KR20220035013A - Method and apparatus for performing data transmission and reception using a plurality of cells - Google Patents

Abstract

The present embodiments relate to a method for transmitting and receiving data using multiple cells and a device thereof. The method comprises the following steps of: receiving cross-carrier scheduling-related information for at least two cells; receiving scheduling information for a primary cell (PCell) or a primary secondary cell (PSCell) of the at least two cells from a secondary cell (SCell); and transmitting and receiving data based on the scheduling information.

Description

Method and apparatus for transmitting and receiving data using a plurality of cells

The present embodiments propose a method and apparatus for transmitting and receiving data using a plurality of cells in a next-generation radio access network (hereinafter, referred to as “New Radio [NR]”).

3GPP recently approved "Study on New Radio Access Technology", a study item for research on next-generation radio access technology (that is, 5G radio access technology), and based on this, RAN WG1 for NR (New Radio) Designs for a frame structure, channel coding & modulation, waveform & multiple access scheme, and the like are in progress. NR is required to be designed to satisfy various QoS requirements required for each segmented and detailed usage scenario as well as an improved data rate compared to LTE.

As representative usage scenarios of NR, eMBB (enhancement Mobile BroadBand), mMTC (massive machine type communication), and URLLC (Ultra Reliable and Low Latency Communications) have been defined. design is required.

Since each service requirement (usage scenario) has different requirements for data rates, latency, reliability, coverage, etc., through the frequency band constituting an arbitrary NR system As a method to efficiently satisfy the needs of each usage scenario, different numerology (eg, subcarrier spacing, subframe, TTI (Transmission Time Interval), etc.) based There is a need for a method for efficiently multiplexing a radio resource unit of

As part of this aspect, a design for efficiently transmitting and receiving data in a situation such as carrier aggregation (CA) or dual connectivity (DC) in NR is required.

Embodiments of the present disclosure may provide a method and apparatus for data transmission/reception using a plurality of cells capable of performing scheduling for a primary cell or a primary secondary cell through a secondary cell when a plurality of cells are used. .

In one aspect, the present embodiments provide a method for a terminal to transmit and receive data using a plurality of cells, the step of receiving cross-carrier scheduling related information for at least two or more cells, at least two or more cells Among them, a method comprising receiving scheduling information for a primary cell (PCell) or a primary secondary cell (PSCell) from a secondary cell (SCell) and transmitting and receiving data based on the scheduling information may be provided.

In another aspect, the present embodiments provide a method for a base station to control data transmission and reception using a plurality of cells, the step of transmitting cross-carrier scheduling related information for at least two or more cells, at least two or more cells Among them, a method comprising the steps of transmitting scheduling information for a primary cell (PCell) or a primary secondary cell (PSCell) through a secondary cell (SCell) and transmitting and receiving data based on the scheduling information can be provided. .

In another aspect, in the present embodiments, in a terminal performing data transmission and reception using a plurality of cells, a transmitter receives cross-carrier scheduling related information for at least two or more cells, and at least two or more cells Among them, a control unit for receiving scheduling information for a primary cell (PCell) or a primary secondary cell (PSCell) from a secondary cell (SCell), and a control unit for transmitting and receiving data based on the scheduling information by controlling the transmitting unit and the receiving unit A terminal may be provided.

In another aspect, the present embodiments, in a base station for controlling data transmission and reception using a plurality of cells, a receiver, transmits cross-carrier scheduling related information for at least two or more cells, and at least two or more cells Among them, a transmission unit for transmitting scheduling information for a primary cell (PCell) or a primary secondary cell (PSCell) through a secondary cell (SCell), and a control unit for controlling the transmission unit and the reception unit, including a control unit for transmitting and receiving data based on the scheduling information It is possible to provide a base station that

According to the present embodiments, in the case of using a plurality of cells, scheduling of the primary cell or the primary secondary cell is configured to be performed through the secondary cell, thereby enabling more efficient data transmission and reception. It is possible to provide a method and apparatus for transmitting and receiving data using the same.

1 is a diagram schematically illustrating a structure of an NR wireless communication system to which this embodiment can be applied.
2 is a diagram for explaining a frame structure in an NR system to which this embodiment can be applied.
3 is a diagram for explaining a resource grid supported by a radio access technology to which this embodiment can be applied.
4 is a diagram for explaining a bandwidth part supported by a radio access technology to which the present embodiment can be applied.
5 is a diagram exemplarily illustrating a synchronization signal block in a radio access technology to which the present embodiment can be applied.
6 is a diagram for explaining a random access procedure in a radio access technology to which this embodiment can be applied.
7 is a diagram for explaining CORESET.
8 is a diagram illustrating an example of symbol level alignment among different SCSs to which this embodiment can be applied.
9 is a diagram illustrating a conceptual example of a bandwidth part to which the present embodiment can be applied.
10 is a diagram illustrating a procedure in which a terminal performs data transmission/reception using a plurality of cells according to an embodiment.
11 is a diagram illustrating a procedure in which a base station controls data transmission/reception using a plurality of cells according to an embodiment.
12 to 14 are diagrams for explaining cross-carrier scheduling related information according to an embodiment.
15 is a diagram showing the configuration of a user terminal according to another embodiment.
16 is a diagram showing the configuration of a base station according to another embodiment.

Hereinafter, some embodiments of the present disclosure will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are indicated in different drawings. In addition, in describing the present embodiments, if it is determined that a detailed description of a related well-known configuration or function may obscure the gist of the present technical idea, the detailed description may be omitted. When "includes", "having", "consisting of", etc. mentioned in this specification are used, other parts may be added unless "only" is used. When a component is expressed in the singular, it may include a case in which the plural is included unless otherwise explicitly stated.

In addition, in describing the components of the present disclosure, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the elements from other elements, and the essence, order, order, or number of the elements are not limited by the terms.

In the description of the positional relationship of the components, when it is described that two or more components are "connected", "coupled" or "connected", two or more components are directly "connected", "coupled" or "connected" It should be understood that, however, two or more components and other components may be further “interposed” and “connected,” “coupled,” or “connected.” Here, other components may be included in one or more of two or more components that are “connected”, “coupled” or “connected” to each other.

In the description of the temporal flow relationship related to the components, the operation method or the production method, for example, the temporal precedence relationship such as "after", "after", "after", "before", etc. Alternatively, when a flow precedence relationship is described, it may include a case where it is not continuous unless "immediately" or "directly" is used.

On the other hand, when numerical values or corresponding information (eg, level, etc.) for a component are mentioned, even if there is no separate explicit description, the numerical value or the corresponding information is based on various factors (eg, process factors, internal or external shock, Noise, etc.) may be interpreted as including an error range that may occur.

A wireless communication system in the present specification refers to a system for providing various communication services such as voice and data packets using radio resources, and may include a terminal, a base station, or a core network.

The present embodiments disclosed below may be applied to a wireless communication system using various wireless access technologies. For example, the present embodiments are CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), SC-FDMA (single carrier frequency division multiple access) Alternatively, it may be applied to various radio access technologies such as non-orthogonal multiple access (NOMA). In addition, the wireless access technology may mean not only a specific access technology, but also a communication technology for each generation established by various communication consultation organizations such as 3GPP, 3GPP2, WiFi, Bluetooth, IEEE, and ITU. For example, CDMA may be implemented with a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA may be implemented with a radio technology such as global system for mobile communications (GSM)/general packet radio service (GPRS)/enhanced datarates for GSM evolution (EDGE). OFDMA may be implemented with a radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and evolved UTRA (E-UTRA). IEEE 802.16m is an evolution of IEEE 802.16e, and provides backward compatibility with a system based on IEEE 802.16e. UTRA is part of the universal mobile telecommunications system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) that uses evolved-UMTSterrestrial radio access (E-UTRA), and employs OFDMA in the downlink and SC- FDMA is employed. As such, the present embodiments may be applied to currently disclosed or commercialized radio access technologies, or may be applied to radio access technologies currently under development or to be developed in the future.

On the other hand, the terminal in the present specification is a comprehensive concept meaning a device including a wireless communication module that performs communication with a base station in a wireless communication system, WCDMA, LTE, NR, HSPA and IMT-2020 (5G or New Radio), etc. It should be interpreted as a concept including all of UE (User Equipment), MS (Mobile Station), UT (User Terminal), SS (Subscriber Station), wireless device, etc. in GSM. In addition, the terminal may be a user's portable device such as a smart phone depending on the type of use, and in a V2X communication system may mean a vehicle, a device including a wireless communication module in the vehicle, and the like. In addition, in the case of a machine type communication (Machine Type Communication) system, it may mean an MTC terminal, an M2M terminal, a URLLC terminal, etc. equipped with a communication module to perform machine type communication.

A base station or cell of the present specification refers to an end that communicates with a terminal in terms of a network, a Node-B (Node-B), an evolved Node-B (eNB), gNode-B (gNB), a Low Power Node (LPN), Sector, site, various types of antennas, base transceiver system (BTS), access point, point (eg, transmission point, reception point, transmission/reception point), relay node ), mega cell, macro cell, micro cell, pico cell, femto cell, RRH (Remote Radio Head), RU (Radio Unit), small cell (small cell), such as a variety of coverage areas. In addition, the cell may mean including a BWP (Bandwidth Part) in the frequency domain. For example, the serving cell may mean the Activation BWP of the UE.

In the various cells listed above, since there is a base station controlling one or more cells, the base station can be interpreted in two meanings. 1) in relation to the radio area, it may be the device itself providing a mega cell, a macro cell, a micro cell, a pico cell, a femto cell, or a small cell, or 2) may indicate the radio area itself. In 1), the devices providing a predetermined radio area are controlled by the same entity, or all devices interacting to form a radio area cooperatively are directed to the base station. A point, a transmission/reception point, a transmission point, a reception point, etc. become an embodiment of a base station according to a configuration method of a wireless area. In 2), the radio area itself in which signals are received or transmitted from the point of view of the user terminal or the neighboring base station may be indicated to the base station.

