JP6060678B2 - Wireless communication system, mobile body, wireless communication method and program - Google Patents

Description

  The present invention relates to a radio communication system, a mobile unit, a radio communication method, and a program, and more particularly to a radio communication system, a mobile unit, a radio communication method, and a program that perform communication using a narrowband beam.

  In recent years, there has been known a communication method in which an ad hoc network is configured by wireless communication between a plurality of mobile units. For example, each mobile unit performs wireless communication with another mobile unit using an omni antenna. Furthermore, time division multiple access communication (TDMA) is used for wireless communication between mobile units, and a time slot that can be transmitted is assigned to each mobile unit.

  Patent Document 1 discloses a mobile information sharing system for sharing position information of each mobile object in an ad hoc network having a plurality of mobile objects. Specifically, the mobile body information sharing system includes a plurality of mobile bodies and a large mobile body. In order to reduce the calculation processing burden of the position information in each moving body, the large moving body generates position information of each moving body based on information such as machine body information transmitted from each moving body. A large mobile body transmits the positional information produced | generated with respect to each mobile body using an omni antenna. Each mobile unit receives transmission data transmitted from a large mobile unit using an omni antenna, and shares position information of a plurality of mobile units in the wireless network.

JP 2008-241429 A

  The mobile body information sharing system disclosed in Patent Document 1 does not perform data communication related to position information between mobile bodies, and each mobile body transmits data related to position information transmitted from a large mobile body using an omni antenna. By receiving this, it is possible to acquire position information of other moving objects. The omni antenna is an omnidirectional antenna. Therefore, even if the data transmitted using the omni antenna is a mobile object that is not permitted to share information in the mobile information sharing system, it can be easily transmitted within the reach of the transmission data transmitted from the large mobile object. There is a problem that information can be acquired.

  In order to solve such a problem, an object of the present invention is to provide a wireless communication system, a mobile body, a wireless communication method, and a program capable of preventing information leakage and sharing information about the mobile body.

  A wireless communication system according to a first aspect of the present invention is a wireless communication system in which wireless communication is performed between a plurality of mobile bodies, and the first mobile body relates to a second mobile body in which direct wireless communication is not performed. When acquiring information, the first mobile unit performs direct wireless communication with the first mobile unit using a narrowband beam and further performs direct wireless communication with the second mobile unit using a narrowband beam. It is comprised so that the information regarding the said 2nd moving body may be acquired from the 3rd moving body to perform.

  The mobile body according to the second aspect of the present invention is a mobile body included in a wireless communication system in which wireless communication is performed between a plurality of mobile bodies, and acquires information regarding a non-connected mobile body that does not perform direct wireless communication. In this case, direct wireless communication is performed using the narrow band beam with the own apparatus, and communication for acquiring information related to the unconnected mobile body from the connected mobile body that performs direct wireless communication with the unconnected mobile body using the narrow band beam. It has a part.

  A radio communication method according to a third aspect of the present invention is a radio communication method for a mobile unit included in a radio communication system in which radio communication is performed between a plurality of mobile units, and is a non-connection mobile that does not perform direct radio communication. When acquiring information related to a body, the wireless communication device directly performs wireless communication using a narrow-band beam with its own device, and further relates to the non-connected mobile body from a connected mobile body that performs direct wireless communication using the narrow-band beam. A step of acquiring information.

  A program according to a fourth aspect of the present invention is a program that is executed by a mobile computer included in a wireless communication system in which wireless communication is performed between a plurality of mobile objects, and that is not connected directly and does not perform wireless communication. When acquiring information related to a body, the wireless communication device directly performs wireless communication using a narrow-band beam with its own device, and further relates to the non-connected mobile body from a connected mobile body that performs direct wireless communication using the narrow-band beam. A computer executes a process of acquiring information.

  According to the present invention, it is possible to provide a wireless communication system, a mobile body, and a wireless communication method capable of preventing information leakage and sharing information about the mobile body.

