# US 9,521,665 B2 · Method and apparatus for transmitting/receiving downlink signal considering antenna port relationship in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,521,665 B2 - Document ID: US9521665B2 - Status: Granted - Kind: B2 - Application number: 14/420,257 - Filed: 2013-09-16 - Published: 2015-07-23 - Granted: 2016-12-13 - Earliest claimed: 2012-09-16 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Jonghyun Park; Eunsun Kim; Hanbyul Seo; Kijun Kim; Byounghoon Kim - Web page: https://patentgrep.com/patent/US9521665B2 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - 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 5/0035: {Resource allocation in a cooperative multipoint environment} - H04L 5/0094: {Indication of how sub-channels of the path are allocated} - H04L 27/2656: {Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract The present invention relates to a wireless communication system, and more specifically, to a method and an apparatus for transmitting or receiving a downlink signal considering an antenna port relationship. The method for enabling a terminal to receive a physical downlink sharing channel (PDSCH) signal in the wireless communication system according to one embodiment of the present invention can determine a PDSCH start symbol index according to the predetermined priority and receive the PDSCH signal therethrough. The PDSCH start symbol index can be determined when a PDSCH start symbol value included in a PDSCH resource element mapping and Quasi co-location Indicator (PQI) parameter set is determined by an upper layer. The PDSCH start symbol index can be determined according to the PDSCH start symbol value for a cell receiving the PDSCH when the PDSCH start symbol value included in the PQI parameter set is not determined by the upper layer. ## Claims ### Claim 1 A method for receiving a physical downlink shared channel (PDSCH) signal by a user equipment (UE) in a wireless communication system, the method comprising: determining a start symbol index of the PDSCH in a downlink subframe; and receiving the PDSCH signal based on the start symbol index, wherein, when a PDSCH start symbol value contained in a PDSCH resource element mapping and Quasi co-location Indicator (PQI) parameter set is configured for the UE by a higher layer, the start symbol index is determined according to the PDSCH start symbol value contained in the PQI parameter set, wherein, when the PDSCH start symbol value contained in the PQI parameter set is not configured for the UE by the higher layer, and a PDSCH start symbol value for a cell via which the PDSCH is received is configured by the higher layer, the start symbol index is determined according to the PDSCH start symbol value for the cell via which the PDSCH is received. ### Claim 2 (depends on 1) The method according to claim 1, wherein the PDSCH is allocated according to downlink control information (DCI) of a physical downlink control channel (PDCCH) or an enhanced PDCCH (EPDCCH). ### Claim 3 (depends on 2) The method according to claim 2, wherein, when the DCI is configured according to DCI format 2D, the PQI parameter set is determined according to a state value of a PQI field of the DCI format 2D. ### Claim 4 (depends on 2) The method according to claim 2, wherein, when the DCI is configured according to DCI format 1A, the PQI parameter set is a PQI parameter set having a lowest index. ### Claim 5 (depends on 2) The method according to claim 2, wherein, when a cell via which the PDCCH or the EPDCCH is received is different from the cell via which the PDSCH is received, the start symbol index is determined according to the PDSCH start symbol value for the cell via which the PDSCH is received. ### Claim 6 (depends on 1) The method according to claim 1, wherein the PQI parameter set comprises at least one of parameters corresponding to number-of-CRS (Cell-specific Reference Signal) ports information, CRS frequency shift information, Multicast Broadcast Single Frequency Network (MBSFN) subframe configuration information, Zero Power Channel State Information Reference Signal (ZP CSI-RS) configuration information, the PDSCH start symbol value, and Non-Zero Power (NZP) CSI-RS configuration information. ### Claim 7 (depends on 1) The method according to claim 1, wherein the PDSCH start symbol value contained in the PQI parameter set is one of 1, 2, 3 and 4. ### Claim 8 (depends on 1) The method according to claim 1, wherein, when the PDSCH start symbol value contained in the PQI parameter set is not configured for the UE by the higher layer, and the PDSCH start symbol value for the cell via which the PDSCH is received is not configured by the higher layer, the start symbol index is determined based on a control format indicator (CFI) value. ### Claim 9 (depends on 1) The method according to claim 1, wherein the UE is set to transmission mode 10 (TM10). ### Claim 10 (depends on 1) The method according to claim 1, wherein the PDSCH start symbol index indicates a start Orthogonal Frequency Division Multiplexing (OFDM) symbol from which the PDSCH mapped in the downlink subframe. ### Claim 11 A user equipment (UE) for receiving a physical downlink shared channel (PDSCH) signal in a wireless communication system, the UE comprising: a transmit module; a receive module; and a processor, wherein the processor is configured to determine a start symbol index of the PDSCH in a downlink subframe and to receive the PDSCH signal based on the start symbol index, wherein, when a PDSCH start symbol value contained in a PDSCH resource element mapping and Quasi co-location Indicator (PQI) parameter set is configured for the UE by a higher layer, the start symbol index is determined according to the PDSCH start symbol value contained in the PQI parameter set, wherein, when the PDSCH start symbol value contained in the PQI parameter set is not configured for the UE by the higher layer, and a PDSCH start symbol value for a cell via which the PDSCH is received is configured by the higher layer, the start symbol index is determined according to the PDSCH start symbol value for the cell via which the PDSCH is received.