In the present specification, a cell is a component carrier having the coverage of a signal transmitted from a transmission/reception point or a signal transmitted from a transmission/reception point (transmission point or transmission/reception point), and the transmission/reception point itself. can

The uplink (Uplink, UL, or uplink) refers to a method of transmitting and receiving data by the terminal to the base station, and the downlink (Downlink, DL, or downlink) refers to a method of transmitting and receiving data to the terminal by the base station do. Downlink may mean a communication or communication path from a multi-transmission/reception point to a terminal, and uplink may mean a communication or communication path from a terminal to a multi-transmission/reception point. In this case, in the downlink, the transmitter may be a part of multiple transmission/reception points, and the receiver may be a part of the terminal. In addition, in the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of the multi-transmission/reception point.

The uplink and the downlink transmit and receive control information through a control channel such as a Physical Downlink Control CHannel (PDCCH) and a Physical Uplink Control CHannel (PUCCH), and a Physical Downlink Shared CHannel (PDSCH), a Physical Uplink Shared CHannel (PUSCH), etc. Data is transmitted and received by configuring the same data channel. Hereinafter, a situation in which signals are transmitted/received through channels such as PUCCH, PUSCH, PDCCH, and PDSCH may be expressed in the form of 'transmitting and receiving PUCCH, PUSCH, PDCCH and PDSCH'.

For clarity of explanation, the present technical idea will be mainly described below for the 3GPP LTE/LTE-A/NR (New RAT) communication system, but the present technical characteristics are not limited to the corresponding communication system.

In 3GPP, after research on 4G (4th-Generation) communication technology, 5G (5th-Generation) communication technology is developed to meet the requirements of ITU-R's next-generation wireless access technology. Specifically, 3GPP develops LTE-A pro, which improved LTE-Advanced technology to meet the requirements of ITU-R as a 5G communication technology, and a new NR communication technology separate from 4G communication technology. LTE-A pro and NR both refer to 5G communication technology. Hereinafter, 5G communication technology will be described focusing on NR unless a specific communication technology is specified.

In the NR operation scenario, various operation scenarios were defined by adding consideration of satellites, automobiles, and new verticals to the existing 4G LTE scenarios. It is deployed in a range and supports the mMTC (Massive Machine Communication) scenario that requires a low data rate and asynchronous connection, and the URLLC (Ultra Reliability and Low Latency) scenario that requires high responsiveness and reliability and supports high-speed mobility. .

To satisfy this scenario, NR discloses a wireless communication system to which a new waveform and frame structure technology, low latency technology, mmWave support technology, and forward compatible technology are applied. In particular, in the NR system, various technological changes are presented in terms of flexibility in order to provide forward compatibility. The main technical features of NR will be described with reference to the drawings below.

<Normal NR system>

1 is a diagram schematically illustrating a structure of an NR system to which this embodiment can be applied.

1, the NR system is divided into a 5G Core Network (5GC) and an NR-RAN part, and the NG-RAN controls the user plane (SDAP/PDCP/RLC/MAC/PHY) and UE (User Equipment) It consists of gNBs and ng-eNBs that provide planar (RRC) protocol termination. gNB interconnection or gNB and ng-eNB interconnect via Xn interface. gNB and ng-eNB are each connected to 5GC through the NG interface. 5GC may be configured to include an Access and Mobility Management Function (AMF) in charge of a control plane such as terminal access and mobility control functions, and a User Plane Function (UPF) in charge of a control function for user data. NR includes support for both the frequency band below 6 GHz (FR1, Frequency Range 1) and the frequency band above 6 GHz (FR2, Frequency Range 2).

gNB means a base station that provides NR user plane and control plane protocol termination to a terminal, and ng-eNB means a base station that provides E-UTRA user plane and control plane protocol termination to a terminal. The base station described in this specification should be understood as encompassing gNB and ng-eNB, and may be used as a meaning to refer to gNB or ng-eNB separately if necessary.

<NR Waveform, Pneumologic and Frame Structure>

In NR, a CP-OFDM waveform using a cyclic prefix is used for downlink transmission, and CP-OFDM or DFT-s-OFDM is used for uplink transmission. OFDM technology is easy to combine with MIMO (Multiple Input Multiple Output), and has advantages of using a low-complexity receiver with high frequency efficiency.

On the other hand, in NR, since the requirements for data rate, delay rate, coverage, etc. are different for each of the three scenarios described above, it is necessary to efficiently satisfy the requirements for each scenario through the frequency band constituting an arbitrary NR system. . To this end, a technique for efficiently multiplexing a plurality of different numerology-based radio resources has been proposed.

Specifically, NR transmission numerology is determined based on sub-carrier spacing and cyclic prefix (CP), and the μ value is used as an exponential value of 2 based on 15 kHz as shown in Table 1 below. is changed negatively.

μ subcarrier spacing Cyclic prefix Supported for data Supported for synch 0 15 Normal Yes Yes One 30 Normal Yes Yes 2 60 Normal, Extended Yes No 3 120 Normal Yes Yes 4 240 Normal No Yes

As shown in Table 1 above, the NR numerology can be divided into five types according to the subcarrier spacing. This is different from the fact that the subcarrier interval of LTE, one of the 4G communication technologies, is fixed to 15 kHz. Specifically, in NR, subcarrier intervals used for data transmission are 15, 30, 60, and 120 kHz, and subcarrier intervals used for synchronization signal transmission are 15, 30, 12, 240 kHz. In addition, the extended CP is applied only to the 60 kHz subcarrier interval. On the other hand, as for the frame structure in NR, a frame having a length of 10 ms is defined, which is composed of 10 subframes having the same length of 1 ms. One frame can be divided into half frames of 5 ms, and each half frame includes 5 subframes. In the case of a 15 kHz subcarrier interval, one subframe consists of one slot, and each slot consists of 14 OFDM symbols. 2 is a diagram for explaining a frame structure in an NR system to which this embodiment can be applied.

Referring to FIG. 2 , a slot is fixedly composed of 14 OFDM symbols in the case of a normal CP, but the length of the slot in the time domain may vary according to the subcarrier interval. For example, in the case of a numerology having a 15 kHz subcarrier interval, the slot is 1 ms long and is configured with the same length as the subframe. On the other hand, in the case of numerology having a 30 kHz subcarrier interval, a slot consists of 14 OFDM symbols, but two slots may be included in one subframe with a length of 0.5 ms. That is, the subframe and the frame are defined to have a fixed time length, and the slot is defined by the number of symbols, so that the time length may vary according to the subcarrier interval.

Meanwhile, NR defines a basic unit of scheduling as a slot, and also introduces a mini-slot (or a sub-slot or a non-slot based schedule) in order to reduce transmission delay in a radio section. When a wide subcarrier interval is used, the length of one slot is shortened in inverse proportion, so that transmission delay in a radio section can be reduced. The mini-slot (or sub-slot) is for efficient support of the URLLC scenario and can be scheduled in units of 2, 4, or 7 symbols.

Also, unlike LTE, NR defines uplink and downlink resource allocation at a symbol level within one slot. In order to reduce the HARQ delay, a slot structure capable of transmitting HARQ ACK/NACK directly within a transmission slot has been defined, and this slot structure will be described as a self-contained structure.

NR is designed to support a total of 256 slot formats, of which 62 slot formats are used in 3GPP Rel-15. In addition, a common frame structure constituting an FDD or TDD frame is supported through a combination of various slots. For example, a slot structure in which all symbols of a slot are set to downlink, a slot structure in which all symbols are set to uplink, and a slot structure in which downlink symbols and uplink symbols are combined are supported. In addition, NR supports that data transmission is scheduled to be distributed in one or more slots. Accordingly, the base station may inform the terminal whether the slot is a downlink slot, an uplink slot, or a flexible slot using a slot format indicator (SFI). The base station may indicate the slot format by indicating the index of the table configured through UE-specific RRC signaling using SFI, and may indicate dynamically through DCI (Downlink Control Information) or statically or through RRC. It can also be ordered quasi-statically.

<NR Physical Resources>

In relation to a physical resource in NR, an antenna port, a resource grid, a resource element, a resource block, a bandwidth part, etc. are considered do.

An antenna port is defined such that a channel on which a symbol on an antenna port is carried can be inferred from a channel on which another symbol on the same antenna port is carried. When the large-scale property of a channel on which a symbol on one antenna port is carried can be inferred from a channel on which a symbol on another antenna port is carried, the two antenna ports are QC/QCL (quasi co-located or QC/QCL) It can be said that there is a quasi co-location) relationship. Here, the wide range characteristic includes one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

3 is a diagram for explaining a resource grid supported by a radio access technology to which this embodiment can be applied.

Referring to FIG. 3 , in the resource grid, since NR supports a plurality of numerologies on the same carrier, a resource grid may exist according to each numerology. In addition, the resource grid may exist according to an antenna port, a subcarrier interval, and a transmission direction.

A resource block consists of 12 subcarriers, and is defined only in the frequency domain. In addition, a resource element is composed of one OFDM symbol and one subcarrier. Accordingly, as in FIG. 3 , the size of one resource block may vary according to the subcarrier interval. In addition, NR defines "Point A" serving as a common reference point for a resource block grid, a common resource block, a virtual resource block, and the like.

4 is a diagram for explaining a bandwidth part supported by a radio access technology to which the present embodiment can be applied.

In NR, unlike LTE in which the carrier bandwidth is fixed at 20Mhz, the maximum carrier bandwidth is set from 50Mhz to 400Mhz for each subcarrier interval. Therefore, it is not assumed that all terminals use all of these carrier bandwidths. Accordingly, in NR, as shown in FIG. 4, a bandwidth part (BWP) may be designated within the carrier bandwidth and used by the terminal. In addition, the bandwidth part is associated with one neurology and is composed of a subset of continuous common resource blocks, and may be dynamically activated according to time. Up to four bandwidth parts are configured in the terminal, respectively, in uplink and downlink, and data is transmitted/received using the activated bandwidth part at a given time.

