Communication device and communication method

Abstract

This base station comprises: a receiving unit that performs listen before talk (LBT) for time division multiplexing a plurality of reception beams that correspond to a plurality of transmission beams that are applied to transmission in channel occupancy time (COT), and performing round-robin sensing applying each of the plurality of reception beams; and a transmission unit that applies, to the transmission in the COT, transmission beams corresponding to reception beams in which a busy state was not detected in the LBT among the plurality of reception beams.

Description

Base station and communication method

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

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

[0003] NR Release 17 is considering the use of a higher frequency band than in previous releases (e.g., Non-Patent Document 2). For example, in the frequency band from 52.6 GHz to 71 GHz, applicable numerology including subcarrier spacing, channel bandwidth, etc., physical layer design, and expected interference in actual wireless communications are being considered.

[0004] 3GPP TS 38.300 V16.6.0 (2021-06) 3GPP TS 38.306 V16.5.0 (2021-06)

[0005] In newly operating frequency bands that use higher frequencies than conventional ones, directional LBT (Directional Listen Before Talk), which applies beams to sensing, is being considered. When implementing directional LBT, it is necessary to determine how to apply beams to sensing.

[0006] The present invention has been made in view of the above points, and makes it possible to perform directional LBT (Directional Listen before talk) that applies multiple beams in a wireless communication system.

[0007] According to the disclosed technology, a base station is provided that has a receiving unit that performs LBT (Listen before talk) by time-division multiplexing multiple receiving beams corresponding to multiple transmitting beams applied to transmission in COT (Channel Occupancy Time) and performing sensing to apply each of the multiple receiving beams in a round-robin manner, and a transmitting unit that applies a transmitting beam corresponding to a receiving beam among the multiple receiving beams that has not been detected as being busy in the LBT to transmission in the COT.

[0008] According to the disclosed technology, it is possible to perform directional LBT (Directional Listen before talk) that applies multiple beams in a wireless communication system.

[0009] FIG. 1 is a diagram illustrating an example of a configuration of a wireless communication system according to an embodiment of the present invention. FIG. 2 is a diagram illustrating an example of a frequency range according to an embodiment of the present invention. FIG. 3 is a diagram illustrating an example of LBT. FIG. 4 is a diagram illustrating an example of a hidden terminal problem. FIG. 5 is a diagram illustrating an example (1) of a multi-beam COT. FIG. 6 is a diagram illustrating an example (2) of a multi-beam COT. FIG. 7 is a diagram illustrating an example of a round-robin CCA. FIG. 8 is a diagram illustrating an example (1) of a round-robin CCA when a single back-off counter is applied according to an embodiment of the present invention. FIG. 9 is a diagram illustrating an example (2) of a round-robin CCA when a single back-off counter is applied according to an embodiment of the present invention. FIG. 10 is a diagram illustrating an example (3) of a round-robin CCA when a single back-off counter is applied according to an embodiment of the present invention. FIG. 11 is a diagram illustrating an example (4) of a round-robin CCA when a single back-off counter is applied according to an embodiment of the present invention. FIG. 12 is a diagram illustrating an example (5) of a round-robin CCA when a single back-off counter is applied according to an embodiment of the present invention. FIG. 13 is a diagram illustrating an example (6) of a round-robin CCA when a single back-off counter is applied according to an embodiment of the present invention. FIG. 14 is a diagram illustrating an example (7) of a round-robin CCA when a single back-off counter is applied according to an embodiment of the present invention. FIG. 15 is a diagram illustrating an example (8) of a round-robin CCA when a single back-off counter is applied according to an embodiment of the present invention. FIG. 16 is a diagram illustrating an example (9) of a round-robin CCA when a single back-off counter is applied according to an embodiment of the present invention. FIG. 1 is a diagram showing an example (10) of round robin CCA when a single back-off counter is applied in an embodiment of the present invention. FIG. 2 is a diagram showing an example (11) of round robin CCA when a single back-off counter is applied in an embodiment of the present invention. FIG. 3 is a diagram showing an example (12) of round robin CCA when a single back-off counter is applied in an embodiment of the present invention. FIG. 4 is a diagram showing an example (13) of round robin CCA when a single back-off counter is applied in an embodiment of the present invention. FIG. 5 is a diagram showing an example (14) of round robin CCA when a single back-off counter is applied in an embodiment of the present invention. FIG. 6 is a diagram showing an example (1) of round robin CCA when an individual back-off counter is applied in an embodiment of the present invention. FIG. 7 is a diagram showing an example (2) of round robin CCA when an individual back-off counter is applied in an embodiment of the present invention.FIG. 1 is a diagram showing an example (3) of round robin CCA when an individual back-off counter is applied in an embodiment of the present invention. FIG. 2 is a diagram showing an example (4) of round robin CCA when an individual back-off counter is applied in an embodiment of the present invention. FIG. 3 is a diagram showing an example (5) of round robin CCA when an individual back-off counter is applied in an embodiment of the present invention. FIG. 4 is a diagram showing an example (6) of round robin CCA when an individual back-off counter is applied in an embodiment of the present invention. FIG. 5 is a diagram showing an example (7) of round robin CCA when an individual back-off counter is applied in an embodiment of the present invention. FIG. 6 is a diagram showing an example (8) of round robin CCA when an individual back-off counter is applied in an embodiment of the present invention. FIG. 7 is a diagram showing an example of a functional configuration of a base station 10 in an embodiment of the present invention. FIG. 8 is a diagram showing an example of a functional configuration of a terminal 20 in an embodiment of the present invention. FIG. 9 is a diagram showing an example of a hardware configuration of a base station 10 or a terminal 20 in an embodiment of the present invention. FIG. 10 is a diagram showing an example of a configuration of a vehicle 2001 in an embodiment of the present invention.

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

[0011] In the operation of the wireless communication system according to the embodiment of the present invention, existing technology is used as appropriate. However, the existing technology is, for example, the existing LTE, but is not limited to the existing LTE. Furthermore, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and systems subsequent to LTE-Advanced (e.g., NR), unless otherwise specified.

[0012] 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), and PUSCH (Physical Uplink Shared Channel) used in existing LTE are used. This is for convenience of description, and similar signals, functions, etc. may be called by other names. In addition, the above-mentioned terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, etc. However, even if a signal is used in NR, it is not necessarily stated as "NR-".

[0013] Furthermore, in the embodiment of the present invention, the duplex method may be a time division duplex (TDD) method, a frequency division duplex (FDD) method, or another method (for example, flexible duplex, etc.).

[0014] Furthermore, in the embodiments of the present invention, "configuring" radio parameters etc. may mean that predetermined values ​​are pre-configured, or that radio parameters notified from the base station 10 or the terminal 20 are set.

[0015] Fig. 1 is a diagram showing an example of the configuration of a wireless communication system according to an embodiment of the present invention. As shown in Fig. 1, the wireless communication system according to the embodiment of the present invention includes a base station 10 and a terminal 20. Although Fig. 1 shows one base station 10 and one terminal 20, this is an example, and there may be a plurality of each.

