JP2007267167A - Wireless communication system and base station, and mobile wireless communication device - Google Patents

Wireless communication system and base station, and mobile wireless communication device Download PDF

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JP2007267167A
JP2007267167A JP2006091077A JP2006091077A JP2007267167A JP 2007267167 A JP2007267167 A JP 2007267167A JP 2006091077 A JP2006091077 A JP 2006091077A JP 2006091077 A JP2006091077 A JP 2006091077A JP 2007267167 A JP2007267167 A JP 2007267167A
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base station
transmission timing
wireless communication
mobile
communication
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Atsushi Kosaka
敦志 匂坂
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Toyota Motor Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a wireless communication device which have at least some of wireless communication channels shared between communication with a base station and communication with other communication terminal device and which can effectively suppress interference and collision between communication with the base station and communication with other communication terminal device, and also to provide a wireless communication system. <P>SOLUTION: A wireless communication device of a car 100<SB>A</SB>in a wireless communication area of a wireless communication device of a base station 200<SB>A</SB>sends received data about transmission timing of the wireless communication device of the base station to a wireless communication device of a car 100<SB>C</SB>in a wireless communication area of a wireless communication device of other base station 200<SB>C</SB>via a wireless communication device of a car 100<SB>B</SB>outside the wireless communication area of the wireless communication device of the base station 200<SB>A</SB>. In addition, the wireless communication device of the car 100<SB>C</SB>sends this data to the wireless communication device of the other base station 200<SB>C</SB>. The other base station 200<SB>C</SB>synchronizes the transmission timing with the base station 200<SB>A</SB>based on the received data. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、移動体と基地局間、移動体相互間で少なくとも通信チャンネルの一部を共有して通信を行う無線通信システムおよびこれを構成する基地局や移動体に用いられる無線通信システムに関する。   The present invention relates to a radio communication system that performs communication by sharing at least a part of a communication channel between a mobile unit and a base station, and between mobile units, and a radio communication system used for a base station and a mobile unit constituting the same.

近年、ＩＴＳ（Intelligent Transport Systems＝高度道路交通システム）やＶＩＣＳ（Vehicle Informationand Communication System＝道路交通情報通信システム）等、道路を通行する車両に対して交通情報等の各種情報を提供するシステムの導入が進められている。この種のシステムでは、路側に設置した路側通信装置（基地局）と車両に搭載された通信装置間で通信を行う路車間通信により情報を交信している。   In recent years, systems such as ITS (Intelligent Transport Systems) and VICS (Vehicle Information and Communication System) have been introduced to provide various information such as traffic information to vehicles traveling on the road. It is being advanced. In this type of system, information is communicated by road-to-vehicle communication in which communication is performed between a roadside communication device (base station) installed on the roadside and a communication device mounted on the vehicle.

さらに、他車両と、各車両が有している交通情報や自車両の運転状態、自車両が検知した周囲の状態等の情報を交信しあうことで、自車の進路に関する情報把握を可能とする車々間通信システムが知られている。   In addition, it is possible to grasp the information about the course of the own vehicle by communicating with other vehicles such as traffic information that each vehicle has, the driving state of the own vehicle, and the surrounding state detected by the own vehicle. Inter-vehicle communication systems are known.

路車間通信、車々間通信の通信方式、周波数等が異なると、対応する車載の通信装置を別々に用意する必要が生じ、通信装置のコストが増大してしまう。また、それぞれに別々の帯域を確保することは電波帯域の有効活用という面でも好ましくはない。そこで、少なくとも無線通信チャネルの一部を共有する構成とすることがその普及のためにも好ましい。   If the road-to-vehicle communication, the communication method of the vehicle-to-vehicle communication, the frequency, and the like are different, it is necessary to separately prepare a corresponding in-vehicle communication device, and the cost of the communication device increases. In addition, securing separate bands for each is not preferable in terms of effective use of the radio wave band. Therefore, it is preferable for the spread that at least a part of the wireless communication channel is shared.

このように無線通信チャネルの一部を共有する構成とすると、車々間通信と路車間通信で同じ無線通信チャネルを使用してしまい、両者が干渉・衝突してしまう可能性がある。特許文献１記載の技術はこうした干渉・衝突を抑制することを目的とするものであり、各移動端末は、基地局から割り当てられた通信スロット（チャネル）を用いて、車々間通信を行うことで路車間通信と車々間通信とを別チャネルで行うものである。
特許第３６６８６２５号明細書 If the wireless communication channel is partly shared in this way, the same wireless communication channel is used in the inter-vehicle communication and the road-to-vehicle communication, and there is a possibility that both interfere and collide. The technology described in Patent Document 1 is intended to suppress such interference and collision, and each mobile terminal uses a communication slot (channel) allocated from a base station to perform road-to-vehicle communication. Inter-vehicle communication and inter-vehicle communication are performed on different channels.
Japanese Patent No. 3668625

ところで、通常、路車間通信の通信エリアは、各移動端末の通信可能範囲より狭く設定されている。このため、路車間通信の通信エリア内に位置する車両は、この通信エリア外の車両とも通信が可能であるが、通信エリア外の車両は、通信エリア内の車両と通信が可能であっても、基地局とは通信ができないため、通信チャネルの割り当てを受けることができず、路車間通信と同じ通信チャネルを用いて通信を行う可能性があり、その場合には、通信エリア内における路車間通信と通信エリア外からの車々間通信とが干渉・衝突してしまう事態が発生しうる。   By the way, the communication area of road-to-vehicle communication is normally set narrower than the communicable range of each mobile terminal. For this reason, a vehicle located in the communication area for road-to-vehicle communication can communicate with a vehicle outside this communication area, but a vehicle outside the communication area can communicate with a vehicle within the communication area. Because communication with the base station is not possible, communication channel assignment cannot be received, and communication may be performed using the same communication channel as road-to-vehicle communication. There may occur a situation in which communication and inter-vehicle communication from outside the communication area interfere and collide.

このことは、車載の通信装置に限られるものではなく、基地局との間、または無線通信端末装置相互間で無線通信可能な各種の通信装置、例えば、無線ＬＡＮ装置や電話端末装置等においても生じる課題である。   This is not limited to in-vehicle communication devices, but also in various communication devices capable of wireless communication with base stations or between wireless communication terminal devices, such as wireless LAN devices and telephone terminal devices. It is a problem that arises.

