JP2007235344A - Radio communication system - Google Patents

Radio communication system Download PDF

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JP2007235344A
JP2007235344A JP2006052251A JP2006052251A JP2007235344A JP 2007235344 A JP2007235344 A JP 2007235344A JP 2006052251 A JP2006052251 A JP 2006052251A JP 2006052251 A JP2006052251 A JP 2006052251A JP 2007235344 A JP2007235344 A JP 2007235344A
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transmission
reception
data
time
repeater
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Katsuya Onose
克也 小野瀬
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Tokin Corp
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NEC Tokin Corp
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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 provide a radio communication system which saves on power consumption, has high precision in time information, and is hardly affected by an environmental condition. <P>SOLUTION: A radio communication system performs radio communication between a base station 1 connecting to a host device with the use of a cable, a repeater having a repeating function, and a radio sensor terminal having a detector. The base station 1 is constituted of: an antenna 7 for receiving standard electric wave; a clock 6 for correcting time with the antenna 7 for receiving the standard electric wave; a transmitting/receiving circuit 4 for transmission/reception; and a control unit 5 composed of a CPU 10 for executing a program stored in a storage 11 and a memory for storing the time of transmission/receition and the data of the detector, a transmission/reception control unit 12 for controlling transmission/reception based on the data of the storage 11 and data of the clock 6, and a power source control unit 13 for controlling power supply to the transmission/reception circuit 4 according to the data of the storage part 11 and the data of the clock 6. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、無線通信システムに関する。   The present invention relates to a wireless communication system.

最近、山岳部の地殻監視用センサ、住宅内の防犯・防火装置用センサおよびビルの空調設備用センサ等のセンサ端末に関する需要が急速に高まっている。とりわけ、設置場所を選ばない、電池電源によって長時間駆動する無線センサ端末が必要になっている。   Recently, the demand for sensor terminals such as sensors for crust monitoring in mountainous areas, sensors for crime prevention and fire prevention devices in houses, and sensors for air conditioning equipment in buildings has been rapidly increasing. In particular, there is a need for a wireless sensor terminal that can be driven for a long time by a battery power source, regardless of the installation location.

間欠受信を採用する通信システムが、無線センサ端末の低消費電力化に用いられている。従来の間欠受信を採用する通信システムを説明する図が図１１に示されている。図１１に示されるように、従来の間欠受信を採用する通信システムでは、受信回路の電源は、周期的（図中のＴ時間が１周期）にスイッチＯＮ状態になり、スイッチＯＮ状態の時で、相手から電波が送信される時にスイッチＯＮ状態を続けて復調動作を行う（図中のＡ区間）。また、受信回路の電源は、相手から電波が送信されない時にＯＦＦ状態になり、次の周期まで待機して節電する（図中のＢ区間）。   Communication systems that employ intermittent reception are used to reduce power consumption of wireless sensor terminals. FIG. 11 is a diagram illustrating a communication system that employs conventional intermittent reception. As shown in FIG. 11, in the communication system employing the conventional intermittent reception, the power supply of the receiving circuit is periodically switched on (T time in the figure is one cycle), and when the switch is on. When the radio wave is transmitted from the other party, the switch ON state is continued and the demodulation operation is performed (A section in the figure). Further, the power source of the receiving circuit is turned off when radio waves are not transmitted from the other party, and waits for the next cycle to save power (B section in the figure).

また、中継器は、無線センサ端末の検出器がデータを検出すると無線センサ端末が送信した信号により間欠受信状態から復帰する。なお、基地局と中継器と無線センサ端末は、同期を取ることで、無線センサ端末の時刻情報が無線センサ端末の検出器が検出したデータに付加される。更に、この無線センサ端末の時刻情報は、基地局から送信される信号や他の無線端末により修正される。   In addition, when the detector of the wireless sensor terminal detects data, the repeater returns from the intermittent reception state by a signal transmitted by the wireless sensor terminal. The base station, the repeater, and the wireless sensor terminal are synchronized so that time information of the wireless sensor terminal is added to data detected by the detector of the wireless sensor terminal. Further, the time information of the wireless sensor terminal is corrected by a signal transmitted from the base station or another wireless terminal.

なお、無線センサ端末にＧＰＳモジュールを内蔵し、時刻の修正に用いる方法が特許文献１に開示されている。   A method of incorporating a GPS module in a wireless sensor terminal and using it to correct time is disclosed in Patent Document 1.

