Patent ID: 8837371
Filing Date: 2014-09-16
Classification: H04L

Abstract:
1. A method of mapping to a demodulation reference signal port, comprising: assigning, by a base station, a User Equipment, UE, with a corresponding data stream dependent upon an attribute of the UE; mapping, by the base station, the corresponding data stream from a layer to a corresponding demodulation reference signal port dependent upon a value of a rank; and transmitting, by the base station, the corresponding data stream to the UE via the demodulation reference signal port; wherein for downlink transmission at the rank=2, mapping, by the base station, the corresponding data stream from the layer to the corresponding demodulation reference signal port comprises: when downlink transmission is double-codeword transmission at the rank=2, the base station maps two layers to two demodulation reference signal ports belonging to a same code division multiplexing (CDM) group.