# US 12,120,722 B2 · Method for radio link monitoring, terminal, base station, and storage medium > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,120,722 B2 - Document ID: US12120722B2 - Status: Granted - Kind: B2 - Application number: 17/490,952 - Filed: 2021-09-30 - Published: 2022-01-20 - Granted: 2024-10-15 - Earliest claimed: 2019-04-02 - Assignees: Vivo Mobile Communication Co., Ltd. - Applicants: Vivo Mobile Communication Co., Ltd. - Inventors: Zichao Ji; Xueming Pan; Huaming Wu - Web page: https://patentgrep.com/patent/US12120722B2 ## CPC - H04W 72/542: using measured or perceived quality - H04B 17/309: Measuring or estimating channel quality parameters - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 72/02: Selection of wireless resources by user or terminal - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W 92/18: between terminal devices - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION ## Abstract A method for radio link monitoring, a terminal, a base station, and a storage medium are provided. The method for radio link monitoring includes: in sidelink communication, performing a radio link monitoring RLM measurement on a radio link between terminals to monitor radio link quality between the terminals, where if a terminal is configured with a plurality of resource pools, the RLM measurement is performed in each resource pool, or if a terminal is configured with a plurality of beams or a plurality of antenna panels, the RLM measurement is performed on each beam or each antenna panel. With the embodiments of this application, radio link quality in sidelink communication can be monitored. ## Claims ### Claim 1 A method for radio link monitoring, wherein the method comprises: in sidelink communication, performing, by a first terminal, a radio link monitoring (RLM) measurement on a radio link between terminals comprising the first terminal and a second terminal to monitor radio link quality between the terminals, wherein the RLM measurement is performed in each resource pool in a case that the first terminal is configured with a plurality of resource pools; or, the RLM measurement is performed on each beam or each antenna panel in a case that the first terminal is configured with a plurality of beams or a plurality of antenna panels; wherein the performing RLM measurement comprises: performing the RLM measurement based on: the number of pieces of valid sidelink control information (SCI) or the number of physical sidelink control channels (PSCCHs) transmitted by the second terminal per unit time. ### Claim 2 (depends on 1) The method according to claim 1, wherein the first terminal is configured with a plurality of resource pools, and link quality is determined to be poor in a case that at least one of the following criteria is met: link quality of the plurality of resource pools is poor; link quality of a specified resource pool is poor; and link quality of any one of the resource pools is poor. ### Claim 3 (depends on 1) The method according to claim 1, wherein the first terminal is configured with a plurality of resource pools, and link quality is determined recovered in a case that at least one of the following criteria is met: link quality of any one of the resource pools has become better; link quality of a specified resource pool has become better; and link quality of a plurality of resource pools has become better. ### Claim 4 (depends on 2) The method according to claim 2, wherein the specified resource pool comprises at least one of the following: a resource pool for transmission of specified service; a resource pool for transmission to a specified destination address; a resource pool on a specified carrier or a specified frequency; a resource pool for a specified transmission type; a resource pool associated with a specified feature; and a resource pool for transmission of a specified special channel. ### Claim 5 (depends on 1) The method according to claim 1, wherein the first terminal is configured with a plurality of beams or a plurality of antenna panels, and link quality is determined to be poor in a case that at least one of the following criteria is met: link quality of a plurality of beams or the plurality of antenna panels is poor; link quality of a specified beam or a specified antenna panel is poor; and link quality of any one of the beams or any one of the antenna panels is poor. ### Claim 6 (depends on 1) The method according to claim 1, wherein the first terminal is configured with a plurality of beams or a plurality of antenna panels, and link quality is determined recovered in a case that at least one of the following criteria is met: link quality of any one of the beams or any one of the antenna panels has become better; link quality of a specified beam or a specified antenna panel has become better; and link quality of a plurality of beams or the plurality of antenna panels has become better. ### Claim 7 A terminal, wherein the terminal is a first terminal and the terminal comprises a processor, a memory, and a computer program stored in the memory and capable of running on the processor, and the computer program, when executed by the processor, implements: in sidelink communication, performing a radio link monitoring (RLM) measurement on a radio link between terminals comprising the first terminal and a second terminal to monitor radio link quality between the terminals, wherein the RLM measurement is performed in each resource pool in a case that the first terminal is configured with a plurality of resource pools; or, the RLM measurement is performed on each beam or each antenna panel in a case that the first terminal is configured with a plurality of beams or a plurality of antenna panels; wherein the performing RLM measurement comprises: performing the RLM measurement based on: the number of pieces of valid sidelink control information (SCI) or the number of physical sidelink control channels (PSCCHs) transmitted by the second terminal per unit time. ### Claim 8 (depends on 7) The terminal according to claim 7, wherein the first terminal is configured with a plurality of resource pools, and link quality is determined to be poor in a case that at least one of the following criteria is met: link quality of the plurality of resource pools is poor; link quality of a specified resource pool is poor; and link quality of any one of the resource pools is poor. ### Claim 9 (depends on 7) The terminal according