SIST EN ISO 15118-8:2020

SLOVENSKI STANDARD
oSIST prEN ISO 15118-8:2020
01-julij-2020
Cestna vozila - Komunikacijski vmesnik med vozilom in omrežjem - 8. del: Zahteve
za fizične in podatkovne povezovalne plasti za brezžično komunikacijo (ISO/FDIS
15118-8:2020)
Road vehicles - Vehicle to grid communication interface - Part 8: Physical layer and data
link layer requirements for wireless communication (ISO/FDIS 15118-8:2020)
Straßenfahrzeuge - Kommunikationsschnittstelle zwischen Fahrzeug und Ladestation -
Teil 8: Anforderungen an physikalische und Datenverarbeitungsschnittstelle für die
drahtlose Kommunikation (ISO/FDIS 15118-8:2020)
Véhicules routiers - Interface de communication entre véhicule et réseau électrique -
Partie 8: Exigences relatives à la couche physique et à la couche de liaison entre les
données pour la communication sans fil (ISO/FDIS 15118-8:2020)
Ta slovenski standard je istoveten z: prEN ISO 15118-8
ICS:
35.100.05 Večslojne uporabniške Multilayer applications
rešitve
43.040.15 Avtomobilska informatika. Car informatics. On board
Vgrajeni računalniški sistemi computer systems
oSIST prEN ISO 15118-8:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN ISO 15118-8:2020

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oSIST prEN ISO 15118-8:2020
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 15118-8
ISO/TC 22/SC 31
Road vehicles — Vehicle to grid
Secretariat: DIN
communication interface —
Voting begins on:
2020-05-27
Part 8:
Voting terminates on:
Physical layer and data link
2020-08-19
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 de
liaison entre les données pour la communication sans fil
This draft is submitted to a parallel vote in ISO and in IEC.
ISO/CEN PARALLEL PROCESSING
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 15118-8:2020(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2020

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oSIST prEN ISO 15118-8:2020
ISO/FDIS 15118-8:2020(E)

COPYRIGHT PROTECTED DOCUMENT
© 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
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Email: copyright@iso.org
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Published in Switzerland
ii © ISO 2020 – All rights reserved

