ISO 15118-2:2014

INTERNATIONAL ISO
STANDARD 15118-2
First edition
2014-04-01
Road vehicles — Vehicle-to-Grid
Communication Interface —
Part 2:
Network and application protocol
requirements
Véhicules routiers — Interface de communication entre véhicule et
réseau électrique —
Partie 2: Exigences du protocole d'application et du réseau

Reference number
©
ISO 2014
©  ISO 2014
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ii © ISO 2014 – All rights reserved

Contents Page
Foreword . v
Introduction . vi
1  Scope . 1
2  Normative references . 1
3  Terms and definitions . 3
4  Symbols and abbreviated terms . 7
5  Conventions . 8
5.1  Definition of OSI based services . 8
5.2  Requirement structure . 8
5.3  Usage of RFC references . 8
5.4  Notation used for XML schema diagrams . 9
6  Document overview . 9
7  Basic requirements for V2G communication . 11
7.1  General information . 11
7.2  Service primitive concept of OSI layered architecture . 11
7.3  Security concept . 12
7.4  V2G communication states and data link handling . 21
7.5  Data Link Layer . 26
7.6  Network Layer . 26
7.7  Transport Layer . 28
7.8  V2G Transfer Protocol . 32
7.9  Presentation Layer . 36
7.10  Application Layer . 46
8  Application Layer messages . 55
8.1  General information and definitions . 55
8.2  Protocol handshake definition . 56
8.3  V2G Message Definition . 60
8.4  V2G Communication Session and BodyElement Definitions . 62
8.5  Complex data types . 104
8.6  Identification Modes and Message Set definitions . 137
8.7  V2G communication timing . 170
8.8  Message sequencing and error handling . 184
8.9  Request-Response Message Sequence examples . 206
Annex A (informative) Mapping of Part 1 use case elements . 214
Annex B (informative) Mapping of ISO 15118 message element names to SAE J2847/2 terms . 250
Annex C (normative) Schema definition . 254
Annex D (informative) Message examples . 278
Annex E (informative) Application of certificates . 299
Annex F (normative) Certificate profiles . 313
Annex G (informative) Encryption for the Distribution of Secret Keys . 321
Annex H (normative) Specification of Identifiers . 323
Annex I (informative) Message sequencing for renegotiation . 326
Annex J (informative) Overview on XML Signatures . 330
Annex K (informative) Summary of requirements . 334
Bibliography . 341

iv © ISO 2014 – All rights reserved

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of
ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any patent
rights identified during the development of the document will be in the Introduction and/or on the ISO list of
patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO's adherence to the WTO principles in the Technical Barriers to Trade (TBT)
see the following URL: Foreword - Supplementary information
The committee responsible for this document is ISO/TC 22, Road vehicles, Subcommittee SC 3, Electrical
and electronic equipment.
ISO 15118-2 was developed in conjunction with IEC TC 69, Electric road vehicles and electric industrial
trucks.
ISO 15118 consists of the following parts, under the general title Road vehicles — Vehicle-to-Grid
Communication Interface:
 Part 1: General information and use-case definition
 Part 2: Network and application protocol requirements
 Part 3: Physical and data link layer requirements

To be published.
Introduction
The pending energy crisis and necessity to reduce greenhouse gas emissions has led the vehicle
manufacturers to a very significant effort to reduce the energy consumption of their vehicles. They are
presently developing vehicles partly or completely propelled by electric energy. Those vehicles will reduce the
dependency on oil, improve the global energy efficiency and reduce the total CO emissions for road
transportation if the electricity is produced from renewable sources. To charge the batteries of such vehicles,
specific charging infra-structure is required.
Much of the standardization work on dimensional and electrical specifications of the charging infrastructure
and the vehicle interface is already treated in the relevant ISO or IEC groups. However the question of
information transfer between the EV and the EVSE has not been treated sufficiently.
Such communication is necessary for the optimization of energy resources and energy production systems so
that vehicles can recharge in the most economical or most energy efficient way. It is also required to develop
efficient and convenient billing systems in order to cover the resulting micro-payments. The necessary
communication channel may serve in the future to contribute to the stabilization of the electrical grid as well as
to support additional information services required to operate electric vehicles efficiently and economically.
vi © ISO 2014 – All rights reserved

INTERNATIONAL STANDARD ISO 15118-2:2014(E)

Road vehicles — Vehicle-to-Grid Communication Interface —
Part 2: Network and application protocol requirements
1 Scope
This part of ISO 15118 specifies the communication between battery electric vehicles (BEV) or plug-in hybrid
electric vehicles (PHEV) and the Electric Vehicle Supply Equipment. The application layer message set
defined in this part of ISO 15118 is designed to support the energy transfer from an EVSE to an EV. ISO
15118-1 contains additional use case elements (Part 1 Use Case Element IDs: F4 and F5) describing the
bidirectional energy transfer. The implementation of these use cases requires enhancements of the
application layer message set defined herein. The definitions of these additional requirements will be subject
of the next revision of this International Standard.
The purpose of this part of ISO 15118 is to detail the communication between an EV (BEV or a PHEV) and an
EVSE. Aspects are specified to detect a vehicle in a communication network and enable an Internet Protocol
(IP) based communication between EVCC and SECC.

Key
1 Scope of ISO/IEC FDIS 15118-2:2013(E)
2 Message definition considers use cases defined for communication between SECC to SA
Figure 1 — Communication relationship among EVCC, SECC and secondary actor
This part of ISO 15118 defines messages, data model, XML/EXI based data representation format, usage of
V2GTP, TLS, TCP and IPv6. In addition, it describes how data link layer services can be accessed from a
layer 3 perspective. The Data Link Layer and Physical Layer functionality is described in ISO 15118-3.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 3166-1, Codes for the representation of names of countries and their subdivisions ― Part 1: Country
codes
ISO 15118-1, Road vehicles ― Vehicle to grid communication interface ― Part 1: General information and
use-case definition
IEC 61851-1, Electric vehicle conductive charging system ― Part 1: General requirements (Ed 2.0 2010)
IEC 61851-22, Electric vehicle conductive charging system - Part 22: AC electric vehicle charging station
IEC CDV 61851-23, Electric vehicle conductive charging system - Part 23: D.C. electric vehicle charging
station (Ed 1.0 2012)
IEC 62196, Plugs, socket-outlets, vehicle connectors and vehicle inlets - Conductive charging of electric
vehicles
W3C EXI 1.0, Efficient XML Interchange (EXI) Format 1.0, W3C Recommendation (March 2011)
W3C XML Signature Syntax and Pro
...