Base station, communication terminal, communication method, and program

Abstract

To provide a mechanism that can achieve flexible assignment of side link communication frequency bands.SOLUTION: Provided is a base station in a network system in which the base station performs scheduling of a side link communication resource. The base station comprises designation means that designates a frequency band used for side link communication, and notification means that notifies a terminal of the frequency band.SELECTED DRAWING: Figure 6

Description

[Technical field]

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

[0002] In a sidelink communication method conforming to the 3GPP standard, there is a sidelink communication mode in which communication resource scheduling is performed under the control of a base station (Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Special Publication No. 2022-544311 Summary of the Invention [Problem to be solved by the invention]

[0004] In sidelink communication, in which communication resource scheduling is performed under the control of a base station or parent station, the use of a frequency band such as the 5.9 GHz band is assumed, and flexible allocation of frequency bands for sidelink communication is not possible.

[0005] The present disclosure has been made in consideration of the above problems. One aspect of the present disclosure aims to provide a mechanism for enabling flexible allocation of sidelink communication frequency bands. [Means for solving the problem]

[0006] A base station as one aspect of the present disclosure is a base station in a network system in which the base station schedules sidelink communication resources, and includes a designation means for designating a frequency band to be used for sidelink communication, and a notification means for notifying a terminal of the frequency band. Effect of the Invention

[0007] According to one aspect of the present disclosure, it is possible to provide a mechanism that enables flexible allocation of sidelink communication frequency bands. [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a block diagram illustrating a base station. [Diagram 2] FIG. 2 is a software functional block diagram of a base station. [Diagram 3] FIG. 2 is a block diagram illustrating the configuration of a terminal. [Figure 4] FIG. 2 is a software functional block diagram of the terminal. [Diagram 5] 1 is a configuration diagram of a wireless communication system according to a first embodiment. [Figure 6] FIG. 4 is a sequence diagram of a base station in the first embodiment. [Figure 7] 1 is an example of a data structure of an SCI that does not include sidelink communication frequency band information. [Figure 8] 1 is an example of a data structure of an SCI including sidelink communication frequency band information. [Figure 9] FIG. 2 is a sequence diagram of a terminal in the first embodiment. [Figure 10] FIG. 11 is a configuration diagram of a wireless communication system according to a second embodiment. [Figure 11] FIG. 11 is a sequence diagram of a base station in the second embodiment. [Figure 12] DCI including sidelink communication frequency band information are two example data structures. [Figure 13] 1 is an example of a data structure of DCI including sidelink communication frequency band information. [Figure 14] FIG. 11 is a sequence diagram of a terminal according to the second embodiment. [Figure 15] 13 is an example of a data structure of DCI that does not include sidelink communication frequency band information. [Figure 16] FIG. 13 is a sequence diagram of a base station in the third embodiment. [Figure 17]1 is an example of a data structure of DCI including two pieces of sidelink communication frequency band information. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] First Embodiment Hereinafter, a communication device according to a first embodiment will be described in detail with reference to the drawings. Note that the technical scope of the present invention is determined by the claims, and is not limited to the following individual embodiments.

[0010] 1 is a diagram showing an example of the functional configuration of base station 10. Control unit 101 is a control unit that controls itself by executing a control program stored in storage unit 102. Storage unit 102 stores the control program executed by control unit 101 and various information such as communication parameters. Various operations described below are performed by control unit 101 executing the control program stored in storage unit 102. Wireless receiving unit 103 receives a signal conforming to the 3GPP standard. Wireless transmitting unit 104 transmits a signal conforming to the 3GPP standard.

[0011] 2 is a block diagram showing an example of the configuration of software functional blocks of the base station 10. Reference numeral 201 denotes the entire software functional blocks.

[0012] The signal transmitting unit 202 transmits signals conforming to the 3GPP standard.

[0013] The signal receiving unit 203 receives a signal conforming to the 3GPP standard.

[0014] The data storage unit 204 stores and holds the software itself and information such as authentication information.

[0015] The scheduling unit 205 schedules resources (allocates resources) to be used for sidelink communication.