そこで本発明は、基地局との通信と他の通信端末装置との通信とで無線通信チャネルの少なくとも一部を共有する無線通信装置において、基地局との通信と他の通信端末装置の通信との干渉・衝突を効果的に抑制することを可能とする無線通信装置および無線通信システムを提供することを課題とする。   Therefore, the present invention relates to a communication with a base station and a communication with another communication terminal apparatus in a wireless communication apparatus that shares at least a part of a wireless communication channel between the communication with the base station and the communication with another communication terminal apparatus. It is an object of the present invention to provide a wireless communication apparatus and a wireless communication system that can effectively suppress interference and collisions.

上記課題を解決するため、本発明にかかる無線通信システムは、移動体間および基地局−移動体間の無線通信を少なくとも一部同一の周波数チャンネルを使用して行う無線通信システムにおいて、基地局から移動体へデータを送信するタイミングを、同一の周波数チャンネルを用いて移動体と通信を行っている他の基地局のデータ送信タイミングに同期させる基地局同期手段を備えていることを特徴とする。   In order to solve the above-described problems, a wireless communication system according to the present invention includes a wireless communication system that performs wireless communication between mobile units and between a base station and a mobile unit using at least a part of the same frequency channel. Base station synchronization means for synchronizing the timing of transmitting data to the mobile unit with the data transmission timing of another base station communicating with the mobile unit using the same frequency channel is provided.

基地局Ａと他の基地局Ｂとが直接通信可能でなく、基地局Ａの通信エリア内に位置する移動体Ｘと、基地局Ｂの通信エリア内に位置する移動体Ｙも直接に相互通信可能でなくとも、基地局Ａ、Ｂのいずれの通信エリアの外に位置している移動体Ｚが移動体ＸおよびＹと相互に通信可能である場合がありうる。この場合に、基地局Ａ、Ｂの通信と移動体Ｚから移動体Ｘ、Ｙへの通信衝突を避けるため、移動体Ｚに基地局Ａ、Ｂの通信タイミングを知らせる手法があるが、基地局Ａ、Ｂがそれぞれ独立したタイミングで送信を行っていると、移動体Ｚが送信を行えるタイミングやチャンネルが限定される。本発明によれば、基地局Ａ、Ｂの通信タイミングを同期させるので、移動体Ｚが使用できる時間領域幅やチャンネル幅が拡大する。   The base station A and the other base station B are not directly communicable, and the mobile object X located in the communication area of the base station A and the mobile object Y located in the communication area of the base station B also directly communicate with each other. Although not possible, there may be a case where the mobile unit Z located outside the communication area of either of the base stations A and B can communicate with the mobile units X and Y. In this case, in order to avoid communication collision between the base stations A and B and the mobile body Z to the mobile bodies X and Y, there is a method for informing the mobile body Z of the communication timings of the base stations A and B. If A and B are transmitting at independent timings, the timing and channel at which the mobile unit Z can transmit are limited. According to the present invention, since the communication timings of the base stations A and B are synchronized, the time domain width and channel width that can be used by the mobile unit Z are expanded.

基地局から該移動体へのデータ送信タイミングを取得する送信タイミング取得手段と、該移動体から他の移動体へ取得したデータ送信タイミングを伝送する第１送信タイミング伝送手段と、他の移動体から取得した基地局の移動体へのデータ送信タイミングを、移動体から他の基地局へと伝送する第２送信タイミング伝送手段と、をさらに備えていることが好ましい。   Transmission timing acquisition means for acquiring data transmission timing from the base station to the mobile body, first transmission timing transmission means for transmitting data transmission timing acquired from the mobile body to another mobile body, and other mobile bodies It is preferable to further include second transmission timing transmission means for transmitting the acquired data transmission timing of the base station to the mobile unit from the mobile unit to another base station.

この同期は、基地局間での通信や基地局と基地局を制御する装置との通信等に基づいて行ってもよいが、基地局Ａのデータ送信タイミングを移動体Ｘから移動体Ｙ、Ｚを介して基地局Ｂへと伝送することで、基地局Ｂに基地局Ａのデータ送信タイミングを伝えるとよい。   This synchronization may be performed based on communication between base stations, communication between the base station and a device that controls the base station, or the like, but the data transmission timing of the base station A is changed from the mobile unit X to the mobile units Y and Z. It is preferable to transmit the data transmission timing of the base station A to the base station B by transmitting the data to the base station B.

移動体間のデータ通信を基地局の送信タイミングを回避して行うよう制御する移動体通信制御手段をさらに備えているとよい。基地局Ａ、Ｂのデータ送信タイミングが同期されているため、これを避けて移動体Ｘ−Ｚ、Ｙ−Ｚ間の通信を行うことで、エリア内における通信衝突が防止できる。   It is preferable to further include mobile communication control means for performing control so that data communication between mobile bodies is performed while avoiding the transmission timing of the base station. Since the data transmission timings of the base stations A and B are synchronized, communication between the mobile bodies XZ and YZ can be avoided by avoiding this, thereby preventing a communication collision in the area.

一方、上記課題を解決するため、本発明にかかる基地局無線通信装置は、所定の通信エリア内に位置する移動体との通信を行う基地局無線通信装置において、同一の周波数チャンネルを使用する他の基地局の送信タイミングを取得する送信タイミング取得手段と、取得した送信タイミングと同期するように自局の送信タイミングを制御する送信タイミング制御手段と、を備えることを特徴とする。これにより、基地局無線通信装置の送信タイミングを他の基地局の送信タイミングと同期させる。   On the other hand, in order to solve the above problems, a base station radio communication apparatus according to the present invention uses the same frequency channel in a base station radio communication apparatus that communicates with a mobile body located in a predetermined communication area. Transmission timing acquisition means for acquiring the transmission timing of the base station, and transmission timing control means for controlling the transmission timing of the own station so as to be synchronized with the acquired transmission timing. Thereby, the transmission timing of the base station radio communication apparatus is synchronized with the transmission timing of other base stations.

また、上記課題を解決するため、本発明にかかる移動体無線通信装置は、移動体に搭載され、基地局や移動体との通信を行う移動体無線通信装置であって、基地局の送信タイミングを取得する送信タイミング取得手段と、基地局と同一の周波数チャンネルを使用する他の基地局に取得した送信タイミングを伝送する送信タイミング伝送手段と、を備えていることを特徴とする。これにより、基地局に対して、他の基地局のデータ送信タイミングを伝える。   In order to solve the above-described problem, a mobile radio communication apparatus according to the present invention is a mobile radio communication apparatus that is mounted on a mobile object and performs communication with a base station or a mobile object. Transmission timing acquisition means for acquiring the transmission timing, and transmission timing transmission means for transmitting the transmission timing acquired to another base station using the same frequency channel as the base station. Thereby, the data transmission timing of another base station is transmitted to the base station.

