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draft-TR 23.726 (SA2)
Study on Enhancing Topology of SMF and UPF in 5G Networks

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V0.2.0 (Wzip)    2018/03    32 p.

Rapporteur:  Mr. Thiebaut, Laurent
See also:  –

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.


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1   Scope   Word-p. 6
2   References
3   Definitions, symbols and abbreviations
4   Architecture Requirements, Assumptions and principles   Word-p. 7
5   Use cases and Key Issues
6   Solutions      Up
6.1   Solution #1: Mobility between service areas
6.2   Solution #2: Selection of I-SMF and V-SMF      Up
6.3   Solution #3: Mobility between SMF service areas
6.4   Solution #4: I-SMF selection by the AMF
6.5   Solution #5:
6.6   Solution #6: SMF selection and reselection due to different region:
6.7   Solution #7: UL-CL/BP Insertion   Word-p. 21
6.8   Solution #8: IP address allocation by the UPF
6.9   Solution #9: One-time IP Address reservation for SMF by UPF   Word-p. 25
6.10   Solution #10: IP address assignment by the SMF via IP section allocation   Word-p. 27
6.11   Solution #11: IP address assignment by the SMF via external Node coordination
6.X   Solution #X:   Word-p. 31
7   Conclusions
A   Change history   Word-p. 32

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