Early channel state information acquisition

Abstract

Example embodiments of the present disclosure are directed to an early channel state information acquisition procedure. A method comprises: receiving, from a second apparatus providing a first cell serving the first apparatus, a mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition; determining, based at least on CPU occupancy in the first cell and the mobility configuration, CSI-related information of at least one candidate cell of the plurality of candidate cells, the at least one candidate cell comprising a second cell; receiving, from the second apparatus, a cell switch command indicating the second cell; and transmitting, to a third apparatus providing the second cell, a measurement report comprising CSI-related information of the second cell.

Description

EARLY CHANNEL STATE INFORMATION ACQUISITIONFIELD

[0001] Various example embodiments of the present disclosure generally relate to the field of telecommunication and in particular, to methods, devices, apparatuses and computer readable storage medium for early channel state information acquisition.BACKGROUND

[0002] With the continuous development of mobile networks, managing and optimizing user mobility between different network nodes has become crucial. Modern mobile communication systems require seamless connectivity between various network nodes to ensure efficient and reliable handovers. 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. Further, technology of layer 1 / layer 2 (L1 / L2) triggered mobility (LTM) may be used for enabling the cell switch. LTM is a procedure in which the next generation node B (gNB) receives LI and / or layer 3 (L3) measurement report(s) from a UE, and thus the gNB changes user equipment (UE) serving cell by a cell switch command signalled via a medium access control (MAC) control element (CE).SUMMARY

[0003] In a first aspect of the present disclosure, there is provided a first apparatus. The first apparatus comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the first apparatus to: receive, from a second apparatus providing a first cell serving the first apparatus, a mobility configuration indicating a plurality of candidate cells and a plurality of reference signal (RS) resources for at least one candidate cell of the plurality of candidate cells for channel state information (CSI)-related information acquisition; determine, based at least on CSI processing unit (CPU) occupancy in the first cell and the mobility configuration, CSI-related information of at least one candidate cell of the plurality of candidate cells, the at least one candidate cell comprising a second cell; receive, from the second apparatus, a cell switch command indicating the second cell; and transmit, to a third apparatusproviding the second cell, a measurement report comprising CSI-related information of the second cell.

[0004] In a second aspect of the present disclosure, there is provided a second apparatus. The second apparatus comprises at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the second apparatus to: receive, from a first apparatus, capability-related information indicating at least one of: that the first apparatus supports CSI calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving the cell switch command, or a first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus, transmit, based on the capability-related information, a mobility configuration to the first apparatus, the mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition; receive, from the first apparatus, measurement results of the plurality of candidate cells; and transmit, based on the measurement results, a cell switch command indicating a second cell from the plurality of candidate cells.

[0005] In a third aspect of the present disclosure, there is provided a method. The method comprises: receiving, from a second apparatus providing a first cell serving the first apparatus, a mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition; determining, based at least on CPU occupancy in the first cell and the mobility configuration, CSI-related information of at least one candidate cell of the plurality of candidate cells, the at least one candidate cell comprising a second cell; receiving, from the second apparatus, a cell switch command indicating the second cell; and transmitting, to a third apparatus providing the second cell, a measurement report comprising CSI-related information of the second cell.

[0006] In a fourth aspect of the present disclosure, there is provided a method. The method comprises: receiving, from a first apparatus, capability-related information indicating at least one of: that the first apparatus supports CSI calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving the cell switch command, or a first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus.transmitting, based on the capability-related information, a mobility configuration to the first apparatus, the mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition; receiving, from the first apparatus, measurement results of the plurality of candidate cells; and transmitting, based on the measurement results, a cell switch command indicating a second cell from the plurality of candidate cells.

[0007] In a fifth aspect of the present disclosure, there is provided a first apparatus. The first apparatus comprises means for receiving, from a second apparatus providing a first cell serving the first apparatus, a mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition; means for determining, based at least on CPU occupancy in the first cell and the mobility configuration, CSI-related information of at least one candidate cell of the plurality of candidate cells, the at least one candidate cell comprising a second cell; means for receiving, from the second apparatus, a cell switch command indicating the second cell; and means for transmitting, to a third apparatus providing the second cell, a measurement report comprising CSI-related information of the second cell.

[0008] In a sixth aspect of the present disclosure, there is provided a second apparatus. The second apparatus comprises means for receiving, from a first apparatus, capability-related information indicating at least one of that the first apparatus supports CSI calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving the cell switch command, or a first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus, means for transmitting, based on the capability-related information, a mobility configuration to the first apparatus, the mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition; means for receiving, from the first apparatus, measurement results of the plurality of candidate cells; and means for transmitting, based on the measurement results, a cell switch command indicating a second cell from the plurality of candidate cells.

[0009] In a seventh aspect of the present disclosure, there is provided a computerreadable medium. The computer readable medium comprises instructions stored thereon for causing an apparatus to perform at least the method according to the third aspect.

[0010] In an eighth aspect of the present disclosure, there is provided a computer readable medium. The computer readable medium comprises instructions stored thereon for causing an apparatus to perform at least the method according to the fourth aspect.

[0011] It is to be understood that the Summary section is not intended to identify key or essential features of embodiments of the present disclosure, nor is it intended to be used to limit the scope of the present disclosure. Other features of the present disclosure will become easily comprehensible through the following description.BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Some example embodiments will now be described with reference to the accompanying drawings, where:

[0013] FIG. 1 illustrates a signaling flow for an overall procedure for LTM;

[0014] FIG. 2A and FIG. 2B illustrate example communication environments in which example embodiments of the present disclosure can be implemented, respectively;

[0015] FIG. 3A and FIG. 3C illustrate procedures for CSI acquisition before / during LTM cell switch;

[0016] FIG. 4 to FIG. 6 illustrate example signaling flows for communication in accordance with some example embodiments of the present disclosure;

[0017] FIG. 7A to FIG. 7C illustrate example signaling flows for communication in accordance with some example embodiments of the present disclosure;

[0018] FIG. 8A and FIG. 8B illustrate examples of CPU occupancy for CSI acquisition in accordance with some example embodiments of the present disclosure;

[0019] FIG. 9 illustrates a flowchart of a method implemented at a first apparatus in accordance with some example embodiments of the present disclosure;

[0020] FIG. 10 illustrates a flowchart of a method implemented at a second apparatus in accordance with some example embodiments of the present disclosure;

[0021] FIG. 11 illustrates a flowchart of a method implemented at a first apparatus inaccordance with some example embodiments of the present disclosure;

[0022] FIG. 12 illustrates a flowchart of a method implemented at a second apparatus in accordance with some example embodiments of the present disclosure;

[0023] FIG.13 illustrates a flowchart of a method implemented at a first apparatus in accordance with some example embodiments of the present disclosure;

[0024] FIG. 14 illustrates a flowchart of a method implemented at a second apparatus in accordance with some example embodiments of the present disclosure;

[0025] FIG. 15 illustrates a simplified block diagram of a device that is suitable for implementing example embodiments of the present disclosure; and

[0026] FIG. 16 illustrates a block diagram of an example computer readable medium in accordance with some example embodiments of the present disclosure.

[0027] Throughout the drawings, the same or similar reference numerals represent the same or similar element.DETAILED DESCRIPTION

[0028] 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.

[0029] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same mean as commonly understood by one of ordinary skills in the art to which this disclosure belongs.

[0030] References in the present disclosure to “one embodiment,” “an embodiment,” “an example embodiment,” and the like indicate that the embodiment described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it issubmitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

[0031] It shall be understood that although the terms “first,” “second,”..., etc. in front of noun(s) and the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another and they do not limit the order of the noun(s). For example, a first element could be termed a second element, and similarly, a second element could be termed a first element, without departing from the scope of example embodiments. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms.

[0032] As used herein, “at least one of the following: ” and “at least one of ” and similar wording, where the list of two or more elements are joined by “and” or “or”, mean at least any one of the elements, or at least any two or more of the elements, or at least all the elements.

[0033] As used herein, unless stated explicitly, performing a step “in response to A” does not indicate that the step is performed immediately after “A” occurs and one or more intervening steps may be included.

[0034] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises”, “comprising”, “has”, “having”, “includes” and / or “including”, when used herein, specify the presence of stated features, elements, and / or components etc., but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof.

[0035] As used in this application, the term “circuitry” may refer to one or more or all of the following:(a) hardware-only circuit implementations (such as implementations in only analog and / or digital circuitry) and(b) combinations of hardware circuits and software, such as (as applicable):(i) a combination of analog and / or digital hardware circuit(s) with software / firmware and(ii) any portions of hardware processor(s) with software (including digital signal processor(s)), software, and memory(ies) that work together to cause an apparatus, such as a mobile phone or server, to perform various functions) and(c) hardware circuit(s) and or processor(s), such as a microprocessor(s) or a portion of a microprocessor(s), that requires software (e.g., firmware) for operation, but the software may not be present when it is not needed for operation.

[0036] This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or multiple processors) or portion of a hardware circuit or processor and its (or their) accompanying software and / or firmware. The term circuitry also covers, for example and if applicable to the particular claim element, a baseband integrated circuit or processor integrated circuit for a mobile device or a similar integrated circuit in server, a cellular network device, or other computing or network device.

[0037] As used herein, the term “communication network” refers to a network following any suitable communication standards, such as New Radio (NR), Long Term Evolution (LTE), LTE-Advanced (LTE-A), Wideband Code Division Multiple Access (WCDMA), High-Speed Packet Access (HSPA), Narrow Band Internet of Things (NB-IoT) and so on. Furthermore, the communications between a terminal device and a network device in the communication network may be performed according to any suitable generation communication protocols, including, 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), 5.5G, the sixth generation (6G) communication protocols, and / or any other protocols either currently known or to be developed in the future. Embodiments of the present disclosure may be applied in various communication systems. Given the rapid development in communications, there will of course also be future type communication technologies and systems with which the present disclosure may be embodied. It should not be seen as limiting the scope of the present disclosure to only the aforementioned system.

[0038] As used herein, the term “network device” refers to a node in a communication network via which a terminal device accesses the network and receives services therefrom. The network device may refer to a base station (BS) or an access point (AP), for example, a node B (NodeB or NB), an evolved NodeB (eNodeB or eNB), an NR NB (also referred to as a gNB), a Remote Radio Unit (RRU), a radio header (RH), a remote radio head (RRH), a relay, an Integrated Access and Backhaul (IAB) node, a low power node such as a femto, a pico, a non-terrestrial network (NTN) or non-ground network device such as a satellite network device, a low earth orbit (LEO) satellite and a geosynchronous earth orbit (GEO) satellite, an aircraft network device, and so forth, depending on the applied terminology and technology. In some example embodiments, radio access network (RAN) split architecture comprises a Centralized Unit (CU) and a Distributed Unit (DU) at an IAB donor node. An IAB node comprises a Mobile Terminal (IAB-MT) part that behaves like a UE toward the parent node, and a DU part of an IAB node behaves like a base station toward the next-hop IAB node.

[0039] The term “terminal device” refers to any end device that may be capable of wireless communication. By way of example rather than limitation, a terminal device may also be referred to as a communication device, user equipment (UE), a Subscriber Station (SS), a Portable Subscriber Station, a Mobile Station (MS), or an Access Terminal (AT). The terminal device may include, but not limited to, a mobile phone, a cellular phone, a smart phone, voice over IP (VoIP) phones, wireless local loop phones, a tablet, a wearable terminal device, a personal digital assistant (PDA), portable computers, desktop computer, image capture terminal devices such as digital cameras, gaming terminal devices, music storage and playback appliances, vehicle-mounted wireless terminal devices, wireless endpoints, mobile stations, laptop-embedded equipment (LEE), laptop -mounted equipment (LME), USB dongles, smart devices, wireless customer-premises equipment (CPE), an Internet of Things (loT) device, a watch or other wearable, a head-mounted display (HMD), a vehicle, a drone, a medical device and applications (e.g., remote surgery), an industrial device and applications (e.g., a robot and / or other wireless devices operating in an industrial and / or an automated processing chain contexts), a consumer electronics device, a device operating on commercial and / or industrial wireless networks, and the like. The terminal device may also correspond to a Mobile Termination (MT) part of an IAB node (e.g., a relay node). In the following description, the terms “terminal device”, “communication device”, “terminal”, “user equipment” and “UE” may be usedinterchangeably.

[0040] As used herein, the term “resource,” “transmission resource,” “resource block,” “physical resource block (PRB)”, “uplink resource,” or “downlink resource” may refer to any resource for performing a communication, for example, a communication between a terminal device and a network device, 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 combination of the time, frequency, space and / or code domain 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.

[0041] As used herein, “inter-centralized unit (CU)” may refer to the interactions and handovers occurring between different centralized units within a mobile communication network. CUs are network nodes responsible for handling higher-layer functions such as radio resource control and mobility management. The term “inter-CU” specifically pertains to the processes, procedures, and mechanisms involved when a user equipment (UE) transitions from one CU to another, ensuring continuous and seamless connectivity during the handover.

[0042] As used herein, “intra-CU” may refer to the interactions and handovers occurring among different distributed units (DUs) or different gNBs of a same CU within a mobile communication network. The term “intra-CU” specifically pertains to the processes, procedures, and mechanisms involved when a UE transitions from one DU / gNB to another DU / gNB of a same CU, ensuring continuous and seamless connectivity during the handover.

[0043] As mentioned above, technologies such as cell switch are proposed to ensure the communication continuousness in the wireless communication system. For example, LTM may be used for enabling the cell switch to reduce the mobility latency.

[0044] LTM is a cell switch procedure, where a serving cell of UE (primary cell, PCell or primary secondary cell, PSCell) is switched by the network by sending an LTM cell switch command. An LTM switch command is currently assumed delivered by MACsignaling using a MAC CE. Hence, not using radio resource control (RRC) signaling as a layer 3 (L3) based handover which is one of the current methods for changing between cells. LTM cell switch decision is based on measurements (for example layer 1, LI, measurements) that are performed and reported (for example LI measurement report) by the UE. Measurements and reporting are based on LTM candidate cell configuration provided by the network for one or more LTM candidate cells. An LTM candidate cell may be neighboring cells or a UE’s current serving cells (e.g. one of the current secondary cell).