他の基地局に対して、その送信タイミングを伝送した他の基地局の送信タイミングと同期させる制御を行うよう指令する同期指令手段をさらに備えていると、同期させることが容易になる。   Synchronization is facilitated by further providing synchronization command means for instructing another base station to perform control for synchronizing the transmission timing with the transmission timing of the other base station that has transmitted the transmission timing.

本発明にかかる無線通信システム、基地局無線通信装置によれば、基地局同士のデータ送信タイミングを同期させるので、これと衝突しない通信用の時間領域を最大限確保することができるので、移動体間の通信に使える時間領域の有効利用を図ることができ、通信トラフィックの増大に対応できる。   According to the radio communication system and the base station radio communication apparatus according to the present invention, since the data transmission timings between the base stations are synchronized, it is possible to secure the maximum time domain for communication that does not collide with the mobile station. It is possible to effectively use the time domain that can be used for communication between the two, and cope with an increase in communication traffic.

移動体無線通信装置から他局のデータ送信タイミングを通知してもらうことで、当該他局と自局のデータ送信タイミングを同期させるようにすると、同期のために特別なインフラが必要なく、簡易かつ確実に同期を行うことができるという利点がある。   By having the mobile radio communication device notify the data transmission timing of the other station so as to synchronize the data transmission timing of the other station and the own station, there is no need for special infrastructure for synchronization, There is an advantage that synchronization can be surely performed.

移動体無線通信装置のデータ送信タイミングをこの基地局のデータ送信タイミングを避けるように設定することで、移動体からの送信と基地局からの送信の通信衝突・干渉を確実に防止することができ、衝突によって生じうる通信トラフィックの増大を抑制することができ、電波の効率よい利用を行うことができる。   By setting the data transmission timing of the mobile radio communication device so as to avoid the data transmission timing of this base station, it is possible to reliably prevent communication collision / interference between transmission from the mobile unit and transmission from the base station. Therefore, an increase in communication traffic that may be caused by a collision can be suppressed, and radio waves can be used efficiently.

以下、添付図面を参照して本発明の好適な実施の形態について詳細に説明する。説明の理解を容易にするため、各図面において同一の構成要素に対しては可能な限り同一の参照番号を附し、重複する説明は省略する。   DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described in detail with reference to the accompanying drawings. In order to facilitate the understanding of the description, the same reference numerals are given to the same components in the drawings as much as possible, and duplicate descriptions are omitted.

図１は、本発明にかかる無線通信システムの一実施形態の構成を示すブロック図である。この無線通信システムは、本発明にかかる基地局無線通信装置２１０と、移動体無線通信装置１１０を含む。図の構成では、各無線通信装置１１０、２１０がそれぞれ１台のみ記載されているが、それぞれ複数台で構成されており、基地局無線通信装置２１０と移動体無線通信装置１１０の間、および、移動体無線通信装置１１０相互間で通信を行う機能を有している。   FIG. 1 is a block diagram showing a configuration of an embodiment of a wireless communication system according to the present invention. This wireless communication system includes a base station wireless communication apparatus 210 and a mobile wireless communication apparatus 110 according to the present invention. In the configuration of the figure, only one wireless communication device 110, 210 is described, but each wireless communication device 110 is composed of a plurality of devices, between the base station wireless communication device 210 and the mobile wireless communication device 110, and The mobile radio communication device 110 has a function of communicating with each other.

本実施形態の移動体無線通信装置１１０は車載式であって、移動体無線通信装置１１０間で通信を行う車々間通信機２と、基地局無線通信装置２１０との間で通信を行う路車間通信機３を備える。車々間通信機２と路車間通信機３とは、例えば、ギガヘルツ帯域に設けられた複数のチャンネルを適宜選択して片方向および双方向通信が可能な無線通信機であり、それぞれ送受信用のアンテナ２０、３０に接続されている。これらのアンテナ２０、３０は、その指向性を変えることが可能であり、送信圏、受信圏を調整することができるものであると好ましい。車々間通信機２に接続されるアンテナ２０は、路車間通信機３に接続されるアンテナ３０より送受信圏が広く設定されている。   The mobile radio communication device 110 of this embodiment is an on-vehicle type, and road-to-vehicle communication that communicates between the inter-vehicle communication device 2 that communicates between the mobile radio communication devices 110 and the base station radio communication device 210. A machine 3 is provided. The vehicle-to-vehicle communication device 2 and the road-to-vehicle communication device 3 are wireless communication devices capable of performing one-way and two-way communication by appropriately selecting a plurality of channels provided in the gigahertz band, for example, and transmitting and receiving antennas 20 respectively. , 30. These antennas 20 and 30 can change their directivities and are preferably capable of adjusting the transmission area and the reception area. The antenna 20 connected to the inter-vehicle communication device 2 has a wider transmission / reception area than the antenna 30 connected to the road-vehicle communication device 3.

移動体無線通信装置１１０は、車々間通信機２と路車間通信機３の送受信データの処理を行う通信制御手段１を備えている。この通信制御手段１は、ＣＰＵ、ＲＯＭ、ＲＡＭ等によって構成される。以下に説明する手段内の各部はハードウェアとして明確に区分されていてもよいが、ハードウェアの一部または全部を共有し、ソフトウェア的に区分されていてもよい。なお、各ソフトウェアはそれぞれ完全に独立している必要はなく、その一部または全部が同一のプログラムにより実現されていてもよく、一つのプログラム内で機能的に複数の部を実現していてもよい。   The mobile wireless communication device 110 includes communication control means 1 that processes transmission / reception data of the inter-vehicle communication device 2 and the road-vehicle communication device 3. This communication control means 1 is comprised by CPU, ROM, RAM, etc. Each unit in the means described below may be clearly divided as hardware, but may share some or all of the hardware and may be divided in software. Note that each software does not have to be completely independent, and part or all of the software may be realized by the same program, or a plurality of parts may be functionally realized in one program. Good.

