In this tutorial we look at the 5G Applications architecture. We discuss 5G applications, application functions and application servers and how they fit together in a 5G Service Based Architecture All our #3G4G5G slides and videos are available at: Videos: https://www.youtube.com/3G4G5G Slides: https://www.slideshare.net/3G4GLtd 5G Page: https://www.3g4g.co.uk/5G/ Free Training Videos: https://www.3g4g.co.uk/Training/

1. Intermediate:
5G Applications Architecture
A look at Application Functions & Application Servers
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2. Over-the-top (OTT) Applications
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Any Generation of Mobile Cellular
Network
Other Dedicated Non-GBR Signalling Bearer
Other Dedicated Non-GBR Signalling Bearer
Default Non-GBR Data Bearer
Other Dedicated GBR Data Bearer
Other Dedicated GBR Data Bearer
Native
Application
Native
Application

3. Over-the-top (OTT) Applications
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Any Generation of Mobile Cellular
Network
Other Dedicated Non-GBR Signalling Bearer
Other Dedicated Non-GBR Signalling Bearer
Default Non-GBR Data Bearer
Other Dedicated GBR Data Bearer
Other Dedicated GBR Data Bearer
OTT Apps OTT Apps Servers
Native
Application
Native
Application
‘Best Effort’ Data Packets

4. Trusted & Untrusted Applications
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• Trusted (Native) Applications
• Voice & Video Telephony (Call)
• SMS / Messaging
• V2X Applications
• XR Applications
• Untrusted (OTT) Applications
• Internet Browsing
• WhatsApp, Skype, Viber, Messenger, Telegram, Signal, etc.
• Netflix, YouTube, etc.
• LinkedIn, Facebook, etc.

5. Control plane
function group
5GS Service Based Architecture (SBA)
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Data Network
(DN)
gNodeB
(NG-RAN)
5G UE
User plane
function
UPF
AMF SMF
NSSF NEF NRF AUSFFE PCFFE
UDM AF
UDR
FE
UDC
N1
N2
N3 N6
N4
Nnssf Nnef Nnrf Nudm Nausf Npcf Naf
AF Application Function
AMF Access and Mobility management Function
AUSF Authentication Server Function
DN Data Network
FE Front End
NEF Network Exposure Function
NRF NF Repository Function
NSSF Network Slice Selection Function
PCF Policy Control Function
(R)AN (Radio) Access Network
SEPP Security Edge Protection Proxy
SMF Session Management Function
UDM Unified Data Management
UDR Unified Data Repository
UDSF Unstructured Data Storage Function
UE User Equipment
UPF User Plane Function

6. Third Party Applications (Trusted & Untrusted)
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3rd Party Applications are applications that have been approved by the
operators to use the operator core network, either directly or via access
to exposed API.
• A Trusted application resides in
trusted data network and would
use the Network Repository
Function (NRF) for communications
with the core.
• An Untrusted application resides in
untrusted data network and would
use the Network Exposure Function
(NEF) for communications with the
core.

7. Control plane
function group
5GS Service Based Architecture (SBA)
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Data Network
(DN)
gNodeB
(NG-RAN)
5G UE
User plane
function
UPF
AMF SMF
NSSF NEF NRF AUSFFE PCFFE
UDM AF
UDR
FE
UDC
N1
N2
N3 N6
N4
Nnssf Nnef Nnrf Nudm Nausf Npcf Naf
AF Application Function
AMF Access and Mobility management Function
AUSF Authentication Server Function
DN Data Network
FE Front End
NEF Network Exposure Function
NRF NF Repository Function
NSSF Network Slice Selection Function
PCF Policy Control Function
(R)AN (Radio) Access Network
SEPP Security Edge Protection Proxy
SMF Session Management Function
UDM Unified Data Management
UDR Unified Data Repository
UDSF Unstructured Data Storage Function
UE User Equipment
UPF User Plane Function

8. 5G-XR Functions in 5GS
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9. V2X Functions in 5GS
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4.4.3 V2X Application Server
The V2X Application Server (V2X AS) includes AF functionality, and
may support at least the following capabilities:
For V2X services handling,
- Receive uplink data from the UE over unicast.
- Send downlink data to the UE over unicast.
- Request QoS Sustainability Analytics for potential QoS changes in
a geographic area from NWDAF via NEF.
For V2X service parameters provisioning,
- Provision the 5GC with parameters for V2X communications over
PC5 and Uu reference points.
- Provision the UE with parameters for V2X communications over
PC5 reference point and/or Uu reference point.
NOTE: The V2X Application Servers for V2X services handling
and V2X service parameter provisioning can be the same or different.

10. Enhanced SBA Supporting UAV Network Services
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11. Control plane
function group
Multi-access Edge Computing (MEC) Architecture in 5G SBA
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Data Network
(DN)
gNodeB
(NG-RAN)
5G UE
AMF SMF
NSSF NEF NRF AUSFFE PCFFE
UDM
AF
UDR
FE
UDC
N1
N2
N3
N6
N4
Nnssf Nnef Nnrf Nudm
UPF
Nausf Npcf
Naf
UPF
N9
MEC
N5

12. Further Reading
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• 3G4G Tutorial: 5G Service Based Architecture (SBA) (link)
• The 3G4G Blog: 5G eXtended Reality (5G-XR) in 5G System (5GS) (link)
• 3GPP TR 26.928: Extended Reality (XR) in 5G (Release 16) (link)
• The 3G4G Blog: An Introduction to Vehicle to Everything (V2X) and Cellular V2X (C-
V2X) (link)
• 3GPP TS 23.287: Architecture enhancements for 5G System (5GS) to support
Vehicle-to-Everything (V2X) services
• Connectivity Technology Blog: A Service-Based Architecture for enabling UAV
enhanced Network Services (link)
• ResearchGate: Exploitation of Mobile Edge Computing in 5G Distributed Mission-
Critical Push-to-Talk service deployment (link)
• Dell’Oro: 5G Core – Are We Ready? (link)
• The 3G4G Blog: 5G Private and Non-Public Network (NPN) (link)

13. Thank You
To learn more, visit:
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3G4G Blog – https://blog.3g4g.co.uk/
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Operator Watch Blog – https://www.operatorwatch.com/
Connectivity Technology Blog – https://www.connectivity.technology/
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