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 2022
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii
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
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

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 th
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