Method and device for allocating control resource in wireless communication system

Abstract

A method of a terminal, according to one embodiment of the present disclosure, may comprise the steps of: receiving first control information through a CORESET in a BWP allocated from a base station; receiving ADRAI indicating the extension of the CORESET from the base station through an ADRAI resource; receiving second control information from the base station through an extended CORESET on the basis of the ADRAI; and receiving data from the base station on the basis of the first control information and the second control information.

Description

Method and device for allocating control resources in a wireless communication system

[0001] The present disclosure relates to a resource allocation technique in a wireless communication system, and more particularly, to a control resource allocation technique in a wireless communication system.

[0002] In wireless cellular communication systems, link adaptation techniques are used to ensure reliable and high-speed data transmission, taking into account the radio channel conditions between each terminal and the base station. To support link adaptation, the base station transmits control information for data reception, such as radio resource allocation information (frequency and time-domain resources) and modulation and coding level information, to each terminal.

[0003] An example of a wireless cellular system is the Long Term Evolution (LTE) system. In an LTE system, the amount of physical downlink control channel (PDCCH) resources that must be transmitted in each subframe can vary depending on factors such as the number of terminals and the amount of data transmitted. Therefore, an LTE base station can transmit a Physical Control Format Indicator Channel (PCFICH) for each subframe, indicating the time-domain of the PDCCH.

[0004] Another example of a wireless cellular system is the New Radio (NR) system. In an NR system, a base station can transmit PDCCHs within a bandwidth part (BWP) and a control resource set (CORESET) within a slot, depending on factors such as the number of terminals and the amount of data transmitted.

[0005] In the LTE and NR wireless cellular systems exemplified above, resources transmitting control information may be transmitted within a predefined area. This can limit the flexibility of the wireless cellular system.

[0006] The purpose of the present disclosure to address the above-mentioned needs is to provide a method and device capable of flexibly allocating control resources in a wireless communication system.

[0007] According to one embodiment of the disclosure for achieving the above object, a method of a terminal may include: receiving first control information through a control resource set (CORESET) resource within a bandwidth part (BWP) allocated from a base station; receiving additional dynamic resource allocation information (ADRAI) indicating an extension of the CORESET from the base station through the ADRAI resource; receiving second control information from the base station through an extended CORESET based on the ADRAI; and receiving data from the base station based on the first control information and the second control information.

[0008] The above ADRAI resources are:

[0009] It may be a resource of a first orthogonal frequency division multiplexing (OFDM) symbol interval among the CORESET on the time axis, and a resource of one resource element group (REG) other than the CORESET among the frequency resources that are most adjacent to a subcarrier having the lowest index of the CORESET on the frequency axis, or it may be a resource of a first OFDM symbol interval among the CORESET on the time axis, and a resource of one REG other than the CORESET among the frequency resources that are most adjacent to a subcarrier having the highest index of the CORESET frequency resources on the frequency axis.

[0010] The above ADRAI resources are:

[0011] It may be configured with a first resource element group (REG) that is not a CORESET among the frequency resources that are most adjacent to a subcarrier having the lowest index of the CORESET in the frequency axis, which is a resource of the first orthogonal frequency division multiplexing (OFDM) symbol interval among the CORESET in the time axis, and a second REG that is most adjacent to the first REG among the REGs that are not a CORESET, or it may be configured with a third REG that is not a CORESET among the frequency resources that are most adjacent to a subcarrier having the highest index of the CORESET frequency resources in the time axis, and a fourth REG that is most adjacent to the third REG among the REGs that are not a CORESET.

[0012] The above extended CORESET may be composed of one or more orthogonal frequency division multiplexing (OFDM) symbols consecutive to the CORESET.

[0013] The above extended CORESET can be transmitted at a location spaced apart from the CORESET by a preset number of orthogonal frequency division multiplexing (OFDM) symbols.

[0014] The above extended CORESET can be indicated by the ADRAI in units of the number of orthogonal frequency division multiplexing (OFDM) symbols.

[0015] At least some of the second control information may be repeated information of the first control information.

[0016] A terminal according to one embodiment of the present disclosure comprises at least one processor, wherein the at least one processor comprises:

[0017] The method may cause a base station to receive first control information through a control resource set (CORESET) resource within a bandwidth part (BWP) allocated from the base station; receive additional dynamic resource allocation information (ADRAI) indicating an extension of the CORESET from the base station through an ADRAI resource; receive second control information from the base station through an extended CORESET based on the ADRAI; and receive data from the base station based on the first control information and the second control information.

[0018] The above ADRAI resources are:

[0019] It may be a resource of a first orthogonal frequency division multiplexing (OFDM) symbol interval among the CORESET on the time axis, and a resource of one resource element group (REG) other than the CORESET among the frequency resources that are most adjacent to a subcarrier having the lowest index of the CORESET on the frequency axis, or it may be a resource of a first OFDM symbol interval among the CORESET on the time axis, and a resource of one REG other than the CORESET among the frequency resources that are most adjacent to a subcarrier having the highest index of the CORESET frequency resources on the frequency axis.

[0020] The above ADRAI resources are:

[0021] It may be configured with a first resource element group (REG) that is not a CORESET among the frequency resources that are most adjacent to a subcarrier having the lowest index of the CORESET in the frequency axis, which is a resource of the first orthogonal frequency division multiplexing (OFDM) symbol interval among the CORESET in the time axis, and a second REG that is most adjacent to the first REG among the REGs that are not a CORESET, or it may be configured with a third REG that is not a CORESET among the frequency resources that are most adjacent to a subcarrier having the highest index of the CORESET frequency resources in the time axis, and a fourth REG that is most adjacent to the third REG among the REGs that are not a CORESET.

[0022] The above extended CORESET may be composed of one or more orthogonal frequency division multiplexing (OFDM) symbols consecutive to the CORESET.

[0023] The above extended CORESET can be transmitted at a location spaced apart from the CORESET by a preset number of orthogonal frequency division multiplexing (OFDM) symbols.

[0024] The above extended CORESET can be indicated by the ADRAI in units of the number of orthogonal frequency division multiplexing (OFDM) symbols.

[0025] At least some of the second control information may be repeated information of the first control information.

[0026] A method of a base station according to one embodiment of the present disclosure may include: transmitting first control information to a terminal through a control resource set (CORESET) resource within a bandwidth part (BWP) allocated to the terminal; transmitting additional dynamic resource allocation information (ADRAI) indicating an extension of the CORESET to the terminal through the ADRAI resource when an extension of the CORESET is required; transmitting second control information to the terminal through an extended CORESET based on the ADRAI; and transmitting data to the terminal based on the first control information and the second control information.

[0027] The above ADRAI resources are:

[0028] It may be a resource of a first orthogonal frequency division multiplexing (OFDM) symbol interval among the CORESET on the time axis, and a resource of one resource element group (REG) other than the CORESET among the frequency resources that are most adjacent to a subcarrier having the lowest index of the CORESET on the frequency axis, or it may be a resource of a first OFDM symbol interval among the CORESET on the time axis, and a resource of one REG other than the CORESET among the frequency resources that are most adjacent to a subcarrier having the highest index of the CORESET frequency resources on the frequency axis.

[0029] The above ADRAI resources are:

[0030] It may be configured with a first resource element group (REG) that is not a CORESET among the frequency resources that are most adjacent to a subcarrier having the lowest index of the CORESET in the frequency axis, which is a resource of the first orthogonal frequency division multiplexing (OFDM) symbol interval among the CORESET in the time axis, and a second REG that is most adjacent to the first REG among the REGs that are not a CORESET, or it may be configured with a third REG that is not a CORESET among the frequency resources that are most adjacent to a subcarrier having the highest index of the CORESET frequency resources in the time axis, and a fourth REG that is most adjacent to the third REG among the REGs that are not a CORESET.

[0031] The above extended CORESET may be composed of one or more orthogonal frequency division multiplexing (OFDM) symbols consecutive to the CORESET.

[0032] The above extended CORESET can be indicated by the ADRAI in units of the number of orthogonal frequency division multiplexing (OFDM) symbols.

[0033] At least some of the second control information may be repeated information of the first control information.

[0034] According to one embodiment of the present disclosure, a base station can extend a CORESET if necessary. This can reduce the error rate of data transmitted via the CORESET. Furthermore, when coverage is expanded, the base station can extend the CORESET appropriately to accommodate the expanded coverage. Furthermore, the base station can indicate that control information is transmitted via the extended CORESET. Therefore, a terminal can benefit from obtaining control information via the extended CORESET.

[0035] Figure 1 is a conceptual diagram illustrating one embodiment of a communication system.

[0036] Figure 2 is a block diagram illustrating one embodiment of a communication node constituting a communication system.

[0037] Figure 3a is a conceptual diagram for explaining the channel configuration of the physical layer in an LTE system.

[0038] Figure 3b is a conceptual diagram for explaining the channel configuration of the physical layer in a 5G NR system.

[0039] Figure 4a is a conceptual diagram illustrating the configuration of one subframe composed of six physical resource blocks in an LTE system.

[0040] FIG. 4b is a conceptual diagram illustrating the configuration of a physical layer channel when subframe #1 is transmitted through PRB #0 and PRB #1 illustrated in FIG. 4a.

[0041] FIG. 4c is a conceptual diagram illustrating the configuration of a physical layer channel when subframe #1 is transmitted through PRB #4 and PRB #5 illustrated in FIG. 4a.

[0042] Figure 5 is a conceptual diagram illustrating a case where CORESET is set within one BWP in the NR system.

[0043] Figure 6 is a conceptual diagram for explaining the transmission of information indicating whether to expand a CORESET area using one REG in one BWP and the case where CORESET is expanded.

[0044] Figure 7 is a conceptual diagram for explaining the transmission of information indicating whether to expand the CORESET area using two REGs in one BWP and the case where CORESET is expanded.

[0045] Figure 8 is another conceptual diagram for explaining the transmission of information indicating whether to expand the CORESET area using two REGs in one BWP and the case where the CORESET is expanded.

[0046] Figure 9 is another conceptual diagram for explaining the transmission of information indicating whether to expand the CORESET area using two REGs in one BWP and the case where the CORESET is expanded.

[0047] Figure 10 is another conceptual diagram for explaining the transmission of information indicating whether to expand the CORESET area using two REGs in one BWP and the case where the CORESET is expanded.

[0048] Figure 11 is a flowchart explaining a case where a base station provides CORESET setting information to a terminal.

[0049] This disclosure may be subject to various modifications and various embodiments. Specific embodiments are illustrated and described in detail in the drawings. However, this is not intended to limit the disclosure to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the disclosure.

[0050] While terms such as "first" and "second" may be used to describe various components, these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present disclosure, a first component could be referred to as a "second component," and similarly, a second component could also be referred to as a "first component." The term "and / or" includes a combination of multiple related items described herein or any of multiple related items described herein.

[0051] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0052] The terminology used in this disclosure is only used to describe specific embodiments and is not intended to limit the present disclosure. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this disclosure, it should be understood that the terms "comprises" or "has" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0053] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which this disclosure pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and shall not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0054] A communication system to which embodiments according to the present disclosure are applied will be described. The communication system to which embodiments according to the present disclosure are applied is not limited to the scope described below, and embodiments according to the present disclosure can be applied to various communication systems. Here, the term "communication system" may be used interchangeably with "communication network."

[0055] Throughout the specification, the network may include, for example, wireless internet such as WiFi (wireless fidelity), mobile internet such as WiBro (wireless broadband internet) or WiMax (world interoperability for microwave access), 2G mobile communication networks such as GSM (global system for mobile communication) or CDMA (code division multiple access), 3G mobile communication networks such as WCDMA (wideband code division multiple access) or CDMA2000, 3.5G mobile communication networks such as HSDPA (high speed downlink packet access) or HSUPA (high speed uplink packet access), 4G mobile communication networks such as LTE (long term evolution) or LTE-Advanced, and 5G mobile communication networks.

[0056] Throughout the specification, a terminal may refer to a mobile station, a mobile terminal, a subscriber station, a portable subscriber station, a user equipment, an access terminal, etc., and may include all or part of the functions of a terminal, a mobile station, a mobile terminal, a subscriber station, a portable subscriber station, a user equipment, an access terminal, etc.

[0057] Here, a desktop computer, laptop computer, tablet PC, wireless phone, mobile phone, smart phone, smart watch, smart glass, e-book reader, portable multimedia player (PMP), portable game console, navigation device, digital camera, digital multimedia broadcasting (DMB) player, digital audio recorder, digital audio player, digital picture recorder, digital picture player, digital video recorder, digital video player, etc. capable of communicating with the terminal can be used.

[0058] Throughout the specification, a base station may also refer to an access point, a radio access station, a node B, an evolved node B, a base transceiver station, a mobile multihop relay (MMR)-BS, etc., and may include all or part of the functions of a base station, an access point, a radio access station, a node B, an eNodeB, a base transceiver station, an MMR-BS, etc.

