WO2020009498A1 - Method for transmitting uplink data in unlicensed band and device therefor - Google Patents

Abstract

Disclosed are a method and a device for transmitting data in a next generation radio access network (NR) using an unlicensed band. One embodiment provides a method by which a terminal transmits uplink data in an unlicensed band, and a device, the method comprising the steps of: receiving, from a base station, a plurality of pieces of subband configuration information about a bandwidth part constituting the unlicensed band; receiving downlink control information including uplink scheduling information about a plurality of subbands; determining a subband for transmitting uplink data on the basis of a result of an LBT operation, for each of one or more subbands, performed on the basis of uplink scheduling information; and transmitting uplink data in at least one determined subband in the bandwidth part.

Description

Method and apparatus for transmitting uplink data in unlicensed band

The present disclosure relates to a data transmission method and apparatus in a next generation radio access network (NR) using an unlicensed band. In addition, the present disclosure is a technique for controlling the operation of the bandwidth part configured in the terminal.

With the increase in the spread of smart phones and the like and the various uses of wireless communication devices, the amount of data transmission and reception using wireless communication technology is increasing rapidly. In addition, with the importance of low latency, development of the next generation wireless communication technology (New RAT) after LTE technology is in progress.

Meanwhile, technology development for providing a wireless communication service using an unlicensed band rather than a licensed band previously used exclusively by each service provider is in progress. In particular, in the case of the unlicensed band, since a short range wireless communication protocol can be used at the same time, various technologies have been developed for coexistence of a mobile communication protocol and a short range wireless communication protocol.

In view of this, the conventional mobile communication technology provides a communication service to a user by using an unlicensed band as an auxiliary cell. However, as the next generation wireless communication technology is developed, research into a technology for providing a mobile communication service using only an unlicensed band is in progress. In particular, in the case of providing a communication service centered on an unlicensed band, an additional procedure necessary for coexistence with other communication protocols may increase the possibility of causing problems in ensuring the quality of mobile communication services. Therefore, the development of an unlicensed band data transmission and reception procedure to prevent such a problem is required.

In addition, the next-generation wireless communication technology may support wideband operation by expanding the frequency resources available to the terminal. However, when the terminal uses a wide frequency axis resources according to the broadband operation, there is a possibility that excessive power consumption occurs if the unlicensed band is included in the frequency axis resources. That is, as the frequency resources that are the targets of the frequency occupancy check operation for coexistence with other wireless communication technologies become wider, excessive power waste may occur in the terminal. Accordingly, there is a need for a technology development capable of supporting broadband operation while preventing unnecessary power waste of the terminal.

Disclosure of Invention The present disclosure devised in the above background provides a method and apparatus for effectively transmitting uplink data using an unlicensed band in a next generation wireless communication system supporting broadband operation.

In addition, the present embodiments may provide a method and apparatus for controlling the operation of a plurality of bandwidth parts configured in a terminal.

According to an embodiment of the present invention, in a method for transmitting uplink data in an unlicensed band by a terminal, receiving a plurality of subband configuration information for a bandwidth part configured in the unlicensed band from a base station and a plurality of Receiving downlink control information including uplink scheduling information for a subband and transmitting uplink data based on a result of performing an LBT operation on each of one or more subbands based on the uplink scheduling information. Determining a subband and transmitting uplink data in at least one subband determined within the bandwidth part.

In addition, according to an embodiment of the present invention, in a method for receiving uplink data in an unlicensed band, a base station transmits a plurality of subband configuration information for a bandwidth part configured in an unlicensed band and uplinks a plurality of subbands. Transmitting downlink control information including link scheduling information and receiving uplink data in at least one subband determined based on a result of the LBT operation performed by the UE for each of one or more subbands in the bandwidth part. It provides a method comprising the steps of.

In addition, an embodiment is a terminal for transmitting uplink data in an unlicensed band, receiving a plurality of subband configuration information for the bandwidth part configured in the unlicensed band from the base station, and uplink scheduling information for the plurality of subbands A control unit and bandwidth for determining a subband for transmitting the uplink data based on the result of performing the LBT operation for each of the one or more subbands based on the receiving unit for receiving the downlink control information including the uplink scheduling information Provided is a terminal device including a transmitter for transmitting uplink data in at least one subband determined within a part.

In addition, according to an embodiment of the present invention, a base station receiving uplink data in an unlicensed band transmits a plurality of subband configuration information about a bandwidth part configured in an unlicensed band to a terminal, and uplink scheduling information for a plurality of subbands. A transmitter for transmitting downlink control information including a receiver and a receiver for receiving uplink data in at least one subband determined based on a result of the LBT operation performed by the UE for each of the one or more subbands, respectively. It provides a base station apparatus comprising.

In addition, according to an embodiment of the present invention, in a method of controlling an operation of a bandwidth part (BWP), a terminal receives bandwidth part configuration information for configuring a plurality of bandwidth parts in one cell and a plurality of bandwidth parts. Receiving activation indication indicating activation for at least two bandwidth parts of the bandwidth parts and controlling a timer for starting a deactivate timer for each of the two or more bandwidth parts indicated for activation. can do.

In addition, according to an embodiment of the present invention, a method for controlling an operation of a bandwidth part (BWP) by a base station includes: transmitting bandwidth part configuration information for configuring a plurality of bandwidth parts to a cell and a plurality of information to a terminal; And transmitting activation indication information indicating activation for at least two bandwidth parts of the bandwidth parts, wherein the terminal provides a method of starting a deactivate timer for each of the two or more bandwidth parts indicated for activation. Can be.

In addition, an embodiment of the present invention provides a terminal for controlling the operation of a bandwidth part (BWP), receiving bandwidth part configuration information for configuring a plurality of bandwidth parts in one cell from a base station, and among the plurality of bandwidth parts. A terminal device may include a receiver configured to receive activation indication information indicating activation of at least two bandwidth parts and a controller configured to start a deactivate timer for each of the at least two bandwidth parts indicated by activation.

In addition, an embodiment of the present invention provides a base station for controlling an operation of a bandwidth part (BWP), and transmits bandwidth part configuration information for configuring a plurality of bandwidth parts in one cell to a terminal, and among the plurality of bandwidth parts. And a transmitter for transmitting activation indication information indicating activation of at least two bandwidth parts, and a controller for generating configuration information and activation indication information, wherein the terminal deactivates each of at least two bandwidth parts indicated for activation. A base station apparatus for starting a timer can be provided.

The present disclosure provides an effect of efficiently transmitting uplink data using an unlicensed band in a next generation wireless communication system supporting wideband operation.

In addition, according to the present embodiments, it is possible to provide an effect of efficiently controlling a plurality of bandwidth parts.

1 is a diagram schematically illustrating a structure of an NR wireless communication system to which an embodiment of the present invention may be applied.

2 is a view for explaining a frame structure in an NR system to which the present embodiment can be applied.

3 is a diagram for describing a resource grid supported by a radio access technology to which the present embodiment can be applied.

FIG. 4 is a diagram for describing 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 the present embodiment can be applied.

7 is a diagram for describing an operation of a terminal, according to an exemplary embodiment.

8 is a diagram for describing an operation of a base station according to an exemplary embodiment.

9 and 10 are diagrams for describing various configurations of a bandwidth part, according to an exemplary embodiment.

11 illustrates a subband configuration and uplink data transmission resources according to an embodiment.

12 is a diagram for describing a terminal configuration, according to an exemplary embodiment.

13 is a diagram illustrating a configuration of a base station according to an embodiment.

14 is a diagram illustrating an example in which N bandwidth parts are configured in one element carrier according to an embodiment.

15 is a diagram for describing an operation of a terminal, according to an exemplary embodiment.

16 is a view for explaining a terminal operation according to another embodiment.

17 illustrates an operation of a base station according to an embodiment.

18 is a diagram illustrating a bandwidth part information element of an RRC message according to an embodiment.

19 illustrates a field structure of a MAC CE according to an embodiment.

20 is a diagram illustrating a field structure of a MAC CE according to another embodiment.

21 is a diagram illustrating an example of a terminal configuration.

22 is a diagram illustrating a configuration of a base station according to an embodiment.

Some embodiments of the present disclosure are described in detail below 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 shown in different drawings. In addition, in describing the present embodiments, when it is determined that a detailed description of a related known configuration or function may obscure the gist of the present invention, the detailed description may be omitted. When "include", "have", "consist", or the like, as used herein, other parts may be added unless "only" is used. In the singular form, the plural may include the plural unless specifically stated otherwise.

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

In the description of the positional relationship of components, when two or more components are described as being "connected", "coupled" or "connected", the two or more components are directly "connected", "coupled" or "connected". It may be understood, however, that two or more components and other components may be further “interposed” and “connected”, “coupled” or “connected”. Here, the 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 relations with respect to the components, the operation method, the fabrication method, and the like, for example, the temporal and posterior relations are described as "after", "following", "after", "before", and the like. Or where flow-benefit relationships are described, they may also include cases where they are not continuous unless "right" or "direct" is used.

On the other hand, if a numerical value or corresponding information (e.g., a level, etc.) for the component is mentioned, the numerical value or the corresponding information may be various factors (e.g., process factors, internal or external shocks, It may be interpreted as including an error range that may be caused by noise).

The wireless communication system herein 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 embodiments disclosed below can be applied to a wireless communication system using various radio access technologies. For example, embodiments of the present invention may include code division multiple access (CDMA), frequency division multiple access (FDMA), timedivision multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single carrier frequency division multiple access (SC-FDMA). Alternatively, the present invention may be applied to various 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 wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented in wireless technologies such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA), and the like. IEEE 802.16m is an evolution of IEEE 802.16e and provides backward compatibility with systems based on IEEE 802.16e. UTRA is part of a universal mobile telecommunications system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is part of evolved UMTS (E-UMTS) using evolved-UMTS terrestrial radio access (E-UTRA), employing OFDMA in downlink and SC- in uplink FDMA is adopted. As such, the embodiments may be applied to a wireless access technology that is currently disclosed or commercialized, and may be applied to a wireless access technology that is currently under development or will be developed in the future.

On the other hand, the terminal in the present specification is a comprehensive concept that means a device including a wireless communication module for communicating with a base station in a wireless communication system, WCDMA, LTE, NR, HSPA and IMT-2020 (5G or New Radio) In addition to the user equipment (UE), as well as MS (Mobile Station), User Interface (UT), Subscriber Station (SS), wireless device (wireless device) and the like in GSM should be interpreted. In addition, the terminal may be a user portable device such as a smart phone according to a usage form, and may mean a vehicle, a device including a wireless communication module in a vehicle, and the like in a V2X communication system. In addition, in the case of a 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 a cell of the present specification refers to an end point that communicates with a terminal in terms of a network, and includes a Node-B, an evolved Node-B, an eNB, a gNode-B, a Low Power Node, and an LPN. Sector, site, various types of antenna, base transceiver system (BTS), access point, access point (for example, transmission point, reception point, transmission point and reception point), relay node ), A mega cell, a macro cell, a micro cell, a pico cell, a femto cell, a remote radio head (RRH), a radio unit (RU), and a small cell. In addition, the cell may mean a bandwidth part (BWP) in the frequency domain. For example, the serving cell may mean an activation BWP of the terminal.

Since the above-mentioned various cells have a base station that controls one or more cells, the base station may be interpreted in two meanings. 1) the device providing the mega cell, the macro cell, the micro cell, the pico cell, the femto cell, the small cell in relation to the wireless area, or 2) the wireless area itself. In 1) all devices that provide a given radio area are controlled by the same entity or interact with each other to cooperatively configure the radio area to the base station. According to the configuration of the wireless area, a point, a transmission point, a transmission point, a reception point, and the like become one embodiment of a base station. In 2), the base station may indicate the radio area itself that receives or transmits a signal from a viewpoint of a user terminal or a neighboring base station.

In the present specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission / reception point or a signal transmitted from a transmission point or a transmission / reception point, and the transmission / reception point itself. Can be.

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

The uplink and the downlink transmit and receive control information through a control channel such as a physical downlink control channel (PDCCH), a physical uplink control channel (PUCCH), a physical downlink shared channel (PDSCH), a physical uplink shared channel (PUSCH), and the like. Data is transmitted and received by configuring the same data channel. Hereinafter, a situation in which signals are transmitted and received through channels such as PUCCH, PUSCH, PDCCH, and PDSCH may be described in the form of 'transmit and receive PUCCH, PUSCH, PDCCH and PDSCH'. do.

For clarity, the following description focuses on the 3GPP LTE / LTE-A / NR (New RAT) communication system, but the present technical features are not limited to the communication system.

After researching 4G (4th-Generation) communication technology, 3GPP develops 5G (5th-Generation) communication technology to meet the requirements of ITU-R's next generation wireless access technology. Specifically, 3GPP develops a new NR communication technology separate from LTE-A pro and 4G communication technology, which is an enhancement of LTE-Advanced technology to the requirements of ITU-R with 5G communication technology. Both LTE-A pro and NR mean 5G communication technology. Hereinafter, 5G communication technology will be described based on NR when a specific communication technology is not specified.

Operational scenarios in NR defined various operational scenarios by adding considerations to satellites, automobiles, and new verticals in the existing 4G LTE scenarios.In terms of services, they have eMBB (Enhanced Mobile Broadband) scenarios and high terminal density. Supports a range of mass machine communication (MMTC) scenarios that require low data rates and asynchronous connections, and Ultra Reliability and Low Latency (URLLC) scenarios that require high responsiveness and reliability and support high-speed mobility. .

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

<NR system general>

1 is a diagram schematically illustrating a structure of an NR system to which the present embodiment may be applied.

Referring to FIG. 1, an NR system is divided into a 5G core network (5GC) and an NR-RAN part, and the NG-RAN controls a user plane (SDAP / PDCP / RLC / MAC / PHY) and a user equipment (UE). It consists of gNB and ng-eNBs providing a planar (RRC) protocol termination. The gNB interconnects or gNBs and ng-eNBs are interconnected via an Xn interface. gNB and ng-eNB are each connected to 5GC through the NG interface. The 5GC may be configured to include an access and mobility management function (AMF) that is in charge of a control plane such as a terminal access and mobility control function, and a user plane function (UPF), which is in charge of a control function in user data. NR includes support for sub-6 GHz frequency bands (FR1, Frequency Range 1) and 6 GHz and higher frequency bands (FR2, Frequency Range 2).

gNB means a base station providing the NR user plane and control plane protocol termination to the terminal, ng-eNB means a base station providing the E-UTRA user plane and control plane protocol termination to the terminal. The base station described in the present specification should be understood to mean gNB and ng-eNB, and may be used to mean gNB or ng-eNB.

<NR waveform, pneumatic and frame structure>

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

On the other hand, in NR, since the requirements for data rate, delay rate, and coverage are different for each of the three scenarios described above, it is necessary to efficiently satisfy the requirements for each scenario through a 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, the NR transmission neuron is determined based on sub-carrier spacing and cyclic prefix (CP), and μ is used as an exponent value of 2 based on 15 kHz as shown in Table 1 below. Is changed to.

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's neuronality may be classified into five types according to the subcarrier spacing. This is different from the fixed subcarrier spacing of LTE, one of the 4G communication technologies. Specifically, the subcarrier spacing used for data transmission in NR is 15, 30, 60, 120 kHz, and the subcarrier spacing used for synchronous signal transmission is 15, 30, 12, 240 kHz. In addition, the extended CP applies only to 60 kHz subcarrier intervals. On the other hand, the frame structure (frame) in NR is a frame having a length of 10ms consisting of 10 subframes having the same length of 1ms (frame) is defined. One frame may be divided into half frames of 5 ms, and each half frame includes five subframes. In case of 15 kHz subcarrier spacing, one subframe consists of one slot, and each slot consists of 14 OFDM symbols. 2 is a view for explaining a frame structure in an NR system to which the present embodiment can be applied.

