Method and apparatus for switching uplink signal transmission scheme in wireless communication system

Abstract

The objective of the present disclosure is to configure an uplink signal transmission method in a wireless communication system. The method performed by a terminal may comprise the steps of: receiving an upper layer signal and at least one piece of downlink control information (DCI) from a transmission reception point (TRP); setting a signal transmission scheme of an uplink shared channel to one of a single-TRP (sTRP) transmission scheme and a multi-TRP (mTRP) transmission scheme on the basis of the upper layer signal and the at least one piece of DCI; setting a signal transmission scheme of an uplink control channel to one of the single-TRP transmission scheme and the multi-TRP transmission scheme on the basis of at least one of the upper layer signal and the at least one piece of DCI; and transmitting an uplink shared channel signal and an uplink control channel signal to the TRP according to the set signal transmission schemes.

Description

Method and device for switching uplink signal transmission method in wireless communication system

[0001] The present disclosure relates to a device and method for switching an uplink signal transmission method in a wireless communication system.

[0002] Communication networks (e.g., 5G communication networks, 6G communication networks, etc.) are being developed to provide improved communication services compared to existing communication networks (e.g., long term evolution (LTE), advanced LTE-A (LTE-A), etc.). 5G communication networks (e.g., new radio (NR) communication networks) can support frequency bands above 6 GHz as well as frequency bands below 6 GHz. That is, 5G communication networks can support FR1 bands and / or FR2 bands. 5G communication networks can support various communication services and scenarios compared to LTE communication networks. For example, usage scenarios of 5G communication networks can include enhanced Mobile Broadband (eMBB), Ultra Reliable Low Latency Communication (URLLC), massive Machine Type Communication (mMTC), etc.

[0003] Compared to 5G, 6G communication networks can support a wider range of communication services and scenarios. 6G communication networks can meet requirements for ultra-high performance, ultra-high bandwidth, ultra-high space, ultra-high precision, ultra-intelligence, and / or ultra-reliability. 6G communication networks can support diverse and wide frequency bands and be applied to various usage scenarios (e.g., terrestrial communications, non-terrestrial communications, sidelink communications, etc.).

[0004] Meanwhile, in 5G NR, Multiple Transmission and Reception Point (mTRP) technology refers to a technique in which a base station (e.g., gNB) communicates with terminals by utilizing multiple Transmission Reception Points (TRPs) that are physically separated. MTRP technology can solve the problem of reduced Quality-of-Service (QoS) when terminals located at the cell-edge are far from the base station, and the problem of inter-cell interference from base stations located in different cells. Furthermore, MTPR technology can play a role in providing an additional communication path, a non-line-of-sight (NLOS) path, from the base station in cases where the line-of-sight (NLOS) path from the base station is limited, such as in millimeter wave bands.

[0005] Beam management for TRP in 5G NR can be defined as a set of L1 / L2 procedures that find or maintain the optimal beam required for transmission / reception of each TRP and UE. In particular, for beam management related to analog beamforming, a transmission configuration index (TCI) has been introduced to configure the UE's reception beam for a specific channel / signal, such as PDSCH / CSI-RS / PDCCH. TCI was introduced to dynamically indicate quasi-colocation (QCL) information through downlink control information (DCI) at the base station.

[0006] On the other hand, depending on the status and circumstances of the communication channel, it is necessary to switch between the uplink signal transmission method, Single Transmission and Reception Point (sTRP) mode and Multiple Transmission and Reception Point mode. However, the method and related procedures for switching between Single Transmission and Reception Point mode and Multiple Transmission and Reception Point mode are not defined. Therefore, a method for switching between Single Transmission and Reception Point mode and Multiple Transmission and Reception Point mode is required.

[0007] Meanwhile, the technology that serves as the background for the invention is written to promote understanding of the background for the invention, and may include content that is not a prior art already known to a person with ordinary skill in the field to which the technology belongs.

[0008] The present disclosure may provide a device and method for setting a transmission method of an uplink signal based on a single uplink DCI (downlink control information) in a wireless communication system as a single Transmission and Reception Point (sTRP) method or a multiple Transmission and Reception Point (mTRP) method.

[0009] The present disclosure can provide a device and method for independently setting a signal transmission method of an uplink shared channel and an uplink control channel based on a single uplink DCI in a wireless communication system.

[0010] The present disclosure can provide a device and method for setting the signal transmission method of an uplink shared channel and an uplink control channel to be the same based on a single uplink DCI in a wireless communication system.

[0011] The technical objectives to be achieved in the present disclosure are not limited to those mentioned above, and other technical tasks not mentioned can be considered by a person having ordinary skill in the technical field to which the technical configuration of the present disclosure is applied from the embodiments of the present disclosure described below.

[0012] As an example of the present disclosure, a method of operating a terminal in a wireless communication system may include the steps of: receiving an upper layer signal and at least one downlink control information (DCI) from a transmission reception point (TRP); setting a signal transmission method of an uplink shared channel to one of a single-TRP (sTRP) transmission method and a multi-TRP (mTRP) transmission method based on the upper layer signal and the at least one DCI; setting a signal transmission method of an uplink control channel to one of the single-TRP transmission method and the multi-TRP transmission method based on at least one of the upper layer signal and the at least one DCI; and transmitting an uplink shared channel signal and an uplink control channel signal to the TRP according to the set signal transmission method.

[0013] Here, the signal transmission method of the above uplink shared channel can be set based on the method indicated by the SRS (sounding reference signal) resource set indicator of the uplink DCI.

[0014] Here, the signal transmission method of the uplink control channel and the signal transmission method of the uplink shared channel can be set independently of each other.

[0015] Here, the signal transmission method of the uplink control channel can be set based on a transmission configuration indicator (TCI) status indicator indicated by the upper layer signal.

[0016] Here, the signal transmission method of the uplink control channel can be set based on TCI status-related information of an RRC (radio resource control) signal.

[0017] Here, the signal transmission method of the uplink control channel can be set to be the same as the signal transmission method of the uplink shared channel.

[0018] Here, when the value of the SRS resource set indicator of the uplink DCI is a predetermined value, the signal transmission method of the uplink control channel can be set to be the same as the signal transmission method of the uplink shared channel.

[0019] Here, if the uplink DCI does not include the SRS resource set indicator, the signal transmission method of the uplink shared channel may be set based on a method indicated by TCI status-related information of downlink DCI transmitted before the uplink DCI.

[0020] As an example of the present disclosure, a method for operating a transmission reception point (TRP) in a wireless communication system includes the steps of transmitting an upper layer signal and at least one downlink control information (DCI) to a terminal, and the steps of receiving an uplink shared channel signal from the terminal, and the steps of receiving an uplink control channel signal from the terminal, wherein a signal transmission method of the uplink shared channel and a signal transmission method of the uplink control channel can be set to one of a single-TRP (sTRP) transmission method and a multi-TRP (multi-TRP, mTRP) transmission method based on at least one of the upper layer signal and the at least one DCI.

[0021] Here, the signal transmission method of the above uplink shared channel can be set based on the method indicated by the SRS (sounding reference signal) resource set indicator of the uplink DCI.

[0022] Here, the signal transmission method of the uplink control channel and the signal transmission method of the uplink shared channel can be set independently of each other.

[0023] Here, the signal transmission method of the uplink control channel can be set based on a transmission configuration indicator (TCI) status indicator indicated by the upper layer signal.

[0024] Here, the signal transmission method of the uplink control channel can be set based on TCI status-related information of an RRC (radio resource control) signal.

[0025] Here, the signal transmission method of the uplink control channel can be set to be the same as the signal transmission method of the uplink shared channel.

[0026] Here, when the value of the SRS resource set indicator of the uplink DCI is a predetermined value, the signal transmission method of the uplink control channel can be set to be the same as the signal transmission method of the uplink shared channel.

[0027] Here, if the uplink DCI does not include the SRS resource set indicator, the signal transmission method of the uplink shared channel may be set based on a method indicated by TCI status-related information of downlink DCI transmitted before the uplink DCI.

[0028] As an example of the present disclosure, in a wireless communication system, a terminal includes at least one transmitter, at least one receiver, at least one processor, and at least one memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a specific operation, wherein the specific operation comprises: receiving an upper layer signal and at least one downlink control information (DCI) from a transmission reception point (TRP), and setting a signal transmission scheme of an uplink shared channel to one of a single-TRP (sTRP) transmission scheme and a multi-TRP (mTRP) transmission scheme based on the upper layer signal and the at least one DCI, and setting a signal transmission scheme of an uplink control channel to one of a single-TRP transmission scheme and a multi-TRP transmission scheme based on at least one of the upper layer signal and the at least one DCI, and transmitting an uplink shared channel signal and an uplink control channel signal to the TRP according to the set signal transmission scheme.

[0029] As an example of the present disclosure, a transmission reception point (TRP) operating in a wireless communication system includes at least one transmitter, at least one receiver, at least one processor, and at least one memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform a specific operation, wherein the specific operation comprises: receiving an uplink shared channel signal from the terminal, and receiving an uplink control channel signal from the terminal, wherein a signal transmission method of the uplink shared channel and a signal transmission method of the uplink control channel can be set to one of a single-TRP (sTRP) transmission method and a multi-TRP (mTRP) transmission method based on at least one of the upper layer signal and the at least one DCI.

[0030] The above-described aspects of the present disclosure are only some of the preferred embodiments of the present disclosure, and various embodiments reflecting the technical features of the present disclosure can be derived and understood by a person having ordinary skill in the art based on the detailed description of the present disclosure to be described below.

[0031] The following effects may be achieved by embodiments based on the present disclosure.

[0032] According to the present disclosure, in a wireless communication system, a transmission method of an uplink signal can be set to a single TRP method or a multiple TRP method based on a single uplink DCI.

[0033] The present disclosure can efficiently switch the transmission method of an uplink signal based on a single uplink DCI in a wireless communication system.

[0034] The effects that can be obtained from the embodiments of the present disclosure are not limited to the effects mentioned above, and other effects that are not mentioned can be clearly derived and understood by those skilled in the art to which the technical configuration of the present disclosure is applied, from the description of the embodiments of the present disclosure below. In other words, unintended effects that result from implementing the configuration described in the present disclosure can also be derived by those skilled in the art from the embodiments of the present disclosure.

[0035] The accompanying drawings are intended to aid in understanding the present disclosure and, together with detailed descriptions, may provide embodiments of the present disclosure. However, the technical features of the present disclosure are not limited to specific drawings, and the features disclosed in each drawing may be combined with each other to form new embodiments. Reference numerals in each drawing may indicate structural elements.

[0036] Figure 1 is a conceptual diagram illustrating an embodiment of a communication system.

[0037] Figure 2 is a block diagram illustrating an embodiment of a communication node constituting a communication system.

[0038] Figure 3 is a block diagram illustrating an embodiment of wireless devices performing communication.

[0039] Figure 4a is a block diagram illustrating an embodiment of a transmission path.

[0040] Figure 4b is a block diagram illustrating an embodiment of a receiving path.

[0041] Figure 5 is a conceptual diagram illustrating an embodiment of a system frame in a communication system.

[0042] Figure 6 is a conceptual diagram illustrating an embodiment of a subframe in a communication system.

[0043] Figure 7 is a conceptual diagram illustrating an embodiment of a slot in a communication system.

[0044] Figure 8 is a conceptual diagram illustrating an embodiment of time-frequency resources in a communication system.

[0045] Figure 9 illustrates an example of a QCL relationship between reference signals applicable to the present disclosure.

[0046] FIG. 10 illustrates an example of a procedure for integrating and setting a beam for multiple channels or reference signals through a unified TCI state according to one embodiment of the present disclosure.

[0047] FIG. 11 illustrates an example of a setup procedure of each layer for transmitting a TCI state in an M-TRP structure according to one embodiment of the present disclosure.

[0048] FIG. 12 illustrates an example of a procedure for transmitting an uplink signal according to one embodiment of the present disclosure.

[0049] FIG. 13 illustrates an example of a procedure for setting a signal transmission method of an uplink shared channel signal and an uplink control channel signal and transmitting the signal according to one embodiment of the present disclosure.

[0050] FIG. 14 illustrates an example of a procedure for setting a signal transmission method of an uplink control channel based on a TCI state indicated by a higher layer signal according to one embodiment of the present disclosure.

[0051] FIG. 15 illustrates an example of a procedure for setting a signal transmission method of an uplink control channel based on a TCI state set by RRC according to one embodiment of the present disclosure.

[0052] FIG. 16 illustrates an example of a procedure for transmitting signals by setting the signal transmission method of an uplink shared channel signal and an uplink control channel signal to be the same according to one embodiment of the present disclosure.

[0053] FIG. 17 illustrates an example of a procedure for setting a signal transmission method of an uplink shared channel signal and an uplink control channel signal according to one embodiment of the present disclosure.

[0054] FIG. 18 illustrates an example of a procedure for setting a signal transmission method of an uplink shared channel signal and an uplink control channel signal according to one embodiment of the present disclosure.

