Apparatus and method of wireless communication
The event-triggered L1 measurement and reporting mechanism for LTM in 5G systems addresses inefficiencies in existing methods by optimizing UE measurement and reporting of CSI-RS or SS/PBCH blocks, reducing resource consumption and improving system throughput.
Patent Information
- Application Number
- PCT/CN2025/093088
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Priority Date
- 2024-06-26
- Filing Date
- 2025-05-07
- Publication Date
- 2026-01-02
AI Technical Summary
Existing lower layer triggered mobility (LTM) measurement reporting methods in 5G systems suffer from low efficiency, leading to unnecessary uplink resource consumption and limited value for mobility decisions due to inefficient event-triggered reporting mechanisms.
Implementing an event-triggered layer 1 (L1) measurement and reporting mechanism for lower layer triggered mobility (LTM) that includes configuring user equipment (UE) to measure and report channel state information reference signal (CSI-RS) or synchronization signal/physical broadcast channel (SS/PBCH) blocks for candidate cells, using event-triggered LTM events to optimize resource usage and improve system throughput.
The proposed solution reduces the overhead of reference signal consumption and enhances system throughput by optimizing L1 measurement reporting, making it more efficient and useful for mobility decisions.
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Figure CN2025093088_02012026_PF_FP_ABST
Abstract
Description
APPARATUS AND METHOD OF WIRELESS COMMUNICATIONTECHNICAL FIELD
[0001] The present disclosure relates to the field of communication systems, and more particularly, to apparatuses and methods of wireless communication.BACKGROUND
[0002] With the evolution of new radio (NR) in fifth-generation (5G) systems, lower layer triggered mobility (LTM) has been introduced to improve mobility management efficiency. LTM relies on user equipment (UE) performing layer 1 (L1) measurements and reporting for candidate cells to support fast cell and beam switching. However, existing measurement reporting methods often suffer from low efficiency, leading to unnecessary uplink resource consumption and limited value for mobility decisions. Therefore, a more efficient event-triggered reporting mechanism is needed to enhance system performance.
[0003] Therefore, there is a need for apparatuses and methods of wireless communication.SUMMARY
[0004] An object of the present disclosure is to propose apparatuses and methods of wireless communication, which can solve issues in the prior art and other issues, reduce an overhead of reference signal, and / or boost a system throughput.
[0005] In a first aspect of the present disclosure, a method of wireless communication performed by a user equipment (UE) includes operating event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) ; and for a candidate cell, receiving one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks from a base station and measuring the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell.
[0006] In a second aspect of the present disclosure, a UE includes an executor configured to operate event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) and a receiver, wherein for a candidate cell, the receiver is configured to receive one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks from a base station, and the executor is configured to measure the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell.
[0007] In a third aspect of the present disclosure, a UE includes a memory, a transceiver, and a processor coupled to the memory and the transceiver. The UE is configured to perform the above method.
[0008] In a fourth aspect of the present disclosure, a method of wireless communication performed by a base station includes configuring a user equipment (UE) to operate event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) ; and for a candidate cell, transmitting, to the UE, one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks, and requesting the UE to measure the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell.
[0009] In a fifth aspect of the present disclosure, a base station includes an executor configured to configure a user equipment (UE) to operate event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) and a transmitter, wherein for a candidate cell, the transmitter is configured to transmit, to the UE, one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks, and the executor is configured to request the UE to measure the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell.
[0010] In a sixth aspect of the present disclosure, a base station includes a memory, a transceiver, and a processor coupled to the memory and the transceiver. The base station is configured to provide the above method.
[0011] In a seventh aspect of the present disclosure, a non-transitory machine-readable storage medium has stored thereon instructions that, when executed by a computer, cause the computer to perform the above method.
[0012] In an eighth aspect of the present disclosure, a chip includes a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the above method.
[0013] In a ninth aspect of the present disclosure, a computer readable storage medium, in which a computer program is stored, causes a computer to execute the above method.
[0014] In a tenth aspect of the present disclosure, a computer program product includes a computer program, and the computer program causes a computer to execute the above method.
[0015] In an eleventh aspect of the present disclosure, a computer program causes a computer to execute the above method.BRIEF DESCRIPTION OF DRAWINGS
[0016] In order to illustrate the embodiments of the present disclosure or related art more clearly, the following figures will be described in the embodiments are briefly introduced. It is obvious that the drawings are merely some embodiments of the present disclosure, a person having ordinary skill in this field can obtain other figures according to these figures without paying the premise.
[0017] FIG. 1 is a block diagram of one or more user equipments (UEs) and a base station of communication in a communication network system according to an embodiment of the present disclosure.
[0018] FIG. 2 is a block diagram of a UE according to an embodiment of the present disclosure.
[0019] FIG. 3 is a block diagram of a UE according to an embodiment of the present disclosure.
[0020] FIG. 4 is a flowchart illustrating a method of wireless communication performed by a UE according to an embodiment of the present disclosure.
[0021] FIG. 5 is a block diagram of a base station according to an embodiment of the present disclosure.
[0022] FIG. 6 is a block diagram of a base station according to an embodiment of the present disclosure.
[0023] FIG. 7 is a flowchart illustrating a method of wireless communication performed by a base station according to an embodiment of the present disclosure.
[0024] FIG. 8 is a block diagram of an example of a computing device according to an embodiment of the present disclosure.
[0025] FIG. 9 is a block diagram of a communication system according to an embodiment of the present disclosure.DETAILED DESCRIPTION OF EMBODIMENTS
[0026] Embodiments of the present disclosure are described in detail with the technical matters, structural features, achieved objects, and effects with reference to the accompanying drawings as follows. Specifically, the terminologies in the embodiments of the present disclosure are merely for describing the purpose of the certain embodiment, but not to limit the disclosure.
