A transmission control method, performed by a network management server and comprising: receiving (S101) a registration request which is sent by a base station having downloaded a target file and used for requesting to register as file providing equipment, wherein the registration request comprises information of the target file; and configuring (S102) the base station as the file providing equipment, wherein the file providing equipment is used to provide a download service of the target file to a base station which has not downloaded the target file, wherein before the receiving (S101) the registration request which is sent by the base station having downloaded the target file and used for requesting to register as the file providing equipment, the method further comprises: selecting (S201), from file providing equipment, target file providing equipment for a base station which has not downloaded the target file, wherein the file providing equipment comprises one or more file servers, or the file providing equipment comprises one or more file servers and one or more base stations having downloaded the target file; and sending (S202) a download instruction to the base station which has not downloaded the target file, wherein the download instruction comprises information of the target file and information of target file providing equipment, and the download instruction is used to instruct the base station which has not downloaded the target file to download the target file from the target file providing equipment. receiving (S101) a registration request which is sent by a base station having downloaded a target file and used for requesting to register as file providing equipment, wherein the registration request comprises information of the target file; and configuring (S102) the base station as the file providing equipment, wherein the file providing equipment is used to provide a download service of the target file to a base station which has not downloaded the target file, wherein before the receiving (S101) the registration request which is sent by the base station having downloaded the target file and used for requesting to register as the file providing equipment, the method further comprises: selecting (S201), from file providing equipment, target file providing equipment for a base station which has not downloaded the target file, wherein the file providing equipment comprises one or more file servers, or the file providing equipment comprises one or more file servers and one or more base stations having downloaded the target file; and sending (S202) a download instruction to the base station which has not downloaded the target file, wherein the download instruction comprises information of the target file and information of target file providing equipment, and the download instruction is used to instruct the base station which has not downloaded the target file to download the target file from the target file providing equipment. selecting (S201), from file providing equipment, target file providing equipment for a base station which has not downloaded the target file, wherein the file providing equipment comprises one or more file servers, or the file providing equipment comprises one or more file servers and one or more base stations having downloaded the target file; and sending (S202) a download instruction to the base station which has not downloaded the target file, wherein the download instruction comprises information of the target file and information of target file providing equipment, and the download instruction is used to instruct the base station which has not downloaded the target file to download the target file from the target file providing equipment. <EOS>