Enabling special UE measurement operations

Abstract

An apparatus configured to perform candidate target cell measurements at least in part based on a first configuration, receive an indication from a network node to activate at least one transmit configuration indicator state associated with at least one candidate target cell, determine a configuration for performing candidate target cell measurements in response to the indication to activate at least one transmit configuration indicator state, and use that configuration to measure a reduced set of candidate target cells indicated by the first configuration.

Description

Technical Field

[0001] The exemplary and non-limiting embodiments relate generally to lower-layer triggered mobility (LTM), and more specifically to early candidate cell transmission configuration indicator (TCI) state activation in LTM procedures. Background Art

[0002] In LTM, it is known to perform cell switching based on information included in L1 measurement reports. Summary of the Invention

[0003] The following summary is intended to be exemplary only. This summary is not intended to limit the scope of the claims.

[0004] According to one aspect, an apparatus includes at least one processor and at least one memory storing instructions, wherein the instructions, when executed by the at least one processor, cause the apparatus to at least perform candidate target cell measurement based at least in part on a first configuration, receive, from a network node, an indication for activating at least one transmission configuration indicator state associated with at least one candidate target cell, determine a configuration for performing candidate target cell measurement in response to the indication for activating the at least one transmission configuration indicator state, and use the configuration to measure a reduced set of candidate target cells indicated by the first configuration.

[0005] According to one embodiment, the method includes: performing a candidate target cell measurement by user equipment based at least in part on a first configuration; receiving an indication from a network node to activate at least one transmit configuration indicator state associated with at least one candidate target cell; determining a configuration for performing a candidate target cell measurement in response to the indication to activate at least one transmit configuration indicator state; and using the configuration to measure a reduced set of candidate target cells indicated by the first configuration.

[0006] According to one embodiment, the apparatus includes means for performing candidate target cell measurement based at least in part on a first configuration; means for receiving an indication from a network node for activating at least one transmit configuration indicator state associated with at least one candidate target cell; means for determining a configuration for performing candidate target cell measurement in response to the indication for activating at least one transmit configuration indicator state; and means for measuring a reduced set of candidate target cells indicated by the first configuration using the configuration.

[0007] According to one embodiment, a non-temporary computer-readable medium includes program instructions stored thereon for at least performing candidate target cell measurement based at least in part on a first configuration; receiving an indication from a network node to activate at least one transmit configuration indicator state associated with at least one candidate target cell; determining a configuration for performing candidate target cell measurement in response to the indication to activate at least one transmit configuration indicator state; and measuring a reduced set of candidate target cells indicated by the first configuration using the configuration.

[0008] According to one embodiment, the device includes at least one processor and at least one memory for storing instructions, and when an instruction is executed by at least one processor, the device causes at least one user device to transmit a first configuration for performing candidate target cell measurements, transmit an indication to the user device to activate at least one transmit configuration indicator state associated with at least one candidate target cell, and receive at least one measurement report from the user device, the at least one measurement report including at least one indication for at least one measurement for a reduced set of candidate target cells indicated by the first configuration on which the at least one measurement includes one or more measurements performed using the configuration for performing candidate target cell measurements in response to an indication to activate at least one transmit configuration indicator state.

[0009] According to one embodiment, the method includes transmitting a first configuration for performing candidate target cell measurements to a user device; transmitting an indication to the user device by a network node for activating at least one transmit configuration indicator state associated with at least one candidate target cell; and receiving at least one measurement report from the user device, wherein the at least one measurement report includes at least an indication for at least one measurement for a reduced set of candidate target cells indicated by the first configuration on which the method is based; and the at least one measurement includes one or more measurements performed using a configuration for performing candidate target cell measurements in response to an indication for activating at least one transmit configuration indicator state.

[0010] According to one embodiment, the apparatus includes means for transmitting a first configuration for performing candidate target cell measurements to a user device; means for transmitting an indication to the user device for activating at least one transmit configuration indicator state associated with at least one candidate target cell; and means for receiving at least one measurement report from the user device, wherein the at least one measurement report includes at least an indication for at least one measurement for a reduced set of candidate target cells indicated by the first configuration on which the at least one measurement includes one or more measurements performed using a configuration for performing candidate target cell measurements in response to an indication for activating at least one transmit configuration indicator state.

[0011] In one embodiment, a non-temporary computer-readable medium includes a program instruction stored thereon for at least causing to send a first configuration for performing candidate target cell measurements to a user device, to send an indication to the user device for activating at least one transmit configuration indicator state associated with at least one candidate target cell, and to receive at least one measurement report from the user device, wherein the at least one measurement report includes at least an indication for at least one measurement for a reduced set of candidate target cells indicated by the based first configuration, and the at least one measurement includes one or more measurements performed using a configuration for performing candidate target cell measurements in response to an indication for activating at least one transmit configuration indicator state.

[0012] According to some embodiments, the subject matter of the independent claim is provided. Some further embodiments are defined in the dependent claims.

[0013] The following description will explain the following embodiments and other features in reference to the attached drawings. [Brief explanation of the drawing]

[0014] [Figure 1] This block diagram shows one possible non-restrictive exemplary system on which an exemplary embodiment can be implemented. [Figure 2] This is a flowchart showing the steps described in this specification. [Figure 3] This is a flowchart showing the steps described in this specification. [Figure 4] This figure shows the mechanism described in this specification. [Figure 5] This is a flowchart showing the steps described in this specification. [Figure 6]This is a flowchart showing the steps described in this specification. [Figure 7] This is a flowchart showing the steps described in this specification. [Modes for carrying out the invention]

[0015] The following abbreviations, which may appear in this specification and / or in the drawings, are defined as follows: 3GPP Third Generation Partnership Project 5G (fifth generation) 5GC 5G core network AMF (Access and Mobility Management Function) CE control element CFRA (Contention-Free Random Access) CRAN (Cloud Radio Access Network) CSI-RS channel state information reference signal CU (Central Unit) DRB (Data Radio Bearer) DU (Distributed Unit) eNB (or eNodeB) Evolved Node B (e.g., LTE base station) EN-DC E-UTRA-NR Dual Connectivity A node that provides NR user plane and control plane protocol termination to an en-gNB or En-gNB UE and functions as a secondary node in EN-DC E-UTRA Evolved Universal Terrestrial Radio Access, that is, LTE radio access technology gNB (or gNodeB) A base station for 5G / NR, that is, a node that provides NR user plane and control plane protocol termination to a UE and is connected to 5GC via the NG interface I / F Interface L1 Layer 1 L2 Layer 2 L3 Layer 3 LTE Long Term Evolution LTM L1 / L2 Lower-layer Triggered Mobility MAC Medium Access Control MME Mobility Management Entity ng or NG New Generation ng-eNB or NG-eNB Next Generation eNB NR New Radio N / W or NW Network O-RAN Open Radio Access Network PCell Primary Cell PDCCH Physical Downlink Control Channel PDCP Packet Data Convergence Protocol PHY physical layer PRACH (Physical Random Access Channel) PSCell SCG Primary Cell, Primary / Secondary Cell QCL (Quasi-Collocation) RACH (Random Access Channel) RAN (Radio Access Network) RAR (Random Access Response) RF radio frequency RLC radio link control RRC (Radio Resource Control) RRH Remote Radio Head RRM (Radio Resource Management) RS reference signal RTD (Receiving Timing Difference) RU (Radio Unit) Rx receiver SCell (Secondary cell) SDAP (Service Data Adaptation Protocol) SGW (Serving Gateway) SMF session management function SNR (Signal-to-Noise Ratio) SSB synchronization signal block TA Timing Advance TCI transmission configuration indication Tx transmitter UE User devices (e.g., wireless, typically mobile devices) UPF User Plane Function VNR (Virtual Network Function)

[0016] Referring to Figure 1, this figure shows a block diagram of one possible non-limiting embodiment in which the embodiment can be carried out. A user device (UE) 110, a radio access network (RAN) node 170, and a network element 190 are shown. In the embodiment of Figure 1, the user device (UE) 110 wirelessly communicates with the radio network 100. The UE is a radio device that can access the radio network 100. The UE 110 includes one or more processors 120, one or more memories 125, and one or more transceivers 130 interconnected via one or more buses 127. Each of the one or more transceivers 130 includes a receiver Rx 132 and a transmitter Tx 133. The one or more buses 127 can be an address bus, a data bus, or a control bus and may include any interconnection mechanism, such as a series of wires on a motherboard or integrated circuit, optical fiber, or other optical communication equipment. The “circuit” may include hardware that works in conjunction with dedicated hardware or software that can run on it. One or more transceivers 130 are connected to one or more antennas 128. One or more memories 125 contain computer program code 123. The UE 110 includes a module 140 which includes one or both of parts 140-1 and / or 140-2 that can be implemented in several ways. Module 140 may be implemented in hardware as module 140-1, such as being implemented as part of one or more processors 120. Module 140-1 can also be implemented as an integrated circuit or by other hardware such as a programmable gate array. In another embodiment, module 140 may be implemented as computer program code 123 and implemented as module 140-2, which is executed by one or more processors 120. For example, one or more memories 125 and computer program code 123 can be configured by one or more processors 120 to cause user equipment 110 to perform one or more of the operations described herein. The UE 110 communicates with the RAN node 170 via a radio link 111.

