Method and apparatus for transmitting/receiving downlink signal considering antenna port relationship in wireless communication system

A method for transmitting a physical downlink shared channel (PDSCH) signal by a base station (BS) having one or more cells in a wireless communication system, the method comprising:

• transmitting, to a user equipment (UE) through a higher layer, a PDSCH resource element mapping and Quasi co-location Indicator (PQI) parameter set;
• and
• transmitting, to the UE via a predetermined cell, the PDSCH signal in a downlink subframe based on a start symbol index of the PDSCH in the downlink subframe,
• wherein when a first PDSCH start symbol value is included in the PQI parameter set and the downlink subframe is a Multicast Broadcast Single Frequency Network (MBSFN) subframe, the start symbol index corresponds to a smaller one among the first PDSCH start symbol value contained in the PQI parameter set and a predefined threshold, and
• wherein when the first PDSCH start symbol value is not included in the PQI parameter set, and a second PDSCH start symbol value for the predetermined cell is configured by the higher layer for carrier aggregation, the start symbol index corresponds to the second PDSCH start symbol value for the predetermined cell.

A base station (BS) having one or more cells, the BS comprising:

• a transmitter;
• a processor controls the transmitter to transmit, to a user equipment (UE) through a higher layer, a physical downlink shared channel (PDSCH) resource element mapping and Quasi co-location Indicator (PQI) parameter set and to transmit, to the UE via a predetermined cell, the PDSCH signal in a downlink subframe based on a start symbol index of the PDSCH in the downlink subframe,
• wherein when a first PDSCH start symbol value is included in the PQI parameter set and the downlink subframe is a Multicast Broadcast Single Frequency Network (MBSFN) subframe, the start symbol index corresponds to a smaller one among the first PDSCH start symbol value contained in the PQI parameter set and a predefined threshold, and
• wherein when the first PDSCH start symbol value is not included in the PQI parameter set, and a second PDSCH start symbol value for the predetermined cell is configured by the higher layer for carrier aggregation, the start symbol index corresponds to the second PDSCH start symbol value for the predetermined cell.