Method and apparatus for transmitting/receiving downlink signal considering antenna port relationship in wireless communication system
The present invention relates to a wireless communication system, and more specifically, to a method and an apparatus for transmitting or receiving a downlink signal considering an antenna port relationship. The method for enabling a terminal to receive a physical downlink sharing channel (PDSCH) signal in the wireless communication system according to one embodiment of the present invention can determine a PDSCH start symbol index according to the predetermined priority and receive the PDSCH signal therethrough. The PDSCH start symbol index can be determined when a PDSCH start symbol value included in a PDSCH resource element mapping and Quasi co-location Indicator (PQI) parameter set is determined by an upper layer. The PDSCH start symbol index can be determined according to the PDSCH start symbol value for a cell receiving the PDSCH when the PDSCH start symbol value included in the PQI parameter set is not determined by the upper layer.
1. A method for receiving a physical downlink shared channel (PDSCH) signal by a user equipment (UE) in a wireless communication system, the method comprising:
determining a start symbol index of the PDSCH in a downlink subframe; and
receiving the PDSCH signal based on the start symbol index,
wherein, when a PDSCH start symbol value contained in a PDSCH resource element mapping and Quasi co-location Indicator (PQI) parameter set is configured for the UE by a higher layer, the start symbol index is determined according to the PDSCH start symbol value contained in the PQI parameter set,
wherein, when the PDSCH start symbol value contained in the PQI parameter set is not configured for the UE by the higher layer, and a PDSCH start symbol value for a cell via which the PDSCH is received is configured by the higher layer, the start symbol index is determined according to the PDSCH start symbol value for the cell via which the PDSCH is received.
2. The method according to claim 1 , wherein the PDSCH is allocated according to downlink control information (DCI) of a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH).
3. The method according to claim 2 , wherein, when the DCI is configured according to DCI format 2D, the PQI parameter set is determined according to a state value of a PQI field of the DCI format 2D.
4. The method according to claim 2 , wherein, when the DCI is configured according to DCI format 1A, the PQI parameter set is a PQI parameter set having a lowest index.
5. The method according to claim 2 , wherein, when a cell via which the PDCCH or the EPDCCH is received is different from the cell via which the PDSCH is received, the start symbol index is determined according to the PDSCH start symbol value for the cell via which the PDSCH is received.
6. The method according to claim 1 , wherein the PQI parameter set comprises at least one of parameters corresponding to number-of-CRS (Cell-specific Reference Signal) ports information, CRS frequency shift information, Multicast Broadcast Single Frequency Network (MBSFN) subframe configuration information, Zero Power Channel State Information Reference Signal (ZP CSI-RS) configuration information, the PDSCH start symbol value, and Non-Zero Power (NZP) CSI-RS configuration information.
7. The method according to claim 1 , wherein the PDSCH start symbol value contained in the PQI parameter set is one of 1, 2, 3 and 4.
8. The method according to claim 1 , wherein, when the PDSCH start symbol value contained in the PQI parameter set is not configured for the UE by the higher layer, and the PDSCH start symbol value for the cell via which the PDSCH is received is not configured by the higher layer, the start symbol index is determined based on a control format indicator (CFI) value.
9. The method according to claim 1 , wherein the UE is set to transmission mode 10 (TM10).
10. The method according to claim 1 , wherein the PDSCH start symbol index indicates a start Orthogonal Frequency Division Multiplexing (OFDM) symbol from which the PDSCH mapped in the downlink subframe.
11. A user equipment (UE) for receiving a physical downlink shared channel (PDSCH) signal in a wireless communication system, the UE comprising:
a transmit module;
a receive module; and
a processor,
wherein the processor is configured to determine a start symbol index of the PDSCH in a downlink subframe and to receive the PDSCH signal based on the start symbol index,
wherein, when a PDSCH start symbol value contained in a PDSCH resource element mapping and Quasi co-location Indicator (PQI) parameter set is configured for the UE by a higher layer, the start symbol index is determined according to the PDSCH start symbol value contained in the PQI parameter set,
wherein, when the PDSCH start symbol value contained in the PQI parameter set is not configured for the UE by the higher layer, and a PDSCH start symbol value for a cell via which the PDSCH is received is configured by the higher layer, the start symbol index is determined according to the PDSCH start symbol value for the cell via which the PDSCH is received.