KR20230147526A - Method and apparatus for supporting beam switching - Google Patents

Abstract

A method and apparatus for supporting beam switching are disclosed. The method of the terminal includes receiving first integrated TCI information including a first TCI and a second TCI from a base station, first scheduling information of a first PDSCH, the first TCI belonging to the first integrated TCI information, and the Receiving a first DCI including information indicating at least one TCI among second TCIs from the base station, and first receiving the first PDSCH based on the at least one TCI and the first scheduling information Includes steps for performing an action.

Description

Supporting method and apparatus for beam switching {METHOD AND APPARATUS FOR SUPPORTING BEAM SWITCHING}

This disclosure relates to technology for transmitting and receiving signals in a communication system, and more specifically, to technology for supporting high-speed beam switching of a terminal in high-frequency band communication.

The importance of wireless communication infrastructure in future industries is increasing day by day, and accordingly, next-generation communication systems that provide more advanced performance (for example, new radio (NR) communication systems, 6G communication systems, etc.) are attracting attention. The next-generation communication system must support not only conventional mobile communication frequency bands, but also millimeter wave bands above 6 GHz and terahertz bands, and must support more diverse communication scenarios than conventional communication systems (for example, LTE communication systems).

For example, the NR communication system aims for an integrated standard that supports all usage scenarios such as eMBB (enhanced Mobile BroadBand), URLLC (Ultra Reliable Low Latency Communication), and mMTC (massive Machine Type Communication), and is also used in various industries. New concepts of services and requirements are continuously being demanded. In addition, in next-generation communication systems, overcoming inferior channel characteristics such as millimeter wave band and terahertz band and increasing communication efficiency is an important issue, and various technologies for this purpose need to be improved.

The purpose of the present disclosure to solve the above problems is to provide a method and device for quickly indicating beam switching in high frequency band communication.

A method of a terminal according to the first embodiment of the present disclosure to achieve the above object includes receiving first integrated TCI information including a first TCI and a second TCI from a base station, first scheduling information of the first PDSCH and receiving, from the base station, a first DCI including information indicating at least one TCI of the first TCI and the second TCI belonging to the first integrated TCI information, and the at least one TCI and the second TCI. 1. It includes performing a first reception operation for the first PDSCH based on scheduling information.

The first DCI may further include second integrated TCI information including a third TCI and a fourth TCI.

The at least one TCI and the second integrated TCI information may be indicated by one field or different fields in the first DCI, and the first DCI indicates the application time of the second integrated TCI information. Additional information may be included.

The method of the terminal is to send a second DCI including information indicating one or more TCIs of the third TCI and the fourth TCI belonging to the second scheduling information of the second PDSCH and the second integrated TCI information from the base station. It may further include receiving, and performing a second reception operation for the second PDSCH based on the one or more TCIs and the second scheduling information.

The first PDSCH may be scheduled within a first section to which the first integrated TCI information is applied, and the second PDSCH may be scheduled within a second section to which the second integrated TCI information is applied.

The method of the terminal may further include receiving information from the base station indicating performing a reception operation for DL data based on a single TCI, wherein the first reception operation includes the first TCI and the It may be performed based on one TCI of the second TCI.

If the terminal is not configured to perform a reception operation for DL data based on multiple TCIs, the first reception operation may be performed based on one of the first TCI and the second TCI.

A method of a terminal according to a second embodiment of the present disclosure for achieving the above object includes receiving first integrated TCI information including a first TCI and a second TCI from a base station, first scheduling information of the first PDSCH receiving a first DCI from the base station, selecting one of the first TCI and the second TCI based on a predefined rule, and the one belonging to the first integrated TCI information and performing a first reception operation for the first PDSCH based on the TCI and the first scheduling information.

The predefined rule may be to select a first TCI, a TCI with the lowest index, or a TCI with the highest index among the first TCI and the second TCI belonging to the first integrated TCI information.

The predefined rule may be to select a default TCI among the first TCI and the second TCI belonging to the first integrated TCI information when the scheduling offset between the first DCI and the first PDSCH is less than or equal to a reference value.

“When information instructing to perform a reception operation for DL data based on a single TCI is received from the base station” or “Performing the reception operation for the DL data based on multiple TCIs is configured in the terminal If not, the first reception operation may be performed based on the one TCI of the first TCI and the second TCI.

The first DCI may further include second integrated TCI information including a third TCI and a fourth TCI.

The method of the terminal includes receiving a second DCI including second scheduling information of a second PDSCH from the base station, the third TCI belonging to the second integrated TCI information indicated by the first DCI, and the selecting one TCI among fourth TCIs, and performing a second reception operation for the second PDSCH based on the one TCI belonging to the second integrated TCI information and the second scheduling information. It can be included.

The method of the base station according to the third embodiment of the present disclosure for achieving the above object includes transmitting first integrated TCI information including a first TCI and a second TCI to the terminal, first scheduling information of the first PDSCH And transmitting to the terminal a first DCI including information indicating at least one TCI of the first TCI and the second TCI belonging to the first integrated TCI information, and the at least one TCI and the second TCI. 1. Transmitting the first PDSCH to the terminal based on scheduling information.

The first DCI may further include second integrated TCI information including a third TCI and a fourth TCI.

The at least one TCI and the second integrated TCI information may be indicated by one field or different fields in the first DCI, and the first DCI indicates the application time of the second integrated TCI information. Additional information may be included.

The method of the base station is to send a second DCI including information indicating one or more TCIs of the third TCI and the fourth TCI belonging to the second scheduling information of the second PDSCH and the second integrated TCI information to the terminal. It may further include transmitting, and transmitting the second PDSCH to the terminal based on the one or more TCIs and the second scheduling information.

The first PDSCH may be scheduled within a first section to which the first integrated TCI information is applied, and the second PDSCH may be scheduled within a second section to which the second integrated TCI information is applied.

The method of the base station may further include transmitting information indicating performing a reception operation for DL data based on a single TCI to the terminal, and the first PDSCH includes the first TCI and the first PDSCH. It may be transmitted based on one TCI among two TCIs.

If the terminal is not configured to perform a reception operation for DL data based on multiple TCIs, the first PDSCH may be transmitted based on one of the first TCI and the second TCI.

According to the present disclosure, the base station can inform the terminal of a plurality of integrated TCIs (transmission configuration indicators), and can inform the terminal of at least one integrated TCI applied to a physical downlink shared channel (PDSCH) among the plurality of integrated TCIs. . In this case, the terminal can receive the PDSCH based on at least one integrated TCI indicated by the base station. Alternatively, the terminal may select an integrated TCI based on a predefined rule and receive the PDSCH based on the selected integrated TCI. According to the above-described integrated TCI indication method and/or selection method, the beam switching operation in the terminal can be performed quickly and the performance of the communication system can be improved.

1 is a conceptual diagram showing a first embodiment of a communication system.
Figure 2 is a block diagram showing a first embodiment of the device.
Figure 3 is a conceptual diagram showing a first embodiment of a TCI indication method by DCI.
Figure 4 is a conceptual diagram illustrating a first embodiment of a method of applying integrated TCI to a plurality of signals.
Figure 5 is a conceptual diagram illustrating a second embodiment of a method of applying integrated TCI to a plurality of signals.
Figure 6 is a conceptual diagram illustrating a first embodiment of an integrated TCI indication method for multiple TRP transmission.
Figure 7 is a conceptual diagram illustrating a second embodiment of an integrated TCI indication method for multiple TRP transmission.
Figure 8 is a conceptual diagram showing a third embodiment of an integrated TCI indication method for multiple TRP transmission.
FIG. 9 is a conceptual diagram illustrating a first embodiment of a method for determining a TCI to be applied to a scheduled PDSCH.
FIG. 10 is a conceptual diagram illustrating a second embodiment of a method for determining a TCI to be applied to a scheduled PDSCH.
FIG. 11 is a conceptual diagram illustrating a third embodiment of a method for determining a TCI to be applied to a scheduled PDSCH.
Figure 12 is a conceptual diagram showing a first embodiment of a method of applying TCI to CORESET in a multi-integrated TCI section.
Figure 13 is a conceptual diagram showing a first embodiment of a PDCCH monitoring method using a plurality of TCIs in the CORESET pool.

Since the present disclosure can make various changes and have various embodiments, specific embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present disclosure to specific embodiments, and should be understood to include all changes, equivalents, and substitutes included in the spirit and technical scope of the present disclosure.

Terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, a first component may be referred to as a second component, and similarly, the second component may be referred to as a first component without departing from the scope of the present disclosure. The term “and/or” includes any of a plurality of related stated items or a combination of a plurality of related stated items.

In embodiments of the present disclosure, “at least one of A and B” may mean “at least one of A or B” or “at least one of combinations of one or more of A and B.” Additionally, in embodiments of the present disclosure, “one or more of A and B” may mean “one or more of A or B” or “one or more of combinations of one or more of A and B.”

When a component is said to be "connected" or "connected" to another component, it is understood that it may be directly connected to or connected to the other component, but that other components may exist in between. It should be. On the other hand, when it is mentioned that a component is “directly connected” or “directly connected” to another component, it should be understood that there are no other components in between.

The terms used in this disclosure are only used to describe specific embodiments and are not intended to limit the disclosure. Singular expressions include plural expressions unless the context clearly dictates otherwise. In the present disclosure, terms such as “comprise” or “have” are intended to designate the presence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, but are not intended to indicate the presence of one or more other features. It should be understood that this does not exclude in advance the possibility of the existence or addition of elements, numbers, steps, operations, components, parts, or combinations thereof.

Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the technical field to which this disclosure pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related technology, and unless clearly defined in the present disclosure, should not be interpreted in an idealized or excessively formal sense. No.

Hereinafter, preferred embodiments of the present disclosure will be described in more detail with reference to the attached drawings. In order to facilitate overall understanding in explaining the present disclosure, the same reference numerals are used for the same components in the drawings, and duplicate descriptions of the same components are omitted.

A communication system to which embodiments according to the present disclosure are applied will be described. The communication system may be a 4G communication system (e.g., long-term evolution (LTE) communication system, LTE-A communication system), a 5G communication system (e.g., new radio (NR) communication system), a 6G communication system, etc. there is. The 4G communication system can support communication in frequency bands below 6GHz, and the 5G communication system can support communication in frequency bands above 6GHz as well as frequency bands below 6GHz. Communication systems to which embodiments according to the present disclosure are applied are not limited to those described below, and embodiments according to the present disclosure can be applied to various communication systems. Here, communication system may be used in the same sense as communication network, “LTE” may indicate “4G communication system”, “LTE communication system” or “LTE-A communication system”, and “NR” may refer to may indicate “5G communication system” or “NR communication system”.

In an embodiment, “setting an operation (e.g., a transmission operation)” means “setting information (e.g., information element, parameter) for the operation” and/or “performing the operation.” This may mean that “indicating information” is signaled. “An information element (eg, parameter) is set” may mean that the information element is signaled. Signaling includes system information (SI) signaling (e.g., transmission of system information block (SIB) and/or master information block (MIB)), RRC signaling (e.g., transmission of RRC parameters and/or upper layer parameters) , MAC control element (CE) signaling, or PHY signaling (e.g., transmission of downlink control information (DCI), uplink control information (UCI), and/or sidelink control information (SCI)).

1 is a conceptual diagram showing a first embodiment of a communication system.

Referring to FIG. 1, the communication system 100 includes a plurality of communication nodes 110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6). In addition, the communication system 100 includes a core network (e.g., serving-gateway (S-GW), packet data network (PDN)-gateway (P-GW), mobility management entity (MME)). More may be included. If the communication system 100 is a 5G communication system (e.g., a new radio (NR) system), the core network includes an access and mobility management function (AMF), a user plane function (UPF), a session management function (SMF), etc. may include.

A plurality of communication nodes 110 to 130 may support communication protocols (eg, LTE communication protocol, LTE-A communication protocol, NR communication protocol, etc.) specified in the 3rd generation partnership project (3GPP) standard. The plurality of communication nodes 110 to 130 may use code division multiple access (CDMA) technology, wideband CDMA (WCDMA) technology, time division multiple access (TDMA) technology, frequency division multiple access (FDMA) technology, orthogonal frequency division (OFDM) technology. multiplexing) technology, Filtered OFDM technology, CP (cyclic prefix)-OFDM technology, DFT-s-OFDM (discrete Fourier transform-spread-OFDM) technology, OFDMA (orthogonal frequency division multiple access) technology, SC (single carrier)-FDMA technology, NOMA (Non-orthogonal Multiple Access) technology, GFDM (generalized frequency division multiplexing) technology, FBMC (filter bank multi-carrier) technology, UFMC (universal filtered multi-carrier) technology, SDMA (Space Division Multiple Access) technology, etc. can support. Each of the plurality of communication nodes may mean an apparatus or a device. Embodiments may be performed by an apparatus or device. The structure of the device (eg, device) may be as follows.

Figure 2 is a block diagram showing a first embodiment of the device.

Referring to FIG. 2, the device 200 may include at least one processor 210, a memory 220, and a transmitting and receiving device 230 that is connected to a network and performs communication. Additionally, the device 200 may further include an input interface device 240, an output interface device 250, a storage device 260, etc. Each component included in the device 200 is connected by a bus 270 and can communicate with each other.

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

Referring again to FIG. 1, the communication system 100 includes a plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) and a plurality of terminals (130- 1, 130-2, 130-3, 130-4, 130-5, 130-6). Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may form a macro cell. Each of the fourth base station 120-1 and the fifth base station 120-2 may form a small cell. The fourth base station 120-1, the third terminal 130-3, and the fourth terminal 130-4 may belong to the cell coverage of the first base station 110-1. The second terminal 130-2, the fourth terminal 130-4, and the fifth terminal 130-5 may belong to the cell coverage of the second base station 110-2. The fifth base station 120-2, the fourth terminal 130-4, the fifth terminal 130-5, and the sixth terminal 130-6 may belong to the cell coverage of the third base station 110-3. there is. The first terminal 130-1 may belong to the cell coverage of the fourth base station 120-1. The sixth terminal 130-6 may belong to the cell coverage of the fifth base station 120-2.

Here, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 is NB (NodeB), eNB (evolved NodeB), gNB, ABS (advanced base station), and HR. -High reliability-base station (BS), base transceiver station (BTS), radio base station, radio transceiver, access point, access node, radio access station (RAS) ), MMR-BS (mobile multihop relay-base station), RS (relay station), ARS (advanced relay station), HR-RS (high reliability-relay station), HNB (home NodeB), HeNB (home eNodeB), It may be referred to as a road side unit (RSU), radio remote head (RRH), transmission point (TP), transmission and reception point (TRP), etc.

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

Meanwhile, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may operate in different frequency bands or may operate in the same frequency band. Each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 may be connected to each other through an ideal backhaul link or a non-ideal backhaul link. , information can be exchanged with each other through an ideal backhaul link or a non-ideal backhaul link. 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 through an ideal backhaul link or a non-ideal backhaul link. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) transmits the signal received from the core network to the corresponding terminal (130-1, 130-2, 130-3, 130). -4, 130-5, 130-6), and the signal received from the corresponding terminal (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) is sent to the core network. can be transmitted to.