[0016] The frequency band specifying unit 206 specifies a sidelink communication frequency band (a frequency band used for sidelink communication). The sidelink communication frequency band may be indicated by an operating band defined by 3GPP. The sidelink communication frequency band may be interpreted as an operating band used for sidelink communication. Examples of the operating band include n38 (2570 MHz to 2620 MHz), n47 (5855 MHz to 5925 MHz), and n79 (4400 MHz to 5000 MHz). The frequency band specifying unit 206 may specify a plurality of frequency bands used for sidelink communication. The sidelink communication frequency band may be indicated by a channel number defined by 3GPP.

[0017] The scheduling unit 205 schedules resources to be used for sidelink communication from among resources of the frequency band specified by the frequency band specifying unit 206.

[0018] The frequency band notifying unit 207 notifies the terminal of the sidelink communication frequency band specified by the frequency band specifying unit 206. In addition, the frequency band notifying unit 207 may notify the terminal of multiple frequency bands to be used for sidelink communication specified by the frequency band specifying unit 206.

[0019] The radio wave usage status acquisition unit 208 acquires the radio wave usage status of the sidelink communication frequency band.

[0020] The noise level acquisition unit 209 acquires the noise level of the side link communication frequency band.

[0021] The terminal capability acquisition unit 210 acquires the terminal's capabilities in the sidelink communication frequency band.

[0022] The frequency band designation unit 206 is an example of a designation means, and the frequency band notification unit 207 is an example of a notification means.

[0023] 3 is a diagram showing an example of the functional configuration of terminal 30. Control unit 301 controls itself by executing a control program stored in storage unit 302. Storage unit 302 stores the control program executed by control unit 301 and various information such as communication parameters. Various operations described below are performed by control unit 301 executing the control program stored in storage unit 302. Wireless receiving unit 303 receives a signal conforming to the 3GPP standard. Wireless transmitting unit 304 transmits a signal conforming to the 3GPP standard. That is, terminal 30 functions as UE (User Equipment) capable of transmitting and receiving a signal conforming to the 3GPP standard.

[0024] The output unit 305 performs various outputs and has a function of outputting visually perceptible information such as an LCD or LED, or outputting sound such as a speaker. The output unit 305 has a function of outputting at least one of visual information and sound information. The input unit 306 allows the user to perform various inputs, etc., or acquires sensor information.

[0025] 4 is a block diagram showing an example of a configuration of software function blocks of the terminal 30. Reference numeral 401 denotes the entire software function blocks.

[0026] The signal transmission unit 402 transmits a signal conforming to the 3GPP standard. For example, the signal transmission unit 402 transmits a signal for side link communication in a side link communication frequency band notified by the base station 10.

[0027] The signal receiving unit 403 receives a signal conforming to the 3GPP standard. For example, the signal receiving unit 403 receives a side link communication signal in a side link communication frequency band notified from the base station 10.

[0028] The data storage unit 404 stores and holds the software itself and information such as authentication information.

[0029] The input / output control unit 405 controls the output unit 305 and the input unit 306 .

[0030] The frequency band acquisition unit 406 acquires a side link communication frequency band from the base station 10. The frequency band acquisition unit 406 may acquire a plurality of side link communication frequency bands from the base station 10. In this case, the signal transmission unit 402 and the signal reception unit 403 may perform side link communication in a plurality of side link communication frequency bands.

[0031] The frequency band acquisition unit 406 is an example of an acquisition means. The signal transmission unit 402 and the signal reception unit 403 are an example of a communication means.

[0032] Fig. 5 is a diagram showing a configuration example of a wireless communication system according to the present embodiment. As shown in Fig. 5, the wireless communication system according to the present embodiment includes a base station 10, a terminal 30A, and a terminal 30B. The wireless communication system is an example of a network system.

[0033] In reality, many base stations and terminals may exist, but Fig. 5 shows only the configuration necessary for explaining this embodiment. In the following explanation, when there is no need to distinguish between the terminal 30A and the terminal 30B, they will be referred to as the terminal 30.

[0034] The base station 10 schedules sidelink communication resources in accordance with 3GPP. The base station 10 also notifies the terminal 30A of the sidelink communication frequency band and the radio resources to be used for sidelink communication in the frequency band. The terminal 30A performs sidelink communication with the terminal 30B using the radio resources of the frequency band notified by the base station 10. The base station 10 may perform a similar notification not only to the terminal 30A but also to the terminal 30B. The terminals 30A and 30B may perform sidelink communication with each other using the radio resources of the notified frequency band.

