Terminals, communication methods, and communication systems

Abstract

This terminal comprises: a reception unit that receives control information for scheduling a resource for inter-terminal direct communication in an unlicensed band from a base station in a licensed band and receives, from another terminal, information regarding sharing of a COT (Channel occupancy time) that is applied to the inter-terminal direct communication; a control unit that determines, on the basis of the information regarding the sharing of the COT, an LBT (Listen before talk) method that is applied to transmission using the scheduled resource; and a transmission unit that transmits a signal for the inter-terminal direct communication when the LBT is successful.

Description

[Technical Field]

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

[0002] In LTE (Long Term Evolution) and its successor systems (e.g., LTE-A (LTE Advanced), NR (New Radio) (also known as 5G)), D2D (Device to Device) technology, which allows terminals to communicate directly with each other without going through a base station, is being considered (e.g., Non-Patent Document 1).

[0003] D2D reduces traffic between terminals and base stations, enabling communication between terminals even if base stations become inoperable during disasters or other emergencies. While 3GPP (3rd Generation Partnership Project) refers to D2D as "sidelink," this specification uses the more general term D2D. However, the term sidelink will also be used as needed in the descriptions of embodiments later.

[0004] D2D communication is broadly divided into D2D discovery (also called D2D discovery) for finding other terminals that can communicate, and D2D direct communication (also called D2D communication, terminal-to-terminal direct communication, etc.) for direct communication between terminals. In the following, unless specifically distinguished, D2D communication, D2D discovery, etc., will simply be referred to as D2D. Also, signals transmitted and received via D2D will be called D2D signals. Various use cases for V2X (Vehicle to Everything) services in NR are being considered (for example, Non-Patent Document 2).

[0005] Also, in NR Release 17 (for example, Non-Patent Document 3), using a higher frequency band than the conventional releases has been considered. For example, applicable numerologies including subcarrier spacing, channel bandwidth, etc. in the frequency band from 52.6 GHz to 71 GHz, the design of the physical layer, and obstacles assumed in actual wireless communication have been studied.

Prior Art Documents

Non-Patent Documents

[0006]

Non-Patent Document 1

Non-Patent Document 2

Non-Patent Document 3

Non-Patent Document 4

Non-Patent Document 5

Summary of the Invention

Problems to be Solved by the Invention

[0007] In a frequency band that uses a newly operated higher frequency than before, an unlicensed band is defined. In the unlicensed band, various regulations are defined. For example, LBT (Listen before talk) is executed when accessing a channel. When performing D2D communication in the high frequency band, operations that comply with the regulations in the unlicensed band are required. On the other hand, when the base station schedules resources in the unlicensed band from the licensed band, the base station may not be able to grasp the channel status of the unlicensed band.

[0008] The present invention has been made in view of the above points, and an object thereof is to schedule resources for direct communication between terminals in an unlicensed band from a licensed band by a base station.

Means for Solving the Problems

[0009] According to the disclosed technology, Frequency bands to which LBT (Listen before talk) applies scheduling resources for direct communication between terminals in Therefore, it does not include the specific instruction field related to the LBT. receiving control information from a base station in a licensed band, The aforementioned a receiving unit that receives information related to sharing of COT (Channel occupancy time) applied to direct communication between terminals from other terminals, and an LB T direction a control unit that determines a method to be applied to transmission using the scheduled resources based on the information related to the sharing of the COT, and a transmission unit that transmits a signal for direct communication between terminals when the LBT is successful and, A terminal having the above is provided.

Effects of the Invention

[0010] According to the disclosed technology, a base station can schedule resources for direct communication between terminals in an unlicensed band from a licensed band.

Brief Description of the Drawings

[0011] [Figure 1] It is a diagram for explaining V2X. [Figure 2] It is a diagram showing an example of a sensing operation. [Figure 3] It is a flowchart for explaining an example of a preemption operation. [Figure 4] It is a diagram showing an example of a preemption operation. [Figure 5] It is a diagram showing an example of a frequency range in an embodiment of the present invention. [Figure 6] It is a diagram for explaining an example (1) of LBT. [Figure 7]This is a diagram to explain the LBT example (2). [Figure 8] This is a diagram to explain the LBT example (3). [Figure 9] This is a diagram illustrating an example of direct communication between terminals. [Figure 10] This figure illustrates an example (1) of direct communication between terminals in an embodiment of the present invention. [Figure 11] This figure illustrates an example (2) of direct communication between terminals in an embodiment of the present invention. [Figure 12] This figure shows an example of the functional configuration of the base station 10 in an embodiment of the present invention. [Figure 13] This figure shows an example of the functional configuration of terminal 20 in an embodiment of the present invention. [Figure 14] This figure shows an example of the hardware configuration of a base station 10 or terminal 20 in an embodiment of the present invention. [Figure 15] This figure shows an example of the configuration of a vehicle 2001 in an embodiment of the present invention. [Modes for carrying out the invention]

[0012] Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to those described below.

[0013] In the operation of the wireless communication system according to the embodiments of the present invention, existing technologies may be used as appropriate. However, such existing technologies include, for example, existing LTE, but are not limited to existing LTE. Furthermore, the term "LTE" as used herein has a broad meaning that includes LTE-Advanced and LTE-Advanced and later methods (e.g., NR), or wireless LAN (Local Area Network), unless otherwise specified.

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

[0015] Furthermore, in the embodiments of the present invention, "configuring" wireless parameters may mean that predetermined values ​​are pre-configured, or that wireless parameters notified from the base station 10 or terminal 20 are configured.

[0016] Figure 1 is a diagram illustrating V2X. 3GPP is considering and working on specifications to realize V2X (Vehicle to Everything) or eV2X (enhanced V2X) by extending D2D functionality. As shown in Figure 1, V2X is a part of ITS (Intelligent Transport Systems) and is a general term encompassing V2V (Vehicle to Vehicle), which refers to communication between vehicles; V2I (Vehicle to Infrastructure), which refers to communication between vehicles and roadside units (RSUs) installed along the roadside; V2N (Vehicle to Network), which refers to communication between vehicles and ITS servers; and V2P (Vehicle to Pedestrian), which refers to communication between vehicles and mobile terminals carried by pedestrians.

[0017] Furthermore, 3GPP is considering V2X using LTE or NR cellular communication and terminal-to-terminal communication. V2X using cellular communication is also called cellular V2X. For NR V2X, research is underway to achieve high capacity, low latency, high reliability, and QoS (Quality of Service) control.

