JP5797310B2 - 無線通信装置及びコンスタレーション制御方法 - 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 (12)
- 互いに異なる循環シフト量により互いに分離可能な複数の第1系列のいずれかを用いて送信信号を1次拡散する第1拡散部と、
前記複数の第1系列のうちの一部の第1系列を用いて拡散される前記送信信号からなる第1信号グループの第1コンスタレーションに対し、前記複数の第1系列のうちの前記一部の第1系列以外の第1系列を用いて拡散される前記送信信号からなる第2信号グループの第2コンスタレーションを反転させる反転部と、
を具備する無線通信装置。 - 1次拡散後の前記送信信号を互いに直交する複数の第2系列のいずれかを用いて2次拡散する第2拡散部、をさらに具備する、
請求項1に記載の無線通信装置。 - 前記第1信号グループに属する前記送信信号が割り当てられるチャネルと前記第2信号グループに属する前記送信信号が割り当てられるチャネルとは循環シフト軸上において交互に配置される、
請求項1又は2に記載の無線通信装置。 - 前記反転部は、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前記第1コンスタレーションに対し前記第2コンスタレーションを反転させる、
請求項1から3の何れかに記載の無線通信装置。 - 前記反転部は、さらに、互いに隣接する2つのセル間において、同一循環シフト量の前記第1系列で1次拡散される2つの前記送信信号の一方のコンスタレーションに対し、他方のコンスタレーションを反転させる、
請求項1から4の何れかに記載の無線通信装置。 - 前記第1信号グループと前記第2信号グループとは受信機での受信電力が互いに異なり、
前記反転部は、前記受信機への送信のために、前記第1信号グループの第1コンスタレーションに対し、前記第2信号グループの第2コンスタレーションを反転させる、
請求項1から5の何れかに記載の無線通信装置。 - 前記送信信号を前記受信機へ送信する送信部、を更に具備する、
請求項6に記載の無線通信装置。 - 前記送信信号は、応答信号である、
請求項1から7の何れかに記載の無線通信装置。 - 前記反転部は、ACKからの符号間干渉によるNACK誤り率の増加を防ぐために、前記第1信号グループの第1コンスタレーションに対し、前記第2信号グループの第2コンスタレーションを反転させる、
請求項8に記載の無線通信装置。 - 前記複数の第1系列は、ZAC(Zero Auto Correlation)系列である、
請求項1から9の何れかに記載の無線通信装置。 - 前記無線通信装置は、移動局である、
請求項1から10の何れかに記載の無線通信装置。 - 互いに異なる循環シフト量により互いに分離可能な複数の第1系列のいずれかを用いて送信信号を1次拡散し、
前記複数の第1系列のうちの一部の第1系列を用いて拡散される前記送信信号からなる第1信号グループの第1コンスタレーションに対し、前記複数の第1系列のうちの前記一部の第1系列以外の第1系列を用いて拡散される前記送信信号からなる第2信号グループの第2コンスタレーションを反転する、
コンスタレーション制御方法。
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