JP4611973B2 - 通信システムにおけるリバースリンクのデータ速度を制御するための方法および装置 - Google Patents
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Description
本特許出願は、暫定的な出願60/448269(名称:リバースリンクデータ通信、出願日:2003年2月18日)と、60/469376(名称:通信システムにおけるリバースリンクのデータ速度を制御するための方法および装置、出願日:2003年5月9日)とに対する優先権を主張するものであり、本出願の譲受人に譲渡され、参照により本明細書に組み込まれている。
本発明は概して通信分野に関連し、より詳細には、通信システムにおける移動局からのリバースリンクのデータ速度(data rate)を制御することに関する。
無線通信システムにおいて、ユーザによる不必要かつ余剰の送信はシステム容量を低減させるだけでなく、他のユーザに対して干渉を引き起こす可能性がある。不必要かつ余剰の送信は、通信システムにおけるリバースリンクのデータ速度の選択が非効率的であった場合に引き起こされる。2つのエンドユーザ間で通信されるデータは、当該システムを介してデータが正しく流れることを確実にするために、いくつかのプロトコルレイヤを通過する。通常では、移動局は、リバースリンクを介した送信のためのアプリケーションからデータブロックを受信する。データブロックは多数のフレームに分割されて通信リンクを介して送信される。少なくとも1つの側面における適正なデータの配送は、各データフレーム内のエラーを検査して、当該データフレーム内に許容できないエラーあるいはエラー速度が検出されたならば、同じデータフレームの再送を要求するといったシステムによって確実にされる。データブロックは任意の種類であり、例えば音楽データ、映像データ、などである。データブロックはサイズが異なっており、配送要求も異なっている。そのような配送要求はしばしばサービス品質に関連している。サービス品質は、通信データ速度、当該サービスが許容可能なパケット損失の速度、データ配送時の時間遅延の堅牢度、データ通信に対する許容できる最大遅延、によって測定される。しばしば、送信のために選択されたデータ速度が十分でなかったならば、要求されたパケット損失と通信遅延パラメータは達成されないであろう。
以下に記載される1つまたはそれ以上の例示的な実施形態はデジタル無線データ通信システムを例にとって説明する。この例で用いることが望ましいが、他の環境あるいは構成では本発明の他の実施形態が組み込まれることは勿論である。概して、ここで述べられる種々のシステムは、ソフトウェア制御によるプロセッサ、集積回路、あるいは離散ロジックを用いて実現される。アプリケーション全体において参照されるデータ、指令、命令、情報、信号、符号、チップは、電圧、電流、電磁波、磁界あるいは磁気粒子、光場あるいは光粒子、あるいはそれらの組み合わせによって表示される。
xi = si/Rk(i)(T0) (1)
パケットはその期限の順番に配置されたので、パケットPiは、
zi = t0+Σsi/Rk(i)(T0)、ここで和は[1、…、i]以上である (2)
において、その送信を完了する。
zi > di (但し、1≦i≦N (3)
MSがキュー内の任意のパケットが現在の速度で期限を見逃してしまうと決定したならば、そのQoSを満足するためにより高い速度が要求される。注意:そのようなデータ速度計算は、MSキュー内の全てのパケットに関連する期限情報を使用する。BSは、バックログとQoSクラスのみに基づいてそのようなデータ速度に関する決定を行うことができない。
これらの完了時間は、以下の式を用いて以前のパケット完了時間から計算可能である。
−1/Rk(i)(T0)] (5)
次に、サイズsnewの新たなパケットPnew、サービスk(new)及び期限dnewが時間t2に到着することを仮定する。概して、新たなパケットに対する期限は、パケットk及びk+1に対する(順序良く配置された)複数の期限の間に存在する。すなわち、あるk<Nに対して、dk≦dnew≦dk+1である。この場合、i≦kならば、zi(t2)は変化しない。T/P値がT1が変化しないならば、
zi (t2) = zi (t1)+snew/Rk(new)(T1)、但し、i>k (6)
