JP2012118767A - Information distribution system and traffic signal control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technique capable of enhancing fast response and certainty in acquisition of information concerning an emergency vehicle while suppressing an introduction cost of a system.SOLUTION: An information distribution system comprises: a first wireless device 1 installed in an emergency vehicle 1a; a second wireless device 2 installed in other vehicles 2a; a plurality of base station wireless device 3; and a control station control device 4. The control station control device 4 determines a traveling route which the emergency vehicle 1a has to take based on a position of the emergency vehicle 1a and its destination. The base station wireless device 3 corresponding to the traveling route transmits information concerning the emergency vehicle 1a to the second wireless device 2 in a communication area of the base station wireless device 3 by control of the control station control device 4.

Description

  The present invention relates to an information distribution system and a traffic light control system that help an emergency vehicle travel toward a destination point.

  Conventionally, when an emergency vehicle such as an ambulance or patrol car (patrol car) travels to a destination, the emergency vehicle notifies the surrounding vehicles by emitting a sound or light such as a siren. is doing. However, when the surrounding vehicle is closed and music is being played, or when the surrounding vehicle is driving on a road with poor visibility, the driver of the surrounding vehicle recognizes until the emergency vehicle becomes visible. It cannot be done and the response may be delayed.

  In order to solve this problem, Patent Document 1 discloses a VICS-compatible VICS (Vehicle Information and Communication System) broadcaster that broadcasts information that an emergency vehicle is approaching. A technique for mounting a car navigation device on a surrounding vehicle is disclosed. Information from the VICS is received by a vehicle-mounted device such as a car navigation device, and is displayed as characters or figures. Therefore, according to this technology, by sending and receiving information using VISC, it is possible to prompt the surrounding vehicle to slow down and pass to another road, and it is possible to promptly arrive and transport an emergency vehicle. . VICS is a service provided by the Road Traffic Information Communication System Center. Information collected, processed, and edited by the center (for example, traffic jam / running regulation information, time information required for traveling in specific sections, accidents) Or construction information) is transmitted by communication / broadcast media (for example, radio waves, light, FM multiplex broadcasting, and terrestrial digital radio).

  Patent Document 2 discloses a technique for detecting the approach of an emergency vehicle using a notification means by direct communication between the emergency vehicle and a surrounding vehicle. Specifically, the radio wave detection device mounted on the surrounding vehicle analyzes the direction and angle of the radio wave emitted from the emergency vehicle according to the pattern based on the relative position to detect the emergency vehicle. This technology also makes it possible to encourage the surrounding vehicle to slow down and pass to another road.

JP 2000-172988 A JP 2001-134894 A

  In the technology disclosed in Patent Document 1, VICS is used, but when information provided by VICS is managed in units of prefectures and the emergency vehicle exceeds the boundary, information on the emergency vehicle is received in the surrounding vehicles. May not be possible. In addition, VICS distributes information that allows a certain amount of delay in distribution, such as information on traffic jams and accidents, and is therefore not suitable for distributing emergency vehicle information. In addition, there is a concern that the cost of introducing a system will be high when developing and constructing the addition of new services to the VICS infrastructure provided by corporations.

  On the other hand, in the technique of Patent Document 2, in an actual environment, environmental factors including radio wave interference and the like are uncertain, and analysis patterns are very diverse, so lack of responsiveness and certainty. In addition, it is possible to detect an emergency vehicle only after approaching a distance where radio waves reach, and practical use is considered difficult.

  Therefore, the present invention has been made in view of the above-described problems, and provides a technique capable of suppressing the introduction cost of the system and improving the responsiveness and certainty in acquiring information on emergency vehicles. The purpose is to do.

  An information distribution system according to the present invention includes a first wireless device mounted on an emergency vehicle, a second wireless device mounted on a vehicle other than the emergency vehicle, and wireless communication with the first and second wireless devices. A plurality of base station radio apparatuses that perform the above and a control station control apparatus that controls the plurality of base station radio apparatuses. When the control station control device acquires the position of the emergency vehicle and the destination point that the emergency vehicle should reach from the first radio device via the base station radio device, the position and the destination point The travel route on which the emergency vehicle should travel is determined based on the above. The base station radio apparatus corresponding to the travel route transmits information on the emergency vehicle to the second radio apparatus in the communication area of the own apparatus under the control of the control station control apparatus.

  As another configuration, the information distribution system according to the present invention, a first radio device mounted on an emergency vehicle, a second radio device mounted on a vehicle other than the emergency vehicle, the first and A plurality of base station radio apparatuses that perform radio communication with the second radio apparatus and perform radio communication with each other. When at least one of the plurality of base station wireless devices acquires the position of the emergency vehicle and the destination point to which the emergency vehicle should reach from the first wireless device, the base station wireless device is based on the position and the destination point. A travel route on which the emergency vehicle should travel is determined. The base station radio device corresponding to the travel route transmits information on the emergency vehicle to the second radio device in the communication area of the own device.

  According to the present invention, since the existing wireless communication system is partially changed and the existing wireless communication system is used, the introduction cost of the system can be suppressed. In addition, since it is not necessary to use an analysis pattern such as radio wave interference, it is possible to improve responsiveness and certainty in acquiring information related to an emergency vehicle.

