TWI300297B - Implementing a physical layer automatic repeat request for a base station - Google Patents

Implementing a physical layer automatic repeat request for a base station Download PDF

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Publication number
TWI300297B
TWI300297B TW092128227A TW92128227A TWI300297B TW I300297 B TWI300297 B TW I300297B TW 092128227 A TW092128227 A TW 092128227A TW 92128227 A TW92128227 A TW 92128227A TW I300297 B TWI300297 B TW I300297B
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Taiwan
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packet
base station
data
transmitter
confirmation
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TW092128227A
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English (en)
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TW200421752A (en
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A Kwak Joseph
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Interdigital Tech Corp
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    • H—ELECTRICITY
    • 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
    • H04B7/2612—Arrangements for wireless medium access control, e.g. by allocating physical layer transmission capacity
    • 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
    • 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
    • H04L1/0033—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter
    • H04L1/0034—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the transmitter where the transmitter decides based on inferences, e.g. use of implicit signalling
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1809—Selective-repeat protocols
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H04L1/1845—Combining techniques, e.g. code combining
    • 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
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1822—Automatic repetition systems, e.g. Van Duuren systems involving configuration of automatic repeat request [ARQ] with parallel processes
    • 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
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0096—Channel splitting in point-to-point links
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/08—Access point devices

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Communication Control (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Small-Scale Networks (AREA)
