Methods and devices for l1 measurement reporting
By configuring L1 measurements and synchronization for UE, the system addresses L1 measurement report challenges, enhancing LTM efficiency and performance for faster wireless communication.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- ZTE CORP
- Filing Date
- 2025-03-27
- Publication Date
- 2026-06-11
AI Technical Summary
Existing wireless communication systems face challenges in determining the content and format of Layer 1 (L1) measurement reports, which are crucial for efficient Layer 1/Layer 2 signaling triggered mobility (LTM) to reduce handover delay and signaling overhead.
The system configures user equipment (UE) to perform L1 measurements on serving and neighbor cells, sending L1 measurement reports via MAC CE, and includes early downlink and uplink synchronization mechanisms to facilitate fast cell switching, reducing latency through pre-configured LTM candidate configurations and RACH-less procedures.
Enhances the efficiency and performance of LTM, enabling faster and more reliable wireless communication by optimizing L1 measurement reporting, thus meeting the demands of new generation wireless services.
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Figure CN2025085272_11062026_PF_FP_ABST
Abstract
Description
METHODS AND DEVICES FOR L1 MEASUREMENT REPORTINGTECHNICAL FIELD
[0001] The present disclosure is directed generally to wireless communications. Particularly, the present disclosure relates to methods and devices for L1 measurement reporting in a mobile communication system.BACKGROUND
[0002] Wireless communication technologies are moving the world toward an increasingly connected and networked society. High-speed and low-latency wireless communications rely on efficient network resource management and allocation between user equipment and wireless access network nodes (including but not limited to base stations) . A new generation network is expected to provide high speed, low latency and ultra-reliable communication capabilities and fulfill the requirements from different industries and users.
[0003] In a wireless communication system, Layer 1 / Layer 2 signaling triggered mobility (LTM) may be an important technology to perform fast serving cell change compared to a legacy handover, as the LTM may dramatically reduce the handover delay. To enable fast cell switch, the network can pre-configure multiple LTM candidate configurations based on a Layer 1 (L1) measurement report, to reduce signaling overhead, the configuration can also be provided based on a reference configuration. However, there are some challengers / problems associates with L1 measurement reporting. For example, the content of the L1 measurement report need to be determined, and / or the format of the L1 measurement report need to be configured as well.
[0004] The present disclosure describes various embodiments for L1 measurement reporting in a mobile communication system, addressing at least one of the challenges / problems discussed in the present disclosure, thus increasing efficiency of LTM, enabling future wireless communication system to provide improved performance to meet various demands of new generation wireless services in wireless communication systems.SUMMARY
[0005] This document relates to methods, systems, and devices for wireless communication, and more specifically, for L1 measurement reporting in a mobile communication system. The various embodiments in the present disclosure may be beneficial to enhance efficiency and performance of LTM, and / or boost performance of the wireless data service via wireless communication., increase the overall transmission efficiency and speed, and / or boost performance of the wireless communication.
[0006] In one embodiment, the present disclosure describes a method in a wireless communication system, performed by a wireless communication device (e.g., a UE) . The method includes receiving, by a user equipment (UE) from a base station, a first message comprising a L1 measurement reporting configuration; and sending, by the UE based on the L1 measurement reporting configuration, a second message comprising a L1 measurement report medium access control (MAC) control element (CE) to the base station. In some implementations, the L1 measurement report MAC CE comprises information for one or more reported beams.
[0007] In one embodiment, the present disclosure describes another method in a wireless communication system, performed by a base station. The method includes sending, by base station to a user equipment (UE) , a first message comprising a L1 measurement reporting configuration; and receiving, by the base station from the UE based on the L1 measurement reporting configuration, a second message comprising a L1 measurement report medium access control (MAC) control element (CE) . In some implementations, the L1 measurement report MAC CE comprises information for one or more reported beams.
[0008] In some other embodiments, an apparatus for wireless communication may include a memory storing instructions and at least one processing circuitry in communication with the memory. When the at least one processing circuitry executes the instructions, the at least one processing circuitry is configured to carry out any of the methods above and / or in the present disclosure.
[0009] In some other embodiments, a device for wireless communication may include a memory storing instructions and at least one processing circuitry in communication with the memory. When the at least one processing circuitry executes the instructions, the at least one processing circuitry is configured to carry out any of the methods above and / or in the present disclosure.
[0010] In some other embodiments, a computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the methods above and / or in the present disclosure. The computer-readable medium may be a non-transitory computer-readable medium.
[0011] In some other embodiments, a computer program product comprising a computer-readable program medium code stored thereupon, the computer-readable program medium code, when executed by at least one processor, causing the at least one processor to implement any of the methods above and / or in the present disclosure. The computer program product may be a non-transitory computer program product. The computer-readable program medium code may be a non-transitory computer-readable program code.
[0012] The above and other aspects and their implementations are described in greater detail in the drawings, the descriptions, and the claims.BRIEF DESCRIPTION OF THE DRAWINGS
[0013] FIG. 1 illustrates an example wireless communication network including a wireless access network, a core network, and data networks.
[0014] FIG. 2 shows an example of a network node.
[0015] FIG. 3 shows an example of a user equipment.
[0016] FIG. 4 shows an example radio access network (RAN) architecture.
[0017] FIG. 5 shows an example communication protocol stack in a wireless access network node or wireless terminal device including various network layers.
[0018] FIG. 6A shows a flow diagram of a method for wireless communication.
[0019] FIG. 6B shows a flow diagram of another method for wireless communication.
[0020] FIG. 7A shows a schematic diagram of one exemplary embodiment in the present disclosure.
[0021] FIG. 7B shows a schematic diagram of another exemplary embodiment in the present disclosure.
[0022] FIG. 7C shows a schematic diagram of another exemplary embodiment in the present disclosure.
[0023] FIG. 8A shows a schematic diagram of another exemplary embodiment in the present disclosure.
[0024] FIG. 8B shows a schematic diagram of another exemplary embodiment in the present disclosure.
[0025] FIG. 8C shows a schematic diagram of another exemplary embodiment in the present disclosure.
[0026] FIG. 9A shows a schematic diagram of another exemplary embodiment in the present disclosure.
[0027] FIG. 9B shows a schematic diagram of another exemplary embodiment in the present disclosure.DETAILED DESCRIPTION
[0028] The present disclosure will now be described in detail hereinafter with reference to the accompanied drawings, which form a part of the present disclosure, and which show, by way of illustration, specific examples of embodiments. Please note that the present disclosure may, however, be embodied in a variety of different forms and, therefore, the covered or claimed subject matter is intended to be construed as not being limited to any of the embodiments to be set forth below.
[0029] Throughout the specification and claims, terms may have nuanced meanings suggested or implied in context beyond an explicitly stated meaning. Likewise, the phrase “in one embodiment” or “in some embodiments” as used herein does not necessarily refer to the same embodiment and the phrase “in another embodiment” or “in other embodiments” as used herein does not necessarily refer to a different embodiment. The phrase “in one implementation” or “in some implementations” as used herein does not necessarily refer to the same implementation and the phrase “in another implementation” or “in other implementations” as used herein does not necessarily refer to a different implementation. It is intended, for example, that claimed subject matter includes combinations of exemplary embodiments or implementations in whole or in part.
[0030] In general, terminology may be understood at least in part from usage in context. For example, terms, such as “and” , “or” , or “and / or, ” as used herein may include a variety of meanings that may depend at least in part upon the context in which such terms are used. Typically, “or” if used to associate a list, such as A, B or C, is intended to mean A, B, and C, here used in the inclusive sense, as well as A, B or C, here used in the exclusive sense. In addition, the term “one or more” or “at least one” as used herein, depending at least in part upon context, may be used to describe any feature, structure, or characteristic in a singular sense or may be used to describe combinations of features, structures or characteristics in a plural sense. Similarly, terms, such as “a” , “an” , or “the” , again, may be understood to convey a singular usage or to convey a plural usage, depending at least in part upon context. In addition, the term “based on” or “determined by” may be understood as not necessarily intended to convey an exclusive set of factors and may, instead, allow for existence of additional factors not necessarily expressly described, again, depending at least in part on context.
[0031] Wireless technologies are moving the world toward an increasingly connected and networked society. High-speed and low-latency wireless communication system rely on efficient network resource management and allocation between user equipment and wireless access network nodes (including but not limited to base stations and / or core networks) . New generation networks are expected to provide various data services, in addition to conventional communication service, with high speed, low latency, and highly reliable capabilities, so as to fulfill requirements under various circumstances.
[0032] In a wireless communication system may be an important technology to perform fast serving cell change compared to a legacy handover, as the legacy handover may dramatically reduce the handover delay. Unlike traditional Layer 3 (radio resource control (RRC) layer) based handover, LTM leverages L1 / L2 signalling to initiate mobility procedures, reducing mobility delay and signaling overhead. The LTM procedure may include several following characteristics.
[0033] In some implementations for per-configuration of LTM candidates, to enable fast cell switch, a network can pre-configure multiple LTM candidate configurations, to reduce signaling overhead, the configuration can also be provided based on a reference configuration. Upon LTM execution, the network can send L2 LTM cell switch medium access control (MAC) control element (CE) to inform a user equipment (UE) to apply a pre-configured LTM candidate.
[0034] In some implementations for L1 measurements and reporting, a traditional L3 (RRC) based handover is usually triggered based on L3 measurement report, but for LTM, the UE can be configured to perform L1 measurements on both serving and neighbour cells, then the UE sends L1 measurement report periodically, or semi-persisitently, or aperiodically, or when a specific event is considered to be met. For event-based L1 measurement reporting, the L1 measurement report may be sent to the network via a MAC CE.
