Method and apparatus for supporting low specification terminal in communication system

Abstract

Disclosed are a method and an apparatus for supporting a low specification terminal in a communication system. The method by a terminal comprises the steps of: determining whether to receive a downlink signal through a measurement resource on the basis of a priority rule; performing measurement on the basis of the downlink signal when it is determined that the terminal receives the downlink signal through the measurement resource; generating a channel state information (CSI) report on the basis of the measurement; and transmitting the CSI report to a base station through an uplink resource.

Description

Method and device for supporting low-spec terminals in a communication system

[0001] The present disclosure relates to communication technology, and more particularly, to technology for supporting low-spec terminals in a communication system.

[0002] Communication systems can be designed considering various scenarios, service requirements, and potential system compatibility. In 5G communication systems (e.g., new radio (NR) communication systems) and / or beyond 5G communication systems (e.g., 6G communication systems), both terrestrial network (TN) and non-terrestrial network (NTN) communication are being discussed. It is expected that TN and / or NTN communication will be implemented. NTN communication may be implemented using satellites and / or aircraft. NTN communication may be implemented based on a different method than TN communication.

[0003] In a communication system supporting TN communication and / or NTN communication, terminals with various functions may exist. The terminals may have different communication performances and / or different requirements. Among reduced capability terminals, some reduced capability terminals may only perform one of downlink (DL) reception and uplink (UL) transmission operations in the same time interval even in a paired spectrum environment supporting frequency division duplex (FDD). In other words, some reduced capability terminals may be half duplex (HD)-FDD UEs. HD-FDD UEs may only perform one of DL reception and UL transmission operations in the same time interval. For HD-FDD UEs existing in TN, terminal operations (e.g., collision handling operations) may be supported when DL reception and UL transmission collide. In NTN, propagation delays of tens of milliseconds or more can exist in the service link between the terminal and the satellite, and in the feeder link between the satellite and the ground station. Methods to improve existing collision handling operations by taking these propagation delays into account may be necessary.

[0004] The purpose of the present disclosure to solve the above problems is to provide a method and device for supporting a reduced capability terminal in a communication system supporting TN (terrestrial network) communication and / or NTN (non-terrestrial network) communication.

[0005] According to embodiments of the present disclosure for achieving the above object, a method of a terminal includes: determining whether to receive a downlink signal based on a priority rule in a measurement resource; performing a measurement based on the downlink signal when it is determined that the terminal receives the downlink signal in the measurement resource; generating a CSI (channel state information) report based on the measurement; and transmitting the CSI report to a base station in an uplink resource.

[0006] The terminal may not perform an uplink transmission operation and a downlink reception operation simultaneously in a paired spectrum based on FDD (frequency division duplex), and the terminal may perform one operation among the uplink transmission operation and the downlink reception operation in the same time period of the paired spectrum.

[0007] When the downlink signal collides with the uplink signal in the above measurement resource, whether or not to receive the downlink signal can be determined based on the priority rule.

[0008] The above measurement resource may include at least one of a channel measurement resource (CMR) or an interference measurement resource (IMR).

[0009] The above CSI report may be determined based on the measurement in a CSI reference resource within the measurement resource or the measurement in a resource prior to the CSI reference resource, and the CSI reference resource may be determined based on a preset value for a non-terrestrial network (NTN) delay.

[0010] The time from the resource where the last measurement was performed within the above measurement resource to the uplink resource where the CSI report is transmitted may be the CPU (CSI processing unit) occupancy time.

[0011] The CPU occupancy time may end from the time at which it is determined that transmission of the CSI report is not performed based on the above priority rule.

[0012] If it is determined that the terminal cannot receive the downlink signal in the above measurement resource, transmission of the CSI report may be omitted.

[0013] If the preset value for NTN delay is greater than the threshold, transmission of the CSI report may be omitted.

[0014] According to embodiments of the present disclosure for achieving the above object, a method of a terminal includes the steps of: receiving information indicating deactivation of a first hybrid automatic repeat request (HARQ) process identifier (ID) from a base station; determining whether to receive a physical downlink shared channel (PDSCH) associated with the first HARQ process ID based on a priority rule; and determining whether to receive a physical downlink control channel (PDCCH) for scheduling another PDSCH based on whether to receive the PDSCH.

[0015] If the first HARQ process ID is disabled, HARQ feedback for the PDSCH associated with the first HARQ process ID may not be transmitted.

[0016] If reception of the PDSCH and transmission of an uplink signal collide in the same time interval, whether the PDSCH is received can be determined based on the priority rule.

[0017] If the terminal is determined to receive the PDSCH based on the priority rule, the terminal may not receive the PDCCH scheduling the other PDSCH within a preset time from the last symbol of the PDSCH.

[0018] If the terminal is determined not to receive the PDSCH based on the priority rule, the terminal can receive the PDCCH scheduling the other PDSCH within a preset time from the last symbol of the PDSCH.

[0019] If the PDSCH belongs to slot-aggregated PDSCHs and the terminal is determined not to receive the PDSCH based on the priority rule, the preset time may be determined based on the last received PDSCH among the slot-aggregated PDSCHs.

[0020] According to embodiments of the present disclosure for achieving the above object, a terminal includes at least one processor, wherein the at least one processor causes the terminal to determine whether to receive a downlink signal based on a priority rule in a measurement resource; perform measurement based on the downlink signal when the terminal is determined to receive the downlink signal in the measurement resource; generate a CSI (channel state information) report based on the measurement; and transmit the CSI report to a base station in an uplink resource.

[0021] The terminal may not perform an uplink transmission operation and a downlink reception operation simultaneously in a paired spectrum based on FDD (frequency division duplex), and the terminal may perform one operation among the uplink transmission operation and the downlink reception operation in the same time period of the paired spectrum.

[0022] When the downlink signal collides with the uplink signal in the above measurement resource, whether or not to receive the downlink signal can be determined based on the priority rule.

[0023] The above CSI report may be determined based on the measurement in a CSI reference resource within the measurement resource or the measurement in a resource prior to the CSI reference resource, and the CSI reference resource may be determined based on a preset value for a non-terrestrial network (NTN) delay.

[0024] If it is determined that the terminal cannot receive the downlink signal in the above measurement resource, transmission of the CSI report may be omitted.

[0025] According to the present disclosure, a method for determining a communication direction (e.g., downlink (DL) or uplink (UL)) for a reduced capability terminal supporting HD (half duplex)-FDD (frequency division duplex) operation in consideration of a non-terrestrial network (NTN) environment in a communication system can be provided. A method for reporting channel state information (CSI) for a reduced capability terminal supporting HD-FDD operation in consideration of an NTN environment can be provided. Accordingly, the performance of the communication system can be improved. The effects that can be obtained by the present disclosure may not be limited to the above effects. Other effects not mentioned above may be clearly understood by those skilled in the art from the embodiments of the present disclosure and / or the technical field to which the present disclosure pertains.

[0026] Figure 1 is a conceptual diagram illustrating embodiments of a communication system.

[0027] Figure 2 is a block diagram illustrating embodiments of communication nodes constituting a communication system.

[0028] Figure 3 is a conceptual diagram illustrating embodiments of a wireless interface protocol structure in a communication system.

[0029] FIG. 4 is a conceptual diagram illustrating examples of time resources through which wireless signals are transmitted in a communication system.

[0030] Figure 5 is a conceptual diagram for explaining the time difference between the reception timing of the #i-th downlink frame and the transmission timing of the #i-th uplink frame in a communication system.

[0031] Figure 6 is a conceptual diagram illustrating embodiments of a time / frequency resource grid of a communication system.

[0032] Figure 7 is a conceptual diagram illustrating embodiments of SS / PBCH blocks in a communication system.

[0033] Figure 8 is a conceptual diagram illustrating common delays in an NTN environment.

[0034] Figures 9a to 9d are conceptual diagrams illustrating various forms of a three-dimensional space communication system.

[0035] Figure 10a is a conceptual diagram illustrating embodiments of HD GP (half-duplex guard period) according to terminal capabilities.

[0036] Figure 10b is a conceptual diagram illustrating embodiments of HD GP according to terminal capabilities.

[0037] Figure 11a is a conceptual diagram illustrating CSI reporting methods of an NTN HD terminal.

[0038] Figure 11b is a conceptual diagram illustrating CSI reporting methods of NTN HD terminals.

[0039] Figure 12 is a conceptual diagram illustrating CSI reporting methods of NTN HD terminals.

[0040] Figure 13 is a conceptual diagram illustrating CSI reporting methods of NTN HD terminals.

[0041] FIG. 14a is a conceptual diagram illustrating embodiments of a PDSCH reception method based on a disabled HARQ process.

[0042] FIG. 14b is a conceptual diagram illustrating embodiments of a PDSCH reception method based on a disabled HARQ process.

[0043] Fig. 15 is a conceptual diagram illustrating embodiments of a PDSCH reception method based on a disabled HARQ process.

[0044] Figure 16 is a flowchart illustrating a CSI reporting method.

[0045] Figure 17 is a flowchart illustrating a method for receiving a PDSCH based on a disabled HARQ process.

[0046] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated and described in detail in the drawings. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

[0047] While terms such as "first" and "second" may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component." The term "and / or" encompasses any combination of multiple related items described herein or any one of multiple related items described herein.

[0048] In the embodiments of the present application, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B.” Furthermore, in the embodiments of the present application, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B.”

[0049] In the embodiments of the present application, (re)transmission may mean “transmission,” “retransmission,” or “transmission and retransmission,” (re)setting may mean “setting,” “resetting,” or “setting and resetting,” (re)connection may mean “connection,” “reconnection,” or “connection and reconnection,” and (re)connection may mean “connection,” “reconnection,” or “connection and reconnection.”

[0050] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0051] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprise" or "have" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0052] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0053] Hereinafter, with reference to the attached drawings, preferred embodiments of the present invention will be described in more detail. In order to facilitate an overall understanding in describing the present invention, identical reference numerals will be used for identical components in the drawings, and redundant descriptions of identical components will be omitted.

[0054] A communication network to which embodiments of the present invention are applied will be described. The communication network may be a non-terrestrial network (NTN), a 4G communication network (e.g., a long-term evolution (LTE) communication network), a 5G communication network (e.g., a new radio (NR) communication network), or a 6G communication network. The 4G communication network and the 5G communication network can be classified as terrestrial networks.

[0055] The non-terrestrial network may operate based on LTE technology and / or NR technology and / or 6G technology. The non-terrestrial network may support communication in frequency bands above 6 GHz as well as below 6 GHz. 4G communication networks may support communication in frequency bands below 6 GHz. 5G and / or 6G communication networks may support communication in frequency bands above 6 GHz as well as below 6 GHz. The communication networks to which embodiments of the present invention are applied are not limited to those described below, and the embodiments of the present invention may be applied to various communication networks. Here, the term "communication network" may be used interchangeably with the term "communication system."

[0056] In the present disclosure, “an operation (e.g., a transmission operation) is set” may mean that “setting information for the operation (e.g., information, information elements, parameters)” and / or “information instructing performance of the operation” are signaled. “Information (e.g., information elements, parameters) is set” may mean that the information is signaled. In the present disclosure, the signaling may be at least one of system information (SI) signaling (e.g., transmission of a system information block (SIB) and / or a master information block (MIB)), RRC signaling (e.g., transmission of RRC parameters and / or upper layer parameters), MAC control element (CE) signaling, or PHY signaling (e.g., transmission of downlink control information (DCI), uplink control information (UCI), and / or sidelink control information (SCI)).

[0057] Throughout the specification, the network may include, for example, wireless internet such as WiFi (wireless fidelity), mobile internet such as WiBro (wireless broadband internet) or WiMax (world interoperability for microwave access), 2G mobile communication networks such as GSM (global system for mobile communication) or CDMA (code division multiple access), 3G mobile communication networks such as WCDMA (wideband code division multiple access) or CDMA2000, 3.5G mobile communication networks such as HSDPA (high speed downlink packet access) or HSUPA (high speed uplink packet access), 4G mobile communication networks such as LTE (long term evolution) or LTE-Advanced, 5G mobile communication networks, and 6G mobile communication networks.

[0058] Throughout the specification, a terminal may be referred to as a terminal, an access terminal, a mobile terminal, a station, a subscriber station, a mobile station, a portable subscriber station, a node, a device, etc.

[0059] Here, a desktop computer, laptop computer, tablet PC, wireless phone, mobile phone, smart phone, smart watch, smart glass, e-book reader, portable multimedia player (PMP), portable game console, navigation device, digital camera, digital multimedia broadcasting (DMB) player, digital audio recorder, digital audio player, digital picture recorder, digital picture player, digital video recorder, digital video player, etc. capable of communicating with the terminal can be used.

[0060] Throughout the specification, a base station may be referred to as a NodeB, an evolved NodeB, a 5G NodeB (gNB), a 6G node, a base transceiver station (BTS), a radio base station, a radio transceiver, an access point, an access node, a road side unit (RSU), a digital unit (DU), a cloud digital unit (CDU), a radio remote head (RRH), a radio unit (RU), a transmission point (TP), a transmission and reception point (TRP), a relay node (repeater node), etc.

[0061] Figure 1 is a conceptual diagram illustrating embodiments of a communication system.

[0062] Referring to FIG. 1, a communication system (100) may include a plurality of communication nodes (110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6). The plurality of communication nodes may support 4G communication (e.g., long term evolution (LTE), advanced LTE-A (LTE-A), 5G communication (e.g., new radio (NR)), 6G communication, etc.) specified in the 3rd generation partnership project (3GPP) standard. 4G communication may be performed in a frequency band of 6 GHz or less, and 5G and 6G communication may be performed in a frequency band of 6 GHz or more as well as a frequency band of 6 GHz or less.

