JP2006333336A - Data communication method, data communication system, road-side apparatus and mobile unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To more smoothly perform switching from a narrow-area radio communication system to a wide-area radio data communication system. <P>SOLUTION: In a communication system where a narrow-area radio communication system using a plurality of mobile units 3 and road-side apparatuses 4 performing data communication within a fixed communication area 6 coexists with a wide-area radio communication system 7 using a plurality of base stations 9 performing communication within a wider communication area 8, it is determined according to contents of communication between a mobile unit 3 and a road-side apparatus 4 of the narrow-area radio communication system whether or not the relevant mobile unit 3 comprises a communication function of the wide-area radio communication system 7 and if it is determined that the mobile unit 3 comprises the communication function, notification information that a base station 9 of the wide-area radio communication system transmits to the mobile unit 3 is transmitted form the road-side apparatus 4 of the narrow-area radio communication system to the relevant mobile unit 3. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention provides a data communication technique that efficiently realizes a communication method that enables an expansion of a communication range in a narrow-range communication (DSRC: Dedicated Short Range Communication) in which a radio wave irradiation area is limited to a very narrow range. It is about.

  Currently, a system for non-stop automatic toll collection (ETC) on a toll road is in operation. In the narrow area communication developed as a communication method of this ETC system, it is data transmission only in a spot individual communication area that is required such as a toll booth, the communication time is extremely limited, and a large amount of information is sent. I could not do it.

In view of such a point, in Patent Document 1, a wide area wireless communication system such as a portable wireless communication system is arranged so as to overlay the narrow area wireless communication system, and the control network and the wide area wireless communication of the narrow area wireless communication system are arranged. When a packet that could not be sent in a narrow-area wireless communication system is generated after the system is connected to the control network of the system, control is performed by sending the packet again in the wide-area wireless communication system. Trying to solve the problem. However, when trying to send a packet in a wide area wireless communication system after a certain packet has not been reached, that is, when a timeout occurs, the operation of switching the communication system is performed.
JP 2002-152112 A

  In the conventional technology, in a communication system that combines a narrow-area wireless communication system (wireless data communication means) with a limited communication range such as DSRC and a wide-area wireless communication system (wide-area wireless data communication means) such as a cellular system, When switching the communication channel from the wireless communication means with limited range to the wide area wireless data communication means, after waiting for the timeout of one communication means, the connection to the other communication means is performed, so the communication of Inconveniences such as inability to switch at high speed.

  The present invention has been made in consideration of the above circumstances, and in a communication system that combines a narrow-area wireless communication system with a limited communication range such as DSRC and a wide-area wireless communication system such as a cellular system, An object of the present invention is to provide a data communication technique that can perform a switching operation more smoothly when a communication channel is switched from a narrow-area wireless communication system having a limited communication range to a wide-area wireless communication system.

  In order to solve the above-mentioned problem, the first invention is a narrow-area wireless communication system using a plurality of roadside devices that perform data communication with a mobile device within a certain area, and communication in a wider area than the roadside apparatus. In a communication system in which a wide area wireless communication system using a plurality of base stations coexists, the mobile apparatus has a communication function of the wide area wireless communication system according to the communication content between the mobile apparatus and the roadside device of the narrow area wireless communication system. If it is determined whether the communication function is provided, the broadcast information transmitted from the base station of the wide area wireless communication system to the mobile device is transmitted to the narrow area wireless communication system. A data communication method is provided in which transmission is performed from the roadside device to the mobile device.

  According to a second aspect of the present invention, in the data communication method according to the first aspect of the present invention, information for registering the position of the mobile unit in the wide area radio communication system is transmitted from the mobile unit to the roadside apparatus by the narrow range radio communication system. A data communication method is provided, wherein the location registration information is transmitted from the narrow-area radio communication system to the wide-area radio communication system, and the location of the mobile device is registered in the wide-area radio communication system To do.

  According to a third aspect of the present invention, in the data communication method according to the first or second aspect of the present invention, information for a mobile device to make a call to the wide area wireless communication system is further transmitted by the narrow area wireless communication system. To the roadside device, the call information is transmitted from the narrow area radio communication system to the wide area radio communication system, and the call information is transmitted from the base station of the wide area radio communication system to the mobile unit. A data communication method is provided, characterized by transmitting response information with respect to.

