 2009. 16 IEEE 802.1Q - 2005, Virtual Bridged Local Area Networks, May 2006. 17 IEEE 802.1ad - 2005, Virtual Bridged Local Area Networks - Amendment 4: Provider Bridges, May 2006. 18 IEEE 802.1ah - 2008, Virtual Bridged Local 14 Area Networks - Amendment 6: Provider Backbone Bridges, August 2008. 19 IETF RFC 2917, A Core MPLS IP VPN Architecture, September 2000. 20 ITU-T Recommendation Y.2175, Centralized RACF Architecture for MPLS Core Networks, November 2008. 21 ITU-T Recommendation Y.2174, Distributed RACF Architecture for MPLS Networks, June 2008. 22 ITU-T Recommendation Y.2772, Mechanisms for the Network Elements with Support of Deep Packet Inspection, April 2016. 23 ITU-T Recommendation Y.2773, Performance Models and Metrics for Deep Packet Inspection, February 2017. 3 QoS in NGN and Future Networks 24 A. Galis, H. Abramowicz, Brunner, M., et al., Management and Service-aware Networking Architectures (MANA) for Future Internet, Communications and Networking in China - ChinaCOM 2009. 25 ITU-T Recommendation Y.3011, Framework of Network Virtualization for Future Networks, January 2012. 26 ITU-T Recommendation Y.3012, Requirements of Network Virtualization for Future Networks, April 2014. 27 ITU-T Recommendation Y.3302, Functional Architecture of Software-defined Networking, January 2017. 28 IETF RFC 7149, Software-Defined Networking: A Perspective from within a Service Provider Environment, March 2014. 29 IRTF RFC 7426, Software-Defined Networking (SDN): Layers and Architecture Terminology, January 2015. 30 Karakus, M. and Durresi, A. (2017). Quality of Service (QoS) in software defined networking (SDN): A Survey. Journal of Network and Computer Applications 80. 31 Telecommunication Development Sector, ITU, Strategies for the Deployment of NGN in a Broadband Environment - Regulatory and Economic Aspects, March 2013. QoS for Fixed Ultra-Broadband Quality of service is equally important for both main types of access networks, fixed and mobile. Both have converged on the all-IP principles, meaning that the user 