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1                                                Core network aspects


                                                      Appendix I


                                           Architecture reference model
                             (This appendix does not form an integral part of this Recommendation)


            The architecture reference models are explained considering both the non-roaming case and the roaming
            case. The aggregated reference points, m1 through to m4 are used to explain the relationship among UE, A-
            MMCF and C-MMCF in home and visited networks. m1 is the interface between A-MMCF and C-MMCF, m2
            is the interface between UE and A-MMCF, m3 is the interface between UE and C-MMCF, and m4 is the
            interface  between  the  two  C-MMCF  in  home  and  visited  networks.  The  MMCF  is  composed  of  several
            functional  entities  and  the  detailed  reference  points  between  those  functional  entities  and  the  other
            functional entities in NGN are defined in clause 6.5.


            I.1     Non-roaming architecture and scenarios
            The non-roaming architecture in NGN can have two different architectures according to the type of mobility
            management protocols supported, host-based or network-based mobility management protocols.
            Figure  I.1  shows  a  non-roaming  architecture  when  a  network-based  mobility  management  protocol  is
            considered while using an interface between A-MMCF and C-MMCF.



                                                      Service control functions



                                            NACF      A-RACF                C-RACF



                                                A-MMCF                      C-MMCF
                                                                   m1



                                UE        Access transport functions   Core transport functions
                                                                                 Y.2018(09)_FI.1


                          Figure I.1 – Non-roaming architecture for network-based mobility using m1


            Figure I.2 shows a non-roaming architecture when a host-based mobility management protocol is considered
            while having a direct relationship between UE and C-MMCF without involving A-MMCF.


























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