# US 2019/0246308 A1 · Method and apparatus for performing measurement in an extension carrier > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0246308 A1 - Document ID: US20190246308A1 - Status: Published application - Kind: A1 - Application number: 16/385,887 - Filed: 2019-04-16 - Published: 2019-08-08 - Earliest claimed: 2010-02-02 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Soyeon KIM; Sungho MOON; Jaehoon CHUNG; Minseok NOH - Web page: https://patentgrep.com/patent/US20190246308A1 ## CPC - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04L 1/0026: {Transmission of channel quality indication} - H04L 1/0031: {Multiple signaling transmission (H04L1/1664, F15 take precedence)} - H04L 5/001: {the frequencies being arranged in component carriers} - H04W 24/00: Supervisory, monitoring or testing arrangements - H04W 72/0446: Resources in time domain, e.g. slots or frames - H04W 76/27: Transitions between radio resource control [RRC] states - 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 A method of performing a measurement when a mobile terminal is configured with a plurality of component carriers is discussed. The method is performed by the mobile terminal and includes receiving, by the mobile terminal, configuration information from a base station; and performing, by the mobile terminal, the measurement based on the received configuration information. Further, when the received configuration information includes an indication information for the measurement in an extension component carrier among the plurality of component carriers, the measurement in the extension component carrier is based on a channel state information reference signal (CSI-RS), and when the received configuration information does not include the indication information for the measurement in the extension component carrier among the plurality of component carriers, the measurement in the extension component carrier is based on a cell specific reference signal (CRS). ## Claims ### Claim 1 A method of performing a measurement when a mobile terminal is configured with a plurality of component carriers, the method performed by the mobile terminal and comprising: receiving, by the mobile terminal, configuration information from a base station; and performing, by the mobile terminal, the measurement based on the received configuration information, wherein when the received configuration information includes an indication information for the measurement in an extension component carrier among the plurality of component carriers, the measurement in the extension component carrier is based on a channel state information reference signal (CSI-RS), and wherein when the received configuration information does not include the indication information for the measurement in the extension component carrier among the plurality of component carriers, the measurement in the extension component carrier is based on a cell specific reference signal (CRS). ### Claim 2 (depends on 1) The method of claim 1, wherein the configuration information is received once or periodically through a radio resource control (RRC) signaling. ### Claim 3 (depends on 1) The method of claim 1, further comprising: receiving, by the mobile terminal, the CSI-RS and the CRS from the base station. ### Claim 4 (depends on 3) The method of claim 3, wherein at least one of the CRS or the CSI-RS has a reduced reference signal density. ### Claim 5 (depends on 3) The method of claim 3, wherein the CRS has a reduced reference signal density for at least one of first and second antennas. ### Claim 6 (depends on 3) The method of claim 3, wherein the CRS is received on either a first slot or a second slot in a subframe. ### Claim 7 A mobile terminal configured with a plurality of component carriers in a wireless communication system, the mobile terminal comprising: a radio-frequency (RF) module; a processor; and a memory operably connectable to the processor and storing instructions that, when executed, cause the processor to perform operations comprising: receiving configuration information from a base station; and performing the measurement based on the received configuration information, wherein when the received configuration information includes an indication information for the measurement in an extension component carrier among the plurality of component carriers, the measurement in the extension component carrier is based on a channel state information reference signal (CSI-RS), and wherein when the received configuration information does not include the indication information for the measurement in the extension component carrier among the plurality of component carriers, the measurement in the extension component carrier is based on a cell specific reference signal (CRS). ### Claim 8 (depends on 7) The mobile terminal of claim 7, wherein the configuration information is received once or periodically through a radio resource control (RRC) signaling. ### Claim 9 (depends on 7) The mobile terminal of claim 7, wherein the operations further comprise: receiving the CSI-RS and the CRS from the base station. ### Claim 10 (depends on 9) The mobile terminal of claim 9, wherein at least one of the CRS or the CSI-RS has a reduced reference signal density. ### Claim 11 (depends on 9) The mobile terminal of claim 9, wherein the CRS has a reduced reference signal density for at least one of first and second antennas. ### Claim 12 (depends on 9) The mobile terminal of claim 9, wherein the CRS is received on either a first slot or a second slot in a subframe.