# US 2025/0097797 A1 · Methods and apparatuses for mro for pscell change or cpac in nr-u > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2025/0097797 A1 - Document ID: US20250097797A1 - Status: Published application - Kind: A1 - Application number: 18/726,708 - Filed: 2022-01-06 - Published: 2025-03-20 - Earliest claimed: 2022-01-06 - Assignees: Lenovo (Beijing) Limited - Applicants: Lenovo (Beijing) Limited - Inventors: Le Yan; Mingzeng Dai; Lianhai Wu; Yibin Zhuo; Congchi Zhang - Web page: https://patentgrep.com/patent/US20250097797A1 ## CPC - H04W 36/08: Reselecting an access point - H04W 36/0079: {in case of hand-off failure or rejection} - H04W 36/24: Reselection being triggered by specific parameters - H04W 36/305: {Handover due to radio link failure (control signalling for hand-off failure H04W36/0079)} - H04W 36/00692: {using simultaneous multiple data streams, e.g. cooperative multipoint [CoMP], carrier aggregation [CA] or multiple input multiple output [MIMO] (allocation of physical resources in CoMP or in CA H04L5/0035)} - H04W 76/15: Setup of multiple wireless link connections - H04W 76/19: Connection re-establishment - H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72) ## Abstract The present application relates to methods and apparatus for MRO for PSCell change or CPAC in NR-U. One embodiment of the present disclosure provides a master node (MN), comprising: a transceiver; and a processor coupled to the transceiver, wherein the transceiver is configured to receive first information related to downlink (DL) listen before talk (LBT) failure from a first secondary node (SN), and/or second information related to uplink (UL) LBT failure associated with secondary cell group (SCG) failure from one of: a user equipment (UE), or a third node, or a second SN; and wherein the processor is configured to determine whether or not to transfer the first information and/or the second information to the second SN for the second SN to perform a SCG failure type detection. ## Claims ### Claim 1 A master node for wireless communication, comprising: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the master node to: receive first information related to downlink (DL) listen before talk (LBT) failure from a first secondary node (SN), and/or second information related to uplink (UL) LBT failure associated with secondary cell group (SCG) failure from one of a user equipment (UE), a third node, or a second SN; and determine whether or not to transfer the first information and/or the second information to the second SN for the second SN to perform a SCG failure type detection. ### Claim 2 (depends on 1) The master node of claim 1, wherein the at least one processor is further configured to cause the master node to: transfer the first information and/or the second information to the second SN in a case that a failure occurred in primary secondary cell (PSCell) change procedure or conditional PSCell Addition/Change (CPAC) procedure initiated by the second SN. ### Claim 3 (depends on 1) The master node of claim 1, wherein the at least one processor is further configured to cause the master node to: perform the SCG failure type detection based on the first information and/or the second information in a case that a failure occurred in primary secondary cell (PSCell) change procedure or conditional PSCell Addition/Change (CPAC) procedure initiated by the master node. ### Claim 4 (depends on 3) The master node of claim 3, wherein the at least one processor is further configured to cause the master node to: transmit a first message to the first SN to inform that SCG failure occurred due to LBT failure. ### Claim 5 (depends on 1) The master node of claim 1, wherein the at least one processor is further configured to cause the master node to: receive a second message from the first SN regarding which node initiates a primary secondary cell (PSCell) change procedure or a conditional PSCell Addition/Change (CPAC) procedure; and transmit a first response to the first SN indicating a SN initiates the PSCell change procedure or the CPAC procedure, wherein the first information is received from the first SN after transmitting the first response; or a second response to the first SN indicating that the master node initiates the PSCell change procedure or the CPAC procedure. ### Claim 6 (depends on 1) The master node of claim 1, wherein the at least one processor is further configured to cause the master node to: receive a second message from the first SN indicating that LBT related configurations associated with SCG have been modified. ### Claim 7 (depends on 1) The master node of claim 1, wherein the first information includes at least one: a first indication indicating that primary secondary cell (PSCell) change failure or conditional PSCell Addition/Change (CPAC) failure occurred due to LBT failure at the first SN, or due to one or more new radio unlicensed (NR-U) channels in a target PSCell