Overview
ISO/IEC 21559-2:2023 - "Telecommunications and information exchange between systems - Future network protocols and mechanisms - Part 2: Proxy model‑based quality of service" describes a proxy‑model approach to Quality of Service (FNQoS) for Future Network (FN) environments. The standard defines protocol mechanisms that enable synchronous interactions between intelligent proxies (FNProxies), supporting both a two‑proxy Basic FNQoS System (BFS) and multi‑proxy Synthetic FNQoS System (SFS). It complements ISO/IEC 21558‑2 and relates to ISO/IEC TR 29181‑8.
Key technical topics and requirements
- FNProxy concept and engines: Specifies three core engines inside an FNProxy - perception, negotiation and execution - to support autonomous, harmonized QoS behavior.
- Interaction models: Defines Bi‑directional Service (Bi‑S) interactions for both pairwise (BFS) and multi‑proxy (SFS) configurations.
- Data and protocol units:
- FPDU (FNProxy Protocol Data Unit) - the data unit exchanged between FNProxies.
- BFSP / SFSP - protocol definitions and message semantics/timing for BFS and SFS respectively.
- Topology and linking:
- FIB (FNProxy Interaction Bridge) - logical linking paths for proxy interactions in an SFS.
- FLM (FNProxy Link Mode) - link templates to standardize linking, negotiation and transition behavior; Annex D lists example FLMs.
- Strategies and procedures:
- FNProxy Strategy (FNPS) and FSB (FNProxy Strategy Base) - predefined response sets and storage for strategy schemes.
- Service transition rules and conditions for when an FNProxy must hand off requirements it cannot serve.
- Protocol behavior and modeling:
- UML usage for system modeling, sequence diagrams for SFS procedures, and procedures described as ordered interactions.
- Supplementary material: Informative annexes include quantitative harmonization methods, C++ Bi‑S examples, methods for domains, and guidance to avoid infinite transitions.
Note: the standard calls out possible patent claims and recommends use of Artificial Intelligence Enabled Networking (AIEN) for FN development.
Practical applications and who uses it
- Network architects and engineers designing Future Network QoS frameworks that rely on autonomous, proxy‑based coordination.
- Vendors building FNProxy software/hardware implementing perception, negotiation and execution engines.
- System integrators and service providers who need standardized mechanisms for inter‑proxy QoS negotiation, service transition and multi‑domain coordination.
- Researchers and developers working on AIEN, semantic networking, and advanced QoS harmonization strategies.
- Standards bodies and implementers who need interoperable FPDU/BFSP/SFSP definitions and examples (including Annex B C++ sample).
Related standards
- ISO/IEC 21558‑2 (Proxy Model based Quality of Service - architecture) - normative reference.
- ISO/IEC TR 29181‑8 - related Future Network proxy concepts and interoperability guidance.
Keywords: ISO/IEC 21559-2:2023, FNProxy, FNQoS, Future Network, proxy model, quality of service, BFS, SFS, FPDU, FIB, FLM, Bi‑S, AIEN.