JP2008028499A - Remote monitoring communication system - Google Patents
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- JP2008028499A JP2008028499A JP2006196414A JP2006196414A JP2008028499A JP 2008028499 A JP2008028499 A JP 2008028499A JP 2006196414 A JP2006196414 A JP 2006196414A JP 2006196414 A JP2006196414 A JP 2006196414A JP 2008028499 A JP2008028499 A JP 2008028499A
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本発明は、無線が直接届かない無線端末同士においても他無線端末を介して通信が可能なアドホックネットワークを形成する複数台の無線端末と基地局、またインターネットを介した監視部との無線通信システム及び無線端末に係り、特に、基地局または監視部から無線端末に送信される制御情報を用いた通信システムに関する。 The present invention relates to a wireless communication system between a plurality of wireless terminals and a base station, or a monitoring unit via the Internet, which form an ad hoc network in which wireless terminals that do not directly receive wireless communication can communicate with each other via other wireless terminals. In particular, the present invention relates to a communication system using control information transmitted from a base station or a monitoring unit to the wireless terminal.
一般的にアドホックネットワークの場合、無線が直接届かない無線端末同士においても他無線端末を介して通信が可能なネットワークであるから、間欠動作を行う場合はネットワーク内で複数の無線端末同士が間欠動作を同期させる必要がある。
また、センサネットワークに代表されるセンサ付無線端末は、その使用上、多くの場合において電池起動や太陽電池起動を前提としており、低消費電力化は必須技術である。そのため、低消費電力化の手段として間欠動作を行う場合が多い。間欠送信するようにした無線装置の例が特許文献1に開示されている。
In general, in the case of an ad hoc network, even if wireless terminals that do not reach the radio directly can communicate with each other via other wireless terminals, when performing intermittent operation, multiple wireless terminals operate intermittently within the network. Need to be synchronized.
In addition, in many cases, wireless terminals with sensors typified by sensor networks are premised on battery activation and solar cell activation, and low power consumption is an essential technology. Therefore, intermittent operation is often performed as a means for reducing power consumption. An example of a wireless device that performs intermittent transmission is disclosed in Patent Document 1.
しかしながら、動作状態の期間や間欠時間周期が固定されている場合は、通信トラフィック量が少ない場合、無線端末は無駄に受信状態が続いてしまい低消費電力化の妨げとなる。また、反対に通信トラフィック量が多い場合、全ての通信が完了する前に動作状態から睡眠状態に遷移する時刻に達してしまう恐れがある。
また、アドホックネットワークで間欠動作を行う場合は、無線端末の起動時間ばらつき起因のアドホックネットワーク再構築時間遅延による消費電力増加や、これら起動時間ばらつきの累積による無線端末の同期はずれ起因の無線端末起動不全によるセンサデバイス等の制御およびデータ収集不全という遠隔監視通信システムとしての信頼性が低下する恐れがある。
However, when the period of the operation state and the intermittent time period are fixed, if the amount of communication traffic is small, the wireless terminal is unnecessarily kept in the reception state, which hinders low power consumption. On the other hand, when the amount of communication traffic is large, there is a possibility that the time for transition from the operating state to the sleeping state may be reached before all communication is completed.
In addition, when intermittent operation is performed in an ad hoc network, power consumption increases due to delays in the reconfiguration time of the ad hoc network due to variations in the activation time of the wireless terminals, and wireless terminal activation failure due to out of synchronization of the wireless terminals due to accumulation of these activation time variations There is a risk that the reliability of the remote monitoring communication system such as the control of the sensor device or the like and the data collection failure due to the decrease in reliability.
