# US 12,192,047 B2 · User equipment, base station and methods in a radio communications network > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,192,047 B2 - Document ID: US12192047B2 - Status: Granted - Kind: B2 - Application number: 18/537,028 - Filed: 2023-12-12 - Published: 2024-06-20 - Granted: 2025-01-07 - Earliest claimed: 2017-05-05 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Icaro L. J. Da Silva; Claes Tidestav - Web page: https://patentgrep.com/patent/US12192047B2 ## CPC - H04L 41/0654: using network fault recovery (ring fault isolation or reconfiguration in loop networks without recovery actions by a network management system H04L12/437) - H04B 7/0617: {for beam forming} - H04B 7/0619: {using feedback from receiving side (feedback signaling for adaptive modulation/coding H04L1/0001)} - H04B 7/06964: {Re-selection of one or more beams after beam failure} - 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 7/0008: {Synchronisation information channels, e.g. clock distribution lines} - H04L 43/16: Threshold monitoring - H04L 69/28: Timers or timing mechanisms used in protocols - H04B 7/0413: MIMO systems - H04B 7/088: {using beam selection} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - H04B: TRANSMISSION ## Abstract According to a first aspect of embodiments herein, the object is achieved by a method performed by a User Equipment (UE) for monitoring a beam transmitted by a base station in a radio communications network. The base station is serving the UE. The UE monitors a reference signal related to the beam, from the base station. Each time a quality of the reference signal is below a first threshold, the UE generates an Out-Of-Synchronization (OOS) event. When the number of OOS events reaches an OOS Beam Failure Detection (BFD) threshold, the UE triggers a beam recovery preparation procedure, and when the number of OOS events reaches an OOS Radio Link Monitoring (RLM), threshold, the UE starts an RLF timer. ## Claims ### Claim 1 A user equipment (UE) having a client application stored in a computer-readable storage medium, the client application being associated with an over-the-top (OTT) service and executable on the UE to transmit user data to a host application associated with the OTT service via a wireless communication network, the client application being operable to initiate transmission of the user data to or from the host application by processing circuitry and transceiver circuitry of the UE, the UE being configured to: monitor a reference signal related to a beam transmitted by a base station serving the UE; generate an Out-Of-Synchronization (OOS) event each time a quality of the reference signal is below a first threshold; trigger a beam recovery preparation procedure when the number of OOS events reaches an OOS Beam Failure Detection (BFD) threshold, the OOS BFD threshold being lower than an OOS Radio Link Monitoring (RLM) threshold used by the UE for starting a radio link failure (RLF) timer; and receive or transmit user data. ### Claim 2 (depends on 1) The UE of claim 1, the UE further configured to: receive, from the base station, a configuration comprising at least one reference signal related to the beam, which reference signal is to be monitored by the UE for BFD and cell-level RLM. ### Claim 3 (depends on 1) The UE of claim 1, the UE further configured to: each time a quality of the reference signal is above a second threshold, generate an In-Synchronization (IS) event. ### Claim 4 (depends on 3) The UE of claim 3, wherein: triggering the beam recovery preparation procedure is performed when furthermore, a number of IS events is below an IS BFD threshold. ### Claim 5 A host computer configured to operate in a communication system to provide an over-the-top (OTT) service, the host computer comprising: processing circuitry configured to initiate transmissions to receive or provide user data associated with the OTT service; and a network interface configured to facilitate reception or transmission of the user data from a user equipment (UE) via a network node in a cellular network, the network node having a communication interface and processing circuitry, the processing circuitry of the network node configured to perform operations comprising: configuring a UE to monitor a reference signal related to a beam transmitted by the network node; configuring the UE with an OOS Beam Failure Detection (BFD) threshold to be used by the UE to trigger a beam recovery preparation procedure when a number of out-of-synchronization (OOS) events generated by the UE reaches the OOS BFD threshold, the OOS BFD threshold being lower than an OOS Radio Link Monitoring (RLM) threshold used by the UE for starting a radio link failure (RLF) timer; and continuing transmission of user data based on the beam recovery preparation procedure. ### Claim 6 (depends on 5) The host computer of claim 5, the operations further comprising: configuring the UE with a second threshold to be used by the UE to, each time a quality of the reference signal is above a second threshold, generate an In-Synchronization (IS) event. ### Claim 7 (depends on 6) The host computer of claim 6, the operations further comprising: configuring the UE with an in-sync (IS) BFD threshold to be used by the UE to trigger the beam recovery preparation procedure when, furthermore, a number of IS events is below the IS BFD threshold. ### Claim 8 (depends on 7) The host computer of claim 7, the operations further comprising: configuring the UE with an IS RLM threshold to be used by the UE to start the RLF timer when, furthermore, the number of IS events is below the IS RLM threshold. ### Claim 9 A non-transitory computer-readable storage medium comprising, stored thereupon, a client application associated with a UE operable in a wireless communication network, the client application being executable on the UE to transmit or receive user data to or from a host application associated with a host computer providing an over-the-top (OTT) service via the wireless communication network, the client application comprising instructions configured to cause the UE to: initiate transmission of the user data to or from the host application by processing circuitry and transceiver circuitry of the UE, the UE being configured to: monitor a reference signal related to a beam transmitted by a network node serving the UE; generate an Out-Of-Synchronization (OOS) event each time a quality of the reference signal is below a first threshold; trigger a beam recovery preparation procedure when the number of OOS events reaches an OOS Beam Failure Detection (BFD) threshold, the OOS BFD threshold being lower than an OOS Radio Link Monitoring (RLM) threshold used by the UE for starting a radio link failure (RLF) timer; and receive or transmit user data. ### Claim 10 (depends on 9) The non-transitory computer-readable storage medium of claim 9, wherein the client application further comprises instructions configured to cause the UE to: receive from the network node a configuration comprising at least one reference signal related to the beam, which reference signal is to be monitored by the UE for BFD, and cell-level RLM. ### Claim 11 (depends on 9) The non-transitory computer-readable storage medium of claim 9, wherein the client application further comprises instructions configured to cause the UE to: each time a quality of the reference signal is above a second threshold, generate an In-Synchronization (IS) event. ### Claim 12 (depends on 11) The non-transitory computer-readable storage medium of claim 11, wherein the client application further comprises instructions configured to cause the UE to: trigger the beam recovery preparation procedure when, furthermore, a number of IS events is below an IS BFD threshold. ### Claim 13 (depends on 11) The non-transitory computer-readable storage medium of claim 11, wherein the client application further comprises instructions configured to cause the UE to start the RLF timer when, furthermore, the number of IS events is below an IS RLM threshold. ### Claim 14 A communication system operable to enable provision of an over-the-top (OTT) service, the communication system comprising: a host computer configured to provide the OTT service, the host computer comprising: processing circuitry configured to initiate transmissions to receive or provide user data associated with the OTT service; and a network interface configured to facilitate reception or transmission of the user data from a user equipment (UE) via a network node in a cellular network, the network node having a communication interface and processing circuitry, the processing circuitry of the network node configured to perform operations comprising: configuring a UE to monitor a reference signal related to a beam transmitted by the network node; configuring the UE with an OOS Beam Failure Detection (BFD) threshold to be used by the UE to trigger a beam recovery preparation procedure when a number of out-of-synchronization (OOS) events generated by the UE reaches the OOS BFD threshold, the OOS BFD threshold being lower than an OOS Radio Link Monitoring (RLM) threshold used by the UE for starting a radio link failure (RLF) timer; and continuing transmission of user data based on the beam recovery preparation procedure.