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oSIST prEN ISO 15118-8:2020
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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 .13
7.2.8 Pairing .14
7.3 EVCC requirements .14
7.3.1 General.14
7.3.2 WLAN technology .14
7.3.3 WLAN frequency and channel .15
7.3.4 Quality of service .15
7.3.5 Association support .15
7.3.6 Layer 2 interfaces .17
7.4 Security .18
Annex A (informative) Mounting location of wireless communication module and antenna .19
Annex B (informative) Interference scan and auto channel selection example .23
Annex C (informative) Introduction of service available area .26
Annex D (informative) National regulations in usage of U-NII bands .28
Bibliography .33
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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 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 in collaboration with the European Committee for Standardization (CEN) Technical
Committee CEN/TC 301, Road vehicles, in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 15118-8:2018) of which it constitutes a
minor revision. The changes compared to the previous edition are as follows:
— Correction of requirement V2G8-034;
— Editorial corrections.
A list of all parts in the ISO 15118 series can be found on the ISO website.
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.
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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
2
for road transportation if the electricity is produced from renewable sources. To charge the batteries of
such vehicles, a 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
protocol requirements can be found in ISO 15118-1 and ISO 15118-2, respectively.
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oSIST prEN ISO 15118-8:2020
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 15118-8:2020(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 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 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:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
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3.1
access point
AP
wireless communication device that allows the user to connect to other wireless or wired
communication devices
Note 1 to entry: See IEEE Std 802.11-2012.
3.2
charging site
CS
area with one or more EVSEs controlled by one SECC
3.3
station
STA
logical entity that is a singly addressable instance of a medium access control and physical layer
interface to the wireless medium which does not act as an access point (3.1)
3.4
IEEE 802.11n
IEEE Std 802.11 where the instances are HT APs or HT STAs (3.3)
Note 1 to entry: The features of an HT STA are summarized in IEEE Std 802.11-2012, 4.3.10. An HT AP is an access
point (3.1) implementing the same set of features as an HT STA.
3.5
layer 2 link establishment
connection establishment indicated by a successful association/reassociation process as described in
IEEE Std 802.11-2012, 10.3.5.2 and 10.3.5.3
3.6
service available area
restricted area around a charging station in which an SECC provides a connecting service with an
ensured quality
4 Abbreviated terms
AP Access Point
AWC Automotive Wireless Communication
CS Charging Site
DFS Dynamic Frequency Selection
EDCA Enhanced Distributed Channel Access
EID Element Identifier
EMC Electromagnetic Compatibility
ETT Energy Transfer Type
EV Electric Vehicle
EVCC Electric Vehicle Communication Controller
EVSE Electric Vehicle Supply Equipment
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HLC High Level Communication
HLE Higher Layer Entities
HT High Throughput
ISM Industrial, Scientific and Medical
MAC Medium Access Control
SAP Service Access Point
SECC Supply Equipment Communication Controller
SSID Service Set Identifier
TPC Transmit Power Control
U-NII Unlicensed National Information Infrastructure
VSE Vendor Specific Element
WLAN Wireless Local Area Network
WPT Wireless Power Transfer
5 Conventions
5.1 Definition of OSI based services
This document is based on the OSI service conventions (see ISO/IEC 10731) for the individual layers
specified in this document.
5.2 Requirement structure
Each individual requirement included in this document has a unique code, as follows:
“[V2G8-XXX] Requirement text”
— where “V2G8” represents this document,
— where XXX represents the individual requirement number, and
— where “requirement text” includes the actual text of the requirement.
EXAMPLE [V2G8-999] This shall be an example requirement.
6 System architecture
This document is organized along architectural lines, same as in ISO 15118-3 emphasizing the large-scale
separation of the system into two parts: the MAC sub layer of the data link layer and the physical layer.
These layers are intended to correspond closely to the lowest layers of the ISO/IEC model for open systems
(see ISO/IEC 7498-1). Figure 1 shows the relationship of this document to the OSI reference model.
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Figure 1 — Overview of ISO 15118-1, ISO 15118-2, and this document in the
ISO/IEC OSI reference model
This document defines requirements applicable to layer 1 and 2, including the V2G standardized service
primitive interface for wireless communication, according to the OSI layered architecture. Layers 3 to 7
are specified in ISO 15118-2.
This document covers both conductive charging and WPT use-cases using wireless communication. If
not defined differently, requirements apply for both conductive charging and WPT.
7 Wireless communication requirements
7.1 Overview
This clause gives requirements for the wireless communication module on both the EVCC and the SECC
side. EVCC and SECC make use of wireless local area network (WLAN) as specified in IEEE Std 802.11-
2012 for wireless communication. More specifically, they implement the feature set of an HT STA or
HT AP (which were originally specified in IEEE 802.11n-2009 and are thus commonly referred to as
IEEE 802.11n), and operate in the 2,4 GHz and 5 GHz bands.
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These frequency bands are ISM and U-NII bands where both other wireless communication technologies
®1) ®2)
(e.g. Bluetooth , ZigBee , baby phone), and non-communication systems (e.g. microwave ovens,
radar systems) can cause interference with the WLAN communication channels. Therefore, the
requirements in this document are designed in a way where not only system interoperability is ensured,
but also the communication robustness is hardened. In addition, manufacturers and operators need to
make sure that the system is configured for robustness. For example, particular care has to be given to
selecting an appropriate operating channel to avoid the above-mentioned interference.
