# US 12,191,969 B2 · Device/UE-oriented beam recovery and maintenance mechanisms > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,191,969 B2 - Document ID: US12191969B2 - Status: Granted - Kind: B2 - Application number: 17/453,757 - Filed: 2021-11-05 - Published: 2022-02-24 - Granted: 2025-01-07 - Earliest claimed: 2017-01-05 - Assignees: Futurewei Technologies, Inc. - Applicants: Futurewei Technologies, Inc. - Inventors: Pengfei Xia; Bin Liu; Nathan Edward Tenny - Web page: https://patentgrep.com/patent/US12191969B2 ## CPC - H04B 7/0834: {based on external parameters, e.g. subscriber speed or location} - H04B 7/061: {using feedback from receiving side} - H04B 7/06964: {Re-selection of one or more beams after beam failure} - H04B 7/088: {using beam selection} - H04W 72/21: in the uplink direction of a wireless link, i.e. towards the network - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04B: TRANSMISSION - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract Aspects of this disclosure provide techniques for detecting and recovering from beam-failure events. In some embodiments, motion sensor information generated by motion sensors on a UE is used to detect, predict, and/or recover from a beam failure event that results, or would otherwise result, from movement of the UE. The motion sensor information may be used to adjust a current beam direction used by the UE to transmit or receive a signal, or to determine a recommendation for adjusting a current beam direction of the base station. The motion sensor information may be generated by any sensor that detects a movement of the UE, such as a gyroscope, an accelerometer, a magnetometer, a global positioning system (GPS) sensor, a global navigation satellite system (GNSS) sensor, or any other device that detects a change in position/orientation of the UE. ## Claims ### Claim 1 A method comprising: determining, by a user equipment (UE), a quality of one or more downlink reference signals from a base station; detecting, by the UE, a beam failure event associated with one or more beams based on the quality of the one or more downlink signals; and transmitting, by the UE, a media access control (MAC) control element (CE) transmission for beam failure recovery responsive to the beam failure event, wherein the MAC CE transmission includes an index associated with a resource that carries a signal indicating a new beam direction suitable for transmissions to the UE, the index being different from a beam index the index indicating a time-frequency resource that carries the signal. ### Claim 2 (depends on 1) The method of claim 1, wherein the one or more downlink signals is received over a first carrier frequency, and wherein the MAC CE transmission are transmitted over a second carrier frequency different from the first carrier frequency. ### Claim 3 (depends on 1) The method of claim 1, the detecting comprising: detecting, by the UE, the beam failure event associated with the one or more beams based on a number of downlink reference signal measurements failing to exceed a threshold during a time-out period. ### Claim 4 (depends on 3) The method of claim 3, the downlink reference signal measurements including signal qualities of the one or more downlink signals or power levels of the one or more downlink reference signals. ### Claim 5 (depends on 1) The method of claim 1, wherein the MAC CE transmission indicates a recommendation to initiate a beam management procedure. ### Claim 6 (depends on 1) The method of claim 1, wherein the index included in the MAC CE transmission indirectly indicates the new beam direction. ### Claim 7 (depends on 1) The method of claim 1, wherein the index included in the MAC CE transmission is associated with the time-frequency resource that carries a reference signal. ### Claim 8 A user equipment (UE) comprising: at least one processor; and a non-transitory computer readable storage medium storing programming for execution by the at least one processor, the programming including instructions to cause the UE to: determine a quality of one or more downlink signals from a base station; detect a beam failure event associated with one or more beams based on the quality of the one or more downlink signals; and transmit a media access control (MAC) control element (CE) transmission for beam failure recovery responsive to the beam failure event, wherein the MAC CE transmission includes an index associated with a resource that carries a signal indicating a new beam direction suitable for transmissions to the UE, the index being different from a beam index the index indicating a time-frequency resource that carries the signal. ### Claim 9 (depends on 8) The UE of claim 8, wherein the one or more downlink signals is received over a first carrier frequency, and wherein the MAC CE transmission are transmitted over a second carrier frequency different from the first carrier frequency. ### Claim 10 (depends on 8) The UE of claim 8, the instructions to cause the UE to detect the beam failure event include instructions to: detect the beam failure event associated with the one or more beams based on a number of downlink reference signal measurements failing to exceed a threshold during a time-out period. ### Claim 11 (depends on 10) The UE of claim 10, the downlink reference signal measurements including signal qualities of the one or more downlink signals or power levels of the one or more downlink reference signals. ### Claim 12 (depends on 8) The UE of claim 8, wherein the MAC CE transmission indicates a recommendation to initiate a beam management procedure. ### Claim 13 A method comprising: transmitting, by a base station to a user equipment (UE), one or more downlink signals; and receiving, by the base station from the UE, a media access control (MAC) control element (CE) transmission for beam failure recovery responsive to a beam failure event associated with one or more beams detected by the UE based on a quality of the one or more downlink signals, wherein the MAC CE transmission includes an index associated with a resource that carries a signal indicating a new beam direction suitable for transmissions to the UE, the index being different from a beam index the index indicating a time-frequency resource that carries the signal. ### Claim 14 (depends on 13) The method of claim 13, wherein the one or more downlink signals is transmitted over a first carrier frequency, and wherein the MAC CE transmission are received over a second carrier frequency different from the first carrier frequency. ### Claim 15 (depends on 13) The method of claim 13, wherein the beam failure event is based on a number of downlink reference signal measurements failing to exceed a threshold during a time-out period. ### Claim 16 (depends on 15) The method of claim 15, the downlink reference signal measurements including signal qualities of the one or more downlink signals or power levels of the one or more downlink reference signals. ### Claim 17 (depends on 13) The method of claim 13, the method further comprising: communicating, by the base station with the UE, according to the new beam direction. ### Claim 18 (depends on 13) The method of claim 13, wherein the MAC CE transmission indicates a recommendation to initiate a beam management procedure, the method further comprising: initiating, by the base station, the beam management procedure. ### Claim 19 A base station comprising: at least one processor; and a non-transitory computer readable storage medium storing programming for execution by the at least one processor, the programming including instructions to cause the base station to: transmit, a user equipment (UE), one or more downlink reference signals; and receive, from the UE, a media access control (MAC) control element (CE) transmission for beam failure recovery responsive to a beam failure event associated with one or more beams detected by the UE based on a quality of the one or more downlink signals, wherein the MAC CE transmission includes an index associated with a resource that carries a signal indicating a new beam direction suitable for transmissions to the UE, the index being different from a beam index the index indicating a time-frequency resource that carries the signal. ### Claim 20 (depends on 19) The base station of claim 19, wherein the one or more downlink signals is transmitted over a first carrier frequency, and wherein the MAC CE transmission are received over a second carrier frequency different from the first carrier frequency. ### Claim 21 (depends on 19) The base station of claim 19, wherein the beam failure event is based on a number of downlink reference signal measurements failing to exceed a threshold during a time-out period. ### Claim 22 (depends on 21) The base station of claim 21, the downlink reference signal measurements including signal qualities of the one or more downlink signals or power levels of the one or more downlink reference signals. ### Claim 23 (depends on 19) The base station of claim 19, the programming further including instructions to cause the base station to: communicate, with the UE, according to the new beam direction. ### Claim 24 (depends on 19) The base station of claim 19, wherein the MAC CE transmission indicates a recommendation to initiate a beam management procedure, the programming further including instructions to cause the base station to: initiate the beam management procedure.