Authentication in a communication system

摘要

A communication system comprises two authentication entities. A first authentication entity (24) is for authentication of a registration request by a user (1). The first authentication entity is provided with a storage means for authentication data associated with the user. A second authentication entity (22) is for authentication of a further request by the user. The second authentication entity is provided with means for requesting data associated with the user from the first authentication entity. The second entity may also comprise means for storing user data communicated from the first entity. The provision of the user data from the first entity to the second entity may occur while the user is in an inactive state. The further request may comprise a session set-up request.