[0035] In some implementations for early downlink (DL) Synchronization, to reduce latency, before LTM execution, the network can configure and activate transmission configuration indication (TCI) states for candidate cells, allowing the UE to maintain downlink synchronization with these cells. Additionally, the network can also include the TCI-state in LTM cell switch MAC CE to indicate the activated beam for target cell upon LTM.
[0036] In some implementations for early uplink (UL) Synchronization, to reduce latency, RACH-less based LTM is supported, this allows the UE to complete uplink synchronization in advance without going through the standard random access channel (RACH) procedure. To achieve this, LTM introduces a physical downlink control channel (PDCCH) ordered RACH mechanism, where the network triggers the UE to acquire the timing advance (TA) of the target cell through PDCCH. Additionally, the network can also configure the UE to enable “UE-based TA” , so the capable UE can acquire the TA of the target cell based on UE’s calculation before LTM execution.
[0037] In some implementations, from network perspective, a network may trigger early DL / UL synchronization based on received L1 measurement report. In some implementations (e.g., 5G NR) for a L1 measurement report, in case of event-based L1 measurement reporting, the UE is required to send the report to the network via MAC CE.
[0038] There are some challenges / problems associates with L1 measurement reporting. For example, content of the L1 measurement report need to be determined, and / or format of the L1 measurement report need to be configured as well.
[0039] The present disclosure describes various embodiments for L1 measurement reporting in a mobile communication system, addressing at least one of the challenges / problems discussed in the present disclosure, thus increasing efficiency of LTM, enabling future wireless communication system to provide improved performance to meet various demands of new generation wireless services in wireless communication systems.
[0040] An example wireless communication system, shown as 100 in FIG. 1, may include wireless terminal devices or user equipment (UE) 110, 111, and 112, a carrier network 102, various service applications 140, and other data networks 150. The wireless terminal devices or UEs, may be alternatively referred to as wireless terminals. The carrier network 102, for example, may include access network nodes 120 and 121, and a core network 130. The carrier network 110 may be configured to transmit voice, data, and other information (collectively referred to as data traffic) among UEs 110, 111, and 112, between the UEs and the service applications 140, or between the UEs and the other data networks 150. The access network nodes 120 and 121 may be configured as various wireless access network nodes (WANNs, alternatively referred to as wireless base stations) to interact with the UEs on one side of a communication session and the core network 130 on the other. The term “access network” may be used more broadly to refer a combination of the wireless terminal devices 110, 111, and 112 and the access network nodes 120 and 121. A wireless access network may be alternatively referred to as Radio Access Network (RAN) . The core network 130 may include various network nodes configured to control communication sessions and perform network access management and traffic routing. The service applications 140 may be hosted by various application servers deployed outside of but connected to the core network 130. Likewise, the other data networks 150 may also be connected to the core network 130. In one implementation, the core network 130 may include a 5G core network (5GC) , whose interface may include a new generation (NG) interface.
[0041] In some implementations, the core network 130 further includes at least one location management function (LMF) , and / or at least one session management function (SMF) , and / or at least one user plane function (UPF) and / or at least one access and mobility management Function (AMF) , and / or etc.
[0042] In the example wireless communication network of 100 of FIG. 1, the UEs may communicate with one another via the wireless access network. For example, UE 110 and 112 may be connected to and communicate via the same access network node 120. The UEs may communicate with one another via both the access networks and the core network. For example, UE 110 may be connected to the access network node 120 whereas UE 111 may be connected to the access network node 121, and as such, the UE 110 and UE 111 may communicate to one another via the access network nodes 120 and 121, and the core network 130. The UEs may further communicate with the service applications 140 and the data networks 150 via the core network 130. Further, the UEs may communicate to one another directly via side link communications, as shown by 113.
[0043] FIG. 2 shows an example of electronic device 200 to implement a RAN. A core network may include a portion of the structure as shown in FIG. 2. The example electronic device 200 may include radio transmitting / receiving (Tx / Rx) circuitry 208 to transmit / receive communication with UEs and / or other base stations. The electronic device 200 may also include network interface circuitry 209 to communicate the base station with other base stations and / or a core network, e.g., optical or wireline interconnects, Ethernet, and / or other data transmission mediums / protocols. The electronic device 200 may optionally include an input / output (I / O) interface 206 to communicate with an operator or the like.
[0044] The electronic device 200 may also include system circuitry 204. System circuitry 204 may include processor (s) 221 and / or memory 222. Memory 222 may include an operating system 224, instructions 226, and parameters 228. Instructions 226 may be configured for the one or more of the processors 221 to perform the functions of the network node. The parameters 228 may include parameters to support execution of the instructions 226. For example, parameters may include network protocol settings, bandwidth parameters, radio frequency mapping assignments, and / or other parameters.
[0045] FIG. 3 shows an example of an electronic device to implement a terminal device 300 (for example, user equipment (UE) ) . The UE 300 may be a mobile device, for example, a smart phone or a mobile communication module disposed in a vehicle. The UE 300 may include communication interfaces 302, a system circuitry 304, an input / output interfaces (I / O) 306, a display circuitry 308, and a storage 309. The display circuitry may include a user interface 310. The system circuitry 304 may include any combination of hardware, software, firmware, or other logic / circuitry. The system circuitry 304 may be implemented, for example, with one or more systems on a chip (SoC) , application specific integrated circuits (ASIC) , discrete analog and digital circuits, and other circuitry. The system circuitry 304 may be a part of the implementation of any desired functionality in the UE 300. In that regard, the system circuitry 304 may include logic that facilitates, as examples, decoding and playing music and video, e.g., MP3, MP4, MPEG, AVI, FLAC, AC3, or WAV decoding and playback; running applications; accepting user inputs; saving and retrieving application data; establishing, maintaining, and terminating cellular phone calls or data connections for, as one example, internet connectivity; establishing, maintaining, and terminating wireless network connections, Bluetooth connections, or other connections; and displaying relevant information on the user interface 310. The user interface 310 and the inputs / output (I / O) interfaces 306 may include a graphical user interface, touch sensitive display, haptic feedback or other haptic output, voice or facial recognition inputs, buttons, switches, speakers and other user interface elements. Additional examples of the I / O interfaces 306 may include microphones, video and still image cameras, temperature sensors, vibration sensors, rotation and orientation sensors, headset and microphone input / output jacks, Universal Serial Bus (USB) connectors, memory card slots, radiation sensors (e.g., IR sensors) , and other types of inputs.
[0046] Referring to FIG. 3, the communication interfaces 302 may include a Radio Frequency (RF) transmit (Tx) and receive (Rx) circuitry 316 which handles transmission and reception of signals through one or more antennas 314. The communication interface 302 may include one or more transceivers. The transceivers may be wireless transceivers that include modulation / demodulation circuitry, digital to analog converters (DACs) , shaping tables, analog to digital converters (ADCs) , filters, waveform shapers, filters, pre-amplifiers, power amplifiers and / or other logic for transmitting and receiving through one or more antennas, or (for some devices) through a physical (e.g., wireline) medium. The transmitted and received signals may adhere to any of a diverse array of formats, protocols, modulations (e.g., QPSK, 16-QAM, 64-QAM, or 256-QAM) , frequency channels, bit rates, and encodings. As one specific example, the communication interfaces 302 may include transceivers that support transmission and reception under the 2G, 3G, BT, WiFi, Universal Mobile Telecommunications System (UMTS) , High Speed Packet Access (HSPA) +, 4G / Long Term Evolution (LTE) , 5G standards, 6G, and / or any further generation standards. The techniques described below, however, are applicable to other wireless communications technologies whether arising from the 3rd Generation Partnership Project (3GPP) , GSM Association, 3GPP2, IEEE, or other partnerships or standards bodies.
[0047] Referring to FIG. 3, the system circuitry 304 may include one or more processors 321 and memories 322. The memory 322 stores, for example, an operating system 324, instructions 326, and parameters 328. The processor 321 is configured to execute the instructions 326 to carry out desired functionality for the UE 300. The parameters 328 may provide and specify configuration and operating options for the instructions 326. The memory 322 may also store any BT, WiFi, 3G, 4G, 5G, 6G, or other data that the UE 300 may send, or has received, through the communication interfaces 302. In various implementations, a system power for the UE 300 may be supplied by a power storage device, such as a battery or a transformer.
[0048] Returning to wireless radio access network (RAN) , FIG. 4 illustrates an example RAN 440 in communication with a core network 410 and wireless terminals UE1 to UE7. The RAN 440 may include one or more various types of wireless base station or WANNs 420 and 421 which may include but are not limited to gNB, eNodeB, NodeB, or other type of base stations. The RAN 440 may be backhauled to the core network 410. The WANNs 420, for example, may further include multiple separate access network nodes in the form of a Central Unit (CU) 422 and one or more Distributed Unit (DU) 424 and 426. The CU 422 is connected with DU1 424 and DU2 426 via various interfaces, for example, an F1 interface. The F1 interface, for example, may further include an F1-C interface and an F1-U interface, which may be used to carry control plane information and user plane data, respectively. In some embodiments, the CU may be a gNB Central Unit (gNB-CU) , and the DU may be a gNB Distributed Unit (gNB-DU) . While the various implementations described below are provided in the context of a 5G cellular wireless network, the underlying principles described herein are applicable to other types of radio access networks including but not limited to other current or future generations of cellular network such as 4G LTE and 6G network, as well as Wi-Fi, Bluetooth, ZigBee, and WiMax networks.
