JP2011009974A - Radio communication system and radio communication method - Google Patents

Radio communication system and radio communication method Download PDF

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JP2011009974A
JP2011009974A JP2009150441A JP2009150441A JP2011009974A JP 2011009974 A JP2011009974 A JP 2011009974A JP 2009150441 A JP2009150441 A JP 2009150441A JP 2009150441 A JP2009150441 A JP 2009150441A JP 2011009974 A JP2011009974 A JP 2011009974A
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radio
communication quality
communication
relay
route
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JP5244714B2 (en
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Kenji Imamoto
健二 今本
Yoshinori Okura
敬規 大倉
Yoshito Sato
義人 佐藤
Yoichi Sugita
洋一 杉田
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Hitachi Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a desired communication environment by automatically setting evaluation about a radio service area and a relay path for radio communication in a radio communication environment in which a radiowave intensity varies due to movement of person and object.SOLUTION: A central server 2 utilizes an operation plan of worker's behavior, carriage delivery or the like in the service area of radio communication, and estimates a communication quality of a relay path in each time zone to derive an optimum relay path in each time zone. Each radio station 1 avoids degradation of robustness and real-time properties of communication owing to fluctuation by changing the relay path before the occurrence of the fluctuation estimated by the central server 2. Further, the central server 2 includes a state display device 25 for displaying the state of the communication environment to display: a countermeasure for improving the communication quality; and a point where the communication quality falls.

Description

本発明は、無線通信システム及び無線通信方法に関し、特に、プラント内など作業員移動や荷物搬入等により通信環境が変動する環境に適用が好ましい無線通信システム及び無線通信方法に関する。   The present invention relates to a wireless communication system and a wireless communication method, and more particularly to a wireless communication system and a wireless communication method that are preferably applied to an environment where the communication environment varies due to movement of workers, loading of cargo, etc.

プラント内の様々な作業場所にセンサを配置し，各センサにより測定された情報を無線通信により収集することでプラントの無人監視を行うプラント計装無線技術の導入が進められている。無線によるデータ伝送においては，反射による遅延波やビット誤りによるデータ伝送速度の低下，多数の無線局器導入により発生する干渉が存在するため，良好な無線通信環境を創出するには車両や周辺建築物が及ぼす影響を計画・設計の段階から評価し，無線局の無線通信中継経路を決定することが必要となる。   Introduction of plant instrumentation wireless technology that unattended monitoring of a plant by arranging sensors at various work locations in the plant and collecting information measured by each sensor by wireless communication is in progress. In wireless data transmission, there is a decrease in data transmission speed due to reflections and bit errors due to reflection, and interference caused by the introduction of a large number of wireless stations. It is necessary to evaluate the influence of objects from the planning and design stage and determine the wireless communication relay route of the wireless station.

通信性能は設置環境の優劣に大きく依存するため，無線通信システムの設計では一般に，現地においてパラメタを変えながら通信性能を確認する試行錯誤的な作業を繰り返し，要求する通信性能を満たすことができる設置場所や台数などを決定する必要があった。   Since communication performance greatly depends on the superiority or inferiority of the installation environment, in general, in the design of a wireless communication system, installation that can satisfy the required communication performance by repeating trial and error work to confirm the communication performance while changing parameters in the field It was necessary to determine the location and number of units.

上記のようにあらかじめネットワークの設計を行ったとしても、プラントでは建造物の新築や撤去などの構造物変化や、クレーンや作業員などの物体移動による通信環境の変動が発生することから、その変動に応じたパラメタの最適化が必要となる。   Even if the network is designed in advance as described above, the change in the communication environment occurs due to structural changes such as new construction or removal of buildings, and movement of objects such as cranes and workers in the plant. It is necessary to optimize the parameters according to.

例えば、電波伝搬シミュレータを用いた無線パラメタチューニングを行う。本手法では、無線局における電波強度の測定値を用いて、シミュレーションの際に用いる減衰特性を示した数式（奥村カーブ，秦式など）を補正することによって実環境の伝搬を模擬している。このような技術は、特開２００５−２２３７３２号公報に記載されている。   For example, wireless parameter tuning using a radio wave propagation simulator is performed. In this method, the propagation of the real environment is simulated by correcting the mathematical expression (Okumura curve, 秦 expression, etc.) indicating the attenuation characteristics used in the simulation, using the measured value of the radio field intensity at the wireless station. Such a technique is described in Japanese Patent Application Laid-Open No. 2005-223732.

また、無線局は周辺の無線局とテスト信号のやり取りを行うことで最短の中継経路を確立しておき、通信する際には事前に確立した中継経路の無線局に対してデータを送信する。このような技術は、特願平８−２０１２９号公報に記載されている。   In addition, the wireless station establishes the shortest relay path by exchanging test signals with neighboring wireless stations, and transmits data to the wireless stations on the relay path established in advance. Such a technique is described in Japanese Patent Application No. 8-20129.

特開２００５−２２３７３２号公報JP 2005-223732 A 特願平８−２０１２９号公報Japanese Patent Application No. 8-20129

上記の術来技術では、通信環境や適用すべき数式が既知である場合は通信環境をシミュレーション可能であるが、周辺建築物の構造変化など通信環境が変動する状況では適用すべき数式も変化するため、こういった状況では通信環境の推定ができない。また特許文献２記載の手法では、テスト信号により測定して高い通信品質が得られた経路であっても、環境変動時には通信品質が変化するため、不適切な中継経路を使用し、通信のリアルタイム性が確保できない状況が発生する。また中継経路の評価値として中継時間のみを使用するため、干渉波の発生や災害による機器故障，障害物による電波の遮蔽など、障害に対する耐性（ロバスト性）を考慮していない。よって従来手法では、無線サービスエリアに対して所望の通信品質を安定して提供できない。   In the above technique, the communication environment can be simulated when the communication environment and the mathematical formula to be applied are known, but the mathematical formula to be applied also changes in a situation where the communication environment fluctuates, such as the structural changes of surrounding buildings. Therefore, the communication environment cannot be estimated in such a situation. Further, in the method described in Patent Document 2, even if the route has a high communication quality measured by a test signal, the communication quality changes when the environment changes. The situation where the sex cannot be secured occurs. Further, since only the relay time is used as the evaluation value of the relay path, tolerance (robustness) against the failure such as generation of an interference wave, equipment failure due to a disaster, shielding of radio waves due to an obstacle is not considered. Therefore, the conventional method cannot stably provide desired communication quality to the wireless service area.

本発明の目的は、上記の問題に鑑み、人や物の移動，周辺建築物の構造変化等により通信状態の変化が生じる環境において、その環境に適応して、通信品質の向上が可能となる無線通信システム及び無線通信方法を提供することにある。   In view of the above problems, an object of the present invention is to adapt to an environment in which a communication state changes due to movement of a person or an object, a structural change of a surrounding building, etc., and improve communication quality. A wireless communication system and a wireless communication method are provided.

上記目的を達成するため、本発明では、通信に影響を与える構造物の時間に対する位置的変位を推定し、推定部の推定に基づいて中継経路を構成する無線中継局を選択し、所定の無線局との間で選択された無線中継局を介して通信するように構成した。   In order to achieve the above object, in the present invention, a positional displacement of a structure that affects communication with respect to time is estimated, a radio relay station that constitutes a relay path is selected based on the estimation of the estimation unit, and a predetermined radio It was configured to communicate with a station via a selected radio relay station.

