JPS63226127A - Simplex radio communication system for preventing interference - Google Patents

Abstract

PURPOSE:To prevent interference by providing a radio wave presence detecting function so as to proceed mutual communication without interruption of a radio wave in case of data transmission/reception while occupying a radio channel thereby eliminating a period without radio wave. CONSTITUTION:In case of giving a connection start signal 1a to one radio communication equipment A, the radio communication equipment A applies the operation 2a of radio wave presence detection and when the equipment A discriminates that no radio wave is radiated in its radio channel, the operation 3a of transmission is started and a data signal 4a is sent. In case of completing the reception of the data signal 4a from the radio communication equipment A, an opposite radio communication equipment B starts its transmission operation 1b in a shorter time than the end of the period of the no modulation transmission 5a of the radio communication equipment A and sends a data signal 2b after a time longer than the end of the no modulation transmission 5a of the radio equipment A. Thus, since the transmission radio wave duplicated period 1C where both the radio communication equipments A, B are in sending state exists without fail, the occurrence of the radio wave blank period is prevented.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は各種の無線データ伝送装置の送信・受信切換え
動作時の無線電波空白期間における混信防止単信無線通
信方式に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a simplex wireless communication system for preventing interference during a radio wave blank period during transmission/reception switching operations of various wireless data transmission devices.

〔発明の概要〕[Summary of the invention]

本発明はデータ伝送を目的とする単信方式の無線通信機
において、電波有無検出機能を設けると共に送信・受信
切換え動作時に無変調の無線電波が無線通信機（Ａ）（
Ｂ）の両者から送出されることにより、無線電波空白期
間を無くし他の無線通信機が同一無線チャネルに電波の
発射をすることも防止するようにした。The present invention provides a simplex type wireless communication device for the purpose of data transmission, which is equipped with a function to detect the presence of radio waves, and when switching between transmission and reception, unmodulated radio waves are transmitted to the wireless communication device (A).
By transmitting from both of B), it is possible to eliminate radio wave blank periods and prevent other radio communication devices from emitting radio waves on the same radio channel.

〔従来の技術〕[Conventional technology]

従来、単信方式の無線データ伝送装置においては、或一
つの無線チャネルを占有してデータ伝送を行なっている
が伝送されるデータの信頼性を向上する手段として一方
的なデータの転送だけでなく複数回のデータの授受を行
なっている。しかし、このデータの授受切換え時即ち、
送信・受信切換え動作時においては必ず該占有無線ヂャ
ネルには無線電波が発射されていない空白期間が生じて
しまうものであった。Conventionally, in simplex wireless data transmission equipment, data is transmitted by occupying one wireless channel, but as a means to improve the reliability of transmitted data, it is possible to not only unilaterally transfer data. Data is sent and received multiple times. However, when switching between sending and receiving this data, that is,
During a transmission/reception switching operation, there always occurs a blank period during which no radio waves are emitted from the occupied radio channel.

以下に従来の単信方式の２台の無線通信機り。Below are two conventional simplex wireless communication devices.

Ｅの動作状態を時間的に表わしたものを第２図にそって
説明する。A temporal representation of the operating state of E will be explained with reference to FIG.

今、一方の無線通信機りに接続動作開始信号１ｄが入力
されると無線通信機りは電波有無検出動作２ｄを行ない
、その無線チャネルに電波が発射されていないと判断す
ると送信動作３ｄを開始しデータ信号４ｄを送出する。Now, when the connection operation start signal 1d is input to one of the wireless communication devices, the wireless communication device performs the radio wave presence/absence detection operation 2d, and if it determines that no radio waves are emitted to that wireless channel, it starts the transmission operation 3d. and sends out a data signal 4d.

このときデータ信号４ｄの送出が終了すると無線通信機
りは直ちに受信動作６ｄに移る。At this time, when the sending of the data signal 4d is completed, the wireless communication device immediately moves to the receiving operation 6d.

一方、相手の無線通信機Ｅは無線通信機りからのデータ
信号４ｄを受信し終わると、或時間経過後送信動作１ｅ
を開始し、データ信号２ｄを送出する。以後無線通信１
ｌｌＥの送信動作１ｅから無線通信１ｆｉＤの送信動作
３ｄに移る時においても同様の動作状態の変遷手順を行
なう。On the other hand, when the other party's wireless communication device E finishes receiving the data signal 4d from the wireless communication device E, after a certain period of time has elapsed, it starts the transmission operation 1e.
and sends out the data signal 2d. From now on, wireless communication 1
A similar operation state transition procedure is performed when moving from the LLE transmission operation 1e to the wireless communication 1fiD transmission operation 3d.