1 is a configuration diagram of a radio communication system according to a first exemplary embodiment; 1 is a configuration diagram of a moving body according to a first exemplary embodiment. It is a figure explaining the narrow-band beam concerning Embodiment 1. FIG. It is a figure explaining the information hold | maintained at the periphery moving body information database concerning Embodiment 1. FIG. It is a figure explaining the information hold | maintained at the periphery moving body information database concerning Embodiment 1. FIG. It is a figure explaining the information hold | maintained at the periphery moving body information database concerning Embodiment 1. FIG. It is a figure explaining the information hold | maintained at the periphery moving body information database concerning Embodiment 1. FIG. FIG. 3 is a configuration diagram of frames and time slots assigned by TDMA according to the first exemplary embodiment; It is a figure explaining the exclusive time slot and pool time slot concerning Embodiment 1. FIG. It is a figure explaining the flow of the message transmission process in the mobile body concerning Embodiment 1. FIG. It is a figure explaining the flow of the message reception process in the mobile body concerning Embodiment 1. FIG. FIG. 3 is a configuration diagram of a radio communication system according to a second exemplary embodiment. It is a figure explaining the information hold | maintained at the periphery moving body information database concerning Embodiment 2. FIG. It is a figure explaining the information hold | maintained at the periphery moving body information database concerning Embodiment 2. FIG. It is a figure explaining the information hold | maintained at the periphery moving body information database concerning Embodiment 2. FIG. It is a figure explaining the exclusive time slot and pool time slot concerning Embodiment 3. FIG.

(Embodiment 1)
Embodiments of the present invention will be described below with reference to the drawings. A configuration example of the wireless communication system according to the first exemplary embodiment of the present invention will be described with reference to FIG. The wireless communication system includes mobile units 1 to 4. The mobile body may be, for example, a mobile terminal (a mobile phone, a personal digital assistant (PDA), a laptop computer, etc.), an automobile, an aircraft, a ship, a railroad, or a pedestrian. The mobile body 1 and the mobile body 3 perform wireless communication using a narrow band beam. For example, the narrowband beam may be referred to as a pencil beam. Similarly, the mobile body 1 and the mobile body 4, the mobile body 2 and the mobile body 3, and the mobile body 2 and the mobile body 4 also perform wireless communication using narrowband beams. The mobile body 1 and the mobile body 2 do not perform direct wireless communication. Here, the beam may be an electromagnetic beam such as light, microwave, millimeter wave, or X-ray, or may be an ultrasonic beam or a particle beam.

  When the mobile body 1 acquires information about the mobile body 2, the mobile body 1 acquires information about the mobile body 2 from the mobile body 3 that performs direct wireless communication. Between the mobile bodies that perform direct wireless communication, the respective mobile bodies facing each other transmit information to be held to the mobile body facing each other. In this case, for example, the moving body 3 transmits information on the moving body 2 that is held to the moving body 1. When each of the mobile bodies facing each other has not previously acquired information on other mobile bodies, for example, when the mobile body 3 has not previously acquired information on the mobile body 2, the mobile body 3 Information regarding the moving body 2 may be acquired from the moving body 2 in response to the acquisition request, and the acquired information may be transmitted to the moving body 1.

  For example, the information on the moving body includes the position information of the moving body, the information on the destination to which the moving body heads, the image information that the moving body has. The information regarding the moving body is not limited to these, and all of the information that the moving body has may be used as information to be collected.

  As described above, in the wireless communication system of FIG. 1, wireless communication is performed between mobile bodies using a narrowband beam. Therefore, compared with the case where wireless communication is performed using an omni antenna, it is possible to reduce the possibility of information leaking to mobile bodies that are not subject to information sharing.

  Next, a configuration example of the moving body 1 included in the wireless communication system according to the first embodiment of the present invention will be described with reference to FIG. Since the mobile bodies 1 to 4 have the same configuration, only the configuration of the mobile body 1 will be described in FIG. 2, and description of other mobile bodies will be omitted.

  The mobile unit 1 includes a communication unit 11, a peripheral mobile unit information database (DB) 12, and a message generation unit 13.

