JP2006303977A - Road-to-vehicle communications apparatus - Google Patents

Road-to-vehicle communications apparatus Download PDF

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JP2006303977A
JP2006303977A JP2005123709A JP2005123709A JP2006303977A JP 2006303977 A JP2006303977 A JP 2006303977A JP 2005123709 A JP2005123709 A JP 2005123709A JP 2005123709 A JP2005123709 A JP 2005123709A JP 2006303977 A JP2006303977 A JP 2006303977A
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reservation
access point
vehicle
data communication
communication
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JP4635696B2 (en
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Keisuke Okamoto
圭介 岡本
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Toyota Motor Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a road-to-vehicle communications apparatus, capable of positively performing required data communication at access points on a set route. <P>SOLUTION: The apparatus has an access point detecting means 12 for searching a traveling route, based on the input of a destination, setting the optimum traveling route as a set route, and detecting an access point for road-to-vehicle communication existing on the set route; a communication-enable time calculation means 14 for calculating a time zone, in which data communication can be performed when passing through the detected access points; a data communication reserving means 15 for reserving data communication of the time zone, in which the data communication can be performed at the detected access point; a reservation state registering means 23, in which reservation state per time in each access point is registered; and a reservation management means 24 for referring to the reservation state registering means, when an reservation is made from the data communication reservation means to determine whether the reservation can be made; and if it can be made, registering the reservation in the reservation state registering means to manage the reservation. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、路車間通信装置に係り、特に、車両と路側のアクセスポイント間でデータ通信を行う路車間通信装置に関する。   The present invention relates to a road-vehicle communication apparatus, and more particularly, to a road-vehicle communication apparatus that performs data communication between a vehicle and a roadside access point.

ＩＴＳ（高度道路交通システム）の実現に不可欠な通信技術としてＤＳＲＣ（Ｄｅｄｉｃａｔｅｄ Ｓｈｏｒｔ Ｒａｎｇｅ Ｃｏｍｍｕｎｉｃａｔｉｏｎ）等の路車間通信技術の開発が進められている。   Road-to-vehicle communication technology such as DSRC (Dedicated Short Range Communication) is being developed as a communication technology indispensable for realizing ITS (Intelligent Road Traffic System).

例えば、特許文献１には、カーナビゲーションシステムの経路情報から次の通信エリアまでの距離を取得し、車速、渋滞情報等から車両が次の通信エリアに到達する時刻を算出し、車両到達時刻までに通信準備を行う路車間通信システムが記載されている。
特開２００２−２７１８２９号公報 For example, in Patent Document 1, the distance from the route information of the car navigation system to the next communication area is acquired, the time when the vehicle reaches the next communication area is calculated from the vehicle speed, traffic jam information, etc. Describes a road-to-vehicle communication system that prepares for communication.
JP 2002-271829 A

特許文献１に記載の技術では、各通信エリアにおける通信の混雑状況が考慮されていない。このため、車両が各通信エリアに到達しても、その通信エリアで他の多くの車両が既にデータ通信を行っているような場合、回線が既に使用されているために、必要なデータ通信を行うことができないおそれがあるという問題があった。   In the technique described in Patent Document 1, the congestion state of communication in each communication area is not considered. For this reason, even if the vehicle reaches each communication area, if many other vehicles are already performing data communication in that communication area, the necessary data communication is performed because the line is already in use. There was a problem that could not be done.

これは、無線ＬＡＮなどの場合、各通信エリアでアクセスポイントに接続可能な車両数に制限があり、アクセスポイントに接続する車両数が増えるとスループットが低下するためである。   This is because, in the case of a wireless LAN or the like, the number of vehicles that can be connected to an access point in each communication area is limited, and the throughput decreases as the number of vehicles connected to the access point increases.

本発明は、上述の点に鑑みてなされたものであり、設定ルート上のアクセスポイントにおいて必要なデータ通信を確実に行うことができる路車間通信装置を提供することを目的とする。   The present invention has been made in view of the above-described points, and an object thereof is to provide a road-to-vehicle communication apparatus that can reliably perform necessary data communication at an access point on a set route.

