Road vehicles - Vehicle to grid communication interface - Part 20: 2nd generation network layer and application layer requirements (ISO 15118-20:2022)

This document specifies the communication between the electric vehicle (EV), including battery electric vehicle (BEV) and plug-in hybrid electric vehicle (PHEV), and the electric vehicle supply equipment (EVSE). The application layer messages defined in this document are designed to support the electricity power transfer between an EV and an EVSE.
This document defines the communication messages and sequence requirements for bidirectional power transfer.
This document furthermore defines requirements of wireless communication for both conductive charging and wireless charging as well as communication requirements for automatic connection device and information services about charging and control status.
The purpose of this document is to detail the communication between an electric vehicle communication controller (EVCC) and a supply equipment communication controller (SECC). Aspects are specified to detect a vehicle in a communication network and enable an Internet Protocol (IP) based communication between the EVCC and the SECC.

Straßenfahrzeuge - Kommunikationsschnittstelle zwischen Fahrzeug und Ladestation - Teil 20: 2. Generation Anforderungen an das Netzwerk- und Anwendungsprotokoll (ISO 15118-20:2022)

Véhicules routiers - Interface de communication entre véhicule et réseau électrique - Partie 20: Exigences des couches réseau et application de 2ème génération (ISO 15118-20:2022)

Cestna vozila - Komunikacijski vmesnik med vozilom in omrežjem - 20. del: Zahteve za omrežno in aplikacijsko plast druge generacije (ISO 15118-20:2022)

General Information

Status
Published
Public Enquiry End Date
19-Mar-2022
Publication Date
19-Jun-2022
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
25-May-2022
Due Date
30-Jul-2022
Completion Date
20-Jun-2022

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SLOVENSKI STANDARD
SIST EN ISO 15118-20:2022
01-julij-2022
Nadomešča:
SIST EN ISO 15118-2:2016
Cestna vozila - Komunikacijski vmesnik med vozilom in omrežjem - 20. del:
Zahteve za omrežno in aplikacijsko plast druge generacije (ISO 15118-20:2022)

Road vehicles - Vehicle to grid communication interface - Part 20: 2nd generation

network layer and application layer requirements (ISO 15118-20:2022)

Straßenfahrzeuge - Kommunikationsschnittstelle zwischen Fahrzeug und Ladestation -

Teil 20: 2. Generation Anforderungen an das Netzwerk- und Anwendungsprotokoll (ISO

15118-20:2022)

Véhicules routiers - Interface de communication entre véhicule et réseau électrique -

Partie 20: Exigences des couches réseau et application de 2ème génération (ISO 15118

-20:2022)
Ta slovenski standard je istoveten z: EN ISO 15118-20:2022
ICS:
35.100.05 Večslojne uporabniške Multilayer applications
rešitve
43.040.15 Avtomobilska informatika. Car informatics. On board
Vgrajeni računalniški sistemi computer systems
SIST EN ISO 15118-20:2022 en,fr,de

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

---------------------- Page: 1 ----------------------
SIST EN ISO 15118-20:2022
---------------------- Page: 2 ----------------------
SIST EN ISO 15118-20:2022
EN ISO 15118-20
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2022
EUROPÄISCHE NORM
ICS 43.120 Supersedes EN ISO 15118-2:2016
English Version
Road vehicles - Vehicle to grid communication interface -
Part 20: 2nd generation network layer and application
layer requirements (ISO 15118-20:2022)

Véhicules routiers - Interface de communication entre Straßenfahrzeuge - Kommunikationsschnittstelle

véhicule et réseau électrique - Partie 20: Exigences des zwischen Fahrzeug und Ladestation - Teil 20: 2.

couches réseau et application de 2ème génération (ISO Generation Anforderungen an das Netzwerk- und

15118-20:2022) Anwendungsprotokoll (ISO 15118-20:2022)
This European Standard was approved by CEN on 12 April 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 15118-20:2022 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 15118-20:2022
EN ISO 15118-20:2022 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 15118-20:2022
EN ISO 15118-20:2022 (E)
European foreword

This document (EN ISO 15118-20:2022) has been prepared by Technical Committee ISO/TC 22 "Road

vehicles" in collaboration with Technical Committee CEN/TC 301 “Road vehicles” the secretariat of

which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by November 2022, and conflicting national standards

shall be withdrawn at the latest by November 2022.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN ISO 15118-2:2016.

