Base stations, terminals, and communication methods

Abstract

Apply wireless communication systems to high-frequency bands. [Solution] The base station is a base station capable of communication in a high-frequency band including an unlicensed band, and comprises a transmitting unit that performs a first downlink transmission and a second downlink transmission transmitted after the first downlink transmission, and a control unit that controls channel access for which the detection period is variable, wherein when the transmitting unit starts channel occupancy due to the channel access, it performs the first downlink transmission and the second downlink transmission during a predetermined period of channel occupancy, and when the transmitting unit performs the second downlink transmission during the predetermined period, the control unit does not perform the detection before performing the second downlink transmission.

Description

Technical Field

[0001] The present invention relates to a base station, a terminal, and a communication method in a wireless communication system.

Background Art

[0002] In NR (New Radio), which is a successor system to LTE (Long Term Evolution) (also referred to as "5G"), technologies that satisfy requirements such as a large-capacity system, high data transmission speed, low latency, simultaneous connection of a large number of terminals, low cost, and power saving are being studied (for example, Non-Patent Document 1).

[0003] In NR Release 17, using a higher frequency band than conventional releases (for example, Non-Patent Document 2) is being studied. For example, applicable numerology including subcarrier spacing, channel bandwidth, etc. in the frequency band from 52.6 GHz to 71 GHz, the design of the physical layer, and obstacles assumed in actual wireless communication are being studied.

[0004] Also, in NR, a wireless communication system using LBT (Listen Before Talk) and transmission bursts is being studied. LBT is a mechanism for attempting communication mainly in an unlicensed band to confirm whether the target communication is possible. A transmission burst is a set of transmission signals from the same transmission source at intervals not exceeding a specific threshold.

Prior Art Documents

Non-Patent Documents

[0005]

Non-Patent Document 1

Non-Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0006] There is a problem in that specifications for applying wireless communication systems to high frequency bands are not defined. For example, LBTs are being considered in the unlicensed bands of high frequency ranges such as 52.6 GHz to 71 GHz, but the detection period for LBTs is not defined. Since the definition of a transmit burst needs to be related to the detection period of LBTs, if the definition of a transmit burst remains the same as before, it may not be compatible with the LBT specifications.

[0007] This invention has been made in view of the above points, and aims to apply wireless communication systems to high-frequency bands. [Means for solving the problem]

[0008] According to the disclosed technology, a base station is a base station capable of communicating in a high-frequency band including an unlicensed band, and comprises a transmitting unit that performs a first downlink transmission and a second downlink transmission transmitted after the first downlink transmission, and a control unit that controls channel access for which the detection period is variable, wherein when the transmitting unit starts channel occupancy due to the channel access, it performs the first downlink transmission and the second downlink transmission during a predetermined period of channel occupancy, and when the transmitting unit performs the second downlink transmission during the predetermined period, the control unit does not perform the detection before performing the second downlink transmission. [Effects of the Invention]

[0009] The disclosed technology provides a method for applying wireless communication systems to high-frequency bands. [Brief explanation of the drawing]

[0010] [Figure 1] This figure illustrates a wireless communication system according to an embodiment of the present invention. [Figure 2] This figure shows an example of a frequency range according to an embodiment of the present invention. [Figure 3]This is the first diagram illustrating the LBT specification in NR Release 16. [Figure 4] This is the second diagram illustrating the LBT specification in NR Release 16. [Figure 5] This is the third diagram illustrating the LBT specification in NR Release 16. [Figure 6] This is the first diagram illustrating the LBT specification in NR Release 17. [Figure 7] This is the first diagram illustrating the relationship between LBT and COT in NR Release 16. [Figure 8] This is the second diagram illustrating the relationship between LBT and COT in NR Release 16. [Figure 9] This is the third diagram illustrating the relationship between LBT and COT in NR Release 16. [Figure 10] This is the first diagram illustrating the transmit burst in NR Release 16. [Figure 11] This is the second diagram illustrating the transmit burst in NR Release 16. [Figure 12] This is the first diagram illustrating the transmission burst related to Option 1 of Example 2. [Figure 13] This is a second diagram illustrating the transmission burst related to Option 1 of Example 2. [Figure 14] This diagram illustrates the intervals between the two transmission bursts in Example 4. [Figure 15] This figure shows an example of the functional configuration of a base station according to an embodiment of the present invention. [Figure 16] This figure shows an example of the functional configuration of a terminal according to an embodiment of the present invention. [Figure 17] This figure shows an example of the hardware configuration of a base station or terminal according to an embodiment of the present invention. [Figure 18] This figure shows an example of the configuration of a vehicle according to an embodiment of the present invention.

Embodiment for Carrying Out the Invention

[0011] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

[0012] In the operation of the wireless communication system according to the embodiment of the present invention, existing technologies may be used as appropriate. The existing technologies are, for example, existing NR or LTE, but are not limited to existing NR or LTE. In addition, the term "LTE" used in this specification shall have a broad meaning including LTE-Advanced and subsequent systems (e.g., NR) unless otherwise specified.

[0013] In addition, in the embodiments of the present invention described below, terms such as SS (Synchronization signal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical random access channel), PDCCH (Physical Downlink Control Channel), PDSCH (Physical Downlink Shared Channel), PUCCH (Physical Uplink Control Channel), PUSCH (Physical Uplink Shared Channel), etc., which are used in existing LTE, are used. This is for convenience of description, and signals, functions, etc. similar to these may be called by other names. Also, the above terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even for signals used in NR, the "NR-" is not necessarily specified.

[0014] Furthermore, in the embodiments of the present invention, the duplex method may be a TDD (Time Division Duplex) method, an FDD (Frequency Division Duplex) method, or any other method (for example, a Flexible Duplex).

[0015] Furthermore, in the embodiments of the present invention, "configuring" wireless parameters, etc., may mean that predetermined values ​​are pre-configured, or that wireless parameters notified from a base station or terminal are configured.

