Method and apparatus for activating / deactivating TCI in MTRP system

Abstract

Methods and apparatus for activating / deactivating TCIs in an mTRP system are disclosed. The method performed by the UE comprises the steps of: receiving, from a base station, a TCI state activation / deactivation MAC CE indicating activation or deactivation of a TCI state; identifying one or more TRPs indicated by a TRP indication field included in the TCI state activation / deactivation MAC CE; identifying one or more TCI state IDs associated with the one or more TRPs on the basis of a TCI state ID field included in the TCI state activation / deactivation MAC CE; and activating or deactivating one or more TCI states having the one or more TCI state IDs.

Description

Technical Field

[0001] The present invention relates to an enhanced communication technology, and more particularly, to a technology for activating and / or deactivating a transmission configuration indicator (TCI) in a multi-transmission and reception point (mTRP) system. Background Art

[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.). 5G communication networks (e.g., New Radio (NR) communication networks) can support frequency bands below 6 GHz and frequency bands above 6 GHz. In other words, 5G communication networks can support frequency region 1 (FR1) bands and / or FR2 bands. Compared with LTE communication networks, 5G communication networks can support various communication services and scenarios. For example, usage scenarios of 5G communication networks may include enhanced Mobile BroadBand (eMBB), ultra-reliable low-latency communication (URLLC), massive machine type communication (mMTC), etc.

[0003] Compared to 5G communication networks, 6G communication networks can support a wide variety of communication services and scenarios. They can meet requirements for ultra-performance, ultra-bandwidth, ultra-space, ultra-precision, ultra-intelligence, and / or ultra-reliability. They can support multiple broadband frequencies and be applied to a variety of use cases, such as terrestrial communications, non-terrestrial communications, and sidelink communications.

[0004] On the other hand, multiple transmission and reception points (mTRPs) can be deployed in a communication network (e.g., a 5G communication network and / or a 6G communication network). The mTRPs can be geographically separated. The base station can communicate with the terminal using the mTRP. The mTRP technology can be used to solve problems such as reduced quality of service (QoS) for cell edge terminals and / or inter-cell interference. In an environment where non-line-of-sight (NLOS) paths are limited, the mTRP technology can be used to provide additional communication paths.

[0005] Communication based on mTRP can be performed based on a coherent joint transmission (CJT) scheme or a non-CJT (NCJT) scheme. In the CJT scheme, mTRP can perform cooperative communication based on a reliable backhaul link, and mTRP can provide synchronous communication services to the terminal. In the NCJT scheme, mTRP can provide communication services to the terminal without cooperation. For example, in the NCJT scheme, mTRP can independently perform operations such as scheduling, selection of a pre-coding matrix, and determination of a modulation and coding scheme (MCS).

[0006] In a communication network, a base station can configure the transmission configuration indicator (TCI) state for a single TRP (sTRP), but a method for configuring the TCI state for an mTRP has not yet been defined. Therefore, a method for configuring the TCI state for an mTRP may be needed, and a method for activating and / or deactivating the TCI state may also be needed. Summary of the Invention

[0007] Technical issues

[0008] The present invention is directed to providing methods and apparatus for activating and / or deactivating the TCI state in an mTRP system.

[0009] Technical Solution

[0010] A method of a user equipment (UE) according to an exemplary embodiment of the present invention for achieving the above-mentioned purpose may include: receiving a transmission configuration indicator (TCI) state activation / deactivation medium access control (MAC) control element (CE) from a base station, the TCI state activation / deactivation MAC CE indicating activation or deactivation of the TCI state; identifying one or more transmission and reception points (TRPs) indicated by a TRP indication field included in the TCI state activation / deactivation MAC CE; identifying one or more TCI state indexes (IDs) associated with one or more TRPs based on a TCI state ID field included in the TCI state activation / deactivation MAC CE; and activating or deactivating one or more TCI states having one or more TCI state IDs.

[0011] The TCI state activation / deactivation MAC CE may further include a serving cell identifier (ID) field, and one or more TRPs may be associated with the serving cell indicated by the serving cell ID.

[0012] The size of the TRP indication field may vary depending on the number of one or more TRPs associated with the serving cell, and when the number of one or more TRPs is M, the size of the TRP indication field may be M bits or log2M bits, where M may be a natural number.

[0013] The method may further include: receiving information indicating a TCI state type of a serving cell from a base station, wherein the TCI state type may be indicated as a joint TCI state type or an independent TCI state type, and the TCI state type of the serving cell may be applied to one or more TRPs associated with the serving cell.

[0014] The method may further include: receiving information indicating the TCI status type of the serving cell from the base station; and receiving information indicating the TCI status types of multiple TRPs from the base station, wherein the TCI status types of the multiple TRPs may be configured independently of the TCI status type of the serving cell, and one or more TRPs may belong to the multiple TRPs.

[0015] The method may further include receiving one or more simultaneous unified (U)-TCI-TRP-update lists from the base station, wherein activation or deactivation of the TCI status of each TRP belonging to the one or more simultaneous U-TCI-TRP-update lists may be performed simultaneously.

[0016] The method may further include: in response to one or more simultaneous U-TCI-TRP-update lists being configured by the base station, identifying a simultaneous U-TCI-TRP-update list to which one or more TRPs belong in the one or more simultaneous U-TCI-TRP-update lists; identifying all TRPs belonging to the identified simultaneous U-TCI-TRP-update lists; and activating or deactivating the TCI state for the remaining TRPs among all the identified TRPs that do not include the one or more TRPs.

[0017] When one or more TRPs include a first TRP and a second TRP, the TCI state activation / deactivation MAC CE may include: a downlink (DL) bandwidth part (BWP) 1 field indicating a first DL BWP for the first TRP, an uplink (UL) BWP 1 field indicating a first UL BWP for the first TRP, a DL BWP 2 field indicating a second DL BWP for the second TRP, and a UL BWP 2 field indicating a second UL BWP for the second TRP.

[0018] When the one or more TRPs include a first TRP and a second TRP, the TCI state activation / deactivation MAC CE may include a DL BWP field indicating a DL BWP for the first TRP and the second TRP, and a UL BWP field indicating a UL BWP for the first TRP and the second TRP.

[0019] A method for a base station according to an exemplary embodiment of the present invention for achieving the above-mentioned purpose may include: generating a transmission configuration indicator (TCI) state activation / deactivation medium access control (MAC) control element (CE), wherein the transmission configuration indicator (TCI) state activation / deactivation medium access control (MAC) control element (CE) includes a TRP indication field indicating one or more transmission and reception points (TRPs) and one or more TCI state index (ID) fields associated with the one or more TRPs; and sending a TCI state activation / deactivation MAC CE to a user equipment (UE), wherein the TCI state activation / deactivation MAC CE indicates the activation or deactivation of one or more TCI states associated with the one or more TRPs.

[0020] The TCI state activation / deactivation MAC CE may further include a serving cell identifier (ID) field, and one or more TRPs may be associated with the serving cell indicated by the serving cell ID.

[0021] The size of the TRP indication field may vary depending on the number of one or more TRPs associated with the serving cell, and when the number of one or more TRPs is M, the size of the TRP indication field may be M bits or log2M bits, where M may be a natural number.

[0022] The method may further include: sending information indicating the TCI state type of the serving cell to the UE, wherein the TCI state type may be indicated as a joint TCI state type or an independent TCI state type, and the TCI state type of the serving cell may be applied to one or more TRPs associated with the serving cell.

[0023] The method may further include: sending information indicating the TCI status type of the serving cell to the UE; and sending information indicating the TCI status types of multiple TRPs to the UE, wherein the TCI status types of the multiple TRPs may be configured independently of the TCI status type of the serving cell, and one or more TRPs may belong to the multiple TRPs.

[0024] The method may further include sending one or more simultaneous unified (U)-TCI-TRP-update lists to the UE, wherein activation or deactivation of the TCI status of each TRP belonging to the one or more simultaneous U-TCI-TRP-update lists may be performed simultaneously.

[0025] When one or more TRPs include a first TRP and a second TRP, the TCI state activation / deactivation MAC CE may include: a downlink (DL) bandwidth part (BWP) 1 field indicating a first DL BWP for the first TRP, an uplink (UL) BWP 1 field indicating a first UL BWP for the first TRP, a DL BWP 2 field indicating a second DL BWP for the second TRP, and a UL BWP 2 field indicating a second UL BWP for the second TRP.

[0026] When the one or more TRPs include a first TRP and a second TRP, the TCI state activation / deactivation MAC CE may include a DL BWP field indicating a DL BWP for the first TRP and the second TRP, and a UL BWP field indicating a UL BWP for the first TRP and the second TRP.

[0027] A user equipment (UE) according to an exemplary embodiment of the present invention for achieving the above-mentioned purpose may include: at least one processor, wherein the at least one processor may enable the UE to execute: receiving a transmission configuration indicator (TCI) state activation / deactivation medium access control (MAC) control element (CE) from a base station, the TCI state activation / deactivation MAC CE indicating activation or deactivation of the TCI state; identifying one or more transmission and reception points (TRPs) indicated by a TRP indication field included in the TCI state activation / deactivation MAC CE; identifying one or more TCI state indexes (IDs) associated with one or more TRPs based on a TCI state ID field included in the TCI state activation / deactivation MAC CE; and activating or deactivating one or more TCI states having one or more TCI state IDs.

[0028] At least one processor may further cause the UE to perform: receiving information indicating the TCI state type of the serving cell from the base station, wherein the TCI state type may be indicated as a joint TCI state type or an independent TCI state type, the TCI state type of the serving cell may be applied to one or more TRPs associated with the serving cell, and the serving cell may be indicated by a serving cell identifier (ID) field included in the TCI state activation / deactivation MAC CE.

[0029] At least one processor may further cause the UE to perform: receiving one or more simultaneous unified (U)-TCI-TRP-update lists from the base station, wherein activation or deactivation of the TCI status of each TRP belonging to the one or more simultaneous U-TCI-TRP-update lists may be performed simultaneously.

[0030] Beneficial effects

[0031] According to the present invention, a base station can send a TCI state activation / deactivation MAC CE to a terminal, where the TCI state activation / deactivation MAC CE indicates activation or deactivation of one or more TCI states for one or more TRPs. The terminal can receive the TCI state activation / deactivation MAC CE from the base station and, based on the information included in the TCI state activation / deactivation MAC CE, activate or deactivate the one or more TCI states for the one or more TRPs. According to the above operation, activation or deactivation of the TCI state for the TRP in the mTRP system can be efficiently performed. Therefore, the performance of the communication system can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a conceptual diagram illustrating a first exemplary embodiment of a communication system.

[0033] Figure 2 is a block diagram illustrating a first exemplary embodiment of a communication node constituting a communication system.

[0034] Figure 3 is a block diagram illustrating a first exemplary embodiment of a communication node performing communications.

[0035] Figure 4a is a block diagram illustrating a first exemplary embodiment of a transmit path.

[0036] Figure 4b is a block diagram illustrating a first exemplary implementation of a receive path.

[0037] Figure 5 is a conceptual diagram illustrating a first exemplary embodiment of a system frame in a communication system.