  The communication unit 11 performs data transmission using a narrowband beam that is output to another moving body. Furthermore, the communication unit 11 performs data reception using a narrowband beam output from another moving body. The communication unit 11 may transmit its own position information and information regarding which mobile body it is connected to to other mobile bodies. Moreover, the communication part 11 may receive the information regarding which mobile body the position information of another mobile body and other mobile bodies are connected to from other mobile bodies. Here, the connection with the mobile body is intended to make it possible to transmit and receive data using the mobile body and a narrow band beam.

  In addition, the communication unit 11 is configured using a directional antenna, and in order to receive data using a narrowband beam output from another mobile body, the communication unit 11 transmits a narrowband beam through the directional antenna. Orient in the direction. Thereby, the receiving antenna gain in the mobile body 1 can be improved with respect to the narrowband beam transmitted from another mobile body. Therefore, the mobile body that transmits the narrowband beam can transmit the narrowband beam to the mobile body 1 by reducing the transmission power as compared with the case where the omni antenna is used in the mobile body 1.

  Here, the narrowband beam will be described with reference to FIG. FIG. 3 shows a state in which the beam width of the narrow band beam output from the moving body 1 increases as the distance from the moving body 1 increases. For example, the beam width of the narrow band beam at the point A is 100 meters. Further, the beam width of the narrow band beam at the point B is 1 km, the beam width of the narrow band beam at the point C is 5 km, and the beam width of the narrow band beam at the point D is 10 km. A numerical value indicating the distance from the moving body 1 may be used for A to D. The beam width at the points A to D varies depending on the beam divergence angle indicating the angle. The beam divergence angle may be adjusted in the moving body 1.

  Returning to FIG. 2, the peripheral mobile body information DB 12 holds the number of hops to other mobile bodies generated based on the information on which mobile body the other mobile bodies received in the communication unit 11 are connected to. Has been. Here, information held in the peripheral mobile body information DB 12 of the mobile body 1 will be described with reference to FIG. 4A.

  In the peripheral mobile body information DB 12, a mobile body number and the number of hops are associated. The body number is a code for identifying the mobile bodies 1 to 4, 1 for the mobile body 1, 2 for the mobile body 2, 3 for the mobile body 3, and 4 for the mobile body 4. Assigned. The number of hops is determined based on information on which mobile body the other mobile body is connected to. Specifically, the mobile body 3 and the mobile body 4 that are directly performing wireless communication with the mobile body 1 are recorded in the peripheral mobile body information DB 12 with a hop count of 1. Furthermore, when the mobile body 1 receives information that the mobile body 3 is connected to the mobile body 2, the mobile body 1 records the number of hops between the mobile body 2 as 2 in the peripheral mobile body information DB 12. 4B is information held in the peripheral mobile body information DB 12 of the mobile body 2, FIG. 4C is information held in the peripheral mobile body information DB 12 of the mobile body 3, and FIG. This is information held in the peripheral mobile body information DB 12 of the mobile body 4. 4B to 4D, the mobile body number and the hop count are associated with each other as in FIG. 4A.

  Returning to FIG. 2, the message generation unit 13 generates a transmission message to be transmitted from the communication unit 11. In wireless communication between mobile units, data is transmitted and received between mobile units that are paired using time slots assigned by TDMA (Time Division Multiple Access). The message generation unit 13 generates a message to be set in the time slot assigned to the mobile unit 1. At this time, full-duplex communication becomes possible by the pair of mobile bodies irradiating each other with narrow-band beams. Further, in each time slot, half-duplex communication is possible by performing communication so that one mobile body irradiates the other mobile body with a narrow-band beam. Here, a configuration example of time slots assigned by TDMA will be described with reference to FIG.

  FIG. 5 shows a configuration in which frames 1 to 10 are assigned in 2 seconds. In addition, each frame has a plurality of dedicated time slots and a plurality of pool time slots. The pool time slot is a time slot used as a spare other than the dedicated time slot, and may be referred to as a spare time slot. Dedicated time slots are identified using 1, 2, 3, etc. as slot numbers. Pool time slots are identified using 1 ′, 2 ′, 3 ′, etc. as slot numbers. Hereinafter, messages transmitted in each time slot will be described.