[0049] The UEs may be connected to the network via the WANNs 420 over an air interface. The UEs may be served by at least one cell. Each cell is associated with a coverage area. These cells may be alternatively referred to as serving cells. The coverage areas between cells may partially overlap. Each UE may be actively communicating with at least one cell while may be potentially connected or connectable to more than one cell. In the example of FIG. 1, UE1, UE2, and UE3 may be served by cell1 430 of the DU1, whereas UE4 and UE5 may be served by cell2 432 of the DU1, and UE6 and UE7 may be served by cell3 434 associated with DU2. In some implementations, a UE may be served simultaneously by two or more cells. Each of the UE may be mobile and the signal strength and quality from the various cells at the UE may depend on the UE location and mobility.
[0050] In some example implementations, the cells shown in FIG. 4 may be alternatively referred to as serving cells. The serving cells may be grouped into serving cell groups (CGs) . A serving cell group may be either a Master CG (MCG) or Secondary CG (SCG) . Within each type of cell groups, there may be one primary cell and one or more secondary cells. A primary cell in a MSG, for example, may be referred to as a PCell, whereas a primary cell in a SCG may be referred to as PScell. Secondary cells in either an MCG or an SCG may be all referred to as SCell. The primary cells including PCell and PScell may be collectively referred to as spCell (special Cell) . All these cells may be referred to as serving cells or cells. The term “cell” and “serving cell” may be used interchangeably in a general manner unless specifically differentiated. The term “serving cell” may refer to a cell that is serving, will serve, or may serve the UE. In other words, a “serving cell” may not be currently serving the UE. While the various embodiment described below may at times be referred to one of the types of serving cells above, the underlying principles apply to all types of serving cells in both types of serving cell groups.
[0051] FIG. 5 further illustrates a simplified view of the various network layers involved in transmitting user-plane PDUs from a transmitting device 502 to a receiving device 504 in the example wireless access network. FIG. 5 is not intended to be inclusive of all essential device components or network layers for handling the transmission of the PDUs. FIG. 5 illustrates that the data packaged by upper network layers 520 at the transmitting device 502 may be transmitted to corresponding upper layer 530 (such as radio resource control or RRC layer) at the receiving device 304 via Packet Data Convergence Protocol layer (PDCP layer, not shown in FIG. 5) and radio link control (RLC) layer 522 and of the transmitting device, the physical (PHY) layers of the transmitting and receiving devices and the radio interface, as shown as 506, and the media access control (MAC) layer 534 and RLC layer 532 of the receiving device. Various network entities in each of these layers may be configured to handle the transmission and retransmission of the PDUs.
[0052] In FIG. 5, the upper layers 520 may be referred as layer-3 or L3, whereas the intermediate layers such as the RLC layer and / or the MAC layer and / or the PDCP layer (not shown in FIG. 5) may be collectively referred to as layer-2, or L2, and the term layer-1 is used to refer to layers such as the physical layer and the radio interface-associated layers. In some instances, the term “low layer” may be used to refer to a collection of L1 and L2, whereas the term “high layer” may be used to refer to layer-3. In some situations, the term “lower layer” may be used to refer to a layer among L1, L2, and L3 that are lower than a current reference layer. Control signaling may be initiated and triggered at each of L1 through L3 and within the various network layers therein. These signaling messages may be encapsulated and cascaded into lower layer packages and transmitted via allocated control or data over-the-air radio resources and interfaces. The term “layer” generally includes various corresponding entities thereof. For example, a MAC layer encompasses corresponding MAC entities that may be created. The layer-1, for example, encompasses PHY entities. The layer-2, for another example encompasses MAC layers / entities, RLC layers / entities, service data adaptation protocol (SDAP) layers and / or PDCP layers / entities.
[0053] The present disclosure describes various embodiment for L1 measurement reporting in a mobile communication system, which may be implemented, partly or totally, by a core network, one or more network base station, and / or one or more user equipment described above. The various embodiments in the present disclosure may enable efficient wireless transmission in the telecommunication system, which may increase the resource utilization efficiency and / or boost wireless communication performance.
[0054] In some implementations, for an event-based L1 measurement reporting, a network may configure the L1 measurement configuration to a UE, and the L1 measurement configuration includes reference signal (RS) resources (e.g. synchronization signal block (SSB) or channel state information reference signal (CSI-RS) ) and associated L1 reporting configuration. In the reporting configuration, the network may indicate the report type, including periodical reporting, a-periodical reporting, semi-persistent reporting or event-based reporting.
[0055] In some implementations, for event-based reporting, the network may further indicate the event type (e.g. LTM2, LTM3, LTM4, LTM5, LTM6, etc) and corresponding event related parameters (e.g. threshold, TimeToTrigger, etc) .
[0056] In some implementations, after receiving the L1 measurement configuration, the UE starts to performs L1 measurements according to the measurement configuration, and perform event evaluation based on the L1 measurement results.
[0057] In some implementations, for event evaluation, typically, the event may be defined with “entering condition” and “leaving condition” . For example, for LTM3 event, entering condition and leaving condition are defined as below: Inequality LTM3-1 (Entering condition) Mn + Obn -Hys > Ms + Obs + Off; and / or Inequality LTM3-2 (Leaving condition) Mn + Obn + Hys < Ms +Obs + Off, wherein Mn is the beam measurement quantity of the LTM candidate cell (or target cell or neighbour cell) and Ms is the beam measurement quantity of the serving cell.
[0058] In some implementations, when entering condition is fulfilled for TimeToTrigger duration, the UE may trigger L1 measurement reporting, similarly, once target beam already fulfills entering condition and measurement report is sent to the network, later on, when leaving condition is fulfilled for TimeToTrigger duration, the UE may trigger L1 measurement reporting if ReportOnLeave is configured.
[0059] In some implementations, for event-based L1 measurement reporting, the UE needs to evaluate whether specific event is fulfilled in order to trigger the measurement report (MR) .
[0060] In some implementations, multiple events may be supported. For example, LTM-2 event means that the beam quality of serving cell is worse than a threshold; LTM-3 means that the beam quality of neighbour cell is offset better than the beam quality of beam in serving cell, LTM-4 means that the beam quality of neighbour cell is better than a threshold, and / or LTM-5 means that the beam quality of neighbour cell is better than a threshold and the beam quality of beam in serving cell is worse than another threshold.
[0061] In some implementations, regarding the content of MR, at least beam indicator (or beam index) and beam level measurement results (e.g. L1 reference signal received power (L1-RSRP) , L1 reference signal received quality (L1-RSRQ) , L1 signal to interference and noise ratio (L1-SINR) ) may be reported. Since the MR is sent via MAC CE, in order to get the valuable information from the UE and to ensure the size of the MR, the network may configure a maximum number of beams that can be reported in one MR. If the configured maximum number is larger than the number of beams that fulfilled the event, the UE can also include the beam (s) and corresponding beam results that haven’ t met the event threshold, and whether the non-satisfied beams can be reported or not is configurable.
[0062] In some implementations, to reduce the message size of L1 measurement report MAC CE, RSRP differential values (i.e., an offset value relative to a reference value, rather than an actual or absolute value) may be reported, which means that in L1 measurement report MAC CE, one beam (e.g. with highest RSRP value) is reported with absolute RSRP value, which serves as a reference value, and other beams are reported with offset values to the first reported beam.
[0063] In various embodiments in the present disclosure, a “target cell” may refer to a primary cell (PCell) (or a primary secondary cell (PSCell) ) of a configured candidate configuration; or, a “target cell” may refer to a secondary cell (Scell) of a configured candidate configuration; or, a “target cell” may refer to a configured neighbor cell or detected neighbour cell.
[0064] In various embodiments in the present disclosure, a “target beam” may refer to a beam of a target cell.
[0065] In various embodiments in the present disclosure, a “serving cell” may refer to a serving PCell or PSCell; or, a “serving cell” may refer to a serving SCell.
[0066] In various embodiments in the present disclosure, a “serving beam” may refer to a best beam of a serving cell; or a “serving beam” may refer to a beam indicated by an activated transmission configuration indicator (TCI) -state; or, a “serving beam” may refer to a beam that quasi co-located (QCLed) with a beam indicated by an activated TCI-state.
[0067] In various embodiments in the present disclosure, a UE may be a standalone UE in 5G, 6G, or other wireless telecommunication standard. The UE may be configured with carrier aggregation (CA) and / or dual connectivity (DC) . In some implementations, when the UE is configured with DC, the term “network” may refer to a master network (MN) node or a secondary network (SN) node. In some implementation with central unit-distributed unit (CU-DU) split scenario, the term “network” may refer to a CU or a DU.
[0068] Various embodiments in the present disclosure may be applicable to (but not limit to) L1 event-based measurement reporting and / or L1 event-based periodical measurement reporting.
[0069] In some implementations, “entering condition is fulfilled” may mean that both the corresponding threshold and TimeToTrigger are fulfilled; and / or similarly, “leaving condition is fulfilled” may mean that both the corresponding threshold and TimeToTrigger are fulfilled.
[0070] Various embodiments in the present disclosure are applicable to (but not limit to) L1 measurements reporting, and are also applicable to L3 based measurements reporting. In addition, various embodiments in the present disclosure are applicable to (but not limit to) MAC CE based measurement reporting, and are also applicable to signaling radio bearer (SRB) based measurement reporting, wherein the SRB may be SRB1 / 2 / 3 / 4 or a new type of SRB. In some implementations, the SRB may be terminated at CU or DU; and / or which SRB is used to transmit the measurement report may be pre-defined, or may be configured by the network.
