JP2008177790A - Radio transmission system - Google Patents

Radio transmission system Download PDF

Info

Publication number
JP2008177790A
JP2008177790A JP2007008547A JP2007008547A JP2008177790A JP 2008177790 A JP2008177790 A JP 2008177790A JP 2007008547 A JP2007008547 A JP 2007008547A JP 2007008547 A JP2007008547 A JP 2007008547A JP 2008177790 A JP2008177790 A JP 2008177790A
Authority
JP
Japan
Prior art keywords
radio
reception
transmission
bit pattern
radio signal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2007008547A
Other languages
Japanese (ja)
Other versions
JP4830865B2 (en
Inventor
Masanori Kurita
昌典 栗田
Takashi Saeki
隆 佐伯
Junichi Suzuki
淳一 鈴木
Koji Sakamoto
浩司 阪本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP2007008547A priority Critical patent/JP4830865B2/en
Publication of JP2008177790A publication Critical patent/JP2008177790A/en
Application granted granted Critical
Publication of JP4830865B2 publication Critical patent/JP4830865B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Landscapes

  • Mobile Radio Communication Systems (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To shorten a delay time of information transmission while reducing the power consumption of a radio device. <P>SOLUTION: Even if the reception of a radio signal is failed since frame synchronization is not successful within a predetermined time, or owing to the occurrence of a transmission error, a control unit 1 checks a radio wave again when a bit pattern BP for discrimination is detected, or stops a radio transmission/reception unit 2 and restarts counting an intermittent reception interval when the bit pattern BP for discrimination is not detected even once. Thus, even if the reception of the radio signal is failed, the receiving operation is carried on without stopping the radio transmission/reception unit 2 when the bit pattern BP for discrimination inserted into the radio signal is detected, so that, while the power consumption of a radio device TR is reduced through intermittent reception, a time up to a time when the radio signal can be received normally, i.e. a delay time of the information transmission can be made shorter than that when the radio transmission/reception unit 2 is stopped until an intermittent reception interval passes again. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、複数の無線機の間で無線信号を伝送する無線伝送システムに関するものである。   The present invention relates to a wireless transmission system for transmitting a wireless signal between a plurality of wireless devices.

我が国で使用する無線機については、占有周波数帯幅や隣接チャンネル漏洩電力などの使用電波の特性（ＲＦ特性）が電波法の規定を満たしていなくてはならない。また、電波法では使用目的ごとに異なる規格（通信規格）が規定されている。例えば、電波法施行規則第６条に規定される「特定小電力無線局」には、電波を利用して遠隔地点における測定機の測定結果を自動的に表示し、又は記録するためのテレメータ用、電波を利用して遠隔地点における装置の機能を始動、変更又は終止させることを目的とする信号の伝送を行うテレコントロール用、及び主として機械によって処理される情報の伝送又は処理された情報の伝送を行うデータ伝送用無線設備について規定された「特定小電力無線局テレメータ用、テレコントロール用及びデータ伝送用無線設備 標準規格（社団法人電波産業会 標準規格ＡＲＩＢ ＳＴＤ−Ｔ６７）」、あるいは、主として火災、盗難その他異常の通報又はこれに付随する制御を行う小電力セキュリティシステムの無線設備について規定された「小電力セキュリティシステムの無線局の無線設備 標準規格（社団法人電波産業会 標準規格ＲＣＲ ＳＴＤ−３０）」などがある。   For radio equipment used in Japan, the characteristics of radio waves used (RF characteristics) such as occupied frequency bandwidth and adjacent channel leakage power must satisfy the regulations of the Radio Law. In the Radio Law, different standards (communication standards) are defined for each purpose of use. For example, the “specified low-power radio station” defined in Article 6 of the Radio Law Enforcement Regulations uses a telemeter for automatically displaying or recording the measurement results of remote measuring devices using radio waves. , For telecontrol that transmits signals for the purpose of starting, changing or terminating the function of a device at a remote point using radio waves, and transmission of information processed mainly by machines or transmission of processed information "Specified low-power radio station telemeter, telecontrol and data transmission radio equipment standard (Radio Industry Association Standard ARIB STD-T67)" or mainly fire "Small power," which is defined for the wireless facilities of the low power security system that reports theft or other abnormalities or controls associated therewith Curie tee system of the radio station radio equipment standards (Association of Radio Industries and Businesses Standard RCR STD-30) ", and the like.

一方、上記特定小電力無線局を備えた無線伝送システムとしては、例えば、特許文献１に記載されているような火災報知システムがある。かかる火災報知システムは、多箇所に設置された複数台の火災感知器（無線機）がそれぞれに火災を感知する機能と警報音を鳴動する機能を有しており、何れかの火災感知器が火災を感知すると、当該火災感知器が警報音を鳴動するとともに火災感知を知らせる情報（火災感知情報）を無線信号で他の火災感知器に伝送することにより、火元の火災感知器だけでなく複数台の火災感知器が連動して一斉に警報音を鳴動することにより、火災の発生を迅速且つ確実に知らせることができる。   On the other hand, as a radio transmission system provided with the specific low-power radio station, there is a fire alarm system described in Patent Document 1, for example. Such a fire alarm system has a function in which a plurality of fire detectors (radio units) installed in many places sense a fire and sound a warning sound. When a fire is detected, the fire detector sounds an alarm sound and transmits information (fire detection information) to notify the fire detection to other fire detectors by wireless signals, so that not only the fire source fire detector. A plurality of fire detectors interlock and sound an alarm sound all at once, so that the occurrence of a fire can be notified quickly and reliably.