managed by the first SN are unavailable; a PSCell change or CPAC failure type; a second indication indicating that LBT related configurations associated with SCG are to be modified; information associated with one or more NR-U channels which are unavailable; information associated with LBT events in the target PSCell; a Received Signal Strength Indicator (RSSI) of the target PSCell when LBT fails or when the one or more NR-U channels in the target PSCell are unavailable; or a channel occupancy of the target PSCell when LBT fails or when the NR-U channels in target PSCell are unavailable. ### Claim 8 (canceled) ### Claim 9 (canceled) ### Claim 10 (canceled) ### Claim 11 A first secondary node (SN) for wireless communication, comprising: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the first SN to: determine first information related to downlink (DL) listen before talk (LBT) failure; and transmit the first information to a master node. ### Claim 12 (depends on 11) The first SN of claim 11, wherein the at least one processor is further configured to cause the first SN to at least one of: modify LBT related configurations associated with secondary cell group (SCG); or transmit a first message to the master node indicating that the LBT related configurations associated with SCG of the first SN are modified. ### Claim 13 (depends on 11) The first SN of claim 11, wherein the at least one processor is further configured to cause the first SN to: receive a second message indicating that secondary cell group (SCG) failure occurred due to LBT failure. ### Claim 14 (depends on 11) The first SN of claim 11, wherein the at least one processor is further configured to cause the first SN to: transmit a third message to the master node regarding which node initiates a primary secondary cell (PSCell) change procedure or a conditional PSCell Addition/Change (CPAC) procedure; and receive a first response indicating that a second SN initiates the PSCell change procedure or the CPAC procedure, wherein the first information is transmitted to the master node after receiving the first response; or a second response indicating that the master node initiates the PSCell change procedure or the CPAC procedure. ### Claim 15 (depends on 11) The first SN of claim 11, wherein the first information includes at least one of: a first indication indicating that primary secondary cell (PSCell) change failure or conditional PSCell Addition/Change (CPAC) failure occurred due to LBT failure at the first SN, or due to one or more new radio unlicensed (NR-U) channels in a target PSCell managed by the first SN are unavailable; a PSCell change or CPAC failure type; a second indication indicating that LBT related configurations associated with SCG are to be modified; information associated with one or more NR-U channels which are unavailable; information associated with LBT events in the target PSCell; a Received Signal Strength Indicator (RSSI) of the target PSCell when LBT fails or when the one or more NR-U channels in the target PSCell are unavailable; or a channel occupancy of the target PSCell when LBT fails or when the NR-U channels in target PSCell are unavailable. ### Claim 16 A user equipment (UE) for wireless communication, comprising: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the UE to: receive one or more triggering conditions associated with new radio unlicensed (NR-U) for a successful primary secondary cell (PSCell) change report; and generate a successful PSCell change report when at least one triggering condition of the one or more triggering conditions is fulfilled. ### Claim 17 (depends on 16) The UE of claim 16, wherein the one or more triggering conditions include at least one of: listen before talk (LBT) failure occurs in at least one uplink (UL) bandwidth part (BWP) on a source primary cell (PCell); LBT failure occurs in at least one UL BWP on a source PSCell; LBT failure occurs in at least one UL BWP on a target PSCell; a first number of source PCells that have UL BWPs where consistent LBT failure occurs is higher than a first threshold; a second number of source PSCells that have UL BWPs where consistent LBT failure occurs is higher than a second threshold; a third number of target PSCells that have UL BWPs where consistent LBT failure occurs is higher than a third threshold; a fourth number of LBT failure indications received from physical layer in a media access control (MAC) per BWP for the source PCell is higher than a fourth threshold; a fifth number of LBT failure indications received from physical layer in the MAC per BWP for the source PSCell is higher than a fifth threshold; a sixth number of LBT failure indications received from physical layer in the MAC per BWP for the target PSCell is higher than a sixth threshold; a Received Signal Strength Indicator (RSSI) of the source PCell is higher than a seventh threshold; a RSSI of the source PSCell is higher than an eighth threshold; a