JP4734337B2 - 無線送信装置および無線送信方法 - Google Patents
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- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- 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]
- H04W52/262—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account adaptive modulation and coding [AMC] scheme
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
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- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
- H04L1/0004—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes applied to control information
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- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
- H04L1/0005—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes applied to payload information
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- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0016—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy involving special memory structures, e.g. look-up tables
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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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Computer Networks & Wireless Communication (AREA)
- Quality & Reliability (AREA)
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- Detection And Prevention Of Errors In Transmission (AREA)
- Compression, Expansion, Code Conversion, And Decoders (AREA)
Description
3GPP TS25.211 v6.5.0、2005年6月 3GPP TSG RAN1 R1−050679、2005年6月
、これら2つのチャネルを含んだ送信信号のPAPRは高い値を示し、そのため、送信信号に歪を生じさせないように、送信アンプのバックオフを十分に取る必要があり、総送信電力を下げて送信する必要がある。その結果、これら2つのチャネルの所要品質を満たせなくなり、通信システムのスループットが低下する。
図3は、本発明の実施の形態1に係る無線送信装置を備える通信装置の主要な構成を示すブロック図である。
高速フーリエ変換(IFFT)処理を行い、時間領域信号に変換する。得られた時間領域信号はCP付加部116に出力される。
。
としても良い。また、時分割多重をSCCH、SDCHの順で多重する例を示したが、これに限定されず、例えばSDCH、SCCHの順に時分割多重しても良い。
図7は、本発明の実施の形態2に係る無線送信装置を備える通信装置の主要な構成を示すブロック図である。なお、この通信装置は、実施の形態1に示した通信装置(図3参照)と同様の基本的構成を有しており、同一の構成要素には同一の符号を付し、その説明を省略する。
が異なれば原理的にPAPRも異なることとなるため、SDCHの変調方式とSCCHの変調方式とが異なる場合は、この原理的なPAPRの差を電力差として設定しても、全体のPAPRは増加せず、PAPRの低い方の変調方式を用いたチャネルのスループットを向上させることができるためである。
図10は、本発明の実施の形態3に係る無線送信装置を備える通信装置の主要な構成を示すブロック図である。なお、この通信装置も、実施の形態1に示した通信装置と同様の基本的構成を有しており、同一の構成要素には同一の符号を付し、その説明を省略する。
照し、まず、CQI情報に応じてSDCHのMCS1を決定する。次に、同様にCQIルックアップテーブル122を参照してCQI補正コマンドを取得する。このCQI補正コマンドは具体的には「−1」または「0(すなわち補正なし)」であり、情報選択部121bは、CQI情報にこのCQI補正コマンドを加算し、補正後の新たなCQI情報に応じてSCCHのMCS2を決定する。MCS2が決定されるのに伴い多重位置も決定されるので、MCS1およびMCS2に多重情報も含めて出力する。
をそれぞれ復号化し、出力する。
Claims (12)
- 通信相手から報告されるCQI(Channel Quality Indicator)に基づいて送信信号のMCS(Modulation and Coding Scheme)を決定する無線送信装置であって、
通信相手から報告されるCQIに基づいてデータチャネルのMCSを決定し、かつ、同一のCQIに基づいて制御チャネルのMCSも決定する決定手段と、
前記データチャネルおよび前記制御チャネルを含む送信信号を送信する送信手段と、
を具備する無線送信装置。 - 一つのCQIに対し、データチャネルのMCSおよび制御チャネルのMCSの双方が対応付けられて記憶されているCQIテーブルをさらに具備し、
前記決定手段は、
前記CQIテーブルを参照して、前記データチャネルのMCSおよび前記制御チャネルのMCSを決定する、
請求項1記載の無線送信装置。 - 前記CQIテーブルにおいて、一つのCQIに対応するデータチャネルのMCSおよび制御チャネルのMCSは、所要PAPR(Peak to Average Power Ratio)を満たすような関係にある、
請求項2記載の無線送信装置。 - 前記CQIテーブルに、前記データチャネルおよび前記制御チャネルの時間軸上における多重位置も記憶されている、
請求項3記載の無線送信装置。 - 前記CQIテーブルは、
無線受信装置がSCCHのMCSを決定する際に使用するCQIテーブルと同一である、
請求項3記載の無線送信装置。 - 報告されるCQIが高い場合、前記データチャネルおよび前記制御チャネルに対し送信電力制御を施し、報告されるCQIが低い場合、前記データチャネルおよび前記制御チャネルに対し送信電力制御を施さない送信電力制御手段、
をさらに具備する請求項3記載の無線送信装置。 - 前記CQIテーブルに基づいて決定された前記データチャネルおよび前記制御チャネルの符号化方式が異なる場合、PAPRが変化しない範囲内で前記データチャネルおよび前記制御チャネル間で所定の送信電力差を設定する設定手段、
をさらに具備する請求項5記載の無線送信装置。 - 前記通信相手からCQI補正コマンドを取得する取得手段と、
前記データチャネルまたは前記制御チャネルの一方について、前記CQIテーブルを参照する際に使用するCQIを、前記CQI補正コマンドに従って補正する補正手段と、
をさらに具備する請求項3記載の無線送信装置。 - 前記データチャネルとしてSDCH(Scheduled Data Channel)を用い、前記制御チャネルとしてSCCH(Scheduled Control Channel)を用いる、
請求項3記載の無線送信装置。 - 請求項1記載の無線送信装置を具備する移動局装置。
- 請求項1記載の無線送信装置を具備する基地局装置。
- 通信相手から報告されるCQIに基づいて送信信号のMCSを決定する無線送信方法であって、
通信相手から報告されるCQIに基づいてデータチャネルのMCSを決定するステップと、
同一のCQIに基づいて制御チャネルのMCSを決定するステップと、
前記データチャネルおよび前記制御チャネルを含む送信信号を送信するステップと、
を具備する無線送信方法。
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CN (2) | CN101278533B (ja) |
ES (4) | ES2611205T3 (ja) |
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JP5237287B2 (ja) * | 2006-10-02 | 2013-07-17 | エルジー エレクトロニクス インコーポレイティド | ダウンリンク制御信号の伝送方法 |
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