It is a figure which shows the structure of the information delivery system which concerns on Embodiment 1. FIG. It is a figure which shows the structure of MM which the emergency vehicle which concerns on Embodiment 1 transmits. It is a figure which shows the structure of MM which the emergency vehicle which concerns on Embodiment 1 transmits. It is a figure which shows the structure of MM which the emergency vehicle which concerns on Embodiment 1 transmits. It is a figure which shows the service start sequence which concerns on Embodiment 1. FIG. It is a figure which shows the service start sequence which concerns on Embodiment 1. FIG. It is a figure which shows the service start sequence which concerns on Embodiment 1. FIG. It is a figure which shows the service start sequence which concerns on Embodiment 1. FIG. 3 is a flowchart showing a service flow according to the first embodiment. 3 is a flowchart showing a service flow according to the first embodiment. It is a figure which shows the structure of the information delivery system which concerns on Embodiment 2. FIG. FIG. 10 is a diagram illustrating a configuration of an information distribution system according to a third embodiment. It is a figure which shows the main communication functions which a disaster prevention radio system has. It is a figure which shows the structure of a disaster prevention radio | wireless system. It is a figure which shows the definition of the main stations which comprise a disaster prevention radio system. It is a figure which shows the flame | frame structure in a disaster prevention radio | wireless system. It is a figure which shows the flame | frame structure in a disaster prevention radio | wireless system. It is a figure which shows the classification | category of a functional channel. It is a figure which shows the definition of a function channel. It is a figure which shows the correspondence of a physical channel and a functional channel. It is a figure which shows the condition of channel utilization. It is a figure which shows the example of channel use in base station communication. It is a figure which shows the example of channel use in base station communication. It is a figure which shows the example of channel use in base station communication. It is a figure which shows an example of the relationship between the carrier of a base station, and the number of mobile stations. 3 is a diagram illustrating a structure of layer 3. FIG. It is a figure which shows the signal format of a layer 3.

<Embodiment 1>
First, before describing the information distribution system according to Embodiment 1 of the present invention, a disaster prevention radio system that is an existing infrastructure used by the system will be described. FIG. 13 is a diagram showing the main communication functions of the disaster prevention radio system, FIG. 14 is a diagram showing the configuration of the disaster prevention radio system, and FIG. 15 shows the definitions of main stations constituting the disaster prevention radio system. FIG.

  This disaster prevention radio system handles communication control layers of layer 1 (physical layer), layer 2 (data link layer), and layer 3 (network layer). Hereinafter, Layer 1 to Layer 3 will be described in detail.

<Layer 1 (physical layer)>
In layer 1, services are provided to layer 2 and the management entity, and services provided from layer 2 and the management entity are used.

  FIG. 16 is a diagram illustrating a frame configuration of a downlink frame (TDM) and an uplink frame (TDMA) in the disaster prevention radio system. Wireless communication is performed by TDM that transmits a radio signal of a downlink frame from the base station to the mobile station and TDMA that transmits a radio signal of the uplink frame from the mobile station to the base station. One or a plurality of radio carriers (radio signal frequencies) are assigned to the system according to the scale. On each radio carrier assigned to the system, a section on the time axis that defines the minimum communication unit is called a slot, and a slot repetition period on a radio carrier composed of an integer number of slots is called a frame.

  The slot is assigned to each user in the system according to the communication link setting, and a “common use slot” that can be commonly used (accessed) by all users in the system for communication control such as communication link setting. There is an “individually assigned slot” that can be used only by assigned users. Note that a radio carrier including a common use slot is called a control carrier, and one or more radio carriers that can be used as a control carrier can be assigned to each system. On the other hand, a radio carrier composed only of individual allocation slots is called a communication carrier, and the remaining radio carriers excluding the control carrier can be allocated.

  In the frame configuration shown in FIG. 16, since the number of multiplexing on one radio carrier is 4, the basic frame length is 4 slots (40 ms). The upstream frame and the downstream frame form a pair, and the time delay (20 ms) of the downstream frame with respect to the upstream frame is called a frame offset. Conversely, the time delay (20 ms) of the upstream frame with respect to the downstream frame is called a transmission / reception offset. The transmission / reception offset is given by (frame length)-(frame offset) and subtraction.

  FIG. 17 is a diagram illustrating a frame configuration example. As shown in FIG. 17, a super frame is defined in units of 18 frame lengths (18 times the frame length). One frame period is 40 ms (4-slot configuration), and one superframe period is 720 ms (18-frame configuration).

  A frame defines a multiplexing structure of radio channels. In principle, a radio channel is constituted by a set of slots at the same position in each frame. The radio channel can be classified into a “control physical channel” configured by a common use slot and a “communication physical channel” configured by an individual allocation slot at the same position. The control physical channel and the communication physical channel exist independently for each slot and may be mixed in one carrier as shown in FIG.

  A plurality of types of functional channels (CCH) are arranged in the physical channel (a general term for a control physical channel and a communication physical channel). 18 is a diagram showing the classification of functional channels, FIG. 19 is a diagram showing the definition of each functional channel, and FIG. 20 is a diagram showing the correspondence between physical channels and functional channels.

  As shown in FIG. 18, functional channels (CCH) can be broadly classified into CAC (common access channel) and USC (user dedicated channel). The CAC can be divided into BCCH, CCCH (PCH, SCCH), and UPCH, and the USC can be divided into TCH, ACCH (FACCH, SACCH), RCH, and SB.

  As shown in FIG. 20, for example, functional channels BCCH, PCH, and SCCH are arranged in the downlink control physical channel, and these functional channels are arranged at predetermined positions in the superframe. On the other hand, SCCH is allocated to all uplink control physical channels. Note that the UPCH can be allocated to either the uplink control physical channel or the downlink control physical channel. In the communication physical channel, the bits in each slot are allocated to SACCH / RCH and TCH / FACCH, and the functional channel is configured.