[0038] Figure 6 is a conceptual diagram illustrating a first exemplary embodiment of a subframe in a communication system.

[0039] Figure 7 is a conceptual diagram illustrating a first exemplary embodiment of time slots in a communication system.

[0040] Figure 8 is a conceptual diagram illustrating a first exemplary embodiment of time-frequency resources in a communication system.

[0041] Figure 9 is a conceptual diagram illustrating a first exemplary embodiment of a method for configuring a unified TCI state pool in an sTRP system.

[0042] Figure 10 is a conceptual diagram illustrating a first exemplary embodiment of a TCI state activation / deactivation MAC CE.

[0043] Figure 11a is a conceptual diagram illustrating a first exemplary embodiment of a method of configuring a TCI state type in an mTRP system.

[0044] Figure 11b is a conceptual diagram illustrating a second exemplary embodiment of a method of configuring a TCI state type in an mTRP system.

[0045] Figure 12 is a conceptual diagram illustrating a second exemplary embodiment of the TCI state activation / deactivation MAC CE.

[0046] Figure 13a is a conceptual diagram illustrating a third exemplary embodiment of a TCI state activation / deactivation MAC CE.

[0047] Figure 13b is a conceptual diagram illustrating a fourth exemplary embodiment of the TCI state activation / deactivation MAC CE. DETAILED DESCRIPTION

[0048] Since the present invention is susceptible to various modifications and may have a variety of forms, specific exemplary embodiments will be shown in the drawings and described in detail in the detailed description. However, it should be understood that it is not intended to limit the present invention to specific exemplary embodiments, but on the contrary, the present invention covers all modifications and alternative forms that fall within the spirit and scope of the present invention.

[0049] Relational terms such as first, second, etc. can be used to describe various elements, but these elements should not be limited by the terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of the present invention, a first component can be named a second component, and a second component can be similarly named a first component. The term "and / or" means any one or combination of multiple related and described matters.

[0050] In the present invention, “at least one of A and B” may 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” may mean “one or more of A or B” or “one or more of a combination of one or more of A and B”.

[0051] In the present invention, "(re)transmission" may refer to "transmission", "retransmission" or "transmission and retransmission", "(re)configuration" may refer to "configuration", "reconfiguration" or "configuration and reconfiguration", "(re)connection" may refer to "connection", "reconnection" or "connection and reconnection", and "(re)access" may refer to "access", "reaccess" or "access and reaccess".

[0052] When it is mentioned that a certain component is “coupled” or “connected” to another component, it should be understood that the certain component is directly “coupled” or “connected” to the other component, or another component may be provided therebetween. Conversely, when it is mentioned that a certain component is “directly coupled” or “directly connected” to another component, it should be understood that no other component is provided therebetween.

[0053] The terms used in the present invention are only used to describe specific exemplary embodiments and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly dictates otherwise. In the present invention, terms such as "including" or "having" are intended to indicate the presence of features, quantities, steps, operations, components, parts, or combinations thereof described in the specification, but it should be understood that these terms do not exclude the presence or addition of one or more features, quantities, steps, operations, components, parts, or combinations thereof.

[0054] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. Terms commonly used in dictionaries and already in dictionaries should be interpreted as having meanings that match the contextual meanings in the art. In this specification, unless explicitly defined, terms are not necessarily interpreted as having formal meanings.

[0055] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In describing the present invention, in order to facilitate a comprehensive understanding of the present invention, the same reference numerals refer to the same elements throughout the description of the accompanying drawings, and repeated descriptions thereof will be omitted. Operations according to the exemplary embodiments explicitly described in the present invention, as well as combinations of the exemplary embodiments, extensions of the exemplary embodiments, and / or variations of the exemplary embodiments may be performed. Some operations may be omitted, and the sequence of operations may be changed.

[0056] Even when describing a method (e.g., signal transmission or reception) performed at a first communication node among the communication nodes in the exemplary embodiment, the corresponding second communication node may also perform a method (e.g., signal reception or transmission) corresponding to the method performed at the first communication node. In other words, when describing the operation of a user equipment (UE), the corresponding base station may perform an operation corresponding to the operation of the UE. Conversely, when describing the operation of a base station, the corresponding UE may perform an operation corresponding to the operation of the base station.

[0057] A base station may be referred to by various terms, such as Node B, evolved Node B, 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) may be referred to by various terms, such as 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.

[0058] In the present invention, signaling may be one of higher layer signaling, MAC signaling, and physical (PHY) signaling, or a combination of two or more. A message used for higher layer signaling may be referred to as a "higher layer message" or a "higher layer signaling message." A message used for MAC signaling may be referred to as a "MAC message" or a "MAC signaling message." A message used for PHY signaling may be referred to as a "PHY message" or a "PHY signaling message." Higher layer signaling may refer to the operation of sending and receiving system information (e.g., a master information block (MIB), a system information block (SIB)) and / or an RRC message. MAC signaling may refer to the operation of sending and receiving a MAC control element (CE). PHY signaling may refer to the operation of sending and receiving control information (e.g., downlink control information (DCI), uplink control information (UCI), or sidelink control information (SCI)).

[0059] In the present invention, "configuration of an operation (e.g., a sending operation)" may refer to configuration information (e.g., information elements, parameters) required for the operation and / or signaling of information indicating the execution of the operation. "Configuration of information elements (e.g., parameters)" may refer to signaling of information elements. In the present invention, "signal and / or channel" may refer to a signal, a channel, or both a signal and a channel, and "signal" may be used to mean "signal and / or channel."

[0060] The communication network to which the exemplary embodiment is applied is not limited to the communication network described below, and the exemplary embodiment can be applied to various communication networks (e.g., 4G communication network, 5G communication network and / or 6G communication network). Here, "communication network" can be used interchangeably with the term "communication system".

[0061] Figure 1 is a conceptual diagram illustrating a first exemplary embodiment of a communication system.

[0062] like Figure 1As shown, the communication system 100 may include multiple 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 may further include: a core network (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (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 may include an access and mobility management function (AMF), a user plane function (UPF), a session management function (SMF), etc.

[0063] The plurality of communication nodes 110 to 130 may support communication protocols specified in the 3rd Generation Partnership Project (3GPP) standard (eg, LTE communication protocol, LTE-A communication protocol, NR communication protocol, etc.). The plurality of communication nodes 110 to 130 may support the following technologies: code division multiple access (CDMA), wideband CDMA (WCDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiplexing (OFDM), filtered OFDM, cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), single carrier FDMA (SC-FDMA), non-orthogonal multiple access (NOMA), generalized frequency division multiplexing (GFDM), filter bank multi-carrier (filter bank multi-carrier) The communication nodes may include a universal filtered multi-carrier (FBMC) technology, a universal filtered multi-carrier (UFMC) technology, a space division multiple access (SDMA) technology, etc. Each of the plurality of communication nodes may have the following structure.

[0064] Figure 2 is a block diagram illustrating a first exemplary embodiment of a communication node constituting a communication system.

[0065] like Figure 2As shown, the communication node 200 may include at least one processor 210, a memory 220, and a transceiver 230 connected to a network for performing communication. In addition, the communication node 200 may further include an input interface device 240, an output interface device 250, a storage device 260, etc. Each component included in the communication node 200 can communicate with each other when connected through a bus 270.

[0066] The processor 210 may execute a program stored in at least one of the memory 220 and the storage device 260. The processor 210 may be a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor on which the method according to the embodiment of the present invention is executed. Each of the memory 220 and the storage device 260 may be composed of at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory 220 may include at least one of a read-only memory (ROM) and a random access memory (RAM).

[0067] Reference again Figure 1 , the communication system 100 may 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 may 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 may form a macro cell, and each of the fourth base station 120-1 and the fifth base station 120-2 may form a small cell. The fourth base station 120-1, the third terminal 130-3, and the fourth terminal 130-4 may be within the cell coverage of the first base station 110-1. In addition, the second terminal 130-2, the fourth terminal 130-4, and the fifth terminal 130-5 may be within the cell coverage of the second base station 110-2. In addition, the fifth base station 120-2, the fourth terminal 130-4, the fifth terminal 130-5, and the sixth terminal 130-6 may be within the cell coverage of the third base station 110-3. In addition, the first terminal 130-1 may be within the cell coverage of the fourth base station 120-1, and the sixth terminal 130-6 may be within the cell coverage of the fifth base station 120-2.

[0068] Here, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may refer to a Node-B, an evolved Node-B (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 (TTR), or a base station. point (TP), transmission and reception point (TRP), etc.

[0069] Each of the multiple terminals 130-1, 130-2, 130-3, 130-4, 130-5 and 130-6 can refer to user equipment (UE), terminal equipment (TE), advanced mobile station (AMS), high reliability mobile station (HR-MS), terminal, access terminal, mobile terminal, station, subscriber station, mobile station, portable subscriber station, node, device, on-board unit (OBU), etc.

[0070] On the other hand, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may operate in the same frequency band or in different frequency bands. The plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may 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 may be connected to the core network via an ideal or non-ideal backhaul. Each of the multiple 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.

[0071] In addition, each of the multiple 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 frequency bands, sidelink communication (e.g., device-to-device (D2D) communication, proximity service (ProSe)), Internet of Things (IoT) communication, dual connectivity (DC), etc. Here, each of the multiple terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 can perform operations corresponding to the following: operations of the multiple base stations 110-1, 110-2, 110-3, 120-1, and 120-2, and operations supported by the multiple 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 SU-MIMO mode, and the fourth terminal 130-4 can receive a signal from the second base station 110-2 in SU-MIMO mode. Alternatively, the second base station 110-2 can transmit a signal to the fourth terminal 130-4 and the fifth terminal 130-5 in MU-MIMO mode, and the fourth terminal 130-4 and the fifth terminal 130-5 can receive a signal from the second base station 110-2 in MU-MIMO mode.

[0072] The first base station 110-1, the second base station 110-2, and the third base station 110-3 can transmit signals to the fourth terminal 130-4 in a CoMP transmission manner, and the fourth terminal 130-4 can receive signals from the first base station 110-1, the second base station 110-2, and the third base station 110-3 in a CoMP manner. In addition, each of the multiple base stations 110-1, 110-2, 110-3, 120-1, and 120-2 can exchange signals with the corresponding terminal 130-1, 130-2, 130-3, 130-4, 130-5, or 130-6 within the coverage area of ​​its cell in a CA manner. Each of base stations 110-1, 110-2, and 110-3 may 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 may perform sidelink communication under the control of the second base station 110-2 and the third base station 110-3, respectively.

[0073] On the other hand, a communication node that performs communication in a communication network may be configured as follows. Figure 3 The communication nodes shown may be Figure 2 A specific exemplary embodiment of a communication node is shown.

[0074] Figure 3 is a block diagram illustrating a first exemplary embodiment of a communication node performing communications.

[0075] like Figure 3 As shown, 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 send a signal to the second communication node 300b. The transmission processor 311 included in the first communication node 300a can receive data (e.g., data units) from the data source 310. The transmission processor 311 can receive control information from the 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 CE), or PHY control information (e.g., DCI, SCI).

