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WO2025023739A1 - Gestion de transfert conditionnel avec un scg candidat dans un réseau de communication sans fil - Google Patents

Gestion de transfert conditionnel avec un scg candidat dans un réseau de communication sans fil Download PDF

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Publication number
WO2025023739A1
WO2025023739A1 PCT/KR2024/010730 KR2024010730W WO2025023739A1 WO 2025023739 A1 WO2025023739 A1 WO 2025023739A1 KR 2024010730 W KR2024010730 W KR 2024010730W WO 2025023739 A1 WO2025023739 A1 WO 2025023739A1
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Prior art keywords
scg
cho
candidate
cell
conditional
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Aby Kanneath ABRAHAM
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/34—Reselection control
    • H04W36/36—Reselection control by user or terminal equipment
    • H04W36/362—Conditional handover
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/19—Connection re-establishment

Definitions

  • the present disclosure is related to wireless communication network systems. More particularly, the present disclosure is related to a method and system for handling of a Conditional Handover (CHO) with a candidate Secondary Cell Group (SCG) in the wireless communication network system.
  • CHO Conditional Handover
  • SCG Secondary Cell Group
  • 5G 5th Generation
  • NR New Radio
  • RRC_IDLE mode mobility is accomplished using a process known as cell reselection. Mobility is carried out using a process known as handover in RRC_CONNECTED mode up till NR R17.
  • Network-controlled mobility is applicable to RRC_CONNECTED user equipment (UEs).
  • UEs RRC_CONNECTED user equipment
  • the next generation Node B (gNB) in NR must explicitly initiate Radio Resource Control (RRC) signalling.
  • RRC Radio Resource Control
  • the handover process typically includes of three stages: preparation, execution, and completion.
  • the UE can be configured by the gNB to submit measurements. Then, the gNB will send the RRC reconfiguration message to transfer the UE from the source cell to the destination cell, depending on the measurements reported or on its own perception of the network topology.
  • the UE accesses the target cell and sends a complete RRC reconfiguration complete.
  • 3GPP 3rd Generation Partnership Project
  • gNB may configure the UE with the execution conditions for triggering handover, and once the execution conditions are satisfied, the UE may move to the target cell and send the RRC reconfiguration complete.
  • 3GPP has implemented self-organizing networks (SON) approaches in wireless technologies such as NR to address this issue.
  • SON was initially introduced in 3GPP Release 9.
  • the three types of SON solutions are self-configuration, self-optimization, and self-healing.
  • the SON architecture might be a distributed, hybrid, or centralized system.
  • Mobility robustness optimization (MRO) which lessens the driving test, is a key component of SON.
  • MRO Mobility robustness optimization
  • the UE records and reports a variety of data in the Successful Handover Report (SHR), Radio Link Failure (RLF) Report, Success PSCell change or addition information report (SPR) and other reports.
  • SHR Successful Handover Report
  • RLF Radio Link Failure
  • SPR addition information report
  • CHO including target MCGs and candidate SCGs
  • CHO including target MCG and candidate SCGs, is a handover procedure in the NR-DC scenario that is executed only when the execution condition(s) of candidate PCells and the execution condition(s) of PSCells are met. This procedure may also be called CHO with the candidate SCG(s).
  • the PSCell may not be suitably strong which may lead to SCG failures immediately after the CHO.
  • the principal object of the embodiments herein is to provide handling of a CHO with a candidate SCG in a wireless communication network system.
  • Yet another objective of the embodiments herein is to disclose methods and systems for attempting conditional reconfiguration during cell selection after RLF, when CHO with candidate SCG(s) are configured.
  • Yet another objective of the embodiment herein is to disclose the handling of an attemptCondReconfig flag in the UE when the conditional handover with candidate SCG is configured and/or where the conditional handover is configured, and the conditional reconfiguration message includes SCG configuration.
  • the objectives are achieved by a method for handling a CHO with a candidate SCG in a wireless communication network system.
  • the method includes receiving, by a UE, a conditional reconfiguration configuration for the CHO and information for attempting a conditional reconfiguration upon an RLF. Further, the method includes detecting, by the UE, whether the RLF has occurred. Further, the method includes selecting, by the UE, a cell for which a conditional reconfiguration for the CHO is configured when the RLF has occurred. The selection is performed while a timer is active. Further, the method includes performing, by the UE, that the UE has skipped the conditional reconfiguration based on the conditional reconfiguration configured for the CHO for the selected cell.
  • the conditional reconfiguration configured for the CHO is the conditional reconfiguration configured for the CHO with the candidate SCG. Further, the method includes performing, by the UE, that the UE has initiated a transmission of a RRC reestablishment request message to the network apparatus. The conditional reconfiguration is not configured for the CHO without the candidate SCG for the selected cell.
  • the method includes the timer NR timer, which is a T311 timer.
  • the method includes the selected cell as a target candidate cell, and the selected cell is the first cell selected after detection of the failure.
  • the method includes detecting, by the UE, whether a RLF failure or conditions for logging of the SHR and a SCG failure have occurred or whether conditions for logging of the SPR have occurred. Further, the method includes performing, by the UE, that the UE stores SCG information when the RLF failure or conditions for logging of SHR have occurred, transmitting the stored SCG information to a network apparatus in the wireless network. Further, the method includes performing, by the UE, that the UE stores Master Cell Group (MCG) information when the SCG failure or conditions for logging of SPR are detected, and transmitting the SCG information to the network apparatus in the wireless network.
  • MCG Master Cell Group
  • the method includes the storing and transmitting SCG information, which comprises at least one of the neighbor measurements of the SCG cells, a list of SCG conditions associated with the neighbors of the SCG cells, events fulfilled for the candidate SCG and time elapsed between SCG events for neighbor, associated PCells in the same conditional reconfiguration as SCG neighbor cells, which are candidate PSCells, a time elapsed between the fulfilment of SCG and MCG conditions; whether a PCell condition or a PSCell condition is satisfied for associated PCells or conditional reconfigurations; a first satisfied PSCell event when the PCell event is satisfied first; a time elapsed between the fulfilment of the first fulfilled PCell event and the second satisfied PSCell event when the PCell event is satisfied first.
  • SCG information comprises at least one of the neighbor measurements of the SCG cells, a list of SCG conditions associated with the neighbors of the SCG cells, events fulfilled for the candidate SCG and time elapsed between SCG events for neighbor, associated PCells in the same conditional recon
  • the method includes storing and transmitting the MCG information, which comprises neighbor measurements, a list of MCG conditions associated with neighbors, events fulfilled for MCG, a time elapsed between MCG events, associated PSCells in the same conditional reconfiguration as MCG neighbor candidate cells, a time elapsed between the fulfilment of SCG and MCG conditions, event information, and an order of events.
  • MCG information which comprises neighbor measurements, a list of MCG conditions associated with neighbors, events fulfilled for MCG, a time elapsed between MCG events, associated PSCells in the same conditional reconfiguration as MCG neighbor candidate cells, a time elapsed between the fulfilment of SCG and MCG conditions, event information, and an order of events.
  • the embodiment herein is to provide a UE for handling CHO with a candidate SCG(s) in a wireless communication network system.
  • the UE comprises a memory comprising information about a network apparatus in the wireless network system, a processor, and a CHO optimization controller.
  • the CHO optimization controller receives a conditional reconfiguration for the CHO from a network and information for attempting conditional reconfiguration upon an RLF. Further, the CHO optimization controller detects whether the RLF has occurred. Further, the CHO optimization controller selects a cell for which a conditional reconfiguration for the CHO is configured when the RLF has occurred. The selection is performed while a timer is active.
  • the CHO optimization controller performs to skip the conditional reconfiguration based on the conditional reconfiguration configured for the CHO for the selected cell; the conditional reconfiguration configured for the CHO is the conditional reconfiguration configured for the CHO with the candidate SCG. Further, the CHO optimization controller performs to initiate a transmission of a RRC reestablishment request (such as NR RRC Reestablishment request) message to the network apparatus.
  • the conditional reconfiguration is not configured for the CHO without the candidate SCG for the selected cell.
  • the timer is an NR timer, which is a T311 timer.
  • the selected cell is a target candidate cell, and the selected cell is the first cell selected after detection of the failure.