[0027] The technical solutions of the embodiments of the present disclosure can be applied to various communication systems, such as a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) system, a general packet radio service (GPRS) , a long term evolution (LTE) system, a LTE frequency division duplex (FDD) system, a LTE time division duplex (TDD) system, an advanced long term evolution (LTE-A) system, a new radio (NR) system, an evolution system of a NR system, a LTE-based access to unlicensed spectrum (LTE-U) system, a NR-based access to unlicensed spectrum (NR-U) system, an universal mobile telecommunication system (UMTS) , a global interoperability for microwave access (WiMAX) communication system, wireless local area networks (WLAN) , wireless fidelity (Wi-Fi) , a future 5th generation (5G) system (may also be called a new radio (NR) system) or other communication systems, etc.
[0028] Optionally, a base station mentioned in the embodiments of the present application can provide a communication coverage for a specific geographic area and can communicate with a user equipment (UE) located in the coverage area. Optionally, the base station may be a gNB, a base transceiver station (BTS) in the GSM or in the CDMA system, or may be a NodeB (NB) in the WCDMA system, or may be an evolutional Node B (eNB or eNodeB) in the LTE system, or a radio controller in a cloud radio access network (CRAN) .
[0029] A user equipment (UE) may refer to an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device. The access terminal may be a cellular radio telephone, a cordless telephone, a session initiation protocol (SIP) telephone, a wireless local loop (WLL) station, a personal digital assistant (PDA) , a handheld device with wireless communication functions, a computing device, other processing devices coupled with a wireless modem, an in-vehicle device, a wearable device, a terminal device in a future 5G network, a terminal device in a future evolved public land mobile network (PLMN) , etc.
[0030] Optionally, the communication system in the embodiment of the present application may be applied to an unlicensed spectrum, where the unlicensed spectrum may also be considered as a shared spectrum; or the communication system in the embodiment of the present application may also be applied to a licensed spectrum, where the licensed spectrum can also be considered an unshared spectrum.
[0031] The NR / 5G system supports the function of lower layer triggered mobility (LTM) , also referred to as layer 1 / layer 2 (L1 / L2) triggered mobility. To support LTM, the NR / 5G system also supports L1 measurement and reporting for candidate cells.
[0032] To support LTM, the UE is first configured with a set of candidate cells and, for each candidate cell, one or more synchronization signal / physical broadcast channel (SS / PBCH) blocks. The configured SS / PBCH blocks allow the UE to obtain synchronization and perform corresponding layer 1 reference signal received power (L1-RSRP) measurements. In other words, the UE can measure the L1-RSRP on the configured SS / PBCH blocks of each candidate cell. For L1 measurement and reporting of candidate cells, the UE is configured using the RRC parameter LTM-CSI-ReportConfigToAddModList, which provides the necessary configuration for reporting L1-RSRP measurements. This configuration includes a list of candidate cells and the number of SS / PBCH blocks associated with each. Each reporting configuration (LTM-CSI-ReportConfig) is linked to a corresponding resource configuration (LTM-CSI-ResourceConfig) used for L1-RSRP measurement. Each LTM-CSI-ResourceConfig contains a list of Z (where Z is greater than or equal to 1) SS / PBCH block indices and a corresponding list of Z candidate cell identifiers (IDs) , mapping each block index to a candidate cell. For each configured candidate cell, the UE can determine the time-domain behavior and frequency-domain characteristics of the SS / PBCH block based on the higher-layer parameters included in the configuration.
[0033] The UE can be configured to report the L1 measurement results of K candidate cells. For each reported candidate cell, the UE may be requested to report L1 measurements for N SS / PBCH blocks. Accordingly, in each reporting instance, the UE would report L1-RSRP measurements for a total of K × N SS / PBCH blocks (K by N SS / PBCH blocks) . Additionally, the UE can be configured to include the serving cell in the measurement report. When such configuration is applied, one of the reported K candidate cells shall be the serving cell.
[0034] The LTM L1-RSRP measurement reporting supports the following reporting behaviors: aperiodic reporting on physical uplink shared channel (PUSCH) , semi-persistent reporting on PUSCH, semi-persistent reporting on physical uplink control channel (PUCCH) , and periodic reporting on PUCCH.
[0035] One drawback of the current L1 measurement and reporting of SS / PBCH for candidate cells is its low reporting efficiency. It may consume a large amount of uplink resources on PUSCH or PUCCH, while the L1 measurements reported by the UE may not be sufficiently useful for the system to make decisions regarding early synchronization and / or cell or beam selection. The proposed methods support an efficient event-triggered L1 measurement reporting mechanism for LTM, where the reported measurements can be utilized by the system to determine suitable candidate cells and beams for early synchronization, as well as to identify the target cell or beam for triggering an LTM-based cell switch.
[0036] Some embodiments of the present disclosure provide a design for event-triggered L1 measurement reporting for lower layer triggered mobility (LTM) . This may include methods for determining and configuring reference signals for measuring beams of the serving cell, as well as for determining and configuring reference signals for measuring beams of candidate cells. It further describes how the physical (PHY) layer derives L1 measurement results and reports them to the upper layer for each LTM event. Additionally, the present disclosure provides a method for defining LTM events.
[0037] FIG. 1 illustrates that, in some embodiments, one or more user equipments (UEs) 10 and a base station (e.g., next generation NodeB (gNB) or eNB) 20 of communication in a communication network system 30 (e.g., an NR system) according to an embodiment of the present disclosure are provided. The communication network system 30 includes the one or more UEs 10 and the base station 20. The one or more UEs 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12 and the transceiver 13. The base station 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22 and the transceiver 23. The processor 11 or 21 may be configured to implement proposed functions, procedures and / or methods described in this description. Layers of radio interface protocol may be implemented in the processor 11 or 21. The memory 12 or 22 is operatively coupled with the processor 11 or 21 and stores a variety of information to operate the processor 11 or 21. The transceiver 13 or 23 is operatively coupled with the processor 11 or 21, and the transceiver 13 or 23 transmits and / or receives a radio signal.
[0038] The processor 11 or 21 may include application-specific integrated circuit (ASIC) , other chipset, logic circuit and / or data processing device. The memory 12 or 22 may include read-only memory (ROM) , random access memory (RAM) , flash memory, memory card, storage medium and / or other storage device. The transceiver 13 or 23 may include baseband circuitry to process radio frequency signals. When the embodiments are implemented in software, the techniques described herein can be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The modules can be stored in the memory 12 or 22 and executed by the processor 11 or 21. The memory 12 or 22 can be implemented within the processor 11 or 21 or external to the processor 11 or 21 in which case those can be communicatively coupled to the processor 11 or 21 via various means as is known in the art.