[0016] (System Configuration) Figure 1 is a diagram illustrating an embodiment of the wireless communication system according to the present invention. A wireless communication system according to an embodiment of the present invention includes a base station 10 and a terminal 20, as shown in Figure 1. Although Figure 1 shows one base station 10 and one terminal 20, this is an example, and there may be multiple base stations 10 and terminal 20.

[0017] Base station 10 is a communication device that provides one or more cells and performs wireless communication with terminal 20. The physical resources of the wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols, and the frequency domain may be defined by the number of subcarriers or resource blocks. In addition, the TTI (Transmission Time Interval) in the time domain may be a slot, or the TTI may be a subframe.

[0018] The base station 10 transmits synchronization signals and system information to the terminal 20. The synchronization signals are, for example, NR-PSS and NR-SSS. The system information is transmitted, for example, via NR-PBCH and is also called broadcast information. The synchronization signals and system information may also be called SSB (SS / PBCH block). As shown in Figure 1, the base station 10 transmits control signals or data to the terminal 20 via DL (Downlink) and receives control signals or data from the terminal 20 via UL (Uplink). Both the base station 10 and the terminal 20 are capable of transmitting and receiving signals using beamforming. Furthermore, both the base station 10 and the terminal 20 are capable of applying MIMO (Multiple Input Multiple Output) communication to DL or UL. In addition, both the base station 10 and the terminal 20 may communicate via secondary cells (SCell) and primary cells (PCell) using CA (Carrier Aggregation). Furthermore, terminal 20 may communicate via the primary cell of base station 10 and the primary secondary cell group cell (PSCell: Primary SCG Cell) of other base stations 10 using DC (Dual Connectivity).

[0019] Terminal 20 is a communication device equipped with wireless communication capabilities, such as a smartphone, mobile phone, tablet, wearable device, or M2M (Machine-to-Machine) communication module. As shown in Figure 1, Terminal 20 receives control signals or data from the base station 10 via DL and transmits control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system. Terminal 20 also receives various reference signals transmitted from the base station 10 and performs propagation path quality measurements based on the reception results of these reference signals. Terminal 20 may also be referred to as UE and base station 10 as gNB.

[0020] Figure 2 shows an example of frequency ranges according to an embodiment of the present invention. The NR specifications of 3GPP Release 15 and Release 16 consider operating in frequency bands above 52.6 GHz, for example. As shown in Figure 2, the currently defined frequency range FR (Frequency range) 1 is from 410 MHz to 7.125 GHz, with a Subcarrier Spacing (SCS) of 15, 30, or 60 kHz and a bandwidth of 5 MHz to 100 MHz. FR2-1 is from 24.25 GHz to 52.6 GHz, with an SCS of 60, 120, or 240 kHz and a bandwidth of 50 MHz to 400 MHz. Furthermore, the newly introduced frequency band, FR2-2, is from 52.6 GHz to 71 GHz.

[0021] In the newly operated frequency band FR2-2, up to 64 SSB beams may be supported in both the licensed and unlicensed bands. Furthermore, in the initial Bandwidth Part (BWP), 120kHz SCS for SSB and 120kHz SCS for initial access signals and channels may be supported.

[0022] In addition to 120kHz SCS, SSB at 480kHz SCS may be supported. This SSB may enable initial access to support CORESET (Control Resource Set)#0 / Type0-PDCCH included in the MIB. However, the following limitations may apply: For example, the entry number of the synchronization raster may be restricted. Also, in the case of 480kHz SCS SSB, only 480kHz SCS CORESET#0 / Type0-PDCCH may be supported. Furthermore, SSB-CORESET multiplexing pattern 1 (SS / PBCH block and CORESET multiplexing pattern 1) may be preferred.

[0023] It may be supported to uniquely identify the ANR (Automatic Neighbor Relation) and PCI (Physical Cell Identity) for detecting 120kHz SCS, 480kHz SCS, and 960kHz SCS SSBs. Furthermore, CORESET#0 / Type0-PDCCH included in the MIB of 120kHz SCS, 480kHz SCS, and 960kHz SSBs may be supported. Additionally, one CORESET#0 / Type0-PDCCH SCS may be supported per SSB SCS. For example, {SSB SCS, CORESET#0 / Type0-PDCCH SCS} may support {120,120}, {480,480}, and {960,960}. Furthermore, SSB-CORESET multiplexing pattern 1 may be preferred.

[0024] Next, we will explain the specifications for Listen Before Talk (LBT) as defined in NR Release 16. LBT is a mechanism that attempts to communicate in order to confirm whether the intended communication is possible, mainly in unlicensed bandwidth.

[0025] NR Release 16 specifies the following four types of LBTs in the 5GHz unlicensed band:

[0026] Type 1 is LBT with random backoff using a variable-size competition window.

[0027] Figure 3 is the first diagram illustrating the LBT specification in NR Release 16. Type 1 LBTs, as shown in Figure 3, expand the competition window size (CWS) when a collision-induced error is detected. Additionally, the backoff counter is frozen while the channel is busy.

[0028] Types 2A and 2B are LBTs without random backoff.

[0029] Figure 4 is a second diagram illustrating the LBT specifications in NR Release 16. Type 2A LBTs are required if the interval between a transmission and another transmission is 25 μs or more. Type 2B LBTs are required if the interval between a transmission and another transmission is 16 μs or more.

[0030] Figure 5 is a third diagram illustrating the LBT specification in NR Release 16. Type 2C LBTs, as shown in Figure 5, are specified as not requiring an LBT if the interval between transmissions is less than 16 μs. In this case, the transmission duration is a maximum of 584 μs.

[0031] Next, we will describe the LBT specifications in NR Release 17.

[0032] For the FR2-2 frequency band in NR Release 17, a Type 1 (Category 3) LBT with random backoff is being considered.