Referring to FIG. 2, the slot is fixedly configured with 14 OFDM symbols in the case of a normal CP, but the length of the slot may vary depending on the subcarrier spacing. For example, in the case of a newerology with a 15khz subcarrier spacing, the slot has a length of 1 ms and the same length as the subframe. On the contrary, in the case of a numerology having a 30khz subcarrier spacing, the slot includes 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 with a fixed time length, the slot is defined by the number of symbols, 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 subslot or non-slot based schedule) to reduce transmission delay of a radio section. The use of a wide subcarrier spacing shortens the length of one slot in inverse proportion, thereby reducing the transmission delay in the radio section. The mini slot (or sub slot) is for efficient support for the URLLC scenario and can be scheduled in units of 2, 4, and 7 symbols.

In addition, unlike LTE, NR defines uplink and downlink resource allocation at a symbol level in 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 combination of various slots supports a common frame structure constituting an FDD or TDD frame. 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 symbol and uplink symbol are combined are supported. NR also supports that data transmission is distributed and scheduled in one or more slots. Accordingly, the base station can inform the terminal whether the slot is a downlink slot, an uplink slot, or a flexible slot by using a slot format indicator (SFI). The base station may indicate a slot format by indicating an index of a table configured through UE-specific RRC signaling using SFI, and may indicate the slot format dynamically through DCI (Downlink Control Information) or statically through RRC. You can also specify quasi-statically.

<NR Physical Resource>

With regard to physical resources in NR, antenna ports, resource grids, resource elements, resource blocks, bandwidth parts, etc. are considered do.

The antenna port is defined such that the channel on which the symbol is carried on the antenna port can be inferred from the channel on which another symbol on the same antenna port is carried. If the large-scale property of a channel carrying a symbol on one antenna port can be deduced from the channel carrying the symbol on another antenna port, then the two antenna ports are quasi co-located or QC / QCL. quasi co-location relationship. Here, the broad characteristics include one or more of delay spread, Doppler spread, frequency shift, average received power, and received timing.

3 is a diagram for describing a resource grid supported by a radio access technology to which the present embodiment can be applied.

Referring to FIG. 3, since the Resource Grid supports a plurality of numerologies in the same carrier, a resource grid may exist according to each numerology. In addition, the resource grid may exist according to antenna ports, subcarrier spacing, and transmission direction.

The resource block is composed 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 shown in FIG. 3, one resource block may vary in size depending on the subcarrier spacing. In addition, the NR defines "Point A" serving as a common reference point for the resource block grid, a common resource block, a virtual resource block, and the like.

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

In NR, unlike LTE, where 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 a carrier bandwidth and used by a UE. In addition, the bandwidth part is associated with one neuralology and consists of a subset of consecutive common resource blocks and can be dynamically activated over time. The UE is configured with up to four bandwidth parts, respectively, uplink and downlink, and data is transmitted and received using the bandwidth part activated at a given time.

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

<NR initial connection>

In NR, the UE performs a cell search and random access procedure to access and communicate with a base station.

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

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 is composed of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), which occupy one symbol and 127 subcarriers, respectively, three OFDM symbols, and a PBCH spanning 240 subcarriers.

The terminal monitors the SSB in the time and frequency domain to receive the SSB.

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

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

On the other hand, 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 even where the center of the system band is not, and when supporting broadband operation, a plurality of SSBs may be transmitted in the frequency domain. Accordingly, the terminal monitors the SSB using a synchronization raster, which is a candidate frequency position for monitoring the SSB. The carrier raster and the synchronization raster, which are the center frequency position information of the channel for initial access, are newly defined in the NR, and the synchronization raster has a wider frequency interval than the carrier raster, and thus supports fast SSB search of the terminal. Can be.

The UE may acquire the MIB through the PBCH of the SSB. The Master Information Block (MIB) includes minimum information for the UE to receive the remaining system information (RMSI) that the network broadcasts. In addition, the PBCH is information on the position of the first DM-RS symbol in the time domain, information for the UE to monitor SIB1 (for example, SIB1 neuronological 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 neuronological information is equally applied to some messages used in a random access procedure for accessing a base station after the terminal completes a cell search procedure. For example, the neuralology information of SIB1 may be applied to at least one of messages 1 to 4 for the random access procedure.

The aforementioned RMSI may refer to System Information Block 1 (SIB1), which is broadcast periodically (ex, 160ms) in a cell. SIB1 includes information necessary for the UE to perform an initial random access procedure and is periodically transmitted through the PDSCH. In order to receive the SIB1, the UE needs to receive the information of the neuterology used for the SIB1 transmission and the control resource set (CORESET) information used for the scheduling of the SIB1 through the PBCH. The UE checks scheduling information on SIB1 using SI-RNTI in CORESET and acquires SIB1 on PDSCH according to the scheduling information. The remaining SIBs other than SIB1 may be transmitted periodically or may be transmitted at the request of the terminal.

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

Referring to FIG. 6, when the cell search is completed, the terminal transmits a random access preamble for random access to the base station. The random access preamble is transmitted on the PRACH. Specifically, the random access preamble is transmitted to the base station through a PRACH composed of consecutive 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 a UE performs random access 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 terminals, a random access preamble identifier may be included to indicate to 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, a Random Access-Radio Network Temporary Identifier (RA-RNTI).

Upon receiving the valid random access response, the terminal processes the information included in the random access response and performs the scheduled transmission to the base station. For example, the terminal applies a TAC and stores a temporary C-RNTI. In addition, by using the UL Grant, data or newly generated data stored in the buffer of the terminal is transmitted to the base station. In this case, information that can identify 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 control resource set (CORESET) having a length of 1 to 3 symbols, and transmits up / down scheduling information, slot format index (SFI), and transmit power control (TPC) information. .

As such, the NR introduces the concept of CORESET to ensure system flexibility. CORESET (Control Resource Set) means a time-frequency resource for the downlink control signal. The terminal may decode the control channel candidate using one or more search spaces in the CORESET time-frequency resource. A QCL (Quasi CoLocation) assumption is set for each CORESET, which is used to inform the analog beam direction in addition to delay spread, Doppler spread, Doppler shift, and average delay, which are assumed by conventional QCL.

In this specification, frequency, frame, subframe, resource, resource block, region, band, subband, control channel, data channel, synchronization signal, various reference signals, various signals or various messages related to NR (New Radio) Can be interpreted as meaning used in the past or present, or various meanings used in the future.

In addition, in the present specification, a bandwidth consisting of a predetermined frequency section within a carrier bandwidth is described as a bandwidth part, a band whistle part, or a BWP, and the term is not limited thereto. In addition, although a bandwidth consisting of a predetermined frequency section in the bandwidth part is described as a subband, it is not limited to the term.

In addition, the subband configuration information below is an arbitrary term meaning information necessary for configuring a subband, and is not limited to the term, described in various terms that may indicate the same meaning. Similarly, the LBT configuration information means a necessary information in performing the LBT by the terminal. If the term indicates the same meaning, the LBT configuration information is not limited thereto and may be used interchangeably.

In addition, hereinafter, for convenience of description, a description will be given as an example of List Before Talk (LBT) as a technology for coexistence between wireless communication technologies in an unlicensed band, but the present disclosure may be applied to various coexistence technologies. Of course, the present disclosure may be applied not only to 5G or NR technology, which is a next generation wireless communication technology, but also to various wireless communication technologies such as 4G and Wifi.

LTE Licensed Assisted Access

3GPP discussed the technology for using LTE technology in the unlicensed band. As a result of the discussion, the technology supporting only downlink in the unlicensed band was completed in 3GPP Release 13, and in Release 14, a standard supporting additional uplink was completed.

Meanwhile, two methods may be used as an unlicensed band UL channel access method. In the Type-1 uplink channel access method, channel access priority is determined according to QoS of data included in the PUSCH transmitted by the UE, and LBT is performed using a given parameter value according to the priority and channel access / occupation procedure. Is performed. The type-2 uplink channel access method determines whether the channel is available by only one channel sensing during the Tshort_ul period during transmission of the uplink data channel, and transmits the PUSCH by occupying the channel. Here, if Tshort_ul = 25us used to perform LBT and the channel is sensed as “usable” during the Tshort_ul period, the channel is considered to be available and the UE occupies the corresponding channel and transmits the PUSCH.

For PUSCH transmission, the base station indicates an uplink channel access type (UL channel access type-1 or type-2) and a channel access priority class to the terminal with UL grant information. . The UE performs a channel access procedure according to an uplink channel access type that has received a corresponding indication for uplink data transmission through a PUSCH.

Unlike a method in which a UE performs PUSCH transmission using a licensed band, it is necessary to increase the opportunity of PUSCH transmission in an unlicensed band. To this end, both a scheme of transmitting a PUSCH using a single subframe and a scheme of transmitting a PUSCH using a plurality of subframes may be used. As in the licensed band, both TM1 and TM2 are supported as a transmission mode for PUSCH transmission. DCI format 0A / DCI format 0B is used for DCI for scheduling transmission of a single subframe / multiple subframes to TM1, respectively. DCI format 4A / DCI format 4B is used for DCI for scheduling transmission of a single subframe / multiple subframes to TM2, respectively.

In addition, the base station may flexibly indicate the transmission timing of the PUSCH from 4ms to 20ms based on the minimum delay time (ex, 4ms) when scheduling the PUSCH in the unlicensed band. To this end, the base station may indicate a flexible transmission timing by adding a field called a timing offset to each uplink grant information.

In addition, the base station may schedule the PUSCH to the UE through two triggering types (type-A, type-B). Triggering type A includes all information on PUSCH transmission in uplink grant information and indicates PUSCH transmission to the UE by including absolute PUSCH transmission timing information, which is the same as in the existing licensed band. Triggering type B includes all information on PUSCH transmission in uplink grant information and transmits the information including relative PUSCH transmission timing information. Here, the timing information actually transmitted is determined by the indicator of the PUSCH trigger B transmitted when the C-PDCCH is received and 'UL duration and offset' information.

Bandwidth Part operations

As described above, NR, a next generation radio access technology (ex, 5G radio access technology), newly introduced the concept of bandwidth part. In the existing LTE system, scalable bandwidth operation for any component carrier (CC) was supported. That is, according to the frequency deployment scenario (deployment scenario) in any LTE carrier to configure a single LTE CC, a minimum of 1.4 MHz to a maximum of 20 MHz can be configured in the bandwidth, the normal LTE terminal in one LTE CC It supports transmission and reception capability of 20 MHz bandwidth.

However, in the case of NR, it is designed to support NR terminals having different transmit / receive bandwidth capabilities through one wideband NR CC. Accordingly, one or more bandwidth parts (s) configured with bandwidths granular for any NR CC may be configured. Accordingly, different bandwidth part configuration and activation operations are supported for each terminal, thereby supporting flexible broadband bandwidth operations.

In more detail, in NR, one or more bandwidth parts may be configured through one serving cell configured from a terminal perspective. The UE may be used for uplink / downlink data transmission and reception by activating one DL bandwidth part and one UL bandwidth part in the corresponding serving cell. In addition, when a plurality of serving cells are configured in the corresponding UE (ie, carrier aggregation (CA) is applied), uplink / downlink data transmission / reception is performed by activating one DL bandwidth part and / or UL bandwidth part for each serving cell. Can be used for

In more detail, a first / initial bandwidth part for an initial access procedure of a terminal may be defined in any serving cell. One or more UE-specific bandwidth parts (s) are configured through dedicated RRC signaling for each UE. In addition, a default bandwidth part for the fallback operation may be defined for each terminal.

However, the current NR specification is defined to activate and use only one DL bandwidth part and UL bandwidth part at any time in any terminal.

NR-U (Unlicensed spectrum)

Unlike licensed bands, unlicensed bands are available for the provision of wireless communication services by any operator or individual within the regulation of each country, rather than a wireless channel exclusively used by any operator. Accordingly, when NR service is provided through an unlicensed band, there is a need to solve a co-existence problem with various short range wireless communication protocols such as WiFi, Bluetooth, and NFC that are already provided through the unlicensed band. In addition, there is a need to solve the problem of co-existence between respective NR operators or LTE operators.

Accordingly, when providing NR service through an unlicensed band, coexistence technology is required to avoid interference or collision between respective wireless communication services. For example, before transmitting a radio signal, a wireless channel access based on List Before Talk (LBT), which senses a power level of a radio channel or carrier to be used and determines whether the radio channel or carrier is available. It is necessary to support the method. In this case, if a specific radio channel or carrier of the unlicensed band is in use by another wireless communication protocol or another operator, there is a possibility that it is restricted from providing NR service through the corresponding band. Therefore, unlike the wireless communication service through the unlicensed band, the wireless communication service through the unlicensed band is difficult to guarantee the QoS required by the user. In particular, NR-U can support a stand-alone NR-U cell as an unlicensed band NR deployment scenario unlike the existing LTE, which must support an unlicensed band through a CA with a licensed band. In this case, a stand-alone NR-U cell or a licensed NR cell or LTE cell needs to satisfy an appropriate QoS.

As mentioned above, no technology for unlicensed band operation in NR was supported. In particular, NR supporting broadband operation has a problem that it is difficult to transmit data satisfying appropriate QoS as LBT is performed in broadband according to the regulation of unlicensed band. The present disclosure devised to solve this problem is to provide a method and apparatus for effectively transmitting uplink data in the NR supporting broadband operation.

For convenience of description, the present embodiment will be described below with reference to NR. However, this is only for convenience of description and the present invention may be applied to LTE or another wireless access network, which is also included in the scope of the present invention. The invention is also applicable to general NR access techniques that use licensed bands. The invention may also be used in one or more of the following unlicensed band implementation environments.

NR-U LAA: NR-U in "license assisted access" mode where primary cell is NR licensed

NR-U SA: NR-U stand-alone mode

ENU-DC: EN-DC where SN (Secondary Node) is NR-U

NNU-DC: DC between NR licensed (MN: Master Node) and NR-U (SN)

As described above, since NR-U needs to support LBT, it may be difficult to guarantee access to a wireless channel. Accordingly, data transmission and reception satisfying an appropriate QoS level may be difficult.

LTE LAA supports LTE operation in the unlicensed band by defining frame type 3, a new frame structure consisting of non-empty subframes for data transmission and empty subframes for no data transmission, unlike existing LTE frames. . In order to configure a non-empty subframe, access / occupancy of the channel is determined through CCA (Clear Channel Assessment) in an empty subframe (section in which data is not transmitted), and channel occupancy and use are performed according to the CCA result. The data transmission time composed of non-empty subframes cannot exceed the maximum allowable time. It is only possible to transmit additional bursts of data within the maximum channel time allowed. LTE transmission is performed in a subframe unit (1 ms), but CCA is performed in a time unit (a few μs) smaller than a subframe (1 ms). Therefore, the channel occupancy can be configured at any point in the subframe other than the start point of the subframe, and the last point in time may be any point in the subframe due to the maximum allowable channel occupancy time constraint.

Meanwhile, in NR, a frame structure similar to the above-described LTE LAA may be defined. However, in the case of NR, at least one time unit is supported in configuring a scheduling unit in a time domain for numerology having different subcarrier spacing values. For example, 14 OFDM symbols of 15 kHz Sub-Carrier Spacing (SCCS) based normal CP overhead, which is the same as LTE, may be used as reference numerology for defining a subframe duration. In this case, a frame structure when a single subframe duration is configured to have a time duration of 1 ms may be defined. In addition, a frame structure based on slots and mini-slots may be defined as a time unit based on actual uplink / downlink data scheduling. In this case, the y value, which is the number of OFDM symbols constituting the slot, may be determined to have a value of y = 14 regardless of the SCS value in the case of normal CP. In addition, in any numerology (or SCS), a mini-slot consisting of fewer than 14 slots may be defined, and a mini-slot based frame structure may be defined.

In the PUSCH transmission technology for uplink unlicensed band LTE operation, both a scheme of transmitting a PUSCH using a single subframe and a scheme of transmitting a PUSCH using a plurality of subframes may be used. When the base station schedules the PUSCH in the unlicensed band, the base station is based on a minimum delay time of at least 4 ms. In order to flexibly operate the transmission timing of the PUSCH, a timing offset is applied to each uplink grant information from 4 ms to 20 ms. Field) may be indicated to the terminal. As such, the existing LTE technology provided data transmission by extending the channel use opportunity on the time base.