In addition, each of the plurality of base stations 110-1, 110-2, 110-3, 120-1, and 120-2 performs MIMO transmission (e.g., single user (SU)-MIMO, multi user (MU)- MIMO, massive MIMO, etc.), coordinated multipoint (CoMP) transmission, carrier aggregation (CA) transmission, transmission in an unlicensed band, device to device communication (D2D) (or , ProSe (proximity services), IoT (Internet of Things) communication, dual connectivity (DC), etc. Here, each of the plurality of terminals 130-1, 130-2, 130-3, 130-4, 130-5, and 130-6 is connected to a base station 110-1, 110-2, 110-3, and 120-1. , 120-2) and operations corresponding to those supported by the base stations 110-1, 110-2, 110-3, 120-1, and 120-2. For example, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 based on the SU-MIMO method, and the fourth terminal 130-4 may transmit a signal to the fourth terminal 130-4 based on the SU-MIMO method. A signal can be received from the second base station 110-2. Alternatively, the second base station 110-2 may transmit a signal to the fourth terminal 130-4 and the fifth terminal 130-5 based on the MU-MIMO method, and the fourth terminal 130-4 and the fifth terminal 130-5 can each receive a signal from the second base station 110-2 by the MU-MIMO method.

Each of the first base station 110-1, the second base station 110-2, and the third base station 110-3 may transmit a signal to the fourth terminal 130-4 based on the CoMP method, and the fourth terminal 130-4 may transmit a signal to the fourth terminal 130-4. The 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 using the CoMP method. Each of a plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) has a terminal (130-1, 130-2, 130-3, 130-4) within its cell coverage. , 130-5, 130-6), and signals can be transmitted and received based on the CA method. The first base station 110-1, the second base station 110-2, and the third base station 110-3 each control D2D between the fourth terminal 130-4 and the fifth terminal 130-5. and each of the fourth terminal 130-4 and the fifth terminal 130-5 can perform D2D under the control of each of the second base station 110-2 and the third base station 110-3. .

This disclosure may relate to technology for transmitting and receiving signals in a communication system. A method and device for performing signal transmission and beam management based on multiple transmission points in a wireless communication system will be described. Embodiments in this disclosure can be applied to NR communication systems. Additionally, embodiments in the present disclosure may be applied to other communication systems (e.g., LTE communication system, 5G (fifth generation) communication system, 6G (sixth generation) communication system, etc.) in addition to the NR communication system.

In a communication system (eg, NR communication system), numerology applied to physical signals and channels may vary. Numerology can be varied to meet various technical requirements of communication systems. In a communication system where CP (cyclic prefix)-based OFDM waveform technology is applied, the numerology may include subcarrier spacing and CP length (or CP type). Table 1 may be a first embodiment of a numerology configuration method for a CP-OFDM based communication system. Adjacent subcarrier intervals may have an exponential relationship of 2, and the CP length may be scaled at the same rate as the OFDM symbol length. Depending on the frequency band in which the communication system operates, at least some of the numerologies in Table 1 may be supported. Additionally, numerology(s) not listed in Table 1 may be additionally supported in the communication system. CP type(s) not listed in Table 1 (e.g., extended CP) may be additionally supported for specific subcarrier spacing (e.g., 60 kHz).

Below, the frame structure of the communication system will be explained. Elements constituting the frame structure in the time domain may include subframes, slots, mini slots, symbols, etc. A subframe may be used as a unit of transmission, measurement, etc., and the length of the subframe may have a fixed value (for example, 1 ms) regardless of the subcarrier spacing. A slot may include consecutive symbols (eg, 14 OFDM symbols). The length of the slot may be variable, different from the length of the subframe. For example, the length of a slot may be inversely proportional to the subcarrier spacing.

A slot may be used as a unit for transmission, measurement, scheduling, resource configuration, timing (e.g., scheduling timing, hybrid automatic repeat request (HARQ) timing, channel state information (CSI) measurement and reporting timing, etc.). The actual length of time resources used for transmission, measurement, scheduling, resource setting, etc. may or may not match the slot length. A mini slot may include consecutive symbol(s), and the length of the mini slot may be shorter than the length of the slot. Mini slots can be used as a unit for transmission, measurement, scheduling, resource configuration, timing, etc. Mini-slots (eg, mini-slot length, mini-slot boundaries, etc.) may be predefined in technical specifications. Alternatively, the mini slot (eg, mini slot length, mini slot boundary, etc.) may be set (or instructed) in the terminal. When specific conditions are met, the use of the mini slot may be set (or instructed) in the terminal.

The base station may schedule a data channel (e.g., physical downlink shared channel (PDSCH), physical uplink shared channel (PUSCH), and physical sidelink shared channel (PSSCH)) using some or all of the symbols that make up the slot. . In particular, the data channel uses a portion of the slot for URLLC (Ultra Reliable Low Latency Communication) transmission, unlicensed band transmission, transmission in the coexistence situation of NR communication system and LTE communication system, and multi-user scheduling based on analog beamforming. can be transmitted. Additionally, the base station can schedule the data channel using a plurality of slots. Additionally, the base station may schedule the data channel using at least one mini slot.

Elements constituting the frame structure in the frequency domain may include resource blocks (RB), subcarriers, etc. One RB may include consecutive subcarriers (eg, 12 subcarriers). The number of subcarriers constituting one RB may be constant regardless of the numerology. In this case, the bandwidth occupied by one RB may be proportional to the subcarrier spacing of the numerology. RB can be used as a transmission and resource allocation unit for data channels, control channels, etc. Resource allocation of data channels may be performed on an RB or RB group (eg, resource block group (RBG)) basis. One RBG may include one or more consecutive RBs. Resource allocation of the control channel may be performed on a CCE (control channel element) basis. In the frequency domain, one CCE may include one or more RBs.

In an NR communication system, a slot (e.g., slot format) is one or more of a downlink (DL) section, a flexible section (or an unknown section), and an uplink (UL) section. It may be composed of a combination of sections. Each of the downlink section, flexible section, and uplink section may be composed of one or more consecutive symbols. The flexible section may be located between the downlink section and the uplink section, between the first downlink section and the second downlink section, between the first uplink section and the second uplink section, etc. When a flexible section is inserted between the downlink section and the uplink section, the flexible section can be used as a protection section.

A slot may include one or more flexible sections. Alternatively, the slot may not include a flexible section. The terminal can perform predefined operations in the flexible section. Alternatively, the terminal may perform operations set semi-statically or periodically by the base station in the flexible section. For example, operations periodically set by the base station include PDCCH (physical downlink control channel) monitoring operations, SS/PBCH (synchronization signal/physical broadcast channel) block reception and measurement operations, and CSI-RS (channel state information-reference signal) Reception and measurement operation, downlink SPS (semi-persistent scheduling) PDSCH reception operation, SRS (sounding reference signal) transmission operation, PRACH (physical random access channel) transmission operation, periodically configured PUCCH transmission operation, configured grant ) may include a PUSCH transmission operation according to ). Flexible symbols can be overridden by downlink symbols or uplink symbols. When a flexible symbol is overridden by a downlink or uplink symbol, the terminal can perform a new operation instead of the existing operation in the corresponding flexible symbol (e.g., an overridden flexible symbol).

The slot format may be set semi-fixably by higher layer signaling (eg, radio resource control (RRC) signaling). Information indicating the semi-fixed slot format may be included in system information, and the semi-fixed slot format may be set cell-specific. Additionally, the semi-fixed slot format can be additionally set for each terminal through terminal-specific higher layer signaling (e.g., RRC signaling). Flexible symbols in cell-specific slot formats can be overridden with downlink symbols or uplink symbols by UE-specific higher layer signaling. Additionally, the slot format may be dynamically indicated by physical layer signaling (e.g., slot format indicator (SFI) included in downlink control information (DCI)). A semi-fixably set slot format may be overridden by a dynamically indicated slot format. For example, a semi-fixably configured flexible symbol may be overridden by SFI as a downlink symbol or uplink symbol.

The base station and/or terminal may perform downlink operations, uplink operations, sidelink operations, etc. in the bandwidth part. The bandwidth portion may be defined as a set of consecutive RBs (eg, physical resource blocks (PRBs)) in the frequency domain with a specific numerology. RBs constituting one bandwidth portion may be continuous in the frequency domain. One numerology may be used for signal transmission (e.g., transmission of a control channel or data channel) in one portion of the bandwidth. In embodiments, “signal” when used in a broad sense may refer to any physical signal and channel. The terminal performing the initial access procedure can obtain configuration information for the initial bandwidth portion from the base station through system information. A terminal operating in the RRC connected state can obtain bandwidth configuration information from the base station through terminal-specific upper layer signaling.

Setting information of the bandwidth portion may include numerology (eg, subcarrier spacing and/or CP length) applied to the bandwidth portion. In addition, the setting information of the bandwidth portion further includes information indicating the location of the start RB (e.g., start PRB) of the bandwidth portion and information indicating the number of RBs (e.g., PRB) constituting the bandwidth portion. can do. Among the bandwidth portion(s) set in the terminal, at least one bandwidth portion may be activated. For example, within one carrier, one uplink bandwidth portion and one downlink bandwidth portion may each be activated. In a communication system based on time division duplex (TDD), a pair of an uplink bandwidth portion and a downlink bandwidth portion may be activated. The base station can configure a plurality of bandwidth portions within one carrier to the terminal and switch the active bandwidth portion of the terminal.

In embodiments, RB may mean CRB (common RB). Alternatively, RB may mean PRB or VRB (virtual RB). In an NR communication system, a CRB may refer to an RB that constitutes a set of consecutive RBs (e.g., a common RB grid) based on a reference frequency (e.g., point A). Carriers, bandwidth portions, etc. may be placed on the common RB grid. In other words, the carrier, bandwidth portion, etc. may be composed of CRB(s). The RB or CRB constituting the bandwidth portion may be referred to as a PRB, and the CRB index within the bandwidth portion may be appropriately converted to a PRB index. In an embodiment, RB may mean IRB (interlace RB).

The minimum resource unit constituting the PDCCH may be a resource element group (REG). REG may be composed of one PRB (eg, 12 subcarriers) in the frequency domain and one OFDM symbol in the time domain. Therefore, one REG can include 12 RE (resource elements). DM-RS (demodulation reference signal) for decoding (or demodulation) of the PDCCH can be mapped to 3 REs among the 12 REs constituting the REG, and control information (e.g., modulated DCI) It can be mapped to the remaining 9 REs.

One PDCCH candidate may consist of one CCE or aggregated CCEs. One CCE may be composed of multiple REGs. The NR communication system can support CCE aggregation levels 1, 2, 4, 8, 16, etc., and one CCE can consist of 6 REGs.

CORESET (control resource set) may be a resource area in which the terminal performs blind decoding (blind demodulation) of the PDCCH. CORESET may be composed of multiple REGs. CORESET may be composed of one or more PRBs in the frequency domain and one or more symbols (eg, OFDM symbols) in the time domain. Symbols constituting one CORESET may be continuous in the time domain. PRBs constituting one CORESET may be continuous or discontinuous in the frequency domain. One DCI (eg, one PDCCH) may be transmitted within one CORESET. Multiple CORESETs may be set from a cell perspective or a terminal perspective, and multiple CORESETs may overlap each other in time-frequency resources.

CORESET can be set in the terminal by PBCH (e.g., system information, MIB transmitted through PBCH). The ID (identifier) of CORESET set by PBCH may be 0. In other words, the CORESET set by the PBCH may be referred to as CORESET #0. A terminal operating in the RRC idle state can perform a monitoring operation in CORESET #0 to receive the first PDCCH in the initial access procedure. Not only terminals operating in the RRC idle state but also terminals operating in the RRC connected state can perform monitoring operations in CORESET #0. CORESET may be set in the terminal by other system information (eg, system information block type 1 (SIB1)) in addition to system information transmitted through PBCH. For example, to receive a random access response (or Msg2) in a random access procedure, the terminal may receive SIB1 including CORESET configuration information. Additionally, CORESET can be set in the terminal through terminal-specific higher layer signaling (e.g., RRC signaling).

One or more CORESETs for each downlink bandwidth portion may be set for the terminal. The terminal may monitor the PDCCH candidate(s) for CORESET set in the downlink active bandwidth portion in the downlink active bandwidth portion. Alternatively, the terminal may monitor the PDCCH candidate(s) for the CORESET (eg, CORESET #0) set in a downlink bandwidth portion other than the downlink active bandwidth portion in the downlink active bandwidth portion. The initial downlink active bandwidth part may include CORESET #0 and may be combined with CORESET #0. CORESET has a synchronization signal block (SSB) and quasi co-location (QCL) relationship in the primary cell (PCell), secondary cell (SCell), and primary secondary cell (PSCell). #0 can be set for the terminal. In the secondary cell, CORESET #0 may not be set for the terminal.

In the present disclosure, SSB may mean a set of signal(s) and/or channel(s) including a synchronization signal. For example, SSB may include a primary synchronization signal (PSS) and/or a secondary synchronization signal (SSS). In addition, the SSB may further include a PBCH, a DM-RS for decoding (or demodulation) of the PBCH (hereinafter referred to as “PBCH DM-RS”), and a CSI-RS. In other words, SSB may include PSS, SSS, PBCH, PBCH DM-RS, and/or CSI-RS. SSBs can be transmitted periodically and repeatedly, and within one cycle, SSBs can be transmitted more than once. When multiple SSBs are transmitted on multiple SSB resources, the multiple SSBs may correspond to different beams. In an NR communication system, SSB may be referred to as an SS/PBCH block.

The search space may be a set of PDCCH candidate(s) or a set of resource areas occupied by the PDCCH candidate(s). The UE can perform blind decoding on each of the PDCCH candidates within a predefined search space. The terminal can determine whether the PDCCH has been transmitted to it by performing a cyclic redundancy check (CRC) on the blind decoding result. If it is determined that the PDCCH is a PDCCH for the UE, the UE can receive the PDCCH. The UE may periodically monitor the search space, and may monitor the search space at one or more time locations (eg, PDCCH monitoring location, CORESET) within one period.

PDCCH candidates may consist of CCE(s) selected by a predefined hash function within CORESET or search space occurrence. The search space can be defined/set for each CCE aggregation level. In this case, the sum of the search spaces for all CCE aggregation levels may be referred to as a search space set. “Search space” may mean “a set of search spaces,” and “a set of search spaces” may mean a “search space.”

A set of search spaces can be logically associated with or correspond to one CORESET. One CORESET can be logically combined or corresponded to one or more sets of search spaces. A search space set for transmitting a common DCI or group common DCI may be referred to as a common search space set (hereinafter referred to as a “CSS set”). The common DCI or group common DCI may include at least one of PDSCH resource allocation information for transmission of system information, paging, power control command, SFI, or preemption indicator. In the NR communication system, common DCI may correspond to DCI formats 0_0, 1_0, etc. The cyclic redundancy check (CRC) of a common DCI is system information-radio network temporary identifier (SI-RNTI), paging-RNTI (P-RNTI), random access-RNTI (RA-RNTI), or temporary cell-RNTI (TC-RNTI). RNTI) can be scrambled. A common DCI with a scrambled CRC may be transmitted. Group common DCI may correspond to DCI format 2_X. X may be an integer greater than or equal to 0. The CRC of the group common DCI can be scrambled by SFI-RNTI (slot format indicator-RNTI). A group common DCI with a scrambled CRC may be transmitted. CSS sets may include Type 0, Type 0A, Type 1, Type 2, and Type 3 CSS sets.