本発明の路車間通信装置は、目的地の入力に基づいて走行ルートを探索して最適な走行ルートを設定ルートに設定し、前記設定ルート上にある路車間通信用のアクセスポイントを検出するアクセスポイント検出手段と、
検出されたアクセスポイントを通過する際にデータ通信が可能な時間帯を算出する通信可能時間帯算出手段と、
前記検出されたアクセスポイントにおける前記データ通信が可能な時間帯のデータ通信を予約するデータ通信予約手段と、
各アクセスポイントの時刻毎の予約状況を登録した予約状況登録手段と、
前記データ通信予約手段からの予約があると前記予約状況登録手段を参照して前記予約が可能か否かを判別し、可能であれば前記予約を前記予約状況登録手段に登録して管理する予約管理手段を有することにより、設定ルート上のアクセスポイントにおいて必要なデータ通信を確実に行うことができる。 The road-to-vehicle communication device of the present invention searches for a travel route based on an input of a destination, sets an optimal travel route as a set route, and detects an access point for road-to-vehicle communication on the set route. Point detection means;
A communicable time zone calculating means for calculating a time zone in which data communication is possible when passing through the detected access point;
A data communication reservation means for reserving data communication in a time zone in which the data communication at the detected access point is possible;
Reservation status registration means for registering the reservation status of each access point at each time,
When there is a reservation from the data communication reservation unit, the reservation status registration unit is referred to determine whether or not the reservation is possible, and if possible, the reservation is registered and managed in the reservation status registration unit By having the management means, necessary data communication can be reliably performed at the access point on the set route.

また、前記路車間通信装置の予約管理手段は、各アクセスポイントの時刻毎の予約回線数を同時接続可能回線数と比較して前記予約が可能か否かを判別する。   The reservation management means of the road-to-vehicle communication device determines whether or not the reservation is possible by comparing the number of reserved lines at each time of each access point with the number of simultaneously connectable lines.

本発明によれば、設定ルート上のアクセスポイントにおいて必要なデータ通信を確実に行うことができる。   According to the present invention, necessary data communication can be reliably performed at an access point on a set route.

以下、図面に基づいて本発明の実施形態について説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

図１は、本発明の路車間通信装置を適用した無線通信システムの第１実施形態のシステム構成図を示す。   FIG. 1 is a system configuration diagram of a first embodiment of a wireless communication system to which a road-vehicle communication device of the present invention is applied.

同図中、車両１０には、無線通信部１１、カーナビゲーションシステム１２、車速計１３、ＡＰ到達時刻算出部１４、ＡＰ予約部１５、ダウンロード部１６が設けられている。   In the figure, a vehicle 10 is provided with a wireless communication unit 11, a car navigation system 12, a vehicle speed meter 13, an AP arrival time calculation unit 14, an AP reservation unit 15, and a download unit 16.

無線通信部１１は、管理センタ２０との間で伝送速度が小さいが通信エリアの広い広域通信を行うと共に、路車間通信用のアクセスポイントＡＰｉ（ｉは１からｎまでの整数）との間で伝送速度が大きい無線ＬＡＮ等の狭域通信を行う。   The wireless communication unit 11 performs wide-area communication with a wide communication area with a low transmission speed with the management center 20, and also with an access point APi (i is an integer from 1 to n) for road-to-vehicle communication. Performs narrow area communication such as wireless LAN with high transmission speed.

カーナビゲーションシステム１２は、目的地が入力されると、目的地までの走行ルートを探索して最適な走行ルートを設定ルートに設定し、設定ルート上にある路車間通信用のアクセスポイントを検出してＡＰ到達時刻算出部１４に供給する。   When the destination is input, the car navigation system 12 searches for a travel route to the destination, sets the optimum travel route as the set route, and detects an access point for road-to-vehicle communication on the set route. To the AP arrival time calculator 14.

ＡＰ到達時刻算出部１４は、カーナビゲーションシステム１２から得られる車両の現在地から設定ルート上の各アクセスポイントまでの距離、車速計１３から得られる現在の車速、目的地までの設定ルートにおける予測車速に基づいて、車両１０が各アクセスポイントの無線エリアに到達する到達時刻及び滞在時間を算出する。なお、設定ルートにおける予測車速としては、各ルートの渋滞状況をカーナビゲーションシステム１２と接続されたＶＩＣＳ（道路交通情報通信システム）等から入手して利用する。   The AP arrival time calculation unit 14 determines the distance from the current location of the vehicle obtained from the car navigation system 12 to each access point on the set route, the current vehicle speed obtained from the speedometer 13, and the predicted vehicle speed on the set route to the destination. Based on this, the arrival time and the stay time for the vehicle 10 to reach the wireless area of each access point are calculated. In addition, as the predicted vehicle speed in the set route, the traffic condition of each route is obtained from a VICS (road traffic information communication system) connected to the car navigation system 12 and used.

