Downlink channel information feedback method and system in multipoint collaborative transmission

The present invention provides a multi-point collaborative transmission downlink channel information feedback method, comprising: a multi-coordinated transmission, the user gets SINR, the SINR quantized channel quality indication, the channel quality indication feedback to the service area, users of the service cell and the cell together form a coordinated set of cooperative transmission, if the cooperative transmission set transparent to the user that the user knows the cooperative transmission set information, the SINR is: or if the cooperative transmission set transparent to the user that the user is unknown the cooperative transmission set information, the signal to interference noise ratio is: where, pS serving cell transmitter signal received power, pA synergistic cell transmitter signal reception power; pI is interference and noise power of the received signal. The present invention also provides a coordinated multi-point transmission in the downlink channel information feedback system. The present invention can not introduce additional interference feedback overhead multi-point transmission of information under the cooperative interference feedback.