NR, on the other hand, supports broadband operation. If a wideband BWP is configured in the terminal, the terminal may perform LBT in the corresponding BWP. However, the wider the band for performing LBT, the greater the probability of LBT failure in the corresponding BWP, thereby increasing the possibility of deterioration of data transmission performance.

Therefore, the embodiments described below describe a method of transmitting uplink data in an unlicensed band through the LBT operation of a terminal configured with a BWP. As described above, LBT is only described as an example of coexistence technology, and various open coexistence technologies may be applied. In addition, the same can be applied to the LBT operation of the base station for the downlink data transmission as well as the LBT of the terminal for uplink data transmission, in this case, the various configuration information transmitted by the base station to the terminal does not transmit itself Can be created and checked.

7 is a diagram for describing an operation of a terminal, according to an exemplary embodiment.

Referring to FIG. 7, in a method of transmitting uplink data in an unlicensed band, the terminal may perform a step of receiving a plurality of subband configuration information for the bandwidth part configured in the unlicensed band from the base station (S700). .

For example, in order to reduce the frequency axis range of the LBT to be performed by the terminal, the base station may divide the bandwidth part set in the terminal into a plurality of subbands. To this end, the subband configuration information may be set for each bandwidth part. That is, when four bandwidth parts are configured in the terminal, the number, location, size, etc. of the subbands may be the same or different for each bandwidth part. If the bandwidth part is not configured, the corresponding uplink carrier may be divided into a plurality of subbands.

For example, the subband configuration information includes at least one of the number of subbands in each bandwidth part, the bandwidth of the subband, the size of the subband and the number of PRBs of the subband, and the bandwidth part identification information mapped to each subband. It may include.

In addition, the subband configuration information may be included in higher layer signaling. The higher layer signaling including the subband configuration information may include LBT configuration information for each subband for performing the LBT operation in each subband. For example, higher layer signaling may include LBT configuration information including information (eg, a threshold value, etc.) required for the UE to perform LBT in each subband. The LBT configuration information may include different parameters for each subband, or the same parameter may be set without distinguishing subbands.

In detail, the LBT configuration information may include a parameter defined as a different value for each subband. Alternatively, the LBT configuration information may include a parameter defined by the same value in subbands configured in the same bandwidth part. Alternatively, the LBT configuration information may include a parameter that is defined with the same value in all the bandwidth parts configured in the terminal. The subband configuration information and the LBT configuration information will be described in more detail in the following detailed exemplary embodiments.

The UE may perform downlink control information including uplink scheduling information for a plurality of subbands (S710). The terminal receives the uplink scheduling information from the base station in order to transmit the uplink data in the activated bandwidth part.

Here, since the bandwidth part may be composed of a plurality of subbands as described above, uplink scheduling information for the plurality of subbands may be received through one downlink control information.

For example, the downlink control information may include a redundancy version (RV) field for each of the plurality of subbands. Here, the RV field may be set differently between the plurality of subbands.

As another example, the downlink control information may include HARQ process ID information for each of the plurality of subbands. Here, the HARQ process ID information may be set to increase by 1 according to the scheduling order based on the first subband scheduled by the uplink scheduling information. Specifically, when resources of a plurality of subbands are scheduled by uplink scheduling information included in the downlink control information, HARQ process ID information of a subband including the first scheduled resource may be set to N. FIG. . Subsequently, HARQ process ID information of a subband including a resource scheduled for the second time by the same downlink control information may be set to N + 1. Through this process, when uplink scheduling is performed for K subbands, HARQ process IDs from N to N + (K-1) may be set according to the scheduling order according to the order.

Meanwhile, the downlink control information includes subband indication information indicating one or more subbands that are the target of LBT operation, bandwidth part indication information indicating the bandwidth part including one or more subbands that are the target of LBT operation, and uplink. It may include at least one of frequency domain resource allocation information for link data transmission and time domain resource allocation information for uplink data transmission.

The UE may perform a step of determining a subband for transmitting uplink data based on a result of performing the LBT operation on each of the one or more subbands based on the uplink scheduling information (S720).

For example, the terminal performs an LBT operation on radio resources allocated to the terminal by uplink scheduling information. The LBT operation may include an operation of sensing an energy level of a corresponding radio resource and comparing the sensed energy level with a preset reference energy level.

Alternatively, the terminal may determine a subband to transmit uplink data based on an energy level value for each subband and a subband selection rule measured as a result of performing the LBT operation.

Here, the subband selection rule may be indicated by the base station or preset in the terminal. For example, the subband selection rule may be set based on at least one of subband index information, reference signal reception information for each subband, base station indication information, and default subband presence information.

That is, when uplink data transmission is possible in one subband as a result of performing the LBT operation on the plurality of subbands, the terminal transmits uplink data through the corresponding subband. In contrast, when uplink data transmission is possible in two or more subbands as a result of performing LBT on the plurality of subbands, uplink data is transmitted using one or more subband radio resources according to the aforementioned subband selection rule. Can be. For example, the terminal selects a subband having the lowest or highest subband index, selects a subband in which a reference signal is received, or selects a subband indicated by a base station from a plurality of subbands selected as a result of performing an LBT operation. One or more subbands may be selected according to a subband selection rule, such as a selection or a subband set as a default.

The terminal may perform the step of transmitting uplink data in at least one subband determined within the bandwidth part (S730). The terminal transmits uplink data using radio resources allocated by the base station in the determined one or more subbands.

Through this, the terminal can prevent the reduction of data transmission probability that can occur due to the LBT performance on a wide frequency axis, and can satisfy the data transmission QoS using the unlicensed band. Hereinafter, the operation of the base station peered to the operation of the terminal will be described with reference to the drawings.

8 is a diagram for describing an operation of a base station according to an exemplary embodiment.

Referring to FIG. 8, in a method of receiving uplink data in an unlicensed band, the base station may perform a step of transmitting a plurality of subband configuration information about bandwidth parts configured in the unlicensed band to a terminal (S800). .

For example, the base station may divide the bandwidth part set in the terminal into a plurality of subbands. To this end, the subband configuration information may be set for each bandwidth part.

For example, the subband configuration information includes at least one of the number of subbands in each bandwidth part, the bandwidth of the subband, the size of the subband and the number of PRBs of the subband, and the bandwidth part identification information mapped to each subband. It may include.

In addition, the subband configuration information may be included in higher layer signaling and transmitted. The higher layer signaling including the subband configuration information may include LBT configuration information for each subband for performing the LBT operation in each subband. For example, higher layer signaling may include LBT configuration information including information (eg, a threshold value, etc.) required for the UE to perform LBT in each subband. The LBT configuration information may include different parameters for each subband, or the same parameter may be set without distinguishing subbands.

In detail, the LBT configuration information may include a parameter defined as a different value for each subband. Alternatively, the LBT configuration information may include a parameter defined by the same value in subbands configured in the same bandwidth part. Alternatively, the LBT configuration information may include a parameter that is defined with the same value in all the bandwidth parts configured in the terminal. The subband configuration information and the LBT configuration information will be described in more detail in the following detailed exemplary embodiments.

The base station may perform the step of transmitting downlink control information including uplink scheduling information for the plurality of subbands (S810). The base station may allocate a resource for uplink data transmission to the terminal. Resources for uplink data transmission may be indicated by time domain and frequency domain resources by uplink scheduling information. Here, since the bandwidth part may be configured of a plurality of subbands as described above, the uplink scheduling information for the plurality of subbands may be transmitted through one downlink control information.

For example, the downlink control information may include a redundancy version (RV) field for each of the plurality of subbands. Here, the RV field may be set differently between the plurality of subbands.

As another example, the downlink control information may include HARQ process ID information for each of the plurality of subbands. Here, the HARQ process ID information may be set to increase by 1 according to the scheduling order based on the first subband scheduled by the uplink scheduling information. Specifically, when resources of a plurality of subbands are scheduled by uplink scheduling information included in the downlink control information, HARQ process ID information of a subband including the first scheduled resource may be set to N. FIG. . Subsequently, HARQ process ID information of a subband including a resource scheduled for the second time by the same downlink control information may be set to N + 1. Through this process, when uplink scheduling is performed for K subbands, HARQ process IDs from N to N + (K-1) may be set according to the scheduling order according to the order.

Meanwhile, the downlink control information includes subband indication information indicating one or more subbands that are the target of LBT operation, bandwidth part indication information indicating the bandwidth part including one or more subbands that are the target of LBT operation, and uplink. It may include at least one of frequency domain resource allocation information for link data transmission and time domain resource allocation information for uplink data transmission.

The base station may perform the step of receiving uplink data in at least one subband determined based on a result of the LBT operation performed by the terminal for each of the one or more subbands in the bandwidth part (S820).

The base station may receive the uplink data from the terminal through the radio resources of the subband selected by the above-described terminal operation.

For example, the terminal may determine a subband to transmit uplink data based on an energy level value for each subband and a subband selection rule measured as a result of performing the LBT operation.

Here, the subband selection rule may be indicated by the base station or preset in the terminal. For example, the subband selection rule may be set based on at least one of subband index information, reference signal reception information for each subband, base station indication information, and default subband presence information.

That is, when uplink data transmission is possible in one subband as a result of the LBT operation performed on the plurality of subbands, the base station receives uplink data through the corresponding subband. On the contrary, when uplink data transmission is possible in two or more subbands as a result of the LBT performed by the UE for a plurality of subbands, the BS uses one or more subband radio resources selected by the above-described subband selection rule. Uplink data may be received. For example, the terminal selects a subband having the lowest or highest subband index, selects a subband in which a reference signal is received, or selects a subband indicated by a base station from a plurality of subbands selected as a result of performing an LBT operation. One or more subbands may be selected according to a subband selection rule, such as a selection or a subband set as a default.

The operations of the terminal and the base station described above have described some embodiments according to the present disclosure, and various embodiments may be performed in the corresponding operations and steps. Therefore, the following describes various embodiments in each procedure for carrying out the present invention. The information in each embodiment may be included in the above-described subband configuration information, LBT configuration information, downlink control information, subband selection rule, or the like, or may be delivered to the terminal through separate signaling.

The embodiments described below can be applied individually or through any optional combination / combination.

1. Performing LBT by configuring a plurality of subbands in one BWP

The initial active DL / UL BWP may be configured for 20 MHz for the 5 GHz band. This can be determined as a value that is approximate and quantized to the number of PRBs. The initial active DL / UL BWP may be configured for 20 MHz for the 6 GHz band.

9 and 10 are diagrams for describing various configurations of a bandwidth part (BWP) according to an embodiment. 9 and 10 illustrate, for example, the BWP, and may be configured in various ranges and numbers.

Referring to FIG. 9, two 20 MHz BWPs (BWP1 and BWP2) which do not overlap each other in a terminal within one cell bandwidth may be configured. Each BWP may have the same PRB number. That is, N1 and N2 may be the same.

Referring to FIG. 10, one 40 MHz BWP (BWP3) may be configured in a terminal within one cell bandwidth. The starting PRB0 frequency positions of BWP3 and BWP1 are the same. That is, the frequency offset between BWP3 and BWP1 may be set to be the same at a common reference point (start RB) for resource block grids in the carrier bandwidth. The PRB number of BWP3 is equal to the PBR number of BWP1 plus the PBR number of BWP1. That is, N3 = N1 + N2.

Alternatively, the terminal is configured to use BWP1, which is one of the 20 MHz BWPs, as an initial BWP, and according to the indication information indicated by downlink control information (DCI) by the base station, 40 MHz BWP (BWP3). Can be set as the active BWP. That is, the terminal may switch the active BWP according to the base station indication information.

If the UE intends to operate in the unlicensed band using 40 MHz BWP (BWP3) as the active BWP, the LBT should be performed in the entire 40 MHz BWP. In this case, the probability of LBT failure is further increased. On the contrary, even if the UE transmits uplink data using BWP3 having 40 MHz as the active BWP, if LBT is performed in each of the BWP1 20 MHz band and the BWP2 20 MHz band, the success probability of each LBT is added to the BWP3 40 MHz band. It can be greater than the probability of success by performing LBT at.

Accordingly, the base station may configure one BWP in a plurality of subbands in the terminal.

For example, the base station may divide one BWP into a plurality of subbands, and configure information in the terminal to instruct to perform LBT in each subband. One UL BWP configured for the UE may be divided into N subbands to configure a plurality of frequency resource sets for uplink data transmission. In addition, the base station may allow the terminal to perform LBT in each subband.

To this end, the base station may transmit subband configuration information for configuring a plurality of frequency resource sets in one UL BWP to the terminal.

For example, the subband configuration information includes one or more pieces of information about the number of subbands for each BWP, the bandwidth of each subband, the size of each subband, the number of PRBs of each subband, and the BWP-IDs mapped to each subband. It may include. The number of PRBs of each subband may also be determined by subcarrier spacing or the like. Accordingly, the subband configuration information includes the number of subbands for each BWP, the bandwidth of each subband, the size of each subband, the number of PRBs of each subband, the BWP-ID mapped to each subband, the subcarrier spacing information, One or more of cyclic prefix information, the first PRB constituting each subband and the number of consecutive PRBs and corresponding subband identification information (Indicator / ID / Index) may be included. Here, the first PRB constituting each subband may be indicated to the UE in the form of indicating a relative PRB offset based on the PRB indicated by the higher layer parameters offsetToCarrier and subcarrierSpacing .

As such, the subbands configured by the base station may be configured in various forms. For example, subbands configured for each BWP may be configured differently for each subband. As another example, the subbands configured for each BWP may be configured with equal bandwidths (size or number of PRBs) in the frequency domain for each subband, or with equal frequency intervals in equally arranged RB units. As another example, subbands configured for each BWP may be configured with bandwidths of different sizes for each subband. For example, if a subband index increases in ascending order from low frequency to high frequency, the size of the subband having the largest (last) subband index may be configured to have a bandwidth of a different size from the remaining subbands. Can be.

Meanwhile, an RRC message including subband configuration information or corresponding subband configuration information for configuring a plurality of frequency resource sets in a UL BWP configured by a base station may include LBT configuration information.

The LBT configuration information includes at least one of maxEnergyDetectionThreshold information for indicating an absolute maximum energy detection threshold and energyDetectionThresholdOffset information for indicating only an offset value based on a default maximum energy detection threshold. It may include one.

Alternatively, the base station may include linkage information for linking the above-described subband configuration information and LBT configuration information. Alternatively, the base station may transmit indication information for instructing (activating / linking) the LBT operation according to the LBT configuration information in the plurality of subbands. Alternatively, the base station may transmit indication information for activating or deactivating the LBT operation according to the LBT configuration information in the plurality of subbands. Alternatively, the base station may transmit information for configuring the LBT operation for each subband for a plurality of subbands included in one bandwidth part.

Meanwhile, at least one of the above-described subband configuration information, LBT configuration information, association information, and indication information may be included in the RRC message. Alternatively, at least one of subband configuration information, LBT configuration information, association information, and indication information may be indicated to the terminal through MAC CE signaling or downlink control information for quick application to the terminal. Alternatively, at least one of subband configuration information, LBT configuration information, association information, and indication information may be included in an RRC message and configured in the terminal. The base station may instruct to perform the LBT operation for each subband for the plurality of subbands through the downlink control information. The above information may be included as information that is explicitly distinguished, or may be implicitly indicated through other information elements on downlink control information that provides a related function.

Unlike the above-described scheme, the subband configuration information for one BWP configured in the terminal may be delivered in a fixed or implicit manner.

For example, the number of subbands or the size of the subbands may be defined as a fixed value. For example, when a plurality of subband functions are used, the number of subbands may be fixed to N (for example, a positive integer such as 2 or 3). In this case, the bandwidth or RB number of each BWP may be divided by a fixed number (or a fixed number of PRBs). Alternatively, when a plurality of subband functions are used, the size of the subband may be defined as a fixed value. For convenience of explanation, if a fixed value is defined for the 20 MHz band, then each BWP frequency band (or the number of PRBs in each BWP band) is replaced by the 20 MHz band (or the number of PRBs in the 20 MHz band or the maximum number of PRBs not exceeding the 20 MHz band). It is possible to construct a quotient or quotient + one subband of one or divided values of modular operation. Or, the fixed value may be indicated to the terminal through RRC signaling. Alternatively, the fixed value may be indicated to the terminal through downlink control information.