  A fourth invention is a narrow-area wireless communication system that uses a plurality of roadside devices that perform data communication with a mobile device within a certain area, and a wide-area wireless communication that uses a plurality of base stations that communicate in a wider area than the roadside apparatus. In the communication system coexisting with the system, it is determined whether or not the mobile device has a communication function of the wide area wireless communication system according to the communication content between the mobile device and the roadside device of the narrow area wireless communication system, When it is determined that the communication function is provided, the broadcast information transmitted from the base station of the wide area wireless communication system to the mobile device is transmitted from the roadside device of the narrow area wireless communication system to the mobile device. The present invention provides a data communication system characterized by transmitting data to.

  A fifth invention provides a narrow area wireless communication system that uses a plurality of roadside devices that perform data communication with a mobile device within a certain area, and a wide area wireless communication that uses a plurality of base stations that perform communication in a wider area than the roadside apparatus. In the communication system coexisting with the system, it is determined whether or not the mobile device has the communication function of the wide area wireless communication system according to the communication content with the mobile device by the narrow area wireless communication system, and the communication function is When it is determined that the information is provided, the broadcast information transmitted from the base station of the wide area wireless communication system to the mobile device is transmitted to the mobile device by the narrow area wireless communication system. A roadside device is provided.

  A sixth invention provides a narrow area wireless communication system that uses a plurality of roadside devices that perform data communication with a mobile device within a certain area, and a wide area wireless communication that uses a plurality of base stations that perform communication in a wider area than the roadside apparatus. In a communication system coexisting with a system, information indicating that the mobile unit has a communication function of a wide area wireless communication system is transmitted to a roadside device of the narrow area wireless communication system, Provided is a mobile device characterized in that broadcast information transmitted from a station to a mobile device is received from a roadside device of a narrow area wireless communication system.

  A seventh invention is a mobile device according to the sixth invention, characterized in that information on an uplink communication channel relating to location registration of a wide area wireless communication system is transmitted on a narrow area wireless communication channel. provide.

  According to an eighth aspect of the present invention, in the mobile unit according to the sixth or seventh aspect of the present invention, a message relating to a call operation of a wide area radio communication system is exchanged over a narrow area radio communication channel. Provide a machine.

  According to the above configuration, the broadcast information can be acquired, the position registration operation, and the call operation in the wide area wireless communication system can be performed during the data communication by the narrow area wireless communication system, so that the communication range is limited. The switching operation from the wireless communication system to the wide area wireless communication system can be performed more smoothly.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a data communication system according to an embodiment of the present invention. In this system, a plurality of DSCR roadside devices 4 are spot-installed on a mobile device 3 that is attached to or mounted on a moving means 2 such as an automobile that moves on a road 1. A plurality of communication areas 6 of a wireless communication system (DSRC system) 5 are provided.

  The mobile unit 3 is a wireless communication terminal having both a data transmission / reception function for the narrow-area wireless communication system 5 and a data transmission / reception function for the wide-area wireless data communication system 7. Both functions may be realized in one communication terminal device, or may be realized by connecting each one communication terminal device for each function with a predetermined connection means. May be.

  On the other hand, the communication area 8 of the wide area wireless data communication system 7 is set so as to include the area 6 of the narrow area wireless communication system 5 arranged in a spot manner. As an example of the wide area wireless data communication system 7, a TDD-TDMA (Time Division Duplex-Time Division Multiple Access) system such as PHS (registered trademark: Personal Handyphone System) may be used, or a PDC (Personal Cell Digit). FDD-TDMA (Frequency Division Duplex-Time division Multiples), and Global System for Mobile Communications (GPRS), General Division Radio Services (GPRS) May be a ultiple Access) system, HRPD (High Rate Packet Data) system or HSDPA (High Speed Downlink Packet A

  In the present embodiment, the mobile device 3 starts communication with the narrow-band wireless system 5 first. The communication time with the narrow area wireless communication system 5 is limited in consideration of the fact that the mobile unit 3 is moving, the communication area 6 of the narrow area wireless communication system 5 is limited, and the above two points. It is assumed that In the present embodiment, after the communication of the narrow-area wireless communication system 5 is established, the data necessary for communication with the wide-area wireless data communication system 7, that is, the notification message is received via the narrow-area wireless communication system 5. ing. When the wireless communication channel is switched from the narrow area wireless communication system 5 to the wide area wireless data communication system 7, information of the notification message acquired in advance by the narrow area wireless communication system 5 is used. .

