Section: 5.6.1.6 Service request procedure for initiating an emergency PDU session not accepted by the network
Content: If the service request for initiating an emergency PDU session cannot be accepted by the network, the UE shall perform the procedures as described in subclause 5.6.1.5. If the service request for initiating an emergency PDU session fails due to receiving the AUTHENTICATION REJECT message, the UE shall perform the procedures as described in subclauses 5.4.1.2.2.11, 5.4.1.2.3.1, 5.4.1.2.3A.1 or 5.4.1.3.5. Then if the UE is in the same selected PLMN where the last service request was attempted, the UE shall: a) inform the upper layers of the failure of the procedure; or NOTE 1: This can result in the upper layers requesting another emergency call attempt using domain selection as specified in 3GPP TS 23.167[ IP Multimedia Subsystem (IMS) emergency sessions ]  [6]. b) de-register locally, if not de-registered already, attempt initial registration for emergency services. If the service request for initiating an emergency PDU session fails due to abnormal cases a), f) or l) in subclause .7, the UE shall perform the procedures as described in subclause 5.6.1.7. Then if the UE is in the same selected PLMN where the last SERVICE REQUEST message was attempted, the UE shall: a) inform the upper layers of the failure of the procedure; or NOTE 2: This can result in the upper layers requesting another emergency call attempt using domain selection as specified in 3GPP TS 23.167[ IP Multimedia Subsystem (IMS) emergency sessions ]  [6] and 3GPP TS 24.229[ IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3 ]  [14]. b) de-register locally, if not de-registered already, attempt initial registration for emergency services. If the service request for initiating a PDU session for emergency services fails due to abnormal case b) in subclause 5.6.1.7, the UE shall perform the actions as described in subclause 5.6.1.7 and inform the upper layers of the failure to access the network. NOTE 3: This can result in the upper layers requesting another emergency call attempt using domain selection as specified in 3GPP TS 23.167[ IP Multimedia Subsystem (IMS) emergency sessions ]  [6].