Method and apparatus for transmitting and receiving data channel in multi-TRP system

Abstract

A method and an apparatus for transmitting and receiving a data channel in a multi-TRP system are disclosed. The method performed by the UE comprises the steps of: receiving DCI of a base station via a first TRP or a second TRP; determining a scheduling offset between the DCI and a PDSCH occasion scheduled by the DCI based on PDSCH scheduling information included in the DCI; determining one or more TCI states for one or more PDSCH reception based on a result of comparing the scheduling offset with the duration; and receiving one or more PDSCHs of the base station via at least one of the first TRP or the second TRP based on the one or more TCI states.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to enhanced communication technology, and more particularly, to a technique for transmitting and receiving a data channel in a communication system supporting multiple transmission and reception points (TRPs). BACKGROUND

[0002] Communication networks (e.g., 5G communication networks or 6G communication networks) are being developed to provide enhanced communication services compared to existing communication networks (e.g., long term evolution (LTE), LTE-Advanced (LTE-A), etc.). A 5G communication network (e.g., a New Radio (NR) communication network) can support sub-6 GHz bands and above-6 GHz bands. In other words, a 5G communication network can support a frequency range 1 (FR1) band and / or a FR2 band. Compared to an LTE communication network, a 5G communication network can support various communication services and scenarios. For example, the usage scenarios of a 5G communication network can include enhanced Mobile BroadBand (eMBB), Ultra Reliable Low Latency Communication (URLLC), massive Machine Type Communication (mMTC), etc.

[0003] Compared to a 5G communication network, a 6G communication network can support a wide variety of communication services and scenarios. A 6G communication network can meet the requirements of super performance, super bandwidth, super space, super precision, super intelligence, and / or super reliability. A 6G communication network can support multiple wide frequency bands and can be applied to various usage scenarios, such as terrestrial communication, non-terrestrial communication, sidelink communication, etc.

[0004] On the other hand, multiple transmission and reception points (mTRP) can be introduced into a communication network (e.g., a 5G communication network and / or a 6G communication network). The mTRPs can be geographically separated. A base station can perform communication with a terminal using the mTRPs. The mTRP technology can be used to solve a quality of service (QoS) degradation problem of a cell edge terminal and / or an inter-cell interference problem. In an environment in which a non-line-of-sight (NLOS) path is limited, the mTRP technology can be used to provide an additional communication path.

[0005] mTRP-based communication can be performed based on a coherent joint transmission (CJT) scheme or a non-CJT (NCJT) scheme. In the CJT scheme, the mTRPs can perform coordinated communication based on a stable backhaul link, and the mTRPs can provide a terminal with a synchronized communication service. In the NCJT scheme, the mTRPs can provide a terminal with a communication service without coordination. For example, in the NCJT scheme, the mTRPs can perform operations such as a scheduling operation, a precoding matrix selection operation, and a modulation and coding scheme (MCS) determination operation without coordination.

[0006] A communication system can support a unified transmission configuration indicator (TCI). In a communication system supporting a unified TCI, a reception operation of a physical downlink shared channel (PDSCH) can be performed as follows. A terminal can receive downlink control information (DCI), and can identify indication information of a TCI state included by the DCI. The terminal can expect PDSCH reception by applying the TCI state indicated (e.g., configured) by the DCI after a certain duration (e.g., a beam application time (BAT)). On the other hand, the capabilities of terminals can be different, and the time required to apply a TCI state can differ according to the terminal capabilities. A method for PDSCH reception that takes into account the terminal capabilities (e.g., the time required to apply a TCI state) can be needed. SUMMARY

[0007] TECHNICAL PROBLEM The present disclosure is directed to providing a method and apparatus for transmitting and receiving a data channel in a communication system supporting a plurality of transmission and reception points (TRPs).

[0008] TECHNICAL SOLUTION A method of a user equipment (UE) according to an example embodiment of the present application for achieving the above object can include receiving, via a first transmission and reception point (first TRP) or a second TRP, downlink control information (DCI) of a base station; determining a scheduling offset between the DCI and a physical downlink shared channel (PDSCH) occasion scheduled by the DCI based on PDSCH scheduling information included in the DCI; determining one or more transmission configuration indicator (TCI) states for receiving one or more PDSCHs based on a comparison result between the scheduling offset and a duration; and receiving, via at least one of the first TRP or the second TRP, one or more PDSCHs of the base station based on the one or more TCI states.

[0009] In a case where the UE does not support two default beams, the one or more TCI states can be determined based on the comparison result between the scheduling offset and the duration, and in a case where the UE supports two default beams, the one or more TCI states can be determined regardless of the comparison result between the scheduling offset and the duration.

[0010] Based on an end time of the scheduling offset being earlier than an end time of the duration, the one or more TCI states for receiving the one or more PDSCHs can be determined as first indicated TCI states configured for the UE.

[0011] Based on an end time of the scheduling offset being later than an end time of the duration and a format of the DCI being DCI format 1_0, the one or more TCI states for receiving the one or more PDSCHs can be determined as one or more TCI states indicated by signaling of the base station.

[0012] Based on an end time of the scheduling offset being later than an end time of the duration, the format of the DCI being DCI format 1_0, and the signaling of the base station not indicating the one or more TCI states, the one or more TCI states for receiving the one or more PDSCHs can be determined as the first indicated TCI states configured for the UE.

[0013] Based on an end time of the scheduling offset being later than an end time of the duration, the format of the DCI being DCI format 1_1 or DCI format 1_2, and the DCI format 1_1 or the DCI format 1_2 not including a TCI selection field, the one or more TCI states for receiving the one or more PDSCHs can be determined as the first indicated TCI states and second indicated TCI states configured for the UE.

[0014] Based on the end time of the scheduling offset being later than the end time of the duration, the format of the DCI being DCI format 1_1 or DCI format 1_2, and the DCI format 1_1 or DCI format 1_2 including a TCI selection field, one or more TCI states for receiving the one or more PDSCHs can be determined based on a codepoint value of the TCI selection field.

[0015] The method can further include determining a duration indicating a time for applying the one or more TCI states, and transmitting information about the duration to the base station via at least one of the first TRP or the second TRP, wherein the duration includes a compensation time additionally required for beam configuration of the one or more PDSCHs having different numerologies.

[0016] The duration can be determined based on a sum of a time required to receive the DCI and a time required to prepare reception of the one or more PDSCHs based on the DCI, a start time of the duration can be equal to a start time or an end time of the DCI, and the start time of the duration can be preconfigured by at least one of the UE or the base station.

[0017] A start time of the scheduling offset can be equal to a start time or an end time of the DCI, an end time of the scheduling offset can be equal to a start time or an end time of the PDSCH occasion, and each of the start time and the end time of the scheduling offset can be preconfigured by at least one of the UE or the base station.

[0018] A user equipment (UE) according to an exemplary embodiment of the present application for achieving the above object can include at least one processor, wherein the at least one processor can cause the UE to perform: receiving, via a first transmission and reception point (first TRP) or a second TRP, downlink control information (DCI) of a base station; determining a scheduling offset between the DCI and a physical downlink shared channel (PDSCH) occasion scheduled by the DCI based on PDSCH scheduling information included in the DCI; determining one or more transmission configuration indicator (TCI) states for receiving the one or more PDSCHs based on a comparison result between the scheduling offset and a duration; and receiving, via at least one of the first TRP or the second TRP, one or more PDSCHs of the base station based on the one or more TCI states.

[0019] In a case where the UE does not support two default beams, the one or more TCI states can be determined based on the comparison result between the scheduling offset and the duration, and in a case where the UE supports two default beams, the one or more TCI states can be determined regardless of the comparison result between the scheduling offset and the duration.

[0020] Based on the ending time of the scheduling offset being earlier than the ending time of the duration, the one or more TCI states for receiving the one or more PDSCHs can be determined as the first indicated TCI states configured for the UE.

[0021] Based on the ending time of the scheduling offset being later than the ending time of the duration and the format of the DCI being DCI format 1_0, the one or more TCI states for receiving the one or more PDSCHs can be determined as the one or more TCI states indicated by the signaling of the base station.

[0022] Based on the ending time of the scheduling offset being later than the ending time of the duration, the format of the DCI being DCI format 1_0, and the signaling of the base station not indicating the one or more TCI states, the one or more TCI states for receiving the one or more PDSCHs can be determined as the first indicated TCI states and the second indicated TCI states configured for the UE.

[0023] Based on the ending time of the scheduling offset being later than the ending time of the duration, the format of the DCI being DCI format 1_1 or DCI format 1_2, and the DCI format 1_1 or DCI format 1_2 not including the TCI selection field, the one or more TCI states for receiving the one or more PDSCHs can be determined as the first indicated TCI states and the second indicated TCI states configured for the UE.

[0024] Based on the ending time of the scheduling offset being later than the ending time of the duration, the format of the DCI being DCI format 1_1 or DCI format 1_2, and the DCI format 1_1 or DCI format 1_2 including the TCI selection field, the one or more TCI states for receiving the one or more PDSCHs can be determined based on a codepoint value of the TCI selection field.

[0025] The at least one processor can further cause the UE to perform: determining a duration indicating a time for applying the one or more TCI states; and transmitting, to the base station, information about the duration via at least one of the first TRP or the second TRP, wherein the duration includes a compensation time additionally required for beam configuration of the one or more PDSCHs having different numerologies.

[0026] The duration can be determined based on a sum of a time required to receive the DCI and a time required to prepare reception of the one or more PDSCHs based on the DCI, a start time of the duration can be equal to a start time or an end time of the DCI, and the start time of the duration can be preconfigured by at least one of the UE or the base station.

[0027] The start time of the scheduling offset can be equal to the start time or the end time of the DCI, the end time of the scheduling offset can be equal to the start time or the end time of the PDSCH occasion, and each of the start time and the end time of the scheduling offset can be preconfigured by at least one of the UE or the base station.