  In the wide area wireless data communication system 7, since a plurality of base stations 9 are operating at the same time, in order to synchronize with the wide area wireless data communication system 7, after receiving a lot of broadcast information, a location registration operation, a call It is necessary to perform an action. These communications are usually performed via a common control channel. The communication speed of the common control channel of the wide area wireless data communication system 7 is kept low so that communication can be established even in the mobile unit 3 away from the base station 9. For example, the communication speed of the common control channel is 9.6 kbps even in a CDMA2000 (registered trademark) system or an HRPD system capable of uplink data communication at a maximum of 153 kbps. For this reason, it takes a very long time to establish communication. On the other hand, as a feature of the narrow-area wireless communication system 5, although it is a limited communication range, it provides data communication at a higher speed than the common control channel of the wide-area wireless data communication system 7. For this reason, wide area wireless data communication can be established more quickly by providing control in which the narrow-area wireless communication system 5 sends a higher-layer message sent on the common control channel instead.

  In FIG. 1, the mobile unit 3 has a function of transmitting and receiving radio waves in a certain area, and the DSCR roadside unit 4 transmits and receives data to and from the mobile unit 3 located in the communication area 6. The narrow-area wireless communication system 5 includes a plurality of DSCR roadside devices 4 and a DSCR control device 10 that controls the plurality of DSCR roadside devices 4. The DSCR control device 10 has a function of controlling a plurality of DSCR roadside devices 4 and performing data communication with other devices via the network 11. On the other hand, the wide area wireless data communication system 7 includes a plurality of base stations 9, a plurality of wide area wireless data communication base station apparatuses 12 that are control apparatuses for the base station 9, and a control apparatus for the plurality of wide area wireless data communication base station apparatuses 12. And a wide area wireless data communication centralized control device 13. The narrow area wireless communication system 5 and the wide area wireless data communication system 7 are connected via a network 11 configured by a predetermined communication method such as optical communication or high speed data communication. Both communication systems are allowed to coexist in a region where the two overlap.

  FIG. 2 is a flowchart showing a control procedure in the embodiment of FIG. In the communication system of FIG. 1, the mobile device 3 and the roadside device 4 start communication in a narrow area radio (DSRC) system (step S11). Next, it is determined whether the mobile unit 3 has a wide area wireless data communication function (step S12). When the mobile device 3 has a wide area wireless data communication function, the DSCR roadside device 4 is connected to the area 8 where the DSCR roadside device 4 of the wide area wireless data communication system 7 exists via the control device 10 of the narrow area communication system 5. The notification message transmitted by the base station 9 is obtained (step S13). The flow of the notification message from the base station 9 to the DSCR roadside device 4 is, for example, the base station 9 → the wide area wireless data communication base station apparatus 12 → the wide area wireless data communication central control apparatus 13 → the network 11 → the DSCR control apparatus 10 → the DSCR roadside. It becomes machine 4.

  Next, the DSCR roadside device 4 encapsulates (packets) and transmits the notification message transmitted from the wide area wireless data communication system base station 9 in the area 8 to the mobile device 3 (step S14). ). The mobile device 3 receives the notification message of the wide area wireless data communication system base station 9 in the area 8 from the roadside device 4 (step S15). The process ends here.

  On the other hand, if it is determined in step S12 that the mobile device 3 does not have the wide area wireless data communication function, the process ends there.

  Through the above processing, the mobile device 3 can receive the notification message transmitted by the base station 9 of the wide area wireless data communication system 7 during the data communication by the narrow area wireless communication system 5. By using this notification message, the switching operation from the communication channel for the narrow area wireless communication system 5 to the communication channel for the wide area wireless data communication system 7 can be performed smoothly.

  FIG. 3 is a flowchart showing another example of the control procedure in the embodiment of FIG. In the example shown in FIG. 3, the uplink communication channel information related to the location registration of the wide area wireless data communication system 7 is transmitted from the mobile unit 3 to the communication channel of the narrow area wireless communication system 5 from the mobile unit 3 in the control procedure of FIG. 2. A procedure to send has been added. In FIG. 3, the same processes as those in FIG.