[0016] The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. The physical resources of a wireless signal are defined in the time domain and the frequency domain. The time domain may be defined by the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols, and the frequency domain may be defined by the number of subcarriers or the number of resource blocks. The base station 10 transmits a synchronization signal and system information to the terminal 20. The synchronization signal is, for example, NR-PSS and NR-SSS. The system information is, for example, transmitted via NR-PBCH and is also referred to as broadcast information. The synchronization signal and system information may also be referred to as SSB (SS / PBCH block). As shown in FIG. 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 by performing beamforming. Furthermore, both the base station 10 and the terminal 20 can apply MIMO (Multiple Input Multiple Output) communication to DL or UL. Furthermore, both the base station 10 and the terminal 20 may communicate via a secondary cell (SCell: Secondary Cell) and a primary cell (PCell: Primary Cell) using CA (Carrier Aggregation). Furthermore, the terminal 20 may communicate via a primary cell of the base station 10 and a primary secondary cell group cell (PSCell: Primary SCG Cell) of another base station 10 using DC (Dual Connectivity).

[0017] The terminal 20 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, or an M2M (Machine-to-Machine) communication module. As shown in Fig. 1, the 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. The terminal 20 also receives various reference signals transmitted from the base station 10 and measures propagation path quality based on the reception results of the reference signals.

[0018] FIG. 2 is a diagram illustrating an example of a frequency range according to an embodiment of the present invention. The NR specifications of 3GPP (registered trademark) Release 15 and Release 16 are considering the operation of frequency bands above 52.6 GHz. As shown in FIG. 2, the currently specified frequency range (FR) 1 is a frequency band 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 is a frequency band from 24.25 GHz to 52.6 GHz, with a SCS of 60, 120, or 240 kHz and a bandwidth of 50 MHz to 400 MHz. For example, a newly operated frequency band may be considered to be from 52.6 GHz to 71 GHz. Furthermore, frequency bands above 71 GHz may also be considered for support.

[0019] In the new frequency bands operated in 3GPP Release 17, the channel access mechanism is assumed to be beam-based to comply with regulatory requirements applicable to unlicensed bands. For example, both LBT (Listen Before Talk) access and non-LBT access may be adopted, and in the case of non-LBT access, an additional sensing mechanism may not be adopted. Also, omni-directional LBT, directional LBT, and receiver-side assistance may be adopted. Also, enhancements to the power detection threshold may be implemented. Hereinafter, omni-directional LBT is also referred to as omni-LBT.

[0020] 3 is a diagram illustrating an example of LBT. For example, in the frequency band from 52.6 GHz to 71 GHz, the CCA (Clear Channel Assessment) procedure may define a channel detection period of 8 microseconds + 5 microseconds × random counter, as shown in FIG. 3. In FIG. 3, the random counter is set to 3 in the first LBT, and the channel detection period is 8 + 5 × 3 = 23 microseconds, and a channel busy state is detected in a detection period from 14 microseconds to 18 microseconds.

[0021] Also, in Figure 3, the second LBT starts with the random counter, which detected channel busy in the first LBT, at a state of 2, and the channel detection period is 8 + 5 x 2 = 18 microseconds, and since no channel busy is detected during that detection period, transmission is started.

[0022] Note that COT (Channel Occupancy Time) sharing may or may not be supported. Also, within 1 COT, LBT by other terminals that apply backoff and random counters may be executed, which may be the same as when the CCA procedure starts. Also, within 1 COT, LBT by other terminals that do not apply backoff and random counters may be executed, which may be the same as Type 2 LBT in NR-U. Also, within 1 COT, LBT by other terminals may not be executed.

[0023] Since beam-based transmission and reception is widely used in the NR52.6-71 GHz band, directional LBT, which applies beams to sensing, may be supported to improve the success rate of LBT. Hereinafter, directional LBT will also be referred to simply as LBT.

[0024] For example, LBT corresponding to COT applying multiple beams of MU-MIMO (Multi User MIMO) or SDM (Spatial Division Multiplexing) transmission may be supported. For example, COT applying multiple beams may be achieved by a single LBT using a wide sensing beam, or by LBT for each beam. Note that a sensing beam is a beam applied for sensing in LBT and may be referred to as an eCCA (enhanced CCA) beam. Furthermore, successful LBT or successful eCCA may mean that a busy state is not detected as a result of applying a certain beam to perform sensing, and failed LBT or failed eCCA may mean that a busy state is detected as a result of applying a certain beam to perform sensing.

[0025] Furthermore, in a COT that applies time-division multiplexed beams by beam switching, a single LBT that applies a wide beam covering all beams used in the COT may be performed with an appropriate power detection threshold, or LBT sensing may be performed independently for each beam used in the COT at the start of the COT, or LBT sensing may be performed independently for each beam used in the COT at the start of the COT with the addition of Category 2 LBT requirements. Note that Category 2 LBT may be LBT without random backoff.

[0026] Note that applying a beam in LBT may mean applying a receive beam or receive beamforming. LBT may be performed by applying a receive beam or receive beamforming corresponding to the transmit beam or transmit beamforming applied to transmission in COT. A transmit beam or transmit beamforming corresponding to the receive beam or receive beamforming that was successfully sensed in LBT may be applied in COT to perform transmission. Note that a beam being wider than other beams, covering other beams, or including other beams may be defined as the beam at least covering the direction in space of the other beams, or may be defined in another way.

[0027] Furthermore, when LBT sensing is performed for each beam during MU-MIMO transmission, the operation may be as shown in 1)-4) below.

[0028] 1) When LBT per beam is performed in time division multiplexing, after completing eCCA for a certain beam, eCCA for other beams is performed, and no transmission is performed between eCCAs. 2) When LBT per beam is performed in time division multiplexing, after completing eCCA for a certain beam, transmission applying to that beam is performed at COT. Then, eCCA for other beams is performed. 3) When LBT per beam is performed in time division multiplexing, eCCA for different beams may be performed simultaneously in a round-robin manner. 4) When LBT per beam for different beams is performed simultaneously in parallel, it may be assumed that the node has the ability to sense different beams simultaneously.

[0029] 4 is a diagram illustrating an example of the hidden terminal problem. The channel power detected at the transmitting node and the receiving node in directional LBT may differ. As shown in FIG. 4, when the gNB directs a directional LBT beam to UE1, UE1 also receives an interference beam from a wireless LAN node that cannot be detected by the gNB, so a hidden terminal problem occurs in UE1.

[0030] Considering the hidden terminal problem, for example, the receiving node may perform and report legacy received signal strength indicator (RSSI) measurements, or may report apperiodic channel state information (AP-CSI), or may perform eCCA or Category 2 LBT.