[0033] Figure 6 is the first diagram illustrating the LBT specification in NR Release 17. The detection period for the LBT with random backoff considered in NR Release 17 is "8 μs + random counter × 5 μs". That is, when terminal 20 detects channel busy in the "5 μs" window, it freezes the random counter and observes another "8 μs + random counter × 5 μs" window. The random counter is an integer from 0 to 3. Therefore, the maximum LBT detection period is 8 μs + 3 × 5 μs = 23 μs.

[0034] Furthermore, NR Release 17 also considers LBT for Category 2 (Fixed Detection Period). For COT sharing from initiating device transmission to responding device transmission, supporting both of the following two options is being considered:

[0035] <Alternative 1> There is no defined maximum interval between the initiating device's transmission and the responding device's transmission. Responding device transmissions with intervals within the maximum COT period can occur without LBT.

[0036] <Alternative 2> A maximum interval Y is defined, and the response device transmission occurs without LBT only if the transmission starts within Y from the end of the initiating device transmission. If the response device transmission starts after Y from the end of the initiating device transmission, a Category 2 LBT is required before the response device transmission. Note that Category 2 LBT uses the same 8us initial delay period and sensing structure as eCCA. Furthermore, the following options can be selected.

[0037] Option 1: Y=8us (Motivated by the need to be active in all regions).

[0038] Option 2: Y = Multiple OFDM symbols Option 3: The base station determines Y (for example, according to local regulations).

[0039] Furthermore, Category 2 LBTs depend on terminal capabilities. The choice of the two options depends on the base station selection and, at least, on local regulations.

[0040] Next, we will explain the relationship between LBT and COT in NR Release 16. COT is a mechanism that allows terminals and base stations to share a period during which they can transmit without LBT. In the unlicensed band of NR Release 16, COT sharing between base stations and terminals is permitted under several restrictions (transmission period, transmit signal / channel type, priority class, etc.).

[0041] If the parameter "availableRB-SetPerCell-r16" is set in the upper layer, available RB set indicator 1, available RB set indicator 2, ..., available RB set indicator N1 will be used.

[0042] Furthermore, if the parameter "CO-DurationPerCell-r16" is set in the upper layer, COT duration indicator 1, COT duration indicator 2, ..., COT duration indicator N2 will be used.

[0043] Figure 7 is the first diagram illustrating the relationship between LBT and COT in NR Release 16. The LBE method is a type of transmission method that allows arbitrary transmission. In this case, transmission is not permitted until the backoff counter reaches 0. For example, a Type 2A LBT is performed at the start of a discovery burst with a duration of less than 1 ms and a duty cycle of less than 1 / 20.

[0044] Figure 8 is a second diagram illustrating the relationship between LBT and COT in NR Release 16. The FBE scheme is a type of transmission that transmits periodically. In this case, if LBT is busy, transmission between COTs is not permitted.

[0045] Figure 9 is a third diagram illustrating the relationship between LBT and COT in NR Release 16. The COT period (CO structure (available LBT subbands, COT period)) is shown to the terminal group via DCI format 2_0.

[0046] Next, we will discuss the transmit burst in NR Release 16.

[0047] A DL transmit burst is defined as a set of transmissions from a base station at intervals not exceeding 16 μs. A UL transmit burst is defined as a set of transmissions from a terminal at intervals not exceeding 16 μs. The "16 μs" comes from the minimum sensing time for LBTs supported in the unlicensed band in NR Release 16.

[0048] Figure 10 is the first diagram illustrating the transmit burst in NR release 16. When the interval between two transmits is less than 16 μs, the two transmits constitute a single transmit burst, and LBT is not required for the subsequent transmit 2.

[0049] Figure 11 is a second diagram illustrating the transmit burst in NR release 16. When the interval between two transmits is 16 μs or more, the two transmits become separate transmit bursts, and LBT is required for the subsequent transmit 2.

[0050] (Previous problems) Given the following circumstances, the definition of a transmit burst is unclear in the FR2-2 frequency band from 52.6 to 71 GHz. Specifically, the use of Category 3 LBTs (LBTs with random backoff, where the range of possible backoffs is fixed) and Category 2 LBTs (LBTs without random backoff) is being considered in the FR2-2 frequency band. However, since the detection period for Category 2 LBTs is not specified, there is no provision for how to define a transmit burst in relation to the LBT detection period.

[0051] Furthermore, Japanese regulations state that if Category 2 LBTs are to be used, "sensing is required to initiate transmission at a transmit power exceeding a certain threshold."

[0052] Furthermore, while there are no other regulations that require LBT itself, LBT is still useful in ensuring better coexistence.

[0053] (Summary of this embodiment) Therefore, in order to solve the conventional problems described above, we will explain the definition of intervals having one or more types of various periods for NR operation in the FR2-2 frequency band (52.6-71 GHz). Below, we will describe specific examples of this embodiment, from Example 1 to Example 5.

[0054] (Example 1) In this embodiment, the definition of the precise duration of the allowable interval within a transmit burst is described. Terminal 20 or base station 10 performs LBT on the first transmit within a transmit burst, but does not perform LBT on subsequent transmits within the transmit burst, provided that the duration is within the defined duration as follows.

[0055] <Option 1> The exact duration of the allowable interval within a transmit burst may be defined as one of the following:

[0056] <Option 1-1> The exact duration of the allowable interval within a transmit burst may be defined as a single fixed period X. The unit of X may be (μ)s or symbols (slots).

[0057] <Specific Example 1> Let X be 8 μs (considering the minimum detection period available for Category 3 LBT).

[0058] <Specific Example 2> Let X be Y. This is the same as the allowable interval for non-LBT transmissions from the response device within the COT. Y may also be the same as 8 μs.

[0059] <Specific Example 3> Let X be Z. This is the same as the transient period for 52.6-71 GHz (FR2-2). Alternatively, it may be set to 5 μs according to the specifications for FR2-1 (24.25-52.6 GHz).

[0060] <Specific Example 4> X is set to 8.93 μs, taking into account blank symbols to allow for a temporary period. This corresponds to the symbol length of a 120 kHz SCS.