また、無線端末に開閉装置や照明装置などを接続することにより基地局または監視部から無線端末を遠隔操作することも考えられる。この際、間欠時間周期により基地局または監視部から無線端末に伝達される制御情報の伝達時間が依存する。すなわち間欠時間周期が長いほど消費電力の点で有利になるが制御情報の伝達時間は長くなり、反対に間欠時間周期が短いほど消費電力の点で不利になるが制御情報の伝達時間は短縮される。 It is also conceivable to remotely operate the wireless terminal from a base station or a monitoring unit by connecting an opening / closing device, a lighting device, etc. to the wireless terminal. At this time, the transmission time of the control information transmitted from the base station or the monitoring unit to the wireless terminal depends on the intermittent time period. In other words, the longer the intermittent time period, the more advantageous in terms of power consumption, but the longer the transmission time of control information, and the shorter the intermittent time period, the more disadvantageous in terms of power consumption, but the transmission time of control information is shortened. The
本発明の目的は、基地局または監視部が無線端末からの無線端末付帯のセンサデバイス等の制御およびデータ収集のためのデータ送受信が完了したかを基地局または監視部と無線端末間でのデータ送受信にともなう通信トラフィック量やデータ交信時間帯やセンサ情報や前記監視部に蓄積された制御情報を基に判断し、無線端末に対して制御情報と時間同期情報を一斉通報することにより、無線端末の低消費電力化と無線端末同士の間欠操作の同期化を図ると共に、小さいデータ伝達時間を実現する遠隔監視通信システムを提供することにある。 The object of the present invention is to determine whether the base station or monitoring unit has completed data transmission / reception for control and data collection of a wireless terminal-attached sensor device and the like between the base station or monitoring unit and the wireless terminal. By determining the amount of communication traffic associated with transmission / reception, data communication time zone, sensor information, and control information stored in the monitoring unit, and simultaneously reporting control information and time synchronization information to the wireless terminal, the wireless terminal It is intended to provide a remote monitoring communication system that achieves a low data transmission time while achieving low power consumption and synchronization of intermittent operations between wireless terminals.
上記目的を達成するための本発明の遠隔監視線通信システムは、基地局または監視部が無線端末からの無線端末付帯のセンサデバイス等の制御およびデータ収集のためのデータ送受信が完了したかを基地局または監視部と無線端端末間でのデータ送受信にともなう通信トラフィック量やデータ交信時間帯やセンサ情報や前記監視部に蓄積された制御情報を基に判断し、無線端末に対して制御情報と時間同期情報を一斉通報することにより、無線端末の動作状態の期間や間欠時間周期など間欠動作に関する項目を適応的に制御することを特徴とする。 In order to achieve the above object, the remote supervisory line communication system of the present invention is based on whether the base station or the monitoring unit has completed transmission / reception of data for the control and data collection of the sensor device attached to the wireless terminal from the wireless terminal. Judgment is based on the amount of communication traffic, data communication time zone, sensor information, and control information stored in the monitoring unit associated with data transmission / reception between the station or monitoring unit and the wireless terminal, It is characterized by adaptively controlling items related to intermittent operation such as the period of operation of the wireless terminal and the intermittent time period by simultaneously reporting the time synchronization information.
無線端末は商用電源が取れない場所で使用することを前提としており、電池や太陽電池などを用いて無線端末を起動することが想定される。また無線端末は、例えば人体に取り付けて使用する場合なども考えられるため可能な限り小型である方がよいが、電池や太陽電池が占める体積が重要な問題となる。従って、上記無線端末は低消費電力化・小型化を実現するために、定期的に起動し基地局間でのデータ送受信しその後再び休止待ち受け状態に遷移する間欠動作を繰り返す手段が採用されている。
一般的にアドホックネットワークの場合、無線が直接届かない無線端末同士においも他無線端末を介して通信が可能なネットワークであるから、無線端末同士で間欠動作の同期が外れた場合、起動時間ばらつき起因のアドホックネットワーク再構築時間遅延による消費電力増加や、これら起動時間ばらつきの累積による無線端末の同期はずれ起因の無線端末起動不全によるセンサデバイス等の制御およびデータ収集不全という遠隔監視通信システムとしての信頼性低下を引き起こす。
The wireless terminal is assumed to be used in a place where commercial power cannot be taken, and it is assumed that the wireless terminal is activated using a battery or a solar battery. In addition, since the wireless terminal can be used by being attached to a human body, for example, it is better to be as small as possible. However, the volume occupied by the battery or the solar battery becomes an important problem. Therefore, in order to realize low power consumption and downsizing, the wireless terminal employs means for periodically starting, transmitting and receiving data between base stations, and then repeating an intermittent operation of transitioning to a standby state again. .
