JP2004053355A - Power-saving method for radio system - Google Patents

Power-saving method for radio system Download PDF

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JP2004053355A
JP2004053355A JP2002209668A JP2002209668A JP2004053355A JP 2004053355 A JP2004053355 A JP 2004053355A JP 2002209668 A JP2002209668 A JP 2002209668A JP 2002209668 A JP2002209668 A JP 2002209668A JP 2004053355 A JP2004053355 A JP 2004053355A
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time
transmission
reception
station
power
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Japanese (ja)
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Hiroshi Takeuchi
竹内　寛
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NEC Platforms Ltd
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NEC AccessTechnica Ltd
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    • 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

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Abstract

<P>PROBLEM TO BE SOLVED: To effectively save electric power consumption in a sub-station, in a radio system having a plurality of sub-stations for notifying an observation data, a monitored data and the like at an assigned times. <P>SOLUTION: An electric power source switch control part 116 of a radio unit 11 in the sub-station turns off an electric power source switch 115 as an initial set. The control part 116 reads out a time data when the electric power source switch stored in a time memory 118 is turned on, compares an electric power source switch-on time indicated by the time data with the present time output from a timer part 117 to turn on the power switch 115 when conformed each other, and operates a reception part 111 and a communication control part 112 to start communication with a main station. An electric power source switch-off time data stored in the memory 118 is read out to turn off the power switch 115 when the electric power source switch-off time indicated by the time data is consistent with the present time output from the timer part 117. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は無線システムのパワーセーブ方式に関し、特に観測データや監視データ等を指定時刻に通報する複数の子局からなる無線システムのパワーセーブ方式に関する。
【０００２】
【従来の技術】
一般に無線システムは、親局を中心に複数の子局および中継局が散在して構成される。なお中継局は、親局と子局との間に介在して信号の中継を行う機能を有し、必要に応じて設置される。
【０００３】
このような無線システムにおいて、子局および中継局の消費電力を節減するパワーセーブ方式としては、親局から周期的にパワーセーブ信号を送出し、各子局および中継局はパワーセーブ信号を受信したときに動作するようにした方式、あるいは、各子局および中継局が短周期で間欠的に動作して着信情報を確認するようにした方式等がある。
【０００４】
【発明が解決しようとする課題】
しかし、上述した従来例の前者では、親局から周期的に送信されるパワーセーブ信号を受信するために、各子局および中継局は常に受信部を動作させておく必要があるので消費電力を十分に低減できない。
【０００５】
