Method and device for canceling interference and receiving data in wireless communication system
The present invention relates to a wireless communication system. A method by which a terminal cancels interference and receives data in a wireless communication system, according to one embodiment of the present invention, comprises the steps of receiving first downlink control information (DCI) including scheduling information for receiving a physical downlink shared channel (PDSCH) from a base station, receiving second DCI including scheduling information on an interference channel from a second base station, and canceling the interference from the second base station on the basis of the first DCI and the second DCI, and receiving the PDSCH.
1. A method for canceling interference and receiving data by a user equipment in a wireless communication system, the method comprising:
receiving unified downlink control information (DCI) from a first base station,
wherein the unified DCI comprising a first DCI including a scheduling information for receiving a first downlink shared channel (PDSCH) and a second DCI including a scheduling information for receiving a second PDSCH; and
simultaneously receiving:
the first PDSCH from the first base station in accordance with the scheduling information included in the first DCI of the unified DCI received from the first base station, and
the second PDSCH from a second base station in accordance with the scheduling information included in the second DCI of the unified DCI received from the first base station;
canceling interference of the second PDSCH based on the scheduling information for receiving the second PDSCH included in the unified DCI,
wherein the first PDSCH and the second PDSCH are transmitted by the first and second base stations through respective transmission modes independent from each other,
wherein the unified DCI comprises a field for notifying the user equipment of the transmission modes of the second PDSCH,
wherein the first DCI and the second DCI are quasi co-located through their respective PQIs (PDSCH RE mapping and quasi co-location indicator) independent from each other, and
wherein each of the PQIs includes a virtual cell ID (identifier) for generating a demodulation reference signal (DMRS).
2. The method according to claim 1 , wherein the second DCI is configured to omit an information on a starting symbol of the interfering channel, and the interfering channel is configured to start prior to the PDSCH.
3. The method according to claim 1 , further comprising the step of receiving a validity flag as to whether data received through the interfering channel will be discarded after the interference cancelation, by using the second DCI.
4. The method according to claim 1 , wherein the scheduling information included in the second DCI is transmitted through a field of a fixed size within the second DCI.
5. The method according to claim 1 , wherein the first DCI and the second DCI are configured by their respective quasi co-located behaviors independent from each other.
6. The method according to claim 1 , wherein the first DCI and the second DCI are demodulated based on their respective reference signals (RSs) different from each other.
7. The method according to claim 1 , wherein a rate matching information is omitted for the second DCI, and interference demodulation instead of interference decoding is only performed for the interfering channel.
8. The method according to claim 1 , wherein, if both the first DCI and the second DCI correspond to DMRS based transmission, the sum of the number of layers of the first DCI and the second DCI is restricted so as not to exceed a reference value.
9. The method according to claim 1 , further comprising the step of receiving an information on quasi co-located configuration between a common reference signal (CRS) and a demodulation reference signal (DMRS) for the second base station.
10. A user equipment for canceling interference and receiving data in a wireless communication system, the user equipment comprising:
radio frequency (RF) units; and
a processor, wherein the processor is configured to:
receive unified downlink control information (DCI) from a first base station,
wherein the unified DCI comprising a first DCI including a scheduling information for receiving a first downlink shared channel (PDSCH) and a second DCI including a scheduling information for receiving a second PDSCH; and
simultaneously receive:
the first PDSCH from the first base station in accordance with the scheduling information included in the first DCI of the unified DCI received from the first base station, and
the second PDSCH from a second base station in accordance with the scheduling information included in the second DCI of the unified DCI received from the first base station;
cancel interference of the second PDSCH based on the scheduling information for receiving the second PDSCH included in the unified DCI,
wherein the first PDSCH and the second PDSCH are transmitted by the first and second base stations through respective transmission modes independent from each other,
wherein the unified DCI comprises a field for notifying the user equipment of the transmission modes of the second PDSCH,
wherein the first DCI and the second DCI are quasi co-located through their respective PQIs (PDSCH RE mapping and quasi co-location indicator) independent from each other, and
wherein each of the PQIs includes a virtual cell ID (identifier) for generating a demodulation reference signal (DMRS).