From Network Sharing to Multi-tenancy: The 5G Network Slice Broker (1605.01201v1)

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.

• The paper demonstrates how the 5G Network Slice Broker dynamically allocates network resources, realizing significant CAPEX and OPEX savings.
• It integrates with 3GPP standards by leveraging NFV and dedicated core networks to enhance network sharing and operational agility.
• The study presents practical scenarios where network slicing improves service quality and enables collaborative multi-operator environments.

Overview of 5G Network Slice Broker for Multi-Tenancy

This paper by Samdanis, Costa-Perez, and Sciancalepore addresses the challenges posed by increasing mobile data traffic demands through network sharing and multi-tenancy in 5G systems. It proposes the 5G Network Slice Broker as an advanced interface to enable dynamic and efficient resource allocation for various market players, including Mobile Virtual Network Operators (MVNOs), Over-the-Top (OTT) providers, and vertical industries.

The authors begin by contextualizing the economic imperatives behind network sharing. They highlight how traditional ownership models struggle under the weight of rapidly increasing operational and infrastructure costs. Network sharing can alleviate these financial pressures, potentially reclaiming up to 20% of operational expenses and halving infrastructure costs in key areas such as the Radio Access Network (RAN).

A central component of the proposed architecture is the 5G Network Slice Broker. This broker facilitates a marketplace-like environment where different stakeholders can dynamically request network resources without direct human intermediation. It enhances the 3GPP standard network sharing architecture by integrating with the Service Exposure Capability Function (SCEF) to streamline the allocation and management of network slices. Through this broker, different network participants can share resources, optimizing usage and cost without compromising individual service quality.

The paper explores several compelling scenarios where network sharing offers strategic advantages. These include multi-operator core networks sharing a common RAN or spectrum, operator collaborations to broaden coverage, and common spectrum sharing for operational efficiency. Through these scenarios, the authors demonstrate the potential for network operators to transition from static, ownership-driven models toward flexible, demand-oriented paradigms.

Another vital topic discussed is the incorporation of virtual operators and vertical industries into the 3GPP ecosystem. This inclusion relies heavily on extending current management architectures to support dynamic resource allocation, a process facilitated by the Network Slice Broker. By enabling exposure of network service capabilities to third parties through enhanced interfaces, the proposed architecture ensures network resources can be allocated with unprecedented precision and efficiency.

Numerical results underscore the potential for significant economic efficiencies: network sharing and slicing can contribute to notable CAPEX and OPEX reductions and offer better returns on investment. Simultaneously, this architectural approach allows for strategic alignment with business needs, such as service differentiation and market positioning.

The paper does not merely rest on theory but extends its implications towards practical application. By enhancing the 3GPP's existing network sharing and standardization framework with novel concepts such as Network Function Virtualization (NFV) and Dedicated Core Networks (DCN), the authors suggest a pathway toward full multi-tenancy. The integration of advanced capabilities, including user/control plane separation, service chaining, and mobile edge computing, further attests to the future readiness of the proposed system to handle complex network demands.

In conclusion, the paper presents a detailed examination of the potential 5G infrastructure evolution, which could pave the way for more agile, responsive, and economically viable mobile networks. The 5G Network Slice Broker posits a transformative approach that aligns with emerging technological trends, suggesting significant improvements in network management, operational efficiency, and market adaptability. As network demands grow and diversify, such innovations are crucial for maintaining the competitive edge and service quality expected in next-generation mobile networks.