JPWO2009087743A1 - 無線送信装置及び無線送信方法 - Google Patents
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- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
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- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0028—Formatting
- H04L1/003—Adaptive formatting arrangements particular to signalling, e.g. variable amount of bits
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- H—ELECTRICITY
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- 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
- H04L1/0033—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter
- H04L1/0035—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter evaluation of received explicit signalling
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- H04L2001/0098—Unequal error protection
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- H—ELECTRICITY
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- H04L5/00—Arrangements affording multiple use of the transmission path
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- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
- H04W28/18—Negotiating wireless communication parameters
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- H—ELECTRICITY
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- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
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- H—ELECTRICITY
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- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
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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
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/50—Reducing energy consumption in communication networks in wire-line communication networks, e.g. low power modes or reduced link rate
Abstract
Description
R1-073344, Nokia,"Update to 64QAM CQI tables" , 3GPP TSG RAN WG1 Meeting #50 , Athens, Greece, August 20-24, 2007 3GPP TS36.212 V8.0.0
図6は、本発明の実施の形態1に係る無線通信端末装置の構成を示すブロック図である。以下、図6を参照して無線通信端末装置の構成について説明する。無線受信部102は、アンテナ101を介して受信した信号をベースバンド信号に変換し、CP除去部103に出力する。
本発明の実施の形態2に係る無線通信端末装置の構成は、実施の形態1の図6に示した構成と同様であるので、図6を援用し、重複する説明は省略する。
制御チャネル用CQI=CQI+Σオフセット[条件] …(1)
図13は、本発明の実施の形態3に係るCQIテーブルであり、式(1)に倍率(N)を乗算することにより、基本テーブルの設定範囲を拡大あるいは縮小することができる。制御チャネル用CQIは、式(2)を用いて算出される。
制御チャネル用CQI=floor(N×(CQI+Σオフセット[条件]))…(2)
ここで、Nは小数である。
図14は、本発明の実施の形態4に係るCQIテーブルであり、実施の形態3に示した式(2)を用いて算出される。ただし、Nは小数であり、N=N_A(CQI<CQI_TH)、N=N_B(CQI>CQI_TH)とする。図14は、具体的には、CQI_TH=3、N_A=0.7、N_B=1.3の場合を示している。このように、CQIの大きさによって倍率(N)を変えることにより、より精度よくMCSを決定することができる。
R1-073344, Nokia,"Update to 64QAM CQI tables" , 3GPP TSG RAN WG1 Meeting #50 , Athens, Greece, August 20-24, 2007 3GPP TS36.212 V8.0.0
されるため、制御チャネル用リソースが無駄となる。しかしながら、この無駄なリソースは、データチャネル用リソースとして使用することができず、データチャネルのスループットが低下してしまう。
図6は、本発明の実施の形態1に係る無線通信端末装置の構成を示すブロック図である。以下、図6を参照して無線通信端末装置の構成について説明する。無線受信部102は、アンテナ101を介して受信した信号をベースバンド信号に変換し、CP除去部103に出力する。
波数領域信号を得る。そして、送信サブキャリアに周波数領域信号をマッピングした後、IFFT(Inverse Fast Fourier Transform)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113に出力される。
本発明の実施の形態2に係る無線通信端末装置の構成は、実施の形態1の図6に示した
構成と同様であるので、図6を援用し、重複する説明は省略する。
制御チャネル用CQI=CQI+Σオフセット[条件] …(1)
図13は、本発明の実施の形態3に係るCQIテーブルであり、式(1)に倍率(N)を乗算することにより、基本テーブルの設定範囲を拡大あるいは縮小することができる。制御チャネル用CQIは、式(2)を用いて算出される。
制御チャネル用CQI=floor(N×(CQI+Σオフセット[条件]))…(2)
ここで、Nは小数である。
図14は、本発明の実施の形態4に係るCQIテーブルであり、実施の形態3に示した式(2)を用いて算出される。ただし、Nは小数であり、N=N_A(CQI<CQI_TH)、N=N_B(CQI>CQI_TH)とする。図14は、具体的には、CQI_TH=3、N_A=0.7、N_B=1.3の場合を示している。このように、CQIの大きさによって倍率(N)を変えることにより、より精度よくMCSを決定することができる。
Claims (11)
- 無線通信端末装置のパラメータに応じて、CQIとMCSとの対応関係を切り替え、切り替え後の対応関係に基づいて制御チャネルのMCSを決定するMCS選択手段と、
決定されたMCSによって制御データを符号化及び変調する符号化変調手段と、
を具備する無線送信装置。 - 前記MCS選択手段は、複数のCQIテーブルを備え、前記パラメータに応じて、前記複数のCQIテーブルを切り替え、切り替えたCQIテーブルを用いて制御チャネルのMCSを決定する請求項1記載の無線送信装置。
- 前記MCS選択手段は、前記パラメータとオフセット値とが対応付けられたオフセットテーブルを備え、該当する前記パラメータに対応するオフセット値を全て加算したCQIに基づいて、制御チャネルのMCSを決定する請求項1に記載の無線送信装置。
- 前記MCS選択手段は、前記パラメータに対応するオフセット値を全て加算したCQIに倍率を乗算して求めた新たなCQIに基づいて、制御チャネルのMCSを決定する請求項2に記載の無線送信装置。
- 前記MCS選択手段は、前記パラメータが送信帯域幅であり、送信帯域幅が狭いほど、より低いMCSを選択する請求項1に記載の無線送信装置。
- 前記MCS選択手段は、前記パラメータがデータチャネルのスケジューリング方法であり、パーシステントスケジューリングの場合にはより高いMCSを選択する請求項1に記載の無線送信装置。
- 前記MCS選択手段は、前記パラメータがデータチャネルの送信方法であり、フレーム内周波数ホッピングが適用されず、かつ、送信帯域幅が狭い場合、より低いMCSを選択する請求項1に記載の無線送信装置。
- 前記MCS選択手段は、前記パラメータがデータチャネルの再送回数であり、再送回数が多いほど、より低いMCSを選択する請求項1に記載の無線送信装置。
- 前記MCS選択手段は、前記パラメータに対応するオフセット値を全て加算したCQIに乗算する倍率をCQIの大きさに応じて制御する請求項4に記載の無線送信装置。
- 前記MCS選択手段は、データチャネルのMCSを決定する場合は前記パラメータに応じてCQIとMCSの対応関係を切り替えない請求項1に記載の無線送信装置。
- 無線通信端末装置のパラメータに応じて、CQIとMCSの対応関係を切り替える切り替えステップと、
切り替えた後の対応関係に基づいて、制御チャネルのMCSを決定するMCS選択ステップと、
決定されたMCSによって制御データを符号化及び変調する符号化変調ステップと、
を具備する無線送信方法。
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