# US 12,225,396 B2 · Method for performing radio link monitoring > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,225,396 B2 - Document ID: US12225396B2 - Status: Granted - Kind: B2 - Application number: 18/378,880 - Filed: 2023-10-11 - Published: 2024-02-08 - Granted: 2025-02-11 - Earliest claimed: 2017-11-16 - Assignees: Telefonaktiebolaget LM Ericsson (publ) - Applicants: Telefonaktiebolaget Lm Ericsson (Publ) - Inventors: Iana Siomina; Muhammad Kazmi; Christopher Callender; Helka-Liina Maattanen; Icaro L. J. Da Silva - Web page: https://patentgrep.com/patent/US12225396B2 ## CPC - H04W 24/08: Testing, {supervising or monitoring} using real traffic - H04B 7/0617: {for beam forming} - 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)} - H04W 56/003: {Arrangements to increase tolerance to errors in transmission or reception timing} - H04B 7/0413: MIMO systems - H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT} - H04W 36/0085: {Hand-off measurements} - H04W 36/085: {involving beams of access points} - 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 method for performing radio link monitoring comprises performing, by a user equipment (UE), a radio link monitoring (RLM) procedure with first RLM parameters; receiving, at the UE, a message including at least one second RLM parameter; identifying, by the UE, a difference between the first RLM parameters and the at least one second RLM parameter; and resetting, at the UE, at least one of the first RLM parameters in response to identifying the difference between the first RLM parameters and the at least one second RLM parameter. The method may configure the UE upon performing RLM by adapting the difference between the current RLM parameters and the future parameters, so that the UE behavior may become clear. ## Claims ### Claim 1 A method for performing radio link monitoring comprising: performing, by a user equipment (UE), a radio link monitoring (RLM) procedure with first RLM parameters; receiving, at the UE, a message including at least one second RLM parameter, wherein the first RLM parameters and the at least one second RLM parameter are RLM reference signal, RLM-RS, resources for in sync and out of sync indications; identifying, by the UE, a difference between the first RLM parameters and the at least one second RLM parameter; and resetting, at the UE, at least a first timer and at least a first counter in response to identifying the difference between the first RLM parameters and the at least one second RLM parameter. ### Claim 2 (depends on 1) The method according to claim 1, wherein the first RLM parameters and the at least one second RLM parameter are a combination of RLM-RS resources and BLER for in-sync and out-of-sync indications. ### Claim 3 (depends on 1) The method according to claim 1, further comprising adapting the first group of the RLM-RS resources and the added second group of RLM-RS resources. ### Claim 4 (depends on 1) The method according to claim 1, wherein identifying the difference between the first RLM parameters and the at least one second RLM parameter comprises: identifying that the first RLM parameters are a first group of RLM-RS resources; and identifying that the at least one second RLM parameter is a second group of RLM-RS resources that replace a subset of the first group of RLM-RS resources. ### Claim 5 (depends on 4) The method according to claim 4, further comprising adapting the partly-replaced first group of the RLM-RS resources and the replacing second group of RLM-RS resources. ### Claim 6 (depends on 1) The method according to claim 1, wherein identifying the difference between the first RLM parameters and the at least one second RLM parameter comprises: identifying that the first RLM parameters are a first group of RLM-RS resources; and identifying that the at least one second RLM parameter is a second group of RLM-RS resources comprising the first group of RLM-RS resources without a subset of RLM-RS resources. ### Claim 7 (depends on 6) The method according to claim 6, further comprising adapting the partly-replaced first group of the RLM-RS resources and the replacing second group of RLM-RS resources. ### Claim 8 (depends on 7) The method according to claim 7, further comprising adapting the partly-replaced first group of the RLM-RS resources and the replacing second group of RLM-RS resources. ### Claim 9 (depends on 1) The method according to claim 1, wherein identifying the difference between the first RLM parameters and the at least one second RLM parameter comprises: identifying that the first RLM parameters are a first group of RLM-RS resources; and identifying that the at least one second RLM parameter is a second group of RLM-RS resources which replace the first group of RLM-RS resources. ### Claim 10 A user equipment for performing radio link monitoring, comprising: at least one processor; and at least one storage that stores processor-executable instructions, when executed by the processor, causes a user equipment to: perform a radio link monitoring (RLM) procedure with first RLM parameters; process a received message including at least one second RLM parameter, wherein the first RLM parameters and the at least one second RLM parameter are RLM reference signal, RLM-RS, resources for in sync and out of sync indications; identify a difference between the first RLM parameters and the at least one second RLM parameter; and reset at least a first timer and at least a first counter in response to identifying the difference between the first RLM parameters and the at least one second RLM parameter. ### Claim 11 (depends on 10) The user equipment according to claim 10, wherein the first RLM parameters and the at least one second RLM parameter are a combination of RLM-RS resources and BLER for in-sync and out-of-sync indications. ### Claim 12 (depends on 10) The user equipment according to claim 10, wherein the at least one storage stores processor-executable instructions that when executed by the processor further cause the user equipment to adapt the first group of the RLM-RS resources and the added second group of RLM-RS resources. ### Claim 13 (depends on 10) The user equipment according to claim 10, wherein the at least one storage stores processor-executable instructions that when executed by the processor to cause the user equipment to identify the difference between the first RLM parameters and the at least one second RLM parameter, further causes the user equipment to: identify that the first RLM parameters are a first group of RLM-RS resources; and identify that the at least one second RLM parameter is a second group of RLM-RS resources that replace a subset of the first group of RLM-RS resources. ### Claim 14 (depends on 13) The user equipment according to claim 13, wherein the at least one storage stores processor-executable instructions that when executed by the processor further cause the user equipment to adapt the partly-replaced first group of the RLM-RS resources and the replacing second group of RLM-RS resources. ### Claim 15 (depends on 10) The user equipment according to claim 10, wherein the at least one storage stores processor-executable instructions that when executed by the processor to cause the user equipment to identify the difference between the first RLM parameters and the at least one second RLM parameter further causes the user equipment to: identify that the first RLM parameters are a first group of RLM-RS resources; and identify that the at least one second RLM parameter is a second group of RLM-RS resources comprising the first group of RLM-RS resources without a subset of RLM-RS resources. ### Claim 16 (depends on 15) The user equipment according to claim 15, wherein the at least one storage stores processor-executable instructions that when executed by the processor further cause the user equipment adapt the second group of RLM-RS resources. ### Claim 17 (depends on 16) The user equipment according to claim 16, wherein the at least one storage stores processor-executable instructions that when executed by the processor to cause the user equipment to identify the difference between the first RLM parameters and the at least one second RLM parameter further causes the user equipment to: identify that the first RLM parameters are a first group of RLM-RS resources; and identify that the at least one second RLM parameter is a second group of RLM-RS resources which replace the first group of RLM-RS resources. ### Claim 18 (depends on 17) The user equipment according to claim 17, wherein the at least one storage stores processor-executable instructions that when executed by the processor further cause the user equipment adapt the second group of RLM-RS resources. ### Claim 19 A communication system for performing radio link monitoring comprising: a user equipment, UE, comprising at least one processor configured to perform a radio link monitoring (RLM) procedure with first RLM parameters; a network node comprising at least one processor configured to transmit to the UE a message including at least one second RLM parameter, wherein the first RLM parameters and the at least one second RLM parameter are RLM reference signal, RLM-RS, resources for in sync and out of sync indications; wherein the UE is further configured to: identify a difference between the first RLM parameters and the at least one second RLM parameter; reset at least a first timer and at least a first counter in response to identifying the difference between the first RLM parameters and the at least one second RLM parameter.