Summary

Recommendation ITU-T Y.3113 specifies requirements and a framework for effective and efficient solutions for latency guarantee and cooperation among heterogeneous quality of service (QoS) domains.

For a latency guarantee in multi-domain large-scale networks, it is necessary to clarify how the numerous data-plane functional entities should be arranged and operate in conjunction with each other. In order for the solution to be both effective and efficient, selecting an appropriate traffic granularity for network treatment is essential. The variety of granularity of flow aggregates (FAs), between flow and class, should be taken into consideration.

On the Internet or the IMT-2020 network, there are inevitably multiple domains with possibly different QoS architectures. Even with multiple heterogeneous domains, there should be an underlying unified resource reservation and admission control functions, while the data plane functions should be based on FAs and appropriate regulations in the middle of an end-to-end path.