[0045] In Release-18, LTM measurements on a neighboring candidate cell are performed using synchronization signal and physical broadcast channel (PBCH) blocks (SSBs) transmitted by the candidate cell for which the SSB configuration is provided to the UE.

[0046] Before the cell switch, network may optionally activate one or more transmission configuration indicator (TCI) state(s) for one or more candidate cells for early downlink (DL) synchronization. Once a candidate cell TCI state is activated the UE may start tracking the downlink time / frequency synchronization using the reference signals associated with the activated TCI state(s). The UE may also perform early uplink (UL) synchronization before the cell switch if this is requested by the network.

[0047] Reference is now made to FIG. 1, which illustrates a signaling flow for an overall procedure for LTM. As illustrated in FIG. 1, at step 1, the UE sends a MeasurementReport message to the gNB. Based on the measurement report, and / or other conditions, the gNB decides to configure LTM and initiates LTM preparation. At step 2, the gNB transmits an RRCReconfiguration message to the UE, and the RRCRe configuration message includes the LTM candidate configurations. At step 3, the UE stores the LTM candidate configurations and transmits an RRCReconfigurationComplete message to the gNB.

[0048] At step 4a, the UE performs DL synchronization with the candidate cell(s) before receiving the cell switch command. At step 4b, when UE-based timing advance (TA) measurement is configured, UE acquires the TA value(s) of the candidate cell(s) by measurement. UE performs early TA acquisition with the candidate cell(s) as requested by the network before receiving the cell switch command. This is done via contention free random access (CFRA) triggered by a physical downlink control channel (PDCCH) order from the source cell, following which the UE sends preamble towards the indicatedcandidate cell. In order to minimize the data interruption of the source cell due to CFRA towards the candidate cell(s), the UE does not receive random access response from the network for the purpose of TA value acquisition and the TA value of the candidate cell is indicated in the cell switch command. The UE does not maintain the TA timer for the candidate cell and relies on network implementation to guarantee the TA validity.

[0049] At step 5, the UE performs LI measurements on the configured candidate cell(s) and transmits LI measurement reports to the gNB. LI measurement should be performed as long as radio resource control (RRC) reconfiguration (step 2) is applicable.

[0050] At step 6, the gNB decides to execute cell switch to a target cell and transmits a medium access control (MAC) control element (CE) triggering cell switch by including the candidate configuration index of the target cell. The UE switches to the target cell and applies the configuration indicated by candidate configuration index.

[0051] At step 7, the UE performs the random access procedure towards the target cell, if UE does not have valid TA of the target cell. At step 8, the UE completes the LTM cell switch procedure by sending RRCReconfigurationComplete message to target cell. If the UE has performed a random access (RA) procedure in step 7 the UE considers that LTM cell switch execution is successfully completed when the random access procedure is successfully completed. For RA channel (RACH)-less LTM, the UE considers that LTM cell switch execution is successfully completed when the UE determines that the network has successfully received its first uplink (UL) data. The steps 4-8 can be performed multiple times for subsequent LTM using the LTM candidate configuration(s) provided in step 2. The procedure over the air interface described above is applicable to both intra-gNB-DU LTM and inter-gNB-DU LTM.

[0052] One objective for LTM is CSI acquisition for candidate cells, i.e., enhancements to LTM with CSLRS measurements where enabling CSI acquisition (e.g., acquiring the channel information such as channel quality indicator (CQI), rank indicator (RI), precoding matric indicator (PMI) and so on) on candidate cell(s) based on CSLRSs transmitted by the candidate cell(s). With this, the UE would be able to acquire and report the CSI parameters (CQI, PMI, RI, or / and LI) for a candidate cell, which then can be used for the transmission / reception in the target cell after the cell switch. This would reduce the need of additional measurements for CSI acquisition in the target cell for initialtransmissions / receptions.

[0053] Measurements related enhancements include specifying necessary components to support event triggered LI measurement reporting, specifying support for CSI-RS measurements for LTM procedures and enable CSI-RS based beam management, and specifying CSI acquisition on candidate cell(s) based on CSI-RS before or during LTM cell switch. Further, Measurement related enhancements are applicable to Intra-CU master cell group (MCG) / secondary cell group (SCG) LTM and Inter-CU MCG / SCG LTM.

[0054] In the context of the present disclosure, term of CPU in a cell may be replaced by any of the following: CPU on a cell, CPU for a cell, CPU with respect to a cell, CPU of a cell, or other similar expressions.

[0055] In the context of the present disclosure, term of CSLrelated information acquisition may be replaced by CSI acquisition.

[0056] It should be noted that example embodiments discussed herein may be applicable to intra-CU cell switch, inter-CU cell switch, inter-gNB cell switch and so on. In summary, the present disclosure is not limited to the specific cell switch type.Example Environment

[0057] FIG. 2A shows an example communication environment 200A in which example embodiments of the present disclosure may be implemented. The network communication 200 A includes a first apparatus 210, a second apparatus 220 and a third apparatuses 230.

[0058] In some example embodiments, the first apparatus 210 may be comprised in a terminal device / apparatus and the second apparatus 220 / third apparatus 230 may be comprised in a network device / apparatus. Additionally, the second apparatuses 220 and the third apparatus 230 may provide one or more coverage areas, also called as cells. As illustrated in FIG. 2A, the communication environment 200A includes a cell 250 provided by the second apparatus 220 and a cell 260 provided by the third apparatus 230.

[0059] Further, in some example embodiments, the radio access network (RAN) architecture may include a centralized part, or central unit (CU), and a distributed part, or distributed unit (DU). The CU and the DU may be connected to one another by a so-called Fl interface. In the example of FIG. 2A, the second apparatus 220 may refer to a base station (such as, the next generation node B, gNB), a gNB-CU and / or a gNB-DU.Similarly, the third apparatus 230 also may refer to a base station (such as, a gNB), a gNB CU and / or a gNB DU.

[0060] In the example of FIG. 2A, the first apparatus 210 may move over time. As illustrated in FIG. 2 A, the first apparatus 210 locates at different positions at different time points (T1 and T2). As moving, the first apparatus 210 may switch among different cells, i.e., a cell switch procedure. In the example of FIG. 2 A, the first apparatus 210 may switch from cell 250 to cell 260. For a better discussion, the cell 250 may be called as the first cell 250, the source cell 250 or the serving cell 250, and the cell 260 may be called as the second cell 260, the candidate cell 260. Further, in a case that the cell 260 is selected as a target cell, the cell 260 also may be called as the target cell 260.

[0061] Reference is now made to FIG. 2B, which illustrates other example communication environments 200B in which example embodiments of the present disclosure may be implemented. In the example (A) of FIG. 2B, the second apparatus 220 and the third apparatus 230 are gNB DUs, and both the second apparatus 220 and the third apparatus 230 are connected to a same gNB-CU. In the example (B) of FIG. 2B, the second apparatus 220 and the third apparatus 230 are gNB DUs, while the second apparatus 220 the third apparatus 230 are connected to two different gNB-CUs.

[0062] It should be noted examples (A) and (B) of FIG. 2B are two example communication environments of the present discourse which are illustrated only for the purpose of illustration without suggesting any limitations. In fact, the cell switch discussed herein may include at least one of the following: an inter-gNB cell switch, an intra-CU cell switch, or an inter-CU cell switch.

[0063] It is to be understood that the number of devices and their connections shown in FIG. 2A and FIG. 2B are only for the purpose of illustration without suggesting any limitation. The communication environments 200A and 200B may include any suitable number of devices configured to implementing example embodiments of the present disclosure. Although not shown, it would be appreciated that one or more additional devices may be located in the cell, and one or more additional cells may be deployed in the communication environments 200 A and 200B. It is noted that although illustrated as a network device, the second apparatus 220 / the third apparatus 230 may be another device than a network device. Although illustrated as a terminal device, the first apparatus 210may be another device than a terminal apparatus.

[0064] Communications in the communication environments 200A and 200B may be implemented according to any proper communication protocol(s), comprising, but not limited to, cellular communication protocols of the first generation (1G), the second generation (2G), the third generation (3G), the fourth generation (4G), the fifth generation (5G), 5.5G, the sixth generation (6G), and the like, wireless local network communication protocols such as Institute for Electrical and Electronics Engineers (IEEE) 802.11 and the like, and / or any other protocols currently known or to be developed in the future. Moreover, the communication may utilize any proper wireless communication technology, comprising but not limited to: Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Frequency Division Duplex (FDD), Time Division Duplex (TDD), Multiple-Input Multiple-Output (MIMO), Orthogonal Frequency Division Multiple (OFDM), Discrete Fourier Transform spread OFDM (DFT-s-OFDM) and / or any other technologies currently known or to be developed in the future.Work Principle and Example Signalling for Communication

[0065] In some solutions, three alternatives may be considered for the CSI acquisition related measurements and reporting: Alt-1: CSI-RS measurement and CSI reporting operations are performed before reception of LTM cell switch command (CSC) MAC CE, where the report is sent to the serving cell and transferred to the candidate / target cell(s); Alt-2: CSI-RS measurement can start before reception of LTM CSC MAC CE and CSI reporting operation is performed after reception of LTM CSC MAC CE, where the report is sent directly to target cell, as illustrated in FIG. 3 A; Alt-3: CSI-RS measurement and CSI reporting operations are performed after reception of LTM CSC MAC CE, as illustrated in FIG. 3B.

[0066] Generally speaking, CPU resources at the UE are limited, and thus CPU resources at the UE should be allocated and utilized reasonably. The details on current CPU occupancy for CSI measurements and reporting performed in the UE’s serving cell where the reports are always sent to the serving cell are discussed in the following.

[0067] The UE indicates the number of supported simultaneous CSI calculations NCPUwith parameter simultaneousCSLReportsPerCC or [simultaneousCSLSubReportsPerCC-rl8] in a component carrier, and simultaneousCSI-ReportsAllCC or [simultaneousCSI-SubReportsAllCC-rl8] across all component carriers.

[0068] If a UE supports NCPUsimultaneous CSI calculations it is said to have NCPUCSI processing units for processing CSI reports. If L CPUs are occupied for calculation of CSI reports in a given OFDM symbol, the UE has NCPU— L unoccupied CPUs. If N CSI reports start occupying their respective CPUs on the same OFDM symbol on which NCPU— L CPUs are unoccupied, where each CSI report n = 0, ...,N — 1 corresponds to the UE is not required to update the N — M requested CSI reports with lowest priority, where 0 < M < N is the largest value such that n=o OCPU — ^CPU ~ L holds.

[0069] A UE is not expected to be configured with an aperiodic CSI trigger state containing more than NCPUReporting Settings. Processing of a CSI report occupies a number of CPUs for a number of symbols as follows:■ OCPU= 0 for a CSI report with CSI-ReportConfig with higher layer parameter reportQuantity set to 'none' and CSI-RS-ResourceSet with higher layer parameter trs-Info configured;■ OCPU= 1 for a CSI report with LTM-CSI-ReportConfig or a CSI report with CSI-ReportConfig with higher layer parameter reportQuantity set to 'cri-RSRP', 'ssb-Index-RSRP', 'cri-SINR', 'ssb-Index-SINR', 'cri-RSRP- Index', 'ssb-Index-RSRP- Index', 'cri-SINR- Index', 'ssb-Index-SINR- Index ' or 'none' (and CSI-RS-ResourceSet with higher layer parameter trs-Info not configured);- otherwise, OCPU= Ks, where Ksis the number of CSI-RS resources in the CSI-RS resource set for channel measurement.

[0070] 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:- A periodic or semi-persistent CSI report (excluding an initial semi-persistent CSI report on PUSCH after the PDCCH triggering the report and a semi-persistent CSI report on PUSCH configured with the higher layer parameter codebookType set to 'typell-Doppler-rl 8' or 'typeII-Doppler-PortSelection-rl8') occupies CPU(s) from the first symbol of the earliest one of each CSI-RS / CSI-IM / SSB resource, or each CSI-RS / CSI-IM resourceassociated with all configured sub-configurations for periodic CSI report corresponding to a CSI-ReportConfig that contains a list of sub-configurations provided by csi-ReportSubConfigToAddModList, or each CSI-RS / CSI-IM resource associated with all activated / triggered sub -configurations for semi-persistent CSI report corresponding to a CSI-ReportConfig that contains a list of sub-configurations provided by csi-ReportSubConfigToAddModList, for channel or interference measurement, respective latest CSI-RS / CSI-IM / SSB occasion no later than the corresponding CSI reference resource, until the last symbol of the configured PUSCH / PUCCH carrying the report. 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.- An initial semi-persistent CSI report on PUSCH after the PDCCH trigger occupies CPU(s) from the first symbol after the PDCCH 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.

[0071] For a CSI report with CSI-ReportConfig with higher layer parameter reportQuantity set to 'none' and CSI-RS-ResourceSet with higher layer parameter trs-Info not configured, the CPU(s) are occupied for a number of OFDM symbols as follows: - A semi-persistent CSI report (excluding an initial semi-persistent CSI report on PUSCH after the PDCCH triggering the report) occupies CPU(s) from the first symbol of the earliest one of each transmission occasion of periodic or semi-persistent CSI-RS / SSB resource for channel measurement for Ll-RSRP computation, until Z3symbols after the last symbol of the latest one of the CSI-RS / SSB resource for channel measurement for Ll-RSRP computation in each transmission occasion.- An aperiodic CSI report occupies CPU(s) from the first symbol after the PDCCH triggering the CSI report until the last symbol between Z3symbols after the first symbol after the PDCCH triggering the CSI report and Z3symbols after the last symbol of the latest one of each CSI-RS / SSB resource for channel measurement for Ll-RSRPcomputation, where (Z3,Z^ are pre-defined.