  • the CHO optimization controller detects whether a RLF failure or conditions for logging the SHR and a SCG failure have occurred or whether conditions for logging the SPR have occurred. Further, the CHO optimization controller stores SCG information when the RLF failure has occurred, and transmits the stored SCG information to a network apparatus in the wireless network. Further, the CHO optimization controller stores MCG information when the SCG failure is detected, and transmits the SCG information to the network apparatus in the wireless network.
  • the SCG information comprises at least one of the neighbor measurements of the SCG cells, a list of SCG conditions associated with neighbors of the SCG cells, events fulfilled for the candidate SCG and time elapsed between SCG events for neighbors, associated PCells in the same conditional reconfiguration as SCG neighbor cells which are candidate PScells, a time elapsed between the fulfilment of SCG and MCG conditions, whether a PCell condition or a PSCell condition is satisfied for associated PCells or conditional reconfigurations; a first satisfied PSCell event when the PCell event is satisfied first; a time elapsed between the fulfilment of the first fulfilled PCell event and the second satisfied PSCell event when the PCell event is satisfied first.
  • the MCG information comprises neighbor measurements, a list of MCG conditions associated with neighbors, events fulfilled for MCG, a time elapsed between MCG events, associated PSCells in the same conditional reconfiguration as MCG neighbor candidate cells, a time elapsed between the fulfilment of SCG and MCG conditions, event information, and an order of events.
  • UE by handling CHO with candidate SCGs through conditional reconfiguration, UE can improve performance in dual connectivity scenarios.
  • Figure 1 illustrates a block diagram of a UE implemented to carry out the disclosed subject matter according to the embodiments disclosed herein;
  • Figure. 2 illustrates a sequence diagram that illustrates handling an attemptCondConfig with conditional reconfiguration, including CHO with Candidate SCG, according to the embodiments disclosed herein;
  • Figure. 3 is a flow chart that illustrates a method for selecting conditional reconfiguration when multiple conditional reconfigurations are configured, according to the embodiments disclosed herein;
  • Figure. 4 is a sequence diagram that illustrates a scenario where the UE initiates a RRC reestablishment when all the associated conditional reconfigurations are CHO with candidate SCG(s) according to the embodiments disclosed herein;
  • Figure. 5 is a sequence diagram that illustrates a scenario for handling the attemptCondConfig with conditional reconfiguration, including CHO with candidate SCG, according to the embodiments as disclosed herein;
  • Figure. 6 is a flow chart that illustrates a method for RLF report or SHR handling when the UE is configured for CHO with Candidate SCG(s), according to the embodiment as disclosed herein;
  • Figure. 7 is a flow chart that illustrates a method for SCG failure information reporting when the UE is configured for CHO with candidate SCG(s) according to the embodiments as disclosed herein;
  • Figure. 8 is a flow chart that illustrates a method for handling a CHO with a candidate SCG in a wireless communication network system according to the embodiments as disclosed herein.
  • modules As is traditional in the field, embodiments are described and illustrated in terms of blocks that carry out a described function or functions. These blocks, which referred to herein as managers, units, modules, hardware components or the like, are physically implemented by analog and/or digital circuits such as logic gates, integrated circuits, microprocessors, microcontrollers, memory circuits, passive electronic components, active electronic components, optical components, hardwired circuits and the like, and optionally be driven by firmware and software.
  • the circuits for example, be embodied in one or more semiconductor chips, or on substrate supports such as printed circuit boards and the like.
  • circuits constituting a block be implemented by dedicated hardware, or by a processor (e.g., one or more programmed microprocessors and associated circuitry), or by a combination of dedicated hardware to perform some functions of the block and a processor to perform other functions of the block.
  • a processor e.g., one or more programmed microprocessors and associated circuitry
  • Each block of the embodiments be physically separated into two or more interacting and discrete blocks without departing from the scope of the proposed method.
  • the blocks of the embodiments be physically combined into more complex blocks without departing from the scope of the proposed method.
  • Dual connectivity or more technically, multi-radio dual connectivity, is specified by 3GPP in specifications such as TS 37.340.
  • Next-Generation Radio-Access Network NG-RAN
  • MR-DC Multi-Radio Dual Connectivity
  • UE in RRC_CONNECTED is configured to utilize radio resources provided by two distinct schedulers, located in two different NG-RAN nodes connected via a non-ideal backhaul, one providing NR access and the other one providing either Evolved UMTS Terrestrial Radio Access (E-UTRA) or NR access.
  • E-UTRA Evolved UMTS Terrestrial Radio Access
  • One node acts as the master node (MN) and the other as the secondary node (SN).
  • MN master node
  • SN secondary node
  • NG-RAN supports NG-RAN E-UTRA-NR Dual Connectivity (NGEN-DC), in which a UE is connected to one ng-eNB (an E-UTRA base station that can connect to a 5G core) that acts as a MN and one gNB (5G base station) that acts as a SN.
  • NGEN-DC E-UTRA-NR Dual Connectivity
  • a UE is connected to one ng-eNB (an E-UTRA base station that can connect to a 5G core) that acts as a MN and one gNB (5G base station) that acts as a SN.
  • NG-RAN also supports NR-E-UTRA Dual Connectivity (NE-DC), in which a UE is connected to one gNB that acts as a MN and one ng-eNB that acts as a SN.
  • NE-DC NR-E-UTRA Dual Connectivity
  • PSCell change can occur due to mobility and may or may not be associated with the SN change.
  • the SN Change procedure is initiated either by MN or SN and used to transfer a UE context from a source SN to a target SN and to change the SCG configuration in UE from one SN to another.
  • a conditional PSCell Change (CPC) is defined as a PSCell change that is executed by the UE when the execution condition(s) is met. The UE starts evaluating the execution condition(s) upon receiving the CPC configuration and stops evaluating the execution condition(s) once the PSCell change is triggered. Intra-SN CPC without MN involvement and inter-SN CPC initiated either by MN or SN are supported.
  • a 5G NR radio access network also known as the NG-RAN, comprises a number of NR base stations known as gNBs.
  • gNBs can be connected to each other through the Xn interface and will be connected to various core network elements like Access and Mobility Management Function (AMF), User Plane Function (UPF), etc.
  • AMF Access and Mobility Management Function
  • UPF User Plane Function
  • Further gNBs can be divided into two physical entities named Centralized Unit (CU) and Distributed Unit (DU).
  • CU provides support for the higher layers of the protocol stack, such as Session Data Application Protocol (SDAP), Packet Data Convergence Protocol (PDCP), and Radio Resource Control (RRC), while DU provides support for the lower layers of the protocol stack, such as Radio Link Control (RLC), Medium Access Control (MAC), and the physical layer.
  • SDAP Session Data Application Protocol
  • PDCP Packet Data Convergence Protocol
  • RRC Radio Resource Control
  • DU provides support for the lower layers of the protocol stack, such
  • Each gNB can have multiple cells serving many UEs.
  • manual parameter tuning is a costly operation since it depends on a lot of factors like the number of users, number of neighbors, maximum throughput in the cell, average throughput in the cell, etc.
  • the network may also configure the UE with one or more candidate target PCells in the conditional reconfiguration, and each candidate target PCell is associated with one or more candidate PSCells.
  • the UE starts to evaluate the condition of each candidate target PCell and the condition of each associated candidate PSCell upon reception of the conditional reconfiguration.
  • the UE applies the conditional reconfiguration of the corresponding target PCell and the corresponding candidate PSCell.
  • the network provides the configuration parameters for the target PCell and its associated candidate PSCells in the ConditionalReconfiguration IE or similar such IEs.
  • the NW can provide multiple conditional configurations for the same candidate target PCell, for example, each one contains one Master Cell Group (MCG) configuration (for the same candidate target PCell) and one SCG configuration (for a different candidate PSCell).
  • MCG Master Cell Group
  • Embodiments disclosed herein provide a system and method for performing and optimising CHO with candidate SCG(s).
  • the current method involves the UE logging and reporting SCG information during radio link failure.
  • This information includes neighbor measurements, a list of SCG conditions associated with neighbors, events fulfilled for SCG and the time elapsed between SCG events for neighbors, associated PCells in the same conditional reconfiguration as SCG neighbor cells, which are candidate PScells, and the time elapsed between the fulfillment of SCG and MCG conditions in the RLF report.
