CQI DEFINITION FOR TRANSMISSION MODE 9 IN LTE-ADVANCED

摘要

An evolved Node B (eNB) in a 3GPP LTE-based network receives Channel State Information-Reference Signal (CSI-RS) from a User Equipment (UE) that is configured with Precoder Matrix Indictor (PMI) disabled. A channel is estimated between the eNB and the UE for link adaptation in Transmission Mode 9 (TM9) based on CSI RS by the UE and SRS by the eNB. CQI is calculated at UE such that if a number of CSI RS antenna ports equals one, TM9 transmission from the eNB to the UE uses a predetermined single antenna port. If the number of CSI RS antenna ports equals two, TM9 transmission from the eNB to the UE uses transmit diversity. If the number of CSI RS antenna ports does not equal one or two, TM9 transmission from the eNB to the UE uses spatial multiplexing based on a rank -1 precoder that is determined from a wideband channel covariance matrix R.