[0072] As discussed above, one of the motivations of LTM is to maintain high data transmission efficiency (or spectral efficiency) in the process of fast cell switch. To achieve this, CSI acquisition based on CSI-RS for the candidate cells has been agreed as one of the objectives. With this, the UE would be able to acquire and report the CSI parameters (CQI, PMI, RI, or / and LI) for a candidate cell, which then can be used for the transmission / reception in the target cell after the cell switch. This would reduce the need of additional measurements for CSI acquisition in the target cell for initial transmissions / receptions.

[0073] For LI measurement reporting in the serving cell(s), the CPU processing is defined for periodic (P), semi-persistent (SP), and aperiodic (AP) reporting. Since each UE has limited CPU resources, it is essential to specify the UE’s CPU usage for each reporting type to minimize ambiguity between the network and the UE regarding the measurements it can perform and the reports it can generate. This information helps the network to optimize the configuration of measurements and reporting to suit the UE's capabilities.

[0074] Reference is now made to FIG. 3C, which illustrates an example of CPU occupancy for a periodic reporting. In the example of FIG. 3C, CPUs are calculated from the first symbol of the earliest one of each CSLRS / CSI-IM / SSB resource, respective latest CSI-RS / CSLIM / SSB occasion no later than the corresponding CSI reference resource, until the last symbol of the configured PUSCH / PUCCH carrying the report).

[0075] For CSI acquisition for a candidate cell during a cell switch procedure (such as, LTM cell switch), when a report is sent directly to the target cell after the reception of the cell switch command, the timing of the uplink slot containing the report cannot be determined at the time of measurements. If the UE performs measurements prior to the reception of the cell switch command, the timing of the cell switch command itself may not even be known, making it difficult to determine the timing of the reporting slot. Even when the UE starts performing measurements after the reception of the cell switch command, the exact timing of the reporting slot remains indeterminate due to various factors, e.g., the type of cell switch (e.g., RACH-less or RACH-based), occurrence of an uplink slot relative to the handover interruption delay, which itself depends on earlyprocedures such as early DL / UL synchronization and the processing of the RRC configuration and so on.

[0076] Therefore, determining the timeline for CPU usage in both the serving and target cells, particularly when the UE begins performing measurements before the reception of the cell switch command, becomes challenging. For example, non-optimal or relaxed CPU usage for CSI acquisition measurements of candidate cells in the current serving cell may impact the serving cell's measurements (e.g., a fewer CPUs for serving cell measurements). Therefore, it is crucial to properly define CPU usage for these new types of measurements and reporting.

[0077] According to some example embodiments of the present disclosure, the timeline for CPU occupancy for CSI acquisition for a candidate cell may be well defined in either the serving cell or the target cell, i.e. currently serving cell.

[0078] In some example embodiments, methods / rules are proposed to determine the CPU occupancy for the current serving cell (mobility source cell) when the UE supports, performs, starts to perform, or is configured to perform measurements prior to the reception of the cell switch command. Specifically, various alternatives are considered with respect to the timeline of RS transmission, the configuration or activation of the measurement application, the CSI reference resource, the cell switch command and other factors, which will be discussed in the following with reference to FIG. 4.

[0079] In some other example embodiments, methods / rules are proposed to determine the number of CPUs required for CSI acquisition measurements for candidate cells based on the UE’s capability. Further, in scenarios where the CPU usage limit is exceeded, prioritization to select the cells or RSs for CSI processing are proposed, such as based on TCI activation or TA acquisition and other factors, which will be discussed in the following with reference to FIG. 5.

[0080] In some other example embodiments, methods / rules are proposed to determine the CPU occupancy for the target cell, after the UE is commanded to switch to that cell, based on whether the UE performs or is configured to perform measurements after the reception of the cell switch command and other factors, which will be discussed in the following. Specifically, various alternatives are considered with respect to the timeline of RS transmission, decoding and processing of the target cell configuration, the CSIreference resource, the cell switch command and other factors, which will be discussed in the following with reference to FIG. 6.

[0081] It is noted the order acts shown in FIGS. 4-6 are only an example not limitation. Acts may be performed in any suitable manner. Example embodiments described with reference to FIGS. 4-6 may be implemented separately or combined in any manner. For example, one or more example embodiments shown in a single drawing may be combined with one or more example embodiments shown in one or more other drawings.

[0082] In the following discussion, a cell switch may comprise at least one of the following: an inter-gNB cell switch, an intra-CU cell switch, or an inter-CU cell switch.

[0083] Further, in the following discussions, the first apparatus 110 may comprise a terminal apparatus, the second apparatus 120 may comprise one of the following: a next generation node B (gNB) serving the first apparatus 110 (also called as a source gNB), a distributed unit (DU) connecting with the first apparatus 110 (also called as a source DU), or a centralized unit (CU) connecting with the source DU (also called as a source CU), and the third apparatus 130 may comprises one of the following: a target gNB (also called as a target gNB), a target DU, or a target CU.

[0084] Example embodiments where the CSI-related information acquisition are performed before the cell switch are discussed with reference to FIG. 4, which illustrates an example signaling flow 500 for communication in accordance with some example embodiments of the present disclosure.

[0085] As illustrated in FIG. 4, in operation, the second apparatus 220 (such as, a CU, source DU, source gNB) transmits (420-1) a mobility configuration to the first apparatus 210, and the first apparatus 210 receives (420-2) the mobility configuration accordingly.

[0086] In some example embodiments, the mobility configuration is a radio resource control signaling comprising LTM configuration or handover-related configuration, such as, an RRCReconfiguration message.

[0087] In some example embodiments, the mobility configuration indicates a plurality of candidate cells and a plurality of RS resources, e.g., CSI-RSs, for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition.

[0088] In some example embodiments, the CSI-related information may comprise at leastone of the following: a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), or CSLreference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0089] Based at least on the mobility configuration, the early CSI-related information acquisition may be triggered. Specifically, the first apparatus 210 determines (430) CSI-related information of at least one candidate cell of the plurality of candidate cells based at least in part on the CPU occupancy in the first cell, where the at least one candidate cell comprises a second cell.

[0090] In some example embodiments, the CPU occupancy in the first cell may be associated with the number of the plurality of candidate cells configured for measurements to acquire CSI-related information. Alternatively, or in addition, in some example embodiments, the CPU occupancy in the first cell may be associated with the number of RS resources configured for measurements to acquire CSI-related information. Alternatively, or in addition, in some example embodiments, the report quantities associated with a plurality of report configurations of the plurality of candidate cells. In some example embodiments, the report quantities considered for determine the CPU occupancy comprises at least one of the following: none, an RI, a PMI, a CQI, a CRI, an LI, or an RSRP.

[0091] According to some example embodiments of the present disclosure, the CPU occupancy in the first cell may be limited to the UE capability. In view of this, it is preferred that the first apparatus 210 may provide its capability information to the second apparatus 220 as discussed below.

[0092] In some example embodiments, the first apparatus may transmit (410-1) capability-related information to the second apparatus 220, and the second apparatus 220 may receive (410-2) the capability -related information accordingly. In some example embodiment, the capability-related information may indicate that the first apparatus 210 supports CSI calculation, measurements, or measurements using CSLRSs, for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving the cell switch command.

[0093] Alternatively, or in addition, in some example embodiments, the capability-related information may indicate a first maximum number of simultaneous CSIcalculations for CSI-related information acquisition supported by the first apparatus 210. Additionally, in some example embodiments, the first maximum number may be independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell for which the reports are sent to the first cell. Alternatively, in some example embodiments, the first maximum number may be the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell.

[0094] According to some example embodiments of the present disclosure, the timeline for CPU occupancy in the first cell may be well defined. Such example embodiments will be discussed in the following.

[0095] In some example embodiments, the measurement report may occupy at least one CPU during at least one symbol. In particulate, the starting and / or ending of the at least one symbol may be determined based on a plurality factors. Example factors include but not are limited to, a transmission of an RS resource corresponding to the second cell associated with the measurement report, a transmission of the mobility configuration, a transmission of an acknowledgment of the mobility configuration, a transmission of an activation command associated with the RS resource or transmission of the RS resource associated with the measurement report, a transmission of an acknowledgment of the activation command, a transmission of a control command comprising mobility information related to the second cell, a transmission of an acknowledgment of the control command, a transmission of the cell switch command, a transmission of an acknowledgment of the cell switch command, a reference uplink resource determined for the measurement report, or a CSI reference resource corresponding to the reference uplink resource or the measurement report.

[0096] In some example embodiments, the motility information relates to at least one of the following: activation of a measurement for the measurement report, transmission configuration indicator (TCI) state activation of at least one TCI state of the second cell, transmission configuration indicator (TCI) state activation of at least one TCI state associated with an RS to be measured for the CSI acquisition, random access channel (RACH) procedure on the second cell associated with an RS which is associated with an RS to be measured for the CSI acquisition, or random access channel (RACH) procedure on the second cell.

[0097] Details about how to determine the at least one symbol will be discussed in the following. Regarding the starting point, in some example embodiments, the at least one symbol may start at a first timing. In one example, the first timing may be the first symbol of the earliest RS resource corresponding to the second cell associated with the measurement report, after receiving the mobility configuration and no later than a downlink resource carrying the cell switch command. In another example, the first timing may be the first symbol of the earliest RS resource corresponding to the second cell associated with the measurement report, after receiving an activation command associated with the transmission of the RS resource and no later than a downlink resource carrying the cell switch command.

[0098] In a further example, the first timing may be the first symbol of the earliest RS resource corresponding to the second cell, after transmitting an acknowledgment of the mobility configuration and no later than the downlink resource carrying the cell switch command. In a further example, the first timing may be the first symbol of the earliest RS resource corresponding to the second cell, after transmitting an acknowledgment of the activation command and no later than the downlink resource carrying the cell switch command.

[0099] In a further example, the first timing may be the first or last symbol of a downlink resource carrying the mobility configuration. In a further example, the first timing may be the first or last symbol of an uplink resource carrying the acknowledgment of the mobility configuration. In a further example, the first timing may be the first or last symbol of a downlink resource carrying the control command comprising mobility information related to the second cell. In a further example, the first timing may be the first or last symbol of an uplink resource carrying the acknowledgment of the control command.

[0100] Alternatively, in some example embodiments, the at least one symbol may start at the first symbol of the latest RS resource corresponding to the second cell, no later than the CSI reference resource and the downlink resource carrying the cell switch command.

[0101] Regarding the ending point, in some example embodiments, the at least one symbol may end at a second timing. In one example, the second timing may be the first or last symbol of the downlink resource carrying the control command comprising the cell switch command. In another example, the second timing may be the first or last symbolof an uplink resource carrying the acknowledgment of the cell switch command.

[0102] Alternatively, in some example embodiments, the at least one symbol may end at a last symbol of the reference uplink resource and no later than the downlink resource carrying the cell switch command.

[0103] Alternatively, in some example embodiments, the at least one symbol may at the Nthsymbol after the latest RS resource corresponding to the second cell, and no later than the downlink resource carrying the cell switch command, and wherein N is an integer determined based on at least one of a capability of the first apparatus 210 or mobility configuration.

[0104] In addition, the first apparatus 210 may perform measurements and transmit (440-1) measurement results to the second apparatus 220, and the second apparatus 220 may receive (440-2) the measurement results accordingly. Based on the measurement results, the second apparatus 220 may determine a target cell (i.e., the second cell) to be switched from the plurality of candidate cells.

[0105] Based on the cell switch determination to the second cell, the second apparatus transmits (450-1) a cell switch command indicating the second cell to the first apparatus 210, and the first apparatus 210 receives (450-2) the cell switch command accordingly.

[0106] In response to the cell switch command, the first apparatus 210 may initiate a RACH procedure and access to the second cell or may perform RACH-less cell access to the second cell. Then, the first apparatus 210 transmits (460-1) a measurement report comprising CSI-related information of the second cell to third apparatus 230 which provides the second cell. In some examples, the measurement report may be sent a specific uplink message to the second cell, e.g., in the message containing the RRC Reconfiguration Complete message, which may be configured grant or dynamic grant based first uplink message in a RACH-less cell switch or a message 3 sent during the RACH procedure in a RACH-based cell switch. In some examples, the UE may be provided a dynamic uplink grant to send the measurement report. After receiving (460-2) the measurement report, the second cell may determine the CSI-related information, and thus the transmission on the second cell may be performed accordingly.

[0107] The CPU resources of the first apparatus 210 is limited. As discussed above, the first apparatus 210 needs to measure L1 / L3 RSRP, and needs to measure the CS-relatedinformation, both of which require CPU resources. In view of this, the CPU resources needs to be allocated and utilize reasonably. Example embodiment about allocation of CPU resources will be discussed with reference to FIG. 5, which illustrates an example signaling flow 500 for communication in accordance with some example embodiments of the present disclosure.

[0108] As illustrated in FIG. 5, in operation, the second apparatus 220 (such as, a CU, source DU, source gNB) transmits (520-1) a mobility configuration to the first apparatus 210, and the first apparatus 210 receives (520-2) the mobility configuration accordingly.

[0109] In some example embodiments, the mobility configuration may be a radio resource control signaling comprising LTM configuration or handover-related configuration, such as, an RRCReconfiguration message.

[0110] In some example embodiments, the mobility configuration indicates a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition.[OHl] In some example embodiments, the CSI-related information may comprise at least one of the following: an RI, a PMI, a CQI, a CRI, an LI, or an RSRP.

[0112] In some example embodiments, the first apparatus 210 allocates (530) CPU resources for CSI-related information acquisition for the plurality of candidate cells or the plurality of RS resources based on CPU occupancy in the first cell.

[0113] In some example embodiments, the CPU occupancy in the first cell may be associated with the number of the plurality of candidate cells configured for measurements to acquire CSI-related information. Alternatively, or in addition, in some example embodiments, the CPU occupancy in the first cell may be associated with the number of RS resources configured for measurements to acquire CSI-related information. Alternatively, or in addition, in some example embodiments, the report quantities associated with a plurality of report configurations of the plurality of candidate cells. In some example embodiments, the report quantities considered for determining the CPU occupancy comprises at least one of the following: none, an RI, a PMI, a CQI, a CRI, an LI, or an RSRP.

