Patent ID: 8503375

Claim:
A method of sending data in a wireless communication system utilizing time division duplexing (TDD), comprising: receiving a sounding reference signal on an uplink; determining a precoding matrix for data transmission on a downlink, based on the sounding reference signal; determining at least one modulation and coding scheme for the data transmission on the downlink, based on the sounding reference signal; sending the data transmission on the downlink based on the precoding matrix and the at least one modulation and coding scheme; receiving channel quality indicator (CQI) information indicative of channel quality of the downlink; estimating noise and interference for the uplink based on the sounding reference signal; determining asymmetry of noise and interference for the downlink and the uplink based on the CQI information and the estimated noise and interference for the uplink; and estimating noise and interference for the downlink based on the estimated noise and interference for the uplink and the asymmetry, wherein the at least one modulation and coding scheme is determined based on the estimated noise and interference for the downlink.