[0061] <Specific Example 5> X represents a single symbol for 480 / 960 kHz, i.e., 4.47 / 2.24 μs.

[0062] <Specific Example 6> X shall be at least one combination of Specific Examples 1 through 5.

[0063] <Option 1-2> The exact duration of the allowable interval within a transmission burst may be a set of multiple fixed periods X0, X1, ... Each X i (i=0,1,···) may be any of the specific examples shown in Option 1-1.

[0064] (Example 2) In this example, downlink / uplink transmit bursts based on "interval" are described. Terminal 20 or base station 10 performs LBT in the first transmit within a downlink / uplink transmit burst, but does not perform LBT in subsequent transmits within the transmit burst.

[0065] <Option 1> Downlink / uplink transmit bursts may be defined as "a set of transmits with no interval of G1 or greater."

[0066] Figure 12 is the first diagram illustrating the transmit burst related to Option 1 of Example 2. When the interval between two transmits is less than G1, the two transmits become a single transmit burst, and LBT is not required for the subsequent transmit 2.

[0067] Figure 13 is a second diagram illustrating the transmit burst related to Option 1 of Example 2. When the interval between two transmissions is G1 or greater, the two transmissions become separate transmit bursts, and LBT is required for the subsequent transmission 2.

[0068] Note that in both Figure 12 and Figure 13, transmission 1 and transmission 2 are signals transmitted from the same device.

[0069] <Option 1-1> The relationship between uplink transmit bursts and downlink transmit bursts with respect to "interval" may be as follows:

[0070] Firstly, the interval X may be the same between the uplink transmit burst and the downlink transmit burst.

[0071] Secondly, the interval X may differ between the uplink transmit burst and the downlink transmit burst.

[0072] <Option 1-2> The exact value of G1 may be specified. G1 may be any of the specific examples shown in Option 1-1 of Example 1.

[0073] (Example 3) In this embodiment, the transmission operation of terminal 20 or base station 10 within a transmission burst will be described.

[0074] When multiple transmissions from a device (terminal 20 or base station 10) are multiplexed without an interval greater than the allowable interval, the operation may be one of the following: In this case, the multiple transmissions are treated as a single transmission burst.

[0075] <Option 1> Terminal 20 or base station 10 may perform LBT only to initiate the first transmission. In other words, terminal 20 or base station 10 does not need to perform LBT to initiate other transmissions.

[0076] <Option 1'> Terminal 20 or base station 10 may perform LBT to initiate at least the first transmission. For other transmissions, terminal 20 or base station 10 may decide whether to perform LBT and, if necessary, which LBT to perform, depending on the LBT results of previous transmissions.

[0077] <Option 1'-1> If the LBT result for the previous transmission was successful, the terminal 20 or base station 10 does not need to perform LBT for subsequent transmissions.

[0078] <Option 1'-2> If the LBT result in the previous transmission failed, the terminal 20 or base station 10 may perform LBT in a subsequent transmission.

[0079] <Option 2> The terminal 20 or base station 10 may perform various types of LBT for various transmissions within a transmission burst.

[0080] <Option 2-1> Terminal 20 or base station 10 may perform LBT with random backoff (i.e., Category 3 LBT) for the first transmission. Terminal 20 or base station 10 may perform LBT without random backoff (i.e., Category 2 LBT) for all other transmissions.

[0081] <Option 2-2> Terminal 20 or base station 10 may perform a random backoff-less LBT to initiate transmission if a previous LBT for initiating transmission was successful. Alternatively, terminal 20 or base station 10 may perform a random backoff-based LBT if all previous LBTs for initiating transmission have failed.

[0082] This option may also be supported in conjunction with the conditions shown in Option 1 of Example 2.

[0083] (Example 4) In this embodiment, we describe an example in which terminal 20 or base station 10 determines the LBT type of a transmit burst based on its time-domain relationship with another previous transmit burst.

[0084] <Option 1> The "time-domain relationship with another previous transmission burst" may be at least one of the following:

[0085] Figure 14 is a diagram illustrating the intervals between the two transmission bursts in Example 4.

[0086] <Option 1-1> The "time-domain relationship with another previous transmit burst" may be the interval between the end of the other previous transmit burst (transmit burst 1 in Figure 14) and the start of the initiated transmit burst (transmit burst 2 in Figure 14).

[0087] <Option 1-2> The "time-domain relationship with another previous transmit burst" may be the interval between the start of another previous transmit burst (transmit burst 1 in Figure 14) and the start of the transmitted burst that has just been initiated (transmit burst 2 in Figure 14).

[0088] <Options 1-3> The "time-domain relationship with another previous transmit burst" may be the interval between the end of the other previous transmit burst (transmit burst 1 in Figure 14) and the end of the initiated transmit burst (transmit burst 2 in Figure 14).

[0089] <Option 2> The transmitting device for each transmit burst may be any of the following:

[0090] <Option 2-1> Transmit burst 1 and transmit burst 2 may be initiated by the same device.

[0091] <Option 2-2> Transmit burst 1 and transmit burst 2 may be initiated by different devices.

[0092] <Option 3> A threshold value (G2) for comparison may be defined. G2 may be the same as or different from G1. One or more values ​​may be defined as G2. Also, G2 may be any of the specific examples shown in Option 1-1 of Example 1.

[0093] (Example 5) In this embodiment, the transmission operation of terminal 20 or base station 10 in separate transmission bursts will be described.

[0094] When multiple transmissions from a device (terminal 20 or base station 10) are multiplexed with intervals exceeding the allowable interval, the operation may be one of the following: In this case, the multiple transmissions are treated as separate transmission bursts.

[0095] <Option 1> Terminal 20 or base station 10 may perform LBT only to initiate the first transmission. In other words, terminal 20 or base station 10 does not need to perform LBT to initiate other transmissions.

[0096] This option may be permitted only if certain conditions are met.

[0097] <Example Condition 1> The condition may be that the time elapsed from the LBT to the first transmission (MCOT) is less than or equal to a specified value. For example, this specified value may be 5ms.

