Section: 6.5.3.6 Abnormal cases on the network side
Content: The following abnormal case can be identified: a) No PDN connection with the linked EPS bearer identity activated: If the linked EPS bearer identity included in the BEARER RESOURCE ALLOCATION REQUEST message does not belong to the default EPS bearer context of an established PDN connection, the MME shall reply with a BEARER RESOURCE ALLOCATION REJECT message with ESM cause #43 "invalid EPS bearer identity". b) BEARER RESOURCE ALLOCATION REQUEST message received for a PDN connection established for emergency bearer services: The MME shall reply with a BEARER RESOURCE ALLOCATION REJECT message with ESM cause #31 "request rejected, unspecified". c) BEARER RESOURCE ALLOCATION 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.