Method and device for receiving and transmitting information

Abstract

The disclosure provides a method and device for receiving and transmitting information, and more particularly provides a method performed by a user equipment UE in a wireless communication system and the UE performing the method. The method includes receiving a channel state information (CSI) reporting configuration; receiving downlink channels; and reporting, based on the CSI reporting configuration, CSI determined based on reference signals associated with K downlink channels, K is predefined or indicated by the CSI reporting configuration, and K≥1, wherein the K downlink channels satisfy at least one of the followings: the K downlink channels have HARQ-ACK information; number of frequency domain units of the K downlink channels are the same; number of frequency domain units of the K downlink channels are greater than or equal to a frequency domain threshold.

Description

METHOD AND DEVICE FOR RECEIVING AND TRANSMITTING INFORMATION

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

[0002] 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.

[0003] 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.

[0004] 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.

[0005] 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 procedure (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.

[0006] 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.

[0007] 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.

[0008] In order to enhance the scheduling efficiency of the 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.

[0009] An aspect of the disclosure provides a method performed by a user equipment (UE) in a wireless communication system, the method includes receiving a channel state information (CSI) reporting configuration; receiving downlink channels; and reporting CSI determined based on reference signals associated with K downlink channels, based on the CSI reporting configuration, where K is predefined or indicated by the CSI reporting configuration, and K≥1, wherein the K downlink channels satisfy at least one of the followings: the K downlink channels have hybrid automatic repeat request acknowledgement (HARQ-ACK) information; a number of frequency domain units of the K downlink channels is the same; the number of frequency domain units of the K downlink channels is greater than or equal to a frequency domain threshold.

[0010] In an example, the K downlink channels further satisfy at least one of the followings: the K downlink channels are in a first cell; the K downlink channels are within a time window; transmission configuration indication (TCI) states of the K downlink channels are the same; transmission occasions corresponding to the K downlink channels are not in a time domain unit for uplink; a second time domain unit associated with an uplink channel carrying CSI of the K downlink channels is no earlier than a first time domain unit associated with the K downlink channels; the K downlink channels are K semi-persistent scheduling (SPS) physical downlink shared channels (PDSCHs); the K downlink channels are K dynamically scheduled PDSCHs; wherein the first cell is predefined or indicated by a base station, and the time window is predefined or indicated by the base station.

[0011] In an example, the HARQ-ACK information for the K downlink channels and the CSI are reported on the same uplink channel; and / or the HARQ-ACK information for the K downlink channels and the CSI are triggered by the same first downlink control information (DCI).

[0012] In an example, the method further includes determining whether to update the CSI based on at least one of the followings: the HARQ-ACK information for at least one downlink channel of the K downlink channels; a number of frequency domain units of at least one downlink channel of the K downlink channels; a time domain position of a reference signal associated with at least one downlink channel of the K downlink channels and a time domain position of an uplink channel carrying the CSI.

[0013] In an example, time domain separation of the second time domain unit and the first time domain unit is greater than or equal to a time domain threshold, and wherein the time domain threshold is determined based on at least one of content of the CSI or a UE capability.

[0014] In an example, the method further includes detecting second downlink control information (DCI), wherein the second DCI triggers an aperiodic CSI report to carry the CSI, and the K downlink channels further satisfy at least one of the followings: the K downlink channels are the latest K downlink channels before a downlink channel carrying the second DCI; the HARQ-ACK information for the K downlink channels is acknowledgment (ACK); the HARQ-ACK information for the K downlink channels is reported before the second DCI; the K downlink channels are physical downlink shared channels (PDSCHs); the transmission configuration indication (TCI) states of the K downlink channels are the same as an indicated TCI state.

[0015] In an example, the method further includes receiving higher layer signaling, wherein the higher layer signaling triggers a periodic CSI report and / or a semi-persistent CSI report to carry the CSI, and the K downlink channels further satisfy at least one of the followings: the K downlink channels are between a first CSI report for carrying the CSI and the latest CSI report based on the CSI reporting configuration before the first CSI report; the HARQ-ACK information for the K downlink channels is ACK.

[0016] In an example, the reference signals associated with the K downlink channels include at least one of the followings: a reference signal associated with a downlink channel corresponding to the last information bit in the HARQ-ACK information for the K downlink channels; a reference signal associated with the last downlink channel of the K downlink channels in a time domain; a reference signal associated with a downlink channel with the latest first DCI corresponding to the K downlink channels; a reference signal associated with each downlink channel of the K downlink channels.

[0017] In an example, if a reference signal associated with a k-th downlink channel of the K downlink channels is used for determining the CSI, the CSI is determined based on measurement quantities of all ports associated with a first TCI state of ports of the reference signal associated with the k-th downlink channel, and wherein the first TCI state is a predefined TCI state of Y TCI states associated with the k-th downlink channel, or a TCI state indicated by the CSI reporting configuration, 1≤k≤K, Y≥1.

[0018] In an example, the determination of the CSI is further based on an assumption that an offset between Energy Per Resource Element (EPRE) of a downlink channel for CSI computation and EPRE of the K downlink channels is equal to a specific value, wherein the specific value is predefined or indicated by the base station.

[0019] In an example, the CSI includes a Layer 1-Reference Signal Received Power (L1-RSRP) and / or a channel quality indicator (CQI), wherein the L1-RSRP and / or the CQI are determined based on an assumption that EPRE of the reference signals associated with the K downlink channels are the same.

[0020] In an example, the CSI includes CQI, wherein the CQI is determined based on at least one of the followings associated with the K downlink channels: reference resources, reference signals, modulation schemes, code rates, transport block TB sizes, spatial domain parameters, redundancy versions, and wherein the reference resources include time domain resources and / or frequency domain resources in which the K downlink channels are scheduled; the reference signals include reference signals indicated for the K downlink channels; the modulation schemes include modulation schemes indicated for the K downlink channels; the TB sizes include sizes of TBs carried by the K downlink channels; the spatial domain parameters include ranks indicated by the K downlink channels, and / or antenna ports indicated for the K downlink channels; and the redundancy versions include redundancy versions indicator for the K downlink channels.

[0021] In an example, the CSI includes K L1-RSRPs and / or K CQIs, wherein the k-th L1-RSRP and / or the k-th CQI of the K L1-RSRPs and / or K CQIs corresponds to the k-th downlink channel of the K downlink channels, 1≤k≤K.

[0022] In an example, when K>1, the CSI includes a first L1-RSRP and K-1 differential L1-RSRPs, wherein the K-1 differential L1-RSRPs are calculated with reference to the first L1-RSRP, and the first L1-RSRP corresponds to a reference signal associated with a downlink channel with a highest measured L1-RSRP of the reference signals associated with the K downlink channels.

[0023] In an example, the CSI includes a first indicator, wherein the first indicator indicates a downlink channel corresponding to the first L1-RSRP of the K downlink channels, a value p of the first indicator corresponds to the (p+1)-th downlink channel of the K downlink channels, 0≤p≤K-1; a size of a CSI field corresponding to the first indicator is .

[0024] In an example, the frequency domain threshold is predefined, or indicated by a base station, or determined based on a UE capability, or determined based on a size of an active bandwidth part (BWP) receiving the K downlink channels.

[0025] Another aspect of the disclosure provides a method performed by a base station in a wireless communication system, the method includes transmitting a channel state information (CSI) reporting configuration; transmitting downlink channels; and receiving CSI, wherein the CSI is determined based on reference signals associated with K downlink channels, where K is predefined or indicated by the CSI reporting configuration and K≥1, wherein the K downlink channels satisfy at least one of the followings: the K downlink channels have hybrid automatic repeat request acknowledgement (HARQ-ACK) information; a number of frequency domain units of the K downlink channels are the same; the number of the frequency domain units of the K downlink channels are greater than or equal to a frequency domain threshold.

[0026] In an example, the K downlink channels further satisfy at least one of the followings: the K downlink channels are in a first cell; the K downlink channels are within a time window; transmission configuration indication (TCI) states of the K downlink channels are the same; transmission occasions corresponding to the K downlink channels are not in a time domain unit for uplink; a second time domain unit associated with an uplink channel carrying CSI of the K downlink channels is no earlier than a first time domain unit associated with the K downlink channels; the K downlink channels are K semi-persistent scheduling SPS physical downlink shared channels (PDSCHs); the K downlink channels are K dynamically scheduled PDSCHs; wherein the first cell is predefined or indicated by a base station, and the time window is predefined or indicated by the base station.

[0027] In an example, the HARQ-ACK information for the K downlink channels and the CSI are reported on the same uplink channel; and / or the HARQ-ACK information for the K downlink channels and the CSI are triggered by the same first downlink control information (DCI).

[0028] In an example, whether the CSI is updated is determined based on at least one of the followings: the HARQ-ACK information for at least one downlink channel of the K downlink channels; a number of frequency domain units of at least one downlink channel of the K downlink channels; a time domain position of a reference signal associated with at least one downlink channel of the K downlink channels and a time domain position of an uplink channel carrying the CSI.

[0029] In an example, time domain separation of the second time domain unit and the first time domain unit is greater than or equal to a time domain threshold, wherein the time domain threshold is determined based on at least one of content of the CSI or a UE capability.

[0030] In an example, the method further includes transmitting a second downlink control information (DCI), wherein the second DCI triggers an aperiodic CSI report to carry the CSI, and the K downlink channels further satisfy at least one of the followings: the K downlink channels are the latest K downlink channels before a downlink channel carrying the second DCI; the HARQ-ACK information for the K downlink channels is acknowledgment ACK; the HARQ-ACK information for the K downlink channels is reported before the second DCI; the K downlink channels are physical downlink shared channels (PDSCHs); the transmission configuration indication (TCI) states of the K downlink channels are the same as an indicated TCI state.

[0031] In an example, the method further includes transmitting higher layer signaling, wherein the higher layer signaling triggers a periodic CSI report and / or a semi-persistent CSI report to carry the CSI, and the K downlink channels further satisfy at least one of the followings: the K downlink channels are between a first CSI report for carrying the CSI and the latest CSI report based on the CSI reporting configuration before the first CSI report; the HARQ-ACK information for the K downlink channels is ACK.

[0032] In an example, the reference signals associated with the K downlink channels include at least one of the followings: a reference signal associated with a downlink channel corresponding to the last information bit in the HARQ-ACK information for the K downlink channels; a reference signal associated with the last downlink channel of the K downlink channels in time domain; a reference signal associated with a downlink channel with the latest first DCI corresponding to the K downlink channels; a reference signal associated with each downlink channel of the K downlink channels.

[0033] In an example, if a reference signal associated with a k-th downlink channel of the K downlink channels is used for determining the CSI, the CSI is determined based on measurement quantities of all ports associated with a first TCI state of ports of the reference signal associated with the k-th downlink channel, and wherein the first TCI state is a predefined TCI state of Y TCI states associated with the k-th downlink channel, or a TCI state indicated by the CSI reporting configuration, 1≤k≤K, Y≥1.

[0034] In an example, the determination of the CSI is further based on an assumption that an offset between Energy Per Resource Element (EPRE) of a downlink channel for CSI computation and EPRE of the K downlink channels is equal to a specific value, wherein the specific value is predefined or indicated by the base station.

[0035] In an example, the CSI includes a Layer 1-Reference Signal Received Power (L1-RSRP) and / or a channel quality indicator (CQI), wherein the L1-RSRP and / or the CQI are determined based on an assumption that EPRE of the reference signals associated with the K downlink channels are the same.

[0036] In an example, the CSI includes CQI, wherein the CQI is determined based on at least one of the followings associated with the K downlink channels: reference resources, reference signals, modulation schemes, code rates, transport block TB sizes, spatial domain parameters, redundancy versions, and wherein the reference resources include time domain resources and / or frequency domain resources in which the K downlink channels are scheduled; the reference signals include reference signals indicated for the K downlink channels; the modulation schemes include modulation schemes indicated for the K downlink channels; the TB sizes include sizes of TBs carried by the K downlink channels; the spatial domain parameters include ranks indicated for the K downlink channels, and / or antenna ports indicated for the K downlink channels; the redundancy versions include redundancy versions indicator for the K downlink channels.

[0037] In an example, the CSI includes K L1-RSRPs and / or K CQIs, wherein the k-th L1-RSRP and / or the k-th CQI of the K L1-RSRPs and / or K CQIs corresponds to the k-th downlink channel of the K downlink channels, 1≤k≤K.

[0038] In an example, when K>1, the CSI includes a first L1-RSRP and K-1 differential L1-RSRPs, wherein the K-1 differential L1-RSRPs are calculated with reference to the first L1-RSRP, and the first L1-RSRP corresponds to a reference signal associated with a downlink channel with a highest measured L1-RSRP of the reference signals associated with the K downlink channels.

[0039] In an example, the CSI includes a first indicator, wherein the first indicator indicates a downlink channel corresponding to the first L1-RSRP of the K downlink channels, a value p of the first indicator corresponds to the (p+1)-th downlink channel of the K downlink channels, 0≤p≤K-1; a size of a CSI field corresponding to the first indicator is .