  • Associated PSCells in the same conditional reconfiguration as MCG neighbor candidate cells, time elapsed between MCG events, neighbor measurements, a list of MCG conditions associated with neighbor and time elapsed between the fulfilment of SCG and MCG conditions are all reported by the UE during SCG failure.
  • the UE may have multiple candidate configurations for the selected cell, it deals with how the UE chooses a configuration while attempting conditional reconfiguration after RLF.
  • the proposed solution provides a method for handling a CHO with a candidate SCG in the wireless network system.
  • FIG. 1 illustrates a block diagram of a UE (100) implemented to carry out the disclosed subject matter according to the embodiments disclosed herein.
  • the UE (100) includes a processor (104), a memory (102), and a CHO optimization controller (108).
  • the UE (100) may be an end-user device that connects with a communication network to access services.
  • the UE (100) may include, but is not limited to, a smartphone, personal computer (PC), tablet, personal device assistant (PDA), and the like.
  • the processor (104) communicates with the memory, and the CHO optimization controller (108).
  • the processor (104) is configured to implement instructions stored in memory (102) and to perform various methods.
  • the processor (104) can include one or a plurality of processors. It is a general-purpose processor such as a central processing unit (CPU), an application processor (AP), or the like, a graphics-only processing unit such as a graphics processing unit (GPU), a visual processing unit (VPU), and/or an Artificial Intelligence (AI) dedicated processor such as a neural processing unit (NPU).
  • the memory (102) of the UE (100) includes storage locations to be addressable through the processor (104).
  • the memory (102) is not limited to a volatile memory and/or a non-volatile memory.
  • the memory (102) can include one or more computer-readable storage media.
  • the memory (102) can include non-volatile storage elements.
  • non-volatile storage elements can include magnetic hard discs, optical discs, floppy discs, and flash memories.
  • the CHO optimization controller (108) is innovative hardware that is realized through the physical implementation of both analog and digital circuits, including logic gates, integrated circuits, microprocessors, microcontrollers, memory circuits, passive and active electronic components, as well as optical components.
  • the CHO optimization controller (108) is communicatively coupled to the memory (102) and the processor (104). Further, the CHO optimization controller (108) receives a conditional reconfiguration configuration for the CHO from a network and information for attempting conditional reconfiguration upon an RLF. Further, the CHO optimization controller (108) detects whether the RLF has occurred. Further, the CHO optimization controller (108) selects a cell for which a conditional reconfiguration for the CHO is configured when the RLF has occurred. The selection is performed while a timer is active. Furthermore, the conditional reconfiguration configured for the CHO is the conditional reconfiguration configured for the CHO with the candidate SCG.
  • the CHO optimization controller (108) performs to skip the conditional reconfiguration based on the conditional reconfiguration configured for the CHO for the selected cell. Further, the CHO optimization controller (108) does not perform conditional reconfiguration for the CHO if there is no CHO configuration without the candidate SCG for the chosen cell. Instead, it starts transmitting an RRC reestablishment request message to the network apparatus.
  • the network apparatus is one instance may be the gNB(104).
  • attemptCondReconfig may be used in various modified forms.
  • modified terms such as attemptCondReconfig flag or attemptCondConfig may be used. These modified terms all refer to the same concept and may be used interchangeably to aid in the understanding of the present invention.
  • Figure 2 illustrates a sequence diagram that illustrates handling an attemptCondConfig with conditional reconfiguration, including CHO with Candidate SCG, according to the embodiments disclosed herein.
  • the UE (100) is in communication with the gNB (104)
  • the UE (100) is configured with a configuration for CHO with candidate SCG(s) and a flag attemptCondConfig. Handling of attemptCondReconfig flag in the UE (100) when the conditional handover with candidate SCG is configured and/or where conditional handover is configured, and the conditional reconfiguration message includes SCG configuration.
  • attemptCondReconfig flag is described in detail in 3gpp specifications such as NR TS 38.331.
  • the UE (100) applies the stored conditional reconfiguration for the candidate cell excluding the SCG configuration or SCG related configuration (for example, releases SCG configuration from the stored conditional reconfiguration for the candidate cell) while performing the conditional reconfiguration when the selected cell is a target candidate cell and it is the first cell selection after failure; for example, the UE (100) applies only the MCG related configuration from the stored condRRCReconfig associated to the selected cell in this scenario.
  • Failures as referred to herein, may be RLF, radio link failure of the MCG or re-configuration with sync failure of the MCG or mobility from NR failure etc. as described in the background.
  • the UE (100) may exclude SCG cell group configuration, SCG radio bearer configuration, SRB3 configuration and other SCG configurations while applying stored condRRCReconfig associated to the selected cell (i.e., does not apply SCG cell group configuration, SCG radio bearer configuration, SRB3 configuration and other SCG configurations).
  • the UE (100) may exclude applying the SCG related configuration configured by MCG also (for e.g., in MCG OtherConfig), in the above scenario.
  • a failure in the MCG is detected.
  • a candidate cell is selected with associated conditional reconfigurations as CHO with Candidate SCG(s). Release the SCG configuration from the conditional reconfiguration at step S203. Without the completion of the SCG reconfiguration, the RRCReconfigurationComplete message was sent to the gNB (104) at step S204.
  • Figure 3 is a flow chart that illustrates a method for selecting conditional reconfiguration when multiple conditional reconfigurations are configured, according to the embodiments disclosed herein.
  • multiple conditional reconfigurations are received in one or multiple RRC messages for the same candidate cell Cx. For instance, information on which conditional reconfiguration to be performed for the candidate cell Cx upon cell selection after the failure may be received. MCG failure is followed by cell selection at step 304. The chosen cell, Cx, was chosen as the initial choice following a failure. At step 306, a conditional reconfiguration is performed according to or based on the information received.
  • Figure 4 is a sequence diagram that illustrates a scenario, where the UE (100) initiates a RRC Reestablishment when all the associated conditional reconfigurations are CHO with Candidate SCG(s) according to the embodiments disclosed herein;
  • the UE (100) is configured with configuration for CHO with Candidate SCG(s) and an attemptCondConfig, and at step S402, failure occurs in MCG and the UE (100) selects a candidate cell where all the associated conditional reconfigurations are CHO with Candidate SCG(s).
  • the UE (100) sends a RRC Reestablishment message to the gNB(104).
  • Figure 5 is a sequence diagram that illustrates a scenario for handling attemptCondConfig with conditional reconfiguration including CHO with Candidate SCG, according to the embodiments as disclosed herein;
  • the UE (100) is configured with configuration for CHO with candidate SCG(s) and attemptCondConfig.
  • failure occurs in MCG and the UE (100) selects a candidate cell with associated conditional reconfigurations as CHO with Candidate SCG(s).
  • the UE (100) keeps the SCG configuration from the conditional reconfiguration.
  • the RRCReconfigurationComplete message is sent to gNB (104), including SCG reconfiguration complete without checking SCG criteria.
  • Embodiments herein disclose methods and systems for attempting conditional reconfiguration during cell selection after RLF, when CHO Conditional Handover with candidate SCG(s) are configured.
  • a NR UE which is configured for the CHO with candidate SCG(s) and which is also configured with attemptCondReconfig, may exclude applying all the configurations configured by IEs such as secondaryCellGroup or mrdc-SecondaryCellGroupConfig while performing the conditional reconfiguration when the selected cell is a target candidate cell and it is the first cell selection after failure.
  • the UE (100) applies the stored conditional reconfiguration for the candidate cell excluding all the configurations configured by IEs such as secondaryCellGroup or mrdc-SecondaryCellGroupConfig in this scenario.
  • the UE (100) sends a RRCReconfigurationComplete without including the SCG RRC reconfiguration complete.
  • RRCReconfigurationComplete is sent after applying the stored conditional reconfiguration for the candidate cell (excluding SCG configuration).
  • the UE Upon selecting a suitable NR cell, the UE shall:
  • the release of SCG configuration is applicable only for performing conditional reconfiguration for this cell selection after failure.
  • the UE (100) keeps SCG configuration in the stored conditional reconfiguration, and may perform CHO with candidate SCG(s) later using the same conditional reconfiguration when both CHO and CPA/CPC conditions are satisfied.
  • the network informs the UE (100) which is configured for the CHO with candidate SCG(s) and which is also configured with attemptCondReconfig whether to release SCG configuration (i.e., whether to apply SCG configuration) while performing the conditional reconfiguration when the selected cell is a target candidate cell, and it is the first cell selection after failure.
