KR102360185B1 - Method and apparatus for transmitting uplink channel in unlicensed band - Google Patents

Abstract

The present embodiments relate to a method and an apparatus for transmitting an uplink channel in an unlicensed band, and an embodiment is a method for a terminal to transmit an uplink channel in an unlicensed band, SubCarrier Spacing (SCS) of an unlicensed band ) provides a method comprising the steps of configuring an interlace for an uplink channel based on interlacing information that is divided and determined according to, and transmitting the uplink channel by applying the interlace.

Description

Method and apparatus for transmitting an uplink channel in an unlicensed band {METHOD AND APPARATUS FOR TRANSMITTING UPLINK CHANNEL IN UNLICENSED BAND}

The present embodiments propose a method and apparatus for transmitting an uplink channel in an unlicensed band in a next-generation radio access network (hereinafter referred to as "New Radio [NR]").

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

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

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

As a part of this aspect, a design for interlacing applicable to the case of transmitting an uplink channel using an unlicensed band in NR is required.

Embodiments of the present disclosure may provide a specific method and apparatus capable of transmitting an uplink channel based on interlacing information determined according to subcarrier spacing in an unlicensed band.

In addition, embodiments of the present disclosure may provide a specific method and apparatus capable of instructing resource allocation in units of subbands in an unlicensed band.

In one aspect, the present embodiments provide a method for a terminal to transmit an uplink channel in an unlicensed band, based on interlacing information that is divided and determined according to subcarrier spacing (SCS) of the unlicensed band. It is possible to provide a method comprising the steps of configuring an interlace for an uplink channel and transmitting the uplink channel by applying the interlace.

In another aspect, the present embodiments provide a method for a base station to receive an uplink channel in an unlicensed band, the step of receiving an uplink channel to which an interlace is applied in an unlicensed band and an uplink channel based on interlacing information on the interlace A method may be provided that includes obtaining the contained information.

In another aspect, the present embodiments, in a terminal transmitting an uplink channel in an unlicensed band, uplink based on interlacing information that is divided and determined according to subcarrier spacing (SCS) of the unlicensed band It is possible to provide a terminal including a controller for configuring an interlace for a link channel and a transmitter for transmitting an uplink channel by applying the interlace.

In another aspect, the present embodiments, in a base station for receiving an uplink channel in an unlicensed band, include a receiver for receiving an uplink channel to which interlace is applied in an unlicensed band and an uplink channel based on interlacing information on the interlace It is possible to provide a base station including a control unit for obtaining the specified information.

According to the present embodiments, it is possible to provide a specific method and apparatus capable of transmitting an uplink channel based on interlacing information determined according to subcarrier spacing in an unlicensed band.

In addition, according to the present embodiments, it is possible to provide a specific method and apparatus for instructing resource allocation in subband units in an unlicensed band.

1 is a diagram schematically illustrating a structure of an NR wireless communication system to which this embodiment can be applied.
2 is a diagram for explaining a frame structure in an NR system to which this embodiment can be applied.
3 is a diagram for explaining a resource grid supported by a radio access technology to which this embodiment can be applied.
4 is a diagram for explaining a bandwidth part supported by a radio access technology to which the present embodiment can be applied.
5 is a diagram exemplarily illustrating a synchronization signal block in a radio access technology to which the present embodiment can be applied.
6 is a diagram for explaining a random access procedure in a radio access technology to which this embodiment can be applied.
7 is a diagram for explaining CORESET.
8 is a diagram illustrating an example of symbol level alignment in different SCSs to which this embodiment can be applied.
9 is a diagram for explaining an NR time domain structure according to subcarrier spacing to which this embodiment can be applied.
10 is a diagram for explaining an NR PSS/SS/PBCH block to which this embodiment can be applied.
11 is a diagram for explaining an SSB burst periodicity to which the present embodiment can be applied.
12 is a diagram illustrating a procedure in which a terminal transmits an uplink channel in an unlicensed band according to an embodiment.
13 is a diagram illustrating a procedure for a base station to receive an uplink channel in an unlicensed band according to an embodiment.
14 is a diagram for explaining application of a different interlacing pattern for each subband to which the present embodiment can be applied.
15 and 16 are diagrams for explaining an interlacing pattern with a predetermined interval with residual PRBs to which the present embodiment can be applied.
17 is a diagram showing the configuration of a base station according to another embodiment.
18 is a diagram showing the configuration of a user terminal according to another embodiment.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

<Normal NR system>

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

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

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

<NR Waveform, Pneumologic and Frame Structure>

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

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

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

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

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

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

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

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

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

<NR Physical Resources>

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

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

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

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

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

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

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

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

<NR Initial Connection>

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

<NR CORESET>

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

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

7 is a diagram for explaining CORESET.

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

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

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

5G NR (New Rat)

3GPP supports a multiple subcarrier-based frame structure in relation to the NR frame structure. In this regard, the basic subcarrier spacing (SubCarrier Spacing; SCS) is 15 kHz, and a total of 5 types of SCS in the form of multiplying 15 kHz by 2 ^μ are supported. The SCS values according to μ values are shown in Table 1 above.

Referring to FIG. 8 , the length of the slot varies according to numerology. That is, it can be seen that the SCS increases as the length of the slot becomes shorter. In addition, a slot defined in NR is defined based on 14 OFDM symbols.

NR supports the following time domain structure on the time axis. Unlike conventional LTE, in NR, the basic scheduling unit is changed to a slot. Also, referring to FIG. 9 , in NR, a slot consists of 14 OFDM symbols regardless of subcarrier-spacing. In addition, NR also supports a non-slot structure composed of 2, 4, 7 OFDM symbols that are smaller scheduling units. A non-slot structure may be utilized as a scheduling unit for a URLLC service.

