![]() ![]() A Slice Differentiator (SD), which is an optional information that complements the Slice/Service type(s) to differentiate amongst multiple Network Slices of the same Slice/Service type. A Slice/Service type (SST), which refers to the expected Network Slice behaviour in terms of features and services The S-NSSAI signaled by the UE to the network, assists the network in selecting a particular Network Slice instance. This means a single UE may be served by at most eight Network Slices at a time. Currently 3GPP allows up to eight (8) S-NSSAIs in the NSSAI sent in signaling messages between the UE and the Network. The NSSAI (Network Slice Selection Assistance Information) is a collection of S-NSSAIs. Identification of a Network Slice is done via the Single Network Slice Selection Assistance Information (S-NSSAI). ![]() compute, storage and networking resources) which form a deployed Network Slice.ġ.2 Identification and selection of a Network Slice Network Slice instance: A set of Network Function instances and the required resources (e.g. Network Slice : A logical network that provides specific network capabilities and network characteristics. (Note: A network function can be implemented either as a network element on a dedicated hardware, as a software instance running on a dedicated hardware, or as a virtualized function instantiated on an appropriate platform, e.g. Network Function: A 3GPP adopted or 3GPP defined processing function in a network, which has defined functional behavior and 3GPP defined interfaces. TS 23.501 defines Network Function, Slice, and Slice Instance as follows: A non-3GPP Access Network where the terminal may use any non-3GPP access to reach the 5G core network via a secured IPSec/IKE tunnel terminated on a Non-3GPP InterWorking Function (N3IWF).A Next Generation (NG) Radio Access Network described in 3GPP TS 38.300, or.A Network Slice is defined within a Public Land Mobile Network (PLMN) and includes the Core Network Control Plane and User Plane Network Functions as well as the 5G Access Network (AN). In this article we provide highlights of 3GPP Network Slicing as being defined in TS 23.501 in SA2. Each slice may serve a particular service type with agreed upon Service-level Agreement (SLA). A given User Equipment (UE) may access to multiple slices over the same Access Network (e.g. Figure 2 depicts an example of Network Slicing.įigure 1: 5G network architecture (non-roaming)Ī network slice is viewed as a logical end-to-end network that can be dynamically created. Figure 1 depicts the non-roaming reference architecture. The work on these Technical Specifications is ongoing with target completion date being December 2017. Technical Specification (TS) 23.503 defines Policy and Charging Control Framework for the 5G System. Technical Specification (TS) 23.502 defines procedures for the 5G System. Technical Specification (TS) 23.501 defines Stage-2 System Architecture for the 5G System which includes Network Slicing. The 3GPP SA2 Working Group, responsible for overall system architecture, is currently working on specifying the 5G Core (5GC) architecture with Network Slicing being a main feature of 5GC. This article gives an overview of current 3GPP Service and Systems Aspects (SA) standard status for the development of mobile network slicing for 3GPP Release 15 whose target completion date is June 2018. It is spending significant effort to develop comprehensive network slice related standards in various working groups, particularly SA1 (service requirements), SA2 (architecture), SA3 (security) and SA5 (network management). 3GPP is considering network slicing as one of the key features of 5G. Network slicing is an important capability to bring network resource utilization efficiency, deployment flexibility and support fast growing over the top (OTT) application and services. Tony Saboorian ( and Amanda Xiang ( Huawei Network Slicing and 3GPP Service and Systems Aspects (SA) Standard
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