また後者では、受信部を常に短周期（秒単位）で間欠的に動作させている。しかし、各子局が観測データや監視データ等を指定時刻に通報する機能を有し、親局が各子局からの観測データや監視データ等を収集すると共に各子局を制御するような無線システムの場合は、短周期でデータを収集したり制御したりする必要はないので、短周期で間欠動作させても無駄な電力が消費されることになる。
【０００６】
本発明の目的は、特に観測データや監視データ等を指定時刻に通報する複数の子局を有する無線システムにおいて、子局の消費電力を効果的に節減できるパワーセーブ方式を提供することにある。
【０００７】
【課題を解決するための手段】
本発明の無線システムのパワーセーブ方式は、観測データや監視データ等を予め指定された時刻に親局へ通報すると共に親局から送信されてくる制御情報を受信する無線ユニットを備える複数の子局からなる無線システムのパワーセーブ方式であって、前記無線ユニットは、前記親局との通信を行う送受信手段と、前記予め指定された時刻になったときに前記送受信手段への電源供給を自発的にＯＮ／ＯＦＦ制御して送受信動作を開始／停止させる電源供給制御手段とを備える。
【０００８】
また、前記無線ユニットの送受信手段は、予め指定された中継対象の子局の信号を受信して再送信する中継処理機能を具備し、前記無線ユニットの電源供給制御手段は、前記送受信手段への電源供給を一定周期でＯＮ／ＯＦＦして前記送受信手段に前記中継対象の子局から送信される信号を監視させ、前記送受信手段が前記中継対象の子局の信号を受信したときに、前記送受信手段への電源供給を所定時間だけＯＮして前記送受信手段に中継処理を実行させる。
【０００９】
更に、前記電源供給制御手段は、前記送受信手段への電源供給をＯＮ／ＯＦＦする電源スイッチと、現在の時刻を計測するタイマ部と、前記電源スイッチのＯＮ／ＯＦＦ時刻を示す時刻データが予め格納される時刻メモリと、前記タイマ部が出力する現在の時刻と前記時刻メモリに格納された時刻データが示す時刻とを比較し一致したときに前記電源スイッチをＯＮ／ＯＦＦする電源スイッチ制御部とを有している。
【００１０】
また更に、前記送受信手段は、送受信動作時に前記親局から受信する制御情報に電源スイッチのＯＮ／ＯＦＦ時刻を示す時刻データが含まれるいるときに、前記時刻メモリに格納されている時刻データを新たに受信した時刻データにより更新する。
【００１１】
上記構成において、前記子局の局舎内もしくは前記無線ユニット内に設けられて異常事態を検知するためのセンサの出力値が閾値を超えたときに異常事態発生を通報する異常事態検知手段を具備し、前記電源供給制御手段は、前記異常事態検知手段から前記異常事態発生の通報を受けたときは強制的に前記送受信手段への電源供給を所定時間だけＯＮして前記送受信手段を動作させ前記異常事態発生を前記親局へ通報させる。
【００１２】
また、前記異常事態検知手段が、観測データや監視データ等を監視し、そのデータ値が閾値を超えたときに異常事態発生を通報するようにしてもよい。
【００１３】
【発明の実施の形態】
次に本発明について図面を参照して説明する。
【００１４】
図１は本発明における無線システムの一例を示す構成図であり、観測データや監視データ等（観測／監視データ）を予め指定された時刻に親局へ通報する複数の子局１と、各子局の観測／監視データを収集すると共に各子局を制御する親局３と、子局１と親局３との間に介在して子局１と同じ機能を有すると共に中継処理を行う子局兼中継局２とで構成される。
【００１５】
ここで、子局１は、親局３との通信を行う無線ユニット１１と、観測／監視を行う観測／監視機器１２とを備えている。また、子局兼中継局２は、子局１とハード的に同じ構成であるが、親局３から指定される子局の信号を受信して再送信する中継処理機能を具備する無線ユニット２１と、観測／監視を行う観測／監視機器１２とを備えている。
【００１６】
図２は子局１の一実施形態を示すブロック図である。
【００１７】
子局１の無線ユニット１１は、予め指定される送受信時間に、観測／監視機器１２から出力される観測／監視データを親局３へ送信すると共に、親局３から送信されてくる制御情報を受信する。
【００１８】
無線ユニット１１は、図２に示したように、アンテナ１１０を介して送受信を行う送受信部１１１と、送受信データを処理すると共に送受信部１１１を制御する通信制御部１１２と、データ処理プログラムや送受信制御プログラム等を格納するメモリ１１３と、無線ユニット１１の電源を生成する電源部１１４と、送受信部１１１および通信制御部１１２への電源供給をＯＮ／ＯＦＦする電源スイッチ１１５と、電源スイッチ１１５のＯＮ／ＯＦＦを制御する電源スイッチ制御部１１６と、現在の時刻を計測するタイマ部１１７と、電源スイッチのＯＮ／ＯＦＦ時刻を示す時刻データを格納する時刻メモリ１１８とを有している。
【００１９】
ここで、電源スイッチ１１５、電源スイッチ制御部１１６およびタイマ部１１７には、常時、電源部１１４から電源を供給されている。
【００２０】
また、電源スイッチのＯＮ／ＯＦＦ時刻データは、無線システム構築時に、その初期値が時刻メモリ１１８に保存されるが、その後、親局との通信時に、親局から送信されてくる制御情報に含まれる時刻データにより更新される。
【００２１】
次に動作を説明する。
【００２２】
図３は電源スイッチ制御部１１６の動作を示すフローチャートである。
【００２３】
初期設定として電源スイッチ１１５をＯＦＦする（ステップ２０１）。そして、時刻メモリ１１８に予め格納されている電源スイッチＯＮ時刻データを読出し、この時刻データが示す電源スイッチＯＮ時刻とタイマ部１１７から出力される現在の時刻とを比較し（ステップ２０２）、一致したときに（ステップ２０３）、電源スイッチ１１５をＯＮする（ステップ２０４）。
【００２４】
その後、時刻メモリ１１８に予め格納されている電源スイッチＯＦＦ時刻データを読出し、この時刻データが示す電源スイッチＯＦＦ時刻とタイマ部１１７から出力される現在の時刻とを比較し（ステップ２０５）、一致したときに（ステップ２０６）、電源スイッチ１１５をＯＦＦする（ステップ２０７）。そして、ステップ２０２に戻り、ステップ２０２からステップ２０７までのステップを繰り返す。
