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Publication Detail
Hierarchical service providers on sliced infrastructure
n the 5G landscape, different Infrastructure and Service Providers can explore new business models by federating their resources and service offerings and providing their customers with the capability of instantiating end-to-end services across multiple technological resource domains. The service components can be located in separate geographical locations of one Provider or even outside of its own administrative borders. In order to facilitate the allocation of resources for the end-to-end services, each 5G Provider may take advantage from using complex software systems that perform the management, control, and orches-tration of the different resources that need to be allocated for the deployment of 5G Service Function Chains. Each of these systems, defined by european telecommunications standards institute (ETSI),∗ is usually referred to as MANO (Management and Orchestration of VNF) as it is able to deal with the tasks required to build Network services by combining multiple Virtual Network Functions (VNFs). In this paper, we consider a 5G Provider’s resource infrastructure consisting of two or more geographically separate offices (or business units) that seek to deploy network services composed of particular types of interconnected VNFs, whose elements location could potentially be anywhere in the distributed resource infrastructure—from the mobile edge to the core. Further-more, the physical resources utilized in each segment of the infrastructure can be managed by a particular MANO system that a business unit of that Provider is not willing to replace or update. Different MANO systems operating on dedicated segments of the distributed NFVI (for NFV Infrastructure) can inter-work according to a hierarchical topology, using north-south interfaces, in order to support the instantiation of more complex end-to-end services. More specifically, each south-bound interface of a MANO system will interact with the north-bound interface of its counterpart, just as it would do with a VIM (Virtual Infrastruc-ture Manager). This interaction will not have to be limited to just a single layer (ie, one upper-MANO and one lower-MANO) and might further be extended to a multi-layered stacked scenario where a recursive approach could simplify both the opera-tional management and the creation of new services—the most general case of this recursive architecture would be a tree—the Hierarchical Service Provider (HSP). To support the concept of slicing, we present an extension to the above HSP multi-MANO north-south interaction, with an implementation of a scenario based on existing MANO systems that have been devised and already utilized in the context of 5G. In order to support service provisioning over a slice-enabled distributed NFVI, mechanisms that enable the slicing of the whole end-to-end infrastructure—from the mobile edge to the core Data Center (DC)—including network, compute, and storage resources are required.
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