[0018] Regarding LTE or NR V2X, it is anticipated that future considerations will extend beyond 3GPP specifications. For example, it is expected that considerations will be given to ensuring interoperability, reducing costs through the implementation of higher layers, methods for using or switching between multiple RATs (Radio Access Technologies), compliance with regulations in various countries, and methods for data acquisition, distribution, database management, and utilization of LTE or NR V2X platforms.

[0019] While the embodiments of the present invention primarily envision a configuration in which the communication device is mounted on a vehicle, the embodiments of the present invention are not limited to this configuration. For example, the communication device may be a terminal held by a person, a device mounted on a drone or aircraft, or a base station, RSU, relay station (relay node), terminal with scheduling capabilities, etc.

[0020] Furthermore, SL (Sidelink) may be distinguished from UL (Uplink) or DL ​​(Downlink) based on any one or a combination of the following 1)-4). Also, SL may have other names. 1) Resource allocation in the time domain 2) Resource allocation in the frequency domain 3) Reference synchronization signals (including SLSS (Sidelink Synchronization Signal)) 4) Reference signal used for path loss measurement for transmit power control

[0021] Furthermore, with respect to SL or UL OFDM (Orthogonal Frequency Division Multiplexing), any of the following may be applied: CP-OFDM (Cyclic-Prefix OFDM), DFT-S-OFDM (Discrete Fourier Transform - Spread - OFDM), OFDM without transform precoding, or OFDM with transform precoding.

[0022] In LTE's Downlink Service Line (SL), Mode 3 and Mode 4 are defined for allocating SL resources to terminal 20. In Mode 3, transmission resources are dynamically allocated via DCI (Downlink Control Information) sent from base station 10 to terminal 20. Semi-Persistent Scheduling (SPS) is also possible in Mode 3. In Mode 4, terminal 20 autonomously selects transmission resources from the resource pool.

[0023] In NR's Sidelink Service Level (SL), Mode 1 and Mode 2 are defined for the allocation of SL resources to terminal 20. In Mode 1, transmission resources are dynamically allocated based on DCI (Downlink Control Information) transmitted from base station 10 to terminal 20. SL-CG (Sidelink Configured Grant) is also possible in Mode 1. In Mode 2, terminal 20 autonomously selects transmission resources from the resource pool based on reservation signals transmitted from other terminals 20 (sidelink sensing).

[0024] In the embodiments of the present invention, the term "slot" may be interpreted as a symbol, mini-slot, subframe, wireless frame, or TTI (Transmission Time Interval). Furthermore, in the embodiments of the present invention, the term "cell" may be interpreted as a cell group, carrier component, BWP, resource pool, resource, RAT (Radio Access Technology), system (including wireless LAN), etc.

[0025] In the embodiments of the present invention, terminal 20 is not limited to a V2X terminal, but may be any type of terminal that performs D2D communication. For example, terminal 20 may be a user-owned terminal such as a smartphone, or it may be an IoT (Internet of Things) device such as a smart meter.

[0026] Figure 2 shows an example of sensing operation in NR. In Resource allocation mode 2, terminal 20 selects and transmits a resource. As shown in Figure 2, terminal 20 performs sensing in the sensing window within the resource pool. Through sensing, terminal 20 receives resource reservation or resource assignment fields included in the SCI transmitted from other terminals 20, and identifies available resource candidates in the resource selection window within the resource pool based on these fields. Subsequently, terminal 20 randomly selects a resource from the available resource candidates.

[0027] Furthermore, as shown in Figure 2, the resource pool settings may have a period. For example, the period may be a duration of 10240 milliseconds. Figure 2 shows slot t0 SL From slot t Tmax-1 SL This is an example of how the resource pool is configured. The resource pool within each period may be defined by, for example, a bitmap.

[0028] Furthermore, as shown in Figure 2, the transmission trigger in terminal 20 occurs in slot n, and the priority of this transmission is p TX Let's assume that terminal 20 is connected from slot n-T0 to slot nT proc,0 In the sensing window up to the slot immediately preceding it, for example, if another terminal 20 has priority p RX It is possible to detect that a transmission is being made. T0 is given in advance, T proc,0corresponds to the processing time of terminal 20 determined for each sub-carrier spacing in the specification. When an SCI is detected within the sensing window and the RSRP (Reference Signal Received Power) exceeds the threshold, the resources within the resource selection window corresponding to the SCI are excluded. Also, when an SCI is detected within the sensing window and the RSRP is less than the threshold, the resources within the resource selection window corresponding to the SCI are not excluded. The threshold may be, for example, the threshold Th TX and priority p RX set or defined for each resource within the sensing window based on pTX,pRX and may be.

[0029] Also, as shown in slot t m SL in FIG. 2, for example, for transmission, the resources within the resource selection window that are candidates for resource reservation information corresponding to the resources within the sensing window that were not monitored are excluded.

[0030] The resource selection window from slot n + T1 to slot n + T2, as shown in FIG. 2, identifies the resources occupied by other UEs, and the resources from which such resources are excluded become candidate available resources. T1 is determined by terminal 20 with a value of 0 or more and T proc,1 or less, and T proc,1 corresponds to the maximum processing time of terminal 20 determined for each sub-carrier spacing in the specification. T2 is determined by terminal 20 with a value of T 2min or more and remaining packet delay budget or less when T 2min is less than the remaining packet delay budget, and T2 = T 2min when T 2min is more than or equal to the remaining packet delay budget. T 2min is preset for each priority. Let the set of candidate available resources be S 2min 2min A AIf the resource selection window is less than 20%, the threshold Th is set for each resource in the sensing window. pTX,pRX You can increase the threshold Th by 3dB and perform resource identification again. pTX,pRX By increasing the value and performing resource identification again, the number of resources that are not excluded because the RSRP is below the threshold is increased, resulting in a set of resource candidates S. A It may also be necessary to ensure that it occupies 20% or more of the resource selection window. A If the resource selection window is less than 20%, the threshold Th is set for each resource in the sensing window. pTX,pRX The process of increasing the value by 3dB and re-identifying the resource may be repeated.

[0031] The lower layer of terminal 20 is S A This may be reported to the upper layer. The upper layer of terminal 20 is S A A random selection may be performed to determine which resource to use. Terminal 20 may then use the determined resource to perform a sidelink transmission.

[0032] Although Figure 2 above illustrates the operation of the transmitting terminal 20, the receiving terminal 20 may detect data transmission from another terminal 20 based on the results of sensing or partial sensing and receive data from that other terminal 20.