【００２５】
さて、電源スイッチ１１５がＯＮすることにより、電源が送受信部１１１および通信制御部１１２へ供給されるので、親局との送受信が開始される。また電源スイッチ１１５がＯＦＦすることにより、送受信部１１１および通信制御部１１２への電源供給が停止されて送受信動作が停止する。
【００２６】
通信制御部１１２は、電源が供給されている時間、つまり送受信時間において、観測／監視機器１２から出力される観測／監視データに自局の識別コードおよび現在の時刻データを付与し、送受信部１１１からアンテナを介して送信させると共に、親局３から送信されてくる制御情報を受信する。
【００２７】
そして、この制御情報に電源スイッチのＯＮ／ＯＦＦ時刻を示する時刻データが含まれているときは、時刻メモリ１１８に格納されている時刻データを新たに受信した時刻データで更新する。
【００２８】
ところで、子局兼中継局２における無線ユニット２１は、図１に示した無線ユニット１１と同じ構成であるが、通信制御部１１２において中継処理を行う点が相違している。
【００２９】
この中継処理は、予め指定された子局の信号を受信して再送信する中継処理であり、例えば、無線システム構築時に予めメモリに格納された中継処理プログラムに基づき実行される。なお、この中継処理プログラムおよび中継対象の子局等は、その後に親局から送信される制御情報により更新可能である。
【００３０】
また、子局兼中継局２の無線ユニット２１は、中継対象の子局の送受信時間に応じて送受信を実行するように電源ＯＮ／ＯＦＦ時刻が指定される。
【００３１】
このように本発明では、子局１および子局兼中継局２が、予め指定された時刻になったときに、送受信部および通信制御部（送受信手段）へ自発的に電源を供給して送受信動作を開始し、その後、予め指定された時刻になったときに、送受信手段への電源供給を自発的に停止して送受信動作を停止することにより、指定された送受信時間以外では、消費電力が大きい送受信手段への電源供給を停止できるので、効果的に消費電力を節減できる。
【００３２】
なお、送受信手段への電源供給をＯＮ／ＯＦＦ制御するための電源スイッチ、電源スイッチ制御部およびタイマ部（電源供給制御手段）は常時動作しているが、その消費電力は送受信手段の消費電力に比較して極めて少なく、常時動作しても消費電力への影響は少ない。
【００３３】
図４は子局の他の一実施形態を示すブロック図である。
【００３４】
図１に示した構成要素と同じものには同一符号を付してある。また、図１に示した子局の構成との相違点は、異常事態の発生を検知する異常事態検知部１１９が設けられている点である。
【００３５】
異常事態検知部１１９は、例えば火災や不法侵入者等を検知するために、局舎内もしくは無線ユニットに設けられる温度センサや赤外線センサ等の出力を監視し、センサ出力値が閾値を超えたときに電源スイッチ制御部１２０および通信制御部１２１へ異常事態発生を通報する。
【００３６】
そして、異常事態発生の通知を受けた電源スイッチ制御部１２０は、直ちに電源スイッチ１１５をＯＮし、送受信部１１１および通信制御部１２１を動作させて異常事態発生を親局へ通報させる。
【００３７】
なお、異常事態検知部１１９が、観測／監視機器１２の出力データの内の特定のデータを監視し、そのデータ値が閾値を超えたときに異常事態発生を通報するようにしてもよい。
【００３８】
図５は電源スイッチ制御部１２０の動作を示すフローチャートである。
【００３９】
ここで、ステップ３０１からステップ３０７までの動作は、図２に示した電源スイッチ制御部１１６の動作ステップ２０１からステップ２０７までと同じである。
【００４０】
すなわち、初期設定として電源スイッチ１１５をＯＦＦする（ステップ３０１）。そして、時刻メモリ１１８に予め格納されている電源スイッチＯＮ時刻データを読出し、この時刻データが示す電源スイッチＯＮ時刻とタイマ部１１７から出力される現在の時刻とを比較し（ステップ３０２）、一致したときに（ステップ３０３）、電源スイッチ１１５をＯＮする（ステップ３０４）。
【００４１】
その後、時刻メモリ１１８に予め格納されている電源スイッチＯＦＦ時刻データを読出し、この時刻データが示す電源スイッチＯＦＦ時刻とタイマ部１１７から出力される現在の時刻とを比較し（ステップ３０５）、一致したときに（ステップ３０６）、電源スイッチ１１５をＯＦＦする（ステップ３０７）。そして、ステップ３０２に戻り、ステップ３０２からステップ３０７までのステップを繰り返す。
【００４２】
さて、電源スイッチ制御部１２０では、ステップ３０３において電源スイッチＯＮ時刻と現在の時刻とが不一致であっても、異常事態発生通知を受けたときは（ステップ３０８）、電源スイッチ１１５をＯＮする（ステップ３０９）。そして、通報に要する所定時間が経過したときに（ステップ３１０）、電源スイッチ１１５をＯＦＦする（ステップ３０７）。
【００４３】
ところで、このように子局が異常事態検知時に送受信動作を行う場合、子局兼中継局２においても中継対象の子局に合わせて送受信動作を行う必要がある。
【００４４】
このため、子局兼中継局２の無線ユニット２１の電源スイッチ制御部１２０は、一定周期で電源をＯＮ／ＯＦＦして中継対象の子局から送信される信号を送受信手段に監視させ、送受信手段が中継対象の子局からの送信信号を受信したときに、中継に要する所定時間だけ電源をＯＮして送受信手段に中継処理を実行させるように構成する。
【００４５】
このようにすることにより、各子局や子局兼中継局において異常事態検知手段により異常事態の発生を検知したときは、予め指定された送受信時間以外であっても強制的に送受信手段へ電源を供給して異常事態の発生を親局へ早期に通報できる。
【００４６】
【発明の効果】
