JP5885706B2 - Communications system - Google Patents

Description

  The present invention provides a wireless communication between an in-vehicle wireless device installed in a vehicle traveling on a traveling route and a ground wireless device installed on the ground such as a station in a transportation such as an LRT (Light Rail Transit) or a route bus. The present invention relates to a communication system that performs communication.

  As a railway wireless communication system, a propagation network has been proposed in which information is relayed while wireless communication is performed sequentially between adjacent terrestrial wireless devices (see, for example, Patent Document 1). In the communication system described in Patent Document 1, on-board wireless devices are arranged at the front and rear of a vehicle so that they can communicate with each other, and when there is a vehicle between ground wireless devices that can wirelessly communicate with each other, The information transmission between them can be relayed by two in-vehicle wireless devices mounted on the mobile body.

JP 2013-42344 A

  However, in the prior art, the time division multiple access method is adopted, and it is necessary to install a plurality of terrestrial radio devices to which time slots are allocated along the traveling route. Therefore, in order to synchronize between terrestrial wireless devices, communication must always be performed, increasing the amount of communication. As a result, a high-speed and large-scale wireless network using a band that requires a license must be adopted, and there is a problem that the construction of the communication system becomes expensive and complicated.

  The present invention has been made in view of such problems, and an object of the present invention is to provide an inexpensive communication system using a specific low-power radio that does not require a license.

A communication system according to the present invention is a communication system that performs wireless communication between a wireless device installed in a vehicle traveling on a traveling route and a wireless device installed on the ground, and the wireless device is connected. A frame storage unit in which a frame composed of a command and a telegram is input from a connected device or received from another wireless device, and a frame for analyzing the command of the frame stored in the frame storage unit Analyzing means, and transmission / reception means for transmitting the frame stored in the frame storage means in an operation based on an analysis result by the frame analysis means , wherein the transmission / reception means has a plurality of transmission channels, The frame analysis means analyzes the command input from the connected device and written in the frame storage means, thereby transmitting the frame. Identify the previous transmission channel, characterized by Rukoto to transmit the stored said frame in said frame memory means in transmitting the channel specified in the destination identified by said transmitting and receiving means.
Further, in the communication system according to the present invention, before Symbol frame analysis means is received from another wireless device, wherein the frame by written the command into the storage means to determine whether the relay, not relay In this case, the connected device is made to output the frame stored in the frame storage means, and when it is for relay, the command written in the frame storage means is analyzed to obtain a destination and identify a transmission channel, and wherein said frame stored in said frame storage means transmit the channel specified in the destination was JP boss be transmitted by said transmitting and receiving means.
Furthermore, in the communication system according to the present invention, the transmission / reception means has a plurality of reception channels, and the frame analysis means analyzes the command input from a connected device connected and written in the frame storage means. Thus, a reception channel of the transmission / reception means is set.
Furthermore, in the communication system according to the present invention, the radio devices installed on the ground are installed at stations where the vehicle stops, and two different radio devices are installed at adjacent stations. Each receiving channel is assigned, and the radio installed in the vehicle is set to two receiving channels assigned to the radio installed in any of the stations by the frame analysis means. It is characterized by.

  In the communication system according to the present invention, since the operation of the wireless devices can be controlled by a command written in the frame storage means, it is not necessary to synchronize the wireless devices, and it is inexpensive using a specific low power wireless that does not require a license. A simple communication system can be constructed.

1 is a system configuration diagram of an embodiment of a communication system according to the present invention. It is a block diagram which shows the structure of the vehicle-mounted apparatus and vehicle-mounted radio which are shown in FIG. It is a figure which shows the example of route data memorize | stored in the route data memory | storage part shown in FIG. It is a block diagram which shows the structure of the ground apparatus and ground radio shown in FIG. It is a flowchart for demonstrating the transmission operation | movement of the block notification using the vehicle-mounted radio by the vehicle-mounted apparatus shown in FIG. It is explanatory drawing for demonstrating the transmission operation | movement of the block notification using the vehicle-mounted radio by the vehicle-mounted apparatus shown in FIG. It is a flowchart for demonstrating the block notification production | generation operation | movement of the block notification in the block notification production | generation part shown in FIG. It is a figure which shows the communication procedure of the block notification for direct transmission produced | generated by the block notification production | generation part shown in FIG. It is a figure which shows the communication procedure of the block notification for relay transmission produced | generated by the block notification production | generation part shown in FIG. It is a flowchart for demonstrating operation | movement of the vehicle-mounted radio | wireless apparatus shown in FIG.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

  The communication system according to the present embodiment is used in a transportation system such as an LRT (Light Rail Transit) or a route bus that travels on a predetermined traveling route between vehicles 1 or between a vehicle 1 and a ground base such as a station 2. As shown in FIG. 1, the system performs wireless communication. As shown in FIG. 1, a GPS receiver 10, an in-vehicle device 20, an in-vehicle wireless device 30, and a ground 2 respectively installed in a station 2 where the vehicle 1 stops. The wireless device 40 is composed of a ground device 50.

