Value Added Services in the Evolving Multimedia Communication Network

Abstract

With the introduction of IMS based multimedia communication services, the need rises for a framework similar to Intelligent network (IN). The IN standard is used for augmenting Circuit switched (CS) networks like PSTN and PLMN (GSM, 3G). The IN standard is grafted on CS network paradigms and principles and is, in its native form, not suitable for IP communication networks like IMS. Within IMS, communication services are realized through Application servers (AS). AS’s are connected to IMS core network in a manner that resembles, to some extent, Value added services (VAS) for CS networks. The combination of IMS core network and IMS Application servers provides network architecture for ‘basic multimedia communication’, including, but not limited to, telephony, video calling and messaging. In order to go beyond this set of basic communication services, the concept of VAS is equally needed in IMS. But in a different way! At the same time, network operators want to safeguard their investment in VAS in the CS network. In addition, operators require ‘service parity’ when introducing IMS. Hence, the introduction of VAS in the IMS network shall comprise a level of backwards compatibility. The introduction, and further development of, VAS in IMS gives rise to interesting network architecture, allowing for seamless integration of CS network and IMS network, augmenting the communication services, such as telephony, as is appropriate for the class of network used by the served subscriber. Protocols and procedures will be different, but fundamental service principles remain the same!