A search space set for transmitting a UE-specific DCI may be referred to as a UE-specific search space set (hereinafter referred to as “USS set”). The UE-specific DCI may include scheduling and resource allocation information such as PDSCH, PUSCH, and PSSCH. In an NR communication system, UE-specific DCI may correspond to DCI formats 0_1, 0_2, 1_1, 1_2, 3_0, 3_1, etc. The CRC of the UE-specific DCI may be scrambled by cell-RNTI (C-RNTI), configured scheduling-RNTI (CS-RNTI), or modulation and coding scheme-C-RNTI (MCS-C-RNTI). A UE-specific DCI including a scrambled CRC may be transmitted. Considering scheduling freedom or fallback transmission, a terminal-specific DCI can be transmitted even in the CSS set. In this case, the terminal-specific DCI may be transmitted according to the DCI format corresponding to the common DCI. For example, the UE may monitor a PDCCH (e.g., DCI format 0_0, 0_1) with a CRC scrambled by C-RNTI, CS-RNTI, or MCS-C-RNTI in the CSS set.

A type 0 CSS set can be used for reception of DCI scheduling PDSCH containing SIB1. Type 0 CSS aggregation can be configured through PBCH or cell-specific RRC signaling. The ID of a type 0 CSS set can be assigned or set to 0. Type 0 CSS sets can be logically combined with CORESET #0.

The terminal can improve channel estimation performance or form a transmission/reception beam by using the large-scale propagation characteristics of the wireless channel. Large-scale propagation characteristics may be the same in channels experienced by the first signal and the second signal transmitted from the base station to the terminal. In other words, a QCL relationship can be established between the first signal and the second signal. Additionally, large-scale propagation characteristics may be the same in channels experienced by the third and fourth signals transmitted from the terminal to the base station. In other words, a QCL relationship can be established between the third signal and the fourth signal. Additionally, a QCL relationship may be established between the first signal, which is a downlink signal, and the third signal, which is an uplink signal. Several large-scale propagation characteristics can be defined by QCL parameters. For example, QCL parameters include delay spread, Doppler spread, Doppler shift, average gain, average delay, and spatial Rx parameter. It may include etc. Spatial reception parameters may correspond to characteristics such as reception beam, reception channel spatial correlation, and transmission/reception beam pair. For convenience, spatial reception parameters may be referred to as “spatial QCL”. A set of QCL parameter(s) may be referred to as a QCL type. In an NR communication system, QCL types may include Type A, Type B, Type C, Type D, etc. A Type D QCL may include spatial reception parameters and may correspond to the spatial QCL.

The base station may signal “transmission configuration indicator (TCI) status” or “TCI”, which is information indicating the QCL relationship between signals, to the terminal. In this disclosure, “TCI status” and “TCI” may be used interchangeably. Assuming that the large-scale propagation characteristics of the first signal are equally applied to the second signal, the first signal and the second signal may be referred to as a QCL source signal and a QCL target signal, respectively. The TCI status may include at least one of information about the QCL source signal (eg, ID of the source signal) or information about the QCL parameter(s) (or QCL type) for which the QCL relationship is established. The QCL source signal may include SSB, synchronization signal, reference signal (eg, CSI-RS, DM-RS), physical channel, etc. QCL target signals may include reference signals, physical channels, DM-RSs of physical channels, etc. The QCL source signal and QCL target signal may be a downlink physical signal or channel. Alternatively, the QCL source signal and QCL target signal may be uplink physical signals or channels. The transmission directions of the QCL source signal and the QCL target signal may be the same or different.

A QCL relationship for PDCCH can be established. The UE may assume that the PDCCH (eg, PDCCH DM-RS) has a QCL relationship with a certain signal. Any of the above signals may be QCL source signals. The QCL relationship may be determined based on TCI settings or instructions. Alternatively, the QCL relationship may be determined by rules predefined in technical specifications. The UE can perform channel estimation, beam forming operations, etc. for PDCCH reception based on the QCL relationship.

The same TCI or QCL relationship can be applied within one CORESET. In other words, the UE can perform monitoring operations (or reception operations) on all search space sets or PDCCH candidates belonging to the same CORESET based on the same QCL relationship. The TCI or QCL relationship applied to each CORESET can be set by the base station. Alternatively, the TCI or QCL relationship applied to each CORESET can be derived by predefined rules. The QCL relationship of a specific CORESET can be determined based on the terminal's initial access or random access procedure. For example, CORESET 0 may have a QCL relationship with the SSB selected in the initial access procedure, the PRACH recently transmitted in the random access procedure, etc. Alternatively, TCI or QCL relationships can be applied per search space set. In this case, different TCIs or different QCL relationships may be applied in the monitoring operation of multiple search space sets within the same CORESET.

Meanwhile, in a communication system, beam operation in high-frequency bands and low-frequency bands may be different. Since the path loss of the signal due to the channel is relatively small in the low frequency band (for example, the band below 6 GHz), the signal can be transmitted and received using a beam with a wide beamwidth. A beam with a wide beam width may be referred to as a wide beam. Especially in the transmission of control channels, the entire coverage of a cell (or sector) can be covered with a single beam. However, in high-frequency bands (for example, bands above 6 GHz) where signal path loss is large, beamforming using large-scale antennas can be used to expand the signal reach. Additionally, beamforming can be applied not only to data channels but also to common signal and control channels. A communication node (e.g., a base station) can form a beam with a narrow beamwidth through multiple antennas, and uses a plurality of beams with different directivity to cover the entire spatial area of the cell (or sector). This allows signals to be transmitted and received multiple times. A beam with a narrow beam width may be referred to as a narrow beam. An operation of repeatedly transmitting a signal in a plurality of time resources using a plurality of beams may be referred to as a beam sweeping operation. A system that transmits signals using multiple narrow beams like this may be referred to as a multi-beam system.

A multi-beam system may operate based on beam management. The terminal can measure the beam quality of the received signal (eg, SSB, CSI-RS, etc.) and report the measured results to the base station. For example, the terminal provides L1-RSRP (layer 1-reference signal received power), L1-SINR (layer 1-signal-to-interference-plus-noise) for each beam (e.g., each signal, each resource). Beam quality measurements such as ratio) can be calculated, and the optimal beam(s) and corresponding measurement value(s) can be reported to the base station. The base station may determine the transmission beam for the terminal based on beam quality measurement information reported from the terminal. In addition, the base station establishes TCI for transmission or reception of physical signals and channels (e.g., PDCCH, PDSCH, CSI-RS, PUCCH, PUSCH, SRS, PRACH, etc.) of the terminal based on the beam quality measurement information received from the terminal. It can be set on the terminal.

In this disclosure, TCI may be used to mean a narrow concept of beam, type D QCL, beam indication information, beam indication signaling, etc. In other words, “Beam” and “TCI” can be used interchangeably. In particular, the above-described definition can be established in embodiments related to the operation of a multi-beam system. Downlink TCI or TCI for downlink signal reception may correspond to a reception beam, and uplink TCI or TCI for uplink signal transmission may correspond to a transmission beam. Transmission beam may mean spatial relation information, transmission spatial filter, etc.

Multiple beams may be formed by multiple TRPs and/or panels. In this disclosure, TRP and panel may be collectively referred to as TRP. TRPs may be arranged based on different spatial positions, antenna shapes, radiation directions (boresight), etc., and therefore different beams (e.g., transmit beam, receive beam, transmit/receive beam) are provided in each channel formed between the TRPs and the terminal. pair) can be formed. The base station can perform multi-beam transmission using multiple TRPs, and transmission reliability can be improved by beam selection gain or beam diversity gain. The multiple TRP transmission method may be referred to as coordinated multipoint (CoMP). TRPs participating in multiple TRP transmission may belong to the same base station or the same serving cell. Alternatively, TRPs participating in multiple TRP transmission may belong to a plurality of base stations (eg, different base stations) or a plurality of serving cells (eg, different serving cells). Ideal backhaul and non-ideal backhaul can be considered as the backhaul environment between TRPs. Joint scheduling may be difficult to apply between TRPs connected through non-ideal backhaul.

[Beam (TCI) instruction method]

The UE's PDCCH reception beam (eg, TCI) and PDSCH reception beam (eg, TCI) may be individually managed by the base station. The TCI of the PDCCH can be set for the CORESET corresponding to the PDCCH. The terminal can perform PDCCH monitoring and reception operations in the search space set, PDCCH candidate, etc. corresponding to CORESET based on the TCI status included in the CORESET configuration information. In the present disclosure, signal reception operations based on TCI may include operations such as determining and applying a reception beam and channel estimation. The TCI of the PDSCH may be set or indicated separately from the TCI of the PDCCH. The TCI of the PDSCH may be included in the DCI scheduling the PDSCH and dynamically indicated to the terminal. The base station can select one TCI among the candidate TCI(s) of the PDSCH configured or activated through higher layer signaling to the terminal, and can indicate the selected TCI through the scheduling DCI. In the case of multiple TRP transmission, the DCI may include multiple TCIs, and the terminal may receive the PDSCH using the multiple indicated TCIs. Additionally, the TCI of other downlink signals (e.g., CSI-RS, TRS, PRS) may be determined independently from the TCI of the PDCCH or PDSCH.

In uplink communication, the UE's PUCCH transmission beam (eg, TCI) and PUSCH transmission beam (eg, TCI) may be managed separately. TCI (eg, transmission spatial filter or spatial relationship information) of PUCCH may be semi-fixably set in the terminal. The TCI (e.g., transmission spatial filter or spatial relationship information) of the PUSCH may be semi-fixably set in the terminal. Alternatively, the TCI of PUSCH may be included in the scheduling DCI. In other words, the TCI of PUSCH can be dynamically indicated to the terminal. The TCI of the PUSCH may be indirectly indicated by SRS resource indication information, and the terminal may apply the same TCI (e.g., transmission spatial filter or spatial relationship information) set to the indicated SRS resource to the PUSCH, PUSCH can be transmitted. Additionally, the TCI of other uplink signals (eg, SRS, PRACH) may be determined independently from the TCI of PUCCH or PUSCH.

According to the above-described method, individual beam management is possible for each transmission signal or channel, so a high degree of freedom and flexibility can be secured in the radio resource management of the base station. However, when it is desired to change beams collectively for multiple signals for a terminal, individual signaling procedures for each signal may be required. The individual signaling procedure may cause high signaling overhead and long latency.

To solve the above problem, a method of controlling the TCI of a plurality of signals (specifically, physical signals and/or physical channels) through one-time signaling to the terminal may be considered. In downlink communication, the terminal can check the downlink TCI through DCI, and the downlink TCI indicated by DCI can be applied to both PDCCH and PDSCH. Additionally, the indicated downlink TCI may be applied to downlink signals (e.g., CSI-RS, TRS, PRS) other than PDCCH and PDSCH. In uplink communication, the terminal can check the uplink TCI through DCI, and the uplink TCI indicated by DCI can be applied to both PUCCH and PUSCH. Additionally, the indicated uplink TCI may be applied to uplink signals (eg, SRS, PRACH) other than PUCCH and PUSCH. Downlink TCI and uplink TCI can be individually indicated through different DCIs. Alternatively, downlink TCI and uplink TCI may be indicated together by the same DCI. Additionally, the downlink TCI and uplink TCI may match. In this case, the TCI may be referred to as joint TCI. The joint TCI may be indicated to the terminal through DCI, and may be configured to include the above-described downlink signals (e.g., PDCCH, PDSCH, other signal(s)) and the above-mentioned uplink signals (e.g., PUCCH, PUSCH). , can be applied to all other signal(s)). The above-described TCI may be referred to as unified TCI, single TCI, etc. in the sense that it is equally applied to a plurality of signals (specifically, physical signals and/or physical channels).

A signal to which integrated TCI is applied may be a signal for transmitting terminal-specific information. For example, the PDSCH may include unicast data (eg, DL-SCH). The PDCCH may include a DCI that schedules a data channel (eg, PDSCH, PUSCH, PSSCH) including unicast data or a DCI that includes UE-specific control information. The PDCCH may be a PDCCH transmitted in a USS set and/or a specific CSS set (eg, a type 3 CSS set). Additionally, the CSI-RS, TRS, PRS, etc. may be signals set and transmitted specifically for the terminal. For another example, the PUSCH may include unicast data (eg, UL-SCH). Additionally, the SRS, PRACH, etc. may be signals that are set and transmitted specifically for the terminal. The above-described terminal-specific signal can be set in the terminal through a terminal-specific RRC signaling procedure, MAC CE, DCI, etc.

Integrated TCI may be directed by DCI. For example, a downlink DCI format (e.g., DCI format 1_0, 1_1, 1_2) including PDSCH scheduling information may be used for TCI indication. Alternatively, a downlink DCI format (eg, DCI format 1_0, 1_1, 1_2) that does not include PDSCH scheduling information may be used for TCI indication.

Figure 3 is a conceptual diagram showing a first embodiment of a TCI indication method by DCI.

Referring to FIG. 3, the base station may transmit downlink DCI including TCI indication information. The terminal can receive downlink DCI including TCI indication information. Additionally, the terminal can check the PDSCH scheduling information included in the downlink DCI. Alternatively, the downlink DCI may not include PDSCH scheduling information. In this case, specific field(s) of DCI may be set to predefined values or used for other purposes. The terminal may report HARQ-ACK (acknowledgement) to the base station in response to reception of the scheduled PDSCH or the downlink DCI. HARQ-ACK may be set to ACK or NACK (negative ACK) depending on whether reception of the scheduled PDSCH or the downlink DCI is successful. Alternatively, HARQ-ACK may be transmitted to the base station only when the scheduled PDSCH or the downlink DCI is successfully received. In this case, the HARQ-ACK can always be set to ACK. HARQ-ACK transmission resources (eg, PUCCH resources) may be determined based on the resource location of the received PDSCH. If the PDSCH is not scheduled by the DCI, HARQ-ACK transmission resources may be determined based on the virtual (or nominal) PDSCH resource allocated by the DCI.

As a specific method of TCI indication, the base station may instruct the terminal to “switch TCI.” In this case, the base station can indicate TCI to the terminal only when TCI switching is necessary, and the TCI indicated by DCI may necessarily be different from the previous TCI. In other words, in the above embodiment (eg, the embodiment of FIG. 3), the second TCI may be different from the first TCI. Alternatively, the base station may indicate “TCI to apply” to the terminal. In this case, the indicated TCI (eg, TCI to be applied) may be the same as or different from the previous TCI, and the terminal can switch TCI only if the indicated TCI is different from the previous TCI. In other words, in the above embodiment (e.g., the embodiment of FIG. 3), both “the second TCI is the same as the first TCI” and “the second TCI is different from the first TCI” may be permitted. The TCI switched by the above-described operation may be any one of downlink TCI, uplink TCI, or joint TCI.