  • Radio Relay Systems (AREA)

Description

1300297 九、發明說明： 【發明所屬之技術領域】 本發明係關於無線通信系統。尤指一種藉由使用實體層 (physical layer ; PHY)自動重複要求(aut〇matic repeat request ; ARQ)方法而對此系統修正之方法。 【先前技術】 所提出之使用單一載波頻域等化(single carrier-frequency domain equalization; SC-FDE)或正交分頻多重（orthogonal frequency division multiplex ; OFDM)之寬頻固定無線存取 (broadband fixed wireless access ;BFWA)期望使用高速向下連 結封包存取應用（high speed downlink packet access ; HSDPA)。此應用將於高速發送向下連結封包資料。於BFWA 中’一建築或一群建築被以有線或無線的方式連接，並且被視 為一單一用戶位置。此種需要大頻寬之單一端點多重端使用者 之系統的之資料要求非常高。 目前所提出之系統使用第二層自動重複要求系統 (ARQ)。被成功地被發送至用戶之資料區塊從第二層被緩衝及 重新發送。儲存於第二層之資料區塊通常很大，為高的訊號對 雜訊比(signal to noise ratio ;SNR)接收而被發送，以低的區塊誤 差比被接收(block error rate ; BLER)，且不常被重新發送。此 外，第二層ARQ信號通常較慢而需大緩衝器以及長的重新發 送期間。 因此，我們希望在第二層ARQ系統之外有其它的選擇。 【發明内容】 1300297 ^ H體自動要求重複系統包括-發送ϋ以及-接收 為。在發运敗實體層發送器接收資料並將所接收之資料格式 ，成，有特（編碼/資料觀之封包。此實體層發送器包括η 固頻遏’用以發送封包以及回絲接收到一預定封包之相對回 應而重新發送封包。在發额巾之—適應性觀及編碼控制器 收集發送統計並使騎收集之統計調整婦定之編碼/資料調 變。此接收器包括-η頻道混合ARQ結合器/解碼器，其結合 封^發运，解瑪封包並偵測封包誤差。此接收器包括一確認發 送為’其發送每-封包之確認，如果封包具有可接受之誤差 比。此接收器包括一依序發送元件用以傳遞可被接受之封包至 較高層。 【實施方式】 第1A圖及第1B圖分別表示一向下連結實體ARQ1〇及向 上連結實體ARQ20。 向下連結實體ARQ 1〇包括一基地台12用以接收來自網 路14所長：供之較向層ARQ發送器i4a之封包。來自發送器 14a之封包被輸入基地台12中之實體層ARQ發送器12a。此 實體層ARQ發送器12a以一前向誤差校正碼(f〇nvard erf〇r correcting code ; FEC) ’ 附加誤差檢查序列（err〇r check sequences ; ECS)對此資料編碼，受適應性調變及編碼(AMC) 控制器12c指示調變此資料，使用例如二相位變換鍵控(binafy phase shift keying ; BPSK)，正交相位變換鍵控(quadrature phase shift keying，QPSK)或 m 正交振幅調變(m-ary quadrature amplitude modulation ;亦即，i6_qAM 或 64-qAM) 〇 此外，對 於正交分頻多重存取(〇rthog〇nai freqUeney division multiplex 1300297 access ; OFDMA)而言’ AMC控制器i2c可以改變用以承載封 ^ 包資料的子頻道。此實體層ARQ發送器12a經過開關，循環 器或雙工器12d以及天線13而發送封包至用戶單元16。實體 層ARQ發送器12a也暫時儲存重新發送用之訊息，如果需要 的話’於被合併於發送器12a中之緩衝記憶體中。 用戶單元16之天線15接收此封包。此封包經由開關，循 環器或雙工器16b被輸入實體層ARQ接收器16a。在實體層 ARQ接收器16a，此封包被FEC解碼並使用ECS檢查誤差。 接收器16a隨後控制確認發送器i6c以便確認(ACK)具有可接 受誤差比之封包的接收，或藉由，較佳者，扣留一確認訊號或 發送一負確認(NAK)而要求重新發送。 ACK由ACK發送器16c經由開關16b及天線15傳送至 基地台12。此ACK經由空氣介面4被傳送至基地台12之天 線13。被接收之ACK由基地台内之確認接收器i2b處理。此 ACK接收器12b發送此ACK/NCKs至適應性調變及編碼 (AMC)控制器12c以及發送器12a。AMC控制器12c使用所接 收之ACKs之統計分析相對於用戶單元16之頻道品質，並且 可以改變訊息之後續發送之FEC編碼及調變技術，如將被描 述的更多細節。如果用戶單元16確認封包的接收，在基地台 12之此ACK的接收促使暫時被儲存於緩衝記憶體中之原始封 包在下一封包的準備中被清除。 如果沒有ACK被接收或接收到一 NAK，此實體層ARQ 發送器12a重新發送該原始訊息或有選擇性地修改給用戶16 之原始訊息。在用戶單元16中，此重新發送被與原始發送結 1300297 δ ’如果可以的話。此技術糟由使用資料冗餘或選擇的重複結 合而有利於正確訊息的接收。具有可被接受之誤差比之封包被 發送至較高的層16d以進行更一步的處理。此可被接受之被接 收封包以此資料被提供給基地台中之傳輸實體層ARQ發送器 ❿之相同的資料次序(亦即，依序傳輸(in-sequence)發送)被發 送至較高層16d。此重新發送之最大數目被限制於一操作者定 義之整數值，例如範圍1至8的整數。