すなわち、MSは、その要求されたT/P、要求された期間さらには当該キュー内のパケットの送信スケジュールを計算して更新された状態を維持することができる。
・その現在のパケット損失レートが交渉されたパケット損失レートよりも小さいサービスからのパケット
・要求されたT/Pが割り当てられないときに遅延期限を見逃してしまうパケット
欠落の優先度に基づいて、MSは、種々の輻輳レベルで受け入れ可能なQoSを依然として満足しながら、どのパケットが欠落する可能性があるか決定する。MSは次に、これらのパケットをMSキューから除去することによって形成される架空のキューに対して式(1)から(3)を適用して、輻輳T/P値を計算する。ここで、スループット、パケットデータ及びデータブロックは交換可能であることに注意されたし。
xi = si/R0 (7)
パケットはそれらの期限の順に配置されているので、パケットPiは、
zi = t0+Σsi/R0 但し、和は[1、…i]以上である。(8)
すなわち、diに先立つ期限をもつパケットP1,…Pi-1は、Piの前に送信される。
zi > di 但し、1≦i≦N (9)
MSが当該キュー内の任意のパケットがその期限を見逃すと決定した場合には、当該QoSを満足するためにより高いレートが必要になる。そのようなデータ速度計算は、MSキュー内のすべてのパケットに関連する期限情報を使用する。BSは、バックログとQoSクラスのみに基づいてこのレートに関する決定を行うことができない。
これらの完了時間は、以下の式を使用して既出のパケット完了時間から計算することができる。
次に、サイズsnewの新たなパケットPnew及び期限dnewは時間t2に到着することを仮定する。概して、新たなパケットに対する期限は、パケットk及びk+1に対する(順序付けられた)期限の間である。すなわち、あるk<Nにおいて、dk≦dnew<dk+1である。これより、i≦kならば、zi(t2)は変化しない。レートR1が変化しないならば、
zi(t2)=zi(t1)+snew/R1 但し、i>k (12)
すなわち、MSはその要求されたレート、要求された期間及びキュー内のパケットの送信スケジュールを計算して更新を維持することができる。
3 X未満
2 Xよりも大きいが3Xよりも小さい
1 3Xよりも大きいが9Xよりも小さい
0 9Xよりも大きい(すなわち最善の努力)
Xはその値がBSに対して固定であるかあるいはMSごとのサービスの混合によって固定であるシステムパラメータである。
MS 2:Ec_Pilot[2]、現在の許可[2]、要求=01
MS 3:Ec_Pilot[3]、現在の許可[3]、要求=01
MS 4:Ec_Pilot[4]、現在の許可[4]、要求=11
MS 5:Ec_Pilot[5]、現在の許可[5]、要求=00
MS 6:Ec_Pilot[6]、現在の許可[6]、要求=10
上記の例を考慮して、MS4以外のすべてのMSは、要求されたT/Pを満足するために現在の許可よりも高いT/Pを要求する。MS4は現在の許可の減少を割り当てられる。増大の割り当ては、さらなる計算に応じて他のMSに提供されたりされなかったりする。BS資源マネージャは、Ec_Pilotと各MSに対する現在の許可から現在の資源利用を次のように計算することができる。
BSは、現在の許可に関して、増大(アップ調整)あるいは減少(ダウン調整)を許可する。増大あるいは減少は、その値Adjust[i]がそれぞれ(1+a)あるいは(1−a)によって与えられる現在の許可に対する増大因子である。割り当てに従って、更新された資源利用は、
資源利用=ΣEc_Pilot[i]*[Adjust[i]* [現在の許可[i]+1] (14)
として計算される。
+1 移動局がT/Pを構成された量、a(T/Pに従属可能)だけ増大するように指示された場合
−1 移動局がT/Pを構成された量、a(T/Pに従属可能)だけ減少するように指示された場合
0 移動局がT/Pを変化なしに維持するように指示された場合
BSが連続的要求チャネルを信頼性をもって復号しない(例えばリバースパイロットチャネル(R−PICH)が低い電力で受信されかつ、連続的要求チャネルシンボルが消去される)ならば、BSはフォワード許可チャネルシンボルを0に設定する。一方、連続的要求チャネルが信頼性を持って復号されるならば、BSはフォワード許可チャネルシンボルを適切に設定する。
