Base station device, user terminal device, control method, program, and communication system

Abstract

To provide a mechanism to reduce the conflict of wireless resources that may occur between sidelink communication in V2X and wireless communication other than V2X.SOLUTION: A base station device includes communication means for performing wireless communication other than V2X (Vehicle to Everything) communication with a first user terminal device, first determination means for determining whether a collision occurs between a first wireless resource used in the wireless communication of the communication means and a second wireless resource used in V2X communication performed by a second user terminal device different from the first user terminal device, and control means for controlling the wireless communication of the communication means on the basis of a determination result by the first determination means.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a base station apparatus, a user terminal apparatus, a control method, a program, and a communication system. [Background technology]

[0002] V2X (Vehicle to Everything) is a vehicle communication technology that can realize network connections and mutual cooperation between vehicles, vehicles and roadside equipment, and vehicles and pedestrians. V2X is expected to be used to support safe driving by warning drivers of hidden dangers that cannot be detected by conventional in-vehicle devices such as cameras and LiDAR (Light Detection And Ranging).

[0003] A transmitter in V2X can directly communicate with a receiver via a sidelink. Unlike the Uu link (air interface between a network device and a user device) of a cellular network, the sidelink communicates via a newly defined PC5 interface (air interface between V2X devices) for V2X. The frequency band used for this communication is specified as Band 47 (5855 MHz to 5925 MHz) in the specifications of 3GPP (3rd Generation Partnership Project) (registered trademark).

[0004] Since V2X is expected to be used for safety-related purposes, high reliability is required in wireless communication, and a method for reducing collisions of wireless resources induced by wireless communication performed by other communication terminals is required. Patent Document 1 discloses the following technology. A terminal performing sidelink communication estimates or predicts interference of PSSCH based on PSCCH received from other terminals performing sidelink communication. PSCCH is an abbreviation for Physical Sidelink Control Channel, and PSSCH is an abbreviation for Physical Sidelink Share Channel. Then, the PSSCH is processed based on the estimated interference. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2019-050559 A Summary of the Invention [Problem to be solved by the invention]

[0006] The wireless communication method described in Patent Document 1 involves multiple terminals performing sidelink communication receiving a PSCCH, and scheduling wireless resources for the PSSCH based on the reception result so as to reduce interference with other PSSCHs.

[0007] However, the wireless communication method as described in Patent Document 1 cannot reduce the collision of wireless resources with base station devices and terminal devices that perform wireless communication other than V2X. As an example of wireless communication other than V2X, NR-U (NR Unlicensed Spectrum) is assumed. NR-U is a technology that operates a communication system based on the 3GPP specifications in an unlicensed band that does not require a license from the authorities of each country. In NR-U, the frequency bands used for communication are the 5 GHz band and the 6 GHz band. In the 3GPP specifications, the 5 GHz band is defined as Band 46 (5150 MHz to 5925 MHz), and the 6 GHz band is defined as Band 102 (5925 MHz to 6425 MHz) and Band 104 (6425 MHz to 7125 MHz). Of these frequency bands, the 5 GHz band in particular overlaps with the frequency band used for sidelink communication in V2X, and therefore there is a concern about the collision of wireless resources. In addition, in order to coexist with other communication systems, NR-U performs carrier sensing before transmission to check that other wireless devices are not using the same frequency. However, because it does not have a means to identify the wireless resources used by V2X terminal devices, there is a problem that wireless resource collisions may occur depending on the timing of carrier sensing.

[0008] The present invention has been made in consideration of at least one of the above problems. As one aspect of the present invention, there is provided a mechanism for reducing a collision of radio resources that may occur between sidelink communication in V2X and wireless communication other than V2X. [Means for solving the problem]

[0009] A base station device according to one aspect of the present invention includes a communication means for performing wireless communication other than V2X (Vehicle to Everything) communication with a first user terminal device; A first determination means for determining whether or not a collision occurs between a first radio resource used in wireless communication of the communication means and a second radio resource used in V2X communication performed by a second user terminal device different from the first user terminal device; The present invention is characterized by comprising a control means for controlling wireless communication of the communication means based on a result of the determination by the first determination means. Effect of the Invention

[0010] According to one aspect of the present invention, it is possible to provide a mechanism for reducing the collision of radio resources that may occur between sidelink communication in V2X and wireless communication other than V2X. [Brief description of the drawings]

[0011] [Figure 1] FIG. 2 is a block diagram illustrating a base station device. [Diagram 2] FIG. 2 is a software functional block diagram of a base station device according to the first embodiment. [Diagram 3] FIG. 2 is a block diagram illustrating a configuration of a terminal device. [Figure 4] FIG. 2 is a software functional block diagram of a terminal device according to the first embodiment. [Diagram 5] 1 is a configuration diagram of a wireless communication system according to a first embodiment. [Figure 6] 1 is an example of an SCI data structure. [Figure 7] FIG. 4 is an operational flow diagram of a base station device in the first embodiment. [Figure 8A] FIG. 11 is a software functional block diagram of a base station device according to a second embodiment. [Figure 8B] FIG. 11 is a software functional block diagram of a terminal device according to a second embodiment. [Figure 9A] FIG. 11 is an operational flow diagram of a terminal device according to the second embodiment. [Figure 9B] FIG. 11 is an operational flow diagram of a base station device in the second embodiment. [Figure 10] FIG. 13 is a software functional block diagram of a base station device according to a third embodiment. [Figure 11] FIG. 11 is a configuration diagram of a wireless communication system according to a third embodiment. [Figure 12]1 is an example of an SCI data structure. [Figure 13] 1 is an example of an SCI data structure. [Figure 14] FIG. 11 is an operational flow diagram of a base station device in the third embodiment. [Figure 15] FIG. 13 is an operational flow diagram according to a modified example of the base station device in the third embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Each embodiment will be described in detail below with reference to the accompanying drawings.

[0013] [First embodiment] FIG. 1 is a diagram illustrating an example of a functional configuration of a base station device 100 according to this embodiment.

[0014] The base station device 100 includes a control unit 101 , a storage unit 102 , a radio receiving unit 103 , and a radio transmitting unit 104 .