In general, in the case of an ad hoc network, wireless terminals that cannot communicate directly with each other can communicate with each other via other wireless terminals. Increased power consumption due to delays in ad hoc network reconfiguration, and reliability as a remote monitoring communication system such as sensor device control and data collection failure due to wireless terminal activation failure due to synchronization failure of wireless terminals due to accumulation of activation time variations Causes a drop.
無線端末が休止待ち受け状態である時間帯は、基地局または監視部と無線端末の通信は一切不可能となる。したがって基地局または監視部から無線端末に送信される制御情報や無線端末から基地局または監視部に送信されるセンサ情報が伝達されるのに、無線端末が動作状態に遷移することによりアドホックセットワークが立ち上がるまで待たなければならない。したがって無線端末の低消費電力化・小型化を実現するために休止待ち受け状態の時間を長期に設定した場合は、休止待ち受け状態の時間に比例して基地局または監視部と無線端末のデータの送受信に時間がかかってしまう。
そこで、間欠時間間隔を短めに設定しておき、基地局または監視部は個々の無線端末からの無線端末付帯のセンサデバイス等の制御およびデータ収集のためのデータ送受信が完了したかを基地局または監視部と無線端端末間でのデータ送受信にともなう通信トラフィック量やデータ交信時間帯やセンサ情報や前記監視部に蓄積された制御情報を基に判断し、該無線端末に対して制御情報と時間同期情報を通報し、該無線端末においては時間同期情報をもとに時間同期を行った後に直ちに休止待ち受け状態に遷移する。
このことにより、無線端末の低消費電力化・小型化を兼ね備えたより良い通信信頼性を具備した無線通信システムを実現する。
During the time period in which the wireless terminal is in the standby state, communication between the base station or the monitoring unit and the wireless terminal is completely impossible. Therefore, the control information transmitted from the base station or the monitoring unit to the wireless terminal and the sensor information transmitted from the wireless terminal to the base station or the monitoring unit are transmitted. You have to wait until you get up. Therefore, when the standby state is set to a long time in order to reduce the power consumption and size of the wireless terminal, data transmission / reception between the base station or the monitoring unit and the wireless terminal is proportional to the standby state time. Takes time.
Therefore, the intermittent time interval is set to be short, and the base station or the monitoring unit determines whether the transmission / reception of data for the control and data collection of the sensor device attached to the wireless terminal from each wireless terminal is completed. Judgment is made based on the amount of communication traffic, data communication time zone, sensor information, and control information stored in the monitoring unit accompanying data transmission / reception between the monitoring unit and the wireless terminal, and the control information and time for the wireless terminal are determined. The wireless terminal is notified of the synchronization information, and after the wireless terminal performs time synchronization based on the time synchronization information, the wireless terminal immediately transitions to a standby state.
As a result, a wireless communication system having better communication reliability that combines low power consumption and downsizing of the wireless terminal is realized.
