Candidate cell channel state information reference signal configuration for cell handover

Abstract

A method, apparatus, and computer program product are provided for providing a Channel State Information Reference Signal (CSI-RS) configuration to a User Equipment (UE) for Layer 1 (L1) measurements and cell configuration. In the context of the method, the method includes: receiving from a network node at least one CSI-RS configuration for a candidate cell, the at least one CSI-RS configuration including a first set of CSI-RS configurations for L1 measurements and a second set of CSI-RS configurations for candidate cell configuration; performing a cell handover to the candidate cell in response to a control message from the network node; and determining a subset of CSI-RS for at least one of beam management or CSI reporting for the candidate cell based on the first set of CSI-RS configurations and the second set of CSI-RS configurations.

Description

Technical Field

[0001] The example implementation generally involves the following signaling technologies: providing channel state information reference signal (CSI-RS) resources for candidate cells to perform layer 1 (L1) measurements for cell handover decisions and L1 measurements for candidate cell configuration, including beam management, CSI reporting, etc. Background Technology

[0002] Common methods for low-layer triggered mobility (LTM) utilize L1 measurements based on synchronization signal blocks (SSBs) to evaluate the quality of candidate cells for handover decisions. These methods typically generate SSB measurements over narrow bandwidths with longer periods and wider beams. Therefore, SSB-based LTM handover can result in poor time and frequency synchronization with the target cell. Alternative measurements with narrower beams and links can be used to improve time and frequency synchronization with the target cell; however, triggering and reporting these alternative measurements may require alternative signaling methods. For example, CSI-RS measurements can complement SSB measurements; however, existing telecommunications methods lack signaling procedures for configuring CSI-RS resources for candidate cells to enable user equipment (UE) to perform appropriate LTM L1 measurements and BM and / or CSI reporting of L1 measurements. Summary of the Invention

[0003] According to example embodiments, a method, apparatus, and computer program product are provided to provide a UE with one or more CSI-RS configurations for candidate cells. In various embodiments, the method, apparatus, and computer program product provide an improved solution for instructing the UE which CSI-RS and / or configurations for pre-handover L1 measurements can be applied to post-handover BM and / or CSI L1 measurements. In this way, the method, apparatus, and computer program product can minimize the overall overhead of providing CSI-RS configurations to the UE.

[0004] In some embodiments, the method, apparatus, and computer program product divide the CSI-RS configuration for a candidate cell into: a first part for candidate cell L1 measurements (e.g., for cell handover decisions, handover measurements, etc.), and a second part for supporting candidate cell configuration (e.g., beam management (BM), CSI acquisition, etc.), wherein one or more subsets of the second part may reference or include one or more subsets of the first part. In some embodiments, the method, apparatus, and computer program product provide the UE with configuration information for one or more CSI-RS resources, CSI-RS resource sets, CSI-RS resource configurations, etc., for LTM measurements. In some embodiments, the UE is configured to expect the measurement RS for LTM CSI reporting to reference the CSI-RS provided for LTM measurements. Additionally, the method, apparatus, and computer program product provide the UE with the corresponding configuration of one or more CSI-RS for the candidate cell under the candidate configuration of the candidate cell. In various embodiments, the candidate configuration or candidate cell configuration refers to the RRCReconfiguration message provided by ltm-CandidateConfig, which may contain the ServingCellConfig or CellGroupConfig of the candidate cell, and the UE uses this configuration after handover to the candidate cell. The candidate configuration of the candidate cell can be referred to as the candidate cell configuration in this paper.

[0005] In the first approach, the method, apparatus, and computer program product configure the UE as expected: the measurement RS for CSI reporting in serving cell procedures within the candidate cell (e.g., intra-cell / inter-cell beam management, CSI acquisition, etc.) can point to either the CSI-RS provided for LTM measurements or the CSI-RS provided under the candidate cell configuration. In this way, the UE can reference either a first part (e.g., a CSI-RS resource outside the candidate cell configuration) or a second part (e.g., a CSI-RS resource within the candidate cell configuration) of the CSI-RS, thereby minimizing overhead.

[0006] In the second approach, in connection with cell handover to a candidate cell, the method, apparatus, and computer program product configure the UE to merge or combine a set of CSI-RS given by LTM measurements of the candidate cell with a set of CSI-RS under the candidate cell configuration of the candidate cell. Furthermore, the UE can be configured to anticipate that measurement RSs for CSI reporting used in serving cell procedures (e.g., intra-cell / inter-cell beam management, CSI acquisition, etc.) can point to CSI-RS from a combined set of CSI-RS. After the UE is handover (or self-handover) to the target candidate cell, the UE can combine the first and second parts to determine and apply the CSI-RS and their configuration for the candidate cell (e.g., for BM, CSI acquisition, etc.). By enabling the UE to generate and use a merged or combined list of configured CSI-RS, the method, apparatus, and computer program product minimize the overhead associated with providing CSI-RS resource configuration to the UE.

[0007] In at least one embodiment, a first method is provided, the method comprising: receiving from a network node at least one CSI-RS configuration for a candidate cell, the at least one CSI-RS configuration including a first set of CSI-RS configurations for performing L1 measurements on the candidate cell, and a second set of CSI-RS configurations for candidate cell configurations associated with a cell handover to the candidate cell; performing a cell handover to the candidate cell in response to a control message from the network node, wherein the control message is at least partially based on a report including at least one L1 measurement for at least one CSI-RS of the candidate cell; and the at least one L1 measurement is generated at least partially based on the first set of CSI-RS configurations; and determining a subset of CSI-RSs for at least one of BM or CSI reporting for the candidate cell, based at least partially on the first set of CSI-RS configurations and the second set of CSI-RS configurations.

[0008] In some embodiments, the method further includes: generating at least one L1 measurement for at least one CSI-RS for a candidate cell, at least partially based on a first set of CSI-RS configurations; and providing a report to a network node including at least one L1 measurement. In some embodiments, the candidate cell is a serving cell in association with cell handover; and the method further includes: generating at least one of at least one BM measurement or at least one CSI L1 measurement for a determined subset of CSI-RSs for the candidate cell; and providing a report to the candidate cell including at least one BM measurement or at least one CSI L1 measurement, such that the candidate cell performs at least one of BM or CSI adaptation at least partially based on the report.

[0009] In some embodiments, the method further includes decoding a second set of CSI-RS configurations in response to performing a cell handover to a candidate cell. In some embodiments, the respective set of CSI-RS configurations includes at least one CSI-RS resource configuration for a corresponding CSI-RS of the candidate cell. In some embodiments, the at least one CSI-RS resource configuration indicates at least one non-zero power (NZP) CSI-RS resource set for a corresponding CSI-RS of the candidate cell. In some embodiments, the candidate cell is a low-layer triggered mobility (LTM) candidate cell. In some embodiments, the network node is a gNodeB.

[0010] As further described below, in some embodiments, one or more operations of the above method are performed by a device including at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the device to perform one or more operations. For example, an apparatus may include at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to: i) receive from a network node at least one CSI-RS configuration for a candidate cell, the at least one CSI-RS configuration including: a first set of CSI-RS configurations for L1 measurements on the candidate cell; and a second set of CSI-RS configurations for candidate cell configurations associated with a cell handover to the candidate cell; ii) perform a cell handover to the candidate cell in response to a control message from the network node, wherein: the control message is based at least in part on a report including at least one L1 measurement for at least one CSI-RS of the candidate cell; and the at least one L1 measurement is generated at least in part based on the first set of CSI-RS configurations; and iii) determine a subset of CSI-RS for at least one of BM or CSI reporting for the candidate cell based at least in part on the first set of CSI-RS configurations and the second set of CSI-RS configurations. In the same example, the apparatus may also perform other operations and / or embody additional aspects of the methods described above.

[0011] In various embodiments, as further described below, a computer program product is provided herein comprising at least one non-transitory computer-readable storage medium storing computer-executable program code instructions, the computer-executable program code instructions including program code instructions configured to perform one or more operations and / or embody additional aspects of the methods described above. For example, a computer program product may include at least one non-transitory computer-readable storage medium storing computer-executable program code instructions, including program code instructions configured to i) receive from a network node at least one CSI-RS configuration for a candidate cell, the at least one CSI-RS configuration including: a first set of CSI-RS configurations for L1 measurements on the candidate cell; and a second set of CSI-RS configurations for candidate cell configurations associated with cell handover to the candidate cell; ii) perform a cell handover to the candidate cell in response to a control message from the network node, wherein: the control message is based at least in part on a report including at least one L1 measurement for at least one CSI-RS for the candidate cell; and at least one L1 measurement is generated based at least in part on the first set of CSI-RS configurations; and iii) determine a subset of CSI-RS for the candidate cell for at least one of BM or CSI reporting, based at least in part on the first set of CSI-RS configurations and the second set of CSI-RS configurations. In the same example, the program code instructions may also be configured to perform additional operations and / or embody additional aspects of the methods described above.

[0012] In various embodiments, as further described below, one or more operations of the above method are performed by an apparatus having components for performing one or more operations. For example, an apparatus may include: i) components for receiving from a network node at least one CSI-RS configuration for a candidate cell, the at least one CSI-RS configuration including: a first set of CSI-RS configurations for performing L1 measurements on the candidate cell; and a second set of CSI-RS configurations for candidate cell configurations associated with a cell handover to the candidate cell; ii) components for performing a cell handover to the candidate cell in response to a control message from the network node, wherein: the control message is based at least in part on a report including at least one L1 measurement for at least one CSI-RS of the candidate cell; and the at least one L1 measurement is generated at least in part based on the first set of CSI-RS configurations; and iii) components for determining a subset of CSI-RS of the candidate cell for at least one of BM or CSI reporting, based at least in part on the first set of CSI-RS configurations and the second set of CSI-RS configurations. In the same example, the apparatus may embody additional aspects and / or include additional components for performing additional operations of the methods described above.

[0013] In at least one embodiment, according to the first method described above, a second method is provided, the second method comprising: receiving from a network node at least one CSI-RS configuration for a candidate cell, the at least one CSI-RS configuration including: at least one CSI-RS identifier for a corresponding RS of the candidate cell; and a corresponding CSI-RS configuration for L1 measurements of the corresponding RS of the candidate cell; and performing a cell handover to the candidate cell in response to a control message from the network node, wherein: the control message is at least partially based on a report including at least one L1 measurement for at least one CSI-RS of the candidate cell; and the at least one L1 measurement is generated at least partially based on the at least one CSI-RS configuration; and determining a subset of CSI-RSs for at least one of BM or CSI reporting for the candidate cell based at least partially on the at least one CSI-RS identifier and the corresponding CSI-RS configuration for L1 measurements of the corresponding RS of the candidate cell.

[0014] In some embodiments, the method further includes: generating at least one L1 measurement for at least one CSI-RS of a candidate cell based at least in part on at least one CSI-RS configuration; and providing a report to a network node including at least one L1 measurement. In some embodiments, the method further includes: determining a set of indexes of CSI-RS of a candidate cell based at least in part on at least one CSI-RS configuration in association with a cell handover to the candidate cell, wherein the set of indexes includes indexes of corresponding CSI-RS of corresponding RSs of the candidate cell; generating at least one BM or CSI L1 measurement for a subset of CSI-RS of the candidate cell based at least in part on the set of indexes of CSI-RS of the candidate cell; and providing a report to the candidate cell including at least one BM or CSI L1 measurement to cause the cell to perform BM or CSI adaptation based at least in part on at least one BM or CSI L1 measurement.

[0015] In some embodiments, the method further includes receiving at least one of a report configuration message or a resource configuration message from a network node, wherein the report configuration message or resource configuration message includes an indication to: reference at least one CSI-RS configuration for L1 measurement to determine the set of indices of CSI-RS for candidate cells, the set of CSI-RS indices being used for at least one of BM or CSI reporting for candidate cells. In some embodiments, the at least one CSI-RS configuration includes: a first set of identifiers for at least one CSI-RS, CSI resource set, or CSI resource configuration set associated with L1 measurement; and a second set of CSI-RS identifiers for at least one CSI-RS, CSI resource set, or resource configuration set, the at least one CSI-RS, CSI resource set, or resource configuration set being associated with a candidate cell configuration (for at least one of BM or CSI reporting) associated with cell handover. In some embodiments, the corresponding CSI-RS identifier of the second set matches the corresponding CSI-RS of the first set; the second set includes a configuration resource set for the corresponding CSI-RS identifier, the CSI configuration resource set being associated with candidate cell configuration and cell handover; and the method further includes: applying the configuration resource set of the second set to generate at least one L1 measurement for generating the corresponding CSI-RS for the candidate cell.

[0016] In some embodiments, a corresponding CSI-RS identifier of the second set is matched with a corresponding CSI-RS of the first set; the first set includes a configuration resource set for the corresponding CSI-RS identifier, the CSI configuration resource set being associated with an L1 measurement of the corresponding RS of the candidate cell; and the method further includes: applying the configuration resource set of the first set to generate at least one L1 measurement of the corresponding CSI-RS of the candidate cell. In some embodiments, the at least one CSI-RS configuration includes an indication of whether to apply the CSI configuration resource set of the first set or the CSI configuration resource set of the second set to generate the at least one L1 measurement of the corresponding CSI-RS of the candidate cell.