[0015] The control unit 101 controls the entire base station device 100 by executing a control program stored in the storage unit 102. The control unit 101 is configured with one or more processors such as a CPU or an MPU, and controls the entire device by executing a control program read into the RAM, which is the storage unit 102. Each process performed by the control unit 101, which will be described in the flowcharts below, can also be realized using a hardware circuit such as an ASIC or an FPGA. ASIC is an abbreviation for Application Specific Integrated Circuit. FPGA is an abbreviation for Field Programmable Gate Array. Furthermore, the hardware circuit and a processor such as a CPU or an MPU can cooperate to realize the process described in the flowcharts below.

[0016] The storage unit 102 stores a control program executed by the control unit 101 and various information such as communication parameters. The control unit 101 executes the control program stored in the storage unit 102 to perform various operations described below. The storage unit 102 may include a main storage unit and an auxiliary storage unit. The main storage unit is, for example, a ROM (Read Only Memory) or a RAM (Random Access Memory). The main storage unit may store or temporarily store programs and data such as an OS (Operating System) that is basic software executed by the control unit 101 and application software. The auxiliary storage unit is, for example, a HDD (Hard Disk Drive) or an SSD (Solid State Drive), and may store data related to application software. For example, the control program stored in the non-volatile storage area is expanded in a RAM (Random Access Memory) and executed by a processor constituting the control unit 101. In this manner, the control unit 101 and the storage unit 102 may function as a so-called computer.

[0017] The wireless receiving unit 103 receives a signal conforming to the 3GPP standard. Note that although 5G will be described here, the present invention is also applicable to other standards (for example, 5G Advanced and 6G).

[0018] The radio transmitting unit 104 transmits a signal conforming to the 3GPP standard.

[0019] FIG. 2 is a block diagram illustrating an example of a configuration of software functional blocks of base station device 100. As shown in FIG.

[0020] The software function block 201 of the base station device 100 includes a signal transmission unit 202, a signal reception unit 203, a data storage unit 204, a communication resource scheduling unit 205, and a V2X terminal device radio resource specifying unit 206. The software function block 201 also includes a V2X terminal device communication priority acquisition unit 207, a radio resource collision determination unit 208, and a radio resource usage status acquisition unit 209. The software function block 201 also includes a collision avoidance processing unit 210.

[0021] Here, the radio resource refers to a predetermined region represented in the frequency domain and the time domain. For example, in 5G, the frequency domain and the time domain are represented by subcarriers and symbols. The symbols are also called OFDM symbols. An area represented by one subcarrier and one symbol is called a resource element. Furthermore, 12 consecutive subcarriers in the frequency domain are called a resource block. Furthermore, 14 consecutive symbols in the time domain are called a slot.

[0022] A collision of wireless resources means that a part or all of the wireless resources used for communication by two different devices overlap. For example, in this embodiment, a collision of wireless resources is expressed as a part or all of the wireless resources used by the base station device 100 for communication overlapping with a part or all of the wireless resources used by the V2X terminal device.

[0023] The signal transmission unit 202 transmits signals conforming to the 3GPP standard.

[0024] The signal receiving unit 203 receives signals conforming to the 3GPP standard.

[0025] The data storage unit 204 stores and holds the software itself and information such as authentication information.

[0026] The communication resource scheduling unit 205 performs resource scheduling for wireless communication different from V2X communication.

[0027] The V2X terminal device radio resource specifying unit 206 specifies radio resources used in communication by the V2X terminal device 700, which will be described later. In this embodiment, the V2X terminal device radio resource specifying unit 206 specifies radio resources used in communication by the V2X terminal device 700, based on the SCI received by the signal receiving unit 203 through the PSCCH. SCI is an abbreviation for Sidelink Control Information. A method of specifying radio resources will be described in further detail later.

[0028] The V2X terminal device communication priority acquisition unit 207 acquires the priority of data that is scheduled to be transmitted by the V2X terminal device 700 described later. In this embodiment, the V2X terminal device communication priority acquisition unit 207 acquires the priority based on the SCI received through the PSCCH by the signal receiving unit 203. Further details of the method of acquiring the priority will be described later.

[0029] The radio resource collision determination unit 208 determines whether the radio resource used in the communication of the own station and the radio resource identified by the V2X terminal device radio resource identification unit 206 will collide.

[0030] The radio resource usage status acquisition unit 209 acquires the usage status of radio resources in the sidelink communication frequency band.

[0031] The collision avoidance processing unit 210 controls communication between the base station device 100 and the terminal device 200 based on the determination result by the wireless resource collision determination unit 208. Specifically, when it is determined that wireless resources collide, the collision is restricted or prohibited from wireless communication between the base station device 100 and the terminal device 200 so as to avoid the collision. For example, the collision avoidance processing unit 210 may control not to use wireless resources used by the V2X terminal device 700 in wireless communication between the base station device 100 and the terminal device 200, or may stop (prohibit) wireless communication itself between the base station device 100 and the terminal device 200. Details of the collision avoidance processing performed by the collision avoidance processing unit 210 will be described later.

[0032] FIG. 3 is a diagram illustrating an example of a functional configuration of the terminal device 200 according to this embodiment.

[0033] The terminal device 200 includes a control unit 301 , a storage unit 302 , a wireless receiving unit 303 , a wireless transmitting unit 304 , an output unit 305 , and an input unit 306 .

[0034] The control unit 301 controls the entire terminal device 200 by executing a control program stored in the storage unit 302. The control unit 301 is configured with one or more processors such as a CPU or MPU, and controls the entire device by executing a control program read into the RAM that is the storage unit 302. Note that each process performed by the control unit 301, which will be described in the flowcharts below, can also be realized using a hardware circuit such as an ASIC or FPGA. Furthermore, the processes described in the flowcharts below can also be realized by having the hardware circuit cooperate with a processor such as a CPU or MPU.

[0035] The storage unit 302 stores a control program executed by the control unit 301 and various information such as communication parameters. The various operations described below are performed by the control unit 301 executing the control program stored in the storage unit 302. The storage unit 302 may include a main storage unit and an auxiliary storage unit. The main storage unit is, for example, a ROM or a RAM. The main storage unit may store or temporarily store programs and data such as an OS, which is basic software executed by the control unit 101, and application software. The auxiliary storage unit is, for example, a HDD or an SSD, and may store data related to application software. For example, the control program stored in the non-volatile storage area is expanded in the RAM and executed by a processor constituting the control unit 301. In this manner, the control unit 301 and the storage unit 302 may function as a so-called computer.

[0036] The wireless receiving unit 303 receives a signal conforming to the 3GPP standard.

