User equipment, comprising: a determining unit, configured to determine a frame structure of a serving cell, wherein each frame based on the frame structure comprises 2k subframes, the 2k subframes comprise at least (N-1) downlink subframes, at least (N-1) uplink subframes, and at least one special subframe, the special subframe is a first special subframe or a second special subframe, N is a positive integer greater than or equal to 1, and k is a positive integer greater than 1; and a processing unit, configured to send and receive, based on the frame structure, information in the serving cell; wherein each frame comprises N downlink subframes, N uplink subframes, and (2k-2N) special subframes, and N is less than k; or each frame comprises N downlink subframes, (N-1) uplink subframes, and one second special subframe, and N is equal to k; or each frame comprises (N-1) downlink subframes, N uplink subframes, and one first special subframe, and N is equal to k; wherein the special subframe comprises a time domain symbol used for downlink transmission, a guard period, GP, and a time domain symbol used for uplink transmission; in the first special subframe, a quantity of time domain symbols used for downlink transmission is greater than a quantity of time domain symbols used for uplink transmission; and in the second special subframe, a quantity of time domain symbols used for downlink transmission is less than a quantity of time domain symbols used for uplink transmission; characterised in that in the frame structure, if a subframe l is a downlink subframe, a subframe ( l +k) is an uplink subframe or a second special subframe, and l is an integer; or if a subframe l is an uplink subframe, a subframe ( l +k) is a downlink subframe or a first special subframe, and l is an integer. a determining unit, configured to determine a frame structure of a serving cell, wherein each frame based on the frame structure comprises 2k subframes, the 2k subframes comprise at least (N-1) downlink subframes, at least (N-1) uplink subframes, and at least one special subframe, the special subframe is a first special subframe or a second special subframe, N is a positive integer greater than or equal to 1, and k is a positive integer greater than 1; and a processing unit, configured to send and receive, based on the frame structure, information in the serving cell; wherein each frame comprises N downlink subframes, N uplink subframes, and (2k-2N) special subframes, and N is less than k; or each frame comprises N downlink subframes, (N-1) uplink subframes, and one second special subframe, and N is equal to k; or each frame comprises (N-1) downlink subframes, N uplink subframes, and one first special subframe, and N is equal to k; wherein the special subframe comprises a time domain symbol used for downlink transmission, a guard period, GP, and a time domain symbol used for uplink transmission; in the first special subframe, a quantity of time domain symbols used for downlink transmission is greater than a quantity of time domain symbols used for uplink transmission; and in the second special subframe, a quantity of time domain symbols used for downlink transmission is less than a quantity of time domain symbols used for uplink transmission; characterised in that in the frame structure, if a subframe l is a downlink subframe, a subframe ( l +k) is an uplink subframe or a second special subframe, and l is an integer; or if a subframe l is an uplink subframe, a subframe ( l +k) is a downlink subframe or a first special subframe, and l is an integer.