Terminal and communication method

Abstract

The terminal has: a control unit that performs LBT (Listen Before Talk) in a band above a predetermined frequency; and a transmission unit that transmits a signal based on the result of the LBT, wherein the control unit performs LBT by detecting a preamble.

Description

Technical Field

[0001] The present invention relates to a terminal and a communication method in a wireless communication system. Background Art

[0002] In the successor system of LTE (Long Term Evolution), namely NR (New Radio) (also known as "5G"), technologies that meet requirements such as a large-capacity system, high-speed data transmission speed, low latency, simultaneous connection of multiple terminals, low cost, and power saving have been studied (for example, Non-Patent Document 1). 5G is a mobile communication system that supports high-frequency bands such as millimeter waves exceeding 10 GHz. It is possible to achieve ultra-high-speed wireless data communication at the Gbps level by using a frequency band width of several 100 MHz, which is extremely wide compared to existing systems such as LTE.

[0003] On the other hand, regarding the technology of millimeter waves in mobile communication, there is still room for development in the future. As a system after 5G, research on Beyond 5G and 6G has started (for example, Non-Patent Document 2). As candidates for research topics for Beyond 5G and 6G, the expansion of new frequency bands is being studied. For example, new frequency bands are bands above 100 GHz and terahertz bands, etc.

[0004] Prior Art Documents

[0005] Non-Patent Documents

[0006] Non-Patent Document 1: 3GPP TS 38.300 V16.0.0 (2019-12)

[0007] Non-Patent Document 2: NTT Docomo, Inc., White Paper "Advancement of 5G and 6G" (2020-01)

[0008] Non-Patent Document 3: 3GPP TR 38.807 V16.0.0 (2019-12)

[0009] Non-Patent Document 4: 3GPP TS 37.213 V16.0.0 (2019-12) Summary of the Invention

[0010] Problems to be Solved by the Invention

[0011] In the conventional LBT (Listen Before Talk) in NR, the bandwidth considering coexistence with a wireless LAN (Local Area Network) is targeted. On the other hand, in LBT in the high frequency band, coexistence with a wireless system having a much larger bandwidth than before needs to be considered. However, when performing LBT suitable for coexistence with other RATs, it is sometimes not suitable for coexistence with other systems of the same RAT, and the accuracy of LBT deteriorates.

[0012] The present invention has been made in view of the above circumstances, and an object thereof is to improve the accuracy of LBT (Listen Before Talk) in a wireless communication system.

[0013] Means for Solving the Problem

[0014] According to the disclosed technology, a terminal is provided, which has: a control unit that performs LBT (Listen Before Talk) in a band above a predetermined frequency; and a transmission unit that transmits a signal according to the result of the LBT, and the control unit performs LBT by detecting a preamble.

[0015] Effect of the Invention

[0016] According to the disclosed technology, in a wireless communication system, the accuracy of LBT (Listen Before Talk) can be improved. Description of the Drawings

[0017] Figure 1 It is a diagram showing a structural example (1) of a wireless communication system in an embodiment of the present invention.

[0018] Figure 2 It is a diagram showing a structural example (2) of a wireless communication system in an embodiment of the present invention.

[0019] Figure 3 It is a diagram showing an example of a frequency band in an embodiment of the present invention.

[0020] Figure 4 It is a flowchart showing an example of transmission based on LBT in an embodiment of the present invention.

[0021] Figure 5 It is a diagram showing an example of an LBT bandwidth in an embodiment of the present invention.

[0022] Figure 6 It is a diagram showing an example of the functional structure of a base station 10 in an embodiment of the present invention.

[0023] Figure 7This is a diagram showing an example of the functional structure of the terminal 20 in an embodiment of the present invention.

[0024] Figure 8 This is a diagram showing an example of the hardware structure of the base station 10 or the terminal 20 in an embodiment of the present invention. Detailed implementation manners

[0025] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the embodiments described below are merely examples, and the embodiments applying the present invention are not limited to the following embodiments.

[0026] When the wireless communication system according to the embodiment of the present invention operates, existing technologies can be appropriately used. However, this existing technology is, for example, existing LTE, but is not limited to existing LTE. In addition, unless otherwise specified, the term "LTE" used in this specification has a broad meaning including LTE-Advanced and subsequent modes (such as NR) of LTE-Advanced.

[0027] 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 ease of explanation, and signals, functions, etc. similar to them can also be called other names. In addition, the above terms in NR correspond to NR-SS, NR-PSS, NR-SSS, NR-PBCH, NR-PRACH, NR-PDCCH, NR-PDSCH, NR-PUCCH, NR-PUSCH, etc. However, even for signals used in NR, they are not necessarily explicitly marked as "NR-".

[0028] In addition, in an embodiment of the present invention, the duplex mode may be a TDD (Time Division Duplex) mode, an FDD (Frequency Division Duplex) mode, or may also be a mode other than these (for example, Flexible Duplex, etc.).

[0029] In addition, in an embodiment of the present invention, "configuring" or "specifying" wireless parameters, etc. may be pre-configuring a predetermined value, or may be configuring wireless parameters notified from the base station 10 or the terminal 20.

[0030] Figure 1 It is a diagram of a structural example (1) of a wireless communication system in an embodiment of the present invention. As Figure 1 shown, it includes a base station 10 and a terminal 20. Figure 1 One base station 10 and one terminal 20 are shown respectively, but this is only an example, and there may be multiple of each. In addition, the terminal 20 may be referred to as a "user device". In addition, the wireless communication system in this embodiment may also be referred to as an NR-U system.

[0031] 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 the wireless signal are defined by the time domain and the frequency domain. The time domain can be defined by time slots or OFDM symbols, and the frequency domain can be defined by sub-bands, sub-carriers, or resource blocks.

[0032] As Figure 1 shown, the base station 10 sends control information or data to the terminal 20 through the DL (Downlink), and receives control information or data from the terminal 20 through the UL (Uplink). Both the base station 10 and the terminal 20 can perform beamforming for signal transmission and reception. In addition, both the base station 10 and the terminal 20 can apply communication based on MIMO (Multiple Input Multiple Output) to the DL or UL. In addition, both the base station 10 and the terminal 20 can communicate via SCell (Secondary Cell) and PCell (Primary Cell) based on CA (Carrier Aggregation).