上記のことより無線通信機り、Ｅの通信状態においては
必ず無線電波空白期間１ｆが発生することとなってしま
う。As a result of the above, a wireless radio wave blank period 1f always occurs in the communication state of the wireless communication device E.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

しかし上述のごとき従来の単信方式の無線データ伝送装
置では、前記無線電波の発射されていない無線電波空白
期間においては、伯の無線通信機にとってその無線チャ
ネルが使用されているという事実を知らしめる手段はな
く、他の無線通信機への妨害を防止する為の電波有無検
出機能は有効に機能することができなかった。However, in the conventional simplex type wireless data transmission device as described above, during the radio wave blank period when radio waves are not being emitted, it is not possible to notify the wireless communication device of the wireless communication device that the wireless channel is being used. There was no way to do so, and the radio wave presence detection function, which was designed to prevent interference with other wireless communication devices, could not function effectively.

そこで本発明は従来のこのような欠点を解決する為に、
単信方式の無線通信機において、データの授受に伴う送
信・受信切換え動作時に無線電波空白期間をなくし、混
信を防止することを目的としている。Therefore, in order to solve these conventional drawbacks, the present invention
In simplex wireless communication equipment, the purpose is to eliminate radio wave blank periods during transmission/reception switching operations associated with data exchange, and to prevent interference.

〔問題点を解決するための手段〕[Means for solving problems]

上記問題点を解決するために、本発明においては、個々
の無線通信機に電波有無機能を設けると共に、一方の無
線通信機のデータ送信が終了し、他方の無線通信機のデ
ータ送信が開始される迄の期間に両者が共に搬送波のみ
の無変調状態での送信状態となる期間を設けることで他
の通信機が同一無線チャネルに介入することを防止する
ようにした。In order to solve the above problems, in the present invention, each wireless communication device is provided with a radio wave presence/absence function, and the data transmission of one wireless communication device is completed and the data transmission of the other wireless communication device is started. By providing a period during which both devices transmit only carrier waves in an unmodulated state, it is possible to prevent other communication devices from interfering with the same radio channel.

〔作用〕[Effect]

上記のような構成によれば、単信方式の無線通信機にお
いてもデータ伝送の授受切換え時に無線電波空白期間が
生ずることはなく、従って他の無線通信機にとっては電
波有無検出機能が有効に機能し、同一無線チャネルに介
入して混信を起こすことが避けられる。According to the above configuration, even in a simplex wireless communication device, a wireless radio wave blank period does not occur when switching between sending and receiving data transmission, and therefore, the radio wave presence detection function functions effectively for other wireless communication devices. However, it is possible to avoid interfering with the same radio channel and causing interference.

〔実施例〕〔Example〕

以下に本発明の実施例を図面に基づいて説明する。第１
図においてＡ、Ｂはデータ伝送を行なう単信方式の２台
の無線通信機の動作状態を時間的に表わしたものである
。Embodiments of the present invention will be described below based on the drawings. 1st
In the figure, A and B temporally represent the operating states of two simplex wireless communication devices that perform data transmission.

今、一方の無線通信１！Ａに接続動作開始信号１ａが入
力されると無線通信機Ａは電波有無検出動作２ａを行な
い、その無線チャネルに電波が発射されていないと判断
すると送信動作３ａを開始しデータ信号４ａを送出する
。このときデータ信号４ａの送出が終了しても無線通信
機へは直ちに受信動作６ａに移らずに無変調送信動作５
ａを或る時間だけ行なう。Now, one side wireless communication 1! When the connection operation start signal 1a is input to A, the wireless communication device A performs a radio wave presence detection operation 2a, and if it determines that no radio waves are emitted to that wireless channel, it starts a transmission operation 3a and sends out a data signal 4a. . At this time, even if the sending of the data signal 4a is completed, the data signal 4a does not immediately proceed to the receiving operation 6a, but is sent to the wireless communication device via the non-modulated transmitting operation 5.
Do step a for a certain amount of time.

一方、相手の無線通信機Ｂは無線通信ｔｌＪＩＡからの
データ信号４ａを受信し終わると、無線通信機Ａの無変
調送信動作５ａの期間が完了するよりも短い時間で送信
動作１ｂを開始し、さらに無線通信機Ａの無変調送信動
作５ａが完了するよりも長い時間後にデータ信号２ｂを
送出する。以後無線通信機Ｂの送信動作１ｂから無線通
信１１Ａの送信動作３ａに移る時においても同様の動作
状態の変遷手順を行なう。上記のことにより無線通信ｍ
Ａ及び無線通信機８の両者がともに送信状態となる送信
電波重複期間１Ｇが必ず存在することになる為に、第２
図に示す無線電波空白期間１ｆが発生することを防止で
きる。On the other hand, when the other party's wireless communication device B finishes receiving the data signal 4a from the wireless communication tlJIA, it starts the transmission operation 1b in a shorter time than the period of the non-modulation transmission operation 5a of the wireless communication device A is completed, Further, the data signal 2b is sent out after a period longer than when the non-modulated transmission operation 5a of the wireless communication device A is completed. Thereafter, when moving from the transmission operation 1b of the wireless communication device B to the transmission operation 3a of the wireless communication 11A, the same operation state transition procedure is performed. Due to the above, wireless communication m
Since there is always a transmission radio wave overlap period 1G in which both A and the wireless communication device 8 are in the transmitting state, the second
It is possible to prevent the radio wave blank period 1f shown in the figure from occurring.