[0098] <Example Condition 2> The condition may depend on the HARQ-ACK of a previous transmission. For example, if the number / ratio of positive HARQ-ACKs of a previous transmission is a certain number / ratio, terminal 20 or base station 10 performs LBT for the desired transmission. Otherwise, terminal 20 or base station 10 performs LBT.

[0099] If certain conditions are not met, the operation of the terminal 20 or base station 10 to initiate another transmission is the same as the operation of the initial transmission.

[0100] The specific conditions described above may be predetermined in the specifications, or they may be set from the base station 10 to the terminal 20 via RRC. The terminal 20 may also receive a designation via MAC-CE or DCI and select specific conditions from a set of conditions.

[0101] <Option 1'> Terminal 20 or base station 10 may perform LBT to initiate at least the first transmission. For other transmissions, terminal 20 or base station 10 may decide whether to perform LBT and, if necessary, which LBT to perform, depending on the LBT results of previous transmissions.

[0102] <Option 1'-1> If the LBT result for the previous transmission was successful, the terminal 20 or base station 10 does not need to perform LBT for subsequent transmissions.

[0103] <Option 1'-2> If the LBT result in the previous transmission failed, the terminal 20 or base station 10 may perform LBT in a subsequent transmission.

[0104] <Option 2> The terminal 20 or base station 10 may perform various types of LBT for various transmissions or transmission bursts.

[0105] <Option 2-1> Terminal 20 or base station 10 may perform LBT with random backoff (i.e., Category 3 LBT) for the first transmission. Terminal 20 or base station 10 may perform LBT without random backoff (i.e., Category 2 LBT) for all other transmissions.

[0106] <Option 2-2> Terminal 20 or base station 10 may perform a random backoff-less LBT to initiate transmission if a previous LBT for initiating transmission was successful. Alternatively, terminal 20 or base station 10 may perform a random backoff-based LBT if all previous LBTs for initiating transmission have failed.

[0107] This option may also be supported in conjunction with the conditions shown in Option 1 of Example 2.

[0108] <Options 2-3> The terminal 20 or base station 10 may decide on its operation based on the result of comparing the interval with the threshold G2.

[0109] <Specific Example 1> Terminal 20 or base station 10 will not perform LBT on the initiated transmission if the interval between the end of the previous transmission (or transmission burst) and the initiated transmission (or transmission burst) is less than or equal to threshold G2. Alternatively, terminal 20 or base station 10 will perform LBT (with or without random backoff) if the interval between the end of the previous transmission (or transmission burst) and the initiated transmission (or transmission burst) is greater than threshold G2.

[0110] <Specific Example 2> Terminal 20 or base station 10 performs LBT without random backoff for the initiated transmission if the interval between the end of the previous transmission (or transmission burst) and the initiated transmission (or transmission burst) is G2 or less. Also, terminal 20 or base station 10 performs LBT with random backoff if the interval between the end of the previous transmission (or transmission burst) and the initiated transmission (or transmission burst) is greater than G2.

[0111] Terminal 20 may select the options of each embodiment described above according to RRC settings, MAC-CE instructions, DCI instructions, or combinations thereof.

[0112] The method according to this embodiment may be limited to a specific frequency band (e.g., FR2-2), limited to an unlicensed frequency band, or limited to a specific subcarrier interval (at least one of the subcarrier intervals of 480kHz and 960kHz). Alternatively, a combination of the above limitations may be used.

[0113] QCL may refer to any of the following: "typeA", "typeB", "typeC", and "typeD".

[0114] Each of the embodiments or options described above may be applied to each cell / bandwidth / BWP.

[0115] LBT may be at least one of Type 1 LBT (i.e., detection by backoff) and Type 2 LBT (i.e., detection by fixed period).

[0116] The method according to this embodiment may be limited to terminals (or IAB nodes with terminal functionality) that have transmitted a specific terminal capability signaling. For example, it may be limited to terminals that have reported supporting at least one of the operations of Examples 1 to 5.

[0117] (Device configuration) Next, we will describe an example of the functional configuration of the base station 10 and terminal 20 that perform the processes and operations described above. The base station 10 and terminal 20 include functions to perform the embodiments described above. However, the base station 10 and terminal 20 may each be equipped with only one of the proposed functions from the embodiments.

[0118] <Base station 10> Figure 15 shows an example of the functional configuration of a base station. As shown in Figure 15, the base station 10 has a transmitting unit 110, a receiving unit 120, a setting unit 130, and a control unit 140. The functional configuration shown in Figure 15 is merely an example. The names of the functional categories and functional units can be anything as long as they can perform the operations according to the embodiment of the present invention. The transmitting unit 110 and the receiving unit 120 may be called the communication unit.

[0119] The transmitting unit 110 includes the function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiving unit 120 includes the function of receiving various signals transmitted from the terminal 20 and obtaining information from the received signals, for example, information of a higher layer. The transmitting unit 110 also has the function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL data, etc. to the terminal 20. The transmitting unit 110 also transmits setting information, etc., as described in the embodiment.

[0120] The setting unit 130 stores pre-configured setting information and various setting information to be transmitted to the terminal 20 in a storage device and reads it from the storage device as needed. The control unit 140 performs control of the entire base station 10, including control related to signal transmission and reception. The signal transmission function unit of the control unit 140 may be included in the transmission unit 110, and the signal reception function unit of the control unit 140 may be included in the reception unit 120. The transmission unit 110 and the reception unit 120 may also be called the transmitter and receiver, respectively.

[0121] <Terminal 20> Figure 16 shows an example of the functional configuration of a terminal. As shown in Figure 16, the terminal 20 has a transmitting unit 210, a receiving unit 220, a setting unit 230, and a control unit 240. The functional configuration shown in Figure 16 is merely an example. The names of the functional categories and functional units can be anything as long as they can perform the operations according to the embodiment of the present invention. The transmitting unit 210 and the receiving unit 220 may be called the communication unit.