RSSI of the target PSCell is higher than a ninth threshold; a channel occupancy of the source PCell is higher than a tenth threshold; a channel occupancy of the source PSCell is higher than an eleventh threshold; a channel occupancy of the target PSCell is higher than a twelfth threshold. ### Claim 18 (depends on 16) The UE of claim 16, wherein the successful PSCell change report includes at least one of: one or more uplink (UL) bandwidth part (BWP) identifiers (IDs) on a source primary cell (PCell) where listen before talk (LBT) failure occurs; one or more UL BWP IDs on a source PSCell where LBT failure occurs; one or more UL BWP IDs on a target PSCell where LBT failure occurs; a first number of source PCells that have UL BWPs where consistent LBT failure occurs; a second number of source PSCells that have UL BWPs where consistent LBT failure occurs; a third number of target PSCells that have UL BWPs where consistent LBT failure occurs a fourth number of LBT failure indications received from physical layer in a media access control (MAC) for the source PCell for each BWP; a fifth number of LBT failure indications received from physical layer in the MAC for the source PSCell for each BWP; a sixth number of LBT failure indications received from physical layer in the MAC for the target PSCell for each BWP; a Received Signal Strength Indicator (RSSI) of the source PCell; a RSSI of the source PSCell; a RSSI of the target PSCell; a channel occupancy of the source PCell; a channel occupancy of the source PSCell; or a channel occupancy of the target PSCell. ### Claim 19 A processor for wireless communication, comprising: at least one controller coupled with at least one memory and configured to cause the processor to: receive one or more triggering conditions associated with new radio unlicensed (NR-U) for a successful primary secondary cell (PSCell) change report; and generate a successful PSCell change report when at least one triggering condition of the one or more triggering conditions is fulfilled. ### Claim 20 (depends on 19) The processor of claim 19, wherein the one or more triggering conditions include at least one of: listen before talk (LBT) failure occurs in at least one uplink (UL) bandwidth part (BWP) on a source primary cell (PCell); LBT failure occurs in at least one UL BWP on a source PSCell; LBT failure occurs in at least one UL BWP on a target PSCell; a first number of source PCells that have UL BWPs where consistent LBT failure occurs is higher than a first threshold; a second number of source PSCells that have UL BWPs where consistent LBT failure occurs is higher than a second threshold; a third number of target PSCells that have UL BWPs where consistent LBT failure occurs is higher than a third threshold; a fourth number of LBT failure indications received from physical layer in a media access control (MAC) per BWP for the source PCell is higher than a fourth threshold; a fifth number of LBT failure indications received from physical layer in the MAC per BWP for the source PSCell is higher than a fifth threshold; a sixth number of LBT failure indications received from physical layer in the MAC per BWP for the target PSCell is higher than a sixth threshold; a Received Signal Strength Indicator (RSSI) of the source PCell is higher than a seventh threshold; a RSSI of the source PSCell is higher than an eighth threshold; a RSSI of the target PSCell is higher than a ninth threshold; a channel occupancy of the source PCell is higher than a tenth threshold; a channel occupancy of the source PSCell is higher than an eleventh threshold; a channel occupancy of the target PSCell is higher than a twelfth threshold. ### Claim 21 (depends on 19) The processor of claim 19, wherein the successful PSCell change report includes at least one of: one or more uplink (UL) bandwidth part (BWP) identifiers (IDs) on a source primary cell (PCell) where listen before talk (LBT) failure occurs; one or more UL BWP IDs on a source PSCell where LBT failure occurs; one or more UL BWP IDs on a target PSCell where LBT failure occurs; a first number of source PCells that have UL BWPs where consistent LBT failure occurs; a second number of source PSCells that have UL BWPs where consistent LBT failure occurs; a third number of target PSCells that have UL BWPs where consistent LBT failure occurs a fourth number of LBT failure indications received from physical layer in a media access control (MAC) for the source PCell for each BWP; a fifth number of LBT failure indications received from physical layer in the MAC for the source PSCell for each BWP; a sixth number of LBT failure indications received from physical layer in the MAC for the target PSCell for each BWP; a Received Signal Strength Indicator (RSSI) of the source PCell; a RSSI of the source PSCell; a RSSI of the target PSCell; a channel occupancy of the source PCell; a channel occupancy of the source PSCell; or a channel occupancy of the target PSCell.