  The mobile body 1 does not perform direct wireless communication with the mobile body 2. Therefore, when the mobile body 1 needs to acquire information about the mobile body 2, the mobile body 1 acquires information about the mobile body 2 from the mobile body 3. Therefore, when the dedicated time slot allocated to perform data transmission / reception between the mobile unit 1 and the mobile unit 3 is 3, the mobile unit 1 provides information on the mobile unit 2 to the mobile unit 3. Is set in the dedicated time slot 3. Furthermore, the mobile unit 1 also sets a message instructing to use the pool time slot 4 in the dedicated time slot 3 when transmitting information about the mobile unit 2. In other words, the mobile unit 1 sets a message instructing to transmit information regarding the mobile unit 2 in the pool time slot 4 in the dedicated time slot 3.

  The mobile unit 3 sets and transmits information related to the mobile unit 2 in the pool time slot 4 as instructed in the message set in the dedicated time slot 3.

  Here, the mobile body 3 may receive an instruction message from another mobile body different from the mobile body 1 to transmit information about the mobile body using the pool time slot 4. For example, when there are 7 dedicated time slots assigned to transmit / receive data between the mobile unit 2 and the mobile unit 3, the mobile unit 2 stores information on the mobile unit 1 in the dedicated time slot 7. A message instructing transmission in the time slot 4 is set. As described above, when different mobile units 1 and 2 specify the same pool slot and instruct information transmission, the mobile unit 3 sets the pool time slot based on the priority set in the dedicated time slot. Information may be selected. That is, the mobile unit 3 may select information to be set in the pool time slot according to the content of the message having a high priority set in the dedicated time slot.

  As described above, an instruction message for the opposite device is set in the dedicated time slot between the opposite devices in which direct wireless communication is performed. On the other hand, in the pool time slot, information related to a mobile unit that is required for the mobile unit that has set the instruction message and that does not directly perform wireless communication is set. . Alternatively, the message set in the dedicated time slot may be repeatedly set in the pool time slot in order to ensure the redundancy of the message set in the dedicated time slot. Further, the number of frames allocated to one second is not limited to five, and the number of frames allocated to one second can be set to an arbitrary number by changing the time set for the frame.

  Here, the number of dedicated time slots and pool time slots in one frame will be described with reference to FIG. The following preconditions are set when determining the number of dedicated time slots and pool time slots in one frame.

  As a first precondition, it is assumed that communication between opposite devices can be performed by full-duplex communication. In this case, a sufficient guard band is secured between the transmission frequency and the reception frequency used for full-duplex communication.

  As a second precondition, there are 8 mobile units in the wireless communication system, and 4 pairs can simultaneously communicate in one time slot.

  As a third precondition, it is assumed that the time width of one frame is 200 ms, the time width of one time slot is about 10 ms, and 20 time slots are set in one frame.

  In this way, considering the three preconditions, there are 28 combinations in which 8 mobile units respectively perform full duplex opposite communication. The 28 ways are based on the calculation result of 8C2 = 28.

  In addition, since 4 pairs can communicate simultaneously in one time slot, time slots can be assigned to 28 combinations by using 7 time slots.

  As a result, the number of dedicated time slots used for opposing communication in which a pair of mobile objects is determined in advance can be seven. The slot numbers of the dedicated time slots are 1-7. The remaining 13 can be used as pool time slots, but the pool time slots may be used in the following manner.

  First, the same seven time slots as the number of dedicated time slots are defined as pool time slot I. The slot numbers of the pool time slot I are 1 ′ to 7 ′. The pool time slot I may be used to repeatedly set the message set in the dedicated time slot in order to ensure the redundancy of the message set in the dedicated time slot. Alternatively, the pool time slot I may be used to set information related to a mobile unit that does not directly perform wireless communication with a mobile unit that has set an instruction message in a dedicated time slot.