[0028] Advantageous Effects According to the present application, in the PDSCH reception procedure of the single-DCI based mTRP communication, the beam used for PDSCH reception before the time of updating the TCI state (e.g., the time defined by the beam application time (BAT)) can be dynamically indicated or configured. According to the gap between the PDCCH and the PDSCH scheduled by the PDCCH and the minimum required time for beam application, the TCI state of the terminal used for PDSCH reception can be different. The start position and / or the end position of the gap between the PDCCH and the scheduled PDSCH can be explicitly defined, and the start position of the minimum required time can be explicitly defined. Based on these definitions, the ambiguity of the beam configuration for PDSCH in the terminal and the base station can be resolved. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a conceptual diagram illustrating an exemplary embodiment of a communication system.

[0030] Figure 2 is a block diagram illustrating an exemplary embodiment of a communication node constituting a communication system.

[0031] Figure 3 is a block diagram illustrating an exemplary embodiment of a communication node performing communication.

[0032] Figure 4a is a block diagram illustrating an exemplary embodiment of a transmission path.

[0033] Figure 4b is a block diagram illustrating an exemplary embodiment of a reception path.

[0034] Figure 5 is a conceptual diagram illustrating an exemplary embodiment of a system frame in a communication system.

[0035] Figure 6 is a conceptual diagram illustrating an exemplary embodiment of a subframe in a communication system.

[0036] Figure 7 is a conceptual diagram illustrating an exemplary embodiment of a slot in a communication system.

[0037] Figure 8 is a conceptual diagram illustrating an exemplary embodiment of a time-frequency resource in a communication system.

[0038] Figure 9 is a conceptual diagram illustrating a method of receiving a PDSCH based on a capability of supporting a default beam in single-DCI based mTRP communication.

[0039] Figure 10 is a conceptual diagram illustrating a method of receiving a PDSCH based on different reference points.

[0040] Figure 11 is a sequence diagram illustrating a method of transmitting and receiving a data channel in single-DCI based mTRP communication. DETAILED DESCRIPTION

[0041] Since the present application can be modified in various ways and can have various forms, specific exemplary embodiments will be shown in the drawings and described in detail in the detailed description. However, it should be understood that the present application is not intended to be limited to the specific exemplary embodiments, but rather, the present application covers all modifications and alternatives falling within the spirit and scope of the present application.

[0042] Relationship terms such as first, second, and the like can be used to describe various elements, but the elements should not be limited by the terms. The terms are used only to distinguish one element from another. For example, without departing from the scope of the present application, a first component can be named a second component, and a second component can also be similarly named a first component. The term "and / or" means any one or a combination of a plurality of related and described items.

[0043] In the present application, "at least one of A and B" can mean "at least one of A or B" or "at least one of a combination of one or more of A and B". In addition, "one or more of A and B" can mean "one or more of A or B" or "one or more of a combination of one or more of A and B".

[0044] In the present application, "(re)transmission" can mean "transmission", "retransmission", or "transmission and retransmission", "(re)configuration" can mean "configuration", "reconfiguration", or "configuration and reconfiguration", "(re)connection" can mean "connection", "reconnection", or "connection and reconnection", and "(re)access" can mean "access", "re-access", or "access and re-access".

[0045] When it is mentioned that a certain component is "coupled" or "connected" with another component, it should be understood that the certain component is "coupled" or "connected" directly with the other component, or that another component can be disposed therebetween. In contrast, when it is mentioned that a certain component is "directly coupled" or "directly connected" with another component, it should be understood that no other component is disposed therebetween.

[0046] The terms used in the present application are used only to describe specific exemplary embodiments and are not intended to limit the present application. The singular expression includes the plural expression, unless the context clearly dictates otherwise. In the present application, terms such as "include" or "have" are intended to indicate that there is existence of the features, numbers, steps, operations, components, parts or combinations thereof described in the specification, but it should be understood that these terms do not exclude the existence or addition of one or more features, numbers, steps, operations, components, parts or combinations thereof.

[0047] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. Terms generally used in dictionaries and have been used in the dictionaries should be interpreted to have meanings matching the contextual meanings in the art. In the present specification, unless clearly defined, the terms are not necessarily interpreted as having formal meanings.

[0048] Hereinafter, exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings. In describing the present application, for the sake of overall understanding of the present application, the same reference numerals refer to the same elements throughout the description of the drawings, and repetitive description thereof will be omitted. Operations according to the exemplary embodiments explicitly described in the present application, combinations of the exemplary embodiments, extensions of the exemplary embodiments, and / or variant forms of the exemplary embodiments can be performed. Some operations can be omitted, and the sequence of operations can be changed.

[0049] Even when a method (e.g., transmission or reception of a signal) performed at a first communication node among the communication nodes is described in the exemplary embodiments, a corresponding second communication node can perform a method (e.g., reception or transmission of a signal) corresponding to the method performed at the first communication node. In other words, when the operation of a user equipment (UE) is described, a base station corresponding thereto can perform an operation corresponding to the operation of the UE. Conversely, when the operation of a base station is described, a corresponding UE can perform an operation corresponding to the operation of the base station.

[0050] A base station can be referred to with a variety of different terminology including, for example, a node B, an evolved node B, a next generation node B (gNodeB), gNB, device, apparatus, node, communication node, base transceiver station (BTS), radio remote head (RRH), transmission reception point (TRP), radio unit (RU), roadside unit (RSU), radio transceiver, access point, access node, etc. A user equipment (UE) can be referred to with a variety of different terminology including, for example, terminal, device, apparatus, node, communication node, end node, access terminal, mobile terminal, station, subscriber station, mobile station, portable subscriber station, on-board unit (OBU), etc.

[0051] In the present disclosure, signaling can be one of higher layer signaling, MAC signaling, and physical (PHY) signaling, or a combination of two or more. A message for higher layer signaling can be referred to as a "higher layer message" or a "higher layer signaling message". A message for MAC signaling can be referred to as a "MAC message" or a "MAC signaling message". A message for PHY signaling can be referred to as a "PHY message" or a "PHY signaling message". Higher layer signaling can refer to an operation of transmitting and receiving system information (e.g., master information block (MIB), system information block (SIB)) and / or an RRC message. MAC signaling can refer to an operation of transmitting and receiving a MAC control element (CE). PHY signaling can refer to an operation of transmitting and receiving control information (e.g., downlink control information (DCI), uplink control information (UCI), or sidelink control information (SCI)).

[0052] In the present disclosure, "configuration of an operation (e.g., transmission operation)" can refer to configuration information (e.g., information element, parameter) required for the operation and / or signaling of information indicating execution of the operation. "Configuration of an information element (e.g., parameter)" can refer to signaling of the information element. In the present disclosure, "signal and / or channel" can refer to either a signal, a channel, or both a signal and a channel, and "signal" can be used to mean "signal and / or channel".

[0053] The communication network to which the exemplary embodiments are applied is not limited to the communication network described below, and the exemplary embodiments can be applied to various communication networks (e.g., a 4G communication network, a 5G communication network, and / or a 6G communication network). Herein, the "communication network" can be used interchangeably with the term "communication system."

[0054] Figure 1 is a conceptual diagram showing an exemplary embodiment of a communication system.

[0055] As shown in Figure 1 , the communication system 100 can 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, and 130-6. In addition, the communication system 100 can 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)). When the communication system 100 is a 5G communication (e.g., an NR system), the core network can include an access and mobility management function (AMF), a user plane function (UPF), a session management function (SMF), etc.

[0056] The plurality of communication nodes 110 to 130 can support a communication protocol specified in a 3rd generation partnership project (3GPP) standard (e.g., an LTE communication protocol, an LTE-A communication protocol, an NR communication protocol, etc.). The plurality of communication nodes 110 to 130 can support a code division multiple access (CDMA) technique, a wideband CDMA (WCDMA) technique, a time division multiple access (TDMA) technique, a frequency division multiple access (FDMA) technique, an orthogonal frequency division multiplexing (OFDM) technique, a filtered OFDM technique, a cyclic prefix OFDM (CP-OFDM) technique, a discrete Fourier transform spread OFDM (DFT-s-OFDM) technique, an orthogonal frequency division multiple access (OFDMA) technique, a single carrier FDMA (SC-FDMA) technique, a non-orthogonal multiple access (NOMA) technique, a generalized frequency division multiplexing (GFDM) technique, a filter bank multi-carrier (FBMC) technique, a universal filtered multi-carrier (UFMC) technique, a space division multiple access (SDMA) technique, or the like. Each of the plurality of communication nodes can have the following structure.

[0057] Figure 2 is a block diagram illustrating an exemplary embodiment of a communication node constituting a communication system.

[0058] As Figure 2As shown, the communication node 200 can include at least one processor 210, a memory 220, and a transceiver 230 connected to a network for performing communication. Further, the communication node 200 can further include an input interface device 240, an output interface device 250, and a storage device 260, etc. Each component included in the communication node 200 can communicate with each other when connected through a bus 270.

[0059] The processor 210 can execute a program stored in at least one of the memory 220 and the storage device 260. The processor 210 can refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which a method according to an embodiment of the present application is executed. Each of the memory 220 and the storage device 260 can be constituted by at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 220 can include at least one of a read-only memory (ROM) and a random access memory (RAM).

[0060] Referring again to Figure 1 , the communication system 100 can include a plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2, and a plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6. The communication system 100 including the base stations 110-1, 110-2, 110-3, 120-1, and 120-2, and the terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 can be referred to as an "access network". Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 can form a macro cell, and each of the fourth base station 120-1 and the fifth base station 120-2 can form a small cell. The fourth base station 120-1, the third terminal 130-3, and the fourth terminal 130-4 can belong to a cell coverage of the first base station 110-1. Further, the second terminal 130-2, the fourth terminal 130-4, and the fifth terminal 130-5 can belong to a cell coverage of the second base station 110-2. Further, the fifth base station 120-2, the fourth terminal 130-4, the fifth terminal 130-5, and the sixth terminal 130-6 can belong to a cell coverage of the third base station 110-3. Further, the first terminal 130-1 can belong to a cell coverage of the fourth base station 120-1, and the sixth terminal 130-6 can belong to a cell coverage of the fifth base station 120-2.

[0061] Here, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 can refer to a NodeB, 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), or the like.

[0062] Each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 can refer to a user equipment (UE), a terminal equipment (TE), an advanced mobile station (AMS), a high reliability-mobile station (HR-MS), a terminal, an access terminal, a mobile terminal, a station, a subscriber station, a mobile station, a portable subscriber station, a node, a device, an on-board unit (OBU), or the like.

