IEC 63119-1:2025

IEC 63119-1 ®
Edition 2.0 2025-07
INTERNATIONAL
STANDARD
REDLINE VERSION
Information exchange for electric vehicle charging roaming service –
Part 1: General
ICS 43.120; 29.130.20; 35.240.01 ISBN 978-2-8327-0576-6
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CONTENTS
FOREWORD . 2
1 Scope . 1
2 Normative references . 5
3 Terms and definitions . 5
4 General description for roaming service models . 6
4.1 General . 8
4.2 System architecture . 11
4.3 Communication interfaces . 11
5 Classification of roaming service models – Roaming modes . 14
6 Communication – Protocol stack . 14
7 Security and privacy . 15
7.1 General requirements . 15
7.2 Authentication and authorization . 15
7.3 Data transfer security . 15
8 Privacy mechanisms . 15
Bibliography . 17

Figure 1 – Overview of roaming and relevant technologies . 10
Figure 2 – Overview of system architecture . 11
Figure 3 – Overview of EV services and communication interfaces . 13
Figure 4 – Overview of EV roaming classification . 14

Table 1 – Network communication protocols . 15

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Information exchange for electric vehicle charging roaming service -
Part 1: General
FOREWORD
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This redline version of the official IEC Standard allows the user to identify the changes made
to the previous edition IEC 63119-1:2019. A vertical bar appears in the margin wherever a
change has been made. Additions are in green text, deletions are in strikethrough red text.