[0122] The transmitting unit 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiving unit 220 wirelessly receives various signals and obtains signals from higher layers from the received physical layer signals. The transmitting unit 210 also transmits a HARQ-ACK, and the receiving unit 220 receives the configuration information and the like as described in the embodiment.

[0123] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220 in a storage device and reads it from the storage device as needed. The setting unit 230 also stores pre-set setting information. The control unit 240 controls the entire terminal 20, including control related to signal transmission and reception. The signal transmission function in the control unit 240 may be included in the transmission unit 210, and the signal reception function in the control unit 240 may be included in the reception unit 220. The transmission unit 210 and the reception unit 220 may also be called the transmitter and receiver, respectively.

[0124] The terminal or base station of this embodiment may be configured as one of the terminals or base stations described in the following sections. Furthermore, the following communication methods may be implemented.

[0125] <Configuration of this embodiment> (Section 1) A base station capable of communication in high-frequency bands including unlicensed bands, A transmitting unit that performs a first downlink transmission and a second downlink transmission that is transmitted after the first downlink transmission, It includes a control unit that controls channel access with a variable detection period, When the transmitting unit initiates channel occupancy due to channel access, it performs the first downlink transmission and the second downlink transmission during a predetermined period of channel occupancy. A base station in which, when the transmitting unit performs the second downlink transmission during the predetermined period, the control unit does not perform the detection before performing the second downlink transmission. (Section 2) The base station described in paragraph 1, wherein the predetermined period is 5 ms. (Section 3) A base station capable of communication in high-frequency bands including unlicensed bands, A transmitting unit that performs a first downlink transmission and a second downlink transmission that is transmitted after the first downlink transmission, It includes a control unit that controls channel access with a variable detection period, When the transmitting unit initiates channel occupancy due to channel access, it performs the first downlink transmission and the second downlink transmission during a predetermined period of channel occupancy. The control unit controls whether or not to perform the detection before the second downlink transmission, based on the interval between the end of the first downlink transmission and the start of the second downlink transmission, at the base station. (Section 4) A terminal capable of communication in high-frequency bands, including unlicensed bands, A transmitting unit that performs a first uplink transmission and a second uplink transmission to be transmitted after the first uplink transmission, It includes a control unit that controls channel access with a variable detection period, When the transmitting unit initiates channel occupancy through channel access, it performs the first uplink transmission and the second uplink transmission during a predetermined period of channel occupancy. A terminal in which, when the transmitting unit performs the second uplink transmission within the predetermined period, the control unit does not perform the detection before performing the second uplink transmission. (Section 5) A terminal capable of communication in high-frequency bands, including unlicensed bands, A transmitting unit that performs a first uplink transmission and a second uplink transmission to be transmitted after the first uplink transmission, It includes a control unit that controls channel access with a variable detection period, When the transmitting unit initiates channel occupancy through channel access, it performs the first uplink transmission and the second uplink transmission during a predetermined period of channel occupancy. The control unit controls whether or not to perform the detection before the second uplink transmission, based on the interval between the end of the first uplink transmission and the start of the second uplink transmission. (Section 6) A communication method performed by a base station capable of communicating in high-frequency bands including unlicensed bands, A transmission step that includes performing a first downlink transmission and a second downlink transmission that is transmitted after the first downlink transmission, The system includes a control step for controlling channel access, where the detection period is variable. The transmission step, when channel occupancy is initiated by channel access, performs the first downlink transmission and the second downlink transmission during a predetermined period of channel occupancy. A communication method wherein, if the second downlink transmission is performed during the predetermined period, the control step does not perform the detection before the second downlink transmission.

[0126] Any of the above configurations provides a technology that enables the application of wireless communication systems to high-frequency bands.

[0127] (Hardware configuration) The block diagrams (Figures 15 and 16) used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may be realized by combining the one or more devices with software.

[0128] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. As mentioned above, the method of implementation is not particularly limited.

[0129] For example, the base station 10, terminal 20, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 17 is a diagram showing an example of the hardware configuration of the base station 10 and terminal 20 according to one embodiment of the present disclosure. The above-mentioned base station 10 and terminal 20 may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0130] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the base station 10 and terminal 20 may include one or more of the devices shown in the figure, or it may be configured without some of the devices.

[0131] Each function in the base station 10 and terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and storage device 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of the reading and writing of data in the storage device 1002 and auxiliary storage device 1003.

[0132] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic units, registers, etc. For example, the control unit 140, control unit 240, etc., described above may be implemented by the processor 1001.

[0133] Furthermore, the processor 1001 reads programs (program code), software modules, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes accordingly. The program used is one that causes a computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 140 of the base station 10 shown in Figure 15 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in Figure 16 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Although the above processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunications line.

[0134] The storage device 1002 is a computer-readable recording medium and may consist of at least one of the following: ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may also be called a register, cache, main memory, etc. The storage device 1002 can store executable programs (program code), software modules, etc., for implementing a communication method according to one embodiment of this disclosure.

[0135] The auxiliary storage device 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disc, a digital multipurpose disc, a Blu-ray® disc), a smart card, flash memory (e.g., a card, a stick, a key drive), a floppy® disk, a magnetic strip, etc. The above-mentioned storage medium may also be a database, server, or other suitable medium that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0136] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may include high-frequency switches, duplexers, filters, frequency synthesizers, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the transmit / receive antenna, amplifier section, transmit / receive section, transmission path interface, etc., may be implemented by the communication device 1004. The transmit / receive section may be implemented with physically or logically separated transmitting and receiving sections.

[0137] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0138] Furthermore, each device, such as the processor 1001 and the storage device 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0139] Furthermore, the base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and some or all of each functional block may be realized by such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0140] Figure 18 shows an example of the configuration of vehicle 2001. As shown in Figure 18, vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021-2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in this disclosure may be applied to a communication device mounted on vehicle 2001, for example, to the communication module 2013.

[0141] The drive unit 2002 consists of, for example, an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel, which is operated by the user.

