A network node of the present invention transmits downlink data for user equipment using a paging message. The user equipment can transmit to the network node a radio resource control (RRC) connection request message including acknowledgement information that indicates acknowledgement of the downlink data if the paging message contains the downlink data for the user equipment. The network node can transmit to the user equipment an RRC connection refusal message including information that indicates confirmation with respect to the acknowledgement information if the paging message contains the downlink data for the user equipment and the RRC connection request message contains the acknowledgement information.