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Sharing Virtualized Network Functions (VNFs) among different slices in FifthGeneration (5G) is a potential strategy to simplify the system implementationand utilize 5G resources efficiently. In this paper, we propose asecurity-aware VNF sharing model for 5G networks. The proposed optimizationmodel satisfies the service requirements of various slices, enhances slicesecurity by isolating their critical VNFs, and enhances resource utilization ofthe underlying physical infrastructure. The model tries to systematicallydecide on sharing a particular VNF based on two groups of constraints; thefirst group of constraints is common assignment constraints used in theexisting literature. The second group is the novel security constraints that wepropose in this work; the maximum traffic allowed to be processed by the VNFand the exposure of the VNF to procedures sourced via untrusted users or accessnetworks. This sharing problem is formalized to allow for procedure-levelmodeling that satisfies the requirements of slice requests in 5G systems. Themodel is tested using standard VNFs and procedures of the 5G system rather thangeneric ones. The numerical results of the model show the benefits and costs ofapplying the security constraints along with the network performance in termsof different metrics.

A Security-aware Network Function Sharing Model for 5G Slicing