METHOD AND BASE STATION FOR TRANSMITTING DOWNSTREAM LINK DATA, AND METHOD AND USER DEVICE FOR RECEIVING DOWNSTREAM LINK DATA

摘要

The present invention relates to a method and apparatus which transmit/receive at least one demodulation reference signal by using a CDM group and/or a transmission rank of a user device that have been used to transmit the at least one demodulation reference signal for the user device, an OCC that has been used to extend the demodulation reference signal, etc. Also, the present invention relates to a method and apparatus which change an antenna port for transmitting the demodulation reference signal by using NDI for a deactivated transmission block.