本発明によれば、基地局または監視部は個々の無線端末からの無線端末付帯のセンサデバイス等の制御およびデータ収集のためのデータ送受信が完了したかを基地局または監視部と無線端端末間でのデータ送受信にともなう通信トラフィック量やデータ交信時間帯やセンサ情報や前記監視部に蓄積された制御情報を基に基地局または監視部は無線端末の動作状態の期間や間欠時間周期を柔軟に制御することにより、無線端末の低消費電力化と無線端末に対する制御情報の反応時間短縮を同時に実現する。 According to the present invention, the base station or the monitoring unit determines whether data transmission / reception for control and data collection of the sensor device attached to the wireless terminal from each wireless terminal is completed or not between the base station or the monitoring unit and the wireless terminal. Based on the amount of communication traffic, data communication time zone, sensor information, and control information accumulated in the monitoring unit, the base station or monitoring unit flexibly sets the operating state period and intermittent time period of the wireless terminal. By controlling, it is possible to simultaneously reduce the power consumption of the wireless terminal and shorten the reaction time of control information for the wireless terminal.
以下、本発明の一実施例に係る通信システム及び無線端末を図面を用いて詳細に説明する。
図1に本発明の一実施例による遠隔監視無線通信システムを実現するための複数の無線端末4~8とこれら無線端末を統括する基地局3からなる無線通信システム、およびこの無線通信システムの上記基地局とインタフェースを介し無線端末に接続されているセンサデバイス等の制御およびデータ収集を行う監視部1の例を示す。ここで複数の上記無線端末と上記基地局は点線に示すとおりメッシュ状に無線回線で結ばれており、無線が直接届かない無線端末同士においも他無線端末を介して通信が可能なアドホックネットワークを形成している。ここで、図1では上記無線端末が4台、上記基地局が1台図示されているが、無線端末数は実際は1台以上であれば良い。
Hereinafter, a communication system and a wireless terminal according to an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a radio communication system comprising a plurality of
図2に無線端末の構成を示す。無線端端末は、無線端末が動作状態に遷移するまでセンサ情報を一時的に保存する記憶手段と無線端末を間欠期間動作に対して同期を取るためのカウンタもしくは計時手段と、制御情報および時間同期情報を受信し時間同期を取る手段を備えている。 FIG. 2 shows the configuration of the wireless terminal. The wireless terminal includes a storage means for temporarily storing sensor information until the wireless terminal transitions to an operating state, a counter or timing means for synchronizing the wireless terminal with respect to intermittent operation, control information and time synchronization Means for receiving information and synchronizing the time are provided.
図3に基地局の構成を示す。基地局または監視部の構成は、無線端末が動作状態に遷移するまで制御情報を一時的に保存する記憶手段と無線端末を間欠期間動作に対して同期を取るためのカウンタもしくは計時手段と、無線端末からの無線端末付帯のセンサデバイス等の制御およびデータ収集のためのデータ送受信が完了したかを基地局または監視部と無線端端末間でのデータ送受信にともなう通信トラフィック量やデータ交信時間帯やセンサ情報や前記監視部に蓄積された制御情報を基に判断する手段と、該無線端末に対して制御情報と時間同期情報を通報し、該無線端末においては時間同期情報を送信する手段を備えている。 FIG. 3 shows the configuration of the base station. The configuration of the base station or the monitoring unit includes a storage means for temporarily storing control information until the wireless terminal transitions to an operating state, a counter or timing means for synchronizing the wireless terminal with respect to intermittent operation, and a wireless Whether the data transmission and reception for control and data collection of the sensor device attached to the wireless terminal from the terminal has been completed, the amount of communication traffic and the data communication time zone accompanying the data transmission and reception between the base station or the monitoring unit and the wireless terminal Means for determining based on sensor information and control information stored in the monitoring unit, and means for reporting control information and time synchronization information to the wireless terminal, and transmitting the time synchronization information in the wireless terminal ing.