以上説明したように本発明によれば、特に観測データや監視データ等を指定時刻に通報する複数の子局や子局兼中継局からなる無線システムにおいて、各子局や子局兼中継局は、予め指定された送受信時間以外では、消費電力が大きい送受信手段への電源供給を停止し、予め指定された送受信開始時刻になると自発的に送受信手段へ電源を供給して送受信状態になるので、各子局や子局兼中継局の消費電力を効果的に節減でき、バッテリ等の電源の小型化を実現できる。
【００４７】
また、各子局および子局兼中継局が送受信状態のときに、親局が送信する制御情報に基づき、各子局および子局兼中継局の送受信開始時刻データや処理プログラム等の更新を行うことにより、消費電力を節減して多様かつ適切な制御が可能である。
【００４８】
更に、各子局および子局兼中継局において異常事態検知手段を設け、この異常事態検知手段が異常事態発生を検知したときは、予め指定された送受信時間以外であっても強制的に送受信手段へ電源を供給することにより、異常事態発生を親局へ早期に通報でき、早期対処が可能となる。
【図面の簡単な説明】
【図１】本発明における無線システムの一例を示す構成図である。
【図２】図１に示した子局１の一実施形態を示すブロック図である。
【図３】図２に示した電源スイッチ制御部１１６の動作を示すフローチャートである。
【図４】子局１の他の一実施形態を示すブロック図である。
【図５】図４に示した電源スイッチ制御部１２０の動作を示すフローチャートである。
【符号の説明】
１　　子局
２　　子局兼中継局
３　　親局
１１　　無線ユニット
１２　　観測／監視機器
１１１　　送受信部
１１２，１２１　　通信制御部
１１４　　電源部
１１５　　電源スイッチ
１１６，１２０　　電源スイッチ制御部
１１７　　タイマ部
１１８　　時刻メモリ
１１９　　異常事態検知部[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a power saving method of a wireless system, and more particularly to a power saving method of a wireless system including a plurality of slave stations that report observation data, monitoring data, and the like at a designated time.
[0002]
[Prior art]
In general, a wireless system is configured with a plurality of slave stations and relay stations scattered about a master station. The relay station has a function of interposing a signal between the master station and the slave station to relay a signal, and is installed as necessary.
[0003]
In such a wireless system, as a power save method for saving power consumption of the slave station and the relay station, a power save signal is periodically transmitted from the master station, and each slave station and the relay station receive the power save signal. There is a method in which each terminal station and the relay station operate intermittently in a short cycle to check incoming information, or the like.
[0004]
[Problems to be solved by the invention]
However, in the former case of the above-described conventional example, each of the slave stations and the relay station must always operate the receiving unit in order to receive the power save signal periodically transmitted from the master station. It cannot be reduced sufficiently.
[0005]
In the latter case, the receiving unit is always operated intermittently in a short cycle (second unit). However, each slave station has a function to report observation data, monitoring data, and the like at a designated time, and the master station collects observation data, monitoring data, and the like from each slave station and controls each slave station. In the case of a system, there is no need to collect and control data in a short cycle, so wasteful power is consumed even if the system is operated intermittently in a short cycle.