Any feedback and questions on this document should be directed to the users’ national standards

body/national committee. A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 15118-20:2022 has been approved by CEN as EN ISO 15118-20:2022 without any

modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 15118-20:2022
---------------------- Page: 6 ----------------------
SIST EN ISO 15118-20:2022
INTERNATIONAL ISO
STANDARD 15118-20
First edition
2022-04
Road vehicles — Vehicle to grid
communication interface —
Part 20:
2nd generation network layer and
application layer requirements
Véhicules routiers — Interface de communication entre véhicule et
réseau électrique —
Partie 20: Exigences des couches réseau et application de 2ème
génération
Reference number
ISO 15118-20:2022(E)
© ISO 2022
---------------------- Page: 7 ----------------------
SIST EN ISO 15118-20:2022
ISO 15118-20:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

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
© ISO 2022 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 15118-20:2022
ISO 15118-20:2022(E)
Contents Page

Foreword ................................................................................................................................................................. v

Introduction .......................................................................................................................................................... vi

1 Scope .......................................................................................................................................................... 1

2 Normative references .......................................................................................................................... 1

3 Terms and definitions .......................................................................................................................... 4

4 Abbreviated terms ............................................................................................................................. 12

5 Conventions .......................................................................................................................................... 15

5.1 Definition of OSI based services .................................................................................................... 15

5.2 Requirement structure ..................................................................................................................... 15

5.3 Usage of references ............................................................................................................................ 16

5.4 Notation used for XML schema diagrams................................................................................... 16

6 Document overview ........................................................................................................................... 16

7 Basic requirements for V2G communication............................................................................ 17

7.1 General information .......................................................................................................................... 17

7.2 Service primitive concept of OSI layered architecture ......................................................... 18

Overview ................................................................................................................................................ 18

Syntax of service primitives ............................................................................................................ 18

7.3 Security concept .................................................................................................................................. 19

General ................................................................................................................................................... 19

Certificate and key management .................................................................................................. 21

Number of root certificates and root validity ........................................................................... 35

Support and application of TLS ..................................................................................................... 37

Firewall .................................................................................................................................................. 38

Protection of the cryptographic keys .......................................................................................... 38

Random number generation .......................................................................................................... 40

7.4 V2G communication states and data link handling ................................................................ 42

7.5 Data link layer ...................................................................................................................................... 46

Data link layer security for WLAN ................................................................................................ 46

7.6 Network link layer ............................................................................................................................. 51

General ................................................................................................................................................... 51

Applicable RFCs, limitations and protocol parameter settings ......................................... 51

IP addressing ........................................................................................................................................ 53

7.7 Transport layer ................................................................................................................................... 54

Transmission control protocol (TCP) ......................................................................................... 54

User datagram protocol (UDP) ...................................................................................................... 55

Transport layer security (TLS) ...................................................................................................... 56

7.8 V2G transfer protocol ........................................................................................................................ 82

General information .......................................................................................................................... 82

Supported ports .................................................................................................................................. 83

Protocol data unit ............................................................................................................................... 84

7.9 Presentation layer .............................................................................................................................. 87

XML and efficient XML interchange (EXI) .................................................................................. 87

Message security ................................................................................................................................. 90

7.10 Application layer .............................................................................................................................. 115

SECC discovery protocol ................................................................................................................ 115

8 Application layer messages ......................................................................................................... 128

8.1 General information and definitions ........................................................................................ 128

8.2 Protocol handshake definition ................................................................................................... 129

© ISO 2022 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 15118-20:2022
ISO 15118-20:2022(E)

Handshake sequence ...................................................................................................................... 129

Message definition supportedAppProtocolReq and supportedAppProtocolRes ..... 131

Semantics description supportedAppProtocol messages ................................................. 132

Message examples ............................................................................................................................ 133

8.3 V2G message definition .................................................................................................................. 134

Overview ............................................................................................................................................. 134

General ................................................................................................................................................. 135

Header definition ............................................................................................................................. 135

Request and response definitions .............................................................................................. 138

Complex data types .......................................................................................................................... 240

8.4 Service selection ............................................................................................................................... 361

General ................................................................................................................................................. 361

General description of configuration parameters ............................................................... 362

Selection of service and service parameters .......................................................................... 363