在重新發送之最大次數 被I试之後，緩衝記憶體被清除，以便讓下一封包使用。在實 體層使用小封包解碼一確認訊號可降低發送延遲及訊息處理 時間。 因為PHYARQ發生在實體層，特定頻道之重新發送所發 生的次數，重新發送的統計，係頻道品質之良好測量。使用重 新發送統計此AMC控制器12c可以改變此頻道之調變及編碼 方法’如第2圖所示。此外，重新發送統計也可以與其它的鏈 結_)品質測量結合，例如位元誤差比⑽⑽r _ ;祖) 及區塊誤差比(BLERs)，藉自AMC㈣器以以測量頻道品 質並決疋是否需要改變調變及編碼方式。 為說明SC侧，特定頻道之^新發送發生被測量以產生 重㈣。使用此重新發送統計來決定始是否改變 式’如果重新發送過多，則使贿強的編碼及調 （64) ’通吊在降低的資料傳輸速率。此施C控制器 可以增加擴展因子並使用較多碼以傳輸此封包資料。另- 種方式或料，此AMC控繼可峨
轉換至較低的資料處理m㈣、料里機方式 “ 式，例如從644細至16-QAM 5 。鱗發送的速率低’則做出至較高容量調變方 1300297 式的轉換，例如從QPSK至16卿QAM或糾考QAM，⑽。 此決定最好彻錄發送钱其它從接㈣發號之鍵結 品質測量’如BER或BLER，⑽）。此決定的限制最好由系統 操作者為之。 對OFDMA而5 ’重新發送的發生被用以監視每一次頻道 之頻道品質。如果飾發送率轉定次頻道之錄發送率/鍵 結品質指示較差之品質’該:欠触可能有選擇性地從〇fdm 頻道組中被設定無效’（64)，以防止某些絲週射對此種不 良品質次頻道驗用。如果麵發醉或特定次頻道之重新發 送率/鏈結品質指讀高之品f，綠被設定無效之次頻道可 以被加回至OFDM頻率組，（6句。 使用重新發送的發生做為AMC的基礎提供對每一使用者 之平均頻道情狀霞及編碼方式的。糾，此重新發送 率對於來自用戶單元16之測量誤差及報告延遲而言是不且影 響的。 、 向上連結實體ARQ 20本質上類似向下連結實體ARq 10 ’並包含一用戶單元26，其中來自較高層28之一較高層 ARQ發送器28a之封包被發送至實體層施^發送器加。此 訊息經由開關26d，用戶天線25及空氣介面4被發送至基地 台天線。此AMC控制器’同樣地，可以使用一頻道之重新發 送統計而改變調變及編碼方式。 實體層ARQ接收器22a，類似第1A圖之接收器16a，決 定，訊息是否脑需要觸發送之可接受之誤差比。此輕發 送师報告狀恶給用戶單元％，促使此傳輸實體層ARq發送器 1300297 26a重新發送或清除暫時儲存於傳輸實體層ARQ發送器26a 中之原始訊息，以準備從較高層28接收下一訊息。被成功地 接收的封包被傳送至網路24以做進一步處理。 雖然為簡化之故而沒有表示出來，此系統最好是被用於 BFWA系統中之HSDPA應用，雖然其它的實施方式也可被使 用。BFWA系統可以使用分頻雙工或分時雙工SC-FDE或 OFDMA。於此種系統中，基地台及所有的用戶係位於固定的 位置。此系統可以包括一基地台及大數量的用戶單元。每一用 戶單元可以服務，例如，一楝建築或複數相鄰建築内之數個使 用者。這些應用一般需要較大的頻寬，由於在一用戶單元位置 中之大數目之終端使用者。 在此種系統中之PHY ARQ的展開對較高層而言是明顯 的，例如媒體存取控制器(MACs)。因此，PHYARQ可與較高 層ARQs結合使用，例如第二層。於此情況中，此PHYARq 降低較高層ARQs之重新發送費用。 第3圖說明PHYARQ 30之N頻道停止及等待架構。實體 層ARQ發送功能38可被設置於基地台，用戶單元或依據是否 使用向下連結，向上連結或PHYARQs而定。資料區塊3知從 4路而到達。此網路區塊被放置於空氣介面43之資料頻道41 之發送用之仔列34。N頻道排序器36依據發送區塊資料至N 個發送器40-1至40-n。每-發送器40-1至4〇-n FEC為區塊 資料編碼並提供ESC以產生AMC調變及資料頻道41内之發 送之封包。此FEC編碼/ECS資料為可能產生的重新發送而^ 儲存於發送器40-1至40_n之-緩衝器。此外’控制資訊從 1300297 PHYARQ發送器38被傳送以使接收器46-1至46-n之接收，鲁 ^ 解調變及解碼同步。 ， 每一接收器464至46_n於其相關之時槽内接收封包。被 接收之封包被傳送至個別的混合ARQ解碼器5(M至5〇嘈， (50)。此混合ARQ解碼器50決定每一被接收封包之誤差比， 例如BER或BLER。如果此封包具有可被接受之誤差比，其 被釋放至較高層以做進一步處理，並由ACK發送器54傳送二 ACK。如果誤差比不能被接受或封包未被接收，沒有ack會 被傳送或是傳送一 NAK。具有不可被接受之誤差比的封包在 # 解碼器50中被緩衝處理做為與一重新發送之封包的可能結 合。 、。 使用加速碼(turbo code)結合封包之方法如下所述。如果接 收到具有不被接受之S差比之加速編碼的封包，此封包被重新 發送以有助於編碼結合。包含相同資料之封包被不同地編碼。 為解碼此封包資料，二封包被加速解碼器處理以回復原始資 料。因為第二封包具有不同的編碼，如軟符元(s〇ft啊⑽於 解碼中被對映到不同的點。使用具有不同編碼之二封包增加編籲 碼多樣性及發送多樣性以改善整體BER。於另一方法中，此 相同的信號被發送。此二被接收封包使用結合符元之最大比而 被結合。被結合的信號接著被解碼。 每一接收器46-1至46-n之ACK於一快速回麵道 (FFf )45中被傳送。此快速回饋頻道杉最好是一低延遲頻道。 對刀時雙工系統而έ ’此ACKs可於上游及下游發送之閒置週 期中被傳送。此啊45最好是其它頻勒發送上之低速度， 12 1300297 而頻九CDMA頻道。此FFC CDMA碼及調變被選擇以使頻道 參 内傳輪之干擾最小。