Reference signal transmission method for downlink multiple input multiple output system

摘要

A reference signal transmission method in a downlink MIMO system is disclosed. The downlink MIMO system supports a first UE supporting N transmission antennas among a total of M transmission antennas (where M>N) and a second UE supporting the M transmission antennas. The method includes transmitting, by a base station (BS), subframe-associated information which designates a first subframe in which data for the first UE and the second UE is transmitted and a second subframe in which data only for the second UE can be transmitted within a radio frame having a plurality of subframes, and transmitting the first subframe and the second subframe. Reference signals corresponding to antenna ports ‘0’ to ‘N−1’ of the N antennas are mapped to the first subframe, and reference signals corresponding to antenna ports ‘0’ to ‘M−1’ of the M antennas are mapped to the second subframe.

主权项

1. A method for transmitting at least one first type reference signal and at least one second type reference signal for channel measurement in an OFDM (Orthogonal Frequency Division Multiplex) system, the method comprising:
transmitting, by a base station to a user equipment, information indicating an occurrence of a first subframe including the at least one second type reference signal; and transmitting, by the base station to the user equipment, the first subframe including M number of reference signals, the M number of reference signals including N (N