Recommendation Y.2111, a new standard emerging from the July NGN-GSI meetings addresses
a key area of concern in NGN, the ability to offer end-to-end QoS. Crucially it
also addresses the need to be able to differentiate multiple services running
over the same network.
Recommendation deals with resource and admission control functions (RACF) which
will help enable operators to guarantee end-to-end quality for multimedia
services in NGN, for example VoIP and IPTV. Key to the approach is the ability
for an operator to specify rules to specific communication types in order that
they can better allocate network resources.
IP networks today operating under a best-effort system, network congestion can
significantly undermine the quality and reliability of more advanced multimedia
applications. RACF meets the demand for more intelligent control of
packet-based network infrastructures.
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.