第３図において、制御部１は接続動作開始信号９が入力
されると受信制御信号３を送出し受信部２を動作状態に
する。受信部２は電波有無検出回路５を通じて電波有無
信号４を制御部１に送る。In FIG. 3, when a connection operation start signal 9 is input, the control section 1 sends out a reception control signal 3 to put the reception section 2 into an operating state. The receiving section 2 sends a radio wave presence/absence signal 4 to the control section 1 through the radio wave presence detection circuit 5 .

この時、制御部１は電波が無いと判断すると送信部６に
対して送信制御信号７を送出し送信部６を動作状態とし
て、ある一定時間経過後に送信データ信号８を送出し、
この送信データ信号８の送出が終了するとある一定時間
経過後に送信制御信号７を送出し送信部６の動作を停止
し受信動作とする。At this time, if the control section 1 determines that there is no radio wave, it sends out a transmission control signal 7 to the transmission section 6, puts the transmission section 6 into an operating state, and after a certain period of time has passed, sends out a transmission data signal 8.
When the transmission of the transmission data signal 8 is completed, a transmission control signal 7 is transmitted after a certain period of time has elapsed, and the operation of the transmission section 6 is stopped to perform a reception operation.

〔発明の効果〕〔Effect of the invention〕

本発明は以上説明したよ、うに、単信方式に簡単な動作
を追加するだけで混信を防止できると共に、電波有無検
出機能を有する他の無線通信機にとっても誤って無線チ
ャネルが未使用であると判断することを防止でき無駄な
電波の使用を回避できることになる。As explained above, the present invention can prevent interference by simply adding a simple operation to the simplex system, and can also prevent other wireless communication devices having a radio wave presence/absence detection function from mistakenly leaving a wireless channel unused. Therefore, it is possible to prevent unnecessary use of radio waves.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の実施例を示す動作変遷図、第２図は従
来の技術における動作変遷図、第３図は本発明の実施例
を示すブロック図である。 Ａ、Ｂ、Ｄ、Ｅ・・・単信方式の無線通信機、１ａ。 １ｄ、９・・・接続動作開始信号、２ａ、２ｄ・・・電
波有無検出動作、３ａ、ｉｂ、３ｄ、１ｅ・・・送信動
作、４ａ、２ｂ、４ｄ、２ｅ−・・データ信号、５ａ・
・・無変調送信動作、１Ｇ・・・送信電波重複期間、１
ｆ・・・無線電波空白期間、１・・・制御部、２・・・
受信部、３・・・送信部、５・・・電波有無検出回路、
４・・・電波有無信号である。FIG. 1 is an operational transition diagram showing an embodiment of the present invention, FIG. 2 is an operational transition diagram of a conventional technique, and FIG. 3 is a block diagram showing an embodiment of the present invention. A, B, D, E... Simplex wireless communication device, 1a. 1d, 9... Connection operation start signal, 2a, 2d... Radio wave presence detection operation, 3a, ib, 3d, 1e... Transmission operation, 4a, 2b, 4d, 2e-... Data signal, 5a.
・・Unmodulated transmission operation, 1G ・・Transmission radio wave overlap period, 1
f... Radio wave blank period, 1... Control unit, 2...
Receiving section, 3... Transmitting section, 5... Radio wave presence/absence detection circuit,
4... Radio wave presence/absence signal.

Claims (2)

【特許請求の範囲】[Claims] （１）データ伝送を目的とする単信方式の無線通信機に
おいて、電波有無検出機能を設けると共に、或る１つの
無線チャネルを占有してデータの授受を行なう場合に無
線電波がとぎれることなく相互の通信が行なわれること
を特徴とする混信防止単信無線通信方式。(1) In a simplex wireless communication device for the purpose of data transmission, it is equipped with a function to detect the presence or absence of radio waves, and when exchanging data by occupying a certain radio channel, it is possible to mutually communicate without interruption of the radio waves. An interference-preventing simplex wireless communication system characterized by the following: （２）前記無線通信機において、一方の通信機が送信状
態にあって一区切りのデータの送出が終了した時点で直
ちに無線電波の送出を止めずに無変調の状態で或る一定
時間だけ送信動作を継続し、他方の通信機は該無変調の
無線電波の送出時間が終了する時間よりも短かい時間で
送信動作を開始することを特徴とする特許請求の範囲第
１項の混信防止単信無線通信方式。(2) In the wireless communication device, when one of the communication devices is in a transmitting state and the sending of one section of data is finished, the sending of radio waves is not stopped immediately, but the transmitting operation is performed for a certain period of time in an unmodulated state. The interference prevention simplex according to claim 1, characterized in that the other communication device starts the transmission operation in a time shorter than the time when the transmission time of the unmodulated radio waves ends. Wireless communication method.