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Advanced: True Fixed-Mobile Convergence (FMC) with 5G

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A presentation/video looking at how true fixed-mobile convergence will be achieved in 5G. The main motivation for this tutorial is the fact that 5G is designed to enable access-neutral service availability. What this means is that 5G services in future will be available seamlessly not just over 5G NR but also over Wi-Fi and Wireless access networks.

The tutorial discusses:
• Untrusted non-3GPP access networks;
• Trusted non-3GPP access networks (TNAN);
• Wireline access networks;
• Non-5G-Capable over WLAN (N5CW);
• Access Traffic Steering, Switching and Splitting (ATSSS)

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Advanced: True Fixed-Mobile Convergence (FMC) with 5G

  1. 1. True Fixed-Mobile Convergence (FMC) with 5G @3g4gUK
  2. 2. Background Material ©3G4G
  3. 3. Support of non-3GPP access ©3G4G • 3GPP TS 23.501:4.2.8 - Support of non-3GPP access • The 5G Core Network supports connectivity of UEs via non-3GPP access networks, e.g. WLAN access networks • The following types of non-3GPP access networks are defined: 1. Untrusted non-3GPP access networks; 2. Trusted non-3GPP access networks (TNAN); 3. Wireline access networks.
  4. 4. Control plane function group 5GS Service Based Architecture (SBA) ©3G4G Data Network (DN)gNodeB (NG-RAN) 5G UE User plane function UPF AMF SMF NSSF NEF NRF AUSFFE PCFFEUDM 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 N3IWF Non-3GPP InterWorking Function 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
  5. 5. Simplified 5GS SBA ©3G4G AMF SMF UPF DN N11 N4 N6 3GPP Access N2 N3 N1(Air Interface) HPLMN HPLMN Home PLMN
  6. 6. Support of non-3GPP access ©3G4G Non-3GPP Access Untrusted Trusted Wireline 5G Core (5GC) 3GPP Access (NG-RAN)
  7. 7. Trusted and Untrusted Non-3GPP Access: General Concepts #1 ©3G4G • The 5G Core Network supports both untrusted non-3GPP access networks and trusted non-3GPP access networks (TNANs). • An untrusted non-3GPP access network shall be connected to the 5G Core Network via a Non-3GPP InterWorking Function (N3IWF). • A trusted non-3GPP access network shall be connected to the 5G Core Network via a Trusted Non-3GPP Gateway Function (TNGF). • Both the N3IWF and the TNGF interface with the 5G Core Network CP and UP functions via the N2 and N3 interfaces, respectively.
  8. 8. Trusted and Untrusted Non-3GPP Access: General Concepts #2 ©3G4G • A non-3GPP access network may advertise the PLMNs for which it supports trusted connectivity and the type of supported trusted connectivity (e.g. "5G connectivity"). • Therefore, the UEs can discover the non-3GPP access networks that can provide trusted connectivity to one or more PLMNs. • The UE decides to use trusted or untrusted non-3GPP access for connecting to a 5G PLMN by using procedures not defined by 3GPP.
  9. 9. Trusted and Untrusted Non-3GPP Access: General Concepts #3 ©3G4G • When the UE decides to use untrusted non-3GPP access to connect to a 5G Core Network in a PLMN: • the UE first selects and connects with a non-3GPP access network; and then • the UE selects a PLMN and an N3IWF in this PLMN. The PLMN/N3IWF selection and the non-3GPP access network selection are independent. • When the UE decides to use trusted non-3GPP access to connect to a 5G Core Network in a PLMN: • the UE first selects a PLMN; and then • the UE selects a non-3GPP access network (a TNAN) that supports trusted connectivity to the selected PLMN. In this case, the non-3GPP access network selection is affected by the PLMN selection.
