JP2013505656A - 自己組織化無線ネットワークで通信を実行する方法 - Google Patents
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- H04W52/04—TPC
- H04W52/18—TPC being performed according to specific parameters
- H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
- H04W52/267—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account the information rate
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- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
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- H04W52/0219—Power saving arrangements in terminal devices managed by the network, e.g. network or access point is master and terminal is slave where the power saving management affects multiple terminals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/30—TPC using constraints in the total amount of available transmission power
- H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets
- H04W52/367—Power values between minimum and maximum limits, e.g. dynamic range
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Abstract
Description
Claims (16)
- 自己組織化無線ネットワーク、特に、好ましくはIEEE802.11MACプロトコルに基づく車両ネットワークで通信を実行する方法において、前記ネットワークは、それぞれ通信システムを備えた複数のネットワークノードを有し、前記通信システムは、専用無線通信チャネルを介して送信される周期的メッセージを生成し、前記通信システムのそれぞれが、前記周期的メッセージを送信するために特定の送信パラメータ、すなわちメッセージ間隔および送信パワー、を使用し、
前記通信チャネルの最大許容負荷に対する信頼性しきい値が規定され、各ネットワークノードは、自己の周囲のネットワークノードに関する情報を考慮して、前記信頼性しきい値を超えないような、前記メッセージ間隔と前記送信パワーとの間の関係すなわち間隔パワー関係を設定し、各ネットワークノードは、自己の設定した間隔パワー関係を適用して、自己の発信する周期的メッセージの送信パワーおよび/またはメッセージ間隔を調整することを特徴とする、自己組織化無線ネットワークで通信を実行する方法。 - ネットワークノードが間隔パワー関係設定のために考慮する前記情報が、自己の通信範囲内に位置するネットワークノードの個数、および/または、該ネットワークノードによって採用される送信パワーおよび/またはメッセージ間隔のレベルを含むことを特徴とする請求項1に記載の方法。
- 前記間隔パワー関係設定が事前的に実行されることを特徴とする請求項1または2に記載の方法。
- 送信パワーのさまざまなレベルに対して、ネットワークノードは、結果として生じる通信範囲内のすべてのネットワークノードが同一のメッセージ間隔を使用すると仮定した場合に前記信頼性しきい値を超過しないように、採用可能な最小のメッセージ間隔を決定することを特徴とする請求項3に記載の方法。
- 送信パワーの前記レベルが、所定の通信範囲に対応するように較正されることを特徴とする請求項4に記載の方法。
- 前記間隔パワー関係設定が事後的に実行されることを特徴とする請求項1または2に記載の方法。
- ネットワークノードが、前記通信チャネルの輻輳の測定レベルから、および/または、自己の通信範囲内に位置するネットワークノードによって使用される送信パワーおよびメッセージ間隔のレベルから、前記間隔パワー関係を導出することを特徴とする請求項6に記載の方法。
- ネットワークノードの通信システムは、自己の設定した間隔パワー関係に基づいて送信パラメータを調整する際に、前記メッセージ間隔の調整のほうに、より高い優先度を与えることを特徴とする請求項1ないし7のいずれか1項に記載の方法。
- 前記送信パワーをさらに低減させることができない場合に、前記メッセージ間隔を増大させることを特徴とする請求項1ないし8のいずれか1項に記載の方法。
- 前記ネットワークノードが、自己のメッセージ間隔について自己の通信範囲内に位置する他のネットワークノードに通知することを特徴とする請求項1ないし9のいずれか1項に記載の方法。
- 前記ネットワークノードが、自己の通信範囲内に位置する他のネットワークノードの挙動を分析し、該分析の結果に基づいて、自己の設定した間隔パワー関係に基づく自己の送信パワーおよびメッセージ間隔の値の範囲を限定することを特徴とする請求項1ないし10のいずれか1項に記載の方法。
- ネットワークノードが、自己の設定した間隔パワー関係に基づく自己の送信パワーおよびメッセージ間隔の値の範囲を限定するために、自己の通信範囲内に位置する他のネットワークノードによって採用されるメッセージ間隔のうちの最小のメッセージ間隔を使用することを特徴とする請求項1ないし11のいずれか1項に記載の方法。
- ネットワークノードが、自己の設定した間隔パワー関係に基づく自己の送信パワーおよびメッセージ間隔の値の範囲を限定するために、チャネルビジー時間CBTを使用することを特徴とする請求項1ないし12のいずれか1項に記載の方法。
- ネットワークノードによって設定された間隔パワー関係が定期的に更新されることを特徴とする請求項1ないし13のいずれか1項に記載の方法。
- ネットワークノードによって設定された間隔パワー関係は、前記ネットワークノードの通信範囲内に位置するネットワークノードの個数が変化するたびに更新されることを特徴とする請求項1ないし13のいずれか1項に記載の方法。
- 前記信頼性しきい値は、それを超えるとパケット配送信頼性が所定値未満に劣化するようなしきい値として規定されることを特徴とする請求項1ないし15のいずれか1項に記載の方法。
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