[0059] Hereinafter, preferred embodiments of the present disclosure will be described in more detail with reference to the attached drawings. In order to facilitate an overall understanding in describing the present disclosure, identical reference numerals will be used for identical components in the drawings, and redundant descriptions of identical components will be omitted.

[0060] Figure 1 is a conceptual diagram illustrating one embodiment of a communication system.

[0061] Referring to FIG. 1, a communication system (100) may include a plurality of communication nodes (110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6). The plurality of communication nodes may support 4G communication (e.g., long term evolution (LTE), advanced LTE-A (LTE-A), 5G communication (e.g., new radio (NR)), etc.) specified in the 3rd generation partnership project (3GPP) standard. 4G communication may be performed in a frequency band of 6 GHz or less, and 5G communication may be performed in a frequency band of 6 GHz or more as well as a frequency band of 6 GHz or less.

[0062] For example, for 4G communication and 5G communication, multiple communication nodes can support a communication protocol based on CDMA (code division multiple access), a communication protocol based on WCDMA (wideband CDMA), a communication protocol based on TDMA (time division multiple access), a communication protocol based on FDMA (frequency division multiple access), a communication protocol based on OFDM (orthogonal frequency division multiplexing), a communication protocol based on Filtered OFDM, a communication protocol based on CP (cyclic prefix)-OFDM, a communication protocol based on DFT-s-OFDM (discrete Fourier transform-spread-OFDM), a communication protocol based on OFDMA (orthogonal frequency division multiple access), a communication protocol based on SC (single carrier)-FDMA, a communication protocol based on NOMA (Non-orthogonal Multiple Access), a communication protocol based on GFDM (generalized frequency division multiplexing), a communication protocol based on FBMC (filter bank multi-carrier), a communication protocol based on UFMC (universal filtered multi-carrier), a communication protocol based on SDMA (Space Division Multiple Access), etc.

[0063] In addition, the communication system (100) may further include a core network. If the communication system (100) supports 4G communication, the core network may include a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), a mobility management entity (MME), etc. If the communication system (100) supports 5G communication, the core network may include a user plane function (UPF), a session management function (SMF), an access and mobility management function (AMF), etc.

[0064] Meanwhile, each of the plurality of communication nodes (110-1, 110-2, 110-3, 120-1, 120-2, 130-1, 130-2, 130-3, 130-4, 130-5, 130-6) constituting the communication system (100) may have the following structure.

[0065] Figure 2 is a block diagram illustrating one embodiment of a communication node constituting a communication system.

[0066] Referring to FIG. 2, a communication node (200) may include at least one processor (210), a memory (220), and a transmission / reception device (230) that is connected to a network and performs communication. In addition, the communication node (200) may further include an input interface device (240), an output interface device (250), a storage device (260), etc. Each component included in the communication node (200) may be connected by a bus (270) and communicate with each other.

[0067] However, each component included in the communication node (200) may be connected through an individual interface or individual bus centered around the processor (210), rather than a common bus (270). For example, the processor (210) may be connected to at least one of a memory (220), a transmission / reception device (230), an input interface device (240), an output interface device (250), and a storage device (260) through a dedicated interface.

[0068] The processor (210) can execute program commands stored in at least one of the memory (220) and the storage device (260). The processor (210) may refer to a central processing unit (CPU), a graphics processing unit (GPU), or a dedicated processor in which the methods according to embodiments of the present disclosure are performed. Each of the memory (220) and the storage device (260) may be configured with at least one of a volatile storage medium and a non-volatile storage medium. For example, the memory (220) may be configured with at least one of a read-only memory (ROM) and a random access memory (RAM).

[0069] Referring again to FIG. 1, the communication system (100) may include a plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) and a plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6). The communication system (100) including the base stations (110-1, 110-2, 110-3, 120-1, 120-2) and the terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) may be referred to as an “access network.” The first base station (110-1), the second base station (110-2), and the third base station (110-3) can each form a macro cell. The fourth base station (120-1) and the fifth base station (120-2) can each form a small cell. The fourth base station (120-1), the third terminal (130-3), and the fourth terminal (130-4) can be within the cell coverage of the first base station (110-1). The second terminal (130-2), the fourth terminal (130-4), and the fifth terminal (130-5) can be within the cell coverage of the second base station (110-2). The fifth base station (120-2), the fourth terminal (130-4), the fifth terminal (130-5), and the sixth terminal (130-6) may be within the cell coverage of the third base station (110-3). The first terminal (130-1) may be within the cell coverage of the fourth base station (120-1). The sixth terminal (130-6) may be within the cell coverage of the fifth base station (120-2).

[0070] Here, each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may be referred to as a NodeB, an evolved NodeB, a BTS (base transceiver station), a radio base station, a radio transceiver, an access point, an access node, an RSU (road side unit), a RRH (radio remote head), a TP (transmission point), a TRP (transmission and reception point), an eNB, a gNB, etc.

[0071] Each of the plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) may be referred to as a UE (user equipment), a terminal, an access terminal, a mobile terminal, a station, a subscriber station, a mobile station, a portable subscriber station, a node, a device, an IoT (Internet of Things) device, an onboard device (mounted module / device / terminal or onboard device / terminal, etc.).

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

[0073] Additionally, each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) may support MIMO transmission (e.g., single user (SU)-MIMO, multi user (MU)-MIMO, massive MIMO, etc.), coordinated multipoint (CoMP) transmission, carrier aggregation (CA) transmission, transmission in an unlicensed band, device to device communication (D2D) (or, proximity services (ProSe)), etc. Here, each of the plurality of terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) can perform an operation corresponding to the base station (110-1, 110-2, 110-3, 120-1, 120-2) and an operation supported by the base station (110-1, 110-2, 110-3, 120-1, 120-2). For example, the second base station (110-2) can transmit a signal to the fourth terminal (130-4) based on the SU-MIMO scheme, and the fourth terminal (130-4) can receive a signal from the second base station (110-2) by the SU-MIMO scheme. Alternatively, the second base station (110-2) can transmit signals to the fourth terminal (130-4) and the fifth terminal (130-5) based on the MU-MIMO method, and each of the fourth terminal (130-4) and the fifth terminal (130-5) can receive signals from the second base station (110-2) based on the MU-MIMO method.

[0074] Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can transmit a signal to the fourth terminal (130-4) based on the CoMP scheme, and the fourth terminal (130-4) can receive a signal from the first base station (110-1), the second base station (110-2), and the third base station (110-3) based on the CoMP scheme. Each of the plurality of base stations (110-1, 110-2, 110-3, 120-1, 120-2) can transmit and receive a signal with terminals (130-1, 130-2, 130-3, 130-4, 130-5, 130-6) within its cell coverage based on the CA scheme. Each of the first base station (110-1), the second base station (110-2), and the third base station (110-3) can control 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 the second base station (110-2) and the third base station (110-3).

[0075] Next, methods for setting up and managing a wireless interface in a communication system will be described. Even if a method (e.g., signal transmission or reception) performed by a first communication node among communication nodes is described, a corresponding second communication node can perform a method (e.g., signal reception or transmission) corresponding to the method performed by the first communication node. That is, if the operation of a terminal is described, the corresponding base station can perform an operation corresponding to the operation of the terminal. Conversely, if the operation of a base station is described, the corresponding terminal can perform an operation corresponding to the operation of the base station.

[0076] Meanwhile, in a communication system, a base station can perform all functions of a communication protocol (e.g., remote radio transmission / reception function, baseband processing function). Alternatively, among all functions of a communication protocol, the remote radio transmission / reception function can be performed by a transmission reception point (TRP) (e.g., f(flexible)-TRP), and among all functions of a communication protocol, the baseband processing function can be performed by a baseband unit (BBU) block. A TRP can be a remote radio head (RRH), a radio unit (RU), a transmission point (TP), etc. A BBU block can include at least one BBU or at least one digital unit (DU). A BBU block can be referred to as a "BBU pool", a "centralized BBU", etc. A TRP can be connected to a BBU block via a wired fronthaul link or a wireless fronthaul link. A communication system consisting of a backhaul link and a fronthaul link can be as follows. When the function split method of the communication protocol is applied, the TRP can selectively perform some functions of the BBU or some functions of the MAC (medium access control) / RLC (radio link control).

[0077] Meanwhile, both LTE and NR systems are cellular systems based on orthogonal frequency division multiplexing (OFDM). Below, the physical layer channel structures for transmitting control information in LTE and 5G new radio (NR) systems are described. In the following description, the 5G NR system may be referred to as either a 5G system or an NR system.

[0078] Figure 3a is a conceptual diagram for explaining the channel configuration of the physical layer in an LTE system.

[0079] In an LTE system, a physical layer channel may be composed of time-frequency resources. FIG. 3A illustrates a channel bandwidth (301) and a subframe (302) transmitted within the channel bandwidth (301) in an LTE system. The channel bandwidth (301) illustrated in FIG. 3A may be the entire bandwidth that a base station of the LTE system can use. In addition, a subframe (320) may include a physical downlink control channel (PDCCH) region (311) and a physical downlink shared channel (PDSCH) region (312). The PDCCH region (311) may be a region in which control information is transmitted. The PDSCH region (312) may be a region in which data is transmitted. Data transmitted through the PDSCH region (312) may be transmitted through resources indicated by the control information included in the PDCCH region (311).

[0080] As illustrated in FIG. 3A, in an LTE system, the PDCCH region (311) can be transmitted across the entire channel bandwidth (301) from a frequency perspective. In an LTE system, the PDCCH region (311) can be transmitted at a specific location within a subframe (302) from a time perspective. For example, in an LTE system, the PDCCH region (311) can be transmitted in a predetermined number of OFDM symbols from the start of a subframe (302).

[0081] Figure 3b is a conceptual diagram for explaining the channel configuration of the physical layer in a 5G NR system.

[0082] The physical layer channel of a 5G NR system may also be composed of time-frequency resources. FIG. 3b illustrates a channel bandwidth (321) and a single slot transmitted within the channel bandwidth (321). The channel bandwidth (321) illustrated in FIG. 3b may be the entire bandwidth that a base station of a 5G NR system can use. In the case of a 5G NR system, the channel bandwidth (321) may be composed of one or more bandwidth parts (BWPs). In the example of FIG. 3b, bandwidth part #1 (BWP #1) (331) and bandwidth part #2 (BWP #2) (332) are illustrated for convenience of explanation.

[0083] Each of bandwidth portion #1 (331) and bandwidth portion #2 (332) may represent a frequency resource, and slot (322) may represent a time resource. One slot (322) of bandwidth portion #1 (331) may include a control resource set (CORESET) region (341a) and a PDSCH region (342a), and one slot (322) of bandwidth portion #2 (332) may include a control resource set (CORESET) region (341b) and a PDSCH region (342b). Accordingly, the resource excluding the CORESET region (341a) in bandwidth portion #1 (331) may be the PDSCH region (342a) of bandwidth portion #1 (331), and the resource excluding the CORESET region (341b) of bandwidth portion #2 (332) may be the PDSCH region (342b) of bandwidth portion #2 (332).

[0084] In the CORESET area (341a) of bandwidth portion #1 (331), control information for data transmitted through PDSCH (342a) in bandwidth portion #1 (331) can be transmitted, and in the CORESET area (341b) of bandwidth portion #2 (332), control information for data transmitted through PDSCH (342b) in bandwidth portion #2 (332) can be transmitted.

[0085] Comparing Figures 3a and 3b, in the LTE system, the PDCCH is transmitted across the entire system bandwidth, but in the NR system, the control channel PDCCH can be transmitted by setting the CORESET for each BWP. Furthermore, in the LTE system, the PDCCH is transmitted based on a subframe basis, while in the 5G NR, the PDCCH can be transmitted based on a slot basis.

[0086] In LTE systems, resources are allocated on a subframe-by-subframe basis. Therefore, changes in the number of terminals and the amount of data transmitted can vary from subframe to subframe. Therefore, in LTE systems, a Physical Control Format Indicator Channel (PCFICH) must be transmitted to terminals for each subframe, indicating the PDCCH time resource area.

[0087] The PCFICH can transmit a control format indicator (CFI). The CFI can indicate the number of OFDM symbols, which is the time-domain for PDCCH transmission. The CFI value can be exemplified as shown in Table 1 below.

[0088] CFI32-bit CFI codeword1011011011011011011011011011011011012101101101101101101101101101101101101101103110110110110110110110110110110110110110114(Reserved)0 ...

[0089] Table 1 shows that the CFI value can indicate the number of OFDM symbols used to transmit a control channel, for example, a PDCCH and a physical hybrid ARQ indicator channel (PHICH), in each subframe. For example, if the CFI is set to 1, the CFI can indicate that one OFDM symbol is used to transmit the control channel, if the CFI is set to 2, the CFI can indicate that two OFDM symbols are used to transmit the control channel, and if the CFI is set to 3, the CFI can indicate that three OFDM symbols are used to transmit the control channel. Since a control channel in an LTE system consists of 1 to 3 OFDM symbols, a CFI value of 4 can be a reserved value.