[0071] Referring to FIG. 6A, the present disclosure describes various embodiments of a method 600 in wireless communication. The method may be performed by a wireless communication device (e.g., a user equipment (UE) ) communicating with a base station. The method may include a portion or all of the following: step 610, receiving, by a user equipment (UE) from a base station, a first message comprising a L1 measurement reporting configuration; and / or step 620, sending, by the UE based on the L1 measurement reporting configuration, a second message comprising a L1 measurement report medium access control (MAC) control element (CE) to the base station. In some implementations, the L1 measurement report MAC CE comprises information for one or more reported beams.
[0072] Referring to FIG. 6B, the present disclosure describes various embodiments of a method 650 in wireless communication. The method may be performed by a wireless network node (e.g., a base station, or a radio access network (RAN) ) . The method may include step 660, sending, by base station to a user equipment (UE) , a first message comprising a L1 measurement reporting configuration; and / or step 670, receiving, by the base station from the UE based on the L1 measurement reporting configuration, a second message comprising a L1 measurement report medium access control (MAC) control element (CE) . In some implementations, the L1 measurement report MAC CE comprises information for one or more reported beams.
[0073] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, the first message is a radio resource control (RRC) message.
[0074] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, the information comprises type information for the one or more beams comprising at least one of the following: a first type (Type-1) for a beam just fulfilling an entering condition and the L1 measurement report being triggered due to the beam’s fulfillment of the entering condition, a second type (Type-2) for the beam just fulfilling a leaving condition and the L1 measurement report being triggered due to the beam’s fulfillment of the leaving condition, a third type (Type-3) for the beam already fulfilling the entering condition and not fulfilling the leaving condition, and the L1 measurement report being triggered not due to the beam’s fulfillment of the entering condition, and / or a fourth type (Type-4) for the beam not fulfilling the entering condition.
[0075] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, for one or more reported beams, the L1 measurement report MAC CE comprises an information field indicating a type of each beam.
[0076] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, for each beam, the information field comprises 2 bits; a first value of the information field indicates the beam being a Type-3 beam; a second value of the information field indicates the beam being a Type-1 beam; a third value of the information field indicates the beam being a Type-2 beam; and / or a fourth value of the information field indicates the beam being a Type-4 beam.
[0077] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, the L1 measurement report MAC CE comprises at least one of the following: a first number of one or more Type-1 beams, the first number having N_1 bits, a second number of one or more Type-2 beams, the second number having N_2 bits, a third number of one or more Type-3 beams, the third number having N_3 bits, and / or a fourth number of one or more Type-4 beams, the fourth number having N_4 bits, wherein each of N_1, N_2, N_3, and N_4 is an integer from 2 to 4, inclusive.
[0078] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, for each beam type, in response to a number of beams for this beam type being non-zero, the L1 measurement report MAC CE comprises a beam having a highest measurement value among the beams with the beam’s absolute measurement value followed by other beams in the beams with differential measurement values.
[0079] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, the L1 measurement report MAC CE comprises at least one of the following: a first number of one or more Type-1 beams, the first number having N_1 bits, a second number of one or more Type-2 beams, the second number having N_2 bits, a third number of one or more Type-3 beams, the third number having N_3 bits, and / or a fourth number of one or more Type-4 beams, the fourth number having N_4 bits, wherein each of N_1, N_2, N_3, and N_4 is an integer from 2 to 4, inclusive; and / or for each beam, the L1 measurement report MAC CE comprises an information field indicating a type of each beam in the one or more reported beams.
[0080] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, for each beam, the information field comprises 2 bits; a first value of the information field indicates the beam being a Type-3 beam; a second value of the information field indicates the beam being a Type-1 beam; a third value of the information field indicates the beam being a Type-2 beam; and / or a fourth value of the information field indicates the beam being a Type-4 beam.
[0081] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, for all reported beams, the L1 measurement report MAC CE comprises a beam having a highest measurement value among all reported beams with the beam’s absolute measurement value followed by other beams in all reported beams with differential measurement values.
[0082] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, the UE receives an MAC CE from the base station, the MAC CE for dynamically changing a maximum number of the reported beams for the L1 measurement reporting configuration.
[0083] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to the maximum number of the reported beams being smaller than a total number of Type-1 beams, Type-2 beams, and Type-3 beams, the UE determines that the L1 measurement report MAC CE comprises the one or more beams based on a pre-defined priority.
[0084] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, the pre-defined priority comprises: the Type-1 has higher priority than the Type-2, the Type-2 has higher priority than the Type-3, and / or the Type-3 has higher priority than the Type-4.
[0085] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to the maximum number of the reported beams being smaller than a total number of Type-1 beams, Type-2 beams, and Type-3 beams: the UE determines that the L1 measurement report MAC CE comprises the one or more Type-1 beams; and / or the UE sends a second L1 measurement report MAC CE to the base station, the second L1 measurement report MAC CE comprises the one or more Type-2 beams.
[0086] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to the one or more beams of any beam type not fully being comprised in the L1 measurement report MAC CE, the UE determines that the L1 measurement report MAC CE comprises a subset of the one or more beams of this beam type according to one of the following: an order of a beam of this beam type in a triggered beam list, an order of the beam of this beam type in a leaving beam list, a measurement value of the beam of this beam type, and / or a configuration of the UE.
[0087] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to the maximum number of the reported beams being smaller than a total number of Type-1 beams, Type-2 beams, and Type-3 beams: the UE determines whether the L1 measurement report MAC CE comprises a serving cell beam and a measurement result of the serving cell beam according to a pre-configured configuration.
[0088] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, the L1 measurement report MAC CE and the second L1 measurement report MAC CE have different MAC CE formats according to one of the following: different information of the first N octets, different logical channel identifiers (LCIDs) , and / or different extended logical channel identifiers (eLCIDs) .
[0089] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, the L1 measurement report MAC CE and the second L1 measurement report MAC CE have a same MAC CE format with comprising information of the first N octets, according to one of the following: different field values of the first N octets, and / or same field values of the first N octets.
[0090] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, the second L1 measurement report MAC CE comprises all beams with differential measurement values; and / or the second L1 measurement report MAC CE comprises one beam with a highest measurement value and other beams with differential measurement values.
[0091] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, the UE determines that a last L1 measurement report MAC CE comprises a field indicating the last L1 measurement report MAC CE.
[0092] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, the UE determines the L1 measurement report MAC CE is truncated according to at least one of the following: excluding measurement result information for each type of the beams; comprising a portion of following beam types: Type-1, Type-2, Type-3, or Type-4; and / or comprising N beams with highest measurement values for each beam type, wherein N is a pre-defined integer.
[0093] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to more than one L1 measurement reporting procedures overlapping in one reporting occasion, the UE combines the more than one L1 measurement reporting procedures and sends the combined L1 measurement reporting, which applies to at least one of the following: all beams that are associated with one L1 measurement reporting configuration, all beams that are associated with one neighbor cell, all beams that are associated with one candidate identifier (ID) , and / or all beams that are associated with different reporting configurations.
[0094] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, in response to more than one L1 measurement reporting procedures overlapping in one reporting occasion, the UE only sends the L1 measurement report that is triggered by fulfillment of the entering condition.
[0095] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, for each follow-up periodical reporting, the UE only sends the L1 measurement report when at least one of following conditions is satisfied: for the same L1 measurement reporting configuration, the triggered beam list or the reported beam list becomes different compared with last reported L1 measurement report, for the same L1 measurement reporting configuration, the triggered beam list or the reported beam list is the same as last reported L1 measurement report, but the best beam or best N beams becomes different compared with the last reported L1 measurement report, wherein N is a pre-configured or pre-defined integer.
[0096] In some implementations, optionally or additionally to any one or any combinations of one or more implementations or embodiments in the present disclosure, the triggered beam list or the reported beam list corresponds to the target beams only.
[0097] The present disclosure describes various exemplary embodiments for L1 measurement reporting in a mobile communication system, and the exemplary embodiments merely serve as examples and do not pose limitations. Any steps and / or operations in one same embodiment / implementation or more than one different embodiments / implementation in the present disclosure may be combined or arranged in any amount or order, as desired. Two or more of the steps and / or operations may be performed in parallel. Embodiments and implementations in the disclosure may be used separately or combined in any order. Further, each of the methods (or embodiments) may be implemented by processing circuitry (e.g., one or more processors or one or more integrated circuits) .
[0098] Embodiment Set I
[0099] The present disclosure describes various embodiments for L1 measurement report MAC CE in a mobile communication system.
[0100] In some implementations, for an event-based L1 measurement reporting, a UE performs measurements and does measurement event evaluation according to the event configuration. If a neighbour beam fulfills the event condition (e.g. entering condition) , the beam will be stored in L1 triggered beam list in UE’s variety, and the UE initiates L1 measurement reporting procedure. If more than one neighbour beams have fulfilled the event condition, then the L1 triggered beam list can store all those beams until the beam fulfills leaving condition. Once a beam in L1 triggered beam list has fulfilled the leaving condition, the beam will be removed from the L1 triggered beam list that stored by the UE.
