A communications apparatus for a time division duplexing long term evolution, TDD LTE, system, comprising: a processing module, configured to determine a frame structure of a serving cell, wherein in the determined frame structure of the serving cell, one radio frame comprises at least one first subframe, and the first subframe comprises: a first part comprising a symbol used for downlink transmission; a second part that is a guard period, GP; a third part that is a symbol used for uplink transmission, wherein the uplink transmission comprises uplink control information transmission; and a fourth part comprising a symbol used for downlink transmission or a symbol used for uplink transmission; and a transceiver module, configured to send and receive information in the serving cell according to the frame structure, determined by the processing module, of the serving cell; characterized in that the fourth part is located in a tail of the first subframe, wherein the first part is a symbol used for downlink control transmission and downlink data transmission; the third part is a symbol used for uplink control information transmission and/or sounding reference signal SRS transmission; and the fourth part is specifically a symbol used for downlink data transmission or a symbol used for uplink data transmission. a processing module, configured to determine a frame structure of a serving cell, wherein in the determined frame structure of the serving cell, one radio frame comprises at least one first subframe, and the first subframe comprises: a first part comprising a symbol used for downlink transmission; a second part that is a guard period, GP; a third part that is a symbol used for uplink transmission, wherein the uplink transmission comprises uplink control information transmission; and a fourth part comprising a symbol used for downlink transmission or a symbol used for uplink transmission; and a transceiver module, configured to send and receive information in the serving cell according to the frame structure, determined by the processing module, of the serving cell; characterized in that the fourth part is located in a tail of the first subframe, wherein the first part is a symbol used for downlink control transmission and downlink data transmission; the third part is a symbol used for uplink control information transmission and/or sounding reference signal SRS transmission; and the fourth part is specifically a symbol used for downlink data transmission or a symbol used for uplink data transmission. a first part comprising a symbol used for downlink transmission; a second part that is a guard period, GP; a third part that is a symbol used for uplink transmission, wherein the uplink transmission comprises uplink control information transmission; and a fourth part comprising a symbol used for downlink transmission or a symbol used for uplink transmission; and a transceiver module, configured to send and receive information in the serving cell according to the frame structure, determined by the processing module, of the serving cell; characterized in that the fourth part is located in a tail of the first subframe, wherein the first part is a symbol used for downlink control transmission and downlink data transmission; the third part is a symbol used for uplink control information transmission and/or sounding reference signal SRS transmission; and the fourth part is specifically a symbol used for downlink data transmission or a symbol used for uplink data transmission.