[0035] Fig. 6 is a flowchart showing an example of a processing procedure in which the base station 10 flexibly allocates a sidelink communication frequency band. The base station 10 starts the processing procedure shown in Fig. 6 when allocating radio resources for sidelink communication to the terminal 30A. The control unit 101 of the base station 10 may start the processing procedure shown in Fig. 6 when receiving a sidelink communication request from the terminal 30A. Alternatively, the control unit 101 of the base station 10 may start the processing procedure shown in Fig. 6 when the terminal 30A connects to the base station 10. The processing procedure shown in Fig. 6 is performed by the control unit 101 reading and executing a computer program stored in the storage unit 102.

[0036] First, the base station 10 determines whether or not to allow the terminal 30A to communicate in a default sidelink communication frequency band (S601). The default sidelink communication frequency band may be determined in advance by the 3GPP specifications. Alternatively, the default sidelink communication frequency band may be determined by the base station 10 and set in advance in the terminal 30 by a NAS (Non Access Stratum) message, an RRC (Radio Resource Control) message, or the like.

[0037] The base station 10 may determine whether to allow the terminal 30A to communicate in the default sidelink communication frequency band based on the radio wave usage status in the default sidelink communication frequency band. As an example, it is assumed that the default sidelink communication frequency band is 5915 to 5925 MHz. For example, when the radio wave usage status in the frequency band acquired by the radio wave usage status acquisition unit 208 is less than 50%, the base station 10 may determine to allow the terminal 30A to communicate in the default sidelink communication frequency band (S601-Yes).

[0038] The base station 10 may also determine whether to allow the terminal 30A to communicate in the default sidelink communication frequency band based on a noise level in the default sidelink communication frequency band. As an example, it is assumed that the default sidelink communication frequency band is 5915 to 5925 MHz. For example, it is assumed that the noise level of the communication frequency band acquired by the noise level acquisition unit 209 is better than the noise level of another sidelink communication frequency band, 5905 to 5915 MHz. In this case, the base station 10 may determine to allow the terminal 30A to communicate in the default sidelink communication frequency band (S601-Yes).

[0039] The base station 10 may determine whether to allow the terminal 30A to communicate in the default sidelink communication frequency band based on the sidelink communication frequency band support capability of the terminal 30A. For example, it is assumed that the base station 10 can allocate radio resources for sidelink communication in band n47 and band n263, and the default sidelink communication frequency band is band n47. In this case, if the terminal 30A does not support sidelink communication in n263, the base station 10 may determine to allow the terminal 30A to communicate in the default sidelink communication frequency band (S601-Yes). The terminal capability acquisition unit 210 may determine which frequency band of the sidelink communication frequency bands supported by the terminal 30A is supported based on terminal capability information acquired from the terminal 30A. The terminal capability information may be UE Capability Information.

[0040] If S601 is Yes, the base station 10 performs a scheduling process for the terminal 30A in the default sidelink communication frequency band (S602). Note that the scheduling process refers to allocation of radio resources used for communication.

[0041] Next, the base station 10 transmits SCI (Sidelink Control Information) that does not include a sidelink communication frequency band (S603). The SCI is information transmitted on a PSCCH (Physical Sidelink Control Channel). An example of the data structure of the SCI is shown in FIG.

[0042] If S601 is No, the base station 10 performs a scheduling process for the terminal 30A in a non-default sidelink communication frequency band (S604).

[0043] Next, the base station 10 transmits information on the SCI including the sidelink communication frequency band information to the terminal (S605). That is, the base station 10 notifies the terminal 30A of the sidelink communication frequency by including information indicating the sidelink communication frequency band in the information on the SCI transmitted to the terminal. An example of a data structure for transmitting the information on the SCI is shown in FIG. 8. In the data structure shown in FIG. 7, only the “Freq. resource assignment” field, which is resource assignment information, exists, so that it is not possible to distinguish between the default sidelink communication frequency band and the non-default sidelink communication frequency band. On the other hand, in the data structure shown in FIG. 8, since the “sidelink communication frequency band” field exists, it is possible to distinguish between the default sidelink communication frequency band and the non-default sidelink communication frequency band. In addition, even if there are multiple non-default sidelink communication frequency bands, it is possible to specify a frequency band to which resources for sidelink communication are assigned to the terminal 30.

