terminal

Abstract

A UE (200) receives control information indicating the type of a channel access procedure to be performed in a second frequency band different from a first frequency band allocated for mobile communications, and performs a channel access procedure according to the type of the channel access procedure indicated by the control information.

Description

Technical Field

[0001] The present disclosure relates to a terminal for performing wireless communication, and more particularly, to a terminal for using an unlicensed frequency band. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) has standardized the fifth-generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and has also promoted the standardization of the next generation called Beyond 5G, 5G Evolution or 6G.

[0003] In Release 15 and Release 16 (NR) of 3GPP, operations in multiple frequency ranges (specifically, including bands in FR1 (410 MHz to 7.125 GHz) and FR2 (24.25 GHz to 52.6 GHz)) are standardized.

[0004] In addition, research on NR supporting more than 52.6 GHz and up to 71 GHz is also being promoted (Non-Patent Document 1). Among them, the channel access process that complies with the restrictions on unlicensed spectrum applied in the frequency band of 52.6 GHz to 71 GHz (such as the execution of Listen-Before-Talk (LBT)).

[0005] In addition, regarding the New Radio-Unlicensed (NR-U) that uses the spectrum of this unlicensed (unlicensed) band to expand the available band, 3GPP Release-16 stipulates the sharing of channel occupancy time (COT) between wireless base stations (gNB) and terminals (User Equipment: UE) (Non-Patent Document 2).

[0006] Furthermore, 3GPP Release-16 stipulates that the UE can transmit uplink control information (UCI) including COT sharing information via the PUSCH (Physical Uplink Shared Channel) (Non-Patent Document 3).

[0007] Prior art literature

[0008] Non-patent literature

[0009] Non-patent document 1: "New SID: Study on supporting NR from 52.6GHz to 71GHz", RP-193259, 3GPP TSG RAN Meeting #86, 3GPP, December 2019

[0010] Non-patent document 2: 3GPP TS 37.213 V16.1.0, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Physical layer procedures for shared spectrum channel access (Release 16), 3GPP, March 2020

[0011] Non-patent document 3: 3GPP TS 38.212 V16.0.0, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Multiplexing and channel coding (Release 16), 3GPP, December 2019 Summary of the invention

[0012] In the case of a high frequency band such as 52.6 GHz to 71 GHz, in order to cope with a wider bandwidth and a larger propagation loss, it is necessary to use a massive antenna having a plurality of antenna elements to generate a narrower beam.

[0013] Therefore, regarding LBT (Clear Channel Assessment (CCA)), in which the gNB performs carrier sensing before starting transmission in the unlicensed band and can transmit within a predetermined time length only when it can be confirmed that the channel is not used by other nearby systems, it can also be considered as directional LBT / CCA (also called beam-based LBT / CCA) that requires the use of multiple beams.

[0014] However, the gNB cannot identify the content of Directional LBT / CCA for uplink (UL) performed by the UE.

[0015] In addition, when COT sharing is applied, there is also the problem that it is difficult for the gNB to envision the beam used by the UE for DirectionalLBT / CCA.

[0016] Therefore, the following disclosure is made in view of the above situation, and its purpose is to provide a terminal that can reliably perform UL Directional LBT / CCA even when using multiple beams with different directions.

[0017] One embodiment of the present disclosure provides a terminal (UE200), which has: a receiving unit (control signal / reference signal processing unit 240), which receives control information indicating the type of a channel access process performed in a second frequency band different from a first frequency band allocated for mobile communication; and a control unit (control unit 270), which performs the channel access process according to the type of the channel access process indicated by the control information. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a diagram schematically showing the overall structure of the wireless communication system 10 .

[0019] Figure 2 is a diagram showing a frequency range used in the wireless communication system 10 .

[0020] Figure 3 1 is a diagram showing a configuration example of a radio frame, a subframe, and a time slot used in the wireless communication system 10 .

[0021] Figure 4 This is a functional block diagram of UE200.

[0022] Figure 5 This is a diagram showing a structural example of a gNB-dominated COT.

[0023] Figure 6 It is a diagram showing an execution example of a channel access process based on LBE and FBE.

[0024] Figure 7 This is a diagram showing a configuration example of a conventional Directional LBT / CCA.

[0025] Figure 8 This is a diagram showing a schematic communication sequence between a network and UE 200 including Directional LBT / CCA according to an embodiment.

[0026] Fig. 9 This is a diagram showing a configuration example of Directional-LBT according to Action Example 2.

[0027] Fig.10This is a diagram showing an example of the hardware configuration of UE 200 . DETAILED DESCRIPTION

[0028] Hereinafter, the embodiments will be described based on the drawings. In addition, the same or similar reference numerals are given to the same functions and structures, and the description thereof will be appropriately omitted.

[0029] (1) Overall schematic structure of wireless communication system

[0030] Figure 1 This is a schematic diagram of the overall structure of the wireless communication system 10 involved in this embodiment. The wireless communication system 10 is a wireless communication system that complies with the 5G New Radio (New Radio: NR), including a next-generation radio access network 20 (Next Generation-Radio Access Network 20, hereinafter referred to as NG-RAN 20), and a terminal 200 (hereinafter referred to as UE200).

[0031] In addition, the wireless communication system 10 may be a wireless communication system that complies with a method called Beyond 5G, 5G Evolution, or 6G.

[0032] NG-RAN 20 includes a radio base station 100A (hereinafter referred to as gNB 100A) and a radio base station 100B (hereinafter referred to as gNB 100B). In addition, the specific structure of the wireless communication system 10 including the number of gNBs and UEs is not limited to Figure 1 Example shown.

[0033] NG-RAN 20 actually includes multiple NG-RAN nodes, specifically, gNB (or ng-eNB), which is connected to a 5G-compliant core network (5GC, not shown). In addition, NG-RAN 20 and 5GC can be simply referred to as "network".