[0076] The transmit processor 311 may generate data symbols by performing processing operations on data (e.g., encoding operations, symbol mapping operations, etc.). The transmit processor 311 may generate control symbols by performing processing operations on control information (e.g., encoding operations, symbol mapping operations, etc.). In addition, the transmit processor 311 may generate synchronization / reference symbols for synchronization signals and / or reference signals.

[0077] The Tx MIMO processor 312 may perform spatial processing operations (e.g., precoding operations) on data symbols, control symbols, and / or synchronization / reference symbols. The output of the Tx MIMO processor 312 (e.g., a symbol stream) may be provided to a modulator (MOD) included in transceivers 313a through 313t. The modulator may generate modulation symbols by performing processing operations on the symbol stream and may generate signals by performing additional processing operations (e.g., analog-to-analog conversion, amplification, filtering, upconversion, etc.) on the modulation symbols. The signals generated by the modulators of transceivers 313a through 313t may be transmitted via antennas 314a through 314t.

[0078] The signal transmitted by the first communication node 300a can be received at the antenna 364a to the antenna 364r of the second communication node 300b. The signal received at the antenna 364a to the antenna 364r can be provided to the demodulator (DEMOD) included in the transceiver 363a to the transceiver 363r. The demodulator (DEMOD) can obtain samples by performing processing operations on the signal (for example, filtering operations, amplification operations, down-conversion operations, digital conversion operations, etc.). The demodulator can perform additional processing operations on the samples to obtain symbols. The MIMO detector 362 can perform MIMO detection operations on the symbols. The receiving processor 361 can perform processing operations on the symbols (for example, deinterleaving operations, decoding operations, etc.). The output of the receiving processor 361 can be provided to the data sink ( ) 360 and controller 366. For example, data may be provided to data sink 360, and control information may be provided to controller 366.

[0079] On the other hand, the second communication node 300b can transmit a signal to the first communication node 300a. The transmit processor 368 included in the second communication node 300b can receive data (e.g., data units) from the 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.

[0080] The Tx MIMO processor 369 may perform spatial processing operations (e.g., precoding operations) on data symbols, control symbols, and / or reference symbols. The output of the Tx MIMO processor 369 (e.g., a symbol stream) may be provided to a modulator (MOD) included in transceivers 363a through 363t. The modulator may generate modulation symbols by performing processing operations on the symbol stream and may generate signals by performing additional processing operations (e.g., analog-to-analog conversion, amplification, filtering, and upconversion) on the modulation symbols. The signals generated by the modulators of transceivers 363a through 363t may be transmitted via antennas 364a through 364t.

[0081] 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 processing operations (e.g., filtering, amplification, down-conversion, and digital conversion) on the signal. 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 receive processor 319 can perform processing operations (e.g., deinterleaving, decoding, etc.) on the symbols. The output of the receive processor 319 can be provided to the data sink 318 and the controller 316. For example, data can be provided to the data sink 318, and control information can be provided to the controller 316.

[0082] Memory 315 and memory 365 may store data, control information, and / or program codes. Scheduler 317 may perform scheduling operations for communications. Figure 3 The processors 311, 312, 319, 361, 368, and 369 and the controllers 316 and 366 shown may be Figure 2 The processor 210 shown can be used to execute the methods described in the present invention.

[0083] Figure 4a is a block diagram illustrating a first exemplary embodiment of a transmission path, Figure 4b is a block diagram illustrating a first exemplary implementation of a receive path.

[0084] like Figure 4a and Figure 4bAs shown, a transmission path 410 may be implemented in a communication node transmitting a signal, and a reception path 420 may be implemented in a communication node receiving a signal. The 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 (N-point IFFT) block 413, a parallel-to-serial (P-to-S) block 414, a cyclic prefix (CP) addition block 415, and an up-converter (UC) 416. The 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 may be a natural number.

[0085] In the transmit path 410, information bits may be input to a channel coding and modulation block 411. The channel coding and modulation block 411 may perform encoding operations (e.g., low-density parity check (LDPC) encoding operations, polar coding operations, etc.) and modulation operations (e.g., quadrature phase shift keying (OPSK), quadrature amplitude modulation (QAM), etc.) on the information bits. The output of the channel coding and modulation block 411 may be a modulation symbol sequence.

[0086] The S-to-P block 412 may convert the frequency-domain modulation symbols into parallel symbol streams to generate N parallel symbol streams. N may be the IFFT size or the FFT size. The N-point IFFT block 413 may generate a time-domain signal by performing an IFFT operation on the N parallel symbol streams. The P-to-S block 414 may convert the output of the N-point IFFT block 413 (e.g., the parallel signal) into a serial signal to generate a serial signal.

[0087] The CP adding block 415 may insert a CP into the signal. The UC 416 may up-convert the frequency of the output of the CP adding block 415 to a radio frequency (RF) frequency. In addition, the output of the CP adding block 415 may be filtered in baseband before up-conversion.

[0088] The signal transmitted from transmit path 410 may be input to receive path 420. The operations in receive path 420 may be the inverse of those in transmit path 410. DC 421 may down-convert the frequency of the received signal to baseband frequency. CP removal block 422 may remove the CP from the signal. The output of CP removal block 422 may be a serial signal. S to P block 423 may convert the serial signal into parallel signals. N-point FFT block 424 may generate N parallel signals by performing an FFT algorithm. P to S block 425 may convert the parallel signals into a sequence of modulation symbols. Channel decoding and demodulation block 426 may perform a demodulation operation on the modulation symbols and may recover the data by performing a decoding operation on the result of the demodulation operation.

[0089] exist Figure 4a and Figure 4b In the present invention, discrete Fourier transform (DFT) and inverse DFT (IDFT) can be used instead of FFT and IFFT. Figure 4a and Figure 4b Each of the blocks (eg, components) in the embodiment may be implemented by at least one of hardware, software, or firmware. For example, Figure 4a and Figure 4b Some blocks in the may be implemented by software, and other blocks may be implemented by hardware or a combination of hardware and software. Figure 4a and Figure 4b In the , a block can be subdivided into multiple blocks, multiple blocks can be integrated into one block, some blocks can be omitted, and blocks that support other functions can be added.

[0090] Figure 5 is a conceptual diagram illustrating a first exemplary embodiment of a system frame in a communication system.

[0091] like Figure 5 As shown, time resources in a communication system can be divided on a frame basis. For example, system frames of a communication system can be configured continuously in the time domain. The length of a system frame can be 10 milliseconds (ms). The system frame number (SFN) can be set to one of #0 to #1023. In this case, 1024 system frames can be repeated in the time domain of the communication system. For example, the SFN of the system frame after system frame #1023 can be #0.

[0092] A system frame may include two half-frames. A half-frame may be 5 ms long. The half-frame at the beginning of the system frame may be referred to as "half-frame #0," and the half-frame at the end of the system frame may be referred to as "half-frame #1." A system frame may include 10 subframes. A subframe may be 1 ms long. The 10 subframes within a system frame may be referred to as subframe #0 to subframe #9.

[0093] Figure 6 is a conceptual diagram illustrating a first exemplary embodiment of a subframe in a communication system.

[0094] like Figure 6 As shown, a subframe may include n time slots, where n may be a natural number. Accordingly, a subframe may consist of one or more time slots.

[0095] Figure 7 is a conceptual diagram illustrating a first exemplary embodiment of time slots in a communication system.

[0096] like Figure 7 As shown, a time slot may include one or more symbols. For example, Figure 7 One slot shown in FIG may include 14 symbols. The length of a slot may vary according to the number of symbols included in the slot and the length of the symbol. Alternatively, the length of a slot may vary according to a parameter set (numerology).

[0097] The parameter sets applied to the physical signals and channels in the communication system may be variable. The parameter sets may be adjusted to meet various technical requirements of the communication system. In a communication system that applies OFDM waveform technology based on a cyclic prefix (CP), the parameter set may include a subcarrier spacing and a CP length (or CP type). Table 1 may illustrate a first exemplary embodiment of a method for configuring a parameter set for 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 may be supported. In addition, the communication system may support parameter sets not listed in Table 1.

[0098] [Table 1]

[0099]

[0100] When the subcarrier spacing is 15 kHz (e.g., μ = 0), the length of the time slot may be 1 ms. In this case, one system frame may include 10 time slots. When the subcarrier spacing is 30 kHz (e.g., μ = 1), the length of the time slot may be 0.5 ms. In this case, one system frame may include 20 time slots.

[0101] When the subcarrier spacing is 60 kHz (e.g., μ = 2), the length of the time slot may be 0.25 ms. In this case, one system frame may include 40 time slots. When the subcarrier spacing is 120 kHz (e.g., μ = 3), the length of the time slot may be 0.125 ms. In this case, one system frame may include 80 time slots. When the subcarrier spacing is 240 kHz (e.g., μ = 4), the length of the time slot may be 0.0625 ms. In this case, one system frame may include 160 time slots.

[0102] Symbols can be configured as downlink (DL) symbols, flexible (FL) symbols, or uplink (UL) symbols. A slot consisting only of DL symbols may be referred to as a "DL slot," a slot consisting only of FL symbols may be referred to as an "FL slot," and a slot consisting only of UL symbols may be referred to as a "UL slot."

[0103] The slot format can be semi-statically configured by higher layer signaling (e.g., RRC signaling). Information indicating the semi-static slot format can be included in the system information, and the semi-static slot format can be configured to be cell-specific. In addition, the semi-static slot format can be further configured for each terminal by terminal-specific high-layer signaling (e.g., RRC signaling). The flexible symbols in the cell-specific slot format can be overwritten as downlink symbols or uplink symbols by terminal-specific high-layer signaling. In addition, the slot format can be dynamically indicated by physical layer signaling (e.g., a slot format indicator (SFI) included in the DCI). The semi-statically configured slot format can be overwritten by the dynamically indicated slot format. For example, the semi-statically configured flexible symbols can be overwritten by the SFI as downlink symbols or uplink symbols.

[0104] Reference signals may include Channel State Information-Reference Signal (CSI-RS), Sounding Reference Signal (SRS), Demodulation-Reference Signal (DM-RS), and Phase Tracking-Reference Signal (PT-RS). Channels may include Physical Broadcast Channel (PBCH), Physical Downlink Control Channel (PDCCH), Physical Downlink Shared Channel (PDSCH), Physical Uplink Control Channel (PUCCH), Physical Uplink Shared Channel (PUSCH), Physical Sidelink Control Channel (PSCCH), and Physical Sidelink Shared Channel (PSSCH). In the present invention, the control channel may refer to PDCCH, PUCCH or PSCCH, and the data channel may refer to PDSCH, PUSCH or PSSCH.

[0105] Figure 8 is a conceptual diagram illustrating a first exemplary embodiment of time-frequency resources in a communication system.

[0106] like Figure 8 As shown, 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)". A REG can include K REs. REG can be used as a basic unit for resource allocation in the frequency domain. K can be a natural number. For example, K can be 12. N can be a natural number. Figure 7 In the time slot shown, N may be 14. N OFDM symbols may be used as a basic unit for resource allocation in the time domain.