より具体的には、（１）無線サービスエリア内における通信品質として無線局が受信した通信のＢＥＲ（Bit Error Rate），ＰＥＲ（Packet Error Rate），パケット到達率，通信遅延時間，受信電力，到来角度，位相，遅延プロファイルのいずれか一つ以上を測定し、（２）無線サービスエリア内の運用計画（荷物搬入，作業員移動など）を入力し、（３）該運用計画を元に通信環境の変動状況や変動発生時間を予測し、各時間帯・状況において適切な中継経路を導出することで、通信環境の変動に応じた中継経路の自動調整を可能とした。   More specifically, (1) BER (Bit Error Rate), PER (Packet Error Rate), packet arrival rate, communication delay time, received power, arrival of communication received by the wireless station as communication quality within the wireless service area Measure one or more of the angle, phase, and delay profiles, (2) enter the operation plan (cargo loading, worker movement, etc.) within the wireless service area, and (3) the communication environment based on the operation plan It is possible to automatically adjust the relay route according to the change of the communication environment by predicting the fluctuation situation and fluctuation occurrence time and deriving an appropriate relay route in each time zone and situation.

また経路導出は、運用計画入力として入力された情報や、無線サービスエリア内における通信品質の測定値を一定期間記録しておき、その記録情報より得られる通信環境変動の周期性（時間帯・曜日・時季による通信品質変動の周期性など）を元に通信環境の変動状況や変動発生時間を予測し、各時間帯・状況において適切な中継経路を導出する機能とを有する。   Also, route derivation records the information entered as operation plan input and the measured value of communication quality in the wireless service area for a certain period, and the periodicity of the communication environment fluctuation (time zone / day of the week) obtained from the recorded information・ It has a function to predict the communication environment fluctuation status and fluctuation occurrence time based on the communication quality fluctuation periodicity, etc., and to derive an appropriate relay route in each time zone and situation.

本発明によれば、人や物の移動，周辺建築物の構造変化等により通信環境の変化が生じる環境においても、その環境の変化に対して、中継経路を適切に調整することにより、所望の通信環境を実現できる。   According to the present invention, even in an environment where a communication environment changes due to movement of people or objects, structural changes of surrounding buildings, etc., by appropriately adjusting the relay route with respect to the change of the environment, A communication environment can be realized.

本発明の実施例１による無線通信システムの構成の一例を示す図である。It is a figure which shows an example of a structure of the radio | wireless communications system by Example 1 of this invention. 本発明の実施例１による無線通信システムの構成の一例（図１記載の構成に中継経路格納装置および時間測定装置を追加した構成）を示す図である。It is a figure which shows an example of the structure of the radio | wireless communications system by Example 1 of this invention (structure which added the relay path | route storage apparatus and the time measurement apparatus to the structure of FIG. 1). 本発明の実施例１による無線通信システムの構成の一例（図１記載の構成に中継経路格納装置および通信品質判定装置を追加した構成）を示す図である。It is a figure which shows an example (structure which added the relay path | route storage apparatus and the communication quality determination apparatus to the structure of FIG. 1) of the structure of the radio | wireless communications system by Example 1 of this invention. 本発明が対象とする無線通信システムの利用環境の一例を示す図である。It is a figure which shows an example of the utilization environment of the radio | wireless communications system which this invention makes object. 本発明の実施例１での中央サーバによる無線通信システムの中継経路設定手順を示すフローチャートである。It is a flowchart which shows the relay route setting procedure of the radio | wireless communications system by the central server in Example 1 of this invention. 本発明の実施例１での無線局による無線通信システムの中継経路切り替え手順（現在時刻に応じた切り替え手順）を示すフローチャートである。It is a flowchart which shows the relay route switching procedure (switching procedure according to the present time) of the radio | wireless communications system by the radio station in Example 1 of this invention. 本発明の実施例１での無線局による無線通信システムの中継経路切り替え手順（現在の通信品質に応じた切り替え手順）を示すフローチャートである。It is a flowchart which shows the relay path | route switching procedure (switching procedure according to the present communication quality) of the radio | wireless communications system by the radio station in Example 1 of this invention. 通信品質の時間変動の一例を示す図である。It is a figure which shows an example of the time fluctuation | variation of communication quality. 本発明の中継経路の通信品質を評価する手法の一例を示す図である。It is a figure which shows an example of the method of evaluating the communication quality of the relay path | route of this invention. 本発明の耐故障性評価手法を説明する一例として、一定範囲内に存在する無線局の通信品質劣化が発生する状況を示す図である。It is a figure which shows the condition where the communication quality degradation of the radio station which exists in a fixed range generate | occur | produces as an example explaining the fault tolerance evaluation method of this invention. 本発明の耐故障性評価手法を説明する一例として、通信路が遮蔽された場合の通信品質劣化が発生する状況を示す図である。It is a figure which shows the condition where communication quality degradation generate | occur | produces when a communication path is shielded as an example explaining the fault tolerance evaluation method of this invention. 本発明の状態表示装置２５のアラーム表示画面の一例を示す図である。It is a figure which shows an example of the alarm display screen of the status display apparatus 25 of this invention.

以下、本発明の実施の形態について、図面を参照して説明する。ただし、図面は模式的なものであることに留意すべきである。   Embodiments of the present invention will be described below with reference to the drawings. However, it should be noted that the drawings are schematic.

図１に本実施例の構成を示す。本実施例では、無線通信システムは無線局１，中央サーバ２，ネットワーク３により構成される。無線局１は無線通信システム内に１台以上存在し、無線局間の通信は無線通信によって行われる。また各無線局１は、他無線局および中央サーバ２とネットワーク３を介して通信を行う。   FIG. 1 shows the configuration of this embodiment. In the present embodiment, the wireless communication system includes a wireless station 1, a central server 2, and a network 3. One or more wireless stations 1 exist in the wireless communication system, and communication between the wireless stations is performed by wireless communication. Each radio station 1 communicates with other radio stations and the central server 2 via the network 3.

無線通信システムの構築例を図４に示す。本例では４台の無線局１（１ａ，１ｂ，１ｃ，１ｄ）および中央サーバ２を無線サービスエリア内に配置している。ただし中央サーバ２は必ずしもサービスエリア内に存在していなくても良い。図４の外枠は通信品質として無線局１が受信する無線通信のＢＥＲ（Bit Error Rate），ＰＥＲ（Packet Error Rate），パケット到達率，通信遅延時間，受信電力，到来角度，位相，遅延プロファイルのいずれか一つ以上を推定する際の解析領域２００であり、無線サービスエリアは解析領域２００内に含まれる。解析領域２００内には、建物や移動物体（作業員，車両，建築物，クレーンなど）である多数のオブジェクトが存在する。無線通信システムを運用する場合、中央サーバ２は、運用計画情報や各無線局から受け取った通信品質測定値を用い、変動発生の時間帯や発生箇所２０１を推定し、その変動に応じて各無線局の中継経路を適切に設定することで、所望の通信品質を提供する。   A construction example of a wireless communication system is shown in FIG. In this example, four wireless stations 1 (1a, 1b, 1c, 1d) and a central server 2 are arranged in the wireless service area. However, the central server 2 does not necessarily exist in the service area. The outer frame of FIG. 4 shows the BER (Bit Error Rate), PER (Packet Error Rate), packet arrival rate, communication delay time, received power, arrival angle, phase, delay profile of wireless communication received by the wireless station 1 as the communication quality. The wireless service area is included in the analysis area 200. In the analysis area 200, there are many objects such as buildings and moving objects (workers, vehicles, buildings, cranes, etc.). When operating the wireless communication system, the central server 2 estimates the fluctuation occurrence time zone and the occurrence location 201 using the operation plan information and the communication quality measurement values received from the respective radio stations, and sets each radio depending on the fluctuation. A desired communication quality is provided by appropriately setting the relay path of the station.

