# US 2019/0246381 A1 · Method of transmitting and receiving downlink signal 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 2019/0246381 A1 - Document ID: US20190246381A1 - Status: Published application - Kind: A1 - Application number: 16/384,566 - Filed: 2019-04-15 - Published: 2019-08-08 - Earliest claimed: 2014-03-04 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Kijun KIM; Jonghyun PARK - Web page: https://patentgrep.com/patent/US20190246381A1 ## CPC - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04B 7/068: {using space frequency diversity (space-frequency coding H04L1/0606)} - H04B 7/0684: {using different training sequences per antenna} - H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)} - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/0473: {the resource being transmission power} - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - 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 According to one embodiment of the present invention, a method of receiving a downlink signal, which is received by a user equipment in a wireless communication system, includes the steps of receiving a TxPowerResourceConfigList for a user equipment which is not configured with a transmission mode 10 and one or more zeroTxPowerResourceConfigLists and receiving a DCI (downlink control channel) including a PRI (PDSCH RE mapping indicator). In this case, the user equipment can recognize whether a PDSCH (physical downlink shared channel) is mapped to REs (resource elements) to which a CSI-RS is transmittable using the one or more zeroTxPowerResourceConfigLists and the PRI. ## Claims ### Claim 1 A user equipment (UE) for receiving downlink signals in a wireless communication system, the UE comprising: a receiver; and at least one processor operably coupled to the receiver and configured to: control the receiver to receive information on a plurality of aperiodic zero-power channel state information-reference signal (CSI-RS) resources; control the receiver to receive a downlink control information (DCI) including a physical downlink shared channel resource element mapping indicator (PDSCH RE mapping indicator or PRI) field used for informing one of the plurality of aperiodic zero-power CSI-RS resources; and control the receiver to receive a physical downlink shared channel (PDSCH) scheduled by the DCI via first resource elements (REs) in a subframe, wherein the first REs are determined based on the information on the plurality of aperiodic zero-power CSI-RS resources and the PRI field, wherein the information on the plurality of aperiodic zero-power CSI-RS resources is received via radio resource control (RRC) signaling, and wherein the DCI is received via a physical downlink control channel (PDCCH) in the subframe. ### Claim 2 (depends on 1) The UE of claim 1, wherein the at least one processor configured to control the receiver to receive a CSI-RS via second REs determined based on the plurality of aperiodic zero-power CSI-RS resources and the PRI field, and wherein the first REs are determined to exclude the second REs. ### Claim 3 (depends on 1) The UE of claim 1, wherein the information on the plurality of aperiodic zero-power CSI-RS resources is received in a unit of a first periodicity and the DCI is received in a unit of a second periodicity, and wherein the first periodicity is larger than the second periodicity. ### Claim 4 A communication device for receiving a downlink signal in a wireless communication system, the communication device comprising: a memory; and at least one processor operably coupled to the memory and configured to: process received information on a plurality of aperiodic zero-power channel state information-reference signal (CSI-RS) resources; process a received downlink control information (DCI) including a physical downlink shared channel resource element mapping indicator (PDSCH RE mapping indicator or PRI) field used for informing one of the plurality of aperiodic zero-power CSI-RS resources; and process a received physical downlink shared channel (PDSCH) scheduled by the DCI via first resource elements (REs) in a subframe, wherein the first REs are determined based on the information on the plurality of aperiodic zero-power CSI-RS resources and the PRI field, wherein the information on the plurality of aperiodic zero-power CSI-RS resources is received via radio resource control (RRC) signaling, and wherein the DCI is received via a physical downlink control channel (PDCCH) in the subframe. ### Claim 5 (depends on 4) The communication device of claim 4, wherein the at least one processor configured to process a received CSI-RS via second REs determined based on the plurality of aperiodic zero-power CSI-RS resources and the PRI field, and wherein the first REs are determined to exclude the second REs. ### Claim 6 (depends on 4) The communication device of claim 4, wherein the information on the plurality of aperiodic zero-power CSI-RS resources is received in a unit of a first periodicity and the DCI is received in a unit of a second periodicity, and wherein the first periodicity is larger than the second periodicity. ### Claim 7 A base station (BS) for transmitting downlink signals in a wireless communication system, the BS comprising: a transmitter; and at least one processor operably coupled to the transmitter and configured to: control the transmitter to transmit information on a plurality of aperiodic zero-power channel state information-reference signal (CSI-RS) resources; control the transmitter to transmit a downlink control information (DCI) including a physical downlink shared channel resource element mapping indicator (PDSCH RE mapping indicator or PRI) field used for informing one of the plurality of aperiodic zero-power CSI-RS resources; and control the transmitter to transmit a physical downlink shared channel (PDSCH) scheduled by the DCI via first resource elements (REs) in a subframe, wherein the first REs are determined based on the information on the plurality of aperiodic zero-power CSI-RS resources and the PRI field, wherein the information on the plurality of aperiodic zero-power CSI-RS resources is transmitted via radio resource control (RRC) signaling, and wherein the DCI is transmitted via a physical downlink control channel (PDCCH) in the subframe. ### Claim 8 (depends on 7) The BS of claim 7, wherein the at least one processor configured to control the transmitter to transmit a CSI-RS via second REs determined based on the plurality of aperiodic zero-power CSI-RS resources and the PRI field, and wherein the first REs are determined to exclude the second REs. ### Claim 9 (depends on 7) The BS of claim 7, wherein the information on the plurality of aperiodic zero-power CSI-RS resources is transmitted in a unit of a first periodicity and the DCI is received in a unit of a second periodicity, and wherein the first periodicity is larger than the second periodicity.