[0063] On the other hand, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 can operate in the same frequency band or different frequency bands. The plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 can be connected to each other via an ideal backhaul or a non-ideal backhaul, and exchange information with each other via the ideal or non-ideal backhaul. Furthermore, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 can be connected to a core network through an ideal or non-ideal backhaul. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 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, or 130-6, and transmit a signal received from the corresponding terminal 130-1, 130-2, 130-3, 130-4, 130-5, or 130-6 to the core network.

[0064] Further, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 can support multiple-input multiple-output (MIMO) transmission (e.g., single-user MIMO (SU-MIMO), multi-user MIMO (MU-MIMO), massive MIMO, etc.), coordinated multipoint (CoMP) transmission, carrier aggregation (CA) transmission, transmission in unlicensed bands, sidelink communication (e.g., device-to-device (D2D) communication, proximity service (ProSe)), Internet of Things (IoT) communication, dual connectivity (DC), and the like. Here, each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 can perform operations corresponding to the operations of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2, and operations supported by the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2. For example, the second base station 110-2 can transmit a signal to the fourth terminal 130-4 in a SU-MIMO manner, and the fourth terminal 130-4 can receive a signal from the second base station 110-2 in a SU-MIMO manner. Alternatively, the second base station 110-2 can transmit a signal to the fourth terminal 130-4 and the fifth terminal 130-5 in a MU-MIMO manner, and the fourth terminal 130-4 and the fifth terminal 130-5 can receive a signal from the second base station 110-2 in a MU-MIMO manner.

[0065] 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 in a CoMP transmission manner, 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 in a CoMP manner. Further, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 can exchange a signal with a corresponding terminal 130-1, 130-2, 130-3, 130-4, 130-5, or 130-6 belonging to a cell coverage thereof in a CA manner. Each of the base stations 110-1, 110-2, and 110-3 can control sidelink communication between the fourth terminal 130-4 and the fifth terminal 130-5, and thus 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.

[0066] On the other hand, a communication node performing communication in a communication network can be configured as follows. Figure 3 The illustrated communication node can be Figure 2 A specific exemplary embodiment of the illustrated communication node.

[0067] Figure 3 is a block diagram illustrating an exemplary embodiment of a communication node performing communication.

[0068] As Figure 3 As illustrated, each of the first communication node 300a and the second communication node 300b can be a base station or a UE. The first communication node 300a can transmit a signal to the second communication node 300b. A transmit processor 311 included in the first communication node 300a can receive data (e.g., data units) from a data source 310. The transmit processor 311 can receive control information from a controller 316. The control information can include at least one of system information, RRC configuration information (e.g., information configured by RRC signaling), MAC control information (e.g., MAC CEs), or PHY control information (e.g., DCI, SCI).

[0069] The transmit processor 311 can generate data symbols by performing processing operations (e.g., encoding operations, symbol mapping operations, etc.) on the data. The transmit processor 311 can generate control symbols by performing processing operations (e.g., encoding operations, symbol mapping operations, etc.) on the control information. In addition, the transmit processor 311 can generate synchronization / reference symbols for synchronization signals and / or reference signals.

[0070] A Tx MIMO processor 312 can perform spatial processing operations (e.g., precoding operations) on the data symbols, the control symbols, and / or the synchronization / reference symbols. The output of the Tx MIMO processor 312 (e.g., symbol streams) can be provided to modulators (MODs) included in transceivers 313a through 313t. The modulators can generate modulated symbols by performing processing operations on the symbol streams, and can generate signals by performing additional processing operations (e.g., analog conversion operations, amplification operations, filtering operations, up-conversion operations, etc.) on the modulated symbols. The signals generated by the modulators of the transceivers 313a through 313t can be transmitted via the antennas 314a through 314t.

[0071] The signals transmitted by the first communication node 300a can be received at the antennas 364a through 364r of the second communication node 300b. The signals received at the antennas 364a through 364r can be provided to the demodulators (DEMODs) included in transceivers 363a through 363r. The demodulators (DEMODs) can obtain samples by performing processing operations (e.g., filtering, amplification, down-conversion, digitization, etc.) on the signals. The demodulators can perform additional processing operations on the samples to obtain symbols. A MIMO detector 362 can perform MIMO detection on the symbols. A receive processor 361 can perform processing operations (e.g., de-interleaving, decoding, etc.) on the symbols. The output of the receive processor 361 can be provided to a data sink 360 and a controller 366. For example, data can be provided to the data sink 360 and control information can be provided to the controller 366.

[0072] On the other hand, the second communication node 300b can transmit signals to the first communication node 300a. A transmit processor 368 included in the second communication node 300b can receive data (e.g., data units) from a data source 367 and perform processing operations on the data to generate data symbols. The transmit processor 368 can receive control information from the controller 366 and perform processing operations on the control information to generate control symbols. In addition, the transmit processor 368 can generate reference symbols by performing processing operations on reference signals.

[0073] A Tx MIMO processor 369 can perform spatial processing (e.g., precoding) on the data symbols, the control symbols, and / or the reference symbols. The output of the Tx MIMO processor 369 (e.g., symbol streams) can be provided to the modulators (MODs) included in transceivers 363a through 363t. The modulators can generate modulated symbols by performing processing operations on the symbol streams and can generate signals by performing additional processing operations (e.g., analog conversion, amplification, filtering, frequency up-conversion) on the modulated symbols. The signals generated by the modulators of the transceivers 363a through 363t can be transmitted via the antennas 364a through 364t.

[0074] The signal transmitted by the second communication node 300b can be received at antennas 314a to 314r of the first communication node 300a. The signals received at antennas 314a to 314r can be provided to a demodulator (DEMOD) included in transceivers 313a to 313r. The demodulator can obtain samples by performing signal processing operations (e.g., filtering, amplification, down-conversion, digital conversion). The demodulator can perform additional processing operations on the samples to obtain symbols. The MIMO detector 320 can perform MIMO detection operations on the symbols. The receiver processor 319 can perform symbol processing operations (e.g., deinterleaving, decoding, etc.). The output of the receiver processor 319 can be provided to a data sink 318 and a controller 316. For example, data can be provided to the data sink 318, and control information can be provided to the controller 316.

[0075] Memory 315 and memory 365 can store data, control information, and / or program code. Scheduler 317 can perform scheduling operations for communication. Figure 3 The processors 311, 312, 319, 361, 368, and 369 shown, as well as the controllers 316 and 366, can be... Figure 2 The processor 210 shown can be used to perform the methods described in this invention.

[0076] Figure 4a This is a block diagram illustrating an exemplary implementation of the transmission path. Figure 4b This is a block diagram illustrating an exemplary implementation of the receiving path.

[0077] like Figure 4a and Figure 4b As shown, a transmission path 410 can be implemented in the communication node transmitting the signal, and a reception path 420 can be implemented in the communication node receiving the signal. Transmission path 410 may include: a channel coding and modulation block 411, a serial-to-parallel (S-to-P) block 512, an N-point inverse fast Fourier transform (NIFFT) block 413, a parallel-to-serial (P-to-S) block 414, a cyclic prefix (CP) addition block 415, and an up-converter (UC) 416. Reception path 420 may include a down-converter (DC) 421, a CP removal block 422, an S-to-P block 423, an N-point FFT block 424, a P-to-S block 425, and a channel decoding and demodulation block 426. Here, N can be a natural number.

[0078] In the transmit path 410, information bits can be input to a channel coding and modulation block 411. The channel coding and modulation block 411 can perform encoding operations (e.g., low-density parity check (LDPC) encoding operations, polar encoding operations, etc.) and modulation operations (e.g., Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (QAM), etc.) on the information bits. The output of the channel coding and modulation block 411 can be a sequence of modulation symbols.

[0079] An S-to-P block 412 can convert the frequency-domain modulation symbols into parallel symbol streams, to generate N parallel symbol streams. N can be an IFFT size or a FFT size. An N-point IFFT block 413 can generate time-domain signals by performing an IFFT operation on the N parallel symbol streams. A P-to-S block 414 can convert the output (e.g., parallel signals) of the N-point IFFT block 413 into a serial signal, to generate a serial signal.

[0080] A CP addition block 415 can insert a CP into the signal. An up-converter 416 can up-convert the output of the CP addition block 415 in frequency to a radio frequency (RF) frequency. In addition, the output of the CP addition block 415 can be filtered in baseband prior to up-conversion.

[0081] The signal transmitted from the transmit path 410 can be input to the receive path 420. The operations in the receive path 420 can be the reverse of the operations in the transmit path 410. A down-converter 421 can down-convert the frequency of the received signal to a baseband frequency. A CP removal block 422 can remove the CP from the signal. The output of the CP removal block 422 can be a serial signal. An S-to-P block 423 can convert the serial signal to parallel signals. An N-point FFT block 424 can generate N parallel signals by performing an FFT algorithm. A P-to-S block 425 can convert the parallel signals to a sequence of modulation symbols. A channel decoding and demodulation block 426 can perform demodulation operations on the modulation symbols and can recover the data by performing decoding operations on the results of the demodulation operations.

[0082] In Figure 4a and Figure 4b , a discrete Fourier transform (DFT) and an inverse DFT (IDFT) can be used instead of the FFT and the IFFT. Figure 4a and Figure 4bEach of the blocks (e.g., components) in FIGS. 1-3 can be implemented by at least one of hardware, software, or firmware. For example, Figure 4a and Figure 4b Some of the blocks in FIGS. 1-3 can be implemented by software, and other blocks can be implemented by hardware or a combination of hardware and software. In Figure 4a and Figure 4b In FIGS. 1-3, one block can be split into several blocks, several blocks can be integrated into one block, some blocks can be omitted, and blocks supporting other functions can be added.

[0083] Figure 5 is a conceptual diagram illustrating an example embodiment of a system frame in a communication system.

[0084] As shown in Figure 5 , time resources in a communication system can be divided on a frame basis. For example, system frames of a communication system can be continuously configured in a time domain. The length of a system frame can be 10 milliseconds (ms). A system frame number (SFN) can be set to one of #0 to #1023. In this case, 1024 system frames can be repeated on a time domain of a communication system. For example, the SFN of a system frame after system frame #1023 can be #0.

