JP2002261685A - Road-vehicle communication system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a road-vehicle communication system capable of providing a push type of service that is transmitted from a road-side unit, and providing service effectively even in a case where only a limited communication chance is available. SOLUTION: The road-vehicle communication system comprises a transmitter/ receiver device for performing wireless communication with a vehicle, a management device for managing the road-side unit, and each service provider which is connected with each other, wherein each service provider sets a priority class to each service, a vehicle-mounted unit comprises priority class setting means for setting the priority class, the management device comprises a provided priority determining device for determining priority of each provided service based on the priority that was set by both the road-side unit and vehicle- mounted unit, and a communication path control device for controlling assignment of a communication path based on the determined priority.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel road-vehicle communication system for providing a service for efficiently transmitting information between a vehicle traveling on a road and a communication facility installed on the roadside. It is.

[0002]

2. Description of the Related Art At present, research and development of intelligent transportation systems (ITS) are being promoted for the purpose of solving problems such as an increase in road congestion and environmental pollution due to exhaust gas. To realize the ITS, road information, danger warnings, etc.
It is necessary to realize an information communication platform for transmitting various types of information.

[0003] Dedicated short-range wireless communication (DSRC: Dedicated Sho) is a technology currently under development for realizing this information communication infrastructure.
rt Range Communication). This limits the communication area to a very narrow range, and enables large-capacity communication between the vehicle and the roadside. Currently, non-stop automatic toll collection system (E
TC (Electronic Toll Collection System) is at the stage of practical use. ETC is a system that automatically collects tolls on toll roads such as expressways by using wireless communication.

[0004] VICS (Vehicle Information Communication System) is currently used as a road-vehicle communication technology.
m). This is a system that provides traffic information such as traffic congestion information by performing wireless communication between a beacon installed on a road and a dedicated unit installed in a vehicle.

[0005] By installing a variety of wireless communication facilities typified by the above-mentioned DSRC on a road, an information communication infrastructure is prepared. Services will be provided. For example, currently the system using DSRC is a system that provides only a single service called automatic toll collection on toll roads, but in the future, it will not only collect tolls on toll roads, but also collect various information such as road information and advertisements. It is considered that various services such as provision, support for safe driving, payment processing at convenience stores and drive-throughs, distribution of music and images, and the like can be received by mounting one vehicle-mounted device on the vehicle.

[0006] The form of providing the various services as described above differs for each service. For example, road information, advertisements,
The provision of various information such as emergency information such as disaster information is a push-type service embodiment that can be provided to all passing vehicles at once. Payment processing, distribution of music and images, and the like are pull-type service modes provided to requested vehicles. Furthermore, among communication-type services, services provided only for vehicles that have requested such as the above-mentioned payment processing and distribution of music and images, and flows into urban areas for the purpose of eliminating ETC and congestion in urban areas Road pricing (ERP: Electronic R) that charges vehicles
Oad Pricing is not a service provided by a request from a vehicle, but a service that is compulsorily executed from the road side for all passing vehicles.

[0007] In order to provide various services in the above-described embodiments in the same communication area, a system capable of processing various services is required. In order to respond to the request for multiple services, the DSRC standard defines an application ID (AID). A service can be identified by the application ID, and different request services can be handled for each vehicle in the same communication area. In this method, the communication path assigned to each vehicle is fixed, and a fixed communication path having a fixed transmission capacity is provided for a fixed number of vehicles. Therefore, service provision requests from each vehicle are all treated equally, and communication channels are not allocated based on the provision priority indicating how much priority each provided service has relative to other services.

On the other hand, when a plurality of vehicles request a plurality of services at the same time, in order to effectively use a limited communication channel, priorities are given to services provided to other vehicles and other services. Must be provided. As a method corresponding to this, a method of controlling the priority of service provision according to a service requested from a mobile station is disclosed in Japanese Patent Laid-Open No. 2000-22423.
It is described in No.1. In this method, a communication path is preferentially assigned to a service requiring a high communication quality level based on a quality level required by a service requested from a mobile station.

[0009]

However, in the prior art, the priority of service provision is determined only from a request from a mobile station, and the presence or absence of an explicit request from a vehicle, such as emergency information or advertisement information, is determined. Regardless of the case, a push-type service transmitted from the roadside is provided at the same time and cannot be provided with a priority.

The importance of each service differs depending on the type of service or the circumstances of each vehicle. For example, there is a possibility that a certain service has a high priority of providing to a certain vehicle, and a low priority of providing the same service to another vehicle. Also, among a plurality of requested services requested from each vehicle, which service is desired to be preferentially provided differs for each vehicle. Further, the importance of each service as viewed from the road side, which provides the service, and the importance of the service as viewed from the vehicle, which is the requesting side, may be different. For example, if an operator along the road offers an advertisement for himself to passing vehicles,
It is an important service for the provider that provides it, but it may not be necessary for the vehicle that receives it.

[0011] For a service provider, the area in which the service is provided may be important. For example, when a business entity present along the road provides an advertisement relating to itself to a passing vehicle, the effect of the advertisement is weak even if information is distributed in a place past the location where the business entity exists. Therefore, the effect of the advertisement becomes higher before the place where the business exists, and it is desirable that the service can be preferentially provided to the area. In such a case, even if the services have the same content of providing advertisement information, it is considered that the priority of the service to be provided differs depending on the location and the service provided by each service provider.

Therefore, the method of allocating a fixed communication path to each service as in the above-mentioned prior art method alone is different from the case where a vehicle moving at high speed passes through a communication area of a limited size. When there are only limited communication opportunities, services cannot be provided efficiently.

An object of the present invention is to provide emergency information, advertisement information, etc.
A push-type service transmitted from the roadside can be provided at the same time regardless of the presence or absence of a request from the vehicle, and limited communication such as when a vehicle moving at high speed passes through a limited communication area. It is an object of the present invention to provide a road-to-vehicle communication system capable of efficiently providing a service even when there is only an opportunity.

[0014]

SUMMARY OF THE INVENTION According to the present invention, there is provided a road-to-vehicle communication for setting the priority of a service to be provided in response to a request from both road and vehicle, and controlling how to allocate the provided service to a communication path in accordance with the priority. In the system.

That is, the present invention is connected to an in-vehicle device mounted on a vehicle traveling on a road and a management device of a communication facility manager who manages a roadside control device in road-to-vehicle communication, and is formed by the roadside control device. A service providing device that provides a service for transmitting various types of information to vehicles existing in a communication area to be transmitted and received, and transmits and receives information by wireless communication between the vehicle-mounted device and the roadside device When providing multiple services within the same communication area with transmission / reception means, set a priority class that indicates how much priority each service provider provides to other services over other services A priority class setting device, and a service class management device, which is installed in the management device of the facility manager and determines the service priority of each service based on the set priority class. A priority determination device, is obtained by a configuration in which a communication path control device which controls the allocation of the communication channel based on the determined priorities.

The service provided in the same communication area includes a push-type service provided to all or some vehicles existing in the communication area regardless of whether a request from the vehicle exists and a request from the vehicle. In the case where there are a plurality of pull-type services to be provided correspondingly, the pull-type service is provided in accordance with the determined provision priority in addition to the service requested for each vehicle.