[0017] In this embodiment, RAN node 170 is a base station that provides access to the radio network 100 by radio devices such as UE 110. RAN node 170 can be, for example, a base station for 5G, also known as New Radio (NR). In 5G, RAN node 170 may be an NG-RAN node defined as a gNB or ng-eNB. A gNB is a node that provides NR user plane and control plane protocol termination to the UE and is connected to the 5GC (e.g., network element 190) via an NG interface. An ng-eNB is a node that provides E-UTRA user plane and control plane protocol termination to the UE and is connected to the 5GC via an NG interface. An NG-RAN node may include multiple gNBs, including a central unit (CU) (gNB-CU) 196 and distributed units (DU) (gNB-DU), of which DU 195 is shown. Note that a DU may include or be coupled to a radio unit (RU) and be able to control the radio unit (RU). A gNB-CU is a logical node that hosts the RRC, SDAP, and PDCP protocols of the gNB, or the RRC and PDCP protocols of the en-gNB that control the operation of one or more gNB-DUs. A gNB-CU terminates the F1 interface connected to a gNB-DU. Although the F1 interface is shown as reference 198, reference 198 also indicates links between remote elements of RAN node 170 and central elements of RAN node 170, such as between gNB-CU 196 and gNB-DU 195. A gNB-DU is a logical node that hosts the RLC, MAC, and PHY layers of the gNB or en-gNB, and its operation is partially controlled by a gNB-CU. One gNB-CU supports one or more cells. A single cell is supported by only one gNB-DU. A gNB-DU terminates the F1 interface 198 connected to a gNB-CU.While DU195 is considered to include the transceiver 160 as, for example, part of the RU, it should be noted that in some embodiments there may be the transceiver 160 as part of a separate RU, for example, under the control of and connected to DU195. The RAN node 170 may be an eNB (Evolutionary Node B) base station for LTE (Long-Term Evolution), or any other suitable base station, access point, access node, or node.

[0018] RAN node 170 includes one or more processors 152, one or more memories 155, one or more network interfaces (N / WI / F) 161, and one or more transceivers 160, all interconnected via one or more buses 157. Each of the one or more transceivers 160 includes a receiver Rx162 and a transmitter Tx163. One or more transceivers 160 are connected to one or more antennas 158. One or more memories 155 contain computer program code 153. CU 196 may include a processor 152, memory 155, and network interface 161. DU 195 may also include its own memory / multiple memories and processors, and / or other hardware, but these are not shown in the illustration.

[0019] RAN node 170 includes module 150, which includes one or both of parts 150-1 and / or 150-2, which can be implemented in several ways. Module 150 may be implemented in hardware as module 150-1, such as being implemented as part of one or more processors 152. Module 150-1 may be implemented as an integrated circuit or by other hardware such as a programmable gate array. In another embodiment, module 150 may be implemented as module 150-2, which is implemented as computer program code 153 and executed by one or more processors 152. For example, one or more memories 155 and computer program code 153 are configured by one or more processors 152 to cause RAN node 170 to perform one or more of the operations described herein. Note that the functionality of module 150 may be distributed, such as being distributed between DU 195 and CU 196, or it may be implemented by DU 195 alone.

[0020] One or more network interfaces 161 communicate over a network, such as via links 176 and 131. Two or more gNBs 170 can communicate using, for example, link 176. Link 176 may be wired, wireless, or both, and may implement, for example, an Xn interface for 5G, an X2 interface for LTE, or other suitable interfaces for other standards.

[0021] One or more buses 157 may be address buses, data buses, or control buses, and may include any interconnection mechanisms such as a series of wirings on a motherboard or integrated circuit, optical fibers or other optical communication equipment, or radio channels. For example, one or more transceivers 160 may be implemented as a remote radio head (RRH) 195 for LTE, or as a distributed unit (DU) 195 for a gNB implementation for 5G, in which case other elements of the RAN node 170 may be physically located separately from the RRH / DU, and one or more buses 157 can be implemented in part, for example, as optical fiber cables or other suitable network connections to connect other elements of the RAN node 170 (e.g., a central unit (CU), gNB-CU) to the RRH / DU 195. Reference 198 also shows those suitable network links.

[0022] The description herein indicates that a “cell” performs a function, but it will be clear that the equipment forming the cell will perform those functions. A cell constitutes part of a base station; that is, there can be multiple cells for one base station. For example, there may be three cells for a single carrier frequency and associated bandwidth, with each cell covering one-third of a 360-degree area so that the coverage area of ​​that single base station covers roughly an ellipse or circle. Also, each cell can correspond to a single carrier, and a base station can use multiple carriers. Thus, with three 120-degree cells for one carrier and two carriers, a base station has a total of six cells.

[0023] The wireless network 100 may have core network functions and may include one or more network elements 190 that provide connectivity to further networks such as telephone networks and / or data communication networks (e.g., the Internet) via one or more links 181. Such core network functions for 5G may include access and mobility management functions (AMF) and / or user plane functions (UPF) and / or session management functions (SMF). Such core network functions for LTE may include MME (Mobility Management Entity) / SGW (Serving Gateway) functions. It should be noted that these are merely illustrative functions that may be supported by the network elements 190, and both 5G and LTE functions may be supported. The RAN node 170 is coupled to the network elements 190 via link 131. Link 131 may be implemented, for example, as an NG interface for 5G, or an S1 interface for LTE, or another suitable interface for other standards. The network element 190 includes one or more processors 175, one or more memories 171, and one or more network interfaces (N / WI / F) 180 interconnected via one or more buses 185. One or more memories 171 contain computer program code 173. One or more memories 171 and the computer program code 173 are configured by one or more processors 175 to cause the network element 190 to perform one or more operations.

[0024] The wireless network 100 may implement network virtualization, which is the process of combining hardware and software network resources and network functions into a single software-based management entity. Network virtualization is often combined with platform virtualization, which is often combined with resource virtualization. Network virtualization can be categorized as external virtualization, which combines many networks or parts of a network as virtual units, or internal virtualization, which gives network-like functionality to software containers on a single system. For example, a network may be deployed in a telecloud where virtualized network functions (VNFs) run, for example, on data center servers. For example, network core functions and / or wireless access networks (e.g., CloudRAN, O-RAN, edge cloud) may be virtualized. It should be noted that the virtualized entity resulting from network virtualization is still implemented to some extent using hardware such as processors 152 or 175 and memory 155 and 171, and such a virtualized entity also produces technical effects.

[0025] It should also be noted that the operation of the exemplary embodiments of this disclosure can be implemented by multiple collaborative devices (e.g., cRAN).

[0026] The computer-readable memories 125, 155, and 171 can be of any type suitable for the local technical environment and can be implemented using any suitable data storage technology, such as semiconductor-based memory devices, flash memory, magnetic memory devices and systems, optical memory devices and systems, fixed memory, and removable memory. The computer-readable memories 125, 155, and 171 can be means for performing storage functions. The processors 120, 152, and 175 can be of any type suitable for the local technical environment and, in non-limiting examples, may include one or more of general-purpose computers, dedicated computers, microprocessors, digital signal processors (DSPs), and processors based on multicore processor architectures. The processors 120, 152, and 175 can be means for performing functions such as controlling the UE 110, the RAN node 170, and other functions described herein.

[0027] In general, various exemplary embodiments of the user device 110 may include, but are not limited to, cellular phones such as smartphones, tablets, personal digital assistants (PDAs) with wireless communication capabilities, portable computers with wireless communication capabilities, image capture devices such as digital cameras with wireless communication capabilities, game devices with wireless communication capabilities, music storage and playback devices with wireless communication capabilities, internet devices that enable wireless internet access and browsing, tablets with wireless communication capabilities, and portable units or terminals incorporating combinations of such capabilities.

[0028] Having outlined one suitable but non-limiting technical context for implementing the exemplary embodiments of this disclosure, the exemplary embodiments will now be described in more detail.

[0029] The features described herein may generally relate to L1 / L2 trigger mobility (LTM). LTM is a cell switching procedure in which a serving cell of a UE (primary cell (PCell) or primary secondary cell (PSCell)) is switched by the network by sending an LTM cell switching command. The decision to switch LTM cells is made by the UE based on an LTM candidate cell configuration provided by the network for one or more LTM candidate cells, which may be adjacent cells or one of the UE's current serving cells (e.g., secondary cells (SCell)), and may be based on reported L1 measurements.

[0030] Prior to cell switching, the network may optionally activate Transmit Configuration Indicator (TCI) states for one or more candidate cells, and the UE can track the timing of the activated TCI states before cell switching. The UE can also perform early DL and UL synchronization before cell switching.

[0031] Cell switching can be expected to occur immediately after the activation of the early candidate cell TCI state. The time between the activation of the early TCI state and the LTM cell switching command can be considered a period during which measuring and reporting all candidate cells does not support the decision to perform network LTM cell switching.

[0032] TCI activation can be costly, for example, in terms of time and energy consumption, because the UE needs to track the associated DL RS (SSB or TRS) to acquire and maintain time / frequency synchronization. Activation may be performed only for a specific set of RS associated with one or more potential candidate cells. This can be determined based on the LTM L1 report from the UE.

[0033] One example of the LTM procedure is shown in the signaling diagram in Figure 2, based on the RAN2 running change request in TS38.300.

[0034] During the LTM preparation phase 205, at 210, the UE may be in RRC_CONNECTED mode. At 215, the UE may send a measurement report (e.g., a MeasurementReport message) to the gNB. At 220, the gNB may perform LTM candidate preparation. In other words, the gNB may decide to configure the LTM and begin candidate cell preparation. At 225, the gNB may send an RRC reconfiguration message (e.g., an LTM candidate configuration) to the UE. The RRCReconfiguration message may include LTM candidate cell configurations for one or more candidate cells. The UE may store the LTM candidate cell configurations. At 230, the UE may send an RRC reconfiguration complete message (e.g., an RRCReconfigurationComplete message) to the gNB.

[0035] During the early synchronization phase 235, at 240, the UE may perform DL synchronization with one or more candidate cells (for example, before receiving a cell switch command). DL synchronization for candidate cells prior to a cell switch command may be supported based on at least a synchronization signal block (SSB). Before receiving a cell switch command, the UE may perform early timing advance (TA) acquisition with a candidate cell requested by the network. This may be done via non-conflicting random access (CFRA) triggered by a physical downlink control channel (PDCCH) order from the source cell, after which the UE may send a preamble to the indicated candidate cell. To minimize data interruption of the source cell due to CFRA to the candidate cell, the UE does not have to receive a random access response (RAR) for the purpose of acquiring the TA value, and the TA value of the candidate cell may be indicated in the cell switch command. The UE does not have to maintain a TA timer for the candidate cell and may rely on the network implementation to ensure TA validity. At 245, the UE and gNB may perform UL synchronization with one or more candidate cells.