[0006]
An object of the present invention is to provide a power saving method that can effectively reduce power consumption of a slave station, particularly in a wireless system having a plurality of slave stations that report observation data, monitoring data, and the like at a designated time.
[0007]
[Means for Solving the Problems]
A power saving method for a wireless system according to the present invention includes a plurality of slave stations each including a wireless unit that notifies observation data, monitoring data, and the like to a master station at a predetermined time and receives control information transmitted from the master station. A wireless system, comprising: a transmitting / receiving unit that communicates with the master station; and a spontaneous power supply to the transmitting / receiving unit when the predetermined time is reached. Power supply control means for controlling ON / OFF to start / stop the transmission / reception operation.
[0008]
Further, the transmitting and receiving means of the wireless unit has a relay processing function of receiving and retransmitting a signal of a pre-designated relay target slave station, and the power supply control means of the wireless unit, The power supply is turned on / off at regular intervals to cause the transmission / reception means to monitor the signal transmitted from the relay target slave station. When the transmission / reception means receives the signal of the relay target slave station, the transmission / reception is performed. The power supply to the means is turned on for a predetermined time to cause the transmitting / receiving means to execute the relay processing.
[0009]
Further, the power supply control means includes a power switch for turning on / off the power supply to the transmission / reception means, a timer unit for measuring a current time, and time data indicating the ON / OFF time of the power switch. And a power switch control unit that turns on / off the power switch when the current time output from the timer unit is compared with the time indicated by the time data stored in the time memory and matches. Have.
[0010]
Further, when the control information received from the master station during the transmission / reception operation includes time data indicating the ON / OFF time of the power switch, the transmission / reception means newly updates the time data stored in the time memory. Is updated with the received time data.
[0011]
In the above configuration, an abnormal situation detecting means is provided in the station building of the slave station or in the wireless unit and notifies occurrence of an abnormal situation when an output value of a sensor for detecting the abnormal situation exceeds a threshold value. The power supply control means forcibly turns on the power supply to the transmission / reception means for a predetermined time when the notification of the occurrence of the abnormal situation is received from the abnormal situation detection means to operate the transmission / reception means. The occurrence of an abnormal situation is reported to the master station.
[0012]
Further, the abnormal situation detecting means may monitor observation data, monitoring data, and the like, and may report occurrence of an abnormal situation when the data value exceeds a threshold value.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the present invention will be described with reference to the drawings.
[0014]
FIG. 1 is a configuration diagram showing an example of a wireless system according to the present invention. A plurality of slave stations 1 that report observation data, monitoring data, etc. (observation / monitoring data) to a master station at a predetermined time, A master station 3 that collects observation / monitoring data of the station and controls each slave station; and a slave station that is interposed between the slave stations 1 and 3 and that has the same function as the slave station 1 and performs relay processing. And the relay station 2.
[0015]
Here, the slave station 1 includes a wireless unit 11 that communicates with the master station 3 and an observation / monitoring device 12 that performs observation / monitoring. The slave / relay station 2 has the same hardware configuration as the slave station 1, but has a relay processing function of receiving and retransmitting a signal of the slave station designated by the master station 3. And an observation / monitoring device 12 for performing observation / monitoring.
[0016]
FIG. 2 is a block diagram showing one embodiment of the slave station 1.
[0017]
The wireless unit 11 of the slave station 1 transmits observation / monitoring data output from the observation / monitoring device 12 to the master station 3 at a transmission / reception time designated in advance, and transmits control information transmitted from the master station 3 to the master station 3. Receive.
[0018]
As shown in FIG. 2, the wireless unit 11 includes a transmission / reception unit 111 that performs transmission / reception via the antenna 110, a communication control unit 112 that processes transmission / reception data and controls the transmission / reception unit 111, a data processing program and transmission / reception control. A memory 113 for storing programs and the like, a power supply unit 114 for generating power for the wireless unit 11, a power switch 115 for turning on / off power supply to the transmission / reception unit 111 and the communication control unit 112, and an ON / OFF of the power switch 115 It has a power switch control unit 116 for controlling OFF, a timer unit 117 for measuring the current time, and a time memory 118 for storing time data indicating ON / OFF time of the power switch.
[0019]
Here, the power switch 115, the power switch control unit 116, and the timer unit 117 are constantly supplied with power from the power unit 114.
[0020]
The ON / OFF time data of the power switch is stored in the time memory 118 when the wireless system is constructed, but is included in the control information transmitted from the master station when communicating with the master station. The time is updated by the time data.
[0021]
Next, the operation will be described.
