JP2009284555A - 改善されたサービス品質尺度を介する無線ネットワークでの改善された垂直ローミング - Google Patents
改善されたサービス品質尺度を介する無線ネットワークでの改善された垂直ローミング Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/0005—Control or signalling for completing the hand-off
- H04W36/0083—Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists
- H04W36/0085—Hand-off measurements
- H04W36/0088—Scheduling hand-off measurements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/04—Reselecting a cell layer in multi-layered cells
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/14—Reselecting a network or an air interface
- H04W36/144—Reselecting a network or an air interface over a different radio air interface technology
- H04W36/1446—Reselecting a network or an air interface over a different radio air interface technology wherein at least one of the networks is unlicensed
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/16—Performing reselection for specific purposes
- H04W36/22—Performing reselection for specific purposes for handling the traffic
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Abstract
【解決手段】ネットワークアロケーションベクトル占有およびパケット衝突確率が、サービス品質尺度として使用され、サービス品質に実際に有益になるまで垂直ハンドオフを遅らせることができるようになる。垂直ハンドオフシナリオでの改善された無線ネットワークセル境界検出が、適応的に決定される最小動作信号強度閾値と共にフーリエベース技法を用いて達成される。改善された無線ネットワークセル境界検出は、高サービス品質ネットワークからの垂直ハンドオフをできる限り遅らせることを可能にする。実用的な無線ネットワークサービス品質尺度と垂直ハンドオフシナリオでの無線ネットワークセル境界の改善された検出が一緒になって、不必要な垂直ハンドオフの割合を減らし、無線ネットワークタイプの間でローミングするモバイルコンピューティングデバイスが経験するより高い全体的なサービス品質がもたらされる。
【選択図】図1
Description
Claims (14)
- 無線ネットワークでモバイルコンピューティングデバイスからプロービングデータパケットを送信することと、
前記プロービングデータパケットに基づいて前記無線ネットワークのプロービングデータパケット衝突確率を計算することと、
前記プロービングデータパケット衝突確率に関して無線ネットワークサービス品質尺度を計算することと
を備えることを特徴とするコンピュータ実施された方法。 - 前記プロービングデータパケット衝突確率を計算することは、送信されたプロービングデータパケットの総数に対する肯定応答されなかったプロービングデータパケットの個数の比を計算することを含むことを特徴とする請求項1に記載の方法。
- 前記プロービングデータパケットは、無線Network Driver Interface Specificationに従う無線ネットワークインターフェースによってIEEE 802.11無線ネットワーク標準規格に従って送信され、前記比は、Network Driver Interface Specification Acknowledge Failure Count統計値とTransmitted Fragment Count統計値との合計によってNetwork Driver Interface Specification Acknowledge Failure Count統計値を割ることによって計算されることを特徴とする請求項2に記載の方法。
- 低いプロービングデータパケット衝突確率は、高い無線ネットワークサービス品質尺度に対応し、高いプロービングデータパケット衝突確率は、低い無線ネットワークサービス品質尺度に対応することを特徴とする請求項1に記載の方法。
- 前記無線ネットワークサービス品質尺度は、前記無線ネットワーク内の推定残余帯域幅を含むことを特徴とする請求項4に記載の方法。
- 高いレベルのプロービングデータパケット衝突確率は、前記無線ネットワーク内のゼロの推定残余帯域幅に対応することを特徴とする請求項5に記載の方法。
- 前記無線ネットワークサービス品質尺度は、無線媒体アクセス制御伝送遅延を含むことを特徴とする請求項4に記載の方法。
- プロービングデータパケット衝突確率に関して前記無線ネットワークサービス品質尺度を計算することは、プロービングデータパケット衝突確率対無線ネットワークサービス品質尺度ルックアップテーブルで前記無線ネットワークサービス品質尺度をルックアップすることを含むことを特徴とする請求項1に記載の方法。
- 第2タイプの無線ネットワークでの前記計算された無線ネットワークサービス品質は第1タイプの無線ネットワークでの観察された無線ネットワークサービス品質より高い場合に、前記第1タイプの無線ネットワークから前記第2タイプの無線ネットワークへの垂直ハンドオフを開始することをさらに備えることを特徴とする請求項1に記載の方法。
- 前記第1タイプの無線ネットワークは、無線広域ネットワークを含むことを特徴とする請求項9に記載の方法。
- 前記第2タイプの無線ネットワークは、無線ローカルエリアネットワークを含むことを特徴とする請求項10に記載の方法。
- 前記第2タイプの無線ネットワークは、無線ローカルエリアネットワークを含むことを特徴とする請求項9に記載の方法。
- 前記第2タイプの無線ネットワークへの前記無線ネットワークインターフェースで受信された信号強度が減少していると判定され、前記第2タイプの無線ネットワークへの前記無線ネットワークインターフェースで受信された信号強度のサンプルの算術平均が最小動作信号強度閾値未満である場合に、前記第2タイプの無線ネットワークから前記第1タイプの無線ネットワークへの垂直ハンドオフを開始することをさらに備えることを特徴とする請求項9に記載の方法。
- 請求項1に記載の方法を実行するコンピュータ実行可能命令をその上に有することを特徴とするコンピュータ可読媒体。
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US10/377,494 US6944144B2 (en) | 2003-02-28 | 2003-02-28 | Vertical roaming in wireless networks through improved quality of service measures |
US10/377,494 | 2003-02-28 |
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JP2006508633A Division JP4402689B2 (ja) | 2003-02-28 | 2004-01-29 | 改善されたサービス品質尺度を介する無線ネットワークでの改善された垂直ローミング |
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JP2009284555A true JP2009284555A (ja) | 2009-12-03 |
JP4943481B2 JP4943481B2 (ja) | 2012-05-30 |
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JP2006508633A Expired - Fee Related JP4402689B2 (ja) | 2003-02-28 | 2004-01-29 | 改善されたサービス品質尺度を介する無線ネットワークでの改善された垂直ローミング |
JP2009204473A Expired - Fee Related JP4943481B2 (ja) | 2003-02-28 | 2009-09-04 | 改善されたサービス品質尺度を介する無線ネットワークでの改善された垂直ローミング |
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US (4) | US6944144B2 (ja) |
EP (1) | EP1590897B1 (ja) |
JP (2) | JP4402689B2 (ja) |
KR (1) | KR101069328B1 (ja) |
CN (1) | CN1771676B (ja) |
TW (1) | TWI367645B (ja) |
WO (1) | WO2004079967A2 (ja) |
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CN1771676B (zh) | 2010-10-06 |
JP4402689B2 (ja) | 2010-01-20 |
KR20050115257A (ko) | 2005-12-07 |
TW200501654A (en) | 2005-01-01 |
JP4943481B2 (ja) | 2012-05-30 |
WO2004079967A3 (en) | 2005-01-20 |
EP1590897B1 (en) | 2015-03-11 |
CN1771676A (zh) | 2006-05-10 |
WO2004079967A2 (en) | 2004-09-16 |
US20050250508A1 (en) | 2005-11-10 |
JP2006519569A (ja) | 2006-08-24 |
EP1590897A2 (en) | 2005-11-02 |
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EP1590897A4 (en) | 2010-09-22 |
TWI367645B (en) | 2012-07-01 |
US7499432B2 (en) | 2009-03-03 |
KR101069328B1 (ko) | 2011-10-05 |
US20040170191A1 (en) | 2004-09-02 |
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