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TR 23.794SA2
Study on enhanced IMS to 5GC Integration

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WI Acronym:  FS_eIMS5G
Rapporteur:  Mr. Joul, ChristopherT-Mobile USA Inc.

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?

full Table of Contents for  TR 23.794  Word version:   17.0.0

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1  ScopeWord-p. 8
2  References
3  Definitions and abbreviationsWord-p. 9
4  Architecture Assumptions
5  Key IssuesWord-p. 10
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
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 routingUp
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
6.7  Solution 7: IMS traffic local routing by applying AF influence mechanism
6.8  Solution 8: Application Function influence on network slice selection
6.9  Solution 9: Enhancements to Npcf services to support IMS functionalityWord-p. 35
6.10  Solution 10: Reuse of UDM services and operations for SBA-based Sh interface
6.11  Solution 11: Procedure for UE to route IMS traffic via multiple 5GC network slices to the same IMS network
6.12  Solution 12: New SBA services dedicated for Cx Operations
6.13  Solution 13: Reuse services and operations of UDM and NRF for SBA-based Cx interface
6.14  Solution 14: IMS utilize services provided by Npcf
6.15  Solution 15: IMS utilize services provided by AMF
6.16  Solution 16: Enabling SBI-based Sh Using New ServiceWord-p. 55
6.17  Solution 17: Slicing information carried in the IMS registration and for T-ADS
6.18  Solution 18: NRF based P-CSCF discoveryWord-p. 63
6.19  Solution 19: IMS signalling and media of an application through one 5GC slice
6.20  Solution 20: Selection of Rx or N5 based on P-GW trunk id.
6.21  Solution 21: Selection of Nx or N5 based on UE Contact IP address
6.22  Solution 22: IMS services for SBA-based Cx interface
6.23  Solution 23: IMS services for SBA-based Sh interface
6.24  Solution 24: PCF discovery and selection for IMS
6.25  Solution 25: Selection of Nx or N5 based on two different P-CSCF FQDN/IP@
6.26  Solution 26: Use of NRF for User identity to HSS resolutionWord-p. 76
7  Overall EvaluationUp
8  ConclusionsWord-p. 82
A  Change historyWord-p. 84

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