Referring to FIG. 3, the application time of the TCI indication may be determined by a time offset (eg, T2) from the reception time of the DCI indicating the TCI. Alternatively, HARQ-ACK corresponding to the DCI may be transmitted to the base station, and the application time of the TCI instruction may be determined by a time offset (eg, T1) from the transmission time of the HARQ-ACK. Additionally, the TCI indication may be applied from the boundary of the slot (eg, start point, start symbol). The starting symbol of a slot may be the first symbol of the slot. Combining the above features, the TCI application time is the first slot that appears after a predetermined number of symbols have elapsed from any one reference symbol (e.g., the last symbol) among the symbols in which HARQ-ACK was transmitted (e.g., It can be determined by the starting point of the slot and the first symbol of the slot. In other words, T1 may mean the symbol distance between the last symbol of HARQ-ACK and the first symbol of the first slot. Alternatively, the TCI application time is the first slot that appears after a predetermined number of symbols have elapsed from any one reference symbol (e.g., the last symbol) among the symbols in which the DCI was received (i.e., the start of the slot, the first slot of the slot). symbol). In other words, T2 may mean the symbol distance between the last symbol of DCI and the first symbol of the first slot. Here, the predetermined number of symbols may be predefined in technical standards and may have different values depending on subcarrier spacing, operating frequency band, terminal capability, etc.

When the set of signals to which integrated TCI is applied is S, the TCI application point can be applied equally to all signals constituting S. If the TCI application point is the first slot, the terminal can apply the indicated TCI (eg, integrated TCI) to all signals constituting S from the first slot. This may be referred to as (Method 100). Even when (method 100) is used, the TCI of signals not included in S may operate independently of the DCI and DCI application time. In embodiments, S may include downlink signal(s), uplink signal(s), or “downlink signal(s) and uplink signal(s)” as the case may be. For example, when the uplink integrated TCI and the downlink integrated TCI are individually indicated and managed, S is connected to the uplink (e.g., uplink signals) and downlink (e.g., downlink signals). can be defined individually. For another example, when the uplink integrated TCI and the downlink integrated TCI are jointly indicated and managed, S may include both uplink signals and downlink signals to which the integrated TCI is applied.

On the other hand, integrated TCI can be applied at different times to a plurality of signals constituting S. This may be referred to as (Method 110). In (method 110), a plurality of signal groups may be set, and each signal group may include signal(s) to which integrated TCI is applied. Additionally, a plurality of TCI application timings (or a plurality of corresponding time offsets) may be set in the terminal. For example, a first TCI application time (or first time offset) and a second TCI application time (or second time offset) may be set in the terminal, and the first TCI application time and the second TCI application time Each can be applied to the first signal group and the second signal group. Each signal group can be explicitly configured from the base station. Simultaneously or separately, signals to which integrated TCI is applied may be grouped based on the TRP to which the signals belong, the serving cell to which the signals belong, the panel that transmits and receives the signals, etc.

In a similar way, the terminal can generally apply one TCI application point for the indicated TCI. However, the terminal may apply different TCI application timings for exceptional signals. The exceptional signal may refer to a signal that satisfies a specific condition or a signal that does not satisfy a specific condition. This may be referred to as (Method 111). Below, examples supporting (Method 111) will be described.

Figure 4 is a conceptual diagram illustrating a first embodiment of a method of applying integrated TCI to a plurality of signals.

Referring to FIG. 4, the terminal may receive DCI, and the DCI may indicate downlink integrated TCI or joint integrated TCI. The previous downlink TCI may be the first TCI, and the DCI may instruct the terminal to apply the second TCI to downlink signals. The application time of the second TCI may be slot (n+1). The terminal can apply the second TCI to the reception of downlink signals included in S from slot (n+1). In other words, the first TCI may be applied to the first downlink signal shown in FIG. 4, and the second TCI may be applied to the second downlink signal.

The first downlink signal and the second downlink signal may each be one of PDCCH, PDSCH, or CSI-RS. The resources of the first downlink signal and the resources of the second downlink signal may be independently set or indicated. There may be no correlation between the resources of the first downlink signal and the resources of the second downlink signal. For example, the first downlink signal may be the first PDSCH corresponding to the first TB, and the second downlink signal may be the second PDSCH corresponding to the second TB. The first PDSCH and the second PDSCH may be scheduled by different signaling (eg, different DCI). At least one of the first PDSCH or the second PDSCH may be an SPS PDSCH allocated by semi-permanent scheduling. For another example, the first downlink signal may be a PDSCH included in S, and the second downlink signal may be a CSI-RS (e.g., aperiodic CSI-RS) included in S. . For another example, the first downlink signal may be a PDCCH included in S, and the second downlink signal may be a PDSCH. In the above-described embodiment, the first TCI, which is the previous TCI, may be applied to the first downlink signal, and the second TCI, which is the indicated TCI, may be applied to the second downlink signal.

Meanwhile, by (method 111), the application timing of the indicated TCI may be exceptionally different for some signals constituting S. In the above embodiment, the third downlink signal may be a signal that is related to the first downlink signal. For example, the first downlink signal and the third downlink signal may be PDSCHs (or PDSCH instances) that constitute repetitive PDSCH transmission. In other words, the first downlink signal and the third downlink signal may respectively correspond to the first PDSCH instance and the second PDSCH instance repeatedly transmitted for the same TB(s). At this time, the same TCI can be applied to the reception of PDSCH instances constituting repeated PDSCH transmission for the same TB.

According to the proposed method, the above rule can take precedence over TCI indication by DCI. In other words, the third downlink signal corresponding to the second PDSCH instance has the same TCI (e.g., first TCI) applied to the first PDSCH instance instead of the TCI (e.g., second TCI) indicated by the DCI. It can be applied easily. Although the third downlink signal is transmitted in a section to which the indicated TCI is applied, exceptionally, the indicated TCI may not be applied to the third downlink signal. In other words, the timing of application of the TCI indicated for the signal may be delayed. The timing of application of the indicated TCI may be delayed on a slot-by-slot basis. The application time of the indicated TCI may be delayed by N slots from the slot that is the original application time of the indicated TCI. N may be a natural number. The PDSCH repetitive transmission can be dynamically scheduled by DCI. Alternatively, the PDSCH repeated transmission may be SPS PDSCH.

Among the target signals constituting S, the signal belonging to the same slot (or the same subframe, the same subslot, etc.) as the third downlink signal is the TCI (e.g., first TCI) actually applied to the third downlink signal. can be applied equally. According to this, the terminal can apply the first TCI not only to the third downlink signal but also to the second downlink signal. The terminal may apply the previous TCI (e.g., the first TCI) to the slot (n+1) to which the third downlink signal belongs, and the slot after slot (n+1) (e.g., slot ( Starting from n+2)), the indicated TCI (for example, the second TCI) can be applied. In other words, the timing of TCI application may be delayed for all signals constituting S. Generalizing the above embodiment, if there is at least one signal to which the indicated TCI is not applied exceptionally in a certain slot after the TCI application point, the indicated TCI may not be applied to all target signals in the certain slot. , the timing of TCI application may be postponed until after any of the above slots. At this time, the delayed TCI application time may be the earliest slot to which a signal to which the exceptionally indicated TCI is not applied is not mapped among slots that appear after the original TCI application time indicated by the DCI. Alternatively, the delayed TCI application time is the earliest slot in which a signal to which the exceptionally indicated TCI is not applied is not mapped and a signal belonging to S is mapped among slots that appear after the original TCI application time indicated by DCI. It can be. According to the above-described method, the terminal can apply only one TCI in one slot to at least signals belonging to S. Therefore, the complexity of beam management and transmission and reception of the terminal can be reduced.

Alternatively, signals to which the previous TCI is exceptionally applied (e.g., signals to which a delayed TCI application time is applied) may be limited to signals that satisfy the exception conditions, and may be placed in the same slot as the signal among target signals. The indicated TCI may be applied according to the normal TCI application time (e.g., nominal TCI application time) to other signals belonging to the signal. The above-described method may correspond to (method 111). According to this, the terminal can apply the first TCI, which is the previous TCI, to the third downlink signal, and the second TCI, which is the indicated TCI, can be applied to the second downlink signal. As another method, as an exception, the previous TCI may be applied to some signals among other target signals belonging to the same slot as the signal to which the previous TCI is applied, and the indicated TCI may be normally applied to some other signals. The signal to which the previous TCI is applied and the signal to which the indicated TCI is applied may be determined based on the relative resource position with the exception signal. For example, the same TCI as the exception signal may be applied to a signal transmitted earlier or later than the exception signal, and the TCI indicated for the signal transmitted later than or not earlier than the exception signal may be applied normally. It can be applied. In other words, the point in time at which TCI is applied may be determined by any symbol (eg, the first symbol) to which the exceptional signal is mapped in the indicated slot. Among signals belonging to S, the indicated TCI can be applied to the symbol or a signal starting after the symbol. In other words, the timing of application of the indicated TCI may be delayed on a symbol basis. In other words, the application time of the indicated TCI may be delayed by M symbols (or by N slots and M symbols) compared to the first symbol of the slot according to the original application time. Each of M and N may be a natural number.

Figure 5 is a conceptual diagram illustrating a second embodiment of a method of applying integrated TCI to a plurality of signals.

The difference between the second embodiment of FIG. 5 and the first embodiment of FIG. 4 may be that the second downlink signal and the third downlink signal overlap in time. In other words, the previous downlink TCI may be the first TCI, and the terminal may receive a DCI indicating application of the second TCI to downlink signals and/or uplink signals from slot (n+1). You can. In this case, “if the resources of the second downlink signal overlap with the resources of the third downlink signal” or “if the TCI indicated in the second downlink signal and the TCI indicated in the third downlink signal are different”, The terminal can selectively receive one downlink signal among the downlink signals according to a priority rule. When the terminal receives the third downlink signal, the same TCI as the TCI of the first downlink signal can be applied to the third downlink signal instead of the indicated TCI by the above-described method. When the terminal receives the second downlink signal, the second TCI, which is the indicated TCI, can be normally applied to the second downlink signal. In other words, whether to apply the indicated TCI, whether there is a delay at the time of TCI application, etc. may be determined based on the priority or actual reception of the third downlink signal associated with the signal of the previous slot. Meanwhile, the terminal can expect to receive both the overlapping second and third downlink signals. In this case, the same TCI can be applied to the downlink signals, and the TCI can be determined as the previous TCI or indicated TCI by the method described above.

In an embodiment, an integrated TCI may be indicated to the terminal, and a first signal belonging to S and a second signal not belonging to S may overlap in time in a section (e.g., slot) to which the integrated TCI is applied. . When the first signal and the second signal are downlink signals, the terminal can receive either the first signal or the second signal according to the priority rule. Additionally, when the first signal and the second signal are uplink signals, the terminal can transmit either the first signal or the second signal according to a priority rule. The terminal may preferentially receive or transmit the first signal belonging to S (eg, a signal to which integrated TCI is applied). At this time, the terminal may not receive or transmit the second signal that does not belong to S. Alternatively, the terminal may receive or transmit the second signal based on the TCI (eg, integrated TCI) applied to the first signal. Alternatively, different TCIs may be applied to symbol(s) that overlap with the first signal and to symbol(s) that do not overlap among the symbols to which the second signal is mapped. For example, the integrated TCI may be applied to the symbol(s) that overlaps the first signal among the symbols to which the second signal is mapped, and the indicated TCI may be applied to the symbol(s) that does not overlap the first signal among the symbols to which the second signal is mapped. Can be applied to symbol(s).

The method of determining TCI application timing according to the above-described transmission priority may be more effective for uplink transmission. Referring to FIG. 5, the first uplink signal and the third uplink signal may be interrelated signals, and the second uplink signal and the third uplink signal may overlap in time in slot (n+1). At this time, the terminal can selectively transmit one uplink signal among the uplink signals according to a priority rule. According to the above-described method, when the terminal transmits the third uplink signal, the same TCI as the TCI of the first uplink signal can be applied to the third uplink signal instead of the indicated TCI. When the terminal transmits a second uplink signal, the indicated TCI can be normally applied to the second uplink signal. In other words, whether to apply the indicated TCI, whether there is a delay at the time of TCI application, etc. may be determined based on the priority or actual transmission of the third uplink signal associated with the signal of the previous slot. Meanwhile, the terminal can transmit both the overlapping second and third uplink signals. Alternatively, the terminal can expect to transmit at least all of the overlapping second and third uplink signals. In this case, the same TCI can be applied to the uplink signals, and the TCI can be determined as the previous TCI or indicated TCI by the method described above.

As another method of applying integrated TCI to a plurality of signals, the first signal before the application point of the indicated integrated TCI and the second signal after the application point are transmitted for a predetermined reason (e.g., repeated transmission, same CSI -The integrated TCI indicated in the second signal and other signals in the corresponding section (e.g., all signals in set S) even if they are related to each other due to inclusion in the RS resource set, inclusion in the same SRS resource set, etc. can be applied as is. Additionally, the previous TCI may be applied to the first signal and other signals in the corresponding section (eg, all signals in set S). In the embodiments of Figures 4 and 5, according to the above-described method, the terminal applies the integrated TCI (e.g., the second TCI) indicated by the DCI to the second downlink signal and the third downlink signal. You can. Alternatively, the terminal may apply the integrated TCI (eg, second TCI) indicated by DCI to the second uplink signal and the third uplink signal. The terminal can apply the first TCI, which is the previous TCI, to the first downlink signal or the first uplink signal.

As another method of applying integrated TCI to a plurality of signals, the terminal may not expect to receive an instruction to apply integrated TCI at a time between the resources of the first signal and the resource of the second signal that are related to each other. . Alternatively, the terminal may not expect to receive an instruction to apply different integrated TCI to the resources of the first signal and the resource of the second signal that are related to each other (eg, an instruction of an integrated TCI switching operation). According to the latter method, in the embodiments of FIGS. 4 and 5, the terminal may be instructed to apply the integrated TCI (e.g., the second TCI) starting from slot (n+1), and the second TCI may be the same as the first TCI, which is the previous TCI.

In the above embodiment, the first downlink signal and the third downlink signal may be PDCCHs that constitute PDCCH repetitive transmission. For example, the first downlink signal and the third downlink signal may correspond to a first PDCCH candidate and a second PDCCH candidate that are linked or associated with each other, respectively. PDCCH candidates connected to each other may belong to the same CORESET and may be set to be monitored based on the same TCI. Alternatively, PDCCH candidates connected to each other may belong to different CORESETs and may be set to be monitored based on the TCI of each of the different CORESETs. At this time, the operation of applying the integrated TCI to the first PDCCH candidate and the second PDCCH candidate may be the same as the operation described above.

In the above embodiment, the first downlink signal and the third downlink signal may correspond to the first CSI-RS and the second CSI-RS, respectively, and the first CSI-RS and the second CSI-RS may be connected to the same beam or Reception based on the same TCI can be configured in the terminal. For example, the first CSI-RS and the second CSI-RS may respectively correspond to the first CSI-RS resource and the second CSI-RS resource belonging to the same CSI-RS resource set. Repeated transmission may be set in the first CSI-RS resource and the second CSI-RS resource. The UE can measure beam quality (eg, L1-RSRP, L1-SINR) based on the received first CSI-RS and second CSI-RS and report the measurement results to the base station. At this time, the operation of applying the integrated TCI to the first CSI-RS and the second CSI-RS may be the same as the operation described above.

For example, the TCI indicated in the second CSI-RS may not be applied. A previous TCI (eg, TCI applied to slot n) may be applied to the second CSI-RS. Accordingly, the same integrated TCI may be applied to the first CSI-RS and the second CSI-RS, and TCI switching may not occur. The above-described method can generally be applied to CSI-RS resources that are repeatedly transmitted M times (eg, CSI-RS resources belonging to the same CSI-RS resource set). M may be a natural number. For another example, the UE may not expect to receive an instruction to apply TCI at the boundary between the first CSI-RS resource and the second CSI-RS resource. Alternatively, the UE may not expect to receive an instruction to apply different TCIs to the first CSI-RS and the second CSI-RS. As a result, the terminal can receive repeatedly transmitted CSI-RSs based on the same TCI. For another example, a second TCI, which is an integrated TCI indicated in the second CSI-RS, may be applied. The first TCI, which is the previous TCI, can be applied to the first CSI-RS. As a result, repeatedly transmitted CSI-RSs can be received based on different TCIs.

