# US 9,521,567 B2 · Method for performing measurement of terminal in wireless communication system and apparatus therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,521,567 B2 - Document ID: US9521567B2 - Status: Granted - Kind: B2 - Application number: 14/412,557 - Filed: 2013-07-11 - Published: 2015-06-11 - Granted: 2016-12-13 - Earliest claimed: 2012-07-11 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Seungmin Lee; Hakseong Kim; Hanbyul Seo; Kijun Kim; Inkwon Seo - Web page: https://patentgrep.com/patent/US9521567B2 ## CPC - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - 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 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 88/02: Terminal devices - 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 The present invention relates to a method for enabling a terminal to perform a measurement in a wireless communication system. More specifically, the present invention comprises the steps of: receiving information related to a specific cell group as a measuring target; determining a representative value by performing the measurement for the specific cell group according to the received information; and performing radio resource management or radio link monitoring on the basis of the representative value, wherein the specific cell group is configured to enable a virtual cell identifier to comprise a plurality of equally set cells. ## Claims ### Claim 1 A method for performing a measurement by a User Equipment (UE) in a wireless communication system, the method comprising: receiving information about a specific cell group to be measured, wherein the received information includes at least one of a list of physical cell identifiers (IDs) of a plurality of cells included in the specific cell group and a virtual cell ID for the specific cell group; determining a representative value by measuring the specific cell group according to the received information; and when the received information includes the virtual cell ID, performing Radio Resource Management (RRM) or Radio Link Monitoring (RLM) based on the representative value, wherein the RRM is set to be performed based on a measurement result of the specific cell group being larger than a measurement result of a cell group having a cell ID different than the virtual cell ID. ### Claim 2 (depends on 1) The method according to claim 1, wherein the representative value is determined according to communication state indication values measured from the plurality of cells. ### Claim 3 (depends on 2) The method according to claim 2, wherein each of the communication state indication values is one of a Reference Signal Received Power (RSRP), a Reference Signal Received Quality (RSRQ), a Block Error Rate (BLER) of joint decoding of a Physical Downlink Control Channel (PDCCH) and a Physical Control Format Indicator Channel (PCFICH), an Enhanced PDCCH (EPDCCH)-based RLM measurement value, and a BLER based on decoding performance of an EPDCCH and a PDCCH. ### Claim 4 (depends on 1) The method according to claim 1, wherein the measurement is performed using at least one Reference Signal (RS) transmitted at a same time point by the plurality of cells included in the specific cell group. ### Claim 5 (depends on 1) The method according to claim 1, wherein the measurement is performed based on a Reference Signal (RS) transmission resource area or an RS transmission antenna port, independently configured for each of the plurality of cells included in the specific cell group. ### Claim 6 (depends on 1) The method according to claim 1, wherein the RLM is set to be performed based on an Enhanced Physical Downlink Control Channel (EPDCCH). ### Claim 7 (depends on 1) The method according to claim 1, wherein the RRM is reported only about the cell group having the cell ID different than the virtual cell ID. ### Claim 8 (depends on 1) The method according to claim 1, wherein the RRM is set to be reported about each of the plurality of cells of the specific cell group. ### Claim 9 (depends on 1) The method according to claim 1, further comprising attempting initial access based on an Enhanced Physical Downlink Control Channel (EPDCCH). ### Claim 10 (depends on 9) The method according to claim 9, wherein if the UE is in connected mode, the RRM is performed for the plurality of cells to which a same virtual cell ID is assigned. ### Claim 11 (depends on 1) The method according to claim 1, wherein the RLM is set to be performed based on at least one of an RLM measurement value of a serving base station (BS) of the UE and the representative value. ### Claim 12 (depends on 1) The method according to claim 1, wherein a Timing Advance (TA) value is set for the UE with respect to a specific cell included in the specific cell group. ### Claim 13 A User Equipment (UE) for performing a measurement in a wireless communication system, the UE comprising: a Radio Frequency (RF) unit; and a processor, wherein the processor is configured to: receive, via the RF unit, information about a specific cell group to be measured, wherein the received information includes at least one of a list of physical cell identifiers (IDs) of a plurality of cells included in the specific cell group and a virtual cell ID for the specific cell group, determine a representative value by measuring the specific cell group according to the received information, and when the received information includes the virtual cell ID, perform Radio Resource Management (RRM) or Radio Link Monitoring (RLM) based on the representative value, wherein the RRM is set to be performed based on a measurement result of the specific cell group being larger than a measurement result of a cell group having a cell ID different than the virtual cell ID.