[0101] In some implementations, in addition, when a neighbour beam fulfills the leaving condition, the beam will be stored in L1 leaving beam list in UE’s variety, and the UE initiates L1 measurement reporting procedure if “reportOnLeave” is configured. For each beam that fulfills the leaving condition, it will only be reported once. If a beam that fulfilled leaving condition is successfully reported to the network, the beam will be removed from the L1 leaving beam list that stored by the UE.
[0102] In some implementations, from a UE’s perspective, there may be a portion or all of the following 4 types of beams. Type 1 beams: Beams that just fulfill the entering condition (e.g. to be added to triggered beam list) , and initiates L1 measurement reporting. Type 2 beams: Beams that just fulfills the leaving condition (e.g., to be added to the leaving beam list) , and initiates L1 measurement reporting if reportOnLeave is configured. Type 3 beams: Beams that already fulfilled the entering condition (already reported) and haven’t met the leaving condition, e.g., beams already exist in the triggered beam list, wherein these beams will be reported in the same measurement report (MR) when the L1 measurement reporting procedure is initiated due to Type 1 or Type 2 beams. Type 4 beams: Beams that haven’t fulfilled the entering condition.
[0103] Embodiment Set II
[0104] The present disclosure describes various embodiments for entering and leaving indications in the L1 measurement report MAC CE in a mobile communication system.
[0105] In some implementations, in a L1 measurement report MAC CE, a UE reports at least one or more of the following information.
[0106] One or more candidate IDs indicate the index of configured candidate configuration.
[0107] One or more cell IDs (or physical cell IDs (PCIs) or NR cell global IDs (NCGIs) ) indicate the cell for which beam results are reported.
[0108] One or more reporting configuration IDs.
[0109] One or more RS resource configuration IDs.
[0110] A list of beam information (e.g. SS / PBCH Block Resource indicator (SSBRI) , CSI-RS resource indicator (CRI) ) and corresponding beam-level measurement results (e.g. Reference Signal Receive Power (RSRP) , Reference Signal Receive Quality (RSRQ) , Signal to Interference and Noise Ratio (SINR) ) .
[0111] For each reported beam, the UE can indicate whether the beam fulfills the entering condition or leaving condition. In some implementations, such information may be indicated by one of the following methods.
[0112] Method 1: For each reported beam (other than serving beam) , the MAC CE includes N (e.g., 2) bits. The value of the two bits indicates the entering / leaving status of the beam. For a non-limiting example, a value 00 means the beam has already fulfilled the entering condition and hasn’ t met the leaving condition, but this measurement report (MR) is not sent due to the fulfillment of entering condition for this beam (this beam already triggered an L1 MR report before) (e.g. Type 3 beam) . A value 01 means the beam just fulfilled the entering condition and the MR is triggered due to the fulfillment of entering condition for this beam (e.g. Type 1 beam) . A value 10 means the beam just fulfilled the leaving condition and MR is triggered due to the fulfillment of leaving condition for this beam (e.g. Type 2 beam) . A value 11 means the beam hasn’ t fulfilled entering condition (e.g. Type 4 beam) .
[0113] In some implementations, a mapping relationship between the value of 2 bits and its meaning may be different from above example (e.g., a value 00 representing Type 1 beam, a value 01 representing Type 2 beam, a value 10 representing Type 3 beam, and a value 11 representing Type 4 beam) . It is also possible not all 4 values (00 / 01 / 10 / 11) are defined (e.g., only three or two of the 4 values are defined) .
[0114] In some implementations, FIG. 7A shows an example of the 2 bits entering / leaving information ( “Entering / leaving ind” ) , wherein RSRI is a reference signaling resource index; RSRP is an actual (or “absolute” ) value of the measured reference signal receive power for the corresponding RSRI; DIFF RSRP is a differential value (or “offset value” ) between the corresponding RSRI’s measured RSRP value and the absolute RSRP value as comprised in the MAC CE; and / or RSRP_serving is an actual (or “absolute” ) value of the measured RSRP of the serving cell. For example, DIFF RSRP_2 is (RSRP_1 –RSRP_2) ; and DIFF RSRP_M is (RSRP_1 –RSRP_M) .
[0115] In the present disclosure, RSRP may be used as an example, for example RSRP being used as example in FIG. 7A and many other figures, RSRP may be replaced by RSRQ, SINR, or other measurement value.
[0116] Method 2: In L1 measurement report MAC CE, the UE includes one or more the following numbers:
[0117] Case 1: a number of beams that just fulfill the entering condition, occupies 2 or 3 or 4 bits;
[0118] Case 2: a number of beams that just fulfill the leaving condition, occupies 2 or 3 or 4 bits;
[0119] Case 3: a number of beams that already fulfilled the entering condition (already reported) and haven’ t met the leaving condition, occupies 2 or 3 or 4 bits;
[0120] Case 4: a number of beams that haven’ t fulfilled the entering condition, occupies 2 or 3 or 4 bits.
[0121] In some implementations, the length (i.e., number of bits) of Case 1, Case 2, Case 3 and Case 4 fields may be different.
[0122] In some implementations, for method 2, in the MAC CE, if more than one of above numbers are included (e.g. not to set to 0) , the corresponding beam information and beam result may be reported following a pre-defined order. For example, the case 1 beams and corresponding beam results are included first, then the case 2 beams and corresponding beam results are included next, then the case 3 beams and corresponding beam results are included. For each type (case 1 / 2 / 3) , if there are more than one beams within such type, the beam with highest measurement result is listed first (with absolute RSRP / RSRQ / SINR value) , then other beams within such type are listed with RSRP / RSRQ / SINR differential values.
[0123] In some implementations, FIG. 7B shows an example of Method 2 MAC CE, wherein N1 field indicates the number of Case 1 beams, N2 indicates the number of Case 2 beams, and N3 indicates the number of Case 3 beams. In some implementations, the order of Case 1 / 2 / 3 may be other order than the order in FIG. 7B, for example, Case 2 first, the followed by Case 1 and Case 3.
[0124] Method 3: a combination of Method 1 and Method 2. In L1 measurement report MAC CE, for each reported beam (other than serving beam) , the MAC CE includes 2 bits. The value of the two bits indicates the entering / leaving status of the beam. Meanwhile, the MAC CE also includes one or more the following numbers:
[0125] Case 1: Number of beams that just fulfill the entering condition, occupies 2 or 3 or 4 bits;
[0126] Case 2: Number of beams that just fulfill the leaving condition, occupies 2 or 3 or 4 bits;
[0127] Case 3: Number of beams that already fulfilled the entering condition (already reported) and haven’t met the leaving condition, occupies 2 or 3 or 4 bits;
[0128] Case 4: Number of beams that haven’ t fulfilled the entering condition, occupies 2 or 3 or 4 bits.
[0129] In some implementations, different from Method 2, for all the reported beams (other than serving beam) , the beam with highest measurement result is listed first (with absolute RSRP / RSRQ / SINR value) , then other beams are listed with RSRP / RSRQ / SINR differential values. And for each reported target beam, the UE includes N bits (e.g, N=2) entering / leaving indication.
[0130] In some implementations, FIG. 7C shows an example of Method 3 MAC CE. In some implementations, the order of N1 / N2 / N3 may be changed (i.e., not the same as the order in FIG. 7C) .
[0131] Embodiment Set III
[0132] The present disclosure describes various embodiments for determining reported beams when a maximum reported beam number configured by a network is too small in the L1 measurement report MAC CE in a mobile communication system.
[0133] In some implementations, for L1 measurement reporting, a network can configure a maximum number of reported beams to a UE, to indicate how many beams other than serving beam can be reported in a L1 measurement report MAC CE. This maximum number of reported beams can be configured in L1 measurement reporting configuration, and transmitted from the network to the UE via a RRC message.
[0134] In some implementations, the network can also send a MAC CE to the UE, to dynamically change the maximum number of reported beams for an L1 reporting configuration.
[0135] In some implementations, for a L1 reporting configuration, it is possible the total number of Type 1, Type2 and Type 3 beams are larger than the maximum number of reported beams that configured by the network. In this case, the UE needs to decide which beam (s) to be selected to be reported in L1 measurement report MAC CE.
[0136] In some implementations, the UE selects the reported beam (s) according to one of the following methods.
[0137] Method 1: The Type 1, Type2 and Type 3 beams can be reported in one L1 measurement report MAC CE. The UE decides the reported beams based on a pre-defined rule or a pre-defined priority.
[0138] For a non-limiting example, the reporting priority may be defined as “Type 1 beams >Type2 beams > Type 3 beams > Type 4 beams” , which means the UE firstly selects / includes Type 1 beams, if a number of the selected Type 1 beams does not reach the maximum number of reported beams, the UE then selects / includes Type 2 beams, and after that, if a number of the selected Type 1 and selected Type 2 beams does not reach the maximum number of reported beams, the UE includes Type 3 beams in the L1 measurement reporting MAC CE.
[0139] Method 2: The UE may always report some certain types (e.g., Type 1 beams and Type 2 beams) via two or more separate L1 measurement report MAC CEs. For example, for a reporting configuration, a neighbour beam-1 fulfills the entering condition and at the same time a neighbour beam-2 fulfills the leaving condition. In this case, the UE must initiate two separate L1 measurement reporting procedures, and send two separate L1 measurement report MAC CEs. One MAC CE is for entering condition, in this MAC CE, the UE reports beam-1 and other Type 3 beams. The other MAC CE is for leaving condition, in this MAC CE, the UE either reports only beam-2, or the UE reports both beam-2 and other Type 3 beams.
