IEC 63119-1:2019

IEC 63119-1 ®
Edition 1.0 2019-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Information exchange for electric vehicle charging roaming service –
Part 1: General
Échange d'informations pour le service d'itinérance de la recharge des
véhicules électriques –
Partie 1: Généralités
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IEC 63119-1 ®
Edition 1.0 2019-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Information exchange for electric vehicle charging roaming service –

Part 1: General
Échange d'informations pour le service d'itinérance de la recharge des

véhicules électriques –
Partie 1: Généralités
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 43.120; 29.130.20; 35.240.01 ISBN 978-2-8322-7102-5

– 2 – IEC 63119-1:2019 © IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 General description for roaming service models. 8
4.1 General . 8
4.2 System architecture . 9
4.3 Communication interfaces . 10
5 Classification of roaming service models – Roaming modes . 11
6 Communication – Protocol stack . 12
7 Security and privacy . 12
7.1 General requirements . 12
7.2 Authentication and authorization . 13
7.3 Data transfer security . 13
8 Privacy mechanisms . 13
Bibliography . 14

Figure 1 – Overview of roaming and relevant technologies. 9
Figure 2 – Overview of system architecture. 10
Figure 3 – Overview of EV services and communication interfaces . 11
Figure 4 – Overview of EV roaming classification . 12

Table 1 – Network communication protocols . 12

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
INFORMATION EXCHANGE FOR ELECTRIC
VEHICLE CHARGING ROAMING SERVICE –

Part 1: General
FOREWORD
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International Standard IEC 63119-1 has been prepared by IEC technical committee 69:
Electric road vehicles and electric industrial trucks.
The text of this International Standard is based on the following documents:
FDIS Report on voting
69/654/FDIS 69/659/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 63119 series, published under the general title Information
exchange for electric vehicle charging roaming service, can be found on the IEC website.

– 4 – IEC 63119-1:2019 © IEC 2019
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
INFORMATION EXCHANGE FOR ELECTRIC
VEHICLE CHARGING ROAMING SERVICE –

Part 1: General
1 Scope
This part of IEC 63119 establishes a basis for the other parts of IEC 63119, specifying the
terms and definitions, general description of the system model, classification, information
exchange and security mechanisms for roaming between EV charge service providers (CSPs),
charging station operators (CSOs) and clearing house platforms through roaming endpoints. It
provides an overview and describes the general requirements of the EV roaming service
system.
IEC 63119 (all parts) is applicable to high-level communication involved in information
exchange/interaction between different CSPs, as well as between a CSP and a CSO with or
without a clearing house platform through the roaming endpoint.
IEC 63119 (all parts) does not specify the information exchange, either between the charging
station (CS) and the charging station operator (CSO), or between the EV and the CS.
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.
RFC 5246, The Transport Layer Security (TLS) Protocol Version 1.2
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
electric vehicle
EV
electric road vehicle
vehicle propelled by an electric motor drawing current from a rechargeable storage battery or
from other portable energy storage devices (rechargeable, using energy from a source off the
vehicle such as a residential or public electric service), which is manufactured primarily for
use on public streets, roads or highways
[SOURCE: IEC 61851-1:2017, 3.4.1, modified – The definition has been expanded.]