ＡＰ予約部１５は、無線通信部１１を介し管理センタ２０に対して各アクセスポイントの到達時刻及び滞在時間を予約時間帯とするデータ通信の予約を行い、この予約に対する予約結果を受信して、ナビゲーション表示画面に表示する。   The AP reservation unit 15 reserves data communication using the arrival time and stay time of each access point as a reservation time zone with respect to the management center 20 via the wireless communication unit 11 and receives a reservation result for this reservation, Display on the navigation display screen.

ダウンロード部１６は、車両１０が各アクセスポイントの無線エリアにいるときに、無線通信部１１を介しアクセスポイントからコンテンツデータ等のダウンロードを行う。   The download unit 16 downloads content data and the like from the access point via the wireless communication unit 11 when the vehicle 10 is in the wireless area of each access point.

管理センタ２０には、通信部２１、接続状況管理部２２、予約データベース２３、予約管理部２４、無線通信部２５が設けられている。   The management center 20 includes a communication unit 21, a connection status management unit 22, a reservation database 23, a reservation management unit 24, and a wireless communication unit 25.

通信部２１は、アクセスポイントＡＰ１〜ＡＰｎとの間で通信を行う。接続状況管理部２２は、通信部２１を介し各アクセスポイントにおける接続状況を収集し、収集した接続状況を予約管理部２４に通知する。ここで、接続状況とは通信速度と、現時点で車両と無線接続している回線数（予約無しも含む）である。   The communication unit 21 communicates with the access points AP1 to APn. The connection status management unit 22 collects the connection status at each access point via the communication unit 21 and notifies the reservation management unit 24 of the collected connection status. Here, the connection status is the communication speed and the number of lines (including no reservation) that are currently wirelessly connected to the vehicle.

予約管理部２４は、各アクセスポイントにおける時刻毎の予約状況（予約車両の車両ＩＤ、予約回線数、通信速度）と同時接続可能回線数を、予約データベース２３を用いて管理している。   The reservation management unit 24 uses the reservation database 23 to manage the reservation status (vehicle ID of reserved vehicle, number of reserved lines, communication speed) and the number of simultaneously connectable lines at each access point.

予約管理部２４は、無線通信部２５を介し各車両からデータ通信の予約を受けると、予約データベース２３を参照して、予約に含まれる各アクセスポイントにおける予約時間帯に空きがあり予約可能であるか、すなわち、各アクセスポイントにおける予約時間帯の予約回線数と現時点で予約無しで接続している回線数の加算値が同時接続可能回線数未満であるか否かを判定する。   When the reservation management unit 24 receives a reservation for data communication from each vehicle via the wireless communication unit 25, the reservation management unit 24 refers to the reservation database 23, and the reservation time zone at each access point included in the reservation is available and can be reserved. That is, it is determined whether or not the added value of the number of reserved lines in the reserved time zone at each access point and the number of lines connected without reservation at present is less than the number of simultaneously connectable lines.

そして、予約可能であれば当該予約を受付け（予約データベース２３に予約を登録）、予約の可否及び予約されたアクセスポイントにおける通信データ量（予約時間帯×通信速度）を、予約を行った車両に対し応答する。更に、受付けた予約に該当するアクセスポイントに対し、通信部２１から受付けた予約（予約車両の車両ＩＤと予約時間帯）を通知する。   If the reservation is possible, the reservation is accepted (reservation is registered in the reservation database 23), and whether or not the reservation is possible and the communication data amount (reservation time zone × communication speed) at the reserved access point are set in the vehicle that has made the reservation. Respond to. Furthermore, the reservation (vehicle ID and reservation time zone of the reserved vehicle) received from the communication unit 21 is notified to the access point corresponding to the received reservation.

各アクセスポイントＡＰ１〜ＡＰｎそれぞれは、車両１０が各アクセスポイントの無線エリア内に存在するとき、車両１０の無線通信部１１と無線ＬＡＮで接続し、車両１０にコンテンツデータを送信する。   Each of the access points AP <b> 1 to APn is connected to the wireless communication unit 11 of the vehicle 10 via a wireless LAN when the vehicle 10 exists in the wireless area of each access point, and transmits content data to the vehicle 10.

