ISO/IEC INTERNATIONAL STANDARD 21558-2 First edition 2023-01 Telecommunications and information exchange between systems Future network architecture Part 2: Proxy model-based quality of service Telécommunications et échange d'informations entre systemes - Architectureduréseaudufutur Partie 2:Qualité de service basée sur un modele de proxy Referencenumber IS0/IEC21558-2:2023(E) ISO @IS0/IEC2023 IS0/IEC21558-2:2023(E) COPYRIGHTPROTECTEDDOCUMENT IS0/IEC2023 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 anyform or byanymeans, electronic or mechanical, including photocopying,or posting on the internet or an intranet, without prior written permission. Permission can be requested from either IsO at the address below orIso'smemberbodyinthecountryoftherequester. ISO copyright office CP 401:Ch.de Blandonnet8 CH-1214Vernier,Geneva Phone: +4122 749 01 11 Email: copyright@iso.org Website: www.iso.org Published inSwitzerland ii @IS0/IEC2023-All rightsreserved