IEC 63119-1 has been prepared by IEC technical committee 69: Electrical power/energy
systems for electrically propelled road vehicles and industrial trucks. It is an International
Standard.
This second edition cancels and replaces the first edition published in 2019.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the scope is expanded to include differentiation between home and visited service provider
roles and adds an explicit definition of roaming entity;
b) adds definitions for "home charging service provider (home-CSP)", "visited charging station
operator (visited-CSO)", and "charging detail record (CDR)", and expands related terms
such as "service" and "roaming entity";
c) introduces abbreviation variants for "home-CSP" and "visited-CSO" in the terminology,
aligning with North American and European conventions;
d) updates the communication protocol stack by adopting a newer TLS version (upgraded from
1.2 to 1.3);
e) system architecture and communication interfaces include detailed interactions between
home-CSP and visited-CSO;
f) adds a definition for "service" to cover a broader range of applications such as parking and
reservation management;
g) adds a distinction between "charging detail record (CDR)" and "service detail record (SDR)"
and clarifies their relationship in the terminology;
h) enhances the description of user credential transfer methods in communication interfaces
with greater diversity;
i) enhances the description of the mixed mode in the classification of roaming service models,
emphasizing improved user experience through faster response times.
The text of this International Standard is based on the following documents:
Draft Report on voting
69/1050/FDIS 69/1063/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
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.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
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 charging 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.
The IEC 63119 series 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.
The IEC 63119 series 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
There are no normative references in this document.
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:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://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 of 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 and the note
to entry has been deleted.]
3.2
service
suite of functions provided by the service provider to the EV users, such as energy transfer,
reservation management, parking, etc.
3.3
electric vehicle user
EV user
person or legal entity using the vehicle and providing information about its needs
[SOURCE: IEC TS SRD 62913-2-4:2019, Table 3]
3.4
electric vehicle supply equipment
EVSE
EV supply equipment
equipment or a combination of equipment that provides dedicated specific 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.
3.5
charge charging 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 1 to entry: CSP is also abbreviated as EMSP in EU and NA.
Note 2 to entry: This note applies to the French language only.
3.6
charging station operator
CSO
charging point operator
CPO
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 CSO shall operate a roaming endpoint to achieve a roaming service.
Note 2 to entry: This note applies to the French language only.
3.7
e-mobility service provider
EMSP
party responsible for providing high-value services 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.
Note 1 to entry: Examples of high-value services include renting an EV, reservation of parking service, navigation
services and energy services which include charging station provider in relation with CSO.
[SOURCE: IEC TS SRD 62913-2-4:2019, Table 3]
3.8
home charging service provider
home-CSP
entity which has a contract with the EV user and can authorize an energy transfer session to
another CSP/CSO
3.9
visited charging station operator
visited-CSO
visited charging point operator
visited-CPO
CSO/CPO that the EV user visits for getting energy transfer service, which is not the EV user’s
home-CSP
3.10
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
3.11
roaming entity
entity which provides roaming service to EV user, including home-CSP, visited-CSO and
cleaning house (CH)
3.12
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 can be found depending on the region.
Note 2 to entry: This note applies to the French language only.
3.13
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.
3.14
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.
3.15
charging detail record
CDR
data package containing all necessary information within one unique identification which is
needed for billing or informing of/about an energy transfer session
3.16
charging session
collection of charging transactions at a charge point related only to the charging of an electric
car EV assigned to a specific customer in a specific time frame with a unique identifier
Note 1 to entry: The charging session is a subset of the service session.
3.17
service session
collection of services around a charge point mainly related to the charging of an electric car EV
assigned to a specific customer in a specific time frame with a unique identifier
3.18
charging transaction
smallest billable part of a charging session representing the transfer of energy in a specific time
frame
3.19
roaming endpoint
RE
entity containing all the related roaming functions
Note 1 to entry: This note applies to the French language only.
3.20
charging station
CS
physical equipment, consisting of one or more EVSEs managing the energy transfer to and from
Evs EV supply equipment, which manages the energy transfer to and from electric vehicles
Note 1 to entry: This note applies to the French language only.
3.21
energy transfer service
unit of continuous energy transfer between EVSE EV supply equipment and EV battery
3.22
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 figure; not all interface reference
points are plotted.
The information exchange of roaming focuses on actors between different home-CSPs, as well
as between a home-CSP and a visited-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
visited-CSO and the charging station. To implement the smart grid function, there could be
other optional communication connections. For example, the distribution system operator may
can send the smart charging profile directly to the home-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 EV supply equipment,
exchanges EV and EVSE EV supply equipment ID info, etc.
• EV supply equipment (EVSE EV supply equipment): for networked EVSE EV supply
equipment, this normally includes a controller for charging communication, which negotiates
and manages energy transfer between the EV and EVSE EV supply equipment, exchanges
EV and EVSE EV supply equipment ID info, etc.
• Charging station operator (CSO) Visited charging service provider (visited-CSO): the
visited-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 visited-CSO and home-CSP roles.
• Charge Home charging service provider (home-CSP): for roaming services, both home-CSP
and visited-CSO may can be involved through a roaming endpoint. For roaming between
home-CSPs, the visited home-CSP collects metering data and charging session information
from visited visited-CSO, then creates a service detail record (SDR), and forwards the SDR
to a home 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 hub service efficiency when there are many
service providers. Each clearing house may have its own system for facilitating information
exchange, billing and settlements.

NOTE I3 and I4 are defined in 4.3.
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 EV supply equipment and EV. The main functions include power
supply management and charging session management.
V supply equipment and visited-CSO. The functions supported
• I2: Interface between EVSE E
by this interface can include credential authentication, EVSE EV supply equipment 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 EV supply equipment 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 EV supply equipment 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 EV supply equipment.
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 home-
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 enhance user
experience and facilitate faster response times, the mixed mode allows for enables direct
communication between different various roaming endpoints to initiate and control manage
charging sessions. Similarly, other service modules are processed handled in a similar manner.
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 home-CSPs.
The choice of the mode can be determined based on business and technical considerations.
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' securityEnsure secure
TLS
communication over the network.
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 employ authentication mechanisms to identify the source of
messages (e.g. HMAC), in order to determine if the message is from a trustworthy source, such
as HMAC, to verify the origin of messages and ensure that they come from a trusted source.
Recommendations for specific security mechanisms in HTTP/HTTPS will often be taken from
existing works, including
– RFC 5246 8446, The Transport Layer Security (TLS) Protocol Version 1.2;3,
– AES, Advanced Encryption Standard, and
– 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 ass
...