[0031] 5 is a diagram showing an example (1) of a multi-beam COT. As shown in FIG. 5, beam #0, beam #1, and beam #2 are multiplexed by SDM (Spatial Division Multiplexing), and PDCCH and / or PDSCH can be transmitted by applying each beam in the same COT.

[0032] 6 is a diagram showing an example (2) of a multi-beam COT. As shown in FIG. 6, beam #0, beam #1, and beam #2 are multiplexed by TDM (Time Division Multiplexing), and PDCCH and / or PDSCH can be transmitted by applying each beam in the same COT.

[0033] 7 is a diagram illustrating an example of round-robin CCA. As shown in FIG. 7, CCA may be performed in a round-robin manner on multiple beams. In the example of FIG. 7, CCA is performed in a round-robin manner on beams #0, #1, and #2, and beams that are successful in CCA can be applied to a single COT for transmission.

[0034] When performing CCA using multiple beams in the round-robin manner, it is necessary to determine whether to use a single common back-off counter for each beam or to use individual back-off counters for each beam. Also, before starting COT, it is necessary to determine the operation of the round-robin method when a busy state is detected in LBT.

[0035] The following describes the case where a single backoff counter is used for multiple beams.

[0036] The initial value of a single backoff counter may be determined in a single step. For example, the initial value N of a single backoff counter may be determined to be a random integer value between 0 and a maximum value N_max_eff. The maximum value N_max_eff may be determined as follows: 1)-3)

[0037] 1) When the contention window length parameter CWp is applied to each beam individually, N_max_eff may be determined by a contention window size (CWS) parameter for multiple beams. For example, the maximum, minimum, or average value of the CWp values ​​of each beam may be set to N_max_eff. For example, N_max_eff = max{CWp(1), CWp(2), CWp(3), ...} may be used.

[0038] 2) When a common CWp value is set regardless of the beam, N_max_eff may be determined by the common CWp value.

[0039] 3) N_max_eff may be defined by the specification or determined by RRC configuration.

[0040] Alternatively, the initial value of a single backoff counter may be determined in two steps. The initial value N may be determined based on the values ​​of multiple counters generated independently for each beam. For example, in a first step, the initial values ​​of multiple counters generated independently for each beam may be determined for each beam. N1 may be selected from [0, CWp(1)], N2 may be selected from [0, CWp(2)], and N3 may be selected from [0, CWp(3)]. Next, in a second step, the maximum, minimum, or average value of the initial values ​​of the counters for each beam may be set as N_max_eff. For example, N_max_eff = max(N1, N2, N3, ...).

[0041] When performing sensing in a round-robin fashion, a backoff counter may be decremented after each round of sensing. The backoff counter value indicates the number of rounds required, and each round may consist of a 5 microsecond window for each beam.

[0042] Also, when sensing is performed in a round-robin manner, the backoff counter may be decremented for each sensing beam. The backoff counter value may represent the total number of idle 5 microsecond windows for all beams.

[0043] When sensing is performed in a round-robin manner, the backoff counter may start after an 8-microsecond window for all beams. Also, when sensing is performed in a round-robin manner, the backoff counter may start after an 8-microsecond window for the first beam. Also, when sensing is performed in a round-robin manner, an 8-microsecond window for each beam may be sensed before a 5-microsecond window for each beam in the first round. Also, when sensing is performed in a round-robin manner, 8-microsecond windows for beams other than the first beam may not be sensed.

[0044] 8 is a diagram showing an example (1) of round-robin CCA when a single backoff counter is applied in an embodiment of the present invention. As shown in FIG. 8, when sensing is performed in a round-robin manner, the backoff counter may be decremented for each sensing round. Also, as shown in FIG. 8, when sensing is performed in a round-robin manner, the backoff counter may be started after an 8-microsecond window for all beams.

[0045] 9 is a diagram showing an example (2) of round-robin CCA when a single backoff counter is applied in an embodiment of the present invention. As shown in FIG. 9, when sensing is performed in a round-robin manner, the backoff counter may be decremented for each sensing round. Also, as shown in FIG. 9, when sensing is performed in a round-robin manner, the backoff counter may start after an 8-microsecond window for the first beam, and an 8-microsecond window for each beam may be sensed before the 5-microsecond window for the first round.

[0046] 10 is a diagram showing an example (3) of round-robin CCA when a single backoff counter is applied in an embodiment of the present invention. As shown in FIG. 10, when sensing is performed in a round-robin manner, the backoff counter may be decremented for each sensing round. Also, as shown in FIG. 10, when sensing is performed in a round-robin manner, the backoff counter may be started after an 8-microsecond window of the first beam, and 8-microsecond windows other than the first beam may not be sensed.

[0047] 11 is a diagram showing an example (4) of round-robin CCA when a single backoff counter is applied in an embodiment of the present invention. As shown in FIG. 11, when sensing is performed in a round-robin manner, the backoff counter may be decremented for each sensing beam. Also, as shown in FIG. 11, when sensing is performed in a round-robin manner, the backoff counter may be started after an 8-microsecond window for all beams.

[0048] 12 is a diagram showing an example (5) of round-robin CCA when a single backoff counter is applied in an embodiment of the present invention. As shown in FIG. 12, when sensing is performed in a round-robin manner, the backoff counter may be decremented for each sensing beam. Also, as shown in FIG. 12, when sensing is performed in a round-robin manner, the backoff counter may start after an 8-microsecond window for the first beam, and an 8-microsecond window for each beam may be sensed before the 5-microsecond window for the first round.

[0049] 13 is a diagram showing an example (6) of round-robin CCA when a single backoff counter is applied in an embodiment of the present invention. As shown in FIG. 13, when sensing is performed in a round-robin manner, the backoff counter may be decremented for each sensing beam. Also, as shown in FIG. 13, when sensing is performed in a round-robin manner, the backoff counter may start after an 8-microsecond window for the first beam, and 8-microsecond windows for beams other than the first beam may not be sensed.

[0050] If busy is detected in any beam, the operation may be as shown in 1)-5) below.

[0051] 1) A switch may be made to omni LBT or LBT using a wider sensing beam. The initial value of the backoff counter in omni LBT or LBT using a wider sensing beam may be reset to a new value, or may be set based on the value of the backoff counter when a busy state is detected in round-robin sensing.

[0052] 2) The LBT may be terminated as a failure.

[0053] 3) The backoff counter value may be frozen and sensing of the beam on which busy is detected may continue. For example, sensing may continue until the beam on which busy is detected becomes idle, and after the beam becomes idle, sensing of the next beam may proceed. Alternatively, round-robin sensing may continue until busy is detected X times on the beam. A beam on which busy is detected X times may not be used as a busy beam in COT.

[0054] 4) Sensing of the beam where busy is detected may be terminated, and sensing may be performed in a round-robin manner on the remaining beams. The beam where busy is detected may not be used as a busy beam in COT.

