# US 12,604,314 B2 · Channel state information (CSI) processing for UE initiated CSI and downlink grant CSI > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,604,314 B2 - Document ID: US12604314B2 - Status: Granted - Kind: B2 - Application number: 18/003,674 - Filed: 2021-08-13 - Published: 2023-08-03 - Granted: 2026-04-14 - Earliest claimed: 2021-08-13 - Assignees: QUALCOMM Incorporated - Applicants: QUALCOMM Incorporated - Inventors: Chenxi Hao; Yu Zhang; Chao Wei; Fang Yuan; Liangming Wu; Qiaoyu Li; Wanshi Chen; Hao Xu - Web page: https://patentgrep.com/patent/US12604314B2 ## CPC - H04L 5/0044: {Allocation of payload; Allocation of data channels, e.g. PDSCH or PUSCH} - H04W 72/1273: of downlink data flows - H04L 1/0028: {Formatting} - H04L 1/1671: {the supervisory signal being transmitted together with control information} - H04L 1/1812: Hybrid protocols; Hybrid automatic repeat request [HARQ] - H04L 1/1822: involving configuration of automatic repeat request [ARQ] with parallel processes - H04L 1/1854: {Scheduling and prioritising arrangements} - H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal} - H04L 5/0057: {Physical resource allocation for CQI} - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04L 1/1861: {Physical mapping arrangements (for ACK signaling see also H04L5/0053)} - H04L 1/1896: {ARQ related signaling} - H04L 5/0055: {Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861)} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - 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) ## Abstract This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for transmitting a channel state information (CSI) report from a user equipment (UE). The CSI report may be a UE initiated CSI report or may be based on a downlink grant. The UE may receive a downlink grant scheduling a physical downlink shared channel (PDSCH) and a demodulation reference signal (DMRS). The UE may determine to report a CSI in response to a measurement of a downlink measurement resource or in response to the downlink grant requesting the CSI. The UE may determine a reserved uplink resource on which to report the CSI. The UE may transmit a CSI report on the reserved uplink resource. ## Claims ### Claim 1 A method of wireless communication, comprising, by a user equipment (UE): receiving a downlink grant scheduling a physical downlink shared channel (PDSCH) and a demodulation reference signal (DMRS); determining to report a channel state information (CSI) in response to a measurement of a downlink measurement resource when a measured spectral efficiency of the downlink measurement resource differs from a spectral efficiency indicated for the PDSCH by more than a threshold; determining a reserved uplink resource on which to report the CSI; and transmitting a CSI report on the reserved uplink resource. ### Claim 2 (depends on 1) The method of claim 1, wherein the measured spectral efficiency is one of a channel quality indicator (CQI) or a measured feasible modulation and coding scheme (MCS). ### Claim 3 (depends on 1) The method of claim 1, further comprising receiving a command indicating that UE initiated CSI reporting based on the measurement is activated. ### Claim 4 (depends on 3) The method of claim 3, wherein the UE initiated CSI reporting based on the measurement remains active until a deactivation command is received or for a number of CSI transmission opportunities. ### Claim 5 (depends on 1) The method of claim 1, further comprising receiving a CSI report configuration associated with one or more resource settings that define the downlink measurement resource including a channel measurement resource (CMR), wherein the CMR is either a NZP-CSI-RS resource setting or a DMRS or PDSCH (DMRS/PDSCH) resource setting. ### Claim 6 (depends on 5) The method of claim 5, wherein the downlink measurement resource includes one or more interference measurement resources (IMR) selected from the group consisting of: a DMRS/PDSCH resource, a non-zero power (NZP) CSI reference signal (NZP-CSI-RS), and a CSI-RS resource for interference measurement (CSI-IM). ### Claim 7 (depends on 5) The method of claim 5, wherein the CSI report configuration defines the reserved uplink resource per CMR or per hybrid automatic repeat request (HARQ) process number. ### Claim 8 (depends on 5) The method of claim 5, wherein the CSI report configuration defines an uplink resource for each of the one or more resource settings. ### Claim 9 (depends on 8) The method of claim 8, wherein the CSI report configuration is associated with a single DMRS/PDSCH CMR or single HARQ process number. ### Claim 10 (depends on 8) The method of claim 8, wherein the CSI report includes a HARQ process number of the PDSCH. ### Claim 11 (depends on 1) The method of claim 1, wherein the downlink measurement resource is the DMRS and the CSI report includes a channel quality indicator (CQI). ### Claim 12 (depends on 11) The method of claim 11, wherein the CQI is a single bit indicating whether a feasible CQI or MCS is less than an indicated MCS for the PDSCH by more than a threshold. ### Claim 13 (depends on 11) The method of claim 11, wherein the CQI is a single bit, where a first codepoint of the single bit indicates that a feasible CQI or MCS is less than an indicated MCS for the PDSCH by more than a threshold and a second codepoint of the single bit indicates that the feasible CQI or MCS is greater than the indicated MCS by more than the threshold. ### Claim 14 (depends on 11) The method of claim 