通信制御手段１は、受信したデータを処理する受信データ処理部１１と、送信データを作成し、データ送信を制御する送信データ処理部１２と、受信データから基地局の送信タイミングを取得する送信タイミング取得部１３と、取得した基地局の送信タイミングに関するデータを伝送する送信タイミング伝送部１４と、基地局に対して送信タイミングの同期指令を発する同期指令部１５とを備えている。通信制御手段１は、図示していない車内ＬＡＮ等を介して車内の情報提供装置４に接続されている。この情報提供装置４とは、車両の位置情報や速度情報を検出する装置（例えば、ナビゲーション装置）のほか、受信したデータに基づいて車両の挙動を制御する車両挙動制御装置などが含まれる。   The communication control means 1 includes a reception data processing unit 11 that processes received data, a transmission data processing unit 12 that creates transmission data and controls data transmission, and a transmission timing that acquires the transmission timing of the base station from the reception data. An acquisition unit 13, a transmission timing transmission unit 14 that transmits data related to the acquired transmission timing of the base station, and a synchronization command unit 15 that issues a transmission timing synchronization command to the base station. The communication control means 1 is connected to an in-vehicle information providing apparatus 4 via an in-vehicle LAN (not shown). The information providing device 4 includes a device for detecting vehicle position information and speed information (for example, a navigation device), a vehicle behavior control device for controlling the behavior of the vehicle based on received data, and the like.

一方、基地局無線通信装置２１０は、移動体無線通信装置１１０と（より具体的には、移動体無線通信装置１１０の路車間通信機３）とデータ通信を行う路車間通信機６を備えており、路車間通信機６は、アンテナ６０に接続されている。アンテナ６０による基地局無線通信装置２１０の通信エリアは、移動体無線通信装置１１０の車々間通信機２の通信エリアより狭い範囲に設定されている。   On the other hand, the base station wireless communication device 210 includes a road-vehicle communication device 6 that performs data communication with the mobile wireless communication device 110 (more specifically, the road-vehicle communication device 3 of the mobile wireless communication device 110). The road-to-vehicle communication device 6 is connected to the antenna 60. The communication area of the base station wireless communication device 210 by the antenna 60 is set to be narrower than the communication area of the inter-vehicle communication device 2 of the mobile wireless communication device 110.

基地局無線通信装置２１０は、さらに、路車間通信機６の送受信データの処理を行う通信制御手段５を備えている。この通信制御手段５は、上述した通信制御手段１と同様に、ＣＰＵ、ＲＯＭ、ＲＡＭ等によって構成される。以下に説明する手段内の各部はハードウェアとして明確に区分されていてもよいが、ハードウェアの一部または全部を共有し、ソフトウェア的に区分されていてもよい。なお、各ソフトウェアはそれぞれ完全に独立している必要はなく、その一部または全部が同一のプログラムにより実現されていてもよく、一つのプログラム内で機能的に複数の部を実現していてもよい。   The base station wireless communication apparatus 210 further includes communication control means 5 that processes transmission / reception data of the road-to-vehicle communication device 6. This communication control means 5 is constituted by a CPU, a ROM, a RAM and the like, similar to the communication control means 1 described above. Each unit in the means described below may be clearly divided as hardware, but may share some or all of the hardware and may be divided in software. Note that each software does not have to be completely independent, and part or all of the software may be realized by the same program, or a plurality of parts may be functionally realized in one program. Good.

通信制御手段５は、受信したデータを処理する受信データ処理部５１と、送信データを作成する送信データ処理部５２と、受信データから他の基地局の送信タイミングを取得する送信タイミング取得部５３と、データ送信のタイミングを制御する送信タイミング制御部５４とを備えている。通信制御手段５は、図示していない有線もしくは無線通信手段により送信する情報を管理するサーバーに接続されたサーバ−クライアント構成としてもよいし、送信情報を管理する情報管理装置に接続されたスタンドアローンタイプの構成をとってもよい。   The communication control means 5 includes a reception data processing unit 51 that processes received data, a transmission data processing unit 52 that creates transmission data, a transmission timing acquisition unit 53 that acquires transmission timings of other base stations from the reception data, And a transmission timing control unit 54 for controlling the timing of data transmission. The communication control means 5 may have a server-client configuration connected to a server that manages information transmitted by wired or wireless communication means (not shown), or a stand-alone connected to an information management apparatus that manages transmission information. It may take a type configuration.

次に、本無線通信システムにおける基地局の同期処理を説明する。図２は、この処理が行われる場合における基地局、移動体の位置関係を説明する図であり、図３は、移動体無線通信装置１１０における処理を、図４は、基地局無線通信装置２１０における処理をそれぞれ説明するフローチャートであり、図５は、各移動体無線通信装置１１０からの送信データのデータ送信タイミングを説明するタイミングチャートである。   Next, base station synchronization processing in the wireless communication system will be described. FIG. 2 is a diagram for explaining the positional relationship between the base station and the mobile unit when this process is performed. FIG. 3 shows the process in the mobile radio communication device 110. FIG. 4 shows the base station radio communication device 210. FIG. 5 is a timing chart for explaining the data transmission timing of transmission data from each mobile radio communication apparatus 110.

ここでは、図２に示されるように、道路３００上に基地局２００Ａ、２００Ｃが離隔して配置されている状況を考える。基地局２００Ａの基地局無線通信装置２１０Ａと基地局２００Ｃの基地局無線通信装置２１０Ｃとは通信圏が離れており、直接相互通信を行うことはできない。基地局２００Ａの基地局無線通信装置２１０Ａの通信圏内に車両１００Ａが位置し、基地局２００Ｃの基地局無線通信装置２１０Ｃの通信圏内には車両１００Ｃが位置しており、基地局無線通信装置２１０Ａと移動体無線通信装置１１０Ａ間、基地局無線通信装置２１０Ｃと移動体無線通信装置１１０Ｃ間は相互に直接通信が可能である。一方、移動体無線通信装置１１０Ａ−１１０Ｃ間は直接には相互通信を行うことはできない。ここで、車両１００Ａと車両１００Ｃの間には、車両１００Ｂが位置しており、車両１００Ａと１００Ｂの移動体無線通信装置１１０Ａ−１１０Ｂ間、および、車両１００Ｃと１００Ｂの移動体無線通信装置１１０Ｃ−１１０Ｂ間では、それぞれ相互に直接通信が可能である。したがって、車両１００Ｂの移動体無線通信装置１１０Ｂを介することで、移動体無線通信装置１１０Ａと１１０Ｃも相互通信が可能となっている。 Here, as shown in FIG. 2, a situation is considered in which base stations 200 A and 200 C are spaced apart on road 300. The base station 200 A base station communication device communication range and 210 A and the base station 200 C base station communication device 210 C of are separated, it is impossible to perform a direct intercommunication. The communication area of the base station 200 A base station communication device 210 A of the positioned vehicle 100 A is located the vehicle 100 C is in the communication range of the base station 200 C of the base station communication device 210 C, the base station radio communication device 210 a and the mobile radio communications device between 110 a, base station communication apparatus 210 C and the mobile wireless communication device 110 C between can be mutually communicate directly. On the other hand, the mobile wireless communication device between 110 A -110 C are not directly able to communicate with each other. Here, between the vehicle 100 A and the vehicle 100 C, are located the vehicle 100 B, the vehicle 100 A and 100 between the mobile wireless communication device 110 A -110 B of B, and the vehicle 100 C and 100 between mobile wireless communications device 110 C -110 B of B, and can mutually communicate directly, respectively. Therefore, by passing through the mobile radio communication device 110 B of the vehicle 100 B, mobile wireless communication device 110 A and 110 C are also enables mutual communication.