[0033] Figure 3 is a flowchart showing an example of preemption in NR. Figure 4 is a diagram showing an example of preemption in NR. In step S101, terminal 20 performs sensing in the sensing window. If terminal 20 is performing power-saving operation, sensing may be performed for a predetermined limited period. Subsequently, terminal 20 identifies each resource in the resource selection window based on the sensing results and selects a set of resource candidates S A The terminal 20 then determines the set of resource candidates S and selects the resource to be used for transmission (S102). ASelect a resource set (r_0, r_1, ...) from which to determine preemption (S103). This resource set may be notified to the PHY layer from the upper layer as a resource to determine whether or not preemption has occurred.

[0034] In step S104, terminal 20, at timings T(r_0)-T3 shown in Figure 4, re-identifies each resource in the resource selection window based on the sensing results and selects a set of resource candidates S. A The system determines this and then determines preemption for the resource set (r_0, r_1, ...) based on priority. For example, in Figure 4, r_1 is detected by resensing as an SCI transmitted from another terminal 20, and S A It is not included in S. If preemption is enabled, terminal 20 determines that resource r_1 has been preempted if the value prio_RX, which indicates the priority of an SCI sent from another terminal 20, is lower than the value prio_TX, which indicates the priority of a transport block sent from its own terminal. Note that a lower value indicates a higher priority. In other words, if the value prio_RX, which indicates the priority of an SCI sent from another terminal 20, is higher than the value prio_TX, which indicates the priority of a transport block sent from its own terminal, terminal 20 determines that resource r_1 has been preempted. A It is not excluded. Alternatively, if preemption is only effective for a specific priority (for example, if sl-PreemptionEnable is one of pl1, pl2, ..., pl8), this priority is set to prio_pre. In this case, if the value prio_RX, which indicates the priority of the SCI sent from another terminal 20, is lower than prio_pre, and prio_RX is lower than the value prio_TX, which indicates the priority of the transport block sent from the terminal itself, terminal 20 determines that resource r_1 has been preempted.

[0035] In step S105, if preemption is determined in step S104, terminal 20 notifies the upper layer of the preemption, the upper layer re-selects the resource, and the preemption check is terminated.

[0036] If re-evaluation is performed instead of preemption checking, in step S104 above, the set of resource candidates S A After deciding, S A If the resource set (r_0, r_1, ...) does not contain any resources, those resources will not be used, and a re-selection of resources will be performed in the higher layer.

[0037] Inter-terminal coordination has been specified as a method to improve reliability and latency performance. For example, inter-terminal coordination method 1 and inter-terminal coordination method 2, shown below, have been specified. Hereinafter, terminal 20 that transmits coordination information will be referred to as UE-A, and terminal 20 that receives coordination information will be referred to as UE-B.

[0038] Inter-UE coordination method 1) For UE-B to transmit, the preferred resource set and / or non-preferred resource set are sent from UE-A to UE-B. Hereinafter, inter-UE coordination method 1 will also be referred to as IUC scheme 1 (Inter-UE coordination scheme 1).

[0039] Inter-UE coordination method 2) UE-A transmits to UE-B information indicating resources where collisions with other transmissions or receptions are expected and / or where collisions have been detected, based on the SCI received from UE-B. Hereinafter, inter-UE coordination method 2 will also be referred to as IUC scheme 2 (Inter-UE coordination scheme 2).

[0040] 3GPP Release 16 or Release 17 sidelinks are specified for the following: 1) and 2)

[0041] 1) An environment where only 3GPP terminals exist in the ITS (Intelligent Transport Systems) band. 2) An environment that makes UL resources available to SL in the FR1 (Frequency range 1) and FR2 license bands defined in NR.

[0042] As a sidelink for 3GPP Release 18 and later, the inclusion of unlicensed bands is being considered. Examples include unlicensed bands such as the 5GHz-7GHz band and the 60GHz band.

[0043] Figure 5 shows examples of frequency bands used in wireless communication systems. The NR specifications of 3GPP Release 15 and Release 16 consider operating in frequency bands above 52.6 GHz, for example. As shown in Figure 5, the currently defined frequency range (FR) 1 is from 410 MHz to 7.125 GHz, with a Subcarrier Spacing (SCS) of 15, 30, or 60 kHz and a bandwidth of 5 MHz to 100 MHz.

[0044] FR2-1 covers the frequency band from 24.25 GHz to 52.6 GHz, using an SCS of 60, 120, or 240 kHz, with a bandwidth of 50 MHz to 400 MHz. As shown in Figure 5, FR2-2 may be envisioned to cover the range from 52.6 GHz to 71 GHz. Furthermore, support for frequency bands exceeding 71 GHz may also be envisioned.

[0045] When using bandwidths exceeding 52.6 GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) with a larger Sub-Carrier Spacing (SCS) may be applied.

[0046] Furthermore, in high-frequency bands such as FR2-2, increased inter-carrier phase noise becomes a problem. Therefore, the application of a larger (wider) SCS or single-carrier waveform may be necessary.

[0047] For example, unlicensed bands in the 5GHz-7GHz range could include 5.15GHz to 5.35GHz, 5.47GHz to 5.725GHz, and above 5.925GHz.

[0048] For example, unlicensed bands in the 60GHz band could include those from 59GHz to 66GHz, from 57GHz to 64GHz or 66GHz, and from 59.4GHz to 62.9GHz.

[0049] In unlicensed bands, various regulations are in place to prevent interference with other systems or equipment.

[0050] For example, in the 5GHz-7GHz band, Listen Before Talk (LBT) is performed when accessing a channel. The base station 10 or terminal 20 performs a power detection for a predetermined period immediately before transmission, and if the power exceeds a certain value, i.e., if it detects transmission from another device, it stops transmitting (this may be called an LBT failure). In addition, a Maximum Channel Occupancy Time (MCOT) is defined. MCOT is the maximum time interval during which transmission is allowed to continue if transmission is started after LBT, and in Japan, for example, it is 4ms.

[0051] Furthermore, as an Occupied channel bandwidth (OCB) requirement, when transmitting using a carrier bandwidth, it must use at least X% of that bandwidth. For example, in Europe, it is required to use 80% to 100% of the Nominal channel bandwidth (NCB). The OCB requirement aims to ensure that power detection of channel access is performed correctly.

[0052] Furthermore, regarding the maximum transmit power and maximum power spectral density, it is stipulated that transmissions must be performed at or below a specified transmit power to avoid excessive interference. For example, in Europe, the maximum transmit power is 23 dBm in the 5150 MHz-5350 MHz band. Also, in Europe, for example, the maximum power spectral density is 10 dBm / MHz in the 5150 MHz-5350 MHz band.

