JP3477454B2

JP3477454B2 - Wireless communication system and wireless communication method

Info

Publication number: JP3477454B2
Application number: JP2001101948A
Authority: JP
Inventors: 栄藤巻
Original assignee: Asahi Kasei Corp
Current assignee: Asahi Kasei Corp
Priority date: 2001-03-30
Filing date: 2001-03-30
Publication date: 2003-12-10
Anticipated expiration: 2021-03-30
Also published as: JP2002300630A

Description

Detailed Description of the Invention

【０００１】[0001]

【発明の属する技術分野】本発明は、無線通信システム
および無線通信方法に関する。TECHNICAL FIELD The present invention relates to a wireless communication system and a wireless communication method.

【０００２】さらに詳述すると、本発明は、親機と複数
の子機との間で、複数の狭帯域無線チャネルを共用して
通信を行う無線通信システムおよび無線通信方法に関す
る。More specifically, the present invention relates to a wireless communication system and a wireless communication method for performing communication by sharing a plurality of narrow band wireless channels between a master unit and a plurality of slave units.

【０００３】[0003]

【従来の技術】特定小電力無線など、複数の無線機が複
数の狭帯域チャネルを共用する無線通信システムとし
て、従来から、受信機のほうで、送信で使用される可能性のある全チ
ャネルを時系列的に順次モニタし、送信機がどのチャネ
ルを使用して送信しても受信できるようにする無定位循
環方式；あるいは、回線制御のための専用チャネルを設け、親機と子機間
で通信チャネルを調整した後に、通信を行う共通線制御
方式：が広く知られている。従来から知られているその
他の方式として、例えば「セキュリティ無線システム」
（特開平６−２９１７２３号公報参照）として提案され
ているような、親機が送信で使用される可能性のある全チャネルを順
次キャリアセンスしてチャネルの使用状況を調べ、最も
通信トラヒック量の少ないチャネルを選択して通信チャ
ネルとして設定することを定期的に行う方式がある。2. Description of the Related Art As a radio communication system in which a plurality of radios share a plurality of narrow band channels such as a specific low power radio, conventionally, a receiver uses all channels that may be used for transmission. A non-stationary circulation system that monitors sequentially in time series so that the transmitter can receive regardless of which channel is used; or, by providing a dedicated channel for line control, between the master and slave units A common line control method for performing communication after adjusting a communication channel is widely known. As another method known from the past, for example, "security wireless system"
(See Japanese Laid-Open Patent Publication No. 6-291723), the master unit sequentially carries out carrier sense on all channels that may be used for transmission, and checks the channel usage status to determine the maximum communication traffic volume. There is a method of periodically selecting a small number of channels and setting them as communication channels.

【０００４】[0004]

【発明が解決しようとする課題】しかしながら、上記
で述べた無定位循環方式では、受信側で待ち受けるチャ
ネル数が多いほどシステム間のチャネル競合が減少する
というメリットを有する反面、周波数切り換えに時間が
かかることから、送信機を識別するための制御コード
を、待ち受けるチャネル数に比例して長くとらないと確
実に通信できず、その結果として、送信機側において本
来のデータ以外の送信で電力を消費してしまうという問
題があった。However, the above-mentioned atypical circulation method has an advantage that the channel competition between the systems decreases as the number of channels waiting on the receiving side increases, but it takes time to switch the frequency. Therefore, unless the control code for identifying the transmitter is set to be long in proportion to the number of channels to wait, reliable communication cannot be performed, and as a result, the transmitter consumes power for transmission other than the original data. There was a problem that it would end up.

【０００５】また、で述べた共通線制御方式では、本
来送信しようとしているデータ以外にも、チャネル調整
のための通信が必要となるので、電力を余計に消費して
しまうという問題があった。また、回線制御チャネルが
使用できない場合も考えられるので、信頼性の高い通信
を実現しようとすると、処理が非常に複雑になってしま
うという不都合もみられた。Further, the common line control method described in 1 above has a problem in that power is excessively consumed because communication for channel adjustment is required in addition to data to be originally transmitted. Further, since it may be possible that the line control channel cannot be used, there has been an inconvenience that the processing becomes very complicated when trying to realize highly reliable communication.

【０００６】さらに、で述べた「セキュリティ無線シ
ステム」（特開平６−２９１７２３号公報参照）に代表
されるような方式では、システム間のチャネル競合の回
数を大幅に削減することが期待できるが、親機と子機の
間で設定されている通信チャネルは一つであるため、も
し何らかの理由でそのチャネルが使用できなくなった場
合には通信が不能になってしまうという問題があった。
しかも、チャネルを切り換えながら順次キャリアセンス
を行う方式であるので、チャネル数が増えるとキャリア
センスを行う周期が非常に長くなってしまうという問題
も生じてくる。その結果、例えば他システムからのデー
タが短いパケット形式の場合には、そのデータを検出で
きない可能性も生じてしまう。Further, in the system represented by the "security wireless system" (see Japanese Patent Application Laid-Open No. 6-291723) mentioned above, it is expected that the number of channel competitions between the systems can be greatly reduced. Since there is only one communication channel set between the master unit and the slave unit, there is a problem that communication is disabled if the channel becomes unavailable for some reason.
Moreover, since the method is one in which carrier sensing is performed sequentially while switching channels, there arises a problem that the cycle of carrier sensing becomes extremely long as the number of channels increases. As a result, for example, when data from another system is in a short packet format, there is a possibility that the data cannot be detected.

【０００７】よって本発明の目的は、上述の点に鑑み、
短時間で通信チャネルが確定でき、低消費電力であっ
て、且つ、信頼性の高い無線通信システムおよび無線通
信方法を提供することにある。Accordingly, in view of the above points, the object of the present invention is to
It is an object of the present invention to provide a wireless communication system and a wireless communication method that can establish a communication channel in a short time, consume less power, and have high reliability.

【０００８】[0008]

