WO2004089008A1 - Radio comunication system - Google Patents

Abstract

A radio communication system including base stations that distribute predetermined data by radio so as to be received by mobile terminals located within the communication area of a base station. This system comprises a management means for managing communication area information on the communication area of each of the base stations, a communication area information providing server to which the communication area information is sent from each of the base stations a mobile terminal that has, a radio communication unit for receiving communication area information sent from each of the base stations depending on the position of the mobile terminal and boots up an application program to be used in the communication area which the mobile terminal approaches according to this received communication area information.

Description

Wireless Communication V Technical Field

 The present invention relates to a technology related to a short-range communication (DSRCr Dedicated Short Range Communications), which is a wireless communication method used for an intelligent transportation system (ITS intelligent transport systems) and the like. Akita

Background art

 DSRC is a system for moving and stationary mobile objects, and is provided by a base station installed on the roadside as a spot (narrow area) wireless communication area (several meters to several tens of meters) This is a system that allows users to use a variety of services via an on-board device and an HMI installed mainly in the vehicle.

 At present, the DSRC is actually operated as an ETC system, and users attach an on-board ETC dedicated vehicle to vehicles and use it for automatic toll collection on toll roads. In the future, DSRC will be a wireless communication system that can provide multi-services such as traffic information provision services, surrounding area information provision services, parking lot use services, payment at convenience stores and gas stations, and Internet services. Is expected.

 At this time, what is required is a mobile terminal such as a “general-purpose vehicle-mounted device” that can support multi-services in terms of installation space and cost.

 As mentioned above, the DSRC system was previously an ETC (single) service (system) using an ETC dedicated on-board unit. Therefore, the on-board equipment system requirements were as follows.

Installed application: "ETC only" (no need to support multiple applications). Wireless line: The modulation method is ASK / lMbps (1 type) and the frequency is 2 waves (search and selection are required). Communication area: The installation location is the entrance gate of the tollgate, and it is necessary to notify the user of the ETC lane. As a concrete conventional example, there is an ETC on-board device linked with a car navigation system (for example, see Patent Document 1).

 Patent Document 1

 Japanese Unexamined Patent Publication No. 2000-1 13 4 7 9 4

 In this vehicle-mounted device, when approaching the ETC lane, information on the toll gate (location of the ETC lane) and the frequency information to be used in the lane (Ach, Bch / 2-wave, Or get This allows the HMI to guide (guide) the user to the ETC lane (communication area) and to set the frequency value to be used in the area to the radio before entering the area. This eliminates the need for a frequency search circuit and software that requires, and eliminates the need for frequency selection processing (time) when entering the area, thus enabling efficient communication within the area.

 In addition, the tollgate information and frequency information of these car navigation systems are stored together with the map data as information linked to the electronic map data, and it is not easy to update the information.

 As described above, systems that implement a single ETC service and dedicated on-board devices have been provided. However, when multi-applications are applied to the DSRC system in the future, there are the following problems that conventional technologies cannot address.

 In other words, when multi-applications are applied to the DSRC system, there will be multiple application programs installed in the on-board device, and resource shortage such as an increase in CPU load due to congestion of application programs is assumed. Disclosure of the invention

 An object of the present invention is to provide a technique for efficiently using resources in order to suppress an increase in hardware scale.

The present invention has been made in order to solve the above-mentioned problems. What is claimed is: 1. A wireless communication system including a plurality of base stations to be distributed, comprising: management means for managing communication area information relating to a communication area of each base station; and provision of communication area information for distributing said communication area information from each of said base stations. A server, and a wireless communication unit that receives communication error information distributed from each of the base stations in accordance with its own location, based on the received communication error information, an application to be used in the communication error approaching by itself. And a mobile terminal that activates the Yon program.

 According to the present invention, only an application program to be used in a communication error approaching a mobile terminal is automatically started, so that resources can be used efficiently.

 In the wireless communication system, for example, the mobile terminal activates the aggregation program before reaching the communication error to which the mobile terminal approaches.

 By doing so, it becomes possible to start the application program before the mobile terminal reaches the approaching communication error.