[0036] During the LTM execution phase 250, at 255, the UE can perform an L1 measurement on the configured candidate cell and send a lower-layer measurement report (e.g., an L1 measurement report) to the gNB. The L1 measurement can be performed as long as the RRC configuration is applied at 225. At 260, the gNB can make an LTM decision. The gNB may decide to perform a cell switch to the target cell. At 265, the gNB can send a cell switch command (e.g., a Media Access Control (MAC) control element (CE)) to the UE. The MAC CE can trigger a cell switch by including a candidate configuration index for the target cell. The UE can switch to the target cell and apply the configuration indicated by the candidate configuration index. At 270, the UE can leave the source cell and apply the target configuration. At 275, if the UE does not have a valid TA for the target cell, the UE and gNB can perform a Random Access Channel (RACH) procedure on the target cell, for example.

[0037] During LTM completion phase 280, at 285, the UE and gNB can perform LTM completion. The UE can complete the LTM cell switching procedure, for example, by sending an RRCReconfigurationComplete message to the target cell. If the UE performed the RA procedure at 275, the UE can consider the LTM execution to be successfully completed when the random access procedure is successfully completed. In the case of RACH-less LTM, the UE can consider the LTM execution to be successfully completed when the UE determines that the network has successfully received its first UL data. The UE can determine the successful receipt of its first UL data by receiving a PDCCH addressing the UE's C-RNTI in the target cell, thereby scheduling a new transmission following the first UL data.

[0038] The RRCReconfigurationComplete message can be assumed to be sent at all times during each LTM execution.

[0039] The early synchronization phase 235, the LTM execution phase 250, and the LTM completion phase 280 can be performed multiple times for subsequent LTM cell switching using the LTM candidate cell configuration provided in 225.

[0040] Regarding U-plane handling, the UE can perform a MAC reset during LTM. Whether the UE performs Radio Link Control (RLC) re-establishment and Packet Data Convergence Protocol (PDCP) data recovery during cell switching can be explicitly controlled by the network via RRC signaling. The PDCP data recovery procedure can be applied to the RLC AM data radio bearer (DRB) for LTM cell switching between distributed units (DUs).

[0041] In the case of UE processing, after receiving a cell switching command, the following (but not exhaustive) actions can be assumed to occur: MAC / RLC reset (if configured), radio frequency (RF) restoration (necessary, for example, in the case of different frequencies), and / or baseband restoration.

[0042] LTM uses an integrated TCI state framework. The LTM cell switch command indicates the TCI state of the target cell in the UE. Prior to the cell switch, TCI state activation for LTM candidate cells can be performed by separate MAC-CEs for one or more cooperative and / or isolated DL and UL TCI states. This early TCI state activation can be performed for one or more candidate cells. If not performed before the cell switch, the cell switch command can activate and indicate the target TCI state. The illustrative procedure shown in Figure 3 is based on a RAN2 running change request for 38.300. The early TCI activation in Figure 3 (steps 340, 350) can be placed, for example, between steps 255 and 265 in Figure 2.

[0043] In 310, the UE may be in RRC_CONNECTED mode and / or CM-CONNECTED mode. In 320, gNB (cell A) may send an RRCReconfiguration message to the UE that may contain a list of TCI states for cell B. The gNB to which cell A belongs may provide the UE with a TA acquisition configuration within the RRCReconfiguration message. The TA acquisition configuration may contain all the RRC configuration information necessary to send a random access preamble to cell B so that the gNB to which cell B belongs can calculate the TA value used by the UE (for example, when an LTM cell switching procedure is performed on cell B). The TA acquisition configuration may contain information for one or more cells against which the UE may perform a TA acquisition procedure. In 330, the UE may send an RRCReconfigurationComplete message to gNB (cell A). In 340, gNB (cell A) may send an early TCI state activation MAC CE to the UE that can indicate the TCI state of cell B. At 350, the UE can activate the TCI state of cell B. At 360, the gNB (cell A) can send the TCI state to the UE, for example, with a cell switching command that designates cell B as the target cell.

[0044] When a TCI state is activated for a candidate cell, the UE can be expected to track the timing of the activated TCI state.

[0045] The features described herein generally relate to LTM measurements. For LTM cell switching decisions, the UE can be configured to perform L1 measurements on configured LTM candidate cells and report them to the network. Candidate cells may be the current serving cell and / or adjacent cells. Upon receiving the LTM candidate cell configuration from the network, the UE can be configured to perform L3 measurements on these cells along with the LTM L1 measurements. The L3 measurements may have already been initiated before the LTM candidate cell configuration was transmitted, and the UE can be assumed to continue these measurements while performing the LTM L1 measurements.

[0046] Since L3 measurements can be considered the basis for determining appropriate LTM (re)configuration (e.g., which cells are candidate cells for LTM), legacy L3 measurements can be independent of LTM configuration. Typically, L3 measurements may include a larger set of cells / RS compared to LTM L1 measurements.

[0047] The decision to switch LTM cells is based on L1 measurements as defined by RAN1, although Rel-18 RAN4 has considered the option of performing LTM handovers based on L3 measurements reported in the L1 measurement report (see, for example, Policy R4-2314453, RAN4#108 meeting). This is because the UE may have limitations on the number of adjacent cells for which it can perform L1 measurements, and therefore the UE may only be able to perform L1 measurements on a subset of candidate cells, thereby limiting candidate cell selection to these cells. L3 measurements may be performed in conjunction with L1 measurements on LTM candidate cells.

[0048] L1 measurement reports are sent to distributed units (DUs), while L3 measurement reports are sent to central units (CUs). The decision to switch LTM cells is made by the DUs. Therefore, in order to allow the DUs to use L3 measurements for LTM target cell selection, it was proposed that RAN4 allow L3 measurements to be reported to the DUs, and thus enable target cell selection based on L3 measurements by the DUs, by allowing the UEs to include L3 measurements in their L1 measurement reports.

[0049] Next, referring to Figure 4, an example of DU and CU in the NR's RAN architecture is shown. 5GC(405) can be connected to NG-RAN(415) via NG interfaces(410, 430). NG-RAN(415) may include multiple gNBs(420, 435) connected via Xn-C interfaces(425). gNB(435) may include gNB-CU(440) and one or more gNB-DU(450) connected via F1 interface(445). The latest agreements regarding L3 measurements in the L1 measurement report are as follows: "...2.2 Sub-topic 2-2 Whether or not to use L3 measurement results in the L1 measurement report Task 2-2-1: Whether or not to use the final L3 measurement results in the L1 measurement report. <Agreement>: Optional UE support will be introduced to use L3 measurement results for same-frequency and different-frequency L1 measurement reports. Note: This solution will be excluded from the work item scope if all details and CRs are not finalized in RAN4#109. This solution will be excluded from the work item scope if it affects RAN1 / 2. Option 1: UE features A UE (User Update) function will be introduced to use L3 measurement results for reporting L1 measurement results at the same frequency and at different frequencies. If the number of cells to be measured exceeds the L1-based LTM measurement capabilities, the UE can perform L3 measurements and report them in the L1 reporting format. A UE that supports L3 measurement in the L1 measurement format function must also support the baseline L1 measurement function. measurement report The UE reports based on the L1 measurement configuration. Measurement report mapping: No changes are required to Table 10.1.6.1-1 due to the support for L3 measurements in L1 measurement reports. L3 and L1 measurements are not included in the same report, at least in rel-18. Requirements If applicable, follow the L3 measurement requirements. RAN4 will discuss accuracy requirements during the performance portion. The UE can report L3 measurements in the L1 report, and the number of frequency layers to measure for adjacent cells follows the same requirements as for L3 measurements. Baseline: Same frequency in Section 9.2, different frequencies in Section 9.3 TCI state activation is based on the reported L3 measurement in the L1 measurement report. In FR1, if the L1-RSRP measurement period is 160 milliseconds, the UE does not require additional SSB to meet the transmission timing requirements of the adjacent cell's PRACH. In the case of FR2, the UE may require an additional SSB to satisfy the PRACH transmission timing request of the adjacent cell. Similar to the baseline framework, the L1 measurement format derived using L3 measurement results is reported in the UCI. The same number of M and L apply. RAN4 specifies RRM requirements in the following cases: RTD between smaller and larger cells is supported in CP scenarios. The Rx SNR (i.e., the associated condition) is less than -3dB but greater than -6dB. FFS related to cell switching delay elements. For FR1 and FR2, further investigation is needed to determine whether the UE requires an additional SSB to obtain timing (if the TCI state is activated). Known and unknown cells are supported...

[0050] Considering the above, the UE can report at least one of the following for each LTM candidate cell in the network:

[0051] - L1 measurement results in the L1 measurement report (reported to DU)

[0052] - L3 measurement results in L1 measurement reports (reported to DU and not yet standardized)

[0053] - L3 measurement results in the L3 measurement report (reported to CU)

[0054] UE is optional and does not have to submit measurement reports.

[0055] The number of cells that the UE needs to measure (e.g., L1 measurement) has not yet been agreed upon by RAM4, but it could be, for example, 1 to 3 adjacent cells.

[0056] Measurements, particularly L1 measurements of adjacent cells, consume time and energy, and therefore, from the perspective of the UE, it would be preferable that the UE does not need to perform those measurements if they are not necessary (for example, if the UE can switch to a different cell than the one in which the measurement was performed).

