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The emergence of the next generation network (NGN), where ldquoAll IPrdquo and the aspects of heterogeneity of technologies and the convergence of the fix/mobile are liable to be deployed, has culminated in the shift of userpsilas needs as to the access of his service ldquoanywhererdquo, ldquoanytimerdquo and ldquoanyhowrdquo. Granted the importance of IP multimedia subsystem (IMS) as a service control platform for their NGN standards, the present study intends to focus on the information required in this new environment and contributes to the improvement of the home subscriber server (HSS) used to date. Seen from this vantage point, an IMS session must be able to adapt to the mobility and satisfy the SLA (service level agreement) of the user. The proposed solution is based on an informational structure able to answer these needs. Furthermore, the capacity to ensure the seamless mobility with the end-to-end quality of service (QoS) represents a vital criterion of success in the NGN use, the solution posited is based on a convergence of QoS plans namely: data plan, control plan and administration plan. In this paper, we propose to enrich the basic HSS with more decision-making information and we present some solutions that meet the needs for end-to-end QoS continuity.