# US 2021/0242918 A1 · Method for reporting channel state information in wireless communication system and apparatus for the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2021/0242918 A1 - Document ID: US20210242918A1 - Status: Published application - Kind: A1 - Application number: 17/235,139 - Filed: 2021-04-20 - Published: 2021-08-05 - Earliest claimed: 2017-11-24 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Hyungtae KIM; Jiwon KANG - Web page: https://patentgrep.com/patent/US20210242918A1 ## CPC - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting - H04B 7/0643: {Feedback on request} - H04B 7/0645: {Variable feedback} - H04L 1/0026: {Transmission of channel quality indication} - H04L 1/0027: {Scheduling of signalling, e.g. occurrence thereof} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 72/20: Control channels or signalling for resource management - H04W 72/542: using measured or perceived quality - Y02D 30/70: in wireless communication networks - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE ## Abstract A method of reporting, by a user equipment (UE), channel state information (CSI) in a wireless communication system, includes: receiving, by the UE and from a base station (BS), downlink control information (DCI) related to an aperiodic CSI report that is to be performed by the UE in a slot n; determining, by the UE, a value nCQI_ref based on a number of symbols Z′ related to a time for computing the CSI; determining, by the UE, a CSI reference resource as being a slot n n−nCQI_ref in a time domain that is to be used for the aperiodic CSI report; and transmitting, by the UE and to the BS, the aperiodic CSI report in the slot n, based on the CSI reference resource being slot n−nCQI_ref. The CSI may be calculated by using the most recent A CSI-RS, and thereby the most recent CSI may be reported. ## Claims ### Claim 1 A method of reporting, by a user equipment (UE), channel state information (CSI) in a wireless communication system, the method comprising: receiving, from a base station (BS), downlink control information (DCI) related to an aperiodic CSI report that is to be performed by the UE in a slot; determining a value nCQI_ref based on a number of symbols Z′ related to a time for computing the CSI; determining a CSI reference resource as being a slot n−nCQI_ref in a time domain that is to be used for the aperiodic CSI report; and transmitting, to the BS, the aperiodic CSI report in the slot n, based on the CSI reference resource being slot n−nCQI_ref, wherein the nCQI_ref is a smallest value greater than or equal to a threshold which depends on Z′ and Nsymbslot such that the slot n−nCQI_ref satisfies a valid downlink slot criteria, wherein Nsymbslot is a number of symbols which is equal to 14 symbols in one slot, and wherein for Z′ a positive integer smaller than 14 symbols, nCQI_ref is equal to zero. ### Claim 2 (depends on 1) The method of claim 1, wherein the valid downlink slot criteria is based at least on a DCI processing time. ### Claim 3 (depends on 1) The method of claim 1, further comprising: receiving, from the BS, an aperiodic reference signal (CSI-RS) in the CSI reference resource, slot n−nCQI_ref; determining the CSI based on the aperiodic CSI-RS; and generating the aperiodic CSI report based on the CSI. ### Claim 4 (depends on 1) The method of claim 1, further comprising: determining the number of symbols Z′ related to the time for computing the CSI based on a CSI complexity and a subcarrier spacing. ### Claim 5 (depends on 4) The method of claim 4, wherein the number of symbols Z′ does not include a DCI processing time. ### Claim 6 (depends on 1) The method of claim 1, wherein, based on the value nCQI_ref being equal to zero, the aperiodic CSI report is performed in a same slot as receiving the DCI. ### Claim 7 A user equipment (UE) configured to report channel state information (CSI) in a wireless communication system, the UE comprising: a transceiver configured to transmit and receive radio signals; at least one processor; and at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: receiving, from a base station (BS), downlink control information (DCI) related to an aperiodic CSI report that is to be performed by the UE in a slot n; determining a value nCQI_ref based on a number of symbols Z′ related to a time for computing the CSI; determining a