【課題を解決するための手段】上記の目的を達成するた
めに、請求項１に係る本発明は、親機と複数の子機との
間で、複数の狭帯域無線チャネルを共用して通信を行う
無線通信システムであって、前記子機は、使用可能な全
チャネルの中から予め割り当てられた複数の通信用チャ
ネルのうち、特定の空きチャネルを介して、所定の検知
手段から出力される検知情報を前記親機に送信する狭帯
域送信手段と、前記特定の空きチャネルを介して前記親
機から送信されてくるチャネル制御情報を受信する狭帯
域受信手段とを備え、前記親機は、前記複数の通信用チ
ャネルを順次スキャンして前記子機から送信されてくる
信号を受信する狭帯域受信手段と、前記使用可能な全チ
ャネルの電波使用状況を監視する広帯域受信手段と、前
記広帯域受信手段により監視された電波使用状況に基づ
いて、前記通信用チャネルの割り当て変更を行う制御手
段と、前記通信用チャネルの割り当て変更を前記チャネ
ル制御情報として前記子機に通知する狭帯域送信手段と
を備え、前記親機の前記制御手段は、所定期間内に前記
広帯域受信手段から出力された信号強度を、前記使用可
能な全チャネルの各チャネル毎に足し合わせたとき、そ
の合計値が予め設定されたしきい値よりも大きい場合で
あって、且つ、前記親機と前記子機がその期間にそのチ
ャネルを使用していない場合には、そのチャネルに妨害
波が存在すると判定するものである。請求項２に係る本
発明は、親機と複数の子機との間で、複数の狭帯域無線
チャネルを共用して通信を行う無線通信システムであっ
て、前記子機は、使用可能な全チャネルの中から予め割
り当てられた複数の通信用チャネルのうち、特定の空き
チャネルを介して、所定の検知手段から出力される検知
情報を前記親機に送信する狭帯域送信手段と、前記特定
の空きチャネルを介して前記親機から送信されてくるチ
ャネル制御情報を受信する狭帯域受信手段とを備え、前
記親機は、前記複数の通信用チャネルを順次スキャンし
て前記子機から送信されてくる信号を受信する狭帯域受
信手段と、前記使用可能な全チャネルの電波使用状況を
監視する広帯域受信手段と、前記広帯域受信手段により
監視された電波使用状況に基づいて、前記通信用チャネ
ルの割り当て変更を行う制御手段と、前記通信用チャネ
ルの割り当て変更を前記チャネル制御情報として前記子
機に通知する狭帯域送信手段とを備え、前記親機の前記
広帯域受信手段は、前記使用可能なチャネルを含む広帯
域受信信号をデジタル信号に変換して定期的にフーリエ
変換し、そのパワースペクトルから各チャネル毎の信号
強度を求め、これらを前記電波使用状況を表す情報とし
て前記制御手段に供給し、前記制御手段は、所定期間内
に前記広帯域受信手段から出力された信号強度を、前記
使用可能な全チャネルの各チャネル毎に足し合わせたと
き、その合計値が予め設定されたしきい値よりも大きい
場合であって、且つ、前記親機と前記子機がその期間に
そのチャネルを使用していない場合には、そのチャネル
に妨害波が存在すると判定するものである。請求項３に
係る本発明は、請求項１または２に係る無線通信システ
ムにおいて、初期状態の通信用チャネルについては、互
いの通信用チャネルが所定数のチャネル間隔以上離れる
ように割り当てておき、前記制御手段は、現在の通信用
チャネルに妨害波が存在するとき、現在の通信用チャネ
ルから所定数のチャネル間隔以上離れ、且つ妨害波が存
在しないチャネルを見つけた場合、妨害波が存在しない
チャネル中で信号強度の累積値が最も小さいチャネル
を、妨害波が存在する通信用チャネルに替えて、新たな
通信用チャネルとして割り当てる。請求項４に係る本発
明は、親機と複数の子機との間で、複数の狭帯域無線チ
ャネルを共用して通信を行う無線通信システムであっ
て、前記子機は、使用可能な全チャネルの中から予め割
り当てられた複数の通信用チャネルのうち、特定の空き
チャネルを介して、所定の検知手段から出力される検知
情報を前記親機に送信する狭帯域送信手段と、前記特定
の空きチャネルを介して前記親機から送信されてくるチ
ャネル制御情報を受信する狭帯域受信手段とを備え、前
記親機は、前記複数の通信用チャネルを順次スキャンし
て前記子機から送信されてくる信号を受信する狭帯域受
信手段と、前記使用可能な全チャネルの電波使用状況を
監視する広帯域受信手段と、前記広帯域受信手段により
監視された電波使用状況に基づいて、前記通信用チャネ
ルの割り当て変更を行う制御手段と、前記通信用チャネ
ルの割り当て変更を前記チャネル制御情報として前記子
機に通知する狭帯域送信手段とを備え、前記子機は、割
り当てられた複数の通信用チャネルが全て妨害波により
使用できない場合、予め定めた順番でチャネルを切り換
え、各チャネルで決められた長さのデータを前記親機に
送信して異常状態を通知し、前記親機は、前記広帯域受
信手段を使用して前記子機の異常状態を検知するもので
ある。請求項５に係る本発明は、親機と複数の子機との
間で、複数の狭帯域無線チャネルを共用して通信を行う
無線通信システムであって、前記子機は、使用可能な全
チャネルの中から予め割り当てられた複数の通信用チャ
ネルのうち、特定の空きチャネルを介して、所定の検知
手段から出力される検知情報を前記親機に送信する狭帯
域送信手段と、前記特定の空きチャネルを介して前記親
機から送信されてくるチャネル制御情報を受信する狭帯
域受信手段とを備え、前記親機は、前記複数の通信用チ
ャネルを順次スキャンして前記子機から送信されてくる
信号を受信する狭帯域受信手段と、前記使用可能な全チ
ャネルの電波使用状況を監視する広帯域受信手段と、前
記広帯域受信手段により監視された電波使用状況に基づ
いて、前記通信用チャネルの割り当て変更を行う制御手
段と、前記通信用チャネルの割り当て変更を前記チャネ
ル制御情報として前記子機に通知する狭帯域送信手段と
を備え、前記親機の前記広帯域受信手段は、前記使用可
能なチャネルを含む広帯域受信信号をデジタル信号に変
換して定期的にフーリエ変換し、そのパワースペクトル
から各チャネル毎の信号強度を求め、これらを前記電波
使用状況を表す情報として前記制御手段に供給し、前記
子機は、割り当てられた複数の通信用チャネルが全て妨
害波により使用できない場合、予め定めた順番でチャネ
ルを切り換え、各チャネルで決められた長さのデータを
前記親機に送信して異常状態を通知し、前記親機は、前
記広帯域受信手段を使用して前記子機の異常状態を検知
するものである。請求項６に係る本発明は、親機と複数
の子機との間で、複数の狭帯域無線チャネルを共用して
通信を行う無線通信方法であって、前記子機は、使用可
能な全チャネルの中から予め割り当てられた複数の通信
用チャネルのうち、特定の空きチャネルを介して、所定
の検知手段から出力される検知情報を前記親機に送信す
る狭帯域送信手段と、前記特定の空きチャネルを介して
前記親機から送信されてくるチャネル制御情報を受信す
る狭帯域受信手段とを備え、前記親機は、前記複数の通
信用チャネルを順次スキャンして前記子機から送信され
てくる信号を受信する狭帯域受信手段と、前記使用可能
な全チャネルの電波使用状況を監視する広帯域受信手段
と、前記広帯域受信手段により監視された電波使用状況
に基づいて、前記通信用チャネルの割り当て変更を行う
制御手段と、前記通信用チャネルの割り当て変更を前記
チャネル制御情報として前記子機に通知する狭帯域送信
手段とを備え、前記親機の前記制御手段は、所定期間内
に前記広帯域受信手段から出力された信号強度を、前記
使用可能な全チャネルの各チャネル毎に足し合わせたと
き、その合計値が予め設定されたしきい値よりも大きい
場合であって、且つ、前記親機と前記子機がその期間に
そのチャネルを使用していない場合には、そのチャネル
に妨害波が存在すると判定するものである。請求項７に
係る本発明は、親機と複数の子機との間で、複数の狭帯
域無線チャネルを共用して通信を行う無線通信方法であ
って、前記子機は、使用可能な全チャネルの中から予め
割り当てられた複数の通信用チャネルのうち、特定の空
きチャネルを介して、所定の検知手段から出力される検
知情報を前記親機に送信する狭帯域送信手段と、前記特
定の空きチャネルを介して前記親機から送信されてくる
チャネル制御情報を受信する狭帯域受信手段とを備え、
前記親機は、前記複数の通信用チャネルを順次スキャン
して前記子機から送信されてくる信号を受信する狭帯域
受信手段と、前記使用可能な全チャネルの電波使用状況
を監視する広帯域受信手段と、前記広帯域受信手段によ
り監視された電波使用状況に基づいて、前記通信用チャ
ネルの割り当て変更を行う制御手段と、前記通信用チャ
ネルの割り当て変更を前記チャネル制御情報として前記
子機に通知する狭帯域送信手段とを備え、前記親機の前
記広帯域受信手段は、前記使用可能なチャネルを含む広
帯域受信信号をデジタル信号に変換して定期的にフーリ
エ変換し、そのパワースペクトルから各チャネル毎の信
号強度を求め、これらを前記電波使用状況を表す情報と
して前記制御手段に供給し、前記制御手段は、所定期間
内に前記広帯域受信手段から出力された信号強度を、前
記使用可能な全チャネルの各チャネル毎に足し合わせた
とき、その合計値が予め設定されたしきい値よりも大き
い場合であって、且つ、前記親機と前記子機がその期間
にそのチャネルを使用していない場合には、そのチャネ
ルに妨害波が存在すると判定するものである。請求項８
に係る本発明は、請求項６または７に係る無線通信方法
において、初期状態の通信用チャネルについては、互い
の通信用チャネルが所定数のチャネル間隔以上離れるよ
うに割り当てておき、前記制御手段は、現在の通信用チ
ャネルに妨害波が存在するとき、現在の通信用チャネル
から所定数のチャネル間隔以上離れ、且つ妨害波が存在
しないチャネルを見つけた場合、妨害波が存在しないチ
ャネル中で信号強度の累積値が最も小さいチャネルを、
妨害波が存在する通信用チャネルに替えて、新たな通信
用チャネルとして割り当てる。請求項９に係る本発明
は、親機と複数の子機との間で、複数の狭帯域無線チャ
ネルを共用して通信を行う無線通信方法であって、前記
子機は、使用可能な全チャネルの中から予め割り当てら
れた複数の通信用チャネルのうち、特定の空きチャネル
を介して、所定の検知手段から出力される検知情報を前
記親機に送信する狭帯域送信手段と、前記特定の空きチ
ャネルを介して前記親機から送信されてくるチャネル制
御情報を受信する狭帯域受信手段とを備え、前記親機
は、前記複数の通信用チャネルを順次スキャンして前記
子機から送信されてくる信号を受信する狭帯域受信手段
と、前記使用可能な全チャネルの電波使用状況を監視す
る広帯域受信手段と、前記広帯域受信手段により監視さ
れた電波使用状況に基づいて、前記通信用チャネルの割
り当て変更を行う制御手段と、前記通信用チャネルの割
り当て変更を前記チャネル制御情報として前記子機に通
知する狭帯域送信手段とを備え、前記子機は、割り当て
られた複数の通信用チャネルが全て妨害波により使用で
きない場合、予め定めた順番でチャネルを切り換え、各
チャネルで決められた長さのデータを前記親機に送信し
て異常状態を通知し、前記親機は、前記広帯域受信手段
を使用して前記子機の異常状態を検知するものである。
請求項１０に係る本発明は、親機と複数の子機との間
で、複数の狭帯域無線チャネルを共用して通信を行う無
線通信方法であって、前記子機は、使用可能な全チャネ
ルの中から予め割り当てられた複数の通信用チャネルの
うち、特定の空きチャネルを介して、所定の検知手段か
ら出力される検知情報を前記親機に送信する狭帯域送信
手段と、前記特定の空きチャネルを介して前記親機から
送信されてくるチャネル制御情報を受信する狭帯域受信
手段とを備え、前記親機は、前記複数の通信用チャネル
を順次スキャンして前記子機から送信されてくる信号を
受信する狭帯域受信手段と、前記使用可能な全チャネル
の電波使用状況を監視する広帯域受信手段と、前記広帯
域受信手段により監視された電波使用状況に基づいて、
前記通信用チャネルの割り当て変更を行う制御手段と、
前記通信用チャネルの割り当て変更を前記チャネル制御
情報として前記子機に通知する狭帯域送信手段とを備
え、前記親機の前記広帯域受信手段は、前記使用可能な
チャネルを含む広帯域受信信号をデジタル信号に変換し
て定期的にフーリエ変換し、そのパワースペクトルから
各チャネル毎の信号強度を求め、これらを前記電波使用
状況を表す情報として前記制御手段に供給し、前記子機
は、割り当てられた複数の通信用チャネルが全て妨害波
により使用できない場合、予め定めた順番でチャネルを
切り換え、各チャネルで決められた長さのデータを前記
親機に送信して異常状態を通知し、前記親機は、前記広
帯域受信手段を使用して前記子機の異常状態を検知する
ものである。In order to achieve the above object, the present invention according to claim 1 communicates between a master unit and a plurality of slave units by sharing a plurality of narrow band radio channels. In the wireless communication system for performing the above, the slave is output from a predetermined detection unit via a specific idle channel among a plurality of communication channels pre-allocated from all available channels. A narrowband transmission unit that transmits detection information to the master unit, and a narrowband reception unit that receives channel control information transmitted from the master unit via the specific idle channel, the master unit, Narrowband receiving means for sequentially scanning the plurality of communication channels to receive signals transmitted from the slave unit, wideband receiving means for monitoring radio wave usage conditions of all available channels, and wideband receiving means means A control means for changing the allocation of the communication channel based on the monitored radio wave usage condition, and a narrow band transmitting means for notifying the slave unit of the change of the communication channel allocation as the channel control information. When the control means of the master unit adds up the signal strengths output from the broadband receiving means within a predetermined period for each of the available channels, the total value is preset. When it is larger than the threshold value and when the master unit and the slave unit are not using the channel during the period, it is determined that an interference wave exists in the channel. The present invention according to claim 2 is a wireless communication system for performing communication by sharing a plurality of narrowband wireless channels between a master unit and a plurality of slave units, wherein the slave units are all usable. Narrowband transmission means for transmitting detection information output from a predetermined detection means to the parent device via a specific idle channel among a plurality of communication channels pre-allocated from among the channels; A narrowband receiving means for receiving channel control information transmitted from the master unit through an idle channel, the master unit sequentially scanning the plurality of communication channels to be transmitted from the slave unit. The narrowband receiving means for receiving the incoming signal, the wideband receiving means for monitoring the radio wave usage status of all the available channels, and the communication channel based on the radio wave usage status monitored by the wideband receiving means. Control means for changing the allocation of the communication channel, and narrowband transmission means for notifying the slave unit of the change of the communication channel allocation as the channel control information, and the wideband receiving means of the master device is usable. Convert a wideband received signal including channels to a digital signal and perform Fourier transform on a regular basis, determine the signal strength for each channel from its power spectrum, and supply these to the control means as information indicating the radio wave usage status, The control means, when the signal strength output from the wideband receiving means within a predetermined period is added for each of the available channels, the total value is greater than a preset threshold value. If it is large, and if the master unit and the slave unit are not using the channel during the period, there is an interference wave on the channel. It is intended to determine that. According to a third aspect of the present invention, in the wireless communication system according to the first or second aspect, the communication channels in the initial state are allocated such that the communication channels are separated from each other by a predetermined number of channel intervals or more. When there is an interfering wave in the current communication channel, the control means finds a channel that is separated from the current communication channel by a predetermined number of channel intervals or more and has no interfering wave. The channel with the smallest cumulative value of the signal strength is replaced with the communication channel in which the interference wave exists, and is assigned as a new communication channel. According to a fourth aspect of the present invention, there is provided a wireless communication system in which a master unit and a plurality of slave units share a plurality of narrow band wireless channels for communication, and the slave units are all usable. Narrowband transmission means for transmitting detection information output from a predetermined detection means to the parent device via a specific idle channel among a plurality of communication channels pre-allocated from among the channels; A narrowband receiving means for receiving channel control information transmitted from the master unit through an idle channel, the master unit sequentially scanning the plurality of communication channels to be transmitted from the slave