  10. 10. Untrusted Non-3GPP Access Architecture ©3G4G AMF SMF UPF DN N11 N4 N6 3GPP Access N3IWF Untrusted Non-3GPP Access N2 N2 N3 N3 N1(Air Interface) Y2 Y1 N1 NWu HPLMN Non-3GPP Networks Based on 3GPP TS 23.501 Figure 4.2.8.2.1-1: Non-roaming architecture for 5G Core Network with untrusted non-3GPP access
  11. 11. 5GS SBA with Untrusted Non-3GPP Access ©3G4G Data Network (DN)gNodeB (NG-RAN) 5G UE User plane function UPF AMF SMF NSSF NEF NRF AUSFFE PCFFEUDM AF UDR FE UDC N1 N2 N3 N6 N4 Nnssf Nnef Nnrf Nudm Nausf Npcf Naf N3IWF N2 N1 Y2 N3 Y1 NWu Data Network (DN) User plane function UPF N6
  12. 12. Trusted Non-3GPP Access Network (TNAN) Trusted Non-3GPP Access Architecture ©3G4G AMF SMF UPF DN N11 N4 N6 3GPP Access Trusted Non-3GPP Access Point (TNAP) N2 N3 N1 (Air Interface) HPLMN Based on 3GPP TS 23.501 Figure 4.2.8.2.1-2: Non-roaming architecture for 5G Core Network with trusted non-3GPP access Trusted Non-3GPP Gateway Function (TNGF) N3 N2 Tn Yt N1 NWt Ta
  13. 13. 5GS SBA with Trusted Non-3GPP Access ©3G4G Data Network (DN)gNodeB (NG-RAN) 5G UE User plane function UPF AMF SMF NSSF NEF NRF AUSFFE PCFFEUDM AF UDR FE UDC N1 N2 N3 N6 N4 Nnssf Nnef Nnrf Nudm Nausf Npcf Naf TNAN N2 N1 Y2 N3 Yt NWt Data Network (DN) User plane function UPF N6
  14. 14. Introducing the Wireline Access Terminology #1 ©3G4G • RG: The Residential Gateway (RG) is a device providing, for example voice, data, broadcast video, video on demand, to other devices in customer premises. • 5G-RG: A 5G-RG is a RG capable of connecting to 5GC playing the role of a UE with regard to the 5G core. It supports secure element and exchanges N1 signalling with 5GC. The 5G-RG can be either a 5G-BRG or 5G-CRG. • 5G-BRG: The 5G-BRG is a 5G-RG defined in BBF. • 5G-CRG: The 5G-CRG is a 5G-RG specified in DOCSIS MULPI.
  15. 15. Introducing the Wireline Access Terminology #2 ©3G4G • W-AGF: The Wireline Access Gateway Function (W-AGF) is a Network function in W-5GAN that provides connectivity to the 5G Core to 5G- RG and FN-RG. • FN-RG: A Fixed Network Residential Gateway (FN-RG) is a RG that it does not support N1 signalling and it is not 5GC capable. • W-5GAN: The Wireline 5G Access Network (W-5GAN) is a wireline AN that connects to a 5GC via N2 and N3 reference points. The W-5GAN can be either a W-5GBAN or W-5GCAN. • W-5GBAN: Wireline 5G BBF Access Network defined in BBF. • W-5GCAN: Wireline 5G Cable Access Network defined in CableLabs.
  16. 16. W-5GAN Wireline Non-3GPP Access Architecture with 5G-RG ©3G4G AMF SMF UPF DN N11 N4 N6 3GPP Access N2 N3 N1 Based on 3GPP TS 23.501 Figure 4.2.8.4-1: Non- roaming architecture for 5G Core Network for 5G-RG with Wireline 5G Access network and NG RAN W-AGF N3 N2 N1 Y4 5G-RG
  17. 17. W-5GAN Wireline Non-3GPP Access Architecture with FN-RG ©3G4G AMF SMF UPF DN N11 N4 N6 3GPP Access N2 N3 Based on 3GPP TS 23.501 Figure 4.2.8.4-2: Non- roaming architecture for 5G Core Network for FN-RG with Wireline 5G Access network and NG RAN W-AGF N3 N2 N1 Y5 FN-RG
  18. 18. 5GS SBA with Wireline Access ©3G4G Data Network (DN)gNodeB (NG-RAN) User plane function UPF AMF SMF NSSF NEF NRF AUSFFE PCFFEUDM AF UDR FE UDC N1 N2 N3 N6 N4 Nnssf Nnef Nnrf Nudm Nausf Npcf Naf W-5GAN N2 N1 N3 Y4 Data Network (DN) User plane function UPF N6 5G-RGFN-RG Y5 N1