[0063] For example, for 4G communication, 5G communication, and 6G communication, multiple communication nodes may use a communication protocol based on CDMA (code division multiple access), a communication protocol based on WCDMA (wideband CDMA), a communication protocol based on TDMA (time division multiple access), a communication protocol based on FDMA (frequency division multiple access), a communication protocol based on OFDM (orthogonal frequency division multiplexing), a communication protocol based on Filtered OFDM, a communication protocol based on CP (cyclic prefix)-OFDM, a communication protocol based on DFT-s-OFDM (discrete Fourier transform-spread-OFDM), a communication protocol based on OFDMA (orthogonal frequency division multiple access), a communication protocol based on SC (single carrier)-FDMA, a communication protocol based on NOMA (Non-orthogonal Multiple Access), a communication protocol based on GFDM (generalized frequency division multiplexing), a communication protocol based on FBMC (filter bank multi-carrier), a communication protocol based on UFMC (universal filtered multi-carrier), a communication protocol based on SDMA (Space Division Multiple Access), It can support communication protocols based on OTFS (orthogonal time-frequency space).

[0064] In addition, the communication system (100) may further include a core network. If the communication system (100) supports 4G communication, the core network may include a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), a mobility management entity (MME), etc. If the communication system (100) supports 5G communication and 6G communication, the core network may include a user plane function (UPF), a session management function (SMF), an access and mobility management function (AMF), etc.

[0065] Meanwhile, each of the plurality of communication nodes (110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6) constituting the communication system (100) may have the following structure.

[0066] Figure 2 is a block diagram illustrating embodiments of communication nodes constituting a communication system.

[0067] Referring to FIG. 2, a communication node (200) may include at least one processor (210), a memory (220), and a communication device (230) that is connected to a network and performs communication. In addition, the communication node (200) may further include an input interface device (240), an output interface device (250), a storage device (260), etc. Each component included in the communication node (200) may be connected by a bus (270) and communicate with each other.

[0068] However, each component included in the communication node (200) may be connected through an individual interface or individual bus centered around the processor (210), rather than a common bus (270). For example, the processor (210) may be connected to at least one of the memory (220), the communication device (230), the input interface device (240), the output interface device (250), and the storage device (260) through a dedicated interface.

[0069] The processor (210) can execute program commands stored in at least one of the memory (220) and the storage device (260). The processor (210) may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor in which methods according to embodiments of the present invention are performed. Each of the memory (220) and the storage device (260) may be configured with at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory (220) may be configured with at least one of a read-only memory (ROM) and a random access memory (RAM).

[0070] Referring again to FIG. 1, the communication system (100) may include a plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) and a plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6). The communication system (100) including the base stations (110-1, 110-2, 110-3, 120-1, 120-2) and the terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) may be referred to as an “access network.” The first base station (110-1), the second base station (110-2), and the third base station (110-3) can each form a macro cell. The fourth base station (120-1) and the fifth base station (120-2) can each form a small cell. The fourth base station (120-1), the third terminal (130-3), and the fourth terminal (130-4) can be within the cell coverage of the first base station (110-1). The second terminal (130-2), the fourth terminal (130-4), and the fifth terminal (130-5) can be within the cell coverage of the second base station (110-2). The fifth base station (120-2), the fourth terminal (130-4), the fifth terminal (130-5), and the sixth terminal (130-6) may be within the cell coverage of the third base station (110-3). The first terminal (130-1) may be within the cell coverage of the fourth base station (120-1). The sixth terminal (130-6) may be within the cell coverage of the fifth base station (120-2).

[0071] Here, each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be referred to as a NodeB, an evolved NodeB, a gNB, a BTS (base transceiver station), a radio base station, a radio transceiver, an access point, an access node, etc. Each of the plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) may be referred to as a UE (user equipment), a terminal, an access terminal, a mobile terminal, a station, a subscriber station, a mobile station, a portable subscriber station, a node, a device, etc.

[0072] Meanwhile, each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may operate in a different frequency band or may operate in the same frequency band. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be connected to each other via an ideal backhaul link or a non-ideal backhaul link, and may exchange information with each other via the ideal backhaul link or the non-ideal backhaul link. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be connected to the core network via the ideal backhaul link or the non-ideal backhaul link. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can transmit a signal received from the core network to the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6), and can transmit a signal received from the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) to the core network.

[0073] FIG. 3 is a conceptual diagram illustrating embodiments of a radio interface protocol architecture in a communication system.

[0074] Referring to FIG. 3, one embodiment of a wireless interface protocol structure (300) of a communication system may include a radio resource control (RRC) layer (310), a medium access control (MAC) layer (320), a physical (PHY) layer (330), etc. One embodiment of the wireless interface protocol structure (300) illustrated in FIG. 3 may correspond to various interface embodiments, such as an interface between a terminal and a base station, an interface between an IAB-node DU (distributed unit) of an IAB (integrated access backhaul) network and an IAB-node MT (mobile terminal), an interface between an IAB-node DU and a lower node (e.g., a terminal), an interface between an IAB-node MT and an upper node, and an interface between a plurality of terminals.

[0075] Near the PHY layer (330), an RRC layer (310) and a MAC layer (320) may be placed above the PHY layer (330). For example, the MAC layer (320) may be placed above the PHY layer (330). The RRC layer (310) may be placed above the MAC layer (320).

[0076] The MAC layer (320) may be connected to a higher layer (e.g., the RRC layer (310)) through logical channels (315). The PHY layer (330) may be connected to the higher MAC layer (320) through transport channels (325). The PHY layer (330) may exchange control information and / or measurement information (350) with the RRC layer (310).

[0077] The PHY layer (330) may be referred to as 'layer 1' or 'L1'. The MAC layer (320) may be referred to as 'layer 2' or 'L2'. The RRC layer (310) may be referred to as 'layer 3' or 'L3'. The RRC layer (310) and the MAC layer (320) may be collectively referred to as 'upper layers'.

[0078] In the present disclosure, 'L1 signaling' may refer to signaling such as downlink control information (DCI) transmitted through a physical downlink control channel (PDCCH), which is a PHY layer (330) channel, uplink control information (UCI) transmitted through a physical uplink control channel (PUCCH), and sidelink control information (SCI) transmitted through a physical sidelink control channel (PSCCH). Similarly, 'upper layer signaling' in the present disclosure may include L2 signaling transmitted through a MAC control element (CE), L3 signaling transmitted through RRC signaling, etc.

[0079] In communication systems such as 5G, one or more of the numerologies in Table 1 may be used for various purposes, such as reducing inter-carrier interference (ICI) according to frequency band characteristics and reducing latency according to service characteristics.

[0080]

[0081] Table 1 is merely an example for convenience of explanation, and embodiments of numerologies used in a communication system may not be limited thereto. Numerology μ may correspond to information of subcarrier spacing (SCS) Δf and cyclic prefix (CP). A terminal may identify numerology μ and CP applied to a downlink bandwidth part and / or an uplink bandwidth part based on subcarrierSpacing and / or cyclicPrefix, which are parameters of a higher layer.

[0082] FIG. 4 is a conceptual diagram illustrating examples of time resources through which wireless signals are transmitted in a communication system.

[0083] Referring to FIG. 4, the time resource for transmitting a wireless signal in a communication system (400) is one or more ( ) a frame (430) consisting of a subframe (420), one or more ( ) a subframe (420) consisting of a slot (410), and It can be expressed as a slot (410) consisting of OFDM symbols. The values ​​may follow the values ​​in Table 2 if they are regular cyclic prefixes according to the set numeral. The values ​​may follow the values ​​in Table 3 in case of an extended cyclic prefix according to the set numerology. OFDM symbols included in one slot may be distinguished as downlink (DL) symbols, flexible (FL) symbols, or uplink (UL) symbols by upper layer signaling or a combination of upper layer signaling and L1 signaling.

[0084]

[0085]

[0086] In an NR communication system (e.g., a 5G communication system), a frame (430) may have a length of 10 ms, and a subframe (420) may have a length of 1 ms. The frame (230) may be divided into two half-frames having the same length, and a first half-frame (half-frame #0) may be composed of sub-frames #0 to #4, and a second half-frame (half-frame #1) may be composed of sub-frames #5 to #9. One carrier may include a set of uplink frames and a set of downlink frames. FIG. 5 is a conceptual diagram for explaining a time difference between the reception timing of the #i-th downlink frame and the transmission timing of the #i-th uplink in a communication system.

[0087] Referring to FIG. 5, the time difference between the reception timing of downlink frame #i (500) and the transmission timing of uplink frame #i (510) is T TA (520) may be. The terminal may compare T with the start time of reception of downlink frame #i (500). TA Transmission for uplink frame #i (510) can be started at an earlier point in time. T TA can be named as timing advance (TA) or timing adjustment (TA). The base station informs the terminal of T through upper layer signaling or L1 signaling. TA You can instruct it to change the value. For example, The application can be set at the base station and / or terminal. In the NR communication system, T c Is can be defined as Δf max is Δf max = can be defined as 480kHz, and Nf is N f = can be defined as 4096, and N TA,offset can be a value set by L3 signaling, and N TA T is indicated by L2 signaling A And it can be a value determined based on the mathematical formula 1 below.

[0088]

[0089] N TA,offset and N TA The description may be an example for a specific situation. Various options may exist other than the above description, but not all possible cases may be listed in this disclosure so as not to obscure the gist of the description.

[0090] Figure 6 is a conceptual diagram illustrating embodiments of a time / frequency resource grid of a communication system.

[0091] Referring to FIG. 6, the time / frequency resource grid (600) of the communication system subcarriers of the dog and It can be composed of OFDM symbols. The resource grid can be defined per numeral and / or per carrier. may be the location of a common resource block (CRB) indicated by upper layer signaling. may be the number of resource blocks (RBs) (610) starting from the CRB. In other words, may mean carrier bandwidth. and / or can have different values ​​for each link direction (e.g., uplink, downlink, sidelink) or for each numerology (μ). The numerology (μ) can be referred to by other terms, such as subcarrier spacing (SCS) settings, as needed.

[0092] Each element within the resource grid for setting the antenna port (p) and SCS (μ) may be referred to as a resource element (RE) (620). The RE (620) is Each position can be uniquely defined. k can be an index (e.g., a subcarrier index) in the frequency domain, and l can mean a symbol position (e.g., a symbol index) in the time domain. is a physical channel or signal complex value may correspond to physical resources used to transmit. One resource block (610) is continuous in the frequency domain. can be defined as a set of subcarriers.

[0093] Compared to 3G / 4G communication systems, 5G communication systems can use a wider carrier bandwidth. To reduce the high implementation complexity and / or high power consumption of terminals due to the wide carrier bandwidth, the concept of a bandwidth part (BWP) can be introduced. A bandwidth part can be composed of consecutive common resource blocks, and the starting resource block position of the bandwidth part ( ) and the number of resource blocks that constitute the corresponding bandwidth portion ( ) can satisfy mathematical expressions 2 and 3.

[0094]

[0095]

[0096] Within a single component carrier (CC), up to four downlink bandwidth segments can be configured for a terminal. Only one downlink bandwidth segment can be activated at a time. The terminal may not receive physical downlink shared channels (PDSCHs), physical downlink control channels (PDCCHs), or channel state information reference signals (CSI-RSs) outside of the activated bandwidth segments.

[0097] Within a single component carrier, up to four uplink bandwidth segments can be configured for a terminal. Of the configured uplink bandwidth segments, only one uplink bandwidth segment can be activated at a time. The terminal may not transmit PUSCH (physical uplink shared channel), PUCCH (physical uplink control channel), SRS (sounding reference signal), or other bandwidth segments outside of the activated bandwidth segment.

[0098] FIG. 7 is a conceptual diagram illustrating embodiments of a synchronization signal and physical broadcast channel block (SSB) in a communication system.

[0099] Referring to FIG. 7, the SS / PBCH block (700) of the communication system may include a primary synchronization signal (PSS) transmitted in the middle 127 subcarriers of the first OFDM symbol, a secondary synchronization signal (SSS) transmitted in the middle 127 subcarriers of the third OFDM symbol, and a physical broadcast channel (PBCH) transmitted in the second, third, and fourth OFDM symbols. The PBCH, which occupies the widest bandwidth, may be transmitted over 20 RBs. 20 RBs may be 3.6 MHz based on a 15 kHz SCS. The base station may transmit one SSB using the same beam. When the number of antennas of the base station increases, it may be necessary to operate multiple beams, such as when more than one analog beam is applied to support high frequencies. In this case, the base station can support multi-beam operation by transmitting multiple SSBs. A beam may be expressed in various terms such as transmit precoding and spatial transmission filter. However, in order not to obscure the main point of the explanation, transmission precoding, spatial transmission filter, etc. may be referred to as beam.

[0100] The base station can transmit multiple SSBs (730, 740, 750, 760) to represent multiple beams (e.g., beam #1, beam #2, beam #3, beam #4). One or more SSBs can be transmitted in one slot according to a pre-arranged pattern for each numerology. SSBs (730, 740, 750, 760) to which different beams are applied can be included in an SS burst (720). In other words, SSBs (730, 740, 750, 760) to which different beams are applied can be configured as one set. The terminal can assume a half-frame window having a length of 5 ms at the time of monitoring the SSB. An SS burst set (715) configured by upper layer signaling within the half-frame window can include one or more SS bursts (720). The terminal may not know or be unable to use the RRC configuration value(s) during the initial access (IA) procedure. In this case, the terminal may assume that the period of the SS burst set (710) is 20 ms and perform reception and / or measurement operations for SSB based on this assumption.