  • This may be informed through a RRC message. In an embodiment, this may be through a flag or an enumerated or an indicator in the conditional reconfiguration configuration or any other IEs such as reconfiguration identifiers or other identifiers and indicator informs that upon the selection of the associated candidate cells, release may be performed (or alternatively flag/enum/id/list tells not to perform release of SCG).
  • the UE (100) decides whether to apply SCG configuration while performing the conditional reconfiguration when the selected cell is a target candidate cell, and it is the first cell selection after failure and attemptCondReconfig is configured.
  • the UE (100) (which is configured for the CHO with candidate SCG(s) and which is also configured with attemptCondReconfig) may apply both MCG and SCG configuration (keep the SCG configuration), while performing the conditional reconfiguration when the selected cell is a target candidate cell and it is the first cell selection after failure. Even though the SCG conditions may not be satisfied, the UE (100) includes the SCG reconfiguration complete (RRCReconfigurationComplete) message in the MCG reconfiguration complete message send to the MN. In an embodiment, the UE (100) may inform the network that the Reconfiguration complete is send due to attemptCondReconfig. Network may further release the SCG configuration.
  • SCG reconfiguration complete RRCReconfigurationComplete
  • the UE (100) may apply both MCG and SCG configuration (keep the SCG configuration) while performing the conditional reconfiguration when the selected cell is a target candidate cell and it is the first cell selection after failure, but may not include SCG Reconfiguration complete in the MCG Reconfiguration Complete send.
  • the UE (100) (which is configured for the CHO with candidate SCG(s) and which is also configured with attemptCondReconfig and has performed the conditional reconfiguration when the selected cell is a target candidate cell and it is the first cell selection after failure) may inform the network that it has SCG measurements available (if available).
  • the UE (100) may include an availability indicator in the RRCReconfigurationComplete to inform the network.
  • a NR UE may include this information in the IE UE -MeasurementsAvailable.
  • the network may further retrieve these measurements by sending RRC message such as UEInformationRequest; for e.g., by including a flag SCGMeasAfterCondReconfigReq and the UE (100) reports the available SCG measurements in the UEInformationResponse.
  • RRC message such as UEInformationRequest
  • the UE Upon receiving the UEInformationRequest message, the UE shall, only after successful security activation:
  • measResultServingCell within measResultServingMOList to include RSRP, RSRQ and the available SINR of the serving cell, derived based on SSB;
  • measResultServingCell within measResultServingMOList to include RSRP, RSRQ and the available SINR of the serving cell, derived based on CSI-RS;
  • reportConfig associated with the measId that triggered the measurement reporting includes reportQuantityRS-Indexes and maxNrofRS-IndexesToReport:
  • the UE (100) may store the SCG measurements after failure and reports the same upon request by the network through UEInformationRequest. In an embodiment, the UE (100) may store the SCG measurements in the VarMeasIdleReport or VarLogMeasReport. In an embodiment, the UE (100) may store the SCG measurements in a separate UE (100) variable VarSCGMeasReport and report the same upon request from the network through UEInformationRequest.
  • the UE (100) may discard these stored SCG measurements after sending the same to the network, while moving to RRC_IDLE or RRC_INACTIVE or after a specific timer such as 48h from storing the SCG measurements.
  • the UE (100) (which is configured with attemptCondReconfig) may apply only MCG related configuration from the stored conditional reconfiguration (i.e., release the SCG related configuration) while performing the conditional reconfiguration including SCG, irrespective of whether the UE (100) is configured for CHO with candidate SCG(s) when the selected cell is a target candidate cell (i.e., even when the UE (100) is configured for CHO with SCG configuration and without conditions for CPA/CPC, the UE (100) applies only MCG related configuration), and it is the first cell selection after failure.
  • MCG related configuration i.e., release the SCG related configuration
  • the UE (100) (which is configured for the CHO with candidate SCG(s) and has experienced the failure when the CHO conditions are satisfied, but while waiting for CPA/CPC conditions are fulfilled) performs conditional reconfiguration without performing RRC Reestablishment procedure.
  • the UE (100) (which is configured for the CHO with candidate SCG(s) and is also configured with attemptCondReconfig and has experienced the failure when the CHO conditions are satisfied, but while waiting for CPA/CPC conditions are fulfilled) performs conditional reconfiguration without performing cell selection after failure.
  • the UE (100) (which is configured for the CHO with candidate SCG(s) and has experienced the failure when the CHO conditions are satisfied, but while waiting for CPA/CPC conditions are fulfilled) performs conditional reconfiguration only for MCG (i.e., does not apply SCG configuration) without performing RRC Reestablishment procedure
  • the UE (100) (which is configured for the CHO with candidate SCG(s) and is also configured with attemptCondReconfig and has experienced the failure when the CHO conditions are satisfied, but while waiting for CPA/CPC conditions are fulfilled) performs conditional reconfiguration only for MCG (i.e. doesn't apply SCG configuration) without performing cell selection after failure.
  • the network may inform the UE (100) which conditional reconfiguration to be used for performing various embodiments in this invention (and for the behavior in background) after it has experienced the failure.
  • network when the UE (100) is configured with multiple conditional reconfigurations for the same candidate cell, network includes an indication about which conditional reconfiguration is to be used for performing conditional reconfiguration after the UE (100) has experienced failure and the UE (100) has selected the same candidate cell and it is the first cell selection after failure.
  • the indication may be conditional reconfiguration identifier to be used. This indication may be a flag or enumerated or any such indication and is included in CondReconfigToAddMod SEQUENCE.
  • the UE (100) if the UE (100) receives the information about which conditional reconfiguration to be used for performing conditional reconfiguration after the UE (100) has experienced failure and the UE (100) has selected the same candidate cell and it is the first cell selection after failure, the UE (100) perform conditional reconfiguration according to the received information.
  • selectCondReconfig If present, the UE shall perform conditional reconfiguration using this condReconfig if selected cell is this target candidate cell and it is the first cell selection after failure as described in clause 5.3.7.3.
  • the UE Upon selecting a suitable NR cell, the UE shall:
  • the UE (100) may perform the conditional reconfiguration according to the stored condRRCReconfig including selectCondReconfig, associated to the selected cell only if attemptCondReconfig is also configured.
  • the UE (100) may perform the conditional reconfiguration according to the stored condRRCReconfig including selectCondReconfig, associated to the selected cell irrespective of whether attemptCondReconfig is also configured.
  • the UE (100) which is configured for the CHO with candidate SCG(s) and for the CHO without candidate SCG(s) for the same candidate cell C1, and is also configured with attemptCondReconfig, performs the conditional reconfiguration using the conditional reconfiguration configured for CHO without candidate SCG(s), when the selected cell is the target candidate cell C1, and it is the first cell selection after failure.
  • the UE (100) is configured with CondReconfig with condReconfigId-r16 x, including one of condExecutionCondSCG or condExecutionCondPSCell and is configured with CondReconfig with condReconfigId-r16 y without any of condExecutionCondSCG or condExecutionCondPSCell for the same candidate cell C2.
  • the UE (100) is also configured with attemptCondReconfig. Upon a failure and initiating RRC Reestablishment procedure and selecting the same cell C2, the UE (100) applies the conditional reconfiguration with condReconfigId-r16 y. Alternatively, the UE (100) may select the conditional reconfiguration with candidate SCG(s) in this case (i.e., select condReconfigId-r16 x).
  • the CPC configuration contains the configuration of CPC candidate PSCell(s) and execution condition(s) and may contain the MN configuration for inter-SN CPC.
  • An execution condition may consist of one or two trigger conditions (CPC events A3/A5, as defined in TS 38.331). Only a single Reference Signal (RS) type is supported, and at most two different trigger quantities (e.g., Reference Signal Received Power (RSRP) and Reference Signal Received Quality (RSRQ), RSRP and Signal-to-Interference-plus-Noise Ratio (SINR), etc.) can be configured simultaneously for the evaluation of the CPC execution condition of a single candidate PSCell.
  • RSRP Reference Signal Received Power
  • RSRQ Reference Signal Received Quality
  • SINR Signal-to-Interference-plus-Noise Ratio
  • the UE (100) executes the PSCell change procedure as described in clauses 10.3 and 10.5 or the PCell change procedure as described in clause 9.2.3.2 in TS 38.300 or clause 10.1.2.1 in TS 36.300, regardless of any previously received CPC configuration.