For another example, in the case described above, the terminal may omit reception of some CSI-RSs. The UE can receive the first CSI-RS based on the previous TCI and skip the reception operation of the second CSI-RS. In other words, the terminal can omit the reception operation of CSI-RS(s) after the point of application of the indicated TCI. Alternatively, the UE may not receive both the first CSI-RS and the second CSI-RS. In other words, the terminal can omit the reception operation of all repeatedly transmitted CSI-RSs. The latter method can be used when the terminal has already recognized the TCI indication or acquired the indicated TCI before starting the reception operation of the first CSI-RS (e.g., the first CSI-RS) constituting repeated transmission. there is. The above-described method can be equally applied not only to CSI-RS repeated transmission, but also to the above-described PDSCH repeated transmission, the above-described PDCCH repeated transmission, and/or the repeated transmission of an uplink signal to be described later. In other words, the first CSI-RS and the second CSI-RS can be generalized into a first signal and a second signal that are related to each other.

The UE performs radio resource management (RRM) measurement operations (e.g., RSRP, RSRQ, SINR measurement), RLM (or CSI-RSs configured to apply the same TCI) that are repeatedly transmitted. radio link monitoring) measurement operations, beam quality measurement operations, etc. can be performed, and the measurement results can be reported to the base station. When repeatedly transmitted CSI-RSs are received based on different TCIs, the UE can perform the measurement operation using only some CSI-RS(s). The same TCI may be applied to some of the CSI-RS(s). The base station can determine the transmission beam for the terminal based on the report.

As described above, the above embodiments can be implemented for uplink transmission. In the above embodiments, the operation of the terminal can be applied to the first uplink signal, the second uplink signal, and the third uplink signal. The first uplink signal and the third uplink signal may be signals related to each other. For example, the first uplink signal and the third uplink signal are PUSCHs (or PUSCH instances) constituting repetitive PUSCH transmission, PUCCHs (or PUCCH instances) constituting repetitive PUCCH transmission, or repetitive These may be transmitted SRSs. For example, the first uplink signal and the third uplink signal may mean a first SRS (or first SRS resource) and a second SRS (or second SRS resource) constituting the same SRS resource set. there is. At this time, the operation of the terminal determining the TCI to apply to each uplink signal may be the same or similar to the operation described in the above embodiments.

In the above embodiment, the first uplink signal and the third uplink signal may be PUSCH(s) for one TB. Alternatively, when the number of transport layers is greater than the reference value, the first uplink signal and the third uplink signal may be PUSCH(s) for two TBs. For example, one PUSCH including the one TB may be mapped to both the resources of the first uplink signal and the resources of the third uplink signal. In other words, one PUSCH can be mapped to multiple slots.

Additionally, in the above embodiment, the terminal may apply joint channel estimation to the first uplink signal and the third uplink signal, and the joint channel estimation operation may be performed based on configuration information received from the base station. Each of the first uplink signal and the third uplink signal may be a PUSCH, and DM-RS may be shared between the PUSCHs. Alternatively, each of the first uplink signal and the third uplink signal may be a PUCCH, and DM-RS may be shared between the PUCCHs. Specifically, the DM-RS of the first uplink signal and/or the channel estimated based on the DM-RS may be used for decoding not only the first uplink signal but also the third uplink signal. The DM-RS of the third uplink signal and/or the channel estimated based on the DM-RS may be used for decoding not only the third uplink signal but also the first uplink signal. Alternatively, decoding of the first uplink signal and the third uplink signal may be performed based on the DM-RS of the first uplink signal and/or the DM-RS of the third uplink signal. To support the above operation, a time domain window for PUSCH (or PUCCH) may be set in the terminal, and the terminal applies the same transmission power to a plurality of PUSCHs (or a plurality of PUCCHs) belonging to the time window. and the PUSCHs (or PUCCHs) can be transmitted. The base station may apply the above-described joint channel estimation method to reception of the PUSCHs (or the PUCCHs) within a time window. According to the above embodiments, the same integrated TCI can be applied to the transmission of the plurality of PUSCHs (or the plurality of PUCCHs), and based on this, the joint TCI can be applied to the plurality of PUSCHs (or the plurality of PUCCHs) A channel estimation method may be performed.

Additionally, in the above embodiment, the first uplink signal and the third uplink signal may respectively correspond to the first SRS and the second SRS that are repeatedly transmitted. The terminal may transmit the first SRS and the second SRS based on the same beam or the same TCI based on configuration information from the base station. At this time, the operation of the terminal applying the integrated TCI to the second SRS can be performed in the same manner as the above-described embodiments.

In the above embodiment, downlink signal(s) or uplink signal(s) may be scheduled by DCI indicating integrated TCI. In the first embodiment of FIG. 4, the first downlink signal and the third downlink signal may be PDSCHs scheduled by DCI indicating integrated TCI. The PDSCHs may be repeated transmissions for the same TB. Alternatively, the PDSCHs may correspond to different TBs. The first uplink signal and the third uplink signal may be PUSCHs or PUCCHs scheduled by DCI indicating integrated TCI. The PUSCHs (or PUCCHs) may be repeated transmissions for the same TB (or the same payload). Alternatively, the PUSCHs (or PUCCHs) may correspond to different TBs (or payloads).

Referring again to FIG. 3, the indicated integrated TCI may not be applied to the PDSCH scheduled by the DCI indicating the integrated TCI. Specifically, if the PDSCH is allocated before the time of application of the TCI, a previous TCI, rather than the indicated TCI, may be applied to the PDSCH. In this case, since fast beam switching is not applied to the PDSCH, reception performance of the PDSCH may be degraded. With the proposed method, the base station can generate a DCI (e.g., DCI indicating integrated TCI) containing a separate field (e.g., identifier), and transmit the DCI to the terminal. The field of the DCI (eg, the separate field) can be used to control the TCI of the PDSCH scheduled by the DCI. Similarly, the indication information for controlling the TCI of the PDSCH scheduled by the DCI is an integrated TCI indication field in the DCI instead of a separate field (e.g., specific bit(s) or specific codepoint(s) of the integrated TCI indication field). )) It can be transmitted to the terminal based on. The above-described method may be referred to as (method 200).

According to an embodiment, when the identifier is designated as a specific value (for example, '0'), the terminal may apply a previous TCI, rather than the TCI indicated by the DCI, to the PDSCH scheduled by the DCI. Conversely, if the identifier is designated as another specific value (e.g., '1'), the DCI may directly indicate the TCI of the PDSCH it schedules. In other words, the UE can apply the TCI indicated by the DCI to the PDSCH scheduled by the DCI. According to another embodiment, the above-described operation may be performed based on the presence or absence of the separate field in the DCI. For example, when the DCI includes the separate field (e.g., when the size of the separate field is 1 bit or more), the terminal transmits the DCI (e.g., The TCI indicated by (separate field above) can be applied. At this time, the indicated TCI can be applied not only to the PDSCH but also to other downlink signals in the slot to which the PDSCH is mapped. Specifically, the indicated TCI may be applied to the signal(s) constituting S among all downlink signal(s) of the slot to which the PDSCH is mapped. Alternatively, the indicated TCI may be applied to downlink signal(s) that temporally overlap (or share a symbol) with the PDSCH among the signals constituting S.

According to (method 200), two TCIs can be indicated to the terminal by the same DCI (ie, the DCI). In other words, the two TCIs may include a first TCI and a second TCI. The first TCI may be an integrated TCI indicated by the DCI. The second TCI may be a TCI applied to PDSCH, CSI-RS, PUSCH, PUCCH, SRS, etc. scheduled by the DCI.

The above-described method can be used only when the PDSCH is earlier than the first TCI application time. In other words, in this case, the second TCI can be applied to the PDSCH, and in the remaining cases, the first TCI can be applied to the PDSCH. Alternatively, the method described above can be used generally regardless of the PDSCH scheduling timing. Even if the PDSCH is mapped after the time of application of the first TCI, the second TCI, rather than the first TCI, may be applied to the PDSCH. In other words, the integrated TCI may be replaced by the separately indicated TCI. Alternatively, priority may be considered between the first TCI and the second TCI. The UE can select one of the two TCIs based on a priority rule predefined or set by the base station, and receive the PDSCH based on the selected TCI. Alternatively, if the PDSCH is mapped after the application time of the first TCI, the UE may not expect the first TCI and the second TCI to be indicated differently.

[Indicating method of multiple TRP beam (TCI)]

Meanwhile, in an environment where multiple TRPs are deployed, signals can be transmitted and received from a plurality of TRPs. A downlink signal (eg, PDSCH, PDCCH) may be transmitted from a plurality of TRPs to the terminal, and an uplink signal (eg, PUSCH, PUCCH) may be transmitted from the terminal to a plurality of TRPs. The terminal may apply different downlink TCIs (or different downlink beams) to the reception of downlink signals transmitted from a plurality of TRPs, and different downlink TCIs (or different downlink beams) may be applied to the transmission of uplink signals transmitted to a plurality of TRPs. Uplink TCI (or different uplink beams) can be applied.

Multiple TRP transmissions can be scheduled by a single DCI. For example, one downlink DCI can schedule multiple PDSCHs, and multiple downlink TCIs can be applied to multiple PDSCHs. Additionally, one uplink DCI can schedule multiple PUSCHs or multiple PUCCHs, and multiple uplink TCIs can be applied to multiple PUSCHs or multiple PUCCHs. The PDSCHs (or PUSCHs) may be PDSCH instances (or PUSCH instances) that constitute repetitive PDSCH transmission (or repetitive PUSCH transmission) for the same TB. Alternatively, the PDSCHs (or PUSCHs) may be PDSCHs (or PUSCHs) corresponding to different TBs.

Alternatively, multiple TRP transmission may be scheduled by multiple DCIs each transmitted from multiple TRPs. A CORESET pool may be set in the terminal to support the above operation. For example, the terminal may receive configuration information of the first CORESET pool and the second CORESET pool, and each CORESET pool may be composed of one or more CORESET(s). Alternatively, for some purposes, a specific CORESET pool may be set as an empty CORESET pool that does not contain CORESET. TCI for PDCCH monitoring can be set for each CORESET pool. In other words, CORESETs belonging to the same CORESET pool can be monitored based on the same TCI. One TCI can be set in each CORESET pool. Alternatively, multiple TCIs may be set in a certain CORESET pool. In this case, the PDCCH in the CORESET pool may be transmitted based on a single frequency network (SFN) method, and the terminal may monitor the PDCCH using all of a plurality of TCIs.

When a terminal performs multiple TRP transmission, multiple integrated TCIs may be indicated to the terminal. The DCI indicating the above-described integrated TCI may indicate a plurality of integrated TCIs in the same transmission direction, and the terminal may perform a downlink reception operation or an uplink transmission operation based on the plurality of integrated TCIs indicated. . For example, two downlink integrated TCIs, two uplink integrated TCIs, or two joint integrated TCIs may be indicated through DCI. The base station can configure the terminal to apply multiple integrated TCIs.

Figure 6 is a conceptual diagram illustrating a first embodiment of an integrated TCI indication method for multiple TRP transmission.

Referring to FIG. 6, the terminal can check one or multiple integrated TCI(s) through DCI. In other words, DCI can indicate one or multiple integrated TCI(s) to the terminal. For example, for downlink and/or uplink, the first DCI may indicate the first TCI, the second DCI may indicate the second TCI and the third TCI, and the third DCI may indicate the fourth TCI. TCI can be indicated. In other words, one integrated TCI may be indicated to the terminal for a certain section, and multiple (e.g., two) integrated TCIs may be indicated to the terminal for another section. The number of integrated TCIs indicated to the terminal by DCI can be changed dynamically.

The start point (eg, start slot) at which the plurality of integrated TCIs indicated above are applied may be the same. For example, the second TCI and third TCI indicated by the second DCI may be applied simultaneously from time t2 (or slot corresponding to t2). The terminal may receive (or monitor) a downlink signal transmitted in the application section of the second TCI and the third TCI based on at least one of the second TCI or the third TCI. Additionally, the terminal can apply the first TCI, which is the previous TCI, until the application section of the second TCI and third TCI. According to the above-described method, the beam adaptation operation of the terminal and the beam management procedure of the base station can be simplified, and the implementation complexity of the terminal and the base station can be reduced.

Figure 7 is a conceptual diagram illustrating a second embodiment of an integrated TCI indication method for multiple TRP transmission.

Referring to FIG. 7, similar to the embodiment of FIG. 6, the terminal can confirm one or multiple integrated TCI(s) through DCI. In other words, DCI can indicate one or multiple integrated TCI(s) to the terminal. For example, for downlink and/or uplink, the first DCI may indicate the first TCI, and the second DCI may indicate the second TCI and the third TCI. According to the embodiment of FIG. 7, the TCIs may be applied at different times. The second TCI can be applied starting from time t2 or the slot corresponding to t2, and the third TCI can be applied starting from time t3 or the slot corresponding to t3. As a result, both the second TCI and the third TCI can be applied to the section starting from t3. At this time, the first TCI, which is the previous TCI, may be applied before time t2 and may not be applied after time t2. Alternatively, the first TCI may be used together with the second TCI in the section between t2 and t3 before the third TCI is applied. For example, the UE may perform a reception operation of a downlink signal (eg, repeatedly transmitted PDSCHs) based on the first TCI and the second TCI in the slot(s) between t2 and t3.

Generalizing the above-described operation, “applying multiple integrated TCIs (or N integrated TCIs) is configured in the terminal, and a single integrated TCI (or less than N integrated TCIs) is applied in a predetermined interval. “When instructed to the terminal,” the terminal can transmit and receive signals by applying multiple integrated TCIs (or N integrated TCIs) in the predetermined section. In an embodiment where N=2, two integrated TCIs may include one integrated TCI indicated above and a previous TCI (eg, a TCI applied to a section before the predetermined section). Alternatively, the two integrated TCIs may include one integrated TCI and a default TCI (or reference TCI) indicated above. The operation by which the terminal determines the default TCI may be predefined in the technical specifications. For example, “TCI recently used for monitoring of CORESET” or “TCI configured or activated for PDSCH reception” can be used as the default TCI.

Figure 8 is a conceptual diagram showing a third embodiment of an integrated TCI indication method for multiple TRP transmission.

Referring to FIG. 8, similar to the embodiment of FIG. 6 and/or FIG. 7, the terminal can confirm one or more integrated TCI(s) through DCI. In other words, the DCI may indicate one or multiple integrated TCI(s) to the terminal. For downlink and/or uplink, the first TCI may be indicated by the first DCI, and the second TCI and third TCI may be indicated by the second DCI. Additionally, the first PDSCH and the second PDSCH may be scheduled by the second DCI. For example, the first PDSCH and the second PDSCH may be PDSCH instances that constitute repeated PDSCH transmission. Additionally, the first PDSCH and the second PDSCH may correspond to special cases of the first and second signals that are respectively associated with each other (eg, repeatedly transmitted). At this time, regardless of the integrated TCI indicated by the second DCI, when receiving the first PDSCH and the second PDSCH, the TCI applied to the time interval (e.g., slot) to which the first PDSCH and the second PDSCH are allocated is It can be applied. The first PDSCH and the second PDSCH may be received based on the first TCI. In other words, the PDSCH repeated transmission can be transmitted by a single TRP.