[0017] In some embodiments, the method further includes providing a message to a network node indicating the capability to support at least one of BM or CSI reporting for candidate cells in a multipart CSI-RS configuration. In some embodiments, the message includes a number of supportable candidate cells for LTM. In some embodiments, providing the message to the network node causes the network node to provide the message to at least one candidate cell such that the at least one candidate cell generates at least one CSI-RS reporting configuration and a corresponding association between the at least one CSI-RS reporting configuration and at least one CSI-RS resource configuration, at least in part based on the message.

[0018] In some embodiments, the method further includes receiving instructions from a network node to apply at least one CSI-RS configuration of L1 measurements for the corresponding RS of a candidate cell to at least one of at least one BM measurement or at least one CSIL1 measurement for generating a candidate cell associated with cell handover. In some embodiments, the candidate cell is an LTM candidate cell. In some embodiments, the network node is a gNodeB.

[0019] Alternatively or in some embodiments, the second method includes receiving at least one configuration from a network node, the at least one configuration comprising: a set of L1 measurement configurations for a first set of NZP-CSI-RS for candidate cells; and candidate cell configurations for a second set of NZP-CSI-RS with candidate cells; generating a set of L1 measurements for the first set of NZP-CSI-RS based at least in part on the set of L1 measurement configurations; providing a report to the network node including the set of L1 measurements; performing a cell handover to a candidate cell in response to a control message from the network node, wherein the control message is based at least in part on the report including the set of L1 measurements; generating a set of BM or CSI L1 measurements for the second set of NZP-CSI-RS and the first set of NZP-CSI-RS based at least in part on the set of candidate cell configurations and the set of L1 measurement configurations; and providing the set of BM or CSI L1 measurements to the candidate cells so that the candidate cells perform BM or CSI adaptation based at least in part on the set of BM or CSI L1 measurements. As further described below, in some embodiments, one or more operations of the above method are performed by a device including at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the device to perform one or more operations. For example, an apparatus may include at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to: i) receive from a network node at least one CSI-RS configuration for a candidate cell, the at least one CSI-RS configuration including: at least one CSI-RS identifier for a corresponding RS of the candidate cell; and a corresponding CSI-RS configuration for L1 measurements of the corresponding RS of the candidate cell; and ii) perform a cell handover to the candidate cell in response to a control message from the network node, wherein: the control message is based at least in part on a report including at least one L1 measurement for the at least one CSI-RS of the candidate cell; and the at least one L1 measurement is generated at least in part based on the at least one CSI-RS configuration; and iii) determine a subset of the CSI-RS of the candidate cell for at least one of BM or CSI reporting, based at least in part on the at least one CSI-RS identifier and the corresponding CSI-RS configuration for L1 measurements of the corresponding RS of the candidate cell. In the same example, the apparatus may also perform other operations and / or embody additional aspects of the above-described methods.

[0020] In various embodiments, as further described below, a computer program product is provided herein comprising at least one non-transitory computer-readable storage medium storing computer-executable program code instructions, the computer-executable program code instructions including program code instructions configured to perform one or more operations and / or embody additional aspects of the methods described above. For example, a computer program product may include at least one non-transitory computer-readable storage medium storing computer-executable program code instructions, including program code instructions configured to perform the following operations: i) receiving from a network node at least one Channel State Information Reference Signal (CSI-RS) configuration for a candidate cell, the at least one CSI-RS configuration including: at least one CSI-RS identifier for a corresponding RS of the candidate cell; and a corresponding CSI-RS configuration for L1 measurements of the corresponding RS of the candidate cell; and ii) performing a cell handover to the candidate cell in response to a control message from the network node, wherein: the control message is based at least in part on a report including at least one L1 measurement for at least one CSI-RS of the candidate cell; and the at least one L1 measurement is generated at least in part based on the at least one CSI-RS configuration; and iii) determining a subset of the candidate cell's CSI-RS for at least one of BM or CSI reporting based at least in part on the at least one CSI-RS identifier and the corresponding CSI-RS configuration for L1 measurements of the corresponding RS of the candidate cell. In the same example, program code instructions can also be configured to perform additional operations and / or embody additional aspects of the methods described above.

[0021] In various embodiments, as further described below, one or more operations of the above methods are performed by means having components for performing one or more operations. For example, an apparatus may include: i) components for receiving from a network node at least one CSI-RS configuration for a candidate cell, the at least one CSI-RS configuration including: at least one CSI-RS identifier for a corresponding RS of the candidate cell; and a corresponding CSI-RS configuration for L1 measurements of the corresponding RS of the candidate cell; and ii) components for performing a cell handover to the candidate cell in response to a control message from the network node, wherein: the control message is based at least in part on a report including at least one L1 measurement of the at least one CSI-RS of the candidate cell; and the at least one L1 measurement is generated at least in part based on the at least one CSI-RS configuration; and iii) components for determining a subset of the candidate cell's CSI-RS for at least one of BM or CSI reporting based at least in part on the at least one CSI-RS identifier and the corresponding CSI-RS configuration for L1 measurements of the corresponding RS of the candidate cell. In the same example, the apparatus may embody additional aspects and / or include additional components for performing additional operations of the methods described above.

[0022] In at least one embodiment, according to the second method described above, a third method is provided, comprising receiving from a network node at least one CSI-RS configuration for a candidate cell, the at least one CSI-RS configuration comprising: a first portion comprising: at least one CSI-RS identifier for a corresponding RS of the candidate cell; and at least one CSI-RS configuration for L1 measurement of the corresponding RS of the candidate cell; and a second portion comprising: at least one CSI-RS identifier for a second corresponding RS of the candidate cell; and a corresponding CSI-RS configuration for at least one RS of the candidate cell, the corresponding CSI-RS configuration being used for at least one of BM or CSI reporting; and performing a cell handover to the candidate cell in response to a control message from the network node. The control message is based at least in part on a report including at least one L1 measurement of the corresponding CSI-RS for the candidate cell; and the at least one L1 measurement of the corresponding CSI-RS for the candidate cell is generated at least in part on at least one CSI-RS configuration for the L1 measurement of the corresponding RS in the first part; a combination set of configured CSI-RS is generated at least in part on at least one CSI-RS identifier in the first part and at least one CSI-RS identifier in the second part; and a subset of CSI-RS for at least one of BM or CSI reporting for the candidate cell is determined at least in part on the following: a combination set of CSI-RS; and a corresponding CSI-RS configuration for at least one of BM or CSI reporting.

[0023] In some embodiments, the method further includes generating at least one L1 measurement for a candidate cell's corresponding CSI-RS based at least in part on at least one CSI-RS configuration for L1 measurements of the corresponding RS for the first portion; and providing a report to the network node including at least one L1 measurement. In some embodiments, the corresponding CSI-RS identifier in the at least one CSI-RS identifier of the first portion matches the corresponding CSI-RS identifier in the at least one CSI-RS identifier of the second portion; and the method further includes: when determining a subset of the candidate cell's CSI-RS for at least one of BM or CSI reporting, prioritizing the corresponding CSI-RS configuration from the second portion over the at least one CSI-RS configuration from the first portion.

[0024] In some embodiments, a corresponding CSI-RS identifier in at least one CSI-RS identifier of the first part matches a corresponding CSI-RS identifier in at least one CSI-RS identifier of the second part; and the method further includes: when determining a subset of CSI-RS for at least one of BM or CSI reporting of a candidate cell, preferentially using at least one CSI-RS configuration from the first part instead of a corresponding CSI-RS configuration from the second part. In some embodiments, a corresponding CSI-RS identifier in at least one CSI-RS identifier of the first part matches a corresponding CSI-RS identifier in at least one CSI-RS identifier of the second part; and the method further includes: receiving an instruction from a network node; and at least partially based on the instruction, determining whether, when determining a subset of CSI-RS for at least one of BM or CSI reporting of a candidate cell, i) at least one CSI-RS configuration from the first part or ii) a corresponding CSI-RS configuration from the second part is preferentially used.

[0025] In some embodiments, the corresponding CSI-RS identifier of at least one CSI-RS identifier in the second portion embodies a reference to the corresponding CSI-RS identifier of at least one CSI-RS identifier in the first portion; and the method further includes: determining, at least in part based on the reference embodied by the corresponding CSI-RS identifier, a corresponding CSI-RS configuration for at least one CSI-RS configuration for L1 measurement from the first portion, such that the corresponding CSI-RS configuration can be used for at least one of BM or CSI reporting. In some embodiments, the method further includes: receiving a configuration indication including a bit field associated with at least one CSI-RS of the candidate cell, wherein: the bit field is configurable between a first value and a second value; and in the second value, the bit field indicates that the corresponding CSI-RS configuration for L1 measurement in the at least one CSI-RS configuration for L1 measurement is applied to at least one of BM or CSI reporting on the candidate cell; and determining, at least in part based on the corresponding CSI-RS configuration for L1 measurement, a subset of the CSI-RS of the candidate cell for at least one of BM or CSI reporting.

[0026] In some embodiments, a configuration indication is received from a candidate cell. In some embodiments, the method further includes providing a configuration message to a network node indicating the ability to generate a combined set of configured CSI-RSs based at least in part on: a corresponding one of at least one CSI-RS identifiers for a corresponding RS of the candidate cell; and a corresponding one of at least one CSI-RS configurations for L1 measurements of the corresponding RS of the candidate cell. In some embodiments, the method further includes providing a configuration message to a candidate cell indicating the ability to generate a combined set of configured CSI-RSs based at least in part on: a corresponding one of at least one CSI-RS identifiers for a corresponding RS of the candidate cell; and a corresponding one of at least one CSI-RS configurations for L1 measurements of the corresponding RS of the candidate cell. In some embodiments, the configuration message includes the number of supportable candidate cells that can be generated from the corresponding set of configured CSI-RSs.

[0027] In some embodiments, the method further includes receiving a configuration message comprising instructions to perform the following operations in connection with the execution of a cell handover: i) generating a set of combined configuration CSI-RS based at least in part on at least one CSI-RS identifier of a first portion and at least one CSI-RS identifier of a second portion; and ii) using the set of combined configuration CSI-RS for at least one of L1 measurements and BM or CSI reporting of the candidate cell. In some embodiments, the configuration message is received from a network node. In some embodiments, the configuration message is received from a candidate cell. In some embodiments, the candidate cell is a low-layer triggered mobility (LTM) candidate cell. In some embodiments, the network node is a gNodeB.

[0028] As further described below, in some embodiments, one or more operations of the above method are performed by an apparatus including at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to perform one or more operations. For example, an apparatus may include at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to: i) receive from a network node at least one CSI-RS configuration for a candidate cell, the at least one CSI-RS configuration including a first portion and a second portion, the first portion including at least one CSI-RS identifier for a corresponding RS of the candidate cell and at least one CSI-RS configuration for L1 measurement of the corresponding RS of the candidate cell, the second portion including at least one CSI-RS identifier for a second corresponding RS of the candidate cell and a corresponding CSI-RS configuration for at least one RS of the candidate cell, the corresponding CSI-RS configuration being used for at least one of BM or CSI reporting; ii) responding to a request from a network node... The control message executes a cell handover to the candidate cell, wherein the control message is based at least in part on a report including at least one L1 measurement of the corresponding CSI-RS for the candidate cell, and the at least one L1 measurement of the corresponding CSI-RS for the candidate cell is generated at least in part based on at least one CSI-RS configuration for the L1 measurement of the corresponding RS; iii) generating a combined set of configured CSI-RSs based at least in part on at least one CSI-RS identifier of the first part and at least one CSI-RS identifier of the second part; and iv) determining a subset of CSI-RSs for at least one of BM or CSI reporting for the candidate cell based at least in part on: the combined set of CSI-RSs; and the corresponding CSI-RS configuration for at least one of BM or CSI reporting. In the same example, the apparatus may also perform other operations and / or embody additional aspects of the above method.