最初に移動体無線通信装置１１０側の処理を説明する。図３に示されるように、まず、通信データを受信する（ステップＳ１）。具体的には、アンテナ２０、３０により受信した無線データを車々間通信機２、路車間通信機３によって処理して受信データ処理部１１に取り込む。次に、送信タイミング取得部１３において、車々間通信のデータ中の基地局の送信タイミングデータの存否を判定する（ステップＳ２）。送信データが存在している場合には、ステップＳ３へと移行して、路車間通信ゾーン（通信エリア）内であるか否かを判定する。この判定は、路車間通信機３により路車間通信データを取得しているか否かにより行えばよい。   First, processing on the mobile radio communication apparatus 110 side will be described. As shown in FIG. 3, first, communication data is received (step S1). Specifically, the wireless data received by the antennas 20 and 30 is processed by the inter-vehicle communication device 2 and the road-to-vehicle communication device 3 and taken into the reception data processing unit 11. Next, the transmission timing acquisition unit 13 determines whether or not the transmission timing data of the base station in the inter-vehicle communication data exists (step S2). When transmission data exists, it transfers to step S3 and it is determined whether it is in a road-vehicle communication zone (communication area). This determination may be made based on whether road-vehicle communication data is acquired by the road-vehicle communication device 3 or not.

路車間通信ゾーン内と判定した場合には、ステップＳ４へと移行し、基地局へ別の基地局の送信タイミングデータを送信して処理を終了する。図２に示される例では、車両１００Ａ（１００Ｃ）に搭載された移動体無線通信装置１１０Ａ（１１０Ｃ）が車両１００Ｂの移動体無線通信装置１１０Ｂから自装置が通信エリア内に属していない他の基地局２００Ｃ（２００Ａ）の基地局無線通信装置２１０Ｃ（２１０Ａ）の送信タイミングデータを受信し、基地局２００Ａ（２００Ｃ）の基地局無線通信装置２１０Ａ（２１０Ｃ）へと当該タイミングデータを伝送する場合に対応する。 When it determines with it being in a road-vehicle communication zone, it transfers to step S4, transmits the transmission timing data of another base station to a base station, and complete | finishes a process. In the example shown in FIG. 2, mobile radio communication device 110 A (110 C ) mounted on vehicle 100 A (100 C ) is within the communication area from mobile radio communication device 110 B of vehicle 100 B. The transmission timing data of the base station radio communication device 210 C (210 A ) of the other base station 200 C (200 A ) not belonging to the base station 200 A (200 C ) is received, and the base station radio communication device 210 A ( 210 C ) corresponding to the case of transmitting the timing data.

一方、ステップＳ３で、路車間通信ゾーン内でないと判定した場合には、ステップＳ５へと移行し、当該送信タイミングデータが中継データであるか否かを判定する。中継データであると判定した場合には、そのまま処理を終了する。この場合は、中継を行わないことになる。一方、中継データでない場合、これは、後述するように基地局の通信エリア内に位置している車両１００の移動体無線通信装置１１０（例えば、１１０Ａや１１０Ｃ）から直接基地局の送信タイミングデータを受信した場合であり、この場合には、送信データ処理部１２は、当該データを中継する。図２で示される場合であれば、車両１００Ｃ（１００Ａ）の移動体無線通信装置１１０Ｃ（１１０Ａ）から送信タイミングデータを受信した車両１００Ｂの移動体無線通信装置１１０Ｂは、車両１００Ａ（１００Ｃ）の移動体無線通信装置１１０Ａ（１１０Ｃ）に向けて受信した送信タイミングデータを転送する。 On the other hand, if it is determined in step S3 that it is not within the road-to-vehicle communication zone, the process proceeds to step S5 to determine whether or not the transmission timing data is relay data. If it is determined that the data is relay data, the process ends. In this case, no relay is performed. On the other hand, when it is not relay data, this is the transmission timing of the base station directly from the mobile radio communication device 110 (for example, 110 A or 110 C ) of the vehicle 100 located in the communication area of the base station as will be described later. In this case, the transmission data processing unit 12 relays the data. In the case shown in Figure 2, the vehicle 100 C (100 A) mobile wireless communication device 110 B of the vehicle 100 B that has received the transmission timing data from the mobile wireless communications device 110 C (110 A) of the vehicle The received transmission timing data is transferred to the mobile radio communication apparatus 110 A (110 C ) of 100 A (100 C ).

通常は、１回の中継で到達する範囲の基地局間で後述するような送信タイミングの同期を行えば、当該基地局間に存在する車両との車々間通信と路車間通信の衝突を抑制し、かつ、通信時間域の効率的な使用を図るには十分といえる。しかし、通信伝達確率を向上させたり、さらに広範囲での電波の効率よい活用を図るため、２回以上の所定回数の中継を許可してもよい。   Usually, if the transmission timing synchronization as described later is performed between the base stations in the range reached by one relay, the collision between the vehicle and the road-vehicle communication with the vehicle existing between the base stations is suppressed, And it can be said that it is sufficient for the efficient use of the communication time range. However, two or more times of relaying may be permitted in order to improve the communication transmission probability or to efficiently use radio waves in a wider range.

