LTM reporting

Abstract

Methods, systems, and devices are disclosed. A wireless device is provided that is configured to receive a Layer 1 / Layer 2 triggered Mobility (LTM) measurement configuration from a network node. Each LTM measurement configuration is associated with an LTM candidate cell configuration index. The wireless device is further configured to perform at least one LTM measurement for each LTM candidate cell configuration indicated by the LTM candidate cell configuration index according to the LTM measurement configuration, and transmit an LTM measurement report to the network node. The LTM measurement report includes at least one LTM measurement of the LTM candidate cell configuration.

Description

Technical Field

[0001] This disclosure relates to wireless communication, and more particularly to the configuration of mobility (LTM) measurement reports triggered by Open Systems Interconnection (OSI) Layer 1 / Layer 2 (L1 / L2). Background Technology

[0002] The 3rd Generation Partnership Project (3GPP) has developed and is developing standards for fourth-generation (4G) (also known as Long Term Evolution (LTE)) and fifth-generation (5G) (also known as New Radio (NR)) wireless communication systems. Among other features, these systems provide broadband communication between network nodes (such as base stations) and mobile wireless devices (WDs), as well as communication between network nodes and between WDs. 3GPP is also developing standards for sixth-generation (6G) wireless communication networks.

[0003] In 3GPP Release 18 (3GPP Rel-18), particularly in the technical area of ​​inter-cell mobility based on Layer 1 / Layer 2 (L1 / L2), 3GPP has agreed on a work item (WI) regarding further New Radio (NR) mobility enhancements. See the WI description (e.g., WID in RP-213565). According to the WID, when a radio device (WD) (e.g., UE) moves from the coverage area of ​​one cell to another, a serving cell change needs to be performed at some point. In some existing systems, serving cell changes can be triggered by OSI Layer 3 (L3) measurements and can be performed via synchronized reconfiguration triggered by RRC signaling to change the primary cell (PCell) and primary secondary cell (PSCell), and, where applicable, release or add secondary cells (SCells). These cases involve a full L2 (and L1) reset, resulting in longer latency, greater overhead, and longer downtime than beam-switching mobility. The goal of L1 / L2 mobility enhancement is to enable serving cell changes via L1 / L2 signaling in order to reduce latency, overhead, and downtime.

[0004] If possible, L1-L2 inter-cell mobility should resemble inter-cell beam management; that is, to support L1-L2 inter-cell mobility, the WD can be configured to perform measurements on cells that are not serving cells as defined up to 3GPP Rel-17. In 3GPP Rel-17, to support Physical Inter-Cell Identifier (PCI) Multiple Transmit and Receive Point (mTRP) operation, a solution has been standardized where Channel State Information (CSI) resources can be associated with the same PCI that is not one of the serving cells. This solution also requires the WD to receive explicit instructions on which beams (Synchronization Signal Blocks (SSBs)) and PCIs to measure for a given reporting configuration.

[0005] The current standardization efforts aim to define the mechanisms and processes for L1 / L2-based inter-cell mobility for mobility latency reduction, including, for example: • Configuring and maintaining multiple candidate cells to allow for the rapid application of candidate cell configurations; • Dynamic handover mechanism in candidate serving cells (including SpCell and SCell) for potential applicable scenarios based on L1 / L2 signaling; • L1 enhancements for inter-cell beam management, including L1 measurement and reporting, and beam indication: Note 1: Early involvement is expected, including further clarification of the potential interaction between this point and the previous point; • Scheduled advance management; • Support for L1 / L2 mobility central unit-distributed unit (CU-DU) interface signaling, if required.

[0006] Note 2: FR2-specific enhancements (if any) are not excluded.

[0007] Note 3: The process based on L1 / L2 inter-cell mobility is applicable to the following scenarios: • Independent, carrier aggregation (CA) and NR-dual connectivity (DC) scenarios, where serving cell changes occur within a single carrier group (CG); • DU intra-DU and CU intra-DU inter-DU scenarios (applicable to standalone and CA: no new RAN interfaces expected); Both within and between frequencies; Both FR1 and FR2; and • The source cell and the target cell can be synchronized or asynchronous.

[0008] CSI Report In the NR, the WD measures and reports Channel State Information (CSI) to the Network (NW). The NW uses CSI reports to perform tasks such as link adaptation and beam selection. These measurement reports are examples of Uplink Control Information (UCI). UCI is carried in the Physical Uplink Control Channel (PUCCH) or the Physical Uplink Shared Channel (PUSCH).

[0009] For example, in the Radio Resource Control (RRC) Information Element (IE) CSI-ReportConfig, some CSI report configurations are configured for the WD. A CSI report configuration describes how the WD should generate a given CSI report. It links to one or more CSI resource configurations, which describe how the WD should perform measurements for the report.

[0010] Among other things, the CSI report configuration describes what quantities the WD should include in the CSI report. The different CSI report quantities from the WD to the network are as follows: • CRI (CSI-RS Resource Indicator). If the configured measurement includes a set of CSI-RS resources, the CRI is used to select the preferred CSI-RS resources for the channel measurement; • RI (Rank Indicator) represents the recommended number of Physical Downlink Shared Channel (PDSCH) layers calculated assuming the selected CRI; • PMI (Precoding Matrix Information) is used to specify the recommended precoding matrix; •CQI (Channel Quality Information) is a 4-bit value that specifies the recommended modulation scheme and code rate assuming the selected PMI, RI, and CRI. • The SSBRI (SSB Indicator) is similar to the CRI, but instead specifies which SSB the accompanying CSI report is valid for. This is a broadband quantity, and reports used for beam management can contain up to four SSBRIs. • Assuming the selected CQI, PMI, RI, and CRI, LI (layer indicator) in the case of RI>1 indicates the strongest layer of the selected precoding matrix, i.e., the column. • The L1 reference signal received power (RSRP) carries a single or multiple RSRP measurement. For a single L1-RSRP, a 7-bit value is used, with a range of [-140, -44] dBm and a 1 dB step.

[0011] CRI, RI, SSBRI, L1-RSRP, and LI are broadband quantities, meaning that a single value is reported for the entire bandwidth of the reference signal. PMI and CQI can be reported by subband: the bandwidth of the reference signal is divided into multiple non-overlapping subbands, and a value is reported for each subband.

[0012] The measurement reference signal (RS) can be, for example, CSI-RS, SSB, etc.

[0013] In some cases, CSI reports consist of two parts. Figure 1 This is a simplified diagram illustrating a sample CSI report split into two parts, where the size of the second part depends on the content of the first part. Part 1 has a fixed payload size and is used to identify the number of bits of information in Part 2. For example, Part 1 may include an RI and a CQI value. If RI > 4, a second CQI value is included in Part 2. This reduces the size of the CSI report.

[0014] Therefore, the existing system lacks one or more configurations to support LTM measurement reports. Summary of the Invention

[0015] Many details regarding L1 / L2 triggered mobility (LTM) are yet to be specified in 3GPP. This includes details of the procedures and messages used for lower-layer measurement reports and LTM cell handover. One unresolved issue is that existing systems may lack the configuration for network nodes to determine which LTM candidate cell is likely to trigger a subsequent LTM cell handover based on the content of the received measurement report when the WD transmits a lower-layer (L1) measurement report containing measurements of one or more LTM candidate cells to the network (e.g., to network nodes such as gNBs). More specifically, in a RAN distributed architecture with a central unit (CU) and distributed units (DUs), the serving DU receiving the measurement report may not control the LTM candidate cells used for a given measurement included in the report, as LTM candidate cells may be controlled by different network nodes (e.g., by different DUs). Furthermore, in existing systems, if the measurement in the received report indicates a beam that the WD has already measured, the serving DU may not be aware of the beam configuration of the LTM candidate cell when it is controlled by different network nodes (e.g., by different DUs).

[0016] Some embodiments advantageously provide methods, systems, and apparatus for configuring LTM measurement reports.

[0017] Embodiments of this disclosure address one or more of the aforementioned disadvantages of existing systems by providing configurations and methods for a WD, such as a UE, to perform LTM measurement reporting. For example, in some embodiments, a method for a wireless device is provided, the method comprising: receiving from a network node an LTM measurement configuration including a measurement configuration and an indication of LTM candidate configurations; performing a measurement based on the received LTM measurement configuration; and transmitting an LTM measurement report to the network node, including the LTM measurement and the indication of the LTM candidate configurations.

[0018] Embodiments of this disclosure may also provide configurations and methods for service network nodes, such as service DUs, to handle LTM measurement reports from WDs. For example, in some embodiments, a method is provided that includes receiving an LTM measurement report from a WD that includes indications of LTM measurements and LTM candidate configurations. A network node may be configured to perform and / or update one or more network node procedures in response to receiving an LTM measurement report.

[0019] Embodiments of this disclosure may also provide configurations and methods for third network nodes, such as a serving CU, to configure LTM measurement reports for a WD. For example, in some embodiments, a method is provided for a serving CU that includes transmitting an LTM measurement configuration to the WD containing a configuration of measurements and indications of LTM candidate configurations.

