# US 12,015,466 B2 · Method and apparatus for transmitting and receiving reference signal for sidelink channel state information acquisition > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,015,466 B2 - Document ID: US12015466B2 - Status: Granted - Kind: B2 - Application number: 17/956,755 - Filed: 2022-09-29 - Published: 2023-01-26 - Granted: 2024-06-18 - Earliest claimed: 2019-03-29 - Assignees: Kt Corporation - Applicants: Kt Corporation - Inventors: Kyujin Park - Web page: https://patentgrep.com/patent/US12015466B2 ## CPC - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04W 8/005: {Discovery of network devices, e.g. terminals} - H04L 1/0026: {Transmission of channel quality indication} - 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 5/0057: {Physical resource allocation for CQI} - H04L 5/0092: {Indication of how the channel is divided} - H04W 76/14: Direct-mode setup - H04W 48/16: Discovering, processing access restriction or access information - H04W 84/047: {using dedicated repeater stations} - H04W 88/04: adapted for relaying to or from another terminal or user - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Methods and apparatuses are provided for transmitting/receiving a reference signal for sidelink channel state information acquisition. In particular, a method of a transmitter UE is provided for transmitting a reference signal in order to acquire sidelink channel state information. The method may include: receiving enabling information of sidelink channel state information (CSI) reporting, determining whether to transmit a sidelink channel state information reference signal (SL CSI-RS) based on the enabling information of the CSI reporting, and transmitting the SL CSI-RS within a resource assigned for physical sidelink shared channel (PSSCH) transmission to the a receiver UE. ## Claims ### Claim 1 A method of a transmitting equipment for acquiring sidelink channel state information (CSI), the method comprising: transmitting, to a receiving equipment, information indicating to report the sidelink CSI through a sidelink control information (SCI) format; transmitting, to the receiving equipment, sidelink CSI reference signal (RS) in association with the information indicating to report the sidelink CSI; and acquiring the sidelink CSI based on sidelink CSI reporting from the receiving equipment, wherein the sidelink CSI RS is transmitted within a resource assigned for a physical sidelink shared channel (PSSCH) transmission, wherein the sidelink CSI RS is transmitted to the receiving equipment only if enabling information of the sidelink CSI reporting is received by the transmitting equipment, wherein the SCI format includes a specific value in a field for the information indicating to report the sidelink CSI, wherein a specific higher layer parameter is used for acquiring the sidelink CSI, wherein the sidelink CSI RS is transmitted based on configuration information by a higher layer signaling, and wherein the configuration information relates to a first parameter indicating a first orthogonal frequency division multiplexing (OFDM) symbol in a physical resource block (PRB used for the sidelink CSI RS and a second parameter indicating a number of antenna ports and a frequency domain allocation for the sidelink CSI RS. ### Claim 2 (depends on 1) The method according to claim 1, wherein the transmitting equipment transmits the CSI RS to the receiving equipment based on the first symbol and the frequency resource allocation information, within the resource assigned for PSSCH transmission. ### Claim 3 (depends on 1) The method according to claim 1, wherein the SCI format includes PSSCH assignment information, and wherein the enabling information of the sidelink CSI reporting is dynamically indicated by setting a value in an information region of the SCI format, the set value indicating to the transmitting receiver whether the sidelink CSI RS is to be transmitted through a PSSCH transmission corresponding to the PSSCH assignment information, the set value indicating to the receiving equipment whether the corresponding PSSCH transmission includes the sidelink CSI RS transmission. ### Claim 4 A method of a receiving equipment for reporting sidelink channel state information (CSI), the method comprising: receiving, from a transmitting equipment, information indicating to report the sidelink CSI through a sidelink control information (SCI) format; receiving, from the transmitting equipment, sidelink CSI reference signal (RS) in association with the information indicating to report the sidelink CSI; and performing sidelink CSI reporting based on the received sidelink CSI RS, wherein the sidelink CSI RS is received within a resource assigned for a physical sidelink shared channel (PSSCH) transmission, wherein the sidelink CSI RS is received by the receiving equipment only if enabling information of the sidelink CSI reporting is received by the transmitting equipment, wherein the SCI format includes a specific value in a field for the information indicating to report the sidelink CSI, wherein a specific higher layer parameter is used for acquiring the sidelink CSI, wherein the sidelink CSI RS is received based on configuration information by a higher layer signaling, and wherein the configuration information relates to a first parameter indicating a first orthogonal frequency division multiplexing (OFDM) symbol in a physical resource block (PRB) used for the sidelink CSI RS and a second parameter indicating a number of antenna ports and a frequency domain allocation for the sidelink CSI RS. ### Claim 5 (depends on 4) The method according to claim 4, wherein the receiving equipment receives the CSI RS from the transmitting equipment based on the first OFDM symbol and the frequency resource allocation, within the resource assigned for PSSCH transmission. ### Claim 6 (depends on 4) The method according to claim 4, wherein the SCI format includes PSSCH assignment information, and wherein the enabling information of the sidelink CSI reporting is dynamically indicated by setting a value in an information region of the SCI format, the set value indicating to the transmitting receiver whether the sidelink CSI RS is to be transmitted through a PSSCH transmission corresponding to the PSSCH assignment information, the set value indicating to the receiving equipment whether the corresponding PSSCH transmission includes the sidelink CSI RS transmission. ### Claim 7 A transmitting equipment for acquiring sidelink channel state information (CSI), the transmitting equipment comprising: a transmitter configured to transmit information indicating to report the sidelink CSI through a sidelink control information (SCI) format, and transmit sidelink CSI reference signal (RS) in association with the information indicating to report the sidelink CSI, to a receiving equipment; a receiver configured to receive sidelink CSI reporting from the receiving equipment; and a controller configured to acquire the sidelink CSI based on the sidelink CSI reporting, wherein the sidelink CSI RS is transmitted within a resource assigned for a physical sidelink shared channel (PSSCH) transmission, wherein the sidelink CSI RS is transmitted to the receiving equipment only if enabling information of the sidelink CSI reporting is received by the transmitting equipment, wherein the SCI format includes a specific value in a field for the information indicating to report the sidelink CSI, wherein a specific higher layer parameter is used for acquiring the sidelink CSI, wherein the sidelink CSI RS is transmitted based on configuration information by a higher layer signaling, and wherein the configuration information relates to a first parameter indicating a first orthogonal frequency division multiplexing (OFDM) symbol in a physical resource block (PRB) used for the sidelink CSI RS and a second parameter indicating a number of antenna ports and a frequency domain allocation for the sidelink CSI RS. ### Claim 8 (depends on 7) The transmitting equipment according to claim 7, wherein the transmitting equipment transmits the CSI RS to the receiving equipment based on the first OFDM symbol and the frequency domain allocation, within the resource assigned for PSSCH transmission. ### Claim 9 (depends on 7) The transmitting equipment according to claim 7, wherein the SCI format includes PSSCH assignment information, and wherein the enabling information of the sidelink CSI reporting is dynamically indicated by setting a value in an information region of the SCI format, the set value indicating to the transmitting receiver whether the sidelink CSI RS is to be transmitted through a PSSCH transmission corresponding to the PSSCH assignment information, the set value indicating to the receiving equipment whether the corresponding PSSCH transmission includes the sidelink CSI RS transmission.