Road vehicles - Vehicle to grid communication interface - Part 20: Network and application protocol 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.

General Information

Status
Published
Publication Date
25-Apr-2022
Current Stage
PPUB - Publication issued
Completion Date
03-May-2022
Ref Project

Buy Standard

Standard
ISO 15118-20:2022 - Road vehicles - Vehicle to grid communication interface - Part 20: Network and application protocol requirements
English language
561 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (sample)

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: 1 ----------------------
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: 2 ----------------------
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: 3 ----------------------
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: 4 ----------------------
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: 5 ----------------------
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: 6 ----------------------
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: 7 ----------------------
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: 8 ----------------------
ISO 15118-20:2022(E)

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

Names (June 2006)
IETF RFC 4861, Neighbor Discovery for IP version 6 (IPv6) (September 2007)
IETF RFC 4862, IPv6 Stateless Address Autoconfiguration (September 2007)

IETF RFC 5116, An Interface and Algorithms for Authenticated Encryption (January 2008)

IETF RFC 5216, The EAP-TLS Authentication Protocol (March 2008)
IETF RFC 5234, Augmented BNF for Syntax Specifications: ABNF (January 2008)

IETF RFC 5480, Elliptic Curve Cryptography Subject Public Key Information (March 2009)

IETF RFC 5722, Handling of Overlapping IPv6 Fragments (December 2009)

IETF RFC 6066, Transport Layer Security (TLS) Extensions: Extension Definitions (January 2011)

IETF RFC 6724, Default Address Selection for Internet Protocol version 6 (IPv6) (September 2012)

IETF RFC 6818, Updates to the Internet X.509 Public Key Infrastructure Certificate and Certificate

Revocation List (CRL) Profile (January 2013)

IETF RFC 6874, Representing IPv6 Zone Identifiers in Address Literals and Uniform Resource Identifiers

(February 2013)

IETF RFC 6960, X.509 Internet Public Key Infrastructure Online Certificate Status Protocol - OCSP (June

2013)
IETF RFC 7405, Case-Sensitive String Support in ABNF (December 2014)
IETF RFC 7748, Elliptic Curves for Security (January 2016)
IETF RFC 8032, Edwards-Curve Digital Signature Algorithm (EdDSA) (January 2017)
IETF RFC 8200, Internet Protocol, Version 6 (IPv6) Specification (July 2017)
IETF RFC 8201, Path MTU Discovery for IP version 6 (July 2017)

IETF RFC 8398, Internationalized Email Addresses in X.509 Certificates (May 2018)

IETF RFC 8399, Internationalization Updates to RFC 5280 (May 2018)

IETF RFC 8415, Dynamic Host Configuration Protocol for IPv6 (DHCPv6) (November 2018)

IETF RFC 8439, ChaCha20 and Poly1305 for IETF Protocols (June 2018)

IETF RFC 8446, The Transport Layer Security (TLS) Protocol Version 1.3 (August 2018)

IETF RFC 8504, IPv6 Node Requirements (January 2019)
IETF RFC 8335, PROBE: A Utility for Probing Interfaces (February 2018)

ANSI X9.62, Public Key Cryptography For The Financial Services Industry: The Elliptic Curve Digital

Signature Algorithm (ECDSA) (2005)
© ISO 2022 – All rights reserved 3
---------------------- Page: 9 ----------------------
ISO 15118-20:2022(E)

W3C EXI 1.0, Efficient XML Interchange (EXI) Format 1.0, W3C Recommendation (March 2011)

IANA Service & Port Registry, Service Name and Transport Protocol Port Number Registry [viewed 2011-

01-16], Available from: http://www.iana.org/assignments/service-names-port-numbers/service-

names-port-numbers.xml
NIST FIPS PUB 180-4, Secure Hash Standard (SHS) (March 2012)

NIST FIPS PUB 202, SHA-3 Standard: Permutation-Based Hash and Extendable-Output Functions (August

2015)

ITU-T X.509, Information technology — Open Systems Interconnection — The Directory: Public-key and

attribute certificate frameworks (October 2019)

IEEE 802.1X-2020, IEEE Standard for Local and Metropolitan Area Networks--Port-Based Network Access

Control (January, 2020)
WPA3, WPA3 Specification Version 3.0 (December 2020)

NIST Special Publication 800-38D, Recommendation for Block Cipher Modes of Operation: Galois/Counter

Mode (GCM) and GMAC (November 2007)

NIST Special Publication 800-56A, Revision 3, Recommendation for Pair-Wise Key Establishment Schemes

Using Discrete Logarithm Cryptography (April 2018)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

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

— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
access point

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

devices
3.2
authorization mode
authenticate and authorize the user account
Note 1 to entry: Authorization mode refers to EIM (3.17) and PnC (3.41).
3.3
automatic connection device pantograph
ACDP

components supporting the automatic connection and disconnection process for conductive energy

transfer between an EV and EVSE via pantograph
3.4
basic charging
4 © ISO 2022 – All rights reserved
---------------------- Page: 10 ----------------------
ISO 15118-20:2022(E)
charging based on PWM
Note 1 to entry: According to ISO/IEC 11889-1:2015, Annex A.
3.5
certificate

electronic document which uses a digital signature to bind a public key with an identity

Note 1 to entry: The ISO 15118 series describe several certificates covering different purposes [e.g. contract

certificate including the EMAID (3.19) and OEM (3.36) provisioning certificates].

3.6
charging limit
set of physical constraints that is negotiated during a service session (3.50)
EXAMPLE Voltage, current, energy, power, etc.
3.7
charging session

collection of charging transactions at a charge point related only to the charging of an electric vehicle

assigned to a specific customer in a specific timeframe with a unique identifier

Note 1 to entry: The charging session is a subset of the service session (3.50).

3.8
charging station operator
CSO

secondary actor responsible for the installation and operation of a charging infrastructure (including

charging sites), and the management of electricity to provide the requested energy transfer services

Note 1 to entry: The term CSO for charge point operator is also used in other ISO 15118 documents. This term is

not recommended for trademark reasons.
3.9
communication session

sequence of time where EVCC (3.21) and SECC (3.47) interactively exchange digital information in order

to manage charging or discharging the EV battery

Note 1 to entry: A communication session can be paused and resumed later several times. The communication

session encapsulates zero or more ener
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.