Service composition in IMS: A location based service example

The IP Multimedia Subsystem (IMS) is a standardized architectural framework for the provision of multimedia services over a packet based next generation network (NGN). We present an overview of IMS, with emphasis on use of IMS application servers and enablers for service delivery, and show how an innovative prototype service can be designed and developed based on principles of service composition and reuse of common service enablers and content resources. The prototype service, dubbed LocalNote, may be described as a location triggered messaging service enhanced with presence. It allows the originating user to create a location-based ldquosticky noterdquo in form of a SMS message, to be delivered to the recipient user(s) upon entering a designated geographical area. The service is based on a new application server in IMS and it also makes use of the presence, location, and location context enablers, as well as a map content server.