  • the UE (100) releases all stored CPC configurations.
  • the UE (100) is not required to continue evaluating the execution condition of other candidate PSCell(s).
  • the UE (100) releases all stored CPC configurations.
  • SCG the UE (100) releases the stored CPC configurations.
  • the MN adds PSCell during a PSCell addition procedure.
  • a PSCell addition procedure that is executed only when PSCell addition condition(s) are met is called Conditional PSCell Addition (CPA).
  • CPA Conditional PSCell Addition
  • the UE (100) sends SCGFailureInformation to report SCG failures to MN.
  • the purpose of this procedure is to inform MN about an SCG failure the UE (100) has experienced, for example, SCG radio link failure, failure of SCG reconfiguration with sync, SCG configuration failure for RRC message on SRB3, SCG integrity check failure, and consistent uplink LBT failures on PSCell for operation with shared spectrum channel access.
  • the UE (100) behavior during SCGFailure is described in 3GPP specifications. In NR, this is captured in specifications such as TS 38.331 and TS 37.340, as given below.
  • the UE maintains the current measurement configurations from both the MN and the SN, and the UE continues measurements based on the configurations from the MN and the SN if possible.
  • the SN measurements configured to be routed via the MN will continue to be reported after the SCG failure.
  • the UE may not continue measurements based on configuration from the SN after SCG failure in certain cases (for example, the UE cannot maintain the timing of PSCell).
  • the UE upon transmission of the SCGFailureInformation message to the MN, the UE stops evaluating the CPA/CPC execution condition.
  • the UE is not required to continue measurements for candidate PSCell(s) for execution condition upon transmission of the SCGFailureInformation message to the MN.
  • the UE upon initiating the procedure, the UE shall:
  • CHO including target MCGs and candidate SCGs
  • CHO including target MCG and candidate SCGs, is a handover procedure in the NR-DC scenario that is executed only when the execution condition(s) of candidate PCells and the execution condition(s) of PSCells are met. This procedure may also be called CHO with the candidate SCG(s).
  • the network may also configure the UE (100) with one or more candidate target PCells in the conditional reconfiguration, and each candidate target PCell is associated with one or more candidate PSCells.
  • the UE (100) starts to evaluate the condition of each candidate target PCell and the condition of each associated candidate PSCell upon reception of the conditional reconfiguration.
  • the UE (100) applies the conditional reconfiguration of the corresponding target PCell and the corresponding candidate PSCell.
  • the network provides the configuration parameters for the target PCell and its associated candidate PSCells in the ConditionalReconfiguration IE.
  • the NW can provide multiple conditional configurations for the same candidate target PCell, for example, each one contains one MCG configuration (for the same candidate target PCell) and one SCG configuration (for a different candidate PSCell).
  • the IE CondReconfigToAddModList concerns a list of conditional reconfigurations to add or modify, with for each entry the condReconfigId and the associated condExecutionCond/condExecutionCondSCG/condExecutionCondPSCell and condRRCReconfig.
  • the IE ConditionalReconfiguration is used to add, modify, and release the configuration of conditional reconfiguration.
  • ConditionalReconfiguration-r16 SEQUENCE ⁇
  • CondReconfigToRemoveList-r16 SEQUENCE (SIZE (1.. maxNrofCondCells-r16)) OF CondReconfigId-r16
  • attemptCondReconfig If present, the UE shall perform conditional reconfiguration if the selected cell is a target candidate cell and it is the first cell selection after failure as described in clause 5.3.7.3.
  • condReconfigToAddModList List of the configuration of candidate SpCells to be added or modified for CHO, CPA, or CPC.
  • condReconfigToRemoveList List of the configuration of candidate SpCells to be removed.
  • the field is optional and present; need R if the UE is configured with at least a candidate SpCell for CHO. Otherwise, the field is not present.
  • the UE (100) performs conditional reconfiguration if the selected cell is a target cell and if it is the first cell selection after failure.
  • the details of the UE (100) usage of the flag are usually specified in 3GPP specifications, such as TS 38.331. Below is an example extract from the specification.
  • the purpose of this procedure is to re-establish the RRC connection.
  • the UE in RRC_CONNECTED for which Access Stratum (AS) security has been activated with Signaling Radio Bearer (SRB)2 and at least one Data Radio Bearer (DRB)/multicast Radio Bearer (MRB) setup or, for Integrated Access and Backhaul (IAB), SRB2, may initiate the procedure in order to continue the RRC connection.
  • the connection re-establishment succeeds if the network is able to find and verify the valid UE context, if the UE context cannot be retrieved, and the network responds with an RRCSetup according to clause 5.3.3.4.
  • the network applies the procedure, e.g., as follows:
  • the UE shall not initiate the procedure but instead moves to RRC_IDLE directly, with release cause 'other'. If AS security has been activated but SRB2 and at least one DRB or multicast MRB or, for IAB, SRB2, are not setup, the UE does not initiate the procedure but instead moves to RRC_IDLE directly, with the release cause 'RRC connection failure'.
  • the UE initiates the procedure when one of the following conditions is met:
  • the UE Upon initiation of the procedure, the UE shall:
  • stop timer T304 if running
  • stop timer T316 if running
  • release releasePreferenceConfig if configured stop timer T346f, if running
  • DAPS Dual Active Protocol Stack
  • the UE Upon selecting a suitable NR cell, the UE shall:
  • release releasePreferenceConfig if configured and stop timer T346f, if running
  • the UE Upon selecting an inter-RAT cell, the UE shall:
  • the UE which is configured for the CHO with candidate SCG(s) for a candidate cell C1, and is also configured with attemptCondReconfig, avoids performing the conditional reconfiguration using the conditional reconfiguration configured for CHO with candidate SCG(s), even when the selected cell is the target candidate cell C1, and it is the first cell selection after failure.
  • the UE initiates transmission of the RRCReestablishmentRequest without performing the conditional reconfiguration using the conditional reconfiguration configured for CHO without candidate SCG(s).
  • the UE Upon selecting a suitable NR cell, the UE shall:
  • release releasePreferenceConfig if configured and stop timer T346f, if running
  • the UE Upon selecting an inter-RAT cell, the UE shall:
  • AttemptCondReconfig can also be applicable for any other flag or any other way by which the UE (100) is informed by the network to perform conditional reconfiguration after a failure such as RLF or handover failure or Inter-RAT HO failure or any such failure.
  • the conditions in this invention such as "if selected cell is a target candidate cell and it is the first cell selection after failure" for attempting to perform conditional reconfiguration is exemplary and are non-limiting. There may be additional conditions added or this condition may not be mandatory.
  • Figure 6 is a flow chart that illustrates a method for RLF report or SHR handling when the UE is configured for CHO with Candidate SCG(s), according to the embodiment as disclosed herein
  • the UE is configured for the CHO, and there is information for attempting a conditional reconfiguration with the candidate SCG(s).
  • the UE detects whether the RLF occurred.
  • the UE logs and reports the SCG information including neighbor measurement of the SCG cells, a list of SCG conditions associated to neighbors of the SCG cells, events fulfilled for SCG and time elapsed between SCG events for neighbors, associated Pcells in the same conditional reconfiguration as SCG neighbor cells which are candidate Pscells, time elapsed between fulfilment of SCG and MCG conditions in the RLF report, whether a a PCell condition or a PSCell condition is satisfied for associated PCells or conditional reconfigurations, a first satisfied PSCell event when PCell event is satisfied first, a time elapsed between the fulfilment of the first fulfilled PCell event and second satisfied PSCell event when PCell event is satisfied first.
  • the MCG information comprises neighbor measurements, a list of MCG conditions associated with neighbors, events fulfilled for MCG, a time elapsed between MCG events, associated PSCells in the same conditional reconfiguration as MCG neighbor candidate cells, a time elapsed between the fulfilment of SCG and MCG conditions in SCG failure information, event information, and an order of events.
  • the SCG information includes at least one of the following: neighbor measurements of the SCG cells, a list of SCG conditions associated with the neighbors of the SCG cells, events fulfilled for the candidate SCG, the time elapsed between SCG events for neighbors, associated PCells in the same conditional reconfiguration as SCG neighbor cells that are candidate PSCells, the time elapsed between the fulfillment of SCG and MCG conditions, and whether a PCell condition or a PSCell condition is satisfied for associated PCells or conditional reconfigurations.
