Section: 4.7.1.9 Release of the PS signalling connection (Iu mode only)
Content: In Iu mode, to allow the network to release the PS signalling connection (see 3GPP TS 25.331[ None ]  [23c] and 3GPP TS 44.118[ None ]  [111]) the MS: a) shall start the timer T3340 if the MS receives any of the reject cause values #11, #12, #13, #15 or #25; b) shall start the timer T3340 if the network indicates "no follow-on proceed" in the ROUTING AREA UPDATE ACCEPT or ATTACH ACCEPT message and user plane radio access bearers have not been setup; c) shall start the timer T3340 if the MS receives a DETACH ACCEPT message and the MS has set the detach type to "IMSI detach" in the DETACH REQUEST message and user plane radio access bearers have not been set up; or d) may start the timer T3340 if the MS receives any of the reject cause values #3, #6, #7 or #8 or if it receives an AUTHENTICATION AND CIPHERING REJECT message. Upon expiry of T3340, the MS shall release the established PS signalling connection (see 3GPP TS 25.331[ None ]  [23c] and 3GPP TS 44.118[ None ]  [111]). Upon release of the established PS signalling connection, if timer T3243 is not running, the MS shall start timer T3243 when: - the MS is an eCall only MS (as determined by information configured in USIM); - the MS is capable of eCall over IMS; and - the PS signalling connection that was released had been established for a call to an HPLMN designated non-emergency MSISDN or URI for test or terminal reconfiguration service which was handed over from S1 mode. In case b, if the MS has signalling pending, then it shall request a new PS signalling connection for further signalling. In case b and c, - upon an indication from the lower layers that radio accesss bearer(s) is set up, the MS shall stop timer T3340 and may send uplink signalling via the existing PS signalling connection or user data via radio access bearer(s). If the MS is establishing a PDN connection for emergency bearer services or the MS is initiating a service request procedure to send user data for emergency bearer services, the MS shall send the uplink signalling via the existing PS signalling connection; - upon receipt of a REQUEST PDP CONTEXT ACTIVATION message, MODIFY PDP CONTEXT REQUEST message, DEACTIVATE PDP CONTEXT REQUEST message, REQUEST SECONDARY PDP CONTEXT ACTIVATION message or REQUEST MBMS CONTEXT ACTIVATION message, the MS shall stop timer T3340 and may send uplink signalling via the existing PS signalling connection. If the MS is establishing a PDN connection for emergency bearer services or the MS is initiating a service request procedure to send user data for emergency bearer services, the MS shall send the uplink signalling via the existing PS signalling connection; or - upon receipt of a DETACH REQUEST message, the MS shall stop timer T3340 and respond to the network initiated GPRS detach as specified in subclause 4.7.4.2. If the MS receives the "Extended wait time" for PS domain from the lower layers when no attach, routing area updating or service request procedure is ongoing, the MS shall ignore the "Extended wait time". If the MS needs to perform PLMN selection, the MS may release the established PS signalling connection (see 3GPP TS 25.331[ None ]  [23c] and 3GPP TS 44.118[ None ]  [111]).