  FIG. 21 is a diagram illustrating a channel usage situation for a two-wave base station carrier. Here, four channels are allocated per base station carrier wave. Of the four channels of the first wave, one channel is a control physical channel, and all the four channels can be used as a communication channel after the second wave transmitted simultaneously at a frequency different from that of the first wave. In this case, the relationship between the number of base station carriers and the number of call channels is expressed by the following equation (1). For example, when the base station carrier has two waves, the maximum number of channels that can be used for a call is seven.

  Next, a communication path of the disaster prevention wireless system will be described. There are two communication paths for this system: “base station communication” via a base station and “direct communication between mobile stations” where mobile stations communicate directly with each other without going through the base station. Since the system according to the present embodiment is based on the former, that is, “base station communication”, three examples of channel usage in the base station communication will be described below.

  FIG. 22 is a diagram illustrating an example in which a control station that controls a base station and a mobile station communicate with each other via the base station. In this example, the base station includes the information to be given to the mobile station A received from the control station in the channel 1 of the frequency F1 and transmits the information to the mobile station A, and the information to be given to the mobile station B received from the control station. It is included in channel 2 of frequency F1 and transmitted to mobile station B. The mobile station A acquires information from the channel 1 of the frequency F1, and includes information to be transmitted to the control station in the channel 1 of the frequency f1 and transmits the information to the base station. The mobile station B acquires information from the channel 2 of the frequency F1, and includes information to be transmitted to the control station in the channel 2 of the frequency f1 and transmits the information to the base station. The base station gives information contained in channels 1 and 2 of frequency f1 to the control station. The communication shown in FIG. 22 as described above is a duplex method, and the maximum number of simultaneous calls is equal to the number of call channels obtained by the above equation (1), and a maximum of 7 calls can be made here.

  FIG. 23 is a diagram illustrating an example in which mobile stations perform one-to-one communication via a base station. In this example, the mobile station A includes information to be given to the mobile station B in the channel 1 of the frequency f1 and transmits it to the base station. The mobile station B includes information to be given to the mobile station A in the channel 2 of the frequency f1 and transmits it to the base station. The base station acquires information from channel 1 of frequency f1, and transmits the information to mobile station B by including the information in channel 2 of frequency F1. The base station acquires information from the channel 2 of the radio signal having the frequency f1, and transmits the information to the mobile station A by including the information in the channel 1 having the frequency F1. The mobile stations A and B respectively acquire information included in the channels 1 and 2 having the frequency F1. The communication shown in FIG. 23 as described above includes a duplex method and a simplex method. In the case of the duplex method, a bidirectional simultaneous call similar to that of a cellular phone is possible. However, the maximum number of simultaneous calls can be calculated by using the number of call channels (Tn) obtained by the above equation (1) as follows: 2), and a maximum of 3 calls can be made here.

  FIG. 24 is a diagram illustrating an example in which mobile stations perform communication alternately with each other via a base station and perform 1-to-n communication by dedicated communication or group communication. In this example, communication is performed similarly to the communication described with reference to FIG. However, this communication is a simplex system based on press talk, and there is one channel per call as in the simplex system between the control station and the mobile station and the simplex system between the mobile stations via the base station. Since it becomes necessary, the maximum number of simultaneous calls is equal to the number of call channels (Tn) obtained by the above-described equation (1), and a maximum of 7 calls can be made here.

  In the disaster prevention radio system configured as described above, the frequency (carrier) of a radio signal that can be used by one base station is defined by the sum of the number of mobile stations and the number of terminal stations that subscribe to the one base station. Yes. FIG. 25 shows an example of the relationship between the base station carriers and the number of mobile stations defined by the Radio Law related examination criteria.

<Layer 2 (data link layer)>
In layer 2, the link access procedure LAPDM (Link Access Procedure for Digital Mobile Channel) for realizing data transmission between nodes is defined using the bit string transmission function of layer 1. The purpose of LAPDM is to transfer information between layer 3 entities over a radio section interface in a public mobile digital communication system by means of a functional channel (CCH).

  In the operation of the data link layer, two operations, a non-confirmation type and a confirmation type, are defined as layer 3 information transfer methods, and these operations can coexist on one CCH. BCCH and PCH provide only unacknowledged operation, and SCCH, SACCH, FACCH and UPCH provide both operations. Next, the unconfirmed operation and the confirmed operation will be described in detail.

  First, the unconfirmed operation will be described. In unacknowledged operation, layer 3 information is transmitted in an unnumbered information (UI) frame in which delivery confirmation is not performed. Even if an error is detected in each of transmission and format, no error recovery mechanism is set. Also, the flow control procedure (control mechanism) is not defined. Such an unconfirmed operation is used, for example, for single data transmission. The unconfirmed operation can be applied not only to information transfer between one point and one point, but also to information transfer between one point and a plurality of points (information transfer in broadcast format). That is, the UI frame can be sent to a specific endpoint, or can be sent to a plurality of endpoints corresponding to a specific service access point identifier (SAPI).

  Next, the confirmation type operation will be described. In acknowledged operation, layer 3 information is transferred in an information (I) frame that is acknowledged at the data link layer. If delivery is not confirmed, error recovery is performed by retransmitting a frame corresponding to the fact that delivery has not been performed. Errors that cannot be recovered by the data link layer are notified to the management entity. A flow control procedure is also defined. Such a confirmation type operation is used to perform reliable data transmission, for example. The confirmation operation can be applied only to information transfer between one point and one point. Acknowledgment operations are defined only in multi-frame operations. The multi-frame operation is started by a multi-frame setting procedure using an extended asynchronous balanced mode setting (SABME) command for setting the extended asynchronous balanced mode or an extended asynchronous balanced mode with information (SABMEI) command.