[0034] gNB 100A and gNB 100B are 5G-compliant wireless base stations and perform 5G-compliant wireless communications with UE 200. gNB 100A, gNB 100B, and UE 200 can support Massive MIMO (Multiple-Input Multiple-Output) that generates a beam BM with higher directivity by controlling wireless signals transmitted from multiple antenna elements, carrier aggregation (CA) that bundles and uses multiple component carriers (CCs), and dual connectivity (DC) that simultaneously communicates between the UE and two NG-RAN nodes.

[0035] Furthermore, the wireless communication system 10 supports multiple frequency ranges (FR). Figure 2A frequency range used in the wireless communication system 10 is shown.

[0036] like Figure 2 As shown, the wireless communication system 10 supports FR1 and FR2. The frequency band of each FR is as follows.

[0037] FR1: 410MHz~7.125GHz

[0038] FR2: 24.25 GHz to 52.6 GHz

[0039] In FR1, a sub-carrier spacing (SCS) of 15, 30 or 60 kHz and a bandwidth (BW) of 5 to 100 MHz can be used. FR2 has a higher frequency than FR1, uses an SCS of 60 or 120 kHz (including 240 kHz) and a bandwidth (BW) of 50 to 400 MHz.

[0040] In addition, SCS can be interpreted as a numerology. The numerology is defined in 3GPP TS38.300 and corresponds to a subcarrier spacing in the frequency domain.

[0041] In addition, the wireless communication system 10 also supports a frequency band higher than the frequency band of FR2. Specifically, the wireless communication system 10 supports a frequency band exceeding 52.6 GHz and up to 71 GHz. Here, for convenience of description, such a high frequency band is referred to as "FR2x".

[0042] To solve this problem, when using a band exceeding 52.6 GHz, cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) / discrete Fourier transform-spread (DFT-S-OFDM) with a larger sub-carrier spacing (SCS) can be applied.

[0043] Figure 3 A configuration example of a radio frame, a subframe, and a time slot used in the wireless communication system 10 is shown.

[0044] like Figure 3 As shown in the figure, 1 time slot consists of 14 symbols. The larger (wider) the SCS is, the shorter the symbol period (and the time slot period) is. SCS is not limited to Figure 3 The interval (frequency) shown is, for example, 480 kHz, 960 kHz, etc. can be used.

[0045] Furthermore, the number of symbols constituting one slot may not necessarily be 14 symbols (eg, 28 or 56 symbols). Furthermore, the number of slots per subframe may differ according to the SCS.

[0046] in addition, Figure 3 The time direction (t) shown may be referred to as time domain, symbol period, or symbol time, etc. In addition, the frequency direction may also be referred to as frequency domain, resource block, subcarrier, bandwidth part (BWP: Bandwidth part), etc.

[0047] In addition, in the wireless communication system 10, in addition to the frequency band allocated to the wireless communication system 10 (for mobile communication), an unlicensed frequency band Fu different from the frequency band is also used. Specifically, in the wireless communication system 10, New Radio-Unlicensed (NR-U) can be performed to expand the available frequency band using the spectrum of the unlicensed (unlicensed) frequency band. NR-U can also be interpreted as a type of Licensed-Assisted Access (LAA).

[0048] The frequency band allocated to the wireless communication system 10 is included in the frequency ranges of FR1 and FR2 described above, and is allocated based on authorization from the government.

[0049] The unlicensed band Fu is a band that can be used without being assigned a license by the government and is not limited to a specific communication operator. For example, the bands used for wireless LAN (WLAN) (2.4 GHz, 5 GHz band, or 60 GHz band, etc.) can be cited.

[0050] In the unlicensed band Fu, wireless stations can be installed regardless of a specific communication carrier, but it is undesirable that signals from nearby wireless stations interfere with each other to significantly deteriorate communication performance.

[0051] Therefore, for example, in Japan, the Listen-Before-Talk (LBT) mechanism described below is applied: that is, as a request condition for a wireless system using an unlicensed band Fu (e.g., 5 GHz band), before starting transmission, the gNB 100A performs carrier sensing, and transmission within a predetermined time length is possible only when it can be confirmed that the channel is not used by other nearby systems. In addition, carrier sensing is a technology that confirms that the frequency carrier is not used by other communications before transmitting radio waves.

[0052] In addition, LBT includes Directional LBT / CCA (Clear Channel Assessment) using a plurality of beam BMs pointing in different directions.

[0053] The LBT sub-band in NR-U can be set in the unlicensed band Fu, and can be expressed as a band for confirming the use of the unlicensed band Fu. The LBT sub-band can be, for example, 20MHz, half of 10MHz, or 1 / 4 of 5MHz.

[0054] In addition, in the initial access in NR-U, the synchronization signal block (SSB) can also be used as in 3GPP Release-15.

[0055] The SSB is composed of a synchronization signal (SS: Synchronization Signal) and a downlink physical broadcast channel (PBCH: Physical Broadcast CHannel).

[0056] SS is composed of a primary synchronization signal (PSS: Primary SS) and a secondary synchronization signal (SSS: Secondary SS).

[0057] The PSS is a known signal that the UE 200 initially attempts to detect during the cell search process. The SSS is a known signal that is sent during the cell search process in order to detect a physical cell ID.

[0058] PBCH includes the wireless frame number (SFN: System Frame Number), an index for identifying the symbol positions of multiple SS / PBCH Blocks within a half frame (5 milliseconds), and other information required for UE200 to establish frame synchronization with the NR cell formed by gNB 100A after detecting the SS / PBCH Block.

[0059] In addition, PBCH can also include system parameters required for receiving system information (SIB). In addition, SSB also includes a demodulation reference signal for a broadcast channel (DMRS for PBCH). DMRS for PBCH is a known signal sent to measure the radio channel state for PBCH demodulation.

[0060] The terminal assumes that each SSB is associated with a different beam BM. That is, the terminal assumes that each SSB is associated with a beam BM with a different transmission direction (coverage range) (quasi-co-location assumption). As a result, the UE200 residing in the NR cell can receive any beam BM, obtain the SSB, and start initial access and SSB detection and measurement.

[0061] Quasi Co-location (QCL) means that two antenna ports are virtually located at the same position, when, for example, the characteristics of the channel through which symbols on one antenna port are transmitted can be estimated from the channel through which symbols on another antenna port are transmitted. QCL can also be called quasi co-location.

