Summary

Recommendation ITU-T Y.2111 specifies the functional architecture and requirements for the resource and admission control functions (RACF) in next generation networks (NGN), which may involve a variety of access and core transport technologies and multiple domains. The RACF provides real‑time application-driven and policy-based transport resource management in support of end‑to‑end quality of service (QoS), gate control, network address translation, and traversal of remote network address translators. The RACF is not service-specific. Services can make use of RACF whether the IP multimedia subsystem is involved or not.

In particular, this edition of Recommendation ITU-T Y.2111 includes extensions to the 2008 edition to address issues related to the interaction with 3GPP policy control functionalities, resource and admission control between NGNs and RACF-unaware IP networks, wholesale, time-shifted TV services, QoS downgrading, mobility, resource and admission control based on user subscription profile, support of deep packet inspection (DPI), communication between RACF and management of performance measurement (MPM), policy-based charging control, and IPTV service by invitation.