Claims (14)
- 通信システムにおいて、移動局から基地局へのリバースリンク通信のためのデータ速度を決定するための方法であって、
多数の通信サービスのために移動局からの送信のためのデータパケットを決定することと、
前記データパケットの各々の送信期限を決定することと、
前記決定された送信期限に従って、送信のためのキュー内のデータパケットを配置することと、
前記データパケットの各々に対する送信期限を満足する、前記キュー内における前記データパケットの配置に基づいて、前記データパケットの送信のためのデータ速度を決定することと、
前記キュー内における前記データパケットの配置に基づいて、前記データパケットの送信のための前記決定されたデータ速度の使用に対する期間を決定することと、
前記決定されたデータ速度と前記期間とを前記移動局から前記基地局へ通信することと、
前記決定されたデータ速度と期間での前記移動局からの送信のために、利用可能な資源が前記基地局での割り当てを実現できるかどうかを決定することと、を具備する方法。 - 前記データ速度での前記移動局からの送信のために、前記決定された利用可能な資源が前記基地局での割り当てを実現できない場合には、輻輳レベル警告を前記移動局に対して指示すること、をさらに具備する請求項1に記載の方法。
- データパケットの新たなキューを決定するために、前記キュー内における前記データパケットから少なくとも1つのデータパケットを欠落することと、
データパケットの前記新たなキューの送信のために新たなデータ速度を決定することであって、前記新たなデータ速度は前記データ速度よりも低いことと、をさらに具備する請求項2に記載の方法。 - 前記キュー内における前記データパケットの配置に基づいて、データパケットの送信のために前記決定された新たなデータ速度の使用のための新たな期間を決定すること、をさらに具備する請求項3に記載の方法。
- 通信システムにおいて、移動局から基地局へのリバースリンク通信のためにデータ速度を決定するための方法であって、
多数の通信サービスに対して前記移動局からの送信のためのデータパケットを決定することと、
前記データパケットの各々に対する送信期限を決定することと、
前記決定された送信期限に従った送信のために、前記データパケットを多数のキュー配置に配置することと、
前記多数の可能なキュー構成に基づいて前記データパケットの送信のために多数のデータ速度を決定することと、
前記キュー内における前記データパケットの配置に基づいて、前記データパケットの送信のために前記決定された多数のデータ速度の各々の使用のための期間を決定することと、
前記決定された多数のデータ速度と前記期間とを前記移動局から前記基地局へ通信することと、
前記多数のデータ速度と期間のうちの少なくとも1つでの前記移動局からの送信のために、利用可能な資源が前記基地局での割り当てを実現できるかどうかを決定することと、を具備する方法。 - 前記決定された多数のデータ速度は、要求されたデータ速度と、少なくとも1つの輻輳レベルデータ速度とを含む請求項5に記載の方法。
- 前記多数のデータ速度の少なくとも1つでの前記移動局からの送信のために、前記決定された利用可能な資源が前記基地局での割り当てを実現できるときに前記移動局に指示することをさらに具備する請求項5に記載の方法。
- 通信システムにおいて、移動局から基地局へのリバースリンク通信のためにデータ速度を決定するための装置であって、
多数の通信サービスのために移動局からの送信のためのデータパケットを決定する手段と、
前記データパケットの各々の送信期限を決定する手段と、
前記決定された送信期限に従って、前記データパケットを送信のためのキューに配置する手段と、
前記データパケットの各々に対する送信期限を満足する、前記キュー内における前記データパケットの構成に基づいて、前記データパケットの送信のためのデータ速度を決定する手段と、
前記キュー内における前記データパケットの配置に基づいて、前記データパケットの送信のための前記決定されたデータ速度の使用に対する期間を決定する手段と、
前記決定された多数のデータ速度と前記期間とを前記移動局から前記基地局へ通信する手段と、