[0020] Embodiments of this disclosure can provide improved efficiency compared to existing systems in LTM measurement reporting, for example, more efficient report formatting. Embodiments of this disclosure provide techniques to achieve improved efficiency than existing systems in combining information (e.g., measurement information) into a report for subsequent transmission via PUSCH or PUCCH. Embodiments of this disclosure can provide report information split into two parts, wherein the size of the second part can be specified in the first part.

[0021] According to one aspect, a WD configured to communicate with a network node is provided. The WD is configured to: receive from the network node a first indication of L1 / L2 triggered mobility LTM measurement configurations, each LTM measurement configuration being associated with an LTM candidate cell configuration index. The WD is further configured to: perform at least one LTM measurement for each LTM candidate cell configuration indicated by the LTM candidate cell configuration index, based on the LTM measurement configuration. The WD is further configured to: transmit an LTM measurement report to the network node, the LTM measurement report including at least one LTM measurement of the LTM candidate cell configuration.

[0022] According to this aspect, in some embodiments, the LTM candidate cell configuration identifier is one of a plurality of LTM candidate cell configurations from a set of LTM candidate cell configurations pre-configured by Radio Resource Control (RRC) signaling. In some embodiments, each LTM measurement configuration specifies at least one primary LTM candidate measurement, at least one LTM serving cell measurement, and a maximum number of auxiliary LTM candidate measurements. In some embodiments, each of the auxiliary LTM candidate measurements is differentially encoded relative to one of the at least one primary LTM candidate measurements. In some embodiments, at least one LTM measurement includes a first measurement of a cell configured as a special cell (SpCell) in the LTM candidate cell configuration. In some embodiments, at least one LTM measurement includes a second measurement of an auxiliary cell (SCell) in the LTM candidate cell configuration. In some embodiments, the LTM measurement report includes a third measurement of a Synchronization Signal Block (SSB), which is configured as a quasi-co-located QCL source of the Active Transmission Configuration Indicator (TCI) state of the WD. In some embodiments, the SSB measurement is included in the LTM measurement report when the SSB is associated with the Physical Cell Identifier (PCI) of the current special cell (SpCell) of the WD. In some embodiments, the LTM measurement report includes a fourth measurement of a Channel State Information Reference Signal (CSI-RS) configured as a quasi-co-located QCL source. In some embodiments, CSI-RS measurements are included in the LTM measurement report when they are associated with the Physical Cell Identifier (PCI) of the current special cell SpCell of the WD. In some embodiments, the LTM measurement report includes at least one LTM serving cell measurement. In some embodiments, the LTM measurement report includes a beam index and the corresponding LTM measurement. In some embodiments, the at least one LTM measurement includes at least one of a first number of primary LTM measurements, a second number of LTM serving cell measurements, and a maximum number of secondary LTM measurements. In some embodiments, the LTM measurement report includes an LTM measurement index associated with multiple LTM candidate cells.

[0023] According to another aspect, a method is provided in a wireless device (WD) configured to communicate with a network node. The method includes: receiving from the network node a first indication of L1 / L2-triggered mobility LTM measurement configurations, each LTM measurement configuration being associated with an LTM candidate cell configuration index. The method further includes: performing at least one LTM measurement for each LTM candidate cell configuration indicated by the LTM candidate cell configuration index, based on the LTM measurement configuration. The method further includes: transmitting an LTM measurement report to the network node, the LTM measurement report including at least one LTM measurement of the LTM candidate cell configuration.

[0024] According to this aspect, in some embodiments, the LTM candidate cell configuration identifier is one of a plurality of LTM candidate cell configurations from a set of LTM candidate cell configurations pre-configured by Radio Resource Control (RRC) signaling. In some embodiments, each LTM measurement configuration specifies at least one primary LTM candidate measurement, at least one LTM serving cell measurement, and a maximum number of auxiliary LTM candidate measurements. In some embodiments, each of the auxiliary LTM candidate measurements is differentially encoded relative to one of the at least one primary LTM candidate measurements. In some embodiments, at least one LTM measurement includes a first measurement of a cell configured as a special cell (SpCell) in the LTM candidate cell configuration. In some embodiments, at least one LTM measurement includes a second measurement of an auxiliary cell (SCell) in the LTM candidate cell configuration. In some embodiments, the LTM measurement report includes a third measurement of a Synchronization Signal Block (SSB), which is configured as a quasi-co-located QCL source of the Active Transmission Configuration Indicator (TCI) state of the WD. In some embodiments, the SSB measurement is included in the LTM measurement report when the SSB is associated with the Physical Cell Identifier (PCI) of the current special cell (SpCell) of the WD. In some embodiments, the LTM measurement report includes a fourth measurement of a Channel State Information Reference Signal (CSI-RS) configured as a quasi-co-located QCL source. In some embodiments, CSI-RS measurements are included in the LTM measurement report when they are associated with the Physical Cell Identifier (PCI) of the current special cell SpCell of the WD. In some embodiments, the LTM measurement report includes at least one LTM serving cell measurement. In some embodiments, the LTM measurement report includes a beam index and the corresponding LTM measurement. In some embodiments, the at least one LTM measurement includes at least one of a first number of primary LTM measurements, a second number of LTM serving cell measurements, and a maximum number of secondary LTM measurements. In some embodiments, the LTM measurement report includes an LTM measurement index associated with multiple LTM candidate cells.

[0025] According to another aspect, a network node configured to communicate with a wireless device (WD) is provided. The network node is configured to: configure at least one L1 / L2 triggered mobility LTM measurement configuration for the WD, each LTM measurement configuration being associated with an LTM candidate cell configuration index. The network node is further configured to: receive LTM measurement reports from the WD, the LTM measurement reports including at least one LTM measurement of the LTM candidate cell configuration indicated by the LTM candidate cell configuration index.

[0026] According to this aspect, in some embodiments, each LTM measurement configuration specifies at least one primary LTM candidate measurement, at least one LTM serving cell measurement, and a maximum number of auxiliary LTM candidate measurements. In some embodiments, each of the auxiliary LTM candidate measurements is differentially encoded relative to one of the at least one primary LTM candidate measurement. In some embodiments, the network node is configured to pre-configure a set of LTM candidate cell configurations for the WD via Radio Resource Control (RRC) signaling, and a second indication specifies a selected LTM candidate cell configuration in the set. In some embodiments, the LTM measurement report includes at least one LTM serving cell measurement. In some embodiments, the LTM measurement report includes a beam index and the corresponding LTM measurement. In some embodiments, the network node is configured to configure an LTM reporting configuration for the WD, the LTM reporting configuration including at least one primary LTM candidate cell configuration. In some embodiments, the LTM reporting configuration is configured to include an indication of a performance metric to be measured, the performance metric including at least one of Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal-to-Interference-plus-Noise Ratio (SINR), and Channel Quality Indicator (CQI). In some embodiments, the LTM report configuration is configured to include an Absolute Radio Channel Number (ARFCN), which is to be applied to at least one of a primary LTM candidate cell configuration and a secondary LTM candidate cell configuration. In some embodiments, the LTM report configuration is configured to include at least one secondary LTM candidate cell configuration, which includes at least one reference signal identifier. In some embodiments, at least one of the at least one reference signal identifier is associated with one of the Absolute Radio Channel Number (ARFCN) and the Physical Cell Identifier (PCI). In some embodiments, at least one of the at least one reference signal identifier is one of the Synchronization Block (SSB) Index and the Channel State Information Reference Signal (CSI-RS) Resource Identifier.

[0027] According to another aspect, a method is provided in a network node configured to communicate with a wireless device (WD). The method includes: configuring at least one L1 / L2 triggered mobility LTM measurement configuration for the WD, each LTM measurement configuration being associated with an LTM candidate cell configuration index. The method further includes: receiving an LTM measurement report from the WD, the LTM measurement report including at least one LTM measurement of the LTM candidate cell configuration indicated by the LTM candidate cell configuration index.