[0044] In the above-described processing procedure of FIG. 6, the base station 10 can transmit information related to the SCI by including it in DCI (Downlink Control Information). The DCI is information transmitted on a PDCCH (Physical Downlink Control Channel). Also, FIG. 7 and FIG. 8 may be replaced with FIG. 15 and FIG. 13, respectively. That is, the base station 10 may notify the terminal 30A of the sidelink communication frequency by including information indicating the sidelink communication frequency band in the DCI. The DCI may be called DCI format 3.0.

[0045] Fig. 9 is a flowchart showing an example of a processing procedure performed by the terminal 30A when operating according to flexible allocation of a sidelink communication frequency band. The control unit 301 of the terminal 30A may start the processing procedure shown in Fig. 9 when the base station 10 allocates radio resources and the sidelink communication becomes possible. Alternatively, the control unit 301 of the terminal 30A may start the processing procedure shown in Fig. 9 when transmitting a sidelink communication request to the base station 10. Alternatively, the control unit 301 of the terminal 30A may start the processing procedure shown in Fig. 9 when connecting to the base station 10. Moreover, this flowchart is performed by the control unit 301 reading and executing a computer program stored in the storage unit 302.

[0046] The terminal 30A judges whether or not information regarding the SCI has been received from the base station 10 (S901). If the result of S901 is No, the process returns to S901.

[0047] If S901 is Yes, the terminal 30A judges whether or not sidelink communication frequency band information is included in the information about the SCI (S902). An example of a case where sidelink communication frequency band information is included in the information about the SCI is as shown in Fig. 8. On the other hand, an example of a case where sidelink communication frequency band information is not included in the information about the SCI is as shown in Fig. 7.

[0048] If S902 is Yes, the terminal 30A starts sidelink communication using radio resources for sidelink communication specified as information about the SCI in the frequency band specified in the sidelink communication frequency band information in the information about the SCI (S903).

[0049] If S902 is No, the terminal 30A starts sidelink communication in the default sidelink communication frequency band using the radio resources for sidelink communication specified in the SCI (S904).

[0050] Thereafter, the terminal 30A performs sidelink communication with the terminal 30B in the sidelink communication frequency band designated by the base station 10.

[0051] In the above-described processing procedure of FIG. 9, information on the SCI can be included in the DCI as described above. Also, FIG. 7 and FIG. 8 may be replaced with FIG. 15 and FIG. 13, respectively. The DCI may be called DCI format 3.0. Detailed radio resources for sidelink communication may be indicated in the SCI format 1-A field of DCI format 3.0. In this case, the terminal 30A or 30B recognizes the frequency band in which the sidelink communication should be performed based on the sidelink communication frequency band information. Then, the terminal 30A or 30B acquires detailed scheduling information of radio resources in that frequency band from the SCI format 1-A field and identifies the radio resources to be used by itself. Then, the terminal performs sidelink communication between the terminals using the identified radio resources.

[0052] According to the above description, the base station 10 is able to flexibly allocate sidelink communication frequency bands.

[0053] Second Embodiment In the second embodiment, the functional configuration of the base station 10, the software functional block configuration of the base station 10, the functional configuration of the terminal 30, the software functional block configuration of the terminal 30, and the network configuration may be the same as those in Figures 1, 2, 3, and 4, as in the first embodiment.

[0054] Fig. 10 is a diagram showing a configuration example of a wireless communication system according to the second embodiment. As shown in Fig. 10, the wireless communication system according to the second embodiment has a base station 10, a terminal 30A, and a terminal 30B. Note that, although there may be many base stations and terminals in practice, Fig. 10 shows only the configuration necessary for explaining the second embodiment.

[0055] In the following description, it will be explained that the base station 10 performs a notification to the terminals 30A and 30B, and when the terminal 30A receives the above-mentioned notification, it performs sidelink communication with the terminal 30B in an appropriate sidelink communication frequency band.

[0056] FIG. 11 is a flowchart showing an example of a processing procedure performed by the base station 10 according to the second embodiment for enabling sidelink communication in a plurality of sidelink communication frequency bands.