  • a first satisfied PSCell event occurs when the PCell event is satisfied first, followed by the time elapsed between the fulfillment of the initial PCell event and the subsequent satisfied PSCell event.
  • Figure 7 is a flow chart that illustrates a method for SCG failure information reporting when the UE is configured for CHO with candidate SCG(s) according to the embodiments as disclosed herein
  • the UE (1000) is configured with CHO with Candidate SCG(s).
  • the MCG information is reported.
  • the MCG information includes neighbor measurements, a list of MCG conditions associated with neighbors, events fulfilled for MCG, a time elapsed between MCG events, associated PSCells in the same conditional reconfiguration as MCG neighbor candidate cells, a time elapsed between the fulfilment of SCG, MCG conditions in SCGFailureInformation, and the like.
  • the UE also may also log the MCG information in SPR when there is no failure, but conditions for SPR are fulfilled.
  • the SCG information comprises at least one of neighbor measurements of the SCG cells, a list of SCG conditions associated to neighbors of the SCG cells, events fulfilled for the candidate SCG and the time elapsed between SCG events for neighbors, associated PCells in same conditional reconfiguration as SCG neighbor cells which are candidate PSCells, a time elapsed between fulfilment of SCG and MCG conditions, whether a PCell condition or a PSCell condition is satisfied for associated PCells or conditional reconfigurations, a first satisfied PSCell event when PCell event is satisfied first, a time elapsed between the fulfilment of the first fulfilled PCell event and second satisfied PSCell event when PCell event is satisfied first.
  • the MCG information comprises neighbor measurements, a list of MCG conditions associated to neighbors, events fulfilled for MCG, a time elapsed between MCG events, associated PSCells in the same conditional reconfiguration as MCG neighbor candidate cells, a time elapsed between fulfilment of SCG and MCG conditions, event information and an order of events.
  • the UE which is configured for the CHO with candidate SCG(s) and which is also configured with attemptCondReconfig, applies the stored conditional reconfiguration for the candidate cell with the SCG configuration(s) while performing the conditional reconfiguration when the selected cell is a target candidate cell and it is the first cell selection after failure.
  • the UE which has applied the stored conditional reconfiguration for CHO with candidate SCG(s) after failure, and when the selected cell is a target candidate cell and it is the first cell selection after failure, suspends SCG transmission.
  • the UE which has applied the stored conditional reconfiguration for CHO with candidate SCG(s) after failure, and when the selected cell is a target candidate cell and it is the first cell selection after failure, deactivates SCG(s).
  • the UE which has applied the stored conditional reconfiguration for CHO with candidate SCG(s) after failure, and when the selected cell is a target candidate cell and it is the first cell selection after failure, suspends transmission on SCG bearers.
  • the UE which is configured for multiple conditional reconfigurations for the CHO with candidate SCG(s) and which is also configured with attemptCondReconfig, applies the stored conditional reconfiguration for the candidate cell with the SCG configuration(s) corresponding to the SCG with the highest measurements while performing the conditional reconfiguration when the selected cell (PCell) is a target candidate cell and it is the first cell selection after failure.
  • the UE which is configured for multiple conditional reconfigurations for the CHO with candidate SCG(s) and which is also configured with attemptCondReconfig, applies the stored conditional reconfiguration for the candidate cell with the SCG configuration(s) corresponding to the SCG with strongest RSRP measurements while performing the conditional reconfiguration when the selected cell (PCell) is a target candidate cell and it is the first cell selection after failure.
  • the UE which is configured for multiple conditional reconfigurations for the CHO with candidate SCG(s), and which is also configured with attemptCondReconfig, applies the stored conditional reconfiguration for the candidate cell with the SCG configuration(s) corresponding to the SCG with strongest RSRQ measurements while performing the conditional reconfiguration when the selected cell (PCell) is a target candidate cell and it is the first cell selection after failure.
  • the UE which is configured for multiple conditional reconfigurations for the CHO with candidate SCG(s), and which is also configured with attemptCondReconfig, applies the stored conditional reconfiguration for the candidate cell with the SCG configuration(s) corresponding to the SCG with strongest SINR measurements while performing the conditional reconfiguration when the selected cell (PCell) is a target candidate cell and it is the first cell selection after failure.
  • the UE which is configured for multiple conditional reconfigurations for the CHO with candidate SCG(s) and which is also configured with attemptCondReconfig, applies the stored conditional reconfiguration for the candidate cell with the SCG configuration(s) corresponding to the SCG with the highest number of beams above a threshold while performing the conditional reconfiguration when the selected cell (PCell) is a target candidate cell and it is the first cell selection after failure.
  • the UE which is configured for multiple conditional reconfigurations for the CHO with candidate SCG(s) and which is also configured with attemptCondReconfig, applies the stored conditional reconfiguration for the candidate cell with the SCG configuration(s) corresponding to the SCG if the latest SCG measurements are above a threshold provided by the network.
  • these thresholds are the cell selection thresholds.
  • this threshold is provided by the network node in an RRC message such as an RRC reconfiguration message or an RRC resume message.
  • the UE which is configured for multiple conditional reconfigurations for the CHO with candidate SCG(s) for the same PCell and which is also configured with attemptCondReconfig, applies the stored conditional reconfiguration for the candidate cell with the SCG configuration(s) corresponding to the SCG, which is closer to fulfilling the SCG criteria, while performing the conditional reconfiguration when the selected cell (PCell) is a target candidate cell and it is the first cell selection after failure.
  • the gNB allocates different transaction identifiers for each conditional reconfiguration which it configures for the UE for multiple conditional reconfigurations for the CHO with candidate SCG(s) for the same PCell.
  • the UE Upon performing conditional reconfiguration for the CHO with candidate SCG(s), the UE includes the same transaction identifier in the RRCReconfigurationComplete message, and the target RAN node (MN) identifies the mapped conditional reconfiguration identifier based on the transaction identifier.
  • the UE may inform the network whether it is capable of supporting RLF-Report for conditional handover with candidate SCG(s). In NR, this may be reported using NR RRC message such as the UE Capability Information send from the UE to gNB.
  • the gNB configures the UE to report RLF-report for conditional handover with candidate SCG(s). In an embodiment, in NR, this may be reported using OtherConfig IE in RRCReconfiguration message.
  • the UE (100) which is configured for performing CHO with candidate SCG(s), logs and reports the following information in the RLF report: SCG measurements for the SCG neighbors, where the measurements are configured by either MN or SN.
  • the UE also includes whether those SCG neighbor cells are candidate SCG cells and the candidate PCell or candidate PCells to which each of those neighbor cells which are a candidate PSCell is associated, one or more conditional reconfiguration identifiers to which the neighbor cell which is a candidate PSCell is associated, a list of PSCell events that are satisfied for each of the PCells/conditional reconfigurations and the PSCell event that is satisfied first, and the elapsed time between those PSCell events, whether PCell condition or PSCell condition is satisfied for each of the associated PCells/conditional reconfigurations.
  • the UE also reports the time elapsed between the fulfilment of the first satisfied PCell event and first satisfied PSCell event when PCell event is satisfied first or the time elapsed between the fulfilment of the first fulfilled PCell event and second satisfied PSCell event when PCell event is satisfied first and the time elapsed between the fulfilment of the first satisfied PSCell event and first satisfied PCell event when PSCell event is satisfied first or the time elapsed between the fulfilment of the first fulfilled PSCell event and second satisfied PS/Cell event when PSCell event is satisfied first in the RLF report.
  • the UE logs and reports this information in a successful handover report (SHR) when the SHR conditions are satisfied.
  • SHR successful handover report
  • the UE logs the following in SHR: SCG measurements for the SCG neighbors, where the measurements are configured by either MN or SN.
  • the UE also includes whether those SCG neighbor cells are candidate SCG cells and the candidate PCell or candidate PCells to which each of those neighbor cells which are a candidate PSCell is associated, one or more conditional reconfiguration identifiers to which the neighbor cell which is a candidate PSCell is associated, a list of PSCell events that are satisfied for each of the PCells/conditional reconfigurations and the PSCell event that is satisfied first, and the elapsed time between those PSCell events, whether PCell condition or PSCell condition is satisfied for each of the associated PCells/conditional reconfigurations.