[0142] The electronic control unit 2010 consists of a microprocessor 2031, memory (ROM, RAM) 2032, and communication ports (IO ports) 2033. Signals from various sensors 2021 to 2029 installed in the vehicle 2001 are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0143] Signals from various sensors 2021-2029 include current signals from current sensor 2021 which senses motor current, front and rear wheel rotation speed signals obtained by rotation speed sensor 2022, front and rear wheel air pressure signals obtained by air pressure sensor 2023, vehicle speed signals obtained by vehicle speed sensor 2024, acceleration signals obtained by acceleration sensor 2025, accelerator pedal depression signals obtained by accelerator pedal sensor 2029, brake pedal depression signals obtained by brake pedal sensor 2026, shift lever operation signals obtained by shift lever sensor 2027, and detection signals obtained by object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0144] The Information Services Unit 2012 consists of various devices for providing various types of information, such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, television, and radio, and one or more ECUs that control these devices. The Information Services Unit 2012 uses information acquired from external devices via a communication module 2013, etc., to provide various multimedia information and multimedia services to the occupants of the vehicle 2001.

[0145] The driver assistance system unit 2030 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 2030 also sends and receives various information via the communication module 2013 to realize driver assistance functions or autonomous driving functions.

[0146] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via its communication port. For example, the communication module 2013 sends and receives data via its communication port 2033 to the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, the microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021-29 provided in the vehicle 2001.

[0147] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station or a mobile station.

[0148] The communication module 2013 transmits current signals from current sensors input to the electronic control unit 2010 to an external device via wireless communication. The communication module 2013 also transmits, via wireless communication, other signals input to the electronic control unit 2010, including front and rear wheel rotation speed signals obtained by the rotation speed sensor 2022, front and rear wheel air pressure signals obtained by the air pressure sensor 2023, vehicle speed signals obtained by the vehicle speed sensor 2024, acceleration signals obtained by the acceleration sensor 2025, accelerator pedal depression signals obtained by the accelerator pedal sensor 2029, brake pedal depression signals obtained by the brake pedal sensor 2026, shift lever operation signals obtained by the shift lever sensor 2027, and detection signals obtained by the object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0149] The communication module 2013 receives various information (traffic information, signal information, distance information, etc.) transmitted from an external device and displays it on the information service unit 2012 installed in the vehicle 2001. The communication module 2013 also stores the various information received from the external device in memory 2032, which is available to the microprocessor 2031. Based on the information stored in memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021-2029, etc., installed in the vehicle 2001.

[0150] (Supplement to the embodiment) While embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, substitutions, etc. Specific numerical examples have been used to facilitate understanding of the invention, but unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention, and matters described in two or more items may be combined as needed, and matters described in one item may be applied to matters described in another item (as long as they do not contradict each other). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical parts. The operation of multiple functional units may be physically performed by one part, or the operation of one functional unit may be physically performed by multiple parts. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as it does not contradict each other. For the convenience of explaining the processing, the base station 10 and terminal 20 have been described using functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to an embodiment of the present invention and the software operated by the processor of the terminal 20 according to an embodiment of the present invention may be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0151] Furthermore, the notification of information is not limited to the embodiments / models described herein and may be carried out by other methods. For example, the notification of information may be carried out by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or combinations thereof. Also, RRC signaling may be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0152] Each aspect / embodiment described in this disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (where x is, for example, an integer or decimal)), FRA (Future Radio Access), NR (new Radio), New radio access (NX), Future generation radio access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), and IEEE This may apply to at least one system utilizing 802.20, UWB (Ultra-WideBand), Bluetooth®, or other appropriate systems, and to next-generation systems extended, modified, created, or defined based thereon. It may also apply to a combination of multiple systems (for example, a combination of at least one of LTE and LTE-A with 5G).

[0153] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described herein may be reordered, provided they are consistent with each other. For example, the methods described herein present various step elements in an exemplary order and are not limited to that specific order.

[0154] In this specification, specific operations performed by the base station 10 may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station 10, it is clear that various operations performed for communication with the terminal 20 can be performed by the base station 10 and at least one of the other network nodes (for example, an MME or S-GW, but not limited to these). Although the above example illustrates the case where there is one other network node besides the base station 10, the other network node may be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0155] The information or signals described in this disclosure may be output from a higher layer (or lower layer) to a lower layer (or higher layer). They may also be input and output via multiple network nodes.

[0156] Input and output information may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0157] The determination in this disclosure may be made by a value represented by one bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0158] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0159] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0160] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0161] In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and symbol may be a signal (signaling). Also, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, cell, frequency carrier, etc.

[0162] The terms “system” and “network” as used in this disclosure are interchangeable.

[0163] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a given value, or other corresponding information. For example, wireless resources may be indicated by an index.

[0164] The names used for the parameters described above are not restrictive in any way. Furthermore, the formulas and other expressions using these parameters may differ from those expressly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0165] In this disclosure, terms such as "base station (BS)", "wireless base station", "base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0166] A base station can accommodate one or more (e.g., three) cells. If a base station accommodates multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a Remote Radio Head (RRH)). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0167] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0168] A mobile station may also be referred to by those skilled in the art as a 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 several other appropriate terms.

[0169] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. 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 vehicle (e.g., a car, an airplane, etc.), an unmanned mobile body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0170] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals 20 (which may be called, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, the terminals 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc., may be interpreted as side channel.

[0171] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station may be configured to have the same functions as the user terminal described above.

[0172] As used in this disclosure, the terms “determining” and “determining” may encompass a wide variety of actions. “Determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in a table, database, or other data structure), and ascertaining. “Determining” may also include, for example, receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and accessing (e.g., accessing data in memory). Furthermore, "judgment" and "decision" can include considering something as having been "judged" or "decided" after resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" and "decision" can include considering something as having been "judged" or "decided" after some action. Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0173] The terms “connected,” “coupled,” or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be reinterpreted as “access.” As used in this disclosure, two elements may be considered to be “connected” or “coupled” with each other using at least one of one or more wires, cables, and printed electrical connections, and, in some non-limiting and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

[0174] The reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot depending on the applicable standard.

