JP4718269B2 - 無線ネットワークにおけるサブチャンネルの割り当て方法 - Google Patents
無線ネットワークにおけるサブチャンネルの割り当て方法 Download PDFInfo
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- JP4718269B2 JP4718269B2 JP2005222300A JP2005222300A JP4718269B2 JP 4718269 B2 JP4718269 B2 JP 4718269B2 JP 2005222300 A JP2005222300 A JP 2005222300A JP 2005222300 A JP2005222300 A JP 2005222300A JP 4718269 B2 JP4718269 B2 JP 4718269B2
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- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0417—Feedback systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0452—Multi-user MIMO systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
- H04B7/0621—Feedback content
- H04B7/0626—Channel coefficients, e.g. channel state information [CSI]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- 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
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- 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
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- 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
- H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
- H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/02—Arrangements for detecting or preventing errors in the information received by diversity reception
- H04L1/06—Arrangements for detecting or preventing errors in the information received by diversity reception using space diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0008—Modulated-carrier systems arrangements for allowing a transmitter or receiver to use more than one type of modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0012—Modulated-carrier systems arrangements for identifying the type of modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0014—Three-dimensional division
- H04L5/0023—Time-frequency-space
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04L5/0037—Inter-user or inter-terminal allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
- H04L5/0046—Determination of how many bits are transmitted on different sub-channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04L5/0058—Allocation criteria
- H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04L5/0058—Allocation criteria
- H04L5/0075—Allocation using proportional fairness
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0091—Signaling for the administration of the divided path
- H04L5/0094—Indication of how sub-channels of the path are allocated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/51—Allocation or scheduling criteria for wireless resources based on terminal or device properties
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0204—Channel estimation of multiple channels
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/0224—Channel estimation using sounding signals
- H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- 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
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
- H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
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- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Quality & Reliability (AREA)
- Mobile Radio Communication Systems (AREA)
- Radio Transmission System (AREA)
Description
(a)前記基地局はそれぞれの所定のタイムスロットlにおいて、システムに加入している各ユーザーの最小許容データ転送率φiに基づいて、各ユーザー間の相対的な重みを計算する手順と、
(b)現在第cのサブチャンネルのユーザーiに対してサポートするデータ転送率SDRc (i)と、所定の過去の長さがtcであるウィンドウ内の各ユーザーの平均スループットTiに基づいて、システム全体のすべてのユーザーに対してφiSDRc (i)/Tiを計算する手順と、
(c)最大のφiSDRc (i)/Ti値を有するユーザーiを選択して、サブチャンネルcをユーザーiに割り当てる手順と、
(d)すべてのチャンネルに対して前記(a)〜(c)の手順を行う手順と、
を含む。
前記手順(b)において、Γの中の各要素に対してφiSDRc (i)/Tiを計算し、
前記手順(c)において、最大のφiSDRc (i)/Tiを選択し、Γの中の対応する列番号のサブチャンネルをΓの中の対応する行番号のユーザーに割り当てから、Γの中の対応する列を削除し、
前記手順(d)において、Γの中のすべての列が削除されるまで前記手順(c)に戻る。
第二のユーザー:チャンネル8
第三のユーザー:チャンネル4、チャンネル5、チャンネル6
第四のユーザー:チャンネル1、チャンネル2、チャンネル3、チャンネル7
Tiを更新する(ここではtc=200にする)
その後、ユーザーは次のスケジューリング単位のパイロット信号に基づいて各チャンネルのSNRをモニタリングし、次のタイムスロットのスケジューリングが完了するまで式 (15)の作業が続く。
Claims (11)
- 無線ネットワークには複数のユーザーが加入しており、基地局はNT個の送信アンテナを有し、あるユーザーiがNR個の受信アンテナを有するとして、NT個の送信アンテナとK個のサブキャリア群によって決められるネットワーク容量をK個のサブチャンネル伝送に分割し、NT個の送信アンテナによって決められるネットワークバンド幅をK個のサブチャンネルに分割する無線ネットワークにおけるサブチャンネルの割り当て方法において、
前記基地局は、それぞれのサブチャンネルが各ユーザーに対してサポートするデータ転送率と所定時間内における各ユーザーの平均スループットとの比例値、および各ユーザーの要求するサービス品質に基づいて、順次に複数ユーザーに対してチャンネルの割り当てを行うものであり、
前記各ユーザーの希望するサービス品質は、ユーザーの最小許容データ転送率であり、
前記サブチャンネルの割り当て方法は、
(a)前記基地局はそれぞれの所定のタイムスロットlにおいて、システムに加入している各ユーザーの最小許容データ転送率φiに基づいて、各ユーザー間の相対的な重みを計算する手順と、
(b)現在第cのサブチャンネルのユーザーiに対してサポートするデータ転送率SDRc (i) と、所定の過去の長さがtcであるウィンドウ内の各ユーザーの平均スループットTiに基づいて、システム全体のすべてのユーザーに対してφiSDRc (i) /Tiを計算する手順と、
(c)最大のφiSDRc (i) /Ti値を有するユーザーiを選択して、サブチャンネルcをユーザーiに割り当てる手順と、
(d)すべてのチャンネルに対して前記(a)〜(c)の手順を行う手順と、
を含むことを特徴とする無線ネットワークにおけるサブチャンネルの割り当て方法。 - 前記ユーザーの重みφiは前記基地局により計算、保存され、スケジューリングの重み係数とすることを特徴とする請求項1に記載のサブチャンネルの割り当て方法。
- 前記手順(b)において、それぞれのサブチャンネルに対して、前記基地局は適応変調符号化(AMC)のパターン表中のパターンIDと前記SDRc (i) との対応関係を利用し、各ユーザーからフィードバックされたパターンIDに基づいて、前記SDRc (i) を確定することを特徴とする請求項1に記載のサブチャンネルの割り当て方法。
- 適応変調符号化(AMC)パターン表を前記基地局とユーザーの双方が保持し、
前記手順(b)において、前記基地局は、前記適応変調符号化(AMC)パターン表と各ユーザーからフィードバックされたパターンIDとに基づいて、前記SDRc (i) をそれぞれのサブチャンネルに対して、確定することを特徴とする請求項1に記載のサブチャンネルの割り当て方法。 - 各所定のタイムスロットlの後、すべてのサブチャンネルが割り当てられるまで前記平均スループットTiを更新することを特徴とする請求項1に記載のサブチャンネルの割り当て方法。
- ユーザーは受信された信号対雑音比SNRに基づき、適応変調符号化(AMC)のパターンを決定し、選択されたAMCのパターンIDを前記基地局にフィードバックすることを特徴とする請求項2に記載のサブチャンネルの割り当て方法。
- ユーザーは適応変調符号化(AMC)のパターンIDを含むチャンネル状態情報を前記基地局にフィードバックすることを特徴とする請求項2に記載のサブチャンネルの割り当て方法。
- 前記無線ネットワークは無線セルラネットワークであることを特徴とする請求項1に記載のサブチャンネルの割り当て方法。
- 前記無線ネットワークは直交周波数分割多重化(OFDM)とマルチ入力マルチ出力(MIMO)の技術を採用することを特徴とする請求項1に記載のサブチャンネルの割り当て方法。
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CN200410068586.1 | 2004-08-27 | ||
CN2004100685861A CN1741412B (zh) | 2004-08-27 | 2004-08-27 | 无线网络中子信道分配的方法 |
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JP4718269B2 true JP4718269B2 (ja) | 2011-07-06 |
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