[0040] In an example, the frequency domain threshold is predefined, or indicated by a base station, or determined based on a UE capability, or determined based on a size of an active bandwidth part (BWP) receiving the K downlink channels.

[0041] Another aspect of the disclosure provides a user equipment including a transceiver; and a controller coupled with the transceiver, the controller is configured to perform the above methods which may be performed by the user equipment.

[0042] Yet another aspect of the disclosure provides a base station including a transceiver; and a controller coupled with the transceiver, the controller is configured to perform the above methods which may be performed by the controller.

[0043] The method provided by the application improves the performance of CSI, thereby improving the scheduling efficiency of the communication system.

[0044] 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.

[0045] FIG. 1 illustrates an overall structure of an example wireless communication network according to various embodiments of the disclosure;

[0046] FIGs. 2a and 2b respectively illustrate a transmission path 200 and a reception path 250 in a wireless communication network according to various embodiments of the disclosure;

[0047] FIGs. 3a and 3b respectively illustrate structures of a user equipment (UE) and a base station in a wireless communication network according to various embodiments of the disclosure;

[0048] FIG. 4 illustrates a method 400 performed by a user equipment (UE) according to various embodiments of the disclosure;

[0049] FIG. 5 illustrates a method 500 performed by a base station according to various embodiments of the disclosure;

[0050] FIG. 6 illustrates a structure 600 of a user equipment according to various embodiments of the disclosure;

[0051] FIG. 7 illustrates a structure 700 of a base station according to various embodiments of the disclosure.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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".

[0060] 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.

[0061] 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.

[0062] 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.

[0063] The transmission from a base station to a user equipment (UE) is called downlink, and the transmission from the UE to the base station is called uplink.

[0064] 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.

[0065] 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.

[0066] 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).

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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.)

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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).

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 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).

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] 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.

[0096] 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).

[0097] Embodiments of the application are described in detail below with reference to the accompanying drawings.

[0098] 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 is a cyclic prefix added at the beginning of an orthogonal frequency-division multiplexing (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 a time period used for distinguishing uplink and downlink in a time division duplex (TDD) system. 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.

[0099] In the disclosure, a time domain resource may include / correspond to several time domain units.

[0100] 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.

[0101] In the disclosure, the term "A is before B" may be used interchangeably with the term "A is no later than B".

[0102] In the disclosure, the term "A is after B" may be used interchangeably with the term "A is no earlier than B".

[0103] In the disclosure, a frequency domain resource may include / correspond to several frequency domain units.

[0104] 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).

[0105] In the disclosure, a cell may be a serving cell or a non-serving cell. The cell may be at least one of a Primary Cell (PCell), a Primary Secondary Cell (PSCell), a Secondary Cell, and a Special Cell. The Special Cell (SpCell) may be a PCell or a PSCell. In dual connectivity operation, the Special Cell refers to a Primary Cell of a Master Cell Group (MCG) or a Primary Secondary Cell of a Secondary Cell Group (SCG). Otherwise, the Special Cell refers to a Primary Cell. The Special Cell may be a current Special Cell.

[0106] 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.

[0107] In the disclosure, transmit power of a signal may be represented by a capability on each time-frequency unit, for example, Energy Per Resource Element (EPRE).

[0108] 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.

[0109] 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.

[0110] In the disclosure, the time domain resource and / or the frequency domain resource may be referred to as the physical resource.

[0111] In the disclosure, the UE may perform uplink transmission and / or downlink reception on the physical resource.

[0112] In the disclosure, the UE may receive the downlink channel and / or the downlink signal on the physical resource.

[0113] The channel received on the physical resource may be referred to as the downlink physical channel. The Signal received on the physical resource may be referred to as the downlink physical signal. The downlink channel includes the downlink control channel and / or the downlink data channel. The downlink control channel may be the physical downlink control channel (PDCCH). The downlink data channel may be the physical downlink shared channel (PDSCH).

[0114] The signal received on the physical resource may be referred to as the downlink physical signal. The downlink signal may include at least one of the followings: a reference signal for synchronization, a reference signal for demodulation, a reference signal for acquiring a 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. 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 synchronization signal / physical broadcast channel block (SS / PBCH block, SSB).

[0115] In the disclosure, the reference signal for demodulation may be referred to as a demodulation reference signal (DM-RS). The reference signal for phase tracking may be referred to as a phase-tracking reference signal (PT-RS). The reference signal for positioning may be referred to as a positioning reference signal (PRS). The reference signal for acquiring the channel state may be referred to as a channel-state information reference signal (CSI-RS).

[0116] In the disclosure, the UE may transmit the uplink channel and / or the uplink signal on the physical resource.

[0117] The channel transmitted on the physical resource may be referred to as the uplink physical channel. The uplink channel includes at least one of the followings: an uplink control channel, an uplink data channel, and a random access channel. The uplink control channel may be the physical uplink control channel (PUCCH). The uplink data channel may be the physical uplink shared channel (PUSCH). The random access channel may be the physical random access channel (PRACH). In the disclosure, the term "PUCCH" may be used interchangeably with the term "uplink control channel" or "control channel for uplink transmission" or "control channel for uplink" or "channel for uplink control information". In the disclosure, the term "PUSCH" may be used interchangeably with the term "uplink data channel" or "data channel for uplink transmission" or "data channel for uplink".

[0118] The signal transmitted on the physical resource may be referred to as the uplink physical signal. The uplink signal may include at least one of the followings: a reference signal for demodulation, a reference signal for phase tracking, and a reference signal for sounding. The reference signal for sounding may be referred to as a sounding reference signal (SRS).

[0119] 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 reference signal for acquiring the channel state may include at least one of the followings: a reference signal for tracking, a reference signal for CSI acquisition, a reference signal for beam management. The reference signal for beam management includes at least one of the followings: a reference signal for acquiring Layer 1-Reference Signal Received Power (L1-RSRP), a reference signal for acquiring Layer 1-Signal to Interference plus Noise Ratio (L1-SINR). Acquiring L1-RSRP may be calculating L1-RSRP. Acquiring L1-SINR may be calculating L1-SINR.

[0120] In the disclosure, the UE may obtain downlink control information (DCI) via PDCCH.

[0121] In the disclosure, the term "downlink control information" may be used interchangeably with the term "DCI format" or "control information for downlink".

[0122] In the disclosure, the term "PDCCH" may be used interchangeably with the term "downlink control channel" or "control channel for downlink transmission" or "control channel for downlink".

[0123] In the disclosure, the term "PDCCH" may be used interchangeably with the term "PDCCH candidate".

[0124] In the disclosure, a PDCCH may be composed of one or more control channel elements (CCEs). Optionally, one or more CCEs associated with / corresponding to the PDCCH may be the one or more CCEs constituting the PDCCH. An aggregation level (AL) of the PDCCH may be L, where L may be 1, 2, 4, 8, 16. If the aggregation level of a PDCCH is L, the PDCCH is composed of L CCEs, or is associated with / corresponds to L CCEs. The term "aggregation level" and the term "CCE aggregation level" may be used interchangeably.

[0125] In the disclosure, the UE monitors the PDCCH in a search space associated with the control resource ret (CORESET). The PDCCH may be monitored from the search space associated with the control resource set.

[0126] In the disclosure, the term "control resource set" may be used interchangeably with the term "control resource" or "resource for receiving control information" or "resource for monitoring PDCCH" or "resource for detecting control information".

[0127] In the disclosure, the term "search space" may be used interchangeably with the term "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 candidates" or "search space set for searching PDCCH" or "search space set for searching PDCCH candidates". 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 to detect DCI. Optionally, the search space may be used to detect DCI format.

[0128] In the disclosure, the term "PDCCH candidate associated with search space" may be used interchangeably with the term "PDCCH candidate in the search space".

[0129] In the disclosure, a 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.

[0130] 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.

[0131] In the disclosure, monitoring the PDCCH candidate may be receiving the PDCCH candidate and / or decoding according to the monitored DCI format.

[0132] In the disclosure, detecting DCI includes receiving and / or decoding DCI.

[0133] 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.

[0134] In the disclosure, the PDCCH may carry DCI and / or cyclic redundancy check (CRC) corresponding to the DCI, or the DCI and / or the CRC corresponding to DCI may be in the PDCCH. Optionally, the CRC may be scrambled in a specific method. For example, optionally, the CRC may be scrambled based on a Radio Network Temporary Identifier (RNTI). Two PDCCHs having the same scrambling may be the two PDCCHs are 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).

[0135] In the disclosure, the term "information bits of DCI" may be used interchangeably with the term "information bits associated with DCI" or "information bits included in DCI" or "information bits corresponding to DCI". Optionally, the information bits associated with the DCI may include the information bits of the DCI and the check bits (for example, CRC bits) corresponding to the DCI. Optionally, the information bits associated with the DCI may include the information bits of the DCI and bits for checking the DCI (for example, CRC bits).

[0136] 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.

[0137] In the disclosure, DCI may include one or more information fields.

[0138] In the disclosure, the term "size of information field" may be used interchangeably with the term "bitwidth of information field" or "the number of information bits in information field".

[0139] 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.

[0140] 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.

[0141] In the disclosure, when the DCI schedules a channel or signal, a cell receiving or transmitting the channel or signal may be referred to as a scheduled cell. A cell where the DCI is detected or a cell where the DCI is monitored / received may be referred to as a scheduling cell.

[0142] In the disclosure, when the DCI schedules a channel or signal, a BWP receiving or transmitting the channel or signal may be referred to 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 to as a scheduling BWP.

[0143] In the disclosure, the UE may obtain data via PDSCH. The UE may obtain downlink data by reception of the PDSCH.

[0144] In the disclosure, the term "PDSCH" may be used interchangeably with the term "downlink data channel" or "data channel for downlink transmission" or "downlink channel for receiving data" or "downlink channel for carrying data".

[0145] In the disclosure, a PDSCH may carry one or two transport blocks (TBs). When the number of layers corresponding to a PDSCH is less than or equal to 4, the PDSCH carries a TB. When the number of layers corresponding to a PDSCH is greater than 4, the PDSCH carries two TBs.

[0146] In the disclosure, the term "information bits of PDSCH" may be used interchangeably with the term "information bits associated with PDSCH" or "information bits carried by PDSCH" or "information bits of TB included by PDSCH" or "information bits of TB carried by PDSCH". Optionally, the information bits carried by the PDSCH may include the information bits of the TB carried by the PDSCH and the check bits (for example, CRC bits) corresponding to the TB. Optionally, the information bits associated with the PDSCH may include the information bits of the PDSCH / PUSCH and bits used for checking the TB carried by the PDSCH (for example, CRC bits).

[0147] In the disclosure, the term "transport block (TB) is a retransmission" may be used interchangeably with the term "TB is not a new transmission" or "TB is a retransmission TB" or "PUSCH is a PUSCH retransmission" or "new data indicator (NDI) is toggled" or "NDI = 1". In the disclosure, the term "TB is a new transmission" may be used interchangeably with the term "TB is not a retransmission" or "TB is a new transmission TB" or "PUSCH is a PUSCH new transmission / initial transmission" or "NDI is not toggled" or "NDI = 0". The NDI may be the NDI of the TB, or the NDI of the Hybrid Automatic Repeat Request (HARQ) process, or the NDI in DCI, or the NDI in DCI format. The NDI being toggled may be that the NDI provided in the associated HARQ information has been toggled compared to the value in the previous transmission of this TB of this HARQ process. In the disclosure, "NDI = 0" may be DCI in PDCCH with CRC scrambled by CS-RNTI with NDI=0. In the disclosure, "NDI = 1" may be DCI in PDCCH with CRC scrambled by CS-RNTI with NDI=1. The transmission of data may be corrected by Hybrid Automatic Repeat Request (HARQ) with Incremental Redundancy (IR-HARQ) mechanism. The HARQ with Incremental Redundancy combines Automatic Repeat Request (ARQ) and Forward Error Correction (FEC) to improve the reliability and efficiency of data transmission by requesting the sender to retransmit additional redundant data instead of original data when the receiver detects an error. The IR-HARQ mechanism may be implemented through the design of RV. In the IR-HARQ mechanism, the redundant bits generated by the encoder may be divided into several groups, with each RV corresponding to one group of redundant bits. The first transmission and subsequent HARQ retransmission use different RVs respectively to achieve gradual summation of redundant bits to complete HARQ with Incremental Redundancy operations.