Further, according to the present invention, when communicating with the on-vehicle device, a service requested from each vehicle existing in the communication area is requested from another service requested from the vehicle or another vehicle simultaneously existing in the communication area. A priority class setting device that sets a priority class indicating how much priority the service is to be provided, and a provision priority class of each provided service set in the communication facility management device; The configuration is provided with a provision priority determining device that determines the provision priority of each service based on the priority class for the service set on the vehicle side.

The provision priority of each service in the means for determining the provision priority of each service is determined by the following method. For each priority class transmitted from the roadside service provider or the vehicle side, the magnitude of the relative priority with respect to the other priority classes is stored in advance. Then, by referring to the stored contents, the priority class set for each transmitted service is compared with the priority classes of all the services. The comparison result is regarded as a matrix, and the service priority is determined by obtaining the eigenvalue and eigenvector of the matrix.

The present invention also provides a method for setting a priority class by a method in which a roadside service provider or a vehicle-side user as described above sets a service provision priority by a subjective method. In addition to the above, a configuration is provided with a provision priority determining device that can set a service provision priority class based on the required communication traffic of the service and the traveling speed of the vehicle and determine the service provision priority. It was done.

Further, the present invention provides a storage means for storing position information and a communication time of a communication area in which each passing vehicle communicates, and a next step based on the position information and the time information stored in the means. Prediction means for predicting a communication area through which the vehicle passes, and if all or some of the services to be provided to each vehicle cannot be provided in the communication area in which communication is currently being performed, the provision of the service is prioritized. Updating means for updating the degree class, transfer means for transferring the remaining data to be transmitted to the vehicle to the communication area predicted by the prediction means, an ID number for identifying the vehicle, and the updated provided priority class And a provision priority determining device that determines a priority of service provision based on the transferred priority class when the vehicle reaches the predicted communication area. It is.

Priorities are set for the services to be provided in response to requests from both road and vehicle, and how to allocate the provided services to the communication paths is controlled in accordance with the priorities.

[0022]

(Embodiment 1) FIG. 1 is a diagram showing an apparatus configuration of a service providing system according to the present invention. Figure 1
As shown in FIG. 1, a plurality of transmitting / receiving apparatuses 102 and 103 are installed on a road 101. The transmission / reception devices 102 and 103 emit radio waves toward the road surface to form communication areas 104 and 105 having a predetermined size. The transmission / reception devices 102 and 103 are roadside control devices, respectively.
106 and 107 are connected. The roadside control devices 106 and 107 are connected to a management device 109 in a center that manages these devices via a public network or a dedicated line 108. On the other hand road 1
On-vehicle devices for performing predetermined communication with the transmitting / receiving devices 102 and 103 are mounted on the vehicles 110 and 111 traveling on 01.

The management device 109 includes a plurality of service providers 1
12, 113, 114, and 115 are connected via a public network or a dedicated line 124. These service providers 112, 11
Reference numerals 3, 114, and 115 hold information on services provided by wireless communication to the vehicles 110 and 111 entering the communication areas 104 and 105, respectively, and transmit the information to the management device 109 in the center. FIG. 1 shows a state in which information of one provided service is held for one service provider, but a plurality of information may be held so that a plurality of provided services can be provided. The retention of the information on the service and the transmission to the management device 109 are performed by the respective service providers 112, 113, 1
Service providing devices 116, 118, 120, 12 managed by 14, 115
Done by two.

Each service provider 112, 113, 114, 115
Transmits, together with the service data, information 201 having contents as shown in FIG. 2 to the management device 109 in the center. information
201 is an ID 202 for identifying a service and a service name 20
3. Provided service class 204 and provided priority class 205. In FIG. 2, each service provider 112, 113, 114, 115
Are collectively shown.

The provided service class 203 is a parameter indicating what kind of service is provided. In the case of FIG. 2, it is classified into three classes from 1 to 3. The first class is a service that is transmitted to all vehicles irrespective of whether the vehicle explicitly wants to provide them. Examples of services belonging to this class include provision of emergency information such as disaster information. Two
The first class is a service that is transmitted to all vehicles except those that have refused to be provided in advance. Examples of services belonging to this class include provision of traffic information and advertisements. The third class is a service that is transmitted when there is a request from the vehicle. Examples of services belonging to this class include services such as music and video distribution. Classes 1 and 2 can be said to be broadcast-type or push-type service provision modes, and class 3 can be said to be a two-way communication-type or pull-type service provision mode.

The provision priority class 204 is a numerical value indicating how much priority each service should be provided to a vehicle with respect to other services. This value is set as a value within a certain range of the service provider itself. In the case of the present embodiment, it can be set in three levels of classes, and the higher the number, the higher the priority can be provided compared to the others. The setting of the provision priority class is performed by the priority class setting devices 117, 119, 121, 123 managed by the respective service providers 112, 113, 114, 115.

The above information is sent to the provided service priority determining device 125 in the management device 109 in the center and used for the next processing.

The provided service priority determining device 125 is a numerical value indicating the priority of each service provided by each service provider 112, 113, 114, 115 among all available services. Is calculated.
This calculation is performed using the following method.

First, reference is made to a provision priority class comparison table 301 as shown in FIG. This table 301 is stored in the comparison table storage device 126 in the management device 109,
It is a numerical value representing how much a certain priority class a has priority over another priority class b including itself. Table 3 in the case of the example shown in FIG.
If 01 is regarded as a matrix T1, the value of each element T1 (a, b) of T1 is T1 (a, b) = 1 when the provision priority class a has the same priority as the provision priority class b. , T1 (a, b) for slightly higher priority
= 2, T1 (a, b) = 3 when priority is given. When a = b, T1 (a, b) = 1, and the relationship between T1 (a, b) and T1 (b, a) is T1 (a, b) = 1 / T1 (b, a).

Using this table 301, it is determined how much priority each service provided by each service provider 112, 113, 114, 115 has among all the services that can be provided. Specifically, it is calculated as follows. First, for service I, the service priority class 204 is compared with another service J including itself. Then, referring to the provision priority class comparison table 301, the size T2 of the relative priority class of the service I relative to the other service J
Find (I, J). For example, in the case of the example shown in FIG. 2, when I = 1, that is, in the case of the service 1, first, T2 (1, 1) = 1. Since the priority class of service 1 is 3 and the priority class of service 2 is 2, T2 (1,
2) = T1 (3,2) = 2. Similarly, T2 (1,3) = T1 (3,1) = 3,
T2 (1,4) = T1 (3,2) = 2. This operation is performed for all provided services, and the matrix T2 (I,
J). The obtained T2 (I, J) becomes a table 401 as shown in FIG.

From the table shown in 401, priority weights A (1), A (2), A (3), A (4) for each provided service
Is calculated. Specifically, first, the eigen equation of the matrix T2

[0032]

(Equation 1)

From this, a solution x = [x1, x2, x3, x4] is obtained. This solution x is an eigenvalue for the matrix T2. Then, the eigenvector w (xmax) for the maximum value xmax of the eigenvalues x is x
The value w (xmax) / xmax divided by max is the priority weight of service I A (I)
Becomes The priority weight A (I) is expressed as a percentage, and in the example, A
(1) + A (2) + A (3) + A (4) = 1.

