Network Slicing for 5G with SDN/NFV: Concepts, Architectures and Challenges (1703.04676v2)

Abstract: The fifth generation of mobile communications is anticipated to open up innovation opportunities for new industries such as vertical markets. However, these verticals originate myriad use cases with diverging requirements that future 5G networks have to efficiently support. Network slicing may be a natural solution to simultaneously accommodate over a common network infrastructure the wide range of services that vertical-specific use cases will demand. In this article, we present the network slicing concept, with a particular focus on its application to 5G systems. We start by summarizing the key aspects that enable the realization of so-called network slices. Then, we give a brief overview on the SDN architecture proposed by the ONF and show that it provides tools to support slicing. We argue that although such architecture paves the way for network slicing implementation, it lacks some essential capabilities that can be supplied by NFV. Hence, we analyze a proposal from the ETSI to incorporate the capabilities of SDN into the NFV architecture. Additionally, we present an example scenario that combines SDN and NFV technologies to address the realization of network slices. Finally, we summarize the open research issues with the purpose of motivating new advances in this field.

• The paper demonstrates how network slicing leverages SDN and NFV to enable tailored, multi-tenant 5G services that meet diverse industry requirements.
• It details an integrated architectural framework that abstracts and partitions resources for dynamic service provisioning and improved performance isolation.
• The paper outlines challenges in management, security, and orchestration, urging innovative solutions for scalable and secure 5G deployments.

Network Slicing for 5G with SDN/NFV: Concepts, Architectures, and Challenges

This paper provides a comprehensive examination of network slicing as a pivotal enabler for 5G mobile communication systems, specifically through the integration of Software-Defined Networking (SDN) and Network Function Virtualization (NFV). The authors present an insightful analysis of how network slicing can address the diverse demands of vertical industries, such as automotive and healthcare, which necessitate a wide array of requirements that conventional network architectures fail to meet.

Key Concepts and Architectural Frameworks

The paper elaborates on key aspects necessary for the conceptualization and implementation of network slicing. Network slicing is defined as the creation of multiple end-to-end logical networks over a shared infrastructure, each slice tailored to meet specific service requirements. The authors highlight the use of virtualization to abstract and partition resources, facilitating efficient resource sharing among slices. This involves two primary resource types: Network Functions (NFs) and infrastructure resources.

SDN is described as an architecture that dynamically configures and abstracts network resources in a control plane, enabling the creation of tailored services. The paper explores how the SDN architecture inherently supports slicing, leveraging its recursion capabilities to extend client-server relationships across multiple abstraction layers.

Conversely, NFV is presented as a framework managing the lifecycle of network slices. The integration of SDN with NFV is essential for the management and orchestration of resources necessary for realizing virtualized NFs and services. This requires coordination between SDN controllers and the NFV Management and Orchestration (MANO) framework, including Virtualized Infrastructure Managers (VIMs) and Network Management Systems (NMS).

Exemplary Use Case and Integration

A detailed deployment scenario illustrates the integration of SDN and NFV for network slicing. The authors present a multi-tenant environment with several slices running on shared NFV Infrastructure (NFVI). Tenant and infrastructure SDN controllers manage various VNFs and network services, emphasizing resource sharing and management isolation.

Challenges and Future Directions

The paper identifies several challenges in implementing network slicing:

• Performance Isolation: Maintaining performance levels across shared infrastructure without resorting to over-provisioning requires novel resource management mechanisms.
• Management and Orchestration: In dynamic, scalable environments, management must handle rapidly changing resource demands while ensuring coordination and policy compliance.
• Security and Privacy: Open interfaces increase vulnerabilities, necessitating robust multi-level security frameworks.
• New Business Models: The paper suggests the exploration of innovative partnerships and transition strategies to accommodate new tenants and services, which calls for comprehensive regulatory and pricing frameworks.

Implications and Speculations

The integration of SDN and NFV for network slicing presents significant implications for the adaptability and agility of future 5G systems. By effectively managing diverse and evolving service requirements through automated and programmable network functions, this approach can facilitate the seamless support of various industry verticals. As researchers and industry collaborators continue to refine these technologies, ongoing advancements may yield even more efficient frameworks and solutions.

In conclusion, this paper provides a methodical exploration of network slicing as a fundamental approach to enhance the capabilities of 5G networks, leveraging SDN and NFV architectures to meet the multifaceted needs of modern industries. Continued research and development in this domain are crucial for overcoming current challenges and realizing the full potential of network slicing in future communications systems.