The radio frame is set to 10 ms regardless of the pneumatology. A subframe is set to 1 ms as a reference for a time duration. In NR, a subframe is not used as a data/control scheduling unit. The slot is mainly used in eMBB and includes 14 OFDM symbols. A non-slot, such as a mini-slot, is mainly used in URLLC, but is not limited to URLLC, and includes 2, 4 or 7 OFDM symbols. The TTI duration is a time duration for data/control channel transmission, and is set to a number of OFDM symbols per slot/non-slot.

Wider bandwidth operations

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

However, in the case of NR, the design is made to enable support for NR terminals having different transmission/reception bandwidth capabilities through one wideband NR CC, and accordingly, any NR CC By configuring one or more bandwidth parts (BWP) composed of a segmented bandwidth for operation) is required.

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

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

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

NR-U

In the case of an unlicensed band, unlike a licensed band, it is not a radio channel that can be used exclusively by any operator, but can be used by any operator or individual within the regulation of each country to provide a wireless communication service. Accordingly, when providing NR services through unlicensed bands, the problem of co-existence with various short-range wireless communication protocols such as WiFi, Bluetooth, NFC, etc. A solution to the co-existence problem is needed.

Accordingly, when providing the NR service through the unlicensed band, the power level of the radio channel or carrier to be used before transmitting the radio signal to avoid interference or collision between the respective radio communication services is sensed by sensing the radio There is a need to support a Listen Before Talk (LBT)-based radio channel access method for determining whether a channel or a carrier can be used. In this case, if a specific radio channel or carrier in the unlicensed band is in use by another radio communication protocol or another operator, there is a possibility that the provision of NR service through the band may be restricted. Unlike wireless communication services through

In particular, in the case of NR-U, unlike the existing LTE that supported unlicensed spectrum through carrier aggregation (CA) with licensed spectrum, the deployment scenario of unlicensed band NR Because a stand-alone NR-U cell or a DC (Dual Connectivity)-based NR-U cell with an NR cell or LTE cell of a licensed band is considered as a (deployment scenario) unlicensed band It is necessary to design a data transmission/reception method to satisfy the minimum QoS by itself.

NR SSB

Referring to FIG. 10, NR SSB (Synchronization Signal Block) can be transmitted in various subcarrier spacings, unlike LTE, and is always transmitted together with PBCH. In addition, a minimum required transmission band is defined for each subcarrier spacing as follows.

Below 6 GHz, it is defined as 15 kHz SCS and 5 MHz except for some specific bands such as bands n41, n77 and n78 with 30 kHz SCS and 10 MHz. Above 6 GHz, it is defined as 120 kHz SCS and 10 MHz.

In addition, subcarrier spacing supported for each frequency band is different. Below 1 GHz, SCS of 15 kHz, 30 kHz, and 60 kHz is supported. For the bands between 1 GHz and 6 GHz, SCS of 15 kHz, 30 kHz and 60 kHz is supported. SCS of 60 kHz and 120 kHz is supported in the above 24GHz and below 52.6GHz. Also, 240 kHz is not applied to data.

Referring to FIG. 11 , the SSB is defined and transmitted as an SSB burst set rather than a single type. Basically, the SSB burst set is 5 ms regardless of numerology, and the maximum number L of SSB blocks that can be transmitted in the set is as follows.

For frequency ranges up to 3 GHz, L is set to 4. For the frequency range from 3 GHz to 6 GHz, L is set to 8. For the frequency range from 6 GHz to 52.6 GHz, L is set to 64.

In addition, the period at which the defined SSB burst set is transmitted is additionally set as RRC and indicated to the UE. A terminal performing initial access assumes a 20 ms cycle as a default and performs system information update after motion acquisition. Thereafter, the SSB burst period value is finally updated by the base station.

In NR-U, a stand-alone design for an unlicensed band is being considered. In addition, in order to increase the LBT success probability, a multi-bandwidth part (Bandwidth Part; BWP) or subband (subband) scheduling is considered. Accordingly, it may be necessary to design an interlacing pattern applicable to transmission of an uplink channel.

Hereinafter, a method of transmitting an uplink channel to which interlacing is applied in an unlicensed band will be specifically described with reference to related drawings.

12 is a diagram illustrating a procedure in which a terminal transmits an uplink channel in an unlicensed band according to an embodiment.

Referring to FIG. 12, the UE may configure an interlace for an uplink channel based on interlacing information that is divided and determined according to subcarrier spacing (SCS) of an unlicensed band (interlace). S1200).

According to an example, in order for the terminal to transmit the uplink channel in the unlicensed band, an interlace for the uplink channel may be configured. An interlacing interval in units of PRBs may be set in the interlace, and each interlace may be repeatedly configured according to the interlacing interval.

According to an example, the interlacing information for the interlacing pattern may be divided and determined according to the subcarrier spacing of the unlicensed band. In this case, in resource allocation for each subband constituting the bandwidth, an interlacing pattern for each subband may be set. Hereinafter, the subband will be described on the premise, but the present invention is not limited thereto, and the same can be applied substantially to multiple BWPs. In addition, although the uplink is described on the premise, the same can be applied substantially to the downlink.

According to an example, subbands used for transmission of an uplink channel may be configured with different bandwidths, and interlacing may be applied differently for each subband. In this case, values for the size of the subband may be considered in setting the interlacing pattern. When defining an interlacing pattern for each subband, the size of the subband or the number of PRBs in the subband may be used.

When the size of the subband is fixed, the interlacing unit may be set differently according to the subcarrier spacing of the subband. For example, it is assumed that the bandwidth of the subband is 20 MHz. When the SCS of the subband is 15 kHz, 30 kHz, and 60 kHz, respectively, the number of PRBs of the subband according to each SCS is 100, 50, and 25, respectively.