前記データ速度と期間での前記移動局からの送信のために、利用可能な資源が前記基地局での割り当てを実現できるかどうかを決定する手段と、を具備する装置。 - 前記データ速度での前記移動局からの送信のために、前記決定された利用可能な資源が前記基地局での割り当てを実現できない場合には、輻輳レベル警告を前記移動局に対して指示する手段をさらに具備する請求項8に記載の装置。
- データパケットの新たなキューを決定するために、前記キュー内における前記データパケットから少なくとも1つのデータパケットを欠落する手段と、
データパケットの前記新たなキューの送信のために新たなデータ速度を決定する手段であって、前記新たなデータ速度は前記データ速度よりも低い手段と、をさらに具備する請求項9に記載の装置。 - 前記キュー内における前記データパケットの配置に基づいて、データパケットの送信のために前記決定された新たなデータ速度の使用のための新たな期間を決定する手段をさらに具備する請求項10に記載の装置。
- 通信システムにおいて、移動局から基地局へのリバースリンク通信のためにデータ速度を決定するためのシステムであって、
多数の通信サービスに対して前記移動局からの送信のためのデータパケットを決定する手段と、
前記データパケットの各々に対する送信期限を決定する手段と、
前記決定された送信期限に従った送信のために、前記データパケットを多数のキュー配置に配置する手段と、
前記多数の可能なキュー構成に基づいて前記データパケットの送信のために多数のデータ速度を決定する手段と、
前記キュー内における前記データパケットの配置に基づいて、前記データパケットの送信のために前記決定された多数のデータ速度の各々の使用のための期間を決定する手段と、
前記決定された多数のデータ速度と前記期間とを前記移動局から前記基地局へ通信する手段と、
前記多数のデータ速度のうちの少なくとも1つでの前記移動局からの送信のために、利用可能な資源が前記基地局での割り当てを実現できるかどうかを決定する手段と、を具備する装置。 - 前記決定された多数のデータ速度は、要求されたデータ速度と、少なくとも1つの輻輳レベルデータ速度とを含む請求項12に記載の装置。
- 前記多数のデータ速度の少なくとも1つでの前記移動局からの送信のために、前記決定された利用可能な資源が前記基地局での割り当てを実現できるときに前記移動局に指示する手段をさらに具備する請求項12に記載の装置。
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2004
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Also Published As
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US20150256463A1 (en) | 2015-09-10 |
EP1595419A2 (en) | 2005-11-16 |
JP2006518577A (ja) | 2006-08-10 |
MXPA05008659A (es) | 2005-11-23 |
BRPI0407568A (pt) | 2006-02-14 |
CA2516219A1 (en) | 2004-09-02 |
CA2516219C (en) | 2019-10-29 |
US9998379B2 (en) | 2018-06-12 |
AU2004213980B2 (en) | 2009-08-13 |
KR20050098944A (ko) | 2005-10-12 |
EP1595419B1 (en) | 2019-04-24 |
AU2004213980A1 (en) | 2004-09-02 |
CN1774950B (zh) | 2011-06-29 |
AU2004213980C1 (en) | 2010-01-14 |
TW200423762A (en) | 2004-11-01 |
WO2004075593A3 (en) | 2004-11-11 |
US20040160922A1 (en) | 2004-08-19 |
BRPI0407568B1 (pt) | 2018-06-12 |
WO2004075593A2 (en) | 2004-09-02 |
TWI451786B (zh) | 2014-09-01 |
CN1774950A (zh) | 2006-05-17 |
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