ステップＳ２で、通信タイミングデータが存在しないと判定した場合には、ステップＳ７へと移行し、路車間通信ゾーン内か否かの判定を行う。この判定はステップＳ３における判定と同一の手法に基づいて行えばよい。ステップＳ７で、通信ゾーン外と判定した場合には、そのまま処理を終了する。この場合には、通常のデータ送受信のみを実行することになる。一方、ステップＳ７で通信ゾーン内と判定した場合には、送信タイミング伝送部１４が送信データ処理部１２に指示して車々間通信に路車間通信の送信タイミングデータを追加した車々間通信機２によりデータ送信を行わせる。図２に示される例では、車両１００Ａ（１００Ｃ）に搭載された移動体無線通信装置１１０Ａ（１１０Ｃ）が基地局２００Ａ（２００Ｃ）の基地局無線通信装置２１０Ａ（２１０Ｃ）の送信タイミングデータを受信し、車々間通信により他の車両１００Ｂに搭載される移動体無線通信装置１１０Ｂへと当該タイミングデータを伝送する場合に対応する。 If it is determined in step S2 that there is no communication timing data, the process proceeds to step S7, where it is determined whether or not the vehicle is in the road-vehicle communication zone. This determination may be performed based on the same method as the determination in step S3. If it is determined in step S7 that it is outside the communication zone, the process is terminated as it is. In this case, only normal data transmission / reception is executed. On the other hand, if it is determined in step S7 that it is in the communication zone, the transmission timing transmission unit 14 instructs the transmission data processing unit 12 to transmit data by the inter-vehicle communication device 2 in which the transmission timing data of road-to-vehicle communication is added to inter-vehicle communication. To do. In the example shown in FIG. 2, the mobile radio communication device 110 A (110 C ) mounted on the vehicle 100 A (100 C ) is the base station radio communication device 210 A (210 C ) of the base station 200 A (200 C ). It receives the transmission timing data), corresponding to the case where the inter-vehicle communication to the mobile radio communication device 110 B which is mounted on another vehicle 100 B transmits the timing data.

なお、同期指令部１５は、複数の基地局２００Ａ、２００Ｃ間でどの基地局の送信タイミングを優先して同期を行うかという基準を保持しておき、優先度の高い基地局からデータを受信した場合に、ステップＳ８やステップＳ６のデータ送信、データ中継を行い、より優先度の低い基地局と通信する場合に、より優先度の高い基地局の送信タイミングデータを送信する処理（ステップＳ４）を行うようにするとよい。この優先度は例えば、車両の進行方向や道路の延長方向を基準に設定されているとよい。 Note that the synchronization command unit 15 holds a reference of which base station transmission timing is to be preferentially synchronized between the plurality of base stations 200 A and 200 C , and receives data from a base station with a high priority. When received, the data transmission and data relay of step S8 and step S6 are performed, and when communicating with a base station having a lower priority, processing for transmitting transmission timing data of the base station having a higher priority (step S4) ). For example, the priority may be set based on the traveling direction of the vehicle or the extending direction of the road.

次に、基地局無線通信装置２１０側の処理を説明する。図４に示されるように、まず、通信データを受信する（ステップＳ１１）。具体的には、アンテナ６０により受信した無線データを路車間通信機６によって処理して受信データ処理部５１に取り込む。次に、送信タイミング取得部５３において、移動体無線通信装置１１０から送られたデータ中の他の基地局の送信タイミングデータの存否を判定する（ステップＳ１２）。当該データが存在していない場合には、同期処理は不要のため処理を終了し、データが存在している場合には、ステップＳ１３へと移行し、送信タイミングの変更の要否を判定する（ステップＳ１３）。ここでは、基地局自体もタイミング同期の優先度を保持しているものとし、受信した送信タイミングが自局より優先度の高い基地局の送信タイミングデータである場合には、ステップＳ１４へ移行して送信タイミングを変更して同期させるようにし、優先度の劣る基地局の送信タイミングデータである場合には同期を行わずに処理を終了するようにするものとする。なお、上述したように移動体無線通信装置１１０側の同期指令部１５により、優先度の高い基地局のデータのみが基地局へと送信される場合には、受信した基地局では無条件に同期を実行する。   Next, processing on the base station radio communication apparatus 210 side will be described. As shown in FIG. 4, first, communication data is received (step S11). Specifically, the radio data received by the antenna 60 is processed by the road-to-vehicle communication device 6 and taken into the received data processing unit 51. Next, the transmission timing acquisition unit 53 determines whether or not there is transmission timing data of another base station in the data transmitted from the mobile radio communication apparatus 110 (step S12). If the data does not exist, the synchronization process is not required and the process is terminated. If the data exists, the process proceeds to step S13 to determine whether or not the transmission timing needs to be changed ( Step S13). Here, it is assumed that the base station itself also holds the timing synchronization priority. If the received transmission timing is the transmission timing data of the base station having a higher priority than the own station, the process proceeds to step S14. The transmission timing is changed to synchronize, and when the transmission timing data is a base station with a lower priority, the processing is terminated without performing synchronization. As described above, when only the data of the base station with high priority is transmitted to the base station by the synchronization command unit 15 on the mobile radio communication apparatus 110 side, the received base station synchronizes unconditionally. Execute.

図５（ａ）は、車両１００Ａの移動体無線通信装置１１０Ａの通信タイミングを示している。基地局２００Ａの基地局無線通信装置２１０Ａは、周期Δｔ１でそれぞれ時間長Δｔ２の領域ｔＣＡを利用してデータ送信を行っており、移動体無線通信装置１１０Ａは、領域ｔＣＡを避けて、その開始時間よりΔｔ３遅れてデータ送信を行う（領域ｔＣａ）。このとき、例えば、基地局無線通信装置２１０Ａの送信タイミングデータとしては周期Δｔ１、継続時間Δｔ２と、開始時刻を規定するためのΔｔ３が挙げられる。さらに、基地局無線通信装置２１０Ａの固有ＩＤ、同期の優先度を含めてもよい。 FIGS. 5 (a) shows the communication timing of the mobile radio communication device 110 A of the vehicle 100 A. Base station radio communication apparatus 210 A of base station 200 A performs data transmission using period t CA of time length Δt 2 with period Δt 1 , and mobile radio communication apparatus 110 A uses area t CA. , And data transmission is performed with a delay of Δt 3 from the start time (region t Ca ). In this case, for example, periodic Delta] t 1 as the transmission timing data of the base station communication device 210 A, and duration Delta] t 2, include Delta] t 3 for defining the start time. Further, unique ID of the base station communication device 210 A, may include synchronization priority.

このデータを受信した車両１００Ｂの移動体無線通信装置１１０Ｂの通信タイミングを図５（ｂ）に示す。移動体無線通信装置１１０Ｂは、領域ｔＣＡ、領域ｔＣａを避けて、領域ｔＣＡの開始時間より例えば、Δｔ４遅れてデータ送信を行う（領域ｔＣｂ）。このとき、中継する基地局無線通信装置２１０Ａの送信タイミングデータとしては周期Δｔ１、継続時間Δｔ２と、開始時刻を規定するためのΔｔ４が挙げられる。さらに、上述したように基地局無線通信装置２１０Ａの固有ＩＤ、同期の優先度を含めてもよく、追加データとして中継回数を含めるとよい。 The communication timing of the mobile radio communication device 110 B of the vehicle 100 B that has received this data is shown in FIG. The mobile radio communication apparatus 110 B avoids the area t CA and the area t Ca and performs data transmission, for example, Δt 4 later than the start time of the area t CA (area t Cb ). At this time, the period Delta] t 1 as the transmission timing data of the base station communication device 210 A for relaying, and duration Delta] t 2, Delta] t 4 can be mentioned to define the start time. Further, unique ID of the base station communication device 210 A, as described above, may be included synchronization priority, may include the number of relays as additional data.