[0037] The radio transmitting unit 304 transmits a signal conforming to the 3GPP standard.

[0038] The output unit 305 is an output unit that performs various outputs. The output unit 305 may be capable of outputting visually perceptible information such as an LCD (Liquid Crystal Display) or an LED (Light Emitting Diode), or may be capable of outputting sound such as a speaker. The output unit 305 may have a function of outputting at least one of visual information and sound information.

[0039] The input unit 306 allows the user to input various information, etc. The input unit 306 also acquires sensor information.

[0040] FIG. 4 is a block diagram showing an example of a configuration of software functional blocks of terminal device 200. As shown in FIG.

[0041] The software function block 401 of the terminal device 200 includes a signal transmitting unit 402 , a signal receiving unit 403 , a data storage unit 404 , and an input / output control unit 405 .

[0042] The signal transmitting unit 402 transmits signals conforming to the 3GPP standard.

[0043] The signal receiving unit 403 receives signals conforming to the 3GPP standard.

[0044] The data storage unit 404 stores and holds the software itself and information such as authentication information.

[0045] The input / output control unit 405 controls the output unit 305 and the input unit 306 in FIG.

[0046] FIG. 5 is a diagram showing a configuration example of a wireless communication system according to this embodiment. As shown in FIG. 5, the wireless communication system according to this embodiment includes a base station device 100, a terminal device 200, and a V2X terminal device 700. Wireless communication between the base station device 100 and the terminal device 200 becomes an interference source that may induce a collision of wireless resources with respect to wireless communication between the V2X terminal device 700a and the V2X terminal device 700b. Note that the wireless communication between the base station device 100 and the terminal device 200 is performed via an uplink UL or a downlink DL. Also, the wireless communication between the V2X terminal device 700a and the V2X terminal device 700b is performed via a sidelink SL.

[0047] In reality, there may be a large number of base station devices, terminal devices, and V2X terminal devices, but FIG. 5 illustrates only the number necessary for explanation.

[0048] In this embodiment, a case will be described in which 5G communication technology is used as a wireless communication method between the base station device 100 and the terminal device 200 and between the V2X terminal device 700a and the V2X terminal device 700b. The 5G communication technology is, for example, a communication technology called 5G-NR (New Radio) whose specifications are formulated by 3GPP. Here, the base station device 100 and the terminal device 200 perform wireless communication using NR-U (NR Unlicensed Spectrum), which is a function for performing 5G-NR communication in an unlicensed band. In addition, in the vicinity of the base station device 100 and the terminal device 200, the V2X terminal device 700a and the V2X terminal device 700b perform wireless communication using a side link method.

[0049] In this embodiment, the unlicensed 5.9 GHz band is used as the operating frequency band for wireless communication between the base station device 100 and the terminal device 200 via the uplink UL or downlink DL. Also, the unlicensed 5.9 GHz band is used for wireless communication between the V2X terminal device 700a and the V2X terminal device 700b via the sidelink SL.

[0050] Regarding the operational frequency band used in communication between the base station device 100 and the terminal device 200, either the uplink UL or the downlink DL may be a licensed band.

[0051] In this frequency band, the communication between the base station device 100 and the terminal device 200 and the communication between the V2X terminal device 700a and the V2X terminal device 700b are independent communications, and therefore a collision of radio resources may be induced.

[0052] For example, a collision of radio resources may be induced as shown by the dotted line UL' and the solid line SL in Fig. 5. That is, the radio resources used when the V2X terminal device 700a transmits a radio signal to the V2X terminal device 700b via the sidelink SL may collide with the radio resources used when the terminal device 200 transmits a radio signal to the base station device 100 via the uplink UL.

[0053] In the following, the base station device 100 identifies radio resources to be used by the V2X terminal device 700 in communication, and determines whether the identified radio resources collide with radio resources used by the own station. If it is determined that the radio resources collide, a configuration will be described in which the base station device 100 controls so that the identified radio resources are not used in communication between the own station and the terminal device 200.

[0054] In the 5G communication technology, SCI indicating scheduling information in the sidelink scheme is transmitted and received between communication devices that perform wireless communication in the sidelink scheme. The SCI is information transmitted using a physical sidelink control channel (PSCCH) or a physical sidelink shared channel (PSSCH).

[0055] The V2X terminal device 700a can reserve communication resources to be used in the future by transmitting the SCI to the V2X terminal device 700b using the PSCCH or PSSCH. The PSCCH is a channel mainly used for transmitting and receiving control information for performing wireless communication in the sidelink method. The PSSCH is a channel mainly used for transmitting and receiving data to be transmitted. When the PSSCH is used to transmit the SCI, the SCI is added to the data to be transmitted and transmitted.

[0056] In this specification, transmitting and receiving a signal via a PSCCH or a PSSCH is expressed as "transmitting / receiving a PSCCH or a PSSCH."

[0057] In this embodiment, the V2X terminal device 700a transmits the SCI to the V2X terminal device 700b using the PSCCH. The base station device 100 and / or the terminal device 200 are assumed to be able to receive the SCI transmitted by the V2X terminal device 700a via the PSCCH. Fig. 6 is a diagram illustrating an example of SCI on a PSCCH according to an embodiment. Specifically, Fig. 6 illustrates 'SCI format 1-A' used in the first and second modes of V2X communication. Referring to Fig. 6, the SCI in the PSCCH includes first to twelfth fields (F01 to F12) as control information for V2X communication.

[0058] The first field F01 is 'Priority', which indicates the priority of data scheduled to be transmitted via PSSCH. 'Priority' is a 3-bit value, with "000" being "1", followed by "001" being "2", and so on up to "111", representing values ​​from 1 to 8, with the smaller the value, the higher the priority.

[0059] In V2X communication, CAM, a periodic message type, DENM, an event triggered message type, and the like are transmitted via PSSCH. CAM is an abbreviation for Cooperative Awareness Message, and DENM is an abbreviation for Decentralized Environmental Notification Message. CAM includes basic vehicle information such as vehicle dynamic state information such as direction and speed, vehicle static data such as dimensions, external lighting state, and route details. DENM is a message generated in the event of an emergency such as a vehicle breakdown or accident. DENM has a higher priority than CAM. Having a higher priority means that when simultaneous transmission occurs, the message with the higher priority is transmitted first, or that the message with the higher priority among multiple messages is transmitted first in terms of time.

[0060] The second field F02 is 'Frequency resource assignment' and indicates information regarding frequency resource assignment of the PSSCH.