[0101] In the present disclosure, the downlink network structure and the uplink network structure can be independently configured considering a non-terrestrial network (NTN) environment. For example, the downlink network structure and the uplink network structure can be configured differently. Considering the NTN environment, the network structure can be independently configured for each component carrier (CC), carrier group (CG), and / or cell. For example, the network structure can be configured differently for each CC, CG, and / or cell. In order to compensate for uplink propagation loss considering the NTN environment, the transmission gain of a relay (or repeater) can be controlled. When a terminal performs DC (dual connectivity) operation for a terrestrial network (TN)-NTN or NTN-NTN, uplink communication (e.g., uplink transmission) can be controlled based on power reduction and / or an external power source.

[0102] When a terminal performs a DC operation for TN-NTN or NTN-NTN, power alignment for downlink communication (e.g., downlink reception) to reduce a dynamic range may be requested. In the present disclosure, uplink transmission may mean uplink communication, and downlink reception may mean downlink communication. The dynamic range may be a power dynamic range. The power dynamic range may mean the difference between the minimum power and the maximum power for a specific resource, or the difference between the power (e.g., actual power) and the average power for a specific resource. The specific resource may be an RE, a symbol, an RB, a subband, a carrier, etc. Alternatively, the power dynamic range may mean the difference between the power for a first network (e.g., received power, transmitted power, average power, minimum power, maximum power) and the power for a second network (e.g., received power, transmitted power, average power, minimum power, maximum power).

[0103] Figure 8 is a conceptual diagram illustrating common delays in an NTN environment.

[0104] Referring to FIG. 8, at least three types of wireless links may exist in an NTN environment (e.g., an NTN scenario). The at least three types of wireless links may include a service link (831), an inter-satellite link (ISL) (841), and a feeder link (851, 852). The service link (831) may be a link between a terminal (810) and a satellite (821). The ISL (841) may be a link between satellites (821, 822). The feeder link (851, 852) may be a link between a terrestrial network (860) connected to a data network (870) and satellites (821, 822). The terrestrial network (860) may be a terrestrial gateway.

[0105] The terminal can calculate (e.g., determine) the timing advance (TA) of the terminal based on position information acquired from a global navigation satellite system (GNSS) and / or ephemeris information of a serving satellite. The TA can be determined based on the following mathematical expression 4. The ephemeris information can be acquired from a serving satellite (e.g., a serving base station).

[0106]

[0107] N TA can be defined as 0 for PRACH. N TA may be updated based on the TA command field of the msg2, msgB, and / or MAC CE TA command. N TA,UE-specific can be used to pre-compensate for delays in service links. N TA,UE-specific may be a TA estimated by the terminal itself. N TA,common can be a network control public TA. N TA,common may include timing offsets that are deemed necessary in a network (e.g., a telecommunications network). N TA,common can support values ​​of 0. N TA,offset may be a fixed offset used to calculate TA. The terminal may not assume that the round trip time (RTT) between the terminal and the base station is the same as the TA calculated for msg1 / msgA.

[0108] The validity period of ephemeris information (e.g., satellite ephemeris data) may indicate the maximum time that a terminal can apply satellite ephemeris (e.g., existing satellite ephemeris) without acquiring new ephemeris information. The validity period of ephemeris information may be set by the network. N TA The update procedure can be performed based on the TA command of msg2 / msgB and / or the TA command of MAC CE. NTA The update procedure can be used for alignment (e.g., adjustment, modification, control) of uplink timing. When msg2 / msgB containing a TA command (e.g., TA) is received, the terminal can perform the first adjustment (e.g., alignment, modification, control) procedure. N TA can be updated as shown in mathematical formula 5 below.

[0109]

[0110] T in Equation 5 A may be indicated by the TA command field contained in msg2 / msgB. If a MAC CE containing a TA command is received, N TA can be updated as shown in mathematical formula 6 below.

[0111]

[0112] T in Equation 6 A may be indicated by the TA command field included in the MAC CE. The common TA (e.g., common TA) may include a parameter indicating timing drift. The terminal may apply the common TA based on the parameter(s) provided by the network. If the requirement(s) for uplink timing error are defined, the offset between the common TA according to the parameters provided by the network and the RTT of the actual feeder link may not be considered.

[0113] Scheduling offset (K) to improve timing relationship offset ) can be introduced. Scheduling offset (K offset ) can be set by system information, and the scheduling offset (K offset ) can be used in the initial access procedure. In this case, the cell-specific K used in all beams of at least one cell offset The setting of K can be supported offset In addition, the scheduling offset for MAC CE is Kmac can be defined as

[0114] Downlink frame timing and uplink frame timing can be aligned to the base station. In this case, K is used for terminal operation and / or assumption regarding downlink and uplink settings indicated by the MAC CE command transmitted on the PDSCH. mac may not be required. On the other hand, the downlink frame timing and the uplink frame timing may not be aligned to the base station. In this case, K may be used for terminal operation and / or assumption regarding the downlink configuration indicated by the MAC CE command transmitted on the PDSCH. mac may be required, and K for terminal operation and / or assumptions regarding uplink configuration as indicated by the MAC CE command transmitted on the PDSCH. mac may not be necessary. K mac The information may be included in the system information. In other words, the base station is K mac System information including information can be transmitted to the terminal. The terminal can receive the system information from the base station and K included in the system information. mac You can check the information.

[0115] After the initial connection procedure, K offset Updates may be supported for receiving TA commands. offset By introducing K, the adjustment (e.g., alignment, correction, control) of uplink transmission timing can be supplemented. After the initial access procedure, K offset For updates, the network (e.g., base station) uses MAC CE to update UE-specific K offset can provide and / or update cell-specific K set by system information. offsetFor , one of the following two options (e.g., options 1 and 2) may be selected. Option 1 may be signaling one offset value. For example, the value signaled according to option 1 may include the RTT of the service link and the RTT between the service satellite (e.g., the serving satellite) and the reference point (e.g., the reference point). In the present disclosure, the signaling may be at least one of SI (system information) signaling, RRC signaling, MAC CE signaling, or PHY signaling.

[0116] Option 2 may signal two offset values. The two offset values ​​may include a first offset value and a second offset value. K offset can be the sum of two offset values. The first offset value can be the RTT between the serving satellite and the reference point (or a value determined based on the common TA). The second offset value can be the RTT of the service link. The value indicated by the system information (e.g., K offset ) other than K offset If not provided to this terminal, the terminal shall use a value indicated by system information (e.g., K offset ) can be applied to improve all timing relationships. The network (e.g., base station) can use K for MAC CE. offset K is a scheduling offset other than mac can be provided to the terminal. The network is K mac If the terminal does not provide K mac =0 can be assumed.

[0117] The estimate of the terminal-base station RTT is the TA and K of the terminal. maccan be equal to the sum of the terminal-base station RTT. The terminal-base station RTT can mean the RTT in the link between the terminal and the base station. The terminal-base station RTT can mean the RTT between the terminal and the base station. The terminal's TA is T TA can be determined based on the base station-satellite RTT estimate N TA,common ×T c Wow K mac can be equal to the sum of . Base station-satellite RTT can mean the RTT in the link between the base station and the satellite. If the network is K mac If the terminal does not provide K mac =0 can be assumed.

[0118] NTN ephemeris (e.g., ephemeris information) can be divided into the serving cell's ephemeris and the neighboring cell's ephemeris. Information about when a cell will cease local service and / or timing information (e.g., timers and / or absolute time) for a new cell can be supported, at least in an Earth-fixed NTN scenario. Whether both types of ephemeris information (e.g., serving cell's ephemeris information and neighboring cell's ephemeris information) are required can be determined based on system information and / or ephemeris information.

[0119] At least for uplink scheduling adaptation, a UE can report information about UE-specific TA pre-compensation. During an RA procedure, the UE can report the UE-specific TA pre-compensation to the base station using MAC CE. If the reporting operation is enabled by the network, the UE can report the UE-specific TA pre-compensation information to the base station (e.g., the network) in an RA procedure using MAC CE (e.g., the transmission procedure of msgA, the transmission procedure of msg3, and / or the transmission procedure of msg5). The content of the UE-specific TA pre-compensation reported in the RA procedure using MAC CE may be UE-specific TA. UE-specific TA reporting (e.g., reporting of UE-specific TA pre-compensation) in the RA procedure may be enabled / disabled by SI (system information). UE-specific TA reporting (e.g., reporting information about UE-specific TA) may be supported in a connected mode (e.g., RRC connected mode). Event triggers may be supported to report information about UE-specific TAs in connected mode. If an event trigger is configured, the UE may report information about UE-specific TA pre-compensation to the target cell during the RA procedure.

[0120] If the UE cannot report UE location information in connected mode, the content of the UE-specific TA reported to the base station in connected mode may be UE-specific TA pre-compensation. If the content of the information about the UE-specific TA reported to the base station is UE location information in connected mode, RRC signaling may be used to report the UE location information (e.g., information about the UE-specific TA). If the UE location information can be reported to the base station in connected mode, for the purpose of TA reporting (e.g., reporting information about the UE-specific TA, reporting UE location information) in connected mode, the network (e.g., the base station) may configure the UE to report the UE-specific TA pre-compensation and / or the UE location information. If the content of the information about the UE-specific TA to be reported to the network is the value of the TA pre-compensation (e.g., UE-specific TA pre-compensation) in connected mode, the UE may report the information about the UE-specific TA using MAC CE.

[0121] UE location reporting can be performed based on an event trigger. Event-triggered UE location reporting can be configured by the base station to obtain information on UE location updates of a mobile terminal in a connected mode (e.g., RRC connected mode). In other words, the base station can transmit configuration information for event-based UE location reporting to the terminal. Periodic UE location reporting can be configured by the base station to obtain information on UE location updates of a mobile terminal in a connected mode (e.g., RRC connected mode).

[0122] To enable the UE to report information about UE-specific TAs during a handover procedure, a new indication of RRC reconfiguration using synchronization may not be required. SI (e.g., SIB) may indicate whether information indicating the activation or deactivation of TA reporting (e.g., reporting information about UE-specific TAs) in the target cell is transmitted via the handover command.

[0123] Information about UE-specific TA pre-compensation may not be reported in RA procedures triggered by requests from other SIs. The event trigger for reporting information about UE-specific TA (e.g., UE-specific TA pre-compensation) may be based on a TA value. A TA offset threshold may be used in the event-triggered reporting procedure. At least the TA offset threshold may be a value between the current UE-specific TA value and the last successfully reported UE-specific TA value.

[0124] In a quasi-earth fixed scenario or an earth fixed scenario, timing information regarding when a cell ceases service to a given area may be required to support cell reselection operations (e.g., NTN cell reselection operations). A base station (e.g., a cell, a network) may transmit system information including timing information regarding when a cell ceases service to a given area to a terminal. The system information may be broadcast. The point in time when a cell ceases service to a given area may refer to a cell downtime. The broadcasting operation of information regarding the cell downtime using a SIB may be applicable to a quasi-earth fixed cell. In other words, the broadcasting operation of information regarding the cell downtime using a SIB may not be applicable to a mobile cell. In a quasi-earth fixed scenario, timing information regarding when a cell ceases service (e.g., a cell downtime) may be used to determine when measurements for neighboring cells are performed. In a quasi-earth fixed scenario (e.g., a quasi-earth fixed cell), system information including information about the reference location of a cell (e.g., a serving cell and / or a neighboring cell) may be broadcast. The reference location may be a cell center.

[0125] In a quasi-earth fixed scenario, a terminal can start measuring neighboring cells before the serving cell stops serving the current area. In a quasi-earth fixed scenario, information about the cell downtime (e.g., timing information) broadcasted can indicate the time when the cell does not cover the current area. "The cell does not cover the current area" can mean "the cell does not provide service for the current area." In a quasi-earth fixed scenario, it can be configured that the terminal performs a measurement operation on a neighboring cell (e.g., an adjacent cell) before the time when the serving cell stops broadcasting (e.g., the cell downtime, the time when the cell stops covering the current area). The exact time when the terminal performs the measurement operation on the neighboring cell can be determined depending on the implementation of the terminal.

[0126] Figures 9a to 9d are conceptual diagrams illustrating various forms of a three-dimensional space communication system.

[0127] Referring to FIGS. 9A to 9D , a three-dimensional space communication system (e.g., a space communication network) may be designed such that a terminal can perform wireless communication using a device (e.g., a communication node) located in the sky. In the present disclosure, a satellite (e.g., a three-dimensional space device) may refer to a High-Altitude Pseudo Satellite (HPAS) or High Altitude Platform Station, an Unmanned Aerial Vehicle (UAV), an Urban Air Mobility (UAM), etc. A satellite (e.g., a three-dimensional space device) may not be limited to an HPAS, a UAV, and / or a UAM. A satellite may refer to a three-dimensional space device.

[0128] In the embodiment of FIG. 9A, a satellite (920) can relay communication between a terminal (910) and a base station (930). The terminal (910) can be an NTN node (e.g., an NTN terminal). The satellite (920) can be a remote radio head (RRH). The satellite (920) can perform a function of relaying a Uu radio interface signal between the terminal (910) and the base station (930). The NTN gateway can be the base station (930). In the embodiment of FIG. 9A, the satellite (920) can relay a signal between the terminal (910) and the base station (930), and the satellite (920) can operate transparently. In other words, the satellite (920) can be a transparent satellite.