このように自送信データの送信タイミングに対する相対的なタイミングとして基地局の送信タイミングを規定するほか、別に時刻を同期する手段（例えば、標準時刻等による時刻同期手段）を備えている場合、絶対時刻を用いて表示した送信タイミングにより表示を行ってもよい。   In this way, in addition to specifying the transmission timing of the base station as a relative timing with respect to the transmission timing of the self-transmission data, the absolute time is provided when a means for synchronizing the time (for example, a time synchronization means based on a standard time) is provided. You may display by the transmission timing displayed using.

また、有線または無線により基地局間を相互または同一のサーバと接続し、その同期指令によって送信タイミングを同期させてもよい。上述したように移動体通信により基地局同期を行う場合に比べると、インフラ整備等が必要となるが、隣接基地局の通信エリア内とその中間に車々間通信が可能な車両が存在しない場合でも同期が可能となる利点がある。   Further, the base stations may be connected to each other or the same server by wired or wireless, and the transmission timing may be synchronized by the synchronization command. Compared to the case where base station synchronization is performed by mobile communication as described above, infrastructure maintenance is required, but synchronization is possible even when there is no vehicle capable of inter-vehicle communication in the communication area of the adjacent base station and in the middle. There is an advantage that becomes possible.

以上述べた実施形態においては、車載の無線通信端末間で通信を行う車々間通信と車載の無線通信端末と路側通信機の間で通信を行う路車間通信とで無線通信チャネルを共用する場合を例に説明したが、本発明はこれに限られるものではない。路側通信機に代えて所定のエリア内での通信を行う基地局が設けられ、この基地局に対して相互通信可能な移動端末装置が通信を行う場合にも適用できる。この相互通信は、移動端末装置が相互に直接通信を行う場合に限られるものではなく、別種の基地局を介して相互に通信を行う形態であってもよい。この種の通信端末装置としては、無線ＬＡＮ端末や携帯電話等がある。本発明は、このように通信圏が異なる３つ以上の無線通信装置間で通信を行う場合のいわゆる隠れ端末問題を効果的に解決することが可能である。   In the embodiment described above, an example of a case in which a wireless communication channel is shared between vehicle-to-vehicle communication that performs communication between in-vehicle wireless communication terminals and road-to-vehicle communication that performs communication between the in-vehicle wireless communication terminal and the roadside communication device. However, the present invention is not limited to this. The present invention can also be applied to a case where a base station that performs communication within a predetermined area is provided in place of the roadside communication device, and a mobile terminal device that can communicate with the base station performs communication. This mutual communication is not limited to the case where the mobile terminal apparatuses directly communicate with each other, and may be a form in which mutual communication is performed via another type of base station. Examples of this type of communication terminal device include a wireless LAN terminal and a mobile phone. The present invention can effectively solve the so-called hidden terminal problem when communication is performed between three or more wireless communication apparatuses having different communication areas.

本発明にかかる無線通信システムの一実施形態の構成を示すブロック図である。It is a block diagram which shows the structure of one Embodiment of the radio | wireless communications system concerning this invention. 基地局、移動体の位置関係を説明する図である。It is a figure explaining the positional relationship of a base station and a mobile body. 移動体無線通信装置１１０における処理を説明するフローチャートである。4 is a flowchart illustrating processing in mobile radio communication apparatus 110. 基地局無線通信装置２１０における処理を説明するフローチャートである。5 is a flowchart illustrating processing in base station wireless communication apparatus 210. 各移動体無線通信装置１１０からの送信データのデータ送信タイミングを説明するタイミングチャートである。3 is a timing chart for explaining data transmission timing of transmission data from each mobile radio communication apparatus 110.

符号の説明Explanation of symbols

１…通信制御手段、２…車々間通信機、３…路車間通信機、４…情報提供装置、５…通信制御手段、６…路車間通信機、１１…受信データ処理部、１２…送信データ処理部、１３…送信タイミング取得部、１４…送信タイミング伝送部、１５…同期指令部、２０、３０、６０…アンテナ、５１…受信データ処理部、５２…送信データ処理部、５３…送信タイミング取得部、５４…送信タイミング制御部、１００…車両、１１０…移動体無線通信装置、２００…基地局、２１０…基地局無線通信装置、３００…道路。
DESCRIPTION OF SYMBOLS 1 ... Communication control means, 2 ... Inter-vehicle communication device, 3 ... Road-to-vehicle communication device, 4 ... Information provision apparatus, 5 ... Communication control means, 6 ... Road-to-vehicle communication device, 11 ... Reception data processing part, 12 ... Transmission data processing , 13 ... Transmission timing acquisition unit, 14 ... Transmission timing transmission unit, 15 ... Synchronization command unit, 20, 30, 60 ... Antenna, 51 ... Reception data processing unit, 52 ... Transmission data processing unit, 53 ... Transmission timing acquisition unit 54, transmission timing control unit, 100, vehicle, 110, mobile radio communication device, 200, base station, 210, base station radio communication device, 300, road.

Claims (6)

