Method and device for receiving and transmitting information

Abstract

The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. The disclosure provides a method performed by a UE in a wireless communication system, the method includes receiving a first CSI reporting configuration and a second CSI reporting configuration for LTM, where the first CSI reporting configuration includes configuration information for a resource set, the configuration information for the resource set indicates K CSI-RS resource IDs and K LTM candidate configuration IDs, the first CSI reporting configuration further includes first configuration information of L candidate cells, L is equal to the number of LTM candidate configuration IDs after duplicated IDs of the K LTM candidate configuration IDs being removed; reporting CSI of N candidate cells of the L candidate cells based on the first CSI reporting configuration, or determining whether to report the CSI report corresponding to the first CSI reporting configuration based on the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration, or dropping the CSI report corresponding to the first CSI reporting configuration when the L candidate cells are a current special cell.

Description

METHOD AND DEVICE FOR RECEIVING AND TRANSMITTING INFORMATION

[0001] The present application relates to the technical field of wireless communication, and more specifically, to a method and device for receiving and transmitting information.

[0002] In order to meet the increasing demand for wireless data communication services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also called "Beyond 4G networks" or "Post-LTE systems".

[0003] In order to achieve a higher data rate, 5G communication systems are implemented in higher frequency (millimeter, mmWave) bands, e.g., 60 GHz bands. In order to reduce propagation loss of radio waves and increase a transmission distance, technologies such as beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antenna, analog beamforming and large-scale antenna are discussed in 5G communication systems.

[0004] In addition, in 5G communication systems, developments of system network improvement are underway based on advanced small cell, cloud radio access network (RAN), ultra-dense network, device-to-device (D2D) communication, wireless backhaul, mobile network, cooperative communication, coordinated multi-points (CoMP), reception-end interference cancellation, etc.

[0005] In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coding modulation (ACM), and filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have been developed.

[0006] 5thgeneration (5G) mobile communication technologies define broad frequency bands such that high transmission rates and new services are possible, and can be implemented not only in "Sub 6GHz" bands such as 3.5GHz, but also in "Above 6GHz" bands referred to as mmWave including 28GHz and 39GHz. In addition, it has been considered to implement 6G mobile communication technologies (referred to as Beyond 5G systems) in terahertz bands (for example, 95GHz to 3THz bands) in order to accomplish transmission rates fifty times faster than 5G mobile communication technologies and ultra-low latencies one-tenth of 5G mobile communication technologies.

[0007] At the beginning of the development of 5G mobile communication technologies, in order to support services and to satisfy performance requirements in connection with enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communications (URLLC), and massive Machine-Type Communications (mMTC), there has been ongoing standardization regarding beamforming and massive MIMO for mitigating radio-wave path loss and increasing radio-wave transmission distances in mmWave, supporting numerologies (for example, operating multiple subcarrier spacings) for efficiently utilizing mmWave resources and dynamic operation of slot formats, initial access technologies for supporting multi-beam transmission and broadbands, definition and operation of BWP (BandWidth Part), new channel coding methods such as a LDPC (Low Density Parity Check) code for large amount of data transmission and a polar code for highly reliable transmission of control information, L2 pre-processing, and network slicing for providing a dedicated network specialized to a specific service.

[0008] Currently, there are ongoing discussions regarding improvement and performance enhancement of initial 5G mobile communication technologies in view of services to be supported by 5G mobile communication technologies, and there has been physical layer standardization regarding technologies such as V2X (Vehicle-to-everything) for aiding driving determination by autonomous vehicles based on information regarding positions and states of vehicles transmitted by the vehicles and for enhancing user convenience, NR-U (New Radio Unlicensed) aimed at system operations conforming to various regulation-related requirements in unlicensed bands, NR UE Power Saving, Non-Terrestrial Network (NTN) which is UE-satellite direct communication for providing coverage in an area in which communication with terrestrial networks is unavailable, and positioning.

[0009] Moreover, there has been ongoing standardization in air interface architecture / protocol regarding technologies such as Industrial Internet of Things (IIoT) for supporting new services through interworking and convergence with other industries, IAB (Integrated Access and Backhaul) for providing a node for network service area expansion by supporting a wireless backhaul link and an access link in an integrated manner, mobility enhancement including conditional handover and DAPS (Dual Active Protocol Stack) handover, and two-step random access for simplifying random access procedures (2-step RACH for NR). There also has been ongoing standardization in system architecture / service regarding a 5G baseline architecture (for example, service based architecture or service based interface) for combining Network Functions Virtualization (NFV) and Software-Defined Networking (SDN) technologies, and Mobile Edge Computing (MEC) for receiving services based on UE positions.

[0010] As 5G mobile communication systems are commercialized, connected devices that have been exponentially increasing will be connected to communication networks, and it is accordingly expected that enhanced functions and performances of 5G mobile communication systems and integrated operations of connected devices will be necessary. To this end, new research is scheduled in connection with eXtended Reality (XR) for efficiently supporting AR (Augmented Reality), VR (Virtual Reality), MR (Mixed Reality) and the like, 5G performance improvement and complexity reduction by utilizing Artificial Intelligence (AI) and Machine Learning (ML), AI service support, metaverse service support, and drone communication.

[0011] Furthermore, such development of 5G mobile communication systems will serve as a basis for developing not only new waveforms for providing coverage in terahertz bands of 6G mobile communication technologies, multi-antenna transmission technologies such as Full Dimensional MIMO (FD-MIMO), array antennas and large-scale antennas, metamaterial-based lenses and antennas for improving coverage of terahertz band signals, high-dimensional space multiplexing technology using OAM (Orbital Angular Momentum), and RIS (Reconfigurable Intelligent Surface), but also full-duplex technology for increasing frequency efficiency of 6G mobile communication technologies and improving system networks, AI-based communication technology for implementing system optimization by utilizing satellites and AI (Artificial Intelligence) from the design stage and internalizing end-to-end AI support functions, and next-generation distributed computing technology for implementing services at levels of complexity exceeding the limit of UE operation capability by utilizing ultra-high-performance communication and computing resources.

[0012] The above information is presented as background information only to assist with an understanding of the disclosure. No determination has been made, and no assertion is made, as to whether any of the above might be applicable as prior art with regard to the disclosure.

[0013] In order to enhance the scheduling efficiency of the 5G wireless communication system, a base station needs to obtain channel state information (CSI) in order to schedule accordingly based on the CSI fed back by a terminal device. However, how to further enhance the performance associated with the CSI report is a problem to be solved.

[0014] The technical objects to be achieved by various embodiments of the disclosure are not limited to the technical objects mentioned above, and other technical objects not mentioned may be considered by those skilled in the art from various embodiments of the disclosure to be described below.

[0015] An aspect of the disclosure provides a method performed by a user equipment (UE) in a wireless communication system, the method includes receiving a first channel state information (CSI) reporting configuration and a second CSI reporting configuration for Layer 1 / Layer 2 triggered mobility (LTM), where the first CSI reporting configuration includes configuration information of a resource set for channel measurement, the configuration information of the resource set for channel measurement indicates K CSI reference signal (CSI-RS) resource identifiers (IDs) and K LTM candidate configuration IDs, K≥1, where the k-th CSI-RS resource ID of the K CSI-RS resource IDs is associated with the k-th LTM candidate configuration ID of the K LTM candidate configuration IDs, 1≤k≤K, the first CSI reporting configuration further includes first configuration information of L candidate cells, where each of L first configuration information indicates at least one of a codebook parameter, a port indication for non-precoding matrix indicator (PMI) feedback, and a frequency domain configuration parameter, and L is equal to the number of LTM candidate configuration IDs after duplicated IDs of the K LTM candidate configuration IDs being removed, the LTM candidate configuration ID of the i-th candidate cell of the L candidate cells is the i-th LTM candidate configuration ID after the duplicated IDs of the K LTM candidate configuration IDs being removed, where 1≤i≤L; reporting CSI of N candidate cells of the L candidate cells based on the first CSI reporting configuration, 1≤N≤L, or determining whether to report the CSI report corresponding to the first CSI reporting configuration based on the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration, or dropping the CSI report corresponding to the first CSI reporting configuration when the L candidate cells are a current special cell; where the N candidate cells are determined based on at least one of the followings: values of channel quality indicators (CQIs) of the L candidate cells; the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration; whether the N candidate cells exclude the current special cell.

[0016] In an example, the j-th LTM candidate configuration ID of the L LTM candidate configuration IDs after the duplicated IDs of the K LTM candidate configuration IDs being removed is smaller than the (j+1)-th LTM candidate configuration ID, where 1≤j≤L-1.

[0017] In an example, the CSI-RS resource corresponding to the i-th candidate cell of the L candidate cells is determined based on the LTM candidate configuration ID of the i-th candidate cell.

[0018] In an example, the CSI-RS resource corresponding to the i-th candidate cell of the L candidate cells is one or more CSI-RS resources of the K CSI-RS resources with associated LTM candidate configuration ID being the same as the LTM candidate configuration ID of the i-th candidate cell.

[0019] In an example, N is determined by at least one of the followings: N is indicated by the first CSI reporting configuration; N is indicated by a trigger state corresponding to the first CSI reporting configuration indicated by media access control control element (MAC-CE) or downlink control information (DCI); N is determined by the UE.

[0020] In an example, the CSI report corresponding to the second CSI reporting configuration further includes Layer 1-reference signal received power (L1-RSRP) corresponding to the resource indicator and the CSI report corresponding to the second CSI reporting configuration is the latest CSI report before the report carrying CSI of the N candidate cells of the L candidate cells.

[0021] In an example, the method further includes when the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration is different from the L candidate cells, dropping the report carrying the CSI of the N candidate cells of the L candidate cells.

[0022] In an example, the method further includes when the L candidate cells are the current special cell and the CSI report corresponding to the first CSI reporting configuration is periodic CSI report, dropping the CSI report corresponding to the first CSI reporting configuration.

[0023] In an example, whether the N candidate cells excluding the current special cell is indicated by the first CSI reporting configuration, and where when the N candidate cells exclude the current special cell, the N candidate cells are N candidate cells of L-1 cells of the L candidate cells not corresponding to the current special cell.

[0024] In an example, the CSI of each of the N candidate cells includes Krep groups of CSI, where each of the Krep groups of CSI includes at least one of CSI-RS resource indicator CRI, PMI, rank indicator RI, CQI, layer indicator LI, and where Krep=1, and / or Krep is indicated by the first configuration information corresponding to each candidate cell, and / or Krep is indicated by the first CSI reporting configuration.

[0025] In an example, the CSI-RS resource corresponding to the Krep groups of CSI are determined based on at least one of the followings: the value of the CQI corresponding to the CSI-RS resource; the resource corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration.

[0026] In an example, when the N candidate cells do not exclude the current special cell: when N=L and / or K1>1, the value k1 of the CRI in the CSI of the n-th candidate cell of the N candidate cells corresponds to the (k1+1)-th CSI-RS resource corresponding to the n-th candidate cell, 0≤k1≤K1-1, 11≤n≤N; or when N=L and / or K1=1, no CRI is included in the CSI of the N candidate cells; or when N<L, the value k2 of the CRI in the CSI of the N candidate cells corresponds to the (k2+1)-th CSI-RS resource in the resource set configured by the configuration information of the resource set for channel measurement, 0≤k2≤K-1, where K1 is the number of the CSI-RS resources corresponding to the n-th candidate cell.

[0027] In an example, when the N candidate cells exclude the current special cell: when N=L and / or K1>1, the value k1 of the CRI in the CSI of the N-th candidate cell of the N candidate cells corresponds to the (k1+1)-th CSI-RS resource corresponding to the n-th candidate cell, 0≤k1≤K1-1, 1≤n≤N; or when N=L-1 and / or K1=1, no CRI is included in the CSI of the N candidate cells; or when N<L-1, the value k2 of the CRI in the CSI of the N candidate cells corresponds to the (k2+1)-th CSI-RS resource in the resource set configured by the configuration information of the resource set for channel measurement, 0≤k2≤K-1, where K1 is the number of the CSI-RS resources corresponding to the n-th candidate cell.

[0028] In an example, the mapping order of the CSI of the N candidate cells is determined based on the values of LTM candidate configuration IDs corresponding to the N candidate cells and / or whether the candidate cells are the current special cell.

[0029] In an example, if the N candidate cells include the candidate cell corresponding to the current special cell, the CSI of the candidate cell of the N candidate cells not corresponding to the current special cell is before the CSI of the candidate cell of the N candidate cell corresponding to the current special cell, and the mapping order of the CSI of the candidate cell of the N candidate cells not corresponding to the current special cell is determined based on the ascending order of the values of the LTM candidate configuration IDs corresponding to the N candidate cells; or if the N candidate cells do not include the candidate cell corresponding to the current special cell, the mapping order of the CSI of the N candidate cells is determined based on the ascending order of the values of the LTM candidate configuration IDs corresponding to the N candidate cells.

[0030] In an example, CSI omission of the N candidate cells is performed at candidate cell level, and where priorities of the CSI of the N candidate cells are determined based on the values of the LTM candidate configuration IDs corresponding to the N candidate cells and / or whether the candidate cells are the current special cell.

[0031] In an example, if the N candidate cells include the candidate cell corresponding to the current special cell, the priority of the CSI of the candidate cell of the N candidate cell corresponding to the current special cell is lower than the priority of the CSI of the candidate cell of the N candidate cells corresponding to the non-current special cell, and the priority of the CSI of the candidate cell of the N candidate cells not corresponding to the current special cell is determined based on the ascending order of the values of the LTM candidate configuration IDs corresponding to the N candidate cells; or if the N candidate cells do not include candidate cell corresponding to the current special cell, the priorities of the CSI of the N candidate cells are determined based on the ascending order of the values of the LTM candidate configuration IDs corresponding to the N candidate cells.

[0032] In an example, the number of CSI processing units (CPU) occupied by the CSI report corresponding to the first CSI reporting configuration is the summation of the number of reference signal resources corresponding to each of the N candidate cells.

[0033] Another aspect of the disclosure provides a method performed by a base station in a wireless communication system, the method includes transmitting a first channel state information (CSI) reporting configuration and a second CSI reporting configuration for Layer 1 / Layer 2 triggered mobility (LTM), where the first CSI reporting configuration includes configuration information of a resource set for channel measurement, the configuration information of the resource set for channel measurement indicates K CSI reference signal (CSI-RS) resource identifiers (IDs) and K LTM candidate configuration IDs, K≥1, where the k-th CSI-RS resource ID of the K CSI-RS resource IDs is associated with the k-th LTM candidate configuration ID of the K LTM candidate configuration IDs, 1≤k≤K, the first CSI reporting configuration further includes first configuration information of L candidate cells, where each of L first configuration information indicates at least one of a codebook parameter, a port indication for non-precoding matrix indicator (PMI) feedback, and a frequency domain configuration parameter, and L is equal to a number of LTM candidate configuration IDs after duplicated IDs of the K LTM candidate configuration IDs being removed, the LTM candidate configuration ID of the i-th candidate cell of the L candidate cells is the i-th LTM candidate configuration ID after the duplicated IDs of the K LTM candidate configuration IDs being removed, where 1≤i≤L; receiving CSI report of N candidate cells of the L candidate cells based on the first CSI reporting configuration, 1≤N≤L; where the N candidate cells are determined based on at least one of the followings: values of channel quality indicators (CQIs) of the L candidate cells; the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration; whether the N candidate cells exclude the current special cell.

[0034] In an example, the j-th LTM candidate configuration ID of the L LTM candidate configuration IDs after the duplicated IDs of the K LTM candidate configuration IDs being removed is smaller than the (j+1)-th LTM candidate configuration ID, where 1≤j≤L-1.

[0035] In an example, the CSI-RS resource corresponding to the i-th candidate cell of the L candidate cells is determined based on the LTM candidate configuration ID of the i-th candidate cell.

[0036] In an example, the CSI-RS resource corresponding to the i-th candidate cell of the L candidate cells is one or more CSI-RS resources of the K CSI-RS resources with associated LTM candidate configuration ID being the same as the LTM candidate configuration ID of the i-th candidate cell.

[0037] In an example, N is determined by at least one of the followings: N is indicated by the first CSI reporting configuration; N is indicated by a trigger state corresponding to the first CSI reporting configuration indicated by media access control control element (MAC-CE) or downlink control information (DCI); N is determined by the UE.

[0038] In an example, the CSI report corresponding to the second CSI reporting configuration further includes Layer 1-reference signal received power (L1-RSRP) corresponding to the resource indicator and the CSI report corresponding to the second CSI reporting configuration is the latest CSI report before the report carrying CSI of the N candidate cells of the L candidate cells.

[0039] In an example, wherein when the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration is different from the L candidate cells, the report carrying the CSI of the N candidate cells of the L candidate cells is dropped.

[0040] In an example, wherein when the L candidate cells are the current special cell and the CSI report corresponding to the first CSI reporting configuration is periodic CSI report, the CSI report corresponding to the first CSI reporting configuration is dropped.

[0041] In an example, whether the N candidate cells excluding the current special cell is indicated by the first CSI reporting configuration, and where when the N candidate cells exclude the current special cell, the N candidate cells are N candidate cells of L-1 cells of the L candidate cells not corresponding to the current special cell.

[0042] In an example, the CSI of each of the N candidate cells includes Krep groups of CSI, where each of the Krep groups of CSI includes at least one of CSI-RS resource indicator CRI, PMI, rank indicator RI, CQI, layer indicator LI, and where Krep=1, and / or Krep is indicated by the first configuration information corresponding to each candidate cell, and / or Krep is indicated by the first CSI reporting configuration.

[0043] In an example, the CSI-RS resource corresponding to the Krep groups of CSI are determined based on at least one of the followings: the value of the CQI corresponding to the CSI-RS resource; the resource corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration.

[0044] In an example, when the N candidate cells do not exclude the current special cell: when N=L and / or K1>1, the value k1 of the CRI in the CSI of the n-th candidate cell of the N candidate cells corresponds to the (k1+1)-th CSI-RS resource corresponding to the n-th candidate cell, 0≤k1≤K1-1, 11≤n≤N; or when N=L and / or K1=1, no CRI is included in the CSI of the N candidate cells; or when N<L, the value k2 of the CRI in the CSI of the N candidate cells corresponds to the (k2+1)-th CSI-RS resource in the resource set configured by the configuration information of the resource set for channel measurement, 0≤k2≤K-1, where K1 is the number of the CSI-RS resources corresponding to the n-th candidate cell.

[0045] In an example, when the N candidate cells exclude the current special cell: when N=L and / or K1>1, the value k1 of the CRI in the CSI of the N-th candidate cell of the N candidate cells corresponds to the (k1+1)-th CSI-RS resource corresponding to the n-th candidate cell, 0≤k1≤K1-1, 1≤n≤N; or when N=L-1 and / or K1=1, no CRI is included in the CSI of the N candidate cells; or when N<L-1, the value k2 of the CRI in the CSI of the N candidate cells corresponds to the (k2+1)-th CSI-RS resource in the resource set configured by the configuration information of the resource set for channel measurement, 0≤k2≤K-1, where K1 is the number of the CSI-RS resources corresponding to the n-th candidate cell.

[0046] In an example, the mapping order of the CSI of the N candidate cells is determined based on the values of LTM candidate configuration IDs corresponding to the N candidate cells and / or whether the candidate cells are the current special cell.

[0047] In an example, if the N candidate cells include the candidate cell corresponding to the current special cell, the CSI of the candidate cell of the N candidate cells not corresponding to the current special cell is before the CSI of the candidate cell of the N candidate cell corresponding to the current special cell, and the mapping order of the CSI of the candidate cell of the N candidate cells not corresponding to the current special cell is determined based on the ascending order of the values of the LTM candidate configuration IDs corresponding to the N candidate cells; or if the N candidate cells do not include the candidate cell corresponding to the current special cell, the mapping order of the CSI of the N candidate cells is determined based on the ascending order of the values of the LTM candidate configuration IDs corresponding to the N candidate cells.

[0048] In an example, CSI omission of the N candidate cells is performed at candidate cell level, and where priorities of the CSI of the N candidate cells are determined based on the values of the LTM candidate configuration IDs corresponding to the N candidate cells and / or whether the candidate cells are the current special cell.

[0049] In an example, if the N candidate cells include the candidate cell corresponding to the current special cell, the priority of the CSI of the candidate cell of the N candidate cell corresponding to the current special cell is lower than the priority of the CSI of the candidate cell of the N candidate cells corresponding to the non-current special cell, and the priority of the CSI of the candidate cell of the N candidate cells not corresponding to the current special cell is determined based on the ascending order of the values of the LTM candidate configuration IDs corresponding to the N candidate cells; or if the N candidate cells do not include candidate cell corresponding to the current special cell, the priorities of the CSI of the N candidate cells are determined based on the ascending order of the values of the LTM candidate configuration IDs corresponding to the N candidate cells.

[0050] In an example, the number of CSI processing units (CPU) occupied by the CSI report corresponding to the first CSI reporting configuration is the summation of the number of reference signal resources corresponding to each of the N candidate cells.

[0051] Another aspect of the disclosure provides a user equipment including a transceiver; and a controller coupled with the transceiver and configured to perform the above methods which may be performed by the user equipment.

[0052] Yet another aspect of the disclosure provides a base station including a transceiver; and a controller coupled with the transceiver and configured to perform the above methods which may be performed by the controller.

[0053] The above-described various embodiments of the disclosure are merely some of the preferred embodiments of the disclosure, and various embodiments reflecting the technical features of the disclosure may be derived and understood by those skilled in the art based on the following detailed description of the disclosure.

[0054]

[0055] The method provided by the application improves the performance of CSI, thereby improving the scheduling efficiency of the communication system.

[0056] The effects that can be achieved through the disclosure are not limited to the effects mentioned in the various embodiments, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

[0057] The above and other aspects, features, and advantages of the disclosure will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.

[0058] FIG. 1 illustrates an overall structure of an example wireless communication network according to various embodiments of the disclosure;

[0059] FIG. 2a illustrates a transmission path 200 in a wireless communication network according to various embodiments of the disclosure;

[0060] FIG. 2b illustrates a reception path 250 in a wireless communication network according to various embodiments of the disclosure;

[0061] FIG. 3a illustrates a structure of a user equipment (UE) in a wireless communication network according to various embodiments of the disclosure;

[0062] FIG. 3b illustrates a structure of a base station in a wireless communication network according to various embodiments of the disclosure;

[0063] FIG. 4 illustrates a method 400 performed by a user equipment (UE) according to various embodiments of the disclosure;

[0064] FIG. 5 illustrates a method 500 performed by a base station according to various embodiments of the disclosure;

[0065] FIG. 6 illustrates a structure 600 of a user equipment according to various embodiments of the disclosure;

[0066] FIG. 7 illustrates a structure 700 of a base station according to various embodiments of the disclosure.

[0067] The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of various embodiments of the disclosure as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the disclosure. In addition, descriptions of well-known functions and constructions may be omitted for clarity and conciseness.

[0068] The terms and words used in the following description and claims are not limited to the bibliographical meanings, but, are merely used by the inventor to enable a clear and consistent understanding of the disclosure. Accordingly, it should be apparent to those skilled in the art that the following description of various embodiments of the disclosure is provided for illustration purpose only and not for the purpose of limiting the disclosure as defined by the appended claims and their equivalents.

[0069] It is to be understood that the singular forms “a”, “an” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “a component surface” includes reference to one or more of such surfaces.

[0070] The term “include” or “may include” refers to the existence of a corresponding disclosed function, operation or component which can be used in various embodiments of the disclosure and does not limit one or more additional functions, operations, or components. The terms such as “include” and / or “have” may be construed to denote a certain characteristic, number, step, operation, constituent element, component or a combination thereof, but may not be construed to exclude the existence of or a possibility of addition of one or more other characteristics, numbers, steps, operations, constituent elements, components or combinations thereof.

[0071] The term “or” used in various embodiments of the disclosure includes any or all of combinations of listed words. For example, the expression “A or B” may include A, may include B, or may include both A and B.

[0072] Unless defined differently, all terms used herein, which include technical terminologies or scientific terminologies, have the same meaning as that understood by a person skilled in the art to which the disclosure belongs. Such terms as those defined in a generally used dictionary are to be interpreted to have the meanings equal to the contextual meanings in the relevant field of art, and are not to be interpreted to have ideal or excessively formal meanings unless clearly defined in the disclosure.

[0073] The various embodiments of the disclosure can be applied to various communication systems, such as: global system for mobile communications (GSM) system, code division multiple access (CDMA) system, broadband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system Frequency division duplex (FDD) systems, time division duplex (TDD) systems, universal mobile telecommunications systems (UMTS), global interoperability for microwave access (WiMAX) communication systems, fifth generation (5G) systems or new wireless (NR) systems, etc. In addition, the various embodiments of the disclosure can be applied to future oriented communication technologies.

[0074] FIG. 1 illustrates an example wireless network100 according to various embodiments of the disclosure. The embodiment of the wireless network100 shown in FIG. 1 is for illustration only. Other embodiments of the wireless network100 can be used without departing from the scope of the disclosure.

[0075] The wireless network100 includes a gNodeB (gNB) 101, a gNB 102, and a gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one Internet Protocol (IP) network130, such as the Internet, a private IP network, or other data networks.

