A method for obtaining channel state information, comprising: obtaining reference signal, RS, sequence information and sending it to a user equipment, UE, by each cell of at least two cells, wherein the RS sequence information is used to generate the RS, and wherein according to the RS sequence information, times and frequencies used to transmit the RS to the UE are the same as RS predetermined transmission times and RS predetermined frequencies, respectively; and transmitting, by each cell of at least two cells, the RS predetermined transmission times and the RS predetermined frequencies to the UE through corresponding antenna ports, wherein the RS predetermined transmission times and the RS predetermined frequencies transmitted by one cell in the at least two cells are different from those transmitted by another cell in the at least two cells, characterized in that the method further comprises: each cell of the at least two cells, by using the RS predetermined transmission times and the RS predetermined frequencies, transmitting a RS to the UE, wherein the cell redistributes transmission power related to a resource element, RE, so as to keep constant transmission power with time for the cell; and receiving, by each cell of the at least two cells, a RS measurement result from the UE, wherein the measurement result comprises channel state information, CSI, between each cell of at least two cells and the UE, each CSI is measured in a period of several TTIs, and TTI represents Transmission Time Interval which is taken by RS resources as a unit in time. obtaining reference signal, RS, sequence information and sending it to a user equipment, UE, by each cell of at least two cells, wherein the RS sequence information is used to generate the RS, and wherein according to the RS sequence information, times and frequencies used to transmit the RS to the UE are the same as RS predetermined transmission times and RS predetermined frequencies, respectively; and transmitting, by each cell of at least two cells, the RS predetermined transmission times and the RS predetermined frequencies to the UE through corresponding antenna ports, wherein the RS predetermined transmission times and the RS predetermined frequencies transmitted by one cell in the at least two cells are different from those transmitted by another cell in the at least two cells, characterized in that the method further comprises: each cell of the at least two cells, by using the RS predetermined transmission times and the RS predetermined frequencies, transmitting a RS to the UE, wherein the cell redistributes transmission power related to a resource element, RE, so as to keep constant transmission power with time for the cell; and receiving, by each cell of the at least two cells, a RS measurement result from the UE, wherein the measurement result comprises channel state information, CSI, between each cell of at least two cells and the UE, each CSI is measured in a period of several TTIs, and TTI represents Transmission Time Interval which is taken by RS resources as a unit in time. each cell of the at least two cells, by using the RS predetermined transmission times and the RS predetermined frequencies, transmitting a RS to the UE, wherein the cell redistributes transmission power related to a resource element, RE, so as to keep constant transmission power with time for the cell; and receiving, by each cell of the at least two cells, a RS measurement result from the UE, wherein the measurement result comprises channel state information, CSI, between each cell of at least two cells and the UE, each CSI is measured in a period of several TTIs, and TTI represents Transmission Time Interval which is taken by RS resources as a unit in time.