OCC
OCC uses LEDs as transmitters and cameras as receivers with visible light or near IR (NIR).
Characteristics of OCC are:
— visibility (visible light band);
— no regulation in optical frequency;
— harmlessness to human health (infrared and visible light band);
— non-interference with CIs based on radio waves; and
— licence-free operation.
See also Reference [6].
Figure 3 shows the basic operation of OCC. OCC supports ITS applications for vehicular scenarios such
[7], [8], [9]
as those already proposed by universities and companies .
Figure 3 — Basic OCC operation
vi © ISO 2020 – All rights reserved
INTERNATIONAL STANDARD ISO 22738:2020(E)
Intelligent transport systems — Localized communications
— Optical camera communication
1 Scope
This document specifies OCC (Optical Camera Communication) as an access technology for localized
communications applicable in ITS stations conforming with ISO 21217.
OCC access technology is specified for the implementation context of ISO 21218. This document provides
specifications of a communication interface (CI) named "ITS-OCC".
This document specifies the additions to and deviations from IEEE 802.15.7:2018 which are required in
order to make ITS-OCC CIs compatible with:
— the ITS station and communication architecture specified in ISO 21217, and
— the hybrid communicati
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.