[0129] In the embodiment of FIG. 9B, the satellite (920) can support some or all of the functions of the base station (930). The satellite (920) can perform the functions of a base station or a relay node. The satellite (920) can be a satellite base station, the satellite (920) can directly form (e.g., establish) a Uu link (e.g., a Uu radio interface) with the terminal (910), and the satellite (920) can be a regenerative satellite. In other words, the satellite (920) can support a regeneration operation for a signal.

[0130] In the embodiment of FIG. 9C, a terminal (910) can form (e.g., establish) a Uu link with a relay node (940). The relay node (940) can be located around the terminal, outdoors, indoors, or on the ground. Alternatively, the relay node (940) can be located within a satellite (920). The relay node (940) can be connected to a base station (930) via the satellite (920). The NTN node can be the satellite (920). The base station (930) can be a terrestrial base station. A terrestrial base station can refer to a base station located on the ground. The satellite (920) can relay communication between the relay node (940) and the base station (930). The satellite (920) can be an RRH. The satellite (920) can perform a function of relaying Un radio interface signals between the relay node (940) and the base station (930). The NTN gateway can be the base station (930).

[0131] In the embodiment of FIG. 9D, a terminal (910) can form (e.g., establish) a Uu link with a relay node (940). The relay node (940) can be located around the terminal, outdoors, indoors, or on the ground. The NTN node can be a base station (930). A satellite (920) can support some or all of the functions of the base station (930). An Un link can be established between the relay node (940) and a satellite (920) that supports the functions(s) of the base station.

[0132] In this disclosure, methods for supporting a reduced capability terminal will be described. A reduced capability terminal may be referred to as a RedCap UE (user equipment). A reduced capability terminal may support HD (half duplex)-FDD (frequency division duplex) operation. A reduced capability terminal supporting HD-FDD operation may be referred to as an HD-FDD RedCap UE, an HD-FDD terminal, or an HD terminal. A reduced capability terminal may access an NTN. In this disclosure, a terminal may be interpreted as a reduced capability terminal or a general terminal (e.g., a legacy terminal) depending on the context.

[0133] Methods for supporting HD-FDD RedCap UE considering NTN environment will be described. Methods for HD-FDD RedCap UE to determine one communication (e.g., one operation) among UL (uplink) communication (e.g., UL transmission operation) and DL (downlink) communication (e.g., DL reception operation) considering NTN environment will be described. Methods for performing one determined communication (e.g., UL communication or DL ​​communication) will be described. Methods for HD-FDD RedCap UE to measure channel state, generate channel state information (CSI), and / or report CSI considering NTN environment will be described. Parameters (e.g., K) that affect the preparation time of DL reception processing of a terminal, the preparation time of UL transmission processing of a terminal, the transmission and reception time of a CSI reference signal, the preparation time of CSI reporting, etc., will be described. offset When the terminal is instructed to change the above-described times, the terminal's operations according to the change will be described. The above-described parameters may refer to NTN parameters.

[0134] In a communication system (e.g., NR communication system, 5G communication system), a base station (e.g., IAB node, relay station) can transmit configuration information of CSI reporting to a terminal or mobile terminal (MT) using time and / or frequency resources. The terminal or MT can receive configuration information of CSI reporting from the base station. In other words, the base station can control CSI reporting of the terminal or MT. A relay station can support some or all of the functions of a base station. A relay station can include an eNB, gNB, a base station, an IAB node, an IAB-DU (distributed unit), an IAB-MT (mobile terminal), a repeater, etc. Alternatively, another term may be used instead of a relay station.

[0135] The terminal may refer to a UE including a mobile equipment (ME) and a USIM (universal mobile telecommunication system (UMTS) subscriber identity module), an ME including an MT and terminal equipment (TE), an MT supporting mobile communication functions, etc. Alternatively, another term may be used instead of the terminal. The CSI may include at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), an SS / PBCH block resource indicator (SSBRI), a layer indicator (LI), a rank indicator (RI), a layer-1 reference resource received power (L1-RSRP), or a layer-1 signal-to-noise and interference ratio (L1-SINR). A terminal may receive from a base station via signaling (e.g., higher layer signaling) N report configurations (e.g., CSI-ReportConfig), M resource configurations (e.g., CSI-ResourceConfig), and / or a trigger configuration including a list of one or more trigger states (e.g., CSI-AperiodicTriggerStateList or CSI-SemiPersistentOnPUSCH-TriggerStateList) for CSI reporting. Each of N and M may be a natural number.

[0136] Each report configuration (e.g., CSI-ReportConfig) may include one or more parameters (e.g., one or more upper layer parameters) defined in Tables 4 through 6 below.

[0137]

[0138]

[0139]

[0140] Each resource configuration (e.g., CSI-ResourceConfig) may include one or more parameters (e.g., one or more upper layer parameters) defined in Tables 7 through 9 below.

[0141]

[0142]

[0143]

[0144] A trigger configuration (e.g., CSI-AperiodicTriggerStateList or CSI-SemiPersistentOnPUSCH-TriggerStateList) may include one or more parameters (e.g., one or more upper layer parameters) defined in Tables 10 and 11 below.

[0145]

[0146]

[0147] The base station may configure the terminal to derive the CQI based on one of the tables 12 to 15 below. In other words, the base station may instruct (e.g., configure) the terminal to use one of the tables 12 to 15 below through signaling. The terminal may derive the CQI based on one of the tables 12 to 15 below based on the configuration of the base station.

[0148]

[0149]

[0150]

[0151]

[0152] A combination of a modulation scheme and a transport block size that satisfies one or more of the conditions below may correspond to one CQI index among the CQI indices in Tables 12 to 15.

[0153] - Condition 1: Combination of modulation method and transport block size (TBS) for PDSCH transmission within CSI reference resource

[0154] - Condition 2: Modulation method is indicated by CQI index

[0155] - Condition 3: When a combination of modulation scheme and TBS is applied to a reference resource (e.g., a CSI reference resource), if the effective channel code rate determined based on the combination of modulation scheme and TBS is closest to the code rate indicated by the CQI index, only the combination consisting of the smallest TBS among the combinations of modulation scheme and TBS is valid.

[0156] If the upper layer parameter timeRestrictionForChannelMeasurements in the reporting configuration is set to notConfigured, the time-domain measurement restriction may not be applied to the channel measurement resource (CMR) of the reporting configuration. In the above-described situation, when the terminal performs channel measurement for calculating CSI (e.g., a CSI value) reported in slot n (e.g., uplink slot n), the terminal may determine (e.g., calculate, derive, derive) the CSI by considering CSI reference resource(s) among the NZP (non-zero power) CSI-RS resource(s) included in the CMR and / or NZP CSI-RS resource(s) located before the resource (e.g., the NZP CSI-RS resource(s) or the CSI reference resource(s)).

[0157] When the upper layer parameter timeRestrictionForChannelMeasurements in the reporting configuration is set to Configured, the time domain measurement restriction may be applied to the CMR of the reporting configuration. In the above situation, when the terminal performs channel measurement for calculating CSI (e.g., a CSI value) reported in slot n (e.g., uplink slot n), the terminal may determine (e.g., calculate, derive, derive) the CSI by considering CSI reference resource(s) among the NZP CSI-RS resource(s) included in the CMR and / or the most recent NZP CSI-RS resource(s) located before the resource (e.g., the NZP CSI-RS resource(s) or the CSI reference resource(s)).

[0158] If the upper layer parameter timeRestrictionForChannelMeasurements in the reporting configuration is set to notConfigured, the time domain measurement restriction may not be applied to the interference measurement resource (IMR) of the reporting configuration. In the above situation, when the terminal performs interference measurement for calculating CSI (e.g., CSI value) reported in slot n (e.g., uplink slot n), the terminal may determine (e.g., calculate, derive, derive) the CSI by considering "CSI reference resource(s) among the CSI-IM resource(s) and / or NZP CSI-RS resource(s) included in the IMR" and / or "resource(s) located before the resource (e.g., IMR, CSI-IM resource(s), NZP CSI-RS resource(s), or CSI reference resource(s))".

[0159] When the upper layer parameter timeRestrictionForChannelMeasurements in the reporting configuration is set to Configured, the time domain measurement restriction may be applied to the IMR of the reporting configuration. In the above situation, when the terminal performs interference measurement for calculating CSI (e.g., a CSI value) reported in slot n (e.g., uplink slot n), the terminal may determine (e.g., calculate, derive, derive) the CSI by considering "CSI reference resource(s) among the CSI-IM resource(s) and / or NZP CSI-RS resource(s) included in the IMR" and / or "the most recent resource(s) located before the resource (e.g., the IMR, the CSI-IM resource(s), the NZP CSI-RS resource(s), or the CSI reference resource(s))". The most recent resource may mean the most recent occasion.

[0160] In a serving cell, CSI reference resources can be defined as follows:

[0161] - In the frequency domain, a CSI reference resource can be defined as a group of downlink PRBs in a band associated with the derived CSI (e.g., the determined CSI).

[0162] - In the time domain, the CSI reference resource for CSI reported in slot n (e.g., uplink slot n) can be defined as the downlink slot in the following mathematical expression 7.

[0163]

[0164] n in equation 7 CSI_ref , K offset , and can be set (e.g., instructed) to the terminal through signaling of the base station (e.g., upper layer signaling, RRC signaling, MAC CE signaling). The terminal can check the above-described parameter(s) through signaling of the base station. Alternatively, the base station and / or the terminal can set n based on preset rules. CSI_ref , K offset , and can be determined (e.g., derived, deduced). For example, the base station is K offset The RRC settings and / or MAC CE including the above can be transmitted to the terminal.

[0165] When a single CSI-RS resource or a single SSB resource is set as CMR for periodic CSI reporting or semi-persistent CSI reporting, the terminal shall n CSI_ref 4· Among the integers above, the minimum value indicating a valid uplink slot can be determined. When multiple CSI-RS resources or multiple SSB resources are set to CMR for periodic CSI reporting or semi-persistent CSI reporting, the terminal may set n CSI_ref 5· Among the integers above, the minimum value indicating a valid uplink slot can be determined.

[0166] For aperiodic CSI reporting, which is instructed to be transmitted in the same slot in which a CSI request based on DCI is received, the terminal determines that the slot in which the CSI request is received is a valid downlink slot. CSI_ref For aperiodic CSI reports other than the aperiodic CSI reports described above, the terminal determines the smallest integer n that satisfies a separately defined delay requirement (Z'). CSI_ref can be determined. The terminal can perform channel measurement or interference measurement based on periodic or semi-persistent CSI-RS / CSI-IM / SSB, and transmit an aperiodic CSI report to the base station based on the result of the channel measurement or the interference measurement. In the above-described situation, if the last symbol (e.g., the last OFDM symbol) of the periodic or semi-persistent CSI-RS / CSI-IM / SSB resource is within the delay requirement (Z') based on the first symbol (e.g., the first OFDM symbol) on which the aperiodic CSI report is transmitted, the terminal may not perform a measurement operation for the periodic or semi-persistent CSI-RS / CSI-IM / SSB resource. In other words, if the number of symbols belonging to the interval from the last symbol of the periodic or semi-persistent CSI-RS / CSI-IM / SSB resource to the first symbol in which an aperiodic CSI report is transmitted is not greater than Z' symbols, the terminal may not perform a measurement operation for the periodic or semi-persistent CSI-RS / CSI-IM / SSB resource. Z' may be a natural number.

[0167] A slot satisfying the condition(s) within a serving cell may be considered (e.g., deemed, determined) as a valid downlink slot. If there is no valid downlink slot for the CSI reference resource of the CSI reporting configuration within the serving cell, the UE may omit CSI reporting for the serving cell in slot n' (e.g., uplink slot n').

[0168] If the terminal is configured to report CQI, the terminal may assume the following item(s) to derive (e.g., derive, determine) the CQI, RI, and / or PMI within the CSI reference resource. Alternatively, the item(s) for deriving (e.g., derive, determine) the CQI, RI, and / or PMI may not be limited to the following item(s).

[0169] □ Item 1: The first two symbols (e.g., the first two OFDM symbols) are used to transmit control signals.

[0170] □ Item 2: The number of symbols for PDSCH and DMRS is 12.

[0171] □ Item 3: BWP, SCS, and / or CP lengths equal to the BWP, SCS (subcarrier spacing), and / or CP lengths set for PDSCH reception.

[0172] □ Item 4: Same bandwidth as the bandwidth set for CQI reporting

[0173] □ Item 5: No RE usage for SSB, NZP CSI-RS, and / or ZP CSI-RS

[0174] □ Item 6: RV (redundancy version) 0

[0175] □ Item 7: The ratio between PDSCH EPRE (energy per resource element) and CSI-RS EPRE is based on the upper layer setting value (e.g., Pc, powerControlOffset).

[0176] □ Item 8: For DMRS patterns, maxLength and / or dmrs-AdditionalPosition in DMRS-DownlinkConfig are referenced.

[0177] □ Item 9: DMRS does not exist within the PDSCH symbol.

[0178] □ Item 10: The size of PRB bundling is assumed to be 2 PRBs.

[0179] □ Item 11: The PDSCH signal transmitted at the PDSCH antenna ports [1000, ..., 1000+v-1] for v layers satisfies the relationship of Equation 8 with the signal transmitted at the CSI-RS antenna ports [3000, ..., 3000+P-1]. W(i) is the precoding matrix indicated by the PMI (e.g., precoding matrix0,P) and is the number of CSI-RS ports in the CSI-RS resource. v and P are each natural numbers.