For another example, the subband configuration may be implicitly configured with a value calculated by another information element indicated to the terminal. For example, the width of the subband and the number of subbands may be determined as a function of the bandwidth of the UL BWP configured in the terminal, the bandwidth of the unlicensed band cell, or the frequency range. For example, a modular operation or division at 20 MHz may be used to set the number or size of subbands using the value corresponding to the quotient. That is, two subbands may be configured for the 40 MHz BWP. Alternatively, two subbands can be configured with bandwidths greater than or equal to 40 MHz, not including 60 MHz, and with less bandwidth. Alternatively, two subbands of 20 MHz and one subband of 20 MHz or less may be configured with a bandwidth greater than or equal to 40 MHz and not including 60 MHz, but having a bandwidth smaller than this.

연속적인 PRBs로 정의되며, 대역폭 파트에서 PRBs의 총 수에 따라 구성 가능한 서브밴드의 수가 될 수 있다. 기지국은 대역폭 파트에서 PRBs의 총 수에 따라 구성 가능한 서브밴드의 수에 대한 가용한 셋(set) 중에서 특정 값을 선택해 상위계층 시그널링 또는 하향링크 제어정보를 통해 단말로 이를 지시할 수 있다.For example, the subband

Defined as contiguous PRBs, can be the number of subbands configurable depending on the total number of PRBs in the bandwidth part. The base station may select a specific value from the available sets for the number of subbands configurable according to the total number of PRBs in the bandwidth part and indicate this to the terminal through higher layer signaling or downlink control information.

In addition, the base station may instruct the terminal in the form of a bitmap subband to perform the LBT operation in a plurality of subbands configured in the terminal. For example, when it is desired to instruct LBT execution in a specific subband, a bit value corresponding to the corresponding subband in a bitmap may be set to 1, and otherwise, may be set to 0. Such bitmap information may be included in the above-described LBT configuration information or subband configuration information.

For the convenience of description, the above-described embodiment has described a method of performing LBT by dividing a plurality of subbands within one BWP. However, this may be equally applied to performing LBT using a plurality of BWPs as subbands. Alternatively, the same may be applied to the case of performing LBT by dividing a plurality of subbands within one carrier. For example, in the above-described embodiment, the subband is replaced with the BWP, so that the base station performs LBT on each of a plurality of BWPs for one uplink grant to the UE and uses uplink data allocated from the BWP that succeeds in the LBT. Can be sent.

2. An operation of including uplink scheduling information for a plurality of subbands in one DCI and transmitting the same

As described above, when a plurality of subbands are configured in the terminal, the terminal may improve the data transmission performance by extending the channel use opportunity on the frequency axis. To this end, the base station may transmit uplink scheduling information including uplink scheduling information for a plurality of subbands in one uplink grant DCI.

For example, the PDCCH includes downlink control information (DCI) for uplink transmission on the PUSCH. The uplink grant may include modulation and coding format, resource allocation information, and HARQ information associated with at least the UL-SCH.

For example, the uplink scheduling information may include information for performing an LBT operation on a plurality of subbands. Alternatively, the uplink scheduling information may include scheduling information for transmitting data in an uplink resource having a successful LBT among a plurality of subbands.

As another example, the downlink control information including the uplink scheduling information may include one or more of the following information.

Carrier indicator information

Frequency domain resource assignment information

Information for indicating an offset between frequency domain resource allocation positions of a valid next subband for which the UE simultaneously performs LBT at a frequency domain resource allocation position of a reference (lowest index / default / start) subband;

Information for indicating a subband range or PRBs / RBs number / subband size or next subband number between a reference (lowest index / default / start) subband to perform LBT at the same time;

Time domain resource assignment information: Represents a row index of pusch-symbolallocation configured by a higher layer, where the indexed row is a slot offset (K2), the start and length indicator (SLIV), and the PUSCH mapping type. It may include one or more parameters of to be applied in the PUSCH transmission. Alternatively, the row index may include information about one or more of a PUSCH starting position and a PUSCH ending symbol.

Number of scheduled subframes / slots / mini-slots Information: Information indicating the number of TTIs performing LBT to extend transmission opportunities on the time base.

Subband identifier (index / index) information: in order to extend a transmission opportunity on the frequency axis, subband identification information or a reference (lowest index) to perform an LBT operation in addition to a subband including an allocated frequency resource or a designated subband; / Default / start subband identification.

Subband indicator set information: subband set information for performing LBT and / or data transmission to extend transmission opportunities on the frequency axis. Alternatively, the subband identification set may be indicated through higher layer signaling and DCI. For example, the base station may map a combination index for a combination of various subbands and include the corresponding combination index in the DCI to indicate to the terminal. Alternatively, a subband identification set may be set through a bitmap form as follows.

Bitmap information for indicating the number of subband sets / subbands included for LBT and / or data transmission: In case that it is desired to indicate resource allocation for LBT and / or data transmission in a specific subband, the bitmap information The bit value corresponding to the subband can be set to 1, otherwise it can be set to 0. When indicating the number of subbands may be provided as an integer value. Alternatively, the number of subbands to perform LBT in addition to the reference (lowest index / default / start) subband may be indicated.

-BWP identification (Indicator / ID / Index) information or BWP identification (Indicator / ID / Index) set information to perform the LBT: This may also be applied to the above-described mapping method by the combination of higher layer signaling and DCI, bitmap scheme It may also be indicated.

Information for instructing LBT execution and / or data transmission in a plurality of subbands or a set of frequency domain resource allocations to extend transmission opportunities on the frequency axis.

Channel access type information

Channel Access Priority Class Information

HARQ process number (ID) information: A different value for each subband may be set, and the HARQ process number for each subband may be increased by 1 according to a scheduling order for each subband.

Modulation and coding scheme

Redundancy version (RV): Each of the plurality of subbands may be set to different values.

New data indicator: A different value may be set for each of the plurality of subbands.

In the configuration of the plurality of subbands or the plurality of frequency domain resource allocation sets described above, the subband configuration embodiment described in operation 1 may be applied. The frequency domain resource set may mean a set of frequency domain resource allocations allocated for each subband / BWP / arbitrary frequency group.

In summary, in order to improve the quality of service of uplink data transmission by extending the transmission opportunity on the frequency axis, the base station classifies subbands capable of performing LBT operations in a plurality of bands, respectively, through a single DCI. In the subbands, the frequency domain resource allocation information may be indicated to the terminal. Accordingly, a plurality of uplink scheduling information capable of transmitting uplink data in each subband through one DCI can be indicated to the terminal.

For example, the same value may be applied to each subband as information except for frequency domain resource allocation information in each subband among the information included in the DCI. For example, one or more of channel access type, Channel Access Priority class, HARQ process number / ID, Modulation and coding scheme, Redundancy version, New data indication, Time domain resource assignment and Number of scheduled subframes / slot / mini-slot May be set to the same value in each subband.

As another example, in order to provide a plurality of uplink data transmission considering different channel environments, a channel access type, a channel access priority class, a HARQ process number / ID, a modulation and coding scheme, a redundancy version, a new data indication, and a time domain resource One or more pieces of information among assignment, number of scheduled subframes / slot / mini-slot may be set to different values according to the characteristics of each subband. In particular, when the LBT succeeds in a plurality of subbands, in order to transmit different data in each subband, one or more pieces of information of HARQ process number / ID and modulation and coding scheme need to be set to different values. For example, in this case, HARQ process number / ID information for each subband may be set, and may be allocated in increments of 1 according to the scheduling order as described above.

On the other hand, frequency domain resource assignment (Frequency domain resource assignment) indicates information indicating the location of the PRB / RB in the UL BWP. RB indexing for resource allocation is determined in the active BWP of the terminal. RB indexing for resource allocation may be determined in a subband indicated by a specific field of the corresponding DCI. Alternatively, when a reference (lowest index / default / start) subband is designated, RB indexing may be determined within the reference subband. Alternatively, when subbands are divided into equal bandwidths in the frequency domain for each subband, RB indexing may be determined in each subband. In this case, all subbands have the same number of PRBs / RBs. The PRB / RB positions of frequency resources allocated to the scheduled terminals in each subband become the same PRB / RB positions from each subband starting PBR / RB.

In addition, resource allocation on the frequency domain may be applied to the operations described in 3GPP TS 38.214 6.1.2.2 Resource allocation in frequency domain. For example, the resource block allocation information may include a bitmap indicating the RBG allocated to the scheduled terminal. Alternatively, the resource block allocation information may indicate a localized virtual resource block continuously allocated to the scheduled terminal. Alternatively, the resource block allocation information may be composed of a resource indication value (RIV) corresponding to a starting virtual resource block and a length of a resource block consecutively allocated.

Information for indicating an offset between the frequency domain resource allocation position of the above-described reference subband and the frequency domain resource allocation position of a valid next / following subband performing LBT simultaneously with the reference subband is a frequency allocated in each subband. This is to allow for different location assignments. That is, through this, it is possible to provide flexibility of resource allocation on the frequency axis.

For example, when the start PRB index of each subband starts from PRB0, the start PRB index of frequency domain resource allocation allocated to the reference subband (subband 1) may be PRB9. The starting PRB index of frequency domain resource allocation allocated to a valid subband (subband 2) that performs LBT following the reference subband may be PRB15. In this case, the information for indicating the aforementioned offset may be set to 6 since the resource allocation start PRB indexes of subband 1 and subband 2 differ by PBR 6. That is, the base station may indicate the resource allocation index of another subband using an offset value based on the resource allocation index of the reference subband.

For example, the start PRB index of frequency domain resource allocation for each subband in the next subband according to the scheduling order for each subband is obtained by adding an offset to the start PRB index of frequency domain resource allocation allocated to the reference subband (subband 1). This can be As another example, the start PRB index of frequency domain resource allocation for each subband in the next subband is increased by an offset to the start PRB index of frequency domain resource allocation allocated to the reference subband (subband 1) according to the scheduling order for each subband. Can be set.

As another example, the start PRB index of the frequency domain resource allocation for each subband in the next subband may be set to vary / increase / cycle in a specified pattern according to the scheduling order for each subband.

3. The UE transmits uplink data when the LBT succeeds in a plurality of subbands

The terminal may perform an LBT operation on a plurality of subbands according to the above-described embodiment. If the LBT succeeds in one subband of the plurality of subbands, the UE may transmit uplink data using resource allocation information allocated to the corresponding subband. LBT success in the present specification means a state in which a terminal performing an LBT operation may occupy an unlicensed band that is a target of performing the LBT operation. On the contrary, the LBT failure means a state in which the corresponding unlicensed band is already in use as a result of performing the LBT operation or the terminal cannot use it for a specific reason.

On the contrary, when the LBT succeeds in two or more subbands among the plurality of subbands, the UE may transmit uplink data through various operation of the following embodiments.

For example, the UE may randomly select an arbitrary subband among subbands that have succeeded in LBT, and transmit uplink data using frequency domain resource allocation information for the selected subband.

As another example, the UE may select a subband having the smallest subband index among the subbands that have succeeded in LBT, and transmit uplink data using resource allocation information for the selected subband.

As another example, the UE may select a subband having a subband index that does not receive a reference signal among subbands having succeeded in LBT, and transmit uplink data using resource allocation information for the selected subband.

As another example, the UE may select a subband having a subband index from which a reference signal is received among subbands having succeeded in LBT, and transmit uplink data using resource allocation information for the selected subband.

As another example, the UE may select a subband indicated by the base station or a subband having a predetermined default subband index among the subbands that have succeeded in LBT, and transmit uplink data using resource allocation information for the selected subband. .

As another example, the UE may transmit uplink data using resource allocation information for each subband using all subbands that have succeeded in LBT.

Resource allocation information for the selected subband is indicated by frequency domain resource assignment information included in the uplink scheduling information.

11 illustrates a subband configuration and uplink data transmission resources according to an embodiment.

Referring to FIG. 11, frequency domain resource assignment information included in uplink scheduling information may be indicated based on a value indexed in a corresponding subband. For example, when the UE performs the LBT operation in each of the subband 1 and the subband 2, and the LBT succeeds in both, the UE may select a specific subband in the above-described manner and transmit uplink data.

If subband 1 is selected, uplink data may be transmitted in PRB k and PRB k + 1 of subband 1 when frequency domain resource assignment information indicates PRB k and PRB k + 1. In contrast, even when the frequency domain resource assignment information indicates PRB k and PRB k + 1, if subband 2 is selected, uplink data may be transmitted in PRB k and PRB k + 1 in subband 2. .

That is, the frequency domain resource assignment information may indicate a value indexed in an individual subband.

As described above, when the present embodiment is applied, the terminal may provide an effect of improving the quality of service in transmitting uplink data.

12 is a diagram for describing a terminal configuration, according to an exemplary embodiment.

Referring to FIG. 12, a terminal 1200 transmitting uplink data in an unlicensed band receives a plurality of subband configuration information for a bandwidth part configured in an unlicensed band from a base station, and uplinks a plurality of subbands. A receiver 1230 for receiving downlink control information including scheduling information and a subband for transmitting uplink data based on a result of performing an LBT operation on each of one or more subbands based on the uplink scheduling information; It may include a control unit 1210 for determining and a transmitter 1220 for transmitting uplink data in at least one subband determined in the bandwidth part.

For example, the subband configuration information may be set for each bandwidth part. Specifically, the subband configuration information may include at least one information of the number of subbands in each bandwidth part, the bandwidth of the subband, the size of the subband and the number of PRBs of the subband, and the bandwidth part identification information mapped to each subband. It may include.

In addition, the receiver 1230 may receive subband configuration information through higher layer signaling. The higher layer signaling including the subband configuration information may include LBT configuration information for each subband for performing the LBT operation in each subband. For example, higher layer signaling may include LBT configuration information including information (eg, a threshold value, etc.) required for the UE to perform LBT in each subband. The LBT configuration information may include different parameters for each subband, or the same parameter may be set without distinguishing subbands.

In detail, the LBT configuration information may include a parameter defined as a different value for each subband. Alternatively, the LBT configuration information may include a parameter defined by the same value in subbands configured in the same bandwidth part. Alternatively, the LBT configuration information may include a parameter that is defined with the same value in all the bandwidth parts configured in the terminal.

In addition, the receiver 1230 may receive uplink scheduling information for a plurality of subbands through one downlink control information.

For example, the downlink control information may include a redundancy version (RV) field for each of the plurality of subbands. Here, the RV field may be set differently between the plurality of subbands. As another example, the downlink control information may include HARQ process ID information for each of the plurality of subbands. Here, the HARQ process ID information may be set to increase by 1 according to the scheduling order based on the first subband scheduled by the uplink scheduling information.

Meanwhile, the downlink control information includes subband indication information indicating one or more subbands that are the target of LBT operation, bandwidth part indication information indicating the bandwidth part including one or more subbands that are the target of LBT operation, and uplink. It may include at least one of frequency domain resource allocation information for link data transmission and time domain resource allocation information for uplink data transmission.

For example, the controller 1210 performs an LBT operation on a radio resource allocated to the terminal 1200 by uplink scheduling information. That is, the controller 1210 may sense an energy level of a corresponding radio resource and control an operation of comparing the sensed energy level with a preset reference energy level.

Alternatively, the controller 1210 may determine a subband to transmit uplink data based on an energy level value for each subband and a subband selection rule measured as a result of performing the LBT operation. Here, the subband selection rule may be indicated by the base station or preset in the terminal. For example, the subband selection rule may be set based on at least one of subband index information, reference signal reception information for each subband, base station indication information, and default subband presence information.

In addition, the controller 1210 controls the overall operation of the terminal 1200 according to the uplink data transmission operation according to the subband classification required to perform the above-described embodiments of the present invention.

In addition, the transmitter 1220 and the receiver 1230 are used to transmit and receive signals, messages, and data necessary for performing the above-described embodiment with the base station.

13 is a diagram illustrating a configuration of a base station according to an embodiment.

Referring to FIG. 13, a base station 1300 that receives uplink data in an unlicensed band transmits a plurality of subband configuration information for a bandwidth part configured in an unlicensed band to a terminal, and uplinks a plurality of subbands. Uplink data in at least one subband determined based on a result of the LBT operation performed by the UE for each of the one or more subbands in the transmitter 1320 and the bandwidth part for transmitting downlink control information including the scheduling information. It may include a receiving unit 1330 for receiving.