[0057] The base station 10 starts the processing procedure shown in Fig. 11 when allocating radio resources for sidelink communication to the terminal 30A. The control unit 101 of the base station 10 may start the processing procedure shown in Fig. 11 when receiving a sidelink communication request from the terminal 30A. Alternatively, the control unit 101 of the base station 10 may start the processing procedure shown in Fig. 11 when the terminal 30A connects to the base station 10. The processing procedure shown in Fig. 11 is performed by the control unit 101 reading and executing a computer program stored in the storage unit 102.

[0058] The base station 10 determines whether or not to allow the terminal 30A to communicate in a plurality of sidelink communication frequency bands (S1101).

[0059] If S1101 is Yes, the base station 10 performs a scheduling process for the terminal 30A in a plurality of side link communication frequency bands (S1102).

[0060] In S1103, the base station 10 transmits a plurality of DCIs including sidelink communication frequency band information. That is, the frequency band notifying unit 207 of the base station 10 notifies the terminal 30A of the plurality of frequency bands by including, in each of the plurality of DCIs, information indicating a frequency band designated among the plurality of frequency bands.

[0061] An example of the data structure of the DCI is shown in Fig. 12. In the example of Fig. 12, a "first sidelink communication frequency band" is set to DCI#1, and a "second sidelink communication frequency band" is set to DCI#2. Note that DCI#1 and DCI#2 are DCIs transmitted to the terminal 30A. Therefore, DCI#1 and DCI#2 have a common (identical) CRC (Cyclic redundancy check) scrambled using the RNTI assigned to the terminal 30A. RNTI is an abbreviation for Radio Network Temporary Identifier.

[0062] Note that DCI#1 and DCI#2 in Fig. 12 may be assigned to different resource blocks of a physical control channel (PDCCH) used for base station 10 to transmit DCI to terminal 30. Also, Fig. 12 shows an example of a case where two DCIs including sidelink communication frequency band information are transmitted, but a similar format is also used when there are three or more DCIs.

[0063] If S1101 is No, the base station 10 performs a scheduling process of radio resources for sidelink communication in a single sidelink communication frequency band (S1104).

[0064] In S1105, the base station 10 transmits DCI including sidelink communication frequency band information. An example of the data structure of the DCI is shown in FIG.

[0065] In the above-described process, the base station 10 may include information indicating a plurality of sidelink communication frequency bands in one DCI, thereby notifying the terminal 30A of a plurality of sidelink communication frequency bands. For example, the base station 10 may include a "first sidelink communication frequency band" and a "second sidelink communication frequency band" in one DCI. That is, in S1103, the base station 10 may transmit a DCI including both the "first sidelink communication frequency band" and the "second sidelink communication frequency band" to the terminal 30A. An example of the format of the DCI is shown in FIG. 17.

[0066] According to the above description, it is possible to specify multiple sidelink communication frequency bands for the terminal 30A, and even when sidelink communication is performed by a single sidelink communication, it is possible to specify a sidelink communication frequency band other than the default.

[0067] FIG. 14 is a flowchart illustrating an example of a processing procedure performed by the terminal 30A according to the second embodiment when operating in accordance with flexible allocation of sidelink communication frequency bands.

[0068] The control unit 301 of the terminal 30A may start the processing procedure shown in Fig. 14 when the base station 10 allocates radio resources and the sidelink communication becomes possible. Alternatively, the control unit 301 of the terminal 30A may start the processing procedure shown in Fig. 14 when the control unit 301 transmits a sidelink communication request to the base station 10. Alternatively, the control unit 301 of the terminal 30A may start the processing procedure shown in Fig. 14 when the terminal 30A is connected to the base station 10. Moreover, this flowchart is performed by the control unit 301 reading and executing a computer program stored in the storage unit 302.

[0069] The terminal 30A judges whether or not DCI has been received (S1401). If the result of S1401 is No, the process returns to the processing procedure of S1401.

[0070] If S1401 is Yes, the terminal 30A determines whether or not the DCI includes sidelink communication frequency band information (S1402). An example of DCI including sidelink communication frequency band information is shown in Fig. 13. Also, an example of DCI not including sidelink communication frequency band information is shown in Fig. 15.