CSI reference resource as being a slot n−nCQI_ref in a time domain that is to be used for the aperiodic CSI report; and transmitting, to the BS, the aperiodic CSI report in the slot n, based on the CSI reference resource being slot n−nCQI_ref, wherein the nCQI_ref is a smallest value greater than or equal to a threshold which depends on Z′ and Nsymbslot such that the slot n−nCQI_ref satisfies a valid downlink slot criteria, wherein Nsymbslot is a number of symbols which is equal to 14 symbols in one slot, and wherein for Z′ a positive integer smaller than 14 symbols, nCQI_ref is equal to zero. ### Claim 8 (depends on 7) The UE of claim 7, wherein the valid downlink slot criteria is based at least on a DCI processing time. ### Claim 9 (depends on 7) The UE of claim 7, wherein the operations further comprise: receiving, via the transceiver and from the BS, an aperiodic reference signal (CSI-RS) in the CSI reference resource, slot n−nCQI_ref; determining the CSI based on the aperiodic CSI-RS; and generating the aperiodic CSI report based on the CSI. ### Claim 10 (depends on 7) The UE of claim 7, wherein the operations further comprise: determining the number of symbols Z′ related to the time for computing the CSI based on a CSI complexity and a subcarrier spacing. ### Claim 11 (depends on 7) The UE of claim 7, wherein the number of symbols Z′ does not include a DCI processing time. ### Claim 12 (depends on 7) The UE of claim 7, wherein, based on the value nCQI_ref being equal to zero, the aperiodic CSI report is performed in a same slot as receiving the DCI. ### Claim 13 At least one computer-readable storage medium storing instructions that, based on being executed by at least one processor, control a user equipment (UE) to perform operations for reporting channel state information (CSI) in a wireless communication system, the operations comprising: receiving, from a base station (BS), downlink control information (DCI) related to an aperiodic CSI report; determining a value nCQI_ref based on a number of symbols Z′ related to a time for computing the CSI; determining a CSI reference resource as being a slot n−nCQI_ref in a time domain that is to be used for the aperiodic CSI report; and transmitting, to the base station (BS), the aperiodic CSI report in a slot n, based on the CSI reference resource being slot n−nCQI_ref, wherein the nCQI_ref is a smallest value greater than or equal to a threshold which depends on Z′ and Nsymbslot such that the slot n−nCQI_ref satisfies a valid downlink slot criteria, wherein Nsymbslot is a number of symbols which is equal to 14 symbols in one slot, and wherein for Z′ a positive integer smaller than 14 symbols, nCQI_ref is equal to zero. ### Claim 14 (depends on 13) The at least one computer-readable storage medium of claim 13, wherein the number of symbols Z′ does not include a DCI processing time. ### Claim 15 (depends on 13) The at least one computer-readable storage medium of claim 13, wherein, based on the value nCQI_ref being equal to zero, the aperiodic CSI report is transmitted in a same slot as receiving the DCI. ### Claim 16 A method of receiving, by a base station (BS), a channel state information (CSI) report in a wireless communication system, the method comprising: transmitting, by the BS to a user equipment (UE), downlink control information (DCI) related to an aperiodic CSI report that is to be received by the BS in a slot n; and receiving, by the BS from the UE, the aperiodic CSI report in the slot n, wherein the aperiodic CSI report is based on a CSI reference resource being slot n−nCQI_ref in a time domain, wherein the CSI reference resource in the slot n−nCQI_ref is to be used for the aperiodic CSI report, wherein the nCQI_ref is a smallest value greater than or equal to a threshold which depends on Z′ and Nsymbslot such that the slot n−nCQI_ref satisfies a valid downlink slot criteria, wherein Z″ is a number of symbols related to a time for computing CSI, and Nsymbslot is a number of symbols which is equal to 14 symbols in one slot, and wherein for Z′ a positive integer smaller than 14 symbols, nCQI_ref is equal to zero. ### Claim 17 (depends on 16) The method of claim 16, wherein the valid downlink slot criteria is based at least on a DCI processing time. ### Claim 18 (depends on 16) The method of claim 16, further comprising: transmitting, to the UE, an