図１に示すように、無線局１は、無線送受信装置１１と、受信した通信の通信品質を測定する通信品質測定装置１２と、中央サーバ２より通知された中継経路を無線通信の際に適用する中継制御装置１３と、無線通信の送信，受信，測定に使用するアンテナ１４を有する。また図２に示すように、無線局１は、中央サーバ２より通知された中継経路を格納する中継経路格納装置１５と、現在の時刻を計測する時間測定装置１６を有しても良い。また図３に示すように、無線局１は、中央サーバ２より通知された中継経路を格納する中継経路格納装置１５と、通信品質測定値を元に通信品質の変動発生の有無を判定する通信品質判定装置１７を有しても良い。   As shown in FIG. 1, the wireless station 1 applies a wireless transmission / reception device 11, a communication quality measurement device 12 that measures the communication quality of received communication, and a relay route notified from the central server 2 during wireless communication. A relay control device 13 and an antenna 14 used for transmission, reception and measurement of wireless communication. As illustrated in FIG. 2, the wireless station 1 may include a relay route storage device 15 that stores the relay route notified from the central server 2 and a time measurement device 16 that measures the current time. As shown in FIG. 3, the wireless station 1 communicates with the relay path storage device 15 that stores the relay path notified from the central server 2 and communication for determining whether or not the communication quality has changed based on the communication quality measurement value. You may have the quality determination apparatus 17. FIG.

中央サーバ２は、無線局１より送信された測定値を格納する通信品質格納装置２１と、無線サービスエリア内の運用計画（荷物搬入，作業員配置など）を入力するための運用計画入力装置２２と、運用計画や通信品質の測定値を元に、無線サービスエリア内における通信品質の時間変動を推定する通信品質推定装置２３と、通信品質推定装置２３により推定された通信品質を元に、各時間帯において適切な中継経路を導出する経路導出装置２４と、通信品質推定装置２３および経路導出装置２４が出力した情報を基にシステム管理者に対してサービスエリア内の通信環境の状況や通信改善のための対策などを表示する状態表示装置２５を有する。   The central server 2 has a communication quality storage device 21 for storing the measurement values transmitted from the wireless station 1 and an operation plan input device 22 for inputting an operation plan (cargo loading, worker placement, etc.) in the wireless service area. Based on the operation plan and communication quality measurement values, the communication quality estimation device 23 for estimating the temporal variation of the communication quality in the wireless service area, and the communication quality estimated by the communication quality estimation device 23, Based on the information output by the route deriving device 24 for deriving an appropriate relay route in the time zone, the communication quality estimating device 23 and the route deriving device 24, the system administrator is informed of the communication environment in the service area and the communication improvement. It has a status display device 25 for displaying countermeasures and the like.

以下では、本実施例における中継経路設定手順を説明する。図５に中継経路設定時に中央サーバ２が実施する作業のフローチャートを示す。中央サーバ２は、まずステップ９０００において無線サービスエリア内での無線通信環境の変動を予測し、ステップ９００１において変動が発生した場合の各無線局間の無線通信に関する通信品質を推定する。ステップ９００２において推定された通信品質や要件を元に、その変動に適した中継経路を導出し、ステップ９００３において各無線局へ中継経路情報を通知する。各手順の詳細については以下で述べる。   Hereinafter, a relay route setting procedure in this embodiment will be described. FIG. 5 shows a flowchart of work performed by the central server 2 when setting a relay route. The central server 2 first predicts a change in the wireless communication environment within the wireless service area in Step 9000 and estimates communication quality related to wireless communication between the wireless stations when the change occurs in Step 9001. Based on the communication quality and requirements estimated in step 9002, a relay route suitable for the change is derived, and in step 9003, the relay route information is notified to each radio station. Details of each procedure are described below.

無線局１による中継処理の手順は以下の通り。無線局１は、ステップ９００３において中央サーバ２より通知された中継経路情報を元に、中継制御装置１３によって中継経路の切り替えを行う。経路を切り替えた場合、経路を切り替えた旨を無線送受信装置１１により中央サーバ２および他無線局へ通知する。他無線局へのデータ中継処理を行う場合、その時点で次の中継先として設定されている無線局へ中継データを送信する。   The procedure of relay processing by the radio station 1 is as follows. The wireless station 1 switches the relay route by the relay control device 13 based on the relay route information notified from the central server 2 in step 9003. When the route is switched, the wireless transmission / reception apparatus 11 notifies the central server 2 and other wireless stations that the route has been switched. When data relay processing to another radio station is performed, relay data is transmitted to the radio station set as the next relay destination at that time.

無線局１による上記中継処理では、経路を切り替えるタイミングを決定する際、時間測定装置１６を用いても良い。ステップ９００３において中央サーバ２より通知された中継経路情報には、中継経路を切り替える時刻が含まれているとする。無線局１の時間測定装置１６を用いた中継処理のフローチャートを図６に示す。無線局１は、時間測定装置１６を用い、ステップ９１００において現在時刻を取得する。中継制御装置１３は、ステップ９００３において中継経路格納装置１５に格納している中継経路情報に含まれる中継経路へ切り替える時刻を確認し、ステップ９１０１において現在時刻が経路切り替え時刻に達しているかどうかを判定する。切り替え時刻に達している場合、ステップ９１０２において中継制御装置１３は指示された中継経路に切り替える。   In the relay processing by the wireless station 1, the time measuring device 16 may be used when determining the timing for switching the route. It is assumed that the relay route information notified from the central server 2 in step 9003 includes the time for switching the relay route. A flowchart of the relay process using the time measuring device 16 of the radio station 1 is shown in FIG. The wireless station 1 uses the time measuring device 16 and acquires the current time in step 9100. In step 9003, the relay control device 13 confirms the time for switching to the relay route included in the relay route information stored in the relay route storage device 15, and determines in step 9101 whether the current time has reached the route switching time. To do. If the switching time has been reached, in step 9102 the relay control device 13 switches to the instructed relay route.