[0033] The terminal 20 is a communication device with a wireless communication function such as a smart phone, a mobile phone, a tablet computer, a wearable terminal, a communication module for M2M (Machine-to-Machine), etc. As Figure 1As shown, the terminal 20 receives control signals or data from the base station 10 via DL and sends control signals or data to the base station 10 via UL, thereby utilizing various communication services provided by the wireless communication system.

[0034] Figure 2 It is a diagram of the structure example (2) of the wireless communication system in the embodiment of the present invention. Figure 2 It shows a structural example of a wireless communication system in the case of performing NR-DC (NR-Dual connectivity). As Figure 2 shown, it has a base station 10A as the MN (Master Node) and a base station 10B as the SN (Secondary Node). The base station 10A and the base station 10B are respectively connected to the core network 30. The terminal 20 communicates with both the base station 10A and the base station 10B.

[0035] The cell group provided by the base station 10A as the MN is called the MCG (Master Cell Group), and the cell group provided by the base station 10B as the SN is called the SCG (Secondary Cell Group). The following operations can be carried out using Figure 1 and Figure 2 any structure.

[0036] As a system after 5G, research on Beyond 5G and 6G has begun. As candidates for research topics for Beyond 5G and 6G, the expansion of new frequency bands is being studied. For example, the new frequency bands are frequency bands above 100 GHz and the terahertz band, etc.

[0037] Figure 3 It is a diagram showing an example of the frequency band in the embodiment of the present invention. As Figure 3 shown, FR1 is defined as a frequency band with subcarrier spacings of {15, 30, 60} kHz, a bandwidth of 5 - 100 MHz, up to 7.125 GHz. In addition, as Figure 3 shown, FR2 is defined as a frequency band with subcarrier spacings of {60, 120, 240} kHz, a bandwidth of 50 - 400 MHz, up to 24.25 - 52.6 GHz. In addition, as Figure 3 shown, the frequency band of 52.6 - 71 GHz can be distinguished from FR2 and is called "FR2x" etc. as a new frequency range (FrequencyRange, FR), and the definition of the current FR2 (the frequency band of 24.25 GHz to 52.6 GHz) can be changed to include it in the changed FR2.

[0038] Research supports in NR version 17Figure 3 The frequency band of 52.6 - 71 GHz as shown. In addition, in NR Release 16, the frequency utilization status, use cases, and requirement specifications of 52.6 - 114.25 GHz in various countries were studied. Therefore, in NR releases after Release 18, it may be extended to support around 114 GHz.

[0039] For example, new parameter sets or new values of subcarrier spacing applied in frequency bands above 52.6 - 71 GHz are being studied. In addition, as technical elements that need to be suitable for the new parameter sets, for example, the UE processing time required for each of BWP (Bandwidth part), beam switching time, HARQ (Hybrid automatic repeat request) scheduling, PDSCH, PUSCH, SRS (Sounding reference signal), and CSI (Channel state information) are listed. In addition, in the licensed and unlicensed operations in this frequency band, support for up to 64 SSB (SS / PBCH block) beams has been studied.

[0040] In addition, for example, beam - based operations such as making the channel access mechanism in the 52.6 - 71 GHz frequency band suitable for requirements related to the restrictions in the 52.6 - 71 GHz unlicensed frequency band are envisioned.

[0041] Regarding the channel access mechanism, for example, it is necessary in several countries or regions in the operation of the 57 - 71 GHz unlicensed frequency band (for example, Non - Patent Document 3). Table 1 is an example of the requirement items in Europe.

[0042] Table 1

[0043]

[0044] As shown in Table 1, as Spectrum access and mitigation requirements, it is necessary to implement sufficient spectrum sharing mechanisms in the device, such as LBT, Detect and Avoid, etc.

[0045] Table 2 is an example of the requirement items in Japan.

[0046] Table 2

[0047]

[0048] As shown in Table 2, as spectrum access and mitigation requirements, a carrier sensing function is required for transmission power exceeding 10 dBm.

[0049] Release 16 NR-U defines a channel access mechanism in the 5 - 6 GHz band. This channel access mechanism is specifically designed for efficient coexistence with Wireless LAN (Local Area Network).

[0050] On the other hand, in the 52.6 - 71 GHz system of Release 17 NR, for example, coexistence with a broadband system with a bandwidth exceeding 2 GHz such as IEEE 802.11ad is envisioned. Table 3 shows an example of the specifications of this broadband system.

[0051] Table 3

[0052]

[0053] As shown in Table 3, this broadband system is a system with a channel bandwidth of 2.16 GHz and a center frequency near 60 GHz. This system is different from the conventional Wireless LAN in terms of system design and channel access mechanism.

[0054] Therefore, the channel access mechanism of Release 16 NR may not be suitable for the 52.6 - 71 GHz system of NR. For example, since the channel bandwidth of the conventional Wireless LAN is 20 MHz or an integer multiple of 20 MHz, the bandwidth of LBT in Release 16 NR is 20 MHz. However, the channel bandwidth of IEEE 802.11ad is 2.16 GHz, so in the 52.6 - 71 GHz system of NR, the bandwidth of LBT may be too narrow at 20 MHz. In addition, it is also necessary to consider that the 52.6 - 71 GHz system of NR is beam-based operation. In addition, "LBT" below can be replaced with "Channel access procedure" or "Sensing", etc.

[0055] Thus, in the unlicensed band above 52.6 GHz of NR (for example, 59 - 64 GHz, 57 - 66 GHz, 57 - 64 GHz, 57 - 71 GHz), a channel access mechanism different from that of the 5 GHz band or 6 GHz band can be applied.

[0056] Figure 4It is a flowchart showing an example of LBT-based transmission in an embodiment of the present invention. In step S1, the terminal 20 performs LBT in the bandwidth as the object. The LBT may include a random back-off operation based on a contention window. Then, the terminal 20 determines whether an idle state is detected. If an idle state is detected (Yes in S2), it proceeds to step S3. If an idle state is not detected (No in S2), it returns to step S1, or ends the process without transmission. In step S3, the terminal 20 performs transmission.

