TW201029378A - Implementing a physical layer automatic repeat request for a subscriber unit - Google Patents

Implementing a physical layer automatic repeat request for a subscriber unit Download PDF

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Publication number
TW201029378A
TW201029378A TW098132003A TW98132003A TW201029378A TW 201029378 A TW201029378 A TW 201029378A TW 098132003 A TW098132003 A TW 098132003A TW 98132003 A TW98132003 A TW 98132003A TW 201029378 A TW201029378 A TW 201029378A
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Taiwan
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packet
data
physical layer
transmitter
arq
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TW098132003A
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English (en)
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Joseph A Kwak
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Interdigital Tech Corp
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Publication of TW201029378A publication Critical patent/TW201029378A/zh

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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
    • H04L1/12—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
    • H04L1/0001—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
    • 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
    • H04L1/12—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
    • H04L1/1822—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
    • 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
    • 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

201029378 六、發明說明： ί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 ; ΡΗΥ)自動重複要求(automatic 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(ARQ)系統。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 t〇 noise ratio ;SNR)接收而被發送，以低的區塊誤差比被接收(bl〇ck 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】 ,一種實體自動要求重複系統包括一發送器以及一接收器。在 發送器之實體層發送器接收資料並將所接收之資料格式化成具有 201029378 特定編碼/資料觀之封包。此實體層器 應未接收到一預定封包之相對回應發S S所變及編碼控制器收集發送統計並使 頻=合，結合，碼器，其結合封包發送並偵 測封ο誤差。此接收器包括—確認發送器，其發送每—封 認’如果封包具有可接受之誤差比。此接收器包括—依 ^ 件用以傳遞可被接受之封包至較高層。 赞廷疋
【實施方式】 10及向上 第1Α圖及第1Β圖分別表示一向下連結實體AR 連結實體ARQ20。 向下連結實體ARQ 10包括—基地台12肋接絲自網路14 所提供之較高層ARQ發送器i4a之封包。來自發送器丨乜之封包 被=入基地台12中之實體層arq發送器12a。此實體層mq發. 送器 12a 以一刖向誤差校正瑪(f〇rward err〇r ecKje · FEC)，附加誤差檢查序列(errorcheck 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(恤町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，16-QAM 咬 64-QAM)。此外’對於正交分頻多重存取(〇rth〇g〇nal division multiplex access ; OFDMA)而言，AMC 控制器 12c 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15a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 201029378 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16c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(NAjg 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12b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 ❹ 相對於用戶單元16之頻道品質，並且可以改變之後續發送之 FEC編碼及調變技術，如將被描述的更多細部。如果用戶單元μ 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i^結合，如果可以 的話。此技術藉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12a之相同的資料次序 即，依序傳輸(in-sequence)發送)被發送至較高層i6d。此重新發送 之最大數目被限制於一操作者定義之整數值，例如範圍丨至8"的 整數。