JP6554522B2 - Mimoシステムにおけるデータを送受信する方法及び装置 - Google Patents
Mimoシステムにおけるデータを送受信する方法及び装置 Download PDFInfo
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
- H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
- H04B7/2643—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile using time-division multiple access [TDMA]
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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
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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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
- H04L1/0043—Realisations of complexity reduction techniques, e.g. use of look-up tables
- H04L1/0044—Realisations of complexity reduction techniques, e.g. use of look-up tables specially adapted for power saving
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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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0052—Realisations of complexity reduction techniques, e.g. pipelining or use of look-up tables
- H04L1/0053—Realisations of complexity reduction techniques, e.g. pipelining or use of look-up tables specially adapted for power saving
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0072—Error control for data other than payload data, e.g. control data
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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
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- H04L1/0075—Transmission of coding parameters to receiver
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- H—ELECTRICITY
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
- H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control
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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
- H04L1/08—Arrangements for detecting or preventing errors in the information received by repeating transmission, e.g. Verdan system
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
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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
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/30—Definitions, standards or architectural aspects of layered protocol stacks
- H04L69/32—Architecture of open systems interconnection [OSI] 7-layer type protocol stacks, e.g. the interfaces between the data link level and the physical level
- H04L69/322—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions
- H04L69/323—Intralayer communication protocols among peer entities or protocol data unit [PDU] definitions in the physical layer [OSI layer 1]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13215—Code checking, CRC
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/10—Small scale networks; Flat hierarchical networks
- H04W84/12—WLAN [Wireless Local Area Networks]
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Description
従って、MAC階層では、伝達を受けたフレームの最後のデリミタまでパーシング(parsing)することによってフレームの終端を把握することができ、それによって、MACフレームを正確に復元することができる。このような方法では、802.11nのA−MPDUに適用されたナルデリミタ(null delimiter)を用いてフレームの長さを拡張するようになるため、MACフレームではMPDUでないA−MPDUのみが必ず使われなければならない。
その結果、図3のように同じ送信持続期間を有するフレームが生成されるため、送信端では、均一した電力を用いて送信持続期間中フレームを送信することができる。受信端では、フレーム長さが最も長い空間ストリームから安全にデータを検出することができ、長さが短い空間ストリームを受信する受信端末は、長さ情報を介して不要なデコーディングを実行しないようになる。この時、送信端で挿入されたPHYパッドは、受信端でのフレーム終端検出に影響を及ぼさない。
図7で、VHT−SIG Bフィールドを介してユーザ別フレームの長さを示すことができるため、テールフィールドは、PSDUの直後に存在することができる。VHT−SIG Bフィールドは、BPSK1/2に変調されるため信頼度が高く、これによって、長さ情報のエラー確率は低くなる。
1)Service field=Scrambler Seed(7bit)+Reserved(9bit)+User Length(16bit)
2)Service field=Scrambler Seed(7bit)+User Length(16bit)+CRC(8bit)
1)MCS、FEC、PSDU長さ、スクランブラシードフィールドにCRCを適用
2)サービスフィールドを除いたMCS、FEC、PSDU長さフィールドにCRCを適用