  The GPS receiver 10 receives GPS signals from a plurality of GPS satellites via a GPS antenna 11 installed on the roof of the vehicle 1 and measures the current position (latitude, longitude) based on the received GPS signals. And outputs the current position (latitude, longitude) as a positioning position. The GPS receiver 10 is configured to execute positioning every predetermined time and output a positioning position. Note that the timing at which the GPS receiver 10 executes positioning and outputs the positioning position may be set in advance, or may be configured to be settable by the user.

  The in-vehicle device 20 is an information processing device such as a microcomputer including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc. As shown in FIG. GPS I / F 21, positioning position receiving unit 22, travel position specifying unit 23, block notification generating unit 24, route data storage unit 25, travel history storage unit 26, and vehicle information storage unit 27. And a wireless I / F 28 that is an interface with the in-vehicle wireless device 30. In the in-vehicle device 20, the ROM stores a control program for controlling the operation of the in-vehicle device 20, and the CPU reads out the control program stored in the ROM and develops the control program in the RAM, so that the above-described control program is stored. It functions as a positioning position receiving unit 22, a traveling position specifying unit 23, and a block notification generating unit 24, respectively.

  The positioning position receiving unit 22 receives the positioning position from the GPS receiver 10 via the GPS I / F 21 and outputs it to the traveling position specifying unit 23.

  The route data storage unit 25 is a storage unit such as a semiconductor memory or an HDD (Hard Disk Drive), and stores route data obtained by blocking the traveling route. The block is area data composed of a station block and a route block set continuously along the travel route. As shown in FIG. 3, the route data is assigned to each block of “station ID”, “block name”, four vertex coordinates (latitude / longitude) of the points a to d of the extra-length block. It consists of a use channel CH. “Station ID” is a unique identification name assigned to each station 2, and “SOO” is assigned thereto. The “block name” is a unique identification name assigned to each block, and “TXXX” is set on the route between the stations 2 for the station block set for the station 2. “RXXX” is assigned to each route block. Furthermore, “axxx”, “bxxx”, “cxxx”, and “dxxx” are coordinates of the four vertices a, b, c, and d (latitude / Longitude). In the present embodiment, as shown in FIG. 4, the points a and c, and the points b and d of adjacent extra-length blocks have common vertex coordinates (latitude / longitude). Therefore, in the route data, either the points a and b or the points c and d can be omitted. Furthermore, the shape of each block does not need to be the same, and the width and length can be adjusted. Further, the channel CH used for reception by the in-vehicle wireless device 30 and the terrestrial wireless device 40 is assigned to each channel area centering on the station 2, and is different in the adjacent station 2 (station area). Each channel CH is assigned.

  The traveling position specifying unit 23 specifies the block where the vehicle 1 is located by comparing the positioning position input from the positioning position receiving unit 22 with the route data stored in the route data storage unit 25. The block is compared with the travel history stored in the travel history storage unit 26 to determine whether or not the vehicle 1 has entered a new block, and it has been determined that the vehicle 1 has entered a new block. In this case, the identified block is output to the block notification generation unit 24 as the current position block. The identified block is output from the travel position specifying unit 23 to the travel history storage unit 26 and stored in the travel history storage unit 26 as a travel history.

  The travel history storage unit 26 is a storage unit such as a semiconductor memory or an HDD (Hard Disk Drive), and sequentially stores the block input from the travel position specifying unit 23 and the input time as a travel history.

  The vehicle information storage unit 27 is a storage unit such as a semiconductor memory or an HDD (Hard Disk Drive), and stores a vehicle ID “XOO” that identifies the installed vehicle 1. Note that the vehicle ID that identifies the installed vehicle 1 may be input by the user from an input unit (not shown), and an external storage medium connection port such as an IC card is provided to store the vehicle ID. A storage medium may be connected to the connection port for input. In the case where a connection port for an external storage medium is provided, the external storage medium itself can function as the vehicle information storage unit 27. Further, the vehicle information storage unit 27 stores the vehicle ID of the other vehicle 1 and the located block (station block, inter-station block) as vehicle information. The vehicle information is updated based on the vehicle registration notification received from the ground device 50 via the ground radio 40 and the in-vehicle radio 30.