[0090] In addition, as illustrated in Table 1, each of the CFI values ​​can correspond to a CFI codeword consisting of 32 bits, as shown in Table 1. The 32-bit codeword corresponding to the CFI value can be mapped to a resource element (RE), which is a physical layer resource, through scrambling, modulation, and layer mapping / precoding. At this time, the 32-bit codeword corresponding to the CFI value can be modulated using quadrature phase shift keying (QPSK) modulation and mapped to a total of 16 REs. In other words, the PCFICH can be mapped to 16 REs.

[0091] Figure 4a is a conceptual diagram illustrating the configuration of one subframe composed of six physical resource blocks in an LTE system.

[0092] Referring to FIG. 4a, six physical resource blocks (PRBs) (401, 402, …, 403, 404), which are frequency resources, are illustrated. Each of the PRBs (401, 402, …, 403, 404) may be composed of 12 subcarriers. PRB #0 (401) may be composed of 12 subcarriers from subcarrier #0 to subcarrier #11, and PRB #1 (402) may be composed of 12 subcarriers from subcarrier #12 to subcarrier #23. PRB #2, which is not illustrated in FIG. 4a, may be composed of 12 subcarriers from subcarrier #24 to subcarrier #35, PRB #3 may be composed of 12 subcarriers from subcarrier #36 to subcarrier #47, PRB #4 (403) may be composed of 12 subcarriers from subcarrier #48 to subcarrier #59, and PRB #5 (404) may be composed of 12 subcarriers from subcarrier #60 to subcarrier #17.

[0093] Also, according to the example of FIG. 4a, subframe #1 (410) may be composed of slot #0 (411) and slot #1 (412). Accordingly, PRBs (401, 402, …, 403, 404) may be transmitted in slot #0 (411) and slot #1 (412). One slot may be composed of 7 OFDM symbols. In other words, slot #0 (411) may be composed of OFDM symbols #0 to OFDM symbols #6, and slot #1 (412) may also be composed of OFDM symbols #0 to OFDM symbols #6.

[0094] Meanwhile, as previously described, control information may be transmitted in each subframe. Since the control information may include control information for the PDSCH transmitting data, if the subframe (410) consists of slot #0 (411) and slot #1 (412), the control information may be transmitted in slot #0 (411).

[0095] FIG. 4b is a conceptual diagram illustrating the configuration of a physical layer channel when subframe #1 is transmitted through PRB #0 and PRB #1 illustrated in FIG. 4a, and FIG. 4c is a conceptual diagram illustrating the configuration of a physical layer channel when subframe #1 is transmitted through PRB #4 and PRB #5 illustrated in FIG. 4a.

[0096] FIGS. 4b and 4c can be examples of the structure of a subframe including a PCFICH when two OFDM symbols are allocated to a PDCCH in an LTE system. As illustrated in FIGS. 4b and 4c, PCFICH (421), PHICH (422), and PDCCH (423) are control information and can be arranged according to preset rules in the first two OFDM symbols of slot #0 (411). A base station of an LTE system can transmit a cell-specific reference signal (CRS) as a downlink reference signal (RS) regardless of whether data is transmitted in the cell or whether a user exists. As illustrated in FIGS. 4b and 4c, the CRS can be regularly transmitted not only in the two OFDM symbols of the PDCCH but also in the PDSCH region where data is transmitted.

[0097] As illustrated in FIGS. 4b and 4c, PCFICH (421) can always be transmitted in the first OFDM symbol of a subcarrier and can be distributed in the frequency domain based on preset rules.

[0098] Next, the resources and data through which control information is transmitted in the NR system are described. As previously described, in the NR system, the system bandwidth can be configured with multiple BWPs. Furthermore, a CORESET can be configured within each of the multiple BWPs. The PDCCH, a control channel, can be transmitted within the CORESET.

[0099] Figure 5 is a conceptual diagram illustrating a case where CORESET is set within one BWP in the NR system.

[0100] Referring to FIG. 5, one slot (502) for BWP #1 (501) is illustrated. The number of OFDM symbols constituting one slot may vary depending on the cyclic prefix (CP) type. The CP type may be classified into normal CP and extended CP. If an OFDM symbol has a normal CP, one slot may be composed of 14 OFDM symbols, and if an OFDM symbol has an extended CP, one slot may be composed of 12 OFDM symbols. One slot (502) illustrated in FIG. 5 is an example of a case where an OFDM symbol has a normal CP, and one slot is illustrated as being composed of 14 OFDM symbols.

[0101] Meanwhile, the base station can transmit CORESET configuration information to terminals via radio resource control (RRC) signaling. In other words, an RRC message containing CORESET configuration information can be transmitted via RRC signaling. The CORESET configuration information can indicate at least one of the frequency resources of the CORESET within the BWP, the time resources of the CORESET, the period of the CORESET (in slot units), the position of the OFDM symbols of the CORESET within the slot, or the number of OFDM symbols of the CORESET within the slot.

[0102] The time resource of a CORESET included in the CORESET configuration information can indicate the temporal position of the CORESET within a slot. In addition, the number of OFDM symbols of the CORESET included in the CORESET configuration information can indicate the number of OFDM symbols allocated to the CORESET.

[0103] For example, if the number of OFDM symbols of the CORESET included in the CORESET configuration information indicates 1, the CORESET can be transmitted in only one OFDM symbol. As another example, if the number of OFDM symbols of the CORESET included in the CORESET configuration information indicates 2, the CORESET can be transmitted via 2 consecutive OFDM symbols. As another example, if the number of OFDM symbols of the CORESET included in the CORESET configuration information indicates 3, the CORESET can be transmitted via 3 consecutive OFDM symbols. According to the current 5G NR standard, the number of OFDM symbols of the CORESET can be composed of 1 OFDM symbol to 3 OFDM symbols, the same as the LTE system.

[0104] According to the example of Fig. 5, a first CORESET (510) transmitted over a length of one OFDM symbol and a second CORESET (520) transmitted over a length of three OFDM symbols are illustrated. Within the slot (502) of BWP #1 (501), the base station can transmit a PDCCH in the CORESET (510, 520) configured by the CORESET configuration information.

[0105] The PDCCH transmitted in the second CORESET (520) may be composed of control channel elements (CCEs) (530). As illustrated in FIG. 5, one CCE (530) may be composed of six resource element groups (REGs). In FIG. 5, the indexes of the REGs are illustrated as 0, 1, 2, 3, 4, 5, 6, 7, 8, …, and an example is provided where REGs with indices of 0, 1, 2, 3, 4, and 5 are included in the CCE (530).

[0106] Each REG can be composed of 12 OFDM symbols, and one OFDM symbol can mean one resource element (RE). In addition, one REG can include three demodulation reference signals (DMRS), as illustrated in FIG. 5. Therefore, since control information cannot be transmitted on the three REs in which DMRS is transmitted in one REG, the number of REs that can be used to transmit control information in one REG is 9. In addition, the number of CCEs can increase depending on the aggregation level. When the wireless channel condition is poor, the aggregation level can aggregate up to 16 CCEs. Therefore, the aggregation level can mean the number of CCEs.

[0107] As previously explained, in a 5G NR system, CORESET configuration information transmitted from a base station to a terminal can be transmitted via RRC signaling. Therefore, long communication distances between the base station and the terminal can result in RRC signaling delays. This delay, particularly in satellite-based communication systems, can be significantly greater than in terrestrial communication systems. Delays in CORESET configuration information can reduce the flexibility of radio resource allocation.

[0108] Furthermore, in wireless communication systems, delay can not only cause a decrease in data transmission speed but also increase error rates. In other words, delay in wireless communication systems can act as a factor that degrades system performance. Specifically, if the error rate in control information increases, data reception, demodulation, and / or decoding may become impossible.

[0109] In current 5G NR systems, the number of OFDM symbols that can be configured in CORESET is either 1, 2, or 3. This limitation of the CORESET region to a maximum of 3 OFDM symbols can limit system flexibility. Therefore, an additional dynamic resource allocation method for CORESET region configuration is needed to supplement the transmission of CORESET region configuration information, which relies on RRC signaling. Furthermore, a method is needed to reduce the error rate of the PDCCH transmitted via CORESET.

[0110] Meanwhile, the LTE system's PCFICH transmission method allows for different PDCCH region configurations for each subframe, but the PCFICH is limited to one, two, or three OFDM symbols per PDCCH region. In other words, the PDCCH region supports only up to three OFDM symbols. Therefore, LTE systems do not support configurations with more OFDM symbols. Furthermore, the PCFICH is mapped only to the first OFDM symbol based on the RE, and four cell-specific reference signals (CRSs) are included within one REG constituting the first OFDM symbol. Therefore, it is difficult to directly apply the LTE system's PCFICH transmission method to the NR system.

[0111] The present disclosure, described below, provides a method and device for dynamic resource allocation of a control resource set (CORESET) to support data transmission of large-scale terminals with long communication delays or to support coverage expansion in a wireless communication system. Furthermore, a method and device for transmitting and receiving control information and data based on CORESET operational resource allocation are provided. Furthermore, a method for transmitting control information using CORESET is also provided.

[0112] The present disclosure, described below, discloses a method for dynamically allocating additional CORESETs dependent on RRC signaling in a wireless communication system as described above.

[0113] The present disclosure described below may be comprised of three embodiments, and the three embodiments are described in more detail in the following description.

[0114] [Example 1]

[0115] A first embodiment of the present disclosure may be a case where information indicating whether a CORESET region is expanded is indicated by OFDM symbol(s) adjacent to a PDCCH region. The first embodiment may be divided into multiple embodiments depending on the number of OFDM symbols indicating whether a CORESET region is expanded and / or the positions of the OFDM symbols.

[0116] Figure 6 is a conceptual diagram for explaining the transmission of information indicating whether to expand a CORESET area using one REG in one BWP and the case where CORESET is expanded.

[0117] Referring to FIG. 6, one slot (602) for BWP (601) is illustrated. The number of OFDM symbols constituting one slot may vary depending on the CP type as described in FIG. 5. The CP types may be classified into normal CP and extended CP. If an OFDM symbol has a normal CP, one slot may be composed of 14 OFDM symbols, and if an OFDM symbol has an extended CP, one slot may be composed of 12 OFDM symbols. One slot (602) illustrated in FIG. 6 is an example of a case where an OFDM symbol has a normal CP, and one slot is illustrated as being composed of 14 OFDM symbols.

[0118] According to the 5G NR system specifications, a base station can have multiple BWPs across its available bandwidth (BW). A base station can allocate one to four BWPs to a terminal. Even if a base station allocates four BWPs to a terminal, only one BWP can be activated for a given terminal at a given time. Additionally, the base station can configure a CORESET for each BWP.

[0119] The base station can transmit CORESET configuration information for configuring CORESET for each BWP to each terminal via RRC signaling. In other words, an RRC message containing CORESET configuration information can be transmitted to the terminal via RRC signaling. The CORESET configuration information can indicate the frequency resource of the CORESET within the BWP, the time resource of the CORESET, the period of the CORESET (in slot units), the OFDM symbol position of the CORESET within the slot, and the number of OFDM symbols of the CORESET within the slot.

[0120] The time resource included in the CORESET configuration information can indicate the number of OFDM symbols within a slot. According to the 5G NR specification, the number of OFDM symbols that can be configured by the CORESET configuration information can be one OFDM symbol, two consecutive OFDM symbols, or three consecutive OFDM symbols.

[0121] In the example of FIG. 6, a first CORESET (610) transmitted over a length of one OFDM symbol and a second CORESET (620) transmitted over a length of three OFDM symbols are illustrated. Although the example of FIG. 6 illustrates the first CORESET (610) having a length of one OFDM symbol and the second CORESET (620) having a length of three OFDM symbols, a CORESET having two OFDM symbol lengths may also be configured. In other words, although FIG. 6 illustrates the first CORESET (610) transmitted over a length of one OFDM symbol and the second CORESET (620) transmitted over three consecutive OFDM symbols, it should be noted that this is for the purpose of helping understanding and is not intended to limit the present disclosure.

[0122] According to the embodiment of FIG. 6, when the OFDM symbol length of the CORESET set by the RRC message needs to be extended, the base station can transmit an indicator or information for indicating the extension of the OFDM symbol length of the CORESET. In the following description, for the convenience of explanation, the indicator or information for indicating whether to extend the CORESET is referred to as "additional dynamic resource allocation information (ADRAI)". The ADRAI can be transmitted when at least one of various conditions is satisfied. For example, the base station can transmit when it wants to expand coverage, when the transmission delay is greater than a preset threshold, when transmission to a large number of terminals is required, or when a preset error rate is detected or greater.

[0123] According to the embodiment of FIG. 6, ADRAI may be composed of one REG. Furthermore, ADRAI may be transmitted in the time resource of the first OFDM symbol of the CORESET. The REG through which ADRAI is transmitted may be transmitted through a specific frequency resource in the first OFDM symbol as illustrated in FIG. 6. In other words, in the embodiment of FIG. 6, one REG through which ADRAI is transmitted may be selected from among REGs that are not frequency resources of the CORESET in the first OFDM symbol interval of the CORESET. More specifically, one REG through which ADRAI is transmitted may be a non-CORESET REG that is closest to a subcarrier with the lowest index among the frequency resources of the CORESET.