[0180] Each CSI report may have a priority (e.g., a priority value) based on the rule(s) described in Tables 16 to 18 below. A lower value may have a higher priority, and a higher value may have a lower priority. If different CSI reports collide, the different CSI reports may be merged into a single CSI report according to the configuration of the base station. Alternatively, one CSI report may be selected from among the different CSI reports, and the remaining CSI reports may be dropped. In the CSI report selection process, the CSI content may be adjusted according to the CSI payload with reference to the priority value. In the CSI report selection process, a CSI report may be selected based on the priority value.

[0181]

[0182]

[0183]

[0184] A terminal may transmit a terminal capability report (e.g., a UE capability report) to a base station. The base station may receive the terminal capability report from the terminal. The terminal capability information may include the maximum number of CSI calculations that the terminal can perform simultaneously.

[0185] When L CPUs (CSI processing units) in a terminal are occupied and the terminal starts calculating N CSI reports, the terminal may not perform updates on NM lower CSI reports having lower priorities based on the priority description. The state in which L CPUs are occupied may mean a state in which L CPUs are used for calculating CSI reports. L, N, and M may each be a natural number. M may be the largest positive number among values ​​that satisfy the following mathematical expression 8 and are greater than or equal to 0 and less than or equal to N. may be the number of CPUs used for the nth CSI calculation.

[0186]

[0187] The number of CPUs required for each CSI report can be determined based on Tables 19 to 23 below.

[0188]

[0189]

[0190]

[0191]

[0192]

[0193] Various factors including the elements below can be assumed to have specific values, and the CSI reported in slot n (e.g., uplink slot n) can be derived (or determined, derived) based on the assumptions. Alternatively, the CSI reported in slot n can be determined by considering the specific values. In the present disclosure, the elements assumed by the terminal to generate CSI can be referred to as CSI components. CSI components can be defined as shown in Table 24 below. CSI components may not be limited to the elements listed in Table 24 below. In other words, CSI components can include various elements other than the elements listed in Table 24 below.

[0194]

[0195] A communication system (e.g., an LTE communication system, a NR communication system, a 6G communication system) may include different types of terminals capable of transmitting and receiving various types of wireless signals. A terminal may report its capabilities (e.g., capability characteristics) to a base station based on an initial access procedure (e.g., an IA (Initial Access) procedure) and / or a terminal capability reporting procedure. The base station may receive information about the capabilities of the terminal from the terminal.

[0196] In a communication system (e.g., an LTE communication system, a NR communication system, a 6G communication system), a terminal may transmit information indicating that the terminal is a low-end terminal (e.g., a RedCap (reduced capability) UE) to a base station during at least one of an initial access procedure or a terminal capability reporting procedure. The base station may confirm the type of the terminal (e.g., a low-end terminal) based on the information received from the terminal.

[0197] Low-end terminals may include HD (half-duplex) FDD terminals that do not support simultaneous operation for UL communication (e.g., UL transmission) and DL communication (e.g., DL reception) in a paired spectrum of a communication system supporting FDD (frequency division duplex).

[0198] When uplink transmission is allocated to uplink frequency resources and downlink reception is allocated to downlink frequency resources within the same time interval, an HD-FDD terminal (e.g., a low-performance terminal) can determine an operation to be performed by the HD-FDD terminal and an operation not to be performed by the HD-FDD terminal based on a priority rule.

[0199] When the operation of an HD-FDD terminal changes from an uplink transmission operation to a downlink reception operation or when the operation of an HD-FDD terminal changes from a downlink reception operation to an uplink transmission operation, a guard period (GP) may be applied in the time resources between the operations to allow for a change (e.g., switching) between the operations.

[0200] Figure 10a is a conceptual diagram illustrating embodiments of HD GP (half-duplex guard period) according to terminal capabilities.

[0201] Referring to FIG. 10A, a GP (e.g., HD GP) may be configured with one or more OFDM symbols (e.g., within a period of several microseconds, within a period of several tens of microseconds) based on the capabilities of the terminal. In FIG. 10A, the GP may be a Type A HD-FDD GP.

[0202] Figure 10b is a conceptual diagram illustrating embodiments of HD GP according to terminal capabilities.

[0203] Referring to FIG. 10b, a GP (e.g., HD GP) may be configured with one or more slots (e.g., a period within several milliseconds, a period within tens of milliseconds) based on the capabilities of the terminal. In FIG. 10b, the GP may be a Type B HD-FDD GP.

[0204] Within a time interval corresponding to GP, it can be ensured that the terminal (1010) does not perform an uplink transmission operation to the base station (1020) and / or a downlink reception operation to the base station (1020).

[0205] A method for determining UL / DL operations for an HD-FDD terminal supported by a communication system may be based on Tables 25 to 28 below. The method for determining UL / DL operations for an HD-FDD terminal may not be limited to the embodiments defined in Tables 25 to 28 below. According to the method for determining UL / DL operations, one operation may be selected from an uplink transmission operation (e.g., UL communication) and a downlink reception operation (e.g., DL communication). The UL / DL operations for an HD-FDD terminal may be determined based on an HD-FDD priority rule. In the present disclosure, an HD-FDD terminal may be referred to as an HD terminal or an HD UE for convenience. The HD-FDD priority rule may be referred to as an HD priority rule. Alternatively, the HD-FDD priority rule may be referred to as a priority rule for convenience.

[0206] An HD terminal may not be able to simultaneously perform uplink transmission and downlink reception operations in a paired spectrum within a serving cell. The HD terminal may predict downlink reception in a symbol set and may not perform an uplink transmission operation in the symbol set. The symbol set may include one or more symbols. For example, the HD terminal may receive at least one of a PDCCH, a PDSCH, a CSI-RS, or a DL-PRS (positioning reference signal) in a symbol set configured by higher layer parameter(s). In other words, the symbol set for the downlink reception operation may be configured for the terminal based on higher layer signaling of the base station (e.g., higher layer parameter(s)). If transmission of at least one of a PUCCH, a PUSCH, a PRACH, or an SRS within the symbol set is not instructed to the HD terminal based on the DCI, the terminal may receive a downlink signal / channel within the symbol set. If at least one transmission among PUCCH, PUSCH, PRACH, or SRS within a symbol set is instructed to the HD terminal based on the DCI, the terminal may not receive a downlink signal / channel within the symbol set.

[0207] Higher layer signaling (e.g., higher layer parameter(s)) of the base station can configure the HD terminal to perform an uplink transmission operation in a symbol set. If a DCI indicating reception of a downlink signal / channel in a symbol set is not received, the HD terminal can perform an uplink transmission operation in the symbol set.

[0208] The first symbol of the symbol set is a preset time (e.g., T) from the last symbol of the PDCCH reception (e.g., DCI reception). proc,2) occurs within the preset time (e.g., T), the HD terminal may not cancel the uplink transmission in the symbol set. proc,2 ) can be determined based on the processing capability of the HD terminal. Or, a preset time (e.g., T proc,2 ) may be determined based on “factors other than the processing capability of the HD terminal” or “factors other than the processing capability of the HD terminal and other factors.”

[0209] The HD terminal may select one operation from among the uplink transmission operation and the downlink reception operation based on Tables 25 to 28 below. The operation of the HD terminal may not be limited to the embodiments specified in Tables 25 to 28 below.

[0210]

[0211]

[0212]

[0213]

[0214] In Tables 25 to 28, the transition times (e.g., N Tx-Rx and N Rx-Tx ) can be set for each frequency range (e.g., FR1 (frequency range 1) or FR2 (frequency range 2)). The transition time can be defined as shown in Table 29 below.

[0215]

[0216] In a communication system supporting at least one of carrier aggregation (CA), dual connectivity (DC), or multi-connectivity (MC), a method for determining multi-carrier transmission and reception operations for a terminal that does not support simultaneous transmission and reception operations may be supported. The simultaneous transmission and reception operations may mean operations of simultaneously performing uplink communication and downlink communication in the same time interval. The multi-carrier transmission and reception operations may be determined based on a multi-carrier priority rule. Table 30 below may define a guard period (GP) for an HD terminal supporting HD-FDD, HD-CA, and / or HD-DC. The GP may not be limited to the embodiments described in Table 30 below. The GP may be N defined in Table 29. Tx-Rx Or N Rx-Tx It can be determined based on at least one of the following.

[0217]

[0218] An uplink priority, a downlink priority, and / or a GP for an HD terminal that does not support simultaneous transmission and reception operations in a communication system may be determined. The uplink priority, the downlink priority, and / or the GP for the HD terminal may be determined based on the embodiments specified in Tables 25 to 30. The embodiments of Tables 25 to 30 may not take into account an NTN environment. In other words, Tables 25 to 30 may specify a method for determining an uplink priority, a downlink priority, and / or a GP for an HD terminal that does not take into account an NTN environment.

[0219] Satellite-based communications can be performed in NTN, and long propagation delays may exist in NTN. Scheduling offsets, TAs, PDSCH / PUSCH / CSI processing times, and / or other components may vary in NTN environments. Methods for supporting HD terminals performing uplink and downlink communications in NTN environments may be necessary. When HD terminals determine uplink priorities, downlink priorities, and / or GPs in NTN environments, the components of the NTN environment need to be taken into consideration.

[0220] In this disclosure, a terminal that does not support simultaneous transmission and reception may be referred to as an HD terminal. Alternatively, a terminal that cannot perform simultaneous transmission and reception may be referred to by a different term. Embodiments of this disclosure can be applied identically or similarly to terminals that support simultaneous transmission and reception.

[0221] CSI reporting method for HD terminals in NTN environment

[0222] In an NTN environment, CSI reporting that considers the characteristics of HD terminals may be necessary. An NTN HD terminal may refer to an HD terminal in an NTN environment. In this disclosure, a terminal may refer to an HD terminal, an NTN HD terminal, or a general terminal, depending on the context.

[0223] Figure 11a is a conceptual diagram illustrating CSI reporting methods of an NTN HD terminal.

[0224] Referring to FIG. 11A, a base station can configure (e.g., allocate) at least one resource among CMR or IMR as a resource (1110) for channel state measurement to a terminal (e.g., an HD terminal, an NTN HD terminal) through signaling. An uplink resource (1130) through which a CSI report is transmitted can include at least one among PUCCH or PUSCH. In other words, the terminal can generate a CSI report based on channel state measurement and transmit the CSI report to the base station through at least one among PUCCH or PUSCH. The terminal can determine a CSI reference resource (1120). In the frequency domain, the CSI reference resource (1120) can be defined as a downlink PRB group of a band through which the CSI report is transmitted. In the time domain, the CSI reference resource (1120) can be determined as a previous time resource that is preset based on an uplink slot n' through which the CSI report is transmitted.

[0225] The terminal can perform channel measurement on a resource (1110) for channel state measurement and generate (e.g., calculate) CSI based on the channel measurement results. The time required to generate (e.g., calculate) CSI may be the time from the resource (1110) for channel state measurement to the uplink resource (1130) to which the CSI report is transmitted.

[0226] For example, a terminal may occupy a CPU (CSI processing unit) while generating (e.g., calculating) CSI for CSI reporting. The terminal may include one or more CPUs. The number of CSIs that can be simultaneously calculated (e.g., generated) may be determined based on the number of CPUs included in the terminal. The terminal may transmit terminal capability information including the number of CSIs that can be simultaneously calculated to the base station. The base station may determine the number of CSIs that can be simultaneously calculated in the terminal based on the terminal capability information received from the terminal. The CPU occupancy time may be the time required for the terminal to calculate CSI (e.g., generate CSI). The CPU occupancy time may be the time from a resource (1110) for channel state measurement to an uplink resource (1130) to which a CSI report is transmitted. The CPU occupancy time may be referred to as a CPU calculation time or a CPU generation time.

[0227] In the embodiment of FIG. 11A, the CPU occupancy time (1140) may be the time from the resource (1110) where the channel status was most recently measured for CSI reporting to the uplink resource (1130) where the CSI report is transmitted. The resource (1110) where the channel status was most recently measured for CSI reporting may be the CSI reference resource (1120) or a resource preceding the CSI reference resource (1120). The resource (1110) for channel status measurement may be the most recent CSI-RS occasion preceding the CSI reference resource (1120). Alternatively, the resource (1110) for channel status measurement may be a CSI-IM resource preceding the CSI reference resource (1120).

[0228] Figure 11b is a conceptual diagram illustrating CSI reporting methods of NTN HD terminals.

[0229] Referring to FIG. 11b, when CSI reporting is performed in an uplink resource (1130) of slot n in an NTN environment, the CSI reference resource (1120) for the CSI reporting may be determined as a slot determined based on the above-described mathematical expression 7 or the most recent valid DL slot prior to the slot.

[0230] A base station can allocate different CSI-RS resources to a terminal (e.g., an HD terminal, an NTN HD terminal) in the time domain, and can instruct the terminal to report an optimal CSI-RS resource among the different CSI-RS resources to the base station. The terminal can transmit information on the optimal CSI-RS resource to the base station based on the instruction of the base station. The information on the optimal CSI-RS resource can be a CSI-RS resource indicator (CRI). As another example, the base station can transmit a CSI reporting configuration to the terminal. The CSI reporting configuration can include a time-domain measurement restriction (TDMR). If the CSI reporting configuration and / or TDMR are not configured in the terminal, the terminal can generate CSI for CSI reporting by referring to at least one of a plurality of CSI-RS occasions or a plurality of CSI-IM occasions.

