ITU-T Y.2111 PDF

This Recommendation specifies the resource and admission control functions (RACF) in support of end-to-end quality of service (QoS) and network border control (at access-core and inter-domain boundaries) in next generation networks (NGNs). The RACF is aimed at providing real-time application-driven and policy-based transport resource management for a wide range of services and for a variety of transport technologies (e.g., fixed or mobile). Services can make use of RACF whether the IP multimedia subsystem (IMS) is involved or not. This Recommendation defines the related requirements and functional architecture covering aspects such as resource reservation, admission control and gate control, network address port translation (NAPT) and firewall control, and network address translator (NAT) traversal. This Recommendation defines the related requirements and functional architecture covering aspects such as interactions 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.

It also defines the reference points between different functional entities and the pertinent stage 2 requirements and describes the procedures for QoS-related transport resource control, NAPT control, NAT traversal, inter-operator communication including other NGN and non-NGN providers, mobility support, performance measurement support, and policy-based charging control support.

The pertinent protocol specifications are described in separate Recommendations. End-to-end information flows for representative applications, such as VoIP, bulk data transfer and video on demand, are for further study.

Note that network management functionality is outside the scope of this Recommendation.

Administrations may require operators and service providers to take into account national regulatory and national policy requirements in implementing this Recommendation.