[0076] Depending on a type of the network, other well-known terms such as “base station” or “access point” can be used instead of “gNodeB” or “gNB”. For convenience, the terms “gNodeB” and “gNB” are used in this patent document to refer to network infrastructure components that provide wireless access for remote terminals. And, depending on the type of the network, other well-known terms such as “mobile station”, “user station”, “remote terminal”, “wireless terminal” or “user apparatus” can be used instead of “user equipment” or “UE”. For convenience, the terms “user equipment” and “UE” are used in this patent document to refer to remote wireless devices that wirelessly access the gNB, no matter whether the UE is a mobile device (such as a mobile phone or a smart phone) or a fixed device (such as a desktop computer or a vending machine).

[0077] gNB 102 provides wireless broadband access to the network130 for a first plurality of User Equipments (UEs) within a coverage area 120 of gNB 102. The first plurality of UEs include a UE 111, which may be located in a Small Business (SB); a UE 112, which may be located in an enterprise (E); a UE 113, which may be located in a WiFi Hotspot (HS); a UE 114, which may be located in a first residence (R); a UE 115, which may be located in a second residence (R); a UE 116, which may be a mobile device (M), such as a cellular phone, a wireless laptop computer, a wireless PDA, etc. GNB 103 provides wireless broadband access to network130 for a second plurality of UEs within a coverage area 125 of gNB 103. The second plurality of UEs include a UE 115 and a UE 116. In some embodiments, one or more of gNBs 101-103 can communicate with each other and with UEs 111-116 using 5G, Long Term Evolution (LTE), LTE-A, WiMAX or other advanced wireless communication technologies.

[0078] The dashed lines show approximate ranges of the coverage areas 120 and 125, and the ranges are shown as approximate circles merely for illustration and explanation purposes. It should be clearly understood that the coverage areas associated with the gNBs, such as the coverage areas 120 and 125, may have other shapes, including irregular shapes, depending on configurations of the gNBs and changes in the radio environment associated with natural obstacles and man-made obstacles.

[0079] As will be described in more detail below, one or more of gNB 101, gNB 102, and gNB 103 include a 2D antenna array as described in embodiments of the disclosure. In some embodiments, one or more of gNB 101, gNB 102, and gNB 103 support codebook designs and structures for systems with 2D antenna arrays.

[0080] Although FIG. 1 illustrates an example of the wireless network100, various changes can be made to FIG. 1. The wireless network100 can include any number of gNBs and any number of UEs in any suitable arrangement, for example. Furthermore, gNB 101 can directly communicate with any number of UEs and provide wireless broadband access to the network130 for those UEs. Similarly, each gNB 102-103 can directly communicate with the network130 and provide direct wireless broadband access to the network130 for the UEs. In addition, gNB 101, 102 and / or 103 can provide access to other or additional external networks, such as external telephone networks or other types of data networks.

[0081] FIGs. 2a and 2b illustrate example wireless transmission and reception paths according to the disclosure. In the following description, the transmission path 200 can be described as being implemented in a gNB, such as gNB 102, and the reception path 250 can be described as being implemented in a UE, such as UE 116. However, it should be understood that the reception path 250 can be implemented in a gNB and the transmission path 200 can be implemented in a UE. In some embodiments, the reception path 250 is configured to support codebook designs and structures for systems with 2D antenna arrays as described in embodiments of the disclosure.

[0082] The transmission path 200 includes a channel coding and modulation block 205, a Serial-to-Parallel (S-to-P) block 210, a size N Inverse Fast Fourier Transform (IFFT) block 215, a Parallel-to-Serial (P-to-S) block 220, a cyclic prefix addition block 225, and an up-converter (UC) 230. The reception path 250 includes a down-converter (DC) 255, a cyclic prefix removal block 260, a Serial-to-Parallel (S-to-P) block 265, a size N Fast Fourier Transform (FFT) block 270, a Parallel-to-Serial (P-to-S) block 275, and a channel decoding and demodulation block 280.

[0083] In the transmission path 200, the channel coding and modulation block 205 receives a set of information bits, applies coding (such as Low Density Parity Check (LDPC) coding), and modulates the input bits (such as using Quadrature Phase Shift Keying (QPSK) or Quadrature Amplitude Modulation (QAM)) to generate a sequence of frequency domain modulated symbols. The Serial-to-Parallel (S-to-P) block 210 converts (such as demultiplexes) serial modulated symbols into parallel data to generate N parallel symbol streams, where N is a size of the IFFT / FFT used in gNB 102 and UE 116. The size N IFFT block 215 performs IFFT operations on the N parallel symbol streams to generate a time domain output signal. The Parallel-to-Serial block 220 converts (such as multiplexes) parallel time domain output symbols from the Size N IFFT block 215 to generate a serial time domain signal. The cyclic prefix addition block 225 inserts a cyclic prefix into the time domain signal. The up-converter 230 modulates (such as up-converts) the output of the cyclic prefix addition block 225 to an RF frequency for transmission via a wireless channel. The signal can also be filtered at a baseband before switching to the RF frequency.

[0084] The RF signal transmitted from gNB 102 arrives at UE 116 after passing through the wireless channel, and operations in reverse to those at gNB 102 are performed at UE 116. The down-converter 255 down-converts the received signal to a baseband frequency, and the cyclic prefix removal block 260 removes the cyclic prefix to generate a serial time domain baseband signal. The Serial-to-Parallel block 265 converts the time domain baseband signal into a parallel time domain signal. The Size N FFT block 270 performs an FFT algorithm to generate N parallel frequency domain signals. The Parallel-to-Serial block 275 converts the parallel frequency domain signal into a sequence of modulated data symbols. The channel decoding and demodulation block 280 demodulates and decodes the modulated symbols to recover the original input data stream.

[0085] Each of gNBs 101-103 may implement a transmission path 200 similar to that for transmitting to UEs 111-116 in the downlink, and may implement a reception path 250 similar to that for receiving from UEs 111-116 in the uplink. Similarly, each of UEs 111-116 may implement a transmission path 200 for transmitting to gNBs 101-103 in the uplink, and may implement a reception path 250 for receiving from gNBs 101-103 in the downlink.

[0086] Each of the components in FIGs. 2a and 2b can be implemented using only hardware, or using a combination of hardware and software / firmware. As a specific example, at least some of the components in FIGs. 2a and 2b may be implemented in software, while other components may be implemented in configurable hardware or a combination of software and configurable hardware. For example, the FFT block 270 and IFFT block 215 may be implemented as configurable software algorithms, in which the value of the size N may be modified according to the implementation.

[0087] Furthermore, although described as using FFT and IFFT, this is only illustrative and should not be interpreted as limiting the scope of the disclosure. Other types of transforms can be used, such as Discrete Fourier transform (DFT) and Inverse Discrete Fourier Transform (IDFT) functions. It should be understood that for DFT and IDFT functions, the value of variable N may be any integer (such as 1, 2, 3, 4, etc.), while for FFT and IFFT functions, the value of variable N may be any integer which is a power of 2 (such as 1, 2, 4, 8, 16, etc.)

[0088] Although FIGs. 2a and 2b illustrate examples of wireless transmission and reception paths, various changes may be made to FIGs. 2a and 2b. For example, various components in FIGs. 2a and 2b can be combined, further subdivided or omitted, and additional components can be added according to specific requirements. Furthermore, FIGs. 2a and 2b are intended to illustrate examples of types of transmission and reception paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communication in a wireless network.

[0089] FIG. 3a illustrates an example UE 116 according to the disclosure. The embodiment of UE 116 shown in FIG. 3a is for illustration only, and UEs 111-115 of FIG. 1 can have the same or similar configuration. However, a UE has various configurations, and FIG. 3a does not limit the scope of the disclosure to any specific implementation of the UE.

[0090] UE 116 includes an antenna 301, a radio frequency (RF) transceiver 302, a transmission (TX) processing circuit 303, a microphone 304, and a reception (RX) processing circuit 305. UE 116 also includes a speaker 306, a controller / processor 307, an input / output (I / O) interface 308, an input device(s) 309, a display 310, and a memory 311. The memory 311 includes an operating system (OS) 312 and one or more applications 313.

[0091] The RF transceiver 302 receives an incoming RF signal transmitted by a gNB of the wireless network100 from the antenna 301. The RF transceiver 302 down-converts the incoming RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is transmitted to the RX processing circuit 305, where the RX processing circuit 305 generates a processed baseband signal by filtering, decoding and / or digitizing the baseband or IF signal. The RX processing circuit 305 transmits the processed baseband signal to speaker 306 (such as for voice data) or to controller / processor 307 for further processing (such as for web browsing data).

[0092] The TX processing circuit 303 receives analog or digital voice data from microphone 304 or other outgoing baseband data (such as network data, email or interactive video game data) from controller / processor 307. The TX processing circuit 303 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceiver 302 receives the outgoing processed baseband or IF signal from the TX processing circuit 303 and up-converts the baseband or IF signal into an RF signal transmitted via the antenna 301.

[0093] The controller / processor 307 can include one or more processors or other processing devices and execute an OS 312 stored in the memory 311 in order to control the overall operation of UE 116. For example, the controller / processor 307 can control the reception of forward channel signals and the transmission of backward channel signals through the RF transceiver 302, the RX processing circuit 305 and the TX processing circuit 303 according to well-known principles. In some embodiments, the controller / processor 307 includes at least one microprocessor microcontroller.

[0094] The controller / processor 307 is also capable of executing other processes and programs residing in the memory 311, such as operations for channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the disclosure. The controller / processor 307 can move data into or out of the memory 311 as required by an execution process. In some embodiments, the controller / processor 307 is configured to execute the application 313 based on the OS 312 or in response to signals received from the gNB or the operator. The controller / processor 307 is also coupled to an I / O interface 308, where the I / O interface 308 provides UE 116 with the ability to connect to other devices such as laptop computers and handheld computers. I / O interface 308 is a communication path between these accessories and the controller / processor 307.

[0095] The controller / processor 307 is also coupled to the input device(s) 309 and the display 310. An operator of UE 116 can input data into UE 116 using the input device(s) 309. The display 310 may be a liquid crystal display or other display capable of presenting text and / or at least limited graphics (such as from a website). The memory 311 is coupled to the controller / processor 307. A part of the memory 311 can include a random access memory (RAM), while another part of the memory 311 can include a flash memory or other read-only memory (ROM).

[0096] Although FIG. 3a illustrates an example of UE 116, various changes can be made to FIG. 3a. For example, various components in FIG. 3a can be combined, further subdivided or omitted, and additional components can be added according to specific requirements. As a specific example, the controller / processor 307 can be divided into a plurality of processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Furthermore, although FIG. 3a illustrates that the UE 116 is configured as a mobile phone or a smart phone, UEs can be configured to operate as other types of mobile or fixed devices.

[0097] FIG. 3b illustrates an example gNB 102 according to the disclosure. The embodiment of gNB 102 shown in FIG. 3b is for illustration only, and other gNBs of FIG. 1 can have the same or similar configuration. However, a gNB has various configurations, and FIG. 3b does not limit the scope of the disclosure to any specific implementation of a gNB. It should be noted that gNB 101 and gNB 103 can include the same or similar structures as gNB 102.

[0098] As shown in FIG. 3b, gNB 102 includes a plurality of antennas 370a-370n, a plurality of RF transceivers 372a-372n, a transmission (TX) processing circuit 374, and a reception (RX) processing circuit 376. In certain embodiments, one or more of the plurality of antennas 370a-370n include a 2D antenna array. gNB 102 also includes a controller / processor 378, a memory 380, and a backhaul or network interface 382.

[0099] RF transceivers 372a-372n receive an incoming RF signal from antennas 370a-370n, such as a signal transmitted by UEs or other gNBs. RF transceivers 372a-372n down-convert the incoming RF signal to generate an IF or baseband signal. The IF or baseband signal is transmitted to the RX processing circuit 376, where the RX processing circuit 376 generates a processed baseband signal by filtering, decoding and / or digitizing the baseband or IF signal. RX processing circuit 376 transmits the processed baseband signal to controller / processor 378 for further processing.

[0100] The TX processing circuit 374 receives analog or digital data (such as voice data, network data, email or interactive video game data) from the controller / processor 378. TX processing circuit 374 encodes, multiplexes and / or digitizes outgoing baseband data to generate a processed baseband or IF signal. RF transceivers 372a-372n receive the outgoing processed baseband or IF signal from TX processing circuit 374 and up-convert the baseband or IF signal into an RF signal transmitted via antennas 370a-370n.

[0101] The controller / processor 378 can include one or more processors or other processing devices that control the overall operation of gNB 102. For example, the controller / processor 378 can control the reception of forward channel signals and the transmission of backward channel signals through the RF transceivers 372a-372n, the RX processing circuit 376 and the TX processing circuit 374 according to well-known principles. The controller / processor 378 can also support additional functions, such as higher layer wireless communication functions. For example, the controller / processor 378 can perform a Blind Interference Sensing (BIS) process such as that performed through a BIS algorithm, and decode a received signal from which an interference signal is subtracted. A controller / processor 378 may support any of a variety of other functions in gNB 102. In some embodiments, the controller / processor 378 includes at least one microprocessor microcontroller.

[0102] The controller / processor 378 is also capable of executing programs and other processes residing in the memory 380, such as a basic OS. The controller / processor 378 can also support channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the disclosure. In some embodiments, the controller / processor 378 supports communication between entities such as web RTCs. The controller / processor 378 can move data into or out of the memory 380 as required by an execution process.

[0103] The controller / processor 378 is also coupled to the backhaul or network interface 382. The backhaul or network interface 382 allows gNB 102 to communicate with other devices or systems through a backhaul connection or through a network. The backhaul or network interface 382 can support communication over any suitable wired or wireless connection(s). For example, when gNB 102 is implemented as a part of a cellular communication system, such as a cellular communication system supporting 5G or new radio access technology or NR, LTE or LTE-A, the backhaul or network interface 382 can allow gNB 102 to communicate with other gNBs through wired or wireless backhaul connections. When gNB 102 is implemented as an access point, the backhaul or network interface 382 can allow gNB 102 to communicate with a larger network, such as the Internet, through a wired or wireless local area network or through a wired or wireless connection. The backhaul or network interface 382 includes any suitable structure that supports communication through a wired or wireless connection, such as an Ethernet or an RF transceiver.

[0104] The memory 380 is coupled to the controller / processor 378. A part of the memory 380 can include an RAM, while another part of the memory 380 can include a flash memory or other ROMs. In certain embodiments, a plurality of instructions, such as the BIS algorithm, are stored in the memory. The plurality of instructions are configured to cause the controller / processor 378 to execute the BIS process and decode the received signal after subtracting at least one interference signal determined by the BIS algorithm.

[0105] As will be described in more detail below, the transmission and reception paths of gNB 102 (implemented using RF transceivers 372a-372n, TX processing circuit 374 and / or RX processing circuit 376) support aggregated communication with FDD cells and TDD cells.

[0106] Although FIG. 3b illustrates an example of gNB 102, various changes may be made to FIG. 3b. For example, gNB 102 can include any number of each component shown in FIG. 3a. As a specific example, the access point can include many backhaul or network interfaces 382, and the controller / processor 378 can support routing functions to route data between different network addresses. As another specific example, although shown as including a single instance of the TX processing circuit 374 and a single instance of the RX processing circuit 376, gNB 102 can include multiple instances of each (such as one for each RF transceiver).

[0107] In the disclosure, the term “channel state information (CSI)” may be used interchangeably with the terms “CSI parameter” or “CSI quantity”.

[0108] In the disclosure, CSI may include at least one of the followings: CSI reference signal (CSI-RS) resource indicator (CRI), rank indicator (RI), precoding matrix indicator (PMI), channel quality indicator (CQI), layer indicator (LI), synchronization signal (SS) / physical broadcast channel (PBCH) block resource indicator (SSBRI), layer 1-reference signal received power (L1-RSRP), layer 1-single to interference noise ratio (L1-SINR), CapabilityIndex.

[0109] In the disclosure, the term “CSI reporting configuration” may be used interchangeably with the terms “CSI reporting configuration information” or “information for CSI reporting configuration” or “information for configuring CSI report”.

[0110] In the disclosure, the CSI may be the CSI reported by the UE in a report, or in a report instance.

[0111] In the disclosure, the term “reference signal” may be used interchangeably with the term “reference signal resource”.

[0112] In the disclosure, the reference signal may include at least one of the followings: a reference signal for synchronization, a reference signal for demodulation (e.g., a demodulation reference signal (DM-RS), a reference signal for obtaining of the channel state, a reference signal for phase tracking, a reference signal for mobility, a reference signal for positioning, a reference signal for channel measurement, a reference signal for interference measurement, a reference signal for sounding. Optionally, the reference signal for synchronization includes at least one of the followings: a primary synchronization signal, a secondary synchronization signal. Optionally, the reference signal for synchronization may include a synchronization signal / physical broadcast channel block (SS / PBCH block, SSB). Optionally, the reference signal for demodulation may include at least one of the followings: a reference signal for data channel demodulation and a reference signal for control channel demodulation. Optionally, the data channel may include at least one of the followings: a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH). Optionally, the control channel may include at least one of the followings: a physical downlink control channel (PDCCH) and a physical uplink control channel (PUCCH). Optionally, the reference signal for obtaining of the channel state may include at least one of the followings: a reference signal for tracking, a reference signal for CSI acquisition, and a reference signal for beam management. Optionally, the reference signal for beam management includes at least one of the followings: a reference signal for obtaining L1-RSRP, a reference signal for obtaining L1-SINR. Optionally, obtaining L1-RSRP may be computing L1-RSRP. Optionally, obtaining L1-SINR may be computing L1-SINR. In the disclosure, the “reference signal for sounding” may be referred as a sounding reference signal (SRS).

[0113] In the disclosure, the term “beam” may include at least one of the followings: “quasi co-location (QCL) parameter”, “transmission configuration indication (TCI) state”, “spatial domain filter”, “antenna port”, “transmission and reception point (TRP)”, “reference signal”, “beam information”, “beam index”. Optionally, a beam and another beam being the same may be a beam and another beam being quasi co-located.

[0114] In the disclosure, an antenna port can be defined such that the channel over which a symbol on the antenna port is conveyed can be inferred from the channel over which another symbol on the same antenna port is conveyed.

[0115] In the disclosure, two antenna ports are said to be quasi co-located if the large-scale properties of the channel over which a symbol on one antenna port is conveyed can be inferred from the channel over which a symbol on the other antenna port is conveyed. Optionally, the large-scale properties include one or more of delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters.

[0116] In the disclosure, the term “QCL parameter” may be used interchangeably with the terms “QCL information”, “QCL assumption”, “QCL configuration”, “QCL configuration and / or QCL type”. Optionally, the QCL parameter may include / represent at least one of the followings: Doppler shift, Doppler spread, average delay, delay spread, spatial reception parameter. The spatial reception parameter may be a parameter for spatial reception. Optionally, the QCL parameter may include a combination of different types of parameters. For example, the QCL parameter may include Doppler shift, Doppler spread, average delay and delay spread, and such QCL parameter may be referred as QCL parameter type A. For example, the QCL parameter may include Doppler shift and Doppler spread, and such QCL parameter may be referred as QCL parameter type B. For example, the QCL parameter may include Doppler shift and average delay, and such QCL parameter may be referred as QCL parameter type C. For example, the QCL parameter may include spatial reception parameter, and such QCL parameter may be referred as QCL parameter type D. For example, two antenna ports are said to be quasi co-located if the large-scale properties of the channel over which a symbol on one antenna port is conveyed can be inferred from the channel over which a symbol on the other antenna port is conveyed. Optionally, the large-scale properties include one or more of delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameters. For example, two antenna ports are said to be quasi co-located subject to QCL parameter type D if spatial Rx parameters of the channel over which a symbol on one antenna port is conveyed can be inferred from the channel over which a symbol on the other antenna port is conveyed.

[0117] In the disclosure, the term “TCI state” may be used interchangeably with the terms “TCI state configuration” or “TCI state configuration information” or “information for configuring the TCI state” or “information for indicating the TCI state”. Optionally, the TCI state may be a unified TCI state. Optionally, the TCI state may be at least one of an uplink TCI state (UL TCI state), a downlink TCI state (DL TCI state), a joint TCI state. Optionally, the unified TCI state may be an uplink TCI state (UL TCI state) and a downlink TCI state (DL TCI state), or a joint TCI state.

[0118] Optionally, a TCI state may include parameters configuring quasi co-location relationships, these parameters configure the relationship between the reference signal (e.g., one or two reference signals, or one or two downlink reference signals) and at least one of the followings: a demodulation reference signal (DM-RS) port of the PDSCH, a DM-RS port of the PDCCH, a CSI-RS port of a CSI-RS resource. Optionally, a quasi co-location relationship is configured by a higher layer parameter (e.g., qcl-Type1) for the first downlink reference signal. Optionally, a quasi co-location relation is configured by a higher layer parameter (e.g., qcl-Type2) for the second downlink reference signal. In case of two downlink reference signals, the QCL types are not the same, regardless of whether the references are to the same DL RS or different DL RSs.

[0119] In the disclosure, the term “spatial domain filter” may be used interchangeably with the terms “spatial filter” or “uplink transmission spatial domain filter” or “spatial domain filter for uplink transmission” or “spatial domain filter for downlink reception”.

[0120] In the disclosure, the term “transmission occasion of reference signal resource” may be used interchangeably with the term “occasion of reference signal resource” or “reception occasion of reference signal resource” or “transmission occasion of reference signal” or “occasion of reference signal” or “reception occasion of reference signal”.

[0121] In the disclosure, the term “UE capability” may be used interchangeably with the terms “UE feature” or “UE feature group” or “UE capability parameter” or “reported UE capability” or “UE capability signaling” or “reported UE capability parameter”.

[0122] In the disclosure, a time domain resource may include / correspond to several time domain units.

[0123] In the disclosure, a time domain unit may be one of: a frame, a subframe, a slot, a sub-slot, a symbol. Optionally, the sub-slot may be a subset of a slot in time domain. For example, symbols included in the sub-slot are a subset of symbols included in the slot. Optionally, in the disclosure, the time domain unit may be one of: a second, a millisecond, a microsecond, a nanosecond, and a sample.

[0124] In the disclosure, a frequency domain resource may include / correspond to several frequency domain units.

[0125] In the disclosure, a frequency domain unit may be at least one of a band, a subband, a component carrier (CC), a bandwidth part (BWP), a resource block, a resource block group (RBG), a subcarrier, a carrier, a frequency band, a frequency range, a cell, a serving cell. The resource block may be a physical resource block (PRB) or a common resource block (CRB). The frequency range may be frequency range 1, frequency range 2 (e.g., frequency range 2-1 and / or frequency range 2-2).

[0126] In the disclosure, a time-frequency unit may be one of a resource element (RE), a resource element group (REG). The resource element group may include one or more resource elements. For example, a resource element group may include 6 or 12 resource elements.

[0127] In the disclosure, the starting time domain position of a channel or signal or resource is an earlier position in time domain, and the ending time domain position of a channel or signal or resource is a later position in time domain.

[0128] In the disclosure, the starting frequency domain position of a channel or signal or resource is a lower position in frequency domain, and the ending frequency domain position of a channel or signal or resource is a higher position in frequency domain.

[0129] In the disclosure, the term “PDCCH” may be used interchangeably with the terms “downlink control channel” or “control channel for downlink transmission” or “control channel for downlink”.

[0130] In the disclosure, the term “PDCCH” may be used interchangeably with the term “PDCCH candidate”.

[0131] In the disclosure, the term “PDSCH” may be used interchangeably with the terms “downlink data channel” or “data channel for downlink transmission” or “data channel for downlink”.

[0132] In the disclosure, the term “PUCCH” may be used interchangeably with the terms “uplink control channel” or “control channel for uplink transmission” or “control channel for uplink”.

[0133] In the disclosure, the term “PUSCH” may be used interchangeably with the terms “uplink data channel” or “data channel for uplink transmission” or “data channel for uplink”.

[0134] In the disclosure, the term “downlink control information (DCI)” may be used interchangeably with the terms “DCI format” or “control information for downlink”.

[0135] In the disclosure, the term “uplink control information (UCI)” may be used interchangeably with the term “control information for uplink”.

[0136] In the disclosure, detecting DCI includes: receiving and / or decoding DCI.

[0137] In the disclosure, the term “information bits of DCI / UCI” may be used interchangeably with the terms “information bits associated with DCI / UCI” or “information bits included in DCI / UCI” or “information bits corresponding to DCI / UCI”. Optionally, the information bits associated with DCI / UCI may include information bits of the DCI / UCI and check bits (for example, cyclic redundancy check (CRC) bits) corresponding to the DCI / UCI. Optionally, the information bits associated with DCI / UCI may include information bits of the DCI / UCI and bits (for example, cyclic redundancy check (CRC) bits) for checking the DCI / UCI.

[0138] In the disclosure, the term “information bits of PDSCH / PUSCH” may be used interchangeably with the term “information bits associated with PDSCH / PUSCH” or “information bits carried by PDSCH / PUSCH” or “information bits of TB included in PDSCH / PUSCH” or “information bits of TB carried by PDSCH / PUSCH”. Optionally, the information bits associated with the information bits carried by PDSCH / PUSCH may include the information bits of TB carried by PDSCH / PUSCH and the check bits (for example, cyclic redundancy check (CRC) bits) corresponding to the TB. Optionally, the information bits associated with PDSCH / PUSCH may include information bits of PDSCH / PUSCH and bits (for example, cyclic redundancy check (CRC) bits) for checking the TB carried by the PDSCH / PUSCH.

