A transmission control method, comprising: sending (S100, S200), by a base station, downlink data to a terminal at a high frequency when detecting that the downlink data needs to be transmitted at the high frequency; receiving, by the base station, from the terminal at the high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information; wherein the receiving, by the base station, from the terminal at the high frequency, control information further comprises: receiving, by the base station, a sending signal from the terminal at the high frequency, wherein the sending signal is based on the downlink data and comprises the control information; processing, by the base station, based on a spread spectrum communications technology, the sending signal to obtain a modulated signal comprising the control information; demodulating, by the base station, the modulated signal by using a lower order modulation mode to obtain a control signal comprising the control information; controlling, by the base station, the transmission process for transmission of high frequency downlink data to the terminal according to the control information; receiving, by the base station, from the terminal at a low frequency, low frequency uplink data used for responding to the high frequency downlink data. sending (S100, S200), by a base station, downlink data to a terminal at a high frequency when detecting that the downlink data needs to be transmitted at the high frequency; receiving, by the base station, from the terminal at the high frequency, control information used for assisting the base station in improving transmission quality of the high frequency downlink data, so that the base station controls a transmission process of the high frequency downlink data according to the control information; wherein the receiving, by the base station, from the terminal at the high frequency, control information further comprises: receiving, by the base station, a sending signal from the terminal at the high frequency, wherein the sending signal is based on the downlink data and comprises the control information; processing, by the base station, based on a spread spectrum communications technology, the sending signal to obtain a modulated signal comprising the control information; demodulating, by the base station, the modulated signal by using a lower order modulation mode to obtain a control signal comprising the control information; controlling, by the base station, the transmission process for transmission of high frequency downlink data to the terminal according to the control information; receiving, by the base station, from the terminal at a low frequency, low frequency uplink data used for responding to the high frequency downlink data. receiving, by the base station, a sending signal from the terminal at the high frequency, wherein the sending signal is based on the downlink data and comprises the control information; processing, by the base station, based on a spread spectrum communications technology, the sending signal to obtain a modulated signal comprising the control information; demodulating, by the base station, the modulated signal by using a lower order modulation mode to obtain a control signal comprising the control information; controlling, by the base station, the transmission process for transmission of high frequency downlink data to the terminal according to the control information; receiving, by the base station, from the terminal at a low frequency, low frequency uplink data used for responding to the high frequency downlink data. <EOS>