在重新發送之最大次數被嘗試之後，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PHY ARQ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12〇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(Unk)品質 201029378 測量結合，例如位元誤差比(bit err〇r rates ; BER)及區塊誤差比 12⑽綱峨歧是否需要 ❹ ❹ =明SC-FDE’特定頻道之重新發送發生被測量以產生重新 斗十，（6〇)。使用此重新發送統計來決定始是否改變調變方 =a + 1如果重新發送過多’則使用較強的編碼及調變方式，(64)， =f降低的資料傳輸速率。此AMC控制器丨七可以增加擴展因 =^較多^傳輸此封包資料。另—種方式或此外，此AMC 二以從向資料處理量調變方式轉換至較低的資料處理量方 二，二J叫，至16-QAM或QPSK。如果重新發送的速率 DAM & u至較尚容量調變方式的轉換，例如從QPSK至 接收魏率或其它從 如臟或紐，(62)。此決
頻道發f的發蝴職每—次頻道之 指示較#$。ί^ϊ發科或狀:域道之重新發鮮/鏈結品質 嗖定益效’該次頻道可能有選擇性地從OFDM頻道纪中被 G Ϊΐ某些未來週期中對此種不良品質次頻G 先前被設定無效之次頻道可峨加回謂dJ頻i 平均做為的基礎提供對每一使用者之 於來I…卜’ _發送率對 向上連結實體fit 延遲㈣料具影響的。 包含一用戶單本質上類似向下連結實體ARQ 10，並 28a之封包_$ f、3自較高層28之-較高層ARQ發送器 娜，用戶發㈣此訊息經由開關 制器，同樣地，可以使用1 j皮發送至基地台天線。此顧C控 使用一頻道之重新發送統計而改變調變及編 201029378 碼方式。 實體層ARQ接收器22a，類似第1A圖之接收器16a，決定此 訊息是否具有需要重新發送之可接受之誤差比。此確認發送器報 告狀態給用戶單元26’促使此傳輸實體層ARQ發送器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。 ❹ 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6這些應甩 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(MACsp因此，PHY ARQ可與較高層ARQS 結合使用’例如第二層。於此情況中’此PHY Arq降低較高層 ❺ 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34a從網路而 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 之仵列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4〇-n。每一發送器40-1至40-nFEC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被儲存於發送器4(M至仞七 之一緩衝器。此外’控制資訊從PHYARQ發送器38被傳送以使 接收器46-1至46-n之接收，解調變及解碣同步。 201029378 每一接收器46-1至46-n於其相關之時槽 由接 之封包被傳送細麻合arq解碼器 合ARQ解碼器％決定每一被接收封包之誤差比 BLER。如果此封包具有可被接受之誤差比，' : 做進-步處理，並由ACK發送器54傳送_ ===包未被;收，沒有ACK會被傳送或是不 =Ϊ==在解碼器5〇中被缓衝處理做為與 ❹ ^用加速碼(turbo eode)結合封包之綠如下所述。 至1 ^不被接受之誤差比之加速編碼的封包，此封包被重新發送 碼結合。包含相同資料之封包被不同地編碼。為解碼 此封^料，二封包被加速解碼H處理㈣復原始資料。因為第 -封i具有不同的編碼，如軟符元(SGftsymbGl)於解射被對映到 =的ϋ用具有不_碼之二封包增加編碼多樣性及送 樣^改善整體腿。於另一方法中，此相同的信號被發送。此 收封包使用結合符元之最大比而被結合。被結合的信號接 耆被解碼。 =接收器46-1至46-η之ACK於-快速回饋頻道(FFC)45 ❹中被傳^。此快速回饋頻道45最好是一低延遲頻道。對分時雙工 系統而言，此ACKs可於上游及下游發送之閒置週期中被傳送。 此FFC 45最好是其它頻道内發送上之低速度，高頻寬(：1)]^頻 道。此FFC CDMA碼及調變被選擇以使頻道内傳輸之干擾最小。 為增加此一 FFC 45之容量，可以使用多重碼。 一 ACK^收器56偵測ACKs並對相對的發送器40-1至40-n指 不此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如AMC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4(M i4〇_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 201029378 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ρΗγ 的 RF(mdi〇 frequency)元件而有較低的用戶端設備(cust〇mer premise ❹ equipment; CPE)費用；增加擴展胞元(ceU)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；^及使用 多重載波技術（multi-carrier technique)時可有增加的功率放大 (power amplifier; PA)回退（back-off)。 【圖式簡單說明】 第1A及1B圖係向下連結及向上連結實體 第2圖係使用賴性調變及編碼之重新方塊圖 第3圖係表示多頻道停止及等待架構之方塊圖。w程圖。 ® 【主要元件符號說明】 PHY實體層 ARQ自動重複要求 SC-FDE單一體波頻域均化 OFDM正交分頻多重 BFWA寬頻固定無線存取 HSDPA高速向下連結封包存取 SNR訊號對雜訊比 BLER區塊誤差比 ACK確認 201029378 MACs媒體存取控制器 NAK 負確認 FEC前向誤差較校正碼 ECS誤差檢查序列 AMC適應性調變及編碼 layer 1 第一層 layer 2 第二層 16d，28較高層 10向下連結實體ARQ ❹ 12基地台 12a實體層ARQ發送器 12b，26b，56 ACK 接收器 12c，26c AMC 控制器 12d循環器\雙工器\開關 13，15，25 天線 14，24網路\空氣介面 14a較高層ARQ發送器 .16，26用戶單元 16a，22a實體層ARQ接收器 ® 16b循環器\雙工器\開關 16c發送器 20 向上連結實體ARQ 26a實體層ARQ發送器 26d開關
28a較高層ARQ發送器 30 PHYARQ 38實體層ARQ發送功能卬取八!^發送器 34佇列 34a資料區塊 201029378 36 N頻道排序器 41資料頻道 40-1至40-n N發送器 45快速回饋頻道(FFC) 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 56 ACK接收器 ❹
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Claims (1)