[0029] In various embodiments, as further described below, a computer program product is provided comprising at least one non-transitory computer-readable storage medium storing computer-executable program code instructions, including program code instructions configured to perform one or more operations and / or embody additional aspects of the methods described above. For example, the computer program product may include at least one non-transitory computer-readable storage medium storing computer-executable program code instructions, including program code instructions configured to perform the following operations: i) receiving from a network node at least one CSI-RS configuration for a candidate cell, the at least one CSI-RS configuration comprising a first portion and a second portion, the first portion comprising at least one CSI-RS identifier for a corresponding RS of the candidate cell and at least one CSI-RS configuration for L1 measurement of the corresponding RS of the candidate cell, the second portion comprising at least one CSI-RS identifier for a second corresponding RS of the candidate cell and a corresponding CSI-RS configuration for at least one RS of the candidate cell, the corresponding CSI-RS configuration being used in BM or CSI reporting. The method includes at least one of the following: ii) performing a cell handover to a candidate cell in response to a control message from a network node, wherein the control message is based at least in part on a report including at least one L1 measurement of the corresponding CSI-RS for the candidate cell, and the at least one L1 measurement of the corresponding CSI-RS for the candidate cell is generated at least in part based on at least one CSI-RS configuration for the L1 measurement of the corresponding RS; iii) generating a combined set of configured CSI-RSs based at least in part on at least one CSI-RS identifier of the first part and at least one CSI-RS identifier of the second part; and iv) determining a subset of CSI-RSs for at least one of BM or CSI reporting for the candidate cell based at least in part on: the combined set of CSI-RSs; and the corresponding CSI-RS configuration for at least one of BM or CSI reporting. In the same example, the program code instructions may also be configured to perform additional operations and / or embody additional aspects of the above methods.

[0030] In various embodiments, as further described below, one or more operations of the above method are performed by an apparatus having components for performing one or more operations. For example, an apparatus may include: i) components for receiving from a network node at least one CSI-RS configuration for a candidate cell, the at least one CSI-RS configuration comprising a first portion and a second portion, the first portion comprising at least one CSI-RS identifier for a corresponding RS of the candidate cell and at least one CSI-RS configuration for L1 measurement of the corresponding RS of the candidate cell, the second portion comprising at least one CSI-RS identifier for a second corresponding RS of the candidate cell and a corresponding CSI-RS configuration for at least one RS of the candidate cell, the corresponding CSI-RS configuration being used for at least one of BM or CSI reporting; ii) components for performing a cell handover to the candidate cell in response to a control message from a network node, wherein: the control message... The apparatus is at least partially based on reports including at least one L1 measurement of the corresponding CSI-RS for the candidate cell; and the at least one L1 measurement of the corresponding CSI-RS for the candidate cell is generated at least partially based on at least one CSI-RS configuration for the L1 measurement of the corresponding RS; iii) a component for generating a combined set of configured CSI-RSs at least partially based on at least one CSI-RS identifier of the first part and at least one CSI-RS identifier of the second part; and iv) a component for determining a subset of CSI-RSs for at least one of BM or CSI reporting for the candidate cell based at least partially on the combined set of CSI-RSs; and the corresponding CSI-RS configuration for at least one of BM or CSI reporting. In the same example, the apparatus may embody additional aspects and / or include additional components for performing additional operations of the above-described method. Attached Figure Description

[0031] Therefore, certain exemplary embodiments of this disclosure have been described in general terms, and reference will be made below to the accompanying drawings, which are not necessarily drawn to scale, and wherein: Figure 1 Examples of communication systems in which exemplary embodiments of the present disclosure may be implemented are shown; Figure 2 A block diagram of an apparatus that can be configured according to an exemplary embodiment of the present disclosure is shown; Figure 3 An example CSI-RS configuration for LTM is shown according to at least one example embodiment of the present disclosure; Figure 4 A signal diagram of a CSI-RS-based LTM is shown according to an exemplary embodiment of the present disclosure; Figure 5 An exemplary CSI-RS configuration for LTM is shown according to at least one example embodiment of the present disclosure; Figure 6 A signal diagram of a CSI-RS-based LTM is shown according to an exemplary embodiment of the present disclosure; Figure 7 This is an example flowchart of the CSI-RS configuration signaling process according to at least one example embodiment of the present disclosure; Figure 8 This is an example flowchart of the CSI-RS configuration signaling process according to at least one example embodiment of the present disclosure; Figure 9 This is an example flowchart of the CSI-RS configuration signaling process according to at least one example embodiment of the present disclosure; Figure 10 The signal diagram of SSB-based LTM according to existing methods is shown.

[0032] Figure 11 A diagram is shown of a Radio Resource Control (RRC) configuration based on LTM resource configuration and reporting configuration according to existing methods; Figure 12 A diagram showing the LTM resource configuration in RRC according to existing methods is illustrated; and Figure 13 A framework for the CSI-RS configuration hierarchy based on existing methods is shown. Detailed Implementation

[0033] Some embodiments will now be described more fully below with reference to the accompanying drawings, which illustrate some, but not all, of the embodiments. In fact, various embodiments may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. The same reference numerals throughout refer to the same elements. As used herein, the terms “data,” “content,” “information,” and similar terms are used interchangeably to refer to data capable of being transmitted, received, and / or stored according to the described embodiments. Therefore, the use of any such terms should not be considered as limiting the spirit and scope of the embodiments.

[0034] Additionally, as used herein, the term "circuit" means: (a) a hardware circuit implementation (e.g., an implementation in analog and / or digital circuitry); (b) a combination of a circuit and (multiple) computer program products comprising software and / or firmware instructions stored on one or more computer-readable storage media that work together to enable a device to perform one or more functions described herein; and (c) a circuit, such as (multiple) microprocessors or portions thereof, which require software or firmware to operate even if the software or firmware is not physically present. This definition of "circuit" applies to all uses of the term herein, including its use in any claim. As another example, as used herein, the term "circuit" also includes an implementation comprising one or more processors and / or portions thereof, along with accompanying software and / or firmware. As another example, the term "circuit" as used herein also includes, for example, baseband integrated circuits or application processor integrated circuits for mobile phones, or similar integrated circuits in servers, cellular network devices, other network devices (such as core network devices), field-programmable gate arrays, and / or other computing devices.

[0035] The term “comprising” means including but not limited to and should be interpreted in the manner commonly used in the patent context. The use of broad terms such as “comprising,” “including,” and “having” should be understood to support narrower terms such as “consisting of,” “substantially consisting of,” and “substantially consisting of.” Furthermore, with respect to the use of the terms “comprising” and “including” and their variations in the detailed description or claims, these terms are intended to be inclusive in a manner similar to the term “including.”

[0036] The phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” “in various embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase may be included in at least one embodiment of this disclosure, but not necessarily in all embodiments of this disclosure. Therefore, a particular feature, structure, or characteristic may be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment.

[0037] As used herein, the terms “example,” “exemplary,” etc., are used to mean “served as an example, instance, or illustration.” Any implementation, aspect, or design described herein as an “example” or “exemplary” is not necessarily to be construed as preferred or advantageous over other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0038] If the specification states that a component or feature "may," "can," "should," "will," "preferably," "possibly," "usually," "optionally," "for example," "often," or "may" (or other such language) include or have a characteristic, then that particular component or feature does not need to be included or have that characteristic. Such a component or feature may be optionally included in some embodiments or may be excluded.

[0039] As used herein, the term "computer-readable medium" refers to signals, non-transitory computer-readable media, etc. The term "non-transitory computer-readable medium" refers to non-transitory storage hardware, non-transitory storage devices, or non-transitory computer system memory that can be accessed by a controller, microcontroller, computing system, or module of a computing system to encode computer-executable instructions or software programs thereon. Non-transitory "computer-readable media" can be accessed by a computing system or module of a computing system to retrieve and / or execute computer-executable instructions or software programs encoded on the medium. Examples of non-transitory computer-readable media may include, but are not limited to, one or more types of hardware memory, non-transitory tangible media (e.g., one or more magnetic storage disks, one or more optical disks, one or more USB flash drives), computer system memory, or random access memory (e.g., DRAM, SRAM, EDO RAM), etc.

[0040] like Figure 1 As shown, a communication network 100 is provided according to various embodiments of this disclosure. In some embodiments, the communication network 100 communicates with a plurality of user equipment (UE) 110. As an example, the network 100 may be deployed within a radio access architecture based on LTE Advanced (LTE-A) and / or New Radio (NR, 5G). However, the system may be deployed in other network architectures, including within other communication networks, such as other communication networks to be developed in the future, such as sixth-generation (6G) networks, and any of several existing networks, including Universal Mobile Telecommunications System (UMTS) radio access networks (UTRAN, E-UTRAN, or NG-RAN), wireless local area networks (WLAN or WiFi), Global Microwave Access Interoperability (WiMAX), Bluetooth®, Personal Communication Services (PCS), ZigBee®, Wideband Code Division Multiple Access (WCDMA), systems using ultra-wideband (UWB) technology, sensor networks, Mobile Ad Hoc Networks (MANET), and Internet Protocol Multimedia Subsystem (IMS), or any combination thereof.

[0041] UE 110 can be any type of user terminal, terminal equipment, etc., to which resources on the air interface are allocated and assigned. For example, UE 110 can be a portable computing device, such as a wireless mobile communication device, including but not limited to the following types of devices: mobile station (mobile phone), smartphone, personal digital assistant (PDA), cell phone, device using a wireless modem (alarm or measuring device, etc.), laptop and / or touchscreen computer, tablet computer, game console, notebook computer, and multimedia device. User equipment may also be referred to as subscriber unit, mobile station, remote terminal, access terminal, user terminal, or user equipment (UE), with only a few names or devices mentioned.

[0042] Network 100 may include multiple network devices, such as various network nodes 120 serving one or more UEs 110. In some embodiments, network node 120 includes a currently serving cell 130 that currently provides network services to one or more UEs 110. The currently serving cell shown in the figures and described herein may also be referred to as a distribution unit, service distribution unit, source unit, etc. The currently serving cell described herein may also be referred to as a source cell. In some embodiments, network nodes include one or more candidate cells (also referred to herein as “candidate target cells”) that are not currently serving UE 110 and embody candidate targets for serving one or more UEs 110. For example, network node 120 may include candidate cells 140a, 140b that are not currently serving UE 110. In various embodiments, this disclosure provides improved systems and techniques for enabling UE 110 to perform L1 candidate cell measurements using CSI-RS. For example, the present method, apparatus, and computer program product may provide one or more CSI-RS configurations to UE 110. In doing so, the method, apparatus, and computer program product enable UE 110 to determine parameters for resource allocation, RS sequences, etc., for generating L1 measurements (e.g., L1-reference received signal power (RSRP), etc.). In various embodiments, the method, apparatus, and computer program product are applicable to inter-network node scenarios, wherein one or more candidate cells 140a, 140b belong to different network nodes 120 (e.g., different gNodeBs, etc.) compared to network node 120 of UE 110's current serving cell.

[0043] In some embodiments, candidate cells 140a and 140b of network node 120 use the same CSI-RS used by UE 110 connected to candidate cell 140 for LTM measurements. In the respective candidate cells 140a and 140b, the CSI-RS is configured to be UE-specific, with a narrower beam, shorter period, and multiple frequency locations compared to the SSB. Therefore, many CSI-RS may be configured compared to the SSB, which is cell-specific and always enabled. Furthermore, for LTM, the corresponding candidate cell configurations for candidate cells 140a and 140b (e.g., given under ServingCellConfig) can be provided to UE 110 for application during cell handover to candidate cells 140a and 140b. In various embodiments, the provided configurations include one or more CSI-RS configurations for beam management (BM) purposes, CSI acquisition and / or reporting purposes, etc. Providing UE 110 with CSI-RS resource configurations for candidate cells can result in significant overhead. In various embodiments, this disclosure provides an improved mechanism for instructing UE 110 on CSI-RS configuration, thereby minimizing the total overhead associated with providing the CSI-RS configuration. For example, UE 110 may perform actions such as... Figure 4 and 6 The functions shown in the diagrams and described herein are illustrated in Figures 400 and 600. As another example, UE 110 can perform functions as shown in... Figure 7 , 8 The functions shown in Figures 9 and 700, 800, and 900 in the flowcharts described herein.

[0044] Network node 120 and UE 110 can be configured to perform L1 measurements, cell handover, and post-handover BM and CSI reporting. For example, network node 120 and UE 110 can be configured to perform LTM cell handover. In various embodiments, LTM refers to the cell handover process, in which the serving cell of UE 110 (e.g., primary cell (PCell) or secondary cell (SCell)) is switched by network 100 by sending an LTM cell handover command. In some embodiments, the LTM cell handover command embodies one or more control messages generated by network node 120 and provided to UE 110. In some embodiments, the control message embodies a Media Access Control Element (MAC CE). For example, the LTM handover command can be delivered via MAC signaling using a MAC CE. In various embodiments, the LTM cell handover decision is based on measurements (e.g., L1 measurements) performed by UE 110 and reported to network node 120. For example, UE 110 may provide an L1 measurement report to network node 120 so that network 120 (e.g., or its serving cell 130) generates an LTM cell handover decision at least in part based on the L1 measurement report. In some embodiments, the measurement and reporting are based on the corresponding LTM candidate cell configuration provided by the network node for one or more candidate cells 140a, 140b. In various embodiments, a candidate cell may refer to one or more neighboring cells of the current serving cell. Additionally, in some embodiments, a candidate cell may refer to the current serving cell of UE 110 (e.g., SCell, etc.).