[0062] In addition, the transmission mode of SSB may vary according to SCS, frequency range (FR) or other parameters.

[0063] (2) Functional block structure of wireless communication system

[0064] Next, a functional block configuration of the wireless communication system 10 will be described. Specifically, a functional block configuration of the UE 200 will be described.

[0065] Figure 4 is a functional block diagram of UE 200. Figure 4 As shown, UE 200 includes a radio signal transceiver 210 , an amplifier 220 , a modulation and demodulation unit 230 , a control signal and reference signal processing unit 240 , an encoding and decoding unit 250 , a data transceiver 260 , and a control unit 270 .

[0066] The wireless signal transceiver 210 transmits and receives wireless signals based on NR. The wireless signal transceiver 210 supports Massive MIMO, CA that bundles and uses multiple CCs, and DC that simultaneously communicates between the UE and two NG-RAN Nodes.

[0067] The amplifier unit 220 is composed of a PA (Power Amplifier) / LNA (Low Noise Amplifier) ​​etc. The amplifier unit 220 amplifies the signal output from the modulation and demodulation unit 230 to a predetermined power level. In addition, the amplifier unit 220 amplifies the RF signal output from the wireless signal transmission and reception unit 210 .

[0068] The modem unit 230 performs data modulation / demodulation, transmission power setting, resource block allocation, etc. according to each predetermined communication destination (gNB 100A or other gNB). In the modem unit 230, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform-Spread (DFT-S-OFDM) can be applied. In addition, DFT-S-OFDM can be used not only for uplink (UL) but also for downlink (DL).

[0069] The control signal / reference signal processing unit 240 performs processing related to various control signals transmitted and received by the UE 200 and processing related to various reference signals transmitted and received by the UE 200 .

[0070] Specifically, the control signal / reference signal processing unit 240 receives various control signals transmitted from the gNB 100 via a predetermined control channel, for example, a control signal of the radio resource control layer (RRC). In addition, the control signal / reference signal processing unit 240 transmits various control signals to the gNB 100 via a predetermined control channel.

[0071] The control signal / reference signal processing unit 240 performs processing using reference signals (RS) such as a demodulation reference signal (DMRS) and a phase tracking reference signal (PTRS).

[0072] DMRS is a terminal-specific reference signal (pilot signal) known between the base station and the terminal for estimating a fading channel used for data demodulation. PTRS is a terminal-specific reference signal for estimating phase noise, which is a problem in high frequency bands.

[0073] In addition, in addition to DMRS and PTRS, reference signals also include a channel state information-reference signal (CSI-RS), a sounding reference signal (SRS), and a positioning reference signal (PRS) for position information.

[0074] In addition, the channels include control channels and data channels. The control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), RACH (Random Access Channel, Downlink Control Information (DCI) including the Random Access Radio Network Temporary Identifier (RA-RNTI)), and Physical Broadcast Channel (PBCH).

[0075] In addition, data channels include PDSCH (Physical Downlink Shared Channel), PUSCH (Physical Uplink Shared Channel), etc. Data refers to data transmitted via the data channel. The data channel may also be replaced by a shared channel.

[0076] In addition, with respect to NR-U, a channel may refer to a carrier or a portion of a carrier consisting of a set of consecutive resource blocks (RBs) where a channel access procedure is performed in a shared spectrum.

[0077] The channel access procedure may be interpreted as a procedure based on monitoring to evaluate the availability of a channel for transmission. In addition, a basic unit for monitoring may be defined as a monitoring slot having a predetermined time.

[0078] During the monitoring time slot, gNB 100A (or gNB 100B, the same below) or UE200 detects the channel. If the detected power is at least less than the energy detection threshold, it is considered to be idle. Otherwise, it is considered to be busy during the monitoring time slot.

[0079] In addition, "Channel Occupancy" can refer to the transmission on the channel performed by the gNB (which can be an eNB) / UE after performing the corresponding channel access process.

[0080] Channel Occupancy Time (COT) is the total time that the gNB / UE sharing the channel and any gNB / UE perform transmissions on the channel after the gNB / UE performs the corresponding channel access procedure. The channel occupation time can be shared for transmissions between the gNB and the corresponding UE.

[0081] A DL transmission burst may be defined as a collection of transmissions from the gNB. A DL transmission burst with a gap larger than a predetermined transmission gap may be considered as a separate DL transmission burst.

[0082] An uplink (UL) transmission burst may be defined as an aggregate of transmissions from a UE. A UL transmission burst having a gap larger than a predetermined transmission gap may be considered as a separate UL transmission burst.

[0083] A discovery burst may be defined as a DL transmission burst confined within a predetermined window and containing a set of signals or channels associated with a duty cycle.

[0084] As a discovery burst, any of the following transmissions initiated by the gNB can be specified.

[0085] Primary synchronization signal (PSS)

[0086] Secondary synchronization signal (SSS)

[0087] Downlink Physical Broadcast Channel (PBCH)

[0088] CORESET (control resource sets) for PDCCH that schedules PDSCH

[0089] PDSCH carrying SIB1 and / or non-zero power CSI-RS

[0090] In addition, in the present embodiment, the control signal / reference signal processing unit 240 can receive control information indicating the type of channel access procedure (which can also be interpreted as LBT / CCA) performed in a frequency band (second frequency band) different from the frequency band (first frequency band) allocated for use (mobile communication) in the wireless communication system 10. In the present embodiment, the control signal / reference signal processing unit 240 constitutes a receiving unit.

[0091] Specifically, the control signal / reference signal processing unit 240 can receive downlink control information (DCI) including the type of channel access procedure. In addition, the control signal / reference signal processing unit 240 can receive the control information through signaling of a higher layer (RRC) instead of DCI.

[0092] In addition, the type of the channel access process may be LBT using an omni-LBT or LBT using a directional beam BM. Alternatively, it may be a type of channel access process specified in 3GPP TS37.213 (Type 1, 2A, 2B, 2C, etc.).

