A base station, comprising: a controlling module, configured to reserve, in a second subframe, acknowledgement channel resources for each subframe in a first subframe set, wherein acknowledgement channel resources reserved for at least two subframes in the first subframe set completely or partly overlap; and a communicating module, configured to transmit, in the first subframe set, data with a first user equipment; wherein: the controlling module is specifically configured to reserve, in the second subframe, acknowledgement channel resources for each subframe in the first subframe set, wherein the first subframe set comprises a subset part and a complement part, acknowledgement channel resources reserved for the complement part completely or partly overlap with acknowledgement channel resources reserved for the subset part, and characterised by when the subset part comprises more than one subframe, acknowledgement channel resources reserved by the base station for each subframe in the subset part do not mutually overlap; further comprising: a first obtaining module, configured to obtain a first subframe ratio and a second subframe ratio; and a second obtaining module, configured to obtain the first subframe set and the second subframe according to the first subframe ratio, and obtain the subset part and the complement part according to the first subframe ratio and the second subframe ratio. a controlling module, configured to reserve, in a second subframe, acknowledgement channel resources for each subframe in a first subframe set, wherein acknowledgement channel resources reserved for at least two subframes in the first subframe set completely or partly overlap; and a communicating module, configured to transmit, in the first subframe set, data with a first user equipment; wherein: the controlling module is specifically configured to reserve, in the second subframe, acknowledgement channel resources for each subframe in the first subframe set, wherein the first subframe set comprises a subset part and a complement part, acknowledgement channel resources reserved for the complement part completely or partly overlap with acknowledgement channel resources reserved for the subset part, and characterised by when the subset part comprises more than one subframe, acknowledgement channel resources reserved by the base station for each subframe in the subset part do not mutually overlap; further comprising: a first obtaining module, configured to obtain a first subframe ratio and a second subframe ratio; and a second obtaining module, configured to obtain the first subframe set and the second subframe according to the first subframe ratio, and obtain the subset part and the complement part according to the first subframe ratio and the second subframe ratio. the controlling module is specifically configured to reserve, in the second subframe, acknowledgement channel resources for each subframe in the first subframe set, wherein the first subframe set comprises a subset part and a complement part, acknowledgement channel resources reserved for the complement part completely or partly overlap with acknowledgement channel resources reserved for the subset part, and characterised by when the subset part comprises more than one subframe, acknowledgement channel resources reserved by the base station for each subframe in the subset part do not mutually overlap; further comprising: a first obtaining module, configured to obtain a first subframe ratio and a second subframe ratio; and a second obtaining module, configured to obtain the first subframe set and the second subframe according to the first subframe ratio, and obtain the subset part and the complement part according to the first subframe ratio and the second subframe ratio. a first obtaining module, configured to obtain a first subframe ratio and a second subframe ratio; and a second obtaining module, configured to obtain the first subframe set and the second subframe according to the first subframe ratio, and obtain the subset part and the complement part according to the first subframe ratio and the second subframe ratio.