また、各アクセスポイントＡＰ１〜ＡＰｎは、予約管理部２４から通知される予約及び予約時間帯を予約リストに登録すると共に、それぞれにおける接続状況を管理センタ２０の通信部２１に送信する。   Each access point AP <b> 1 to APn registers the reservation and the reservation time zone notified from the reservation management unit 24 in the reservation list, and transmits the connection status of each reservation to the communication unit 21 of the management center 20.

図２は、車両が実行する予約処理の一実施形態のフローチャートを示す。この処理は車両１０で目的地を設定する際に実行される。同図中、ステップＳ１０で車両１０の乗員はカーナビゲーションシステム１２に目的地を設定する。これによって、ステップＳ１１でカーナビゲーションシステム１２は目的地までの最適な走行ルートを検索して設定ルートに設定する。   FIG. 2 shows a flowchart of an embodiment of the reservation process executed by the vehicle. This process is executed when the destination is set by the vehicle 10. In the figure, the passenger of the vehicle 10 sets a destination in the car navigation system 12 in step S10. Accordingly, in step S11, the car navigation system 12 searches for the optimum travel route to the destination and sets it as the set route.

ステップＳ１２でカーナビゲーションシステム１２は設定ルート上にある複数のアクセスポイントを検出する。なお、設定ルート上に１つのアクセスポイントしかない場合もあり得る。   In step S12, the car navigation system 12 detects a plurality of access points on the set route. Note that there may be only one access point on the set route.

次に、ステップＳ１３でＡＰ到達時刻算出部１４は車両１０が設定ルート上の各アクセスポイントに到達する到達時刻及び滞在時間を算出する。ここでは、カーナビゲーションシステム１２から得られる車両１０の現在地から各アクセスポイントまでの距離、車速計１３から得られる現在の車速、目的地までの設定ルートにおける予測車速に基づいて、車両が各アクセスポイントに到達する時刻及び滞在時間を算出する。   Next, in step S13, the AP arrival time calculation unit 14 calculates the arrival time and the stay time at which the vehicle 10 reaches each access point on the set route. Here, based on the distance from the current location of the vehicle 10 to each access point obtained from the car navigation system 12, the current vehicle speed obtained from the vehicle speedometer 13, and the predicted vehicle speed on the set route to the destination, The time to reach and the stay time are calculated.

ステップＳ１４でＡＰ到達時刻算出部１４はカーナビゲーションシステム１２から得られる各アクセスポイントの無線エリアと予測車速から各アクセスポイントの無線エリア内に車両１０がいる滞在時間を算出する。   In step S <b> 14, the AP arrival time calculation unit 14 calculates the stay time that the vehicle 10 is in the wireless area of each access point from the wireless area of each access point and the predicted vehicle speed obtained from the car navigation system 12.

次に、ステップＳ１５でＡＰ予約部１５は無線通信部１１を介し管理センタ２０に対して各アクセスポイントの到達時刻及び滞在時間を予約時間帯とするデータ通信の予約を行う。なお、この予約には車両１０の車両ＩＤを含める。   Next, in step S <b> 15, the AP reservation unit 15 reserves data communication using the arrival time and stay time of each access point with the management center 20 via the wireless communication unit 11. The reservation includes the vehicle ID of the vehicle 10.

そして、ステップＳ１６でＡＰ予約部１５はデータ通信の予約に対する管理センタ２０の応答、つまり予約結果を受信して、各アクセスポイントで予約されたデータ通信量及び目的地までの全てのアクセスポイントで予約されたデータ通信量の総和をカーナビゲーションシステム１２に供給してナビゲーション表示画面に表示させる。   In step S16, the AP reservation unit 15 receives the response of the management center 20 with respect to the data communication reservation, that is, the reservation result, and reserves the data communication amount reserved at each access point and all the access points up to the destination. The total sum of the data traffic is supplied to the car navigation system 12 and displayed on the navigation display screen.

なお、車両１０がルート変更を行って、設定ルートから外れた場合には、上記図２の予約処理を最初からやり直す。   When the vehicle 10 changes the route and deviates from the set route, the reservation process shown in FIG. 2 is repeated from the beginning.

