JP2013179605A - 無線メッシュ型ネットワークの構成および最適化 - Google Patents
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Abstract
【解決手段】ネットワーク設計ツールは、無線ネットワーク内でのノードおよび機器の追加、除去、および位置決めのための対話式グラフィックインターフェースと、閾値、ネットワークトポロジ選択、経路指定設定、および無線メッシュ型ネットワーク内での通信経路およびスケジュールの生成および最適化に関連するその他の構成パラメータを指定するための複数の対話式画面を含むメニューと、を提供する。ネットワーク設計ツールは、最適化規則の集合をユーザが入力するパラメータと共にネットワークモデルに自動的に適用して効率のよいネットワーク構成データを生成する。
【選択図】図5
Description
ち「ホップ」もまた、部分的な経路指定決定を行い、一般的には、宛先の一般的方向にデータを誘導する。
し、または提供できるようなやり方で、プロセス制御分野に対して適用されてはいない。例えば、特許文献2の各明細書には、一般の無線通信システムに関連する無線通信技術の様々な態様が開示されている。
る形または記号を選択する。加えて、ネットワーク設計ツールは、ユーザが各フィールド機器ごとに、バースト率、すなわち分散制御システム(DCS)または類似の制御ユニットにプロセスデータを報告する頻度を構成することを可能にする。さらに、ネットワーク設計ツールは、無線ネットワーク内の経路指定パスの集合に対応するマスタグラフの先頭に1台または複数のゲートウェイ機器を自動的に配置する。次いでネットワーク設計ツールは、グラフの先頭に対して上流と下流両方の経路指定を定義し、シミュレートし、調整する。この態様では、ネットワーク設計ツールは、HARTプロトコルの無線拡張をサポートするプロセス制御環境で使用するために無線ネットワークを最適化する。
などの指定周波数で、または無線スペクトルの認可不要の部分(2.4GHz)で動作し得ることを当分野の技術者は理解するであろう。本明細書で論じるシステムおよび方法はどんな指定周波数または周波数範囲で動作する無線ネットワークにも適用され得るが、以下で論じる実施形態は、無線スペクトルの認可不要または共用の部分において動作する無線HARTネットワーク14に関するものである。この実施形態によれば、無線HARTネットワーク14は、必要に応じて特定の認可不要の周波数範囲で動作するように容易に作動させ、調整することができる。
続すなわちTDMAを使ってリンク動作をスケジュールするように調停される(ブロック76)。すべての通信は、好ましくは、指定のタイムスロット内で行われる。1台または複数の送信元機器および1台または複数の宛先機器が所与のスロットでやり取りするようにスケジュールされ、各スロットは、ただ1台の送信元機器からの通信に、または複数の送信元機器間のCSMA/CAの様な共用通信アクセスモードに専用で使用される。送信元機器は、特定のターゲット機器にメッセージを送り、またはスロットに割り当てられたすべての宛先機器にメッセージをブロードキャストする。
レームSの相対フレームRは、サイクルCnでは周波数F1で、続くサイクルCn+1では周
波数F5で、サイクルCn+2では周波数F2で、以下同様に発生するようにスケジュールさ
れ得る。ネットワークマネージャ27は、この情報を用いて関係のあるネットワーク機器を、スーパーフレームSで通信を行うネットワーク機器が、スーパーフレームSの現在のサイクルに従って送信または受信の周波数を調整するように構成する。
入力する。その結果、ネットワーク設計ツール45は、電源供給されるネットワークノード3を通る各ホップを、他のすべての要因が同じであれば、電源供給されないネットワークノードを通るホップの3倍好ましいものとみなすようになる。
手順500は、あるネットワーク機器から発するリンクの重みを、そのネットワーク機器が電源供給されているためにセレクタ467を介して入力された係数で乗じる。他方、手順500は、同じネットワーク機器から発する異なるリンクの重みを、このリンクがホップ数で測るとゲートウェイまでのより短い経路の一部であるために増大させる。次いで手順500は、ブロック512で、2つの数値の間の単純比較を実行して、これら2つのリンクの中から選択する。
つで障害が発生し、または第1の経路内のノード対の間に予期しない障害物があっても、必ずしも機器が通信を妨げられるとは限らない。ネットワーク設計ツール45は、対応する記号に着色することによってフィールド機器をゲートウェイまで接続する冗長経路が利用できるかどうかを示す。図12に、図10に示すネットワークモデル324が構築された後に、ユーザが対話式ウィンドウ450を呼び出した後でネットワーク設計ツール300によって生成されるネットワークモデルを示す。詳細には、ユーザは、閾値信号強度セレクタ455を操作して閾値を増やしている。その結果ネットワーク設計ツール450は、重複するリンクの一部を削除しており、記号400は図12では図10と異なる色で表示されている。これに対して、記号426は、記号400をネットワークアクセスポイント記号412に接続する経路内のノードとしても、記号520と記号522を記号412に接続する経路内のノードとしても表示されるため、元の色で表示されている。さらに、図12に示すように、記号422で表わされる機器は、今度は、この機器をその近隣機器に潜在的に接続するリンクのいずれも新しいユーザ要件を満たさないために無線HARTネットワーク14から切断されている。