[0039] In some embodiments, the processor 11 is configured to operate event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) , and for a candidate cell, the transceiver 13 is configured to receive one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks from the base station 20, and the processor 11 is configured to measure the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell. This can solve issues in the prior art and other issues, reduce an overhead of reference signal, and / or boost a system throughput.
[0040] In some embodiments, the processor 21 is configured to request the UE 10 to operate event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) and for a candidate cell, the transceiver 23 is configured to transmit, to the UE 10, one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks, and the processor 21 is configured to request the UE 10 to measure the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell. This can solve issues in the prior art and other issues, reduce an overhead of reference signal, and / or boost a system throughput.
[0041] FIG. 2 illustrates an example of a UE 200 according to an embodiment of the present application. The UE 200 is configured to implement some embodiments of the disclosure. Some embodiments of the disclosure may be implemented into the UE 200 using any suitably configured hardware and / or software. The UE 200 includes an executor 201 configured to operate event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) and a receiver 202. For a candidate cell, the receiver 202 is configured to receive one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks from a base station, and the executor 201 is configured to measure the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell. This can solve issues in the prior art and other issues, reduce an overhead of reference signal, and / or boost a system throughput.
[0042] FIG. 3 illustrates an example of a UE 300 according to an embodiment of the present disclosure. The UE 300 is configured to implement some embodiments of the disclosure. Some embodiments of the disclosure may be implemented into the UE 300 using any suitably configured hardware and / or software. The UE 300 may include a memory 301, a transceiver 302, and a processor 303 coupled to the memory 301 and the transceiver 302. The processor 303 may be configured to implement proposed functions, procedures and / or methods described in this description. Layers of radio interface protocol may be implemented in the processor 303. The memory 301 is operatively coupled with the processor 303 and stores a variety of information to operate the processor 303. The transceiver 302 is operatively coupled with the processor 303, and the transceiver 302 transmits and / or receives a radio signal. The processor 303 may include application-specific integrated circuit (ASIC) , other chipset, logic circuit and / or data processing device. The memory 301 may include read-only memory (ROM) , random access memory (RAM) , flash memory, memory card, storage medium and / or other storage device. The transceiver 302 may include baseband circuitry to process radio frequency signals. When the embodiments are implemented in software, the techniques described herein can be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The modules can be stored in the memory 301 and executed by the processor 303. The memory 301 can be implemented within the processor 303 or external to the processor 303 in which case those can be communicatively coupled to the processor 303 via various means as is known in the art.
[0043] In some embodiments, the processor 303 is configured to operate event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) , and for a candidate cell, the transceiver 302 is configured to receive one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks from a base station, and the processor 303 is configured to measure the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell. This can solve issues in the prior art and other issues, reduce an overhead of reference signal, and / or boost a system throughput.
[0044] FIG. 4 is an example of a method 400 of wireless communication performed by a UE according to an embodiment of the present disclosure. The method 400 of wireless communication performed by the UE is configured to implement some embodiments of the disclosure. Some embodiments of the disclosure may be implemented into the method 400 of wireless communication performed by the UE using any suitably configured hardware and / or software. In some embodiments, the method 400 of wireless communication performed by the UE includes: an operation 402, operating event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) ; and an operation 404, for a candidate cell, receiving one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks from a base station and measuring the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell. This can solve issues in the prior art and other issues, reduce an overhead of reference signal, and / or boost a system throughput.
[0045] In some embodiments, the method further includes for a serving cell, receiving one or more CSI-RS resources or SS / PBCH blocks from the base station and measuring the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the serving cell. In some embodiments, the UE is configured to derive the one or more CSI-RS resources or SS / PBCH blocks from one or more downlink (DL) transmission configuration indicator (TCI) states in the serving cell. In some embodiments, the method further includes being configured with one or more LTM events. In some embodiments, the one or more LTM events includes at least one of following events: a first LTM event indicating that a L1 measurement of one or more beams of a serving cell is worse than a first absolute threshold; a second LTM event indicating that a L1 measurement of one or more beams of a candidate cell is offset better than a layer 1 reference signal received power (L1-RSRP) measurement of the one or more beams of the serving cell; a third LTM event indicating that the L1 measurement of the one or more beams of the candidate cell is better than a second absolute threshold; or a fourth LTM event indicating that the L1 measurement of the one or more beams of the serving cell is worse than the first absolute threshold and the L1 measurement of the one or more beams of the candidate cell is better than the second absolute threshold.
[0046] In some embodiments, the L1-RSRP measurement is a filtered L1-RSRP measurement. In some embodiments, the UE is provided with a configuration of a filter, and the UE applies the filter on L1-RSRP measurement to obtain the filtered L1-RSRP measurement. In some embodiments, when the one or more LTM events are triggered, the UE reports a corresponding L1 measurement and / or an indication of one or more triggered LTM events. In some embodiments, the corresponding L1 measurement and / or the indication of the one or more triggered LTM events are reported by the UE through a medium access control control-element (MAC-CE) , a physical uplink control channel (PUCCH) , or a physical uplink shared channel (PUSCH) . In some embodiments, the UE is configured to derive the one or more CSI-RS resources or SS / PBCH blocks from one or more DL TCI states in the serving cell.
[0047] FIG. 5 illustrates an example of base station 500 according to an embodiment of the present application. The base station 500 is configured to implement some embodiments of the disclosure. Some embodiments of the disclosure may be implemented into the base station 500 using any suitably configured hardware and / or software. The base station 500 includes an executor 501 configured to configure a user equipment (UE) to operate event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) and a transmitter 502. For a candidate cell, the transmitter 502 is configured to transmit, to the UE, one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks, and the executor 501 is configured to request the UE to measure the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell. This can solve issues in the prior art and other issues, reduce an overhead of reference signal, and / or boost a system throughput.
