Required Information for Device Management Quality in IP Multimedia Subsystem

The third generation network which is vigorous nowadays will be followed by an all-IP infrastructure referred to as Next Generation Networks (NGN) in the near future. More specifically, the IP Multimedia Subsystem (IMS) is the only standardized way to offer IP based services that are enabled by one common core and all types of access networks and devices. The heterogeneity and mobility of the IMS raises many challenges as to the quality and pertinence of information required for device management. Therefore, we have to focus on the information required in this new environment and propose to evolve todaypsilas Home Subscriber Server (HSS) and Domain Name System (DNS). Indeed, an IMS session must be adaptable to all mobility and meet the Service Level Agreement (SLA) of the user. The proposed solution is based on the user data model and the pertinence of information able to meet the QoS needs of the user in any time. Moreover, a solution which can allow a subscriber to register with one or more operator(s) is also presented.