In the case of a paired spectrum, the uplink and downlink bandwidth parts are set independently, and in the case of an unpaired spectrum, to prevent unnecessary frequency re-tunning between downlink and uplink operations For this purpose, the downlink and uplink bandwidth parts are set in pairs to share a center frequency.

<NR Initial Connection>

In NR, the terminal accesses the base station and performs a cell search and random access procedure in order to perform communication.

Cell search is a procedure in which the terminal synchronizes with the cell of the corresponding base station using a synchronization signal block (SSB) transmitted by the base station, obtains a physical layer cell ID, and obtains system information.

5 is a diagram exemplarily illustrating a synchronization signal block in a radio access technology to which the present embodiment can be applied.

Referring to FIG. 5, the SSB consists of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) occupying 1 symbol and 127 subcarriers, respectively, and a PBCH spanning 3 OFDM symbols and 240 subcarriers.

The UE receives the SSB by monitoring the SSB in the time and frequency domains.

SSB can be transmitted up to 64 times in 5ms. A plurality of SSBs are transmitted using different transmission beams within 5 ms, and the UE performs detection on the assumption that SSBs are transmitted every 20 ms when viewed based on one specific beam used for transmission. The number of beams that can be used for SSB transmission within 5 ms time may increase as the frequency band increases. For example, up to 4 SSB beams can be transmitted in 3 GHz or less, and SSB can be transmitted using up to 8 different beams in a frequency band of 3 to 6 GHz and up to 64 different beams in a frequency band of 6 GHz or more.

Two SSBs are included in one slot, and the start symbol and the number of repetitions within the slot are determined according to the subcarrier interval as follows.

On the other hand, the SSB is not transmitted at the center frequency of the carrier bandwidth, unlike the SS of the conventional LTE. That is, the SSB may be transmitted in a place other than the center of the system band, and a plurality of SSBs may be transmitted in the frequency domain when wideband operation is supported. Accordingly, the UE monitors the SSB using a synchronization raster that is a candidate frequency location for monitoring the SSB. The carrier raster and synchronization raster, which are the center frequency location information of the channel for initial access, are newly defined in NR. Compared to the carrier raster, the synchronization raster has a wider frequency interval, so that the terminal can support fast SSB search. can

The UE may acquire the MIB through the PBCH of the SSB. MIB (Master Information Block) includes minimum information for the terminal to receive the remaining system information (RMSI, Remaining Minimum System Information) broadcast by the network. In addition, the PBCH includes information on the position of the first DM-RS symbol in the time domain, information for the UE to monitor SIB1 (eg, SIB1 neurology information, information related to SIB1 CORESET, search space information, PDCCH related parameter information, etc.), offset information between the common resource block and the SSB (the position of the absolute SSB in the carrier is transmitted through SIB1), and the like. Here, the SIB1 neurology information is equally applied to some messages used in the random access procedure for accessing the base station after the UE completes the cell search procedure. For example, the neurology information of SIB1 may be applied to at least one of messages 1 to 4 for the random access procedure.

The aforementioned RMSI may mean System Information Block 1 (SIB1), and SIB1 is periodically broadcast (eg, 160 ms) in the cell. SIB1 includes information necessary for the UE to perform an initial random access procedure, and is periodically transmitted through the PDSCH. In order for the UE to receive SIB1, it must receive neurology information used for SIB1 transmission and CORESET (Control Resource Set) information used for scheduling SIB1 through the PBCH. The UE checks scheduling information for SIB1 by using SI-RNTI in CORESET, and acquires SIB1 on PDSCH according to the scheduling information. SIBs other than SIB1 may be transmitted periodically or may be transmitted according to the request of the terminal.

6 is a diagram for explaining a random access procedure in a radio access technology to which this embodiment can be applied.

Referring to FIG. 6 , upon completion of cell search, the terminal transmits a random access preamble for random access to the base station. The random access preamble is transmitted through the PRACH. Specifically, the random access preamble is transmitted to the base station through a PRACH consisting of continuous radio resources in a specific slot that is periodically repeated. In general, when a UE initially accesses a cell, a contention-based random access procedure is performed, and when random access is performed for beam failure recovery (BFR), a contention-free random access procedure is performed.

The terminal receives a random access response to the transmitted random access preamble. The random access response may include a random access preamble identifier (ID), a UL grant (uplink radio resource), a temporary C-RNTI (Temporary Cell - Radio Network Temporary Identifier), and a Time Alignment Command (TAC). Since one random access response may include random access response information for one or more UEs, the random access preamble identifier may be included to inform which UE the included UL Grant, temporary C-RNTI, and TAC are valid. The random access preamble identifier may be an identifier for the random access preamble received by the base station. The TAC may be included as information for the UE to adjust uplink synchronization. The random access response may be indicated by a random access identifier on the PDCCH, that is, RA-RNTI (Random Access - Radio Network Temporary Identifier).

Upon receiving the valid random access response, the terminal processes information included in the random access response and performs scheduled transmission to the base station. For example, the UE applies the TAC and stores the temporary C-RNTI. In addition, data stored in the buffer of the terminal or newly generated data is transmitted to the base station by using the UL grant. In this case, information for identifying the terminal should be included.

Finally, the terminal receives a downlink message for contention resolution.

<NR CORESET>

The downlink control channel in NR is transmitted in a CORESET (Control Resource Set) having a length of 1 to 3 symbols, and transmits uplink/downlink scheduling information, SFI (Slot Format Index), and TPC (Transmit Power Control) information. .

As such, in NR, the concept of CORESET was introduced in order to secure the flexibility of the system. CORESET (Control Resource Set) means a time-frequency resource for a downlink control signal. The UE may decode the control channel candidates by using one or more search spaces in the CORESET time-frequency resource. Quasi CoLocation (QCL) assumptions for each CORESET are set, and this is used for the purpose of notifying the characteristics of the analog beam direction in addition to the delay spread, Doppler spread, Doppler shift, and average delay, which are characteristics assumed by the conventional QCL.

7 is a diagram for explaining CORESET.

Referring to FIG. 7 , CORESET may exist in various forms within a carrier bandwidth within one slot, and CORESET may consist of up to three OFDM symbols in the time domain. In addition, CORESET is defined as a multiple of 6 resource blocks up to the carrier bandwidth in the frequency domain.

The first CORESET is indicated through the MIB as part of the initial bandwidth part configuration to receive additional configuration information and system information from the network. After connection establishment with the base station, the terminal may receive and configure one or more pieces of CORESET information through RRC signaling.

In the present specification, frequencies, frames, subframes, resources, resource blocks, regions, bands, subbands, control channels, data channels, synchronization signals, various reference signals, various signals or various messages related to NR (New Radio) can be interpreted in various meanings used in the past or present or used in the future.

The present disclosure is not only applied to 5G or NR technology, which is a next-generation wireless communication technology, but also may be substantially equally applied to various wireless communication technologies, such as 4G and Wifi, as long as it does not contradict the technical idea.

New Radio (NR)

Recently, NR conducted in 3GPP was designed to satisfy various QoS requirements required for each segmented and detailed service requirement (usage scenario) as well as an improved data rate compared to LTE. In particular, eMBB (enhancement Mobile BroadBand), mMTC (massive machine type communication), and URLLC (Ultra Reliable and Low Latency Communications) are defined as typical usage scenarios of NR. As a method to satisfy the requirement, a frame structure design that is flexible compared to LTE is required.

Frequency constituting an arbitrary NR system because each service requirement (usage scenario) has different requirements for data rates, latency, reliability, coverage, etc. A radio resource unit based on different numerology (eg, subcarrier spacing, subframe, TTI, etc.) as a method for efficiently satisfying the needs of each service requirement (usage scenario) through the band It is designed to efficiently multiplex the

As one method for this, TDM, FDM or TDM/FDM-based through one or a plurality of NR component carriers (s) for numerology with different subcarrier spacing values Discussion was made on a method of supporting by multiplexing to and supporting one or more time units in configuring a scheduling unit in a time domain. In this regard, in NR, a subframe is defined as a type of time domain structure, and reference numerology for defining the subframe duration is used. As a result, it was decided to define a single subframe duration composed of 14 OFDM symbols of the same 15 kHz Sub-Carrier Spacing (SCS)-based normal CP overhead as LTE. Accordingly, in NR, a subframe has a duration of 1 ms. However, unlike LTE, the NR subframe is an absolute reference time duration, and a slot and a mini-slot as a time unit that is the basis of actual uplink/downlink data scheduling. ) can be defined. In this case, the number of OFDM symbols constituting the corresponding slot, the y value, is determined to have a value of y=14 regardless of the SCS value in the case of a normal CP.

Accordingly, any slot consists of 14 symbols, and according to the transmission direction of the slot, all symbols are used for downlink transmission (DL transmission), or all symbols are used for uplink transmission (UL). transmission), or may be used in the form of a downlink portion (DL portion) + a gap + an uplink portion (UL portion).

In addition, a mini-slot composed of a smaller number of symbols than the slot is defined in an arbitrary numerology (or SCS), and based on this, a short time domain scheduling interval for uplink/downlink data transmission/reception (time-domain) is defined. scheduling interval) may be set, or a long time-domain scheduling interval for uplink/downlink data transmission/reception may be configured through slot aggregation.

In particular, in the case of transmission and reception of latency critical data such as URLLC, 1ms (14 symbols) defined in a numerology-based frame structure with a small SCS value such as 15kHz When scheduling is performed in units of slots, it may be difficult to satisfy the latency requirement. For this purpose, a mini-slot composed of fewer OFDM symbols than the corresponding slot is defined, and based on this, it is critical to the same latency as the URLLC. It can be defined so that scheduling of (latency critical) data is performed.

