METHOD FOR TRANSMITTING AND RECEIVING DOWNLINK DATA IN WIRELESS COMMUNICATION SYSTEM, AND APPARATUS THEREFOR

• US 20180323830A1
• Filed: 11/04/2016
• Published: 11/08/2018
• Est. Priority Date: 11/04/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: PARK, Jonghyun, SEO, Hanbyul
• Granted Patent: US 11,121,744 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04L 2001/0093 Point-to-multipoint
• CPC Class Codes: H04L 25/02 Details ; arrangements for supplying electrical power along data transmission lines systems for transmitting signals via power distribution lines H04B3/54
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0044 allocation of payload
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals

Abstract

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.

Claims

1. A method for receiving downlink data from multiple cells in a wireless communication system, the method comprising:

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 and 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 to decode the first resource block group and the second resource block group.

2. The method of claim 1, wherein

it is assumed that an antenna port associated with the first resource block group and an antenna port corresponding to 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.

3. The method of claim 1, 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.

4. The method of claim 1, further comprising:

receiving a non-zero power (NZP) CSI-RS resource index to which an QCL assumption is applied and/or a PCI for a CRS to which an QCL assumption is applied for each of the first resource block group and the second resource block group.

5. The method of claim 1, further comprising:

receiving indexes of one or more resource blocks constituting the first resource block group and indexes of one or more resource blocks constituting the second resource block group.

6. The method of claim 1, wherein

when the PDSCH is transmitted, a coding rate is limited to below a predetermined upper limit value.

7. A method for receiving downlink data from multiple cells in a wireless communication system, the method comprising:

deriving a first large-scale parameter using a first reference signal (RS) received from a first cell;

deriving a second large-scale parameter using a second RS received from a second cell;

deriving a third large-scale parameter based on the first large-scale parameter and the second large-scale parameter; and

decoding a physical downlink shared channel (PDSCH) which is single frequency network (SFN)-transmitted in the first cell and the second cell using the derived third large-scale parameter.

8. The method of claim 7, wherein

the third large-scale parameter is derived by weighted-averaging the first large-scale parameter and the second large-scale parameter.

9. The method of claim 7, wherein

the third large-scale parameter is derived by any one of the first large-scale parameter and the second large-scale parameter.

10. The method of claim 9, wherein

the third large-scale parameter is derived as a large-scale parameter for a cell having a larger reference signal received power (RSRP) or a reference signal received quality (RSRQ), among the first cell and the second cell.

11. The method of claim 7, wherein the first RS and the second RS are transmitted to different antenna ports, and after channels are estimated by the first RS and the second RS, respectively, the respective channel estimated values are superpositioned to calculate a third channel estimated value, and the PDSCH is demodulated based on the third channel estimated value.

12. The method of claim 11, wherein

a sequence of the first RS and a sequence of the second RS are generated based on the same seed value, and mutually orthogonal sequences are applied to the first RS and the second RS.

13. The method of claim 7, wherein

the PDSCH is transmitted to rank 2, the first cell and the second cell each transmit a layer, and a single codeword is transmitted across the layer of the first cell and the layer of the second cell.