[0175] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0176] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, references to the first and second elements do not imply that only two elements may be employed, or that the first element must precede the second element in any way.

[0177] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0178] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0179] A wireless frame may consist of one or more frames in the time domain. Each of these frames in the time domain may be called a subframe. A subframe may further consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0180] Numerical logic may be communication parameters applied to at least one of the transmission and reception of a signal or channel. Numerical logic may include, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, and specific windowing processes performed by the transceiver in the time domain.

[0181] A slot may consist of one or more symbols in the time domain (such as OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). A slot may also be a time unit based on neurology.

[0182] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. Minislots may also be called subslots. Minislots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0183] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Different names may be used for each of these terms.

[0184] For example, one subframe may be called a Transmission Time Interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one mini-slot may be called a TTI. In other words, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0185] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each terminal 20 to allocate wireless resources (such as the frequency bandwidth and transmission power available to each terminal 20) in TTI units. However, the definition of TTI is not limited to this.

[0186] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0187] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0188] A TTI with a time length of 1ms may also be called a normal TTI, long TTI, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may also be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, mini slot, sub slot, slot, etc.

[0189] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0190] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0191] Furthermore, the time domain of RB may contain one or more symbols and may be the length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc., may each consist of one or more resource blocks.

[0192] One or more RBs may also be called a Physical RB (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0193] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0194] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a particular neurology system in a given carrier. These common RBs may be identified by an index of the RBs relative to a common reference point of the carrier. A Bandwidth Part (PRB) may be defined and numbered within a given BWP.

[0195] A BWP may include a BWP for UL (Ultraviolet Link) and a BWP for DL ​​(Download Link). One or more BWPs may be set for a terminal 20 within a single carrier.

[0196] At least one of the configured BWPs may be active, and terminal 20 does not need to be expected to send or receive a predetermined signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0197] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0198] In this disclosure, if articles are added through translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0199] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0200] Each aspect / embodiment described herein may be used individually, in combination, or switched between as needed during implementation. Furthermore, notification of specific information (e.g., notification that "X is") is not limited to explicit notification, but may also be implicit (e.g., by not providing such notification).

[0201] Although the present disclosure has been described in detail above, it will be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the intent and scope of the present disclosure as defined by the claims. Therefore, the descriptions in the present disclosure are illustrative and not intended to be restrictive in any way. [Explanation of symbols]

[0202] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 devices 210 Transmitter 220 Receiver 230 Setting section 240 Control Unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device 2001 Vehicle 2002 Drive Unit 2003 Steering Department 2004 Accelerator pedal 2005 Brake pedal 2006 Shift Lever 2007 Front Wheel 2008 Rear wheel 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 Rotation speed sensor 2023 Pneumatic Sensor 2024 Vehicle Speed ​​Sensor 2025 Accelerometer 2026 Brake Pedal Sensor 2027 Shift lever sensor 2028 Object Detection Sensor 2029 Accelerator pedal sensor 2030 Driver Support Systems Department 2031 Microprocessor 2032 memory (ROM, RAM) 2033 Communication port (I / O port)

Claims

1. A base station capable of communication in high-frequency bands including unlicensed bands, A transmitting unit that performs a first downlink transmission and a second downlink transmission to be transmitted after the first downlink transmission, It includes a control unit that controls channel access with a variable detection period, When the transmitting unit initiates channel occupancy through channel access, it performs the first downlink transmission and the second downlink transmission during a predetermined period of channel occupancy. A base station in which, when the transmitting unit performs the second downlink transmission during the predetermined period, the control unit does not perform the detection before performing the second downlink transmission.

2. The base station according to claim 1, wherein the predetermined period is 5 ms.

3. A base station capable of communication in high-frequency bands including unlicensed bands, A transmitting unit that performs a first downlink transmission and a second downlink transmission to be transmitted after the first downlink transmission, It includes a control unit that controls channel access with a variable detection period, When the transmitting unit initiates channel occupancy through channel access, it performs the first downlink transmission and the second downlink transmission during a predetermined period of channel occupancy. The control unit controls whether or not to perform the detection before the second downlink transmission, based on the interval between the end of the first downlink transmission and the start of the second downlink transmission, at the base station.

4. A terminal capable of communication in high-frequency bands, including unlicensed bands, A transmitting unit that performs a first uplink transmission and a second uplink transmission to be transmitted after the first uplink transmission, It includes a control unit that controls channel access with a variable detection period, When the transmitting unit initiates channel occupancy through channel access, it performs the first uplink transmission and the second uplink transmission during a predetermined period of channel occupancy. A terminal in which, when the transmitting unit performs the second uplink transmission within the predetermined period, the control unit does not perform the detection before performing the second uplink transmission.

5. A terminal capable of communication in high-frequency bands, including unlicensed bands, A transmitting unit that performs a first uplink transmission and a second uplink transmission to be transmitted after the first uplink transmission, It includes a control unit that controls channel access with a variable detection period, When the transmitting unit initiates channel occupancy through channel access, it performs the first uplink transmission and the second uplink transmission during a predetermined period of channel occupancy. The control unit controls whether or not to perform the detection before the second uplink transmission, based on the interval between the end of the first uplink transmission and the start of the second uplink transmission.

6. A communication method performed by a base station capable of communicating in high-frequency bands including unlicensed bands, A transmission step that includes performing a first downlink transmission and a second downlink transmission to be transmitted after the first downlink transmission, The system includes a control step for controlling channel access, where the detection period is variable. The transmission step, when channel occupancy is initiated by channel access, performs the first downlink transmission and the second downlink transmission during a predetermined period of channel occupancy. A communication method wherein, if the second downlink transmission is performed during the predetermined period, the control step does not perform the detection before the second downlink transmission.

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