JP5461383B2 - 無線通信システムで性能を高める方法及び装置 - Google Patents
無線通信システムで性能を高める方法及び装置 Download PDFInfo
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- H—ELECTRICITY
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- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W36/00—Hand-off or reselection arrangements
- H04W36/06—Reselecting a communication resource in the serving access point
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W36/14—Reselecting a network or an air interface
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- H04W48/00—Access restriction; Network selection; Access point selection
- H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
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- H04W72/00—Local resource management
- H04W72/02—Selection of wireless resources by user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
- H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description
RB(t)=SB(t)[hα(t)α1(t)+hβ(t)β1(t)]
RC(t)=SC(t)[hα(t)α2(t)+hβ(t)β2(t)]
RD(t)=SD(t)[hα(t)α3(t)+hβ(t)β3(t)]
により与えられる。
αk(t)=1
βk(t)=exp(j2πfrott+vk)
であり、ここで、位相ずれ{vk}は[0,2π]内で一様に分布する。この例では、便宜的なビームフォーミングを用いるパイプが存在するので、v1=0,v2=2π/3,v3=4π/3として位相ずれを選択できる。この特定の実施形態は、各々が周波数frotで回転する3つの便宜的なビームをもたらす。一般に、これら位相ずれは、上述したように一様に分布する必要はない。システムをユーザーの特定の空間分布に最適化するため、ビーム間のずれを、遅い速度で変えることさえできる。
Y(t)=h1X1(t)+h2X2(t)+W(t)
Y(t+1)=h1X1(t+1)+h2X2(t+1)+W(t+1)
により表すことができ、このことを、原信号S(t)の観点から
12…基地局
13,15…通信信号
14…移動ノードMN1
16…移動ノードMNN
Claims (32)
- 基地局と無線端末との間で情報を交信するのに用いることができる複数の異なった無線通信チャネルに対する1セットのチャネル品質情報を維持するように前記無線端末を動作するステップであって、前記基地局及び前記無線端末の少なくとも一方が複数のアンテナを含み、前記複数の異なった無線通信チャネルが少なくとも第1の通信チャネル及び第2の通信チャネルを含み、前記第1及び第2の通信チャネルが前記第1及び第2の通信チャネルを確立するために用いられる第1及び第2の送信技術の関数である異なった品質特性をそれぞれ有し、前記第1及び第2の送信技術が異なり、前記少なくとも第1及び第2の通信チャネルに対応するチャネル品質情報が任意のある時点で維持されたものであるステップと、
前記ある時点で維持された前記少なくとも第1及び第2の通信チャネルに対応するチャネル品質情報と並列的に前記無線端末の動きの速度を示す測定値を生成するステップと、
少なくとも前記第1及び前記第2の通信チャネルに対応する前記維持されたチャネル品質情報の関数としておよび前記無線端末の動きの速度を示す測定値の関数として、前記無線端末によって所望されるチャネル選択のための信号を発生させるように前記無線端末を動作するステップと、
前記信号を前記基地局へ送信するステップと、
を有する通信方法。 - 前記信号は少なくとも前記第1及び前記第2の通信チャネルの品質に関する情報を提供する請求項1に記載の通信方法。
- 前記信号に含まれた前記チャネル品質情報の関数として情報を前記無線端末に伝達するのに用いる複数のチャネルを前記複数の通信チャネルのうちから選択するように前記基地局を動作するステップを更に有する請求項2に記載の通信方法。
- 前記第1及び第2の技術は相容れない異なったアクセス技術である請求項1に記載の通信方法。
- 前記異なったアクセス技術はCDMA、OFDM及び狭帯域信号搬送波技術を含む請求項4に記載の通信方法。
- 前記異なったアクセス技術の各々は特定のアクセス技術に準拠する複数の要件を規定する1つの異なった技術規格に対応し、前記異なったアクセス技術は、これら異なったアクセス技術のうちの1つに対応していて他の異なったアクセス技術で規定された要件に反する通信要件を規定する技術規格で示されるように相容れないものである請求項4に記載の通信方法。