[0028] According to this aspect, in some embodiments, each LTM measurement configuration specifies at least one primary LTM candidate measurement, at least one LTM serving cell measurement, and a maximum number of auxiliary LTM candidate measurements. In some embodiments, each of the auxiliary LTM candidate measurements is differentially encoded relative to one of the at least one primary LTM candidate measurement. In some embodiments, the method includes: pre-configuring a set of LTM candidate cell configurations for the WD via Radio Resource Control (RRC) signaling, and a second indication specifying a selected LTM candidate cell configuration in the set. In some embodiments, the LTM measurement report includes at least one LTM serving cell measurement. In some embodiments, the LTM measurement report includes a beam index and a corresponding LTM measurement. In some embodiments, the method further includes: configuring an LTM reporting configuration for the WD, the LTM reporting configuration including at least one primary LTM candidate cell configuration. In some embodiments, the LTM reporting configuration is configured to include an indication of a performance metric to be measured, the performance metric including at least one of Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal-to-Interference-plus-Noise Ratio (SINR), and Channel Quality Indicator (CQI). In some embodiments, the LTM reporting configuration is configured to include an Absolute Radio Channel Number (ARFCN), the ARFCN to be applied to at least one of the at least one primary LTM candidate cell configuration and the at least one auxiliary LTM candidate cell configuration. In some embodiments, the LTM report configuration is configured to include at least one auxiliary LTM candidate cell configuration, which includes at least one reference signal identifier. In some embodiments, at least one of the at least one reference signal identifier is associated with one of the Absolute Radio Channel Number (ARFCN) and the Physical Cell Identifier (PCI). In some embodiments, at least one of the at least one reference signal identifier is one of the Synchronization Block (SSB) Index and the Channel State Information Reference Signal (CSI-RS) Resource Identifier. Attached Figure Description

[0029] A more comprehensive understanding of the present embodiments and their accompanying advantages and features will be more readily obtained by referring to the following detailed description taken in conjunction with the accompanying drawings, in which: Figure 1 This is a simplified diagram illustrating a sample CSI report format; Figure 2 This is a schematic diagram illustrating an example network architecture of a communication system based on the principles disclosed herein; Figure 3 This is a block diagram of a network node that communicates with a wireless device via a wireless connection according to some embodiments of the present disclosure; Figure 4 This is a flowchart illustrating an example process for LTM reporting in a network node according to some embodiments of this disclosure; Figure 5This is a flowchart illustrating an example process for LTM reporting in a wireless device according to some embodiments of this disclosure; Figure 6 This is a flowchart of another example process for LTM reporting in a network node according to some embodiments of this disclosure; Figure 7 This is a flowchart of another example process for LTM reporting in a wireless device according to some embodiments of this disclosure; Figure 8 These are signaling diagrams illustrating example processes in a communication system including network nodes and wireless devices according to some embodiments of this disclosure; and Figure 9 This is a flowchart of another example process in a communication system including network nodes and wireless devices, according to some embodiments of the present disclosure. Detailed Implementation

[0030] Before describing the exemplary embodiments in detail, it should be noted that the embodiments primarily concern combinations of device components and processing steps related to the configuration for LTM reporting. Therefore, components are indicated in the figures using conventional symbols where appropriate, and only those specific details relevant to understanding these embodiments are shown, so as not to obscure this disclosure from details readily apparent to those skilled in the art who will benefit from the description herein.

[0031] As used herein, relational terms such as “first” and “second,” “top” and “bottom,” etc., are used only to distinguish one entity or element from another, and do not necessarily require or imply any physical or logical relationship or order between such entities or elements. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the concepts described herein. As used herein, unless the context clearly indicates otherwise, the singular forms “a,” “a,” and “the” are intended to include the plural forms as well. It will be further understood that the terms “comprising” and / or “including” as used herein specify the presence of the described features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0032] In the embodiments described herein, connection terms such as “communicating with” can be used to indicate electrical or data communication, which can be achieved, for example, through physical contact, induction, electromagnetic radiation, radio signaling, infrared signaling, or optical signaling. Those skilled in the art will appreciate that multiple components can interoperate, and modifications and variations are possible to achieve electrical and data communication.

[0033] In some embodiments described herein, terms such as “coupled” and “connection” may be used herein to refer to a connection (although not necessarily a direct connection) and may include wired and / or wireless connections.

[0034] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the concepts described herein. As used herein, unless the context clearly indicates otherwise, the singular forms “a,” “a,” and “the” are intended to include the plural forms as well. It will be further understood that the terms “comprising” and / or “including” as used herein specify the presence of the described features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0035] As used herein, the term "network node" can refer to any type of network node contained within a radio network, which may further include any of the following: base station (BS), radio base station, base transceiver station (BTS), base station controller (BSC), radio network controller (RNC), g node B (gNB), evolved node B (eNB or eNodeB), node B, multi-standard radio (MSR) radio node (such as MSR BS), multi-cell / multicast coordination entity (MCE), relay node, donor node of control relay, radio access point (AP), transmission point, transmission node, remote radio unit (RRU), remote radio headend (RRH), core network node (e.g., mobility management entity (MME), ad hoc network (SON) node, coordination node, location node, MDT node, etc.), external node (e.g., third-party node, node outside the current network), node in distributed antenna system (DAS), spectrum access system (SAS) node, component management system (EMS), etc. Network nodes may also include test equipment. The term “radio node” as used in this article can also be used to refer to a wireless device (WD), such as a wireless device (WD) or a radio network node.

[0036] In some embodiments, the non-limiting terms wireless device (WD) or user equipment (UE) may be used interchangeably. A WD as used herein can be any type of wireless device capable of communicating with a network node or another WD via radio signals, such as a wireless device (WD). A WD can also be a radio communication device, a target device, a device-to-device (D2D) WD, a machine-type WD or a WD capable of machine-to-machine (M2M) communication, a low-cost and / or low-complexity WD, a sensor equipped with a WD, a tablet, a mobile terminal, a smartphone, a laptop embedded device (LEE), a laptop-mounted device (LME), a USB dongle, a client device (CPE), an Internet of Things (IoT) device, or a narrowband IoT (NB-IoT) device, etc.

[0037] Furthermore, in some embodiments, the generic term "radio network node" is used. It can be any kind of radio network node, and it can include any of the following: base station, radio base station, base transceiver station, base station controller, network controller, RNC, evolved Node B (eNB), Node B, gNB, multi-cell / multicast coordination entity (MCE), relay node, access point, radio access point, remote radio unit (RRU), remote radio headend (RRH).

[0038] Note that while terms from a particular wireless system such as, for example, 3GPP LTE and / or New Radio (NR) may be used in this disclosure, this should not be construed as limiting the scope of this disclosure to the aforementioned systems. Other wireless systems, including but not limited to Wideband Code Division Multiple Access (WCDMA), Global Microwave Access Interoperability (WiMax), Ultra Mobile Broadband (UMB), and Global System for Mobile Communications (GSM), may also benefit from utilizing the concepts covered in this disclosure.

[0039] It should be noted further that the functions described herein as being performed by wireless devices or network nodes can be distributed across multiple wireless devices and / or network nodes. In other words, it is contemplated that the functions of the network nodes and wireless devices described herein are not limited to being performed by a single physical device, and can in fact be distributed across several physical devices.

[0040] Unless otherwise defined, all terms used herein (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that the terms used herein shall be interpreted as having the same meaning as they have in the context of this specification and related art, and shall not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0041] Some implementations are for configurations used for LTM reporting.

[0042] Referring again to the accompanying drawings, where similar reference numerals denote similar elements, Figure 2 The diagram illustrates a communication system 10 according to an embodiment, such as a 3GPP-type cellular network supporting standards such as LTE and / or NR (5G). It includes an access network 12, such as a radio access network, and a core network 14. The access network 12 includes multiple network nodes 16a, 16b, 16c (collectively referred to as network nodes 16), such as NBs, eNBs, gNBs, or other types of radio access points. Each network node defines a corresponding coverage area 18a, 18b, 18c (collectively referred to as coverage area 18). Each network node 16a, 16b, 16c can be connected to the core network 14 via a wired or wireless connection 20. A first radio device (WD) 22a located in coverage area 18a is configured to wirelessly connect to or be paged by the corresponding network node 16a. A second WD 22b in coverage area 18b can wirelessly connect to the corresponding network node 16b. Although multiple WDs 22a, 22b (collectively referred to as wireless devices 22) are shown in this example, the disclosed embodiments are equally applicable to situations where a single WD is in the coverage area or a single WD is connected to the corresponding network node 16. Note that although only two WDs 22 and three network nodes 16 are shown for convenience, the communication system may include many more WDs 22 and network nodes 16.

[0043] Furthermore, it is envisioned that WD 22 can communicate simultaneously with more than one network node 16 and more than one type of network node 16, and / or be configured to communicate separately with these network nodes 16. For example, WD 22 can have dual connectivity with LTE-enabled network nodes 16 and the same or different network nodes 16 that support NR. For instance, WD 22 can communicate with an eNB for LTE / E-UTRAN and a gNB for NR / NG-RAN.

[0044] Network node 16 (eNB or gNB) is configured to include an LTM configuration unit 24, which is configured to support, for example, LTM configuration for wireless device 22. Wireless device 22 is configured to include an LTM reporting unit 26, which is configured to support, for example, LTM configuration for reporting measurements to one or more network nodes 16.

[0045] Now refer to Figure 3 This describes an example implementation of WD 22 and network node 16 as discussed in the preceding paragraphs, according to an embodiment.

[0046] The communication system 10 includes a network node 16, which is disposed within the communication system 10 and includes hardware 28 that enables it to communicate with the WD 22. The hardware 28 may include a radio interface 30 for establishing and maintaining at least a wireless connection 32 with the WD 22 located within a coverage area 18 served by the network node 16. The radio interface 30 may be configured as or may include, for example, one or more RF transmitters, one or more RF receivers, and / or one or more RF transceivers. The radio interface 30 includes an antenna array 34 to radiate and receive electromagnetic waves carrying one or more signals.