図4に監視部の構成を示す。基地局または監視部の構成は、無線端末が動作状態に遷移するまで制御情報を一時的に保存する記憶手段と無線端末を間欠期間動作に対して同期を取るためのカウンタもしくは計時手段と、無線端末からの無線端末付帯のセンサデバイス等の制御およびデータ収集のためのデータ送受信が完了したかを基地局または監視部と無線端端末間でのデータ送受信にともなう通信トラフィック量やデータ交信時間帯やセンサ情報や前記監視部に蓄積された制御情報を基に判断する手段と、該無線端末に対して制御情報と時間同期情報を通報し、該無線端末においては時間同期情報を送信する手段を備えている
無線端末は定期的に無線端末に接続されているセンサデバイス等により得られた計測結果をアドホックネットワークを介して基地局または監視部まで送信する。このとき無線端末が休止待ち受け状態の場合は一時的に保存する記憶手段に保存して、動作状態に遷移した場合に記憶手段から計測結果を読み込み、基地局または監視部に送信を行う。
FIG. 4 shows the configuration of the monitoring unit. The configuration of the base station or the monitoring unit includes a storage means for temporarily storing control information until the wireless terminal transitions to an operating state, a counter or timing means for synchronizing the wireless terminal with respect to intermittent operation, and a wireless Whether the data transmission and reception for control and data collection of the sensor device attached to the wireless terminal from the terminal has been completed, the amount of communication traffic and the data communication time zone accompanying the data transmission and reception between the base station or the monitoring unit and the wireless terminal Means for determining based on sensor information and control information stored in the monitoring unit, and means for reporting control information and time synchronization information to the wireless terminal, and transmitting the time synchronization information in the wireless terminal The wireless terminal periodically monitors the measurement results obtained by sensor devices connected to the wireless terminal via the ad hoc network or monitors it. Send to part. At this time, if the wireless terminal is in a standby state, it is stored in a storage unit that temporarily stores it, and when the wireless terminal transitions to an operating state, the measurement result is read from the storage unit and transmitted to the base station or the monitoring unit.
基地局または監視部は個々の無線端末からの無線端末付帯のセンサデバイス等の制御およびデータ収集のためのデータ送受信が完了したかを基地局または監視部と無線端端末間でのデータ送受信にともなう通信トラフィック量やデータ交信時間帯やセンサ情報や前記監視部に蓄積された制御情報を基に判断し、該無線端末に対して制御情報と時間同期情報を通報する。 Whether the base station or the monitoring unit has completed the data transmission / reception for control and data collection of the sensor device attached to the wireless terminal from the individual wireless terminal, according to the data transmission / reception between the base station or the monitoring unit and the wireless terminal. Judgment is made based on the amount of communication traffic, data communication time zone, sensor information, and control information stored in the monitoring unit, and the control information and time synchronization information are reported to the wireless terminal.
図5は、基地局または監視部が無線端末に対して制御情報と時間同期情報を通報する際の一連の流れを示す。基地局または監視部から無線端末に対して制御情報と時間同期情報を通報を伝達する際、基地局または監視部がインタフェースを介し無線端末に接続されているセンサデバイス等の制御およびデータ収集を行うまで実行時間を短くするために、無線端末の間欠周期を小刻みに設定する。 FIG. 5 shows a series of flows when the base station or the monitoring unit reports control information and time synchronization information to the wireless terminal. When transmitting control information and time synchronization information from the base station or monitoring unit to the wireless terminal, the base station or monitoring unit controls and collects data from the sensor devices connected to the wireless terminal via the interface. In order to shorten the execution time, the intermittent period of the wireless terminal is set in small increments.
アドホックネットワークの特性上、無線端末は一斉に立ち上がるが基地局または監視部は個々の無線端末からの無線端末付帯のセンサデバイス等の制御およびデータ収集のためのデータ送受信が完了したかを基地局または監視部と無線端端末間でのデータ送受信にともなう通信トラフィック量やデータ交信時間帯やセンサ情報や前記監視部に蓄積された制御情報を基に判断した場合は、該無線端末に対して制御情報を通報することにより、直ちに無線端末を休止待ち受け状態に遷移するので無線端末の動作状態を最大限短縮することができる。 Due to the characteristics of the ad hoc network, the wireless terminals start up all at once, but the base station or monitoring unit determines whether the transmission and reception of data for the control and data collection of the sensor devices attached to the wireless terminals from the individual wireless terminals has been completed. When judging based on the amount of communication traffic, data communication time zone, sensor information, and control information stored in the monitoring unit accompanying data transmission / reception between the monitoring unit and the wireless terminal, control information is transmitted to the wireless terminal. By notifying the wireless terminal, the wireless terminal immediately transitions to the standby state, so that the operating state of the wireless terminal can be shortened to the maximum.