[0057] Figure 5 It is a diagram showing an example of the LBT bandwidth in an embodiment of the present invention. For example, unless indicated or set by the base station 10, the terminal 20 may assume the object bandwidth of the LBT to be any one of the following 1) to 5).

[0058] 1) BWP bandwidth

[0059] 2) Channel bandwidth

[0060] 3) The minimum channel bandwidth in the frequency band

[0061] 4) The minimum bandwidth among the above 1) to 3)

[0062] 5) The maximum bandwidth among the above 1) to 3)

[0063] In addition, the LBT bandwidth in the 52.6 - 71 GHz frequency band can be at least wider than 20 MHz in the 5 / 6 GHz frequency band. For example, as Figure 5 shown, LBT can be performed in a bandwidth of 200 MHz to 400 MHz, can also be performed in a bandwidth of 400 MHz to 800 MHz, can also be performed in a bandwidth of 2.16 GHz, and can be performed in a bandwidth wider or narrower than the BWP bandwidth.

[0064] In addition, the base station 10 can set the object bandwidth of the LBT. For example, as Figure 5 shown, the LBT bandwidth can be wider than the BWP bandwidth, can also be the same bandwidth as the channel bandwidth, or can also be the same bandwidth as the minimum channel bandwidth in the object frequency band (for example, a bandwidth narrower than the BWP bandwidth). In addition, the base station 10 can set multiple LBT frequency bands within the BWP or in a predetermined band. In addition, the base station 10 can set multiple LBT frequency bands within the BWP or in a predetermined band. When the base station 10 sets multiple LBT frequency bands, it can set a guard band where resource allocation cannot be performed between them, or can set multiple LBT frequency bands without a guard band.

[0065] In addition, the channel bandwidth can be, for example, 50 MHz, 100 MHz, 200 MHz, or 400 MHz, etc. Regarding the minimum channel bandwidth in the frequency band, when it is possible to set 50 MHz, 100 MHz, 200 MHz, or 400 MHz for the frequency band, it is, for example, 50 MHz.

[0066] Among them, the ED (Energy detection) threshold can be proportional to the LBT bandwidth. For example, when the bandwidth of other coexisting systems is 2.16 GHz, if the LBT bandwidth is 2.16 GHz, the ED threshold can be the same as that of other systems. In addition, for example, if the LBT bandwidth is 1 / X of the reference, the ED threshold is 1 / X times of the reference. Additionally, the ED threshold may not be a value proportional to the LBT bandwidth, or it may be a value based on the LBT bandwidth. For example, it may be a value obtained by adding or subtracting a predetermined value to or from a value proportional to the LBT bandwidth.

[0067] In addition, the listening slot period and / or the extension period in the frequency band above 52.6 GHz can be different from those in the 5 / 6 GHz frequency band. For example, the listening slot period and / or the extension period in the frequency band above 52.6 GHz can be shorter than 9 microseconds, or can be equal to the symbol length or an integer multiple of the symbol length.

[0068] In addition, the contention window size (e.g., the maximum contention window size) of type 1 channel access in the frequency band above 52.6 GHz can be different from the contention window size in the 5 / 6 GHz frequency band. Table 4 shows an example of the contention window size in the 5 / 6 GHz frequency band (e.g., Non-Patent Document 4).

[0069] Table 4

[0070]

[0071] The m shown in Table 4 p represents the number of listening slots, CW min，p represents the minimum value of the contention window size, CW max，p represents the maximum value of the contention window size, T mcot，p represents the Channel occupancy time, CW p represents the contention window size. In the frequency band above 52.6 GHz, for example, at least one of the following 1) to 6) can be applied. Additionally, m p represents the number of listening symbols.

[0072] 1) A smaller m p value

[0073] 2) A smaller CW min，pValue

[0074] 3) Smaller CW max，p Value

[0075] 4) Smaller number of CW p Value

[0076] 5) Smaller number of p, i.e., the number of Channel access priority classes

[0077] 6) Longer T mcot，p Value

[0078] In addition, the listening interval / gap in channel access types 2A / 2B / 2C in the frequency band above 52.6 GHz may be different from that in channel access types 2A / 2B / 2C in the 5 / 6 GHz frequency band. For example, the listening interval / gap may be shorter than the listening interval / gap in other frequency bands (e.g., 16 microseconds or 25 microseconds), or may be equal to the symbol length or an integer multiple of the symbol length.

[0079] Since a system using a higher frequency has a higher sampling rate to control a wider bandwidth, LBT can be performed during such a short gap as described above. The shorter LBT gap has the effect of reducing the overhead related to LBT.

[0080] In addition, due to the narrower coverage range caused by the higher frequency and the application of beamforming-based transmission, the possibility of detecting competition becomes smaller. Therefore, the contention window size can be shortened without significantly increasing the probability of transmission competition. The shorter contention window size has the effect of reducing the overhead related to LBT.

[0081] In addition, in LBT in the case of coexistence with a system such as IEEE802.11ad where the bandwidth has a large difference compared to NR, the ED threshold of NR may be too low. For example, when using this ED threshold, in the case where the IEEE802.11ad system is not set in the communication area, it may result in inefficient LBT operations.

[0082] Thus, in the unlicensed frequency band above 52.6 GHz of NR (e.g., 59 - 64 GHz, 57 - 66 GHz, 57 - 64 GHz, 57 - 71 GHz), in the detection in the case of coexistence of NR with NR, LBT that performs detection through a preamble can be executed.

[0083] In the NR system, a common preamble can be used, or it can be defined. For example, the preamble to be used can be selected from a set of preambles for identifying the operator. That is, the terminal 20 can identify the operator of NR by detecting the preamble. In addition, the set of preambles for identifying the operator (candidate set) can be set according to the setting information received from the base station 10 (e.g., RRC signaling). Furthermore, the selection of the preamble from this candidate set can be performed according to the indication information received from the base station 10.