[0047] In the illustrated embodiment, the hardware 28 of network node 16 further includes processing circuitry 36. Processing circuitry 36 may include a processor 38 and memory 40. Specifically, attached to or replacing the processor (such as a central processing unit) and memory, processing circuitry 36 may include integrated circuits for processing and / or control, such as one or more processors and / or processor cores adapted to execute instructions and / or FPGAs (Field-Programmable Gate Arrays) and / or ASICs (Application-Specific Integrated Circuits). Processor 38 may be configured to access (e.g., write to and / or read from) memory 40, which may include any kind of volatile and / or non-volatile memory, such as cache and / or buffer memory and / or RAM (Random Access Memory) and / or ROM (Read-Only Memory) and / or optical memory and / or EPROM (Erasable Programmable Read-Only Memory).

[0048] Therefore, network node 16 further includes software 42, which is internally stored, for example, in memory 40, or stored in external memory (e.g., a database, storage array, network storage device, etc.) accessible to network node 16 via an external connection. Software 42 may be executable by processing circuitry 36. Processing circuitry 36 may be configured to control any of the methods and / or processes described herein, and / or cause such methods and / or processes to be performed, for example, by network node 16. Processor 38 corresponds to one or more processors 38 for performing the functions of network node 16 described herein. Memory 40 is configured to store data, programming software code, and / or other information described herein. In some embodiments, software 42 may include instructions that, when executed by processor 38 and / or processing circuitry 36, cause processor 38 and / or processing circuitry 36 to perform the processes described herein with respect to network node 16. For example, processing circuitry 36 of network node 16 may include LTM configuration unit 24, which is configured to support LTM configuration.

[0049] The communication system 10 further includes the already mentioned WD 22. The WD 22 may have hardware 44, which may include a radio interface 46 configured to establish and maintain a wireless connection 32 with network nodes 16 serving the coverage area 18 where the WD 22 is currently located. The radio interface 46 may be configured as or may include, for example, one or more RF transmitters, one or more RF receivers, and / or one or more RF transceivers. The radio interface 46 includes an antenna array 48 to radiate and receive electromagnetic waves carrying one or more signals.

[0050] The hardware 44 of the WD 22 further includes processing circuitry 50. Processing circuitry 50 may include a processor 52 and memory 54. Specifically, attached to or replacing the processor (such as a central processing unit) and memory, processing circuitry 50 may include integrated circuits for processing and / or control, such as one or more processors and / or processor cores adapted to execute instructions and / or FPGAs (Field-Programmable Gate Arrays) and / or ASICs (Application-Specific Integrated Circuits). Processor 52 may be configured to access (e.g., write to and / or read from) memory 54, which may include any kind of volatile and / or non-volatile memory, such as cache and / or buffer memory and / or RAM (Random Access Memory) and / or ROM (Read-Only Memory) and / or optical memory and / or EPROM (Erasable Programmable Read-Only Memory).

[0051] Therefore, WD 22 may further include software 56, which is stored, for example, in memory 54 at WD 22, or in external memory accessible to WD 22 (e.g., a database, storage array, network storage device, etc.). Software 56 may be executable by processing circuitry 50. Software 56 may include client application 58. Client application 58 may be operable to provide services to human or non-human users via WD 22.

[0052] Processing circuitry 50 may be configured to control any of the methods and / or processes described herein, and / or cause such methods and / or processes to be performed, for example, by WD 22. Processor 52 corresponds to one or more processors 52 for performing the functions of WD 22 described herein. WD 22 includes memory 54 configured to store data, programming software code, and / or other information described herein. In some embodiments, software 56 and / or client application 58 may include instructions that, when executed by processor 52 and / or processing circuitry 50, cause processor 52 and / or processing circuitry 50 to perform the processes described herein with respect to WD 22. For example, processing circuitry 50 of wireless device 22 may include LTM reporting unit 26 configured to support LTM reporting, such as by determining and providing LTM report information to network node 16.

[0053] In some embodiments, the internal operation of network node 16 and WD 22 can be as follows: Figure 3 As shown, and independently, the surrounding network topology can be Figure 2 That way.

[0054] The wireless connection 32 between WD 22 and network node 16 is based on the teachings of embodiments described throughout this disclosure. More specifically, the teachings of some embodiments in these embodiments can improve data rates, latency, and / or power consumption, and thereby provide benefits such as reduced user wait times, relaxed file size limits, better responsiveness, extended battery life, and so on. In some embodiments, a measurement process may be provided for the purpose of monitoring data rates, latency, and other factors that improve upon these one or more embodiments.

[0055] Although Figure 2 and Figure 3 Various "units," such as LTM configuration unit 24 and LTM reporting unit 26, are shown as residing within their respective processors; however, it is contemplated that these units can be implemented such that a portion of the unit is stored in a corresponding memory within the processing circuitry. In other words, these units can be implemented in hardware, or a combination of hardware and software within the processing circuitry.

[0056] Figure 4This is a flowchart of an example process in network node 16 for supporting configuration for LTM reporting. One or more blocks described herein can be performed by one or more elements of network node 16, such as processing circuitry 36 (including LTM configuration unit 24), processor 38, and / or radio interface 30. Network node 16 is configured to optionally transmit (block S100) an LTM measurement configuration to WD 22, which includes a configuration of measurements and indications of LTM candidate configurations. Network node 16 is configured to receive (block S102) an LTM measurement report from WD 22, which includes LTM measurements and indications of at least one LTM candidate configuration. Network node 16 is configured to, in response to receiving an LTM measurement report, perform and / or update (block S104) at least one network node process.

[0057] In some embodiments, the LTM candidate configuration includes at least one of an LTM candidate configuration index and an LTM measurement index. In some embodiments, at least one network node procedure includes selecting an LTM candidate cell configuration to use for an LTM cell handover procedure triggered by a received LTM measurement report.

[0058] Figure 5 This is a flowchart of an example process in wireless device 22 according to some embodiments of the present disclosure. One or more blocks described herein may be performed by one or more elements of wireless device 22, such as one or more of processing circuitry 50 (including LTM reporting unit 26), processor 52, and / or radio interface 46. Wireless device 22 is configured to receive (block S106) an LTM measurement configuration from network node 16, the LTM measurement configuration including a measurement configuration and a first indication of at least one LTM candidate configuration. Wireless device 22 is configured to perform (block S108) an LTM candidate cell 18 measurement based on the received LTM measurement configuration. Wireless device 22 is configured to transmit (block S110) an LTM measurement report to network node 16, the LTM measurement report including at least one LTM measurement and a second indication of at least one associated LTM candidate configuration.

[0059] In some embodiments, the LTM candidate configuration includes at least one of an LTM candidate configuration index and an LTM measurement index. In some embodiments, the LTM measurement report corresponds to a Media Access Control (MAC) control element (CE) transmitted to network node 16.

[0060] Figure 6This is a flowchart of an example process in network node 16 for supporting configurations for LTM reporting. One or more boxes described herein can be executed by one or more elements of network node 16, such as processing circuitry 36 (including LTM configuration unit 24), processor 38, and / or radio interface 30. Network node 16 is configured as a WD configuration (box S112) for at least one L1 / L2 triggered mobility LTM measurement configuration, each LTM measurement configuration associated with an LTM candidate cell configuration index. The method also includes receiving an LTM measurement report from WD 22 (box S114) that includes at least one LTM measurement for the LTM candidate cell configuration indicated by the LTM candidate cell configuration index.

[0061] According to this aspect, in some embodiments, each LTM measurement configuration specifies at least one primary LTM candidate measurement, at least one LTM serving cell measurement, and a maximum number of auxiliary LTM candidate measurements. In some embodiments, each of the auxiliary LTM candidate measurements is differentially encoded relative to one of the at least one primary LTM candidate measurement. In some embodiments, the method includes: pre-configuring a set of LTM candidate cell configurations for WD 22 via Radio Resource Control (RRC) signaling, and a second indication specifying a selected LTM candidate cell configuration in the set. In some embodiments, the LTM measurement report includes at least one LTM serving cell measurement. In some embodiments, the LTM measurement report includes a beam index and a corresponding LTM measurement. In some embodiments, the method further includes: configuring an LTM report configuration for WD 22, the LTM report configuration including at least one primary LTM candidate cell configuration. In some embodiments, the LTM report configuration is configured to include an indication of a performance metric to be measured, the performance metric including at least one of Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal-to-Interference-plus-Noise Ratio (SINR), and Channel Quality Indicator (CQI). In some embodiments, the LTM report configuration is configured to include an Absolute Radio Channel Number (ARFCN), which is to be applied to at least one of a primary LTM candidate cell configuration and a secondary LTM candidate cell configuration. In some embodiments, the LTM report configuration is configured to include at least one secondary LTM candidate cell configuration, which includes at least one reference signal identifier. In some embodiments, at least one of the at least one reference signal identifier is associated with one of the Absolute Radio Channel Number (ARFCN) and the Physical Cell Identifier (PCI). In some embodiments, at least one of the at least one reference signal identifier is one of the Synchronization Block (SSB) Index and the Channel State Information Reference Signal (CSI-RS) Resource Identifier.