[0124] Even though the time resource of the REG where ADRAI is transmitted is transmitted in the first OFDM symbol of the CORESET as described in FIG. 6, the frequency resource location of the REG where ADRAI is transmitted may not be limited to the form illustrated in FIG. 6. In other words, the frequency resource location of the REG where ADRAI is transmitted may have various modified forms from FIG. 6. Examples of modifications to the frequency resource location of the REG where ADRAI is transmitted can be exemplified as in the following methods.

[0125] As a modified example of Fig. 6, one REG in which ADRAI is transmitted may be one non-CORESET REG among the frequency resources closest to the subcarrier with the highest index of the CORESET in the first OFDM symbol interval of the CORESET.

[0126] As another variation of FIG. 6, one REG in which ADRAI is transmitted may be one REG having the lowest frequency index among the subcarriers excluding the CORESET in the first OFDM symbol interval of the CORESET.

[0127] As another variation of FIG. 6, one REG in which ADRAI is transmitted may be one REG having the highest frequency index among the subcarriers excluding the CORESET in the first OFDM symbol interval of the CORESET.

[0128] As described above, the frequency resource location of the REG where ADRAI is transmitted may be predefined by the standard. Alternatively, the frequency resource location of the REG where ADRAI is transmitted may be indicated by an RRC message. If the frequency resource location of the REG where ADRAI is transmitted is indicated, this may be when the CORESET extension, described in the second embodiment below, is activated.

[0129] According to the example of FIG. 6, when the first ADRAI (611) for indicating whether to extend the first CORESET (610) indicates the extension of the first CORESET (610), the first extended CORESET (612) can be transmitted in an OFDM symbol consecutive to the first CORESET (610).

[0130] Although the example of FIG. 6 illustrates a case where the first extended CORESET (612) is transmitted in an OFDM symbol that is consecutive to the first CORESET (610), the present disclosure is not limited thereto. In other words, the time resource in which the first extended CORESET (612) is transmitted may be subject to various modifications.

[0131] As a modified example of FIG. 6, when the first ADRAI (611) indicates the extension of the first CORESET (610), the time resource of the first extended CORESET (612) may be transmitted at an OFDM symbol position that is spaced apart by at least one OFDM symbol. The reason why the first extended CORESET (612) is transmitted at an OFDM symbol position that is spaced apart by at least one OFDM symbol from the symbol of the first CORESET (610) may be when considering the time required for the terminal to demodulate and decode the ADRAI.

[0132] As illustrated in FIG. 6, the frequency resources of the first extended CORESET (612) can be transmitted in the same frequency resources as the frequency resources of the first CORESET (610).

[0133] As described above, the base station can additionally configure the first extended CORESET (612) using the first ADRAI (611). Accordingly, when the base station configures the first extended CORESET (612) to be transmitted using the first ADRAI (611), the base station can transmit the PDCCH using the first CORESET (610) and the first extended CORESET (612). At this time, the PDCCH transmitted within the first CORESET (610) may be repeated within the first extended CORESET (612). In other words, the extended CORESET can be configured for repeated PDCCH transmission.

[0134] Next, the expansion of the second CORESET (620) is described. Referring to FIG. 6, the second ADRAI (621) for indicating whether the second CORESET (620) is expanded can be transmitted at the time of the first OFDM symbol among three consecutive OFDM symbols in the time dimension as described above. At this time, the position of the second ADRAI (621) in the frequency resource can be configured as one REG other than the CORESET that is closest to the subcarrier having the lowest frequency index among the CORESET frequency resources of the first OFDM symbol section of the second CORESET (620) as illustrated in FIG. 6. The position of the second ADRAI (621) in the frequency resource can be modified in various ways as described above.

[0135] According to the example of FIG. 6, if the second ADRAI (621) indicating whether to extend the second CORESET (620) indicates the extension of the first CORESET (620), the second extended CORESET (622) can be transmitted in an OFDM symbol consecutive to the second CORESET (620).

[0136] Although the example of FIG. 6 illustrates a case where the second extended CORESET (622) is transmitted in an OFDM symbol that is consecutive to the second CORESET (620), the present disclosure is not limited thereto. In other words, the time resource for transmitting the second extended CORESET (622) may also be subject to various modifications, similar to the case where the first extended CORESET (612) is transmitted above.

[0137] Additionally, the frequency resources of the second extended CORESET (622) can be transmitted in the same frequency resources as the frequency resources of the second CORESET (620).

[0138] Meanwhile, since one REG through which ADRAI is transmitted follows the 5G NR standard, it can be composed of 12 REs. As illustrated in FIG. 6, one REG includes three DMRSs, so extended information on the OFDM symbol length of the CORESET can be transmitted using a total of nine REs. Considering QPSK modulation, the codeword length using nine REs can be 18 bits. In addition, the embodiment of FIG. 6 only exemplifies the case where the extended CORESET has one OFDM symbol length. However, the length of the extended CORESET is not limited to one OFDM symbol length. The base station can indicate the OFDM symbol length of the extended CORESET by setting the 18-bit codeword as shown in Table 2 and / or Table 3 below.

[0139] Table 2 below may be an example of a CFI codeword illustrating a case where the OFDM symbol length of the extended CORESET indicates a length of one OFDM symbol or a length of two OFDM symbols. If the extended CORESET is not required, the base station may not transmit the ADRAI illustrated in FIG. 6.

[0140] Extension information for OFDM symbol length 18-bit CFI codeword 10110110110110110112101101101101101101101

[0141] In Table 2, “extension information of OFDM symbol length” may mean the OFDM symbol length of an extended CORESET set by ADRAI according to the present disclosure in addition to the CORESET indicated by RRC signaling in the corresponding BWP.

[0142] For example, if the OFDM symbol length of CORESET is determined to be two OFDM symbol lengths by RRC signaling and ADRAI indicates a value of 2 as exemplified in Table 2, the extended CORESET can be transmitted with a length of two OFDM symbols. Accordingly, the entire CORESET transmitted in one slot (602) of the BWP can have a length of four OFDM symbols.

[0143] According to the example in FIG. 6, the first CORESET (610) may be a case where the OFDM symbol length of the CORESET is indicated as 1 OFDM symbol by RRC signaling. If the base station needs to extend the length of the first CORESET (610), the first ADRAI (611) may be set. If the base station wants to extend the first CORESET (610) by the length of 1 OFDM symbol as in the example in FIG. 6, the base station may set the first ADRAI (611) to "011011011011011011" using the 18-bit CFI codeword in Table 2. In addition, the base station may transmit control information (e.g., downlink control information (DCI)) to the terminal through the first CORESET (610) and the first extended CORESET (612). At this time, DCI may be transmitted via PDCCH, and at least some of the DCI transmitted via the first extended CORESET (612) may be repeated DCIs of the DCI transmitted in the first CORESET (610).

[0144] Accordingly, the terminal can receive the PDCCH through the first CORESET (610) set by RRC. At this time, the terminal can check whether the first extended CORESET (612) is set by checking whether the ADRAI is received in the resource where the ADRAI is transmitted. If the ADRAI is received from the base station, the terminal can check the OFDM symbol length in which the first extended CORESET (612) is transmitted based on the received ADRAI in Table 2. On the other hand, if the ADRAI is not received from the base station, the terminal can interpret that only the first CORESET (610) is set. If the first extended CORESET (612) is set, the terminal can also check whether the PDCCH transmitted through the first CORESET (610) is repeatedly transmitted through the first extended CORESET (612).

[0145] According to the example in FIG. 6, the second CORESET (620) may be a case where the OFDM symbol length of the CORESET is indicated as 3 OFDM symbols by RRC signaling. If the base station needs to extend the second CORESET (620), it may set the second ADRAI (621). If it is desired to extend the second CORESET (620) by the length of 1 OFDM symbol as in the example in FIG. 6, the base station may set the second ADRAI (621) to "011011011011011011" using the 18-bit CFI codeword in Table 2. Then, the base station may transmit control information (e.g., DCI) to the terminal through the second CORESET (620) and the second extended CORESET (622). At this time, DCI may be transmitted via PDCCH, and at least some of the DCI transmitted via the second extended CORESET (622) may be repeated DCIs of the DCI transmitted in the second CORESET (620).

[0146] Accordingly, the terminal can receive the PDCCH through the second CORESET (620) set by RRC. At this time, the terminal can check whether the second extended CORESET (622) is set by checking whether the ADRAI is received in the resource where the ADRAI is transmitted. If the ADRAI is received from the base station, the terminal can check the OFDM symbol length in which the second extended CORESET (622) is transmitted based on the received ADRAI in Table 2. On the other hand, if the ADRAI is not received from the base station, the terminal can interpret that only the second CORESET (620) is set. If the second extended CORESET (622) is set, the terminal can also check whether the PDCCH transmitted through the second CORESET (610) is repeatedly transmitted through the second extended CORESET (622).

[0147] Meanwhile, the base station can extend the OFDM symbol length of CORESET in the time dimension by two or three OFDM symbol lengths, as shown in Table 3 below, depending on the situation.

[0148] Extension information for OFDM symbol length 18-bit CFI codeword 20110110110110110113101101101101101101101101

[0149] The OFDM symbol lengths illustrated in Table 3 may be of the same form as the OFDM symbol lengths in Table 2, except that they are different. Therefore, Table 3 can be understood in the same way based on Table 2 described above.

[0150] Meanwhile, the CFI codeword of ADRAI, as shown in Table 2 or Table 3, may be preset to the terminal by RRC. Alternatively, the CFI codeword of ADRAI may be predefined in the standard. If the CFI codeword of ADRAI is predefined in the standard, the base station and the terminal may store the CFI codeword of ADRAI in memory.

[0151] Furthermore, the CFI codewords illustrated in Tables 2 and 3 are merely examples to aid understanding of the present disclosure. Therefore, the CFI codewords should not be understood as being limited to the forms illustrated in Tables 2 and / or 3. In other words, the CFI codewords may be set to values ​​other than those illustrated in Tables 2 and / or 3.

[0152] According to the present disclosure described with reference to FIG. 6, an ADRAI indicating whether a CORESET is extended can be transmitted using a single REG. The ADRAI can be transmitted using any one of the frequency resources excluding the CORESET among the time resources in which the first OFDM symbol of the CORESET set by RRC is transmitted. When the ADRAI is transmitted, the CORESET and the extended CORESET can be transmitted. The OFDM symbol length in which the extended CORESET is transmitted can be indicated by the ADRAI. At least some of the DCIs transmitted in the extended CORESET can be repeated transmissions of the CORESET.

[0153] Figure 7 is a conceptual diagram for explaining the transmission of information indicating whether to expand the CORESET area using two REGs in one BWP and the case where CORESET is expanded.

[0154] Referring to Fig. 7, one slot (702) is exemplified in a BWP (701) allocated to a specific terminal. The OFDM symbol in Fig. 7 has a normal CP, and one slot (702) may be composed of 14 OFDM symbols.

[0155] The base station can transmit CORESET configuration information to each terminal via RRC signaling. In other words, an RRC message containing CORESET configuration information can be transmitted to the terminal via RRC signaling. The CORESET configuration information can indicate the frequency resource of the CORESET within the BWP, the time resource of the CORESET, the period of the CORESET (in slot units), the position of the OFDM symbol of the CORESET within the slot, and the number of OFDM symbols of the CORESET within the slot. According to the 5G NR standard, the number of OFDM symbols that can be configured by the CORESET configuration information can be any one of one OFDM symbol, two consecutive OFDM symbols, or three consecutive OFDM symbols.

[0156] In the example of FIG. 7, the first CORESET (710) transmitted over a length of one OFDM symbol and the second CORESET (720) transmitted over a length of three OFDM symbols are exemplified, as previously exemplified in FIG. 6.

[0157] According to the embodiment of FIG. 7, when the base station needs to extend the OFDM symbol length of the CORESET set by the RRC message, it can transmit an indicator or information for indicating the extension of the OFDM symbol length of the CORESET. As described in FIG. 6, in the following description, for the convenience of explanation, the indicator or information for indicating whether to extend the CORESET is referred to as ADRAI.

[0158] According to the embodiment of FIG. 7, unlike FIG. 6, the ADRAI may be composed of two REGs. The ADRAI composed of two REGs may be transmitted in the first OFDM symbol period of the CORESET. In the embodiment of FIG. 7, the ADRAI composed of two REGs may be transmitted through a specific frequency resource in the first OFDM symbol period of the CORESET. In other words, in the embodiment of FIG. 7, the frequency resources of the two REGs through which the ADRAI is transmitted may be two REGs, other than the CORESET, among the resources closest to the subcarrier with the lowest index of the CORESET.

[0159] The frequency resource locations of the two REGs transmitting ADRAI are not limited to the form illustrated in FIG. 7. In other words, the frequency resource locations of the REGs transmitting ADRAI may take on various variations from FIG. 7. Examples of variations in the frequency resource locations of the REGs transmitting ADRAI can be illustrated as follows.

