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TWI282693B - Physical layer automatic repeat request (ARQ) system - Google Patents

Physical layer automatic repeat request (ARQ) system Download PDF

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Publication number
TWI282693B
TWI282693B TW092128225A TW92128225A TWI282693B TW I282693 B TWI282693 B TW I282693B TW 092128225 A TW092128225 A TW 092128225A TW 92128225 A TW92128225 A TW 92128225A TW I282693 B TWI282693 B TW I282693B
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packet
layer
transmitter
receiver
physical layer
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TW092128225A
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TW200501759A (en
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Joseph A Kwak
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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)
  • Radio Relay Systems (AREA)
  • Small-Scale Networks (AREA)

Description

1282693 五、發明說明（1) 發明所屬之技術領域 本發明係有關於無線通訊系統。更明確地，本發明係 有關於一種運用一實體層（PHY)自動重複要求（ARQ)方案來 對該系統實施之修飾。 先前技術 提出在使用一高速向下連結封包存取（HSDPA)應用 時’利用單一載波—頻域等化（sc —FDE)或正交分頻多重 (OFDM)方法之見頻固定無線存取通訊系統。這種應 ，將以面速度來發送向下連結封包資料。在BFWA中，一建 築，或整群建築物係藉無線式或有線式互相連接，且作為 一單一用戶站地運作。這種系統之資料量需求極大，使單 一站多重用戶者需要大頻寬。 金g目!!提出之系統係運用一第二層自動重複要求（arq) 發二至用戶之封包將緩衝暫存且自第二層 再-人^迗儲存於第二層中之資料區塊典型地較大、以古 訊號雜訊比（SNR)接收而被發送、藉一低區塊誤差 间 (BLER)被接收且不常被重新發送。此外， 声 訊號通常較為緩慢，而需要大的緩衝暫G^ARQ^出 送間隔。 j飞仔杰及長的再次發 緣是，亟需具有除了第二層ARQ系統以外之變型。 内容 一實體層自動要求重複系統包括—發送器及一接收
1282693 五 、發明說明（2) 器"該發送ϋ處之-實體層發送器係接 到之資料格式化成具有一特殃短、討且將该接收 包。該只體層發运裔包個頻道，以發送 二十 f未接收到-給定封包之—相對應確認^因 發送之統計且使用該收集到之絲斗水％ ==益係收集再次 料調變。該接收器具有—實體以化特殊編碼/資 只m廣η -頻返接收器，以垃丨> 士笋 等封包。該接收器包含一η_頻道混合ARQ組合器/解碼器了 且該ARQ組合器/解碼器係用於組合封包 =包：差。該接收器包含一確認訊息發送：馬= :ϊ包具有-可接受誤差率時，發送對於該封包之= =心。，接收Is包含一依序（in_sequence)輸送元件，以 將可接受之封包輸送至較高層。 實施方式 第一 A圖與第一β圖係分別顯示一向下連結實體人叫1〇 與一向上連結實體ARQ 20。 向下連結實體ARQ 1〇包括自設於網路14中之較高層 ARt發送器14a接收封包的一基地台12。來自較高層ARQ發 送益14^之封包將施加至基地台丨2中之實體層ARQ發送器 12a。貫體層ARQ發送器12a係藉一前向誤差校正（FEC)編 碼、附加誤差檢查序列（Ecs)、藉由適應性調變及編碼 (AMC)控制器12c導引且使用二元相移鍵控（BPSK)、正交相 移鍵控（QPSK)、或m元正交振幅調變（亦即16-QAM或64-