[0062] Figure 7This is a flowchart of an example process in wireless device 22 according to some embodiments of the present disclosure. One or more blocks described herein may be performed by one or more elements of wireless device 22, such as processing circuitry 50 (including LTM reporting unit 26), processor 52, and / or radio interface 46. Wireless device 22 is configured to receive (block S116) a first indication of an L1 / L2 triggered mobility LTM measurement configuration from network node 16, each LTM measurement configuration associated with an LTM candidate cell configuration index. The method further includes: performing (block S118) at least one LTM measurement for each LTM candidate cell configuration indicated by the LTM candidate cell configuration index, based on the LTM measurement configuration. The method further includes: transmitting (block S120) an LTM measurement report to network node 16, the LTM measurement report including at least one LTM measurement of the LTM candidate cell configuration.

[0063] According to this aspect, in some embodiments, the LTM candidate cell configuration identifier is one of a plurality of LTM candidate cell configurations from a set of LTM candidate cell configurations pre-configured by Radio Resource Control (RRC) signaling. In some embodiments, each LTM measurement configuration specifies at least one primary LTM candidate measurement, at least one LTM serving cell measurement, and a maximum number of auxiliary LTM candidate measurements. In some embodiments, each of the auxiliary LTM candidate measurements is differentially encoded relative to one of the at least one primary LTM candidate measurements. In some embodiments, at least one LTM measurement includes a first measurement of a cell configured as a special cell SpCell in the LTM candidate cell configuration. In some embodiments, at least one LTM measurement includes a second measurement of an auxiliary cell SCell in the LTM candidate cell configuration. In some embodiments, the LTM measurement report includes a third measurement of a Synchronization Signal Block (SSB), which is configured as a quasi-co-located QCL source of the Active Transmission Configuration Indicator (TCI) state of WD 22. In some embodiments, the SSB measurement is included in the LTM measurement report when the SSB is associated with the Physical Cell Identifier (PCI) of the current special cell SpCell of WD 22. In some embodiments, the LTM measurement report includes a fourth measurement of a Channel State Information Reference Signal (CSI-RS) configured as a quasi-co-located QCL source. In some embodiments, when the CSI-RS is associated with the Physical Cell Identifier (PCI) of the current special cell SpCell of WD 22, the CSI-RS measurement is included in the LTM measurement report. In some embodiments, the LTM measurement report includes at least one LTM serving cell measurement. In some embodiments, the LTM measurement report includes a beam index and the corresponding LTM measurement. In some embodiments, the at least one LTM measurement includes at least one of a first number of primary LTM measurements, a second number of LTM serving cell measurements, and a maximum number of secondary LTM measurements. In some embodiments, the LTM measurement report includes an LTM measurement index associated with a plurality of LTM candidate cells.

[0064] The general process flow of the arrangements of this disclosure has been described, and examples of hardware and software arrangements for implementing the processes and functions of this disclosure have been provided. The following sections provide details and examples of arrangements for supporting configurations for LTM reporting.

[0065] The functions of one or more network nodes 16 described below can be executed by one or more of the processing circuitry 36, processor 38, LTM configuration unit 24, etc. The functions of one or more wireless devices 22 described below can be executed by one or more of the processing circuitry 50, processor 52, LTM reporting unit 26.

[0066] In some embodiments, the LTM measurement report includes at least one primary LTM candidate measurement, wherein the primary LTM candidate measurement includes at least an LTM candidate configuration index and a first measurement value. Table 1 depicts the contents of the primary LTM candidate measurements: LTM Candidate Configuration Index Measured values Beam index (optional) Measurements, differentially coded + beam indexed (optional) Number of LTM serving cells measured (optional) Number of auxiliary LTM candidate measurements (optional) Table 1. Examples of key LTM candidate measurements.

[0067] The LTM configuration index can correspond to an identifier associated with an LTM candidate configuration. WD 22 is configured with an LTM candidate configuration upon receiving an RRC reconfiguration. For example, LTM candidate cell 18 (e.g., "Cell A") has an LTM candidate configuration index of 1; LTM candidate cell 18 (e.g., "Cell B") has an LTM candidate configuration index of 2. RRC reconfigurations can be received from any network node 16 and / or can be stored, pre-configured, etc., in WD 22. One advantage of including a configuration index is that the index value can be encoded using fewer bits than the actual cell identifier of LTM candidate cell 18, since the number of LTM candidate cells 18 may typically be less than the number of cells encoded by the Physical Cell Identifier (PCI).

[0068] In some embodiments, the LTM measurement report corresponds to a MAC control element transmitted to the network by WD 22, and the information to be included corresponds to fields in the MAC CE added based on one or more rules, such as: periodically triggered by a request from network node 16 (e.g., a MAC CE or downlink control information (DCI) received by WD 22) when an event configured by network node 16 is met, etc.

[0069] In some embodiments, WD 22 includes one or more measurements of a cell configured as SpCell 18 in the LTM candidate cell configuration in the LTM measurement report.

[0070] In some embodiments, WD 22 includes in the LTM measurement report one or more measurements of one or more SCells configured in the LTM candidate cell configuration (e.g., Scells configured in CellGroupConfig for LTM candidate cell configuration).

[0071] In some embodiments, WD 22 includes measurements of the SSB associated with the SSB (e.g., L1RSRP) in the LTM measurement report, whereby the SSB is configured as a quasi-co-located (QCL) source (e.g., Type D) with an Active Transport Configuration Indicator (TCI) state that WD 22 has.

[0072] In some embodiments, when an SSB is associated with the PCI of the current SpCell 18 of WD 22, WD 22 includes a measurement of the SSB associated with the SSB (e.g., L1 RSRP) in the LTM measurement report. The SSB is configured as the QCL source of the active TCI state of WD 22 (e.g., type D). In this case, in some embodiments, WD 22 includes an identifier for the SSB. In some embodiments, WD 22 includes the measurement at a specific location in the report (e.g., in the MAC CE, or in the PUCCH / PUSCH report) so that the network node 16 receiving the report knows that the value at that location corresponds to the value of the SSB, which is the QCL source of the currently active TCI state.

[0073] In some embodiments, when the CSI-RS is associated with the PCI of the current SpCell 18 of the WD 22, the WD 22 includes the measurement of the CSI-RS associated with the CSI-RS (e.g., L1 RSRP) in the LTM measurement report, and the CSI-RS is configured as a QCL source (e.g., type D) of the active TCI state that the WD 22 has.

[0074] In some embodiments, when the CSI-RS is associated with the PCI of the current SpCell 18 of the WD 22, the WD 22 includes the measurement of the CSI-RS associated with the CSI-RS (e.g., L1 RSRP) in the LTM measurement report, and the CSI-RS is configured as a QCL source (e.g., type D) of the active TCI state that the WD 22 has.

[0075] In some embodiments, the WD 22 includes in its LTM measurement report a measurement of the SSB or CSI-RS associated with the SSB or CSI-RS of the QCL source (e.g., type D) configured to have an active TCI state with the WD 22 (e.g., L1 RSRP) (as an RSRP value configured with a finite number of bits ('N')) and one or more additional SSB or CSI-RS measurements (differential RSRP) using fewer bits.

[0076] In some embodiments, the LTM measurement report additionally includes at least one auxiliary LTM candidate measurement, wherein the auxiliary LTM candidate measurement includes at least an LTM candidate configuration index and a measurement value, which can be differentially encoded relative to a first measurement value of one of the primary LTM candidate measurements. In some embodiments, the measurement value of the auxiliary LTM candidate measurement is differentially encoded relative to a first primary LTM candidate measurement. Table 2 depicts example contents of the auxiliary LTM candidate measurements: LTM Candidate Configuration Index Measured values, differentially coded Beam index (optional) Measurements, differentially coded + beam indexed (optional) Table 2. Examples of candidate measurements for auxiliary LTM.

[0077] In some embodiments, the LTM measurement report additionally includes one or more LTM serving cell measurements, wherein the LTM serving cell measurements include at least the measured values. Table 3 depicts examples of the contents of LTM serving cell 18 measurements: Measured values Beam index (optional) Measurements, differentially coded + beam indexed (optional) Table 3. Example content of LTM serving cell measurement.

[0078] For example, when configuring LTM candidate cell 18 (e.g., cell A) (and associated SCell 18, e.g., SCell A1, A2, ..., An) and LTM candidate cell 18 (e.g., cell B) (and associated SCell 18, e.g., SCell B1, B2, ..., Bm) for WD 22, including only the LTM configuration index may not be sufficient, as that could lead to ambiguity about whether the index is used for PCell 18 candidates or one of the associated SCell 18.

[0079] In some embodiments, the primary LTM candidate measurement additionally includes a first beam index. In some embodiments, the primary LTM candidate measurement includes multiple pairs of beam indices and measurements.

[0080] In any of the above embodiments, one or more of the measured values ​​may be RSRP values, L1-RSRP values, SINR values, and / or L1-SINR values.

[0081] As described herein, an LTM measurement report may include at least one primary LTM candidate measurement, and optionally one or more secondary LTM measurements, and optionally one or more LTM serving cell 18 measurements. In some embodiments, the number of primary LTM candidate measurements (N1), the number of LTM serving cell measurements (N2), and the number of secondary LTM candidate measurements (N3) may be configured by network node 16. Based on this configuration, WD 22 may include N1 primary LTM candidate measurements, N2 LTM serving cell measurements, and / or N3 secondary LTM candidate measurements in the LTM measurement report.