  The remaining six time slots are designated as pool time slot II. The slot numbers of pool time slot II are A to F. The pool time slot II may be used to set information related to a mobile unit that does not directly communicate with a mobile unit that has set an instruction message in the dedicated time slot, or may be used for other purposes.

  As described above, the number of dedicated time slots and pool time slots is determined mainly depending on the number of mobile units existing in the wireless communication system and the number of pairs that can simultaneously communicate in one time slot. It is done.

  Returning to FIG. 2, the message generation unit 13 generates a message to be set in the dedicated time slot and a message to be set in the pool time slot, and outputs the generated message to the communication unit 11. At this time, the message generation unit 13 may set the priority for the message set in the dedicated time slot. Further, the message generation unit 13 may select from which moving body the information that needs to be acquired is acquired. For example, when the mobile body 1 acquires information about the mobile body 2, information about the mobile body 2 can be acquired from the mobile body 3 or the mobile body 4. In such a case, the moving body 1 may select the moving body based on the electric field strength between the moving body 3 and the moving body 4 or the number of hops to the moving body 2.

  Next, the flow of message transmission processing in the mobile unit will be described with reference to FIG. First, the mobile 1 determines information that needs to be obtained (hereinafter referred to as obtained information) (S11). The acquisition information may be determined by a control unit (not shown) such as a CPU (Central Processing Unit) in the mobile body 1, for example. For example, the information that needs to be acquired in the mobile body 1 is position information of the mobile body 2 that does not perform direct wireless communication.

  Next, the message generator 13 sets the priority of the determined acquisition information (S12). As the priority, for example, an identifier indicating high, medium, or low may be used. When there is a predetermined rule for setting the priority for the obtained information, each mobile unit may set the priority for the message based on the predetermined rule.

  Next, the message generator 13 selects from which moving body the acquisition information is acquired (S13). For example, when the moving body 1 needs to acquire information on the moving body 2, the moving body 1 can acquire information on the moving body 2 from the moving body 3 or the moving body 4. The mobile 1 may select the mobile from which the acquisition information is acquired based on the number of hops to the mobile 2 or the electric field strength between the mobile 3 and the mobile 4. For example, the number of hops to the moving body 2 is 1 for both the moving body 3 and the moving body 4. Since the number of hops from the mobile unit 1 to the mobile unit 2 is the same, the mobile unit 1 may select the mobile unit having the larger electric field strength with the mobile unit 3 or 4 as the mobile unit that acquires the acquisition information.

  The message generation unit 13 sets the priority of the acquisition information and the pool time slot number for setting the acquisition information in the dedicated time slot assigned to the communication with the mobile unit selected as the mobile unit from which the acquisition information is acquired. (S14).

  Next, the communication unit 11 transmits the message set in the message generation unit 13 (S15).

  Next, the flow of processing in the mobile unit when a message transmitted through the transmission processing in FIG. 7 is received will be described with reference to FIG. In FIG. 8, the flow of message reception processing in the mobile 3 will be described. The mobile 3 extracts a message addressed to itself set in a dedicated time slot assigned to the mobile device 3 (S21). Next, the mobile unit 3 determines whether there are a plurality of messages requesting information on the mobile unit (S22). When there is one message requesting information on the moving body instead of a plurality of messages, the moving body 3 sets the designated information in the designated pool time slot (S23).

  In step S22, when the mobile unit 3 determines that there are a plurality of messages requesting information on the mobile unit, it is determined whether or not the pool time slots designated for transmitting information in the plurality of messages overlap. Determine (S24). When it is determined that the designated pool time slot is not duplicated, the mobile unit 3 sets the designated information in the designated pool time slot (S23).

  In step S24, when the mobile unit 3 determines that the designated pool time slot is duplicated, the mobile unit 3 checks the priority set in the extracted message (S25). The mobile 3 sets the information specified in the high priority message in the specified pool time slot (S23).

