Page 428 - 5G Basics - Core Network Aspects
P. 428

1                                                Core network aspects


            SSP         Service Switching Point

            UMA         Unlicensed Mobile Access
            UMTS        Universal Mobile Telecommunication System

            UTRAN       UMTS Terrestrial Radio Access Network
            VCC         Voice Call Continuity

            VoIP        Voice over IP
            VPMN        Virtual Private Mobile Network
            VPN         Virtual Private Network

            WAN         Wide Area Network
            W-CDMA      Wideband CDMA

            WiMAX       World Interoperability for Microwave Access
            WLAN        Wireless LAN
            xDSL        Any of the various types of DSL


            5       Conventions


            5.1     Usage of the term "IMS"
            The term "IMS" without any prefix as used in this Recommendation refers to the IMS concept in [ITU-T
            Y.2021] and as updated in the most recent versions of [ITU-T Q.1741] and [ITU-T Q.1742].


            6       Objectives of FMC

            6.1     General objectives of FMC
            The following points provide the general objectives for FMC:
            •       Seamless service operation from the end user perspective across heterogeneous fixed networks
                    (i.e., PSTN, ISDN, PSDN, WAN/LAN/CATV, etc.) and mobile networks (i.e., GSM, CDMA2000, WiMAX,
                    etc.), subject to any limitations imposed by the characteristics of the particular access technology
                    being used.

            •       Seamless service provisioning from the service provider's perspective across heterogeneous fixed
                    and mobile networks, subject to any limitations imposed by the characteristics of the particular
                    access technology being used.
            •       Generalized Mobility defined in [ITU-T Y.2001] is supported in FMC (i.e., terminal device mobility,
                    user mobility and session mobility). For a given scenario, different levels of mobility may be needed.
            •       Ubiquity of service availability where the end users can enjoy virtually any application, from any
                    location, on any terminal device subject to any limitations imposed by the characteristics of the
                    particular access technologies and terminal devices being used, given that the service has been
                    subscribed.
            •       Support of multiple user identifier and authentication/authorization mechanisms.

            6.2     Objectives from different perspectives

            The following subclauses provide more specific objectives for FMC:









            418
   423   424   425   426   427   428   429   430   431   432   433