[0085] One system frame can include two half-frames. The length of a half-frame can be 5 ms. A half-frame located at a beginning region of a system frame can be referred to as "half-frame #0", and a half-frame located at an end region of a system frame can be referred to as "half-frame #1". One system frame can include 10 sub-frames. The length of one sub-frame can be 1 ms. The 10 sub-frames within one system frame can be referred to as sub-frame #0 to sub-frame #9.

[0086] Figure 6 is a conceptual diagram illustrating an example embodiment of a sub-frame in a communication system.

[0087] As shown in Figure 6 , one sub-frame can include n slots, where n can be a natural number. Accordingly, one sub-frame can consist of one or more slots.

[0088] Figure 7 is a conceptual diagram illustrating an example embodiment of a slot in a communication system.

[0089] As shown in Figure 7 , one slot can include one or more symbols. For example, Figure 7 One slot as shown in FIG. 3 can include 14 symbols. The length of a slot can vary according to the number of symbols included in the slot and the length of the symbols. Alternatively, the length of a slot can vary according to numerology.

[0090] The parameter set of physical signals and channels applied in a communication system can be variable. The parameter set can be adjusted to meet various technical requirements of the communication system. In a communication system applying OFDM waveform technology based on cyclic prefix (CP), the parameter set may include subcarrier spacing and CP length (or CP type). Table 1 illustrates a first exemplary embodiment of a method for configuring the parameter set of a CP-OFDM-based communication system. Depending on the frequency band in which the communication system operates, at least some of the parameter sets in Table 1 can be supported. Additionally, the communication system can support parameter sets not listed in Table 1.

[0091] [Table 1] When the subcarrier spacing is 15 kHz (e.g., μ=0), the time slot length can be 1 ms. In this case, a system frame can include 10 time slots. When the subcarrier spacing is 30 kHz (e.g., μ=1), the time slot length can be 0.5 ms. In this case, a system frame can include 20 time slots.

[0092] When the subcarrier spacing is 60 kHz (e.g., μ=2), the slot length can be 0.25 ms. In this case, a system frame can include 40 slots. When the subcarrier spacing is 120 kHz (e.g., μ=3), the slot length can be 0.125 ms. In this case, a system frame can include 80 slots. When the subcarrier spacing is 240 kHz (e.g., μ=4), the slot length can be 0.0625 ms. In this case, a system frame can include 160 slots.

[0093] Symbols can be configured as downlink (DL) symbols, flexible (FL) symbols, or uplink (UL) symbols. A time slot consisting only of DL symbols can be called a "DL time slot", a time slot consisting only of FL symbols can be called a "FL time slot", and a time slot consisting only of UL symbols can be called a "UL time slot".

[0094] The slot format can be semi-statically configured through higher layer signaling (e.g., RRC signaling). Information indicating the semi-static slot format can be included in system information, and the semi-static slot format can be configured to be cell-specific. In addition, the semi-static slot format can be further configured for each terminal through terminal-specific higher layer signaling (e.g., RRC signaling). The flexible symbol in the cell-specific slot format can be overridden to be a downlink symbol or an uplink symbol through terminal-specific higher layer signaling. Furthermore, the slot format can be dynamically indicated through physical layer signaling (e.g., slot format indicator (SFI) included in DCI). The semi-statically configured slot format can be overridden by the dynamically indicated slot format. For example, the semi-statically configured flexible symbol can be overridden to be a downlink symbol or an uplink symbol by the SFI.

[0095] The reference signal can include a channel state information-reference signal (CSI-RS), a sounding reference signal (SRS), a demodulation-reference signal (DM-RS), and a phase tracking-reference signal (PT-RS). The channel can include 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), and a physical sidelink shared channel (PSSCH). In the disclosure, the control channel can refer to the PDCCH, the PUCCH, or the PSCCH, and the data channel can refer to the PDSCH, the PUSCH, or the PSSCH.

[0096] Figure 8 FIG. 1 is a conceptual diagram illustrating an exemplary embodiment of a time-frequency resource in a communication system.

[0097] As Figure 8 indicated in FIG. 2, a resource consisting of one OFDM symbol on the time axis and one subcarrier on the frequency axis can be defined as a "resource element (RE)". A resource consisting of one OFDM symbol on the time axis and K subcarriers on the frequency axis can be defined as a "resource element group (REG)". The REG can include K REs. The REG can be used as a basic unit of resource allocation in the frequency domain. K can be a natural number. For example, K can be 12. N can be a natural number. In Figure 7 indicated in FIG. 2, N can be 14. The N OFDM symbols can be used as a basic unit of resource allocation in the time domain.

[0098] In the disclosure, the RB can refer to a common RB (CRB). Alternatively, the RB can refer to a physical RB (PRB) or a virtual RB (VRB). In a communication system, the CRB can refer to an RB that forms a set of consecutive RBs (e.g., a common RB grid) based on a reference frequency (e.g., point A). A carrier and / or a bandwidth part can be mapped on the common RB grid. That is, the carrier and / or the bandwidth part can be configured with the CRB. The RB or the CRB constituting the bandwidth part can be referred to as a PRB, and the CRB index can be converted into a PRB index within the bandwidth part as appropriate.

[0099] The downlink data can be transmitted through a PDSCH. The base station can transmit configuration information (e.g., scheduling information) of the PDSCH to the terminal through a PDCCH. The terminal can obtain the configuration information of the PDSCH by receiving the PDCCH (e.g., Downlink Control Information (DCI)). For example, the configuration information of the PDSCH can include a modulation coding scheme (MCS) for transmission / reception of the PDSCH, time resource information of the PDSCH, frequency resource information of the PDSCH, and feedback resource information of the PDSCH. The PDSCH can refer to a radio resource for transmitting and receiving the downlink data. Alternatively, the PDSCH can refer to the downlink data itself. The PDCCH can refer to a radio resource for transmitting and receiving the downlink control information (e.g., DCI). Alternatively, the PDCCH can refer to the downlink control information itself.

[0100] A terminal can perform a monitoring operation on a PDCCH to receive a PDSCH transmitted from a base station. The base station can inform a terminal of configuration information for a PDCCH monitoring operation with a higher layer message (e.g., a radio resource control (RRC) message). The configuration information for the PDCCH monitoring operation can include control resource set (CORESET) information and search space information.

[0101] The CORESET information can include PDCCH demodulation reference signal (DMRS) information, PDCCH precoding information, and PDCCH occasion information, etc. The PDCCH DMRS can be a DMRS used for demodulating a PDCCH. The PDCCH occasion refers to a region in which a PDCCH can potentially exist, which means it is a region in which DCI can be transmitted. The PDCCH occasion can also be referred to as a PDCCH candidate. The PDCCH occasion information can include time resource information and frequency resource information for the PDCCH occasion. In the time domain, the length of the PDCCH occasion can be indicated in units of symbols. In the frequency domain, the size of the PDCCH occasion can be indicated in units of RBs (e.g., in units of PRBs or CRBs).

[0102] The search space information can include a CORESET identifier (ID) associated with a search space, a periodicity of PDCCH monitoring, and / or an offset of PDCCH monitoring. The periodicity and offset of PDCCH monitoring can each be indicated in units of slots. In addition, the search space information can further include an index of a symbol in which a PDCCH monitoring operation starts.

[0103] 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 refer to a transmission operation of system information and / or a transmission operation of an RRC message. The number of BWPs configured for a single terminal can be one or more. The terminal can receive the BWP configuration information from the base station and identify the configured BWP based on the received configuration information. When a plurality of BWPs are configured for downlink communication, the base station can activate one or more BWPs among the plurality of BWPs. The base station can transmit configuration information of the activated BWP 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. The terminal can identify the activated BWP by receiving the configuration information from the base station and perform a downlink reception operation on the activated BWP.

[0104] On the other hand, a communication system (e.g., an NR communication system, a 5G communication system, or a 6G communication system) can support use cases such as enhanced Mobile BroadBand (eMBB), UltraReliable Low Latency Communication (URLLC), and massive Machine Type Communication (mMTC). A communication system (e.g., a communication network) can support transmission and reception point (TRP) technology (e.g., multi-TRP (mTRP) technology and / or single TRP (sTRP) technology). A communication system supporting TRP technology can be referred to as a TRP system (e.g., an mTRP system and / or an sTRP system). In the present disclosure, “TRP” can have the meaning including “sTRP” and / or “mTRP,” and “TRP” can refer to “sTRP” or “mTRP” according to the context. A TRP can refer to a set of antennas, a group of antennas, and / or an antenna array. A TRP can be associated with a CORESET and / or a beam (e.g., a beam group).

[0105] The mTRP technology can be classified into the category of MIMO technology. The mTRP can have the characteristics (e.g., cell level characteristics) of a macro cell, a small cell, a pico cell, and / or a femto cell. The mTRP can perform data transmission for a terminal. In the case where there is a channel (e.g., a link) having non-uniform channel conditions due to an obstacle and / or interference, the mTRP can mitigate the impact caused by the obstacle and / or interference. The mTRP can improve the data transmission rate of a terminal located in a cell edge.

[0106] The mTRP-based communication can be performed based on a coherent joint transmission (CJT) scheme or a non-CJT (NCJT) scheme. In the CJT scheme, the base station can know channel information between each TRP and the terminal, and can perform a pre-processing operation on data based on the channel information. In this case, the overhead caused by the transmission procedure of the channel information can increase, and a synchronization constraint between the TRPs can occur. In the NCJT scheme, the base station can not need to know the channel information between each TRP and the terminal. The mTRP can transmit data to the terminal without performing a pre-processing operation such as phase compensation. The complexity of the NCJT scheme can be lower than that of the CJT scheme.

[0107] The mTRP communication based on NCJT can be performed based on a single DCI scheme or a multiple DCI scheme. In the single DCI scheme, the PDSCHs transmitted by the mTRP can be scheduled by a single DCI. The single DCI can be transmitted by one TRP of the mTRP. In the multiple DCI scheme, the PDSCHs transmitted by each TRP can be scheduled by the DCI transmitted by the corresponding TRP. For example, the first PDSCH transmitted by the first TRP can be scheduled by the first DCI transmitted by the first TRP, and the second PDSCH transmitted by the second TRP can be scheduled by the second DCI transmitted by the second TRP. In other words, multiple PDSCHs can be scheduled with multiple DCIs.