  19. 19. N5CW: Non-5G-Capable over WLAN #1 ©3G4G • The devices that do not support 5GC NAS signalling over WLAN access are referred to as "Non-5G-Capable over WLAN" UEs, or N5CW UEs for short. • A N5CW UE is not capable to operate as a 5G UE that supports 5GC NAS signalling over a WLAN access network, however, it may be capable to operate as a 5G UE over NG-RAN. • Release-16 specifies 5GC architectural enhancements that enable N5CW UEs to access 5GC via trusted WLAN access networks.
  20. 20. N5CW: Non-5G-Capable over WLAN #2 ©3G4G • Not all trusted WLAN access networks support 5GC access from N5CW UEs. • To support 5GC access from N5CW UEs, a trusted WLAN access network must support a TWIF function. • When a N5CW UE performs an EAP-based access authentication procedure to connect to a trusted WLAN access network, the N5CW UE may simultaneously be registered to a 5GC of a PLMN. The 5GC registration is performed by the TWIF function in the trusted WLAN access network, on behalf of the N5CW UE.
  21. 21. Trusted WLAN Access Network 5GC access from N5CW UEs Architecture ©3G4G AMF SMF UPF DN N11 N4 N6 3GPP Access N2 N3 Based on 3GPP TS 23.501 Figure 4.2.8.5.2-1: Non-roaming and LBO Roaming Architecture for supporting 5GC access from N5CW UEs Trusted WLAN Interworking Function (TWIF) N3 N2 N1 YtN5CW UE Trusted WLAN Access Point (TWAP) Yw
  22. 22. ATSSS: Access Traffic Steering, Switching and Splitting ©3G4G • New Access Traffic Steering, Switching and Splitting (ATSSS) functionality has been designed in Release 16, which allows traffic steering across multiple accesses at a finer granularities than a PDU session. • The ATSSS feature is an optional feature in Release 16 both on the UE and the 5GC network • ATSSS introduces the notion of Multi Access PDU session, a PDU session for which the data traffic can be served over one or more concurrent accesses (3GPP access, trusted non-3GPP access and untrusted non-3GPP access).
  23. 23. Non-3GPP Access Architecture Reference Model for ATSSS Support ©3G4G AMF SMF UPF DN N11 N4 N6 3GPP Access N2 N3 N1 Based on 3GPP TS 4.2.10-1: Non-roaming and Roaming with Local Breakout architecture for ATSSS support N3 N2 N1 PCF N7 UE MPTCP functionality ATSSS-LL functionality MPTCP Proxy functionality PMF
  24. 24. References ©3G4G • 3GPP TS 23.501 v16.1.0: System Architecture for the 5G System; Stage 2 – Section 4.2 contains details regarding this topic • WBA and NGMN Alliance: RAN Convergence Paper, August 2019 • Broadband Forum – MR-427: 5G Fixed-Mobile Convergence, July 2018 • Wireless Broadband Alliance (WBA) Whitepaper – WBA 5G Workgroup: Unlicensed Integration with 5G Networks, October 2018 • Metaswitch – The 5G Access Gateway Function (AGF): An Evolutionary Tale, June 2019
  25. 25. Thank You To learn more, visit: 3G4G Website – https://www.3g4g.co.uk/ 3G4G Blog – https://blog.3g4g.co.uk/ Operator Watch – https://operatorwatch.3g4g.co.uk/ Connectivity Technology Blog – https://www.connectivity.technology/ 3G4G Small Cells Blog – https://smallcells.3g4g.co.uk/ Follow us on Twitter: https://twitter.com/3g4gUK Follow us on Facebook: https://www.facebook.com/3g4gUK/ Follow us on LinkedIn: https://www.linkedin.com/company/3g4g Follow us on SlideShare: https://www.slideshare.net/3G4GLtd Follow us on YouTube: https://www.youtube.com/3G4G5G ©3G4G

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