[0022]
FIG. 3 is a flowchart showing the operation of the power switch control unit 116.
[0023]
The power switch 115 is turned off as an initial setting (step 201). Then, the power switch ON time data stored in advance in the time memory 118 is read, and the power switch ON time indicated by the time data is compared with the current time output from the timer unit 117 (step 202). Sometimes (step 203), the power switch 115 is turned on (step 204).
[0024]
Thereafter, the power switch OFF time data stored in advance in the time memory 118 is read, and the power switch OFF time indicated by the time data is compared with the current time output from the timer unit 117 (step 205). At time (step 206), the power switch 115 is turned off (step 207). Then, returning to step 202, the steps from step 202 to step 207 are repeated.
[0025]
When the power switch 115 is turned on, power is supplied to the transmission / reception unit 111 and the communication control unit 112, so that transmission / reception with the master station is started. When the power switch 115 is turned off, the power supply to the transmission / reception unit 111 and the communication control unit 112 is stopped, and the transmission / reception operation is stopped.
[0026]
The communication control unit 112 attaches the identification code of its own station and the current time data to the observation / monitoring data output from the observation / monitoring device 12 during the power supply time, that is, the transmission / reception time. , Via the antenna, and receives the control information transmitted from the master station 3.
[0027]
When the control information includes time data indicating the ON / OFF time of the power switch, the time data stored in the time memory 118 is updated with the newly received time data.
[0028]
By the way, the wireless unit 21 in the slave / relay station 2 has the same configuration as the wireless unit 11 shown in FIG. 1, but differs in that the communication control unit 112 performs a relay process.
[0029]
This relay process is a relay process for receiving and retransmitting a signal of a previously designated slave station, and is executed based on, for example, a relay process program stored in a memory when a wireless system is constructed. The relay processing program and the slave stations to be relayed can be updated by control information transmitted from the master station thereafter.
[0030]
The power ON / OFF time is specified so that the wireless unit 21 of the slave station / relay station 2 performs transmission / reception in accordance with the transmission / reception time of the slave station to be relayed.
[0031]
As described above, in the present invention, the slave station 1 and the slave / relay station 2 spontaneously supply power to the transmission / reception section and the communication control section (transmission / reception means) when the time designated in advance is reached. The operation is started, and thereafter, at a predetermined time, the power supply to the transmission / reception means is spontaneously stopped to stop the transmission / reception operation. Since power supply to a large transmitting / receiving means can be stopped, power consumption can be effectively reduced.
[0032]
The power switch for controlling ON / OFF of the power supply to the transmission / reception means, the power switch control section, and the timer section (power supply control means) are always operating. It is extremely small in comparison and has little effect on power consumption even if it is constantly operated.
[0033]
FIG. 4 is a block diagram showing another embodiment of the slave station.
[0034]
The same components as those shown in FIG. 1 are denoted by the same reference numerals. Further, the difference from the configuration of the slave station shown in FIG. 1 is that an abnormal situation detecting unit 119 for detecting occurrence of an abnormal situation is provided.
[0035]
The abnormal situation detection unit 119 monitors the output of a temperature sensor or an infrared sensor provided in a station or a wireless unit, for example, to detect a fire or an illegal intruder, and when the sensor output value exceeds a threshold value. Then, the power switch control unit 120 and the communication control unit 121 are notified of the occurrence of an abnormal situation.
[0036]
Then, upon receiving the notification of the occurrence of the abnormal situation, the power switch control section 120 immediately turns on the power switch 115 and operates the transmission / reception section 111 and the communication control section 121 to notify the master station of the occurrence of the abnormal situation.
[0037]
Note that the abnormal situation detecting unit 119 may monitor specific data among the output data of the observation / monitoring device 12 and report occurrence of an abnormal situation when the data value exceeds a threshold.
[0038]
FIG. 5 is a flowchart showing the operation of the power switch control unit 120.
[0039]
Here, the operation from step 301 to step 307 is the same as the operation from step 201 to step 207 of the power switch control unit 116 shown in FIG.
[0040]
That is, the power switch 115 is turned off as an initial setting (step 301). Then, the power switch ON time data stored in advance in the time memory 118 is read, and the power switch ON time indicated by the time data is compared with the current time output from the timer unit 117 (step 302). At times (step 303), the power switch 115 is turned on (step 304).
[0041]
Thereafter, the power switch OFF time data stored in advance in the time memory 118 is read, and the power switch OFF time indicated by the time data is compared with the current time output from the timer unit 117 (step 305). At time (step 306), the power switch 115 is turned off (step 307). Then, returning to step 302, the steps from step 302 to step 307 are repeated.