unit. The narrowband receiving means for receiving the incoming signal, the wideband receiving means for monitoring the radio wave usage status of all the available channels, and the communication channel based on the radio wave usage status monitored by the wideband receiving means. Control means for changing the allocation of the communication channels, and a narrowband transmission means for notifying the slave unit of the allocation change of the communication channels as the channel control information, wherein the slave unit has a plurality of allocated communication channels. If all cannot be used due to the interfering waves, the channels are switched in a predetermined order, data of a predetermined length for each channel is transmitted to the master unit to notify the abnormal state, and the master unit is configured to use the broadband receiving means. Is used to detect an abnormal state of the slave unit. The present invention according to claim 5 is a wireless communication system for performing communication by sharing a plurality of narrowband wireless channels between a master unit and a plurality of slave units, wherein the slave units are all usable. Narrowband transmission means for transmitting detection information output from a predetermined detection means to the parent device via a specific idle channel among a plurality of communication channels pre-allocated from among the channels; A narrowband receiving means for receiving channel control information transmitted from the master unit through an idle channel, the master unit sequentially scanning the plurality of communication channels to be transmitted from the slave unit. The narrowband receiving means for receiving the incoming signal, the wideband receiving means for monitoring the radio wave usage status of all the available channels, and the communication channel based on the radio wave usage status monitored by the wideband receiving means. Control means for changing the allocation of the communication channel, and narrowband transmission means for notifying the slave unit of the change of the communication channel allocation as the channel control information, and the wideband receiving means of the master device is usable. Convert a wideband received signal including channels to a digital signal and perform Fourier transform on a regular basis, determine the signal strength for each channel from its power spectrum, and supply these to the control means as information indicating the radio wave usage status, If all of the assigned communication channels cannot be used due to interference waves, the slave unit switches channels in a predetermined order and transmits data of a length determined for each channel to the master unit, causing an abnormality. Notifying the status, the master unit detects the abnormal condition of the slave unit by using the broadband receiving means. The present invention according to claim 6 is a wireless communication method for performing communication between a master device and a plurality of slave devices by sharing a plurality of narrowband wireless channels, wherein the slave device is configured to be usable. Narrowband transmission means for transmitting detection information output from a predetermined detection means to the parent device via a specific idle channel among a plurality of communication channels pre-allocated from among the channels; A narrowband receiving means for receiving channel control information transmitted from the master unit through an idle channel, the master unit sequentially scanning the plurality of communication channels to be transmitted from the slave unit. Narrow band receiving means for receiving the incoming signal, wide band receiving means for monitoring the radio wave usage status of all the available channels, and based on the radio wave usage status monitored by the wide band receiving means, The control means for changing the allocation, and the narrow band transmission means for notifying the slave as the channel control information of the allocation change of the communication channel, the control means of the master, the control means within the predetermined period. When the signal strength output from the wideband receiving means is summed for each of the available channels, the total value is larger than a preset threshold value, and the parent If the machine and the slave are not using the channel during that period, it is determined that there is an interfering wave in the channel. The present invention according to claim 7 is a wireless communication method for performing communication between a master unit and a plurality of slave units by sharing a plurality of narrow band wireless channels, wherein the slave unit is a usable unit. Narrowband transmission means for transmitting detection information output from a predetermined detection means to the parent device via a specific idle channel among a plurality of communication channels pre-allocated from among the channels; A narrow band receiving means for receiving channel control information transmitted from the master unit via an idle channel,
The base unit has a narrow band receiving unit that sequentially scans the plurality of communication channels to receive signals transmitted from the slave unit, and a wide band receiving unit that monitors the radio wave usage status of all available channels. A control means for changing the allocation of the communication channel based on the radio wave usage status monitored by the wideband receiving means; and a narrowing means for notifying the slave unit of the change of the communication channel allocation as the channel control information. Band transmitting means, the wideband receiving means of the master unit converts a wideband received signal including the usable channels into a digital signal and periodically Fourier transforms the signal for each channel from its power spectrum. The strength is obtained, and these are supplied to the control means as the information indicating the radio wave usage state, and the control means receives the broadband reception within a predetermined period. When the signal strength output from the means is summed for each of the available channels, the total value is greater than a preset threshold value, and If the slave unit is not using that channel during that period, it is determined that there is an interfering wave in that channel. Claim 8
In the wireless communication method according to claim 6 or 7, the communication channel in the initial state is allocated such that the communication channels are separated from each other by a predetermined number of channel intervals or more, and the control means , When there is an interfering wave in the current communication channel, if a channel that is separated from the current communication channel by a predetermined number of channels or more and has no interfering wave is found, the signal strength in the channel without the interfering wave Channel with the smallest cumulative value of
It is assigned as a new communication channel in place of the communication channel in which the interference wave exists. The present invention according to claim 9 is a wireless communication method for performing communication between a master device and a plurality of slave devices by sharing a plurality of narrowband wireless channels, wherein the slave device is a device that can be used by all available devices. Narrowband transmission means for transmitting detection information output from a predetermined detection means to the parent device via a specific idle channel among a plurality of communication channels pre-allocated from among the channels; A narrowband receiving means for receiving channel control information transmitted from the master unit through an idle channel, the master unit sequentially scanning the plurality of communication channels to be transmitted from the slave unit. Narrow band receiving means for receiving the incoming signal, wide band receiving means for monitoring the radio wave usage status of all the available channels, and based on the radio wave usage status monitored by the wide band receiving means, Control means for making an allocation change, and a narrowband transmission means for notifying the slave as the channel control information of the communication channel allocation change, wherein the slave has a plurality of allocated communication channels. If all cannot be used due to the interfering waves, the channels are switched in a predetermined order, data of a predetermined length for each channel is transmitted to the master unit to notify the abnormal state, and the master unit is configured to use the broadband receiving means. Is used to detect an abnormal state of the slave unit.
The present invention according to claim 10 is a wireless communication method for performing communication between a master unit and a plurality of slave units by sharing a plurality of narrow-band wireless channels, wherein the slave units are all usable. Narrowband transmission means for transmitting detection information output from a predetermined detection means to the parent device via a specific idle channel among a plurality of communication channels pre-allocated from among the channels; A narrowband receiving means for receiving channel control information transmitted from the master unit through an idle channel, the master unit sequentially scanning the plurality of communication channels to be transmitted from the slave unit. Narrow band receiving means for receiving the incoming signal, wide band receiving means for monitoring the radio wave usage status of all the available channels, based on the radio wave usage status monitored by the broadband receiving means,
Control means for changing the allocation of the communication channel,
Narrowband transmission means for notifying the slave unit of the change of the allocation of the communication channel as the channel control information, wherein the wideband reception means of the master unit is a digital signal that is a wideband reception signal including the usable channels. The signal strength of each channel is obtained from the power spectrum of the signal, and these are supplied to the control means as information indicating the radio wave usage status. If all the communication channels can not be used due to interference waves, the channels are switched in a predetermined order, data of a length determined for each channel is transmitted to the master unit to notify the abnormal state, and the master unit is The abnormal state of the slave unit is detected using the broadband receiving means.