The priority weight calculated by the above method
A (1), A (2), A (3), and A (4) are stored in the roadside service priority information storage device 127. Hereinafter, this information 201 is referred to as roadside service priority information.

On the other hand, the transmitting / receiving device 10 installed on the road
Vehicles that receive various services by using 2, 103 are obtained by purchasing the above-mentioned in-vehicle equipment to receive the services, and contract with the facility manager who manages the communication facilities and centers on the road. Need to tie.

Each vehicle can determine the priority of receiving each service with respect to other vehicles when concluding a use contract. The determination can be made, for example, by selecting which of the priority classes defined within a certain range. In the case of the present embodiment, it can be set in three stages, and the higher the number, the higher the priority. Hereinafter, this priority class will be referred to as a contract setting priority class.

As described above, after each vehicle has concluded the use contract, when actually receiving the service, it is possible to determine what kind of service the user wants to receive. For example, Figure 5
As shown in (5), a desired service is selected by a selection button 502 on the menu screen of the display 501 of the in-vehicle device. The selected service is displayed as 503. In addition, for each service, it is possible to determine whether it is a service that you want by all means, a service that you want to have, or a service that you do not need. As a method of this selection, for example, a desired service can be specified by a numerical value such as 1 for a desired service, 2 for a good service, and 3 for a service not required. This value is shown on the display as 504. The value can be changed, for example, by clicking the change button 505 and selecting a desired value. Hereinafter, this information will be referred to as a use-time setting priority class. In addition, the above-described contract-time setting priority class may be configured to be set or changed on the display as indicated by 506 in FIG.

Next, the operation at the time of communication will be described. A packet 601 as shown in FIG. 6 is constantly transmitted from each of the transmission / reception devices 102 and 103 installed on the road. This packet includes a synchronization field, an information field, and an error control signal. In the information field, in addition to information such as position information of the communication area, use frequency information, etc., service ID information for identifying a service that can be provided in the communication area, and information about a communication path to be allocated to each vehicle described later are provided. include.

As shown in FIG. 1, when each vehicle enters a certain communication area, it receives a connection packet constantly transmitted from the transmission / reception device and establishes synchronization. Then, information 701 as shown in FIG. 7 is transmitted simultaneously with the link establishment request. The information includes a vehicle ID 702 for identifying a vehicle, an ID 703 for identifying a service requested on the roadside, a contract setting priority class 704, and a use setting priority class 705.
FIG. 7 shows a case where four vehicles have transmitted information. Hereinafter, this information 701 will be referred to as vehicle request service priority information. This information 701 is stored in the vehicle request service priority information storage device 128 in the management device 109 on the center side.

The service allocation processing device 129 stores the information 201 stored in the roadside provided service information storage device 127 and the vehicle request service priority information storage device transmitted from each vehicle.
The information 701 stored in the storage unit 128 is collated to determine a provision priority for each service provided to each vehicle.

The processing contents of the service allocation processing device 129 will be described below.

FIG. 8 shows an outline of the processing of the service allocation processing device 129. In step 801, roadside service priority information 201 is input, and in step 802, vehicle request service priority information 701 is input. In step 803,
The service to be provided to each vehicle is determined by referring to the requested service ID, the provided service class, and the in-use setting priority class among the information input in steps 801 and 802.

Next, in steps 804 and 805, the contract-time setting priority class and the use-time setting priority class are compared between the vehicles. In step 806, the priority weight for each service of each vehicle is calculated with reference to the comparison result in steps 804 and 805 and the weight information of the contract setting priority class-use setting priority class described later. In step 807, the priority weight of each provided service is determined for each vehicle with reference to the priority weight of the provided service, and is output.

Next, processing up to determination of a service to be provided to each vehicle, that is, processing up to step 803 in FIG. 8 will be described with reference to FIG. Steps 901 and 902
, The roadside service priority information and the vehicle request service priority information are input. In step 903, the service reference variable I is set to an initial value, and in step 904, the vehicle reference variable J is set to an initial value.

In step 905, it is determined whether the service class of service I is 1 or not. If 1, go to step 908. On the other hand, if it is not 1, the next step 906
Proceed to.

In step 906, it is determined whether or not the service I exists in the requested service ID transmitted from the vehicle J. If not, the service I is not provided to the vehicle J, and the process proceeds to step 909. On the other hand, if there is the service I, the process proceeds to the next step 907.

In step 907, it is determined whether or not the used priority class of the requested service ID is other than 3. Then, if the vehicle J determines that the service I is an unnecessary service, the process proceeds to step 909 without providing the service I. On the other hand, if the in-use setting priority class is other than 3, the process proceeds to the next step 908.

In step 908, it is determined that the service I is to be provided to the vehicle J, and the flow advances to step 909.

At step 909, it is determined whether or not the service I is to be provided to all vehicles.
If any of the communicating vehicles has not been determined, the vehicle reference variable J is incremented by one in step 910, and the process returns to step 904. On the other hand, when it is determined whether or not to provide the service I to all vehicles, the process proceeds to the next step 911.

In step 911, it is determined whether or not to provide all services. And if any services have not been determined yet, step 912
In step 903, the service reference variable is increased by one.
Return to On the other hand, if all the available services have been determined, the data is output and the processing ends.

The information output by the processing so far is a table 1001 as shown in FIG. This table 10
01 is the service ID 1002, the vehicle ID 1003 that provides the service,
Contract setting priority class 1004, use setting priority class
Consists of 1005. Services 1 and 2 have service classes
Since it is 1 or 2, there is no value of the setting priority class at use. Next, processing until the priority weight for each vehicle of each provided service is determined, that is, step 804 in FIG.
Will be described with reference to FIGS. 11 (a) and 11 (b).

The input data in this process is the data 1001 shown in FIG. In step 1101, the number n of services to be provided is input. In step 1102, the service reference variable I is set to an initial value. In step 1103, the number N of vehicles that provide the service I is input. Steps
In 1104, the vehicle reference variable J is set to an initial value.

In step 1105, another vehicle reference variable K is set to an initial value. In step 1106, FIG.
Reference is made to the contract-time setting priority class comparison table stored in the service allocation method storage device 130 described above. The contract setting priority class comparison table is a table 1201 as shown in FIG. This table 1201 is the same table as the provided service priority class comparison table 301 described above, and shows how much a certain contract setting priority class a has priority over another contract setting priority class b including itself. It is a numerical representation of whether or not it is done. The meaning of the value of each element in the table is the same as in the provided service priority class comparison table 301.

This contract setting priority class comparison table
In step 1107 with reference to 1201, the contracted setting priority classes of the vehicles J and K are compared, and the relative priority of the vehicle J with respect to K is calculated. The method of calculation is the same as the method of comparing the provided service priority classes when calculating the roadside provided service priority weight. In step 1108, it is determined whether or not K = N, that is, whether or not the vehicle J has been compared with all other vehicles including itself. If there is a vehicle that has not been compared, the value of the reference variable K is increased by one in step 1109, and the process returns to step 1106. If all vehicles have been compared, go to step 1110.

