Information notification method, RRC connection release control method and apparatuses

The invention discloses an information notification method, a core network apparatus, a RRC connection release control method and a radio access network (RAN) side apparatus which are used for effectively transmitting a small quantity of data generated by a machine-type communication (MTC) device and reducing signaling overhead consumed by the transmission of the small quantity of data. The information notification method comprises the following steps that: the core network apparatus obtains the mobile information of user equipment (UE); and the core network apparatus notifies the radio access network (RAN) side apparatus serving for the user equipment (UE) with the mobile information of the user equipment (UE).