KR20200013609A - Method and apparatus for transmitting and receiving uplink control information in unlicensed band - Google Patents

Abstract

The present invention relates to a method and an apparatus which allow a terminal to transmit uplink control information in an unlicensed band. According to an embodiment of the present invention, the method comprises: a step of receiving first wireless resource information for at least one subband allocated to transmission of a physical uplink shared channel (PUSCH) among a plurality of subbands for a bandwidth part constructed in an unlicensed band; a step of receiving second wireless resource information allocated to transmission of uplink control information (UCI); a step of multiplexing the uplink control information to the physical uplink shared channel if second wireless resources allocated to transmission of the uplink control information are indicated in the same slot as first wireless resources allocated to transmission of the physical uplink shared channel; and a step of transmitting the physical uplink shared channel to which the uplink control information is multiplexed.

Description

Method and apparatus for transmitting and receiving uplink control information in unlicensed band {METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING UPLINK CONTROL INFORMATION IN UNLICENSED BAND}

The present embodiments propose a method and apparatus for transmitting and receiving uplink control information in an unlicensed band in a next generation wireless access network (hereinafter referred to as "NR").

3GPP recently approved a study item "Study on New Radio Access Technology" for the study of next-generation radio access technology (that is, 5G radio access technology). Designs for frame structures, channel coding & modulation, waveforms and multiple access schemes are in progress. The NR is required to be designed to satisfy various QoS requirements required for each detailed and detailed usage scenario as well as improved data rate compared to LTE.

As representative usage scenarios of NR, enhancement mobile broadband (eMBB), massive machine type communication (MMTC), and ultra reliable and low latency communications (URLLC) are defined, and flexible frame structure compared to LTE to satisfy the needs of each usage scenario. Design is required.

Each service scenario has different requirements for data rates, latency, reliability, coverage, and so on, through the frequency bands that make up any NR system. As a method for efficiently satisfying the needs of each usage scenario, based on different numerology (for example, subcarrier spacing, subframe, transmission time interval, etc.) There is a need for a method of efficiently multiplexing radio resource units of a network.

As part of this aspect, there is a need for a design for transmitting uplink control information using an unlicensed band in the NR.

Embodiments of the present disclosure may provide a piggyback method and apparatus capable of transmitting and receiving multiplexing uplink control information on an uplink data channel (PUSCH) in an unlicensed band.

In addition, embodiments of the present disclosure may provide a specific method and apparatus capable of allocating resources for an uplink control channel (PUCCH) in an unlicensed band.

In one aspect, the embodiments of the present invention provide a method for a user equipment to transmit uplink control information in an unlicensed band, from among a plurality of subbands for a bandwidth part configured in an unlicensed band, a physical uplink shared channel (PUSCH) Receiving first radio resource information for at least one subband allocated to the transmission of the Tx, receiving second radio resource information allocated to the transmission of the uplink control information (UCI), and uplink Multiplexing uplink control information on the uplink data channel when the second radio resource allocated for transmission of the link control information is indicated in the same slot as the first radio resource allocated for the transmission of the uplink data channel And transmitting an uplink data channel multiplexed with uplink control information.

In another aspect, the embodiments of the present invention provide a method for a base station to receive uplink control information in an unlicensed band, and includes a physical uplink shared channel (PUSCH) among a plurality of subbands for a bandwidth part configured in the unlicensed band. Transmitting first radio resource information for at least one subband allocated to the transmission of the Tx, transmitting second radio resource information allocated to the transmission of uplink control information (UCI) and uplink. When the second radio resource allocated to the transmission of the link control information is indicated in the same slot as the first radio resource allocated to the transmission of the uplink data channel, receiving the uplink data channel multiplexed with the uplink control information. It can provide a method to include.

In another aspect, the present embodiment, in the terminal for transmitting uplink control information in the unlicensed band, of the plurality of subbands for the bandwidth part configured in the unlicensed band, a physical uplink shared channel (PUSCH) Receiving unit for receiving first radio resource information for at least one subband allocated to the transmission of, and receiving the second radio resource information allocated for transmission of uplink control information (UCI), uplink control A control unit for multiplexing uplink control information into the uplink data channel when the second radio resource allocated to the transmission of the information is indicated in the same slot as the first radio resource allocated to the transmission of the uplink data channel; A terminal including a transmitter for transmitting an uplink data channel multiplexed with link control information may be provided.

In another aspect, the present embodiment is a base station for receiving uplink control information in an unlicensed band, among the plurality of subbands for the bandwidth part configured in the unlicensed band, a physical uplink shared channel (PUSCH) Transmitter and uplink control for transmitting the first radio resource information for at least one subband allocated to the transmission of the transmission, and for transmitting the second radio resource information allocated for transmission of the uplink control information (UCI) If the second radio resource allocated to the transmission of the information is indicated in the same slot as the first radio resource allocated to the transmission of the uplink data channel, the uplink control information includes a receiving unit for receiving the multiplexed uplink data channel A base station can be provided.

According to the present embodiments, it is possible to provide a piggyback method and apparatus for transmitting and receiving multiplexing uplink control information on an uplink data channel (PUSCH) in an unlicensed band.

In addition, according to the present embodiments, it is possible to provide a specific method and apparatus for allocating resources for an uplink control channel (PUCCH) in an unlicensed band.

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 an embodiment of the present invention can be applied.
4 is a diagram for describing a bandwidth part supported by a radio access technology to which the present embodiment can be applied.
FIG. 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 explaining CORESET.
FIG. 8 is a diagram illustrating an example of symbol level alignment among different SCSs in different SCSs to which the present embodiment can be applied.
FIG. 9 is a diagram illustrating a conceptual example of a bandwidth part to which the present embodiment can be applied.
FIG. 10 is a diagram illustrating a procedure for transmitting uplink control information in an unlicensed band by a terminal according to an embodiment.
11 is a diagram illustrating a procedure of receiving uplink control information in an unlicensed band by a base station according to an embodiment.
12 illustrates an example of performing LBT for wireless communication in an unlicensed band according to an embodiment.
FIG. 13 is a diagram for describing a subband constituting a bandwidth part configured in a terminal according to an embodiment.
14 and 16 illustrate a configuration of a PUCCH opportunity set according to an embodiment.
17 is a diagram illustrating a configuration of a user terminal according to another embodiment.
18 is a diagram illustrating a configuration of a base station according to another embodiment.

Hereinafter, some embodiments of the present disclosure will be described in detail with reference to exemplary drawings. In adding reference numerals to components of each drawing, the same components may have the same reference numerals as much as possible even though they are 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, but it should be understood 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 relationship between the temporal relationship of " after, ", " after, " 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, when numerical values or corresponding information (e.g., levels) for the component are mentioned, the numerical values or 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 in the present specification means 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, the 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 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 in a radio technology 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.

Meanwhile, the terminal in the present specification is a comprehensive concept of a device including a wireless communication module for performing communication with a base station in a wireless communication system, and in WCDMA, LTE, NR, HSPA, and IMT-2020 (5G or New Radio), etc. In addition to the user equipment (UE), as well as MS (Mobile Station), User Interface (UT), Subscriber Station (SS), a 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 in the V2X communication system, it may mean a vehicle, a device including a wireless communication module in the vehicle, and the like. In addition, in the case of a machine type communication 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, point (for example, transmission point, reception point, transmission / 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-described 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 radio area, or 2) the radio area itself. In 1) all devices that provide a given wireless area are controlled by the same entity or interact with each other to cooperatively configure the wireless 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 the viewpoint of the user terminal or the position of a neighboring base station.

In the present specification, a cell refers to a component carrier having 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 control channels 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. Configure the same data channel to send and receive data. Hereinafter, a situation in which a signal is transmitted and received through a channel such as a PUCCH, a PUSCH, a PDCCH, and a PDSCH may be described in the form of 'sending and receiving a PUCCH, a PUSCH, a PDCCH, and a PDSCH.'

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 service, they have an eMBB (Enhanced Mobile Broadband) scenario and a 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 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 briefly showing 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 that provide 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) for controlling a control plane such as a terminal access and mobility control function, and a user plane function (UPF) for controlling a 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 that provides NR user plane and control plane protocol termination to the terminal, and ng-eNB means a base station that provides 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 separately.

NR Waveforms, Numelar and Frame Structures

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 of 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 LTE subcarrier spacing, which is one of the 4G communication technologies, fixed at 15 kHz. Specifically, the subcarrier intervals used for data transmission in NR are 15, 30, 60, and 120 kHz, and the subcarrier intervals used for synchronization signal transmission are 15, 30, 12, and 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 is defined. One frame may be divided into half frames of 5 ms, and each half frame includes five subframes. In the case of a 15 kHz subcarrier interval, one subframe consists of one slot and each slot consists of 14 OFDM symbols. 2 is a 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 according to the subcarrier spacing. For example, in the case of a numerology having a 15 kHz subcarrier spacing, the slot is configured to have a length equal to a subframe with a length of 1 ms. On the contrary, in the case of a numerology having a 30 kHz subcarrier interval, the slot is composed of 14 OFDM symbols, but two slots may be included in one subframe with a length of 0.5 ms. That is, the subframe and the frame are defined 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 inversely, thus 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 in a transmission slot is defined, and this slot structure is 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, the 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 the 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 so 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 on which a symbol on one antenna port is carried can be deduced from the channel on which the symbol on another antenna port is carried, 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 an embodiment of the present invention 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 neuralology. In addition, the resource grid may exist according to antenna ports, subcarrier spacing, and transmission direction.

The resource block consists of 12 subcarriers and is defined only in the frequency domain. In addition, a resource element is composed of one OFDM symbol and one subcarrier. Accordingly, as 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.

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

In NR, unlike LTE, which has a fixed carrier bandwidth of 20 MHz, the maximum carrier bandwidth is set from 50 MHz to 400 MHz per subcarrier interval. Therefore, it is not assumed that all terminals use all of these carrier bandwidths. Accordingly, in the NR, as shown in FIG. 4, the UE designates a bandwidth part (BWP) within the carrier bandwidth. 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, for 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, acquires a physical layer cell ID, and obtains 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 time and frequency domain and receives the SSB.

