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In order to cope with the ever-increasing traffic demands and stringent latency constraints, next generation, i.e., sixth generation (6G) networks, are expected to leverage Network Function Virtualization (NFV) as an enabler for enhanced network flexibility. In such a setup, in addition to the traditional problems of user association and traffic routing, Virtual Network Function (VNF) placement needs to be jointly considered. To that end, in this paper, we focus on the joint network and computational resource allocation, targeting low network power consumption while satisfying the Service Function Chain (SFC), throughput, and delay requirements. Unlike the State-of-the-Art (SoA), we also take into account the Access Network (AN), while formulating the problem as a general Mixed Integer Linear Program (MILP). Due to the high complexity of the proposed optimal solution, we also propose a low-complexity energy-efficient resource allocation algorithm, which was shown to significantly outperform the SoA, by achieving up to 78% of the optimal energy efficiency with up to 742 times lower complexity. Finally, we describe an Orchestration Framework for the automated orchestration of vertical-driven services in Network Slices and describe how it encompasses the proposed algorithm towards optimized provisioning of heterogeneous computation and network resources across multiple network segments.

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The 5GCroCo project has been working on aspects around vehicular communications taking into consideration different perspectives such as i) infrastructures with multiple administrative domains where to achieve the most efficient service deployment, and ii) the automotive services themselves for providing advanced functionalities to vehicular users. This article aims to present the results collected on top of the 5GCroCo Barcelona small-scale trial infrastructure during the experimental phases. In particular, the goal of the conducted experiments was to evaluate how the proposed orchestration solution works on top of a multidomain infrastructure. Composite network slices, i.e., composed of multiple slice subnets and related network services (NSs) have been orchestrated and managed across the Barcelona multidomain infrastructure and the different deployment iterations have been monitored to validate whether the Key Performance Indicators (KPIs) selected were accomplished.