[0148] In the disclosure, the transmission of a TB corresponds to the redundancy version (RV) of one TB. The TBs carried in downlink / uplink channels may be indicated with corresponding RVs. Optionally, there are four redundancy versions. These four redundancy versions correspond to numbers 0 to 3, respectively, for example, RV#0, RV#1, RV#2, RV#3. For transmissions of the same TB, the RV may alternate in a predefined order. For example, the RV may be polled in order of RV#0, RV#2, RV#3, RV#1. For example, the RV corresponding to the n-th transmission of a TB is RV#0, then the RV corresponding to the ((n+1) mod 4)-th transmission of the TB is RV#2; the RV corresponding to the ((n+2) mod 4)-th transmission of the TB is RV#3; the RV corresponding to the ((n+3) mod 4)-th transmission of the TB is RV#1. Here, mod represents the remainder operation. A mode B represents the remainder of A divided by B.

[0149] In the disclosure, the PDSCH may be scheduled / indicated by DCI. The PDSCH scheduled / indicated by DCI may be referred to as the dynamically scheduled PDSCH. For example, the PDSCH may be scheduled by DCI format.

[0150] In the disclosure, the PDSCH may be the PDSCH for semi-persistent scheduling (SPS). In the disclosure, the term "PDSCH for semi-persistent scheduling" may be used interchangeably with the term "SPS PDSCH" or "PDSCH without corresponding PDCCH" or "PDSCH scheduled without corresponding PDCCH" or "PDSCH with SPS". Here, the PDCCH may be PDCCH transmission. Optionally, the SPS PDSCH may be scheduled based on higher layer configuration information. Optionally, the higher layer configuration information may be used for configuring downlink semi-persistent transmission. The higher layer configuration information is, for example, SPS-Config. The information for configuring downlink semi-persistent transmission may be referred to as SPS configuration information. Optionally, the SPS PDSCH may be activated by DCI. Optionally, the DCI is scrambled by CS-RNTI or Group CS-RNTI (G-CS-RNTI).

[0151] In the disclosure, a reference signal associated with the downlink channel includes the reference signal for demodulation, and / or the reference signal for phase tracking. For example, the reference signal associated with the downlink channel includes the reference signal for demodulating the downlink channel, and / or the reference signal for phase tracking the downlink channel. The reference signal associated with the downlink channel may be referred to as the reference signal of the downlink channel.

[0152] In the disclosure, the downlink channel may include the downlink channel and the reference signal associated with the downlink channel.

[0153] In the disclosure, the UE may transmit uplink control information (UCI) via the uplink channel.

[0154] In the disclosure, the term "uplink control information (UCI)" may be used interchangeably with the term "control information for uplink".

[0155] In the disclosure, the UCI includes Hybrid Automatic Repeat Request (HARQ) information, information for scheduling request (SR), information for link recovery request (LRR), channel state information (CSI). The Hybrid Automatic Repeat Request information may be Hybrid Automatic Repeat Request-Acknowledgement (HARQ-ACK) information. The information for scheduling request may be referred to as a scheduling request. The information for link recovery request may be referred to as a link recovery request.

[0156] In the disclosure, the UCI includes UCI information bits.

[0157] In the disclosure, the term "UCI information bits" may be used interchangeably with the term "information bits associated with UCI" or "information bits included in UCI" or "information bits corresponding to DCI / UCI". The information bits associated with UCI may include information bits of the UCI and check bits (e.g., CRC bits) corresponding to the UCI. The information bits associated with UCI may include information bits of the UCI and bits used for checking the UCI (e.g., CRC bits).

[0158] In the disclosure, HARQ-ACK information bits may correspond to one or more HARQ-ACK codebooks.

[0159] In the disclosure, HARQ-ACK information may correspond to PDSCH. A HARQ-ACK information bit may correspond to one or more PDSCHs.

[0160] In the disclosure, a HARQ-ACK information bit corresponds to / indicates a positive acknowledgement (ACK) or a negative acknowledgement (NACK). For example, the value of 0 for a HARQ-ACK information bit represents NACK. For example, the value of 1 for a HARQ-ACK information bit represents ACK. For a HARQ-ACK information bit, the UE generates an ACK if the UE correctly decodes a TB. For a HARQ-ACK information bit, the UE generates a NACK if the UE does not correctly decode a TB.

[0161] In the disclosure, CSI information bits may be divided into one part or two parts. When the CSI information bits correspond to two parts, the two parts are CSI Part one and CSI Part two.

[0162] In the disclosure, the UE may transmit one or two PUCCHs within a time domain unit in a serving cell. The two PUCCHs are on different time domain resources. For example, the UE may transmit two PUCCHs on different symbols within a slot.

[0163] In the disclosure, the term "PUCCH" may be used interchangeably with the term "uplink control channel" or "channel for transmitting uplink control information" or "channel for carrying uplink control information".

[0164] In the disclosure, the UE may transmit data and / or UCI through PUSCH. The UCI being on the PUSCH may be referred to as the UCI being multiplexed; optionally, the UCI and data being transmitted together on the PUSCH may be referred to as the UCI being multiplexed.

[0165] In the disclosure, PUSCH may be used for carrying information bits. The information bits carried by the PUSCH may be referred to as information bits of the PUSCH. The information bits of the PUSCH include information bits of the TB and / or information bits of the UCI.

[0166] In the disclosure, the term "information bits of PUSCH" may be used interchangeably with the term "information bits associated with PUSCH" or "information bits carried by PUSCH". Optionally, the information bits carried by the PUSCH may include the information bits carried by the PUSCH and check bits (for example, CRC bits). Optionally, the information bits associated with the PUSCH may include the information bits of the PUSCH and bits used for checking the information carried by the PUSCH (for example, CRC bits).

[0167] In the disclosure, a PUSCH may carry one or two TBs. When the number of layers corresponding to a PUSCH is less than or equal to 4, the PUSCH carries a TB. When the number of layers corresponding to a PUSCH is greater than 4, the PUSCH carries two TBs.

[0168] In the disclosure, the reference signal associated with the uplink channel includes the reference signal for demodulation, and / or the reference signal for phase tracking. For example, the reference signal associated with the uplink channel includes the reference signal for demodulating the uplink channel, and / or the reference signal for phase tracking the uplink channel. The reference signal associated with the uplink channel may be referred to as the reference signal of the uplink channel.

[0169] In the disclosure, the uplink channel may include the uplink channel and the reference signal associated with the uplink channel.

[0170] In the disclosure, the UE may obtain indication information from the base station. The indication information from the base station may be carried / indicated via at least one of Radio Resource Control (RRC) information, Media Access Control (MAC)-Control Element (CE) (MAC-CE), DCI. The RRC information may be referred to as configuration information. The configuration information may be indicated by a RRC parameter in the RRC information. The RRC parameter may be a RRC information element. MAC-CE related indication information may be indicated via a MAC-CE parameter in MAC-CE. The MAC-CE parameter may be a parameter used for MAC-CE signaling indication / activation / deactivation.

[0171] In the disclosure, the UE may obtain one or more configurations via RRC information, and indicate / activate / deactivate a part of the one or more configurations via MAC-CE. The UE may operate according to the configuration indicated / activated by MAC-CE.

[0172] In the disclosure, the UE may obtain one or more configurations via RRC information, and indicate / activate / deactivate a part of configurations of the one or more configurations via MAC-CE. The UE may operate according to the configurations indicated / activated by MAC-CE. Optionally, the UE may determine one or more configurations of the part of the configurations (e.g., the part of the configurations indicated / activated by MAC-CE) based on indication of DCI. The UE may operate according to the configuration indicated by DCI.

[0173] In the disclosure, the RRC parameter and / or MAC-CE parameter may be referred to as the higher layer parameter.

[0174] In the disclosure, the UE obtaining the configuration information may be that the UE receiving / being configured with the configuration information. In the disclosure, "obtaining configuration information" may be used interchangeably with the term "receiving configuration information" or "being configured with configuration information".

[0175] In the disclosure, the UE may transmit indication information to the base station. The indication information transmitted to the base station may be carried / indicated via at least one of Radio Resource Control (RRC) information, Media Access Control (MAC)-Control Element (CE) (MAC-CE), and UCI.

[0176] In the disclosure, the UE may transmit information for indicating / reporting a UE capability to the base station. The UE capability includes a UE radio access capability.

[0177] In the disclosure, the term "UE capability" may be used interchangeably with the term "UE feature" or "UE feature group" or "UE capability parameter" or "reported UE capability" or "UE capability signaling" or "reported UE capability parameter".

[0178] In the disclosure, a modulation order may refer to an order of a modulated signal in digital modulation technique. The modulation order may be recorded as Qm. For example, Qm may be an integer ranged from 1 to 10. For example, Qm may be one of 2, 4, 6, 8, 10. The modulation scheme includes Phase Shift Keying with a phase difference of π / 2 (π / 2-BPSK), Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (QPSK), 8 Phase Shift Keying (8PSK), Quadrature Amplitude Modulation (16QAM), 32QAM, 64QAM, 128QAM, 256QAM, 512QAM, 1024QAM, etc. Optionally, the modulation scheme may include the modulation order. Optionally, there may be a corresponding relation between the modulation scheme and the modulation order. For example, the modulation orders of π / 2-BPSK and BPSK are 1, the modulation order of QPSK is 2, the modulation order of 8PSK is 3, the modulation order of 16QAM is 4, the modulation order of 32QAM is 5, and the modulation order of 64QAM is 6, the modulation order of 128QAM is 7, the modulation order of 256QAM is 8, the modulation order of 512QAM is 9, the modulation order of 1024QAM is 10, and so on.

[0179] In the disclosure, the term "modulation order" and the term "modulation scheme corresponding to modulation order" may be used interchangeably. For example, the indication that the UE receives the modulation order of 2 may be the indication that the UE receives QPSK.

[0180] In the disclosure, a modulation and coding scheme (MCS) table may be a table related to the modulation scheme and / or a coding scheme and / or spectral efficiency, or a table used for representing / indicating the modulation scheme and / or the coding scheme and / or the spectral efficiency. Optionally, the term "coding scheme" may be interchanged with the term "code rate". Optionally, the MCS table may include one or more entries, where each entry may correspond to at least one of the modulation scheme and / or the coding scheme and / or the spectral efficiency.

[0181] In the disclosure, the term "CSI" may be used interchangeably with the term "CSI parameter" or "CSI quantity".

[0182] 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, time-domain channel properties (TDCP). The content included in the CSI may be indicated by the base station. For example, the content included in the CSI may be configured by a higher layer parameter (e.g., reportQuantity). For example, the higher layer parameter (e.g., reportQuantity) is indicated by the CSI reporting configuration.

[0183] In the disclosure, the time resource and / or frequency resource used by the UE to report the CSI may be controlled by the base station. The UE may report the CSI through the uplink channel / uplink signal. The UE may transmit the uplink channel associated with the CSI report. The CSI may be carried / indicated through the uplink channel / uplink signal. In the disclosure, the CSI report may be at least one of the followings: periodic, semi-persistent, aperiodic. In the disclosure, the CSI report may be at least one of the followings: periodic, semi-persistent on PUCCH, semi-persistent on PUSCH, aperiodic. Optionally, the time domain behavior of the CSI report may be at least one of the followings: periodic, semi-persistent, aperiodic. The periodic CSI report may be carried by PUCCH. The semi-persistent CSI report may be carried by PUCCH or PUSCH. The aperiodic CSI report may be carried by PUSCH. The time domain behavior of the CSI report may be indicated / configured by a higher layer parameter (e.g., reportConfigType). For example, the higher layer parameter (e.g., reportConfigType) is indicated by the CSI reporting configuration. The time domain behavior of the CSI report may be the time domain behavior of the CSI report corresponding to the CSI reporting configuration. When reportConfigType is set to 'aperiodic', the corresponding CSI report is an aperiodic CSI report. When reportConfigType is set to 'semiPersistentOnPUCCH', the corresponding CSI report is a semi-persistent CSI report carried by PUCCH. When reportConfigType is set to 'semiPersistentOnPUSCH', the corresponding CSI report is a semi-persistent CSI report carried by PUSCH. When reportConfigType is set to 'periodic', the corresponding CSI report is a periodic CSI report.

[0184] In the disclosure, the periodic CSI report may be triggered / indicated by RRC signaling. For example, when the UE receives the CSI reporting configuration triggering / indicating the periodic CSI report and the configuration information is applied (or after the configuration information is applied), the UE performs the corresponding CSI report. In the disclosure, the semi-persistent CSI report may be triggered / indicated by MAC-CE or DCI. For example, the semi-persistent CSI report transmitted on PUCCH is triggered / indicated by MAC-CE. For example, the semi-persistent CSI report transmitted on PUSCH is triggered / indicated by DCI. In the disclosure, the aperiodic CSI report may be triggered / indicated by DCI. For example, when the UE receives DCI triggering / indicating the CSI report, the UE transmits the corresponding CSI report.

[0185] In the disclosure, the term "uplink channel associated with CSI report" may be used interchangeably with the term "uplink channel corresponding to CSI report" or "uplink channel carrying CSI report".

[0186] In the disclosure, the CSI may be the CSI reported by the UE in one report, or in one report instance.

[0187] In the disclosure, the generation and / or reporting of the CSI is based on the CSI reporting configuration. For example, the UE receives the CSI reporting configuration from the base station and generates and / or reports the CSI based on the CSI reporting configuration.

