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TW200843399A - Implementing a physical layer automatic repeat request for a subscriber unit - Google Patents

Implementing a physical layer automatic repeat request for a subscriber unit
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TW200843399A
TW200843399ATW096146937ATW96146937ATW200843399ATW 200843399 ATW200843399 ATW 200843399ATW 096146937 ATW096146937 ATW 096146937ATW 96146937 ATW96146937 ATW 96146937ATW 200843399 ATW200843399 ATW 200843399A
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packet
physical layer
transmitter
receiver
acknowledgment
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TW096146937A
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Joseph A Kwak
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Interdigital Tech Corp
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200843399 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】 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 5 200843399 料賴之封包。此實體層發送11包括η 應而重新發送=未接預定封包之相對回 Ϊ 騎轉之断輕_定找碼/資料調 射勺料,括一、^道混合ARQ結合器/解碼器,其結合 送^ : Ϊ蛴、、石:封^/貞測封包誤差。此接收器包括-確認發 达母一封包之確認,如果封包具有可接受之誤差 H接收15包括一依序發送元件用以傳遞可被接受之封包至 孕父南層。 【實施方式】 6 第1B圖分別表示一向下連結實體ARQ 10及 向上連結實體ARQ 20。 向下連結實體ARQ 10包括一基地台12 =之較高層ARQ發送器⑷之封包。 H 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—前向誤差校正碼(f〇聰d correcting code ; FEC),附加誤差檢查序列(⑽r如冰 ΓΓΓΤΛΕ(:δ)對此資料編石馬,受適應性調變及編碼_C) 不調變此資料,使用例如二相位變換鍵控 phase Shlft keying ; BPSK),正交相位變換鍵控(quadratu e shift keying; QPS_ m正交振幅調變(maiy职地她 ampl血de modulation ;亦即,l6_QAM 或 64 QAM)。此 於正交分頻多重存取(〇rth〇gonal frequeney divisi()n m ^ aCCeSS;0FDMA)*言’ AMC控制器以可以改變用 ,資料的f頻道。此實體層ARQ發送器12a經過開關,= 為或雙工益12d以及天線13而發送封包至用戶單元16 層ARQ發送器i2a也暫時儲存重新發送用之訊息,^ 的話,於被合併於發送器12a中之緩衝記憶體中。 6 200843399 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(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 發送裔12a重新發送該原始訊息或有選擇性地修改給用戶π 之原始訊息。在用戶單元16中,此重新發送被與原始發送結 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 發送至較南的層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MQ發送器 12a之相同的負料次序(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^ 義^整數值,例如範圍1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。 “ 7 200843399 因為PHY ARQ發生在實體層,特定頻道之重新發送所發 生的=欠數,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^它^ 、、π(1ίη1ί)πσ質測量結合’例如位元誤差比(池err〇r $ bER> f區塊誤差比(BLERs),藉由AMC控制器12c以測量頻道品 貝並決定是否需要改變調變及編碼方式。 她i說明sc_fde,特定頻道之重新發送發生被測量以產生 計’ _ °使用此歸發送統計來決定始是否改變 =二式^(62),°如果重新發送過多’則使用較強的編碼及調 =^ 4) ’通常在降低的資料傳輸速率。此編^控制器 m增加擴展因子並使用較多碼以傳輸此封包資料。另一 轉換控制11可以從高資料處理量調變方式 式的轉換,低’舰出至較高容量調變方 此決定最好使用重抱n ί ^ QAM或64_aiy QAM ’ (66) ° 品質測量如Β ΕΓί 或其它從接收器發出信號之鏈結 操作者為之 或BLER,(62)。