  Users may already have some perception of provided security based on
experience with earlier generations. To maintain the stability and coherent
integration of 5G services, it is imperative that security and privacy features
prevalent in earlier generations are also present in 5G. However, it is not
sufficient just to provide the same security features as in the legacy systems
due to the new threat model introduced by the integration of new technologies
like SDN, virtualization and SBA. 5G systems are expected to be more
service-oriented. This suggests there will be an additional emphasis on
security and privacy requirements that spawn from the new dimension of
service-oriented security architecture.