[0055] 5) The backoff counter value may be frozen and round-robin sensing may continue until all beams are idle. For example, an idle state may be detected by sensing in a 5 microsecond window, or an idle state may be detected by sensing in an 8 microsecond window and a 5 microsecond window.

[0056] In addition, additional sensing may be performed before starting COT. For example, one-shot LBT may be performed again for each beam that has been successfully sensed before starting COT. For example, one-shot omni LBT or LBT using a wider beam that includes at least each beam that has been successfully sensed may be performed before starting COT.

[0057] 14 is a diagram showing an example (7) of round-robin CCA when a single backoff counter is applied in an embodiment of the present invention. When sensing is performed in a round-robin manner, the backoff counter is decremented for each sensing round and starts after an 8-microsecond window for all beams.

[0058] As shown in Figure 14, the backoff counter value may be frozen and sensing of the beam where busy is detected may continue. Alternatively, as shown in Figure 14, sensing may be continued until the beam where busy is detected becomes idle, and after the beam becomes idle, sensing of the next beam may proceed. In the example of Figure 14, LBT of all beams is successful, and beam #0, beam #1, and beam #2 are available for COT.

[0059] Fig. 15 shows an example (8) of round-robin CCA when a single backoff counter is applied in an embodiment of the present invention. Fig. 15 shows an example in which, when sensing is performed in a round-robin manner, the backoff counter is decremented for each sensing round and the backoff counter starts after an 8-microsecond window for all beams.

[0060] As shown in Figure 15, sensing of the beam where busy is detected may be terminated, and round-robin sensing may be performed on the remaining beams. The beam where busy is detected may not be used as a busy beam in COT. In the example of Figure 15, LBT of beams other than beam #2 is successful, and beams #0 and #1 are available for use in COT.

[0061] Fig. 16 shows an example (9) of round-robin CCA when a single backoff counter is applied in an embodiment of the present invention. Fig. 16 shows an example in which, when sensing is performed in a round-robin manner, the backoff counter is decremented every round and starts after an 8-microsecond window for all beams.

[0062] As shown in Figure 16, the backoff counter value may be frozen and sensing may continue in a round-robin manner with 5 microsecond windows until all beams are idle. In the example of Figure 16, LBT for all beams is successful, and beams #0, #1, and #2 are available for COT.

[0063] Fig. 17 shows an example (10) of round-robin CCA when a single backoff counter is applied in an embodiment of the present invention. Fig. 17 shows an example in which, when sensing is performed in a round-robin manner, the backoff counter is decremented every round and starts after an 8 microsecond window for all beams.

[0064] As shown in Figure 17, the backoff counter value may be frozen and sensing may continue in a round-robin manner with 5 microsecond windows until all beams are idle, and the idle state may be detected with 8 microsecond windows and 5 microsecond windows. In the example of Figure 17, LBT for all beams is successful, and beam #0, beam #1, and beam #2 are available for COT.

[0065] 18 is a diagram showing an example (11) of round-robin CCA when a single backoff counter is applied in an embodiment of the present invention. When sensing is performed in a round-robin manner, the backoff counter is decremented for each sensing beam and the backoff counter starts after an 8-microsecond window for all beams.

[0066] As shown in Figure 18, the backoff counter value may be frozen and sensing of the beam where busy is detected may continue. Also, as shown in Figure 18, sensing may continue until the beam where busy is detected becomes idle, and after the idle state, sensing of the next beam may proceed. The idle state may be detected in an 8 microsecond window and a 5 microsecond window. In the example of Figure 18, LBT of all beams is successful, and beam #0, beam #1, and beam #2 are available for COT.

[0067] 19 is a diagram showing an example (12) of round-robin CCA when a single backoff counter is applied in an embodiment of the present invention. When sensing is performed in a round-robin manner, the backoff counter is decremented for each sensing beam and the backoff counter starts after an 8-microsecond window for all beams.

[0068] As shown in Figure 19, sensing of the beam where busy is detected may be terminated, and round-robin sensing may be performed on the remaining beams. The beam where busy is detected may not be used as a busy beam in COT. In the example of Figure 19, LBT of beams other than beam #2 is successful, and beams #0 and #1 are available for use in COT.

[0069] Figure 20 shows an example (13) of round-robin CCA when a single backoff counter is applied in an embodiment of the present invention. Figure 20 shows an example in which, when sensing is performed in a round-robin manner, the backoff counter is decremented for each sensing beam and the backoff counter starts after an 8-microsecond window for all beams.

[0070] As shown in Figure 20, the backoff counter value may be frozen and sensing may continue in a round-robin manner with 5 microsecond windows until all beams are idle. In the example of Figure 20, LBT for all beams is successful, and beams #0, #1, and #2 are available for COT.

[0071] Figure 21 shows an example of round-robin CCA (14) when a single backoff counter is applied in an embodiment of the present invention. Figure 21 shows an example in which, when sensing is performed in a round-robin manner, the backoff counter is decremented for each sensing beam and the backoff counter starts after an 8-microsecond window for all beams.

[0072] As shown in Figure 21, the backoff counter value may be frozen and sensing may continue in a round-robin manner with 5 microsecond windows until all beams are idle, and the idle state may be detected with 8 microsecond windows and 5 microsecond windows. In the example of Figure 21, LBT for all beams is successful, and beam #0, beam #1, and beam #2 are available for COT.

[0073] The following describes the case where an individual backoff counter is used for each beam.

[0074] When performing CCA using multiple beams in a round-robin manner, if a separate backoff counter is used for each beam, the initial value of each backoff counter may be determined independently. For example, as the initial values ​​of multiple backoff counters generated independently for each beam, N1 may be selected from [0, CWp(1)], N2 may be selected from [0, CWp(2)], and N3 may be selected from [0, CWp(3)].

[0075] Alternatively, a common value may be used as the initial value of each backoff counter. The common initial value of each backoff counter may be determined in a single step. For example, the initial value N of the common backoff counter may be determined as a random integer value between 0 and a maximum value N_max_eff. The maximum value N_max_eff may be determined as follows: 1)-3)

[0076] 1) When the contention window length parameter CWp is applied to each beam individually, N_max_eff may be determined by the CWS parameters for multiple beams. For example, the maximum, minimum, or average value of the CWp values ​​of each beam may be set to N_max_eff. For example, N_max_eff = max{CWp(1), CWp(2), CWp(3), ...} may be used.

[0077] 2) When a common CWp value is set regardless of the beam, N_max_eff may be determined by the common CWp value.

[0078] 3) N_max_eff may be defined by the specification or determined by RRC configuration.

[0079] Alternatively, the common initial value of the backoff counters may be determined in two steps. The initial value N may be determined based on the values ​​of multiple counters generated independently for each beam. For example, in a first step, the initial values ​​of multiple counters generated independently for each beam may be determined for each beam. N1 may be selected from [0, CWp(1)], N2 may be selected from [0, CWp(2)], and N3 may be selected from [0, CWp(3)]. Next, in a second step, the maximum, minimum, or average value of the initial values ​​of the counters for each beam may be set to N_max_eff. For example, N_max_eff = max(N1, N2, N3, ...).