[0045] In conventional methods, LTM measurements of neighboring candidate cells 140a and 140b are performed using an SSB transmitted by a candidate cell that provides SSB configuration to UE 110. In some embodiments, prior to cell handover, network node 120 optionally activates one or more Transport Configuration Indication (TCI) states for one or more candidate cells 140a and 140b. In some embodiments, in response to the activation of a candidate cell TCI state, UE 110 uses a reference signal associated with one or more activated TCI states to track time and / or frequency synchronization of the corresponding candidate cell. In some embodiments, UE 110 performs early UL synchronization prior to cell handover (e.g., if network node 120 requests or commands it to do so).

[0046] exist Figure 10In the example signaling procedure 1000 for conventional SSB-based cell handover shown, UE 110 may send a MeasurementReport message (e.g., Layer 3 measurement report) to network node 120 (signal 1001). Network node 120 may decide to configure LTM and initiate LTM preparation. Network node 120 may transmit an RRCReconfiguration message including SSB LTM candidate configurations to UE 110 (signal 1002). UE 110 may store the SSB LTM candidate configurations and transmit an RRCReconfigurationComplete message to network node 120 (signal 1003). UE 110 may perform DL synchronization and UL synchronization with one or more candidate cells before receiving a cell handover command (operations 1004a, 1004b). UE 110 may perform early timing advance (TA) acquisition of one or more candidate cells upon request from network node 110 before receiving a cell handover command. For example, UE 110 may receive a Physical Downlink Control Channel (PDCCH) command to trigger Contention-Free Random Access (CFRA) from the serving cell, after which UE 110 may send a preamble to the indicated candidate cell. To minimize data interruption to the serving cell due to CFRA toward one or more candidate cells, UE 110 does not receive a random access response for TA value acquisition from network node 110. Instead, the TA value of the candidate cell can be indicated in a cell handover command (e.g., MAC CE). UE 110 may not maintain a TA timer for the candidate cell. Instead, UE 110 may rely on the network implementation to guarantee TA validity.

[0047] Continuing this scenario, UE 110 can perform SSB-based L1 measurements on one or more configured candidate cells and transmit an SSB-based L1 measurement report to network node 120 (signal 1005). Network node 120 can decide to perform a cell handover to the target cell and transmit a cell handover command (e.g., MAC CE) that triggers the handover, including a candidate configuration index of the target cell (signal 706). UE 110 can handover to the target cell and apply the configuration indicated by the candidate configuration index. If UE 110 does not have a valid TA for the target cell, UE 110 can perform a Random Access Channel (RACH) procedure to the target cell (operation 1007). UE 110 can complete the LTM cell handover procedure by sending an RRCReconfigurationComplete message to the target cell. If UE 110 has performed the RACH procedure according to operation 707, UE 110 can consider that the LTM cell handover was successfully completed when the RACH procedure was successfully completed (operation 1008). For LTM without RACH, when UE 110 determines that network node 120 has successfully received its first UL data, UE 110 can consider the LTM cell handover to have been successfully completed.

[0048] In various embodiments, for LTM, information about measurement resources (e.g., SSBs) from LTM candidate cells 140a and 140b is provided to UE 110 to enable UE 110 to generate measurements. In some embodiments, UE 110 is also configured with an L1 measurement reporting configuration that includes UL resource information, wherein UE 110 can report measurements. For LTM, periodic and semi-persistent reporting on the Physical Uplink Control Channel (PUCCH), semi-persistent reporting on the Physical Uplink Shared Channel (PUSCH), and non-periodic reporting on the PUSCH can be supported. In some embodiments, UE 110 may be configured with one or more LTMCSI reporting configurations (e.g., LTM-CSI-ReportConfig), wherein the corresponding reporting configuration includes an LTM CSI resource configuration (e.g., LTM-CSI-ResourceConfig) that contains information about resources to be used for channel measurements (e.g., L1-RSRP measurements). Figure 11 and 12As shown, LTM resource configurations 1101 and 1200 may include SSBs from one or more candidate cells 140a and 140b. For each reporting configuration, UE 110 may be configured to report M beams from each of the L configurations of candidate cells. For example, the corresponding LTM CSI resource setting (LTM-CSI-ResourceConfig) may include a configuration of LTM-CSI-SSB-ResourceSet, which may include a list of Z ≥ 1 SS / PBCH block indices (e.g., given by ltm-CSI-SSB-ResourceList) and a list of Z LTM-CandidateIds (e.g., given by ltm-CandidateIDList), which refer to candidate cells associated with synchronization signal (SS) / physical broadcast channel (PBCH) block indices. For the corresponding candidate cells 140a and 140b, UE 110 may determine the temporal behavior of the SS / PBCH block resources based on ssb-Periodicity and ssb-PositionsInBurst. In addition, UE 110 can determine the frequency domain behavior of SS / PBCH block resources through higher-layer parameters subCarrierSpacing and ssbFrequency.

[0049] For each candidate cell 140a and 140b, an LTM CSI report configuration can be provided under the configuration of the current serving cell 130. Each report configuration includes an indication of the LTM CSI resource configuration and other parameters related to reporting (e.g., timing and uplink resources for transmitting reports). The LTM CSI resource configuration can contain a set of SSB indices from multiple candidate cells 140a and 140b, which can be placed in a common LTM configuration (e.g., in LTM-Config, such as...). Figure 12 The LTM resource configuration is shown in Figure 1200. Figure 12 As shown, the detailed configuration of the corresponding SSBs for candidate cells 140a and 140b can be indicated in the LTM CSI resource configuration, which is given in the LTM-SSB configuration under the LTM-Candidate Information Element (IE). For each candidate cell 140a and 140b, the LTM-Candidate IE may contain configuration / information (e.g., SSB information for LTM measurements) used by the UE prior to cell handover. The LTM-Candidate IE may also contain a list of NZP-CSI-RS resources currently used to provide information for activating the TCI state associated with the Tracking RS (a type of CSI-RS). This can also be used for LTM measurements utilizing CSI-RS.

[0050] The LTM-Candidate IE may also include a candidate cell configuration containing an RRC container (e.g., ServingCellConfig or CellGroupConfig) given by ltm-CandidateConfig. This RRC container contains all the configuration details that will be used by UE 110 after it moves to a candidate cell (e.g., after a cell handover from the current serving cell 130). In other words, the ltm-CandidateConfig given under the LTM-Candidate IE may contain the configuration details required to perform regular serving cell operations within candidate cells 140a and 140b.

[0051] In various embodiments, LTM offers improvements in handover latency and downtime compared to Layer 3-based mobility. However, existing LTM methods lack specific procedures for supporting CSI-RS measurements to enable CSI-RS-based beam management and other physical layer operations on candidate cells (e.g., before or after LTM cell handover).

[0052] For serving cell procedures, CSI-RS-based measurements and reporting can be configured for serving cell beam management and CSI acquisition purposes. Beam management can be performed to select appropriate beams, and CSI acquisition (e.g., CSI reporting) can be performed to adapt appropriate channel parameters (e.g., modulation, coding rate, etc.) for transmission and reception. Different types of CSI-RS can be configured, namely periodic, semi-persistent, and aperiodic CSI-RS. Figure 13 As shown, the CSI-RS configuration can represent a multi-level hierarchical framework, which includes CSI-ResourceConfig 1301, Non-Zero Power (NZP)-CSI-RS-ResourceSet 1303 and NZP-CSI-RS-Resource 1305 in descending order of hierarchy.

[0053] In various embodiments, CSI-ResourceConfig 1301 defines a set of one or more NZP-CSI-RS-ResourceSets 1303, CSI-IM-ResourceSets, CSI-SSB-ResourceSets, etc. Table 1 provides an example of the contents of CSI-ResourceConfig 1303. Table 2 provides example descriptions of the various fields of CSI-ResourceConfig 1301.

[0054]

[0055] Table 1. Example CSI-ResourceConfig IE

[0056] Table 2. Example CSI-ResourceConfig fields In various embodiments, NZP-CSI-RS-ResourceSet 1303 is a set of NZP-CSI-RS resources (e.g., their corresponding identifiers) and group-specific parameters. Table 3 provides example contents of NZP-CSI-RS-ResourceSet 1303. Table 3 provides example descriptions of the various fields of NZP-CSI-RS-ResourceSet 1303.

[0057]

[0058] Table 3. Example NZP-CSI-Resource Set IE.

[0059]

[0060] Table 4. Example NZP-CSI-RS-ResourceSet fields In various embodiments, NZP-CSI-RS-Resource 1305 is used to configure NZP-CSI-RS transmitted in a cell including the IE, and UE 110 can be configured to measure it. Configuration changes between periodic, semi-persistent, or aperiodic modes of NZP-CSI-RS-Resource may not be supported without release and addition. Table 5 provides example content of NZP-CSI-RS-Resource 1305. Table 6 provides example descriptions of various fields of NZP-CSI-RS-Resource 1305.

[0061]

[0062] Table 5. Example NZP-CSI-RS-ResourceIE

[0063] Table 6. Example NZP-CSI-RS-Resource fields As described herein, using SSB-based L1 measurements to evaluate candidate cell quality for cell handover decisions, compared to CSI-RS measurements, can exhibit disadvantages due to the narrower bandwidth, longer period, and wider beam required to generate SSB measurements. For example, CSI-RS measurements can support narrower beams with larger bandwidth and shorter periods compared to SSB measurements. In doing so, CSI-RS-based methods can achieve greater time and frequency synchronization with the target cell compared to SSB-based methods. However, existing signaling techniques lack an efficient means for configuring CSI-RS resources to the UE to enable L1 measurements of candidate cells. Therefore, providing CSI-RS configuration can lead to significant overhead. In various embodiments, this method, apparatus, and computer program product overcome this challenge by introducing novel signaling techniques for providing CSI-RS configuration of candidate cells to the UE 110.

[0064] For example, the method, apparatus, and computer program product may include providing the CSI-RS configuration for a candidate cell in two parts. A first part of the CSI-RS configuration may be provided to UE 110 outside of the candidate cell RRC configuration (e.g., under LTM-Candidate IE, but not within ltm-CandidateConfig). For example, the first part of the CSI-RS configuration may be provided for an LTM L1 measurement configuration. A second part of the CSI-RS configuration may be provided to UE 110 within a candidate cell configuration (e.g., a serving cell configuration for beam management and other CSI acquisition (including CSI reporting)), which is applied and / or decoded by UE 110 during cell handover. For example, the second part of the CSI-RS configuration may be given within the candidate cell configuration (e.g., ltm-CandidateConfig under LTM-Candidate IE). From the UE's perspective, two sets of CSI-RS configurations may be provided to UE 110. These two sets of CSI-RS configurations may include a first set of CSI-RS configurations for LTM under the LTM candidate IE and a second set of CSI-RS configurations in the candidate cell configuration (e.g., given by the ServingCellConfig or CellGroupConfig within the candidate cell's RRC container, and by ltm-CandidateConfig), which are typically decoded during LTM cell handover. In various embodiments, when the CSI-RS configuration for the candidate cell is divided into two parts as described above, the reporting configuration for beam management after cell handover can reference resource configurations maintained outside the candidate configuration. In doing so, the overhead of providing the CSI-RS configuration can be minimized (e.g., due to the ability to efficiently reference information already possessed by UE 110). Figure 3-9 The example method of providing two parts of CSI-RS configuration is further shown and described in this paper.

[0065] Figure 2 Example devices 200a and 200b according to one embodiment are shown. Devices 200a and 200b may be embodiments of network devices, or may be embodied in or otherwise associated with one or more network devices. For example, device 200a may be embodied in UE 110, and device 200b may be embodied in network node 120 or one or more elements thereof (e.g., serving cell, centralizing unit, candidate cell, etc.).

[0066] Regardless of the device embodying apparatus 200a (or 200b), the apparatus may include a processor 202a (202b), a memory 204a (204b), and a network interface 206a (206b). Apparatus 200a and 200b may be configured to perform the operations described herein, including performing actions for obtaining, generating, and / or determining, respectively, in... Figure 3 and 5 The operation of the CSI-RS configuration shown and described herein is illustrated. For example, devices 200a and 200b can be configured to perform operations in... Figure 4 and 6 The functions shown in and described herein in signaling diagrams 400 and 600. As another example, device 200b can be configured to perform the functions respectively in... Figure 7 , 8 Processes 700, 800, and 900 are shown in Figure 9 and described herein. Apparatus 200b may embody the functions performed by network node 120 when executing one or more operations of processes 700, 800, and 900. Although these components are described with respect to the execution of various functions, it should be understood that a particular implementation must include the use of specific hardware. It should also be understood that some of these components may include similar or common hardware. For example, both sets of circuits may utilize the same processor, network interface, storage medium, etc., to perform their associated functions, so that each set of circuits does not require duplicate hardware. The foregoing description of processors 202a and 204a and network interface 206a of apparatus 200a can be applied to similarly named elements of apparatus 200b (e.g., processors 202b, 204b, and network interface 206b).