[0231] In the above mathematical expression 7, the slot of the CSI reference resource is K offset can be determined based on K offset is a cell-specific offset set by RRC parameters (e.g., cell-specific K offset ) and a terminal-specific offset (e.g., UE-specific K) allocated based on MAC CE. offset ) can be determined based on the difference between them. For example, K offset In this large case (e.g. K offsetIn the case where this is several ms (milliseconds) or tens of ms or more), at least one of the CSI-RS occasion(s) or CSI-IM occasion(s), which are resources (1110) for channel state measurement, may be set to be far away from the uplink resource (1130) to which the CSI report is transmitted.

[0232] Based on the HD priority rules specified in Tables 25 to 30, an HD terminal may not receive a downlink signal / channel in a CMR and / or IMR within a channel state measurement resource (1110). In this case, the time difference between a CSI report and a channel state measurement associated with the CSI report may further increase. The channel state measurement resource (1110) may refer to a resource on which channel state measurement is performed. The channel state measurement resource (1110) may be referred to as a measurement resource. In the present disclosure, the HD priority may be referred to as a priority for convenience.

[0233] In an NTN environment, an HD terminal may perform CSI reporting considering the loss of validity of CSI reporting due to the aforementioned time difference. If an NTN HD terminal fails to receive a downlink signal / channel in a CMR and / or IMR within a valid channel state measurement resource (1110) prior to a CSI reference resource (1120) based on the HD priority rule, the NTN HD terminal may omit CSI reporting. In other words, if the time difference between the time of channel state measurement and the time of CSI reporting is large, the HD terminal may determine that the channel state measurement does not reflect the actual channel state and may omit CSI reporting.

[0234] K offset If this preset value is greater than the HD terminal can skip CSI reporting. Or K offsetIf the time or time resource index calculated (e.g., determined) based on is greater than a preset value, the HD terminal may omit CSI reporting. The preset value may be a value indicated by a higher layer parameter. Alternatively, the preset value may be a value determined by the HD terminal (e.g., an NTN HD terminal). Based on Equation 7, K offset In this case, the time difference between the CSI reference resource (1120) and the uplink resource (1130) including the CSI report may increase. In this case, the difference between the time of channel state measurement and the time of CSI report may increase, and the CSI report may not reflect the actual channel state. In other words, K offset In this large case, the channel state measurement may not reflect the actual channel state. offset If it is greater than this preset value, CSI reporting may be omitted.

[0235] CSI report K offset (or K offset If the time or time resource index determined based on K is less than a preset value, it may be omitted. offset (or K offset If the time or time resource index determined based on the time or time resource index) is less than a preset value, the DL-UL pattern alignment may not be maintained in the FDD-HD operation of the NTN HD terminal. Therefore, the NTN HD terminal may omit CSI reporting.

[0236] In other words, K offset (or K offset Based on the difference between the time or time resource index determined based on the time or time resource index) and a preset value, whether to omit CSI reporting can be determined.

[0237] If an NTN HD terminal fails to perform a valid channel state measurement based on the HD priority rules specified in Tables 25 to 30, the NTN HD terminal may skip CSI reporting. In other words, if an NTN HD terminal fails to receive a downlink signal / channel in a valid CMR and / or a valid IMR based on the HD priority rules specified in Tables 25 to 30, the NTN HD terminal may skip CSI reporting.

[0238] If the NTN HD terminal fails to perform channel state measurement within a preset time from an uplink resource to which a CSI report is transmitted based on the HD priority rules specified in Tables 25 to 30, the NTN HD terminal may skip the CSI report. In other words, if the NTN HD terminal fails to receive a downlink signal / channel in a valid CMR and / or a valid IMR within a preset time from an uplink resource to which a CSI report is transmitted based on the HD priority rules specified in Tables 25 to 30, the NTN HD terminal may skip the CSI report.

[0239] Figure 12 is a conceptual diagram illustrating CSI reporting methods of NTN HD terminals.

[0240] Referring to FIG. 12, a base station can allocate (e.g., configure) at least one resource among CMR or IMR as a channel state measurement resource (1210) to a terminal (e.g., an HD terminal, an NTN HD terminal) through signaling. An uplink resource (1230) through which a CSI report is transmitted can include at least one among PUCCH or PUSCH. In other words, the terminal can generate CSI based on channel state measurement and transmit the CSI (e.g., a CSI report) to the base station through at least one among PUCCH or PUSCH. The terminal can determine a CSI reference resource (1220). In the frequency domain, the CSI reference resource (1220) can be defined as a downlink PRB group of a band through which the CSI report is transmitted. In the time domain, the CSI reference resource (1220) can be determined as a previous time resource that is preset based on an uplink slot n' through which the CSI report is transmitted.

[0241] A terminal can perform channel measurement on a channel state measurement resource (1210) and generate (e.g., calculate) CSI based on the channel measurement result. The time required to generate (e.g., calculate) CSI may be the time from the channel state measurement resource (1210) to the uplink resource (1230) to which the CSI report is transmitted. For example, the terminal may occupy a CPU while generating (e.g., calculating) CSI for a CSI report. The terminal may include one or more CPUs. The number of CSIs that can be calculated (e.g., generated) simultaneously may be determined based on the number of CPUs included in the terminal. The terminal may transmit terminal capability information including the number of CSIs that can be calculated simultaneously to the base station. The base station may confirm the number of CSIs that can be calculated simultaneously in the terminal based on the terminal capability information received from the terminal. The CPU occupancy time may be the time required for the terminal to calculate (e.g., generate) CSI. The CPU occupancy time may be the time from the channel state measurement resource (1210) to the uplink resource (1230) where the CSI report is transmitted. The CPU occupancy time may be referred to as CPU calculation time or CPU generation time.

[0242] The number of CSIs that can be calculated simultaneously in an NTN HD terminal, which is a low-spec terminal (e.g., a RedCap terminal), may be smaller than the number of CSIs that can be calculated simultaneously in a conventional terminal (e.g., a general terminal). For example, the number of CSIs that can be calculated simultaneously in an NTN HD terminal may be 1. The number of CSIs that can be calculated simultaneously in an NTN HD terminal may be small, and the NTN HD terminal may continuously occupy the CPU due to a problem with CSI calculation. In this case, the NTN HD terminal may not be able to transmit another CSI report. The number of CSIs that can be calculated simultaneously in an conventional terminal may be multiple. The conventional terminal may use the CPU that is not occupied. Since the number of CSIs that can be calculated simultaneously in an NTN HD terminal is small, a problem with CSI reporting may occur. Methods to solve the problem with CSI reporting may be needed.

[0243] The CPU occupancy time may be the time from the most recently measured channel state measurement resource (1210) for CSI reporting to the uplink resource (1230) to which the CSI report is transmitted. The most recently measured channel state measurement resource (1210) for CSI reporting may be the CSI reference resource (1220) or a resource preceding the CSI reference resource (1220). For example, the channel state measurement resource (1210) may be the most recent CSI-RS occasion preceding the CSI reference resource (1220). For another example, the channel state measurement resource (1210) may be a CSI-IM resource preceding the CSI reference resource (1220).

[0244] In an NTN environment, when a CSI report is transmitted in an uplink resource (1230) of slot n, the CSI reference resource (1220) for the CSI report may be determined as a slot determined based on the above-described mathematical expression 7 or as the most recent valid DL slot existing before the slot.

[0245] A base station can allocate different CSI-RS resources to a terminal (e.g., an HD terminal, an NTN HD terminal) through signaling in the time domain. The base station can instruct the terminal to report an optimal CSI-RS resource among the different CSI-RS resources to the base station. The terminal can transmit information on the optimal CSI-RS resource to the base station based on the instruction of the base station. The information on the optimal CSI-RS resource may be a CRI. As another example, the base station can transmit a CSI reporting configuration to the terminal. The CSI reporting configuration may include a TDMR. If the CSI reporting configuration and / or the TDMR are not configured in the terminal, the terminal may generate CSI for CSI reporting by referring to at least one of a plurality of CSI-RS occasions or a plurality of CSI-IM occasions.

[0246] In the above mathematical expression 7, the slot of the CSI reference resource is K offset can be determined based on K offset is a cell-specific offset set by RRC parameters (e.g., cell-specific K offset ) and a terminal-specific offset (e.g., UE-specific K) allocated based on MAC CE. offset ) can be determined based on the difference between them. For example, K offset In this large case (e.g. K offset In the case where the time is several ms or tens of ms or more), at least one of the CSI-RS occasion(s) or CSI-IM occasion(s) which are channel state measurement resources (1210) may be set to be far from the uplink resource (1230) to which the CSI report is transmitted.

[0247] Based on the HD priority rules specified in Tables 25 to 30, the HD terminal may not receive downlink signals / channels in the CMR and / or IMR within the channel state measurement resource (1210). In this case, the time difference between the CSI report and the channel state measurement associated with the CSI report may further increase.

[0248] In an NTN environment, a base station and / or a terminal (e.g., an HD terminal, an NTN HD terminal) can manage the CPU occupancy of the terminal so that it does not exceed the terminal capability. Based on the embodiments specified in Tables 25 to 30, in the embodiment of FIG. 12, a channel state measurement resource (1240) for which a terminal has not performed a downlink reception operation based on an HD priority rule can be excluded from the CPU occupancy time (1250) of the terminal. A CSI report can be generated based on a channel state measured in a channel state measurement resource (1210) at the same time as a CSI reference resource (1220) or in a channel state measurement resource (1210) prior to the CSI reference resource (1220), and the CSI report can be transmitted via an uplink resource (1230). At least one channel state measurement information can be accumulated based on the channel state measurement resource (1210), and the at least one channel state measurement information can be included in a CSI report. A terminal (e.g., an HD terminal, an NTN HD terminal) may not be able to perform downlink reception operations at certain times based on HD priority rules. In this case, channel state measurements performed based on downlink reception may be omitted (or dropped).

[0249] The CPU occupancy time may be the time from the most recently measured channel state measurement resource to the uplink resource where the CSI report is transmitted. In the last channel state measurement resource (1240) illustrated in FIG. 12, the terminal may not be able to perform a downlink reception operation based on the HD priority rule. In this case, the last channel state measurement resource (1240) may be excluded from the CPU occupancy time (1250). The CPU occupancy time (1250) may be determined as the time from the channel state measurement resource before the last channel state measurement resource (1240) to the uplink resource where the CSI report is transmitted. Alternatively, even if the downlink reception operation of the terminal is restricted by the HD priority rule in the last channel state measurement resource (1240), if the terminal measures the channel state in the last channel state measurement resource (1240), the CPU occupancy time (1250) may be determined based on the last channel state measurement resource (1240).

[0250] Figure 13 is a conceptual diagram illustrating CSI reporting methods of NTN HD terminals.

[0251] Referring to FIG. 13, a base station can allocate (e.g., configure) at least one resource among CMR or IMR as a channel state measurement resource (1310) to a terminal (e.g., an HD terminal, an NTN HD terminal) through signaling. An uplink resource (1330) through which a CSI report is transmitted can include at least one among PUCCH or PUSCH. In other words, the terminal can generate CSI based on channel state measurement and transmit the CSI (e.g., a CSI report) to the base station through at least one among PUCCH or PUSCH. The terminal can determine a CSI reference resource (1320). In the frequency domain, the CSI reference resource (1320) can be defined as a downlink PRB group of a band through which the CSI report is transmitted. In the time domain, the CSI reference resource (1320) can be determined as a previous time resource that is preset based on an uplink slot n' through which the CSI report is transmitted.

[0252] A terminal can perform channel measurement on a channel state measurement resource (1310) and generate (e.g., calculate) CSI based on the channel measurement result. The time required to generate (e.g., calculate) CSI may be the time from the channel state measurement resource (1310) to the uplink resource (1330) to which the CSI report is transmitted. For example, the terminal may occupy a CPU while generating (e.g., calculating) CSI for a CSI report. The terminal may include one or more CPUs. The number of CSIs that can be calculated (e.g., generated) simultaneously may be determined based on the number of CPUs included in the terminal. The terminal may transmit terminal capability information including the number of CSIs that can be calculated simultaneously to the base station. The base station may determine the number of CSIs that can be calculated simultaneously in the terminal based on the terminal capability information received from the terminal. The CPU occupancy time may be the time required for the terminal to calculate (e.g., generate) CSI. The CPU occupancy time may be the time from the channel state measurement resource (1310) to the uplink resource (1330) where the CSI report is transmitted. The CPU occupancy time may be referred to as CPU calculation time or CPU generation time.

[0253] The CPU occupancy time may be the time from the most recently measured channel state measurement resource (1310) for CSI reporting to the uplink resource (1330) to which the CSI report is transmitted. The most recently measured channel state measurement resource (1310) for CSI reporting may be the CSI reference resource (1320) or a resource preceding the CSI reference resource (1320). For example, the channel state measurement resource (1310) may be the most recent CSI-RS occasion preceding the CSI reference resource (1320). For another example, the channel state measurement resource (1310) may be a CSI-IM resource preceding the CSI reference resource (1320).

[0254] In an NTN environment, when a CSI report is transmitted in an uplink resource (1330) of slot n, the CSI reference resource (1320) for the CSI report may be determined as a slot determined based on the above-described mathematical expression 7 or as the most recent valid DL slot existing before the slot.

[0255] A base station can allocate different CSI-RS resources to a terminal (e.g., an HD terminal, an NTN HD terminal) through signaling in the time domain. The base station can instruct the terminal to report an optimal CSI-RS resource among the different CSI-RS resources to the base station. The terminal can transmit information on the optimal CSI-RS resource to the base station based on the instruction of the base station. The information on the optimal CSI-RS resource may be a CRI. As another example, the base station can transmit a CSI reporting configuration to the terminal. The CSI reporting configuration may include a TDMR. If the CSI reporting configuration and / or the TDMR are not configured in the terminal, the terminal may generate CSI for CSI reporting by referring to at least one of a plurality of CSI-RS occasions or a plurality of CSI-IM occasions.

[0256] In the above mathematical expression 7, the slot of the CSI reference resource is K offset can be determined based on K offset is a cell-specific offset set by RRC parameters (e.g., cell-specific K offset ) and a terminal-specific offset (e.g., UE-specific K) allocated based on MAC CE. offset ) can be determined based on the difference between them. For example, K offset In this large case (e.g. K offsetIn the case where the time is several ms or tens of ms or more), at least one of the CSI-RS occasion(s) or CSI-IM occasion(s) which are channel state measurement resources (1310) may be set to be far from the uplink resource (1330) to which the CSI report is transmitted.

[0257] Based on the HD priority rules specified in Tables 25 to 30, an HD terminal may not receive downlink signals / channels in the CMR and / or IMR within the channel state measurement resource (1310). In this case, the time difference between a CSI report and the channel state measurement associated with the CSI report may further increase.

[0258] Based on the embodiments specified in Tables 25 to 30, in the embodiment of FIG. 13, based on the HD priority rule, a terminal (e.g., an HD terminal, an NTN HD terminal) may not transmit a CSI report on the uplink resource (1340). In this case, the uplink resource (1340) may be canceled. Accordingly, the base station may not receive the CSI report from the terminal. Due to the cancellation of the uplink resource (1340), the CSI report may not be performed. There would be no reason for the terminal to continue occupying the CPU for the CSI report from the time it decides to cancel the uplink resource (1340). If the terminal decides not to perform uplink transmission on the uplink resource (1340) including the CSI report, the terminal may cancel the CPU occupation for the CSI report from the time it decides not to perform the uplink transmission.

[0259] For another example, if a terminal determines not to perform uplink transmission in an uplink resource (1340) including a CSI report, the terminal may cancel CPU occupancy for the CSI report after an offset from the time at which the terminal determines not to perform the uplink transmission. The offset may be determined by considering the cancellation processing time of the CSI report and / or another time. The offset may be set based on a unit of symbol (e.g., OFDM symbol), slot, or time (e.g., ms). The offset may be a value set by a higher layer parameter or a predetermined value.

[0260] A terminal can report information (e.g., capability information) about the number of CPUs supported by the terminal to a network (e.g., a base station). Information about the number of CPUs can be indicated by a higher layer parameter, simultaneousCSI-ReportsPerCC. In other words, the number of CSIs that can be reported simultaneously per CC (component carrier) can be indicated (e.g., set) by a higher layer parameter (e.g., simultaneousCSI-ReportsPerCC). Alternatively, the number of CSIs that can be reported simultaneously can be indicated by another parameter. The number of CSIs that a terminal can report simultaneously can be the same as the number of CPUs that the terminal supports. For example, the number of CPUs that a terminal (e.g., a low-end terminal) supports per CC can be 1. Alternatively, the number of CSIs that a terminal (e.g., a low-end terminal) can report simultaneously per CC can be more than 1.

[0261] The CPU occupancy time can be determined based on the start time of the CPU occupancy and the end time of the CPU occupancy. If the CSI report is performed based on a CSI-ReportConfig that includes a ReportQuantity that is not set to none, the CPU can be occupied based on symbols (e.g., OFDM symbols). Each of ReportQuantity and CSI-ReportConfig can be a higher layer parameter. For example, periodic or semi-persistent CSI reporting can occupy the CPU starting from the first symbol of each CSI-RS / CSI-IM / SSB resource or the earliest resource among the associated CSI-RS / CSI-IM resources. In other words, the first symbol of the earliest resource can be the start time of the CPU occupancy.

[0262] For CSI-RS / CSI-IM / SSB occasions that are not later than the corresponding CSI reference resource for channel measurement or interference measurement, the CPU may be occupied until the last symbol of the PUSCH / PUCCH containing the CSI report. In other words, the last symbol of the PUSCH / PUCCH containing the CSI report may be the end time of CPU occupancy.

[0263] An aperiodic CSI report may occupy the CPU during the time from the first symbol following the PDCCH that triggers the aperiodic CSI report to the last symbol of the PUSCH scheduled for transmission of the aperiodic CSI report. If the PDCCH reception is associated with two PDCCH candidates for two sets of search spaces, the CPU occupancy time may be determined based on the later PDCCH candidate among the two PDCCH candidates in the time domain. Alternatively, the CPU occupancy time may be determined based on another PDCCH candidate.

[0264] After a PDCCH trigger, a semi-persistent CSI report on the PUSCH may occupy the CPU from the first symbol after the PDCCH to the last symbol of the PUSCH reserved for transmission of the semi-persistent CSI report. If the PDCCH reception is associated with two PDCCH candidates for two sets of search spaces, the CPU occupancy time may be determined based on the later PDCCH candidate among the two PDCCH candidates in the time domain. Alternatively, the CPU occupancy time may be determined based on another PDCCH candidate.

[0265] Semi-persistent CSI reporting on PUSCH based on the upper layer parameter codebookType set to typeII-Doppler-r18 or typeII-Doppler-PortSelection-r18 is K p The CPU can be occupied starting from the first symbol of the last consecutive cycle. The semi-persistent CSI report (or semi-persistent CSI-RS) can occupy the CPU until the last symbol of the PUSCH on which the semi-persistent CSI report is transmitted.

[0266] With respect to the start time and / or end time of CPU occupation, a terminal (e.g., an HD terminal, an NTN HD terminal) may omit at least one reception operation, at least one measurement operation, and / or at least one monitoring operation for CSI-RS / CSI-IM / PDCCH based on a priority rule. Omission of specific operations of the terminal based on the HD priority rule may cause ambiguity problems regarding the start time of CPU occupation, large margin problems regarding CPU occupation in the network, and / or inconsistency problems regarding whether CSI is omitted or not between the network and the terminal. Since the CSI-RS / CSI-IM interval or PDCCH monitoring interval in an NTN environment is longer than the CSI-RS / CSI-IM interval or PDCCH monitoring interval in a TN environment, errors due to the above-described problem(s) may occur in an NTN environment (e.g., an NTN HD terminal).

[0267] If at least one reception operation, at least one measurement operation, and / or at least one monitoring operation for CSI-RS / CSI-IM / SSB is omitted in the NTN HD terminal, CPU occupancy may be released.

[0268] A method for receiving PDSCH without HARQ (hybrid automatic repeat request)-ACK (acknowledgment) for NTN HD terminals

[0269] In an NTN environment, a terminal (e.g., an HD terminal, an NTN HD terminal) can receive a PDSCH without HARQ feedback. In other words, the terminal may not transmit HARQ feedback (e.g., HARQ-ACK) for the PDSCH to the base station. Satellite-based communication can be performed in an NTN. The round trip time (RTT) in an NTN may be tens of ms or more. When a HARQ feedback scheme (e.g., HARQ feedback operation) is used (e.g., enabled), the terminal may transmit a NACK to the base station when reception of the PDSCH fails, and may perform a reception operation for the PDSCH retransmitted from the base station. The HARQ feedback operation may increase the delay, and thus the efficiency of the communication system (e.g., NTN) may be reduced. Considering the above-described issues, in an NTN environment, a base station may support disabling and / or enabling operations (e.g., functions) for a specific HARQ process (e.g., a specific HARQ process identifier). Enabling a HARQ process may mean activating the HARQ process. Disabling a HARQ process may mean deactivating the HARQ process.

[0270] FIG. 14a is a conceptual diagram illustrating embodiments of a PDSCH reception method based on a disabled HARQ process.

[0271] Referring to FIG. 14A, when a specific HARQ process ID is deactivated, the terminal may not receive a PDCCH (1420) that allocates another PDSCH or another slot-aggregated PDSCH that starts earlier than a preset time from the end time of reception (1410) of the most recent PDSCH or the most recent slot-aggregated PDSCH associated with the specific HARQ process ID. The slot-aggregated PDSCH may refer to PDSCHs transmitted in aggregated slots. The preset time is T proc,1 It could be. T proc,1 can be determined based on the mathematical formula 9 below.

[0272]

[0273] In Equation 9, N1 can be based on the processing capability of the terminal. N1 can be determined based on the subcarrier spacing μ. μ can be one of μPDCCH, μPDSCH, or μUL. μ is T proc,1 can be set to a value that has the largest value. μPDCCH can be a subcarrier spacing of a PDCCH that schedules a PDSCH. μPDSCH can be a subcarrier spacing of a scheduled PDSCH. μUL can be a subcarrier spacing of an uplink channel on which HARQ-ACK is transmitted. In Equation 9, T ext can be determined based on channel access behavior in the shared spectrum. T ext may be 0 or another value. The time of mathematical expression 9 and the PDSCH processing procedure may be based on the embodiments specified in Tables 31 to 34 below. Alternatively, the time of mathematical expression 9 and the PDSCH processing procedure may be based on embodiments other than Tables 31 to 34 below.

[0274]

[0275]

[0276]

[0277]

[0278] After the last symbol of a PDSCH associated with a disabled HARQ process, the terminal may not receive a new PDSCH for a preset period of time. In other words, the PDSCH allocation time for HARQ-disabled PDSCH transmission may be guaranteed. The HARQ-disabled PDSCH may be a PDSCH associated with a disabled HARQ process. Improving downlink transmission efficiency in NTN HD terminals may be necessary. Therefore, modifications to the above-described operations may be necessary.

[0279] FIG. 14b is a conceptual diagram illustrating embodiments of a PDSCH reception method based on a disabled HARQ process.

[0280] Referring to FIG. 14b, in the reception procedure of a HARQ-disabled PDSCH, a terminal (e.g., an NTN HD terminal) may not receive all or part of the PDSCH (1430) due to the HD priority rule. For example, in the reception procedure of a slot-aggregated PDSCH, downlink reception operations may be omitted in some of the aggregated slots. Alternatively, the embodiments of the present disclosure may not be limited to the above-described operations. In other words, the terminal may not receive all or part of the PDSCH (1430).

[0281] If the terminal does not receive all or part of the PDSCH according to the HD priority rule, and the terminal receives the PDSCH for a preset time (e.g., T) from the last symbol of the PDSCH, proc,1) may cause unnecessary delay. Considering the above situation, the terminal may receive a new PDSCH within a preset time (e.g., T) from the last reception time (e.g., the last symbol) of the omitted PDSCH (1430). proc,1 ) can also receive a PDCCH (1440) for allocation of a new PDSCH (1450). In other words, if the terminal decides to skip reception of a downlink signal / channel in consideration of the HD priority rule, the terminal may receive a PDCCH (1440) for a preset time (e.g., T) from the corresponding PDSCH (1430) based on the decision. proc,1 ) can also receive a new PDSCH (1450). According to the above-described operation, unnecessary delay can be prevented.

[0282] If HARQ feedback for a HARQ process ID is disabled, the terminal receives T from the time of reception of the last symbol of the PDSCH associated with the disabled HARQ process ID. proc,1 During the given HARQ process ID, the network (e.g., the base station) may not receive another PDCCH or a new PDSCH carrying a DCI that schedules a PDSCH or a set of slot-aggregated PDSCHs associated with the given HARQ process ID. If HARQ feedback for the HARQ process ID is enabled, the network (e.g., the base station) may not receive a T between one PDSCH and another PDSCH associated with the HARQ process ID. proc,1 A larger interval can be guaranteed. A terminal (e.g., an NTN HD terminal) can skip receiving the previous PDSCH due to the HD priority rule. T proc,1 Since T may span multiple slots, the T between one PDSCH and another PDSCH associated with a disabled HARQ process proc,1The scheduling gap of may not be applied in downlink reception operation. In other words, the T between one PDSCH and another PDSCH associated with a disabled HARQ process proc,1 The scheduling gap may not be necessary if reception of the previous PDSCH is skipped due to HD priority rules.

[0283] Fig. 15 is a conceptual diagram illustrating embodiments of a PDSCH reception method based on a disabled HARQ process.

[0284] Referring to FIG. 15, a terminal may not receive a new PDSCH for a preset period of time starting from the time of reception of the last symbol of the PDSCH associated with the disabled HARQ process. In other words, the PDSCH allocation time for HARQ-disabled PDSCH transmissions may be guaranteed. Improving downlink transmission efficiency may be necessary in NTN HD terminals. Therefore, modifications to the above-described operations may be necessary.

[0285] In a reception procedure of a slot-aggregated PDSCH associated with a disabled HARQ process, a terminal (e.g., an NTN HD terminal) may not receive some of the slot-aggregated PDSCH (1510) due to HD priority rules. For example, reception of a downlink signal / channel (e.g., a PDSCH) in some slot(s) among the aggregated slots may be omitted. In other words, reception of a PDSCH in some slot(s) may be dropped. The terminal may receive a PDSCH from a preset time (e.g., T) from the last symbol of the received PDSCH, excluding the PDSCH that was not received due to the HD priority rules. proc,1 ) may not receive a PDCCH (1520) that allocates another PDSCH within the slot-aggregated PDSCHs. The terminal may not receive a PDCCH (1520) that allocates another PDSCH within the slot-aggregated PDSCHs at a preset time (e.g., T) based on the last PDSCH (1510). proc,1) can be counted. For example, if some PDSCHs among slot-aggregated PDSCHs are not received according to the HD priority rule, the terminal may count the preset time (e.g., T) from the last symbol of the last received PDSCH. proc,1 ) may not receive a PDCCH (1520) that allocates another PDSCH. The embodiment of the present disclosure may not be limited to the above-described operation.

[0286] Figure 16 is a flowchart illustrating a CSI reporting method.

[0287] Referring to FIG. 16, the terminal may be a low-end terminal supporting HD FDD. For example, the terminal may be an HD-FDD terminal, an HD terminal, or an NTN HD terminal. The terminal may be connected to a network (e.g., a base station) (S1610). In S1610, the terminal may be connected to the network based on NTN. The terminal's connection to the network may mean that the connection between the terminal and the network has been established. The terminal may measure an effective channel in a channel state measurement resource (e.g., a measurement resource) (S1620). The terminal may not support uplink transmission and downlink reception operations simultaneously in a paired spectrum based on FDD. In other words, the terminal may perform one operation among uplink transmission and downlink reception operations in the same time interval. The channel state measurement resource may be at least one of a channel measurement resource (CMR) or an interference measurement resource (IMR). The terminal may determine whether to receive a downlink signal in the channel state measurement resource based on an HD priority rule (S1630). In other words, in S1630, the terminal can determine whether to perform a measurement operation on a downlink signal in a channel state measurement resource based on the HD priority rule.

[0288] Alternatively, the terminal may determine whether to receive a downlink signal from a channel state measurement resource based on an HD priority rule. If the terminal determines that the terminal receives a downlink signal from the channel state measurement resource, the terminal may receive the downlink signal from the channel state measurement resource and measure the downlink signal to measure an effective channel. If the terminal determines that the terminal does not receive a downlink signal from the channel state measurement resource, the terminal may not receive a downlink signal from the channel state measurement resource. In this case, the terminal may not measure an effective channel from the channel state measurement resource.

[0289] When a downlink signal and an uplink signal collide in a channel state measurement resource, the terminal can perform an operation (e.g., a DL reception operation or an UL transmission operation) according to one signal based on the priority of the downlink signal and the priority of the uplink signal. If the priority of the downlink signal in the channel state measurement resource is higher than the priority of the uplink signal, the terminal can decide to receive the downlink signal in the channel state measurement resource. If the priority of the downlink signal in the channel state measurement resource is lower than the priority of the uplink signal, the terminal can decide not to receive the downlink signal in the channel state measurement resource. A downlink signal can be interpreted as a signal including at least one of a downlink signal or a downlink channel. An uplink signal can be interpreted as a signal including at least one of an uplink signal or an uplink channel.

[0290] If it is determined that a downlink signal is received from a channel state measurement resource, the terminal can generate CSI based on the measurement result of the downlink signal. The terminal can transmit a CSI report including the CSI to a base station (e.g., a network) from an uplink resource (S1640). If it is determined that a downlink signal is not received from the channel state measurement resource, the terminal can omit the CSI report (S1650). A CSI reference resource can be determined based on a preset value for the delay of the NTN within the uplink resources for transmitting the CSI report. The preset value is K offset It can be. The CSI report can include CSI determined based on the channel measurement status in the CSI reference resource or the most recent channel state measurement in the resource located before the CSI reference resource. The CSI reference resource can belong to the channel state measurement resource. The time from the most recently measured channel state measurement resource for the CSI report to the uplink resource to which the CSI report is transmitted can be the CPU occupancy time.

[0291] The terminal can receive a downlink signal from a channel state measurement resource based on the HD priority rule. The terminal can generate a CSI report based on the measurement result of the downlink signal and transmit the CSI report to a network (e.g., a base station) using the uplink resource (S1640). If the terminal cannot receive a downlink signal from the channel state measurement resource due to the HD priority rule, the terminal can omit the CSI report from the uplink resource (S1650).

[0292] For another example, if the preset value for the delay of the NTN is greater than the threshold, the terminal may omit CSI reporting on the uplink resource. If the terminal cannot transmit a CSI report on the uplink resource due to the HD priority rule, the terminal may end CPU occupancy (e.g., CPU occupancy time) from the time at which it determines that the CSI report cannot be transmitted.

[0293] Figure 17 is a flowchart illustrating a method for receiving a PDSCH based on a disabled HARQ process.

[0294] Referring to Fig. 17, the terminal may be a low-spec terminal supporting HD FDD. For example, the terminal may be an HD-FDD terminal, an HD terminal, or an NTN HD terminal. The terminal may be connected to a network (e.g., a base station) (S1710). In S1710, the terminal may be connected to the network based on the NTN. The terminal being connected to the network may mean that the connection between the terminal and the network has been established. The terminal may deactivate the first HARQ process ID (S1720). The first HARQ process ID may be deactivated by the NTN. The network (e.g., the base station) may transmit information indicating the deactivation of the first HARQ process ID to the terminal through signaling. The terminal may deactivate (e.g., disable) the first HARQ process ID based on the information indicated by the signaling of the base station.

[0295] The terminal may receive a PDSCH associated with a deactivated first HARQ process ID (S1730). If a PDSCH associated with a deactivated first HARQ process ID is received, the terminal may omit transmission of HARQ feedback for the PDSCH. The terminal may determine whether to receive a downlink signal / channel (e.g., a PDSCH) based on HD priorities (S1740). The terminal may determine whether to receive a PDCCH that allocates another PDSCH based on whether or not a downlink signal / channel is received.

[0296] Alternatively, the terminal may determine whether to receive the PDSCH associated with the first deactivated HARQ process ID based on the HD priority rule. If the terminal determines to receive the PDSCH based on the HD priority rule, the terminal may receive the PDSCH associated with the first deactivated HARQ process ID. Since the first HARQ process ID associated with the PDSCH is deactivated, the terminal may not transmit HARQ feedback for the PDSCH to the network (e.g., the base station). If the terminal determines not to receive the PDSCH based on the HD priority rule, the terminal may not receive the PDSCH associated with the first deactivated HARQ process ID.

[0297] When a downlink signal (e.g., a PDSCH scheduling a PDSCH and / or the PDSCH) collides with an uplink signal in a resource for PDSCH reception, the terminal may perform an operation (e.g., a DL reception operation or an UL transmission operation) according to one signal based on the priority of the downlink signal and the priority of the uplink signal. If the priority of the downlink signal in the channel state measurement resource is higher than the priority of the uplink signal, the terminal may determine to receive the downlink signal in the channel state measurement resource. If the priority of the downlink signal in the channel state measurement resource is lower than the priority of the uplink signal, the terminal may determine not to receive the downlink signal in the channel state measurement resource. A downlink signal may be interpreted as a signal including at least one of a downlink signal or a downlink channel. An uplink signal may be interpreted as a signal including at least one of an uplink signal or an uplink channel.

[0298] If the terminal receives a PDSCH based on the HD priority rule, the terminal may not receive a PDCCH that allocates another PDSCH within a preset time from the last symbol of the PDSCH (S1750). In other words, in S1750, the reception operation of the PDCCH that allocates another PDSCH may be omitted. If the terminal does not receive a PDSCH based on the HD priority rule, the terminal may receive a PDCCH that allocates another PDSCH even within a preset time from the last symbol of the PDSCH (S1760).

[0299] For another example, if a PDSCH belongs to slot-aggregated PDSCHs and the terminal does not receive some PDSCHs among the slot-aggregated PDSCHs due to the HD priority rule, the preset time may be determined based on the last received PDSCH among the slot-aggregated PDSCHs.

[0300] In the embodiments, the order of execution of the steps may not be limited to the order described in the present disclosure. Multiple steps may be performed simultaneously, some step(s) may be omitted, other step(s) may be performed additionally, and the steps may be performed in different orders. The embodiments of the present disclosure may be performed independently. Alternatively, a combination of the embodiments of the present disclosure may be applied.

[0301] Embodiments of the present disclosure may be implemented based on a combination of at least one of hardware, firmware, or software. When embodiments of the present disclosure are implemented by hardware, embodiments of the present disclosure may be implemented by at least one of Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), general processors, controllers, microcontrollers, or microprocessors.

[0302] The operations of the method according to the embodiments of the present disclosure can be implemented as a computer-readable program or code on a computer-readable recording medium. A computer-readable recording medium includes any type of recording device that stores information readable by a computer system. Furthermore, a computer-readable recording medium can be distributed across network-connected computer systems, allowing the computer-readable program or code to be stored and executed in a distributed manner.

[0303] Additionally, the computer-readable recording medium may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, etc. The program instructions may include not only machine language codes produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter, etc.

[0304] While some aspects of the present disclosure have been described in the context of a device, they may also represent a description of a corresponding method, wherein a block or device corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of a method may also be described as a corresponding block or item or a feature of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as, for example, a microprocessor, a programmable computer, or an electronic circuit. In some embodiments, at least one or more of the most significant method steps may be performed by such a device.

[0305] In embodiments, a programmable logic device (e.g., a field-programmable gate array) may be used to perform some or all of the functions of the methods described herein. In embodiments, the field-programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described herein. In general, the methods are preferably performed by some hardware device.

[0306] Although the present disclosure has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present disclosure without departing from the spirit and scope of the present disclosure as set forth in the claims below.

Claims

1. As a terminal method, A step of determining whether to receive a downlink signal based on a priority rule in a measurement resource; A step of performing measurement based on the downlink signal when it is determined that the terminal receives the downlink signal from the above measurement resource; A step of generating a CSI (channel state information) report based on the above measurement; and Comprising a step of transmitting the CSI report to the base station from the uplink resource, Terminal method.

2. In claim 1, The terminal does not perform an uplink transmission operation and a downlink reception operation simultaneously in a paired spectrum based on FDD (frequency division duplex), and the terminal performs one operation among the uplink transmission operation and the downlink reception operation in the same time period of the paired spectrum. Terminal method.

3. In claim 1, In the above measurement resource, if the downlink signal collides with the uplink signal, whether the downlink signal is received is determined based on the priority rule. Terminal method.

4. In claim 1, The above measurement resource includes at least one of a CMR (channel measurement resource) or an IMR (interference measurement resource). Terminal method.

5. In claim 1, The above CSI report is determined based on the measurement in a CSI reference resource within the measurement resource or the measurement in a resource prior to the CSI reference resource, and the CSI reference resource is determined based on a preset value for a non-terrestrial network (NTN) delay. Terminal method.

6. In claim 1, The time from the resource where the last measurement was performed within the above measurement resource to the uplink resource where the CSI report is transmitted is the CPU (CSI processing unit) occupancy time. Terminal method.

7. In claim 1, The CPU occupancy time ends from the time when it is determined that the transmission of the CSI report is not performed based on the above priority rule. Terminal method.

8. In claim 1, If it is determined that the terminal does not receive the downlink signal in the above measurement resource, transmission of the CSI report is omitted. Terminal method.

9. In claim 1, If the preset value for NTN delay is greater than the threshold, transmission of the CSI report is skipped. Terminal method.

10. As a terminal method, A step of receiving information from a base station indicating deactivation of a first HARQ (hybrid automatic repeat request) process ID (identifier); A step of determining whether to receive a PDSCH (physical downlink shared channel) associated with the first HARQ process ID based on a priority rule; and A step of determining whether to receive a PDCCH (physical downlink control channel) for scheduling another PDSCH based on whether to receive the above PDSCH, Terminal method.

11. In claim 10, If the first HRAQ process ID is disabled, HARQ feedback for the PDSCH associated with the first HARQ process ID is not transmitted. Terminal method.

12. In claim 10, If the reception of the PDSCH and the transmission of the uplink signal collide in the same time interval, whether the PDSCH is received is determined based on the priority rule. Terminal method.

13. In claim 10, If the terminal is determined to receive the PDSCH based on the priority rule, the terminal does not receive the PDCCH scheduling the other PDSCH within a preset time from the last symbol of the PDSCH. Terminal method.

14. In claim 10, If it is determined that the terminal does not receive the PDSCH based on the priority rule, the terminal receives the PDCCH scheduling the other PDSCH within a preset time from the last symbol of the PDSCH. Terminal method.

15. In claim 14, If the PDSCH belongs to slot-aggregated PDSCHs and the terminal is determined not to receive the PDSCH based on the priority rule, the preset time is determined based on the last received PDSCH among the slot-aggregated PDSCHs. Terminal method.

16. As a terminal, Contains at least one processor, At least one processor of the terminal, Determine whether to receive a downlink signal based on a priority rule in a measurement resource; When it is determined that the terminal receives the downlink signal from the above measurement resource, measurement based on the downlink signal is performed; Generate a CSI (channel state information) report based on the above measurements; and Causing the above CSI report to be transmitted to the base station from the uplink resource, Terminal.

17. In claim 16, The terminal does not perform an uplink transmission operation and a downlink reception operation simultaneously in a paired spectrum based on FDD (frequency division duplex), and the terminal performs one operation among the uplink transmission operation and the downlink reception operation in the same time period of the paired spectrum. Terminal.

18. In claim 16, In the above measurement resource, if the downlink signal collides with the uplink signal, whether the downlink signal is received is determined based on the priority rule. Terminal.

19. In claim 16, The above CSI report is determined based on the measurement in a CSI reference resource within the measurement resource or the measurement in a resource prior to the CSI reference resource, and the CSI reference resource is determined based on a preset value for a non-terrestrial network (NTN) delay. Terminal.

20. In claim 16, If it is determined that the terminal does not receive the downlink signal in the above measurement resource, transmission of the CSI report is omitted. Terminal.

Images