[0084] The preamble can be an existing NR reference signal, etc. For example, any one of PSS, SSS, CSI-RS, PBCH-DM-RS, SRS, and PRACH signals can be used as the preamble, or a combination of these signals can be used as the preamble. Or, the preamble can be a new signal different from the existing NR reference signal.

[0085] In addition, for preamble detection and preamble transmission, the settings can be changed. For example, preamble detection can be performed according to each set bandwidth different from the ED-based LBT bandwidth. For example, when performing the ED-based LBT bandwidth in a band wider than the NR channel bandwidth, the PD (Preamble detection)-based LBT bandwidth can be performed according to each NR channel bandwidth.

[0086] In the case of using PSS and / or SSS as the preamble for performing PD-based LBT, the preamble can be transmitted according to each bandwidth for performing PD-based LBT. For example, the preamble can be transmitted according to each minimum channel bandwidth. In addition, the following operations 1) to 3) can be performed.

[0087] 1) The frequency-domain positions of the RBs (Resource blocks) of PSS and / or SSS for each channel bandwidth can be notified from the base station 10 to the terminal 20.

[0088] 2) The frequency-domain positions of the RBs of PSS and / or SSS for each channel bandwidth can be predefined by the specification. For example, it can be the center of the channel bandwidth, or the lower end or lower part of the band, or the upper end or upper part of the band.

[0089] 3) PSS and / or SSS can be repeatedly transmitted in the frequency domain within each channel bandwidth. In addition, the number of repetitions and / or the transmission cycle time can be set according to the setting information received from the base station 10.

[0090] In addition, for example, as a preamble for LBT, broadband transmission can be envisioned. For example, this broadband transmission can be transmission using the entire bandwidth of each channel or each minimum channel. Alternatively, the actually transmitted bandwidth can be set.

[0091] When performing PD-based LBT among multiple LBT bandwidths and a preamble is detected in at least one LBT bandwidth, transmission may not be allowed in all LBT bandwidths. Alternatively, transmission may also be allowed in LBT bandwidths other than the LBT bandwidth in which the preamble is detected.

[0092] As described above, by using a preamble for detection for system coexistence, even when the ED threshold is lower than the previous threshold, the detection probability during contention can be increased and an efficient LBT operation can be performed.

[0093] In addition, in the unlicensed band above 52.6 GHz in NR (for example, 59 - 64 GHz, 57 - 66 GHz, 57 - 64 GHz, 57 - 71 GHz), LBT can be performed on all antenna ports used for transmission.

[0094] For example, LBT can be performed for each antenna port. When no contention is detected in the LBT for all antenna ports, transmission may be allowed.

[0095] In addition, for example, LBT can be performed for each set of antenna ports. For example, LBT envisioning beams can be performed. For example, LBT can be performed for transmission using beamforming with the same antenna coefficients applied.

[0096] In addition, for example, LBT can be performed for multiple sets of antenna coefficients, such as for each set in beam scanning.

[0097] The above-mentioned "antenna coefficients" can be replaced with "spatial filters". For example, LBT can be performed for transmission using the same spatial filter. Or the above-mentioned "antenna coefficients" can be replaced with "QCL (Quasi-Co-Location) assumption". For example, LBT can be performed for transmission with the same QCL assumption.

[0098] Regarding the operation of performing the above LBT for each set of antenna ports, when the terminal 20 or the base station 10 supports beam correspondence, it may be allowed. That is, it can be defined that the LBT for each set of antenna ports must support beam correspondence. Or, in the frequency band above 52.6 GHz, for example, it can be set that all base stations 10 and terminals 20 must support beam correspondence.

[0099] In addition, the "52.6 - 71 GHz band", "band above 52.6 GHz", etc. in the above embodiments are just examples, and the above embodiments can also be applied in higher or lower frequency bands.

[0100] Through the above embodiments, the terminal 20 can improve the contention detection probability and communication efficiency even when the ED threshold is set lower than before due to supporting a wide bandwidth by performing LBT using a preamble in the NR system.

[0101] That is, in a wireless communication system, the accuracy of LBT (Listen before talk) can be improved.

[0102] (Functional structure)

[0103] Next, an example of the functional structures of the base station 10 and the terminal 20 that implement the above-described processes and operations will be described. The base station 10 and the terminal 20 include the functions of implementing the above embodiments. However, the base station 10 and the terminal 20 may each only have a part of the functions in the embodiments.

[0104] <Base station 10>

[0105] Figure 6 is a diagram showing an example of the functional structure of the base station 10 in an embodiment of the present invention. As Figure 6 shown, the base station 10 has a transmission unit 110, a reception unit 120, a setting unit 130, and a control unit 140. Figure 6 The functional structure shown is just an example. As long as the actions related to the embodiment of the present invention can be performed, the functional division and the names of the functional units can be arbitrary.

[0106] The transmission unit 110 includes the function of generating a signal to be transmitted to the terminal 20 side and transmitting the signal wirelessly. In addition, the transmission unit 110 transmits inter-network node messages to other network nodes. The reception unit 120 includes the function of wirelessly receiving various signals transmitted from the terminal 20 and obtaining, for example, higher-layer information from the received signals. In addition, the transmission unit 110 has the function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, and reference signals, etc. to the terminal 20. In addition, the reception unit 120 receives inter-network node messages from other network nodes. The transmission unit 110 and the reception unit 120 can be regarded as a communication unit together.

[0107] The setting unit 130 stores preset setting information and various setting information to be transmitted to the terminal 20 in a storage device, and reads them out from the storage device as needed. The content of the setting information is, for example, information required for LBT, etc.

[0108] As described in the embodiments, the control unit 140 performs control related to LBT. The functional unit related to signal transmission in the control unit 140 may be included in the transmission unit 110, and the functional unit related to signal reception in the control unit 140 may be included in the reception unit 120.

[0109] <Terminal 20>

[0110] Figure 7 FIG. is an example showing the functional structure of the terminal 20 in the embodiment of the present invention. As Figure 7 shown, the terminal 20 includes a transmission unit 210, a reception unit 220, a setting unit 230, and a control unit 240. Figure 7 The functional structure shown is only an example. As long as the operations involved in the embodiments of the present invention can be performed, the functional division and the names of the functional units can be arbitrary.