  The mobile unit 3 receives a notification message from the wide area wireless data communication system base station 9 in the area 8 from the roadside device 4 by the procedure described with reference to FIG. 2 (steps S11 to S15). Next, it is determined whether the mobile unit 3 performs location registration for the location registration function of the wide area wireless data communication system 7 (step S21). When performing location registration, the mobile device 3 packetizes a location registration message for the wide area wireless data communication system 7 (step S22). This location registration message includes information on the uplink communication channel related to location registration of the wide area radio communication system 7.

  Next, the mobile device 3 transmits the packetized location registration message in the narrow area wireless communication system 5 (step S23). The DSRC roadside device 4 and the control device 10 send the location registration message packet sent from the mobile device 3 to the wide area wireless data communication centralized control device 13 of the wide area wireless data communication system 7 (step S24). Here, the position registration operation of the mobile device 3 is completed (step S25).

  On the other hand, if it is determined in step S12 that the mobile device 3 does not have the wide area wireless data communication function, or if it is determined in step S21 that the mobile device 3 does not perform location registration, the process ends.

  Through the above processing, the mobile device 3 can receive the notification message transmitted from the base station 9 of the wide area wireless data communication system 7 during the data communication by the narrow area wireless communication system 5, and can further receive the wide area wireless data. Location registration for the communication system 7 can be performed. Since the notification message can be acquired in advance and location registration can be performed in advance, the switching operation from the communication channel for the narrow-area wireless communication system 5 to the communication channel for the wide-area wireless data communication system 7 can be performed smoothly. It becomes possible.

  FIG. 4 is a flowchart showing still another example of the control procedure in the embodiment of FIG. In the example shown in FIG. 4, a procedure for exchanging messages related to the call operation of the wide area radio communication system 7 performed by the mobile unit 3 in the communication channel of the narrow area radio communication system 5 in the control procedure of FIG. Has been added. In FIG. 4, the same processes as those in FIGS.

  The mobile unit 3 receives a notification message from the wide area wireless data communication system base station 9 in the area 8 from the roadside device 4 by the procedure described with reference to FIG. 2 (steps S11 to S15). The mobile unit 3 also performs location registration for the wide area wireless data communication system 7 in the area 8 according to the procedure described with reference to FIG. 3 (steps S21 to S25). Next, it is determined whether the mobile device 3 makes a call to the call function of the wide area wireless data communication system 7 (step S31).

  When making a call, the mobile device 3 packetizes an origination message for the wide area wireless data communication system 7 (step S32). Next, the mobile device 3 transmits the packetized origination message in the narrow area wireless communication system 5 (step S33). Next, the DSRC roadside device 4 and the control device 10 send the origination message packet sent from the mobile device 3 to the wide area wireless data communication centralized control device 13 of the wide area wireless data communication system 7 (step S34). The wide area wireless data communication centralized control device 13 returns a response of the origination message to the mobile unit 3 via the base station 9 that accommodates the mobile unit 3 (step S35). The process ends here.

  On the other hand, if it is determined in step S12 that the mobile device 3 does not have the wide area wireless data communication function, if it is determined in step S21 that the mobile device 3 does not perform location registration, or if the mobile device 3 is determined in step S31. If it is determined that the machine 3 does not place a call, the process ends.

  Through the above processing, the mobile unit 3 can receive the notification message transmitted by the base station 9 of the wide area wireless data communication system 7 during the data communication by the narrow area wireless communication system 5, and can perform the wide area wireless data communication. The location registration for the system 7 can be performed, and further, the exchange of messages related to the calling operation of the wide area wireless communication system 7 performed by the mobile unit 3 can be performed on the communication channel of the narrow area wireless communication system 5. Therefore, since a notification message can be acquired in advance, location registration can be performed in advance, and messages related to a call operation can be exchanged in advance, so that a wide area wireless communication can be performed from the communication channel for the narrow area wireless communication system 5. The switching operation to the communication channel for the data communication system 7 can be performed smoothly.

  FIG. 5 is a diagram showing an example of the configuration of the mobile device 3 of FIG. The mobile unit 3 shown in FIG. 5 includes a radio part 31 in charge of a narrow-area radio communication system function, a radio part 32 in charge of a wide-area radio data communication system function, a switching processing unit 33, and upper application data / upper layer processing unit. 34. The radio part 31 in charge of the narrowband radio communication system functions includes a baseband processing unit 311, a transmission system signal processing unit 312, a transmission system RF (Radio Frequency) block 313, a transmission / reception switch (duplexer) 314, an antenna 315, and a reception system. An RF block 316 and a reception system signal processing unit 317 are included. The wireless part 32 in charge of the wide area wireless data communication system function includes a baseband processing unit 321, a transmission system signal processing unit 322, a transmission system RF block 323, a transmission / reception switch 324, an antenna 325, a reception system RF block 326, and a reception system. The signal processing unit 327 is configured.

