# US 11,444,678 B2 · Method for indicating beam failure recovery, device, 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 11,444,678 B2 - Document ID: US11444678B2 - Status: Granted - Kind: B2 - Application number: 17/146,953 - Filed: 2021-01-12 - Published: 2021-05-06 - Granted: 2022-09-13 - Earliest claimed: 2018-07-13 - Assignees: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Applicants: Guangdong Oppo Mobile Telecommunications Corp., Ltd. - Inventors: Xin You; Cong Shi - Web page: https://patentgrep.com/patent/US11444678B2 ## CPC - H04W 74/08: Non-scheduled access, e.g. ALOHA (hybrid access H04W74/02) - H04W 76/19: Connection re-establishment - 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) ## Abstract Disclosed by the present application is a method for indicating beam failure recovery, comprising: when conditions for triggering beam failure recovery are met, a terminal device sending a media access control (MAC) control element (CE), the MAC CE indicating a beam index corresponding to a beam used by a network device to send a feedback message. Further disclosed by the present application are another method for indicating beam failure recovery, a terminal device, a network device, and a non-transitory computer readable storage medium. ## Claims ### Claim 1 A method for indicating beam failure recovery BFR, comprising: when a condition for triggering BFR is met, sending, by a terminal device, a media access control MAC control element CE, the MAC CE indicating a beam index corresponding to a beam used for sending a feedback message by a network device; and receiving, by the terminal device, the feedback message, the feedback message being sent by a network device based on the beam corresponding to the beam index indicated by the MAC CE, wherein the method further comprises determining, by the terminal device, whether the BFR is successful based on the feedback message, further including: determining, by the terminal device, that the BFR is successful when downlink scheduling information sent by the network device is received, wherein the downlink scheduling information is sent by the network device based on a physical downlink control channel PDCCH scrambled by a cell-radio network temporary identity C-RNTI, and wherein before sending, by the terminal device, the MAC CE, the method further comprises: determining, by the terminal device, a downlink beam that meets a threshold condition; and taking the downlink beam that meets the threshold condition as the beam corresponding to the beam index indicated by the MAC CE, wherein the beam index is indicated by a single side band SSB index. ### Claim 2 (depends on 1) The method according to claim 1, wherein the determining, by the terminal device, whether the BFR is successful based on the feedback further message comprises: determining, by the terminal device, that the BFR fails when the downlink scheduling information sent by the network device is not received. ### Claim 3 (depends on 1) The method according to claim 1, wherein: resources used by the terminal device to send the MAC CE are configured based on dynamic scheduling or by using semi-static resources. ### Claim 4 (depends on 1) A non-transitory computer readable storage medium storing an executable program that, when executed by a processor, implements the method for indicating beam failure recovery according to claim 1. ### Claim 5 A method for indicating beam failure recovery BFR, comprising: sending, by a network device a single side band SSB index, to a terminal device; receiving, by the network device, a media access control MAC control element CE sent by the terminal device; and sending, by the network device, a feedback message to the terminal device based on a beam corresponding to a beam index indicated by the MAC CE; wherein the feedback message is used for determining whether the BFR is successful by the terminal device, wherein the method further comprises sending, by the network, downlink scheduling information based on a physical downlink control channel PDCCH scrambled by a cell-radio network temporary identity C-RNTI, and the downlink scheduling information is used by the terminal device for determining that the BFR is successful when the downlink scheduling information is received, and wherein the SSB index is used to indicate the beam index, and the beam index is used by the terminal device to determine a downlink beam that meets a threshold condition, and take the downlink beam that meets the threshold condition as the beam corresponding to the beam index indicated by the MAC CE. ### Claim 6 (depends on 5) A non-transitory computer readable storage medium storing an executable program that, when executed by a processor, implements the method for indicating beam failure recovery according to claim 5. ### Claim 7 (depends on 5) A network device, comprising: a processor and a memory for storing a computer program that is capable of running on the processor, wherein: when the processor is configured to execute steps of the method for indicating beam failure recovery according to claim 5, when running the computer program. ### Claim 8 A terminal device, comprising: a processor, a transceiver, and a memory for storing a computer program that is capable of running on the processor, wherein: the transceiver is configured to send a media access control MAC control element CE when a condition for triggering beam failure recovery BFR is met, the MAC CE indicating a beam index corresponding to a beam used for sending a feedback message by a network device, and the transceiver is further configured to receive the feedback message, the feedback message being sent by the network device based on the beam corresponding to the beam index indicated by the MAC CE, wherein the processor is configured to: determine whether the BFR is successful based on the feedback message, determine that the BFR is successful when downlink scheduling information sent by the network device is received, wherein the downlink scheduling information is sent by the network device based on a physical downlink control channel PDCCH scrambled by a cell-radio network temporary identity C-RNTI, and determine, before sending the MAC CE, a downlink beam that meets a threshold condition, and take the downlink beam that meets the threshold condition as the beam corresponding to the beam index indicated by the MAC CE, wherein the beam index is indicated by a single side band SSB index. ### Claim 9 (depends on 8) The terminal device according to claim 8, wherein the processor is further configured to: determine that the BFR fails when the transceiver does not receive the downlink scheduling information sent by the network device. ### Claim 10 (depends on 8) The terminal device according to claim 8, wherein resources used by the terminal device to send the MAC CE are configured based on dynamic scheduling or by using semi-static resources.