Meanwhile, unlike the above embodiment, the first PDSCH and the second PDSCH scheduled by the DCI may belong to different TCI sections. For example, the first PDSCH may be assigned to a slot before t2, and the second PDSCH may be assigned to a slot after t2 or corresponding to t2. In this case, similar to the above-described operation, the TCI applied to each PDSCH may be the TCI applied to the TCI section to which each PDSCH belongs. For example, 1st TCI, which is a previous TCI, can be applied to the first PDSCH, and at least one TCI among the 2nd TCI or the 3rd TCI, which is an integrated TCI indicated by DCI, can be applied to the second PDSCH. The rules by which the terminal selects the at least one TCI may be predefined in technical specifications. For example, the at least one TCI may be determined based on the TCI index of integrated TCIs, TCI configuration order, TCI index in a TCI pool, etc. Alternatively, the same TCI(s) may be applied to the first PDSCH and the second PDSCH. In this case, the first TCI applied to the first PDSCH, which is the first PDSCH, may be equally applied to the second PDSCH. Alternatively, the UE may not expect the first PDSCH and the second PDSCH to be allocated to belong to different TCI sections. The different TCI sections may mean TCI sections in which different TCI(s) are indicated.

Transmission based on a single TCI may be allocated in a section where multiple integrated TCIs are indicated. For example, a signal transmitted once without repeated transmission in the section where the second TCI and the third TCI are indicated, a signal set to be received based on one TCI, etc. may be allocated. The signal may include downlink signals such as PDCCH, PDSCH, and CSI-RS, or uplink signals such as PUCCH, PUSCH, and SRS. In this case, the signal may be received based on the integrated TCI(s) indicated in the section to which the signal is allocated, rather than the TCI set for the signal. The above-described method may be referred to as (method 300). In the following examples (method 300) will be described in detail.

FIG. 9 is a conceptual diagram illustrating a first embodiment of a method for determining a TCI to be applied to a scheduled PDSCH.

Referring to FIG. 9, the terminal can receive the first DCI and check scheduling information of the first PDSCH based on the received first DCI. Additionally, the terminal can receive the second DCI and check scheduling information of the second PDSCH based on the received second DCI. The terminal can check the integrated TCI through DCI. In other words, the DCI can indicate the integrated TCI to the terminal. For example, the first DCI may instruct the terminal to apply two integrated TCIs (eg, a third TCI and a fourth TCI). The application point of the indicated TCIs, indicated as t1 in the drawing, may mean the first slot, the start symbol of the first slot, or the start boundary of the first slot. The terminal may receive a downlink signal based on the 1st TCI and 2nd TCI, which are previous TCIs, up to the slot before the 1st slot, and based on the 3rd TCI and 4th TCI, which are TCIs indicated from the 1st slot. Downlink signals can be received.

According to (method 300), the base station may transmit the first PDSCH and the second PDSCH based on a single TCI in a section where multiple integrated TCIs (eg, integrated TCI information) are indicated. As a preliminary procedure for the above operation, the terminal receives information (e.g., configuration information) indicating to perform an operation for receiving a PDSCH (e.g., downlink channel, DL data) based on a single TCI from the base station. You can receive it. Alternatively, in a procedure corresponding to the above procedure, the base station may not configure the terminal to “perform an operation to receive a PDSCH based on multiple TCIs.” The above settings may be applied to each bandwidth portion or each serving cell (or each serving cell group). At this time, the first PDSCH and the second PDSCH can be received based on the TCI indicated in the section to which each PDSCH is allocated. For example, the first PDSCH may be received based on one of the first TCI and the second TCI, which are a plurality of integrated TCIs indicated in the section to which the first PDSCH is allocated, and the second PDSCH may be received based on the first TCI and the second TCI. 2 PDSCH may be received based on one of the third TCI and fourth TCI, which are a plurality of integrated TCIs indicated in the allocated section.

The operation of the terminal selecting one TCI to apply to PDSCH reception among the plurality of integrated TCIs may be performed according to a predefined rule. For example, among the indicated integrated TCI(s) (e.g., TCI pair), the first TCI, the TCI with the lowest index, the TCI with the highest index, etc. may be selected. Specifically, the first TCI is the first TCI, the earliest TCI, the previously indicated TCI, and MSB(s) among the TCIs indicated by the RRC parameter, MAC CE, DCI bit, or DCI code point for integrated TCI configuration. It may mean a TCI corresponding to the most signification bit(s), a TCI corresponding to the least signification bit(s) (LSB(s)), etc. In the above embodiment, the first TCI and the third TCI may correspond to the above-described first TCI, etc., and the first TCI and the third TCI may be applied to the first PDSCH and the second PDSCH, respectively, according to the above rules. Alternatively, the base station may configure or indicate to the terminal one TCI to be applied to PDSCH reception among the plurality of integrated TCIs through a signaling procedure. Likewise, the one TCI may refer to TCIs described in a message or a TCI having a specific order in a TCI pair.

As another method, one TCI to be applied to PDSCH reception among the plurality of integrated TCIs may be dynamically indicated to the terminal by (method 200). As described above, information indicating the one TCI may be included in a DCI (eg, DCI format 1_0, 1_1, 1_2, etc.) for scheduling the PDSCH. At the same time, the scheduling DCI may include information indicating integrated TCI(s). In the first embodiment of FIG. 9, the scheduling DCI may correspond to the first DCI. The terminal can check the integrated TCIs (e.g., the 3rd TCI and the 4th TCI) through the first DCI, and perform downlink reception operations (e.g., the downlink included in set S) from time t1 on the integrated TCIs. It can be applied to the reception operation of link signal(s). At the same time, the terminal can confirm one TCI to be applied to reception of the first PDSCH through the first DCI. The one TCI may be one of the first TCI and the second TCI, which are integrated TCIs of the section in which the first PDSCH is scheduled. The one TCI may be determined by the base station. The information indicating one TCI may belong to the same DCI field as the integrated TCI indicating information. Alternatively, the information indicating one TCI and the integrated TCI indicating information may be divided into different fields within the DCI. When repetitive PDSCH transmission is scheduled, information indicating one TCI can be applied to all PDSCHs that constitute repetitive transmission. However, the TCI actually applied to each PDSCH constituting the repetitive transmission may be the same or different depending on the integrated TCI(s) indicated in the slot to which each PDSCH is allocated.

Meanwhile, the start point of the PDSCH (eg, start symbol, start slot) may be dynamically indicated by the DCI that schedules the PDSCH. At this time, the time offset (eg, symbol offset) between the start symbol of the PDSCH and the end symbol of the scheduling DCI may be referred to as the scheduling offset of the PDSCH. If the scheduling offset is greater than or equal to the reference value (or threshold), the terminal may obtain the TCI indication information included in the scheduling DCI before starting the PDSCH reception operation, and based on the indicated TCI (e.g., TCI indication information) PDSCH can be received. On the other hand, if the scheduling offset is less than (or less than) the reference value, the UE may not be able to obtain the TCI indication information included in the scheduling DCI before starting the PDSCH reception operation, and may use the PDSCH based on a TCI other than the indicated TCI. can receive. The other TCI may be referred to as the default TCI for convenience. The default TCI may be determined as any one of the integrated TCI(s) applied to the section in which the PDSCH is scheduled. The reference value or threshold may be expressed as the number of symbols and/or the number of slots corresponding to the time required for PDCCH decoding of the terminal. The reference value or threshold may be predefined in technical specifications. Alternatively, the reference value or threshold may be transmitted from the base station to the terminal through a signaling procedure.

The above embodiment can be performed in combination with the PDSCH reception operation based on the default TCI described above. Referring again to FIG. 9, the scheduling offset of the first PDSCH may be expressed as T _offset,1 . T _offset,1 may be smaller than the above reference value. The terminal can receive the first PDSCH based on the default TCI. The default TCI may be determined as any one of the first TCI and the second TCI, which are integrated TCI(s) applied to the PDSCH allocated section (e.g., slot). For example, the terminal may determine the first TCI, which is the first TCI of the section, as the default TCI for receiving the first PDSCH. By the same method, the terminal can determine the third TCI, which is the first TCI, as the default TCI for receiving the second PDSCH in the section after t1. For another example, the default TCI may be determined to be any one of the TCI(s) recently applied to control channel (eg, PDCCH) monitoring. The default TCI can be set as the TCI applied to any one of the CORESET(s) mapped to the most recent slot to which the CORESET is mapped. Alternatively, the default TCI may be set to any one of the TCI(s) configured or activated for PDSCH transmission.

Meanwhile, the scheduling DCI may not include information indicating one TCI to be applied to the PDSCH reception. For example, a field corresponding to the above information (eg, TCI indication information) may not exist in the scheduling DCI. Alternatively, the size of the field corresponding to the information (eg, TCI indication information) in the scheduling DCI may be 0. In this case, the UE may apply the same TCI applied to reception of the scheduling DCI (or CORESET corresponding to the scheduling DCI) to the PDSCH reception operation. Alternatively, the terminal may determine one of the integrated TCI(s) applied to the PDSCH allocated section (e.g., slot) by the method described above, and receive the PDSCH based on the determined TCI. .

FIG. 10 is a conceptual diagram illustrating a second embodiment of a method for determining a TCI to be applied to a scheduled PDSCH.

Referring to FIG. 10, the terminal may receive scheduling information for PDSCH repetitive transmission consisting of the first PDSCH to the fourth PDSCH based on the first DCI. The first to fourth PDSCHs may include the same TB or correspond to the same HARQ process. Additionally, the base station can manage the beam of the terminal using the integrated TCI indication method described above. At this time, the first TCI set can be applied to the section (e.g., slot) to which the 1st PDSCH and the 2nd PDSCH are assigned, and to the section (e.g., slot) to which the 3rd PDSCH and the 4th PDSCH are assigned. A second TCI set may be applied. Each TCI set may include one or multiple (eg, two) integrated TCIs for downlink reception.

Referring to the drawing, T _offset,1, which is the scheduling offset of the first PDSCH, may be smaller than the reference value or threshold. In this case, the terminal can receive the first PDSCH based on the default TCI. For example, the default TCI may be a TCI included in the first TCI set (eg, the first TCI included in the first TCI set). At this time, several methods for the UE to receive the remaining PDSCHs can be considered.

In the first method, the PDSCH repetitive transmission can be configured to be received based on one TCI, regardless of the number of integrated TCI(s) indicated. In this case, the UE can apply a common TCI to all PDSCHs that constitute repetitive transmission. In the above embodiment, the terminal may apply the same default TCI used for reception of the first PDSCH to reception of the second, third, and fourth PDSCH. Accordingly, the application time of the second TCI set may be delayed from the originally indicated application time (eg, t1). For example, the application time of the second TCI set may be changed to a time after the fourth PDSCH resource.

In the second method, the UE can determine the TCI to apply to PDSCHs for each TCI section. For example, any TCI belonging to the first TCI set may be applied to the second PDSCH. Additionally, any TCI belonging to the second TCI set may be applied to the third PDSCH and fourth PDSCH. The scheduling offset of the PDSCHs may be greater than or equal to a reference value. Whether to apply default TCI according to scheduling offset can be determined individually for each PDSCH (or each PDSCH instance). One of the TCIs may be a TCI separately indicated by the first DCI by the method described above. In a similar way, the TCI can be determined for each TCI section, and the same TCI can be applied to all PDSCHs within each TCI section. According to this, the default TCI used in the first PDSCH reception operation can be equally applied to the second PDSCH reception operation. The TCI of the third and fourth PDSCH can be determined in the same manner as described above.

On the other hand, the PDSCH repetitive transmission may be configured to be received based on a plurality of TCIs (eg, two TCIs or a maximum of two TCIs). In the above embodiment, two integrated TCIs can be applied to the reception operation of the four PDSCHs. For example, two TCIs can be interlaced and applied to PDSCHs. The first TCI (or second TCI) may be applied to the first PDSCH and the third PDSCH, and the second TCI (or first TCI) may be applied to the second PDSCH and fourth PDSCH. The first TCI and the second TCI may be integrated TCIs indicated in the slot to which the first PDSCH, which is the first PDSCH, is allocated. In other words, the first TCI and the second TCI may be included in the first TCI set. For example, the first TCI and the second TCI may be the first TCI and the second TCI belonging to the first TCI set, respectively. The above-described TCI mapping rules may be predefined in technical specifications. Alternatively, the above-described TCI mapping rules may be set in the terminal by the base station.

According to the TCI mapping rules, default TCI may be applied to some PDSCHs. For example, a default TCI may be applied to PDSCH(s) with a scheduling offset less than a reference value. A method of applying TCI determined by a mapping rule can be used to PDSCH(s) with a scheduling offset that is not smaller than the reference value. In the above embodiment, the scheduling offset of the first PDSCH may be smaller than the reference value, and the default TCI may be applied to the first PDSCH. The scheduling offset of the remaining PDSCHs may be greater than or equal to the reference value, and TCIs according to the above-mentioned rules may be mapped to the remaining PDSCHs. Alternatively, the default TCI mapped to the first PDSCH may also be cross-mapped to other PDSCH(s). For example, the default TCI may be applied to the first PDSCH and the third PDSCH, and the second TCI (or first TCI) may be applied to the second PDSCH and the fourth PDSCH. According to the above-described method, the multiple TRP-based PDSCH transmission method can be maintained even when the default TCI is applied to some PDSCHs.

Even when the PDSCH repetitive transmission is set to be received based on a plurality of TCIs, the terminal can determine the TCI to apply to the PDSCHs for each TCI section. In the above embodiment, the first TCI set may be applied to the first PDSCH and the second PDSCH, and the second TCI set may be applied to the third PDSCH and the fourth PDSCH. For example, the first TCI and the second TCI may be applied to the first PDSCH and the second PDSCH, and the third TCI and fourth TCI may be applied to the third PDSCH and the fourth PDSCH. The third TCI and fourth TCI may be TCIs belonging to the second TCI set. For example, the third TCI and the fourth TCI may be the first and second TCIs belonging to the second TCI set, respectively. Even in this case, as in the above-described method, the default TCI may be exceptionally applied to the PDSCH that satisfies predetermined conditions. The above-described cross-mapping rules between TCIs and PDSCHs within each TCI interval can be applied.

FIG. 11 is a conceptual diagram illustrating a third embodiment of a method for determining a TCI to be applied to a scheduled PDSCH.

Referring to FIG. 11, the terminal may receive scheduling information for PDSCH repetitive transmission consisting of the first PDSCH to the sixth PDSCH based on the first DCI. Additionally, the terminal can receive integrated TCI from the base station using the method described above. In the section to which the first and second PDSCHs are allocated, a first TCI set including the first TCI and the second TCI may be indicated, and in the section to which the third to fifth PDSCHs are allocated, the third TCI and the fourth TCI may be indicated. A second TCI set including the 5th TCI and the 6th TCI may be indicated in the section to which the 6th PDSCH is allocated. The first TCI, third TCI, and fifth TCI may be the first TCI of each TCI set, and the second TCI, fourth TCI, and sixth TCI may be the second TCI of each TCI set. In the section where the PDSCH repetitive transmission is mapped, a TCI switching operation from the first TCI set to the second TCI set and a TCI switching operation from the second TCI set to the third TCI set may be indicated. In other words, two TCI switching operations may be instructed to the terminal in the section to which the PDSCH repetitive transmission is mapped.

