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.