Network Slicing to Enable Scalability and Flexibility in 5G Mobile Networks (1704.02129v1)

Abstract: We argue for network slicing as an efficient solution that addresses the diverse requirements of 5G mobile networks, thus providing the necessary flexibility and scalability associated with future network implementations. We elaborate on the challenges that emerge when we design 5G networks based on network slicing. We focus on the architectural aspects associated with the coexistence of dedicated as well as shared slices in the network. In particular, we analyze the realization options of a flexible radio access network with focus on network slicing and their impact on the design of 5G mobile networks. In addition to the technical study, this paper provides an investigation of the revenue potential of network slicing, where the applications that originate from such concept and the profit capabilities from the network operator's perspective are put forward.

• The paper introduces network slicing to create independent virtual networks on shared infrastructures, addressing 5G's varied technical and service requirements.
• It details a methodology leveraging SDM-C and SDM-X for balanced, dynamic resource allocation amid limited spectrum and diverse radio technologies.
• The study highlights that tailored resource allocation via network slicing can reduce costs and enhance performance, supporting applications like smart factories and tactile internet.

Network Slicing for Scalability and Flexibility in 5G Mobile Networks

The development of 5G networks introduces varied technical and service requirements inherent to enhanced mobile broadband, massive machine-type communications, and ultra-reliable low-latency communications. The paper "Network Slicing to Enable Scalability and Flexibility in 5G Mobile Networks" explores addressing these multifaceted demands through network slicing. This concept effectively leverages the underlying network infrastructure to operate multiple logical networks tailored for distinct applications and performance criteria.

Network Slicing: Definition and Design Challenges

Network slicing encompasses the creation of independent virtualized networks that coexist on shared physical infrastructures. Each network slice is an end-to-end construct characterized by unique resource allocations and performance parameters, ensuring that operators can cater to diverse services simultaneously. However, this dynamic configuration presents several challenges:

1. Granularity Constraints: The limited spectrum availability in the radio access network (RAN) necessitates efficient resource sharing. Multiplexing gains are crucial to overcome these limitations, especially when dedicated carriers for individual slices could reduce overall resource efficiency.
2. RAT Heterogeneity: The coexistence of varied radio access technologies (RATs) presents complex scenarios where careful resource allocation is needed to meet distinct service requirements.
3. Security and Transparency: Ensuring security while sharing resources among slices introduces potential vulnerabilities. Moreover, the transparency—or awareness—of slices by user equipment (UE) affects the flexibility of network operations and user mobility.
4. Resource Brokerage: Network slicing allows infrastructure providers to optimize resource distribution among multiple tenants with varied requirements, highlighting a need for advanced resource allocation algorithms.

Applications and Economic Implications

Network slicing finds critical applications in domains such as smart factories and the tactile internet, supporting stringent requirements for latency, reliability, and security. The ability to tailor slices for specific use cases diminishes underutilized resources, potentially increasing operator revenue. The approach enables dynamic allocation of resources based on precise needs, reducing capital and operational expenditures without compromising service quality.

Architectural Considerations

A pivotal aspect of implementing network slicing in 5G involves coordinating shared and dedicated network functions. This involves establishing:

• Software Defined Mobile Network Control (SDM-C): Overseeing resource allocation to maintain service level agreements across various slices.
• End-to-End Network Slicing: Integrating dedicated and shared components within a coherent architectural framework, ensuring consistent performance for each network slice.

The paper emphasizes the significance of SDM-X, which administers shared resources efficiently, underscoring the necessity of balancing static and dynamic resource allocation to optimize use.

Future Directions and Challenges

Despite the promise of network slicing, its realization poses significant technical challenges. Future research should focus on refining network virtualization techniques, developing robust security frameworks, and enhancing resource allocation algorithms to fully harness the potential of network slicing in 5G ecosystems. Additionally, evolving standards and collaboration among stakeholders will be pivotal in facilitating widespread adoption and integration of network slicing.

In conclusion, network slicing offers a structured, efficient approach to addressing the complex requirements of future 5G networks. Its implementation holds substantial potential for optimizing network operations, maximizing resource utilization, and elevating the versatility of mobile networks to accommodate a broad spectrum of services and applications.