In step 1110, it is determined whether or not the relative priority of all vehicles has been calculated with respect to other vehicles. If there is a vehicle that has not been calculated, the value of the reference variable J is increased by one in step 1111 and the process returns to step 1104. On the other hand, if the calculation of the relative priority of all the vehicles with respect to the other vehicles is completed, the process proceeds to step 1112. The output from step 1110 is a table 1301 as shown in FIG. This table is called an inter-vehicle contract setting priority class comparison table.

The priority weight w2 (I, J) of each vehicle J for the service I is calculated from the inter-vehicle contract priority setting priority comparison table 1301 input in step 1112. The calculation method is the same as the method of calculating the priority weight A (I) for each service I stored in the roadside service priority information storage device described above.

In the next step 1113, it is determined whether or not the in-use setting priority class is set for the service I. If it has been set, the process proceeds to the next step 1114. If not set, the process proceeds to step 1115, where weighting coefficients wa and wb described later are set to wa = 1 and wb = 0, respectively. In step 1114, the vehicle reference variable J is set to the initial value 1, and in step 1116, another reference variable K is set to the initial value 1.

In step 1117, the in-use setting priority class comparison table stored in the service allocation method storage device 130 is referred to. The in-use setting priority class comparison table is a table 1401 as shown in FIG. This table stores how much a certain use setting priority a has priority over another use setting priority b including itself. Figure 12 shows the meaning of the table values
Is the same as the contract-time setting priority class comparison table 1201 shown in FIG.

This use-time setting priority class comparison table
With reference to 1401, in step 1118, the used setting priority classes of the vehicles J and K are compared, and the relative priority of the vehicle J with respect to K is calculated. Calculation method is step 11
It is the same as the method of comparing the contract-time setting priority classes in 07. In step 1119, it is determined whether or not K = N, that is, whether or not the vehicle J and all other vehicles including itself have been compared in the in-use setting priority class.
If there is a vehicle that has not been compared, the reference variable K is incremented by one in step 1120, and the process returns to step 1117. If all vehicles have been compared, the process proceeds to step 1121. In step 1121, it is determined whether or not the magnitude of the relative priority of all vehicles with respect to other vehicles has been calculated. If there is a vehicle whose priority has not been calculated, the reference variable J is incremented by one in step 1122, and the process returns to step 1116. On the other hand, when the priorities for all the vehicles have been calculated for the other vehicles, the process proceeds to step 1123. The output from step 1122 is a table similar to the table 401 output from step 1111. This table is called an inter-vehicle use setting priority class comparison table.

The priority weight w3 (I, J) of each vehicle J for the service I is calculated from the inter-vehicle use priority class comparison table input in step 1123. The calculation method is the same as the processing in step 1112.

At step 1124, the contract setting priority-use setting priority comparison table and weight information w1 stored in the service allocation method storage device 130 are referred to. Figure 15 shows the contract priority setting-use priority setting comparison table.
As shown at 1501, the contract setting priority and the use setting priority store how much priority is given to each other. The meanings of the values are the same as those in the tables 301, 1201, and 1401 described above. The weight information w1 is 1 in FIG.
It is a value obtained by calculating an eigenvalue and an eigenvector from the table T7 as shown in 502. w1 can be calculated in advance regardless of the number of communicating vehicles or the number of requested services. The calculation result of weight information w1 is
w = [w1 (1), w1 (2)] = [0.614, 0.386]. This weight information w1 is substituted into coefficients wa and wb described later, and wa = w1 (1), wb = w1
(2).

In step 1125, of the roadside service priority information 201 stored in the roadside service priority information storage device 127, the priority weight for the service I
See A (I).

In step 1126, the priority weight w (I, J) of the service I for the vehicle J is calculated. Specifically, it is calculated by the following equation. w (I, J) = A (I) * (wa * w2 (I, J) + wb * w3 (I, J)) ... (2) In step 1127, calculate the priority weight for each vehicle for all services. It is determined whether or not it has been performed. If all calculations have been performed, the processing result is output and the processing ends.
On the other hand, if there is a service that has not been calculated, the service reference variable I is incremented by one in step 1128, and step 1103
Return to

As shown in a table 1601 in FIG. 16, the processing result includes information 1603 indicating to which vehicle each service 1602 is provided, and priority weight information of each service for each vehicle.
1604 is output.

The processing result calculated by the service assignment processing device 129 as described above is passed to the communication channel control device 131 in the management device 109, and is used when determining the assignment of the communication channel to each vehicle.

Hereinafter, the communication path control processing device 131 will be described. As shown in FIG. 17, n fixed length slots 1701
Is defined as a basic unit of information data transmission. This frame is included in the information field in FIG. 6 described above. Each slot in this frame is a communication path allocated to each vehicle. As a method of allocating the communication channel, for example, there is a method disclosed in JP-A-11-68848. This is a method of dynamically changing the number of slots and the transmission rate assigned to each vehicle according to the traffic volume of the traveling vehicle. In the present invention, this method is applied, and the number of slots to be allocated to each vehicle and the transmission rate are determined using the result calculated by the service allocation processing device 129.

The operation of the communication path control device 131 will be described below with reference to the drawings.

FIG. 18 is a flowchart showing the operation of the communication path control device 131. First, in step 1801, it is determined whether or not there is a vehicle existing in the communication area and requesting the establishment of a link with the roadside. As described above, this is performed by the vehicle receiving the packet 601 as shown in FIG. 6, which is constantly transmitted by the transmitting / receiving device, and determining whether or not a link establishment request has been received. If there is, the process proceeds to the next step 1802. On the other hand, if it does not exist, the process proceeds to step 1804 described later.

In step 1802, the service allocation processor 129 calculates the service allocation priority weight for each vehicle by the processing method described above.

Then, in step 1803, a method of allocating a slot to each vehicle is determined from the service allocation priority weight calculated.

The operation in step 1803 will be described with reference to FIG. In FIG. 19, first, in step 1901, the vehicle reference variable I is set to an initial value. And step 1
In 902, a slot assignment table 2001 as shown in FIG. This table stores, for each slot, the ID 2002 of the vehicle assigned, the ID 2003 of the service to be provided, the priority weight 2004, and the transmission rate 2005. When the transmission rate is set to the full rate, it means that the slot is occupied over all time frames.
On the other hand, when 1/2 is set, it means that the time frame is divided and the slot is shared with other provided services.

At step 1903, it is determined whether or not an empty slot exists. And step if it exists
Proceeding to 1904, a communication channel with the vehicle I requesting link establishment is allocated to an empty slot. The service to be allocated to the empty slot has the highest priority weight among the services provided to the vehicle I. On the other hand, if there is no empty slot, the process proceeds to step 1905.

