Section: 6.1.3.8.2.3 Handling of network rejection due to SM cause other than SM cause #26
Content: If the SM cause value is different from #26 "insufficient resources", and the Back-off timer value IE is included, the MS shall take different actions depending on the timer value received in the Back-off timer value IE: i) if the timer value indicates neither zero nor deactivated, the MS shall start the back-off timer with the value provided in the Back-off timer value IE for the MBMS context activation procedure and PLMN and APN combination. The MS shall not send another ACTIVATE MBMS CONTEXT REQUEST message in the PLMN for the same APN that was sent by the MS until the back-off timer expires, the MS is switched off or the SIM/USIM is removed; ii) if the timer value indicates that this timer is deactivated, the MS shall not send another ACTIVATE MBMS CONTEXT REQUEST message in the PLMN for the same APN that was sent by the MS until the MS is switched off or the SIM/USIM is removed; and iii) if the timer value indicates that this timer is zero, the MS may send an ACTIVATE MBMS CONTEXT REQUEST message in the PLMN for the same APN. If the Back-off timer value IE is not included, then the MS shall ignore the Re-attempt indicator IE provided by the network, if any. i) Additionally, if the SM cause value is #8 "operator determined barring", #27 "missing or unknown APN", #32 "service option not supported", or #33 "requested service option not subscribed", the MS shall proceed as follows: - if the MS is registered in its HPLMN or in a PLMN that is within the EHPLMN list (if the EHPLMN list is present), the MS shall behave as described above in the present subclause, using the configured SM_RetryWaitTime value 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], if available, as back-off timer value; and - otherwise, if the MS is not registered in its HPLMN or in a PLMN that is within the EHPLMN list (if the EHPLMN list is present), or if the SM_RetryWaitTime value is not configured, the MS shall behave as described above in the present subclause using the default value of 12 minutes for the back-off timer. ii) For SM cause values different from #8 "operator determined barring", #27 "missing or unknown APN", #32 "service option not supported", or #33 "requested service option not subscribed", the MS behaviour regarding the start of a back-off timer is unspecified. The MS shall not stop any back-off timer upon a PLMN change or inter-system change. If the network indicates that a back-off timer for the MBMS context activation procedure and PLMN and APN combination is deactivated, then it remains deactivated upon a PLMN change or inter-system change. NOTE 1: This means the back-off timer can still be running or be deactivated for the given SM procedure and PLMN and APN combination when the MS returns to the PLMN or when it performs inter-system change back from S1 mode to A/Gb or Iu mode. Thus the MS can still be prevented from sending another ACTIVATE MBMS CONTEXT REQUEST message in the PLMN for the same APN. If the back-off timer is started upon receipt of an ACTIVATE MBMS CONTEXT REJECT message (i.e. the timer value was provided by the network, a configured value is available or the default value is used as explained above) or the back-off timer is deactivated, the MS behaves as follows: i) after a PLMN change the MS may send an ACTIVATE MBMS CONTEXT REQUEST message for the same APN in the new PLMN, if the back-off timer is not running and is not deactivated for the MBMS context activation procedure and the combination of new PLMN and APN; Furthermore as an implementation option, for the SM cause values #8 "operator determined barring", #27 "missing or unknown APN", #32 "service option not supported" or #33 "requested service option not subscribed", if the network does not include a Re-attempt indicator IE, the MS may decide not to automatically send another ACTIVATE MBMS CONTEXT REQUEST message for the same APN, if the MS registered to a new PLMN which is in the list of equivalent PLMNs. ii) if the network includes the Re-attempt indicator IE, the MS shall ignore any indication provided in the IE regarding whether re-attempt in S1 mode is allowed. If the Re-attempt indicator IE indicates that re-attempt in an equivalent PLMN is not allowed, then depending on the timer value received in the Back-off timer value IE, for each combination of a PLMN from the equivalent PLMN list and the APN the MS shall start a back-off timer for the MBMS context activation procedure with the value provided by the network, or deactivate the respective back-off timer. NOTE 2: The back-off timer is used to describe a logical model of the required MS behaviour. This model does not imply any specific implementation, e.g. as a timer or timestamp. NOTE 3: Reference to back-off timer in this section can either refer to use of timer T3396 or to use of a different packet system specific timer within the MS. Whether the MS uses T3396 as a back-off timer or it uses different packet system specific timers as back-off timers is left up to MS implementation. This back-off timer is stopped when the MS is switched off or the SIM/USIM is removed.