As described above, the subband configuration information may be set for each bandwidth part. Specifically, the subband configuration information may include at least one piece of information of the number of subbands in each bandwidth part, the bandwidth of the subband, the size of the subband and the number of PRBs of the subband, and the bandwidth part identification information mapped to each subband. It may include.

In addition, the transmitter 1320 may transmit the subband configuration information through higher layer signaling. The higher layer signaling including the subband configuration information may include LBT configuration information for each subband for performing the LBT operation in each subband. For example, higher layer signaling may include LBT configuration information including information (eg, a threshold value, etc.) required for the UE to perform LBT in each subband. The LBT configuration information may include different parameters for each subband, or the same parameter may be set without distinguishing subbands.

In detail, the LBT configuration information may include a parameter defined as a different value for each subband. Alternatively, the LBT configuration information may include a parameter defined by the same value in subbands configured in the same bandwidth part. Alternatively, the LBT configuration information may include a parameter that is defined with the same value in all the bandwidth parts configured in the terminal.

In addition, the transmitter 1320 may transmit uplink scheduling information for a plurality of subbands through one downlink control information.

For example, the downlink control information may include a redundancy version (RV) field for each of the plurality of subbands. Here, the RV field may be set differently between the plurality of subbands. As another example, the downlink control information may include HARQ process ID information for each of the plurality of subbands. Here, the HARQ process ID information may be set to increase by 1 according to the scheduling order based on the first subband scheduled by the uplink scheduling information.

Meanwhile, the downlink control information includes subband indication information indicating one or more subbands that are the target of LBT operation, bandwidth part indication information indicating the bandwidth part including one or more subbands that are the target of LBT operation, and uplink. It may include at least one of frequency domain resource allocation information for link data transmission and time domain resource allocation information for uplink data transmission.

The terminal performs an LBT operation on radio resources allocated to the terminal by uplink scheduling information. That is, the terminal may sense an energy level of a corresponding radio resource and control an operation of comparing the sensed energy level with a preset reference energy level. Alternatively, the terminal may determine a subband to transmit uplink data based on an energy level value for each subband and a subband selection rule measured as a result of performing the LBT operation. Here, the subband selection rule may be indicated by the base station 1300 or may be preset in the terminal. For example, the subband selection rule may be set based on at least one of subband index information, reference signal reception information for each subband, base station indication information, and default subband presence information.

In addition, the controller 1310 controls the overall operation of the base station 1300 according to performing the uplink data reception operation according to the subband classification required to perform the above-described embodiments of the present invention.

In addition, the transmitter 1320 and the receiver 1330 are used to transmit and receive a signal, a message, and data necessary for performing the above-described embodiment.

In the following, an operation in the case where a plurality of BWPs are formed instead of the above-described subbands will be described. The following description may be performed in combination with the operation described with reference to FIGS. 1 to 13 or may be separately applied.

14 is a diagram illustrating an example in which N bandwidth parts are configured in one element carrier according to an embodiment. Referring to FIG. 14, as described above, one NR CC may configure one or more BWPs. However, no description of a plurality of BWP simultaneous activation operations for resource expansion on the frequency axis has been disclosed.

NR-U, which uses unlicensed bands, must also support BWP operation to efficiently use wideband NR CCs. In general, in order to effectively use the unlicensed band, it may be desirable to map one BWP among the BWPs configured in the terminal to one WiFi channel. However, no specific method is disclosed for the BWP operation in the NR-U. In particular, NR-U may not be able to guarantee an appropriate level of QoS due to LBT. In order to overcome this problem, QoS may be improved if a plurality of BWPs are activated and used, but the current NR specification does not support this. In addition, there is a problem in that the power consumption of the terminal increases when using a plurality of BWP activation.

In summary, NR-based access technologies that use unlicensed bands must support BWP operation to efficiently use wideband NR CCs, such as NR-based access technologies that use unlicensed bands. However, no specific technique for BWP operation to support NR based access using unlicensed band is disclosed. In particular, NR-based access using an unlicensed band may not guarantee an adequate level of QoS due to LBT. In order to overcome this problem, QoS can be improved by activating and using a plurality of BWPs. However, in the current NR, only a single BWP has to be used as an active BWP. The present disclosure is to solve this problem and to provide a method and apparatus for efficiently using a plurality of BWP.

The bandwidth part configuration information below is an arbitrary term meaning information necessary for configuring a bandwidth part in the terminal, and is not limited to the corresponding term, and may be described by describing various terms that may indicate the same meaning. Similarly, the activation indication information also means information indicating activation or deactivation for the bandwidth part configured in the terminal, and the term indicating the same meaning is not limited thereto. In addition, the name of each timer is also disclosed as an example, and may be referred to in various terms when the operation performed by the timer is the same.

In NR, BWP technology has been introduced, and if multiple BWPs can be used to transmit and receive data, it is possible to provide better quality of service by extending the channel usage on the frequency axis. However, the current NR supports only one active BWP operation.

As an example, the initial active (activated) DL / UL BWP may be configured at 20 MHz for the 5 GHz band. This can be determined as a value that is approximate and quantized to the number of PRBs. The initial active DL / UL BWP may be configured for 20 MHz for the 6 GHz band.

For example, rather than configuring one 40 MHz BWP to operate in an unlicensed band, configuring two 20 MHz BWPs to operate in an unlicensed band can provide better data transmission by increasing channel access probability. However, the prior art did not support multiple active BWPs. In addition, when the terminal performs LBT and / or data transmission / reception using a plurality of BWPs as an active BWP in one cell, power consumption of the terminal increases. Accordingly, a method of configuring a plurality of BWPs in the terminal and activating the plurality of BWPs, as well as effectively transitioning the state of the corresponding BWPs as LBT execution and / or data transmission and reception do not occur for a specific BWP Required.

Hereinafter, operations of a terminal and a base station for performing the above-described operation will be described with reference to the drawings.

15 is a diagram for describing an operation of a terminal, according to an exemplary embodiment.

Referring to FIG. 15, the terminal controlling the operation of the bandwidth part (BWP) may perform the step of receiving bandwidth part configuration information for configuring a plurality of bandwidth parts in one cell from the base station (S1500). ).

For example, the bandwidth part configuration information may include a parameter for configuring one or more bandwidth parts in the terminal. The bandwidth part may be configured in a unit of frequency range within one CC, and the frequency axis size of each bandwidth part may be the same or different. In addition, the bandwidth part configuration information may include information on each of the downlink and the uplink separately. Alternatively, the bandwidth part configuration information may include downlink or uplink bandwidth part information, and the terminal may identify downlink and uplink bandwidth part information using peered information.

The bandwidth part configuration information may include at least one of the size (ex, PRB number, etc.), number, frequency axis position (ex, PRB index, etc.), and bandwidth part index information of the bandwidth part configured in the terminal. In addition, the bandwidth part configuration information may further include information indicating a default bandwidth part of the bandwidth parts configured in the terminal. The default bandwidth part may be described and described as the initial bandwidth part. In addition, the parameters included in the bandwidth part configuration information may be configured in various ways, and may include information of individual embodiments to be described later.

The terminal may configure a plurality of bandwidth parts in one CC using the bandwidth part configuration information. For example, one bandwidth part (eg, default / initial bandwidth part) of the plurality of bandwidth parts may be configured in an activated state.

In operation S1510, the terminal may receive activation indication information indicating activation of at least two bandwidth parts of the plurality of bandwidth parts.

For example, the activation indication information includes information on which bandwidth part of a plurality of bandwidth parts configured in the terminal is to be activated. To this end, the activation indication information may be configured in the form of a bitmap field indicating whether to activate each of a plurality of bandwidth parts. Alternatively, the activation indication information may be configured in the form of a bandwidth part identification information field for indicating a bandwidth part to be activated.

In addition, the activation indication information may be included in the downlink control information (DCI). Alternatively, the activation indication information may be included in higher layer signaling such as an RRC message. Alternatively, the activation indication information may be included in the MAC CE for more dynamic indication. In addition, the parameters included in the activation indication information may be configured in various ways, and may include information of individual embodiments to be described later.

The terminal may change or maintain the bandwidth part indicated by the activation indication information in the activated state. That is, when a plurality of bandwidth parts are simultaneously indicated by one message in the activation indication information, the terminal may configure the corresponding plurality of bandwidth parts in an activated state.

The terminal may perform a timer control step of starting a deactivate timer for each of two or more bandwidth parts indicated for activation (S1520).

For example, when the UE receives activation indication information on a plurality of bandwidth parts, the terminal configures each of the indicated two or more bandwidth parts in an activated state. When configuring two or more bandwidth parts, respectively, in an active state, the UE starts a deactivation timer associated with each bandwidth part. The deactivation timer may be configured in the terminal in advance, may be configured to different values for each bandwidth part, or may be configured to the same value. When the inactivity timer expires, the bandwidth part transitions to the inactivity state.

Meanwhile, the terminal may differently control the timer operation according to the state of the indicated two or more bandwidth parts. For example, the terminal may control the operation of the inactivity timer of each bandwidth part according to the activation indication information. When the inactivity timer expires, the terminal performs the bandwidth part switching operation on the default (initial) bandwidth part. That is, the inactivity timer is a timer that controls the bandwidth part switching operation of the terminal. Therefore, when a plurality of bandwidth parts are configured in an active state, a control operation for an inactivity timer may also be required.

For example, the terminal may stop the inactivity timer when there is a bandwidth part in which an inactivity timer operates among two or more bandwidth parts indicated by the activation indication information. The bandwidth part indicated by the activation indication may be already activated. In this case, since the inactivity timer is in operation, when the plurality of bandwidth parts are instructed to be activated by the activation state indication information, the inactivity timer of the corresponding bandwidth part may be stopped.

As another example, when there is a bandwidth part in an inactive state among two or more bandwidth parts indicated by the activation indication information, an inactivity timer when the bandwidth part in an inactive state is changed to an active state by the activation indication information You can control not to apply. That is, when the bandwidth part indicated by the activation indication information is configured in an inactive state, the terminal should configure the corresponding bandwidth part in an activated state. In this case, the terminal may not apply the inactivity timer to the bandwidth part transitioned to the activated state.

Through this, in configuring the plurality of bandwidth parts in an active state, the terminal may prevent an operation in which one of the default bandwidth parts transitions a plurality of bandwidth parts as the inactivity timer expires. That is, when the inactivity timer is operated, it is possible to prevent a case where a plurality of bandwidth parts are transitioned to one default bandwidth part and changed to an operation ambiguity or a single activation bandwidth part of the terminal.

Through the terminal operation described above, by activating a plurality of bandwidth parts, the terminal can be used to extend the bandwidth on the frequency axis. In addition, in activating a plurality of bandwidth parts, the timer may be controlled to prevent ambiguity and unintended state transition of the terminal. In addition, in order to prevent unnecessary power consumption of the terminal, the number of active bandwidth parts may be adjusted.

16 is a view for explaining a terminal operation according to another embodiment.

Referring to FIG. 16, if the deactivation timer expires after step S1520, the terminal may further perform a step of changing the bandwidth part associated with the deactivation timer to the deactivation state (S1600). For example, the deactivation timer may be involved in controlling the state transition behavior of the associated bandwidth part.

When the terminal receives activation information indicating activation of the plurality of bandwidth parts, the terminal configures the corresponding bandwidth part in an activation state. At this time, the terminal may start or restart the deactivation timer in association with each bandwidth part.

For example, if the bandwidth part indicated by the activation indication information is already activated and the deactivation timer is in operation, the terminal may restart the deactivation timer associated with the corresponding bandwidth part.

As another example, when the bandwidth part indicated by the activation indication information is in an inactive state, the configuration may be started by applying an inactivity timer while configuring an active state.

The deactivation timer may be pre-configured in the terminal or included in the activation indication information. The value of the deactivation timer may be configured differently for each bandwidth part or may be configured identically.

Through this, the terminal may activate a plurality of bandwidth parts and minimize power consumption that may occur when performing the LBT operation as needed.

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

17 illustrates an operation of a base station according to an embodiment.

Referring to FIG. 17, a base station for controlling the operation of a bandwidth part (BWP) may perform a step of transmitting bandwidth part configuration information for configuring a plurality of bandwidth parts in one cell to a terminal (S1700). ).

For example, the bandwidth part configuration information may include a parameter for configuring one or more bandwidth parts in the terminal. In addition, the bandwidth part configuration information may include information on each of the downlink and the uplink separately. Alternatively, the bandwidth part configuration information may include downlink or uplink bandwidth part information, and the terminal may identify downlink and uplink bandwidth part information using peered information.

The bandwidth part configuration information may include at least one of the size (ex, PRB number, etc.), number, frequency axis position (ex, PRB index, etc.) and bandwidth part index information of the bandwidth part configured in the terminal. In addition, the bandwidth part configuration information may further include information indicating a default bandwidth part of the bandwidth parts configured in the terminal. In addition, the parameters included in the bandwidth part configuration information may be configured in various ways, and may include information of individual embodiments to be described later.

The terminal may configure a plurality of bandwidth parts in one CC using the bandwidth part configuration information. For example, one bandwidth part (eg, default / initial bandwidth part) of the plurality of bandwidth parts may be configured in an activated state.

The base station may perform the step of transmitting activation indication information indicating activation for at least two bandwidth parts of the plurality of bandwidth parts (S1710).

For example, the activation indication information includes information on which bandwidth part of a plurality of bandwidth parts configured in the terminal is to be activated. To this end, the activation indication information may be configured in the form of a bitmap field indicating whether to activate each of a plurality of bandwidth parts. Alternatively, the activation indication information may be configured in the form of a bandwidth part identification information field for indicating a bandwidth part to be activated.

In addition, the activation indication information may be included in the downlink control information (DCI). Alternatively, the activation indication information may be included in higher layer signaling such as an RRC message. Alternatively, the activation indication information may be included in the MAC CE for more dynamic indication. In addition, the parameters included in the activation indication information may be configured in various ways, and may include information of individual embodiments to be described later.

The terminal may change or maintain the bandwidth part indicated by the activation indication information in the activated state. That is, when a plurality of bandwidth parts are simultaneously indicated by one message in the activation indication information, the terminal may configure the corresponding plurality of bandwidth parts in an activated state.

As described above, the terminal may start a deactivate timer for each of two or more bandwidth parts indicated for activation. For example, when the UE receives activation indication information on a plurality of bandwidth parts, the terminal configures each of the indicated two or more bandwidth parts in an activated state. When configuring two or more bandwidth parts, respectively, in an active state, the UE starts a deactivation timer associated with each bandwidth part. The deactivation timer may be configured in the terminal in advance, may be configured to different values for each bandwidth part, or may be configured to the same value.

In addition, the terminal may control the operation of the inactivity timer of each bandwidth part according to the activation indication information. For example, the terminal may stop the inactivity timer when there is a bandwidth part in which an inactivity timer operates among two or more bandwidth parts indicated by the activation indication information. The bandwidth part indicated by the activation indication may be already activated. In this case, since the inactivity timer is in operation, when the plurality of bandwidth parts are instructed to be activated by the activation state indication information, the inactivity timer of the corresponding bandwidth part may be stopped.

As another example, when there is a bandwidth part in an inactive state among two or more bandwidth parts indicated by the activation indication information, an inactivity timer when the bandwidth part in an inactive state is changed to an active state by the activation indication information You can control not to apply. That is, when the bandwidth part indicated by the activation indication information is configured in an inactive state, the terminal should configure the corresponding bandwidth part in an activated state. In this case, the terminal may not apply the inactivity timer to the bandwidth part transitioned to the activated state.

On the other hand, when the terminal receives the activation information indicating the activation of the plurality of bandwidth parts, configures the corresponding bandwidth part in the activated state. At this time, the terminal may start or restart the deactivation timer in association with each bandwidth part.