[0188] In the disclosure, the term "CSI reporting configuration" may be used interchangeably with the term "CSI reporting configuration information" or "information for CSI reporting configuration" or "information for configuring CSI reporting" or "CSI reporting setting".

[0189] In the disclosure, a CSI reporting band may be indicated by the CSI reporting configuration. Frequency domain granularity associated with / corresponding to the CSI may be wideband and / or subband. For example, a PMI / CQI report may be wideband and / or subband.

[0190] In the disclosure, PMI (or, the value of PMI) may correspond to a codebook (or, a codebook index). The codebook corresponding to the PMI may be indicated by the base station. For example, the codebook corresponding to the PMI is indicated by a parameter (e.g., CodebookConfig) in the CSI reporting configuration. In the disclosure, the term "codebook" may be used interchangeably with the term "CSI codebook" or "codebook configuration parameter" or "codebook configuration information" or "information for configuring the codebook". Optionally, the codebook may be at least one of the followings: Type I codebook, Type II codebook, Enhanced Type II codebook, Further Enhanced Type II Port Selection, Enhanced Type II for coherent joint transmission (CJT), Further Enhanced Type II Port Selection for CJT, Enhanced Type II for predicted PMI, Further Enhanced Type II Port Selection for predicted PMI. The configuration information related to the codebook may include / indicate a codebook subset restriction.

[0191] In the disclosure, the UE may calculate CSI parameters based on the assumption on dependencies between CSI parameters. The assumption of correlation between CSI parameters includes at least one of the followings: LI is calculated conditioned on the reported CQI, PMI, RI and CRI; CQI is calculated conditioned on the reported PMI, RI and CRI; PMI is calculated conditioned on the reported RI and CRI; RI is calculated conditioned on the reported CRI.

[0192] In the disclosure, the UE may obtain / determine / generate the CSI through measurement of the CSI resource. In the disclosure, the time resource and / or frequency resource of the CSI resource may be controlled by the base station. The CSI resource may include the reference signal and / or the downlink channel. The CSI resource may be configured by CSI resource configuration. The CSI resource configuration may indicate one or more CSI resource sets. Optionally, each CSI resource set may include / indicate one or more reference signals. Optionally, the CSI reporting configuration may be associated with one or more CSI resource configurations. For example, the UE may obtain / determine / generate the CSI corresponding to a CSI reporting configuration by measuring the CSI resource corresponding to the CSI resource configuration associated with the CSI reporting configuration.

[0193] In the disclosure, the term "CSI resource configuration" may be used interchangeably with the term "CSI resource configuration information" or "information for CSI resource configuration" or "information for configuring CSI resource" or "CSI resource setting".

[0194] In the disclosure, the UE may determine the measurement for calculating the CSI based on the CSI resource (or, occasion of the CSI resource). For example, the UE may determine channel measurement and / or interference measurement for calculating the CSI based on the CSI resource (or the occasion of the CSI resource). For example, the UE may determine channel measurement for calculating the CSI based on the CSI resource (or the occasion of the CSI resource) for channel measurement. For example, the UE may determine interference measurement for calculating the CSI based on the CSI resource (or the occasion of the CSI resource) for interference measurement.

[0195] In the disclosure, the term "transmission occasion of CSI resource" may be used interchangeably with the term "occasion of CSI resource" or "reception occasion of CSI resource" or "transmission occasion of CSI resource" or "occasion of CSI resource" or "reception occasion of CSI resource".

[0196] 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".

[0197] 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.

[0198] 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.

[0199] 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 for determining the CSI.

[0200] In the disclosure, the measurement of the CSI resource may or may not be performed with measurement restriction. The measurement restriction may be a time domain measurement restriction. The time domain measurement restriction includes the time domain restriction for channel measurement and / or the time domain restriction for interference measurement. The measurement restriction may be enabled or disabled by the CSI reporting configuration. For example, a parameter (e.g., timeRestrictionForChannelMeasurement) in the CSI reporting configuration may be used to enable the time domain restriction for channel measurement. For example, a parameter (e.g., timeRestrictionForInterferenceMeasurement) in the CSI reporting configuration may be used to enable the time domain restriction for interference measurement.

[0201] In the disclosure, the term "reference signal" may be used interchangeably with the term "reference signal resource".

[0202] In the disclosure, the reference signal may include at least one of the followings: the reference signal for synchronization, the reference signal for demodulation, the reference signal for acquiring channel states, the reference signal for phase tracking, the reference signal for mobility, the reference signal for positioning, the reference signal for channel measurement, the reference signal for interference measurement, the reference signal for sounding. Optionally, the reference signal for synchronization includes at least one of the followings: the primary synchronization signal, the secondary synchronization signal. Optionally, the reference signal for synchronization may include the synchronization signal / physical broadcast channel block. Optionally, the reference signal for demodulation may include at least one of the followings: the reference signal for data channel demodulation, the reference signal for control channel demodulation. Optionally, the data channel may include at least one of the followings: the physical downlink shared channel and the physical uplink shared channel. Optionally, the control channel may include at least one of the followings: the physical downlink control channel and the physical uplink control channel. Optionally, the reference signal for acquiring channel state may include at least one of the followings: the reference signal for tracking, the reference signal for CSI acquisition, and the reference signal for beam management. Optionally, the reference signal for beam management includes at least one of the followings: the reference signal for acquiring L1-RSRP, the reference signal for acquiring L1-SINR. Optionally, acquiring L1-RSRP may be calculating L1-RSRP. Optionally, acquiring L1-SINR may be calculating L1-SINR.

[0203] 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.

[0204] 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.

[0205] 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.

[0206] 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 to as QCL parameter type A. For example, the QCL parameter may include Doppler shift and Doppler spread, and such QCL parameter may be referred to as QCL parameter type B. For example, the QCL parameter may include Doppler shift and average delay, and such QCL parameter may be referred to as QCL parameter type C. For example, the QCL parameter may include spatial reception parameter, and such QCL parameter may be referred to 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.

[0207] In the disclosure, the term "TCI state" may be used interchangeably with the term "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.

[0208] Optionally, a TCI state may include parameters configuring quasi co-location relation, these parameters configure the relation 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 relation 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 the 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.

[0209] In the disclosure, the term "spatial domain filter" may be used interchangeably with the term "spatial filter" or "uplink transmission spatial domain filter" or "spatial domain filter for uplink transmission" or "spatial domain filter for downlink reception".

[0210] The UE receives the downlink channel. The UE receives the downlink channel based on the configuration information. Here, the downlink channel may be PDCCH and / or PDSCH. The method for the UE to receive the downlink channel based on the configuration information is as follows.

[0211] The UE may be configured with PDCCH configuration information. Optionally, the PDCCH configuration information may be information for configuring a (UE-specific) PDCCH parameter. For example, the PDCCH configuration information may be PDCCH-Config. Optionally, the UE may monitor PDCCH and / or detect DCI corresponding to the PDCCH based on the parameter in the PDCCH configuration information. Optionally, the UE may monitor the PDCCH in the search space. Optionally, the UE may detect DCI format by monitoring the PDCCH. Here, the DCI format may be carried by the PDCCH.

[0212] The UE may be configured with PDSCH configuration information. Optionally, the PDCCH configuration information may be information for configuring a PDSCH parameter. The PDSCH parameter includes a UE-specific PDSCH parameter and / or a cell-specific PDSCH parameter. For example, PDSCH-Config may be used for configuring the UE-specific PDSCH parameter. For example, PDSCH-ConfigCommon may be used for configuring the cell-specific PDSCH parameter. Optionally, the UE may receive the PDSCH based on the parameter in the PDSCH configuration information.

[0213] The UE may obtain the transmission occasion of the downlink channel through the above configuration information. The UE may determine the CSI based on the measurement of the downlink channel on the corresponding transmission occasion. In the disclosure, the downlink channel may include the reference signal associated with the downlink channel. In the disclosure, the term "downlink channel" may be used interchangeably with the term "downlink channel and / or reference signal associated with downlink channel".

[0214] In the disclosure, the term "TCI state of downlink channel" may be used interchangeably with the term "applied / indicated TCI state of downlink channel".

[0215] In the disclosure, the term "CSI of downlink channel" may be used interchangeably with the term "CSI corresponding to downlink channel" or "CSI associated with downlink channel".

[0216] In the disclosure, the UE performs measurement / reporting based on the downlink channel. The method for the UE to perform the measurement / reporting based on the downlink channel is discussed in detail below.

[0217] 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 channel state information (CSI) reporting configuration; at 402, the UE receives K downlink channels, where K is predefined or indicated by the CSI reporting configuration and K≥1; and at 403, the UE reports, based on the CSI reporting configuration, CSI determined based on measurement of reference signals associated with the K downlink channels, wherein the K downlink channels satisfy at least one of the followings: the K downlink channels have hybrid automatic repeat request acknowledgement (HARQ-ACK) information; the K downlink channels are in a first cell; the K downlink channels are within a time window; the number of frequency domain units of the K downlink channels are the same and / or the number of the frequency domain units of the K downlink channels are greater than or equal to a frequency domain threshold; transmission configuration indication (TCI) states of the K downlink channels are the same; transmission occasions corresponding to the K downlink channels are not in a time domain unit for uplink; a first time domain unit associated with the K downlink channels and a second time domain unit associated with an uplink channel carrying CSI of the K downlink channels satisfy a first time domain relation, wherein the first time domain relation includes that the second time domain unit is no earlier than the first time domain unit and / or time domain separation between the second time domain unit and the first time domain unit is greater than or equal to a time domain threshold; the K downlink channels are K semi-persistent scheduling (SPS) physical downlink shared channels (PDSCHs); the K downlink channels are dynamically scheduled PDSCHs, where the first cell is predefined or indicated by the base station, and the time window is predefined or indicated by the base station. Various operations in method 400 are described in detail below.

[0218] In some cases, the UE may receive / be configured with the CSI reporting configuration. Optionally, the CSI reporting configuration may indicate that the resource for measurement / reporting is the downlink channel and / or the reference signal associated with the downlink channel. Optionally, the CSI reporting configuration may indicate that the downlink channel received by the UE and / or the reference signal associated with the downlink channel are the resources for measurement / reporting. Optionally, the CSI reporting configuration may indicate the UE to measure / report on the downlink channel received by the UE and / or the reference signal associated with the downlink channel. Optionally, the measurement may include channel measurement and / or interference measurement.

[0219] The UE may generate and / or transmit the corresponding measurement result based on the downlink channel. Optionally, the UE generates and / or transmits the corresponding measurement result based on the measurement of the downlink channel. Optionally, the UE measures the downlink channel and generates / transmits the corresponding measurement result. Optionally, the measurement result may be based on a measurement quantity. Optionally, the measurement quantity may be at least one of the followings: power, energy, L1-RSRP, CQI. Optionally, the measurement result may be UCI. Optionally, the measurement result may be CSI. Optionally, the CSI may include L1-RSRP and / or CQI.

[0220] Optionally, the measurement result may be determined / obtained based on the downlink channel. Optionally, the measurement result may be determined / obtained based on the downlink channel and / or the reference signal associated with the downlink channel. Optionally, the measurement result may be determined / obtained based on the time-frequency resource of the downlink channel and / or the time-frequency resource of the reference signal associated with the downlink channel. Optionally, the reference signal associated with the downlink channel includes DM-RS of the downlink channel and / or PT-RS of the downlink channel.

[0221] The UE may receive one or more downlink channels. Since not all downlink channels can satisfy requirements / restrictions of measurement reporting, which features the downlink channels need to satisfy in order to obtain and / or generate and / or report measurement result are discussed below. The UE may receive the K downlink channels, K≥1. Optionally, K may be predefined, or indicated by the base station, or determined based on a UE capability. Optionally, the value of K may be a positive integer greater than or equal to 1. For example, the value of K may be indicated by the CSI reporting configuration. For example, K may be equal to the number of downlink channels within the time window. For example, K may be equal to the number of downlink channels in the first cell. Features / restrictions of the downlink channels, for example, the features / restrictions of the K downlink channels, are discussed below. The following description of the features / restrictions of the K downlink channels may apply to at least one downlink channel of the K downlink channels, or to each downlink channel of the K downlink channels, or to the last downlink channel of the K downlink channels, or to the first downlink channel of the K downlink channels. The features / restrictions of the downlink channel may include at least one of the followings.