  When the vehicle 1 enters a new block and the current position block is input from the travel position specifying unit 23, the block notification generation unit 24 converts the current position block and the route data stored in the route data storage unit 25. Based on this, the station 2 that notifies the current position block is specified. Then, the block notification generation unit 24 generates a frame including a command for setting the operation of the in-vehicle wireless device 30 and a serial message in which the current position block is described as a block notification, and the generated block notification is the wireless I / F 28. And output to the in-vehicle wireless device 30. Further, when the block notification generating unit 24 recognizes the entry of a new station area based on the current position block input from the travel position specifying unit 23, the block notification generating unit 24 switches to the two channels CH allocated to the corresponding station area. A channel switching command for instructing the wireless device 30 is generated, and the generated channel switching command is output to the in-vehicle wireless device 30 via the wireless I / F 28.

  The in-vehicle radio 30 is a low-power radio that transmits a radio frame using a specific low-power radio band that does not require a radio worker qualification or a radio station license if it is a radio facility that satisfies certain conditions determined by the Ministry of Internal Affairs and Communications. It is. As shown in FIG. 2, the in-vehicle wireless device 30 includes a frame storage unit 31, a frame analysis unit 32, an ID storage unit 33, a transmission / reception unit 34, and an antenna 35.

  The frame storage unit 31 is a storage unit such as a semiconductor memory or an HDD (Hard Disk Drive). The frame input from the in-vehicle device 20 is written, and the radio received from the ground radio 40 or another in-vehicle radio 30 is received. A frame is written.

  The frame analysis unit 32 analyzes the frame command written in the frame storage unit 31 from the in-vehicle device 20, thereby causing the transmission / reception unit 34 to execute the operation set by the command.

  The ID storage unit 33 is a storage unit such as a semiconductor memory or an HDD (Hard Disk Drive), and stores a vehicle ID “XOO” that identifies the installed vehicle 1.

  The transmission / reception unit 34 is always set to a reception standby mode that waits for reception, and when a frame is written from the in-vehicle device 20 to the frame storage unit 31, the transmission / reception unit 34 transmits the frame stored in the frame storage unit 31. . The transmission / reception unit 34 adds a radio header in which a transmission procedure, a transmission destination station ID “SXX”, a transmission source vehicle ID “XXXX”, and the like are added to the frame stored in the frame storage unit 31. A frame is generated, and the generated radio frame is transmitted to the ground radio 40. The transmission / reception unit 34 has a plurality of channels for transmission / reception, and transmits a radio frame using the channel CH indicated by the channel instruction command. In the reception standby mode, the transmission / reception unit 34 scans with the two channel CHs set by the channel switching command, and receives the radio frame on the connected channel CH. When a radio frame is received from the ground radio 40 or another vehicle-mounted radio 30, the vehicle ID “XXXX” of the transmission destination described in the radio header is stored in the ID storage unit 33. Compared with “XXX”, if they match, the received radio frame is stored in the frame storage unit 31, and if they do not match, the received radio frame is discarded.

  The ground radio 40 is a low-power radio that transmits a radio frame using a specific low-power radio band that does not require a radio worker qualification or a radio station license if it is a radio facility that satisfies certain conditions defined by the Radio Law. As shown in FIG. 4, it has the same configuration as the in-vehicle wireless device 30. The ID storage unit 33 of the terrestrial wireless device 40 stores a station ID “SOO” that identifies the installed station 2.

  The ground device 50 is an information processing device such as a microcomputer including a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like, as shown in FIG. 51, a vehicle information notification unit 52, a route data storage unit 53, a vehicle registration notification generation unit 54, and a wireless I / F 55 that is an interface with the ground radio 40.

  The vehicle information storage unit 51 is a storage unit such as a semiconductor memory or an HDD (Hard Disk Drive), and based on the block notification received from the in-vehicle device 20, the vehicle ID of the vehicle 1 and the current position block (station block, station block) Are stored as vehicle information.

  The vehicle information notification unit 52 is a display device such as a liquid crystal display or a sound output device such as a speaker that notifies the user of vehicle information stored in the vehicle information storage unit 51 visually or by voice. Thereby, the user waiting at the station 2 can grasp the current position of the vehicle 1 scheduled to arrive, and the service to the user is improved.

  The route data storage unit 53 is a storage unit such as a semiconductor memory or an HDD (Hard Disk Drive), and stores route data similar to the route data storage unit 25 of the in-vehicle device 20.