[0080] When performing CCA applying multiple beams in a round-robin manner, if a separate backoff counter is used for each beam, the backoff counter may be decremented when idle in the sensing window of the corresponding sensing beam and frozen when busy.

[0081] Furthermore, when performing CCA applying multiple beams in a round-robin manner, if an individual backoff counter is used for each beam, the backoff counter may start after an 8-microsecond window for all beams. Furthermore, when performing sensing in a round-robin manner, the backoff counter may start after an 8-microsecond window for the first beam. Furthermore, when performing sensing in a round-robin manner, an 8-microsecond window for each beam may be sensed before a 5-microsecond window for each beam in the first round. Furthermore, when performing sensing in a round-robin manner, 8-microsecond windows for beams other than the first beam may not be sensed.

[0082] 22 is a diagram showing an example (1) of round-robin CCA when individual back-off counters are applied in an embodiment of the present invention. Fig. 22 shows an example in which the initial value of the back-off counter for beam #0 is N, the initial value of the back-off counter for beam #1 is M, and the initial value of the back-off counter for beam #2 is P, and the back-off counters are started after an 8-microsecond window for all beams. As shown in Fig. 22, when performing CCA that applies multiple beams in a round-robin manner, if individual back-off counters are used for each beam, the back-off counters may be started after an 8-microsecond window for all beams.

[0083] 23 is a diagram showing an example (2) of round-robin CCA when individual back-off counters are applied in an embodiment of the present invention. In this example, the initial value of the back-off counter for beam #0 is N, the initial value of the back-off counter for beam #1 is M, and the initial value of the back-off counter for beam #2 is P, and the back-off counters are started after an 8-microsecond window for all beams. As shown in FIG. 23, when performing CCA employing multiple beams in a round-robin manner, if individual back-off counters are used for each beam, the back-off counters may be started after an 8-microsecond window for the first beam, and the 8-microsecond window for each beam may be sensed before the 5-microsecond window for each beam in the first round.

[0084] 24 is a diagram showing an example (3) of round-robin CCA when individual back-off counters are applied in an embodiment of the present invention. In this example, the initial value of the back-off counter for beam #0 is N, the initial value of the back-off counter for beam #1 is M, and the initial value of the back-off counter for beam #2 is P, and the back-off counters are started after the 8-microsecond window for all beams. As shown in FIG. 24, when performing CCA using multiple beams in a round-robin manner, if individual back-off counters are used for each beam, the 8-microsecond windows for beams other than the first beam do not need to be sensed.

[0085] If busy is detected in any beam, the operation may be as shown in 1)-5) below.

[0086] 1) A switch may be made to omni LBT or LBT using a wider sensing beam. The initial value of the backoff counter in omni LBT or LBT using a wider sensing beam may be reset to a new value, or may be set based on the value of the backoff counter when a busy state is detected in round-robin sensing.

[0087] 2) The LBT may be terminated as a failure.

[0088] 3) The backoff counter value may be frozen and sensing of the beam on which busy is detected may continue. For example, sensing may continue until the beam on which busy is detected becomes idle, and after the beam becomes idle, sensing of the next beam may proceed. Alternatively, round-robin sensing may continue until busy is detected X times on the beam. A beam on which busy is detected X times may not be used as a busy beam in COT.

[0089] 4) Sensing of the beam where busy is detected may be terminated, and sensing may be performed in a round-robin manner on the remaining beams. The beam where busy is detected may not be used as a busy beam in COT.

[0090] 5) The backoff counter value may be frozen and round-robin sensing may continue until all beams are idle. For example, an idle state may be detected by sensing in a 5 microsecond window, or an idle state may be detected by sensing in an 8 microsecond window and a 5 microsecond window.

[0091] 25 is a diagram showing an example (4) of round-robin CCA when individual backoff counters are applied in an embodiment of the present invention. In this example, the initial value of the backoff counter for beam #0 is N, the initial value of the backoff counter for beam #1 is M, and the initial value of the backoff counter for beam #2 is P, and the backoff counters start after an 8-microsecond window for all beams.

[0092] As shown in Figure 25, the backoff counter value may be frozen and sensing of the beam where busy is detected may continue. Alternatively, as shown in Figure 25, sensing may continue until the beam where busy is detected becomes idle, and after the idle state, sensing of the next beam may proceed. The idle state may be detected in an 8 microsecond window and a 5 microsecond window.

[0093] 26 is a diagram showing an example (5) of round-robin CCA when individual backoff counters are applied in an embodiment of the present invention. In this example, the initial value of the backoff counter for beam #0 is N, the initial value of the backoff counter for beam #1 is M, and the initial value of the backoff counter for beam #2 is P, and the backoff counters start after an 8-microsecond window for all beams.

[0094] As shown in Fig. 26, sensing of a beam in which busyness is detected may be terminated, and sensing of the remaining beams may be performed in a round-robin manner. A beam in which busyness is detected may not be used as a busy beam in COT.

[0095] 27 is a diagram showing an example (6) of round-robin CCA when individual backoff counters are applied in an embodiment of the present invention. In this example, the initial value of the backoff counter for beam #0 is N, the initial value of the backoff counter for beam #1 is M, and the initial value of the backoff counter for beam #2 is P, and the backoff counters start after an 8-microsecond window for all beams.

[0096] As shown in FIG. 27, the backoff counter value may be frozen and sensing may continue with 5 microsecond windows in a round-robin fashion until all beams are idle.

[0097] 28 is a diagram showing an example (7) of round-robin CCA when individual backoff counters are applied in an embodiment of the present invention. In this example, the initial value of the backoff counter for beam #0 is N, the initial value of the backoff counter for beam #1 is M, and the initial value of the backoff counter for beam #2 is P, and the backoff counters start after an 8-microsecond window for all beams.

[0098] As shown in FIG. 28, the backoff counter value may be frozen and sensing may continue in a round-robin manner with 5 microsecond windows until all beams are idle, and the idle state may be detected with 8 microsecond and 5 microsecond windows.

[0099] Figure 29 shows an example (8) of round-robin CCA when individual backoff counters are applied in an embodiment of the present invention. As shown in Figure 29, if the initial value of the backoff counter differs depending on the beam and / or if the busy period differs depending on the beam, it is expected that a large gap will occur in the completion of sensing on each beam. Therefore, the following operations 1) to 4) may be performed.

[0100] 1) Additional sensing may be performed before starting COT, for example, one-shot LBT may be performed again for each successfully sensed beam before starting COT.

[0101] 2) Before starting COT, a one-shot omni-LBT or an LBT using a wider beam that includes at least each beam that was successfully sensed may be performed.