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

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

On the other hand, the SSB is not transmitted at the center frequency of the carrier bandwidth, unlike the SS of the conventional LTE. That is, the SSB may be transmitted 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 location 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 the cell. SIB1 includes information necessary for the UE to perform an initial random access procedure and is periodically transmitted through the PDSCH. In order to receive the SIB1, the UE needs to receive the information on 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 obtains SIB1 on PDSCH according to the scheduling information. The remaining SIBs except for SIB1 may be periodically transmitted or may be transmitted at the request of the UE.

FIG. 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), an 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 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 introduced the concept of CORESET in order to secure the flexibility of the system. 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. The QCL (Quasi CoLocation) assumption for each CORESET has been set, which is used to inform the analog beam direction in addition to the delay spread, Doppler spread, Doppler shift, and average delay, which are assumed by conventional QCL.

7 is a diagram for explaining CORESET.

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

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

In this specification, a 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). May be interpreted as meaning used in the past or present, or various meanings used in the future.

NR (New Radio)

Recently, the NR of 3GPP has been designed to satisfy various QoS requirements required by detailed and detailed service scenarios as well as improved data rate compared to LTE. In particular, as NR's typical service scenarios, enhancement Mobile BroadBand (eMBB), massive machine type communication (MMTC), and Ultra Reliable and Low Latency Communications (URLLC) are defined, and the requirements for each service scenario are defined. As a method for satisfying, there is a demand for a flexible frame structure design compared to LTE.

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

As a method for this, TDM, FDM or TDM / FDM based on one or a plurality of NR component carriers (s) for numerology having different subcarrier spacing values. As a method of supporting multiplexing and a scheduling unit in a time domain, a method of supporting one or more time units has been discussed. In this regard, in NR, a subframe is defined as a kind of time domain structure, and reference numerology is used to define a subframe duration. As the LTE, it was decided to define a single subframe duration consisting of 14 OFDM symbols of the same 15kHz sub-carrier spacing (SCS) -based normal CP overhead. Accordingly, the subframe in NR has a time duration of 1 ms. However, unlike LTE, subframes of NR are absolute reference time durations, and slots and mini-slots are time units based on actual uplink / downlink data scheduling. ) Can be defined. In this case, the number of OFDM symbols and the y value of the corresponding slot are determined to have a value of y = 14 regardless of the SCS value in the case of normal CP.

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

In addition, a short slot time-domain scheduling interval for transmitting / receiving uplink / downlink data is defined based on a mini-slot consisting of fewer symbols than the slot in an arbitrary number (numerology) (or SCS). A scheduling interval may be set or a long time-domain scheduling interval for transmitting / receiving uplink / downlink data may be configured through slot aggregation.

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

Alternatively, as described above, by supporting multiplexing by using the TDM and / or FDM method, a number of numerology having different SCS values in one NR carrier is supported for each numerology. Scheduling data according to a latency requirement based on a defined slot (or mini slot) length is also considered. For example, as shown in FIG. 8 below, when the SCS is 60 kHz, since the symbol length is reduced by about 1/4 compared to the case of the SCS 15 kHz, when one slot is formed of the same 14 OFDM symbols, The slot length is 1ms, while the 60kHz-based slot length is reduced to about 0.25ms.

As described above, in NR, a method of satisfying the requirements of URLLC and eMBB by defining different SCSs or different TTI lengths is being discussed.

PDCCH

In NR and LTE / LTE-A systems, L1 control information such as DL assignment Downlink Control Information (DCI) and UL Grant DCI is transmitted and received through a PDCCH. A control channel element (CCE) is defined as a resource unit for the transmission of the PDCCH, and in the NR, a control resource set (CORESET), which is a frequency / time resource for the PDCCH transmission, may be set for each terminal. In addition, each CORESET may be configured with one or more search spaces consisting of one or more PDCCH candidates for monitoring the PDCCH.

Wider bandwidth operations

In the existing LTE system, a scalable bandwidth operation for any LTE 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 bandwidth of 1.4 MHz to 20 MHz could be configured, the normal LTE terminal is one LTE For the CC, a transmit / receive capacity of 20 MHz bandwidth was supported.

However, in the case of NR, the design is made to support NR terminals having different transmit / receive bandwidth capabilities through one wideband NR CC. Likewise, by configuring one or more bandwidth parts (BWP, bandwidth part (s)) composed of bandwidths subdivided for an arbitrary NR CC, flexible (BWP) configuration through different bandwidth part configuration and activation for each UE. It is required to support flexible bandwidth operation (wider bandwidth operation).

In more detail, in NR, one or more bandwidth parts may be configured through one serving cell configured from a UE perspective, and the corresponding UE may include one downlink bandwidth part in a corresponding serving cell. DL bandwidth part and one uplink bandwidth part (UL bandwidth part) by activation (activation) has been defined to be used for transmitting and receiving uplink / downlink data. In addition, when a plurality of serving cells are configured in the corresponding UE, that is, even for a UE to which a CA is applied, one downlink bandwidth part and / or uplink bandwidth part is activated for each serving cell. By using the radio resources of the corresponding serving cell (serving cell) has been defined to use for transmitting and receiving uplink / downlink data.

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

However, in any serving cell, a plurality of downlink and / or uplink bandwidth parts are simultaneously activated and used according to the capability and bandwidth part (s) configuration of the terminal. In NR rel-15, only one downlink bandwidth part and one uplink bandwidth part may be activated at an arbitrary time in an arbitrary terminal in NR rel-15. .

Uplink Control Information (UCI) Transmission Procedure

According to the PUCCH resource allocation method for HARQ ACK / NACK feedback of the terminal defined in the NR, when the PDSCH resource allocation, the base station corresponds to the ACK resource indicator (ARI) information region of the DL assignment DCI format (DL assignment DCI format) Indicates uplink control channel (PUCCH) resource allocation information for HARQ ACK feedback for the PDSCH. In more detail, the base station configures one or more PUCCH resource set configuration information consisting of one or more PUCCH resources for each uplink bandwidth part (UL BWP) configured for an arbitrary terminal through RRC signaling. Send to the terminal. Accordingly, the ARI is defined to indicate a PUCCH resource index for HARQ ACK feedback for a certain PDSCH, and the PUCCH resource set includes a payload size of UCI to be transmitted through a PUCCH of a corresponding slot. Determined by

In addition, PUCCH resources for UCI transmission such as scheduling request (SR) or channel state information (CSI) other than HARQ ACK / NACK may also be allocated through higher layer signaling, or may include downlink control information (Downlink Control Information); May be indicated via DCI).

However, when a PUCCH resource for UCI transmission and a PUSCH resource for data transmission overlap in a time interval in a certain slot, the corresponding UCI may be multiplexed onto the PUSCH and transmitted.

Specifically, according to the method for multiplexing and reporting UCI to PUSCH, PUCCH resources for UCI transmission and PUSCH transmission resources for data transmission overlap each other in a time interval, and the uplink / downlink transmission / reception processing time of the corresponding UE ( When a time condition considering a processing time is satisfied, the UCI is defined to be multiplexed and transmitted through a PUSCH transmission resource. In this case, the base station sets a specific value for UCI multiplexing, that is, an offset value (β _offset ) for determining the amount of resources to be used for UCI transmission among the allocated PUSCH transmission resources, so that the DCI or higher layer signaling (higher) is performed. layer signaling) to be transmitted to the terminal.

NR-U

In the case of an unlicensed band, unlike a licensed band, any operator or individual can be used to provide a wireless communication service within the regulation of each country, not a wireless channel exclusively used by any operator. Accordingly, when providing NR service through unlicensed band, co-existence problem with various short range wireless communication protocols such as WiFi, Bluetooth, NFC, etc. already provided through the unlicensed band, and also between each NR operator or LTE provider There is a need for a solution to co-existence problems.

Accordingly, when providing an NR service through an unlicensed band, the power level of a radio channel or a carrier to be used is sensed by transmitting a radio signal before transmitting a radio signal to avoid interference or collision between respective radio communication services. There is a need to support a List Before Talk (LBT) based wireless channel access method for determining whether a channel or a carrier is available. In this case, if a specific radio channel or carrier of the unlicensed band is in use by another radio communication protocol or another operator, the radio communication service through the unlicensed band is not licensed band because there is a possibility of being restricted by the provision of NR service through the band. Unlike the wireless communication service through the LAN, the QoS required by the user cannot be guaranteed.

In addition, when any wideband NR-U cell is configured through an unlicensed band, coexistence with other RATs should be considered in order to increase an access probability for the corresponding NR-U cell. In this case, the system bandwidth of any NR-U cell or DL or UL BWP configured for any UE in the corresponding NR-U cell is divided into subbands, and LBT is performed in units of the corresponding subbands, so that the corresponding subbands are performed. There is a need for a design of a wireless protocol for transmitting a band-by-band radio signal.

Hereinafter, a method of transmitting and receiving uplink control information in an unlicensed band will be described in detail with reference to the accompanying drawings.

FIG. 10 is a diagram illustrating a procedure for transmitting uplink control information in an unlicensed band by a terminal according to an embodiment.

Referring to FIG. 10, a UE may perform a first radio on at least one subband allocated to transmission of an uplink shared channel (PUSCH) among a plurality of subbands for a bandwidth part configured in an unlicensed band. Resource information may be received (S1000).

In NR, a bandwidth part (BWP) may be configured for each terminal for transmitting and receiving an uplink or downlink wireless physical channel and a physical signal for the terminal. The terminal may transmit and receive data by activating one BWP among the configured BWPs. Since the system bandwidth constituting the NR cell can be configured with a broadband of 100 MHz or more, a bandwidth of one BWP for any terminal can also be configured with a broadband of 100 MHz or more.