  When the block notification is input via the wireless I / F 55, the vehicle registration notification generation unit 54 updates the vehicle information stored in the vehicle information storage unit 51 based on the input block notification. In addition, the vehicle registration notification generation unit 54 describes a command for setting the operation of the ground radio 40 using the vehicle 1 located in the own station area as a transmission destination, and vehicle information stored in the vehicle information storage unit 51. A frame including the serial message thus generated is generated as a vehicle registration notification, and the generated vehicle registration notification is output to the ground radio 40 via the wireless I / F 55.

Next, a block notification transmission operation using the in-vehicle wireless device 30 by the in-vehicle device 20 will be described in detail with reference to FIGS. 5 and 6.
Referring to FIG. 5, in the in-vehicle device 20, the positioning position receiving unit 22 monitors reception of the positioning position from the GPS receiver 10 (step A <b> 1), and the block notification generating unit 24 is connected to the ground device 50. The vehicle registration notification is received (step A2).

  When the positioning position is received in step A1, the travel position specifying unit 23 compares the received positioning position with the route data stored in the route data storage unit 25, so that the block in which the vehicle 1 is located. Is identified (step A3), and it is determined whether or not the vehicle 1 has entered a new block by comparing the identified block with the travel history stored in the travel history storage unit 26 (step A4). ).

  When it is determined in step A4 that the vehicle 1 has entered a new block, the traveling position specifying unit 23 outputs the specified block to the block notification generating unit 24 as the current position block. If it is determined in step A4 that the vehicle 1 has not entered the new block, the process returns to step A1 to monitor reception of the next positioning position.

  Next, the block notification generation unit 24, the current position block input from the travel position specifying unit 23, the route data stored in the route data storage unit 25, and the travel history stored in the travel history storage unit 26. Based on the above, the station 2 or the vehicle 1 located within a preset range from the current position block is specified as a transmission destination (step A5). The travel history is used to determine the traveling direction, and is used when the ranges set on the front side and the rear side in the traveling direction are different. Moreover, in this Embodiment, the two stations 2 located in the front side of the advancing direction and the two stations 2 located in the back side of the advancing direction are specified as a transmission destination. For example, as shown in FIG. 6, when the vehicle 1 with the vehicle ID “X04” enters the route block “R045”, the F station “S06”, which is the two stations 2 located on the front side in the traveling direction, The E station “S05” and the two stations 2 located on the rear side in the traveling direction, that is, the D station “S04” and the C station “S03” are specified as transmission destinations.

  Next, the block notification generation unit 24 generates a frame including a command for setting the operation of the in-vehicle wireless device 30 and a serial message in which the current position block is described for each transmission destination as a block notification (step A6). . Then, the block notification generator 24 outputs the generated block notification to the in-vehicle wireless device 30 via the wireless I / F 28, thereby transmitting the block notification by the in-vehicle wireless device 30 (step A7), and returns to step A1.

Next, the vehicle registration notification from the ground device 50 that monitors reception in step A2 will be described.
In the present embodiment, as described above, the two stations 2 located on the front side in the traveling direction and the two stations 2 located on the rear side in the traveling direction are specified as transmission destinations of the block notification. Therefore, the ground device 50 installed in the station 2 receives the block notification from the vehicle 1 located between the two stations ahead via the ground radio 40. When a block notification is input via the wireless I / F 55, the vehicle registration notification generation unit 54 of the ground device 50 updates the vehicle information stored in the vehicle information storage unit 51 based on the input block notification. . For example, the ground device 50 installed at the E station “S05” illustrated in FIG. 6 includes a vehicle ID “X03”, a vehicle ID “X04”, and a vehicle ID “X05” located between the two stations ahead. Block notification is transmitted from each vehicle 1, and the vehicle information storage unit 51 stores the current position blocks of the vehicle 1 with the vehicle ID “X03”, the vehicle ID “X04”, and the vehicle ID “X05” as “R039”, “ “R045” and “R053” are stored as vehicle information.

  In addition, when the current position block of the input block notification is the local station area, the vehicle registration notification generation unit 54 performs the operation of the terrestrial radio device 40 with the vehicle 1 that is the transmission source of the block notification as the transmission destination. A frame composed of a command to be set and a serial message describing the vehicle information stored in the vehicle information storage unit 51 is generated as a vehicle registration notification. Then, the vehicle registration notification generation unit 54 outputs the generated vehicle registration notification to the ground wireless device 40 via the wireless I / F 55, thereby causing the ground wireless device 40 to transmit the vehicle registration notification.