[0067] In some embodiments, processor 202a (and / or coprocessor or auxiliary processor or any other processing circuitry otherwise associated with the processor) may communicate with memory 204a via a bus for transferring information between components of the device. Memory 204a is non-transitory and may include, for example, one or more volatile and / or non-volatile memories. In other words, for example, memory 204a may be an electronic storage device (e.g., a non-transitory computer-readable storage medium). Memory 204a may be configured to store information, data, content, applications, instructions, etc., for enabling the device to perform various functions according to the exemplary embodiments disclosed herein. For example, memory 204a may store identifiers of one or more serving cells, candidate cells, CSI-RS resource sets (e.g., SP resource sets, etc.), TCI states, bandwidth portions (BWP), logical channel identifiers, etc. As another example, memory 204a may store CSI-RS resource sets, control messages, etc.

[0068] Processor 202a may be embodied in several different ways and may include, for example, one or more processing devices configured to execute independently. In some non-limiting embodiments, processor 202a may include one or more processors configured in series via a bus to enable independent execution of instructions, pipelines, and / or multithreading. The term "processor" may be understood to include single-core processors, multi-core processors, multiple processors within a device, and / or remote or "cloud" processors.

[0069] In some embodiments, processor 202a may be configured to execute instructions stored in memory 204a and / or circuitry otherwise accessible to processor 202a. In some embodiments, processor 202a may be configured to perform hard-coded functions. Thus, whether configured by hardware or software methods or a combination thereof, processor 202a may represent an entity (e.g., physically embodied in circuitry) capable of performing operations according to embodiments disclosed herein when configured accordingly. Alternatively, as another example, when processor 202a embodies an executor of software instructions, the instructions may specifically configure processor 202a to perform the algorithms and / or operations described herein when executing the instructions.

[0070] In some embodiments, device 200a may optionally include input / output circuitry that can communicate with processor 202a to provide output to a user and / or other entities, and in some embodiments, receive input indications. The input / output circuitry may include a user interface and may include a display, and may include a web user interface, mobile application, query-initiating computing device, kiosk, etc. In some embodiments, the input / output circuitry may also include a keyboard, mouse, joystick, touchscreen, touch area, softkeys, microphone, speaker, or other input / output mechanism. The processor and / or the user interface circuitry including the processor may be configured to control one or more functions of one or more user interface elements via computer program instructions (e.g., software and / or firmware) stored in processor-accessible memory (e.g., memory 204a, etc.).

[0071] Network interface 206a can be any component, such as a device or circuit embodied in hardware or a combination of hardware and software, configured to receive and / or transmit data from / to a network and / or any other device, circuit, or module communicating with device 200a. In this regard, network interface 206a may include, for example, network interfaces for enabling communication with wired or wireless communication networks, such as Application Functions (AF), Multicast and Broadcast Service Functions (MBSF), Multicast and Broadcast User Plane Functions (MB-UPF), and / or Multicast and Broadcast Session Management Functions (MB-SMEF). For example, network interface 206a may include one or more network interface cards, antennas, buses, switches, routers, modems, and supporting hardware and / or software, or any other device suitable for enabling communication via a network. Additionally or alternatively, network interface 206a may include circuitry that interacts with one or more antennas to induce signal transmission via said one or more antennas, or to process signals received via said one or more antennas.

[0072] Figure 3An example of a CSI-RS configuration 300 for LTM according to at least one example embodiment of the present disclosure is shown. In a first method of providing CSI-RS configuration to UE 110 in two parts, UE 110 may be configured to reference either a first part 301 (e.g., outside of a candidate cell configuration) or a second part 303 (e.g., CSI-RS resources within a candidate cell configuration). In some embodiments, configuration information of one or more CSI-RS resources, resource sets, resource configurations, etc. (e.g., each having a corresponding identifier) ​​of a candidate cell is provided to the UE for LTM measurements. In some embodiments, UE 110 is configured to anticipate that the measurement RS used for LTM CSI reporting may point to the CSI-RS provided for LTM measurements. Additionally, in some embodiments, configuration of one or more CSI-RS (e.g., each having a corresponding identifier) ​​of a candidate cell is provided to UE 110 under a candidate cell configuration (e.g., ServingCellConfig) that is used by UE 110 after handover to a candidate cell. In various embodiments, after a cell handover to a candidate cell, the UE 110 is configured to have a measurement RS for CSI reporting intended for serving cell procedures (e.g., intra-cell / inter-cell beam management, CSI acquisition, etc.) within the candidate cell that may point to a CSI-RS provided for LTM measurements or a CSI-RS provided under the candidate cell configuration (e.g., ServingCellConfig).

[0073] In one example, a configuration of one or more CSI-RSs for a candidate cell used for LTM measurements may be provided under an LTM candidate IE but outside of the candidate cell configuration associated with the candidate cell (e.g., ServingCellConfig). In another example, a configuration of CSI-RSs (e.g., each CSI-RS having a corresponding identifier) ​​for serving cell procedures (e.g., intra-cell / inter-cell beam management, CSI acquisition, etc.) within the candidate cell may be provided under a candidate cell configuration associated with the candidate cell (e.g., ServingCellConfig). In yet another example, UE 110 may be instructed to expect the LTM CSI resource configuration associated with the LTM CSI reporting configuration to be formed as an indexed list of CSI-RSs given for LTM measurements (under an LTM candidate IE outside of the candidate cell configuration (e.g., ServingCellConfig)). In yet another example, UE 110 may be instructed to expect that, after cell handover, the CSI resource configuration associated with the CSI reporting configuration used for serving cell procedures (e.g., intra-cell / inter-cell beam management, CSI acquisition, etc.) is formed as an index list pointing to the CSI-RS given for LTM measurements (under LTM candidate IEs outside of candidate cell configurations (e.g., ServingCellConfig)) or under candidate cell configurations (e.g., ServingCellConfig).

[0074] In some embodiments, the CSI reporting configuration or CSI resource configuration for serving cell procedures (e.g., intra-cell / inter-cell beam management, CSI acquisition, etc.) may further indicate whether to reference the CSI-RS given for LTM measurements (under an LTM candidate IE outside the candidate cell configuration (e.g., ServingCellConfig)) or to reference the CSI-RS given under the candidate cell configuration (e.g., ServingCellConfig). In some embodiments, the CSI-RS identifiers (at the resource configuration, resource set, or resource level) in the first part of the configuration (for LTM measurements under an LTM candidate IE outside the candidate cell configuration (e.g., ServingCellConfig)) and the second part of the configuration (for serving cell procedures given under the candidate cell configuration (e.g., ServingCellConfig)) may share the same ID space.

[0075] In some embodiments, if a CSI-RS, CSI resource set, or CSI resource configuration is given in the second part of the configuration candidate cell configuration (e.g., ServingCellConfig), and it has the same identifier as the identifier given in the first part of the configuration, then when applying the first configuration and the second configuration, UE 110 applies the configuration under the identifier listed in the second part of the configuration. Alternatively, in some embodiments, if a CSI-RS, CSI resource set, or CSI resource configuration is given in the second part of the configuration candidate cell configuration (e.g., ServingCellConfig), and it has the same identifier as the identifier given in the first part of the configuration, then when applying the first configuration and the second configuration, UE 110 applies the configuration under the identifier listed in the first part of the configuration. In some embodiments, network node 120 instructs UE 110 whether to apply the first part or the second part in the scenario where the same identifier is used.

[0076] In some embodiments, UE 110 may indicate to network node 120 the capability to configure CSI-RS in multiple parts (e.g., in a first part and a second part). For example, UE 110 may indicate to network node 120 the capability to support multi-part CSI-RS configuration (for LTM). In some embodiments, UE 110 indicates the capability based on the number of candidate cells that can support the operation. In some embodiments, the capability may be provided to each candidate distribution unit (DU) (e.g., via a serving central unit (CU)) to accordingly construct a reporting configuration and its association with a resource configuration. In some embodiments, in an inter-CU scenario, the serving CU may send the capability to a candidate CU, which may then forward it to each of its candidate DUs.

[0077] In some embodiments, a network node (e.g., a serving CU or serving DU) may configure UE 110 to perform operations such as LTM measurements using CSI-RS and serving cell measurements using CSI-RS after cell handover. For example, the execution of these operations may be as a candidate cell-specific configuration (e.g., per candidate cell configuration under an LTM candidate information element). In a decomposed architecture instance, the instruction to perform such operations may be signaled to UE 110 by each DU (e.g., via serving / candidate CU) that prepares and provides configurations during the preparation phase. In some embodiments, UE behavior that uses CSI-RS for LTM measurements also for serving cell measurements after cell handover may be predefined in a standard.

[0078] exist Figure 4An example of the first process is shown in signaling diagram 400. In this example, the RRC reconfiguration of the UE's candidate cell 140 (candidate DU (DU2)) is provided with NZP-CSI-RS 1, NZP-CSI-RS 4, NZP-CSI-RS 6 and corresponding configurations for LTM measurements, and then NZP-CSI-RS 2, NZP-CSI-RS 3, NZP-CSI-RS 5 and corresponding configurations are provided under the candidate cell configuration (e.g., under ServingCellConfig) (signal 401). Before cell handover, based on the LTM reporting configuration, UE 110 only considers the CSI-RS configured for LTM measurements for measurement and LTM CSI reporting (operations 403, signal 405, signal 407). After cell handover, when UE 110 moves to DU2 (e.g., candidate cell 140), UE 110 decodes the candidate cell configuration and, according to the CSI reporting configuration, considers the CSI-RS configured for LTM measurements and the CSI-RS given under the candidate cell configuration for measurements used in the serving cell procedure (Operation 409, Signal 411).

[0079] In the example scenario, UE 110 may receive one or more configurations from network node 120, the corresponding configurations including: i) a set of L1 measurement configurations for a first set of NZP-CSI-RS for candidate cells; and ii) candidate cell configurations for a second set of NZP-CSI-RS with candidate cells. UE 110 may generate a set of L1 measurements for the first set of NZP-CSI-RS based at least in part on this set of L1 measurement configurations. UE 110 may provide a report including the set of L1 measurements to the network node. UE 110 may perform a cell handover to candidate cells in response to a control message from the network node, wherein the control message is based at least in part on the report including the set of L1 measurements. UE 110 may generate a set of BM L1 measurements and / or CSI L1 measurements for the second set of NZP-CSI-RS and the first set of NZP-CSI-RS based at least in part on the set of candidate cell configurations and the set of L1 measurement configurations. UE 110 may provide the candidate cell with the set of BM or CSI L1 measurements so that the candidate cell performs BM or CSI adaptation at least in part based on the set of BM L1 measurements and / or CSI L1 measurements.

[0080] Figure 5An example CSI-RS configuration 500 for LTM is shown. In a second method of providing CSI-RS configuration to UE 110 in two parts, after UE 110 is handed over (or self-handover) to the target candidate cell, UE 110 combines the first and second parts of the configuration and applies the combined set of parts to the measurements used by serving cell operations (e.g., BM, CSI acquisition, etc.) on the target candidate cell.

[0081] For example, configuration information for one or more CSI-RS (e.g., each with a corresponding identifier) ​​for candidate cells can be provided to UE 110 for LTM measurements. In various embodiments, UE 110 is configured to expect measurement RSs for LTM CSI reporting to point to CSI-RSs provided for LTM measurements. In some embodiments, configuration of one or more CSI-RSs for candidate cells (e.g., each with a corresponding identifier) ​​is provided to UE 110 under a candidate cell configuration (e.g., ServingCellConfig), which is used by UE 110 after moving to a candidate cell. In some embodiments, after cell handover to a candidate cell, UE 110 merges or combines the set of CSI-RSs given for LTM measurements of the candidate cell with the set of CSI-RSs under the candidate cell configuration of the candidate cell into a combined set 505 of configured CSI-RSs. In some embodiments, UE 110 is configured to anticipate that the measurement RS for CSI reporting for serving cell procedures (e.g., intra-cell / inter-cell beam management, CSI acquisition, etc.) within a candidate cell may point to a CSI-RS from a combined set 505 of configured CSI-RS.

[0082] In some embodiments, one or more CSI-RS identifiers (e.g., at resource configuration, resource set, or resource level) in the first part 501 of the configuration (e.g., for LTM measurements under LTM candidate IEs other than candidate cell configurations (e.g., ServingCellConfig)) and the second part 503 of the configuration (for serving cell procedures given under candidate cell configurations (e.g., ServingCellConfig)) may share the same ID space. As an example, the CSI-RS, CSI resource set, or CSI resource configuration of both the first and second parts may be combined under the same ID space. In some embodiments, if a CSI-RS, CSI resource set, or CSI resource configuration is given in the second part 503 of the configuration candidate cell configuration (e.g., ServingCellConfig) and has the same identifier as the identifier given in the first part 501 of the configuration, then when the first configuration 501 and the second configuration 503 are combined, the UE 110 applies configuration 503 under the identifier listed in the second part 503 of the configuration. In other words, the candidate cell CSI-RS configuration of the second configuration 503 may override or replace the CSI configuration (identifier) ​​of the first configuration 501 when combined.

