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TR 23.771 (SA2)
Study on System impacts of
IMS Emergency Sessions over WLAN

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Rapporteur:  Mr. Thiebaut, Laurent
See also:

The present document studies the mechanisms needed to support IMS Emergency sessions over WLAN (both in the Trusted -S2a - and in the untrusted -S2b- cases).

full Table of Contents for  TR 23.771  Word version:   13.0.0

 

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1  ScopeWord-p. 7
2  References
3  Definitions and abbreviationsWord-p. 8
4  Architectural assumptions
5  Key issuesWord-p. 10
6  SolutionsWord-p. 15
6.1  Solution 1: ePDG selection when UE can detect being in the home country
6.2  Solution 2: ePDG selection when the UE cannot know it is in Home CountryUp
6.3  Solution 3 for key issue #3: UPLI via SIP for untrusted WLANWord-p. 16
6.4  Solution 4 for key issue #3: UPLI via EPC for untrusted WLAN
6.5  Solution 5 for key issue #3: UPLI via IKEV2 for untrusted WLAN
6.6  Solution 6 for key issue #3: UPLI to OMA serverWord-p. 17
6.7  Solution 7 for key issue #3: UPLI to OMA server (fallback use case)
6.8  Solution 8: Location information from LRF for s2a
6.9  Solution 9: Handling of UE multiple provided location informationWord-p. 20
6.10  Solution 10: Location Information Included in SIP Register
6.11  Solution 11: Determine Emergency Call NumbersWord-p. 21
6.12  Solution 12: Select a WLAN for Emergency Services
6.13  Solution 13: Determine Location & Country InfoWord-p. 22
6.14  Solution 14: Overall procedure
6.15  Solution 15: Authenticated UE leveraging indication of ePDG/TWAN support for emergency servicesWord-p. 24
6.16  Solution 16: Support of emergency services by TWAN
6.17  Solution 17: Support of Mobility with 3GPP access (EPC).Word-p. 28
6.18  Solution 18 for Key issue 3: ePDG Push of location information to LRF/LS at emergency attachment/De-attachmentWord-p. 33
6.19  Solution 19: Support of emergency services for un-authenticated UEWord-p. 34
6.20  Solution 20: Support of emergency services for un-authenticated UE on S2b
6.21  Solution 21: Access Selection for Emergency SessionsWord-p. 45
6.22  Solution 22: Local Emergency Numbers List over WLAN accessWord-p. 46
6.23  Solution 23 for Key issue 3: Using the emergency signalling channel for on-demand UE Location update mid-session.
6.24  Solution 24: ePDG selection for emergency bearer servicesWord-p. 47
6.25  Solution 25 for Key issue 3: Network Initiated IKE-based WiFi Query for on-demand UE Location mid-emergency session.Word-p. 50
6.26  Solution 26 for Key Issue 1: ePDG Selection for emergency servicesWord-p. 51
6.27  Solution 27 for Key issue 3: NPLI for Untrusted WiFi emergency sessions
6.28  Solution 28: ePDG Selection for emergency services in phase 2Word-p. 52
6.29  Solution 29 for Key Issue 12: handover of an active emergency call from WLAN to 3GPP CS with E-STN-DRWord-p. 56
6.30  Solution 30 for Key issue 3: TWAG Push of location information to LRF/LS at emergency attachment/De-attachmentWord-p. 58
6.31  Solution 31: EIR check reusing the same Principle than in case of regular sessions
6.32  Solution 32: High level principles for emergency ePDG selection reusing the solution defined for regular ePDG selectionWord-p. 59
7  Overall evaluationWord-p. 60
8  ConclusionsWord-p. 62
A  Change historyWord-p. 64

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