  In FIG. 5, a wireless part 31 responsible for the narrow-area wireless communication system function provides a wireless communication function for the narrow-area wireless communication system 5, and a wireless part 32 responsible for the wide-area wireless data communication system function is the wide-area wireless data communication system 7. Provide wireless communication function. The baseband processing unit 311 or the baseband processing unit 321 is a signal that is input from the switching processing unit 33 or output to the switching processing unit 33, and demodulates the signal before being modulated into a radio frequency band signal. To process the signal obtained. The transmission system signal processing unit 312 or the transmission system signal processing unit 322 inputs the transmission signal processed by the baseband processing unit 311 or the baseband processing unit 321, and transmits the signal to the transmission system RF block 313 or the transmission system RF block 323. Output. The transmission system RF block 313 or the transmission system RF block 323 modulates an input signal into a signal of a transmission frequency band, and transmits the signal from the antenna 315 or the antenna 325 via the duplexer 314 or the duplexer 324.

  The reception system RF block 316 or the reception system RF block 326 demodulates a signal received by the antenna 315 or the antenna 325 input via the duplexer 314 or the duplexer 324, and outputs a demodulated reception signal. The reception system signal processing unit 317 or the reception system signal processing unit 327 outputs the reception signal input from the reception system RF block 316 or the reception system RF block 326 to the baseband processing unit 311 or the baseband processing unit 321. The processing result is output to the baseband processing unit 311 or the baseband processing unit 321.

  The switching processing unit 33 supplies the signal supplied from the upper application data / upper layer processing unit 34 to either the baseband processing unit 311 or the baseband processing unit 321, or the baseband processing unit 311 or the baseband processing unit The signal output from 321 is output to the upper application data / upper layer processing unit 34. The upper application data / upper layer processing unit 34 inputs and outputs signals through the switching processing unit 33 and exchanges information with the upper application and the upper layer.

  With the above configuration, the mobile device 3 realizes a communication function between the narrow area wireless communication system and the wide area wireless data communication system. For example, when a non-delivery of a packet occurs in one communication system, communication is continued by switching the communication system. Moreover, in this system, the signal broadcast on the communication channel of the narrow area wireless communication system is set so as to include broadcast information of the wide area wireless data communication system. Then, when switching from a narrow-area wireless communication system to a wide-area wireless data communication system at the time of switching the wireless system, the mobile unit 3 can receive the information from the roadside device 4. By doing so, it is possible to significantly reduce the switching time between radio systems.

  In the configuration of FIG. 5, in the upper application data / upper layer processing unit 34, for example, a signal transmitted from an upper application or an upper layer is used as a signal for a narrow area radio communication system, or a wide area radio data communication system. Whether the signal is to be used for transmission or to be transmitted after being distributed to both, and processing corresponding to that is performed. Therefore, for example, the baseband processing unit 311 or the baseband processing unit 321 does not need to perform signal processing in consideration of exchanges with higher layers.

  FIG. 6 is another system diagram showing a configuration example of the communication system of the present invention. In FIG. 6, components corresponding to those in FIG. 6, the configuration corresponding to the DSCR control device 10 of FIG. 1 includes a narrow-area wireless communication system network 101, a network control device 102, an AP (application) server 103, a gateway 104, a plurality of zone control devices 105, and a plurality of wide areas. This is a radio notification information interrogator 106. The configuration corresponding to the wide area wireless data communication central control apparatus 13 of FIG. 1 includes a wide area wireless communication system network 131, a PDSN (Packet Data Serving Node) 132, a base station apparatus central station 133, a location registration management server 134, and a gateway 135. is there. Each configuration includes a single hardware, a combination of hardware and software, or a single software.

