论文标题
多维通用生成功能对多租户服务功能链接基础架构的可用性评估
Availability Evaluation of Multi-tenant Service Function Chaining Infrastructures by Multidimensional Universal Generating Function
论文作者
论文摘要
网络功能虚拟化（NFV）范式已通过加快新颖网络服务的配置和组成来设计为下一代网络基础架构的推动者。后者是通过虚拟化网络函数链实现的，该过程称为服务功能链接。在本文中，我们评估了多租户SFC基础架构的可用性，其中每个网络功能均被建模为多状态系统，并在不同的独立租户之间共享。为此，我们提出了一种通用生成函数（UGF）方法，可适当扩展以处理性能向量，我们称为多维UGF。这种新颖的方法在现实的多租户电信网络方案中得到了验证，其中服务链由通过NFV实现的IP多媒体子系统的网络元素组成。提出了对这种示例性系统的稳态可用性评估，并解决了冗余优化问题，因此提供SFC基础架构，该基础架构可以最大程度地减少部署成本，同时尊重给定的可用性要求。
The Network Function Virtualization (NFV) paradigm has been devised as an enabler of next generation network infrastructures by speeding up the provisioning and the composition of novel network services. The latter are implemented via a chain of virtualized network functions, a process known as Service Function Chaining. In this paper, we evaluate the availability of multi-tenant SFC infrastructures, where every network function is modeled as a multi-state system and is shared among different and independent tenants. To this aim, we propose a Universal Generating Function (UGF) approach, suitably extended to handle performance vectors, that we call Multidimensional UGF. This novel methodology is validated in a realistic multi-tenant telecommunication network scenario, where the service chain is composed by the network elements of an IP Multimedia Subsystem implemented via NFV. A steady-state availability evaluation of such an exemplary system is presented and a redundancy optimization problem is solved, so providing the SFC infrastructure which minimizes deployment cost while respecting a given availability requirement.