特開２００１−１１６８２１号公報JP 2001-116821 A

上述した間欠受信を採用する通信システムの場合は、中継器の受信回路の電源を周期的にスイッチＯＮ状態にしているので、スイッチＯＮ状態の間は電力が消費されるという問題点があった。また、無線センサ端末の時刻情報を修正する場合も中継器の送受信回路が起動し、電力が消費される。中継器は、通信システム上では無線センサ端末より長時間駆動させる必要があり、この電力消費が無視できないレベルであるという問題点があった。   In the case of the above-described communication system employing intermittent reception, the power supply of the receiving circuit of the repeater is periodically switched on, so that power is consumed while the switch is on. Also, when correcting the time information of the wireless sensor terminal, the transmission / reception circuit of the repeater is activated and power is consumed. The repeater needs to be driven for a longer time than the wireless sensor terminal on the communication system, and there is a problem that this power consumption is at a level that cannot be ignored.

更に、上述の時刻情報の付加方法は、基地局と無線センサ端末の通信に中継器を介しているので、通信距離や信号処理に依存した時間遅延要因により時刻情報に誤差が生じるという問題点があった。   Furthermore, since the time information addition method described above uses a repeater for communication between the base station and the wireless sensor terminal, there is a problem that an error occurs in the time information due to a time delay factor depending on the communication distance and signal processing. there were.

また、特許文献１のように時刻情報の取得にＧＰＳ（ＧＰＳ：Global Positioning System）を用いる場合は、ＧＰＳモジュールを装着すると消費電力が高くなるという問題点があった。更に、コストが高いので、無線センサ端末を大量に必要とする通信システムにＧＰＳを採用するのは困難であるという問題点があった。また、ＧＰＳは見通しの悪い環境条件下や室内では使えないという問題点があった。   Moreover, when using GPS (GPS: Global Positioning System) for acquisition of time information like patent document 1, there existed a problem that power consumption will become high if a GPS module is mounted | worn. Further, since the cost is high, there is a problem that it is difficult to adopt GPS in a communication system that requires a large number of wireless sensor terminals. In addition, GPS has a problem that it cannot be used indoors with poor visibility or indoors.

本発明は、上述した問題点を解決すべくなされたもので、その技術課題は、低消費電力で、時刻情報の精度が高く、環境条件に影響を受けにくい無線通信システムを提供することである。   The present invention has been made to solve the above-mentioned problems, and a technical problem thereof is to provide a wireless communication system that has low power consumption, high accuracy of time information, and is hardly affected by environmental conditions. .

上記目的を達成するための第１の発明は、ホスト装置に有線回線を用いて接続可能な基地局と中継機能を有する中継器と検出器を有する無線センサ端末との間で無線通信を行う無線通信システムにおいて、標準電波を受信する受信手段と、時刻情報や検出データの送受信のための送受信回路手段と、送受信を行う時刻と検出器のデータとを記憶する記憶部とメモリに記憶されたプログラムを実行するＣＰＵ部と前記記憶部のデータと前記時計手段のデータにより送受信を制御する送受信制御部と前記記憶部のデータと前記時計手段のデータにより前記送受信回路への電力供給を制御する電源制御部からなる制御手段とを前記基地局又は前記中継器又は前記無線センサ端末に備えた無線通信システムである。   According to a first aspect of the present invention for achieving the above object, wireless communication is performed between a base station connectable to a host device using a wired line, a repeater having a relay function, and a wireless sensor terminal having a detector. In a communication system, receiving means for receiving standard radio waves, transmitting / receiving circuit means for transmitting / receiving time information and detection data, a storage unit for storing transmission / reception time and detector data, and a program stored in the memory Power control for controlling power supply to the transmission / reception circuit by data of the storage unit, data of the storage unit, and data of the clock unit A wireless communication system including a control unit including a unit in the base station, the repeater, or the wireless sensor terminal.

上記目的を達成するための第２の発明は、前記受信手段により時刻修正を行う手段を前記基地局及び前記中継器及び前記無線センサ端末に備えた無線通信システムである。   A second invention for achieving the above object is a wireless communication system in which means for adjusting the time by the receiving means is provided in the base station, the repeater, and the wireless sensor terminal.

