JP4555866B2 - 制御チャネル情報伝送方法,及びこれを用いた基地局及び端末 - Google Patents
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Description
Modulation and Coding)方式の場合,制御チャネルはデータチャネルの変調方式及び符号化率などの情報を伝送する。HARQの場合,制御チャネルはデータチャネルで伝送されるパケットのパケット番号や再送回数などの情報を伝送する。スケジューリングの場合,制御チャネルはユーザID等の情報を伝送する。
Generation Partnership Protocol)で標準化されているHSDPA(High Speed Downlink Packet
Access)では,非特許文献1に記載されているように,HS−SCCH(Shared Control Channel for HS-DSCH)と呼ばれる共通制御チャネルを用いて,表1に示すような制御情報の伝送が行われる。
さらに,上記HSDPAでは,無線環境と伝送速度の関係を示す図1において,AMC方式の場合,無線環境Iの変化において伝播状態が良い場合(閾値レベルTHを超える時)は,変調方式を16値QAM(Quadrature Amplitude Modulation) として符号化率を大きくし,高速データ伝送を行う。
3GGP TS 25.212 V5.9.0(2004-06)
Modulation and Coding)方式を適用したパケット型データ伝送において,制御チャネル情報であるHS−SCCHに対する誤り訂正符号化における符号化率を可変とすることにより上記の問題を解決することに着目した。
Quality Indicator)などの情報に基づいて,制御チャネルフォーマットを選択する。
Claims (9)
- 適応符号化変調を行うための制御チャネル情報の伝送方法であって、
送信側で、
前記制御チャネル情報に対し、誤り訂正符号化を行い、
前記誤り訂正符号化された制御チャネル情報を所定の変調方式で変調して伝送し、
さらに、多入力多出力の適用のときに前記変調の前の前記制御チャネルの符号化率を前記多入力多出力を適用しないときの符号化率より大きくして、伝送符号ビット数を前記多入力多出力の適用の有無によらず所定数とする、
ことを特徴とする制御チャネル情報の伝送方法。 - 請求項1において、
受信側で、
前記伝送された制御チャネル情報を受信し、前記所定の変調方式に対応して復調し、前記多入力多出力の適用の有無を反映した符号化率のそれぞれに対応する誤り訂正復号を行う、
ことを特徴とする制御チャネル情報の伝送方法。 - 請求項1において、
受信側で、
前記多入力多出力の適用の有無に応じて異にされる符号化率のそれぞれに対応する誤り訂正復号装置により、共通に受信される信号に対し誤り訂正復号を行い、
さらに前記誤り訂正復号された信号の内の確からしさを判断し、
前記確からしさの判断結果に基づき、有効とされた誤り訂正復号された信号を出力する、
ことを特徴とする制御チャネル情報の伝送方法。 - 適応符号化変調を行うための制御チャネル情報を伝送する伝送システムであって、
基地局側に、
前記制御チャネル情報に対し、誤り訂正符号化を行う誤り訂正符号化装置と、
前記誤り訂正符号化装置の符号化出力を所定の変調方式により変調を行う変調装置を有し、
前記誤り訂正符号化装置における符号化率を、多入力多出力の適用のときに前記変調の前の前記制御チャネルの符号化率を前記多入力多出力を適用しないときの符号化率より大きくして、伝送符号ビット数を前記多入力多出力の適用の有無によらず所定数とする、
ように構成されていることを特徴とする伝送システム。 - 請求項4において、
受信側に、
前記伝送された制御チャネル情報を受信し、前記所定の変調方式に対応して復調し、前記多入力多出力の適用の有無を反映した符号化率のそれぞれに対応する符号化率で、誤り訂正復号を行う装置を有する、
ことを特徴とする伝送システム。 - 請求項4において、
受信側に、
前記多入力多出力の適用の有無に応じて異にされる符号化率のそれぞれに対応する符号化率で、共通に受信される信号に対し誤り訂正復号を行う複数の誤り訂正復号装置と、
前記複数の誤り訂正復号装置により、前記誤り訂正復号された信号の内の確からしさを判断し、前記確からしさの判断結果に基づき、有効とされた誤り訂正復号された信号を出力する装置を、
有することを特徴とする制御チャネル情報の伝送システム。 - 適応符号化変調を行うための制御チャネル情報を伝送する伝送システムにおける基地局であって、
制御チャネル情報に対し、誤り訂正符号化を行う誤り訂正符号化装置と、
前記誤り訂正符号化装置の符号化出力を所定の変調方式により変調を行う変調装置を有し、
前記誤り訂正符号化装置における符号化率を、多入力多出力の適用のときに前記制御チャネルの符号化率を前記多入力多出力を適用しないときの符号化率より大きくして、伝送符号化ビット数を前記多入力多出力の適用の有無によらず所定数とする、
ように構成されていることを特徴とする基地局。 - 請求項7の基地局に対応する制御チャネル情報の受信を行うユーザ端末であって、
前記伝送された制御チャネル情報を受信し、前記所定の変調方式に対応して復調し、前記多入力多出力の適用の有無を反映した符号化率のそれぞれに対応する符号化率で、誤り訂正復号を行う装置を、
有することを特徴とするユーザ端末。 - 請求項7の基地局に対応する制御チャネル情報の受信を行うユーザ端末であって、
前記多入力多出力の適用の有無に応じて異にされる符号化率のそれぞれに対応する符号化率で、共通に受信される信号に対し誤り訂正復号を行う複数の誤り訂正復号装置と、
前記複数の誤り訂正復号装置により、前記誤り訂正復号された信号の内の確からしさを判断し、前記確からしさの判断結果に基づき、有効とされた誤り訂正復号された信号を出力する装置を、
有することを特徴とするユーザ端末。
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