At step 1905, it is determined whether or not a plurality of slots are allocated to the same vehicle.
If a plurality of slots are assigned to the same vehicle, the slot to which the service with the lowest priority weight is assigned among the plurality of slots assigned to the same vehicle is released in step 1906. I do. Then, the process proceeds to step 1904, where a communication channel with the vehicle I is allocated to the empty slot.

On the other hand, if it is determined in step 1905 that there is no vehicle to which a plurality of slots are allocated, then in step 1907, the transmission rate of the slot having the smallest priority weight is reduced, and a communication channel is allocated.

In step 1908, the slot assignment table 2001 is updated from the processing results so far, and the vehicle ID, the provided service ID, the priority weight information, and the transmission rate for the newly assigned slot are written. The provided service ID and the priority weight information refer to the service having the highest priority weight among the services provided to each vehicle, and write the information.

At step 1909, it is determined whether or not slots have been allocated to all vehicles requesting link establishment. If at least one slot has been assigned to all vehicles, the process proceeds to the next step 1910. On the other hand, if there is a vehicle for which a slot to be allocated has not been determined yet, the vehicle reference variable I is incremented by one in step 1911 and the process returns to step 1902.

At step 1910, after allocating at least one slot to all the vehicles, it is determined whether or not there is an empty slot. If there is an empty slot, the process proceeds to the next step 1912. On the other hand, if not present, the process of step 1803 in FIG. 19 ends.

In step 1912, a communication channel is allocated to a service having the highest priority weight among services provided to vehicles whose slots are not yet allocated to empty slots. Then, in step 1913, the slot assignment table is updated, and the process returns to step 1910. Thereafter, the processes from step 1910 to step 1913 are repeated until there are no more empty slots. When there are no more empty slots, the process of step 1803 in FIG. 18 ends.

On the other hand, if it is determined in step 1801 that there is no vehicle requesting link establishment, the process proceeds to step 1804. In step 1804, it is determined whether or not there is a vehicle that is currently communicating within the communication area. If it exists, the data is transmitted in step 1805 based on the slot assignment table 2001. If it is determined that there is no vehicle performing communication, it means that there is no vehicle performing communication or a vehicle requesting link establishment in the communication area. Is waiting for a link establishment request from the vehicle.

In step 1806, it is determined whether or not there is a vehicle for which communication has ended or a service for which data transmission has ended. If it is determined that it does not exist, the process returns to step 1801. On the other hand, if there is a vehicle that has finished communication or a service that has finished transmitting data, step 18
In 07, the service allocation processing device 129 recalculates the priority weight of each provided service for each vehicle.

Then, in step 1808, slot reassignment is performed. The reallocation method is the same as the operation shown in step 1803.

As described above, according to the present embodiment, in the road-to-vehicle communication, the priority class for the service is set for both the road and the vehicle, and the priority of service provision is determined based on the class. A service providing method for more efficiently using a communication path can be realized.

(Second Embodiment) A table 2101 shown in FIG.
Is the content of the roadside service priority information stored in the. Roadside service priority information 201 in the first embodiment
The difference is that the required traffic class 2102 is stored in addition to the provision priority class information for each service determined by the service provider. The required traffic is a parameter that determines how much traffic to transmit to other services. This value is 3 in the example
It can be set in stages, and the larger the number, the greater the required communication volume. This class 2102 is also transmitted from the service provider.

The service based on the required traffic class
By calculating the priority weight A (I) for I in the same manner as in the first embodiment, it is possible to preferentially provide a service with a larger traffic.

(Embodiment 3) The priority weight A (I) for the service I may be calculated by combining the required traffic class 2102 and the provided service priority class 205. The calculation method in this case can be realized by using the same method as that in the first embodiment in which the priority weight is calculated by combining the contract setting priority and the use setting priority.

Fourth Embodiment In the first embodiment, each vehicle J of each service I is used by using both the contract setting priority and the use setting priority.
Has been calculated, but the priority weight w (I, J) may be obtained by using only one of them. When the priority weight w (I, J) is obtained using only the contract setting priority, in FIG. 11 showing the processing of the service allocation processing device 129, the processing from step 1113 to step 1124 is omitted, and the contract setting priority is set. Weight between priority and use setting priority w
This can be realized if a and wb are set to wa = 1 and wb = 0. When the priority weight w (I, J) is obtained using only the use setting priority, the processing from step 1104 to step 1112 in FIG. 11 is omitted, and the processing between the contract setting priority and the use setting priority is performed. This can be realized by setting the weights wa and wb to wa = 0 and wb = 1.

(Embodiment 5) In the processing in the communication channel control device 131, the method of allocating slots can be as follows.

The method of allocating slots in the first embodiment is a method of allocating at least one slot to each vehicle as shown in FIG. In the case of the present embodiment, slots are allocated in the order of the calculated priority weight shown in FIG.

Hereinafter, the processing flow of the slot allocation method according to the present embodiment will be described with reference to FIG.

First, in step 2201, the maximum service allocation number Smax is set. This value Smax is set on the center side and is a value that determines how many services are to be allocated to the slot at maximum. And step 2202
, Refer to the slot assignment table 2001.

At step 2203, it is determined whether or not an empty slot exists. If there is an empty slot, a communication channel for providing a service having the highest priority weight among services to which no slot has been allocated is allocated in step 2204.

On the other hand, if it is determined in step 2203 that there is no empty slot, the process proceeds to step 2205.
In step 2205, it is determined whether the number of services allocated to the slot is equal to or less than Smax. And if Sm
If the value is equal to or larger than ax, the slot allocation process for the service is terminated. On the other hand, if it is equal to or smaller than Smax, the process proceeds to step 2206. In step 2206, a service having the lowest priority weight among services to which slots are currently allocated at the full rate is selected, and a communication channel is allocated by changing the transmission rate of the channel. In step 2207, the slot assignment table 2001 is updated. Then, the process returns to step 2203 to repeat the processing.

(Embodiment 6) In case of DSRC The size of the communication area covered by one transmitting / receiving apparatus is about 20 to 30 m.
In the case where communication is to be performed in an area where the communication area is extremely limited as described above, the time during which the vehicle is present in the communication area, that is, the communicable time greatly differs depending on the running speed of the vehicle. As the traveling speed increases, the opportunity for communication becomes more limited. In the present embodiment, an embodiment will be described in which a vehicle having a higher traveling speed can receive a service preferentially using traveling speed information of the vehicle.

As described in the first embodiment, when the vehicle enters the communication area, it transmits a link establishment request and information 701. At the same time as transmitting these information, the current traveling speed information of the vehicle is transmitted. Then, using the traveling speed information, the service allocation processing device 129 determines the provision priority of each service provided to each vehicle.

Hereinafter, a method of determining the provision priority in this embodiment will be described.