上記目的を達成するための第３の発明は、前記時計手段の標準時刻情報を基にした検出時の時刻情報を前記無線センサ端末の検出したデータに付加した情報を送信する手段を前記無線センサ端末に備えた無線通信システムである。   According to a third aspect of the invention for achieving the above object, the wireless sensor includes means for transmitting information in which time information at the time of detection based on standard time information of the clock means is added to data detected by the wireless sensor terminal. It is the radio | wireless communications system with which the terminal was equipped.

上記目的を達成するための第４の発明は、前記中継器は、前記基地局が送信する前記基地局の前記記憶部のデータを前記中継器の前記記憶部に記憶し、前記無線センサ端末は、前記中継器が送信する前記中継器の前記記憶部のデータを前記無線センサ端末の前記記憶部に記憶し、前記基地局又は前記中継器又は前記無線センサ端末の前記送受信制御部は、前記記憶部のデータを参照して、前記時計手段の標準時刻情報により送受信を開始する機能を備えた無線通信システムである。   According to a fourth aspect of the invention for achieving the above object, the repeater stores data in the storage unit of the base station transmitted by the base station in the storage unit of the repeater, and the wireless sensor terminal The data of the storage unit of the repeater transmitted by the repeater is stored in the storage unit of the wireless sensor terminal, and the transmission / reception control unit of the base station, the repeater, or the wireless sensor terminal is stored in the storage unit. This is a wireless communication system having a function of starting transmission / reception according to the standard time information of the clock means with reference to the data of the section.

上記目的を達成するための第５の発明は、前記標準時刻情報に基づき前記基地局と前記中継器と前記無線センサ端末との間の時刻同期を行う手段を前記基地局又は前記中継器又は前記無線センサ端末に備え、前記電源制御部は前記標準時刻情報と前記記憶部のデータを参照し、送受信時刻まで前記送受信回路を停止させ、前記送受信時刻に前記送受信回路を起動させ、前記送受信が終了後に前記送受信回路を再び停止させる機能を備えた無線通信システムである。   According to a fifth aspect of the invention for achieving the above object, means for performing time synchronization between the base station, the repeater, and the wireless sensor terminal based on the standard time information includes the base station, the repeater, or the In the wireless sensor terminal, the power control unit refers to the standard time information and the data in the storage unit, stops the transmission / reception circuit until the transmission / reception time, starts the transmission / reception circuit at the transmission / reception time, and completes the transmission / reception A wireless communication system having a function of stopping the transmission / reception circuit again later.

本発明によれば、ホスト装置に有線回線を用いて接続可能な基地局と中継機能を有する中継器と検出器を有する無線センサ端末との間で無線通信を行う無線通信システムにおいて、基地局、中継器、無線センサ端末が独立した時刻同期機能を備えることで、無線センサ端末は、標準電波により無線センサ端末の時刻を修正できるので、無線センサ端末の時刻情報修正時に中継器の送受信に要する電力を省力化できる。   According to the present invention, in a wireless communication system that performs wireless communication between a base station connectable to a host device using a wired line, a repeater having a relay function, and a wireless sensor terminal having a detector, the base station, Since the repeater and the wireless sensor terminal have an independent time synchronization function, the wireless sensor terminal can correct the time of the wireless sensor terminal using the standard radio wave, so the power required for transmission and reception of the repeater when correcting the time information of the wireless sensor terminal Can save labor.

また、無線センサ端末が直接標準電波を受信して無線センサ端末の時刻修正を行うので、無線センサ端末を経由して時刻を修正する場合の距離による遅延や情報処理による遅延を防止できる。更に、この標準電波を受信するモジュールは、ＧＰＳのモジュールと比較してコストや消費電力の面で優れ、ＧＰＳよりも地形による影響を受けにくいという利点がある。   In addition, since the wireless sensor terminal directly receives the standard radio wave and corrects the time of the wireless sensor terminal, it is possible to prevent delay due to distance and delay due to information processing when the time is corrected via the wireless sensor terminal. Further, the module that receives the standard radio wave is advantageous in terms of cost and power consumption as compared with the GPS module, and has an advantage that it is less affected by the terrain than GPS.