[0057] The purpose of early candidate cell TCI state activation in the LTM procedure (i.e., TCI activation before a cell switch command is sent to the UE) is to prepare the UE for the LTM cell switch and allow for a shorter interruption in the cell switch, in which case it is not necessarily required to track the target TCI state over time. The cell switch can be expected to occur within a short timeframe after the early candidate cell TCI state activation, and in some cases, the network may perform early activation only for candidate cells that the network considers to be promising target cells. Therefore, the period between early TCI state activation and the LTM cell switch command may be considered a period during which measuring and reporting all candidate cells may not be beneficial to the network's LTM cell switch decision.

[0058] A technical effect of the exemplary embodiments of this disclosure may be to optimize UE measurements when the UE is performing early TCI activation.

[0059] In one exemplary embodiment, a special UE measurement operation can be defined. This special UE measurement operation may be applicable after early candidate cell TCI state activation and may differ from the UE measurement operation after receiving the LTM candidate cell configuration.

[0060] In one exemplary embodiment, when the UE receives a MAC-CE (or more MAC-CEs) from the network activating one or more TCI states for one or more LTM candidate cells, the UE may be able to continue or start measurements and reports (or L3 measurement reports in L1 measurement reports) for the LTM candidate cells / RS in which the TCI states are activated. In one exemplary embodiment, when the UE receives a MAC-CE (or more MAC-CEs) from the network activating one or more TCI states for one or more LTM candidate cells, the UE may be able to mitigate or stop measurements for other configured LTM candidate cells / RS.

[0061] In this disclosure, “relaxing” the measurement may mean that the UE does not need to perform part of the measurement (L1) and only needs to perform the other measurement (L3) for those cells. Alternatively, “relaxing” the measurement may mean that the UE does not need to perform frequent (i.e., frequency / periodic) measurements for those cells that may increase the measurement duration / delay of the candidate cells.

[0062] In one exemplary embodiment, during early TCI activation, the number of L1 measurements and measurement reports can be reduced to LTM candidate cells whose TCI state is activated and which can be identified by the network as potential candidate cells. A technical effect of the exemplary embodiments of this disclosure may be a reduction in UE power consumption.

[0063] In one exemplary embodiment, the special UE measurement operation may be defined in a standard or configured by a network. In the latter case, the relevant network signaling for enabling, disabling, or defining this UE measurement operation may be included in the LTM measurement configuration and / or the early TCI state activation MAC-CE.

[0064] This special UE measurement operation, which begins with early TCI state activation for an LTM candidate cell, may be controlled by a timer, or it may continue until the UE receives an LTM cell switch command, a new early LTM candidate cell TCI state activation command, or a new LTM candidate cell configuration before or after a cell switch.

[0065] In one exemplary embodiment (Option 1), when the UE receives a MAC-CE from the network activating one or more candidate cell TCI states for an LTM candidate cell, the UE can continue or start L1 measurements only for LTM candidate cells for which one or more TCI states are activated (and therefore added to the candidate cell TCI state active list). For example, for each configured / activated L1 channel state information (CSI) reporting configuration, the UE only needs to consider the RS (e.g., synchronization signal block (SSB) and / or channel state information reference signal (CSI-RS)) of the candidate cell in the associated resource set / configuration for L1 measurement and reporting for which at least one TCI state is activated. In another embodiment, for each configured / activated L1 CSI reporting configuration, when activating the candidate cell TCI of a candidate cell, the UE only needs to consider the RS (SSB / CSI-RS) in the associated resource set / configuration for L1 measurement and reporting associated with the activated TCI state (for example, RS is configured as the direct / indirect pseudo-collocation (QCL) reference signal for the TCI state). For cells where the UE determines that it will not perform an L1 measurement due to the activated TCI state, the UE can (continue) perform an L3 measurement.

[0066] In another exemplary embodiment (Option 2), when the UE receives a MAC-CE from the network activating one or more candidate cell TCI states for an LTM candidate cell, the UE may simply continue or start L1 and / or L3 measurements for the LTM candidate cell in which one or more TCI states are activated (and therefore in the candidate cell active TCI state list), as in Option 1, and the UE may not need to measure any other LTM candidate cells.

[0067] In one exemplary embodiment, if L3 measurements in the L1 measurement report are supported by the UE, the UE may perform L3 measurements on one or more candidate cells and report them in the L1 measurement report until it receives a candidate cell TCI state activation command for the candidate cells. After this (when the candidate cell TCI state is activated), the UE may continue to report L3 measurements in the L1 measurement report for the cells and / or RS (SSB / CSI-RS) in which one or more TCI states are activated (Option 3). For other LTM candidate cells and / or RS, the UE may continue to perform L3 measurements and report them in the L3 measurement report. In addition to or instead of this, the UE may choose not to measure other candidate cells and / or RS.

[0068] In one exemplary embodiment (Option 4), the UE may initiate L1 measurements for cells and / or RS (SSB / CSI-RS) in which one or more candidate cell TCI states are activated. For other LTM candidate cells and / or RS (SSB / CSI-RS), the UE may continue L3 measurements and report them in the L1 or L3 measurement report. In addition to or instead of this, for other LTM candidate cells and / or RS, the UE may continue reporting L3 measurements in the L3 measurement report. In addition to or instead of this, for other LTM candidate cells and / or RS, the UE may not measure other candidate cells and / or RS (SSB / CSI-RS).

[0069] In one exemplary embodiment, if the network is activating TCI states for multiple candidate cells by separate MAC-CEs, all of the above options may apply only to the one or up to X candidate cells for which TCI state activation was last performed. In other words, the UE may continue L1 measurements only for X ≥ 1 candidate cells with the most recent TCI state-activating MAC-CE, and relax / skip measurements for other candidate cells.

[0070] In one exemplary embodiment, the behavior defined above for the UE may continue until one or more of the following occur: the UE receives an LTM cell switch command; a predefined or network-indicated time elapses since TCI state activation and the UE does not receive a cell switch command; the UE receives another TCI state activation command; and / or the network reconfigures an LTM candidate cell with a new LTM candidate cell configuration (including or excluding the currently measured candidate cell).

[0071] In one exemplary embodiment, the behavior defined above for all the options shown may continue after a cell switch (i.e., the UE moves to a new serving cell) until the UE is given a new LTM configuration. This is the case if the TCI state activated before the cell switch is maintained after the cell switch.

[0072] In one exemplary embodiment, the measurement for a particular candidate cell may further be determined based on the TA acquisition status of that cell, which may be applied independently of or in conjunction with the measurement operation based on TCI state activation (e.g., other exemplary embodiments of the present disclosure). In other words, the narrowing down of cells on which the (L1) measurement is performed may be based on the TA acquisition status, TCI state activation, or both. In one embodiment, for cells on which the UE has sent at least one physical random access channel (PRACH) transmission (i.e., LTM PRACH), the UE may continue to perform L1-RSRP measurements for those target cells. If the UE receives at least one new TCI state activation, the PRACH-based measurement reduction may not be applied (e.g., until a new PRACH is transmitted).

[0073] In one exemplary embodiment, if there was no early TCI state activation prior to the PDCCH order, the PDCCH order can function as a trigger for measurement refinement, similar to a TCI state activation command (for example, the UE may continue the (L1) measurement only for the cells considered by the PDCCH order). If one or more TCI states have already been activated for one or more candidate cells prior to the PDCCH order, the PDCCH order can function as further refinement for the (L1) measurement.

[0074] In one exemplary embodiment, if a PDCCH order is followed by another TCI state activation command, this can override the filtering performed based on the PDCCH order, and the UE can continue measuring (L1) cells that have an active TCI state. This loop can continue as long as it is defined in the option that would stop this special measurement operation (i.e., until a trigger occurs that stops filtering of cells on which the measurement is being performed).

[0075] It should be noted that the special UE measurement behavior when one or more TCI states are activated for multiple LTM candidate cells may apply to the LTM candidate cells and / or RS (SSB / CSI-RS) in which one or more TCI states are currently activated, regardless of how the TCI state activation for multiple cells occurs (i.e., by separate or common MAC-CEs) and whether each MAC-CE for early TCI state activation is applied in addition to or overwrites the previous MAC-CE.

[0076] In one exemplary embodiment, this special UE measurement behavior may be predefined in the standard. In addition to or instead of this, the network may define expected UE measurement behavior, for example, in the LTM candidate cell configuration or other network messages to the UE. In addition to or instead of this, the network may dynamically enable / disable predefined UE measurement behavior after TCI state activation, for example, in the LTM candidate cell configuration or early TCI state activation command.

[0077] In one exemplary embodiment, the UE measurement operation may be configured for each candidate cell. In another exemplary embodiment, a TCI state-specific UE measurement operation may be configured for each candidate cell.

[0078] In one exemplary embodiment, the UE may be configured to perform a candidate target cell measurement (this may be referred to as the first configuration). The measurement may be based (at least partially) on the first configuration. The UE may receive an indication from a network node to activate at least one transmit configuration indicator state associated with at least one candidate target cell. In response to the indication to activate at least one transmit configuration indicator state, the UE may determine, or be configured to determine, a second configuration for performing a candidate target cell measurement. The second configuration may cause the UE to measure a set of candidate target cells based on the first configuration and / or at least one indicated transmit configuration indicator state. In one embodiment, the UE may determine at least one candidate cell for measurement based on the activation of at least one transmit configuration indicator state (which may be, for example, the second configuration). In one embodiment, the set of candidate cells (for the second configuration) may be the set, subset, or reduced set of cells configured in the first configuration. The set of candidate target cells can be at least partially based on an indication that activates at least one transmit configuration indicator state. In a further embodiment, the UE can perform at least one measurement on at least the set of candidate target cells, at least partially based on a second configuration.

[0079] Referring to Figure 5, an example of UE measurement behavior (e.g., Option 2) in the LTM procedure based on candidate cell TCI state activation is shown. In the example of Figure 5, examples of normal UE measurement behavior are shown in 552 and 536. In the example of Figure 5, examples of relaxed UE measurement behavior based on Option 2 after early TCI state activation are shown in 530 and 544. In the example of Figure 5, examples of the network enabling / disabling / defining UE measurement behavior after TCI state activation are shown in 510 and 528.