For example, if the bandwidth part indicated by the activation indication information is already activated and the deactivation timer is in operation, the terminal may restart the deactivation timer associated with the corresponding bandwidth part. As another example, when the bandwidth part indicated by the activation indication information is in an inactive state, the configuration may be started by applying an inactivity timer while configuring an active state. Through this, the terminal may activate a plurality of bandwidth parts and minimize power consumption that may occur when performing the LBT operation as needed.

Hereinafter, various embodiments will be described with respect to each operation performed by the aforementioned terminal and base station. The information indicated by the base station to the terminal described below may be included in the above-mentioned bandwidth part configuration information, activation indication information, and the like. Or it may be delivered through a message separate from the above information. Each of the following embodiments may be performed by the terminal and the base station independently or in any combination.

As described above, the terminal may receive a signal indicating the activation of the plurality of bandwidth parts of the bandwidth parts configured in the terminal from the base station. Hereinafter, a detailed embodiment of the activation instruction information receiving method will be described.

First embodiment: A method of receiving activation indication information through downlink control information (DCI).

One serving cell (or component carrier) may be configured with a plurality of BWPs. For example, the UE may be configured with a plurality of BWPs in one serving cell. The cell (or the BWP) may be included in an unlicensed band. The active BWP for one serving cell may be indicated through RRC or PDCCH. For example, when adding a special cell or activating a SCell, the DL BWP and the UL BWP may be indicated as active BWPs by the "firstActiveDownlinkBWP-Id" and "firstActiveUplinkBWP-Id" information elements included in higher layer signaling. Can be. Alternatively, the active BWP may also be indicated by the PDCCH indicating downlink allocation or uplink grant. If the indicated BWP is activated, the UE performs an operation corresponding to the activated BWP on the indicated BWP.

Meanwhile, in order for a terminal to simultaneously transmit and receive data by activating a plurality of BWPs in one serving cell (for example, RF support for supporting a plurality of BWPs), the terminal capability for indicating that the terminal supports the corresponding function is supported. Should be. Similarly, in order for a UE to perform LBT simultaneously on a plurality of BWPs in one serving cell, UE capability for indicating that the UE supports a corresponding function must be supported. The terminal capability may be supported by 1-bit information or may be supported by 2-bit information for each function (e.g. multiple BWP activation, multiple BWP LBT). The terminal may transmit terminal capability information indicating whether the terminal supports multiple BWPs or whether LBT is supported by the multiple BWPs to the base station through the terminal capability signaling.

The base station may transmit to the terminal activation indication information instructing the terminal to activate a plurality of BWPs in one cell through downlink control information (DCI).

For example, in order to indicate activation of a plurality of downlink BWPs, the base station may include activation indication information in downlink allocation information. As another example, in order to indicate activation of a plurality of uplink BWPs, the base station may include activation indication information for instructing activation of the plurality of uplink BWPs in the uplink allocation information.

Meanwhile, in the case of an unpaired spectrum, the DL BWP is paired with the UL BWP. In addition, the activation instruction for the plurality of BWPs may be commonly applied to the uplink and the downlink.

Or, if the activation indication information for indicating activation for a plurality of BWP in one cell is a DCI Format (eg, DCI format 0_0, 0_1 or PUSCH for providing uplink scheduling for PUSCH in one cell) To provide downlink scheduling for a new DCI Format for providing uplink scheduling for a cell or a DCI Format for providing downlink scheduling for a PDSCH in one cell (eg, DCI format 1_0, 1_1 or PDSCH) If included in the new DCI Format, there is no need to distinguish uplink / downlink for BWPs for which activation is indicated. In contrast, when the activation indication information is included in a DCI format other than uplink scheduling or downlink scheduling, uplink or downlink indication information of BWPs indicated by the corresponding activation indication information may be additionally included.

Information for indicating activation for the plurality of downlink BWPs may be configured as a bitmap for each BWP.

For example, the bitmap for indicating activation may have a number of bits determined by the number of BWPs configured by a higher layer. If the base station configures four dedicated BWPs, the bitmap may consist of four bits. If the base station has three configured BWPs in addition to the initial BWP, the bitmap may consist of three bits except the initial BWP.

For another example, the bitmap for indicating activation may have a bit number determined by adding one to a dedicated BWP number configured by a higher layer. If the base station has three configured BWPs in addition to the initial BWP, the bitmap may consist of four bits. For example, if no initial BWP or Default BWP is configured, even though there are three dedicated BWPs configured by a higher layer, adding a bit for the initial BWP or Default BWP, the bitmap It can consist of 4 bits in total.

Each bit of the bitmap may indicate the status for each BWP-ID in order (from front or back). For convenience of description, if each bit is Bi, the Bi field indicates the activation / deactivation state of the BWP having the BWP-ID i. Where i can start at 0 or start at 1. For example, if the UE has an initial BWP, i may start from zero. For another example, i may start from 1 if the terminal does not have an initial BWP. For another example, i may start from 1 to indicate activation / deactivation for a plurality of BWPs except for the initial BWP.

On the other hand, the base station may release the BWP configured in the middle of the process of configuring a plurality of BWP. For example, BWP-id 1, BWP-id 2, and BWP-id 3 may be configured, and then BWP-id 2 may be released. In this case, when BWP-id 3 is reconfigured to BWP-id 2, the number of bits in the bitmap can be reduced by one to be used for BWP activation / deactivation indication. As another example, if the BWP-ID is not reconfigured, the BWP activation / deactivation indication may be used according to the originally configured maximum BWP-id value, in which case, the UE may ignore the value of the Bi field with the BWP-ID i not configured. have.

As another example, the base station may transmit activation indication information for activating one of the currently deactivated BWPs in addition to the existing activated BWPs without deactivating the existing activated BWPs to the UE through the downlink control information (DCI). . The activation indication information may be provided through a DCI format that is newly defined separately from the existing DCI format. Alternatively, the base station may provide the activation indication information on the downlink control information.

Second Embodiment: Method of Receiving Activation Instruction Information for a plurality of BWPs through an Upper Layer (RRC) Message

One serving cell may be configured with a plurality of BWPs. For example, the UE may be configured with a plurality of BWPs in one serving cell. When the base station configures / reconfigures / adds / modifies a plurality of BWPs in one cell to the terminal through an RRC message, the base station may transmit activation indication information for indicating an activation state for each BWP to the terminal.

18 is a diagram illustrating a bandwidth part information element of an RRC message according to an embodiment.

Referring to FIG. 18, by the RRC message, the BWP is configured uplink and downlink, respectively. Information for indicating the status of the corresponding BWP may be included in the BWP-Uplink information element. Alternatively, information for indicating the status of the corresponding BWP may be included in the BWP-Downlink information element. For example, the information indicating the BWP state may consist of 1 bit. That is, the activation indication information may be configured with 1 bit to indicate an activation state and an inactivation state. Alternatively, the activation indication information may consist of 1 bit to indicate an activation state and a new state. Here, the new state may mean a newly defined state, not an activated state or an inactive state. That is, the new state may refer to a state that is set to operate by combining some of the operation of the activated state and the operation of the deactivated state. The new state is described again later.

When the terminal receives the activation indication information through the RRC message, it configures the activation state for the BWP according to the received information.

For example, if the terminal receiving the RRC reconfiguration message including the above-described BWP configuration information is configured for each BWP configured in the terminal, BWP status indication information (ex, activation indication information through an RRC message) and instructs activation. Configure the BWP as active. Unlike this, BWP status indication information is configured for each BWP configured in the terminal, and if the deactivation state is indicated, the corresponding BWP is configured as an inactive state.

As another example, when receiving the RRC reconfiguration message including the above-described BWP configuration information, the BWP status indication information is configured for each BWP configured in the terminal and configures the corresponding BWP when activated. In contrast, for each BWP configured in the terminal, if the BWP state indication information is configured and indicates a value (for example, a new state) that is not activated, the corresponding BWP is configured as a new state. If the BWP state indication information is not configured or indicates an inactive state, the corresponding BWP is configured to be in an inactive state.

Third embodiment: A method of receiving activation indication information for a plurality of BWPs through a MAC control element.

When the BWP is configured through the upper layer (RRC) signaling, it may be possible to configure the activation state. However, when the UE receives the RRC message, it is necessary to process the PDCP (PDCP processing such as deciphering). Do. Therefore, some delay is caused to perform the BWP activation transition operation in the terminal. In particular, since maintaining a plurality of BWPs causes power consumption, it is desirable to quickly deactivate the BWPs when there is no data transmission. Since signaling for MAC CE does not go through PDCP processing, relatively fast transmission and reception are possible. In addition, when using the MAC CE, it is possible to set the activation or deactivation for each of a plurality of BWP, it is possible to use the efficient radio resources (bits).

In summary, one serving cell may be configured with a plurality of BWPs. For example, a terminal in one serving cell may be configured with a plurality of BWPs. The base station may transmit activation indication information for indicating an activation state for each BWP to a plurality of BWPs configured in one cell to the terminal through the MAC CE.

3-1) Information that may be included in MAC CE when indicating whether to activate BWP through MAC CE

19 and 20 illustrate a field structure of a MAC CE according to an embodiment.

19 and 20, one or more of the following information may be included in configuring the MAC CE format.

Serving Cell ID: When a plurality of serving cells are configured in the terminal, it is necessary to distinguish whether the corresponding MAC CE indicates to which serving cell the BWP is activated. Therefore, the MAC CE needs to include the serving cell ID. This field indicates the identifier of the serving cell to which the MAC CE is applied. The length may be, for example, 5 bits.

UL / DL Classification: A field for distinguishing whether the BWP is for an uplink BWP or a downlink BWP to be activated or deactivated. The length of the corresponding field may be, for example, 1 bit. In the case of an unpaired spectrum, the DL BWP is paired with the UL BWP. Therefore, this field may not be necessary. However, in the case of Pair Spectrum, DL BWP and UL BWP may operate independently or may be pared. Therefore, this field may be necessary. When the unpaired spectrum is instructed to activate or deactivate a plurality of BWPs through a MAC CE for either UL or DL, it can be applied to both uplink and downlink in common.

B0 to B3: For a plurality of configured BWPs, a field for indicating a state (eg, activation / deactivation) of the corresponding BWP may be needed for each BWP (or BWP-ID). The state for each BWP can be represented by 1 bit. The states of each of the plurality of BWPs may be indicated through one bit, and each bit of the plurality of BWPs may be represented by being arranged in a plurality of bitmap / bitsteering. The number of bits may be included as many as the number of bits determined by the number of BWPs configured by a higher layer. If the base station configures four dedicated BWPs, it may consist of four bits. If the base station has three configured BWPs in addition to the initial BWP, it may consist of three bits except the initial BWP. Alternatively, the number of bits may have a number of bits determined by a value obtained by adding one to the number of dedicated BWPs configured by a higher layer. If the base station has three configured BWPs in addition to the initial BWP, this field may consist of four bits. Each bit may indicate a status for each BWP-ID in order (from front or back). For convenience of description, if each bit is Bi, the Bi field indicates the activation / deactivation state of the BWP having the BWP-ID i. Where i can start at 0 or start at 1. For example, if the UE has an initial BWP, i may start from zero. For another example, if the terminal does not have an initial BWP, i may start from 1. For another example, i may start from 1 to allow the UE to indicate activation / deactivation of a plurality of BWPs except for the initial BWP. For another example, the number of bits indicating the status of each BWP may be fixed to the terminal and the base station by the MAC CE. Alternatively, the information indicating the number of bits may be included in the MAC CE or MAC CE having a fixed number of bits through the LCID may be distinguished and used.

-BWP ID: This field may be necessary if you want to include a list of BWPs to be activated or deactivated. This field may indicate an identifier of a BWP to which MAC CE is applied. That is, it includes the BWP-id. The length can have 2 bits if you can configure up to 4 BWPs as it is today. When this field is used, an A / D field indicating the activation / deactivation state for the corresponding BWP ID may be included in succession.

Extension to indicate the presence or absence of additional BWPs: If a list of BWPs to be activated or deactivated is included, and if there are additional BWPs to be activated or deactivated, the corresponding bit is set to 1, otherwise 0. Can be set.

That is, assuming the case of the format of FIG. 20 including a BWP ID field and an extended field, a BWP having a value of BWP ID 1 to instruct activation of a plurality of BWPs corresponding to BWP ID 1 and BWP ID 2 An ID field and an A / D field indicating activation are included, and an extended field (E field) is set to one. The E field is followed by a BWP ID field having a value of BWP ID 2 and an A / D field indicating activation. If only one BWP activation is indicated, the E field is set to zero.

Meanwhile, the aforementioned MAC CE may be identified by the MAC PDU subheader with a new LCID value that is distinct from the LCID used for the existing MAC CEs. At this time, the base station instructs the terminal by specifying a specific value in the LCID value for the DL-SCH. Specific values are determined by predefined values.

For example, the MAC CE for indicating an activation state for a plurality of BWPs in one cell may indicate activation or deactivation for a plurality of BWPs for uplink / downlink through one LCID. As another example, the MAC CE for indicating an activation state for a plurality of BWPs in one cell indicates an activation or deactivation for a plurality of BWPs for uplink through one LCID through two LCIDs, and another The LCID may be configured to indicate activation or deactivation for a plurality of BWPs for the downlink.

In the above description, each embodiment in which activation indication information is transmitted by DCI, RRC, or MAC CE has been described separately, and the operation and detailed parameters in each embodiment have been described in detail.

Hereinafter, a detailed embodiment of the BWP switching operation according to the activation indication will be described.

Processing Method when Receiving BWP Switching Instructions from Multiple Active BWPs

For convenience of explanation, the following situation is assumed.

For a UE, three BWPs (for example, BWP-id 1, BWP-id 2, and BWP-id 3) are configured in one cell, and two BWPs (for example, BWP-id 2 and BWP-id 3) Assume the case of operating as an active BWP. In this case, the base station may switch one active BWP of the plurality of active BWPs with one BWP of the inactive BWPs, or may activate and use one inactive BWP as an active BWP in addition to the existing active BWP.

In order to indicate such an operation, the above-described embodiments may be applied. However, when the above embodiment is applied as it is, there may be a disadvantage in that the number of bits is consumed more than in the conventional method of using DCI. Thus, there is a need to consider some modifications of the above-described embodiments.

In addition, even if a new BWP activation / switching method is introduced by the present embodiment, the existing BWP switching method may continue to be used, and thus, a new BWP that improves an existing BWP switching instruction or an existing BWP switching instruction while a plurality of active BWPs are in operation. There may be a need for a processing method when receiving a switching / activation indication. For example, in the switching method, when the base station wants to switch the BWP to the terminal through the conventional one-to-one BWP switching, when the base station wants to activate the BWP in addition to the terminal by improving the conventional one-to-one BWP switching, the base station and the terminal currently The mismatching of the activated BWP may be applied to various cases, such as when the base station determines that only one BWP is active or a device malfunction.

Hereinafter, various switching operations will be described in detail.

First embodiment: a method of performing a BWP switching operation by deactivating an active BWP having the smallest BWP-ID value

If the bandwidth part indicator field is configured in an existing DCI format (for example, DCI format 0_1 or 1_1) (or the bandwidth part indicator field is configured through a DCI format that improves on the existing DCI format), The bandwidth part indicator field value indicates the active DL / UL BWP from the configured DL / UL BWP set. Therefore, if the bandwidth part indicator field is configured in an existing DCI format (for example, 0_1 or 1_1) or an improved DCI_format, and the field indicates a UL BWP or DL BWP different from the current active UL BWP or DL BWP of the UE, The terminal may change and set the active UL BWP or DL BWP to UL BWP or DL BWP indicated by the bandwidth part indicator field. Alternatively, the terminal may activate the UL BWP or DL BWP indicated by the bandwidth part indicator field.

For example, if the value of the bandwidth part indicator field on the PDCCH indicating downlink allocation or uplink grant is set to a value for inactive BWP-id 1, the UE indicates a BWP-id indicating an active UL BWP or DL BWP. It can be set to 1 UL BWP or DL BWP. Accordingly, the indicated BWP (BWP-id 1) is activated to perform an operation corresponding to the active BWP.

BWP switching may be for switching one inactive BWP with one active BWP. When switching one inactive BWP to an active BWP to save power, it may be desirable to deactivate one active BWP to an inactive BWP. To this end, if there are a plurality of active BWPs, one of the plurality of active BWPs may be deactivated as an inactive BWP.