このような火災感知器（無線機）は、火災感知情報を無線信号で伝送するという特性を活かすために電池を電源として駆動され、しかも、通常は室内の天井のようにメンテナンス（電池交換）のし難い場所に設置されることから、例えば数年といった長期間にわたってメンテナンス無しに使用できることが望ましい。そのため、各火災感知器においては間欠的に受信回路を起動して所望の電波（他の火災感知器が送信した無線信号）が受信できるか否かをチェックし、当該電波が捉えられなければ直ちに受信回路を停止して待機状態に移行することで平均消費電力を大幅に低減することが望まれる。
特開２００６−３４３９８３号公報 Such a fire detector (wireless device) is driven by a battery in order to take advantage of the characteristic of transmitting fire detection information with a radio signal, and is usually used for maintenance (battery replacement) like an indoor ceiling. Since it is installed in a difficult place, it is desirable that it can be used without maintenance for a long period of time such as several years. Therefore, each fire detector intermittently activates a receiving circuit to check whether or not a desired radio wave (a radio signal transmitted by another fire sensor) can be received. It is desired to significantly reduce the average power consumption by stopping the receiving circuit and shifting to the standby state.
JP 2006-343983 A

ところで、上述の特定小電力無線局の規格においては無線局（無線機）から連続して電波を送信することができる期間（送信期間）および電波を送信してはいけない期間（休止期間）について規定されており、間欠受信のタイミングと送信期間とが一致しなければ無線信号を受信することができない。また送信期間には、同期ビット、フレーム同期パターン、メッセージ、ＣＲＣ符号を少なくとも含むデータフォーマットを１フレームとする無線信号が数フレーム分、連続して送信されるのであるが、例えば、フレーム同期パターンに同期できても、メッセージエラーやＣＲＣエラーになると、休止期間に移行する仕様となっていた。そして、このように受信エラーとなった場合には再度一定時間（間欠受信間隔）が経過しないと電波チェックが行われず、無線信号を受信するタイミングが遅延してしまうことになる。   By the way, in the above-mentioned standard for the specific low-power radio station, the period (transmission period) during which radio waves can be continuously transmitted from the radio station (radio unit) and the period during which radio waves should not be transmitted (pause period) Therefore, a wireless signal cannot be received unless the timing of intermittent reception matches the transmission period. In addition, during the transmission period, a radio signal having a data format including at least a synchronization bit, a frame synchronization pattern, a message, and a CRC code as one frame is continuously transmitted for several frames. Even if the synchronization is possible, the specification shifts to a suspension period when a message error or CRC error occurs. If a reception error occurs in this way, the radio wave check is not performed unless a certain time (intermittent reception interval) has passed again, and the timing for receiving a radio signal is delayed.

本発明は上記事情に鑑みて為されたものであり、その目的は、無線機の消費電力を低減しつつ情報伝送の遅延時間を短縮することができる無線伝送システムを提供することにある。   The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wireless transmission system capable of reducing the delay time of information transmission while reducing the power consumption of the wireless device.

請求項１の発明は、上記目的を達成するために、 複数の無線機を備え、これら複数の無線機の間で無線信号を伝送する無線伝送システムであって、各無線機は、無線信号を送信する送信手段若しくは無線信号を受信する受信手段の少なくとも何れか一方と、電源供給用の電池とを共通に具備し、送信手段を具備する無線機は、無線信号の１フレーム内に所定の識別用ビットパターンを挿入する識別用ビットパターン挿入手段と、所定のイベントが発生したときに送信手段を起動し、所定の送信期間に無線信号を送信させるとともに所定の休止期間に無線信号の送信を休止させる動作を交互に繰り返し且つ前記イベントが発生していないときには送信手段を停止させる送信制御手段とを具備し、受信手段を具備する無線機は、受信手段で受信する無線信号の識別用ビットパターンを検出する識別用ビットパターン検出手段と、一定の間欠受信間隔を繰り返しカウントするタイマ手段と、タイマ手段による間欠受信間隔のカウント中は受信手段を停止させ、タイマ手段による間欠受信間隔のカウントが完了する度に受信手段を起動する受信制御手段とを具備し、受信制御手段は、受信手段にて所望の電波が捉えられたら無線信号を受信し、所望の電波が捉えられなければ受信手段を停止させ、さらに無線信号の受信に失敗しても識別用ビットパターン検出手段が識別用ビットパターンを検出すれば受信手段を停止させずに引き続き受信動作を継続することを特徴とする。   In order to achieve the above object, the invention of claim 1 is a wireless transmission system including a plurality of wireless devices and transmitting wireless signals between the plurality of wireless devices, wherein each wireless device transmits a wireless signal. At least one of transmitting means for transmitting or receiving means for receiving a radio signal and a battery for supplying power are commonly provided, and the radio having the transmitting means has a predetermined identification within one frame of the radio signal. An identification bit pattern insertion unit that inserts a bit pattern, and a transmission unit that is activated when a predetermined event occurs to transmit a radio signal during a predetermined transmission period and stop transmission of a radio signal during a predetermined pause period And the transmission control means for stopping the transmission means when the event does not occur, and the radio having the reception means receives the signal at the reception means. An identification bit pattern detection means for detecting an identification bit pattern of a radio signal, a timer means for repeatedly counting a constant intermittent reception interval, a reception means being stopped during counting of the intermittent reception interval by the timer means, and a timer means Receiving control means for activating the receiving means each time counting of the intermittent reception interval is completed. The reception control means receives a radio signal when the receiving means catches a desired radio wave, If it is not captured, the receiving means is stopped, and even if reception of the radio signal fails, if the identifying bit pattern detecting means detects the identifying bit pattern, the receiving operation is continued without stopping the receiving means. Features.