[0222] 1) Optionally, the K downlink channels have HARQ-ACK information. Optionally, the HARQ-ACK information for the K downlink channels is generated and / or reported. Optionally, the HARQ-ACK information for the K downlink channels includes K HARQ-ACK information bits. Optionally, the K downlink channels are one-to-one corresponding to the K HARQ-ACK information bits. For example, the k-th bit of the K HARQ-ACK information bits corresponds to the k-th downlink channel of the K downlink channels. Here, 1≤k≤K. Optionally, the HARQ-ACK information for the K downlink channels corresponds to ACK. Optionally, each HARQ-ACK information bit in the HARQ-ACK information for the K downlink channels corresponds to ACK. Optionally, the UE generates and / or reports the HARQ-ACK information for the K downlink channels. The UE only reports the measurement of the downlink channels with HARQ-ACK feedback, which may facilitate the base station to restrict the measurement result of the downlink channels through the HARQ-ACK feedback information. In addition, the UE only performs measurement and reporting of the downlink channel where the HARQ-ACK feedback indicates ACK of the downlink channels with the HARQ-ACK feedback, which may prevent the UE from feeding back the measurement result of the downlink channels corresponding to NACK, reducing the reporting overhead and improving the communication system efficiency.

[0223] 2) The K downlink channels are in the first cell. Optionally, the first cell includes one or more cells. Optionally, the first cell may be indicated by the base station or predefined. For example, the first cell may be indicated by the CSI reporting configuration. For example, the first cell may be PCell or SpCell. Since channel features of different cells are different, measuring and reporting only the downlink channel in a specific cell may reflect the channel feature of the specific cell, so that the base station may use the corresponding scheduling method for the specific cell, improving the scheduling efficiency of the specific cell, thereby improving the efficiency of the communication system.

[0224] 3) The K downlink channels are within the time window. Optionally, the time domain position of the time window may be indicated by the base station. The time domain position of the time window may include the starting position / ending position of the time window and / or the length of the time window. Optionally, the starting position / ending position of the time window is determined based on the time domain position of the uplink channel (for) carrying the CSI. For example, the separation between the starting position / ending position of the time window and the time domain position of the uplink channel carrying the CSI is indicated by the base station. For example, the offset between the starting time domain unit / ending time domain unit of the time window and the starting time domain unit / ending time domain unit of the uplink channel carrying the CSI is indicated by the base station. For example, the value of the offset indicated by the base station is Yoffset, the starting time domain unit of the uplink channel carrying the CSI is time domain unit n, then the ending time domain unit of the time window is n-Yoffset, or n+Yoffset. Since the channel has time-varying characteristics, adding the time window to the measurement of the downlink channel may enable the UE to measure / process the downlink channel within a specific time domain range to accurately reflect the channel features within a specific time.

[0225] 4) The number of the frequency domain units of the K downlink channels are the same, and / or the number of the scheduled / indicated frequency domain units of the K downlink channels are greater than or equal to the frequency domain threshold. In the disclosure, the frequency domain unit of the downlink channel may be the scheduled / indicated frequency domain unit of the DL channel. Optionally, the number of the frequency domain units of at least one (or each) downlink channel of the K downlink channels is greater than or equal to the frequency domain threshold. Optionally, the frequency domain threshold may be predefined, or indicated by the base station, or determined based on the UE capability, or determined based on the size of the BWP receiving the downlink channel. Here, the BWP may be the activated BWP. Optionally, the frequency domain threshold may be based on / equal to at least one of the followings: a first threshold; the size of the BWP; the larger / smaller value of the size of the BWP and the first threshold. For example, the first threshold may correspond to 12, 24, 36, 48 frequency domain units. For example, the first threshold is determined based on the size of the BWP receiving the downlink channel. For example, the first threshold is determined based on the size of the BWP receiving the K downlink channels. For example, the first threshold is equal to NBWP * S, or equal to the round up of NBWP * S, where NBWP represents the size of BWP and S is a scaling coefficient. Optionally, S≤1. Optionally, S≥0. Optionally, the value of S may be one of 1, 0.5, 0.25, 0.1. When S is 0.5, the frequency domain threshold is half the size of the BWP. Since the measurement accuracy of the UE is related to the bandwidth of the measurement resource, for example, when the bandwidth is large, the measurement accuracy of the UE is relatively high; when the bandwidth is small, the measurement accuracy of the UE is relatively low. Therefore, the above method may allow the measurement bandwidth of the downlink channel the same so that it corresponds to the same accuracy, thereby facilitating the base station to compare different measurement results. In addition, the above method may prevent the measurement bandwidth of the downlink channel from being less than a threshold, so that the minimum accuracy of the measurement based on the downlink channel can be guaranteed, thereby improving the reliability of the communication system.

[0226] 5) the K downlink channels have the same beams. For example, the (directions of ) beams used by (the transmission / reception of) the K downlink channels are same beam, or the K downlink channels correspond to the same TCI states, or the K downlink channels correspond to the same QCL parameters, or the K downlink channels correspond to the same QCL assumptions. Since the features of the channel in different directions are different, measuring and reporting only the downlink channel in a specific direction may reflect the channel feature in that direction, so that the base station can use the corresponding scheduling method for the specific direction, improving the scheduling efficiency in the specific direction, thereby improving the efficiency of the communication system.

[0227] 6) The transmission occasions corresponding to the K downlink channels are not in the uplink time domain unit. Optionally, the uplink time domain unit may be configured by higher layer signaling. For example, the uplink time domain unit is configured as uplink via higher layer signaling. Since the UE cannot successfully receive the downlink channel in the uplink time domain unit, this method may prevent the UE from measuring and / or reporting the occasion of the downlink channel in the uplink time domain unit, reducing the reporting overhead and improving the efficiency of the communication system.

[0228] 7) The first time domain unit associated with the K downlink channels (or, the reference signals associated with the downlink channels) and the second time domain unit associated with the uplink channel carrying the CSI of the K downlink channels (or, the reference signals associated with the downlink channels) satisfy a specific time domain relation. The specific time domain relation includes at least one of the followings: the second time domain unit is no earlier than the first time domain unit (or the first time domain unit is no later than the second time domain unit); the time domain separation between the second time domain unit and the first time domain unit is greater than or equal to the time domain threshold.

[0229] 8) the K downlink channels are SPS PDSCHs. Optionally, the K downlink channels correspond to the same SPS configuration information. Optionally, the K downlink channels correspond to first SPS configuration information. Optionally, the first cell includes one or more SPS configuration information. Optionally, the first SPS configuration information may be indicated by the base station or predefined. For example, the first SPS configuration information may be indicated by the CSI reporting configuration. For example, the configuration ID of the first SPS configuration information is indicated by the base station or predefined. Since SPS PDSCH usually corresponds to semi-persistent service, only measuring and reporting SPS PDSCH may reflect the channel features for semi-persistent service scheduling, so that the base station can use the corresponding scheduling method for the semi-persistent service, improving the scheduling efficiency of the semi-persistent service, thereby improving the efficiency of the communication system.

[0230] 9) the K downlink channels are dynamically scheduled PDSCHs. Optionally, the K downlink channels correspond to DCI or correspond to PDCCHs. Optionally, the DCI may be scrambled by a specific RNTI. The specific RNTI may be predefined or indicated by the base station. For example, the specific RNTI may be C-RNTI or CS-RNTI. Since dynamically scheduled PDSCH usually corresponds to aperiodic service, measuring and reporting only dynamically scheduled PDSCH may reflect the channel features for aperiodic service scheduling, so that the base station can use the corresponding scheduling method for the aperiodic service, improving the scheduling efficiency of the aperiodic service, thereby improving the efficiency of the communication system.

[0231] Definitions of the first time domain unit and the second time domain unit are discussed below.

[0232] Optionally, the first time domain unit is determined based on the time domain position of the downlink channel (or the reference signal associated with the downlink channel). Optionally, the first time domain unit is determined based on the last time domain unit where the downlink channel (or the reference signal associated with the downlink channel) is located. Optionally, the first time domain unit may be the last time domain unit where the downlink channel (or the reference signal associated with the downlink channel) is located. Optionally, the first time domain unit is an uplink time domain unit. Optionally, the first time domain unit is after the last time domain unit where the downlink channel (or the reference signal associated with the downlink channel) is located. Optionally, the first time domain unit is after a first time point. Optionally, the first time point is after the time domain threshold from the end of the last time domain unit where the downlink channel (or the reference signal associated with the downlink channel) is located. Optionally, the second time domain unit is determined based on the earliest time domain unit where the uplink channel is located. Optionally, the second time domain unit is the earliest time domain unit where the uplink channel is located. Optionally, the time domain position of the second time domain unit takes the effect of timing advance into account. Optionally, the second time domain unit includes the effect of timing advance.

[0233] Optionally, the time domain threshold may be determined based on the content included in the CSI. Optionally, for example, when the CSI is L1-RSRP, the time domain threshold is a first value. For example, when the CSI is CQI, the time domain threshold is a second value. Optionally, the second value is greater than or equal to the first value. Since the complexity of calculation of CQI is higher than that of L1-RSRP, the second value being greater than or equal to the first value may provide the UE with more time to generate the CSI, reducing the hardware complexity of the UE. Optionally, the time domain threshold may be determined based on the UE capability. Optionally, the time domain threshold may be indicated by the base station. Optionally, the second time domain unit is determined based on the time domain position of the uplink channel. Optionally, the time domain threshold may be predefined.

[0234] The triggering / reporting methods of the HARQ-ACK information for the K downlink channels and / or the CSI of the K downlink channels are discussed below.

[0235] Optionally, the HARQ-ACK information for the K downlink channels and the CSI associated with the K downlink channels may be jointly triggered and / or jointly reported.

[0236] Optionally, the HARQ-ACK information for the K downlink channels and the CSI associated with the K downlink channels may be triggered by the same indication information from the base station. For example, the HARQ-ACK information for the K downlink channels and the CSI associated with the K downlink channels may be triggered by DCI. This method allows the HARQ-ACK information and the CSI of the K downlink channels to be jointly triggered, saving the overhead of triggering signaling and improving the efficiency of the communication system.

[0237] Optionally, the HARQ-ACK information for the K downlink channels and the CSI associated with the K downlink channels may be reported on the same uplink channel. Optionally, the resource corresponding to the uplink channel may be indicated by the HARQ-ACK information for triggering the K downlink channels and the indication information for the CSI associated with the K downlink channels. This method allows the HARQ-ACK information and the CSI of the K downlink channels to be jointly reported, saving the reporting overhead and improving the efficiency of the communication system.

[0238] For the measurement of the downlink channel, the UE may report or not report the corresponding CSI. For example, the UE may or may not report the CSI corresponding to at least one downlink channel of the K downlink channels. For example, when the features / restrictions of a downlink channel (for example, a downlink channel of the K downlink channels) are satisfied, the UE reports the CSI of the downlink channel. For example, when the features / restrictions of a downlink channel (for example, a downlink channel of the K downlink channels) are not satisfied, the UE does not report the CSI of the downlink channel. For example, when the features / restrictions of a downlink channel of the K downlink channels (for example, at least one downlink channel of the K downlink channels) are satisfied, the UE reports the CSI of the K downlink channels. For example, when the features / restrictions of all downlink channels of the K downlink channels (for example, any downlink channel of the K downlink channels) are satisfied, the UE reports the CSI of the K downlink channels. For example, when the features / restrictions of a downlink channel of the K downlink channels (for example, at least one downlink channel of the K downlink channels) are not satisfied, the UE does not report the CSI of the K downlink channels. For example, when the features / restrictions of all downlink channels of the K downlink channels (for example, any downlink channel of the K downlink channels) are not satisfied, the UE does not report the CSI of the K downlink channels. The above method may allow the UE to only report the CSI of the downlink channel satisfying the features / restrictions, saving the overhead of CSI reporting.

[0239] In order to prevent the payload of the CSI report from changing with whether the downlink channel satisfying the corresponding features / restrictions and reduce the complexity of generating the CSI, the UE may (always) report the CSI of the downlink channel (for example, report the CSI of the K downlink channels). For the measurement of the downlink channel, the UE may update or not update the corresponding CSI. Optionally, the generation of the updated CSI requires calculation by the UE. Optionally, the generation of the CSI that is not updated does not require calculation by the UE. In the case where the features / restrictions of the downlink channel are satisfied, the UE updates the CSI by calculation. In the case where the features / restrictions of the downlink channel are not satisfied, the UE may directly generate / report the CSI (or, not update the CSI) without calculation. This allows the UE to only update / calculate the CSI of the downlink channel satisfying related features / restrictions, reducing the update / calculation of the CSI and saving the power consumption of the UE. In the disclosure, the updated CSI may refer to / may be considered as valid CSI, or the updated CSI report. In the disclosure, the CSI that is not updated may refer to / may be considered as invalid CSI, or the CSI report that is not updated. In the disclosure, not update may mean not required to update, or not expected to update. In the disclosure, update may mean required to update, or expected to update. Optionally, the UE may determine whether to update the corresponding CSI according to whether the features / restrictions of the downlink channel are satisfied. For example, the UE may update or not update the CSI corresponding to at least one downlink channel of the K downlink channels. For example, when the features / restrictions of a downlink channel (for example, a downlink channel of the K downlink channels) are satisfied, the UE updates the CSI of the downlink channel. For example, when the features / restrictions of a downlink channel (for example, a downlink channel of the K downlink channels) are not satisfied, the UE does not update the CSI of the downlink channel. For example, when the features / restrictions of a downlink channel of the K downlink channels (for example, at least one downlink channel of the K downlink channels) are satisfied, the UE updates the CSI of the K downlink channels. For example, when the features / restrictions of all downlink channels of the K downlink channels (for example, any downlink channel of the K downlink channels) are satisfied, the UE updates the CSI of the K downlink channels. For example, when the features / restrictions of a downlink channel of the K downlink channels (for example, at least one downlink channel of the K downlink channels) are not satisfied, the UE does not update the CSI of the K downlink channels. For example, when the features / restrictions of all downlink channels of the K downlink channels (for example, any one downlink channel of the K downlink channels) are not satisfied, the UE does not update the CSI of the K downlink channels.