[0139] In the disclosure, the term “size of information field” may be used interchangeably with the terms “bitwidth of information field” or “number of information bits in information field”.

[0140] In the disclosure, the information bits of the DCI may be the information bits included in the DCI, or the information bits associated with the DCI, or the payload of the DCI.

[0141] In the disclosure, the existence of an information field may be that the size of the information field is greater than 0 bit. The absence of an information field may be that the size of the information field is equal to 0 bit.

[0142] In the disclosure, the value x of an information field may correspond to the (x+1)-th codepoint of the information field, x≥0. The term “value of an information field” may be used interchangeably with the term “codepoint of an information field”. The term “value x of an information field” may be used interchangeably with the term “(x+1)-th codepoint of an information field”, where x≥0.

[0143] In the disclosure, the term “control resource set (CORESET)” may be used interchangeably with the terms “control resource” or “resource for receiving control information” or “resource for monitoring PDCCH” or “resource for detecting control information”.

[0144] In the disclosure, the term “search space” may be used interchangeably with the terms “PDCCH search space” or “PDCCH search space set” or “PDCCH candidate search space” or “PDCCH candidate search space set” or “search space for searching PDCCH” or “search space for searching PDCCH candidate” or “search space set for searching PDCCH candidate” or “search space set for searching PDCCH candidate”. Optionally, the search space may be a common search space (CSS) or a UE-specific search space (USS). Optionally, the search space may be used for detecting DCI. Optionally, the search space may be used for detecting DCI format.

[0145] In the disclosure, the term “PDCCH candidate associated with search space” may be used interchangeably with the term “PDCCH candidate in search space”.

[0146] In the disclosure, the modulation scheme associated with the PDCCH candidate may be the modulation scheme used by the corresponding PDCCH candidate. The aggregation level associated with the PDCCH candidate may be the aggregation level of the corresponding PDCCH candidate.

[0147] In the disclosure, the UE may monitor the PDCCH (or monitor the PDCCH candidate) in PDCCH monitoring occasion(s). Optionally, the PDCCH monitoring occasion may be one or more (consecutive) time domain units. Optionally, the PDCCH monitoring occasion may be an occasion for monitoring the PDCCH, or an occasion for monitoring the PDCCH candidate.

[0148] In the disclosure, monitoring the PDCCH candidate may be receiving the PDCCH candidate and / or decoding according to the monitored DCI format.

[0149] In the disclosure, the DCI format may be at least one of the followings: DCI format 0_0, DCI format 0_1, DCI format 0_2, DCI format 0_3, DCI format 1_0, DCI format 1_1, DCI format 1_2, and DCI format 1_3. In the disclosure, the type of the DCI format may be one of the followings: DCI format 0_0, DCI format 0_1, DCI format 0_2, DCI format 0_3, DCI format 1_0, DCI format 1_1, DCI format 1_2, DCI format 1_3.

[0150] In the disclosure, hybrid automatic repeat request (HARQ) information may be hybrid automatic repeat request-acknowledgement (HARQ-ACK) information.

[0151] In the disclosure, the PDCCH may carry the DCI and / or the CRC corresponding to the DCI, or the DCI and / or the CRC corresponding to the DCI may be in the PDCCH. Optionally, the CRC may be scrambled in a specific manner. For example, optionally, the CRC may be scrambled based on a radio network temporary identifier (RNTI). Two PDCCHs having the same scrambling may be these two PDCCHs being scrambled by the same RNTI. Optionally, the RNTI may be one of a cell radio network temporary identifier (C-RNTI), a configured scheduling radio network temporary identifier (CS-RNTI).

[0152] In the disclosure, the higher layer parameter includes at least one of a radio resource control (RRC) parameter, a media access control (MAC)-control element (CE) (MAC-CE) parameter. The RRC parameter may be a parameter configured / indicated by RRC signaling. The MAC-CE parameter may be a parameter indicated / activated by MAC-CE signaling. Optionally, information being configured by a higher layer parameter may be the information being indicated / activated by the higher layer parameter.

[0153] In the disclosure, the higher layer signaling includes at least one of the RRC parameter, the parameter indicated by MAC-CE; or the higher layer signaling may include at least one of RRC signaling and MAC-CE signaling. Optionally, information being configured by higher layer signaling may be the information being indicated / activated by the higher layer signaling.

[0154] In the disclosure, the UE obtaining configuration information may be the UE receiving / being configured with the configuration information. In the disclosure, “obtaining configuration information” may be used interchangeably with the terms “receiving configuration information” or “being configured with configuration information”.

[0155] In the disclosure, a cell includes at least one of: a serving cell, a candidate cell, a primary cell, a secondary cell, and a special cell. The special cell may be a current special cell.

[0156] In the disclosure, when the DCI schedules a channel or signal, a cell receiving or transmitting the channel or signal may be referred as a scheduled cell. A cell where the DCI is detected or a cell where the DCI is monitored / received may be referred as a scheduling cell.

[0157] In the disclosure, when the DCI schedules a channel or signal, a BWP receiving or transmitting the channel or signal may be referred as a scheduled BWP. A BWP where the DCI is detected, or a BWP where the PDCCH associated with the DCI is monitored / received may be referred as a scheduling BWP.

[0158] In the disclosure, “determining measurement” may be determining the result of the measurement, or obtaining the result of the measurement, or obtaining the measurement based on the reference signal, or obtaining the measurement based on the measurement resource, or obtaining the measurement for determining the CSI.

[0159] In the disclosure, “determining channel measurement” may be determining the result of the channel measurement, or obtaining the result of the channel measurement, or obtaining the channel measurement based on the reference signal, or obtaining the channel measurement based on the measurement resource, or obtaining the channel measurement for determining the CSI.

[0160] In the disclosure, “determining interference measurement” may be determining the result of the interference measurement, or obtaining the result of the interference measurement, or obtaining the interference measurement based on the reference signal, or obtaining the interference measurement based on the measurement resource, or obtaining the interference measurement used for determining the CSI.

[0161] In the disclosure, the term “uplink channel associated with CSI report” may be used interchangeably with the terms “uplink channel corresponding to the CSI report” or “uplink channel carrying the CSI report”.

[0162] In the disclosure, a numerology may refer to a set of parameters that define a basic time unit and frequency unit in the wireless communication system. These parameters may be used for determining the waveform, subcarrier spacing, and sampling rate of the signal. The numerology may include at least one of the followings: subcarrier spacing, cyclic prefix, symbol periodicity, sampling rate, slot length, frame structure. Optionally, the subcarrier spacing may be the frequency difference between two neighboring subcarriers, typically in Hertz (Hz). The subcarrier spacing decides the bandwidth and time resolution of the system. Optionally, the cyclic prefix adds a cyclic prefix at the beginning of the OFDM symbol. The length of the cyclic prefix is associated with the subcarrier spacing: the addition of the cyclic prefix is to reduce the impact of multipath effects. Optionally, the symbol periodicity may be the duration of one OFDM symbol. Optionally, the symbol periodicity may be the reciprocal of the subcarrier spacing. Optionally, the sampling rate may be the sampling frequency at which signals are received and transmitted. Optionally, the sampling rate is associated with the subcarrier spacing. Optionally, the slot length may be: in a time division duplex (TDD) system, a slot is a time period used for distinguishing uplink and downlink. Optionally, the slot length is associated with the subcarrier spacing and the symbol periodicity. Optionally, the frame structure is used for defining the organization of slots within the frame, including the length of the frame and the number of slots. In 5G new radio (NR), multiple different numerology configurations may be supported to fit different frequency bands and application scenarios. For example, low frequency bands may use larger subcarrier spacing to support wider bandwidth and longer transmission distance, while high frequency bands may use smaller subcarrier spacing to support higher data rate and lower latency.

[0163] In the disclosure, a cell may be a primary cell (PCell) and / or a primary secondary cell (PSCell) and / or a secondary cell and / or a special cell. In the disclosure, the cell may be one of the primary cell and the secondary cell. The Special Cell may be the PCell or the PSCell. In dual connectivity operation, the special cell refers to the primary cell of a master cell group (MCG) or the primary secondary cell of a secondary cell group (SCG), otherwise, the special cell refers to the primary cell. A cell may be a serving cell or a non-serving cell.

[0164] The exemplary embodiments of the disclosure are further described below in conjunction with the accompanying drawings.

[0165] FIG. 4 illustrates a method 400 performed by a user equipment (UE) according to various embodiments of the disclosure. The method 400 includes: at 401, the UE receives a first channel state information (CSI) reporting configuration and a second CSI reporting configuration for Layer 1 / Layer 2 triggered mobility (LTM), where the first CSI reporting configuration includes configuration information of a resource set for channel measurement, the configuration information of the resource set for channel measurement indicates K CSI reference signal CSI-RS resource identifiers (IDs) and K LTM candidate configuration IDs, K≥1, where the k-th CSI-RS resource ID of the K CSI-RS resource IDs is associated with the k-th LTM candidate configuration ID of the K LTM candidate configuration IDs, 1≤k≤K, the first CSI reporting configuration further includes first configuration information of L candidate cells, where each of the L first configuration information indicates at least one of a codebook parameter, a port indication for non-PMI feedback, and a frequency domain configuration parameter, and L is equal to the number of LTM candidate configuration IDs after duplicated IDs of the K LTM candidate configuration IDs being removed, the LTM candidate configuration ID of the i-th candidate cell of the L candidate cells is the i-th LTM candidate configuration ID after the duplicated IDs of the K LTM candidate configuration IDs being removed, where 1≤i≤L; and at 402, the UE reports CSI of N candidate cells of the L candidate cells based on the first CSI reporting configuration, 1≤N≤L, or determines whether to report CSI report corresponding to the first CSI reporting configuration based on the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration, or drops the CSI report corresponding to the first CSI reporting configuration when the L candidate cells are the current special cell, where the N candidate cells are determined based on at least one of the followings: values of CQIs of the L candidate cells; the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration; whether the N candidate cells exclude the current special cell. Each step in the method 400 shown in FIG. 4 is described in detail below.

[0166] When the UE moves between cells, cell switch is required to ensure communication quality. The cell switch may be performed via Layer 3 signaling. However, due to the large Layer 3 signaling transmission delay, the procedure of cell switch will be longer. During the procedure of cell switch, the transmission parameter for the UE is to be reconfigured. Before the reconfiguration is applied, the transceiver capability of the UE is restricted, resulting in the decrease in the performance of the communication system. In order to reduce the duration of the procedure of cell switch, a method is to use Layer 1 / Layer 2 (L1 / L2) signaling with shorter application time for cell switch. For example, the cell switch is performed via L1 / L2 triggered mobility (LTM). In order to perform the LTM, the configuration information of candidate cells needs to be pre-configured so that cell switch is triggered / completed via Layer 1 / Layer 2 signaling when cell switch is required. The configuration method of configuration information associated with candidate cells is as follows.

[0167] In some cases, the UE may receive information for providing the LTM configuration (e.g., LTM-Config). Optionally, the information for providing the LTM configuration may configure one or more LTM candidate configurations (e.g., LTM-Candidate). Optionally, the candidate configuration may be the configuration associated with the candidate cell. For example, one or more LTM candidate configurations may correspond to configurations of one or more candidate cells. Optionally, the candidate cell is associated with the configuration of the RRC reconfiguration message. Optionally, the candidate configuration may be a complete candidate configuration or a delta configuration relatively to a reference configuration. Optionally, one / each LTM candidate configuration may include / be configured with at least one of the followings:

[0168] ● An LTM candidate configuration ID. The ID is used for identifying the LTM candidate configuration. For example, the ID is configured by the parameter LTM-CandidateId or LTM-CandidateId-r18. Optionally, the LTM candidate configuration ID may be used for identifying the candidate cell.

[0169] ● A physical cell ID (PCI) for LTM. The ID is used for identifying the PCI of the special cell (SpCell) of the LTM candidate configuration. Optionally, the LTM candidate configuration refers to the LTM candidate configuration configured in the parameter LTM-CandidateConfig. For example, the LTM candidate configuration may configure the configuration information of one or more cells, where the special cell of the one or more cells is identified by the PCI. Here, the special cell of the one or more cells may be referred to as the candidate cell.

[0170] ● SSB configuration information for LTM (e.g., ltm-SSB-Config). Optionally, the SSB configuration information is for the special cell of the LTM candidate configuration. The SSB configuration information for LTM may include / indicate at least one of the followings: frequency domain information, subcarrier spacing, periodicity, SSB position information. The frequency domain information may indicate the frequency point of the SSB. The frequency domain information may be indicated by the parameter ssb-Frequency. Optionally, the frequency domain information may indicate the frequency domain position (e.g., the frequency domain position of CRB #0). Optionally, the frequency domain information may indicate the frequency domain position referenced by the reference signal. Optionally, the frequency domain information indicates the frequency domain position of Point A. Optionally, Point A refers to the frequency point where the center of the lowest subcarrier of the SSB is located. Optionally, the frequency domain information indicates the frequency point of the lowest subcarrier (e.g. subcarrier #0) in the lowest resource block (RB) of the SSB. The subcarrier spacing may indicate the subcarrier spacing of the SSB. The subcarrier spacing may be indicated by the parameter subcarrierSpacing. The periodicity refers to the periodicity of the SSB, the periodicity may be indicated by the parameter ssb-Periodicity. The SSB position information is used for indicating the time domain position of the transmitted SSB. The SSB position information is indicated by a bitmap, for example. The n-th bit of the bitmap (or the n-th leftmost bit) corresponds to the SSB with index n. When the value of a bit is 0, the bit indicates that the corresponding SSB is not transmitted. When the value of a bit is 1, the bit indicates that the corresponding SSB is transmitted. For each / one candidate cell (or LTM candidate configuration), the UE determines the time domain behavior of a SSB from ssb-Periodicity and ssb-PositionsInBurst and the frequency domain behavior of a SSB is determined by the higher layer parameters subcarrierSpacing and ssb-Frequency.

[0171] ● Configuration information of the CSI-RS resource for LTM (e.g., ltm-nzp-CSI-RS-Resource-Config). Optionally, the CSI-RS resource may be a non-zero-power (NZP) CSI-RS resource. Optionally, the configuration information may configure one or more NZP CSI-RS resources. For example, each NZP CSI-RS resource may be configured by the parameter NZP-CSI-RS-Resource. Optionally, one / each NZP CSI-RS resource may be configured with at least one of the following parameters:

[0172] ● A CSI-RS resource ID. For example, the ID of the CSI-RS resource is indicated by the parameter nzp-CSI-RS-ResourceId;

[0173] ● A resource mapping parameter (e.g., resourceMapping). Optionally, the resource mapping parameter indicates the OFDM symbol position in a slot and subcarrier occupancy in a PRB of the CSI-RS resource;

[0174] ● A power control offset parameter (e.g., powerControlOffset). Optionally, the power control offset parameter indicates the power offset between the RE of the PDSCH and the RE of the NZP CSI-RS;

[0175] ● A synchronization signal power control offset parameter (e.g., powerControlOffsetSS). Optionally, the synchronization signal power control offset parameter indicates the power offset between the RE of the NZP CSI-RS and the RE of the secondary synchronization signal (SSS);

[0176] ● A scrambling ID parameter (e.g., scramblingID). For example, the scrambling ID parameter is used for indicating the scrambling ID of the CSI-RS resource;

[0177] ● A QCL parameter (e.g., qcl-InfoPeriodicCSI-RS). Optionally, the QCL parameter indicates the TCI state ID. When the CSI-RS resource is periodic, the QCL parameter is configured;

[0178] ● Frequency domain information. Optionally, the frequency domain information may include a frequency point parameter (e.g., absoluteFrequencyPointA). Optionally, the frequency domain information may indicate the frequency domain position (e.g., the frequency domain position of CRB #0). Optionally, the frequency domain information may indicate the frequency domain position referenced by the reference signal. Optionally, the frequency point parameter indicates the frequency domain position of Point A. The frequency point parameter may indicate the absolute frequency of the reference CRB. Optionally, the reference CRB may be CRB #0. The lowest subcarrier of CRB #0 is Point A. Optionally, the center frequency point of the lowest subcarrier (e.g., subcarrier #0) of CRB #0 is Point A;

[0179] ● A subcarrier spacing parameter (e.g., subcarrierSpacing). Optionally, the subcarrier spacing parameter may indicate the subcarrier spacing of the CSI-RS;

[0180] ● Information for indicating the RRC reconfiguration message (e.g., ltm-CandidateConfig). Optionally, the RRC reconfiguration message is used for configuring the LTM candidate configuration.

[0181] ● Information associated with TCI (e.g., LTM-TCI-Info). The information associated with TCI is used for LTM candidate configuration. Optionally, the information is to be used during activation of the TCI state and / or upon the reception of the procedure of LTM cell switch.

[0182] Optionally, the information for providing the LTM configuration may configure one or more resource settings for LTM (LTM-CSI-ResourceConfig).

[0183] The UE may receive L1 / L2 signaling (e.g., DCI and / or MAC-CE) and perform switching in the candidate cell corresponding to the LTM candidate configuration based on the L1 / L2 signaling. For example, there is a current cell for the UE, and the UE receives the configuration of one or more candidate cells. Optionally, when an L1 / L2 signaling received by the UE indicates one of the candidate cells, the UE switches the current cell to the indicated candidate cell. Optionally, when the UE receives an L1 / L2 signaling indicating one of the candidate cells and the indication is applied, the current cell of the UE is the indicated candidate cell. Optionally, the current cell may be a serving cell. Optionally, in the disclosure, the one or more candidate cells may all be special cells. When a certain candidate cell is switched / determined as the current cell, it may be considered that the candidate cell corresponds to the current special cell.

[0184] In order to perform LTM-related cell switch, the link quality of different candidate cells needs to be evaluated. For example, in case where the link quality of the current cell is bad and / or the link quality of the candidate cell is good, the base station may indicate the LTM-related cell switch, or the UE may be triggered with the LTM-related cell switch. A method for the base station to obtain the link quality of the candidate cell is for the UE to perform the reporting for LTM. The report may indicate the link quality of the candidate cell to the base station. The reporting for LTM may be beam reporting. For example, the link qualities of the candidate cells may be reflected by reporting the L1-RSRP of one or more beams of these candidate cells, so that the base station may make the decision for cell switch. Since beam reporting may only report rough information associated with the candidate cell (for example, L1-RSRP), the base station cannot obtain the channel state of the candidate cell only by obtaining the beam reporting. After the cell switch, the base station may only use a more conservative transmission method (for example, lower modulation coding scheme (MCS), wider precoder) to schedule the switched cell, which is disadvantageous to the data transmission efficiency of the switched cell. In order to perform downlink scheduling using a transmission method matching the channel state after the cell switch, the base station needs to obtain the CSI information (for example, PMI, RI, CQI, etc.) of the candidate cell before the cell switch or during the procedure of switch. In order to provide the CSI information, the UE may perform the CSI reporting for LTM to notify the base station of the CSI information of the one or more candidate cells. The associated configuration method / reporting method for the CSI report is discussed below.

[0185] In some cases, the UE may obtain / receive configuration information for configuring the CSI report. Optionally, the configuration information for configuring the CSI report may be configured by measurement configuration information for the CSI (e.g., CSI-MeasConfig). Optionally, the configuration information for configuring the CSI report may include the CSI reporting configuration (e.g., CSI-ReportConfig), and / or the CSI reporting configuration for LTM (e.g., LTM-CSI-ReportConfig). The CSI reporting configuration may be referred to as the reporting setting. The UE may be configured with NA≥1 CSI reporting configurations and / or X≥1 CSI reporting configurations for LTM. Optionally, the CSI reporting configuration for LTM may be the first CSI reporting configuration and / or the second CSI reporting configuration. Optionally, the CSI reporting configuration may be for the CSI or for CSI parameter computation or for CSI determination. For example, the CSI reporting configuration may be for at least one of CQI, PMI, CRI, SSBRI, LI, RI, L1-RSRP. Optionally, the UE may be configured with NB≥1 resource settings (e.g., CSI-ResourceConfig) and / or Y≥1 resource settings for LTM (e.g., LTM-CSI-ResourceConfig). Here, the resource setting may be the configuration information for configuring the CSI resource. Optionally, the resource setting may be the configuration information for configuring one or more reference signal resource sets. Optionally, the UE may be configured with one or two list(s) of trigger states. The one or two list(s) of trigger states may be configured by the higher layer parameter for aperiodic CSI reporting (e.g., CSI-AperiodicTriggerStateList) and / or the higher layer parameter for semi-persistent CSI reporting (e.g., CSI-SemiPersistentOnPUSCH-TriggerStateList). Optionally, each trigger state included in the higher layer parameter for aperiodic CSI reporting associated with the CSI reporting configuration may indicate the resource set for channel measurement and / or the resource set for interference measurement. Optionally, each trigger state may indicate a CSI reporting configuration ID for indicating the associated CSI reporting configuration. Optionally, each trigger state in the higher layer parameter for semi-persistent CSI reporting includes / indicates a CSI reporting configuration and / or a CSI reporting configuration for LTM. Optionally, the trigger state associated with aperiodic CSI reporting / semi-persistent CSI reporting may be indicated by DCI. For example, the UE detects a DCI format that includes a CSI trigger field for indicating a trigger state. Optionally, the trigger state associated with semi-persistent CSI reporting may be indicated by DCI. For example, the UE receives a MAC-CE indicating a trigger state.

[0186] The configuration method of one / each first CSI reporting configuration is discussed below. Optionally, the first CSI reporting configuration is the CSI reporting configuration for LTM. Optionally, the first CSI reporting configuration may be a CSI reporting configuration for CSI acquisition of the LTM. Optionally, the report quantity corresponding to the first CSI reporting configuration may include at least one of PMI, RI, CQI, and LI. One / each first CSI reporting configuration is configured with / includes / indicates / is associated with the resource setting. Optionally, the resource setting may be the resource setting for LTM. Optionally, the resource setting may be for measurement. Optionally, the resource setting may be for channel measurement and / or interference measurement. Optionally, the resource setting may include the resource setting for channel measurement. Optionally, the resource setting may include two resource settings, where one resource setting is for channel measurement and the other resource setting is for interference measurement. Optionally, one / each resource setting may indicate / configure the resource set. The resource set may include / indicate K (K≥1) reference signals. For example, the configuration information corresponding to the resource set may indicate the IDs of the K reference signals. Here, the reference signal may be referred to as the reference signal resource. The ID of the reference signal may be referred to as the reference signal resource ID. Optionally, the reference signal resources in the resource set may be from the SSBs indicated by the SSB configuration information for LTM. Optionally, the reference signal resources in the resource set may be from the CSI-RS resources indicated by the configuration information of the CSI-RS resource for LTM. Optionally, the reference signal may be SSB and / or CSI-RS. Optionally, the CSI-RS may be NZP CSI-RS. For SSB, the resource setting may include the configuration information of the resource set. The configuration information of the resource set may indicate / include the IDs of the K reference signals and / or the K LTM candidate configuration IDs. In the disclosure, the ID may be referred to as the index. Optionally, the LTM candidate configuration ID is used for indicating / representing the candidate cell associated with the ID of the reference signal. Optionally, the ID of the k-th (1≤k≤K) reference signal is associated with the k-th LTM candidate configuration ID. Optionally, the IDs of the K reference signals correspond one-to-one to the K LTM candidate configuration IDs. Optionally, the ID of the reference signal may be an SSB ID and / or a CSI-RS resource ID. For example, SSB #2, SSB #3 and SSB #5 are configured, and candidate configuration ID #1, candidate configuration ID #3 and candidate configuration ID #4 are configured, SSB #2 is associated with candidate configuration ID #1, SSB #3 is associated with candidate configuration ID #3, and SSB #5 is associated with candidate configuration ID #4. For example, CSI-RS #1, CSI-RS #2 and CSI-RS #3 are configured, and candidate configuration ID #2, candidate configuration ID #3 and candidate configuration ID #4 are configured, CSI-RS #1 is associated with candidate configuration ID #2, CSI-RS #2 is associated with candidate configuration ID #3, and CSI-RS #3 is associated with candidate configuration ID #4. Refer above for the configuration method of the CSI-RS resource ID.

