Section: 4.4.7 eCall inactivity procedure
Content: The eCall inactivity procedure is applicable only to an eCall only mobile station (as determined by information configured in USIM). The procedure shall be started when: - the mobile station is in any MM Idle state except NO IMSI, NO CELL AVAILABLE or PLMN SEARCH; - the mobile station is in GMM-NULL or GMM-DEREGISTERED state; and - one of the following conditions applies: - timer T3242 expires or is found to have already expired and T3243 is not running; - timer T3243 expires or is found to have already expired and T3242 is not running; or - timer T3242 and timer T3243 expire or are found to have already expired. The mobile station shall then stop other running timers (e.g. T3211, T3212, T3213) and shall perform the IMSI detach procedure if required by the serving network and if the update state is U1. The mobile station then enters MM Idle eCALL INACTIVE state and the mobile station shall delete any LAI, TMSI, ciphering key sequence number stored in the SIM/USIM and set the update state to U4 Updating Disabled. While in eCALL INACTIVE state, the mobile station maintains awareness of a potential serving cell in a potential serving network but initiates no MM signalling with the network and ignores any paging requests. The mobile station shall leave eCALL INACTIVE state only when one of the following events occur: - if the SIM or USIM is removed, the mobile station enters the NO IMSI state; - if coverage is lost, the mobile station enters PLMN SEARCH state; - if the mobile station is deactivated (e.g. powered off) by the user: the mobile station enters the NULL state; - if there is a CM request for an emergency services call: the mobile station should follow the procedure for return to state MM-IDLE in subclause 4.2.3 and attempt a location update. The MS then uses the MM and CM procedures to establish the emergency call at the earliest opportunity; or NOTE 1: If an eCall only device has not successfully completed a location update procedure, PSAP callback will not be possible due to its calling line identity being unavailable at the PSAP. NOTE 2: An eCall only device uses the CS domain to originate an emergency services call when in A/Gb or Iu mode, even if the device is capable of eCall over IMS. - if there is a CM request for a call to an HPLMN designated non-emergency MSISDN for the purpose of accessing test and terminal reconfiguration services: the mobile station follows the procedure for return to state MM-IDLE in subclause 4.2.3 and attempts a normal location update. Once this is complete, further MM and CM procedures are used to establish the non-emergency call. NOTE 3: An eCall only device uses the CS domain to originate a call to an HPLMN designated non-emergency MSISDN for the purpose of accessing test and terminal reconfiguration services when in A/Gb or Iu mode, even if the device is capable of eCall over IMS.