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Content for  TR 23.771  Word version:  13.0.0

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5  Key issuesp. 10

5.1  Key Issue #1: ePDG Selection for emergency servicesp. 10

5.2  Key Issue 2: Providing priority to emergency services especially in case of control plane congestionp. 10

5.3  Key Issue 3: providing location information to IMS nodesp. 10

5.4  Key Issue 4: Location Privacyp. 11

5.5  Key Issue 5: Location at Initial Connection for Voice Servicep. 11

5.6  Key Issue 6: Determination of Emergency Call Supportp. 11

5.7  Key Issue 7: Determine if TWAN supports emergency servicep. 11

5.8  Key Issue 8: Support of unauthenticated emergency session over Trusted WLANp. 11

5.9  Key Issue 9: Support of "unauthenticated" emergency session over Untrusted WLANp. 12

5.10  Key Issue 10: Support for IMS based Non-Voice Emergency Servicesp. 12

5.11  Key Issue 11: Means by which the order in which an emergency session is attempted over the available networksp. 13

5.12  Key Issue 12: Handover Active Emergency call from WLAN to 3GPPp. 13

5.13  Key Issue 13: Handover Active Emergency call from 3GPP to WLANp. 13

5.14  Key Issue 14: Determine if ePDG supports emergency servicep. 14

5.15  Key Issue 15: Stay connected to an ePDG that supports emergency servicep. 14

5.16  Key issue 16: Determine Emergency Call Numbersp. 14

5.17  Key issue 17: IMEI checkp. 14

6  Solutionsp. 15

6.1  Solution 1: ePDG selection when UE can detect being in the home countryp. 15

6.2  Solution 2: ePDG selection when the UE cannot know it is in Home Countryp. 15

6.3  Solution 3 for key issue #3: UPLI via SIP for untrusted WLANp. 16

6.3.1  Overviewp. 16

6.4  Solution 4 for key issue #3: UPLI via EPC for untrusted WLANp. 16

6.4.1  Overviewp. 16

6.5  Solution 5 for key issue #3: UPLI via IKEV2 for untrusted WLANp. 16

6.6  Solution 6 for key issue #3: UPLI to OMA serverp. 17

6.7  Solution 7 for key issue #3: UPLI to OMA server (fallback use case)p. 17

6.8  Solution 8: Location information from LRF for s2ap. 17

6.9  Solution 9: Handling of UE multiple provided location informationp. 20

6.10  Solution 10: Location Information Included in SIP Registerp. 20

6.10.1  Overviewp. 20

6.11  Solution 11: Determine Emergency Call Numbersp. 21

6.12  Solution 12: Select a WLAN for Emergency Servicesp. 21

6.13  Solution 13: Determine Location & Country Infop. 22

6.14  Solution 14: Overall procedurep. 22

6.15  Solution 15: Authenticated UE leveraging indication of ePDG/TWAN support for emergency servicesp. 24

6.16  Solution 16: Support of emergency services by TWANp. 26

6.17  Solution 17: Support of Mobility with 3GPP access (EPC).p. 28

6.18  Solution 18 for Key issue 3: ePDG Push of location information to LRF/LS at emergency attachment/De-attachmentp. 33

6.19  Solution 19: Support of emergency services for un-authenticated UEp. 34

6.20  Solution 20: Support of emergency services for un-authenticated UE on S2bp. 43

6.21  Solution 21: Access Selection for Emergency Sessionsp. 45

6.22  Solution 22: Local Emergency Numbers List over WLAN accessp. 46

6.23  Solution 23 for Key issue 3: Using the emergency signalling channel for on-demand UE Location update mid-session.p. 46

6.24  Solution 24: ePDG selection for emergency bearer servicesp. 47

6.25  Solution 25 for Key issue 3: Network Initiated IKE-based WiFi Query for on-demand UE Location mid-emergency session.p. 50

6.26  Solution 26 for Key Issue 1: ePDG Selection for emergency servicesp. 51

6.27  Solution 27 for Key issue 3: NPLI for Untrusted WiFi emergency sessionsp. 51

6.28  Solution 28: ePDG Selection for emergency services in phase 2p. 52

6.29  Solution 29 for Key Issue 12: handover of an active emergency call from WLAN to 3GPP CS with E-STN-DRp. 56

6.30  Solution 30 for Key issue 3: TWAG Push of location information to LRF/LS at emergency attachment/De-attachmentp. 58

6.31  Solution 31: EIR check reusing the same Principle than in case of regular sessionsp. 58

6.32  Solution 32: High level principles for emergency ePDG selection reusing the solution defined for regular ePDG selectionp. 59

7  Overall evaluationp. 60

8  Conclusionsp. 62

$  Change Historyp. 64


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