  • the UE also reports the time elapsed between the fulfilment of the first satisfied PCell event and the first satisfied PSCell event when the PCell event is satisfied first, or the time elapsed between the fulfilment of the first fulfilled PCell event and the second satisfied PSCell event when the PCell event is satisfied first, or the time elapsed between the fulfilment of the first satisfied PSCell event and the second satisfied PSCell event when the PSCell event is satisfied first.
  • the UE which is configured for performing CHO with candidate SCG(s) logs and reports the SCG measurements in the RLF-report.
  • the SCG measurements logged and reported are the measurements configured for CPA/CPC within the configuration for CHO with candidate SCG(s) in the RLF-report. This includes cell identifier for SCG and the RSRP, RSRQ and SINR measurements, if configured.
  • the UE also logs and reports whether the neighbor cells for which measurements are reported are candidate cells. For each of the SCG cell for which the measurements are reported, the UE also logs and reports the SCG execution conditions. For e.g.
  • a NR UE configured for performing CHO with candidate SCG(s) logs and reports the following in RLF-Report: the execution condition for each measurement identifier in condExecutionCondSCG or condExecutionCondPSCell associated to the neighbor cell within conditional reconfiguration configuration. If there is at least one fulfilled condition in the logged condExecutionCondSCG or condExecutionCondPSCell, at the moment of radio link failure or handover failure, the UE logs and reports which among the fulfilled condition of SCG is the first fulfilled condition of SCG in RLF-Report.
  • the UE for each of the SCG PScell for which the measurements are reported, the UE also logs one or more conditional reconfiguration identifier(s) associated to the PSCell. For each of those conditional reconfigurations, the UE also logs and reports the SCG execution conditions. For example, a NR UE configured for performing CHO with candidate SCG(s) logs and reports the following in RLF-Report for each conditional reconfiguration identifier: the execution condition for each measurement identifier in condExecutionCondSCG or condExecutionCondPSCell associated to the neighbor cell within conditional reconfiguration configuration.
  • UE If there is at least one fulfilled condition in the logged condExecutionCondSCG or condExecutionCondPSCell, at the moment of radio link failure or handover failure, UE logs and reports which among the fulfilled condition of SCG is the first fulfilled condition of SCG in RLF-Report.
  • the UE for each of the SCG PSCell for which the measurements are reported, the UE also logs one or more PCells associated to the PSCell (PCell which is the candidate cell in the same conditional reconfiguration for CHO with candidate SCG(s)). For each of those PCells, the UE also logs and reports the SCG execution conditions. For e.g.
  • a NR UE configured for performing CHO with candidate SCG(s) logs and reports the following in RLF-Report for each PCell which is the candidate cell in the sane conditional reconfiguration for CHO with candidate SCG(s): the execution condition for each measurement identifier in condExecutionCondSCG or condExecutionCondPSCell associated to the neighbor cell within conditional reconfiguration configuration. If there is at least one fulfilled condition in the logged condExecutionCondSCG or condExecutionCondPSCell, at the moment of radio link failure or handover failure, the UE logs and reports which among the fulfilled condition of SCG is the first fulfilled condition of SCG in RLF-Report.
  • the UE may also report whether CHO condition or CPAC condition is first fulfilled for the conditional reconfiguration, if both CHO and CPAC conditions are fulfilled.
  • the UE may also log and report the time elapsed between the fulfilments of conditions for CHO (if any condition is fulfilled) within the same conditional reconfiguration and the conditions for PSCell (if any condition is fulfilled). This may be the time elapsed between the fulfilment of first fulfilled PCell condition and the first fulfilled PSCell condition (for e.g. when PCell condition is fulfilled first). Alternatively, this may be the time elapsed between the fulfilment of first fulfilled PSCell condition and the first fulfilled PCell condition (for e.g. when PSCell condition is fulfilled first).
  • the UE may report the time elapsed between the fulfilment of first fulfilled PCell condition and the second fulfilled PSCell condition.
  • the UE may report the time elapsed between the fulfilment of second fulfilled PCell condition and the first fulfilled PSCell condition.
  • the UE may report the time elapsed between the fulfilment of second fulfilled PCell condition and the second fulfilled PSCell condition (for e.g. all the above may bewhen PCell condition is fulfilled first).
  • the UE may report the time elapsed between the fulfilment of first fulfilled PSCell condition and the second fulfilled PCell condition.
  • the UE may report the time elapsed between the fulfilment of second fulfilled PSCell condition and the first fulfilled PCell condition.
  • the UE may report the time elapsed between the fulfilment of second fulfilled PSCell condition and the second fulfilled PCell condition. (For e.g. all the above may be when PSCell condition is fulfilled first).
  • the SCG measurements logged and reported in the RLF report when the UE is configured for performing CHO with candidate SCG(s) includes the measurements for all the neighbor cells (i.e. not only the SCG candidate cells configured for CHO with candidate SCG(s)).
  • MN retrieves the SCG related information in the RLF report and SPR and forward the same to SN.
  • SN optimizes the criteria for CPAC in the CHO with conditional SCG(s) and other mobility parameters using the received information.
  • the UE may inform the network whether it is capable of supporting enhancements in SCGFailureInformation for conditional handover with candidate SCG(s). In NR, this may be reported using NR RRC message such as the UE Capability Information send from UE to gNB.
  • the RAN node such as gNB configures the UE to include enhancements for conditional handover with candidate SCG(s) in the SCGFailureInformation.
  • this may be send using OtherConfig Information Element (IE) in RRCReconfiguration message.
  • IE OtherConfig Information Element
  • the UE which is configured for performing CHO with candidate SCG(s) reports the following information in the SCGFailureInformation: measurements of the MCG neighbors (neighbor cells of PCell), where the measurements are configured by the MN.
  • the UE also includes whether those MCG neighbor cells (neighbor cells of PCell) are candidate MCG cells and the candidate PSCell or candidate PSCells to which each of those neighbor MCG cells which are candidate PCells is associated, one or more conditional reconfiguration identifiers to which the neighbor PCell which is a candidate PCell is associated, list of PCell events that are satisfied for each of the PSCells/conditional reconfiugrations and the PCell event which is satisfied first and the elapsed time between those PCell events, whether PCell condition or PSCell condition is satisfied for each of the associated PSCells/conditional reconfigurations.
  • the UE also reports the time elapsed between the fulfilment of the first satisfied PCell event and first satisfied PSCell event when PCell event is satisfied first or the time elapsed between the fulfilment of the first fulfilled PCell event and second satisfied PSCell event when PCell event is satisfied first and the time elapsed between the fulfilment of the first satisfied PSCell event and first satisfied PCell event when PSCell event is satisfied first or the time elapsed between the fulfilment of the first fulfilled PSCell event and second satisfied PS/Cell event when PSCell event is satisfied first.
  • the MCG measurements reported in the SCGFailureInformation are the measurements configured for CHO within the configuration for CHO with candidate SCG(s). This includes the cell identifier (Cell Global Identity (CGI) or Physical Cell Identifier (PCI)+Absolute Radio Frequency Channel Number (ARFCN)) for MCG and the RSRP, RSRQ, and SINR measurements, if configured PCI and ARFCN may be reported if CGI is not available.
  • CGI Cell Global Identity
  • PCI Physical Cell Identifier
  • ARFCN Absolute Radio Frequency Channel Number
  • the UE also logs and reports the MCG execution conditions.
  • a NR UE configured for performing CHO with candidate SCG(s) logs and reports the following in RLF-Report: the execution condition for each measurement identifier in condExecutionCond associated to the neighbor MCG cell within the conditional reconfiguration configuration. If there is at least one fulfilled condition in the logged condExecutionCond, at the moment of SCG failure, the UE logs and reports which among the fulfilled condition of MCG is the first fulfilled condition of MCG in the SCGFailureInformation message.
  • the UE reports one or more conditional reconfiguration identifier(s) associated to the PCell. For each of those conditional reconfigurations, the UE reports the MCG execution conditions. For example, the UE configured for performing CHO with candidate SCG(s) logs and reports the following in RLF-Report for each conditional reconfiguration identifier: the execution condition for each measurement identifier in condExecutionCond associated to the neighbor cell within conditional reconfiguration configuration. If there is at least one fulfilled condition in the logged condExecutionCond, at the moment of radio link failure or handover failure, the UE reports which among the fulfilled condition of MCG is the first fulfilled condition of MCG in SCGFailureInformation message.
