# US 11,451,991 B2 · Enhanced measurement filtering configurations for radio-link management and radio resource management > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,451,991 B2 - Document ID: US11451991B2 - Status: Granted - Kind: B2 - Application number: 16/819,342 - Filed: 2020-03-16 - Published: 2020-07-09 - Granted: 2022-09-20 - Earliest claimed: 2017-09-11 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget LM Ericsson (publ) - Inventors: Icaro L. J. da Silva; Muhammad Kazmi; Helka-Liina Määttanen; Iana Siomina - Web page: https://patentgrep.com/patent/US11451991B2 ## CPC - H04W 24/10: Scheduling measurement reports {; Arrangements for measurement reports} - H04B 7/0617: {for beam forming} - H04B 7/0619: {using feedback from receiving side (feedback signaling for adaptive modulation/coding H04L1/0001)} - H04B 17/30: of propagation channels - H04L 5/005: {of common pilots, i.e. pilots destined for multiple users or terminals} - H04L 41/0677: Localisation of faults - H04W 56/001: {Synchronization between nodes} - H04W 76/18: Management of setup rejection or failure - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) - H04B: TRANSMISSION - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A wireless device is configured to perform measurements for radio resource management (RRM) and/or radio link monitoring (RLM). The wireless device performs a plurality of radio measurements. The wireless device filters at least a first subset of the radio measurements using a first filtering configuration and filters at least a second subset of the radio measurements using a second filtering configuration, where the second filtering configuration differs from the first filtering configuration. The first and second filtering configurations apply to first and second different types of reference signals, respectively, or to beam-level measurements and cell-level measurements, respectively. ## Claims ### Claim 1 A method in a wireless device, the method comprising: performing a plurality of radio measurements; filtering at least a first subset of the radio measurements using a first filtering configuration; and filtering at least a second subset of the radio measurements using a second filtering configuration, the second filtering configuration differing from the first filtering configuration; wherein the first and second filtering configurations apply to first and second different types of reference signals, respectively, and wherein the filtering using the first filtering configuration and the filtering using the second filtering configuration each comprise Layer 3 filtering. ### Claim 2 (depends on 1) The method of claim 1, further comprising performing Layer 1 filtering of measured radio samples to obtain the plurality of radio measurements. ### Claim 3 (depends on 1) The method of claim 1, wherein the first and second filtering configurations differ with respect to at least an averaging parameter. ### Claim 4 (depends on 1) The method of claim 1, wherein the Layer 3 filtering for at least one of the filtering using the first filtering configuration and the filtering using the second filtering configuration produces filtered cell-specific quality measurements. ### Claim 5 (depends on 4) The method of claim 4, further comprising performing beam consolidation and selection, based on beam-specific radio measurements, prior to Layer 3 filtering of cell-specific quality measurements. ### Claim 6 (depends on 1) The method of claim 1, wherein the Layer 3 filtering for at least one of the filtering using the first filtering configuration and the filtering using the second filtering configuration produces filtered beam-specific quality measurements. ### Claim 7 (depends on 1) The method of claim 1, wherein the filtering using the first filtering configuration and the filtering using the second filtering configuration each comprise filtering for evaluating radio-link failure (RLF). ### Claim 8 (depends on 7) The method of claim 7, wherein the first and second filtering configurations differ with respect to at least one of: a number of consecutive out-of-sync indications that trigger a start of a RLF timer; a number of consecutive in-sync indications that stop a running RLF timer; an RLF timer duration; and a maximum number of beam failure recovery attempts that trigger declaration of RLF or start of an RLF timer. ### Claim 9 (depends on 1) The method of claim 1, wherein the first and second different types of reference signals are channel-state information reference signals (CSI-RS) and a synchronization signal in a synchronization signal block, respectively. ### Claim 10 (depends on 1) The method of claim 1, further comprising receiving signaling indicating at least one parameter of at least one of the first and second filtering configurations. ### Claim 11 (depends on 1) The method of claim 1, wherein at least one parameter of at least one of the first and second filtering configurations depends on at least one of: a periodicity of obtaining cell-level measurements or a periodicity of obtaining beam-level measurements, or both; a number of beams being measured; a difference in measurement value between two or more beam measurements used to determine a cell-level measurement; and a number of synchronization signal blocks with a synchronization signal burst. ### Claim 12 A method in a network node, the method comprising: sending, to a wireless device, information indicating a first filtering configuration for radio resource management (RRM) and a second filtering configuration for RRM, the second filtering configuration differing from the first filtering configuration; wherein the first and second filtering configurations apply to first and second different types of reference signals, respectively, and wherein the first and second filtering configurations are each for Layer 3 filtering. ### Claim 13 (depends on 12) The method of claim 12, wherein the first