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TR 23.726SA2
Study on enhancing
Topology of SMF and UPF
in 5G Networks

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V16.0.0 (Wzip)  2018/12  96 p.

WI Acronym:  FS_ETSUN
Rapporteur:  Mr. Thiebaut, LaurentNokia France

The objective of this Technical Report is to study enhancements of 5GS architecture that has been defined in Rel-15 about the topology of SMF and UPF, and:
  1. investigate mechanisms to enable the 3GPP system to support deployments where a SMF is not able / allowed to control UPF(s) throughout the same PLMN.
  2. Study whether it is needed to enhance the capability of 5GS architecture for a UPF to be controlled by multiple SMF's (and many UPF's to be controlled by many SMFs) and, if yes, define such enhancements.
For these objectives, use cases will be defined.

full Table of Contents for  TR 23.726  Word version:   16.0.0

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1  ScopeWord-p. 8
2  References
3  Definitions, symbols and abbreviations
4  Architecture Requirements, Assumptions and principles
5  Use cases and Key Issues
6  SolutionsWord-p. 14
6.1  Solution #1: Mobility between service areas
6.2  Solution #2: Selection of I-SMF and V-SMFWord-p. 28
6.3  Solution #3: Mobility between SMF service areas
6.4  Solution #4: I-SMF selection by the AMF
6.5  Solution #5: I-SMF as only a UPF Controller
6.6  Solution #6: SMF selection and reselection due to different region:Word-p. 40
6.7  Solution #7: UL-CL/BP Insertion
6.8  Solution #8: UE IP address allocation by the UPF
6.9  Solution #9: One-time IP Address reservation for SMF by UPF
6.10  Solution #10: IP address assignment by the SMF via IP Section allocationWord-p. 67
6.11  Solution #11: IP address assignment by the SMF via external Node coordinationWord-p. 70
6.12  Solution #12: IP address assignment by the SMF via DN-AAA or DHCP Servers
6.13  Solution #13: Handling AF influence on traffic routing - PCF aware of I-SMF insertionWord-p. 73
6.14  Solution #14: TEID ranges assist CN tunnel Info allocationWord-p. 77
6.15  Solution #15: Handling AF influence on traffic routing
6.16  Solution #16: I-UPF insertion and L-SMF/L-UPF selectionWord-p. 81
6.17  Solution #17: I-SMF insertion during EPS to 5GS handover using N26
6.18  Solution 18: UL-CL/BP Insertion with UPF that is capable to flexibly interface any SMFWord-p. 87
6.19  Solution #19: Reduce latency to setup the user plane
6.20  Solution #20: UE IP address allocation by the UPF & UPF dealing with UP transfer to UE
7  Conclusions
A  Summary of Solutions for KI#2Word-p. 95
B  Change history

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