[0114] Alternatively, or in addition, in some example embodiments, the first apparatus210 allocates CPU resources for CSI-related information acquisition for the plurality of candidate cells or the plurality of RS resources based on a first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus 210.

[0115] Additionally, in some example embodiments, the first maximum number may be provided to the second apparatus 220 during capability reporting procedure. Specifically, as illustrated in FIG. 5, the first apparatus may transmit (510-1) capability-related information to the second apparatus 220, and the second apparatus 220 may receive (510-2) the capability-related information accordingly. In some example embodiment, the capability-related information may indicate that the first apparatus 210 supports CSI calculation or measurements for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving the cell switch command.

[0116] Alternatively, or in addition, in some example embodiments, the capability-related information may indicate the first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus 210. Additionally, in some example embodiments, the first maximum number may be independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell. Alternatively, in some example embodiments, the first maximum number may be the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell.

[0117] Alternatively, or in addition, in some example embodiments, the first apparatus 210 allocates CPU resources for CSI-related information acquisition for the plurality of candidate cells or the plurality of RS resources based on at least one priority rule for CSI-related information acquisition. Details about the at least one priority rule for CSI-related information acquisition will be discussed in the following.

[0118] In some example embodiments, at least one priority rule may comprise a priority order of the plurality of candidate cells or a priority order of the plurality of RS resources, configured by the second apparatus 220.

[0119] Alternatively, or in addition, in some example embodiments, at least one priority rule for CSI-related information acquisition may be associated with at least one of the following: whether there is at least one active transmission configuration indicator (TCI)state, whether a timing advance (TA) acquisition procedure has been performed or completed, whether an abstract syntax notation one (ASN.1) decoding procedure has been configured or completed, or a measurement result value.

[0120] In some example embodiments, in a case that a candidate cell is associated with an active TCI state, the first apparatus 210 may prioritize allocating CPU resources for CSI calculation of the candidate cell or an RS resource corresponding to the candidate cell. Accordingly, in some example embodiments, in a case that an RS of a candidate cell is associated with an active TCI state, the first apparatus 210 may prioritize allocating CPU resources for CSI calculation associated with the RS.

[0121] In some example embodiments, in a case that a TA acquisition procedure associated with a candidate cell has been performed or completed, the first apparatus 210 may prioritize allocating CPU resources for CSI calculation of the candidate cell or an RS resource corresponding to the candidate cell. Accordingly, in some example embodiments, in a case that a TA acquisition procedure associated with an RS of a candidate cell has been performed or completed, the first apparatus 210 may prioritize allocating CPU resources for CSI calculation associated with the RS.

[0122] In some example embodiments, in a case that an ASN.1 decoding procedure associated with a candidate cell has been configured or completed, the first apparatus 210 may prioritize allocating CPU resources for CSI calculation of the candidate cell or an RS resource corresponding to the candidate cell.

[0123] In some example embodiments, in a case that a candidate cell is associated with a larger measurement result value, the first apparatus 210 may prioritize allocating CPU resources for CSI calculation of the candidate cell or an RS resource set corresponding to the candidate cell. Accordingly, in some example embodiments, in a case that an RS of a candidate cell is associated with a larger measurement result value, the first apparatus 210 may prioritize allocating CPU resources for CSI calculation associated with the RS.

[0124] In addition, the first apparatus 210 may perform measurements and transmit (540-1) measurement results (such as, L1 / L3 RSRPs) to the second apparatus 220, and the second apparatus 220 may receive (540-2) the measurement results accordingly. Based on the measurement results, the second apparatus 220 may determine a target cell (i.e., the second cell) to be switched from the plurality of candidate cells.

[0125] Based on the cell switch determination to the second cell, the second apparatus transmits (550-1) a cell switch command indicating the second cell to the first apparatus 210, and the first apparatus 210 receives (550-2) the cell switch command accordingly.

[0126] According to some example embodiments of the present disclosure, the CPU occupancy in the second cell may be calculated, i.e. after the cell switch. In this case, the CPU occupancy in the second cell may be determined. Such example embodiment will be discussed with reference to FIG. 6.

[0127] In operation, the second apparatus 220 (such as, a CU, source DU, source gNB) transmits (620-1) a mobility configuration to the first apparatus 210, and the first apparatus 210 receives (620-2) the mobility configuration accordingly.

[0128] In some example embodiments, the mobility configuration may be a radio resource control signaling comprising LTM configuration or handover-related configuration, such as, an RRCReconfiguration message.

[0129] In some example embodiments, the mobility configuration indicates a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition.

[0130] In some example embodiments, the CSI-related information may comprise at least one of the following: an RI, a PMI, a CQI, a CRI, an LI, or an RSRP.

[0131] In addition, the first apparatus 210 may perform measurements and transmit (630-1) measurement results to the second apparatus 220, and the second apparatus 220 may receive (630-2) the measurement results accordingly. Based on the measurement results, the second apparatus 220 may determine a target cell (i.e., the second cell) to be switched from the plurality of candidate cells.

[0132] Based on the cell switch determination to the second cell, the second apparatus transmits (640-1) a cell switch command indicating the second cell to the first apparatus 210, and the first apparatus 210 receives (640-2) the cell switch command accordingly.

[0133] In the example of FIG. 6, after receiving the cell switch command, the first apparatus determines (650) CSI-related information of the second cell based at least on CPU occupancy in the second cell and the mobility configuration. Then, the first apparatus 210 transmits (660-1) a measurement report comprising CSI-related information of thesecond cell to third apparatus 230 which provides the second cell. In some examples, the measurement report may be sent in a specific uplink message to the second cell, e.g., in the message containing the RRC Reconfiguration Complete message, which may be configured grant or dynamic grant based on the first uplink message in a RACH-less cell switch or a message 3 sent during the RACH procedure in a RACH-based cell switch. In some examples, the first apparatus 210 may be provided with a dynamic uplink grant to send the measurement report. After receiving (660-2) the measurement report, the second cell may determine the CSI-related information, and thus the transmission on the second cell may be performed accordingly.

[0134] In some example embodiments, the CPU occupancy in the second cell may be determined when the first apparatus 210performs, continue to perform, or configured to perform measurements for CSI acquisition for the second cell after the reception of the cell switch command indicating the second cell. Alternatively, in some example embodiments, the CPU occupancy in the second cell may be determined when the first apparatus 210may not perform, not continue to perform, or not configured to perform measurements for CSI acquisition for the second cell after the reception of the cell switch command indicating the second cell, but the first apparatus 210 sends the measurement report associated with the CSI acquisition (determined based on the measurements performed before the reception of the cell switch) to the second cell.

[0135] In some example embodiments, the CPU occupancy in the second cell may be associated with the number of the plurality of candidate cells configured for measurements to acquire CSI-related information. Alternatively, or in addition, in some example embodiments, the CPU occupancy in the first cell may be associated with the number of RS resources configured for measurements to acquire CSI-related information. Alternatively, or in addition, in some example embodiments, the report quantities associated with a plurality of report configurations of the plurality of candidate cells. In some example embodiments, the report quantities considered for determine the CPU occupancy comprises at least one of the following: none, an RI, a PMI, a CQI, a CRI, an LI, or an RSRP.

[0136] According to some example embodiments of the present disclosure, the CPU occupancy in the second cell is limited to the UE capability. In view of this, it is preferred that the first apparatus may provide its capability information to the second apparatus 220as discussed below.

[0137] In some example embodiments, the first apparatus may transmit (610-1) capability-related information to the second apparatus 220, and the second apparatus 220 may receive (610-2) the capability -related information accordingly. In some example embodiment, the capability-related information may indicate that the first apparatus 210 supports CSI calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving the cell switch command.

[0138] Alternatively, or in addition, in some example embodiments, the capability-related information may indicate a first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus 210. Additionally, in some example embodiments, the first maximum number may be independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell. Alternatively, in some example embodiments, the first maximum number may be the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell.

[0139] According to some example embodiments of the present disclosure, the timeline for CPU occupancy in the second cell may be well defined. Such example embodiments will be discussed in the following.

[0140] In some example embodiments, the measurement report occupies at least one CPU during at least one symbol. In particulate, the starting and / or ending of the at least one symbol may be determined based on a plurality factors. Example factors include but not are limited to, a transmission of a RS resource corresponding to the second cell associated with the measurement report, a transmission of the cell switch command, a transmission of an acknowledgment of the cell switch command, a transmission of the measurement report, a reference uplink resource determined for the measurement report, a CSI reference resource corresponding to the reference uplink resource, or decoding and processing of a configuration of the second cell. Details about how to determine the at least one symbol will be discussed in the following.

[0141] Regarding the starting point, in some example embodiments, the at least one symbol starts at a first timing. In one example, the first timing may be the first or last symbol of the downlink resource carrying the cell switch command. In another example,the first timing may be the first or last symbol of the uplink resource carrying an acknowledgment of the cell switch command.

[0142] Alternatively, in some example embodiments, the at least one symbol starts at the first symbol of the earliest RS resource corresponding to the second cell associated with the measurement report, after receiving the cell switch command.

[0143] Alternatively, in some example embodiments, the at least one symbol starts at the first symbol after the first apparatus 210 completes decoding and processing of the configuration (given in the mobility configuration) of the second cell.

[0144] Alternatively, in some example embodiments, the at least one symbol starts at the first symbol of the latest RS resource corresponding to the second cell, after receiving the cell switch command and no later than the CSI reference resource.

[0145] Alternatively, in some example embodiments, the at least one symbol may be assumed to start being occupied upon a predefined event.

[0146] Regarding the ending point, in some example embodiments, the at least one symbol ends at the first or last symbol of an uplink resource carrying the measurement report.

[0147] Alternatively, in some example embodiments, the at least one symbol may end at the Mthsymbol after the latest RS resource corresponding to the second cell after receiving the cell switch command, and no later than the CSI reference resource, and wherein M is an integer determined based on at least one of a capability of the first apparatus 210 or mobility configuration.

[0148] Alternatively, in some example embodiments, the at least one symbol may end at the last symbol of the reference uplink resource, after receiving the cell switch command.

[0149] To better understand the above procedure, more examples will be discussed with reference to FIG. 7A to FIG. 7C. In the example of FIG. 7A to FIG. 7C, UE is used as an example of the first apparatus 210, source DU / CDU is used as an example of the second apparatus 220, target DU is used as an example of the third apparatus 230, cell 1 is used as an example of the first cell, cell 2 is used as an example of the second cell.

[0150] In the example of FIG. 7A, at step 1, UE capability for CSI Acquisition forcandidate cells may be provided to the source CU, such as, UE supporting of making measurements before the cell switch, the number of supported simultaneous CSI calculations for candidate cells, i.e. capability-related information as discussed above.

[0151] At step 2, UE may provide L3 / L1 measurement report to the source DU, and at step 3, source DU may provide the L3 / L1 measurement report to the source CU via UL RRC message transfer. Then, at step 4, LTM candidate preparation procedure may be performed.

[0152] With steps 5-7, LTM Configuration (i.e., mobility configuration as discussed above) may be provided to the UE, where the LTM configuration may contain the configuration of CSLRSs for CSI Acquisition from Cell 2. UE also may transmit an RRC Reconfiguration Complete, i.e., an acknowledgement of the mobility configuration.

[0153] Example embodiments where the UE is able to make CSI acquisition before the cell switch will be discussed with reference to FIG. 7B.

[0154] In operation, at step 8, UE determines CPU usage for the configured / activated report configs or measurements (as per the specified rules), as the example embodiments discussed with reference to FIG. 4.

[0155] At step 9, UE determines report configs or measurements for which measurements can be performed can be performed based on the determined CPU usage, as the example embodiments discussed with reference to FIG. 5. At step 10, UE performs measurements and acquire CSI using the valid determined P CSLRSs from cell 2 and prepare for the reporting of measurements.

[0156] At step 11, the UE receives cell change (i.e., CSC) (with Target Cell ID = cell 2) and at step 12, the CSI Report containing the CSI measurements may be transmitted on the target cell.

[0157] More operation in the cell 1 are further discussed. In one example embodiment, for a CSI report for a candidate cell, CPU occupancy rules may be defined for the current serving cell (mobility source cell) when the UE supports, performs, or is configured to perform measurements prior to the reception of the cell switch command.

[0158] In one example embodiment, a CSI report for a candidate cell occupies CPU(s) on one or more symbols defined by an interval starting from a first (or start) referencepoint / timing specific to CSI acquisition measurements for the candidate cell to a second (or an end) reference point / timing.

[0159] In one example embodiment (called as option SF1), the first reference point may be the first symbol of the earliest one of each candidate RSs associated with the CSI report for CSI acquisition after receiving the configuration or the activation command, no later the downlink slot containing the cell switch command

[0160] In one example embodiment (option SF2), the first reference point may be the first / last symbol of the downlink slot (or PDSCH) containing the information of HO / LTM configuration or the last symbol of the uplink slot (or PUCCH / PUSCH) carrying the acknowledgment for the HO / LTM configuration

[0161] In one example embodiment (option SF3), the first reference point may be the first / last symbol of the downlink slot (or PDCCH / PDSCH) carrying a control command (layer 1, e.g., DCI or layer 2, e.g., MAC CE) for the information related to a mobility candidate cell or the last symbol of the uplink slot (or PUCCH / PUSCH) carrying the acknowledgment for control information if any.

[0162] Examples for control command may include “activating / triggering the CSI measurements associated with the CSI acquisition for the candidate cell”, “candidate TCI activation / deactivation command activating / deactivating a TCI state associated with the candidate cell”, or “a PDCCH order triggering an early PRACH transmission towards the candidate cell”.

[0163] In one example embodiment (option SF4), the first reference point may be the first symbol of the latest candidate RS resource no later than the CSI reference resource corresponding to a reference uplink slot determined for the CSI report (e.g., it may be a virtual reporting slot when the actual reporting slot can’t be determined) and no later than the cell switch command,

[0164] In one example embodiment, options SF1 / SF2 / SF3 may be used when there is no CSI reference is defined for CSI acquisition measurement performed before the reception of the cell switch command

[0165] In one example embodiment (option SSI), the second reference point may be the last symbol of the downlink slot (or PDCCH / PDSCH) carrying the cell switch commandor the last symbol of the uplink slot (PUCCH / PUSCH) carrying the acknowledgment for the cell switch command

[0166] In one example embodiment (option SS2), the second reference point may be the last symbol of a reference uplink slot, no later than the cell switch command, determined for the CSI report (e.g., it may be a virtual reporting slot when the actual reporting slot can’t be determined). Option SSI may be used if the determined reference uplink slot occurs after the cell switch command.

