Method and apparatus for transreceiving downlink signal by considering antenna port relationship in wireless communication system
The present invention relates to a wireless communication system, and more specifically, disclosed are a method and an apparatus for transmitting or receiving a downlink signal by considering an antenna port relationship. A method for user equipment receiving a physical downlink shared channel (PDSCH) signal in the wireless communication system, according to one embodiment of the present invention, comprises the steps of: determining a start symbol index of the PDSCH from a downlink subframe; and receiving the PDSCH signal based on the start symbol index, wherein the PDSCH can be scheduled by means of downlink control information (DCI) which is received through a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH). When the DCI is comprised according to DCI format 1A, which is transmitted through the EPDDCH, and the downlink subframe is a non-multicast broadcast single frequency network (MBSFN) subframe, the start symbol index can be determined depending on an EPDCCH start symbol value which is established by an upper layer.
1. A method for transmitting a physical downlink shared channel (PDSCH) by a base station (BS) in a wireless communication system, the method comprising:
transmitting, to a user equipment (UE) through a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH), downlink control information (DCI) scheduling the PDSCH, and
transmitting, to the UE, the PDSCH in a downlink subframe based on the DCI,
wherein when the DCI is configured according to DCI format 1A transmitted through the EPDCCH, and the downlink subframe is a non-Multicast Broadcast Single Frequency Network (MBSFN) subframe, a start symbol index of the PDSCH is determined according to an EPDCCH start symbol value set by a higher layer.
2. The method according to claim 1 , wherein the EPDCCH start symbol value is set for an EPDCCH set where the EPDCCH is transmitted.
3. The method according to claim 1 , wherein when the DCI is configured according to the DCI format 1A transmitted through the PDCCH, and the downlink subframe is the non-MBSFN subframe, the start symbol index is determined according to a control format indicator (CFI) value.
4. The method according to claim 3 , wherein the PDSCH is transmitted through antenna port 0 or transmitted in a transmission diversity mode.
5. The method according to claim 1 , wherein the PDSCH is transmitted based on a cell-specific reference signal (CRS).
6. The method according to claim 1 , wherein the UE is set to transmission mode 10 (TM10).
7. The method according to claim 1 , wherein the start symbol index indicates a start Orthogonal Frequency Division Multiplexing (OFDM) symbol from which the PDSCH is mapped in the downlink subframe.
8. A method for receiving a physical downlink shared channel (PDSCH) by a user equipment (UE) in a wireless communication system, the method comprising:
receiving, through a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH), downlink control information (DCI) scheduling the PDSCH, and
receiving the PDSCH in a downlink subframe based on the DCI,
wherein when the DCI is configured according to DCI format 1A received through the EPDCCH, and the downlink subframe is a non-Multicast Broadcast Single Frequency Network (MBSFN) subframe, a start symbol index of the PDSCH is determined according to an EPDCCH start symbol value set by a higher layer.
9. A base station (BS) for transmitting a physical downlink shared channel (PDSCH) in a wireless communication system, the BS comprising:
a transmitter;
a receiver; and
a processor configured to control the transmitter to:
transmit, to a user equipment (UE) through a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH), downlink control information (DCI) scheduling the PDSCH, and
transmit, to the UE, the PDSCH in a downlink subframe based on the DCI,
wherein when the DCI is configured according to DCI format 1A transmitted through the EPDCCH, and the downlink subframe is a non-Multicast Broadcast Single Frequency Network (MBSFN) subframe, a start symbol index of the PDSCH is determined according to an EPDCCH start symbol value set by a higher layer.
10. The BS according to claim 9 , wherein the EPDCCH start symbol value is set for an EPDCCH set where the EPDCCH is transmitted.
11. The BS according to claim 9 , wherein when the DCI is configured according to the DCI format 1A transmitted through the PDCCH, and the downlink subframe is the non-MBSFN subframe, the start symbol index is determined according to a control format indicator (CFI) value.
12. The BS according to claim 11 , wherein the PDSCH is transmitted through antenna port 0 or transmitted in a transmission diversity mode.
13. The BS according to claim 9 , wherein the PDSCH is transmitted based on a cell-specific reference signal (CRS).
14. The BS according to claim 9 , wherein the UE is set to transmission mode 10 (TM10).
15. The BS according to claim 9 , wherein the start symbol index indicates a start Orthogonal Frequency Division Multiplexing (OFDM) symbol from which the PDSCH is mapped in the downlink subframe.
16. A non-transitory computer readable medium recorded thereon a program for executing the method of claim 1 or 8 .
17. A user equipment (UE) for receiving a physical downlink shared channel (PDSCH) in a wireless communication system, the UE comprising:
a transmitter;
a receiver; and
a processor configured to control the receiver to:
receive through a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH), a downlink control information (DCI) scheduling the PDSCH, and
receive the PDSCH in a downlink subframe based on the DCI,
wherein when the DCI is configured according to DCI format 1A received through the EPDCCH, and the downlink subframe is a non-Multicast Broadcast Single Frequency Network (MBSFN) subframe, a start symbol index of the PDSCH is determined according to an EPDCCH start symbol value set by a higher layer.