Five security feature groups are defined. Each of these feature groups meets certain threats and accomplishes certain security objectives:
Network access security (I): the set of security features that provide users with secure access to services, and which in particular protect against attacks on the (radio) access link.
Network domain security (II): the set of security features that enable nodes to securely exchange signalling data, user data (between AN and SN and within AN), and protect against attacks on the wireline network.
User domain security (III): the set of security features that secure access to mobile stations.
Application domain security (IV): the set of security features that enable applications in the user and in the provider domain to securely exchange messages.
Visibility and configurability of security (V): the set of features that enables the user to inform himself whether a security feature is in operation or not and whether the use and provision of services should depend on the security feature.