In step A2, when receiving the vehicle registration notification from the ground device 50, the block notification generation unit 24 monitors the reception based on the received vehicle registration notification, and sends the vehicle registration notification transmitted in this manner to the vehicle. The vehicle information stored in the information storage unit 27 is updated (step A8), and the process returns to step A1.
Thus, the vehicle information storage unit 27 stores the vehicle ID and the current position block of the vehicle 1 located within a predetermined range (between two stations before and after the traveling direction) as vehicle information.

Next, the block notification generation operation by the block notification generation unit 24 will be described in detail with reference to FIGS.
Referring to FIG. 7, when the transmission destination is specified in step A5 shown in FIG. 5, the block notification generation unit 24 sets the variable n to 1 (step B1), and the current position block input from the travel position specification unit 23. Based on the route data stored in the route data storage unit 25, the number of blocks R up to the nth transmission destination is calculated (step B2). Then, the block notification generation unit 24 determines whether or not the calculated block number R is less than a preset threshold block number Ra (step B3).

  When the block number R calculated in step B3 is less than the preset threshold block number Ra, the block notification generation unit 24 selects direct transmission for directly transmitting the block notification to the transmission destination, and performs direct transmission. Generate block notifications. For example, when “10 blocks” is set as the threshold block number Ra, the block number R from the vehicle 1 of the vehicle ID “X04” to the E station “S05” and the D station “S04” shown in FIG. They are “2 blocks” and “6 blocks”, respectively, and both are less than the threshold block number Ra. Thereby, transmission from the vehicle 1 with the vehicle ID “X04” shown in FIG. 6 to the E station “S05” and the D station “S04” is selected as direct transmission.

  In generating a block notification for direct transmission, first, the block notification generating unit 24 generates an answer instruction command corresponding to the calculated block number R (step B4). FIG. 8 shows a communication procedure for direct transmission. Note that the calling station and the called station shown in FIG. 8 are the in-vehicle wireless device 30 and the terrestrial wireless device 40, and the connected device is connected to the in-vehicle device 20 and the terrestrial wireless device 40 connected to the in-vehicle wireless device 30. Ground device 50. In the communication procedure shown in FIG. 8, the presence / absence of transmission (radio frame reception report “ACK” or operation report “answer”) indicated by a dotted arrow is selectable by an answer instruction command. That is, in the in-vehicle wireless device 30 and the terrestrial wireless device 40, the frame analysis unit 32 analyzes the frame stored in the frame storage unit 31, and based on the answer instruction command, receives the radio frame reception report “ACK” and the operation. It is determined whether or not to send a report “answer”.

In the present embodiment, the presence / absence of “Answer A”, “Answer B”, and “Answer C” shown in FIG. 8 is selected according to the calculated block number R by an answer instruction command. “Answer A” is an operation report notifying that the calling station has received the frame, and its reliability is low, but the amount of wireless communication does not increase. Therefore, when the number of blocks R is small (for example, 1 to 3 blocks), the block notification generation unit 24 generates an answer instruction command indicating that only “Answer A” is present.
“Answer B” is an operation report informing that the called station has received the frame, and has a medium reliability, but requires a reception report “ACK” from the called station to the calling station. Therefore, when the number of blocks R is medium (for example, 4 to 6 blocks), the block notification generation unit 24 generates an answer instruction command indicating that only “Answer B” exists.
“Answer C” is an operation report notifying that the called station has output a frame to the connected device connected by wire, and is highly reliable, but the reception report “answer” from the called station to the calling station is high. And a reception report “ACK” from the calling station to the called station is required. Therefore, when the number of blocks R is large (for example, 7 to 9 blocks), the block notification generation unit 24 generates an answer instruction command indicating “answer B”.

  Next, the block notification generation unit 24 identifies the channel CH set as the nth transmission destination based on the route data stored in the route data storage unit 25, and performs transmission on the identified channel CH. A channel instruction command for instructing the in-vehicle wireless device 30 is generated (step B5).

  Next, the block notification generating unit 24 transmits the transmission instruction command in which the vehicle ID of the transmission destination and the station ID of the transmission source are described, the answer instruction command generated in Step B4, and the channel instruction command generated in Step B5. And a serial message in which the current position block is described are generated as a block notification for direct transmission (step B6), and the generated block notification is output to the in-vehicle wireless device 30 (step B7). Accordingly, the in-vehicle wireless device 30 generates a wireless header based on the transmission instruction command, and transmits a wireless frame including the wireless header, the command, and the serial message to the transmission destination through the channel CH instructed by the channel instruction command. . Further, the reception report “ACK” and the operation report “answer” of the radio frame from the calling station or the called station are performed based on the answer instruction command.