[0111] The transmission unit 210 has a function of generating a transmission signal based on transmission data and wirelessly transmitting the transmission signal. The reception unit 220 wirelessly receives various signals and obtains higher-layer signals from the received physical layer signals. In addition, the reception unit 220 has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals, etc. transmitted from the base station 10. Further, for example, the transmission unit 210 transmits PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Broadcast Channel), etc. to other terminals 20 as D2D communication, and the reception unit 220 receives PSCCH, PSSCH, PSDCH, or PSBCH, etc. from other terminals 20. The transmission unit 210 and the reception unit 220 may be collectively referred to as a communication unit.

[0112] The setting unit 230 stores various setting information received from the base station 10 or the terminal 20 by the reception unit 220 in a storage device and reads it out from the storage device as needed. In addition, the setting unit 230 also stores preset setting information. The content of the setting information is, for example, information required for LBT.

[0113] As described in the embodiments, the control unit 240 performs control related to LBT. Additionally, the functional unit related to signal transmission in the control unit 240 may be included in the transmission unit 210, and the functional unit related to signal reception in the control unit 240 may be included in the reception unit 220.

[0114] (Hardware Structure)

[0115] The block diagrams ( Figure 6 and Figure 7 ) used in the above description of the embodiments show blocks in terms of functions. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block may be implemented using a single device physically or logically combined, or two or more physically or logically separated devices may be directly or indirectly (e.g., using wired, wireless, etc.) connected and these multiple devices may be used for implementation. The functional block may also be implemented by combining software with the above single device or the above multiple devices.

[0116] Functionally, it has judgment, decision-making, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, regarded as, broadcasting, notification, communication, forwarding, configuration, reconfiguration, allocation (allocating, mapping), assignment, etc., but is not limited to these. For example, the functional block (structural unit) that enables transmission to function is called a transmitting unit or a transmitter. In short, as described above, there is no particular limitation on the implementation method.

[0117] For example, the base station 10, the terminal 20, etc. in an embodiment of the present disclosure may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Figure 8 FIG. is an example showing the hardware structure of the base station 10 and the terminal 20 according to an embodiment of the present disclosure. The above base station 10 and terminal 20 may also be configured as a computer device physically 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, and a bus 1007, etc.

[0118] In addition, in the following description, the term "apparatus" may be replaced with "circuit", "device", "unit", etc. The hardware structures of the base station 10 and the terminal 20 may be configured to include one or more of the apparatuses shown in the accompanying drawings, or may be configured not to include some of the apparatuses.

[0119] The respective functions in the base station 10 and the terminal 20 are implemented by the following method: A predetermined software (program) is read into hardware such as the processor 1001 and the storage device 1002, so that the processor 1001 performs operations and controls at least one of the communication of the communication device 1004 or the reading and writing of data in the storage device 1002 and the auxiliary storage device 1003.

[0120] The processor 1001, for example, operates the operating system to control the entire computer. The processor 1001 may also be constituted by a central processing unit (CPU: Central Processing Unit) including an interface with peripheral devices, a control device, an arithmetic device, registers, etc. For example, the above-described control units 140, 240, etc. may also be implemented by the processor 1001.

[0121] In addition, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and performs various processes based on this. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments is used. For example, Figure 6 The control unit 140 of the base station 10 shown may also be implemented by a control program stored in the storage device 1002 and operating through the processor 1001. In addition, for example, Figure 7 The control unit 240 of the terminal 20 shown may also be implemented by a control program stored in the storage device 1002 and operating through the processor 1001. Regarding the above-described various processes, although it has been described that the above-described various processes are executed by one processor 1001, the above-described various processes may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may also be implemented by one or more chips. In addition, the program may also be sent from a network via a telecommunication line.

[0122] The storage device 1002 is a computer-readable recording medium, and can be constituted by at least one of, for example, a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), etc. The storage device 1002 can also be referred to as a register, a cache, a main memory (main storage device), etc. The storage device 1002 can store a program (program code), a software module, etc. that can be executed in order to implement the communication method according to an embodiment of the present disclosure.

[0123] The auxiliary storage device 1003 is a computer-readable recording medium, and can be constituted by at least one of, for example, an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disc (e.g., a compact disc, a digital versatile disc, a Blu-ray (registered trademark) disc, a smart card, a flash memory (e.g., a card, a stick, a key drive (Key drive)), a Floppy (registered trademark) disk, a magnetic stripe, etc. The above-mentioned recording medium can be, for example, a database, a server, or other appropriate media including at least one of the storage device 1002 and the auxiliary storage device 1003.

[0124] The communication device 1004 is a hardware (transceiver device) for communicating between computers via at least one of a wired network and a wireless network. For example, it can also be referred to as a network device, a network controller, a network card, a communication module, etc. The communication device 1004 can be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of frequency division duplex (FDD: Frequency Division Duplex) and time division duplex (TDD: Time Division Duplex). For example, a transceiver antenna, an amplifier unit, a transceiver unit, a transmission path interface, etc. can also be implemented by the communication device 1004. For the transceiver unit, physical or logical separation can be implemented in the transmission unit and the reception unit.

[0125] The input device 1005 is an input device that accepts input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that performs output to the outside (e.g., a display, a speaker, an LED lamp, etc.). In addition, the input device 1005 and the output device 1006 can also be integrally constituted (e.g., a touch panel).

[0126] In addition, devices such as the processor 1001 and the storage device 1002 are connected by a bus 1007 for communicating information. The bus 1007 may be constituted by a single bus or may be constituted by different buses for each device pair.

[0127] In addition, 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), and a field programmable gate array (FPGA), and part or all of the functional blocks may be implemented by this hardware. For example, the processor 1001 may also be implemented using at least one of these hardware components.

[0128] (Summary of the Embodiment)

[0129] As described above, according to an embodiment of the present invention, a terminal is provided, which has: a control unit that performs LBT (Listen before talk) in a band above a predetermined frequency; and a transmission unit that transmits a signal based on the result of the LBT, and the control unit performs LBT by detecting a preamble.