Alternatively, as described above, by multiplexing and supporting numerology having different SCS values in one NR carrier in the TDM and/or FDM scheme, each numerology A method of scheduling data according to a latency requirement based on a defined slot (or mini-slot) length is also being considered. For example, when the SCS is 60 kHz as shown in FIG. 8 below, since the symbol length is reduced by about 1/4 compared to the case of SCS 15 kHz, if one slot is configured with 14 OFDM symbols, the corresponding 15 kHz-based The slot length becomes 1 ms, whereas the slot length based on 60 kHz is reduced to about 0.25 ms.

As such, in NR, by defining different SCS or different TTI lengths, a discussion is ongoing on a method of satisfying the requirements of URLLC and eMBB, respectively.

Wider bandwidth operations

In the case of the existing LTE system, a scalable bandwidth operation for an arbitrary LTE CC (Component Carrier) was supported. That is, according to a frequency distribution scenario (deployment scenario), any LTE operator was able to configure a bandwidth of at least 1.4 MHz to a maximum of 20 MHz in configuring one LTE CC, and a normal LTE terminal is one LTE For CC, the transmit/receive capability of 20 MHz bandwidth was supported.

However, in the case of NR, the design is made to enable support for NR terminals having different transmission/reception bandwidth capabilities through one wideband NR CC. By configuring one or more bandwidth parts (BWP, bandwidth part(s)) composed of a segmented bandwidth for an arbitrary NR CC, flexible (bandwidth part configuration) and activation (activation) different for each terminal It is required to support a wider bandwidth operation that is flexible.

Specifically, in NR, one or more bandwidth parts may be configured through one serving cell configured from the viewpoint of the terminal, and the terminal may configure one downlink bandwidth part in the corresponding serving cell (serving cell). DL bandwidth part) and one uplink bandwidth part (UL bandwidth part) were activated and defined to be used for uplink/downlink data transmission/reception. In addition, when a plurality of serving cells are configured in the corresponding terminal, that is, one downlink bandwidth part and/or uplink bandwidth part is activated for each serving cell even for a terminal to which CA is applied. Thus, it is defined to be used for uplink/downlink data transmission/reception by using the radio resource of the corresponding serving cell.

Specifically, an initial bandwidth part for an initial access procedure of a terminal is defined in an arbitrary serving cell, and one or more terminal specific (UE) through dedicated RRC signaling for each terminal -specific) A bandwidth part(s) is configured, and a default bandwidth part for a fallback operation may be defined for each terminal.

However, a plurality of downlink and/or uplink bandwidth parts are activated and used at the same time according to the configuration of the terminal's capability and bandwidth part(s) in an arbitrary serving cell. However, in NR rel-15, it is defined to activate and use only one downlink bandwidth part (DL bandwidth part) and an uplink bandwidth part (UL bandwidth part) at any time in any terminal. .

Carrier Aggregation (CA)

A carrier aggregation (CA) technology is a technology for boosting a data rate for a terminal through an additional cell. In the conventional CA technology, an RRC connection is configured in a terminal, a cell that is a reference for handover is set as a primary cell (PCell), and a cell that transmits and receives data by additionally allocating radio resources to the terminal is a secondary cell (SCell). can be set. However, in the conventional CA technology, when the base station configures the secondary cell in the terminal, the secondary cell state is determined in consideration of the measurement report information of the terminal after the secondary cell is configured in an inactive state.

That is, in the carrier aggregation process, the configuration procedure for configuring the secondary cell and the operation for controlling the secondary cell state of the configured secondary cell are separated, and there is a time delay. On the other hand, the state of the secondary cell may be divided into activation or deactivation, but the setting of the state may be made other than activation and deactivation. That is, the state of the secondary cell is described based on the case where it is divided into activation and deactivation, but is not limited thereto, and when the additional state is determined according to the state setting of the base station or the terminal, the secondary cell state including the additional state can be determined.

Dual Connectivity (DC)

Dual connectivity refers to an operation in which an RRC-connected (RRC_CONNECTED) terminal uses radio resources provided by at least two different network points (eg, Master eNB and Secondary eNBs) connected by non-ideal backhaul. In dual connectivity, the master base station (Master eNB) refers to a base station that terminates S1-MME and acts as a mobility anchor toward the core network (CN). A Master eNB may be referred to as a master base station or MeNB or a Macro eNB or a macrocell eNB. In dual connectivity, a secondary eNB is a base station that provides additional radio resources for a terminal and refers to a base station other than the master eNB. Secondary eNB may be referred to as a secondary base station or SeNB or small cell eNB or Small eNB or Assisting eNB. In this case, the group of serving cells associated with the MeNB is referred to as a Master Cell Group (MCG), and the group of serving cells associated with the SeNB is referred to as a Secondary Cell Group (SCG). Here, the associated serving cells may mean serving cells provided by the corresponding base station.

The SeNB has one special cell containing at least PUCCH. That is, at least one serving cell associated with the SeNB has a configured uplink. And one of them is configured with a PUCCH resource.

DSS (Dynamic Spectrum Sharing)

With the evolution of wireless mobile communication systems, operators are interested in refarming arbitrary LTE frequency bands and utilizing them as NRs. In the process, the DSS technology used for NR signal transmission and reception using some idle resources of the corresponding LTE frequency band was defined through rel-15. Specifically, as a method for transmitting and receiving NR DL or UL signals through any LTE DL subframe or LTE UL subframe of an LTE frequency band, in particular, in the case of an LTE DL subframe, PDCCH transmission is performed in a control region (control region) And a method for transmitting an NR DL signal through the remaining REs except for CRS transmission resource elements (REs) has been defined.

As described above for efficient migration from LTE to NR, a design for DSS technology that uses some radio resources in an arbitrary LTE frequency band for NR signal transmission and reception was partially made through 3GPP rel-15.

As an implementation form in DSS, some resources of some LTE DL subframes in LTE frequency band are used for PDCCH, PDSCH and DM RS transmission of NR, and some resources of LTE UL subframe are used for NR PUSCH, PUCCH and DM RS transmission The form and the like may be applied.

In particular, in the case of LTE frequency band, since it is often configured in a low frequency band compared to NR, one base station can support a wider cell coverage in terms of cell coverage. On the other hand, in the case of an NR cell configured in a high frequency band, small for data boosting may be suitable for the cell. In such a cell deployment scenario, for an arbitrary terminal, an NR cell configured based on DSS in an LTE band is a primary cell (PCell), and an NR cell configured in an NR frequency band is a secondary cell (SCell). ) can be composed of

As such, when an arbitrary NR cell configured based on DSS in the LTE frequency band is configured as a primary cell, and an NR cell configured in the NR frequency band is configured as a secondary cell, the PCell supporting only self-scheduling can coexist with LTE ( coexistence), the capacity of the PDCCH may be insufficient. Accordingly, it is necessary to support scheduling of the data channel of the PCell through the SCell.

As described above, in the present disclosure, when carrier aggregation (CA) is configured for an arbitrary terminal, cross-carrier scheduling for the PSCell in the case of a PCell or a secondary cell group (SCG) through the SCell. ) to support a downlink control information transmission method and an activation/deactivation method of the SCell to be proposed.

Hereinafter, a data transmission/reception method using a plurality of cells will be specifically described with reference to related drawings.

10 is a diagram illustrating a procedure in which a terminal performs data transmission/reception using a plurality of cells according to an embodiment.

Referring to FIG. 10 , the terminal may receive cross-carrier scheduling related information for at least two cells ( S1000 ).

In order to describe the embodiments according to the present disclosure, it is assumed that carrier aggregation (CA) in which two cells are aggregated for a terminal or dual connectivity (DC) for a master base station and a secondary base station is configured. . That is, the present disclosure will be described on the premise that at least two or more cells are used for the terminal to transmit and receive data with the base station.

In this case, the primary cell of the primary cell (PCell) in the carrier merging or the primary cell of the master cell group (MCG) in the double connection and the secondary cell group (Secondary Cell Group; SCG) of the primary secondary cell (PSCell) ) may be configured based on DSS in a radio access technology in which subcarrier spacing is set to a single value of 15 kHz, that is, in the frequency band of LTE. In addition, at least one of the secondary cells (SCell) may be configured in a radio access technology in which subcarrier spacing is set to one of at least two or more candidate values, that is, in a frequency band of NR.

In addition, cross-carrier scheduling in which a primary cell configured in an LTE frequency band or a primary secondary cell configured in an NR frequency band is scheduled by a secondary cell configured in an NR frequency band may be configured. In the following description, unless otherwise specified, a primary cell or a primary secondary cell is configured in an LTE frequency band, and a secondary cell is configured in an NR frequency band to schedule a primary cell or a primary secondary cell. means cell. However, this is an example, and the technical spirit of the present disclosure may be applied regardless of a frequency band in which cells are configured to the extent that they do not contradict each other.

According to an example, the cross-carrier scheduling related information for at least two or more cells may include information that the primary cell or the primary secondary cell may be scheduled by the secondary cell. That is, when a serving cell configured in the terminal is a primary cell or a primary secondary cell, the cross-carrier scheduling related information may include cross-carrier scheduling configuration information.

In this case, the scheduling cell information included in the cross-carrier scheduling configuration information may include information that can be scheduled by another cell with respect to the primary cell or the primary secondary cell. That is, the corresponding scheduling cell information may be set to an 'other' value indicating cross-carrier scheduling scheduled by the PDCCH of another cell instead of an 'own' value indicating self-scheduling. Accordingly, a scheduling cell ID and a carrier indicator field (CIF) value indicating a primary cell or a secondary cell scheduled for the primary secondary cell may be included in the cross-carrier scheduling configuration information.

According to another example, the cross-carrier scheduling related information may include information that scheduling can be performed on a primary cell or a primary secondary cell with respect to the secondary cell. That is, for the primary cell or the secondary cell scheduling the primary secondary cell, separate cross-carrier scheduling configuration information is set for the cross-carrier scheduling related information, or a separate information area can be added to the cross-carrier scheduling configuration information. there is.