and second filtering configurations differ with respect to at least an averaging parameter for Layer 3 filtering. ### Claim 14 (depends on 12) The method of claim 12, wherein the first and second filtering configurations relate to filtering for evaluating radio-link failure (RLF). ### Claim 15 (depends on 14) The method of claim 14, wherein the first and second filtering configurations differ with respect to at least one of: a number of consecutive out-of-sync indications that trigger a start of a RLF timer; a number of consecutive in-sync indications that stop a running RLF timer; an RLF timer duration; and a maximum number of beam failure recovery attempts that trigger declaration of RLF or start of an RLF timer. ### Claim 16 (depends on 12) The method of claim 12, wherein the first and second different types of reference signals are channel-state information reference signals (CSI-RS) and a synchronization signal in a synchronization signal block, respectively. ### Claim 17 A wireless device, comprising: transceiver circuitry configured to transmit and receive radio signals; and processing circuitry operatively associated with the transceiver circuitry and configured to: perform a plurality of radio measurements; filter at least a first subset of the radio measurements using a first filtering configuration; and filter at least a second subset of the radio measurements using a second filtering configuration, the second filtering configuration differing from the first filtering configuration; wherein the first and second filtering configurations apply to first and second different types of reference signals, respectively, and wherein the filtering using the first filtering configuration and the filtering using the second filtering configuration each comprise Layer 3 filtering. ### Claim 18 (depends on 17) The wireless device of claim 17, wherein the processing circuitry is configured to perform Layer 1 filtering of measured radio samples to obtain the plurality of radio measurements. ### Claim 19 (depends on 17) The wireless device of claim 17, wherein the first and second filtering configurations differ with respect to at least an averaging parameter. ### Claim 20 (depends on 17) The wireless device of claim 17, wherein the Layer 3 filtering for at least one of the filtering using the first filtering configuration and the filtering using the second filtering configuration produces filtered cell-specific quality measurements, and wherein the processing circuitry is configured to perform beam consolidation and selection, based on beam-specific radio measurements, prior to Layer 3 filtering of cell-specific quality measurements. ### Claim 21 (depends on 17) The wireless device of claim 17, wherein the Layer 3 filtering for at least one of the filtering using the first filtering configuration and the filtering using the second filtering configuration produces filtered beam-specific quality measurements. ### Claim 22 (depends on 17) The wireless device of claim 17, wherein the processing circuitry is configured to filter using the first filtering configuration and the filter using the second filtering configuration, wherein each comprise filtering for evaluating radio-link failure (RLF). ### Claim 23 (depends on 22) The wireless device of claim 22, wherein the first and second filtering configurations differ with respect to at least one of: a number of consecutive out-of-sync indications that trigger a start of a RLF timer; a number of consecutive in-sync indications that stop a running RLF timer; an RLF timer duration; and a maximum number of beam failure recovery attempts that trigger declaration of RLF or start of an RLF timer. ### Claim 24 (depends on 17) The wireless device of claim 17, wherein the first and second different types of reference signals are channel-state information reference signals (CSI-RS) and a synchronization signal in a synchronization signal block, respectively. ### Claim 25 (depends on 17) The wireless device of claim 17, wherein at least one parameter of at least one of the first and second filtering configurations depends on at least one of: a periodicity of obtaining cell-level measurements or a periodicity of obtaining beam-level measurements, or both; a number of beams being measured; a difference in measurement value between two or more beam measurements used to determine a cell-level measurement; and a number of synchronization signal blocks with a synchronization signal burst. ### Claim 26 A network node, comprising: transceiver circuitry configured to communicate with a wireless device; and processing circuitry operatively associated with the transceiver circuitry and configured to: send, to the wireless device via the transceiver circuitry, information indicating a first filtering configuration for radio resource management (RRM) and a second filtering configuration for RRM, the second filtering configuration differing from the first filtering configuration; wherein the first and second filtering configurations apply to first and second different types of reference signals, respectively, and wherein the first and second filtering configurations are each for Layer 3 filtering. ### Claim 27 (depends on 26) The network node of claim 26, wherein the first and second filtering configurations differ with respect to at least an averaging parameter for Layer 3 filtering. ### Claim 28 (depends on 26) The network node of claim 26, wherein the first and second filtering configurations relate to filtering for evaluating radio-link failure (RLF) and wherein the first and second filtering configurations differ with respect to at least one of: a number of consecutive out-of-sync indications that trigger a start of an RLF timer; a number of consecutive in-sync indications that stop a running RLF timer; an RLF timer duration; and a maximum number of beam failure recovery attempts that trigger declaration of RLF or start of an RLF timer.