[0130] With the above structure, when coexisting with a system using a higher frequency or a wider band compared to the prior art, the terminal 20 can improve the communication efficiency by performing LBT adapted to the system. That is, in a wireless communication system, LBT (Listen before talk) adapted to the coexisting wireless communication system can be performed.

[0131] The control unit may perform LBT by detecting a common preamble in NR (New Radio). With this structure, when coexisting with a system using a higher frequency or a wider band compared to the prior art, the terminal 20 can improve the communication efficiency by performing LBT adapted to the system.

[0132] The control unit may perform LBT by detecting at least any one of a plurality of preambles. With this structure, when coexisting with a system using a higher frequency or a wider band compared to the prior art, the terminal 20 can improve the communication efficiency by performing LBT adapted to the system.

[0133] The control unit can perform LBT by detecting a preamble composed of the synchronization signal or reference signal of NR. With this configuration, when coexisting with a system operating at a higher frequency or a wider bandwidth compared to the prior art, the terminal 20 can improve the communication efficiency by performing LBT adapted to this system.

[0134] The control unit can perform LBT by detecting a preamble formed by repeatedly arranging the synchronization signal of NR in the frequency domain. With this configuration, when the system uses beams, the terminal 20 can improve the communication efficiency by performing LBT adapted to this system.

[0135] In addition, according to an embodiment of the present invention, there is provided a communication method, in which the communication method is executed by a terminal and includes the following steps: a control step of performing LBT (Listen before talk) in a frequency band above a predetermined frequency; and a transmission step of transmitting a signal according to the result of the LBT, wherein the control step includes a step of performing LBT by detecting a preamble.

[0136] With the above configuration, when coexisting with a system operating at a higher frequency or a wider bandwidth compared to the prior art, the terminal 20 can improve the communication efficiency by performing LBT adapted to this system. That is, in a wireless communication system, it is possible to perform LBT (Listen before talk) adapted to the coexisting wireless communication system.

[0137] (Supplement of the embodiment)

[0138] The above has described the embodiments of the present invention. However, the disclosed invention is not limited to such embodiments, and those of ordinary skill in the art should understand various variations, modifications, substitution examples, replacement examples, etc. Specific numerical examples have been used for the purpose of facilitating the understanding of the invention, but these numerical values are only examples and any appropriate arbitrary values can be used as long as not specifically indicated. The distinction of items in the above description is not essential for the present invention. The matters described in two or more items can be combined as needed, or the matters described in one item can be applied to the matters described in other items (as long as there is no contradiction). The boundary of the functional units or processing units in the functional block diagram does not necessarily correspond to the boundary of the physical components. The operations of multiple functional units can be physically performed by one component, or the operation of one functional unit can be physically performed by multiple components. Regarding the processing procedures described in the embodiments, the order of processing can be swapped without contradiction. For the convenience of explaining the processing, the base station 10 and the terminal 20 are described using a functional block diagram, but such devices can also be implemented in hardware, software, or a combination thereof. The software that operates through the processor of the base station 10 according to the embodiments of the present invention and the software that operates through the processor of the terminal 20 according to the embodiments of the present invention can also be stored in a random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, register, hard disk drive (HDD), removable disk, CD-ROM, database, server, and other appropriate arbitrary storage media respectively.

[0139] In addition, the notification of information is not limited to the forms / embodiments described in this disclosure, and other methods can also be used. For example, the notification of information can be implemented through physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), high layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or a combination thereof. In addition, the RRC signaling can also be referred to as an RRC message. For example, it can also be an RRC connection setup message, an RRC connection reconfiguration message, etc.

[0140] Each form / embodiment described in the present disclosure can also be applied to at least one of LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, UMB (UltraMobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), systems using other appropriate systems, and next-generation systems extended therefrom. In addition, multiple systems (for example, a combination of at least one of LTE and LTE-A and 5G, etc.) can be combined and applied.

[0141] For the processing procedures, timings, flows, etc. of each form / embodiment described in this specification, the order can be changed without contradiction. For example, for the methods described in the present disclosure, the order of illustration indicates the elements of various steps, but is not limited to the specific order indicated.

[0142] In this specification, specific actions performed by the base station 10 may be performed by its upper node according to circumstances. In a network composed of one or more network nodes having the base station 10, it is obvious that various actions performed for communicating with the terminal 20 can be performed by at least one of the base station 10 and other network nodes other than the base station 10 (for example, MME or S-GW is considered, but not limited to these). In the above, the case where there is one other network node other than the base station 10 is illustrated, but the other network nodes may also be a combination of multiple other network nodes (for example, MME and S-GW).

[0143] The information or signals, etc. described in the present disclosure can be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). They can also be input or output via multiple network nodes.

[0144] The input or output information, etc. can be stored in a specific location (e.g., memory), or can be managed using a management table. The input or output information, etc. can be rewritten, updated, or appended. The output information, etc. can also be deleted. The input information, etc. can also be sent to other devices.

[0145] The determination in the present disclosure can be made by a value represented by 1 bit (0 or 1), can also be made by a Boolean value (true or false), and can also be made by a comparison of numerical values (e.g., comparison with a predetermined value).

[0146] For software, no matter it is called software, firmware, middleware, microcode, hardware description language, or is called by other names, it should be widely interpreted as referring to commands, command sets, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, processes, functions, etc.

[0147] In addition, software, commands, information, etc. can be transmitted and received via a transmission medium. For example, when using at least one of wired technologies (coaxial cables, fiber optic cables, twisted pairs, digital subscriber lines (DSL), etc.) and wireless technologies (infrared rays, microwaves, etc.) to send software from a web page, server, or other remote source, at least one of these wired technologies and wireless technologies is included in the definition of the transmission medium.

[0148] The information, signals, etc. described in the present disclosure can also be represented using any one of various different technologies. For example, the data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be involved in the whole above description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination of these.

[0149] In addition, the terms described in the present disclosure and the terms required to understand the present disclosure can be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol can also be a signal (signaling). In addition, a signal can also be a message. Additionally, a component carrier (CC) can be called a carrier frequency, a cell, a frequency carrier, etc.

[0150] Terms such as "system" and "network" used in the present disclosure can be used interchangeably.