  Here, as a result of the comparison of priorities, the mobile unit that has not been able to acquire information using the designated pool time slot displays a message instructing to acquire the same information again in the next frame. It may be set to a slot. At this time, the message generation unit 13 of the mobile body may set the priority set for the message one step higher. Thus, by setting the priority level higher by one level, it is possible to increase the possibility that information can be acquired using the pool time slot in the next frame.

  As described above, by using the wireless communication system according to the first embodiment of the present invention, it is possible to perform communication between mobile units using dedicated time slots and pool time slots. Further, by using the pool time slot, it is possible to acquire information related to a mobile body that is not directly connected. Therefore, even if it does not comprise the state of the full mesh connection in which all the mobile bodies in the radio communication system are connected, the mobile bodies in the radio communication system can share information regarding other mobile bodies.

(Embodiment 2)
Next, a configuration example of the wireless communication system according to the second exemplary embodiment of the present invention is described with reference to FIG. The radio | wireless communications system concerning this figure has shown the example in which the mobile bodies 21-23 are located in a line on a straight line. Since each structure of the moving bodies 21-23 is the same as that of the moving body 1 in FIG. 2, detailed description is abbreviate | omitted. Narrowband beams are also used for communication between moving objects in the figure. When the moving bodies 21 to 23 are arranged on a straight line as shown in the figure, the moving body 22 blocks the narrow band beam between the moving body 21 and the moving body 23. Therefore, the mobile body 21 cannot directly perform wireless communication with the mobile body 23.

  Here, the information hold | maintained in each periphery moving body information DB12 of the moving bodies 21-23 is demonstrated using FIG. 10A-FIG. 10C.

  FIG. 10A shows information held in the peripheral mobile body information DB 12 of the mobile body 21. Since the mobile unit 21 can directly wirelessly communicate with the mobile unit 22, the number of hops is set to one. In addition, the mobile unit 21 cannot directly perform wireless communication with the mobile unit 23, but the number of hops is set to 2 because the mobile unit 22 and the mobile unit 23 can perform direct wireless communication. FIG. 10B shows information held in the peripheral mobile body information DB 12 of the mobile body 22. Since the mobile unit 22 can directly perform wireless communication with the mobile unit 21 and the mobile unit 23, the number of hops is set to 1, respectively. FIG. 10C shows information held in the peripheral mobile body information DB 12 of the mobile body 23. Since the mobile unit 23 can perform wireless communication directly with the mobile unit 22, the number of hops is set to 1. In addition, the mobile unit 23 cannot directly perform wireless communication with the mobile unit 21, but the mobile unit 21 and the mobile unit 22 can directly perform wireless communication.

  In such a case, for example, when the mobile body 21 acquires information on the mobile body 23 that does not directly perform wireless communication, the mobile body 21 acquires information on the mobile body 23 from the mobile body 22. Specifically, when the dedicated time slot 2 shown in FIG. 5 is allocated for the opposite communication of the mobile body 21 and the mobile body 22, the mobile body 21 is assigned to the dedicated time slot 2 with respect to the mobile body 22. For example, a message instructing transmission of information related to the moving body 23 in the pool time slot 4 is set.

  The mobile unit 22 that has received the instruction message set in the dedicated time slot 2 sets and transmits information related to the mobile unit 23 in the designated pool time slot 4.

  As described above, even when direct communication between moving bodies is blocked by arranging moving bodies on a straight line as shown in the second embodiment of the present invention, they are directly connected using pool time slots. Information about no moving objects can be obtained.

(Embodiment 3)
Next, a method for setting the number of dedicated time slots and pool time slots in one frame according to the third embodiment of the present invention will be described with reference to FIG. The following preconditions are set when determining the number of dedicated time slots and pool time slots in one frame. The first and third preconditions described below are the same as the preconditions described in FIG. The second precondition is different from the precondition described in FIG.

  As a first precondition, it is assumed that communication between opposite devices can be performed by full-duplex communication. In this case, a sufficient guard band is secured between the transmission frequency and the reception frequency used for full-duplex communication.