On the other hand, in order to transmit a radio signal from any node in the unlicensed band, LBT is first performed to check whether the radio channel is occupied by another node. Accordingly, the base station performs an LBT for a frequency band in which a corresponding NR-U cell is configured to transmit a PDSCH for a UE in an NR-U cell in an unlicensed band, and when the corresponding frequency band is empty, the PDCCH and the corresponding PDSCH You can perform the transfer. Similarly, in order to transmit an uplink signal, the terminal must first perform LBT on the corresponding uplink radio channel.

When configuring the BWP for the unlicensed band, the bandwidth of the DL BWP or UL BWP for any terminal in the NR-U cell may also be configured larger than 20MHz. In this case, when performing data transmission and reception by performing LBT in the corresponding BWP unit, compared to other radio access technology (RAT) such as WiFi that performs LBT in 20 MHz unit, it is competitive in terms of channel access probability. Can be seriously degraded.

Accordingly, a plurality of subbands having arbitrary bandwidths may be configured for the DL BWP or the UL BWP configured for the UE. The base station or the terminal may perform LBT on a per subband basis. In addition, resource allocation for the DL BWP and transmission / reception of PDCCH or PDSCH may be performed in units of corresponding subbands. Similarly, resource allocation for the UL BWP and transmission / reception of PUCCH or PUSCH may be performed in units of corresponding subbands.

When resource allocation is performed in units of subbands, the UE may receive, from a base station, first radio resource information, which is information on PUSCH resources allocated through a plurality of subbands for a BWP configured in an unlicensed band in one slot. .

Referring back to FIG. 10, the terminal may receive second radio resource information allocated for transmission of uplink control information (UCI) (S1010).

Apart from the above reception of the first radio resource information, the UE may receive second radio resource information on PUCCH resources for UCI reporting such as HARQ-ACK information, CSI or SR in one slot.

Referring back to FIG. 10, when the second radio resource allocated to the transmission of the uplink control information is indicated in the same slot as the first radio resource allocated to the transmission of the uplink data channel, the terminal uplinks the uplink control information. By multiplexing the link data channel (S1020), an uplink data channel multiplexed with uplink control information may be transmitted (S1030).

In the unlicensed band, when a PUCCH resource for UCI transmission such as HARQ-ACK information and a PUSCH transmission resource overlap with respect to the same slot, the UE may transmit the UCI multiplexed to the PUSCH transmission resource to the base station.

According to an embodiment, the terminal may determine one subband to multiplex UCI among the PUSCH transmission resources through the allocated plurality of subbands. The UE may multiplex and transmit the UCI only for the PUSCH resource transmitted through the determined subband.

According to an example, in order to determine one subband for multiplexing UCI, the terminal may receive information indicating the subband determined at the base station from the base station. The subband indication information for multiplexing of UCI may be index indication information of the determined subband. The terminal may receive the subband indication information from the base station through DCI, which is RRC signaling, MAC CE signaling, or L1 control signaling.

In this case, if the LBT of the UE for the indicated subband fails, for example, the UE may not transmit by multiplexing the UCI to the PUSCH resource. Alternatively, as another example, the UE may transmit the multiplexed UCI to the PUSCH of the subband corresponding to the index after the indicated subband. Alternatively, as another example, the UE may transmit the PUCCH resource allocated for the UCI without multiplexing the UCI to the PUSCH resource.

Alternatively, according to another example, a subband for multiplexing UCI may be determined implicitly. For example, the UE may multiplex and transmit the UCI through the PUSCH of the subband corresponding to the lowest index among the plurality of subbands to which the PUSCH transmission resource is allocated.

Even in this case, if the LBT of the UE for the indicated subband fails, for example, the UE may not transmit by multiplexing the UCI to the PUSCH resource. Alternatively, as another example, the UE may transmit the multiplexed UCI to the PUSCH of the subband corresponding to the index after the indicated subband. Alternatively, as another example, the UE may transmit the PUCCH resource allocated for the UCI without multiplexing the UCI to the PUSCH resource. Alternatively, as another example, the UE may transmit by multiplexing the UCI through the subband of the lowest index among the subbands having succeeded in LBT.

According to another example, the UE may transmit by multiplexing the UCI through the PUSCH of the subband of the same index as the subband where the PUCCH resource allocation is made for UCI transmission. If a plurality of subbands are allocated for PUCCH transmission, the UE may multiplex and transmit the UCI through the PUSCH of the lowest index subband to which the PUSCH is allocated among the subbands to which the PUCCH resource is allocated.

According to another example, a subband for multiplexing UCI may be determined as a subband of the lowest index within a subband in which LBT succeeds among the PUSCH or PUCCH allocation subbands.

According to another embodiment, when M subbands are allocated to PUSCH transmission among N subbands constituting UL BWP, the UE multiplexes UCI to PUSCH transmission resources in K subbands determined among M subbands. can do. In this case, M may be one or more natural numbers, and K may be one or more natural numbers. That is, when K is equal to M, the UE may repeatedly multiplex the same UCI through all subbands allocated for PUSCH transmission. The UE may transmit the same UCI to be reported to the base station by multiplexing all PUSCH transmission resources allocated to each subband.

Alternatively, when K is smaller than M, the terminal may transmit the multiplexed UCI through one or more subbands. For example, when M subbands in which PUSCH resource allocation is performed among all N subbands are M, the UE may perform UCI multiplexing through one or more arbitrary K subbands. In this case, the UE may receive information on K subbands from the base station through RRC signaling, MAC CE signaling, or L1 control signaling. In this case, the information on the K subbands may be indicated in the form of a bitmap for each N subbands constituting the corresponding UL BWP.

Alternatively, the K subbands may be determined as subbands having the same index as the subband where the PUCCH resource allocation for UCI transmission is performed among the M subbands for which the corresponding PUSCH resource allocation is performed.

According to another embodiment, the terminal may perform PUSCH transmission based UCI multiplexing on a slot basis. When a PUSCH transmission resource through a plurality of subbands is allocated in an arbitrary slot, the UE may perform UCI multiplexing based on all PUSCH transmission resources of the corresponding slot. For example, when a PUSCH transmission resource through M subbands is allocated in a UL BWP having N subband configurations, the UE may multiplex and transmit UCI based on M PUSCH transmission resources allocated in a corresponding slot. .

Accordingly, a piggyback method and apparatus capable of transmitting and receiving multiplexing uplink control information on an uplink data channel (PUSCH) in an unlicensed band can be provided.

11 is a diagram illustrating a procedure of receiving uplink control information in an unlicensed band by a base station according to an embodiment.

Referring to FIG. 11, the base station may transmit first radio resource information for at least one subband allocated to transmission of an uplink data channel among a plurality of subbands for bandwidth parts configured in the unlicensed band (S1100). ).

As described above, when resource allocation is performed in units of subbands, the base station performs UE information on the first radio resource information, which is information on PUSCH resources allocated through a plurality of subbands for a BWP configured in an unlicensed band in one slot. Can be sent to.

Referring to FIG. 11 again, the base station may transmit second radio resource information allocated for transmission of uplink control information (UCI) (S1110).

In addition to receiving the aforementioned first radio resource information, the base station may transmit second radio resource information on PUCCH resources for UCI reporting such as HARQ-ACK information, CSI or SR in one slot to the terminal.

Referring back to FIG. 11, when the second radio resource allocated to the transmission of the uplink control information is indicated in the same slot as the first radio resource allocated to the transmission of the uplink data channel, the uplink control information is multiplexed. The received uplink data channel may be received (S1120).

In the unlicensed band, when a PUCCH resource for UCI transmission such as HARQ-ACK information and a PUSCH transmission resource overlap for the same slot, the base station may receive a PUSCH multiplexed with UCI from the terminal.

According to an embodiment, the terminal may determine one subband to multiplex UCI among the PUSCH transmission resources through the allocated plurality of subbands. The base station may receive the multiplexed UCI for the PUSCH resources transmitted on the subband determined by the terminal.

According to an example, the base station may transmit information indicating one subband for multiplexing UCI to the terminal. The subband indication information for the multiplexing of the UCI may be index indication information of the subband. The base station may transmit the subband indication information to the terminal through DCI which is RRC signaling, MAC CE signaling or L1 control signaling. The terminal may determine one subband for multiplexing the UCI according to the subband indication information.

In this case, if the LBT of the UE for the indicated subband fails, for example, the UE may not transmit by multiplexing the UCI to the PUSCH resource. Alternatively, as another example, the base station may receive the UCI multiplexed on the PUSCH of the subband corresponding to the index after the indicated subband index. Or, as another example, the base station may receive through the PUCCH resources allocated for the UCI.

Alternatively, according to another example, a subband for multiplexing UCI may be determined implicitly. For example, the UE may multiplex and transmit the UCI through the PUSCH of the subband corresponding to the lowest index among the plurality of subbands to which the PUSCH transmission resource is allocated.

Even in this case, if the LBT of the UE for the indicated subband fails, for example, the UE may not transmit by multiplexing the UCI to the PUSCH resource. Alternatively, as another example, the base station may receive the UCI multiplexed on the PUSCH of the subband corresponding to the index after the indicated subband index. Or, as another example, the base station may receive through the PUCCH resources allocated for the UCI. Alternatively, as another example, the base station may receive the multiplexed UCI through the subband of the lowest index among the subbands successful LBT.

According to another example, the base station may receive the multiplexed UCI through the PUSCH of the subband of the same index as the subband where the PUCCH resource allocation for the UCI transmission. If a plurality of subbands are allocated for PUCCH transmission, the base station may receive the multiplexed UCI through the PUSCH of the lowest index subband to which the PUSCH is allocated among the subbands to which the PUCCH resource is allocated.

According to another example, a subband for multiplexing UCI may be determined as a subband of the lowest index within a subband in which LBT succeeds among the PUSCH or PUCCH allocation subbands.

