Service enhancements for the converged communication network

The service layer in IMS is undergoing substantial architectural enhancement. IMS communication services, such as voice, video, messaging (incl. chat mode), are facilitated through designated and standardized SIP application servers. Traditionally, operators have a need for enhancing the service experience for their end-users [6]. These enhancements are implemented in the actual SIP-AS´s as well as in separate application servers. Different methods are applied for connecting the separate application servers to said SIP-AS´s. The advancements in service layer architecture are used also for creating services whereby a multitude of devices, using different communication protocols, are combined into a meta service. Smartphone, tablet and TV form, when connected to the IMS network, an integrated communication service. The present paper explores these advances in service layer architecture and sets out recommendations for further work.