8.5 V2G communication timing .......................................................................................................... 373

Overview ............................................................................................................................................. 373

Common ............................................................................................................................................... 373

DC service ............................................................................................................................................ 374

Message sequence and communication session ................................................................... 374

Session setup and ready to charge ............................................................................................. 381

V2G message synchronization for AC and DC with IEC 61851-1 signalling ................ 387

V2G message synchronization with IEC 61980-2 signalling for WPT ........................... 394

8.6 Message sequencing and error handling ................................................................................. 394

Overview ............................................................................................................................................. 394

Basic definitions for error handling .......................................................................................... 395

ResponseCode handling ................................................................................................................. 395

Request-response message sequence requirements .......................................................... 406

Multiplexed communication ........................................................................................................ 434

Message sequence diagrams ........................................................................................................ 437

(normative) Schema definition ............................................................................................... 442

(normative) Certificate profiles .............................................................................................. 444

(normative) Specification of identifiers ............................................................................... 498

(informative) ACDP ..................................................................................................................... 504

(informative) Basic PPD for interoperability .................................................................... 506

(informative) Message sequencing for renegotiation ..................................................... 509

(informative) Association of VAS client to V2G session ................................................. 511

(informative) Application of certificates ............................................................................ 512

(informative) Precision of measurements and tolerances ............................................ 547

(informative) Absolute pricing examples ............................................................................ 549

iv © ISO 2022 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 15118-20:2022
ISO 15118-20:2022(E)
Foreword

ISO (the International Organization for Standardization) and IEC (the International Electrotechnical

Commission) form the specialized system for worldwide standardization. National bodies that are

members of ISO or IEC participate in the development of International Standards through technical

committees established by the respective organization to deal with particular fields of technical activity.

ISO and IEC technical committees collaborate in fields of mutual interest. Other international

organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the

work.

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 document 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 or
www.iec.ch/members_experts/refdocs).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO and IEC 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) or the IEC list of patent

declarations received (see https://patents.iec.ch).

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. In the IEC, see www.iec.ch/understanding-standards.

This document was prepared jointly by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC

31, Data communication, Technical Committee IEC/TC 69, Electrical power/energy transfer systems for

electrically propelled road vehicles and industrial trucks, in collaboration with the European Committee

for Standardization (CEN) Technical Committee CEN/TC 301, Electrically propelled road vehicles, in

accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).

A list of all parts in the ISO 15118 series can be found on the ISO and IEC websites.

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 and www.iec.ch/national-

committees.
© ISO 2022 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 15118-20:2022
ISO 15118-20:2022(E)
Introduction

The pending energy crisis and necessity to reduce greenhouse gas emissions started in the former

century has led the vehicle manufacturers to a very significant effort to reduce the energy consumption

of their vehicles up to the present. As countermeasures to this continuous problem, they developed

vehicles partly or completely propelled by electric power and launched them into the market. 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

electricity to 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 for electric vehicles and the vehicle interface were treated in the relevant ISO or IEC groups.

However, the standardization work about direct information transfer between the electric vehicle and

the charging infrastructure was not enough, and it was assigned to the ISO 15118 series to treat the

subject sufficiently.

Such communication is necessary for the optimization of energy resources and energy production

systems. With it electric vehicles can be connected to the supply network and communicate the most

economic or most energy efficient way for charging/discharging. It is also required to develop efficient

and convenient billing systems in order to cover the resulting payments. The necessary communication

channel can serve in the future to contribute to the stabilization of the supply network as well as to

support additional information services required to operate electric vehicles efficiently and economically.

After the standardization work of the first basic smart charging was completed, more standardization

work for further evolved functions and high energy efficiency was continuously requested again.

It includes:

— improved charge methods that reduces efforts and agonies of the charging operation;

— extended functions for the electric vehicles to be utilized as distributed energy resources, which

enable smoothing of the electricity load of the supply network for higher energy efficiency and also

provide power back to the grid;
— information services for the user with higher added value and new convenience.

As for the communication system, the next evolution will be expected to realize these new applications.

vi © ISO 2022 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 15118-20:2022
INTERNATIONAL STANDARD ISO 15118-20:2022(E)
Road vehicles — Vehicle to grid communication
interface —
Part 20:
Network and application protocol requirements
1 Scope

This document specifies the communication between the electric vehicle (EV), including battery electric

vehicle (BEV) and plug-in hybrid electric vehicle (PHEV), and the electric vehicle supply equipment

(EVSE). The application layer messages defined in this document are designed to support the electricity

power transfer between an EV and an EVSE.