[0071] If S1402 is Yes, the terminal 30 performs sidelink communication using radio resources of the sidelink communication frequency band specified by the DCI (S1403).

[0072] If the result of S1402 is No, the sidelink communication is performed using radio resources of the default sidelink communication frequency band (S1404).

[0073] In addition, in S1403 or S1404, the terminal 30 may perform sidelink communication with the terminal 30B using radio resources of the sidelink communication frequency band specified by the DCI.

[0074] According to the above description, sidelink communication is possible even in a plurality of sidelink communication frequency bands, and even in a single sidelink communication, communication is possible in a sidelink communication frequency band other than the default.

[0075] <Third embodiment> In the third embodiment, the functional configuration of the base station 10, the software functional block configuration of the base station 10, the functional configuration of the terminal 30, the software functional block configuration of the terminal 30, and the network configuration may be the same as those in Figures 1, 2, 3, and 4, as in the first embodiment.

[0076] In the following description, the base station 10 notifies the terminals 30A and 30B of the sidelink communication frequency band. When the terminal 30A receives the notification, the terminal 30A performs sidelink communication with the terminal 30B in the sidelink communication frequency band specified by the base station 10.

[0077] FIG. 16 is a flowchart showing an example of a processing procedure performed by the base station 10 for enabling sidelink communication in a plurality of sidelink communication frequency bands.

[0078] The base station 10 starts the process procedure shown in Fig. 16 when allocating radio resources for sidelink communication to the terminal 30A. The control unit 101 of the base station 10 may start the process procedure shown in Fig. 16 when receiving a sidelink communication request from the terminal 30A. Alternatively, the control unit 101 of the base station 10 may start the process procedure shown in Fig. 16 when the terminal 30A connects to the base station 10. The process procedure shown in Fig. 16 is performed by the control unit 101 reading and executing a computer program stored in the storage unit 102.

[0079] The base station 10 performs the scheduling process in the default sidelink communication frequency band (S1601).

[0080] Next, the base station 10 determines whether or not to allow the terminal 30A to communicate in a plurality of sidelink communication frequency bands (S1602).

[0081] If S1602 is Yes, the base station 10 performs the scheduling process in an additional sidelink communication frequency band other than the default sidelink communication frequency band (S1603).

[0082] Next, the base station 10 transmits DCI including a plurality of pieces of sidelink communication frequency band information (S1604). An example of this data structure is shown in Fig. 17. Note that the first sidelink communication frequency band corresponds to SCI format 1-A fields 1, and the second sidelink communication frequency band corresponds to SCI format 1-A fields 2. Also, Fig. 17 shows an example of DCI including two pieces of sidelink communication frequency band information, but the same applies to DCI including three or more pieces of sidelink communication frequency band information.

[0083] If S1602 is No, the base station 10 transmits DCI that does not include sidelink communication frequency band information (S1605).

[0084] According to the above description, it is possible to specify multiple sidelink communication frequency bands for the terminal 30A, and by transmitting DCI that does not include sidelink communication frequency band information, resource scheduling is also possible for conventional terminals.

[0085] The flowchart of the process performed by the terminal 30A shown in FIG. 14 may also be applied to the third embodiment.

[0086] The terminal 30A performs sidelink communication with the terminal 30B in the sidelink communication frequency band determined in S1403 or S1404.

[0087] As a result, sidelink communication is possible even when there are multiple sidelink communication frequency bands, and even if the terminal 30B is a conventional terminal, it is possible to perform sidelink communication between the terminal 30B and the terminal 30A.