無線局１による上記中継処理では、経路を切り替えるタイミングを決定する際、通信品質判定装置１７を用いても良い。ステップ９００３において中央サーバ２より通知された中継経路情報には、中継経路を切り替える通信品質の閾値が含まれているとする。無線局１の通信品質判定装置１７を用いた中継処理のフローチャートを図７に示す。無線局１は、通信品質測定装置１２を用い、ステップ９２００において他無線局からの無線通信の通信品質を測定する。通信品質判定装置１７は、通信品質測定装置１２の測定値とステップ９００３において中継経路格納装置１５に格納した中継経路情報に含まれる閾値を比較し、ステップ９２０１において現時点の通信品質が経路切り替えの閾値に達しているかどうかを判定する。閾値に達している場合、通信品質判定装置１７は変動が発生したと判定し、ステップ９２０２において該判定を元に中継制御装置１３は指示された中継経路に切り替える。この方法は、上記の時間測定する方法と組み合わせても良い。適用する閾値は中央サーバ２が通信品質推定装置２３により推定した通信品質の変動を元に変動の検知に適切な上記閾値を決定し、ステップ９００３において無線局１に通知する中継経路情報に含んでも良い。無線局１は、通知された中継経路情報に含まれる閾値に関する情報を元に、通信環境の変動状況や時刻に応じて適用する閾値を変更しても良い。また、通信品質を測定し、通信品質推定装置２３が予測していた通信品質と測定値に閾値以上の差がある場合、通信品質推定の誤差が発生したとみなし、測定値を元に適切な中継経路へ切り替えても良い。   In the relay processing by the wireless station 1, the communication quality determination device 17 may be used when determining the timing for switching the route. It is assumed that the relay route information notified from the central server 2 in step 9003 includes a communication quality threshold value for switching the relay route. A flowchart of the relay process using the communication quality determination device 17 of the wireless station 1 is shown in FIG. The wireless station 1 uses the communication quality measuring device 12 to measure the communication quality of wireless communication from other wireless stations in step 9200. The communication quality determination device 17 compares the measurement value of the communication quality measurement device 12 with the threshold value included in the relay route information stored in the relay route storage device 15 in step 9003. In step 9201, the current communication quality is the threshold value for route switching. It is determined whether or not. If the threshold is reached, the communication quality determination device 17 determines that a change has occurred, and in step 9202, the relay control device 13 switches to the instructed relay route based on the determination. This method may be combined with the time measurement method described above. The threshold value to be applied may be included in the relay route information notified to the wireless station 1 in step 9003 by determining the above threshold value suitable for detecting the fluctuation based on the fluctuation of the communication quality estimated by the central server 2 by the communication quality estimation device 23. good. The radio station 1 may change the threshold to be applied according to the communication environment change status and time based on the information about the threshold included in the notified relay route information. Further, when communication quality is measured and there is a difference between the communication quality predicted by the communication quality estimation device 23 and the measured value that is equal to or greater than the threshold value, it is considered that an error in the communication quality estimation has occurred, and an appropriate value based on the measured value You may switch to a relay route.

中央サーバ２は、上記無線通信環境の変動を予測するステップ９０００や通信品質を推定するステップ９００１において、通信品質格納装置２１に格納している通信品質測定値と、該測定値を測定した時間に関する情報を用い、統計処理やデータマイニング，ベイズ推定などの手法により通信品質が変動する周期性を解析しても良い。図８に、通信品質の測定値の例を示す。図８の横軸は測定を開始してからの経過時間を表し、縦軸はサービスエリア内のある無線局から別の無線局へ無線通信した際のパケット到達率を表す。パケット到達率は、ある無線局１から既知のテスト信号を一定パケット数だけ送信し、該テスト信号を受信した無線局が正しく受信できたパケット数を確認することで、その無線局間の経路におけるパケット到達率を算出しても良い。図８に示す測定結果より、８時から２０時まで（作業者の労働時間帯）はパケット到達率が低く通信が不安定であり、それ以外の時間では安定していることが分かる。労働時間帯では作業者が無線局間で作業し、無線局間の電波伝搬路が作業者の移動等により塞がれたことで通信品質が落ちたと推測される。こういった通信品質変動の周期性を利用して変動発生を事前に予測し、その変動に応じて安定した経路への切り替えや多重経路を構築することで、通信のロバスト性を維持する。また、通信品質はある時間を境に突然変動するのではなく、一定の移行期間が存在する。図８では、７時〜８時半および１９時〜２１時の時間帯は作業時間外（２１時〜７時）より通信品質が劣化しているが、作業時間内（８時半〜１９時）よりは品質が良い。こういった過渡現象は、作業者がある上記時間帯に徐々に出退勤することで、通信品質の変動が徐々に現れることから発生する。通信品質の変動量を測定して経路切り替えを行う方法では、上記のような通信品質の過渡現象を検知することで、通信品質の劣化を予測した経路切り替えが可能となる。   The central server 2 relates to the communication quality measurement value stored in the communication quality storage device 21 and the time when the measurement value is measured in the step 9000 for predicting the fluctuation of the wireless communication environment and the step 9001 for estimating the communication quality. Information may be used to analyze periodicity in which communication quality varies by techniques such as statistical processing, data mining, and Bayesian estimation. FIG. 8 shows an example of measured values of communication quality. The horizontal axis in FIG. 8 represents the elapsed time since the start of measurement, and the vertical axis represents the packet arrival rate when wireless communication is performed from one wireless station to another wireless station in the service area. The packet arrival rate is determined by transmitting a known number of test signals from a certain wireless station 1 and confirming the number of packets correctly received by the wireless station that has received the test signal. The packet arrival rate may be calculated. From the measurement results shown in FIG. 8, it can be seen that from 8 o'clock to 20 o'clock (working hours of the worker), the packet arrival rate is low and the communication is unstable, and it is stable at other times. It is presumed that the communication quality deteriorated because the worker worked between the radio stations during the working hours and the radio wave propagation path between the radio stations was blocked by the movement of the worker. By using such periodicity of communication quality fluctuations, the occurrence of fluctuations is predicted in advance, and the robustness of communication is maintained by switching to a stable path or constructing multiple paths according to the fluctuations. Also, the communication quality does not change suddenly at a certain time, but there is a certain transition period. In FIG. 8, the communication quality deteriorates outside the work hours (21:00 to 7 o'clock) in the time zone from 7 o'clock to 8:30 and 19:00 to 21:00, but within the work time (8:30 to 19:00) ) Better quality. Such a transient phenomenon occurs because a change in communication quality gradually appears due to the worker gradually going to and leaving the office during a certain time period. In the method of switching the path by measuring the amount of fluctuation of the communication quality, it is possible to switch the path by predicting the deterioration of the communication quality by detecting the above-described transient phenomenon of the communication quality.