[0167] In one example embodiment (option SS3), the second reference point may be Z’ symbols (CSI computation delay) after the latest candidate RS resource no later than the cell switch command. Option SSI may be used for second reference point exceeding after the cell switch command

[0168] In some example embodiments, the CSI report may be configured to be sent to the candidate cell after receiving the cell switch command indicating the candidate cell for cell switch

[0169] In some example embodiments, the CSI report may contain the information acquired CSI for the candidate cell, in terms of at least one of the measurement quantities: CQI, RI, PMI, CRI, and so on.

[0170] In some example embodiments, the configuration of the CSI report and associated measurement RSs may be given in the Handover (HO) or LTM configuration.

[0171] In some example embodiments, the UE may indicate the number of supported simultaneous CSI calculations, Ncpu_mobcsi (i.e., the first maximum number as discussed above), or CSI reporting associated with CSI acquisition measurements for candidate cells (or for CSI report configured to be sent to the candidate cell after receiving the cell switch).

[0172] In some example embodiments, Ncpu_mobcsi may be a separate UE capability (or limit) from the number of supported simultaneous CSI calculations for layer 1 periodic / SP / aperiodic reporting sent to the serving cell (i.e., NCPU MAC, the second maximum number as discussed above)).

[0173] In some example embodiments, the number of supported simultaneous CSI calculations for layer 1 periodic / SP / aperiodic reporting sent to the serving cell (i.e., NCPU_MAC ) may also apply to the number of CPU usage for CSI reporting associated withCSI acquisition measurements for candidate cells.

[0174] In some example embodiments, at any given point, the UE may not require to perform / update CSI calculations with CPU usage exceeding the limit (Ncpu_mobcsi or / and CPU_MAC)-

[0175] In some example embodiments, at any given time, the UE may select higher priority CSI reports from the set of CSI reports that starting to occupy CPUs (or higher priority measurements from the configured set that starting to occupy CPUs), ensuring that the number of CSI calculations (i.e., corresponding CPU usage) does not exceed the defined limit

[0176] In one option, the prioritization for CSI reporting associated with CSI acquisition measurements for candidate cells may be specified.

[0177] In one example, measurements linked to the active TCI state(s), candidate cells with at least one active TCI state, cells / RSs with TA acquisition (i.e., where the TA acquisition procedure has been performed or TA is available), cells for which early ASN.1 decoding / processing has been configured or completed, RSs based on Ll-RSRP quality (e.g., higher RSRP quality) may be prioritized.

[0178] In another example, it may be configured / indicated to the UE which candidate cells / RSs to be prioritized (e.g., along with a priority order) for CSI acquisition measurements

[0179] In one example, prioritization may be defined or performed for selecting the RSs / Cells from the RSs / Cells configured for early CSI acquisition measurements.

[0180] In one example, prioritization may be defined or performed for selecting the RSs / Cells from the RSs / Cells configured all types of measurements and reporting including the serving cell measurements and reporting and other types of candidate cell measurement and reporting like Ll-RSRP measurement reporting.

[0181] In one example embodiment, the number of CPU usage for a CSI reporting associated with CSI acquisition measurements for candidate cells may be defined based on the number of candidate cells or candidate RSs configured for the CSI acquisition measurements.

[0182] In one example embodiment, the number of CPU usage for a CSI reporting associated with CSI acquisition measurements for candidate cells may be defined based on reporting quantities (e.g., RI, PMI, CQI and so on) where in one option, the number of CPU usage may be defined considering the report quantity set to ‘none’ (note: as there is no report to the serving cell).

[0183] Example embodiments where the UE is able to make CSI acquisition before the cell switch will be discussed with reference to FIG. 7C.

[0184] At step 13, the UE receives cell change (i.e., CSC) (with Target Cell ID = cell 2). At step 14, UE determines CPU usage in cell 2 for the configured / activated report configs or measurements (as per the specified rules), as the example embodiments discussed with reference to FIG. 6.

[0185] At step 15, UE determines report configs or measurements for which measurements can be performed can be performed based on the determined CPU usage, as the example embodiments discussed with reference to FIG. 5 and FIG. 6.

[0186] At step 16, UE performs measurements and acquire CSI using the valid determined P CSI-RSs from cell 2 and prepare for the reporting of measurements, and at step 17, the CSI Report containing the CSI measurements may be transmitted on the target cell.

[0187] More operation in the cell 2 are further discussed. In one example embodiment, for a cell, a CSI report carrying the CSI performed before or during a cell switch procedure (or a CSI report carrying associated with early CSI acquisition), CPU occupancy rules may be defined.

[0188] In one example embodiment, for a cell, a CSI report carrying the CSI performed before or during a cell switch procedure (or a CSI report carrying associated with early CSI acquisition), CPU occupancy rules may be defined only when the UE performs or is configured to perform measurements after the reception of the cell switch command.

[0189] In one example embodiment, for a cell, a CSI report carrying the CSI performed before or during a cell switch procedure (or a CSI report associated with early CSI acquisition) may have CPU occupancy rules defined for CPU usage with a report quantity set to ‘none’ when the UE neither performs nor is configured to perform measurementsafter the reception of the cell switch command.

[0190] In one example embodiment, for a cell, a CSI report carrying the CSI performed before or during a cell switch procedure (or a CSI report carrying associated with early CSI acquisition), occupies CPU(s) on one or more symbols defined by an interval starting from a first (or start) reference point to a second (or and end) reference point, where:

[0191] In one example embodiment (option TF1), the first reference point may be the first symbol of the earliest one of each candidate RSs associated with the CSI report for CSI acquisition, after the reception of the cell switch command indicating the cell as the target cell

[0192] In one example embodiment (option TF32), the first reference point may be the last symbol of the uplink slot (PUCCH / PUSCH) carrying the acknowledgment for the cell switch command indicating the cell as the target cell

[0193] In one example embodiment (option TF3), the first reference point may be time when the UE has completed and processed the target cell configuration after the reception of the cell switch command indicating the cell as the target cell

[0194] In one example embodiment (option TF4), the first reference point may be the first symbol of the latest candidate RS resource, after the reception of the cell switch command but no later than the CSI reference resource corresponding to a reference uplink slot determined for the CSI report (e.g., it may be a virtual reporting slot when the actual reporting slot can’t be determined).

[0195] In one example embodiment (option TF5), the first reference point may not be explicitly defined (e.g., it is assumed that CPUs are occupied for the CSI report when the UE switches to the target cell, irrespective of any specific timeline)

[0196] In one example embodiment (option TS1), the second reference point may be the last symbol of the uplink slot (or PUCCH / PUSCH) carrying the report

[0197] In one example embodiment (option TS2), the second reference point may be Z’ symbols (CSI computation delay) after the latest candidate RS resource which occurs after the reception of the cell switch command but no later than the CSI reference resource corresponding to a reference uplink slot determined for the CSI report (e.g., it may be a virtual reporting slot when the actual reporting slot can’t be determined).

[0198] In one example embodiment (option TS3), the second reference point may be the last symbol of a reference uplink slot, after the cell switch command, determined for the CSI report (e.g., it may be a virtual reporting slot when the actual reporting slot can’t be determined).

[0199] In some example embodiments, the CSI report is configured to be sent to the target cell after receiving the cell switch command indicating the candidate cell for cell switch

[0200] In some example embodiments, the CSI report may contain the information acquired CSI for the candidate cell, in terms of at least one of the measurement quantities: CQI, RI, PMI, CRI, etc.

[0201] In some example embodiments, the configuration of the CSI report and associated measurement RSs may be given in the Handover (HO) or LTM configuration.

[0202] In some example embodiments, the UE may indicate the number of supported simultaneous CSI calculations, Ncpu_mobcsi, for CSI reporting associated with early CSI acquisition measurements when the UE switches to the cell.

[0203] In some example embodiments, this may be a separate UE capability (or limit) from the number of supported simultaneous CSI calculations for measurements and reports configured in the serving cell configuration, used for serving cell procedures (i.e., not given as a part of the HO / LTM configuration) .

[0204] In some example embodiments, the number of supported simultaneous CSI calculations for measurements and reports configured in the serving cell configuration, used for serving cell procedures, (i.e., not given as a part of the HO / LTM configuration) may also apply to the number of CPU usage for CSI reporting associated with early CSI acquisition measurements

[0205] In some example embodiments, reports configured I layer 1 periodic / SP / aperiodic reporting sent to the serving cell (i.e., NCPU MAC) may also apply to the number of CPU usage for CSI reporting associated with CSI acquisition measurements for candidate cells

[0206] In some example embodiments, at any given point, the UE may not require to perform / update CSI calculations with CPU usage exceeding the limit(s).

[0207] Reference is now made to FIG. 8A, which illustrates the CPU occupancy in the serving cell using option SF1 and option SSI before the cell switch command, and in the target cell (new serving cell) using option TF1 and option TS1 after the cell switch command.

[0208] Another example (with optimized use of CPU usage) is illustrated in FIG. 8B, where the CPU occupancy in the serving cell using option SF4 and option SS2 before the cell switch command, and in the target cell (new serving cell) using option TF4 and option TS3 after the cell switch command.

[0209] According to the above procedures, rules for CPU occupancy timeline may be defined for both serving and the target cell based on whether the UE makes measurement before the reception of the cell switch command, and rules for number of CPUs to be occupied can be defined for both serving and the target cell based on whether the UE makes measurement before the reception of the cell switch command. As a result, the network device may use this information to configure different measurements and reports appropriately.Example Methods

[0210] FIG. 9 shows a flowchart of an example method 900 implemented at a first apparatus in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 900 will be described from the perspective of the first apparatus 210 in FIG. 2 A and FIG. 2B.

[0211] At block 910, the first apparatus receives, from a second apparatus providing a first cell serving the first apparatus, a mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition.

[0212] At block 920, the first apparatus determines, based at least on CPU occupancy in the first cell and the mobility configuration, CSI-related information of at least one candidate cell of the plurality of candidate cells, the at least one candidate cell comprising a second cell.

[0213] At block 930, the first apparatus receives, from the second apparatus, a cell switch command indicating the second cell.

[0214] At block 940, the first apparatus transmits, to a third apparatus providing the second cell, a measurement report comprising CSI-related information of the second cell.

[0215] In some example embodiments, the measurement report occupies at least one CPU during at least one symbol based on at least one of: a transmission of a RS resource corresponding to the second cell associated with the measurement report, a transmission of the mobility configuration, a transmission of an acknowledgment of the mobility configuration, a transmission of an activation command associated with the transmission of the RS resource associated with the measurement report, a transmission of an acknowledgment of the activation command, a transmission of a control command comprising mobility information related to the second cell, a transmission of an acknowledgment of the control command, a transmission of the cell switch command, a transmission of an acknowledgment of the cell switch command, a reference uplink resource determined for the measurement report, or a CSI reference resource corresponding to the reference uplink resource.

[0216] In some example embodiments, the motility information relates to at least one of the following: activation of a measurement for the measurement report, transmission configuration indicator (TCI) state activation of at least one TCI state of the second cell, or random access channel (RACH) procedure on the second cell.

[0217] In some example embodiments, the at least one symbol starts at a first timing comprising at least one of: the first symbol of the earliest RS resource corresponding to the second cell associated with the measurement report, after receiving the mobility configuration and no later than a downlink resource carrying the cell switch command, the first symbol of the earliest RS resource corresponding to the second cell associated with the measurement report, after receiving an activation command associated with the transmission of the RS resource and no later than a downlink resource carrying the cell switch command, the first symbol of the earliest RS resource corresponding to the second cell, after transmitting an acknowledgment of the mobility configuration and no later than the downlink resource carrying the cell switch command, or the first symbol of the earliest RS resource corresponding to the second cell, after transmitting an acknowledgment of the activation command and no later than the downlink resource carrying the cell switch command.

[0218] In some example embodiments, the at least one symbol starts at a first timing comprising at least one of: the first or last symbol of a downlink resource carrying the mobility configuration, the first or last symbol of an uplink resource carrying the acknowledgment of the mobility configuration.

[0219] In some example embodiments, the at least one symbol starts at a first timing comprising at least one of the first or last symbol of a downlink resource carrying the control command comprising mobility information related to the second cell, or the first or last symbol of an uplink resource carrying the acknowledgment of the control command.

[0220] In some example embodiments, the at least one symbol starts at the first symbol of the latest RS resource corresponding to the second cell, no later than the CSI reference resource and the downlink resource carrying the cell switch command.

[0221] In some example embodiments, the at least one symbol ends at a second timing comprising at least one of the first or last symbol of the downlink resource carrying the control command comprising the cell switch command, or the first or last symbol of an uplink resource carrying the acknowledgment of the cell switch command.

[0222] In some example embodiments, the at least one symbol ends at a last symbol of the reference uplink resource and no later than the downlink resource carrying the cell switch command.

[0223] In some example embodiments, the at least one symbol ends at the Nthsymbol after the latest RS resource corresponding to the second cell, and no later than the downlink resource carrying the cell switch command, and wherein N is an integer determined based on at least one of a capability of the first apparatus or mobility configuration.

[0224] In some example embodiments, the CPU occupancy in the first cell is associated with at least one of the number of the plurality of candidate cells configured for measurements to acquire CSI-related information, the number of RS resources configured for measurements to acquire CSI-related information, or the report quantities associated with a plurality of report configurations of the plurality of candidate cells.

[0225] In some example embodiments, the report quantities considered for determine the CPU occupancy comprises at least one of the following: none, a rank indication (RI), aprecoding matrix indicator (PMI), a channel quality indicator (CQI), CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0226] In some example embodiments, the method 900 further comprises: transmitting, to the second apparatus, capability-related information indicating at least one of: that the first apparatus supports CSI calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving the cell switch command, or a first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus.