請求項２の発明は、請求項１の発明において、識別用ビットパターン挿入手段は、１フレーム内に複数の識別用ビットパターンを挿入することを特徴とする。   According to a second aspect of the present invention, in the first aspect of the invention, the identification bit pattern inserting means inserts a plurality of identification bit patterns in one frame.

請求項３の発明は、請求項２の発明において、識別用ビットパターン挿入手段は、複数の識別用ビットパターンを略定期的に挿入することを特徴とする。   According to a third aspect of the present invention, in the second aspect of the present invention, the identification bit pattern insertion means inserts a plurality of identification bit patterns substantially regularly.

請求項１の発明によれば、例え無線信号の受信に失敗しても無線信号の１フレーム内に挿入されている識別用ビットパターンを検出していれば受信手段を停止せずに引き続き受信動作を継続するので、無線機の消費電力を低減しつつ無線信号を正常に受信できるまでの時間、すなわち、情報伝送の遅延時間を短縮することができる。   According to the first aspect of the present invention, even if reception of the radio signal fails, if the bit pattern for identification inserted in one frame of the radio signal is detected, the receiving operation is continued without stopping the receiving means. Therefore, it is possible to shorten the time until the wireless signal can be normally received, that is, the delay time of information transmission, while reducing the power consumption of the wireless device.

請求項２の発明によれば、１フレーム内に複数の識別用ビットパターンを挿入するので、ノイズの影響で識別用ビットパターンが検出できなくなる率を減らすことができる。   According to the second aspect of the present invention, since a plurality of identification bit patterns are inserted in one frame, the rate at which the identification bit pattern cannot be detected due to the influence of noise can be reduced.

請求項３の発明によれば、複数の識別用ビットパターンを略定期的に挿入するので、ランダムに発生するノイズの影響で識別用ビットパターンが検出できなくなる率を減らすことができる。   According to the invention of claim 3, since a plurality of identification bit patterns are inserted almost regularly, the rate at which the identification bit patterns cannot be detected due to the influence of randomly generated noise can be reduced.

以下、図面を参照して本発明の実施形態を詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

図１は本実施形態のシステム構成図であり、複数台（図示は２台のみ）の無線機ＴＲで無線伝送システムが構成されている。なお、以下の説明では、無線機ＴＲを個別に示す場合は無線機ＴＲ１，ＴＲ２，…，ＴＲｎと表記し、総括して示す場合は無線機ＴＲと表記する。   FIG. 1 is a system configuration diagram of this embodiment, and a radio transmission system is configured by a plurality of radio units TR (only two units are illustrated). In the following description, when the radio units TR are individually indicated, they are indicated as radio units TR1, TR2,..., TRn, and when collectively indicated, they are indicated as radio units TR.

無線機ＴＲは、アンテナ３から電波を媒体とした無線信号を送信するとともに他の無線機ＴＲが送信した無線信号をアンテナ３で受信する無線送受信部２と、マイコンを主構成要素としイベント発生部４からイベントの発生が通知されたときに他の無線機ＴＲに対してイベント発生を通知するため通知メッセージを含む無線信号を無線送受信部２より送信させる制御部１と、イベントが発生したときにイベントの発生を制御部１に通知するイベント発生部４と、イベント発生部４から制御部１に対してイベントの発生が通知されたことを報知する報知部５と、乾電池等の電池を電源として各部に動作電源を供給する電池電源部６とを具備している。なお、各無線機ＴＲ１，ＴＲ２，…には固有の識別符号が割り当てられており、当該識別符号によって無線信号の宛先並びに送信元の無線機ＴＲ１，ＴＲ２，…が特定できる。   The radio TR transmits a radio signal using radio waves as a medium from the antenna 3 and receives a radio signal transmitted from another radio TR by the antenna 3, and an event generator having a microcomputer as a main component. When the occurrence of an event is notified from 4, the control unit 1 for transmitting a radio signal including a notification message from the radio transmission / reception unit 2 in order to notify the other radio unit TR of the occurrence of the event, and when the event occurs An event generation unit 4 for notifying the occurrence of an event to the control unit 1, a notification unit 5 for notifying that the event generation unit 4 has notified the occurrence of the event to the control unit 1, and a battery such as a dry battery as a power source And a battery power supply unit 6 for supplying operating power to each unit. Each wireless device TR1, TR2,... Is assigned a unique identification code, and the destination of the wireless signal and the transmitting wireless devices TR1, TR2,.