更に、基地局及び中継器及び無線センサ端末が、標準電波を用いた高い精度で時刻同期をさせた上で、あらかじめ送受信の開始時刻を決め、送受信の開始時刻に従って送受信回路を起動させ、送受信を終えると送受信回路を停止させる機能を備えているので、送受信の開始時刻が決まり、無線通信センサ端末を間欠受信状態で待機させる必要がなく、間欠受信状態で待機させるのに要する電力をなくすことができる。また、高い精度で時刻同期しているので、各端末の送受信回路の起動時間を最低限に抑制できる。   Furthermore, the base station, repeater, and wireless sensor terminal synchronize the time with high accuracy using standard radio waves, determine the transmission / reception start time in advance, activate the transmission / reception circuit according to the transmission / reception start time, and perform transmission / reception. Since it has a function to stop the transmission / reception circuit when it is finished, the start time of transmission / reception is determined, and there is no need to wait for the wireless communication sensor terminal in the intermittent reception state, and the power required to wait in the intermittent reception state can be eliminated it can. In addition, since time synchronization is performed with high accuracy, the activation time of the transmission / reception circuit of each terminal can be minimized.

その結果、低消費電力で、時刻情報の精度が高く、環境条件に影響を受けにくい無線通信システムの提供が可能になる。   As a result, it is possible to provide a wireless communication system with low power consumption, high accuracy of time information, and less susceptible to environmental conditions.

本発明を実施するための最良の形態に係る無線通信システムを以下に図面を参照して詳細に説明する。   A wireless communication system according to the best mode for carrying out the present invention will be described below in detail with reference to the drawings.

図１は、本発明の無線通信システムにおける基地局の構成を示すブロック図である。図２は、本発明の無線通信システムにおける中継器の構成を示すブロック図である。図３は、本発明の無線通信システムにおける無線センサ端末の構成を示すブロック図である。図４は、図１の基地局における送受信時刻データ送信処理時の動作を示すフローチャートである。図５は、図２の中継器における送受信時刻データ送受信処理時の動作を示すフローチャートである。図６は、図３の無線センサ端末における送受信時刻データ受信処理時の動作を示すフローチャートである。図７は、図３の無線センサ端末における検出データ送信処理時の動作を示すフローチャートである。図８は、図２の中継器における検出データ送受信処理時の動作を示すフローチャートである。図９は、図１の基地局における検出データ受信処理時の動作を示すフローチャートである。図１０は、本発明による省電力性能を従来の間欠受信との比較で示す図である。   FIG. 1 is a block diagram showing a configuration of a base station in the wireless communication system of the present invention. FIG. 2 is a block diagram showing the configuration of the repeater in the wireless communication system of the present invention. FIG. 3 is a block diagram showing a configuration of a wireless sensor terminal in the wireless communication system of the present invention. FIG. 4 is a flowchart showing an operation at the time of transmission / reception time data transmission processing in the base station of FIG. FIG. 5 is a flowchart showing an operation during transmission / reception time data transmission / reception processing in the repeater of FIG. FIG. 6 is a flowchart showing an operation at the time of reception / transmission time data reception processing in the wireless sensor terminal of FIG. FIG. 7 is a flowchart showing an operation during detection data transmission processing in the wireless sensor terminal of FIG. FIG. 8 is a flowchart showing an operation during detection data transmission / reception processing in the repeater of FIG. FIG. 9 is a flowchart showing the operation during detection data reception processing in the base station of FIG. FIG. 10 is a diagram showing the power saving performance according to the present invention in comparison with the conventional intermittent reception.

図１に示されるように、基地局１は、送受信回路４と制御部５と時計６とアンテナ７とアンテナ８とから構成される。制御部５は、ＣＰＵ１０と記憶部１１と送受信制御部１２と電源制御部１３とからなる。記憶部１１には、送受信の時刻情報や検出データが記憶される。   As shown in FIG. 1, the base station 1 includes a transmission / reception circuit 4, a control unit 5, a clock 6, an antenna 7, and an antenna 8. The control unit 5 includes a CPU 10, a storage unit 11, a transmission / reception control unit 12, and a power supply control unit 13. The storage unit 11 stores transmission / reception time information and detection data.

図２に示されるように、中継器２は、送受信回路４と、制御部５と時計６とアンテナ７とアンテナ８とから構成される。制御部５は、ＣＰＵ１０と記憶部１１と送受信制御部１２と電源制御部１３とからなる。記憶部１１には、送受信の時刻情報や検出データが記憶される。   As shown in FIG. 2, the repeater 2 includes a transmission / reception circuit 4, a control unit 5, a clock 6, an antenna 7, and an antenna 8. The control unit 5 includes a CPU 10, a storage unit 11, a transmission / reception control unit 12, and a power supply control unit 13. The storage unit 11 stores transmission / reception time information and detection data.

