From Network Sharing to Multi-tenancy: The 5G Network Slice Broker

TL;DR

This paper reviews the evolution of network sharing to multi-tenancy in 5G, introducing the 5G Network Slice Broker to enable dynamic resource leasing and discussing standardization efforts for advanced network slicing.

Contribution

It presents the concept of the 5G Network Slice Broker and analyzes recent standardization efforts for flexible, multi-tenant 5G network slicing solutions.

Findings

Introduction of the 5G Network Slice Broker concept

Analysis of 3GPP standard evolution for multi-tenancy

Discussion of open issues in network slicing standardization

Abstract

The ever-increasing traffic demand is pushing network operators to find new cost-efficient solutions towards the deployment of future 5G mobile networks. The network sharing paradigm was explored in the past and partially deployed. Nowadays, advanced mobile network multi-tenancy approaches are increasingly gaining momentum paving the way towards further decreasing Capital Expenditures and Operational Expenditures (CAPEX/OPEX) costs, while enabling new business opportunities. This paper provides an overview of the 3GPP standard evolution from network sharing principles, mechanisms and architectures to future on-demand multi-tenant systems. In particular, it introduces the concept of the 5G Network Slice Broker in 5G systems, which enables mobile virtual network operators, over-the-top providers and industry vertical market players to request and lease resources from infrastructure providers dynamically via signaling means. Finally, it reviews the latest standardization efforts considering remaining open issues for enabling advanced network slicing solutions taking into account the allocation of virtualized network functions based on ETSI NFV, the introduction of shared network functions and flexible service chaining.