無線送受信部２は、電波法施行規則第６条に規定される「特定小電力無線局」に準拠して電波を媒体とする無線信号を送受信するものである。またイベント発生部４は、例えば、火災に伴って発生する煙や熱、炎などを検出することで火災を感知する火災感知手段や、人体から放射される熱線（赤外線）を検出することで不審者の侵入のようなセキュリティに関する異常を検知するセキュリティ異常検知手段、押釦スイッチ等の操作入力を受け付ける操作入力受付手段などを有している。但し、火災感知手段、セキュリティ異常検知手段、操作入力受付手段の各手段については、従来周知であるから詳細な説明は省略する。   The radio transmission / reception unit 2 transmits / receives a radio signal using radio waves as a medium in accordance with “specific low-power radio stations” defined in Article 6 of the Radio Law Enforcement Regulations. Further, the event generation unit 4 detects suspiciously by detecting fire detection means for detecting a fire by detecting smoke, heat, flame, etc. generated by a fire or detecting a heat ray (infrared ray) emitted from a human body. Security anomaly detecting means for detecting an anomaly related to security such as an intruder, an operation input accepting means for accepting an operation input such as a push button switch. However, the fire detection means, the security abnormality detection means, and the operation input reception means are well known in the art and will not be described in detail.

制御部１は、メモリに格納されたプログラムをマイコンで実行することによって後述する各種の機能を実現している。例えば、イベント発生部４が火災感知手段を有している場合、イベント発生部４から火災発生を感知したことが通知されると、制御部１は報知部５が備えるブザーを駆動して報知音（警報音）を鳴動させることで火災発生を報知するとともに、他の無線機（火災感知器）ＴＲにおいても火災発生の報知音を鳴動させるために火災発生を通知するための通知メッセージを含む無線信号を無線送受信部２より送信させる。また、他の無線機ＴＲから送信された無線信号（火災発生を通知するための通知メッセージを含む無線信号）を無線送受信部２で受信したときも、制御部１は報知部５が備えるブザーを駆動して報知音（警報音）を鳴動させる。つまり、制御部１ではイベント発生部４から火災感知や人体検知、操作入力受付等のイベント発生が通知されたときに報知部５から報知音を鳴動させて報知するとともにイベント発生を通知するための通知メッセージを含む無線信号を無線送受信部２より送信させる機能を有している。   The control unit 1 realizes various functions to be described later by executing a program stored in the memory with a microcomputer. For example, when the event generation unit 4 has a fire detection means, when the event generation unit 4 notifies that the fire has been detected, the control unit 1 drives a buzzer included in the notification unit 5 to generate a notification sound. A radio that includes a notification message for notifying the occurrence of a fire in order to sound a notification of the occurrence of a fire in other radio units (fire detectors) TR as well as notifying the occurrence of a fire by sounding an (alarm sound) The signal is transmitted from the wireless transmission / reception unit 2. In addition, when the wireless transmission / reception unit 2 receives a wireless signal transmitted from another wireless device TR (a wireless signal including a notification message for notifying the occurrence of a fire), the control unit 1 uses a buzzer included in the notification unit 5. Drive to sound an alarm sound. That is, in the control unit 1, when the event generation unit 4 is notified of the occurrence of an event such as fire detection, human body detection, operation input reception, etc., the notification unit 5 generates a notification sound and notifies the occurrence of the event. The wireless transmission / reception unit 2 has a function of transmitting a wireless signal including a notification message.

ここで、従来技術で説明したように「特定小電力無線局テレメータ用、テレコントロール用及びデータ伝送用無線設備 標準規格（社団法人電波産業会 標準規格ＡＲＩＢ ＳＴＤ−Ｔ６７）」や、「小電力セキュリティシステムの無線局の無線設備 標準規格（社団法人電波産業会 標準規格ＲＣＲ ＳＴＤ−３０）」などでは、無線信号を連続して送信してもよい期間（送信期間）と、送信期間と送信期間の間に設けられた、無線信号を送信してはいけない期間（休止期間）とが定められている。例えば、標準規格ＡＲＩＢ ＳＴＤ−Ｔ６７では送信期間が４０秒以下且つ休止期間が２秒以上と規定され、標準規格ＲＣＲ ＳＴＤ−３０では送信期間が３秒以下且つ休止期間が２秒以上と規定されており、制御部１では、これらの規格に適合する送信期間並びに休止期間で無線信号を送信させている。   Here, as described in the related art, “Standard Equipment for Specific Low Power Radio Station Telemeter, Telecontrol and Data Transmission (Radio Industry Association Standard ARIB STD-T67)” and “Low Power Security” In the radio equipment standard of the system radio station (Radio Industry Association Standard RCR STD-30) etc., the period during which radio signals may be transmitted continuously (transmission period), the transmission period and the transmission period A period (pause period) between which radio signals should not be transmitted is defined. For example, the standard ARIB STD-T67 specifies a transmission period of 40 seconds or less and a pause period of 2 seconds or more, and the standard RCR STD-30 specifies a transmission period of 3 seconds or less and a pause period of 2 seconds or more. In addition, the control unit 1 transmits radio signals in a transmission period and a pause period that conform to these standards.