【０００９】[0009]

【００１０】[0010]

【００１１】[0011]

【００１２】[0012]

【００１３】[0013]

【００１４】[0014]

【００１５】[0015]

【００１６】[0016]

【００１７】[0017]

【００１８】[0018]

【発明の実施の形態】実施形態の概要本実施の形態では、複数の通信チャネルを使用する無定
位循環方式を基本とするが、通信チャネルの数を少なく
抑えて送信機を識別するための制御コードが長くなるこ
とを防ぐ一方、信頼性を上げるため、広帯域デジタル受
信機を用いて全チャネルの使用状況の監視を、高い時間
分解能で定期的に行い、妨害波が検出された場合は、通
信チャネルを変更し、常に他システムとの競合や妨害波
が少ない通信チャネルのみを使用できるように構成す
る。BEST MODE FOR CARRYING OUT THE INVENTION The outline of the present embodiment is based on an atypical circular system using a plurality of communication channels, but a control for identifying a transmitter by keeping the number of communication channels small. In order to prevent the code from becoming long and increase the reliability, the usage status of all channels is regularly monitored with a wideband digital receiver with high time resolution, and if an interference wave is detected, communication is performed. The channel is changed so that only the communication channel with less competition with other systems and interference is always used.

【００１９】さらに、複数の通信チャネルを分散して割
り当てることにより、周波数的に広がった一つの妨害波
に起因して、通信チャネル全体が影響を受けることを避
ける。Further, by allocating a plurality of communication channels in a distributed manner, it is possible to prevent the entire communication channel from being affected by one interference wave spread in frequency.

【００２０】実施形態の詳細な説明以下、図面を参照しながら本実施の形態を詳細に説明し
ていく。 Detailed Description of Embodiments Hereinafter, this embodiment will be described in detail with reference to the drawings.

【００２１】図１は、本実施の形態による無線通信シス
テムの動作原理を模式的に示した説明図である。本実施
の形態では、チャネル１〜チャネル４０の狭帯域伝送チ
ャネルを介して、複数の子機と、単一の親機が通信を行
う。親機は、図４を参照して後に詳述するように、それ
ぞれのチャネルをスキャンして通信する狭帯域送受信機
と、全チャネルを一括してモニタする広帯域受信機と、
通信チャネルの変更を決定する制御部とからなってい
る。FIG. 1 is an explanatory view schematically showing the operating principle of the wireless communication system according to this embodiment. In the present embodiment, a plurality of slave units and a single master unit communicate with each other via the narrow band transmission channels of channel 1 to channel 40. As will be described later in detail with reference to FIG. 4, the master device includes a narrow band transceiver that scans and communicates with each channel, and a wide band receiver that collectively monitors all channels,
And a control unit that determines the change of the communication channel.