[0093] In addition, the control signal / reference signal processing unit 240 is capable of transmitting uplink control information (UCI) including information of the beam BM used in the channel occupancy time (COT) after the channel access process to the network (specifically, gNB 100A or gNB 100B). In this embodiment, the control signal / reference signal processing unit 240 constitutes a transmitting unit.

[0094] Specifically, the control signal / reference signal processing unit 240 can transmit a CG (Configured Grant)-UCI including a field indicating information of the beam to the network.

[0095] The encoding / decoding unit 250 performs data segmentation / concatenation and channel coding / decoding, etc. according to each predetermined communication destination (gNB 100A or other gNB).

[0096] Specifically, the encoding / decoding unit 250 divides the data output from the data transceiver unit 260 into predetermined sizes and performs channel coding on the divided data. In addition, the encoding / decoding unit 250 decodes the data output from the modulation / demodulation unit 230 and concatenates the decoded data.

[0097] The data transceiver 260 performs transmission and reception of protocol data units (PDU) and service data units (SDU). Specifically, the data transceiver 260 performs assembly / disassembly of PDU / SDU in multiple layers (such as the medium access control layer (MAC), the radio link control layer (RLC), and the packet data convergence protocol layer (PDCP)). In addition, the data transceiver 260 performs error correction and retransmission control of data according to hybrid ARQ (Hybrid automatic repeat request).

[0098] The control unit 270 controls each functional block constituting the UE 200. In particular, in the present embodiment, the control unit 270 performs control related to NR-U.

[0099] Specifically, the control unit 270 can execute the channel access procedure according to the type of the channel access procedure indicated by the control information indicating the type of the channel access procedure (LBT).

[0100] Specifically, the control unit 270 determines the type of LBT to be performed according to the type of LBT (e.g., Omni-LBT or Directional-LBT) included in the DCI (or RRC signaling). The control unit 270 can perform LBT (e.g., Omni-LBT or Directional-LBT) according to the determined type of LBT. In addition, as described above, the type of channel access procedure can be the type of channel access procedure specified in 3GPP TS37.213.

[0101] Alternatively, the control unit 270 may determine the configuration of the beam BM used in the channel access process based on the information of the uplink reference signal included in the DCI.

[0102] Specifically, the control unit 270 can determine the configuration of the beam BM of the channel access process (LBT) according to the information of the Sounding Reference Signal (SRS) included in the DCI. More specifically, the control unit 270 can determine the configuration of the beam BM applied to the LBT according to the identification information of the SRS, i.e., the SRS Resource Indicator (SRI) (which can correspond to the index of the SSB or CSI-RS).

[0103] In addition, the information is not limited to SRI, and information of SRS or other UL reference signals (RS) may be used. The control unit 270 may determine the beam BM associated with the uplink reference signal and perform LBT using the beam BM.

[0104] (3) Operation of wireless communication system

[0105] Next, the operation of the wireless communication system 10 is described. Specifically, the operation of the gNB 100A (or gNB 100B, the same below) and the UE 200 related to the UL channel access process (Directional LBT / CCA) using multiple beam BMs is described.

[0106] In addition, the Directional LBT / CCA according to the present embodiment is particularly preferably used in a high frequency band such as FR2x.

[0107] (3.1) Prerequisites

[0108] In any of the licensed frequency bands such as FR1 and FR2 for mobile communications and the unlicensed frequency band Fu, for example, a maximum of 64 SSBs can be supported, that is, a plurality of beam BMs having different directions (directivities) associated with each SSB can be supported.

[0109] In addition, as described above, in order to achieve channel access complying with LBT / CCA in the unlicensed band Fu, Directional LBT / CCA (also referred to as beam-based LBT / CCA) can be applied, that is, a channel access process using multiple beams BM can be applied.

[0110] In NR-U of 3GPP Release-16, the sharing of the channel occupancy time (COT) between gNB 100A and UE 200 is allowed under certain restrictions, such as the transmission period, the type of transmission signal / channel, and the priority level.

[0111] Regarding the period of COT (the structure of CO (available LBT sub-band, length of COT), DCI format 2_0 can be used to represent the group of UE 200.

[0112] Figure 5 An example of the structure of a gNB-dominated COT is shown. Figure 5 As shown, the structure of "channel occupation" (CO) can be notified to UE200 using DCI format 2_0. Figure 5 In the example shown, LBT is performed in multiple LBT sub-bands, and COT (gNB-initiated COT) is set after the LBT.

[0113] When a higher layer (RRC) parameter, namely availableRB-SetPerCell-r16, is set, the parameter can be expressed as follows, for example.

[0114] ·Available RB set Indicator 1,Available RB set Indicator 2,…,Available RB set Indicator N1,

[0115] In addition, when a parameter of a higher layer (RRC), namely CO-DurationPerCell-r16, is set, for example, the parameter can be expressed as follows.

[0116] ·COT duration indicator 1,COT duration indicator 2,…,COT durationindicator N2.

[0117] Figure 6 An example of the execution of the channel access process based on LBE and FBE is shown. Specifically, Figure 6 An example of a channel access process (LBT / CCA) based on LBE (Load Based Equipment) and FBE (Frame Based Equipment) and a COT after the channel access process is shown.

[0118] LBE and FBE differ in frames used for transmission and reception, configuration of COT, and the like.

[0119] For FBE, the timing of transceiving associated with LBT is fixed. For LBE, the timing of transceiving associated with LBT is not fixed, but LBT can be performed flexibly according to needs, etc. In the case of LBE, a backoff time can be set to avoid conflicts.

[0120] exist Figure 6 In the example of LBE shown, multiple channel access procedures are performed over time, and a contention window size (CWS) corresponding to the length of the COT can be set. In addition, in order to prevent collisions, transmission is not allowed until the backoff time expires (the backoff timer is 0). In addition, as Figure 6 As shown, it is possible to set the COT (gNB-initiated COT) after the channel access process led by the gNB is executed, and the COT (UE-initiated COT) after the channel access process led by the UE is executed.