FIG. 23 is a diagram showing a processing flow in the service allocation processing device 129 in this embodiment. Figure 23
The processing flow shown in FIG. 13 shows the processing subsequent to the processing flow in the service allocation processing device 129 described in the first embodiment. In step 2301, the traveling speed information transmitted from each vehicle is referred to. In step 2302, the traveling speed information is compared between the vehicles, and a priority weight w4 (J) related to the traveling speed for each vehicle J is calculated. Specifically, this is performed as follows. First, the table shown in FIG.
See 2401. This table 2401 is a table stored in the service allocation method storage device 130. This table numerically expresses to what degree a vehicle that has transmitted certain traveling speed information should provide a service in preference to a vehicle that has transmitted other traveling speed information. In the case of table 2301, running speed information is 60 km / h
It is divided into three classes: less than 60km / h, less than 120km / h, and 120km / h or more. The meanings of the values in the table are the same as those in the table 301 described in the first embodiment. This table 2301
Is used to calculate the priority weight w4 (J) related to the traveling speed for each vehicle J by comparing the traveling speed information transmitted from each vehicle between the vehicles. The method of calculating the priority weight w4 is the same as the method of calculating the priority weight w2 from the in-use setting priority class in the first embodiment.

In step 2303, the table shown in FIG.
Reference is made to 2501 and weight information w5. This table 2501 is stored in the service allocation method storage device 130, and includes the priority weight w4 calculated from the traveling speed information and the first embodiment.
The priority weight w4 (J) calculated in step 2302 and the priority weight w (I, J) of the service I for the vehicle J calculated in step 1126 of FIG. It is a numerical representation of whether or not it is done. The meaning of the value is the same as in table T7 described in the first embodiment. The calculation method of the weight information w5 and the meaning of the value are the same as those of the weight information w1 in the first embodiment.

In step 2304, the priority weight w6 (I, J) of the service I for the vehicle J is calculated using the values calculated up to step 2303. Specifically, it is calculated by the following equation. w6 (I, J) = w5 (1) * w4 (I, J) + w5 (2) * w (I, J) (3) Then, in step 2305, the processing result is output and the processing ends. The processing result is obtained by replacing the priority weight w (I, J) in FIG. 16 described in the first embodiment with w6 (I, J).

(Embodiment 7) The above embodiments have been described on the premise that communication is performed within one continuous communication area. When communication is to be performed in an area where the communication area is extremely limited, such as DSRC, in the embodiments described so far, a service having a low priority weight for service execution may not complete communication in one communication area. is there. As described above, when communication is not completed in one communication area, a method of performing communication for the incomplete communication in another remote communication area has been considered.
As an example of this method, there is a method disclosed in JP-A-2000-115055. This method saves and updates the history of the position information of each vehicle by storing which antenna each vehicle has communicated with on the road side, and estimates the communication area for the next communication based on the position information. , For transferring data to the transmitting / receiving device.

In the present invention, a method of applying this method and providing a service preferentially in a next communication area to a vehicle which cannot provide all necessary services in a certain communication area will be described below. .

FIG. 26 is an apparatus configuration diagram showing an embodiment of this embodiment. The difference from the sixth embodiment is that the vehicle traffic history storage device 2601 stores the position information and time of the area where communication is currently performed, and the communication area through which the vehicle passes from the history of the past position and time. Communication area prediction device for prediction
2602 has been added.

FIG. 27 shows a processing flow of the communication path control device in this embodiment. Step 2701 to Step 27
The processing up to 05 is the same as the processing from step 1801 to step 1805 in FIG. 18 described in the first embodiment. Step 2703 may use any of the methods of the first and fifth embodiments.

After the slots are allocated in step 2703, the process proceeds to step 2706 in the case of the present embodiment. In step 2706, the ID of the vehicle currently communicating and the position information and time information of the communication area currently communicating are stored in the vehicle traffic history storage device 2301. The communication area through which the vehicle will pass in the future is predicted from the history of the position information and the time information of the communication area in which the past communication has been performed stored in step 2707. The prediction method may be, for example, the closest communication area among the communication areas that have not passed yet from the communication area that has passed last. Alternatively, the traveling direction of the vehicle may be calculated from the information on the passing position and the time, and may be set as the closest communication area existing in the direction. Or Example 6
As shown in (1), the nearest communication area existing in the traveling direction may be determined by using the traveling speed information transmitted from the vehicle. Further, a plurality of candidates may be given as the predicted communication area. This processing is performed by the passing communication area prediction device 2301. After ending the processing of step 2707, step 27
Proceed to 05.

In step 2708, it is determined whether there is a vehicle or service for which communication has been completed. If not, processing is performed in the same manner as in the first embodiment. On the other hand, if it is determined that there is, the process proceeds to step 2709 in the present embodiment. In step 2709, it is determined whether or not there is a vehicle that has not received all services to be provided among the vehicles whose communication has been completed. This means that it is determined whether or not there is a vehicle that has left the communication area without receiving all necessary services yet. Then, if it is determined that it does not exist, the process proceeds to step 2712. The processing in step 2712 is the same as the processing in step 1807 in FIG. 18 described in the first embodiment.

On the other hand, if it is determined in step 2709 that the data exists, the flow advances to step 2710. In step 2710, a process of changing the priority weight of the service provided to the vehicle for which communication has not been completed is performed. Specifically, the in-use setting priority class of the communication uncompleted vehicle currently stored on the roadside is reset to the next higher level. Alternatively, the level of the service priority class stored in the roadside service priority storage device may be set to the next higher level. In step 2711, the changed priority class information, the remaining data, and the ID information for identifying the vehicle are transferred to the management device that manages the communication area predicted in step 2707. The subsequent processing is the same as the processing in the first embodiment.

On the other hand, in the management device on the side to which the priority weight and the remaining data transfer have been transferred, when the vehicle enters the communication area, the data is transferred instead of the priority information sent from the vehicle. The priority weight of the provided service is calculated using the priority class, and the allocation of the priority slot is determined. Alternatively, the priority class of the service stored in the roadside service priority storage device 127 is reset to the transferred priority class, and the priority weight is calculated.

With the above-described configuration, a service that cannot provide all necessary services in a certain communication area is provided with priority in a communication area that is predicted to pass next in a communication area. It becomes possible.

Next, an embodiment of a service using the embodiment of the present invention will be described. (1) Case of Distributing Advertising Information of Roadside Operators As an example of the service 2 in the roadside service priority information described in the first embodiment, there is distribution of advertising information of roadside operators. For example, as shown in FIG. 28, a plurality of transmission / reception devices 2801, 2802, 2803 are arranged on the roadside, and a plurality of service providers 2804 providing advertisements at a certain point along the road,
There are 2805 and 2806. Examples of service providers include gas stations, convenience stores, and restaurants. In such a case, the service providers 2804, 2805, and 2806 set the center so that the priority class for the service 2 stored in the roadside service priority information storage device 127 becomes larger as the communication area exists at the location where the provider exists. Request to. By performing such a setting, it is possible to more effectively transmit information at a point close to the area where the roadside business exists, that is, at a point where the influence of the advertisement is greater.

(2) When providing service to emergency vehicles For vehicles that require urgent information, such as emergency vehicles, fire trucks, police vehicles, etc., the priority class set on the road side should be set to a large value. By setting, it is possible to quickly respond to a request from an emergency vehicle. Also, the present invention can be realized by setting a contract-time priority class for an emergency vehicle to a level that cannot be set for other general vehicles.

