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draft-TR 23.794 (SA2)
Study on Enhanced IMS to 5GC Integration

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V0.2.0 (Wzip)    2018/03    30 p.

Rapporteur:  Mr. Joul, Christopher
See also:  –

The aim of this Technical Report is to study and specify potential enhancements to the IMS architecture to enable IMS FE to integrate with the 5GC network functions to enable IMS applications to directly leverage the features and capabilities of 5GC.

The specific capabilities of 5GC included in this study:
  • In regard to 5GC network slicing; what enhancements (if any) are necessary for IMS to efficiently support devices and networks with multiple slices and different IMS services per slice?
  • Should (and How does) IMS leverage the 5GC's support for localized routing of traffic and placement of IMS elements? How do such optimizations impact IMS media bearers, IMS signalling bearers, and IMS functions? How is service continuity provided in presence of localized routing?
  • Whether and how can IMS applications and network functions utilize the service based capabilities and service based interfaces of the 5GC (for interactions between the IMS and the 5GC)? Which 5GC functions should be interfaced with IMS using service based interfaces?


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1   Scope   Word-p. 6
2   References
3   Definitions, symbols and abbreviations
4   Architecture Assumptions
5   Key Issues
6   Solutions
6.1   Solution 1: Entire IMS in localized network
6.2   Solution 2: IMS AS Influences routing of IMS media traffic as a 5G AF   Word-p. 13
6.3   Solution 3: P-CSCF Influences routing of IMS media traffic as a 5G AF
6.4   Solution 4: Multi-homing based PSA addition to the PDU Session for IMS for localized routing   Word-p. 18
6.5   Solution 5: Routing of IMS traffic via a localised UPF with two IP addresses
6.6   Solution 6: Routing of IMS traffic via a localised UPF with three IP addresses      Up
6.7   Solution 7: IMS traffic local routing by applying AF influence mechanism
6.8   Solution 8: Application Function influence on network slice selection      Up
6.x   Solution #X: <Solution Title>   Word-p. 29
7   Overall Evaluation      Up
8   Conclusions
A   Change history   Word-p. 30

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