[0080] During the preparation phase (502), at 504, the UE may be in RRC_CONNECTED mode. At 506, the UE may send an L3 measurement report to the source gNB. At 508, the source gNB may perform LTM candidate preparation. At 510, the source gNB may send the UE an LTM candidate cell configuration that provides measurement and reporting configurations for candidate cells 1-8 according to the relevant TCI state configuration. Optionally, the network may define UE measurement behavior after TCI state activation, or enable / disable predefined / special UE measurement behavior after TCI state activation. The configuration may be provided as an RRC reconfiguration message. At 512, the UE may send an RRC reconfiguration complete message to the source gNB.

[0081] During the LTM execution phase (520), or the UE may perform actions according to 522, 530, 536, or 544, and the UE is not required to perform these options in this order, nor is it required to perform all of these options in a given scenario. For example, the UE may not perform any filtering of the cells in which the measurement is performed, in other words, the UE may perform only 522 (i.e., the default measurement behavior). This may occur, for example, if the early TCI state activation MAC-CE (528) is not received by the UE.

[0082] In 522, the UE can perform default measurement operations. For example, the UE can perform measurements based on its measurement capabilities, according to the LTM candidate cell configuration (and any other applicable measurement configurations) (here, as one embodiment, the UE can perform L1 measurements for three cells and L3 measurements for all eight cells). In 524, the UE can send an L1 measurement report to the source gNB, for example, with results for cells 1-3 based on the measurements performed. In 526, the UE can send an L3 measurement report to the source gNB, for example, with results for cells 1-8 based on the measurements performed. In 528, the source gNB can send an early TCI state activation MAC-CE for cell 2 to the UE. Optionally, the network may enable / disable special / predefined UE measurement operations, here for example by a 1-bit value 1 / 0 = enable / disable.

[0083] In 530, the UE may perform measurements according to the measurement operations defined in Option 2, based on predefined or network-indicated operations (i.e., not perform measurements on candidate cells other than those having at least one active TCI state). In this embodiment, a timer may be started in the TCI state activation command, and when the timer expires (and there was no cell switching command), the UE may stop this special measurement operation. In 532, the UE may perform an L1 measurement and send an L1 measurement report to the source gNB, for example, with results for cell 2. In 534, the timer may expire.

[0084] In 536, after the timer expires, the UE may continue taking measurements according to default behavior, which may be the same as in 522. In 538, the UE may send an L1 measurement report to the source gNB, for example, with results for cells 1-3. In 540, the UE may send an L3 measurement report to the source gNB, for example, with results for cells 1-8. In 543, the source gNB may send an early TCI state activation MAC-CE for cell 3 to the UE.

[0085] At 544, the UE may perform measurements according to the measurement operations defined in Option 2, based on predefined or network-indicated operations. The timer may also be started at this point. In this embodiment, it is assumed that special measurement operations are applied to only one cell at a time, which is why the UE measures and reports only cell 3 and not cell 2. However, in another option, a TCI state activated earlier for cell 2 may be considered active after this point, and the UE may continue L1 measurements for both cell 2 and cell 3, without measuring the other cells. At 546, the UE may send an L1 measurement report to the source gNB, for example, with the result for cell 3. At 548, the source gNB can determine the LTM decision. At 550, the source gNB may send a cell switch command to the UE, for example via MAC CE, to cell 3. In this embodiment, the cell switch command is receivable before the timer expires. At 552, the UE may leave the source gNB and apply the target configuration.

[0086] During the LTM completion phase (560), if the RACH procedure is not RACH-less, the RACH procedure can be performed.

[0087] Figure 6 shows possible steps of the exemplary method 600. The exemplary method 600 may include 610 performing a candidate target cell measurement based at least in part on a first configuration; 620 receiving an indication from a network node to activate at least one transmit configuration indicator state associated with at least one candidate target cell; 630 determining a configuration for performing a candidate target cell measurement in response to the indication to activate at least one transmit configuration indicator state; and 640 measuring a reduced set of candidate target cells indicated by the first configuration using the configuration. The exemplary method 600 may be performed, for example, by a UE. The reduced set may be a narrowed-down set of LTM candidate cells / RS that the UE measures. In addition to or instead of the above, the reduced set may be a set of LTM candidate cells / RS determined by the UE in response to the activation of a special UE measurement operation. In addition to or instead of the above, the reduced set may be a set of LTM candidate cells / RS in which the TCI state is activated. In addition to or instead of the above, the reduced set may be a set of LTM candidate cells / RS for which UE measurement was relaxed and / or stopped.

[0088] Figure 7 shows possible steps of the exemplary method 700. The exemplary method 700 may include transmitting a first configuration to a user device for performing candidate target cell measurements 710; transmitting an indication to the user device for activating at least one transmit configuration indicator state associated with at least one candidate target cell 720; and receiving at least one measurement report from the user device, the at least one measurement report including at least an indication for at least one measurement for a reduced set of candidate target cells indicated by the based first configuration, and the at least one measurement including one or more measurements performed using a configuration for performing candidate target cell measurements in response to an indication for activating at least one transmit configuration indicator state. The exemplary method 700 may be performed, for example, by a base station, network node, eNB, gNB, etc. The reduced set may be a narrowed-down set of LTM candidate cells / RSs for which the UE performs measurements. In addition to or instead of the above, the reduced set may be a set of LTM candidate cells / RS determined by the UE in response to the activation of a special UE measurement operation. In addition to or instead of the above, the reduced set may be a set of LTM candidate cells / RS in which the TCI state is activated. In addition to or instead of the above, the reduced set may be a set of LTM candidate cells / RS in which the UE measurement has not been relaxed and / or stopped.

[0089] In one exemplary embodiment, the device may include at least one processor and at least one memory for storing instructions, which, when executed by the at least one processor, cause the device to perform candidate target cell measurements at least in part based on a first configuration, receive an indication from a network node to activate at least one transmit configuration indicator state associated with at least one candidate target cell, determine a configuration for performing candidate target cell measurements in response to the indication to activate at least one transmit configuration indicator state, and use that configuration to measure a reduced set of candidate target cells indicated by the first configuration.

[0090] The example device can further be configured to establish connections with network nodes, which can be configured to provide serving cells to the device.

[0091] The example device can also be configured to receive a first configuration after a connection to the network has been established.

[0092] The exemplary apparatus can further be configured to send to a network node at least one measurement report, which includes at least one indication of a measurement for at least one candidate target cell from a set of candidate target cells.

[0093] At least one measurement report may include at least one L1 measurement report.

[0094] The exemplary device can further be configured to receive an indication to determine the configuration via at least one of the following: a radio resource control reconfiguration message for lower-layer triggered mobility, a lower-layer triggered mobility configuration, a transmit configuration indicator state activation medium access control message, or a 1-bit value.

[0095] The configuration can be determined based on an indication that activates at least one transmit configuration indicator state associated with at least one candidate target cell.

[0096] The exemplary device can further be configured to send measurement reports to network nodes, including indications of candidate target cell measurements based at least in part on the first configuration.

[0097] The exemplary device can further be configured to determine to switch from using a first configuration to using the above configuration, at least in part, based on an indication that activates at least one transmit configuration indicator state associated with at least one candidate target cell.

[0098] The exemplary apparatus can further be configured to stop performing measurements for one or more candidate target cells whose respective transmit configuration indicator states are not activated, and the one or more candidate target cells may include candidate target cells indicated by the first configuration.

[0099] The exemplary apparatus can further be configured to perform measurements on a first number of candidate target cells, the first number of candidate target cells being less than the number of candidate target cells indicated by the first configuration.

[0100] The exemplary apparatus may further be configured to perform L3 measurements for one or more candidate target cells whose respective transmit configuration indicator states are not activated, and the candidate target cells indicated by the first configuration may include at least one or more of these candidate target cells.

[0101] The exemplary device can further be configured to send an indication of at least one L3 measurement for one or more candidate target cells to a network node via either an L1 measurement report or an L3 measurement report.

[0102] Measuring a reduced set of candidate target cells using the above configuration may further include configuring the exemplary apparatus to perform at least one of at least one L1 measurement or at least one L3 measurement.

[0103] The exemplary device can further be configured to start a timer in response to an indication that activates at least one transmit configuration indicator state, and a configuration that measures a shrinking set of candidate target cells is used during the timer's duration.

[0104] The exemplary apparatus can further be configured to perform measurements based at least in part on the first configuration in response to the expiration of a timer.

[0105] The exemplary device can further be configured to stop measuring a reduced set of candidate target cells using the above configuration and to perform measurements at least partially based on the first configuration in response to at least one of the following: the expiration of a predefined time from the reception of an indication to activate at least one transmit configuration indicator state; the reception of a cell switching command; the reception of a radio resource control reconfiguration message; the reception of a further indication to activate one or more transmit configuration indicator states associated with at least one candidate target cell; or the reception of a lower-layer trigger mobility configuration.

[0106] The number of at least one candidate target cell associated with at least one transmit configuration indicator state can be less than or equal to a predetermined number of candidate target cells associated with the most recently activated transmit configuration indicator state.

[0107] The exemplary apparatus can further be configured to perform one or more measurements on one or more candidate target cells from which a physical downlink control channel order has been received.

[0108] According to one embodiment, an exemplary method may be provided in which a user device performs a candidate target cell measurement based at least in part on a first configuration; receives an indication from a network node to activate at least one transmit configuration indicator state associated with at least one candidate target cell; determines a configuration for performing a candidate target cell measurement in response to the indication to activate at least one transmit configuration indicator state; and measures a reduced set of candidate target cells indicated by the first configuration using the above configuration.