【００２２】親機に含まれている広帯域受信機は、図１
の下方に示すように、チャネル１〜チャネル４０を含む
広帯域信号から得られる受信信号をＡ／Ｄ変換した後
に、ＦＦＴ解析により、各チャネルごとのスペクトル
（電力）を一括して検出する。The broadband receiver included in the master unit is shown in FIG.
As shown below, the received signals obtained from the wideband signals including the channels 1 to 40 are A / D-converted, and then the spectrum (power) for each channel is collectively detected by FFT analysis.

【００２３】本図に示した例では、通信チャネルとして
３チャネル（３ｃｈ）を割り当て、この３ｃｈの中から
空きチャネルを見つけて通信を行う。そして、親機は、
別途全チャネル（ｃｈ１〜ｃｈ４０）の電波使用状況を
常時モニタし、他システムとの衝突や妨害波を検出した
場合は、通信チャネルの割り当てを変更する。In the example shown in the figure, 3 channels (3 ch) are assigned as communication channels, and an empty channel is found from these 3 ch to perform communication. And the main unit is
Separately, the radio wave usage statuses of all channels (ch1 to ch40) are constantly monitored, and when a collision with another system or an interference wave is detected, the allocation of communication channels is changed.

【００２４】図２は、子機と親機の通信タイミングを例
示した説明図である。本図では、図示しない施錠センサ
からの検知情報を子機から定期的に（例えば１回／３０
分）送信する場合と、その施錠センサからの検知情報に
変化が生じた場合（例えば施錠／解錠の検知時）になさ
れる非定期送信を例示している。すなわち、本図の，
が定期的送信であり、が非定期送信を表している。FIG. 2 is an explanatory diagram exemplifying the communication timing between the slave unit and the master unit. In this figure, detection information from a lock sensor (not shown) is periodically (for example, once / 30
Minutes) and the non-periodical transmission performed when there is a change in the detection information from the lock sensor (for example, when lock / unlock is detected). That is, in this figure,
Indicates regular transmission, and indicates non-periodical transmission.

【００２５】図３は、図１に示した子機の詳細な構成を
示すブロック図である。本図において、２は子機アンテ
ナ、４はアンテナスイッチ、６は無線受信部、８は復調
部、１０は受信レベル検出部、１２は子機の内部もしく
は外部に設置されたセンサ部、１４は送受信制御部、１
６は変調部、１８は無線送信部、２０は局部発振部であ
る。これら子機側の動作は、後に図５を参照して詳細に
説明する。FIG. 3 is a block diagram showing a detailed configuration of the slave unit shown in FIG. In the figure, 2 is a slave antenna, 4 is an antenna switch, 6 is a wireless receiver, 8 is a demodulator, 10 is a reception level detector, 12 is a sensor installed inside or outside the slave, and 14 is Transmission / reception control unit, 1
6 is a modulator, 18 is a wireless transmitter, and 20 is a local oscillator. The operation of these slave units will be described later in detail with reference to FIG.

【００２６】図４は、図１に示した親機の詳細な構成を
示すブロック図である。本図において、３０は狭帯域送
受信アンテナ、３２はアンテナスイッチ、３４は無線受
信部、３６は復調部、３８は受信レベル検出部、４０は
送受信制御部、４２は変調部、４４は無線送信部、４６
は局部発振部であって、全体として狭帯域送受信機１０
０を構成している。FIG. 4 is a block diagram showing a detailed configuration of the master unit shown in FIG. In the figure, 30 is a narrow band transmission / reception antenna, 32 is an antenna switch, 34 is a wireless reception unit, 36 is a demodulation unit, 38 is a reception level detection unit, 40 is a transmission / reception control unit, 42 is a modulation unit, and 44 is a wireless transmission unit. , 46
Is a local oscillator, and as a whole, the narrow band transceiver 10
Configures 0.

【００２７】また、５０は広帯域受信アンテナ、５２は
無線受信部、５４はＦＦＴ解析を行う周波数解析部、５
６は演算部であって、全体として広帯域受信機２００を
構成している。３００は、制御部である。Further, 50 is a wideband receiving antenna, 52 is a radio receiving section, 54 is a frequency analysis section for performing FFT analysis, 5
Reference numeral 6 denotes a calculation unit, which constitutes the wideband receiver 200 as a whole. 300 is a control unit.

【００２８】これら親機側の動作は、後に図６，図７，
図８を参照して詳細に説明する。The operation on the base unit side will be described later with reference to FIGS.
This will be described in detail with reference to FIG.

【００２９】図５は、子機側の処理手順を示すフローチ
ャートである。FIG. 5 is a flow chart showing the processing procedure on the slave side.

【００３０】ステップＳ１では、初期割当てチャネルを
設定する。In step S1, an initial allocation channel is set.

【００３１】ステップＳ２では、所定の送信条件を満足
しているか否か（例えば、定期時間が経過したか？）を
判定する。In step S2, it is determined whether or not a predetermined transmission condition is satisfied (for example, whether the regular time has elapsed).

【００３２】ステップＳ３では、割り当てチャネル数が
小さいほうから順次キャリアセンスし、空きチャネルを
見つける。In step S3, carrier sensing is sequentially performed from the smallest allocated channel number to find an empty channel.

【００３３】ステップＳ４では、空きチャネルがあるか
否かを判定する。空きチャネルがない場合には（ステッ
プＳ４：ＮＯ）、ステップＳ５において、所定の異常処
理を行う。他方、空きチャネルがある場合には（ステッ
プＳ４：ＹＥＳ）、ステップＳ６に制御を進める。In step S4, it is determined whether there is a free channel. When there is no free channel (step S4: NO), a predetermined abnormality process is performed in step S5. On the other hand, if there is a free channel (step S4: YES), the control proceeds to step S6.

【００３４】ステップＳ６では、空きチャネルで、親機
に検知情報（ＩＤ情報を含む）を送信し、タイマーを起
動する。In step S6, the detection information (including ID information) is transmitted to the master unit on the idle channel and the timer is started.

【００３５】ステップＳ７では、所定時間内に親機から
のａｃｋ（ａｃｋｎｏｗｌｅｄｇｅ：肯定応答）を受信
したか否かを判定する。親機からａｃｋを受信しない場
合には、ステップＳ８において、送信に使用したチャネ
ルを割り当てチャネルから除く。他方、親機からａｃｋ
を受信した場合には、ステップＳ９において、割り当て
チャネルに変更があるか否かを判定する。割り当てチャ
ネルに変更がある場合には、ステップＳ１０において、
割り当てチャネル変更のための処理を行う。In step S7, it is determined whether or not an ack (acknowledge) has been received from the master unit within a predetermined time. If no ack is received from the parent device, the channel used for transmission is excluded from the assigned channels in step S8. On the other hand, ack from the base unit
Is received, it is determined in step S9 whether the assigned channel has been changed. If there is a change in the assigned channel, in step S10,
Performs processing for changing assigned channels.

【００３６】次に、図６〜図８に示すフローチャートを
参照して、親機側の処理手順を説明する。Next, the processing procedure on the master side will be described with reference to the flowcharts shown in FIGS.

【００３７】但し、これらフローチャートにおいては、
前提条件として、子機の数を「Ｍ」とする。また、制御
部で設定する「割り当てチャネル」、「ｃｈ変更要求フ
ラグ」、「ａｃｋ送信フラグ」は、狭帯域送受信機でも
参照可能とする。さらに、狭帯域送受信機で復調された
データと、それがどの割り当てチャネルで検出されたも
のかという情報は、制御部でも参照可能とする。同様
に、広帯域受信機で計算する累積の信号強度は、制御部
でも参照可能とする。However, in these flowcharts,
As a precondition, the number of slave units is “M”. Further, the "assigned channel", "ch change request flag", and "ack transmission flag" set by the control unit can be referred to by the narrow band transceiver. Further, the data demodulated by the narrow band transceiver and the information on which allocation channel it was detected can be referred to by the control unit. Similarly, the cumulative signal strength calculated by the wideband receiver can be referred to by the control unit.

【００３８】図６は、親機の狭帯域送受信機１００（図
４参照）における処理手順を示すフローチャートであ
る。FIG. 6 is a flow chart showing the processing procedure in the narrow band transceiver 100 (see FIG. 4) of the parent device.