[0061] The third field F03 is 'Time resource assignment' and indicates information regarding time resource assignment of the PSSCH.

[0062] The fourth field F04 is 'Resource reservation period' and indicates the period for transmitting the PSSCH.

[0063] The fifth field F05 is 'DMRS pattern' and indicates the pattern of the demodulation reference signal of the PSSCH.

[0064] The sixth field F06 is '2nd-stage SCI format' and indicates the format of the 2nd-stage SCI transmitted via the PSSCH.

[0065] The seventh field F07 is a 'Beta_offset indicator', which indicates the amount of resources required for transmission.

[0066] The eighth field F08 is 'Number of DMRS port' and indicates the number of the antenna port used for transmitting the DMRS.

[0067] The ninth field F09 is 'Modulation and coding scheme' and indicates the modulation and coding applied to the PSSCH.

[0068] The tenth field F10 is an 'Additional MCS table indicator' and indicates an additional table for modulation and coding applied to the PSSCH.

[0069] The eleventh field F11 is 'PSFCH overhead indication' and indicates information for determining the TBS (transport block size) of the PSSCH.

[0070] The twelfth field F12 is 'Reserved', which indicates that the item is on hold.

[0071] As described above, in this embodiment, the V2X terminal device communication priority acquisition unit 207 can acquire the priority based on the first field F01 among the first to twelfth fields (F01 to F12) of the SCI received by the PSCCH. In addition, the second to fourth fields (F02 to F04) among the first to twelfth fields (F01 to F12) of the SCI described above define the PSSCH resource configuration. These second to fourth fields (F02 to F04) are resource reservation information. Therefore, in this embodiment, the V2X terminal device radio resource specifying unit 206 can specify the radio resource based on the resource reservation information included in the SCI received by the PSCCH. That is, the V2X terminal device radio resource specifying unit 206 can specify the radio resource of the PSSCH used in the communication between the V2X terminal device 700a and the V2X terminal device 700b.

[0072] 7 is a flowchart for reducing a collision of radio resources occurring between sidelink communication in V2X and wireless communication other than V2X, which is performed in the base station device 100 of the present embodiment. This flowchart may be started in the control unit 101 before the base station device 100 starts communication with the terminal device 200. Alternatively, the control unit 101 may be started when the terminal device 200 connects to the base station device 100.

[0073] This flowchart is performed by the control unit 101 reading and executing a computer program stored in the memory unit 102, and after the operation of the flowchart starts, it is executed continuously while the base station device 100 is operating.

[0074] After starting the process in FIG. 7, base station apparatus 100 performs an operation of receiving SCI via the PSCCH (S100).

[0075] In S101 following S100, the base station apparatus 100 acquires PSSCH resource reservation information and priority information based on the SCI received in S100. The base station apparatus 100 identifies the radio resources to be used by the V2X terminal apparatus 700 based on the acquired resource reservation information.

[0076] In S102, the base station device 100 determines whether the radio resources to be used in communication with the terminal device 200 collide with the radio resources to be used by the V2X terminal device 700 identified in S101.

[0077] If S102 is No, the process ends, and if S102 is Yes, in S103, the base station device 100 determines whether or not to change the radio resources to be used in communication with the terminal device 200. This determination may be based on the priority information acquired in S101. For example, if the acquired priority value is "1" and the threshold value serving as the criterion for determining whether the priority is high or low is "3", the determination in S103 is No.

[0078] If S103 is No, the base station device 100 suspends communication with the terminal device 200 (S106), and if S103 is Yes, in S104, the base station device 100 determines whether or not there is an available wireless resource. That is, in S104 following S103, the base station device 100 determines whether or not there is an available free wireless resource based on the resource reservation information acquired in S101.

[0079] If S104 is No, communication with the terminal device 200 is suspended (S106), and if S104 is Yes, the radio resource to be used is changed to an available free radio resource other than the radio resource used by the V2X terminal device 700.

[0080] As a result, it is possible to reduce the collision of wireless resources that occurs between sidelink communication in V2X and wireless communication other than V2X.

[0081] In the present embodiment, as described above, the above-mentioned effect is achieved by receiving the SCI through the PSCCH. Alternatively, the same function may be achieved by using a portion other than the SCI in the PSCCH (Physical Sidelink Control CHannel) including the SCI.

[0082] [Second embodiment] In the second embodiment, the functional configuration of the base station device, the functional configuration of the terminal device, and the configuration of the wireless communication system may be similar to the configurations shown in FIGS. 1, 3, and 5 in the first embodiment.

[0083] In the first embodiment, the base station device 100 identifies radio resources used by the V2X terminal device 700 in communication, and determines whether the identified radio resources collide with radio resources used by the base station. If it is determined that the radio resources collide, the base station device 100 controls so that the identified radio resources are not used in communication between the base station device 100 and the terminal device 200. In the following, as a second embodiment, the terminal device 200 acquires resource reservation information and priority information of radio resources used by the V2X terminal device 700 in communication. The terminal device 200 notifies the base station device 100 of the acquired resource reservation information and priority information. The base station device 100, which has received this notification, identifies radio resources used by the V2X terminal device 700 in communication, and then determines whether the identified radio resources collide. If it is determined that the radio resources collide, the base station device 100 controls so that the identified radio resources are not used in communication between the base station device 100 and the terminal device 200.

[0084] Fig. 8A is a software function block diagram of a base station device in the second embodiment. The software function block diagram shown in Fig. 8A is different from the diagram (see Fig. 2) according to the first embodiment described above in that the V2X terminal device radio resource specifying unit 206 is replaced with a V2X terminal device radio resource specifying unit 206A. Also, it is different in that the V2X terminal device communication priority acquisition unit 207 is replaced with a V2X terminal device communication priority acquisition unit 207A.

[0085] The V2X terminal device radio resource specifying unit 206A specifies radio resources to be used in communication by the V2X terminal device 700. In this embodiment, the V2X terminal device radio resource specifying unit 206A specifies radio resources to be used in communication by the V2X terminal device 700, based on notification information from the terminal device 200 received by the signal receiving unit 203. Further details of the method of specifying radio resources will be described later.

[0086] The V2X terminal device communication priority acquisition unit 207A acquires the priority of data that the V2X terminal device 700 plans to transmit. In this embodiment, the V2X terminal device communication priority acquisition unit 207A acquires the priority based on notification information from the terminal device 200 received by the signal receiving unit 203. Further details of the method of acquiring the priority will be described later.