[0108] In the single DCI scheme, the terminal can expect to receive the PDSCHs transmitted by different TRPs through different layers at the same time and with the same time and frequency resources. Alternatively, the terminal can expect to receive the PDSCHs transmitted by different TRPs through different time resources (e.g., different time regions) at the same time and with the same frequency resources and the same layers. Alternatively, the terminal can expect to receive the PDSCHs transmitted by different TRPs through different frequency resources (e.g., different frequency regions) at the same time and with the same time resources and the same layers.

[0109] In a multi-DCI scheme, PDSCH scheduling for each TRP can be performed by separate DCIs. The PDSCH scheduled by multiple DCIs can be fully overlapped or partially overlapped. Alternatively, the PDSCH scheduled by multiple DCIs can be non-overlapped. In both the single-DCI scheme and the multi-DCI scheme, the DCI can include transmission configuration indicator (TCI) state information for the PDSCH.

[0110] The indication / configuration of the TCI state for a terminal can be interpreted as an indication / configuration of a beam (e.g., a transmission beam and / or a reception beam). In other words, the TCI state can have a meaning corresponding to a beam. From a downlink (DL) communication perspective, the configuration of the TCI state can refer to a quasi co-location (QCL) configuration. From an uplink (UL) communication perspective, the configuration of the TCI state can refer to a spatial filter configuration. A unified TCI state can indicate (e.g., configure) a common beam regardless of the DL communication and the UL communication. Alternatively, a unified TCI state can indicate (e.g., configure) a common beam for each of the DL communication and the UL communication. The unified TCI can be referred to as a “UTCI”.

[0111] To enhance the reliability and / or robustness of mTRP communication, improvements such as PDCCH enhancement can be applied. Deployment scenarios for PDCCH enhancement can be classified into a single frequency network (SFN) and a non-SFN.

[0112] In the SFN scheme, different TRPs or different panels can utilize the same resource (e.g., the same time resource, the same frequency resource, and / or the same spatial resource) to transmit the same PDCCH. In other words, all TRPs or all panels can utilize the same DMRS configuration, the same DMRS location, and / or the same DMRS sequence to transmit the PDCCH. In this case, the TCI state can be implicitly configured differently from a reception perspective for the TRPs or the panels. The above-described exemplary embodiments can be performed based on multiple TCI states for a CORESET. There can be a synchronization constraint between the TRPs for ideal backhaul or near-ideal backhaul.

[0113] In the NSFN scheme, PDCCHs generated by respective TRPs can be multiplexed in time domain and / or frequency domain, and the multiplexed PDCCHs can be transmitted to the terminal. The scheme can be an mTRP-based PDCCH repetition scheme. In the NSFN scheme, the number of coded bits equal to the number of bits delivered through one PDCCH generated in each TRP can be divided among the TRPs, and TRP-specific bits (e.g., coded bits) can be transmitted through different PDCCH candidates for each TRP. The scheme can correspond to an sTRP-based PDCCH transmission scheme.

[0114] In the mTRP-based PDCCH repetition scheme, PDCCHs can be duplicated according to the number of TRPs, and the PDCCHs can be transmitted in the same search space (e.g., search spaces having the same index) within different search space sets, each search space set having the same number of PDCCH candidates. In this case, the search space sets can exist within the same CORESET or within different CORESETs. Since one TCI state can be associated with each CORESET, when the PDCCHs are transmitted from different search spaces within the same CORESET, only one TCI state of the PDCCHs transmitted from the different search spaces can be indicated (e.g., configured). In this case, the terminal can receive one PDCCH from one TRP at a specific time.

[0115] When the PDCCHs are transmitted from the same search spaces within different CORESETs, the terminal can implicitly expect to receive the PDCCHs from sTRPs or mTRPs according to the number of TCI states (e.g., TCI states indicated or configured by the base station). In this case, a single PDCCH can be divided into as many PDCCHs as the number of TRPs, and the divided PDCCHs can be transmitted in different PDCCH candidates. In this case, the aggregation level and the combined aggregation level can be the same. In the above exemplary embodiment, the PDCCH candidates can be allocated to different CORESETs. The payload size of the combination of the PDCCHs for the final distribution can be the same as the payload size of the PDCCHs transmitted from the sTRPs. Accordingly, from the perspective of decoding complexity, the sTRP-based PDCCH transmission scheme can be more advantageous than the mTRP-based PDCCH repetition scheme.

[0116] A terminal can perform mTRP communication or sTRP communication with a base station. The mTRP communication between the terminal and the base station can be performed via mTRPs associated with the base station. The sTRP communication between the terminal and the base station can be performed via sTRPs associated with the base station. The mTRP communication can be referred to as first TRP communication, and the sTRP communication can be referred to as second TRP communication. Alternatively, the mTRP communication can be referred to as second TRP communication, and the sTRP communication can be referred to as first TRP communication. The expression "the terminal performs first TRP communication with the base station" can mean that the terminal performs mTRP communication or sTRP communication with the base station via one or more TRPs associated with the base station. The expression "the terminal performs second TRP communication with the base station" can mean that "the terminal performs sTRP communication or mTRP communication with the base station via one or more TRPs associated with the base station."

[0117] In a communication system, a unified TCI framework can be supported. A base station can transmit information of a TCI state pool (e.g., a pool list) to a terminal with RRC signaling. A terminal can receive information of a TCI state pool (e.g., a pool list) through RRC signaling of a base station. A base station can configure type information of a TCI state for a terminal. The type information can indicate joint DL / UL beam indication or separate DL / UL beam indication. The joint DL / UL beam indication can be referred to as "joint indication" or "joint type." The separate DL / UL beam indication can be referred to as "separate indication" or "separate type."

[0118] When a joint type (e.g., joint indication) is configured, a TCI state (e.g., one TCI state) for DL and UL can be configured. In other words, DL TCI state configuration and UL TCI state configuration can be the same. A terminal can expect that a TCI state indicated by an information element included in PDSCH configuration information is applied to both DL (e.g., DL signal / channel) and UL (e.g., UL signal / channel). The term "signal / channel" can refer to a signal and / or a channel. When a separate type (e.g., separate indication) is configured, TCI states for DL and UL can be configured separately. In other words, DL TCI state configuration can be distinguished from UL TCI state configuration. A terminal can expect that a UL TCI state indicated by an information element included in UL BWP configuration information is applied to UL (e.g., UL signal / channel). The UL signal / channel can include PUSCH, PUCCH, and / or SRS.

[0119] After a pool of TCI states (e.g., a list of TCI states) configured (e.g., indicated) through RRC signaling, a base station can indicate a TCI state (e.g., an application of a TCI state) with DCI (e.g., DCI signaling). Due to a constraint of a DCI size (e.g., bits of a DCI field), a base station can preferentially activate a candidate TCI state with MAC signaling (e.g., MAC CE signaling). In other words, a candidate TCI state can be preferentially activated through a MAC CE until a certain number (e.g., a maximum number) that can be indicated or configured through a DCI.

[0120] For an activated candidate TCI state, according to a TCI state type (e.g., a joint type or a separate type), a DCI can include a codepoint value corresponding to a single TCI state or two TCI states. When a joint type is configured, a codepoint value corresponding to a single TCI state can be delivered through a DCI. When a separate type is configured, a codepoint value corresponding to two TCI states can be delivered through a DCI.

[0121] A PDSCH reception operation in a communication system supporting a unified TCI framework can be performed as follows. A terminal can receive a DCI and can identify indication information of a TCI state included in the DCI. The terminal can expect to receive a PDSCH by applying a TCI state indicated (e.g., configured) by the DCI after a certain duration (e.g., a beam application time (BAT)). On the other hand, the PDSCH can be transmitted before the BAT elapses. For receiving the PDSCH before the BAT elapses, a TCI selection field can be introduced. Based on the TCI selection field, the terminal can expect to receive the PDSCH before the BAT elapses. In other words, the TCI selection field can dynamically indicate to receive the PDSCH before the BAT elapses. The TCI selection field can be included in the DCI. Whether the TCI selection field exists in the DCI can be predefined by RRC signaling. The terminal can determine whether the DCI includes the TCI selection field based on a configuration of the RRC signaling.

[0122] Irrespective of whether the TCI selection field exists in the DCI, the terminal can receive the DCI (e.g., a PDCCH), can decode information included in the DCI, and can configure a beam for PDSCH reception based on the decoded information. The configuration of the beam can refer to a determination of a TCI state. A capability of the terminal to configure a beam for PDSCH reception can vary according to the terminal. In a PDSCH reception procedure of a single-DCI-based mTRP communication, a time (e.g., a minimum time) required for an application of a TCI state can vary according to the terminal, and accordingly, a rule for configuration of a beam for PDSCH reception can be required.

[0123] Figure 9 is a conceptual diagram illustrating a method of receiving a PDSCH based on a capability of supporting a default beam in single-DCI based mTRP communication.

[0124] As Figure 9 indicated, single-DCI based mTRP communication can be performed in an FR2 band. In case A, a terminal can support M default beams, and in case B, the terminal can not support the M default beams. M can be 2. Alternatively, M can be 2 or more. The M default beams can be pre-configured in the terminal. The default beam can refer to a beam for PDCCH reception. The terminal supporting the M default beams can report a capability of the M default beams (e.g., M default beams for single-DCI based mTRP communication) to a base station. The terminal not supporting the M default beams can be a terminal that has not reported a capability of the M default beams (e.g., M default beams for single-DCI based mTRP communication) to the base station. In case A, the terminal can apply a TCI state based on a rule defined per DCI format regardless of a scheduling offset (e.g., a time offset) between a DCI and a PDSCH, and can expect to receive the PDSCH based on the application of the TCI state. According to the context, "expect to receive the PDSCH" can be interpreted as "receive the PDSCH". The default beam can refer to a beam of the terminal used when TCI configuration information does not exist in a DCI. Alternatively, the default beam can refer to a beam of the terminal used when application of the TCI configuration information is not possible. The TCI configuration information can include TCI related information configured by a TCI field (e.g., a TCI state field), a TCI selection field, or a MAC CE and / or TCI related information configured by RRC signaling.