[0187] ● Optionally, the K LTM candidate configuration IDs may be associated with the L candidate cells. Optionally, the L candidate cells may be determined based on the K LTM candidate configuration IDs. Optionally, the K LTM candidate configuration IDs correspond to the L candidate cells. It may be considered that the value of an LTM candidate configuration ID corresponds to a candidate cell. Since there may be duplicated LTM candidate configuration IDs in the K LTM candidate configuration IDs, the determination of L needs to be based on the number of different LTM candidate configuration IDs. Optionally, L is determined based on the number of the LTM candidate configuration IDs associated with the reference signal in the resource set. Optionally, in some cases, L=K. Optionally, L=K in case where the K LTM candidate configuration IDs are different from each other. Optionally, L is determined based on the number of different LTM candidate configuration IDs associated with the reference signal in the resource set. The different LTM candidate configuration IDs associated with the reference signal may be non-overlapping LTM candidate configuration IDs associated with the reference signal. Optionally, L is equal to the number of different LTM candidate configuration IDs of the K LTM candidate configuration IDs. Optionally, L is equal to the number of the LTM candidate configuration IDs after duplicated IDs of the K LTM candidate configuration IDs being removed. Optionally, L is equal to the number of the K LTM candidate configuration IDs with different LTM candidate configuration ID values. In the disclosure, the LTM candidate configuration ID may be the value of the LTM candidate configuration ID. Optionally, the p-th (1≤p≤L) candidate cell of the L candidate cells corresponds to the p-th LTM candidate configuration ID of different LTM candidate configuration IDs. Optionally, the p-th (1≤p≤L) candidate cell of the L candidate cells corresponds to the LTM candidate configuration ID with the p-th smallest (or the p-th largest) value of different LTM candidate configuration IDs. Optionally, the LTM candidate configuration ID corresponding to the p-th (1≤p≤L) candidate cell of the L candidate cells is the p-th LTM candidate configuration ID after the duplicated IDs of the K LTM candidate configuration IDs being removed. Optionally, the LTM candidate configuration ID corresponding to the p-th (1≤p≤L) candidate cell of the L candidate cells is the p-th smallest (or the p-th largest) LTM candidate configuration ID after the duplicated IDs of the K LTM candidate configuration IDs being removed. Optionally, the LTM candidate configuration ID corresponding to the p-th (1≤p≤L) candidate cell of the L candidate cells is the p-th ID in the set consisting of different ID values of the K LTM candidate configuration IDs. Optionally, the j-th element is smaller than the (j+1)-th element in the set consisting of different ID values of the K LTM candidate configuration IDs, where 1≤j≤L-1. Optionally, the j-th element is greater than the (j+1)-th element in the set consisting of different ID values of the K LTM candidate configuration IDs, where 1≤j≤L-1. The p-th candidate cell of the L candidate cells may be referred to as candidate cell #p. Optionally, when L=K, the first candidate cell of the L candidate cells corresponds to the LTM candidate configuration ID with the smallest value of the K LTM candidate configuration IDs. Optionally, when L=K, the second candidate cell of the L candidate cells corresponds to the LTM candidate configuration ID with the second smallest value of the K LTM candidate configuration IDs, and so on. Optionally, the first candidate cell of the L candidate cells corresponds to the LTM candidate configuration ID with the smallest value of different LTM candidate configuration IDs. Optionally, the second candidate cell of the L candidate cells corresponds to the LTM candidate configuration ID with the second smallest value of different LTM candidate configuration IDs, and so on. For example, LTM candidate configuration ID #3, LTM candidate configuration ID #3, and LTM candidate configuration ID #1 may correspond to two candidate cells, where the first candidate cell corresponds to LTM candidate configuration ID #1; the second candidate cell corresponds to LTM candidate configuration ID #3. The above method defines the mapping relationship between the LTM candidate configuration IDs and the candidate cells, so that the UE may use the corresponding parameter to compute the CSI of the corresponding candidate cell, improving the accuracy of the CSI and improving the reliability of the communication system. In the disclosure, the description of “LTM candidate configuration ID” may also be applicable to the description of “PCI” or “PCI associated with / corresponding to the LTM candidate configuration ID” or “PCI in the LTM candidate configuration corresponding to the LTM candidate configuration ID”. In the disclosure, the term “LTM candidate configuration ID corresponding to the candidate cell” may be used interchangeably with the term “LTM candidate configuration ID of the candidate cell”.

[0188] When K CSI-RS resources are aperiodic CSI-RS, the slot where the aperiodic CSI-RS is transmitted needs to be determined through the DCI triggering aperiodic CSI report and a CSI-RS triggering offset. Optionally, the UE receives a DCI triggering aperiodic CSI report. The DCI is in slot n. The slot where the aperiodic CSI-RS (e.g., the CSI-RS in the K CSI-RS resources) is transmitted is slot n+X, . Here, X represents the CSI-RS triggering offset. Optionally, X may be configured by the aperiodic triggering offset parameter (e.g., aperiodicTriggeringOffset or aperiodicTriggeringOffset-r16 or aperiodicTriggeringOffset-r17). The resource set may be configured with a CSI-RS triggering offset. Optionally, the subcarrier spacing of X is the subcarrier spacing of the CSI-RS or the subcarrier spacing numerology of the CSI-RS. Optionally, the subcarrier spacing of X is equal to the subcarrier spacing configuration of the CSI-RS. Optionally, and are respectively the subcarrier spacing configuration of the CSI-RS and the subcarrier spacing configuration of the PDCCH.

[0189] Since the K CSI-RS resources may be from different candidate cells, their subcarrier spacings may be the same or different. When a resource set shares one X, different subcarrier spacings of different CSI-RSs may result that different CSI-RSs are in different slots, increasing the complexity of the UE measurement. To avoid such situation, the subcarrier spacing corresponding to X may be defined, so that K CSI-RSs are in the same slot. Optionally, the subcarrier spacing of X may be determined based on the smallest / largest subcarrier spacing of the subcarrier spacings of the K CSI-RS resources. For example, the subcarrier spacing of X is equal to the smallest / largest subcarrier spacing of the subcarrier spacings of the K CSI-RS resources. Optionally, the subcarrier spacing corresponding to may be determined based on the smallest / largest subcarrier spacing of the subcarrier spacings of the K CSI-RS resources. Optionally, the subcarrier spacing corresponding to μ_CSIRS is equal to the smallest / largest subcarrier spacing of the subcarrier spacings of the K CSI-RS resources. Optionally, the subcarrier spacing corresponding to X and the subcarrier spacing corresponding to μ_CSIRS are the same. Another method to avoid CSI-RSs being in different slots is to configure the CSI-RS triggering offset for the CSI-RS reference signal resource of each candidate cell, or configure the corresponding CSI-RS triggering offset for each resource in the resource set. Optionally, the UE may receive K aperiodic triggering offset parameters, where the K aperiodic triggering offset parameters are respectively used for determining X for each reference signal in the K reference signal resources. Optionally, the UE may receive L aperiodic triggering offset parameters, where the L aperiodic triggering offset parameters may be respectively used for determining X for the reference signal corresponding to each of the L candidate cells corresponding to the K reference signal resources. Optionally, the L aperiodic triggering offset parameters may be configured by L first configuration information. The above method allows for multiple aperiodic CSI-RSs to be transmitted in different slots, reducing the complexity of the UE measurement and improving the performance of the communication system.

[0190] One / each first CSI reporting configuration may be configured with / include / indicate / be associated with information for indicating time domain behavior (e.g., reportConfigType or ltm-ReportConfigType). The information for indicating the time domain behavior may indicate one of aperiodic, semiPersistentOnPUCCH, semiPersistentOnPUSCH, periodic. For example, the parameter corresponding to the information for indicating the time domain behavior may be set to ‘aperiodic’, ‘semiPersistentOnPUCCH’, ‘semiPersistentOnPUSCH’ or ‘periodic’. Optionally, the aperiodic time domain behavior may be understood as the corresponding CSI report is aperiodic CSI report. Optionally, the semi-persistent time domain behavior corresponds to semi-persistent CSI report. Optionally, the semi-persistent on PUCCH time domain behavior corresponds to semi-persistent CSI report transmitted on the PUCCH. Optionally, the semi-persistent on PUSCH time domain behavior corresponds to the semi-persistent CSI report transmitted on the PUSCH. Optionally, the aperiodic time domain behavior corresponds to aperiodic CSI report. For the periodic and / or semi-persistent CSI report, the UE may be configured with a periodicity and slot offset. The UE may apply the periodicity and slot offset on the corresponding slot to transmit the CSI report. Optionally, the configured periodicity and slot offset applies in the numerology of the UL BWP in which the CSI report is configured to be transmitted on.

[0191] One / each first CSI reporting configuration may be configured with / include / indicate / be associated with a report quantity parameter (e.g., the higher layer parameter reportQuantity). Optionally, the report quantity parameter is used for indicating to report CSI-related quantities. Optionally, the CSI-related quantities may include at least one of the followings: CRI, RI, PMI, and CQI; CRI, RI, LI, PMI, and CQI; CRI, RI, and i1 (codebook parameter); CRI, RI, i1, and CQI; CRI, RI, and CQI; CRI and L1-RSRP; SSBRI and L1-RSRP; none.

[0192] ● Optionally, the CSI-related quantities being CRI, RI, PMI and CQI means that the report quantity parameter is set / configured to ‘cri-RI-PMI-CQI’. Optionally, ‘the CSI-related quantities being CRI, RI, LI, PMI and CQI means that the report quantity parameter is set / configured to ‘cri-RI-LI-PMI-CQI’. Optionally, the CSI-related quantities being CRI, RI, PMI and CQI means that the report quantity parameter is set / configured to ‘cri-RI-i1’. Optionally, the CSI-related quantities being CRI, RI, i1 and CQI means that the report quantity parameter is set / configured to ‘cri-RI-i1-CQI’. Optionally, the CSI-related quantities being CRI, RI and CQI means that the report quantity parameter is set / configured to ‘cri-RI-CQI’. Optionally, the CSI-related quantities being CRI and L1-RSRP means that the report quantity parameter is set / configured to ‘cri-RSRP’. Optionally, the CSI-related quantities being none means that the report quantity parameter is set / configured to ‘none’. Optionally, the CSI-related quantities including at least RI means that the CSI-related quantities may include at least one of the followings: CRI, RI, PMI, and CQI; CRI, RI, LI, PMI, and CQI; CRI, RI, and i1; CRI, RI, i1, and CQI; CRI, RI, and CQI.

[0193] For CSI acquisition (for example, for the acquisition of RI, PMI, CQI), parameters (for example, spatial domain parameters, power parameters, frequency domain parameters) of different cells may vary significantly. Therefore, method for configuring parameters respectively for different cells is provided below, so as to adapt to the transmission features of each cell, improving the accuracy of the CSI. One / each first CSI reporting configuration may be configured with / include / indicate / be associated with one or more first configuration information. Here, the number of one or more first configuration information may be L. Refer above for description of L. When the reported CSI-related quantities include at least RI, the L first configuration information may be configured. Configuration method for one / each first configuration information is discussed further below. Optionally, the first configuration information may include a parameter for CSI computation. Optionally, the first configuration information is used for CSI computation. Optionally, the first configuration information is used for CSI computation / CSI determination for the corresponding candidate cell. Optionally, the first configuration information is used for CSI computation / CSI determination for the corresponding LTM candidate configuration. Optionally, the first configuration information may be associated with / include / configured with at least one of the followings:

[0194] ● An LTM candidate configuration ID. Here, “LTM candidate configuration ID” may be used interchangeably with “candidate cell ID” or “ID of candidate configuration corresponding to candidate cell” or “candidate cell indication”, and its name is not limited by the application. Optionally, the LTM candidate configuration ID is used for indicating the LTM candidate configuration corresponding to the first configuration information. Optionally, the LTM candidate configuration ID is used for indicating the candidate cell corresponding to the first configuration information. Optionally, the LTM candidate configuration ID is used for identifying the candidate cell associated with the first configuration information. The first configuration information indicates the parameter for determining the CSI of the corresponding LTM candidate configuration. Optionally, the LTM candidate configuration ID may be used for indicating the candidate cell corresponding to / associated with the first CSI reporting configuration. Optionally, the LTM candidate configuration ID corresponding to the first configuration information may be determined implicitly. Optionally, the L first configuration information is mapped one-to-one to / corresponded one-to-one to the L candidate cells (or the L LTM candidate configuration IDs). Optionally, when the LTM candidate configuration ID is not configured, the L first configuration information is mapped with the L candidate cells. Optionally, the mapping of the L first configuration information to the L candidate cells is according to the ascending / descending order of the values of the LTM candidate configuration IDs corresponding to the L candidate cells. For example, the L first configuration information is: first configuration information #1, first configuration information #2, and first configuration information #3; and the LTM candidate configuration IDs corresponding to the L candidate cells are: LTM candidate configuration ID #2, LTM candidate configuration ID #1, and LTM candidate configuration ID #5, then, in ascending order, first configuration information #1 corresponds to LTM candidate configuration ID #1, first configuration information #2 corresponds to LTM candidate configuration ID #2, and first configuration information #3 corresponds to LTM candidate configuration ID #5. Optionally, the p-th first configuration information of the L first configuration information corresponds to candidate cell #p. Refer above for description of candidate cell #p. The description of the above method is also applicable to the description of the PCI, for example, replacing the LTM candidate configuration ID with the PCI. The above provides the method for determining the LTM candidate configuration / candidate cell associated with the first configuration information, so that the UE obtains the parameter corresponding to the candidate cell to compute the CSI, improving the accuracy of the CSI and improving the reliability of the communication system;

[0195] ● A reference signal resource for / corresponding to the first configuration information. The reference signal resource for / corresponding to the first configuration information may be K1 (K1≥1) reference signal resources. Optionally, the reference signal resource for / corresponding to the first configuration information is the reference signal resource in the resource set. Optionally, the reference signal resource for / corresponding to the first configuration information may be configured by the higher layer parameter included in the first configuration information. For example, the first configuration information indicates one or more reference signal resources for / corresponding to the first configuration information in the resource set. Optionally, the reference signal resource for / corresponding to the first configuration information may be determined based on the LTM candidate configuration ID associated with / corresponding to the first configuration information. For example, the reference signal resource for / corresponding to the first configuration information refers to the reference signal resource in the resource set whose value of the associated LTM candidate configuration ID is the same as the value of the LTM candidate configuration ID associated with / corresponding to the first configuration information. For example, if the first configuration information is associated with LTM candidate configuration ID #1, and the resource set includes CSI-RS #1, CSI-RS #2, and CSI-RS #3, these resources are associated with LTM candidate configuration ID #1, LTM candidate configuration ID #1, LTM candidate configuration ID #2, LTM candidate configuration ID #1 associated with CSI-RS #1 and CSI-RS #2 is the same as LTM candidate configuration ID #1 associated with the first configuration information, therefore, the reference signal resources for / corresponding to the first configuration information are CSI-RS #1 and CSI-RS #2. Optionally, the CSI associated with the reference signal resource for / corresponding to the first configuration information is determined based on the parameter / configuration indicated in the first configuration information. Optionally, the CSI associated with the reference signal resource refers to the CSI determined / computed based on the reference signal resource. Optionally, the CSI associated with the reference signal resource refers to the CSI determined / computed based on the measurement (or measurement result) of the reference signal resource. The above method allows the UE to obtain the reference signal corresponding to the candidate cell and use the corresponding reference signal to compute the CSI, improving the accuracy of the CSI and improving the reliability of the communication system;

[0196] ● A codebook parameter. The codebook parameter is the parameter used for configuring the codebook. The codebook parameter may be indicated by the parameter codebookConfig. Optionally, the codebook parameter is applicable to CSI computation / CSI determination associated with / corresponding to the first configuration information. Optionally, the codebook parameter is applicable to the reference signal resource associated with / corresponding to the first configuration information. Optionally, the codebook parameter may indicate the type of the codebook, or a codebook type parameter (e.g., codebookType). Optionally, the type of the codebook may be the Type-I codebook (for example, the corresponding codebook type parameter is set to ‘typeI’). Optionally, the type of the codebook may be the Type-I single-panel codebook (for example, the corresponding codebook type parameter is set to ‘typeISinglePanel’). Optionally, the type of the codebook may be the Type-I multi-panel codebook (for example, the corresponding codebook type parameter is set to ‘typeI-MultiPanel’). Optionally, the type of the codebook may be the Type-II codebook (for example, the corresponding codebook type parameter is set to ‘typeII’). Optionally, the codebook parameter may indicate at least one of the number of antenna ports in first dimension (N1) and / or the number of antenna ports in second dimension (N2) and / or and the number of antenna port groups (Ng). Here, the number of antenna ports in first dimension (N1) and / or the number of antenna ports in second dimension (N2) may correspond to / be associated with the dimension of antenna port of the codebook or the dimension of antenna port for precoding. For example, when the codebook type is the Type-I single-panel codebook or the codebook type is Type-II, the codebook parameter (e.g., the codebook configuration parameter) may indicate / configure / include the number of antenna ports in first dimension (N1) and / or the number of antenna ports in second dimension (N2). For example, when the codebook type is the Type-I multi-panel codebook, the codebook parameter (e.g., the codebook configuration parameter) may indicate / configure / include the number of antenna ports in first dimension (N1) and / or the number of antenna ports in second dimension (N2) and the number of antenna port groups (Ng). Optionally, the codebook parameter may indicate / configure / include a codebook subset restriction parameter. Optionally, the UE may determine the precoder that is not allowed or is allowed to be reported based on the codebook subset restriction parameter. Optionally, the UE may determine the PMI (corresponding to the precoder) that is not allowed or is allowed to be reported based on the codebook subset restriction parameter. Optionally, the codebook parameter may indicate a codebook mode (e.g., the parameter codebookMode). In different candidate cells, the arrangement of the antenna array is different in some cases, therefore, configuring the codebook parameters associated with the antenna array for different candidate cells may improve the accuracy of CSI acquisition, improving the performance of the communication system;

[0197] ● The port indication for non-PMI feedback. Optionally, the port indication may be indicated by the parameter non-PMI-PortIndication. Optionally, the port indication is used for RI / CQI computation. Optionally, the port indication for non-PMI feedback may be used for CSI computation / CSI determination associated with / corresponding to the first configuration information. In different candidate cells, the numbers and / or directions of beams of the antenna array may be different, therefore, configuring the port indication for non-PMI feedback associated with the number and rank of the beams for different candidate cells may improve the accuracy of CSI acquisition, improving the reliability of the communication system;

[0198] ● CQI table indication. Optionally, the port indication may be indicated by the parameter cqi-Table. Optionally, the CQI table indication may indicate the CQI table used for CQI computation associated with / corresponding to the first configuration information. Optionally, the CQI table indication may be used for CSI computation / CSI determination associated with / corresponding to the first configuration information. Different CQI table indications may be used for satisfying the scheduling requirements with different reliability. In different candidate cells, scheduling requirements are different in some cases, therefore, configuring corresponding CQI table indications for different candidate cells may improve the accuracy of CSI acquisition, improving the performance of the communication system;

[0199] ● The frequency domain configuration parameter. Optionally, the frequency domain configuration parameter may be indicated by reportFreqConfiguration. Optionally, the frequency domain configuration parameter may indicate the reporting granularity in the frequency domain of the CSI associated with the first configuration information. The reporting granularity in the frequency domain may be a subband or a wideband. The frequency domain granularity for CQI reporting and PMI reporting may be configured respectively. For example, the CQI reporting may be wideband CQI reporting or subband CQI reporting. For example, the PMI reporting may be wideband PMI reporting or subband PMI reporting. Optionally, the frequency domain configuration parameter may indicate a CSI reporting band. The CSI reporting band is associated with the CSI associated with / corresponding to the first configuration information. Optionally, the frequency domain configuration parameter may indicate the frequency domain granularity and / or the CSI reporting band of the CSI corresponding to the first configuration information. Optionally, the frequency domain configuration parameter may be used for CSI computation / CSI determination associated with / corresponding to the first configuration information. In different candidate cells, the frequency points of the cells are different in some cases, therefore, configuring corresponding frequency domain configurations for different candidate cells may improve the accuracy of CSI acquisition, improving the performance of the communication system;

[0200] ● The number of reported reference signals. The number of the reported reference signals may be the number of the reference signals reported in the CSI associated with / corresponding to the first configuration information. Optionally, the reported reference signal may be the reference signal reported in a report instance. The reported reference signals may be the CSI associated with the reported K2 reference signals, or the CSI determined based on the measurement of the reported K2 reference signals. For example, K2 may be the number of the CRIs reported in the CSI associated with / corresponding to the first configuration information. In different candidate cells, the numbers of corresponding reference signal resources are different in some cases, therefore, configuring the corresponding numbers of the reported reference signals for different candidate cells increases the flexibility of CSI reporting, improving the performance of the communication system;

[0201] ● The aperiodic triggering offset parameter. The aperiodic triggering offset parameter may be the aperiodic triggering offset parameter of the CSI-RS resource corresponding to the candidate cell associated with / corresponding to the first configuration information.

[0202] One / each first CSI reporting configuration may be configured with / include / indicate / be associated with the number of cells. Optionally, the cell may be the candidate cell. Optionally, the number of the cells may be indicated by the parameter nrOfReportedCells. Optionally, the number of the cells may be the number of reported cells. Optionally, the reported cell may be the CSI associated with the reported cell. Optionally, the number of the reported cells may be the number of the reported cells in a report instance.

[0203] One / each first CSI reporting configuration may be configured with / include / indicate / be associated with the number of the reported reference signals of each cell. Here, the cell may be the candidate cell. Optionally, the reported reference signal may be the reference signal reported in a report instance. The reported reference signal may be the CSI associated with the reported reference signal of each of the reported cells, or the reported CSI determined based on the measurement of the reported reference signal of each of the reported cells.

[0204] One / each first CSI reporting configuration may be configured with / include / indicate / be associated with a special cell indication. Optionally, the special cell indication may be indicated by the parameter spCellInclusion. Optionally, the special cell indication may indicate whether the UE includes the CSI report associated with the current SpCell. Optionally, the special cell indication may indicate whether the UE excludes the CSI report associated with the current SpCell. Optionally, the indication for excluding the current special cell may be indicated by the parameter spCellInclusion, or by one other parameter. In the disclosure, the term “whether to exclude” may be used interchangeably with the term “whether not to include”. Here, the special cell may be the current special cell.

[0205] The configuration method of the second CSI reporting configuration is discussed below. Optionally, the method for configuring the first CSI reporting configuration may be used for the configuration of the second CSI reporting configuration. Optionally, the second CSI reporting configuration is the CSI reporting configuration for LTM. Optionally, the second CSI reporting configuration may be the CSI reporting configuration for beam management of the LTM. Optionally, the report quantity corresponding to the second CSI reporting configuration may include at least one of CRI, SSBRI, L1-RSRP, and L1-SINR.

[0206] A first CSI reporting configuration may be configured with / include / indicate / be associated with L cells. Refer above for the determination method of the L cells. Optionally, the UE determines and / or reports the CSI of one or more cells. Optionally, the UE determines and / or reports the CSI of the one or more cells based on the first CSI reporting configuration. Optionally, the CSI of the one or more cells is reported in a single report instance. Here, the cell may be the LTM candidate cell. Optionally, the UE may report the CSI of N (1≤N≤L) candidate cells. Optionally, the UE may report the CSI of N (1≤N≤L) candidate cells of the L candidate cells. Here, the CSI of the candidate cell refers to the CSI determined / computed based on the configuration information (for example, the first configuration information) of the corresponding candidate cell. Optionally, the CSI of one candidate cell may include Krep (Krep≥1) groups of CSI, where each group of CSI includes at least one of CRI, PMI, RI, CQI, LI. Optionally, in the Krep (Krep≥1) groups of CSI, CRIs included in each group of CSI are different. Optionally, in the Krep (Krep≥1) groups of CSI, CSI-RS resources corresponding to each group of CSI are different. Optionally, Krep may be predefined. Krep may be the number of the reported reference signals. For example, Krep may be one of 1, 2, 3, 4. Optionally, Krep may be indicated by the first configuration information corresponding to the candidate cell. Optionally, Krep may be indicated by the first CSI reporting configuration. Optionally, Krep may be determined / selected by the UE. The CSI-RS resources corresponding to the Krep groups of CSI may be the CRIs corresponding to the Krep groups of CSI.

[0207] The determination of N is discussed below. In some cases, for example, when the CSI report is a periodic CSI report, N=L. In some cases, for example, when the N candidate cells exclude (or do not include) the current special cell, N=L-l. Optionally, N may be determined by at least one of the followings:

[0208] ● Indication of the first CSI reporting configuration. Optionally, the first CSI reporting configuration includes a parameter indicating the number of the cells; where N is indicated by the parameter for indicating the number of the cells. Optionally, the first CSI reporting configuration includes a parameter indicating the number of the reported cells; where N is indicated by the parameter indicating the number of the reported cells;

[0209] ● Indication of MAC-CE or indication of DCI. Optionally, N may be indicated by the trigger state corresponding to / associated with the first CSI reporting configuration indicated by MAC-CE or DCI;

[0210] ● N is determined / indicated by the UE. Optionally, the UE determines / selects the N cells from the L cells;

[0211] ● N is less than or equal to J, where J is indicated by the capability reported by the UE.

[0212] The above method defines the determination method of N, so that the UE selects the best N candidate cells of the L candidate cells, saving the signaling overhead of the reporting.

[0213] Optionally, the UE may be configured with the second CSI reporting configuration. The UE may transmit the CSI report corresponding to the second CSI reporting configuration.

[0214] ● Optionally, the second CSI reporting configuration is used for LTM. Optionally, the second CSI reporting configuration is used for the beam reporting. Optionally, the CSI report corresponding to the second CSI reporting configuration includes a resource indicator (for example, CRI / SSBRI) and L1-RSRP (corresponding to the resource indicator). Optionally, the CSI report corresponding to the second CSI reporting configuration includes a resource indicator (for example, CRI / SSBRI) and L1-SINR (corresponding to the resource indicator). The report quantity corresponding to the second CSI reporting configuration is CRI / SSBRI and L1-RSRP / L1-SINR. Optionally, the resource indicator included in the CSI report corresponding to the second CSI reporting configuration may be the resource indicator corresponding to the largest (measured) L1-RSRP.