[0083] Alternatively, in some embodiments, if a CSI-RS or CSI resource set or CSI resource configuration is given in the second part 503 of the configuration candidate cell configuration (e.g., ServingCellConfig), and it has the same identifier as the identifier given in the first part 501 of the configuration, then when the first configuration 501 and the second configuration 503 are combined, the UE 110 applies the configuration under the identifier listed in the first part 501 of the configuration. In other words, the CSI configuration (identifier) ​​of the first configuration 501 can override or replace the CSI configuration (identifier) ​​of the candidate cell CSI-RS configuration when combined. In various embodiments, the UE 110 receives instructions (e.g., control messages, etc.) indicating which configuration to consider when the same identifier is used in the first part 501 and the second part 503.

[0084] In some embodiments, the second portion 503 of the configuration may include a reference to the first portion 501 of the configuration (e.g., a reference to an identifier of the first portion 501 of the configuration). This reference may be one of a CSI-RS resource identifier, a CSI-RS resource set identifier, a CSI-RS resource configuration identifier, etc. In some embodiments, the reference identifier in the second portion 503 of the configuration may not contain any parameters other than the resource identifier. When a reference identifier is given in the second portion 503 of the configuration, the corresponding parameters of the same identifier in the first portion 503 of the configuration can be applied to the combined configuration. In other words, when an RS identifier is given in the second portion 503, the corresponding parameters of the RS can be determined based on the configuration given in the first portion 503 associated with the same RS identifier.

[0085] In some embodiments, for a CSI-RS (or CSI resource set or CSI resource configuration) given for LTM measurements, network node 120 provides UE 110 with a one-bit explicit indication to indicate whether such a resource or resource set or configuration is acceptable for serving cell measurements after cell handover. In some embodiments, UE 110 will only combine CSI-RS indicated as usable for serving cell measurements after cell handover with CSI-RS in the candidate cell configuration. In some embodiments, for CSI-RS indicated as unusable for serving cell measurements after cell handover, UE 110 may not consider combining them with CSI-RS in the candidate cell configuration. In some embodiments, in an example of a decomposed architecture, each DU (e.g., candidate cell) that prepares and provides configuration during the preparation phase signals a one-bit indication.

[0086] In some embodiments, UE 110 indicates to network node 120 its capability to support: performing LTM measurements using CSI-RS, combining them with CSI-RS given in the candidate cell configuration, and performing serving cell measurements using the combined set of configured CSI-RS after cell handover. For example, the UE can indicate such capability based on the number of candidate cells that can support this operation. As another example, in a decomposed architecture instance, such capability can be transferred to each DU (e.g., via serving / candidate CU) that is prepared and provided during the preparation phase.

[0087] In some embodiments, network node 120 (e.g., serving CU or serving DU) may configure UE 110 to perform the following operations: perform LTM measurements using CSI-RS, combine them with CSI-RS given in the candidate cell configuration, and perform serving cell measurements using the combined set of configured CSI-RS after cell handover. For example, UE 110 may be configured to perform operations on a candidate cell-specific basis (e.g., per candidate cell configuration under LTM candidate information elements). As another example, in an example of a decomposed architecture, instructions for performing operations may be signaled to UE 110 by each DU (e.g., via serving / candidate CU) preparing and providing configurations during the preparation phase. In another example, UE behavior that uses CSI-RS for LTM measurements for serving cell measurements after cell handover may be predefined in the standard.

[0088] exist Figure 6 An example of the second method is shown in signaling diagram 600. In this example, the RRC reconfiguration of the UE's candidate cell 140 (candidate DU (DU2)) is provided with NZP-CSI-RS 1, NZP-CSI-RS 4, NZP-CSI-RS 6 and corresponding configurations for LTM measurements, and then NZP-CSI-RS 2, NZP-CSI-RS 3, NZP-CSI-RS 5 and corresponding configurations are provided under the candidate cell configuration (e.g., under ServingCellConfig) (signal 601). Before cell handover, based on the LTM reporting configuration, the UE 110 only considers the CSI-RS configured for LTM measurements for measurement and LTM CSI reporting (operations 603, signal 605, signal 607). After a cell handover, when UE 110 moves to DU2 (e.g., candidate cell 140), UE 110 decodes the candidate cell configuration and, based on the CSI reporting configuration, combines or merges the CSI-RS and the corresponding configurations for LTM measurements and cell configuration to determine the associated RS for measurements used in the serving cell procedure (Operation 609, Signal 611).

[0089] Now for reference Figure 7 This shows an example flowchart of the CSI-RS configuration signaling process 700. Process 700, or its blocks / steps / operations, can be defined as follows: Figure 2 The process 700 may be performed by one or more devices 200a, 200b shown and described herein. In various embodiments, the device performing the process 700 is a UE 110. In some embodiments, the network node associated with the execution of the process 700 is one or more devices 200b.

[0090] In some embodiments, at block 703, the apparatus for performing process 700 includes components such as processor 202a, memory 204a, network interface 206a, etc., for receiving one or more CSI-RS configurations for candidate cells from a network node. For example, apparatus 200a may receive one or more CSI-RS configurations for candidate cells from network node 120. In some embodiments, the corresponding CSI-RS configuration includes: i) a first set of CSI-RS configurations for performing Layer 1 (L1) measurements on candidate cells, and ii) a second set of CSI-RS configurations for candidate cell configurations associated with cell handover to candidate cells. In some embodiments, the corresponding set of CSI-RS configurations includes one or more CSI-RS resource configurations for the corresponding CSI-RS of a candidate cell. In some embodiments, the corresponding CSI-RS resource configuration indicates one or more NZP-CSI-RS resource sets for the corresponding CSI-RS of a candidate cell. In some embodiments, the network node is a gNodeB. In some embodiments, the candidate cell is a Low Layer Triggered Mobility (LTM) candidate cell.

[0091] In some embodiments, at block 706, the apparatus for performing process 700 optionally includes components such as processor 202a, memory 204a, network interface 206a, etc., for generating one or more L1 measurements for one or more CSI-RS for candidate cells, at least in part based on a first set of CSI-RS configurations. For example, apparatus 200a may generate one or more L1 measurements for one or more CSI-RS for candidate cells, at least in part based on a first set of CSI-RS configurations. In some embodiments, at block 709, the apparatus for performing process 700 optionally includes components such as processor 202a, memory 204a, network interface 206a, etc., for providing a report including one or more L1 measurements to network node 120. For example, apparatus 200a may provide a report including one or more L1 measurements to network node 120.

[0092] In some embodiments, at block 712, the means of executing process 700 includes components such as processor 202a, memory 204a, network interface 206a, etc., for performing a cell handover to a candidate cell in response to a control message from network node 120. In some embodiments, the control message is based at least in part on a report including one or more L1 measurements of one or more CSI-RS for the candidate cell. In some embodiments, the corresponding L1 measurements are generated based at least in part on a first set of CSI-RS configurations. In some embodiments, at block 715, the means of executing process 700 optionally includes components such as processor 202a, memory 204a, network interface 206a, etc., for decoding a second set of CSI-RS configurations in response to performing a cell handover to a candidate cell. For example, means 200a may decode the second set of CSI-RS configurations in association with performing a cell handover to a candidate cell.

[0093] In some embodiments, at block 718, the apparatus for performing process 700 includes components such as processor 202a, memory 204a, network interface 206a, etc., for determining a subset of CSI-RS for BM and / or CSI reporting on candidate cells, based at least in part on a first set and a second set of CSI-RS configurations. For example, apparatus 200a may determine a subset of CSI-RS for BM and / or CSI reporting on candidate cells, based at least in part on a first set and a second set of CSI-RS configurations. This determination may be embodied as follows: Figure 3 , 4 The first method shown in Figure 8 and described herein. Alternatively, this determination can be embodied as... Figure 5 , Figure 6 and Figure 9 The second method is shown and described herein.

[0094] In some embodiments, the candidate cell is the serving cell of the apparatus performing process 700 in association with cell handover. In some embodiments, at block 721, the apparatus performing process 700 optionally includes components such as processor 202a, memory 204a, network interface 206a, etc., for generating one or more BM L1 measurements and / or CSI L1 measurements for a determined subset of CSI-RS of the candidate cell. For example, apparatus 200a may generate one or more BM L1 measurements and / or CSI L1 measurements for a determined subset of CSI-RS of the candidate cell. In some embodiments, at block 724, the apparatus performing process 700 optionally includes components such as processor 202a, memory 204a, network interface 206a, etc., for providing a report to the candidate cell including one or more BM L1 measurements and / or CSI L1 measurements such that the candidate cell performs BM and / or CSI adaptation at least in part based on at least one BM and / or CSI L1 measurement.

[0095] Figure 8 An example flowchart of a CSI-RS configuration signaling procedure 800 is shown. In various embodiments, procedure 800 embodies... Figure 3 and 4 The CSI-RS configuration signaling provision method shown and described herein. Process 800 or its blocks / steps / operations can be provided by, for example... Figure 2 The process 800 may be performed by one or more devices 200a, 200b shown and described herein. In various embodiments, the device performing the process 800 is a UE 110. In some embodiments, the network node associated with the execution of the process 800 is one or more devices 200b.

[0096] In some embodiments, at block 803, the apparatus for performing process 800 optionally includes components such as processor 202a, memory 204a, network interface 206a, etc., for receiving instructions from network node 120 to apply one or more CSI-RS configurations for L1 measurements of the corresponding RS for candidate cells to generate one or more BM and / or CSI L1 measurements of candidate cells associated with cell handover. For example, apparatus 200a may receive instructions from network node 120 for applying one or more CSI-RS configurations for L1 measurements of the corresponding RS for candidate cells to generate one or more BM and / or CSI L1 measurements of candidate cells associated with cell handover. In some embodiments, the candidate cells are LTM candidate cells. In some embodiments, network node 120 is a gNodeB. In some embodiments, the apparatus for performing process 800 provides network node 1120 with a message indicating the capability to support multi-part CSI-RS configurations for BM and / or CSI reporting for candidate cells. In some embodiments, the message includes the number of candidate cells that can be supported for LTM. In some embodiments, providing a message to network node 120 causes network node 120 to provide a message to one or more candidate cells, such that the respective candidate cells generate one or more CSI-RS report configurations and corresponding associations between the CSI-RS report configurations and one or more CSI-RS resource configurations, at least in part, based on the message.

[0097] In some embodiments, at block 806, the apparatus for performing process 800 includes components such as processor 202a, memory 204a, network interface 206a, etc., for receiving one or more CSI-RS configurations for candidate cells from network node 120. For example, apparatus 200a may receive one or more CSI-RS configurations for candidate cells from network node 120. In some embodiments, a corresponding CSI-RS configuration includes one or more CSI-RS identifiers for a corresponding RS of a candidate cell and a corresponding CSI-RS configuration for L1 measurements of the corresponding RS of the candidate cell. In some embodiments, a corresponding CSI-RS configuration includes: a first set of identifiers for one or more CSI-RS, CSI resource sets, or CSI resource configuration sets associated with L1 measurements; and a second set of CSI-RS identifiers for one or more CSI-RS, CSI resource sets, or resource configuration sets associated with candidate cell configurations (for BM and / or CSI reporting) associated with cell handover.

[0098] In some embodiments, at block 809, the apparatus for performing process 800 optionally includes components such as processor 202a, memory 204a, network interface 206a, etc., for generating one or more L1 measurements for one or more CSI-RS for a candidate cell, at least in part, based on one or more CSI-RS configurations. For example, apparatus 200a may generate one or more L1 measurements for one or more CSI-RS for a candidate cell, at least in part, based on one or more CSI-RS configurations associated with a first set of identifiers. In some embodiments, a corresponding CSI-RS identifier in a second set of identifiers is matched with a corresponding CSI-RS in the first set of identifiers. In some embodiments, the second set of identifiers includes a set of configuration resources for the corresponding CSI-RS identifiers, wherein the CSI configuration resource set is associated with the configuration and cell handover of the candidate cell. In some embodiments, the apparatus for performing process 800 applies the configuration resource set of the second set to generate one or more L1 measurements for the corresponding CSI-RS for the candidate cell.

[0099] Alternatively, in some embodiments, the first set of identifiers includes a configuration resource set for a corresponding CSI-RS identifier, wherein the CSI configuration resource set is associated with an L1 measurement of the corresponding RS for the candidate cell. In at least some of these embodiments, the apparatus performing process 800 may apply the configuration resource set in the first set of identifiers to generate one or more L1 measurements for the corresponding CSI-RS for the candidate cell. In some embodiments, the corresponding CSI-RS configuration includes an indication of whether to apply the first set of CSI configuration resource sets or the second set of CSI configuration resource sets to generate the one or more L1 measurements for the corresponding CSI-RS for the candidate cell.

[0100] In some embodiments, at block 812, the means for performing process 800 includes components such as processor 202a, memory 204a, network interface 206a, etc., for providing a report to a network node including one or more L1 measurements.