図３に示されるように、無線センサ端末３は、送受信回路４と制御部５と時計６とアンテナ７とアンテナ８と検出器９とから構成される。制御部５は、ＣＰＵ１０と記憶部１１と送受信制御部１２と電源制御部１３とからなる。記憶部１１には、送受信の時刻情報や検出データが記憶される。   As shown in FIG. 3, the wireless sensor terminal 3 includes a transmission / reception circuit 4, a control unit 5, a clock 6, an antenna 7, an antenna 8, and a detector 9. The control unit 5 includes a CPU 10, a storage unit 11, a transmission / reception control unit 12, and a power supply control unit 13. The storage unit 11 stores transmission / reception time information and detection data.

本発明の無線通信システムの動作について図４〜図１０に従って以下に説明する。本発明の無線通信システムでは、送受信時刻の決定とそれに従った検出データの送受信とを行っている。これらの動作について、順を追って説明する。   The operation of the wireless communication system of the present invention will be described below with reference to FIGS. In the wireless communication system of the present invention, transmission / reception time is determined and detection data is transmitted / received accordingly. These operations will be described step by step.

最初に、送受信時刻の決定について説明する。図１、図４に示されるように、基地局１が送受信時刻のデータを送信する際は、記憶部１１の送受信時刻データに従い、新しい送受信時刻データの送信時刻まで時計６を標準電波で時刻修正しながら待機する（図４ステップＳ１１〜１３）。このステップでは、ネットワーク立ち上げ時の送受信時刻データが記憶部１１にない場合は、すぐに送受信時刻データの送受信準備に入る（図４ステップＳ１１）。送信時刻になると、記憶部１１に新しい送受信時刻データを記憶し（図４ステップＳ１３）、送受信回路４を起動させて送受信時刻データを中継器に送信し、再び送受信回路４を停止させる（図４ステップＳ１４〜１６）。   First, determination of transmission / reception time will be described. As shown in FIGS. 1 and 4, when the base station 1 transmits the transmission / reception time data, the time of the clock 6 is adjusted with the standard radio wave until the transmission time of the new transmission / reception time data according to the transmission / reception time data of the storage unit 11. While waiting (steps S11 to 13 in FIG. 4). In this step, if the transmission / reception time data at the time of starting the network is not stored in the storage unit 11, the transmission / reception time data is immediately prepared for transmission / reception (step S11 in FIG. 4). When the transmission time is reached, new transmission / reception time data is stored in the storage unit 11 (step S13 in FIG. 4), the transmission / reception circuit 4 is activated, the transmission / reception time data is transmitted to the repeater, and the transmission / reception circuit 4 is stopped again (FIG. 4). Steps S14 to 16).

次に、図２、図５に示されるように、中継器２が送受信時刻のデータを送受信する際は、記憶部１１の送受信時刻データに従い、新しい送受信時刻データの送受信時刻まで時計６を標準電波で時刻修正しながら待機する（図５ステップＳ２１〜２３）。このステップでは、ネットワーク立ち上げ時の送受信時刻データが記憶部１１にない場合は、すぐに送受信時刻データの送信準備に入る（図５ステップＳ２１）。送受信時刻になると、送受信回路４を起動させて基地局１から送られてくる送受信時刻データを受信して記憶部１１に記憶し（図５ステップＳ２３〜２６）、そのデータを無線センサ端末に送信し、再び送受信回路４を停止させる（図５ステップＳ２７）。   Next, as shown in FIG. 2 and FIG. 5, when the repeater 2 transmits / receives transmission / reception time data, the standard radio wave is transmitted to the clock 6 until the transmission / reception time of the new transmission / reception time data according to the transmission / reception time data of the storage unit 11. To wait while correcting the time (steps S21 to 23 in FIG. 5). In this step, when the transmission / reception time data at the time of starting the network is not in the storage unit 11, the transmission / reception time data is immediately prepared for transmission (step S21 in FIG. 5). When the transmission / reception time is reached, the transmission / reception circuit 4 is activated to receive the transmission / reception time data transmitted from the base station 1 and store it in the storage unit 11 (steps S23 to S26 in FIG. 5), and transmit the data to the wireless sensor terminal. Then, the transmission / reception circuit 4 is stopped again (step S27 in FIG. 5).