[0048] FIG. 6 illustrates an example of a base station 600 according to an embodiment of the present disclosure. The base station 600 is configured to implement some embodiments of the disclosure. Some embodiments of the disclosure may be implemented into the base station 600 using any suitably configured hardware and / or software. The base station 600 may include a memory 601, a transceiver 602, and a processor 603 coupled to the memory 601 and the transceiver 602. The processor 603 may be configured to implement proposed functions, procedures and / or methods described in this description. Layers of radio interface protocol may be implemented in the processor 603. The memory 601 is operatively coupled with the processor 603 and stores a variety of information to operate the processor 603. The transceiver 602 is operatively coupled with the processor 603, and the transceiver 602 transmits and / or receives a radio signal. The processor 603 may include application-specific integrated circuit (ASIC) , other chipset, logic circuit and / or data processing device. The memory 601 may include read-only memory (ROM) , random access memory (RAM) , flash memory, memory card, storage medium and / or other storage device. The transceiver 602 may include baseband circuitry to process radio frequency signals. When the embodiments are implemented in software, the techniques described herein can be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The modules can be stored in the memory 601 and executed by the processor 603. The memory 601 can be implemented within the processor 603 or external to the processor 603 in which case those can be communicatively coupled to the processor 603 via various means as is known in the art.
[0049] In some embodiments, the processor 603 is configured to request a UE to operate event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) and for a candidate cell, the transceiver 602 is configured to transmit, to the UE, one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks, and the processor 603 is configured to request the UE to measure the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell. This can solve issues in the prior art and other issues, reduce an overhead of reference signal, and / or boost a system throughput.
[0050] FIG. 7 is an example of a method 700 of wireless communication performed by a base station according to an embodiment of the present disclosure. The method 700 of wireless communication performed by the base station is configured to implement some embodiments of the disclosure. Some embodiments of the disclosure may be implemented into the method 700 of wireless communication performed by the base station using any suitably configured hardware and / or software. In some embodiments, the method 700 of wireless communication performed by the base station includes: an operation 702, configuring a user equipment (UE) to operate event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) ; and an operation 704, for a candidate cell, transmitting, to the UE, one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks, and requesting the UE to measure the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell. This can solve issues in the prior art and other issues, reduce an overhead of reference signal, and / or boost a system throughput.
[0051] In some embodiments, the method further includes for a serving cell, transmitting one or more CSI-RS resources or SS / PBCH blocks to the UE and requesting the UE to measure the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the serving cell. In some embodiments, the base station is configured to request the UE to derive the one or more CSI-RS resources or SS / PBCH blocks from one or more downlink (DL) transmission configuration indicator (TCI) states in the serving cell. In some embodiments, the method further includes configuring, to the UE, one or more LTM events. In some embodiments, the one or more LTM events includes at least one of following events: a first LTM event indicating that a L1 measurement of one or more beams of a serving cell is worse than a first absolute threshold; a second LTM event indicating that a L1 measurement of one or more beams of a candidate cell is offset better than a layer 1 reference signal received power (L1-RSRP) measurement of the one or more beams of the serving cell; a third LTM event indicating that the L1 measurement of the one or more beams of the candidate cell is better than a second absolute threshold; or a fourth LTM event indicating that the L1 measurement of the one or more beams of the serving cell is worse than the first absolute threshold and the L1 measurement of the one or more beams of the candidate cell is better than the second absolute threshold.
[0052] In some embodiments, the L1-RSRP measurement is a filtered L1-RSRP measurement. In some embodiments, the base station provides a configuration of a filter to the UE, and the base station is configured to request the UE to apply the filter on L1-RSRP measurement to obtain the filtered L1-RSRP measurement. In some embodiments, when the one or more LTM events are triggered, the base station receives a corresponding L1 measurement and / or an indication of one or more triggered LTM events from the UE. In some embodiments, the corresponding L1 measurement and / or the indication of the one or more triggered LTM events are received by the base station through a medium access control control-element (MAC-CE) , a physical uplink control channel (PUCCH) , or a physical uplink shared channel (PUSCH) . In some embodiments, the base station is configured to request the UE to derive the one or more CSI-RS resources or SS / PBCH blocks from one or more DL TCI states in the serving cell.
[0053] Exemplary Technical Solutions:
[0054] In some embodiments, a UE can be configured to perform event-triggered L1 measurement and reporting for lower layer triggered mobility (LTM) . The UE may be provided with a list of candidate cells for LTM. For each configured candidate cell, the UE can be provided with one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks, and may be requested to measure these configured CSI-RS resources or SS / PBCH blocks to evaluate the beam (s) of the candidate cell.
[0055] For the serving cell, the UE can be explicitly or implicitly provided with one or more CSI-RS resources or SS / PBCH blocks and may be requested to measure those for evaluating the beam (s) of the serving cell. The UE can also be configured with one or more LTM events.
[0056] For example: A first LTM event may be triggered when the L1 measurement of a beam of the serving cell becomes worse than an absolute threshold. A second LTM event may be triggered when the L1 measurement of a beam of a candidate cell exceeds the L1-RSRP of a serving cell beam by a defined offset. A third LTM event may be triggered when the L1 measurement of a beam of a candidate cell becomes better than an absolute threshold. A fourth LTM event may be triggered when the L1 measurement of a beam of the serving cell becomes worse than a first absolute threshold, and the L1 measurement of a beam of a candidate cell becomes better than a second absolute threshold.
[0057] When one of these LTM events is triggered, the UE may be requested to report the corresponding L1 measurement and / or indicate which LTM event was triggered.
[0058] In some embodiments, the UE can be configured with event-triggered L1 measurement and reporting, and can be requested to obtain reference signals for L1 measurement of beams in the serving cell.
[0059] In one example, the UE can be explicitly provided with one or more CSI-RS resources or SS / PBCH blocks for performing L1 measurement of beams in the serving cell. Each configured CSI-RS resource or SS / PBCH block may correspond to one beam of the serving cell.
[0060] In another example, the UE can be requested to derive a CSI-RS resource or SS / PBCH block based on a jointly configured or downlink (DL) TCI state that is indicated and applied for DL transmission in the serving cell. The CSI-RS resource or SS / PBCH block may serve as a quasi co-location (QCL) source reference signal in the indicated joint or DL TCI state. When two QCL source reference signals are present in the indicated joint or DL TCI state, the CSI-RS resource or SS / PBCH block shall correspond to the QCL-TypeD source RS in that TCI state.