 Further, in the wireless communication system, for example, the mobile terminal sets communication parameters to be used in a communication error approaching to the mobile terminal in the wireless communication unit.

 In this way, even if the number of wireless links becomes diversified (for example, the number of frequency channels increases), it is possible to select or specify them appropriately.

 Further, in the wireless communication system, for example, the mobile terminal sets the communication parameters before reaching a communication error to which the mobile terminal approaches. .

 In this way, the communication parameters can be set before the mobile terminal reaches the approaching communication area.

 In the wireless communication system, for example, the mobile terminal stops an active application. For example, the application is stopped or terminated when the mobile terminal passes through the approaching communication area.

In this way, resources can be used efficiently. In the wireless communication system, for example, the communication area information providing server distributes, from each of the base stations, at least communication error information relating to a communication error near a communication error of the distribution source base station.

 In this way, the user can quickly use the service he / she wants to use near the current location.

 In the wireless communication system, for example, the communication area information providing server distributes at least the communication error information relating to the communication error of the base station providing the same kind of service from each of the base stations.

 In this way, the user can grasp the location of the base station that provides the same kind of service.

 Further, in the wireless communication system, for example, the communication area information providing server distributes, from each of the base stations, communication error information on a communication error in an area corresponding to at least a user-specified position.

 In this way, the user can obtain desired communication error information. Further, the present invention can be specified as a mobile terminal as follows. A mobile terminal included in a wireless communication system including a plurality of base stations for distributing predetermined data by radio for the purpose of being received by a mobile terminal located in its own communication area, wherein A wireless communication unit that receives communication area information distributed from a base station according to its own position, a storage unit that stores communication area information received by the wireless communication unit, and a communication area that is stored in the storage unit A mobile terminal, comprising: a determination unit that determines an application program to be used in a communication area to which it is approaching based on information; and a program activation unit that activates the application program determined by the determination unit.

 In the mobile terminal, for example, the program activating unit activates the application program before reaching a communication error to which the mobile terminal approaches.

The mobile terminal further includes, for example, a setting unit that sets a communication parameter to be used in a communication area to which the mobile terminal approaches, in the wireless communication unit. You.

 In the mobile terminal, for example, the setting unit sets the communication parameters before reaching the communication carrier to which the mobile terminal approaches.

 The present invention can be specified as a communication error information providing server as follows.

 A communication area information providing server included in a wireless communication system including a plurality of base stations for distributing predetermined data wirelessly for the purpose of being received by a mobile terminal located in its own communication area, A communication area information providing server, comprising: management means for managing communication area information relating to the communication area of each base station; and means for distributing the communication area information from each of the base stations.

 Further, the present invention can be specified as an invention of a program or an invention of a recording medium on which the program thereof is recorded. BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is a diagram for explaining a schematic system configuration of a wireless communication system according to an embodiment of the present invention.

 FIG. 2 is a diagram for describing an example of the arrangement of communication errors in each base station.

 FIG. 3 is a partially enlarged perspective view of FIG. 2 and is a diagram for describing in detail an example of the arrangement of each base station and their communication errors.

 FIG. 4 is a diagram for describing an example of communication area information.

 FIG. 5 is a diagram for describing an example of user information.

 FIG. 6 is a flowchart for explaining the operation of the wireless communication system according to the present embodiment.

FIG. 7 is a flowchart for explaining the operation of the wireless communication system according to the present embodiment. BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a wireless communication system (also referred to as a multi-application DSRC system) according to an embodiment of the present invention will be described with reference to the drawings.

 FIG. 1 is a diagram for explaining a schematic system configuration of a wireless communication system according to an embodiment of the present invention. FIG. 2 is a diagram for explaining an example of arrangement of communication areas of each base station. FIG. 3 is a partially enlarged perspective view of FIG. 2, and is a diagram for explaining in detail an example of the arrangement of each base station and their communication error.

 (Schematic system configuration of wireless communication system)

 As shown in FIG. 1, the wireless communication system according to the present embodiment includes a plurality of base stations (A1 to A1, B1 to: Bm, Cl to Cn, Dl to Dp, El to Eq), a communication area information providing server. 100, a mobile terminal 200, and various information providing servers S1 to S5.