[0101] In some embodiments, at block 815, the apparatus for performing process 800 includes components such as processor 202a, memory 204a, network interface 206a, etc., for performing cell handover to a candidate cell in response to a control message from a network node. For example, apparatus 200a may perform cell handover to a candidate cell in response to a control message from a network node. In some embodiments, the control message is based at least in part on a report including one or more L1 measurements of one or more CSI-RS for the candidate cell. In some embodiments, one or more L1 measurements are generated at least in part based on one or more CSI-RS configurations.

[0102] In some embodiments, at block 818, the apparatus for performing process 800 optionally includes components such as processor 202a, memory 204a, network interface 206a, etc., for determining a subset of CSI-RS for candidate cells for BM and / or CSI reporting, based at least in part on one or more CSI-RS identifiers and corresponding CSI-RS configurations for L1 measurements of the corresponding RSs for candidate cells. For example, apparatus 200a may determine a subset of CSI-RS for candidate cells for BM and / or CSI reporting, based at least in part on one or more CSI-RS identifiers and corresponding CSI-RS configurations for L1 measurements of the corresponding RSs for candidate cells.

[0103] In some embodiments, at block 821, the apparatus for performing process 800 optionally includes components (e.g., processor 202a, memory 204a, network interface 206a, etc.) that, in association with cell handover to a candidate cell, determine at least in part based on one or more CSI-RS configurations, wherein the set of indexes includes the indexes of the corresponding CSI-RS of the corresponding RS of the candidate cell. For example, apparatus 200a may determine the set of indexes of CSI-RS of the candidate cell at least in part based on one or more CSI-RS configurations, wherein the set of indexes includes the indexes of the corresponding CSI-RS of the corresponding RS of the candidate cell. In some embodiments, the apparatus for performing process 800 receives report configuration messages, resource configuration messages, etc., from network node 120. In some embodiments, the report configuration message or resource configuration message includes an indication that references one or more CSI-RS configurations for L1 measurement to determine the set of indexes of CSI-RS of the candidate cell, which is used for BM and / or CSI reporting of the candidate cell.

[0104] In some embodiments, at block 824, the apparatus for executing process 800 optionally includes components (e.g., processor 202a, memory 204a, network interface 206a, etc.) that generate one or more BM L1 measurements, CSI L1 measurements, etc., for a subset of the candidate cells' CSI-RS, based at least in part on the set of indexes of the candidate cells' CSI-RS. For example, apparatus 200a may generate one or more BM L1 measurements, CSI L1 measurements, etc., for a subset of the candidate cells' CSI-RS, based at least in part on the set of indexes of the candidate cells' CSI-RS. In some embodiments, at block 827, the apparatus for executing process 800 optionally includes components (e.g., processor 202a, memory 204a, network interface 206a, etc.) that provide a report to the candidate cells including one or more BM L1 measurements, CSI L1 measurements, etc., so that the candidate cells perform BM or CSI adaptation at least in part on the one or more BM L1 measurements, CSI L1 measurements, etc.

[0105] Figure 9 This is an example flowchart of a CSI-RS configuration signaling procedure according to at least one example embodiment of the present disclosure. In various embodiments, procedure 900 embodies... Figure 6 and 7 The CSI-RS configuration signaling provision method shown and described herein. Process 900 or its blocks / steps / operations can be provided by, for example... Figure 2 The process 900 may be performed by one or more devices 200a, 200b shown and described herein. In various embodiments, the device performing the process 900 is a UE 110. In some embodiments, the network node associated with the execution of the process 900 is one or more devices 200b.

[0106] In some embodiments, at block 903, the apparatus for performing process 900 may optionally include components such as processor 202a, memory 204a, network interface 206a, etc., for receiving a configuration indication including a bit field associated with one or more CSI-RSs of the candidate cell. For example, apparatus 200a may receive the configuration indication including a bit field associated with one or more CSI-RSs of the candidate cell from the candidate cell (or other elements of network node 120). In some embodiments, the bit field may be configured between a first value and a second value (e.g., 0 and 1). In some embodiments, in the second value, the bit field indicates that the corresponding CSI-RS configuration for L1 measurement in the one or more CSI-RS configurations for L1 measurement is applied to BM and / or CSI reporting on the candidate cell. In some embodiments, in the first value, the bit field indicates that the corresponding CSI-RS configuration for L1 measurement in the one or more CSI-RS configurations for L1 measurement is not applied to BM and / or CSI reporting on the candidate cell.

[0107] Additionally or alternatively, in some embodiments, the apparatus executing process 900 optionally receives a configuration message including instructions for association with the execution of cell handover, i) generating a set of combinations of configured CSI-RS based at least in part on one or more CSI-RS identifiers of a first portion of a corresponding CSI-RS configuration and one or more CSI-RS identifiers of a second portion of a corresponding CSI-RS configuration, and ii) using the set of combinations of configured CSI-RS in L1 measurements in BM and / or CSI reporting of candidate cells. The apparatus executing process 900 may receive the configuration message from a network node, one or more candidate cells, etc.

[0108] In some embodiments, the apparatus performing process 900 optionally provides a configuration message to network nodes, candidate cells, etc., indicating the ability to generate a combined set of configured CSI-RS based at least in part on a first portion (e.g., an L1 measurement portion) of one or more CSI-RS configurations. For example, the configuration message may indicate the ability of apparatus 200a to generate a combined set of configured CSI-RS based on one or more CSI-RS identifiers of candidate cells, wherein the one or more CSI-RS identifiers are provided in a first portion of the CSI-RS configuration. In some embodiments, the configuration message includes the number of supportable candidate cells that can be generated from the corresponding combined set of configured CSI-RS.

[0109] In some embodiments, at block 906, the apparatus executing process 900 optionally includes components for receiving instructions from network node 120, such as processor 202a, memory 204a, network interface 206a, etc., indicating whether to prioritize the CSI-RS configuration for L1 measurement or the candidate cell configuration if a corresponding CSI-RS identifier in a first part of the CSI-RS configuration (e.g., the L1 measurement part) matches a corresponding CSI-RS identifier in a second part of the CSI-RS configuration (e.g., the cell configuration part). For example, apparatus 200a may receive instructions from network node 120. In some embodiments, based at least in part on the instructions, the apparatus executing process 200a determines to prioritize i) one or more CSI-RS configurations from the first part, or ii) a corresponding CSI-RS configuration from the second part, to determine a subset of CSI-RS for BM and / or CSI reporting for candidate cells.

[0110] In some embodiments, at block 909, the apparatus for performing process 900 includes components such as processor 202a, memory 204a, network interface 206a, etc., for receiving one or more CSI-RS configurations for candidate cells from network node 120. For example, apparatus 200a may receive one or more CSI-RS configurations for candidate cells from network node 120. In some embodiments, a corresponding CSI-RS configuration includes a first portion and a second portion. In some embodiments, the first portion includes one or more CSI-RS identifiers for a corresponding RS of a candidate cell and one or more CSI-RS configurations for L1 measurements of the corresponding RS of the candidate cell. In some embodiments, the second portion includes one or more CSI-RS identifiers for a corresponding RS of a candidate cell and corresponding CSI-RS configurations for one or more RSs of a candidate cell, which are used for BM and / or CSI reporting (also referred to herein as CSI acquisition).

[0111] In some embodiments, at block 912, the apparatus for performing process 900 optionally includes components such as processor 202a, memory 204a, network interface 206a, etc., for generating one or more L1 measurements for a candidate cell's corresponding CSI-RS based at least in part on one or more CSI-RS configurations (e.g., a first portion) for L1 measurements of the corresponding RS. For example, apparatus 200a may generate one or more L1 measurements for a candidate cell's corresponding CSI-RS based at least in part on one or more CSI-RS configurations for L1 measurements of the corresponding RS. In some embodiments, at block 915, the apparatus for performing process 900 optionally includes components such as processor 202a, memory 204a, network interface 206a, etc., for providing a report to network node 120 including one or more L1 measurements. For example, apparatus 200a may provide a report to network node 120 including one or more L1 measurements.

[0112] In some embodiments, at block 918, the apparatus for performing process 900 includes components such as processor 202a, memory 204a, network interface 206a, etc., for performing cell handover to a candidate cell in response to a control message from network node 120. For example, apparatus 200a may perform cell handover to a candidate cell in response to a control message from network node 120. In some embodiments, the control message is based at least in part on a report including one or more L1 measurements of the corresponding CSI-RS for the candidate cell. In some embodiments, the one or more L1 measurements of the corresponding CSI-RS for the candidate cell are generated at least in part based on a configuration of one or more CSI-RS for L1 measurements of the corresponding RS.

[0113] In some embodiments, at block 921, the apparatus for performing process 900 includes components such as processor 202a, memory 204a, network interface 206a, etc., for generating a combined set of configured CSI-RS based at least in part on one or more CSI-RS identifiers of a first portion of one or more CSI-RS configurations of operation 909 and one or more CSI-RS identifiers of a second portion of the CSI-RS configurations. For example, apparatus 200a may generate a combined set of configured CSI-RS based at least in part on one or more CSI-RS identifiers of the first portion and one or more CSI-RS identifiers of the second portion. In some embodiments, the corresponding CSI-RS identifier of the second portion embodies a reference to the corresponding CSI-RS identifier of the first portion. Based at least in part on the reference embodied by the corresponding CSI-RS identifier, the apparatus for performing process 900 may determine a corresponding CSI-RS configuration from the first portion among one or more CSI-RS configurations for L1 measurement, enabling the corresponding CSI-RS configuration to be used for BM and / or CSI reporting.

[0114] In some embodiments, at block 924, the apparatus for performing process 900 includes components such as processor 202a, memory 204a, network interface 206a, etc., for determining a subset of CSI-RS for candidate cells for BM and / or CSI reporting based at least in part on a combined set of CSI-RS and the corresponding CSI-RS configuration for BM and / or CSI reporting in the second part. For example, apparatus 200a may determine a subset of CSI-RS for candidate cells for BM and / or CSI reporting based at least in part on a combined set of CSI-RS and the corresponding CSI-RS configuration for BM and / or CSI reporting.

[0115] In some embodiments, the apparatus performing process 900 determines a subset of CSI-RS for BM and / or CSI reporting based at least in part on one or more instructions, pre-configuration criteria, etc. For example, the corresponding CSI-RS identifier of the first portion may be matched with the corresponding CSI-RS identifier of the second portion. In this case, apparatus 200a may prioritize the corresponding CSI-RS configuration from the second portion over the CSI-RS configuration associated with the identifier from the first portion when determining a subset of CSI-RS for candidate cells for BM and / or CSI reporting. Alternatively, apparatus 200a may prioritize the CSI-RS configuration associated with the identifier from the first portion over the corresponding CSI-RS configuration from the second portion when determining a subset of CSI-RS for candidate cells for BM and / or CSI reporting. As described herein with reference to operation 906, the apparatus performing process 900 may receive instructions for prioritization from network node 120, candidate cells, etc.

[0116] Additionally or alternatively, the apparatus of process 900 may determine a subset of the CSI-RS for candidate cells for BM and / or CSI reporting based at least in part on the corresponding CSI-RS configuration for L1 measurements. As described herein with reference to operation 903, the apparatus of process 900 may receive a configuration indication (e.g., a bit field configurable between a first value and a second value) indicating whether the corresponding CSI-RS configuration for L1 measurements is applied to BM and / or CSI reporting on candidate cells.

[0117] In some embodiments, at block 927, the apparatus for performing process 900 optionally includes components such as processor 202a, memory 204a, network interface 206a, etc., for generating one or more BM measurements, CSI L1 measurements, etc., for a determined subset of CSI-RS of candidate cells. For example, apparatus 200a may generate one or more BM measurements, CSI L1 measurements, etc., for a determined subset of CSI-RS of candidate cells. In some embodiments, at block 930, the apparatus for performing process 900 optionally includes components such as processor 202a, memory 204a, network interface 206a, etc., for providing a report to candidate cells including one or more BM measurements, CSI L1 measurements, etc., so that candidate cells perform BM or CSI adaptation at least in part based on one or more BM L1 measurements, CSI L1 measurements, etc.

[0118] In various embodiments, the methods, apparatus, and computer program products of this disclosure are provided for providing a CSI-RS configuration for L1 measurement and candidate cell configuration to a UE. The methods, apparatus, and computer program products provide an improved solution for providing CSI-RS configuration with reduced overhead. In various embodiments, the methods, apparatus, and computer program products are a multi-part framework for providing CSI-RS configuration for candidate cells, such that when the CSI-RS configuration for candidate cells is divided into two parts as described above, the reporting configuration for beam management after cell handover can reference resource configurations maintained outside the candidate configuration (e.g., within the L1 measurement configuration). In various embodiments, the methods, apparatus, and computer program products improve telecommunications services by overcoming the technical challenges associated with implementing CSI-RS-based LTM, including the additional overhead in providing the CSI-RS configuration for L1 measurement and cell configuration to the UE.