[0061] In yet another example, the UE can be requested to derive CSI-RS resources or SS / PBCH blocks from one or more activated joint or DL TCI states in the serving cell. In this case, the gNB may activate one or more TCI states using a MAC control element (MAC-CE) command, and the UE may be requested to derive CSI-RS resources or SS / PBCH blocks from these activated TCI states. The CSI-RS resources or SS / PBCH blocks may be derived from the QCL source RSs in the activated TCI states. When two QCL source RSs are present in the activated TCI states, the CSI-RS resources or SS / PBCH blocks shall be derived from the QCL-TypeD source RS.
[0062] In some embodiments, the UE can be configured with event-triggered L1 measurement and reporting, and may be requested to obtain reference signals for L1 measurement on beams of a candidate cell.
[0063] In one example, the UE can be explicitly provided with one or more CSI-RS resources or SS / PBCH blocks for performing L1 measurement on beams of a candidate cell. Each configured CSI-RS resource or SS / PBCH block may correspond to one beam of the candidate cell.
[0064] In another example, the UE can be provided with a list of one or more TCI states of the candidate cell, and may be requested to derive a CSI-RS resource or SS / PBCH block from the provided TCI state. The CSI-RS resource or SS / PBCH block may act as a QCL source reference signal in the corresponding TCI state of the candidate cell. When two QCL source reference signals are present in a TCI state, the selected CSI-RS resource or SS / PBCH block shall correspond to the QCL-TypeD source RS within that TCI state.
[0065] In yet another example, the UE can be requested to derive a CSI-RS resource or SS / PBCH block from one or more activated joint or DL TCI states of the candidate cell. In this case, the gNB can activate one or more TCI states via a MAC control element (MAC-CE) command, and the UE may be requested to derive the CSI-RS resource or SS / PBCH block from the activated TCI states. These CSI-RS resources or SS / PBCH blocks may be derived from QCL source RSs within the activated TCI states. If two QCL source RSs are present in the activated TCI states, the CSI-RS resource or SS / PBCH block shall be derived from the QCL-TypeD source RS.
[0066] In some embodiments, the UE can be configured with one or more of the following LTM events. When an LTM event is triggered, the UE can be requested to report the corresponding L1 measurement and / or an indication of the triggered event to the system via, for example, a MAC control element (MAC-CE) , PUCCH, or PUSCH.
[0067] In one example, a first LTM event is triggered when the L1 measurement of a beam of the serving cell becomes worse than an absolute threshold. For this event, the UE can be provided with one or more CSI-RS resources or SS / PBCH blocks that the UE is requested to measure for L1-RSRP. The UE can also be configured with a first threshold for the L1-RSRP measurement and a second hysteresis parameter for the first LTM event. Based on this configuration, the first LTM event is triggered when the L1-RSRP measurement plus the second hysteresis parameter is less than the first threshold, and the event is canceled when the L1-RSRP measurement minus the second hysteresis parameter exceeds the first threshold.
[0068] In one example, a second LTM event is triggered when the L1 measurement of a beam of a candidate cell becomes better than the L1 measurement of a beam of the serving cell by a certain offset. For this event:
[0069] The UE can be provided with one or more CSI-RS resources or SS / PBCH blocks for which it is requested to measure the L1-RSRP of the serving cell. The UE can also be provided with one or more CSI-RS resources or SS / PBCH blocks of one or more candidate cells for measuring their respective L1-RSRPs.
[0070] The UE can be configured with a first offset applicable to candidate cells, a second offset specific to a given candidate cell, a third offset applicable to the serving cell, and a fourth offset specific to the current serving cell. Additionally, the UE can be configured with a fifth offset parameter for the second LTM event.
[0071] A hysteresis parameter can also be provided for the second LTM event.
[0072] The second LTM event is triggered when: L1-RSRP (candidate cell) + first offset + second offset -hysteresis parameter > L1-RSRP (serving cell) + third offset + fourth offset + fifth offset.
[0073] The second LTM event is canceled when: L1-RSRP (candidate cell) + first offset + second offset +hysteresis parameter < L1-RSRP (serving cell) + third offset + fourth offset + fifth offset.
[0074] In one example, a third LTM event is triggered when the L1 measurement of a beam of a candidate cell becomes higher than an absolute threshold. For this event, the UE can be provided with one or more CSI-RS resources or SS / PBCH blocks of a candidate cell, which the UE is requested to measure for L1-RSRP. The UE may also be provided with CSI-RS resources or SS / PBCH blocks for one or more candidate cells, and be requested to measure the L1-RSRP for each of those CSI-RS resources or SS / PBCH blocks.
[0075] The UE can be configured with a first threshold for the L1-RSRP measurement, and a second hysteresis parameter for the third LTM event. Under this configuration, the third LTM event for a candidate cell is triggered when: L1-RSRP (CSI-RS or SS / PBCH of the candidate cell) -hysteresis parameter > first threshold, and / or the third LTM event for that candidate cell is canceled when: L1-RSRP (CSI-RS or SS / PBCH of the candidate cell) + hysteresis parameter < first threshold.
[0076] In one example, a fourth LTM event is triggered when the L1 measurement of a CSI-RS or SS / PBCH block (SSB) of the serving cell becomes worse than a first threshold, and / or the L1 measurement of a CSI-RS or SSB of a candidate cell becomes better than a second absolute threshold.
[0077] For this event, the UE can be provided with one or more CSI-RS resources or SS / PBCH blocks for which it is requested to measure the L1-RSRP of the serving cell. The UE can be configured with a first threshold corresponding to the L1-RSRP measurement of the serving cell.
[0078] Additionally, the UE can be provided with one or more CSI-RS resources or SS / PBCH blocks of a candidate cell for measuring its L1-RSRP. The UE may also be provided with CSI-RS resources or SS / PBCH blocks of one or more candidate cells and be requested to measure the L1-RSRP of each. The UE can be configured with a first offset for candidate cells, a second offset for a specific candidate cell, and a second threshold for the L1-RSRP measurement of the candidate cell.