[0082] In some embodiments, the number of primary LTM candidate measurements (N1), the number of LTM serving cell measurements (N2), and the maximum number of secondary LTM candidate measurements (N3max) can be configured by network node 16. Based on this configuration, WD 22 includes N1 primary LTM candidate measurements, N2 LTM serving cell measurements, and N3 ≤ N3max secondary LTM candidate measurements in the LTM measurement report. In this case, N3 (the number of included secondary LTM candidate measurements) is included in the report. In some embodiments, the N1 primary LTM candidate measurements, N2 LTM serving cell measurements, and the value of N3 constitute part 1 of the LTM measurement report, and the N3 secondary LTM candidate measurements constitute part 2 of the LTM measurement report. In some embodiments, the number of secondary LTM candidate measurements (N3) is included in at least one of the primary LTM candidate measurements, as depicted in Table 1.

[0083] In some embodiments, even if network node 16 configures WD 22 with a maximum number of primary LTM candidate measurements (N1), a maximum number of LTM serving cell 18 measurements (N2), and a maximum number of secondary LTM candidate measurements (N3max), WD 22 may not include primary LTM candidate measurements in the LTM measurement report (N1=0), and the number of secondary LTM candidate measurements may be 0 or less than N3max. This may apply to situations where network node 16 configures WD 22 to perform measurements on LTM candidate cells, but WD 22 can neither detect nor perform measurements on the LTM candidate cell 18. In such cases, WD 22 may still include one or more primary LTM candidate measurements or one or more secondary LTM serving cell 18 measurements, but in this case, either the measurement value is omitted, or it includes values ​​equal to "empty," "NaN," "not detected," or any other value indicating that no measurement is available on the LTM candidate cell.

[0084] In some embodiments, instead of (or appended to) the LTM candidate configuration index, the LTM measurement report may include the LTM measurement index. In these embodiments, network node 16 may configure the LTM measurement index for WD 22. In these embodiments, during LTM configuration, network node 16 may be configured such that each LTM candidate cell configuration can be associated with a certain LTM measurement index. An advantage of such embodiments is that a given LTM measurement can be associated with multiple LTM candidate cells 18.

[0085] In some embodiments, when network node 16 receives an LTM measurement report, the LTM measurement index included in the report can be used to identify all LTM candidate cell 18 configurations associated with the report. Another advantage of some embodiments is that LTM measurements can be configured without necessarily being associated with LTM candidate cells 18.

[0086] In some embodiments, network node 16 provides WD 22 with one or more LTM measurement configurations, wherein each LTM measurement configuration contains a configuration of measurements associated with an LTM candidate configuration index.

[0087] In some embodiments, network node 16 provides WD 22 with one or more LTM measurement configurations, wherein each LTM measurement configuration may contain a configuration of measurements associated with an LTM measurement index.

[0088] In some embodiments, the LTM measurement report may also include an LTM measurement index in addition to the LTM candidate configuration index. This may be used where network node 16 may configure multiple LTM candidate cells 18 to the same LTM candidate cell 18 at WD 22.

[0089] In some embodiments, the resource configuration received by WD 22 for one or more LTM candidates is associated with an LTM report configuration (e.g., an instance of IE LTM-ReportConfig).

[0090] In some embodiments, the LTM report configuration may include the configuration of at least one primary candidate cell 18. The report configuration may also optionally include the configuration of one or more serving cells 18 and one or more secondary candidate cells 18.

[0091] In some embodiments, the LTM reporting configuration may include information about which quantity should be reported, such as RSRP, Signal-to-Interference-plus-Noise Ratio (SINR), Reference Signal Received Quality (RSRQ), or CQI. The reporting quantity may be applicable to the Serving Cell 18 configuration, the Primary Candidate Cell 18 configuration, or the Secondary Candidate configuration.

[0092] In some embodiments, the LTM reporting configuration includes an ARFCN, which may be applicable to either the primary candidate cell 18 configuration or the secondary candidate configuration.

[0093] In some embodiments, the serving cell 18 configuration in the LTM reporting configuration may include a serving cell 18 index or a physical cell 18 identifier. Additionally, the serving cell 18 configuration in the LTM reporting configuration may optionally include one or more reference signal identifiers, wherein the reference signal identifiers are associated with the serving cell 18 index or the physical cell 18 identifier. The reference signal identifier may be an SSB index or a CSI-RS resource ID. Furthermore, the serving cell 18 configuration in the LTM reporting configuration may optionally include information about how many reference signal identifiers should be included in the report. Additionally, the LTM reporting configuration may include information about which quantity should be reported, such as RSRP, SINR, RSRQ, or CQI.

[0094] In some embodiments, the primary candidate cell 18 configuration in the LTM reporting configuration may include a candidate cell 18 measurement identifier, an ARFCN, or a physical cell 18 identifier. In some embodiments, the candidate cell 18 measurement identifier is the same as the LTM candidate configuration index. Additionally, the primary candidate cell 18 configuration in the LTM reporting configuration may optionally include one or more reference signal identifiers, wherein the reference signal identifiers are associated with an ARFCN or a physical cell 18 identifier. The reference signal identifier may be an SSB index or a CSI-RS resource ID. Furthermore, the primary candidate cell 18 configuration in the LTM reporting configuration may optionally include information about how many reference signal identifiers should be included in the report. Additionally, the LTM reporting configuration may include information about which quantity should be reported, such as RSRP, SINR, RSRQ, or CQI.

[0095] In some embodiments, the secondary candidate cell 18 configuration in the LTM reporting configuration may include a candidate cell 18 measurement identifier, an ARFCN, or a physical cell 18 identifier. In some embodiments, the candidate cell 18 measurement identifier is the same as the LTM candidate configuration index. Additionally, the secondary candidate cell 18 configuration in the LTM reporting configuration may optionally include one or more reference signal identifiers, wherein the reference signal identifiers are associated with an ARFCN or a physical cell 18 identifier. The reference signal identifier may be an SSB index or a CSI-RS resource ID. Furthermore, the secondary candidate cell configuration in the LTM reporting configuration may optionally include information about how many reference signal identifiers may be included in the report. Additionally, the LTM reporting configuration may include information about which quantity can be reported, such as RSRP, SINR, RSRQ, or CQI.

[0096] Figure 8 This is a signaling diagram illustrating example message sequences of some embodiments of this disclosure, including the following steps: Step 1. Network node 16 (e.g., gNB) provides WD 22 with an LTM measurement configuration in an RRCReconfiguration message. The LTM measurement configuration includes the configuration of the measurement and indications of LTM candidate configurations, such as an LTM candidate configuration index or an LTM measurement index. Step 2. WD 22 returns an RRC reconfiguration complete message to network node 16 (e.g., gNB). Step 3. WD 22 performs LTM candidate cell measurements based on the received LTM measurement configuration. Step 4. WD 22 transmits an LTM measurement report to network node 16 (e.g., gNB). This LTM measurement report includes LTM measurements and indications of LTM candidate configurations, such as an LTM candidate configuration index or an LTM measurement index. Upon receiving the LTM measurement report, network node 16 (e.g., gNB) can use the LTM candidate configuration indications to select the LTM candidate cell configuration to use for the LTM cell handover procedure triggered by the received measurement report.

[0097] Figure 9 This is a flowchart describing an example embodiment of the present disclosure performed as in WD 22, including: Step 2001. WD 22 receives an LTM measurement configuration from network node 16, which includes a measurement configuration and an indication of LTM candidate configurations, such as an LTM candidate configuration index or an LTM measurement index. Step 2002. WD 22 Perform the measurement according to the received LTM measurement configuration. Step 2003. WD 22 transmits an LTM measurement report to the network node, which includes LTM measurements and indications of LTM candidate configurations, such as an LTM candidate configuration index or an LTM measurement index.

[0098] Some embodiments may include one or more of the following embodiments: Example A1. A network node configured to communicate with a wireless device (WD), the network node being configured to, and / or include a radio interface and / or include processing circuitry and being configured to: Optionally, a layer 1 / layer 2 triggered mobility (LTM) measurement configuration is transmitted to WD, the LTM measurement configuration including the measurement configuration and an indication of LTM candidate configurations; Receive an LTM measurement report from WD, the LTM measurement report including LTM measurements and indications of at least one LTM candidate configuration; and In response to receiving an LTM measurement report, perform and / or update at least one network node procedure.

[0099] Example A2. The network node of Example A1, wherein the LTM candidate configuration includes at least one of the following: LTM candidate configuration index; and LTM Measurement Index.

[0100] Example A3. The network node of Example A1, wherein at least one network node process includes: selecting an LTM candidate cell configuration to be used for an LTM cell handover process triggered by a received LTM measurement report.