In this case, since the number of PRBs defined for each SCS is different, the interlacing interval and interlacing unit included in the interlacing information may be configured accordingly. For example, when the SCS is 15 kHz, 10 interlaces, which are interlacing units, may be configured according to an interval of 10 PRBs. When the SCS is 30 kHz, according to an interval of 10 PRBs, 5 interlaces may be configured. That is, variable interlacing information according to the SCS of the subband may be configured.

According to an example, the interlacing information may be directly signaled through DCI. For example, when the UE detects a corresponding PDCCH, the interlacing field, which is a DCI field included in the corresponding grant, may indicate an interlacing unit such as Subband#0: 0, Subband#1: 1, etc. have. That is, if the value of the interlacing field is '0', it is assumed that a 10 RB interval is indicated, and if the value of the interlacing field is '1', it is assumed that a 5 RB interval is indicated. In this case, an interlacing unit may be configured for subband subband#0 in units of 10 PRBs, and an interlacing unit may be configured for subband subband#1 in units of 5 PRBs.

According to another example, the interlacing information may be directly signaled through RRC signaling. Interlacing pattern values for multiple subbands may be indicated through single RRC signaling, and a specific method may be applied substantially the same as the method using DCI.

According to another example, the interlacing information may be determined as a value dependent on the size of a subband or BWP. In this case, unlike the above-described example using DCI or RRC signaling, there is no need for separate signaling to indicate the interlacing unit to the UE. That is, the interlacing unit may be determined by a predefined method through a value defined during subband division.

In this case, the interlacing unit may be determined with a predefined size according to the size of the initially divided subband. When the size of the bandwidth for each subband is determined at the time of initial subband setting, an interlacing interval satisfying the corresponding range is determined accordingly, and basic interlacing units may also be determined according to the interlacing interval. . For example, when the bandwidth of the subband is determined to be 20 MHz, since the interlacing interval is determined at 10 PRB intervals, each interlacing unit is determined at 10 PRB intervals for all 100 PRBs, so the number of interlacing units is 10 dog can be determined.

According to another example, the interlacing unit may be determined according to the size of the resource allocation field in DCI. In this case, the size of the resource allocation field may be used in performing interlacing. For example, if the number of bits for resource allocation is limited to 'N_RA', an interlacing pattern may be determined accordingly. For example, when N_RA is 10 bits and SCS is 15 kHz, it is assumed that bitmap-based resource allocation is applied. In the case of a subband having a bandwidth of 20 MHz, the interlacing interval is 10 PRBs, and since the number of interlacing units in which the actual resource allocation is made is 10, the resource allocation may be performed with 10 bits of N_RA. On the other hand, if the interlacing interval is 5 PRB, the number of interlacing units becomes 20, so that 20 bits are required for N_RA. Therefore, since it exceeds the previously determined 10-bit resource allocation field, interlacing with an interval of 5 PRBs cannot be applied in the corresponding subband.

If the bandwidth is 10 MHz, since all 50 PRBs are distributed so as to have an interval of 5 units, 10 interlacing units are generated, so that the N_RA resource can be allocated with 10 bits.

The terminal may perform interlacing for the uplink channel based on the interlacing information.

Again, referring to FIG. 12, the terminal may transmit an uplink channel by applying interlace (S1210).

Accordingly, it is possible to provide a specific method and apparatus capable of transmitting an uplink channel based on interlacing information determined according to subcarrier spacing in an unlicensed band.

13 is a diagram illustrating a procedure for a base station to receive an uplink channel in an unlicensed band according to an embodiment.

Referring to FIG. 13 , the base station may receive an uplink channel to which interlace is applied in an unlicensed band ( S1200 ).

Again, referring to FIG. 13 , the base station may acquire information included in an uplink channel based on interlacing information on the interlace ( S1210 ).

According to an example, the base station may receive an uplink channel to which the interlace configured in the terminal is applied. An interlacing interval in units of PRBs may be set in the interlace, and each interlace may be repeatedly configured according to the interlacing interval.

According to an example, the interlacing information for the interlacing pattern may be divided and determined according to the subcarrier spacing of the unlicensed band. In this case, in resource allocation for each subband constituting the bandwidth, an interlacing pattern for each subband may be set.

According to an example, subbands used for transmission of an uplink channel may be configured with different bandwidths, and interlacing may be applied differently for each subband. In this case, values for the size of the subband may be considered in setting the interlacing pattern. When defining an interlacing pattern for each subband, the size of the subband or the number of PRBs in the subband may be used.

When the size of the subband is fixed, the interlacing unit may be set differently according to the subcarrier spacing of the subband. For example, it is assumed that the bandwidth of the subband is 20 MHz. When the SCS of the subband is 15 kHz, 30 kHz, and 60 kHz, respectively, the number of PRBs of the subband according to each SCS is 100, 50, and 25, respectively.

In this case, since the number of PRBs defined for each SCS is different, the interlacing interval and interlacing unit included in the interlacing information may be configured accordingly. For example, when the SCS is 15 kHz, 10 interlaces, which are interlacing units, may be configured according to an interval of 10 PRBs. When the SCS is 30 kHz, according to an interval of 10 PRBs, 5 interlaces may be configured. That is, variable interlacing information according to the SCS of the subband may be configured.

According to an example, the base station may signal interlacing information directly through DCI. For example, when the UE detects a corresponding PDCCH, the interlacing field, which is a DCI field included in the corresponding grant, may indicate an interlacing unit such as Subband#0: 0, Subband#1: 1, etc. have. That is, if the value of the interlacing field is '0', it is assumed that a 10 RB interval is indicated, and if the value of the interlacing field is '1', it is assumed that a 5 RB interval is indicated. In this case, an interlacing unit may be configured for subband subband#0 in units of 10 PRBs, and an interlacing unit may be configured for subband subband#1 in units of 5 PRBs.

According to another example, the base station may directly signal interlacing information through RRC signaling. Interlacing pattern values for multiple subbands may be indicated through single RRC signaling, and a specific method may be applied substantially the same as the method using DCI.

