Method and device for transmitting downlink signal in wireless communication system
The present invention relates to a wireless communication system and, more particularly, to a method and a device for receiving a DL signal, by a terminal, in an FDD cell comprising a DL CC and a UL CC, the method comprising the steps of: receiving SF reconfiguration information about a UL CC; and receiving DL data on an FDD cell, wherein, if the DL data is received in a DL SF on the DL CC, the DL data is processed by means of an OFDM mode and, if the DL data is received in a DL SF reconfigured from a UL SF on the basis of the SF reconfiguration information on the UL CC, the DL data is processed by means of an SC-FDM mode.
1. A method for a user equipment (UE) to receive a Downlink (DL) signal through a Frequency Division Duplex (FDD) cell including an Uplink (UL) Component Carrier (CC) and a DL CC in a wireless communication system, the method comprising:
receiving, from a base station (BS), Subframe (SF) reconfiguration information about the UL CC,
wherein the SF reconfiguration information includes information on a reconfigured DL SF set on the UL CC, and
wherein the reconfigured DL SF set includes SFs reconfigured from UL SFs to DL SFs on the UL CC, based on the SF reconfiguration information; and
receiving, from the BS, a Physical Downlink Shared Channel (PDSCH) signal on the DL CC or the UL CC included in the FDD cell,
wherein when the PDSCH signal is received from the BS via DL SF on the DL CC, the PDSCH signal received from the BS is processed based on an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and
wherein when the PDSCH signal is received from the BS via a reconfigured DL SF included in the reconfigured DL SF set on the UL CC, the PDSCH signal received from the BS is processed based on a Single Carrier-Frequency Division Multiplexing (SC-FDM) scheme of a UL transmission format.
2. The method of claim 1 , wherein when the PDSCH signal is received via the DL SF on the DL CC, a Demodulation Reference Signal (DMRS) for the PDSCH signal is mapped by being distributed within the DL SF, and
wherein when the PDSCH signal is received via the reconfigured DL SF on the UL CC, the DMRS for the PDSCH signal is mapped contiguously to a specific transmission symbol in the reconfigured DL SF.
3. The method of claim 2 , further comprising:
receiving a Physical Downlink Control Channel (PDCCH) including scheduling information for the PDSCH signal,
wherein when the PDCCH is received via the DL SF on the DL CC, the PDCCH is mapped to at least one first transmission symbol in the DL SF, and
wherein when the PDCCH is received via the reconfigured DL SF on the UL CC, the PDCCH is mapped to an adjacent transmission symbol of the specific transmission symbol having the DMRS contiguously mapped thereto in the reconfigured DL SF.
4. The method of claim 1 , further comprising:
receiving a Channel State Information-Reference Signal (CSI-RS) on the DL CC or the UL CC included in the FDD cell,
wherein when the CSI-RS is received via the DL SF on the DL CC, the CSI-RS is mapped by being distributed within the DL SF, and
wherein when the CSI-RS is received via the reconfigured DL SF on the UL CC, the CSI-RS is mapped to a last transmission symbol in the reconfigured DL SF.
5. A user equipment (UE) configured to receive a Downlink (DL) signal through a Frequency Division Duplex (FDD) cell including an Uplink (UL) Component Carrier (CC) and a DL CC, the UE comprising:
a transceiver; and
at least one processor,
wherein the at least one processor is configured to:
control the transceiver to receive, from a base station (BS), Subframe (SF) reconfiguration information about the UL CC, and
control the transceiver to receive, from the BS, a Physical Downlink Shared Channel (PDSCH) signal on the DL CC or the UL CC included in the FDD cell,
wherein the SF reconfiguration information includes information on a reconfigured DL SF set on the UL CC,
wherein the reconfigured DL SF set includes SFs reconfigured from UL SFs to DL SFs on the UL CC, based on the SF reconfiguration information,
wherein when the PDSCH signal is received from the BS via DL SF on the DL CC, the PDSCH signal received from the BS is processed based on an Orthogonal Frequency Division Multiplexing (OFDM) scheme, and
wherein when the PDSCH signal is received from the BS via a reconfigured DL SF included in the reconfigured DL SF set on the UL CC, the PDSCH signal received from the BS is processed based on a Single Carrier-Frequency Division Multiplexing (SC-FDM) scheme of a UL transmission format.
6. The UE of claim 5 , wherein when the PDSCH signal is received via the DL SF on the DL CC, a Demodulation Reference Signal (DMRS) for the PDSCH signal is mapped by being distributed within the DL SF, and
wherein when the PDSCH signal is received via the in the reconfigured DL SF on the UL CC, the DMRS for the PDSCH signal is mapped contiguously to a specific transmission symbol in the reconfigured DL SF.
7. The UE of claim 6 , wherein the at least one processor is further configured to control the transceiver to receive a Physical Downlink Control Channel (PDCCH) including scheduling information for the PDSCH signal,
wherein when the PDCCH is received via the DL SF on the DL CC, the PDCCH is mapped to at least one first transmission symbol in the DL SF, and
wherein when the PDCCH is received via the reconfigured DL SF on the UL CC, the PDCCH is mapped to an adjacent transmission symbol of the specific transmission symbol having the DMRS contiguously mapped thereto in the reconfigured DL SF.
8. The UE of claim 5 , wherein the at least one processor is further configured to control the transceiver to receive a Channel State Information-Reference Signal (CSI-RS) on the DL CC or the UL CC included in the FDD cell,
wherein when the CSI-RS is received via the DL SF on the DL CC, the CSI-RS is mapped by being distributed within the DL SF, and
wherein when the CSI-RS is received via the reconfigured DL SF on the UL CC, the CSI-RS is mapped to a last transmission symbol in the reconfigured DL SF.