[0125] In case B, an operation (e.g., a beam configuration operation) of the terminal can vary according to a time domain position of a PDSCH occasion. When a PDSCH occasion exists before an end time of a scheduling offset (e.g., a time offset), the terminal can use a jointly / DL TCI state indicated by a first indication for receiving a PDSCH from an mTRP. The end time of the scheduling offset can indicate an application time of TCI configuration information. In other words, the end time of the scheduling offset can correspond to a BAT. When the PDSCH occasion exists after the end time of the scheduling offset, the terminal can apply a TCI state based on a rule defined per DCI format, and can expect to receive the PDSCH (e.g., a scheduled PDSCH) based on the application of the TCI state.

[0126] For application of the TCI state, a definition of a scheduling offset can be required. For example, a definition of a start time, an end time, and / or a duration of the scheduling offset can be required. When the scheduling offset is not explicitly defined, the configuration (e.g., application) of the TCI state can vary according to a reference time of the PDCCH reception and / or a reference time of the scheduled / activated PDSCH reception. In other words, when the scheduling offset is not explicitly defined, ambiguity can occur regarding the configuration (e.g., application) of the TCI state. Accordingly, the configuration (e.g., application) of the TCI state can vary according to the terminal. Whether to apply a default beam can be determined according to the definition of the scheduling offset.

[0127] In an exemplary embodiment of the present application, a method of configuring a beam of a terminal for PDSCH reception in single-DCI-based mTRP communication will be described. The method of configuring a beam of a terminal for PDSCH reception in single-DCI-based mTRP communication can also be applied to beam configuration of a terminal for PDSCH reception in multi-DCI-based mTRP communication. The mTRP communication can refer not only to communication with two TRPs but also to communication with three or more TRPs. A unified TCI framework can be supported in sTRP communication and / or mTRP communication. In single-DCI-based mTRP communication, a base station can configure data transmission from mTRPs for a terminal by utilizing a single DCI (e.g., a single PDCCH). The base station can transmit, to the terminal, information on a reception beam (e.g., a reception beam of the terminal) of a data channel (e.g., a PDSCH) transmitted from each TRP and information for decoding of the data channel. In general, a TCI state indicated (e.g., configured) by the DCI can be applied to a channel existing after the BAT elapses.

[0128] When the DCI includes indication information (e.g., TCI configuration information) of the TCI state and PDSCH scheduling information, the TCI state indicated by the DCI can also be applied to the PDSCH reception before the BAT elapses. In other words, in a duration from a reception time of the DCI to a time defined by the BAT, the terminal can receive the PDSCH based on the TCI state indicated by the DCI. To support the above-described operation, a DCI format (e.g., DCI format 1_1, DCI format 1_2) including the PDSCH scheduling information can dynamically configure a reception beam for the PDSCH with an additional bit (e.g., a TCI selection field).

[0129] The time required for the configuration of the reception beam of the PDSCH can vary depending on the terminal based on the time required for decoding the PDCCH and / or the decoding result of the PDCCH. For example, the beam configuration operation of the PDSCH existing within the required time (e.g., before the required time elapses) and the beam configuration operation of the PDSCH existing outside the required time (e.g., after the required time elapses) can be different. The beam configuration operations can be distinguished based on a threshold (e.g., a duration).

[0130] In the disclosure, depending on the context, the application of the TCI state can refer to the configuration of the reception beam, the configuration of the transmission beam, and / or the application of quasi co-location (QCL) for resources. In other words, the application of the TCI state, the configuration of the reception beam, the configuration of the transmission beam, and / or the application of QCL for resources can be used interchangeably.

[0131] - Proposed method #1: Definition of a scheduling offset (e.g., time offset, timing offset, etc.) and / or a duration (e.g., threshold) In the PDSCH reception procedure based on the single-DCI mTRP communication, the operation of configuring the TCI state of the terminal can vary depending on the duration (e.g., gap, scheduling offset, etc.) between the PDCCH (e.g., DCI) delivering the PDSCH resource information (e.g., PDSCH scheduling information) and the TCI configuration information and the PDSCH scheduled by the PDCCH. The duration (e.g., threshold) can refer to "the time (e.g., minimum time) required for the reception operation (e.g., decoding operation) of the PDCCH + the time (e.g., minimum time) required for applying the TCI state indicated by the PDCCH to the scheduled PDSCH reception." The time required for applying the TCI state indicated by the PDCCH to the scheduled PDSCH reception can refer to the time required for the reception preparation of the PDSCH based on the PDCCH (e.g., DCI). The duration can be used for the PDSCH reception scheduled by the PDCCH independently of other DL channels and / or UL channels.

[0132] The terminal supporting M default beams can apply the TCI state regardless of the duration. The terminal not supporting M default beams can consider the duration to apply the TCI state. M can be a natural number of 2 or more. The duration can be applied to the terminal not supporting M default beams. In other words, in the terminal not supporting M default beams, the duration can refer to "the time (e.g., minimum time) required for the reception operation (e.g., decoding operation) of the PDCCH + the time (e.g., minimum time) required for applying the TCI state indicated by the PDCCH to the scheduled PDSCH reception."

[0133] The duration can vary according to the capability of the terminal. The terminal can transmit information about the duration to the base station. The base station can receive information about the duration from the terminal. The information about the duration can be transmitted in a UE capability reporting procedure. The base station can consider the duration to schedule PDSCH for the terminal. The base station can consider the duration to determine a start time and / or an end time of a scheduling offset for the terminal, and can transmit information about the determined start time and / or end time to the terminal through signaling. The base station can consider the duration to determine a start time of the duration for each terminal, and can transmit information about the determined start time to the terminal through signaling. The duration can be configured in units of a symbol, a slot, or a subframe. The time required for a decoding operation and / or a beam switching operation can be within a time corresponding to one slot, and thus the duration can be reported in units of a symbol.

[0134] The duration can be scaled according to a numerology (e.g., SCS). The terminal can report the duration for each SCS to the base station. To reduce signaling overhead of the duration, the terminal can report the duration for a representative SCS to the base station. The base station can receive information about the duration for the representative SCS from the terminal, and can derive (e.g., estimate) the duration for another SCS based on the duration for the representative SCS. For example, the base station can derive an increased duration or a decreased duration for another SCS based on the duration for the representative SCS. The duration can be proportional or inversely proportional to the SCS.

[0135] The terminal can receive PDSCH from mTRPs in component carriers (CCs) having the same numerology (e.g., the same SCS). Alternatively, the terminal can receive PDSCH from mTRPs in CCs having different numerologies. For beam configuration for receiving PDSCH having the same numerology as PDCCH, no additional time can be required. Due to a numerology change, a compensation time can be required to configure a beam for PDSCH (e.g., PDSCH reception) with a different numerology. In other words, the compensation time can be an additional time required for beam configuration for PDSCH having a different numerology. PDSCH having a different numerology can be received in aggregated CCs having different numerologies. The compensation time can be added to the duration reported by the terminal. The base station can consider the duration reflecting the compensation time to schedule PDSCH.

[0136] - Proposed Method #2: Reference Point for Duration and Scheduling Offset An interval (e.g., gap) between a PDSCH occasion and a time (e.g., reception time) of a PDCCH scheduling the PDSCH occasion can be defined as an offset (e.g., scheduling offset). The terminal can compare the scheduling offset with a duration (e.g., threshold), and can apply the TCI state based on a comparison result. In other words, the terminal's operation for applying the TCI state can vary according to the duration. There can be ambiguity regarding a length (e.g., start time and / or end time) of the scheduling offset. When there is no explicit reference point defined for the scheduling offset, a first terminal can determine (e.g., calculate) the scheduling offset based on a start symbol of the PDCCH, and can compare the determined scheduling offset with the duration. A second terminal can determine (e.g., calculate) the scheduling offset based on an end symbol of the PDCCH, and can compare the determined scheduling offset with the duration. When there is no explicit reference point for the duration, the duration can start from the start symbol or the end symbol of the PDCCH. In this case, there can be ambiguity in a comparison result between the scheduling offset and the duration.

[0137] Figure 10 is a conceptual diagram illustrating a method of receiving a PDSCH based on different reference points.

[0138] As Figure 10 indicated, a single-DCI based mTRP communication can be performed in an FR2 band. A base station can transmit a scheduling DCI (e.g., DCI format 1_x) to a terminal via mTRP. The terminal can receive the base station's scheduling DCI via mTRP. In DCI 1_x, x can be an integer of 0 or more. In case C, a duration (e.g., threshold) can start from a start time (e.g., start position, start symbol, etc.) of the DCI format 1_x. In case D, the duration (e.g., threshold) can start from an end time (e.g., end position, end symbol, etc.) of the DCI format 1_x.

[0139] When the end time of the scheduling offset is earlier than the end time of the duration (e.g., when the offset is smaller than the duration), the terminal can apply the first indicated TCI state (e.g., the first indicated joint / DL TCI state) to the scheduled PDSCH (e.g., PDSCH reception). The first indicated TCI state can be pre-configured by the base station. The terminal can have two indicated TCI states, and the first indicated TCI state can be one of the two indicated TCI states. In the present invention, the term "indicated TCI state" and the term "indicated joint / DL TCI state" can be used interchangeably. For example, the indicated TCI state can be interpreted as the indicated joint / DL TCI state according to the context, and the indicated joint / DL TCI state can be interpreted as the indicated TCI state according to the context. The indicated TCI state can be used as a concept including the indicated joint / DL TCI state.

[0140] When the end time of the scheduling offset is later than the end time of the duration (e.g., when the offset is greater than the duration), the terminal can apply the TCI state to the scheduled PDSCH based on the RRC configuration. In other words, according to the RRC configuration, the terminal can receive the PDSCH based on "the TCI state indicated by the TCI configuration information included in the DCI" or "the TCI state indicated by the RRC message and / or the MAC CE".