- 前記無線端末を動作するステップが、
前記測定値が第1速度の無線端末の動きを示す場合に、第1量の周波数ダイバーシティを前記無線端末へ与える第1の通信技術を選択するステップと、
前記測定値が前記第1速度の無線端末の動きより遅い第2速度の無線端末の動きを示す場合に、前記無線端末から受信したフィードバック情報の関数としてアンテナビームフォーミングを用いる第2の通信技術に対応する通信チャネルを選択するステップと、
を含む請求項1に記載の通信方法。 - 前記無線端末の動きの速度を示す測定値を生成するステップが、前記基地局と前記無線端末との間で送信された信号のドップラー偏移の測定値を生成することを含む請求項1に記載の通信方法。
- 前記無線端末の動きの速度を示す測定値を生成するステップが、クロックタイミングで変化させることを前記無線端末に指示するのに用いられる複数のタイミング制御信号と、前記無線端末から周期的に送信された信号の電力が時間と共に変化する割合、通信チャネルの測定された品質の変化率、およびチャネルフェージング測定値の変化率の3者との少なくとも1つの変化率を測定することを含む請求項1に記載の通信方法。
- 前記無線端末を動作するステップは、
前記測定値が第1速度の無線端末の動きを示す場合に、第2の通信チャネルより高い周波数ダイバーシティ及び時間ダイバーシティの少なくとも1つを提供する第1の通信技術を選択することと、
前記測定値が前記第1速度の無線端末の動きより遅い第2速度の無線端末の動きを示す場合に、前記第1の通信技術に対応する第1の通信チャネルから得られるものより高い空間ダイバーシティを提供する第2の通信技術に対応する第2の通信チャネルを選択することと、
を含む請求項1に記載の通信方法。 - 前記無線端末を動作するステップが、
チャネル状態の変化が急激な速度で生じた場合に、前記複数のチャネル内で選択されていない通信チャネルから得られるどれよりも高い周波数または時間ダイバーシティを提供するチャネルを前記複数のチャネル内で選択することと、
チャネル状態の変化が前記急激な速度より遅い速度であるゆっくりとした速度で生じた場合に、チャネル状態の変化が前記急激な速度で生じた場合において選択した前記チャネルより高い空間ダイバーシティを提供する別の1つのチャネルを前記複数のチャネル内で選択することと、
を含む請求項1に記載の通信方法。 - 前記複数のチャネルが固定である請求項1に記載の通信方法。
- 固定である前記複数の通信チャネルの少なくともいくつかは異なった時点で存在するチャネルの異なった組み合わせを持つ周期的性質にあり、いずれかの時点で存在するチャネルの組み合わせは前記通信チャネルの周期的性質により予測可能である請求項12に記載の通信方法。
- 前記基地局は異なった技術に対応するチャネルの間で資源を予め決定されたスケジュールに基づいて周期的に再割り当てする請求項1に記載の通信方法。
- 前記基地局は異なった技術に対応するチャネルの間で資源を1つ以上の無線端末から受信した信号に基づいて再割り当てする請求項1に記載の通信方法。
- 前記基地局は特定の技術を用いるチャネルに対する要求を示す無線端末からの信号に応答して、特定の技術に対応するチャネルを生成する請求項15に記載の通信方法。
- 前記基地局はチャネルを要求した前記無線端末から受信した少なくとも1つの信号の関数である期間のあいだ、前記生成されたチャネルを維持する請求項16に記載の通信方法。
- 前記基地局が複数のアンテナを含み、前記基地局と相互作用する第1セットの無線端末が複数の受信アンテナを含み、前記基地局と相互作用する第2セットの無線端末が1つのアンテナを含み、複数の受信アンテナを含む無線端末が前記基地局と相互作用するいくつかの時点で、MIMO技術に対応する通信チャネルを用い、前記基地局と相互作用する異なった時点で、1つだけの受信アンテナを必要とする技術に対応するチャネルを用いる請求項1に記載の通信方法。
- 1つだけの受信アンテナを含む無線端末が、複数の受信アンテナを必要としない技術に対応する1つ以上のチャネルを用いて前記基地局と相互作用する請求項18に記載の通信方法。
- 前記無線端末から受信した信号の関数として異なった通信技術を用いる通信チャネルへ前記複数の通信チャネルの1つから通信資源を再割り当てするように前記基地局を動作するステップを更に有する請求項1に記載の通信方法。
- 前記維持されたセットのチャネル品質情報に基づいて複数の通信チャネル間で選択し、これにより、より良い送信特性を前記無線端末へ与える送信技術に対応するチャネルを選択するように前記無線端末を動作するステップを更に有し、
発生させた前記信号がチャネル選択を基地局へ指示する請求項1に記載の通信方法。 - 通信資源の使用を変更するように前記基地局を動作し、前記基地局により受信された情報によって指示されるように前記無線端末により選択された通信チャネルに対応する技術を用いて通信チャネルを生成するのに用いられる資源の量を増大させるステップを更に有する請求項1に記載の通信方法。
- 複数の受信アンテナと、