This document defines the communication messages and sequence requirements for bidirectional power

transfer.

This document furthermore defines requirements of wireless communication for both conductive

charging and wireless charging as well as communication requirements for automatic connection device

and information services about charging and control status.

The purpose of this document is to detail the communication between an electric vehicle communication

controller (EVCC) and a supply equipment communication controller (SECC). Aspects are specified to

detect a vehicle in a communication network and enable an Internet Protocol (IP) based communication

between the EVCC and the SECC (see Figure 1).
Key
1 scope of this document

2 message definition considers use cases defined for communication between SECC to SA

Figure 1 — Communication relationship among the EVCC, SECC and SA

This document defines messages, data model, XML/EXI-based data representation format, usage of

rd th

V2GTP, TLS, TCP and IPv6. These requirements belong to the 3 until the 7 OSI layer model. In addition,

the document describes main service sequences of conductive charging, wireless power transfer and

bidirectional power transfer, and how data link layer services can be accessed from an OSI layer 3

perspective.
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 3780, Road vehicles – World Manufacturer Indentifier (WMI) code
ISO 4217, Codes for the representation of currencies
© ISO 2022 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 15118-20:2022
ISO 15118-20:2022(E)

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 15118-8, Road Vehicles — Vehicle to grid communication interface — Part 8: Physical and data link

layer requirements for wireless communication

ISO 19363:2020, Electrically propelled vehicles—Magnetic field wireless power transfer—Safety and

interoperability requirements

ISO/IEC 11889-1:2015, Information technology — Trusted platform module library — Part 1: Architecture

IEC 61851-1:2017, Electric vehicle conductive charging system ― Part 1: General requirements

IEC 61851-23-1:2014, Electric vehicle conductive charging system - Part 23-1: DC Charging with an

automatic connection system

IEC 61980-2, Electric vehicle wireless power transfer (WPT) systems - Part 2: Specific requirements for

communication between electric road vehicle (EV) and infrastructure

IEC 63119-2 , Information exchange for Electric Vehicle charging roaming service ― Part 2: Use cases

EN 50696:2021, Contact interface for automated connection devices (ACD)
IETF RFC 768, User Datagram Protocol (August 1980)

IETF RFC 793, Transmission Control Protocol - DARPA Internet Program - Protocol Specification

(September 1981)
IETF RFC 2865, Remote Authentication Dial In User Service (RADIUS) (June 2000)
IETF RFC 2866, RADIUS Accounting (June 2000)

IETF RFC 3122, Extensions to IPv6 Neighbor Discovery for Inverse Discovery Specification (June 2001)

IETF RFC 3579, RADIUS (Remote Authentication Dial In User Service) Support For Extensible

Authentication Protocol (EAP) (September 2003)
IETF RFC 3748, Extensible Authentication Protocol (EAP) (June 2004)
IETF RFC 3986, Uniform Resource Identifier (URI): Generic Syntax (January 2005)
IETF RFC 4291, IP Version 6 Addressing Architecture (February 2006)

IETF RFC 4429, Optimistic Duplicate Address Detection (DAD) for IPv6 (April 2006)

IETF RFC 4443, Internet Control Message Protocol (ICMP v6) for the Internet Protocol version 6 (IPv6)

specification (March 2006)
Under preparation. Stage at the time of publication: IEC/CCDV 63119-2:2022.
2 © ISO 2022 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 15118-20:2022
ISO 15118-20:2022(E)

IETF RFC 4514, Lightweight Directory Access Protocol (LDAP): String Representation of Distinguished

Names (June 2006)
...

