# US 12,004,224 B2 · Beam failure recovery > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,004,224 B2 - Document ID: US12004224B2 - Status: Granted - Kind: B2 - Application number: 17/475,727 - Filed: 2021-09-15 - Published: 2023-03-16 - Granted: 2024-06-04 - Earliest claimed: 2021-09-15 - Assignees: Nokia Technologies Oy - Applicants: Nokia Technologies Oy - Inventors: Ali Karimidehkordi; Samantha Caporal del Barrio; Sami-Jukka Hakola; Timo Koskela - Web page: https://patentgrep.com/patent/US12004224B2 ## CPC - H04W 72/046: {the resource being in the space domain, e.g. beams} - H04B 7/06964: {Re-selection of one or more beams after beam failure} - H04W 74/0833: Random access procedures, e.g. with 4-step access - H04W 74/0838: using contention-free random access [CFRA] - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION ## Abstract There is provided a method comprising: determining channel condition for each of the plurality of beams; selecting, based on the channel conditions, a predetermined number of beams suitable for beam failure recovery; and determining the periodicity preference for each of the predetermined number of beams. ## Claims ### Claim 1 An apparatus, comprising: at least one processor and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to: detect at least one beam from a network node; determine, based on at least one predetermined criterion, a periodicity preference of random access occasions for one or more beams of the at least one beam; and indicate the periodicity preference of random access occasions for the one or more beams to the network node. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the random access occasions are useable for beam failure recovery. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the periodicity preference of random access occasions for the one or more beams comprise at least a first periodicity preference for at least a first beam and a second periodicity preference for at least a second beam, the first and second periodicity preferences being different. ### Claim 4 (depends on 1) The apparatus of claim 1, wherein there is a default random access occasion periodicity associated with all beams configured for beam failure recovery, and the determined periodicity preference of random access occasions for the one or more beams comprise at least one periodicity preference that is different than the default random access occasion periodicity. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the at least one predetermined criterion is based on at least one of: signal quality of the corresponding beam, mobility of the apparatus, required service from the apparatus, maximum permissible exposure limit, or multi-panel capability. ### Claim 6 (depends on 1) The apparatus of claim 1, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus further to: receive, from the network node, a configuration for beam failure recovery, wherein the configuration defines random access occasions for at least one beam suitable for beam failure recovery and the configuration is at least partly based on the indicated periodicity preference of random access occasions for the one or more beams; and apply, in case of beam failure recovery process, the received configuration. ### Claim 7 (depends on 1) The apparatus of claim 1, wherein the at least one beam comprises a plurality of beams, and the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus further to: determine channel condition for each of the plurality of beams; select, based on the channel conditions, a predetermined number of beams suitable for beam failure recovery; and determine the periodicity preference for each of the selected predetermined number of beams. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus further to: indicate the periodicity preference of random access occasions for the one or more beams by indicating to the network node only one or more beam indices for which the apparatus prefers a different periodicity of random access occasions than a default random access occasion periodicity. ### Claim 9 (depends on 1) The apparatus of claim 1, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus further to: receive, from the network node, a first configuration for beam failure recovery, wherein the first configuration indicates at least one beam suitable for beam failure recovery and a default random access occasion periodicity for all of the at least one beam indicated in the first configuration; determine the periodicity preference of random access occasions for the one or more beams indicated in the first configuration; indicate the periodicity preference of random access occasions for the one or more beams by indicating to the network node one or more beam indices, among the at least one beam indicated in the first configuration, for which the apparatus prefers a different periodicity of random access occasions than the default random access occasion periodicity; and receive, from the network node, a second configuration for beam failure recovery, wherein the second configuration indicates the one or more beams suitable for beam failure recovery and wherein the random access occasion periodicity of the one or more beams is at least partly based on the indicated periodicity preference of random access occasions for the one or more beams. ### Claim 10 (depends on 1) The apparatus of claim 1, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus further to: indicate the periodicity preference of random access occasions for the one or more beams to the network node by indicating the one or more beams to the network node in an order defined by the corresponding periodicity preference of random access occasions for the one or more beams. ### Claim 11 (depends on 10) The apparatus of claim 10, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus further to: indicate, as an actual value, only the highest or lowest one of the periodicity preference of random access occasions for the one or more beams to the network node. ### Claim 12 (depends on 1) The apparatus of claim 1, wherein there are predetermined ranges of periodicity preferences, and the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus further to: determine one of the predetermined ranges for each of the periodicity preference of random access occasions for the one or more beams; and indicate the periodicity preference of random access occasions for the one or more beams to the network node by indicating the determined one or more periodicity ranges. ### Claim 13 (depends on 1) The apparatus of claim 1, wherein each of the random access occasions is reserved for a contention free random access. ### Claim 14 (depends on 1) The apparatus of claim 1, wherein the apparatus is or is comprised in a user equipment and the apparatus is operating according to New Radio. ### Claim 15 An apparatus, comprising: at least one processor and at least one memory including a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to: receive, from at least one user equipment, information indicating a periodicity preference of random access occasions for at least one beam; determine, at least partly based on the received information, a beam failure recovery configuration for each of the at least one beam, the configuration defining at least random access occasion periodicity for each of the at least one beam; and transmit the at least one beam failure recovery configuration to the at least one user equipment. ### Claim 16 (depends on 15) The apparatus of claim 15, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus further to: request the at least one user equipment to provide the information indicating the periodicity preference of random access occasions for at least one beam. ### Claim 17 (depends on 15) The apparatus of claim 15, wherein the at least one configuration comprises at least a first random access occasion periodicity for at least a first beam and a second random access occasion periodicity for at least a second beam, the first and second periodicities being different. ### Claim 18 (depends on 15) The apparatus of claim 15, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus further to: receive an indication of a predetermined number of beams suitable for beam failure recovery; determine a set of beams among the predetermined number of beams; determine the beam failure recovery configuration for each beam in the set of beams; and transmit to the at least one user equipment information indicating which beam each configuration is associated with. ### Claim 19 (depends on 15) The apparatus of claim 15, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus further to: indicate to the at least one user equipment a set of periodicity preferences the at least one user equipment is allowed to request. ### Claim 20 A method, comprising: detecting at least one beam from a network node; determining, based on at least one predetermined criterion, a periodicity preference of random access occasions for one or more beams of the at least one beam; and indicating the periodicity preference of random access occasions for the one more beams to the network node.