為增加此一 FFC 45之容量，可以使用多 重竭。 ACK接收器56偵測ACKs並對相對的發送器40-1至40-n 指示此ACK是否被接收。如果此ACK未被接收，此封包被 重新發送。此被重新發送之封包可具有WAMC控制器12c，26c 所指示之不同的調變及編碼方法。如果ACK被接收，發送器 40-1至40-n從緩衝器中清除先前的封包並接收下一發送封包。 發送器及接收器之數目N係基於不同的設計考量，例如 · 頻道容量及ACK回應時間。對於前述之較佳系統最好使用2 頻道架構，具有偶數及奇數發送器及接收器。 較佳實施例之PHY ARQ技術與僅使用較高層ARQ之系 統相較之下，係提供7 db之訊號對雜訊(SNR)增益，此係藉由 在較高區塊誤差比(BLERs)(5-20%)頻率操作並在第一層使用 小於單獨實施的較高層ARQ之區塊尺寸而發生。降低的SNR 需求允許：藉由使用適應性調變及編碼(AMC)技術切換至高階 調變而增加容量；藉由使用較低等級具有補償降低實施性能之 PHY ARQ的RF(racji〇 freqUenCy)元件而有較低的用戶端設備 (customer premise equipment ; CPE)費用；增加擴展胞元(cell) 半徑之向下連結範圍；基地台(BS)中之降低的功率以使胞元_ 胞元的干擾最小；以及使用多重載波技術（multi-carrier technique )時可有增加的功率放大器(p〇wer ampi迅er ; pA)回退 (back_off)。 13 1300297 【圖式簡單說明】 及1B圖係向下連結及向上連結實體瓣之簡要方塊 第2圖係使_應性調變及編碼之麵發送統計之流程圖。 第3圖係表示多頻道停止及等待架構之方塊圖。 【主要元件符號說明】 ARQ自動重覆複要求 BFWA寬頻固定無線存取 BLER區塊誤差比 MACs媒體存取控制器 FEC前向誤差較校正碼 AMC適應性調變及編碼 layer 2 第二層 10向下連結實體ARQ 12a實體層ARQ發送器 12c，26c AMC 控制器 13，15，25 天線 14a較高層ARQ發送器 PHY實體層 SC_FDE單一載波頻域等化 OFDM正交分頻多重 HSDPA高速向下連結封包存取 SNR訊號對雜訊比 ACK確認 NAK負確認 ECS誤差檢查序列 layer 1 第一層 16d ’ 28較高層 12基地台 12b，26b，56ACK 接收器 12d循環器\雙工器\開關 14，24網路\空氣介面 16，26用戶單元 1300297 16a ’ 22a實體層ARQ接收器 16c發送器 2〇 向上連結實體ARQ 開關 30 PHYARQ 34a資料區塊 16b循環器\雙工器\開關 26a實體層ARQ發送器 28a較高層ARQ發送器 34佇列 36 N頻道排序器
38實體層ARQ發送功發送器 41資料頻道 40-1至40-n N發送器 45快速回饋頻道(FF(：) 46-1至46-n接收器 50 ARQ解碼器 54ACK發送器 50-1至50-n混合ARQ解碼器
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Claims (1)

1300297 申請專利範圍： 種倾實體層自動麵要求之基地台，係包含—發送器與 接收為其巾魏如包含—實體層發㈣，其係 =料Γ變料倾姑，每-桃科-特定編 的確認而重躲、tr封包、麵應未能魏—歡封包之對應 、 子包，—確認接收器，其係用以接收該對摩 用的確認，一適應性調變及編卿器，仰^ ==調變繼顧細該基地台 =應&概及編’控制器魏集重新發 送統計顯枝有少數料^!^_;贿所㈣之重新發 便選定-較締力之辦’朗舰辦及_控制器 ㈣^ , 變方案以作為該特定之編碼/資料 =二 之絲發魏計顯示有許多的重新發送， 較低能力之編碼調變方案 该適應性凋變及編碼控制器便選定 以作為該特定之編碼/資料調變； ；^器/解碼器’伽以緩衝，解碼·測封包誤差；以及 / 有可接狄誤差比，該雜產生ϋ係用以產 生母一封包之一確認， 其中’該等封包係❹具有頻域等化(frequeney d_in 氣介面)翠—載波而被發送。 1300297 2.如申請專利範圍第1項所述之基地台，其中該特定之編碼/資 料調變係使用一前向誤差校正(forward enw e〇rreeti()n，FEC^ 3·如申請專利範圍第！項所述之基地台，其中該等封包係使用 正交分頻多重存取(orthogonal frequeney access ; OFDMA)空氣介面而發送，且執行該FEC編•資__ 調整’除了在-OTDMA組巾之次頻道之選雜的無效之外。 4. 如申請專利範圍第1項所述之基地纟，該基地台係使用分碼 多重存取(CDMA)线介φ，並在—快速_财上發送該確 認。 5. 如申請專利範圍第i項所述之基地台，假使有任何一封包具 有一不可被接受之誤差比時，該確認產生器發送一負確認/、 6. -種基地台所使_實體自_複要求錢，該基地台包含 一發送器’其係可接收資料、為了發送而將所接收之資料格式 化成封包’每-封包具有—特定編碼續料調變，並因應一封包 之未接收的接收確認而重新發送該封包，以及一接收器，其係 用以接收销包、亚騎接收之封包進行觸與職偵測，該 實體自動重複要求裝置係包含： 一收集裝置，翻靴集重新發送統計； 凋整裳置，係使用所收集之重新統計而調整每個特定資料 調變； 一適應性觀及編碼控制器，包含—選定裝置，其係用以在 17 1300297 重新發送統計顯示只有少數的重新發送時，選定 2使所收集蝴細tt__嶋發送 偵測；以及 ==，_物_之編骑料調變: 解碼與侦翁置，係對所接㈣之每個封包進行解碼血誤 一確認裝置，_以在如果所接收到之封包具有—可接受之 誤差比時，在該實體層產生一確認， 又 其中’該等封包係使用具_鱗蜂equeneydomain equalization; SC_FDEs氣介面)單—載波而被發送。 