For example, the BWP having the smallest BWP-id among the active BWPs may be deactivated. That is, three BWPs (for example, BWP-id 1, BWP-id 2, and BWP-id 3) are configured in one cell and two BWPs (for example, BWP-id 2 and BWP-id 3) in one cell. In the case of only active BWP, since BWP-id 2 is smaller than BWP-id 3, the BWP corresponding to BWP-id 2 can be deactivated.

As another example, the BWP of the BWP-id having the BWP-id value representing the largest difference from the BWP-id newly activated among the plurality of active BWP ids may be deactivated.

As another example, the BWP of the BWP-id having the highest channel occupancy or the BWP-id value having the worst measured value among the plurality of active BWP ids may be deactivated.

As another example, the active BWP receiving the PDCCH indicating downlink allocation or uplink grant may be deactivated.

As another example, one of the active BWPs other than the active BWP that receives the PDCCH indicating the downlink allocation or the uplink grant may be deactivated.

As another example, if a timer (for example, a BWP inactivity timer) is running in each of the plurality of active BWPs, the BWP having the least time until expiration may be deactivated for the timer.

As another example, if a random timer (for example, a BWP deactivation timer for deactivating a BWP) is configured and running in each of the plurality of active BWPs, the BWP with the least amount of time until expiration for that timer can be deactivated. have.

Meanwhile, the base station may instruct the terminal through higher layer signaling information for instructing to deactivate one BWP of the plurality of active BWPs as the inactive BWP. Or it may be preconfigured in the terminal. Or it may be implemented so that the terminal operates in this way. Alternatively, this may be included in the DCI and may be indicated to the terminal.

Second Embodiment: If a Default BWP Has Been Configured and Enabled, How to Switch to Deactivate It

If the UE activates inactive BWP-id 1 in the above-described example situation, the base station may indicate the bandwidth part indicator field as a value for BWP-id 1 by the PDCCH indicating downlink allocation or uplink grant. . The UE may set the active UL BWP or DL BWP to the UL BWP or DL BWP of BWP-id 1 indicated by the bandwidth part indicator field in the corresponding DCI format. Accordingly, the corresponding BWP (BWP-id 1) is activated to perform an operation corresponding to the active BWP.

As described above, BWP switching may be for switching one inactive BWP with one active BWP. When switching one inactive BWP to an active BWP to save power, it may be desirable to deactivate one active BWP to an inactive BWP. To this end, if there are a plurality of active BWPs, one of the plurality of active BWPs may be deactivated as an inactive BWP.

As an example, if a default BWP is provided to the UE by a higher layer parameter, and if the corresponding BWP is in an active BWP state, the default BWP may be deactivated.

As another example, if the default BWP is not provided to the terminal by the higher layer parameter, the default BWP may be set as the initial BWP. If the initial BWP is in the active BWP state, the initial BWP may be deactivated.

The base station may indicate information for this, for example, if there are a plurality of active BWPs, information for instructing to deactivate one BWP of the plurality of active BWPs as an inactive BWP to the terminal through higher layer signaling. have. Alternatively, the information may be preconfigured in the terminal. Alternatively, the terminal may be implemented to select the inactive BWP according to the above rules. Alternatively, the corresponding information may be included in the DCI and may be indicated to the terminal.

Third embodiment: a method in which a base station instructs a terminal to deactivate target active BWP information.

As described above, BWP switching may be for switching one inactive BWP with one active BWP. When switching one inactive BWP to an active BWP to reduce power consumption, it may be desirable to deactivate one active BWP as an inactive BWP. To this end, if there are a plurality of active BWPs, one of the plurality of active BWPs may be deactivated as an inactive BWP.

For example, the base station may include deactivation target active BWP information through DCI (or through PDCCH indicating downlink allocation or uplink grant). This information may be configured to have the same format and size as the bandwidth part indicator field. For example, the information indicating the deactivation target active BWP may have 0, 1, or 2 bits as determined by the number of BWPs configured by a higher layer.

As another example, the active BWP receiving the PDCCH including the bandwidth part indicator field may be deactivated. For example, the physical layer may deactivate a DL BWP configured with a corresponding PDCCH resource.

As another example, one of the BWPs that do not receive the PDCCH including the bandwidth part indicator field among the plurality of active BWPs may be deactivated. For the unpaired spectrum, the DL BWP is paired with the UL BWP. Therefore, in this case, BWP switching may also be applied to the uplink. For the paired spectrum, the DL BWP may be applied with BWP switching for each of UL and DL through pairing between UL BWPs.

Fourth Embodiment: Method of Switching to Disable All Active BWPs

When the terminal receives the instruction information for converting the inactive BWP into the active BWP, accordingly, in performing the BWP switching, the terminal may reduce power consumption by switching all the BWPs in the active state to the inactive state.

For example, if there are a plurality of active BWPs, all of the plurality of active BWPs may be deactivated as inactive BWPs.

As another example, if there is a random access procedure in progress in one of the corresponding BWPs associated with the serving cell, the corresponding BWP (or all active BWPs) may be deactivated after the random access is successfully completed.

The base station may indicate information for this, for example, if there are a plurality of active BWPs, information for instructing to deactivate all of the plurality of active BWPs to the terminal through higher layer signaling. Or it may be preconfigured in the terminal. Or, it may be implemented so that the terminal operates in this way. Or, if there are a plurality of active BWPs, the base station can instruct the terminal through the DCI (or PDCCH indicating downlink allocation or uplink grant) information for instructing to deactivate all of the plurality of active BWPs. have. Alternatively, the base station may indicate this by assigning a specific value to a specific information element included in the DCI.

Fifth Embodiment: Method of Maintaining a plurality of Active BWPs in an Active State

As described above, when one or a plurality of active BWPs are configured in the terminal, activation indication information for changing the inactive BWP into the active BWP may be received. Accordingly, the terminal may add an additional BWP as an active BWP. Unlike the above embodiments, the BWP in the active state can be maintained as it is.

For example, if an arbitrary timer is running in the active BWP, the timer may be operated as it is. For example, if the UE does not detect the DCI format for PDSCH reception or PUSCH transmission, the UE increments the timer at every interval of 1 msec for frequency range 1 or at every 0.5 msec interval for frequency range 2. . As another example, if any timer is running in the active BWP, the timer may be started or restarted.

As another example, the indicated BWP may be activated and the remaining active BWP operation may be maintained. That is, it is possible to further activate the indicated BWP without BWP switching. For example, as in the above-described embodiment, three BWPs (for example, BWP-id 1, BWP-id 2, and BWP-id 3) are configured in one cell in a terminal, and two BWPs (for example, BWP-id) are configured. 2, when the BWP-id 3) operates as an active BWP, the bandwidth part indicator field is assigned to the BWP-id 1 by the PDCCH indicating the downlink allocation or uplink grant in order for the base station to activate the inactive BWP-id 1. If it is indicated by the value, the UE may perform the corresponding active BWP operation by additionally activating BWP-id 1 as the active BWP while maintaining BWP-id 2 and BWP-id 3 as the active BWP. As described above, the DCI for this includes a bandwidth part indicator field through an existing DCI format (for example, 0_1 or 1_1) or a DCI format improved from the existing DCI format. It is preconfigured in the corresponding DCI format.

Sixth Embodiment: When a plurality of active BWPs are in operation, when a conventional BWP switching instruction is received, the UE ignores them.

If the terminal indicates the bandwidth part indicator field as a value for the BWP-id 1 by the PDCCH indicating a downlink allocation or uplink grant to activate the inactive BWP-id 1 in the above-described example situation, Can be ignored. And confirmation information about this can be transmitted to the base station. For example, the terminal may transmit confirmation information through UCI and uplink MAC CE signaling. When the terminal transmits through the MAC CE, the terminal may transmit information including the active BWP to the base station.

In the above, various embodiments of transmitting the activation indication information and various embodiments when the activation instruction for the inactive BWP is received when the plurality of BWPs are configured in the active state have been described. In this example, the UE may effectively activate or switch a plurality of active BWPs in one cell.

Hereinafter, various embodiments for preventing power consumption caused by LBT performance (or data transmission / reception) does not occur for a specific BWP when a plurality of BWPs are configured as active BWPs for one cell. That is, an embodiment will be described in a method for effectively transitioning a specific BWP state among a plurality of active BWPs. The embodiments described below and the embodiments described above can be implemented individually or in accordance with optional combinations. In addition, for convenience of description, hereinafter, a plurality of BWP operations operated based on an unlicensed band will be described. However, the same or similar operations may be performed for a plurality of BWP operations operated based on a licensed band.

First embodiment: a timer configuration for deactivating an active BWP for each active BWP

As described above, one serving cell (or component carrier) may be configured with a plurality of BWPs. For example, the UE may be configured with a plurality of BWPs in one serving cell. The cell (or the BWP) may be included in an unlicensed band. The active BWP for one serving cell may be indicated through RRC or PDCCH. When adding a special cell or activating the SCell, DL BWP and UL BWP may be indicated as active BWPs respectively by the "firstActiveDownlinkBWP-Id" and "firstActiveUplinkBWP-Id" information elements included in higher layer signaling. The active BWP may also be indicated by the PDCCH indicating downlink allocation or uplink grant. When the BWP is activated, the operation corresponding to the activated BWP is performed. In order to increase transmission opportunities or increase data transmission capacity, the base station may transition a plurality of BWPs to an active BWP to perform LBT and / or data transmission / retransmission at each BWP or between each BWP. .

In order for a UE to simultaneously transmit and receive data by simultaneously activating a plurality of BWPs in one serving cell, or perform LBT on a plurality of BWPs simultaneously, UE capability for indicating this should be supported. The terminal capability may be supported by 1-bit information or may be supported by 2-bit information for each function (e.g. multiple BWP activation, multiple BWP LBT). The terminal may transmit corresponding terminal capability information to the base station through terminal capability signaling.

As described above, the base station may indicate, to the terminal, activation indication information for instructing activation of a plurality of BWPs in one cell to the terminal through DCI, MAC CE, or RRC signaling. Upon receiving this, the UE may perform LBT and / or data transmission / retransmission by transitioning a plurality of BWPs to an active BWP in one cell.

If LBT performance and / or data transmission / reception do not occur for one or more BWPs among the plurality of active BWPs, deactivation of the corresponding BWP may be considered. To this end, the terminal may configure a deactivation timer for deactivating the active BWP.

For example, the terminal may allow the BWP deactivation timer to operate for each of the plurality of active BWPs. The BWP deactivation timer may be configured for each configured BWP. Specifically, upon receiving the information for instructing the activation of one BWP as the active BWP, the terminal (or MAC entity) is active in the subframe / slot / minislot / symbol / any TTI that has received the activation indication. You can start or restart the BWP deactivation timer for the BWP. Similarly, upon receiving the information for instructing to activate the plurality of BWPs as the active BWP, the terminal (or MAC entity) receives the subframe / slot / minislot / symbol / arbitrarily receiving activation indication information for each BWP. You can start or restart the BWP deactivation timer for each BWP at TTI. The terminal (or MAC entity) may deactivate the BWP associated with the expiration of the BWP deactivation timer.

As another example, if the UE does not detect a DCI format for PDSCH reception or PUSCH transmission, the UE increments the timer value at every interval of 1 msec for frequency range 1 or at every interval of 0.5 msec for frequency range 2 (increment). Let's do it. Through this, it is possible to delay the expiration of the inactivity timer.

As another example, if a C-RNTI or CS-RNTI or a PDCCH addressed to any RNTI indicating downlink allocation or uplink grant is received on the active BWP, the BWP deactivation timer may be started or restarted. Or, if a C-RNTI or CS-RNTI indicating a downlink allocation or uplink grant for the active BWP or a PDCCH addressed to any RNTI is received, the UE may start or restart the BWP deactivation timer. Or, one MAC PDU has been transmitted in the configured uplink grant or received in the configured downlink allocation, and if there is no ongoing random access procedure associated with this serving cell or this PDCCH reception is addressed to the C-RNTI. If the ongoing random access procedure associated with the serving cell is completed successfully, the UE may start or restart the BWP deactivation timer.

Meanwhile, the BWP deactivation timer value is indicated to the terminal as a common parameter through RRC signaling, so that the same value can be applied to each BWP. Alternatively, the BWP deactivation timer value may be indicated to the terminal as each parameter through RRC signaling for each BWP, and different values may be applied to each BWP. Alternatively, if the BWP deactivation timer field / parameter does not exist, the terminal may assume that the BWP deactivation timer value is set to infinity. Alternatively, the BWP Deactivation Timer field may be used to designate any particular value to not apply the timer or set it to infinity.

Second embodiment: A method of controlling the operation of a BWP inactivity timer when a plurality of active BWPs are operated.

In the prior art, the terminal could transmit and receive data through only one active BWP at a time. And BWP switching was to switch one inactive BWP to one active BWP. As a method for BWP switching, a BWP inactivity timer may be used. If the terminal is configured with a BWP inactivity timer, which is a higher layer parameter indicating one timer value, and if the default DL BWP is configured when the BWP inactivity timer associated with the active DL BWP expires, the default DL BWP is configured. It is possible to perform BWP switching with the BWP indicated by, otherwise BWP switching with the initial DL BWP. That is, when the inactivity timer associated with the active BWP expires, the terminal switches the active BWP to the default BWP or the initial BWP. In other words, when the inactivity timer expires, the active BWP transitions to the inactive state, and the default BWP or the initial BWP transitions to the active state.

However, when such an operation is applied when a plurality of active BWPs are operated, a problem may occur in which a plurality of active BWPs are switched to one default BWP or an initial BWP by expiration of an inactivity timer. Or ambiguity may occur in the operation of the terminal. Accordingly, various embodiments of an inactivity timer operation to solve this problem are described below. Each embodiment may be implemented individually or by any combination.

2-1 Embodiment) A method for stopping a BWP inactivity timer when one or more BWPs are indicated as active BWPs.

For convenience of description, three BWPs (for example, BWP-id 1, BWP-id 2, and BWP-id 3) are configured in one cell in a terminal, and two BWPs (for example, BWP-id 2 and BWP- Assume that id 3) operates as an active BWP. According to the above-described inactivity timer operation, when the BWP inactivity timer expires in one of the two active BWPs, the timer should switch the expired active BWP to the default BWP or the initial BWP. After that, if the BWP inactivity timer expires in the other active BWP, it is difficult to apply BWP switching to the corresponding BWP.

For example, if the terminal receives activation indication information for activating a corresponding BWP for one or more BWPs as an active BWP, the terminal stops / ends / stops the BWP inactivity timer operating in the indicated BWP. You can release / delete it.

As another example, if a BWP inactivity timer is configured and the terminal transmits and receives data through one active BWP (or when the terminal activates only one BWP as an active BWP and performs an activated BWP operation), the terminal When receiving the indication information for activating by adding to the active BWP for the one or more BWP, the terminal to stop / terminate / release / delete the BWP inactivity timer associated with the BWP sending and receiving data in the active state as the active BWP can do.

In both cases, the ambiguity can be removed by stopping the inactivity timer of the BWP associated with each of the added active BWP and the existing active BWP.

2-2 Embodiment) When one or more BWPs are indicated as active BWPs, the method does not apply the BWP Inactivity Timer.

For example, if the UE receives activation indication information for activating a corresponding BWP for one or more BWPs as an active BWP, the UE may not apply the BWP inactivity timer to the indicated BWP. Through this, even if the BWP inactivity timer is configured in the terminal, when the plurality of active BWPs are activated to perform the activated BWP operation, the BWP switching operation may not occur.

Example 2-3 A method for starting a BWP inactivity timer when only one BWP remains an active BWP.

The base station may deactivate one of the two active BWPs in consideration of a wireless environment, so that the terminal may transmit and receive data through only one active BWP. Alternatively, the UE may deactivate one BWP of two active BWPs by itself and perform an activated BWP operation by using only one BWP as an active BWP.