According to another embodiment, when M subbands are allocated to PUSCH transmission among N subbands constituting UL BWP, the UE multiplexes UCI to PUSCH transmission resources in K subbands determined among M subbands. can do. In this case, M may be one or more natural numbers, and K may be one or more natural numbers. That is, when K is equal to M, the UE may repeatedly multiplex the same UCI through all subbands allocated for PUSCH transmission. The base station may receive the same UCI multiplexed on all PUSCH transmission resources allocated to each subband.

Alternatively, when K is smaller than M, the terminal may transmit the multiplexed UCI through one or more subbands. For example, when M subbands in which PUSCH resource allocation is performed among all N subbands are M, the UE may perform UCI multiplexing through one or more arbitrary K subbands. In this case, the base station may transmit information on the K subbands to the terminal through RRC signaling, MAC CE signaling, or L1 control signaling. In this case, the information on the K subbands may be indicated in the form of a bitmap for each N subbands constituting the corresponding UL BWP.

Alternatively, the K subbands may be determined as subbands having the same index as the subband where the PUCCH resource allocation for UCI transmission is performed among the M subbands for which the corresponding PUSCH resource allocation is performed.

According to another embodiment, the base station may receive the multiplexed UCI based on PUSCH transmission on a slot basis. When a PUSCH transmission resource through a plurality of subbands is allocated in an arbitrary slot, the UE may perform UCI multiplexing based on all PUSCH transmission resources of the corresponding slot. For example, when a PUSCH transmission resource through M subbands is allocated in a UL BWP having N subband configurations, the UE may multiplex and transmit UCI based on M PUSCH transmission resources allocated in a corresponding slot. .

Accordingly, a piggyback method and apparatus capable of transmitting and receiving multiplexing uplink control information on an uplink data channel (PUSCH) in an unlicensed band can be provided.

Hereinafter, each embodiment of transmitting uplink control information in an unlicensed band in NR will be described in detail with reference to the associated drawings.

As described above, in order to transmit a radio signal from any node in the unlicensed band, it is required to go through a List Before Talk (LBT) process to check whether the corresponding radio channel is occupied by another node.

Accordingly, in order to transmit PDSCH for an arbitrary UE in an NR-U cell of an unlicensed band configured by an arbitrary NR base station, the base station must perform LBT for the corresponding unlicensed band. As a result of performing LBT, when the radio channel of the corresponding unlicensed band is empty, the base station may transmit a PDCCH and a corresponding PDSCH to the terminal.

Similarly, in order to transmit an uplink signal in the unlicensed band, the terminal also needs to perform LBT on the unlicensed band before transmitting the uplink signal.

According to an example, in NR, a base station sets RRC signaling or instructs a corresponding terminal through DL assignment DCI (DL assignment DCI) for HARQ ACK / NACK feedback timing for PDSCH reception of a terminal. Can be. However, in the case of the NR-U cell for the aforementioned unlicensed band, PUCCH transmission including HARQ ACK / NACK feedback information may not be possible at the time indicated by the base station according to the LBT result of the terminal. That is, if LBT failure occurs when the corresponding radio channel is occupied by another node as a result of LBT, the UE cannot transmit HARQ ACK / NACK feedback information according to PDSCH at the time indicated by the base station. do. This may cause serious degradation in HARQ performance in the NR-U cell.

12 illustrates an example of performing LBT for wireless communication in an unlicensed band according to an embodiment.

According to an example, when allocating PUCCH transmission resources for an arbitrary terminal or when allocating PUSCH transmission resources, at a corresponding PUCCH or PUSCH transmission time, the base station may indicate whether to perform LBT on the corresponding terminal. The UE may transmit uplink control information (UCI) such as HARQ ACK / NACK feedback information or CQI / CSI reporting information to the base station through the PUCCH. In this regard, in the NR, a time resource and a frequency resource, which are PUCCH resources for transmitting HARQ feedback, may be indicated by a base station through a DL assignment DCI. Alternatively, the PUCCH resource for transmitting HARQ feedback may be set to semi-static through RRC signaling. In particular, in the case of time resources, a timing gap value between a PDSCH reception slot and a corresponding HARQ feedback information transmission slot may be transmitted to a UE through DL assignment DCI or RRC signaling.

PUCCH resources for CQI / CSI reporting may also be allocated through RRC signaling and DL assignment DCI.

Referring to FIG. 12, the LBT (DL LBT) for downlink transmission is successful in the base station, and it is indicated by hatching that downlink transmission is performed through the unlicensed band at a later time. According to an example, the downlink transmission may be a transmission of a downlink channel or a signal indicating uplink transmission. For example, a PUCCH for PDSCH transmission and a corresponding HARQ feedback, a DCI requiring CQI / CSI reporting, a PUCCH for reporting accordingly, or a DCI for transmitting scheduling information for a PUSCH and a corresponding PUSCH, etc. Can be. In this case, a timing gap occurs between downlink transmission and uplink transmission.

For example, when a downlink signal or channel according to downlink transmission indicates PUCCH transmission in an NR-U cell that is an unlicensed band, the UE basically transmits the corresponding PUCCH according to regulation of an unlicensed spectrum. The LBT (UL LBT) must be performed first, and the PUCCH transmission at the indicated time is determined according to the LBT result. If, as a result of the LBT, the corresponding radio channel is occupied by another node, that is, when an LBT failure occurs, the corresponding UE may not perform PUCCH transmission at the indicated time.

However, a PDSCH transmission slot and a corresponding PUCCH transmission slot according to a DL assignment DCI transmission slot or a corresponding DL assignment DCI including a PUCCH resource allocation information and PUCCH transmission indication information are corresponding base stations. If the UE belongs to the Channel Occupancy Time (COT) of the UE, PUCCH transmission may be possible in the corresponding UE without performing LBT. This is because the base station is already occupied for downlink transmission to the corresponding UE in the unlicensed band and is not occupied by another node. That is, depending on the COT of the base station and the setting of the K1 value, the HARQ feedback transmission through the PUCCH may be possible in the corresponding terminal without LBT.

Similarly, when CSI / CQI reporting through PUCCH is indicated through DL assignment DCI, a slot in which DL assignment DCI is transmitted and CQI / CSI reporting accordingly If a timing gap value between slots in which PUCCH transmission including reporting information is made is M, CSI / CQI reporting through PUCCH without LBT in the corresponding UE according to the corresponding timing gap value M and the COT of the base station. This may be possible.

In addition, similar to the case of the PUCCH, the K2 value, which is timing gap information between the UL grant DCI transmitted by the base station and the slot in which the PUSCH is transmitted, is also used for the PUSCH transmission of the UE. May be set to semi-static through RRC signaling or may be set to dynamic through UL grant DCI (UL grant DCI). Even in this case, when an uplink grant DCI (UL grant DCI) transmission slot including corresponding PUSCH transmission resource allocation information and a corresponding PUSCH transmission slot belong to within a COT (Channel Occupancy Time) of the base station, the UE does not perform the LBT without performing the PUSCH. Transmission may be possible.

In this regard, according to an embodiment of the present disclosure, the base station may instruct the terminal by setting an LBT scheme for performing LBT when PUCCH or PUSHC transmission from any terminal. According to an example, the LBT scheme may be divided into a plurality of schemes by at least one of whether to perform LBT, random back off, and random back off time. In the present disclosure, a method of performing LBT is referred to as an 'LBT method', but is not limited thereto. The manner of performing the LBT may be variously referred to as the LBT category.

According to an embodiment, the LBT method is a first LBT method that does not perform LBT, a second LBT method that performs LBT but does not perform random backoff, performs a random backoff with the LBT, but the random backoff time interval is fixed. The third LBT scheme and the random backoff with the LBT may be performed, but the random backoff time interval may include a fourth LBT scheme and the like.

According to an example, it may be defined that the base station directly indicates whether to perform LBT for uplink transmission of the terminal through L1 control signaling. In more detail, it may be defined to include a corresponding LBT indication information region in a DL assignment DCI format for transmitting PDSCH scheduling control information.

For example, the LBT indication information may be indication information of 1 bit. In this case, when PUCCH transmission of a UE corresponding to a corresponding DL assignment DCI format (DL assignment DCI format) is determined according to the value (0, 1) of the corresponding bit, it may be defined to determine whether to perform LBT on the corresponding UE. have. That is, in this case, the value of the corresponding bit may mean that the first LBT scheme and the remaining LBT schemes are distinguished from the aforementioned LBT schemes.

According to another example, the corresponding LBT indication information may be two bits of indication information. In this case, when transmitting the PUCCH of the terminal corresponding to the DL assignment DCI format (DL assignment DCI format) according to the value of the corresponding bit (00, 01, 10, 11), the LBT scheme for performing the LBT in the terminal Can be defined to be determined. That is, in this case, the value of the corresponding bit may mean that the first LBT scheme and the fourth LBT scheme are distinguished from the aforementioned LBT scheme.

In this case, the PUCCH transmission of the terminal corresponding to the DL assignment DCI format described above is transmitted to the HARQ feedback information of the terminal according to the PDSCH reception of the terminal based on the DL assignment DCI format. It may be a PUCCH transmission for. Alternatively, in another case of PUCCH transmission of a UE corresponding to a DL assignment DCI format, CQI / CSI reporting is triggered by a corresponding DL assignment DCI format. ), It may be a PUCCH transmission for CQI / CSI reporting accordingly.

Similarly, the UL grant DCI format (UL grant DCI format) for transmitting PUSCH scheduling control information may be defined to include a corresponding LBT indication information (LBT indication information) region.

For example, the LBT indication information may be indication information of 1 bit. In this case, according to the value (0, 1) of the corresponding bit, when the PUSCH transmission of the terminal corresponding to the UL grant DCI format (UL grant DCI format), it can be defined to determine whether to perform the LBT in the terminal. have. That is, in this case, the value of the corresponding bit may mean to distinguish the first scheme from the other schemes among the aforementioned LBT schemes.