In this case, when the scheduling cell information is set to 'own' in the cross-carrier scheduling configuration information for the secondary cell, in addition to the 'CIF-presence' information area indicating whether CIF is included in the DCI format of the cell, in addition to the DCI format A 'pif-presence-r17' information region indicating whether a PCell/PSCell Indicator Field (PIF) for indicating a primary cell or a primary secondary cell is included may be further included.

According to another example, the cross-carrier scheduling related information may include information indicating a primary cell or a secondary cell performing scheduling on the primary secondary cell among at least two or more cells. In this case, the cross-carrier scheduling related information may include a separate RRC message for configuring the primary cell or the secondary cell scheduling the primary secondary cell.

That is, when a primary cell or a secondary cell scheduling a primary secondary cell is defined as a PS-SCell, any secondary cell may be configured as a PS-SCell through UE-specific RRC signaling.

With respect to the cross-carrier scheduling described above, whether it is possible to configure cross-carrier scheduling for the primary cell or the primary secondary cell from the secondary cell is explicitly indicated through cell-specific or UE-specific RRC signaling, or the configuration of the PBCH etc. may be implicitly indicated.

As an example, whether cross-carrier scheduling for the primary cell or the primary secondary cell is configured may be explicitly transmitted to the UE through cell-specific or UE-specific RRC signaling in the corresponding cell. For example, information indicating that cross-carrier scheduling is possible even when the corresponding cell is a primary cell or a primary secondary cell may be transmitted through a Master Information Block (MIB) or a System Information Block (SIB).

As another example, whether to configure cross-carrier scheduling for the primary cell or the primary secondary cell may be implicitly indicated to the UE in the corresponding cell. For example, based on the location or sequence of the DMRS of the PBCH, it may be possible to inform whether the corresponding cross-carrier scheduling can be set. Alternatively, based on the release information of the base station, for example, for an NR serving cell configured through a rel-17 or higher base station, it may be implicitly indicated that cross-carrier scheduling for a primary cell or a primary secondary cell is supported. .

As another example, according to the frequency band in which the corresponding NR serving cell is configured, for example, depending on whether the LTE frequency band or the NR frequency band, cross-carrier scheduling for the primary cell or the primary secondary cell can be determined. there is.

Again, referring to FIG. 10, the UE receives scheduling information for a primary cell (PCell) or a primary secondary cell (PSCell) from a secondary cell (SCell) among at least two or more cells (S1010), and the received scheduling information Data may be transmitted/received based on (S1020).

As described above, when an arbitrary secondary cell is configured as a scheduling cell for a primary cell or a primary secondary cell, data transmission/reception through the primary cell or the primary secondary cell through DCI transmitted through the PDCCH in the secondary cell This can be scheduled.

According to an example, when the cross-carrier scheduling related information includes information that can be scheduled by the secondary cell with respect to the primary cell or the primary secondary cell, the CIF information area included in the DCI format transmitted from the secondary cell Through , scheduling control information for a primary cell or a primary secondary cell may be transmitted.

According to another example, when the cross-carrier scheduling related information includes information that scheduling can be performed on a primary cell or a primary secondary cell with respect to a secondary cell, the DCI format transmitted from the secondary cell includes PIF information It may further include a region. That is, when the DCI format transmitted from the secondary cell includes the PIF information region indicating the primary cell or the primary secondary cell, the DCI format may be scheduling control information for the primary cell or the primary secondary cell.

As such, when the PIF information region is additionally included, a search space set consisting of PDCCH candidates for transmitting the corresponding DCI format is composed of PDCCH candidates for transmitting the scheduling DCI format for the corresponding secondary cell. It can be set the same as the search space set.

According to another example, when the cross-carrier scheduling-related information includes information indicating a primary cell or a secondary cell performing scheduling for a primary secondary cell, the DCI format transmitted from the secondary cell includes a primary cell or A CIF or PIF information region indicating a primary secondary cell may be included.

That is, the corresponding DCI format may indicate the primary cell or the primary secondary cell based on the existing CIF or based on a separate PIF. When a separate PIF is included in the corresponding DCI format, a separate CIF information area may not be included. In addition, when a separate PIF is included, a separate search space for transmitting the DCI format for the primary cell or the primary secondary cell may be set.

The UE may transmit/receive data through the primary cell or the primary secondary cell based on the scheduling information received from the secondary cell.

According to this, in the case of using a plurality of cells, scheduling of the primary cell or the primary secondary cell is configured to be performed through the secondary cell, thereby enabling more efficient data transmission and reception. A data transmission/reception method using a plurality of cells and devices may be provided.

Hereinafter, the operation of the base station related to the operation of the above-described terminal will be described with reference to the drawings.

11 is a diagram illustrating a procedure in which a base station controls data transmission/reception using a plurality of cells according to an embodiment.

Referring to FIG. 11 , the base station may transmit cross-carrier scheduling related information for at least two or more cells ( S1100 ).

A primary cell (PCell) in carrier merging or a primary cell and a secondary cell group of a master cell group (MCG) in a double linkage (Secondary Cell Group; SCG) of a primary secondary cell (PSCell), A radio access technology in which subcarrier spacing is set to a single value of 15 kHz, that is, it may be configured based on DSS in the frequency band of LTE. In addition, at least one of the secondary cells (SCell) may be configured in a radio access technology in which subcarrier spacing is set to one of at least two or more candidate values, that is, in a frequency band of NR.

In addition, cross-carrier scheduling in which a primary cell configured in an LTE frequency band or a primary secondary cell configured in an NR frequency band is scheduled by a secondary cell configured in an NR frequency band may be configured.

According to an example, the cross-carrier scheduling related information for at least two or more cells may include information that the primary cell or the primary secondary cell may be scheduled by the secondary cell. That is, when a serving cell configured in the terminal is a primary cell or a primary secondary cell, the cross-carrier scheduling related information may include cross-carrier scheduling configuration information.

In this case, the scheduling cell information included in the cross-carrier scheduling configuration information may include information that can be scheduled by another cell with respect to the primary cell or the primary secondary cell. That is, the corresponding scheduling cell information may be set to an 'other' value indicating cross-carrier scheduling scheduled by the PDCCH of another cell instead of an 'own' value indicating self-scheduling. Accordingly, a scheduling cell ID and a carrier indicator field (CIF) value indicating a primary cell or a secondary cell scheduled for the primary secondary cell may be included in the cross-carrier scheduling configuration information.

According to another example, the cross-carrier scheduling related information may include information that scheduling can be performed on a primary cell or a primary secondary cell with respect to the secondary cell. That is, for the primary cell or the secondary cell scheduling the primary secondary cell, separate cross-carrier scheduling configuration information is set for the cross-carrier scheduling related information, or a separate information area can be added to the cross-carrier scheduling configuration information. there is.

In this case, when the scheduling cell information is set to 'own' in the cross-carrier scheduling configuration information for the secondary cell, in addition to the 'CIF-presence' information area indicating whether CIF is included in the DCI format of the cell, in addition to the DCI format A 'pif-presence-r17' information region indicating whether a PCell/PSCell Indicator Field (PIF) for indicating a primary cell or a primary secondary cell is included may be further included.

According to another example, the cross-carrier scheduling related information may include information indicating a primary cell or a secondary cell performing scheduling on the primary secondary cell among at least two or more cells. In this case, the cross-carrier scheduling related information may include a separate RRC message for configuring the primary cell or the secondary cell scheduling the primary secondary cell.

That is, when a primary cell or a secondary cell scheduling a primary secondary cell is defined as a PS-SCell, any secondary cell may be configured as a PS-SCell through UE-specific RRC signaling.

With respect to the cross-carrier scheduling described above, whether it is possible to configure cross-carrier scheduling for the primary cell or the primary secondary cell from the secondary cell is explicitly indicated through cell-specific or UE-specific RRC signaling, or the configuration of the PBCH etc. may be implicitly indicated.

As an example, whether cross-carrier scheduling for the primary cell or the primary secondary cell is configured may be explicitly transmitted to the UE through cell-specific or UE-specific RRC signaling in the corresponding cell. For example, information indicating that cross-carrier scheduling is possible even when the corresponding cell is a primary cell or a primary secondary cell may be transmitted through a Master Information Block (MIB) or a System Information Block (SIB).

As another example, whether to configure cross-carrier scheduling for the primary cell or the primary secondary cell may be implicitly indicated to the UE in the corresponding cell. For example, based on the location or sequence of the DMRS of the PBCH, it may be possible to inform whether the corresponding cross-carrier scheduling can be set. Alternatively, based on the release information of the base station, for example, for an NR serving cell configured through a rel-17 or higher base station, it may be implicitly indicated that cross-carrier scheduling for a primary cell or a primary secondary cell is supported. .

As another example, according to the frequency band in which the corresponding NR serving cell is configured, for example, depending on whether the LTE frequency band or the NR frequency band, cross-carrier scheduling for the primary cell or the primary secondary cell can be determined. there is.

Again, referring to FIG. 11, the base station transmits scheduling information for a primary cell (PCell) or a primary secondary cell (PSCell) among at least two or more cells through a secondary cell (SCell), and based on the transmitted scheduling information to transmit/receive data (S1120).

As described above, when an arbitrary secondary cell is configured as a scheduling cell for a primary cell or a primary secondary cell, data transmission/reception through the primary cell or the primary secondary cell through DCI transmitted through the PDCCH in the secondary cell This can be scheduled.

According to an example, when the cross-carrier scheduling related information includes information that can be scheduled by the secondary cell with respect to the primary cell or the primary secondary cell, the CIF information area included in the DCI format transmitted from the secondary cell Through , scheduling control information for a primary cell or a primary secondary cell may be transmitted.

