The 5G Session Management Function (SMF) is a fundamental element of the 5G Service-Based Architecture (SBA ). For your convenience, the picture of 5G System Service Based Architecture is described below once again. The session management function (SMF ) is part of control plane function within 5G Core Network. What is the 5G session management function (SMF)? What does SMF stand for in network?
A single instance of SMF can support some or all the functionalities of the SMF. In fact at the high level LTE eNB and 5g gNB have same functionalities. The 5G stands for 5th generation of wireless technology. It follows 3GPP road map from which LTE i. LTE advanced have been developed. The figure-depicts 5G reference point architecture as specified in 3GPP TS 38.
This is non-roaming 5G architecture. SMF – Session Management Function The Session Management Function is related to the 3GPP 5G Architecture and is one of the main functions in the Next Generation Core. As such, it includes various functionality relating to subscriber sessions, e. G User Plane Protocol Stack, employing STP with 5G header extensions The UPF identifies user plane traffic flow based on information received from the SMF over the Nreference point. A stateful UDM keeps data on hand locally, while a stateless UDM stores data externally in the UDR. A stateful architecture shares data among microservices that orchestrate communication between the network planes.
Some organizations prefer to have stateful microservices because of the record they keep. The downside is that if a problem arises, then all microservicessharing information must be taken off the network at once. A stateless architecture keeps subscriber data separate from the functions it supports. This way, database access is kept separate from the operation of the network, improving stability and flexibility.
See full list on sdxcentral. Subscriber data is provided to the session management function ( SMF ), which allocates IP addresses and manages user sessions on the network. Depending on the construction of the network, both UDM software and the UDR can send and store data.
In a stateless network, user information is stored in the UDR, but the UDM function retrieves the data, sends it to other network functions and generally manages it. The access and mobility function (AMF) receives user information sent through the network. The UDM can do this with many UDRs. It then forwards the information to the SMF , which uses it to determine what session manager would be best assigned to the user. Consider the SMF as a gateway from the user plane to the control plane of the network.
The HSS of 4G networks fills a similar function to the UDR. It stores customer profile data and authentication information along with encryption keys. The AUSF authenticates servers and provides encryption keys. Below are the SMF Services and SMF Service Operations.
This service manages the PDU sessions. AMF (Access and Mobility Management Function): It performs operations like Mobility Management, Registration Management, Connection Management, UE based authentication, etc. Based on the Service requested by Consumer, AMF selects the respective SMF for managing the user session context. When compared with 4G EPC, it’s functionalities resembles with MME of 4G Network. In the 5G Core (5GC) network, the Session Management Function ( SMF ) interacts with the Access and Mobility Function (AMF) to establish, modify, and release PDU sessions through the Nsmf Service-Based Interface.
When a UE initiates a PDU session request, the serving AMF selects an SMF that will establish and manage that session. Created and processe inside the NAS-SM layer of UE and the SMF. While the SMF is the control plane of packet switching, the UPF actually handles the user plane traffic. Use our SMF emulator in your 5G testing to test the control plane capacity and performance of your UPF network element. The SM signalling message is handle i. With dsTest you can easily scale a test to simulate millions of subscribers that attempt to establish Nsessions at the rate you choose.
Session Management Function ( SMF ) Unified Data Management (UDM) User plane Function (UPF) Application Function (AF) User Equipment (UE) The 5G architecture is defined as service-based and the interaction between network functions is represented in two ways.