[0053] For example, in the 60GHz band, LBT is performed when accessing a channel. The base station 10 or terminal 20 performs power detection for a predetermined period immediately before transmission, and if the power exceeds a certain value, i.e., if it detects transmission from another device, it stops transmitting. Furthermore, it is stipulated that transmission must be performed at or below a predetermined transmit power with respect to maximum transmit power and maximum power spectral density. It is also stipulated that the system must have the capability to meet OCB requirements.

[0054] NR specifies four types of channel access procedures based on differences in the temporal behavior of the LBT (the period during which sensing is performed). Note that this sensing operation is different from the side-link sensing described above, and is described as LBT sensing for distinction.

[0055] Type 1) Variable-time LBT sensing is performed before transmission. Also known as Category 4 LBT. Type 2A) Performs 25μs LBT sensing before transmission. Also known as Category 2 LBT. Type 2B) Performs 16μs LBT sensing before transmission. Also known as Category 2 LBT. Type 2C) Transmission begins without LBT. Similar to transmission on licensed bands.

[0056] Figure 6 is a diagram illustrating an example of LBT (1). Figure 6 is an example of a Type 1 channel access procedure. Type 1 is further classified into four classes, which indicate the Channel access priority class (CAPC) based on the difference in LBT sensing length. LBT sensing is performed during the following two periods.

[0057] The first period is the Prioritization Period or defer duration, which is 16 + 9 × m p It has a length of [μs]. p A fixed value is defined for each channel access priority class.

[0058] The second period is a backoff procedure with a length of 9 × N [μs]. The value of N is randomly determined from a certain range (see CWS adjustment procedure in Non-Patent Literature 4). N is the initial value of the backoff counter, and the value of the backoff counter decreases by 1 each time that the power of the signal from another device is not detected during the 9 [μs] period.

[0059] In the above, the 9μs LBT sensing period may also be called the LBT sensing slot period.

[0060] In the example in Figure 6, m p = 3, and the hold period is 43 μs. As shown in Figure 6, the backoff counter is fixed while the channel is busy. Also, as shown in Figure 6, if the transmission from NR-U gNB and wireless LAN node #2 collide and an error is detected, the Contention Window Size (CWS) is expanded from 3 to 13 in NR-U gNB.

[0061] Figure 7 is a diagram illustrating LBT example (2). Figure 7 shows an example of a Type 2A or Type 2B channel access procedure without random backoff. A gap for power detection of 25 μs for Type 2A and 16 μs for Type 2B is set before transmission.

[0062] Figure 8 is a diagram illustrating example (3) of an LBT. Figure 8 shows an example of a Type 2C channel access procedure. As shown in Figure 8, no power detection is performed before transmission, and transmission is performed immediately after a gap of no more than 16 μs. The transmission period may be up to 584 μs.

[0063] As mentioned above, NR-U supports multiple LBT types. In type 1 above, the initial value N of the backoff counter ranges from 0 to CW, and the range of values ​​is determined based on the channel access priority class p. p A random number is set for the interval up to [a certain point]. Table 1 shows the m defined for each channel access priority class p in UL. p , CW p Minimum value CW p,min , CW p Maximum value CW p,max Here is an example.

[0064] [Table 1]

[0065] As shown in Table 1, channel access priority class p determines m p , CW p,min , CW p,max The following is determined. When p is 1, the LBT period calculated from Table 1 is a minimum of 34 μs and a maximum of 88 μs. When p is 2, the LBT period calculated from Table 1 is a minimum of 34 μs and a maximum of 160 μs. When p is 3, the LBT period calculated from Table 1 is a minimum of 43 μs and a maximum of 9286 μs. When p is 4, the LBT period calculated from Table 1 is a minimum of 79 μs and a maximum of 9286 μs. Note that Table 1 is the table used in UL.

[0066] The LBT type and channel access priority class may be determined based on notifications from base station 10, channel type, etc. The 25μs or 16μs gap may be set by the base station 10's scheduling, taking into account TA (Timing Advance) and CP extension.

[0067] Figure 9 illustrates an example of direct communication between terminals. UE-to-UE COT sharing, as shown in Figure 9, is being considered. For example, as shown in Figure 9, UE-X can perform an SL transmission to acquire a COT and then issue a COT sharing notification, allowing UE-Y to continuously apply LBT type 2A / 2B / 2C and perform transmissions at that COT.

[0068] On the other hand, as mentioned above, in the unlicensed band, a maximum COT (Maximum COT, hereinafter also referred to as MCOT) is defined by regulations. For example, in Japan, the maximum COT is 4ms. After the MCOT has elapsed, the communication device must execute LBT type 1. As shown in Figure 9, after the MCOT is completed, the UE-Z may execute LBT type 1 and perform transmission.

[0069] For the above-mentioned COT sharing and MCOT, notifications regarding COT sharing are being considered. Based on the notifications regarding COT sharing, the communication device will understand the start and end timings of the COT and operate according to the MCOT regulations.

[0070] Figure 10 is a diagram illustrating an example (1) of direct terminal-to-terminal communication in an embodiment of the present invention. Figure 11 is a diagram illustrating an example (2) of direct terminal-to-terminal communication in an embodiment of the present invention. Here, as shown in Figure 10, when base station 10 schedules sidelink transmission from the licensed band to the unlicensed band using DCI, base station 10 may not be able to recognize the channel status of the unlicensed band. In other words, the method of COT sharing between UEs in resource allocation mode 1 was unclear.

[0071] For example, assuming that the base station 10 is transmitting within the same COT, allocates time-division multiplexing resources to UE-X and UE-Y, and instructs LBT type 2 for the subsequent transmission of UE-Y, then, as shown in Figure 10, if the result of LBT type 1 for the preceding transmission of UE-X is idle, the subsequent transmission of UE-Y can be performed using LBT type 2.

[0072] On the other hand, as shown in Figure 11, if the LBT type 1 result of the preceding UE-X transmission is busy, the preceding UE-X transmission will not be performed, and it will be necessary to use LBT type 1 for the subsequent UE-Y transmission.

[0073] Therefore, when a UE transmits data using a resource related to resource allocation mode 1, it may also transmit information related to COT sharing using that resource. For example, in Figure 10, UE-X transmits information related to COT sharing.

[0074] Next, the UE may receive information related to the COT sharing. For example, in Figure 10, UE-Y may receive information related to COT sharing transmitted from UE-X and, based on that information, decide whether to apply the LBT method and / or CPE (Cyclic Prefix Extension) for transmission from its own device.