[0160] As a modified example of Fig. 7, the two REGs through which ADRAI is transmitted may be two non-CORESET REGs among the frequency resources closest to the subcarrier with the highest index of the CORESET in the first OFDM symbol interval of the CORESET. In this case, the two REGs through which ADRAI is transmitted may be REGs with consecutive frequency resources.

[0161] As another variation of FIG. 7, the two REGs through which ADRAI is transmitted may be the two REGs having the lowest frequency index among the subcarriers excluding the CORESET in the first OFDM symbol section of the CORESET. In this case, the frequency resources of the two REGs through which ADRAI is transmitted may be consecutive REGs.

[0162] As another variation of FIG. 7, the two REGs through which ADRAI is transmitted may be the two REGs having the highest frequency indices among the subcarriers excluding the CORESET in the first OFDM symbol section of the CORESET. In this case, the two REGs through which ADRAI is transmitted may be REGs with consecutive frequency resources.

[0163] As another variation example of FIG. 7, the two REGs through which ADRAI is transmitted are REGs transmitted in the first OFDM symbol interval of the CORESET, and the first REG among the two REGs may be a non-CORESET REG among the frequency resources closest to the subcarrier with the lowest index of the CORESET, and the second REG among the two REGs may be a non-CORESET REG among the frequencies closest to the subcarrier with the highest index of the CORESET. This variation example may be a case where the REGs constituting the ADRAI are arranged at positions apart from the frequency resources. In other words, the two REGs through which ADRAI is transmitted may be a REG adjacent to the CORESET among the resources outside the CORESET among the frequencies higher than the CORESET, and a REG adjacent to the CORESET among the frequencies lower than the CORESET.

[0164] There may be many more examples of cases where two REGs transmitting ADRAI are not contiguous in frequency resources, as described above, and this disclosure does not impose any restrictions on such cases. Therefore, not all embodiments can be listed, and therefore, a description of all embodiments is omitted from this disclosure. However, those skilled in the art will appreciate that, based on the contents described in this disclosure, ADRAI can be expanded in various forms when composed of two REGs.

[0165] Meanwhile, the location of the ADRAI illustrated in FIG. 7 or the modified location of the ADRAI according to the modified example described above may be indicated by an RRC message. As another example, the location of the ADRAI illustrated in FIG. 7 or the modified location of the ADRAI according to the modified example described above may be predefined as a standard specification in a communication system.

[0166] According to the example of FIG. 7, when the first ADRAI (711, 712) indicating whether to extend the first CORESET (710) indicates the extension of the first CORESET (710), the first extended CORESET (713) can be transmitted in an OFDM symbol consecutive to the first CORESET (710).

[0167] Although the example of FIG. 7 illustrates a case where the first extended CORESET (713) is transmitted in an OFDM symbol that is consecutive to the first CORESET (710), the present disclosure is not limited thereto. In other words, the time resource in which the first extended CORESET (713) is transmitted may be subject to various modifications.

[0168] As a modified example of FIG. 7, when the first ADRAI (711, 712) indicates the extension of the first CORESET (710), the time resource of the first extended CORESET (713) may be transmitted at an OFDM symbol position that is spaced apart by at least one OFDM symbol. The reason why the first extended CORESET (713) is transmitted at an OFDM symbol position that is spaced apart by at least one OFDM symbol from the symbol of the first CORESET (710) may be when considering the time required for the terminal to demodulate and decode the ADRAI.

[0169] As illustrated in FIG. 7, the frequency resources of the first extended CORESET (713) can be transmitted in the same frequency resources as the frequency resources of the first CORESET (710).

[0170] As described above, the base station can additionally configure the first extended CORESET (713) using the first ADRAI (711, 712). Accordingly, when the base station configures the first extended CORESET (712) to be transmitted using the first ADRAI (711, 712), the base station can transmit the PDCCH using the first CORESET (710) and the first extended CORESET (713). At this time, the PDCCH transmitted within the first CORESET (710) may be repeated within the first extended CORESET (713).

[0171] Next, the expansion of the second CORESET (720) is described. Referring to FIG. 7, the second ADRAI (721, 722) for indicating whether the second CORESET (720) is expanded can be transmitted at the time of the first OFDM symbol among three consecutive OFDM symbols in the time dimension as described above. At this time, the position of the second ADRAI (721, 722) in the frequency resource can be configured as two REGs other than the CORESET that are closest to the subcarrier having the lowest frequency index among the CORESET frequency resources of the first OFDM symbol section of the second CORESET (720) as illustrated in FIG. 7. The position of the second ADRAI (721, 722) in the frequency resource can be modified in various ways as described above.

[0172] According to the example of FIG. 7, when the second ADRAI (721, 722) indicating whether to extend the second CORESET (720) indicates the extension of the second CORESET (720), the second extended CORESET (723) can be transmitted in an OFDM symbol consecutive to the second CORESET (720).

[0173] Although the example of FIG. 7 illustrates a case where the second extended CORESET (723) is transmitted in an OFDM symbol that is consecutive to the second CORESET (720), the present disclosure is not limited thereto. In other words, the time resource for transmitting the second extended CORESET (723) may also be subject to various modifications, similar to the case where the first extended CORESET (713) is transmitted above.

[0174] Additionally, the frequency resources of the second extended CORESET (723) can be transmitted in the same frequency resources as the frequency resources of the second CORESET (720).

[0175] Meanwhile, since one REG through which ADRAI is transmitted follows the 5G NR standard, it can be composed of 12 REs. As illustrated in FIG. 7, one REG includes three DMRSs, so extended information on the OFDM symbol length of the CORESET can be transmitted using a total of 18 REs. Considering QPSK modulation, the codeword length using 18 REs can be 36 bits. In addition, the embodiment of FIG. 7 only exemplifies the case where the extended CORESET has a length of one OFDM symbol. However, the length of the extended CORESET is not limited to the length of one OFDM symbol. The base station can explain the 36-bit codeword by extending it using Table 2 and / or Table 3 described above. In this way, the OFDM symbol length of the extended CORESET can be indicated using the extended 36-bit codeword using Table 2 and / or Table 3.

[0176] When using a 36-bit codeword, "extension information of the OFDM symbol length" can also be indicated as exemplified in Table 2 and / or Table 3. Since "extension information of the OFDM symbol length" is described in Table 2 and Table 3, a duplicate description is omitted.

[0177] The terminal can receive the PDCCH through the first CORESET (710) set by RRC. At this time, the terminal can check whether the first extended CORESET (713) is set by checking whether the ADRAI (711, 712) is received in the resource where the ADRAI is transmitted. If the ADRAI (711, 712) is received from the base station, the terminal can check the OFDM symbol length through which the first extended CORESET (713) is transmitted based on the received ADRAI (711, 712). On the other hand, if the ADRAI is not received from the base station, the terminal can interpret that only the first CORESET (710) is set. If the first extended CORESET (712) is set, the terminal can also check whether the PDCCH transmitted through the first CORESET (710) is repeatedly transmitted through the first extended CORESET (713).

[0178] In the above, only the case where the terminal receives only the first CORESET (710) or receives both the first CORESET (710) and the first extended CORESET (713) based on ADRAI (711, 712) that instructs transmission of the first CORESET (710) and the first extended CORESET (713) has been described.

[0179] The terminal may operate in the same manner even when it receives the second CORESET (720) based on ADRAI (721, 722) that instructs transmission of the second CORESET (720) and the second extended CORESET (723), or when it receives the second CORESET (720) and the second extended CORESET (723).

[0180] Figure 8 is another conceptual diagram for explaining the transmission of information indicating whether to expand the CORESET area using two REGs in one BWP and the case where the CORESET is expanded.

[0181] Referring to Fig. 8, one slot (802) in a BWP (801) allocated to a specific terminal is illustrated. The OFDM symbol of the BWP (801) of Fig. 8 may have a normal CP, and one slot (702) may be composed of 14 OFDM symbols.

[0182] The base station can transmit CORESET configuration information to each terminal via RRC signaling. In other words, an RRC message containing CORESET configuration information can be transmitted to the terminal via RRC signaling. The CORESET configuration information can indicate the frequency resource of the CORESET within the BWP, the time resource of the CORESET, the period of the CORESET (in slot units), the position of the OFDM symbol of the CORESET within the slot, and the number of OFDM symbols of the CORESET within the slot. According to the 5G NR standard, the number of OFDM symbols that can be configured by the CORESET configuration information can be any one of one OFDM symbol, two consecutive OFDM symbols, or three consecutive OFDM symbols.

[0183] In the example of FIG. 8, the first CORESET (810) transmitted over one OFDM symbol length and the second CORESET (820) transmitted over three OFDM symbols length are exemplified, as exemplified in FIGS. 6 and 7 above.

[0184] According to the embodiment of FIG. 8, when the base station needs to extend the OFDM symbol length of the CORESET set by the RRC message, it can transmit an indicator or information for indicating the extension of the OFDM symbol length of the CORESET. As described in FIGS. 6 and 7, in the following description, for the convenience of explanation, the indicator or information for indicating whether to extend the CORESET is referred to as ADRAI.

[0185] According to the embodiment of FIG. 8, ADRAI may be composed of two REGs. One REG may be transmitted in each of the first OFDM symbol interval and the second OFDM symbol interval of the CORESET. In the embodiment of FIG. 8, ADRAI composed of two REGs may be transmitted in a specific frequency resource in the first OFDM symbol interval of the CORESET and in a specific frequency resource in the second OFDM symbol interval of the CORESET.

[0186] In the embodiment of FIG. 8, the two REGs through which ADRAI is transmitted may be one REG other than the CORESET that is closest to the subcarrier having the lowest index among the frequency resources of the CORESET in the first OFDM symbol interval of the CORESET, and one REG other than the CORESET that is closest to the subcarrier having the lowest index among the frequency resources of the CORESET in the second OFDM symbol interval of the CORESET. In other words, the two REGs through which ADRAI is transmitted may have the same frequency resources, and only the positions of the OFDM symbols may be different.

[0187] The frequency resource locations of the two REGs transmitting ADRAI are not limited to the form illustrated in FIG. 8. In other words, the frequency resource locations of the REGs transmitting ADRAI may take on various variations from FIG. 8. Examples of variations in the frequency resource locations of the REGs transmitting ADRAI can be exemplified by the following methods.

[0188] As a modified example of FIG. 8, the two REGs through which ADRAI is transmitted may be one REG that is not in the CORESET and is closest to the subcarrier with the highest index among the frequency resources of the CORESET in the first OFDM symbol interval of the CORESET, and one REG that is not in the CORESET and is closest to the subcarrier with the highest index among the frequency resources of the CORESET in the second OFDM symbol interval of the CORESET. In other words, the two REGs through which ADRAI is transmitted may have the same frequency resources, and only the positions of the OFDM symbols may be different.

[0189] As another variation of FIG. 8, the two REGs through which ADRAI is transmitted may be one REG having the lowest frequency index among the subcarriers excluding the CORESET in the first OFDM symbol interval of the CORESET, and one REG having the lowest frequency index among the subcarriers excluding the CORESET in the second OFDM symbol interval of the CORESET. In this case, the frequency resources of the two REGs through which ADRAI is transmitted may be the same, and the time resources of the two REGs may be consecutive OFDM resources.

[0190] As another modified example of FIG. 8, the two REGs through which ADRAI is transmitted may be one REG having the highest frequency index among the subcarriers excluding the CORESET in the first OFDM symbol interval of the CORESET, and one REG having the highest frequency index among the subcarriers excluding the CORESET in the second OFDM symbol interval of the CORESET. In this case, the frequency resources of the two REGs through which ADRAI is transmitted may be the same, and the time resources of the two REGs may be consecutive OFDM resources.

[0191] In the modified example of Fig. 8, the frequency resources of the two REGs through which ADRAI is transmitted are identical, and the time resources of the two REGs are continuous OFDM resources. However, in another modified example, the frequency resources and time resources of each of the two REGs through which ADRAI is transmitted may both be non-contiguous resources.

[0192] There may be many more examples where two REGs transmitting ADRAI as described above are not consecutive in frequency resources and time resources, and the present disclosure does not place any restrictions on this.

[0193] Meanwhile, the location of the ADRAI illustrated in FIG. 8 or the modified location of the ADRAI according to the modified example described above may be indicated by an RRC message. As another example, the location of the ADRAI illustrated in FIG. 8 or the modified location of the ADRAI according to the modified example described above may be predefined as a standard specification in a communication system.

[0194] According to the example of FIG. 8, when the first ADRAI (811, 812) indicating whether to extend the first CORESET (810) indicates the extension of the first CORESET (810), the first extended CORESET (813) can be transmitted in an OFDM symbol consecutive to the first CORESET (810).

[0195] Although the example of FIG. 8 illustrates a case where the first extended CORESET (813) is transmitted in an OFDM symbol that is consecutive to the first CORESET (810), the present disclosure is not limited thereto. In other words, the time resource in which the first extended CORESET (813) is transmitted may be modified in various ways.