  The network control device 102 controls communication between each device connected to the own device or the narrow-area wireless communication system network 101. The AP server 103 is a device that performs processing in the application layer. The gateway 104 is connected to the gateway 135 via a predetermined communication line (communication network) (corresponding to the network 11 in FIG. 1), and transmits information bidirectionally. Each zone control device 105 controls each of a plurality of DSRC roadside units 4 arranged in a certain range. The wide area wireless system broadcast information interrogation unit 106 transmits broadcast area broadcast information (cell) of a wide area wireless data communication system including a narrow area communication area (zone) via the gateway 104 to the wide area wireless data communication base station apparatus (base). (Station control device) 12 is provided.

  The PDSN 132 terminates a PPP (Point-to-Point Protocol) session by a communication function and provides a function of routing data to a packet data network to which the communication function is to be connected. The base station apparatus centralized station 133 performs centralized control of a plurality of wide area wireless data communication base station apparatuses 12. The location registration management server 134 registers and manages location information of each mobile unit 3.

  In the above configuration, the wide area wireless system broadcast information interrogation unit 106 sends a transmission request for broadcast information in the communication area of the wide area wireless data communication system including the narrow area communication area to the AP server 103 via the zone controller 105. Issued against. The AP server 103 converts the received notification information transmission request into a predetermined format, and transmits the request to the PSDN 132 via the gateway 104 and the gateway 135. Based on the received information, the PSDN 132 makes an inquiry for broadcast information to the base station 9 whose communication area is the control range of the zone control device 105. The broadcast information returned from the base station 9 is transmitted from the DSRC roadside device 4 via the PSDN 132, the gateway 135 and the gateway 104, the AP server 103, and the zone control device 105.

  FIG. 7 is a diagram illustrating a configuration example of a data frame flowing in the mobile device 3-DSRC roadside device 4-network 11 described with reference to FIGS. In this example, the first five octets of the application layer data are used as data for this embodiment. The first one octet of the five octets is used as an identification code, and the types such as narrowband wireless broadcast, narrowband wireless unicast, wideband wireless broadcast, wideband wireless unicast, etc. are displayed. The next 4 octets are used as headers to display different information depending on the contents of the identification code. For example, in the case of narrow area radio broadcast, the transmission destination group is displayed in 2 octets of the header 4 octets. In the case of unicast, a transmission destination identification code is displayed in the header 4 octets. In the case of wide area radio broadcast, the system identifier of the transmission source is displayed in the first 1 octet of the header 4 octets, and the transmission destination group is displayed in the next 2 octets. In the system identifier of the transmission source, information indicating the method of the wide area wireless data communication system is displayed.

  As described above, according to the present embodiment, the communication range is limited in a communication system that combines a narrow-area wireless communication system with a limited communication range such as DSRC and a wide-area wireless communication system such as a cellular system. When a communication channel is switched from a narrow-area wireless communication system to a wide-area wireless communication system, information acquisition and location registration of the wide-area wireless communication system is performed during communication with a narrow-area wireless communication system with a limited communication range. Since it did in this way, the switching operation from the narrow area radio communication system with a limited communication range to the wide area radio communication system can be performed more smoothly.

  The embodiment of the present invention has been described in detail above, but the specific configuration is not limited to this embodiment, and includes design changes and the like within a scope not departing from the gist of the present invention. For example, when constructing each processing unit in a mobile device, it is common to implement a function of each processing unit by incorporating a predetermined program into a baseband processor incorporating a CPU. It is an item that can be arbitrarily selected by design to execute the program in a distributed manner not only in the baseband processor but also in a local CPU such as a DSP (Digital Signal Processor). Further, the above-described program can be recorded and distributed on a computer-readable recording medium, and may be distributed in a form that realizes a part of the functions. For example, it may be distributed in the form of application software using basic functions provided by an OS (operation system). Further, it is possible to adopt a form in which a predetermined function can be realized in combination with a program of an existing system already recorded in a computer system, that is, a so-called differential program.

  The computer-readable recording medium includes a storage device such as a hard disk and other nonvolatile storage devices in addition to a storage medium such as a portable magnetic disk and a magneto-optical disk. Furthermore, the form provided from another computer system via arbitrary transmission media, such as the internet and other networks, may be sufficient. In this case, the “computer-readable recording medium” includes a medium that holds a program for a certain period of time in a transmission medium such as a volatile memory inside a computer system serving as a host or client on a network.