[0075] Furthermore, the reception of information related to COT sharing may be performed as an SL sensing operation. Also, the reception of information related to COT sharing may be performed during DRX (discontinuous reception) inactive time. Furthermore, the reception of information related to COT sharing may be performed only in the L slot immediately preceding the transmission of the device. L may be defined in the specification, given by setting or pre-setting, instructed or notified, determined in association with parameters related to LBT, or determined in association with the backoff counter N in LBT type 1.

[0076] For example, a UE (hereinafter referred to as "UE-Y") that is scheduled to transmit SL in slot n may perform the operations shown in operations 1) to 3) below if conditions 1) and 2) shown below are met.

[0077] Condition 1) If it is detected that another UE has acquired or is likely to acquire COT prior to slot n. Condition 2) If it is detected that the COT will end in the slot immediately preceding or before the UE-Y SL transmission (e.g., slot n), or if it is detected that the UE-Y transmission cannot be included within the COT.

[0078] Furthermore, if condition 3) the execution interval of LBT type 1 for UE-Y's SL transmission is included within the COT, UE-Y may perform the operations shown in operations 1) to 3) below.

[0079] Conditions 1), 2), and / or 3) may be determined based on the information received regarding COT sharing.

[0080] Operation 1) UE-Y applies LBT type 1 to the transmission and, within the COT, may determine LBT idle or LBT busy based on a comparison between a value P based on the signal strength of other SL-UEs (e.g., RSRP) and a value Q based on the signal detection strength in LBT. For example, LBT idle may be detected if QP is less than or equal to a predetermined value, and LBT busy may be detected if QP is greater than or equal to a predetermined value. Note that LBT idle may mean that no signals from other devices are detected during LBT execution, and LBT busy may mean that signals from other devices are detected during LBT execution.

[0081] Action 2) UE-Y may cancel the transmission and send a NACK to base station 10.

[0082] Operation 3) UE-Y may apply LBT type 2A, type 2B, or type 2C to the transmission.

[0083] As described above, by operating in this manner, COT sharing in accordance with regulations can be applied even in resource allocation mode 1.

[0084] Furthermore, the DCI used for SL scheduling may have a common format with the same fields for scheduling for licensed bands or ITS bands and scheduling for unlicensed bands. For example, the DCI does not need to notify information related to LBTs. This operation simplifies UE implementation.

[0085] Furthermore, the DCI used for SL scheduling may have different formats or the same format with additional fields for scheduling for licensed bands or ITS bands and scheduling for unlicensed bands.

[0086] For example, the DCI may be used to notify information related to LBT. For example, the UE may determine and execute an LBT method for the notified LBT information, as described using Figure 10. Alternatively, if an LBT method is not applicable to the notified LBT information, the UE may determine and execute an LBT method based on the conditions, or it may abort the transmission and send a NACK to the base station 10.

[0087] As a result of the above operation, the UE can predetermine the LBT method to be applied, thereby ensuring sufficient processing time at the UE, and can also change to an appropriate operation if the base station 10 encounters an unexpected situation.

[0088] Although the above embodiment uses a conventional SL channel and SL signal configuration, it is not limited to this. For example, this embodiment may also be applied when an interlaced channel is used as a configuration to satisfy the OCB requirements.

[0089] The above-described embodiment may be applied only when certain conditions are met. For example, it may be applied in relation to a predetermined SL channel or SL signal. For example, this embodiment may be applied to any of PSCCH / PSSCH, PSFCH, S-SSB, or SL positioning RS. For example, it may be applied based on a predetermined setting or pre-configuration. For example, this embodiment may be applied when "enabling" this embodiment is given in the resource pool by setting or pre-configuration.

[0090] In addition, to apply LBT type 2A, 2B, or 2C, an additional transmission (additional TX), such as a CP extension, may be performed immediately before transmission P.

[0091] Furthermore, the method in the embodiment of the present invention is not limited to the case of direct communication between terminals as described above, but may be applied to other similar cases.

[0092] The above-described embodiment is not limited to V2X terminals, but may also be applied to terminals that perform D2D communication.

[0093] In the above embodiment, when a base station schedules D2D communication from a licensed band to an unlicensed band, the UE can perform operations related to COT sharing and execute appropriate LBT depending on the communication status of the unlicensed band.

[0094] In other words, base stations can schedule resources for direct terminal-to-terminal communication in unlicensed bands from licensed bands.

[0095] (Device configuration) Next, we will describe an example of the functional configuration of the base station 10 and terminal 20 that perform the processes and operations described above. The base station 10 and terminal 20 include functions to implement the embodiments described above. However, the base station 10 and terminal 20 may each have only some of the functions in the embodiments.

[0096] <Base station 10> Figure 12 shows an example of the functional configuration of a base station 10. As shown in Figure 12, 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 12 is merely an example. The names of the functional categories and functional units can be anything as long as they can perform the operations according to the embodiment of the present invention.

[0097] The transmitting unit 110 includes the function of generating a signal to be transmitted to the terminal 20 and transmitting the signal wirelessly. The receiving unit 120 includes the function of receiving various signals transmitted from the terminal 20 and obtaining information from the received signals, for example, information from a higher layer. The transmitting unit 110 also has the function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL / UL control signals, DL reference signals, etc. to the terminal 20.

[0098] The setting unit 130 stores pre-configured setting information and various setting information to be transmitted to the terminal 20 in a storage device, and reads it from the storage device as needed. The contents of the setting information include, for example, information related to D2D communication settings.

[0099] As described in the embodiment, the control unit 140 performs processing related to the settings for the terminal 20 to perform D2D communication. The control unit 140 also transmits the scheduling of D2D communication and DL communication to the terminal 20 via the transmission unit 110. The control unit 140 also receives information related to the HARQ response of D2D communication and DL communication from the terminal 20 via the reception unit 120. The signal transmission function unit of the control unit 140 may be included in the transmission unit 110, and the signal reception function unit of the control unit 140 may be included in the reception unit 120.

[0100] <Terminal 20> Figure 13 shows an example of the functional configuration of terminal 20. As shown in Figure 13, 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 13 is merely an example. The names of the functional categories and functional units can be anything as long as they can perform the operations according to the embodiment of the present invention.

[0101] The transmitting unit 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiving unit 220 wirelessly receives various signals and acquires signals from higher layers from the received physical layer signals. The receiving unit 220 also has the function of receiving NR-PSS, NR-SSS, NR-PBCH, DL / UL / SL control signals or reference signals transmitted from the base station 10. For example, the transmitting 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 receiving unit 220 receives PSCCH, PSSCH, PSDCH or PSBCH, etc. from other terminals 20.

