Section: 6.1.3.3.3.2 Handling of network rejection due to SM cause #26
Content: If the SM cause value is #26 and the Back-off timer value IE is included, the MS shall ignore the Re-attempt indicator IE provided by the network, if any, and take different actions depending on the timer value received for timer T3396 in the Back-off timer value IE (if the MS is configured for dual priority, exceptions are specified in subclause 6.1.3.12; if the MS is an MS configured to use AC11 – 15 in selected PLMN, exceptions are specified in subclause 6.1.3.11): i) if the timer value indicates neither zero nor deactivated, the MS shall stop timer T3396 associated with the corresponding APN, if it is running. The MS shall then start timer T3396 with the value provided in the Back-off timer value IE and not send another ACTIVATE PDP CONTEXT REQUEST, ACTIVATE SECONDARY PDP CONTEXT REQUEST or MODIFY PDP CONTEXT REQUEST message with exception of those identified in subclause 6.1.3.3, for the same APN until timer T3396 expires or timer T3396 is stopped. If the MS did not send an APN for the establishment of the PDN connection and the request type was different from "emergency", the MS shall stop timer T3396 associated with no APN, if it is running. The MS shall then start timer T3396 with the value provided in the Back-off timer value IE and not send another ACTIVATE PDP CONTEXT REQUEST without an APN and with request type different from "emergency", or another ACTIVATE SECONDARY PDP CONTEXT REQUEST or MODIFY PDP CONTEXT REQUEST message with exception of those identified in subclause 6.1.3.3, for a non-emergency PDN connection established without an APN sent by the MS, until timer T3396 expires or timer T3396 is stopped. The MS shall not stop timer T3396 upon a PLMN change or inter-system change; ii) if the timer value indicates that this timer is deactivated, the MS shall not send another ACTIVATE PDP CONTEXT REQUEST, ACTIVATE SECONDARY PDP CONTEXT REQUEST or MODIFY PDP CONTEXT REQUEST message with exception of those identified in subclause 6.1.3.3, for the same APN until the MS is switched off or the SIM/USIM is removed or the MS receives REQUEST PDP CONTEXT ACTIVATION, REQUEST SECONDARY PDP CONTEXT ACTIVATION or MODIFY PDP CONTEXT REQUEST message for the same APN or a DEACTIVATE PDP CONTEXT REQUEST message including SM cause #39 "reactivation requested" for a PDP context which was activated by the MS for the same APN from the network. If the MS did not send an APN for the establishment of the PDN connection and the request type was different from "emergency", the MS shall not send another ACTIVATE PDP CONTEXT REQUEST without an APN and with request type different from "emergency", or another ACTIVATE SECONDARY PDP CONTEXT REQUEST or MODIFY PDP CONTEXT REQUEST with exception of those identified in subclause 6.1.3.3, for a non-emergency PDN connection established without APN sent by the MS, until the MS is switched off or the SIM/USIM is removed or the MS receives any of the following messages: a REQUEST PDP CONTEXT ACTIVATION without an APN, a REQUEST SECONDARY PDP CONTEXT ACTIVATION or MODIFY PDP CONTEXT REQUEST message for a non-emergency PDN connection established without an APN sent by the MS, or a DEACTIVATE PDP CONTEXT REQUEST message including SM cause #39 "reactivation requested" for a PDP context which was activated by the MS for a non-emergency PDN connection established without an APN sent by the MS. The timer T3396 remains deactivated upon a PLMN change or inter-system change; or iii) if the timer value indicates that this timer is zero, the MS: - shall stop timer T3396 associated with the corresponding APN, if running, and may send an ACTIVATE PDP CONTEXT REQUEST, ACTIVATE SECONDARY PDP CONTEXT REQUEST or MODIFY PDP CONTEXT REQUEST message for the same APN; and - if the MS did not send an APN for the establishment of the PDN connection and the request type was different from "emergency", the MS shall stop timer T3396 associated with no APN, if running, and may send an ACTIVATE PDP CONTEXT REQUEST message without an APN, or another ACTIVATE SECONDARY PDP CONTEXT REQUEST or MODIFY PDP CONTEXT REQUEST message for a non-emergency PDN connection established without an APN sent by the MS. If the Back-off timer value IE is not included, the MS may send an ACTIVATE PDP CONTEXT REQUEST, ACTIVATE SECONDARY PDP CONTEXT REQUEST or MODIFY PDP CONTEXT REQUEST message for the same APN. If the timer T3396 is running when the MS enters state GMM-DEREGISTERED, the MS remains switched on, and the SIM/USIM in the MS remains the same, then timer T3396 is kept running until it expires or it is stopped. If the MS is switched off when the timer T3396 is running, and if the SIM/USIM in the MS remains the same when the MS is switched on, the MS behaves as follows: - let t1 be the time remaining for T3396 timeout at switch off and let t be the time elapsed between switch off and switch on. If t1 is greater than t, then the timer shall be restarted with the value t1 – t. If t1 is equal to or less than t, then the timer need not be restarted. If the MS is not capable of determining t, then the MS shall restart the timer with the value t1; and - if prior to switch off, timer T3396 was running because an ACTIVATE PDP CONTEXT REQUEST, ACTIVATE SECONDARY PDP CONTEXT REQUEST, MODIFY PDP CONTEXT REQUEST or ACTIVATE MBMS CONTEXT REQUEST message containing the low priority indicator set to "MS is configured for NAS signalling low priority" was rejected with a timer value for timer T3396, and if timer T3396 is restarted at switch on, then the MS configured for dual priority shall handle session management requests as indicated in subclause 6.1.3.12.