 Each base station (A1 to A1, B1 to: Bm, Cl to Cn, Dl to Dp, El to Eq) is provided for the purpose of being received by the mobile terminal 200 located in its own communication area. It is for providing (distribution, transmission, or broadcast transmission) data (data related to prescribed services, communication area information, etc.).

 Communication errors (ΑΓ to ΑΓ, Bl 'to Bm, Cl, to Cn, Dl, to Dp, and El' to Eq ') of each base station are provided as spots by the DSRC wireless communication system. (See Fig. 2 and Fig. 3). Hereinafter, the communication area is indicated by adding 'to the code indicating the corresponding base station. For example, the communication area of base station A 1 is represented as communication area A 1. Others are the same.

 As shown in FI G.2 and FI G.3, each base station (A1-A1, Bl-Bm, Cl-Cn, Dl-Dp, El-Eq) is installed on the roadside, such as the road shoulder. . For example, the base stations A1 to A1 and Bl to Bm are installed on road shoulders. Base stations Cl to Cn are installed in the parking lot. Base stations Dl to Dp are installed in gasoline stand GS. Base stations El to Eq are installed in a convenience store parking space.

As shown in FI G.1, each base station (A1-A1, Bl-Bm, Cl-Cn, In Dl to Dp, El to Eq), various information providing servers S1 to S5 such as traffic information providing servers and communication area information providing server 100 are connected to the Internet, a public telephone line network, or a dedicated network. It is connected via a telecommunication line such as a line.

 Each base station (A1 to A1, Bl to Bm, Cl to Cn, Dl Dp, El to Eq) provides a predetermined service supplied from each of the weekly information providing servers S1 to S5 via such a network. Distribute data about For example, the base stations Al to A1 provide a traffic information providing service (data related to traffic information and the like) supplied from the traffic information providing server S1. Base stations B1 to: Bm provides the peripheral information providing service (data related to the peripheral information, etc.) supplied from the peripheral information providing server S2. The base stations Cl to Cn provide the parking lot use service (data about the parking lot, etc.) supplied from the parking lot management server S3. The base stations Dl to Dp provide GS use services (such as data related to GS) supplied from the GS server S4. The base stations El to Eq provide convenience store use services (such as data on convenience store) supplied from the convenience server S5.

The communication area information providing server 100 mainly stores communication area information regarding the communication area of each base station (A1 to A1, B1 to: Bm, Cl to Cn, Dl to Dp, El to Eq), a network, etc. To each base station (A1 to A1, Bl to Bm, Cl to Cn, Dl to Dp, El to Eq), and to each base station (A1 to A1, Bl to Bm, CI to Cn, Dl to Dp , El to Eq). For example, the _c communication area information providing server 100, which is an information processing terminal such as a personal computer or a workstation, is provided with a base station (A1 to A1, B1 to: Equipped with an internal or external storage device to manage and accumulate communication error information (latest information unique to communication errors) for communication errors of Bm, Cl to Cn, Dl to Dp, El to Eq) for each area. ing.

 FIG. 4 is a diagram for describing an example of communication area information.

As shown in the figure, the communication area information is the latest information peculiar to the communication area for each area (ΑΓ to ΑΓ, ΒΓ to Βπι ', Cl, to Cn', Dl, to Dp, and ΕΓ to Εα,). is there. The communication area information is always updated to the latest information by manual input by an operator or the like or automatic input from an information processing terminal such as an external server. Whether or not it is the latest can be determined by the area information version.

 The communication area information is composed of basic information, area information, communication information, and application information.

 The basic information includes items such as communication area identification information and area information version number. In the communication area identification information, information unique to the base station for identifying the communication area of each base station is set (or registered). In the area information version number, information indicating the new or old of the corresponding communication area information, for example, an update date and time is set.