また、図３、図６に示されるように、無線センサ端末３が送受信時刻のデータを受信する際は、記憶部１１の送受信時刻データに従い、新しい送受信時刻データの受信時刻まで時計６を標準電波で時刻修正しながら待機する（図６ステップＳ３１〜３３）。このステップでは、ネットワーク立ち上げ時の送受信時刻データが記憶部１１にない場合は、すぐに送受信時刻データの受信準備に入る（図６ステップＳ３１）。受信時刻になると、送受信回路４を起動させて中継器から送られてくる送受信時刻データを受信して記憶部１１に記憶し、再び送受信回路４を停止させる（図６ステップＳ３４〜３６）。   As shown in FIGS. 3 and 6, when the wireless sensor terminal 3 receives transmission / reception time data, the watch 6 is set to the standard radio wave until the new transmission / reception time data reception time according to the transmission / reception time data in the storage unit 11. To wait while correcting the time (steps S31 to 33 in FIG. 6). In this step, if the transmission / reception time data at the time of starting up the network is not in the storage unit 11, the transmission / reception time data is immediately prepared for reception (step S31 in FIG. 6). When the reception time is reached, the transmission / reception circuit 4 is activated to receive the transmission / reception time data sent from the repeater, store it in the storage unit 11, and stop the transmission / reception circuit 4 again (steps S34 to 36 in FIG. 6).

次に、検出データの送受信について説明する。図３、図７に示されるように、無線センサ端末３は、記憶部１１の送受信時刻データに従い、検出データの送信時刻まで時計６を標準電波で時刻修正しながら、検出器９から検出されたデータに時計６の標準時刻情報を付加して、記憶部１１に保存していく（図７ステップＳ４１〜４３）。送信時刻になると、送受信回路４を起動させて記憶部１１内に保存したデータを中継器２に送信し、再び送受信回路４を停止させる（図７ステップＳ４４、Ｓ４５）。   Next, transmission and reception of detection data will be described. As shown in FIGS. 3 and 7, the wireless sensor terminal 3 is detected from the detector 9 in accordance with the transmission / reception time data of the storage unit 11 while correcting the time of the clock 6 with the standard radio wave until the transmission time of the detection data. The standard time information of the clock 6 is added to the data and stored in the storage unit 11 (steps S41 to S43 in FIG. 7). When the transmission time is reached, the transmission / reception circuit 4 is activated to transmit the data stored in the storage unit 11 to the repeater 2, and the transmission / reception circuit 4 is stopped again (steps S44 and S45 in FIG. 7).

また、図２、図８に示されるように、中継器２は、記憶部１１の送受信時刻データに従い、検出データの送信時刻まで時計６を標準電波で時刻修正しながら待機する（図８ステップＳ５１、Ｓ５２）。送受信時刻になると、送受信回路４を起動させて無線センサ端末３から送られてくる検出データを記憶部１１に記憶し、そのデータを基地局１に送信し、再び送受信回路４を停止させる（図８ステップＳ５３〜５５）。   As shown in FIGS. 2 and 8, the repeater 2 waits while adjusting the time of the clock 6 with the standard radio wave until the transmission time of the detection data according to the transmission / reception time data of the storage unit 11 (step S51 in FIG. 8). , S52). When the transmission / reception time is reached, the transmission / reception circuit 4 is activated, the detection data transmitted from the wireless sensor terminal 3 is stored in the storage unit 11, the data is transmitted to the base station 1, and the transmission / reception circuit 4 is stopped again (see FIG. 8 steps S53-55).

更に、図１、図９に示されるように、基地局１は、記憶部１１の送受信時刻データに従い、検出データの送信時刻まで時計６を標準電波で時刻修正しながら待機する（図９ステップＳ６１〜６２）。受信時刻になると、送受信回路４を起動させて中継器２から送られてくる検出データを記憶部１１に記憶し、再び送受信回路４を停止させる（図９ステップＳ６３、Ｓ６４）。   Further, as shown in FIG. 1 and FIG. 9, the base station 1 waits while adjusting the time of the clock 6 with the standard radio wave until the transmission time of the detection data according to the transmission / reception time data in the storage unit 11 (step S61 in FIG. 9). ~ 62). When the reception time is reached, the transmission / reception circuit 4 is activated, the detection data sent from the repeater 2 is stored in the storage unit 11, and the transmission / reception circuit 4 is stopped again (steps S63 and S64 in FIG. 9).

