ISO 15118-8:2018

INTERNATIONAL ISO
STANDARD 15118-8
First edition
2018-03
Road vehicles — Vehicle to grid
communication interface —
Part 8:
Physical layer and data link
layer requirements for wireless
communication
Véhicules routiers — Interface de communication entre véhicule et
réseau électrique —
Partie 8: Exigences relatives à la couche physique et à la couche
liaison de données pour la communication sans fil
Reference number
©
ISO 2018
© ISO 2018
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ii © ISO 2018 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 2
5 Conventions . 3
5.1 Definition of OSI based services . 3
5.2 Requirement structure . 3
6 System architecture . 3
7 Wireless communication requirements . 4
7.1 Overview . 4
7.2 SECC requirements . 5
7.2.1 General. 5
7.2.2 WLAN technology . 5
7.2.3 WLAN frequency and channel . 6
7.2.4 SECC channel scanning and selection . 8
7.2.5 Quality of service . 9
7.2.6 Association support .10
7.2.7 Layer 2 interfaces .14
7.2.8 Pairing .14
7.3 EVCC requirements .15
7.3.1 General.15
7.3.2 WLAN technology .15
7.3.3 WLAN frequency and channel .15
7.3.4 Quality of service .16
7.3.5 Association support .16
7.3.6 Layer 2 interfaces .18
7.4 Security .19
Annex A (informative) Mounting location of wireless communication module and antenna .20
Annex B (informative) Interference scan and auto channel selection example .24
Annex C (informative) Introduction of service available area .27
Annex D (informative) National regulations in usage of U-NII bands .29
Bibliography .34
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 on 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 the following
URL: www .iso .org/ iso/ foreword .html.
This document was prepared jointly by Technical Committee ISO/TC 22, Road vehicles, Subcommittee
SC 31, Data communication, and Technical Committee IEC/TC 69, Electric road vehicles and electric
industrial trucks. The draft was circulated for voting to the national bodies of both ISO and IEC.
A list of all parts in the ISO 15118 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved

Introduction
The pending energy crisis and necessity to reduce greenhouse gas emissions has led the vehicle
manufacturers to a very significant effort to reduce the energy consumption of their vehicles. They
are presently developing vehicles partly or completely propelled by electric energy. Those vehicles will
reduce the dependency on oil, improve the global energy efficiency and reduce the total CO emissions
for road transportation if the electricity is produced from renewable sources. To charge the batteries of
such vehicles, specific charging infrastructure is required.
Much of the standardization work on dimensional and electrical specifications of the charging
infrastructure and the vehicle interface is already treated in the relevant ISO or IEC groups. However,
the question of information transfer between the EV and the EVSE has not been treated sufficiently.
Such communication is necessary for the optimization of energy resources and energy production
systems so that vehicles can recharge in the most economic or most energy efficient way. It is also
required to develop efficient and convenient billing systems in order to cover the resulting micro-
payments. The necessary communication channel may serve in the future to contribute to the
stabilization of the electrical grid, as well as to support additional information services required to
operate electric vehicles efficiently and economically.
In ISO 15118-3, the messages exchanged between the vehicle and the infrastructure are transported
by the cable used for power transfer. With the inception of wireless power transfer technologies and
the tremendous development of wireless communication in our societies, the need for a wireless
communication between vehicle and charging infrastructure becomes imperative. This is the main
focus of this document. The relevant information on use-case definitions and network and application
1) 2)
protocol requirements can be found in ISO 15118-1 and ISO 15118-2 , respectively.
1) Under development. Stage at time of publication: ISO/DIS 15118-1:2018.
2) Under development. Stage at time of publication: ISO/CD 15118-2:2018.
INTERNATIONAL STANDARD ISO 15118-8:2018(E)
Road vehicles — Vehicle to grid communication
interface —
Part 8:
Physical layer and data link layer requirements for
wireless communication
1 Scope
This document specifies the requirements of the physical and data link layer of a wireless High Level
Communication (HLC) between Electric Vehicles (EV) and the Electric Vehicle Supply Equipment
(EVSE). The wireless communication technology is used as an alternative to the wired communication
technology as defined in ISO 15118-3.
It covers the overall information exchange between all actors involved in the electrical energy exchange.
ISO 15118 (all parts) are applicable for conductive charging as well as Wireless Power Transfer (WPT).
For conductive charging, only EVSEs compliant with “IEC 61851-1 modes 3 and 4” and supporting HLC
are covered by this document. For WPT, charging sites according to IEC 61980 (all parts) and vehicles
according to ISO/PAS 19363 are covered by this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 15118-1, Road vehicles — Vehicle to grid communication interface — Part 1: General information and
use-case definition
ISO 15118-2:2014, Road vehicles — Vehicle-to-Grid Communication Interface — Part 2: Network and
application protocol requirements
ISO 15118-3:2015, Road vehicles — Vehicle to grid communication interface — Part 3: Physical and data
link layer requirements
ISO/PAS 19363, Electrically propelled road vehicles — Magnetic field wireless power transfer — Safety and
interoperability requirements
IEEE Std 802.11™-2012, 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
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 15118-1, ISO 15118-2 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http:// www .electropedia .org/
— ISO Online
...