さらに基地局または監視部は無線端末に対して上記制御情報と共に時間同期情報を送信することのより無線端末の時間同期が可能となり、起動時間ばらつき起因のアドホックネットワーク再構築時間遅延による消費電力増加や、これら起動時間ばらつきの累積による無線端末の同期はずれ起因の無線端末起動不全によるセンサデバイス等の制御およびデータ収集不全という遠隔監視通信システムとしての信頼性低下を防ぐことが可能である。 Furthermore, the base station or the monitoring unit can transmit the time synchronization information together with the control information to the wireless terminal, thereby enabling time synchronization of the wireless terminal, increasing power consumption due to ad hoc network reconstruction time delay due to start-up time variation, Further, it is possible to prevent a decrease in reliability as a remote monitoring communication system such as control of a sensor device or the like due to wireless terminal activation failure due to out-of-synchronization of wireless terminals due to accumulation of variations in activation time, and data collection failure.
さらに基地局または監視部は通信トラフィック量やデータ交信時間帯やセンサ情報や前記監視部に蓄積された制御情報を基に無線端末の動作状態時間や間欠時間間隔を判断し、該無線端末に対して制御情報と時間同期情報と共に動作状態時間情報や間欠時間間隔情報を通報することにより、ネットワークの状況に応じた間欠時間間隔や休止待ち受け時間の調整を行うことが可能である。 Further, the base station or the monitoring unit determines the operation state time and the intermittent time interval of the wireless terminal based on the communication traffic volume, the data communication time zone, the sensor information, and the control information stored in the monitoring unit, and By reporting the operation state time information and the intermittent time interval information together with the control information and the time synchronization information, it is possible to adjust the intermittent time interval and the standby time according to the network status.
無線端末が休止待ち受け状態である時間帯は、基地局または監視部と無線端末の通信は一切不可能となる。したがって基地局または監視部から無線端末に送信される制御情報や無線端末から基地局または監視部に送信されるセンサ情報が伝達されるのに、無線端末が動作状態に遷移することによりアドホックセットワークが立ち上がるまで待たなければならない。上記の問題を解決する為に間欠時間間隔(間欠周期)を小刻みに設定することは省電力化の観点から不利となる。 During the time period in which the wireless terminal is in the standby state, communication between the base station or the monitoring unit and the wireless terminal is completely impossible. Therefore, the control information transmitted from the base station or the monitoring unit to the wireless terminal and the sensor information transmitted from the wireless terminal to the base station or the monitoring unit are transmitted. You have to wait until you get up. In order to solve the above problem, setting the intermittent time interval (intermittent cycle) in small increments is disadvantageous from the viewpoint of power saving.
そこで、基地局または監視部は基地局または監視部と無線端端末間でのデータ送受信にともなう通信トラフィック量やデータ交信時間帯やセンサ情報や視部に蓄積された制御情報を基に無線端末の動作状態の期間や間欠時間周期を柔軟に制御することにより、無線端末の低消費電力化と無線端末に対する制御情報の反応時間短縮を同時に実現することが可能である。 Therefore, the base station or the monitoring unit is based on the communication traffic volume, the data communication time zone, the sensor information, and the control information accumulated in the visual unit associated with the data transmission / reception between the base station or the monitoring unit and the wireless terminal. By flexibly controlling the period of operation state and the intermittent time period, it is possible to simultaneously reduce the power consumption of the wireless terminal and shorten the reaction time of control information for the wireless terminal.