[0140] In some implementations, in method 2, for MR triggered by entering condition, the reporting priority for Type 1 beam is higher than Type 3 beams. And for MR triggered by leaving condition, the reporting priority for Type 2 beam is higher than Type 3 beams.
[0141] In some implementations, in both Method 1 and Method 2, for a given beam type (1 / 2 / 3 / 4) , if the UE cannot report all of the beams, the UE selects the reported beams by one of the below options. For one option, the UE follows the order of triggered beam list (or leaving beam list) . For one example, the beam listed first has higher priority; or for another example, the beam listed first has the lowest priority. For another option, the selecting is based on the measurement results of beams, e.g. the beam with higher measurement results (e.g., RSRP value) has higher priority. For another option, the selecting is up to UE’s implementation;
[0142] In some implementations, in both Method 1 and Method 2, Type 4 beams may have the lowest priority, and the Type 4 beams may only be reported if the configured maximum reported beam number is larger than the total number of Type 1, Type 2 and Type 3 beams.
[0143] In some implementations, if the configured maximum reported beam number is smaller, the UE is allowed to send the L1 measurement report MAC CE without including serving cell beam and serving cell beam results. And whether serving cell beam and beam results can be skipped can be configured by the network.
[0144] Embodiment Set IV
[0145] The present disclosure describes various embodiments for truncating L1 measurement report MAC CE in a mobile communication system.
[0146] In some implementations, for L1 measurement reporting, a truncated MAC CE may be used when a UL grant cannot fit the size of the generated L1 measurement report MAC CE.
[0147] In some implementations, a UE may follow at least one of the following methods to truncate a MAC CE.
[0148] Method 1: The first sent MAC CE and follow-up MAC CE (s) have different MAC CE formats. For example, only the first sent MAC CE includes the complete information of the first N octets (e.g. information other than reported beam and beam results) , and / or the first sent MAC CE does not include the serving beam and serving beam results. Optionally, the first sent MAC CE and follow-up MAC CE can have different LCID or eLCID;
[0149] In some implementations, FIG. 8A shows an example of Method 1. In some implementations, the detailed fields of the first N octet may be different from the example in FIG. 8A.
[0150] Method 2: The first sent MAC CE and follow-up MAC CE (s) have the same MAC CE format, which means the MAC CE (s) all include the first N octets (information other than reported beam and beam results) . Method 2 may include one or more of the following options. Option 1: The value of the fields in first N octets can be different; In this option, the parameters of the first N octet are only applicable to the beams reported in this MAC CE. Option 2: The value of the fields in first N octets must be the same. In this option, the parameters of the first N octet are applicable to all the beams reported in first set MAC CE and follow-up MAC CEs.
[0151] In some implementations, FIG. 8B shows an example of Method 2 MAC CEs. In some implementations, the detailed fields of the first N octet can be different from the example in FIG. 8B.
[0152] In some implementations, in both Method 1 and Method 2, except the first sent MAC CE, for other MAC CEs, the beams may be indicated according to one or more of the following options. Option 1: All the beams are included with differential values of the measurement results, e.g. offset to the measurement result of the best beam that reported in the first sent MAC CE. Option 2: Among the beams that included in this MAC CE, the best beam with highest measurement result is listed first (with absolute RSRP / RSRQ / SINR value) , then, other beams are listed with differential values.
[0153] In some implementations, in both Method 1 and Method 2, for the last sent truncated MAC CE, the UE can include a field to indicate it is the last truncated MAC CE. FIG. 8C shows an example of the last truncated MAC CE indication ( “Last Ind” ) .
[0154] Method 3: The truncated L1 measurement report MAC CE can be a simplified version of the non-truncated L1 measurement report MAC CE. In this method, the truncated L1 measurement report MAC CE is to transfer the most important information to the NW if there is no enough TB size is provided via UL-SCH.
[0155] In some implementations, the truncated MAC CE may not include the measurement result information (e.g. RSRP / RSRQ / SINR) for each type of beam.
[0156] In some implementations, the truncated MAC CE may provide the beam information (e.g. SSBRI, CSIRI) for Type 1 beams, Type 2 beams, Type 3 beams or Type 4 beams only, or any two of them, or any three of them. The detailed rule of which kind of beams that only beam information are reported in truncated MAC CE can be pre-defined in the specification or configured by the network via RRC message, or dynamically indicated by the network via MAC CE.
[0157] In some implementations, the truncated MAC CE may only provide N best beams information for each beam type (Type 1 beam, Type 2 beam, Type 3 beam, Type 4 beam) , the number N can be pre-defined in the specification, or configured by the network via RRC message, or dynamically indicated by the network via MAC CE; Optionally, the N can be different for different beam types.
[0158] In some implementations, the truncated MAC CE may provide the beam information in a combination of above implementations, for example, the truncated MAC CE only provides the N best beam with or without the corresponding RSRP values for Type 1 beams, Type 2 beams, Type 3 beams, or Type 4 beams.
[0159] Embodiment Set V
[0160] The present disclosure describes various embodiments for L1 measurement reporting mechanism being L1 event triggered periodical reporting in a mobile communication system.
[0161] In some implementations, for event-based L1 measurement reporting, a network may configure non-zero interval of reporting (ReportInterval) and non-zero times of reporting (ReportAmount) to a UE. Once these are configured, and a L1 measurement reporting procedure is triggered, the UE will periodically send the report according to the configured report interval and amount. In each MR, the UE reports the beams that still fulfilled the entering condition (e.g. have not met leaving condition) .
[0162] In some implementations, because L1 measurement can be evaluated per-beam, when two (or more) neighbour beams fulfill the entering condition at different time occasions, two (or more) individual L1 measurement reporting procedures may be initiated. If ReportInterval and ReportAmount are set to be non-zero values, the two (or more) parallel periodical reporting may occur, which increases the signalling overhead. To address the issue, the UE can combine the reporting procedures, which means when periodical reporting is configured, there is only one periodical reporting processing, so as to avoid duplicate reporting.
[0163] In some implementations, such combination applies to all the beams that associated with one reporting configuration; or applies to all the beams that associated with one neighbor cell or candidate ID; or applies to beams that associated with different reporting configuration (as long as the reporting occasions are the same) .
[0164] In some implementations, FIG. 9A and 9B shows an example of combining two reporting procedures to avoid duplicate reporting, wherein two MRs may occur at several time points (T3, T4, and T5) , and the two MRs are combined and only one MR is transmitted at time points (T3, T4, and T5) .
[0165] Referring to FIG. 9A, without the enhancement, when beam 1 and beam 2 fulfills entering condition at different time, then two separate measurement reporting procedures are initiated, then for periodical reporting, at T3, T4 and T5, two separate MRs may be sent, and the two MRs may have the same content.
[0166] Referring to FIG. 9B, with new reporting method, at T3, T4 and T5, the UE only needs to send one MR, so the total number of MRs can be reduced.
[0167] In some implementations, L1 event-periodical reporting may only be applicable to the event that triggered by the fulfillment of entering condition, it does not applicable to the event that triggered due to fulfillment of leaving condition.
[0168] Embodiment Set VI
[0169] The present disclosure describes various embodiments for L1 measurement reporting mechanism being best beam change reporting in a mobile communication system.
[0170] In some implementations, L1 measurement report may be used to update LTM candidate cell, or to update the activated TCI-state of candidate cell, or to trigger early TA acquisition for candidate cell. So, a network needs to know the latest beam results of candidate cells, especially whether the best beam of neighbour cell changes or not. To achieve this and to minimize the signalling overhead, the following method may be applied.
[0171] In some implementations, the network configures the event-based periodical L1 measurement reporting (e.g. reportInterval and reportAmount are configured for the event) , when one or more beams fulfills the event and triggers measurement reporting, the UE starts periodical reporting for the MR. For each follow-up periodical reporting, the UE only sends MR if at least one of following condition is satisfied. The UE skips the MR transmission if both of conditions are not satisfied. Condition 1: For the same reporting configuration, the triggered beam list or the reported beam list becomes different compared with last reported MR. Condition 2: For the same reporting configuration, the triggered beam list or the reported beam list is the same as last sent MR, but the best beam or best N beams of the reported beams becomes different compared with the last reported MR; The number N can be configured by the network or pre-defined.
[0172] In some implementations, the triggered beam list or reported beam list described above only refers to the target beams (e.g. beams other than serving beams) . Serving beam change does not impact the periodical reporting skipping mechanism.
[0173] Embodiment Set VII
[0174] The present disclosure describes various embodiments for sub-band full duplex (SBFD) random access channel (RACH) occasion (RO) selection and set selection in a mobile communication system.
[0175] In some implementations, a network node (e.g., gNB) may configure RACH resource and SBFD RACH resource to a UE. The SBFD RACH resource can be configured by reusing same RACH resource parameters as RACH resource configuration, or can be configured by introducing a new parameter including SBFD RACH dedicated parameters. The SBFD RACH resource configuration configures SBFD ROs. The RACH resource configuration configures non-SBFD ROs.
[0176] In some implementations, in RACH resource configuration and / or SBFD RACH resource configuration, the gNB can configure different RACH partition parameters, that is to say, gNB can configure different RACH resources to be associated with different feature or feature combinations (FC) in RACH resource configuration and / or SBFD RACH resource configuration. The different RACH resources to be associated with different feature or FCs are different RACH resource sets. The different preambles to be associated with different feature or feature combinations (FC) in RACH resource configuration and / or SBFD RACH resource configuration can be configured same or different. That is to say, the gNB can configure a set pool for RACH resource configuration, and a set pool for SBFD RACH resource configuration. Each set pool contains one or more sets.