  Next, the block notification generation unit 24 determines whether or not there is a remaining transmission destination that has not been transmitted (step B8), and if there is no remaining transmission destination in step B8, the block notification generation operation is performed. finish. If there is a remaining transmission destination in step B8, 1 is added to the variable n (step B9), the process returns to step B2, and the number of blocks R up to the next transmission destination is calculated.

  When the block number R calculated in step B3 is greater than or equal to the preset threshold block number Ra, the block notification generation unit 24 sends a block to the transmission destination via the other in-vehicle wireless device 30 or the terrestrial wireless device 40. A relay transmission for transmitting the notification is selected, and a block notification for relay transmission is generated. For example, when “10 blocks” is set as the threshold block number Ra, transmission from the vehicle 1 of the vehicle ID “X04” shown in FIG. 6 to the F station “S06” and the C station “S03” is relayed. Selected as.

  In generating the block notification for relay transmission, first, the block notification generation unit 24 is based on the route data stored in the route data storage unit 25 and the vehicle information stored in the vehicle information storage unit 27. The vehicle 1 and the station 2 located between the transmission destinations are specified as relay destinations (step B10). For example, when the block notification is transmitted from the vehicle 1 with the vehicle ID “X04” shown in FIG. 6 to the F station “S06”, it is located between the vehicle 1 with the vehicle ID “X04” and the F station “S06”. The E station “S05” and the vehicle 1 with the vehicle ID “X05” are identified as relay destinations. Note that it is not necessary to specify all the vehicles 1 and stations 2 located between the transmission destinations as relay destinations, and one or more relay destinations are selected from the vehicles 1 and stations 2 located between the transmission destinations. You may make it select suitably. Also, a limit may be set on the number of relay destinations.

  Next, the block notification generation unit 24 transmits the transmission destination vehicle ID, the transmission source station ID, the relay destination station ID and vehicle ID specified in step B10, and the relay order. An instruction command is generated (step B11).

  Next, the block notification generator 24 generates a relay answer instruction command (step B12). FIG. 9 shows a communication procedure for relay transmission. Note that the calling station, the relay station, and the called station shown in FIG. 9 are the in-vehicle wireless device 30 and the terrestrial wireless device 40, and the connected devices are the in-vehicle device 20 and the terrestrial wireless device connected to the in-vehicle wireless device 30. 40 is a ground device 50 connected to 40. In the relay answer instruction command, “answer C” having high reliability, which is an operation report notifying that the called station has output a frame to a connected device connected by wire, is set as being present. In the communication procedure shown in FIG. 9, the presence / absence of transmission (radio frame reception report “ACK” or operation report “answer”) indicated by a dotted arrow is configured to be selectable by an answer instruction command. Can do.

  Next, based on the route data stored in the route data storage unit 25, the block notification generation unit 24 identifies the channel CH set for the relay destination and the transmission destination, and the own device and the relay destination. A relay channel instruction command for designating a channel CH to be used between the relay destinations and between the relay destination and the transmission destination is generated (step B13).

  Next, the block notification generation unit 24 includes a relay transmission instruction command generated in step B11, a relay answer instruction command generated in step B12, and a relay channel instruction command generated in step B13. A frame composed of a serial message in which the current position block is described is generated as a relay block notification (step B14), and the process reaches step B7 to output the generated block notification to the in-vehicle wireless device 30. Accordingly, the in-vehicle wireless device 30 generates a wireless header based on the relay transmission instruction command, and relays a wireless frame including the wireless header, the command, and the serial message on the channel CH instructed by the relay channel instruction command. Send first.

  Next, operations of the in-vehicle wireless device 30 and the ground wireless device 40 will be described in detail with reference to FIG. The in-vehicle wireless device 30 and the terrestrial wireless device 40 have the same configuration and perform the same operation, and therefore, the in-vehicle wireless device 30 will be described below as a representative.

  The in-vehicle wireless device 30 is always set to a reception standby mode in which reception is awaited. The in-vehicle wireless device 30 is waiting for reception of a radio frame from the ground wireless device 40 or another in-vehicle wireless device 30 (step C1). The writing of the frame from the apparatus 20 to the frame storage unit 31 (step C2) and the writing of the channel switching command are monitored (step C3).

  When the transmission / reception unit 34 receives a radio frame from the ground radio 40 or other in-vehicle radio 30 in step C1, the vehicle ID stored in the ID storage unit 33 and the vehicle described as the destination in the radio header It is determined whether the wireless frame is addressed to the own device based on whether the IDs match (step C4). If it is determined in step C4 that the radio frame is not addressed to itself, the transmission / reception unit 34 discards the received radio frame (step C5), returns to step C1, and waits for the next reception.