[0240] Optionally, the UE may determine whether to update the CSI of the downlink channel based on at least one of the followings: 1) the HARQ-ACK information for the downlink channel (e.g., at least one downlink channel of the K downlink channels); 2) the number of the frequency domain units of a downlink channel (e.g., at least one downlink channel of the K downlink channels); 3) the time domain position of the reference signal associated with the downlink channel (for example, at least one downlink channel of the K downlink channels) and the time domain position of the uplink channel carrying the CSI of the downlink channel; 4) the time domain separation between the time domain position of the downlink channel (e.g., at least one downlink channel of the K downlink channels) and the uplink channel carrying the CSI; 5) whether the K downlink channels are SPS PDSCHs, or whether the K downlink channels correspond to the first SPS configuration information; 6) whether the K downlink channels are dynamically scheduled PDSCHs.

[0241] Optionally, when the HARQ-ACK information for the downlink channel corresponds to ACK, the UE updates the CSI of the downlink channel. Optionally, when the HARQ-ACK information for the downlink channel corresponds to NACK, the UE does not update the CSI of the downlink channel. The HARQ-ACK information for the downlink channel corresponding to ACK means that at least one TB carried by the downlink channel corresponds to ACK, or all TBs carried by the downlink channel correspond to ACK. For example, when the downlink channel carries two TBs, the HARQ-ACK information for the downlink channel corresponding to ACK means that one of the HARQ-ACK information bits of the two TBs corresponds to ACK, or the HARQ-ACK information bits of the two TBs correspond to ACK. This method allows the UE to update the CSI only for the downlink channel of the successfully decoded TB, avoiding the generation of the CSI for the downlink channel of the TB that fails to be decoded, reducing the complexity of the UE in processing the CSI and improving the efficiency of the communication system.

[0242] Optionally, when the number of the frequency domain units of the downlink channel is greater than or equal to the frequency domain threshold, the UE updates the CSI of the downlink channel. Optionally, when the number of the frequency domain units of the downlink channel is less than or equal to the frequency domain threshold, the UE does not update (or the UE is not required to update, or the UE is not expected to update) the CSI of the downlink channel. This method allows the UE to update the CSI only for the downlink channel exceeding a specific bandwidth, avoiding the generation of the CSI for the downlink channel with small scheduling bandwidth, reducing the complexity of the UE in processing the CSI and improving the efficiency of the communication system.

[0243] Optionally, the UE determines whether to update the CSI of the downlink channel based on the first time domain unit associated with the downlink channel (or, the reference signal associated with the downlink channel) and the second time domain unit of the uplink channel carrying the CSI of the downlink channel (or, the reference signal associated with the downlink channel). Optionally, when the second time domain unit is no earlier than the first time domain unit, the UE updates the CSI of the downlink channel. Optionally, when the second time domain unit is earlier than the first time domain unit, the UE does not update (or the UE is not required to update, or the UE is not expected to update) the CSI of the downlink channel. Optionally, when the time domain separation between the second time domain unit and the first time domain unit is greater than or equal to the time domain threshold, the UE updates the CSI of the downlink channel. Optionally, when the time domain separation between the second time domain unit and the first time domain unit is less than or equal to the time domain threshold, the UE does not update (or the UE is not required to update, or the UE is not expected to update) the downlink CSI of the channel. In the disclosure, the time domain separation may be the offset of the time domain unit, or the time domain distance.

[0244] Optionally, the HARQ-ACK information for the K downlink channels and the CSI associated with the K downlink channels may be triggered separately and / or reported separately.

[0245] Optionally, the reporting of the CSI associated with the downlink channel may be triggered by the indication from the base station. Optionally, the CSI associated with the downlink channel may be transmitted through an aperiodic CSI report, a semi-persistent CSI report, or a periodic CSI report.

[0246] Optionally, the indication information (for example, at least one of RRC, MAC-CE, and DCI) triggering the CSI associated with the K downlink channels is after the K downlink channels. Optionally, the indication information (for example, at least one of RRC, MAC-CE, and DCI) triggering the CSI associated with the K downlink channels is before the uplink channel carrying the HARQ-ACK information for the K downlink channels.

[0247] Optionally, the UE receives the indication information (e.g., at least one of RRC, MAC-CE, DCI). Optionally, the indication information indicates / triggers the CSI report based on the downlink channel. Optionally, the indication information indicates / triggers an aperiodic CSI report based on the downlink channel. Optionally, the UE detects DCI. Optionally, the DCI triggers / indicates the CSI report. Optionally, the UE receives MAC-CE or RRC, where the MAC-CE or RRC triggers / indicates the CSI report. Optionally, the CSI report is an aperiodic CSI report. Optionally, the CSI report includes the CSI of the K downlink channels. Optionally, the K downlink channels are determined as follows.

[0248] Optionally, the K downlink channels refer to the latest K downlink channels before the indication information. Optionally, the K downlink channels refer to the K downlink channels in the first cell. Optionally, the K downlink channels refer to the K downlink channels with the HARQ-ACK information. Optionally, the K downlink channels refer to the K downlink channels for which the HARQ-ACK information is generated. Optionally, the K downlink channels refer to the K downlink channels with the corresponding HARQ-ACK information being ACK. Optionally, the K downlink channels refer to the K downlink channels for which the HARQ-ACK information is reported. Optionally, the K downlink channels refer to the K downlink channels for which the HARQ-ACK information is reported before the indication information. Optionally, the K downlink channels refer to the K downlink channels of which the number of the scheduled frequency domain units is greater than or equal to the frequency domain threshold. Optionally, the K downlink channels refer to the K PDSCHs. Optionally, the K downlink channels refer to the K downlink channels of which the TCI states are the same as the indicated TCI state. Optionally, the indicated TCI state may be the indicated joint TCI state. Optionally, the K downlink channels refer to the K downlink channels in the time window. In the disclosure, before the indication information may be before the channel carrying the indication information.

[0249] Optionally, the K downlink channels satisfy at least one of the following conditions: 1) the K downlink channels are the latest K downlink channels before the indication information; 2) the K downlink channels are in the first cell; 3) the HARQ-ACK information for the K downlink channels is generated; 3) the HARQ-ACK information for the K downlink channels is ACK; 4) the HARQ-ACK information for the K downlink channels is reported; 5) the HARQ-ACK information for the K downlink channels is reported before the indication information; 5) the number of the frequency domain units of the K downlink channels is greater than or equal to the frequency domain threshold; 6) the K downlink channels refer to the K PDSCHs; 7) the applied TCI states of the K downlink channels are the same as the indicated TCI states; 8) the K downlink channels are in the time window; 9) the K downlink channels are SPS PDSCHs, or the K downlink channels correspond to the first SPS configuration information; 10) the K downlink channels are the dynamically scheduled PDSCHs.

[0250] The above method allows the UE to determine the downlink channel for measuring / reporting the CSI in a predefined manner, saving signaling overhead and improving the efficiency of the communication system.

[0251] Optionally, the UE receives the indication information (e.g., at least one of RRC, MAC-CE). Optionally, the indication information indicates / triggers / activates the CSI report based on the downlink channel. Optionally, the CSI report is a periodic CSI report or a semi-persistent CSI report. Optionally, the CSI report includes the CSI of the K downlink channels. Optionally, the K downlink channels are determined as follows.

[0252] Optionally, the K downlink channels refer to the K downlink channels between the first CSI report and the latest CSI report before the first CSI report. Here, the first CSI report refers to the report for carrying the CSI associated with the downlink signal. Optionally, the first CSI report is associated with / corresponds to the same CSI reporting configuration as the latest CSI report before the first CSI report. Optionally, the latest CSI report before the first CSI report is determined / generated based on the CSI reporting configuration. Optionally, the K downlink channels refer to the K downlink channels in the first cell. Optionally, the K downlink channels refer to the K downlink channels for which the HARQ-ACK information is generated. Optionally, the K downlink channels refer to the K downlink channels with the corresponding HARQ-ACK information being ACK. Optionally, the K downlink channels refer to the K downlink channels for which the HARQ-ACK information is reported. Optionally, the K downlink channels refer to the K downlink channels for which the HARQ-ACK information is reported before the indication information. Optionally, the K downlink channels refer to the K downlink channels of which the number of the scheduled frequency domain units is greater than or equal to the frequency domain threshold. Optionally, the K downlink channels refer to the K PDSCHs. Optionally, the K downlink channels refer to the K SPS PDSCHs. Optionally, the K downlink channels refer to the K dynamically scheduled PDSCHs. Optionally, the K downlink channels refer to the K downlink channels of which the applied TCI states are the same as the indicated TCI state. Optionally, the indicated TCI state may be the indicated joint TCI state. Optionally, the K downlink channels refer to the K downlink channels in the time window. In the disclosure, before the indication information may be before the channel carrying the indication information.

[0253] Optionally, the K downlink channels satisfy at least one of the following conditions: 1) the K downlink channels are between the first CSI report and the latest CSI report before the first CSI report; 2) the K downlink channels are in the first cell; 3) the HARQ-ACK information for the K downlink channels is generated; 4) the HARQ-ACK information for the K downlink channels is ACK; 4) the HARQ-ACK information for the K downlink channels is reported; 5) the HARQ-ACK information for the K downlink channels is reported before the indication information; 5) the number of the frequency domain units of the K downlink channels is greater than or equal to the frequency domain threshold; 6) the K downlink channels refer to the K PDSCHs; 7) the K downlink channels refer to the K SPS PDSCHs, or the K downlink channels correspond to the first SPS configuration information; 8) the applied TCI states of the K downlink channels are the same as the indicated TCI states; 9) the K downlink channels are in the time window; 10) the K downlink channels are K dynamically scheduled PDSCHs.

[0254] The above method allows the UE to determine the downlink channel for measuring / reporting the CSI in a predefined manner, saving signaling overhead and improving the efficiency of the communication system.

[0255] The mapping / determination method of the K downlink channels and associated CSI is discussed below.

[0256] Optionally, the UE may or may not report the CSI determined based on the measurement of the K downlink channels (or the reference signals associated with the K downlink channels).

[0257] Optionally, the CSI is determined based on the downlink channel (or the reference signal associated with the downlink channel) corresponding to the first / last information bit in the HARQ-ACK information for the K downlink channels. Optionally, the first / last information bit is determined based on the mapping order of the HARQ-ACK information in UCI.

[0258] Optionally, the CSI is determined based on the first / last downlink channel (or the reference signal associated with the downlink channel) of the K downlink channels. The first / last downlink channel is determined based on the order of the K downlink channels in time domain. For example, the first / last downlink channel is determined based on the starting / ending time domain unit of the downlink channel. For example, if there are two downlink channels, PDSCH#1 and PDSCH#2, where the ending symbol of PDSCH#1 is earlier and the ending symbol of PDSCH#2 is later, then PDSCH#1 is the first downlink channel, and PDSCH#2 is the last downlink channel. Optionally, if the starting / ending time domain units of one or more downlink channels are the same, the downlink channel with the smaller / larger value of cell ID is ordered earlier. Optionally, the cell corresponding to the downlink channel may be the cell receiving the downlink channel.

[0259] Optionally, the CSI is determined based on the downlink channel (or the reference signal associated with the downlink channel) with the latest / earliest triggering DCI of the K downlink channels. Optionally, the order of DCI may be determined based on the order of the downlink channels carrying DCI. Optionally, the latest / earliest DCI is determined based on the order of DCI in time domain. For example, the latest / earliest DCI is determined based on the starting / ending time domain unit of the downlink channel carrying the DCI. For example, if two downlink channels are triggered / scheduled by two DCI, where the two DCI are in two PDCCHs (PDCCH#1 and PDCCH#2), where the ending symbol of PDCCH#1 is earlier and the ending symbol of PDCCH#2 is later, the downlink channel triggered / indicated by PDCCH#1 is the first downlink channel, and the downlink channel triggered / indicated by PDCCH#2 is the last downlink channel. Optionally, if the starting / ending time domain units of one or more DCI triggering / indicating downlink channels are the same, the downlink channel with the smaller / larger value of cell ID is ordered earlier. Optionally, the cell corresponding to the downlink channel may be the cell receiving the downlink channel.