<Layer 3 (network layer)>
Layer 3 defines procedures for setting, maintaining, switching, disconnecting, restoring, and registering the location of a mobile station in a wireless interface in a prefectural / municipal digital mobile communication system. These procedures are applied with respect to messages exchanged via CAC and USC shown in FIG. 18, and are intended to define the characteristics, procedures and messages required for radio management, mobility management and call control. That is, the procedure defined in the layer 3 is for controlling the circuit switching connection.

  The layer 3 procedure uses layer 2 functions and services, requests layer 2 services using primitives defined in layer 2, and receives information from layer 2 and the like. These primitives are used to indicate communication between protocol layers, but do not define an implementation.

  Next, the definition of layer 3 will be described. In layer 3, radio management (RT: Radio Frequency Transmission Management), mobility management (MM: Mobility Management), and call control (CC: Call Control) are defined. The RT has a function related to radio resource management. This function includes functions such as wireless zone selection, wireless line setting, maintenance, switching, and disconnection. The MM has a function related to mobility support of a mobile station. This function includes location registration. The CC has a function related to line call connection control. This function includes call setup, maintenance and release functions.

  FIG. 26 is a diagram illustrating the structure of layer 3. RT, MM, and CC are configured independently, but considering the efficiency of signal transmission and reception, a signal in which RT, MM, and CC are multiplexed is transmitted on the interface in the wireless section. On the other hand, a sharing mechanism that separates received multiplexed signals into RT, MM, and CC is defined. Each layer 3 entity of RT, MM, and CC communicates with the data link layer via a sharing mechanism.

  FIG. 27 is a diagram illustrating a layer 3 signal format. The carpool display section includes information necessary for the signal receiving side to separate the RT, MM, and CC signals. Each layer 3 signal field appears in the order of RT-MM-CC, and for a signal field with no carpooling, the fields are packed and sent in one or two layer 2 frames. Sharing allows each of RT, MM, and CC to be sent in a layer 2 frame, but two or more layer 3 signals of the same function (eg, two RT signals) cannot be sent together.

<Information distribution system>
Now, the information distribution system according to the present embodiment uses the existing infrastructure of the disaster prevention radio system described above, so that information on emergency vehicles such as ambulances and police cars (for example, from which direction the emergency vehicle is directed to which direction). It is possible to quickly and accurately notify the vehicle around the travel route of the emergency vehicle. Hereinafter, such an information distribution system will be described.

  FIG. 1 is a diagram showing a configuration of an information distribution system according to the present embodiment. As shown in FIG. 1, a first radio device 1 mounted on an emergency vehicle 1a, a second radio device 2 mounted on a vehicle 2a other than the emergency vehicle 1a, a plurality of base station radio devices 3, And a control station control device 4. Each of the first and second radio apparatuses 1 and 2 functions as a mobile station (car-mounted radio apparatus) of the above-described disaster prevention radio system, and each of the plurality of base station radio apparatuses 3 includes the above-described disaster prevention radio. Functions as a base station (relay station) of the system.

  The emergency vehicle 1a is provided with a destination acquisition unit (not shown) for acquiring a destination point (for example, a hospital) to which the emergency vehicle 1a should reach, and an emergency detection unit (not shown) for validating an emergency situation. It has been. For example, an operation unit that receives an input operation of the emergency vehicle 1a corresponds to the destination acquisition unit and the emergency detection unit. The emergency vehicle 1a is equipped with a position acquisition unit (not shown) that acquires the position of the emergency vehicle 1a. The position acquisition unit corresponds to, for example, the above-described operation unit or GPS (Global Positioning System). In the present embodiment, the first radio apparatus 1 mounted on the emergency vehicle 1a includes an SCCH telegram including the position of the emergency vehicle 1a and the destination point to which the emergency vehicle 1a should reach in the above-described layer 3 MM. Transmit to a plurality of base station radio apparatuses 3.

  FIG. 2 is a diagram illustrating a configuration of the MM according to the present embodiment. As shown in FIG. 2, the MM is composed of a message type having one octet and an information element group field having a plurality of octets.

  FIG. 3 is a diagram showing message types of MM, and FIG. 4 is a diagram showing information element group fields of MM. As shown in FIG. 3, the message type is a message specified by a combination of 8-bit “0” and “1”. For example, “0, 0, 1, 0, 0, 0, 1, In the case of “0”, the message “location registration acceptance” is specified.

  As shown in FIG. 4, the information element group field includes the registration number contents that specify the information element length (octet number) of the field, and an odd / number indicating whether the number of digits of the number digits is even or odd. It consists of an even number display, a number type, and a number digit. In the present embodiment, the position of the emergency vehicle 1a and the destination point that the emergency vehicle 1a should reach are assigned in digital form in the number digits. More specifically, the first radio apparatus 1 includes a plurality of base station radio apparatuses 3 including the position of the emergency vehicle 1a acquired by the position acquisition unit and the destination point acquired by the destination point acquisition unit in the MM. Send to.

  Returning to FIG. 1, the plurality of base station radio apparatuses 3 perform radio communication with the first radio apparatus 1 and the second radio apparatus 2 using radio signals having a frequency of 260 MHz, for example. In the present embodiment, some of the plurality of base station wireless devices 3 communicate with each other via the ground infrastructure 7 between the other base station wireless devices 3 and the control station control device 4, and the plurality of base station wireless devices 3 Some of the devices 3 communicate with other base station wireless devices 3 via wireless communication. The plurality of base station wireless devices 3 configured as described above, via the ground infrastructure 7, indicate the position and destination point of the emergency vehicle 1 a included in the SCCH telegram transmitted from the first wireless device 1 of the emergency vehicle 1 a. It can be given to the control station control device 4. In the present embodiment, one or more base station radio apparatuses 3 are grouped in a unit of group 5, and a larger number of base station radio apparatuses 3 are grouped in a unit of area 6. .