無線端末は基地局または監視部から動作状態から休止待ち受け状態に遷移することを指示した制御情報を受信した場合は直ちに休止待ち受け状態に遷移するが可能であるが、上記制御情報を受信した端末がばらばらに休止待ち受け状態に遷移した場合、他の無線端末に上記制御情報が伝達できない場合がある。したがって、無線端末は上記制御情報を受信した場合も一定の時間(タイムラグ)を待った後、休止待ち受け状態に遷移するものとする。 When the wireless terminal receives control information instructing to transition from the operating state to the suspension standby state from the base station or the monitoring unit, the wireless terminal can immediately transition to the suspension standby state, but the terminal that has received the control information When transitioning to the idle standby state, the control information may not be transmitted to other wireless terminals. Therefore, even when the wireless terminal receives the control information, the wireless terminal waits for a certain time (time lag) and then shifts to a standby state.
無線端末は基地局または監視部から動作状態から休止待ち受け状態に遷移することを指示した制御情報を受信した場合は直ちに休止待ち受け状態に遷移するが可能であるが、上記制御情報を受信した端末がばらばらに休止待ち受け状態に遷移した場合、他の無線端末に上記制御情報が伝達できない場合がある。上記の事態を回避するために上記制御情報に休止待ち受け状態に遷移する時刻を記しておき、上記無線端末が一斉に休止待ち受け状態に遷移することも可能である。
無線端末は基地局または監視部から時間同期情報を受信した場合は、無線端末を間欠期間動作に対して同期を取るためのカウンタもしくは計時手段の時刻調整を行う。
When the wireless terminal receives control information instructing to transition from the operating state to the suspension standby state from the base station or the monitoring unit, the wireless terminal can immediately transition to the suspension standby state, but the terminal that has received the control information When transitioning to the idle standby state, the control information may not be transmitted to other wireless terminals. In order to avoid the above situation, it is possible to record the time for transitioning to the suspension standby state in the control information, and the wireless terminals can transition to the suspension standby state all at once.
When the wireless terminal receives the time synchronization information from the base station or the monitoring unit, the wireless terminal adjusts the time of a counter or time measuring means for synchronizing the wireless terminal with the intermittent operation.
無線端末は基地局または監視部から時間同期情報を受信した場合は、無線端末を間欠期間動作に対して同期を取るためのカウンタもしくは計時手段の時刻調整を行う。このことにより、起動時間ばらつき起因のアドホックネットワーク再構築時間遅延による消費電力増加や、これら起動時間ばらつきの累積による無線端末の同期はずれ起因の無線端末起動不全によるセンサデバイス等の制御およびデータ収集不全という遠隔監視通信システムとしての信頼性低下を防ぐことが可能である。 When the wireless terminal receives the time synchronization information from the base station or the monitoring unit, the wireless terminal adjusts the time of a counter or time measuring means for synchronizing the wireless terminal with the intermittent operation. As a result, power consumption increases due to delays in reconfiguration time due to ad hoc network reconstruction due to variations in activation time, and sensor device control and data collection failures due to radio terminal activation failure due to the accumulation of these activation time variations. It is possible to prevent a decrease in reliability as a remote monitoring communication system.