According to another example, when the cross-carrier scheduling related information includes information that scheduling can be performed on a primary cell or a primary secondary cell with respect to a secondary cell, the DCI format transmitted from the secondary cell includes PIF information It may further include a region. That is, when the DCI format transmitted from the secondary cell includes the PIF information region indicating the primary cell or the primary secondary cell, the DCI format may be scheduling control information for the primary cell or the primary secondary cell.

As such, when the PIF information region is additionally included, a search space set consisting of PDCCH candidates for transmitting the corresponding DCI format is composed of PDCCH candidates for transmitting the scheduling DCI format for the corresponding secondary cell. It can be set the same as the search space set.

According to another example, when the cross-carrier scheduling-related information includes information indicating a primary cell or a secondary cell performing scheduling for a primary secondary cell, the DCI format transmitted from the secondary cell includes a primary cell or A CIF or PIF information region indicating a primary secondary cell may be included.

That is, the corresponding DCI format may indicate the primary cell or the primary secondary cell based on the existing CIF or based on a separate PIF. When a separate PIF is included in the corresponding DCI format, a separate CIF information area may not be included. In addition, when a separate PIF is included, a separate search space for transmitting the DCI format for the primary cell or the primary secondary cell may be set.

The base station may transmit/receive data through the primary cell or the primary secondary cell based on the scheduling information transmitted through the secondary cell.

According to this, in the case of using a plurality of cells, scheduling of the primary cell or the primary secondary cell is configured to be performed through the secondary cell, thereby enabling more efficient data transmission and reception. A data transmission/reception method using a plurality of cells and devices may be provided.

Hereinafter, each embodiment related to a data transmission/reception method using a plurality of cells will be described in detail with reference to the related drawings. The embodiments described below may be applied individually or in any combination.

According to cross-carrier scheduling in the existing CA situation, cross-carrier scheduling in which scheduling is performed through a PCell or another scheduling SCell may be applied to any SCell, but only self-scheduling is applicable to PCell. Similarly, when dual connectivity (DC) is configured for an arbitrary terminal, only self-scheduling is applied to the PCell of the Master Cell Group (MCG) and the PSCell of the Secondary Cell Group (SCG). do. That is, according to the existing cross-carrier scheduling setting method, any SCell becomes a scheduling cell that transmits a PDCCH including scheduling control information for PDSCH/PUSCH transmitted through another SCell, or is transmitted through the corresponding SCell. The PDCCH including the scheduling control information for the PDSCH/PUSCH may operate as a scheduled cell in which the PDCCH is transmitted through another SCell or PCell or PSCell. On the other hand, in the case of a PCell or a PSCell, only self-scheduling of the PDCCH including scheduling control information for a PDSCH/PUSCH transmitted through a corresponding cell is supported only through its own cell.

In this case, cross-carrier scheduling for an arbitrary SCell is set through an RRC message. An RRC message format for setting the corresponding cross-carrier scheduling is shown in FIG. 12 . Accordingly, according to the existing cross-carrier scheduling setting method, in the case of PCell and PSCell, the setting value through schedulingCellInfo is limited to 'own'. Operation as a scheduled cell in which cross-carrier scheduling of is limited is limited.

In the present disclosure, as a method for scheduling a PCell or a PSCell through the SCell, a specific method for recycling the existing cross-carrier scheduling configuration RRC message format and framework is proposed.

Example 1. Cross-carrier scheduling setting for PCell/PSCell

When any serving cell configured in any UE is a PCell or PSCell, the network is defined not to set the corresponding PCell or PSCell as a scheduled cell through a cross-carrier scheduling RRC message. That is, schedulingCellInfo for PCell or PSCell is always set to 'own', and 'other' is defined to be set only for SCell. Accordingly, it is not expected that cross-carrier scheduling is set for PCell or PSCell in any terminal.

However, as described above, an arbitrary NR serving cell is configured based on DSS in the LTE frequency band, and the corresponding serving cell may be configured as a PCell or a PSCell in any UE. In this case, another NR serving cell configured in the NR frequency band may be configured as the SCell in the corresponding UE. In this case, scheduling the PCell or the PSCell through the corresponding SCell may be beneficial in terms of PDCCH capacity.

Accordingly, as an example of cross-carrier scheduling setting for scheduling a PCell or a PSCell through the SCell, as indicated by an underline in FIG. 13 , schedulingCellInfo may be defined to be settable to 'other' for the PCell or PSCell. In this case, the schedulingCellID and carrier indicator field (CIF) values for scheduling for the PCell or PSCell may be set also for the PCell or PSCell, in the same way as when cross-carrier scheduling is configured for the existing SCell. Accordingly, scheduling control information for the corresponding PCell or PSCell may be transmitted through the CIF information area of the DCI format transmitted through the PDCCH in the corresponding scheduling serving cell.

As another example of setting cross-carrier scheduling for PCell or PSCell, a separate RRC message is defined or a separate rel-17 information area (IE, Information Element) is defined to be included in the 'CrossCarrierSchedulingConfig' message. can do. For example, a new information area 'pif (PCell/PSCell Indicator Field)-presence' information area may be defined in the 'CrossCarrierSchedulingConfig' message. That is, as indicated by the underline in FIG. 14 , when the schedulingCellInfo of an arbitrary SCell is set to own, a 'pif-presence-r17' information area may be additionally configured in addition to the 'CIF-presence'. Alternatively, it can be set as a scheduling cell for the PSCell.

Accordingly, when any SCell is set to own and pif-presence is set to true, the DCI format transmitted through the PDCCH in the corresponding SCell may include pif. The corresponding pif is an information area separate from cif, and is information indicating only the PCell or the PSCell. That is, when an arbitrary DCI format includes a pif and the corresponding pif indicates a PCell or a PSCell, the corresponding DCI format may be scheduling control information for the PCell or PSCell. Specifically, if the corresponding Scell belongs to the MCG, pif may be indication information for the PCell, and if the SCell belongs to the SCG, pif may be indication information for the PSCell. In addition, when pif is additionally defined as described above, a search space set consisting of PDCCH candidates for transmitting the DCI format for the corresponding PCell/PSCell scheduling is used for transmitting the scheduling DCI format for the corresponding SCell. It may be the same as the search space set composed of PDCCH candidates.

In addition, when the DCI format transmitted from the corresponding SCell additionally includes cif, when the DCI format transmitted from the corresponding SCell is the scheduling DCI format for the PCell or PSCell, that is, the pif included in the DCI format indicates the PCell or the PSCell. In this case, the cif may be defined to be set to a '0' value, that is, a value indicating the corresponding SCell itself, or to ignore the cif setting value in the terminal.

Alternatively, as another example, a separate RRC message for configuring an SCell scheduling a PCell or a PSCell may be defined. That is, a PS-SCell for scheduling a PCell or a PSCell may be defined, and the PS-SCell may be configured for an arbitrary SCell through UE-specific RRC signaling. If an arbitrary SCell is configured as a PS-SCell through UE-specific RRC signaling, and the SCell belongs to the MCG, it means that the SCell is configured as a scheduling cell for the PCell. do. The PS-SCell configuration RRC message includes a CIF value for indicating the PCell or PSCell through the scheduling DCI format when indicating the PCell/PSCell based on the existing cif, or a separate cif value when the pif is defined may not be included. In addition, the PS-SCell configuration RRC message may include separate search space configuration information for transmitting the DCI format for the PCell or the PSCell.

Example 2. Indicating whether cross-carrier scheduling is supported for PCell or PSCell

Any NR serving cell may inform the UE of whether cross-carrier scheduling can be configured through the SCell even when the corresponding cell is configured as PCell or PSCell in any UE. That is, even when the corresponding NR serving cell is set to PCell or PSCell in any UE, the schedulingCellInfor of the 'crosscarrierschedulingconfig' RRC message can be set to 'other'. You can inform the UEs in the cell.

As an example for this, whether cross-carrier scheduling for the PCell or the PSCell is configured may be explicitly transmitted to the UE through cell-specific or UE-specific RRC signaling in the corresponding cell. For example, through MIB (Master Information Block) or SIB (System Information Block), an information area for informing the UE of whether cross-carrier scheduling can be set can be defined even when the corresponding cell is a PCell or PSCell. there is.

As another example, the cell may implicitly inform the UE of whether cross-carrier scheduling is set for the PCell or the PSCell. For example, based on the location, sequence, etc. of the DM RS of the PBCH, it is possible to inform whether the corresponding cross-carrier scheduling can be set. Or, based on the release information of the base station, for example, for an NR serving cell configured through a rel-17 or higher base station, to implicitly indicate that cross-carrier scheduling for a primary cell or a primary secondary cell is supported. can be defined

Or, as another example, whether cross-carrier scheduling for the corresponding PCell or PSCell can be set is determined according to the frequency band in which the corresponding NR serving cell is configured, for example, whether it is an LTE frequency band or an NR frequency band. can do.

Similarly, the terminal may notify the base station of whether the terminal supports cross-carrier scheduling configuration for the PCell through capability signaling. For example, the terminal may explicitly or implicitly inform the base station of this through capability signaling.

Additionally, for example, embodiments according to the present disclosure are not limited by the terms used in the present disclosure, such as pif, PS-SCell, etc., and other terms or names indicating the same concept and operation are also within the scope of the present disclosure. It is obvious that it can be included. In addition, in the above description, it is assumed that the PCell/PSCell is a DSS-based NR serving cell configured in the LTE frequency band, but the present disclosure is not limited thereto, regardless of the frequency band in which any PCell/PSCell is configured. can be applied.

Hereinafter, configurations of a terminal and a base station capable of performing some or all of the embodiments described with reference to FIGS. 1 to 14 will be described with reference to the drawings. However, in order to avoid overlapping descriptions, some of the above descriptions will be omitted.

15 is a diagram showing the configuration of a user terminal 1500 according to another embodiment.

Referring to FIG. 15 , a user terminal 1500 according to another embodiment includes a controller 1510 , a transmitter 1520 , and a receiver 1530 .