  If it is determined in step C4 whether or not the wireless frame is addressed to the own device, a frame composed of a command and a serial message is written in the frame storage unit 31 in the received wireless frame (step C6). Next, the frame analysis unit 32 analyzes the frame stored in the frame storage unit 31 and determines whether the command is a relay command (step C7).

  If it is not a relay command in step C7, the frame analysis unit 32 outputs the serial message of the frame stored in the frame storage unit 31 to the in-vehicle device 20 (step C8), and returns to step A1. Note that the frame analysis unit 32, when instructed by the answer instruction command included in the frame stored in the frame storage unit 31, a reception report “ACK” that reports that the radio frame has been received, An operation report “answer” reporting that the serial message has been output to the in-vehicle device 20 is transmitted to the transmission source by the transmission / reception unit 34.

  If the command is a relay command in step C7, the frame analysis unit 32 specifies the channel CH to be transmitted based on the relay channel instruction command (step C9), and the next based on the relay transmission instruction command. A transmission destination (station ID “SXX” or vehicle ID “XXXX”) is specified (step C10), and the channel storage unit to the transmission destination specified in step C10 using the channel CH specified in step C9. The transmission of the frame stored in 31 is instructed (step C11).

  The transmission / reception unit 34 generates a radio header in which the destination specified in step C10 is described, and transmits a radio frame including the radio header, a command, and a serial message to the destination using the channel CH specified in step C9. (Step C12), the process returns to Step C1 and waits for the next reception. The frame analysis unit 32, when instructed by the relay answer instruction command included in the frame stored in the frame storage unit 31, receives a reception report “ACK” for reporting that the radio frame has been received. Is transmitted to the transmission source by the transmission / reception unit 34.

  When a frame is written from the in-vehicle device 20 to the frame storage unit 31 in step C2, the process goes to step C9, where the frame analysis unit 32 analyzes the frame stored in the frame storage unit 31 and analyzes the channel instruction command (or relay channel). The channel CH to be transmitted is specified based on the instruction command), and the transmission destination (station ID “SXX” or vehicle ID “XXXX”) is specified based on the transmission instruction command (or relay transmission instruction command). (Step C10), the channel CH specified in Step C13 is used to instruct the transmission of the frame stored in the frame storage unit 31 to the transmission destination specified in Step C14 (Step C11).

  The transmission / reception unit 34 generates a radio header in which the destination specified in step C10 is described, and transmits a radio frame including the radio header, a command, and a serial message to the destination using the channel CH specified in step C9. (Step C12), the process returns to Step C1 and waits for the next reception.

  When a channel switching command is written from the in-vehicle device 20 to the frame storage unit 31 in step C3, the frame analysis unit 32 analyzes the channel switching command stored in the frame storage unit 31 to identify two channels CH, and transmits and receives The reception channel of the unit 34 is set to the specified two channels CH (step C13), and the process returns to step C1 to wait for the next reception. As a result, in the reception standby mode, the transmission / reception unit 34 scans with the two channels CH set by the channel switching command, and receives a radio frame on the connected channel CH.

In this embodiment, the direct transmission and the relay transmission are selected based on the number of blocks R to the transmission destination. However, the distance to the transmission destination is calculated based on the route data, and the distance is determined according to the distance. Thus, direct transmission and relay transmission may be selected.
Further, in this embodiment, it is configured to select the presence / absence of each of “Answer A”, “Answer B”, and “Answer C” by an answer instruction command, but all the answers may be omitted, , “Answer A”, “Answer B”, and “Answer C” may be selectable.
Further, in the in-vehicle wireless device 30 and the terrestrial wireless device 40, the transmission output and the reception intensity may be configured to be switchable, and may be configured to be switchable by a command written in the frame storage unit 31. In this case, the transmission output and the reception intensity can be switched according to the distance to the transmission destination or the transmission source.

As described above, the present embodiment is a communication system that performs wireless communication between the in-vehicle wireless device 30 installed in the vehicle 1 traveling on the traveling route and the ground wireless device 40 installed on the ground. The in-vehicle wireless device 30 is a frame storage unit 31 in which a frame composed of a command and a message, which is input from the connected in-vehicle device 20 or received from another in-vehicle wireless device 30 or the ground wireless device 40, is written. A frame analysis unit 32 that analyzes the command of the frame stored in the frame storage unit 31, and a transmission / reception unit 34 that transmits the frame stored in the frame storage unit 31 by an operation based on the analysis result by the frame analysis unit 32. And.
With this configuration, the operation of the in-vehicle wireless device 30 can be controlled by a command written in the frame storage unit 31, so that it is not necessary to synchronize between the in-vehicle wireless device 30 and the ground wireless device 40, and a license is required. Therefore, it is possible to construct an inexpensive communication system using a specific low power radio.