  The control station control device 4 controls a plurality of base station radio devices 3. In addition, the control station control device 4 obtains the position of the emergency vehicle 1a and the destination point that the emergency vehicle 1a should reach from the first radio device 1 via the base station radio device 3 on the map. The travel route on which the emergency vehicle 1a should travel is determined based on the position and the destination point. And the control station control apparatus 4 is notified so that the base station radio | wireless apparatus 3 which has a communication area on the determined said driving | running route may notify the information regarding the emergency vehicle 1a toward the 2nd radio | wireless apparatus 2 in the communication area. A plurality of base station radio apparatuses 3 are controlled. That is, the base station radio apparatus 3 corresponding to the determined travel route notifies the second radio apparatus 2 in the communication area of the own apparatus of the information related to the emergency vehicle 1a under the control of the control station control apparatus 4.

  In the present embodiment, the control station control device 4 transmits the broadcast communication message shown in FIG. 13 to the first base station radio device 3 that can be directly controlled (hereinafter referred to as “first base station radio device 3a”). Give instructions to create and send The top base station radio apparatus 3a that has received the instruction to create / send a broadcast message creates a broadcast message. Thereafter, the head base station radio apparatus 3a determines whether there is another base station radio apparatus 3 capable of communicating via the ground infrastructure 7 or radio under the area 6 and group 5 to which the own base station belongs. When it is determined that there is another base station wireless device 3 capable of communicating via the ground infrastructure 7, the head base station wireless device 3a relays a simultaneous communication message to the other base station wireless device 3. Instructions are given. When it is determined that there is another base station radio apparatus 3 capable of communicating via radio, the head communication base station radio apparatus 3a relays a simultaneous communication message to the other base station radio apparatus 3 Instructions are given.

  Such creation / instruction of a simultaneous communication message is sequentially performed in each base station radio apparatus 3 under the area 6 / group 7 of the leading base station radio apparatus 3a. If it is determined that there is no other base station wireless device 3 that can communicate via the ground infrastructure 7 or wireless communication, the rear base station wireless device 3 (hereinafter referred to as “rear base station wireless”) that has performed the determination. Device 3b) repeatedly transmits the notification information to the second wireless device 2 in the communication area of the own device via wireless communication. And the tail base station radio | wireless apparatus 3b which transmitted alerting | reporting information fixed number of times relays the information regarding the emergency vehicle 1a (For example, the direction where the emergency vehicle 1a drive | works) to the 2nd radio | wireless apparatus 2 in the communication area of an own apparatus. In the present embodiment, it is assumed that tail base station radio apparatus 3b is provided along the road.

  The vehicle 2 a on which the second wireless device 2 is mounted includes a car navigation device 2 b that displays information on the emergency vehicle 1 a notified to the second wireless device 2. The car navigation device 2b may be a device integrated with the second wireless device 2, or may be a separate device from the second wireless device 2. The second radio apparatus 2 that has received the above-described broadcast information then receives another signal from the tail base station radio apparatus 3b that has transmitted the broadcast information and performs radio communication with the tail base station radio apparatus 3b. Switch to the frequency. And when the 2nd radio | wireless apparatus 2 receives the information regarding the emergency vehicle 1a by the simultaneous communication message | telegram transmitted by the said frequency from the tail base station radio | wireless apparatus 3b, the car navigation apparatus 2b of the vehicle 2a Information about the emergency vehicle 1a is displayed.

<Service start sequence>
5 and 6 are diagrams showing a service start sequence of the information distribution system according to the present embodiment. Hereinafter, the service start sequence will be described with reference to these drawings.

  In steps S1 and S2, the first radio apparatus 1 of the emergency vehicle 1a performs a notification sequence for notifying the control station control apparatus 4 of an emergency via the plurality of base station radio apparatuses 3.

  Specifically, in step S1, the first radio apparatus 1 transmits a UI telegram to an unspecified base station radio apparatus 3 when an emergency situation occurs. The base station wireless device 3 (hereinafter referred to as “base station wireless device 3c”) that has received the UI message notifies the first wireless device 1 of its own information (area, frequency, etc.) using the UI message. . The first wireless device 1 that has received the notification from the base station wireless device 3c performs frequency switching for performing wireless communication with the base station wireless device 3c based on the frequency information included in the notification.

  In step S2, the first radio apparatus 1 notifies the base station radio apparatus 3c of an SCCH request message including the location and the destination point of the emergency vehicle 1a in the MM, and the base station radio apparatus 3c The SCCH request message is transferred to the control station controller 4 via 7 or the like. Thereafter, the control station control device 4 notifies the base station radio device 3c of the SCCH response message via the ground infrastructure 7 or the like, and the base station radio device 3c notifies the first radio device 1 of the SCCH response message.

  In step S3, the control station control device 4 determines a travel route based on the location and destination point of the emergency vehicle 1a included in the SCCH request message from the base station radio device 3c, and determines the location and travel of the emergency vehicle 1a. Route information is registered in conjunction with the GPS system. The control station control device 4 then, based on information obtained from the GPS system, a plurality of rear base station radio devices 3b having communication areas on the travel route (hereinafter referred to as “plural travel route peripheral devices 3d”). Is identified. That is, the control station control device 4 specifies a plurality of travel route peripheral devices 3d that include a communication area on the travel route.