[0102] 3) When each backoff counter is initialized independently, a limit may be set on the difference between the initial values ​​of each backoff counter. For example, the limit may be applied to the difference between the minimum and maximum initial values, or an initial value with a difference greater than the limit may be prohibited and changed to a range between the upper and lower limits.

[0103] 4) A timer may be introduced to limit the gap between the end of sensing for each beam. For example, this timer may be called a round-robin end gap timer. This timer may be started when sensing for a beam is first completed. When this timer expires, LBT for that beam may be interrupted even if there are beams still being sensed.

[0104] The above-described LBT-related operations may be performed by the base station 10 or the terminal 20. The above-described LBT-related operations may be applicable to a specific frequency band. For example, the above-described LBT-related operations may be applicable to FR2-2 of 52.6-71 GHz.

[0105] In addition, LBT, eCCA or sensing in embodiments of the present invention may involve random backoff, may involve one-time one-shot backoff, or may involve sensing in a certain sensing slot.

[0106] The order of beams in the round robin method according to the embodiment of the present invention may be determined as appropriate.

[0107] In addition, which of the operations in the above-mentioned embodiments is executable may be set by higher layer parameters, may be reported by the terminal 20 as UE capabilities, may be defined in specifications, or may be determined by a combination of the settings of higher layer parameters and UE capabilities.

[0108] In addition, a UE capability may be defined that indicates whether the terminal 20 supports LBT, which performs sensing for each beam using time division multiplexing in a round robin manner to obtain COT to which multiple beams are applied.

[0109] In addition, a UE capability may be defined that indicates whether the terminal 20 supports LBT in which a single backoff counter is applied, in which sensing for each beam is performed in a round-robin manner using time division multiplexing to obtain a COT in which multiple beams are applied.

[0110] In addition, a UE capability may be defined that indicates whether the terminal 20 supports LBT, which performs sensing for each beam using time division multiplexing in a round robin manner to obtain a COT to which multiple beams are applied, and in which an individual backoff counter is applied to each beam.

[0111] In addition, a UE capability may be defined indicating whether the terminal 20 supports LBT, which performs sensing for each beam using time division multiplexing to obtain COT to which multiple beams are applied, in a round robin manner that continues sensing of busy beams.

[0112] In addition, a UE capability may be defined that indicates whether the terminal 20 supports one-shot LBT for each beam after completing LBT, which performs sensing for each beam using time division multiplexing in a round-robin manner to obtain COT to which multiple beams are applied.

[0113] In addition, a UE capability may be defined that indicates whether the terminal 20 supports omni LBT after completing an LBT in which sensing for each beam is performed in a round-robin manner using time division multiplexing to obtain a COT to which multiple beams are applied. In addition, a UE capability may be defined that indicates whether the terminal 20 supports one-shot omni LBT after completing an LBT in which sensing for each beam is performed in a round-robin manner using time division multiplexing to obtain a COT to which multiple beams are applied.

[0114] The above-described embodiment enables the base station 10 or the terminal 20 to perform directional LBT, in which sensing for each beam by time division multiplexing is performed in an appropriate round robin manner.

[0115] That is, in a wireless communication system, directional LBT (Directional Listen before talk) can be performed by applying multiple beams.

[0116] (Device Configuration) Next, a functional configuration example of the base station 10 and the terminal 20 that execute the processes and operations described above will be described. The base station 10 and the terminal 20 include functions for implementing the above-described embodiments. However, the base station 10 and the terminal 20 may each include only a part of the functions of the embodiments.

[0117] <Base Station 10> Figure 30 is a diagram showing an example of the functional configuration of the base station 10 in an embodiment of the present invention. As shown in Figure 30, 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 30 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations related to the embodiment of the present invention.

[0118] The transmitter 110 has a function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. The transmitter 110 also transmits inter-network node messages to other network nodes. The receiver 120 has a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, information of higher layers from the received signals. The transmitter 110 also has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, etc. to the terminal 20. The receiver 120 also receives inter-network node messages from other network nodes.

[0119] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20. The content of the setting information is, for example, information related to the setting of the LBT.

[0120] As described in the embodiment, the control unit 140 controls the setting of the LBT. The control unit 140 also executes scheduling. The function unit related to signal transmission in the control unit 140 may be included in the transmitting unit 110, and the function unit related to signal reception in the control unit 140 may be included in the receiving unit 120.

[0121] <Terminal 20> Figure 31 is a diagram showing an example of the functional configuration of terminal 20 in an embodiment of the present invention. As shown in Figure 31, 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 31 is merely an example. The names of the functional divisions and functional units may be any as long as they can execute the operations related to the embodiment of the present invention.

[0122] The transmitter 210 creates a transmission signal from transmission data and transmits the transmission signal wirelessly. The receiver 220 wirelessly receives various signals and acquires higher layer signals from the received physical layer signals. The receiver 220 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals, and the like transmitted from the base station 10. For example, the transmitter 210 transmits a PSCCH (Physical Sidelink Control Channel), a PSSCH (Physical Sidelink Shared Channel), a PSDCH (Physical Sidelink Discovery Channel), a PSBCH (Physical Sidelink Broadcast Channel), and the like to another terminal 20 as D2D communication, and the receiver 220 receives the PSCCH, PSSCH, PSDCH, or PSBCH, and the like, from the other terminal 20.

[0123] The setting unit 230 stores various setting information received from the base station 10 by the receiving unit 220. The setting unit 230 also stores setting information that is set in advance. The content of the setting information is, for example, information related to the setting of LBT.

[0124] As described in the embodiment, the control unit 240 controls the setting of the LBT. The function unit related to signal transmission in the control unit 240 may be included in the transmitting unit 210, and the function unit related to signal reception in the control unit 240 may be included in the receiving unit 220.

[0125] (Hardware Configuration) The block diagrams (FIGS. 30 and 31) used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may be realized by combining software with the single device or the multiple devices.

[0126] Functions include, but are not limited to, judgment, determination, assessment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. As mentioned above, there are no particular limitations on how these functions are implemented.

[0127] For example, the base station 10, the terminal 20, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 32 is a diagram illustrating an example of the hardware configuration of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The base station 10 and the terminal 20 described above 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.

[0128] In the following description, the term "apparatus" can be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0129] Each function in the base station 10 and the terminal 20 is realized by loading specified software (programs) onto hardware such as the processor 1001, the memory device 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing data in the memory device 1002 and the auxiliary memory device 1003.

[0130] The processor 1001 controls the entire computer by running, for example, an operating system. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, the above-mentioned control unit 140, control unit 240, etc. may be realized by the processor 1001.

[0131] Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002 and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 140 of the base station 10 shown in FIG. 30 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. Furthermore, for example, the control unit 240 of the terminal 20 shown in FIG. 31 may be implemented by a control program stored in the storage device 1002 and running on the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may also be transmitted from a network via a telecommunications line.

