4.7.15 GMM eCall inactivity procedure

24.0083GPPCore network protocolsMobile radio interface Layer 3 specificationRelease 18Stage 3TS

The GMM eCall inactivity procedure is applicable only to an eCall only mobile station (as determined by information configured in USIM) that is capable of eCall over IMS and attached for GPRS services. The procedure shall be started when:

– the mobile station is in PMM-IDLE mode (Iu mode) or packet idle mode;

– the mobile station is in MM IDLE state;

– the mobile station is in any GMM-REGISTERED substate except GMM-REGISTERED.NO-CELL-AVAILABLE or GMM-REGISTERED.PLMN-SEARCH; and

– one of the following conditions applies:

– timer T3242 expires or is found to have already expired and timer T3243 is not running;

– timer T3243 expires or is found to have already expired and timer T3242 is not running; or

– timers T3242 and T3243 expire or have found to have already expired.

The mobile station shall then stop other running timers (e.g. T3311, T3312) and shall:

– if the mobile station is also attached for non-GPRS services and the network operates in network operation mode I, perform a combined GPRS detach procedure for GPRS and non-GPRS services;

– if the mobile station is also attached for non-GPRS services and the network operates in network operation mode II, perform a GPRS detach procedure for GPRS services and an IMSI detach procedure; and

– if the mobile station is not attached for non-GPRS services, perform a GPRS detach procedure for GPRS services.

The mobile station shall then enter MM Idle eCALL INACTIVE state, delete any LAI, TMSI, ciphering key sequence number stored in the SIM/USIM, delete any RAI, P-TMSI, P-TMSI signature and GPRS ciphering key sequence number stored, delete any GUTI, TAI list, last visited registered TAI, list of equivalent PLMNs, KSI and set the update state to U4 Updating Disabled.

While in eCALL INACTIVE state, the mobile station shall behave as specified in subclause 4.4.7.