  As a second precondition, there are 8 mobile units in the wireless communication system, and two pairs can simultaneously communicate in one time slot.

  As a third precondition, it is assumed that the time width of one frame is 200 ms, the time width of one time slot is about 10 ms, and 20 time slots are set in one frame.

  In this way, considering the three preconditions, there are 28 combinations in which 8 mobile units respectively perform full duplex opposite communication. The 28 ways are based on the calculation result of 8C2 = 28.

  Further, since two pairs can communicate simultaneously in one time slot, time slots can be assigned to 28 combinations by using 14 time slots.

  As a result, the number of dedicated time slots used for opposing communication in which a pair of mobile objects is determined in advance can be 14. The slot numbers of the dedicated time slots are 1-14. The remaining 6 can be used as pool time slots.

  The slot numbers of the six pool time slots are A to F. The pool time slot may be used to set information related to a mobile unit that does not directly perform wireless communication with a mobile unit that has set an instruction message in a dedicated time slot, or may be used for other purposes.

  The assignment of dedicated time slots and pool time slots in this figure assumes a case where the number of pairs that can simultaneously communicate in one time slot is smaller than in FIG. The case where the number of pairs that can simultaneously communicate in one time slot is small indicates that the transmission and reception frequencies assigned at the time of opposite communication are smaller than in the case of FIG. When the number of pairs that cannot communicate at the same time is small, it is necessary to increase the number of dedicated time slots, so the number of pool time slots decreases. For this reason, the pool time slot is not used to ensure the redundancy of the message set in the dedicated time slot, but is mainly used for direct wireless communication with the mobile unit in which the instruction message is set in the dedicated time slot. It is desirable to be used to set information about moving objects that are not.

  In the above-described embodiments, the present invention has been described as a hardware configuration, but the present invention is not limited to this. The present invention can also realize message transmission processing in a mobile body by causing a CPU to execute a computer program. )

  In the above example, the program can be stored and supplied to a computer using various types of non-transitory computer readable media. Non-transitory computer readable media include various types of tangible storage media. Examples of non-transitory computer-readable media include magnetic recording media (for example, flexible disks, magnetic tapes, hard disk drives), magneto-optical recording media (for example, magneto-optical disks), CD-ROMs (Read Only Memory), CD-Rs, CD-R / W, semiconductor memory (for example, mask ROM, PROM (Programmable ROM), EPROM (Erasable PROM), flash ROM, RAM (Random Access Memory)) are included. The program may also be supplied to the computer by various types of transitory computer readable media. Examples of transitory computer readable media include electrical signals, optical signals, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

  Note that the present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Mobile body 2 Mobile body 3 Mobile body 4 Mobile body 11 Communication part 12 Peripheral mobile body information DB
13 Message Generator 21 Mobile Object 22 Mobile Object 23 Mobile Object

Claims (17)