[0107] In the present invention, RB may refer to a common RB (CRB). Alternatively, RB may refer to a physical RB (PRB) or a virtual RB (VRB). In a communication system, CRB may refer to an RB that constitutes a set of continuous RBs (e.g., a common RB grid) based on a reference frequency (e.g., point A). A carrier and / or bandwidth part may be mapped onto the common RB grid. That is, a carrier and / or bandwidth part may be configured with CRBs. The RBs or CRBs constituting the bandwidth part may be referred to as PRBs, and the CRB index may be appropriately converted to a PRB index within the bandwidth part.

[0108] Downlink data can be transmitted through PDSCH. The base station can send the configuration information of PDSCH (e.g., scheduling information) to the terminal through PDCCH. The terminal can obtain the configuration information of PDSCH by receiving PDCCH (e.g., downlink control information (DCI)). For example, the configuration information of PDSCH may include the modulation coding scheme (MCS) used for transmission / reception of PDSCH, time resource information of PDSCH, frequency resource information of PDSCH, and feedback resource information of PDSCH. PDSCH may refer to the radio resources for sending and receiving downlink data. Alternatively, PDSCH may refer to the downlink data itself. PDCCH may refer to the radio resources for sending and receiving downlink control information (e.g., DCI). Alternatively, PDCCH may refer to the downlink control information itself.

[0109] The terminal may monitor the PDCCH to receive the PDSCH transmitted from the base station. The base station may notify the terminal of configuration information for the PDCCH monitoring operation using a higher-layer message (e.g., a Radio Resource Control (RRC) message). The configuration information for the PDCCH monitoring operation may include control resource set (CORESET) information and search space information.

[0110] CORESET information may include PDCCH DMRS information, PDCCH precoding information, and PDCCH opportunity information. PDCCH DMRS may be a DMRS used to demodulate the PDCCH. A PDCCH opportunity refers to an area where a PDCCH may potentially exist, which means that it is an area where DCI can be transmitted. A PDCCH opportunity may also be referred to as a PDCCH candidate. PDCCH opportunity information may include time resource information and frequency resource information for the PDCCH opportunity. In the time domain, the length of the PDCCH opportunity may be indicated in symbols. In the frequency domain, the size of the PDCCH opportunity may be indicated in RB units (e.g., PRB units or CRB units).

[0111] The search space information may include a core set identifier (ID) associated with the search space, a periodicity for PDCCH monitoring, and / or an offset for PDCCH monitoring. The periodicity and offset for PDCCH monitoring may each be indicated in units of time slots. In addition, the search space information may further include an index of a symbol at which the PDCCH monitoring operation starts.

[0112] 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 notify the terminal of BWP configuration information using higher-layer signaling. Higher-layer signaling can refer to the transmission of system information and / or the transmission of RRC messages. The number of BWPs configured for a single terminal can be one or more. The terminal can receive BWP configuration information from the base station and identify the configured BWP based on the received configuration information. When multiple BWPs are configured for downlink communication, the base station can activate one or more of the multiple 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 downlink reception on the activated BWP.

[0113] On the other hand, a communication system (e.g., a communication network) may support a transmission and reception point (TRP)-based technology (e.g., multiple TRP (mTRP) technology and / or single TRP (sTRP) technology). A communication system that supports TRP technology may be referred to as a TRP system (e.g., an mTRP system and / or an sTRP system). In the present invention, "TRP" may have a meaning including "sTRP" and / or "mTRP", and depending on the context, "TRP" may refer to sTRP or mTRP. TRP may refer to an antenna set, an antenna group and / or an antenna array. TRP may be associated with a CORESET and / or a beam (e.g., a beam group).

[0114] The beam management process for TRP can be supported. The beam management process for TRP can be defined as a set of layer 1 (layer 1, L1) / layer 2 (layer 2, L2) processes for discovering and / or maintaining the optimal beam required for communication between TRP and the terminal. The beam management process for TRP can be classified into four detailed processes. For example, the beam management process for TRP can include a beam determination process, a beam measurement process, a beam reporting process, and a beam scanning process.

[0115] By utilizing the reciprocity characteristics of the channel (e.g., DL / UL channel) between the TRP and the terminal, the terminal can configure the Tx beam based on the measurement value of the Rx beam of the DL channel, and can configure the Rx beam based on the measurement value of the Tx beam of the UL channel. In the present invention, "DL / UL channel" may refer to a DL channel and / or a UL channel. The base station can configure the Tx beam based on the measurement value of the Rx beam of the UL channel, and can configure the Rx beam based on the measurement value of the Tx beam of the DL channel.

[0116] Regarding beam management associated with analog beamforming, a transmission configuration indicator (TCI) can be introduced to configure the terminal's receive beam for a specific channel / signal (e.g., PDSCH, CSI-RS, PDCCH, etc.). The base station can dynamically indicate quasi-co-location (QCL) information to the terminal using TCI. In order to reduce the signaling overhead of QCL configuration for DL / UL channels and / or simplify multi-beam operation, a TCI configuration using a unified TCI pool (e.g., a unified TCI framework) can be introduced into the communication system. In this case, the base station can pre-configure a common TCI pool commonly used for (applied to) DL channels and UL channels to the terminal through signaling (e.g., RRC signaling), and can indicate (e.g., activate or deactivate) the TCI belonging to the common TCI pool (e.g., TCI for DL ​​channels and UL channels) to the terminal using MAC CE and / or DCI.

[0117] Updates to TCI status (e.g., common TCI status) may be supported. TCI status (e.g., common TCI status) for multiple component carriers (CCs) may be indicated (e.g., configured). A reference CC may be configured among the multiple CCs. TCI updates for other CCs in a CC list may be performed based on a TCI update command for the reference CC. In other words, TCI updates for CCs in a CC list may be performed simultaneously based on a TCI update command for the reference CC.

[0118] The TCI state can be based on two schemes. The TCI state type can be configured as a joint TCI state type or an independent TCI state type. The TCI state type can refer to a unified TCI state type. In the present invention, the case where the TCI state type is configured as a joint TCI state type can be referred to as a case of utilizing a joint TCI state indication scheme, and the case where the TCI state type is configured as an independent TCI state type can be referred to as a case of utilizing an independent TCI state indication scheme. In the joint TCI state indication scheme, the joint TCI state for the DL channel and the UL channel can be indicated. In the independent TCI state indication scheme, the TCI state for each of the DL channel and the UL channel can be indicated independently. When there is reciprocity between the DL channel and the UL channel, the joint TCI state indication scheme can be used. When there is no reciprocity between the DL channel and the UL channel, the independent TCI state indication scheme can be used.

[0119] To ensure downlink communication reliability and / or improve transmission rates in the cell edge area, physical channels can be used on a TRP or panel basis. For example, physical channels can be used independently on a TRP or panel basis. Alternatively, physical channels can be shared by TRPs or panels. Communication based on the above scheme can be used in eMBB scenarios and / or URLLC scenarios.

[0120] In the mTRP system, in order to ensure the reliability of PDCCH transmission, PDCCH transmission can be performed based on different schemes according to the deployment of mTRP. For example, PDCCH transmission can be performed based on a single frequency network (SFN) scheme or a non-SFN (NSFN) scheme. In the SFN scheme, different TRPs or different panels can use the same resources (for example, the same time resources, the same frequency resources and / or the same spatial resources) to transmit the same PDCCH. In other words, all TRPs or all panels can use the same DMRS configuration, the same DMRS position and / or the same DMRS sequence to transmit PDCCH. In this case, the TCI state can be implicitly configured differently from the reception perspective for the TRP or panel. The above exemplary embodiment can be performed based on multiple TCI states of the CORESET. There may be synchronization constraints between TRPs for ideal backhaul or near-ideal backhaul.

[0121] In the NSFN scheme, the PDCCH generated by the corresponding TRP can be multiplexed (e.g., time and / or frequency multiplexed) within the same CORESET or different CORESETs, and the multiplexed PDCCH can be sent to the terminal. The above scheme may be a PDCCH repetition scheme based on mTRP. In the NSFN scheme, the coded bits to be delivered through a single PDCCH may be divided into multiple parts for TRP, each part having the same number of bits, and the bits specific to the TRP (e.g., coded bits) may be transmitted through different PDCCH candidates. The above scheme may be a PDCCH transmission scheme based on sTRP.

[0122] In the mTRP-based PDCCH repetition scheme, as many PDCCHs as the number of TRPs may be repeatedly generated, and the PDCCHs may be transmitted in the same search space (e.g., search space with the same index) within different search space sets having the same number of PDCCH candidates. In this case, the search space sets may exist within the same CORESET or within different CORESETs. Since one TCI state may be associated with each CORESET, when PDCCHs are transmitted in different search spaces within the same CORESET, only one TCI state may be indicated (e.g., configured) for PDCCHs transmitted in different search spaces. In this case, the terminal may receive a PDCCH from one TRP at a specific time.

[0123] When PDCCH is transmitted in the same search space within different CORESETs, the terminal may implicitly expect to receive PDCCH from sTRP or mTRPs depending on the number of TCI states (e.g., TCI states indicated or configured by the base station). In this case, a single PDCCH can be split by the number of TRPs, and the split PDCCHs can be transmitted in different PDCCH candidates. In this case, each aggregation level and the combined aggregation level can be the same. In the above exemplary embodiment, allocation to different CORESETs is possible. The size of the payload ultimately obtained by combining the split PDCCHs can be equal to the size of the payload of the PDCCH to be transmitted by the sTRP. Therefore, in terms of decoding complexity, the sTRP-based PDCCH transmission scheme can be more advantageous than the mTRP-based PDCCH repetition scheme.

[0124] Unified TCI (e.g., unified TCI state) can be applied to the mTRP system. In the mTRP system, it may be necessary to configure a unified TCI state pool. In the present invention, the TCI pool may refer to a unified TCI state pool.

[0125] Figure 9 is a conceptual diagram illustrating a first exemplary embodiment of a method for configuring a unified TCI state pool in an sTRP system.

[0126] like Figure 9As shown, the base station can configure the TCI state type (e.g., joint or independent TCI state type) to the terminal through signaling (e.g., RRC signaling). According to the joint TCI state indication scheme, the base station can configure the joint TCI state list (e.g., d1-OrJointTCI-StateList) applied to the DL channel and the UL channel to the terminal. The terminal can receive the joint TCI state list from the base station. According to the independent TCI state indication scheme, the base station can configure the DL TCI state list (e.g., d1-OrJointTCI-StateList) applied to the DL channel and the UL TCI state list (e.g., ul-TCI-StateList) applied to the UL channel to the terminal. The terminal can receive the DL TCI state list and the UL TCI state list from the base station. The TCI state pool for each TCI state list (e.g., joint TCI state list, DL TCI state list, and UL TCI state list) can be configured to the terminal through signaling (e.g., RRC signaling) of the base station. The base station can send selection information about the TCI state type to the terminal through signaling.