By the above-described method, the integrated TCI indicated in the corresponding TCI section can be applied to each PDSCH. The first TCI and/or the second TCI may be applied to the first PDSCH and the second PDSCH belonging to the TCI interval in which the first TCI set is indicated, and the third to fifth PDSCHs belonging to the TCI interval in which the second TCI set is indicated. The third TCI and/or fourth TCI may be applied to the PDSCH, and the fifth TCI and/or sixth TCI may be applied to the sixth PDSCH belonging to the TCI section in which the third TCI set is indicated. Specifically, the 1st TCI, which is the first TCI of the first TCI set, may be applied to the 1st PDSCH, which is the first PDSCH of the TCI section in which the 1st TCI set is indicated, and the 2nd PDSCH, which is the following PDSCH in the corresponding TCI section, can be applied. The second TCI, which is the second TCI of the first TCI set, may be applied according to the TCI cross mapping rule. In addition, the 3rd TCI, which is the first TCI of the 2nd TCI set, can be applied to the 3rd PDSCH, which is the first PDSCH of the TCI section in which the 2nd TCI set is indicated, and the 4th PDSCH, which is the following PDSCH in the corresponding TCI section, can be applied. The fourth TCI, which is the second TCI of the second TCI set, may be applied according to the cross-mapping rule, and the fourth TCI, which is the first TCI of the second TCI set, may be applied to the fifth PDSCH, which is the following PDSCH in the corresponding TCI section, according to the TCI cross-mapping rule. 3 TCI may be applied. Lastly, the 5th TCI, which is the first TCI of the 3rd TCI set, can be applied to the 6th PDSCH, which is the first PDSCH of the TCI section in which the 3rd TCI set is indicated.

In the above embodiments, some PDSCHs among PDSCHs constituting repeated transmission may be dropped. In other words, the UE may not receive some of the PDSCHs that constitute repetitive transmission. Dropping of some of the PDSCHs may not affect TCI mapping to the remaining PDSCH(s) that were not dropped. The rules for mapping TCI(s) to PDSCHs constituting repetitive transmission may be unrelated to whether some PDSCHs are dropped. In other words, TCI mapping to each PDSCH may be performed based on nominally scheduled PDSCHs rather than actually received PDSCHs.

In the present disclosure, “indicated TCI” may mean any one of TCIs (or TCI pool) configured in the terminal or TCI(s) activated in the terminal. A TCI pool may refer to a set of candidate TCIs and may be divided into a downlink TCI pool and an uplink TCI pool, and a TCI pool (e.g., a downlink TCI pool and an uplink TCI pool) may be set in the terminal. there is. Alternatively, a joint downlink/uplink TCI pool (hereinafter referred to as “joint TCI pool”) may be set in the terminal. Candidate TCIs belonging to the joint TCI pool can be applied to both downlink reception and uplink transmission. The TCI pool can be reset by RRC signaling, and the set of active TCI(s) can be changed by MAC CE. Considering the above operation, the TCI indicated by the DCI may be one of the TCIs valid or activated in the corresponding slot.

Meanwhile, transmission based on multiple TCIs may be set or scheduled in a section where a single integrated TCI is indicated. For example, repetitive PDSCH transmission may be scheduled in a section where the first integrated TCI is indicated, and the repetitive PDSCH transmission may be configured to be received based on a plurality of TCIs. The PDSCH repetitive transmission may be a semi-permanently scheduled PDSCH (eg, SPS PDSCH). In this case, the transmission (i.e., PDSCH repetitive transmission) may be received based on the first integrated TCI, which is the TCI indicated in the interval in which the transmission is scheduled, rather than a plurality of TCIs. The same TCI (eg, first integrated TCI) may be applied to all transmission instances (eg, all PDSCH instances) that constitute repetitive transmission (eg, PDSCH repetitive transmission). Alternatively, even though the transmission is scheduled in a single TCI interval, the transmission may exceptionally be received based on a plurality of TCIs configured for the transmission. Alternatively, the transmission may be received based on one TCI among a plurality of TCIs set for the transmission.

(Method 200) can be generalized to consider multiple TRP transmissions. Two TCI sets may be indicated to the terminal by the same DCI (eg, scheduling DCI). The two TCI sets may include a first TCI set and a second TCI set. The first TCI set may include integrated TCI(s) indicated to the terminal. The second TCI set may include TCI(s) applied to PDSCH, CSI-RS, PUSCH, PUCCH, SRS, etc. scheduled by the DCI. The number of TCI(s) included in the first TCI set and the second TCI set may be the same or different. The first TCI set and the second TCI set may be indicated by one DCI field. Alternatively, the first TCI set and the second TCI set may be indicated by different DCI fields.

The above-described method can increase the degree of freedom of TCI control, but may have the disadvantage of increasing the DCI payload size. As another way to reduce DCI overhead, multiple TCI modes can be defined. For example, the first TCI mode is the integrated TCI(s) (e.g., first TCI set) indicated in the time interval (e.g., slot(s)) to which the signal scheduled by DCI is assigned. ) may mean a receiving (or transmitting) mode based on . The second TCI mode may mean a mode in which the signal scheduled by DCI is received (or transmitted) based on TCI(s) (e.g., a second TCI set) specifically indicated to the DCI. . The base station can select one of a plurality of TCI modes and indicate the selected TCI mode to the terminal through the DCI. In other words, the DCI may include information (or field) indicating the TCI mode. For another example, the first TCI mode may be a mode in which the terminal receives (or transmits) a scheduled signal based on a single TCI, and the second TCI mode may be a mode in which the terminal receives (or transmits) a scheduled signal based on multiple TCIs. It may be a receiving (or transmitting) mode. For another example, the reception (or transmission) operation of the terminal corresponding to the first TCI mode and the second TCI mode, respectively, may be defined based on configuration information received from the base station. Here, “TCI mode” may be a convenient term for defining operations related to different TCIs.

Figure 12 is a conceptual diagram showing a first embodiment of a method of applying TCI to CORESET in a multi-integrated TCI section.

Referring to FIG. 12, the terminal can receive integrated TCI(s) through DCI. In other words, the DCI can indicate integrated TCI(s) to the terminal. Additionally, the terminal can receive configuration information for the first CORESET, the second CORESET, and the third CORESET, and can perform a PDCCH monitoring operation on the CORESETs that are periodically repeated. Each CORESET shown in the drawing may mean a set of search spaces belonging to CORESET or a PDCCH monitoring location corresponding to CORESET.

The first CORESET and the second CORESET may be correlated for repeated PDCCH transmission. Specifically, the first search space set belonging to the first CORESET and the second search space set belonging to the second CORESET may be set to be linked to each other, and the PDCCH candidate(s) belonging to the first search space set and the second search space set may be set to be linked to each other. PDCCH candidate(s) belonging to the search space set may be connected to each other by a one-to-one correspondence relationship. The PDCCH may be repeatedly transmitted in a plurality of connected PDCCH candidates (eg, a first PDCCH candidate belonging to the first search space set and a second PDCCH candidate belonging to the second search space set).

The resources of the first PDCCH candidate and the resources of the second PDCCH candidate that are connected to each other may belong to the same integrated TCI interval. For example, the integrated TCI section may belong to the section in which the first downlink TCI is indicated (eg, the section before t1). In this case, the UE may monitor the first PDCCH candidate and the second PDCCH candidate based on the same integrated TCI (eg, first downlink TCI). In other words, PDCCH repeat transmissions can be transmitted from a single TRP based on a single TCI. The above operation can be performed regardless of the TCI set in the first CORESET and the second CORESET, respectively. For another example, the resources of the first PDCCH candidate and the resources of the second PDCCH candidate that are connected to each other are connected to the section in which multiple integrated TCIs (e.g., the second downlink TCI and the third downlink TCI) are indicated (i.e., t1 and t2). In this case, the UE uses each of the first PDCCH candidate and the second PDCCH candidate in the same plurality of integrated TCIs (e.g., “the second downlink TCI and the third downlink TCI” or “the third downlink TCI and the second downlink TCI”). It can be monitored based on “downlink TCI”). In other words, PDCCH repetitive transmission can be transmitted from two TRPs based on two TCIs. The above operation can also be performed regardless of the TCI set in the first CORESET and the second CORESET, respectively.

The two TCIs may each be mapped to two PDCCH candidates constituting repetitive PDCCH transmission based on predefined rules. The mapping may be determined based on the ID of the CORESET, search space set, etc. corresponding to the PDCCH candidate. For example, among the indicated integrated TCIs, the first TCI may be mapped to a PDCCH candidate corresponding to a CORESET, search space set, etc. with a lower ID (or higher ID) among the two PDCCH candidates, and the second TCI may be mapped to the remaining PDCCH candidates. It can be mapped to a PDCCH candidate. Alternatively, the mapping may be determined based on the time resource arrangement order of PDCCH candidates. For example, among the indicated integrated TCIs, the first TCI may be mapped to a PDCCH candidate with an earlier (or not later) start symbol, and the second TCI may be mapped to the remaining PDCCH candidates. For another example, among the indicated integrated TCIs, the first TCI may be mapped to a PDCCH candidate with an earlier (or not later) termination symbol, and the second TCI may be mapped to the remaining PDCCH candidates.

Alternatively, the resources of the first PDCCH candidate and the resources of the second PDCCH candidate that are connected to each other may belong to different integrated TCI sections. In the above embodiment, the first CORESET and the second CORESET that are associated with each other may belong to a multiple integrated TCI section before t2 and a single integrated TCI section after t2, respectively. In this case, the TCI(s) indicated in the TCI section to which it belongs may be applied to each PDCCH candidate corresponding to each CORESET. In other words, the first PDCCH candidate may be monitored based on the second downlink TCI and/or the third downlink TCI, and the second PDCCH candidate may be monitored based on the fourth downlink TCI. Alternatively, the UE may not expect that interconnected PDCCH candidates belong to different integrated TCI sections as in the above-described method. Alternatively, the terminal may not expect to receive an integrated TCI indication resulting in the above result.

In the above embodiment, the third CORESET may be a CORESET that does not participate in PDCCH repeated transmission. In this case, the indicated single integrated TCI may be applied to the third CORESET belonging to the section for which the single integrated TCI is indicated. On the other hand, in the 3rd CORESET belonging to the interval in which the multiple integrated TCIs are indicated (e.g., the interval between t1 and t2), one TCI (e.g., the second downlink TCI or the third downlink TCI) among the indicated multiple integrated TCIs is included. Link TCI) may be applied. The one TCI may refer to the default TCI described above, and may be selected through the operation of determining the default TCI described above. Alternatively, the one TCI may be selected based on the ID of the CORESET (or the ID of the search space set on which the monitoring operation is to be performed).

The proposed integrated TCI indication method can be applied differently for each CORESET type. For example, a CORESET is a search space set for receiving a UE-specific PDCCH (or unicast PDCCH) and/or a PDSCH (or unicast PDSCH) corresponding to a UE-specific PDCCH (or unicast PDCCH). It can only include In other words, a CORESET may contain only a USS set and/or a specific CSS set (e.g., a type 3 CSS set). The CORESET may be referred to as a first type CORESET. The terminal may monitor the first type CORESET and the search space set corresponding to the first type CORESET based on the indicated integrated TCI. On the other hand, some CORESETs only include a set of search spaces for reception of a common PDCCH (or PDCCH for broadcast or multicast) and/or a PDSCH corresponding to a common PDCCH (or broadcast PDSCH, multicast PDSCH). can do. In other words, some CORESETs may not contain USS sets or certain CSS sets (e.g., type 3 CSS sets). The CORESET may include type 0, 0A, 1, 2 CSS sets, etc. The CORESET may be referred to as a second type CORESET. The terminal may not apply the integrated TCI indicated in the second type CORESET, and monitors the second type CORESET and the search space set corresponding to the second type CORESET based on the TCI separately set or indicated for the second type CORESET. can do. Additionally, a certain CORESET may include both a search space set corresponding to the first type CORESET and a search space set corresponding to the second type CORESET. For example, a CORESET may contain a USS set and a type 0 CSS set. The CORESET may be referred to as a third type CORESET. The base station can configure the terminal through a signaling procedure whether to apply integrated TCI to monitoring of type 3 CORESET. In this case, depending on the settings of the base station, the terminal can receive the third type CORESET based on the integrated TCI or a separately configured TCI. The method applied to the third type CORESET can be equally applied to a CORESET with CORESET ID 0 (eg, CORESET 0).

Meanwhile, when multiple CORESET pools are set in the terminal, integrated TCI may be indicated for each CORESET pool. For example, the first downlink TCI and the second downlink TCI may be indicated to the terminal by DCI, and the first downlink TCI and the second downlink TCI are the first CORESET pool and the second CORESET pool set in the terminal. Can be applied to each. In the section where the multiple integrated TCIs are applied, the terminal can receive CORESET(s) belonging to the first CORESET pool based on the first downlink TCI, and receive CORESET(s) belonging to the second CORESET pool as the second downlink TCI. It can be received based on link TCI. The timing at which the multiple integrated TCIs are applied to CORESET pools may be determined the same or different from each other by the method described above. The first CORESET pool and the second CORESET pool may correspond to the CORESET pool with ID=0 and the CORESET pool with ID=1, respectively.

Alternatively, the terminal may apply the integrated TCI indicated by the DCI received from the CORESET belonging to the first CORESET pool to the reception or transmission of a signal associated with the first CORESET pool. The signal associated with the first CORESET pool is a signal scheduled by CORESETs belonging to the first CORESET pool, search space sets corresponding to the CORESETs, and a PDCCH transmitted in the search space sets (e.g., PDSCH, PUSCH, PUCCH, CSI-RS, SRS), etc. The integrated TCI may not be applied to the reception or transmission of signals associated with the second CORESET pool. Likewise, the terminal may apply the integrated TCI indicated by the DCI received from the CORESET belonging to the second CORESET pool to the reception or transmission of a signal associated with the second CORESET pool. The integrated TCI may not apply to reception or transmission of signals associated with the first CORESET pool.

A CORESET pool may include both CORESETs to which integrated TCI is applied and CORESETs to which integrated TCI is not applied (e.g., CORESETs to which TCI set separately for CORESET is applied). For example, a first CORESET pool may include a first type CORESET and a second type CORESET. For another example, the first CORESET pool may include a first type CORESET and CORESET 0, and CORESET 0 may be set so that the integrated TCI is not applied. In this case, different TCIs may be applied to multiple CORESETs constituting the first CORESET pool.

Figure 13 is a conceptual diagram showing a first embodiment of a PDCCH monitoring method using a plurality of TCIs in the CORESET pool.

Referring to FIG. 13, the terminal may receive configuration information of a plurality of CORESET pools (eg, a first CORESET pool and a second CORESET pool) from the base station. Each CORESET pool can correspond to each TRP. For example, the first CORESET pool and the second CORESET pool may correspond to the first TRP and the second TRP, respectively. The first CORESET pool may include the first CORESET and the second CORESET, and the second CORESET pool may include the third CORESET and the fourth CORESET.