[0121] On the other hand, Figure 6 In the example of FBE shown, multiple channel access procedures are also performed as time passes. However, the timing of transmission and reception associated with LBT is fixed according to a fixed frame period (FFP).

[0122] Furthermore, in 3GPP Release-16, in order to perform UL scheduling, DCI format0_1 used for PUSCH scheduling has a field indicating the type of UL LBT and a channel access priority class (CAPC) of associated parameters.

[0123] For example, in DCI format 0_1, the ChannelAccess-CPext-CAPC field is defined (refer to 3GPP TS 38.212 Chapter 7.3.1). This field can be set to 0, 1, 2, 3, 4, 5 or 6 bits, and can be determined by a higher layer parameter (ul-dci-triggered-UL-ChannelAccess-CPext-CAPC-r16).

[0124] In addition, in order to indicate the sharing of the channel occupancy time (COT) from UL to downlink (DL), UE 200 can transmit CG (Configured Grant)-UCI via PUSCH. Table 1 shows the content related to COT sharing information specified in 3GPP TS38.212.

[0125] [Table 1]

[0126]

[0127] In addition, when using high frequency bands such as FR2x, in particular, in order to cope with wider bandwidths and greater propagation losses, it is envisaged that Directional LBT / CCA (beam-based LBT / CCA) using multiple beams BM in different directions can be applied. This can improve the success rate of channel access even in high frequency bands such as FR2x.

[0128] However, in the case of implementing such Directional LBT / CCA, there are the following problems regarding NR-U of 3GPP Release-16. Specifically, it is not possible to indicate to UE 200 the support and / or method of Directional-LBT of UL performed by UE 200 (Problem 1).

[0129] In addition, in the case where gNB 100A shares the UE200-dominated channel occupation (CO) with the allowed PUSCH transmission and Directional-LBT, gNB 100A cannot envision the content of the allowed beam BM transmission in the shared COT (Problem 2).

[0130] Figure 7 The following is a structural example of a conventional Directional LBT / CCA. Specifically, Figure 7 An example of performing COT sharing from UL to DL is shown.

[0131] In this case, gNB 100A cannot determine whether the UL beam BM and the DL beam BM are the same (i.e., the same direction) during COT sharing based on UE-initiated COT.

[0132] (3.2) Operation Overview

[0133] An operation example for solving the above-mentioned problems related to the conventional Directional LBT / CCA will be described below. First, a general communication sequence between the network and the UE 200 including Directional LBT / CCA according to the present embodiment will be described.

[0134] Figure 8 A schematic communication sequence between the network and the UE 200 including Directional LBT / CCA according to the embodiment is shown.

[0135] like Figure 8 As shown, the network (specifically, NG-RAN 20) transmits DCI to UE 200 (S10). Here, as described above, the target DCI may be DCI format 0_1 ​​used in scheduling of PUSCH.

[0136] The DCI may include control information indicating the type of the channel access procedure (LBT) (eg, Omni-LBT or Directional-LBT). In addition, the configuration of the DCI format will be further described later.

[0137] Alternatively, instead of (or in addition to) DCI, NG-RAN 20 may receive the control information through RRC signaling ( S11 ).

[0138] UE 200 performs LBT according to the received control information ( S20 ). Specifically, UE 200 determines the type of LBT to be performed according to the type of LBT (for example, Omni-LBT or Directional-LBT) included in DCI (or RRC signaling).

[0139] UE 200 performs LBT (for example, Omni-LBT or Directional-LBT) according to the determined LBT type.

[0140] In addition, UE200 can transmit uplink control information (specifically, CG-UCI) including information of the beam BM used in the channel occupation time (COT) after the channel access procedure (LBT) to the network (S25).

[0141] As described above, the CG-UCI may include a field indicating information of the beam BM. In addition, the configuration of the CG-UCI will be further described later.

[0142] According to the result of LBT, gNB 100A and UE200 perform the process of establishing a wireless link in the unlicensed band Fu (S30). Specifically, gNB 100A and UE200 establish a wireless link via a predetermined control channel and data channel, and start sending and receiving user data via the wireless link set in the unlicensed band Fu.

[0143] (3.3) Action Example 1

[0144] This action example is related to the transmission and reception of DCI (or RRC signaling) for Directional-LBT for UL.

[0145] Regardless of the type of LBT, such as Omni-LBT or Directional-LBT, the type of LBT performed for UL transmission can be set for UE200 by any of the following methods.

[0146] (Alt 1): Semi-statically set through RRC signaling.

[0147] (Alt 2): Indicated from the network through DCI for UL scheduling (for example, DCI format 0_1).

[0148] In this case, the type of LBT can be indicated by a new bit field added to DCI format 0_1 ​​or an extended field of Channel Access Priority Class (CAPC).

[0149] In the case of the extended field of CAPC, in one or more entries, a new table indicating Omni-LBT or Directional-LBT may be defined for a high frequency band such as FR2x.

[0150] In addition, when Directional-LBT is set / indicated for UL use, Beam BM can be set by any of the following methods.

[0151] (Alt 1): Implicitly indicated by the SRI field of DCI format 0_1 ​​(it can be assumed that the beam BM used in LBT is associated with the beam BM used for UL transmission).

[0152] This method can be applied at least to UL transmission based on the codebook. In addition, the index of the beam BM can be regarded as the index of the SRS / SSB / CSI-RS.

[0153] (Alt 2): Explicitly indicated by DCI format 0_1.

[0154] In this case, in addition, any of the following methods can be applied.

[0155] (Alt 2.1): It is assumed that the beam BM used in LBT is associated with the beam BM used for UL transmission, and the beam BM corresponding to the same reference signal (RS) index can be selected.

[0156] In this case, a new bit field indicating an index of SRS / SSB / CSI-RS, or an extended field of the CAPC in which a new table and entry are defined may be used.

[0157] (Alt 2.2): A new RS and / or beam BM is defined for UL Directional-LBT that is different from the transmit beam.

[0158] In this case, RRC can set a new UL_LBT_RS and / or beam for LBT, and an association with one or more signals (SRS / SSB / CSI-RS) in a spatial relation for UL transmission.