(3) When providing services to public vehicles and logistics trucks When providing operation management services such as route buses, taxis, and trucks, there are a number of transmission / reception devices installed on the road, which are convenient for management. An embodiment is conceivable in which a point at which a service is to be provided with a higher priority is selected, and a roadside setting priority class is set higher at that point. Further, the present invention can be implemented by setting a unique contract setting priority class or use setting priority class that cannot be set by other general vehicles.

(4) When providing services of ETC and ERP Services such as ETC and ERP depend on whether there is an explicit service request from a passing vehicle or not, and whether or not another service is requested. Need to run the service. Therefore, it is possible to cope by setting the highest priority class to be set on the road side.

(5) When a service is provided in response to a request from a general vehicle A service in which a user downloads various data from a service provider in response to a request, such as distribution of music and distribution of various video information. In the case of, the service can be provided according to the priority set by each user. On the other hand, since service providers cannot predict in advance when and where users want to provide services, the service priority class set on the roadside is fixed regardless of the location of the communication area. It is conceivable to set it.

[0113]

According to the present invention, it is possible to simultaneously provide a push-type service transmitted from the roadside regardless of whether or not there is a request from the vehicle, such as emergency information and advertisement information, and to provide a vehicle moving at high speed. It is possible to provide a road-to-vehicle communication system capable of efficiently providing a service even when there are only limited communication opportunities such as when the vehicle passes through a limited communication area. In addition, by determining the priority of the service to be provided in consideration of the requirements of both the service provider and the vehicle receiving the service, a limited communication path can be used more efficiently.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating a system according to a first embodiment of the present invention.

FIG. 2 is a view showing the contents of information transmitted by each service provider 112, 113, 114, 115 to a management device 109 on the center side.

FIG. 3 is a diagram showing contents of a provision priority class comparison table used for calculating a provision priority weight of each service.

FIG. 4 is a diagram showing the contents of a table representing the result of comparing the provided priority classes between provided services.

FIG. 5 is a diagram showing an example of display on a display of an in-vehicle apparatus for setting a provided service and its provided priority class.

FIG. 6 is a diagram showing the contents of a packet constantly transmitted from a roadside transmitting / receiving device.

FIG. 7 is a diagram showing contents of information transmitted from a vehicle.

FIG. 8 is a flowchart showing an outline of processing of a service allocation processing device 129.

FIG. 9 is a flowchart showing processing until the service allocation processing device 129 determines a service to be provided to each vehicle.

FIG. 10 is a diagram showing to which vehicle each service is provided, which is output during processing in the service allocation processing device 129.

FIG. 11 is a flowchart showing a process performed by the service allocation processing device 129 until a provision priority weight for each vehicle of each provided service is determined.

FIG. 12 is a diagram showing the contents of a contract-time setting priority class comparison table used to determine the contract-time setting priority weight of each vehicle.

FIG. 13 is a table showing a result of comparing contract priority settings between vehicles.

FIG. 14 is a diagram showing the contents of a use-time setting priority class comparison table used for calculating a use-time setting priority weight of each vehicle.

FIG. 15 is a view showing contents of a contract-time setting priority class-use-time setting priority class comparison table.

FIG. 16 is a diagram illustrating information output to the service allocation processing device 129 to which vehicle each service is to be provided, and priority weight information of each service for each vehicle.

FIG. 17 is a diagram showing an example of a frame configuration.

FIG. 18 is a flowchart showing processing in the communication path control device 131.

FIG. 19 is a flowchart showing a part of the processing flow of the communication path control device 131.

FIG. 20 is a diagram showing contents of a slot assignment table referred to in the communication path control device 131.

FIG. 21 is a diagram showing contents of information transmitted from each service provider to the management apparatus 109 on the center side in the second embodiment of the present invention.

FIG. 22 is a flowchart showing processing in the communication path control device 131 according to the fifth embodiment of the present invention.

FIG. 23 is a flowchart showing processing of a service allocation processing device 129 according to the sixth embodiment of the present invention.

FIG. 24 is a diagram showing contents of a vehicle traveling speed comparison table used for calculating a provision priority weight in the sixth embodiment of the present invention.

FIG. 25 is a diagram showing a comparison table of the priority weight w4 calculated from the traveling speed information and the priority weight calculated in the priority weight step 2302 calculated in the first embodiment.

FIG. 26 is a configuration diagram showing a system according to a seventh embodiment of the present invention.

FIG. 27 is a communication path control device according to a seventh embodiment of the present invention.
FIG. 131 is a block diagram showing a process of 131.

FIG. 28 is a configuration diagram showing one of service provision modes using the present invention.

[Explanation of symbols]

101 ... road, 102, 103 ... transmitting / receiving device, 104, 105 ... communication area, 106, 107 ... roadside control device, 108 ... dedicated line or public network connecting the roadside control device and the management device, 109 ... management device, 1
10, 111 ... vehicle, 112, 113, 114, 115 ... service provider, 116, 117, 118, 119 ... service providing device, 120, 1
21, 122, 123 ... priority class setting device, 124 ... dedicated line or public network connecting the service provider and the management device, 12
5: provided service priority determining device, 126: comparison table storage device, 127: roadside provided service priority information storage device, 1
28: Vehicle request service priority information storage device, 129: Service allocation processing device, 130: Service allocation method storage device, 131: Communication path control device, 201 Information transmitted from a service provider, 202: Service identification ID, 203: service name, 204: provided service class, 205: provided priority class, 301: provided priority class comparison table, 401: provided priority class comparison result, 501: display unit of in-vehicle device, 601 ...
Content of packet transmitted from roadside transmitting / receiving device, 701
... information transmitted from a vehicle, 702 ... vehicle ID, 703 ... requested service ID, 704 ... contract setting priority class, 705 ... use setting priority class, 1001 ... table indicating service provided to each vehicle, 1201 … Contract setting priority class comparison table, 1301… Table showing the result of comparing contract setting priorities between vehicles, 1401… Use setting priority class comparison table, 1501… Contract setting priority class- Use-time setting priority class comparison table, 1601: a diagram showing information on which vehicle each service is to be provided to and priority weight information of each service for each vehicle, 1701: frame configuration, 2001: slot assignment table, 2101: A diagram showing the contents of information transmitted from each service provider to the management device 109 on the center side, 2401: Vehicle traveling speed comparison table, 2501: Vehicle traveling speed-priority weight comparison table, 2601 ... Both passage history storage unit, 2602 ... passing communication region prediction apparatus, 2801,28
02, 2803… Transceiver, 2804, 2805, 2806… Service provider.

