# US 10,484,070 B2 · Method and apparatus for channel state information reference signal (CSI-RS) > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,484,070 B2 - Document ID: US10484070B2 - Status: Granted - Kind: B2 - Application number: 16/415,889 - Filed: 2019-05-17 - Published: 2019-09-05 - Granted: 2019-11-19 - Earliest claimed: 2015-12-30 - Assignees: Samsung Electronics Co., Ltd. - Applicants: Samsung Electronics Co., Ltd. - Inventors: Eko Onggosanusi; Hongbo Si; Thomas David Novlan; Hoondong Noh; Youngwoo Kwak - Web page: https://patentgrep.com/patent/US10484070B2 ## CPC - H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]} - H04B 7/0479: {for multi-dimensional arrays, e.g. horizontal or vertical pre-distortion matrix index [PMI]} - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04L 1/0026: {Transmission of channel quality indication} - H04L 1/0027: {Scheduling of signalling, e.g. occurrence thereof} - 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)} - H04W 72/20: Control channels or signalling for resource management - H04B 7/0413: MIMO systems - H04L 5/0057: {Physical resource allocation for CQI} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 48/12: using downlink control channel - 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) ## Abstract Methods and apparatuses for CSI reporting mechanisms are provided. A user equipment (UE) includes a transceiver and a processor operably connected to the transceiver. The transceiver is configured to receive information indicating a channel state information reference signal (CSI-RS) resource configuration, uplink-related downlink control information (DCI), and a CSI-RS associated with a selected CSI-RS resource in a same subframe as the uplink-related DCI. The processor configured to determine, in response to a CSI request included in the uplink-related DCI, an aperiodic CSI in reference to the CSI-RS. The transceiver is further configured to report the aperiodic CSI by transmitting the aperiodic CSI on an uplink channel. ## Claims ### Claim 1 A method of transmitting channel state information (CSI) by a terminal in a wireless communication system, the method comprising: receiving, from a base station, first information for configuring a set of CSI reference signal (CSI-RS) resources; receiving, from the base station, second information for selecting at least one CSI-RS resource from the set of CSI-RS resources; receiving, from the base station, downlink control information (DCI) requesting a report of a CSI, the DCI indicating a CSI-RS resource among the at least one CSI-RS resource; calculating a CSI parameter based on a CSI-RS corresponding to the indicated CSI-RS resource; and transmitting, to the base station, the CSI based on the calculated CSI parameter. ### Claim 2 (depends on 1) The method of claim 1, wherein a message including the first information further comprises third information on an offset between a slot containing the DCI and a slot in which the CSI-RS is received, and wherein the message further includes fourth information for configuring a report for the set of CSI-RS resources to be aperiodic. ### Claim 3 (depends on 2) The method of claim 2, wherein the second information indicates the selected at least one CSI-RS resource by using a bitmap, and wherein each bit of the bitmap corresponds to a CSI-RS resource in the set of CSI-RS resources. ### Claim 4 (depends on 3) The method of claim 3, wherein the message is received by radio resource control (RRC) signaling, and wherein the second information is included in a medium access control (MAC) control element (CE). ### Claim 5 A terminal of transmitting channel state information (CSI) in a wireless communication system, the terminal comprising: a transceiver configured to transmit and receive signals; and a controller configured to: receive, from a base station, first information for configuring a set of CSI reference signal (CSI-RS) resources, receive, from the base station, second information for selecting at least one CSI-RS resource from the set of CSI-RS resources, receive, from the base station, downlink control information (DCI) requesting a report of a CSI, the DCI indicating a CSI-RS resource among the at least one CSI-RS resource, calculate a CSI parameter based on a CSI-RS corresponding to the indicated CSI-RS resource, and transmit, to the base station, the CSI based on the calculated CSI parameter. ### Claim 6 (depends on 5) The terminal of claim 5, wherein a message including the first information further comprises third information on an offset between a slot containing the DCI and a slot in which the CSI-RS is received, and wherein the message further includes fourth information for configuring a report for the set of CSI-RS resources to be aperiodic. ### Claim 7 (depends on 6) The terminal of claim 6, wherein the second information indicates the selected at least one CSI-RS resource by using a bitmap, and wherein each bit of the bitmap corresponds to a CSI-RS resource in the set of CSI-RS resources. ### Claim 8 (depends on 7) The terminal of claim 7, wherein the message is received by a radio resource control (RRC) signaling, and wherein the second information is included in a medium access control (MAC) control element (CE). ### Claim 9 A method of receiving channel state information (CSI) by a base station in a wireless communication system, the method comprising: transmitting, to a terminal, first information for configuring a set of CSI reference signal (CSI-RS) resources; transmitting, to the terminal, second information for selecting at least one CSI-RS resource from the set of CSI-RS resources; transmitting, to the terminal, downlink control information (DCI) requesting a report of a CSI, the DCI indicating a CSI-RS resource among the at least one CSI-RS resources; and receiving, from the terminal, a CSI calculated based on a CSI-RS corresponding to the indicated CSI-RS resource. ### Claim 10 (depends on 9) The method of claim 9, wherein a message including the first information further comprises third information on an offset between a slot containing the DCI and a slot in which the CSI-RS is transmitted, and wherein the message further includes fourth information for configuring a report for the set of CSI-RS resources to be aperiodic. ### Claim 11 (depends on 10) The method of claim 10, wherein the second information indicates the selected at least one CSI-RS resource by using a bitmap, wherein each bit of the bitmap corresponds to a CSI-RS resource in the set of CSI-RS resources, wherein the message is transmitted by a radio resource control (RRC) signaling, and wherein the second information is included in a medium access control (MAC) control element (CE). ### Claim 12 A base station of receiving channel state information (CSI) in a wireless communication system, the base station comprising: a transceiver configured to transmit and receive signals; and a controller configured to: transmit, to a terminal, first information for configuring a set of CSI reference signal (CSI-RS) resources, transmit, to the terminal, second information for selecting at least one CSI-RS resource from the set of CSI-RS resources, transmit, to the terminal, downlink control information (DCI) requesting a report of a CSI, the DCI indicating a CSI-RS resource among the at least one CSI-RS resource, and receive, from the terminal, a CSI calculated based on a CSI-RS corresponding to the indicated CSI-RS resource. ### Claim 13 (depends on 12) The base station of claim 12, wherein a message including the first information further comprises third information on an offset between a slot containing the DCI and a slot in which the CSI-RS is transmitted, and wherein the message further includes fourth information for configuring a report for the set of CSI-RS resources to be aperiodic. ### Claim 14 (depends on 13) The base station of claim 13, wherein the second information indicates the selected at least one CSI-RS resource by using a bitmap, and wherein each bit of the bitmap corresponds to a CSI-RS resource in the set of CSI-RS resources. ### Claim 15 (depends on 13) The base station of claim 13, wherein the message is transmitted by a radio resource control (RRC) signaling, and wherein the second information is included in a medium access control (MAC) control element (CE).