[0079] The UE can also be configured with a hysteresis parameter for the fourth LTM event.
[0080] The fourth LTM event is triggered when: (i) the L1-RSRP measurement of the CSI-RS or SSB of the serving cell plus the hysteresis parameter is less than the first threshold; and / or (ii) the L1-RSRP measurement of the CSI-RS or SSB of a candidate cell plus the first offset plus the second offset minus the hysteresis parameter is greater than the second threshold.
[0081] The fourth LTM event is canceled when: (i) the L1-RSRP measurement of the CSI-RS or SSB of the serving cell minus the hysteresis parameter is greater than the first threshold; and / or (ii) the L1-RSRP measurement of the CSI-RS or SSB of a candidate cell plus the first offset plus the second offset plus the hysteresis parameter is less than the second threshold.
[0082] In summary, in the above methods and examples, the L1-RSRP measurement can be a filtered L1-RSRP measurement. The UE can be provided with a configuration of the filter and may be requested to apply the indicated filter to the L1-RSRP measurement in order to obtain a filtered L1-RSRP measurement.
[0083] Commercial interests for some embodiments are as follows. 1. Solve issues in the prior art and other issues. 2. Reduce an overhead of reference signal. 3. Boost a system throughput. 4. Provide a good communication performance. 5. Provide high reliability. Some embodiments of the present disclosure can be used in many applications. Some embodiments of the present disclosure are used by chipset vendors, video system development vendors, automakers including cars, trains, trucks, buses, bicycles, moto-bikes, helmets, and etc., drones (unmanned aerial vehicles) , smartphone makers, communication devices for public safety use, AR / VR / MR device maker for example gaming, conference / seminar, education purposes. Some embodiments of the present disclosure are a combination of “techniques / processes” that can be adopted in video standards to create an end product. Some embodiments of the present disclosure propose technical mechanisms. The at least one proposed solution, method, system, and apparatus of some embodiments of the present disclosure may be used for current and / or new / future standards regarding communication systems such as a UE, a base station, and / or a communication system. Compatible products follow at least one proposed solution, method, system, and apparatus of some embodiments of the present disclosure. The proposed solution, method, system, and apparatus are widely used in a UE, a base station, and / or a communication system. With the implementation of the at least one proposed solution, method, system, and apparatus of some embodiments of the present disclosure, at least one modification to methods and apparatus of wireless communication are considered for standardizing.
[0084] FIG. 8 is an example of a computing device 1100 according to an embodiment of the present disclosure. Any suitable computing device can be used for performing the operations described herein. For example, FIG. 8 illustrates an example of the computing device 1100 that can implement some embodiments of FIG. 1 to FIG. 7 using any suitably configured hardware and / or software. In some embodiments, the computing device 1100 can include a processor 1112 that is communicatively coupled to a memory 1114 and that executes computer-executable program code and / or accesses information stored in the memory 1114. The processor 1112 may include a microprocessor, an application-specific integrated circuit ( “ASIC” ) , a state machine, or other processing device. The processor 1112 can include any of a number of processing devices, including one. Such a processor can include or may be in communication with a computer-readable medium storing instructions that, when executed by the processor 1112, cause the processor to perform the operations described herein.
[0085] The memory 1114 can include any suitable non-transitory computer-readable medium. The computer-readable medium can include any electronic, optical, magnetic, or other storage device capable of providing a processor with computer-readable instructions or other program code. Non-limiting examples of a computer-readable medium include a magnetic disk, a memory chip, a read-only memory (ROM) , a random access memory (RAM) , an application specific integrated circuit (ASIC) , a configured processor, optical storage, magnetic tape or other magnetic storage, or any other medium from which a computer processor can read instructions. The instructions may include processor-specific instructions generated by a compiler and / or an interpreter from code written in any suitable computer-programming language, including, for example, C, C++, C#, visual basic, java, python, perl, javascript, and actionscript.
[0086] The computing device 1100 can also include a bus 1116. The bus 1116 can communicatively couple one or more components of the computing device 1100. The computing device 1100 can also include a number of external or internal devices such as input or output devices. For example, the computing device 1100 is illustrated with an input / output ( “I / O” ) interface 1118 that can receive input from one or more input devices 1120 or provide output to one or more output devices 1122. The one or more input devices 1120 and one or more output devices 1122 can be communicatively coupled to the I / O interface 1118. The communicative coupling can be implemented via any suitable manner (e.g., a connection via a printed circuit board, connection via a cable, communication via wireless transmissions, etc. ) . Non-limiting examples of input devices 1120 include a touch screen (e g., one or more cameras for imaging a touch area or pressure sensors for detecting pressure changes caused by a touch) , a mouse, a keyboard, or any other device that can be used to generate input events in response to physical actions by a user of a computing device. Non-limiting examples of output devices 1122 include a liquid crystal display (LCD) screen, an external monitor, a speaker, or any other device that can be used to display or otherwise present outputs generated by a computing device.
[0087] The computing device 1100 can execute program code that configures the processor 1112 to perform one or more of the operations described above with respect to some embodiments of FIG. 1 to FIG. 7. The program code may be resident in the memory 1114 or any suitable computer-readable medium and may be executed by the processor 1112 or any other suitable processor.
[0088] The computing device 1100 can also include at least one network interface device 1124. The network interface device 1124 can include any device or group of devices suitable for establishing a wired or wireless data connection to one or more data networks 1128. Non limiting examples of the network interface device 1124 include an Ethernet network adapter, a modem, and / or the like. The computing device 1100 can transmit messages as electronic or optical signals via the network interface device 1124.
[0089] FIG. 9 is a block diagram of an example of a communication system 1200 according to an embodiment of the present disclosure. Embodiments described herein may be implemented into the communication system 1200 using any suitably configured hardware and / or software. FIG. 9 illustrates the communication system 1200 including a radio frequency (RF) circuitry 1210, a baseband circuitry 1220, an application circuitry 1230, a memory / storage 1240, a display 1250, a camera 1260, a sensor 1270, and an input / output (I / O) interface 1280, coupled with each other at least as illustrated.