According to another example, the interlacing information may be determined as a value dependent on the size of a subband or BWP. In this case, unlike the above-described example using DCI or RRC signaling, the base station does not need to perform separate signaling to indicate the interlacing unit to the terminal. That is, the interlacing unit may be determined by a predefined method through a value defined during subband division.

In this case, the interlacing unit may be determined with a predefined size according to the size of the initially divided subband. When the size of the bandwidth for each subband is determined at the time of initial subband setting, an interlacing interval satisfying the corresponding range is determined accordingly, and basic interlacing units may also be determined according to the interlacing interval. . For example, when the bandwidth of the subband is determined to be 20 MHz, since the interlacing interval is determined at 10 PRB intervals, each interlacing unit is determined at 10 PRB intervals for all 100 PRBs, so the number of interlacing units is 10 dog can be determined.

According to another example, the interlacing unit may be determined according to the size of the resource allocation field in the DCI transmitted by the base station. In this case, the size of the resource allocation field may be used in performing interlacing. For example, if the number of bits for resource allocation is limited to 'N_RA', an interlacing pattern may be determined accordingly. For example, when N_RA is 10 bits and SCS is 15 kHz, it is assumed that bitmap-based resource allocation is applied. In the case of a subband having a bandwidth of 20 MHz, the interlacing interval is 10 PRBs, and since the number of interlacing units in which the actual resource allocation is made is 10, the resource allocation may be performed with 10 bits of N_RA. On the other hand, if the interlacing interval is 5 PRB, the number of interlacing units becomes 20, so that 20 bits are required for N_RA. Therefore, since it exceeds the previously determined 10-bit resource allocation field, interlacing with an interval of 5 PRBs cannot be applied in the corresponding subband.

If the bandwidth is 10 MHz, since all 50 PRBs are distributed so as to have an interval of 5 units, 10 interlacing units are generated, so that the N_RA resource can be allocated with 10 bits.

The base station may obtain information from an uplink channel to which interlacing is applied, based on the interlacing information.

Accordingly, it is possible to provide a specific method and apparatus capable of receiving an uplink channel based on interlacing information determined according to subcarrier spacing in an unlicensed band.

Hereinafter, with reference to related drawings, each embodiment of transmitting an uplink channel to which interlacing is applied in an unlicensed band in NR will be described in detail.

In NR, a channel access procedure for unlicensed band access may be configured as follows. The LTE-LAA (License Assisted Access) channel access mechanism may be adopted as a reference for 5 GHz. The LTE-LAA channel access mechanism can be adopted as a starting point of design for 6GHz. For the 5GHz band, the no-LBT option is useful for NR-U, such as support for high-speed A/N feedback, and may be allowed by regulations. Restrictions or conditions when the no-LBT option can be used can be further confirmed in consideration of fair coexistence.

The no-LBT option may be applied to the 6GHz band if permitted by regulations. Restrictions or conditions when the no-LBT option can be used can be confirmed when a fair coexistence criterion for the 6GHz band is defined. In this case, the channel access mechanism must be compliant and may have to be tuned for a specific frequency range.

The initial active DL/UL BWP may be about 20 MHz in the 5 GHz band. The final value may be quantized as the number of PRBs. Using similar channelization to the 5 GHz band in the 6 GHz band, the initially activated DL/UL BWP in the 6 GHz band may be around 20 MHz.

The present disclosure proposes a resource allocation method that can support the multi-LBT structure of the NR above. In NR-U, listen before talk (LBT) is performed to provide coexistence with WiFi devices, and a corresponding channel is used only when it is empty. In addition, LBT may be performed by dividing the entire bandwidth that can be allocated to a wideband into a plurality of BWPs or subbands.

Accordingly, in the present disclosure, a resource allocation method that can include whether LBT succeeds or not in subband-based resource allocation and an interlacing method specialized for a corresponding subband and BWP are proposed together.

Hereinafter, NR-U for the unlicensed band will be described on the premise, but the present invention is not limited thereto. The following description is substantially equally applicable to NR and LTE, unless it is essentially contrary to the spirit of the invention. In addition, the following description based on a subband may be substantially identically applied even in the case of substituting for the BWP, as long as it does not essentially go against the spirit of the invention.

Embodiment 1. An interlacing unit for each subband may be set differently.

Hereinafter, an interlacing method for each subband or BWP in resource allocation for each subband or BWP will be described. That is, a method for setting an interlacing pattern for several subbands or BWP will be described. Hereinafter, the subband will be described on the premise, but the present invention is not limited thereto, and the same may be applied to the BWP. In addition, although the uplink is described on the premise, the same can be applied substantially to the downlink.

Hereinafter, it is assumed that interlacing can be applied differently for each subband. In addition, it is assumed that subbands or BWPs can be defined by being divided into different bandwidth sizes. In this case, values for the size of the subband or the size of the BWP may be considered in defining the interlacing pattern as follows.

According to an example, when defining an interlacing pattern for each subband, the size of the subband or the number of PRBs in the subband may be used. For example, the size of a subband or the number of PRBs of a subband for defining an interlacing pattern for each subband may be set as shown in Table 2. According to an example, it is assumed that the SCS of the subband is 15 kHz.

Referring to Table 2, a different interlacing pattern may be applied to each subband according to the size of the subband. For example, as shown in FIG. 14 , the interlacing intervals of subband Subband#0 and subband Subband#1 may be set differently, such as 10PRBs and 5 PRBs, respectively.

According to another example, when defining an interlacing pattern for each subband, the size of the BWP may be used. In the case of a terminal supporting multiple BWP operation, different interlacing pattern settings may be applied for each BWP. In FIG. 14 , different interlacing spacings for each subband may be applied differently for each BWP, even in the case of BWP.

In this regard, an embodiment for determining an interlacing pattern for each subband will be described below.

