Devices and methods for communication
The terminal device efficiently acquires and transmits CSI reports during L1/L2 triggered mobility-related cell switches, addressing communication continuity challenges by determining and reporting essential CSI metrics, thereby enhancing network performance.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- NEC CORP
- Filing Date
- 2024-11-06
- Publication Date
- 2026-05-15
AI Technical Summary
Existing technologies face challenges in ensuring continuous communication during layer 1/layer 2 (L1/L2) triggered mobility-related cell switches by effectively acquiring channel state information (CSI) in wireless communication systems.
The terminal device is configured to receive LTM-related configurations and cell switch commands, determine CSI-related information, and generate CSI reports that include CSI-reference signal resource indicator (CRI), rank indicator (RI), precoding matrix indicator (PMI), channel quality indicator (CQI), or layer indicator (LI), and transmit these reports efficiently during cell switches.
This approach ensures seamless communication by enabling accurate and timely CSI acquisition during cell switches, minimizing disruptions and enhancing network performance.
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Figure CN2024130321_15052026_PF_FP_ABST
Abstract
Description
DEVICES AND METHODS FOR COMMUNICATION
[0001] FIELDS
[0002] Example embodiments of the present disclosure generally relate to the field of communication techniques and in particular, to devices and methods for channel state information (CSI) acquisition during a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related cell switch.BACKGROUND
[0003] In order to ensure the communication continuousness in the wireless communication system, multiple technologies are proposed, such as a cell switch. During the cell switch, the terminal device may switch among different cells. Further, technology of LTM is used for enabling the cell switch. More specifically, user equipment (UE) may report measurement reports to the network device, and the LTM procedure may be triggered by the network device. When the network device makes an LTM decision, the network device may transmit a cell switch command (CSC) to the terminal device.SUMMARY
[0004] In general, embodiments of the present disclosure provide a solution for CSI acquisition during an LTM-related cell switch.
[0005] In a first aspect, there is provided a terminal device. The terminal device comprises: a processor configured to cause the terminal device to: receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; receive, from the network device, a cell switch command indicating a first cell of the at least one first cell; determine channel state information (CSI) -related information of the first cell based on at least one of the following: the first cell indicated by the cell switch command, a transmission configuration indicator (TCI) state indicated by the cell switch command, a report quantity of a first CSI report configuration associated with the first cell, a codebook type of the first CSI report configuration, or a CSI trigger state indicated selected by a control command; and generate a CSI report based on the CSI-related information, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0006] In a second aspect, there is provided a terminal device. The terminal device comprises: a processor configured to cause the terminal device to: receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; and determine a first CSI report for a first cell of the at least one first cell, wherein the first CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) , and wherein a first priority of the first CSI report is lower than a second priority of a second CSI report which carries layer 1 reference signal received power (L1-RSRP) and / or layer 1 signal to interference plus noise ratio (L1-SINR) .
[0007] In a third aspect, there is provided a terminal device. The terminal device comprises: a processor configured to cause the terminal device to: receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; receive, from the network device, a cell switch command indicating a first cell of the at least one first cell; and determine a priority of a CSI report for the first cell according to an approach defined for determining a priority of an aperiodic CSI report, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0008] In a fourth aspect, there is provided a terminal device. The terminal device comprises: a processor configured to cause the terminal device to: receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; determine a priority of a channel state information (CSI) report for a first cell based on at least one of the following: a measurement result of the first cell, at least one transmission configuration indicator (TCI) state activated for the first cell, a time domain location of a latest CSI-reference signal (CSI-RS) resource associated with the CSI report, or a time domain location of the CSI reference resource associated with the CSI report.
[0009] In a fifth aspect, there is provided a terminal device. The terminal device comprises: a processor configured to cause the terminal device to: receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; receive, from the network device, a cell switch command indicating a first cell of the at least one first cell; and transmit a channel state information (CSI) report for the first cell, wherein the CSI report occupies at least one CSI processing unit (CPU) from one of the following: a first symbol after transmitting a physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) with hybrid automatic repeat request (HARQ) -related information corresponding to a physical downlink shared channel (PDSCH) carrying the cell switch command, or a first symbol after a pre-defined time duration after transmitting the PUCCH or PUSCH.
[0010] In a sixth aspect, there is provided a terminal device. The terminal device comprises: a processor configured to cause the terminal device to: receive, from a network device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured, wherein the network device provides at least one CSI report configuration is configured in a serving cell; receive, from the network device, a cell switch command indicating a first cell of the at least one first cell; and determine, based on the at least one CSI report configuration configured in the serving cell, at least one CSI report for reporting CSI information of the first cell; and transmit the at least one CSI report to the first cell.
[0011] In a seventh aspect, there is provided a network device. The network device comprises: a processor configured to cause the network device to: transmit, to a terminal device served by the network device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; transmit, to the terminal device, a cell switch command indicating a first cell of the at least one first cell; receive, from the terminal device, a channel state information (CSI) report of the first cell generated by the terminal device based on the CSI-related information of the first cell, the CSI-related information being determined by the terminal device based on at least one of the following: the first cell indicated by the cell switch command, a transmission configuration indicator (TCI) state indicated by the cell switch command, a report quantity of a first CSI report configuration associated with the first cell, a codebook type of the first CSI report configuration, or a CSI trigger state indicated selected by a control command, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0012] In an eighth aspect, there is provided a communication method performed by a terminal device. The method comprises: receiving, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; receiving, from the network device, a cell switch command indicating a first cell of the at least one first cell; determining channel state information (CSI) -related information of the first cell based on at least one of the following: the indicated by the cell switch command, a transmission configuration indicator (TCI) state indicated by the cell switch command, a report quantity of a first CSI report configuration associated with the first cell, a codebook type of the first CSI report configuration, or a CSI trigger state indicated selected by a control command; and generating a CSI report based on the CSI-related information, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0013] In a ninth aspect, there is provided a communication method performed by a terminal device. The method comprises: receiving, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; and determining a first CSI report for a first cell of the at least one first cell, wherein the first CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) , and wherein a first priority of the first CSI report is lower than a second priority of a second CSI report which carries layer 1 reference signal received power (L1-RSRP) and / or layer 1 signal to interference plus noise ratio (L1-SINR) .
[0014] In a tenth aspect, there is provided a communication method performed by a terminal device. The method comprises: receiving, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; receiving, from the network device, a cell switch command indicating a first cell of the at least one first cell; and determining a priority of a CSI report for the first cell according to an approach defined for determining a priority of an aperiodic CSI report, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0015] In an eleventh aspect, there is provided a communication method performed by a terminal device. The method comprises: receiving, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; determining a priority of a channel state information (CSI) report for a first cell based on at least one of the following: a measurement result of the first cell, at least one transmission configuration indicator (TCI) state activated for the first cell, a time domain location of a latest CSI-reference signal (CSI-RS) resource associated with the CSI report, or a time domain location of the CSI reference resource associated with the CSI report.
[0016] In a twelfth aspect, there is provided a communication method performed by a terminal device. The method comprises: receiving, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; receiving, from the network device, a cell switch command indicating a first cell of the at least one first cell; and transmitting a channel state information (CSI) report for the first cell, wherein the CSI report occupies at least one CSI processing unit (CPU) from one of the following: a first symbol after transmitting a physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) with hybrid automatic repeat request (HARQ) -related information corresponding to a physical downlink shared channel (PDSCH) carrying the cell switch command, or a first symbol after a pre-defined time duration after transmitting the PUCCH or PUSCH.
[0017] In a thirteenth aspect, there is provided a communication method performed by a terminal device. The method comprises: receiving, from a network device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured, wherein the network device provides at least one CSI report configuration is configured in a serving cell; receiving, from the network device, a cell switch command indicating a first cell of the at least one first cell; and determining, based on the at least one CSI report configuration configured in the serving cell, at least one CSI report for reporting CSI information of the first cell; and transmitting the at least one CSI report to the first cell.
[0018] In a fourteenth aspect, there is provided a communication method performed by a network device. The method comprises: transmitting, to a terminal device served by the network device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; transmitting, to the terminal device, a cell switch command indicating a first cell of the at least one first cell; receiving, from the terminal device, a channel state information (CSI) report of the first cell generated by the terminal device based on the CSI-related information of the first cell, the CSI-related information being determined by the terminal device based on at least one of the following: the indicated by the cell switch command, a transmission configuration indicator (TCI) state indicated by the cell switch command, a report quantity of a first CSI report configuration associated with the first cell, a codebook type of the first CSI report configuration, or a CSI trigger state indicated selected by a control command, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0019] In a fifteenth aspect, there is provided a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to carry out the method according to the eighth, ninth, tenth, eleventh, twelfth, thirteenth, or fourteenth aspect.
[0020] Other features of the present disclosure will become easily comprehensible through the following description.BRIEF DESCRIPTION OF THE DRAWINGS
[0021] Through the more detailed description of some example embodiments of the present disclosure in the accompanying drawings, the above and other objects, features and advantages of the present disclosure will become more apparent, wherein:
[0022] FIG. 1 illustrates an example communication environment in which example embodiments of the present disclosure can be implemented;
[0023] FIG. 2 illustrates a signaling flow of an LTM procedure;
[0024] FIG. 3A to FIG. 3C illustrates signaling flows of CSI acquisition procedure according to some example embodiments of the present disclosure;
[0025] FIG. 4 illustrates a signaling flow of CSI acquisition procedure according to some example embodiments of the present disclosure;
[0026] FIG. 5 illustrates a flowchart of a communication method implemented at a terminal device according to some example embodiments of the present disclosure;
[0027] FIG. 6 illustrates a flowchart of a communication method implemented at a terminal device according to some example embodiments of the present disclosure;
[0028] FIG. 7 illustrates a flowchart of a communication method implemented at a terminal device according to some example embodiments of the present disclosure;
[0029] FIG. 8 illustrates a flowchart of a communication method implemented at a terminal device according to some example embodiments of the present disclosure;
[0030] FIG. 9 illustrates a flowchart of a communication method implemented at a terminal device according to some example embodiments of the present disclosure;
[0031] FIG. 10 illustrates a flowchart of a communication method implemented at a terminal device according to some example embodiments of the present disclosure;
[0032] FIG. 11 illustrates a flowchart of a communication method implemented at a network device according to some example embodiments of the present disclosure;
[0033] FIG. 12 illustrates a simplified block diagram of an apparatus that is suitable for implementing example embodiments of the present disclosure.
[0034] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION
[0035] Principle of the present disclosure will now be described with reference to some example embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. Embodiments described herein can be implemented in various manners other than the ones described below.
[0036] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skills in the art to which this disclosure belongs.
[0037] As used herein, the term ‘terminal device’ refers to any device having wireless or wired communication capabilities. Examples of the terminal device include, but not limited to, user equipment (UE) , personal computers, desktops, mobile phones, cellular phones, smart phones, personal digital assistants (PDAs) , portable computers, tablets, wearable devices, internet of things (IoT) devices, Ultra-reliable and Low Latency Communications (URLLC) devices, Internet of Everything (IoE) devices, machine type communication (MTC) devices, devices on vehicle for V2X communication where X means pedestrian, vehicle, or infrastructure / network, devices for Integrated Access and Backhaul (IAB) , Space borne vehicles or Air borne vehicles in Non-terrestrial networks (NTN) including Satellites and High Altitude Platforms (HAPs) encompassing Unmanned Aircraft Systems (UAS) , eXtended Reality (XR) devices including different types of realities such as Augmented Reality (AR) , Mixed Reality (MR) and Virtual Reality (VR) , the unmanned aerial vehicle (UAV) commonly known as a drone which is an aircraft without any human pilot, devices on high speed train (HST) , or image capture devices such as digital cameras, sensors, gaming devices, music storage and playback appliances, or Internet appliances enabling wireless or wired Internet access and browsing and the like. The ‘terminal device’ can further have ‘multicast / broadcast’ feature, to support public safety and mission critical, V2X applications, transparent IPv4 / IPv6 multicast delivery, IPTV, smart TV, radio services, software delivery over wireless, group communications and IoT applications. It may also incorporate one or multiple Subscriber Identity Module (SIM) as known as Multi-SIM. The term “terminal device” can be used interchangeably with a UE, a mobile station, a subscriber station, a mobile terminal, a user terminal or a wireless device.
[0038] The term “network device” refers to a device which is capable of providing or hosting a cell or coverage where terminal devices can communicate. Examples of a network device include, but not limited to, a Node B (NodeB or NB) , an evolved NodeB (eNodeB or eNB) , a next generation NodeB (gNB) , a transmission reception point (TRP) , a remote radio unit (RRU) , a radio head (RH) , a remote radio head (RRH) , an IAB node, a low power node such as a femto node, a pico node, a reconfigurable intelligent surface (RIS) , and the like.
[0039] The terminal device or the network device may have Artificial intelligence (AI) or Machine learning capability. It generally includes a model which has been trained from numerous collected data for a specific function, and can be used to predict some information.
[0040] The terminal or the network device may work on several frequency ranges, e.g., FR1 (e.g., 450 MHz to 6000 MHz) , FR2 (e.g., 24.25GHz to 71GHz) , frequency band larger than 100 GHz as well as Tera Hertz (THz) . It can further work on licensed / unlicensed / shared spectrum. The terminal device may have more than one connection with the network devices under Multi- Radio Dual Connectivity (MR-DC) application scenario. The terminal device or the network device can work on full duplex, flexible duplex and cross division duplex modes.
[0041] The embodiments of the present disclosure may be performed in test equipment, e.g., signal generator, signal analyzer, spectrum analyzer, network analyzer, test terminal device, test network device, channel emulator. In some embodiments, the terminal device may be connected with a first network device and a second network device. One of the first network device and the second network device may be a master node and the other one may be a secondary node. The first network device and the second network device may use different radio access technologies (RATs) . In some embodiments, the first network device may be a first RAT device and the second network device may be a second RAT device. In some embodiments, the first RAT device is eNB and the second RAT device is gNB. Information related with different RATs may be transmitted to the terminal device from at least one of the first network device or the second network device. In some embodiments, first information may be transmitted to the terminal device from the first network device and second information may be transmitted to the terminal device from the second network device directly or via the first network device. In some embodiments, information related with configuration for the terminal device configured by the second network device may be transmitted from the second network device via the first network device. Information related with reconfiguration for the terminal device configured by the second network device may be transmitted to the terminal device from the second network device directly or via the first network device.