 Area information includes items such as operating status, installation attributes, area start position, and end area position. In the operation status, information indicating the operation status of the corresponding base station (service availability, etc.) is set, for example, operation or non-operation. In the installation attribute, information indicating the installation location of the corresponding base station, for example, road or facility is set. In the area start position, information indicating the start position of the communication area of the corresponding base station, for example, latitude / longitude is set. In the area end position, information indicating the end position of the communication area of the corresponding base station, for example, latitude / longitude is set.

 The communication information includes items such as carrier frequency information, a modulation / demodulation method, and a transmission speed. In the carrier frequency information, information for specifying the carrier frequency (channel) of the corresponding base station is set. In the modulation / demodulation method, information for specifying the modulation / demodulation method of data distributed from the corresponding base station is set. In the transmission speed, information for specifying the transmission speed of data distributed from the corresponding base station is set.

The application information includes items such as traffic information service, neighborhood information service, parking lot use service, GS store service, and convenience store service. These items are for identifying the service (data related to the specified service) provided by the corresponding base station. example For example, “Yes” is set for the traffic information service corresponding to base station A1. This indicates that base station A1 provides a traffic information service. On the other hand, "None" is set for the traffic information service corresponding to base station B1. This indicates that base station B1 does not provide a traffic information service. The mobile terminal 200 transmits predetermined data (data related to a predetermined service, communication area information, etc.) distributed from each base station (A1 to A1, B1 to Bm, Cl to Cn, D1 to Dp, El to Eq). It is for receiving various data according to its own position (current position) and performing various processing (eg, starting or stopping an application) based on the predetermined data. For example, a general-purpose vehicle-mounted device installed in a vehicle is there.

 The mobile terminal 200 includes a CPU 201 that controls the entire operation thereof, a wireless communication unit 202, a storage unit 203, and a control unit 20 that are connected to the CPU 201 via a path or the like. 4. It has a position detection section 205, an input section 206, an HMI (Human Machine Interface) section 207, and a memory 208.

 The wireless communication unit 202 is for performing data communication with each base station. In the present embodiment, a wireless communication device that can support ASK 1 Mbps and QPSK 4 Mbps is used.

The storage unit 203 stores a predetermined OS (Operating System), a plurality of programs executed on the OS (programs for using each application, etc.), communication area information (see FIG. 4), user information (see FIG-. 5), and is for storing electronic map information and the like, for example, _c still readable and writable storage device such as a hard disk device Ya flash memory, for the map information, the mobile When a car navigation system is installed in the terminal 200, it is possible to share the map information of the car navigation system.

 FIG. 5 is a diagram for describing an example of user information.

As shown in the figure, user information is composed of user information, application information, and service use location search conditions. These pieces of user information are input by the user from the input unit 206, for example. In the user information, a user ID (identification information) for identifying the user is set. The application information includes the items of traffic information service, surrounding information service, parking lot use service, and convenience store service. These items are for identifying the service that the user wants to use. For example, “unnecessary” is set for the parking lot use service and convenience store service, indicating that the user does not want to use these services. On the other hand, “necessary” is set for the traffic information service, peripheral information service, and GS store service, indicating that the user wants to use these services.

 The service use place search conditions include designated place location information and search range. The latitude and longitude of the current location or the designated location are set in the designated location location information. The distance from the specified position is set in the search range.

 The control processing section 204 is mainly for performing the processing shown in FIG. 6. A predetermined program is read from the storage section 203 (to the memory 208), and the control section 204 executes the processing shown in FIG. It is realized by being executed.

 The position detecting unit 205 detects the current position of the mobile terminal 2000 (or the vehicle on which the mobile terminal 2000 is mounted), and includes, for example, a GPS receiver.

 The input unit 206 is used for inputting and changing user information, inputting various commands or information, and the like. For example, a voice recognition device for performing voice input, input by key operation of a key set, or the like. Device.

 The HMI unit 207 is for displaying the location information of the communication area on a screen or by sound, and includes, for example, an image display device such as a liquid crystal display or a CRT display, and an audio output device such as a speed output. Includes output section.

 Next, the operation of the wireless communication system having the above configuration will be described with reference to the drawings. FIG. 6 is a flowchart for explaining the operation of the wireless communication system according to the present embodiment.