また上記無線通信環境の変動を予測するステップ９０００や通信品質を推定するステップ９００１において、システム管理者が運用計画入力装置２２を用いて無線サービスエリア内の運用計画に関する情報を通信品質推定装置２３へ入力し、通信品質の変動を予測しても良い。例えば時間帯ごとの人員配置，車両移動，荷物搬入の予定が分かっている場合、過去にそのサービスエリア内で類似の状況が発生していれば、通信品質格納装置２１に格納している情報を元に、その際の通信品質と同程度の通信品質が予定時間に得られると予測できる。またレイトレース法やＦＤＴＤ法（時間領域差分法）といった電波伝搬シミュレータを用い、予定した計画が実施された場合の通信環境を計算機上でモデル化してシミュレーションを実施し、通信品質を推定しても良い。運用計画入力装置２２には、作業者や車両の入退場管理システム，荷物搬入管理システム，侵入監視システムなど他システムから得られた情報を入力し、通信品質推定装置２３により通信品質の変動発生を予測しても良い。   In step 9000 for predicting the change in the wireless communication environment and in step 9001 for estimating communication quality, the system administrator uses the operation plan input device 22 to send information related to the operation plan in the wireless service area to the communication quality estimation device 23. It is also possible to input and predict fluctuations in communication quality. For example, if the schedule of personnel allocation, vehicle movement, and baggage delivery is known for each time zone, if a similar situation has occurred in the service area in the past, the information stored in the communication quality storage device 21 is stored. Originally, it can be predicted that a communication quality equivalent to the communication quality at that time can be obtained at the scheduled time. In addition, using radio wave propagation simulators such as the ray tracing method and the FDTD method (time domain difference method), the communication environment when a planned plan is implemented is modeled on a computer and a simulation is performed to estimate the communication quality. good. Information obtained from other systems such as an operator / vehicle entrance / exit management system, a cargo carry-in management system, and an intrusion monitoring system is input to the operation plan input device 22, and the communication quality estimation device 23 generates fluctuations in communication quality. You may predict.

中央サーバ２は、上記の中継経路を導出するステップ９００２において、通信品質の推定するステップ９００１において推定された各時間帯の通信品質として通信帯域，受信電力，ＢＥＲ，ＰＥＲ，パケット到達率の少なくとも一つを評価値として利用し、経路導出装置２４を用いて適切な中継経路を導出しても良い。中継経路の評価手法の一例として、パケット到達率の推定値を用いる方法を図９に示す。ここでｐXY（ｔ）は、時間ｔにおいて無線局Ｘが送信したパケットが無線局Ｙに到達する確率（時間ｔにおけるパケット到達率）を意味する。無線局Ａから無線局Ｂへのパケット到達率ｐAB（ｔ）は、その中継経路の構成によって値が求められる。無線局Ｃが無線局ＡとＢの通信を中継する場合、ｐAB（ｔ）は〔数式１〕となる。また、無線局Ｃを介する経路と無線局Ｄを介する経路の２経路が存在する場合、ｐAB（ｔ）は〔数式２〕となる。上記計算式を用いることで、任意の中継経路におけるパケット到達率が計算できる。各無線局間のパケット到達率は一般的に時間によって変動するため、同一の中継経路であってもその通信品質は変動する。中継経路を導出するステップ９００２では、中継する通信に求められる最低限の通信品質を満足する中継経路を適切な経路として導出する。 In step 9002 for deriving the relay route, the central server 2 determines at least one of the communication band, received power, BER, PER, and packet arrival rate as the communication quality in each time period estimated in step 9001 for estimating the communication quality. One may be used as an evaluation value, and an appropriate relay route may be derived using the route deriving device 24. As an example of the evaluation method of the relay route, a method using the estimated value of the packet arrival rate is shown in FIG. Here, p XY (t) means the probability (packet arrival rate at time t) that a packet transmitted by the wireless station X at time t will reach the wireless station Y. The value of the packet arrival rate p AB (t) from the wireless station A to the wireless station B is determined by the configuration of the relay route. When the wireless station C relays the communication between the wireless stations A and B, p AB (t) becomes [Formula 1]. In addition, when there are two routes, ie, a route through the wireless station C and a route through the wireless station D, p AB (t) is expressed by [Expression 2]. By using the above formula, the packet arrival rate in any relay route can be calculated. Since the packet arrival rate between radio stations generally varies with time, the communication quality varies even with the same relay route. In step 9002 for deriving a relay route, a relay route that satisfies the minimum communication quality required for relayed communication is derived as an appropriate route.

〔数式１〕
ｐAB(ｔ)＝ｐAC(ｔ)ｐBC(ｔ)
〔数式２〕
ｐAB(ｔ)＝１−{１−ｐAC(ｔ)ｐBC(ｔ)}{１−ｐAD(ｔ)ｐBD(ｔ)}
＝ｐAC(ｔ)ｐBC(ｔ)＋ｐAD(ｔ)ｐBD(ｔ)
−ｐAC(ｔ)ｐBC(ｔ)＋ｐAD(ｔ)ｐBD(ｔ) [Formula 1]
p AB (t) = p AC (t) p BC (t)
[Formula 2]
p AB (t) = 1- {1-p AC (t) p BC (t)} {1-p AD (t) p BD (t)}
= P AC (t) p BC (t) + p AD (t) p BD (t)
-P AC (t) p BC (t) + p AD (t) p BD (t)

中央サーバ２は、上記の中継経路を導出するステップ９００２において、中継経路を利用した場合の通信コストとして通信遅延時間，経由する無線局数，消費電力を評価値として用いても良い。要求される通信品質を満たす中継経路が複数存在した場合、通信コストが低い経路を選択することで、運用コストの低い無線通信システムが構築できる。   In step 9002 for deriving the relay route, the central server 2 may use the communication delay time, the number of wireless stations passed through, and the power consumption as the evaluation value as the communication cost when the relay route is used. When there are a plurality of relay routes satisfying the required communication quality, a wireless communication system with a low operation cost can be constructed by selecting a route with a low communication cost.