[0260] Optionally, the CSI is determined based on the K downlink channels. Optionally, the CSI is determined based on each downlink channel of the K downlink channels. Optionally, the CSI is determined based on the average of the measurement results of the K downlink channels (or the reference signals associated with the downlink channels).

[0261] Optionally, the CSI may include one CSI corresponding to the K downlink channels, or K CSI corresponding to the K downlink channels. Optionally, when the K downlink channels correspond to one CSI, the CSI is determined based on the assumption that the EPRE of the K downlink channels (or the reference signals associated with the downlink channels) is the same. Optionally, the UE assumes that the EPRE of the K downlink channels (or the reference signals associated with the downlink channels) is the same. Optionally, when the K downlink channels correspond to K CSI, the k-th CSI of the K CSI corresponds to the k-th downlink channel of the K downlink channels. Optionally, 1≤k≤K. Optionally, refer above for the method of determining the order of the K downlink channels.

[0262] The above method specifies the mapping relation between the CSI and the downlink channels in a predefined manner, saving signaling overhead and improving the efficiency of the communication system.

[0263] The method of performing differential L1-RSRP reporting when CSI is L1-RSRP is discussed below.

[0264] If the number of the CSI corresponding to the K downlink channels is greater than 1, the UE may perform reporting based on differential L1-RSRP. Optionally, if the K downlink channels correspond to K CSI, and K>1, the UE may perform reporting based on differential L1-RSRP. Optionally, the K L1-RSRP may be divided into one first L1-RSRP and K-1 differential L1-RSRPs. Optionally, the first L1-RSRP is determined based on one downlink channel of the K downlink channels. Optionally, the downlink channel may be the first / last downlink channel of the K downlink channels. Optionally, the downlink channel may be the downlink channel with the highest / lowest L1-RSRP of the K downlink channels. Here, L1-RSRP refers to the measured L1-RSRP. Optionally, the downlink channel may be the downlink channel with the highest / lowest measured L1-RSRP of the K downlink channels. Optionally, the K-1 differential L1-RSRPs are determined / calculated based on the first L1-RSRP. Optionally, the value of the first L1-RSRP is obtained by quantization based on the corresponding measurement quantity. The number of quantized bits corresponding to the first L1-RSRP may be 7. The value of one / each L1-RSRP of the K-1 differential L1-RSRPs are obtained by quantization based on the difference between the corresponding measurement quantity and the measurement quantity corresponding to the first L1-RSRP. The number of quantized bits corresponding to the differential L1-RSRP may be 4.

[0265] In the case of differential L1-RSRP reporting, in order to clarify whether the L1-RSRP corresponding to different downlink channels is differential or non-differential, the base station needs to know the downlink channel with the highest / lowest L1-RSRP is which one of the K downlink channels to correctly interpret the CSI reported by the UE. Therefore, the UE needs to indicate which downlink channel of the K downlink channels corresponds to the highest / lowest measured L1-RSRP. Optionally, a first indicator is included in the CSI, where the first indicator indicates the downlink channel with the highest / lowest measurement quantity (for example, L1-RSRP, or measured L1-RSRP) of the K downlink channels. Optionally, the value of the first indicator is p, p≥0 or p≥1. Optionally, p≤K-1, or p≤K. Optionally, p corresponds to the (p+1)-th downlink channel of the K downlink channels. Optionally, p corresponds to the p-th downlink channel of the K downlink channels. Optionally, the size of the field (e.g., CSI field) corresponding to the first indicator is determined based on K, for example, or . Optionally, the information bits corresponding to the first indicator are before the information bits corresponding to K L1-RSRP.

[0266] The above method provides the reporting method for the differential L1-RSRP. Since the number of bits corresponding to the differential L1-RSRP may be less than the number of bits corresponding to non-differential L1-RSRP, the reporting method for the differential L1-RSRP may save signaling overhead, improving the efficiency of the communication system.

[0267] Optionally, the UE may or may not report the CSI determined based on the measurement of the K downlink channels (or the reference signals associated with the K downlink channels). The UE may determine whether to report the CSI associated with the K downlink channels based on the indication from the base station. Optionally, the UE may determine whether to report the CSI associated with the K downlink channels based on the indication of the CSI reporting configuration. Optionally, the UE may determine whether to report the CSI associated with the K downlink channels based on the indication of DCI. Optionally, the DCI triggers the HARQ-ACK information associated with the K downlink channels. Optionally, the DCI indicates the resource of the uplink channel carrying the CSI associated with the K downlink channels and the HARQ-ACK information associated with the K downlink channels. Optionally, a field in the DCI is used for indicating whether to report the CSI associated with the K downlink channels. Optionally, the size of the field is 1 bit. When the value of the field is a first value (for example, 0), the UE reports the CSI associated with the K downlink channels. When the value of the field is a second value (for example, 1), the UE does not report the CSI associated with the K downlink channels.

[0268] The above method provides the method of enabling / disabling the reporting of the CSI of the downlink channel, improving the flexibility of the communication system.

[0269] The following description of the downlink channel may apply to at least one channel of the K downlink channels. For example, the following description of the downlink channel may apply to the first downlink channel or the last downlink channel of the K downlink channels. For example, the following description of the downlink channel may apply to each downlink channel of the K downlink channels. For example, the following description of the downlink channel may apply to the downlink channel for CSI determination / CSI calculation of the K downlink channels. For example, the following description of the downlink channel may apply to each downlink channel for CSI determination / CSI calculation of the K downlink channels.

[0270] Optionally, a downlink channel may have (or be indicated with) P (P≥1) ports. Optionally, the reference signal associated with a downlink channel may have (or be indicated with) P (P≥1) ports. The measurement result may be determined / obtained based on the P ports (for example, the measurement of the P ports, or the measurement quantities of the P ports). Optionally, the measurement result may be determined / obtained based on the average (e.g., linear average) of the P ports (e.g., the measurement of the P ports, or the measurement quantities of the P ports). Optionally, the measurement result may be determined / obtained based on the summation of the P ports (for example, the measurement of the P ports, or the measurement quantities of the P ports). The above method provides the calculation method for the measurement result in the case of one or more ports, preventing the UE from reporting the CSI for each port and reducing the overhead of the CSI reporting.

[0271] In some cases, if the k-th (1≤k≤K) downlink channel of the K downlink channels (or the reference signal associated with the k-th downlink channel) is used for determining the CSI, the CSI is determined based on the measurement quantity of the port(s) associated with a first TCI state of the ports of the reference signal associated with the k-th downlink channel. Optionally, the port associated with the first TCI state may be all ports associated with the first TCI state. The description related to the first TCI state is as follows.

[0272] Optionally, the downlink channel may correspond to one or more beams (e.g., TCI states). For example, the downlink channel corresponds to Y TCI states. Optionally, Y≥1. There is a mapping relation between the P ports and the Y TCI states of the downlink channel. Optionally, the mapping relation may be predefined or indicated by the base station. Optionally, PTCIports of the P ports are mapped with the first TCI state of the Y TCI states. Optionally, PTCI≤P, and / or, PTCI≥1. For example, the mapping of the PTCIports of the P ports and the first TCI state of the Y TCI states means that the PTCIports of the P ports are quasi-co-located with the antenna port of the reference signal indicated by the first TCI state of the Y TCI states. Optionally, the measurement result of the downlink channel may be determined / obtained based on the port(s) associated with / corresponding to the first TCI state (for example, the measurement of the PTCIports, or the measurement quantities of the PTCIports). Optionally, the measurement result of the downlink channel may be determined / obtained based on the average (for example, linear average) of the port(s) associated with / corresponding to the first TCI state (for example, the measurement of the PTCIports, or the measurement quantities of the PTCIports). Optionally, the measurement result of the downlink channel may be determined / obtained based on the summation of the port(s) associated with / corresponding to the first TCI state (for example, the measurement of the PTCIports, or the measurement quantities of the PTCIports). Optionally, the TCI state (for example, the first TCI state) used for determining the measurement result of the downlink channel may be predefined or indicated by the base station. For example, the first TCI state may be a predefined TCI state of the Y TCI states. For example, the predefined TCI state is the earliest TCI state of the Y TCI states, or the last TCI state. For example, the first TCI state may be one of the Y TCI states indicated by the CSI reporting configuration.

[0273] For example, a PDSCH has P ports (Port#1, Port#2, Port#3, and Port#4), and the PDSCH corresponds to two TCI states (TCI state#1 and TCI state#2). Port#1 and Port#2 correspond to TCI state#1; Port#3 and Port#4 correspond to TCI state#2. The measurement result of the PDSCH may be the measurement result of Port#1 and Port#2 associated with TCI state#1.

[0274] Optionally, the measurement result may be determined based on the assumption of EPRE. Optionally, the assumption of EPRE refers to the assumption that the offset / difference between the EPRE of the downlink channel for CSI calculation / CSI determination and the measured (or received) EPRE of the downlink channel is equal to a specific value. Optionally, the specific value may be predefined. Optionally, the specific value is indicated by the base station (e.g., by the CSI reporting configuration). Optionally, the EPRE of the downlink channel may be the EPRE of the reference signal associated with the downlink channel. Here, the EPRE of the downlink channel for CSI calculation may be denoted as PDL,CSI; the measured (or received) EPRE of the downlink channel may be denoted as PDL,m; the offset / difference between EPRE may be denoted as PDiff. The value of PDiffmay be predefined, or the value of PDiffmay be indicated by the base station. For example, the value of PDiffmay be indicated by the field in DCI scheduling / indicating / triggering the downlink channel. Optionally, PDiff= PDL,CSI- PDL,m, or PDiff= PDL,m- PDL,CSI. Optionally, the unit of PDiffmay correspond to decibel (dB). PDL,CSIand PDL,mmay be dBm. The value of PDiffmay be an integer. For example, the value of PDiffmay be an integer ranged from -15 and 8. Optionally, PDiff= PDL,CSI / PDL,m, or PDiff= PDL,m / PDL,CSI. Optionally, the value of PDiffmay be one of 1 / 16, 1 / 8, 1 / 4, 1 / 2, 1, 2, 4, 8, 16. The above method allows the UE to use a value different from the measured EPRE of the downlink channel for CSI calculation, improving the flexibility of the CSI reporting.

[0275] Optionally, the RSRP of the downlink channel (or, the L1-RSRP of the downlink channel) may be determined based on the power over the P ports. For example, the RSRP of the downlink channel (or, the L1-RSRP of the downlink channel) may be defined as the summation of the values of P antenna ports (or, the average of the values of the P antenna ports), where each value of the antenna port refers to the linear average over the power of the resource elements of the antenna port(s) that carry reference signals associated with DL channel. For example, the RSRP of the downlink channel (or, the L1-RSRP of the downlink channel) may be defined as the summation of the values of the P antenna ports (or, the average of the values of the P antenna ports), where each value of the antenna port refers to the linear average over the power of the resource elements of the antenna port(s) that carry DL channel. The power may be referred to as power contribution. The unit of power may be Watt (W). Optionally, the power per resource element is determined from the energy received during the part of the symbol excluding the CP. In the disclosure, the description of the P ports also applies to the description of the PTCIports.

[0276] Optionally, the CQI of the downlink channel may be determined by the following method. Optionally, if the downlink channel carries a TB, the CQI corresponding to the downlink channel is determined based on the TB. Optionally, if the downlink channel carries two TBs, the CQIs corresponding to the two TBs are determined separately. Optionally, for a TB carried by the downlink channel, the corresponding CQI may be determined by the following method. Optionally, the CQI may be determined based on at least one of the followings associated with the downlink channel: a reference resource, a reference signal, a modulation scheme, a code rate, a TB size, a spatial domain parameter, a redundancy version (RV).

[0277] Optionally, the reference resource may be referred to as a CSI reference resource. Optionally, the reference resource associated with the downlink channel may be the resource of the measured / received downlink channel (for example, the physical resource of the downlink channel), or the resource indicated by the base station. Optionally, the reference resource associated with the downlink channel may be the resource occupied by the downlink channel. Optionally, the reference resource associated with the downlink channel refers to the physical resource corresponding to the downlink channel indicated by the base station. Optionally, the subcarrier spacing (SCS) corresponding to the reference resource associated with the downlink channel may be predefined. Optionally, the SCS corresponding to the reference resource associated with the downlink channel may be 30kHz or 120kHz. For example, in frequency range 1 (FR1), the SCS corresponding to the reference resource associated with the downlink channel may be 15kHz or 30kHz. For example, in frequency range 2 (FR2), the SCS corresponding to the reference resource associated with the downlink channel may be 60kHz or 120kHz. Optionally, the SCS corresponding to the reference resource associated with the downlink channel may be determined based on the SCS for receiving downlink channel(s). Optionally, the SCS for receiving downlink channel(s) may be the SCS of the active downlink BWP receiving the downlink channel(s).

