scope:

This Recommendation describes signalling architecture and relevant interfaces of network attachment control functions (NACF) to support IP mobility in access networks considering interaction with signalling and functionality of mobility management and control functions (MMCF). Additional signalling requirements of NACF are identified to support IP mobility in next generation access (NGA) networks, with respect to the mechanism of IP address management and the signalling flows for mobility interface. This Recommendation addresses the signalling requirements and architecture of NACF for mobility service based on [ITU-T Y.2014]. Mobility signalling of other functions (such as MMCF and resource and admission control functions (RACF)) is out of scope of this Recommendation.