A wireless communication system in which wireless communication is performed between a plurality of mobile objects,
When acquiring information related to a second mobile unit that is not directly wirelessly communicated by the first mobile unit,
The first moving body performs direct wireless communication with the first moving body using a narrowband beam and further performs direct wireless communication with the second moving body using a narrowband beam. is configured to obtain information about the second mobile from,
The first mobile unit selects the third mobile unit based on the number of hops from the plurality of mobile units to the second mobile unit,
When the number of hops is the same, the mobile body having the highest electric field strength received by the first mobile body is selected as the third mobile body.
Wireless communication system.   The radio communication system according to claim 1, wherein a frame allocated in a time division multiple access communication system (TDMA) is used for radio communication between the plurality of mobile units. The frame is composed of a plurality of dedicated time slots and a plurality of spare time slots,
The first mobile body sets a message requesting acquisition of information of the second mobile body in a predetermined dedicated time slot,
The third mobile unit sets information on the second mobile unit in a predetermined spare time slot, and transmits information on the second mobile unit to the first mobile unit. The wireless communication system according to 1.   The first mobile unit designates the predetermined spare time slot for setting information of the second mobile unit from the plurality of spare time slots in the predetermined dedicated time slot. The wireless communication system according to 1.   When the predetermined spare time slot is specified redundantly from different mobile units, the predetermined spare time slot is determined according to a priority determined in association with information set in the predetermined spare time slot. The wireless communication system according to claim 4, wherein information set in the slot is determined.   The said backup time slot is used for the setting of the information regarding the mobile body which does not perform the said direct radio | wireless communication, or the reset of the message set to the said exclusive time slot, The Claim 1 thru | or 5 Wireless communication system.   The plurality of mobile units are configured to perform opposite communication between two mobile units, and configured so that frequency bands used for the opposite communication of transmission and reception performed in the same dedicated time slot do not overlap each other. The wireless communication system according to any one of claims 3 to 6.   8. The wireless communication system according to claim 7, wherein the number of the dedicated time slot and the spare time slot in the frame is determined according to the number of opposite communications performed simultaneously in one dedicated time slot.   The mobile unit that receives the narrowband beam output from each mobile unit receives the narrowband beam by directing a reception antenna toward a mobile unit that transmits the narrowband beam. The wireless communication system according to 1. A mobile unit included in a radio communication system in which radio communication is performed between a plurality of mobile units,
When obtaining information about unconnected mobiles that do not perform direct wireless communication,
A communication unit that performs direct wireless communication with the own device using a narrowband beam and further acquires information about the unconnected mobile body from a connected mobile body that performs direct wireless communication with the unconnected mobile body using a narrowband beam; ,
Selecting the connected mobile based on the number of hops from the plurality of mobiles to the unconnected mobile;
When the number of hops is the same, the mobile unit having the largest electric field strength received by the device is selected as the connection mobile unit.
Moving body.   The mobile unit according to claim 10, wherein the communication unit uses a frame assigned in a time division multiple access communication method (TDMA) for wireless communication with the direct wireless communication. The frame is composed of a plurality of dedicated time slots and a plurality of spare time slots,
A message generator configured to set a message for requesting acquisition of information on the unconnected mobile unit in the predetermined dedicated time slot;
The communication unit is
The mobile body according to claim 11, wherein information on the non-connected mobile body set in a predetermined spare time slot is acquired from the connected mobile body. The message generator is
13. The mobile unit according to claim 12, wherein a message for specifying the predetermined spare time slot for setting information on the unconnected mobile unit from among the plurality of spare time slots is set in the predetermined dedicated time slot. .   The mobile unit according to claim 12 or 13, wherein the spare time slot is used for setting information regarding the unconnected mobile unit that does not perform direct wireless communication or resetting a message set in the dedicated time slot.   The mobile unit according to claim 10, wherein the communication unit receives the narrowband beam by directing a reception antenna toward the connection mobile unit. A wireless communication method for a mobile body included in a wireless communication system in which wireless communication is performed between a plurality of mobile bodies,
When obtaining information about unconnected mobiles that do not perform direct wireless communication,
Performing direct wireless communication with the device itself using a narrowband beam, and obtaining information about the unconnected mobile body from a connected mobile body that performs direct wireless communication with the unconnected mobile body using a narrowband beam ;
Selecting the connected mobile based on the number of hops from the plurality of mobiles to the unconnected mobile;
When the number of hops is the same, the step of selecting the mobile body having the largest electric field intensity received by the device as the connection mobile body;
A wireless communication method comprising: A program to be executed by a mobile computer included in a wireless communication system in which wireless communication is performed between a plurality of mobile bodies,
When obtaining information about unconnected mobiles that do not perform direct wireless communication,
Performing direct wireless communication with the device itself using a narrowband beam, and obtaining information about the unconnected mobile body from a connected mobile body that performs direct wireless communication with the unconnected mobile body using a narrowband beam ;
Selecting the connected mobile based on the number of hops from the plurality of mobiles to the unconnected mobile;
When the number of hops is the same, the step of selecting the mobile body having the largest electric field intensity received by the device as the connection mobile body;
A program that causes a computer to execute.

Images