また電池電源部６の電池寿命をできるだけ長くするため、制御部１ではマイコンに内蔵するタイマ（タイマ手段）で所定の時間間隔（間欠受信間隔）を繰り返しカウントするとともに間欠受信間隔のカウントが完了する毎に無線送受信部２を起動して所望の電波（他の無線機ＴＲが送信した無線信号）が受信できるか否かをチェックし、当該電波が捉えられなければ直ちに無線送受信部２を停止して待機状態に移行させることで平均消費電力を大幅に低減している。なお、電波の受信チェックは、無線送受信部２から出力される、受信信号強度の大小に比例した直流電圧信号である受信信号強度表示信号（Receiving Signal Strength Indication：ＲＳＳＩ信号）に基づいて制御部１が行っており、詳細については従来周知であるから省略する。   Further, in order to extend the battery life of the battery power supply unit 6 as much as possible, the control unit 1 repeatedly counts a predetermined time interval (intermittent reception interval) with a timer (timer means) built in the microcomputer and completes counting of the intermittent reception interval. Each time, the wireless transceiver 2 is activated to check whether or not a desired radio wave (a radio signal transmitted by another radio device TR) can be received. If the radio wave is not detected, the radio transceiver 2 is immediately stopped. The average power consumption is greatly reduced by shifting to the standby state. The radio wave reception check is performed based on the received signal strength indication signal (Receiving Signal Strength Indication: RSSI signal) output from the wireless transmission / reception unit 2 and is a DC voltage signal proportional to the magnitude of the received signal strength. The details are well known in the art and will be omitted.

さらに特定の無線機ＴＲ１の制御部１では、定期的に無線送受信部２を起動して他の無線機ＴＲ２，ＴＲ３，…が正常に動作しているか否かの確認（生死確認）を行うために確認メッセージを含む無線信号を送信させるとともに、無線送受信部２を受信状態に切り替えて各無線機ＴＲ２，…から送信される応答メッセージを含む無線信号を受信し、確認メッセージを含む無線信号を送信してから所定時間内に応答メッセージを含む無線信号を送信してこない無線機ＴＲがあれば、報知部５が備えるブザーを駆動して報知音を鳴動させるなどして無線機ＴＲに異常（電池切れなど）が発生したことを知らせる機能も有している。すなわち、本実施形態では制御部１が送信制御手段並びに受信制御手段に相当する。   Further, the control unit 1 of a specific radio TR1 periodically activates the radio transmission / reception unit 2 to check whether the other radios TR2, TR3,. Transmits a radio signal including a confirmation message, receives the radio signal including a response message transmitted from each of the radio devices TR2,... And transmits the radio signal including the confirmation message. If there is a wireless device TR that does not transmit a wireless signal including a response message within a predetermined time, the wireless device TR is abnormal (battery) by driving a buzzer provided in the notification unit 5 to sound a notification sound. It also has a function of notifying that a break has occurred. That is, in the present embodiment, the control unit 1 corresponds to a transmission control unit and a reception control unit.

図２（ａ）は無線機ＴＲが送受信する無線信号のデータフォーマットを示しており、同期ビット（プリアンブル：ＰＡ）、フレーム同期パターン（ユニークワード：ＵＷ）、宛先アドレスＤＡ、送信元アドレスＳＡ、メッセージＭ、ＣＲＣ符号で１フレームが構成されている。ここで、宛先アドレスＤＡとして各無線機ＴＲの識別符号を設定すれば当該識別符号の無線機ＴＲのみが無線信号を受信してメッセージを取得することになるが、宛先アドレスＤＡとして何れの無線機ＴＲにも割り当てられていない特殊なビット列（例えば、すべてのビットを１としたビット列）を設定することで無線信号を同報（ブロードキャスト）して全ての無線機ＴＲにメッセージを取得させることができる。例えば、火災発生等のイベント発生を通知するための通知メッセージを含む無線信号が全ての無線機ＴＲに同報される。なお、制御部１は１フレーム分の無線信号を１回の送信期間内で送信可能な数だけ連続して無線送受信部２から送信させる（図２（ｂ）参照）。   FIG. 2A shows a data format of a radio signal transmitted / received by the radio equipment TR, and includes a synchronization bit (preamble: PA), a frame synchronization pattern (unique word: UW), a destination address DA, a source address SA, and a message. One frame is composed of M and CRC codes. Here, if the identification code of each wireless device TR is set as the destination address DA, only the wireless device TR of the identification code receives a radio signal and acquires a message. By setting a special bit string (for example, a bit string in which all bits are set to 1) that is not assigned to the TR, the radio signal can be broadcast (broadcast) and all the radio devices TR can acquire the message. . For example, a radio signal including a notification message for notifying the occurrence of an event such as a fire is broadcast to all the radio devices TR. Note that the control unit 1 causes the radio transmission / reception unit 2 to continuously transmit one frame of radio signals by the number that can be transmitted within one transmission period (see FIG. 2B).

また本実施形態では、宛先アドレスＤＡからメッセージＭにおいて、制御部１が、本来のデータ（フレーム同期パターンＵＷ、宛先アドレスＤＡ、送信元アドレスＳＡ、メッセージＭ、ＣＲＣ符号）を８ビット（１バイト）毎に区切り、１バイトのデータビット（Data）の間に所定のビットパターン、例えば、０と１を交互に並べた８ビット（１バイト）のビットパターン（以下、識別用ビットパターンという。）ＢＰを定期的に挿入している。また、無線送受信部２で復調されたデータが制御部１に取り込まれ、制御部１において当該データ中に含まれる識別用ビットパターンＢＰが検出される。すなわち、本実施形態では制御部１が識別用ビットパターン挿入手段並びに識別用ビットパターン検出手段に相当する。   In this embodiment, in the message M from the destination address DA, the control unit 1 converts the original data (frame synchronization pattern UW, destination address DA, source address SA, message M, CRC code) to 8 bits (1 byte). A predetermined bit pattern between 1-byte data bits (Data), for example, an 8-bit (1-byte) bit pattern in which 0 and 1 are alternately arranged (hereinafter referred to as an identification bit pattern) BP Are inserted regularly. Further, the data demodulated by the radio transmission / reception unit 2 is taken into the control unit 1, and the control unit 1 detects the identification bit pattern BP included in the data. That is, in the present embodiment, the control unit 1 corresponds to an identification bit pattern insertion unit and an identification bit pattern detection unit.