to claim 7, wherein the first terminal is configured with a plurality of resource pools, and link quality is determined recovered in a case that at least one of the following criteria is met: link quality of any one of the resource pools has become better; link quality of a specified resource pool has become better; and link quality of a plurality of resource pools has become better. ### Claim 10 (depends on 8) The terminal according to claim 8, wherein the specified resource pool comprises at least one of the following: a resource pool for transmission of specified service; a resource pool for transmission to a specified destination address; a resource pool on a specified carrier or a specified frequency; a resource pool for a specified transmission type; a resource pool associated with a specified feature; and a resource pool for transmission of a specified special channel. ### Claim 11 (depends on 7) The terminal according to claim 7, wherein the first terminal is configured with a plurality of beams or a plurality of antenna panels, and link quality is determined to be poor in a case that at least one of the following criteria is met: link quality of a plurality of beams or the plurality of antenna panels is poor; link quality of a specified beam or a specified antenna panel is poor; and link quality of any one of the beams or any one of the antenna panels is poor. ### Claim 12 (depends on 7) The terminal according to claim 7, wherein the first terminal is configured with a plurality of beams or a plurality of antenna panels, and link quality is determined recovered in a case that at least one of the following criteria is met: link quality of any one of the beams or any one of the antenna panels has become better; link quality of a specified beam or a specified antenna panel has become better; and link quality of a plurality of beams or the plurality of antenna panels has become better. ### Claim 13 A non-transitory computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, the computer program, when executed by the processor, implements: in sidelink communication, performing a radio link monitoring (RLM) measurement on a radio link between terminals comprising a first terminal and a second terminal to monitor radio link quality between the terminals, wherein the RLM measurement is performed in each resource pool in a case that the first terminal is configured with a plurality of resource pools; or, the RLM measurement is performed on each beam or each antenna panel in a case that the first terminal is configured with a plurality of beams or a plurality of antenna panels; wherein the performing RLM measurement comprises: performing the RLM measurement based on: the number of pieces of valid sidelink control information (SCI) or the number of physical sidelink control channels (PSCCHs) transmitted by the second terminal per unit time. ### Claim 14 (depends on 13) The storage medium according to claim 13, wherein the first terminal is configured with a plurality of resource pools, and link quality is determined to be poor in a case that at least one of the following criteria is met: link quality of the plurality of resource pools is poor; link quality of a specified resource pool is poor; and link quality of any one of the resource pools is poor. ### Claim 15 (depends on 13) The storage medium according to claim 13, wherein the first terminal is configured with a plurality of resource pools, and link quality is determined recovered in a case that at least one of the following criteria is met: link quality of any one of the resource pools has become better; link quality of a specified resource pool has become better; and link quality of a plurality of resource pools has become better. ### Claim 16 (depends on 14) The storage medium according to claim 14, wherein the specified resource pool comprises at least one of the following: a resource pool for transmission of specified service; a resource pool for transmission to a specified destination address; a resource pool on a specified carrier or a specified frequency; a resource pool for a specified transmission type; a resource pool associated with a specified feature; and a resource pool for transmission of a specified special channel. ### Claim 17 (depends on 13) The storage medium according to claim 13, wherein the first terminal is configured with a plurality of beams or a plurality of antenna panels, and link quality is determined to be poor in a case that at least one of the following criteria is met: link quality of a plurality of beams or the plurality of antenna panels is poor; link quality of a specified beam or a specified antenna panel is poor; and link quality of any one of the beams or any one of the antenna panels is poor. ### Claim 18 (depends on 13) The storage medium according to claim 13, wherein the first terminal is configured with a plurality of beams or a plurality of antenna panels, and link quality is determined recovered in a case that at least one of the following criteria is met: link quality of any one of the beams or any one of the antenna panels has become better; link quality of a specified beam or a specified antenna panel has become better; and link quality of a plurality of beams or the plurality of antenna panels has become better. ### Claim 19 (depends on 1) The method according to claim 1, further comprising: reporting a first reporting indication for indicating a good radio link quality if a count that the number of pieces of valid SCI or the number of PSCCHs is greater than a first threshold reaches a first preset count; or reporting a second reporting indication for indicating a poor radio link quality if a count that the number of pieces of valid SCI or the number of PSCCHs is less than a second threshold reaches a second preset count. ### Claim 20 (depends on 1) The method according to claim 1, wherein the method comprises: counting the number of pieces of the valid SCI or the number of PSCCHs transmitted by the second terminal per unit time; and performing one of: determining the radio link quality to be good in a case that the counted number of pieces of valid SCI or the counted number of PSCCHs is greater than a first threshold; and determining the radio link quality to be poor in a case that the counted number of pieces of valid SCI or the counted number of PSCCHs is less than a second threshold; wherein the first threshold is greater than the second threshold.