– 6 – IEC 63119-1:2019 © IEC 2019
3.2
electric vehicle user
EV user
person or legal entity using the vehicle and providing information about its needs
[SOURCE: IEC TS 62913-2-4:2019, Table 3]
3.3
electric vehicle supply equipment
EVSE
equipment or a combination of equipment that provides dedicated functions to supply electric
energy from a fixed electrical installation or supply network to an EV for the purpose of
charging and discharging
Note 1 to entry: This note applies to the French language only.
3.4
charge service provider
CSP
role that manages and authenticates EV user’s credentials and provides the billing and other
value-added services to the customer
Note 1 to entry: A CSP is a specialized type of EMSP.
Note 2 to entry: This note applies to the French language only.
3.5
charging station operator
CSO
party responsible for the provisioning and operation of the charging infrastructure (including
charging sites), and managing electricity to provide requested energy transfer services
Note 1 to entry: The party shall operate a roaming endpoint to achieve a roaming service.
Note 2 to entry: This note applies to the French language only.
3.6
EMSP
e-mobility service provider
party responsible for providing high-value service related to the use of an EV (renting an EV,
reservation of parking service, navigation services, energy services which include charging
station provider in relation with CSO…)
Note 1 to entry: This note applies to the French language only.
[SOURCE: IEC TS 62913-2-4:2019, Table 3]
3.7
roaming
information exchanges and related provisions between CSPs, which allow EV users to use a
single credential and contract to access services on multiple e-mobility networks and contract
to access the charging services provided by multiple CSPs or CSOs through roaming
endpoints
3.8
clearing house
CH
mobility clearing house
MCH
roaming platform
e-mobility clearing house
E_MOCH
optional intermediate actor that facilitates authorization, billing and settling procedure for EV
charging service roaming, between two clearing partners
Note 1 to entry: The terms "MCH" (mobility clearing house), "roaming platform" and "E_MOCH" (E-mobility
clearing house) in different regions.
Note 2 to entry: This note applies to the French language only.
3.9
credential
physical or digital asset that carries the roaming service user's identity or contract ID, which is
used for authentication and security purposes
EXAMPLES
• static or dynamic QR code;
• username/password;
• RFID card;
• digital certificate transferred through the plug and charge process.
3.10
service detail record
SDR
data package containing all necessary information within one unique identification which is
needed for billing or informing of/about a service session of a specific customer
Note 1 to entry: This note applies to the French language only.
3.11
charging session
collection of charging transactions at a charge point related only to the charging of an electric
car 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.
3.12
service session
collection of services around a charge point mainly related to the charging of an electric car
assigned to a specific customer in a specific timeframe with a unique identifier
3.13
charging transaction
smallest billable part of a charging session representing the transfer of energy in a specific
timeframe
3.14
roaming endpoint
RE
entity containing all the related roaming functions
Note 1 to entry: This note applies to the French language only.

– 8 – IEC 63119-1:2019 © IEC 2019
3.15
charging station
CS
physical equipment consisting one or more EVSEs managing the energy transfer to and from
EVs
Note 1 to entry: This note applies to the French language only.
3.16
energy transfer service
unit of continuous energy transfer between EVSE and EV battery
3.17
distribution system operator
DSO
party operating a distribution system.
Note 1 to entry: This note applies to the French language only.
[SOURCE: IEC 60050-617:2009, 617-02-10, modified – The terms "distribution network
operator" and "distributor" have been deleted, and Note 1 to entry has been added.]
4 General description for roaming service models
4.1 General
The IEC 63119 series covers roaming-related communication exchange. Clause 4 specifies
the general relationship of roaming with the relevant technologies.
Figure 1 shows an overview of roaming, grid and transportation technology. There could be
other related technologies which are not presented in this chart. And not all interface
reference points are plotted.
The information exchange of roaming focuses on actors between different CSPs, as well as
between a CSP and CSO with or without clearing house platform through the roaming
endpoint. The clearing house is an optional actor to complete the roaming functions, which
can be completely or partially executed directly between different service providers.
For connections between grid and roaming technologies, there is a connection between the
CSO and charging station. To implement the smart grid function, there could be other optional
communication connections. For example, the distribution system operator may send the
smart charging profile directly to the CSP.
For connections between roaming, grid and transportation technologies, it is also possible to
have information exchange between the intelligent transportation system (ITS) and the
roaming systems.
Figure 1 – Overview of roaming and relevant technologies
4.2 System architecture
Figure 2 shows an overview of the system architecture for EV roaming services. The basic
actors and their related controllers and systems are as follows:
• Electric vehicle (EV): this normally includes a controller for external information flow,
which negotiates and manages energy transfer between the EV and EVSE, exchanges EV
and EVSE ID info, etc.
• EV supply equipment (EVSE): for networked EVSE, this normally includes a controller for
charging communication, which negotiates and manages energy transfer between the EV
and EVSE, exchanges EV and EVSE ID info, etc.
• Charging station operator (CSO): the CSO system manages the charging process of the
EVSE and forwards charging session information to the charge service provider or
roaming endpoint. A single entity can have both CSO and CSP roles.
• Charge service provider (CSP): for roaming services, both CSP and CSO may be involved
through a roaming endpoint. For roaming between CSPs, the visited CSP collects
metering data and charging session information from visited CSO, then creates a service
detail record (SDR), and forwards the SDR to a home CSP through either a clearing house
or directly.
• Clearing house (CH): the intermediate actor to facilitate EV charge roaming services. This
role is not required, but can provide centralized service efficiency when there are many
service providers. Each clearing house may have its own system for facilitating information
exchange, billing and settlements.