[0141] In case C, the start position of the duration can be the start position of the PDCCH (e.g., DCI format 1_x), and in case C-1 of case C, the start position of the scheduling offset can be equal to the start position of the PDCCH (e.g., DCI format 1_x), and in case C-2 of case C, the start position of the scheduling offset can be equal to the end position of the PDCCH (e.g., DCI format 1_x). The length of the scheduling offset in case C-1 can be equal to the length of the scheduling offset in case C-2. In case C-1 of case C, the terminal can apply the first indicated joint / DL TCI state to the PDSCH reception. In case C-2 of case C, according to the RRC configuration, the terminal can apply "the TCI state indicated by the TCI configuration information included in the DCI" or "the TCI state indicated by the RRC message and / or the MAC CE" to the PDSCH reception. Even when the start position of the duration is the same, different TCI states can be applied when the start position of the scheduling offset varies.

[0142] In case C and case D, the start position of the duration can be different. When the start position of the duration is different, the configuration of the reception beam for PDSCH reception can vary. In case C-2 of case C, since the end time of the scheduling offset is later than the end time of the duration, according to the RRC configuration, the terminal can apply the "TCI state indicated by the TCI configuration information included in the DCI" or the "TCI state indicated by the RRC message and / or the MAC CE" to the PDSCH reception. In case D-2 of case D, since the end time of the scheduling offset is earlier than the end time of the duration, the terminal can apply the first indicated joint / DL TCI state to the PDSCH reception.

[0143] In a case such as case C and / or case D, the PDSCH reception performance can vary according to the terminal, and the base station can not know the state of the reception beam configuration of the terminal. To solve this problem, it can be necessary to explicitly define the start position (e.g., start time) of the scheduling offset and / or the duration. The start position of the scheduling offset and / or the duration can be the start symbol (e.g., first symbol) or the end symbol (e.g., last symbol) of the PDCCH. Alternatively, the start position of the scheduling offset and / or the duration can be the start symbol (e.g., first symbol) or the end symbol (e.g., last symbol) of the search space (or the CORESET associated with the search space) in which the PDCCH is transmitted.

[0144] The start position of the scheduling offset and the start position of the duration can be identically configured. In other words, in order to clearly calculate the scheduling offset and / or a simple comparison between the scheduling offset and the duration, the start position of the scheduling offset and the start position of the duration can be identically configured. According to the definition of the duration, the end position of the scheduling offset can be the start symbol (e.g., first symbol) or the end symbol (e.g., last symbol) of the PDSCH. When the duration is defined as including the time required to apply the indicated / configured TCI state to the PDSCH reception, the start symbol of the PDSCH can be regarded as the end position of the scheduling offset.

[0145] When no start position for the duration is defined, the terminal and / or base station may consider the start position of the duration to be the same as the start position of the scheduling offset. When no start position for the scheduling offset is defined, the terminal and / or base station may consider the start position of the scheduling offset to be the same as the start position of the duration. In another method, when no start position for the duration is defined, the terminal and / or base station may consider the start position of the duration as the start or end position of the PDCCH. When no start position for the scheduling offset is defined, the terminal and / or base station may consider the start position of the scheduling offset as the start or end position of the PDCCH, and the terminal and / or base station may consider the end position of the scheduling offset as the start or end position of the PDSCH timing.

[0146] Exemplary embodiments of the present invention can be applied not only to licensed bands but also to unlicensed bands. Duration and / or scheduling offset can be configured for each panel (e.g., an antenna array), and communication through each panel can be performed based on the duration and / or scheduling offset of the responding panel. The terminal can report information about the duration of each panel to the base station. Alternatively, the terminal can report information about a common duration for the panels to the base station. The duration of each panel can be determined based on the common duration and a specific offset.

[0147] Figure 11 This is a sequence diagram illustrating the method for transmitting and receiving data channels in mTRP communication based on a single DCI.

[0148] like Figure 11 As shown, the communication system may include a base station, a first TRP, a second TRP, and a terminal. The communication system may support mTRP communication based on a single DCI and / or mTRP communication based on multiple DCIs. A TCI state list (e.g., dl-OrJointTCI- StateList The TCI status list can be configured to the terminal. The TCI status list can be configured to the terminal via RRC signaling from the base station (e.g., RRC configuration). The terminal can have two indicated TCI statuses. The two indicated TCI statuses can include a first indicated TCI status and a second indicated TCI status.

[0149] The terminal can transmit at least one of "information indicating whether the terminal supports two default beams (e.g., two default beams for single-DCI based mTRP communication)" or "information on a duration" to the base station via the first TRP and / or the second TRP (S1101). The base station can receive at least one of "information indicating whether the terminal supports two default beams" or "information on a duration" from the terminal (S1101). Step S1101 can correspond to a reporting procedure of UE capability information. The two default beams can be two default beams for single-DCI based mTRP communication. The duration can refer to a duration for QCL. In other words, the duration can indicate a BAT (e.g., an application time of a TCI field and / or a TCI selection field).

[0150] The duration can be configured for each SCS. For example, the terminal can transmit information on a duration for SCS 60 kHz and / or information on a duration for SCS 120 kHz to the base station. The duration for SCS 60 kHz can be configured as 7 symbols, 14 symbols, or 28 symbols. The duration for SCS 120 kHz can be configured as 14 symbols or 28 symbols. The duration can be configured to include a compensation time. The compensation time can be a time required due to a change in a numerology of beam configuration for PDSCH reception with different numerologies.

[0151] When there is downlink data destined for the terminal, the base station can generate DCI (e.g., DCI format 1_x) including PDSCH scheduling information for the terminal (S1102). The DCI can further include TCI configuration information (e.g., a TCI field and / or a TCI selection field). The base station can generate the PDSCH scheduling information considering the duration received from the terminal. For example, the base station can schedule the PDSCH such that a PDSCH occasion exists after the duration. The PDSCH scheduling information can include time resource allocation information and / or frequency resource allocation information for the PDSCH occasion. The duration can be predefined in the base station and / or the terminal to start from a start position (e.g., a start symbol) or an end position (e.g., an end symbol) of the DCI.

[0152] In another method, the terminal can determine a start position of the duration (e.g., a start symbol or an end symbol of the DCI), and can transmit information indicating the determined start position of the duration to the base station. For example, the information indicating the determined start position of the duration can be transmitted at step S1101. In another method, the base station can determine a start position of the duration (e.g., a start symbol or an end symbol of the DCI), and can transmit information indicating the determined start position of the duration to the terminal through signaling (e.g., RRC signaling, MAC signaling, and / or PHY signaling). The information indicating the determined start position of the duration can be transmitted to the terminal after step S1101. The information indicating the determined start position of the duration can be included in an RRC message, a MAC CE, and / or a DCI transmitted by the base station.

[0153] The base station can transmit the DCI to the terminal via the first TRP or the second TRP (S1103). In other words, the DCI can be transmitted to the terminal via one TRP. The terminal can receive the DCI of the base station via the first TRP or the second TRP (S1103). The terminal can identify information (e.g., PDSCH scheduling information, a TCI field, a TCI selection field, etc.) included in the DCI.

[0154] The terminal can identify an offset (e.g., a scheduling offset) between a reception time of the DCI and a reception time (e.g., a PDSCH occasion) of a PDSCH scheduled by the DCI based on the PDSCH scheduling information included in the DCI (S1104). The scheduling offset can be determined based on one of the schemes defined in Table 2 below.

[0155] [Table 2] The base station can determine one of the schemes 1-1 to 1-4 defined in Table 2, and can transmit information indicating that the determined one scheme is used to the terminal through signaling. For example, the information indicating the scheme determined by the base station can be included in an RRC message, a MAC CE, and / or a DCI. The terminal can determine the scheduling offset based on the scheme indicated by the base station. In another method, the terminal can determine one of the schemes 1-1 to 1-4 defined in Table 2, and can transmit information indicating that the determined one scheme is used to the base station through signaling. The operation of informing the base station of the determined one scheme can be omitted. The terminal can determine the scheduling offset based on the determined one scheme.

[0156] The schemes in Table 2 can be configured to be associated with the information indicating the start time of the duration. For example, Table 3 can be configured.

[0157] [Table 3] The base station can determine one of the schemes 2-1 to 2-8 defined in Table 3, and can transmit information indicating the use of the determined one scheme to the terminal through signaling. For example, the information indicating the scheme determined by the base station can be included in an RRC message, a MAC CE, and / or a DCI. The terminal can determine the scheduling offset based on the scheme indicated by the base station. In another method, the terminal can determine one of the schemes 2-1 to 2-8 defined in Table 3, and can transmit information indicating the use of the determined one scheme to the base station through signaling. The operation of informing the base station of the determined one scheme can be omitted. The terminal can determine the scheduling offset based on the determined one scheme.

[0158] The terminal (e.g., a terminal that does not support two default beams) can compare the duration and the scheduling offset at step S1105, and can determine a TCI state applied to PDSCH reception based on a comparison result. The terminal that does not support two default beams can refer to a terminal that does not report a capability for two default beams for single-DCI based mTRP communication to the base station. When the terminal supports two default beams (e.g., when the terminal reports a capability for two default beams for single-DCI based mTRP communication to the base station), the terminal can receive the PDSCH regardless of the comparison result between the duration and the scheduling offset. When the end time of the scheduling offset is earlier than the end time of the duration (e.g., when the PDSCH occasion starts before the end time of the duration), the terminal can determine to apply a first indicated TCI state (e.g., a first indicated joint / DL TCI state) to the PDSCH reception. The first indicated TCI state can be indicated to the terminal in advance through signaling (e.g., RRC signaling and / or MAC CE signaling) from the base station.

[0159] When the end time of the scheduling offset is later than the end time of the duration (e.g., when the PDSCH occasion starts after the end time of the duration), the terminal can determine to apply a TCI state indicated by a TCI field and / or a TCI selection field included in the DCI, a TCI state indicated by signaling (e.g., RRC signaling and / or MAC CE signaling) of the base station, or the first indicated TCI state to the PDSCH reception.

[0160] The TCI state indicated by the signaling of the base station (e.g., applyIndicatedTCIState ) can be the first indicated TCI state, the second indicated TCI state, or both the first indicated TCI state and the second indicated TCI state. When the end time of the scheduling offset is later than the end time of the duration and the PDSCH (e.g., the PDSCH occasion) is scheduled by the DCI format 1_0, the terminal can determine to apply the TCI state indicated by the signaling of the base station to the PDSCH reception.applyIndicatedTCIState may be applyIndicatedTCI-StateDCI-1-0 may be applyIndicatedTCI-StateDCI-1-0 may indicate the TCI state for PDSCH reception.

