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When AMF release the NAS signalling connection, ran_ue context is removed by ran_ue_remove() and amf_ue/ran_ue is de-associated by amf_ue_deassociate(). In this case, implicit deregistration is attempted by the mobile reachable timer according to the standard document, and amf_ue will be removed by amf_ue_remove(). TS 24.501 5.3.7 Handling of the periodic registration update timer and Start AMF_TIMER_MOBILE_REACHABLE mobile reachable timer The network supervises the periodic registration update procedure of the UE by means of the mobile reachable timer. If the UE is not registered for emergency services, the mobile reachable timer shall be longer than the value of timer T3512. In this case, by default, the mobile reachable timer is 4 minutes greater than the value of timer T3512. The mobile reachable timer shall be reset and started with the value as indicated above, when the AMF releases the NAS signalling connection for the UE.
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