According to an example, the interlacing pattern and unit may be directly signaled through DCI. That is, the interlacing pattern for each subband may be directly indicated in DCI. This means that an interlacing interval to be applied for each subband may be indicated in the existing DCI. Accordingly, it is possible to change the interlacing pattern and the unit in the most flexible manner for each subband.

For example, when the UE detects a corresponding PDCCH, the interlacing field, which is a DCI field included in the corresponding grant, may indicate an interlacing unit such as Subband#0: 0, Subband#1: 1, etc. have. That is, if the value of the interlacing field is '0', it is assumed that a 10 RB interval is indicated, and if the value of the interlacing field is '1', it is assumed that a 5 RB interval is indicated. In this case, an interlacing unit may be configured for subband subband#0 in units of 10 PRBs, and an interlacing unit may be configured for subband subband#1 in units of 5 PRBs.

According to another example, the interlacing unit may be directly signaled through RRC signaling. That is, the interlacing pattern for each subband may be indicated by RRC signaling. Interlacing pattern values for multiple subbands may be indicated through single RRC signaling, and a specific method may be applied substantially the same as the method using DCI. However, when applying the BWP, the interlacing pattern value to be applied to each BWP is applied to the terminal through RRC signaling for each BWP.

According to another example, the interlacing unit may be determined as a value dependent on the size of a subband or BWP. In this case, unlike the above-described example using DCI or RRC signaling, there is no need for separate signaling to indicate the interlacing unit to the UE. That is, the interlacing unit may be determined by a predefined method through a value defined during subband division.

In this case, as shown in Table 3, an interlacing unit may be determined in a predefined size according to the size of an initially divided subband or BWP. When the size of the bandwidth for each subband is determined during initial subband setting, an interlacing interval satisfying the corresponding range is determined accordingly, and a basic interlacing unit according to the interlacing interval ) can also be determined. For example, when the bandwidth of the subband is determined to be 20 MHz, since the interlacing interval is determined at 10 PRB intervals, each interlacing unit is determined at 10 PRB intervals for all 100 PRBs, so the number of interlacing units is 10 dog can be determined.

According to another example, the interlacing unit may be determined according to the size of the resource allocation field in DCI. In this case, the size of the resource allocation field may be used in performing interlacing. Also, a resource allocation method may be considered. Specifically, it may be divided into a case of allocating a single subband with a single DCI and a case of indicating multiple subband assignment with a multiple DCI. In the latter case, the interlacing pattern may be repeatedly applied to each subband.

Specifically, in the interlacing-based subband resource allocation, the number of interlaces of consecutive indexes and a start index may be indicated through UL resource allocation type 2 . Alternatively, a bitmap may be used for interlacing-based subband resource allocation. Alternatively, a predefined resource allocation pattern may be used for interlacing-based subband resource allocation.

In this case, if the number of bits for resource allocation is limited to 'N_RA', an interlacing pattern may be determined accordingly. For example, when N_RA is 10 bits and SCS is 15 kHz, it is assumed that bitmap-based resource allocation is applied. In the case of a subband having a bandwidth of 20 MHz, the interlacing interval is 10 PRBs, and since the number of interlacing units in which the actual resource allocation is made is 10, the resource allocation may be performed with 10 bits of N_RA. On the other hand, if the interlacing interval is 5 PRB, the number of interlacing units becomes 20, so that 20 bits are required for N_RA. Therefore, since it exceeds the previously determined 10-bit resource allocation field, interlacing with an interval of 5 PRBs cannot be applied in the corresponding subband.

If the bandwidth is 10 MHz, since all 50 PRBs are distributed so as to have an interval of 5 units, 10 interlacing units are generated, so that the N_RA resource can be allocated with 10 bits.

According to another example, it is possible to use or not to use a portion that is not accurately distributed to the interlacing unit in the entire bandwidth. When dividing a PRB for interlacing, residual PRBs not included in an interlacing unit may occur. When the interlacing interval is determined in a specific unit, the total PRBs of the bandwidth may not be accurately divided for each subband or each BWP. For example, referring to FIG. 15 , when the bandwidth is 75 PRBs as in subband subband#1, if the interlacing interval is defined as 10 PRBs, the last 5 PRBs remain. Whether to use these remaining PRBs may be indicated to the UE. For example, whether the remaining PRB is used may be signaled by DCI or RRC. When a field for indicating this is added in DCI, the on/off state may be signaled with 1 bit, and similarly, it may be indicated through RRC signaling.

For example, when indicating not to use the residual PRB, resources may not be allocated to the residual part divided by the interlacing interval value. Alternatively, when indicating to use the residual PRB, resources may be allocated to the residual part divided by the interlacing interval value. For this, whether the remaining PRB part is used or not may be signaled by DCI or RRC.

When the remaining PRB part is used, the existing interlacing pattern may be equally applied to the corresponding part. In this case, the latter part of the interlacing pattern is omitted. For example, as shown in FIG. 16 , for the remaining PRBs RB#70 to RB#74, only 5 patterns out of a total of 10 interlacing patterns are defined, and the remaining patterns are omitted. This method of defining the interlacing pattern can be applied substantially the same to the BWP setting.

According to another example, when the size of the subband is fixed, the interlacing unit may be set differently according to the subcarrier spacing. In this case, the above-described method for indicating through DCI or RRC signaling or examples determined according to a predefined setting may be applied substantially the same. Accordingly, a method of considering the number of PRBs that vary depending on the SCS when the bandwidth of the subband is fixed to a specific value will be described below in detail. For example, if it is assumed that the bandwidth of the subband is 20 MHz and SCS is 15 kHz, 30 kHz, and 60 kHz, respectively, the number of PRBs according to each SCS is shown in Table 4.

In this case, since the number of PRBs defined for each SCS is different, an interlacing interval and an interlacing unit may be applied accordingly. For example, when SCS is 15 kHz, 10 PRB intervals are supported, and thus, 10 interlacing units may be determined. Alternatively, when SCS is 30 kHz, 10 or 5 PRB intervals are supported, and when SCS is 60 kHz, 5 PRB intervals may be supported. Accordingly, a variable interlacing pattern according to the SCS of a subband or BWP may be set.