此決定的限制最好由系統 之頻ΞΓ質送的發生被_視每—次頻道 結品質指示較發It或特定次頻道之重新發送率/鏈 頻道組中被奴無效,、(64^^可财聰性地從0FDM 良品質次頻道的使用。如 =某些林週期中對此種不 送率/鏈結品質指示較言;送$或特定次頻道之重新發 以被加暇先前被奴無狀次頻道可 之平:ΪΪ的基雜供鱗-使用者 率對於來自用戶單ϋ之^方式的彈性。此外,此重新發送 尸早70 16之測量誤差及報告延遲而言是不具影 8 200843399 響的。 ίο,20本質上類似向下連結實體mq △ 1^亚广3 一用戶早70 26,其中來自較高層28之一較高層 ARQ發送器施之封包被發送至實體層ARQ發送器2:二曰匕 由開關26d,用戶天線25及空氣介面4被發送至基地 口天線。此AMC控制器,同樣地,可 送統計而改_變及編财式。 實體層ARQ接收器22a,類似第1A圖之接收器他,決 息是f具有需Ϊ重新發送之可接受之誤差比。此確認發 ^器報告狀、,給用戶單το 26,促使此傳輸實體層mq發送器 ja重新發送或清除暫時儲存於傳輸實體層arq發送器施 中之原始訊息,醇備從較高層28接收下—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㈣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、统中,基地台及所有的用戶係位於固定的 位Ϊ。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τ〇γ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,PHY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PHYARQ30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34&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 200843399
ίί Ϊ,t宁歹,J 34。N頻道排序器36依據發送區塊資料至N 資ί°每一發送器4(M至4〇_n FEC為區塊 趟供ESC以產±AM(^變及資料頻道4ι内之# 封包二ΛΡΕί:編碼/ECS資料為可能產生的重新發 ‘ ^存於發送n 4(Μ至4G_n之—緩魅。此外,控制 YARQ發送器38被傳送以使接收器俗 接^ 解調變及解侧步。 …之接收, 接攸收器俗1至46_n於其相關之時槽内接收封包。被 ,收之封包郷送至侧的混合施^解碼器5(m至心, 5〇上此混合arq解碼15〇決定每一被接收封包之誤差比, 列 ER或BLER。如果此封包具有可被接受之誤差 豆 =放至較高層峨進―步處理,並由ACK發顧5二 差比不能被接受或封包未被接收,沒有織會 ΝΑΚ。具有不可被接受之誤差比的封包在 ,碼益50中被緩衝處理做為與一重新發送之封包的可能結 使用加速碼(turbo code)結合封包之方法如下所述。如 ^具ί不被接文之誤差比之加速編碼的封包,此封包被重新 編^合。包含相同資料之封包被不同地編碼。 ί H H’,包被加速_器處理以回復原始資 11為第二封包具有不同的編碼,如軟符元(so 解碼中被對映到不_點。使用具有不同編 ) 碼娜及發送多樣性以改善整體BER。於;一 加、: ΐ =信號被發送。此二補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-丨至46_η之ACK 砰c)45巾麵送。絲速_賴45最—mt 對分時雙工系統而言,此ACKS可於上游及;;轉^= 期中被傳送。A FFC 45最好是其它頻道内 200843399 高頻寬CDMA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。 ACK接收器56偵測ACKs並對相對的發送器4(M至4〇-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 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_20o/〇)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(radio frequency)元件而有較低的用戶端設備 (customer premise equipment ; CPE)f ; if ^n#^^it(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ampi迅沉;pA)回退 【圖式簡單說明】 第1A及1β圖係向下連結及向上連結實體ARQs之簡要方塊 〇 ΞΪί用適應性調變及編碼之重新發送統計之流程圖 弟3圖絲示麵道停止及等触構之方塊圖。 200843399 【主要元件符號說明】 PHY實體層 ARQ自動重覆複要求 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 NAK負確認 ECS誤差檢查序列 layer 1 第一層 16d ’ 28較高層 基地台 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 12 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1&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狩列 34a資料區塊 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 54 ACK發送器 50-1至50讯混合ARQ解碼器 56ACK接收器 12

