# US 2019/0173740 A1 · Control signaling of beam failure detection > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2019/0173740 A1 - Document ID: US20190173740A1 - Status: Published application - Kind: A1 - Application number: 16/267,721 - Filed: 2019-02-05 - Published: 2019-06-06 - Earliest claimed: 2018-02-06 - Assignees: Intel Corporation - Applicants: Intel Corporation - Inventors: Yushu ZHANG; Guotong WANG; Alexei DAVYDOV; Hong HE; Gang XIONG - Web page: https://patentgrep.com/patent/US20190173740A1 ## CPC - H04L 41/0668: by dynamic selection of recovery network elements, e.g. replacement by the most appropriate element after failure - H04B 7/06964: {Re-selection of one or more beams after beam failure} - H04L 41/0677: Localisation of faults - H04L 41/0894: Policy-based network configuration management - H04L 43/08: Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters - H04L 47/746: {Reaction triggered by a failure} - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04W 36/0058: {Transmission of hand-off measurement information, e.g. measurement reports} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 76/18: Management of setup rejection or failure - H04L 41/0893: Assignment of logical groups to network elements - H04L 43/10: Active monitoring, e.g. heartbeat, ping or trace-route - H04L 43/16: Threshold monitoring - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) - 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 Systems, apparatuses, and methods for control signaling of beam failure detection are disclosed. A beam pair link may be comprised of multiple bandwidth parts (BWPs) or component carriers (CCs). In one embodiment, a beam failure detection reference signal (BFD RS) may be configured, with subsequent BFD RS instances defining a BFD RS periodicity. A BFD periodicity for monitoring the BFD RS may be configured to be less than, or equal or greater than the BFD RS periodicity. A beam failure may be declared if a minimum number of BFD RS instances, either within the BFD periodicity, or nearest the BFD periodicity if no instances fall within the BFD periodicity, fall below a predetermined threshold. The BFD periodicity and BFD RS may be configured for all BWPs/CCs, a subset of BWPs/CCs, or each individual BWP/CC. ## Claims ### Claim 1 An apparatus, comprising: processing circuitry; and control circuitry coupled to the processing circuitry, wherein the control circuitry is to detect, with at least one downlink reference signal (RS), a beam failure instance of a beam in at least one of a plurality of active bandwidth parts (BWPs) or component carriers (CCs) comprising the beam, each of the plurality of active BWPs or CCs associated with at least one downlink RS and an independent beam failure detection (BFD) counter, and the processing circuitry is to cause the beam failure instance to be declared. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the control circuitry is to increment the BFD counter associated with a BWP or CC each time a quality of an RS instance of the at least one RS associated with the BWP or CC falls below a predetermined threshold. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein a first RS instance of the at least one downlink RS and a second RS instance of the at least one downlink RS define a RS periodicity. ### Claim 4 (depends on 3) The apparatus of claim 3, wherein the control circuitry is to detect the beam failure instance based upon the quality of an instance of the at least one downlink RS that falls within a BFD period that is equal to or greater than the RS periodicity. ### Claim 5 (depends on 4) The apparatus of claim 4, wherein the control circuitry is to detect the beam failure instance when the quality of each of a predetermined number of instances of the downlink RS within the BFD period falls below a predetermined threshold. ### Claim 6 (depends on 5) The apparatus of claim 5, wherein the BFD counter associated with the at least one active BWP or CC is incremented each time an instance of the at least one downlink RS falls below the predetermined threshold, and the control circuitry is to detect the beam failure instance when the BFD counter meets or exceeds the predetermined number of instances. ### Claim 7 (depends on 5) The apparatus of claim 5, wherein the predetermined number of downlink RS instances is fixed, is to be configured by signaling from a layer above the MAC or PHY layer, or is determined by a user equipment. ### Claim 8 (depends on 3) The apparatus of claim 3, wherein a beam failure detection (BFD) period is less than the RS periodicity, and the control circuitry is to detect the beam failure instance with the quality of at least a downlink RS instance most recent to the BFD period when no downlink RS instance falls within the BFD period. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein the control circuitry is to initiate a beam failure recovery process on the at least one active BWP or CC upon beam failure instance detection. ### Claim 10 (depends on 1) The apparatus of claim 1, wherein the control circuitry is to maintain an independent beam failure detection process and beam failure recovery process for each of the plurality of active BWPs or CCs. ### Claim 11 (depends on 1) The apparatus of claim 1, wherein the processing circuitry is to declare the beam failure instance when the beam failure instance is detected in all or a subset of the plurality of active BWPs or CCs comprising the beam. ### Claim 12 (depends on 1) The apparatus of claim 1, wherein the apparatus is a user equipment (UE), and the number of downlink RSs or a number of control resource sets (CORESETs) does not exceed a predetermined amount, the amount based upon the UE's capabilities. ### Claim 13 (depends on 12) The apparatus of claim 12, wherein at least one of the number of CORESETs includes a search space set for monitoring a physical downlink control channel (PDCCH) following transmission of a beam failure recovery request, and the at least one of the number of CORESETs may be associated with one of the plurality of active BWPs or CCs. ### Claim 14 One or more non-transitory computer-readable media (CRM) comprising instructions that, when executed by one or more processors, cause the one or more processors to: generate a first and a second beam failure detection (BFD) reference signal (RS); detect an individual beam failure instance based on the quality of either the first or second BFD RS falling below a predetermined threshold; and report the individual beam failure instance; wherein the first and second BFD RSs are associated with one or more active bandwidth parts (BWPs), or component carriers (CCs). ### Claim 15 (depends on 14) The CRM of claim 14, wherein the instructions are to further cause the one or more processors to initiate a beam failure recovery process upon reporting of the beam failure instance. ### Claim 16 (depends on 14) The CRM of claim 14, wherein the first and second BFD RSs define a RS periodicity, the BFD defines a BFD periodicity that is equal to or longer than the RS periodicity, and wherein the instructions are to further cause the one or more processors to detect the individual beam failure instance when the quality of at least one BFD RS within a BFD period falls below the predetermined threshold. ### Claim 17 (depends on 14) The CRM of claim 14, wherein the first and second BFD RSs define a RS periodicity, and wherein the instructions are to further cause the one or more processors to detect, when no BFD RS is within a BFD period, the individual beam failure instance when the quality of a BFD RS most recent to the BFD period falls below the predetermined threshold. ### Claim 18 One or more non-transitory computer-readable media (CRM) comprising instructions that, when executed by one or more processors, cause the one or more processors to: monitor a plurality of configured BWPs/CCs for instances of beam failure; detect one or more individual beam failure instances based on multiple downlink reference signal resources with one or more active bandwidth parts (BWPs) or component carriers (CCs); and generate a report to declare a BFD based on the detection of the one or more individual beam failure instances. ### Claim 19 (depends on 18) The CRM of claim 18, wherein the instructions are to further cause the one or more processors to transmit a plurality of reference signals within a beam failure detection (BFD) period. ### Claim 20 (depends on 19) The CRM of claim 19, wherein the instructions are to further cause the one or more processors to reset a BFD counter when either no beam failure instance is detected within the BFD period, or a user equipment declares a radio link failure. ### Claim 21 (depends on 20) The CRM of claim 20, wherein the instructions are to further cause the one or more processors to maintain a BFD counter and beam failure recovery (BFR) timer for each BWP or CC. ### Claim 22 (depends on 18) The CRM of claim 18, wherein the instructions are to further cause the one or more processors to trigger a physical random access channel (PRACH)-based BFR when a beam failure instance is detected in a plurality of BWPs or CCs. ### Claim 23 An apparatus, comprising: detection means for detecting individual beam failure instances based on multiple downlink reference signal resources with one or more active bandwidth parts (BWPs) or component carriers (CCs); and reporting means for reporting the individual beam failure instances. ### Claim 24 (depends on 23) The apparatus of claim 23, further comprising repair means for initiating a beam failure recovery process upon detection, by the detection means of an individual beam failure instance. ### Claim 25 (depends on 24) The apparatus of claim 24, wherein the detection means is to generate a plurality of beam failure detection reference signals for each of the one or more active BWPs or CCs.