In this case, the terminal may start or restart the BWP inactivity timer for the one active BWP. In other words, when a plurality of BWPs are activated and only one BWP is changed to an active state, the terminal starts or restarts an inactivity timer for one BWP in an active state. Through this, the terminal performs the switching operation according to the BWP inactivity timer for one active BWP remaining in the active state. For example, if the UE is configured with a BWP Inactivity Timer, a higher layer parameter indicating a timer value, and if the BWP Inactivity Timer associated with the active DL BWP expires, if the default downlink BWP is configured The UE performs BWP switching to the BWP indicated by the default downlink BWP, and otherwise performs BWP switching to the initial downlink BWP.

Example 2-4) A method of maintaining a running BWP inactivity timer and not applying a BWP inactivity timer to the remaining active BWPs.

If the BWP Inactivity Timer is configured in the UE, when one BWP receives a switching indication in an active state (for example, receiving higher layer signaling or PDCCH) or receives a PDCCH indicating an associated uplink grant or downlink allocation. When receiving, the terminal starts or restarts the BWP Inactivity Timer associated with the corresponding BWP. Subsequently, when an active BWP is activated in addition to one active BWP that is in an active state, the BWP inactivity timer may not be applied to the active BWP that is additionally activated.

An example thereof will be described.

If the BWP inactivity timer is configured, and the default downlink BWP is configured and the active downlink BWP is not the BWP indicated by the default downlink BWP, the terminal (MAC entity) starts or restarts the BWP inactivity timer. can do. Or, if the default downlink BWP is not configured and the active downlink BWP is not the BWP indicated by the initial downlink BWP, the terminal (MAC entity) may start or restart the BWP inactivity timer. If the C-RNTI or CS-RNTI or PDCCH addressed to any RNTI indicating downlink allocation or uplink grant is received on the active BWP, the UE (MAC entity) may start or restart the BWP inactivity timer. have. Or, if a C-RNTI or CS-RNTI indicating a downlink allocation or uplink grant for the active BWP or a PDCCH addressed to any RNTI is received, the UE (MAC entity) starts or initiates a BWP inactivity timer. You can restart it. Or if one MAC PDU has been transmitted in the configured uplink grant or received in the configured downlink assignment, and there is no ongoing random access procedure associated with this serving cell or this PDCCH reception in the C-RNTI addressed this serving. If the ongoing random access procedure associated with the cell is completed successfully, the terminal (MAC entity) may start or restart the BWP inactivity timer. Or, if the PDCCH for BWP switching is received on the active DL BWP, and the MAC entity switches the active BWP, the terminal (MAC entity) may start or restart the BWP inactivity timer.

As such, when an inactivity timer is started or restarted in one active BWP, the inactivity timer associated with the BWP additionally indicated as active is not applied.

For example, if one or more BWPs are activated as an active BWP in addition to one active BWP, the BWP inactivity timer does not operate or apply to the active BWPs that are additionally activated. However, a BWP inactivity timer running on one active BWP that is previously operating as an active BWP may maintain the operation. For example, if the UE does not detect a DCI format for PDSCH reception or PUSCH transmission, the UE increases the BWP inactivity timer at every interval of 1 msec for frequency range 1 or at every interval of 0.5 msec for frequency range 2. (increment) In addition, the UE may apply the inactivity timer start or restart operation described above to the BWP in which the operation of the inactivity timer is maintained.

Through this, if the UE is configured with the BWP inactivity timer, which is a higher layer parameter indicating one timer value, and if the BWP inactivity timer associated with the active DL BWP in which the timer is maintained expires, the default value If the downlink BWP is configured, the terminal performs BWP switching with the BWP indicated by the default downlink BWP, and otherwise performs the BWP switching operation with the initial downlink BWP.

Third embodiment: The deactivation timer is not applied to the default / initial BWP even when activated as the active BWP.

When the default BWP or the initial BWP is included among the plurality of active BWPs, the deactivation timer may not be applied to the default BWP or the initial BWP.

For example, if the BWP deactivation timer is configured in the terminal and one of the plurality of active BWPs is the default BWP or the initial BWP (or the initial BWP when the default BWP is not configured), the default BWP or the initial BWP will be described above. The inactivity timer may not be applied. This prevents the default BWP or the initial BWP from being deactivated by the timer.

In another example, if the BWP deactivation timer is configured in the UE and only one active BWP is configured, the deactivation timer described above is not applied if the active BWP is the default BWP or the initial BWP (or the initial BWP if the default BWP is not configured). Do not. This prevents the corresponding default BWP or initial BWP from being deactivated by the timer.

Through the above-described operation, when a plurality of active BWPs are configured in the terminal, the terminal power consumption can be reduced by effectively deactivating the active BWP according to the timer of the terminal without explicit signaling. Hereinafter, a configuration of a terminal and a base station capable of performing the above-described embodiment will be described with reference to the drawings.

21 is a diagram illustrating an example of a terminal configuration.

Referring to FIG. 21, the terminal 2100 controlling the operation of a bandwidth part (BWP) receives bandwidth part configuration information for configuring a plurality of bandwidth parts in one cell from a base station, and receives a plurality of bandwidths. A receiving unit 2130 for receiving activation indication information indicating activation of at least two or more bandwidth parts among the parts, and a controller 2110 for starting a deactivate timer for each of the two or more bandwidth parts indicated for activation. .

For example, the bandwidth part configuration information may include information on downlink and uplink, respectively. Alternatively, the bandwidth part configuration information may include downlink or uplink bandwidth part information, and the terminal may identify downlink and uplink bandwidth part information using peered information. The bandwidth part configuration information may include at least one of the size (ex, PRB number, etc.), number, frequency axis position (ex, PRB index, etc.) and bandwidth part index information of the bandwidth part configured in the terminal. In addition, the bandwidth part configuration information may further include information indicating a default bandwidth part of the bandwidth parts configured in the terminal.

In addition, the activation indication information includes information on which bandwidth part of the plurality of bandwidth parts configured in the terminal 2100 is activated. To this end, the activation indication information may be configured in the form of a bitmap field indicating whether to activate each of a plurality of bandwidth parts. Alternatively, the activation indication information may be configured in the form of a bandwidth part identification information field for indicating a bandwidth part to be activated. In addition, the receiver 2130 may receive activation indication information through downlink control information (DCI) or higher layer signaling such as an RRC message or MAC CE.

The controller 2110 may change or maintain the bandwidth part indicated by the activation indication information in the activated state. That is, when a plurality of bandwidth parts are simultaneously indicated by one message in the activation indication information, the controller 2110 may configure the corresponding plurality of bandwidth parts in an activated state.

When the activation instruction information for the plurality of bandwidth parts is received, the controller 2110 configures each of the indicated two or more bandwidth parts in an activation state. When configuring two or more bandwidth parts, respectively, in an active state, the UE starts a deactivation timer associated with each bandwidth part. When the inactivity timer expires, the bandwidth part transitions to the inactivity state.

Meanwhile, the controller 2110 may differently control the timer operation according to the states of the two or more bandwidth parts indicated. For example, the terminal may control the operation of the inactivity timer of each bandwidth part according to the activation indication information.

For example, the controller 2110 may stop the inactivity timer when there is a bandwidth part in which an inactivity timer operates among two or more bandwidth parts indicated by the activation indication information. As another example, when there is a bandwidth part in an inactive state among two or more bandwidth parts indicated by the activation indication information, the controller 2110 changes the inactive bandwidth part to the activated state by the activation indication information. Inactivity) You can control not to apply the timer.

When the deactivation timer expires, the controller 2110 may change the bandwidth part associated with the deactivation timer to the deactivation state. For example, if the bandwidth part indicated by the activation indication information is already activated and the deactivation timer is in operation, the controller 2110 may restart the deactivation timer associated with the corresponding bandwidth part. As another example, when the bandwidth part indicated by the activation indication information is in the deactivated state, the controller 2110 may start by applying the deactivation timer while configuring the activated state.

In addition, the controller 2110 configures a plurality of BWPs necessary to perform the above-described embodiments, and controls the overall operation of the terminal 2100 according to controlling the operation thereof. In addition, the transmitter 2120 and the receiver 2130 are used to transmit and receive signals, messages, and data necessary for performing the above-described embodiment with the base station.

22 is a diagram illustrating a configuration of a base station according to an embodiment.

Referring to FIG. 22, the base station 2200 that controls the operation of the bandwidth part (BWP) transmits bandwidth part configuration information for configuring a plurality of bandwidth parts to one cell, and transmits a plurality of bandwidths. And a transmitter 2220 for transmitting activation indication information indicating activation of at least two bandwidth parts among the parts, and a controller 2210 for generating configuration information and activation indication information. The terminal starts a deactivate timer for each of two or more bandwidth parts indicated for activation.

As described above, the bandwidth part configuration information may include a parameter for configuring one or more bandwidth parts in the terminal. The bandwidth part configuration information may include at least one of the size (ex, PRB number, etc.), number, frequency axis position (ex, PRB index, etc.) and bandwidth part index information of the bandwidth part configured in the terminal. In addition, the bandwidth part configuration information may further include information indicating a default bandwidth part of the bandwidth parts configured in the terminal.

Meanwhile, the activation indication information includes information on which bandwidth part of a plurality of bandwidth parts configured in the terminal is to be activated. To this end, the activation indication information may be configured in the form of a bitmap field indicating whether to activate each of a plurality of bandwidth parts. Alternatively, the activation indication information may be configured in the form of a bandwidth part identification information field for indicating a bandwidth part to be activated. In addition, the transmitter 2220 may include the activation indication information in downlink control information (DCI) or higher layer signaling or MAC CE.

The controller 2210 may generate bandwidth part configuration information, activation indication information, and the like transmitted to the terminal. In addition, the controller 2210 may control operations of the transmitter 2220 and the receiver 2230.

In addition, the controller 2210 configures a plurality of BWPs necessary to perform the above-described embodiments of the present invention, and controls the overall operation of the base station 2200 according to controlling the operation of the terminal.

In addition, the transmitter 2220 and the receiver 2230 are used to transmit and receive signals, messages, and data necessary for performing the above-described embodiment.

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

In particular, the embodiments described in this disclosure can include the content of information elements and operations specified in TS 38.321, TS 38.213, TS 38.331, and TS 38.214. The terminal operation related to the definition of the above-described information elements may also be applied to the contents specified in the standard.

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

In the case of a hardware implementation, the method according to the 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), a processor, a controller, a microcontroller or a microprocessor may be implemented.

In the case of an implementation by firmware or software, the method according to the embodiments may be implemented in the form of an apparatus, procedure, or function for performing the functions or operations described above. The software code may be stored in a memory unit and driven by a processor. The memory unit may be located inside or outside the processor, and may exchange data with the processor by various known means.

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

The above description is merely illustrative of the technical idea of the present disclosure, and various modifications and variations may be made by those skilled in the art without departing from the essential characteristics of the present disclosure. In addition, the present embodiments are not intended to limit the technical spirit of the present disclosure but to describe the scope of the present inventive concept. The protection scope of the present disclosure should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto shall be interpreted as being included in the scope of the present disclosure.

CROSS-REFERENCE TO RELATED APPLICATION

This patent application is filed with Korea Patent Application No. 10-2018-0078768 filed in Korea on July 06, 2018 and Patent Application No. 10-2018-0082569 filed for Korea on July 16, 2018 and July 2018 Patent application No. 10-2018-0084712 filed with Korea on 20th and patent application No. 10-2019-0079202 filed with Korea on July 02, 2019 and patent application filed with Korea on July 03, 2019 No. 10-2019-0079857 claims priority pursuant to United States Patent Act Section 119 (a) (35 USC § 119 (a)), all of which is incorporated herein by reference. In addition, if this patent application claims priority for the same reason for countries other than the United States, all its contents are incorporated into this patent application by reference.

Claims (18)

In the method for the terminal to transmit the uplink data in the unlicensed band, Receiving a plurality of subband configuration information for a bandwidth part configured in an unlicensed band from a base station; Receiving downlink control information including uplink scheduling information for a plurality of the subbands; Determining a subband for transmitting uplink data based on a result of performing an LBT operation on each of the one or more subbands based on the uplink scheduling information; And Transmitting the uplink data in at least one subband determined within the bandwidth part. The method of claim 1, The subband configuration information, At least one of the number of the subbands, the bandwidth of the subbands, the size of the subbands and the number of PRBs of the subbands, and the bandwidth part identification information mapped to each subband in each bandwidth part. How to include. The method of claim 1, The downlink control information, A redundancy version (RV) field for each of the plurality of subbands, The RV field is set differently between the plurality of subbands. The method of claim 1, The downlink control information, HARQ process ID information for each of the plurality of subbands, The HARQ process ID information, And increase by 1 according to a scheduling order based on the first subband scheduled by the uplink scheduling information. The method of claim 1, The downlink control information, Subband indication information indicating the one or more subbands targeted for the LBT operation, bandwidth part indication information indicating the bandwidth part including the one or more subbands targeted for the LBT operation, and the uplink data And at least one of frequency domain resource allocation information for transmission and time domain resource allocation information for the uplink data transmission. The method of claim 1, Determining the subbands, Determining based on the energy level value of each subband and the subband selection rule measured as a result of performing the LBT operation, The subband selection rule, And at least one of subband index information, reference signal reception information for each subband, base station indication information, and default subband presence information. In the base station to receive uplink data in the unlicensed band, Transmitting a plurality of subband configuration information for a bandwidth part configured in an unlicensed band to a terminal; Transmitting downlink control information including uplink scheduling information for a plurality of the subbands; And Receiving, in the bandwidth part, uplink data in at least one subband determined based on a result of the LBT operation performed by the terminal for each of the one or more subbands. The method of claim 7, wherein The subband configuration information, At least one piece of information of the number of the subbands, the bandwidth of the subbands, the size of the subbands and the number of PRBs of the subbands, and the bandwidth part identification information mapped to each subband in each bandwidth part. How to include. The method of claim 7, wherein The downlink control information, A redundancy version (RV) field for each of the plurality of subbands, The RV field is set differently between the plurality of subbands. The method of claim 7, wherein The downlink control information, HARQ process ID information for each of the plurality of subbands, The HARQ process ID information, And increase by 1 according to a scheduling order based on the first subband scheduled by the uplink scheduling information. The method of claim 7, wherein The downlink control information, Subband indication information indicating the one or more subbands targeted for the LBT operation, bandwidth part indication information indicating the bandwidth part including the one or more subbands targeted for the LBT operation, and the uplink data And at least one of frequency domain resource allocation information for transmission and time domain resource allocation information for the uplink data transmission. The method of claim 7, wherein The terminal, Determining the subband for the uplink data transmission based on an energy level value of each subband and a subband selection rule measured as a result of performing the LBT operation, The subband selection rule, And at least one of subband index information, reference signal reception information for each subband, base station indication information, and default subband presence information. In a terminal for transmitting uplink data in an unlicensed band, Receive a plurality of subband configuration information for the bandwidth part configured in the unlicensed band from the base station, A receiver configured to receive downlink control information including uplink scheduling information for a plurality of the subbands; A controller configured to determine a subband for transmitting uplink data based on a result of performing an LBT operation on each of the one or more subbands based on the uplink scheduling information; And And a transmitter for transmitting the uplink data in at least one subband determined within the bandwidth part. The method of claim 13, The subband configuration information, At least one of the number of the subbands, the bandwidth of the subbands, the size of the subbands and the number of PRBs of the subbands, and the bandwidth part identification information mapped to each subband in each bandwidth part. Including a terminal. The method of claim 13, The downlink control information, A redundancy version (RV) field for each of the plurality of subbands, The RV field is configured to be set differently between the plurality of subbands. The method of claim 13, The downlink control information, HARQ process ID information for each of the plurality of subbands, The HARQ process ID information, And a terminal configured to increase by 1 according to a scheduling order based on the first subband scheduled by the uplink scheduling information. The method of claim 13, The downlink control information, Subband indication information indicating the one or more subbands targeted for the LBT operation, bandwidth part indication information indicating the bandwidth part including the one or more subbands targeted for the LBT operation, and the uplink data And at least one of frequency domain resource allocation information for transmission and time domain resource allocation information for the uplink data transmission. The method of claim 13, The control unit, And determining the subband for the uplink data transmission based on an energy level value of each subband and a subband selection rule measured as a result of performing the LBT operation.

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