次に、図３のフローチャートを参照しながら本実施形態の送受信動作について説明する。   Next, the transmission / reception operation of this embodiment will be described with reference to the flowchart of FIG.

制御部１はタイマ（図示せず）によって間欠受信間隔を繰り返しカウントしており、間欠受信間隔が経過する毎に無線送受信部２を起動してＲＳＳＩ信号による電波チェックを実行する。制御部１は電波チェックによって電波が捉えられれば無線送受信部２による受信動作を開始し、電波チェックによって電波が捉えられなければ無線送受信部２を停止させて間欠受信間隔のカウントを再開する。電波チェックで電波が捉えられた場合、制御部１は所定時間（１フレーム分の時間）内にフレーム同期パターンＵＷを受信してフレーム同期が取れれば引き続いて受信動作を継続する。   The control unit 1 repeatedly counts the intermittent reception interval by a timer (not shown), and activates the wireless transmission / reception unit 2 to execute a radio wave check using an RSSI signal every time the intermittent reception interval elapses. If the radio wave is detected by the radio wave check, the control unit 1 starts the reception operation by the wireless transmission / reception unit 2, and if the radio wave is not caught by the radio wave check, the control unit 1 stops the radio transmission / reception unit 2 and restarts the counting of the intermittent reception interval. When the radio wave is detected by the radio wave check, the control unit 1 receives the frame synchronization pattern UW within a predetermined time (a time corresponding to one frame) and continues the reception operation if the frame synchronization is established.

フレーム同期が完了した後、制御部１は受信した無線信号の宛先アドレスＤＡが同報用の特殊なビット列（例えば、全てのビットが１であるもの）又は自己の識別符号に一致するか否かを判断する。ここで、火災発生等のイベント発生を通知するための通知メッセージや生死確認のための確認メッセージについては宛先アドレスＤＡに前記特殊なビット列を設定することで全ての無線機ＴＲに同報されるが、通知メッセージや確認メッセージに対する応答メッセージのように特定の無線機ＴＲにのみ送信する無線信号については当該無線機ＴＲの識別符号が宛先アドレスＤＡに設定される。従って、制御部１では宛先アドレスＤＡにより同報若しくは自分宛と判断した場合は引き続いてメッセージＭを受信するが、宛先アドレスＤＡにより同報及び自分宛でないと判断した場合は無線送受信部２を停止させて間欠受信間隔のカウントを再開する。さらに、制御部１はＣＲＣ符号による伝送誤りチェックを行い、伝送誤りがなく正常に受信できれば受信したメッセージＭの内容に応じた処理、例えば、報知部５から報知音を鳴動させてイベントの発生（火災発生など）を報知する。   After the frame synchronization is completed, the control unit 1 determines whether or not the destination address DA of the received radio signal matches a special bit string for broadcast (for example, all bits are 1) or its own identification code. Judging. Here, a notification message for notifying the occurrence of an event such as the occurrence of a fire or a confirmation message for confirming the life or death is broadcast to all the radio devices TR by setting the special bit string in the destination address DA. For a radio signal transmitted only to a specific radio device TR such as a response message to a notification message or a confirmation message, the identification code of the radio device TR is set as the destination address DA. Accordingly, the control unit 1 receives the message M when it is determined to be broadcast or addressed to itself by the destination address DA, but stops the wireless transmission / reception unit 2 if it is determined not to be broadcast or addressed to itself by the destination address DA. To restart counting intermittent reception intervals. Further, the control unit 1 performs a transmission error check using a CRC code, and if there is no transmission error and the signal can be normally received, processing according to the content of the received message M, for example, generating a notification sound from the notification unit 5 to generate an event ( Notification of fire).

一方、所定時間内にフレーム同期が取れなかったりあるいは伝送誤りが生じて無線信号の受信に失敗したとしても、制御部１は宛先アドレスＤＡ、送信元アドレスＳＡ、メッセージＭの少なくとも何れかにおいて識別用ビットパターンＢＰが検出されていれば再度電波チェックを行い、識別用ビットパターンＢＰが一度も検出されていなければ無線送受信部２を停止させて間欠受信間隔のカウントを再開する。   On the other hand, even if frame synchronization cannot be achieved within a predetermined time or reception of a radio signal fails due to a transmission error, the control unit 1 does not recognize at least one of the destination address DA, the source address SA, and the message M. If the bit pattern BP is detected, the radio wave check is performed again. If the identification bit pattern BP has never been detected, the wireless transmission / reception unit 2 is stopped and the counting of the intermittent reception interval is restarted.