1)L_ampdu_x:user xのA−MPDU長さ(バイト単位)
2)L_psdu_x:user xのA−MPDU+図6によるMACパディングが含まれているPSDUの長さ(バイト単位)
3)Ndpbs_x:シンボル当たりデータビットの数、user xのMCSによる値(ビット単位)
4)Nsym:シンボル個数
5)L_padding_x:図6のMACパディング方式によるMACパッドの長さ(バイト単位)(Qwordパッド、ナルデリミタ(Null delimiter)、ファイナルMACパッド(Final MAC pad))
6)Nes:BCCエンコーダの個数
7)n個のユーザフレーム
1)Nsym_x=Ceiling((16+8×L_ampdu_x+6*Nes)/Ndpbs_x)
2)Nsym=max(Nsym_1,...,Nsym_n)
3)L_padding_x=round((Nsym×Ndpbs_x−16−6*Nes)/8)−L_ampdu_x
If(Ceiling(L_ampdu_x/4)*4<=(L_ampdu_x+L_padding_x)
Qwordパッドを挿入する
Else
L_padding_xバイトのファイナルMACパッドを挿入してPSDU生成完了
Npad_x;user xのPHYパッド長さ(ビット単位)
Nsym=L−SIG送信持続期間情報を介して受信端に伝達される情報
Ndata_x=Nsym×Ndbps_x
Npad_x=(Ndata_x−(16+6*Nes))%8;PHY Pad(0〜7)
L_qwordinB=Ceiling(L_ampdu_x/4)
If(L_psdu_x>=L_qwordinB*4)
First tail position=N_pos_first_tail=16+32×L_qwordinB
Else
Do nothing
Second tail position=N_pos_second_tail=Ndata_x−6*Nes
If(L_psdu_x>=L_qwordinB*4)
Rx vector length=L_qwordinB*4(バイト単位)
Tail position=16+32xL_qwordinB(ビット単位)
Else
Rx vector length=round((NsymxNdpbs_x−16−6*Nes)/8)(バイト単位)
Tail position=Ndata_x−6
Rx vector length=round((Nsym×Ndpbs_x−16−6*Nes)/8)(バイト単位)
Tail position=Ndata_x−6
1)Nsym_x=Ceiling((16+8×L_ampdu_x+6*Nes)/Ndpbs_x)
2)Nsym=max(Nsym_1,...,Nsym_n)
3)L_padding_x=round((Nsym×Ndpbs_x−16−6*Nes)/8)−L_ampdu_x
If(Ceiling(L_ampdu_x/4)*4<=(L_ampdu_x+L_padding_x)
Qwordパッドを挿入する。
Else
L_padding_xバイトのファイナルMACパッドを挿入してPSDU生成完了
また、シグナルフィールドは、PSDUフィールドに含まれているデータ及びQwordパッドの大きさを指定する長さフィールドと、データフィールドの変調及びコーディング方法に対する情報を含むMCS(Modulation and Coding Scheme)フィールドと、を含むことができる。また、サービスフィールドは、シグナルフィールドに含まれている情報に基づいて計算されたCRCビットを含むことができる。
Claims (11)
- 無線データ送信のための方法であって、
VHT SIG−A(Very High Throughout Signal−A)フィールドを生成するステップと、
データ単位の長さを示す長さ情報を含むVHT SIG−B(Very High Throughout Signal−B)フィールドを生成するステップと、
サービスフィールド及び前記データ単位を含むVHTデータを生成するステップと、
動作チャネルに渡って、前記VHT SIG−Aフィールド、前記VHT SIG−Bフィールド、及び前記VHTデータを含むPPDU(Physical layer convergence protocol Protocol Data Unit)を送信するステップであって、前記サービスフィールドは、スクランブラ情報およびCRC(Cyclic Redundancy Check)を含み、前記CRCは前記VHT
SIG−Bフィールドにわたって計算され、
前記VHT SIG−Bフィールドは、複数ビットを含んでおり、前記複数ビットの数は、前記動作チャネルのチャネルバンド幅に基づいて決められる、方法。 - 前記チャネルバンド幅が20MHzの場合には、前記複数ビットの前記数は26ビットであり、前記チャネルバンド幅が40MHzの場合には、前記複数ビットの前記数は27ビットであり、前記チャネルバンド幅が40MHzより大きい場合には、前記複数ビットの前記数は29ビットである、請求項1に記載の方法。
- 前記動作チャネルの前記チャネルバンド幅に応じて、前記複数ビットの所定数のコピーを送信するステップをさらに備える、請求項1に記載の方法。
- 前記動作チャネルの前記チャネルバンド幅が40MHzの場合には、前記複数ビットの2つのコピーが送信される、請求項3に記載の方法。
- 前記動作チャネルの前記チャネルバンド幅が80MHzの場合には、前記複数ビットの4つのコピーが送信される、請求項3に記載の方法。
- 前記スクランブラ情報のビット数は7ビットであり、前記CRCのビット数は8ビットである、請求項1に記載の方法。
- 前記データ単位が、PSDU(Physical layer Service Data Unit)であり、前記PPDUは、複数のPSDUを含み、前記PPDUはさらに、前記複数のPSDUの間で、最長の送信持続期間を有する最長のPSDUの持続期間を示す送信持続期間情報を含む、請求項1に記載の方法。
- 前記PSDUが、前記最長の送信持続期間より短い送信持続期間を有するとき、前記複数のPSDUのそれぞれは、前記複数のPSDUのそれぞれに加えられるパディングビットを有する、請求項7に記載の方法。
- 前記VHT SIG−BフィールドがBPSK(Binary Phase Shift Keying)で変調される、請求項1に記載の方法。
- 前記データ単位が、PSDU(Physical layer Service Data Unit)であり、前記長さ情報は、前記PSDUの長さを示す、請求項1に記載の方法。
- 無線データ送信のための装置であって、前記装置は、
信号フィールド生成ユニットであって、
VHT SIG−A(Very High Throughout Signal−A)フィールドを生成し、
データ単位の長さを示す長さ情報を含むVHT SIG−B(Very High Throughout Signal−B)フィールドを生成し、
サービスフィールド及び前記データ単位を含むVHTデータを生成するように構成された、前記信号フィールド生成ユニットと、
送信ユニットであって、動作チャネルに渡って、前記VHT SIG−Aフィールド、前記VHT SIG−Bフィールド、及び前記VHTデータを含むPPDU(Physical layer convergence protocol Protocol Data Unit)を送信するように構成され、前記サービスフィールドは、スクランブラ情報およびCRC(Cyclic Redundancy Check)を含み、前記CRCは前記VHT SIG−Bフィールドにわたって計算される、前記送信ユニットと、
を備え、
前記VHT SIG−Bフィールドは、複数ビットを含んでおり、前記複数ビットの数は、前記動作チャネルのチャネルバンド幅に基づいて決められる、装置。
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KR20100063638 | 2010-07-01 | ||
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KR20100066599 | 2010-07-09 | ||
KR10-2010-0066599 | 2010-07-09 | ||
KR20100066851 | 2010-07-12 | ||
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