[0109] The exemplary method may further include establishing a connection with a network node, which can be configured to provide serving cells to user equipment.

[0110] The exemplary method may further include receiving a first configuration after a connection with a network node has been established.

[0111] The exemplary method may further include sending to the network node at least one measurement report that includes at least one indication of a measurement for at least one candidate target cell from the set of candidate target cells.

[0112] At least one measurement report may include at least one L1 measurement report.

[0113] The exemplary method can further receive an indication to determine the configuration via at least one of the following: a radio resource control reconfiguration message for lower-layer triggered mobility, a lower-layer triggered mobility configuration, a transmit configuration indicator state activation medium access control message, or a 1-bit value.

[0114] The above configuration may be determined based on an indication that activates at least one transmit configuration indicator state associated with at least one candidate target cell.

[0115] The exemplary method may further include sending a measurement report to the network node that includes an indication of candidate target cell measurements based at least in part on the first configuration.

[0116] The exemplary method may further include determining to switch from using a first configuration to using the above configuration, at least in part, based on an indication that activates at least one transmit configuration indicator state associated with at least one candidate target cell.

[0117] The exemplary method may further include stopping the measurement for one or more candidate target cells whose respective transmit configuration indicator states are not activated, and the one or more candidate target cells may include candidate target cells indicated by the first configuration.

[0118] The exemplary method may further include performing measurements on a first number of candidate target cells, the first number of candidate target cells may be less than the number of candidate target cells indicated by the first configuration.

[0119] The exemplary method may further include performing an L3 measurement for one or more candidate target cells whose respective transmit configuration indicator states are not activated, and the candidate target cells indicated by the first configuration may include at least one or more of those candidate target cells.

[0120] The exemplary method may further include sending an indication of at least one L3 measurement for one or more candidate target cells to a network node via either an L1 measurement report or an L3 measurement report.

[0121] Measuring a reduced set of candidate target cells using the above configuration may involve performing at least one of either at least one L1 measurement or at least one L3 measurement.

[0122] The exemplary method may further include starting a timer in response to an indication that activates at least one transmit configuration indicator state, and at least one measurement for at least one reduction set of candidate target cells may be performed during the timer's duration.

[0123] The exemplary method may further include performing a measurement based at least in part on the first configuration in response to the expiration of the timer.

[0124] The exemplary method may further include, in response to the expiration of a predefined time since the reception of an indication to activate at least one transmit configuration indicator state, the reception of a cell switching command, the reception of a radio resource control reconfiguration message, the reception of a further indication to activate one or more transmit configuration indicator states associated with at least one candidate target cell, or the reception of a lower-layer trigger mobility configuration, stopping the measurement of the reduced set of candidate target cells using the above configuration and performing the measurement at least partially based on the first configuration.

[0125] The number of at least one candidate target cell associated with at least one transmit configuration indicator state can be less than or equal to a predetermined number of candidate target cells associated with the most recently activated transmit configuration indicator state.

[0126] The exemplary method may further include performing one or more measurements on one or more candidate target cells from which a physical downlink control channel order has been received.

[0127] According to one exemplary embodiment, the apparatus may include: a circuit configured to perform candidate target cell measurements based at least in part on a first configuration; a circuit configured to receive an indication from a network node to activate at least one transmit configuration indicator state associated with at least one candidate target cell; and a circuit configured to determine a configuration for performing candidate target cell measurements in response to the indication to activate at least one transmit configuration indicator state, and to use that configuration to measure a reduced set of candidate target cells indicated by the first configuration.

[0128] According to one exemplary embodiment, the apparatus includes a processing circuit, a memory circuit including computer program code, and the memory circuit and the computer program code are configured by the processing circuit to enable the apparatus to perform candidate target cell measurements at least in part based on a first configuration, receive an indication from a network node to activate at least one transmit configuration indicator state associated with at least one candidate target cell, determine a configuration for performing candidate target cell measurements in response to the indication to activate at least one transmit configuration indicator state, and use that configuration to measure a reduced set of candidate target cells indicated by the first configuration.

[0129] As used in this application, the term “circuit” can mean one, more or all of the following: (a) a circuit implementation consisting only of hardware (such as an implementation consisting only of analog and / or digital circuits); (b) a combination of hardware circuits and software, such as (i) a combination of analog and / or digital hardware circuits and software / firmware, and (ii) any part of a hardware processor (including a digital signal processor), software, and memory having software that works together to cause a device such as a mobile phone or server to perform various functions; and (c) a microprocessor or part of a microprocessor that requires software (e.g., firmware) for operation, but the software may not be present when it is not required for operation. This definition of circuit applies to all use of the term in this application, including any claim. As a further example, as used in this application, the term “circuit” can also include an implementation consisting only of a hardware circuit or processor (or more processors), or a part of a hardware circuit or processor and (or their) accompanying software and / or firmware. The term "circuit" also includes, for example, a baseband integrated circuit or processor integrated circuit for a mobile device, or a similar integrated circuit in a server, cellular network device, or other computing or network device, as applicable to a particular claim element.

[0130] According to one exemplary embodiment, the apparatus may include means for performing candidate target cell measurements at least in part based on a first configuration, receiving an indication from a network node for activating at least one transmit configuration indicator state associated with at least one candidate target cell, determining a configuration for performing candidate target cell measurements in response to the indication for activating at least one transmit configuration indicator state, and using that configuration to measure a reduced set of candidate target cells indicated by the first configuration.

[0131] The means can be further configured to establish a connection with a network node, which may be configured to provide serving cells to the device.

[0132] The means can be further configured to receive a first configuration after a connection with a network node has been established.

[0133] The means can be further configured to send to a network node at least one measurement report, which includes at least one indication of a measurement for at least one candidate target cell from a set of candidate target cells.

[0134] At least one measurement report may include at least one L1 measurement report.

[0135] The means can be further configured to receive an indication to determine the configuration via at least one of the following: a radio resource control reconfiguration message for lower-layer trigger mobility, a lower-layer trigger mobility configuration, a transmit configuration indicator state activation medium access control message, or a 1-bit value.

[0136] The configuration can be determined based on an indication that activates at least one transmit configuration indicator state associated with at least one candidate target cell.

[0137] The means can be further configured to send a measurement report to a network node, which includes an indication of candidate target cell measurements based at least in part on the first configuration.

[0138] The means can be further configured to determine to switch from using a first configuration to using the above configuration, at least in part, based on an indication that activates at least one transmit configuration indicator state associated with at least one candidate target cell.

[0139] The means can be further configured to stop performing measurements for one or more candidate target cells whose respective transmit configuration indicator states are not activated, and the one or more candidate target cells may include candidate target cells indicated by the first configuration.

[0140] The means can be further configured to perform measurements for a first number of candidate target cells, the first number of candidate target cells may be less than the number of candidate target cells indicated by the first configuration.

[0141] The means can be further configured to perform L3 measurements for one or more candidate target cells whose respective transmit configuration indicator states are not activated, and the candidate target cells indicated by the first configuration may include at least one or more such candidate target cells.

[0142] The means can be further configured to send an indication of at least one L3 measurement for one or more candidate target cells to a network node via either an L1 measurement report or an L3 measurement report.

[0143] Means configured to measure a reduced set of candidate target cells using the above configuration may include means configured to perform at least one of at least one L1 measurement or at least one L3 measurement.

[0144] The means can be further configured to start a timer in response to an indication that activates at least one transmit configuration indicator state, and a configuration for measuring the shrinking set of candidate target cells is used during the timer's duration.

[0145] The means can be further configured to perform a measurement, at least in part, based on a first configuration, in response to the expiration of a timer.

[0146] The means can be further configured to stop measuring a reduced set of candidate target cells using the above configuration and to perform the measurement at least partially based on the first configuration in response to at least one of the following: the expiration of a predefined time from the reception of an indication that activates at least one transmit configuration indicator state; the reception of a cell switching command; the reception of a radio resource control reconfiguration message; the reception of a further indication that activates one or more transmit configuration indicator states associated with at least one candidate target cell; or the reception of a lower layer trigger mobility configuration.

[0147] The number of at least one candidate target cell associated with at least one transmit configuration indicator state may be less than or equal to a predetermined number of candidate target cells associated with the most recently activated transmit configuration indicator state.

[0148] The means can further be configured to perform one or more measurements on one or more candidate target cells from which a physical downlink control channel order has been received.

[0149] A processor, memory, and / or exemplary algorithms (which can be coded as instructions, programs, or code) may be provided as exemplary means of providing or causing an action to be performed.

[0150] According to one exemplary embodiment, a non-temporary computer-readable medium includes instructions stored thereon, which, when executed by at least one processor, cause at least one processor to perform candidate target cell measurements at least partially based on a first configuration; receive an indication from a network node to activate at least one transmit configuration indicator state associated with at least one candidate target cell; determine a configuration for performing candidate target cell measurements in response to the indication to activate at least one transmit configuration indicator state; and use that configuration to measure a reduced set of candidate target cells indicated by the first configuration.

[0151] According to one exemplary embodiment, a non-temporary computer-readable medium includes program instructions stored thereon for at least: performing candidate target cell measurements based at least in part on a first configuration; causing a network node to receive an indication to activate at least one transmit configuration indicator state associated with at least one candidate target cell; determining a configuration for performing candidate target cell measurements in response to the indication to activate at least one transmit configuration indicator state; and using that configuration to measure a reduced set of candidate target cells indicated by the first configuration.

[0152] According to another exemplary embodiment, a computer-readable non-temporary program storage device can be provided that tangibly implements instructions executable by a computer to perform an operation, the operation including performing a candidate target cell measurement at least in part based on a first configuration; triggering the reception from a network node of an indication that activates at least one transmit configuration indicator state associated with at least one candidate target cell; determining a configuration for performing a candidate target cell measurement in response to the indication that activates at least one transmit configuration indicator state; and using that configuration to measure a reduced set of candidate target cells indicated by the first configuration.