7. 如申請專職圍細中所述之裝置，射該特定之編碼/資 料調變係個，向誤紐正(fG_d e職瞻μ⑽FE〇。 8. 如申請專魏圍6射所述之裝置，其中該等封包係使用正 t#^(〇rthog〇nal frequency division multiplex access ; OFDMA)线介面而料，且細c_/:雜破係被執 行，除了在-OFDMA、组中之次頻道之選擇性的無效之外。 9. 如申請專利細第6項中所述之錢，該基地台係使用分碼 多重存取(CDMA)空氣介面’並在一快速回饋頻道上發送該確 認。 10·如申請專利範圍第6項中所述之裝置，假使有任何一封包具 有一不可被接受之誤差比時，該確認裝置發送一負確認。 1300297 七、指定代表圖： (―)本案指定代表圖為：第3圖。 (二)本代表圖之元件符號簡單說明： 34佇列 34a資料區塊 36 N頻道排序器 38實體層ARQ發送功能\PHYARQ發送器 40-1至40-nN發送器 41資料頻道 46-1至46-n接收器 45快速回饋頻道(FFC) 50 ARQ解碼器 50-1 至 50-n 混合 $ 54ACK發送器 56 ACK接收器 八、本案若有化學式時 請揭示最鋪示發轉_化學式·
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TW091211159U TW565082U (en) 2001-08-24 2002-07-22 Single carrier-frequency domain equalization (SC-FDE) base station having a physical layer automatic repeat request mechanism
TW091211160U TW565075U (en) 2001-08-24 2002-07-22 Orthogonal frequency division multiple access (OFDMA) user equipment having a physical layer automatic repeat request mechanism
TW091211156U TW565081U (en) 2001-08-24 2002-07-22 Broadband fixed wireless access (BFWA) user equipment using a physical layer automatic repeat request mechanism
TW091211154U TW565080U (en) 2001-08-24 2002-07-22 High speed downlink packet access (HSDPA) user equipment using a physical layer automatic repeat request mechanism
TW091211157U TW549775U (en) 2001-08-24 2002-07-22 Broadband fixed wireless access (BFWA) base station having a physical layer automatic repeat request mechanism
TW091211161U TW562343U (en) 2001-08-24 2002-07-22 Orthogonal frequency division multiple access (OFDMA) base station having a physical layer automatic repeat request mechanism
TW091211158U TW563968U (en) 2001-08-24 2002-07-22 Single carrier-frequency domain equalization (SC-FDE) user equipment having a physical layer automatic repeat request mechanism
TW091119054A TWI261983B (en) 2001-08-24 2002-08-22 Physical layer automatic repeat request (ARQ)
TW094129347A TWI315136B (en) 2001-08-24 2002-08-22 Implementing a physical layer automatic repeat request for a subscriber unit
TW092128225A TWI282693B (en) 2001-08-24 2002-08-22 Physical layer automatic repeat request (ARQ) system
TW096116723A TW200814600A (en) 2001-08-24 2002-08-22 Physical layer automatic repeat request (ARQ)
TW098132003A TW201029378A (en) 2001-08-24 2002-08-22 Implementing a physical layer automatic repeat request for a subscriber unit