The controller 1510 controls the overall operation of the user terminal 1500 according to the data transmission/reception method using a plurality of cells necessary for carrying out the above-described present disclosure. The transmitter 1520 transmits uplink control information, data, and messages to the base station through a corresponding channel. The receiver 1530 receives downlink control information, data, and messages from the base station through a corresponding channel.

The receiver 1530 may receive cross-carrier scheduling related information for at least two or more cells.

In this case, the primary cell of the primary cell (PCell) in the carrier merging or the primary cell of the master cell group (MCG) in the double connection and the secondary cell group (Secondary Cell Group; SCG) of the primary secondary cell (PSCell) ) may be configured based on DSS in a radio access technology in which subcarrier spacing is set to a single value of 15 kHz, that is, in the frequency band of LTE. In addition, at least one of the secondary cells (SCell) may be configured in a radio access technology in which subcarrier spacing is set to one of at least two or more candidate values, that is, in a frequency band of NR.

In addition, cross-carrier scheduling in which a primary cell configured in an LTE frequency band or a primary secondary cell configured in an NR frequency band is scheduled by a secondary cell configured in an NR frequency band may be configured.

According to an example, the receiving unit 1530 may receive cross-carrier scheduling related information including information that the primary cell or the primary secondary cell can be scheduled by the secondary cell. That is, when a serving cell configured in the terminal is a primary cell or a primary secondary cell, the cross-carrier scheduling related information may include cross-carrier scheduling configuration information.

In this case, the scheduling cell information included in the cross-carrier scheduling configuration information may include information that can be scheduled by another cell with respect to the primary cell or the primary secondary cell. That is, the corresponding scheduling cell information may be set to an 'other' value indicating cross-carrier scheduling scheduled by the PDCCH of another cell instead of an 'own' value indicating self-scheduling. Accordingly, a scheduling cell ID and a carrier indicator field (CIF) value indicating a primary cell or a secondary cell scheduled for the primary secondary cell may be included in the cross-carrier scheduling configuration information.

According to another example, the receiver 1530 may receive cross-carrier scheduling related information including information indicating that scheduling can be performed on a primary cell or a primary secondary cell with respect to the secondary cell. That is, for the primary cell or the secondary cell scheduling the primary secondary cell, separate cross-carrier scheduling configuration information is set for the cross-carrier scheduling related information, or a separate information area can be added to the cross-carrier scheduling configuration information. there is.

In this case, when the scheduling cell information is set to 'own' in the cross-carrier scheduling configuration information for the secondary cell, in addition to the 'CIF-presence' information area indicating whether CIF is included in the DCI format of the cell, in addition to the DCI format A 'pif-presence-r17' information region indicating whether a PCell/PSCell Indicator Field (PIF) for indicating a primary cell or a primary secondary cell is included may be further included.

According to another example, the receiving unit 1530 may receive cross-carrier scheduling related information including information indicating a primary cell or a secondary cell performing scheduling on a primary secondary cell among at least two or more cells. there is. In this case, the cross-carrier scheduling related information may include a separate RRC message for configuring the primary cell or the secondary cell scheduling the primary secondary cell.

That is, when a primary cell or a secondary cell scheduling a primary secondary cell is defined as a PS-SCell, any secondary cell may be configured as a PS-SCell through UE-specific RRC signaling.

With respect to the cross-carrier scheduling described above, whether it is possible to set the cross-carrier scheduling for the primary cell or the primary secondary cell from the secondary cell is explicitly indicated through cell-specific or UE-specific RRC signaling, or the configuration of the PBCH etc. may be implicitly indicated.

As an example, the receiver 1530 may explicitly receive whether to set cross-carrier scheduling for the primary cell or the primary secondary cell through cell-specific or UE-specific RRC signaling in the corresponding cell. For example, information indicating that cross-carrier scheduling is possible even when the corresponding cell is a primary cell or a primary secondary cell may be received through a Master Information Block (MIB) or a System Information Block (SIB).

As another example, whether to configure cross-carrier scheduling for the primary cell or the primary secondary cell may be implicitly indicated to the UE in the corresponding cell. For example, based on the location or sequence of the DMRS of the PBCH, it may be possible to inform whether the corresponding cross-carrier scheduling can be set. Alternatively, based on the release information of the base station, for example, for an NR serving cell configured through a rel-17 or higher base station, it may be implicitly indicated that cross-carrier scheduling for a primary cell or a primary secondary cell is supported. .

As another example, according to the frequency band in which the corresponding NR serving cell is configured, for example, depending on whether the LTE frequency band or the NR frequency band, cross-carrier scheduling for the primary cell or the primary secondary cell can be determined. there is.

The receiver 1530 may receive scheduling information for a primary cell (PCell) or a primary secondary cell (PSCell) from among at least two or more cells from a secondary cell (SCell). The controller 1510 may control the transmitter 1520 and the receiver 1530 to transmit and receive data based on the received scheduling information.

As described above, when an arbitrary secondary cell is set as a scheduling cell for a primary cell or a primary secondary cell, the receiving unit 1530 transmits scheduling information for data transmission/reception through the primary cell or the primary secondary cell to the corresponding secondary It can be received through DCI transmitted through the PDCCH in the cell.

According to an example, when the cross-carrier scheduling related information includes information that can be scheduled by the secondary cell with respect to the primary cell or the primary secondary cell, the CIF information area included in the DCI format transmitted from the secondary cell Through , scheduling control information for a primary cell or a primary secondary cell may be transmitted.

According to another example, when the cross-carrier scheduling related information includes information that scheduling can be performed on a primary cell or a primary secondary cell with respect to a secondary cell, the DCI format transmitted from the secondary cell includes PIF information It may further include a region. That is, when the DCI format transmitted from the secondary cell includes the PIF information region indicating the primary cell or the primary secondary cell, the DCI format may be scheduling control information for the primary cell or the primary secondary cell.

According to another example, when the cross-carrier scheduling-related information includes information indicating a primary cell or a secondary cell performing scheduling for a primary secondary cell, the DCI format transmitted from the secondary cell includes a primary cell or A CIF or PIF information region indicating a primary secondary cell may be included.

The controller 1510 may control data transmission/reception through the primary cell or the primary secondary cell based on the scheduling information received from the secondary cell.

According to this, in the case of using a plurality of cells, scheduling of the primary cell or the primary secondary cell is configured to be performed through the secondary cell, thereby enabling more efficient data transmission and reception. A data transmission/reception method using a plurality of cells and devices may be provided.

16 is a diagram showing the configuration of a base station 1600 according to another embodiment.

Referring to FIG. 16 , a base station 1600 according to another embodiment includes a controller 1610 , a transmitter 1620 , and a receiver 1630 .

The controller 1610 controls the overall operation of the base station 1600 according to the data transmission/reception method using a plurality of cells necessary for carrying out the above-described present disclosure. The transmitter 1620 and the receiver 1630 are used to transmit/receive signals, messages, and data necessary for carrying out the above-described present disclosure with the terminal.

The transmitter 1620 may transmit cross-carrier scheduling related information for at least two or more cells to the terminal.

In this case, the primary cell of the primary cell (PCell) in the carrier merging or the primary cell of the master cell group (MCG) in the double connection and the secondary cell group (Secondary Cell Group; SCG) of the primary secondary cell (PSCell) ) may be configured based on DSS in a radio access technology in which subcarrier spacing is set to a single value of 15 kHz, that is, a frequency band of LTE. In addition, at least one of the secondary cells (SCell) may be configured in a radio access technology in which subcarrier spacing is set to one of at least two or more candidate values, that is, in a frequency band of NR.

In addition, cross-carrier scheduling in which a primary cell configured in an LTE frequency band or a primary secondary cell configured in an NR frequency band is scheduled by a secondary cell configured in an NR frequency band may be configured.

According to an example, the transmitter 1620 may transmit, to the primary cell or the primary secondary cell, cross-carrier scheduling related information including information indicating that schedule can be performed by the secondary cell. That is, when a serving cell configured in the terminal is a primary cell or a primary secondary cell, the cross-carrier scheduling related information may include cross-carrier scheduling configuration information.

In this case, the scheduling cell information included in the cross-carrier scheduling configuration information may include information that can be scheduled by another cell with respect to the primary cell or the primary secondary cell. That is, the corresponding scheduling cell information may be set to a 'other' value indicating cross-carrier scheduling scheduled by the PDCCH of another cell instead of an 'own' value indicating self-scheduling. Accordingly, a scheduling cell ID and a carrier indicator field (CIF) value indicating a primary cell or a secondary cell scheduled for the primary secondary cell may be included in the cross-carrier scheduling configuration information.

According to another example, the transmitter 1620 may transmit, with respect to the secondary cell, cross-carrier scheduling related information including information indicating that scheduling for the primary cell or the primary secondary cell can be performed. That is, for the primary cell or the secondary cell scheduling the primary secondary cell, separate cross-carrier scheduling configuration information is set for the cross-carrier scheduling related information, or a separate information area can be added to the cross-carrier scheduling configuration information. there is.

In this case, when the scheduling cell information is set to 'own' in the cross-carrier scheduling configuration information for the secondary cell, in addition to the 'CIF-presence' information area indicating whether CIF is included in the DCI format of the cell, in addition to the DCI format A 'pif-presence-r17' information region indicating whether a PCell/PSCell Indicator Field (PIF) for indicating a primary cell or a primary secondary cell is included may be further included.

According to another example, the transmitter 1620 may transmit cross-carrier scheduling related information including information indicating a primary cell or a secondary cell performing scheduling on a primary secondary cell among at least two or more cells. . In this case, the cross-carrier scheduling related information may include a separate RRC message for configuring the primary cell or the secondary cell scheduling the primary secondary cell.

That is, when a primary cell or a secondary cell scheduling a primary secondary cell is defined as a PS-SCell, any secondary cell may be configured as a PS-SCell through UE-specific RRC signaling.

