# US 10,873,866 B2 · Method for managing radio resources in communication system and apparatus for the same > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,873,866 B2 - Document ID: US10873866B2 - Status: Granted - Kind: B2 - Application number: 16/131,222 - Filed: 2018-09-14 - Published: 2019-03-28 - Granted: 2020-12-22 - Earliest claimed: 2017-09-27 - Assignees: Electronics and Telecommunications Research Institute - Applicants: Electronics and Telecommunications Research Institute - Inventors: Jae Heung Kim - Web page: https://patentgrep.com/patent/US10873866B2 ## CPC - H04W 24/04: Arrangements for maintaining operational condition - H04B 7/0404: the mobile station comprising multiple antennas, e.g. to provide uplink diversity - H04B 7/0617: {for beam forming} - H04B 7/06964: {Re-selection of one or more beams after beam failure} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 56/001: {Synchronization between nodes} - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 76/28: Discontinuous transmission [DTX]; Discontinuous reception [DRX] - 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 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals} - H04W 80/02: Data link layer protocols - 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 A beam management method, performed by a terminal in a communication system, includes receiving a control message including at least one parameter used for beam management from a first base station; performing a monitoring operation on a first beam configured between the first base station and the terminal based on the at least one parameter; detecting a beam problem in the first beam based on the monitoring operation; and in response to determination that the beam problem is detected in the first beam, performing a recovery operation on the first beam. ## Claims ### Claim 1 An operation method performed by a terminal in a communication system, the operation method comprising: configuring one or more cells with a base station; performing a measurement operation for one or more candidate beams of a first cell among the one or more cells; generating a medium access control (MAC) control element (CE) including an indication information of the first cell and an indication information of at least one candidate beam which is selected based on results of the measurement operation among the one or more candidate beams; and transmitting the MAC CE to the base station, wherein the one or more candidate beams are configured by the base station, and the MAC CE is used for beam failure recovery (BFR). ### Claim 2 (depends on 1) The operation method according to claim 1, wherein the MAC CE further includes measurement information of the one or more candidate beams. ### Claim 3 (depends on 1) The operation method according to claim 1, wherein, when the first cell is a secondary cell of the base station, the MAC CE for the secondary cell is transmitted in a primary cell among the one or more cells of the base station. ### Claim 4 (depends on 3) The operation method according to claim 3, wherein the MAC CE indicates to inactive the secondary cell. ### Claim 5 (depends on 1) The operation method according to claim 1, wherein resource information of a random access (RA) procedure for the BFR is received from the base station. ### Claim 6 (depends on 5) The operation method according to claim 5, wherein the resource information includes at least one of a RA preamble index, masking information, a preamble format of a physical random access channel (PRACH), and time-frequency resources of the PRACH. ### Claim 7 (depends on 5) The operation method according to claim 5, further comprising: when beam failure is detected in the first cell and the first cell is a primary cell of the base station, performing the RA procedure in the primary cell, wherein the RA procedure is a contention-based RA procedure or a non-contention-based RA procedure. ### Claim 8 (depends on 7) The operation method according to claim 7, wherein: when a reference signal received power (RSRP) in the primary cell is greater than or equal to a threshold, the non-contention-based RA procedure is performed, and when the RSRP in the primary cell is lower than the threshold, the contention-based RA procedure is performed. ### Claim 9 (depends on 7) The operation method according to claim 7, wherein: the non-contention-based RA procedure is performed in a time period corresponding a timer, and when the non-contention-based RA procedure is not completed in the time period, the contention-based RA procedure is performed after the time period.