Claims (1)

  1. 200843399 十、申請專利範圍: 1.於-用戶單元調整資料調變的裝置,其包含: 制以;; 該等ΐ:Πΐ料格式1 匕為封包以用於發送’其中該等封包比 4料:靜’且每個封包具有一前向誤差校正(FEC)編碼 發送ϋ封包厂*使用一正交分頻多重存取(〇FDMA)空氣介面來 士,一回復頻道以便接收每一個已接收封包的一確認; 收集重新發送統計; 使用所收集的重新發送統計調整每一 ^,,重新發送統計指示一以== 里、、扁碼/貝枓調變方案作為該特定編碼/資料調變; 及將所重新發送的正交或獅調變封包與所發送的封包結合;以 13 200843399 誤差比。
TW096146937A2001-08-242002-08-22Implementing a physical layer automatic repeat request for a subscriber unitTW200843399A (en)

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US09/939,410US20030039226A1 (en)2001-08-242001-08-24Physical layer automatic repeat request (ARQ)
US10/085,203US20030039220A1 (en)2001-08-242002-02-27Implementing a physical layer automatic repeat request for a subscriber unit

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Application NumberTitlePriority DateFiling Date
TW091211161UTW562343U (en)2001-08-242002-07-22Orthogonal frequency division multiple access (OFDMA) base station having a physical layer automatic repeat request mechanism
TW091211155UTW549774U (en)2001-08-242002-07-22High speed downlink packet access (HSDPA) base station using a physical layer automatic repeat request mechanism
TW091211160UTW565075U (en)2001-08-242002-07-22Orthogonal frequency division multiple access (OFDMA) user equipment having a physical layer automatic repeat request mechanism
TW091211157UTW549775U (en)2001-08-242002-07-22Broadband fixed wireless access (BFWA) base station having a physical layer automatic repeat request mechanism
TW091211154UTW565080U (en)2001-08-242002-07-22High speed downlink packet access (HSDPA) user equipment using a physical layer automatic repeat request mechanism
TW091211156UTW565081U (en)2001-08-242002-07-22Broadband fixed wireless access (BFWA) user equipment using a physical layer automatic repeat request mechanism
TW091211158UTW563968U (en)2001-08-242002-07-22Single carrier-frequency domain equalization (SC-FDE) user equipment having a physical layer automatic repeat request mechanism
TW091211159UTW565082U (en)2001-08-242002-07-22Single carrier-frequency domain equalization (SC-FDE) base station having a physical layer automatic repeat request mechanism
TW094129347ATWI315136B (en)2001-08-242002-08-22Implementing a physical layer automatic repeat request for a subscriber unit
TW092128225ATWI282693B (en)2001-08-242002-08-22Physical layer automatic repeat request (ARQ) system
TW096146937ATW200843399A (en)2001-08-242002-08-22Implementing a physical layer automatic repeat request for a subscriber unit
TW095142162ATWI330016B (en)2001-08-242002-08-22Method for physical layer automatic repeat request for a subscriber unit
TW091119054ATWI261983B (en)2001-08-242002-08-22Physical layer automatic repeat request (ARQ)
TW095129280ATWI333348B (en)2001-08-242002-08-22Method for adjusting data modulation at a base station
TW098132003ATW201029378A (en)2001-08-242002-08-22Implementing a physical layer automatic repeat request for a subscriber unit
TW092128227ATWI300297B (en)2001-08-242002-08-22Implementing a physical layer automatic repeat request for a base station
TW096116723ATW200814600A (en)2001-08-242002-08-22Physical layer automatic repeat request (ARQ)

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TW091211161UTW562343U (en)2001-08-242002-07-22Orthogonal frequency division multiple access (OFDMA) base station having a physical layer automatic repeat request mechanism
TW091211155UTW549774U (en)2001-08-242002-07-22High speed downlink packet access (HSDPA) base station using a physical layer automatic repeat request mechanism
TW091211160UTW565075U (en)2001-08-242002-07-22Orthogonal frequency division multiple access (OFDMA) user equipment having a physical layer automatic repeat request mechanism
TW091211157UTW549775U (en)2001-08-242002-07-22Broadband fixed wireless access (BFWA) base station having a physical layer automatic repeat request mechanism
TW091211154UTW565080U (en)2001-08-242002-07-22High speed downlink packet access (HSDPA) user equipment using a physical layer automatic repeat request mechanism
TW091211156UTW565081U (en)2001-08-242002-07-22Broadband fixed wireless access (BFWA) user equipment using a physical layer automatic repeat request mechanism
TW091211158UTW563968U (en)2001-08-242002-07-22Single carrier-frequency domain equalization (SC-FDE) user equipment having a physical layer automatic repeat request mechanism
TW091211159UTW565082U (en)2001-08-242002-07-22Single carrier-frequency domain equalization (SC-FDE) base station having a physical layer automatic repeat request mechanism
TW094129347ATWI315136B (en)2001-08-242002-08-22Implementing a physical layer automatic repeat request for a subscriber unit
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TW095129280ATWI333348B (en)2001-08-242002-08-22Method for adjusting data modulation at a base station
TW098132003ATW201029378A (en)2001-08-242002-08-22Implementing a physical layer automatic repeat request for a subscriber unit
TW092128227ATWI300297B (en)2001-08-242002-08-22Implementing a physical layer automatic repeat request for a base station
TW096116723ATW200814600A (en)2001-08-242002-08-22Physical layer automatic repeat request (ARQ)

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