[0177] In some implementations, the UE can determine whether to prioritize using SBFD RO (RACH occasion) or non-SBFD RO by a NW indication or by a RSRP threshold.
[0178] In some implementations, the UE can be configured by gNB with RSRP thresholds for downlink pathloss reference for determine Msg1 repetition availability and Msg1 repetition number. The RSRP thresholds for downlink pathloss reference can be configured differently or independently for RACH resource configuration and for SBFD RACH resource configuration.
[0179] In some implementations, one issue is, when selecting set, whether the UE should only select set within set pool for RACH resource configuration, or only select set within set pool for SBFD RACH resource configuration, or within both sets pools, and / or how the UE balances the importance of selecting set and selecting RO type. The present disclosure includes various embodiment with one or more of the following solutions to address at least one of the above issues.
[0180] For one solution (solution 1) , based on above, when initiating random access (RA) procedure, if UE verifies the feature of Msg1 repetition is available, UE should select the set corresponding to Msg1 repetition and / or other features. For example, if UE determines the Msg1 repetition is available for current RA, UE should only select the set within the set pool configured for SBFD RACH resource configuration, or UE should only select the set within the set pool configured for RACH resource configuration, or UE can select the set within both set pools configured for SBFD RACH resource configuration and for RACH resource configuration.
[0181] For one example (Example 1) , if there is at least one of the set that satisfies all the UE’s wanted features including Msg1 repetition in the set pool of SBFD RACH resource configuration, the UE should only select this set associating with all features within the set pool of SBFD RACH resource configuration; or, if there is at least one of the set that satisfies all the UE’s wanted features including Msg1 repetition in the set pool of RACH resource configuration, the UE should only select this set associating with all features within the set pool of RACH resource configuration.
[0182] For another example (Example 2) , if the UE find there is no set that satisfies all the UE’s wanted features including Msg1 repetition but there are several sets corresponding to a subset of all features, the UE should select the set corresponding to the subset of all features according to indicated priority of features. If the wanted subset of features contains the feature of Msg1 repetition because of configured priority, UE should select or reselect the set corresponding to the subset of features among SBFD RACH resource configuration or among RACH resource configuration, depending which RO type the UE selects; If the wanted subset of features does not contain the feature of Msg1 repetition because of configured priority, UE should select or reselect the set corresponding to the subset of features among all the UE’s configured set pool (s) , e.g., among the set pool for RACH resource configuration and the set pool for SBFD RACH resource configuration. This is to extend the set selection scope and ensure that UE can satisfy the wanted feature / set as much as possible.
[0183] For another example (Example 3) , if the UE determines the Msg1 repetition is unavailable, the UE should select the set according to other features other than Msg1 repetition among all the UE’s configured set pool (s) , e.g., among the set pool for RACH resource configuration and the set pool for SBFD RACH resource configuration. This is to extend the set selection scope and ensure that UE can satisfy the wanted feature / set as much as possible. Further, the set that UE finally selects can contain SBFD RO, legacy RO or both type of ROs.
[0184] For another example (Example 4) , even if the UE selects SBFD ROs first, if the UE finds there is no set in the set pool of SBFD RACH resource configuration that satisfies all the FC or subset of FC, but UE finds there is set in the set pool of RACH resource configuration that satisfies all the FC or subset of FC, the UE prioritize to set the set in the set pool of RACH resource configuration that satisfies all the FC or subset of FC.
[0185] In some implementations, the set selection in the above examples can happen after UE selects / determines RO type (e.g., SBFD RO or non-SBFD RO) , or before the UE selects / determines RO type.
[0186] In some implementations, the UE does not find or select any set with features means the UE should select a set that does not associated with any feature.
[0187] For another solution (Solution 2) , when initiating random access (RA) procedure, the UE should firstly determine feature / FC availability, and then select a first set according to a first FC within the set pool configuration for SBFD RACH resource configuration, and in parallel, UE should select a second set according to a second FC within the set pool configuration for RACH resource configuration. The final selected first set and second set can associate with same or different FCs, or at least one of them does not associate with any FCs. Then after set selection on different kinds of ROs, UE should determine whether to use SBFD RO for RA or use non-SBFD RO for RA and correspondingly determine whether to adopt the first set or the second set.
[0188] For one example (Example 1) , if the UE determines the first FC contains a feature of Msg1 repetition, and UE determines the second FC does not contain a feature of Msg1 repetition, in this case, UE should select the first set corresponding to the first FC within the set pool of SBFD RACH resource configuration, and UE should select the second set corresponding to the second FC within all the set pools of SBFD RACH resource configuration and legacy RACH resource configuration;
[0189] For another example (Example 2) , if the UE determines the second FC contains a feature of Msg1 repetition, and UE determines the first FC does not contain a feature of Msg1 repetition, in this case, UE should select the second set corresponding to the second FC within the set pool of SBFD RACH resource configuration, and UE should select the first set corresponding to the first FC within all the set pools of SBFD RACH resource configuration and legacy RACH resource configuration;
[0190] For another example (Example 3) , if the UE determines the first FC and second FC both contains a feature of Msg1 repetition, UE selects set within the set pools for SBFD RACH resource configuration and for RACH resource configuration separately;
[0191] For another example (Example 4) , if for one set pool for either SBFD RACH resource configuration or RACH resource configuration, there is no set within the set pool that satisfies all the UE’s wanted features including Msg1 repetition, the UE can select or reselect set corresponding to the subset of features other than Msg1 repetition among all the set pools for both SBFD RACH resource configuration and RACH resource configuration. That is to say, if the finally selected set associates with Msg1 repetition, the set should be selected from the set pool of SBFD RACH resource configuration or RACH resource configuration, and if the availability of Msg1 repetition is determined by Msg1 repetition RSRP threshold for SBFD RO / non-SBFD RO, the set pool should be that of the SBFD RACH resource configuration / RACH resource configuration;
[0192] For another example (Example 5) , when the UE selects a first set and a second set, and the two sets associates with different FCs or same FCs, If UE further determines to use SBFD RO, then UE should select the first set; if UE determines to use non-SBFD RO, then UE should select the second set.
[0193] For another example (Example 6) , when the UE selects a first set and a second set, and the two sets associates with different FCs or same FCs, if UE further determines to use SBFD RO, UE selects the set that associated with the SBFD RACH resource; if UE further determines to use non-SBFD RO, UE selects the set that associated with the RACH resource.
[0194] For another example (Example 7) , if the UE determines the Msg1 repetition is unavailable for both SBFD RO and non-SBFD ROs, UE should select the set according to other features other than Msg1 repetition among all the UE’s configured set pool (s) , e.g., among the set pool for RACH resource configuration and the set pool for SBFD RACH resource configuration. This is to extend the set selection scope and ensure that UE can satisfy the wanted feature / set as much as possible. Further, the set that UE finally selects can contain SBFD RO, legacy RO or both type of ROs. Then UE can perform further RO type selection in this selected set.
[0195] For another example (Example 8) , if the UE selects a set that is not associates with any feature, and UE selects a set that is associated with all of the features or subset of the features, UE should prioritize to select the final set as the set that is associated with all of the features or subset of the features, no matter which RO type it determines.
[0196] In some implementations, if a first set and second set are associated with same features or FCs, the first set and second set are determined as one set since the associated features / FCs are same.
[0197] For another solution (Solution 3) , there may one or more of the following rules about the fallback.
[0198] If one final selected set contains two kinds of ROs, the UE can further select RO type according to some criteria;
[0199] If one final selected set contains only one kind of RO, the UE can only use this RO type instead of further selecting RO type based on other criterias;
[0200] If the UE selects a first set corresponding to SBFD RACH resource configuration and a second set corresponding to RACH resource configuration, and UE further selects SBFD RO and using the first set of SBFD RACH resource for RA, and after failure for several times: the UE can fallback to non-SBFD RO using the set of same features in the set pool of RACH resource, if there is no any such sets, UE can fallback to use the second set corresponding to RACH resource configuration, which UE selects at the beginning of the RA. Or, the UE directly fallback to use the second set corresponding to RACH resource configuration, which UE selects at the beginning of the RA.
[0201] The present disclosure describes methods, apparatus, and computer-readable medium for L1 measurement reporting in a mobile communication system. The present disclosure addressed the issues with LTM in a wireless communication system. The methods, devices, and computer-readable medium described in the present disclosure may facilitate the performance of LTM in wireless communication, thus improving efficiency and overall performance. The methods, devices, and computer-readable medium described in the present disclosure may improves the overall efficiency of the wireless communication systems.
[0202] In some other embodiments, a computer-readable medium comprising instructions which, when executed by a computer, cause the computer to carry out the above methods. The computer-readable medium may be referred as non-transitory computer-readable media (CRM) that stores data for extended periods such as a flash drive or compact disk (CD) , or for short periods in the presence of power such as a memory device or random access memory (RAM) . In some embodiments, computer-readable instructions may be included in a software, which is embodied in one or more tangible, non-transitory, computer-readable media. Such non-transitory computer-readable media can be media associated with user-accessible mass storage as well as certain short-duration storage that are of non-transitory nature, such as internal mass storage or ROM. The software implementing various embodiments of the present disclosure can be stored in such devices and executed by a processor (or processing circuitry) . A computer-readable medium can include one or more memory devices or chips, according to particular needs. The software can cause the processor (including CPU, GPU, FPGA, and the like) to execute particular processes or particular parts of particular processes described herein, including defining data structures stored in RAM and modifying such data structures according to the processes defined by the software. In various embodiments in the present disclosure, the term “processor” may mean one processor that performs the defined functions, steps, or operations or a plurality of processors that collectively perform defined functions, steps, or operations, such that the execution of the individual defined functions may be divided amongst such plurality of processors.