[0227] In some example embodiments, the first maximum number is independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell, or the first maximum number is the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell.

[0228] In some example embodiments, the CSI-related information comprises at least one of the following: a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), or CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0229] In some example embodiments, the mobility configuration is a radio resource control signaling comprising Layerl / Layer2 triggered mobility (LTM) configuration or handover-related configuration.

[0230] In some example embodiments, the first apparatus comprises a terminal device and the second apparatus comprises a network device.

[0231] FIG. 10 shows a flowchart of an example method 1000 implemented at a second apparatus in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 1000 will be described from the perspective of the second apparatus 220 in FIG. 2 A and FIG. 2B.

[0232] At block 1010, the second apparatus receives, from a first apparatus, capability-related information indicating at least one of: that the first apparatus supports CSI calculation for acquiring the CSI-related information of at least one candidate cell of theplurality of candidate cells prior to receiving the cell switch command, or a first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus.

[0233] At block 1020, the second apparatus transmits, based on the capability-related information, a mobility configuration to the first apparatus, the mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition.

[0234] At block 1030, the second apparatus receives, from the first apparatus, measurement results of the plurality of candidate cells.

[0235] At block 1040, the second apparatus transmits, based on the measurement results, a cell switch command indicating a second cell from the plurality of candidate cells.

[0236] In some example embodiments, the first maximum number is independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell, or the first maximum number is the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell.

[0237] In some example embodiments, the CSI-related information comprises at least one of the following: a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), or CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0238] In some example embodiments, the mobility configuration is a radio resource control signaling comprising Layerl / Layer2 triggered mobility (LTM) configuration or handover-related configuration.

[0239] In some example embodiments, the first apparatus comprises a terminal device and the second apparatus comprises a network device.

[0240] FIG. 11 shows a flowchart of an example method 1100 implemented at a first apparatus in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 1100 will be described from the perspective of the first apparatus 210 in FIG. 2 A and FIG. 2B.

[0241] At block 1110, the first apparatus receives, from a second apparatus providing a first cell serving the first apparatus, a mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition.

[0242] At block 1120, the first apparatus allocates CPU resources for CSI-related information acquisition for the plurality of candidate cells or the plurality of RS resources based on at least one of the following: CPU occupancy in the first cell, a first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus, or at least one priority rule for CSI-related information acquisition.

[0243] In some example embodiments, at least one priority rule comprises a priority order of the plurality of candidate cells or a priority order of the plurality of RS resources, configured by the second apparatus.

[0244] In some example embodiments, at least one priority rule for CSI-related information acquisition is associated with at least one of the following: whether there is at least one active transmission configuration indicator (TCI) state, whether a timing advance (TA) acquisition procedure has been performed or completed, whether an abstract syntax notation one (ASN.1) decoding procedure has been configured or completed, or a measurement result value.

[0245] In some example embodiments, in accordance with a determination that a candidate cell is associated with an active TCI state, the first apparatus prioritize allocating CPU resources for CSI calculation of the candidate cell or an RS resource corresponding to the candidate cell, or in accordance with a determination that an RS of a candidate cell is associated with an active TCI state, the first apparatus prioritize allocating CPU resources for CSI calculation associated with the RS.

[0246] In some example embodiments, in accordance with a determination that a TA acquisition procedure associated with a candidate cell has been performed or completed, the first apparatus prioritize allocating CPU resources for CSI calculation of the candidate cell or an RS resource corresponding to the candidate cell, or in accordance with a determination that a TA acquisition procedure associated with an RS of a candidate cell has been performed or completed, the first apparatus prioritize allocating CPU resourcesfor CSI calculation associated with the RS.

[0247] In some example embodiments, in accordance with a determination that an ASN.l decoding procedure associated with a candidate cell has been configured or completed, the first apparatus may prioritize allocating CPU resources for CSI calculation of the candidate cell or an RS resource corresponding to the candidate cell.

[0248] In some example embodiments, in accordance with a determination that a candidate cell is associated with a larger measurement result value, the first apparatus prioritize allocating CPU resources for CSI calculation of the candidate cell or an RS resource set corresponding to the candidate cell, or in accordance with a determination that an RS of a candidate cell is associated with a larger measurement result value, the first apparatus prioritize allocating CPU resources for CSI calculation associated with the RS.

[0249] In some example embodiments, the CPU occupancy in the first cell is associated with at least one of the number of the plurality of candidate cells configured for measurements to acquire CSI-related information, the number of the plurality of RS resources for measurements to acquire CSI-related information, or the report quantities associated with a plurality of report configurations of the plurality of candidate cells.

[0250] In some example embodiments, the report quantities considered for determine the CPU occupancy comprises at least one of the following: none, a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0251] In some example embodiments, the method 1100 further comprises: transmitting, to the second apparatus, capability-related information indicating at least one of: that the first apparatus supports CSI calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving a cell switch command, or the first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus.

[0252] In some example embodiments, the first maximum number is independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell, or the first maximum number is the same as a second maximumnumber of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell.

[0253] In some example embodiments, the CSI-related information comprises at least one of the following: a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), or CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0254] In some example embodiments, the mobility configuration is a radio resource control signaling comprising Layerl / Layer2 triggered mobility (LTM) configuration or handover-related configuration.

[0255] In some example embodiments, the first apparatus comprises a terminal device and the second apparatus comprises a network device.

[0256] FIG. 12 shows a flowchart of an example method 1200 implemented at a second apparatus in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 1200 will be described from the perspective of the second apparatus 220 in FIG. 2 A and FIG. 2B.

[0257] At block 1210, the second apparatus transmits, to a first apparatus, a mobility configuration to the first apparatus, the mobility configuration indicating the following: a plurality of candidate cells, a plurality of RS resources for CSI acquisition, and at least one priority rule for CSI-related information acquisition.

[0258] At block 1220, the second apparatus receives, from the first apparatus, measurement results of the plurality of candidate cells.

[0259] At block 1230, the second apparatus transmits, based on the measurement results, a cell switch command indicating a second cell from the plurality of candidate cells.

[0260] In some example embodiments, at least one priority rule comprises a priority order of the plurality of candidate cells or a priority order of the plurality of RS resource sets.

[0261] In some example embodiments, at least one priority rule for CSI-related information acquisition is associated with at least one of the following: whether there is at least one active transmission configuration indicator (TCI) state, whether a timingadvance (TA) acquisition procedure has been performed or completed, whether an abstract syntax notation one (ASN.1) decoding procedure has been configured or completed, or a measurement result value.

[0262] In some example embodiments, the second apparatus may receive, from the first apparatus, capability-related information indicating at least one of that the first apparatus supports CSI calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving the cell switch command, or the first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus.

[0263] In some example embodiments, the first maximum number is independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell, or the first maximum number is the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell.

[0264] In some example embodiments, the CSI-related information comprises at least one of the following: a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), or CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0265] In some example embodiments, the mobility configuration is a radio resource control signaling comprising Layerl / Layer2 triggered mobility (LTM) configuration or handover-related configuration.

[0266] In some example embodiments, the first apparatus comprises a terminal device and the second apparatus comprises a network device.

[0267] FIG. 13 shows a flowchart of an example method 1300 implemented at a first apparatus in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the methodl300 will be described from the perspective of the first apparatus 210 in FIG. 2 A and FIG. 2B.

[0268] At block 1310, the first apparatus receives from a second apparatus providing a first cell serving the first apparatus, a mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of theplurality of candidate cells for CSI-related information acquisition.

[0269] At block 1320, the first apparatus receives, from the second apparatus, a cell switch command indicating a second cell of the plurality of candidate cells.

[0270] At block 1330, the first apparatus determines, based at least on CPU occupancy in the second cell and the mobility configuration, CSI-related information of the second cell.

[0271] At block 1340, the first apparatus transmits, to a third apparatus providing the second cell, a measurement report comprising the CSI-related information of the second cell.

[0272] In some example embodiments, the measurement report occupies at least one CPU during at least one symbol based on at least one of a transmission of a RS resource corresponding to the second cell associated with the measurement report, a transmission of the cell switch command, a transmission of an acknowledgment of the cell switch command, a transmission of the measurement report, a reference uplink resource determined for the measurement report, a CSI reference resource corresponding to the reference uplink resource, or decoding and processing of a configuration of the second cell.

[0273] In some example embodiments, the at least one symbol starts at the first symbol of the earliest RS resource corresponding to the second cell associated with the measurement report, after receiving the cell switch command.

[0274] In some example embodiments, the at least one symbol starts at a first timing comprising at least one of the first or last symbol of the downlink resource carrying the cell switch command, or the first or last symbol of the uplink resource carrying an acknowledgment of the cell switch command.

[0275] In some example embodiments, the at least one symbol starts at the first symbol after the first apparatus completes decoding and processing of the configuration of the second cell.

[0276] In some example embodiments, the at least one symbol starts at the first symbol of the latest RS resource corresponding to the second cell, after receiving the cell switch command and no later than the CSI reference resource.

[0277] In some example embodiments, the at least one symbol is assumed to start being occupied upon a predefined event.

[0278] In some example embodiments, the at least one symbol ends at the first or last symbol of an uplink resource carrying the measurement report.

[0279] In some example embodiments, the at least one symbol ends at the Mthsymbol after the latest RS resource corresponding to the second cell after receiving the cell switch command, and no later than the CSI reference resource, and wherein M is an integer determined based on at least one of a capability of the first apparatus or mobility configuration.

[0280] In some example embodiments, the at least one symbol ends at the last symbol of the reference uplink resource, after receiving the cell switch command.

[0281] In some example embodiments, the CPU occupancy in the second cell is associated with at least one of the number of the plurality of RS resources for measurements to acquire CSI-related information, or the report quantities associated with a plurality of report configurations of the plurality of candidate cells.

[0282] In some example embodiments, the report quantities considered for determine the CPU occupancy comprises at least one of the following: none, a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0283] In some example embodiments, the methodl300 further comprises: transmitting, to the second apparatus, capability-related information indicating at least one of: the first apparatus supporting CSI calculation for acquiring the CSI-related information of a candidate cell after receiving the cell switch command, or a first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus.

[0284] In some example embodiments, the first maximum number is independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the second cell, or the first maximum number is the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reportingin the second cell.

[0285] In some example embodiments, the CSI-related information comprises at least one of the following: a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), a CSI-RS resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0286] In some example embodiments, the mobility configuration is a radio resource control signaling comprising Layerl / Layer2 triggered mobility (LTM) configuration or handover-related configuration.

[0287] In some example embodiments, the first apparatus comprises a terminal device and the second apparatus comprises a network device.

[0288] FIG. 14 shows a flowchart of an example method 1400 implemented at a second apparatus in accordance with some example embodiments of the present disclosure. For the purpose of discussion, the method 1400 will be described from the perspective of the second apparatus 220 in FIG. 2 A and FIG. 2B.

[0289] At block 1410, the second apparatus receives, from a first apparatus, capability-related information indicating at least one of that the first apparatus supports CSI calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells after receiving the cell switch command, or a first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus.

[0290] At block 1420, the second apparatus transmits, based on the capability-related information, a mobility configuration to the first apparatus, the mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition.

[0291] At block 1430, the second apparatus receives, from the first apparatus, measurement results of the plurality of candidate cells.

[0292] At block 1440, the second apparatus transmits, based on the measurement results, a cell switch command indicating a second cell from the plurality of candidate cells.

[0293] In some example embodiments, the first maximum number is independent from asecond maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell, or the first maximum number is the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell.

[0294] In some example embodiments, the CPU occupancy in the second cell is associated with at least one of the number of the plurality of RS resources for measurements to acquire CSI-related information, or the report quantities associated with a plurality of report configurations of the plurality of candidate cells.

[0295] In some example embodiments, the report quantities considered for determine the CPU occupancy comprises at least one of the following: none, a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0296] In some example embodiments, the CSI-related information comprises at least one of the following: a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), or CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0297] In some example embodiments, the mobility configuration is a radio resource control signaling comprising Layerl / Layer2 triggered mobility (LTM) configuration or handover-related configuration.

[0298] In some example embodiments, the first apparatus comprises a terminal device and the second apparatus comprises a network device.Example Devices, apparatuses and CRMs

[0299] In some example embodiments, a first apparatus capable of performing any of the method 900 (for example, the first apparatus 210 in FIG. 2A and FIG. 2B) may comprise means for performing the respective operations 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. The first apparatus may be implemented as or included in the first apparatus 210 in FIG. 2 A and FIG. 2B.

[0300] In some example embodiments, the first apparatus comprises means for receiving,from a second apparatus providing a first cell serving the first apparatus, a mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition; means for determining, based at least on CPU occupancy in the first cell and the mobility configuration, CSI-related information of at least one candidate cell of the plurality of candidate cells, the at least one candidate cell comprising a second cell; means for receiving, from the second apparatus, a cell switch command indicating the second cell; and means for transmitting, to a third apparatus providing the second cell, a measurement report comprising CSI-related information of the second cell.

[0301] In some example embodiments, the measurement report occupies at least one CPU during at least one symbol based on at least one of a transmission of a RS resource corresponding to the second cell associated with the measurement report, a transmission of the mobility configuration, a transmission of an acknowledgment of the mobility configuration, a transmission of an activation command associated with the transmission of the RS resource associated with the measurement report, a transmission of an acknowledgment of the activation command, a transmission of a control command comprising mobility information related to the second cell, a transmission of an acknowledgment of the control command, a transmission of the cell switch command, a transmission of an acknowledgment of the cell switch command, a reference uplink resource determined for the measurement report, or a CSI reference resource corresponding to the reference uplink resource.

[0302] In some example embodiments, the motility information relates to at least one of the following: activation of a measurement for the measurement report, transmission configuration indicator (TCI) state activation of at least one TCI state of the second cell, or random access channel (RACH) procedure on the second cell.