[0087] Fig. 8B is a block diagram showing a software function block 401A of a terminal device in the second embodiment. The block diagram shown in Fig. 8B is different from the same figure (see Fig. 4) according to the above-mentioned first embodiment in that it includes a V2X terminal device radio resource specifying unit 406 and a V2X terminal device communication priority acquiring unit 407. In addition, the terminal device in the second embodiment is different from the above-mentioned first embodiment in that it includes a notification information generating unit 408.

[0088] The V2X terminal device radio resource specifying unit 406 specifies radio resources based on the SCI received by the signal receiving unit 403. The method of specifying radio resources may be the same as the method described above with reference to Fig. 7. That is, the V2X terminal device radio resource specifying unit 406 specifies radio resources based on resource reservation information included in the SCI received on the PSCCH.

[0089] The V2X terminal device communication priority acquisition unit 407 acquires the priority based on the first field F01 among the first to twelfth fields (F01 to F12) of the SCI received on the PSCCH.

[0090] The notification information generation unit 408 generates notification information for the V2X terminal device radio resource specifying unit 206A and the V2X terminal device communication priority acquisition unit 207A of the base station device 100 to function. That is, the notification information includes information that enables the V2X terminal device radio resource specifying unit 206A to specify the radio resource used by the V2X terminal device 700 in communication. Also, the notification information includes information that enables the V2X terminal device communication priority acquisition unit 207A to acquire the priority of data that the V2X terminal device 700 plans to transmit. The notification information may include the SCI itself, or may include information derived based on the SCI (for example, information directly indicating the radio resource and / or the priority).

[0091] 9A is a diagram showing a flowchart of a process performed by the terminal device 200 of this embodiment to acquire resource reservation information of radio resources used in communication by the V2X terminal device 700 and priority information, and notify the base station device 100 of the acquired information. This flowchart may be started in the control unit 301 before starting communication with the base station device 100. Alternatively, it may be started in the control unit 301 when the terminal device 200 connects to the base station device 100.

[0092] This flowchart is carried out by the control unit 301 reading and executing a computer program stored in the storage unit 302, and after the operation of the flowchart starts, it is continuously executed while the terminal device 200 is operating.

[0093] After starting the process in FIG. 9A, the terminal device 200 performs an operation of receiving an SCI via a PSCCH (S200).

[0094] In S201 following S200, resource reservation information and priority information of the PSSCH are obtained based on the SCI received in S200.

[0095] In S202, the terminal device 200 determines whether it is time to notify the base station device 100 of the resource reservation information of the radio resource used by the V2X terminal device 700 and the priority information acquired in S201. The basis for this determination may be based on the resource reservation information of the PSSCH acquired in S201. For example, the terminal device 200 identifies the radio resource used by the V2X terminal device 700 for communication based on the resource reservation information of the PSSCH acquired in S201. If the identified radio resource conflicts with the radio resource to be used in the notification to the base station device 100, the determination in S202 is No. The basis for this determination may also be based on the priority information acquired in S201. For example, if the acquired priority value is "1" and the threshold value serving as a criterion for determining whether the priority is high or low is "3", the determination in S202 is No.

[0096] If S202 is No, the process ends without notifying the base station device 100. On the other hand, if S202 is Yes, in S203, the base station device 100 is notified of the information acquired in S201.

[0097] 9B is a diagram showing a flowchart of processing performed by the base station device 100 of this embodiment. In FIG. 9B, the base station device 100 identifies radio resources to be used by the V2X terminal device 700 in communication based on a notification received from the terminal device 200, and then determines whether the identified radio resources collide with radio resources used by the own station. If it is determined that the radio resources collide, the base station device 100 controls so that the identified radio resources are not used in communication between the own station and the terminal device 200.

[0098] 9B, the base station apparatus 100 performs an operation of receiving a notification from the terminal apparatus 200 via a PUCCH or a PUSCH (S300). PUCCH is an abbreviation for Physical Uplink Control Channel, and PUSCH is an abbreviation for Physical Uplink Shared Channel.

[0099] In S301 following S300, PSSCH resource reservation information and priority information are acquired based on the notification received in S300 from the terminal device 200. Based on the acquired resource reservation information, the radio resource to be used by the V2X terminal device 700 is identified.

[0100] In S302, the base station device 100 determines whether the radio resources to be used in communication with the terminal device 200 collide with the radio resources to be used by the V2X terminal device 700 identified in S301.

[0101] If S302 is No, the process ends, and if S302 is Yes, in S303, it is determined whether or not to change the wireless resources to be used in communication with the terminal device 200. This determination may be based on the priority information acquired in S301. For example, if the acquired priority value is "1" and the threshold value that is the criterion for determining whether the priority is high or low is "3", the determination in S303 is No.

[0102] If S303 is No, communication with the terminal device 200 is suspended (S306), and if S303 is Yes, it is determined whether or not there is an available wireless resource (S304).

[0103] In S304 following S303, it is determined whether or not there is a free wireless resource that can be used, based on the resource reservation information acquired in S301.

[0104] If S304 is No, communication with the terminal device 200 is suspended (S306). On the other hand, if S304 is Yes, the radio resource to be used is changed to an available free radio resource other than the radio resource used by the V2X terminal device 700 (S305).

[0105] As a result, it is possible to reduce the collision of wireless resources that occurs between sidelink communication in V2X and wireless communication other than V2X.

[0106] [Third embodiment] In the third embodiment, the functional configuration of the base station device, the functional configuration of the terminal device, and the configuration of the software function blocks of the terminal device may be similar to the configurations shown in Figures 1, 3, and 4, as in the first and second embodiments.

[0107] Fig. 10 is a diagram showing a software function block 201C of a base station device in the third embodiment. The block diagram shown in Fig. 10 differs from the diagram (see Fig. 2) according to the first embodiment described above in that it includes a V2X terminal device communication range acquisition unit 211, a V2X terminal device position information acquisition unit 212, and a positional relationship determination unit 213. In addition, the block diagram shown in Fig. 10 differs from the diagram (see Fig. 2) according to the first embodiment described above in that the collision avoidance processing unit 210 is replaced with a collision avoidance processing unit 210C.

[0108] The V2X terminal device communication range acquisition unit 211 acquires information on the communication range of the V2X terminal device 700. Details of a method for acquiring information on the communication range (communication range) will be described later with reference to FIG.