[0132] The storage device 1002 is a computer-readable recording medium and may be configured, for example, by at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), etc. The storage device 1002 may also be called a register, a cache, a main memory, etc. The storage device 1002 can store executable programs (program codes), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

[0133] The secondary storage device 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact 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 above-mentioned storage medium may be, for example, a database, a server, or other appropriate medium including at least one of the storage device 1002 and the secondary storage device 1003.

[0134] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, a transmission / reception antenna, an amplifier unit, a transmission / reception unit, a transmission path interface, etc. may be realized by the communication device 1004. The transmission / reception unit may be implemented as a transmission unit and a reception unit that are physically or logically separated.

[0135] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that outputs to the outside. Note that the input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0136] 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 may be configured using different buses between each device.

[0137] Furthermore, the base station 10 and the terminal 20 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), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0138] Fig. 33 shows a configuration example of a vehicle 2001. As shown in Fig. 33, the 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 to 2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in the present disclosure may be applied to a communication device mounted on the vehicle 2001, and may be applied to the communication module 2013, for example.

[0139] The drive unit 2002 is configured, for example, by 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 operated by the user.

[0140] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals are input to the electronic control unit 2010 from various sensors 2021 to 2029 provided in the vehicle 2001. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0141] The signals from the various sensors 2021 to 2029 include a current signal from a current sensor 2021 that senses the current of the motor, a rotation speed signal of the front and rear wheels obtained by a rotation speed sensor 2022, an air pressure signal of the front and rear wheels obtained by an air pressure sensor 2023, a vehicle speed signal obtained by a vehicle speed sensor 2024, an acceleration signal obtained by an acceleration sensor 2025, an accelerator pedal depression amount signal obtained by an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by a brake pedal sensor 2026, a shift lever operation signal obtained by a shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 2028.

[0142] The information service unit 2012 is composed of various devices, such as a car navigation system, an audio system, speakers, a television, and a radio, for providing various types of information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 provides various types of multimedia information and multimedia services to the occupants of the vehicle 2001 by using information acquired from external devices via the communication module 2013, etc.

[0143] The driving assistance system unit 2030 is composed of various devices that provide functions for preventing accidents and reducing the driving burden on the driver, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS, etc.), 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. In addition, the driving assistance system unit 2030 transmits and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0144] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via the communication port. For example, the communication module 2013 transmits and receives data via the communication port 2033 to and from the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021 to 29, which are provided in the vehicle 2001.

[0145] 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 an external device. For example, it transmits and receives various information to and from the external device 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, a mobile station, or the like.

[0146] The communication module 2013 transmits, via wireless communication to an external device, a current signal from the current sensor that is input to the electronic control unit 2010. The communication module 2013 also transmits, via wireless communication to an external device, the rotation speed signals of the front and rear wheels acquired by a rotation speed sensor 2022, the air pressure signals of the front and rear wheels acquired by an air pressure sensor 2023, the vehicle speed signal acquired by a vehicle speed sensor 2024, the acceleration signal acquired by an acceleration sensor 2025, the accelerator pedal depression amount signal acquired by an accelerator pedal sensor 2029, the brake pedal depression amount signal acquired by a brake pedal sensor 2026, the shift lever operation signal acquired by a shift lever sensor 2027, and detection signals for detecting obstacles, vehicles, pedestrians, etc. acquired by an object detection sensor 2028, all of which are input to the electronic control unit 2010.

[0147] The communication module 2013 receives various information (traffic information, traffic signal information, vehicle distance information, etc.) transmitted from external devices and displays it on the information service unit 2012 provided in the vehicle 2001. The communication module 2013 also stores the various information received from the external devices in a memory 2032 that can be used by the microprocessor 2031. Based on the information stored in the 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 to 2029, etc. provided in the vehicle 2001.

[0148] (Summary of the embodiment) As described above, according to the embodiment of the present invention, a base station is provided which has a receiving unit that performs LBT (Listen before talk) by time-division multiplexing multiple receiving beams corresponding to multiple transmitting beams applied to transmission in COT (Channel Occupancy Time) and performing sensing to apply each of the multiple receiving beams in a round-robin manner, and a transmitting unit that applies a transmitting beam corresponding to a receiving beam among the multiple receiving beams for which a busy state was not detected in the LBT to transmission in the COT.

[0149] The above configuration enables the base station 10 or the terminal 20 to perform directional LBT, which performs sensing for each beam by time division multiplexing in an appropriate round robin manner. That is, in a wireless communication system, directional LBT (Directional Listen before talk) can be performed, which applies multiple beams.

[0150] The receiver may apply a single backoff counter to the multiple receive beams and decrement the single backoff counter for each round or each beam. This configuration enables the base station 10 or the terminal 20 to perform directional LBT by performing sensing for each beam using time division multiplexing in an appropriate round-robin manner.

[0151] When the receiver detects that a certain receiving beam among the plurality of receiving beams is busy, the receiver may freeze the single backoff counter and continue sensing until the busy receiving beam becomes idle. With this configuration, the base station 10 or the terminal 20 can perform directional LBT, in which sensing for each beam by time division multiplexing is performed in an appropriate round robin manner.

[0152] When the receiver detects that a certain receiving beam among the plurality of receiving beams is busy, the receiver may terminate sensing of the busy receiving beam and sense the plurality of receiving beams other than the busy receiving beam in a round-robin manner. With this configuration, the base station 10 or the terminal 20 can perform directional LBT, in which sensing for each beam by time division multiplexing is performed in an appropriate round-robin manner.

[0153] The receiver may apply a back-off counter for each beam to each of the plurality of receiving beams and decrement the back-off counter for each round or each beam. This configuration enables the base station 10 or the terminal 20 to perform directional LBT by performing sensing for each beam by time division multiplexing in an appropriate round-robin manner.

[0154] In addition, according to an embodiment of the present invention, a communication method is provided in which a base station executes a receiving procedure that performs LBT (Listen before talk) in which multiple receiving beams corresponding to multiple transmitting beams applied to transmission in COT (Channel Occupancy Time) are time-division multiplexed and sensing that applies each of the multiple receiving beams is performed in a round-robin manner, and a transmitting procedure that applies a transmitting beam corresponding to a receiving beam among the multiple receiving beams that was not detected to be in a busy state in the LBT to transmission in the COT.

[0155] The above configuration enables the base station 10 or the terminal 20 to perform directional LBT, which performs sensing for each beam by time division multiplexing in an appropriate round robin manner. That is, in a wireless communication system, directional LBT (Directional Listen before talk) can be performed, which applies multiple beams.