このように本実施形態によれば、無線送受信部２が起動するタイミングあるいはノイズの影響等によって無線信号の受信に失敗したとしても、無線信号に挿入されている識別用ビットパターンＢＰを検出していれば無線送受信部２を停止せずに引き続き受信動作を継続するので、間欠受信によって無線機ＴＲの消費電力を低減しつつ、再度間欠受信間隔が経過するまで無線送受信部２を停止する場合と比較して無線信号を正常に受信できるまでの時間、すなわち、情報伝送の遅延時間を短縮することができる。なお、本実施形態では０と１を交互に並べた８ビット（１バイト）のビットパターンを識別用ビットパターンＢＰとしているので、同期ビットＰＡだけでなく識別用ビットパターンＢＰを用いてビット同期を取ることができ、受信時にビット同期を取りやすくなるという利点がある。特に、無線送受信部２が周波数偏移変調（ＦＳＫ）方式のような２値変調方式を採用している場合において有効であり、また、２値変調方式であれば無線送受信部２における変調回路、復調回路として簡易なものが利用できるという利点がある。但し、識別用ビットパターンのビット列やビット長はこれに限定されるものではない。また、識別用ビットパターンＢＰを必ずしも複数挿入する必要はなく、１フレームに１つだけ挿入してもよいし、複数の識別用ビットパターンＢＰを挿入する場合においても必ずしも定期的に挿入しなくてもよい。但し、１フレーム内に１つしか識別用ビットパターンＢＰを挿入しない場合、ノイズによって識別用ビットパターンＢＰが受信できない虞があるから複数の識別用ビットパターンＢＰを挿入する方が望ましく、さらに、複数の識別用ビットパターンＢＰを定期的に挿入することでランダムに発生するノイズの影響で識別用ビットパターンＢＰが検出できなくなる率を減らすことができる。   As described above, according to the present embodiment, the identification bit pattern BP inserted in the wireless signal is detected even if reception of the wireless signal fails due to the timing at which the wireless transmission / reception unit 2 is activated or the influence of noise. Then, since the reception operation is continued without stopping the wireless transmission / reception unit 2, the wireless transmission / reception unit 2 is stopped until the intermittent reception interval elapses again while reducing the power consumption of the radio TR by intermittent reception. In comparison, it is possible to shorten the time until the wireless signal can be normally received, that is, the delay time of information transmission. In this embodiment, an 8-bit (1 byte) bit pattern in which 0 and 1 are alternately arranged is used as the identification bit pattern BP. Therefore, bit synchronization is performed using not only the synchronization bit PA but also the identification bit pattern BP. There is an advantage that bit synchronization can be easily obtained at the time of reception. In particular, it is effective when the wireless transmission / reception unit 2 employs a binary modulation scheme such as a frequency shift keying (FSK) scheme, and if it is a binary modulation scheme, a modulation circuit in the wireless transmission / reception unit 2; There is an advantage that a simple demodulator can be used. However, the bit string and bit length of the identification bit pattern are not limited to this. Further, it is not always necessary to insert a plurality of identification bit patterns BP, and only one identification bit pattern BP may be inserted in one frame. Even when a plurality of identification bit patterns BP are inserted, they may not be inserted periodically. Also good. However, when only one identification bit pattern BP is inserted in one frame, it is desirable to insert a plurality of identification bit patterns BP because there is a possibility that the identification bit pattern BP cannot be received due to noise. By periodically inserting the identification bit pattern BP, the rate at which the identification bit pattern BP cannot be detected due to the influence of randomly generated noise can be reduced.

本発明の実施形態を示すシステム構成図である。It is a system configuration figure showing an embodiment of the present invention. （ａ）は同上における無線信号のデータフォーマット、（ｂ）は送信時のタイムチャートである。(A) is the data format of the radio signal in the above, and (b) is a time chart at the time of transmission. 同上の動作説明用のフローチャートである。It is a flowchart for operation | movement description same as the above.

符号の説明Explanation of symbols

１ 制御部（識別用ビットパターン挿入手段、識別用ビットパターン検出手段、送信制御手段、受信制御手段）
２ 無線送受信部（送信手段、受信手段）
４ イベント発生部
５ 報知部
６ 電池電源部 1 control unit (identification bit pattern insertion means, identification bit pattern detection means, transmission control means, reception control means)
2 Radio transceiver (transmitting means, receiving means)
4 Event generation part 5 Notification part 6 Battery power supply part

Claims (3)

