Section: 4.7.5.1 Normal and periodic routing area updating procedure
Content: Periodic routing area updating is used to periodically notify the availability of the MS to the network. The value of the update type IE in the ROUTING AREA UPDATE REQUEST message shall indicate "periodic updating". The procedure is controlled in the MS by timer T3312. When timer T3312 expires, the periodic routing area updating procedure is started. Start and reset of timer T3312 is described in subclause 4.7.2.2. The normal routing area updating procedure is initiated: - when the MS detects a change of the routing area in state GMM-REGISTERED; - when the MS determines that GPRS resumption shall be performed; - when the MS needs to update the network with the new MS Radio Access Capability IE; - when the MS needs to update the network with the new DRX parameter IE; - in Iu mode, to re-synchronize the PMM mode of MS and network after RRC connection release with cause "Directed signalling connection re-establishment", see subclause 4.7.2.5; - in Iu mode, to re-synchronize the PMM mode of MS and network after inter-system change not due to PS handover from PMM-CONNECTED mode in Iu mode to A/Gb mode or S1 mode, if the MS performs an inter - system change back to Iu mode without sending a ROUTING AREA UPDATE REQUEST message while in A/Gb mode or a TRACKING AREA UPDATE REQUEST message while in S1 mode; - in Iu mode and A/Gb mode, after intersystem change from S1 mode, and the GMM receives an indication of "RRC connection failure" from lower layers due to lower layer failure while in S1 mode. In this case, if the TIN indicates "RAT-related TMSI", the MS shall set the TIN to "GUTI" before initiating the routing area updating procedure; - in A/Gb mode, after intersystem change from S1 mode if the TIN indicates "RAT-related TMSI", but the MS is required to perform routing area updating for IMS voice termination as specified in annex P.4; - when the MS enters GMM-REGISTERED.NORMAL-SERVICE and the TIN indicates "GUTI"; - when the MS has selected a CSG cell whose CSG identity and associated PLMN identity are not included in the Allowed CSG list;or in the Operator CSG list; - when the MS supports SRVCC and changes the mobile station classmark 2, mobile station classmark 3 or the supported codecs; - when the MS changes the MS network capability information; - when the UE's usage setting or the voice domain preference for E-UTRAN change in the MS; - when the MS activates mobility management for IMS voice termination as specified in annex P.2 and the TIN indicates "RAT-related TMSI"; - upon reception of a paging indication, using P-TMSI, if the timer T3346 is running and the MS is in state GMM-REGISTERED.ATTEMPTING-TO-UPDATE and the RAI of the current cell is same as the stored RAI; - in A/Gb mode, after intersystem change from S1 mode via cell change order procedure not due to CS fallback, if the TIN indicates "RAT-related TMSI"; in this case the MS shall set the TIN to "GUTI" before initiating the routing area updating procedure; - in A/Gb or Iu mode in NMO I, after intersystem change from S1 mode due to CS fallback, if the TIN indicates "GUTI" or if the routing area the MS is in is different from the registered routing area; - in A/Gb mode, after Inter RAT handover from S1 mode or Iu mode; - when the MS needs to request the use of PSM or needs to stop the use of PSM; - when the MS needs to request the use of eDRX or needs to stop the use of eDRX; - when a change in the PSM usage conditions at the MS requires a different timer T3312 value or different timer T3324 value; - when a change in the eDRX usage conditions at the MS requires different extended DRX parameters; or NOTE 1: A change in the PSM or eDRX usage conditions at the MS can include e.g. a change in the MS configuration, a change in requirements from upper layers or the battery running low at the MS. - when the Default_DCN_ID value changes, as specified in 3GPP TS 24.368[ Non-Access Stratum (NAS) configuration Management Object (MO) ]  [135] or in USIM file NASCONFIG as specified in 3GPP TS 31.102[ Characteristics of the Universal Subscriber Identity Module (USIM) application ]  [112]. NOTE 2: The routing area updating procedure is initiated after deleting the DCN-ID list as specified in 3GPP TS 24.301[ Non-Access-Stratum (NAS) protocol for Evolved Packet System (EPS); Stage 3 ]  [120], annex C. The ROUTING AREA UPDATE REQUEST message shall always be the first data sent by the MS when a routing area border is crossed. The routing area identification is broadcast on the broadcast channel(s). A normal routing area updating shall abort any ongoing GMM procedure. Aborted GMM procedures may be repeated after the normal routing area updating procedure has been successfully performed. The value of the update type IE included in the message shall indicate "RA updating". If the normal routing area updating procedure is initiated due to the reception of the paging indication while timer T3346 is running, the "follow-on request pending" indication shall be set to 1.