  1. 201029378 七、申請專利範圍·· 1.使用者方法，包含： 輪之資 料; -較高層自動重複要求(ARQ)機制，用以產生用於傳 一實體層發送器，用以. ❹ 鲁 將3接收的資料格式化為望 包比該等資料區塊來得小 該等封 J二預性修改封包 ARQiS=T機制及實體層發送器相對於該較高層 統叶.一實體賴㈣，肋接收及解斯触麟包及重新發送 之一ZtCKf送器’用以發送在該實體層接收器處之一給定封包 二對應確認，其中_接收該給定封包之該賴顧之一機制 相對於該較高層ARQ機制透明地運作;及 二適應性，變及控制(AMC)單元，用以使用所收集的重新發 重二计，調整每=封包的特定編碼及資料調變’其中當所收集的 次2發送統計指示一低重新發送數量，則選擇一較高容量編碼及 變方案作為該特定編碼及資料峨，而當所收集的重新發 指示一高，新發送數量，則選擇一較低容量編碼及資料調 案作為該特定編碼/資料調變’其中選擇性地使來自一〇FDM Λ率組中的次頻道無效，以阻止一惡劣品質次頻道的使用一預定 12 201029378 週期’並將—先前無效的次頻道加回至該OFDM頻率組中， 接續重新發送率或連結品質指示該先前無效的次頻道的一二^ 質。 巧品 1如申請專利範圍第1項所述的使用者設備’其中該等封包使 有一頻域等化(SC-FDE)空氣介面的一單一載波來發送。 具 〇 ❹ 13
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US09/939,410 US20030039226A1 (en) 2001-08-24 2001-08-24 Physical layer automatic repeat request (ARQ)
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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
TW091211156U TW565081U (en) 2001-08-24 2002-07-22 Broadband fixed wireless access (BFWA) user equipment using 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
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
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
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
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
TW091211157U TW549775U (en) 2001-08-24 2002-07-22 Broadband fixed wireless access (BFWA) base station having a physical layer automatic repeat request mechanism
TW091119054A TWI261983B (en) 2001-08-24 2002-08-22 Physical layer automatic repeat request (ARQ)
TW096146937A TW200843399A (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
TW096116723A TW200814600A (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
TW098132003A TW201029378A (en) 2001-08-24 2002-08-22 Implementing a physical layer automatic repeat request for a subscriber unit
TW095129280A TWI333348B (en) 2001-08-24 2002-08-22 Method for adjusting data modulation at a base station
TW095142162A TWI330016B (en) 2001-08-24 2002-08-22 Method for 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

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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
TW091211156U TW565081U (en) 2001-08-24 2002-07-22 Broadband fixed wireless access (BFWA) user equipment using 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
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
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
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
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
TW091211157U TW549775U (en) 2001-08-24 2002-07-22 Broadband fixed wireless access (BFWA) base station having a physical layer automatic repeat request mechanism
TW091119054A TWI261983B (en) 2001-08-24 2002-08-22 Physical layer automatic repeat request (ARQ)
TW096146937A TW200843399A (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
TW096116723A TW200814600A (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

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TW092128225A TWI282693B (en) 2001-08-24 2002-08-22 Physical layer automatic repeat request (ARQ) system

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