Method for transmitting and receiving downlink signal in wireless communication system and device for same
The present invention relates to a method and a device for receiving a downlink signal by a terminal in a wireless communication system using a time division duplex (TDD) scheme. Specifically, the present invention comprises the steps of: receiving a usage change message indicating a change from a first uplink-downlink configuration to a second uplink-downlink configuration; with regard to a specific subframe, when a wireless frame type according to the first uplink-downlink configuration is different from a wireless frame type according to the second uplink-downlink configuration, determining a subframe type on the basis of a special subframe configuration associated with the first uplink-downlink configuration; and receiving a downlink signal on the basis of the determined subframe type.
1. A method of receiving a downlink signal, which is received by a user equipment in a wireless communication system of a time division duplex (TDD) scheme, the method comprising:
receiving a usage change message for informing of a change from a first uplink-downlink (UL-DL) configuration to a second UL-DL configuration,
wherein the usage change message informs of that a special subframe of the first UL-DL configuration is to be changed to a downlink subframe of the second UL-DL configuration;
determining whether the special subframe is changed to the downlink subframe based on a special subframe configuration and a cyclic prefix of the special subframe related to the first UL-DL configuration; and
receiving the downlink signal based on whether the special subframe is changed to the downlink subframe,
wherein the special subframe configuration is a special subframe configuration #7 and the cyclic prefix is an extended cyclic prefix, and
wherein, based on a downlink control information (DCI) format 1A for receiving the downlink signal, the special subframe is determined not to be changed.
2. The method of claim 1 , wherein the downlink signal is received based on at least one selected from a group consisting of a physical downlink shared channel (PDSCH)/enhanced physical downlink control channel (EPDCCH) resource element mapping rule, a demodulation reference signal (DM-RS) pattern, a cell-specific reference signal (CRS) transmission pattern, and an EPDCCH transmission rule according to whether the special subframe is changed to the downlink subframe.
3. The method of claim 1 , wherein, based on a DCI format 2C or a DCI format 2D for receiving the downlink signal, the special subframe is determined to be changed to the downlink subframe.
4. The method of claim 1 , wherein the special subframe is changed to the downlink subframe based on a DCI format requiring demodulation reference signal (DM-RS) based decoding for receiving the downlink signal.
5. A user equipment for receiving a downlink signal in a wireless communication system of a time division duplex (TDD) scheme, the user equipment comprising:
a transceiver; and
a processor,
wherein the processor is configured to:
control the transceiver to receive a usage change message for informing of a change from a first uplink-downlink (UL-DL) configuration to a second UL-DL configuration,
wherein the usage change message informs of that a special subframe of the first UL-DL configuration is to be changed to a downlink subframe of the second UL-DL configuration,
determine whether the special subframe is changed to the downlink subframe based on a special subframe configuration and a cyclic prefix of the special subframe related to the first UL-DL configuration, and
control the transceiver to receive the downlink signal based on whether the special subframe is changed to the downlink subframe,
wherein the special subframe configuration is a special subframe configuration #7 and the cyclic prefix is an extended cyclic prefix, and
wherein, based on a downlink control information (DCI) format 1A for receiving the downlink signal, the special subframe is determined not to be changed.
6. The user equipment of claim 5 , wherein the downlink signal is received based on at least one selected from a group consisting of a physical downlink shared channel (PDSCH)/enhanced physical downlink control channel (EPDCCH) resource element mapping rule, a demodulation reference signal (DM-RS) pattern, a cell-specific reference signal (CRS) transmission pattern, and an EPDCCH transmission rule according to whether the special subframe is changed to the downlink subframe.
7. The user equipment of claim 5 , wherein, based on a DCI format 2C or a DCI format 2D for receiving the downlink signal, the special subframe is determined to be changed to the downlink subframe.
8. The user equipment of claim 5 , wherein the special subframe is changed to the downlink subframe based on a DCI format requiring demodulation reference signal (DM-RS) based decoding for receiving the downlink signal.