[0151] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, may be represented by relative values with respect to a predetermined value, or may be represented by other corresponding information. For example, radio resources may also be indicated by indices.

[0152] The names used for the above parameters are non-restrictive in any aspect. Furthermore, mathematical expressions using these parameters may sometimes be different from the content explicitly shown in the present disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by appropriate names, and thus the various names assigned to these various channels and information elements are non-restrictive in any aspect.

[0153] In the present disclosure, terms such as "base station (BS: Base Station)", "radio base station", "base station apparatus", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier", etc. can be used interchangeably. Sometimes, base stations are also referred to as macro cells, small cells, femto cells, pico cells, etc.

[0154] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each of these smaller areas can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (RRH: Remote Radio Head)). Terms such as "cell" or "sector" refer to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within that coverage range.

[0155] In the present disclosure, terms such as "mobile station (MS: Mobile Station)", "user terminal", "user equipment (UE: User Equipment)", "terminal", etc. can be used interchangeably.

[0156] For mobile stations, those skilled in the art sometimes also use the following terms to refer to them: subscriber stations, mobile units, subscriber units, radio units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals, handsets, user agents, mobile clients, clients, or some other appropriate terms.

[0157] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., an automobile, an airplane, etc.), may also be a moving body that moves in an unmanned manner (e.g., a drone, a self-driving car, etc.), or may also be a robot (humanoid or non-humanoid). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0158] In addition, the base station in the present disclosure may also be replaced by a user terminal. For example, regarding a structure in which communication between a base station and a user terminal is replaced by communication between multiple terminals 20 (e.g., it may also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything) system, etc.), various forms / embodiments of the present disclosure can also be applied. In this case, it may also be configured such that the terminal 20 has the functions of the above-described base station 10. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to inter-terminal communication (e.g., "side"). For example, an uplink channel, a downlink channel, etc. can also be replaced by a side channel.

[0159] Similarly, the user terminal in the present disclosure can be replaced by a base station. In this case, it may also be configured such that the base station has the functions of the above-described user terminal.

[0160] As used in this disclosure, terms such as "determining" and "deciding" sometimes also include situations involving a variety of actions. For example, "determining" and "deciding" can include cases where something that has been judged, calculated, computed, processed, derived, investigated, looked up (e.g., searched in a table, database, or other data structure), or ascertained is regarded as having been "determined" or "decided". In addition, "determining" and "deciding" can include cases where something that has been received (e.g., received information), transmitted (e.g., transmitted information), input, output, or accessed (e.g., accessed data in memory) is regarded as something that has been "determined" or "decided". Further, "determining" and "deciding" can include cases where something that has been resolved, selected, chosen, established, or compared is regarded as something that has been "determined" or "decided". That is, "determining" and "deciding" can include anything that has "determined" or "decided" on any action. In addition, "determine (decide)" can be replaced with "assuming", "expecting", "considering", etc.

[0161] Terms such as "connected" and "coupled", or any variations of these terms, are intended to represent all direct or indirect connections or couplings between two or more elements, and can include cases where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The coupling or connection between elements can be a physical coupling or connection, a logical coupling or connection, or a combination of these. For example, "Access" can be used to replace "connected". When used in this disclosure, for two elements, it can be considered that they are "connected" or "coupled" to each other by using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-inclusive examples, by using electromagnetic energy such as electromagnetic energy having wavelengths in the radio frequency domain, microwave region, and optical (including both visible and invisible) regions.

[0162] A reference signal can be abbreviated as RS (Reference Signal), or can be called a pilot according to the applied standard.

[0163] In the present disclosure, the description such as "according to" is not meant to be "only according to" unless otherwise clearly stated. In other words, the description "according to" means both "only according to" and "at least according to".

[0164] Any reference to elements using designations such as "first", "second", etc. used in the present disclosure does not entirely limit the quantity and order of these elements. These designations are used in the present disclosure as a simple method for distinguishing between two or more elements. Therefore, the reference to the first and second elements does not mean that only two elements can be adopted here or that the first element must precede the second element in any form.

[0165] The "unit" in the above-described device structures can be replaced with "section", "circuit", "device", etc.

[0166] When "include", "including" and their variants are used in the present disclosure, these terms mean inclusive in the same way as the term "comprising". Also, the term "or" used in the present disclosure does not mean exclusive or.

[0167] A radio frame can be composed of one or more frames in the time domain. One or more respective frames in the time domain can also be called sub-frames. A sub-frame can also be composed of one or more time slots in the time domain. A sub-frame can be a fixed time length (e.g., 1 ms) independent of the numerology.

[0168] The numerology can also be communication parameters applied to at least one of transmission and reception of a certain signal or channel. The numerology can represent, for example, at least one of sub-carrier spacing (SCS: SubCarrier Spacing), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), number of symbols per TTI, radio frame structure, specific filtering processing performed by a transceiver in the frequency domain, specific windowing processing performed by a transceiver in the time domain, etc.

[0169] A time slot can be composed of one or more symbols (such as OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A time slot can be a time unit based on a parameter set.

[0170] A time slot can also contain multiple mini-slots. Each mini-slot can be composed of one or more symbols in the time domain. In addition, a mini-slot can also be referred to as a sub-slot. A mini-slot can also be composed of fewer symbols than a time slot. The PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot can also be referred to as PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using a mini-slot can also be referred to as PDSCH (or PUSCH) mapping type B.

[0171] A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol all represent time units when transmitting a signal. A radio frame, a sub-frame, a time slot, a mini-slot, and a symbol can also use their respective other names.

[0172] For example, 1 sub-frame can also be referred to as a Transmission Time Interval (TTI), multiple consecutive sub-frames can also be referred to as a TTI, and 1 time slot or 1 mini-slot can also be referred to as a TTI. That is, at least one of the sub-frame and the TTI can be a sub-frame (1 ms) in the existing LTE, can also be a period shorter than 1 ms (for example, 1 - 13 symbols), or can also be a period longer than 1 ms. In addition, the unit representing the TTI can also be not a sub-frame but be referred to as a time slot, a mini-slot, etc.

[0173] Here, the TTI is, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as the frequency domain width and transmission power that can be used in each terminal 20) to each terminal 20 in units of TTI. In addition, the definition of the TTI is not limited to this.