[0159] Furthermore, in this case, an extended field of the CAPC in which a new field indicating an index of a new UL_LBT_RS and / or beam, or a new table and entry is defined may be used.

[0160] (3.4) Action Example 2

[0161] This example operation is related to the transmission and reception of UCI for Directional-LBT for UL. When Directional-LBT is configured / indicated to UE200 for UL, the CG-UCI reported by UE200 may include a new field for indicating the beam BM used during COT sharing from UL to DL.

[0162] In this case, similar to Action Example 1, the index of the beam BM can be regarded as the index of the SRS / SSB / CSI-RS, and can also be used as the index of a new UL_LBT_RS and / or beam for LBT.

[0163] In addition, when gNB 100A shares (COT sharing) UE-initiated COT based on UE200's dominance and sends an allowed (configured grant) PUSCH, in addition to the provisions of 3GPP Release-16, the following provisions can also be complied with: that is, DL transmission during COT sharing should have the same QCL-Type D relationship as the beam BM indicated by CG-UCI.

[0164] In addition, for the QCL type, it is specified in Chapter 5.1.5 of 3GPP TS38.214 as follows.

[0165] QCL-Type A: {Doppler shift, Doppler spread, average delay, delay spread}

[0166] QCL-Type B: {Doppler shift, Doppler spread}

[0167] QCL-Type C: {Doppler shift, average delay}

[0168] QCL-Type D: {Spatial Rx parameter}

[0169] Fig. 9 The following is a structural example of Directional-LBT according to Action Example 2. Specifically, Fig. 9 An example of performing UE-initiated COT, where the COT is shared in UL and DL (COT sharing) is shown.

[0170] like Fig. 9 As shown, UE200 may send a CG-UCI including a new field for indicating the index of SRS / SSB / CSI-RS.

[0171] In addition, in the case of such UE-initiated COT, the beam in the same direction (ie, the beam with QCL-Type D) can be used during the COT sharing period (shared COT).

[0172] (4) Action and Effect

[0173] According to the above-mentioned embodiment, the following effects can be obtained. Specifically, UE200 can receive control information indicating the type of channel access procedure (which can be interpreted as LBT / CCA) performed in a frequency band (second frequency band) different from the frequency band (first frequency band) allocated to the wireless communication system 10 (for mobile communication). In addition, UE200 can perform the channel access procedure according to the type of channel access procedure (LBT) indicated by the received control information.

[0174] Therefore, even when multiple beam BMs are used to support high frequency bands such as FR2x, gNB100A (and gNB100B, hereinafter the same) can indicate the type of channel access procedure (LBT) to UE200 in advance, so that the content of Directional-LBT of UL executed by UE200 can be easily identified. That is, according to UE200, Directional LBT / CCA of UL can be reliably performed even when multiple beam BMs with different directions are used.

[0175] In this embodiment, UE 200 can receive DCI including the type of the above-mentioned channel access procedure. Therefore, it is possible to reliably indicate the type of the channel access procedure (LBT) to UE 200 while utilizing the existing DCI.

[0176] In this embodiment, UE200 can determine the configuration of the beam BM used in the channel access process based on the SRS information (SRI) included in the DCI. Therefore, even if the index of the beam BM is not directly indicated, the SRI included in the existing DCI can be used to implicitly indicate the beam BM used in the channel access process.

[0177] In this embodiment, UE200 is able to send uplink control information (UCI) containing information of beam BM used in channel occupation time (COT) after the channel access process to the network. Therefore, gNB 100A is able to easily and reliably identify the information of beam BM used by UE200 within the UE-initiated COT.

[0178] (5) Other Implementation Methods

[0179] Although the embodiments have been described above, it is apparent to those skilled in the art that the present invention is not limited to the description of the embodiments and that various modifications and improvements can be made.

[0180] For example, in the above-mentioned embodiment, an example of using a specific DCI format (for example, DCI format 0_1) and UCI (CG-UCI) is described, but as long as the same information such as the type of Directional-LBT can be set and / or indicated, different types (formats) of DCI / UCI may be used, and other control information may be used.

[0181] In addition, the unlicensed band may also be referred to by different names, such as License-exempt or Licensed-Assisted Access (LAA).

[0182] The block diagram used in the description of the above-mentioned embodiment ( Figure 4 ) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, using wires, wirelessly, etc.) and implemented using these multiple devices. The functional block can also be implemented by combining software with the above-mentioned one device or the above-mentioned multiple devices.

[0183] Functionally, it includes judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but is not limited to these. For example, the functional block (structural part) that enables the sending function is called a transmitting unit or a transmitter. In short, as mentioned above, there is no particular limitation on the implementation method.

[0184] Furthermore, the above-mentioned UE 200 may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig.10 2 is a diagram showing an example of the hardware configuration of UE 200. Fig.10As shown, the device may also be configured as a computer device including a processor 1001, a memory 1002 (memory), a storage 1003 (storage), a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0185] In the following description, the word "device" may be replaced by "circuit", "device", "unit", etc. The hardware structure of the device may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0186] Each functional block of UE 200 (see Figure 4 ) is implemented by any hardware element or combination of hardware elements of the computer device.

[0187] In addition, each function in UE 200 is implemented by the following method: predetermined software (program) is read into hardware such as processor 1001 and memory 1002, so that processor 1001 performs calculations and controls the communication of communication device 1004 or controls at least one of the reading and writing of data in memory 1002 and storage 1003.

[0188] The processor 1001 controls the entire computer by, for example, executing an operating system. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, a calculation device, a register, and the like.

[0189] In addition, the processor 1001 reads a program (program code), a software module or data, etc. from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and performs various processes accordingly. As a program, a program that causes a computer to perform at least a part of the actions described in the above-mentioned embodiments is used. In addition, with respect to the above-mentioned various processes, although it is described that the above-mentioned various processes are performed by one processor 1001, the above-mentioned various processes can also be performed simultaneously or sequentially by more than two processors 1001. The processor 1001 can also be installed by more than one chip. In addition, the program can also be sent from the network via a telecommunication line.

