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- Relationships Among NGN, Softswitch and IMS - ztecommunications.
It can also provide C5 services by connecting different terminals to core service networks via data access. There are two structures to construct Softswitch networks. One is temporarily named as integrated Softswitch which accesses different wireline users, including narrowband and broadband users. The other consists of narrowband and broadband Softswitch, where Media Gateway Controller MGC and SIP server, which are responsible for the access and control of narrowband and broadband users respectively, are cooperatively used for Softswitch services.
Softswitch is a preliminary stage of the NGN and it aims to the services related to wireline users. However, its development should provide room for future requirements of NGN. Therefore, the narrowband Softswitch can be deployed to meet the demands of the market. It is recommended that integrated Softswitch, rather than broadband Softswitch, should be used for the network construction, although there are requirements for broadband services.
It seems that broadband Softswitch supports mobility of these terminals and meets some requirements of IP voice, and the SIP server can evolve into IMS according to its standards. However, there is a big gap between the Softswitch and IMS. Specifically, the broadband Softswitch has no centralized database setting and management, and processing the user and service data via the local server.
The core structure, network element functions, interfaces, and procedures are defined in R5. Presently the R5 and R6 are on hold.
Overview of the Next Generation Network | NTT Technical Review
It can support fixed access. After the 3G licenses have been granted, each operator has the possibility to be a full-service operator. A traditional fixed network operator soon will probably build an IMS network under the market competition, even if he has established a R4 3G network with services. At the beginning, this IMS network can only accommodate 3G users, but its network protocols should consider the access of wireline broadband data users. In nature, it is better to plan the two user access requirements as a whole, and construct a convergence network at the very beginning.
However, there are differences in service time and service type between wireline and wireless user accesses, which possibly makes the service networks apart. The IMS is also a generalized service platform for future multimedia applications, such as presence, message, conference, Push-to-talk over Cellular PoC , and other typical services.
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