成、ネットワーク管理構成、ゲートウェイスーパーフレーム構成、および専用スーパーフレーム構成を行うための各手順を含む。
スポイントを追加するといった技術的決定の影響を効率よく正確に評価することができる。前述のように、ユーザは、シミュレートされた各機器をパラメータ表示することもできる。プロセス制御分野に精通していれば、様々な機器は、機器製造者、価格、クラスおよび機器のタイプ、ならびに機器の寿命、機器の電力要件およびいくつかのその他の要因の違いにより、異なる動作パラメータを有することを理解するであろう。よってユーザは、ある物理構成の代替構成との違いを評価することに加えて、一例を挙げると、類似の機能を果たす能力の低い機器の代わりにより能力の高い機器を使用することの影響もさらに評価する。シミュレートされる性能に対する企図される置換の影響を、2つの代替構成の間の価格差や設置の複雑さの違いといった要因を考慮に入れて比較することにより、ユーザは、高度な情報に基づく決定を行い、最終的には、より適切なネットワーク設計に到達する。
本出願は、参照によりその開示が本明細書に明示的に組み込まれる、2007年8月31日に出願した「ワイヤレスメッシュネットワークの構成および最適化(Configuring and Optimizing a Wireless Mesh Network)」という名称の米国仮特許出願第60/969,420号の利益を主張するものである。
Claims (6)
- コンピュータ可読媒体上に命令セットとして格納され、コンピュータがプロセス制御環境で動作する複数の機器を含む通信ネットワークを設計するために実施するように適合されたソフトウェアツールであって、
コンピュータ可読媒体上にデータとして格納される前記通信ネットワークの対話式モデルの作成または変更を円滑に行わせるインターフェースモジュールと、
前記対話式モデルに基づいて前記通信ネットワークを動作させるパラメータ集合を自動的に生成する、前記インターフェースモジュールに通信可能に結合されたエンジンモジュールと、
を備えるソフトウェアツール。 - 前記パラメータ集合が、前記通信ネットワークの経路指定方式と前記複数の機器の通信スケジュールのうちの少なくとも1つと関連付けられる、請求項1に記載のソフトウェアツール。
- 前記エンジンモジュールが、
前記複数の機器のそれぞれと関連付けられ、前記対話式モデルの一部として格納されている少なくとも1つの地理的情報を使用して前記複数の機器の各対間の直接無線接続を定義するグラフ生成器、
を含み、
前記経路指定方式が前記定義される直接無線接続を含む、
請求項2に記載のソフトウェアツール。 - 前記エンジンモジュールが、
前記通信ネットワークの前記経路指定方式を定義するために1つまたは複数の直接無線接続によって前記複数の機器の各対を接続する有向グラフの集合を生成するグラフ生成器、
を含む、
請求項2に記載のソフトウェアツール。 - 前記インターフェースモジュールが、
前記無線通信ネットワークの各ノードに対応する前記対話式モデルの複数のノードにノードを追加するノード追加ルーチンと、
前記複数のノードの中からノードを除去するノード除去ルーチンと、
前記複数のノードのうちの1つを前記複数のノードのうちの少なくとも別の1つに対する地理的位置と関連付けるノード位置決めルーチンと
を含み、
前記ノード追加ルーチン、前記ノード除去ルーチンおよび前記ノード位置決めルーチンがそれぞれユーザ入力に応答するものである、
請求項1に記載のソフトウェアツール。 - 前記インターフェースモジュールが、
前記対話式モデルを、前記エンジンモジュールによって生成される前記パラメータ集合に対応する直接接続の集合によって相互接続された複数のノードとして表示するグラフィカルユーザインターフェース(GUI)ルーチン、
を含む、
請求項1に記載のソフトウェアツール。
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US96942007P | 2007-08-31 | 2007-08-31 | |
US60/969,420 | 2007-08-31 | ||
US12/201,734 | 2008-08-29 | ||
US12/201,734 US9730078B2 (en) | 2007-08-31 | 2008-08-29 | Configuring and optimizing a wireless mesh network |
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GB2485093B (en) | 2012-10-10 |
GB0815878D0 (en) | 2008-10-08 |
JP5241385B2 (ja) | 2013-07-17 |
EP2066142A3 (en) | 2009-08-12 |
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