Patent ID: 8711964

Claim:
A method for pre-scheduling in a Closed-Loop (CL) Multiple User Multiple Input Multiple Output (MU-MIMO) antenna system, the method comprising: receiving channel information representing a downlink channel condition of each mobile station in a plurality of mobile stations in a cell; determining a plurality of candidate user groups associated with a plurality of frequency bands included in an entire frequency band, based on the channel information, each candidate user group comprising mobile stations to which resources can be simultaneously allocated in the corresponding frequency band; instructing the mobile stations in each candidate user group to transmit sounding signals through the frequency band associated with the each candidate user group; and performing a scheduling with regard to the mobile stations in the each candidate user group in response to receiving the sounding signals through the frequency band associated with the each candidate user group, wherein each of the plurality of candidate user groups is respectively associated with one of the plurality of frequency bands.