[0127] The base station can use MAC CE to indicate to the terminal the activation or deactivation of the TCI state (e.g., TCI pool) for each serving cell. The activation or deactivation of the TCI state (e.g., TCI pool) can be dynamically indicated. The base station can configure the terminal with a list of serving cells to which a unified TCI state activation / deactivation MAC CE is applied. For example, the base station can pre-configure the terminal with a simultaneous unified (U)-TCI-update list 1, a simultaneous U-TCI-update list 2, a simultaneous U-TCI-update list 3, and / or a simultaneous U-TCI-update list 4. Each of the simultaneous U-TCI-update lists may include one or more serving cells. Different simultaneous U-TCI-update lists may not include the same serving cell. In the present invention, "activation / deactivation" may refer to "activation and / or deactivation."

[0128] The base station may generate a simultaneous U-TCI-update list including serving cells configured with a unified TCI state type (e.g., unifiedTCI-State Type). The base station may transmit a joint TCI state indication or an independent TCI state indication for the serving cells belonging to the simultaneous U-TCI-update list. The terminal may activate or deactivate the TCI state based on the indication from the base station. Activation or deactivation of the TCI state for serving cells belonging to the same simultaneous U-TCI-update list may be performed simultaneously. Serving cells belonging to the simultaneous U-TCI-update list may not have different TCI type configurations.

[0129] Figure 10is a conceptual diagram illustrating a first exemplary embodiment of a TCI state activation / deactivation MAC CE.

[0130] like Figure 10 As shown, the base station can generate a TCI state activation / deactivation MAC CE indicating the activation or deactivation of the TCI state (for example, a unified TCI state), and can send the TCI state activation / deactivation MAC CE to the terminal. The TCI state activation / deactivation MAC CE can be transmitted on the PDSCH. For the above operations, the base station can pre-send a DCI scheduling PDSCH (TCI state activation / deactivation MAC CE is transmitted on the PDSCH) to the terminal. The TCI state activation / deactivation MAC CE can be a unified TCI state activation / deactivation MAC CE. The TCI state activation / deactivation MAC CE may include: a CORESET pool index (index, ID) field (or reserved (reserved, R) bit), a serving cell identifier (identifier, ID) field, a DLBWP index (ID) field, a UL BWP ID field, a P i field, D / U field, TCI state index (ID) field, and / or reserved (R) bit. The R bit may be set to 0. The terminal may receive a TCI state activation / deactivation MAC CE from the base station and may activate or deactivate the TCI state (e.g., unified TCI state) based on information (e.g., fields, information elements) included in the TCI state activation / deactivation MAC CE.

[0131] The CORESET Pool ID field may indicate that the mapping between the activated TCI state and the codepoint of the DCI (e.g., the TCI field included in the DCI) is specific to the CORESET (e.g., CORESET pool) for which the CORESET Pool ID is set. For example, a CORESET Pool ID field set to 1 may indicate that the TCI state is specific to CORESET Pool 1. A CORESET Pool ID field set to 0 may indicate that the TCI state is specific to CORESET Pool 0. Alternatively, the CORESET Pool ID field may be replaced by a reserved (R) bit. For example, in the case where the CORESET Pool ID is not set or only one CORESET Pool ID is set, the CORESET Pool ID field may be replaced by an R bit.

[0132] The Serving Cell ID field may indicate the identifier of the serving cell to which the TCI State Activation / Deactivation MAC CE is applied. When the serving cell indicated by the Serving Cell ID field (e.g., the serving cell having the physical cell identifier (PCI) indicated by the Serving Cell ID field) belongs to a specific simultaneous U-TCI-update list configured by the base station, the TCI State Activation / Deactivation MAC CE may be applied to all cells belonging to the specific simultaneous U-TCI-update list.

[0133] The DL BWP ID field may indicate the DL BWP to which the TCI state activation / deactivation MAC CE is applied. In other words, the DL BWP ID field may indicate a code point of a BWP indicator included in the DCI.

[0134] The UL BWP ID field may indicate the UL BWP to which the TCI state activation / deactivation MAC CE is applied. In other words, the UL BWP ID field may indicate the code point of the BWP indicator included in the DCI.

[0135] P i The field can indicate whether each TCI code point corresponds to multiple TCI states or a single TCI state. i The field may indicate that the i-th TCI code point corresponds to both the DL TCI state and the UL TCI state. i The field may indicate whether the i-th TCI code point corresponds to the DL / joint TCI state or the UL TCI state.

[0136] The D / U field may indicate whether the TCI State ID field belonging to the same octet as the D / U field is used for the combined / DL TCI state or the UL TCI state. A D / U field set to 1 may indicate that the TCI State ID field in the same octet as the D / U field is used for the combined / DL TCI state. A D / U field set to 0 may indicate that the TCI State ID field in the same octet as the D / U field is used for the UL TCI state.

[0137] The TCI State ID field may indicate a TCI state (eg, TCI state configuration) identified by TCI-StateId or TCI-UL-State-Id.

[0138] On the other hand, in the sTRP system, TRP can be interpreted as the serving cell, and Figure 10The serving cell ID in the mTRP can be interpreted as the ID of the TRP. In the mTRP system, the same TCI pool can be used regardless of the TRP. In other words, considering the overhead of RRC signaling for the TCI pool, the same TCI pool can be used regardless of the TRP. In the intra-TRP scenario where the mTRP is associated with the same PCI, the joint TCI status pool and the independent TCI status pool can be configured together. The joint TCI status pool and the independent TCI status pool can be configured by signaling of the base station (e.g., RRC signaling).

[0139] In an mTRP system, TRPs may be geographically separated. Accordingly, the link conditions between each TRP and the terminal may be different. In this case, the TCI state type may be configured differently for each TRP. In other words, the base station may independently configure the TCI state type for each TRP and may indicate the configured TCI state type to the terminal. For example, the TCI state type of TRP1 may be configured as a joint TCI state type, and the TCI state type of TRP 2 may be configured as an independent TCI state type. Due to the maximum permissible exposure (MPE) problem of the terminal, different configurations of the TCI state type for a specific TRP may be required. In this case, as in the above exemplary embodiment, the TCI state type may be independently configured for each TRP.

[0140] As another method, the configuration of the TCI state type of the serving cell (e.g., a joint or independent TCI state type) can be applied to the TRP associated with the serving cell (e.g., the PCI of the serving cell). In this case, the same TCI state type can be applied to both the serving cell and the TRP associated with the serving cell. Considering signaling overhead and / or system complexity, the method of applying the TCI state type of the serving cell to the TRP associated with the serving cell may be more appropriate than the method of independently configuring the TCI state type for each TRP.

[0141] Figure 11a is a conceptual diagram illustrating a first exemplary embodiment of a method of configuring a TCI state type in an mTRP system.

[0142] like Figure 11aAs shown, the first TRP and the second TRP may belong to the same serving cell. In other words, the first TRP and the second TRP may be associated with the same PCI (e.g., the PCI of the serving cell). The TCI status type of the serving cell may be applied to the TRPs associated with the serving cell (e.g., the first TRP and the second TRP). When the TCI status type of the serving cell is configured as a joint TCI status type, the terminal may interpret the TCI status type of the TRP associated with the serving cell as a joint TCI status type. When the TCI status type of the serving cell is configured as an independent TCI status type, the terminal may interpret the TCI status type of the TRP associated with the serving cell as an independent TCI status type. In order to support the above operations, the base station may signal to the terminal information indicating the use (e.g., support) of a method for applying the TCI status type of the serving cell to the TRP associated with the serving cell. In this case, the terminal may apply the TCI status type of the serving cell configured by the base station to the TRP associated with the serving cell based on an indication from the base station.

[0143] Figure 11b is a conceptual diagram illustrating a second exemplary embodiment of a method of configuring a TCI state type in an mTRP system.

[0144] like Figure 11b As shown, the first TRP and the second TRP may belong to the same serving cell or different serving cells. The TCI status type may be configured differently for each TRP. The base station may independently configure the TCI status type for each TRP and may indicate the configured TCI status type to the terminal. For example, the base station may configure the TCI status type of the first TRP as a joint TCI status type and may configure the TCI status type of the second TRP as an independent TCI status type. The terminal may identify the TCI status type configured by the base station for each TRP. In order to support the above operations, the base station may signal to the terminal information indicating the use (e.g., support) of a method for independently configuring the TCI status type for each TRP. In this case, the terminal may identify the TCI status type independently configured for each TRP based on the indication from the base station.

[0145] On the other hand, serving cells with similar physical characteristics and / or similar channels can be configured as a list (e.g., a simultaneous U-TCI-update list), and the TCI status of all serving cells included in the list can be updated (e.g., activated and / or deactivated) using a single TCI status activation / deactivation MAC CE. The above operation can be applied to the mTRP system.

[0146] In an mTRP system, the base station may independently indicate the TCI state type for each TRP through signaling (e.g., RRC signaling). For example, the base station may generate configuration information including the TCI state type and an identifier of the TRP to which the TCI state type is applied (e.g., TRP ID, CORESET ID, CORESET group ID), and may signal the configuration information to the terminal. The detailed method for the above operation may be as follows.

[0147] [Method #1]

[0148] Method #1 may be a method for reducing system complexity and / or signaling overhead. The TCI state type of the serving cell may be applied to the TRP associated with the serving cell (eg, the same PCI). Method #1 may correspond to Figure 11a In this case, the base station may not separately configure the TCI state type for each TRP to the terminal through signaling (e.g., RRC signaling). For example, when the base station indicates the TCI state type of the serving cell (e.g., a joint or independent TCI state type) to the terminal through signaling (e.g., RRC signaling), the TCI state type of the serving cell may be applied to all TRPs associated with the serving cell (e.g., the PCI of the serving cell). When the TCI state type of the serving cell is configured as a joint TCI state type, the same TCI state may be used in the DL channel and the UL channel of the corresponding TRP associated with the serving cell.

[0149] The TCI states configured for the corresponding TRPs may be independent. For example, the TCI state of the first TRP may be different from the TCI state of the second TRP, and the same TCI state may be used in the DL channel and UL channel of the first TRP, and the same TCI state may be used in the DL channel and UL channel of the second TRP, and the TCI state applied to the first TRP and the TCI state applied to the second TRP may be independent. When the TCI state type of the serving cell is configured as an independent TCI state type, the TCI state may be independently configured in the DL channel and UL channel of each TRP associated with the serving cell. The activation or deactivation of each TCI state for the DL channel and the UL channel may be indicated. Depending on whether the TCI state is transmittable for multiple TRPs, the structure of the TCI state activation / deactivation MAC CE (e.g., the structure of a unified TCI state activation / deactivation MAC CE) may vary. In the present invention, MAC CE may refer to a MAC CE for activation / deactivation of a TCI state (e.g., a unified TCI state).

[0150] [Method #1-1]

[0151] The base station can use a single MAC CE to activate / deactivate (e.g., activate and / or deactivate) the TCI state for the sTRP. The above operation can be applied when the activation / deactivation of the TCI state for the TRP does not need to be performed simultaneously. A single MAC CE can be used to configure (e.g., indicate) the activation / deactivation of the TCI state for one TRP.

[0152] Figure 12 is a conceptual diagram illustrating a second exemplary embodiment of the TCI state activation / deactivation MAC CE.