[0090] The application circuitry 1230 may include a circuitry such as, but not limited to, one or more single-core or multi-core processors. The processors may include any combination of general-purpose processors and dedicated processors, such as graphics processors, application processors. The processors may be coupled with the memory / storage and configured to execute instructions stored in the memory / storage to enable various applications and / or operating systems running on the system. The communication system 1200 can execute program code that configures the application circuitry 1230 to perform one or more of the operations described above with respect to some embodiments of FIG. 1 to FIG. 7. The program code may be resident in the application circuitry 1230 or any suitable computer-readable medium and may be executed by the application circuitry 1230 or any other suitable processor.
[0091] The baseband circuitry 1220 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processors may include a baseband processor. The baseband circuitry may handle various radio control functions that may enable communication with one or more radio networks via the RF circuitry. The radio control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, etc. In some embodiments, the baseband circuitry may provide for communication compatible with one or more radio technologies. For example, in some embodiments, the baseband circuitry may support communication with an evolved universal terrestrial radio access network (EUTRAN) and / or other wireless metropolitan area networks (WMAN) , a wireless local area network (WLAN) , a wireless personal area network (WPAN) . Embodiments in which the baseband circuitry is configured to support radio communications of more than one wireless protocol may be referred to as multi-mode baseband circuitry.
[0092] In various embodiments, the baseband circuitry 1220 may include circuitry to operate with signals that are not strictly considered as being in a baseband frequency. For example, in some embodiments, baseband circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency. The RF circuitry 1210 may enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium. In various embodiments, the RF circuitry may include switches, filters, amplifiers, etc. to facilitate the communication with the wireless network. In various embodiments, the RF circuitry 1210 may include circuitry to operate with signals that are not strictly considered as being in a radio frequency. For example, in some embodiments, RF circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency.
[0093] In various embodiments, the transmitter circuitry, control circuitry, or receiver circuitry discussed above with respect to some embodiments of FIG. 1 to FIG. 7 may be embodied in whole or in part in one or more of the RF circuitry, the baseband circuitry, and / or the application circuitry. As used herein, “circuitry” may refer to, be part of, or include an application specific integrated circuit (ASIC) , an electronic circuit, a processor (shared, dedicated, or group) , and / or a memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and / or other suitable hardware components that provide the described functionality. In some embodiments, the electronic device circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules. In some embodiments, some or all of the constituent components of the baseband circuitry, the application circuitry, and / or the memory / storage may be implemented together on a system on a chip (SOC) . The memory / storage 1240 may be used to load and store data and / or instructions, for example, for system. The memory / storage for one embodiment may include any combination of suitable volatile memory, such as dynamic random access memory (DRAM) ) , and / or non-volatile memory, such as flash memory.
[0094] In various embodiments, the I / O interface 1280 may include one or more user interfaces designed to enable user interaction with the system and / or peripheral component interfaces designed to enable peripheral component interaction with the system. User interfaces may include, but are not limited to a physical keyboard or keypad, a touchpad, a speaker, a microphone, etc. Peripheral component interfaces may include, but are not limited to, a non-volatile memory port, a universal serial bus (USB) port, an audio jack, and a power supply interface. In various embodiments, the sensor 1270 may include one or more sensing devices to determine environmental conditions and / or location information related to the system. In some embodiments, the sensors may include, but are not limited to, a gyro sensor, an accelerometer, a proximity sensor, an ambient light sensor, and a positioning unit. The positioning unit may also be part of, or interact with, the baseband circuitry and / or RF circuitry to communicate with components of a positioning network, e.g., a global positioning system (GPS) satellite.
[0095] In various embodiments, the display 1250 may include a display, such as a liquid crystal display and a touch screen display. In various embodiments, the communication system 1200 may be a mobile computing device such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, an ultrabook, a smartphone, an AR / VR glasses, etc. In various embodiments, system may have more or less components, and / or different architectures. Where appropriate, methods described herein may be implemented as a computer program. The computer program may be stored on a storage medium, such as a non-transitory storage medium.
[0096] A person having ordinary skill in the art understands that each of the units, algorithm, and operations described and disclosed in the embodiments of the present disclosure are realized using electronic hardware or combinations of software for computers and electronic hardware. Whether the functions run in hardware or software depends on the condition of application and design requirement for a technical plan. A person having ordinary skill in the art can use different ways to realize the function for each specific application while such realizations should not go beyond the scope of the present disclosure. It is understood by a person having ordinary skill in the art that he / she can refer to the working processes of the system, device, and unit in the above-mentioned embodiment since the working processes of the above-mentioned system, device, and unit are basically the same. For easy description and simplicity, these working processes will not be detailed.
[0097] It is understood that the disclosed system, device, and method in the embodiments of the present disclosure can be realized with other ways. The above-mentioned embodiments are exemplary only. The division of the units is merely based on logical functions while other divisions exist in realization. It is possible that a plurality of units or components are combined or integrated in another system. It is also possible that some characteristics are omitted or skipped. On the other hand, the displayed or discussed mutual coupling, direct coupling, or communicative coupling operate through some ports, devices, or units whether indirectly or communicatively by ways of electrical, mechanical, or other kinds of forms.
[0098] The units as separating components for explanation are or are not physically separated. The units for display are or are not physical units, that is, located in one place or distributed on a plurality of network units. Some or all of the units are used according to the purposes of the embodiments. Moreover, each of the functional units in each of the embodiments can be integrated in one processing unit, physically independent, or integrated in one processing unit with two or more than two units.
[0099] If the software function unit is realized and used and sold as a product, it can be stored in a readable storage medium in a computer. Based on this understanding, the technical plan proposed by the present disclosure can be essentially or partially realized as the form of a software product. Or, one part of the technical plan beneficial to the conventional technology can be realized as the form of a software product. The software product in the computer is stored in a storage medium, including a plurality of commands for a computational device (such as a personal computer, a server, or a network device) to run all or some of the operations disclosed by the embodiments of the present disclosure. The storage medium includes a USB disk, a mobile hard disk, a read-only memory (ROM) , a random access memory (RAM) , a floppy disk, or other kinds of media capable of storing program codes.
