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Fig. 1
Integration with SIP servers in fixed networks
(FMC in the network layer)
Deployment of the function for linkage of mobile phones to fixed phone services
Introduction of new services assuming FMC
The trend of migration to the NGN, and the all-IP restructuring of existing networks into new, IP-based networks has recently been actively making progress among carriers. The background of this trend is the intensification of competition between carriers and a long-term drop in the communications fees. Both fixed and mobile communications carriers are accelerating their endeavors to apply IP networks in order to reduce the network operations costs and to enable the introduction of new services aimed at setting them apart from other communication carriers. Above all, the FMC is expected to be a major source of income for carriers because it offers the possibility of new value-added services based on the linkage of fixed and mobile telephones(Fig. 1).
Fig. 2
The network services of NGN are implemented via a platform called the IMS (IP Multimedia Subsystem), which is defined by 3GPP/3GPP2 (3rd Generation Partnership Projects). Introduction of the IMS makes it possible to provide IP-based multimedia services for cellular phone and WLAN (Wireless LAN) terminals, independently from the access networks. As the NGN provides services on an architecture common to both the fixed and mobile networks, the role of the software for use in its control system is more and more important.
As shown in the image of the NGN assembly in Fig. 2, the NGN is composed of security/QoS management functions and service delivery functions centered on the IMS platform. All of these form the service platform for the NGN and are positioned as the core functions of the NGN services.