1・・・監視部
2・・・インターネット
3・・・基地局
4〜8・・・無線端末
9・・・無線回線
11・・・記録手段
12・・・センサ
13・・・カウンタまたは時計手段
14・・・無線部
21・・・データ送受信完了判断手段
22・・・記憶手段
23・・・カウンタまたは時計手段
24・・・無線部
26・・・マイコン
27・・・給電部
31・・・データ送受信完了判断手段
32・・・記憶手段
33・・・カウンタまたは時計手段
34・・・通信手段
35・・・インターネット
36・・・マイコン
37・・・給電部
1 ... Monitoring unit
2 ... Internet
3 ... Base station
4-8 ... Wireless terminal
9 ... Wireless line
11 ... Recording means
12 ... Sensor
13 ... Counter or clock means
14 ... Radio part
21 ... Data transmission / reception completion judging means
22 ... Storage means
23 ... Counter or clock means
24 ・ ・ ・ Radio part
26 ... Microcomputer
27 ... Power supply unit
31 ... Data transmission / reception completion judging means
32 ... Storage means
33 ... Counter or clock means
34 ... Communication means
35 ... Internet
36 ... Microcomputer
37 ... Power supply unit
Claims (13)
前記複数の無線端末は無線信号が直接届かない無線端末同士においても他無線端末を介して通信を可能とするアドホックネットワークを構築するとともに、該無線端末の低消費電力化のために、該無線端末は定期的に起動し基地局間でのデータ送受信しその後再び休止待ち受け状態に遷移する間欠動作を行う構成において、
基地局または監視部は前記個々の無線端末からの無線端末付帯のセンサデバイス等の制御およびデータ収集のためのデータ送受信を完了したと判断した場合、該無線端末に対して制御情報と時間同期情報を通報し、該無線端末においては時間同期情報をもとに時間同期を行った後に直ちに休止待ち受け状態に遷移する、ことを特徴とする遠隔監視通信システム。 A wireless communication system comprising a plurality of wireless terminals to which sensor devices and the like are attached and a base station that supervises these wireless terminals, and sensor devices connected to the wireless terminals via an interface with the base station of the wireless communication system A remote monitoring communication system comprising a monitoring unit for controlling and collecting data,
The plurality of wireless terminals constructs an ad hoc network that enables communication between wireless terminals that do not directly receive wireless signals via other wireless terminals, and the wireless terminals reduce power consumption of the wireless terminals. Is configured to perform an intermittent operation of periodically starting, transmitting and receiving data between base stations, and then transitioning to a standby state again,
When the base station or the monitoring unit determines that the data transmission and reception for the control and data collection of the sensor device attached to the wireless terminal from the individual wireless terminal is completed, the control information and the time synchronization information are transmitted to the wireless terminal. A remote monitoring communication system, wherein the radio terminal immediately transitions to a standby state after performing time synchronization based on time synchronization information.
基地局または監視部は前記個々の無線端末からの無線端末付帯のセンサデバイス等の制御およびデータ収集のためのデータ送受信が完了したかを基地局または監視部と無線端端末間でのデータ送受信にともなう通信トラフィック量またはデータ交信時間帯またはセンサ情報または前記監視部に蓄積された制御情報を基に判断し、該無線端末に対して制御情報と時間同期情報を通報し、該無線端末においては時間同期情報をもとに時間同期を行った後に直ちに休止待ち受け状態に遷移することを特徴とする遠隔監視通信システム。 Control and data collection of a plurality of wireless terminals attached with sensor devices and the like, a base station that supervises these wireless terminals, and sensor devices connected to the wireless terminals via an interface with the base station of this wireless communication system A remote monitoring communication system comprising a monitoring unit for performing an ad hoc network in which the plurality of wireless terminals can communicate with each other even when wireless signals do not reach directly via other wireless terminals; In order to reduce the power consumption of the wireless terminal, the wireless terminal is periodically activated, transmits and receives data between base stations, and then performs an intermittent operation of transitioning to a standby state again.
Whether the base station or the monitoring unit has completed data transmission / reception for control and data collection of the wireless terminal-attached sensor device or the like from the individual wireless terminal for data transmission / reception between the base station or the monitoring unit and the wireless terminal. Judgment is based on the amount of communication traffic, data communication time zone, sensor information, or control information stored in the monitoring unit, and the control information and time synchronization information are reported to the wireless terminal. A remote monitoring communication system characterized in that after performing time synchronization based on synchronization information, a transition is made immediately to a standby state.
When the wireless terminal cannot receive control information or time synchronization information from the monitoring unit or the base station due to quality degradation of a wireless line, etc., the wireless terminal transitions to a standby state after a certain time has elapsed after startup. The remote monitoring communication system according to claim 1.
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