TW092128227A TWI300297B (en) 2001-08-24 2002-08-22 Implementing a physical layer automatic repeat request for a base station
TW096146937A TW200843399A (en) 2001-08-24 2002-08-22 Implementing a physical layer automatic repeat request for a subscriber unit
TW095142162A TWI330016B (en) 2001-08-24 2002-08-22 Method for physical layer automatic repeat request for a subscriber unit
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TW091211155U TW549774U (en) 2001-08-24 2002-07-22 High speed downlink packet access (HSDPA) base station using a physical layer automatic repeat request mechanism
TW091211159U TW565082U (en) 2001-08-24 2002-07-22 Single carrier-frequency domain equalization (SC-FDE) base station having a physical layer automatic repeat request mechanism
TW091211160U TW565075U (en) 2001-08-24 2002-07-22 Orthogonal frequency division multiple access (OFDMA) user equipment having a physical layer automatic repeat request mechanism
TW091211156U TW565081U (en) 2001-08-24 2002-07-22 Broadband fixed wireless access (BFWA) user equipment using a physical layer automatic repeat request mechanism
TW091211154U TW565080U (en) 2001-08-24 2002-07-22 High speed downlink packet access (HSDPA) user equipment using a physical layer automatic repeat request mechanism
TW091211157U TW549775U (en) 2001-08-24 2002-07-22 Broadband fixed wireless access (BFWA) base station having a physical layer automatic repeat request mechanism
TW091211161U TW562343U (en) 2001-08-24 2002-07-22 Orthogonal frequency division multiple access (OFDMA) base station having a physical layer automatic repeat request mechanism
TW091211158U TW563968U (en) 2001-08-24 2002-07-22 Single carrier-frequency domain equalization (SC-FDE) user equipment having a physical layer automatic repeat request mechanism
TW091119054A TWI261983B (en) 2001-08-24 2002-08-22 Physical layer automatic repeat request (ARQ)
TW094129347A TWI315136B (en) 2001-08-24 2002-08-22 Implementing a physical layer automatic repeat request for a subscriber unit
TW092128225A TWI282693B (en) 2001-08-24 2002-08-22 Physical layer automatic repeat request (ARQ) system
TW096116723A TW200814600A (en) 2001-08-24 2002-08-22 Physical layer automatic repeat request (ARQ)
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TW095129280A TWI333348B (en) 2001-08-24 2002-08-22 Method for adjusting data modulation at a base station

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