Method, mobile station and base station for transmitting data in a mobile communication system

摘要

The present invention provides a method, base station and user equipment for transmitting data in a mobile communications system, wherein said data is transmitted on at least one channel between at least one base station with multiple antennas and at least one user equipment. The base station applies precoding to the data based on a set of predefined codebooks. A first tracking mode with a first codebook from said set of predefined codebooks is used for said precoding, and at least a second tracking mode with at least a second codebook from said set of predefined codebooks is used for said precoding. The base station switches between said first tracking mode and said second tracking mode depending on at least one condition of said channel.