前記基地局と前記無線端末との間で情報を交信するのに用いることができる複数の異なった無線通信チャネルに対する1セットのチャネル品質情報を維持する手段であって、前記複数の異なった無線通信チャネルが少なくとも第1の通信チャネル及び第2の通信チャネルを含み、前記第1及び第2の通信チャネルが前記第1及び第2の通信チャネルを確立するために用いられる第1及び第2の送信技術の関数である異なった品質特性をそれぞれ有し、前記第1及び第2の送信技術が異なり、前記少なくとも第1及び第2の通信チャネルに対応するチャネル品質情報が任意のある時点で維持されたものである手段と、
前記ある時点で維持された前記少なくとも第1及び第2の通信チャネルに対応するチャネル品質情報と並列的に前記無線端末の動きの速度を示す測定値を生成する手段と、
少なくとも前記第1及び第2の通信チャネルに対応する前記維持されたチャネル品質情報の関数としておよび前記無線端末の動きの速度を示す測定値の関数として、前記無線端末によって所望されるチャネル選択のための信号を発生させる手段と、
前記信号を前記基地局へ送信する送信機と、
を有する無線端末。 - 前記信号は少なくとも前記第1及び前記第2の通信チャネルの品質に関する情報を提供する請求項23に記載の無線端末。
- 前記無線端末は前記第1及び第2の技術を用いて送信された信号を受信できる受信機を含み、前記第1及び第2の技術は相容れない異なったアクセス技術である請求項24に記載の無線端末。
- 前記異なったアクセス技術はCDMA、OFDM及び狭帯域信号搬送波技術の少なくとも2つを含む請求項25に記載の無線端末。
- 前記無線端末は前記第1及び第2の技術を用いて送信された信号を受信できる受信機を含み、前記異なったアクセス技術の各々は特定のアクセス技術に準拠する複数の要件を規定する1つの異なった技術規格に対応し、前記異なったアクセス技術は、これら異なったアクセス技術のうちの1つに対応していて、他の異なったアクセス技術で規定された要件に反する通信要件を規定する技術規格で示されるように相容れないものである請求項24に記載の無線端末。
- 複数の異なった通信チャネルに対応する信号を並列的送信する手段であって、前記通信チャネルの少なくとも2つが、異なったアクセス技術に対応するものである手段と、
少なくとも2つの異なった通信チャネルに対応するチャネル品質情報の関数としておよび前記無線端末の動きの速度を示す測定値の関数として前記無線端末によって所望されるチャネル選択のために発生された信号を無線端末から受信する手段であって、前記2つの異なった通信チャネルが異なった通信技術に対応するものであり、前記少なくとも2つの異なった通信チャネルに対応するチャネル品質情報が任意のある時点で維持されたものであり、前記無線端末の動きの速度を示す測定値は前記ある時点で維持された前記少なくとも第1及び第2の通信チャネルに対応するチャネル品質情報と並列的に生成される手段と、 前記受信した信号の関数としてチャネルセグメントを前記無線端末へ割り当てるチャネルセグメントアロケータと、
を有する基地局。 - 特定の技術に対応するチャネルの選択を指示する無線端末からの受信信号に応答して複数の通信チャネルへの資源の割り当てを制御する資源割り当て制御器を更に有する請求項28に記載の基地局。
- 前記資源割り当て制御器は無線端末により選択された技術を用いて通信チャネルを生成するためにチャネル要求情報に応答するものである請求項29に記載の基地局。
- 前記資源割り当て制御器は、第2の技術を用いる通信チャネルに対する要求が増大した場合に、第1の技術を用いて実施された通信チャネルから、第2の技術を用いる通信チャネルへ資源を再割り当てするもので、前記第1及び第2の通信技術が異なっている請求項29に記載の基地局。
- 前記無線端末から受信した信号の関数として異なった技術を用いて実施された少なくとも2つの異なった通信チャネルに対応するチャネル品質情報の関数として前記無線端末との通信に用いるべきチャネルを選択するチャネル選択手段を更に有し、前記2つの異なった通信チャネルは異なったアクセス技術に対応するようになっている請求項28に記載の基地局。
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JP4740123B2 (ja) | 2011-08-03 |
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HK1146161A1 (en) | 2011-05-13 |
CN1810048A (zh) | 2006-07-26 |
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KR101188396B1 (ko) | 2012-10-08 |
KR20050120806A (ko) | 2005-12-23 |
EP1618748A2 (en) | 2006-01-25 |
JP2014053917A (ja) | 2014-03-20 |
JP5726976B2 (ja) | 2015-06-03 |
EP1618748A4 (en) | 2011-10-19 |
JP2006524966A (ja) | 2006-11-02 |
EP1618748B1 (en) | 2016-04-13 |
US7142864B2 (en) | 2006-11-28 |
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JP2011160417A (ja) | 2011-08-18 |
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