中央サーバ２は、上記の中継経路を導出するステップ９００２において、中継経路の耐故障性を評価値として用いても良い。故障の種類としては、単一無線局の故障，一定範囲内に存在する無線局の故障がある。単一無線局の故障とは、解析領域２００内に存在する無線局のどれか１つの無線局との無線通信の通信品質がある閾値以下にまで劣化した場合を指す。中継経路の単一耐故障性を評価する方法として、ある無線局から他無線局への通信のパケット到達率を０から１まで変化させ、その中継経路全体のパケット到達率の変動量を評価指標として用いても良い。一定範囲内に存在する無線局の故障とは、地震や火事などの災害により一定範囲内の無線局が物理的に破壊された状況や、干渉波の発生により一定範囲内の無線局が通信障害を起こした状況を指す。以下では、図１０のような位置に５台の無線局Ａ，Ｂ，Ｃ，Ｄ，Ｅおよび障害物であるオブジェクト２１０が存在する場合における一定範囲内の故障について説明する。無線局Ａから無線局Ｄへの中継経路として、無線局Ａ→Ｂ→Ｄ，Ａ→Ｃ→Ｄ，Ａ→Ｅ→Ｄの３経路が存在する。これら３経路のうち、２つの経路を用いて中継経路を構成する場合、無線局Ｂ，Ｃは無線局Ｅと比べて無線局Ｄの近くに存在するため、例えば特許文献２記載の手法ではこの２経路が選択される。しかし一定範囲内の故障を考慮した場合、無線局Ｂ，Ｃは設置位置が近いため、障害や災害の発生等により同時に通信品質が劣化する可能性が高い。よって、中継経路に存在する無線局の距離関係を耐故障性の評価値として用いても良い。また、図１１のような位置に無線局Ａ，Ｂ，Ｃ，Ｄ，Ｅおよび障害物が存在する場合を考える。無線局Ａから無線局ＢおよびＣへ送信された無線通信は、障害物により無線局Ａ→ＢおよびＡ→Ｃの電波伝搬路が遮蔽され、同時にパケット到達率が劣化する。この２経路で経路多重化した場合、多重化しているにも関わらず１つの障害物に妨害されやすい構成となっている。これは、無線局Ａから無線局ＢおよびＣへの電波伝搬路の射出角度が近いため、障害物の遮蔽により２経路の通信品質が同時に劣化する可能性が高くなっている。よって中継経路内で利用される無線局や電波伝搬路の位置関係を耐故障性の評価値として用いても良い。例えば図１１の配置では、無線局Ａから無線局Ｂを直線で結んだ線分ベクトルＡＢ（→）と、無線局Ａから無線局Ｃを直線で結んだ線分ベクトルＡＣ（→）と、無線局Ａから無線局Ｅを直線で結んだ線分ベクトルＡＥ（→）を求め、それぞれの内積（ベクトルＡＢ（→）・ベクトルＡＣ（→），ベクトルＡＢ（→）・ベクトルＡＥ（→），ベクトルＡＣ（→）・ベクトルＡＥ（→））を評価値として用いても良い。電波伝搬路の算出やパケット到達率の評価，干渉波や障害物による影響範囲の推定は、電波伝搬シミュレータを用いても良い。   The central server 2 may use the fault tolerance of the relay route as an evaluation value in step 9002 for deriving the relay route. Types of failure include failure of a single wireless station and failure of a wireless station existing within a certain range. The failure of a single radio station refers to the case where the communication quality of radio communication with any one of the radio stations existing in the analysis area 200 has deteriorated to a certain threshold value or less. As a method of evaluating the single fault tolerance of a relay route, the packet arrival rate of communication from one wireless station to another wireless station is changed from 0 to 1, and the amount of fluctuation of the packet arrival rate of the entire relay route is used as an evaluation index. It may be used. A failure of a radio station within a certain range is a situation in which a radio station within a certain range is physically destroyed by a disaster such as an earthquake or fire, or a radio station within a certain range is faulty due to the occurrence of an interference wave. Refers to the situation that caused Hereinafter, a failure within a certain range when there are five radio stations A, B, C, D, E and an object 210 as an obstacle at the position as shown in FIG. 10 will be described. As relay routes from the wireless station A to the wireless station D, there are three routes of wireless stations A → B → D, A → C → D, and A → E → D. Of these three routes, when the relay route is configured using two routes, the wireless stations B and C exist closer to the wireless station D than the wireless station E. Two routes are selected. However, considering failures within a certain range, the radio stations B and C are close to the installation positions, so there is a high possibility that the communication quality deteriorates simultaneously due to the occurrence of a failure or disaster. Therefore, the distance relationship between the radio stations existing on the relay route may be used as an evaluation value for fault tolerance. Further, consider a case where wireless stations A, B, C, D, E and obstacles exist at positions as shown in FIG. In the wireless communication transmitted from the wireless station A to the wireless stations B and C, the radio wave propagation paths of the wireless stations A → B and A → C are shielded by the obstacle, and at the same time, the packet arrival rate deteriorates. When these two paths are multiplexed, it is easy to be disturbed by one obstacle despite being multiplexed. This is because the emission angle of the radio wave propagation path from the wireless station A to the wireless stations B and C is close, and there is a high possibility that the communication quality of the two paths deteriorates simultaneously due to obstruction. Therefore, the positional relationship between radio stations and radio wave propagation paths used in the relay path may be used as an evaluation value for fault tolerance. For example, in the arrangement of FIG. 11, a line segment vector AB (→) connecting the wireless station A to the wireless station B with a straight line, a line segment vector AC (→) connecting the wireless station A to the wireless station C with a straight line, A line segment vector AE (→) obtained by connecting the radio station E with the straight line from the station A is obtained, and the inner product (vector AB (→), vector AC (→), vector AB (→), vector AE (→), vector AC (→) · vector AE (→)) may be used as the evaluation value. A radio wave propagation simulator may be used to calculate the radio wave propagation path, evaluate the packet arrival rate, and estimate the range of influence due to interference waves and obstacles.

上記の中継経路を導出するステップ９００２において、通信品質，通信コスト，耐故障性を１つ以上評価値として用いても良い。経路導出装置２４は、中継する通信に求められる最低限の通信品質を達成する中継経路のうち、通信コストが低く、耐故障性が高い経路を適切な経路として導出する。各評価値は通信内容の緊急性や重要性に応じて重み付けしても良い。   In step 9002 for deriving the relay route, one or more communication quality, communication cost, and fault tolerance may be used as evaluation values. The route deriving device 24 derives, as an appropriate route, a route with low communication cost and high fault tolerance among relay routes that achieves the minimum communication quality required for relayed communication. Each evaluation value may be weighted according to the urgency or importance of the communication content.

無線局１は無線通信を行う際、そのときの送信先や通信環境に応じて無線送受信装置１１の無線パラメタとしてアンテナ方向，アンテナチルト角，アンテナ指向性，送信出力，変調方式，通信帯域の少なくとも一つを調整，変更しても良い。無線局１が通信品質測定値を中央サーバ２へ送信する場合、測定の際に設定していた無線パラメタの情報を含んでも良い。また、中央サーバ２は中継経路や時間帯において各無線局が設定すべき無線パラメタを導出し、各無線局へ通知する中継経路に関する情報に該無線パラメタの情報を含んでも良い。   When the wireless station 1 performs wireless communication, the wireless parameters of the wireless transmission / reception apparatus 11 according to the transmission destination and communication environment at that time are at least antenna direction, antenna tilt angle, antenna directivity, transmission output, modulation method, and communication band. One may be adjusted or changed. When the wireless station 1 transmits the communication quality measurement value to the central server 2, the wireless station 1 may include information on the wireless parameter set at the time of measurement. Further, the central server 2 may derive a radio parameter to be set by each radio station in the relay route or time zone, and may include information on the radio parameter in information on the relay route notified to each radio station.

中央サーバ２や無線局１が、ある通信環境内に存在する無線局１の適切な中継経路を求める手法として、電波伝搬シミュレータを用いても良い。設置された無線局や建築物の位置を電波伝搬シミュレータへ入力し、無線局より発信される電波の電波伝搬経路，受信電界強度，遅延プロファイル，到来角度などを推定する。電波伝搬シミュレーションを行う手法として、レイトレース法が一般に利用されている。例えばレイトレース法の一つであるレイラウンチ法では、伝搬経路を探索するために送信機からΔθで光線（レイ）を離散的に放射し、障害物で反射・透過・回折を繰り返しながら送信波をトレースする。推定した伝搬経路や受信電界強度などの情報を元に、所望の通信品質を実現するための適切な中継経路を決定する。   A radio wave propagation simulator may be used as a method for the central server 2 and the wireless station 1 to obtain an appropriate relay route of the wireless station 1 existing in a certain communication environment. The position of the installed radio station or building is input to the radio wave propagation simulator, and the radio wave propagation path, received electric field strength, delay profile, arrival angle, etc. of the radio wave transmitted from the radio station are estimated. The ray tracing method is generally used as a technique for performing radio wave propagation simulation. For example, in the ray launch method, which is one of the ray tracing methods, light rays (rays) are discretely emitted from a transmitter at Δθ in order to search for a propagation path, and a transmitted wave is generated while repeating reflection, transmission, and diffraction by an obstacle. Trace. Based on information such as the estimated propagation path and the received electric field strength, an appropriate relay path for realizing the desired communication quality is determined.

