# US 12,603,810 B2 · System and method for communications beam recovery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,603,810 B2 - Document ID: US12603810B2 - Status: Granted - Kind: B2 - Application number: 18/188,565 - Filed: 2023-03-23 - Published: 2023-09-14 - Granted: 2026-04-14 - Earliest claimed: 2017-03-31 - Assignees: Futurewei Technologies, Inc. - Applicants: Futurewei Technologies, Inc. - Inventors: Pengfei Xia; Bin Liu - Web page: https://patentgrep.com/patent/US12603810B2 ## 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 7/06952: {Selecting one or more beams from a plurality of beams, e.g. beam training, management or sweeping} - H04B 7/088: {using beam selection} - H04L 5/0023: {Time-frequency-space} - 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 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information} - H04W 16/28: using beam steering - H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal - H04W 74/006: {in the downlink, i.e. towards the terminal} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 76/27: Transitions between radio resource control [RRC] states - H04W 88/02: Terminal devices - 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 A method for operating an access node includes generating a configuration message including information specifying a set of reference signals of a first reference signal type and a set of reference signals of a second reference signal type used to identify a new beam, and information specifying random access channel resources allocated for transmitting preamble sequences, wherein each random access channel resource is associated with a reference signal of the first reference signal type, sending, to one or more user equipments (UEs), the configuration message, receiving, from a UE, a preamble sequence on one of the random access channel resources, and determining an identity of the UE in accordance with the preamble sequence and the one of the random access channel resources. ## Claims ### Claim 1 A method, comprising: receiving, by a user equipment (UE) from a network device, a beam failure recovery configuration message, the beam failure recovery configuration message indicating synchronization signals for beam failure recovery, the beam failure recovery configuration message indicating reference signals for beam failure recovery, and the beam failure recovery configuration message indicating time-domain or frequency-domain locations of random access channel (RACH) resources for beam failure recovery that are associated with the synchronization signals for beam failure recovery, at least one reference signal of the reference signals for beam failure recovery not being associated with the RACH resources for beam failure recovery; selecting, by the UE, the at least one reference signal of the reference signals for beam failure recovery based on quality measurements of the reference signals for beam failure recovery; and sending, by the UE to the network device, an indication of at least one synchronization signal of the synchronization signals for beam failure recovery over the RACH resources for beam failure recovery, the at least one reference signal for beam failure recovery being quasi-co-located with the at least one synchronization signal for beam failure recovery identified by the indication sent over the RACH resources for beam failure recovery. ### Claim 2 (depends on 1) The method of claim 1, wherein each of the synchronization signals for beam failure recovery is associated with at least one RACH resource of the RACH resources for beam failure recovery. ### Claim 3 (depends on 1) The method of claim 1, wherein the beam failure recovery configuration message further indicates a preamble sequence for the RACH resources for beam failure recovery. ### Claim 4 (depends on 1) The method of claim 1, further comprising: receiving, by the UE from the network device, a radio resource control (RRC) message, the RRC message indicating that the at least one synchronization signal of the synchronization signals for beam failure recovery is quasi-co-located with one of the reference signals for beam failure recovery. ### Claim 5 (depends on 1) The method of claim 1, further comprising: receiving, by the UE from the network device, a beam failure recovery message over a control channel, the beam failure recovery message configuring the UE to perform a beam failure recovery procedure. ### Claim 6 (depends on 5) The method of claim 5, wherein the control channel comprises a physical downlink control channel (PDCCH). ### Claim 7 (depends on 5) The method of claim 5, wherein the control channel is quasi-co-located with the at least one synchronization signal identified by the indication received over the RACH resources for beam failure recovery. ### Claim 8 (depends on 1) The method of claim 1, the quality measurements including reference signal received power (RSRP). ### Claim 9 (depends on 1) The method of claim 1, all of the reference signals for beam failure recovery not associated with the RACH resources for beam failure recovery. ### Claim 10 (depends on 1) The method of claim 1, sending, by the UE to the network device, the indication of the at least one synchronization signal over at least one associated RACH resource of the RACH resources based on associations between the synchronization signals and the RACH resources. ### Claim 11 A user equipment (UE), comprising: at least one processor; and a non-transitory computer readable storage medium storing programming, the programming including instructions that, when executed by the at least one processor, cause the UE to perform operations including: receiving, from a network device, a beam failure recovery configuration message, the beam failure recovery configuration message indicating synchronization signals for beam failure recovery, the beam failure recovery configuration message indicating reference signals for beam failure recovery, and the beam failure recovery configuration message indicating time-domain or frequency-domain locations of random access channel (RACH) resources for beam failure recovery that are associated with the synchronization signals for beam failure recovery, at least one reference signal of the reference signals for beam failure recovery not being associated with the RACH resources for beam failure recovery; selecting the at least one reference signal of the reference signals for beam failure recovery based on quality measurements of the reference signals for beam failure recovery; and sending, to the network device, an indication of at least one synchronization signal of the synchronization signals for beam failure recovery over the RACH resources for beam failure recovery, the at least one reference signal for beam failure recovery being quasi-co-located with the at least one synchronization signal for beam failure recovery identified by the indication sent over the RACH resources for beam failure recovery. ### Claim 12 (depends on 11) The UE of claim 11, wherein each of the synchronization signals for beam failure recovery is associated with at least one RACH resource of the RACH resources for beam failure recovery. ### Claim 13 (depends on 11) The UE of claim 11, wherein the beam failure recovery configuration message further indicates a preamble sequence for the RACH resources for beam failure recovery. ### Claim 14 (depends on 11) The UE of claim 11, the operations further comprising: receiving, from the network device, a radio resource control (RRC) message, the RRC message indicating that the at least one synchronization signal of the synchronization signals for beam failure recovery is quasi-co-located with one of the reference signals for beam failure recovery. ### Claim 15 (depends on 11) The UE of claim 11, the operations further comprising: receiving, from the network device, a beam failure recovery message over a control channel, the beam failure recovery message configuring the UE to perform a beam failure recovery procedure. ### Claim 16 (depends on 15) The UE of claim 15, wherein the control channel comprises a physical downlink control channel (PDCCH). ### Claim 17 (depends on 15) The UE of claim 15, wherein the control channel is quasi-co-located with the at least one synchronization signal identified by the indication received over the RACH resources for beam failure recovery. ### Claim 18 (depends on 11) The UE of claim 11, the quality measurements including reference signal received power (RSRP). ### Claim 19 (depends on 11) The UE of claim 11, all of the reference signals for beam failure recovery not associated with the RACH resources for beam failure recovery. ### Claim 20 A method, comprising: receiving, by a user equipment (UE) from a network device, a beam failure recovery configuration message, the beam failure recovery configuration message indicating synchronization signals for beam failure recovery, the beam failure recovery configuration message indicating reference signals for beam failure recovery, and the beam failure recovery configuration message indicating time-domain or frequency-domain locations of random access channel (RACH) resources for beam failure recovery that are associated with the synchronization signals for beam failure recovery, at least one reference signal of the reference signals for beam failure recovery not being associated with the RACH resources for beam failure recovery; selecting, by the UE, the at least one reference signal of the reference signals for beam failure recovery based on quality measurements of the reference signals for beam failure recovery; sending, by the UE to the network device, an indication of at least one synchronization signal of the synchronization signals for beam failure recovery over the RACH resources for beam failure recovery; and receiving, by the UE from the network device, a beam failure recovery message over a control channel, the beam failure recovery message configuring the UE to perform a beam failure recovery procedure, wherein the control channel is quasi-co-located with the at least one synchronization signal identified by the indication received over the RACH resources for beam failure recovery.