[0153] According to another embodiment of the examples, a non-transient computer-readable medium includes instructions that, when executed by the device, cause the device to perform candidate target cell measurements at least in part on a first configuration; to receive an indication from a network node to activate at least one transmit configuration indicator state associated with at least one candidate target cell; to determine a configuration for performing candidate target cell measurements in response to the indication to activate at least one transmit configuration indicator state; and to use that configuration to measure a reduced set of candidate target cells indicated by the first configuration.

[0154] A computer implementation system includes at least one processor and at least one non-temporary memory for storing instructions, and when an instruction is executed by at least one processor, it causes the system to at least perform a candidate target cell measurement based at least in part on a first configuration; to receive an indication from a network node to activate at least one transmit configuration indicator state associated with at least one candidate target cell; to determine a configuration for performing a candidate target cell measurement in response to the indication to activate at least one transmit configuration indicator state; and to use that configuration to measure a reduced set of candidate target cells indicated by the first configuration.

[0155] A computer-implemented system includes means for performing candidate target cell measurement based at least in part on a first configuration; means for triggering the reception of an indication from a network node for activating at least one transmit configuration indicator state associated with at least one candidate target cell; means for determining a configuration for performing candidate target cell measurement in response to the indication for activating at least one transmit configuration indicator state; and means for using that configuration to measure a reduced set of candidate target cells indicated by the first configuration.

[0156] According to one exemplary embodiment, the device may include at least one processor and at least one memory for storing instructions, which, when executed by at least one processor, cause the device to at least transmit a first configuration to a user device for performing candidate target cell measurements, transmit an indication to the user device for activating at least one transmit configuration indicator state associated with at least one candidate target cell, and receive at least one measurement report from the user device, the at least one measurement report may include at least an indication of at least one measurement for a reduced set of candidate target cells indicated by the first configuration on which the at least one measurement may include one or more measurements performed using the configuration for performing candidate target cell measurements in response to an indication for activating at least one transmit configuration indicator state.

[0157] The example device can be further configured to establish a connection with user equipment, and the device can be configured to provide a serving cell to user equipment.

[0158] The example device can be further configured to send a first configuration to the user's equipment after the connection has been established.

[0159] At least one measurement report may include at least one L1 measurement report.

[0160] The exemplary device can be further configured to transmit an indication to user equipment to determine the configuration via at least one of the following: a radio resource control reconfiguration message for lower-layer triggered mobility, a lower-layer triggered mobility configuration, a transmit configuration indicator state activation medium access control message, or a 1-bit value.

[0161] The exemplary apparatus can further be configured to receive measurement reports from user equipment, including indications of candidate target cell measurements based at least in part on the first configuration.

[0162] A measurement report that includes an indication of candidate target cell measurements based at least partially on the first configuration may include an L3 measurement report.

[0163] An indication that activates at least one transmit configuration indicator state associated with at least one candidate target cell can be configured to cause a user device to switch from a first configuration to the above configuration.

[0164] The exemplary apparatus can further be configured to receive from user equipment at least one indication of an L3 measurement for one or more candidate target cells whose respective transmit configuration indicator state is not activated, via either an L1 measurement report or an L3 measurement report, and the candidate target cells indicated by the first configuration may include at least one or more such cells.

[0165] At least one measurement for the reduced set of candidate target cells may include at least one L1 measurement or at least one L3 measurement.

[0166] The example device can further be configured to send a duration timer to the user's equipment, which allows for a configuration to measure the shrinking set of candidate target cells.

[0167] The number of at least one candidate target cell associated with at least one transmit configuration indicator state can be less than or equal to a predetermined number of candidate target cells associated with the most recently activated transmit configuration indicator state.

[0168] According to one embodiment, an exemplary method can be provided which includes transmitting a first configuration for performing candidate target cell measurements to a user device, a network node transmitting an indication to the user device for activating at least one transmit configuration indicator state associated with at least one candidate target cell, and receiving at least one measurement report from the user device, the at least one measurement report may include at least an indication of at least one measurement for a reduced set of candidate target cells indicated by the first configuration on which the at least one measurement may include one or more measurements performed using a configuration for performing candidate target cell measurements in response to an indication for activating at least one transmit configuration indicator state.

[0169] The exemplary method may further include establishing a connection with user equipment, and the network node may be configured to provide a serving cell to the user equipment.

[0170] The exemplary method may further include sending a first configuration to the user equipment after the connection has been established.

[0171] At least one measurement report may include at least one L1 measurement report.

[0172] The exemplary method may further include sending an indication to the user equipment to determine the configuration via at least one of the following: a radio resource control reconfiguration message for lower-layer trigger mobility, a lower-layer trigger mobility configuration, a transmit configuration indicator state activation medium access control message, or a 1-bit value.

[0173] The exemplary method may further include receiving a measurement report from the user equipment, which includes an indication of candidate target cell measurements based at least in part on a first configuration.

[0174] A measurement report that includes an indication of candidate target cell measurements based at least partially on the first configuration may include an L3 measurement report.

[0175] An indication that activates at least one transmit configuration indicator state associated with at least one candidate target cell can be configured to cause a user device to switch from a first configuration to the above configuration.

[0176] The exemplary method further includes receiving from the user equipment, via either an L1 measurement report or an L3 measurement report, at least one indication of an L3 measurement for one or more candidate target cells whose respective transmit configuration indicator states are not activated, wherein the candidate target cells indicated by the first configuration may include at least one or more such cells.

[0177] At least one measurement for the reduced set of candidate target cells may include at least one L1 measurement or at least one L3 measurement.

[0178] The exemplary method may further include sending a duration timer to the user device for which a configuration is available to measure the shrinking set of candidate target cells.

[0179] The number of at least one candidate target cell associated with at least one transmit configuration indicator state can be less than or equal to a predetermined number of candidate target cells associated with the most recently activated transmit configuration indicator state.

[0180] According to one exemplary embodiment, the apparatus may include a circuit configured to transmit a first configuration to a user device for performing candidate target cell measurements; a circuit configured to transmit an indication to the user device for activating at least one transmit configuration indicator state associated with at least one candidate target cell; and a circuit configured to receive at least one measurement report from the user device, the at least one measurement report may include at least an indication of at least one measurement for a reduced set of candidate target cells indicated by the first configuration based thereon, and the at least one measurement may include one or more measurements performed using a configuration for performing candidate target cell measurements in response to an indication for activating at least one transmit configuration indicator state.

[0181] According to one exemplary embodiment, the apparatus includes a processing circuit, a memory circuit including computer program code, and the memory circuit and the computer program code are configured such that the apparatus can transmit to a user device a first configuration for performing candidate target cell measurements, transmit to the user device an indication for activating at least one transmit configuration indicator state associated with at least one candidate target cell, and receive at least one measurement report from the user device, the at least one measurement report may include at least an indication for at least one measurement for a reduced set of candidate target cells indicated by the first configuration, and the at least one measurement may include one or more measurements performed using the configuration for performing candidate target cell measurements in response to an indication for activating at least one transmit configuration indicator state.

[0182] According to one exemplary embodiment, the apparatus may include means for transmitting a first configuration to a user device for performing candidate target cell measurements, transmitting an indication to the user device for activating at least one transmit configuration indicator state associated with at least one candidate target cell, and receiving at least one measurement report from the user device, the at least one measurement report may include at least an indication of at least one measurement for a reduced set of candidate target cells indicated by the first configuration on which the at least one measurement may include one or more measurements performed using the configuration for performing candidate target cell measurements in response to an indication for activating at least one transmit configuration indicator state.

[0183] The means can further be configured to establish a connection with user equipment, and the device can be configured to provide a serving cell to the user equipment.

[0184] The means can further be configured to send a first configuration to the user equipment after the connection has been established.

[0185] At least one measurement report may include at least one L1 measurement report.

[0186] The means can further be configured to send an indication to the user equipment to determine the configuration, via at least one of the following: a radio resource control reconfiguration message for lower-layer trigger mobility, a lower-layer trigger mobility configuration, a transmit configuration indicator state activation medium access control message, or a 1-bit value.

[0187] The means can further be configured to receive a measurement report from the user equipment, which includes an indication of candidate target cell measurements based at least in part on the first configuration.

[0188] A measurement report that includes an indication of candidate target cell measurements based at least partially on the first configuration may include an L3 measurement report.

[0189] An indication that activates at least one transmit configuration indicator state associated with at least one candidate target cell can be configured to cause a user device to switch from a first configuration to the above configuration.

[0190] The means can further be configured to receive from user equipment at least one indication of an L3 measurement for one or more candidate target cells whose respective transmit configuration indicator state is not activated, via either an L1 measurement report or an L3 measurement report, and the candidate target cells indicated by the first configuration may include at least one or more of those cells.

[0191] At least one measurement for the reduced set of candidate target cells may include at least one L1 measurement or at least one L3 measurement.

[0192] The means can further be configured to send a duration timer to the user device, which allows for a configuration to measure the shrinking set of candidate target cells.

[0193] The number of at least one candidate target cell associated with at least one transmit configuration indicator state can be less than or equal to a predetermined number of candidate target cells associated with the most recently activated transmit configuration indicator state.

[0194] According to one exemplary embodiment, a non-temporary computer-readable medium includes instructions stored thereon, which, when executed by at least one processor, cause at least one processor to transmit a first configuration for performing candidate target cell measurements to a user device, to transmit an indication to the user device for activating at least one transmit configuration indicator state associated with at least one candidate target cell, and to receive at least one measurement report from the user device, the at least one measurement report including at least an indication of at least one measurement for a reduced set of candidate target cells indicated by the first configuration on which the at least one measurement may include one or more measurements performed using the configuration for performing candidate target cell measurements in response to an indication for activating at least one transmit configuration indicator state.