– 10 – IEC 63119-1:2019 © IEC 2019

Figure 2 – Overview of system architecture
4.3 Communication interfaces
Figure 3 shows the primary actors, systems and communication interface reference points
involved in the EV service.
• I1: Interface between EVSE and EV. The main functions include power supply
management and charging session management.
• I2: Interface between EVSE and CSO. The functions supported by this interface can
include credential authentication, EVSE charging status exchange, and charging session
management.
• I3: Interface between roaming endpoint and clearing house. It specifies the EV roaming
process through a centralized clearing house mode. The roaming functions can include
credential authentication, EVSE charging status exchange, charging session remote
control and management, and charging transaction billing and settlement.
• I4: Interface between two roaming endpoints. It specifies the EV roaming process through
peer-to-peer direct mode. The roaming functions can include credential authentication,
EVSE charging status exchange, charging session remote control and management, and
charging transaction billing and settlement.
• I5: Interface for the transfer of user credentials through EVSE. Example credentials
include RFID cards, credit cards or user/password inputs from station displays or a QR
code displayed on a user device.
• I6: Interface for user credentials sent through a mobile app or other method to the CSP.
Supported credentials include static or dynamic QR code, and username/password.
• I7: Interface between CSP and CSO. This can be an internal interface within one entity or
an external interface between two entities.

Figure 3 – Overview of EV services and communication interfaces
5 Classification of roaming service models – Roaming modes
In Figure 4, roaming types are classified according to three basic modes: peer-to-peer or
direct mode, clearing house mode, and mixed mode, depending on whether there is an
intermediary to facilitate the roaming process as regards different types of roaming functions.
The difference between the clearing house mode and the mixed mode is determined by the
charging service module. To allow for a quicker response and an improved user experience,
the mixed mode allows for direct communication between different roaming endpoints to
initiate and control charging sessions. Other service modules are processed in same way.
Both clearing house mode and mixed mode are divided into two sub-types based on the
authorization mechanism. The user credentials to authorize EV charging services can be
issued either by the clearing house, or by individual CSPs.
The choice of the mode can be determined based on business and technical considerations.

– 12 – IEC 63119-1:2019 © IEC 2019

Figure 4 – Overview of EV roaming classification
6 Communication – Protocol stack
Recommendations for communication protocols used in I3, I4 include, but are not restricted to,
those in Table 1.
Table 1 – Network communication protocols
OSI model Protocol Function
Application (layer 7) I3/I4 interface (HTTP) Define the service interfaces involved.
Presentation (layer 6) Protocol Define the message structure and encoding rules.
SOAP/XML JSON
buffer
Session (layer 5) Provide communications' security over the network.
TLS
Transport (layer 4) Enable Internet connectivity and process data from
TCP
applications.
7 Security and privacy
7.1 General requirements
All servers offering roaming service functions shall provide secure interfaces, as described in
Clause 6. The servers shall be protected by security software with anti-virus detection, attack
detection, network firewall, and other functions.
The information system shall have authentication mechanisms to identify the source of
messages (e.g. HMAC), in order to determine if the message is from a trustworthy source.
Recommendations for specific security mechanisms in HTTP/HTTPS will often be taken from
existing works, including:
– [RFC 5246] The Transport Layer Security (TLS) Protocol Version 1.2;
– [AES] Advanced Encryption Standard;
– [DES] Data Encryption Standard

7.2 Authentication and authorization
The combination of a username and password is adopted in identity authentication. Secure,
reliable and general cryptographic algorithms shall be applied to provide encryption of the
password sent over the network.
After successful identity authentication, an authorized session is created to transmit data.
A token shall be generated for the session in progress, and users can access data within the
scope of their authorizations using the token.
A certain validity period (e.g. 20 min) is assigned to tokens. Authorizations are valid within
that period, after which a re-delegation of authority is required.
7.3 Data transfer security
Secure, reliable and general cryptographic algorithms shall be applied to provide for the
encryption of data sent over the network. Recommendations for cryptographic algorithms
include but are not restricted to the following: RSA, MD5, AES128, 3DES, etc.
8 Privacy mechanisms
The protection of personal or personal-related data is a crucial principle in setting up reliable
business in a connected world, where different parties are involved. Therefore, data privacy is
regulated in many countries worldwide. As a basic principle, privacy by design should be used.
Privacy by design means you collect and process only the data which you need directly for
fulfilling the needed use cases or which is mandatory through regulations. Data should also
be stored only as long as needed and not longer. Another principle which needs to be
followed is transparency to the user; the user should be informed as to which data is collected
and for which purposes, and how long the data is kept. Also, an important factor is that the
systems should be built such that all user-relevant data can be deleted permanently on the
request of the user, because the user has the right to be forgotten. Additionally, a strong
separation of concerns should be followed.
The following principles are recommended by this document:
• privacy by design;
• transparency to the user;
• the right to be forgotten;
• separation of concerns;
• anonymization, wherever possible.

– 14 – IEC 63119-1:2019 © IEC 2019
Bibliography
IEC 61851-1:2017, E
...