# US 11,452,083 B2 · 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 11,452,083 B2 - Document ID: US11452083B2 - Status: Granted - Kind: B2 - Application number: 16/777,477 - Filed: 2020-01-30 - Published: 2020-05-28 - Granted: 2022-09-20 - Earliest claimed: 2014-03-04 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Kijun Kim; Jonghyun Park - Web page: https://patentgrep.com/patent/US11452083B2 ## 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 method for a user equipment (UE) to report channel state information (CSI) in a wireless communication system, the method comprising: receiving, from a base station (BS) via radio resource control (RRC) signaling, information on plural aperiodic channel state information-reference signal (CSI-RS) measurement configurations, receiving, from the BS in a first time interval, downlink control information (DCI) comprising a field having a bit length and value corresponding to one of the plural aperiodic CSI-RS measurement configurations, receiving a aperiodic CSI-RS in a second time interval according to the one of the plural aperiodic CSI-RS measurement configurations, wherein the second time interval is determined based on the first time interval, performing an aperiodic CSI-RS measurement on the aperiodic CSI-RS, and reporting CSI based on the aperiodic CSI-RS measurement, wherein first resource elements (REs) for the aperiodic CSI-RS are different from second REs for a physical downlink shared channel (PDSCH). ### Claim 2 (depends on 1) The method of claim 1, wherein the plural aperiodic CSI-RS measurement configurations include information on the aperiodic CSI-RS. ### Claim 3 (depends on 1) The method of claim 1, wherein the first time interval and the second time interval are set to one of a same time interval or a different time interval. ### Claim 4 (depends on 1) The method of claim 1, wherein a number of the plural aperiodic CSI-RS configurations is related to the bit length of the field of the DCI. ### Claim 5 A user equipment (UE) for reporting channel state information (CSI) in a wireless communication system, the method comprising: a memory; a transceiver; and a processor operatively connected to the memory and the transceiver, the processor for: receiving, from a base station (BS) via radio resource control (RRC) signaling, information on plural aperiodic channel state information-reference signal (CSI-RS) measurement configurations, receiving, from the BS in a first time interval, downlink control information (DCI) comprising a field having a bit length and value corresponding to one of the plural aperiodic CSI-RS measurement configurations, receiving a aperiodic CSI-RS in a second time interval according to the one of the plural aperiodic CSI-RS measurement configurations, wherein the second time interval is determined based on the first time interval, performing an aperiodic CSI-RS measurement on the aperiodic CSI-RS, and reporting CSI based on the aperiodic CSI-RS measurement, wherein first resource elements (REs) for the aperiodic CSI-RS are different from second REs for a physical downlink shared channel (PDSCH). ### Claim 6 (depends on 5) The UE of claim 5, wherein the plural aperiodic CSI-RS measurement configurations include information on the aperiodic CSI-RS. ### Claim 7 (depends on 5) The UE of claim 5, wherein the first time interval and the second time interval are set to one of a same time interval or a different time interval. ### Claim 8 (depends on 5) The UE of claim 5, wherein a number of the plural aperiodic CSI-RS configurations is related to the bit length of the field of the DCI. ### Claim 9 An apparatus, comprising: a memory; and a processor coupled to the memory, the processor for: receiving, from a base station (BS) via radio resource control (RRC) signaling, information on plural aperiodic channel state information-reference signal (CSI-RS) measurement configurations, receiving, from the BS in a first time interval, downlink control information (DCI) comprising a field having a bit length and value corresponding to one of the plural aperiodic CSI-RS measurement configurations, receiving a aperiodic CSI-RS in a second time interval according to the one of the plural aperiodic CSI-RS measurement configurations, wherein the second time interval is determined based on the first time interval, performing an aperiodic CSI-RS measurement on the aperiodic CSI-RS, and reporting CSI based on the aperiodic CSI-RS measurement, wherein first resource elements (REs) for the aperiodic CSI-RS are different from second REs for a physical downlink shared channel (PDSCH). ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the plural aperiodic CSI-RS measurement configurations include information on the aperiodic CSI-RS. ### Claim 11 (depends on 9) The apparatus of claim 9, wherein the first time interval and the second time interval are set to one of a same time interval or a different time interval. ### Claim 12 (depends on 9) The apparatus of claim 9, wherein a number of the plural aperiodic CSI-RS configurations is related to the bit length of the field of the DCI.