[0102] The setting unit 230 stores various setting information received from the base station 10 or terminal 20 by the receiving unit 220 in its storage device and reads it from the storage device as needed. The setting unit 230 also stores pre-configured setting information. The content of the setting information is, for example, information related to D2D communication settings.

[0103] As described in the embodiment, the control unit 240 controls D2D communication to establish an RRC connection with other terminals 20. The control unit 240 also performs power-saving operations. The control unit 240 also performs HARQ processing for D2D communication and DL communication. The control unit 240 transmits information related to the HARQ response for D2D communication and DL communication scheduled from the base station 10 to the base station 10. The control unit 240 may also schedule D2D communication with other terminals 20. The control unit 240 may autonomously select resources to be used for D2D communication from a resource selection window based on the sidelink sensing results, or it may perform re-evaluation or preemption. The control unit 240 also performs power-saving processing in the transmission and reception of D2D communication. The control unit 240 also performs processing related to inter-terminal coordination in D2D communication. The control unit 240 also performs LBT processing in D2D communication. The signal transmission function in the control unit 240 may be included in the transmission unit 210, and the signal reception function in the control unit 240 may be included in the reception unit 220.

[0104] (Hardware configuration) The block diagrams (Figures 12 and 13) used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may be realized by combining the above one device or the above multiple devices with software.

[0105] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. As mentioned above, the method of implementation is not particularly limited.

[0106] For example, the base station 10, terminal 20, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 14 is a diagram showing an example of the hardware configuration of the base station 10 and terminal 20 according to one embodiment of the present disclosure. The above-mentioned base station 10 and terminal 20 may be physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0107] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the base station 10 and terminal 20 may include one or more of the devices shown in the figure, or it may be configured without some of the devices.

[0108] Each function in the base station 10 and terminal 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and storage device 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of the reading and writing of data in the storage device 1002 and auxiliary storage device 1003.

[0109] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control devices, arithmetic units, registers, etc. For example, the control unit 140, control unit 240, etc., described above may be implemented by the processor 1001.

[0110] Furthermore, the processor 1001 reads programs (program code), software modules, or data from at least one of the auxiliary storage device 1003 and the communication device 1004 into the storage device 1002, and executes various processes accordingly. The program used is one that causes a computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 140 of the base station 10 shown in Figure 12 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Also, for example, the control unit 240 of the terminal 20 shown in Figure 13 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001. Although the above processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The program may be transmitted from the network via a telecommunications line.

[0111] The storage device 1002 is a computer-readable recording medium and may consist of at least one of the following: ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. The storage device 1002 may also be called a register, cache, main memory, etc. The storage device 1002 can store executable programs (program code), software modules, etc., for implementing a communication method according to one embodiment of this disclosure.

[0112] The auxiliary storage device 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disc, a digital multipurpose disc, a Blu-ray® disc), a smart card, flash memory (e.g., a card, a stick, a key drive), a floppy® disk, a magnetic strip, etc. The above-mentioned storage medium may also be a database, server, or other suitable medium that includes at least one of the storage device 1002 and the auxiliary storage device 1003.

[0113] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may include high-frequency switches, duplexers, filters, frequency synthesizers, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the transmit / receive antenna, amplifier section, transmit / receive section, transmission path interface, etc., may be implemented by the communication device 1004. The transmit / receive section may be implemented with physically or logically separated transmitting and receiving sections.

[0114] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0115] Furthermore, each device, such as the processor 1001 and the storage device 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0116] Furthermore, the base station 10 and terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and some or all of each functional block may be realized by such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0117] Figure 15 shows an example of the configuration of vehicle 2001. As shown in Figure 15, vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, front wheels 2007, rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021-2029, an information service unit 2012, and a communication module 2013. Each aspect / embodiment described in this disclosure may be applied to a communication device mounted on vehicle 2001, for example, to the communication module 2013.

[0118] The drive unit 2002 consists of, for example, an engine, a motor, or a hybrid of an engine and a motor. The steering unit 2003 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel, which is operated by the user.

[0119] The electronic control unit 2010 consists of a microprocessor 2031, memory (ROM, RAM) 2032, and communication ports (IO ports) 2033. Signals from various sensors 2021 to 2029 installed in the vehicle 2001 are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

[0120] Signals from various sensors 2021-2029 include current signals from current sensor 2021 which senses motor current, front and rear wheel rotation speed signals obtained by rotation speed sensor 2022, front and rear wheel air pressure signals obtained by air pressure sensor 2023, vehicle speed signals obtained by vehicle speed sensor 2024, acceleration signals obtained by acceleration sensor 2025, accelerator pedal depression signals obtained by accelerator pedal sensor 2029, brake pedal depression signals obtained by brake pedal sensor 2026, shift lever operation signals obtained by shift lever sensor 2027, and detection signals obtained by object detection sensor 2028 for detecting obstacles, vehicles, pedestrians, etc.

[0121] The Information Services Unit 2012 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, television, and radio, and one or more ECUs that control these devices. The Information Services Unit 2012 uses information acquired from external devices via a communication module 2013, etc., to provide various multimedia information and multimedia services to the occupants of the vehicle 2001. The Information Services Unit 2012 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) and output devices that perform output to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

[0122] The driver assistance system unit 2030 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g., GNSS), map information (e.g., high-definition (HD) maps, autonomous vehicle (AV) maps, etc.), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 2030 also sends and receives various information via the communication module 2013 to realize driver assistance functions or autonomous driving functions.

[0123] The communication module 2013 can communicate with the microprocessor 2031 and components of the vehicle 2001 via its communication port. For example, the communication module 2013 sends and receives data via its communication port 2033 to the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axle 2009, the microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and sensors 2021-29 provided in the vehicle 2001.

[0124] The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 2013 may be located either inside or outside the electronic control unit 2010. The external device may be, for example, a base station or a mobile station.

[0125] The communication module 2013 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 2021-2028 input to the electronic control unit 2010, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 2012. The electronic control unit 2010, the various sensors 2021-2028, the information service unit 2012, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 2013 may include information based on the above input.

[0126] The communication module 2013 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 2012 provided in the vehicle 2001. The information service unit 2012 may also be called an output unit, which outputs information (for example, outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 2013). The communication module 2013 also stores the various information received from the external device in memory 2032, which is available to the microprocessor 2031. Based on the information stored in memory 2032, the microprocessor 2031 may control the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, front wheels 2007, rear wheels 2008, axles 2009, sensors 2021-2029, etc., provided in the vehicle 2001.