Further, according to the present embodiment, the transmission / reception unit 34 has a plurality of transmission channels, and the frame analysis unit 32 analyzes a command input from the connected in-vehicle device 20 and written in the frame storage unit 31. Thus, the transmission destination and the transmission channel are specified, and the frame stored in the frame storage unit 31 is transmitted through the transmission channel specified as the transmission destination specified by the transmission / reception unit 34.
With this configuration, the transmission channel can be easily changed and interference can be prevented.

Further, according to the present embodiment, the transmission / reception unit 34 has a plurality of transmission channels, and the frame analysis unit 32 is received from the other in-vehicle wireless device 30 or the ground wireless device 40 and written in the frame storage unit 31. It is determined whether or not it is for relay by the received command, and if it is not for relay, the connected in-vehicle device 20 outputs the frame stored in the frame storage unit 31, and if it is for relay, By analyzing the command written in the frame storage unit 31, the transmission destination and the transmission channel are specified, and the frame stored in the frame storage unit 31 is transmitted using the transmission channel specified by the transmission destination specified by the transmission / reception unit 34. It is configured to let you.
With this configuration, the in-vehicle wireless device 30 and the terrestrial wireless device 40 can function as a relay station by a command written in the frame storage unit 31, and a flexible communication network in which the communication path is not fixed can be constructed. it can.

Further, according to the present embodiment, the transmission / reception unit 34 has a plurality of reception channels, and the frame analysis unit 32 analyzes a command input from the connected in-vehicle device 20 and written in the frame storage unit 31. Thus, the reception channel of the transmission / reception unit 34 is set.
With this configuration, the in-vehicle device 20 can be easily switched to the reception channel set in the station area at the current position.

  Note that the present invention is not limited to the above-described embodiments, and it is obvious that the embodiments can be appropriately changed within the scope of the technical idea of the present invention. In addition, the number, position, shape, and the like of the constituent members are not limited to the above-described embodiment, and can be set to a number, position, shape, and the like that are suitable for implementing the present invention. In each figure, the same numerals are given to the same component.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Station 10 GPS receiver 11 GPS antenna 20 In-vehicle apparatus 21 GPS I / F
22 Positioning position receiving unit 23 Traveling position specifying unit 24 Block notification generating unit 25 Route data storage unit 26 Traveling history storage unit 27 Vehicle information storage unit 28 Wireless I / F
30 On-vehicle wireless device 31 Frame storage unit 32 Frame analysis unit 33 ID storage unit 34 Transmission / reception unit 35 Antenna 40 Ground wireless device 50 Ground device 51 Vehicle information storage unit 52 Vehicle information notification unit 53 Route data storage unit 54 Vehicle registration notification generation unit 55 Wireless I / F

Claims (4)

A communication system for performing wireless communication between a radio installed in a vehicle traveling on a travel route and a radio installed on the ground,
The wireless device is a frame storage unit in which a frame composed of a command and a message, which is input from a connected device connected or received from another wireless device, is written;
Frame analysis means for analyzing the command of the frame stored in the frame storage means;
A transmission / reception means for transmitting the frame stored in the frame storage means in an operation based on the analysis result by the frame analysis means ;
The transmitting / receiving means has a plurality of transmission channels,
The frame analysis unit identifies a transmission destination and a transmission channel by analyzing the command input from a connected device connected and written in the frame storage unit, and identifies the transmission specified by the identified transmission destination. communication system characterized in Rukoto to transmit the frame stored in the frame memory unit in the channel by said transceiver means. Before SL frame analysis means is received from another wireless device, it is determined whether the relay by written the command to the frame memory unit, if not the relay is connected to the connection device said frame store means to output the stored said frame, in the case of the relay, by analyzing the command written in the frame memory means to identify a transmission channel and a destination, specific communication system according to claim 1, characterized in that to transmit the stored said frame in said frame memory means with the specified transmit channels to said destination by said transmitting and receiving means and. The transmitting / receiving means has a plurality of receiving channels,
The frame analyzing unit is input from the connected connection device, the frame is written to parse the command that the storage means, according to claim 1 or 2, characterized in that setting the reception channel of the receiving means The communication system described.   The radio installed on the ground is installed at each station where the vehicle stops, and two different reception channels are allocated to the radio installed at the adjacent station,
  The radio set installed in the vehicle is set to two reception channels assigned to the radio set installed in any one of the stations by the frame analysis means. Communications system.

Images