【００３９】ステップＳ２１では、割り当てチャネルを
順にキャリアセンスする。そして、信号が検出されるま
でステップＳ２１，Ｓ２２を繰り返す。In step S21, carrier sense is sequentially performed on the assigned channels. Then, steps S21 and S22 are repeated until a signal is detected.

【００４０】ステップＳ２３では、信号を復調して制御
部へ渡たす。In step S23, the signal is demodulated and passed to the control section.

【００４１】ステップＳ２４では、ａｃｋ送信要求フラ
グが「１」であるか否かを判定する。In step S24, it is determined whether or not the ack transmission request flag is "1".

【００４２】ステップＳ２５では、ｃｈ（チャネル）変
更要求フラグが「１」であるか否かを判定する。ｃｈ変
更要求フラグが「１」でない場合には、ステップＳ２６
において、子機へａｃｋを送信する。他方、ｃｈ変更要
求フラグが「１」である場合には、ステップＳ２７にお
いて、子機へａｃｋと割り当てチャネル変更内容を送信
する。In step S25, it is determined whether the ch (channel) change request flag is "1". If the ch change request flag is not "1", step S26
At, ACK is transmitted to the child device. On the other hand, when the ch change request flag is "1", ack and the assigned channel change contents are transmitted to the child device in step S27.

【００４３】図７は、親機の広帯域受信機２００（図４
参照）における処理手順を示すフローチャートである。FIG. 7 shows the broadband receiver 200 (FIG. 4) of the parent device.
3) is a flowchart showing a processing procedure in (see).

【００４４】ステップＳ３１では、チャネル毎の累積の
信号強度をクリアする。In step S31, the accumulated signal strength for each channel is cleared.

【００４５】ステップＳ３２では、全チャネル周波数を
含むベースバンド信号をＡ／Ｄ変換し、周波数変換す
る。In step S32, the baseband signal including all channel frequencies is A / D converted and frequency converted.

【００４６】ステップＳ３３では、パワースペクトルか
ら各チャネル毎に、過去の所定期間の累積の信号強度を
計算し、その計算結果を制御部に報告する。In step S33, the cumulative signal strength in the past predetermined period is calculated for each channel from the power spectrum, and the calculation result is reported to the control unit.

【００４７】図８は、親機の制御部３００（図４参照）
における処理手順を示すフローチャートである。FIG. 8 shows the controller 300 of the master unit (see FIG. 4).
3 is a flowchart showing a processing procedure in FIG.

【００４８】ステップＳ４１では、まず初期の割り当て
チャネルを設定する。In step S41, first, an initial allocation channel is set.

【００４９】ステップＳ４２では、ｃｈ変更要求フラグ
＝０，ａｃｋ送信要求フラグ＝０，ｃｈ変更通知フラグ
（ｉ）＝０とする。ここで、ｉ＝１・・・Ｍである。In step S42, ch change request flag = 0, ack transmission request flag = 0, and ch change notification flag (i) = 0. Here, i = 1 ... M.

【００５０】ステップＳ４３では、復調データがあるか
否かを判定する。In step S43, it is determined whether there is demodulated data.

【００５１】ステップＳ４４では、復調データ解析（Ｉ
Ｄ情報をもとにシステム内の子機からのデータかどうか
識別）を行い、ｃｈ変更要求フラグ＝０，ａｃｋ送信要
求フラグ＝０とする。In step S44, demodulated data analysis (I
Based on the D information, it is determined whether or not the data is from a slave in the system), and ch change request flag = 0 and ack transmission request flag = 0.

【００５２】ステップＳ４５では、子機Ｋからの検知情
報を受信したか否かを判定する（１≦Ｋ≦Ｍ）。In step S45, it is determined whether or not the detection information from the child device K is received (1≤K≤M).

【００５３】ステップＳ４６では、ａｃｋ送信要求フラ
グ＝１とする。In step S46, the ack transmission request flag = 1 is set.

【００５４】ステップＳ４７では、ｃｈ変更通知フラグ
（Ｋ）＝１であるか否かを判定する。In step S47, it is determined whether or not the ch change notification flag (K) = 1.

【００５５】ステップＳ４８では、ｃｈ変更要求フラグ
＝１，ｃｈ変更通知フラグ（Ｋ）＝０とする。In step S48, ch change request flag = 1 and ch change notification flag (K) = 0.

【００５６】他方、ステップＳ４５において否定判定
（ＮＯ）がなされた場合には、妨害波（他システムから
のもの）と判断し、ステップＳ４９において、ｃｈ変更
通知フラグ（ｉ）＝０であるか否かを判定する（ここ
で、ｉ＝１・・・Ｍ）。On the other hand, if a negative determination (NO) is made in step S45, it is determined that the wave is an interfering wave (from another system), and it is determined in step S49 whether the ch change notification flag (i) = 0. It is determined (here, i = 1 ... M).

【００５７】ステップＳ５０では、現割り当てチャネル
以外で、累積信号強度が最小のチャネルを選択して、妨
害波が検出された割り当てチャネルと置き換える。ま
た、ｃｈ変更通知フラグ（ｉ）＝１とする（ｉ＝１・・
・Ｍ）。In step S50, a channel having a minimum cumulative signal strength other than the currently assigned channel is selected and replaced with the assigned channel in which the interference wave is detected. Further, the ch change notification flag (i) = 1 is set (i = 1 ...
・ M).

【００５８】図９は、本実施の形態における通信チャネ
ルの変更動作（すなわち、チャネル切り換え動作）を例
示した説明図である。本図では、６つのチャネルｃｈ１
〜ｃｈ６を３つのシステムＡ，Ｂ，Ｃで共用できるよう
にしてあり、システムＡ（本システム）に対して、シス
テムＢおよびＣは本システム以外の他システムとして動
作する。従って、システムＡ（本システム）の通信チャ
ネル中に、システムＢあるいはシステムＣからの電波が
混入した場合には、システムＡ（本システム）にとって
これらシステムＢ，Ｃからの電波は妨害波となる。FIG. 9 is an explanatory diagram exemplifying a communication channel changing operation (ie, channel switching operation) in the present embodiment. In this figure, six channels ch1
.About.ch6 can be shared by the three systems A, B, and C, and the systems B and C operate as systems other than the present system with respect to the system A (present system). Therefore, when the radio waves from the system B or the system C are mixed in the communication channel of the system A (the present system), the radio waves from the systems B and C become an interfering wave for the system A (the present system).

【００５９】図９に示すように、システムＡ（本システ
ム）においては、割り当てチャネル数を２チャネルと
し、初期状態ではｃｈ１，ｃｈ４を通信チャネルとして
割り当てる。このときの通信状態をより具体的に例示し
たのが図１０である。As shown in FIG. 9, in system A (this system), the number of allocated channels is two, and ch1 and ch4 are allocated as communication channels in the initial state. FIG. 10 more specifically illustrates the communication state at this time.

【００６０】図１０は、図９に示した本システムＡの通
信過程中に妨害波の侵入を受けて通信チャネルの割り当
てを変更し、且つ、その割り当て変更を子機に通知する
手順を示している。すなわち、（ａ）システムＣからの電波Ｃ１（妨害１）を検知し
て、通信チャネルをｃｈ４からｃｈ５に変更した場合：（ｂ）システムＢからの電波Ｂ２（妨害２）を検知し
て、通信チャネルをｃｈ１からｃｈ３に変更した場合：
が生じた場合の通信手順について詳しく示してある。そ
の内容は、図１０より明らかであるので、詳細な説明は
省略する。FIG. 10 shows a procedure for changing the communication channel allocation due to the intrusion of an interfering wave during the communication process of the system A shown in FIG. 9 and notifying the slave unit of the change of the allocation. There is. That is, (a) when the radio wave C1 (interference 1) from the system C is detected and the communication channel is changed from ch4 to ch5: (b) the radio wave B2 (interference 2) from the system B is detected and communication is performed. When changing the channel from ch1 to ch3:
The details of the communication procedure in the case of occurrence of are described. Since the content is clear from FIG. 10, detailed description will be omitted.