[0161] When the end time of the scheduling offset is later than the end time of the duration, the PDSCH (e.g., PDSCH occasion) is scheduled by DCI format 1_0, and the base station does not indicate the TCI state (e.g., when no joint / DL TCI state is configured for the terminal applyIndicatedTCIState ), the terminal can determine to apply the TCI state of the first indication to the PDSCH reception.

[0162] When the end time of the scheduling offset is later than the end time of the duration, the PDSCH (e.g., PDSCH occasion) is scheduled by DCI format 1_1 or DCI format 1_2, and the DCI format 1_1 or DCI format 1_2 does not include the TCI selection field, the terminal can determine to apply both the TCI state of the first indication and the TCI state of the second indication to the PDSCH reception.

[0163] When the end time of the scheduling offset is later than the end time of the duration, the PDSCH (e.g., PDSCH occasion) is scheduled by DCI format 1_1 or DCI format 1_2, and the DCI format 1_1 or DCI format 1_2 includes the TCI selection field, the terminal can determine the TCI state applied to the PDSCH reception based on the codepoint value of the TCI selection field. When the codepoint value of the TCI selection field is “00”, the terminal can determine to apply the TCI state of the first indication to the PDSCH reception (e.g., for all PDSCH DM-RS ports of the PDSCH occasion) among the two indicated joint / DL TCI states. When the codepoint value of the TCI selection field is “01”, the terminal can determine to apply the TCI state of the second indication to the PDSCH reception (e.g., for all PDSCH DM-RS ports of the PDSCH occasion) among the two indicated joint / DL TCI states. When the codepoint value of the TCI selection field is “11”, the terminal can determine to apply both the TCI states of the two indications to the PDSCH reception.

[0164] In step S1106, the base station can transmit the PDSCH to the terminal via the first TRP and / or the second TRP, and the terminal can receive the PDSCH based on the determined TCI state. The PDSCH can be transmitted in the PDSCH occasion scheduled by the DCI.

[0165] The operations of the method according to the exemplary embodiments of the present application can be implemented as computer readable programs or codes in a computer readable recording medium. The computer readable recording medium can include all types of recording devices storing data readable by a computer system. In addition, the computer readable recording medium can store and execute programs or codes that can be distributed in computer systems connected through a network and read by a computer in a distributed manner.

[0166] The computer readable recording medium can include a hardware device specially configured to store and execute program instructions, such as ROM, RAM, or flash memory. The program instructions can include not only machine language codes created by a compiler, but also high-level language codes that can be executed by a computer using an interpreter.

[0167] Although some aspects of the present application have been described in the context of a device, these aspects can also indicate corresponding descriptions according to a method, and a block or device can correspond to a step or feature of the method. Similarly, aspects described in the context of a method can be represented as corresponding blocks or items or features of a corresponding device. Some or all of the steps of the method can be performed by (or using) a hardware device such as a microprocessor, programmable computer, or electronic circuit. In some embodiments, one or more of the most important steps of the method can be performed by such a device.

[0168] In some exemplary embodiments, a programmable logic device such as a field programmable gate array can be used to perform some or all of the functions of the methods described herein. In some exemplary embodiments, a field programmable gate array can be operated with a microprocessor to perform one of the methods described herein. In general, the methods are preferably performed by a specific hardware device.

[0169] The description of the present application is merely exemplary in nature and, thus, variations thereof are intended to be within the scope of the present application. Such variations are not to be regarded as a departure from the spirit and scope of the present application. It will be appreciated that those skilled in the art, upon attaining an understanding of the nature of the application, can readily devise their own modifications to the basic inventive concept, without departing from the spirit and scope of the present application. Accordingly, it is intended that the application not be limited by the foregoing description, but be defined by the appended claims.

Claims

1. A method for a user equipment (UE), the method comprising: Downlink control information (DCI) from the base station is received via the first transmitting and receiving point (first TRP) or the second TRP. The scheduling offset between the DCI and the PDSCH timing scheduled by the DCI is determined based on the Physical Downlink Shared Channel (PDSCH) scheduling information included in the DCI. The state of one or more Transport Configuration Indicators (TCIs) for receiving one or more PDSCHs is determined based on the comparison between the scheduling offset and the duration. as well as One or more PDSCHs of the base station are received via at least one TRP of the first TRP or the second TRP, based on one or more TCI states.

2. The method according to claim 1, wherein, If the UE does not support two default beams, one or more TCI states are determined based on the comparison between the scheduling offset and the duration. If the UE supports two default beams, one or more TCI states are determined regardless of the comparison between the scheduling offset and the duration.

3. The method according to claim 1, wherein, Based on the fact that the end time of the scheduling offset is earlier than the end time of the duration, one or more TCI states used to receive one or more PDSCHs are determined as the TCI states of the first indication configured for the UE.

4. The method according to claim 1, wherein, Based on the fact that the end time of the scheduling offset is later than the end time of the duration and the DCI format is DCI format 1_0, one or more TCI states used to receive one or more PDSCHs are determined as one or more TCI states indicated by the signaling of the base station.

5. The method according to claim 1, wherein, Based on the fact that the end time of the scheduling offset is later than the end time of the duration, the DCI format is DCI format 1_0, and the base station signaling does not indicate one or more TCI states, one or more TCI states used to receive one or more PDSCHs are determined as the first indicated TCI state configured for the UE.

6. The method according to claim 1, wherein, Based on the fact that the end time of the scheduling offset is later than the end time of the duration, the DCI format is either DCI format 1_1 or DCI format 1_2, and DCI format 1_1 or DCI format 1_2 does not include a TCI selection field, which determines one or more TCI states used to receive one or more PDSCHs as the first indicated TCI state and the second indicated TCI state configured for the UE.

7. The method according to claim 1, wherein, Based on the fact that the end time of the scheduling offset is later than the end time of the duration, the DCI format is either DCI format 1_1 or DCI format 1_2, and DCI format 1_1 or DCI format 1_2 includes a TCI selection field, based on the code point value of the TCI selection field to determine one or more TCI states for receiving one or more PDSCHs.

8. The method of claim 1, further comprising: Determine the duration for which the indication is used to apply one or more TCI states; as well as Information about the duration is sent to the base station via at least one of the first TRP or the second TRP. The duration includes additional compensation time required for beam configuration of one or more PDSCHs with different parameter sets.

9. The method according to claim 1, wherein, The duration is determined based on the sum of the time required to receive the DCI and the time required to prepare to receive one or more PDSCHs based on the DCI, wherein the start time of the duration is equal to the start time or end time of the DCI, and the start time of the duration is pre-configured by at least one of the UE or base station.

10. The method according to claim 1, wherein, The start time of the scheduling offset is equal to the start or end time of the DCI, the end time of the scheduling offset is equal to the start or end time of the PDSCH timing, and each of the start and end times of the scheduling offset is pre-configured by at least one UE or base station.

11. A user equipment (UE) comprising at least one processor, wherein the at least one processor causes the UE to perform: Downlink control information (DCI) from the base station is received via the first transmitting and receiving point (first TRP) or the second TRP. The scheduling offset between the DCI and the timing of the Physical Downlink Shared Channel (PDSCH) scheduled by the DCI is determined based on the PDSCH scheduling information included in the DCI. The state of one or more Transport Configuration Indicators (TCIs) for receiving one or more PDSCHs is determined based on the comparison between the scheduling offset and the duration. as well as One or more PDSCHs of the base station are received via at least one TRP of the first TRP or the second TRP, based on one or more TCI states.

12. The UE according to claim 11, wherein, If the UE does not support two default beams, one or more TCI states are determined based on the comparison between the scheduling offset and the duration. If the UE supports two default beams, one or more TCI states are determined regardless of the comparison between the scheduling offset and the duration.

13. The UE according to claim 11, wherein, Based on the fact that the end time of the scheduling offset is earlier than the end time of the duration, one or more TCI states used to receive one or more PDSCHs are determined as the TCI states of the first indication configured for the UE.

14. The UE according to claim 11, wherein, Based on the fact that the end time of the scheduling offset is later than the end time of the duration and the DCI format is DCI format 1_0, one or more TCI states used to receive one or more PDSCHs are determined as one or more TCI states indicated by the signaling of the base station.

15. The UE according to claim 11, wherein, Based on the fact that the end time of the scheduling offset is later than the end time of the duration, the DCI format is DCI format 1_0, and the base station signaling does not indicate one or more TCI states, one or more TCI states used to receive one or more PDSCHs are determined as the first indicated TCI state configured for the UE.

16. The UE according to claim 11, wherein, Based on the fact that the end time of the scheduling offset is later than the end time of the duration, the DCI format is either DCI format 1_1 or DCI format 1_2, and DCI format 1_1 or DCI format 1_2 does not include a TCI selection field, which determines one or more TCI states used to receive one or more PDSCHs as the first indicated TCI state and the second indicated TCI state configured for the UE.

17. The UE according to claim 11, wherein, Based on the fact that the end time of the scheduling offset is later than the end time of the duration, the DCI format is either DCI format 1_1 or DCI format 1_2, and DCI format 1_1 or DCI format 1_2 includes a TCI selection field, based on the code point value of the TCI selection field to determine one or more TCI states for receiving one or more PDSCHs.

18. The UE according to claim 11, wherein, At least one processor further enables the UE to perform: Determine the duration for which the indication is used to apply one or more TCI states; as well as Information about the duration is sent to the base station via at least one of the first TRP or the second TRP. The duration includes additional compensation time required for beam configuration of one or more PDSCHs with different parameter sets.

19. The UE according to claim 11, wherein, The duration is determined based on the sum of the time required to receive the DCI and the time required to prepare to receive one or more PDSCHs based on the DCI, wherein the start time of the duration is equal to the start time or end time of the DCI, and the start time of the duration is pre-configured by at least one of the UE or base station.

20. The UE according to claim 11, wherein, The start time of the scheduling offset is equal to the start or end time of the DCI, the end time of the scheduling offset is equal to the start or end time of the PDSCH timing, and each of the start and end times of the scheduling offset is pre-configured by at least one UE or base station.

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