Method for transmitting and receiving downlink data in wireless communication system, and apparatus therefor
Disclosed are a method for transmitting and receiving downlink data in a wireless communication system, and an apparatus therefor. Specifically, a method for receiving downlink data from multiple cells in a wireless communication system may comprise a step for receiving downlink data on a physical downlink shared channel (PDSCH), wherein the PDSCH includes a first resource block group and a second resource block group, downlink data transmitted from a first cell is mapped to the first resource block group, downlink data transmitted from a second cell is mapped to the second resource block group, and a quasi-co-location (QCL) assumption is independently applied in order to decode the first resource block group and the second resource block group.
1. A method for receiving downlink data in a wireless communication system, the method performed by user equipment (UE) comprising:
receiving configuration information including a plurality of QCL (quasi-co-location) related information;
receiving downlink control information (DCI) including information indicating at least two of the plurality of QCL related information,
wherein first QCL related information and second QCL related information are indicated based on the DCI; and
receiving downlink data on a plurality of resources,
wherein the plurality of resources comprise first resources and second resources that are non-overlapping in the frequency domain, and
wherein the first QCL related information is associated with the first resources and the second QCL related information is associated with the second resources.
2. The method of claim 1 , wherein the a first resource block group comprises the first resources and a second resource block group comprises the second resources.
3. The method of claim 2 , wherein it is assumed that an antenna port associated with the first resource block group and an antenna port corresponding to a first channel state information-reference signal (CSI-RS) resource are QCL-ed, and it is assumed that an antenna port associated with the second resource block group and an antenna port corresponding to a second CSI-RS resource are QCL-ed.
4. The method of claim 2 , wherein it is assumed that an antenna port associated with the first resource block group and a first cell-specific reference signal (CRS) antenna port generated based on a first physical cell identity (PCI) are QCL-ed and it is assumed that an antenna port associated with the second resource block group and a second CRS antenna port generated based on a second PCI are QCL-ed.
5. The method of claim 2 , further comprising:
receiving indexes of one or more resource blocks comprising the first resource block group and indexes of one or more resource blocks comprising the second resource block group.
6. The method of claim 2 , wherein a coding rate of the downlink data is limited to below a predetermined upper limit value.
7. The method of claim 1 , wherein the downlink data comprises a single codeword encoded from a single transport block.
8. The method of claim 1 , wherein the plurality of resources comprises a plurality of layers.
9. The method of claim 1 , wherein the downlink data is transmitted from a plurality of cells based on SFN (single frequency network) transmission.
10. The method of claim 9 , further comprising:
receiving a plurality of reference signals from the plurality of cells,
deriving a plurality of QCL related parameters based on each of the plurality of reference signals, and
decoding the downlink data based on a specific QCL related parameter.
11. The method of claim 10 ,
wherein each of the plurality of QCL related information includes resource indexes of the plurality of reference signals.
12. The method of claim 10 ,
wherein the specific QCL related parameter is a weighted average of the plurality of QCL related parameters.
13. The method of claim 10 , wherein the specific QCL related parameter is one of the plurality of QCL related parameters.
14. The method of claim 10 , wherein the specific QCL related parameter is a QCL related parameter based on a reference signal transmitted from a cell having a larger reference signal received power (RSRP) or a reference signal received quality (RSRQ) among the plurality of cells.
15. The method of claim 1 , wherein the first resources are indexed by even numbers and the second resources are indexed by odd numbers.
16. The method of claim 1 , wherein each of the plurality of QCL related information includes (i) information related with a reference signal for QCL and (ii) Cell index.
17. A user equipment (UE) configured to receive downlink data in a wireless communication system, the UE comprising:
at least one transceiver;
at least one processor; and
at least one computer memory connected to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:
receiving configuration information including a plurality of QCL(quasi-co-location) related information;
receiving downlink control information(DCI) including information indicating at least two of the plurality of QCL related information,
wherein a first QCL related information and a second QCL related information are indicated based on the DCI; and
receiving downlink data on a plurality of resources ,
wherein the plurality of resources comprise a first resources and a second resources that are non-overlapping in the frequency domain, and
wherein the first QCL related information is associated to the first resources and the second QCL related information is associated to the second resources.
18. A method for transmitting downlink data in a wireless communication system, the method performed by a base station (BS) comprising:
transmitting, to a user equipment (UE), configuration information including a plurality of QCL(quasi-co-location) related information;
transmitting, to the UE, downlink control information(DCI) including information indicating at least two of the plurality of QCL related information; and
transmitting, to the UE, downlink data on a plurality of resources ,
wherein the plurality of resources comprise a first resources and a second resources that are non-overlapping in the frequency domain, and
wherein based on a first QCL related information and a second QCL related information being indicated by the information, the first QCL related information is associated to the first resources and the second QCL related information is associated to the second resources.
19. A base station (BS) configured to transmit downlink data in a wireless communication system, the BS comprising:
at least one transceiver;
at least one processor; and
at least one computer memory connected to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:
transmitting, to a user equipment (UE), configuration information including a plurality of QCL(quasi-co-location) related information;
transmitting, to the UE, downlink control information(DCI) including information indicating at least two of the plurality of QCL related information; and
transmitting, to the UE, downlink data on a plurality of resources ,
wherein the plurality of resources comprise a first resources and a second resources that are non-overlapping in the frequency domain, and
wherein based on a first QCL related information and a second QCL related information being indicated by the information, the first QCL related information is associated to the first resources and the second QCL related information is associated to the second resources.