[0203] Reference throughout this specification to features, advantages, or similar language does not imply that all of the features and advantages that may be realized with the present solution should be or are included in any single implementation thereof. Rather, language referring to the features and advantages is understood to mean that a specific feature, advantage, or characteristic described in connection with an embodiment is included in at least one embodiment of the present solution. Thus, discussions of the features and advantages, and similar language, throughout the specification may, but do not necessarily, refer to the same embodiment.
[0204] Furthermore, the described features, advantages and characteristics of the present solution may be combined in any suitable manner in one or more embodiments, for non-limiting examples, a portion from one or more embodiment may be combined with another portion of other embodiments. One of ordinary skill in the relevant art will recognize, in light of the description herein, that the present solution can be practiced without one or more of the specific features or advantages of a particular embodiment. In other instances, additional features and advantages may be recognized in certain embodiments that may not be present in all embodiments of the present solution.
Claims
1.A method in a wireless communication system, the method comprising:receiving, by a user equipment (UE) from a base station, a first message comprising a L1 measurement reporting configuration; andsending, by the UE based on the L1 measurement reporting configuration, a second message comprising a L1 measurement report medium access control (MAC) control element (CE) to the base station,wherein the L1 measurement report MAC CE comprises information for one or more reported beams.2.A method in a wireless communication network, the method comprising:sending, by base station to a user equipment (UE) , a first message comprising a L1 measurement reporting configuration; andreceiving, by the base station from the UE based on the L1 measurement reporting configuration, a second message comprising a L1 measurement report medium access control (MAC) control element (CE) ,wherein the L1 measurement report MAC CE comprises information for one or more reported beams.3.The method according to any of claims 1 to 2, wherein:the first message is a radio resource control (RRC) message.4.The method according to any of claims 1 to 3, wherein:the information comprises type information for the one or more beams comprising at least one of the following:a first type (Type-1) for a beam just fulfilling an entering condition and the L1 measurement report being triggered due to the beam’s fulfillment of the entering condition,a second type (Type-2) for the beam just fulfilling a leaving condition and the L1 measurement report being triggered due to the beam’s fulfillment of the leaving condition,a third type (Type-3) for the beam already fulfilling the entering condition and not fulfilling the leaving condition, and the L1 measurement report being triggered not due to the beam’s fulfillment of the entering condition, ora fourth type (Type-4) for the beam not fulfilling the entering condition.5.The method according to any of claims 1 to 4, wherein:for one or more reported beams, the L1 measurement report MAC CE comprises an information field indicating a type of each beam.6.The method according to claim 5, wherein:for each beam, the information field comprises 2 bits;a first value of the information field indicates the beam being a Type-3 beam;a second value of the information field indicates the beam being a Type-1 beam;a third value of the information field indicates the beam being a Type-2 beam; anda fourth value of the information field indicates the beam being a Type-4 beam.7.The method according to any of claims 1 to 4, wherein:the L1 measurement report MAC CE comprises at least one of the following:a first number of one or more Type-1 beams, the first number having N_1 bits,a second number of one or more Type-2 beams, the second number having N_2 bits,a third number of one or more Type-3 beams, the third number having N_3 bits, ora fourth number of one or more Type-4 beams, the fourth number having N_4 bits,wherein each of N_1, N_2, N_3, and N_4 is an integer from 2 to 4, inclusive.8.The method according to claim 7, wherein:for each beam type, in response to a number of beams for this beam type being non-zero, the L1 measurement report MAC CE comprises a beam having a highest measurement value among the beams with the beam’s absolute measurement value followed by other beams in the beams with differential measurement values.9.The method according to any of claims 1 to 4, wherein:the L1 measurement report MAC CE comprises at least one of the following:a first number of one or more Type-1 beams, the first number having N_1 bits,a second number of one or more Type-2 beams, the second number having N_2 bits,a third number of one or more Type-3 beams, the third number having N_3 bits, ora fourth number of one or more Type-4 beams, the fourth number having N_4 bits,wherein each of N_1, N_2, N_3, and N_4 is an integer from 2 to 4, inclusive; andfor each beam, the L1 measurement report MAC CE comprises an information field indicating a type of each beam in the one or more reported beams.10.The method according to claim 9, wherein:for each beam, the information field comprises 2 bits;a first value of the information field indicates the beam being a Type-3 beam;a second value of the information field indicates the beam being a Type-1 beam;a third value of the information field indicates the beam being a Type-2 beam; anda fourth value of the information field indicates the beam being a Type-4 beam.11.The method according to claim 9, wherein:for all reported beams, the L1 measurement report MAC CE comprises a beam having a highest measurement value among all reported beams with the beam’s absolute measurement value followed by other beams in all reported beams with differential measurement values.12.The method according to any of claims 1 to 11, wherein:the UE receives an MAC CE from the base station, the MAC CE for dynamically changing a maximum number of the reported beams for the L1 measurement reporting configuration.13.The method according to claim 12, wherein:in response to the maximum number of the reported beams being smaller than a total number of Type-1 beams, Type-2 beams, and Type-3 beams, the UE determines that the L1 measurement report MAC CE comprises the one or more beams based on a pre-defined priority.14.The method according to claim 13, wherein:the pre-defined priority comprises:the Type-1 has higher priority than the Type-2,the Type-2 has higher priority than the Type-3, andthe Type-3 has higher priority than the Type-4.15.The method according to claim 12, wherein:in response to the maximum number of the reported beams being smaller than a total number of Type-1 beams, Type-2 beams, and Type-3 beams:the UE determines that the L1 measurement report MAC CE comprises the one or more Type-1 beams; andthe UE sends a second L1 measurement report MAC CE to the base station, the second L1 measurement report MAC CE comprises the one or more Type-2 beams.16.The method according to any of claims 13 to 15, wherein:in response to the one or more beams of any beam type not fully being comprised in the L1 measurement report MAC CE, the UE determines that the L1 measurement report MAC CE comprises a subset of the one or more beams of this beam type according to one of the following:an order of a beam of this beam type in a triggered beam list,an order of the beam of this beam type in a leaving beam list,a measurement value of the beam of this beam type, ora configuration of the UE.17.The method according to claim 12, wherein:in response to the maximum number of the reported beams being smaller than a total number of Type-1 beams, Type-2 beams, and Type-3 beams:the UE determines whether the L1 measurement report MAC CE comprises a serving cell beam and a measurement result of the serving cell beam according to a pre-configured configuration.18.The method according to any of claims 15 to 17, wherein:the L1 measurement report MAC CE and the second L1 measurement report MAC CE have different MAC CE formats according to one of the following:different information of the first N octets,different logical channel identifiers (LCIDs) , ordifferent extended logical channel identifiers (eLCIDs) .19.The method according to any of claims 15 to 17, wherein:the L1 measurement report MAC CE and the second L1 measurement report MAC CE have a same MAC CE format with comprising information of the first N octets, according to one of the following:different field values of the first N octets, orsame field values of the first N octets.20.The method according to any of claims 18 to 19, wherein:the second L1 measurement report MAC CE comprises all beams with differential measurement values; orthe second L1 measurement report MAC CE comprises one beam with a highest measurement value and other beams with differential measurement values.21.The method according to any of claims 18 to 20, wherein:the UE determines that a last L1 measurement report MAC CE comprises a field indicating the last L1 measurement report MAC CE.22.The method according to any of claims 1 to 21, wherein:the UE determines the L1 measurement report MAC CE is truncated according to at least one of the following:excluding measurement result information for each type of the beams;comprising a portion of following beam types: Type-1, Type-2, Type-3, or Type-4; orcomprising N beams with highest measurement values for each beam type, wherein N is a pre-defined integer.23.The method according to any of claims 1 to 22, wherein:in response to more than one L1 measurement reporting procedures overlapping in one reporting occasion, the UE combines the more than one L1 measurement reporting procedures and sends the combined L1 measurement reporting, which applies to at least one of the following:all beams that are associated with one L1 measurement reporting configuration,all beams that are associated with one neighbor cell,all beams that are associated with one candidate identifier (ID) , orall beams that are associated with different reporting configurations.24.The method according to any of claims 1 to 22, wherein:in response to more than one L1 measurement reporting procedures overlapping in one reporting occasion, the UE only sends the L1 measurement report that is triggered by fulfillment of the entering condition.25.The method according to any of claims 1 to 24, wherein:for each follow-up periodical reporting, the UE only sends the L1 measurement report when at least one of following conditions is satisfied:for the same L1 measurement reporting configuration, the triggered beam list or the reported beam list becomes different compared with last reported L1 measurement report, orfor the same L1 measurement reporting configuration, the triggered beam list or the reported beam list is the same as last reported L1 measurement report, but the best beam or best N beams becomes different compared with the last reported L1 measurement report, wherein N is a pre-configured or pre-defined integer.26.The method according to claim 25, wherein:the triggered beam list or the reported beam list corresponds to the target beams only.27.A wireless communications apparatus comprising at least one processor and a memory, wherein the at least one processor is configured to read instructions from the memory and implement the method recited in any of claims 1 to 26.28.A computer-readable medium comprising instructions which, when executed by a computer, causing the computer to carry out the method recited in any of claims 1 to 26.