With respect to the cross-carrier scheduling described above, whether it is possible to configure cross-carrier scheduling for the primary cell or the primary secondary cell from the secondary cell is explicitly indicated through cell-specific or UE-specific RRC signaling, or the configuration of the PBCH etc. may be implicitly indicated.

As an example, the transmitter 1620 may explicitly transmit whether to set cross-carrier scheduling for the primary cell or the primary secondary cell through cell-specific or UE-specific RRC signaling in the corresponding cell. For example, information indicating that cross-carrier scheduling is possible even when the corresponding cell is a primary cell or a primary secondary cell may be transmitted through a Master Information Block (MIB) or a System Information Block (SIB).

As another example, whether to configure cross-carrier scheduling for the primary cell or the primary secondary cell may be implicitly indicated to the UE in the corresponding cell. For example, based on the location or sequence of the DMRS of the PBCH, it may be possible to inform whether the corresponding cross-carrier scheduling can be set. Alternatively, based on the release information of the base station, for example, for an NR serving cell configured through a rel-17 or higher base station, it may be implicitly indicated that cross-carrier scheduling for a primary cell or a primary secondary cell is supported. .

As another example, according to the frequency band in which the corresponding NR serving cell is configured, for example, depending on whether the LTE frequency band or the NR frequency band, cross-carrier scheduling for the primary cell or the primary secondary cell can be determined. there is.

The transmitter 1620 may transmit scheduling information for a primary cell (PCell) or a primary secondary cell (PSCell) among at least two or more cells through a secondary cell (SCell). The controller 1610 may control the transmitter 1620 and the receiver 1630 to transmit and receive data based on the transmitted scheduling information.

As described above, when an arbitrary secondary cell is set as a scheduling cell for a primary cell or a primary secondary cell, the transmitter 1620 transmits scheduling information for data transmission/reception through the primary cell or the primary secondary cell to the corresponding secondary It can be transmitted through DCI transmitted through the PDCCH in the cell.

According to an example, when the cross-carrier scheduling related information includes information that can be scheduled by the secondary cell with respect to the primary cell or the primary secondary cell, the CIF information area included in the DCI format transmitted from the secondary cell Through , scheduling control information for a primary cell or a primary secondary cell may be transmitted.

According to another example, when the cross-carrier scheduling related information includes information that scheduling can be performed on a primary cell or a primary secondary cell with respect to a secondary cell, the DCI format transmitted from the secondary cell includes PIF information It may further include a region. That is, when the DCI format transmitted from the secondary cell includes the PIF information region indicating the primary cell or the primary secondary cell, the DCI format may be scheduling control information for the primary cell or the primary secondary cell.

According to another example, when the cross-carrier scheduling-related information includes information indicating a primary cell or a secondary cell performing scheduling for a primary secondary cell, the DCI format transmitted from the secondary cell includes a primary cell or A CIF or PIF information region indicating a primary secondary cell may be included.

The controller 1610 may control to transmit/receive data through the primary cell or the primary secondary cell based on the scheduling information transmitted through the secondary cell.

According to this, in the case of using a plurality of cells, scheduling of the primary cell or the primary secondary cell is configured to be performed through the secondary cell, thereby enabling more efficient data transmission and reception. A data transmission/reception method using a plurality of cells and devices may be provided.

The above-described embodiments may be supported by standard documents disclosed in at least one of IEEE 802, 3GPP and 3GPP2, which are wireless access systems. That is, steps, configurations, and parts not described in order to clearly reveal the present technical idea among the present embodiments may be supported by the above-described standard documents. In addition, all terms disclosed in this specification can be described by the standard documents disclosed above.

The above-described embodiments may be implemented through various means. For example, the present embodiments may be implemented by hardware, firmware, software, or a combination thereof.

In the case of implementation by hardware, the method according to the present embodiments may include one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), FPGAs (Field Programmable Gate Arrays), may be implemented by a processor, a controller, a microcontroller or a microprocessor.

In the case of implementation by firmware or software, the method according to the present embodiments may be implemented in the form of an apparatus, procedure, or function that performs the functions or operations described above. The software code may be stored in the memory unit and driven by the processor. The memory unit may be located inside or outside the processor, and may transmit/receive data to and from the processor by various well-known means.

Also, as described above, terms such as "system", "processor", "controller", "component", "module", "interface", "model", or "unit" generally refer to computer-related entities hardware, hardware and software. may mean a combination of, software, or running software. For example, the aforementioned component may be, but is not limited to, a process run by a processor, a processor, a controller, a controlling processor, an object, a thread of execution, a program, and/or a computer. For example, both an application running on a controller or processor and a controller or processor can be a component. One or more components may reside within a process and/or thread of execution, and the components may be located on one device (eg, a system, computing device, etc.) or distributed across two or more devices.

The above description is merely illustrative of the technical spirit of the present disclosure, and various modifications and variations will be possible without departing from the essential characteristics of the present disclosure by those skilled in the art to which the present disclosure pertains. In addition, the present embodiments are not intended to limit the technical spirit of the present disclosure, but to explain, and thus the scope of the present technical spirit is not limited by these embodiments. The protection scope of the present disclosure should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present disclosure.

Claims (20)

In a method for a terminal to transmit and receive data using a plurality of cells,
Receiving cross-carrier scheduling related information for at least two or more cells;
receiving scheduling information for a primary cell (PCell) or a primary secondary cell (PSCell) from among the at least two or more cells from a secondary cell (SCell); and
and transmitting and receiving data based on the scheduling information. The method of claim 1,
The primary cell or primary secondary cell,
is configured in the frequency band of radio access technology in which subcarrier spacing is set to a single value of 15 kHz,
The secondary cell is
A method in which subcarrier spacing is configured in a frequency band of a radio access technology in which one of at least two or more candidate values is set. The method of claim 1,
The cross-carrier scheduling related information,
With respect to the primary cell or the primary secondary cell, the method comprising information that can be scheduled by the secondary cell. The method of claim 1,
The cross-carrier scheduling related information,
With respect to the secondary cell, a method comprising information indicating that scheduling can be performed on the primary cell or the primary secondary cell. The method of claim 1,
The cross-carrier scheduling related information,
Among the at least two or more cells, the method comprising information indicating the primary cell or the secondary cell performing scheduling for the primary secondary cell. The method of claim 1,
Whether cross-carrier scheduling for the primary cell or the primary secondary cell can be set from the secondary cell,
A method indicated through cell-specific or terminal-specific RRC signaling, or according to the configuration of a PBCH. In a method for a base station to control data transmission and reception using a plurality of cells,
transmitting cross-carrier scheduling related information for at least two or more cells;
transmitting scheduling information for a primary cell (PCell) or a primary secondary cell (PSCell) among the at least two or more cells through a secondary cell (SCell); and
and transmitting and receiving data based on the scheduling information. 8. The method of claim 7,
The primary cell or primary secondary cell,
is configured in the frequency band of radio access technology in which subcarrier spacing is set to a single value of 15 kHz,
The secondary cell is
A method in which subcarrier spacing is configured in a frequency band of a radio access technology in which one of at least two or more candidate values is set. 8. The method of claim 7,
The cross-carrier scheduling related information,
With respect to the primary cell or the primary secondary cell, the method comprising information that can be scheduled by the secondary cell. 8. The method of claim 7,
The cross-carrier scheduling related information,
With respect to the secondary cell, a method comprising information indicating that scheduling can be performed on the primary cell or the primary secondary cell. 8. The method of claim 7,
The cross-carrier scheduling related information,
Among the at least two or more cells, the method comprising information indicating the primary cell or the secondary cell performing scheduling for the primary secondary cell. 8. The method of claim 7,
Whether cross-carrier scheduling for the primary cell or the primary secondary cell can be set from the secondary cell,
A method indicated through cell-specific or terminal-specific RRC signaling, or according to the configuration of a PBCH. In the terminal performing data transmission and reception using a plurality of cells,
transmitter;
Receives cross-carrier scheduling related information for at least two or more cells, and transmits scheduling information for a primary cell (PCell) or a primary secondary cell (PSCell) among the at least two or more cells to a secondary cell (SCell) ) receiving unit to receive from; and
and a controller controlling the transmitter and the receiver to transmit and receive data based on the scheduling information. 14. The method of claim 13,
The primary cell or primary secondary cell,
is configured in the frequency band of radio access technology in which subcarrier spacing is set to a single value of 15 kHz,
The secondary cell is
A terminal configured in a frequency band of a radio access technology in which subcarrier spacing is set to one of at least two or more candidate values. 14. The method of claim 13,
The cross-carrier scheduling related information,
With respect to the primary cell or the primary secondary cell, the terminal including information that can be scheduled by the secondary cell. 14. The method of claim 13,
The cross-carrier scheduling related information,
With respect to the secondary cell, a terminal comprising information indicating that scheduling can be performed on the primary cell or the primary secondary cell. 14. The method of claim 13,
The cross-carrier scheduling related information,
A terminal comprising information indicating the primary cell or the secondary cell performing scheduling for the primary secondary cell among the at least two or more cells. 14. The method of claim 13,
Whether cross-carrier scheduling for the primary cell or the primary secondary cell can be set from the secondary cell,
A UE indicated through cell-specific or UE-specific RRC signaling, or indicated according to the configuration of a PBCH. In the base station for controlling data transmission and reception using a plurality of cells,
receiver;
Transmits cross-carrier scheduling related information for at least two or more cells, and transmits scheduling information for a primary cell (PCell) or a primary secondary cell (PSCell) among the at least two or more cells to a secondary cell (SCell) ) through the transmitter; and
and a controller controlling the transmitter and the receiver to transmit and receive data based on the scheduling information. 20. The method of claim 19,
The primary cell or primary secondary cell,
is configured in the frequency band of radio access technology in which subcarrier spacing is set to a single value of 15 kHz,
The secondary cell is
A base station configured in a frequency band of a radio access technology in which subcarrier spacing is set to one of at least two or more candidate values.

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