11, wherein the CQI indicates a 4-bit CQI value or a 2-bit CQI differential relative to an indicated MCS for the PDSCH. ### Claim 15 (depends on 14) The method of claim 14, wherein the CSI report includes a rank indicator and a value of the CQI is based on the rank indicator. ### Claim 16 An apparatus for wireless communication, comprising: a memory storing computer-executable instructions; a transceiver; and a processing system coupled to the memory and the transceiver and configured to execute the instructions to: receive, via the transceiver, a downlink grant scheduling a physical downlink shared channel (PDSCH) and a demodulation reference signal (DMRS); determine to report a channel state information (CSI) in response to a measurement of a downlink measurement resource when a measured spectral efficiency of the downlink measurement resource differs from a spectral efficiency indicated for the PDSCH by more than a threshold; determine a reserved uplink resource on which to report the CSI; and transmit, via the transceiver, a CSI report on the reserved uplink resource. ### Claim 17 (depends on 16) The apparatus of claim 16, wherein the measured spectral efficiency is one of a channel quality indicator (CQI) or a measured feasible modulation and coding scheme (MCS). ### Claim 18 (depends on 16) The apparatus of claim 16, wherein the processing system is configured to receive, via the transceiver, a command indicating that UE initiated CSI reporting based on the measurement is activated. ### Claim 19 (depends on 18) The apparatus of claim 18, wherein the processing system is configured to keep the UE initiated CSI reporting based on the measurement activated until a deactivation command is received or for a number of CSI transmission opportunities. ### Claim 20 (depends on 16) The apparatus of claim 16, wherein the processing system is configured to receive a CSI report configuration associated with one or more resource settings that define the downlink measurement resource including a channel measurement resource (CMR), wherein the CMR is either a NZP-CSI-RS resource setting or a DMRS or PDSCH (DMRS/PDSCH) resource setting. ### Claim 21 (depends on 20) The apparatus of claim 20, wherein the downlink measurement resource includes one or more interference measurement resources (IMR) selected from the group consisting of: a DMRS/PDSCH resource, a non-zero power (NZP) CSI reference signal (NZP-CSI-RS), and a CSI-RS resource for interference measurement (CSI-IM). ### Claim 22 (depends on 20) The apparatus of claim 20, wherein the CSI report configuration defines an uplink resource for each of the one or more resource settings. ### Claim 23 (depends on 16) The apparatus of claim 16, wherein the downlink measurement resource is the DMRS and the CSI report includes a channel quality indicator (CQI). ### Claim 24 (depends on 16) The apparatus of claim 16, wherein the processing system is configured to receive a CSI report configuration that defines the reserved uplink resource per channel measurement resource (CMR) or per hybrid automatic repeat request (HARQ) process number. ### Claim 25 An apparatus for wireless communication, comprising: means for receiving a downlink grant scheduling a physical downlink shared channel (PDSCH) and a demodulation reference signal (DMRS); means for determining to report a channel state information (CSI) in response to a measurement of a downlink measurement resource when a measured spectral efficiency of the downlink measurement resource differs from a spectral efficiency indicated for the PDSCH by more than a threshold; means for determining a reserved uplink resource on which to report the CSI; and means for transmitting a CSI report on the reserved uplink resource. ### Claim 26 (depends on 25) The apparatus of claim 25, further comprising means for receiving a command indicating that UE initiated CSI reporting based on the measurement is activated. ### Claim 27 (depends on 25) The apparatus of claim 25, further comprising means for receiving a CSI report configuration associated with one or more resource settings that define the downlink measurement resource including a channel measurement resource (CMR), wherein the CMR is either a NZP-CSI-RS resource setting or a DMRS or PDSCH (DMRS/PDSCH) resource setting. ### Claim 28 (depends on 25) The apparatus of claim 25, further comprising means for receiving a CSI report configuration that defines the reserved uplink resource per channel measurement resource (CMR) or per hybrid automatic repeat request (HARQ) process number. ### Claim 29 A non-transitory computer-readable medium storing computer executable code, the code when executed by a processor causes the processor to: receive a downlink grant scheduling a physical downlink shared channel (PDSCH) and a demodulation reference signal (DMRS); determine to report a channel state information (CSI) in response to a measurement of a downlink measurement resource when a measured spectral efficiency of the downlink measurement resource differs from a spectral efficiency indicated for the PDSCH by more than a threshold; determine a reserved uplink resource on which to report the CSI; and transmit a CSI report on the reserved uplink resource. ### Claim 30 (depends on 29) The non-transitory computer-readable medium of claim 29, further comprising code to receive a CSI report configuration that defines the reserved uplink resource per channel measurement resource (CMR) or per hybrid automatic repeat request (HARQ) process number.