[0100] While the present disclosure has been described in connection with what is considered the most practical and preferred embodiments, it is understood that the present disclosure is not limited to the disclosed embodiments but is intended to cover various arrangements made without departing from the scope of the broadest interpretation of the appended claims.
Claims
1.A method of wireless communication performed by a user equipment (UE) , comprising:operating event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) ; and for a candidate cell, receiving one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks from a base station and measuring the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell.2.The method of claim 1, further comprising:for a serving cell, receiving one or more CSI-RS resources or SS / PBCH blocks from the base station and measuring the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the serving cell.3.The method of claim 2, wherein the UE is configured to derive the one or more CSI-RS resources or SS / PBCH blocks from one or more downlink (DL) transmission configuration indicator (TCI) states in the serving cell.4.The method of any one of claims 1 to 3, further comprising:being configured with one or more LTM events.5.The method of claim 4, wherein the one or more LTM events comprises at least one of following events:a first LTM event indicating that a L1 measurement of one or more beams of a serving cell is worse than a first absolute threshold;a second LTM event indicating that a L1 measurement of one or more beams of a candidate cell is offset better than a layer 1 reference signal received power (L1-RSRP) measurement of the one or more beams of the serving cell;a third LTM event indicating that the L1 measurement of the one or more beams of the candidate cell is better than a second absolute threshold; ora fourth LTM event indicating that the L1 measurement of the one or more beams of the serving cell is worse than the first absolute threshold and the L1 measurement of the one or more beams of the candidate cell is better than the second absolute threshold.6.The method of claim 5, wherein the L1-RSRP measurement is a filtered L1-RSRP measurement.7.The method of claim 6, wherein the UE is provided with a configuration of a filter, and the UE applies the filter on L1-RSRP measurement to obtain the filtered L1-RSRP measurement.8.The method of any one of claims 4 to 7, wherein when the one or more LTM events are triggered, the UE reports a corresponding L1 measurement and / or an indication of one or more triggered LTM events.9.The method of claim 8, wherein the corresponding L1 measurement and / or the indication of the one or more triggered LTM events are reported by the UE through a medium access control control-element (MAC-CE) , a physical uplink control channel (PUCCH) , or a physical uplink shared channel (PUSCH) .10.The method of any one of claims 1 to 9, wherein the UE is configured to derive the one or more CSI-RS resources or SS / PBCH blocks from one or more DL TCI states in the serving cell.11.A method of wireless communication performed by a base station, comprising:configuring a user equipment (UE) to operate event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) ; andfor a candidate cell, transmitting, to the UE, one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks, and requesting the UE to measure the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell.12.The method of claim 11, further comprising:for a serving cell, transmitting one or more CSI-RS resources or SS / PBCH blocks to the UE and requesting the UE to measure the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the serving cell.13.The method of claim 12, wherein the base station is configured to request the UE to derive the one or more CSI-RS resources or SS / PBCH blocks from one or more downlink (DL) transmission configuration indicator (TCI) states in the serving cell.14.The method of any one of claims 11 to 13, further comprising:configuring, to the UE, one or more LTM events.15.The method of claim 14, wherein the one or more LTM events comprises at least one of following events:a first LTM event indicating that a L1 measurement of one or more beams of a serving cell is worse than a first absolute threshold;a second LTM event indicating that a L1 measurement of one or more beams of a candidate cell is offset better than a layer 1 reference signal received power (L1-RSRP) measurement of the one or more beams of the serving cell;a third LTM event indicating that the L1 measurement of the one or more beams of the candidate cell is better than a second absolute threshold; ora fourth LTM event indicating that the L1 measurement of the one or more beams of the serving cell is worse than the first absolute threshold and the L1 measurement of the one or more beams of the candidate cell is better than the second absolute threshold.16.The method of claim 15, wherein the L1-RSRP measurement is a filtered L1-RSRP measurement.17.The method of claim 16, wherein the base station provides a configuration of a filter to the UE, and the base station is configured to request the UE to apply the filter on L1-RSRP measurement to obtain the filtered L1-RSRP measurement.18.The method of any one of claims 14 to 17, wherein when the one or more LTM events are triggered, the base station receives a corresponding L1 measurement and / or an indication of one or more triggered LTM events from the UE.19.The method of claim 18, wherein the corresponding L1 measurement and / or the indication of the one or more triggered LTM events are received by the base station through a medium access control control-element (MAC-CE) , a physical uplink control channel (PUCCH) , or a physical uplink shared channel (PUSCH) .20.The method of any one of claims 11 to 19, wherein the base station is configured to request the UE to derive the one or more CSI-RS resources or SS / PBCH blocks from one or more DL TCI states in the serving cell.21.A user equipment (UE) , comprising:an executor configured to operate event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) ; anda receiver, wherein for a candidate cell, the receiver is configured to receive one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks from a base station, and the executor is configured to measure the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell.22.A base station, comprising:an executor configured to request a user equipment (UE) to operate event-triggered layer 1 (L1) measurement and report for lower layer triggered mobility (LTM) ; anda transmitter, wherein for a candidate cell, the transmitter is configured to transmit, to the UE, one or more channel state information reference signal (CSI-RS) resources or synchronization signal / physical broadcast channel (SS / PBCH) blocks, and the executor is configured to request the UE to measure the one or more CSI-RS resources or SS / PBCH blocks for measurement of one or more beams of the candidate cell.23.A user equipment (UE) , comprising:a memory;a transceiver; anda processor coupled to the memory and the transceiver;wherein the UE is configured to perform the method of any one of claims 1 to 10.24.A base station, comprising:a memory;a transceiver; anda processor coupled to the memory and the transceiver;wherein the base station is configured to perform the method of any one of claims 11 to 20.25.A non-transitory machine-readable storage medium having stored thereon instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 20.26.A chip, comprising:a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the method of any one of claims 1 to 20.27.A computer readable storage medium, in which a computer program is stored, wherein the computer program causes a computer to execute the method of any one of claims 1 to 20.28.A computer program product, comprising a computer program, wherein the computer program causes a computer to execute the method of any one of claims 1 to 20.29.A computer program, wherein the computer program causes a computer to execute the method of any one of claims 1 to 20.
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