第7頁 1282693 五、發明說明（3) QAM)來調變資料。此外，對於正交分頻多重存取 (OFDMA)，實體層AMC控制器12c可改變用於運載封包資料 之子頻道。實體層ARQ發送器12a係藉由開關、循環器 (circulator)或雙工器12d以及天線13，而經由空氣介面4 發送封包至用戶單元1 6。倘若必要時，實體層a jr q發送器 1 2 a亦暫時地將需要再次發送之訊息儲存至包含於實體層 ARQ發送器1 2a中的一緩衝暫存記憶體内。 用戶單元1 6之天線1 5係接收封包。封包係經由開關、 循環器或雙工器16b而輸入至實體層ARQ接收器1 6a中。封 包將在實體層ARQ接收器1 6a中被FEC解碼且使用ECS檢查誤 差。實體層ARQ接收器16a接著將控制確認可訊息ACK發送 器1 6 c ’以確認（A C K )接收到具有一可接受誤差率之一封 包、或著藉由較佳地抑制一確認訊息訊號或發送一負確認 訊息（NAK)來要求再次發送。 ACK係藉ACK發送器16c、經由開關16b及天線15而發送 至基地台1 2。ACK係藉由空氣介面4而發送至基地台12之天 線1 3。接收到之ACK係由該基地台内之一ACK接收器1 2b處 理。ACK接收器12b係將ACK/NAK輸送至適應性調變及編碼 (AMC)控制器12C以及實體層ARQ發送器12a。AMC控制器12c 將利用接收到之ACK的統計來分析連接至用戶單元1 6的頻 道品質’且可改變後續訊息發送之FEC編碼及調變技術， 這將於後作更詳細說明。倘若用戶單元丨6確認了接收到之 封包’則在基地台12處接收到該ACK時將清除暫時儲存於 一緩衝暫存記憶體中之原始封包，以準備提供次一封包使
1282693
# t ί ΐ ΐ Ϊ ； NAK * I，J ^ ^ ^ ARQ 型式至用戶罝-1 /原始心或原始訊息之選擇性修飾 次發送將盥房=私二倘若可ί得，則在用戶單元16處，再 組二，:二二X送紐^合。藉由使周資料備援或選擇重複 ，口，坆種技術將有助於接收一正確訊息。且 誤差率之封包將傳送至較高層16d，以實施更進一步處又 aL。/送可之ΐ收封包係以與提供至該基地台内實體層 (亦^、^料者相同的資料順序輸送至較高層16d
L/園上二再次發送之最大次數係限制於譬如介於 1至8耗園中之一使用者定義整數值。當已 再次發送後，將清除該緩衝暫存記憶體以提·供次一 1在該實體層處解碼使用小型封包之—確認訊息，將# 縮短發送延遲及訊息處理時間。
由於PHY ARQ係發生於該實體層處，因此一特定頻道 發生之再次發送次數、再次發送統計將可作為該頻道品質 之一良好度量基準。使用該再次發送統計，AMC控制器i2c 將可改.變該頻道之調變及編螞方案，如第2圖中所示。此 外，該再次發送統計可組合譬如區塊誤差率（BER)及區塊 誤差率（BLER)等其他鏈結品質度量基準，藉由AMC控制器 1 2c來測定該頻道品質且判定是否需要變更調變及編 案。 、、，為了闡明SC-FDE ’可測量發生於一特定頻道之再次發 送，以產生再次發送統計、（6 0 )。關於是否變更調變方案
1282693 五、發明說明（5) 以策係利用再次發送統計來實施、( 达過罝，則利用通常使資料傳送 氏 人發 及調變方案、（64) 4MC控制器i 2一更強健編碼 更多碼來傳送封包資料。另一選：：:口擴展因數且使用 器可由一高資料處理能力調變方案二換J j二該AMC控制 由64元QAM至16元QAM或QPSK。倘若再-欠發Iff者，譬如 換至-較高容量之調變方案，：：以匕率較低，則切 ΪβΪεΚ 〇 ^ ^ # ^ ^ : ，接收器傳訊之其他鏈結品質度量基準兩者、 (62)。該決策之限制係由系統操作者設定。 、 對於OFDMA，再次發送之發生係用於監測每一子 ^頻道品質。倘一若-特定子頻道之再次發$率或再次發 率/鏈結品質指示出不良品質，則可在⑽⑽頻率集合中" 擇使該子頻道無效、（64)，以排除在某些 時間 中 ，用這種不良品質之子頻道。倘若再次發送率或再以 率/鏈結品質指示出高品質，則可將先前已無效之一子 道加回OFDM頻率集合、（66)。 使用再次發送之發生作為AMC基礎，將可提供每一使 用者彈性定匹配調變及編碼方案、與平均頻道狀況。此 外，再次發送率係對測量誤差以及來自用戶單元26之報主 延遲不敏感。 σ 向上連結實體ARQ 20本質上係相似於向下連結實體 ARQ 10且包括一用戶單元26，在該用戶單元中，來自較高 層28之一較尚層ARQ發送器28a的封包係發送至實體層arq 第10頁 五、發明說明（6) 發送g§26a。