【００６１】[0061]

【発明の効果】以上説明した通り、本発明によれば、短
時間で通信チャネルが確定でき、低消費電力であって、
且つ、信頼性の高い無線通信システムおよび無線通信方
法を実現することができる。As described above, according to the present invention, the communication channel can be established in a short time, and the power consumption is low.
Moreover, a highly reliable wireless communication system and wireless communication method can be realized.

【００６２】換言すると、本発明によれば、無定位循環
方式において通信チャネル数を抑え、妨害波の検出結果
をもとに通信チャネルを切り換えることにより、他シス
テムとのチャネル競合や妨害波の影響が少ない低消費電
力で、信頼の高い無線通信システムおよび無線通信方法
を実現することが可能となる。In other words, according to the present invention, the number of communication channels is suppressed and the communication channels are switched based on the detection result of the interfering wave in the atypical circulation system, so that the channel competition with other systems and the influence of the interfering wave are caused. It is possible to realize a highly reliable wireless communication system and wireless communication method with low power consumption and low power consumption.

[Brief description of drawings]

【図１】本発明を適用した無線通信システムの動作原理
を模式的に示した説明図である。FIG. 1 is an explanatory diagram schematically showing the operating principle of a wireless communication system to which the present invention is applied.

【図２】子機と親機の通信タイミングを例示した説明図
である。FIG. 2 is an explanatory diagram exemplifying communication timing between a child device and a parent device.

【図３】図１に示した子機の詳細な構成を示すブロック
図である。FIG. 3 is a block diagram showing a detailed configuration of a slave unit shown in FIG.

【図４】図１に示した親機の詳細な構成を示すブロック
図である。FIG. 4 is a block diagram showing a detailed configuration of a master unit shown in FIG.

【図５】子機側の処理手順を示すフローチャートであ
る。FIG. 5 is a flowchart showing a processing procedure on the slave side.

【図６】親機の狭帯域送受信機１００における処理手順
を示すフローチャートである。FIG. 6 is a flowchart showing a processing procedure in the narrowband transceiver 100 of the parent device.

【図７】親機の広帯域受信機２００における処理手順を
示すフローチャートである。FIG. 7 is a flowchart showing a processing procedure in the broadband receiver 200 of the parent device.

【図８】親機の制御部３００における処理手順を示すフ
ローチャートである。FIG. 8 is a flowchart showing a processing procedure in the control unit 300 of the parent device.

【図９】本実施の形態における通信チャネルの変更動
作、すなわちチャネル切り換え動作、を例示した説明図
である。FIG. 9 is an explanatory diagram exemplifying a communication channel changing operation according to the present embodiment, that is, a channel switching operation.

【図１０】図９に示した本システムＡの通信過程中に妨
害波の侵入を受けて通信チャネルの割り当てを変更し、
且つ、その割り当て変更を子機に通知する手順を示す図
である。10 changes the communication channel assignment due to the intrusion of an interfering wave during the communication process of the system A shown in FIG.
And, it is a diagram showing a procedure of notifying the slave unit of the allocation change.

[Explanation of symbols]

２子機アンテナ４アンテナスイッチ６無線受信部８復調部１０受信レベル検出部１２子機の内部もしくは外部に設置されたセンサ部１４送受信制御部１６変調部１８無線送信部２０局部発振部３０狭帯域送受信アンテナ３２アンテナスイッチ３４無線受信部３６復調部３８受信レベル検出部４０送受信制御部４２変調部４４無線送信部４６局部発振部５０広帯域受信アンテナ５２無線受信部５４周波数解析部５６演算部１００狭帯域送受信機２００広帯域受信機３００制御部 2 slave antenna 4 antenna switch 6 Radio receiver 8 Demodulator 10 Reception level detector 12 Sensor unit installed inside or outside the cordless handset 14 Transmission / reception control unit 16 Modulator 18 Wireless transmitter 20 Local oscillator 30 Narrow band transceiver antenna 32 antenna switch 34 Radio receiver 36 Demodulator 38 Reception level detector 40 Transmission / reception control unit 42 Modulator 44 Wireless transmitter 46 local oscillator 50 Wideband receiving antenna 52 wireless receiver 54 Frequency analysis unit 56 Operation unit 100 narrow band transceiver 200 wideband receiver 300 control unit

フロントページの続き (56)参考文献特開平10−248080（ＪＰ，Ａ) 特開平２−43829（ＪＰ，Ａ) 特開昭63−26128（ＪＰ，Ａ) 特開平６−291723（ＪＰ，Ａ) 特開平11−69414（ＪＰ，Ａ) 特開昭63−222525（ＪＰ，Ａ) 国際公開00／032003（ＷＯ，Ａ１) (58)調査した分野(Int.Cl.⁷，ＤＢ名) H04B 7/24 - 7/26 H04Q 7/00 - 7/38 Continuation of the front page (56) Reference JP-A-10-248080 (JP, A) JP-A-2-43829 (JP, A) JP-A-63-26128 (JP, A) JP-A-6-291723 (JP , A) JP-A-11-69414 (JP, A) JP-A-63-222525 (JP, A) International publication 00/032003 (WO, A1) (58) Fields investigated (Int.Cl. ⁷ , DB name) ) H04B 7/24-7/26 H04Q 7/00-7/38

Claims

(57) [Claims]

1. A wireless communication system for performing communication between a master unit and a plurality of slave units by sharing a plurality of narrow band wireless channels, wherein the slave unit is selected from all available channels. Of a plurality of pre-allocated channels for communication, a narrow band transmission means for transmitting the detection information output from a predetermined detection means to the parent device via a specific free channel, and via the specific free channel. And narrowband receiving means for receiving channel control information transmitted from the master unit, wherein the master unit sequentially scans the plurality of communication channels to receive signals transmitted from the slave unit. Narrow band receiving means, wide band receiving means for monitoring the radio wave usage status of all the available channels, and allocation of the communication channel based on the radio wave usage status monitored by the wide band receiving means. And a control means for performing hit change, and a narrow-band transmission means for notifying the assignment change of the communication channel to the handset as the channel control information, the control means of the base unit, the broadband within a predetermined time period Receiving
When the signal strength output from the receiving means is added to each of the available channels, the total value is larger than a preset threshold value,
Moreover, when the master unit and the slave unit are not using the channel during the period, it is determined that an interference wave exists in the channel.

2. A plurality of narrow bands are provided between a master unit and a plurality of slave units.
A wireless communication system for performing communications by sharing a frequency radio channel, said child machine, a plurality of pre-assigned from all available channels
Narrowband transmission means for transmitting the detection information output from the predetermined detection means to the parent device via a specific idle channel among the communication channels of the above, and the parent device via the specific idle channel. Sent
Narrowband receiving means for receiving incoming channel control information , wherein the master unit sequentially scans the plurality of communication channels and the slave unit.
Narrow band receiving means for receiving the signal transmitted from, and a wide band for monitoring the radio wave usage status of all the available channels.
Based on the band receiving means and the radio wave usage status monitored by the wide band receiving means.
And a control means for changing the allocation of the communication channels, and the channel control for changing the allocation of the communication channels.
A narrowband transmission means for notifying the slave unit as information , wherein the wideband receiving means of the master unit converts a wideband received signal including the usable channel into a digital signal and periodically Fourier transforms it, The signal strength of each channel is obtained from the power spectrum, and these are supplied to the control means as the information indicating the radio wave use status, and the control means outputs from the broadband receiving means within a predetermined period.
Wherein the output signal strength, when the sum for each channel of all possible for the used channel, even if the total value is larger than a preset threshold, and, with the master unit A wireless communication system, characterized in that when a slave unit is not using the channel during the period, it is determined that an interference wave exists in the channel.

3. The wireless communication system according to claim 1 , wherein the communication channels in the initial state are allocated such that the communication channels are separated from each other by a predetermined number of channel intervals or more, and the control means , When there is an interfering wave in the current communication channel, if a channel that is separated from the current communication channel by a predetermined number of channels or more and has no interfering wave is found, the signal strength in the channel without the interfering wave A wireless communication system characterized in that the channel having the smallest cumulative value of is replaced with a communication channel in which an interference wave exists and is assigned as a new communication channel.