Hereinafter, as shown in FIG. 2 and FIG. 3, the mobile terminal 200 is installed. An operation example when the mounted vehicle V moves from the position P0 to the position P1 will be described.

 In the following description, the communication area information providing server 100 transmits information from each base station (A1 to A1, Bl to Bm, Cl to Cn, Dl to Dp, El to Eq) to its base station (distribution base station). The communication information about the communication area near the communication area is distributed as peripheral information. For example, the communication area information providing server 100 sends a communication area A1 of the base station A1 (a distribution base station) from a base station A1 shown in FIG. The communication area information on C l ′, D l, and E 1 ′ is distributed as peripheral information. For such peripheral information distribution, the communication area information providing server 100 communicates with the communication area (for example, communication area Α ') of the distribution base station (for example, base station A) and the communication area (for example, Communication areas B1, C1, D1, D1, and E1, are held. Therefore, the communication area information providing server 100 can determine the communication area near the communication area of each base station (distribution base station), and the communication area information about the communication area near the communication area from each base station. It is possible to distribute information.

 As shown in FIG. 3, a communication area A 1 ′ is provided by the base station A 1 on the route from the position P 0 to the position P 1. As described above, the base station A 1 transmits the traffic information providing service (data related to traffic information, etc.) and the communication area information (peripheral information) to the mobile terminal 200 located in the communication area A 1 ′. Provided for the purpose of being received. Also, as shown in FIG. 5, the mobile terminal 200 holds user information for which the traffic information service “necessary” is set.

Therefore, when the vehicle V is located in the communication error A1 in the process of moving from the position P0 to the position P1, the mobile terminal 200 is connected to the traffic information providing service (data related to traffic information, etc.). Receives communication area information (peripheral information). This communication area information (peripheral information) includes communication area information on communication areas Bl, Cl ', Dl, and E1, in the vicinity of communication area A1' of base station A1 (distribution base station). It is. These received information is stored in your own memory Stored in section 203.

 Note that the mobile terminal 200 already stores in its storage unit 203 the communication area information (area information B 1 ′, C 1 \ D l ′, and Ε Ι ′) received in the communication area A 1 ′. If stored, update to the latest information and store. Specifically, the control unit 204 compares the received communication area information (area identification information and information version number) with the already stored communication area information (area identification information and information version number). I do. Then, as a result of the comparison, when the control unit 204 determines that the received communication error information is the latest, the control unit 204 stores the received communication error information (for example, overwrites). As a result, even if a large number of diverse communication areas (base stations) are scattered, and even if the area increases / decreases, service contents and operating conditions change at any time, the latest communication area position and service contents Can be notified to the user. At this point, it is assumed that the communication unit information shown in FIG. 4 is stored in the storage unit 203 of the mobile terminal 200.

(Nearby area search processing)

 Next, the operation after the vehicle V has passed through the communication area A1, will be described with reference to FIG. The following process is a process for searching for a nearby area that provides the service that the user wants to use, and notifying the user of this.

 When the vehicle V passes through the communication area A1 ', the control unit 204 refers to the user information stored in the storage unit 203 and searches for a service that the user wants to use (S 1 0 0). Here, as such services, traffic information services for which “necessary” is set among user information (application information), 'peripheral information services, and GS services are searched (see FIG. 5). ) (S101: Yes).

Next, the control unit 204 refers to the communication area information (including the updated communication area information) stored in the storage unit 203, and is used by the user searched in S101. Services you want to do (traffic information services, nearby Search for a communication error providing information service and GS service (S102). Here, as such communication areas, communication areas A1, A1, B1, Bm, Dl, and Dp are searched (see FIG. 4) (S103: Yes ;).

 Next, the control unit 204 determines whether or not the service use location search condition is set as the user information '(S105). Here, as shown in FIG. 5, since the service use location search condition is registered as user information (S105: Yes), the control unit 204 detects the position in S104. Based on the current position detected by the means 205 (or read from the position detecting means 205) and the service use place search conditions shown in FIG. 5, the communication area A l searched in S 102 , A l, B l, B m, D l, and D p are searched (selected) again for the communication area corresponding to the search condition (S 106).

