JP2010519879A - 無線通信システムにおいて制御信号を伝送する方法 - Google Patents
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Abstract
【解決手段】無線通信システムにおいて制御信号伝送方法は、第1の制御信号と第2の制御信号を時間領域で複数のOFDM(orthogonal frequency division multiplexing)シンボルで構成されたスロット内で多重化し、前記複数のOFDMシンボルは、前記第1の制御信号の伝送のための複数のデータOFDMシンボルと基準信号の伝送のための複数の基準信号OFDMシンボルとに分けられ、前記第1の制御信号は、周波数領域で基本シーケンスにより拡散された後、前記複数のデータOFDMシンボルにマッピングされ、前記基準信号は、前記複数の基準信号OFDMシンボルにマッピングされ、前記第2の制御信号は、前記複数の基準信号OFDMシンボルのうち少なくとも一つにマッピングされる段階、及び前記スロットを介して前記第1の制御信号と前記第2の制御信号を伝送する段階を含む。
【選択図】図2
Description
高容量(large-sized)制御信号を伝送するための制御チャネル(例えば、CQIチャネル)を介して低容量(small-sized)制御信号(例えば、ACK/NACK信号、スケジューリング要請信号等)を多重化して送る方式である。低容量制御信号は、高容量制御信号に比べてその大きさが小さい、例えば、そのビット数が小さい制御信号をいい、必ず絶対的な大きさを限定することではない。
アップリンク制御信号の伝送のために複数の資源ブロックの割当を受ける場合、低いPAPR/CMを有する単一搬送波特性(single carrier property)を維持するためには周波数領域拡散符号を割り当てられた資源ブロックの大きさに合わせなければならない。図5の制御チャネル構造で支援可能な端末の数及び単位時間当り伝送容量は、割当を受けた資源ブロックの数に関係なく限定される。例えば、2資源ブロックで構成された制御チャネルが支援する端末容量と伝送容量は、各々6と5OFDMシンボル/スロットであって、1資源ブロックで構成された制御チャネルが支援する端末容量及び伝送容量と同一である。従って、既存制御チャネル構造によると、周波数資源を追加的に割り当てても、伝送容量は増加できないため、周波数効率を低下させる。従って、複数の資源ブロックが割り当てられる場合、優秀なPAPR/CM特性を維持しながら、追加される周波数資源割当に従って伝送容量を増加させることができる制御チャネル構造が必要である。
20 基地局
100 伝送器
110 伝送プロセッサ
120 DFT部
130 IFFT部
190 伝送アンテナ
Claims (13)
- 無線通信システムにおいて制御信号伝送方法において、
第1の制御信号と第2の制御信号を時間領域で複数のOFDM(orthogonal frequency division multiplexing)シンボルで構成されたスロット内で多重化し、前記複数のOFDMシンボルは、前記第1の制御信号の伝送のための複数のデータOFDMシンボルと基準信号の伝送のための複数の基準信号OFDMシンボルとに分けられ、前記第1の制御信号は、周波数領域で基本シーケンスにより拡散された後、前記複数のデータOFDMシンボルにマッピングされ、前記基準信号は、前記複数の基準信号OFDMシンボルにマッピングされ、前記第2の制御信号は、前記複数の基準信号OFDMシンボルのうち少なくとも一つにマッピングされる段階;及び、
前記スロットを介して前記第1の制御信号と前記第2の制御信号を伝送する段階;
を含む制御信号伝送方法。 - サブフレームは、二つのスロットで構成され、前記サブフレーム内で前記二つのスロットの各々は、他の副搬送波を使用することを特徴とする請求項1に記載の制御信号伝送方法。
- 前記第1の制御信号の情報ビットの数は、前記第2の制御信号より多いことを特徴とする請求項1に記載の制御信号伝送方法。
- 前記第1の制御信号は、ダウンリンクチャネル状態を示すCQI(channel quality indicator)で、前記第2の制御信号は、HARQ(hybrid automatic repeat request)のためのACK/NACK信号であることを特徴とする請求項1に記載の制御信号伝送方法。
- 前記データOFDMシンボルの数は、前記基準信号OFDMシンボルより多いことを特徴とする請求項1に記載の制御信号伝送方法。
- 前記スロットは、5個のデータOFDMシンボルと2個の基準信号OFDMシンボルを含み、前記2個の基準信号OFDMシンボルは隣接しないことを特徴とする請求項5に記載の制御信号伝送方法。
- 前記第2の制御信号は、スロット内の最後の基準信号OFDMシンボルにマッピングされることを特徴とする請求項1に記載の制御信号伝送方法。
- 前記第2の制御信号は、一つの変調シンボルであることを特徴とする請求項1に記載の制御信号伝送方法。
- 前記第1の制御信号は、QPSK(quadrature phase shift keying)変調を使用して、前記第2の制御信号は、BPSK(binary phase shift keying)またはQPSK変調を使用することを特徴とする請求項1に記載の制御信号伝送方法。
- 無線通信システムにおいて制御信号伝送方法において、
複数のOFDMシンボルを含むスロットを介してアップリンク制御チャネル上に第1の制御信号と第2の制御信号を伝送する段階を含み、
前記第2の制御信号は、前記第1の制御信号のための基準信号と多重化され、前記第1の制御信号と前記基準信号は、前記アップリンク制御チャネル上で相異のOFDMシンボルを介して伝送され、前記第2の制御信号は、前記基準信号の伝送に使われるOFDMシンボルのうち一つを介して前記基準信号と共に伝送され、前記第1の制御信号は、QPSK変調を使用し、前記第2の制御信号は、BPSK(binary phase shift keying)またはQPSK変調を使用することを特徴とする制御信号伝送方法。 - 無線通信システムにおいて制御信号伝送方法において、
第1の制御信号と第2の制御信号のためのアップリンク制御チャネルを設定し、前記第1の制御信号と基準信号は、前記アップリンク制御チャネル上で相異のOFDMシンボル上で伝送され、前記第2の制御信号は、前記基準信号と多重化される段階;及び、
前記第1の制御信号と前記第2の制御信号を前記アップリンク制御チャネル上に伝送する段階;
を含むことを特徴とする制御信号伝送方法。 - 前記第1の制御信号は、QPSK変調を使用して、前記第2の制御信号は、BPSKまたはQPSK変調を使用することを特徴とする請求項11に記載の制御信号伝送方法。
- 前記第2の制御信号は、前記基準信号の伝送に使われるOFDMシンボルのうち一つを介して前記基準信号と共に伝送されることを特徴とする請求項11に記載の制御信号伝送方法。
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