[0153] like Figure 12 As shown, the base station may generate a TCI state activation / deactivation MAC CE indicating activation or deactivation of a TCI state (e.g., a unified TCI state), and may send the TCI state activation / deactivation MAC CE to the terminal. For the above operation, the base station may pre-send a DCI scheduling PDSCH (TCI state activation / deactivation MAC CE is transmitted on the PDSCH) to the terminal. The TCI state activation / deactivation MAC CE may be a unified TCI state activation / deactivation MAC CE. The TCI state activation / deactivation MAC CE may include a CORESET pool ID field (or R bit), a serving cell ID field, a DL BWP ID field, an ULBWP ID field, a P i field, D / U field, TCI state ID field and / or R bit. In addition, the TCI state activation / deactivation MAC CE may further include a TRP indication field. In this case, some R bits in the TCI state activation / deactivation MAC CE may be configured as TRP indication fields. As another method, the serving cell ID field in the TCI state activation / deactivation MAC CE may be configured as a TRP indication field. In other words, the TCI state activation / deactivation MAC CE may include a TRP indication field instead of a serving cell ID field. The R bit may be set to 0.

[0154] Figure 12 The TCI state activation / deactivation MAC CE includes the CORESET pool ID field, serving cell ID field, DL BWP ID field, UL BWP ID field, P i The meaning of the field, D / U field and TCI status ID field can be compared with Figure 10 The TCI state activation / deactivation MAC CE includes the CORESET pool ID field, serving cell ID field, DL BWPID field, UL BWP ID field, P i The meanings of the field, D / U field, and TCI status ID field are the same or similar.

[0155] exist Figure 12 In an exemplary embodiment, some R bits included in the TCI state activation / deactivation MAC CE can be used to indicate a TRP. In other words, some R bits can be used to indicate a TRP associated with a TCI state to be activated or deactivated. The R bits used to indicate a TRP can be called a TRP indication field. The number of bits included in the TRP indication field can vary depending on the number of TRPs associated with one PCI. When a bit operation scheme (e.g., a bitmap scheme) is used, when M TRPs are associated with one PCI (e.g., when M TRPs are associated with one base station or one cell), the number of bits included in the TRP indication field can be M. M can be a natural number. The bit operation scheme can be called a bitmap scheme. The M bits included in the TRP indication field can be linked to the index of the corresponding TRP in descending or increasing order. The bits included in the TRP indication field can be mapped one-to-one with the TRP. When a logarithmic (log) scheme is used, the number of bits included in one TRP indication field can be log2M.

[0156] When the base station supports four TRPs (e.g., four TRPs are associated with a serving cell), and the base station indicates activation or deactivation of the TCI state for the third TRP, the TRP indication field may be set to "0010" in a bitwise scheme and may be set to "10" in a logarithmic scheme. When TRPs are distinguished by a CORESET ID, the CORESET ID may be associated with a bit index corresponding to (CORESET ID+1) within the TRP indication field. When the TRP indication field includes four bits, the first, second, third, and fourth bits within the TRP indication field may be associated with CORESET #0, #1, #2, and #3, respectively.

[0157] [Method #1-2]

[0158] The base station can use a single MAC CE to activate and / or deactivate the TCI state for mTRP. According to method #1-1, it may not be possible to simultaneously activate and / or deactivate the TCI state for mTRP using a single MAC CE. According to method #1-2, the TCI state for mTRP can be simultaneously activated and / or deactivated using a single MAC CE. In other words, method #1-2 can be used when it is necessary to activate and / or deactivate the TCI state for mTRP using a single MAC CE.

[0159] Method #1-2 can be categorized into method #1-2a and method #1-2b. In method #1-2a, the base station can use a single MAC CE to activate and / or deactivate the same TCI state for mTRP. In method #1-2b, the base station can use a single MAC CE to activate and / or deactivate different TCI states for mTRP.

[0160] In method #1-2a, a MAC CE (e.g., a TCI state activation / deactivation MAC CE) may include a TRP indication field indicating multiple TRPs, and the same TCI state of the multiple TRPs indicated by the TRP indication field may be activated or deactivated. For example, when four TRPs are associated with one serving cell (e.g., one base station), the size of the TRP indication field may be four bits. When the TRP indication field included in the MAC CE is set to "1010", activation or deactivation of the first TCI state ID and the third TCI state ID among the N TCI state IDs included in the MAC CE may be indicated simultaneously. Each of the N TCI state IDs included in the MAC CE may be common to multiple TRPs. In terms of the payload size of the MAC CE, the exemplary embodiment may be advantageous compared to the exemplary embodiment described below.

[0161] As another method, the TCI state for each of the multiple TRPs can be configured separately. A single MAC CE can include information about the TCI state for each of the multiple TRPs. In this case, the payload size of a single MAC CE may increase.

[0162] Figure 13a is a conceptual diagram illustrating a third exemplary embodiment of a TCI state activation / deactivation MAC CE, Figure 13b is a conceptual diagram illustrating a fourth exemplary embodiment of the TCI state activation / deactivation MAC CE.

[0163] like Figure 13a and Figure 13bAs shown, the base station may send a TCI state activation / deactivation MAC CE indicating activation or deactivation of the TCI state (e.g., a unified TCI state) to the terminal. For the above operation, the base station may pre-send a DCI for scheduling PDSCH (TCI state activation / deactivation MAC CE is transmitted on PDSCH) to the terminal. The TCI state activation / deactivation MAC CE may be a unified TCI state activation / deactivation MAC CE. The TCI state activation / deactivation MAC CE may include a CORESET pool ID field (or R bit), a serving cell ID field, a DL BWP ID field (e.g., DL BWP ID 1 field, DLBWP ID 2 field), a UL BWP ID field (e.g., UL BWP ID 1 field, UL BWP ID 2 field), a TRP indication field, a P i Field (for example, P 1i Field, P 2i field), D / U field, TCI state index (ID) field and / or R bit. As another method, the serving cell ID field in the TCI state activation / deactivation MAC CE can be configured as a TRP indication field. In other words, the TCI state activation / deactivation MAC CE can include a TRP indication field instead of a serving cell ID field. The R bit can be set to 0. 1i The P field may indicate whether each TCI code point for the first TRP corresponds to multiple TCI states or a single TCI state. 2i The field may indicate whether each TCI code point for the second TRP corresponds to multiple TCI states or a single TCI state.

[0164] Figure 13a and Figure 13b The TCI state activation / deactivation MAC CE includes the CORESET pool ID field, serving cell ID field, DL BWP ID field, UL BWP ID field, TRP indication field, P i The meaning of the field, D / U field and TCI status ID field can be compared with Figure 12 The TCI state activation / deactivation MAC CE includes the CORESET pool ID field, serving cell ID field, DL BWP ID field, UL BWP ID field, TRP indication field, P i The meanings of the field, D / U field, and TCI status ID field are the same or similar.

[0165] The number of TRPs associated with the serving cell indicated by the serving cell ID field included in the MAC CE (e.g., TCI state activation / deactivation MAC CE) may be M, and the number of TCI state IDs for each TRP within the MAC CE may be N. In this case, the number of TCI state ID fields included in the MAC CE may be M×N. Each of M and N may be a natural number.

[0166] When multiple TRPs indicated by MAC CE share the same DL / UL BWP, Figure 13a The MACCE shown in FIG. The DL BWP ID field included in the MAC CE may indicate the DL BWP for the first TRP and the second TRP, and the UL BWP ID field included in the MAC CE may indicate the UL BWP for the first TRP and the second TRP. When the multiple TRPs indicated by the MAC CE have different DL / UL BWPs, the Figure 13b . The DLBWP ID 1 field included in the MAC CE may indicate a DL BWP for a first TRP, and the UL BWP ID 1 field included in the MAC CE may indicate a UL BWP for a first TRP. The DL BWP ID 2 field included in the MAC CE may indicate a DL BWP for a second TRP, and the UL BWP ID 2 field included in the MAC CE may indicate a UL BWP for a second TRP. Figure 13b In an exemplary embodiment of , some R bits included in the MAC CE may be configured as a DL BWP ID 2 field and a ULBWP ID 2 field.

[0167] exist Figure 13a and Figure 13b In an exemplary embodiment of the present invention, activation or deactivation indication of TCI status for multiple TRPs can be performed at one time. Therefore, the logarithmic scheme proposed in method #1-1 may not be applicable to configuring the TRP indication field. Figure 13a and Figure 13b The number of TCI State ID fields included in the MAC CE shown may be M×N, and Figure 12 The number of TCI state ID fields included in the shown MAC CE may be N. Figure 13a and Figure 13b The number of TCI State ID fields included in the MAC CE shown may be greater than Figure 12The number of TCI state ID fields included in the illustrated MAC CE is (M-1) x N. M may be the number of TRPs associated with a serving cell indicated by a serving cell ID field included in the MAC CE.

[0168] On the other hand, in order to simultaneously activate and / or deactivate the TCI states for serving cells belonging to the same list, the base station may configure a simultaneous U-TCI-update list to the terminal through signaling (e.g., RRC signaling). Similar to the above method, in order to simultaneously activate and / or deactivate the TCI states for TRPs belonging to the same list, the base station may configure a simultaneous U-TCI-TRP-update list to the terminal through signaling (e.g., RRC signaling). Each of the simultaneous U-TCI-TRP-update lists may include one or more TRPs. The same TRP may not be included in different simultaneous U-TCI-TRP-update lists.

[0169] When method #1 is used, the same TCI state type (e.g., joint or independent TCI state type) can be applied to a TRP (e.g., a TRP associated with a serving cell) and a serving cell (e.g., a base station). Therefore, the base station can signal a simultaneous U-TCI-TRP-update list to the terminal through a hierarchical structure. The simultaneous U-TCI-TRP-update list may include a TRP identifier (e.g., a TRP ID). The terminal can receive the simultaneous U-TCI-TRP-update list from the base station. When the simultaneous U-TCI-TRP-update list is configured to the terminal and the TRP (e.g., a single TRP) indicated by the TCI state activation / deactivation MAC CE belongs to a specific simultaneous U-TCI-TRP-update list, the terminal can activate or deactivate the TCI state for all TRPs belonging to the specific simultaneous U-TCI-TRP-update list based on the indication of the TCI state activation / deactivation MAC CE. In other words, the terminal can activate or deactivate the TCI state for the TRP indicated by the TRP indication field included in the TCI state activation / deactivation MAC CE, can identify the remaining TRPs among all TRPs belonging to the specific U-TCI-TRP-update list to which the TRP belongs, and can activate or deactivate the TCI state for the remaining TRPs.

[0170] The base station may send a simultaneous U-TCI-TRP-update list for each PCell to the terminal via signaling (e.g., RRC signaling). The simultaneous U-TCI-TRP-update list may include not only a TRP identifier but also a PCI (e.g., an ID of a serving cell associated with the TRP). All TRPs included in the simultaneous U-TCI-TRP-update list may be associated with one PCI (e.g., one serving cell). The terminal may receive a simultaneous U-TCI-TRP-update list from the base station and may identify information (e.g., a TRP identifier and / or PCI) included in the simultaneous U-TCI-TRP-update list. When the simultaneous U-TCI-TRP-update list is configured, the terminal may simultaneously activate or deactivate the TRP for each cell (e.g., base station) based on the TCI status activation / deactivation MAC CE.