  In step S4, the control station control device 4 transmits the notification information to the second wireless device 2 of the vehicle 2a existing around the travel route via the plurality of travel route peripheral devices 3d specified in step S3. Perform a sequence. Specifically, the control station control device 4 notifies the notification information to the plurality of travel route peripheral devices 3d. Receiving the notification from the control station control device 4, each travel route peripheral device 3 d transfers the notification information to the second wireless device 2 existing in each communication area. The notification of notification information from the travel route peripheral device 3d to the second wireless device 2 is repeated until the travel route peripheral device 3d receives a service stop notification from the control station control device 4.

  In step S5 shown in FIG. 6, the control station control device 4 notifies the plurality of travel route peripheral devices 3d that simultaneous communication is performed. Receiving the notification from the control station control device 4, each travel route peripheral device 3 d notifies the second wireless device 2 existing in each communication area in advance that simultaneous communication is performed. This notification is performed a certain number of times.

  In step S6, the control station control device 4 causes the second wireless device 2 of the vehicle 2a existing around the travel route to perform frequency switching via the plurality of travel route peripheral devices 3d. Specifically, the control station control device 4 transmits a synchronization burst (SB) to a plurality of travel route peripheral devices 3d, and each travel route peripheral device 3d that has received the synchronization burst from the control station control device 4 Is transferred to the second radio apparatus 2 existing in each communication area by simultaneous communication. Then, the second wireless device 2 that has received the synchronization burst performs frequency switching for performing wireless communication with the corresponding travel route peripheral device 3d based on the frequency information included therein. The simultaneous communication is repeated a certain number of times or is repeated until the control station control device 4 determines that the service is stopped.

  In step S7, the control station control device 4 gives information related to the emergency vehicle 1a to the second wireless device 2 of the vehicle 2a existing around the travel route via the plurality of travel route peripheral devices 3d. Specifically, the control station control device 4 transmits information related to the emergency vehicle 1a to the plurality of travel route peripheral devices 3d, and each travel route peripheral device 3d receiving the information related to the emergency vehicle 1a The information regarding the emergency vehicle 1a is transferred to the second wireless device 2 existing in The simultaneous communication is repeated a certain number of times or is repeated until the control station control device 4 determines that the service is stopped. Further, the control station control device 4 transmits information indicating that the emergency of the emergency vehicle 1a has been canceled (hereinafter referred to as “emergency release information”) to the travel route peripheral device 3d having the communication area through which the emergency vehicle 1a has passed. To do.

<Service termination sequence>
7 and 8 are diagrams showing a service end sequence of the information distribution system according to the present embodiment. Hereinafter, the service end sequence will be described with reference to these drawings.

  In steps S11 and S12, the first radio apparatus 1 of the emergency vehicle 1a performs a notification sequence for notifying the control station control apparatus 4 of service stop via the plurality of base station radio apparatuses 3.

  Specifically, in step S11, the first radio apparatus 1 transmits a UI telegram to an unspecified base station radio apparatus 3 when the destination point is reached. The base station radio apparatus 3 (hereinafter referred to as “base station radio apparatus 3e”) that has received the UI telegram notifies the first radio apparatus 1 of its own information (area, frequency, etc.) using the UI telegram. . The first wireless device 1 that has received the notification from the base station wireless device 3e performs frequency switching for performing wireless communication with the base station wireless device 3e based on the frequency information included in the notification.

  In step S12, the first radio apparatus 1 notifies the control station control apparatus 4 via the base station radio apparatus 3e of an SCCH request message including only the position of the emergency vehicle 1a in the MM. Thereafter, the control station control device 4 notifies the first wireless device 1 of the SCCH response message via the base station wireless device 3e.

  In step S13, the control station control device 4 deletes the information registered in conjunction with the GPS system based on the position of the emergency vehicle 1a included in the SCCH request message from the base station radio device 3e.

  In step S14, the control station control device 4 notifies the plurality of travel route peripheral devices 3d specified in step S3 that simultaneous communication is performed. Receiving the notification from the control station control device 4, each travel route peripheral device 3 d notifies the second wireless device 2 existing in each communication area in advance that simultaneous communication is performed. This notification is performed a certain number of times.

  In step S15 shown in FIG. 8, the control station control device 4 causes the second wireless device 2 of the vehicle 2a existing around the travel route to perform frequency switching via the plurality of travel route peripheral devices 3d. Specifically, the control station control device 4 transmits a synchronization burst to a plurality of travel route peripheral devices 3d, and each travel route peripheral device 3d that receives the synchronization burst from the control station control device 4 Are transferred to the second wireless device 2 existing at the same time by simultaneous communication. Then, the second wireless device 2 that has received the synchronization burst performs frequency switching for performing wireless communication with the corresponding travel route peripheral device 3d based on the frequency information included therein. Note that simultaneous communication is performed a certain number of times.

  In step S16, the control station control device 4 gives emergency release information of the emergency vehicle 1a to the second wireless device 2 of the vehicle 2a existing around the travel route via the plurality of travel route peripheral devices 3d. Specifically, the control station control device 4 transmits emergency release information to the plurality of travel route peripheral devices 3d, and each travel route peripheral device 3d that has received the emergency release information has a first one existing in each communication area. 2 The emergency release information is transferred to the wireless device 2 by simultaneous communication. Note that simultaneous communication is performed a certain number of times.

  In step S <b> 17, the control station control device 4 transmits a service stop notification to the base station wireless device 3.