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (17)

[Claims] An in-vehicle device mounted on a vehicle running on a road, a roadside control device for transmitting information to the in-vehicle device using wireless communication, and a wireless communication between the in-vehicle device and the roadside control device. A transmitting and receiving device for transmitting and receiving information by communication, and a management device of a communication facility manager managing the roadside control device,
The same as a service providing device managed by a service provider that provides a service for transmitting various types of information by wireless communication to vehicles existing in a communication area formed by the roadside control device and connected to the management device; A priority class setting device that sets a priority class to be provided with priority to a plurality of services provided in a communication area, and a service that determines a service priority of each service based on the set priority class A road-to-vehicle communication system comprising: a priority determining device; and a communication channel control device that controls assignment of a communication channel based on the determined priority. 2. The service according to claim 1, wherein the service includes a push-type service provided to at least some of the vehicles existing in the communication area regardless of whether or not there is a request from the vehicle, and a request from the vehicle. And a push-type service provided in accordance with the priority determined by the priority determining means together with a service requested to provide a service from each vehicle. Inter-vehicle communication system. 3. The priority class setting device according to claim 1, wherein the service provider selects the priority class from the priority classes in which a range of values that can be set is determined in advance. A road-to-vehicle communication system, comprising: selecting means for performing the setting; and providing priority class setting means for setting a providing priority class for each provided service using the selected priority class. 4. The storage priority determining device according to claim 3, wherein the provision priority determining device stores, for each priority class, a relative priority size with respect to another priority class, and stores the contents of the storage unit. Comparing means for referencing and comparing the priority class set for each service with the priority classes of all services, and calculating means for determining the eigenvalue and eigenvector of the matrix by regarding the comparison result as a matrix A road-to-vehicle communication system, comprising: 5. A service according to claim 1, wherein a service requested from each vehicle existing in the same communication area during communication exists in the communication area at the same time as another service requested from each vehicle. The priority class setting device capable of setting a priority class indicating how much priority is desired to be provided compared to a service requested from another vehicle,
The priority determining step of determining the service priority of each service based on the service priority class of each service set by the service priority class setting device and the service priority class set by the vehicle. A road-to-vehicle communication system comprising: 6. The push-type service provided to at least some of the vehicles existing in the communication area from the road side regardless of whether or not there is a request from the vehicle. A road-to-vehicle communication system comprising: the priority class setting device capable of setting a priority class for rejecting provision of a service determined not to exist. 7. The vehicle according to claim 5, wherein when the vehicle and the communication facility manager conclude a use contract for enabling each vehicle to use the communication device to enjoy each of the provided services, A road-to-vehicle communication system comprising the priority class setting device capable of setting a priority class for determining whether to receive a service with a higher priority. 8. The priority storage device according to claim 5, wherein the provision priority determining device stores a relative priority size for each priority class set on the vehicle side with respect to another priority class. Means, comparing means for comparing the priority class set for each service with reference to the contents of the storage means with the priority class set for all services, and estimating the comparison result as a matrix and eigenvalues of the matrix. First providing priority determining means for determining the providing priority of the service requested by the vehicle by obtaining an eigenvector, and determining the providing priority and providing priority of the service requested by the vehicle determined by the means Means for deciding service provision priority by multiplying the service provision priority based on the roadside request determined by the means for determining service provision priority. A road-to-vehicle communication system comprising: 9. The provision priority determining device according to claim 7, wherein the service requested from each vehicle existing in the communication area at the time of communication exists in the communication area simultaneously with another service requested from the vehicle. A service provision priority determined based on a priority class that indicates how much priority is required to be provided over services requested by other vehicles, and a service determined based on a priority class set at the time of contract A storage unit for storing a weight value between the provision priority and a service requested by the vehicle by performing weighting of the two service provision priorities using the weight value stored in the storage unit A third provision priority determining means for determining provision priority, and a service provision priority determined by the means and provision priority of each service. A fourth provision priority determining means for determining a service provision priority by multiplying a service provision priority based on a request from a roadside determined by the provision priority determination device according to any one of claims 1 to 4. A road-to-vehicle communication system comprising: 10. The vehicle-mounted device according to claim 1, wherein the on-vehicle device includes information input means for inputting predetermined information for setting a service to be provided, and a priority class for inputting a priority class for the provided service. A road-vehicle communication system comprising: input means; and display means for displaying the input provided service and a set priority class. 11. The priority class setting device according to claim 3, wherein the priority class setting device indicates a priority level of each service provided by the service provider that is to be provided as compared to other services. A road-to-vehicle communication system, wherein a priority class is set based on a traffic class indicating a traffic required to provide each service, instead of setting a class. 12. The service priority determination device according to claim 11, wherein the service priority determined by the service provider is determined based on a traffic class for each service, and a service priority is determined for each service. Storage means for storing a value of a weight between the service provision priority determined based on a priority class indicating how much priority is provided to the service as compared with the service provision priority, and the storage means. A road-to-vehicle communication system comprising: fifth provision priority determining means for determining the provision priority of a service provided from the roadside by weighting the two service provision priorities using a value. 13. The communication path control device according to claim 1, wherein the communication path control device defines a frame including a plurality of slots as a communication path for performing data communication.
A service with the highest provision priority is selected from one or a plurality of services to be provided to each vehicle, and one of empty slots to which no data is assigned to the service is assigned, and there is no empty slot. By repeating the above operation for each vehicle until the empty slot is exhausted, by changing the transmission cycle of the slot to which the service with the lowest provision priority among the services provided to each vehicle is assigned A service providing system for road-vehicle communication, comprising: slot allocating means for allocating to a slot, wherein at least one slot is allocated to each vehicle. 14. The communication path control device according to claim 13, wherein, after allocating at least one slot to each vehicle, if there is still an empty slot, the communication priority A road-to-vehicle communication system, comprising: slot allocation means for allocating slots in ascending order of service. 15. The communication path control device according to claim 1, wherein the communication path control device sets a maximum number of services that can be provided in one communication area, and allocates the maximum number of services to available slots in the order of service having the highest priority. When there are no more empty slots, the transmission cycle is changed in the order of service having the lower priority among the provided services, the service is allocated to the changed slot, and the operation is repeated until the maximum number of services that can provide the operation is reached. A road-to-vehicle communication system, comprising: slot allocation means for allocating a service to a slot according to (1). 16. The vehicle-mounted device according to claim 1, further comprising a traveling speed transmitting means for transmitting a traveling speed of the vehicle, and wherein the provision priority determining device is transmitted from the traveling speed transmitting means. Priority class setting means for setting a priority class to be provided based on traveling speed information, and comparing the priority classes set by the means between vehicles to determine a service priority based on traveling speed. Sixth provision priority determining means for determining, and storage for storing a weight value between the provision priority of the service determined by the provision priority determining device and the provision priority of the service based on the traveling speed. Means, and seventh provision priority determining means for determining service provision priority by weighting the two provision priorities using values stored in the storage means. Vehicle communication system characterized in that there was e. 17. A vehicle traffic history storage means according to any one of claims 1 to 16, wherein said vehicle traffic history storage means stores position information and a communication time of a communication area with which each vehicle has communicated up to now. A communication area prediction unit for predicting a communication area through which the vehicle will pass next based on the position information and the time information; Updating means for updating the service providing priority class or the set priority class transmitted from the vehicle, an ID for identifying the vehicle in the communication area predicted by the predicting means, the remaining data to be transmitted to the vehicle, and A transfer unit that transfers the updated provision priority class and the management device that manages the predicted communication area; and the transferred priority when the vehicle reaches the predicted communication area. A road-to-vehicle communication system, comprising: the provision priority determining device that determines a service provision priority based on a degree class.