A method for transmitting downlink data, comprising: generating, by a base station, on reception of downlink traffic data sent by a core network to a user equipment in a light connection state, a triggering message based on an identifier of the user equipment in the LC state; and controlling, by the base station, based on the triggering message, the user equipment in the LC state to recover to a connection state; wherein the step of generating the triggering message based on the identifier of the user equipment in the LC state comprises: generating, based on the identifier of the user equipment in the LC state, an enhanced paging message comprising the identifier of the user equipment in the LC state; wherein the step of generating, based on the identifier of the user equipment in the LC state, the enhanced paging message comprising the identifier of the user equipment in the LC state comprises: generating the enhanced paging message by carrying the identifier of the user equipment in the LC state in a downlink control channel or in a downlink shared channel; and wherein the step of generating the enhanced paging message by carrying the identifier of the user equipment in the LC state in the downlink control channel or in the downlink shared channel comprises: taking the identifier of the user equipment in the LC state as a content of the downlink control channel, and scrambling the content of the downlink control channel using a preset scramble code, to generate the enhanced paging message; or scrambling the downlink control channel using the identifier of the user equipment in the LC state as a scramble code, to generate the enhanced paging message; or taking the identifier of the user equipment in the LC state as a content of the downlink shared channel, scrambling a downlink control channel using a preset scramble code, and performing a scheduling through the scrambled downlink control channel, to generate the enhanced paging message. generating, by a base station, on reception of downlink traffic data sent by a core network to a user equipment in a light connection state, a triggering message based on an identifier of the user equipment in the LC state; and controlling, by the base station, based on the triggering message, the user equipment in the LC state to recover to a connection state; wherein the step of generating the triggering message based on the identifier of the user equipment in the LC state comprises: generating, based on the identifier of the user equipment in the LC state, an enhanced paging message comprising the identifier of the user equipment in the LC state; wherein the step of generating, based on the identifier of the user equipment in the LC state, the enhanced paging message comprising the identifier of the user equipment in the LC state comprises: generating the enhanced paging message by carrying the identifier of the user equipment in the LC state in a downlink control channel or in a downlink shared channel; and wherein the step of generating the enhanced paging message by carrying the identifier of the user equipment in the LC state in the downlink control channel or in the downlink shared channel comprises: taking the identifier of the user equipment in the LC state as a content of the downlink control channel, and scrambling the content of the downlink control channel using a preset scramble code, to generate the enhanced paging message; or scrambling the downlink control channel using the identifier of the user equipment in the LC state as a scramble code, to generate the enhanced paging message; or taking the identifier of the user equipment in the LC state as a content of the downlink shared channel, scrambling a downlink control channel using a preset scramble code, and performing a scheduling through the scrambled downlink control channel, to generate the enhanced paging message. taking the identifier of the user equipment in the LC state as a content of the downlink control channel, and scrambling the content of the downlink control channel using a preset scramble code, to generate the enhanced paging message; or scrambling the downlink control channel using the identifier of the user equipment in the LC state as a scramble code, to generate the enhanced paging message; or taking the identifier of the user equipment in the LC state as a content of the downlink shared channel, scrambling a downlink control channel using a preset scramble code, and performing a scheduling through the scrambled downlink control channel, to generate the enhanced paging message.