Content for TR 23.794 Word version: 17.0.0
5 Key Issues Word‑p. 10
5.1 Key Issue 1: Routing of IMS traffic via a localized UPF
5.2 Key Issue 2: Placement of IMS application server in localized environments
5.3 Key Issue 3: Network Slicing and IMS Word‑p. 11
5.4 Key Issue 4: Discovery of Network Functions Word‑p. 13
5.5 Key Issue 5: Enabling SBA-based Cx Word‑p. 14
5.6 Key Issue 6: Enabling SBA-based Sh
5.7 Key Issue 7: How can IMS utilize services provided by Npcf
5.8 Key Issue #8: How can IMS utilize services provided by 5GC NFs other than PCF Word‑p. 15
6 Solutions
6.1 Solution 1: Entire IMS in localized network
6.1.1 Description
6.1.1.1 General
6.1.1.2 Architecture
6.1.1.3 Determination of Localized Routing Word‑p. 16
6.1.1.4 Mobility Aspects
6.1.2 Impacts on existing nodes and functions Word‑p. 17
6.1.3 Solution Evaluation
6.2 Solution 2: IMS AS Influences routing of IMS media traffic as a 5G AF
6.2.1 Description
6.2.1.1 General
6.2.1.2 Architecture
6.2.1.3 Establishment Procedure Word‑p. 18
6.2.1.4 Mobility Aspects Word‑p. 19
6.2.2 Impacts on existing nodes and functions Word‑p. 20
6.2.3 Solution Evaluation
6.3 Solution 3: P-CSCF Influences routing of IMS media traffic as a 5G AF
6.3.1 Description
6.3.1.1 General
6.3.1.2 Architecture
6.3.1.3 Establishment Procedure Word‑p. 21
6.3.1.4 Mobility Aspects Word‑p. 22
6.3.2 Impacts on existing nodes and functions Word‑p. 23
6.3.3 Solution Evaluation
6.4 Solution 4: Multi-homing based PSA addition to the PDU Session for IMS for localized routing
6.4.1 Description
6.4.2 Impacts on existing nodes and functions Word‑p. 25
6.4.3 Solution Evaluation Word‑p. 26
6.5 Solution 5: Routing of IMS traffic via a localised UPF with two IP addresses
6.5.1 Description
6.5.2 Impacts on existing nodes and functions Word‑p. 27
6.5.3 Solution Evaluation
6.6 Solution 6: Routing of IMS traffic via a localised UPF with three IP addresses
6.6.1 Description
6.6.2 Impacts on existing nodes and functions Word‑p. 29
6.6.3 Solution Evaluation
6.7 Solution 7: IMS traffic local routing by applying AF influence mechanism
6.7.1 Description
6.7.2 Impacts on existing nodes and functions Word‑p. 31
6.7.3 Solution Evaluation
6.8 Solution 8: Application Function influence on network slice selection
6.8.1 Description
6.8.2 Impacts on existing nodes and functions Word‑p. 34
6.8.3 Solution Evaluation
6.9 Solution 9: Enhancements to Npcf services to support IMS functionality Word‑p. 35
6.9.1 Description
6.9.2 Impacts on existing nodes and functions Word‑p. 36
6.9.3 Solution Evaluation Word‑p. 37
6.10 Solution 10: Reuse of UDM services and operations for SBA-based Sh interface
6.10.1 Description
6.10.2 Impacts on existing nodes and functions Word‑p. 38
6.10.3 Solution Evaluation
6.11 Solution 11: Procedure for UE to route IMS traffic via multiple 5GC network slices to the same IMS network
6.11.1 Description
6.11.2 Impacts on existing nodes and functions Word‑p. 43
6.11.3 Solution Evaluation
6.12 Solution 12: New SBA services dedicated for Cx Operations
6.12.1 Solution overview
6.12.1.2 IMS Ncx Services Word‑p. 44
6.12.1.3 IMS procedure examples using SBA (Ncx Service Operations) Word‑p. 45
6.12.1.3.1 IMS Initial Registration Word‑p. 46
6.12.1.3.2 Subsequent IMS Registration Word‑p. 47
6.12.1.3.3 Network Initiated De-Registration
6.12.1.3.4 P-CSCF Restoration (HSS Option)/S-CSCF initiated Deregistration Word‑p. 48
6.12.1.4 IMS Ncx service Operations dedicated to Cx Word‑p. 49
6.12.2 Impacts on existing nodes and functions
6.12.3 Solution Evaluation
6.13 Solution 13: Reuse services and operations of UDM and NRF for SBA-based Cx interface
6.13.1 Description
6.13.2 Impacts on existing nodes and functions Word‑p. 52
6.13.3 Solution Evaluation
6.14 Solution 14: IMS utilize services provided by Npcf
6.14.1 Description
6.14.2 Impacts on existing nodes and functions Word‑p. 53
6.14.3 Solution Evaluation
6.15 Solution 15: IMS utilize services provided by AMF
6.15.1 Description
6.15.2 Impacts on existing nodes and functions Word‑p. 54
6.15.3 Solution Evaluation
6.16 Solution 16: Enabling SBI-based Sh Using New Service Word‑p. 55
6.16.1 Description
6.16.1a Sh Data Parameters
6.16.1a.1 IMS subscription related data Word‑p. 56
6.16.1a.2 IMS subscriber context data Word‑p. 57
6.16.1a.3 IMS operational data
6.16.1a.4 IMS-AS Repository and vendor specific data
6.16.2 Mapping of Sh Procedure to SBA Services Word‑p. 58
6.16.3 Additional Requirements Word‑p. 60
6.16.4 Impacts on existing nodes and functions
6.16.5 Solution Evaluation
6.17 Solution 17: Slicing information carried in the IMS registration and for T-ADS
6.17.1 Description
6.17.2 Registration Procedure Word‑p. 61
6.17.3 MT Procedure Word‑p. 62
6.17.4 Impacts on existing nodes and functions
6.17.5 Solution Evaluation
6.18 Solution 18: NRF based P-CSCF discovery Word‑p. 63
6.18.1 Description
6.18.1A P-CSCF selection
6.18.2 Impacts on existing nodes and functions
6.18.3 Solution Evaluation Word‑p. 64
6.19 Solution 19: IMS signalling and media of an application through one 5GC slice
6.19.1 Description
6.19.2 Impacts on existing nodes and functions Word‑p. 66
6.19.3 Solution Evaluation
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
6.22.1 Description
6.22.2 Impacts on existing nodes and functions Word‑p. 70
6.22.3 Solution Evaluation Word‑p. 71
6.23 Solution 23: IMS services for SBA-based Sh interface
6.23.1 Description
6.23.2 Impacts on existing nodes and functions Word‑p. 73
6.23.3 Solution Evaluation Word‑p. 74
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 resolution Word‑p. 76
7 Overall Evaluation
7.1 Evaluation of solutions addressing key issue #5
7.2 Evaluation of solutions addressing key issue #6 Word‑p. 81
8 Conclusions Word‑p. 82
8.1 Conclusions Related to Key Issue #4
8.2 Conclusions for Key Issue #5 and Key Issue #6
8.3 Conclusions Related to Key Issue #7
8.4 Conclusions Related to Key Issues #1, #2, #3 and #8 Word‑p. 83
$ Change History Word‑p. 84
