# US 9,439,090 B2 · Method for measuring intensity of interference signal based on CSI-RS in 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 9,439,090 B2 - Document ID: US9439090B2 - Status: Granted - Kind: B2 - Application number: 14/377,702 - Filed: 2013-02-28 - Published: 2015-01-15 - Granted: 2016-09-06 - Earliest claimed: 2012-02-28 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Hyungtae Kim; Jonghyun Park; Kijun Kim - Web page: https://patentgrep.com/patent/US9439090B2 ## CPC - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04B 7/024: Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems - H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]} - H04B 7/0684: {using different training sequences per antenna} - H04B 17/345: Interference values ({signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR]} H04B17/336) - 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)} - H04B 1/1027: {assessing signal quality or detecting noise/interference for the received signal} - H04L 1/0026: {Transmission of channel quality indication} - H04L 5/0023: {Time-frequency-space} - H04L 5/0035: {Resource allocation in a cooperative multipoint environment} - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Disclosed is a method for measuring the intensity of an interference signal by a terminal in a wireless communication system. More particularly, a method for measuring the intensity of an interference signal from a first base station by a terminal in a coordinated multipoint (CoMP) environment comprises: a step of receiving a plurality of channel status information-reference signals (CSI-RSs) from a second base station; a step of receiving downlink signals output from a plurality of resource element (RE) pairs corresponding to the respective plurality of CSI-RSs from the first base station; and a step of measuring a plurality of interference intensities based on the plurality of CSI-RSs and the received downlink signals. ## Claims ### Claim 1 A method of measuring strength of an interference signal from a first eNode B measured by a user equipment in a CoMP (coordinated multipoint) environment, the method comprising: receiving a plurality of CSI-RSs (channel status information-reference signals) from a second eNode B using a first resource element (RE) pair and a second RE pair; receiving a downlink signal from the first eNode B using the first RE pair and the second RE pair; and measuring a plurality of interference strengths based on a plurality of the CSI-RSs and the received downlink signal, wherein the first RE pair is muted and the second RE pair is an allocated PDSCH (physical downlink shared channel) of the first eNode B when the first RE pair and the second RE pair are configured by an identical antenna port. ### Claim 2 (depends on 1) The method of claim 1, wherein if interference strengths are measured based on the first RE pair, the interference strengths indicate strengths of an interference signal under an environment of no interference from the first eNode B. ### Claim 3 (depends on 1) The method of claim 1, wherein each of a plurality of the RE pairs occupies a position identical to a position of a corresponding CSI-RS on a frequency-time resource. ### Claim 4 (depends on 1) The method of claim 1, the method further comprising: calculating a plurality of CQIs (channel quality indicators) based on the measured plurality of interference strengths. ### Claim 5 (depends on 4) The method of claim 4, the method further comprising: reporting a calculated plurality of CQIs to the second eNode B. ### Claim 6 A user equipment device measuring strength of an interference signal from a first eNode B in a CoMP (coordinated multipoint) environment, the user equipment device comprising: a wireless communication module configured to transceive a signal with eNode Bs; and a processor configured to access the wireless communication module and control an operation of the user equipment device, wherein the processor is further configured to receive a plurality of CSI-RSs (channel status information-reference signals) from a second eNode B via the wireless communication module using a first resource element (RE) pair and a second RE pair, receive a downlink signal from the first eNode B via the wireless communication module using the first RE pair and the second RE pair, and measure a plurality of interference strengths based on a plurality of the CSI-RSs and the received downlink signal, and wherein the first RE pair is muted and the second RE pair is an allocated PDSCH (physical downlink shared channel) of the first eNode B when the first RE pair and the second RE pair are configured by an identical antenna port. ### Claim 7 (depends on 6) The user equipment device of claim 6, wherein if interference strengths are measured based on the first RE pair, the interference strengths indicate strengths of an interference signal under an environment of no interference from the first eNode B. ### Claim 8 (depends on 6) The user equipment device of claim 6, wherein each of a plurality of the RE pairs occupies a position identical to a position of a corresponding CSI-RS on a frequency-time resource. ### Claim 9 (depends on 6) The user equipment device of claim 6, wherein the processor is further configured to calculate a plurality of CQIs (channel quality indicators) based on the measured plurality of interference strengths. ### Claim 10 (depends on 9) The user equipment device of claim 9, wherein the processor is further configured to report the calculated plurality of CQIs to the second eNode B.