 For example, when the latitude and longitude of the current position are set in the user information (designated location position information), the control unit 204 sets the user information (search range) from the current position. Search the communication area within the range again. Here, it is assumed that the communication areas Bl and D1 are extracted as a result. If the latitude and longitude of the specified position are set in the user information (specified location position information), the communication error exists within the range set in the user information (search range) from the specified position. Is searched again.

 When the communication areas Bl and D1 corresponding to the search condition are extracted (S107: Yes), the control unit 204 selects the communication areas B1 and B1 extracted by the HMI unit 207. , D1 is notified and guided to the user (S108). For example, a voice that guides those places is output from an in-vehicle speaker. Or, display those locations on a display screen such as a liquid crystal display (for example, a map screen).

As a result, the user can know the existence of the neighboring information service providing area B 1 and the GS service providing area D 1 in the vicinity, and can head toward these areas. (Application program startup processing, etc.)

 Next, a description will be given of a process of activating an application that should be used (necessary) before reaching the searched and notified peripheral error.

 The control unit 204 determines a communication area located at the shortest distance from the current position among the communication areas B1 and D1 extracted in S106 (S109). Specifically, the communication error which is located at the shortest distance in a straight line from the current position is determined. Alternatively, a route search is performed from the current position to each of the communication areas B1 and D1 extracted in S106, and the communication area with the shorter reach is determined. In this embodiment, the communication area B1 is determined as the communication area located at the shortest distance from the current position, as is clear from FIG.

 When the communication area B1 located at the shortest distance is determined, the control unit 204 calculates the distance between the current position and the communication area B1 (area start position) (S110). Then, the control unit 204 calculates the time required to reach the communication area B1 (remaining distance / vehicle speed, etc.) and y (time required to start the application program, time required to set the radio unit, and time). (S 1 ll: No, S 104 force, et al. S ll).

 When the time required to reach the communication area B1 falls below y (S111: Yes), the control unit 204 should use (necessary) an application program to be used in the communication area B1. Is started (S1 1 2). Specifically, the control unit 204 refers to the communication area information stored in the storage unit 203, determines an application program to be used in the communication area B1, and starts the application program. Move.

For this application program determination and start, the mobile terminal 2 0 0, _c for example each communication Eria and the data specifying the application program to be activated in the communication Eria holds data associated, FI The communication area identification information and application information and information shown in G.5 correspond. In the figure, the application corresponding to communication area B1 is shown. “Yes” is set for the peripheral information service in the session information. This indicates that the application program to be started in the communication area B1 is an application program for using the peripheral information service. Therefore, the control unit 204 refers to the communication area information stored in the storage unit 203 so that the application program to be started in the communication area B1 can use the peripheral information service. It is possible to determine that it is a program and start it. Next, the control unit 204 refers to the communication area information stored in the storage unit 203 and determines the communication information (QPSK'4M, CH7) to be used in the communication area B1. This is set (notified) to the wireless communication unit 202 (S113).

 For this setting, the mobile terminal 200 holds data in which each communication area is associated with communication information to be set in the communication area. For example, the communication area identification information and the communication information shown in FIG. In the figure, QPSK 4M and CH7 are set as communication information corresponding to communication area B1. This indicates that the communication information to be used in the communication area B1 (that is, the communication information to be set in the wireless communication unit 202) is QPSK '4M and CH7. Therefore, the control unit 204 determines that the communication information to be used in the communication area B1 is QPSK4M and CH7 by referring to the communication error information stored in the storage unit 203. However, this can be set for the wireless communication unit 202.

 As a result, before reaching the communication area B 1 ′, the mobile terminal 200 performs the processing for using the service provided by the communication area B l, (starting the application program and setting the communication information). This can be done in advance. In addition, even if the number of wireless links is diversified (the number of frequency channels is increased), it will be possible to select or specify them appropriately.

As described above, the base station B 1 transmits the peripheral information service (data related to peripheral information, etc.) supplied from the peripheral information providing server S 2 and the communication area information (peripheral information) supplied from the communication area information providing server 100. Information) and the Provided (distributed) for the purpose of being received by the mobile terminal 200 located in the communication area B 1 ′. Further, as shown in FIG. 5, the mobile terminal 200 holds user information for which the peripheral information service “necessary” is set.