[0109] The V2X terminal device position information acquisition unit 212 acquires the position information of the V2X terminal device 700. Details of a method for acquiring the position information of the V2X terminal device 700 will be described later with reference to FIG.

[0110] The positional relationship determination unit 213 determines whether or not the positional relationship between the local station and the V2X terminal device 700 satisfies a predetermined condition, based on the communication area and position information acquired by the V2X terminal device communication range acquisition unit 211 and the V2X terminal device position information acquisition unit 212. The predetermined condition is a condition that is satisfied when the positional relationship is not one in which the above-mentioned collision of wireless resources may occur, and will be described in detail later.

[0111] The collision avoidance processing unit 210C has the following functions in addition to or instead of the functions of the collision avoidance processing unit 210 according to the above-mentioned embodiment 1. That is, the collision avoidance processing unit 210C functions when communication with the terminal device 200 is suspended, and determines whether or not communication with the terminal device 200 can be resumed based on the determination result by the positional relationship determination unit 213. Then, the collision avoidance processing unit 210C resumes communication with the terminal device 200 when a predetermined condition is satisfied, and prohibits resumption of communication with the terminal device 200 when the predetermined condition is not satisfied.

[0112] Fig. 11 is a diagram showing a configuration example of a wireless communication system according to this embodiment. As shown in Fig. 11, the wireless communication system according to this embodiment has a base station device 100 and a V2X terminal device 700a. Note that, in reality, a large number of base station devices, terminal devices, and V2X terminal devices may exist, but Fig. 11 shows only the configuration necessary for explaining this embodiment.

[0113] Fig. 12 is a diagram showing an example of SCI on a PSSCH according to this embodiment. Specifically, Fig. 12 shows 'SCI format 2-B' used in the first and second modes of V2X communication. Referring to Fig. 12, the SCI in the PSSCH includes first to eighth fields (F01 to F08) as control information for V2X communication.

[0114] The first field F01 is 'HARQ process number' and indicates information for managing a Hybrid Automatic Repeat Request (HARQ) process.

[0115] The second field F02 is a 'New data indicator' and indicates whether the received TB (Transport Block) is a new transmission or a retransmission.

[0116] The third field F03 is 'Redundancy version' and indicates information related to the rate matching operation.

[0117] The fourth field F04 is 'Source ID' and indicates information for identifying the terminal device that is the source of the message.

[0118] The fifth field F05 is 'Destination ID' and indicates information for identifying the destination terminal device.

[0119] The sixth field F06 is a 'HARQ feedback enabled / disabled indicator' and indicates information for enabling or disabling feedback of a hybrid automatic repeat request.

[0120] The seventh field F07 is 'Zone ID', which indicates the geographical location of the terminal.

[0121] The eighth field F08 is 'Communication range requirement', and indicates information indicating the communication range of the source terminal device.

[0122] The receiving terminal device compares the Zone ID received from the transmitting terminal device with the Zone ID of its own terminal device to calculate the approximate distance from the transmitting terminal device. The receiving terminal device then determines whether or not the receiving terminal device is within the communication area of ​​the transmitting terminal device based on the calculated distance and the communication range requirement information received from the transmitting terminal device. If the receiving terminal device determines that the receiving terminal device is within the communication area of ​​the transmitting terminal device, it executes a retransmission process when it fails to receive the PSSCH. On the other hand, if the receiving terminal device determines that the receiving terminal device is not within the communication area of ​​the transmitting terminal device, it does not execute a retransmission process when it fails to receive the PSSCH.

[0123] Of the first to eighth fields (F01 to F08) of the SCI described above, the seventh and eighth fields (F07 to F08) indicate the geographical position and communication area of ​​the V2X terminal device 700.

[0124] That is, the base station apparatus 100 can acquire location information and communication region information of the V2X terminal apparatus 700 based on the SCI received in the PSSCH. That is, the base station apparatus 100 can acquire location information and communication region information of the V2X terminal apparatus 700 based on the Zone ID and communication range requirement information in the seventh and eighth fields (F07 to F08) included in the SCI.

[0125] In this embodiment, SCI format 2-B' is used to acquire the location information and communication area information of the V2X terminal device 700. However, thirteenth and fourteenth fields (F13 to F14) may be provided in 'SCI format 1-A' as shown in Fig. 13. In this case, the location information and communication area information of the V2X terminal device 700 may be acquired by adding a Zone ID and a Communication range requirement and receiving 'SCI format 1-A' in Fig. 13 via the PSCCH.

[0126] In the following, it will be described how, in the first and second embodiments, when communication between the base station device 100 and the terminal device 200 is suspended, the base station device 100 controls to resume communication.

[0127] 14 is a diagram showing a flowchart of communication resumption processing performed by the base station device 100 of this embodiment. This flowchart may be started in the control unit 101 when the base station device 100 suspends communication with the terminal device 200 to avoid the above-mentioned collision of radio resources. Alternatively, this flowchart may be started in the control unit 101 when the base station device 100 starts an operation of receiving SCI on the PSCCH.

[0128] This flowchart is performed by the control unit 101 reading and executing a computer program stored in the memory unit 102, and after the operation of the flowchart starts, it is executed continuously while the base station device 100 is operating.

[0129] After starting the process in FIG. 14, the base station apparatus 100 checks the reception state of the SCI in the PSCCH and the PSSCH (S400).

[0130] In S401 following S400, it is determined whether a state in which an SCI has not been received continues for a time period equal to or longer than a threshold. If S401 is Yes, it is determined that a predetermined condition is satisfied, and communication is resumed (S407). On the other hand, if S401 is No, location information and communication range information of the V2X terminal device 700 are obtained from the received SCI (S402).

[0131] In S403 following S402, the distance A between the base station device 100 and the V2X terminal device 700 is calculated based on the position information of the V2X terminal device 700 acquired in S402.

[0132] In S404 following S403, a communication radius B centered on the V2X terminal device 700 is calculated based on the information on the communication region of the V2X terminal device 700 acquired in S402.

[0133] In S405 following S404, a value X is calculated by subtracting the communication radius B calculated in S404 from the distance A calculated in S403.

[0134] In S406, base station device 100 determines whether the value of X calculated in S405 is equal to or greater than a threshold. In other words, if the value of X is equal to or greater than the threshold, it can be said that the distance between base station device 100 and V2X terminal device 700 exceeds communication radius B (is sufficiently far away).

