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

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V13.0.0 (Wzip)  2016/06  64 p.

WI Acronym:  FS_SEW
Rapporteur:  Mr. Thiebaut, Laurent

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  ReferencesWord-p. 7
3  Definitions and abbreviationsWord-p. 8
4  Architectural assumptionsWord-p. 8
4.1  General architectural assumptionsWord-p. 8
4.2  Architectural assumptions for phase 1Word-p. 9
5  Key issuesWord-p. 10
5.1  Key Issue #1: ePDG Selection for emergency servicesWord-p. 10
5.2  Key Issue 2: Providing priority to emergency services especially in case of control plane congestionUpWord-p. 10
5.3  Key Issue 3: providing location information to IMS nodesWord-p. 10
5.4  Key Issue 4: Location PrivacyWord-p. 11
5.5  Key Issue 5: Location at Initial Connection for Voice ServiceWord-p. 11
5.6  Key Issue 6: Determination of Emergency Call SupportWord-p. 11
5.7  Key Issue 7: Determine if TWAN supports emergency serviceWord-p. 11
5.8  Key Issue 8: Support of unauthenticated emergency session over Trusted WLANWord-p. 11
5.9  Key Issue 9: Support of "unauthenticated" emergency session over Untrusted WLANWord-p. 12
5.10  Key Issue 10: Support for IMS based Non-Voice Emergency ServicesUpWord-p. 12
5.11  Key Issue 11: Means by which the order in which an emergency session is attempted over the available networksWord-p. 13
5.12  Key Issue 12: Handover Active Emergency call from WLAN to 3GPPWord-p. 13
5.13  Key Issue 13: Handover Active Emergency call from 3GPP to WLANWord-p. 13
5.14  Key Issue 14: Determine if ePDG supports emergency serviceWord-p. 14
5.15  Key Issue 15: Stay connected to an ePDG that supports emergency serviceWord-p. 14
5.16  Key issue 16: Determine Emergency Call NumbersWord-p. 14
5.17  Key issue 17: IMEI checkWord-p. 14
6  SolutionsWord-p. 15
6.1  Solution 1: ePDG selection when UE can detect being in the home countryWord-p. 15
6.2  Solution 2: ePDG selection when the UE cannot know it is in Home CountryUpWord-p. 15
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 WLANWord-p. 16
6.5  Solution 5 for key issue #3: UPLI via IKEV2 for untrusted WLANWord-p. 16
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)Word-p. 17
6.8  Solution 8: Location information from LRF for s2aWord-p. 17
6.9  Solution 9: Handling of UE multiple provided location informationWord-p. 20
6.10  Solution 10: Location Information Included in SIP RegisterWord-p. 20
6.11  Solution 11: Determine Emergency Call NumbersWord-p. 21
6.12  Solution 12: Select a WLAN for Emergency ServicesWord-p. 21
6.13  Solution 13: Determine Location & Country InfoWord-p. 22
6.14  Solution 14: Overall procedureWord-p. 22
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 TWANWord-p. 26
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 S2bWord-p. 43
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.Word-p. 46
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 sessionsWord-p. 51
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 sessionsWord-p. 58
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
7.1  Overall evaluation for phase 1 (FS_SEW1)Word-p. 60
7.2  Overall evaluation for phase 2 (FS_SEW2)Word-p. 60
8  ConclusionsWord-p. 62
8.1  Conclusions for phase 1 (FS_SEW1)Word-p. 62
8.2  Conclusions for phase 2 (FS_SEW2)UpWord-p. 62
A  Change historyWord-p. 64

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