訊息係經由開關26d、用戶天線 面4而發送至基地台天線23 eMC控制器26c可、及空氣介 用一頻道之再次發送統計來改變調變及編碼方安5糟使 ^相似於圖1 A中實體層ARQ接收器1 6a之實體ί Α°ΡΛ社 J22a係判定是否具有一可接受誤差率 ' ,收 ARQ發迗器26a再次發送、或另一選為 .貝體層 _發送器2…原始訊息= = : =於實 :訊息。成功接收之封包將發送至網路二以 BFWA tltl ^ ^ # ^ τ〜ii〇jjrA應用，然而亦 1 杂 統可包括-基地台二π戶中；該系 物：：複數個相鄰建築物内之多：：用：務 …站具有眾多終端使用•，而典型 配置於這種系統中之一 PHy Α ρ η么 控制器(MAC)等較高層穿透。結果。m'言如=存取 二層等較高層ARQ使用。在迻籀捧、口 ^〜口 g如第 高層竭上方減少再次發^種清況下，該PHY A顧在較 一 phy卿0之—n-頻道停止及等待結構 的圖式。實體層ARQ發送功織可根據其使用向下連結、霉 1282693 五、發明說明（7) 向上連結、或兩者的PHY ARQ而設置於基地台、用戶單 元、或兩者中。資料區塊34a係來自於網路。網路區塊係 置於一佇列34中，以在空氣介面43之資料頻道41上發送。 N -頻道排序器3 6係將區塊之資料依序地發送至n個挤 器4(M至40-n。每一發送器4(M至4〇1皆連結資料頻道^ 中之一發送序列。每一發送器40-1至40_n皆以？沉編 J供區塊資料ECS ’以產生封包來AMC調變且在資料頻道41 中發送《該FEC編碼/ECS資料係儲存於發送器ay至釣” :二緩衝暫存器中’以用於可能的再次發送。 n ，料爾發送器38發送出，以使在接收器46]控至制 46-η處之接收、解調及解碼同步。 王 間槽中的每一個皆係接收其相關時 ARQ解碼器二至：—n(50)之二 一 j ί 譬如BER或乩⑽等誤差率。倘若該封包呈有 —:π的誤差率，則將釋放該封包至較高階層以作更進 传ϊίΐ:且一ACK將由ACK發送器54發送出。倘若= 糸…、法接党或未接受到任何封包，、/、差率
或將發送出一NAK。具有不可接典則將不發达出任何ACK 存於混合ARQ解碼器5。處：在：：：包將緩衝暫 之封包組合。 吨T此在後續中與一再次發送
(8) * -----——. 1282693 斗;j 加封包係不相同地編碼。為了解碼該封包資料，將由該 』速解碼器處理兩封包，以復原原始資料。由於第二封^ /有不同的編碼’因此其軟符號（sof t symbo 1)將映射 至解碼方案中之不同點。使用具有不同編碼的兩封包將拎 加編碼區隔及發送區隔，以改善總BER。在另一方法中係曰 $輸發送相同訊號。兩接收到之封包係利用一最大比率之 付號組合來組合。接著再解碼該組合訊號。 、 每一接收器46-1至46-η之ACK係在一快速回饋頻道 (FFC)45中傳送。快速回饋頻道（ffc)45較佳地係一低延 時間頻道。對於一分時雙工系統，可在上游與下游發送之 間的無功週期中發送ACK 〇FFC45較佳地係覆蓋其他^頻帶 發送的一低速度、高頻寬分碼多重存取（CDMA)頻道。選擇 FFC CDMA碼及調變，以使對其他同頻帶發送之干擾最小 化。為了增大這種FFC45之容量，可使用多重碼。 ACK接收器56係偵測ACK且指示相對應之發送器仏〜丨至 40-n是否已接收到ACK。倘若未接收到ACK，則將再次發送 封包。再次發送之封包可藉由AMC控制器1 2c、2 6c之指引、 而具有一不同的調變及編碼方案。倘若己接收到ACK，則 發送器40-1至40-η將自緩衝暫存器中清除先前封包且接受 一後續封包以實施發送。 又 發送器及接收器之數量Ν係根據譬如頻道容量及ACK因 應時間等各種設計考慮為基礎。對於上述之較佳系統而 言，較佳地係利用一2-頻道結構·，且具有偶數與奇數個 送器及接收器。 x
1282693 五、發明說明（9) 相較於僅使用較高層ARQ之一系統，較佳具體實施例 之PHY ARQ技術係提供一7db增益之訊號雜訊比（SNR)。這 係因為其操作於較單獨實施較高層Aqr者更高的區塊誤差 率（BLER)(5%至20%BLER)且使用更小的第一層區塊尺寸。 減低之SNR需求允許：藉由運用一適應性調變及編碼（AMC) 技術切換至高階調變以增大容量；藉由使用較低階心（無 線電頻率）組件及藉PHY ARQ補償減低之實施性能以降低用 戶端設傷（CPE)成本；增加向下連結範圍而擴大胞元 (cell)半徑；減少基地台（BS)中之向下連結功率以使胞 元—胞元干擾最小化；以及當運用一多重載波技術時，增 加功率放大器（PA)回退（back-off)。 曰
1282693 圖式簡單說明
