An information transmission method, wherein the method is applied to a time division duplexing, TDD, system, and the method comprises: sending , by a first communications device, indication information to a second communications device based on attribute information of to-be-transmitted target information between the first communications device and the second communications device, wherein the indication information is used to indicate a concurrent subframe in which the first communications device and the second communications device perform information transmission; and sending , by the first communications device, first information to the second communications device on a first time-frequency resource in the concurrent subframe, and receiving, on a second time-frequency resource in the concurrent subframe, second information sent by the second communications device, wherein the to-be-transmitted target information is the first information or the second information; wherein when the to-be-transmitted target information is data information, the indication information comprises identification information of an RB in the first time-frequency resource and identification information of an RB in the second time-frequency resource; and wherein the concurrent subframe further comprises a blank RB, and the blank RB is a guard resource between the RB in the first time-frequency resource and the RB in the second time-frequency resource, wherein the quantity and allocation of blank RBs in the concurrent subframe is flexibly determined based on the capability of the first communications device and the capability of the second communications device. sending , by a first communications device, indication information to a second communications device based on attribute information of to-be-transmitted target information between the first communications device and the second communications device, wherein the indication information is used to indicate a concurrent subframe in which the first communications device and the second communications device perform information transmission; and sending , by the first communications device, first information to the second communications device on a first time-frequency resource in the concurrent subframe, and receiving, on a second time-frequency resource in the concurrent subframe, second information sent by the second communications device, wherein the to-be-transmitted target information is the first information or the second information; wherein when the to-be-transmitted target information is data information, the indication information comprises identification information of an RB in the first time-frequency resource and identification information of an RB in the second time-frequency resource; and wherein the concurrent subframe further comprises a blank RB, and the blank RB is a guard resource between the RB in the first time-frequency resource and the RB in the second time-frequency resource, wherein the quantity and allocation of blank RBs in the concurrent subframe is flexibly determined based on the capability of the first communications device and the capability of the second communications device. <EOS>