[0101] Example B1. A method implemented in a network node configured to communicate with a wireless device, the method comprising: Optionally, a layer 1 / layer 2 triggered mobility (LTM) measurement configuration is transmitted to WD, the LTM measurement configuration including the measurement configuration and an indication of LTM candidate configurations; Receive an LTM measurement report from WD, the LTM measurement report including LTM measurements and indications of at least one LTM candidate configuration; and In response to receiving an LTM measurement report, perform and / or update at least one network node procedure.

[0102] Example B2. The method of Example B1, wherein the LTM candidate configuration includes at least one of the following: LTM candidate configuration index; and LTM Measurement Index.

[0103] Example B3. The method of Example B1, wherein at least one network node process includes: selecting an LTM candidate cell configuration to be used for an LTM cell handover process triggered by a received LTM measurement report.

[0104] Example C1. A wireless device (WD) configured to communicate with a network node, the WD being configured to, and / or including a radio interface and / or processing circuitry, and being configured to: Receives a mobility (LTM) measurement configuration triggered by Layer 1 / Layer 2 from a network node. The LTM measurement configuration includes a measurement configuration and a first indication of at least one LTM candidate configuration. Perform LTM candidate cell measurements based on the received LTM measurement configuration; and Transmit an LTM measurement report to the network node. The LTM measurement report includes at least one LTM measurement and a second indication of at least one associated LTM candidate configuration.

[0105] Example C2. The WD of Example C1, wherein the LTM candidate configuration includes at least one of the following: LTM candidate configuration index; and LTM Measurement Index.

[0106] Example C3. The WD of Example C1, wherein the LTM measurement report corresponds to the Media Access Control (MAC) control element (CE) transmitted to the network node.

[0107] Example D1. A method implemented in a wireless device (WD) configured to communicate with a network node, the method comprising: Receives a mobility (LTM) measurement configuration triggered by Layer 1 / Layer 2 from a network node. The LTM measurement configuration includes a measurement configuration and a first indication of at least one LTM candidate configuration. Perform LTM candidate cell measurements based on the received LTM measurement configuration; and Transmit an LTM measurement report to the network node. The LTM measurement report includes at least one LTM measurement and a second indication of at least one associated LTM candidate configuration.

[0108] Example D2. The method of Example D1, wherein the LTM candidate configuration includes at least one of the following: LTM candidate configuration index; and LTM Measurement Index.

[0109] Example D3. The method of Example D1, wherein the LTM measurement report corresponds to the Media Access Control (MAC) control element (CE) transmitted to the network node.

[0110] As those skilled in the art will appreciate, the concepts described herein can be implemented as methods, data processing systems, computer program products, and / or computer storage media storing executable computer programs. Therefore, the concepts described herein can take the form of all-hardware embodiments, all-software embodiments, or embodiments combining software and hardware aspects, all of which are generally referred to herein as “circuit” or “module.” Any process, step, action, and / or functionality described herein can be performed by, and / or associated with, a corresponding module, which can be implemented in software and / or firmware and / or hardware. Furthermore, this disclosure can take the form of a computer program product embodied on a tangible, computer-usable storage medium, in which computer program code is implemented, and which can be executed by a computer. Any suitable tangible, computer-readable medium can be utilized, including hard disks, CD-ROMs, electronic storage devices, optical storage devices, or magnetic storage devices.

[0111] This document describes several embodiments with reference to flowchart illustrations and / or block diagrams of methods, systems, and computer program products. It will be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer (thus creating a special-purpose computer), a special-purpose computer, or other programmable data processing apparatus to produce a machine such that the instructions, executable via the processor of the computer or other programmable data processing apparatus, create components for implementing the function / action specified in one or more blocks of the flowchart illustrations and / or block diagrams.

[0112] These computer program instructions may also be stored in a computer-readable storage medium or storage medium, thereby directing a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of art comprising instruction components that implement the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0113] Computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, such that the instructions, which execute on the computer or other programmable apparatus, provide steps for implementing the function / action specified in one or more boxes of a flowchart and / or block diagram.

[0114] It is important to understand that the functions / actions annotated in the boxes may not occur in the order annotated in the operation diagram. For example, depending on the functions / actions involved, two boxes shown successively may actually be executed substantially simultaneously, or these boxes may sometimes be executed in reverse order. Although some diagrams include arrows on the communication path to indicate the main communication direction, it is important to understand that communication may occur in the opposite direction to the direction depicted by the arrows.

[0115] Computer program code used to perform the operations of the concepts described herein may be written in an object-oriented programming language such as Python, Java®, or C++. However, computer program code used to perform the operations of this disclosure may also be written in a conventional procedural programming language such as the "C" programming language. The program code may be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer. In the latter scenario, the remote computer may be connected to the user's computer via a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., using an Internet service provider via the Internet).

[0116] Numerous different embodiments have been disclosed herein in conjunction with the foregoing description and accompanying drawings. It will be understood that a literal description and illustration of every combination and sub-combination of these embodiments would be excessively repetitive and obscure. Therefore, all embodiments are capable of being combined in any manner and / or combination, and this specification, including the accompanying drawings, should be considered as constituting a complete written description of all combinations and sub-combinations of the embodiments described herein, as well as the ways and processes of making and using them, and should support the claims for any such combinations or sub-combinations.

[0117] The abbreviations that may be used in the preceding description include: ACK confirmation Automatic Gain Control (AGC) ARFCN Absolute Radio Frequency Channel Number ARQ Automatic Retransmission Request BWP bandwidth portion C-RNTI (Cell Radio Network Temporary Identifier) CA carrier aggregation CE control elements CP cyclic prefix CQI Channel Quality Indicator C-RNTI (Cell Radio Network Temporary Identifier) CSI Channel State Information CSI-RS Channel State Information Reference Signal CU Central Unit DC dual connectivity DCI Downlink Control Information DL downlink DU Distributed Unit The interface between the F1 central unit and the distributed units FDD (Frequency Division Duplex) gNB NR base station HARQ Hybrid ARQ IE Information Elements IP Internet Protocol LTE Long Term Evolution LTM L1 / L2 triggered mobility MCG Main Control Cell Group MAC Media Access Control MAC CE MAC control element MCS modulation and coding scheme MN master node MR-DC Multi-Radio Dual Connectivity NACK (Negative Acknowledgment) NR New Radio PCell Main Cell PCI Physical Cell Identifier PDCCH (Physical Downlink Control Channel) PHR Power Headroom Report PUCCH (Physical Uplink Control Channel) PUSCH Physical Uplink Shared Channel RACH Random Access Channel RAT Radio Access Technology RLC Radio Link Control RRC Radio Resource Control RSRP reference signal received power RSRQ reference signal reception quality SCell auxiliary cell SCG Auxiliary Cell Group SCS Subcarrier Spacing SINR (Signal-to-Interference-plus-Noise Ratio) SR scheduling request SSB Synchronization Signal Block SpCell Special Cell, the main cell in a master or auxiliary cell group. TCI Transmission Configuration Instructions TDD (Time Division Duplex) TPC Transmission Power Control UCI uplink control information UDP User Datagram Protocol UE User Equipment UL uplink UL-SCH uplink shared channel UP User Plane URLLC (Ultra-Reliable Low-Latency Communication)

[0118] Those skilled in the art will appreciate that the embodiments described herein are not limited to those specifically shown and described above. Furthermore, unless otherwise stated above, it should be noted that all drawings are not to scale. In view of the foregoing teachings, various modifications and variations are possible without departing from the scope of the appended claims.

Claims

1. A wireless device WD (22) configured to communicate with a network node (16), said WD (22) being configured to: Receive at least one L1 / L2 triggered mobility LTM measurement configuration from the network node (16), each LTM measurement configuration being associated with an LTM candidate cell configuration index; According to the LTM measurement configuration, at least one LTM measurement is configured to be performed for each LTM candidate cell specified by the LTM candidate cell configuration index; as well as Transmit an LTM measurement report to the network node (16), the LTM measurement report including at least one LTM measurement of the LTM candidate cell configuration.

2. The WD (22) as described in claim 1, wherein, The LTM candidate cell configuration identifier comes from one of multiple LTM candidate cell configurations in the set of LTM candidate cell configurations pre-configured by Radio Resource Control (RRC) signaling.

3. The WD (22) as described in claim 1, wherein, Each LTM measurement configuration specifies at least one primary LTM candidate measurement, at least one LTM serving cell measurement, and a maximum number of secondary LTM candidate measurements.

4. The WD (22) as described in claim 3, wherein, Each of the auxiliary LTM candidate measurements is differentially encoded relative to one of the at least one primary LTM candidate measurements.

5. The WD (22) as claimed in any one of claims 1-4, wherein, The at least one LTM measurement includes a first measurement of a cell that is configured as a special cell SpCell in the LTM candidate cell configuration.

6. The WD (22) as claimed in any one of claims 1-5, wherein, The at least one LTM measurement includes a second measurement of the auxiliary cell SCell in the LTM candidate cell configuration.

7. The WD (22) as claimed in any one of claims 1-6, wherein, The LTM measurement report includes a third measurement of the synchronization signal block SSB, which is configured as a quasi-co-located QCL source of the active transmission configuration indicator TCI state of the WD (22).

