Section: 6.5.2.6 Abnormal cases on the network side
Content: The following abnormal cases can be identified: a) No PDN connection with the linked EPS bearer identity activated: If the linked EPS bearer identity included in the PDN DISCONNECT REQUEST message does not belong to the default EPS bearer context of an established PDN connection, the MME shall reply with a PDN DISCONNECT REJECT message with ESM cause #43 "invalid EPS bearer identity". b) PDN DISCONNECT REQUEST message received from a UE which is in a location where the PLMN is not allowed to operate If the MME determines that the UE is in a location where the PLMN is not allowed to operate, the MME discards the message.