According to another example, the corresponding LBT indication information may be two bits of indication information. In this case, when the PUSCH of the UE corresponding to the UL grant DCI format (UL grant DCI format) according to the value of the corresponding bit (00, 01, 10, 11), the LBT scheme for performing the LBT in the UE Can be defined to be determined. That is, in this case, the value of the corresponding bit may mean that the first to fourth schemes are distinguished from the aforementioned LBT schemes.

However, the PUSCH transmission of the terminal corresponding to the UL grant DCI format may be a PUSCH transmission for uplink data transmission of the terminal or a PUSCH transmission for UCI transmission of the terminal.

As another embodiment of defining whether to perform LBT for the uplink transmission or the LBT scheme in the terminal, whether to perform the corresponding LBT is as shown in FIG. 12, downlink transmission indicated by the corresponding uplink transmission and corresponding uplink It may be defined to be determined by a timing gap value between transmissions.

According to an example, when a timing gap value is smaller than a certain threshold value, respectively, the UE may define that the indicated PUCCH or PUSCH transmission is possible without LBT. Alternatively, if a timing gap value is larger than a corresponding threshold, it may be defined so that the UE can perform a corresponding PUCCH or PUSCH transmission after performing LBT.

According to an example, the threshold is determined by the COT value in the corresponding NR-U, or accordingly cell-specific RRC signaling or UE-specific RRC signaling by the base station It may be configured through specific RRC signaling, or may be configured through cell-specific RRC signaling or UE-specific RRC signaling by a base station regardless of a COT.

In addition, the corresponding threshold is defined as a single threshold for each uplink transmission case or as a different threshold to be used for cell-specific RRC signaling by the base station. It may be configured through specific RRC signaling or UE-specific RRC signaling.

Accordingly, the LBT scheme to be performed to transmit the uplink signal in the unlicensed band can be determined, and the uplink signal can be transmitted in the unlicensed band according to the determined LBT scheme.

The present disclosure relates to a specific method of multiplexing and transmitting a corresponding UCI in a transmission resource of a corresponding PUSCH when a PUSCH transmission is indicated in a same slot to a UE configured to transmit a UCI such as HARQ ACK, SR, or CSI in an arbitrary slot. Suggest. In particular, the present disclosure proposes a specific UCI multiplexing method when PUSCH transmission on one or more subbands is indicated in one BWP in an NR-U cell.

In this regard, first, a resource allocation method of a PUCCH for transmitting a UCI will be described. After that, the resource allocated for the transmission of the PUCCH and the resource allocated for the transmission of the PUSCH overlap in a time period. The piggyback method will be described.

As described above, in order to transmit a radio signal from any node in the unlicensed band, the LBT should be preferentially performed to check whether the radio channel is occupied by another node. Therefore, in order to transmit PDSCH for an arbitrary UE in an NR-U cell configured by an arbitrary NR base station, the base station performs an LBT for a frequency band configured with the corresponding NR-U cell, and then the PDCCH and Accordingly, PDSCH transmission can be performed. Similarly, in order to transmit an uplink signal, the terminal must first perform LBT on the corresponding uplink radio channel.

In the NR, as described above, a bandwidth part (BWP) is configured for each UE for uplink or downlink wireless physical channel and physical signal transmission and reception, and one BWP is activated and used. In addition, unlike LTE, the system bandwidth constituting the NR cell can be configured with a broadband of 100 MHz or more according to the FR (Frequency Range) in which the corresponding NR cell is configured. This is possible. On the other hand, if the DL or UL BWP for any UE is greater than 20MHz in the NR-U cell configured through an unlicensed spectrum, when performing uplink or downlink transmission / reception by performing LBT on a corresponding BWP basis, Competitiveness may be seriously degraded in terms of channel access probability compared to other RATs such as WiFi, which performs LBT in units of 20 MHz.

In order to solve this problem, any DL or UL BWP configured for any UE is partitioned into subbands having arbitrary bandwidths to perform LBT in units of corresponding subbands, and uplink / downlink control channel and data channel. The method of transmitting and receiving may be considered. For example, when the bandwidth of a DL BWP configured for any UE is 80MHz, the DL BWP is divided into four subbands having a bandwidth of 20MHz, and resource allocation in units of corresponding subbands and transmission / reception of PDCCH or PDSCH according thereto are possible. Can be defined to

In the case of uplink may be similarly defined. Referring to FIG. 13, it is shown that a UL BWP is composed of N subbands. For example, when an arbitrary UL BWP bandwidth is 60 MHz, the UL BWP may be divided into three subbands having a bandwidth of 20 MHz, and may be defined to allow resource allocation in corresponding subband units and PUCCH or PUSCH transmission and reception accordingly. .

Hereinafter, as described above, assuming that a plurality of subbands are configured for a UL BWP and a DL BWP in a terminal, a resource allocation method of a PUCCH for transmitting UCI will be described with reference to related drawings.

In NR, the HARQ ACK / NACK feedback timing for PDSCH reception of the UE may be set to RRC at the base station or may be indicated to the UE through DL assignment DCI. However, in the case of the NR-U cell, PUCCH transmission including HARQ ACK / NACK feedback information may be impossible at the time indicated by the base station according to the LBT result of the terminal. That is, when the LBT failure occurs when the radio channel is occupied by another node as a result of the LBT, the UE cannot transmit HARQ ACK / NACK feedback information according to the PDSCH at the indicated time. This can cause serious degradation in HARQ performance in the NR-U cell.

Accordingly, the present disclosure proposes a HARQ ACK / NACK feedback method of a terminal for an NR-U cell. In addition, the present disclosure may additionally include a PUCCH transmission method including other types of UCI, such as SR or CSI / CQI feedback, as well as HARQ ACK feedback.

In order to solve the PUCCH transmission problem of the terminal in the above-described NR-U cell, according to an example, to provide a plurality of PUCCH transmission opportunities in the frequency axis for HARQ ACK / NACK feedback of the terminal in any slot May be considered. Referring to FIG. 14, a case where a slot instructed to transmit HARQ ACK / NACK feedback information for a PDSCH received through slot #n in a certain terminal to a base station is slot # (n + k) is illustrated. By providing a PUCCH transmission opportunity composed of a plurality of PUCCH for HARQ ACK / NACK feedback of the terminal in the corresponding slot # (n + k), through the PUCCH of the radio channel successful LBT of the plurality of PUCCH transmission opportunities in the terminal HARQ ACK / NACK feedback information may be transmitted to the base station.

The present disclosure proposes a specific method for allocating a plurality of PUCCH transmission opportunities composed of a plurality of PUCCHs as described above for HARQ ACK / NACK feedback in an arbitrary slot.

In the present disclosure, as described above, for convenience of description, a PUCCH transmission opportunity including a plurality of PUCCH transmission opportunities including a plurality of PUCCH resources allocated for HARQ ACK / NACK feedback of any one UE in any one slot is provided. This is called. However, this is only an example of a name for convenience of description, and the present disclosure is not limited thereto and the concept of the present disclosure may be applied regardless of the name.

Example 1-1. PUCCH resource set based configuration

According to the PUCCH resource allocation method of NR, the base station configures one or more PUCCH resource set composed of one or more PUCCH resources for HARQ ACK / NACK feedback of the terminal and transmits to each terminal through RRC signaling, ARI of the DL assignment DCI It is defined to indicate PUCCH resource index information in the PUCCH resource set to be used for HARQ ACK / NACK feedback for the corresponding PDSCH through. However, at this time, the PUCCH resource set is determined by the corresponding UCI payload size.

As such, in the NR, one or more PUCCH resource sets composed of one or more PUCCH resources for any terminal may be configured by the base station. Accordingly, as a first method of configuring a plurality of PUCCH opportunity sets in an NR-U cell, it may be defined to reuse each PUCCH resource set configured for the corresponding UE.

As an example of this, the PUCCH opportunity set for any UE may be defined to be configured with the same set as the PUCCH resource set configured for the UE. That is, the PUCCH opportunity set for any terminal may be defined to be configured to be completely identical to the PUCCH resource set configured for the corresponding UE and the PUCCH resources constituting each PUCCH resource set. For example, it is assumed that four PUCCH resource sets are configured for a certain UE and each PUCCH resource set is configured of eight PUCCH resources. In this case, the PUCCH opportunity set for the corresponding UE may be defined to be configured as four PUCCH opportunity sets each consisting of eight PUCCH resources. Accordingly, in case of a UE instructed to transmit HARQ ACK / NACK feedback information through an NR-U cell, a PUCCH resource set determined according to the UCI payload size and irrespective of a setting value of an ARI information region of a DL assignment DCI format; PUCCH resources of the same PUCCH opportunity set may be defined to be interpreted as PUCCH transmission opportunities for a corresponding UE. In this case, however, the corresponding DL assignment DCI format may be defined not to include the ARI information region or may be defined to be set by the base station.

Alternatively, in the case of a UE configured to transmit PUCCH in an NR-U cell, the ARI information region of the corresponding DL assignment DCI format is not PUCCH resource index indication information, but PUCCH resource set indication information and corresponding PUCCH opportunity set accordingly. As the indication information, the base station may be set and interpreted by the terminal. In this case, the PUCCH opportunity set constituting the PUCCH transmission opportunities to be used for HARQ ACK / NACK feedback in any UE is not a PUCCH resource set according to the UCI payload size and a PUCCH opportunity set according to the ARI of the corresponding DL assignment DCI format. It may be defined as a PUCCH resource set and a corresponding PUCCH opportunity set indicated through the information area.

As another example of configuring a PUCCH opportunity set by reusing each PUCCH resource set configured for a corresponding UE, a PUCCH opportunity set for a corresponding UE is defined as a subset of each PUCCH resource set configured for the corresponding UE. Can be defined to be set. That is, one PUCCH opportunity set is configured within PUCCH resources constituting one PUCCH resource set, and the PUCCH opportunity set configuration accordingly may be configured by a predetermined rule or may be configured by setting of a base station. Can be.

