Availability is a key service metric when deploying service function chains (SFCs) over network slices in 5G networks. We study the problem of determining the composition of a slice for a service function chain and the mapping of the slice to the physical transport network in a way that guarantees availability of the SFC while minimizing cost. To improve the availability, we design a slice that provides multiple paths (possibly with non-disjoint routing over the physical infrastructure) for hosting SFCs, and we determine the appropriate dimensioning of bandwidth on each path. Our simulation results show the effectiveness of our approach in terms of the cost of establishing the SFC and the SFC acceptance ratio.

中文翻译：

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5G传输网络中服务功能链的可用性保证切片组成

在5G网络中的网络切片上部署服务功能链（SFC）时，可用性是关键的服务指标。我们研究确定服务功能链的切片组成以及将切片映射到物理传输网络的问题，该方法可以在最小化成本的同时保证SFC的可用性。为了提高可用性，我们设计了一个切片，该切片为托管SFC提供了多条路径（可能在物理基础结构上具有不间断的路由），并确定每条路径上带宽的适当大小。我们的仿真结果显示了我们在建立SFC的成本和SFC接受率方面的有效性。