SLOVENSKI STANDARD
oSIST prEN ISO 15118-20:2022
01-marec-2022
Cestna vozila - Komunikacijski vmesnik med vozilom in omrežjem - 20. del:
Zahteve za omrežno in aplikacijsko plast druge generacije (ISO/FDIS 15118-
20:2022)

Road vehicles - Vehicle to grid communication interface - Part 20: 2nd generation

network layer and application layer requirements (ISO/FDIS 15118-20:2022)

Straßenfahrzeuge - Kommunikationsschnittstelle zwischen Fahrzeug und Ladestation -

Teil 20: 2. Generation Anforderungen an das Netzwerk- und Anwendungsprotokoll
(ISO/FDIS 15118-20:2022)

Véhicules routiers - Interface de communication entre véhicule et réseau électrique -

Partie 20: Exigences des couches réseau et application de 2ème génération (ISO/FDIS

15118-20:2022)
Ta slovenski standard je istoveten z: prEN ISO 15118-20
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 15118-20:2022 en,fr,de

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

---------------------- Page: 1 ----------------------
oSIST prEN ISO 15118-20:2022
---------------------- Page: 2 ----------------------
oSIST prEN ISO 15118-20:2022
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 15118-20
ISO/TC 22/SC 31
Road vehicles — Vehicle to grid
Secretariat: DIN
communication interface —
Voting begins on:
2022-01-05
Part 20:
Voting terminates on:
2nd generation network layer and
2022-03-02
application layer requirements
Véhicules routiers — Interface de communication entre véhicule et
réseau électrique —
Partie 20: Exigences des couches réseau et application de 2ème
génération
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 15118-20:2022(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 2022
---------------------- Page: 3 ----------------------
oSIST prEN ISO 15118-20:2022
ISO/FDIS 15118-20:2022(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2022

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
© ISO 2022 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 15118-20:2022
ISO/FDIS 15118-20:2022(E)
Contents Page

1 Scope .......................................................................................................................................................... 1

2 Normative references .......................................................................................................................... 1

3 Terms and definitions .......................................................................................................................... 4

4 Abbreviated terms ............................................................................................................................. 12

5 Conventions .......................................................................................................................................... 15

5.1 Definition of OSI based services .................................................................................................... 15

5.2 Requirement structure ..................................................................................................................... 15

5.3 Usage of references ............................................................................................................................ 16

5.4 Notation used for XML schema diagrams................................................................................... 16

6 Document overview ........................................................................................................................... 16

7 Basic requirements for V2G communication............................................................................ 17

7.1 General information .......................................................................................................................... 17

7.2 Service primitive concept of OSI layered architecture ......................................................... 18

Overview ................................................................................................................................................ 18

Syntax of service primitives ............................................................................................................ 18

7.3 Security concept .................................................................................................................................. 19

General ................................................................................................................................................... 19

Certificate and key management .................................................................................................. 21

Number of root certificates and root validity ........................................................................... 35

Support and application of TLS ..................................................................................................... 37

Firewall .................................................................................................................................................. 38

Protection of the cryptographic keys .......................................................................................... 38

Random number generation .......................................................................................................... 40

7.4 V2G communication states and data link handling ................................................................ 42

7.5 Data link layer ...................................................................................................................................... 46

Data link layer security for WLAN ................................................................................................ 46

7.6 Network link layer ............................................................................................................................. 51

General ................................................................................................................................................... 51

Applicable RFCs, limitations and protocol parameter settings ......................................... 51

IP addressing ........................................................................................................................................ 53

7.7 Transport layer ................................................................................................................................... 54

Transmission control protocol (TCP) ......................................................................................... 54

User datagram protocol (UDP) ...................................................................................................... 55

Transport layer security (TLS) ...................................................................................................... 56

7.8 V2G transfer protocol ........................................................................................................................ 82

General information .......................................................................................................................... 82

Supported ports .................................................................................................................................. 83

Protocol data unit ............................................................................................................................... 83

7.9 Presentation layer .............................................................................................................................. 87

XML and efficient XML interchange (EXI) .................................................................................. 87

Message security ................................................................................................................................. 90

7.10 Application layer .............................................................................................................................. 114

SECC discovery protocol ................................................................................................................ 114

8 Application layer messages ......................................................................................................... 127

8.1 General information and definitions ........................................................................................ 127

8.2 Protocol handshake definition ................................................................................................... 128

Handshake sequence ...................................................................................................................... 128

Message definition supportedAppProtocolReq and supportedAppProtocolRes ..... 130

Semantics description supportedAppProtocol messages................................................. 131

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Message examples ............................................................................................................................ 132

8.3 V2G message definition .................................................................................................................. 133

Overview ............................................................................................................................................. 133

General ................................................................................................................................................. 134

Header definition ............................................................................................................................. 134

Request and response definitions .............................................................................................. 137

Complex data types .......................................................................................................................... 243