[0195] According to one exemplary embodiment, a non-temporary computer-readable medium includes a program instruction stored thereon to cause a non-temporary computer-readable medium to cause a first configuration for performing candidate target cell measurements to be transmitted to a user device, cause an indication to be transmitted to the user device for activating at least one transmit configuration indicator state associated with at least one candidate target cell, and cause a non-temporary computer-readable medium to cause at least one measurement report to be received from the user device, wherein the at least one measurement report may include at least an indication of at least one measurement for a reduced set of candidate target cells indicated by the first configuration on which the at least one measurement may include one or more measurements performed using the configuration for performing candidate target cell measurements in response to an indication for activating at least one transmit configuration indicator state.

[0196] According to another exemplary embodiment, a computer-readable non-temporary program storage device can be provided that tangibly implements instructions executable by a computer to perform an operation, the operation including causing a first configuration to be transmitted to a user device for performing candidate target cell measurements, causing an indication to be transmitted for activating at least one transmit configuration indicator state associated with at least one candidate target cell, and causing the reception of at least one measurement report from the user device, the at least one measurement report may include at least an indication of at least one measurement for a reduced set of candidate target cells indicated by the first configuration on which the at least one measurement may include one or more measurements performed using the configuration for performing candidate target cell measurements in response to an indication for activating at least one transmit configuration indicator state.

[0197] According to another exemplary embodiment, a non-temporary computer-readable medium includes an instruction that, when executed by the device, causes the device to transmit a first configuration for performing candidate target cell measurements to a user device, causes the transmission of an indication to activate at least one transmit configuration indicator state associated with at least one candidate target cell to the user device, and causes the reception of at least one measurement report from the user device, wherein the at least one measurement report may include at least an indication of at least one measurement for a reduced set of candidate target cells indicated by the first configuration, and the at least one measurement may include one or more measurements performed using the configuration for performing candidate target cell measurements in response to an indication for activating at least one transmit configuration indicator state.

[0198] A computer implementation system includes at least one processor and at least one non-temporary memory for storing instructions, the instructions, when executed by at least one processor, cause the system to at least transmit a first configuration to a user device for performing candidate target cell measurements, cause the transmission of an indication to the user device for activating at least one transmit configuration indicator state associated with at least one candidate target cell, and cause the reception of at least one measurement report from the user device, the at least one measurement report may include at least an indication of at least one measurement for a reduced set of candidate target cells indicated by the first configuration, the at least one measurement may include one or more measurements performed using the configuration for performing candidate target cell measurements in response to an indication for activating at least one transmit configuration indicator state.

[0199] The computer-implemented system includes means for causing a first configuration to be transmitted to a user device for performing candidate target cell measurements; means for causing an indication to be transmitted to the user device for activating at least one transmit configuration indicator state associated with at least one candidate target cell; and means for causing at least one measurement report from the user device, wherein the at least one measurement report may include at least an indication of at least one measurement for a reduced set of candidate target cells indicated by the first configuration on which the at least one measurement may include one or more measurements performed using the configuration for performing candidate target cell measurements in response to an indication for activating at least one transmit configuration indicator state.

[0200] As used herein, the term “non-transient” refers to the limitation of the medium itself (i.e., tangible rather than signal), rather than the limitation of data storage persistence (e.g., RAM or ROM).

[0201] It should be understood that the above description is merely illustrative. Various alternatives and modifications can be devised by those skilled in the art. For example, the features described in the various dependent claims can be combined with each other in any suitable combination. Also, the features of the different embodiments described above can be selectively combined to form new embodiments. Furthermore, the description is intended to encompass all such alternatives, modifications, and variations included in the appended claims.

Claims

1. At least one processor, A device including at least one non-temporary memory for storing instructions, When the instruction is executed by the at least one processor, the device will have at least the following: Candidate target cell measurements are performed based at least partially on the first configuration. The network node receives an indication to activate at least one transmit configuration indicator state associated with at least one candidate target cell. In response to the indication that activates at least one of the transmission configuration indicator states, a configuration for measuring candidate target cells is determined. An apparatus for measuring a reduced set of candidate target cells indicated by the first configuration, using the aforementioned configuration.

2. When the at least one memory is executed by the at least one processor, the device The apparatus according to claim 1, which stores a command to receive the first configuration after a connection with the network node has been established.

3. When the at least one memory is executed by the at least one processor, the device Radio resource control reconfiguration message for lower-layer triggered mobility, Lower layer trigger mobility configuration, Send configuration indicator status activation medium access control message, or 1-bit value, The apparatus according to claim 1 or 2, which stores an instruction to receive an indication for determining the configuration via at least one of the following.

4. The apparatus according to any one of claims 1 to 3, wherein the configuration is determined based on the indication which activates the at least one transmit configuration indicator state associated with the at least one candidate target cell.

5. When the at least one memory is executed by the at least one processor, the device The apparatus according to any one of claims 1 to 4, which stores an instruction causing a determination to switch from using the first configuration to using the configuration, at least in part on the indication that activates the at least one transmit configuration indicator state associated with the at least one candidate target cell.

6. When the at least one memory is executed by the at least one processor, the device The apparatus according to any one of claims 1 to 5, which stores a command to stop performing measurements for one or more candidate target cells whose respective transmit configuration indicator states are not activated, and the one or more candidate target cells include the candidate target cells indicated by the first configuration.

7. When the at least one memory is executed by the at least one processor, the device The apparatus according to any one of claims 1 to 6, which stores instructions for performing measurements for a first number of candidate target cells, wherein the first number of candidate target cells is less than the number of candidate target cells indicated by the first configuration.

8. When the at least one memory is executed by the at least one processor, the device The apparatus according to any one of claims 1 to 7, which stores a command to perform an L3 measurement for one or more candidate target cells whose respective transmit configuration indicator states are not activated, and the candidate target cells indicated by the first configuration include at least one or more candidate target cells.

9. When the at least one memory is executed by the at least one processor, the device The network node is provided with at least one indication of the L3 measurement for the one or more candidate target cells. L1 measurement report, or L3 measurement report, The apparatus according to claim 8, which stores a command to be transmitted via one of the following.

10. Measuring the reduced set of candidate target cells using the above configuration is performed by the at least one processor in the device, At least one L1 measurement, or At least one L3 measurement, The apparatus according to any one of claims 1 to 9, which stores an instruction to perform at least one of the following.

11. When the at least one memory is executed by the at least one processor, the device The apparatus according to any one of claims 1 to 10, which stores an instruction to start a timer in response to the indication that activates the at least one transmit configuration indicator state, and the configuration for measuring the reduced set of candidate target cells is used during the duration of the timer.

12. When the at least one memory is executed by the at least one processor, the device The apparatus according to claim 11, which stores an instruction to perform a measurement based at least partially on the first configuration in response to the expiration of the timer.

13. When the at least one memory is executed by the at least one processor, the device Expiration of a predefined time from the reception of the indication that activates the at least one transmit configuration indicator state, Receiving cell switching command, Receipt of wireless resource control reconfiguration message, Receiving further indications that activate one or more transmit configuration indicator states associated with the at least one candidate target cell, or Receiving lower-layer trigger mobility configuration, In response to at least one of the above, stop measuring the reduced set of candidate target cells using the above configuration, The apparatus according to any one of claims 1 to 12, which stores commands to perform measurements based at least in part on the first configuration.

14. The apparatus according to any one of claims 1 to 13, wherein the number of at least one candidate target cell associated with the at least one transmit configuration indicator state is less than or equal to a predetermined number of candidate target cells associated with the most recently activated transmit configuration indicator state.

15. When the at least one memory is executed by the at least one processor, the device The apparatus according to any one of claims 1 to 14, which stores instructions for causing one or more measurements to be performed for one or more candidate target cells from which a physical downlink control channel order has been received.

16. At least one processor, A device including at least one non-temporary memory for storing instructions, When the instruction is executed by one or more processors, the device will have at least: The system transmits a first configuration to the user device for performing candidate target cell measurement. The user device is instructed to transmit an indication that activates at least one transmit configuration indicator state associated with at least one candidate target cell. An apparatus that receives at least one measurement report from the user device, wherein the at least one measurement report includes at least an indication of at least one measurement for a reduced set of candidate target cells indicated by the first configuration based thereon, and the at least one measurement includes one or more measurements performed using a configuration for performing candidate target cell measurements in response to an indication of activating the at least one transmit configuration indicator state.

17. When the at least one memory is executed by the at least one processor, the device Radio resource control reconfiguration message for lower-layer triggered mobility, Lower layer trigger mobility configuration, Send configuration indicator status activation medium access control message, or 1-bit value, The apparatus according to claim 16, which stores a command to cause the user device to transmit an indication for determining the configuration via at least one of the following.

18. The apparatus according to claim 16 or 17, wherein an indication for activating the at least one transmit configuration indicator state associated with the at least one candidate target cell is configured to cause the user device to switch from the first configuration to the configuration.

19. When the at least one memory is executed by the at least one processor, the device From the user device, at least one indication of an L3 measurement for one or more candidate target cells whose respective transmit configuration indicator states are not activated, L1 measurement report, or L3 measurement report, It stores the command to be received via one of the following: The apparatus according to any one of claims 16 to 18, wherein the candidate target cell indicated by the first configuration includes at least one or more candidate target cells.

20. At least one measurement for the reduced set of candidate target cells is, At least one L1 measurement, or At least one L3 measurement, The apparatus according to any one of claims 16 to 19, including one of the above.

21. When the at least one memory is executed by the at least one processor, the device The apparatus according to any one of claims 16 to 20, which stores a command to cause the user device to transmit a timer for the duration in which the configuration for measuring the reduced set of candidate target cells is used.

22. The apparatus according to any one of claims 16 to 21, wherein the number of at least one candidate target cell associated with the at least one transmit configuration indicator state is less than or equal to a predetermined number of candidate target cells associated with the most recently activated transmit configuration indicator state.

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