[0127] (Summary of the embodiments) As described above, according to an embodiment of the present invention, a terminal is provided which includes: a receiving unit that receives control information for scheduling resources for direct terminal-to-terminal communication in an unlicensed band from a base station in a licensed band and receives information from other terminals regarding the sharing of COT (Channel occupancy time) applied to direct terminal-to-terminal communication; a control unit that determines an LBT (Listen before talk) method to be applied to a transmission using the scheduled resources based on the information regarding the sharing of COT; and a transmitting unit that transmits a signal for direct terminal-to-terminal communication if the LBT is successful.

[0128] With the above configuration, when the base station schedules D2D communication from the licensed band to the unlicensed band, the UE can perform COT sharing operations and execute appropriate LBT depending on the communication status of the unlicensed band. In other words, the base station can schedule resources for direct terminal-to-terminal communication in the unlicensed band from the licensed band.

[0129] The receiving unit may receive the information relating to the sharing of the COT as a sensing operation in direct terminal-to-terminal communication, or it may receive it during the DRX (discontinuous reception) inactivity time of direct terminal-to-terminal communication. With this configuration, when the base station schedules D2D communication from the licensed band to the unlicensed band, the UE can perform operations relating to COT sharing and execute appropriate LBT according to the communication status of the unlicensed band.

[0130] If the control unit detects that the other terminal has acquired the COT and that the COT will end immediately before transmission using the scheduled resources, it may perform a type of LBT that is executed when the gap is longer than a certain period. With this configuration, when the base station schedules D2D communication from the licensed band to the unlicensed band, the UE can perform operations related to COT sharing and execute an appropriate LBT depending on the communication status of the unlicensed band.

[0131] If the control unit detects that the other terminal has acquired the COT and that the COT will end immediately before transmission using the scheduled resources, it may cancel the transmission, and the transmission unit may send a negative response to the base station. With this configuration, when the base station schedules D2D communication from the licensed band to the unlicensed band, the UE can perform operations related to COT sharing and perform appropriate LBT depending on the communication status of the unlicensed band.

[0132] If the control unit detects that the other terminal has acquired the COT and that the COT will end immediately before transmission using the scheduled resources, it may perform a type of LBT that is executed when the gap is less than a certain period. With this configuration, when the base station schedules D2D communication from the licensed band to the unlicensed band, the UE can perform operations related to COT sharing and execute an appropriate LBT depending on the communication status of the unlicensed band.

[0133] Furthermore, according to an embodiment of the present invention, a communication method is provided in which a terminal performs the following steps: a receiving procedure in which it receives control information from a base station in a licensed band for scheduling resources for direct terminal-to-terminal communication in an unlicensed band and information relating to the sharing of COT (Channel occupancy time) applied to direct terminal-to-terminal communication from another terminal; a control procedure in which it determines an LBT (Listen before talk) method to be applied to a transmission using the scheduled resources based on the information relating to the sharing of COT; and a transmission procedure in which, if the LBT is successful, it transmits a signal for direct terminal-to-terminal communication.

[0134] With the above configuration, when the base station schedules D2D communication from the licensed band to the unlicensed band, the UE can perform COT sharing operations and execute appropriate LBT depending on the communication status of the unlicensed band. In other words, the base station can schedule resources for direct terminal-to-terminal communication in the unlicensed band from the licensed band.

[0135] (Supplement to the embodiment) While embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, substitutions, etc. Specific numerical examples have been used to facilitate understanding of the invention, but unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention, and matters described in two or more items may be combined as needed, and matters described in one item may be applied to matters described in another item (as long as they do not contradict each other). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical parts. The operation of multiple functional units may be physically performed by one part, or the operation of one functional unit may be physically performed by multiple parts. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as it does not contradict each other. For the convenience of explaining the processing, the base station 10 and terminal 20 have been described using functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to an embodiment of the present invention and the software operated by the processor of the terminal 20 according to an embodiment of the present invention may be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0136] Furthermore, the notification of information is not limited to the embodiments / models described herein and may be carried out by other methods. For example, the notification of information may be carried out by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or combinations thereof. Also, RRC signaling may be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0137] Each aspect / embodiment described in this disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (where x is, for example, an integer or decimal)), FRA (Future Radio Access), NR (new Radio), New radio access (NX), Future generation radio access (FX), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), and IEEE This may apply to at least one system utilizing 802.20, UWB (Ultra-WideBand), Bluetooth®, or other appropriate systems, and to next-generation systems extended, modified, created, or defined based thereon. It may also apply to a combination of multiple systems (for example, a combination of at least one of LTE and LTE-A with 5G).

[0138] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described herein may be reordered, provided they are consistent with each other. For example, the methods described herein present various step elements in an exemplary order and are not limited to that specific order.

[0139] In this specification, specific operations performed by the base station 10 may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station 10, it is clear that various operations performed for communication with the terminal 20 can be performed by the base station 10 and at least one of the other network nodes (for example, an MME or S-GW, but not limited to these). Although the above example illustrates the case where there is one other network node besides the base station 10, the other network node may be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0140] The information or signals described in this disclosure may be output from a higher layer (or lower layer) to a lower layer (or higher layer). They may also be input and output via multiple network nodes.

[0141] Input and output information may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0142] The determination in this disclosure may be made by a value represented by one bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0143] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0144] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0145] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0146] In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and symbol may be a signal (signaling). Also, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, cell, frequency carrier, etc.

[0147] The terms “system” and “network” as used in this disclosure are interchangeable.

[0148] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a given value, or other corresponding information. For example, wireless resources may be indicated by an index.

[0149] The names used for the parameters described above are not restrictive in any way. Furthermore, the formulas and other expressions using these parameters may differ from those expressly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0150] In this disclosure, terms such as "Base Station (BS)", "wireless base station", "base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0151] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a Remote Radio Head (RRH)). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0152] In this disclosure, the transmission of information by a base station to a terminal may be interpreted as the base station instructing the terminal to perform information-based control or operation.

[0153] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0154] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or several other appropriate terms.

[0155] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body refers to a movable object, and its speed of movement is arbitrary. This also includes the case when the mobile body is stationary. The mobile body includes, but is not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones (registered trademark), multicopters, quadcopters, balloons, and items mounted on them. The mobile body may also be a mobile body that moves autonomously based on operation commands. It 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). Furthermore, at least one of the base station and the mobile station may 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.

[0156] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple terminals 20 (which may be called, for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, the terminals 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc., may be interpreted as side channel.