<Service flow>
FIG. 9 and FIG. 10 are flowcharts showing a procedure in which the information distribution system according to the present embodiment performs operations of the above-described service start sequence and service end sequence. Hereinafter, the service operation will be described with reference to these drawings. In the following description, step numbers in the above-described service start sequence and service end sequence are appropriately assigned.

  In step S21, the emergency vehicle 1a detects an emergency situation.

  In step S22, the emergency vehicle 1a periodically checks whether there is a change in the detected emergency situation. If the situation has changed, the process proceeds to step S23, and if not, the confirmation operation is repeated.

  In step S23, the emergency vehicle 1a determines whether or not it is necessary to notify the control station control device 4 of the contents of the situation change confirmed in step S22. If it is determined that notification is necessary, the process proceeds to step S24. If not, the process returns to step S22 to perform a confirmation operation.

  In step S24, the emergency vehicle 1a determines whether the content of the situation change confirmed in step S22 is the end of the emergency (for example, when the emergency vehicle 1a reaches the destination or the service ends) It is determined whether a situation has occurred or has changed (for example, change of destination point). If it is determined that the emergency has ended, the process proceeds to step S25. If it is determined that an emergency has occurred or changed, the process proceeds to step S26.

  In step S25, the first radio apparatus 1 creates an SCCH request message including only the position of the emergency vehicle 1a, and notifies the control station control apparatus 4 of the SCCH request message via the plurality of base station radio apparatuses 3. (Step S12). Thereafter, the process proceeds to step S46.

  In step S26, the first radio apparatus 1 creates an SCCH request message including the position of the emergency vehicle 1a and the destination point. In step S27, the first radio apparatus 1 performs frequency switching for performing radio communication with the unspecified base station radio apparatus 3 using the UI telegram (step S1). In step S28, the first radio apparatus 1 notifies the control station control apparatus 4 via the plurality of base station radio apparatuses 3 including the SCCH request message created in step S26 in the radio signal having the frequency after switching. To do. In step S29, when the control station control device 4 receives the SCCH request message, the control station control device 4 notifies the first radio device 1 of the SCCH response message via the plurality of base station radio devices 3 (step S2).

  In step S30, the control station control device 4 determines a travel route based on the location and the destination point of the emergency vehicle 1a included in the SCCH request message, and uses the GPS system to determine the location and travel route information of the emergency vehicle 1a. Register in conjunction with. Thereafter, the process proceeds to step S41.

  In step S41 shown in FIG. 10, the control station control device 4 identifies a plurality of travel route peripheral devices 3d based on information obtained from the GPS system (step S3).

  In step S42, the control station control device 4 transmits notification information to the second wireless device 2 of the vehicle 2a existing around the travel route of the emergency vehicle 1a via the plurality of travel route peripheral devices 3d (step S42). Along with S4), notification of simultaneous communication is made in advance (step S5). In step S43, the traveling route peripheral device 3d switches the frequency of the second wireless device 2 so that the traveling route peripheral device 3d and the second wireless device 2 can be wirelessly connected (step S6). In step 44, the control station control device 4 transfers information related to the emergency vehicle 1a to the second wireless device 2 through simultaneous communication via the plurality of travel route peripheral devices 3d (step S7).

  In step S45, when the second wireless device 2 receives the information related to the emergency vehicle 1a, the car navigation device 2b of the vehicle 2a equipped with the second wireless device 2 displays the information related to the emergency vehicle 1a. .

  In step S46, the control station control device 4 determines whether an SCCH request message including only the position (SCCH request message according to step S25) has been received. If it is determined that the SCCH request message has been received, the process proceeds to step S47, and if not, the process returns to step 41. Thus, since the control station control apparatus 4 repeats steps S41-S45 until it receives the SCCH request | requirement message which concerns on step S25, the above-mentioned several driving | running route periphery apparatus 3d will be updated at any time. .

  In step S47, the operations from steps S13 to S17 described in the service end sequence are performed, and the service ends.

  The information distribution system according to the present embodiment as described above is a partial modification of the existing wireless communication system and uses the existing wireless communication system, and therefore suppresses the introduction cost of the system. Can do. Further, since it is not necessary to use an analysis pattern such as radio wave interference as in the technique disclosed in Patent Document 2, it is possible to improve the responsiveness and certainty in acquiring information related to the emergency vehicle 1a. In addition, even if the emergency vehicle 1a exceeds the border of a prefecture or the like, it can be expected that the vehicle 2a can acquire information related to the emergency vehicle 1a. In addition, since the base station wireless device 3 can be installed in accordance with a problem specific to each region (a crowded area or a place where radio waves do not reach), a flexible service can be provided.

  In the information distribution system according to the present embodiment, the vehicle 2a includes a car navigation device 2b. In general, a car navigation device can provide a driver with a variety of information such as DVDs and application entertainment information. Therefore, by using a car navigation device in combination with an existing wireless communication system, the service described above can be used. It is also expected that it will be possible to build highly reliable services customized to local problems. In addition, it can be expected that another service will be constructed by cooperating with intelligent road information systems such as VICS and ITS.

  In the above description, the base station radio apparatus 3 transmits the position of the emergency vehicle 1a acquired by the position acquisition unit to the control station control apparatus 4. However, the present invention is not limited to this. For example, when the base station wireless device 3 communicates with the emergency vehicle 1a, the control station control device 4 uses the position information of the base station previously assigned to the own device as the position information of the emergency vehicle 1a. You may transmit to.

<Embodiment 2>
FIG. 11 is a diagram showing a configuration of an information distribution system according to Embodiment 2 of the present invention. Hereinafter, in the information distribution system according to the present embodiment, the same components as those in the information distribution system according to the first embodiment are denoted by the same reference numerals, and different parts from the information distribution system according to the first embodiment are mainly described. Explained.