[0196] As a modified example of FIG. 8, when the first ADRAI (811, 812) indicates the extension of the first CORESET (810), the time resource of the first extended CORESET (813) may be transmitted at an OFDM symbol position that is spaced apart by at least one OFDM symbol. The reason why the first extended CORESET (813) is transmitted at an OFDM symbol position that is spaced apart by at least one OFDM symbol from the symbol of the first CORESET (810) may be when considering the time required for the terminal to demodulate and decode the ADRAI.

[0197] As illustrated in FIG. 8, the frequency resources of the first extended CORESET (813) can be transmitted in the same frequency resources as the frequency resources of the first CORESET (810).

[0198] As described above, the base station can additionally configure the first extended CORESET (813) using the first ADRAI (811, 812). Accordingly, when the base station configures the first extended CORESET (812) to be transmitted using the first ADRAI (811, 812), the base station can transmit the PDCCH using the first CORESET (810) and the first extended CORESET (813). At this time, the PDCCH transmitted within the first CORESET (810) may be repeated within the first extended CORESET (813).

[0199] Next, the expansion of the second CORESET (820) is described. Referring to FIG. 8, the second ADRAI (821, 822) for indicating whether the second CORESET (820) is expanded can be transmitted in the first OFDM symbol and the second OFDM symbol among three consecutive OFDM symbols in the time dimension as described above. At this time, the frequency resources of the second ADRAI (821, 822) can have the same frequency resources, and the time resources can be transmitted in consecutive OFDM symbols as the first OFDM symbol and the second OFDM symbol. The location of the second ADRAI (821, 822) in the frequency resources can be variously modified as described above.

[0200] According to the example of FIG. 8, when the second ADRAI (821, 822) indicating whether to extend the second CORESET (820) indicates the extension of the second CORESET (820), the second extended CORESET (823) can be transmitted in an OFDM symbol consecutive to the second CORESET (820).

[0201] Although the example of FIG. 8 illustrates a case where the second extended CORESET (823) is transmitted in an OFDM symbol that is consecutive to the second CORESET (820), the present disclosure is not limited thereto. In other words, the time resource for transmitting the second extended CORESET (823) may also be subject to various modifications, similar to the case where the first extended CORESET (813) is transmitted above.

[0202] Additionally, the frequency resources of the second extended CORESET (823) can be transmitted in the same frequency resources as the frequency resources of the second CORESET (820).

[0203] Meanwhile, since one REG through which ADRAI is transmitted follows the 5G NR standard, it can be composed of 12 REs. As illustrated in FIG. 8, one REG includes three DMRSs, so extended information on the OFDM symbol length of the CORESET can be transmitted using a total of 18 REs. Considering QPSK modulation, the codeword length using 18 REs can be 36 bits. In this way, the method of indicating the OFDM symbol length of the extended CORESET using the ADRAI codeword can be the same method as described above in FIG. 7.

[0204] The terminal can receive the PDCCH through the first CORESET (810) set by RRC. At this time, the terminal can check whether the first extended CORESET (813) is set by checking whether the ADRAI (811, 812) is received in the resource where the ADRAI is transmitted. If the ADRAI (811, 812) is received from the base station, the terminal can check the OFDM symbol length through which the first extended CORESET (813) is transmitted based on the received ADRAI (811, 812). On the other hand, if the ADRAI is not received from the base station, the terminal can interpret that only the first CORESET (810) is set. If the first extended CORESET (812) is set, the terminal can also check whether the PDCCH transmitted through the first CORESET (810) is repeatedly transmitted through the first extended CORESET (813).

[0205] In the above, only the case where the terminal monitors only the first CORESET (810) or monitors both the first CORESET (810) and the first extended CORESET (813) based on ADRAI (811, 812) that indicates the settings of the first CORESET (810) and the first extended CORESET (813) has been described.

[0206] The terminal may operate in the same manner even when it receives the second CORESET (820) based on ADRAI (821, 822) that instructs transmission of the second CORESET (820) and the second extended CORESET (823), or when it receives the second CORESET (820) and the second extended CORESET (823).

[0207] The embodiments of FIGS. 7 and 8 described above are cases where two or more REGs are allocated adjacent to the CORESET region. The reason for using multiple REGs may be to improve the reception reliability of extended OFDM symbol length information in the CORESET region in situations where the wireless channel conditions are poor. In other words, the cases of FIGS. 7 and 8 may be one method for coverage expansion.

[0208] Figure 9 is another conceptual diagram for explaining the transmission of information indicating whether to expand the CORESET area using two REGs in one BWP and the case where the CORESET is expanded.

[0209] Referring to Fig. 9, one slot (902) is illustrated in a BWP (901) allocated to a specific terminal. The OFDM symbol in Fig. 9 is a case where it has a normal CP, and one slot (902) may be composed of 14 OFDM symbols.

[0210] The base station can transmit CORESET configuration information to each terminal via RRC signaling. In other words, an RRC message including CORESET configuration information can be transmitted to the terminal via RRC signaling. The CORESET configuration information can indicate at least one of a frequency resource of the CORESET within the BWP, a time resource of the CORESET, a period of the CORESET (in slot units), a position of an OFDM symbol of the CORESET within a slot, or the number of OFDM symbols of the CORESET within a slot. According to the 5G NR standard, the number of OFDM symbols that can be configured by the CORESET configuration information can be any one of one OFDM symbol, two consecutive OFDM symbols, or three consecutive OFDM symbols.

[0211] In the example of FIG. 9, a first CORESET (910) transmitted over a length of one OFDM symbol and a second CORESET (920) transmitted over a length of three OFDM symbols are illustrated.

[0212] When the base station needs to extend the OFDM symbol length of the CORESET established by the RRC message, it can transmit an indicator or information to indicate the extension of the OFDM symbol length of the CORESET. In the following description, for convenience of explanation, the indicator or information indicating whether to extend the CORESET is referred to as ADRAI.

[0213] According to the embodiment of FIG. 9, ADRAI may be composed of two REGs. An ADRAI composed of two REGs may be transmitted in the first OFDM symbol regardless of the OFDM symbol length of the CORESET configured in RRC. In addition, an ADRAI composed of two REGs may be located within the CORESET frequency resource defined by the RRC message. Therefore, as illustrated in FIG. 9, when an ADRAI is composed of two different REGs within the CORESET frequency resource defined by the RRC message, the frequency resource of the CORESET may have a frequency resource that is two REGs less than that of other OFDM symbols of the CORESET in which the ADRAI is not transmitted.

[0214] To address this issue, additional CORESETs may be allocated to OFDM symbols of the CORESET in which ADRAI is transmitted. In the embodiment of FIG. 9, additional CORESETs may be further allocated to OFDM symbols of the CORESET in which ADRAI is transmitted based on the same method as the method of allocating ADRAI in FIG. 8.

[0215] As illustrated in the example of Fig. 9, the additional CORESET is exemplified in the case where the two most adjacent REGs, not part of the CORESET, are allocated among the subcarriers with the highest frequency index among the subcarriers in the first OFDM symbol interval of the CORESET. Therefore, the additional CORESET can be modified in various forms based on the same method as the method of assigning ADRAI.

[0216] According to the example of Fig. 9, the first ADRAI (911, 912) for indicating whether the first CORESET (910) is expanded and the second ADRAI (921, 922) for indicating whether the second CORESET (920) is expanded are illustrated. The frequency dimension position of the first ADRAI (911, 912) and / or the frequency dimension position of the second ADRAI (921, 922) can be calculated by a method as in the following mathematical expression 1.

[0217]

[0218] In mathematical expression 1, R(0) can indicate the position of the first REG (911, 921) in the frequency domain of CORESET, and R(1) can indicate the position of the second REG (912, 922) in the frequency domain of CORESET. In mathematical expression 1, M is a value that can change the position of the first REG and can be set to zero (0) or a cell identifier (cell identification (ID). The cell ID can be a common ID used by multiple terminals. In the example of Fig. 9, the value of M can be "0". In other words, R(0) can be a case where the REG of the starting position of CORESET in the frequency resource is set to the first ADRAI (911) of the first ADRAI (911, 912).

[0219] In mathematical expression 1, N may represent the number of REGs in the frequency dimension of CORESET, and n may be a value for determining the degree of dispersion between R(0) and R(1) of the first ADRAI (911, 912). The value of n may be set to an integer value greater than or equal to 2. Therefore, as the value of n increases, the REGs of R(0) and R(1) may have closer positions.

[0220] In the case of mathematical expression 1, it may be the case that ADRAI is transmitted in one OFDM symbol interval within a CORESET using two REGs. If ADRAI is transmitted in one OFDM symbol interval within a CORESET using three or more REGs, the frequency resource location of each REG constituting ADRAI may be determined as in mathematical expression 2 below.

[0221]

[0222] In mathematical expression 2, the value of n can be an integer equal to or greater than the total number of REGs located in the frequency domain of CORESET.

[0223] Based on the above description, the positions of the first REG R(0) and the second REG R(1) of the first ADRAI (911, 912) in the first CORESET (910) consisting of one OFDM symbol can be calculated based on the mathematical expression 1 above. In the embodiment of FIG. 9, the first ADRAI (911, 912) may indicate that the CORESET is extended by the length of one OFDM symbol. When the first ADRAI (911, 912) indicates that the CORESET is extended by the length of one OFDM symbol, the first extended CORESET (913) may be transmitted in consecutive OFDM symbols of the first CORESET (910). The first extended CORESET (913) may have the same frequency resources as the CORESET frequency resources defined by the RRC message. Therefore, according to the example of FIG. 9, the first extended CORESET (913) may have a frequency resource that is two REGs less than the frequency resource of the first CORESET (910) to which the first ADRAI (911, 912) is transmitted.

[0224] Meanwhile, since one REG through which ADRAI is transmitted follows the 5G NR standard, it can be composed of 12 REs. As illustrated in FIG. 8, one REG includes three DMRSs, so extended information on the OFDM symbol length of the CORESET can be transmitted using a total of 18 REs. Considering QPSK modulation, the codeword length using 18 REs can be 36 bits. In this way, the method of indicating the OFDM symbol length of the extended CORESET using the ADRAI codeword can be the same method as described above in FIG. 7.

[0225] The base station can transmit control information (e.g., DCI) to the terminal via the first CORESET (910) and the first extended CORESET (913). In other words, the base station can transmit the PDCCH to the terminal via the first CORESET (910) and the first extended CORESET (913). At this time, at least a portion of the control information (e.g., DCI) transmitted via the first CORESET (910) may be repeatedly transmitted via the first extended CORESET (913).

[0226] The configuration of the second CORESET (920) can also be understood in the same way as the first CORESET (910).

[0227] More specifically, in the second CORESET (920) consisting of three OFDM symbols, the positions of the first REG R(0) and the second REG R(1) of the second ADRAI (921, 922) can be calculated based on the mathematical expression 1 above. In the second CORESET (920) consisting of three OFDM symbols, the second ADRAIs (921, 922) can all be arranged in the frequency resources of the first OFDM symbol. Therefore, the frequency resources of the remaining OFDM symbols, excluding the position of the first OFDM symbol in which the second ADRAI (921, 922) is transmitted in the second CORESET (920), can have the size of the CORESET frequency resource defined by the RRC message. In other words, the frequency resource of the first OFDM symbol in which the second ADRAI (921, 922) is transmitted in the second CORESET (920) can be allocated two REGs more frequency resource than the frequency resource of the CORESET of other OFDM symbols in the second CORESET (920).

[0228] In the embodiment of FIG. 9, the second ADRAI (921, 922) may indicate that the CORESET is extended by the length of one OFDM symbol. If the second ADRAI (921, 922) indicates that the second CORESET (921) is extended by the length of one OFDM symbol, the second extended CORESET (923) may be transmitted in consecutive OFDM symbols after three consecutive OFDM symbols of the second CORESET (920). The second extended CORESET (923) may have a size of the CORESET frequency resource defined by the RRC message. Therefore, according to the example of FIG. 9, the extended CORESET (923) may have a frequency resource that is two REGs less than the frequency resource of the first OFDM symbol of the second CORESET (920) in which the second ADRAI (921, 922) is transmitted.

[0229] Meanwhile, the terminal can receive the PDCCH through the first CORESET (910) set by RRC. At this time, the terminal can check whether the first extended CORESET (913) is set by checking whether the ADRAI (911, 912) is received in the resource where the ADRAI is transmitted. If the ADRAI (911, 912) is received from the base station, the terminal can check the OFDM symbol length through which the first extended CORESET (913) is transmitted based on the received ADRAI (911, 912). On the other hand, if the ADRAI is not received from the base station, the terminal can interpret that only the first CORESET (910) is set. If the first extended CORESET (912) is set, the terminal can also check whether the PDCCH transmitted through the first CORESET (910) is repeatedly transmitted through the first extended CORESET (913).