As an example of configuring a PUCCH opportunity set according to an arbitrary rule, a group of PUCCH resources of a specific index among the PUCCH resources constituting each PUCCH resource set configured for a certain UE is grouped. It can be defined to form a PUCCH opportunity set. For example, it may be defined to configure one PUCCH opportunity set with PUCCH resources of even indexes among PUCCH resources in one PUCCH resource set. Similarly, the PUCCH resources of the odd index may be defined to constitute another PUCCH opportunity set. Alternatively, PUCCH resources constituting an arbitrary PUCCH resource set may be divided into two groups to define each PUCCH opportunity set as PUCCH resources of an upper index and PUCCH resources of a lower index. In this case, when four PUCCH resource sets composed of eight PUCCH resources from PUCCH resource index # 0 to # 7 are configured for a certain UE, the corresponding UE has eight PUCCH opportunity sets each composed of four PUCCH resources. Will be configured.

As an example of configuring the PUCCH opportunity set according to the setting of the base station, the base station may define at least one parameter for configuring the PUCCH opportunity set in any terminal and transmit it to the corresponding terminal through RRC signaling. For example, the PUCCH opportunity set for any UE may be determined by a single parameter, N value, and the N value is the number of PUCCH opportunity sets or PUCCH configured in each PUCCH resource set configured for the UE. It can be the size of the opportunity set. For example, if the corresponding parameter, N value, is the number of PUCCH opportunity sets, each PUCCH opportunity set modulo N value to a PUCCH resource index constituting a PUCCH resource set for each PUCCH resource set configured for the corresponding UE. The value taken may consist of the same PUCCH resources.

When the PUCCH opportunity set is configured as a subset of the PUCCH resource set as described above, when the ARI information area of the DL assignment DCI format is set in the base station and interpreted by the terminal, the PUCCH opportunity set including the PUCCH resource index indicated by the corresponding ARI is included. The terminal may be defined to be interpreted as PUCCH transmission opportunities. Alternatively, when the ARI information region of the DL assignment DCI format is set in the base station and interpreted by the terminal, it may be defined to directly indicate the index of the PUCCH opportunity set through the corresponding ARI information region.

Example 1-2. BWP-based configuration

As another embodiment of configuring a PUCCH opportunity set for a terminal, a PUCCH opportunity set may be defined as PUCCH resources of the same index of the same PUCCH resource set for each BWP set for the terminal. That is, as shown in FIG. 15, when four BWPs are configured for a certain UE, PUCCH resources of the same index of the same PUCCH resource set are grouped among PUCCH resources for each PUCCH resource set configured for each BWP. It can be defined as a PUCCH opportunity set.

Accordingly, when the base station indicates the PUCCH resource index to be used for HARQ ACK / NACK feedback from any terminal through the ARI of the DL assignment DCI, configured for the terminal according to the UCI payload size and the PUCCH resource index indicated by the ARI In every UL BWP, PUCCH resource indexes of a PUCCH resource set determined by the UCI payload size and ARI indication may be defined such that a PUCCH opportunity set for HARQ ACK / NACK feedback of a corresponding UE is determined.

Example 1-3. Subband based configuration in one BWP

The base station may configure each PUCCH resource constituting the PUCCH resource set and the PUCCH resource set for any terminal in the same manner as before. For the PUCCH resources configured as described above, PUCCH resources having the same form in subband units on the frequency axis may be configured to configure one PUCCH opportunity set as identical PUCCH resources in the corresponding subband units. That is, as shown in FIG. 16, one UL BWP configured for any UE may be partitioned into any N subbands for PUCCH opportunity set configuration. In this case, one PUCCH opportunity set as PUCCH resources having identical PUCCH resources, that is, PUCCH format and time / frequency / code domain resource allocation, are identical in each subband. It can be defined to be configured. Accordingly, when the PUCCH resource set for a certain UE and the PUCCH resource setting for each PUCCH resource set are configured by the base station, each PUCCH resource is copied and pasted in subband units. A PUCCH opportunity set corresponding to the corresponding PUCCH resource may be configured.

In addition, according to the PUCCH opportunity set to be used for HARQ ACK / NACK feedback in any slot in any terminal, the PUCCH opportunity set corresponding to the PUCCH resource of the PUCCH resource set determined by the UCI payload size and ARI of the DL assignment DCI Can be defined as

However, a subband for configuring a PUCCH opportunity set in any UL BWP may be set by the base station or implicitly determined. For example, a subband size such as the number of subbands for configuring a PUCCH opportunity set or the bandwidth of a subband or the number of PRBs may be set for each BWP by a base station, and the corresponding setting value is RRC signlaing. It can be defined to be transmitted to each terminal through. Alternatively, the size of the subband or the number of subbands may be defined as a function of a bandwidth of the UL BWP, a configured frequency range of the NR-U cell, and the like.

Example 1-4. Directly set the PUCCH opportunity set

When setting PUCCH in NR-U cell, define PUCCH opportunity set directly and transmit through RRC signaling so that each PUCCH resource index constituting PUCCH resource set corresponds to one PUCCH opportunity set instead of one PUCCH resource. can do.

As such a method of directly configuring a PUCCH opportunity set, it may be defined to set each PUCCH resource constituting a PUCCH opportunity set corresponding to each PUCCH resource index. That is, PUCCH format configuration information, PRB allocation information, symbol allocation information, frequency hopping information, code resource allocation information, etc., which are each PUCCH resource configuration information constituting one PUCCH opportunity set It may be defined to be separately set by the base station to be transmitted to the corresponding terminal.

Alternatively, some of the information may be set identically to the corresponding PUCCH resource configuration information, and only some of the remaining information may be separately set. For example, the PUCCH format setting information, PRB allocation information, symbol allocation information, code resource allocation information, etc., which are the number of PRBs, are set to be single, and only PRB offset information is set separately so that one PUCCH opportunity set is configured. Can be defined

As such, when a PUCCH opportunity set is directly configured through RRC signaling, a PUCCH opportunity set to be used for HARQ ACK / NACK feedback in an arbitrary slot in any UE is determined by a PUCCH resource set determined by UCI payload size and ARI of DL assignment DCI. It can be defined as a PUCCH opportunity set corresponding to the PUCCH resource index. That is, the corresponding ARI may be interpreted as PUCCH opportunity set index indication information.

In addition, a PUCCH opportunity set for any UE is configured in the form of all combinations for each of the above-described Embodiments 1-1 to 1-4, and the PUCCH to be used for HARQ ACK / NACK feedback in any slot by the corresponding UE. All cases in which the base station indicates an opportunity set are determined may be included in the scope of the present disclosure.

Accordingly, it is possible to provide a specific method and apparatus capable of allocating resources for an uplink control channel (PUCCH) in an unlicensed band.

Hereinafter, when a radio resource for transmitting UCI is allocated according to the PUCCH resource allocation method described above, a UCI multiplexing method considering a PUSCH transmission resource allocation scenario will be proposed.

As described above with reference to FIG. 13, when resource allocation is performed in units of subbands, different PUSCH resources may be allocated to a certain UE through a plurality of subbands defined within one BWP in one slot. . For example, to transmit the same transmission block (TB) for each HARQ process, to increase the probability of LBT success for the PUSCH transmission in the corresponding UE through PUSCH transmission resource allocation through a plurality of subbands. Can be defined Alternatively, PUSCH transmission resource allocation is performed through a plurality of subbands for a plurality of TB transmissions based on a plurality of different HARQ processes, similar to multi-subframe scheduling in a time-domain. Can be. Alternatively, PUSCH transmission resources through a plurality of subbands may be allocated for wideband transmission for a single TB.

Example 2-1. Subband-based UCI multiplexing

PUCCH transmission and UL transmission channel (UL-SCH) for UCI reporting, such as HARQ-ACK information, CSI or SR, for any UE in any one slot of an NR unlicensed band (NR-U) cell If a PUSCH transmission resource including or not overlapping is overlapped in a time period, the UE may multiplex the corresponding UCI to the PUSCH transmission resource and transmit the same.

However, as described above, one or more subbands for uplink transmission may be defined for UL BWP for any UE in NR-U. In addition, when a PUSCH transmission resource is allocated in any subband, whether or not the UE transmits the allocated PUSCH may be determined according to the LBT result of the corresponding subband.

As described above, in the case of the NR-U cell, a UL BWP for any UE may be configured with one or more subbands, and PUSCH transmission may be indicated through a plurality of subbands in any slot for the UE. As described above, when a PUSCH transmission is indicated through a plurality of subbands for a specific UE, and when the corresponding PUSCH transmission is indicated through a UL grant DCI, the UE is one PUSCH among PUSCHs through a plurality of subbands. Only UCI can be defined to be multiplexed and transmitted.

For example, the UE determines one subband to multiplex UCI among PUSCH transmission resources allocated through a plurality of allocated subbands, and multiplexes the UCI only for PUSCH resources transmitted through the subband. can do. Specifically, the UL BWP for any terminal is divided into N subbands from sub-band # 0 to sub-band # (N-1), and any M subbands of the N subbands (M < Assume that M PUSCH resources are allocated through = N). In this case, the UE may be defined to determine one subband for UCI transmission and a PUSCH transmission resource in the corresponding subband.

According to an example, in order to determine the corresponding one subband, the base station may define the corresponding subband and signal it to the terminal. The subband indication information for the UCI multiplexing may be ID or index indication information of the corresponding subband, and is transmitted to the UE through L1 control signaling, which is a DCI transmitted by the base station through RRC signaling, MAC CE signaling, or PDCCH. Can be.

However, when the LBT for the corresponding subband fails, the UE may define not to transmit the UCI by multiplexing the PUCI resource. Alternatively, the terminal may be defined to be transmitted by multiplexing on the PUSCH of the subband of the next index according to an increasing order. Alternatively, the UE may be defined to transmit separately through the PUCCH resource allocated for the UCI without multiplexing on the PUSCH resource.

According to another example, to determine the corresponding subband, the subband for multiplexing the corresponding UCI may be defined to be determined implicitly. As an example for this purpose, the UE may define to multiplex and transmit the UCI through the PUSCH of the subband of the lowest index among the subbands to which the allocated PUSCH transmission resources are allocated.