[0171] For example, the base station may configure a simultaneous U-TCI-update list 1 for the terminal, and the terminal may receive the simultaneous U-TCI-update list 1 from the base station. The simultaneous U-TCI-update list 1 configured for the terminal may be {PCI 3, PCI 4, PCI 5}. The base station may configure a simultaneous U-TCI-TRP-update list 1 for the terminal, and the terminal may receive the simultaneous U-TCI-TRP-update list 1 from the base station. The simultaneous U-TCI-TRP-update list 1 configured for the terminal may be {TRP 1, TRP 2} associated with PCI 3. In this case, the base station may generate a TCI state activation / deactivation MAC CE including a serving cell ID field indicating PCI 3 and a TRP indication field indicating TRP 1, and may send the TCI state activation / deactivation MAC CE to the terminal. The terminal may receive the TCI state activation / deactivation MAC CE from the base station and may identify information (e.g., fields, information elements) included in the TCI state activation / deactivation MAC CE.

[0172] When the serving cell ID field included in the TCI state activation / deactivation MAC CE indicates PCI 3, and PCI 3 (for example, a serving cell with PCI 3) belongs to the simultaneous U-TCI-update list 1 configured by the base station, the terminal can activate or deactivate all serving cells belonging to the simultaneous U-TCI-update list 1 (for example, a serving cell with PCI 3, a serving cell with PCI 4, and a serving cell with PCI 5). In addition, when the TRP indication field included in the TCI state activation / deactivation MAC CE indicates TRP 1, and TRP 1 belongs to the simultaneous U-TCI-TRP-update list 1 configured by the base station, the terminal can activate or deactivate all TRPs belonging to the simultaneous U-TCI-TRP-update list 1.

[0173] As another method, the base station may configure a simultaneous U-TCI-TRP-update list for each simultaneous U-TCI-update list and may indicate the simultaneous U-TCI-update list and the simultaneous U-TCI-TRP-update list to the terminal. The terminal may receive the simultaneous U-TCI-update list and the simultaneous U-TCI-TRP-update list from the base station. A simultaneous U-TCI-update list may be associated with one or more simultaneous U-TCI-TRP-update lists. In this case, the base station may send a TCI state activation / deactivation MAC CE to the terminal. The terminal may receive a TCI state activation / deactivation MAC CE from the base station. When the serving cell indicated by the serving cell ID field included in the TCI state activation / deactivation MAC CE belongs to the simultaneous U-TCI-update list configured by the base station, and the simultaneous U-TCI-TRP-update list associated with the simultaneous U-TCI-update list is configured by the base station, the terminal may activate or deactivate all serving cells belonging to the simultaneous U-TCI-update list and all TRPs belonging to the simultaneous U-TCI-TRP-update list associated with the simultaneous U-TCI-update list.

[0174] For example, the base station may configure a simultaneous U-TCI-update list 1 for the terminal, and the terminal may receive the simultaneous U-TCI-update list 1 from the base station. The simultaneous U-TCI-update list 1 configured for the terminal may be {PCI 3, PCI 4, PCI 5}. The base station may configure a simultaneous U-TCI-TRP-update list 1 associated with the simultaneous U-TCI-update list 1 for the terminal, and the terminal may receive the simultaneous U-TCI-TRP-update list 1 associated with the simultaneous U-TCI-update list 1 from the base station. The simultaneous U-TCI-TRP-update list 1 configured for the terminal may be {TRP 0, TRP 1}. In this case, the base station may generate a TCI state activation / deactivation MAC CE including a serving cell ID field indicating PCI 4, a TRP indication field indicating TRP 1, etc., and may send the TCI state activation / deactivation MAC CE to the terminal. The terminal may receive the TCI state activation / deactivation MAC CE from the base station and may identify the information (e.g., fields, information elements) included in the TCI state activation / deactivation MAC CE.

[0175] When the serving cell ID field included in the TCI state activation / deactivation MAC CE indicates PCI 4 and PCI 4 (e.g., a serving cell with PCI 4) belongs to the simultaneous U-TCI-update list 1 configured by the base station, the terminal can activate or deactivate all serving cells belonging to the simultaneous U-TCI-update list 1 (e.g., a serving cell with PCI 3, a serving cell with PCI 4, and a serving cell with PCI 5). In addition, when the TRP indication field included in the TCI state activation / deactivation MAC CE indicates TRP 1 and TRP 1 belongs to the simultaneous U-TCI-TRP-update list 1 associated with the simultaneous U-TCI-update list 1, the terminal can activate or deactivate all TRPs belonging to the simultaneous U-TCI-TRP-update list 1 (e.g., TRP 0 and TRP 1). In other words, the terminal can activate or deactivate TRP 0 and TRP 1 for each of the serving cells belonging to the simultaneous U-TCI-update list 1.

[0176] As another method, the TCI state activation / deactivation MAC CE may not include a TRP indication field. Alternatively, the TRP indication field included in the TCI state activation / deactivation MAC CE may not indicate a specific TRP. In this case, the base station may generate a TCI state activation / deactivation MAC CE including a serving cell ID field indicating PCI 4, etc., and may send the TCI state activation / deactivation MAC CE to the terminal. The terminal may receive the TCI state activation / deactivation MAC CE from the base station and may identify the information (e.g., field, information element) included in the TCI state activation / deactivation MAC CE.

[0177] When the serving cell ID field included in the TCI state activation / deactivation MAC CE indicates PCI 4 and PCI 4 (e.g., a serving cell with PCI 4) belongs to the simultaneous U-TCI-update list 1 configured by the base station, the terminal can activate or deactivate all serving cells belonging to the simultaneous U-TCI-update list 1 (e.g., a serving cell with PCI 3, a serving cell with PCI 4, and a serving cell with PCI 5). In addition, the terminal can activate or deactivate all TRPs (e.g., TRP 0 and TRP 1) belonging to the simultaneous U-TCI-TRP-update list 1 associated with the simultaneous U-TCI-update list 1. In other words, the terminal can activate or deactivate TRP 0 and TRP 1, respectively, corresponding to the serving cells belonging to the simultaneous U-PCI update list 1.

[0178] In the above exemplary embodiment, when the TCI state type is configured as the joint TCI state type, the UL BWP ID field may be configured as the R bit.

[0179] [Method #2]

[0180] TRPs may be geographically separated. In this case, the links between the corresponding TRPs associated with the same base station (e.g., the same cell) and the terminal may be independent. For example, the link between TRP 1 associated with base station 1 and the terminal may be independent of the link between TRP 2 associated with base station 1 and the terminal. In this case, channel reciprocity may not be satisfied. In method #1, the activation or deactivation of the TCI state of TRPs with the same TCI state type (e.g., joint or independent TCI state type) may be indicated. On the other hand, in method #2, the activation or deactivation of the TCI state of TRPs with different TCI state types may be indicated. The TCI state type of the TRP may be configured independently of the TCI state type of the serving cell associated with the TRP. For example, the base station may send information indicating the TCI state type of the serving cell to the terminal, and may send information indicating the TCI state type of the TRP to the terminal. The terminal may identify the TCI state type of the serving cell and / or the TCI state type of the TRP based on the information received from the base station.

[0181] The structure of the TCI state activation / deactivation MAC CE for method #2 may be the same as that of the TCI state activation / deactivation MAC CE for method #1 (e.g., Figure 12 、 Figure 13a and / or Figure 13b The structure of the TCI state activation / deactivation MAC CE) shown in Figure 1 is exactly the same. Since the TCI state activation / deactivation MAC CE has a common structure regardless of the TCI state type, the TCI state activation / deactivation MAC CE with the same structure can be applied to both method #1 and method #2.

[0182] In method #1, it can be assumed that the TRPs have the same TCI status type. Therefore, one or two code points can be assigned depending on the TCI status type. When the TCI status type is a joint TCI status type, one code point can be assigned. When the TCI status type is an independent TCI status type, two code points can be assigned.

[0183] In method #2, since TRPs have different TCI state types, one or two code points can be assigned to each TRP. A bit for indicating the TCI state type for each TRP can be added to the TCI state activation / deactivation MAC CE. For example, when M TRPs are associated with a serving cell and the TRP indication field is configured in a logarithmic scheme, the TRP indication field can include M bits + log2M bits. The log2M bits can be used to indicate a specific TRP. The M bits can be used to indicate the TCI state type of each TRP. The M bits can be associated with the M TRPs in increasing or decreasing order.

[0184] For example, when the number of TRPs associated with the serving cell is 4, the TRP indication field may include 4 bits + log24 bits. The terminal may identify the TCI state type of the TRP associated with a specific bit (e.g., a specific bit in the 4 bits) based on the value of the specific bit corresponding to the activated or deactivated TRP (e.g., 0 or 1). When the value of the specific bit in the M bits is set to 0, the terminal may determine the TCI state type of the TRP associated with the specific bit as a joint TCI state type. When the value of the specific bit in the M bits is set to 1, the terminal may determine the TCI state type of the TRP associated with the specific bit as an independent TCI state type. Alternatively, when the value of the specific bit in the M bits is set to 0, the terminal may determine the TCI state type of the TRP associated with the specific bit as an independent TCI state type. When the value of the specific bit in the M bits is set to 01, the terminal may determine the TCI state type of the TRP associated with the specific bit as a joint TCI state type.

[0185] In the above exemplary embodiment, the number of bits in the TCI State ID field may vary depending on the number of TCI state pools configured for DL ​​channels and / or UL channels. In the above exemplary embodiment, the number of bits in the TRP indication field included in the TCI State Activation / Deactivation MAC CE may vary depending on the number of TRPs associated with one serving cell (e.g., one PCI).

[0186] In the above exemplary embodiment, the simultaneous U-TCI-update list may include information indicating each serving cell (e.g., PCI). Alternatively, the simultaneous U-TCI-update list may include information indicating the serving cell with the lowest index among the serving cells and information indicating the serving cell with the highest index among the serving cells. In other words, the simultaneous U-TCI-update list may be configured as {PCI A, PCI B}. Each of A and B may be a natural number, and B may be greater than A. PCI A may be the PCI of the serving cell with the lowest index among the serving cells indicated by the simultaneous U-TCI-update list. PCI B may be the PCI of the serving cell with the highest index among the serving cells indicated by the simultaneous U-TCI-update list. When the simultaneous U-TCI-update list is configured as {PCI A, PCI B}, the terminal may determine that the serving cells with PCI A to PCI B belong to the simultaneous U-TCI-update list.

[0187] In the above exemplary embodiment, the simultaneous U-TCI-TRP-update list may include information indicating each TRP (e.g., TRP ID). The simultaneous U-TCI-TRP-update list may include information indicating the TRP with the lowest index among the TRPs and information indicating the TRP with the highest index among the TRPs. In other words, the simultaneous U-TCI-TRP-update list may be configured as {TRP A, TRP B}. Each of A and B may be a natural number, and B may be greater than A. TRP A may be the TRP ID of the TRP with the lowest index among the TRPs indicated by the simultaneous U-TCI-TRP-update list. TRP B may be the TRP ID of the TRP with the highest index among the TRPs indicated by the simultaneous U-TCI-TRP-update list. When the simultaneous U-TCI-TRP-update list is configured as {TRP A, TRP B}, the terminal may determine that the TRPs having TRP A to TRP B belong to the simultaneous U-TCI-TRP-update list.

