Section: 6.4.4.4 Abnormal cases in the UE
Content: The following abnormal case can be identified: a) UE is requested to deactivate a default EPS bearer context of the last PDN connection: If EMM-REGISTERED without PDN connection is not supported by the UE or the MME, and the UE determines that the EPS bearer indicated in the DEACTIVATE EPS BEARER CONTEXT REQUEST message is the default EPS bearer of the last PDN connection that the UE has, then the UE shall respond by performing a detach procedure. Additionally, the UE should perform an attach procedure. If EMM-REGISTERED without PDN connection is supported by the UE and the MME, the UE shall proceed with the deactivation procedure as specified in clause 6.4.4.3. NOTE: User interaction is necessary in some cases when the UE cannot re-activate the EPS bearer(s), if any, automatically.