[0230] The terminal may operate in the same manner even when it receives the second CORESET (920) based on ADRAI (921, 922) that instructs transmission of the second CORESET (920) and the second extended CORESET (923), or when it receives the second CORESET (920) and the second extended CORESET (923).

[0231] On the other hand, the base station can indicate the extended activation of CORESET in advance through higher layer signaling (e.g., RRC message). If the base station indicates the extended activation of CORESET through higher layer signaling, the terminal can check the additional CORESET of the first OFDM symbol of the first CORESET (910) and / or the second CORESET (920) only when the extended activation of CORESET is indicated. On the other hand, if the base station does not indicate the extended activation of CORESET in advance through higher layer signaling (e.g., RRC message), the terminal can always check the additional CORESET of the first OFDM symbol of the first CORESET (910) and / or the second CORESET (920).

[0232] Figure 10 is another conceptual diagram for explaining the transmission of information indicating whether to expand the CORESET area using two REGs in one BWP and the case where the CORESET is expanded.

[0233] Referring to Fig. 10, one slot (1002) is illustrated in a BWP (1001) allocated to a specific terminal. The OFDM symbol in Fig. 10 has a normal CP, and one slot (1002) may be composed of 14 OFDM symbols.

[0234] The base station can transmit CORESET configuration information to each terminal via RRC signaling. In other words, an RRC message containing CORESET configuration information can be transmitted to the terminal via RRC signaling. The CORESET configuration information can indicate the frequency resource of the CORESET within the BWP, the time resource of the CORESET, the period of the CORESET (in slot units), the position of the OFDM symbol of the CORESET within the slot, and the number of OFDM symbols of the CORESET within the slot. According to the 5G NR standard, the number of OFDM symbols that can be configured by the CORESET configuration information can be any one of one OFDM symbol, two consecutive OFDM symbols, or three consecutive OFDM symbols.

[0235] In the example of FIG. 10, a first CORESET (1010) transmitted over a length of one OFDM symbol and a second CORESET (1020) transmitted over a length of three OFDM symbols are illustrated.

[0236] When the base station needs to extend the OFDM symbol length of the CORESET established by the RRC message, it can transmit an indicator or information to indicate the extension of the OFDM symbol length of the CORESET. In the following description, for convenience of explanation, the indicator or information indicating whether to extend the CORESET is referred to as ADRAI.

[0237] According to the embodiment of FIG. 10, ADRAI may be composed of two REGs. The ADRAI composed of two REGs may be transmitted in both the first OFDM symbol and the second OFDM symbol regardless of the OFDM symbol length of the CORESET configured in RRC. In addition, at least one REG of the ADRAI composed of two REGs may be located within the CORESET frequency resource defined by the RRC message. Therefore, as illustrated in FIG. 10, at least one REG of the ADRAI may be a REG within the CORESET frequency resource defined by the RRC message. This is because, when the OFDM symbol length of the CORESET configured by RRC has a length of one OFDM symbol, a REG of the ADRAI configured within the CORESET and a REG other than the CORESET OFDM symbol may be allocated. In the example of Fig. 10, REG (1011) of ADRAI set within CORESET and REG (1012) that is not a CORESET OFDM symbol can have the same frequency resource.

[0238] Since the REG of ADRAI is set within the frequency resources of CORESET, the frequency resources of the OFDM symbol in which the REG of ADRAI is transmitted can have as many frequency resources as one REG, compared to other OFDM symbols of CORESET in which the ADRAI is not transmitted.

[0239] According to the embodiment of FIG. 10, one ADRAI (1011 or 1021) may be transmitted in the first OFDM symbol of CORESET (1010) and another ADRI (1012 or 1022) may be transmitted in the second OFDM symbol.

[0240] For the OFDM symbol of the CORESET in which ADRAI is transmitted, an additional CORESET may be set based on the method in which the ADRAI described in FIG. 8 is added or one of the modified examples of FIG. 8.

[0241] According to the example of Fig. 10, the first ADRAI (1011, 1012) for indicating whether the first CORESET (1010) is expanded and the second ADRAI (1021, 1022) for indicating whether the second CORESET (1020) is expanded are illustrated. The frequency dimension position of the first ADRAI (1011, 1012) and / or the frequency dimension position of the second ADRAI (1021, 1022) can be calculated by a method as in the following mathematical expression 3.

[0242]

[0243] As can be seen in FIG. 10 and mathematical equation 3, the frequency dimension positions of the first ADRAI (1011, 1012) and / or the second ADRAI (1021, 1022) are the same, so R(0) and R(1) can be expressed as the same value.

[0244] In mathematical expression 3, M is a value that can change the position of REG as described in mathematical expression 1, and may mean zero (0) or a cell ID. The cell ID may be a common ID used by multiple terminals.

[0245] In mathematical expression 3, the value N can mean the total number of REGs in the frequency dimension of CORESET.

[0246] Based on the above description, the location of frequency resources for REGs of the first ADRAI (1011, 1012) in the first CORESET (1010) consisting of one OFDM symbol can be calculated based on the above mathematical expression 3.

[0247] The example of Fig. 10 may be a case where the first ADRAI (1011, 1012) instructs the first CORESET (1010) to configure a first extended CORESET (1013) having a length of one OFDM symbol. If the first ADRAI (1011, 1012) instructs the CORESET to be extended by a length of one OFDM symbol, the first extended CORESET (1013) may be configured from consecutive OFDM symbols of the first CORESET (1010). The first extended CORESET (1013) may have frequency resources that are one REG larger than the size of the CORESET frequency resources defined by the RRC message.

[0248] A second CORESET (1020) having three consecutive OFDM symbol lengths may also be configured in the same manner. More specifically, the second ADRAI (1021, 1022) may be a case in which the second CORESET (1020) composed of three OFDM symbols is instructed to configure the second extended CORESET (1023) by one OFDM symbol length. If the second ADRAI (1021, 1022) indicates the CORESET extension by one OFDM symbol length, the second extended CORESET (1023) may be configured from consecutive OFDM symbols of the second CORESET (1020).

[0249] At this time, the first OFDM symbol interval and the second OFDM symbol interval in the second CORESET (1020) can be extended by one REG in frequency resources. And the third OFDM symbol interval of the second CORESET (1020) can have the size of the CORESET frequency resource defined by the RRC message. In addition, the interval of the second extended CORESET (1023) can have the size of the CORESET frequency resource defined by the RRC message.

[0250] Accordingly, the second CORESET (1020) of FIG. 10 illustrates a case where the first OFDM symbol interval and the second OFDM symbol interval are extended by one REG in frequency resources.

[0251] Meanwhile, the terminal can receive the PDCCH through the first CORESET (1010) set by RRC. At this time, the terminal can check whether the first extended CORESET (1013) is set by checking whether the ADRAI (1011, 1012) is received in the resource where the ADRAI is transmitted. If the ADRAI (1011, 1012) is received from the base station, the terminal can check the OFDM symbol length in which the first extended CORESET (1013) is transmitted based on the received ADRAI (1011, 1012). On the other hand, if the ADRAI is not received from the base station, the terminal can interpret that only the first CORESET (1010) is set. When the first extended CORESET (1012) is set, the terminal can also check whether the PDCCH transmitted through the first CORESET (1010) is repeatedly transmitted through the first extended CORESET (1013).

[0252] The terminal may operate in the same manner even when it receives the second CORESET (1020) based on ADRAI (1021, 1022) that instructs transmission of the second CORESET (1020) and the second extended CORESET (1023) or when it receives the second CORESET (1020) and the second extended CORESET (1023).

[0253] On the other hand, the base station can indicate extended activation of CORESET in advance through higher layer signaling (e.g., RRC message). If the base station indicates extended activation of CORESET through higher layer signaling, the terminal can check the additional CORESET of the first OFDM symbol and the second OFDM symbol of the first CORESET (1010) and / or the second CORESET (1020) only when the extended activation of CORESET is indicated. On the other hand, if the base station does not indicate extended activation of CORESET through higher layer signaling (e.g., RRC message) in advance, the terminal can always check the additional CORESET of the first OFDM symbol and the additional CORESET of the second OFDM symbol of the first CORESET (1010) and / or the second CORESET (1020).

[0254]

[0255] [Example 2]

[0256] A second embodiment of the present disclosure describes a case where information indicating whether a CORESET region is expanded is transmitted via upper layer signaling. In the following description, the message transmitted via upper layer signaling may be any one of an RRC configuration message, an RRC reconfiguration message, and / or a medium access control (MAC)-control element (CE) message. In the following description, for convenience of explanation, it is assumed that the CORESET expansion indication message is an RRC message. The RRC message may be any one of an RRC configuration message and / or an RRC reconfiguration message.

[0257] Figure 11 is a flowchart explaining a case where a base station provides CORESET setting information to a terminal.

[0258] In step S1100, it is possible to determine whether a specific CORESET is dynamically expanded. In step S1100, the specific CORESET may be a CORESET area set within a specific BWP. In other words, it is possible to determine whether to expand a CORESET within a BWP allocated to a specific terminal(s) as described in FIGS. 6 to 10 . Whether to expand a CORESET may be determined based on one or more of the cell coverage of the base station, the number of terminals within the cell, and / or the required communication delay time, as described above.

[0259] For example, the base station may determine whether to expand CORESET based on whether cell coverage has been expanded. As another example, the base station may determine whether to expand CORESET based on whether data channel transmission to a large number of terminals is required. Here, when determining whether to transmit data channels to a large number of terminals, the base station may determine whether to expand CORESET based on the number of terminals and / or the required data transmission rate. As another example, the base station may determine whether to expand CORESET based on the delay time requirements of the data provided to the terminals and / or the average data delay time of the base station.

[0260] In step S1102, the base station may generate an RRC message based on whether the CORESET dynamic extension has been determined. The RRC message may be either an RRC setup message and / or an RRC reset message as described above.

[0261] Some of the RRC messages according to the present disclosure can be exemplified as shown in Table 4 below.

[0262] ControlResourceSet Configuration… … Frequency Domain Resources Bit String (Size(45)) Duration (Time Domain) Integer (1,…,maxCoReSetDuration) / maxCoReSetDuration = 3 (OFDM symbols)… … Dynamic Control Resources ENUMERATED {enabled, disabled}

[0263] Table 4 may be an example of a case where the DynamicControlResources parameter is added to an RRC message. As illustrated in Table 4, the DynamicControlResources parameter may indicate whether it is enabled or disabled. If the DynamicControlResources parameter indicates that it is enabled, dynamic expansion of CORESET may be performed. On the other hand, if the DynamicControlResources parameter indicates that it is disabled, dynamic expansion of CORESET may not be performed.

[0264] Also, in Table 4, the duration parameter can mean the number of OFDM symbols in the time domain. When the maximum value of the duration parameter is set to 3 OFDM symbols as shown in Table 4, it can be in the same form as the existing NR standard. When the maximum value of the duration parameter is set to 3 OFDM symbols, the OFDM symbol extension value of CORESET can be set in the same way as described above in FIGS. 6 to 10.

[0265] As another example, the duration parameter may be set as shown in Table 5 below, including the OFDM symbol extension value of CORESET. Table 5 may be used to extend the parameter values ​​currently used in the 5G NR standard in a different way from Table 4 exemplified above.

[0266] ControlResourceSet Configuration… … Frequency Domain Resources Bit String (Size(45)) Duration (Time Domain) Integer (1,…,maxCoReSetDuration) / maxCoReSetDuration = 6 (OFDM symbols)… …

[0267] In Table 5, the duration parameter may indicate the number of OFDM symbols indicating the time dimension domain of CORESET. As previously explained, according to the current NR standard, the time dimension domain of CORESET may be limited to a maximum of 3 OFDM symbols. In the present disclosure, the maximum number of OFDM symbols in the time dimension domain of CORESET may be extended to p. Here, the value of p may be an integer greater than or equal to 4. In the example of Table 5, the value of p may be assumed to be 6. Therefore, according to the example of Table 5, the CORESET time dimension domain may be extended to a maximum of 6 OFDM symbols.

[0268] If the duration value indicating the CORESET time dimension area is 1, 2, or 3, this may be the same as the current NR specification, and if the duration value indicating the CORESET time dimension area is 4, 5, or 6, this may mean that additional dynamic resource allocation has occurred in the CORESET time dimension.

[0269] When using a method such as Table 4 and / or Table 5, the RRC message may further include frequency resource indication information on which ADRAI is transmitted. For example, as shown in FIG. 6 and / or FIG. 7 , the RRC message may further include information indicating which frequency resource the ADRAI is transmitted through in the first symbol. The frequency resource information may indicate the frequency resources of the REGs.

[0270] When using a method such as Table 4 and / or Table 5, the RRC message may further include time-frequency resource indication information for the ADRAI being transmitted. For example, the RRC message may further include frequency resource information for the REG for which the ADRAI is being transmitted and information indicating the location of the OFDM symbol, as illustrated in FIG. 8.

