Session Management Function(SMF)

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.
Session Management Function(SMF)
Key Benefits
Converged EPC SGW-C and 5GC SMF core network function
Designed and delivered as a Cloud-Native network function
Simplify and accelerate service deployment
Perfect compatibility with third-party core network elements
IPLOOK's  5GC  SMF
IPLOOK 5GC SMF builds upon the evolutions of the IPLOOK SGW solution in the 4G space and its evolution in the 4G architecture to evolve to CUPS to support a decomposed SGW-C as the central control plane entity that communicates over an Sx interface to the Distributed and intergrated user plane functions.
 In the 5G architecture, SMF is responsible for session management with individual functions being supported on a per session basis. SMF allocates IP addresses to UEs, and selects and controls the UPF for data transfer. SMF also acts as the external point for all communication related to the various services offered and enabled in the user plane and how the policy and charging treatment for these services is applied and controlled.
5GC SMF
Features 
 
Comply to  3GPP R15/R16 Standards
Interface Function
»  N1N2 ---Nas And Ngap
»  N4 Interface
»  N7 Interface
»  N10 Inter face
»  N11 Interface
»  N4u Interface
»  N26 interface
»  An Interface
»  Xn Interface
»  Northbound Interface (RESTful API)
»  Web Server
Operation and Maintenance
»  KPI Management
»  Fault Management
»  Log Management
»  Configuration Management
»  License Management
»  Remote Operation and Maintenance 
»  SFTP
»  Telnet
»  Web Server
»  Process State Check
»  System Alarm 
»  Session  Back up
»  Main backup
»  Quick recovery
»  Http proxy
»  Multiple Distributed deployment
»  Alarm data recovery
»  Overload control
»  Data retransmission
»  SSH
 
Basic Service Function
»  Mobility Management
»  UE/NETWORK  PDU session Management
»  Activate or UnActivate UP link
»  QoS Flow/gate contronl
»  Overload control function
»  IPV6 Support
»  Paging Support
»  UP Strategy Selection
»  Address assignment
»  Call trace
»  Secondary authentication
»  Mobility Management procedures AN Switching
»  Mobility Management procedures XN Switching
»  Branching Point or UL CL controlled
»  UE Triggered Service Request(session/PDU create,modify,release)
»  Network Triggered Service Request(notify,Subscribe,session/pdu create modify release)
»  Ladn
»  N4 Reporting
»  5GS To EPS switching 
»  Session Management
»  Procedures for Untrusted non-3GPP access(n3iwf)
»  PFCP node management
»  PFCP session management
»  UE ip management
»  SDF/APPID data checking
»  Chr Billing
»  UE/Network upip deactive
»  Network side sponsored UP reselection support
»  Signaling surface user data forwarding control
»  Suspend billing process support
»  Reflective QoS features
»  SMF  Service area support
»  NEF
»  PGW-C restart counter
»  SMF event Exposure interface
»  NF Register
»  NF Deregister
»  NF Subscription
Related Products
5G Core Network(5GC)
5G Core Network(5GC)
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
User Plane Function(UPF)
User Plane Function(UPF)
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)
Network Exposure Function(NEF)
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
Network Slice Selection Function(NSSF)
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.
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
Access and Mobility Management Function(AMF)
Access and Mobility Management Function(AMF)
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
5G Core Network(5GC)
5G Core Network(5GC)
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
User Plane Function(UPF)
User Plane Function(UPF)
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)
Network Exposure Function(NEF)
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
Network Slice Selection Function(NSSF)
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.
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
Access and Mobility Management Function(AMF)
Access and Mobility Management Function(AMF)
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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