[0157] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station may be configured to have the same functions as the user terminal described above.

[0158] As used in this disclosure, the terms “determining” and “determining” may encompass a wide variety of actions. “Determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in a table, database, or other data structure), and ascertaining. “Determining” may also include, for example, receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and accessing (e.g., accessing data in memory). Furthermore, "judgment" and "decision" can include considering something as having been "judged" or "decided" after resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" and "decision" can include considering something as having been "judged" or "decided" after some action. Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0159] The terms “connected,” “coupled,” or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be reinterpreted as “access.” As used in this disclosure, two elements may be considered to be “connected” or “coupled” with each other using at least one of one or more wires, cables, and printed electrical connections, and, in some non-limiting and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

[0160] The reference signal can also be abbreviated as RS (Reference Signal), and may be called a pilot depending on the applicable standard.

[0161] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0162] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, references to the first and second elements do not imply that only two elements may be employed, or that the first element must precede the second element in any way.

[0163] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0164] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0165] A wireless frame may consist of one or more frames in the time domain. Each of these frames in the time domain may be called a subframe. A subframe may further consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0166] Numerical logic may be communication parameters applied to at least one of the transmission and reception of a signal or channel. Numerical logic may include, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, and specific windowing processes performed by the transceiver in the time domain.

[0167] A slot may consist of one or more symbols in the time domain (such as OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). A slot may also be a time unit based on neurology.

[0168] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. Minislots may also be called subslots. Minislots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0169] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Different names may be used for each of these terms.

[0170] For example, one subframe may be called a Transmission Time Interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one mini-slot may be called a TTI. In other words, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0171] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each terminal 20 to allocate wireless resources (such as the frequency bandwidth and transmission power available to each terminal 20) in TTI units. However, the definition of TTI is not limited to this.

[0172] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0173] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0174] A TTI with a time length of 1ms may also be called a normal TTI, long TTI, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may also be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, mini slot, sub slot, slot, etc.

[0175] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0176] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0177] Furthermore, the time domain of the RB may contain one or more symbols and may be the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0178] One or more RBs may also be called a Physical RB (PRB), Sub-Carrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0179] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0180] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a particular neurology system in a given carrier. These common RBs may be identified by an index of the RBs relative to a common reference point of the carrier. A Bandwidth Part (PRB) may be defined and numbered within a given BWP.

[0181] A BWP may include a BWP for UL (Ultraviolet Link) and a BWP for DL ​​(Download Link). One or more BWPs may be set for a terminal 20 within a single carrier.

[0182] At least one of the configured BWPs may be active, and terminal 20 does not need to be expected to send or receive a predetermined signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0183] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0184] In this disclosure, if articles are added through translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0185] In this disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "combine" may be interpreted similarly to "different."

[0186] Each aspect / embodiment described herein may be used individually, in combination, or switched between as needed during implementation. Furthermore, notification of specific information (e.g., notification that "X is") is not limited to explicit notification, but may also be implicit (e.g., by not providing such notification).

[0187] Although the present disclosure has been described in detail above, it will be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in modified and altered forms without departing from the intent and scope of the present disclosure as defined by the claims. Therefore, the descriptions in the present disclosure are illustrative and not intended to be restrictive in any way. [Explanation of symbols]

[0188] 10 base station 110 Transmitter 120 Receiver 130 Setting section 140 Control Unit 20 devices 210 Transmitter 220 Receiver 230 Setting section 240 Control Unit 1001 Processor 1002 Storage device 1003 Auxiliary storage device 1004 Communication device 1005 Input device 1006 Output device 2001 Vehicle 2002 Drive Unit 2003 Steering Department 2004 Accelerator pedal 2005 Brake pedal 2006 Shift Lever 2007 Front Wheel 2008 Rear wheel 2009 Axle 2010 Electronic Control Unit 2012 Information Services Department 2013 Communication Module 2021 Current Sensor 2022 Rotation speed sensor 2023 Pneumatic Sensor 2024 Vehicle Speed ​​Sensor 2025 Accelerometer 2026 Brake Pedal Sensor 2027 Shift lever sensor 2028 Object Detection Sensor 2029 Accelerator pedal sensor 2030 Driver Support Systems Department 2031 Microprocessor 2032 memory (ROM, RAM) 2033 Communication port (I / O port)

Claims

1. A receiving unit that receives control information from a base station that does not include a specific instruction field related to LBT (Listen before talk) for scheduling resources for direct terminal-to-terminal communication in a frequency band to which LBT is applied, and receives information from other terminals related to the sharing of COT (Channel occupancy time) applied to the direct terminal-to-terminal communication, A control unit that determines an LBT method to be applied to a transmission using the scheduled resource based on the information relating to the sharing of the COT, A terminal having a transmitting unit that transmits a signal for direct communication between terminals if the LBT is successful.

2. The receiving unit receives the information related to the sharing based on the direct communication between terminals and detects the acquisition of the COT by another terminal. The terminal according to claim 1.

3. The control unit determines, based on whether the scheduled resource is included within the range of the remaining COT time identified based on the information relating to the sharing, either a first LBT method having a first sensing period or a second LBT method having a second sensing period shorter than the first sensing period, as the LBT method. The terminal according to claim 1.

4. If the control unit detects that the scheduled resource is not within the remaining time range of the COT, it cancels the transmission. The transmitting unit transmits a negative response to the base station. The terminal according to claim 1.

5. A receiving procedure for receiving control information from a base station that does not include a specific instruction field related to LBT (Listen before talk) for scheduling resources for direct terminal-to-terminal communication in a frequency band to which LBT is applied, and receiving information from another terminal related to the sharing of COT (Channel occupancy time) applied to the direct terminal-to-terminal communication, A control procedure for determining an LBT method to be applied to a transmission using the scheduled resources, based on information relating to the sharing of the COT, A communication method in which a terminal performs a transmission procedure to transmit a signal for direct communication between terminals if the LBT is successful.

6. A wireless communication system having a base station and a terminal, The base station transmits control information that does not include specific instruction fields related to LBT (Listen before talk) for scheduling resources for direct terminal-to-terminal communication in the frequency band to which LBT is applied. The aforementioned terminal is A receiving unit that receives the aforementioned control information from the base station and receives information from other terminals regarding the sharing of COT (Channel occupancy time) applied to direct communication between terminals, A control unit that determines an LBT method to be applied to a transmission using the scheduled resources based on the information relating to the sharing, If the LBT is successful, the transmitting unit transmits a signal for direct communication between terminals, A wireless communication system having the following features.

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