aperiodic reference signal (CSI-RS) in the CSI reference resource, slot n−nCQI_ref, wherein the CSI is determined based on the aperiodic CSI-RS, and wherein the aperiodic CSI report is generated based on the CSI. ### Claim 19 (depends on 16) The method of claim 16, wherein the number of symbols Z′ related to the time for computing the CSI is based on a CSI complexity and a subcarrier spacing. ### Claim 20 (depends on 19) The method of claim 19, wherein the number of symbols Z does not include a DCI processing time. ### Claim 21 (depends on 16) The method of claim 16, wherein the value nCQI_ref is equal to zero, and the aperiodic CSI report is received in a same slot as transmitting the DCI. ### Claim 22 A base station (BS) configured to receive a channel state information (CSI) report in a wireless communication system, the BS comprising: a transceiver configured to transmit and receive radio signals; at least one processor; and at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations comprising: transmitting, by the BS to a user equipment (UE), downlink control information (DCI) related to an aperiodic CSI report that is to be received by the BS in a slot n; and receiving, by the BS from the UE, the aperiodic CSI report in the slot n, wherein the aperiodic CSI report is based on a CSI reference resource being slot n−nCQI_ref in a time domain, wherein the CSI reference resource in the slot n−nCQI_ref is to be used for the aperiodic CSI report, wherein the nCQI_ref is a smallest value greater than or equal to a threshold which depends on Z′ and Nsymbslot such that the slot n−nCQI_ref satisfies a valid downlink slot criteria, wherein Z′ is a number of symbols related to a time for computing CSI, and Nsymbslot is a number of symbols which is equal to 14 symbols in one slot, and wherein for Z′ a positive integer smaller than 14 symbols, nCQI_ref is equal to zero. ### Claim 23 (depends on 22) The BS of claim 22, wherein the valid downlink slot criteria is based at least on a DCI processing time. ### Claim 24 (depends on 22) The BS of claim 22, wherein the operations further comprise: transmitting, to the UE, an aperiodic reference signal (CSI-RS) in the CSI reference resource, slot n−nCQI_ref, wherein the CSI is determined based on the aperiodic CSI-RS, and wherein the aperiodic CSI report is generated based on the CSI. ### Claim 25 (depends on 22) The BS of claim 22, wherein the number of symbols Z′ related to the time for computing the CSI is based on a CSI complexity and a subcarrier spacing. ### Claim 26 (depends on 25) The BS of claim 25, wherein the number of symbols Z′ does not include a DCI processing time. ### Claim 27 (depends on 22) The BS of claim 22, wherein the value nCQI_ref is equal to zero, and the aperiodic CSI report is received in a same slot as transmitting the DCI. ### Claim 28 At least one computer-readable storage medium storing instructions that, based on being executed by at least one processor, control a base station (BS) to perform operations for receiving a channel state information (CSI) report in a wireless communication system, the operations comprising: transmitting, to a user equipment (UE), downlink control information (DCI) related to an aperiodic CSI report that is to be received by the BS in a slot n; and receiving, from the UE, the aperiodic CSI report in the slot n, wherein the aperiodic CSI report is based on a CSI reference resource being slot n−nCQI_ref in a time domain, wherein the CSI reference resource in the slot n−nCQI_ref is to be used for the aperiodic CSI report, wherein the nCQI_ref is a smallest value greater than or equal to a threshold which depends on Z′ and Nsymbslot such that the slot n−nCQI_ref satisfies a valid downlink slot criteria, wherein Z′ is a number of symbols related to a time for computing CSI, and Nsymbslot is a number of symbols which is equal to 14 symbols in one slot, and wherein for Z′ a positive integer smaller than 14 symbols, nCQI_ref is equal to zero. ### Claim 29 (depends on 28) The at least one computer-readable storage medium of claim 28, wherein the number of symbols Z′ does not include a DCI processing time. ### Claim 30 (depends on 28) The at least one computer-readable storage medium of claim 28, wherein the value nCQI_ref is equal to zero, and the aperiodic CSI report is received in a same slot as transmitting the DCI.