Design Framework and Architecture of Unified Presence Service

Unified Communication and Collaboration (UCC) system is the converging service of all communications. IMS (IP Multimedia Subsystem) is expected to be a core service for both Internet and mobile phones. Hence, UCC certainly involves with IMS to provide a future service to both world. Presence service is crucial component in UCC system. It provides notifications and presence information of users and any devices to a particular user who requires this service. However, a traditional presence service system is inadequate to satisfy rich features services of UCC. Since users have a large number of presence information sent by many services in system, how a system gives all presence information a user appropriately. This scenario is so called ` massive PI´. There are several challenging issues on this topic. In this paper, we have proposed `Unified Presence Service´ (or UPS) to deliver a massive PI in UCC environment. A system framework and architecture of UPS is presented. In this design framework, all related signals and components are illustrated, its description and functions are presented. We have shown some sample scenarios to demonstrate its benefits and advantages which cannot be delivered by those previous works. We believe that this service framework is significant for future services in a convergence world like UCC.