[0042] As used herein, the singular forms ‘a’ , ‘an’a nd ‘the’a re intended to include the plural forms as well, unless the context clearly indicates otherwise. The term ‘includes’a nd its variants are to be read as open terms that mean ‘includes, but is not limited to. ’ The term ‘based on’ is to be read as ‘at least in part based on. ’ The term ‘one embodiment’a nd ‘an embodiment’a re to be read as ‘at least one embodiment. ’ The term ‘another embodiment’ is to be read as ‘at least one other embodiment. ’ The terms ‘first, ’ ‘second, ’a nd the like may refer to different or same objects. Other definitions, explicit and implicit, may be included below.
[0043] In some examples, values, procedures, or apparatus are referred to as ‘best, ’ ‘lowest, ’ ‘highest, ’ ‘minimum, ’ ‘maximum, ’ or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
[0044] As used herein, the term “resource, ” “transmission resource, ” “uplink resource, ” or “downlink resource” may refer to any resource for performing a communication, such as a resource in time domain, a resource in frequency domain, a resource in space domain, a resource in code domain, or any other resource enabling a communication, and the like. In the following, unless explicitly stated, a resource in both frequency domain and time domain will be used as an example of a transmission resource for describing some example embodiments of the present disclosure. It is noted that example embodiments of the present disclosure are equally applicable to other resources in other domains.
[0045] As discussed above, in order to ensure the communication continuousness in the wireless communication system, multiple technologies are proposed, such as cell switch. During the cell switch, the terminal device may switch among different cells.
[0046] In release 19, measurements related enhancements for purpose of supporting LTM will be considered and specified. Measurements related enhancements for purpose of supporting LTM include the following: Measurement related enhancements are applicable to Intra-centralized unit (CU) master cell group (MCG) / secondary cell group (SCG) LTM and Inter-CU MCG / SCG LTM; Specify necessary components to support event triggered L1 measurement reporting; Specify support for CSI-RS measurements for LTM procedures and enable CSI-RS based beam management; and Specify CSI acquisition on candidate cell (s) based on CSI-RS before or during LTM cell switch.
[0047] In the context of the present disclosure, CSI may comprise at least one of CSI-RS resource indicator (CRI) , synchronization signal block (SSB) resource indicator (SSBRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) , layer indicator (LI) , i1, i2, Layer 1 reference signal received power (L1-RSRP) , layer 1 signal to interference plus noise ratio (L1-SINR) . ‘Perform CSI measurement and / or CSI reporting’ may comprise at least one of : receiving CSI-RS, calculating CSI, reporting CSI, maintaining (or store, keep) CSI, updating CSI.
[0048] In the context of the present disclosure, ‘LTM CSI report’ may refer to a CSI report configured for reporting CSI of / for at least one candidate cell, or a CSI report whose associated CSI measurement resource or resource set (e.g., a set of CSI-RS or SSB resources) may be associated with at least one candidate cell. L1 may refer to physical layer. L2 refers to media access control (MAC) layer. L1 command / signaling may refer to downlink control information (DCI) . Layer 2 (L2) command / signaling may refer to MAC CE. (Higher layer) parameter may refer to a radio resource control (RRC) IE (information element) .
[0049] Further, a source cell or target cell may be a candidate cell, where a candidate cell may be one of a set of candidate cells configured by RRC. In the set of configured candidate cells, a candidate cell other than the source cell may be called ‘neighbor cell’ .
[0050] In the context of the present disclosure, LTM may be interchangeably with mobility, cell switch, handover, L1 / L2 mobility, conditional LTM, conditional mobility, conditional cell switch. Cell may be interchangeably with bandwidth part (BWP) , downlink (DL) BWP, uplink (UL) BWP, active (DL or UL) BWP, frequency band, frequency range, (DL or UL) component carrier (CC) , CC group, primary cell (PCell ) , secondary cell (SCell ) , Primary secondary cell (PCell ) , special cell (SpCell ) , MCG, SCG, transmission reception point (TRP) , TRP ID, CORESET pool index.
[0051] In the context of the present disclosure, candidate cell may be interchangeably with cell, (LTM) candidate cell / configuration, target cell, serving cell. A set of candidate cells may comprise the SpCell or not comprise the SpCell. Candidate cell can be represented (or indicated) by candidate cell ID. Source cell may be interchangeably with serving cell, PSCell. Candidate cell ID may be interchangeably with LTM configuration ID, BWP ID, physical cell identity (PCI) , TRP ID, CORESET pool index.
[0052] LTM CSI report may be interchangeably with CSI report, measurement report, event triggered report, event triggered and periodic report, periodic (P) / semi-persistent (SP) / aperiodic (AP) LTM CSI report, P / SP / AP CSI report, SP CSI report based on physical uplink control channel (PUCCH) , SP CSI report based on physical uplink shared channel (PUSCH) .
[0053] MAC CE or DCI may be interchangeably with activation command, selection command, sub selection command.
[0054] Beam may be interchangeably with (Tx / Rx) beam, beam direction / orientation, RS (e.g., CSI-RS, SSB, sounding reference signal, SRS) , RS resource, TCI state, Quasi Co-Location (QCL) RS (e.g., QCL-typeD RS) , measurement RS, measurement RS resource, path-loss RS. Beam can be replaced or represented by beam ID, where the beam ID may be interchangeably with (Tx / Rx) beam ID, RS (e.g., CSI-RS, SSB, SRS) ID, RS resource ID (e.g., CRI, SSBRI) , TCI state ID, QCL RS (e.g., QCL-typeD RS) ID, measurement RS ID, measurement RS resource ID, path-loss RS ID. Beam ID may comprise CRI (CSI-RS resource indicator) or / and SSBRI (SSB resource indicator) .
[0055] TCI state may be interchangeably with LTM TCI state, conditional LTM TCI state, unified TCI state, joint TCI state, DL TCI state, UL TCI state, DL or joint TCI state. TCI state may be represented or indicated by TCI state ID.
[0056] Trigger may be interchangeably with indicate, schedule, select, activate, configure, provide, comprise. CSI-RS may be interchangeably with non-zero power (NZP) CSI-RS, zero power (ZP) CSI-RS, SSB, TRS (tracking reference signal) , sounding reference signal (SRS) .
[0057] UE capability (information) may be interchangeably with UL RRC message, UE assistance information (UAI) . UE (or NW) may be interchangeably with over the top (OTT) (server) , OAM (Operation, Administration and Maintenance, server) , core network (CN, server) , edge cloud (server) , TRP, (serving cell) cell.
[0058] ID may be interchangeably with identity, identifier, indication, indicator, index, flag. ‘When’ may be interchangeably with ‘if’ or ‘after’ . ‘A may be associated with / to B’ may be interchangeably with A / B corresponds to B / A, A / B maps to B / A, A / B comprises B / A, A / B indicates B / A, A / B may be determine based on B / A, A / B may be applied to / for B / A.
[0059] Principles and implementations of the present disclosure will be described in detail below with reference to the figures.
[0060] Example Environments
[0061] FIG. 1 shows an example communication environment 100 in which example embodiments of the present disclosure can be implemented. The network communication 100 includes a terminal device 110, a network device 120-1 and an optional network devices 120-2 and 120-3. In the following text, the network devices 120-1, 120-2 and 120-3 are collectively referred to as the network devices 120 or individually referred to as the network device 120. Additionally, the network devices 120 may provide one or more coverage areas, also called as cells.
[0062] As illustrated in FIG. 1, the communication environment 100 includes a second cell 140, a first cell 130-1 and an optional first cell 130-2. In the following text, cell 130-1 and cell 130-2 are collectively referred to as the first cell 130.
[0063] In some embodiments, different cells may be provided by different network device 120. Alternatively, in some embodiments, a same network device 120 may provide more than one cell. For example, in some embodiments, the second cell 140, the first cell 130-1 and the first cell 130-2 may be provided by the network device 120-1. In some other embodiments, the second cell 140, the first cell 130-1 and the first cell 130-2 may be provided by the network device 120-1, the network device 120-2 and the network device 120-3, respectively.
[0064] In addition, in the example of FIG. 1, the terminal device 110 may move over time. As illustrated in FIG. 1, the terminal device 110 locates at different positions at different time points (T1 and T2) . When moving, the terminal device 110 may switch among different cells.
[0065] In the example FIG. 1, the terminal device 110 is serving by the second cell 140. Further, the terminal device 120 may be configured to measure the first cells 130. Based on the measurement result, the terminal device 120 may report measurement result to the network device 120.
[0066] In the communication environment 100, a direction from the terminal device 110 to the network device 120 is referred to as an uplink, while a direction from the network device 120 to the terminal device 110 is referred to as a downlink. In downlink, the network device 120 is a transmitting (TX) device (or a transmitter) and the terminal device 110 is a receiving (RX) device (or a receiver) . In uplink, the terminal device 110 is a TX device (or a transmitter) and the network device 120 is a RX device (or a receiver) .
[0067] It is to be understood that the number of devices and their connections in FIG. 1 are given for the purpose of illustration without suggesting any limitations to the present disclosure. The communication environment 200 may include any suitable number of network devices and / or terminal devices and / or coverage areas for implementing implementations of the present disclosure.
[0068] The communications in the communication environment 100 may conform to any suitable standards including, but not limited to, Global System for Mobile Communications (GSM) , Long Term Evolution (LTE) , LTE-Evolution, LTE-Advanced (LTE-A) , New Radio (NR) , Wideband Code Division Multiple Access (WCDMA) , Code Division Multiple Access (CDMA) , GSM EDGE Radio Access Network (GERAN) , Machine Type Communication (MTC) and the like. The embodiments of the present disclosure may be performed according to any generation communication protocols either currently known or to be developed in the future. Examples of the communication protocols include, but not limited to, the first generation (1G) , the second generation (2G) , 2.5G, 2.75G, the third generation (3G) , the fourth generation (4G) , 4.5G, the fifth generation (5G) communication protocols, 5.5G, 5G-Advanced networks, or the sixth generation (6G) networks.
[0069] Work Principle and Example Signaling for Communication
[0070] As discussed above, in order to ensure the communication continuousness in the wireless communication system, multiple technologies are proposed, such as cell switch. During the cell switch, the terminal device may switch among different cells.
[0071] Further, an LTM procedure is used for enabling the cell switch. Reference is now made to FIG. 2, which illustrates a signaling flow of an LTM procedure.
[0072] In the example of FIG. 2, TCI state activation by medium access control (MAC) control element (CE) before cell switch command for one or more candidate cells may be allowed.
[0073] In addition, after random access channel (RACH) procedure until a new TCI state is indicated by the target cell, a UE follows the indicated TCI-state in the cell switch command at least for contention free random access (CFRA) triggered by cell switch command.
[0074] As illustrated in FIG. 2, during the LTM preparation, the UE may transmit layer 1 (L1) measurement report to the source cell.
[0075] In FIG. 2, an early TCI activation may be performed. As illustrated in FIG. 2, the MAC CE may be used for the TCI state activation for candidate cell (s) before the CSC.
[0076] In FIG. 2, the source cell may send a CSC to the UE to trigger the LTM procedure. In some embodiments, at least the following information may be included in the CSC: information used to identify the target cells, TA related information, one joint or one pair of UL and DL unified TCI state index for the target cell. Further, in some embodiments, the CSC may be used for activating the bandwidth parts (BWPs) for the target cell. In some embodiments, beam indication may be an RS identifier or TCI state index.
[0077] In some embodiments, in order to minimize beam (or TCI state) interruption time during the handover (i.e., cell switch) in the LTM procedure, the source cell may utilize the transmitted CSC to indicate a TCI state from a set of activated TCI states for the target cell to the UE. Thus, after the handover, the UE may immediately apply the indicated TCI state for the target cell to effectively receive or transmit DL or UL signal on the target cell.
[0078] Several CSI acquisition procedures during the LTM-related cell switch procedure will be discussed with reference to FIG. 3A to FIG. 3C.
[0079] In the example of FIG. 3A, the CSI-RS measurement and CSI reporting operations are performed before reception of LTM CSC MAC CE (i.e., cell switch command) . As illustrated in FIG. 3A, CSI-RSs are transmitted (302) from the candidate cell to the terminal device. Before receiving (306) the LTM CSC MAC CE, the terminal device transmits (304) a CSI report to the serving cell. If needed, the CSI report is forwarded (305) from the serving cell to the candidate / target cell (s) via an Xn message.
[0080] In the example of FIG. 3B, the CSI-RS measurement may be started before reception of LTM CSC MAC CE and CSI reporting operation may be performed after reception of LTM CSC MAC CE. As illustrated in FIG. 3B, CSI-RSs are transmitted (312) from the candidate cell to the terminal device and the CSI-RS measurement may be performed. After receiving (314) the LTM CSC MAC CE, the terminal device transmits (316) a CSI report to the candidate / target cell (s) directly based on previous measurement results.
[0081] In the example of FIG. 3C, the CSI-RS measurement and CSI reporting operations are performed after reception of LTM CSC MAC CE. As illustrated in FIG. 3C, LTM CSC MAC CE is transmitted (322) from the serving cell to the terminal device. After receiving the LTM CSC MAC CE, the terminal device receives (324) CSI-RSs from the candidate / target cell (s) (i.e., start the CSI-RS measurement) , and then the CSI report is sent (326) to target cell directly based on the measurement result.
[0082] According to current specification as follows, if the CSI report including LTM CSI report is configured in CSI-MeasConfig, the CSI report is transmitted on the serving cell. Specifically, the IE CSI-MeasConfig is used to configure CSI-RS (reference signals) belonging to the serving cell in which CSI-MeasConfig is included, channel state information reports to be transmitted on PUCCH on the serving cell in which CSI-MeasConfig is included and channel state information reports on PUSCH triggered by DCI received on the serving cell in which CSI-MeasConfig is included.
[0083] However, especially for the example in FIG. 3B and FIG. 3C, the CSI report should be transmitted on the LTM target cell. Therefore, enhancements may be defined in order to support the example in FIG. 3B and FIG. 3C.
[0084] According to some example embodiments of the present disclosure, for a LTM CSI report configured in CSI-MeasConfig (configured in the serving cell or source cell) , if the LTM CSI report is triggered for reporting CSI for the LTM target cell, the LTM CSI report is transmitted on the LTM target cell.
[0085] In the example of FIG. 3B and FIG. 3C, the terminal device 110 receives an LTM-related configuration indicating at least one first cell 130 to be measured from a network device 120-1, where the network device 120-1 provides at least one CSI report configuration is configured in a serving cell. Then the terminal device 110 receives a cell switch command indicating a first cell 130 of the at least one first cell 130 from the network device 120-1.
[0086] If the terminal device determines at least one CSI report for reporting CSI information of the first cell 130 based on the at least one CSI report configuration configured in the serving cell, the terminal device 110 transmits the at least one CSI report to the first cell 130.
[0087] In some embodiments, the CSI report may carry at least one of the following: CRI, RI, PMI, CQI or LI.
[0088] In the following, more details about how to support CSI acquisition during the LTM-related cell switch will be discussed with reference to FIG. 4, which illustrates a signaling flow 400 of CSI acquisition procedure according to some example embodiments of the present disclosure. FIG. 4 will be discussed with reference to FIG. 1, for example, by using the terminal device 110, the network device 120, the first cells 130-1 and 130-2, and the second cell 140.
[0089] In the following descriptions, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are contained in the above discussions, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to particular embodiments. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable sub-combination.
[0090] It is to be understood that the operations at the terminal device 110 and the network device 120 should be coordinated. In other words, the network device 120 and the terminal device 110 should have common understanding about configurations, parameters and so on.Such common understanding may be implemented by any suitable interactions between the network device 120 and the terminal device 110 or both the network device 120 and the terminal device 110 applying the same rule / policy. In the following, although some operations are described from a perspective of the terminal device 110, it is to be understood that the corresponding operations should be performed by the network device 120. Similarly, although some operations are described from a perspective of the network device 120, it is to be understood that the corresponding operations should be performed by the terminal device 110. Merely for brevity, some of the same or similar contents are omitted here.
[0091] In the following example embodiments, the terminal device 110 is serving by the second cell 140 / the network device 120-1. Further, the first cells 130-1 and 130-2 are candidate cells for the terminal device 210. In view of this, the first cells 130-1 and 130-2 are referred to as candidate cells 130. If a cell switch for the first cell 130 is triggered, the first cell 130 also may be called as the target cell.
[0092] In FIG. 4, the network device 120-1 which is serving the terminal device 110 (which is providing the servicing cell to the terminal device 110) transmits (410-1) an LTM-related configuration indicating at least one first cell 130 to be measured (such as, an RRC signalling) to the terminal device 110, and the terminal device 110 receives (410-2) the LTM-related configuration accordingly.
[0093] Then, the network device 120-1 transmits (430-1) a cell switch command indicating a first cell 130-1 of the at least one first cell 130 to the terminal device 110, and the terminal device 110 receives (430-2) the cell switch command accordingly. In some embodiments, the cell switch command may be carried in a PDSDH. Further, the PDSDH may be scheduled by another PDCCH / DCI / PDSCH.
[0094] As discussed, during the LTM-related cell switch, in some cases, the terminal device 110 transmits (420-1-1) the CSI report to the network device 120 prior to receiving the cell switch command, and the network device 120 receives (420-2-1) the CSI report accordingly. Alternatively, in some other cases, the terminal device 110 transmits (420-2-1) the CSI report to the network device 120 after receiving the cell switch command, and the network device 120 receives (420-2-2) the CSI report accordingly.
[0095] In some embodiment, the CSI report may carry at least one of the following: CRI, RI, PMI, CQI or LI. That is, the CSI report is used for CSI acquisition during the cell switch.
[0096] Optionally, in some embodiments, the terminal device 110 may receive, from the network device 120-1, an indication indicating the terminal device 110 to transmit the CSI report for the first cell 130, where the indication is comprised in the cell switch command or the LTM-related configuration.
[0097] According to some embodiments of the present disclosure, to obtain CSI information to be reported, the terminal device 110 first determines CSI-related information of the first cell 130 based on at least one of the following: the first cell 130 indicated by the cell switch command, a TCI state indicated by the cell switch command, a report quantity of a first CSI report configuration associated with the first cell 130, a codebook type of the first CSI report configuration, or a CSI trigger state indicated selected by a control command. Then, the terminal device 110 generates a CSI report based on the CSI-related information, where the CSI report carries at least one of the following: CRI, RI, PMI, CQI or LI.
[0098] In some embodiments, the CSI-related information may comprise the first CSI report configuration, and such example embodiments will be discussed below.
[0099] In some embodiments, the terminal device 110 may receive a CSI trigger state from the network device 120-1, where the CSI trigger state is associated with a set of CSI report configurations comprising the first CSI report configuration. In some cases, the CSI trigger state may be received via the cell switch command. In some other cases, the CSI trigger state may be received via downlink control information (DCI / PDCCH) which schedules a physical downlink shared channel (PDSCH) carrying the cell switch command. In some other cases, the CSI trigger state may be received via downlink control information (DCI / PDCCH) transmitted prior to the cell switch command, where the downlink control information (DCI / PDCCH) is different from the downlink control information (DCI / PDCCH) which schedules a physical downlink shared channel (PDSCH) carrying the cell switch command.
[0100] In some embodiments, the terminal device 110 may determine the first CSI report configuration from the set of CSI report configurations based on the first cell 130 indicated by the cell switch command, where the first CSI report configuration is associated with at least one CSI-RS resource or CSI-RS resource set associated with the first cell 130.
[0101] In some embodiments, the terminal device 110 may determine the first CSI report configuration from the set of CSI report configurations based on the TCI state indicated by the cell switch command.
[0102] Specifically, in one embodiment, the first CSI report configuration may be associated with at least one CSI-RS resource or CSI-RS resource set associated with the TCI state indicated by the cell switch command. In another embodiment, the first CSI report configuration may be associated with at least one CSI-RS resource or CSI-RS resource set which is the same as at least one QCL RS associated with the TCI state indicated by the cell switch command. In a further embodiment, the first CSI report configuration may be associated with at least one CSI-RS resource or CSI-RS resource set, where at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one further QCL RS associated with the TCI state indicated by the cell switch command. In a further embodiment, the first CSI report configuration may be associated with at least one CSI-RS resource or CSI-RS resource set, where at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one further QCL RS of at least one further QCL RS associated with the TCI state indicated by the cell switch command.
[0103] In some embodiments, the CSI-related information may comprise a first CSI-RS resource, and the cell switch command may indicate at least one of the following: a first CSI report configuration associated with a set of CSI-RS resources comprising the first CSI-RS resource, or a CSI trigger state associated with the first CSI report configuration.
[0104] Alternatively, in some embodiments, the CSI-related information may comprise a first CSI-RS resource set, and the cell switch command may indicate at least one of the following: a first CSI report configuration associated with a set of CSI-RS resource sets comprising the first CSI-RS resource set, or a CSI trigger state associated with the first CSI report configuration. It is clarified that “determining CSI-RS resource / CSI-RS resource set” may mean “determining CSI measurement configuration or CSI resource configuration” .
[0105] In some embodiments, the terminal device 110 may determine the first CSI-RS resource from the set of CSI-RS resources based on the first cell 130 indicated by the cell switch command, where the first CSI-RS resource is associated with the first cell 130. Alternatively, the terminal device 110 may determine the first CSI-RS resource set from the set of CSI-RS resource sets based on the first cell 130 indicated by the cell switch command, wherein the first CSI-RS resource set is associated with the first cell 130.
[0106] In some embodiments, the terminal device 110 may determine the first CSI-RS resource from the set of CSI-RS resources based on the TCI state indicated by the cell switch command, where the first CSI-RS resource is one of the following:
[0107] -a CSI-RS resource associated with the TCI state indicated by the cell switch command,
[0108] -a CSI-RS resource which is the same as at least one QCL RS associated with the TCI state indicated by the cell switch command,
[0109] -a CSI-RS resource associated with at least one QCL RS, wherein the at least one QCL RS is the same as at least one further QCL RS associated with the TCI state indicated by the cell switch command, or
[0110] -a CSI-RS resource associated with at least one QCL RS, wherein at least one QCL RS of the at least one QCL RS is the same as at least one further QCL RS of at least one further QCL RS associated with the TCI state indicated by the cell switch command.
[0111] In some embodiments, in a case that the terminal device 110 is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, the terminal device 110 may determine the first CSI report configuration from the set of CSI report configurations based on the first cell 130 indicated by the cell switch command, where the first CSI report configuration is associated with at least one CSI-RS resource or CSI-RS resource set associated with the first cell 130.
[0112] Alternatively, in some embodiments, in a case that the terminal device 110 is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, the terminal device 110 may determine the first CSI report configuration from the set of CSI report configurations based on the TCI state indicated by the cell switch command, where the first CSI report configuration is associated with at least one of the following:
[0113] -at least one CSI-RS resource or CSI-RS resource set associated with the TCI state indicated by the cell switch command,
[0114] -at least one CSI-RS resource or CSI-RS resource set which is the same as at least one QCL RS associated with the TCI state indicated by the cell switch command,
[0115] -at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one QCL RS associated with the TCI state indicated by the cell switch command, or
[0116] -at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one QCL RS of at least one QCL RS associated with the TCI state indicated by the cell switch command.
[0117] Alternatively, in some embodiments, in a case that the terminal device 110 is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, the terminal device 110 may determine the first CSI report configuration from the set of CSI report configurations, where a report quantity of the first CSI report configuration comprises at least one of the following: CRI, RI, PMI, CQI or LI.
[0118] Alternatively, in some embodiments, in a case that the terminal device 110 is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, the terminal device 110 may determine the first CSI report configuration from the set of CSI report configurations, where a codebook type of the first CSI report configuration at least comprises Type-1.
[0119] Alternatively, in some embodiments, in a case that the terminal device 110 is configured with a set of CSI report configurations and the CSI-related information comprises a first CSI report configuration, the terminal device 110 may determine the first CSI report configuration from the set of CSI report configurations, where the first report configuration is associated with the CSI trigger state selected by a control command (via such as, RRC, MAC CE, DCI) .
[0120] For a better understanding about the above CSI acquisition procedure, more example embodiments about the present disclosure will be discussed as below.
[0121] According to some example embodiments of the present disclosure, in the example of FIG. 2B and FIG. 2C, NW may indicate UE to aperiodic report CSI for the candidate cell (i.e., target cell, the first cell) based on at least one of the following approaches, where the CSI report is transmitted by the UE after receiving the LTM CSC MAC CE.
[0122] In one example embodiment (referred to option A) , by using CSI request field in the scheduling DCI, the PDCCH scheduling the PDSCH carrying the LTM CSC MAC CE may indicate a CSI AP trigger state, and the (indicated) CSI AP trigger state may be associated with an AP LTM CSI report.
[0123] In another example embodiment (referred to option B) , the LTM CSC MAC CE may indicate a CSI AP trigger state by using a new field (similar to CSI request field in the DCI) in the LTM CSC MAC CE, and the (indicated) CSI AP trigger state may be associated with an AP LTM CSI report. Additionally, in some embodiments, the new field may indicate a CSI AP trigger state. The length of the new field may be 0, 1, 2, 3, 4, 5, or 6 bits which may be determined by higher layer parameter reportTriggerSize.
[0124] In a further example embodiment (referred to option C) , the LTM CSC MAC CE may indicate an ID of LTM CSI report (e.g., LTM-CSI-ReportConfigId) by using a new field in the LTM CSC MAC CE, and the (indicated) ID of LTM CSI report may be associated with an AP LTM CSI report. Additionally, in some embodiments, the new field may indicate the LTM CSI report (i.e., LTM-CSI-ReportConfig) identified by LTM-CSI-ReportConfigId (e.g., as specified in TS 38.331) . The length of the new field may be determined based on the maximum number of configured LTM-CSI-ReportConfigs (e.g., 48) , e.g., 6 bits.
[0125] In a further example embodiment (referred to option D) , the LTM CSC MAC CE may indicate a CSI AP trigger state by using a new field (similar to CSI request field in the DCI) in the LTM CSC MAC CE, and the (indicated) CSI AP trigger state may be associated with an AP LTM CSI report may be associated with one or more than one AP LTM CSI reports. The LTM CSC MAC CE may indicate an AP LTM CSI report from the AP LTM CSI report (s) associated with the (indicated) CSI AP trigger states by using a further new field in the LTM CSC MAC CE. Detailed about the new field and the further new field may refer to the above discussion about the new fields. For brevity, the similar contents are omitted herein.
[0126] In a further example embodiment (referred to option E) , the LTM CSC MAC CE may indicate a new information indicating UE to report CSI for the candidate cell by using a new field in the LTM CSC MAC CE. Additionally, in some embodiments, the new field may whether UE reports CSI for the candidate cell (i.e., the candidate cell indicated by the LTM CSC MAC CE) or not. The length of the new field may be 1 bit. For example, the bit value 1 indicates UE needs to report CSI for the candidate cell, the bit value 0 indicates UE does not need to report CSI for the candidate cell.
[0127] In a further example embodiment (referred to option F) , UE may be provided by NW with a new information (e.g., RRC enabling parameter) indicating / enabling UE to report CSI for the candidate cell before UE receives the LTM CSC MAC CE. For example, if UE is provided with the new information before receiving the LTM CSC MAC CE, when UE receives the LTM CSC MAC CE, UE needs to report CSI for the candidate cell (i.e., candidate cell indicated by the LTM CSC MAC CE) .
[0128] For the above option A or option B, the indicated CSI AP trigger state may be associated with more than one AP LTM CSI report. For example, there may be more than one AP LTM CSI report which are associated with different candidate cells, or different CSI-RSs associated with the same candidate cell. In this case, it is unnecessary (or unrealistic) for UE to perform CSI measurement and / or CSI reporting based on all AP LTM CSI reports. According to some example embodiments of the present disclosure, UE may determine at least one target AP LTM CSI report from the more than one AP LTM CSI reports associated with the indicated CSI AP trigger state based on at least one of the following: the candidate cell indicated by the LTM CSC MAC CE and / or the TCI state indicated by the LTM CSC MAC CE. Then UE may perform CSI measurement and / or CSI reporting based on the at least one target AP LTM CSI report. In this way, unnecessary signaling overhead (e.g., avoid associating each CSI AP trigger state with only one CSI report) , UE power consumption and CSI processing unit (CPU) may be reduced.
[0129] For option A, when the PDCCH indicates a CSI AP trigger state associated with more than one LTM CSI reports (represented by ‘triggered LTM CSI reports’ ) , and if the PDCCH schedules a PDSCH transmission and the PDSCH carries a LTM cell switch command (CSC) MAC CE, i.e., the PDCCH schedules a LTM CSC MAC CE, UE may determine at least one target LTM CSI report from the trigger LTM CSI reports based on at least one of the following: a candidate cell indicated by the LTM CSC MAC CE (represented by ‘LTM target cell’ ) and / or TCI state indicated by the LTM CSC MAC CE.
[0130] For option B, when the LTM CSC MAC CE indicates a CSI AP trigger state associated with more than one LTM CSI reports (represented by ‘triggered LTM CSI reports’ ) , UE may determine at least one target LTM CSI report from the trigger LTM CSI reports based on at least one of the following: candidate cell indicated by the LTM CSC MAC CE, and / or TCI state indicated by the LTM CSC MAC CE.
[0131] In some embodiments, the LTM target cell may be indicated by the Target Configuration ID field in the LTM CSC MAC CE. This field indicates the index of candidate target configuration to apply for LTM cell switch, corresponding to ltm-CandidateId minus 1.
[0132] In some embodiments, the at least one target LTM CSI report may comprise the LTM CSI report (s) associated with the LTM target cell in the triggered LTM CSI reports. In other words, UE may perform CSI measurement and / or CSI reporting based on (measurement related configuration and / or reporting configuration of) the LTM CSI report (s) associated with the LTM target cell. In other words, UE may assume that (measurement related configuration and / or reporting configuration of) the LTM CSI report (s) associated with the LTM target cell is valid (or used, applied) , correspondingly, (measurement related configuration and / or reporting configuration of) the other LTM CSI report (s) not associated with the LTM target cell is invalid (or not used, not applied) .
[0133] In some embodiments, ‘LTM CSI report associated with the LTM target cell’ may comprise the following: the LTM CSI report is associated with at least one CSI-RS or SSB resource or resource set associated with the LTM target cell, where the at least one CSI-RS or SSB resource or resource set is configured as LTM CSI resource.
[0134] In some embodiments, the TCI state may be indicated by the TCI state ID field in the LTM CSC MAC CE. This field may indicate and activate the TCI state for the LTM target cell.
[0135] In some embodiments, the at least one target LTM CSI report may comprise the LTM CSI report (s) associated with the indicated TCI state. In other words, UE may perform CSI measurement and / or CSI reporting based on (measurement related configuration and / or reporting configuration of) the LTM CSI report (s) associated with the indicated TCI state. In other words, UE may assume that (measurement related configuration and / or reporting configuration of) the LTM CSI report (s) associated with the indicated TCI state is valid (or used, applied) , correspondingly, (measurement related configuration and / or reporting configuration of) the other LTM CSI report (s) not associated with the indicated TCI state is invalid (or not used, not applied) .
[0136] ‘LTM CSI report associated with the indicated TCI state’ may comprise the following:
[0137] -The LTM CSI report is associated with at least one CSI-RS resource, which is associated with the indicated TCI state (or associated TCI state ID) . Where the at least one CSI-RS resource is configured as LTM CSI resource.
[0138] -The LTM CSI report is associated with at least one CSI-RS resource, which is the same as at least one QCL RS (e.g., QCL-TypeA RS, QCL-TypeD RS) associated with the indicated TCI state. Where the at least one CSI-RS resource is configured as LTM CSI resource.
[0139] -The LTM CSI report is associated with at least one CSI-RS resource, at least one QCL RS of the at least one CSI-RS resource is the same as at least one QCL RS associated with the indicated TCI state. Where the at least one CSI-RS resource is configured as LTM CSI resource.
[0140] -The LTM CSI report is associated with at least one CSI-RS resource, at least one QCL RS of the at least one CSI-RS resource is the same as at least one QCL RS of at least one QCL RS associated with the indicated TCI state. Where the at least one CSI-RS resource is configured as LTM CSI resource.
[0141] Furthermore, optionally, in some embodiments, if the LTM target cell is associated with more than one LTM CSI reports in the trigger LTM CSI reports, UE may determine the at least one target LTM CSI report from the trigger LTM CSI reports based on the TCI state indicated by the LTM CSC MAC CE; otherwise, i.e., the LTM target cell is associated with only one LTM CSI report in the trigger LTM CSI reports, UE may determine the at least one target LTM CSI report only based on the candidate cell indicated by the LTM CSC MAC CE.
[0142] Furthermore, optionally, UE may also determine the at least one target CSI report based on at least one of the following (in other words, the at least one target CSI report may also satisfy at least one of the following) : the report quantity (or content) associated with the target CSI report comprises at least one of CRI (CSI-RS resource indicator) , RI (rank indicator) , PMI (precoding matrix indicator) , CQI (channel quality indicator) , LI (layer indicator) , and / or the codebook type associated with the CSI report comprises Type- I.
[0143] For option C or D, the indicated LTM CSI report may be associated with more than one CSI-RS resources (configured as CSI measurement resource) , for example, these CSI-RS resources are associated with different candidate cells, or these different CSI-RS resources are associated with the same candidate cell. In this case, it is unnecessary (or unrealistic) for UE to perform CSI measurement and / or CSI reporting based on all CSI-RS resources. According to some example embodiments of the present disclosure, UE may determine at least one target CSI-RS resource from the more than one CSI-RS resources associated with the indicated LTM CSI report based on at least one of the following: The candidate cell indicated by the LTM CSC MAC CE, and / or the TCI state ID indicated by the LTM CSC MAC CE. Then, UE may perform CSI measurement and / or CSI reporting based on the at least one target CSI-RS resource. In this way, unnecessary signaling overhead (e.g., avoid associating each CSI report with only one CSI-RS resource) , UE power consumption and CSI processing unit (CPU) may be reduced.
[0144] For option C or D, when the LTM CSC MAC CE indicates a LTM CSI report associated with more than one CSI-RS resources, UE may determine at least one target CSI-RS resource from the CSI-RS resources associated with the indicated LTM CSI report (represented by ‘associated CSI-RS resources’ ) based on at least one of the following: Candidate cell indicated by the LTM CSC MAC CE (represented by ‘LTM target cell’ ) , and / or TCI state indicated by the LTM CSC MAC CE.
[0145] In some embodiments, the candidate cell may be indicated by the Target Configuration ID field in the LTM CSC MAC CE. This field indicates the index of candidate target configuration to apply for LTM cell switch, corresponding to ltm-CandidateId minus 1. For example, the at least one target CSI-RS resource may comprise the CSI-RS resource (s) associated with the LTM target cell in the associated CSI-RS resources. In other words, UE may perform CSI measurement and / or CSI reporting based on the CSI-RS resource (s) associated with the LTM target cell. In other words, UE may receive the CSI-RS resource (s) associated with the LTM target cell, correspondingly, UE may not receive the other CSI-RS resource (s) not associated with the LTM target cell.
[0146] In some embodiments ‘CSI-RS resource associated with the LTM target cell’ may comprise the following: the CSI-RS resource is associated with the LTM target cell (or associated LTM candidate ID) .
[0147] In some embodiments, the TCI state indicated by the LTM CSC MAC CE may be indicated by the TCI state ID field. This field may indicate and / or activate the TCI state for the LTM target cell.
[0148] In some embodiments, the at least one target CSI-RS resource may comprise the CSI-RS resource (s) associated with the indicated TCI state. In other words, UE may perform CSI measurement and / or CSI reporting based on the CSI-RS resource (s) associated with the indicated TCI state. In other words, UE may receive the CSI-RS resource (s) associated with the indicated TCI, correspondingly, UE may not receive the other CSI-RS resource (s) not associated with the indicated TCI state.
[0149] In some embodiments, ‘CSI-RS resource associated with the indicated TCI state’ may comprise the following:
[0150] -The CSI-RS resource is associated with the indicated TCI state (or associated TCI state ID) .
[0151] -The CSI-RS resource is the same as at least one QCL RS (e.g., QCL-TypeA RS, QCL-TypeD RS) associated with the indicated TCI state.
[0152] -The CSI-RS resource is associated with at least one QCL RS, which is the same as at least one QCL RS associated with the indicated TCI state.
[0153] -The CSI-RS resource is associated with at least one QCL RS, at least one QCL RS of the at least one QCL RS is the same as at least one QCL RS of at least one QCL RS associated with the indicated TCI state.
[0154] Furthermore, optionally, in some embodiments, if the LTM target cell is associated with more than one CSI-RS resources in the associated CSI-RS resources, UE may determine the at least one target CSI-RS resource from the associated CSI-RS resources based on the TCI state indicated by the LTM CSC MAC CE; otherwise, i.e., the LTM target cell is associated with only one CSI-RS resource in the associated CSI-RS resources, UE may determine the at least one target CSI-RS resource only based on the candidate cell indicated by the LTM CSC MAC CE.
[0155] In some embodiments, for option E or F, the AP LTM CSI report for the candidate cell may be triggered by the LTM CSC MAC CE implicitly. In this case, UE needs to determine a LTM CSI report (i.e., LTM-CSI-ReportConfig, represented by ‘target LTM CSI report’ ) from a set of configured LTM CSI reports to determine corresponding measurement configuration and / or reporting configuration to report CSI for the candidate cell. How to determine the target LTM CSI report from the configured / selected from the set of configured LTM CSI reports needs to be specified.
[0156] For option E or F, in some embodiments, UE may determine at least one target LTM CSI report from a set of configured LTM CSI reports based on the following: The candidate cell indicated by the LTM CSC MAC CE (represented by ‘LTM target cell’ ) ; The TCI state indicated by the LTM CSC MAC CE; Report quantity of LTM CSI report; Codebook type of LTM CSI report; CSI AP trigger states selected by MAC CE. Then, UE may perform CSI measurement and / or CSI reporting based on the at least one target LTM CSI report. In this way, unnecessary signaling overhead, UE power consumption and CSI processing unit (CPU) may be reduced.
[0157] For option E, in some embodiments When the LTM CSC MAC CE indicates a new information indicating UE to report CSI information for candidate cell (i.e., the candidate cell indicated by the LTM CSC MAC CE) , UE may determine at least one target LTM CSI report (e.g., AP LTM CSI report) from a set of LTM CSI reports configured by RRC, and then UE may perform CSI measurement and / or CSI reporting for the indicated candidate cell based on the at least one target LTM CSI report, where the at least one target LTM CSI report can be determined based on at least one of the following: The candidate cell indicated by the LTM CSC MAC CE (represented by ‘LTM target cell’ ) ; The TCI state indicated by the LTM CSC MAC CE; Report quantity of LTM CSI report; Codebook type of LTM CSI report; CSI AP trigger states selected by MAC CE.
[0158] In some embodiments, the at least one target LTM CSI report may comprise the configured LTM CSI report (s) associated with the LTM target cell in the triggered LTM CSI reports.
[0159] In some embodiments, the at least one target LTM CSI report may comprise the configured LTM CSI report (s) associated with the indicated TCI state.
[0160] In some embodiments, the report quantity associated with the configured LTM CSI report included in the at least one target CSI report comprises at least one of CRI, RI, PMI, CQI, or LI.
[0161] In some embodiments, the codebook type associated with the configured LTM CSI report included in the at least one target CSI report comprises Type-I.
[0162] In some embodiments, the configured LTM CSI report included in the at least one target CSI report is associated with a selected CSI AP trigger state, which is selected by the MAC CE (e.g., Aperiodic CSI Trigger State Subselection MAC CE) .
[0163] For option F, in some embodiments, when UE receives the LTM CSC MAC CE, and if UE is provided by NW with a new information (e.g., RRC enabling parameter) indicating / enabling UE to report CSI for candidate cell before receiving the LTM CSC MAC CE. UE may determine at least one target LTM CSI report (e.g., AP LTM CSI report) from a set of LTM CSI reports configured by RRC, and then UE may perform CSI measurement and / or CSI reporting for the indicated candidate cell based on the at least one target LTM CSI report. Where the at least one target LTM CSI report can be determined based on at least one of the following: The candidate cell indicated by the LTM CSC MAC CE (represented by ‘LTM target cell’ ) ; The TCI state indicated by the LTM CSC MAC CE; Report quantity of LTM CSI report; Codebook type of LTM CSI report; CSI AP trigger states selected by MAC CE.
[0164] In some embodiments, the at least one target LTM CSI report may comprise the configured LTM CSI report (s) associated with the LTM target cell in the triggered LTM CSI reports.
[0165] In some embodiments, TCI state indicated by the LTM CSC MAC CE. For example, the at least one target LTM CSI report may comprise the configured LTM CSI report (s) associated with the indicated TCI state.
[0166] In some embodiments, the report quantity of LTM CSI report. For example, the report quantity associated with the configured LTM CSI report included in the at least one target CSI report comprises at least one of CRI, RI, PMI, CQI, or LI.
[0167] In some embodiments, a codebook type of LTM CSI report. For example, the codebook type associated with the configured LTM CSI report included in the at least one target CSI report comprises Type-I.
[0168] In some embodiments, CSI AP trigger states selected by MAC CE. For example, the configured LTM CSI report included in the at least one target CSI report is associated with a selected CSI AP trigger state, which is selected by the MAC CE (e.g., Aperiodic CSI Trigger State Subselection MAC CE) .
[0169] According to the above processes, for cell switch triggered by the LTM CSC MAC CE, UE may know how to determine whether reporting CSI for the candidate cell (i.e., target cell) is needed.
[0170] In the following, example procedures how to determine the priority of the CSI report will be discussed.
[0171] According to Rel-18 specification, a CSI report configured with LTM-CSI-ReportConfig has a higher priority over all CSI report (s) configured with CSI-ReportConfig irrespective of PriiCSI(y, k, c, s) value in case of collision with CSI report (s) configured with CSI-ReportConfig. It can be seen that an LTM CSI report may have a higher priority over all non-LTM CSI reports, which means that, in Rel-19, the LTM CSI report for CSI acquisition has a higher priority over the non-LTM CSI report for beam management (BM) . However, in general, at least for non-LTM CSI report, considering that the CSI report for BM is more important for ensuring real-time communication quality, enhancements on the current priority rule may be considered.
[0172] According to some example embodiments of the present disclosure, a new priority rule for LTM CSI report for CSI acquisition and non-LTM CSI report for BM may be defined to ensure real-time communication quality between UE and serving cell.
[0173] Specifically, the (non-LTM) CSI report for BM (e.g., CSI report carrying L1-RSRP or L1-SINR) may have a higher priority over the LTM CSI report for CSI acquisition (e.g., LTM CSI report not carrying L1-RSRP or L1-SINR) .
[0174] In some example embodiments, a CSI report except for CSI report not carrying L1-RSRP or L1-SINR configured with LTM-CSI-ReportConfig has a higher priority over all CSI report (s) configured with CSI-ReportConfig irrespective of PriiCSI(y, k, c, s) value in case of collision with CSI report (s) configured with CSI-ReportConfig.
[0175] In some example embodiments, a CSI report carrying L1-RSRP or L1-SINR configured with LTM-CSI-ReportConfig has a higher priority over all CSI report (s) configured with CSI-ReportConfig irrespective of PriiCSI(y, k, c, s) value in case of collision with CSI report (s) configured with CSI-ReportConfig.
[0176] In some example embodiments, a CSI report carrying L1-RSRP or L1-SINR configured with CSI-ReportConfig has a higher priority over a CSI report not carrying L1-RSRP or L1-SINR configured with LTM-CSI-ReportConfig irrespective of PriiCSI(y, k, c, s) value in case of collision with CSI report (s) configured with CSI- ReportConfig.
[0177] In operation, the network device 120-1 which is serving the terminal device 110 (providing the servicing cell to the terminal device 110) transmits (410-1) an LTM-related configuration indicating at least one first cell 130 to be measured, and the terminal device 110 receives (410-2) the LTM-related configuration accordingly.
[0178] The terminal device 110 may determine a first CSI report for a first cell 130 of the at least one first cell 130, wherein the first CSI report carries at least one of the following: CRI, RI, PMI, CQI or LI, and wherein a first priority of the first CSI report is lower than a second priority of a second CSI report which carries L1-RSRP and / or L1-SINR.
[0179] According to some example embodiments of the present disclosure, for such as the above options B, C, D, E, F the priority rule of the CSI reporting triggered by LTM CSC MAC CE may follow the priority rule of AP CSI report. In other words, the priority rule of the CSI report triggered by the LTM CSC command, e.g., Option B / C / D / E / F, is the same as that of the AP LTM CSI report (i.e., AP CSI report configured with LTM-CSI-ReportConfig) .
[0180] In operation, the network device 120-1 which is serving the terminal device 110 (providing the servicing cell to the terminal device 110) transmits (410-1) an LTM-related configuration indicating at least one first cell 130 to be measured, and the terminal device 110 receives (410-2) the LTM-related configuration accordingly.
[0181] Then the terminal device 110 receives a cell switch command indicating a first cell 130 of the at least one first cell 130 from the network device 120. Then, the terminal device 110 may determine a priority of a CSI report for the first cell 130 according to an approach defined for determining a priority of an aperiodic CSI report, where the CSI report carries at least one of the following: CRI, RI, PMI, CQI or LI.
[0182] In this way, UE / NW knows how to handle the priority rule of the CSI reporting triggered by LTM CSC MAC CE.
[0183] In some cases, different LTM CSI reports for different candidate cells may conflict. especially for LTM CSI report for CSI acquisition, the CSI for high-quality candidate cell may be more valuable, and / or the CSI obtained later may be more valuable. Therefore, new priority rules may be considered. According to some example embodiments of the present disclosure, a priority of LTM CSI report may be associated with candidate cell (beam) quality and / or time domain information related to the LTM CSI report.
[0184] According to some example embodiments of the present disclosure, the priority rule related to (or priority value associated with) the LTM CSI report (mainly for CSI acquisition) may be determined based on at least one of the following: candidate cell associated with the best beam (e.g., the CSI-RS / SSB having the largest L1-RSRP or / and L1-SINR) reported by UE in its most recent report; the best candidate cell (e.g., the candidate cell having the largest RSRP) reported by UE in its most recent report; candidate cell has most recently experienced TCI state activation (e.g., activated by Candidate Cell TCI States Activation / Deactivation MAC CE) ; Time domain location (e.g., slot, symbol, sub-frame, frame) of the latest (or last) CSI-RS associated with the LTM CSI report; and / or Time domain location of the CSI reference resource associated with the LTM CSI report.
[0185] In some embodiments, the LTM CSI report associated with the candidate cell having the best beam quality or the best candidate cell has a higher priority over the other LTM CSI report (s) . For another example, if the time domain location of the latest CSI-RS associated with the LTM CSI repot 1 is later than that of the latest CSI-RS associated with the LTM CSI repot 2, the LTM CSI report 1 has a higher priority than the LTM CSI report 2.
[0186] In operation, the network device 120-1 which is serving the terminal device 110 (providing the servicing cell to the terminal device 110) transmits (410-1) an LTM-related configuration indicating at least one first cell 130 to be measured, and the terminal device 110 receives (410-2) the LTM-related configuration accordingly. The terminal device 110 may determine a priority of a CSI report for a first cell based on at least one of the following: a measurement result of the first cell, at least one transmission configuration indicator (TCI) state activated for the first cell, a time domain location of a latest CSI-reference signal (CSI-RS) resource associated with the CSI report, or a time domain location of the CSI reference resource associated with the CSI report.
[0187] In some embodiments, the CSI report may carry at least one of the following: CRI, RI, PMI, CQI or LI.
[0188] In this way, when multiple LTM CSI reports are collide, more valuable LTM CSI report (s) can be sent to NW.
[0189] According to current specification as follows, for AP CSI report, the CPU (s) are occupied starts from the first symbol after the PDCCH triggering the CSI report. However, for Option A, if UE does not receive the LTM CSC MAC CE correctly, CSI measurement and / or CSI reporting for candidate cell is not needed. In this case, the occupied CPU (s) may be unnecessary. Therefore, new CSI processing timeline may be specified. Additionally, for CSI reporting triggered by the LTM CSC MAC CE, e.g., Option B / C / D / E / F, the CSI processing timeline may be specified.
[0190] For a CSI report with CSI-ReportConfig with higher layer parameter reportQuantity not set to 'none', or a CSI report with LTM-CSI-ReportConfig, the CPU (s) are occupied for a number of OFDM symbols as follows: an aperiodic CSI report occupies CPU (s) from the first symbol after the PDCCH triggering the CSI report until the last symbol of the scheduled PUSCH carrying the report. When the PDCCH reception includes two PDCCH candidates from two respective search space sets, for the purpose of determining the CPU occupation duration, the PDCCH candidate that ends later in time is used.
[0191] According to some example embodiments of the present disclosure, for AP CSI report, the CPU (s) are occupied starts from the time domain location of the PUCCH (or PUSCH) with HARQ-ACK information corresponding to the PDSCH carrying the LTM CSC MAC CE.
[0192] Example embodiments about how the CSI report occupies the CPU are discussed. For an AP LTM CSI report, optionally, in some embodiments, if the LTM CSI report is triggered for reporting CSI for the candidate cell indicated by a LTM CSC MAC CE, the CPU(s) are occupied for a number of OFDM symbols as follows: from the first symbol after the PUCCH (or PUSCH) carrying the HARQ-ACK information corresponding to the PDSCH carrying the LTM CSC MAC CE until the last symbol of the scheduled PUSCH carrying the LTM CSI report. ; Optionally, from the first symbol after a predefined time duration after the PUCCH (or PUSCH) carrying the HARQ-ACK information corresponding to the PDSCH carrying the LTM CSC MAC CE until the last symbol of the scheduled PUSCH carrying the LTM CSI report. Where the predefined time duration may be determined based on at least one of the following: TLTM-RRC-process, TLTM-process, Tfirst-RS, TRS-proc, 3 ms; Optionally, from the timing for successful completion of LTM cell switch until the last symbol of the scheduled PUSCH carrying the LTM CSI report.
[0193] In some embodiments, the network device 120-1 which is serving the terminal device 110 (providing the servicing cell to the terminal device 110) transmits (410-1) an LTM-related configuration indicating at least one first cell 130 to be measured, and the terminal device 110 receives (410-2) the LTM-related configuration accordingly. Then, the terminal device 110 may receive the cell switch command indicating a first cell 130 of the at least one first cell 130 from the network device 120-1. After that, the terminal device may transmit a CSI report for the first cell 130, wherein the CSI report occupies at least one CPU from one of the following: a first symbol after transmitting a PUCCH or PUSCH with HARQ-related information corresponding to a PDSCH carrying the cell switch command, or a first symbol after a pre-defined time duration after transmitting the PUCCH or PUSCH. In some embodiments, the CSI report may carry at least one of the following: CRI, RI, PMI, CQI or LI.
[0194] Optionally, in some embodiments, the terminal device 110 may perform a CSI measurement and / or reporting associated with the CSI report in accordance with a determination that the cell switch command is received correctly.
[0195] Specifically, in some embodiments, for an AP LTM CSI report (for CSI acquisition for candidate cell) triggered by the DCI, UE will only perform CSI measurement and / or CSI reporting when UE receives the LTM CSC MAC CE (scheduled by the DCI) correctly. In other words, the triggered AP LTM CSI report is valid when UE receives the LTM CSC MAC CE correctly. Optionally, the triggered AP LTM CSI report is valid when the LTM cell switch successfully completed.
[0196] Example Methods
[0197] FIG. 5 illustrates a flowchart of a communication method 500 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 500 will be described from the perspective of the terminal device 110 in FIG. 1.
[0198] At block 510, the terminal device receives, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured.
[0199] At block 520, the terminal device receives, from the network device, a cell switch command indicating a first cell of the at least one first cell.
[0200] At block 530, the terminal device determines channel state information (CSI) -related information of the first cell based on at least one of the following: the first cell indicated by the cell switch command, a transmission configuration indicator (TCI) state indicated by the cell switch command, a report quantity of a first CSI report configuration associated with the first cell, a codebook type of the first CSI report configuration, or a CSI trigger state indicated selected by a control command.
[0201] At block 540, the terminal device generates a CSI report based on the CSI-related information, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0202] In some example embodiments, the CSI-related information comprises the first CSI report configuration, and the terminal device is further caused to: receive, from the network device, a CSI trigger state via at least one of the following: the cell switch command, downlink control information transmitted prior to the cell switch command, or downlink control information which schedules a physical downlink shared channel (PDSCH) carrying the cell switch command, wherein the CSI trigger state is associated with a set of CSI report configurations comprising the first CSI report configuration.
[0203] In some example embodiments, the terminal device may determine the first CSI report configuration from the set of CSI report configurations based on the first cell indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the first cell.
[0204] In some example embodiments, the terminal device may determine the first CSI report configuration from the set of CSI report configurations based on the TCI state indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one of the following: at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set which is the same as at least one quasi co-location (QCL) RS associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one further QCL RS associated with the TCI state indicated by the cell switch command, or at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one further QCL RS of at least one further QCL RS associated with the TCI state indicated by the cell switch command.
[0205] In some example embodiments, the CSI-related information comprises a first CSI- reference signal (CSI-RS) resource, and the cell switch command indicates at least one of the following: a first CSI report configuration associated with a set of CSI-RS resources comprising the first CSI-RS resource, or a CSI trigger state associated with the first CSI report configuration, or the CSI-related information comprises a first CSI-RS resource set, and the cell switch command indicates at least one of the following: a first CSI report configuration associated with a set of CSI-RS resource sets comprising the first CSI-RS resource set, or a CSI trigger state associated with the first CSI report configuration.
[0206] In some example embodiments, the terminal device may determine the first CSI-RS resource from the set of CSI-RS resources based on the first cell indicated by the cell switch command, wherein the first CSI-RS resource is associated with the first cell, or determine the first CSI-RS resource set from the set of CSI-RS resource sets based on the first cell indicated by the cell switch command, wherein the first CSI-RS resource set is associated with the first cell.
[0207] In some example embodiments, the terminal device may determine the first CSI-RS resource from the set of CSI-RS resources based on the TCI state indicated by the cell switch command, wherein the first CSI-RS resource is one of the following: a CSI-RS resource associated with the TCI state indicated by the cell switch command, a CSI-RS resource which is the same as at least one quasi co-location (QCL) RS associated with the TCI state indicated by the cell switch command, a CSI-RS resource associated with at least one QCL RS, wherein the at least one QCL RS is the same as at least one further QCL RS associated with the TCI state indicated by the cell switch command, or a CSI-RS resource associated with at least one QCL RS, wherein at least one QCL RS of the at least one QCL RS is the same as at least one further QCL RS of at least one further QCL RS associated with the TCI state indicated by the cell switch command.
[0208] In some example embodiments, the terminal device may receive, from the network device, an indication indicating the terminal device to transmit the CSI report for the first cell, wherein the indication is comprised in the cell switch command or the LTM-related configuration.
[0209] In some example embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and the terminal device may determine the first CSI report configuration from the set of CSI report configurations based on the first cell indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the first cell.
[0210] In some example embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and the terminal device may determine the first CSI report configuration from the set of CSI report configurations based on the TCI state indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one of the following: at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set which is the same as at least one Quasi Co-Location (QCL) RS associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one QCL RS associated with the TCI state indicated by the cell switch command, or at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one QCL RS of at least one QCL RS associated with the TCI state indicated by the cell switch command.
[0211] In some example embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and the terminal device may determine the first CSI report configuration from the set of CSI report configurations, wherein a report quantity of the first CSI report configuration comprises at least one of the following: CRI, RI, PMI, CQI or LI.
[0212] In some example embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and the terminal device may determine the first CSI report configuration from the set of CSI report configurations, wherein a codebook type of the first CSI report configuration at least comprises Type-1.
[0213] In some example embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises a first CSI report configuration, and the terminal device may determine the first CSI report configuration from the set of CSI report configurations, wherein the first report configuration is associated with the CSI trigger state selected by a control command.
[0214] FIG. 6 illustrates a flowchart of a communication method 600 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 600 will be described from the perspective of the terminal device 110 in FIG. 1.
[0215] At block 610, the terminal device receives, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured.
[0216] At block 620, the terminal device determines a first CSI report for a first cell of the at least one first cell, wherein the first CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) , and wherein a first priority of the first CSI report is lower than a second priority of a second CSI report which carries layer 1 reference signal received power (L1-RSRP) and / or layer 1 signal to interference plus noise ratio (L1-SINR) .
[0217] FIG. 7 illustrates a flowchart of a communication method 700 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 700 will be described from the perspective of the terminal device 110 in FIG. 1.
[0218] At block 710, the terminal device receives, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured.
[0219] At block 720, the terminal device receives, from the network device, a cell switch command indicating a first cell of the at least one first cell.
[0220] At block 730, the terminal device determines a priority of a CSI report for the first cell according to an approach defined for determining a priority of an aperiodic CSI report, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0221] FIG. 8 illustrates a flowchart of a communication method 800 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 800 will be described from the perspective of the terminal device 110 in FIG. 1.
[0222] At block 810, the terminal device receives, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured.
[0223] At block 820, the terminal device determines a priority of a channel state information (CSI) report for a first cell based on at least one of the following: At block 840, at least one transmission configuration indicator (TCI) state activated for the first cell, a time domain location of a latest CSI-reference signal (CSI-RS) resource associated with the CSI report, or a time domain location of the CSI reference resource associated with the CSI report.
[0224] In some example embodiments, the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0225] FIG. 9 illustrates a flowchart of a communication method 900 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 900 will be described from the perspective of the terminal device 110 in FIG. 1.
[0226] At block 910, the terminal device receives, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured.
[0227] At block 920, the terminal device receives, from the network device, a cell switch command indicating a first cell of the at least one first cell.
[0228] At block 930, the terminal device transmits a channel state information (CSI) report for the first cell, wherein the CSI report occupies at least one CSI processing unit (CPU) from one of the following: a first symbol after transmitting a physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) with hybrid automatic repeat request (HARQ) -related information corresponding to a physical downlink shared channel (PDSCH) carrying the cell switch command, or, a first symbol after a pre-defined time duration after transmitting the PUCCH or PUSCH.
[0229] In some example embodiments, the terminal device may perform a CSI measurement and / or reporting associated with the CSI report in accordance with a determination that the cell switch command is received correctly.
[0230] In some example embodiments, the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0231] FIG. 10 illustrates a flowchart of a communication method 1000 implemented at a terminal device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 1000 will be described from the perspective of the terminal device 110 in FIG. 1.
[0232] At block 1010, the terminal device receives, from a network device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured, wherein the network device provides at least one CSI report configuration is configured in a serving cell.
[0233] At block 1020, the terminal device receives, from the network device, a cell switch command indicating a first cell of the at least one first cell.
[0234] At block 1030, the terminal device determines, based on the at least one CSI report configuration configured in the serving cell, at least one CSI report for reporting CSI information of the first cell.
[0235] At block 1040, the terminal device transmits the at least one CSI report to the first cell.
[0236] In some example embodiments, the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0237] FIG. 11 illustrates a flowchart of a communication method 1100 implemented at a network device in accordance with some embodiments of the present disclosure. For the purpose of discussion, the method 1100 will be described from the perspective of the network device 120 in FIG. 1.
[0238] At block 1110, the network device transmits, to a terminal device served by the network device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured.
[0239] At block 1120, the network device transmits, to the terminal device, a cell switch command indicating a first cell of the at least one first cell.
[0240] At block 1130, the network device receives, from the terminal device, a channel state information (CSI) report of the first cell generated by the terminal device based on the CSI-related information of the first cell, the CSI-related information being determined by the terminal device based on at least one of the following: the first cell indicated by the cell switch command, a transmission configuration indicator (TCI) state indicated by the cell switch command, a report quantity of a first CSI report configuration associated with the first cell, a codebook type of the first CSI report configuration, or a CSI trigger state indicated selected by a control command, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0241] In some example embodiments, the CSI-related information comprises the first CSI report configuration, and the network device may transmit, to the terminal device, a CSI trigger state via at least one of the following: the cell switch command, downlink control information transmitted prior to the cell switch command, or downlink control information which schedules a physical downlink shared channel (PDSCH) carrying the cell switch command, wherein the CSI trigger state is associated with a set of CSI report configurations comprising the first CSI report configuration.
[0242] In some example embodiments, the first CSI report configuration is determined from the set of CSI report configurations based on the first cell indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the first cell.
[0243] In some example embodiments, the first CSI report configuration is determined from the set of CSI report configurations based on the TCI state indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one of the following: at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set which is the same as at least one quasi co-location (QCL) RS associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one further QCL RS associated with the TCI state indicated by the cell switch command, or at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one further QCL RS of at least one further QCL RS associated with the TCI state indicated by the cell switch command.
[0244] In some example embodiments, the CSI-related information comprises a first CSI-reference signal (CSI-RS) resource, and the cell switch command indicates at least one of the following: a first CSI report configuration associated with a set of CSI-RS resources comprising the first CSI-RS resource, or a CSI trigger state associated with the first CSI report configuration, or the CSI-related information comprises a first CSI-RS resource set, and the cell switch command indicates at least one of the following: a first CSI report configuration associated with a set of CSI-RS resource sets comprising the first CSI-RS resource set, or a CSI trigger state associated with the first CSI report configuration.
[0245] In some example embodiments, the first CSI-RS resource is associated with the first cell, or the first CSI-RS resource set is determined from the set of CSI-RS resource sets based on the first cell indicated by the cell switch command, wherein the first CSI-RS resource set is associated with the first cell.
[0246] In some example embodiments, the first CSI-RS resource is determined from the set of CSI-RS resources based on the TCI state indicated by the cell switch command, wherein the first CSI-RS resource is one of the following: a CSI-RS resource associated with the TCI state indicated by the cell switch command, a CSI-RS resource which is the same as at least one quasi co-location (QCL) RS associated with the TCI state indicated by the cell switch command, a CSI-RS resource associated with at least one QCL RS, wherein the at least one QCL RS is the same as at least one further QCL RS associated with the TCI state indicated by the cell switch command, or a CSI-RS resource associated with at least one QCL RS, wherein at least one QCL RS of the at least one QCL RS is the same as at least one further QCL RS of at least one further QCL RS associated with the TCI state indicated by the cell switch command.
[0247] In some example embodiments, the network device is further caused to: transmit, to the terminal device, an indication indicating the terminal device to transmit the CSI report for the first cell, wherein the indication is comprised in the cell switch command or the LTM-related configuration.
[0248] In some example embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the first CSI report configuration is determined from the set of CSI report configurations based on the first cell indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the first cell.
[0249] In some example embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the first CSI report configuration is determined from the set of CSI report configurations based on the TCI state indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one of the following: at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set which is the same as at least one Quasi Co-Location (QCL) RS associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one QCL RS associated with the TCI state indicated by the cell switch command, or at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one QCL RS of at least one QCL RS associated with the TCI state indicated by the cell switch command.
[0250] In some example embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the first CSI report configuration is determined from the set of CSI report configurations, wherein a report quantity of the first CSI report configuration comprises at least one of the following: CRI, RI, PMI, CQI or LI.
[0251] In some example embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the first CSI report configuration is determined from the set of CSI report configurations, wherein a codebook type of the first CSI report configuration at least comprises Type-1.
[0252] In some example embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises a first CSI report configuration, and the first CSI report configuration is determined from the set of CSI report configurations, wherein the first report configuration is associated with the CSI trigger state selected by a control command.
[0253] Example Devices and Apparatuses
[0254] FIG. 12 is a simplified block diagram of a device 1200 that is suitable for implementing embodiments of the present disclosure. The device 1200 can be considered as a further example implementation of any of the devices as shown in FIG. 1. Accordingly, the device 1200 can be implemented at or as at least a part of the terminal device 110 or the network device 120.
[0255] As shown, the device 1200 includes a processor 1210, a memory 1220 coupled to the processor 1210, a suitable transceiver 1240 coupled to the processor 1210, and a communication interface coupled to the transceiver 1240. The memory 1220 stores at least a part of a program 1230. The transceiver 1240 may be for bidirectional communications or a unidirectional communication based on requirements. The transceiver 1240 may include at least one of a transmitter 1242 and a receiver 1244. The transmitter 1242 and the receiver 1244 may be functional modules or physical entities. The transceiver 1240 has at least one antenna to facilitate communication, though in practice an Access Node mentioned in this application may have several ones. The communication interface may represent any interface that is necessary for communication with other network elements, such as X2 / Xn interface for bidirectional communications between eNBs / gNBs, S1 / NG interface for communication between a Mobility Management Entity (MME) / Access and Mobility Management Function (AMF) / SGW / UPF and the eNB / gNB, Un interface for communication between the eNB / gNB and a relay node (RN) , or Uu interface for communication between the eNB / gNB and a terminal device.
[0256] The program 1230 is assumed to include program instructions that, when executed by the associated processor 1210, enable the device 1200 to operate in accordance with the embodiments of the present disclosure, as discussed herein with reference to FIGS. 1 to 11. The embodiments herein may be implemented by computer software executable by the processor 1210 of the device 1200, or by hardware, or by a combination of software and hardware. The processor 1210 may be configured to implement various embodiments of the present disclosure. Furthermore, a combination of the processor 1210 and memory 1220 may form processing means 1250 adapted to implement various embodiments of the present disclosure.
[0257] The memory 1220 may be of any type suitable to the local technical network and may be implemented using any suitable data storage technology, such as a non-transitory computer readable storage medium, semiconductor-based memory devices, magnetic memory devices and systems, optical memory devices and systems, fixed memory and removable memory, as non-limiting examples. While only one memory 1220 is shown in the device 1200, there may be several physically distinct memory modules in the device 1200. The processor 1210 may be of any type suitable to the local technical network, and may include one or more of general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples. The device 1200 may have multiple processors, such as an application specific integrated circuit chip that is slaved in time to a clock which synchronizes the main processor.
[0258] According to embodiments of the present disclosure, a terminal device comprising a circuitry is provided. The circuitry is configured to: receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; receive, from the network device, a cell switch command indicating a first cell of the at least one first cell; determine channel state information (CSI) -related information of the first cell based on at least one of the following: the first cell indicated by the cell switch command, a transmission configuration indicator (TCI) state indicated by the cell switch command, a report quantity of a first CSI report configuration associated with the first cell, a codebook type of the first CSI report configuration, or a CSI trigger state indicated selected by a control command; and generate a CSI report based on the CSI-related information, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) . According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device as discussed above.
[0259] According to embodiments of the present disclosure, a terminal device comprising a circuitry is provided. The circuitry is configured to: receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; and determine a first CSI report for a first cell of the at least one first cell, wherein the first CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) , and wherein a first priority of the first CSI report is lower than a second priority of a second CSI report which carries layer 1 reference signal received power (L1-RSRP) and / or layer 1 signal to interference plus noise ratio (L1-SINR) . According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device as discussed above.
[0260] According to embodiments of the present disclosure, a terminal device comprising a circuitry is provided. The circuitry is configured to: receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; receive, from the network device, a cell switch command indicating a first cell of the at least one first cell; and determine a priority of a CSI report for the first cell according to an approach defined for determining a priority of an aperiodic CSI report, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) . According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device as discussed above.
[0261] According to embodiments of the present disclosure, a terminal device comprising a circuitry is provided. The circuitry is configured to: receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; determine a priority of a channel state information (CSI) report for a first cell based on at least one of the following: a measurement result of the first cell, at least one transmission configuration indicator (TCI) state activated for the first cell, a time domain location of a latest CSI-reference signal (CSI-RS) resource associated with the CSI report, or a time domain location of the CSI reference resource associated with the CSI report. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device as discussed above.
[0262] According to embodiments of the present disclosure, a terminal device comprising a circuitry is provided. The circuitry is configured to: receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; receive, from the network device, a cell switch command indicating a first cell of the at least one first cell; and transmit a channel state information (CSI) report for the first cell, wherein the CSI report occupies at least one CSI processing unit (CPU) from one of the following: a first symbol after transmitting a physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) with hybrid automatic repeat request (HARQ) -related information corresponding to a physical downlink shared channel (PDSCH) carrying the cell switch command, or a first symbol after a pre-defined time duration after transmitting the PUCCH or PUSCH. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device as discussed above.
[0263] According to embodiments of the present disclosure, a terminal device comprising a circuitry is provided. The circuitry is configured to: receive, from a network device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured, wherein the network device provides at least one CSI report configuration is configured in a serving cell; receive, from the network device, a cell switch command indicating a first cell of the at least one first cell; and determine, based on the at least one CSI report configuration configured in the serving cell, at least one CSI report for reporting CSI information of the first cell; and transmit the at least one CSI report to the first cell. According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the terminal device as discussed above.
[0264] According to embodiments of the present disclosure, a network device comprising a circuitry is provided. The circuitry is configured to: transmit, to a terminal device served by the network device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; transmit, to the terminal device, a cell switch command indicating a first cell of the at least one first cell; receive, from the terminal device, a channel state information (CSI) report of the first cell generated by the terminal device based on the CSI-related information of the first cell, the CSI-related information being determined by the terminal device based on at least one of the following: the first cell indicated by the cell switch command, a transmission configuration indicator (TCI) state indicated by the cell switch command, a report quantity of a first CSI report configuration associated with the first cell, a codebook type of the first CSI report configuration, or a CSI trigger state indicated selected by a control command, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) . According to embodiments of the present disclosure, the circuitry may be configured to perform any method implemented by the network device as discussed above.
[0265] The term “circuitry” used herein may refer to hardware circuits and / or combinations of hardware circuits and software. For example, the circuitry may be a combination of analog and / or digital hardware circuits with software / firmware. As a further example, the circuitry may be any portions of hardware processors with software including digital signal processor (s) , software, and memory (ies) that work together to cause an apparatus, such as a terminal device or a network device, to perform various functions. In a still further example, the circuitry may be hardware circuits and or processors, such as a microprocessor or a portion of a microprocessor, that requires software / firmware for operation, but the software may not be present when it is not needed for operation. As used herein, the term circuitry also covers an implementation of merely a hardware circuit or processor (s) or a portion of a hardware circuit or processor (s) and its (or their) accompanying software and / or firmware.
[0266] According to embodiments of the present disclosure, a terminal apparatus is provided. The terminal apparatus comprises means for receiving, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; means for receiving, from the network device, a cell switch command indicating a first cell of the at least one first cell; means for determining channel state information (CSI) -related information of the first cell based on at least one of the following: the indicated by the cell switch command, a transmission configuration indicator (TCI) state indicated by the cell switch command, a report quantity of a first CSI report configuration associated with the first cell, a codebook type of the first CSI report configuration, or a CSI trigger state indicated selected by a control command; and means for generating a CSI report based on the CSI-related information, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) . In some embodiments, the first apparatus may comprise means for performing the respective operations of the method 500. In some example embodiments, the first apparatus may further comprise means for performing other operations in some example embodiments of the method 500. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0267] According to embodiments of the present disclosure, a terminal apparatus is provided. The terminal apparatus comprises means for receiving, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; and means for determining a first CSI report for a first cell of the at least one first cell, wherein the first CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) , and wherein a first priority of the first CSI report is lower than a second priority of a second CSI report which carries layer 1 reference signal received power (L1-RSRP) and / or layer 1 signal to interference plus noise ratio (L1-SINR) . In some embodiments, the second apparatus may comprise means for performing the respective operations of the method 600. In some example embodiments, the second apparatus may further comprise means for performing other operations in some example embodiments of the method 600. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0268] According to embodiments of the present disclosure, a terminal apparatus is provided. The terminal apparatus comprises means for receiving, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; means for receiving, from the network device, a cell switch command indicating a first cell of the at least one first cell; and means for determining a priority of a CSI report for the first cell according to an approach defined for determining a priority of an aperiodic CSI report, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) . In some embodiments, the third apparatus may comprise means for performing the respective operations of the method 700. In some example embodiments, the third apparatus may further comprise means for performing other operations in some example embodiments of the method 700. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0269] According to embodiments of the present disclosure, a terminal apparatus is provided. The terminal apparatus comprises means for receiving, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; means for determining a priority of a channel state information (CSI) report for a first cell based on at least one of the following: a measurement result of the first cell, at least one transmission configuration indicator (TCI) state activated for the first cell, a time domain location of a latest CSI-reference signal (CSI-RS) resource associated with the CSI report, or a time domain location of the CSI reference resource associated with the CSI report. In some embodiments, the fourth apparatus may comprise means for performing the respective operations of the method 800. In some example embodiments, the fourth apparatus may further comprise means for performing other operations in some example embodiments of the method 800. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0270] According to embodiments of the present disclosure, a terminal apparatus is provided. The terminal apparatus comprises means for receiving, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; means for receiving, from the network device, a cell switch command indicating a first cell of the at least one first cell; and means for transmitting a channel state information (CSI) report for the first cell, wherein the CSI report occupies at least one CSI processing unit (CPU) from one of the following: a first symbol after transmitting a physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) with hybrid automatic repeat request (HARQ) -related information corresponding to a physical downlink shared channel (PDSCH) carrying the cell switch command, or a first symbol after a pre-defined time duration after transmitting the PUCCH or PUSCH. In some embodiments, the fifth apparatus may comprise means for performing the respective operations of the method 900. In some example embodiments, the fifth apparatus may further comprise means for performing other operations in some example embodiments of the method 900. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0271] According to embodiments of the present disclosure, a terminal apparatus is provided. The terminal apparatus comprises means for receiving, from a network device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured, wherein the network device provides at least one CSI report configuration is configured in a serving cell; means for receiving, from the network device, a cell switch command indicating a first cell of the at least one first cell; and means for determining, based on the at least one CSI report configuration configured in the serving cell, at least one CSI report for reporting CSI information of the first cell; and means for transmitting the at least one CSI report to the first cell. In some embodiments, the sixth apparatus may comprise means for performing the respective operations of the method 1000. In some example embodiments, the sixth apparatus may further comprise means for performing other operations in some example embodiments of the method 1000. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0272] According to embodiments of the present disclosure, a network apparatus is provided. The network apparatus comprises means for transmitting, to a terminal device served by the network device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; means for transmitting, to the terminal device, a cell switch command indicating a first cell of the at least one first cell; means for receiving, from the terminal device, a channel state information (CSI) report of the first cell generated by the terminal device based on the CSI-related information of the first cell, the CSI-related information being determined by the terminal device based on at least one of the following: the indicated by the cell switch command, a transmission configuration indicator (TCI) state indicated by the cell switch command, a report quantity of a first CSI report configuration associated with the first cell, a codebook type of the first CSI report configuration, or a CSI trigger state indicated selected by a control command, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) . In some embodiments, the seventh apparatus may comprise means for performing the respective operations of the method 1100. In some example embodiments, the seventh apparatus may further comprise means for performing other operations in some example embodiments of the method 1100. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module.
[0273] In summary, embodiments of the present disclosure provide the following aspects.
[0274] In an aspect, it is proposed a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; receive, from the network device, a cell switch command indicating a first cell of the at least one first cell; determine channel state information (CSI) -related information of the first cell based on at least one of the following: the first cell indicated by the cell switch command, a transmission configuration indicator (TCI) state indicated by the cell switch command, a report quantity of a first CSI report configuration associated with the first cell, a codebook type of the first CSI report configuration, or a CSI trigger state indicated selected by a control command; and generate a CSI report based on the CSI-related information, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0275] In some embodiments, the CSI-related information comprises the first CSI report configuration, and the terminal device is further caused to: receive, from the network device, a CSI trigger state via at least one of the following: the cell switch command, downlink control information transmitted prior to the cell switch command, or downlink control information which schedules a physical downlink shared channel (PDSCH) carrying the cell switch command, wherein the CSI trigger state is associated with a set of CSI report configurations comprising the first CSI report configuration.
[0276] In some embodiments, the terminal device is further caused to: determine the first CSI report configuration from the set of CSI report configurations based on the first cell indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the first cell.
[0277] In some embodiments, the terminal device is further caused to: determine the first CSI report configuration from the set of CSI report configurations based on the TCI state indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one of the following: at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set which is the same as at least one quasi co-location (QCL) RS associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one further QCL RS associated with the TCI state indicated by the cell switch command, or at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one further QCL RS of at least one further QCL RS associated with the TCI state indicated by the cell switch command.
[0278] In some embodiments, the CSI-related information comprises a first CSI-reference signal (CSI-RS) resource, and the cell switch command indicates at least one of the following: a first CSI report configuration associated with a set of CSI-RS resources comprising the first CSI-RS resource, or a CSI trigger state associated with the first CSI report configuration, or the CSI-related information comprises a first CSI-RS resource set, and the cell switch command indicates at least one of the following: a first CSI report configuration associated with a set of CSI-RS resource sets comprising the first CSI-RS resource set, or a CSI trigger state associated with the first CSI report configuration.
[0279] In some embodiments, the terminal device is further caused to: determine the first CSI-RS resource from the set of CSI-RS resources based on the first cell indicated by the cell switch command, wherein the first CSI-RS resource is associated with the first cell, or determine the first CSI-RS resource set from the set of CSI-RS resource sets based on the first cell indicated by the cell switch command, wherein the first CSI-RS resource set is associated with the first cell.
[0280] In some embodiments, the terminal device is further caused to: determine the first CSI-RS resource from the set of CSI-RS resources based on the TCI state indicated by the cell switch command, wherein the first CSI-RS resource is one of the following: a CSI-RS resource associated with the TCI state indicated by the cell switch command, a CSI-RS resource which is the same as at least one quasi co-location (QCL) RS associated with the TCI state indicated by the cell switch command, a CSI-RS resource associated with at least one QCL RS, wherein the at least one QCL RS is the same as at least one further QCL RS associated with the TCI state indicated by the cell switch command, or a CSI-RS resource associated with at least one QCL RS, wherein at least one QCL RS of the at least one QCL RS is the same as at least one further QCL RS of at least one further QCL RS associated with the TCI state indicated by the cell switch command.
[0281] In some embodiments, the terminal device is further caused to: receive, from the network device, an indication indicating the terminal device to transmit the CSI report for the first cell, wherein the indication is comprised in the cell switch command or the LTM-related configuration.
[0282] In some embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the terminal device is further caused to: determine the first CSI report configuration from the set of CSI report configurations based on the first cell indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the first cell.
[0283] In some embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the terminal device is further caused to: determine the first CSI report configuration from the set of CSI report configurations based on the TCI state indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one of the following: at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set which is the same as at least one Quasi Co-Location (QCL) RS associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one QCL RS associated with the TCI state indicated by the cell switch command, or at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one QCL RS of at least one QCL RS associated with the TCI state indicated by the cell switch command.
[0284] In some embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the terminal device is further caused to: determine the first CSI report configuration from the set of CSI report configurations, wherein a report quantity of the first CSI report configuration comprises at least one of the following: CRI, RI, PMI, CQI or LI.
[0285] In some embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the terminal device is further caused to: determine the first CSI report configuration from the set of CSI report configurations, wherein a codebook type of the first CSI report configuration at least comprises Type-1.
[0286] In some embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises a first CSI report configuration, and the terminal device is further caused to: determine the first CSI report configuration from the set of CSI report configurations, wherein the first report configuration is associated with the CSI trigger state selected by a control command.
[0287] In an aspect, it is proposed a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; and determine a first CSI report for a first cell of the at least one first cell, wherein the first CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) , and wherein a first priority of the first CSI report is lower than a second priority of a second CSI report which carries layer 1 reference signal received power (L1-RSRP) and / or layer 1 signal to interference plus noise ratio (L1-SINR) .
[0288] In an aspect, it is proposed a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; receive, from the network device, a cell switch command indicating a first cell of the at least one first cell; and determine a priority of a CSI report for the first cell according to an approach defined for determining a priority of an aperiodic CSI report, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0289] In an aspect, it is proposed a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; determine a priority of a channel state information (CSI) report for a first cell based on at least one of the following: a measurement result of the first cell, at least one transmission configuration indicator (TCI) state activated for the first cell, a time domain location of a latest CSI-reference signal (CSI-RS) resource associated with the CSI report, or a time domain location of the CSI reference resource associated with the CSI report.
[0290] In some embodiments, the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0291] In an aspect, it is proposed a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; receive, from the network device, a cell switch command indicating a first cell of the at least one first cell; and transmit a channel state information (CSI) report for the first cell, wherein the CSI report occupies at least one CSI processing unit (CPU) from one of the following: a first symbol after transmitting a physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) with hybrid automatic repeat request (HARQ) -related information corresponding to a physical downlink shared channel (PDSCH) carrying the cell switch command, or a first symbol after a pre-defined time duration after transmitting the PUCCH or PUSCH.
[0292] In some embodiments, the terminal device is further caused to: perform a CSI measurement and / or reporting associated with the CSI report in accordance with a determination that the cell switch command is received correctly.
[0293] In some embodiments, the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0294] In an aspect, it is proposed a terminal device comprising: a processor configured to cause the terminal device to: receive, from a network device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured, wherein the network device provides at least one CSI report configuration is configured in a serving cell; receive, from the network device, a cell switch command indicating a first cell of the at least one first cell; and determine, based on the at least one CSI report configuration configured in the serving cell, at least one CSI report for reporting CSI information of the first cell; and transmit the at least one CSI report to the first cell.
[0295] In some embodiments, the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0296] In an aspect, it is proposed a network device comprising: a processor configured to cause the network device to: transmit, to a terminal device served by the network device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; transmit, to the terminal device, a cell switch command indicating a first cell of the at least one first cell; receive, from the terminal device, a channel state information (CSI) report of the first cell generated by the terminal device based on the CSI-related information of the first cell, the CSI-related information being determined by the terminal device based on at least one of the following: the first cell indicated by the cell switch command, a transmission configuration indicator (TCI) state indicated by the cell switch command, a report quantity of a first CSI report configuration associated with the first cell, a codebook type of the first CSI report configuration, or a CSI trigger state indicated selected by a control command, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .
[0297] In some embodiments, the CSI-related information comprises the first CSI report configuration, and the network device is further caused to: transmit, to the terminal device, a CSI trigger state via at least one of the following: the cell switch command, downlink control information transmitted prior to the cell switch command, or downlink control information which schedules a physical downlink shared channel (PDSCH) carrying the cell switch command, wherein the CSI trigger state is associated with a set of CSI report configurations comprising the first CSI report configuration.
[0298] In some embodiments, the first CSI report configuration is determined from the set of CSI report configurations based on the first cell indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the first cell.
[0299] In some embodiments, the first CSI report configuration is determined from the set of CSI report configurations based on the TCI state indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one of the following: at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set which is the same as at least one quasi co-location (QCL) RS associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one further QCL RS associated with the TCI state indicated by the cell switch command, or at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one further QCL RS of at least one further QCL RS associated with the TCI state indicated by the cell switch command.
[0300] In some embodiments, the CSI-related information comprises a first CSI-reference signal (CSI-RS) resource, and the cell switch command indicates at least one of the following: a first CSI report configuration associated with a set of CSI-RS resources comprising the first CSI-RS resource, or a CSI trigger state associated with the first CSI report configuration, or the CSI-related information comprises a first CSI-RS resource set, and the cell switch command indicates at least one of the following: a first CSI report configuration associated with a set of CSI-RS resource sets comprising the first CSI-RS resource set, or a CSI trigger state associated with the first CSI report configuration.
[0301] In some embodiments, the first CSI-RS resource is associated with the first cell, or the first CSI-RS resource set is determined from the set of CSI-RS resource sets based on the first cell indicated by the cell switch command, wherein the first CSI-RS resource set is associated with the first cell.
[0302] In some embodiments, the first CSI-RS resource is determined from the set of CSI-RS resources based on the TCI state indicated by the cell switch command, wherein the first CSI-RS resource is one of the following: a CSI-RS resource associated with the TCI state indicated by the cell switch command, a CSI-RS resource which is the same as at least one quasi co-location (QCL) RS associated with the TCI state indicated by the cell switch command, a CSI-RS resource associated with at least one QCL RS, wherein the at least one QCL RS is the same as at least one further QCL RS associated with the TCI state indicated by the cell switch command, or a CSI-RS resource associated with at least one QCL RS, wherein at least one QCL RS of the at least one QCL RS is the same as at least one further QCL RS of at least one further QCL RS associated with the TCI state indicated by the cell switch command.
[0303] In some embodiments, the network device is further caused to: transmit, to the terminal device, an indication indicating the terminal device to transmit the CSI report for the first cell, wherein the indication is comprised in the cell switch command or the LTM-related configuration.
[0304] In some embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the first CSI report configuration is determined from the set of CSI report configurations based on the first cell indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the first cell.
[0305] In some embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the first CSI report configuration is determined from the set of CSI report configurations based on the TCI state indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one of the following: at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set which is the same as at least one Quasi Co-Location (QCL) RS associated with the TCI state indicated by the cell switch command, at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one QCL RS associated with the TCI state indicated by the cell switch command, or at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one QCL RS of at least one QCL RS associated with the TCI state indicated by the cell switch command.
[0306] In some embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the first CSI report configuration is determined from the set of CSI report configurations, wherein a report quantity of the first CSI report configuration comprises at least one of the following: CRI, RI, PMI, CQI or LI.
[0307] In some embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the first CSI report configuration is determined from the set of CSI report configurations, wherein a codebook type of the first CSI report configuration at least comprises Type-1.
[0308] In some embodiments, the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises a first CSI report configuration, and the first CSI report configuration is determined from the set of CSI report configurations, wherein the first report configuration is associated with the CSI trigger state selected by a control command.
[0309] In an aspect, a terminal device comprises: at least one processor; and at least one memory coupled to the at least one processor and storing instructions thereon, the instructions, when executed by the at least one processor, causing the device to perform the method implemented by the terminal device discussed above.
[0310] In an aspect, a network device comprises: at least one processor; and at least one memory coupled to the at least one processor and storing instructions thereon, the instructions, when executed by the at least one processor, causing the device to perform the method implemented by the network device discussed above.
[0311] In an aspect, a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the terminal device discussed above.
[0312] In an aspect, a computer readable medium having instructions stored thereon, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the network device discussed above.
[0313] In an aspect, a computer program comprising instructions, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the terminal device discussed above.
[0314] In an aspect, a computer program comprising instructions, the instructions, when executed on at least one processor, causing the at least one processor to perform the method implemented by the network device discussed above.
[0315] Generally, various embodiments of the present disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. While various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, it will be appreciated that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.
[0316] The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer readable storage medium. The computer program product includes computer-executable instructions, such as those included in program modules, being executed in a device on a target real or virtual processor, to carry out the process or method as described above with reference to FIGS. 1 to 12. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, or the like that perform particular tasks or implement particular abstract data types. The functionality of the program modules may be combined or split between program modules as desired in various embodiments. Machine-executable instructions for program modules may be executed within a local or distributed device. In a distributed device, program modules may be located in both local and remote storage media.
[0317] Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. These program codes may be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program codes, when executed by the processor or controller, cause the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may execute entirely on a machine, partly on the machine, as a stand-alone software package, partly on the machine and partly on a remote machine or entirely on the remote machine or server.
[0318] The above program code may be embodied on a machine readable medium, which may be any tangible medium that may contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The machine readable medium may be a machine readable signal medium or a machine readable storage medium. A machine readable medium may include but not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the machine readable storage medium would include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM) , a read-only memory (ROM) , an erasable programmable read-only memory (EPROM or Flash memory) , an optical fiber, a portable compact disc read-only memory (CD-ROM) , an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.
[0319] Further, while operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous. Likewise, while several specific implementation details are contained in the above discussions, these should not be construed as limitations on the scope of the present disclosure, but rather as descriptions of features that may be specific to particular embodiments. Certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment may also be implemented in multiple embodiments separately or in any suitable sub-combination.
[0320] Although the present disclosure has been described in language specific to structural features and / or methodological acts, it is to be understood that the present disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.
Claims
1.A terminal device comprising:a processor configured to cause the terminal device to:receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured;receive, from the network device, a cell switch command indicating a first cell of the at least one first cell;determine channel state information (CSI) -related information of the first cell based on at least one of the following:the first cell indicated by the cell switch command,a transmission configuration indicator (TCI) state indicated by the cell switch command,a report quantity of a first CSI report configuration associated with the first cell,a codebook type of the first CSI report configuration, ora CSI trigger state indicated selected by a control command; andgenerate a CSI report based on the CSI-related information, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .2.The terminal device of claim 1, wherein the CSI-related information comprises the first CSI report configuration, and the terminal device is further caused to:receive, from the network device, a CSI trigger state via at least one of the following:the cell switch command,downlink control information transmitted prior to the cell switch command, ordownlink control information which schedules a physical downlink shared channel (PDSCH) carrying the cell switch command,wherein the CSI trigger state is associated with a set of CSI report configurations comprising the first CSI report configuration.3.The terminal device of claim 2, wherein the terminal device is further caused to:determine the first CSI report configuration from the set of CSI report configurations based on the first cell indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the first cell.4.The terminal device of claim 2, wherein the terminal device is further caused to:determine the first CSI report configuration from the set of CSI report configurations based on the TCI state indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one of the following:at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the TCI state indicated by the cell switch command,at least one CSI-RS resource or CSI-RS resource set which is the same as at least one quasi co-location (QCL) RS associated with the TCI state indicated by the cell switch command,at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one further QCL RS associated with the TCI state indicated by the cell switch command, orat least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one further QCL RS of at least one further QCL RS associated with the TCI state indicated by the cell switch command.5.The terminal device of claim 1, wherein,the CSI-related information comprises a first CSI-reference signal (CSI-RS) resource, and the cell switch command indicates at least one of the following: a first CSI report configuration associated with a set of CSI-RS resources comprising the first CSI-RS resource, or a CSI trigger state associated with the first CSI report configuration, orthe CSI-related information comprises a first CSI-RS resource set, and the cell switch command indicates at least one of the following: a first CSI report configuration associated with a set of CSI-RS resource sets comprising the first CSI-RS resource set, or a CSI trigger state associated with the first CSI report configuration.6.The terminal device of claim 5, wherein the terminal device is further caused to:determine the first CSI-RS resource from the set of CSI-RS resources based on the first cell indicated by the cell switch command, wherein the first CSI-RS resource is associated with the first cell, ordetermine the first CSI-RS resource set from the set of CSI-RS resource sets based on the first cell indicated by the cell switch command, wherein the first CSI-RS resource set is associated with the first cell.7.The terminal device of claim 5, wherein the terminal device is further caused to:determine the first CSI-RS resource from the set of CSI-RS resources based on the TCI state indicated by the cell switch command, wherein the first CSI-RS resource is one of the following:a CSI-RS resource associated with the TCI state indicated by the cell switch command,a CSI-RS resource which is the same as at least one quasi co-location (QCL) RS associated with the TCI state indicated by the cell switch command,a CSI-RS resource associated with at least one QCL RS, wherein the at least one QCL RS is the same as at least one further QCL RS associated with the TCI state indicated by the cell switch command, ora CSI-RS resource associated with at least one QCL RS, wherein at least one QCL RS of the at least one QCL RS is the same as at least one further QCL RS of at least one further QCL RS associated with the TCI state indicated by the cell switch command.8.The terminal device of claim 1, wherein the terminal device is further caused to:receive, from the network device, an indication indicating the terminal device to transmit the CSI report for the first cell, wherein the indication is comprised in the cell switch command or the LTM-related configuration.9.The terminal device of claim 8, wherein the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the terminal device is further caused to:determine the first CSI report configuration from the set of CSI report configurations based on the first cell indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the first cell.10.The terminal device of claim 8, wherein the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the terminal device is further caused to:determine the first CSI report configuration from the set of CSI report configurations based on the TCI state indicated by the cell switch command, wherein the first CSI report configuration is associated with at least one of the following:at least one CSI-reference signal (CSI-RS) resource or CSI-RS resource set associated with the TCI state indicated by the cell switch command,at least one CSI-RS resource or CSI-RS resource set which is the same as at least one Quasi Co-Location (QCL) RS associated with the TCI state indicated by the cell switch command,at least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one QCL RS associated with the TCI state indicated by the cell switch command, orat least one CSI-RS resource or CSI-RS resource set, wherein at least one QCL RS of the at least one CSI-RS resource or CSI-RS resource set is the same as at least one QCL RS of at least one QCL RS associated with the TCI state indicated by the cell switch command.11.The terminal device of claim 8, wherein the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the terminal device is further caused to:determine the first CSI report configuration from the set of CSI report configurations, wherein a report quantity of the first CSI report configuration comprises at least one of the following: CRI, RI, PMI, CQI or LI.12.The terminal device of claim 8, wherein the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises the first CSI report configuration, and wherein the terminal device is further caused to:determine the first CSI report configuration from the set of CSI report configurations, wherein a codebook type of the first CSI report configuration at least comprises Type-1.13.The terminal device of claim 8, wherein the terminal device is configured with a set of CSI report configurations and the CSI-related information comprises a first CSI report configuration, and the terminal device is further caused to:determine the first CSI report configuration from the set of CSI report configurations, wherein the first report configuration is associated with the CSI trigger state selected by a control command.14.A terminal device comprising:a processor configured to cause the terminal device to:receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured; anddetermine a first CSI report for a first cell of the at least one first cell, wherein the first CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) , and wherein a first priority of the first CSI report is lower than a second priority of a second CSI report which carries layer 1 reference signal received power (L1-RSRP) and / or layer 1 signal to interference plus noise ratio (L1-SINR) .15.A terminal device comprising:a processor configured to cause the terminal device to:receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured;receive, from the network device, a cell switch command indicating a first cell of the at least one first cell; anddetermine a priority of a CSI report for the first cell according to an approach defined for determining a priority of an aperiodic CSI report, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .16.A terminal device comprising:a processor configured to cause the terminal device to:receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured;determine a priority of a channel state information (CSI) report for a first cell based on at least one of the following:a measurement result of the first cell,at least one transmission configuration indicator (TCI) state activated for the first cell,a time domain location of a latest CSI-reference signal (CSI-RS) resource associated with the CSI report, ora time domain location of the CSI reference resource associated with the CSI report.17.The terminal device of claim 16, wherein the CSI report carries at least one of the following: CSI-reference signal (CSI-RS) resource indicator (CRI) , rank indicator (RI) , precoding matrix indicator (PMI) , channel quality indicator (CQI) or layer indicator (LI) .18.A terminal device comprising:a processor configured to cause the terminal device to:receive, from a network device serving the terminal device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured;receive, from the network device, a cell switch command indicating a first cell of the at least one first cell; andtransmit a channel state information (CSI) report for the first cell, wherein the CSI report occupies at least one CSI processing unit (CPU) from one of the following:a first symbol after transmitting a physical uplink control channel (PUCCH) or physical uplink shared channel (PUSCH) with hybrid automatic repeat request (HARQ) -related information corresponding to a physical downlink shared channel (PDSCH) carrying the cell switch command, ora first symbol after a pre-defined time duration after transmitting the PUCCH or PUSCH.19.The terminal device of claim 18, wherein the terminal device is further caused to:perform a CSI measurement and / or reporting associated with the CSI report in accordance with a determination that the cell switch command is received correctly.20.A terminal device comprising:a processor configured to cause the terminal device to:receive, from a network device, a layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) -related configuration indicating at least one first cell to be measured, wherein the network device provides at least one CSI report configuration is configured in a serving cell;receive, from the network device, a cell switch command indicating a first cell of the at least one first cell; anddetermine, based on the at least one CSI report configuration configured in the serving cell, at least one CSI report for reporting CSI information of the first cell; andtransmit the at least one CSI report to the first cell.