 Therefore, if the vehicle V is located in the communication area B1 (enters) (S114: Yes), the mobile terminal 200 receives the received signal (peripheral information service (peripheral information service) provided from the base station B1). Information related data) and communication area information (peripheral information)) are received promptly (S115). The received information is stored in its own storage unit 203. As a result, in the mobile terminal 20.0, the peripheral information service can be used by the application program started earlier.

 If the communication terminal information received in the communication area B 1 ′ has already been stored in its own storage unit 203, the mobile terminal 200 updates and stores the latest information. Specifically, the control unit 204 compares the received communication area information (area identification information and information version number) with the already stored communication area information (area identification information and information version number). Then, it is determined whether or not the received communication area information is the latest (S116). When the control unit 204 determines that the received communication area information is the latest as a result of the comparison, the control unit 204 stores the received communication area information (for example, overwrites) (S117) ).

 (Application program termination processing)

 Next, the process of terminating (stopping) the application program started earlier will be described.

The control unit 204 compares the current position sequentially detected by the position detection unit 205 with the area end position of the communication area B 1 ′ (S 118). Then, when the control unit 204 determines that the vehicle V has passed the communication area Bl, as a result of the comparison (S118: Yes), the application program started earlier (ie, The application program for using the peripheral information service in the communication area B1 'is stopped (S119). For example, The area on the memory 208 where the application program is read is released. On the other hand, as a result of the comparison, the control unit 204 determines that the vehicle V has not passed through the communication area B 1 ′ (S 118: No), and does not determine that the use of the service has ended. In this case (S120: No), the processing from S115 to S118 is repeated. Then, the control unit 204 determines that the vehicle V has not passed through the communication area B 1 ′ (S 118: No), and determines that the service has been used (S 120 : Yes), the application program started earlier (that is, the application program for using the peripheral information service in the communication area Bl,) is stopped (S119). For example, the area on the memory 208 where the application program is read is released.

 As described above, according to the wireless communication system of the present embodiment, it is possible to start an application to be executed by a communication error before reaching the communication error, and furthermore, when an application passes through the communication area. It is possible to stop the previously started application (ie, before reaching the next communication error). Therefore, each time the application arrives at the communication area, the application is successively started up, thereby preventing the erosion of the memory area. Therefore, the wireless communication system according to the present embodiment can be realized by mounting a smaller-capacity memory in the mobile terminal.

 (Modification)

 Next, a modified example of the above embodiment will be described.

In the above embodiment, the communication area information providing server 100 sends the information from each base station (A1 to A1, B1 to: Bm, Cl to Cn, Dl to Dp, El to Eq) to the base station (distribution source). Although the communication area information on the communication area near the communication area of the base station has been described as being distributed, the present invention is not limited to this. For example, the communication area information providing server 100 is connected to another base station that provides the same kind of service from each base station (A1 to A1, B1 to Bm, C1 to Cn, D1 to Dp, E1 to Eq). May be distributed. example For example, the communication area information providing server 100 communicates with the communication area (（2, Α 3,... A 1) of another base station (提供 2, Α 3,. A2 ', A3, · · · · A1') Communication area information may be distributed. For such distribution, the communication area information providing server 100 communicates with the base station communication area (eg, A2, Α3,...) That provides the same kind of service as the distribution base station (eg, base station A). · · Hold data associated with A 1). In this way, the above distribution is possible. Other processes are the same as those from S100 to S120 described with reference to FIG. 6, and thus description thereof will be omitted.

 Also, in the above embodiment, the communication-error-information providing server 100 sends from each base station (A1 to A1, B1 to: Bm, Cl to Cn, Dl to Dp, El to Eq) the base station (distribution source). It has been described that the communication area information on the communication area near the communication area of the (base station) is automatically distributed (regardless of a request from a user or the like), but the present invention is not limited to this.