[0088] <Modification> In the above-described embodiment, it is assumed that the base station 10 notifies the terminal 30 of the frequency band and resources of the sidelink communication using a signal of NR (New Radio) of the 3GPP standard. However, this is not limited to this, and it is also possible to configure the terminal 30 to notify the frequency band and resources of the sidelink communication using a signal of a successor standard such as 6G. In the above embodiment, the base station 10 centrally manages the frequency bands and resources of the sidelink communication to be used by the surrounding terminals. However, the device that performs the control of centrally managing the frequency bands and resources of the sidelink communication to be used by the surrounding terminals is not limited to the base station 10. For example, the management function can be assigned to roadside devices such as traffic lights and surveillance cameras in V2X communication, and sensor nodes embedded in roads. In this case, the roadside device centrally manages the frequency bands and resources of the sidelink communication to be used by the surrounding terminals, and notifies the surrounding terminals of the frequency bands and resources of the sidelink communication to be used. In this case, the roadside device may be configured to notify the surrounding terminals of the frequency bands and resource allocation information of the sidelink communication via a PSCCH (Physical Sidelink Control Channel). The resource allocation information and the information indicating the frequency band of the sidelink communication can be included in SCI (Sidelink Control Information). In the above embodiment, as a specific method for a base station to transmit information on the SCI or information indicating a frequency band of sidelink communication, the base station includes the information in the DCI transmitted via the PDCCH. However, the present invention is not limited to this. For example, the present invention can be modified so that the information on the SCI or information indicating a frequency band of sidelink communication is included in an information element other than the DCI transmitted via the PDCCH. <Other embodiments> The present disclosure may be configured such that a recording medium on which a program code of software for realizing the above-mentioned functions is recorded is supplied to a system or device, and a computer (CPU, MPU) of the system or device reads and executes the program code stored in the recording medium. In this case, the program code itself read from the storage medium realizes the functions of the above-mentioned embodiments, and the storage medium on which the program code is stored constitutes the present invention.

[0089] 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.

[0090] In addition, the above-mentioned functions may be realized not only by the computer executing the read program code, but also by the OS running on the computer performing all or part of the actual processing based on the instructions of the program code. OS is an abbreviation for Operating System.

[0091] 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.

[0092] In addition, the following supplementary notes are disclosed regarding the above embodiment. <Appendix 1> A base station in a network system in which a base station schedules sidelink communication resources, A designation means for designating a frequency band to be used for sidelink communication; A notification means for notifying a terminal of the frequency band; A base station comprising: <Appendix 2> The designation means designates a plurality of frequency bands to be used for the sidelink communication, The notification means notifies the terminal of the plurality of frequency bands. 2. A base station as defined in claim 1. <Appendix 3> The notifying means notifies the terminal of the plurality of frequency bands by including information indicating a frequency band designated from the plurality of frequency bands in each of the plurality of Downlink Control Information. 3. A base station as defined in claim 2. <Appendix 4> The notifying means notifies the terminal of the plurality of frequency bands by including information indicating the plurality of frequency bands in one Downlink Control Information. 3. A base station as defined in claim 2. <Appendix 5> The notifying means notifies the terminal of the frequency band by including information indicating the frequency band in Downlink Control Information. 5. The base station of claim 1 . <Appendix 6> The notifying means notifies the terminal of the frequency band by including information indicating the frequency band in Sidelink Control Information. 5. The base station of claim 1 . <Appendix 7> The notification means notifies the terminal of the frequency band by using a Physical Downlink Control Channel. 7. The base station of claim 1. <Appendix 8> The frequency bands are designated operating bands. 8. The base station of claim 1. <Appendix 9> A terminal in a network system in which a base station schedules sidelink communication resources, An acquisition means for acquiring a frequency band used for sidelink communication from a base station; A communication means for performing sidelink communication in the frequency band; A terminal comprising: <Appendix 10> The acquisition means acquires a plurality of frequency bands to be used for the sidelink communication from the base station, The communication means performs the side link communication in the plurality of frequency bands. 7. The device described in Appendix 9. <Appendix 11> The acquiring means acquires the plurality of frequency bands by acquiring information indicating a frequency band included in each of the plurality of pieces of Downlink Control Information. 10. A device as described in Appendix 10. <Appendix 12> the acquiring means acquires the plurality of frequency bands by acquiring information indicating the plurality of frequency bands included in one piece of Downlink Control Information; 10. A device as described in Appendix 10. <Appendix 13> The acquiring means acquires the frequency band by acquiring information indicating the frequency band included in Downlink Control Information. 13. A terminal according to any one of appendixes 9 to 12. <Appendix 14> The acquiring means acquires the frequency band via a Physical Downlink Control Channel. 14. A terminal according to any one of appendixes 9 to 13. <Appendix 15> The frequency bands are designated operating bands. 15. A terminal according to any one of appendixes 9 to 14. [Explanation of symbols]