[0188] In the above exemplary embodiment, TRPs may be geographically separated. Therefore, a TCI state pool may be configured for each TRP or TRP group. TRPs belonging to a TRP group may share the same TCI state pool.

[0189] When the TCI state type is a joint TCI state type, at most one TCI state can be mapped to one code point. When the TCI state type is an independent TCI state type, at most two TCI states can be mapped to one code point. In other words, when the TCI state type is an independent TCI state type, one TCI state for a DL channel can be mapped to one code point, and one TCI state for an UL channel can be mapped to one code point. The number of TCI states to be activated or deactivated can be one.

[0190] In an mTRP system, one code point can be configured to indicate the TCI states for multiple TRPs. For example, when the TCI state type is a joint TCI state type, code point 1 can be configured to indicate {joint TCI state 1 for the first TRP, joint TCI state 1 for the second TRP}, and code point 2 can be configured to indicate {joint TCI state 2 for the first TRP, joint TCI state 2 for the second TRP}, and so on. When the TCI state type is an independent TCI state type, code point 1 can be configured to indicate {DL TCI state 1 for the first TRP, UL TCI state 1 for the first TRP, DL TCI state 2 for the second TRP, UL TCI state 2 for the second TRP}, and so on.

[0191] In the above exemplary embodiment, the terminal may send information indicating whether simultaneous activation / deactivation of the TCI state for TRP is supported to the base station. The information indicating whether simultaneous activation / deactivation of the TCI state for TRP is supported may be included in the UE capability information sent by the terminal to the base station. The base station may determine whether the terminal supports simultaneous activation / deactivation of the TCI state for TRP based on the information received from the terminal.

[0192] The terminal may transmit information indicating whether to activate / deactivate the TCI state for all TRPs at once, or whether to activate / deactivate the TCI state for each TRP or BWP individually (e.g., independently) to the base station. The base station may identify the operations supported by the terminal (e.g., simultaneous activation / deactivation of TCI states or independent activation / deactivation of TCI states) based on the information received from the terminal.

[0193] When the TCI status of a serving cell included in a list of cells subject to activation / deactivation (e.g., a simultaneous U-TCI-update list) is updated (e.g., activated or deactivated), not only the serving cell subject to activation / deactivation but all TRPs associated with the serving cell may be simultaneously activated or deactivated to achieve gains in signaling overhead. In order to flexibly use the TRP or TCI status, bits (e.g., fields) indicating the updated TRPs may be configured in the MAC CE and / or DCI. The bits may be configured in descending or ascending order of the indices of all TRPs associated with the same PCI or the indices of the TRPs actually used. The bits may be configured in a bitwise operation form. Each of the bits may be indicated (e.g., configured) in an on / off form.

[0194] The operation of the method according to the exemplary embodiment of the present invention can be implemented as a computer-readable program or code in a computer-readable recording medium. The computer-readable recording medium may include all types of recording devices storing data that can be read by a computer system. In addition, the computer-readable recording medium can store and execute programs or codes, which can be distributed among computer systems connected via a network and read by computers in a distributed manner.

[0195] Computer readable recording media may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, or flash memory. Program instructions may 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.

[0196] Although some aspects of the present invention have been described in the context of an apparatus, these aspects can be indicated according to the corresponding description of the method, and a block or apparatus can correspond to the steps of the method or the features of the steps. Similarly, the aspects described in the context of the method can be represented as the features of the corresponding blocks or items or corresponding apparatus. Some or all steps of the method can be performed by (or using) a hardware device such as a microprocessor, a programmable computer or an electronic circuit. In some embodiments, one or more of the most important steps of the method can be performed by such an apparatus.

[0197] 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, the field programmable gate array can be operated with a microprocessor to perform one of the methods described herein. Typically, the methods are preferably performed by specific hardware devices.

[0198] The description of the present invention is merely exemplary in nature, and therefore variations that do not depart from the essence of the present invention are intended to be within the scope of the present invention. Such variations should not be considered to depart from the spirit and scope of the present invention. Therefore, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope defined by the appended claims.

Claims

1. A method of a user equipment (UE), comprising: receiving a transmission configuration indicator (TCI) state activation / deactivation medium access control (MAC) control element (CE) from a base station, the TCI state activation / deactivation MAC CE indicating activation or deactivation of a TCI state; Identify one or more transmission and reception points (TRPs) indicated by the TRP indication field included in the TCI state activation / deactivation MAC CE; identifying one or more TCI state indexes (IDs) associated with one or more TRPs based on a TCI state ID field included in a TCI state activation / deactivation MAC CE; and Activate or deactivate one or more TCI states having one or more TCI state IDs.

2. The method according to claim 1, wherein The TCI state activation / deactivation MAC CE further includes a serving cell identifier (ID) field, and one or more TRPs are associated with a serving cell indicated by the serving cell ID.

3. The method according to claim 2, wherein: The size of the TRP indication field varies according to the number of one or more TRPs associated with the serving cell, and when the number of one or more TRPs is M, the size of the TRP indication field is M bits or log2M bits, where M is a natural number.

4. The method according to claim 2, further comprising: receiving information indicating the TCI status type of the serving cell from the base station, The TCI state type indication is a joint TCI state type or an independent TCI state type, and the TCI state type of the serving cell is applied to one or more TRPs associated with the serving cell.

5. The method according to claim 2, further comprising: receiving, from a base station, information indicating a TCI status type of a serving cell; as well as Receive information indicating TCI status types of multiple TRPs from the base station, Among them, the TCI status types of multiple TRPs are configured independently of the TCI status type of the serving cell, and one or more TRPs belong to the multiple TRPs.

6. The method according to claim 1, further comprising: receiving one or more simultaneous unified (U)-TCI-TRP-update lists from a base station, Therein, activation or deactivation of the TCI status of each TRP belonging to one or more simultaneous U-TCI-TRP-update lists is performed simultaneously.

7. The method according to claim 6, further comprising: In response to the one or more simultaneous U-TCI-TRP-update lists being configured by the base station, identifying in the one or more simultaneous U-TCI-TRP-update lists the simultaneous U-TCI-TRP-update lists to which the one or more TRPs belong; Identifying all TRPs belonging to the identified simultaneous U-TCI-TRP-update list; and For all remaining TRPs excluding one or more TRPs among all identified TRPs, the TCI state is activated or deactivated.

8. The method according to claim 1, wherein When one or more TRPs include a first TRP and a second TRP, the TCI state activation / deactivation MAC CE includes: a downlink (DL) bandwidth part (BWP) 1 field indicating a first DL BWP for the first TRP, an uplink (UL) BWP 1 field indicating a first UL BWP for the first TRP, a DL BWP 2 field indicating a second DL BWP for the second TRP, and a UL BWP 2 field indicating a second UL BWP for the second TRP.

9. The method according to claim 1, wherein When the one or more TRPs include a first TRP and a second TRP, the TCI state activation / deactivation MAC CE includes a DL BWP field indicating a DL BWP for the first TRP and the second TRP, and a UL BWP field indicating a UL BWP for the first TRP and the second TRP.

10. A method for a base station, comprising: generating a transmission configuration indicator (TCI) state activation / deactivation medium access control (MAC) control element (CE), the transmission configuration indicator (TCI) state activation / deactivation medium access control (MAC) control element (CE) including a TRP indication field indicating one or more transmission and reception points (TRPs) and one or more TCI state index (ID) fields associated with the one or more TRPs; as well as Send TCI status activation / deactivation MAC CE to the user equipment (UE), The TCI state activation / deactivation MAC CE indicates activation or deactivation of one or more TCI states associated with one or more TRPs.

11. The method according to claim 10, wherein: The TCI state activation / deactivation MAC CE further includes a serving cell identifier (ID) field, and one or more TRPs are associated with a serving cell indicated by the serving cell ID.

12. The method according to claim 11, wherein The size of the TRP indication field varies according to the number of one or more TRPs associated with the serving cell, and when the number of one or more TRPs is M, the size of the TRP indication field is M bits or log2M bits, where M is a natural number.

13. The method according to claim 11, further comprising: Send information indicating the TCI status type of the serving cell to the UE, The TCI state type indication is a joint TCI state type or an independent TCI state type, and the TCI state type of the serving cell is applied to one or more TRPs associated with the serving cell.

14. The method according to claim 11, further comprising: Sending information indicating the TCI status type of the serving cell to the UE; as well as Send information indicating the TCI status type of multiple TRPs to the UE, Among them, the TCI status types of multiple TRPs are configured independently of the TCI status type of the serving cell, and one or more TRPs belong to the multiple TRPs.

15. The method according to claim 10, further comprising: Send one or more simultaneous unified (U)-TCI-TRP-Update lists to the UE, Therein, activation or deactivation of the TCI status of each TRP belonging to one or more simultaneous U-TCI-TRP-update lists is performed simultaneously.

16. The method according to claim 10, wherein When one or more TRPs include a first TRP and a second TRP, the TCI state activation / deactivation MAC CE includes: a downlink (DL) bandwidth part (BWP) 1 field indicating a first DL BWP for the first TRP, an uplink (UL) BWP 1 field indicating a first UL BWP for the first TRP, a DL BWP 2 field indicating a second DL BWP for the second TRP, and a UL BWP 2 field indicating a second UL BWP for the second TRP.

17. The method according to claim 10, wherein When the one or more TRPs include a first TRP and a second TRP, the TCI state activation / deactivation MAC CE includes a DL BWP field indicating a DL BWP for the first TRP and the second TRP, and a UL BWP field indicating a UL BWP for the first TRP and the second TRP.

18. A user equipment (UE), comprising at least one processor, wherein the at least one processor causes the UE to perform: receiving a transmission configuration indicator (TCI) state activation / deactivation medium access control (MAC) control element (CE) from a base station, the TCI state activation / deactivation MAC CE indicating activation or deactivation of a TCI state; Identify one or more transmission and reception points indicated by the TRP indication field included in the TCI state activation / deactivation MAC CE; identifying one or more TCI state indexes (IDs) associated with one or more TRPs based on a TCI state ID field included in a TCI state activation / deactivation MAC CE; and Activate or deactivate one or more TCI states having one or more TCI state IDs.

19. The UE according to claim 18, wherein: The at least one processor further causes the UE to perform: receiving information indicating a TCI status type of a serving cell from a base station, The TCI state type is indicated as a joint TCI state type or an independent TCI state type, the TCI state type of the serving cell is applied to one or more TRPs associated with the serving cell, and the serving cell is indicated by a serving cell identifier (ID) field included in the TCI state activation / deactivation MAC CE.

20. The UE according to claim 18, wherein The at least one processor further causes the UE to perform: receiving one or more simultaneous unified (U)-TCI-TRP-update lists from the base station, Therein, activation or deactivation of the TCI status of each TRP belonging to one or more simultaneous U-TCI-TRP-update lists is performed simultaneously.

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