[0190] The memory 1002 is a computer-readable recording medium, and may be composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), etc. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 may store a program (program code), a software module, etc. that can execute a method according to an embodiment of the present disclosure.

[0191] The memory 1003 is a computer-readable recording medium, and may be composed of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disk (e.g., a compressed disk, a digital versatile disk, a Blu-ray (registered trademark) disk, a smart card, a flash memory (e.g., a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic strip, etc. The memory 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, other appropriate media such as a database, a server, etc. that includes at least one of the memory 1002 and the memory 1003.

[0192] The communication device 1004 is hardware (transceiver) used to communicate between computers via at least one of a wired network and a wireless network, and may also be called a network device, a network controller, a network card, a communication module, etc.

[0193] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., for example, in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0194] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, an LED light, etc.). In addition, the input device 1005 and the output device 1006 may also be integrally formed (e.g., a touch panel).

[0195] In addition, the processor 1001 and the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using different buses for each device.

[0196] In addition, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and a part or all of each functional block may be implemented by the hardware. For example, the processor 1001 may also be installed using at least one of these hardware.

[0197] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information: DCI), uplink control information (Uplink Control Information: UCI)), high-level signaling (e.g., RRC signaling, medium access control (Medium Access Control: MAC) signaling, broadcast information (Master Information Block: MIB, System Information Block: SIB)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0198] Each form / embodiment described in the present disclosure may also be applied to at least one of Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), a system using other appropriate systems, and a next-generation system extended therefrom. In addition, a combination of a plurality of systems (for example, a combination of at least one of LTE and LTE-A with 5G, etc.) may also be applied.

[0199] The processing procedures, timings, processes, etc. of each form / implementation described in this disclosure may be changed in order without contradiction. For example, for the method described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0200] In the present disclosure, specific actions performed by a base station are sometimes performed by its upper node depending on the situation. In a network consisting of one or more network nodes having a base station, various actions performed to communicate with a terminal can be performed by at least one of the base station and other network nodes other than the base station (for example, consider MME or S-GW, etc., but not limited to these). In the above, the case where there is one other network node other than the base station is illustrated, but the other network node may also be a combination of multiple other network nodes (for example, MME and S-GW).

[0201] Information, signals (information, etc.) can be output from a higher layer (or lower layer) to a lower layer (or higher layer), and can also be input or output via multiple network nodes.

[0202] The input or output information can be stored in a specific location (e.g., memory) or managed using a management table. The input or output information can be rewritten, updated, or appended. The output information can also be deleted. The input information can also be sent to other devices.

[0203] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value (Boolean: true or false), or by comparison of numerical values ​​(for example, comparison with a predetermined value).

[0204] Each form / implementation described in the present disclosure may be used alone or in combination, and may be switched depending on the execution. In addition, notification of scheduled information is not limited to being performed explicitly (e.g., notification of "yes X"), but may also be performed implicitly (e.g., notification of the scheduled information is not performed).

[0205] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to commands, sets of commands, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0206] In addition, software, commands, information, etc. may be sent and received via a transmission medium. For example, when software is sent from a web page, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0207] The information, signals, etc. described in the present disclosure may also be represented by any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be involved in the above description as a whole may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0208] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may also be a signal (signaling). In addition, a signal may also be a message. In addition, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0209] As used in this disclosure, the terms "system" and "network" may be used interchangeably.

[0210] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0211] The names used for the above parameters are not limiting in any way. Furthermore, the formulas etc. using these parameters may sometimes differ from those explicitly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by appropriate names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0212] In the present disclosure, the terms "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier" and the like are used interchangeably. Sometimes, a base station is also referred to as a macro cell, a small cell, a micro cell, a pico cell, etc.

[0213] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head: RRH).

[0214] The terms "cell" or "sector" refer to a part or the entirety of a coverage area of ​​at least one of a base station and a base station subsystem that provide communication services within the coverage area.

[0215] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0216] For mobile stations, those skilled in the art sometimes also use the following terms: subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terms.

[0217] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a means of transportation (e.g., a car, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0218] In addition, the base station in the present disclosure may also be replaced by a mobile station (user terminal, the same below). For example, various forms / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a mobile station is replaced by communication between multiple mobile stations (for example, may also be referred to as device-to-device (D2D), vehicle-to-everything (V2X), etc.). In this case, it is also possible to set a structure in which the mobile station has the functions of the base station. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0219] Likewise, the mobile station in the present disclosure may be replaced by a base station. In this case, the base station may have the same functions as the mobile station.

[0220] A radio frame may be composed of one or more frames in the time domain. In the time domain, one or more frames may be referred to as a subframe. A subframe may be composed of one or more time slots in the time domain. A subframe may be a fixed time length (e.g., 1 ms) that is independent of a numerology.

[0221] A parameter set may be a communication parameter applied to at least one of the transmission and reception of a certain signal or channel. The parameter set may, for example, represent at least one of a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame structure, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, and the like.

[0222] A slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. A slot may be a time unit based on a parameter set.

[0223] A time slot may contain multiple mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in units of time greater than a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type B.

[0224] A radio frame, a subframe, a time slot, a mini-time slot, and a symbol all represent time units for transmitting signals. A radio frame, a subframe, a time slot, a mini-time slot, and a symbol may be referred to by other corresponding names.

[0225] For example, 1 subframe can be called a transmission time interval (TTI), multiple consecutive subframes can also be called a TTI, and 1 time slot or 1 mini time slot can also be called a TTI. That is, at least one of the subframe and the TTI can be a subframe (1ms) in the existing LTE, or a period shorter than 1ms (for example, 1-13 code elements), or a period longer than 1ms. In addition, the unit representing TTI can be a time slot, a mini time slot, etc. instead of a subframe.

[0226] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules the allocation of wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI. In addition, the definition of TTI is not limited to this.

[0227] TTI can be a transmission time unit for data packets (transport blocks), code blocks, code words, etc. after channel coding, or a processing unit for scheduling, link adaptation, etc. In addition, when TTI is assigned, the time interval (e.g., the number of symbols) to which the transport block, code block, code word, etc. is actually mapped can be shorter than the TTI.

