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Optimal Virtual Network Function Deployment for 5G Network Slicing in a Hybrid Cloud Infrastructure

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Document pages: 34 pages

Abstract: Network virtualization is a key enabler for 5G systems to support theexpected use cases of vertical markets. In this context, we study the jointoptimal deployment of Virtual Network Functions (VNFs) and allocation ofcomputational resources in a hybrid cloud infrastructure by taking therequirements of the 5G services and the characteristics of the cloudarchitecture into consideration. The resulting mixed-integer problem isreformulated as an integer linear problem, which can be solved by using astandard solver. Our results underline the advantages of a hybridinfrastructure over a standard centralized radio access network consisting onlyof a central cloud, and show that the proposed mechanism to deploy VNF chainsleads to high resource utilization efficiency and large gains in terms of thenumber of supported VNF chains. To deal with the computational complexity ofoptimizing a large number of clouds and VNF chains, we propose a simplelow-complexity heuristic that attempts to find a feasible VNF deploymentsolution with a limited number of functional splits. Numerical results indicatethat the performance of the proposed heuristic is close to the optimal one whenthe edge clouds are well dimensioned with respect to the computationalrequirements of the 5G services.

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