JP5377619B2 - 移動局装置および送信方法 - Google Patents
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Description
つまり後者の場合には、移動局は基地局より上位のレイヤーでの再送制御等を待たなければ所望の下り回線データを得ることができず、その結果、下り回線データ伝送に大きな遅延が発生してしまう。応答信号の受信誤りによって生じるこのような結果を考慮して、3GPP-LTEではACKの目標誤り率(Target Error Rate)を1%程度にするよう規定されているのに対し、NACKの目標誤り率を0.01%程度にするよう規定されている。つまり、NACKの誤り率を十分に小さくすることが望まれている。
本実施の形態に係る基地局100の構成を図5に示し、本実施の形態に係る移動局200の構成を図6に示す。
本実施の形態は、1サブフレームを構成する複数のスロットのうち特定のスロットにおいてのみ実施の形態1を行うものである。
本実施の形態では、例えばセル#1では図7に示すようにしてコンスタレーションを反転させる一方で、セル#1に隣接するセル#2では図11に示すようにしてコンスタレーションを反転させる。よって例えばPUCCH#1に着目すると、セル#1のPUCCH#1にはコンスタレーション#2(図8,図9)が用いられる一方で、セル#2のPUCCH#1にはコンスタレーション#1(図3,図4)が用いられる。同様に、PUCCH#2に着目すると、セル#1のPUCCH#2にはコンスタレーション#1(図3,図4)が用いられる一方で、セル#2のPUCCH#2にはコンスタレーション#2(図8,図9)が用いられる。
本実施の形態では、応答信号を変調する際にコンスタレーションを反転させる。
実施の形態1〜4では参照信号のコンスタレーションを変化させずに応答信号のコンスタレーションを反転させた。これに対し、本実施の形態では、図13に示すように、応答信号のコンスタレーションを変化させずに参照信号のコンスタレーションを反転させる。
基地局において複数の移動局からの応答信号間に受信電力の大きな差がある場合、受信電力の大きな応答信号が受信電力の小さな応答信号に干渉を与えることがある。例えば、図15に示すBW#0を用いて2次拡散される応答信号のうち、PUCCH#0を用いて送信される応答信号の受信電力およびPUCCH#3を用いて送信される応答信号の受信電力が大きく、その他のPUCCHを用いて送信される応答信号の受信電力が小さい場合には、PUCCH#0を用いて送信される応答信号およびPUCCH#3を用いて送信される応答信号が、その他のPUCCHを用いて送信される応答信号に最も大きな干渉を与える。
Claims (8)
- ACK、NACK信号を送信する移動局装置であって、
前記ACK、NACK信号に、コンスタレーションを回転させるための第1の値、若しくはコンスタレーションを回転させないための第2の値の何れかを乗算する乗算部と、
前記第1の値、若しくは前記第2の値が乗算された前記ACK、NACK信号を送信する送信部とを有し、
前記乗算部は、
基地局装置から制御情報を受信する際に用いられる1つ若しくは複数のCCEのうち最初のCCEの番号に関連するPUCCH番号が第1のPUCCH番号グループに属する場合に、1つのサブフレームを構成する第1スロット及び第2スロットについて、前記第1スロットの送信の際および前記第2スロットの送信の際に同じ値を乗算し、
前記PUCCH番号が第2のPUCCH番号グループに属する場合に、前記第1スロットの送信の際および前記第2スロットの送信の際に相互に異なる値を乗算する、
移動局装置。 - 前記1つのサブフレームに使用可能な全てのPUCCH番号の其々は、前記第1のPUCCH番号グループ若しくは前記第2のPUCCH番号グループの何れかに属する、
請求項1記載の移動局装置。 - 前記第1スロットと前記第2スロットとで構成されるサブフレームに使用可能な複数のPUCCH番号に、前記第1のPUCCH番号グループに属するPUCCH番号と、前記第2のPUCCH番号グループに属するPUCCH番号との双方を含む、
請求項1記載の移動局装置。 - 前記乗算部は、前記PUCCH番号に対応する系列インデックスを有する直交系列と、前記PUCCH番号に対応するサイクリックシフト量にて定義される系列とを前記ACK、NACK信号に乗算する、
請求項1記載の移動局装置。 - ACK、NACK信号を送信する送信方法であって、
前記ACK、NACK信号に、コンスタレーションを回転させるための第1の値、若しくはコンスタレーションを回転させないための第2の値の何れかを乗算し、
前記第1の値、若しくは前記第2の値が乗算された前記ACK、NACK信号を送信し、
前記乗算では、
基地局装置から制御情報を受信する際に用いられる1つ若しくは複数のCCEのうち最初のCCEの番号に関連するPUCCH番号が第1のPUCCH番号グループに属する場合に、1つのサブフレームを構成する第1スロット及び第2スロットについて、前記第1スロットの送信の際および前記第2スロットの送信の際に同じ値を乗算し、
前記PUCCH番号が第2のPUCCH番号グループに属する場合に、前記第1スロットの送信の際および前記第2スロットの送信の際に相互に異なる値を乗算する、
送信方法。 - 前記1つのサブフレームに使用可能な全てのPUCCH番号の其々は、前記第1のPUCCH番号グループ若しくは前記第2のPUCCH番号グループの何れかに属する、
請求項5記載の送信方法。 - 前記第1スロットと前記第2スロットとで構成されるサブフレームに使用可能な複数のPUCCH番号に、前記第1のPUCCH番号グループに属するPUCCH番号と、前記第2のPUCCH番号グループに属するPUCCH番号との双方を含む、
請求項5記載の送信方法。 - 前記ACK、NACK信号に、前記PUCCH番号に対応する系列インデックスを有する直交系列と、前記PUCCH番号に対応するサイクリックシフト量にて定義される系列とを乗算する、
請求項5記載の送信方法。
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JP2013201771A (ja) * | 2007-10-29 | 2013-10-03 | Panasonic Corp | 基地局装置、送信装置及び受信方法 |
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