[0228] In addition, when 1 time slot or 1 mini time slot is called TTI, more than one TTI (ie, more than one time slot or more than one mini time slot) can constitute the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can be controlled.

[0229] A TTI having a time length of 1 ms is also called a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-time slot, a sub-time slot, a time slot, etc.

[0230] In addition, for a long TTI (for example, a normal TTI, a subframe, etc.), it can be replaced with a TTI having a time length exceeding 1ms, and for a short TTI (for example, a shortened TTI, etc.), it can be replaced with a TTI length that is smaller than the long TTI (longTTI) and has a TTI length of more than 1ms.

[0231] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain. In the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers contained in an RB may be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers contained in an RB may also be determined according to the parameter set.

[0232] In addition, the time domain of an RB may include one or more symbols, and may be the length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. 1 TTI, 1 subframe, etc. may be composed of one or more resource blocks, respectively.

[0233] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, and the like.

[0234] In addition, a resource block may be composed of one or more resource elements (RE). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

[0235] A Bandwidth Part (BWP) (also called a partial bandwidth, etc.) represents a subset of contiguous common RBs (common resource blocks) for a parameter set in a certain carrier. Here, a common RB can be identified by the index of the RB based on the common reference point of the carrier. PRBs are defined in a certain BWP and numbered within the BWP.

[0236] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0237] At least one of the set BWPs may be active, and it is not assumed that the UE transmits or receives a predetermined signal / channel outside the activated BWP. In addition, "cell", "carrier" and the like in the present disclosure may be replaced with "BWP".

[0238] The above structures of radio frames, subframes, time slots, mini-time slots, and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots per subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and the like can be changed in various ways.

[0239] The terms "connected", "coupled" or all variations of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, and may include the situation where there is one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" may be used to replace "connection". In the context of the present disclosure, for two elements, it may be considered that they are "connected" or "coupled" to each other by using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-inclusive examples, by using electromagnetic energy having wavelengths in the wireless frequency domain, microwave region, and light (including both visible and invisible) region, etc.

[0240] The reference signal may be referred to as Reference Signal (RS) for short, or may be referred to as a pilot signal depending on the applied standard.

[0241] The phrase "according to" used in the present disclosure does not mean "only according to" unless otherwise expressly stated. In other words, the phrase "according to" means both "only according to" and "at least according to".

[0242] The "unit" in the configuration of each of the above-mentioned devices may be replaced with a "section", "circuit", "device" or the like.

[0243] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not necessarily limit the number and order of these elements. These terms are used in this disclosure as a simple method to distinguish between two or more elements. Therefore, a reference to a first and a second element does not mean that only two elements can be used here or that the first element must precede the second element in any form.

[0244] When the terms "include," "including," and variations thereof are used in the present disclosure, these terms are intended to be inclusive, as is the term "comprising." Furthermore, the term "or" used in the present disclosure does not mean an exclusive or.

[0245] In the present disclosure, when an article is added by translation, such as a, an, and the in English, for example, the present disclosure also includes the case where the noun following the article is in plural form.

[0246] The terms "determining" and "determining" used in the present disclosure sometimes also include situations of various actions. "Determining" and "determining" may include, for example, considering matters that have been judged, calculated, calculated, processed, derived, investigated, searched (for example, searched in a table, database or other data structure), confirmed (ascertaining) as matters that have been "judged" or "determined", etc. In addition, "determining" and "determining" may include considering matters that have been received (for example, receiving information), transmitted (for example, transmitting information), input, output, accessed (for example, accessed data in memory) as matters that have been "judged" or "determined", etc. In addition, "determining" and "determining" may include considering matters that have been resolved (resolving), selected (selecting), chosen (choosing), established (establishing), compared (comparing), etc. as matters that have been "judged" or "determined". That is, "determining" and "determining" may include matters that have been "judged" or "determined" by any action. In addition, the word “determine” can also be replaced by “assuming”, “expecting”, “considering”, etc.

[0247] In the present disclosure, the term "A and B are different" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same way as "different".

[0248] The present disclosure is described in detail above, but it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as a modification and variation without departing from the subject matter and scope of the present disclosure as determined by the claims. Therefore, the purpose of the description of the present disclosure is to illustrate and not to have any limiting meaning on the present disclosure.

[0249] Description of labels:

[0250] 10 Wireless Communication Systems

[0251] 20 NG-RAN

[0252] 100A,100B gNB

[0253] 200 UE

[0254] 210 Wireless signal transceiver

[0255] 220 Amplifier

[0256] 230 Modem Unit

[0257] 240 Control signal and reference signal processing unit

[0258] 250 Encoding / Decoding Unit

[0259] 260 Data Transceiver

[0260] 270 Control Department

[0261] 1001 Processor

[0262] 1002 Memory

[0263] 1003 Memory

[0264] 1004 Communication devices

[0265] 1005 Input Device

[0266] 1006 Output Device

[0267] 1007 Bus

Claims

1. A terminal, wherein: The terminal has: a receiving unit that receives downlink control information for uplink scheduling including information of an uplink reference signal; and a control unit that performs a channel access procedure in an unlicensed frequency band, The control unit determines a beam to be used for the channel access procedure based on information of the uplink reference signal.

2. The terminal according to claim 1, wherein: The control unit assumes that the beam used for the channel access process is associated with the beam for uplink transmission.

3. A wireless communication method for a terminal, wherein: The wireless communication method comprises the following steps: receiving downlink control information for scheduling of uplink including information of uplink reference signal; and performing a channel access procedure in an unlicensed frequency band, In the execution step, a beam used for the channel access process is determined based on information of the uplink reference signal.

4. A wireless communication system, comprising a wireless base station and a terminal, wherein: The radio base station includes a transmission unit configured to transmit downlink control information for uplink scheduling including information on an uplink reference signal. The terminal has: A receiving unit, which receives the downlink control information; as well as a control unit that performs a channel access procedure in an unlicensed frequency band, The control unit determines a beam to be used for the channel access procedure based on information of the uplink reference signal.

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