  • the UE for each of the SCG PS cells for which the measurements are reported in SCGFailureInformation, the UE also reports one or more PCells associated with the PSCell (the PCell which is the candidate cell in the same conditional reconfiguration for CHO with the candidate SCG(s)). For each of those PCells, the UE also reports the MCG execution conditions. For example, the UE configured for performing CHO with candidate SCG(s) logs and reports the following in SCGFailureInformation for each PCell, which is the candidate cell in the sane conditional reconfiguration for CHO with candidate SCG(s): the execution condition for each measurement identifier in condExecutionCond associated with the neighbor cell within conditional reconfiguration configuration.
  • the UE logs and reports which among the fulfilled condition of MCG is the first fulfilled condition of MCG in SCGFailureInformation.
  • the UE may log the above information in the SPR when the conditions for reporting the SPR are satisfied. For each of the SCG PScells for which the measurements are reported in SPR, the UE also reports one or more PCells associated with the PSCell (PCell, which is the candidate cell in the same conditional reconfiguration for CHO with candidate SCG(s)). For each of those PCells, the UE also reports the MCG execution conditions. For e.g.
  • a NR UE configured for performing CHO with candidate SCG(s) logs and reports the following in SPR for each PCell, which is the candidate cell in the sane conditional reconfiguration for CHO with candidate SCG(s): the execution condition for each measurement identifier in condExecutionCond associated with the neighbor cell within the conditional reconfiguration configuration. If there is at least one fulfilled condition in the logged condExecutionCond,at the moment of radio link failure or handover failure, the UE logs and reports which among the fulfilled condition of MCG is the first fulfilled conditions of MCG in SPR.
  • the UE for each of the MCG PCells for which the measurements are reported in SCGFailureInformation, the UE also logs one or more PSCells associated with the PCell (PSCell, which is the candidate cell in the same conditional reconfiguration for CHO with candidate SCG(s)). For each of those PSCells, the UE also reports the MCG execution conditions of the associated PCell. For e.g.
  • a NR UE configured for performing CHO with candidate SCG(s) logs and reports the following in SCGFailureInformation for each PCell, which is the candidate cell in the sane conditional reconfiguration for CHO with candidate SCG(s): the execution condition for each measurement identifier in condExecutionCond associated with the neighbor cell within the conditional reconfiguration configuration. If there is at least one fulfilled condition in the reported condExecutionCond, at the moment of radio link failure or handover failure, the UE reports that among the fulfilled conditions of MCG, this is the first fulfilled condition of MCG in SCGFailureInformation.
  • the UE may also report whether the CHO condition or CPAC condition is first fulfilled for the conditional reconfiguration if both CHO and CPAC conditions are fulfilled.
  • the UE may also log and report the time elapsed between the fulfilment of conditions for CHO (if any condition is fulfilled) within the same conditional reconfiguration and the conditions for PSCell (if any condition is fulfilled). This may be the time elapsed between the fulfilment of the first fulfilled PCell condition and the first fulfilled PSCell condition (for example, when PCell condition is fulfilled first). Alternatively, this may be the time elapsed between the fulfilment of the first fulfilled PSCell condition and the first fulfilled PCell condition (for example, when the PSCell condition is fulfilled first).
  • the UE may report the time elapsed between the fulfilment of the first fulfilled PCell condition and the second fulfilled PSCell condition.
  • UE may report the time elapsed between the fulfilment of the second fulfilled PCell condition and the first fulfilled PSCell condition.
  • the UE may report the time elapsed between the fulfilment of the second fulfilled PCell condition and the second fulfilled PSCell condition (for example, all the above may be when the PCell condition is fulfilled first).
  • the UE may report the time elapsed between the fulfilment of the first fulfilled PSCell condition and the second fulfilled PCell condition.
  • the UE may report the time elapsed between the fulfilment of the second fulfilled PSCell condition and the first fulfilled PCell condition.
  • the UE may report the time elapsed between the fulfilment of the second fulfilled PSCell condition and the second fulfilled PCell condition. (For example, all the above may be true when the PSCell condition is fulfilled first.).
  • the MCG measurements reported in the SCGFailureInformation when the UE is configured for performing CHO with candidate SCG(s) include the measurements for all the neighbor cells (such as. not only the MCG candidate cells configured for CHO with candidate SCG(s)).
  • SN retrieves the MCG-related information in the SCGFailureInformation and SPR and forwards the same to MN. MN optimizes the criteria for CHO in the CHO with conditional SCG(s) and other mobility parameters using the received information.
  • FIG 8 is a flow chart that illustrates a method for handling a CHO with a candidate SCG in the wireless communication network system, according to the embodiments as disclosed herein;
  • the flow chart includes steps (802-810). Each step is explained in further detail below.
  • step 802 a conditional reconfiguration configuration for the CHO and an information for attempting a conditional reconfiguration upon a RLF is received by the UE.
  • the UE detects whether the RLF has occurred.
  • the UE performs storing SCG information when the RLF failure or conditions for logging of SHR have occurred and transmitting the stored SCG information to a network apparatus in the wireless network and storing MCG information when the SCG failure or conditions for logging of SPR are detected, and transmitting the SCG information to the network apparatus in the wireless network.
  • the SCG information comprises at least one of neighbor measurements of the SCG cells, a list of SCG conditions associated to neighbors of the SCG cells, events fulfilled for the candidate SCG and the time elapsed between SCG events for neighbors, associated PCells in same conditional reconfiguration as SCG neighbor cells which are candidate PSCells, a time elapsed between fulfilment of SCG and MCG conditions, whether a PCell condition or a PSCell condition is satisfied for associated PCells or conditional reconfigurations, a first satisfied PSCell event when PCell event is satisfied first, a time elapsed between the fulfilment of the first fulfilled PCell event and second satisfied PSCell event when PCell event is satisfied first.
  • the measurements of neighbors for the SCG cells are the measurements of neighbors for the SCG cells.
  • the MCG information comprises neighbor measurements, a list of MCG conditions associated to neighbors, events fulfilled for MCG, a time elapsed between MCG events, associated PSCells in the same conditional reconfiguration as MCG neighbor candidate cells, a time elapsed between fulfilment of SCG and MCG conditions, event information and an order of events.
  • step 806 selecting a cell configured for conditional reconfiguration of the CHO when an RLF occurs, with the selection taking place while a timer is running.
  • the selected cell is a target candidate cell, and the selected cell is a first cell selection after the detection of failure.
  • the timer is the NR T311 timer.
  • step 808 performing either skipping the conditional reconfiguration based on the configuration for the CHO for the chosen cell, where the conditional reconfiguration for the CHO aligns with that configured for CHO with the candidate SCG candidates.
  • step 810 initiating the transmission of an RRC reestablishment request message to the network apparatus, where the conditional reconfiguration is not set for the CHO without the candidate SCG for the selected cell.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Des modes de réalisation de la présente invention concernent un procédé de gestion d'un CHO avec un SCG candidat dans un réseau sans fil. Le procédé consiste à recevoir, par un UE (100), une configuration de reconfiguration conditionnelle pour le CHO et des informations pour tenter une reconfiguration conditionnelle lors d'une RLF. Le procédé consiste en outre à détecter si la RLF s'est produite. Le procédé consiste en outre à sélectionner une cellule pour laquelle une reconfiguration conditionnelle pour le CHO est configurée lorsque la RLF s'est produite. La sélection est effectuée tandis qu'un temporisateur est actif. En outre, le procédé consiste à réaliser un saut de la reconfiguration conditionnelle sur la base de la reconfiguration conditionnelle configurée pour le CHO pour la cellule sélectionnée, la reconfiguration conditionnelle configurée pour le CHO étant la reconfiguration conditionnelle configurée pour le CHO avec le SCG candidat. De plus, le procédé consiste à lancer l'émission d'un message de demande de rétablissement RRC à l'appareil de réseau, la reconfiguration conditionnelle n'étant pas configurée pour le CHO sans le SCG candidat pour la cellule sélectionnée.
PCT/KR2024/010730 2023-07-24 2024-07-24 Gestion de transfert conditionnel avec un scg candidat dans un réseau de communication sans fil Pending WO2025023739A1 (fr)

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