Security requirements for multi-operator virtualized network and service orchestration for 5G

Fifth generation mobile communication (5G) networks will support new business and service models. A particular model of business and technical interest is multi-operator service orchestration and delivery, where service chains are created dynamically with coordination across multiple ad- ministrative domains. In such a scenario, resource sharing among operators is expected to be enabled by emerging network softwarization technologies such as Software-De_ned Networking (SDN) and Network Function Virtualization (NFV). On top of the inherent security issues of network softwarization, the complex relationships between operators add a unique dimension to the fun- damental requirements for 5G networks. It is a key objective for network operators to identify new threats and security issues before deploying novel methods for service orchestration and delivery. This chapter elaborates on new security challenges posed by multi-operator service orchestration and delivery as de_ned by the H2020 5G-PPP 5G Exchange project. We will re- visit current standards and recommendations from ITU-T and ETSI under the scope of SDN and NFV. In addition, we will present a method for threat analysis as well as gaps between requirements and current security schemes and standards, opening new research directions.