However, when the LBT for the corresponding subband fails, the UE may define not to transmit the UCI by multiplexing the PUCI resource. Alternatively, the terminal may be defined to be transmitted by multiplexing on the PUSCH of the subband of the next index according to an increasing order. Alternatively, the UE may be defined to transmit separately through the PUCCH resource allocated for the UCI without multiplexing on the PUSCH resource. Alternatively, the terminal may be defined to transmit through the subband of the lowest index among the subbands that succeeded in LBT.

As another example, it may be defined to be transmitted by multiplexing through a PUSCH of a subband having the same index as a subband in which PUCCH resource allocation is performed for UCI transmission of a corresponding UE. However, when a plurality of subbands are allocated for transmission of the corresponding PUCCH, it may be defined to multiplex the corresponding UCI through the PUSCH of the subband of the lowest index to which the PUSCH is allocated among the subbands.

As another example, the corresponding subband determination may be defined to determine by applying the above-described implicit method in a subband in which LBT succeeds among PUSCH or PUCCH allocation subbands.

As such, when transmitting through a PUSCH resource of one subband, the resource for UCI multiplexing may be defined to be determined by the PUSCH resource allocation amount of the corresponding subband and the β _offset value for each UCI type described above. In addition, the corresponding β _offset value may also be set separately for each subband, and the base station may define that the β _offset value for each subband is transmitted to the corresponding UE through DCI, which is an RRC signaling or an L1 control signaling.

Example 2-2. Multiplexing the same UCI repeatedly over all subbands transmitted by PUSCH

PUCCH transmission for UCI reporting such as HARQ-ACK information, CSI or SR, and PUSCH transmission including UL-SCH (or not including UL-SCH) for any terminal in any one slot of NR-U cell If resources overlap in a time period, the UE may transmit the multiplexing of the UCI to the PUSCH transmission resource.

However, as described above, one or more sub-bands for uplink transmission may be defined for UL BWP for any UE in NR-U. In addition, when a PUSCH transmission resource is allocated in a certain sub-band, whether or not the PUSCH is transmitted may be determined according to the LBT result of the sub-band based on the UE.

As described above, in the case of the NR-U cell, a UL BWP for any UE may be configured with one or more sub-bands, and PUSCH transmission may be indicated through a plurality of sub-bands in any slot for the UE. As described above, when a PUSCH transmission is indicated through a plurality of sub-bands for a specific UE, and when the corresponding PUSCH transmission is indicated through a UL grant DCI, the UE performs UCI on all PUSCH transmission resources through a plurality of subbands. Multiplexing can be defined to send.

That is, it may be defined to multiplex the same UCI to be reported by the UE to all PUSCH transmission resources allocated to each subband. In this case, the resource to be used for UCI multiplexing among the PUSCH transmission resources allocated to each subband may be defined to be determined by the PUSCH resource allocation amount for each subband and the β _offset value for each UCI type described above. At this time, the β _offset value can also be set separately for each subband to be defined by the respective sub-band specific _offset value β is RRC signaling or L1 or the control signaling, DCI by the base station to be transmitted to the terminal.

Example 2-3. Multiplex UCI over one or more subbands

Similar to the above-described embodiment 2-1, when M subbands to which PUSCH resource allocation is performed among the N subbands in total, M may be defined such that UCI multiplexing is performed through any one or more of K subbands. have. The K subbands may be indicated by the base station to the corresponding terminal through RRC signaling, MAC CE signaling, or L1 control signaling. In this case, it may be indicated in the form of a bitmap for each N subbands configuring the corresponding UL BWP.

Alternatively, the K subbands may be defined to be determined as subbands having the same index as the subbands for which PUCCH resource allocation for UCI transmission is performed among M subbands for which PUSCH resource allocation is performed. In this case, the resource to be used for UCI multiplexing among the PUSCH transmission resources allocated to each subband may be defined to be determined by the PUSCH resource allocation amount for each subband and the β _offset value for each UCI type described above. At this time, the β _offset value can also be set separately for each subband to be defined by the respective sub-band specific _offset value β is RRC signaling or L1 or the control signaling, DCI by the base station to be transmitted to the terminal.

Example 2-4. Slot-based PUSCH Transmission-Based UCI Multiplexing

When a PUSCH transmission resource through a plurality of subbands is allocated in an arbitrary slot, UCI multiplexing may be defined based on the total PUSCH transmission resource of the corresponding slot. That is, as described above, it is assumed that a terminal to which PUSCH transmission resources are allocated over M subbands in UL BWP having N subband configurations. In this case, in the method of multiplexing and transmitting UCI to a PUSCH, it may be defined to perform UCI multiplexing based on M PUSCH transmission resources allocated in a corresponding slot.

In this case, the resource allocation amount for the UCI multiplexing may be defined to be determined by the total resource allocation amount of the PUSCH allocated through M subbands in the corresponding slot and the β _offset value for each UCI type described above. In this case, a single value may be set regardless of the β _offset subband and may be defined to be transmitted by the base station to the corresponding terminal through DCI which is RRC signaling or L1 control signaling.

Additionally, in the form of all combinations of UCI multiplexing schemes for each of the above-described embodiments 2-1 to 2-4, all cases where UCI multiplexing via PUSCH in an NR-U cell is applied are included in the scope of the present disclosure. do. In addition, different UCI multiplexing schemes may be applied to the above-described PUSCH transmission scenarios. In this case, the UCI multiplexing method may be set by a base station and transmitted to a corresponding UE through RRC signaling, MAC CE signaling, or L1 control signaling, or PUSCH transmission. Each scenario can be determined implicitly.

Accordingly, a piggyback method and apparatus capable of transmitting and receiving multiplexing uplink control information on an uplink data channel (PUSCH) in an unlicensed band can be provided.

Hereinafter, configurations of a terminal and a base station capable of performing some or all of the embodiments described with reference to FIGS. 1 to 16 will be described with reference to the drawings.

17 is a diagram illustrating a configuration of a user terminal 1700 according to another embodiment.

Referring to FIG. 17, a user terminal 1700 according to another embodiment includes a controller 1710, a transmitter 1720, and a receiver 1730.

The controller 1710 controls the overall operation of the user terminal 1700 according to the method for transmitting uplink control information in the unlicensed band required for performing the above-described disclosure. The transmitter 1720 transmits uplink control information, data, and a message to a base station through a corresponding channel. The receiver 1730 receives downlink control information, data, and a message from a base station through a corresponding channel.

The receiver 1730 may receive first radio resource information for at least one subband allocated for transmission of an uplink data channel, from among a plurality of subbands for the bandwidth part configured in the unlicensed band. When resource allocation is performed in units of subbands, the receiver 1730 receives first radio resource information, which is information on PUSCH resources allocated through a plurality of subbands for a BWP configured in an unlicensed band in one slot, from a base station can do.

The receiver 1730 may receive second radio resource information allocated for transmission of uplink control information. Apart from the reception of the first radio resource information, the UE may receive second radio resource information on PUCCH resources for UCI reporting such as HARQ-ACK information, CSI or SR in one slot.

When the second radio resource allocated to the transmission of the uplink control information is indicated in the same slot as the first radio resource allocated to the transmission of the uplink data channel, the controller 1710 transmits the uplink control information to the uplink data channel. You can multiplex. The transmitter 1720 may transmit the uplink data channel multiplexed with uplink control information. That is, in the unlicensed band, when the PUCCH resource for the UCI transmission such as HARQ-ACK information and the PUSCH transmission resource overlap in the same slot, the transmitter 1720 may transmit the PUSCH multiplexed by the UCI to the base station.

According to an embodiment, the controller 1710 may determine one subband to multiplex UCI among the PUSCH transmission resources through the allocated plurality of subbands. The controller 1710 may multiplex UCI only for PUSCH resources transmitted through the determined subband.

According to an example, in order to determine one subband for multiplexing UCI, the receiver 1730 may receive information indicating a subband determined by the base station from the base station. The subband indication information for multiplexing of UCI may be index indication information of the determined subband. The receiver 1730 may receive the subband indication information from the base station through DCI, which is RRC signaling, MAC CE signaling, or L1 control signaling.

Alternatively, according to another example, a subband for multiplexing UCI may be determined implicitly. For example, the controller 1710 may multiplex UCI through a PUSCH of a subband corresponding to a lowest index among a plurality of subbands to which PUSCH transmission resources are allocated.

According to another example, the controller 1710 may multiplex UCI through a PUSCH of a subband having the same index as a subband in which PUCCH resource allocation is performed for UCI transmission. If a plurality of subbands are allocated for PUCCH transmission, the controller 1710 may multiplex UCI through the PUSCH of the lowest index subband to which the PUSCH is allocated among the subbands to which the PUCCH resource is allocated.

According to another example, the controller 1710 may determine a subband for multiplexing the UCI as a subband of the lowest index within a subband in which LBT succeeds among the PUSCH or PUCCH allocation subbands.

According to another exemplary embodiment, when M subbands are allocated to PUSCH transmission among the N subbands constituting the UL BWP, the controller 1710 may determine a PUSCH transmission resource within K subbands determined from the M subbands. UCI can be multiplexed. In this case, M may be one or more natural numbers, and K may be one or more natural numbers. That is, when K is equal to M, the UE may repeatedly multiplex the same UCI through all subbands allocated for PUSCH transmission.

Alternatively, when K is smaller than M, the controller 1710 may multiplex the UCI through one or more subbands. For example, when the number of subbands to which PUSCH resource allocation is performed among the N subbands is M, the controller 1710 may perform UCI multiplexing through one or more arbitrary K subbands. In this case, the receiver 1730 may receive information on the K subbands from the base station through RRC signaling, MAC CE signaling, or L1 control signaling. In this case, the information on the K subbands may be indicated in the form of a bitmap for each N subbands constituting the corresponding UL BWP.