8. The WD (22) as claimed in claim 7, wherein, When the SSB is associated with the Physical Cell Identifier (PCI) of the current Special Cell SpCell of the WD (22), the SSB measurement is included in the LTM measurement report.

9. The WD (22) as claimed in any one of claims 1-8, wherein, The LTM measurement report includes a fourth measurement of the Channel State Information Reference Signal (CSI-RS) configured as a quasi-position QCL source.

10. The WD (22) as claimed in claim 9, wherein, When the CSI-RS is associated with the Physical Cell Identifier (PCI) of the current special cell SpCell of the WD (22), the CSI-RS measurement is included in the LTM measurement report.

11. The WD (22) as claimed in any one of claims 1-10, wherein, The LTM measurement report includes at least one LTM serving cell measurement.

12. The WD (22) as claimed in any one of claims 1-11, wherein, The LTM measurement report includes the beam index and the corresponding LTM measurement.

13. The WD (22) as claimed in any one of claims 1-12, wherein, The at least one LTM measurement includes at least one of a first number of primary LTM measurements, a second number of LTM serving cell measurements, and a maximum number of secondary LTM measurements.

14. The WD (22) as claimed in any one of claims 1-13, wherein, The LTM measurement report includes an LTM measurement index associated with multiple LTM candidate cells.

15. A method in a wireless device WD (22) configured to communicate with a network node (16), the method comprising: Receive (S116) at least one L1 / L2 triggered mobility LTM measurement configuration from the network node (16), each LTM measurement configuration being associated with an LTM candidate cell configuration index; According to the LTM measurement configuration, at least one LTM measurement is configured to be performed (S118) for each LTM candidate cell specified by the LTM candidate cell configuration index; as well as Transmit (S120) an LTM measurement report to the network node (16), the LTM measurement report including at least one LTM measurement of the LTM candidate cell configuration.

16. The method of claim 15, wherein, The LTM candidate cell configuration identifier comes from one of multiple LTM candidate cell configurations in the set of LTM candidate cell configurations pre-configured by Radio Resource Control (RRC) signaling.

17. The method of claim 15, wherein, Each LTM measurement configuration specifies at least one primary LTM candidate measurement, at least one LTM serving cell measurement, and a maximum number of secondary LTM candidate measurements.

18. The WD (22) as claimed in claim 17, wherein, Each of the auxiliary LTM candidate measurements is differentially encoded relative to one of the at least one primary LTM candidate measurements.

19. The method of any one of claims 16-18, wherein, The at least one LTM measurement includes a first measurement of a cell that is configured as a special cell SpCell in the LTM candidate cell configuration.

20. The method of any one of claims 16-19, wherein, The at least one LTM measurement includes a second measurement of the auxiliary cell Scell ​​in the LTM candidate cell configuration.

21. The method according to any one of claims 16-20, wherein, The LTM measurement report includes a third measurement of the synchronization signal block SSB, which is configured as a quasi-co-located QCL source of the active transmission configuration indicator TCI state of the WD (22).

22. The method of claim 21, wherein, When the SSB is associated with the Physical Cell Identifier (PCI) of the current Special Cell SpCell of the WD (22), the SSB measurement is included in the LTM measurement report.

23. The method according to any one of claims 16-22, wherein, The LTM measurement report includes a fourth measurement of the Channel State Information Reference Signal (CSI-RS) configured as a quasi-position QCL source.

24. The method of claim 23, wherein, When the CSI-RS is associated with the Physical Cell Identifier (PCI) of the current special cell SpCell of the WD (22), the CSI-RS measurement is included in the LTM measurement report.

25. The method according to any one of claims 16-26, wherein, The LTM measurement report includes at least one LTM serving cell measurement.

26. The method of any one of claims 16-27, wherein, The LTM measurement report includes the beam index and the corresponding LTM measurement.

27. The method of any one of claims 16-28, wherein, The at least one LTM measurement includes at least one of a first number of primary LTM measurements, a second number of LTM serving cell measurements, and a maximum number of secondary LTM measurements.

28. The method of any one of claims 16-29, wherein, The LTM measurement report includes an LTM measurement index associated with multiple LTM candidate cells.

29. A network node (16) configured to communicate with a wireless device WD (22), said network node (16) being configured to: Configure at least one L1 / L2 triggered mobility LTM measurement configuration for the WD (22), each LTM measurement configuration being associated with an LTM candidate cell configuration index; and Receive an LTM measurement report from the WD (22), the LTM measurement report including at least one LTM measurement of the LTM candidate cell configuration indicated by the LTM candidate cell configuration index.

30. The network node (16) as described in claim 31, wherein, Each LTM measurement configuration specifies at least one primary LTM candidate measurement, at least one LTM serving cell measurement, and a maximum number of secondary LTM candidate measurements.

31. The network node (16) as described in claim 30, wherein, Each of the auxiliary LTM candidate measurements is differentially encoded relative to one of the at least one primary LTM candidate measurements.

32. The network node (16) as described in any one of claims 30 and 31, wherein, The network node (16) is configured to pre-configure a set of LTM candidate cell configurations for the WD (22) via Radio Resource Control (RRC) signaling, and the second indication specifies the selected LTM candidate cell configuration in the set.

33. The network node (16) as described in any one of claims 29-32, wherein, The LTM measurement report includes at least one LTM serving cell measurement.

34. The network node (16) as described in any one of claims 29-32, wherein, The LTM measurement report includes the beam index and the corresponding LTM measurement.

35. The network node (16) as described in any one of claims 29-34, wherein, The network node (16) is configured to configure an LTM reporting configuration for the WD (22), the LTM reporting configuration including at least one primary LTM candidate cell configuration.

36. The network node (16) as described in claim 35, wherein, The LTM report configuration is configured to include an indication of the performance metrics to be measured, the performance metrics including at least one of Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal-to-Interference-plus-Noise Ratio (SINR), and Channel Quality Indicator.

37. The network node (16) as described in any one of claims 35 and 36, wherein, The LTM report configuration is configured to include an absolute radio frequency channel number (ARFCN), which is to be applied to at least one of the at least one primary LTM candidate cell configuration and the secondary LTM candidate cell configuration.

38. The network node (16) as described in any one of claims 35-37, wherein, The LTM report configuration is configured to include at least one auxiliary LTM candidate cell configuration, which includes at least one reference signal identifier.

39. The network node (16) as described in claim 38, wherein, At least one of the at least one reference signal identifiers is associated with one of the absolute radio frequency channel number (ARFCN) and the physical cell identifier (PCI).

40. The network node (16) as claimed in any one of claims 38 and 39, wherein, At least one of the at least one reference signal identifiers is one of the Synchronization Signal Block (SSB) index and the Channel State Information Reference Signal (CSI-RS) resource identifier.

41. A method in a network node (16) configured to communicate with a wireless device WD (22), the method comprising: Configure (S112) at least one L1 / L2 triggered mobility LTM measurement configuration for the WD (22), each LTM measurement configuration being associated with an LTM candidate cell configuration index; as well as Receive (S114) an LTM measurement report from the WD (22), the LTM measurement report including at least one LTM measurement of the LTM candidate cell configuration indicated by the LTM candidate cell configuration index.

42. The method of claim 41, wherein, Each LTM measurement configuration specifies at least one primary LTM candidate measurement, at least one LTM serving cell measurement, and a maximum number of secondary LTM candidate measurements.

43. The method of claim 42, wherein, Each of the auxiliary LTM candidate measurements is differentially encoded relative to one of the at least one primary LTM candidate measurements.

44. The method of any one of claims 41-43, further comprising: The WD (22) is pre-configured with a set of LTM candidate cell configurations via Radio Resource Control (RRC) signaling, and the second indication specifies the selected LTM candidate cell configuration in the set.

45. The network node (16) as described in any one of claims 41-44, wherein, The LTM measurement report includes at least one LTM serving cell measurement.

46. ​​The network node (16) as described in any one of claims 41-44, wherein, The LTM measurement report includes the beam index and the corresponding LTM measurement.

47. The method of any one of claims 41-46, further comprising: Configure the LTM reporting configuration for the WD (22), the LTM reporting configuration including at least one primary LTM candidate cell configuration.

48. The method of claim 47, wherein, The LTM report configuration is configured to include an indication of the performance metrics to be measured, the performance metrics including at least one of Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal-to-Interference-plus-Noise Ratio (SINR), and Channel Quality Indicator.

49. The method of any one of claims 47 and 48, wherein, The LTM report configuration is configured to include an absolute radio frequency channel number (ARFCN), which is to be applied to at least one of the at least one primary LTM candidate cell configuration and the secondary LTM candidate cell configuration.

50. The method according to any one of claims 47-49, wherein, The LTM report configuration is configured to include at least one auxiliary LTM candidate cell configuration, which includes at least one reference signal identifier.

51. The method of claim 50, wherein, At least one of the at least one reference signal identifiers is associated with one of the absolute radio frequency channel number (ARFCN) and the physical cell identifier (PCI).

52. The method of any one of claims 50 and 51, wherein, At least one of the at least one reference signal identifiers is one of the Synchronization Signal Block (SSB) index and the Channel State Information Reference Signal (CSI-RS) resource identifier.

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