Accordingly, it is possible to provide a specific method and apparatus capable of transmitting an uplink channel based on interlacing information determined according to subcarrier spacing in an unlicensed band.

Embodiment 2. A resource allocation method capable of indicating resources in units of subbands may be applied.

In NR-U, a stand-alone design for an unlicensed band is being considered. In addition, in order to increase the LBT success probability, multiple BWP (Bandwidth Part), subband scheduling (subband scheduling), etc. are being considered. However, since resource transmission is performed after LBT even in scheduling for each subband and BWP, there may be a problem in which information on LBT success or failure must be indicated to the terminal at the time of scheduling.

In this embodiment, in allocating a resource based on multiple subbands, it is assumed that one DCI is used. That is, when the terminal detects a DCI corresponding to the terminal, a mapping subband of the PDSCH in which transmission is actually performed after LBT success can be indicated through the resource allocation field. That is, the existing resource allocation field may be replaced with the subband allocation field. In this case, according to an example, a method for subband allocation may be expressed in a bitmap format as in resource allocation type-0.

Specifically, assuming that the resource allocation field in the DCI is N-bit, the double N_subband bit may be interpreted as a bit for allocating the subband to which the PDSCH is transmitted after the actual LBT success. The remaining N-N_subband bits may be used to indicate a separate field for actual PRB allocation in the subband.

Through this, the UE can receive the PDSCH through general Type-0 resource allocation without needing to know the presence or absence of LBT for each subband. It is assumed that the allocation of PRB sets in the following subbands can be equally applied to all subbands. However, if there is no restriction on the resource allocation field, allocation for different PRB sets for each subband may also be applied. These contents can be applied substantially the same to multiple BWPs.

According to an example, all PRB usage in a subband may be assumed. That is, the UE may assume that data is allocated to all PRBs in the allocated subband.

According to another example, it may be indicated to use some PRBs in a subband. For example, a PRB set in which a UE in a subband transmits data may be predefined. In this case, the actual PRB set in the subband may be allocated in a form predefined for resource allocation within the UE. That is, according to a predetermined pattern at the initial subband setting time, a PRB set in which data transmission is performed may be determined without a separate change.

Or, for another example, the UE in the subband may signal a PRB set to transmit data through DCI or RRC. In this case, the position may be directly signaled using DCI or RRC for the allocated position of the PRB set in the subband. For example, if N-N_subband is 4 bits for the additional bits, whether to transmit 4 PRS sets existing in the subband can be expressed in an on/off form using each bit.

Alternatively, as another example, the PRB set to which the UE in the subband transmits data may be determined using indirect information. In this case, the UE can use information such as the UE-ID and DMRS antenna port for the PRB set allocation position in the subband to know the position where the actual PDSCH is transmitted.

According to this, it is possible to provide a specific method and apparatus capable of instructing resource allocation in units of subbands in an unlicensed band.

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 showing the configuration of a user terminal 1100 according to another embodiment.

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

The receiver 1710 receives downlink control information, data, and a message from the base station through a corresponding channel. In addition, the controller 1720 controls the overall operation of the user terminal 1700 according to a method in which the terminal required to perform the above-described present invention transmits an uplink channel in an unlicensed band. The transmitter 1730 transmits uplink control information, data, and a message to the base station through a corresponding channel.

According to an example, the controller 1720 may configure an interlace for an uplink channel based on interlacing information that is divided and determined according to subcarrier spacing (SCS) of the unlicensed band. There is (S1200).

According to an example, the controller 1720 may configure an interlace for the uplink channel in order to transmit the uplink channel in the unlicensed band. An interlacing interval in units of PRBs may be set in the interlace, and each interlace may be repeatedly configured according to the interlacing interval.

According to an example, the controller 1720 may determine interlacing information for the interlacing pattern according to the subcarrier spacing of the unlicensed band. In this case, in resource allocation for each subband constituting the bandwidth, an interlacing pattern for each subband may be set.

According to an example, subbands used for transmission of an uplink channel may be configured with different bandwidths, and interlacing may be applied differently for each subband. In this case, values for the size of the subband may be considered in setting the interlacing pattern. When defining an interlacing pattern for each subband, the size of the subband or the number of PRBs in the subband may be used.

When the size of the subband is fixed, the interlacing unit may be set differently according to the subcarrier spacing of the subband. For example, it is assumed that the bandwidth of the subband is 20 MHz. When the SCS of the subband is 15 kHz, 30 kHz, and 60 kHz, respectively, the number of PRBs of the subband according to each SCS is 100, 50, and 25, respectively.

In this case, since the number of PRBs defined for each SCS is different, the interlacing interval and interlacing unit included in the interlacing information may be configured accordingly. For example, when the SCS is 15 kHz, 10 interlaces, which are interlacing units, may be configured according to an interval of 10 PRBs. When the SCS is 30 kHz, according to an interval of 10 PRBs, 5 interlaces may be configured. That is, variable interlacing information according to the SCS of the subband may be configured.

According to an example, the receiver 1710 may receive interlacing information through DCI. For example, when the UE detects a corresponding PDCCH, the interlacing field, which is a DCI field included in the corresponding grant, may indicate an interlacing unit such as Subband#0: 0, Subband#1: 1, etc. have. That is, if the value of the interlacing field is '0', it is assumed that a 10 RB interval is indicated, and if the value of the interlacing field is '1', it is assumed that a 5 RB interval is indicated. In this case, an interlacing unit may be configured for subband subband#0 in units of 10 PRBs, and an interlacing unit may be configured for subband subband#1 in units of 5 PRBs.