8.4 Service selection ............................................................................................................................... 364

General ................................................................................................................................................. 364

General description of configuration parameters ............................................................... 365

Selection of service and service parameters .......................................................................... 366

8.5 V2G communication timing .......................................................................................................... 376

Overview ............................................................................................................................................. 376

Common ............................................................................................................................................... 377

DC service ............................................................................................................................................ 377

Message sequence and communication session ................................................................... 378

Session setup and ready to charge ............................................................................................. 384

V2G message synchronization for AC and DC with IEC 61851-1 signalling ................ 390

V2G message synchronization with IEC 61980-2 signalling for WPT ........................... 397

8.6 Message sequencing and error handling ................................................................................. 397

Overview ............................................................................................................................................. 397

Basic definitions for error handling .......................................................................................... 397

ResponseCode handling ................................................................................................................. 398

Request-response message sequence requirements .......................................................... 409

Multiplexed communication ........................................................................................................ 437

Message sequence diagrams ........................................................................................................ 439

Annex A (normative) Schema definition ................................................................................................. 444

Annex B (normative) Certificate profiles ............................................................................................... 446

B.1 Overview ............................................................................................................................................. 446

B.2 General ................................................................................................................................................. 449

B.2.1 Mandatory versus optional........................................................................................................... 450

B.2.2 Critical versus non-critical............................................................................................................ 451

B.2.3 Common requirements for all certificate profiles ............................................................... 455

B.3 V2G root CA certificate profiles ................................................................................................... 457

B.3.1 Based on curves as defined by [V2G20-2674] ....................................................................... 457

B.3.2 Based on curves as defined by [V2G20-2319] ....................................................................... 458

B.4 Charge point operator certificate profiles .............................................................................. 460

B.4.1 Based on curves as defined by [V2G20-2674] ....................................................................... 460

B.4.2 Based on curves as defined by [V2G20-2319] ....................................................................... 462

B.4.3 Common requirements for charge point operator certificate profiles ........................ 463

B.5 Certificate provisioning service certificate profiles ............................................................ 464

B.5.1 Based on curves as defined by [V2G20-2674] ....................................................................... 464

B.5.2 Based on curves as defined by [V2G20-2319] ....................................................................... 465

B.5.3 Common requirements for certificate provisioning service certificate profiles ...... 467

B.6 e-Mobility service provider certificate profiles .................................................................... 468

B.6.1 Based on curves as defined by [V2G20-2674] ....................................................................... 468

B.6.2 Based on curves as defined by [V2G20-2319] ....................................................................... 471

B.6.3 Common requirements for e-mobility service provider certificate profiles.............. 474

B.7 OEM provisioning certificate profiles ....................................................................................... 476

B.7.1 Based on curves as defined by [V2G20-2674] ....................................................................... 476

B.7.2 Based on curves as defined by [V2G20-2319] ....................................................................... 479

B.7.3 Common requirements for OEM provisioning certificate profiles................................. 482

B.8 Vehicle certificate profiles ............................................................................................................ 483

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B.8.1 Based on curves as defined by [V2G20-2674] ....................................................................... 484

B.8.2 Based on curves as defined by [V2G20-2319] ....................................................................... 485

B.8.3 Common requirements for vehicle certificate profiles ..................................................... 487

B.9 Cross certificate & OCSP signer certificate profiles ............................................................. 488

B.9.1 Based on curves as defined by [V2G20-2674] ....................................................................... 488

B.9.2 Based on curves as defined by [V2G20-2319] ....................................................................... 490

B.9.3 Common requirements for cross certificate & OCSP signer certificate profiles ....... 492

B.10 Private environment certificate profiles ................................................................................ 493

B.10.1 Based on curves as defined by [V2G20-2674] ....................................................................... 493

B.10.2 Based on curves as defined by [V2G20-2319] ....................................................................... 496

B.10.3 Common requirements for private environment certificate profiles .......................... 498

Annex C (normative) Specification of identifiers ................................................................................ 500

C.1 e-Mobility authentication identifier (EMAID) ....................................................................... 500

C.1.1 EMAID syntax .................................................................................................................................... 500

C.2 Provisioning certificate identifier (PCID) ............................................................................... 500

C.2.1 PCID syntax ........................................................................................................................................ 500

C.2.2 PCID semantics ................................................................................................................................. 501