第一A圖與第 方塊圖。 —B圖係向下連結與向上連結 實體ARQ之簡化 第二圖係使用再次發送統計來適應性 圖。 第三圖係一多頻道停止及等待結構的 凋變及編碼的流程 方塊圖。 元件符號說明： PHY 實體層 ARQ 自動重複要求 SC-FDE 單一載波頻域等化 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 訊號雜訊比 BLER 區塊誤差率 ACK 確認 MACs 媒體存取控制器 NAK 負確認 FEC 前向誤差校正碼 ECS 誤差檢查序列 AMC 適應性調變及編喝 layer 1 第一層 layer 2 第二層 16d，28 較高層 10 向下連結實體ARQ 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
_ Η
III Μ _l 第15頁 1282693 圖式簡單說明 4，43 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 ，22b ACK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發送功發送器 34 佇列 34a 資料區塊 36 N頻道排序器 41 資料頻道 40-1至40 - n 發送器 45 快速回饋頻道（FFC) 46-1至46 - n 接收器 50 混合ARQ解碼器 54 ACK發送器 50 - 1至50-n混合ARQ解碼器

Claims (1)

  1. 六、申^ 地 一種使用寬瓶η - 台與複數個用2定無線存取的通訊系統，包人$ I 接以；=含-實體層 :料調變、發送：：：封J，=封包具有—特殊編:;亥 L之-相對應確認 1因應未接收到相對應一給定封 -實體層與至少二再次發送封包’言亥通訊系統 的層内，_加的：：=’其通！係被嵌入在該附： 通訊系統包括： ’、q貝體層的資料封包中運載，嗲 5亥發送器係具右_每 該接收到之資料袼二體層發送器，用以接收資料、將 碼/資料調變、發送^ 、封包，各該封包皆具有一特殊編 給定封包之一相對廡"企于包、且因應未接收到相對應一 收器，用以接而再次發送封包、一似接 (AMC)控制器，用於隹^崔涊戒息與一適應性調變及編碼 統計來調整該特殊資“統計且使用該收集之 該接收器，其具有一每雜 包、-混合組合^ 2層；收器’用以解調該封 該 確 存、解碼、及镇测封包用：於該^體層緩衝暫 封包在實體層具有— ；；：”：確認訊息發送器，當 認訊息。 了接又决差率時，發送各封包之一 ^ = 寬頻固定無線存取且包含至少-基地台 統，其包含-發送器mt的：體層η要求重複系 …、接收裔，其中該基地台包含一實
    第17頁 體層發送器，用LV拉☆次1丨 封包，各該封=收;I:、將該接收到之資料格式化成 包、及因庫未=U /f料調變、發送該封 息而再次發送封包，該通訊 了上之一相對應確認訊 加通訊層，其通訊择^ ^使用一貫體層與至少一附 係在該實體層的資料封^ ^附加的層内，該附加的層 該接收到之ΐ料：；收資料、-格式化裝置係將 ^ 付緣編碼/資料調變、一壯 ° 包至接收器、一再次菸详# χ 、衣置以赉送該等封 定封包之-相對應確到相對應-給 收集的再次發送統計以調整各；用在該實體層上所 接收器係具有一裝置;貧料調變；以及 封包的裝置，當該接收之封包具有:接以=收之 以解碼與進行誤差檢查該接收之封2，用 確認訊息於該實體層。 並用以產生與發送一 3· —種使用寬頻固定無線存取的 * 基地台與複數個用戶單元，兮、s %糸、，先，其包含至少— 少-附加通訊層係;統使用-實體層與至 加的層係在該實體層的資料封"J附：的層内’該附 括： τ建載，該通訊系統包 一順序态’具有用於自一網敗力 列，以依序地傳遞封包個發送器；貝料區塊的一作 個發送器其中：一 '、有n個接收态’各該接收器皆連結該η 其中之」'口 ARQ解碼盗’各該解碼器皆轉合該η個接收器 個接發送器依序地經由—資料頻道發送至其相關之η 心 合ARQ解碼器具有一回饋頻道，以將碟認訊息
    送器而控制再次發送1及當已接收到 發送器^及Μ時’提供—確認訊息訊號至其相關之 釋 放 忒η個混合解碼器係將具有一可接受誤差率之封包 4·如申請專利範圍第丨項至第3項其中之一所述之系統，其 中該特殊編碼/資料調變係前向誤差校正（FEC)編碼/資料、 調變。
    5·如申請專利範圍第1項至第3項其中之一所述之系統，其 中該等封包係使用一正交分頻多重存取⑺FDMA)空氣介面 來發送，且該特殊FEC編碼/資料調變調整係在一OFDMA集 合中除了選擇的無效子頻道以外處執行。 6·如申請專利範圍第4項其中之一所述之系統，其中該等 封包係使用具有頻域等化之一單一載波（SC — FDE)空氣介面 來發送。 7 ·如申清專利範圍第1項至第3項其中之一所述之系統，其 中該等確認訊息係在該快速回饋頻道上使用一分碼多重存