複数の無線機を備え、これら複数の無線機の間で無線信号を伝送する無線伝送システムであって、
各無線機は、無線信号を送信する送信手段若しくは無線信号を受信する受信手段の少なくとも何れか一方と、電源供給用の電池とを共通に具備し、
送信手段を具備する無線機は、無線信号の１フレーム内に所定の識別用ビットパターンを挿入する識別用ビットパターン挿入手段と、所定のイベントが発生したときに送信手段を起動し、所定の送信期間に無線信号を送信させるとともに所定の休止期間に無線信号の送信を休止させる動作を交互に繰り返し且つ前記イベントが発生していないときには送信手段を停止させる送信制御手段とを具備し、
受信手段を具備する無線機は、受信手段で受信する無線信号の識別用ビットパターンを検出する識別用ビットパターン検出手段と、一定の間欠受信間隔を繰り返しカウントするタイマ手段と、タイマ手段による間欠受信間隔のカウント中は受信手段を停止させ、タイマ手段による間欠受信間隔のカウントが完了する度に受信手段を起動する受信制御手段とを具備し、
受信制御手段は、受信手段にて所望の電波が捉えられたら無線信号を受信し、所望の電波が捉えられなければ受信手段を停止させ、さらに無線信号の受信に失敗しても識別用ビットパターン検出手段が識別用ビットパターンを検出すれば受信手段を停止させずに引き続き受信動作を継続することを特徴とする無線伝送システム。 A wireless transmission system comprising a plurality of wireless devices and transmitting wireless signals between the plurality of wireless devices,
Each radio unit includes at least one of a transmission unit that transmits a radio signal or a reception unit that receives a radio signal, and a battery for power supply in common.
A wireless device having a transmission means activates the transmission means when a predetermined event occurs, and an identification bit pattern insertion means for inserting a predetermined identification bit pattern in one frame of a wireless signal, and performs predetermined transmission. Transmission control means for transmitting a radio signal in a period and alternately repeating an operation for stopping transmission of a radio signal in a predetermined pause period and stopping the transmission means when the event has not occurred,
A radio apparatus having a receiving means includes an identification bit pattern detecting means for detecting an identification bit pattern of a radio signal received by the receiving means, a timer means for repeatedly counting a constant intermittent reception interval, and intermittent reception by the timer means. A reception control means for stopping the reception means during the counting of the interval and starting the reception means every time counting of the intermittent reception interval by the timer means is completed,
The reception control means receives a radio signal when a desired radio wave is captured by the reception means, stops the reception means if the desired radio wave is not captured, and further identifies the bit pattern for identification even if reception of the radio signal fails A radio transmission system characterized in that if the detecting means detects an identification bit pattern, the receiving operation is continued without stopping the receiving means. 識別用ビットパターン挿入手段は、１フレーム内に複数の識別用ビットパターンを挿入することを特徴とする請求項１記載の無線伝送システム。   2. The wireless transmission system according to claim 1, wherein the identification bit pattern insertion means inserts a plurality of identification bit patterns in one frame. 識別用ビットパターン挿入手段は、複数の識別用ビットパターンを略定期的に挿入することを特徴とする請求項２記載の無線伝送システム。   3. The wireless transmission system according to claim 2, wherein the identification bit pattern insertion means inserts a plurality of identification bit patterns substantially regularly.
JP2007008547A 2007-01-17 2007-01-17 Wireless transmission system Expired - Fee Related JP4830865B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2007008547A JP4830865B2 (en) 2007-01-17 2007-01-17 Wireless transmission system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2007008547A JP4830865B2 (en) 2007-01-17 2007-01-17 Wireless transmission system

Publications (2)

Publication Number Publication Date
JP2008177790A true JP2008177790A (en) 2008-07-31
JP4830865B2 JP4830865B2 (en) 2011-12-07

Family

ID=39704486

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2007008547A Expired - Fee Related JP4830865B2 (en) 2007-01-17 2007-01-17 Wireless transmission system

Country Status (1)

Country Link
JP (1) JP4830865B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010141380A (en) * 2008-12-09 2010-06-24 Panasonic Electric Works Co Ltd Radio transmitter, and radio communication system
JP2010220194A (en) * 2009-02-23 2010-09-30 Panasonic Electric Works Co Ltd Wireless communication system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05292564A (en) * 1992-04-09 1993-11-05 Matsushita Electric Ind Co Ltd Transmission/reception system
JPH06326649A (en) * 1993-05-14 1994-11-25 Nec Corp Selective radio call signal receiver
JPH07170557A (en) * 1993-12-16 1995-07-04 Nec Corp Radio selective call receiver with battery saving function

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05292564A (en) * 1992-04-09 1993-11-05 Matsushita Electric Ind Co Ltd Transmission/reception system
JPH06326649A (en) * 1993-05-14 1994-11-25 Nec Corp Selective radio call signal receiver
JPH07170557A (en) * 1993-12-16 1995-07-04 Nec Corp Radio selective call receiver with battery saving function

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010141380A (en) * 2008-12-09 2010-06-24 Panasonic Electric Works Co Ltd Radio transmitter, and radio communication system
JP2010220194A (en) * 2009-02-23 2010-09-30 Panasonic Electric Works Co Ltd Wireless communication system

Also Published As

Publication number Publication date
JP4830865B2 (en) 2011-12-07

Similar Documents

Publication Publication Date Title
JP4848963B2 (en) Wireless transmission system
JP5513737B2 (en) Fire alarm system
JP5091492B2 (en) Wireless transmission system
JP5044470B2 (en) Fire alarm system
JP2009230406A (en) Wireless transmission system
JP4830865B2 (en) Wireless transmission system
JP5192907B2 (en) Fire alarm system
JP5134424B2 (en) Fire alarm system
JP4915921B2 (en) Wireless transmission system
JP5027517B2 (en) Wireless transmission system
JP4674587B2 (en) Wireless transmission system
JP5060135B2 (en) Wireless transmission system
JP5054550B2 (en) Wireless transmission system
JP4466791B2 (en) Fire alarm system
JP5204407B2 (en) Wireless transmission system
JP4525851B2 (en) Fire alarm system
JP2011114394A (en) Radio communication system
JP2009265762A (en) Fire alarm system
JP5395878B2 (en) Wireless fire alarm system
JP3051462B2 (en) Wireless alarm device
JP4525850B2 (en) Fire alarm system
JP5520354B2 (en) Fire alarm system
JP5369060B2 (en) Fire alarm system
JP2009251907A (en) Fire alarm system
JP2013175154A (en) Wireless communication system

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20090716

RD04 Notification of resignation of power of attorney

Free format text: JAPANESE INTERMEDIATE CODE: A7424

Effective date: 20100906

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20110111

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20110517

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20110719

A911 Transfer of reconsideration by examiner before appeal (zenchi)

Free format text: JAPANESE INTERMEDIATE CODE: A911

Effective date: 20110726

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20110823

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20110905

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140930

Year of fee payment: 3

LAPS Cancellation because of no payment of annual fees