An information sending method performed by a system comprising a base station and a user equipment, UE, wherein the base station comprises multiple radio remote units, RRUs, in a radio remote scenario in which the multiple RRUs belong to a same physical cell, share a same cell identity, simultaneously serve a same user equipment, UE, and transmit a same downlink signal to the UE, wherein the method comprises: • setting up, by the base station, a connection to the UE; • sending, by the base station to the UE, notification information indicating that the UE is in the radio remote scenario, wherein the notification information is used to instruct the UE to perform channel estimation by using a channel estimation algorithm applicable to the radio remote scenario; wherein the sending, to the UE, notification information indicating that the UE is in the radio remote scenario comprises: ∘ sending radio resource control, RRC, dedicated signaling to the UE, wherein a first indicator bit in the RRC dedicated signaling is used to indicate that the UE is in the radio remote scenario; or ∘ sending a system message to the UE, wherein a second indicator bit in the system message is used to indicate that the UE is in the radio remote scenario; • sending, by the multiple RRUs, the same downlink signal to the UE; • receiving, by the UE, the same downlink signals from the multiple RRUs, and • performing, by the UE according to the sent notification information, the channel estimation by using the channel estimation algorithm applicable to the radio remote scenario, wherein the channel estimation algorithm is used to perform the channel estimation on a superposed signal that is obtained after the same downlink signals from the multiple RRUs are superposed, characterised in that the performing the channel estimation on the superposed signal that is obtained after the same downlink signals from the multiple RRUs are superposed comprises: ∘ determining, by the UE based on the superposed signal, a delay and a Doppler shift of each downlink signal among the same downlink signals from the RRUs; ∘ performing, by the UE on the superposed signal, a compensation of the determined delays and of the determined Doppler shifts of each RRU among the multiple RRUs; and ∘ determining, by the UE, a Wiener coefficient for the superposed signal after the delay and Doppler compensation, and finally performing, by the UE, the channel estimation by using the determined Wiener coefficient. • setting up, by the base station, a connection to the UE; • sending, by the base station to the UE, notification information indicating that the UE is in the radio remote scenario, wherein the notification information is used to instruct the UE to perform channel estimation by using a channel estimation algorithm applicable to the radio remote scenario; wherein the sending, to the UE, notification information indicating that the UE is in the radio remote scenario comprises: ∘ sending radio resource control, RRC, dedicated signaling to the UE, wherein a first indicator bit in the RRC dedicated signaling is used to indicate that the UE is in the radio remote scenario; or ∘ sending a system message to the UE, wherein a second indicator bit in the system message is used to indicate that the UE is in the radio remote scenario; ∘ sending radio resource control, RRC, dedicated signaling to the UE, wherein a first indicator bit in the RRC dedicated signaling is used to indicate that the UE is in the radio remote scenario; or ∘ sending a system message to the UE, wherein a second indicator bit in the system message is used to indicate that the UE is in the radio remote scenario; • sending, by the multiple RRUs, the same downlink signal to the UE; • receiving, by the UE, the same downlink signals from the multiple RRUs, and • performing, by the UE according to the sent notification information, the channel estimation by using the channel estimation algorithm applicable to the radio remote scenario, wherein the channel estimation algorithm is used to perform the channel estimation on a superposed signal that is obtained after the same downlink signals from the multiple RRUs are superposed, characterised in that the performing the channel estimation on the superposed signal that is obtained after the same downlink signals from the multiple RRUs are superposed comprises: ∘ determining, by the UE based on the superposed signal, a delay and a Doppler shift of each downlink signal among the same downlink signals from the RRUs; ∘ performing, by the UE on the superposed signal, a compensation of the determined delays and of the determined Doppler shifts of each RRU among the multiple RRUs; and ∘ determining, by the UE, a Wiener coefficient for the superposed signal after the delay and Doppler compensation, and finally performing, by the UE, the channel estimation by using the determined Wiener coefficient. ∘ determining, by the UE based on the superposed signal, a delay and a Doppler shift of each downlink signal among the same downlink signals from the RRUs; ∘ performing, by the UE on the superposed signal, a compensation of the determined delays and of the determined Doppler shifts of each RRU among the multiple RRUs; and ∘ determining, by the UE, a Wiener coefficient for the superposed signal after the delay and Doppler compensation, and finally performing, by the UE, the channel estimation by using the determined Wiener coefficient.