  In the information distribution system according to the first embodiment, the control station control device 4 determines the travel route of the emergency vehicle 1a. On the other hand, in the information distribution system according to the present embodiment, at least one of the plurality of base station wireless devices 3 determines the position of the emergency vehicle 1a and the destination point to which the emergency vehicle 1a should reach from the first wireless device 1. When acquired, the travel route on which the emergency vehicle 1a should travel is determined based on the position and the destination point.

  In the example shown in FIG. 11, a base station wireless device 3 (hereinafter referred to as “base station wireless device 3 f”) that performs wireless communication with the first wireless device 1 determines a travel route. Then, the base station radio device 3f exists in the traveling direction of the travel route determined with the second radio device 2 in the communication area of the own device, and the base station radio device 3 around the base station radio device 3f. Information related to the emergency vehicle 1a is transmitted to the second wireless device 2 in the communication area by simultaneous communication. Here, the base station radio apparatus 3 around the base station radio apparatus 3f means here the base station radio apparatus 3 belonging to the group 5 adjacent to the base station radio apparatus 3f.

  Such an information distribution system according to the present embodiment can suppress the introduction cost of the system as in the first embodiment, and increase the responsiveness and certainty in acquiring information related to the emergency vehicle 1a. Can do. Moreover, according to this Embodiment, since a driving | running route is determined in the base station radio | wireless apparatus 3, the load of the control station control apparatus 4 can be reduced. This is particularly effective when the number of base station wireless devices 3 to be controlled by the control station control device 4 is large and the load on the control station control device 4 is large.

  In the above description, the base station radio device 3f performing radio communication with the first radio device 1 determines the travel route. However, the present invention is not limited to this, and other base station radio devices. 3 may determine the travel route, and two or more base station radio apparatuses 3 may determine the travel route.

<Embodiment 3>
FIG. 12 is a diagram showing a configuration of a traffic light control system according to Embodiment 3 of the present invention that includes the information distribution system described above. Hereinafter, in the traffic light control system according to the present embodiment, the same components as those in the above-described information distribution system are denoted by the same reference numerals, and different parts from the above-described information distribution system will be mainly described.

  The traffic signal control system according to the present embodiment includes a plurality of traffic signals 8 respectively connected to a plurality of base station radio apparatuses 3 in addition to the information distribution system described above. And when the base station radio | wireless apparatus 3 acquires predetermined information (for example, UI telegram which concerns on the above-mentioned step S1) from the 1st radio | wireless apparatus 1, it controls the signal apparatus 8 corresponding to the received said base station radio | wireless apparatus 3. In addition, the traffic light 8 corresponding to the base station radio apparatus 3 in the vicinity of the base station radio apparatus 3 that is present in the traveling direction of the above-described travel route and has acquired the predetermined information is controlled. Here, the base station radio apparatus 3 around the base station radio apparatus 3 that has acquired the predetermined information is the base station radio apparatus 3 belonging to the group 5 next to the base station radio apparatus 3 that has acquired the predetermined information. Shall mean.

  According to the traffic light control system according to the present embodiment as described above, even if the second wireless device 2 is not mounted on the vehicle 2a around the travel route of the emergency vehicle 1a, the vehicle 2a is surely stopped. Can do. Therefore, the travel route of the emergency vehicle 1a can be reliably ensured.

  DESCRIPTION OF SYMBOLS 1 1st radio | wireless apparatus, 1a Emergency vehicle, 2nd radio | wireless apparatus, 2a vehicle, 2b Car navigation apparatus, 3 Base station radio | wireless apparatus, 4 Control station control apparatus, 8 traffic light.

Claims (4)

A first wireless device mounted on an emergency vehicle;
A second wireless device mounted on a vehicle other than the emergency vehicle;
A plurality of base station wireless devices that perform wireless communication with the first and second wireless devices;
A control station control device that controls the plurality of base station radio devices,
The control station controller is
When the location of the emergency vehicle and the destination point that the emergency vehicle should reach are acquired from the first radio device via the base station radio device, the emergency vehicle is based on the location and the destination point. Decide the route you should drive,
The base station radio device corresponding to the travel route is
The information delivery system which transmits the information regarding the said emergency vehicle to the said 2nd radio | wireless apparatus in the communication area of an own apparatus by control of the said control station control apparatus. A first wireless device mounted on an emergency vehicle;
A second wireless device mounted on a vehicle other than the emergency vehicle;
A plurality of base station wireless devices that perform wireless communication with the first and second wireless devices and perform wireless communication with each other;
At least one of the plurality of base station radio devices is
When the location of the emergency vehicle and the destination point that the emergency vehicle should reach are acquired from the first wireless device, a travel route on which the emergency vehicle should travel is determined based on the location and the destination point;
The base station radio device corresponding to the travel route is
The information delivery system which transmits the information regarding the said emergency vehicle to the said 2nd radio | wireless apparatus in the communication area of an own apparatus. The information distribution system according to claim 1 or 2,
An information distribution system comprising a car navigation device mounted on the other vehicle and displaying information on the emergency vehicle notified to the second wireless device. An information distribution system according to any one of claims 1 to 3,
A plurality of traffic lights respectively connected to the plurality of base station radio devices,
When the base station radio apparatus acquires predetermined information from the first radio apparatus, the base station radio apparatus controls the traffic light corresponding to the base station radio apparatus, exists in the traveling direction of the travel route, and A traffic signal control system for controlling the traffic signal corresponding to the base station radio device around the station radio device.

Images