Network Slice Selection Function(NSSF)

Network slicing is a key native capability of 5G that can maximize the performance of communication networks and reduce network construction and operation and maintenance costs, and it has become an industry consensus that "slicing is capability and slicing is product" in the 5G era.
The core network, as a key anchor point for network differentiation and operation, has emerged as a more important network in the 5G era, providing the ability to deploy network functions and resources on-demand to meet the diverse business needs of future vertical industries.
Network Slice Selection Function(NSSF)
Key Benefits
End-to-end network security SLA
Serve different services or vertical industries
Based on the cloud-based infrastructure
On-demand network function customization
IPLOOK's  5GC  NSSF
IPLOOK 5GC NSSF can bring the following values to end-users, tenants and operators.
•  End-users: End-users get the best service experience with guaranteed SLA provided by end-to-end sliced network with end-management and cloud collaboration.
•  Tenant: Reduce network usage cost based on resource sharing, achieve end-to-end guaranteed network SLA through isolation technology and on-demand deployment, quickly meet service demand and service upgrade and evolution through on-demand feature customization, and achieve simple operation and network capacity usage through open capabilities provided by the sliced network.
  Operators: Maximize the value of network infrastructure, enable and develop a large vertical industry user base; realize efficient and rapid network construction through resource sharing and dynamic deployment, and at the same time, service uptime and business innovation are faster, which will promote the formation of a new industrial ecosystem.
Features 
 
Comply to  3GPP R15/R16 Standards
Interface Function
»  N22 Interface
»  N31 Interface
»  Web Server
NSSAI Selection Service Function
»  Retrieve the network slice information during the registration procedure
»  Retrieve the network slice information during the PDU session establishment procedure
»  Retrieve the network slice information during UE configuration update procedure
NSSAI Availability Service Function
»  Upate NSSAI
»  Delete NSSAI
»  Subscription/Unsubscription NSSAI status
NetworkFunction Management
»  NF Register
»  NF Deregister
»  NF Subscription
Operation and Maintenance
»  KPI Management
»  Fault Management
»  Log Management
»  Configuration Management
»  License Management
»  Remote Operation and Maintenance 
»  SSH
»  Availability
Open Northbound interface and graphical web based management interface
»  RESTful
»  API
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5G Core Network(5GC) holds a key role in realizing the full potential of 5G services. Without 5GC, fully-fledged NR services cannot be obtained. 5G NSA deployment leaning on traditional LTE network and EPC allows for a quick launch of 5G services, but also hinders the realization of 5G' s full potential.

Base on Service Based Architecture(SBA), in 5GC, a cloud native design is introduced to enable flexible scaling and upgrades.
Learn More
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The User Plane Function (UPF) represents the data plane evolution of a Control and User Plane Separation (CUPS) strategy, which is a fundamental component of the 3GPP 5G core network(5GC).

The UPF plays the most critical role in the process of data transfer. It provides the interconnect point between the mobile infrastructure and the Data Network (DN), i.e. encapsulation and decapsulation of GTP-U.
Learn More
Network Exposure Function(NEF)
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NEF, located between the 5G core network and external third-party application functionaries (and possibly some internal AFs), is responsible for managing the external open network data, and all external applications that want to access the internal data of the 5G core must pass through the NEF.

By opening the network capability to third-party applications, it can realize the friendly connection between network capability and business requirements, improve business experience and optimize network resource allocation.
Learn More
Network Repository Function(NRF)
Network Repository Function(NRF)
NRF, one of the network functions of the 5G core network(5GC). It supports the service discovery feature, which receives NF discovery requests from NF instances and provides information about the discovered NF instance (discovered) to another NF instance. Registration information includes NF type, address, service list, etc.
Learn More
Unified Data Management(UDM) / Authentication Server Function(AUSF)
Unified Data Management(UDM) / Authentication Server Function(AUSF)
UDM: The same as 4G’ s HSS (Home Subscriber Services), UDM is a centralized way to process network user data in 5G through Nudm interfaces to provide services for AMF, SMF, SMSF, AUSF, NEF and GMLC. It also provides services such as authorization of accessing, registration, uninterrupted services.

AUSF: As a major part of 5GC to facilitate security processes, AUSF performs the authentication function of identifying UEs and storing authentication keys.
Learn More
Policy Control Function(PCF)
Policy Control Function(PCF)
The 5G PCF performs the same function as the PCRF in 4G networks.

• Provides policy rules for control plane functions. This includes network slicing, roaming and mobility management.
• Accesses subscription information for policy decisions taken by the UDR.
• Supports the new 5G QoS policy and charging control functions.
Learn More
Session Management Function(SMF)
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SMF is a fundamental element of the 5G Service-Based Architecture (SBA). The SMF keeps trace of PDU sessions and QoS Flows in the 5GC for UEs and make sure their states and status are in sync between Network Functions in Control and User Planes.
It also receives PCC (Policy and Charging Control) Rules from PCF (Policy Charging Function) and convert PCC Rules into SDF Templates, QoS Profiles and QoS Rules for UPF, gNB and UE respectively for QoS Flows establishment, modification and release etc.
Learn More
Access and Mobility Management Function(AMF)
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AMF terminates the control plane of different access networks onto the 5G Core Network(5GC) and control which UEs can access the 5GC to exchange traffic with DNs. It also manages the mobility of UEs when they roam from one gNB to another for session continuity, whenever possible.
Learn More
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