図３は、予約されたデータ通信量を表示したナビゲーション表示画面の一例を示す。同図中、三角マークは現在地を表わし、目的地を「Ｇ」で表わしている。また、「ＡＰ１」，「ＡＰ２」，「ＡＰ３」それぞれがアクセスポイントを表わし、アクセスポイントの側に表示された「２０ＫＢ」、「１０ＫＢ」、「５ＫＢ」それぞれが各アクセスポイントで予約されたデータ通信量（単位はｂｐｓ）である。また、画面下部には、予約されたデータ通信量の総和が表示されている。   FIG. 3 shows an example of a navigation display screen displaying the reserved data communication volume. In the figure, the triangle mark represents the current location, and the destination is represented by “G”. “AP1”, “AP2”, “AP3” represent access points, and “20 KB”, “10 KB”, and “5 KB” displayed on the access point side are reserved for each access point. Amount (unit: bps). In addition, the total sum of the reserved data traffic is displayed at the bottom of the screen.

図４は、各アクセスポイントが実行するデータ通信処理の一実施形態のフローチャートを示す。この処理はアクセスポイントに車両１０が接近した際に実行される。同図中、ステップＳ２０で車両１０がアクセスポイントに接近し、無線エリア内に入る。   FIG. 4 shows a flowchart of an embodiment of data communication processing executed by each access point. This process is executed when the vehicle 10 approaches the access point. In the figure, in step S20, the vehicle 10 approaches the access point and enters the wireless area.

ステップＳ２１でアクセスポイントは車両１０が送信する車両ＩＤを含むデータ通信要求を受信し、ステップＳ２２でアクセスポイントは受信した車両ＩＤが予約リストに登録されており、その予約時間帯に現在時刻が含まれているか否かを判別する。   In step S21, the access point receives a data communication request including the vehicle ID transmitted by the vehicle 10, and in step S22, the access point has the received vehicle ID registered in the reservation list, and the reservation time zone includes the current time. It is determined whether or not.

車両ＩＤが予約リストに登録されており、その予約時間帯に現在時刻が含まれている場合には、ステップＳ２３でアクセスポイントは車両１０と無線ＬＡＮで接続し、要求されたデータ通信を行って、要求されたコンテンツ等の通信データを車両１０にダウンロードする。   If the vehicle ID is registered in the reservation list and the current time is included in the reservation time zone, the access point connects to the vehicle 10 via the wireless LAN in step S23 and performs the requested data communication. The communication data such as the requested content is downloaded to the vehicle 10.

図５は、管理センタが実行する予約処理の一実施形態のフローチャートを示す。この処理は管理センタ２０が車両１０からデータ通信の予約を受け取った際に実行される。同図中、ステップＳ３０で無線通信部２１は車両１０から送信された予約を受信する。   FIG. 5 shows a flowchart of an embodiment of the reservation process executed by the management center. This process is executed when the management center 20 receives a data communication reservation from the vehicle 10. In the figure, the wireless communication unit 21 receives the reservation transmitted from the vehicle 10 in step S30.

ステップＳ３１で予約管理部２４は予約データベース２３を参照して、データ通信の予約に含まれる各アクセスポイントにおける予約時間帯に空きがあり予約可能であるか、すなわち、各アクセスポイントにおける予約時間帯の予約回線数と現時点で予約無しで接続している回線数の加算値が同時接続可能回線数未満であるか否かを判定する。   In step S31, the reservation management unit 24 refers to the reservation database 23 to check whether the reservation time zone at each access point included in the data communication reservation is available and can be reserved, that is, the reservation time zone at each access point. It is determined whether the added value of the number of reserved lines and the number of lines connected without reservation at present is less than the number of lines that can be connected simultaneously.

予約可能であれば、予約管理部２４はステップＳ３２で予約を受付け、上記データ通信の予約を予約データベース２３に登録する。そして、予約されたアクセスポイントにおける通信データ量（予約時間帯×通信速度）を、予約を行った車両１０に対し応答する。更に、ステップＳ３３で受付けた予約に該当するアクセスポイントに対し、通信部２１から受付けた予約（予約車両の車両ＩＤと予約時間帯）を通知する。   If the reservation is possible, the reservation management unit 24 accepts the reservation in step S32 and registers the reservation for the data communication in the reservation database 23. Then, the communication data amount (reserved time zone × communication speed) at the reserved access point is responded to the vehicle 10 that made the reservation. Furthermore, the reservation (vehicle ID and reservation time zone of the reserved vehicle) received from the communication unit 21 is notified to the access point corresponding to the reservation received in step S33.

一方、予約不可であれば、ステップＳ３４で予約を行った車両１０に対しその旨の応答を行う。   On the other hand, if the reservation is not possible, a response to that effect is sent to the vehicle 10 that made the reservation in step S34.