[0215] ● Optionally, the UE determines the N candidate cells based on the candidate cell associated with the resource indicator included in the CSI report corresponding to the second CSI reporting configuration. Optionally, the N candidate cells are determined based on candidate cell associated with the resource indicator included in the CSI report corresponding to the second CSI reporting configuration. Optionally, the resource indicator included in the CSI report corresponding to the second CSI reporting configuration is associated with Q (Q≥1) candidate cells. Optionally, the resource indicator (corresponding to the largest measured L1-RSRP) included in the CSI report corresponding to the second CSI reporting configuration is associated with first candidate cells. Optionally, the N candidate cells refer to the intersection of the L candidate cells and the Q candidate cells. Optionally, the N candidate cells refer to the intersection of the L candidate cells and the first candidate cells.

[0216] ■ Optionally, the UE may determine whether to drop the CSI report based on the CSI report corresponding to the second CSI reporting configuration. Optionally, the UE may determine whether to drop the CSI report based on the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration. Optionally, the UE may determine whether to drop the CSI report based on whether the candidate cells corresponding to the resource indicators indicated by the CSI report corresponding to the second CSI reporting configuration are the L candidate cells. Optionally, the UE may determine whether to report the CSI report based on whether the candidate cells corresponding to the resource indicators indicated by the CSI report corresponding to the second CSI reporting configuration are the L candidate cells. Optionally, when the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration is different from the L candidate cells, the UE drops the CSI report. Optionally, when L=1, when the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration is different from the L candidate cells, the UE drops the CSI report. Optionally, when the intersection is empty, the UE does not report the CSI report corresponding to the first CSI reporting configuration. Optionally, the intersection being empty may be understood as the L candidate cells not including the Q candidate cells, or the L candidate cells not including any one of the Q candidate cells, or the Q candidate cells not including the L candidate cells, or the Q candidate cells not including any one of the L candidate cells, or the L candidate cells not including the first candidate cells, or the L candidate cells being different from the Q candidate cells, or the L candidate cells being different from any one of the Q candidate cells, or the Q candidate cells being different from the L candidate cells, or the Q candidate cells being different from any one of the L candidate cells, or the L candidate cells being different from the first candidate cells. Optionally, the method is applicable to the case of periodic or semi-persistent CSI reporting. The method can cancel the reporting when the L candidate cells are not indicated by the previous LTM beam management reporting, saving the energy consumption of the UE and improving the efficiency of the communication system. Optionally, the method / function (of determining whether to report the CSI report corresponding to the first CSI reporting configuration based on the indication of the CSI report corresponding to the second CSI reporting configuration) may be enabled or disabled. For example, the method / function may be enabled or disabled by the indication from the base station. For example, the first CSI reporting configuration indicates that the method / function is enabled or disabled. For example, the method / function may be enabled or enabled by the UE capability reporting. For example, the UE reports UE capability signaling to indicate that the method / function is enabled or disabled. When the method / function is enabled, the UE determines whether to report the CSI report corresponding to the first CSI reporting configuration based on the indication of the CSI report corresponding to the second CSI reporting configuration. In the disclosure, not reporting the CSI report may be cancelling the CSI report, or dropping the CSI report, or not performing the CSI report.

[0217] ■ Optionally, the CSI report corresponding to the second CSI reporting configuration refers to the CSI report before the CSI report corresponding to the first CSI reporting configuration. Optionally, the CSI report corresponding to the second CSI reporting configuration refers to the latest CSI report before the CSI report corresponding to the first CSI reporting configuration. For example, the CSI corresponding to the first CSI reporting configuration is reported in slot n. The CSI report corresponding to the second CSI reporting configuration is the report before slot n. The CSI report corresponding to the second CSI reporting configuration is the latest report relative to slot n. Due to the time domain correlation for channel state, the CSI report closer in time domain can better reflect the channel state. The method can ensure that the CSI report corresponding to the second CSI reporting configuration is the CSI report with a closer distance in time domain, so that the UE may use accurate information to decide whether to report, thereby improving the performance of the communication system.

[0218] ■ Optionally, the CSI report corresponding to the second CSI reporting configuration may be the CSI report corresponding to the second CSI reporting configuration corresponding to a specific CSI reporting configuration ID. Optionally, the specific CSI reporting configuration ID may be indicated by the base station (for example, via higher layer parameter).

[0219] The determination method of the N candidate cells is discussed below. Optionally, the N candidate cells may be selected / determined based on at least one of the followings:

[0220] ● The corresponding L1 quantity of the candidate cell. For example, the L1 quantities corresponding to the N candidate cells are the N candidate cells with the highest / lowest L1 quantity of the L candidate cells. Optionally, the L1 quantity corresponding to the candidate cell is determined / measured based on the reference signal corresponding to the candidate cell. Optionally, the L1 quantity may refer to the measured quantity. Optionally, the L1 quantity may be the quantity obtained based on reference signal measurement. If a candidate cell corresponds to multiple L1 quantities of multiple reference signals, then the L1 quantity corresponding to the candidate cell is the highest / lowest quantity thereof. Here, the highest / lowest L1 quantity refers to the highest / lowest L1 quantity value. Optionally, the L1 quantity may be at least one of L1-RSRP, L1-SINR, and CQI. Through the method, the UE may measure the reference signal to obtain the specific L1 quantity, and then determine the cell with better channel quality based on the L1 quantity, and report the CSI of the corresponding cell, the CSI that is more likely to be used is screened out, so that the base station can obtain the cell with better channel quality for subsequent scheduling, improving the efficiency of the communication system;

[0221] ● Whether the candidate cells do not include the current special cell, or whether the candidate cells exclude the current special cell. Whether the candidate cells do not include (or exclude) the current special cell may be indicated by the base station (for example, indicated by the first CSI reporting configuration). Optionally, the N candidate cells do not include the current special cell. Optionally, the N candidate cells exclude the current special cell. Optionally, the N candidate cells excluding (or not including) the current special cell means that the CSI of the N candidate cells does not include the CSI of the candidate cell corresponding to the current special cell. Optionally, the N candidate cells excluding (or not including) the current special cell means that the CSI of the N candidate cells does not include the CSI of the reference signal resource associated with the current special cell. Optionally, the N candidate cells excluding (or not including) the current special cell means that the CSI of the N candidate cells does not include the CSI of the reference signal resource associated with the current special cell. Since the CSI acquisition for candidate cells is for scheduling after cell switch, and the CSI of the current cell can be obtained through CSI reporting for non-LTM in some cases, the current cell of the L candidate cells can be excluded from the N cells, and the CSI that is more likely to be used is screened out, so that the UE can report more CSI of other non-current special cell, improving the efficiency of the communication system;

[0222] ● Whether the candidate cells include the current special cell. Whether the candidate cells include the current special cell may be indicated by the base station (e.g., indicated by the first CSI reporting configuration). Optionally, the N candidate cells include the current special cell. Optionally, the N candidate cells including the current special cell means that the CSI of the N candidate cells includes the CSI of the candidate cell corresponding to the current special cell. Optionally, the N candidate cells including the current special cell means that the CSI of the N candidate cells includes the CSI of the reference signal resource associated with the current special cell;

[0223] ● The CSI report corresponding to the second CSI reporting configuration. Optionally, the N candidate cells may be the candidate cells associated with the resource indicated by the CSI report. Optionally, the N candidate cells may be the candidate cells associated with the indicator (e.g., CRI / SSBRI) indicated by / included in the CSI report. Optionally, the N candidate cells are determined based on the candidate cells associated with the reference signal resource corresponding to the indicator (for example, CRI / SSBRI) indicated by the CSI report. Optionally, the resource (or the resource to which the indicator corresponds) is the resource with the highest L1-RSRP (e.g., measured L1-RSRP). For example, if the CRI included in the CSI report corresponds to CSI-RS resource #1 associated with LTM candidate configuration ID #1, then the N candidate cells include the candidate cells corresponding to LTM candidate configuration ID #1. Through the method, the UE may determine the cell with better channel quality through other CSI report, and report the CSI of the corresponding cell, the CSI that is more likely to be used is screened out, so that the base station can obtain the CSI of the cell with better channel quality for subsequent scheduling, improving the efficiency of the communication system.

[0224] The above method enables the UE and the base station to have the same understanding of the reported CSI associated with the N candidate cells, improving the reliability of the communication system.

[0225] Optionally, the UE may determine whether to report based on the L candidate cells. Optionally, the UE may determine whether to drop the CSI report based on the L candidate cells. Optionally, the UE may determine whether to drop the CSI report based on whether the L candidate cells are the current special cell. Optionally, when the L candidate cells are not the current special cell, the UE reports the CSI report. Optionally, when the L candidate cells are the current special cell, the UE drops the CSI report. Optionally, when L=1, it may be considered that the first CSI reporting configuration corresponds to a candidate cell (for example, the candidate cell indicated by the first configuration information). Optionally, when the candidate cell corresponding to the first CSI reporting configuration is the current special cell, the UE drops the CSI report; and / or when the candidate cell corresponding to the first CSI reporting configuration is not the current special cell, the UE reports the CSI report. Optionally, the CSI reporting refers to the CSI report corresponding to the first CSI reporting configuration. Refer above for description of the L candidate cells. Optionally, the method / function (of determining whether to report the CSI report corresponding to the first CSI reporting configuration based on the L candidate cells) may be enabled or disabled. For example, the method / function may be enabled or disabled by the indication from the base station. For example, the indication to exclude the current special cell may enable or disable the method / function. For example, if the current special cell is excluded, the method is enabled; otherwise, the method is disabled. For example, the first CSI reporting configuration indicates that the method / function is enabled or disabled. For example, the method / function may be enabled or disabled by the UE capability reporting. For example, the UE reports the UE capability signaling to indicate that the method / function is enabled or disabled. When the method / function is enabled, the UE determines whether to report the CSI report corresponding to the first CSI reporting configuration based on the candidate cell corresponding to the first CSI reporting configuration. Optionally, generally, the CSI report corresponding to the first CSI reporting configuration is a periodic CSI report. Optionally, when the L candidate cells are the current special cell and the CSI report corresponding to the first CSI reporting configuration is a periodic CSI report, the UE drops the CSI report corresponding to the first CSI reporting configuration. For example, when the candidate cell corresponding to the first CSI reporting configuration is the current special cell and the CSI report corresponding to the first CSI reporting configuration is a periodic CSI report, the UE drops the CSI report corresponding to the first CSI reporting configuration. Since periodic CSI report is configured via RRC signaling, its reporting behavior cannot be adjusted following the current special cell of L1 / L2 signaling, therefore, the method may allow the stop of the corresponding CSI report in time when the candidate cell corresponding to the periodic CSI report is switched to the current special cell, reducing the reporting overhead and improving the efficiency and energy consumption of the UE. In the disclosure, not reporting the CSI report may be cancelling the CSI report, or dropping the CSI report, or not performing the CSI report.

[0226] Optionally, the reference signal resource associated with the current special cell in the resource set may be the reference signal resource having the PCI and center frequency point same as the PCI and center frequency point of the SSB of the current special cell. Here, the SSB may be a cell-defining SSB. The PCI of the reference signal resource refers to the PCI of the candidate cell associated with / corresponding to the reference signal resource (or the PCI corresponding to the LTM candidate configuration ID associated with / corresponding to the candidate cell associated with / corresponding to the reference signal resource). The center frequency point of the reference signal resource is determined based on the frequency domain information with which the reference signal resource is configured.

[0227] Optionally, the candidate cell corresponding to / associated with the special cell refers to the candidate cell having the PCI and center frequency point same as the PCI and center frequency point of the SSB of the current special cell. Here, the SSB may be a cell-defining SSB. The PCI of the candidate cell refers to the PCI of the candidate cell (or the PCI corresponding to the LTM candidate configuration ID associated with / corresponding to the candidate cell). The center frequency point of the candidate cell is determined based on the frequency domain information of the reference signal associated with the candidate cell. Optionally, the reference signal associated with the candidate cell refers to the reference signal configured by the configuration information of the CSI-RS resource for LTM. Optionally, the reference signal resource associated with the candidate cell refers to the reference signal associated with the SSB configuration information for LTM.

[0228] Optionally, the candidate cell not corresponding to / not associated with the special cell refers to the candidate cell having the PCI and / or center frequency point different from the PCI and center frequency point of the SSB of the current special cell.

[0229] In the disclosure, corresponding to / being associated with the special cell may be corresponding to / being associated with the current special cell. Not corresponding to / not associated with the special cell may be not corresponding to / not associated with the current special cell. The non-current special cell may be referred to as a non-special cell.

[0230] Krep is discussed below. Optionally, the CSI-RS resources corresponding to the Krep groups of CSI (or Krep CSI-RS resources, or Krep CRIs) are selected / determined based on at least one of the followings:

[0231] ● The L1 quantity corresponding to the CSI-RS resource. For example, the Krep CSI-RS resources are the Krep reference signal resources with the corresponding L1 quantity being the highest / lowest of the reference signal resources corresponding to the candidate cell. Optionally, the L1 quantity corresponding to the reference signal resource is determined / measured based on the reference signal. Optionally, the L1 quantity may refer to the measured quantity. Optionally, the L1 quantity may be the quantity obtained based on reference signal measurement. Here, the L1 quantity being the highest / lowest means that the valued of the L1 quantity is the highest / lowest. Optionally, the L1 quantity may be at least one of L1-RSRP, L1-SINR, and CQI. Through the method, the UE may measure the reference signal to obtain the specific L1 quantity, and then determine the reference signal resource with better channel quality through the L quantity, and report the CSI of the corresponding cell, the CSI that is more likely to be used is screened out, so that the base station obtains the CSI of the cell with better channel quality for subsequent scheduling, improving the efficiency of the communication system;

[0232] ● The resource corresponding to the resource indicator indicated by / included in the CSI report corresponding to the second CSI reporting configuration. The candidate cells associated with the resources corresponding to the resource indicators indicated by / included in the CSI report corresponding to the second CSI reporting configuration are the same as the candidate cells associated with the Krep CSI-RS resources corresponding to the Krep groups of CSI. Optionally, the Krep CSI-RS resources include / may be the resources indicated by the CSI report. Optionally, the Krep CSI-RS resources may include the resources corresponding to the indicators (e.g., CRI / SSBRI) indicated by / included in the CSI report. Optionally, the Krep CSI-RS resources may include the reference signal resources that are quasi co-located with the reference signal resources corresponding to the indicators (e.g., CRI / SSBRI) indicated by / included in the CSI report. For example, if the CRI included in the CSI report corresponds to CSI-RS resource #1 associated with LTM candidate configuration ID #1, then the Krep CSI-RS resources associated with LTM candidate configuration ID #1 include CSI-RS resource #1. Refer below for the features of the second CSI reporting configuration and the CSI report corresponding to the second CSI reporting configuration. Refer to the configuration method of the first CSI reporting configuration for the configuration method of the second CSI reporting configuration. Through the method, the UE may determine the cell with better channel quality through other CSI report, report the CSI of the corresponding cell, the CSI that is more likely to be used is screened out, so that the base station obtain the CSI of the cell with better channel quality for subsequent scheduling, improving the efficiency of the communication system.

[0233] Method of determining the CRI in the CSI of the candidate cell is discussed below. Optionally, the CRI in the CSI of the candidate cell may be determined based on all reference signal resources in the resource set, or based on the reference signal resource corresponding to the candidate cell.

[0234] ● Optionally, when the N candidate cells do not exclude the current special cell and / or N=L and / or k1>1, the value k1 (0≤k1≤K1-1) of the CRI in the CSI of the candidate cell corresponds to the (k1+1)-th CSI-RS resource corresponding to the candidate cell; where K1 refers to the number of the CSI-RS resources corresponding to the candidate cell. Optionally, the bitwidth of the CSI field corresponding to the CRI is determined based on K1. The bitwidth of the CSI field corresponding to the CRI is equal to . The method enables the UE to use the number of the reference signal resources corresponding to the candidate cell to determine the CRI under the specific condition, saving the signaling overhead compared with using all resources in the resource set to determine the CRI.

[0235] ● Optionally, when the N candidate cells do not exclude the current special cell and / or N=L and / or K1=1, the CRI is not included in the CSI of the candidate cell; where K1 refers to the number of the CSI-RS resources corresponding to the candidate cell. Optionally, the bitwidth of the CSI field corresponding to the CRI is determined based on K1. The bitwidth of the CSI field corresponding to the CRI is equal to . The method enables the UE to use the number of the reference signal resources corresponding to the candidate cell to determine the CRI under the specific condition, saving the signaling overhead compared with using all resources in the resource set to determine the CRI.

[0236] ● Optionally, when the N candidate cells do not exclude the current special cell and / or N<L, the value k2 (0≤k2≤K-1) of the CRI in the CSI of the candidate cell corresponds to the (k2+1)-th CSI-RS resource in the resource set. Optionally, the bitwidth of the CSI field corresponding to the CRI is determined based on K. The bitwidth of the CSI field corresponding to the CRI is equal to .K is described above.

[0237] ● Optionally, when the N candidate cells exclude the current special cell and / or N=L-1 and / or K1>1, the value k1 (0≤k1≤K1-1) of the CRI in the CSI of the candidate cell corresponds to the (k1+1)-th CSI-RS resource corresponding to the candidate cell; where K1 refers to the number of the CSI-RS resources corresponding to the candidate cell. Optionally, the bitwidth of the CSI field corresponding to the CRI is determined based on K1. The bitwidth of the CSI field corresponding to the CRI is equal to .The method enables the UE to use the number of the reference signal resources corresponding to the candidate cell to determine the CRI under the specific condition, saving the signaling overhead compared with using all resources in the resource set to determine the CRI.

[0238] ● Optionally, when the N candidate cells exclude the current special cell and / or N=L-1 and / or K1=1, the CRI is not included in the CSI of the candidate cell; where K1 refers to the number of the CSI-RS resources corresponding to the candidate cell. Optionally, the bitwidth of the CSI field corresponding to the CRI is determined based on K1. The bitwidth of the CSI field corresponding to the CRI is equal to . The method enables the UE to use the number of the reference signal resources corresponding to the candidate cell to determine the CRI under the specific condition, saving the signaling overhead compared with using all resources in the resource set to determine the CRI.

[0239] ● Optionally, when the N candidate cells exclude the current special cell and / or N<L-1, the value k2 (0≤k2≤K-1) of the CRI in the CSI of the candidate cell corresponds to the (k2+l)-th CSI-RS resource in the resource set. Optionally, the bitwidth of the CSI field corresponding to the CRI is determined based on K. The bitwidth of the CSI field corresponding to the CRI is equal to . K is described above. The method allows the UE to obtain the reference signal of the corresponding candidate cell through the CRI under the specific condition and compute the CSI accordingly, improving the accuracy of the CSI and improving the reliability of the communication system.

[0240] The above method defines the determination method of the CRI in the CSI of the candidate cell, so that the UE and the base station have the same understanding of the CRI, improving the reliability of the communication system.

[0241] The method of determining the mapping order of the CSI of the N candidate cells is discussed below. Optionally, the mapping order of the CSI of the N candidate cells is determined based on the order of the N candidate cells and / or the order of the values of the LTM candidate configuration IDs corresponding to the N candidate cells and / or whether the candidate cell is the special cell.

[0242] Optionally, (if the N candidate cells include the candidate cell corresponding to the current special cell,) the CSI of the candidate cells of the N candidate cells not corresponding to the special cell is before / after the CSI of the candidate cell of the N candidate cells corresponding to the special cell; and / or the mapping order of the CSI of the candidate cells of the N candidate cells not corresponding to the special cell is determined based on the ascending / descending order of the values of the LTM candidate configuration IDs corresponding to the candidate cells. For example, the N candidate cells are candidate cell #1 (associated with LTM candidate configuration ID #1, special cell), candidate cell #2 (associated with LTM candidate configuration ID #2, non-special cell), candidate cell #3 (associated with LTM candidate configuration ID #3, non-special cell), the mapping order of the N candidate cells is the CSI of candidate cell #2, the CSI of candidate cell #3, the CSI of candidate cell #1. The CSI of the candidate cell may be the Krep groups of CSI of the candidate cell.

[0243] Optionally, (if the N candidate cells do not include the candidate cell corresponding to the current special cell,) the mapping order of the CSI of the N candidate cells is determined based on the ascending / descending order of the values of the LTM candidate configuration IDs corresponding to the candidate cells.

[0244] Optionally, the CSI report associated with / corresponding to the first CSI reporting configuration may include CSI Part 1 and CSI Part 2. Optionally, CSI Part 2 may include CSI Part 2 wideband and CSI Part 2 subband. CSI Part 2 wideband refers to the wideband CSI in CSI Part 2. CSI Part 2 subband refers to the subband CSI in CSI Part 2.

[0245] Optionally, in CSI Part 1, (when the N candidate cells include the candidate cell corresponding to the special cell,) the mapping order of the CSI of the N candidate cells is as follows (from beginning to end / from end to beginning):

[0246] ● The CSI of candidate cell #1 not corresponding to the special cell;

[0247] ● The CSI of candidate cell #2 not corresponding to the special cell;

[0248] ● …

[0249] ● The CSI of candidate cell #N-1 not corresponding to the special cell;

[0250] ● CSI of the candidate cell corresponding to the special cell.

[0251] Optionally, in CSI Part 1, (when the N candidate cells do not include the candidate cell corresponding to the special cell,) the mapping order of the CSI of the N candidate cells is as follows (from beginning to end / from end to beginning):

[0252] ● The CSI of candidate cell #1;

[0253] ● The CSI of candidate cell #2;

[0254] ● …

[0255] ● The CSI of candidate cell #N.

[0256] Optionally, in CSI Part 2 subband (when the N candidate cells include the candidate cell corresponding to the special cell,) the mapping order of the CSI of the N candidate cells is as follows (from beginning to end / from end to beginning):

[0257] ● The CSI of even subbands of candidate cell #1 not corresponding to the special cell;

[0258] ● The CSI of odd subbands of candidate cell #1 not corresponding to the special cell;

[0259] ● The CSI of even subbands of candidate cell #2 not corresponding to the special cell;

[0260] ● The CSI of odd subbands of candidate cell #2 not corresponding to the special cell;

[0261] ● …

[0262] ● The CSI of even subbands of candidate cell #N-1 not corresponding to the special cell;

[0263] ● The CSI of odd subbands of candidate cell #N-1 not corresponding to the special cell;

[0264] ● The CSI of even subbands of the candidate cell corresponding to the special cell;

[0265] ● The CSI of odd subbands of the candidate cell corresponding to the special cell.

[0266] Optionally, in CSI Part 2 subband (when the N candidate cells include the candidate cell corresponding to the special cell,) the mapping order of the CSI of the N candidate cells is as follows (from beginning to end / from end to beginning):

[0267] ● The CSI of even subbands of candidate cell #1 not corresponding to the special cell;

[0268] ● The CSI of even subbands of candidate cell #2 not corresponding to the special cell;

[0269] ● …

[0270] ● The CSI of even subbands of candidate cell #N-1 not corresponding to the special cell;

[0271] ● The CSI of even subbands of the candidate cell corresponding to the special cell;

[0272] ● The CSI of odd subbands of candidate cell #1 not corresponding to the special cell;

[0273] ● The CSI of odd subbands of candidate cell #2 not corresponding to the special cell;

[0274] ● …

[0275] ● The CSI of odd subbands of candidate cell #N-1 not corresponding to the special cell;

[0276] ● The CSI of odd subbands of the candidate cell corresponding to the special cell.

[0277] Optionally, in CSI Part 2 subband (when the N candidate cells do not include the candidate cell corresponding to the special cell,) the mapping order of the CSI of the N candidate cells is as follows (from beginning to end / from end to beginning):

[0278] ● The CSI of even subbands of candidate cell #1;

[0279] ● The CSI of odd subbands of candidate cell #1;

[0280] ● The CSI of even subbands of candidate cell #2;

[0281] ● The CSI of odd subbands of candidate cell #2;

[0282] ● …

[0283] ● The CSI of even subbands of candidate cell #N;

[0284] ● The CSI of odd subbands of candidate cell #N.

[0285] Optionally, in CSI Part 2 subband (when the N candidate cells do not include the candidate cell corresponding to the special cell,) the mapping order of the CSI of the N candidate cells is as follows (from beginning to end / from end to beginning):

[0286] ● The CSI of even subbands of candidate cell #1;

[0287] ● The CSI of even subbands of candidate cell #2;

[0288] ● …

[0289] ● The CSI of even subbands of candidate cell #N;

[0290] ● The CSI of odd subbands of candidate cell #1;

[0291] ● The CSI of odd subbands of candidate cell #2;

[0292] ● …

[0293] ● The CSI of odd subbands of candidate cell #N.

[0294] Optionally, the value of the LTM candidate configuration ID corresponding to candidate cell #1 is the smallest, the value of the LTM candidate configuration ID corresponding to candidate cell #2 is the second smallest, and so on. Optionally, the value of the LTM candidate configuration ID corresponding to candidate cell #n is the n-th smallest. Optionally, in the CSI report, the q-th (1≤q≤N) candidate cell of the N candidate cells corresponds to the LTM candidate configuration ID with the q-th smallest (or the q-th largest) value of the LTM candidate configuration IDs (for example, different LTM candidate configuration IDs). The q-th candidate cell of the N candidate cells may be referred to as candidate cell #q. Optionally, in the CSI report, the r-th (1≤r≤N) candidate cell of the N-1 candidate cells corresponds to the LTM candidate configuration ID with the r-th smallest (or the r-th largest) value of the LTM candidate configuration IDs (for example, different LTM candidate configuration IDs). The r-th candidate cell of the N-1 candidate cells may be referred to as candidate cell #r.

[0295] The above method defines the mapping order of the CSI, so that the UE can assemble CSI information bits based on the correct mapping order, avoiding the reporting of erroneous CSI and improving the reliability of the communication system. In some cases, since the CSI corresponding to the current special cell can be obtained through non-LTM CSI reporting, the priority of the CSI of the non-special cell is more useful than the CSI of the special cell, and the above method may enable the order of the CSI of the non-special cell to be earlier than the CSI of the special cell, thereby preventing the preferential omission of the CSI of the non-special cell and improving the reliability of the communication system.

[0296] In some cases, the UE may transmit UCI information (including CSI) in PUSCH or PUCCH. When the payload of UCI (including CSI) that needs to be transmitted is too large to exceed the upper limit of the capacity of the (configured / allowed) channel, the UE can omit or not transmit some CSI bits based on priority, therefore, while ensuring the reliability of uplink transmission, as much high-priority CSI as possible is transmitted to the base station, improving the efficiency of the communication system. Method of CSI omission (for example, the CSI omission method when the CSI report includes CSIs associated with N resources) is described below. Optionally, the omission of the CSI of the N candidate cells is performed at candidate cell level. The UE performs the CSI omission in order of priorities from low to high. Optionally, the priorities of the CSI of the N candidate cells are determined based on the values of the LTM candidate configuration IDs corresponding to the N candidate cells and / or whether the candidate cell is the special cell.

[0297] Optionally, (if the N candidate cells include the candidate cell corresponding to the current special cell,) the priority of the CSI of the candidate cell not corresponding to the special cell of the N candidate cells is higher / lower than the priority of the CSI of the candidate cell corresponding to the special cell of the N candidate cells; and the priorities of the CSI of the candidate cells not corresponding to the special cell of the N candidate cells are determined based on the ascending / descending order of the values of the LTM candidate configuration IDs corresponding to the candidate cells. For example, the N candidate cells are candidate cell #1 (associated with LTM candidate configuration ID #1, special cell), candidate cell #2 (associated with LTM candidate configuration ID #2, non-special cell), candidate cell #3 (associated with LTM candidate configuration ID #3, non-special cell), the priorities of the N candidate cells (from high to low) are the CSI of candidate cell #2, the CSI of candidate cell #3, the CSI of candidate cell #1. The CSI of the candidate cell may be the Krep groups of CSI of the candidate cell.

[0298] Optionally, (if the N candidate cells do not include the candidate cell corresponding to the current special cell,) the priorities of the CSI of the N candidate cells are determined based on the ascending / descending order of the values of the LTM candidate configuration IDs corresponding to the candidate cells.

[0299] Optionally, the CSI report associated with / corresponding to the first CSI reporting configuration may include CSI Part 1 and CSI Part 2. Optionally, CSI Part 2 may include CSI Part 2 wideband and CSI Part 2 subband. CSI Part 2 wideband refers to the wideband CSI in CSI Part 2. CSI Part 2 subband refers to the subband CSI in CSI Part 2.

[0300] Optionally, in CSI Part 1, (when the N candidate cells include the candidate cell corresponding to the special cell,) the priorities of the CSI of the N candidate cells (from high to low / from low to high) are as follows:

[0301] ● The CSI of candidate cell #1 not corresponding to the special cell;

[0302] ● The CSI of candidate cell #2 not corresponding to the special cell;

[0303] ● …

[0304] ● The CSI of candidate cell #N-1 not corresponding to the special cell;

[0305] ● CSI of the candidate cell corresponding to the special cell.

[0306] Optionally, in CSI Part 1, (when the N candidate cells do not include the candidate cell corresponding to the special cell,) the priorities of the CSI of the N candidate cells (from high to low / from low to high) are as follows:

[0307] ● The CSI of candidate cell #1;

[0308] ● The CSI of candidate cell #2;

[0309] ● …

[0310] ● The CSI of candidate cell #N.

[0311] Optionally, in CSI Part 2 subband (when the N candidate cells include the candidate cell corresponding to the special cell,) the priorities of the CSI of the N candidate cells (from high to low / from low to high) are as follows:

[0312] ● The CSI of even subbands of candidate cell #1 not corresponding to the special cell;

[0313] ● The CSI of odd subbands of candidate cell #1 not corresponding to the special cell;

[0314] ● The CSI of even subbands of candidate cell #2 not corresponding to the special cell;

[0315] ● The CSI of odd subbands of candidate cell #2 not corresponding to the special cell;

[0316] ● …

[0317] ● The CSI of even subbands of candidate cell #N-1 not corresponding to the special cell;

[0318] ● The CSI of odd subbands of candidate cell #N-1 not corresponding to the special cell;

[0319] ● The CSI of even subbands of the candidate cell corresponding to the special cell;

[0320] ● The CSI of odd subbands of the candidate cell corresponding to the special cell.

[0321] Optionally, in CSI Part 2 subband (when the N candidate cells include the candidate cell corresponding to the special cell,) the priorities of the CSI of the N candidate cells (from high to low / from low to high) are as follows:

[0322] ● The CSI of even subbands of candidate cell #1 not corresponding to the special cell;

[0323] ● The CSI of even subbands of candidate cell #2 not corresponding to the special cell;

[0324] ● …

[0325] ● The CSI of even subbands of candidate cell #N-1 not corresponding to the special cell;

[0326] ● The CSI of even subbands of the candidate cell corresponding to the special cell;

[0327] ● The CSI of odd subbands of candidate cell #1 not corresponding to the special cell;

[0328] ● The CSI of odd subbands of candidate cell #2 not corresponding to the special cell;

[0329] ● …

[0330] ● The CSI of odd subbands of candidate cell #N-1 not corresponding to the special cell;

[0331] ● The CSI of odd subbands of the candidate cell corresponding to the special cell.

[0332] Optionally, in CSI Part 2 subband (when the N candidate cells do not include the candidate cell corresponding to the special cell,) the priorities of the CSI of the N candidate cells (from high to low / from low to high) are as follows:

[0333] ● The CSI of even subbands of candidate cell #1;

[0334] ● The CSI of odd subbands of candidate cell #1;

[0335] ● The CSI of even subbands of candidate cell #2;

[0336] ● The CSI of odd subbands of candidate cell #2;

[0337] ● …

[0338] ● The CSI of even subbands of candidate cell #N;

[0339] ● The CSI of odd subbands of candidate cell #N.

[0340] Optionally, in CSI Part 2 subband (when the N candidate cells do not include the candidate cell corresponding to the special cell,) the priorities of the CSI of the N candidate cells (from high to low / from low to high) are as follows:

[0341] ● The CSI of even subbands of candidate cell #1;

[0342] ● The CSI of even subbands of candidate cell #2;

[0343] ● …

[0344] ● The CSI of even subbands of candidate cell #N;

[0345] ● The CSI of odd subbands of candidate cell #1;

[0346] ● The CSI of odd subbands of candidate cell #2;

[0347] ● …

[0348] ● The CSI of odd subbands of candidate cell #N.

[0349] Optionally, the value of the LTM candidate configuration ID corresponding to candidate cell #1 is the smallest, the value of the LTM candidate configuration ID corresponding to candidate cell #2 is the second smallest, and so on. Optionally, the value of the LTM candidate configuration ID corresponding to candidate cell #n is the n-th smallest. Refer above for the indexing method of the candidate cells.

[0350] The above method defines the priorities of the CSI, so that the UE and the base station have the same understanding of the priorities of the CSI, improving the reliability of the communication system. In some cases, since the CSI corresponding to the current special cell can be obtained through non-LTM CSI reporting, the priority of the CSI of the non-current special cell is more useful than the CSI of the current special cell, and the above method may enable the priority of the CSI of the non-current special cell to be different from the priority of the CSI of the current special cell, thereby preventing the preferential omission of the CSI of the non-special cell and improving the reliability of the communication system.

[0351] Method for determining the number (e.g., ) of CSI processing units (CPUs) occupied by the CSI report associated with / corresponding to the first CSI reporting configuration. Relevant definitions are briefly described below.

[0352] The UE indicates the number of supported simultaneous CSI calculations with parameter simultaneousCSI-ReportsPerCC in a component carrier, and simultaneousCSI-ReportsAllCC across all component carriers.

[0353] If a UE supports NCPU simultaneous CSI calculations, it is said to have CSI processing units for processing CSI reports. If L CPUs are occupied for calculation of CSI reports in a given OFDM symbol, the UE has unoccupied CPUs.

[0354] Optionally, the UE may determine whether at least one CSI report (e.g., each CSI report) of N CSI reports is updated based on priorities and / or CPU occupation (e.g., the occupation of the CPU, or the number of unoccupied CPU(s)) corresponding to the N CSI reports. If N CSI reports start occupying their respective CPUs on the same OFDM symbol on which CPUs are unoccupied, where each CSI report corresponds to , the UE is not required to update the requested CSI reports with lowest priority, where 0≤M≤N is the largest value such that holds. Processing of a CSI report occupies a number of CPUs for a number of symbols.

[0355] Optionally, the N CSI reports do not include the CSI report corresponding to / associated with a third CSI reporting configuration. Optionally, the N CSI reports do not include the CSI report corresponding to / associated with the third CSI reporting configuration satisfying a third condition.

[0356] Optionally, in order to determine whether at least one CSI report (e.g., each CSI report) of the N CSI reports is updated, the UE assumes that the N CSI reports do not include the CSI report corresponding to / associated with the third CSI reporting configuration. Optionally, in order to determine whether at least one CSI report (e.g., each CSI report) of the N CSI reports is updated, the UE assumes that the N CSI reports do not include the third CSI reporting configuration corresponding to / associated with the third CSI reporting configuration satisfying the third condition.

[0357] Optionally, the number of CPUs occupied by the CSI report corresponding to / associated with the third CSI reporting configuration of the N CSI reports is 0 (e.g., =0). Optionally, the number of CPUs occupied by the CSI report corresponding to / associated with the third CSI reporting configuration satisfying the third condition of the N CSI reports is 0 (e.g., =0).

[0358] Optionally, the CSI report corresponding to / associated with the third CSI reporting configuration of the N CSI reports is not updated. Optionally, the CSI report corresponding to / associated with the third CSI reporting configuration and satisfying the third condition of the N CSI reports is not updated.

[0359] Optionally, in order to determine whether at least one CSI report (e.g., each CSI report) of the N CSI reports is updated, the UE assumes that the number of CPUs occupied by the CSI report corresponding to / associated with the third CSI reporting configuration of the N CSI reports is 0 (e.g., =0), and / or the CSI report corresponding to / associated with the third CSI reporting configuration of the N CSI reports is not updated. Optionally, in order to determine whether at least one CSI report (e.g., each CSI report) of the N CSI reports is updated, the UE assumes that the number of CPUs occupied by the CSI report corresponding to / associated with the third CSI reporting configuration satisfying the third condition of the N CSI reports is 0 (e.g., =0), and / or the CSI report corresponding to / associated with the third CSI reporting configuration and satisfying the third condition of the N CSI reports is not updated.

[0360] Optionally, the third condition includes at least one of the followings: 1) the CSI report corresponding to / associated with the third CSI reporting configuration occupies CPU(s); 2) the CSI report corresponding to / associated with the third CSI reporting configuration occupies processing unit(s) (PU(s)); 3) the CSI report corresponding to / associated with the third CSI reporting configuration is not updated. Optionally, the CSI report being not updated means that it is not required to be updated. Optionally, the CSI report being not updated means that the CSI report is determined to be not required to be updated based on the PU-related method. Refer below for the method for determining whether the CSI report is updated based on the PU. Optionally, the CSI report being not updated means that the CSI report is not required to be updated for the same OFDM symbol (e.g., for OFDM symbols related to the N CSI reports). Optionally, the UE determines whether the CSI report is updated based on the PU and / or CPU on the same symbol (e.g., OFDM symbol).

[0361] Optionally, the third condition includes at least one of the followings: 1) the CSI report corresponding to / associated with the third CSI reporting configuration is not in M; 2) the CSI report corresponding to / associated with the third CSI reporting configuration is not in .

[0362] Optionally, the CSI report being not in M may include: the CSI report being not considered in M, or the CSI report being not in M CSI reports, or the CSI report being not considered in the M CSI reports, or the CSI report being in N-M CSI reports, or the CSI report being considered in the N-M CSI reports. Optionally, the M CSI reports may be M CSI reports that are updated. Optionally, the M CSI reports may be CSI reports numbered from 0 to M-1. Optionally, the N-M CSI reports may be N-M CSI reports that are not updated. Optionally, the N-M CSI reports may be CSI reports numbered from M to N-1. Optionally, being updated may include being required to be updated. Optionally, being not updated may include being not required to be updated. Refer above for the determination method of M and / or the determination method of the M CSI reports and / or the determination method of the N-M CSI reports.

[0363] Optionally, the CSI report being not in may include: the CSI report being not considered in , or the CSI report being not in CSI reports, or the CSI report being not considered in CSI reports, or the CSI report being in CSI reports, or the CSI report being considered in CSI reports. Optionally, the CSI reports may be CSI reports that are updated. Optionally, the CSI reports may be CSI reports numbered from 0 to -1. Optionally, the CSI reports may be CSI reports that are not updated. Optionally, the CSI reports may be CSI reports numbered from to . Optionally, being updated may include being required to be updated. Optionally, being not updated may include being not required to be updated. Refer above for the determination method of and / or the determination method of the CSI reports and / or the determination method of the CSI reports.

[0364] In order to determine whether at least one CSI report (or each CSI report) of the N CSI reports is updated, or in order to determine whether at least one CSI report (or each CSI report) of the NAICSI reports is updated, the UE may assume that the number of PUs and / or CPUs occupied by the CSI report corresponding to / associated with the third CSI reporting configuration of the NAI CSI reports is 0 based on M and / or . Refer above for details. When the number of CPUs and / or PUs occupied by some CSI reports corresponding to / associated with the third CSI reporting configuration is considered as 0, M and / or will change. This will cause different understanding of M and / or between the UE and the base station, resulting in the CSI report being not updated correctly. The following method can define how M and / or are determined, avoiding different understanding of M and / or between the UE and the base station and improving the reliability of the communication system. Optionally, M and / or are determined prior to the number of the occupied CPUs and / or the occupied PUs corresponding to the CSI report considered to be 0. Optionally, the CSI report includes the CSI report corresponding to / associated with the third CSI reporting configuration. Optionally, the CSI report includes any of CSI report(s), or at least one CSI report, or all CSI report(s). Optionally, the CSI report includes any CSI report of the N CSI reports, or at least one CSI report of the N CSI reports, or all CSI report(s) of the N CSI reports. Optionally, the CSI report includes any CSI report of the NAI CSI reports, or at least one CSI report of the NAI CSI reports, or all CSI report(s) of the NAI CSI reports. Optionally, the CPU occupied by the CSI report corresponding to / associated with the third CSI reporting configuration includes at least one of the followings: 1) the number of CPU occupied by the CSI report corresponding to / associated with the third CSI reporting configuration is (e.g., ) greater than 0; 2) the number of CPU occupied by the CSI report corresponding to / associated with the third CSI reporting configuration is (e.g., ) equal to a first value; 3) the number of CPU occupied by the CSI report corresponding to / associated with the third CSI reporting configuration is (e.g., ) greater than the first value. The first value may be a positive integer. For example, the first value may be one of 1, 2, 3, 4, 5, 6, 7, 8.

[0365] Optionally, the PU occupied by the CSI report corresponding to / associated with the third CSI reporting configuration includes at least one of the followings: 1) the number of PU occupied by the CSI report corresponding to / associated with the third CSI reporting configuration is (e.g., ) greater than 0; 2) the number of PU occupied by the CSI report corresponding to / associated with the third CSI reporting configuration is (e.g., ) greater than or equal to a second value. The second value may be a positive integer. For example, the second value may be one of 1, 2, 3, 4, 5, 6, 7, 8.

[0366] Optionally, the UE first determines whether the CSI report is updated (e.g., whether it may be updated) based on the PU, and then determines whether the CSI report is updated based on the CPU. Optionally, the UE first determines whether the CSI report is to be updated based on the PU, and then determines whether CSI report is updated based on the CSI report determined to be updated according to PU (or the CSI report determined not to be updated according to PU) based on the CPU. For example, for an OFDM symbol, the UE first determines that X CSI reports are not updated based on the PU, X≥0. For the OFDM symbol, the UE then excludes the CSI report(s) same as at least one CSI report of the X CSI reports in the N CSI reports, and performs the above operation (e.g., operation for determining whether the CSI report is updated, or operation for determining whether the CSI report is updated based on the CPU) based on the remaining CSI report(s). For example, for an OFDM symbol, the UE first determines that X CSI reports are not updated based on the PU, X≥0. For the OFDM symbol, the UE then performs the above operation (e.g., operation for determining whether the CSI report is updated, or operation for determining whether the CSI report is updated based on the CPU) based on the CSI report that is not the X CSI reports (or is not at least one CSI report of the X CSI reports) of the N CSI reports. For example, for an OFDM symbol, the UE first determines that X CSI reports are updated based on the PU, X≥0. For the OFDM symbol, the UE then performs the above operation (e.g., operation for determining whether the CSI report is updated, or operation of determining whether the CSI report is updated based on the CPU) based on the CSI report that is the X CSI reports (or is at least one CSI report of the X CSI reports) of the N CSI reports.

[0367] The above method may allow the UE to first determine which CSI reports are not updated based on the PU. Since these CSI reports that are not updated do not need to occupy corresponding CPUs, when which CSI reports are not updated is determined based on the CPU, these CSI reports (e.g., the CSI reports that are not updated determined based on the PU) can be excluded through the above method, avoiding repetitive counting, increasing the number of CSI reports that may be updated and improving the efficiency of the system.

[0368] In the disclosure, corresponding to / associated with the first CSI reporting configuration may be of the CSI report corresponding to / associated with the first CSI reporting configuration. Optionally, the number of occupied CPUs ( ) corresponding to / associated with the first CSI reporting configuration may be determined based on at least one of the followings: the number N of the reference signal resources corresponding to the candidate cell. Optionally, the number of CPUs occupied by the CSI report corresponding to the first CSI reporting configuration is the summation of the numbers of the reference signal resources corresponding to each candidate cell of the N candidate cells. For example, of the CSI report corresponding to the first CSI reporting configuration , where refers to the number of the reference signal resources corresponding to candidate cell #i. Candidate cell #i refers to the i-th candidate cell of the N candidate cells.

[0369] The above method defines the number of CPUs occupied by the CSI report for LTM, so that the UE and the base station have the same understanding of the number of CPUs occupied by the CSI report, improving the reliability of the communication system.

[0370] Method of determining the priority value of the CSI report is discussed below. Optionally, the priority (e.g., priority value, ) associated with / corresponding to the CSI report is determined / computed by the following Equation 1:

[0371]

[0372] where the meaning and / or value of each parameter is as follows:

[0373] ● The value of y is as follows:

[0374] ■ y = 0 for aperiodic CSI reports to be carried on PUSCH;

[0375] ■ y = 1 for semi-persistent CSI reports to be carried on PUSCH;

[0376] ■ y = 2 for semi-persistent CSI reports to be carried on PUCCH;

[0377] ■ y = 3 for periodic CSI reports to be carried on PUCCH.

[0378] ● The value of k is as follows:

[0379] ■ k=0 for CSI reports carrying L1-RSRP or L1-SINR; k=1 for CSI reports not carrying L1-RSRP or L1-SINR.

[0380] ● c is the serving cell index.

[0381] ■ Optionally, for the CSI report configured with the CSI reporting configuration for LTM, c is the serving cell index value where the reporting configuration is configured.

[0382] ■ Optionally, for the CSI report configured with the CSI reporting configuration for LTM and carrying L1-RSRP or L1-SINR, c is the serving cell index value where the reporting configuration is configured.

[0383] ■ Optionally, for the CSI report configured with the CSI reporting configuration for LTM and not carrying L1-RSRP or L1-SINR, c is the serving cell index value where the reporting configuration is configured.

[0384] ● is the value of the higher layer parameter, where the higher layer parameter is used for representing the maximum number of the serving cells, for example, is maxNrofServingCells. Optionally, the higher layer parameter is indicated by the UE capability.

[0385] ● s is the reportConfigID, for example, the reporting configuration ID parameter corresponding to the CSI report. Optionally, for the CSI report configured with the CSI reporting configuration for LTM, s refers to the ID of the CSI reporting configuration for LTM (LTM-CSI-ReportConfigID).

[0386] ● is the value of the higher layer parameter. Optionally, for the CSI report configured with the CSI reporting configuration for LTM, is the maximum number of the CSI reporting configurations for LTM (e.g., maxNrofLTM-CSI-ReportConfigurations).

[0387] Optionally, two CSI reports are said to collide if the time resources of the physical channels scheduled to carry the CSI reports overlap in at least one OFDM symbol and are transmitted on the same carrier.

[0388] Optionally, if the values of y of two CSI reports are different, the CSI report with the higher value of the two CSI reports is not transmitted by the UE. Optionally, if the values of y of two CSI reports are the same, the two CSI reports may be multiplexed or one of the two CSI reports is dropped based on the priority value.

[0389] In the disclosure, the CSI report configured with the CSI reporting configuration for LTM refers to the CSI report corresponding to the CSI reporting configuration for LTM.

[0390] Optionally, priorities of two CSI reports configured with the CSI reporting configuration for LTM may be determined based on the CSI in the two CSI reports (or the CSI candidate cells in the two CSI reports). Optionally, if two CSI reports configured with the CSI reporting configuration for LTM have the same value, the priorities of the two CSI reports may be determined based on the CSI in the two CSI reports (or the CSI candidate cells in the two CSI reports). Refer above for the computing method of the value. Optionally, the priorities of the two CSI reports may be determined based on whether the candidate cells corresponding to the CSI in the two CSI reports are the current special cell. Optionally, if the candidate cells corresponding to the CSI in the two CSI reports are the same and are the current special cell, the priorities of the two CSI reports are the same. Optionally, if the candidate cells corresponding to the CSI in the two CSI reports are the current special cell, the priorities of the two CSI reports are the same. Optionally, if neither of the candidate cells corresponding to the CSI in the two CSI reports is the current special cell, the priorities of the two CSI reports are the same. Optionally, if the candidate cell corresponding to the CSI in one of the two CSI reports is the current special cell, and the candidate cell corresponding to the CSI in the other CSI report is the non-current special cell, the priorities of the two CSI reports are different.

[0391] Optionally, if the candidate cell corresponding to the CSI in the first CSI report of the two CSI reports is the current special cell, and the candidate cell corresponding to the CSI in the second CSI report of the two CSI reports is not the current special cell, the priority of the first CSI report is lower than the priority of the second CSI report. Optionally, if the candidate cell corresponding to the CSI in the first CSI report of the two CSI reports is not the current special cell, and the candidate cell corresponding to the CSI in the second CSI report of the two CSI reports is the current special cell, the priority of the first CSI report is lower than the priority of the second CSI report.

[0392] Since the CSI corresponding to the current special cell can be obtained through non-LTM CSI reporting, the priority of the CSI of the non-current special cell is more useful than the CSI of the current special cell, and the above method may enable the priority of the CSI of the non-current special cell to be different from the priority of the CSI of the current special cell, for example, thereby preventing the preferential dropping of the CSI of the non-current special cell and improving the reliability of the communication system.

[0393] In some cases, since the rank in the CSI report (e.g., the rank indicated by RI) is selected / determined by the UE, the base station may not be able to know the rank reported by the UE before demodulating the channel related to uplink channel (e.g., PUSCH or PUCCH). In some cases (different reported ranks may correspond to different payloads / numbers of information bits), this would affect some behaviors of the UE, such as the determination of the PUCCH resource, the determination of the number of physical resource blocks (PRBs) of the corresponding resource, or the determination of the number of CSI reports with CSI Part 2. A feasible method is that both the base station and the UE use the same assumption of a predefined rank, in this way, the above UE behaviors are irrelevant with the rank reported by the UE, which can avoid the UE and the base station from having different understandings, thereby improving the reliability of the communication system. Specific method is as follows: (the UE) assumes that the rank in the CSI report is a predefined rank, or the configured highest allowed rank. The predefined rank may be one of rank 1, rank 2, rank 3 and rank 4. The following takes the rank in the CSI report as rank 1 as an example. For example, (the UE) assumes that the CSI report indicates rank 1. For example, (the UE) assumes that RI in the CSI report indicates rank 1. For example, (the UE) performs the above UE behavior based on the assumption that the CSI report indicates rank 1. For example, when a first condition is satisfied, based on the assumption that the CSI / RI corresponding to each of the N candidate cells indicates rank 1, the UE determines the PUCCH resource and / or the number of PRBs corresponding to the PUCCH resource, or determines the number of CSI reports including CSI Part 2 (referred to as CSI Part 2 CSI report in the disclosure). The first condition includes at least one of the followings:

[0394] ● The UE would multiplex CSI reports (CSI part 2 CSI reports) that include Part 2 CSI reports in a PUCCH resource;

[0395] ● The CSI report includes the CSI corresponding to / associated with the N candidate cells;

[0396] ● The report quantity parameter corresponding to (or configured by) the first CSI reporting configuration include at least ‘RI’;

[0397] ● The report quantity parameter (e.g., reportQuantity) corresponding to (or configured by) the first CSI reporting configuration is set to at least one of ‘cri-RI-PMI-CQI’, ’cri-RI-LI-PMI-CQI’, ’cri-RI-i1’, ’cri-RI-i1-CQI’, ’cri-RI-CQI’;

[0398] ● The report quantity parameter (e.g. reportQuantity) corresponding to (or configured by) the first CSI reporting configuration is set to at least one of ‘cri-RI-PMI-CQI’, ‘cri-RI-LI-PMI-CQI’, ‘cri-RI-i1-CQI’, ‘cri-RI-CQI’;

[0399] ● N is determined (refer above for determination method of N);

[0400] ● The first CSI reporting configuration includes a parameter indicating N;

[0401] ● The number of the resources included in the resource set (for channel measurement) corresponding to the first CSI reporting configuration is greater than 1;

[0402] ● The number of the resources included in the resource set (for channel measurement) corresponding to the first CSI reporting configuration is greater than or equal to 2.

[0403] Since the number (for example, N) of the resources corresponding to the CSI in the CSI report may be selected / determined by the UE, the base station may not be able to know the number of the resources corresponding to the CSI contained in the report by the UE before demodulating the channel related to the uplink channel (for example, PUSCH or PUCCH). In some cases (different numbers of the resources corresponding to the CSI may correspond to different payloads / numbers of information bits), this would affect some behaviors of the UE, such as the determination of the PUCCH resource, the determination of the number of PRBs of the corresponding resource, or the determination of the number of CSI reports with CSI Part 2. A feasible method is that both the base station and the UE use the same assumption of a predefined number (for example, N) of the resources corresponding to the CSI, in this way, the above UE behaviors are irrelevant with the number (for example, N) of the resources corresponding to the CSI reported by the UE, which can avoid the UE and the base station from having different understandings, thereby improving the reliability of the communication system. Specific method is as follows, taking N as an example for description: (the UE) assumes that N corresponding to the CSI report is predefined (for example, one of 1, 2, 3, and 4), or N is equal to K. When a second condition is satisfied, based on the assumption that N is predefined (for example, N is one of 1, 2, 3, and 4), or based on the assumption that N is based on / equal to the value indicated by the UE capability-related maximum value parameter., the UE determines the PUCCH resource and / or the number of PRBs corresponding to the PUCCH resource, or determines the number of the CSI Part 2 CSI reports. When the second condition is satisfied, the UE determines the PUCCH resource and / or the number of PRBs corresponding to the PUCCH resource, or determines the number of CSI Part 2 CSI reports assuming at least one of the followings: N is predefined (for example, one of 1, 2, 3, 4), or N is equal to K, or N is based on / equal to the value indicated by the UE capability-related maximum value parameter. The second condition includes at least one of the followings:

[0404] ● The UE would multiplex CSI reports (CSI part 2 CSI reports) that include Part 2 CSI reports in a PUCCH resource;

[0405] ● The CSI report includes the CSI corresponding to the N candidate cells;

[0406] ● The report quantity parameter corresponding to (or configured by) the first CSI reporting configuration include at least ‘RI’;

[0407] ● The report quantity parameter (e.g., reportQuantity) corresponding to (or configured by) the first CSI reporting configuration is set to at least one of ‘cri-RI-PMI-CQI’, ‘cri-RI-LI-PMI-CQI’, ‘cri-RI-i1’, ‘cri-RI-i1-CQI’, ‘cri-RI-CQI’;

[0408] ● The report quantity parameter (e.g. reportQuantity) corresponding to (or configured by) the first CSI reporting configuration is set to at least one of ‘cri-RI-PMI-CQI’, ‘cri-RI-LI-PMI-CQI’, ‘cri-RI-i1-CQI’, ‘cri-RI-CQI’;

[0409] ● The first CSI reporting configuration includes a parameter indicating N.

[0410] In some cases, the UE may receive / be configured with the CSI reporting configuration.

[0411] Optionally, the CSI reporting configuration may indicate / include an associated reference resource set. Optionally, the reference resource set may include the reference resource set for channel measurement and / or the reference resource set for interference measurement. Optionally, the reference resource set may include K reference signal resources. Optionally, the reference resource set for channel measurement may include K reference signal resources. Optionally, K≥1 or K>1. Optionally, the reference signal resource may be a CSI-RS resource. Optionally, the reference signal resource may be an NZP CSI-RS resource. Optionally, the K reference signal resources have the same number of antenna ports. For example, the number of antenna ports of a reference signal resource is PCSI-RS. Optionally, the total number of antenna ports of the K reference signal resources may be denoted as Ptotal. Optionally, Ptotal=PCSI-RS*K. Optionally, the number of antenna ports of a reference signal resource may be indicated by configuration information (e.g., nrofPorts) associated with the reference signal resource. Optionally, one reference signal resource (or each reference signal resource) of the K reference signal resources may be configured with the power control offset parameter (e.g., powerControlOffset). Optionally, the power control offset parameters of the K reference signal resources may be the same. Optionally, the values of the power control offset parameters of the K reference signal resources are the same. Optionally, the values corresponding to the power control offset parameters of the K reference signal resources are the same. Optionally, the power control offset parameter may be used for CSI computation (e.g. CQI computation).

[0412] Optionally, the CSI reporting configuration may indicate / include a configuration parameter of the associated codebook. Optionally, the codebook type associated with the CSI reporting configuration may be a refined codebook. The refined codebook may include at least one of the followings: a refined Type I codebook, a refined enhanced Type II codebook (refined eType II), a refined further enhanced Type II Port Selection codebook (refined FeType II Port Selection), a refined enhanced Type II Port Selection codebook for predicted PMI (refined eType II for predicted PMI). Optionally, the refined Type I codebook may include a refined Type I Single-Panel codebook and / or a refined Type I Multi-Panel codebook.

[0413] For example, the codebook type associated with the CSI reporting configuration may be determined by the codebook parameter indicated by / included in the CSI reporting configuration. For example, when the codebook parameter (e.g., codebookType) indicated by / included in the CSI reporting configuration is set to a first value (e.g., ‘typeI-SinglePanel-r19’), the CSI reporting configuration is associated with the refined Type I Single-Panel codebook. For example, when the codebook parameter (e.g., codebookType) indicated by / included in the CSI reporting configuration is set to a second value (e.g., ‘typeI-MultiPanel-r19’), the CSI reporting configuration is associated with the refined Type I Multi-Panel codebook.

[0414] Optionally, the CSI reporting configuration may indicate / include one or more sub-configurations. Optionally, the CSI reporting configuration may indicate / include L sub-configurations. Optionally, L≥1 or L≥2. Optionally, the UE may report the CSI associated with N sub-configurations of the L sub-configurations. For example, the UE may report the CSI for each of the N sub-configurations of the L sub-configurations. Optionally, the CSI associated with the N sub-configurations may be carried by the CSI report. Optionally, the CSI associated with the N sub-configurations may be reported in a report instance. Optionally, N ≤ L. Optionally, N≥1.

[0415] Optionally, N=L when the CSI report is periodic CSI report. The UE reports the CSI associated with the L sub-configurations.

[0416] Optionally, when the CSI report is semi-persistent CSI report on PUSCH, N is indicated by the associated trigger state. For example, the UE receives / detects a DCI indicating a CSI trigger state, where the trigger state indicates the N sub-configurations of the L sub-configurations. The UE reports the CSI associated with the N sub-configurations. Optionally, the CSI trigger state is indicated / configured by the base station.

[0417] Optionally, when the CSI report is semi-persistent CSI report on PUCCH, N is indicated by the associated MAC-CE. For example, the UE receives / detects a MAC-CE, the MAC-CE activates the CSI report. The MAC-CE indicates the N sub-configurations of the L sub-configurations. The UE reports the CSI associated with the N sub-configurations.

[0418] Optionally, when the CSI report is aperiodic CSI report, N is indicated by the associated trigger state. For example, the UE receives / detects a DCI indicating a CSI trigger state, where the trigger state indicates the N sub-configurations of the L sub-configurations. The UE reports the CSI associated with the N sub-configurations. Optionally, the CSI trigger state is indicated / configured by the base station.

[0419] Optionally, one sub-configuration (or at least one sub-configuration, or each sub-configuration) of the L sub-configurations may be configured with a port subset. Optionally, the port subset of a sub-configuration may be configured by a bitmap. For example, the sub-configuration may include a parameter (e.g., portSubsetIndicator-r19) for indicating the bitmap. Optionally, the bitmap may include K*PCSI-RS bits (or include Ptotal bits). For example, the bitmap may include a bit sequence . Optionally, a bit in the bitmap (for example, the bit sequence) corresponds to an antenna port of one reference signal resource of the K reference signal resources. Optionally, one / each bit in the bitmap (e.g., the bit sequence) corresponds to an antenna port of Ptotal antenna ports of the K reference signal resources. Optionally, when the value of a bit is a third value (e.g., 0), the corresponding antenna port is disabled. Optionally, when the value of a bit is the third value (e.g., 0), the corresponding antenna port is not included in the antenna port subset. Optionally, when the value of a bit is a fourth value (e.g., 1), the corresponding antenna port is enabled. When the value of a bit is the fourth value (e.g., 1), the corresponding antenna port is included in the antenna port subset.

[0420] Optionally, one sub-configuration (or at least one sub-configuration, or each sub-configuration) of the L sub-configurations may be configured with the codebook parameter. For example, when the codebook parameter corresponding to a sub-configuration is set to the first value, the sub-configuration is associated with the refined Type I Single-Panel codebook. For example, when the codebook parameter corresponding to a sub-configuration is set to the second value, the sub-configuration is associated with the refined Type I Multi-Panel codebook.

[0421] Optionally, when the codebook parameter corresponding to a sub-configuration is set to the first value, the sub-configuration may indicate the parameters N1 and N2 associated with the codebook. Here, N1 may be the number of antenna ports in first dimension. N2 may be the number of antenna ports in second dimension. Optionally, P’=2*N1*N2, where P’ refers to the number of bits of the fourth value in the bitmap indicated by the sub-configuration. Optionally, the UE determines the CSI (e.g., PMI and / or CQI) for the sub-configuration based on N1 and N2.

[0422] Optionally, when the codebook parameter corresponding to a sub-configuration is set to the second value, the sub-configuration may indicate at least one of the parameters N1, N2, and Ng associated with the codebook. Here, N1 may be the number of antenna ports in first dimension. N2 may be the number of antenna ports in second dimension. Ng may be the number of antenna port groups. Optionally, P’=2*Ng*N1*N2, where P’ refers to the number of bits of the fourth value (e.g., the value of 1) in the bitmap indicated by the sub-configuration. Optionally, Ng=K. Optionally, the UE determines the CSI (e.g., PMI and / or CQI) for the sub-configuration based on at least one of N1, N2, Ng.

[0423] Optionally, one sub-configuration (or at least one sub-configuration, or each sub-configuration) of the L sub-configurations may be configured with the power offset. Optionally, the power offset may be indicated by a power offset parameter (e.g., powerOffset). Optionally, the power offset corresponds to X dB. Optionally, X may be indicated by the power offset parameter. Optionally, X may be an integer. Optionally, X may be an integer greater than or equal to 0. Optionally, X may be an integer ranged from 0 to 23. The above method can define the indication method / value range of the power offset, preventing the base station / UE from using the wrong method / value range to indicate the power offset and improving the reliability of the communication system.

[0424] The reference signal resource is described taking CSI-RS resource as an example below. Optionally, the UE determines / computes the CSI (e.g., CQI) for the sub-configuration based on the ratio of PDSCH EPRE to CSI-RS EPRE. Optionally, CSI-RS EPRE refers to CSI-RS EPRE for K CSI-RS resources. For example, if a sub-configuration indicates the power offset (e.g., the power offset indicated by the power offset parameter), for computation of the CSI (e.g., computation of the CQI), the ratio of PDSCH EPRE to CSI-RS EPRE is determined based on the power offset indicated by the sub-configuration. Optionally, the UE determines / computes the CQI for the sub-configuration based on the ratio of PDSCH EPRE to CSI-RS EPRE. Optionally, the UE determines / computes the CQI for the sub-configuration based on (the assumption of) the ratio of PDSCH EPRE to CSI-RS EPRE. Optionally, for the CQI computation for the sub-configuration, the UE assumes / determines the ratio of EPRE for the corresponding PDSCH signals transmitted on the antenna ports of a CSI-RS resource to CSI-RS EPRE. Optionally, the ratio (e.g., the ratio of PDSCH EPRE to CSI-RS EPRE) is based on the power control offset parameter (e.g., powerControlOffset) of the CSI-RS resource, the power offset associated with / indicated by / configured by the sub-configuration, the number of ports of the CSI-RS resource (for example, the number of ports configured by the higher layer parameter nrofPorts), and the number of ports in the port subset associated with / indicated by / configured by the sub-configuration. Here, the number of ports of the CSI-RS resource (for example, the number of ports configured / indicated by the parameter nrofPorts) is denoted as P0. Here, the number (or total number) of ports in the port subset associated with / indicated by / configured by the sub-configuration is denoted as P. In the disclosure, the term “number of ports in the port subset” may be interchangeable with “the number of ports in the port subset indicated by the higher layer parameter (e.g., port-subsetIndicator)” or “the number of all bits with the value of 1 indicated by / corresponding to the higher layer parameter (e.g., port-subsetIndicator)”. Optionally, the ratio is based on / equal to at least one of the followings:

[0425] ● Optionally, the summation of the power control offset parameter (e.g., powerControlOffset) of the CSI-RS resource and . Optionally, the ratio is equal to the product (in linear scale) of the power control offset parameter (e.g., powerControlOffset) of the CSI-RS resource and . For example, powerControlOffset is 3dB, P=16, P0=32, the ratio is 0dB;

[0426] ● Optionally, the summation of the power control offset parameter (e.g., powerControlOffset) of the CSI-RS resource and 10 . Optionally, the ratio is equal to the product (in linear scale) of the power control offset parameter (e.g., powerControlOffset) of the CSI-RS resource and . For example, powerControlOffset is 3dB, P=16, P0=32, the ratio is 6dB;

[0427] ● Optionally, the summation of the power control offset parameter (e.g., powerControlOffset) of the CSI-RS resource and . Optionally, the ratio is equal to the product (in linear scale) of the power control offset parameter (e.g., powerControlOffset) of the CSI-RS resource and . For example, powerControlOffset is 3dB, P=16, the ratio is 15dB;

[0428] ● Optionally, the summation of the power control offset parameter (e.g., powerControlOffset) of the CSI-RS resource and . Optionally, the ratio is equal to the product (in linear scale) of the power control offset parameter (e.g., powerControlOffset) of the CSI-RS resource and . For example, powerControlOffset is 3dB, P=16, the ratio is -9dB;

[0429] ● Optionally, the summation of the power control offset parameter (e.g., powerControlOffset) of the CSI-RS resource and . Optionally, the ratio is equal to the product (in linear scale) of the power control offset parameter (e.g., powerControlOffset) of the CSI-RS resource and . For example, powerControlOffset is 3dB, P0=32, the ratio is 18dB;

[0430] ● Optionally, the summation of the power control offset parameter (e.g., powerControlOffset) of the CSI-RS resource and . Optionally, the ratio is equal to the product (in linear scale) of the power control offset parameter (e.g., powerControlOffset) of the CSI-RS resource and . For example, powerControlOffset is 3dB, P0=32, the ratio is -12dB;

[0431] ● Optionally, the difference of the power control offset parameter (e.g., powerControlOffset) of the CSI-RS resource and the power offset. For example, the ratio may be based on / equal to the difference of the power control offset parameter (e.g., powerOffset) of the reference signal resource and the power offset indicated by the sub-configuration;

[0432] ● Optionally, the summation of the power control offset parameter (e.g., powerControlOffset) of the CSI-RS resource and the power offset. For example, the ratio may be based on / equal to the summation of the power control offset parameter (e.g., powerOffset) of the reference signal resource and the power offset indicated by the sub-configuration.

[0433] Optionally, when a third condition is satisfied, one sub-configuration (or at least one sub-configuration, or each sub-configuration) of the L sub-configurations is configured with the power offset parameter. Optionally, when the third condition is satisfied, one sub-configuration (or at least one sub-configuration, or each sub-configuration) of the N sub-configurations is configured with the power offset parameter. Optionally, the sub-configuration being configured with the power offset parameter means that the field corresponding to the power offset parameter in the sub-configuration is mandatory present. Optionally, the field corresponding to the power offset parameter may be a field in the RRC parameter. Optionally, the field corresponding to the power offset parameter may be a field in RRC signaling. Optionally, the third condition includes at least one of the followings: 1) the port subset with which one sub-configuration (or at least one sub-configuration, or each sub-configuration) of the L sub-configurations is configured; 2) the codebook parameter corresponding to one sub-configuration (or at least one sub-configuration, or each sub-configuration) of the L sub-configurations is set to the first value; 3) the codebook parameter corresponding to one sub-configuration (or at least one sub-configuration, or each sub-configuration) of the L sub-configurations is set to the second value; 4) the port subset with which one sub-configuration (or at least one sub-configuration, or each sub-configuration) of the N sub-configurations is configured; 5) the codebook parameter corresponding to one sub-configuration (or at least one sub-configuration, or each sub-configuration) of the N sub-configurations is set to the first value; 6) the codebook parameter corresponding to one sub-configuration (or at least one sub-configuration, or each sub-configuration) of the N sub-configurations is set to the second value; 7) the codebook parameter corresponding to / associated with the CSI reporting configuration is set to the first value; 8) the codebook parameter corresponding to / associated with the CSI reporting configuration is set to the second value. The above method allows the base station to further compensate for the power change caused by the change in the number of ports in the port subset through the power offset parameter when the port subset is configured, improving the flexibility of the communication system.

[0434] Optionally, the UE determines the CSI (e.g., PMI / CQI) based on the antenna ports in the antenna port subset. Optionally, the UE determines the CSI (e.g., PMI / CQI) for the sub-configuration based on the antenna ports in the antenna port subset indicated by the sub-configuration.

[0435] In some cases, the base station may transmit the CSI reporting configuration. For example, the base station may transmit the CSI reporting configuration via RRC signaling. The base station may receive the CSI report associated with the CSI reporting configuration. For example, the base station may receive the CSI report, where the CSI report carries the CSI associated with the CSI reporting configuration.

[0436] In some cases, the UE may receive / be configured with the third CSI reporting configuration. The UE may receive / be configured with one or more third CSI reporting configurations. In the disclosure, the third CSI reporting configuration and / or the CSI report associated with / corresponding to the third CSI reporting configuration may be based on Artificial Intelligent / Machine Learning (AI / ML). In the disclosure, the term “AI / ML” may be used interchangeably with the term “AI / ML model” or “model”. Optionally, the third CSI reporting configuration and / or the CSI report associated with / corresponding to the third CSI reporting configuration may be for inference. In the disclosure, for inference may include for prediction. In the disclosure, the term “inference” and the term “prediction” are interchangeable. Optionally, the third CSI reporting configuration and / or the CSI report associated with / corresponding to the third CSI reporting configuration may be used to report the inference result. In the disclosure, the inference may be AI / ML model-based inference. Optionally, the third CSI reporting configuration and / or the CSI report associated with / corresponding to the third CSI reporting configuration may be for model monitoring. In the disclosure, the model monitoring may be monitoring of the AI / ML model. Optionally, the third CSI reporting configuration and / or the CSI report associated with / corresponding to the third CSI reporting configuration may be for training. In the disclosure, the training may be training of the AI / ML model. Optionally, the third CSI reporting configuration and / or the CSI report associated with / corresponding to the third CSI reporting configuration may be for data collection. In the disclosure, the data collection may be data collection for the AI / ML model.

[0437] Optionally, the third CSI reporting configuration may be for CSI acquisition. Optionally, the third CSI reporting configuration may be for CSI prediction. Optionally, the third CSI reporting configuration may be for beam prediction. Optionally, the third CSI reporting configuration corresponds to the predicted report quantity. Optionally, the UE may report the predicted report quantity based on the third CSI reporting configuration. Optionally, the report quantity may include at least one of CRI, SSBRI, L1-RSRP, LI-SINR, PMI, RI, CQI, and LI. Optionally, the third CSI reporting configuration may indicate configuration of one or more reference signals. Optionally, the third CSI reporting configuration may indicate configuration of one or more reference signals for channel measurement. Optionally, the third CSI reporting configuration may indicate configuration of one or more reference signals for interference measurement.

[0438] Optionally, the UE may transmit the corresponding CSI report based on the third CSI reporting configuration. Optionally, the UE may determine / generate the corresponding CSI based on measurement of the reference signal indicated by the third CSI reporting configuration. Optionally, the UE may transmit the corresponding CSI report based on measurement of the reference signal indicated by the third CSI reporting configuration.

[0439] For model inference of the AI / ML model on the UE side, since the total computing resources of the UE are limited, it is necessary to specify / determine the computing resources required by the UE during model inference (or prediction) so that the base station may reasonably allocate the computing resources of the UE. In the disclosure, the term “computing resource” may be used interchangeably with at least one of the terms “computing power”, “computing capability”, “occupied computing resource”, “consumed computing resource”, “processing resource”, “processing unit (PU)”. Optionally, the computing resource may be for AI / ML. Optionally, the computing resource may be for simultaneous calculation. Optionally, the computing resource may be for storage. Optionally, the computing resource may be for storage for AI / ML related calculation. Optionally, the computing resource may be for CSI calculation. Optionally, the computing resource may be for prediction. Optionally, the computing resource may be for computing the predicted CSI. Optionally, the computing resource may be a processing unit different from the CPU. Optionally, the computing resource may be a processing unit regardless of the CPU. Optionally, the computing resource may be a processing unit independent of the CPU. Optionally, the CSI report corresponding to / associated with the third CSI reporting configuration may occupy only the CPU, or only the PU, or both the CPU and the PU. Optionally, the computing resource is for the CSI report associated with the third CSI reporting configuration. The CSI processing criteria is described below taking PU as an example.

[0440] Optionally, the UE may report the value of supported by the UE via UE capability signaling, where NPU represents the number of PUs, or represents the maximum number of PUs. Optionally, the UE may report calculations (e.g., CSI calculations) supported by the UE via UE capability signaling. Optionally, the UE indicates the number of supported simultaneous calculations with first parameter in a component carrier, and / or second parameter across all component carriers.

[0441] Optionally, if a UE supports simultaneous calculations, it is said to have processing units for processing CSI reports. If PUs are occupied for calculation of CSI reports in a given OFDM symbol, the UE has unoccupied PUs. Here, the CSI report may include the CSI report associated with the third CSI reporting configuration. In the disclosure, the term “OFDM symbol” may be used interchangeably with the term “time domain unit”.

[0442] Optionally, the UE may determine whether at least one CSI report (e.g., each CSI report) of CSI reports is updated based on priorities and / or PU occupation (e.g., the occupation of the PU, or the number of unoccupied PU(s)) corresponding to the CSI reports. If CSI reports start occupying their respective PUs on the same OFDM symbol on which NPU- LPUPUs are unoccupied, where each CSI report corresponds to , the UE is not required to update the (requested) CSI reports with lowest priority, where is the largest value such that holds. Processing of a CSI report occupies a number of PUs for a number of symbols. In the disclosure, the term “OFDM symbol” may be used interchangeably with the term “time domain unit”.

[0443] Optionally, the NAI CSI reports do not include the CSI report corresponding to / associated with the third CSI reporting configuration. Optionally, the NAI CSI reports do not include the CSI report corresponding to / associated with the third CSI reporting configuration satisfying a fourth condition.

[0444] Optionally, in order to determine whether at least one CSI report (e.g., each CSI report) of the CSI reports is updated, the UE assumes that the CSI reports do not include the CSI report corresponding to / associated with the third CSI reporting configuration. Optionally, in order to determine whether at least one CSI report (e.g., each CSI report) of the CSI reports is updated, the UE assumes that the NAI CSI reports do not include the CSI report corresponding to / associated with the third CSI reporting configuration satisfying the fourth condition.

[0445] Optionally, the number of PUs occupied by the CSI report corresponding to / associated with the third CSI reporting configuration of the NAI CSI reports is 0 (e.g., =0). Optionally, the number of PUs occupied by the CSI report corresponding to / associated with the third CSI reporting configuration satisfying the fourth condition of the NAI CSI report is 0 (e.g., =0).

[0446] Optionally, the CSI report corresponding to / associated with the third CSI reporting configuration of the NAI CSI reports is not updated. Optionally, the CSI report corresponding to / associated with the third CSI reporting configuration and satisfying the fourth condition of the CSI reports is not updated.

[0447] Optionally, in order to determine whether at least one CSI report (e.g., each CSI report) of the CSI reports is updated, the UE assumes that the number of PUs occupied by the CSI report corresponding to / associated with the third CSI reporting configuration of the CSI reports is 0 (e.g., =0), and / or the CSI report corresponding to / associated with the third CSI reporting configuration of the CSI reports is not updated. Optionally, in order to determine whether at least one CSI report (e.g., each CSI report) of the CSI reports is updated, the UE assumes that the number of PUs occupied by the CSI report corresponding to / associated with the third CSI reporting configuration satisfying the fourth condition the CSI reports is 0 (e.g., =0), and / or the CSI report corresponding to / associated with the third CSI reporting configuration and satisfying the fourth condition of the CSI reports is not updated.

[0448] Optionally, the fourth condition includes at least one of the followings: 1) the CSI report corresponding to / associated with the third CSI reporting configuration occupied CPU(s); 2) the CSI report corresponding to / associated with the third CSI reporting configuration occupies PU(s); 3) the CSI report corresponding to / associated with the third CSI reporting configuration is not updated. Optionally, the CSI report being not updated means that it is not required to be updated. Optionally, the CSI report being not updated means that the CSI report is determined to be not required to be updated based on the CPU-related method. Refer above for the method for determining whether the CSI report is updated based on the CPU. Optionally, the CSI report being not updated means that the CSI report is not required to be updated for the same OFDM symbol (e.g., for OFDM symbols related to the NAI CSI reports). Optionally, the UE determines whether the CSI report is updated based on the PU and / or CPU on the same symbol (e.g., OFDM symbol).

[0449] Optionally, the fourth condition includes at least one of the followings: 1) the CSI report corresponding to / associated with the third CSI reporting configuration is not in M; 2) the CSI report corresponding to / associated with the third CSI reporting configuration is not in .

[0450] Optionally, the CSI report being not in M may include: the CSI report being not considered in M, or the CSI report being not in M CSI reports, or the CSI report being not considered in the M CSI reports, or the CSI report being in N-M CSI reports, or the CSI report being considered in the N-M CSI reports. Optionally, the M CSI reports may be M CSI reports that are updated. Optionally, the M CSI reports may be CSI reports numbered from 0 to M-1. Optionally, the N-M CSI reports may be N-M CSI reports that are not updated. Optionally, the N-M CSI reports may be CSI reports numbered from M to N-1. Optionally, being updated may include being required to be updated. Optionally, being not updated may include being not required to be updated. Refer above for the determination method of M and / or the determination method of the M CSI reports and / or the determination method of the N-M CSI reports.

[0451] Optionally, the CSI report being not in may include: the CSI report being not considered in , or the CSI report being not in CSI reports, or the CSI report being not considered in CSI reports, or the CSI report being in CSI reports, or the CSI report being considered in CSI reports. Optionally, the CSI reports may be CSI reports that are updated. Optionally, the CSI reports may be CSI reports numbered from 0 to -1. Optionally, the CSI reports may be CSI reports that are not updated. Optionally, the CSI reports may be CSI reports numbered from to -1. Optionally, being updated may include being required to be updated. Optionally, being not updated may include being not required to be updated. Refer above for the determination method of and / or the determination method of the CSI reports and / or the determination method of the CSI reports.

[0452] In order to determine whether at least one CSI report (or each CSI report) of the N CSI reports is updated, or in order to determine whether at least one CSI report (or each CSI report) of the NAI CSI reports is updated, the UE may assume that the number of PUs and / or CPUs occupied by the CSI report corresponding to / associated with the third CSI reporting configuration of the NAI CSI reports is 0 based on M and / or . Refer above for details. When the number of CPUs and / or PUs occupied by some CSI reports corresponding to / associated with the third CSI reporting configuration is considered as 0, M and / or will change. This will cause different understanding of M and / or between the UE and the base station, resulting in the CSI report being not updated correctly. The following method can define how M and / or are determined, avoiding different understanding of M and / or between the UE and the base station and improving the reliability of the communication system. Optionally, M and / or are determined prior to the number of the occupied CPUs and / or the occupied PUs corresponding to the CSI report considered to be 0. Optionally, the CSI report includes the CSI report corresponding to / associated with the third CSI reporting configuration. Optionally, the CSI report includes any of CSI report(s), or at least one CSI report, or all CSI report(s). Optionally, the CSI report includes any CSI report of the N CSI reports, or at least one CSI report of the N CSI reports, or all CSI report(s) of the N CSI reports. Optionally, the CSI report includes any CSI report of the NAICSI reports, or at least one CSI report of the NAI CSI reports, or all CSI report(s) of the NAI CSI reports. Optionally, the CPU occupied by the CSI report corresponding to / associated with the third CSI reporting configuration includes at least one of the followings: 1) the number of CPU occupied by the CSI report corresponding to / associated with the third CSI reporting configuration is (e.g., ) greater than 0; 2) the number of CPU occupied by the CSI report corresponding to / associated with the third CSI reporting configuration is (e.g., ) equal to a first value; 3) the number of CPU occupied by the CSI report corresponding to / associated with the third CSI reporting configuration is (e.g., ) greater than the first value. The first value may be a positive integer. For example, the first value may be one of 1, 2, 3, 4, 5, 6, 7, 8.

[0453] Optionally, the PU occupied by the CSI report corresponding to / associated with the third CSI reporting configuration includes at least one of the followings: 1) the number of PU occupied by the CSI report corresponding to / associated with the third CSI reporting configuration is (e.g., ) greater than 0; 2) the number of PU occupied by the CSI report corresponding to / associated with the third CSI reporting configuration is (e.g., ) greater than or equal to a second value. The second value may be a positive integer. For example, the second value may be one of 1, 2, 3, 4, 5, 6, 7, 8.

[0454] Optionally, the UE first determines whether one or more CSI reports are updated (e.g., whether they may be updated) based on the CPU, and then determines whether the one or more CSI reports are updated based on the PU. Optionally, the UE first determines whether the CSI report is to be updated based on the CPU, and then determines whether the CSI report is to be updated based on the PU. For example, for an OFDM symbol, the UE first determines that Y CSI reports are not updated based on the CPU, Y≥0. For the OFDM symbol, the UE then excludes the CSI report same as at least one CSI report of the Y CSI reports in the above NAI CSI reports, and performs the above operation (e.g., operation for determining whether the CSI report is updated, or operation for determining whether the CSI report is updated based on the PU) based on the remaining CSI report(s). For example, for an OFDM symbol, the UE first determines that Y CSI reports are not updated based on the CPU, Y≥0. For the OFDM symbol, the UE then performs the above operation (e.g., operation for determining whether the CSI report is updated, or operation for determining whether the CSI report is updated based on the PU) based on the CSI report that is not the Y CSI reports (or is not at least one CSI report of the Y CSI reports) of the NAI CSI reports. For example, for an OFDM symbol, the UE first determines that Y CSI reports are updated based on the CPU, Y≥0. For the OFDM symbol, the UE then performs the above operation (e.g., operation for determining whether the CSI report is updated, or operation of determining whether the CSI report is updated based on the PU) based on the CSI report that is the Y CSI reports (or is at least one CSI report of the Y CSI reports) of the NAI CSI reports.

[0455] The above method may allow the UE to first determine which CSI reports are not updated based on the CPU. Since these CSI reports that are not updated do not need to occupy corresponding PUs, when which CSI reports are not updated is determined based on the CPU, these CSI reports may be excluded through the above method, avoiding repetitive calculation increasing the number of CSI reports that may be updated and improving the efficiency of the system.

[0456] Optionally, the value of N may be the same as the value of NAI. Optionally, the NAI CSI reports may be the same as the N CSI reports. Optionally, the UE may determine whether the CSI report is updated based on the smaller value of M and MAI. For example, k is equal to the smaller / larger value of M and MAI. For example, k is equal to the minimum / maximum value of M and MAI. k CSI reports (e.g., CSI report n=0, …, k-1) may be assumed as the CSI reports that are updated. The (remaining) N-k CSI reports may be assumed as the CSI reports that are not updated (or the CSI reports that are not required to be updated).

[0457] The above method may allow the UE to determine whether the CSI report is updated based on the CPU and PU, preventing the resources occupied by the CSI report from exceeding the upper limit and improving the reliability of the system.

[0458] Optionally, the number of CPUs occupied by the CSI report associated with / corresponding to the third CSI reporting configuration may be predefined, or indicated by the UE (e.g., reported by the UE), or indicated by the base station (e.g., indicated via RRC signaling). Optionally, the number of CPUs occupied by the CSI report associated with / corresponding to the third CSI reporting configuration may be a non-negative integer. Optionally, the number of CPUs occupied by the CSI report associated with / corresponding to the third CSI reporting configuration may be 0 or 1. For example, =0, or =1.

[0459] Optionally, the number of PUs occupied by the CSI report associated with / corresponding to the third CSI reporting configuration may be predefined, or indicated by the UE (e.g., reported by the UE), or indicated by the base station (e.g., indicated via RRC signaling). Optionally, the number of PUs occupied by the CSI report associated with / corresponding to the third CSI reporting configuration may be an integer ranged from 0 to Y. Y may be 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16.

[0460] Optionally, the number of PUs occupied by the CSI report associated with / corresponding to the first CSI reporting configuration may be predefined, or indicated by the UE (e.g., reported by the UE), or indicated by the base station (e.g., indicated via RRC signaling). Optionally, the number of PUs occupied by the CSI report associated with / corresponding to the first CSI reporting configuration may be 0 or 1. For example, =0.

[0461] Optionally, the UE may report / indicate the number of PUs occupied by the CSI report via UE capability signaling. Optionally, the UE may report / indicate the number of CPUs occupied by the CSI report via UE capability signaling.

[0462] Optionally, the UE may indicate the number of PUs occupied by the CSI report through an applicability report. Optionally, the UE may indicate the number of CPUs occupied by the CSI report through the applicability report.

[0463] Optionally, if the CSI report associated with / corresponding to the third CSI reporting configuration occupies CPU(s) and the CSI report associated with / corresponding to the third CSI reporting configuration also occupies PU(s), the time domain resource (e.g., OFDM symbol) of the PU occupied by the CSI report associated with / corresponding to the third CSI reporting configuration is the same as the time domain resource (e.g., OFDM symbol) of the CPU occupied by the CSI report associated with / corresponding to the third CSI reporting configuration. In the disclosure, the CSI report being updated may include at least one of the followings: 1) the CSI in the CSI report being updated; 2) the CSI in the CSI report being calculated / processed; 3) the CSI in the CSI report being valid; 4) the CSI report being processed.

[0464] In the disclosure, the CSI report being not updated may include at least one of the followings: 1) the CSI in the CSI report being not updated; 2) the CSI in the CSI report being not calculated / processed; 3) the CSI in the CSI report being invalid; 4) the CSI report being not processed.

[0465] In the disclosure, the CSI report being not required to be updated may include at least one of the followings: 1) the CSI in the CSI report being not required to be updated; 2) the CSI in the CSI report being not required to be calculated / not required to be processed; 3) the CSI in the CSI report being not required to be valid; 4) the CSI report being not required to be processed.

[0466] FIG. 5 illustrates a method 500 performed by a base station according to various embodiments of the disclosure. The method 500 includes: at 501, the base station transmits a first channel state information (CSI) reporting configuration for Layer 1 / Layer 2 triggered mobility (LTM), where the first CSI reporting configuration includes configuration information of a resource set for channel measurement, the configuration information of the resource set for channel measurement indicates K CSI-RS resource identifiers IDs and K LTM candidate configuration IDs, K≥1, where the k-th CSI-RS resource ID of the K CSI-RS resource IDs is associated with the k-th LTM candidate configuration ID of the K LTM candidate configuration IDs, 1≤k≤K, the first CSI reporting configuration further includes first configuration information of L candidate cells, where each of the L first configuration information indicates at least one of a codebook parameter, a port indication for non-PMI feedback, and a frequency domain configuration parameter, and L is equal to the number of LTM candidate configuration IDs after duplicated IDs of the K LTM candidate configuration IDs being removed, the LTM candidate configuration ID of the i-th candidate cell of the L candidate cells is the i-th LTM candidate configuration ID after the duplicated IDs of the K LTM candidate configuration IDs being removed, where 1≤i≤L; and at 502, the base station receives CSI report of N candidate cells of the L candidate cells based on the first CSI reporting configuration, 1≤N≤L, where the N candidate cells are determined based on at least one of the followings: values of CQI of the L candidate cells; the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration; whether the N candidate cells exclude the current special cell.

[0467] FIG. 6 illustrates a structure 600 of a user equipment according to various embodiments of the disclosure. As shown in FIG. 6, the user equipment 600 includes a controller 610 and a transceiver 620, where the controller 610 is configured to perform various methods disclosed herein as performed by the user equipment, and the transceiver 620 is configured to transmit and receive channels or signals.

[0468] FIG. 7 illustrates a structure 700 of a base station according to various embodiments of the disclosure. As shown in FIG. 7, the network device 700 includes a controller 710 and a transceiver 720, where the controller 710 is configured to perform various methods disclosed herein as performed by the network device, and the transceiver 720 is configured to transmit and receive channels or signals.

[0469] Furthermore, “at least one of / at least one” described in the present disclosure includes any and / or all possible combinations of the listed items, and various embodiments and various examples of the embodiments described in the present disclosure may be changed and combined in any appropriate form, and “ / ” described in the present disclosure means “or”.

[0470] The various illustrative logical blocks, modules, and circuits described in the present disclosure may be implemented or performed with a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. The general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0471] The steps of a method or algorithm described in this disclosure may be embodied directly in hardware, in a software module executed by a processor, or in a combination of both. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, a removable disk, or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor such the processor can read information from, and write information to, the storage medium. In the alternative, the storage medium may be integrated to the processor. The processor and the storage medium may reside in an ASIC. The ASIC may reside in a user terminal. In the alternative, the processor and the storage medium may reside as discrete components in a user terminal.

[0472] In one or more exemplary designs, the functions described may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored in computer-readable media or transmitted over computer-readable media as one or more instructions or code. Computer-readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. Storage media may be any available media that can be accessed by a general purpose or special purpose computer.

[0473] The description set forth herein, in connection with the appended drawings, describes example configurations, methods, and apparatuses and does not represent all the examples that may be implemented or that are within the scope of the claims. The term “example” used herein means “serving as an example, instance, or illustration,” and not “preferred” or “advantageous over other examples”. The detailed description includes specific details for the purpose of providing an understanding of the described techniques. These techniques, however, may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

[0474] While this specification contains many specific implementation details, these should not be construed as limitations on the scope of any inventions or of what may be claimed, but rather as descriptions of features specific to particular embodiments of particular inventions. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Moreover, although features may be described above as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be deleted from the combination, and the claimed combination may be directed to a subcombination or variation of the subcombination.

[0475] It is to be understood that the specific order or hierarchy of steps in the methods of the present disclosure is an illustration of exemplary processes. Based on design preferences, it is understood that the specific order or hierarchy of steps in the methods may be rearranged to achieve the functions and effects disclosed in the present disclosure. The accompanying method claims present elements of the various steps in an example order, and are not meant to be limited to the specific order or hierarchy presented unless specifically recited therein. Furthermore, although elements may be described or claimed in the singular, the plural form is contemplated unless limitation to the singular is explicitly stated. Accordingly, the disclosure is not limited to illustrated examples and any means for performing the function described herein are included in aspects of the disclosure.

[0476] The text and drawings are provided as examples only to aid the reader in understanding the present disclosure. They are not intended, nor should they be construed, to limit the scope of the disclosure in any way. Although certain embodiments and examples have been provided, it will be apparent to those skilled in the art, based on this disclosure, that changes can be made to the embodiments and examples shown without departing from the scope of the disclosure.

Claims

1.A method performed by a user equipment (UE) in a communication system, the method comprising:receiving a first channel state information (CSI) reporting configuration and a second CSI reporting configuration for Layer 1 / Layer 2 triggered mobility (LTM),wherein the first CSI reporting configuration includes configuration information of a resource set for channel measurement, the configuration information of the resource set for channel measurement indicates K CSI reference signal (CSI-RS) resource identifiers (IDs) and K LTM candidate configuration IDs, K≥1, wherein the k-th CSI-RS resource ID of the K CSI-RS resource IDs is associated with the k-th LTM candidate configuration ID of the K LTM candidate configuration IDs, where 1≤k≤K, andwherein the first CSI reporting configuration further includes L first configuration information of L candidate cells, wherein each of L first configuration information indicates at least one of a codebook parameter, a port indication for non-precoding matrix indicator (PMI) feedback, and a frequency domain configuration parameter, and L is equal to a number of LTM candidate configuration IDs after duplicated IDs of the K LTM candidate configuration IDs being removed, wherein the LTM candidate configuration ID of the i-th candidate cell of the L candidate cells is the i-th LTM candidate configuration ID after the duplicated IDs of the K LTM candidate configuration IDs being removed, where 1≤i≤L; andperforming at least one of:reporting CSI of N candidate cells of the L candidate cells based on the first CSI reporting configuration, 1≤N≤L,determining whether to report the CSI report corresponding to the first CSI reporting configuration based on the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration, ordropping the CSI report corresponding to the first CSI reporting configuration in case that the L candidate cells are a current special cell;wherein the N candidate cells are determined based on at least one of:values of channel quality indicators (CQIs) of the L candidate cells;the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration; orwhether the N candidate cells exclude the current special cell.2.The method of claim 1, wherein the j-th LTM candidate configuration ID of the L LTM candidate configuration IDs after the duplicated IDs of the K LTM candidate configuration IDs being removed is smaller than the (j+1)-th LTM candidate configuration ID, where 1≤j≤L-1.3.The method of claim 1, wherein the CSI-RS resource corresponding to the i-th candidate cell of the L candidate cells is determined based on the LTM candidate configuration ID of the i-th candidate cell, andwherein the CSI-RS resource corresponding to the i-th candidate cell of the L candidate cells is one or more CSI-RS resources of the K CSI-RS resources with associated LTM candidate configuration ID being the same as the LTM candidate configuration ID of the i-th candidate cell.4.The method of claim 1, wherein N is determined by at least one of:N being indicated by the first CSI reporting configuration;N being indicated by a trigger state corresponding to the first CSI reporting configuration indicated by medium access control control element (MAC-CE) or downlink control information (DCI); orN being determined by the UE.5.The method of claim 1, wherein the CSI report corresponding to the second CSI reporting configuration further includes layer 1-reference signal received power (L1-RSRP) corresponding to the resource indicator and the CSI report corresponding to the second CSI reporting configuration is the latest CSI report before the report carrying CSI of the N candidate cells of the L candidate cells, andwherein the method further comprises:in case that the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration is different from the L candidate cells, dropping the report carrying the CSI of the N candidate cells of the L candidate cells.6.The method of claim 1, further comprising:in case that the L candidate cells are the current special cell and the CSI report corresponding to the first CSI reporting configuration is periodic CSI report, dropping the CSI report corresponding to the first CSI reporting configuration.7.The method of claim 1, wherein whether the N candidate cells excluding the current special cell is indicated by the first CSI reporting configuration, andwherein in case that the N candidate cells exclude the current special cell, the N candidate cells are N candidate cells of L-1 cells of the L candidate cells not corresponding to the current special cell.8.The method of claim 1, wherein the CSI of each of the N candidate cells includes Krep groups of CSI, where each of the Krep groups of CSI includes at least one of CSI-RS resource indicator (CRI), PMI, rank indicator (RI), CQI, layer indicator (LI),wherein at least one of the followings is met:Krep=1,Krep being indicated by the first configuration information corresponding to each candidate cell, orKrep being indicated by the first CSI reporting configuration,wherein the CSI-RS resource corresponding to the Krep groups of CSI are determined based on at least one of:the value of the CQI corresponding to the CSI-RS resource; orthe resource corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration,wherein in case that the N candidate cells do not exclude the current special cell:in case that N=L and / or K1>1, the value k1 of the CRI in the CSI of the n-th candidate cell of the N candidate cells corresponds to the (k1+1)-th CSI-RS resource corresponding to the n-th candidate cell, 0≤k1≤K1-1, 11≤n≤N; orin case that N=L and / or K1=1, no CRI is included in the CSI of the N candidate cells; orin case that N<L, the value k2 of the CRI in the CSI of the N candidate cells corresponds to the (k2+1)-th CSI-RS resource in the resource set configured by the configuration information of the resource set for channel measurement, where 0≤k2≤K-1,wherein in case that the N candidate cells exclude the current special cell:in case that N=L and / or K1>1, the value k1 of the CRI in the CSI of the N-th candidate cell of the N candidate cells corresponds to the (k1+1)-th CSI-RS resource corresponding to the n-th candidate cell, 0≤k1≤K1-1, 1≤n≤N; orin case that N=L-1 and / or K1=1, no CRI is included in the CSI of the N candidate cells; orin case that N<L-1, the value k2 of the CRI in the CSI of the N candidate cells corresponds to the (k2+1)-th CSI-RS resource in the resource set configured by the configuration information of the resource set for channel measurement, where 0≤k2≤K-1, andwherein K1 is the number of the CSI-RS resources corresponding to the n-th candidate cell.9.The method of claim 1, wherein the mapping order of the CSI of the N candidate cells is determined based on at least one of the values of LTM candidate configuration IDs corresponding to the N candidate cells or whether the candidate cells are the current special cell, andwherein:in case that the N candidate cells include the candidate cell corresponding to the current special cell, the CSI of the candidate cell of the N candidate cells not corresponding to the current special cell is before the CSI of the candidate cell of the N candidate cell corresponding to the current special cell, and the mapping order of the CSI of the candidate cell of the N candidate cells not corresponding to the current special cell is determined based on the ascending order of the values of the LTM candidate configuration IDs corresponding to the N candidate cells; orin case that the N candidate cells do not include the candidate cell corresponding to the current special cell, the mapping order of the CSI of the N candidate cells is determined based on the ascending order of the values of the LTM candidate configuration IDs corresponding to the N candidate cells.10.A user equipment (UE) in a communication system, the UE comprising:at least one transceiver;at least one processor communicatively coupled to the at least one transceiver; andat least one memory, communicatively coupled to the at least one processor, storing instructions executable by the at least one processor individually or in any combination to cause the UE to:receive a first channel state information (CSI) reporting configuration and a second CSI reporting configuration for Layer 1 / Layer 2 triggered mobility (LTM),wherein the first CSI reporting configuration includes configuration information of a resource set for channel measurement, the configuration information of the resource set for channel measurement indicates K CSI reference signal (CSI-RS) resource identifiers (IDs) and K LTM candidate configuration IDs, K≥1, wherein the k-th CSI-RS resource ID of the K CSI-RS resource IDs is associated with the k-th LTM candidate configuration ID of the K LTM candidate configuration IDs, where 1≤k≤K, andwherein the first CSI reporting configuration further includes L first configuration information of L candidate cells, wherein each of L first configuration information indicates at least one of a codebook parameter, a port indication for non-precoding matrix indicator (PMI) feedback, and a frequency domain configuration parameter, and L is equal to a number of LTM candidate configuration IDs after duplicated IDs of the K LTM candidate configuration IDs being removed, wherein the LTM candidate configuration ID of the i-th candidate cell of the L candidate cells is the i-th LTM candidate configuration ID after the duplicated IDs of the K LTM candidate configuration IDs being removed, where 1≤i≤L; andperform at least one of:reporting CSI of N candidate cells of the L candidate cells based on the first CSI reporting configuration, 1≤N≤L,determining whether to report the CSI report corresponding to the first CSI reporting configuration based on the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration, ordropping the CSI report corresponding to the first CSI reporting configuration in case that the L candidate cells are a current special cell;wherein the N candidate cells are determined based on at least one of:values of channel quality indicators (CQIs) of the L candidate cells;the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration; orwhether the N candidate cells exclude the current special cell.11.The UE of claim 9, wherein the j-th LTM candidate configuration ID of the L LTM candidate configuration IDs after the duplicated IDs of the K LTM candidate configuration IDs being removed is smaller than the (j+1)-th LTM candidate configuration ID, where 1≤j≤L-1.12.The UE of claim 9, wherein the CSI-RS resource corresponding to the i-th candidate cell of the L candidate cells is determined based on the LTM candidate configuration ID of the i-th candidate cell, andwherein the CSI-RS resource corresponding to the i-th candidate cell of the L candidate cells is one or more CSI-RS resources of the K CSI-RS resources with associated LTM candidate configuration ID being the same as the LTM candidate configuration ID of the i-th candidate cell.13.The UE of claim 9, wherein N is determined by at least one of:N being indicated by the first CSI reporting configuration;N being indicated by a trigger state corresponding to the first CSI reporting configuration indicated by medium access control control element (MAC-CE) or downlink control information (DCI); orN being determined by the UE.14.The UE of claim 9, wherein the CSI report corresponding to the second CSI reporting configuration further includes layer 1-reference signal received power (L1-RSRP) corresponding to the resource indicator and the CSI report corresponding to the second CSI reporting configuration is the latest CSI report before the report carrying CSI of the N candidate cells of the L candidate cells, andwherein the instructions cause the UE to:in case that the candidate cell corresponding to the resource indicator indicated by the CSI report corresponding to the second CSI reporting configuration is different from the L candidate cells, dropping the report carrying the CSI of the N candidate cells of the L candidate cells.15.The UE of claim 9, wherein the instructions cause the UE to: in case that the L candidate cells are the current special cell and the CSI report corresponding to the first CSI reporting configuration is periodic CSI report, drop the CSI report corresponding to the first CSI reporting configuration.

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