中央サーバ２は、無線局１へ中継情報を通知するステップ９００３において、中継経路を導出するステップ９００２において経路導出装置２４を用いて導出された中継経路に関する情報を、ネットワーク３を通して各無線局１へ通知する。ネットワーク３は、無線通信、もしくは有線ケーブルによるネットワークを指す。また、システム管理者は中央サーバ２が導出した中継経路に関するデータをＵＳＢメモリやＣＤ−ＲＯＭなど外部記録メディアに記録して無線局１へ運ぶ、もしくは手動で無線局１へ中継経路に関するデータを直接入力することで、中央サーバ２から無線局１へのデータ送信を行っても良い。同様に、無線局１から中央サーバ２へ測定値や経路切り替えに関する情報を送付する場合、システム管理者は無線局１が保持する該データを外部記録メディアに中央サーバ２へ運ぶ、もしくは手動で中央サーバ２へ該データを直接入力しても良い。   In step 9003 of notifying the relay information to the wireless station 1, the central server 2 sends the information on the relay route derived using the route deriving device 24 in step 9002 of deriving the relay route to each wireless station 1 through the network 3. Notice. The network 3 indicates a network using wireless communication or a wired cable. Further, the system administrator records the data related to the relay route derived by the central server 2 on an external recording medium such as a USB memory or a CD-ROM and carries the data to the wireless station 1 or directly sends the data related to the relay route to the wireless station 1 directly. By inputting, data transmission from the central server 2 to the wireless station 1 may be performed. Similarly, when sending information on measurement values and path switching from the wireless station 1 to the central server 2, the system administrator carries the data held by the wireless station 1 to an external recording medium to the central server 2, or manually performs central processing. The data may be directly input to the server 2.

中央サーバ２は、通信品質格納装置２１に格納している情報、およびステップ９０００，９００１，９００２，９００３において処理した内容を状態表示装置２５に表示する。表示する処理内容は、通信品質格納装置２１が保持する通信品質測定値，通信品質推定装置２３が導出した通信品質推定値，経路導出装置２４が導出した中継経路情報に関する情報を含んでも良い。ステップ９００１において通信品質を推定し、現在の無線局の性能や配置では必要な通信品質が提供できないと推定される場合、状態表示装置２５はアラームを出してシステム管理者に警告しても良い。アラームは、所望の通信品質が得られない時間帯，推定される通信品質，障害の原因，障害への対策を含んでも良い。所望の通信品質が得られない時間帯に関する情報は、上記無線通信環境の変動を予測するステップ９０００において求められた変動情報を含む。推定される通信品質に関する情報は、上記通信品質を推定するステップ９００１において求められた通信品質情報を含む。障害の原因に関する情報は、所望の通信品質が得られない原因となる中継経路、および該中継経路において通信品質が劣化する原因となる無線局１の識別情報，位置，適用する無線パラメタに関する情報を含んでも良い。また障害の原因に関する情報として、障害が発生する時間帯における運用計画に関する情報を含んでも良い。障害への対策として、運用計画の調整，アンテナ設置位置の調整値，新規無線局の追加配置の少なくとも一つに関する情報を含んでも良い。例えば図１２に示す表示画面３００を上記アラームの表示としても良い。当初計画を表示する画面３０１では、無線局１やオブジェクト２１０の配置，利用する経路，要求されるパケット到達率を実現できないと予想される中継経路が存在する場合、該障害が発生する予想時間，該障害が発生する経路，予想されるパケット到達率，該障害が発生する原因が中央サーバ２の状態表示装置２５に表示される。上記表示と併せて、当初計画からの変更を提案する画面３０２では、該障害が発生した場合の対策として、原因となるオブジェクトの移動先候補範囲３０３、および対策実施時に予想されるパケット到達率を表示しても良い。オブジェクトの移動先候補３０３は、無線局１の配置や周辺物のモデルを作成して電波伝搬シミュレーションを行うことで導出しても良い。周辺物のモデルは運用計画入力装置２２による入力情報を用いても良い。   The central server 2 displays the information stored in the communication quality storage device 21 and the contents processed in steps 9000, 9001, 9002, and 9003 on the status display device 25. The processing content to be displayed may include information on the communication quality measurement value held by the communication quality storage device 21, the communication quality estimation value derived by the communication quality estimation device 23, and the relay route information derived by the route derivation device 24. In step 9001, the communication quality is estimated, and if it is estimated that the required communication quality cannot be provided by the current performance and arrangement of the radio station, the status display device 25 may issue an alarm to warn the system administrator. The alarm may include a time period when the desired communication quality cannot be obtained, an estimated communication quality, a cause of the failure, and a countermeasure for the failure. The information regarding the time period when the desired communication quality cannot be obtained includes the variation information obtained in step 9000 for predicting the variation of the wireless communication environment. The information related to the estimated communication quality includes the communication quality information obtained in step 9001 for estimating the communication quality. The information on the cause of the failure includes a relay route that causes the desired communication quality not to be obtained, and information on the identification information of the wireless station 1 that causes the communication quality to deteriorate in the relay route, the position, and information on the applied wireless parameter. May be included. Further, the information regarding the cause of the failure may include information regarding the operation plan in the time zone where the failure occurs. Information on at least one of adjustment of the operation plan, adjustment value of the antenna installation position, and additional arrangement of new radio stations may be included as countermeasures against the failure. For example, the display screen 300 shown in FIG. 12 may be used as the alarm display. In the screen 301 that displays the initial plan, the location of the wireless station 1 and the object 210, the route to be used, the expected time when the failure occurs when there is a relay route that is expected to be unable to achieve the required packet arrival rate, The path where the failure occurs, the expected packet arrival rate, and the cause of the failure are displayed on the status display device 25 of the central server 2. In addition to the above display, on the screen 302 that proposes a change from the initial plan, as a countermeasure when the failure occurs, the destination candidate range 303 of the cause object and the packet arrival rate expected when the countermeasure is implemented are displayed. You may display. The object destination candidate 303 may be derived by creating a model of the arrangement of the wireless station 1 and peripheral objects and performing a radio wave propagation simulation. Input information from the operation plan input device 22 may be used as the peripheral object model.

実施例１においては、各無線局が発信する通信の通信品質より通信環境の変動発生を検知・推定するが、カメラを用いた画像認識手法やミリ波，レーザによる測定，オブジェクトや無線局が保持するＧＰＳ受信機（Global Positioning System）による位置情報取得、各オブジェクトに設置した無線局が発信する電波強度による位置推定、および各手法を組み合わせた手法に基づいた検知，推定を行っても良い。   In the first embodiment, the occurrence of fluctuations in the communication environment is detected and estimated based on the communication quality of the communication transmitted by each wireless station, but the image recognition method using a camera, measurement using millimeter waves and lasers, the object and the wireless station hold Position information acquisition by a GPS receiver (Global Positioning System), position estimation based on radio wave intensity transmitted from a radio station installed in each object, and detection and estimation based on a combination of the techniques may be performed.