Alternatively, the K subbands may be determined as subbands having the same index as the subband where the PUCCH resource allocation for UCI transmission is performed among the M subbands for which the corresponding PUSCH resource allocation is performed.

According to another embodiment, the controller 1710 may perform PUSCH transmission based UCI multiplexing on a slot basis. When a PUSCH transmission resource through a plurality of subbands is allocated in an arbitrary slot, the controller 1710 may perform UCI multiplexing based on all PUSCH transmission resources of the corresponding slot.

Accordingly, a piggyback method and apparatus capable of transmitting and receiving multiplexing uplink control information on an uplink data channel (PUSCH) in an unlicensed band can be provided.

18 is a diagram illustrating a configuration of a base station 1800 according to another embodiment.

Referring to FIG. 18, a base station 1800 according to another embodiment includes a controller 1810, a transmitter 1820, and a receiver 1830.

The controller 1810 controls the overall operation of the base station 1800 according to the method for receiving uplink control information in the unlicensed band required to perform the above-described present disclosure. The transmitter 1820 and the receiver 1830 are used to transmit and receive a signal, a message, and data necessary for carrying out the present disclosure.

 The transmitter 1820 may transmit first radio resource information for at least one subband allocated to transmission of an uplink data channel, from among a plurality of subbands for the bandwidth part configured in the unlicensed band. When resource allocation is performed in units of subbands, the transmitter 1820 transmits first radio resource information, that is, information on PUSCH resources allocated through a plurality of subbands for a BWP configured in an unlicensed band in one slot, to a terminal. Can be.

 The transmitter 1820 may transmit second radio resource information allocated for transmission of uplink control information. Apart from receiving the first radio resource information, the transmitter 1820 may transmit the second radio resource information on the PUCCH resource for the UCI report such as HARQ-ACK information, CSI or SR in one slot to the terminal.

 When the second radio resource allocated to the transmission of the uplink control information is indicated in the same slot as the first radio resource allocated to the transmission of the uplink data channel, the receiving unit 1830 is uplink data multiplexed with the uplink control information. A channel can be received. In the unlicensed band, when a PUCCH resource for UCI transmission such as HARQ-ACK information and a PUSCH transmission resource overlap with respect to the same slot, the receiver 1830 may receive a PUSCH multiplexed with UCI from a terminal.

According to an embodiment, the terminal may determine one subband to multiplex UCI among the PUSCH transmission resources through the allocated plurality of subbands. The receiver 1830 may receive the UCI multiplexed with respect to the PUSCH resource transmitted through the subband determined by the terminal.

According to an example, the transmitter 1820 may transmit information indicating one subband for multiplexing the UCI to the terminal. The subband indication information for the multiplexing of the UCI may be index indication information of the subband. The transmitter 1820 may transmit the subband indication information to the terminal through DCI, which is RRC signaling, MAC CE signaling, or L1 control signaling. The terminal may determine one subband for multiplexing the UCI according to the subband indication information.

Alternatively, according to another example, a subband for multiplexing UCI may be determined implicitly. For example, the UE may multiplex and transmit the UCI through the PUSCH of the subband corresponding to the lowest index among the plurality of subbands to which the PUSCH transmission resource is allocated.

According to another example, the receiver 1830 may receive the multiplexed UCI through the PUSCH of the subband of the same index as the subband where the PUCCH resource allocation is made for UCI transmission. If a plurality of subbands are allocated for PUCCH transmission, the receiver 1830 may receive UCI multiplexed through the PUSCH of the lowest index subband to which the PUSCH is allocated among the subbands to which the PUCCH resource is allocated. .

According to another example, a subband for multiplexing UCI may be determined as a subband of the lowest index within a subband in which LBT succeeds among the PUSCH or PUCCH allocation subbands.

According to another embodiment, when M subbands are allocated to PUSCH transmission among N subbands constituting UL BWP, the UE multiplexes UCI to PUSCH transmission resources in K subbands determined among M subbands. can do. In this case, M may be one or more natural numbers, and K may be one or more natural numbers. That is, when K is equal to M, the UE may repeatedly multiplex the same UCI through all subbands allocated for PUSCH transmission. The receiver 1830 may receive the same UCI multiplexed on all PUSCH transmission resources allocated to each subband.

Alternatively, when K is smaller than M, the terminal may transmit the multiplexed UCI through one or more subbands. For example, when M subbands in which PUSCH resource allocation is performed among all N subbands are M, the UE may perform UCI multiplexing through one or more arbitrary K subbands. In this case, the transmitter 1820 may transmit information on the K subbands to the terminal through RRC signaling, MAC CE signaling, or L1 control signaling. In this case, the information on the K subbands may be indicated in the form of a bitmap for each N subbands constituting the corresponding UL BWP.

Alternatively, the K subbands may be determined as subbands having the same index as the subband where the PUCCH resource allocation for UCI transmission is performed among the M subbands for which the corresponding PUSCH resource allocation is performed.

According to another embodiment, the receiver 1830 may receive a UCI multiplexed based on a PUSCH transmission on a slot basis. When a PUSCH transmission resource through a plurality of subbands is allocated in an arbitrary slot, the UE may perform UCI multiplexing based on all PUSCH transmission resources of the corresponding slot.

Accordingly, a piggyback method and apparatus capable of transmitting and receiving multiplexing uplink control information on an uplink data channel (PUSCH) in an unlicensed band can be provided.

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.

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 scope of protection of the present disclosure should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto shall be construed as being included in the scope of the present disclosure.

Claims (20)

In the method for the terminal to transmit the uplink control information in the unlicensed band,
Receiving first radio resource information for at least one subband allocated for transmission of a physical uplink shared channel (PUSCH) among a plurality of subbands for a bandwidth part configured in an unlicensed band;
Receiving second radio resource information allocated for transmission of uplink control information (UCI);
When the second radio resource allocated to the transmission of the uplink control information is indicated in the same slot as the first radio resource allocated to the transmission of the uplink data channel, multiplexing the uplink control information to the uplink data channel multiplexing; And
And transmitting the uplink data channel multiplexed with the uplink control information. The method of claim 1,
The uplink control information is,
And multiplexing the uplink data channel in one subband determined from the at least one subband. The method of claim 2,
The determined one subband is,
A method indicated by higher base station signaling by a base station or through downlink control information (DCI). The method of claim 2,
The determined one subband is,
And determined based on index information indicative of each of the at least one subband. The method of claim 1,
The at least one subband is composed of M subbands,
The uplink control information is multiplexed on the uplink data channels in the K subbands determined among the at least one subbands, respectively.
Wherein M is at least one natural number and K is at least 1 and no more than M. In the method for the base station to receive the uplink control information in the unlicensed band,
Transmitting first radio resource information on at least one subband allocated to transmission of a physical uplink shared channel (PUSCH) among a plurality of subbands for a bandwidth part configured in an unlicensed band;
Transmitting second radio resource information allocated for transmission of uplink control information (UCI); And
If the second radio resource allocated to the transmission of the uplink control information is indicated in the same slot as the first radio resource allocated to the transmission of the uplink data channel, the uplink data channel multiplexed with the uplink control information Receiving a step. The method of claim 6,
The uplink control information is,
And multiplexing the uplink data channel in one subband determined from the at least one subband. The method of claim 7, wherein
The determined one subband is,
A method indicated by higher base station signaling by a base station or through downlink control information (DCI). The method of claim 7, wherein
The determined one subband is,
And determined based on index information indicative of each of the at least one subband. The method of claim 6,
The at least one subband is composed of M subbands,
The uplink control information is multiplexed on the uplink data channels in the K subbands determined among the at least one subbands, respectively.
Wherein M is at least one natural number and K is at least 1 and no more than M. A terminal for transmitting uplink control information in an unlicensed band,
Receiving first radio resource information for at least one subband allocated to transmission of an uplink data channel (PUSCH) among a plurality of subbands for a bandwidth part configured in an unlicensed band, and receiving uplink A receiver configured to receive second radio resource information allocated for transmission of uplink control information (UCI);
When the second radio resource allocated to the transmission of the uplink control information is indicated in the same slot as the first radio resource allocated to the transmission of the uplink data channel, multiplexing the uplink control information to the uplink data channel a control unit for multiplexing; And
And a transmitter for transmitting the uplink data channel multiplexed with the uplink control information. The method of claim 11,
The uplink control information is,
And a terminal multiplexed on the uplink data channel in one subband determined among the at least one subband. The method of claim 12,
The determined one subband is,
A UE indicated by higher layer signaling by a base station or indicated by downlink control information (DCI). The method of claim 12,
The determined one subband is,
The terminal is determined based on the index information indicating each of the at least one subband. The method of claim 11,
The at least one subband is composed of M subbands,
The uplink control information is multiplexed on the uplink data channels in the K subbands determined among the at least one subbands, respectively.
M is a natural number of 1 or more, and K is a natural number of 1 or more and less than M. A base station receiving uplink control information in an unlicensed band,
Among the plurality of subbands for the bandwidth part configured in the unlicensed band, transmit first radio resource information for at least one subband allocated to transmission of an uplink shared channel (PUSCH), and uplink A transmitter for transmitting second radio resource information allocated for transmission of uplink control information (UCI); And
If the second radio resource allocated to the transmission of the uplink control information is indicated in the same slot as the first radio resource allocated to the transmission of the uplink data channel, the uplink data channel multiplexed with the uplink control information A base station comprising a receiving unit for receiving. The method of claim 16,
The uplink control information is,
And a base station multiplexed on the uplink data channel in one subband determined among the at least one subband. The method of claim 17,
The determined one subband is,
A base station indicated by higher layer signaling by a base station or indicated through downlink control information (DCI). The method of claim 17,
The determined one subband is,
And a base station determined based on index information representing each of the at least one subband. The method of claim 16,
The at least one subband is composed of M subbands,
The uplink control information is multiplexed on the uplink data channels in the K subbands determined among the at least one subbands, respectively.
M is a natural number of 1 or more, and K is a natural number of 1 or more and M or less.

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