This document covers various use-cases in relationship to wireless communication for conductive
charging and WPT, considering different range requirements for the communication channel:
— Discovery: the EVCC has entered the communication range of the SECC(s), then associates to an
appropriate SECC to start HLC for further steps (typically 5 m to 30 m range);
— Fine positioning: alignment of the primary and secondary devices for efficient power transfer in
case of WPT and alignment of the connectors of EV and EVSE for power transfer in case of automatic
connection for conductive charging (typically 10 cm to 5 m range);
— Charging control: for example, power request from vehicle to EVSE (typically 5 cm to 5 m range).
Use-case details are given in ISO 15118-1.
The distance between EVCC and SECC for charging control depends on the installation location of
the wireless communication modules and antennae. This is out of scope of this document and vendor
specific. As the distance influences the reliability of the communication link, manufacturers are
encouraged to pay particular attention to the choice of mounting location. Additional parameters to be
considered and some example setups are given in Annex A.
For testing and evaluating an installed system, a concept of service available area has been developed
and detailed in Annex C.
7.2 SECC requirements
7.2.1 General
The wireless communication module of the SECC shall fulfil the requirements described in this
subclause to ensure interoperability between the SECC and EVCC with adequate communication
robustness for V2G applications.
7.2.2 WLAN technology
[V2G8-001] The wireless communication module of the SECC shall use IEEE 802.11
(see IEEE Std 802.11-2012) compliant wireless communication technology.
[V2G8-002] The wireless communication module of the SECC shall be configured as
access point (AP) according to IEEE 802.11.
[V2G8-003] The wireless communication module of the SECC shall support the mandatory
feature set of an HT AP according to IEEE Std 802.11-2012 on all the channels that
it supports.
NOTE 1 An HT AP is an access point implementing the same set of features as an HT STA (see IEEE Std 802.11-
2012, 4.3.10).
®
1)  Bluetooth is the trademark of a product supplied by Bluetooth Special Interest Group. This information is
given for the convenience of users of this document and does not constitute an endorsement by ISO of the product
named. Equivalent products may be used if they can be shown to lead to the same results.
®
2)  ZigBee is the trademark of a product supplied by Zigbee alliance. This information is given for the convenience
of users of this document and does not constitute an endorsement by ISO of the product named. Equivalent products
may be used if they can be shown to lead to the same results.
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The SECC may support other variants of IEEE 802.11 technology, as long as EVCCs can always establish
connections via IEEE 802.11n. An example of such a technology is the very high throughput PHY
(see IEEE 802.11ac-2013).
[V2G8-004] The beacon period of the SECC shall not exceed T_beacon = 105 ms.
NOTE 2 The beacon period is the time between two successive transmissions of the beacon frame. It is
measured in time units (1 TU = 1 024 µs). A typical value would be T_beacon = 100 TU.
NOTE 3 T_beacon is the value of the beacon interval field as described in IEEE Std 802.11-2012, 8.4.1.3.
7.2.3 WLAN frequency and channel
There are two frequency bands with up to 35 channels which the SECC and EVCC can use to communicate.
The SECC is responsible for choosing the channel for operation. SECCs supporting simultaneous dual
band operation is able to offer two operating channels for EVCCs to connect, while SECCs supporting
selectable dual band operation is only able to offer a single operating channel. The SECC for wireless
communication may be responsible for one or more power outlets as described in ISO 15118-1, which
is different from the SECC using powerline communication which controls only a single power outlet as
described in ISO 15118-3. Due to the possible drastic difference in the spectral environmental conditions
among the EVCCs in the case of SECCs controlling multiple power outlets, offering two operating
channels would let the EVCCs choose the channel which is less affected by its local interferences (e.g.
from in-car infotainment system) and thus increase the communication robustness. For SECCs installed
in an uncontrolled environment where the spectrum will not be monitored professionally, e.g. typically
envisioned for WPT systems, it is also advisable to offer simultaneous dual band support.
[V2G8-005] If the SECC supports WPT, the wireless communication module of the SECC shall
support operation at both the 2,4 GHz and 5 GHz frequency bands in parallel.
[V2G8-006] If the SECC controls two or more power outlets at a time, the wireless
communication module of the SECC shall support operation at both the 2,4 GHz
and 5 GHz frequency bands in parallel.
[V2G8-007] If the SECC controls only one power outlet at a time, the wireless communication
module of the SECC shall support operation at both the 2,4 GHz and 5 GHz
frequency bands, but not necessarily in parallel, unless [V2G8-005] applies.
[V2G8-008] The wireless communication module of the SECC shall support a minimum of three
channels per frequency band at the operating site among the channels listed in
Table 1 and Table 2.
NOTE 1 Depending on the location of the SECC, not all the channels listed in Table 1 and Table 2 can be allowed
to be used (see Figure 2). V2G8-027 and V2G8-008 refers to the common subset of these two groups.
NOTE 2 A collection of national regulations in usage of the U-NII band channels is listed in Annex D, Table D.1.
NOTE 3 Depending on local regulations, the implementation of DFS and/or TPC can be required. The DFS
mechanism is described in IEEE Std 802.11-2012, 10.9. The TPC mechanism is described in IEEE Std 802.11-
2012, 10.8.

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Table 1 — Channels allowed to be used for ISO 15118 (all parts) in the 2,4 GHz band
Channel ID Centre frequency (MHz)
1 2 412
2 2 417
3 2 422
4 2 427
5 2 432
6 2 437
7 2 442
8 2 447
9 2 452
10 2 457
11 2 462
Table 2 — Channels allowed to be used for ISO 15118 (all parts) in the 5 GHz band
Channel ID Centre frequency (MHz)
36 5 180
40 5 200
44 5 220
48 5 240
52 5 260
56 5 280
60 5 300
64 5 320
100 5 500
104 5 520
108 5 530
112 5 560
116 5 580
120 5 600
124 5 620
128 5 640
132 5 660
136 5 680
140 5 700
149 5 745
153 5 765
157 5 785
161 5 805
165 5 825

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Key
1 15118 channels
2 channels to be used by SECC and EVCC
3 channels allowe
...