By the above-described method, the terminal can apply different TCIs to monitoring multiple CORESETs constituting the same CORESET pool. Referring to FIG. 13, the terminal can apply the first TCI and the second TCI to monitoring the first CORESET and the second CORESET, respectively. For example, the first TCI may be an integrated TCI and the first CORESET may be a first type CORESET. The second TCI may be a TCI set separately for the second CORESET, and the second CORESET may be a second type CORESET. The terminal can apply the 3rd TCI and 4th TCI to monitoring the 3rd CORESET and 4th CORESET, respectively. The third TCI may be an integrated TCI, and the third CORESET may be a first type CORESET. The fourth TCI may be a TCI set separately for the fourth CORESET, and the fourth CORESET may be a second type CORESET. At this time, multiple TCIs applied to CORESETs belonging to the same CORESET pool may correspond to the same PCI (physical cell ID). The QCL source signal of the first TCI and the QCL source signal of the second TCI may be transmitted from the same serving cell. In other words, the PCI of the source signal included in the configuration information of the first TCI state may match the PCI of the source signal included in the configuration information of the second TCI state. Due to the above constraints, PDCCHs transmitted from a plurality of serving cells can be monitored in different CORESET pools.

Meanwhile, as described above, integrated TCI may not be applied to the PDSCH reception operation. The TCI of the PDSCH may be indicated by the DCI that schedules the PDSCH separately from the integrated TCI. At this time, if the scheduling offset of the PDSCH is smaller than the reference value, the reception operation of the PDSCH may be performed based on the default TCI. The terminal may regard the TCI of a specific CORESET set to the terminal as the default TCI. For example, the terminal receives the PDSCH using the TCI of any one of the CORESET(s) mapped to the latest slot to which the CORESET is mapped (e.g., the CORESET with the lowest index or ID). It can be considered a TCI for

The above-described method can be modified by considering the CORESET type. For example, in the determination procedure of the default TCI, CORESETs to which integrated TCI is not applied (eg, second type CORESET) and/or CORESETs set to not apply integrated TCI may be considered. The terminal may first select a CORESET(s) to which integrated TCI is not applied among the CORESET(s) mapped to the latest slot to which the CORESET is mapped, and select any one of the selected CORESET(s) (e.g. For example, the TCI (CORESET) with the lowest index or ID can be regarded as the TCI for receiving the PDSCH. As another example, in the default TCI determination procedure, CORESETs to which integrated TCI is applied (eg, first type CORESET) and/or CORESETs set to apply integrated TCI may be considered. The terminal can first select the CORESET(s) to which the integrated TCI is applied among the CORESET(s) mapped to the most recent slot to which the CORESET is mapped, and select any one of the selected CORESET(s) (e.g., the most recent slot). A TCI (CORESET) with a low index or ID can be regarded as a TCI for receiving the PDSCH. As another example, all types of CORESETs may be considered in the default TCI determination procedure. The terminal may consider the TCI of any one CORESET (e.g., the CORESET with the lowest index or ID) among all CORESET(s) mapped to the most recent slot to which the CORESET is mapped as the TCI for receiving the PDSCH. there is.

When a plurality of CORESET pools are set in the terminal, the operation of determining the default TCI of the PDSCH can be performed for each CORESET pool. For example, in the case of a PDSCH scheduled through the first CORESET pool, the terminal applies the integrated TCI among the CORESET(s) belonging to the first CORESET pool mapped to the most recent slot to which the CORESET belonging to the first CORESET pool is mapped. CORESET(s) that are not available can be selected, and the TCI of any one CORESET (e.g., CORESET with the lowest index or ID) of the selected CORESET(s) can be regarded as the TCI for receiving the PDSCH. . Alternatively, the terminal may select the CORESET(s) to which the integrated TCI is applied among the CORESET(s) belonging to the first CORESET pool mapped to the most recent slot to which the CORESET belonging to the first CORESET pool is mapped, and the selected CORESET(s) ( The TCI of one of the CORESETs (e.g., the CORESET with the lowest index or ID) may be regarded as the TCI for receiving the PDSCH. Alternatively, the terminal may select any one CORESET (e.g., the CORESET with the lowest index or ID) among all CORESET(s) belonging to the first CORESET pool mapped to the most recent slot to which the CORESET belonging to the first CORESET pool is mapped. ) can be regarded as the TCI for receiving the PDSCH.

The terminal can use the default TCI determined by the above-described method not only as a TCI for reception of PDSCH, but also as “TCI for reception of CSI-RS” or “TCI for transmission of PUCCH, PUSCH, SRS, etc.”

Meanwhile, if the quality of all beams of the downlink control channel or beams corresponding to the downlink control channel deteriorates below the reference value, the terminal may determine beam failure and initiate a beam recovery procedure. . For the above operation, the base station may set reference signal(s) for beam failure detection to the terminal by an explicit signaling method or an implicit signaling method. The reference signal for detecting beam failure may be referred to as beam failure detection (BFD)-RS, and a set of BFD-RSs may be referred to as q0. In the case of the implicit signaling method, the UE may regard the QCL source signal(s) having a QCL relationship with the CORESET(s) set to the terminal as a BFD-RS, and q0 may include the QCL source signal(s). there is.

When the integrated TCI indication method is used, the CORESET type can be considered as a criterion for the terminal to determine beam failure. When a BFD-RS set (e.g., q0) is determined by an implicit signaling method, the UE may include only the QCL source signal(s) of CORESET(s) with a specific type in q0, and other CORESET(s) The QCL source signal(s) of (s) may not be included in q0. In other words, beams of the other CORESET(s) may be excluded from the beam failure determination factor. For example, q0 may consist of only the DM-RS or QCL source signal of CORESET(s) to which integrated TCI is not applied, and may not include the DM-RS or QCL source signal of CORESET(s) to which integrated TCI is applied. . q0 may include a CORESET set to not apply the first type CORESET and/or integrated TCI, and may not include a CORESET set to apply the second type CORESET or integrated TCI. As another example, q0 may consist of only DM-RS or QCL source signals from CORESET(s) to which integrated TCI is applied, and may not include DM-RS or QCL source signals from CORESET(s) to which integrated TCI is not applied. there is. q0 may include a CORESET set to apply the second type CORESET and/or integrated TCI, and may not include a CORESET set to not apply the first type CORESET or integrated TCI. As another example, q0 may include the DM-RS or QCL source signals of all CORESET(s) (i.e., all types of CORESET(s)).

When a plurality of CORESET pools are set in the terminal, the above-described beam failure determination operation may be performed for each CORESET pool (eg, for each TRP). For example, when determining beam failure for the first CORESET pool (e.g., TRP corresponding to the first CORESET pool), the terminal determines which CORESETs to which the integrated TCI is not applied among the CORESETs belonging to the first CORESET pool. Only the DM-RS or QCL source signal of CORESET(s) may be included in q0, and the DM-RS or QCL source signal of CORESET to which the integrated TCI is applied may not be included in q0. Alternatively, in this case, the terminal may include in q0 only the DM-RS or QCL source signal of the CORESET(s) to which the integrated TCI is applied among the CORESETs belonging to the first CORESET pool, and the CORESET to which the integrated TCI is not applied. The DM-RS or QCL source signal of may not be included in q0. Alternatively, in this case, the terminal may include DM-RS or QCL source signals of all CORESET(s) belonging to the first CORESET pool in q0. If the beam quality (e.g., L1-RSRP, L1-SINR) of all signals included in q0 is below the reference value, the terminal is connected to the corresponding CORESET pool (e.g., 1st CORESET pool, 1st CORESET pool) Beam failure can be determined for the TRP). The terminal may transmit information about a new beam candidate for the first CORESET pool and/or information about beam failure to the base station through a signaling procedure (e.g., MAC CE) and perform a beam recovery request operation. .

Generalizing the above-described operation, when the CORESET pool includes CORESETs corresponding to a plurality of TCIs, the signal transmission operation or reception operation of the terminal associated with the CORESET pool will be performed based on any one TCI of the plurality of TCIs. You can. In other words, the reception operation of a downlink signal (e.g., PDSCH, CSI-RS) scheduled by a CORESET belonging to the CORESET pool is performed based on any one TCI among the plurality of TCIs corresponding to the CORESET pool. It can be. In addition, the transmission operation of an uplink signal (e.g., PUSCH, PUCCH, SRS) scheduled by a CORESET belonging to the CORESET pool will be performed based on any one TCI among the plurality of TCIs corresponding to the CORESET pool. You can. For convenience, any one of the TCIs may be referred to as a representative TCI. The operation of the terminal selecting a representative TCI may be performed based on priority rules between TCIs. For example, an integrated TCI may have a higher priority than a TCI set separately for a specific CORESET, and the integrated TCI may be selected as a representative TCI according to the priority condition. Conversely, a TCI set separately for a specific CORESET may have a higher priority than an integrated TCI, and a TCI set separately for a specific CORESET may be selected as a representative TCI according to the priority condition. Alternatively, the base station may inform the terminal of the representative TCI through a signaling procedure (eg, RRC signaling, MAC CE, DCI). Information about the representative TCI may be included in the setting information of the CORESET pool. The representative TCI may also be referred to as default TCI, basic TCI, etc.

The operation of the method according to the embodiment of the present disclosure can be implemented as a computer-readable program or code on a computer-readable recording medium. Computer-readable recording media include all types of recording devices that store information that can be read by a computer system. Additionally, computer-readable recording media can be distributed across networked computer systems so that computer-readable programs or codes can be stored and executed in a distributed manner.

Additionally, computer-readable recording media may include hardware devices specially configured to store and execute program instructions, such as ROM, RAM, or flash memory. Program instructions may include not only machine language code such as that created by a compiler, but also high-level language code that can be executed by a computer using an interpreter or the like.

Although some aspects of the disclosure have been described in the context of an apparatus, it may also refer to a corresponding method description, where a block or device corresponds to a method step or feature of a method step. Similarly, aspects described in the context of a method may also be represented by corresponding blocks or items or features of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as, for example, a microprocessor, programmable computer, or electronic circuit. In some embodiments, at least one or more of the most important method steps may be performed by such a device.

In embodiments, a programmable logic device (e.g., a field programmable gate array) may be used to perform some or all of the functionality of the methods described herein. In embodiments, a field-programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described herein. In general, it is desirable for the methods to be performed by some hardware device.

Although the present disclosure has been described above with reference to preferred embodiments, those skilled in the art may modify and change the present disclosure in various ways without departing from the spirit and scope of the present disclosure as set forth in the claims below. You will understand that it is possible.

Claims (20)

By terminal method,
Receiving first unified TCI information including a first transmission configuration indicator (TCI) and a second TCI from a base station;
A first downlink control (DCI) including first scheduling information of a first physical downlink shared channel (PDSCH) and information indicating at least one TCI of the first TCI and the second TCI belonging to the first integrated TCI information. receiving information) from the base station; and
Comprising performing a first reception operation for the first PDSCH based on the at least one TCI and the first scheduling information,
Terminal method. In claim 1,
The first DCI further includes second integrated TCI information including a third TCI and a fourth TCI,
Terminal method. In claim 2,
The at least one TCI and the second integrated TCI information are indicated by one field or different fields in the first DCI, and the first DCI contains information indicating an application point of the second integrated TCI information. Including more,
Terminal method. In claim 2,
The method of the terminal is,
Receiving a second DCI from the base station including second scheduling information of a second PDSCH and information indicating one or more TCIs of the third TCI and the fourth TCI belonging to the second integrated TCI information; and
Further comprising performing a second reception operation for the second PDSCH based on the one or more TCIs and the second scheduling information,
Terminal method. In claim 4,
The first PDSCH is scheduled within a first interval to which the first integrated TCI information is applied, and the second PDSCH is scheduled within a second interval to which the second integrated TCI information is applied.
Terminal method. In claim 1,
The method of the terminal is,
It further includes receiving information from the base station indicating performing a reception operation for downlink (DL) data based on a single TCI,
The first reception operation is performed based on one of the first TCI and the second TCI,
Terminal method. In claim 1,
If the terminal is not configured to perform a reception operation for DL data based on multiple TCIs, the first reception operation is performed based on one TCI of the first TCI and the second TCI,
Terminal method. By terminal method,
Receiving first unified TCI information including a first transmission configuration indicator (TCI) and a second TCI from a base station;
Receiving first downlink control information (DCI) including first scheduling information of a first physical downlink shared channel (PDSCH) from the base station;
selecting one of the first TCI and the second TCI based on a predefined rule; and
Comprising the step of performing a first reception operation for the first PDSCH based on the one TCI belonging to the first integrated TCI information and the first scheduling information,
Terminal method. In claim 8,
The predefined rule is to select the first TCI, the TCI with the lowest index, or the TCI with the highest index among the first TCI and the second TCI belonging to the first integrated TCI information.
Terminal method. In claim 8,
The predefined rule is to select a default TCI among the first TCI and the second TCI belonging to the first integrated TCI information when the scheduling offset between the first DCI and the first PDSCH is less than or equal to a reference value.
Terminal method. In claim 8,
“When information indicating performing a reception operation for DL (downlink) data based on a single TCI is received from the base station” or “Performing the reception operation for the DL data based on multiple TCIs” "If not set in the terminal", the first reception operation is performed based on the one TCI of the first TCI and the second TCI,
Terminal method. In claim 8,
The first DCI further includes second integrated TCI information including a third TCI and a fourth TCI,
Terminal method. In claim 12,
The method of the terminal is,
Receiving a second DCI including second scheduling information of a second PDSCH from the base station;
selecting one of the third TCI and the fourth TCI belonging to the second integrated TCI information indicated by the first DCI; and
Further comprising performing a second reception operation for the second PDSCH based on the one TCI belonging to the second integrated TCI information and the second scheduling information,
Terminal method. By way of a base station,
Transmitting first unified TCI information including a first transmission configuration indicator (TCI) and a second TCI to the terminal;
A first downlink control (DCI) including first scheduling information of a first physical downlink shared channel (PDSCH) and information indicating at least one TCI of the first TCI and the second TCI belonging to the first integrated TCI information. transmitting information) to the terminal; and
Comprising transmitting the first PDSCH to the terminal based on the at least one TCI and the first scheduling information,
Base station method. In claim 14,
The first DCI further includes second integrated TCI information including a third TCI and a fourth TCI,
Base station method. In claim 15,
The at least one TCI and the second integrated TCI information are indicated by one field or different fields in the first DCI, and the first DCI contains information indicating an application point of the second integrated TCI information. Including more,
Base station method. In claim 15,
The method of the base station is,
Transmitting to the terminal a second DCI including second scheduling information of a second PDSCH and information indicating one or more TCIs among the third TCI and the fourth TCI belonging to the second integrated TCI information; and
Further comprising transmitting the second PDSCH to the terminal based on the one or more TCIs and the second scheduling information,
Base station method. In claim 17,
The first PDSCH is scheduled within a first interval to which the first integrated TCI information is applied, and the second PDSCH is scheduled within a second interval to which the second integrated TCI information is applied.
Base station method. In claim 14,
The method of the base station is,
Further comprising transmitting to the terminal information instructing to perform a reception operation for downlink (DL) data based on a single TCI,
The first PDSCH is transmitted based on one TCI of the first TCI and the second TCI,
Base station method. In claim 14,
If the terminal is not configured to perform a reception operation for DL data based on multiple TCIs, the first PDSCH is transmitted based on one TCI of the first TCI and the second TCI,
Base station method.

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