[0156] (Supplementary Notes on the Embodiments) Although the 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, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, 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; matters described in two or more items may be used in combination as needed, and matters described in one item may apply to matters described in another item (as long as there is no contradiction). Boundaries between functional units or processing units in functional block diagrams do not necessarily correspond to boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the base station 10 and terminal 20 have been described using functional block diagrams, but such devices may be realized by hardware, software, or a combination thereof. The software operated by the processor of the base station 10 in accordance with an embodiment of the present invention and the software operated by the processor of the terminal 20 in accordance with an embodiment of the present invention may each be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0157] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0158] Each aspect / embodiment described in the present disclosure may be implemented using any of the following standards: LTE (Long Term Evolution), LTE-Advanced (LTE-A), 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 (x is, for example, an integer or a decimal number)), 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)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (Wi-Fi (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (Wi-Fi (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802.34 ( The present invention may be applied to at least one of systems using 802.20, UWB (Ultra-Wide Band), Bluetooth (registered trademark), or other suitable systems, and next-generation systems that are extended, modified, created, or defined based on these systems. The present invention may also be applied to a combination of multiple systems (e.g., a combination of LTE and / or LTE-A with 5G).

[0159] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be rearranged unless it is consistent. For example, the methods described in this disclosure present elements of various steps using an example order and are not limited to the particular order presented.

[0160] In this specification, a specific operation described as being performed by the base station 10 may be performed by its upper node in some cases. In a network consisting of one or more network nodes having the base station 10, it is clear that various operations performed for communication with the terminal 20 may be performed by at least one of the base station 10 and another network node other than the base station 10 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 10, the other network node may be a combination of multiple other network nodes (such as an MME and an S-GW).

[0161] The information, signals, etc. described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), or may be input / output via multiple network nodes.

[0162] Input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information may be overwritten, updated, or added to. Output information may be deleted. Input information may be transmitted to another device.

[0163] In the present disclosure, the determination may be made by a value represented by one bit (0 or 1), by a Boolean value (true or false), or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0164] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0165] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0166] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0167] Note that terms described 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 a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0168] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0169] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by an index.

[0170] The names used for the above-described parameters are not intended to be limiting in any way. Furthermore, the mathematical expressions using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0171] In the present disclosure, terms such as "base station (BS)," "radio base station," "base station device," "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. A base station may also be referred to by terms such as a macrocell, a small cell, a femtocell, and a picocell.

[0172] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can 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 the entire coverage area of ​​a base station and / or base station subsystem that provides communication services within that coverage area.

[0173] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," and the like may be used interchangeably.

[0174] 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 some other suitable terminology.

[0175] At least one of the base station and the mobile station may be referred to as 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 also include devices that do not necessarily move during communication operations. 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.

[0176] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present 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, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, terms such as an uplink channel and a downlink channel may be read as a side channel.

[0177] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station may be configured to have the functions of the user terminal described above.

[0178] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), and the like. Furthermore, "judgment" and "decision" can include regarding resolving, selecting, choosing, establishing, comparing, etc. as having been "judged" or "decided." In other words, "judgment" and "decision" can include regarding some action as having been "judged" or "decided." Furthermore, "judgment (decision)" can be interpreted as "assuming," "expecting," "considering," etc.

[0179] The terms "connected," "coupled," or any variation thereof, refer to 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" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using one or more wires, cables, and / or printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0180] The reference signal may be abbreviated as RS (Reference Signal) or may be called a pilot depending on the applicable standard.

[0181] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0182] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0183] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0184] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, when the term "or" is used in this disclosure, it is not intended to be an exclusive or.

[0185] A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed 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.

[0186] Numerology may be communication parameters that apply to the transmission and / or reception of a signal or channel, such as subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering operations performed by the transceiver in the frequency domain, specific windowing operations performed by the transceiver in the time domain, etc.

[0187] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol or a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol) in the time domain. A slot may be a time unit based on numerology.

[0188] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot 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.

[0189] The radio frame, subframe, slot, minislot, and symbol all represent time units for transmitting signals, and may be referred to by other names corresponding to the radio frame, subframe, slot, minislot, and symbol.

[0190] 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 minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc. instead of a subframe.

[0191] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate wireless resources (such as frequency bandwidth and transmission power that can be used by each terminal 20) to each terminal 20 in TTI units. Note that the definition of TTI is not limited to this.

[0192] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0193] When one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit for scheduling. Also, the number of slots (minislots) constituting the minimum time unit for scheduling may be controlled.

[0194] A TTI having a time length of 1 ms may be called a regular TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0195] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and greater than or equal to 1 ms.

[0196] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0197] The time domain of an RB may include one or more symbols and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0198] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0199] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0200] A Bandwidth Part (BWP) (which may also be referred to as a fractional bandwidth) may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a Common Reference Point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0201] 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.

[0202] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0203] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples, and various changes may be made to the number of subframes included in a radio frame, the number of slots per subframe or radio 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, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc.

[0204] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0205] In the present 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 "coupled" may also be interpreted in the same way as "different."

[0206] The aspects / embodiments described in this disclosure may be used alone, in combination, or switched depending on the implementation. Notification of predetermined information (e.g., notification that "X is true") is not limited to explicit notification, but may be implicit (e.g., not notifying the predetermined information).

[0207] Although the present disclosure has been described in detail above, it is 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 spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure.

[0208] This international patent application claims priority based on Japanese Patent Application No. 2021-132480, filed on August 16, 2021, the entire contents of which are incorporated herein by reference.

[0209] 10 Base station 110 Transmitter 120 Receiver 130 Setting unit 140 Control unit 20 Terminal 210 Transmitter 220 Receiver 230 Setting unit 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 unit 2004 Accelerator pedal 2005 Brake pedal 2006 Shift lever 2007 Front wheels 2008 Rear wheels 2009 Axle 2010 Electronic control unit 2012 Information service unit 2013 Communication module 2021 Current sensor 2022 Rotation speed sensor 2023 Tire pressure sensor 2024 Vehicle speed sensor 2025 Acceleration sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object detection sensor 2029 Accelerator pedal sensor 2030 Driving assistance system unit 2031 Microprocessor 2032 Memory (ROM, RAM) 2033 Communication port (IO port)

Claims

1. A control unit that performs sensing for each of one or more sensing beams; a transmitting unit that performs transmission using a transmission beam corresponding to a sensing beam for which busy is not detected in the sensing among the one or more sensing beams, A communication device, wherein the control unit independently initializes a counter corresponding to each of the one or more sensing beams.

2. The communication device described in Claim 1, wherein the control unit initializes the counter to a value selected from a predetermined range defined by a contention window.

3. The control unit decrements the counter when the sensing beam on which the sensing is performed is idle, The communication device according to claim 1 , wherein the control unit freezes the counter when the sensing beam in which the sensing is performed is busy.

4. A communication device as described in claim 1, wherein the transmitting unit performs the transmission after the value of the counter becomes zero.

5. A communication device as described in claim 1, wherein the sensing is performed in frequency range 2-2.

6. A communication method executed in a terminal or a base station in a wireless communication system, comprising: performing sensing on each of the one or more sensing beams; transmitting using a transmission beam corresponding to a sensing beam for which no busy state has been detected in the sensing among the one or more sensing beams; A communication method, wherein a counter corresponding to each of the one or more sensing beams is independently initialized.