移動体間および基地局−移動体間の無線通信を少なくとも一部同一の周波数チャンネルを使用して行う無線通信システムにおいて、
基地局から移動体へデータを送信するタイミングを、同一の周波数チャンネルを用いて移動体と通信を行っている他の基地局のデータ送信タイミングに同期させる基地局同期手段を備えていることを特徴とする無線通信システム。 In a wireless communication system that performs wireless communication between mobile units and between a base station and a mobile unit using at least part of the same frequency channel,
Base station synchronization means for synchronizing the timing of transmitting data from the base station to the mobile unit with the data transmission timing of another base station communicating with the mobile unit using the same frequency channel A wireless communication system. 基地局から該移動体へのデータ送信タイミングを取得する送信タイミング取得手段と、
該移動体から他の移動体へ取得したデータ送信タイミングを伝送する第１送信タイミング伝送手段と、
他の移動体から取得した基地局の移動体へのデータ送信タイミングを、移動体から他の基地局へと伝送する第２送信タイミング伝送手段と、
をさらに備えていることを特徴とする請求項１記載の無線通信システム。 Transmission timing acquisition means for acquiring data transmission timing from the base station to the mobile unit;
First transmission timing transmission means for transmitting data transmission timing acquired from the mobile body to another mobile body;
Second transmission timing transmission means for transmitting the data transmission timing from the mobile unit to the mobile unit of the base station acquired from the other mobile unit;
The wireless communication system according to claim 1, further comprising: 移動体間のデータ通信を基地局の送信タイミングを回避して行うよう制御する移動体通信制御手段をさらに備えていることを特徴とする請求項１または２に記載の無線通信システム。   The wireless communication system according to claim 1 or 2, further comprising mobile communication control means for controlling data communication between mobile bodies so as to avoid transmission timing of a base station. 所定の通信エリア内に位置する移動体との通信を行う基地局無線通信装置において、
同一の周波数チャンネルを使用する他の基地局の送信タイミングを取得する送信タイミング取得手段と、
取得した送信タイミングと同期するように自局の送信タイミングを制御する送信タイミング制御手段と、
を備えることを特徴とする基地局無線通信装置。 In a base station wireless communication device that performs communication with a mobile body located in a predetermined communication area,
Transmission timing acquisition means for acquiring the transmission timing of other base stations using the same frequency channel;
Transmission timing control means for controlling the transmission timing of the local station so as to be synchronized with the acquired transmission timing;
A base station wireless communication apparatus comprising: 移動体に搭載され、基地局や移動体との通信を行う移動体無線通信装置であって、
基地局の送信タイミングを取得する送信タイミング取得手段と、
前記基地局と同一の周波数チャンネルを使用する他の基地局に取得した送信タイミングを伝送する送信タイミング伝送手段と、
を備えていることを特徴とする移動体無線通信装置。 A mobile wireless communication device mounted on a mobile body and communicating with a base station or mobile body,
Transmission timing acquisition means for acquiring the transmission timing of the base station;
Transmission timing transmission means for transmitting the transmission timing acquired to another base station using the same frequency channel as the base station;
A mobile radio communication apparatus comprising: 前記他の基地局に対して、その送信タイミングを伝送した他の基地局の送信タイミングと同期させる制御を行うよう指令する同期指令手段をさらに備えていることを特徴とする請求項５記載の移動体無線通信装置。   6. The movement according to claim 5, further comprising synchronization command means for commanding the other base station to perform control for synchronizing the transmission timing with the transmission timing of the other base station that has transmitted the transmission timing. Body wireless communication device.
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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011055113A (en) * 2009-08-31 2011-03-17 Denso Corp Radio communication device
WO2011052681A1 (en) * 2009-10-30 2011-05-05 三洋電機株式会社 Base station device
JP2011223195A (en) * 2010-04-07 2011-11-04 Sumitomo Electric Ind Ltd Radio communications system, and mobile communication device and transmission control method used in the same
JP2012186707A (en) * 2011-03-07 2012-09-27 Denso Corp Radio communication device and radio communication system
JP2013229917A (en) * 2013-06-26 2013-11-07 Sumitomo Electric Ind Ltd Radio communications system, and mobile communication device and transmission control method used in the same
JP2014220857A (en) * 2009-10-30 2014-11-20 三洋電機株式会社 Terminal device
JP2015015774A (en) * 2014-10-22 2015-01-22 住友電気工業株式会社 Radio communications system, and mobile communication device and transmission control method used in the same
JP2016178693A (en) * 2016-06-09 2016-10-06 住友電気工業株式会社 Radio communication system, and mobile communication device and transmission control method used in the same
JP2018157582A (en) * 2018-05-23 2018-10-04 住友電気工業株式会社 Radio communication system, and mobile communication device and transmission control method used in the same
WO2020022400A1 (en) * 2018-07-26 2020-01-30 京セラ株式会社 Base station and method for controlling same

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000031895A (en) * 1998-05-08 2000-01-28 Matsushita Electric Ind Co Ltd Communication terminal device and communication method therefor
JP2000165314A (en) * 1998-11-24 2000-06-16 Hitachi Ltd Vehicle-to-vehicle communication system, on-vehicle communication equipment and road side communication equipment
JP2004072482A (en) * 2002-08-07 2004-03-04 Nippon Telegr & Teleph Corp <Ntt> Radio communication method
JP2005197871A (en) * 2004-01-05 2005-07-21 Clarion Co Ltd Inter-vehicle communication system and inter-vehicle communication apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000031895A (en) * 1998-05-08 2000-01-28 Matsushita Electric Ind Co Ltd Communication terminal device and communication method therefor
JP2000165314A (en) * 1998-11-24 2000-06-16 Hitachi Ltd Vehicle-to-vehicle communication system, on-vehicle communication equipment and road side communication equipment
JP2004072482A (en) * 2002-08-07 2004-03-04 Nippon Telegr & Teleph Corp <Ntt> Radio communication method
JP2005197871A (en) * 2004-01-05 2005-07-21 Clarion Co Ltd Inter-vehicle communication system and inter-vehicle communication apparatus

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011055113A (en) * 2009-08-31 2011-03-17 Denso Corp Radio communication device
WO2011052681A1 (en) * 2009-10-30 2011-05-05 三洋電機株式会社 Base station device
JP2011120230A (en) * 2009-10-30 2011-06-16 Sanyo Electric Co Ltd Base station device
JP2014220857A (en) * 2009-10-30 2014-11-20 三洋電機株式会社 Terminal device
JP2011223195A (en) * 2010-04-07 2011-11-04 Sumitomo Electric Ind Ltd Radio communications system, and mobile communication device and transmission control method used in the same
JP2012186707A (en) * 2011-03-07 2012-09-27 Denso Corp Radio communication device and radio communication system
JP2013229917A (en) * 2013-06-26 2013-11-07 Sumitomo Electric Ind Ltd Radio communications system, and mobile communication device and transmission control method used in the same
JP2015015774A (en) * 2014-10-22 2015-01-22 住友電気工業株式会社 Radio communications system, and mobile communication device and transmission control method used in the same
JP2016178693A (en) * 2016-06-09 2016-10-06 住友電気工業株式会社 Radio communication system, and mobile communication device and transmission control method used in the same
JP2018157582A (en) * 2018-05-23 2018-10-04 住友電気工業株式会社 Radio communication system, and mobile communication device and transmission control method used in the same
WO2020022400A1 (en) * 2018-07-26 2020-01-30 京セラ株式会社 Base station and method for controlling same

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