[0303] In some example embodiments, the at least one symbol starts at a first timing comprising at least one of the first symbol of the earliest RS resource corresponding to the second cell associated with the measurement report, after receiving the mobility configuration and no later than a downlink resource carrying the cell switch command, the first symbol of the earliest RS resource corresponding to the second cell associated with the measurement report, after receiving an activation command associated with the transmission of the RS resource and no later than a downlink resource carrying the cellswitch command, the first symbol of the earliest RS resource corresponding to the second cell, after transmitting an acknowledgment of the mobility configuration and no later than the downlink resource carrying the cell switch command, or the first symbol of the earliest RS resource corresponding to the second cell, after transmitting an acknowledgment of the activation command and no later than the downlink resource carrying the cell switch command.

[0304] In some example embodiments, the at least one symbol starts at a first timing comprising at least one of the first or last symbol of a downlink resource carrying the mobility configuration, the first or last symbol of an uplink resource carrying the acknowledgment of the mobility configuration.

[0305] In some example embodiments, the at least one symbol starts at a first timing comprising at least one of the first or last symbol of a downlink resource carrying the control command comprising mobility information related to the second cell, or the first or last symbol of an uplink resource carrying the acknowledgment of the control command.

[0306] In some example embodiments, the at least one symbol starts at the first symbol of the latest RS resource corresponding to the second cell, no later than the CSI reference resource and the downlink resource carrying the cell switch command.

[0307] In some example embodiments, the at least one symbol ends at a second timing comprising at least one of the first or last symbol of the downlink resource carrying the control command comprising the cell switch command, or the first or last symbol of an uplink resource carrying the acknowledgment of the cell switch command.

[0308] In some example embodiments, the at least one symbol ends at a last symbol of the reference uplink resource and no later than the downlink resource carrying the cell switch command.

[0309] In some example embodiments, the at least one symbol ends at the Nthsymbol after the latest RS resource corresponding to the second cell, and no later than the downlink resource carrying the cell switch command, and wherein N is an integer determined based on at least one of a capability of the first apparatus or mobility configuration.

[0310] In some example embodiments, the CPU occupancy in the first cell is associatedwith at least one of: the number of the plurality of candidate cells configured for measurements to acquire CSI-related information, the number of RS resources configured for measurements to acquire CSI-related information, or the report quantities associated with a plurality of report configurations of the plurality of candidate cells.

[0311] In some example embodiments, the report quantities considered for determine the CPU occupancy comprises at least one of the following: none, a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0312] In some example embodiments, the first apparatus further comprises: means for transmitting, to the second apparatus, capability-related information indicating at least one of: that the first apparatus supports CSI calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving the cell switch command, or a first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus.

[0313] In some example embodiments, the first maximum number is independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell, or the first maximum number is the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell.

[0314] In some example embodiments, the CSI-related information comprises at least one of the following: a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), or CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0315] In some example embodiments, the mobility configuration is a radio resource control signaling comprising Layerl / Layer2 triggered mobility (LTM) configuration or handover-related configuration.

[0316] In some example embodiments, the first apparatus comprises a terminal device and the second apparatus comprises a network device.

[0317] In some example embodiments, a second apparatus capable of performing any ofthe method 1000 (for example, the second apparatus 220 in FIG. 2A and FIG. 2B) may comprise means for performing the respective operations 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. The second apparatus may be implemented as or included in the second apparatus 220 in FIG. 2 A and FIG. 2B.

[0318] In some example embodiments, the second apparatus comprises means for receiving, from a first apparatus, capability-related information indicating at least one of: that the first apparatus supports CSI calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving the cell switch command, or a first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus; means for transmitting, based on the capability-related information, a mobility configuration to the first apparatus, the mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition; means for receiving, from the first apparatus, measurement results of the plurality of candidate cells; and means for transmitting, based on the measurement results, a cell switch command indicating a second cell from the plurality of candidate cells.

[0319] In some example embodiments, the first maximum number is independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell, or the first maximum number is the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell.

[0320] In some example embodiments, the CSI-related information comprises at least one of the following: a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), or CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0321] In some example embodiments, the mobility configuration is a radio resource control signaling comprising Layerl / Layer2 triggered mobility (LTM) configuration or handover-related configuration.

[0322] In some example embodiments, the first apparatus comprises a terminal deviceand the second apparatus comprises a network device.

[0323] In some example embodiments, a first apparatus capable of performing any of the method 1100 (for example, the first apparatus 210 in FIG. 2A and FIG. 2B) may comprise means for performing the respective operations 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. The first apparatus may be implemented as or included in the first apparatus 210 in FIG. 2 A and FIG. 2B.

[0324] In some example embodiments, the first apparatus comprises means for receiving, from a second apparatus providing a first cell serving the first apparatus, a mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition; and means for allocating CPU resources for CSI-related information acquisition for the plurality of candidate cells or the plurality of RS resources based on at least one of the following: CPU occupancy in the first cell, a first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus, or at least one priority rule for CSI-related information acquisition.

[0325] In some example embodiments, at least one priority rule comprises a priority order of the plurality of candidate cells or a priority order of the plurality of RS resources, configured by the second apparatus.

[0326] In some example embodiments, at least one priority rule for CSI-related information acquisition is associated with at least one of the following: whether there is at least one active transmission configuration indicator (TCI) state, whether a timing advance (TA) acquisition procedure has been performed or completed, whether an abstract syntax notation one (ASN.1) decoding procedure has been configured or completed, or a measurement result value.

[0327] In some example embodiments, the first apparatus is caused to at least one of: in accordance with a determination that a candidate cell is associated with an active TCI state, prioritize allocating CPU resources for CSI calculation of the candidate cell or an RS resource corresponding to the candidate cell, or in accordance with a determination that an RS of a candidate cell is associated with an active TCI state, prioritize allocating CPU resources for CSI calculation associated with the RS.

[0328] In some example embodiments, the first apparatus is caused to at least one of: in accordance with a determination that a TA acquisition procedure associated with a candidate cell has been performed or completed, prioritize allocating CPU resources for CSI calculation of the candidate cell or an RS resource corresponding to the candidate cell, or in accordance with a determination that a TA acquisition procedure associated with an RS of a candidate cell has been performed or completed, prioritize allocating CPU resources for CSI calculation associated with the RS.

[0329] In some example embodiments, the first apparatus further comprises: means for in accordance with a determination that an ASN.1 decoding procedure associated with a candidate cell has been configured or completed, prioritizing allocating CPU resources for CSI calculation of the candidate cell or an RS resource corresponding to the candidate cell.

[0330] In some example embodiments, the first apparatus is caused to at least one of: in accordance with a determination that a candidate cell is associated with a larger measurement result value, prioritize allocating CPU resources for CSI calculation of the candidate cell or an RS resource set corresponding to the candidate cell, or in accordance with a determination that an RS of a candidate cell is associated with a larger measurement result value, prioritize allocating CPU resources for CSI calculation associated with the RS.

[0331] In some example embodiments, the CPU occupancy in the first cell is associated with at least one of: the number of the plurality of candidate cells configured for measurements to acquire CSI-related information, the number of the plurality of RS resources for measurements to acquire CSI-related information, or the report quantities associated with a plurality of report configurations of the plurality of candidate cells.

[0332] In some example embodiments, the report quantities considered for determine the CPU occupancy comprises at least one of the following: none, a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0333] In some example embodiments, the first apparatus further comprises: means for transmitting, to the second apparatus, capability-related information indicating at leastone of: that the first apparatus supports CSI calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving a cell switch command, or the first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus.

[0334] In some example embodiments, the first maximum number is independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell, or the first maximum number is the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell.

[0335] In some example embodiments, the CSI-related information comprises at least one of the following: a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), or CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0336] In some example embodiments, the mobility configuration is a radio resource control signaling comprising Layerl / Layer2 triggered mobility (LTM) configuration or handover-related configuration.

[0337] In some example embodiments, the first apparatus comprises a terminal device and the second apparatus comprises a network device.

[0338] In some example embodiments, a second apparatus capable of performing any of the method 1200 (for example, the second apparatus 220 in FIG. 2 A and FIG. 2B) may comprise means for performing the respective operations of the method 1200. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. The second apparatus may be implemented as or included in the second apparatus 220 in FIG. 2 A and FIG. 2B.

[0339] In some example embodiments, the second apparatus comprises means for transmitting, to a first apparatus, a mobility configuration to the first apparatus, the mobility configuration indicating the following: a plurality of candidate cells, a plurality of RS resources for CSI acquisition, and at least one priority rule for CSI-related information acquisition; means for receiving, from the first apparatus, measurement results of the plurality of candidate cells; and means for transmitting, based on the measurement results, a cell switch command indicating a second cell from the plurality ofcandidate cells.

[0340] In some example embodiments, at least one priority rule comprises a priority order of the plurality of candidate cells or a priority order of the plurality of RS resource sets.

[0341] In some example embodiments, at least one priority rule for CSI-related information acquisition is associated with at least one of the following: whether there is at least one active transmission configuration indicator (TCI) state, whether a timing advance (TA) acquisition procedure has been performed or completed, whether an abstract syntax notation one (ASN.1) decoding procedure has been configured or completed, or a measurement result value.

[0342] In some example embodiments, the second apparatus further comprises: means for receiving, from the first apparatus, capability-related information indicating at least one of: that the first apparatus supports CSI calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving the cell switch command, or the first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus.

[0343] In some example embodiments, the first maximum number is independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell, or the first maximum number is the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell.

[0344] In some example embodiments, the CSI-related information comprises at least one of the following: a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), or CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0345] In some example embodiments, the mobility configuration is a radio resource control signaling comprising Layerl / Layer2 triggered mobility (LTM) configuration or handover-related configuration.

[0346] In some example embodiments, the first apparatus comprises a terminal device and the second apparatus comprises a network device.

[0347] In some example embodiments, a first apparatus capable of performing any of the methodl300 (for example, the first apparatus 210 in FIG. 2A and FIG. 2B) may comprise means for performing the respective operations of the methodl300. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. The first apparatus may be implemented as or included in the first apparatus 210 in FIG. 2 A and FIG. 2B.

[0348] In some example embodiments, the first apparatus comprises means for receiving, from a second apparatus providing a first cell serving the first apparatus, a mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition; means for receiving, from the second apparatus, a cell switch command indicating a second cell of the plurality of candidate cells; means for determining, based at least on CPU occupancy in the second cell and the mobility configuration, CSI-related information of the second cell; and means for transmitting, to a third apparatus providing the second cell, a measurement report comprising the CSI-related information of the second cell.

[0349] In some example embodiments, the measurement report occupies at least one CPU during at least one symbol based on at least one of a transmission of a RS resource corresponding to the second cell associated with the measurement report, a transmission of the cell switch command, a transmission of an acknowledgment of the cell switch command, a transmission of the measurement report, a reference uplink resource determined for the measurement report, a CSI reference resource corresponding to the reference uplink resource, or decoding and processing of a configuration of the second cell.

[0350] In some example embodiments, the at least one symbol starts at the first symbol of the earliest RS resource corresponding to the second cell associated with the measurement report, after receiving the cell switch command.

[0351] In some example embodiments, the at least one symbol starts at a first timing comprising at least one of the first or last symbol of the downlink resource carrying the cell switch command, or the first or last symbol of the uplink resource carrying an acknowledgment of the cell switch command.

[0352] In some example embodiments, the at least one symbol starts at the first symbol after the first apparatus completes decoding and processing of the configuration of the second cell.

[0353] In some example embodiments, the at least one symbol starts at the first symbol of the latest RS resource corresponding to the second cell, after receiving the cell switch command and no later than the CSI reference resource.

[0354] In some example embodiments, the at least one symbol is assumed to start being occupied upon a predefined event.

[0355] In some example embodiments, the at least one symbol ends at the first or last symbol of an uplink resource carrying the measurement report.

[0356] In some example embodiments, the at least one symbol ends at the Mthsymbol after the latest RS resource corresponding to the second cell after receiving the cell switch command, and no later than the CSI reference resource, and wherein M is an integer determined based on at least one of a capability of the first apparatus or mobility configuration.

[0357] In some example embodiments, the at least one symbol ends at the last symbol of the reference uplink resource, after receiving the cell switch command.

[0358] In some example embodiments, the CPU occupancy in the second cell is associated with at least one of the number of the plurality of RS resources for measurements to acquire CSI-related information, or the report quantities associated with a plurality of report configurations of the plurality of candidate cells.

[0359] In some example embodiments, the report quantities considered for determine the CPU occupancy comprises at least one of the following: none, a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0360] In some example embodiments, the first apparatus further comprises: means for transmitting, to the second apparatus, capability-related information indicating at least one of: the first apparatus supporting CSI calculation for acquiring the CSI-related information of a candidate cell after receiving the cell switch command, or a firstmaximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus.

[0361] In some example embodiments, the first maximum number is independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the second cell, or the first maximum number is the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the second cell.

[0362] In some example embodiments, the CSI-related information comprises at least one of the following: a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), a CSI-RS resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0363] In some example embodiments, the mobility configuration is a radio resource control signaling comprising Layerl / Layer2 triggered mobility (LTM) configuration or handover-related configuration.

[0364] In some example embodiments, the first apparatus comprises a terminal device and the second apparatus comprises a network device.

[0365] In some example embodiments, a second apparatus capable of performing any of the method 1400 (for example, the second apparatus 220 in FIG. 2 A and FIG. 2B) may comprise means for performing the respective operations of the method 1400. The means may be implemented in any suitable form. For example, the means may be implemented in a circuitry or software module. The second apparatus may be implemented as or included in the second apparatus 220 in FIG. 2 A and FIG. 2B.

[0366] In some example embodiments, the second apparatus comprises means for receiving, from a first apparatus, capability-related information indicating at least one of that the first apparatus supports CSI calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells after receiving the cell switch command, or a first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus; means for transmitting, based on the capability-related information, a mobility configuration to the first apparatus, the mobility configuration indicating a plurality of candidate cells and a plurality of RS resources for at least one candidate cell of the plurality of candidate cells for CSI-relatedinformation acquisition; means for receiving, from the first apparatus, measurement results of the plurality of candidate cells; and means for transmitting, based on the measurement results, a cell switch command indicating a second cell from the plurality of candidate cells.

[0367] In some example embodiments, the first maximum number is independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell, or the first maximum number is the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell.

[0368] In some example embodiments, the CPU occupancy in the second cell is associated with at least one of the number of the plurality of RS resources for measurements to acquire CSI-related information, or the report quantities associated with a plurality of report configurations of the plurality of candidate cells.

[0369] In some example embodiments, the report quantities considered for determine the CPU occupancy comprises at least one of the following: none, a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0370] In some example embodiments, the CSI-related information comprises at least one of the following: a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), or CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

[0371] In some example embodiments, the mobility configuration is a radio resource control signaling comprising Layerl / Layer2 triggered mobility (LTM) configuration or handover-related configuration.

[0372] In some example embodiments, the first apparatus comprises a terminal device and the second apparatus comprises a network device.

[0373] FIG. 15 is a simplified block diagram of a device 1500 that is suitable for implementing example embodiments of the present disclosure. The device 1500 may be provided to implement a communication device, for example, the terminal device 110 orthe network device 120 as shown in FIG. 2A and FIG. 2B. As shown, the device 1500 includes one or more processors 1510, one or more memories 1520 coupled to the processor 1510, and one or more communication modules 1540 coupled to the processor 1510.

[0374] The communication module 1540 is for bidirectional communications. The communication module 1540 has one or more communication interfaces to facilitate communication with one or more other modules or devices. The communication interfaces may represent any interface that is necessary for communication with other network elements. In some example embodiments, the communication module 1540 may include at least one antenna.

[0375] The processor 1510 may be of any type suitable to the local technical network and may include one or more of the following: general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs) and processors based on multicore processor architecture, as non-limiting examples. The device 1500 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.

[0376] The memory 1520 may include one or more non-volatile memories and one or more volatile memories. Examples of the non-volatile memories include, but are not limited to, a Read Only Memory (ROM) 1524, an electrically programmable read only memory (EPROM), a flash memory, a hard disk, a compact disc (CD), a digital video disk (DVD), an optical disk, a laser disk, and other magnetic storage and / or optical storage. Examples of the volatile memories include, but are not limited to, a random-access memory (RAM) 1522 and other volatile memories that will not last in the power-down duration.

[0377] A computer program 1530 includes computer executable instructions that are executed by the associated processor 1510. The instructions of the program 1530 may include instructions for performing operations / acts of some example embodiments of the present disclosure. The program 1530 may be stored in the memory, e.g., the ROM 1524. The processor 1510 may perform any suitable actions and processing by loading the program 1530 into the RAM 1522.

[0378] The example embodiments of the present disclosure may be implemented bymeans of the program 1530 so that the device 1500 may perform any process of the disclosure as discussed with reference to FIG. 2A to FIG. 14. The example embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.

[0379] In some example embodiments, the program 1530 may be tangibly contained in a computer readable medium which may be included in the device 1500 (such as in the memory 1520) or other storage devices that are accessible by the device 1500. The device 1500 may load the program 1530 from the computer readable medium to the RAM 1522 for execution. In some example embodiments, the computer readable medium may include any types of non-transitory storage medium, such as ROM, EPROM, a flash memory, a hard disk, CD, DVD, and the like. The term “non-transitory,” as used herein, is a limitation of the medium itself (i.e., tangible, not a signal) as opposed to a limitation on data storage persistency (e.g., RAM vs. ROM).

[0380] FIG. 16 shows an example of the computer readable medium 1600 which may be in form of CD, DVD or other optical storage disk. The computer readable medium 1600 has the program 1530 stored thereon.

[0381] 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, and other aspects may be implemented in firmware or software which may be executed by a controller, microprocessor or other computing device. Although various aspects of embodiments of the present disclosure are illustrated and described as block diagrams, flowcharts, or using some other pictorial representations, it is to be understood that the block, apparatus, system, technique or method 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.

[0382] Some example embodiments of the present disclosure also provide at least one computer program product tangibly stored on a computer readable medium, such as a non-transitory computer readable medium. The computer program product includes computerexecutable instructions, such as those included in program modules, being executed in a device on a target physical or virtual processor, to carry out any of the methods asdescribed above. 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.

[0383] Program code for carrying out methods of the present disclosure may be written in any combination of one or more programming languages. The program code 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 code, 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.

[0384] In the context of the present disclosure, the computer program code or related data may be carried by any suitable carrier to enable the device, apparatus or processor to perform various processes and operations as described above. Examples of the carrier include a signal, computer readable medium, and the like.

[0385] The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer 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 computer 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.

[0386] Further, although operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shownor 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, although 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. Unless explicitly stated, certain features that are described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, unless explicitly stated, various features that are described in the context of a single embodiment may also be implemented in a plurality of embodiments separately or in any suitable sub-combination.

[0387] Although the present disclosure has been described in languages 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. I / We Claim:

1. A first apparatus comprising:at least one processor; andat least one memory storing instructions that, when executed by the at least one processor, cause the first apparatus to:receive, from a second apparatus providing a first cell serving the first apparatus, a mobility configuration indicating a plurality of candidate cells and a plurality of reference signal (RS) resources for at least one candidate cell of the plurality of candidate cells for channel state information (CSI)-related information acquisition;determine, based at least on CSI processing unit (CPU) occupancy in the first cell and the mobility configuration, CSI-related information of at least one candidate cell of the plurality of candidate cells, the at least one candidate cell comprising a second cell;receive, from the second apparatus, a cell switch command indicating the second cell; andtransmit, to a third apparatus providing the second cell, a measurement report comprising CSI-related information of the second cell.

2. The first apparatus of claim 1, wherein the measurement report occupies at least one CPU during at least one symbol based on at least one of:a transmission of a RS resource corresponding to the second cell associated with the measurement report,a transmission of the mobility configuration,a transmission of an acknowledgment of the mobility configuration,a transmission of an activation command associated with the transmission of the RS resource associated with the measurement report,a transmission of an acknowledgment of the activation command,a transmission of a control command comprising mobility information related to the second cell,a transmission of an acknowledgment of the control command,a transmission of the cell switch command,a transmission of an acknowledgment of the cell switch command,a reference uplink resource determined for the measurement report, ora CSI reference resource corresponding to the reference uplink resource.

3. The first apparatus of claim 2, wherein the motility information relates to at least one of the following:activation of a measurement for the measurement report,transmission configuration indicator (TCI) state activation of at least one TCI state of the second cell, orrandom access channel (RACH) procedure on the second cell.

4. The first apparatus of claim 2, wherein the at least one symbol starts at a first timing comprising at least one ofthe first symbol of the earliest RS resource corresponding to the second cell associated with the measurement report, after receiving the mobility configuration and no later than a downlink resource carrying the cell switch command,the first symbol of the earliest RS resource corresponding to the second cell associated with the measurement report, after receiving an activation command associated with the transmission of the RS resource and no later than a downlink resource carrying the cell switch command,the first symbol of the earliest RS resource corresponding to the second cell, after transmitting an acknowledgment of the mobility configuration and no later than the downlink resource carrying the cell switch command, orthe first symbol of the earliest RS resource corresponding to the second cell, after transmitting an acknowledgment of the activation command and no later than the downlink resource carrying the cell switch command.

5. The first apparatus of claim 2, wherein the at least one symbol starts at a first timing comprising at least one ofthe first or last symbol of a downlink resource carrying the mobility configuration, the first or last symbol of an uplink resource carrying the acknowledgment of the mobility configuration.

6. The first apparatus of claim 2, wherein the at least one symbol starts at a first timing comprising at least one ofthe first or last symbol of a downlink resource carrying the control command comprisingmobility information related to the second cell, orthe first or last symbol of an uplink resource carrying the acknowledgment of the control command.

7. The first apparatus of claim 2, wherein the at least one symbol starts at the first symbol of the latest RS resource corresponding to the second cell, no later than the CSI reference resource and the downlink resource carrying the cell switch command.

8. The first apparatus of any of claims 2 to 7, wherein the at least one symbol ends at a second timing comprising at least one of:the first or last symbol of the downlink resource carrying the control command comprising the cell switch command, orthe first or last symbol of an uplink resource carrying the acknowledgment of the cell switch command.

9. The first apparatus of any of claims 2 to 7, wherein the at least one symbol ends at a last symbol of the reference uplink resource and no later than the downlink resource carrying the cell switch command.

10. The first apparatus of any of claims 2 to 7, wherein the at least one symbol ends at the N111symbol after the latest RS resource corresponding to the second cell, and no later than the downlink resource carrying the cell switch command, and wherein N is an integer determined based on at least one of a capability of the first apparatus or mobility configuration.

11. The fist apparatus of any of claims 1 to 10, wherein the CPU occupancy in the first cell is associated with at least one of:the number of the plurality of candidate cells configured for measurements to acquire CSI-related information,the number of RS resources configured for measurements to acquire CSI-related information, orthe report quantities associated with a plurality of report configurations of the plurality of candidate cells.

12. The first apparatus of claim 11, wherein the report quantities considered for determine the CPU occupancy comprises at least one of the following: none, a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

13. The first apparatus of any of claims 1 to 12, wherein the first apparatus is caused to: transmit, to the second apparatus, capability-related information indicating at least one of:that the first apparatus supports CSI calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving the cell switch command, ora first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus.

14. The first apparatus of claim 13, wherein,the first maximum number is independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell, or the first maximum number is the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell.

15. The first apparatus of any of claims 1 to 14, wherein the CSI-related information comprises at least one of the following: a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), or CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

16. The first apparatus of any of claims 1 to 15, wherein the mobility configuration is a radio resource control signaling comprising Layerl / Layer2 triggered mobility (LTM) configuration or handover-related configuration.

17. The first apparatus of any of claims 1 to 16, wherein the first apparatus comprises a terminal device and the second apparatus comprises a network device.

18. A second apparatus comprising:at least one processor; andat least one memory storing instructions that, when executed by the at least one processor, cause the second apparatus to:receive, from a first apparatus, capability-related information indicating at least one of:that the first apparatus supports channel state information (CSI) calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving the cell switch command, ora first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus;transmit, based on the capability -related information, a mobility configuration to the first apparatus, the mobility configuration indicating a plurality of candidate cells and a plurality of reference signal (RS) resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition;receive, from the first apparatus, measurement results of the plurality of candidate cells; andtransmit, based on the measurement results, a cell switch command indicating a second cell from the plurality of candidate cells.

19. The second apparatus of claim 18, wherein,the first maximum number is independent from a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell, or the first maximum number is the same as a second maximum number of simultaneous CSI calculations for layer 1 measurement and reporting in the first cell.

20. The second apparatus of claim 18 or 19, wherein the CSI-related information comprises at least one of the following: a rank indication (RI), a precoding matrix indicator (PMI), a channel quality indicator (CQI), or CSI-reference signal (RS) resource indicator (CRI), a layer indicator (LI), or a reference signal receiving power (RSRP).

21. The second apparatus of any of claims 18 to 20, wherein the mobility configuration is a radio resource control signaling comprising Layerl / Layer2 triggered mobility (LTM)configuration or handover-related configuration.

22. The second apparatus of any of claim 18 to 21, wherein the first apparatus comprises a terminal device and the second apparatus comprises a network device.

23. A method comprising:receiving, from a second apparatus providing a first cell serving the first apparatus, a mobility configuration indicating a plurality of candidate cells and a plurality of reference signal (RS) resources for at least one candidate cell of the plurality of candidate cells for channel state information (CSI)-related information acquisition;determining, based at least on CSI processing unit (CPU) occupancy in the first cell and the mobility configuration, CSI-related information of at least one candidate cell of the plurality of candidate cells, the at least one candidate cell comprising a second cell;receiving, from the second apparatus, a cell switch command indicating the second cell; andtransmitting, to a third apparatus providing the second cell, a measurement report comprising CSI-related information of the second cell.

24. A method comprising:receiving, from a first apparatus, capability-related information indicating at least one of:that the first apparatus supports channel state information (CSI) calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving the cell switch command, ora first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus;transmitting, based on the capability -related information, a mobility configuration to the first apparatus, the mobility configuration indicating a plurality of candidate cells and a plurality of reference signal (RS) resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition;receiving, from the first apparatus, measurement results of the plurality of candidate cells; andtransmitting, based on the measurement results, a cell switch command indicating asecond cell from the plurality of candidate cells.

25. A first apparatus comprising:means for receiving, from a second apparatus providing a first cell serving the first apparatus, a mobility configuration indicating a plurality of candidate cells and a plurality of reference signal (RS) resources for at least one candidate cell of the plurality of candidate cells for channel state information (CSI)-related information acquisition;means for determining, based at least on CSI processing unit (CPU) occupancy in the first cell and the mobility configuration, CSI-related information of at least one candidate cell of the plurality of candidate cells, the at least one candidate cell comprising a second cell; means for receiving, from the second apparatus, a cell switch command indicating the second cell; andmeans for transmitting, to a third apparatus providing the second cell, a measurement report comprising CSI-related information of the second cell.

26. A second apparatus comprising:means for receiving, from a first apparatus, capability-related information indicating at least one of:that the first apparatus supports channel state information (CSI) calculation for acquiring the CSI-related information of at least one candidate cell of the plurality of candidate cells prior to receiving the cell switch command, ora first maximum number of simultaneous CSI calculations for CSI-related information acquisition supported by the first apparatus;means for transmitting, based on the capability-related information, a mobility configuration to the first apparatus, the mobility configuration indicating a plurality of candidate cells and a plurality of reference signal (RS) resources for at least one candidate cell of the plurality of candidate cells for CSI-related information acquisition;means for receiving, from the first apparatus, measurement results of the plurality of candidate cells; andmeans for transmitting, based on the measurement results, a cell switch command indicating a second cell from the plurality of candidate cells.

27. A computer readable medium comprising instructions stored thereon for causing anapparatus at least to perform the method of claim 23 or the method of claim 24.

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