    ψ Η 案號92128225_年月曰 修正_ 六、申請專利範圍 取（CDMA)空氣介面發送。 8 ·如申請專利範圍第1項至第3項其中之一所述之系統，更 包含當任一封包具有一不可接受誤差率時，於該接收器處 發送一負確認訊息。
    第20頁
    五、（一）、本案代表圖為：第一a圖 (二）、t案代表圖之元件代表符號簡單說明： 4 10 空氣介面 向下連結實體ARQ 12 基地台 12a 實體層ARQ發送器 12b ACK接收器 12c AMC控制器 12d 循環器\雙工器\開關 13，15 天線 14 網路 14a 較高層A R Q發送器 16 用戶單元 16a 實體層ARQ接收器
    發明摘要（發明名稱：PHYSICAL LAYER AUTOMATIC REPEAT REQUEST (ARQ) SYSTEM) corresponding acknowledgment for a given packet.
    An adaptive modulation and coding controller in the transmitter collects retransmission statistics and adjusts the particular encoding. Data modulations using the collected statistics. The receiver has a physical layer n-channel receiver for receiving the packets. The receiver contains an n-channel hybrid ARQ comb i ner/decoder which
    第3頁 SS_92128225 重複要求系統） 四、中文發明摘要（發明名稱：實體層自動 16b 16c 猶環器\雙工器\開關 ACK發送器
    文發明摘要（發明名稱讀A麵ATIC REPEAT _EST _
    combines and acknowledgment transmitter which transmits an acknowledgement for each packet, if that packet has an acceptable error rate. The receiver contains and in-sequence delivery element which delivers acceptab 1 e packets to higher layers.
    第4頁
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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
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
TW091211156U TW565081U (en) 2001-08-24 2002-07-22 Broadband fixed wireless access (BFWA) 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
TW096116723A TW200814600A (en) 2001-08-24 2002-08-22 Physical layer automatic repeat request (ARQ)
TW092128227A TWI300297B (en) 2001-08-24 2002-08-22 Implementing a physical layer automatic repeat request for a base station
TW095142162A TWI330016B (en) 2001-08-24 2002-08-22 Method for physical layer automatic repeat request for a subscriber unit
TW094129347A TWI315136B (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
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ATE503308T1 (de) 2011-04-15
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