  In the above description, the control unit is constructed by a distributed processing method using the main CPU or the local CPU. However, at least a part of the processor is constructed by a hardware circuit such as an FPGA (Field Programmable Gate Array). Is possible. The distribution of circuit program information to be incorporated into the FPGA can take various forms in the same manner as the distribution of the program.

It is the figure which showed the structure of one Embodiment of the communication system of this invention. It is the flowchart which showed the procedure of control in embodiment of FIG. It is the flowchart which showed the procedure of the other control in embodiment of FIG. 7 is a flowchart showing still another control procedure in the embodiment of FIG. 1. It is the figure which showed the structural example of the mobile body apparatus 3 of FIG. It is the figure which showed the other structural example of the communication system of this invention. It is a figure of the data frame which flows in the mobile body 3-roadside machine 4-network 11 in embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 2 ... Mobile means 3 ... Mobile machine 4 ... DSRC roadside machine 5 ... Narrow-area wireless communication system 6 ... Communication area 7 ... Wide area wireless data communication system 8 ... Communication area 9 ... Base station 11 ... Network 106 ... Wide area wireless system broadcast information Question section

Claims (8)

Communication in which a narrow area wireless communication system that uses a plurality of roadside devices that perform data communication with a mobile device within a certain area and a wide area wireless communication system that uses a plurality of base stations that communicate in a wider area than the roadside apparatus coexist In the system,
In accordance with the communication content between the mobile unit and the roadside device of the narrow area wireless communication system, determine whether the mobile unit has a communication function of the wide area wireless communication system,
When it is determined that the communication function is provided, the broadcast information transmitted from the base station of the wide area wireless communication system to the mobile device is transmitted from the roadside device of the narrow area wireless communication system to the mobile device. A data communication method characterized by transmitting to the other. further,
Information for registering the position of the mobile unit in the wide area radio communication system is transmitted from the mobile unit to the roadside device by the narrow range radio communication system,
The location registration information is transmitted from the narrow area wireless communication system to the wide area wireless communication system,
The data communication method according to claim 1, wherein the location of the mobile device is registered in a wide area wireless communication system. further,
Information for a mobile unit to make a call to a wide area wireless communication system is transmitted from the mobile unit to a roadside device by a narrow area wireless communication system,
The call information is transmitted from the narrow area radio communication system to the wide area radio communication system,
The data communication method according to claim 1 or 2, wherein response information for the call information is transmitted from a base station of a wide area radio communication system to the mobile device. Communication in which a narrow area wireless communication system that uses a plurality of roadside devices that perform data communication with a mobile device within a certain area and a wide area wireless communication system that uses a plurality of base stations that communicate in a wider area than the roadside apparatus coexist In the system,
In accordance with the communication content between the mobile unit and the roadside device of the narrow area wireless communication system, determine whether the mobile unit has a communication function of the wide area wireless communication system,
When it is determined that the communication function is provided, the broadcast information transmitted from the base station of the wide area wireless communication system to the mobile device is transmitted from the roadside device of the narrow area wireless communication system to the mobile device. A data communication system characterized by transmitting to the data. Communication in which a narrow area wireless communication system that uses a plurality of roadside devices that perform data communication with a mobile device within a certain area and a wide area wireless communication system that uses a plurality of base stations that communicate in a wider area than the roadside apparatus coexist In the system,
Determining whether the mobile device has a communication function of the wide area wireless communication system according to the communication content with the mobile device by the narrow area wireless communication system,
When it is determined that the communication function is provided, the broadcast information transmitted from the base station of the wide area wireless communication system to the mobile device is transmitted to the mobile device by the narrow area wireless communication system. A roadside device characterized by that. Communication in which a narrow area wireless communication system that uses a plurality of roadside devices that perform data communication with a mobile device within a certain area and a wide area wireless communication system that uses a plurality of base stations that communicate in a wider area than the roadside apparatus coexist In the system,
Sending information indicating that the mobile unit has a communication function of the wide area wireless communication system to the roadside device of the narrow area wireless communication system,
A mobile device characterized in that broadcast information transmitted from a base station of a wide area wireless communication system to a mobile device is received from a roadside device of the narrow area wireless communication system.   The mobile unit according to claim 6, wherein information on an uplink communication channel related to location registration of a wide area radio communication system is transmitted through a narrow area radio communication channel. The mobile device according to claim 6 or 7, wherein exchange of messages related to a call operation of a wide area wireless communication system is performed through a narrow area wireless communication channel.

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