According to another example, the receiver 1710 may receive interlacing information through RRC signaling. Interlacing pattern values for multiple subbands may be indicated through single RRC signaling, and a specific method may be applied substantially the same as the method using DCI.

According to another example, the controller 1720 may determine the interlacing information as a value dependent on the size of the subband or BWP. In this case, unlike the above-described example using DCI or RRC signaling, there is no need for separate signaling to indicate the interlacing unit to the UE. That is, the interlacing unit may be determined by a predefined method through a value defined during subband division.

In this case, the interlacing unit may be determined with a predefined size according to the size of the initially divided subband. When the size of the bandwidth for each subband is determined at the time of initial subband setting, an interlacing interval satisfying the corresponding range is determined accordingly, and basic interlacing units may also be determined according to the interlacing interval. . For example, when the bandwidth of the subband is determined to be 20 MHz, since the interlacing interval is determined at 10 PRB intervals, each interlacing unit is determined at 10 PRB intervals for all 100 PRBs, so the number of interlacing units is 10 dog can be determined.

According to another example, the controller 1720 may determine the interlacing unit according to the size of the resource allocation field in the DCI. In this case, the size of the resource allocation field may be used in performing interlacing. For example, if the number of bits for resource allocation is limited to 'N_RA', an interlacing pattern may be determined accordingly. For example, when N_RA is 10 bits and SCS is 15 kHz, it is assumed that bitmap-based resource allocation is applied. In the case of a subband having a bandwidth of 20 MHz, the interlacing interval is 10 PRBs, and since the number of interlacing units for which actual resource allocation is made is 10, resource allocation can be made with 10 bits of N_RA. On the other hand, if the interlacing interval is 5 PRB, the number of interlacing units becomes 20, so that 20 bits are required for N_RA. Therefore, since it exceeds the previously determined 10-bit resource allocation field, interlacing with an interval of 5 PRBs cannot be applied in the corresponding subband.

If the bandwidth is 10 MHz, since all 50 PRBs are distributed so as to have an interval of 5 units, 10 interlacing units are generated, so that the N_RA resource can be allocated with 10 bits.

The controller 1720 may perform interlacing on the uplink channel based on the interlacing information.

The transmitter 1730 may transmit an uplink channel by applying interlace.

Accordingly, it is possible to provide a specific method and apparatus capable of transmitting an uplink channel based on interlacing information determined according to subcarrier spacing in an unlicensed band.

18 is a diagram showing the 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 a method for a base station to receive an uplink channel in an unlicensed band necessary for carrying out the above-described present invention. The transmitter 1820 and the receiver 1830 are used to transmit/receive signals, messages, and data necessary for carrying out the present invention to and from the terminal.

According to an example, the receiver 1830 may receive an uplink channel to which interlace is applied in an unlicensed band.

The controller 1810 may acquire information included in an uplink channel based on interlacing information on the interlace.

According to an example, the receiver 1830 may receive an uplink channel to which the interlace configured in the terminal is applied. An interlacing interval in units of PRBs may be set in the interlace, and each interlace may be repeatedly configured according to the interlacing interval.

According to an example, the interlacing information for the interlacing pattern may be divided and determined according to the subcarrier spacing of the unlicensed band. In this case, in resource allocation for each subband constituting the bandwidth, an interlacing pattern for each subband may be set.

According to an example, subbands used for transmission of an uplink channel may be configured with different bandwidths, and interlacing may be applied differently for each subband. In this case, values for the size of the subband may be considered in setting the interlacing pattern. When defining an interlacing pattern for each subband, the size of the subband or the number of PRBs in the subband may be used.

When the size of the subband is fixed, the interlacing unit may be set differently according to the subcarrier spacing of the subband. For example, it is assumed that the bandwidth of the subband is 20 MHz. When the SCS of the subband is 15 kHz, 30 kHz, and 60 kHz, respectively, the number of PRBs of the subband according to each SCS is 100, 50, and 25, respectively.

In this case, since the number of PRBs defined for each SCS is different, the interlacing interval and interlacing unit included in the interlacing information may be configured accordingly. For example, when the SCS is 15 kHz, 10 interlaces, which are interlacing units, may be configured according to an interval of 10 PRBs. When the SCS is 30 kHz, according to an interval of 10 PRBs, 5 interlaces may be configured. That is, variable interlacing information according to the SCS of the subband may be configured.

According to an example, the transmitter 1820 may directly signal interlacing information through DCI. For example, when the UE detects a corresponding PDCCH, the interlacing field, which is a DCI field included in the corresponding grant, may indicate an interlacing unit such as Subband#0: 0, Subband#1: 1, etc. have. That is, if the value of the interlacing field is '0', it is assumed that a 10 RB interval is indicated, and if the value of the interlacing field is '1', it is assumed that a 5 RB interval is indicated. In this case, an interlacing unit may be configured for subband subband#0 in units of 10 PRBs, and an interlacing unit may be configured for subband subband#1 in units of 5 PRBs.

According to another example, the transmitter 1820 may directly signal interlacing information through RRC signaling. Interlacing pattern values for multiple subbands may be indicated through single RRC signaling, and a specific method may be applied substantially the same as the method using DCI.

According to another example, the interlacing information may be determined as a value dependent on the size of a subband or BWP. In this case, unlike the above-described example using DCI or RRC signaling, the transmitter 1820 does not need to perform separate signaling to indicate the interlacing unit to the UE. That is, the interlacing unit may be determined by a predefined method through a value defined during subband division.

In this case, the interlacing unit may be determined with a predefined size according to the size of the initially divided subband. When the size of the bandwidth for each subband is determined at the time of initial subband setting, an interlacing interval satisfying the corresponding range is determined accordingly, and basic interlacing units may also be determined according to the interlacing interval. . For example, if the bandwidth of the subband is determined to be 20 MHz, since the interlacing interval is determined at 10 PRB intervals, each interlacing unit is determined at 10 PRB intervals for all 100 PRBs, so the number of interlacing units is 10 dog can be determined.

