![]() This enables 5G network operators to choose the characteristics needed to support their target levels of spectrum efficiency, traffic capacity and connection density, which is how many devices can connect from a given space.ĥG service types - high-level categories of network slice architecture - that use slicing for differential handling of traffic include the following: Slicing enables service providers to create a variety of network slice architectures that deliver meaningful guarantees to customers regarding, say, a minimum amount of throughput for their connections or priority delivery of packets from specific types of devices or applications.Ī 5G network operator can physically segregate traffic on different radio networks, slice a single network, or combine the capacity of multiple networks and slice the pooled resources. These principles include radio access networks and the supporting backhaul and carrier core networks that underlie 5G, including associated data center resources. Slice implementation applies the same principles of virtualization across the entire provider network architecture. An SDN approach does enable aggregation of physical connectivity - the melding of multiple physical connections into a switch, for example - with the resulting pooled capacity then made available for slicing. This control of the data plane applies to both physical and virtual network devices managed under the SDN controller, which is a physical switch in a rack or a virtual switch running in a cloud environment or on a hypervisor in the data center. The control plane can define virtual networks by defining packet-handling rules and pushing those rules out to the data plane devices for execution. SDN separates the network's control plane from the packet-handling data plane. The concept has been more fully realized with the rise of software-defined networking and, more recently, software-defined wide area networks ( SD-WANs), which apply SDN concepts to wide area networking. Slicing technologies on Ethernet networks are as old as virtual local area networks ( VLANs). Slicing networks enables the network operator to maximize the use of network resources and service flexibility. Different slices can be dedicated to different purposes, such as ensuring a specific application or service gets priority access to capacity and delivery or isolating traffic for specific users or device classes. Network slicing is used most often in discussion of 5G networks, in part because the 5G specification calls for network slicing as a fundamental capability, whereas 4G and earlier generations of cellular data services did not and could not support network slicing.Įach slice of a network can have its own logical topology, security rules and performance characteristics - within the limits imposed by the underlying physical networks. Network slicing overlays multiple virtual networks on top of a shared network domain, that is, a set of shared network and computing resources.
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