例えば画像認識手法では、カメラに写る物体の画像情報を元に、該物体の位置や形状，種類を検知する。プラント内に設置されている監視カメラを利用して画像認識による物体検知を行い、その検知情報を元に変動発生を推定することで、変動に応じた適切な中継経路を導出するステップ９００２を実施しても良い。例えば状態表示装置２５は通信品質の測定値が閾値以上である場合に変動が発生すると判定するが、サービスエリア内を写すカメラが設置されていれば、該エリアの範囲がより詳細に推定され、作業者の人数や移動経路，荷物搬入量やそのタイミングなどを知ることができるため、変動発生の判定精度が向上する。   For example, in the image recognition method, the position, shape, and type of an object are detected based on the image information of the object captured by the camera. Step 9002 is performed in which an object is detected by image recognition using a surveillance camera installed in the plant, and an appropriate relay route corresponding to the change is derived by estimating the occurrence of the change based on the detected information. You may do it. For example, the state display device 25 determines that the fluctuation occurs when the measured value of the communication quality is equal to or greater than the threshold value, but if a camera that captures the service area is installed, the range of the area is estimated in more detail. Since it is possible to know the number of workers, the movement route, the amount of baggage carried in, and the timing thereof, the determination accuracy of occurrence of fluctuation is improved.

プラント計装無線システムや無線を用いた列車制御システム（ＣＢＴＣ：Communication Based Train Control）において、通信品質の変動発生予測手法と無線局を連携することにより、無線環境を自律的に制御するシステムの構築に適用できる。   In plant instrumentation radio systems and radio train control systems (CBTC: Communication Based Train Control), the construction of a system that autonomously controls the radio environment by linking communication quality fluctuation occurrence prediction methods and radio stations Applicable to.

１ 無線局
２ 中央サーバ
３ ネットワーク
１１ 無線送受信装置
１２ 通信品質測定装置
１３ 中継制御装置
１４ アンテナ
２１ 通信品質格納装置
２２ 運用計画入力装置
２３ 通信品質推定装置
２４ 経路導出装置
２５ 状態表示装置
２００ 解析領域
９０００ 環境変動予測手順
９００１ 通信品質推定手順
９００２ 中継経路導出手順
９００３ 無線局通知手順 DESCRIPTION OF SYMBOLS 1 Radio station 2 Central server 3 Network 11 Wireless transmission / reception apparatus 12 Communication quality measurement apparatus 13 Relay control apparatus 14 Antenna 21 Communication quality storage apparatus 22 Operation plan input apparatus 23 Communication quality estimation apparatus 24 Route derivation apparatus 25 Status display apparatus 200 Analysis area 9000 Environmental change prediction procedure 9001 Communication quality estimation procedure 9002 Relay route derivation procedure 9003 Radio station notification procedure

Claims (10)

第１の無線局と第２の無線局とが中継経路を介して通信する通信システムにおいて、前記中継経路を構成する無線中継局が選択可能に構成されてるものであって、前記通信に影響を与える構造物の時間に対する位置的変位を推定する推定部と、前記推定部の推定に基づいて前記無線中継局を選択する選択部を有することを特徴とする無線通信システム。   In a communication system in which a first radio station and a second radio station communicate via a relay path, the radio relay station constituting the relay path is configured to be selectable, and the communication is affected. A radio communication system comprising: an estimation unit that estimates a positional displacement of a given structure with respect to time; and a selection unit that selects the radio relay station based on the estimation by the estimation unit. 請求項１において、物体の移動或いは構造物の変化等の運用計画に関する情報を記憶する記憶部を有し、前記記憶部の記憶情報に基づいて、前記推定がなされることを特徴とする無線通信システム。   The wireless communication according to claim 1, further comprising: a storage unit that stores information relating to an operation plan such as movement of an object or a change in a structure, and the estimation is performed based on the storage information of the storage unit. system. 請求項１又は２において、前記位置的変位に応じて通信品質を推定する品質推定部を有し、前記無線中継局の選択は、前記通信品質に基づいてなされることを特徴とする無線通信システム。   The radio communication system according to claim 1, further comprising a quality estimation unit that estimates communication quality according to the positional displacement, wherein the selection of the radio relay station is made based on the communication quality. . 前記無線中継局選択の情報は前記選択された中継局に通知されることを特徴とする無線通信システム。   The radio communication system according to claim 1, wherein the radio relay station selection information is notified to the selected relay station. 請求項１乃至４のいずれかにおいて、現在の時刻を取得する時間測定部を有し、該中継制御装置は時間測定装置より取得した時間に応じて中継経路の切り替えを行うことを特徴とする無線通信システム。   5. The radio according to claim 1, further comprising a time measuring unit that acquires a current time, wherein the relay control device performs switching of a relay route according to the time acquired from the time measuring device. Communications system. 請求項１乃至５のいずれかにおいて、通信品質の測定値を元に経路を切り替えるタイミングを判定する通信品質判定部を有し、通信品質判定部より取得した経路切り替えのタイミングに応じて中継経路の切り替えを行うことを特徴とする無線通信システム。   The communication quality determination unit according to claim 1, further comprising: a communication quality determination unit that determines a timing for switching a route based on a measurement value of communication quality, and determines a relay route according to the route switching timing acquired from the communication quality determination unit. A radio communication system characterized by switching. 請求項１乃至６のいずれかに、通信品質推定部は電波伝搬シミュレーション機能を備え、運用計画入力装置により入力された情報を元に電波伝搬シミュレーションを行い、通信品質を推定する機能を有することを特徴とする無線通信システム。   The communication quality estimation unit according to any one of claims 1 to 6, having a radio wave propagation simulation function, having a function of performing a radio wave propagation simulation based on information input by an operation plan input device and estimating communication quality. A wireless communication system. 請求項１乃至７のいずれかにおいて、経路導出装置は電波伝搬シミュレーション機能を備え、運用計画入力装置や通信品質推定装置により入力された情報を元に電波伝搬シミュレーションを行い、中継経路の耐故障性を評価する機能を有することを特徴とする無線通信システム。   8. The route deriving device according to claim 1, wherein the route deriving device has a radio wave propagation simulation function, performs radio wave propagation simulation based on information input by the operation plan input device and the communication quality estimation device, and improves fault tolerance of the relay route. A wireless communication system having a function of evaluating. 請求項１乃至８のいずれか５において、中継経路の切り替えだけでは所望の通信品質が得られない場合、アラームとして、所望の通信品質が得られない時間帯，推定される通信品質，障害の原因，障害への対策の少なくとも１つを表示する前記表示部を有することを特徴とする無線通信システム。   9. In any one of claims 1 to 8, when a desired communication quality cannot be obtained only by switching a relay route, a time zone in which the desired communication quality cannot be obtained, an estimated communication quality, and a cause of failure as an alarm A wireless communication system comprising the display unit that displays at least one of countermeasures against a failure. 通信に影響を与える構造物の時間に対する位置的変位を推定し、前記推定部の推定に基づいて中継経路を構成する無線中継局を選択し、所定の無線局との間で前記選択された無線中継局を介して通信する無線通信方法。   Estimating a positional displacement of a structure that affects communication with respect to time, selecting a radio relay station that constitutes a relay path based on the estimation of the estimation unit, and selecting the selected radio station with a predetermined radio station A wireless communication method for communicating via a relay station.
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