4. A plurality of narrow bands are provided between a master unit and a plurality of slave units.
A wireless communication system for performing communications by sharing a frequency radio channel, said child machine, a plurality of pre-assigned from all available channels
Narrowband transmission means for transmitting the detection information output from the predetermined detection means to the parent device via a specific idle channel among the communication channels of the above, and the parent device via the specific idle channel. Sent
Narrowband receiving means for receiving incoming channel control information , wherein the master unit sequentially scans the plurality of communication channels and the slave unit.
Narrow band receiving means for receiving the signal transmitted from, and a wide band for monitoring the radio wave usage status of all the available channels.
Based on the band receiving means and the radio wave usage status monitored by the wide band receiving means.
And a control means for changing the allocation of the communication channels, and the channel control for changing the allocation of the communication channels.
Narrowband transmission means for notifying the slave unit as information, wherein the slave unit has all the allocated plurality of communication channels.
If the channel cannot be used due to an interfering wave , the channels are switched in a predetermined order, data of the length determined for each channel is sent to the master unit to notify the abnormal state, and the master unit receives the broadband reception. Using the means of the slave
A wireless communication system characterized by detecting an abnormal state .

5. A plurality of narrow bands are provided between a master unit and a plurality of slave units.
A wireless communication system for performing communications by sharing a frequency radio channel, said child machine, a plurality of pre-assigned from all available channels
Narrowband transmission means for transmitting the detection information output from the predetermined detection means to the parent device via a specific idle channel among the communication channels of the above, and the parent device via the specific idle channel. Sent
Narrowband receiving means for receiving incoming channel control information , wherein the master unit sequentially scans the plurality of communication channels and the slave unit.
Narrow band receiving means for receiving the signal transmitted from, and a wide band for monitoring the radio wave usage status of all the available channels.
Based on the band receiving means and the radio wave usage status monitored by the wide band receiving means.
And a control means for changing the allocation of the communication channels, and the channel control for changing the allocation of the communication channels.
Narrowband transmission means for notifying the child device as information, and the wideband reception means of the parent device is provided with the usable channel.
Periodically Fourier transform converts the wideband received signal containing a channel into digital signals, obtains the signal strength for each channel from the power spectrum, is supplied to the control means of these as the information indicating the radio wave use conditions , The slave has all the allocated communication channels.
If the channel cannot be used due to an interfering wave , the channels are switched in a predetermined order, data of the length determined for each channel is sent to the master unit to notify the abnormal state, and the master unit receives the broadband reception. Using the means of the slave
A wireless communication system characterized by detecting an abnormal state .

6. A plurality of narrow bands are provided between a master unit and a plurality of slave units.
Wireless communication method der to perform communication by sharing a frequency radio channel
Therefore, the slave unit is a plurality of pre-allocated channels among all available channels.
Narrowband transmission means for transmitting the detection information output from the predetermined detection means to the parent device via a specific idle channel among the communication channels of the above, and the parent device via the specific idle channel. Sent
Narrowband receiving means for receiving incoming channel control information , wherein the master unit sequentially scans the plurality of communication channels and the slave unit.
Narrow band receiving means for receiving the signal transmitted from, and a wide band for monitoring the radio wave usage status of all the available channels.
Based on the band receiving means and the radio wave usage status monitored by the wide band receiving means.
And a control means for changing the allocation of the communication channels, and the channel control for changing the allocation of the communication channels.
Narrowband transmission means for notifying the slave device as information, and the control means of the master device receives the broadband signal within a predetermined period.
When the signal strength output from the receiving means is added to each of the available channels, the total value is larger than a preset threshold value,
Moreover, when the master unit and the slave unit are not using the channel during the period, it is determined that an interfering wave exists in the channel.

7. A plurality of narrow bands are provided between a master unit and a plurality of slave units.
A wireless communication method for performing communications by sharing a frequency radio channel, said child machine, a plurality of pre-assigned from all available channels
Narrowband transmission means for transmitting the detection information output from the predetermined detection means to the parent device via a specific idle channel among the communication channels of the above, and the parent device via the specific idle channel. Sent
Narrowband receiving means for receiving incoming channel control information , wherein the master unit sequentially scans the plurality of communication channels and the slave unit.
Narrow band receiving means for receiving the signal transmitted from, and a wide band for monitoring the radio wave usage status of all the available channels.
Based on the band receiving means and the radio wave usage status monitored by the wide band receiving means.
And a control means for changing the allocation of the communication channels, and the channel control for changing the allocation of the communication channels.
Narrowband transmission means for notifying the child device as information, and the wideband reception means of the parent device is provided with the usable channel.
Periodically Fourier transform converts the wideband received signal containing a channel into digital signals, obtains the signal strength for each channel from the power spectrum, is supplied to the control means of these as the information indicating the radio wave use conditions , The control means from the broadband receiving means within a predetermined period
Wherein the output signal strength, when the sum for each channel of all possible for the used channel, even if the total value is larger than a preset threshold, and, with the master unit A wireless communication method, characterized in that when a slave unit is not using that channel during that period, it is determined that an interference wave exists in that channel.

8. The wireless communication method according to claim 6 or 7.
For the communication channel in the initial state,
The channels are allocated so that they are separated by a predetermined number of channels or more, and the control means is configured so that an interfering wave exists in the current communication channel.
To time, away from the current communications channel over a predetermined number of channel spacing, and if the interference wave is found a channel that does not exist, the smallest channel cumulative value of the signal intensity in the channel there is no disturbance, disturbance A wireless communication method characterized by allocating as a new communication channel instead of a communication channel in which a wave exists.

9. A plurality of narrow bands are provided between a master unit and a plurality of slave units.
A wireless communication method for performing communications by sharing a frequency radio channel, said child machine, a plurality of pre-assigned from all available channels
Narrowband transmission means for transmitting the detection information output from the predetermined detection means to the parent device via a specific idle channel among the communication channels of the above, and the parent device via the specific idle channel. Sent
Narrowband receiving means for receiving incoming channel control information , wherein the master unit sequentially scans the plurality of communication channels and the slave unit.
Narrow band receiving means for receiving the signal transmitted from, and a wide band for monitoring the radio wave usage status of all the available channels.
Based on the band receiving means and the radio wave usage status monitored by the wide band receiving means.
And a control means for changing the allocation of the communication channels, and the channel control for changing the allocation of the communication channels.
Narrowband transmission means for notifying the slave unit as information, wherein the slave unit has all the allocated plurality of communication channels.
If the channel cannot be used due to an interfering wave , the channels are switched in a predetermined order, data of the length determined for each channel is sent to the master unit to notify the abnormal state, and the master unit receives the broadband reception. Using the means of the slave
A wireless communication method characterized by detecting an abnormal state .

10. A plurality of narrow units are provided between a master unit and a plurality of slave units.
A wireless communication method for performing communication by sharing a band wireless channel , wherein the slave unit is a plurality of pre-allocated channels from all available channels.
Narrowband transmission means for transmitting the detection information output from the predetermined detection means to the parent device via a specific idle channel among the communication channels of the above, and the parent device via the specific idle channel. Sent
Narrowband receiving means for receiving incoming channel control information , wherein the master unit sequentially scans the plurality of communication channels and the slave unit.
Narrow band receiving means for receiving the signal transmitted from, and a wide band for monitoring the radio wave usage status of all the available channels.
Based on the band receiving means and the radio wave usage status monitored by the wide band receiving means.
And a control means for changing the allocation of the communication channels, and the channel control for changing the allocation of the communication channels.
Narrowband transmission means for notifying the child device as information, and the wideband reception means of the parent device is provided with the usable channel.
Periodically Fourier transform converts the wideband received signal containing a channel into digital signals, obtains the signal strength for each channel from the power spectrum, is supplied to the control means of these as the information indicating the radio wave use conditions , The slave has all the allocated communication channels.
If the channel cannot be used due to an interfering wave , the channels are switched in a predetermined order, data of the length determined for each channel is sent to the master unit to notify the abnormal state, and the master unit receives the broadband reception. Using the means of the slave
A wireless communication method characterized by detecting an abnormal state .