For example, the communication relay information providing server 100 may provide the communication relay information relating to the communication relay requested by the mobile terminal 200 from the base station. Specifically, it is as follows. For example, as shown in FIG. 7, the mobile terminal 200 is made to input a communication area information update request (request) from the input section 206 thereof, and the communication area providing server 100 is transmitted via the base station. Send to 0. The communication area information update request includes service information specifying a service that the user wants to use, a current position (or a user-specified position), and a search range (eg, distance) from the current position (or a user-specified position). ). When the communication area information providing server 100 receives the communication area information update request (S200), the communication area information providing server 100 determines from its own communication area information that the communication area information matches the request (for example, corresponding to a user-specified position). (S210), and provides this to the requesting mobile terminal 200 via the base station (S202). The other processes are the same as those from S100 to S120 described with reference to FIG. 6, and thus description thereof is omitted. The present invention may be embodied in various other forms without departing from its spirit or essential characteristics. Therefore, the above-described embodiment is merely an example in every aspect, and is not to be construed as limiting. Industrial applicability

 As described above, according to the present invention, resources can be used efficiently. In addition, the user can use a mobile terminal such as a general-purpose in-vehicle device to quickly find an area providing a desired service from among diversified and scattered communication areas and use the service. In addition, it is possible to realize a highly convenient DSRC multi-application system.

Claims

The scope of the claims  1. A wireless communication system including a plurality of base stations for distributing predetermined data by radio for the purpose of being received by a mobile terminal located in its own communication area,  Management means for managing communication error information relating to the communication error of each base station;  A communication area information providing server that distributes the communication area information from each of the base stations;  A wireless communication unit that receives communication error information distributed from each of the base stations in accordance with its own position; and based on the received communication error information, an application program to be used in a communication error approaching by itself. A mobile terminal to be activated, A wireless communication system comprising: 2. The wireless communication system according to claim 1, wherein the mobile terminal activates the application program before reaching a communication area to which the mobile terminal approaches. ' 3. The wireless communication system according to claim 1, wherein the mobile terminal sets communication parameters to be used in a communication area to which the mobile terminal approaches, in the wireless communication unit. 4. The wireless communication system according to claim 3, wherein the mobile terminal sets the communication parameters before reaching a communication area to which the mobile terminal approaches. 5. The wireless communication system according to claim 1, wherein the mobile terminal stops the running application. 6. The communication area information providing server has at least the communication of the distribution base station. The wireless communication according to any one of claims 1 to 5, wherein communication base information related to a communication area near the communication area is distributed from each of the base stations. 7. The wireless communication according to any one of claims 1 to 5, wherein the communication area information providing server distributes, from each of the base stations, communication error information on a communication error of at least a base station providing the same kind of service. 8. The wireless communication V according to any one of claims 1 to 5, wherein the communication area information providing server distributes, from each of the base stations, communication error information on at least a communication error in an area corresponding to a user-specified location. 9. A mobile terminal included in a wireless communication system including a plurality of base stations that distribute predetermined data wirelessly for the purpose of being received by a mobile terminal located in its own communication area,  A wireless communication unit that receives communication error information distributed from each of the base stations according to its own position,  A storage unit that stores communication area information received by the wireless communication unit; and a determination unit that determines an application program to be used in a communication area to which the mobile terminal approaches based on the communication area information stored in the storage unit. A program activating unit that activates the application program determined by the determining unit; A mobile terminal comprising: 10. The mobile terminal according to claim 9, wherein the program activation unit activates the application program before reaching a communication area to which the program activation unit approaches. 11. The mobile terminal _{c according} to claim 9, further comprising a setting unit that sets communication parameters to be used in a communication area to which the mobile terminal approaches in the wireless communication unit. 12. The mobile terminal according to claim 11, wherein the setting unit sets the communication parameters before reaching a communication area to which the setting unit approaches. 13. A communication area information providing server included in a wireless communication system including a plurality of base stations for distributing predetermined data wirelessly for the purpose of being received by a mobile terminal located in its own communication area. Management means for managing communication area information relating to the communication area of each base station;  Means for distributing the communication area information from each of the base stations, A communication relay information providing server provided with: