# US 10,122,515 B2 · Method for sharing radio resource information in multi-cell wireless communication system and apparatus for same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,122,515 B2 - Document ID: US10122515B2 - Status: Granted - Kind: B2 - Application number: 14/758,454 - Filed: 2013-12-30 - Published: 2015-11-19 - Granted: 2018-11-06 - Earliest claimed: 2012-12-30 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Seungmin Lee; Jonghyun Park; Inkwon Seo; Hanbyul Seo - Web page: https://patentgrep.com/patent/US10122515B2 ## CPC - H04L 5/0057: {Physical resource allocation for CQI} - H04B 7/0417: Feedback systems - H04B 7/0486: {taking channel rank into account} - H04L 1/0026: {Transmission of channel quality indication} - H04L 5/0032: {Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 16/24: Cell structures - H04W 72/542: using measured or perceived quality - H04L 1/0031: {Multiple signaling transmission (H04L1/1664, F15 take precedence)} - 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: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present invention relates to a method and an apparatus for reporting channel state information of user equipment in a multi-cell wireless communication system. More particularly, the present invention comprises the steps of: receiving from a serving cell information on interference measurement resources (IMR) linked to at least one channel state information process (CSI process) and at least one item of CSI measurement information with respect to a plurality of radio resource sets having different interference characteristics; and reporting channel state information with respect to a specific radio resource set according to at least one item of information on the IMR and the at least one item of CSI measurement information, wherein the radio resource sets are defined so that uplink-downlink status changes depending on a system load state, and are linked to different channel state estimation processes. ## Claims ### Claim 1 A method for reporting channel state information (CSI) by a user equipment (UE) in a multi-cell wireless communication system, the method comprising: receiving a configuration for reporting CSI including information of interference measurement resources (IMRs) associated with at least one CSI process, via high layer signaling from a serving cell; and reporting the CSI corresponding to a specific CSI process configured by high layers among the at least one CSI process based on the configuration for reporting CSI, when a CSI reference resource associated with the specific CSI process is valid, wherein the CSI is reported based on resource-restricted CSI measurements, if two subframe sets for CSI measurement are configured by the configuration for reporting CSI, and wherein interference measurement for the CSI is configured to be derived using an IMR among the IMRs associated with one of the two subframe sets, which belong to the CSI reference resource, for the specific process, wherein when the CSI reference resource associated with the specific CSI process is not valid, the reporting the CSI is omitted. ### Claim 2 (depends on 1) The method according to claim 1, wherein the CSI includes at least one of a rank indicator, a channel quality indicator, and a precoding matrix index. ### Claim 3 A user equipment (UE) for reporting channel state information (CSI) in a multi-cell wireless communication system, the UE comprising: a radio frequency (RF) transceiver; and a processor configured to: control the RF transceiver to receive a configuration for reporting CSI including information of interference measurement resources (IMRs) associated with at least one CSI process, via high layer signaling from a serving cell, and control the RF transceiver to report the CSI corresponding to a specific CSI process configured by high layers among the at least one CSI process based on the configuration for reporting CSI when a CSI reference resource associated with the specific CSI process is valid, wherein the CSI is reported based on resource-restricted CSI measurements, if two subframe sets for CSI measurement are configured by the configuration for reporting CSI, and wherein interference measurement for the CSI is configured to be derived using an IMR among the IMRs associated with one of the two subframe sets, which belong to the CSI reference resource, for the specific process, wherein when the CSI reference resource associated with the Specific CSI process is not valid, the reporting the CSI by the RF transceiver is omitted. ### Claim 4 (depends on 1) The method according to claim 1, wherein each of the at least one CSI process is associated with a CSI-reference signal (CSI-RS) resource and at least one IMR. ### Claim 5 (depends on 1) The method according to claim 1, wherein the UE is configured with up to two IMRs for each CSI process of the at least one CSI process, if the UE is configured with the two subframe sets for CSI measurement. ### Claim 6 (depends on 1) The method according to claim 1, wherein the CSI is reported periodically or aperiodically by the high layer signaling.