[0042]
Now, even if the power switch ON time and the current time do not match in step 303, the power switch control unit 120 turns on the power switch 115 when an abnormal situation occurrence notification is received (step 308) (step 308). 309). Then, when a predetermined time required for the notification has elapsed (step 310), the power switch 115 is turned off (step 307).
[0043]
When the slave station performs the transmission / reception operation when an abnormal situation is detected, the slave station / relay station 2 also needs to perform the transmission / reception operation in accordance with the slave station to be relayed.
[0044]
For this reason, the power switch control unit 120 of the wireless unit 21 of the slave station / relay station 2 turns on / off the power at regular intervals to cause the sending / receiving means to monitor a signal transmitted from the slave station to be relayed. When a transmission signal is received from a slave station to be relayed, the power is turned on for a predetermined time required for relaying, and the transmission / reception means is caused to execute the relay processing.
[0045]
In this way, when the occurrence of an abnormal situation is detected by the abnormal situation detecting means in each of the slave stations and the slave station and the relay station, the power is forcibly supplied to the transmitting and receiving means even during times other than the transmission and reception time designated in advance. To notify the master station of the occurrence of an abnormal situation at an early stage.
[0046]
【The invention's effect】
As described above, according to the present invention, in particular, in a wireless system including a plurality of slave stations and slave stations and relay stations that report observation data, monitoring data, and the like at a designated time, each slave station and slave station and relay station In other than the transmission / reception time specified in advance, the power supply to the transmission / reception means having large power consumption is stopped, and the power supply is spontaneously supplied to the transmission / reception means at the transmission / reception start time specified in advance, so that the transmission / reception state is established. The power consumption of each slave station and the slave station / relay station can be effectively reduced, and the size of a power source such as a battery can be reduced.
[0047]
In addition, when each slave station and the slave station / relay station are in the transmission / reception state, the transmission / reception start time data and the processing program of each slave station and the slave station / relay station are updated based on the control information transmitted by the master station. As a result, various and appropriate controls can be performed while saving power consumption.
[0048]
Further, an abnormal situation detecting means is provided in each of the slave stations and the slave station and the relay station, and when the abnormal situation detecting means detects the occurrence of the abnormal situation, the transmitting / receiving means is forcibly applied even if the transmission / reception time is not a predetermined transmission / reception time. By supplying power to the master station, the occurrence of an abnormal situation can be reported to the master station at an early stage, and early measures can be taken.
[Brief description of the drawings]
FIG. 1 is a configuration diagram illustrating an example of a wireless system according to the present invention.
FIG. 2 is a block diagram showing an embodiment of the slave station 1 shown in FIG.
FIG. 3 is a flowchart showing an operation of a power switch control unit shown in FIG. 2;
FIG. 4 is a block diagram showing another embodiment of the slave station 1.
FIG. 5 is a flowchart showing an operation of the power switch control unit 120 shown in FIG.
[Explanation of symbols]
Reference Signs List 1 slave station 2 slave / relay station 3 master station 11 wireless unit 12 observation / monitoring equipment 111 transmission / reception unit 112, 121 communication control unit 114 power supply unit 115 power switch 116, 120 power switch control unit 117 timer unit 118 time memory 119 abnormality Situation detection unit

Claims (6)