C.3 Supply equipment communications controller identifier (SECCID) ............................. 501

C.3.1 SECCID syntax .................................................................................................................................... 501

C.3.2 SECCID semantics ............................................................................................................................. 502

C.4 Electric vehicle supply equipment ID (EVSEID) ................................................................... 503

C.4.1 EVSEID syntax ................................................................................................................................... 503

C.5 Electric vehicle communication controller ID (EVCCID) ................................................... 503

C.5.1 EVCCID syntax ................................................................................................................................... 503

C.5.2 EVCCID semantics ............................................................................................................................ 504

C.6 Calculation of the check digit ...................................................................................................... 504

Annex D (informative) ACDP ...................................................................................................................... 506

D.1 Coordinate system definition for ACDP with inverted pantograph .............................. 506

D.1.1 Coordinate system definitions .................................................................................................... 506

Annex E (informative) Basic PPD for interoperability ...................................................................... 508

E.1 Overview ............................................................................................................................................. 508

E.2 RFID implementation (recommended) ................................................................................... 508

E.2.1 Functional description ................................................................................................................... 508

Annex F (informative) Message sequencing for renegotiation ...................................................... 511

F.1 Overview ............................................................................................................................................. 511

F.2 Renegotiation after resuming a V2G communication session......................................... 512

Annex G (informative) Association of VAS client to V2G session ................................................... 513

Annex H (informative) Application of certificates .............................................................................. 514

H.1 General information ....................................................................................................................... 514

H.1.1 Overview ............................................................................................................................................. 514

H.1.2 Demands of the OEM ....................................................................................................................... 515

H.1.3 Demands of the secondary actors .............................................................................................. 516

H.1.4 Rationale for decisions in this document ............................................................................... 516

H.1.5 Cross certification............................................................................................................................ 518

H.1.6 Examples of the resulting certificate structure .................................................................... 522

H.2 Simplified certificate management in private environment ........................................... 531

H.2.1 Overview ............................................................................................................................................. 531

H.2.2 Solution for private environments ............................................................................................ 534

H.2.3 Security considerations of using private environment credentials .............................. 538

H.3 Solution for emergency and disaster situations ................................................................... 539

H.4 Use of OEM provisioning certificates ........................................................................................ 539

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H.5 Offline contract certificate installation .................................................................................... 540

H.5.1 Processes ............................................................................................................................................. 541

H.6 Risks of root CA compromise ....................................................................................................... 542

H.7 Security appliances and their associated certificates ......................................................... 543

Annex I (informative) Precision of measurements and tolerances .............................................. 549

Annex J (informative) Absolute pricing examples .............................................................................. 551

J.1 Overview ............................................................................................................................................. 551

J.2 Simple examples ............................................................................................................................... 551

J.2.1 Parking fee only ................................................................................................................................ 551

J.2.2 Energy fee only .................................................................................................................................. 551

J.2.3 Energy and taxes .............................................................................................................................. 552

J.2.4 Minimum and maximum cost ...................................................................................................... 552

J.3 Less simple examples ..................................................................................................................... 553

J.3.1 Different rates for different days ............................................................................................... 553

J.3.2 Different rates for different power levels ............................................................................... 554

J.3.3 Different rates for different power levels including reverse power ............................. 554

J.3.4 Overstay after charging finished ................................................................................................ 555

J.3.5 Stacked prices .................................................................................................................................... 556

Bibliography ..................................................................................................................................................... 559

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Foreword

ISO (the International Organization for Standardization) and IEC (the International Electrotechnical

Commission) form the specialized system for worldwide standardization. National bodies that are

members of ISO or IEC participate in the development of International Standards through technical

committees established by the respective organization to deal with particular fields of technical activity.

ISO and IEC technical committees collaborate in fields of mutual interest. Other international

organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the

work.

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 document 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 or
www.iec.ch/members_experts/refdocs).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO and IEC 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) or the IEC list of patent

declarations received (see https://patents.iec.ch).

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. In the IEC, see www.iec.ch/understanding-standards.

This document was prepared jointly by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC

31, Data communication, Technical Committee IEC/TC 69, Electrical power/energy transfer systems for

electrically propelled road vehicles and industrial trucks, in collaboration with the European Committee

for Standardization (CEN) Technical Committee CEN/TC 301, Electrically propelled road ve

...

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