このようにして、車両１０は、目的地までの設定ルート上の各アクセスポイントにおいて必要なデータ通信を確実に行うことができる。   In this way, the vehicle 10 can reliably perform necessary data communication at each access point on the set route to the destination.

なお、カーナビゲーションシステム１２が請求項記載のアクセスポイント検出手段に相当し、ＡＰ到達時刻算出部１４が通信可能時間帯算出手段に相当し、ＡＰ予約部１５がデータ通信予約手段に相当し、予約データベース２３が予約状況登録手段に相当し、予約管理部２４が予約管理手段に相当する。   The car navigation system 12 corresponds to the access point detection means described in the claims, the AP arrival time calculation unit 14 corresponds to the communicable time zone calculation means, the AP reservation unit 15 corresponds to the data communication reservation means, and the reservation The database 23 corresponds to reservation status registration means, and the reservation management unit 24 corresponds to reservation management means.

本発明の路車間通信装置を適用した無線通信システムの第１実施形態のシステム構成図である。1 is a system configuration diagram of a first embodiment of a wireless communication system to which a road-vehicle communication device of the present invention is applied. 車両が実行する予約処理の一実施形態のフローチャートである。It is a flowchart of one Embodiment of the reservation process which a vehicle performs. 予約されたデータ通信量を表示したナビゲーション表示画面の一例を示す図である。It is a figure which shows an example of the navigation display screen which displayed the reserved data traffic. 各アクセスポイントが実行するデータ通信処理の一実施形態のフローチャートである。It is a flowchart of one Embodiment of the data communication process which each access point performs. 管理センタが実行する予約処理の一実施形態のフローチャートである。It is a flowchart of one Embodiment of the reservation process which a management center performs.

符号の説明Explanation of symbols

１０ 車両
１１ 無線通信部
１２ カーナビゲーションシステム
１３ 車速計
１４ ＡＰ到達時刻算出部
１５ ＡＰ予約部
１６ ダウンロード部
２０ 管理センタ
２１ 通信部
２２ 接続状況管理部
２３ 予約データベース
２４ 予約管理部
ＡＰ１〜ＡＰｎ アクセスポイント DESCRIPTION OF SYMBOLS 10 Vehicle 11 Wireless communication part 12 Car navigation system 13 Speedometer 14 AP arrival time calculation part 15 AP reservation part 16 Download part 20 Management center 21 Communication part 22 Connection status management part 23 Reservation database 24 Reservation management part AP1-APn Access point

Claims (2)

目的地の入力に基づいて走行ルートを探索して最適な走行ルートを設定ルートに設定し、前記設定ルート上にある路車間通信用のアクセスポイントを検出するアクセスポイント検出手段と、
検出されたアクセスポイントを通過する際にデータ通信が可能な時間帯を算出する通信可能時間帯算出手段と、
前記検出されたアクセスポイントにおける前記データ通信が可能な時間帯のデータ通信を予約するデータ通信予約手段と、
各アクセスポイントの時刻毎の予約状況を登録した予約状況登録手段と、
前記データ通信予約手段からの予約があると前記予約状況登録手段を参照して前記予約が可能か否かを判別し、可能であれば前記予約を前記予約状況登録手段に登録して管理する予約管理手段を
有することを特徴とする路車間通信装置。 An access point detection means for searching for a travel route based on an input of a destination and setting an optimal travel route as a set route, and detecting an access point for road-to-vehicle communication on the set route;
A communicable time zone calculating means for calculating a time zone in which data communication is possible when passing through the detected access point;
A data communication reservation means for reserving data communication in a time zone in which the data communication at the detected access point is possible;
Reservation status registration means for registering the reservation status of each access point at each time,
When there is a reservation from the data communication reservation unit, the reservation status registration unit is referred to determine whether or not the reservation is possible, and if possible, the reservation is registered and managed in the reservation status registration unit A road-to-vehicle communication device comprising a management means. 請求項１記載の路車間通信装置において、
前記予約管理手段は、各アクセスポイントの時刻毎の予約回線数を同時接続可能回線数と比較して前記予約が可能か否かを判別することを特徴とする路車間通信装置。 In the road-vehicle communication apparatus according to claim 1,
The reservation management means determines whether or not the reservation is possible by comparing the number of reserved lines at each time of each access point with the number of simultaneously connectable lines.
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