[0055] FIG. 19 illustrates an example of a procedure for setting a transmission method of an uplink signal based on the presence or absence of an SRS resource set indicator of an uplink DCI according to one embodiment of the present disclosure.

[0056] FIG. 20 illustrates an example of a procedure for setting a transmission method of an uplink signal according to one embodiment of the present disclosure.

[0057] This disclosure may be subject to various modifications and various embodiments. Specific embodiments are illustrated and described in detail in the drawings. However, this is not intended to limit the disclosure to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the disclosure.

[0058] 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 disclosure, 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" may refer to a combination of multiple related items described herein or to any of multiple related items described herein.

[0059] In the present disclosure, “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.” Additionally, in the present disclosure, “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.”

[0060] In the present disclosure, (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.”

[0061] 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.

[0062] The terminology used in this disclosure is only used to describe specific embodiments and is not intended to limit the present disclosure. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this disclosure, it should be understood that the terms "comprises" or "has" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0063] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which this disclosure 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 shall not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0064] Hereinafter, preferred embodiments of the present disclosure will be described in more detail with reference to the attached drawings. In order to facilitate an overall understanding in describing the present disclosure, the same reference numerals will be used for identical components in the drawings, and redundant descriptions of identical components will be omitted. In addition to the embodiments explicitly described in the present disclosure, operations may be performed according to combinations of embodiments, extensions of embodiments, and / or modifications of embodiments. The performance of some operations may be omitted, and the order of operation may be changed.

[0065] In an embodiment, even if a method (e.g., transmitting or receiving a signal) performed by a first communication node among communication nodes is described, a corresponding second communication node can perform a method (e.g., receiving or transmitting a signal) corresponding to the method performed by the first communication node. That is, if an operation of a UE (user equipment) is described, a corresponding base station can perform an operation corresponding to the operation of the UE. Conversely, if an operation of a base station is described, a corresponding UE can perform an operation corresponding to the operation of the base station.

[0066] A base station may be referred to as a NodeB, an evolved NodeB, a gNodeB (next generation node B), a gNB, a device, an apparatus, a node, a communication node, a BTS (base transceiver station), a RRH (radio remote head), a TRP (transmission reception point), a RU (radio unit), an RSU (road side unit), a radio transceiver, an access point, an access node, etc. A UE may be referred to as a terminal, a device, an apparatus, a node, a communication node, an end node, an access terminal, a mobile terminal, a station, a subscriber station, a mobile station, a portable subscriber station, an OBU (on-broad unit), etc.

[0067] In the present disclosure, signaling may be at least one of upper layer signaling, MAC signaling, or PHY (physical) signaling. A message used for upper layer signaling may be referred to as an "upper layer message" or an "upper layer signaling message." A message used for MAC signaling may be referred to as a "MAC message" or a "MAC signaling message." A message used for PHY signaling may be referred to as a "PHY message" or a "PHY signaling message." Upper layer signaling may refer to a transmission and reception operation of system information (e.g., a master information block (MIB), a system information block (SIB)) and / or an RRC message. MAC signaling may refer to a transmission and reception operation of a MAC control element (CE). PHY signaling may refer to a transmission and reception operation of control information (e.g., downlink control information (DCI), uplink control information (UCI), sidelink control information (SCI)).

[0068] In the present disclosure, “an operation (e.g., a transmission operation) is set” may mean that “setting information for the operation (e.g., an information element, a parameter)” and / or “information instructing the performance of the operation” is signaled. “An information element (e.g., a parameter) is set” may mean that the information element is signaled. In the present disclosure, “a signal and / or a channel” may mean a signal, a channel, or “a signal and a channel,” and a signal may be used to mean “a signal and / or a channel.”

[0069] The communication network to which the embodiment is applied is not limited to what is described below, and the embodiment may be applied to various communication networks (e.g., 4G communication networks, 5G communication networks, and / or 6G communication networks). Here, the communication network may be used in the same sense as the communication system.

[0070] Figure 1 is a conceptual diagram illustrating an embodiment of a communication system.

[0071] Referring to FIG. 1, the 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). In addition, the communication system (100) may further include a core network (e.g., a serving-gateway (S-GW), a packet data network (PDN)-gateway (P-GW), a mobility management entity (MME)). If the communication system (100) is a 5G communication system (e.g., a new radio (NR) system), the core network may include an access and mobility management function (AMF), a user plane function (UPF), a session management function (SMF), etc.

[0072] A plurality of communication nodes (110 to 130) can support a communication protocol specified in the 3rd generation partnership project (3GPP) standard (e.g., LTE communication protocol, LTE-A communication protocol, NR communication protocol, etc.). The plurality of communication nodes (110 to 130) may support CDMA (code division multiple access) technology, WCDMA (wideband CDMA) technology, TDMA (time division multiple access) technology, FDMA (frequency division multiple access) technology, OFDM (orthogonal frequency division multiplexing) technology, Filtered OFDM technology, CP (cyclic prefix)-OFDM technology, DFT-s-OFDM (discrete Fourier transform-spread-OFDM) technology, OFDMA (orthogonal frequency division multiple access) technology, SC (single carrier)-FDMA technology, NOMA (non-orthogonal multiple access) technology, GFDM (generalized frequency division multiplexing) technology, FBMC (filter bank multi-carrier) technology, UFMC (universal filtered multi-carrier) technology, SDMA (space division multiple access) technology, etc. Each of the plurality of communication nodes may have the following structure.

[0073] Figure 2 is a block diagram illustrating an embodiment of a communication node constituting a communication system.

[0074] FIG. 2 is a diagram illustrating an example of a wireless device (200) in a wireless communication system according to one embodiment of the present disclosure. The wireless device (200) according to the embodiment of the present disclosure may be a mobile terminal such as a smartphone, tablet PC, or wearable device, but is not limited thereto.

[0075] Referring to FIG. 2, the wireless device (200) may include at least one control unit (210), at least one memory (220), at least one power supply unit (230), at least one transceiver unit (240), at least one input unit (250), at least one output unit (260), and / or at least one antenna (270).

[0076] The control unit (210) can control the memory (220) and / or the transceiver unit (240), and can be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in the present disclosure. The memory (220) can be connected to the control unit (210) and can store various information related to the operation of the control unit (210). For example, the memory (220) can perform some or all of the controls controlled by the control unit (210), or store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in the present disclosure. The configuration of the memory is not limited in a specific manner. For example, it can be configured as at least one of a read-only memory (ROM) and a random access memory (RAM).

[0077] At least one control unit (210) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in the present disclosure may be implemented using firmware or software in the form of codes, instructions, and / or a set of instructions. Here, the firmware or software may execute another program stored in a memory (220), such as an OS. The control unit (210) may be implemented to support beamforming or directional routing operations in which signals from at least one antenna (270) are differently weighted to effectively steer signals outgoing in a desired direction.

[0078] Additionally, at least one control unit (210) may be coupled to a backhaul or network interface. The wireless device (200) may communicate with other wireless devices through the backhaul or network interface. The control unit (210) may include at least one processor. The processor may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which methods according to embodiments of the present disclosure are performed.

[0079] At least one transceiver (240) may be connected to the control unit (210) and may transmit and / or receive a wireless signal via at least one antenna (270). The transceiver (240) may include a transmitter and / or a receiver. The at least one transceiver (240) may transmit user data, control information, wireless signals / channels, etc. mentioned in the methods and / or operation flowcharts of the present disclosure to at least one other device. For example, the at least one transceiver (240) may be connected to at least one control unit (210) and may transmit and receive wireless signals. In addition, the at least one control unit (210) may control the at least one transceiver (240) to transmit user data, control information, or a wireless signal to at least one other device. The at least one transmitter (240) may receive a signal transmitted by another wireless device from at least one antenna (270). Additionally, at least one transceiver (24) may downconvert or upconvert the received signal to generate a baseband signal. At least one antenna (270) may be a plurality of physical antennas or a plurality of logical antennas (e.g., antenna ports).

[0080] The input unit (250) can obtain information such as user input, video, and audio, and can include various input means such as various mechanical / electronic input means, cameras, and microphones. The output unit (260) is for providing information to users by generating output related to sight, hearing, or touch, and can include a display, a speaker, a vibration module, and the like. The wireless device (200) supplies power through the power supply unit (230), and the power supply unit (230) can include a wired / wireless charging circuit, a battery, and the like.

[0081] 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). Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) may form a macro cell. Each of the fourth base station (120-1) and the fifth base station (120-2) may form a small cell. The fourth base station (120-1), the third terminal (130-3), and the fourth terminal (130-4) may 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) may 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).

[0082] 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 (NB), an evolved NodeB (eNB), a gNB, an advanced base station (ABS), a high reliability-base station (HR-BS), a base transceiver station (BTS), a radio base station, a radio transceiver, an access point, an access node, a radio access station (RAS), a mobile multihop relay-base station (MMR-BS), a relay station (RS), an advanced relay station (ARS), a high reliability-relay station (HR-RS), a home NodeB (HNB), a home eNodeB (HeNB), a road side unit (RSU), a radio remote head (RRH), a transmission point (TP), a transmission and reception point (TRP), etc.

[0083] Each of the plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) may be referred to as a user equipment (UE), terminal equipment (TE), advanced mobile station (AMS), high reliability-mobile station (HR-MS), terminal, access terminal, mobile terminal, station, subscriber station, mobile station, portable subscriber station, node, device, on board unit (OBU), etc.

[0084] 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.

[0085] Additionally, each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may support MIMO transmission (e.g., single user (SU)-MIMO, multi user (MU)-MIMO, massive MIMO, etc.), coordinated multipoint (CoMP) transmission, carrier aggregation (CA) transmission, transmission in an unlicensed band, sidelink communication (e.g., device to device communication (D2D), proximity services (ProSe)), Internet of Things (IoT) communication, dual connectivity (DC), etc. Here, each of the plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) can perform an operation corresponding to the base station (110-1, 110-2, 110-3, 120-1, 120-2) and an operation supported by the base station (110-1, 110-2, 110-3, 120-1, 120-2). For example, the second base station (110-2) can transmit a signal to the fourth terminal (130-4) based on the SU-MIMO scheme, and the fourth terminal (130-4) can receive a signal from the second base station (110-2) by the SU-MIMO scheme. Alternatively, the second base station (110-2) can transmit signals to the fourth terminal (130-4) and the fifth terminal (130-5) based on the MU-MIMO method, and each of the fourth terminal (130-4) and the fifth terminal (130-5) can receive signals from the second base station (110-2) based on the MU-MIMO method.

[0086] Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can transmit a signal to the fourth terminal (130-4) based on the CoMP scheme, and the fourth terminal (130-4) can receive a signal from the first base station (110-1), the second base station (110-2), and the third base station (110-3) based on the CoMP scheme. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can transmit and receive a signal with terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) within its cell coverage based on the CA scheme. Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can control sidelink communication between the fourth terminal (130-4) and the fifth terminal (130-5), and each of the fourth terminal (130-4) and the fifth terminal (130-5) can perform sidelink communication under the control of the second base station (110-2) and the third base station (110-3), respectively.

[0087] Meanwhile, communication nodes performing communication in a communication network may be configured as follows. The communication node illustrated in FIG. 3 may be a specific embodiment of the wireless device illustrated in FIG. 2.

[0088] Figure 3 is a block diagram illustrating an embodiment of wireless devices performing communication.

[0089] Referring to FIG. 3, each of the first wireless device (300a) and the second wireless device (300b) may be a base station or a UE. The first wireless device (300a) may transmit a signal to the second wireless device (300b). The transmission processor (311) included in the first wireless device (300a) may receive data (e.g., a data unit) from a data source (310). The transmission processor (311) may receive control information from the controller (316). The control information may include at least one of system information, RRC configuration information (e.g., information configured by RRC signaling), MAC control information (e.g., MAC CE), or PHY control information (e.g., DCI, SCI).

[0090] The transmitting processor (311) may perform a processing operation on data (e.g., an encoding operation, a symbol mapping operation, etc.) to generate data symbol(s). The transmitting processor (311) may perform a processing operation on control information (e.g., an encoding operation, a symbol mapping operation, etc.) to generate control symbol(s). In addition, the transmitting processor (311) may generate synchronization / reference symbol(s) for a synchronization signal and / or a reference signal.

[0091] The Tx MIMO processor (312) may perform a spatial processing operation (e.g., a precoding operation) on data symbol(s), control symbol(s), and / or synchronization / reference symbol(s). The output (e.g., a symbol stream) of the Tx MIMO processor (312) may be provided to modulators (MODs) included in the transceivers (313a to 313t). The modulators (MODs) may perform a processing operation on the symbol stream to generate modulation symbols, and may perform an additional processing operation (e.g., an analog conversion operation, an amplification operation, a filtering operation, an upconversion operation) on the modulation symbols to generate signals. The signals generated by the modulators (MODs) of the transceivers (313a to 313t) may be transmitted via the antennas (314a to 314t).

[0092] Signals transmitted by the first wireless device (300a) may be received by the antennas (364a to 364r) of the second wireless device (300b). The signals received by the antennas (364a to 364r) may be provided to demodulators (DEMODs) included in the transceivers (363a to 363r). The demodulator (DEMOD) may perform a processing operation (e.g., a filtering operation, an amplification operation, a downconversion operation, a digital conversion operation) on the signal to obtain samples. The demodulator (DEMOD) may perform an additional processing operation on the samples to obtain symbols. The MIMO detector (362) may perform a MIMO detection operation on the symbols. The receiving processor (361) may perform a processing operation (e.g., a deinterleaving operation, a decoding operation) on the symbols. The output of the receiving processor (361) may be provided to a data sink (360) and a controller (366). For example, data may be provided to the data sink (360), and control information may be provided to the controller (366).

[0093] Meanwhile, the second wireless device (300b) can transmit a signal to the first wireless device (300a). The transmitting processor (368) included in the second wireless device (300b) can receive data (e.g., data units) from a data source (367) and perform a processing operation on the data to generate data symbol(s). The transmitting processor (368) can receive control information from the controller (366) and perform a processing operation on the control information to generate control symbol(s). In addition, the transmitting processor (368) can perform a processing operation on a reference signal to generate reference symbol(s).

[0094] The Tx MIMO processor (369) may perform spatial processing operations (e.g., precoding operations) on data symbol(s), control symbol(s), and / or reference symbol(s). The output (e.g., symbol stream) of the Tx MIMO processor (369) may be provided to modulators (MODs) included in the transceivers (363a to 363t). The modulators (MODs) may perform processing operations on the symbol streams to generate modulation symbols, and may perform additional processing operations (e.g., analog conversion operations, amplification operations, filtering operations, upconversion operations) on the modulation symbols to generate signals. The signals generated by the modulators (MODs) of the transceivers (363a to 363t) may be transmitted via the antennas (364a to 364t).

[0095] Signals transmitted by the second wireless device (300b) may be received by the antennas (314a to 314r) of the first wireless device (300a). The signals received by the antennas (314a to 314r) may be provided to demodulators (DEMODs) included in the transceivers (313a to 313r). The demodulator (DEMOD) may perform a processing operation (e.g., a filtering operation, an amplification operation, a downconversion operation, a digital conversion operation) on the signal to obtain samples. The demodulator (DEMOD) may perform an additional processing operation on the samples to obtain symbols. The MIMO detector (320) may perform a MIMO detection operation on the symbols. The receiving processor (319) may perform a processing operation (e.g., a deinterleaving operation, a decoding operation) on the symbols. The output of the receiving processor (319) may be provided to a data sink (318) and a controller (316). For example, data may be provided to the data sink (318) and control information may be provided to the controller (316).

[0096] Memories (315 and 365) can store data, control information, and / or program code. Scheduler (317) can perform scheduling operations for communication. The processors (311, 312, 319, 361, 368, 369) and controllers (316, 366) illustrated in FIG. 3 may be the processor (210) illustrated in FIG. 2 and may be used to perform the methods described in the present disclosure.

[0097] FIG. 4a is a block diagram illustrating an embodiment of a transmission path, and FIG. 4b is a block diagram illustrating an embodiment of a reception path.

[0098] Referring to FIGS. 4A and 4B, a transmission path (410) may be implemented in a communication node that transmits a signal, and a reception path (420) may be implemented in a communication node that receives a signal. The transmission path (410) may include a channel coding and modulation block (411), an S-to-P (serial-to-parallel) block (512), an N IFFT (Inverse Fast Fourier Transform) block (413), a P-to-S (parallel-to-serial) block (414), a CP (cyclic prefix) addition block (415), and an UC (up-converter) (UC) (416). The receiving path (420) may include a DC (down-converter) (421), a CP removal block (422), an S-to-P block (423), an N FFT block (424), a P-to-S block (425), and a channel decoding and demodulation block (426). Here, N may be a natural number.

[0099] In the transmission path (410), information bits may be input to a channel coding and modulation block (411). The channel coding and modulation block (411) may perform a coding operation (e.g., a low-density parity check (LDPC) coding operation, a polar coding operation, etc.) and a modulation operation (e.g., a quadrature phase shift keying (QPSK), a quadrature amplitude modulation (QAM), etc.) on the information bits. The output of the channel coding and modulation block (411) may be a sequence of modulation symbols.

[0100] The S-to-P block (412) can convert modulation symbols in the frequency domain into parallel symbol streams to generate N parallel symbol streams. N can be an IFFT size or an FFT size. The N IFFT block (413) can perform an IFFT operation on the N parallel symbol streams to generate signals in the time domain. The P-to-S block (414) can convert the output (e.g., parallel signals) of the N IFFT block (413) into a serial signal to generate a serial signal.

[0101] The CP addition block (415) can insert a CP into a signal. The UC (416) can up-convert the frequency of the output of the CP addition block (415) to an RF (radio frequency) frequency. Additionally, the output of the CP addition block (415) can be filtered at the baseband before up-conversion.

[0102] A signal transmitted from a transmission path (410) may be input to a reception path (420). An operation in the reception path (420) may be the reverse operation of the operation in the transmission path (410). A DC (421) may down-convert the frequency of the received signal to a baseband frequency. A CP removal block (422) may remove a CP from a signal. The output of the CP removal block (422) may be a serial signal. An S-to-P block (423) may convert the serial signal into parallel signals. An N FFT block (424) may perform an FFT algorithm to generate N parallel signals. A P-to-S block (425) may convert the parallel signals into a sequence of modulation symbols. A channel decoding and demodulation block (426) may perform a demodulation operation on the modulation symbols and perform a decoding operation on the result of the demodulation operation to restore data.

[0103] In FIGS. 4A and 4B , Discrete Fourier Transform (DFT) and Inverse DFT (IDFT) may be used instead of FFT and IFFT. Each of the blocks (e.g., components) in FIGS. 4A and 4B may be implemented by at least one of hardware, software, or firmware. For example, some of the blocks in FIGS. 4A and 4B may be implemented by software, and the remaining blocks may be implemented by hardware or a “combination of hardware and software.” In FIGS. 4A and 4B , a block may be subdivided into multiple blocks, multiple blocks may be integrated into a single block, some blocks may be omitted, and blocks supporting other functions may be added.

[0104] Figure 5 is a conceptual diagram illustrating an embodiment of a system frame in a communication system.

[0105] Referring to FIG. 5, time resources in a communication system can be divided into frame units. For example, system frames can be set consecutively in the time domain of the communication system. The length of a system frame can be 10 ms (milliseconds). The system frame number (SFN) can be set from #0 to #1023. In this case, 1024 system frames can be repeated in the time domain of the communication system. For example, the SFN of the system frame after system frame #1023 can be #0.

[0106] A system frame may include two half frames. A half frame may be 5 ms long. A half frame located at the beginning of the system frame may be referred to as "half frame #0," and a half frame located at the end of the system frame may be referred to as "half frame #1." A system frame may include 10 subframes. A subframe may be 1 ms long. The 10 subframes within a system frame may be referred to as "subframes #0-9."

[0107] Figure 6 is a conceptual diagram illustrating an embodiment of a subframe in a communication system.

[0108] Referring to FIG. 6, one subframe may include n slots, where n may be a natural number. Accordingly, one subframe may be composed of one or more slots.

[0109] Figure 7 is a conceptual diagram illustrating an embodiment of a slot in a communication system.

[0110] Referring to Figure 7, a single slot may include one or more symbols. A single slot illustrated in Figure 7 may include 14 symbols. The length of a slot may vary depending on the number and length of symbols contained in the slot. Alternatively, the length of a slot may vary depending on the numerology.

[0111] In a communication system, the numerology applied to physical signals and channels may be variable. The numerology may be variable to meet various technical requirements of the communication system. In a communication system applying CP (cyclic prefix)-based OFDM waveform technology, the numerology may include subcarrier spacing and CP length (or CP type). Table 1 may be an embodiment of a method for configuring a numerology for a CP-OFDM-based communication system. At least some of the numerologies in Table 1 may be supported depending on the frequency band in which the communication system operates. In addition, the communication system may additionally support numerologies not listed in [Table 1].

[0112]

[0113] When the subcarrier spacing is 15 kHz (e.g., μ=0), the slot length can be 1 ms. In this case, one system frame can contain 10 slots. When the subcarrier spacing is 30 kHz (e.g., μ=1), the slot length can be 0.5 ms. In this case, one system frame can contain 20 slots.

[0114] When the subcarrier spacing is 60 kHz (e.g., μ=2), the slot length can be 0.25 ms. In this case, one system frame can contain 40 slots. When the subcarrier spacing is 120 kHz (e.g., μ=3), the slot length can be 0.125 ms. In this case, one system frame can contain 80 slots. When the subcarrier spacing is 240 kHz (e.g., μ=4), the slot length can be 0.0625 ms. In this case, one system frame can contain 160 slots.

[0115] A symbol may be configured as a downlink (DL) symbol, a flexible (FL) symbol, or an uplink (UL) symbol. A slot consisting solely of DL symbols may be referred to as a "DL slot," a slot consisting solely of FL symbols may be referred to as an "FL slot," and a slot consisting solely of UL symbols may be referred to as a "UL slot."

[0116] The slot format can be semi-statically configured by higher layer signaling (e.g., RRC signaling). Information indicating the semi-static slot format can be included in the system information, and the semi-static slot format can be configured cell-specifically. In addition, the semi-static slot format can be additionally configured for each terminal through terminal-specific higher layer signaling (e.g., RRC signaling). The flexible symbol of the cell-specifically configured slot format can be overridden to a downlink symbol or an uplink symbol by terminal-specific higher layer signaling. In addition, the slot format can be dynamically indicated by physical layer signaling (e.g., a slot format indicator (SFI) included in DCI). The semi-statically configured slot format can be overridden by a dynamically indicated slot format. For example, the semi-statically configured flexible symbol can be overridden to a downlink symbol or an uplink symbol by the SFI.

[0117] The reference signal may be a channel state information-reference signal (CSI-RS), a sounding reference signal (SRS), a demodulation-reference signal (DM-RS), a phase tracking-reference signal (PT-RS), etc. The channel may be a physical broadcast channel (PBCH), a physical downlink control channel (PDCCH), a physical downlink shared channel (PDSCH), a physical uplink control channel (PUCCH), a physical uplink shared channel (PUSCH), a physical sidelink control channel (PSCCH), a physical sidelink shared channel (PSSCH), etc. In the present disclosure, the control channel may mean a PDCCH, a PUCCH, or a PSCCH, and the data channel may mean a PDSCH, a PUSCH, or a PSSCH.

[0118] Figure 8 is a conceptual diagram illustrating an embodiment of time-frequency resources in a communication system.

[0119] Referring to FIG. 8, a resource consisting of one symbol (e.g., an OFDM symbol) in the time domain and one subcarrier in the frequency domain may be defined as a "RE (resource element)". Resources consisting of one OFDM symbol in the time domain and K subcarriers in the frequency domain may be defined as a "REG (resource element group)". A REG may include K REs. A REG may be used as a basic unit for resource allocation in the frequency domain. K may be a natural number. For example, K may be 12. N may be a natural number. In the slot illustrated in FIG. 7, N may be 14. N OFDM symbols may be used as a basic unit for resource allocation in the time domain.

[0120] In the present disclosure, RB may mean CRB (common RB). Alternatively, RB may mean PRB or VRB (virtual RB). In a communication system, CRB may mean RB that constitutes a set of consecutive RBs (e.g., a common RB grid) based on a reference frequency (e.g., point A). Carriers and / or bandwidth portions may be arranged on the common RB grid. That is, the carrier and / or bandwidth portions may be composed of CRB(s). RBs or CRBs that constitute the bandwidth portions may be referred to as PRBs, and within the bandwidth portions, the CRB index may be appropriately converted to the PRB index.

[0121] Downlink data can be transmitted via the PDSCH. The base station can transmit PDSCH configuration information (e.g., scheduling information) to the terminal via the PDCCH. The terminal can obtain the PDSCH configuration information by receiving the PDCCH (e.g., downlink control information (DCI)). For example, the PDSCH configuration information can include the MCS (modulation coding scheme) used for transmitting and receiving the PDSCH, time resource information of the PDSCH, frequency resource information of the PDSCH, feedback resource information for the PDSCH, etc. The PDSCH can refer to a radio resource through which downlink data is transmitted and received. Alternatively, the PDSCH can refer to the downlink data itself. The PDCCH can refer to a radio resource through which downlink control information (e.g., DCI) is transmitted and received. Alternatively, the PDCCH can refer to the downlink control information itself.

[0122] A terminal can perform a monitoring operation on the PDCCH to receive a PDSCH transmitted from a base station. The base station can inform the terminal of the configuration information for the PDCCH monitoring operation using a higher layer message (e.g., an RRC (radio resource control) message). The configuration information for the PDCCH monitoring operation can include CORESET (control resource set) information and search space information.

[0123] CORESET information may include PDCCH DMRS (demodulation reference signal) information, PDCCH precoding information, PDCCH opportunity information, etc. The PDCCH DMRS may be a DMRS used to demodulate the PDCCH. The PDCCH opportunity may be a region where the PDCCH can exist. In other words, the PDCCH opportunity may be a region where DCI can be transmitted. The PDCCH opportunity may be referred to as a PDCCH candidate. The PDCCH opportunity information may include time resource information and frequency resource information of the PDCCH opportunity. In the time domain, the length of the PDCCH opportunity may be indicated in symbol units. In the frequency domain, the size of the PDCCH opportunity may be indicated in RB units (e.g., in PRB (physical resource block) units or CRB (common resource block) units).

[0124] The search space information may include a coreset identifier (ID) associated with the search space, a period of PDCCH monitoring, and / or an offset. Each of the PDCCH monitoring period and offset may be indicated on a slot-by-slot basis. In addition, the search space information may further include an index of the symbol at which the PDCCH monitoring operation begins.

[0125] A base station can configure a bandwidth part (BWP) for downlink communication. The BWP can be configured differently for each terminal. The base station can inform the terminal of the BWP configuration information using higher layer signaling. The higher layer signaling can mean "transmission operation of system information" and / or "transmission operation of RRC (radio resource control) message." The number of BWPs configured for one terminal can be one or more. The terminal can receive BWP configuration information from the base station and check the BWP(s) configured by the base station based on the BWP configuration information. When multiple BWPs are configured for downlink communication, the base station can activate one or more BWPs among the multiple BWPs. The base station can transmit the configuration information of the activated BWP(s) to the terminal using at least one of higher layer signaling, a medium access control (MAC) control element (CE), or DCI. The base station can perform downlink communication using the activated BWP(s). The terminal can identify the activated BWP(s) by receiving configuration information of the activated BWP(s) from the base station, and perform a downlink reception operation in the activated BWP(s).

[0126] Multiple Transmission and Reception Point (MTRP) technology refers to a technique in which a base station (e.g., gNB) communicates with a terminal by utilizing multiple transmission reception points (TRPs) that are physically separated. By utilizing multiple TRPs, MTRP technology can solve the problem of reduced quality-of-service (QoS) for terminals located at the cell edge when they are far from the base station, while also resolving the problem of inter-cell interference from base stations located in different cells. Furthermore, MTRP technology can play a role in providing an additional communication path, that is, a non-line-of-sight (NLOS) path, from the base station in cases where the line-of-sight (LOS) path from the base station is limited, such as in millimeter wave bands.

[0127] In the standard, MTRP technology is divided into Coherent Joint Transmission (CJT) and Non-Coherent Joint Transmission (NCJT). The CJT method allows two or more TRPs to cooperate in a synchronized manner to support data transmission to a single terminal based on a stable backhaul link between base stations connected to the TRPs. On the other hand, the NCJT method allows two or more TRPs to decide scheduling, precoding matrix selection, modulation, and coding schemes without cooperation between the TRPs in a situation where two or more TRPs support a single terminal.

[0128] Beam management for TRP in 5G NR can be defined as a set of L1 / L2 procedures that find or maintain the optimal beam required for transmission / reception at each TRP and terminal. Beam management procedures can be broadly categorized into four categories, as follows:

[0129] 1) Beam determination

[0130] 2) Beam measurement

[0131] 3) Beam reporting

[0132] 4) Beam sweeping

[0133] Here, the TRP and the UE can utilize the reciprocity characteristics of the downlink (DL) / uplink (UL) channels when managing beams. For example, the UE can utilize the values ​​measured in the receive beams (Rx beams) of the DL channel when configuring the transmit beam (Tx beam). And, the UE can utilize the values ​​measured in the transmit beams (Tx beams) of the UL channel when configuring the receive beam (Rx beam). These transmit beam configuration and receive beam configuration procedures can be performed in the same manner for the base station as for the UE. In particular, a transmission configuration indicator (TCI) has been introduced for beam management related to analog beamforming. The TCI can be used to configure a beam to be used for transmission of a specific channel and / or signal, for example, PDSCH and / or CSI-RS and / or PDCCH. The base station can dynamically indicate quasi-colocation (QCL) information to the UE by transmitting TCI through downlink control information (DCI).

[0134] Two antenna ports are said to be quasi-co-located when the channel characteristics of a symbol transmitted from one antenna port can be inferred from the channel characteristics of a symbol transmitted from the other antenna port. For convenience of explanation, in the following, when two antenna ports are quasi-co-located, we refer to them as having a QCL relationship.

[0135] Figure 9 illustrates an example of a QCL relationship between reference signals applicable to the present disclosure.

[0136] Referring to Fig. 9, the QCL relationship between reference signals below 5G can be extended to generate information about the TCI state.

[0137] The synchronization signal block (SSB) can be used by terminals to synchronize with the network and acquire basic information. The SSB can be in a QCL relationship with the tracking reference signal (TRS). Therefore, when receiving the TRS, at least one of the Doppler shift, delay average, and spatial characteristics of the SSB can be utilized.

[0138] CSI-RS (channel state information - reference signal): CSI-RS can be used by the network to determine the characteristics of the wireless channel. There are two types of CSI-RS. CSI-RS (CSI ACQ) can be used for CSI reception, and CSI-RS (BM) can be used for beam management (BM).

[0139] SSB and CSI-RS (BM) may be in a QCL relationship with CSI-RS (CSI ACQ), and at least one of the average and spatial characteristics of Doppler shift and delay may be utilized for CSI-RS (CSI ACQ) reception.

[0140] CSI-RS(BM) and SSB may have a QCL relationship with PDCCH DMRS (physical downlink control channel demodulation reference signal), and at least one of Doppler shift / spread and average / spread and spatial characteristics of delay may be utilized for reception of PDCCH DMRS.

[0141] SSB, CSI-RS (BM) and CSI-RS (CSI ACQ) may be in a QCL relationship with PDSCH DMRS, and at least one of the mean / spread and spatial characteristics of Doppler shift / spread and delay may be utilized for reception of PDCCH DMRS.

[0142] 3GGP Rel-17 introduced a TCI configuration method utilizing a unified TCI pool, or the unified TCI framework, to reduce signaling overhead for QCL configuration of DL and / or UL channels and simplify multi-beam operation compared to the previous release of 3GGP Rel-16.

[0143] According to the unified TCI framework, the base station can preset a common TCI pool that can be commonly used (or applied) for DL ​​and UL channels via RRC signaling. Furthermore, according to the unified TCI framework, the base station can directly indicate TCI for DL ​​and UL channels from the configured common TCI pool using the Medium Access Control (MAC) control element (CE) (MAC-CE) / downlink control information (DCI). Furthermore, according to the unified TCI framework, the base station can support updates to the common TCI state.

[0144] A common TCI state can be indicated (or set) for multiple component carriers (CCs). Among the multiple CCs, a reference CC can be additionally set, and TCI updates for other CCs within the indicated list can be performed simultaneously via a TCI update command for the reference CC.

[0145] At this time, there are three main methods for setting the status of TCI for DL ​​channels and UL channels.

[0146] A. Joint TCI state indication method that is commonly indicated to DL / UL channels

[0147] B. DL channel separate TCI state indication method for setting TCI separately for DL ​​channel and

[0148] C. UL Channel Separate TCI State Indication Method

[0149] Looking at the three methods above from a broader perspective, they can be divided into a joint TCI status indication method that provides common indications for both DL and UL channels, and a separate TCI status indication method that sets TCIs separately for each DL or UL channel. The fundamental difference between the two methods above lies in the existence of reciprocity between the DL and UL channels.

[0150] The Unified TCI framework was designed for a single TRP (sTRP) system in 3GPP Rel-17. However, 3GPP Rel-18 aims to expand to a multi-TRP (mTRP) system.

[0151] TCI status can be used to convey QCL relationships to terminals. TCI status contains information about QCL relationships and can be conveyed via DCI. Section 5.1.5 of 3GPP TS 38.214 defines the procedure for conveying QCL information as follows:

[0152]

[0153]

[0154]

[0155]

[0156]

[0157]

[0158]

[0159]

[0160]

[0161]

[0162]

[0163]

[0164] As above, the UE can be configured with TCI-State configuration lists through higher layer parameters (e.g., PDSCH-Config). The UE can decode the PDSCH using the TCI-State configuration lists. Each TCI state can include parameters that configure the QCL relationship between one or two downlink reference signals and the DM-RS port of the PDSCH, the DM-RS port of the PDCCH, or the CSI-RS port(s) of the CSI-RS resource. The QCL can be configured for the first DL RS using the higher layer parameter qcl-Type1, and for the second DL RS using qcl-Type2. The QCL types of the two DL RSs can be configured differently regardless of whether they are DL RSs with the same reference or different DL RSs. The QCL type corresponding to each DL RS can be configured by the higher layer parameter (e.g., qcl-Type in QCL-Info). The QCL type can have one of the following values:

[0165] - typeA: {Doppler shift, Doppler spread, average delay, delay spread}

[0166] - typeB: {Doppler shift, Doppler spread}

[0167] - typeC: {Doppler shift, average delay}

[0168] - typeD: {Spatial Rx parameter}

[0169] Here, the Spatial RX parameter can refer to any one of various parameters, such as Angle of arrival (AoA), Power Angular Spectrum (PAS) of AoA, Angle of departure (AoD), PAS of AoD, transmit / receive channel correlation, transmit / receive beamforming, and spatial channel correlation.

[0170] The base station can transmit configuration information regarding whether to apply information in the transmission configuration indication (TCI) field included in the downlink control information (DCI) to the terminal through upper layer signaling.

[0171] Additionally, the terminal may receive information regarding TCI states or TCI state pairs. For example, the base station may transmit multiple TCI states to the terminal via RRC signaling, and may set some of them as TCI states for CORESET. The terminal may receive an activation command. The activation command may be used to map TCI state(s) and / or TCI state pair(s) to codepoints in the DCI field 'transmission configuration indication'.

[0172] Additionally, as shown in FIG. 10 below, it can be set to set a beam by integrating multiple channels or reference signals through a unified TCI state.

[0173] Instead of transmitting the TCI state for each channel to the UE, the base station can transmit information about beam settings for CSI-RS, CORESET, PDSCH, PUSCH, PUCCH, SRS, etc. to the UE through the unified TCI state. Whether the unified TCI state is activated or not can be explicitly or implicitly transmitted to the UE. For example, if the BWP of the CC does not have a TCI-State or TCI-UL-State configuration, the UE can apply the TCI-State or TCI-UL-State configuration from the reference BWP of the reference CC configured by the unified TCI-StateRef.

[0174] A multiple transmission and reception point (M-TRP) technique can be proposed, in which communication is performed through multiple transmitting and receiving nodes. The M-TRP technique can be divided into a single control information technique (single downlink control information (S-DCI)) that controls transmission and reception through multiple nodes through a single control information, and a multiple downlink control information technique (multiple downlink control information (M-DCI)) that separately transmits information for each node. In addition, the procedure for transmitting TCI information may vary depending on whether TCI information for uplink and downlink is set separately or jointly.

[0175] FIG. 11 illustrates an example of a setup procedure of each layer for transmitting a TCI state in an M-TRP structure according to one embodiment of the present disclosure.

[0176] First, there are two types of configurations related to TCI: separate and joint. In the separate type, the TCI state is set through separate TCI state lists for uplink and downlink, respectively, while in the joint type, the TCI state is set through joint TCI state lists for uplink and downlink. The base station can convey the configuration type related to the unified TCI to the terminal through unifiedTCI-StateType in ServingCellConfig. In addition, the base station can convey information about the resource set for the reference signal to the terminal through PDSCH-Config, and PDSCH-Config can be included in the BWP-Downlink IE.

[0177] Additionally, the terminal can be configured with a list of up to 128 TCI state configurations via upper layer parameters (e.g., dl-OrJointTCI-StateList in PDSCH-Config). The TCI configuration list can be used to provide criteria for determining ULTX spatial filters for dynamic-grant and configured-grant based PUSCH and PUCCH resources and SRS in BWP / CC.

[0178] Among the TCI state settings, the TCI state settings that are activated can be transmitted through the TCI state enable / disable MAC CE. The integrated TCI state enable / disable MAC CE can be defined as follows.

[0179]

[0180]

[0181] The integrated TCI state enable / disable MAC CE can indicate the TCI state ID to be enabled. The integrated TCI state enable / disable MAC CE includes a serving cell ID, a DL BWP ID, and an UL BWP ID. It can indicate a serving cell and a BWP to which the MAC CE can be applied as a code point. The Pi field can indicate whether each ith code point includes multiple TCI states or a single TCI state. If Pi = 1, the ith TCI code point includes multiple TCI states, and if Pi = 0, the ith TCI code point can include only a DL / joint TCI state or only a UL TCI state.

[0182] The D / U field can indicate whether the TCI state corresponding to the TCI state ID existing in the same octet is a DL / joint TCI state or an UL TCI state. Therefore, in FIG. 11, the D / U field belonging to the same octet as a separate type of DL TCI state and a joint type of TCI state can be set to 1, and the D / U field belonging to the same octet as a separate type of UL TCI state can be set to 0.

[0183] An enhanced integrated TCI state enable / disable MAC CE for joint TCI states can be defined as follows.

[0184]

[0185] Unlike the integrated TCI state enable / disable MAC CE, the enhanced integrated TCI state enable / disable MAC CE for joint TCI states can jointly manage the TCI states of uplink and downlink, so the UL BWP ID can be omitted. The Fi,j field indicates whether the jth joint TCI state exists in the TCI state ID field associated with code point i of the DCI Transmission Configuration Indication field. Here, j can have the value 1 or 2. Therefore, in the case of the joint type as in step#2 of Fig. 11, up to two joint TCI states can correspond to each code point, and up to 16 joint TCI states can be activated.

[0186] An enhanced unified TCI state enable / disable MAC CE for separate TCI states can be defined as follows.

[0187]

[0188] Unlike the unified TCI state enable / disable MAC CE, the enhanced unified TCI state enable / disable MAC CE for separate TCI states may include an Fi,j field and a Si,j field. The Fi,j field indicates whether the jth DL TCI state exists in the TCI state ID field associated with the code point i of the DCI Transmission Configuration Indication field. The Si,j field indicates whether the jth UL TCI state exists in the TCI state ID field associated with the code point i of the DCI Transmission Configuration Indication field. Therefore, in the case of the separate type of step#2 of FIG. 11, since each code point can correspond to at most two DL TCI states and at most two UL TCI states, a maximum of 32 TCI states can be enabled.

[0189] A base station can transmit DCI to a terminal via a PDCCH. The DCI can include a transmission configuration indication field, and decoding can be performed using the TCI state corresponding to the code point i in the transmission configuration indication field included in the DCI. As described above, the correspondence between the code point i and the TCI state can be indicated by a TCI state activation command.

[0190] The terminal can use the TCI state as follows using the received DCI.

[0191]

[0192]

[0193] That is, when the terminal receives a single TCI state for a CORESET, or receives a MAC CE activation command for one or two of the TCI states provided for the CORSET, the terminal may assume that the DM-RS antenna ports associated with the PDCCH receptions within the CORESET are in a QCL relationship with one or more DL RSs established by the TCI states.

[0194] A TCI state can be indicated by splitting it into two states. For example, if the terminal is provided with dl-OrJointTCI-StateList, the TCI states can be indicated through a combination of two TCI states (the first TCI state, the second TCI state, the first TCI state and the second TCI state, none). For example, if the terminal indicates the first TCI state through apply-IndicatedTCISate, the terminal can assume that the reference signal provided by the first TCI state and the DM-RS antenna port for PDCCH reception are in a QCL relationship.

[0195] If dl-OrJointTCI-StateList is provided to the UE and coresetPoolIndex is not provided to the UE or coresetPoolIndex is provided with 0 for the first coreset in the active DL BWP of the serving cell, the UE may assume that the DM-RS antenna ports for PDCCH reception in the first and second coresets and the DM-RS antenna ports for PDSCH reception scheduled by the DCI formats provided by PDCCH reception in the first and second coresets are in a QCL relationship with the reference signals provided by the TCI states specific to the first and second CORESETs, respectively. Furthermore, the UE may transmit the PUSCH scheduled by the DCI formats provided by PDCCH reception in the first and second CORESETs, respectively, using the spatial domain filters corresponding to the TCI states specific to the first and second CORESETs, respectively.

[0196] The TCI state can be used to transmit uplink signals. The terminal can use the following procedures to control uplink power.

[0197]

[0198] Uplink power control can be used to determine power for PUSCH, PUCCH, SRS, or PRACH transmissions. The UE may be configured not to maintain more than four path loss estimates simultaneously for PUSCH / PUCCH / SRS transmissions per serving cell.

[0199] For PUSCH, PUCCH, SRS, or PRACH transmissions, a transmission opportunity can be defined by a slot index within a frame, the first symbol within the slot, and the number of consecutive symbols. If the UE receives TCI states in dl-OrJointTCI-StateList, an RS index for downlink path loss estimation for PUSCH, PUCCH, or SRS transmission can be provided for each one or both TCI states for PUSCH, PUCCH, or SRS transmission opportunities.

[0200] Power control values ​​can be set explicitly or implicitly. For example, if followUnifiedTCI-StateSRS is set, power control values ​​are provided from p0AlphaSetforSRS associated with the TCI state. If followUnifiedTCI-StateSRS is not set, power control values ​​and an RS index for path loss estimation can be provided from the TCI state associated with the SRS resource with the lowest SRS-ResourceId. In this case, the overall SRS power value can be determined based on the sum of individual SRS power control values ​​and additional components according to the SRS resource set.

[0201]

[0202] Hereinafter, the initial connection procedure between a terminal and a base station will be described. If the initial connection procedure is performed with the base station due to reasons such as the terminal's power on / off operation or loss of coverage, an identification procedure between the base station and the terminal may be required. First, the terminal may perform an initial cell search operation with the base station. The terminal may perform monitoring to receive a synchronization signal. The synchronization signal may be at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). The terminal may receive a physical broadcast channel (PBCH) signal from the base station to obtain broadcast information within the cell. Based on the physical broadcast channel, the terminal may obtain information about the cell using at least one of the MIB or SIB. A block including all of the PSS, SSS, and PBCH may be referred to as a synchronization signal block (SSB).

[0203] A terminal can perform a random access procedure. The terminal can transmit a preamble to the base station and receive a random access response (RAR) from the base station. The RAR message can include a temporary identifier. The terminal can transmit MSG3 (or an RRC connection request message) using the scheduling information in the RAR, and the base station can perform a contention resolution procedure by transmitting MSG4 (or a contention resolution message) to the terminal in response to MSG3.

[0204] The base station can perform beam management based on the RACH opportunity used for preamble transmission in the random access procedure. For example, the base station can determine the beam on which the terminal received the synchronization signal based on the RACH opportunity in which the preamble was transmitted. As described above, a synchronization signal can also be included as a reference signal for indicating the QCL relationship, and the QCL relationship can be established based on the SSB received through the initial access procedure.

[0205] Additionally, a channel measurement procedure may be performed for beam management. The terminal may receive a reference signal from the base station. Based on this, the terminal may report channel state information (CSI) to the base station. The channel state information may include at least one of reference signal received power (RSRP), reference signal received quality (RSRQ), and signal-to-noise ratio (SNR). The base station may use the received channel state information to adjust beamforming for the terminal or optimize radio resource allocation. For channel measurement, the base station may transmit configuration information for channel measurement to the terminal. The configuration information for channel measurement may include information related to a measurement target, a measurement cycle, and the like.

[0206] Base station and terminal beam settings can be managed through artificial intelligence (AI). For convenience, beam set B refers to the beam set where measurements are performed using AI / ML model input, and beam set A refers to the beam set determined based on AI / ML model inference. Beam sets A and B may contain beam information for the same frequency range.

[0207] Artificial intelligence can be used to infer spatial domain downlink beams for beam set A based on measurements of beam set B. As another example, artificial intelligence can be used to infer temporal downlink beams for beam set A based on past measurements of beam set B, where beam set A and beam set B may be different sets or beam set B may be a subset of beam set A.

[0208] Additionally, the input of the artificial intelligence model can be formed from various combinations. For example, the input of the artificial intelligence can include at least one of an L1-RSRP measurement based on beam set B, other auxiliary information, a channel impulse response (CIR) based on beam set B, and a downlink Tx / Rx beam ID associated with the L1-RSRP measurement of beam set B.

[0209] The aforementioned artificial intelligence model can be designed to infer a beam including at least one of a downlink reception beam and a downlink transmission beam. In addition, the output of the artificial intelligence model can include at least one of a transmission beam, a reception beam, an L1-RSRP of the transmission beam, an L1-RSRP of the reception beam, an angle of the transmission beam, an angle of the reception beam, and other information.

[0210] The beam management method using an AI model is not limited to the aforementioned method. The AI ​​model can be configured in various ways by configuring inputs and outputs with various combinations of settings for beam sets A and B, performance monitoring, data collection, and auxiliary information.

[0211] Learning and inference methods can also be implemented in various ways. For example, artificial intelligence can be learned or trained using an AI / ML (artificial intelligence / machine learning) model. Learning and training can be performed by the network or the UE. Furthermore, learning and inference can be performed on different devices. For example, learning can be performed on the network and inference on the UE. Split learning can be performed in such a way that some of the learning is performed on a first device and some on a second device. Similarly to learning, split inference can be performed using multiple devices. Input data for inference can also be generated in various ways. For example, input data can be generated on the UE, and inference can be performed using the input data on the network. Furthermore, input data generated on the UE can be used for inference within the UE.

[0212] In 3GPP NR, when transmitting uplink data and / or signals in a single uplink DCI-based single TRP or a single downlink DCI-based multi-TRP manner, an operation method for switching between the single TRP method and the multi-TRP method has not been developed, and no clear definition of operation and procedure have been established as a standard technology. In particular, the operation for switching the transmission method for transmitting an uplink physical channel from multi-TRP to single TRP and the operation for switching from a single TRP to multi-TRP may differ depending on the single TRP method applied to the uplink physical channel.

[0213] Here, the single TRP method may refer to a signal transmission method for transmitting and receiving control and / or data information between one UE and one TRP. On the other hand, the multi-TRP method may refer to a signal transmission method for transmitting and receiving control and / or data information between one UE and multiple TRPs. Therefore, the single DCI-based single TRP method may refer to a method for transmitting and / or receiving control information or data in a single TRP method based on one DCI or control information. On the other hand, the single DCI-based multi-TRP method may refer to a method for transmitting and / or receiving control information or data in a multi-TRP method based on one DCI or control information.

[0214] According to the present disclosure, in the process of transmitting an uplink signal, a switching operation between a single TRP method and a multiple TRP method based on a single DCI can be performed in the following manner.

[0215] FIG. 12 illustrates an example of a procedure for transmitting an uplink signal according to one embodiment of the present disclosure. FIG. 12 illustrates a method performed by a UE.

[0216] At step S1210, the UE may perform initial connection, connection establishment and setup procedures with the first TRP.

[0217] At step S1220, the UE can set the transmission method of the first uplink signal to a single TRP method.

[0218] At step S1230, the UE may transmit a first uplink signal to the first TRP in a single TRP manner. Here, the UE may transmit an uplink signal including a PUSCH and / or a PUCCH to the first TRP.

[0219] At step S1240, the first TRP may determine to switch the transmission method of the uplink signal. For example, the first TRP may determine to switch the transmission method of the UE's uplink signal based on information regarding the communication status with the UE.

[0220] At step S1250, the UE may receive a signal and / or message for switching the uplink signal transmission method from the first TRP. Here, the signal and / or message for switching the uplink signal transmission method may be transmitted in the form of MAC-CE, RRC, DCI, etc.

[0221] At step S1260, the UE can set the transmission method of the second uplink signal to the multi-TRP method.

[0222] At step S1270, the UE may transmit a second uplink signal to the first TRP and / or the second TRP in a multi-TRP manner. Here, the UE may transmit an uplink signal including a PUSCH and / or a PUCCH to the first TRP and / or the second TRP.

[0223] According to one embodiment of the present disclosure, the switching operation between the single-TRP scheme and the multi-TRP scheme can be independently applied to two physical channels. That is, the single-TRP scheme or the multi-TRP scheme can be applied to the PUCCH, and the single-TRP scheme or the multi-TRP scheme can be applied to the PUSCH.

[0224] According to another embodiment of the present disclosure, the switching operation between the single-TRP scheme and the multi-TRP scheme can be applied to both physical channels. That is, the single-TRP scheme or the multi-TRP scheme can be equally applied to the PUCCH and the PUSCH. Here, the PUCCH and PUSCH transmitted in the single-TRP scheme can be transmitted to at least one identical TRP. Alternatively, the PUCCH and PUSCH transmitted in the single-TRP scheme can be transmitted to at least one different TRP.

[0225] According to another embodiment of the present disclosure, the switching operation between the single-TRP scheme and the multi-TRP scheme can be applied to both physical channels. That is, the single-TRP scheme or the multi-TRP scheme can be applied equally to the PUCCH and PUSCH. Here, the PUCCH and PUSCH transmitted in the single-TRP scheme can only be transmitted to at least one identical TRP.

[0226] In the present disclosure, for convenience of explanation, the number of TRPs receiving signals using the multi-TRP method may be two. However, the contents proposed in the present invention may be applied in a simplified, expanded, modified, or combined form to operations in a communication system including two or more TRPs.

[0227] The method of setting the transmission method of PUSCH based on a single DCI to a single TRP method or a multiple TRP method can be as described below.

[0228] In the process of setting the transmission method of PUSCH, two joint / uplink TCI states can be indicated through MAC-CE and / or downlink DCI. In addition, the DCI for scheduling PUSCH can include an SRS resource set indicator. The SRS resource set indicator can indicate a TCI state used for transmitting PUSCH. For example, the SRS resource set indicator can indicate application of a first TCI state, a second TCI state, or both TCI states. In addition, based on the TCI state indicated by the SRS resource set indicator in the DCI for scheduling PUSCH, the transmission method of PUSCH can be set to a single TRP method or a multi-TRP method.

[0229] Here, the DCI indicating two joint / uplink TCI states may be a downlink DCI including a TCI state field, i.e., DCI 1_1 or DCI 1_2. And, the uplink DCI scheduling the PUSCH may be DCI 0_1 or 0_2 including scheduling information for the PUSCH. That is, the two joint / uplink TCI states may be indicated by DCI 1_1 or DCI 1_2 received before receiving DCI 0_1 or DCI 0_2.

[0230] The present disclosure proposes an embodiment for switching the signal transmission method of uplink channels between a single TRP method and a multi-TRP method based on the above-described content, as follows.

[0231] According to one embodiment of the present invention, the switching operation between the single-TRP scheme and the multi-TRP scheme can be independently applied to both physical channels, PUCCH and PUSCH. That is, either the single-TRP or multi-TRP scheme can be applied to the PUCCH, and either the single-TRP or multi-TRP scheme can be applied to the PUSCH.

[0232] In this case, single-TRP and multi-TRP schemes can be independently applied to PUCCH and PUSCH, respectively. For example, a UE can transmit PUCCH using multi-TRP scheme and PUSCH using single-TRP scheme. Alternatively, a UE can transmit PUCCH using single-TRP scheme and PUSCH using multi-TRP scheme.

[0233] In one embodiment, when both the PUCCH and the PUSCH are transmitted in a single TRP manner, the PUCCH and the PUSCH may be transmitted in the same TRP. Conversely, in another embodiment, when both the PUCCH and the PUSCH are transmitted in a single TRP manner, the PUCCH and the PUSCH may be transmitted in different TRPs.

[0234] According to one embodiment, when both PUCCH and PUSCH are transmitted in a multi-TRP manner, PUCCH and PUSCH may be transmitted in the same two TRPs. According to another embodiment, when both PUCCH and PUSCH are transmitted in a multi-TRP manner, PUCCH and PUSCH may be transmitted in two different TRPs. According to yet another embodiment, when both PUCCH and PUSCH are transmitted in a multi-TRP manner, at least one TRP for receiving PUCCH and PUSCH may be the same, but the remaining TRPs for receiving PUCCH and PUSCH may be different.

[0235] Here, when PUCCH and PUSCH are transmitted to the same TRP, the same TCI state may be applied during the PUCCH and PUSCH transmissions. Conversely, when PUCCH and PUSCH are transmitted to different TRPs, different TCI states may be applied during the PUCCH and PUSCH transmissions.

[0236] In the process of switching the transmission method of PUSCH to single TRP method or multi-TRP method, MAC-CE and / or downlink DCI may indicate two joint / uplink TCI states. In addition, the uplink DCI for scheduling the PUSCH may include an SRS resource indicator indicating a TCI state used for transmitting the PUSCH among the two joint / uplink TCI states indicated by the MAC-CE and / or downlink DCI. When the SRS resource indicator set of the uplink DCI is '00', the first TCI state may be used. When the SRS resource indicator set of the uplink DCI is '10', the second TCI state may be used. When the SRS resource indicator set of the uplink DCI is '10' or '11', two TCI states may be used.

[0237] And, the method of switching between the single TRP scheme and the multi-TRP scheme for PUCCH may be as described below.

[0238] FIG. 13 illustrates an example of a procedure for setting a signal transmission method of an uplink shared channel signal and an uplink control channel signal and transmitting the signals according to one embodiment of the present disclosure. FIG. 13 illustrates a method performed by a UE.

[0239] At step S1310, the UE may receive a higher layer signal from the first TRP. Here, the higher layer signal may be a message and / or signal including information such as MAC-CE, RRC parameters, etc.

[0240] At step S1320, the UE may receive DCI from the first TRP. Here, the DCI may be uplink DCI and / or downlink DCI.

[0241] At step S1330, the UE may configure the signal transmission method of the uplink shared channel based on the upper layer signal and DCI. The UE may configure the signal transmission method of the uplink shared channel as a single TRP method or a multi-TRP method based on the upper layer signal and / or DCI. For example, the signal transmission method of the uplink shared channel may be configured based on the information of the upper layer signal and the TCI state indicated by the DCI.

[0242] In step S1340, the UE may transmit an uplink shared channel signal to at least one TRP. If the signal transmission method of the uplink shared channel signal is a single TRP method, the UE may transmit the uplink shared channel signal to the first TRP or the second TRP. On the other hand, if the signal transmission method of the uplink shared channel signal is a multi-TRP method, the UE may transmit the uplink shared channel signal to the first TRP and / or the second TRP.

[0243] At step S1350, the UE can configure the signal transmission method of the uplink control channel based on the upper layer signal and DCI. The UE can configure the signal transmission method of the uplink control channel as a single TRP method or a multi-TRP method based on the upper layer signal and / or DCI. For example, the signal transmission method of the uplink control channel can be configured based on the information of the upper layer signal and the TCI state indicated by the DCI.

[0244] In step S1360, the UE may transmit an uplink control channel signal to at least one TRP. If the signal transmission method of the uplink control channel signal is a single TRP method, the UE may transmit the uplink control channel signal to the first TRP or the second TRP. On the other hand, if the signal transmission method of the uplink control channel signal is a multi-TRP method, the UE may transmit the uplink control channel signal to the first TRP and / or the second TRP.

[0245] According to one embodiment of the present invention, PUCCH can be transmitted using PUCCH resources and / or TCI states set for each group by RRC and / or MAC-CE.

[0246] When RRC or MAC-CE indicates a single TCI state, the UE can transmit PUCCH to a single TRP. In this case, a single TCI state can be configured for a single PUCCH resource and / or group.

[0247] When RRC or MAC-CE indicates two TCI states, the UE can transmit PUCCH to each of the TRPs by applying different TCI states. The two PUCCHs can be transmitted using SDM, TDM, FDM, or SFN techniques. Here, two joint / uplink TCI states can be configured and operated for one PUCCH resource and / or group. Alternatively, one joint / uplink TCI state can be configured and operated for different PUCCH resources and / or groups. That is, the two TCI states indicated through RRC or MAC-CE can be configuration information for one PUCCH resource and / or group. Alternatively, the two TCI states indicated through RRC or MAC-CE can be configuration information for each of two different PUCCH resources and / or groups.

[0248] FIG. 14 illustrates an example of a procedure for setting a signal transmission method of an uplink control channel based on a TCI state indicated by a higher layer signal according to one embodiment of the present disclosure. FIG. 14 illustrates a method performed by a UE.

[0249] At step S1410, the UE may set a TCI state indicated by a higher layer signal. The TCI state may be set by a higher layer signal, per uplink control channel resource and / or per group. Here, the higher layer signal may be a signal such as MAC-CE or RRC. The higher layer signal may indicate one or two TCI states.

[0250] At step S1420, the UE can configure the signal transmission method of the uplink control channel signal based on the configured TCI state. If the upper layer signal indicates one TCI state, the UE can configure the signal transmission method of the uplink control channel signal to a single TRP method. Conversely, if the upper layer signal indicates two TCI states, the UE can configure the signal transmission method of the uplink control channel signal to a multi-TRP method.

[0251]

[0252] In step S1430, the UE may transmit an uplink control channel signal to the TRP according to the configured signal transmission method. If the signal transmission method of the uplink control channel signal is a single TRP method, the UE may transmit the uplink control channel signal to the first TRP or the second TRP. On the other hand, if the signal transmission method of the uplink control channel signal is a multi-TRP method, the UE may transmit the uplink control channel signal to the first TRP and / or the second TRP. That is, the UE may transmit the uplink control channel signal based on the TCI state indicated by the upper layer signal.

[0253] According to another embodiment of the present invention, when a communication system operates the TCI states for UL and DL in a unified TCI state manner, the TCI state applied to the PUCCH can be set by the RRC. Here, the MAC-CE and / or the downlink DCI can indicate and / or activate two joint / uplink TCI states, and the RRC can indicate one or more TCI states among the two joint / uplink TCI states. That is, the RRC can indicate whether, among the two joint / uplink TCI states, the first TCI state or the second TCI state is applied for transmitting the PUCCH, whether both the first TCI state and the second TCI state are applied, or whether neither the first TCI state nor the second TCI state is applied. In addition, the UE can set the TCI state applied for transmitting the PUCCH through the RRC.

[0254] If RRC indicates to use the first or second TCI state, the UE may transmit PUCCH to a single TRP in a single TRP manner. In this case, the TCI state indicated by RRC may be configured to include mapping information with a specific PUCCH resource and / or group.

[0255] If the RRC signal and / or parameters indicate that two TCI states are to be used, the UE may transmit PUCCH to two different TRPs, respectively. In this case, the two PUCCHs may be transmitted using SDM, TDM, FDM, or SFN techniques. On the other hand, if the RRC signal and / or parameters indicate that neither of the two TCI states is to be used, the UE may expect to receive TCI state indication information via RRC and / or MAC-CE. Alternatively, the UE may transmit PUCCH using the TCI state(s) indicated by the most recently received RRC or MAC-CE. Alternatively, the UE may transmit PUCCH using the TCI state(s) used for the most recent PUCCH transmission. Alternatively, the UE may transmit PUCCH using a combination of the above-described methods. That is, if information indicating a transmission method of an uplink signal is not obtained through RRC or MAC-CE, the UE may transmit a PUCCH by applying the TCI state(s) indicated through the most recently received RRC or MAC-CE or the TCI state(s) used to transmit the most recent PUCCH.

[0256] Here, the two joint / uplink TCI states indicated by the MAC-CE / downlink DCI can be set for each PUCCH resource and / or group. Alternatively, the two joint / uplink TCI states indicated by the MAC-CE / downlink DCI can be set identically for all PUCCH resources and / or groups. Here, the PUCCH and PUSCH transmitted in a multi-TRP manner can be transmitted using SDM, TDM, FDM, or SFN techniques.

[0257] Based on the multi-TRP scheme, when transmitting PUCCH using SDM, SFN, and FDM techniques, the UE can transmit PUCCH simultaneously by always mapping two indicated joint / uplink TCI states to one PUCCH resource and / or group.

[0258] The embodiment described above may be an embodiment that transmits PUCCH and PUSCH based on two joint / uplink TCI states indicated by downlink DCI including a TCI state field. However, if the TCI state field is defined by uplink DCI, or at least two joint / uplink TCI states are indicated through uplink DCI, the downlink DCI of the embodiment described above may be replaced with uplink DCI. The same modified and extended form may be applied to other embodiments of the present disclosure.

[0259] FIG. 15 illustrates an example of a procedure for setting a signal transmission method of an uplink control channel based on a TCI state set by RRC according to one embodiment of the present disclosure. FIG. 15 illustrates a method performed by a UE.

[0260] At step S1510, the UE may configure a TCI state set indicated by a higher layer signal and / or downlink DCI. The higher layer signal and / or downlink DCI may indicate a TCI set including one or more TCI states. Here, the higher layer signal may be a signal such as MAC-CE.

[0261] At step S1520, the UE may set a TCI state indicated by RRC among a set of TCI states indicated by upper layer signaling and / or downlink DCI.

[0262] At step S1530, the UE can configure the signal transmission method of the uplink control channel signal based on the configured TCI state. If the RRC indicates one TCI state among the TCI state sets, the UE can transmit the uplink control channel signal to the TRP in a single TRP manner. On the other hand, if the RRC indicates multiple TCI states among the TCI state sets, the UE can transmit the uplink control channel signal to at least one TRP(s) in a multi-TRP manner.

[0263] According to another embodiment of the present invention, the switching operation between single-TRP mode and multi-TRP mode can be applied to both physical channels, PUCCH and PUSCH. That is, both PUCCH and PUSCH can be transmitted in single-TRP mode or both can be transmitted in multi-TRP mode. In this case, when PUCCH and PUSCH are transmitted in single-TRP mode, the UE can transmit PUCCH and PUSCH to different TRPs. Alternatively, when PUCCH and PUSCH are transmitted in single-TRP mode, the UE can transmit PUCCH and PUSCH to the same TRP.

[0264] FIG. 16 illustrates an example of a procedure for transmitting signals by setting the signal transmission method of an uplink shared channel signal and an uplink control channel signal to be the same according to one embodiment of the present disclosure. FIG. 16 illustrates a method performed by a UE.

[0265] At step S1610, the UE may receive a higher layer signal from the first TRP. Here, the higher layer signal may be a message and / or signal including information such as MAC-CE, RRC parameters, etc.

[0266] At step S1620, the UE may receive DCI from the first TRP. Here, the DCI may be uplink DCI and / or downlink DCI.

[0267] At step S1630, the UE may configure the signal transmission method of the uplink shared channel to be either a multi-TRP method or a single-TRP method based on higher layer signals and DCI. The UE may configure the signal transmission method of the uplink shared channel to be either a single-TRP method or a multi-TRP method based on higher layer signals and / or DCI. For example, the signal transmission method of the uplink shared channel may be configured based on information in higher layer signals and the TCI state indicated by the DCI.

[0268] In step S1640, the UE may transmit an uplink shared channel signal to at least one TRP. If the signal transmission method of the uplink shared channel signal is a single TRP method, the UE may transmit the uplink shared channel signal to the first TRP or the second TRP. On the other hand, if the signal transmission method of the uplink shared channel signal is a multi-TRP method, the UE may transmit the uplink shared channel signal to the first TRP and / or the second TRP.

[0269] At step S1650, the UE can set the signal transmission method of the uplink control channel to be the same as the signal transmission method of the uplink shared channel signal based on the upper layer signal and DCI.

[0270] In step S1660, the UE may transmit an uplink control channel signal to at least one TRP. If the signal transmission method of the uplink control channel signal is a single TRP method, the UE may transmit the uplink control channel signal to the first TRP or the second TRP. On the other hand, if the signal transmission method of the uplink control channel signal is a multi-TRP method, the UE may transmit the uplink control channel signal to the first TRP and / or the second TRP.

[0271] After the transmission method of PUSCH is set to the multi-TRP method, the method of setting the transmission method of PUCCH to the multi-TRP method can be as described below.

[0272] In the process of configuring the transmission method of PUSCH, two joint / uplink TCI states can be indicated by the TCI state field of downlink DCI. In addition, if the value of the SRS resource set indicator in the uplink DCI that schedules the PUSCH is set to '10' or '11', the SRS resource set indicator in the uplink DCI can indicate that the PUSCH is transmitted using two joint / uplink TCI states. In this case, the UE can transmit the PUCCH using two TRPs after transmitting the corresponding PUSCH. That is, after transmitting the PUSCH using the multi-TRP method, the UE can also transmit the PUCCH using the multi-TRP method. In order to configure the PUCCH transmission method to the multi-TRP method, an RRC configuration signal and / or parameter can indicate that both joint / uplink TCI states are applied. In this case, the RRC can be configured to include mapping information between the two TCI states and specific PUCCH resources and / or groups. For example, two TCI states may be mapped and operated with a single PUCCH resource and / or group. Alternatively, two TCI states may be mapped and operated with different PUCCH resources and / or groups.

[0273] After the UE transmits the PUSCH in a multi-TRP manner, the UE may receive an RRC signal and / or parameter indicating that the transmission manner of the PUCCH is to be switched to the multi-TRP. Here, the RRC signal and / or parameter may indicate that two TCI states are to be applied for the transmission of the PUCCH. However, if the RRC signal and / or parameter includes information indicating that one TCI state is to be applied for the transmission of the PUCCH or information indicating that none of the TCI states are to be applied, the UE may transmit the PUCCH in a multi-TRP manner by applying two joint / DL TCI states indicated through the TCI state field in the downlink DCI. In this case, the mapping information between the TCI states and the PUCCH resources and / or groups may be set identically to the configured information indicated through the existing RRC / MAC-CE. Alternatively, the mapping information between the TCI states and the PUCCH resources and / or groups may follow the configured information indicated by the current RRC / MAC-CE.

[0274] If the uplink DCI scheduling the PUSCH does not include an SRS resource set indicator, the UE can transmit the PUSCH using two joint / uplink TCI states indicated by the TCI state field of the downlink DCI. After transmitting the corresponding PUSCH or after receiving the corresponding uplink DCI, the UE can transmit the PUCCH in two TRPs based on the two TCI states. That is, after transmitting the PUSCH in a multi-TRP manner, the UE can also switch the transmission mode of the PUCCH to the multi-TRP manner. In order to switch the transmission mode of the PUCCH to the multi-TRP manner, the UE can obtain information indicating to apply both joint / uplink TCI states through an RRC configuration parameter and / or signal. However, if the RRC parameters and / or signals include information indicating that one TCI state is to be applied, or information indicating that none of the TCI states is to be applied, the UE may transmit a PUCCH by applying two joint / DL TCI states indicated through the TCI state field in the downlink DCI. In this case, the mapping information between the TCI states and the PUCCH resources and / or groups may be set identically to the configured information indicated through the existing RRC / MAC-CE. Alternatively, the mapping information between the TCI states and the PUCCH resources and / or groups may follow the configured information indicated by the current RRC / MAC-CE.

[0275] In the above method, PUCCH and PUSCH transmitted in a multi-TRP manner can be transmitted using SDM, TDM, FDM, or SFN techniques.

[0276] After the transmission method of PUSCH is set to the single TRP method, the method of setting the transmission method of PUCCH to the single TRP method can be as described below.

[0277] In the process of setting the transmission method of PUSCH, two joint / uplink TCI states can be indicated through the TCI state field of downlink DCI. In addition, if the value of the SRS resource set indicator of uplink DCI is set to '00' or '01', the SRS resource set indicator can indicate that the PUSCH is transmitted using the first or second TCI state among the two joint / uplink TCI states.

[0278] When a UE that has transmitted a PUSCH transmits a PUCCH, the UE can transmit the PUCCH to a single TRP by applying a single TCI state. In other words, after transmitting the PUSCH in a single TRP manner, the UE can also transmit the PUCCH in a single TRP manner.

[0279] A UE transmitting a PUCCH in a single TRP manner can obtain information indicating whether to apply the first or second TCI state among two joint / uplink TCI states through RRC configuration information. If information indicating to apply two TCI states or not to apply all TCI states is received through RRC, the UE may attempt to transmit a PUCCH by applying the first TCI state among the two joint / uplink TCI states indicated through the TCI state field of the downlink DCI. Alternatively, the UE may attempt to transmit a PUCCH by applying the second TCI state among the two joint / DL TCI states indicated through the TCI state field of the downlink DCI. Alternatively, among the two joint / uplink TCI states indicated through the TCI state field in the downlink DCI, the joint / uplink TCI state applied for transmitting a PUSCH according to the SRS resource set indicator of the uplink DCI may be applied in the same manner to transmit a PUCCH. That is, the UE can operate by applying the instructions of the SRS resource set indicator in the uplink DCI to PUCCH transmission.

[0280] FIG. 17 illustrates an example of a procedure for setting a signal transmission method of an uplink shared channel signal and an uplink control channel signal according to one embodiment of the present disclosure. FIG. 17 illustrates a method performed by a UE.

[0281] At step S1710, the UE may set a TCI state indicated by the downlink DCI. Here, the downlink DCI may indicate two TCI states.

[0282] At step S1720, the UE may set a TCI state based on the uplink DCI. Here, the uplink DCI may indicate one or more TCI states among the two TCI states indicated by the downlink DCI.

[0283] At step S1730, the UE can set the signal transmission method of the uplink shared channel signal by applying the set TCI state. Here, the signal transmission method of the uplink shared channel can be set based on the TCI state indicated by the uplink DCI and the downlink DCI.

[0284] At step S1740, the UE may configure a TCI state based on RRC. RRC may indicate which TCI state to use among the two TCI states indicated by the downlink DCI. If RRC indicates a TCI state, the UE may configure the TCI state to the TCI state indicated by RRC.

[0285] In another embodiment, when RRC indicates two TCI states or does not indicate any TCI state, the UE may set the TCI state to one of the two TCI states indicated by the downlink DCI. Alternatively, when RRC indicates two TCI states or does not indicate any TCI state, the UE may set the TCI state to a TCI state indicated by an SRS resource set indicator included in the uplink DCI, among the two TCI states indicated by the downlink DCI.

[0286] In step S1750, the UE can set a signal transmission method of an uplink control channel signal by applying the set TCI state. Here, the signal transmission method of the uplink control channel can be set based on the TCI state indicated by the uplink RRC. According to another embodiment, the UE can set a signal transmission method of an uplink control channel signal by applying the TCI state set in step S1740. According to another embodiment of the present invention, the switching operation between the single TRP method and the multiple TRP method can be defined and operated so that both the PUCCH and the PUSCH transmit and receive data / signals with the same single TRP or transmit and receive data / signals with multiple identical TRPs.

[0287] After the transmission method of PUSCH is set to the multi-TRP method, the method of setting the transmission method of PUCCH to the multi-TRP method can be as described below.

[0288] According to an embodiment of the present disclosure, when a PUSCH is transmitted in a multi-TRP manner according to the embodiment described above, a UE that has transmitted a PUSCH can transmit a subsequent PUCCH to one or more TRP(s) in a multi-TRP manner.

[0289] According to another embodiment of the present disclosure, since the PUCCH is transmitted to the same one or more TRP(s), the PUCCH can be transmitted in a multi-TRP manner based on the SRS resource set indicator of the uplink DCI instead of the configuration information for the RRC. For example, if the value of the SRS resource set indicator of the uplink DCI is set to '10' or '11', the UE can transmit the PUCCH using two joint / uplink TCI states. In this case, mapping information between the TCI states and the PUCCH resources and / or groups can be configured through the RRC or MAC-CE.

[0290] After the transmission method of PUSCH is set to a single TRP method, the method of setting the transmission method of PUCCH to a single TRP can be as described below.

[0291] In the process of configuring the transmission method of the PUSCH, the UE can receive a downlink DCI. Here, the TCI state field of the downlink DCI can indicate two joint / uplink TCI states. In addition, the UE can receive an uplink DCI. If the value of the SRS resource set indicator of the uplink DCI is set to '00' or '01', the SRS resource set indicator can indicate to transmit the PUSCH using the first or second TCI state among the two joint / uplink TCI states. After transmitting the PUSCH and receiving the uplink DCI, the UE can transmit the PUCCH by applying the TCI state used for the PUSCH transmission. That is, a UE that transmits a PUSCH using a single TRP method can transmit a PUCCH to the same TRP using the same single TRP method. In this case, the TCI state configuration information for the PUCCH of the RRC acquired before the PUSCH transmission time or before the uplink DCI reception time can be ignored.

[0292] In addition, after the UE transmits the PUSCH in the single TRP manner in the above operation, the UE may transmit the PUCCH by applying the TCI state indicated by the RRC configuration or the TCI state indicated by the MAC-CE configuration. Alternatively, if the UE has configured one TCI state information regarding the single TRP transmission manner of the PUCCH by the RRC or MAC-CE, the UE may transmit the PUCCH by applying the TCI state indicated by the RRC configuration or the TCI state indicated by the MAC-CE configuration. In other words, the UE may transmit the PUCCH by applying the most recently configured TCI state configuration information.

[0293] FIG. 18 illustrates an example of a procedure for setting a signal transmission method of an uplink shared channel signal and an uplink control channel signal according to one embodiment of the present disclosure. FIG. 18 illustrates a method performed by a UE.

[0294] At step S1810, the UE can set a TCI state indicated by the downlink DCI. Here, the downlink DCI can indicate two TCI states.

[0295] At step S1820, the UE may set a TCI state based on the uplink DCI indicating the TCI state to be used. Here, the uplink DCI may indicate one or more TCI states among the two TCI states indicated by the downlink DCI.

[0296] At step S1830, the UE can set the signal transmission method of the uplink shared channel signal and the uplink control channel signal by applying the set TCI state. Here, the signal transmission method of the uplink shared channel and the uplink control channel can be set based on the TCI state indicated by the uplink DCI and the downlink DCI. Accordingly, the UE can transmit the uplink shared channel and the uplink control channel by setting the signal transmission method of the uplink control channel to be the same as the signal transmission method of the uplink shared channel.

[0297] According to another embodiment of the present disclosure, when switching between a single-TRP scheme and a multi-TRP scheme, the single-TRP scheme or the multi-TRP scheme can be independently switched for PUCCH and PUSCH. In this case, the UE can set the transmission scheme of PUCCH and PUSCH to the single-TRP scheme or the multi-TRP scheme based on additional configuration information for the switching operation, and transmit an uplink signal to the same TRP.

[0298] Here, if the value of the SRS resource set indicator of the uplink DCI is '10', two TCI states can be applied to the PUSCH transmission. On the other hand, if the value of the SRS resource set indicator of the uplink DCI is '11', the TCI state used for the PUSCH transmission can be applied identically to the PUCCH transmission transmitted thereafter.

[0299] In this case, the value '11' of the field for selecting a TCI state can be mapped to one of the following: applying the first TCI state, applying the second TCI state, or applying both TCI states. The mapping information for the value of the field for selecting a TCI state can be configured by RRC or MAC-CE. That is, among the two joint / uplink TCI states indicated by the TCI state field of the downlink DCI, the first, second, or all TCI state(s) can be applied to the transmission of the PUCCH, depending on the configured value mapped to the '11' code point of the field for selecting a TCI state.

[0300] Here, if the value of the field for selecting a TCI state is '11', PUCCH and PUSCH can be transmitted to the same TRP(s). Here, the same TRP(s) for transmitting and receiving PUCCH and PUSCH can be distinguished based on the positions of the first TCI state and the second TCI state mapped to the code point of the TCI state field.

[0301] On the other hand, if the value of the field for selecting the TCI state is not '11', the value of the field for selecting the TCI state can only indicate the transmission method of the PUSCH. The transmission method of the PUCCH can be configured with the TCI state configuration information set by RRC. Accordingly, the transmission methods of the PUCCH and PUSCH can be independently configured as a single TRP or multiple TRP method.

[0302] According to one embodiment of the present invention, a switching method between a single TRP scheme and a multi-TRP scheme using uplink DCI without an SRS resource set indicator may be as described below.

[0303] If the uplink DCI does not include an SRS resource set indicator, the UE may set the transmission mode of the uplink signal to single TRP or multi-TRP mode based on the joint / uplink TCI state(s) indicated by the TCI state field of the downlink DCI received prior to receiving the uplink DCI.

[0304] If the TCI status field of the downlink DCI indicates one TCI state, the TCI status field may indicate the uplink signal transmission method as a single TRP method. On the other hand, if the TCI status field of the downlink DCI indicates two TCI states, the TCI status field may indicate the uplink signal transmission method as a multi-TRP method. According to one embodiment, the TCI state configuration information of the TCI status field may be applied only to the transmission process of the PUSCH.

[0305] On the other hand, according to another embodiment, the TCI state configuration information in the TCI state field can also be applied to the PUCCH transmission process. In this case, after receiving an uplink DCI or transmitting a PUSCH scheduled by an uplink DCI, the UE can transmit the PUCCH in a single TRP or multi-TRP manner by applying the TCI state configuration used for transmitting the PUSCH.

[0306] Here, only when TCI state configuration information for PUCCH transmission is not transmitted via RRC / MAC-CE, PUCCH may be transmitted by applying the TCI state indicated via the TCI state field. Alternatively, after applying the TCI state to PUSCH, the indicated TCI state may be applied only during the PUCCH transmission process within a preset offset.

[0307] Here, the uplink DCI may include one SRI (SRS Resource Indicator) field and one TPMI (Transmitted Precoding Matrix Indicator) field. In this case, the PUSCH and / or PUCCH may be transmitted by applying the values ​​indicated by the SRI and / or one TPMI field.

[0308] Here, the uplink DCI may include two SRI and two TPMI fields. In addition, if the code point indicated by the TCI state field of the downlink DCI is mapped to two joint / uplink TCI states, the first joint / uplink TCI state may not be mapped to any TCI state, and the second TCI state may be mapped to a specific TCI state. In this case, the PUSCH and / or PUCCH may be transmitted by applying the values ​​of the second SRI and the second TPMI fields. Conversely, if the code point indicated by the TCI state field in the downlink DCI is mapped to two joint / uplink TCI states, the first joint / uplink TCI state may be mapped to a specific TCI state, but the second TCI state may not be mapped to any TCI state. In this case, the PUSCH and / or PUCCH may be transmitted by applying the values ​​of the first SRI and the first TPMI fields.

[0309] FIG. 19 illustrates an example of a procedure for setting a transmission method of an uplink signal based on the presence or absence of an SRS resource set indicator in an uplink DCI according to one embodiment of the present disclosure. FIG. 19 illustrates a method performed by a UE.

[0310] At step S1910, the UE can determine whether an SRS resource set indicator is present in the uplink DCI.

[0311] If an SRS resource set indicator is present in the uplink DCI, the UE may set a TCI state based on the uplink DCI at step S1921. Here, the uplink DCI may indicate one or more TCI states among the two TCI states indicated by the previously received downlink DCI.

[0312] In step S1931, the UE can configure the signal transmission method of the uplink shared channel signal and the uplink control channel signal by applying the configured TCI state. Specifically, the UE can configure the signal transmission method of the uplink shared channel signal and the uplink control channel signal by applying the configured TCI state based on the uplink DCI. Here, the UE can configure the signal transmission method of the uplink shared channel signal by applying the configured TCI state based on the RRC.

[0313] On the other hand, if there is no SRS resource set indicator in the uplink DCI, in step S1922, the UE may set a TCI state based on the downlink DCI. Here, the downlink DCI may indicate one or more TCI states.

[0314] At step S1932, the UE may transmit an uplink shared channel signal and an uplink control channel signal to the TRP by applying the configured TCI state. Specifically, the UE may transmit an uplink shared channel signal and an uplink control channel signal to the TRP by applying the configured TCI state based on the downlink DCI.

[0315] According to an embodiment of the present disclosure, if there is no TCI state configuration command (e.g., TCI state configuration information transmitted via RRC, MAC-CE, DCI, etc.) for configuring the transmission mode of PUCCH and PUSCH to a single-TRP mode or a multi-TRP mode, the UE may maintain the configuration of the existing TCI state. Alternatively, if an instruction to maintain the current TCI state for a certain period of time is instructed via RRC, MAC-CE, DCI, or a combination thereof, the UE may maintain the configuration of the existing TCI state. In this case, configuration information for the certain period of time for maintaining the TCI state configuration may be instructed to the UE. In addition, maintaining the existing TCI state configuration may operate by operating the existing transmission mode without switching the transmission mode of PUCCH and PUSCH to a single-TRP mode or a multi-TRP mode.

[0316] Additionally, when TCI state setting information is transmitted through signaling indicating existing TCI state setting, the UE can release the maintenance of the existing TCI state setting and transmit PUCCH and PUSCH in a single TRP and multi-TRP manner according to the indicated TCI state setting information.

[0317] FIG. 20 illustrates an example of a procedure for setting a transmission method of an uplink signal according to one embodiment of the present disclosure. FIG. 20 illustrates a method performed by a UE.

[0318] At step S2010, the UE can receive upper layer signals and at least one DCI from the TRP.

[0319] In step S2020, the UE may set the signal transmission method of the uplink shared channel to one of a single-TRP (sTRP) transmission method and a multi-TRP (mTRP) transmission method based on a higher layer signal and at least one DCI.

[0320] At step S2030, the UE may set the signal transmission method of the uplink control channel to one of a single TRP transmission method and a multiple TRP transmission method based on at least one of a higher layer signal and at least one DCI.

[0321] At step S2050, the UE can transmit an uplink shared channel signal and an uplink control channel signal to the TRP according to the configured signal transmission method.

[0322] Here, the signal transmission method of the uplink shared channel can be set based on the method indicated by the SRS (sounding reference signal) resource set indicator of the uplink DCI.

[0323] Here, the signal transmission method of the uplink control channel and the signal transmission method of the uplink shared channel can be set independently of each other.

[0324] Here, the signal transmission method of the uplink control channel can be set based on a transmission configuration indicator (TCI) status indicator indicated by the upper layer signal.

[0325] Here, the signal transmission method of the uplink control channel can be set based on TCI status-related information of the RRC (radio resource control) signal.

[0326] Here, the signal transmission method of the uplink control channel can be set to be the same as the signal transmission method of the uplink shared channel.

[0327] Here, when the value of the SRS resource set indicator of the uplink DCI is a predetermined value, the signal transmission method of the uplink control channel can be set to be the same as the signal transmission method of the uplink shared channel.

[0328] Here, if the uplink DCI does not include an SRS resource set indicator, the signal transmission method of the uplink shared channel can be set based on the method indicated by the TCI status related information of the downlink DCI transmitted before the uplink DCI.

[0329] Meanwhile, the TRP can receive a signal transmitted in a transmission method corresponding to the steps described in FIG. 20.

[0330] The operations of the method according to 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.

[0331] 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.

[0332] 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.

[0333] 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 in the present disclosure. The field-programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described in the present disclosure. In general, the methods are preferably performed by some hardware device.

[0334] 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.

[0335] The present invention can be used in a device and a transmitter / receiver for transmitting and receiving signals.

Claims

1. In a method of operating a terminal in a wireless communication system, A step of receiving an upper layer signal and at least one DCI (downlink control information) from a TRP (transmission reception point); A step of setting a signal transmission method of an uplink shared channel to one of a single-TRP (sTRP) transmission method and a multi-TRP (mTRP) transmission method based on the upper layer signal and at least one DCI; A step of setting a signal transmission method of an uplink control channel to one of a single TRP transmission method and a multi-TRP transmission method based on at least one of the above upper layer signal and the at least one DCI; and A method comprising the step of transmitting an uplink shared channel signal and an uplink control channel signal to the TRP according to a set signal transmission method.

2. In claim 1, A method, characterized in that the signal transmission method of the above uplink shared channel is set based on a method indicated by an SRS (sounding reference signal) resource set indicator of uplink DCI.

3. In claim 2, A method, characterized in that the signal transmission method of the uplink control channel and the signal transmission method of the uplink shared channel are set independently of each other.

4. In claim 3, A method, characterized in that the signal transmission method of the above uplink control channel is set based on a transmission configuration indicator (TCI) status indicator indicated by the upper layer signal.

5. In claim 3, The signal transmission method of the above uplink control channel is: A method characterized in that it is set based on TCI status related information of an RRC (radio resource control) signal.

6. In claim 2, A method, characterized in that the signal transmission method of the above uplink control channel is set to be the same as the signal transmission method of the above uplink shared channel.

7. In claim 6, If the value of the SRS resource set indicator of the above uplink DCI is a predetermined value, A method, characterized in that the signal transmission method of the above uplink control channel is set to be the same as the signal transmission method of the above uplink shared channel.

8. In claim 6, If the above uplink DCI does not include an SRS resource set indicator, A method, characterized in that the signal transmission method of the above uplink shared channel is set based on a method indicated by TCI status related information of downlink DCI transmitted before the uplink DCI.

9. In a method of operating a TRP (transmission reception point) in a wireless communication system, A step of transmitting an upper layer signal and at least one DCI (downlink control information) to a terminal; A step of receiving an uplink shared channel signal from the terminal; and Comprising a step of receiving an uplink control channel signal from the terminal, A method, characterized in that the signal transmission method of the uplink shared channel and the signal transmission method of the uplink control channel are set to one of a single-TRP (sTRP) transmission method and a multiple-TRP (multi-TRP, mTRP) transmission method based on at least one of the upper layer signal and the at least one DCI.

10. In claim 9, A method, characterized in that the signal transmission method of the above uplink shared channel is set based on a method indicated by an SRS (sounding reference signal) resource set indicator of uplink DCI.

11. In claim 10, A method, characterized in that the signal transmission method of the uplink control channel and the signal transmission method of the uplink shared channel are set independently of each other.

12. In claim 11, A method, characterized in that the signal transmission method of the above uplink control channel is set based on a transmission configuration indicator (TCI) status indicator indicated by the upper layer signal.

13. In claim 11, The signal transmission method of the above uplink control channel is: A method characterized in that it is set based on TCI status related information of an RRC (radio resource control) signal.

14. In claim 10, A method, characterized in that the signal transmission method of the above uplink control channel is set to be the same as the signal transmission method of the above uplink shared channel.

15. In claim 14, If the value of the SRS resource set indicator of the above uplink DCI is a predetermined value, A method, characterized in that the signal transmission method of the above uplink control channel is set to be the same as the signal transmission method of the above uplink shared channel.

16. In claim 14, If the above uplink DCI does not include an SRS resource set indicator, A method, characterized in that the signal transmission method of the above uplink shared channel is set based on a method indicated by TCI status related information of downlink DCI transmitted before the uplink DCI.

17. In a terminal in a wireless communication system, At least one transmitter; At least one receiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform a specific operation; The above specific actions are: Receive an upper layer signal and at least one DCI (downlink control information) from a TRP (transmission reception point); Based on the upper layer signal and at least one DCI, a signal transmission method of an uplink shared channel is set to one of a single-TRP (sTRP) transmission method and a multi-TRP (multi-TRP, mTRP) transmission method; Based on at least one of the above upper layer signal and the at least one DCI, the signal transmission method of the uplink control channel is set to one of the single TRP transmission method and the multiple TRP transmission method; and A terminal characterized by transmitting an uplink shared channel signal and an uplink control channel signal to the TRP according to a set signal transmission method.

18. In a TRP (transmission reception point) operating in a wireless communication system, At least one transmitter; At least one receiver; at least one processor; and At least one memory operably connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform a specific operation; The above specific actions are: Receive an uplink shared channel signal from the terminal; and Receive an uplink control channel signal from the above terminal, A TRP characterized in that the signal transmission method of the above uplink shared channel and the signal transmission method of the above uplink control channel are set to one of a single-TRP (sTRP) transmission method and a multiple-TRP (multi-TRP, mTRP) transmission method based on at least one of the upper layer signal and the at least one DCI.

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