In the week of May 19th ~ 23rd 2025, global industry and academic experts in the area of optical communication gathered in Castelldefels (Barcelona), Spain to discuss F5G-Advanced network architecture and future roadmap to F6G, and identify potential open-source implementation driven by TFS and OSL to develop PoCs of the F5G-Advanced architectures. The groups involved were ETSI SDG OSL (Software Development Group OpenSlice), SDG TFS (Software Development Group TeraFlowSDN) and ISG F5G. CTTC hosted all these meetings in its headquarters.

During this week, an open joint session between SDG OSL, SDG TFS and ISG F5G was held for the first time. The intelligent network management & control and the automatic service provisioning of the F5G Advanced networks, which contain multiple fixed network segments, becomes the common interests of these three groups.

The ETSI SDG OSL works on an open-source, service-based Operations Support System that brokers Network Slice / Network-as-a-Service offerings, provides catalogues, intent-based ordering, lifecycle management, and integrates with ETSI NFV, OSM, ZSM and TM-Forum Open APIs.

The ETSI SDG TFS develops a cloud-native SDN controller built from micro-services to automate, secure and optimise packet-optical transport networks and future 6G infrastructures, with advanced telemetry, closed-loop automation and multi-domain slice control.

ISG F5G studies and develops the generations of the fixed network fostering the evolution to a “fibre to everywhere and everything” ecosystem that enables new and enhanced services leveraging, in a framework of growing network capabilities, better performance, intelligent E2E management, network security and enhanced energy efficiency.

During the joint session, experts from SDG OSL, SDG TFS and ISG F5G shared their standard works with each other:

• Olivier Ferveur (Chair of ISG F5G) from POST Luxembourg introduced the standard work in ISG F5G, including its scope, working methods, publications, and the evolution from F5G to F5G Advanced. He also showed the standards in ISG F5G which are related to the intelligent network management, control and operation.

• Christos Tranoris (Chair of SDG OSL) from University of Patras introduced a deep dive into the OpenSlice architecture and Release 2 roadmap, which includes intent-based slice ordering, CAMARA Quality-on-Demand (QoD) exposure, policy-driven closed-loop assurance.

• Ricard Vilalta (Chair of SDG TFS) from CTTC introduced TeraFlowSDN Release 5: cloud-native SDN control-plane, Transport-Slice Controller, integrated security enforcement, and multi-domain BGP-LS/intent interfaces. He showed how TFS aligns with IETF CCAMP/TEAS and provides north-bound IETF slices.

• Raul Muñoz (PoC team leader) from CTTC introduced the F5G PoC on "F5G-Advanced access and transport network with autonomous service management enabling End-to-end CAMARA QoD Services for Cloud AR/VR Gaming", on behalf of the PoC team members from CTTC, Huawei, Telefonica and Telenor. This PoC focused on the development of a standards-based and open-source Network-as-a-Service (NaaS) platform for end-to-end service delivery and network automation, using an immersive Augmented Reality/Virtual Reality (AR/VR) Gaming Service for Remote Players as a practical application of the F5G Advanced (F5G-A) architecture. The platform demonstrated end-to-end QoD capabilities, incorporating application-flow classification and differentiation.

It is expected that SDG OSL, SDG TFS and ISG F5G will cooperate with each other on the research, software development and PoC demonstration, and standardization on end-to-end optical network management, control and service orchestration.