ISO INTERNATIONAL STANDARD 15118-20 First edition 2022-04 Road vehicles Vehicle to grid communication interface Part 20: 2nd generation network layer and application layer requirements Vehicules routiers - Interface de communication entre vehicule et reseauélectrique Partie 20: Exigences des couches reseau et application de 2eme géneration Reference number IEC ISO 15118-20:2022(E) OSI @IS02022 IS0 15118-20:2022(E) COPYRIGHT PROTECTED DOCUMENT @ISO2022 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, withoutpriorwrittenpermission.Permission can berequestedfrom eitherIso at theaddress below orIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401 · Ch. de Blandonnet 8 CH-1214 Vernier, Geneva Phone: +4122 749 0111 Email: [email protected] Website: www.iso.org Published in Switzerland ii @ IS0 2022 - All rights reserved IS0 15118-20:2022(E) Contents Page Foreword. Introduction... .vi 1 Scope .. 2 Normative references ... 3 Terms and definitions.... .4 4 Abbreviated terms.... .12 5 Conventions... .15 5.1 Definition of osI based services. .15 5.2 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 7.2.1 Overview.... 7.2.2 Syntax of service primitives.. 18 7.3 Security concept... 19 7.3.1 Genera... 19 7.3.2 Certificate and key management .. 21 7.3.3 Number of root certificates and root validity... 35 7.3.4 Support and application of TLS .... .37 7.3.5 Firewall . 38 7.3.6 Protection of the cryptographic keys... .38 7.3.7 Random number generation ... 7.4 7.5 Data link layer.. .46 7.5.1 Data link layer security for WLAN .... .46 7.6 Network link layer.... 7.6.1 General.... 51 7.6.2 Applicable RFCs, limitations and protocol parameter settings .. ..51 7.6.3 7.7 Transport layer .. .54 7.7.1 Transmissioncontrolprotocol(TcP) .54 7.7.2 User datagram protocol (UDP) 7.7.3 Transport layer security (TLS) .56 7.8 V2G transfer protocol... .82 7.8.1 General information .... 7.8.2 Supported ports .. .83 7.8.3 Protocol data unit... .84 7.9 7.9.1 XML and efficient XML interchange (EXI).... .87 7.9.2 Message security... .90 7.10 Application layer... 115 7.10.1 SEcC discovery protocol... 115 8 8.1 General information and definitions.... 128 8.2 Protocol handshake definition.... 129 @ IS0 2022 - All rights reserved ii IS0 15118-20:2022(E) 8.2.1 Handshake sequence. ..129 8.2.2 Message definition supportedAppProtocolReq and supportedAppProtocolRes ....131 8.2.3 Semantics description supportedAppProtocol messages.... ..132 8.2.4 Message examples... ..133 8.3 V2G message definition... ....134 8.3.1 Overview... ..134 8.3.2 General.... ..135 8.3.3 Header definition.. 8.3.4 .Request and response definitions.... 8.3.5 Complex data types.... ..240 8.4 Service selection... ....361 8.4.1 General.. ..361. 8.4.2 General description of configuration parameters ..362 8.4.3 Selection of service and service parameters... ...363 8.5 V2G communication timing.... 8.5.1 Overview .. ..373 8.5.2 Common. ..373 8.5.3 DC service..... 8.5.4 Message sequence and communication session... .374 8.5.5 Session setup and readyto charge... ..381 8.5.6 V2G message synchronization for AC and DC with IEC 61851-1 signalling .. 387 8.5.7 V2G message synchronization with IEC 61980-2 signalling for WPT... ..394 8.6 Message sequencing and error handling.. .394 8.6.1 8.6.2 Basic definitions for error handling... ..395 8.6.3 ResponseCode handling.... ..395 8.6.4 Request-response message sequence requirements.. 8.6.5 Multiplexed communication ... ..434 8.6.6 Message sequence diagrams.. .437 Annex A (normative) Schema definition... ..442 Annex B (normative)