网络切片 - Network Slicing

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已于 2022-08-17 13:28:24 修改

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分类专栏：通信基础文章标签：网络

于 2022-08-16 16:04:21 首次发布

原文链接：https://ieeexplore.ieee.org/abstract/document/7529130

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无线网络切片是一种资源分配策略，允许为不同用户提供定制的服务并确保服务质量。切片可以按用户设备类型、服务类型（如VoIP）或特定运营商的用户来定义。每个切片具有独立性，可提供不同的服务质量保证，如QoS切片用于保障特定设备或应用的性能，而基础设施共享切片则允许虚拟运营商控制网络资源。这种技术增强了网络的灵活性和资源利用率。

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Definition

For the most general definition, a slice can be considered as a set of flows belonging to different end users (mobile clients of the wireless service in our case). Then, a slice supports flows of multiple end users, but at the same time, an end user can participate in multiple slices. A flow (stream of packets) is an atomic entity in this approach, it can have specific QoS requirements and is a member of a single slice. For example, a flow in an IP network could be defined by the tuple composed by source and destination IP addresses and ports.

Furthermore, a slice can be defined as a subset of network resources allocated to a tenant (virtual operator or service provider), with complete control over those resources. An important aspect of the slicing design approach is the delivery of customization and programmability tools to the tenant.

Examples

Examples of slices can be: all the flows whose source or destination is a given type of device such as sensors; or all the flows from a VoIP service; or, all the flows with source or destination the end user of a given operator. Depending on the specification of a slice, an end user can participate on different slices but, slices are always independent between each other. In the context of wireless networks, we envision two big scenarios for using slices:

Quality of Service Slicing: the idea is to create slices to offer different services and assure some type of QoS within the slice. For example, a slice can be created to give service to a specific group of devices with the same requirements (sensors or smartphones) or by type of application (e.g., a slice for multimedia services).
Infrastructure Sharing Slicing: this is the traditional idea of network virtualization applied to the wireless domain. There is a tenant (e.g., Mobile Virtual Network Operator), which is given a slice of the network. The tenant has complete control over the network infrastructure and functions within the slice.

参考文献：

[1] Richart M, Baliosian J, Serrat J, et al. Resource slicing in virtual wireless networks: A survey[J]. IEEE Transactions on Network and Service Management, 2016, 13(3): 462-476.