# US 2018/0323830 A1 · Method for transmitting and receiving downlink data in wireless communication system, and apparatus therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0323830 A1 - Document ID: US20180323830A1 - Status: Published application - Kind: A1 - Application number: 15/773,793 - Filed: 2016-11-04 - Published: 2018-11-08 - Earliest claimed: 2015-11-04 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Jonghyun PARK; Hanbyul SEO - Web page: https://patentgrep.com/patent/US20180323830A1 ## CPC - 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 - H04L 5/001: {the frequencies being arranged in component carriers} - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 25/02: Details {; arrangements for supplying electrical power along data transmission lines (systems for transmitting signals via power distribution lines H04B3/54)} - H04L 5/0023: {Time-frequency-space} - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - H04L 2001/0093: {Point-to-multipoint} - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## 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 ### Claim 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. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 1) 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. ### Claim 4 (depends on 1) 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. ### Claim 5 (depends on 1) 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. ### Claim 6 (depends on 1) The method of claim 1, wherein when the PDSCH is transmitted, a coding rate is limited to below a predetermined upper limit value. ### Claim 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. ### Claim 8 (depends on 7) 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. ### Claim 9 (depends on 7) 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. ### Claim 10 (depends on 9) 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. ### Claim 11 (depends on 7) 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. ### Claim 12 (depends on 11) 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. ### Claim 13 (depends on 7) 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.