[0271] When using a method such as Table 4 and / or Table 5, the RRC message may provide parameters for calculating the time-frequency resources on which the ADRAI is transmitted. This may be information for using any one of Equations 1, 2, or 3 described above. In other words, the RRC message may further include parameters for calculating the resources on which the ADRAI is transmitted, as shown in FIGS. 9 and / or 10 . In addition, since a portion of the CORESET is used in the case of FIGS. 9 and / or 10 , the RRC message may further include information on additional resources of the CORESET.

[0272] In step S1102, the base station may generate an RRC message including the method as in Table 4 and / or Table 5 and the additional message described above.

[0273] In step S1104, the base station may transmit an RRC message to the terminal. In step S1104, the terminal may receive an RRC message from the base station. The RRC message received in step S1104 may include information from Table 4 and / or Table 5. In addition, the RRC message received in step S1104 may further include additional resource information described above. The terminal may determine whether CORESET is extended based on the RRC message received in step S1104. In addition, additional resource information may be confirmed.

[0274] In step S1108, the base station may establish a physical layer channel including CORESET based on the RRC message. The physical layer channel including CORESET may be any of the forms illustrated in FIGS. 6 to 10 or modified forms thereof.

[0275] In step S1110, the base station can transmit downlink control information (e.g., DCI) and downlink data via a physical layer channel. At this time, the downlink control information can be transmitted in any of the forms described in FIGS. 6 to 10 or modified forms thereof.

[0276] In step S1110, the terminal can receive downlink control information and downlink data via a physical layer channel based on the RRC message received in step S1106. In other words, the terminal can receive downlink control information via an extended CORESET, and can receive downlink data based on the downlink control information.

[0277]

[0278] [Example 3]

[0279] Below, a third embodiment according to the present disclosure is described. The first and second embodiments described above may not be applicable when CORESET expansion occurs during the initial connection procedure. Therefore, the following describes a case where CORESET expansion occurs during the initial connection procedure.

[0280] At least one of the methods described in FIGS. 6 through 10 for determining whether a terminal has extended CORESET during the initial connection procedure may be established as a wireless communication standard. For example, any of the methods of FIG. 6 or the modified embodiments of FIG. 6 may be established as a wireless communication standard.

[0281] A base station can periodically broadcast a synchronization signal block (SSB), and based on information set in the SSB (e.g., MIB included in the SSB), the base station can periodically broadcast CORESET 0 (hereinafter, referred to as "initial access CORESET" for convenience of explanation) for an initial access terminal. In addition, the base station can periodically transmit a DCI for scheduling SIB1 to the terminal through the initial access CORESET, and can transmit information about a system information block (SIB) (e.g., SIB1) to the terminal through a PDSCH indicated by the DCI. At this time, the base station may need to extend the initial access CORESET based on any one of the following reasons: expansion of the base station's coverage, transmission of a large number of terminals, delay in data transmission, or increase in error rate, as described above.

[0282] If an extension of the initial connection CORESET is required, the base station can configure ADRAI as a CORESET extension as described in the embodiment of FIG. 6. The base station can transmit the initial connection CORESET and ADRAI. The configuration information of the initial connection CORESET and the ADRAI can be included in the MIB. If ADRAI is configured, the base station can transmit control information to the terminal through the initial connection CORESET and the extended CORESET. In addition, as described above, at least some of the control information transmitted through the extended CORESET may be a repetition of the information transmitted in the initial connection CORESET.

[0283] Meanwhile, the terminal can receive the SSB transmitted by the base station during the cell search procedure. The terminal can obtain the starting position information of the initial access CORESET based on the received SSB. The terminal can receive control information through the initial access CORESET based on the obtained starting position information of the initial access CORESET. At this time, since the standard defines that the ADRAI is transmitted in one of the methods described in FIG. 6 as assumed above, the terminal can attempt to receive the REG for the initial access CORESET and ADRAI.

[0284] If ADRAI is received, the terminal can recognize that the initial connection CORESET and extended COREST are established. Furthermore, the terminal can determine the number of OFDM symbols over which the extended CORSET is transmitted based on Table 2 and / or Table 3 above. Conversely, if ADRAI is not received, the terminal can receive control information, such as SIB1, only through the initial connection CORESET.

[0285] In the above embodiments, the expansion of the initial connection CORESET has been described through one embodiment illustrated in FIG. 6. However, even if any of the methods illustrated in FIGS. 7 to 10 are used based on the method described above, the above procedure described using FIG. 6 can be applied in the same manner.

[0286] On the other hand, in the first to third embodiments described above, ADRAI may only indicate whether to extend the CORESET and / or the initial connection CORESET established by RRC. In this case, the extension may be performed by the number of OFDM symbols of the CORESET and / or the initial connection CORESET established by RRC.

[0287] For example, if the number of OFDM symbols in the CORESET is 1 and ADRAI is transmitted, the number of OFDM symbols in the extended CORESET may be 1. As another example, if the number of OFDM symbols in the CORESET is 2 and ADRAI is transmitted, the number of OFDM symbols in the extended CORESET may be 2. As another example, if the number of OFDM symbols in the CORESET is 3 and ADRAI is transmitted, the number of OFDM symbols in the extended CORESET may be 3.

[0288] If the above content is adopted as a wireless communication standard, ADRAI may not need to indicate the number of OFDM symbols of the extended CORESET.

[0289] The operations of the method according to the embodiments of the present disclosure can be implemented as a computer-readable program or code on a computer-readable recording medium. A computer-readable recording medium includes any type of recording device that stores information readable by a computer system. Furthermore, a computer-readable recording medium can be distributed across network-connected computer systems, allowing the computer-readable program or code to be stored and executed in a distributed manner.

[0290] Additionally, the computer-readable recording medium may include hardware devices specifically configured to store and execute program instructions, such as ROM, RAM, flash memory, etc. The program instructions may include not only machine language codes produced by a compiler, but also high-level language codes that can be executed by a computer using an interpreter, etc.

[0291] While some aspects of the present disclosure have been described in the context of a device, they may also represent a description of a corresponding method, wherein a block or device corresponds to a method step or a feature of a method step. Similarly, aspects described in the context of a method may also be described as a corresponding block or item or a feature of a corresponding device. Some or all of the method steps may be performed by (or using) a hardware device, such as, for example, a microprocessor, a programmable computer, or an electronic circuit. In some embodiments, at least one or more of the most important method steps may be performed by such a device.

[0292] In embodiments, a programmable logic device (e.g., a field-programmable gate array) may be used to perform some or all of the functions of the methods described herein. In embodiments, the field-programmable gate array may operate in conjunction with a microprocessor to perform one of the methods described herein. In general, the methods are preferably performed by some hardware device.

[0293] Although the present disclosure has been described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various modifications and changes may be made to the present disclosure without departing from the spirit and scope of the present disclosure as set forth in the claims below.

Claims

1. In the terminal method, A step of receiving first control information through a control resource set (CORESET) resource within a bandwidth part (BWP) allocated from a base station; A step of receiving additional dynamic resource allocation information (ADRAI) indicating expansion of the CORESET from the base station through an ADRAI resource; A step of receiving second control information from the base station through an extended CORESET based on the ADRAI; and A step of receiving data from the base station based on the first control information and the second control information, Terminal method.

2. In claim 1, The above ADRAI resources are: A resource of the first orthogonal frequency division multiplexing (OFDM) symbol section of the CORESET on the time axis, and a resource of one resource element group (REG) other than the CORESET resource among the frequency resources closest to the subcarrier having the lowest index of the CORESET on the frequency axis, or A resource of the first OFDM symbol section among the CORESET resources on the time axis, and one REG other than the CORESET among the frequency resources most adjacent to the subcarrier having the highest index among the CORESET frequency resources on the frequency axis. Terminal method.

3. In claim 1, The above ADRAI resources are: A resource of the first orthogonal frequency division multiplexing (OFDM) symbol section among the CORESET resources on the time axis, and is composed of a first resource element group (REG) that is not the CORESET among the frequency resources that are most adjacent to the subcarrier having the lowest index of the CORESET on the frequency axis, and a second REG that is most adjacent to the first REG among the REGs that are not the CORESET, or It is a resource of the first OFDM symbol section of the CORESET on the time axis, and is composed of a third REG that is not the CORESET among the frequency resources that are most adjacent to the subcarrier having the highest index among the CORESET frequency resources on the frequency axis, and a fourth REG that is most adjacent to the third REG among the REGs that are not the CORESET. Terminal method.

4. In claim 1, The above extended CORESET is composed of one or more orthogonal frequency division multiplexing (OFDM) symbols consecutive to the CORESET. Terminal method.

5. In claim 1, The above extended CORESET is set at a position spaced apart from the CORESET by a preset number of orthogonal frequency division multiplexing (OFDM) symbols. Terminal method.

6. In claim 1, The above extended CORESET is indicated by the ADRAI in units of the number of orthogonal frequency division multiplexing (OFDM) symbols. Terminal method.

7. In claim 1, At least some of the second control information is repeated information of the first control information, Terminal method.

8. In the terminal, At least one processor, wherein the terminal comprises: Receive first control information through a control resource set (CORESET) within a bandwidth part (BWP) allocated from a base station; Receive additional dynamic resource allocation information (ADRAI) indicating expansion of the CORESET from the base station through an ADRAI resource; Receive second control information from the base station through extended CORESET based on the above ADRAI; and Causing data to be received from the base station based on the first control information and the second control information, Terminal.

9. In claim 8, The above ADRAI resources are: A resource of the first orthogonal frequency division multiplexing (OFDM) symbol section of the CORESET on the time axis, and a resource of one resource element group (REG) other than the CORESET among the frequency resources that are closest to the subcarrier having the lowest index of the CORESET on the frequency axis, or A resource of the first OFDM symbol section of the CORESET on the time axis, and one REG other than the CORESET among the frequency resources most adjacent to the subcarrier having the highest index among the CORESET frequency resources on the frequency axis. Terminal.

10. In claim 8, The above ADRAI resources are: A resource of the first orthogonal frequency division multiplexing (OFDM) symbol section of the CORESET on the time axis, and is composed of a first resource element group (REG) that is not the CORESET among the frequency resources that are most adjacent to the subcarrier having the lowest index of the CORESET on the frequency axis, and a second REG that is most adjacent to the first REG among the REGs that are not the CORESET, or It is a resource of the first OFDM symbol section of the CORESET on the time axis, and is composed of a third REG that is not the CORESET among the frequency resources that are most adjacent to the subcarrier having the highest index among the CORESET frequency resources on the frequency axis, and a fourth REG that is most adjacent to the third REG among the REGs that are not the CORESET. Terminal.

11. In claim 8, The above extended CORESET is composed of one or more orthogonal frequency division multiplexing (OFDM) symbols consecutive to the CORESET. Terminal.

12. In claim 8, The above extended CORESET is set at a position spaced apart from the CORESET by a preset number of orthogonal frequency division multiplexing (OFDM) symbols. Terminal.

13. In claim 8, The above extended CORESET is indicated by the ADRAI in units of the number of orthogonal frequency division multiplexing (OFDM) symbols. Terminal.

14. In claim 8, At least some of the second control information is repeated information of the first control information, Terminal.

15. In the method of the base station, A step of transmitting first control information to the terminal through a control resource set (CORESET) within a bandwidth part (BWP) allocated to the terminal; A step of transmitting additional dynamic resource allocation information (ADRAI) indicating expansion of the CORESET to the terminal through an ADRAI resource when expansion of the CORESET is required; A step of transmitting second control information to the terminal through an extended CORESET based on the above ADRAI; and A step of transmitting data to the terminal based on the first control information and the second control information, Base station method.

16. In claim 15, The above ADRAI resources are: A resource of the first orthogonal frequency division multiplexing (OFDM) symbol section of the CORESET on the time axis, and a resource of one resource element group (REG) other than the CORESET among the frequency resources that are closest to the subcarrier having the lowest index of the CORESET on the frequency axis, or A resource of the first OFDM symbol section of the CORESET on the time axis, and one REG other than the CORESET among the frequency resources most adjacent to the subcarrier having the highest index among the CORESET frequency resources on the frequency axis. Base station method.

17. In claim 15, The above ADRAI resources are: A resource of the first orthogonal frequency division multiplexing (OFDM) symbol section of the CORESET on the time axis, and is composed of a first resource element group (REG) that is not the CORESET among the frequency resources that are most adjacent to the subcarrier having the lowest index of the CORESET on the frequency axis, and a second REG that is most adjacent to the first REG among the REGs that are not the CORESET, or It is a resource of the first OFDM symbol section of the CORESET on the time axis, and is composed of a third REG that is not the CORESET among the frequency resources that are most adjacent to the subcarrier having the highest index among the CORESET frequency resources on the frequency axis, and a fourth REG that is most adjacent to the third REG among the REGs that are not the CORESET. Base station method.

18. In claim 15, The above extended CORESET is composed of one or more orthogonal frequency division multiplexing (OFDM) symbols consecutive to the CORESET. Base station method.

19. In claim 15, The above extended CORESET is indicated by the ADRAI in units of the number of orthogonal frequency division multiplexing (OFDM) symbols. Base station method.

20. In claim 15, At least some of the second control information is repeated information of the first control information, Base station method.

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