Content for TS 23.167 Word version: 19.0.0
E Emergency support in different IP-CANs
F IMS Emergency Services Using HRPD/PDS Network
F.1 cdma2000 HRPD/PDS Options
F.2 Requirements on the HRPD Network as an IP-CAN
F.3 Information Flows
G TEL-URI provisioning considerations for IMS emergency call back
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E Emergency support in different IP-CANs p. 47
Support for emergency services in the IP Multimedia Core Network can be provided by certain IP-CANs according to Table E.1, which shows the level of possible emergency support in this version of the specification. The UE may be able to use also other IP-CANs that are not included in Table E.1 to access emergency services in the IP Multimedia Core Network, but the support of such access technologies is out of scope of this specification.
| IP-CAN | Normal Access |
Emergency support |
Insufficient Security Credentials |
|---|---|---|---|
| GPRS (UTRAN) | X | X | X |
| Fixed Broadband | X | X | X |
| cdma2000 HRPD/PDS | X | X | X |
| cdma2000 HRPD/EPC | X | X | X |
| EPS (UTRAN and E-UTRAN) | X | X | X |
| WLAN access to EPS | X (Note 1) | X | – |
| 5GS (NG-RAN) | X | X | X |
| non-3GPP access to 5GC | X (Note 1) | X | – |
|
NOTE 1:
Emergency Sessions use a normal access to EPC/5GC only in the case of emergency sessions not detected by the UE and nevertheless served by the IMS network.
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The term "normal access" in Table E.1 means that the IP-CAN is not made aware of the UE intent to establish an emergency services session and therefore provides no special emergency support e.g. call priority.
The term "emergency support" in the Table means that the IP-CAN is made aware of the UE intent to establish an emergency services session, or at least of the priority nature of the access, so that the access network is able to handle the emergency call with appropriate priority.
The term "insufficient security credentials" in the Table means that the IP CAN is able to allow a UE with no UICC card or a UICC card with insufficient credentials to obtain IP bearer access for emergency services in the IP Multimedia Core Network.
F (Normative) IMS Emergency Services Using HRPD/PDS Network p. 48
F.1 cdma2000 HRPD/PDS Options |R8| p. 48
The following options from the normative clauses of this TS are applicable in cdma2000 HRPD systems with a PDS core network:
- Clause 7.1.1, step 4 "The IP-CAN may support a UE indication that this request is for an emergency service".
- Clause 4.1 "The P-CSCF serving the emergency call is the IMS network entity which may retrieve the location identifier from the IP-CAN".
F.2 Requirements on the HRPD Network as an IP-CAN |R8| p. 48
For an emergency call over HRPD, the requirements on the IP-CAN are specified in 3GPP2 X.S0060 [25].
F.3 Information Flows |R8| p. 48
The informational flows for emergency calls over HRPD are provided in 3GPP2 X.S0060 [25].
G TEL-URI provisioning considerations for IMS emergency call back |R8| p. 49
In order to support emergency call-back from the PSTN or CS Domain:
- For a single or multiple device subscription that contain both a SIP-URI and TEL-URI in at least one implicit registration set for each device (including subscriptions that share SIP-URIs and TEL-URIs between devices), IMS emergency sessions can already be supported. If the user registers with a temporary public user identity (e.g. the subscription has a device containing a USIM) ensure that a TEL-URI is provisioned in the same implicit registration set as the temporary public user identity.
- For a multiple device subscription that has TEL-URIs for some devices but has one or more devices that are not assigned an implicit registration set containing a TEL-URI (e.g. because these devices in the subscription are not allowed to use a TEL-URI in normal originations), the existing TEL-URIs in the subscription cannot be shared between all devices for the purposes of IMS emergency sessions.
