In a 3rd Generation Partnership Project Long Term Evolution (LTE for short) system, user equipment feeds back obtained channel state information (CSI for short) of a downlink channel to a base station, and the base station selects an appropriate communications data modulation and coding scheme, a data transmission speed, and a transmission subband for the user equipment according to the channel state information that is fed back. A multi-user multiple-input multiple-output (MU-MIMO for short) communications manner is introduced to LTE R10, that is, a multi-antenna mechanism is introduced to an user equipment end, and multiple user equipments communicate simultaneously. In this mechanism, a quantity of antennas at an evolved NodeB (eNodeB for short) end is relatively large. By introducing multiple antennas to the user equipment end, single user equipment may establish multiple data streams with an eNodeB, thereby bringing a higher spatial multiplexing gain.
In the prior art, user equipment feeds back channel state report (CSR for short) information to a base station based on a code word granularity, that is, feeds back, to the base station, overall channel quality information of a spatial flow included in each code word for information transmission between the user equipment and the base station, and the base station schedules a downlink resource according to a status of overall channel quality of the spatial flow in each code word; however, the method may cause improper spatial flow scheduling that is performed by the base station, thereby resulting in a waste of system resources.