Section: 4.7.5.1.4a Routing area updating procedure for initiating a PDN connection for emergency bearer services not accepted by the network (UTRAN Iu mode only)
Content: If the routing area updating request for initiating a PDN connection for emergency bearer services cannot be accepted by the network, the MS shall perform the procedures as described in subclause 4.7.5.1.4. Then if the MS is in the same selected PLMN where the last routing area updating was attempted, the MS shall: a) inform the upper layers of the failure of the procedure; or NOTE 1: This can result in the upper layers requesting establishment of a CS emergency call (if not already attempted in the CS domain) or other implementation specific mechanisms, e.g. procedures specified in 3GPP TS 24.229[ IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3 ]  [95] that can result in the emergency call being attempted to another IP-CAN. b) detach locally, if not detached already, attempt GPRS attach for emergency bearer services. If the routing area updating request for initiating a PDN connection for emergency bearer services fails due to abnormal case a) in subclause 4.7.5.1.5, the MS shall perform the procedures as described in subclause 4.7.5.1.5 and inform the upper layers of the failure to access the network. NOTE 2: This can result in the upper layers requesting establishment of a CS emergency call (if not already attempted in the CS domain) or other implementation specific mechanisms, e.g. procedures specified in 3GPP TS 24.229[ IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3 ]  [95] that can result in the emergency call being attempted to another IP-CAN. If the routing area updating request for initiating a PDN connection for emergency bearer services fails due to abnormal cases b), c) or d) in subclause 4.7.5.1.5, the MS shall perform the procedures as described in subclause 4.7.5.1.5. Then if the MS is in the same selected PLMN where the last routing area updating was attempted, the MS shall: a) inform the upper layers of the failure of the procedure; or NOTE 3: This can result in the upper layers requesting establishment of a CS emergency call (if not already attempted in the CS domain) or other implementation specific mechanisms, e.g. procedures specified in 3GPP TS 24.229[ IP multimedia call control protocol based on Session Initiation Protocol (SIP) and Session Description Protocol (SDP); Stage 3 ]  [95] that can result in the emergency call being attempted to another IP-CAN. b) detach locally, if not detached already, attempt GPRS attach for emergency bearer services.