観測データや監視データ等を予め指定された時刻に親局へ通報すると共に親局から送信されてくる制御情報を受信する無線ユニットを備える複数の子局からなる無線システムのパワーセーブ方式であって、前記無線ユニットは、前記親局との通信を行う送受信手段と、前記予め指定された時刻になったときに前記送受信手段への電源供給を自発的にＯＮ／ＯＦＦ制御して送受信動作を開始／停止させる電源供給制御手段とを備えることを特徴とする無線システムのパワーセーブ方式。A power saving method of a wireless system including a plurality of slave stations including a wireless unit that notifies observation data, monitoring data, and the like to a master station at a predetermined time and receives control information transmitted from the master station. The wireless unit automatically initiates a transmission / reception operation by performing on / off control of power supply to the transmission / reception means when the predetermined time arrives, with the transmission / reception means performing communication with the master station. And a power supply control unit for stopping the power supply. 前記無線ユニットの送受信手段は、予め指定された中継対象の子局の信号を受信して再送信する中継処理機能を具備し、前記無線ユニットの電源供給制御手段は、前記送受信手段への電源供給を一定周期でＯＮ／ＯＦＦして前記送受信手段に前記中継対象の子局から送信される信号を監視させ、前記送受信手段が前記中継対象の子局の信号を受信したときに、前記送受信手段への電源供給を所定時間だけＯＮして前記送受信手段に中継処理を実行させることを特徴とする請求項１記載の無線システムのパワーセーブ方式。The transmission / reception unit of the wireless unit has a relay processing function of receiving and retransmitting a signal of a pre-specified slave station to be relayed, and the power supply control unit of the wireless unit supplies power to the transmission / reception unit. ON / OFF at regular intervals to cause the transmitting / receiving means to monitor the signal transmitted from the slave station to be relayed. When the transmitting / receiving means receives the signal of the slave station to be relayed, the signal is transmitted to the transmitting / receiving means. 2. The power saving method for a wireless system according to claim 1, wherein the power supply is turned on for a predetermined time to cause said transmitting / receiving means to execute a relay process. 前記電源供給制御手段は、前記送受信手段への電源供給をＯＮ／ＯＦＦする電源スイッチと、現在の時刻を計測するタイマ部と、前記電源スイッチのＯＮ／ＯＦＦ時刻を示す時刻データが予め格納される時刻メモリと、前記タイマ部が出力する現在の時刻と前記時刻メモリに格納された時刻データが示す時刻とを比較し一致したときに前記電源スイッチをＯＮ／ＯＦＦする電源スイッチ制御部とを有していることを特徴とする請求項１または２記載の無線システムのパワーセーブ方式。The power supply control means stores in advance a power switch for turning on / off power supply to the transmission / reception means, a timer section for measuring a current time, and time data indicating the ON / OFF time of the power switch. A time memory, and a power switch control unit for turning on / off the power switch when the current time output from the timer unit is compared with the time indicated by the time data stored in the time memory and they match. 3. The power saving method for a wireless system according to claim 1, wherein 前記送受信手段は、送受信動作時に前記親局から受信する制御情報に電源スイッチのＯＮ／ＯＦＦ時刻を示す時刻データが含まれるいるときに、前記時刻メモリに格納されている時刻データを新たに受信した時刻データにより更新することを特徴とする請求項３記載の無線システムのパワーセーブ方式。The transmission / reception unit newly receives the time data stored in the time memory when the control information received from the master station during the transmission / reception operation includes time data indicating an ON / OFF time of a power switch. 4. The power saving method for a wireless system according to claim 3, wherein the updating is performed based on time data. 前記子局の局舎内もしくは前記無線ユニット内に設けられて異常事態を検知するためのセンサの出力値が閾値を超えたときに異常事態発生を通報する異常事態検知手段を具備し、前記電源供給制御手段は、前記異常事態検知手段から前記異常事態発生の通報を受けたときは強制的に前記送受信手段への電源供給を所定時間だけＯＮして前記送受信手段を動作させ前記異常事態発生を前記親局へ通報させることを特徴とする請求項１または２記載の無線システムのパワーセーブ方式。An abnormal situation detecting means for reporting the occurrence of an abnormal situation when an output value of a sensor for detecting an abnormal situation, which is provided in the station of the slave station or in the wireless unit, exceeds a threshold value; The supply control means, when receiving the notification of the occurrence of the abnormal situation from the abnormal situation detection means, forcibly turns on the power supply to the transmission / reception means for a predetermined time, operates the transmission / reception means, and detects the occurrence of the abnormal situation. 3. The power saving method for a wireless system according to claim 1, wherein the notification is made to the master station. 前記観測データや監視データ等を監視し、そのデータ値が閾値を超えたときに異常事態発生を通報する異常事態検知手段を具備し、前記電源供給制御手段は、前記異常事態検知手段から前記異常事態発生の通報を受けたときは強制的に前記電源スイッチを所定時間だけＯＮして前記送受信手段を動作させ前記異常事態発生を前記親局へ通報させることを特徴とする請求項１または２記載の無線システムのパワーセーブ方式。An abnormal situation detecting means for monitoring the observation data, the monitoring data, and the like, and notifying the occurrence of an abnormal situation when the data value exceeds a threshold value, wherein the power supply control means comprises: 3. The system according to claim 1, wherein when a notification of the occurrence of a situation is received, the power switch is forcibly turned on for a predetermined time to operate the transmission / reception means to report the occurrence of the abnormal situation to the master station. Power saving method for wireless systems.
JP2002209668A 2002-07-18 2002-07-18 Power-saving method for radio system Pending JP2004053355A (en)

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