[0093] 10 base station 30 Terminals 101 Control section 102 Storage section 103 Radio receiving unit 104 Radio transmitter 201 Software Function Blocks 202 Signal transmission unit 203 Signal receiving unit 204 Data storage unit 205 Scheduling Department 206 Frequency band designation section 207 Frequency band notification unit 208 Radio wave usage status acquisition unit 209 Noise level acquisition unit 210 Terminal Capability Acquisition Unit 301 Control Unit 302 Storage section 303 Radio receiving unit 304 Radio transmitter 305 Output section 401 Software Function Blocks 402 Signal transmitter 403 Signal receiving unit 404 Data Storage Unit 405 Input / Output Control Unit 406 Frequency band acquisition unit

Claims

1. A base station capable of communication in accordance with the 3GPP standard, In a network system where the base station is responsible for scheduling sidelink communication resources, It has a transmission means for transmitting Downlink Control Information (DCI) to a communication terminal, A base station, wherein the DCI includes a field relating to Sidelink Control Information (SCI) that includes information about frequency resources in the frequency band available for the sidelink communication, and a field indicating information about the frequency band available for the sidelink communication.

2. The transmission means transmits a plurality of DCIs, The base station according to claim 1, wherein each of the plurality of DCIs includes one field indicating information about the frequency band available for the sidelink communication.

3. The base station according to claim 1, wherein the DCI includes a plurality of fields indicating information on a plurality of frequency bands usable for the sidelink communication.

4. The base station according to claim 1, wherein the transmitting means transmits information on the frequency band available for the sidelink communication to the communication terminal using the Physical Downlink Control Channel.

5. The base station according to claim 1, wherein the information on the frequency band available for the sidelink communication is indicated by the operating band.

6. The base station according to claim 1, wherein the DCI includes a plurality of fields relating to the SCI.

7. The base station according to claim 1, wherein the DCI further includes at least one of a field indicating an index for resource pools, a field indicating an index for subchannel allocation, and a field indicating an index for sidelink allocation.

8. A base station capable of communication in accordance with the 3GPP standard, In a network system where the base station is responsible for scheduling sidelink communication resources, It has a transmission means for transmitting Downlink Control Information (DCI) to a communication terminal, The DCI includes fields related to Sidelink Control Information (SCI) that contain information about frequency resources in the frequency band available for the sidelink communication, A base station, wherein the field relating to the SCI includes a field indicating information about the frequency band available for the sidelink communication.

9. The base station according to claim 8, wherein the field relating to the SCI includes a plurality of fields indicating information on the frequency band usable for the sidelink communication.

10. A communication terminal in a network system where the base station schedules the resources for sidelink communication, The system has receiving means for receiving Downlink Control Information (DCI) from the base station, A communication terminal wherein the DCI includes a field relating to Sidelink Control Information (SCI) that contains information about frequency resources in the frequency band available for the sidelink communication, and a field indicating information about the frequency band available for the sidelink communication.

11. The communication terminal according to claim 10, further comprising a communication means for performing sidelink communication using information of a frequency band usable for sidelink communication received by the receiving means.

12. The communication terminal according to claim 10, wherein the receiving means receives information on the frequency band available for the sidelink communication via the Physical Downlink Control Channel.

13. The communication terminal according to claim 10, wherein the information on the frequency band available for the sidelink communication is indicated by the operating band.

14. A communication method performed by a base station in a network system in which the base station schedules the resources for sidelink communication, It has a transmission process that transmits Downlink Control Information (DCI) to a communication terminal. A communication method wherein the DCI includes a field relating to Sidelink Control Information (SCI) that includes information about frequency resources in the frequency band available for the sidelink communication, and a field indicating information about the frequency band available for the sidelink communication.

15. A communication method performed by a communication terminal in a network system in which a base station schedules the resources for sidelink communication, The system includes a receiving step for receiving Downlink Control Information (DCI) from the base station, A communication method wherein the DCI includes a field relating to Sidelink Control Information (SCI) that includes information about frequency resources in the frequency band available for the sidelink communication, and a field indicating information about the frequency band available for the sidelink communication.

16. A program for causing a computer to function as a base station according to any one of claims 1 to 9.

17. A program for causing a computer to function as a communication terminal according to any one of claims 10 to 13.

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