[0135] If S406 is Yes, it is determined that the predetermined condition is satisfied, and communication is resumed (S407) and the process ends. On the other hand, if S406 is No, the communication pause state is continued (S408) and the process ends.

[0136] Although X calculated in S405 is used as the basis for the determination in S406, the distance A calculated in S403 may be used as the basis for the determination in S406 without using X.

[0137] As a result, it is possible to resume communication at an appropriate timing even when the base station device 100 stops communication in order to reduce radio resource collisions with the V2X terminal device 700. That is, after the stop, the base station device 100 acquires location information and communication area information of the V2X terminal device 700, and determines whether to resume communication based on the acquired information, thereby making it possible to resume communication.

[0138] In FIG. 14, it is determined whether or not a state in which an SCI is not received continues for a time period equal to or longer than a threshold value. However, as in the modified example shown in FIG. 15, this determination may be omitted. [Other embodiments] The present invention can also be realized by supplying a program that realizes one or more functions of each of the above-mentioned embodiments to a system or device via a network or a storage medium, and having one or more processors in a computer of the system or device read and execute the program. It can also be realized by a circuit (e.g., ASIC or FPGA) that realizes one or more functions.

[0139] That is, a recording medium on which the program code of the software for realizing the above-mentioned functions is recorded may be supplied to a system or device, and a computer in the system or device may read and execute the program code stored in the recording medium. In this case, the program code itself read from the storage medium will realize the functions of the above-mentioned embodiment, and the storage medium on which the program code is stored constitutes an element of this embodiment.

[0140] Examples of storage media for supplying the program code include flexible disks, hard disks, optical disks, magneto-optical disks, CD-ROMs, CD-Rs, magnetic tapes, non-volatile memory cards, ROMs, and DVDs.

[0141] In addition, not only can the above-mentioned functions be realized by the computer executing the program code it has read, but the OS running on the computer can also perform some or all of the actual processing based on the instructions of the program code to realize the above-mentioned functions.

[0142] Furthermore, the program code read from the storage medium may be written to a memory provided on a function expansion board inserted into the computer or a function expansion unit connected to the computer, and a CPU provided on the function expansion board or function expansion unit may perform some or all of the actual processing based on instructions from the program code to realize the above-mentioned functions.

[0143] Although each embodiment has been described above in detail, the present invention is not limited to the specific embodiment, and various modifications and changes are possible within the scope of the claims. In addition, it is also possible to combine all or a plurality of the components of the above-described embodiments.

[0144] In addition, the following supplementary notes are disclosed regarding the above embodiment.

[0145] (Appendix 1) A communication means for performing wireless communication other than V2X (Vehicle to Everything) communication with a first user terminal device; A first determination means for determining whether or not a collision occurs between a first radio resource used in wireless communication of the communication means and a second radio resource used in V2X communication performed by a second user terminal device different from the first user terminal device; A base station device comprising: a control means for controlling wireless communication of the communication means based on a result of the determination by the first determination means. (Appendix 2) The base station device described in Supplementary Note 1, characterized in that when the first determination means determines that the first radio resource and the second radio resource collide, the control means restricts or prohibits use of the first radio resource in the wireless communication. (Appendix 3) The device further includes a receiving means for receiving a control signal for sidelink communication via a PSCCH (Physical Sidelink Control Channel), The base station device according to claim 1 or 2, wherein the first determination means determines whether or not the collision will occur based on SCI (Sidelink Control Information) included in the control signal received by the receiving means. (Appendix 4) The base station device described in Supplementary Note 3, characterized in that the first determination means determines whether or not the collision will occur based on information based on SCI, the information being related to time resources and frequency resources of the second radio resources. (Appendix 5) The second user terminal apparatus further includes a receiving means for receiving notification information related to the SCI included in a control signal of the sidelink communication performed by the second user terminal apparatus from the first user terminal apparatus via a PUCCH (Physical Uplink Control Channel) or a PUSCH (Physical Uplink Shared Channel), The base station device according to any one of claims 1 to 4, characterized in that the first determination means determines whether or not the collision will occur based on the notification information received by the receiving means. (Appendix 6) The base station device described in Supplementary Note 5, characterized in that the first determination means determines whether or not the collision will occur based on information based on the notification information, the information being related to time resources and frequency resources of the second radio resources. (Appendix 7) The base station device according to any one of Supplementary Notes 1 to 6, wherein the communication means communicates using NR Unlicensed Spectrum (NR-U) defined by 3GPP (registered trademark). (Appendix 8) A receiving means for receiving a control signal for side link communication via a PSCCH, a first acquiring means for acquiring information on a priority of data to be transmitted regarding the second user terminal device based on an SCI included in the control signal received by the receiving means; The base station device according to any one of Supplementary Notes 1 to 7, wherein the control means suspends communication with the first user terminal device when the priority is equal to or greater than a threshold. (Appendix 9) The first determination means determines whether there is an available free radio resource based on information based on the SCI, the information being related to a time resource and a frequency resource of the second radio resource; The base station device described in Supplementary Note 8, characterized in that the control means changes the radio resources to be used for communication with the first user terminal device to available free radio resources when the priority is less than a threshold and there are available free radio resources, and suspends communication with the first user terminal device when the priority is less than a threshold but there are no available free radio resources. (Appendix 10) A receiving means for receiving a control signal for side link communication via a PSCCH, The base station device according to any one of Supplementary Notes 1 to 9, characterized in that the control means resumes communication with the first user terminal device when the receiving means receives the control signal after a predetermined time or more has elapsed after suspending communication with the first user terminal device based on a judgment result by the first judgment means. (Appendix 11) A receiving means for receiving a control signal for side link communication via a PSCCH, second acquiring means for acquiring location information and information related to a communication area of ​​the second user terminal device based on the control signal received by the receiving means; and a second determination means for determining whether or not a positional relationship with the second user terminal device satisfies a predetermined condition based on the positional information and information related to a communication area acquired by the second acquisition means, The base station device according to any one of Supplementary Notes 1 to 10, characterized in that, when the receiving means does not receive the control signal for a predetermined time or more after suspending communication with the first user terminal device based on the judgment result by the first judgment means, the control means resumes communication with the first user terminal device based on the judgment result by the second judgment means. (Appendix 12) The base station device described in Supplementary Note 11, wherein the control means resumes communication with the first user terminal device if the specified condition is satisfied based on the judgment result by the second judgment means, and prohibits resumption of communication with the first user terminal device if the specified condition is not satisfied. (Appendix 13) 13. The base station device according to claim 11, wherein the predetermined condition is satisfied when the base station device is located outside a communication range of the second user terminal device. [Explanation of symbols]

