oSIST prEN 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

Straßenfahrzeuge - Kommunikationsschnittstelle zwischen Fahrzeug und Ladestation -

Teil 8: Anforderungen an physikalische und Datenverarbeitungsschnittstelle für die

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

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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

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

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

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

Any trade name used in this document is information given for the convenience of users and does not

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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/

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

This second edition cancels and replaces the first edition (ISO 15118-8:2018) of which it constitutes a

Any feedback or questions on this document should be directed to the user’s national standards body. A

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

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

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

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

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

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

ISO 15118-2:2014, Road vehicles — Vehicle-to-Grid Communication Interface — Part 2: Network and

ISO 15118-3:2015, Road vehicles — Vehicle to grid communication interface — Part 3: Physical and data

ISO 19363, Electrically propelled road vehicles — Magnetic field wireless power transfer — Safety and

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:

For the purposes of this document, the terms and definitions given in ISO 15118-1, ISO 15118-2 and the

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

wireless communication device that allows the user to connect to other wireless or wired

logical entity that is a singly addressable instance of a medium access control and physical layer

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

connection establishment indicated by a successful association/reassociation process as described in

restricted area around a charging station in which an SECC provides a connecting service with an

This document is based on the OSI service conventions (see ISO/IEC 10731) for the individual layers

Each individual requirement included in this document has a unique code, as follows:

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.

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

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.

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

These frequency bands are ISM and U-NII bands where both other wireless communication technologies

(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

— 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

— Charging control: for example, power request from vehicle to EVSE (typically 5 cm to 5 m range).

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

For testing and evaluating an installed system, a concept of service available area has been developed

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

[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

NOTE 1 An HT AP is an access point implementing the same set of features as an HT STA (see IEEE Std 802.11-

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

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

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.

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

[V2G8-006] If the SECC controls two or more power outlets at a time, the wireless

[V2G8-007] If the SECC controls only one power outlet at a time, the wireless communication

[V2G8-008] The wireless communication module of the SECC shall support a minimum of three

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-

Table 1 — Channels allowed to be used for ISO 15118 (all parts) in the 2,4 GHz band

Table 2 — Channels allowed to be used for ISO 15118 (all parts) in the 5 GHz band