[0119] It should be understood that each block and combination of blocks in the flowcharts shown in the accompanying drawings and described herein can be implemented by various means, such as hardware, firmware, processors, circuitry, and / or communication devices associated with the execution of software including one or more program instructions. For example, one or more of the processes or operations described above can be embodied by computer program instructions. In this regard, computer program instructions embodying the processes or operations described above can be stored in memory 204a or memory 204b of a device (e.g., a UE or network node employing the disclosed embodiments and executed by processor 202a or processor 202b). As will be understood, any such computer program instructions can be loaded onto a computer or other programmable device (e.g., hardware) to produce a machine that causes the resulting computer or other programmable device to perform the functions specified in the flowchart blocks. These computer program instructions can also be stored in a computer-readable storage medium that can instruct a computer or other programmable device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of art whose execution performs the functions specified in the flowchart blocks. Computer program instructions may also be loaded onto a computer or other programmable device to cause a series of operations to be performed on the computer or other programmable device to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable device, provide operations for implementing the function specified in the flowchart box.

[0120] Benefiting from the teachings presented in the foregoing description and associated drawings, those skilled in the art to which these embodiments pertain will conceive of numerous modifications and other embodiments of the present disclosure set forth herein. Therefore, it should be understood that the present disclosure is not limited to the specific embodiments disclosed, and that modifications and other embodiments are intended to be included within the scope of the appended claims. Furthermore, although the foregoing description and associated drawings describe exemplary embodiments in the context of certain example combinations of elements and / or functions, it should be understood that different combinations of elements and / or functions may be provided by alternative embodiments without departing from the scope of the appended claims. In this regard, for example, combinations of elements and / or functions different from those explicitly described above are also contemplated as being set forth in some of the appended claims. Although specific terminology is used herein, it is used only in a general and descriptive sense and not for limiting purposes.

Claims

1. An apparatus comprising: At least one processor; as well as At least one memory, the at least one memory storing instructions that, when executed by the at least one processor, cause the device to at least: Receive at least one Channel State Information Reference Signal (CSI-RS) configuration for candidate cells from a network node, the at least one CSI-RS configuration including: Part One includes: At least one CSI-RS identifier for the corresponding RS of the candidate cell; and At least one CSI-RS configuration for the Layer 1 (L1) measurement of the corresponding RS for the candidate cell; and Part Two includes: At least one CSI-RS identifier for the second corresponding RS of the candidate cell; and The corresponding CSI-RS configuration of at least one RS of the candidate cell for at least one of beam management (BM) or CSI reporting; In response to a control message from the network node, a cell handover to the candidate cell is performed, wherein: The control message is based at least in part on a report including at least one L1 measurement of the corresponding CSI-RS for the candidate cell; and The at least one L1 measurement for the corresponding CSI-RS of the candidate cell is generated at least in part based on the at least one CSI-RS configuration for the L1 measurement of the corresponding RS in the first part; A combined set of configuration CSI-RS is generated, at least in part, based on the at least one CSI-RS identifier of the first part and the at least one CSI-RS identifier of the second part; and A subset of CSI-RS for at least one of BM or CSI reporting for the candidate cells is determined based at least in part on the following: The combined set of CSI-RS; and The corresponding CSI-RS configuration used for at least one of BM or CSI reporting.

2. The apparatus of claim 1, wherein the instructions, when executed by the at least one processor, further cause the apparatus to: The at least one L1 measurement for the corresponding CSI-RS of the candidate cell is generated, at least in part, based on the at least one CSI-RS configuration for the L1 measurement of the corresponding RS in the first part; and The report, which includes the at least one L1 measurement, is provided to the network node.

3. The apparatus according to claim 1, wherein: The corresponding CSI-RS identifier of the at least one CSI-RS identifier in the first part matches the corresponding CSI-RS identifier of the at least one CSI-RS identifier in the second part; and The instructions, when executed by the at least one processor, also cause the device to: When determining the subset of CSI-RS for at least one of BM or CSI reporting for the candidate cell, the corresponding CSI-RS configuration from the second part is preferred over the at least one CSI-RS configuration from the first part.

4. The apparatus according to claim 1, wherein: The corresponding CSI-RS identifier of the at least one CSI-RS identifier in the first part matches the corresponding CSI-RS identifier of the at least one CSI-RS identifier in the second part; and The instructions, when executed by the at least one processor, also cause the device to: When determining the subset of CSI-RS for at least one of BM or CSI reporting for the candidate cell, the at least one CSI-RS configuration from the first portion is prioritized in place of the corresponding CSI-RS configuration from the second portion.

5. The apparatus according to claim 1, wherein: The corresponding CSI-RS identifier of the at least one CSI-RS identifier in the first part matches the corresponding CSI-RS identifier of the at least one CSI-RS identifier in the second part; and The instructions, when executed by the at least one processor, also cause the device to: Receive instructions from the network node; as well as Based at least in part on the instructions, when determining the subset of CSI-RS for at least one of BM or CSI reporting for the candidate cell, it is determined whether to prioritize i) the at least one CSI-RS configuration from the first portion or ii) the corresponding CSI-RS configuration from the second portion.

6. The apparatus according to claim 1, wherein: The corresponding CSI-RS identifier of the at least one CSI-RS identifier in the second part reflects a reference to the corresponding CSI-RS identifier of the at least one CSI-RS identifier in the first part; and The instructions, when executed by the at least one processor, also cause the device to: Based at least in part on the reference embodied by the corresponding CSI-RS identifier, the corresponding CSI-RS configuration in the at least one CSI-RS configuration for L1 measurement is determined from the first portion, so that the corresponding CSI-RS configuration can be used for at least one of BM or CSI reporting.

7. The apparatus of claim 1, wherein the instructions, when executed by the at least one processor, further cause the apparatus to: Receive a configuration indication including a bit field associated with at least one CSI-RS of the candidate cell, wherein: The bit field can be configured between a first value and a second value; and In the second value, the bit field indicates that the corresponding CSI-RS configuration for L1 measurement in the at least one CSI-RS configuration for L1 measurement is applied to at least one of the BM or CSI reporting on the candidate cell; and The subset of CSI-RS for at least one of BM or CSI reporting for the candidate cell is determined at least in part based on the corresponding CSI-RS configuration for L1 measurement.

8. The apparatus according to claim 7, wherein: The configuration instruction is received from the candidate cell.

9. The apparatus of claim 1, wherein the instructions, when executed by the at least one processor, further cause the apparatus to: A configuration message is provided to the network node, the configuration message indicating the ability to generate the combined set of CSI-RS configurations based at least in part on the following: The corresponding one of the at least one CSI-RS identifiers for the corresponding RS of the candidate cell; and The corresponding one of the at least one CSI-RS configurations used for the L1 measurement of the corresponding RS for the candidate cell.

10. The apparatus of claim 1, wherein the instructions, when executed by the at least one processor, further cause the apparatus to: A configuration message is provided to the candidate cells, the configuration message indicating the ability to generate the combined set of CSI-RS configurations based at least in part on the following: The corresponding one of the at least one CSI-RS identifiers for the corresponding RS of the candidate cell; and The corresponding one of the at least one CSI-RS configurations used for the L1 measurement of the corresponding RS for the candidate cell.

11. The apparatus according to claim 9 or 10, wherein: The configuration message includes the configuration of the corresponding combination set of CSI-RS for the number of candidate cells that can be supported by it.

12. The apparatus of claim 1, wherein the instructions, when executed by the at least one processor, further cause the apparatus to: A configuration message is received, the configuration message including instructions for performing the following operations in association with the execution of the cell handover: i) generating the combined set of configured CSI-RS based at least in part on the at least one CSI-RS identifier of the first part and the at least one CSI-RS identifier of the second part, and ii) using the combined set of configured CSI-RS in at least one of L1 measurement for the candidate cell and BM or CSI reporting.

13. The apparatus according to claim 12, wherein: The configuration message is received from the network node.

14. The apparatus according to claim 12, wherein: The configuration message is received from the candidate cell.

15. The apparatus according to any one of claims 1 to 14, wherein: The candidate cells are low-layer triggered mobility (LTM) candidate cells.

16. The apparatus according to any one of claims 1 to 15, wherein: The network node is gNodeB.

17. The apparatus according to any one of claims 1 to 16, wherein: The device is a user equipment (UE).

18. A method according to any one of claims 1 to 17.

19. An apparatus comprising components for performing the method according to claim 17.

20. A computer program product comprising at least one non-transitory computer-readable storage medium storing computer-executable program code instructions, the computer-executable program code instructions including program code instructions configured to perform the method of claim 17.

21. An apparatus comprising: At least one processor; as well as At least one memory, the at least one memory storing instructions that, when executed by the at least one processor, cause the device to at least: Provide the UE with at least one Channel State Information Reference Signal (CSI-RS) configuration for candidate cells, the at least one CSI-RS configuration including: Part One includes: At least one CSI-RS identifier for the corresponding RS of the candidate cell; and At least one CSI-RS configuration for the Layer 1 (L1) measurement of the corresponding RS for the candidate cell; and Part Two includes: At least one CSI-RS identifier for the second corresponding RS of the candidate cell; and The corresponding CSI-RS configuration of at least one RS of the candidate cell for at least one of beam management (BM) or CSI reporting; The UE receives a report including at least one L1 measurement of the corresponding CSI-RS for the candidate cell, wherein the at least one L1 measurement of the corresponding CSI-RS for the candidate cell is generated at least in part based on the at least one CSI-RS configuration for the L1 measurement of the corresponding RS in the first part; A control message is provided to the UE to cause the UE to perform the cell handover to the candidate cell, and in connection with the execution on the candidate cell: A combined set of configuration CSI-RS is generated, at least in part, based on the at least one CSI-RS identifier of the first part and the at least one CSI-RS identifier of the second part; and A subset of CSI-RS for at least one of BM or CSI reporting for the candidate cells is determined based at least in part on the following: The combined set of CSI-RS; and The corresponding CSI-RS configuration used for at least one of BM or CSI reporting.

22. The apparatus according to claim 21, wherein: The corresponding CSI-RS identifier of the at least one CSI-RS identifier in the first part matches the corresponding CSI-RS identifier of the at least one CSI-RS identifier in the second part; and The instructions, when executed by the at least one processor, also cause the device to: When determining the subset of CSI-RS for at least one of BM or CSI reporting for the candidate cell, the corresponding CSI-RS configuration from the second part is preferred over the at least one CSI-RS configuration from the first part.

23. The apparatus according to claim 21, wherein: The corresponding CSI-RS identifier of the at least one CSI-RS identifier in the first part matches the corresponding CSI-RS identifier of the at least one CSI-RS identifier in the second part; and The instructions, when executed by the at least one processor, also cause the device to: The UE is provided with an instruction indicating whether, when determining the subset of CSI-RS for at least one of BM or CSI reporting of the candidate cell, i) the at least one CSI-RS configuration from the first portion or ii) the corresponding CSI-RS configuration from the second portion is prioritized.

24. The apparatus according to claim 21, wherein: The instructions, when executed by the at least one processor, also cause the device to: Provide the UE with a configuration indication including a bit field associated with at least one CSI-RS of the candidate cell, wherein: The bit field can be configured between a first value and a second value; and In the second value, the bit field indicates that the corresponding CSI-RS configuration for L1 measurement in the at least one CSI-RS configuration for L1 measurement is applied to at least one of the BM or CSI reporting on the candidate cell.

25. The apparatus of claim 21, wherein the instructions, when executed by the at least one processor, further cause the apparatus to: The UE receives a configuration message indicating the ability to generate the combined set of CSI-RS configurations based at least in part on the following: The corresponding one of the at least one CSI-RS identifiers for the corresponding RS of the candidate cell; and The corresponding one of the at least one CSI-RS configurations used for the L1 measurement of the corresponding RS for the candidate cell.

26. The apparatus according to claim 25, wherein: The configuration message includes the configuration of the corresponding combination set of CSI-RS for the number of candidate cells that can be supported by it.

27. The apparatus of claim 21, wherein the instructions, when executed by the at least one processor, further cause the apparatus to: A configuration message is provided to the UE, the configuration message including instructions for performing the following operations in connection with the execution of the cell handover: i) generating the combined set of configured CSI-RS based at least in part on the at least one CSI-RS identifier of the first part and the at least one CSI-RS identifier of the second part, and ii) using the combined set of configured CSI-RS in at least one of L1 measurement for the candidate cell and BM or CSI reporting.

28. The apparatus according to any one of claims 21 to 27, wherein: The candidate cells are low-layer triggered mobility (LTM) candidate cells.

29. The apparatus according to any one of claims 21 to 28, wherein: The device is gNodeB.

30. A method according to any one of claims 21 to 29.

31. An apparatus comprising components for performing the method according to claim 30.

32. A computer program product comprising at least one non-transitory computer-readable storage medium storing computer-executable program code instructions, the computer-executable program code instructions including program code instructions configured to perform the method of claim 30.

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