[0146] 100 Base station equipment 200 Terminal Equipment 202 Signal transmission unit (an example of a communication means) 203 signal receiving unit (an example of a communication means, a first acquisition means, a receiving means, or a second receiving means) 204 Data storage unit 205 Communication resource scheduling unit 206, 206A V2X terminal device radio resource identification unit 207, 207A V2X terminal device communication priority acquisition unit 208 Wireless resource collision determination unit (an example of a first determination means) 209 Radio resource usage status acquisition unit 210 Collision avoidance processing unit (an example of a control means) 211 V2X terminal device communication range acquisition unit (an example of a second acquisition means) 212 V2X terminal device location information acquisition unit (an example of a second acquisition means) 213 Positional relationship determination unit (an example of a second determination means) 301 Control Unit 302 Storage section 303 Radio receiving unit 304 Radio transmitter 305 Output section 306 Input section 402 Signal transmission unit (an example of a notification means) 403 Signal receiving unit (an example of a second receiving means, an acquiring means) 404 Data Storage Unit 405 Input / Output Control Unit 406 V2X Terminal Equipment Radio Resource Identification Unit 407 V2X terminal device communication priority acquisition unit 408 Notification information generation unit (an example of a notification means) 700 V2X Terminal Equipment

Claims

1. A base station device conforming to the 3GPP (registered trademark) standard, A communication means for performing a first wireless communication with a first user terminal device, Acquisition means for acquiring information about radio resources used in a second wireless communication performed by a second user terminal device different from the first user terminal device, A base station device comprising: a control means for controlling the first wireless communication using information relating to the wireless resource acquired by the acquisition means.

2. The base station device according to claim 1, further comprising a determination means for determining whether a collision occurs between another radio resource used when performing the first wireless communication with the first user terminal device and the radio resource.

3. The base station device according to claim 2, characterized in that the control means restricts or prohibits the use of the other radio resource in the first wireless communication when the determination means determines that the wireless resource and the other radio resource are in conflict.

4. The base station device according to claim 1, characterized in that the acquisition means acquires information relating to the radio resource via PSCCH (Physical Sidelink Control Channel).

5. The base station apparatus according to claim 1, characterized in that the information relating to the radio resources is information based on SCI (Sidelink Control Information) and includes information relating to the time resources and frequency resources of the radio resources.

6. The system further includes receiving means for receiving notification information related to SCI included in the control signal of the sidelink communication, which is the second wireless communication performed by the second user terminal device, from the first user terminal device via PUCCH (Physical Uplink Control Channel) or PUSCH (Physical Uplink Shared Channel), The base station device according to claim 2, characterized in that the determination means determines whether the collision occurs based on the notification information received by the receiving means.

7. The base station device according to claim 6, wherein the determination means determines whether the collision occurs based on information relating to the time resources and frequency resources of the radio resource, which is information based on the notification information.

8. The base station device according to claim 1, characterized in that the communication means communicates using NR-U (NR Unlicensed Spectrum) as defined by 3GPP.

9. The acquisition means acquires information on the priority of the transmission schedule data relating to the second user terminal device based on the SCI, The base station device according to claim 1, characterized in that the control means suspends communication with the first user terminal device when the priority is equal to or greater than a threshold.

10. The base station device according to claim 6, characterized in that the control means resumes communication with the first user terminal device if, after suspending communication with the first user terminal device based on the determination result of the determination means, the receiving means does not receive the control signal for a predetermined period of time or longer.

11. A second acquisition means that acquires location information and information related to the communication area of ​​the second user terminal device based on the control signal received by the receiving means, The system further comprises another determination means that determines whether the positional relationship with the second user terminal device satisfies predetermined conditions based on the positional information and information related to the communication area acquired by the second acquisition means, The base station device according to claim 6, characterized in that the control means suspends communication with the first user terminal device based on the determination result of the determination means, and then, when the receiving means receives the control signal, resumes communication with the first user terminal device based on the determination result of the other determination means.

12. The base station device according to claim 11, wherein the control means, based on the determination result by the other determination means, resumes communication with the first user terminal device if the predetermined conditions are met, and prohibits the resumption of communication with the first user terminal device if the predetermined conditions are not met.

13. The base station device according to claim 11 or 12, wherein the predetermined condition is met when the device itself is located outside the communication range of the second user terminal device.

14. A user terminal device compliant with the 3GPP standard, A receiving means for receiving control signals for sidelink communication, An acquisition means for acquiring information about wireless resources used by other user terminals performing sidelink communication, based on the information contained in the control signal received by the receiving means, A user terminal device comprising a notification means for notifying a base station device of the information acquired by the acquisition means.

15. A communication system including a base station device and a user terminal device that conform to the 3GPP standard, The aforementioned user terminal device is A first receiving means for receiving control signals for sidelink communication, A first acquisition means that acquires information about wireless resources used by other user terminals performing sidelink communication, based on the information contained in the control signal received by the first receiving means, The system includes a notification means for transmitting notification information based on the information acquired by the first acquisition means to the base station device, The base station device is, A communication means that performs wireless communication different from side-link communication with the user terminal device, A second receiving means for receiving the aforementioned notification information, A second acquisition means that, based on the notification information received by the second receiving means, acquires information regarding wireless resources used in sidelink communication performed by another user terminal device different from the user terminal device, A communication system comprising: a control means for controlling the wireless communication of the communication means using the information acquired by the second acquisition means.

16. A control method for controlling communication in accordance with the 3GPP standard, A communication process that performs a first wireless communication with a first user terminal device, An acquisition step of acquiring information from the first user terminal device regarding the radio resources used in a second wireless communication performed by a second user terminal device different from the first user terminal device, A control step which controls the first wireless communication of the communication step using the information acquired in the acquisition step, A control method characterized by having the following features.

17. A computer performs a communication process to perform a first wireless communication with a first user terminal device, An acquisition step of acquiring information from the first user terminal device regarding the radio resources used in a second wireless communication performed by a second user terminal device different from the first user terminal device, A program for causing a control step to control the first wireless communication of the communication step using the information acquired in the acquisition step.

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