[0174] The TTI can be a transmission time unit for a data packet (transmission block), a code block, a codeword, etc. after channel coding, or can also be a processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the actual time interval (such as the number of symbols) to which a transmission block, a code block, a codeword, etc. are mapped can also be shorter than the TTI.

[0175] In addition, when one time slot or one mini time slot is called a TTI, more than one TTI (i.e., more than one time slot or more than one mini time slot) can also constitute the minimum time unit for scheduling. Additionally, the number of time slots (number of mini time slots) that constitute the minimum time unit for this scheduling can also be controlled.

[0176] A TTI with a time length of 1 ms can be called a normal TTI (TTI in LTE Rel.8 - 12), a usual TTI, a long TTI, a normal subframe, a usual subframe, a long subframe, a time slot, etc. A TTI shorter than the usual TTI can be called a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub - time slot, a time slot, etc.

[0177] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) can be replaced by a TTI with a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) can also be replaced by a TTI with a TTI length less than that of the long TTI and 1 ms or more.

[0178] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain. In the frequency domain, it can also contain one or more consecutive subcarriers. The number of subcarriers contained in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers contained in an RB can be determined based on the parameter set.

[0179] In addition, the time domain of an RB can contain one or more symbols, and can also be the length of 1 time slot, 1 mini time slot, 1 subframe, or 1 TTI. 1 TTI, 1 subframe, etc. can also be composed of one or more resource blocks respectively.

[0180] In addition, one or more RBs can also be called a physical resource block (PRB: Physical RB), a sub - carrier group (SCG: Sub - Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, etc.

[0181] In addition, a resource block can also be composed of one or more resource elements (RE: Resource Element). For example, 1 RE can also be a radio resource area of 1 subcarrier and 1 symbol.

[0182] A bandwidth part (BWP) (which may also be referred to as partial bandwidth, etc.) in a certain carrier can also represent a subset of consecutive common resource blocks (RB) used for a certain parameter set. Herein, the common RB can also be determined by the index of the RB based on the common reference point of the carrier. A PRB can also be defined by a certain BWP and numbered within that BWP.

[0183] The BWP can also include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). For a UE, one or more BWPs can also be set within one carrier.

[0184] At least one of the set BWPs can also be active, and the UE may not assume to transmit and receive predetermined signals / channels outside the active BWP. In addition, in this disclosure, "cell", "carrier", etc. can also be replaced with "BWP".

[0185] The structures of the above-mentioned radio frames, subframes, time slots, mini-slots, and symbols, etc. are merely illustrative. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-slots included in a time slot, the number of symbols and RBs included in a time slot or mini-slot, the number of subcarriers included in an RB, and the number of symbols, symbol length, cyclic prefix (CP) length, etc. within a TTI can be variously changed.

[0186] In this disclosure, for example, when articles are added through translation as in the case of a, an, and the in English, this disclosure also includes the case where the nouns following these articles are in the plural form.

[0187] In this disclosure, an expression such as "A and B are different" can also mean "A and B are different from each other". Additionally, this expression can also mean "A and B are respectively different from C". Expressions such as "separate", "combine", etc. can be similarly interpreted as "different".

[0188] Each form / embodiment described in this disclosure can be used alone, combined, or switched according to execution. In addition, the notification of predetermined information is not limited to being explicitly (e.g., notification of "is X") carried out, and can also be implicitly (e.g., without notification of the predetermined information) carried out.

[0189] In addition, in this disclosure, OFDM is an example of a multi-carrier signal.

[0190] As described above, the present disclosure has been described in detail. However, for those skilled in the art, it should be clear that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented in the form of modifications and changes without departing from the gist and scope of the present disclosure determined by the claims. Therefore, the purpose of the description of the present disclosure is to illustrate, and it has no restrictive meaning for the present disclosure.

[0191] Reference numeral description:

[0192] 10 Base station

[0193] 110 Transmitting unit

[0194] 120 Receiving unit

[0195] 130 Setting unit

[0196] 140 Control unit

[0197] 20 Terminal

[0198] 210 Transmitting unit

[0199] 220 Receiving unit

[0200] 230 Setting unit

[0201] 240 Control unit

[0202] 30 Core network

[0203] 1001 Processor

[0204] 1002 Storage device

[0205] 1003 Auxiliary storage device

[0206] 1004 Communication device

[0207] 1005 Input device

[0208] 1006 Output device

Claims

1. A terminal, wherein, the terminal has: a control unit that performs LBT (Listen Before Talk) in a band above a predetermined frequency; and a transmission unit that transmits a signal based on the result of the LBT, the control unit performs the LBT with the bandwidth of a BWP (Bandwidth Part), sets the ED (Energy Detection) threshold applied to the LBT to a value obtained by adding a predetermined value to a value proportional to the bandwidth in which the LBT is performed, and applies a listening time slot shorter than the listening time slot applied to the LBT performed in a band below the predetermined frequency during the LBT, wherein the BWP is a bandwidth part and the ED is energy detection.

2. The terminal according to claim 1, wherein, the control unit applies an extension period shorter than the extension period applied to the LBT performed in a band below the predetermined frequency during the LBT performed in the band above the predetermined frequency.

3. The terminal according to claim 1, wherein, when the LBT performed by the control unit in the band above the predetermined frequency is of channel access type 2, the control unit applies a listening interval shorter than the listening interval applied to the LBT performed in a band below the predetermined frequency during the LBT performed in the band above the predetermined frequency.

4. A communication method, wherein, the communication method is executed by a terminal as follows: performing LBT (Listen Before Talk) in a band above a predetermined frequency; transmitting a signal based on the result of the LBT; performing the LBT with the bandwidth of a BWP (Bandwidth Part), wherein the BWP is a bandwidth part; and setting the ED (Energy Detection) threshold applied to the LBT to a value obtained by adding a predetermined value to a value proportional to the bandwidth in which the LBT is performed, and applying a listening time slot shorter than the listening time slot applied to the LBT performed in a band below the predetermined frequency during the LBT, wherein the ED is energy detection.

Images