1. A method comprising:sending, by a base station, first signaling to a terminal device through a physical downlink shared channel (PDSCH), and sending, by the base station, second signaling to the terminal device through a downlink control channel, wherein the first signaling comprises a first time division duplexing (TDD) uplink-downlink configuration, the second signaling comprises a second TDD uplink-downlink configuration, and the downlink control channel is a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (ePDCCH);
when both the first signaling and the second signaling are sent to the terminal device, receiving, by the base station, random access message from the terminal device in a first uplink subframe within a first uplink subframe set of the first TDD uplink-downlink configuration; and
when both the first signaling and the second signaling are sent to the terminal device, after the terminal device accesses the base station,
receiving, by the base station from the terminal device, data in a second uplink subframe within a second uplink subframe set of the second TDD uplink-downlink configuration or
sending, by the base station to the terminal device, data in a first downlink subframe within a downlink subframe set of the second TDD uplink-downlink configuration.