以上のように、本発明を実施するための最良の形態では、中継を行わずに独立して基地局、中継器、無線センサ端末が時刻同期を行うので、中継器のデータ中継に必要な消費電力を削減できる。   As described above, in the best mode for carrying out the present invention, the base station, the repeater, and the wireless sensor terminal perform time synchronization independently without relaying, so that the consumption required for data relay of the repeater Electric power can be reduced.

更に、無線センサ端末からの検出データは、送信時刻に基づいて送られるので、データの送受信時刻以外は中継器の送受信回路を停止させることで従来の間欠受信の状態で待機させるのに要する電力を削減できる（図１、図１０を参照）。   Furthermore, since the detection data from the wireless sensor terminal is sent based on the transmission time, the power required to wait in the conventional intermittent reception state by stopping the transmission / reception circuit of the repeater except for the data transmission / reception time. (See FIGS. 1 and 10).

また、標準時刻を用いて端末間の送受信を制御することで、時間遅延などに消費する無駄な電力を最小限に抑制できる。更に、中継部分である中継器の省電力化により、ネットワーク全体の無線通信システムの寿命を延ばすことができる。   Further, by controlling transmission / reception between terminals using the standard time, wasteful power consumed for time delay or the like can be minimized. Furthermore, the life of the wireless communication system of the entire network can be extended by reducing the power consumption of the repeater, which is a relay part.

また、無線センサ端末の検出データに時刻情報を付加する際は、中継せずに直接受信した標準電波で時刻修正した時計の時刻を用いるので、時刻情報の精度の高い検出データを得ることができる。   In addition, when adding time information to the detection data of the wireless sensor terminal, since the time of a clock whose time is corrected with a standard radio wave directly received without relaying is used, detection data with high accuracy of time information can be obtained. .

以上に示したように、本発明により低消費電力で、時刻情報の精度が高く、環境条件に影響を受けにくい無線通信システムの提供が可能になる。   As described above, according to the present invention, it is possible to provide a wireless communication system with low power consumption, high accuracy of time information, and hardly affected by environmental conditions.

本発明の無線通信システムにおける基地局の構成を示すブロック図The block diagram which shows the structure of the base station in the radio | wireless communications system of this invention 本発明の無線通信システムにおける中継器の構成を示すブロック図。The block diagram which shows the structure of the repeater in the radio | wireless communications system of this invention. 本発明の無線通信システムにおける無線センサ端末の構成を示すブロック図。The block diagram which shows the structure of the wireless sensor terminal in the wireless communication system of this invention. 図１の基地局における送受信時刻データ送信処理時の動作を示すフローチャート。The flowchart which shows the operation | movement at the time of the transmission / reception time data transmission process in the base station of FIG. 図２の中継器における送受信時刻データ送受信処理時の動作を示すフローチャート。The flowchart which shows the operation | movement at the time of the transmission / reception time data transmission / reception process in the repeater of FIG. 図３の無線センサ端末における送受信時刻データ受信処理時の動作を示すフローチャート。The flowchart which shows the operation | movement at the time of the transmission / reception time data reception process in the wireless sensor terminal of FIG. 図３の無線センサ端末における検出データ送信処理時の動作を示すフローチャート。The flowchart which shows the operation | movement at the time of the detection data transmission process in the wireless sensor terminal of FIG. 図２の中継器における検出データ送受信処理時の動作を示すフローチャート。The flowchart which shows the operation | movement at the time of the detection data transmission / reception process in the repeater of FIG. 図１の基地局における検出データ受信処理時の動作を示すフローチャート。The flowchart which shows the operation | movement at the time of the detection data reception process in the base station of FIG. 本発明による省電力性能を従来の間欠受信との比較で示す図。The figure which shows the power saving performance by this invention by the comparison with the conventional intermittent reception. 従来の間欠受信を採用する通信システムを説明する図。The figure explaining the communication system which employ | adopts the conventional intermittent reception.