According to another example, the interlacing unit may be determined according to the size of the resource allocation field in the DCI transmitted by the transmitter 1820 . In this case, the size of the resource allocation field may be used in performing interlacing. For example, if the number of bits for resource allocation is limited to 'N_RA', an interlacing pattern may be determined accordingly. For example, when N_RA is 10 bits and SCS is 15 kHz, it is assumed that bitmap-based resource allocation is applied. In the case of a subband having a bandwidth of 20 MHz, the interlacing interval is 10 PRBs, and since the number of interlacing units for which actual resource allocation is made is 10, resource allocation can be made with 10 bits of N_RA. On the other hand, if the interlacing interval is 5 PRB, the number of interlacing units becomes 20, so that 20 bits are required for N_RA. Therefore, since it exceeds the previously determined 10-bit resource allocation field, interlacing with an interval of 5 PRBs cannot be applied in the corresponding subband.

If the bandwidth is 10 MHz, since all 50 PRBs are distributed so as to have an interval of 5 units, 10 interlacing units are generated, so that the N_RA resource can be allocated with 10 bits.

The receiver 1830 may obtain information from an uplink channel to which interlacing is applied, based on the interlacing information.

Accordingly, it is possible to provide a specific method and apparatus capable of receiving an uplink channel based on interlacing information determined according to subcarrier spacing in an unlicensed band.

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

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

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

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

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

The above description is merely illustrative of the technical spirit of the present disclosure, and those of ordinary skill in the art to which the present disclosure pertains may make various modifications and variations 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 explain, and thus the scope of the present technical spirit is not limited by these embodiments. The protection scope of the present disclosure should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present disclosure.

Claims (20)

In a method for a terminal to transmit an uplink channel in an unlicensed band,
configuring an interlace for an uplink channel based on interlacing information that is divided and determined according to subcarrier spacing (SCS) of an unlicensed band; and
Transmitting the uplink channel to the base station by applying the interlace,
The interlacing information is
It includes information on the number of interlaces and the number of physical resource blocks (PRBs) for each interlace, and is separately set for each of a plurality of bandwidth parts (BWPs) configured for the terminal. Received from the base station through signaling,
The number of interlaces and the number of physical resource blocks for each interlace are,
Method determined based on the number of physical resource blocks constituting a bandwidth part in which the uplink channel is transmitted among the plurality of bandwidth parts. delete The method of claim 1,
The interlacing information is
When the subcarrier spacing is 15 kHz, the number of interlaces is 10, and the number of physical resource blocks for each interlace is 10. The method of claim 1,
The interlacing information is
When the subcarrier spacing is 30 kHz, the number of interlaces is 5, and the number of physical resource blocks for each interlace is 10. delete In a method for a base station to receive an uplink channel in an unlicensed band,
Receiving an uplink channel to which interlace is applied in an unlicensed band from a terminal; and
Comprising the step of obtaining information included in an uplink channel based on the interlacing information for the interlace,
The interlacing information is
It includes information on the number of interlaces and the number of physical resource blocks (PRBs) for each interlace, and is separately set for each of a plurality of bandwidth parts (BWPs) configured for the terminal. transmitted to the terminal through signaling,
The number of interlaces and the number of physical resource blocks for each interlace are,
Method determined based on the number of physical resource blocks constituting a bandwidth part in which the uplink channel is received from among the plurality of bandwidth parts. delete 7. The method of claim 6,
The interlacing information is
When the subcarrier spacing is 15 kHz, the number of interlaces is 10, and the number of physical resource blocks for each interlace is 10. 7. The method of claim 6,
The interlacing information is
When the subcarrier spacing is 30 kHz, the number of interlaces is 5, and the number of physical resource blocks for each interlace is 10. delete In a terminal for transmitting an uplink channel in an unlicensed band,
a control unit configured to configure an interlace for an uplink channel based on interlacing information divided and determined according to subcarrier spacing (SCS) of an unlicensed band; and
and a transmitter for transmitting the uplink channel to a base station by applying the interlace,
The interlacing information is
It includes information on the number of interlaces and the number of physical resource blocks (PRBs) for each interlace, and is separately set for each of a plurality of bandwidth parts (BWPs) configured for the terminal. Received from the base station through signaling,
The number of interlaces and the number of physical resource blocks for each interlace are,
A terminal determined based on the number of physical resource blocks constituting a bandwidth part in which the uplink channel is transmitted among the plurality of bandwidth parts. delete 12. The method of claim 11,
The interlacing information is
When the subcarrier spacing is 15 kHz, the number of interlaces is 10, and the number of physical resource blocks for each interlace is 10. 12. The method of claim 11,
The interlacing information is
When the subcarrier spacing is 30 kHz, the number of interlaces is 5, and the number of physical resource blocks for each interlace is 10. delete In a base station for receiving an uplink channel in an unlicensed band,
a receiver for receiving an uplink channel to which interlace is applied from a terminal in an unlicensed band; and
A control unit for obtaining information included in an uplink channel based on the interlacing information for the interlace,
The interlacing information is
It includes information on the number of interlaces and the number of physical resource blocks (PRBs) for each interlace, and is separately set for each of a plurality of bandwidth parts (BWPs) configured for the terminal. transmitted to the terminal through signaling,
The number of interlaces and the number of physical resource blocks for each interlace are,
A base station determined based on the number of physical resource blocks constituting a bandwidth part in which the uplink channel is received among the plurality of bandwidth parts. delete 17. The method of claim 16,
The interlacing information is
When the subcarrier spacing is 15 kHz, the number of interlaces is 10, and the number of physical resource blocks for each interlace is 10. 17. The method of claim 16,
The interlacing information is
When the subcarrier spacing is 30 kHz, the number of interlaces is 5, and the number of physical resource blocks for each interlace is 10. delete

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