Section: 6.1.5 Coordination between ESM and EMM for supporting ISR
Content: The UE with its TIN set as "RAT-related TMSI" for which ISR is activated shall change its TIN to "GUTI" to locally deactivate ISR and stop the periodic routing area update timer T3312 or T3323, if running: - upon modification of any EPS bearer context which was activated before the ISR is activated in the UE; - at the time when the UE changes from S1 mode to A/Gb mode or Iu mode not due to PS handover procedure (see 3GPP TS 24.008[ Mobile radio interface Layer 3 specification; Core network protocols; Stage 3 ]  [13]), if any EPS bearer context activated after the ISR was activated in the UE exists; or - upon deactivation of the last non-emergency EPS bearer context in the UE, if the UE has only a PDN connection for emergency bearer services remaining. ISR remains activated on the network side in the above cases.