[0278] Optionally, in frequency domain, the reference resource associated with the downlink channel may be one or more frequency domain units of the downlink channel indicated / scheduled by the base station. Optionally, one or more frequency domain units of the downlink channel may be one or more frequency domain units occupied by the downlink channel. Optionally, the one or more frequency domain units of the downlink channel may be one or more frequency domain units where the downlink channel is located. Optionally, the CQI may be a wideband CQI or a subband CQI. Optionally, the wideband CQI is determined based on all frequency domain units in the one or more frequency domain units of the downlink channel. Optionally, the subband CQI is determined based on a part of the one or more frequency domain units of the downlink channel. Optionally, all frequency domain units of the downlink channel indicated by the base station may be divided into one or more subbands, where each subband includes at least one frequency domain unit. Optionally, each subband may correspond to a CQI. Each subband CQI is determined based on the measurement of the downlink channel on the frequency domain unit of the corresponding subband.

[0279] Optionally, in time domain, the reference resource associated with the downlink channel may be one or more time domain units of the downlink channel indicated / scheduled by the base station. Optionally, one or more time domain units of the downlink channel may be one or more time domain units occupied by the downlink channel. Optionally, the one or more time domain units of the downlink channel may be one or more time domain units where the downlink channel is located. Optionally, the number of time domain units occupied by the downlink channel and the reference signal associated with the downlink channel is equal to the number of the one or more time domain units.

[0280] Optionally, the RV associated with the downlink channel may be predefined or indicated by the base station. The RV associated with the downlink channel refers to the RV of the TB carried by the downlink channel. For example, the RV associated with the downlink channel may be RV#0. Optionally, the RV associated with the downlink channel may be the RV of the measured / received downlink channel. Optionally, the RV of the downlink channel may be indicated / scheduled by the base station.

[0281] Optionally, the modulation scheme associated with the downlink channel may be a predefined modulation scheme, or a modulation scheme of the measured / received downlink channel. Optionally, the predefined modulation scheme may correspond to BPSK or QPSK. Optionally, the modulation scheme of the measured / received downlink channel may be indicated by DCI or SPS configuration information scheduling / indicating / triggering the downlink channel.

[0282] Optionally, the code rate associated with the downlink channel may be a predefined code rate, or a code rate indicated by the base station, or a code rate of the measured / received downlink channel. Optionally, the code rate of the downlink channel may be a target code rate or an effective code rate. Optionally, the target code rate of the downlink channel may be determined based on DCI or SPS configuration information scheduling / indicating / triggering the downlink channel. Optionally, the effective code rate of the downlink channel may be determined based on the number of downlink information bits (e.g., Binfo) and the number of bits on the downlink channel (e.g., BPHY). For example, the effective code rate is equal to Binfo / BPHY. The bits on the downlink channel may be physical channel bits on the downlink channel.

[0283] Optionally, the TB size associated with the downlink channel may be the size of the TB included / carried by the downlink channel. The UE may determine the size of the TB carried by the downlink channel based on the indication of the base station. For example, the UE may determine the size of the TB carried by the downlink channel based on the target code rate, the modulation scheme, and the resource of the downlink channel indicated by the base station. For example, the TB size may be based on at least one of the followings: the target code rate (Tcodec), the modulation order (Qm), and the number of time-frequency units corresponding to the resource of the downlink channel (NRE). For example, the TB size may be equal to . The size of the TB may be understood as the number of information bits corresponding to the TB.

[0284] Optionally, the spatial domain parameter associated with the downlink channel may include the rank of the downlink channel and the antenna port of the downlink channel. Optionally, the CQI corresponding to the downlink channel is determined based on the rank of the downlink channel and / or the antenna port of the downlink channel. Optionally, the CQI corresponding to a TB in the downlink channel is determined based on the rank corresponding to the TB and / or the antenna port corresponding to the TB. The antenna port corresponding to the TB refers to the antenna port used for transmitting the TB. If the downlink channel includes a TB, the TB is mapped to all ports of the downlink channel. If the downlink channel includes two TBs, the two TBs are mapped to different ports of the downlink channel, respectively. The antenna port of the downlink channel to which the TB is mapped is determined based on the indication of the base station.

[0285] Optionally, the UE may determine / calculate the CQI associated with the downlink channel. Optionally, the CQI associated with the downlink channel may be the CQI corresponding to the highest CQI value satisfying at least one of the following conditions: the DL channel could be received with a transport block error probability not exceeding X. Optionally, the value of X may be 0.1 or 0.00001. Optionally, the value of X may be predefined or indicated by the base station. Optionally, the features associated with the downlink channel for CQI calculation are described above. The features associated with the downlink channel include the reference resource, the reference signal, the modulation scheme, the code rate, the TB size, the spatial domain parameter, and the redundancy version associated with the downlink channel.

[0286] The above method may facilitate the UE to perform CSI calculation based on the parameter with which the PDSCH is indicated, improving the flexibility of the CSI reporting.

[0287] The disclosure provides the measurement / reporting method for CSI reporting based on the downlink channel, so that the UE may initiate the corresponding CSI report by measuring the downlink channel, reducing the transmission overhead of the reference signal for CSI measurement and improving the efficiency of the communication system.

[0288] 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 channel state information (CSI) reporting configuration; at 502, the base station transmits K downlink channels, where K is predefined or indicated by the CSI reporting configuration and K≥1; and at 503, the base station receives CSI determined based on measurement of reference signals associated with the K downlink channels based on the CSI reporting configuration, where the K downlink channels satisfy at least one of the followings: the K downlink channels have hybrid automatic repeat request acknowledgement (HARQ-ACK) information; the K downlink channels are in a first cell; the K downlink channels are within a time window; the number of frequency domain units of the K downlink channels are the same and / or the number of the frequency domain units of the K downlink channels are greater than or equal to a frequency domain threshold; transmission configuration indication (TCI) states of the K downlink channels are the same; transmission occasions corresponding to the K downlink channels are not in a time domain unit for uplink; a first time domain unit associated with the K downlink channels and a second time domain unit associated with the uplink channel carrying the CSI of the K downlink channels satisfy a first time domain relation, where the first time domain relation includes that the second time domain unit is no earlier than the first time domain unit and / or time domain separation between the second time domain unit and the first time domain unit is greater than or equal to a time domain threshold; the K downlink channels are K semi-persistent scheduling (SPS) physical downlink shared channels (PDSCHs); the K downlink channels are dynamically scheduled PDSCHs, where the first cell is predefined or indicated by the base station, and the time window is predefined or indicated by the base station.

[0289] 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.

[0290] 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.

[0291] Furthermore, "at least one of / at least one" described in the disclosure includes any and / or all possible combinations of the listed items, and various embodiments and various examples of the embodiments described in the disclosure may be changed and combined in any appropriate form, and " / " described in the disclosure means "or".

[0292] The various illustrative logical blocks, modules, and circuits described in the 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.

[0293] 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.

[0294] 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.

[0295] 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.

[0296] 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.

[0297] It is to be understood that the specific order or hierarchy of steps in the methods of the 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 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.

[0298] The text and drawings are provided as examples only to aid the reader in understanding the 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 wireless communication system, the method comprising:receiving a channel state information (CSI) reporting configuration;receiving downlink channels; andreporting CSI determined based on reference signals associated with K downlink channels, based on the CSI reporting configuration, where K is predefined or indicated by the CSI reporting configuration, and K≥1,wherein the K downlink channels satisfy at least one of:the K downlink channels having hybrid automatic repeat request acknowledgement hybrid automatic repeat request acknowledgement (HARQ-ACK) information,a number of frequency domain units of the K downlink channels being same, orthe number of frequency domain units of the K downlink channels being greater than or equal to a frequency domain threshold.2.The method of claim 1, wherein the K downlink channels further satisfy at least one of:the K downlink channels being in a first cell,the K downlink channels being within a time window,transmission configuration indication (TCI) states of the K downlink channels being same,transmission occasions corresponding to the K downlink channels not being in a time domain unit for uplink,a second time domain unit associated with an uplink channel carrying CSI of the K downlink channels being no earlier than a first time domain unit associated with the K downlink channels,the K downlink channels being K semi-persistent scheduling (SPS) physical downlink shared channels (PDSCHs), orthe K downlink channels being K dynamically scheduled PDSCHs, orwherein the first cell is predefined or indicated by a base station, and the time window is predefined or indicated by the base station.3.The method of claim 1, wherein:the HARQ-ACK information for the K downlink channels and the CSI are reported on a same uplink channel, and / orthe HARQ-ACK information for the K downlink channels and the CSI are triggered by same first downlink control information (DCI).4.The method of claim 1, further comprising:determining whether to update the CSI based on at least one of:the HARQ-ACK information for at least one downlink channel of the K downlink channels,a number of frequency domain units of at least one downlink channel of the K downlink channels, ora time domain position of a reference signal associated with at least one downlink channel of the K downlink channels and a time domain position of an uplink channel carrying the CSI.5.The method of claim 2, wherein time domain separation of the second time domain unit and the first time domain unit is greater than or equal to a time domain threshold, andwherein the time domain threshold is determined based on at least one of content of the CSI or a UE capability.6.The method of claim 1, further comprising:detecting second downlink control information (DCI),wherein the second DCI triggers an aperiodic CSI report to carry the CSI, and the K downlink channels further satisfy at least one of:the K downlink channels being latest K downlink channels before a downlink channel carrying the second DCI,the HARQ-ACK information for the K downlink channels being ACK,the HARQ-ACK information for the K downlink channels being reported before the second DCI,the K downlink channels being physical downlink shared channels (PDSCHs), ortransmission configuration indication (TCI) states of the K downlink channels being same as an indicated TCI state.7.The method of claim 1, further comprising:receiving higher layer signaling,wherein the higher layer signaling triggers a periodic CSI report and / or a semi-persistent CSI report to carry the CSI, and the K downlink channels further satisfy at least one of:the K downlink channels being between a first CSI report for carrying the CSI and a latest CSI report based on the CSI reporting configuration before the first CSI report;the HARQ-ACK information for the K downlink channels being ACK.8.The method of any of claims 1 to 7, wherein the reference signals associated with the K downlink channels comprise at least one of:a reference signal associated with a downlink channel corresponding to a last information bit in the HARQ-ACK information for the K downlink channels,a reference signal associated with a last downlink channel of the K downlink channels in a time domain,a reference signal associated with a downlink channel with a latest first DCI corresponding to the K downlink channels, ora reference signal associated with each downlink channel of the K downlink channels.9.The method of any of claims 1 to 8, wherein if a reference signal associated with a k-th downlink channel of the K downlink channels is used for determining the CSI, the CSI is determined based on measurement quantities of all ports associated with a first TCI state of ports of the reference signal associated with the k-th downlink channel, andwherein the first TCI state is a predefined TCI state of Y TCI states associated with the k-th downlink channel, or a TCI state indicated by the CSI reporting configuration, 1≤k≤K, Y≥1.10.The method of claim 8, wherein the CSI comprises a channel quality indicator (CQI), wherein the CQI is determined based on at least one of reference resources, reference signals, modulation schemes, code rates, transport block TB sizes, spatial domain parameters, or redundancy versions which is associated with the K downlink channels, and wherein:the reference resources include time domain resources and / or frequency domain resources in which the K downlink channels are scheduled,the reference signals include reference signals indicated for the K downlink channels,the modulation schemes include modulation schemes indicated for the K downlink channels,the TB sizes include sizes of TBs carried by the K downlink channels,the spatial domain parameters include ranks indicated for the K downlink channels, and / or antenna ports indicated for the K downlink channels, andthe redundancy versions include redundancy versions indicator for the K downlink channels.11.The method of claim 8, wherein when K>1, the CSI comprises a first L1-RSRP and K-1 differential L1-RSRPs, wherein the K-1 differential L1-RSRPs are calculated with reference to the first L1-RSRP, and the first L1-RSRP corresponds to a reference signal associated with a downlink channel with a highest measured L1-RSRP of the reference signals associated with the K downlink channels.12.The method of any of claims 1 to 11, wherein the frequency domain threshold is predefined, or indicated by a base station, or determined based on a UE capability, or determined based on a size of an active bandwidth part (BWP) receiving the K downlink channels.13.A method performed by a base station in a wireless communication system, the method comprising:transmitting a channel state information (CSI) reporting configuration;transmitting downlink channels; andreceiving CSI, wherein the CSI is determined based on reference signals associated with K downlink channels, where K is predefined or indicated by the CSI reporting configuration and K≥1,wherein the K downlink channels satisfy at least one of:the K downlink channels having hybrid automatic repeat request acknowledgement HARQ-ACK information,a number of frequency domain units of the K downlink channels being same, orthe number of the frequency domain units of the K downlink channels being greater than or equal to a frequency domain threshold.14.A user equipment comprising:a transceiver; anda controller coupled to the transceiver, the controller is configured to perform the method of any of claims 1 to 12.15.A base station comprising:a transceiver; anda controller coupled to the transceiver, the controller is configured to perform the method of claim 13.

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