符号の説明Explanation of symbols

１ 基地局
２ 中継器
３ 無線センサ端末
４ 送受信回路
５ 制御部
６ 時計
７ アンテナ
８ アンテナ
９ 検出器
１０ ＣＰＵ
１１ 記憶部
１２ 送受信制御部
１３ 電源制御部
１４ 有線回線 DESCRIPTION OF SYMBOLS 1 Base station 2 Repeater 3 Wireless sensor terminal 4 Transmission / reception circuit 5 Control part 6 Clock 7 Antenna 8 Antenna 9 Detector 10 CPU
11 Storage Unit 12 Transmission / Reception Control Unit 13 Power Supply Control Unit 14 Wired Line

Claims (5)

ホスト装置に有線回線を用いて接続可能な基地局と中継機能を有する中継器と検出器を有する無線センサ端末との間で無線通信を行う無線通信システムにおいて、標準電波を受信する受信手段と、時刻情報や検出データの送受信のための送受信回路手段と、送受信を行う時刻と検出器のデータとを記憶する記憶部とメモリに記憶されたプログラムを実行するＣＰＵ部と前記記憶部のデータと前記時計手段のデータにより送受信を制御する送受信制御部と前記記憶部のデータと前記時計手段のデータにより前記送受信回路への電力供給を制御する電源制御部からなる制御手段とを前記基地局又は前記中継器又は前記無線センサ端末に備えたことを特徴とする無線通信システム。   In a wireless communication system that performs wireless communication between a base station that can be connected to a host device using a wired line, a repeater having a relay function, and a wireless sensor terminal having a detector, a receiving unit that receives a standard radio wave; Transmission / reception circuit means for transmission / reception of time information and detection data, a storage unit for storing transmission / reception time and detector data, a CPU unit for executing a program stored in the memory, data in the storage unit, and The base station or the relay includes: a transmission / reception control unit that controls transmission / reception by data of a clock unit; a control unit that includes data of the storage unit; and a power supply control unit that controls power supply to the transmission / reception circuit by data of the clock unit Or a wireless communication terminal provided in the wireless sensor terminal. 前記受信手段により時刻修正を行う手段を前記基地局及び前記中継器及び前記無線センサ端末に備えたことを特徴とする請求項１記載の無線通信システム。   2. The wireless communication system according to claim 1, wherein means for adjusting the time by the receiving means is provided in the base station, the repeater and the wireless sensor terminal. 前記時計手段の標準時刻情報を基にした検出時の時刻情報を前記無線センサ端末の検出したデータに付加した情報を送信する手段を前記無線センサ端末に備えたことを特徴とする請求項２記載の無線通信システム。   3. The wireless sensor terminal is provided with means for transmitting information in which time information at the time of detection based on standard time information of the clock means is added to data detected by the wireless sensor terminal. Wireless communication system. 前記中継器は、前記基地局が送信する前記基地局の前記記憶部のデータを前記中継器の前記記憶部に記憶し、前記無線センサ端末は、前記中継器が送信する前記中継器の前記記憶部のデータを前記無線センサ端末の前記記憶部に記憶し、前記基地局又は前記中継器又は前記無線センサ端末の前記送受信制御部は、前記記憶部のデータを参照して、前記時計手段の標準時刻情報により送受信を開始する機能を備えたことを特徴とする請求項３記載の無線通信システム。   The repeater stores data in the storage unit of the base station transmitted by the base station in the storage unit of the repeater, and the wireless sensor terminal stores the memory of the repeater transmitted by the repeater. Unit data is stored in the storage unit of the wireless sensor terminal, and the transmission / reception control unit of the base station or the repeater or the wireless sensor terminal refers to the data of the storage unit to The wireless communication system according to claim 3, further comprising a function of starting transmission / reception based on time information. 前記標準時刻情報に基づき前記基地局と前記中継器と前記無線センサ端末との間の時刻同期を行う手段を前記基地局又は前記中継器又は前記無線センサ端末に備え、前記電源制御部は前記標準時刻情報と前記記憶部のデータを参照し、送受信時刻まで前記送受信回路を停止させ、前記送受信時刻に前記送受信回路を起動させ、前記送受信が終了後に前記送受信回路を再び停止させる機能を備えたことを特徴とする請求項３記載の無線通信システム。   The base station, the repeater, or the wireless sensor terminal includes means for performing time synchronization between the base station, the repeater, and the wireless sensor terminal based on the standard time information, and the power supply control unit includes the standard A function of referring to time information and data in the storage unit, stopping the transmission / reception circuit until the transmission / reception time, starting the transmission / reception circuit at the transmission / reception time, and stopping the transmission / reception circuit again after the transmission / reception ends; The wireless communication system according to claim 3.
JP2006052251A 2006-02-28 2006-02-28 Radio communication system Pending JP2007235344A (en)

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