TWI333348B - Method for adjusting data modulation at a base station - Google Patents

Method for adjusting data modulation at a base station Download PDF

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TWI333348B
TWI333348B TW095129280A TW95129280A TWI333348B TW I333348 B TWI333348 B TW I333348B TW 095129280 A TW095129280 A TW 095129280A TW 95129280 A TW95129280 A TW 95129280A TW I333348 B TWI333348 B TW I333348B
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packet
channel
layer
arq
packets
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TW095129280A
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TW200726116A (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
    • 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
    • H04L1/1829—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

1333348 · β 九、發明說明： 【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(ΡΗΥ)自動重複要求(ARQ)方案來對該系 統實施之修飾。 【先前技術】
时提出在使用一高速向下連結封包存取(HSDPA)應用時，利 用f 一載波-頻域等化(SC_FDE)或正交分頻多重(〇FDM)方法 f寬巧固定無線存取(BFWA)通訊系統。這種應用將以高速度 來發送向下連結封包資料。在BFWA中，一建築物 築物，無線式或有線式互相連接，且作為一單」用=5 ϋ命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。 μ 提出之系統係運用一第二層自動重複要求(MQ)系 ί ° 發送至用戶之封包將緩衝暫存且自第二層再次發 ί射之資料區塊典魏較Α、喊訊號雜訊比 被重^被發送、藉—舰塊誤差率(BLER)猶收且不常 ，第二層綱發出訊號通常較為緩慢，而 而要大的緩衝暫存器及長的再次發送間隔。 緣疋，亟需具有除了第二層ARQ系統以外之變型。 【發明内容】 發送器包括-發送器及-接收器。該 格式化ίΐ右·!接收資料且將該接收到之資料 發送哭包又w特殊編碼/貧料調變的複數個封包。該實體層 相對應確認訊息而再次發送封包。該發送器中之 1333.348 應性調變及編碼㈣H躲集魏發送之_且使用該收集 到之統計來調整該特殊編碼/資料調變。該接收器具有一 ^ 層η-頻道接收器，以接收該等封包。該接收器包含—打_頻 混合ARQ組合||/解碼||’且該从(？组合||/解碼||係用於組 合封包、解碼封包及偵測封包誤差。該接收器包含一確認 訊息發送器，用於當-封包具有一可接受誤差率時，發送對於 該封包之-確認訊I該接收器包含一依序(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圖與第一3圖係分別顯示一向下連結實體ARQ 10 與一向上連結實體ARQ20。 向下連結實體ARQ 10包括自設於網路14巾之較高層 ARQ發送器14a接收封包的—基地台12。來自較高層 發送器14a之封包將施加至基地台12巾之實體層發送器 12a。實體層ARQ發送器12a係藉一前向誤差校正(FEQ編碼、 =加誤紐查序卵CS)、藉由適雜婦及編碼(AMQ控制 态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(亦即丨叫施或6 來 調變資料。此外，對於正交分存取(〇FDMA)，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(如也㈣或雙工器⑶ ，及天線I3，而、㈣空氣介面4發送封包至用戶單元16。條 若必要時，實體層ARQ發送器12a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12a中的一緩衝暫存 記憶體内。 产^單凡16之天線15係接收封包。封包係經由開關、循 工盗16b而輸入至實體層施3接收器16a中。封包 將在實體層ARQ接收器16a中被FEC解碼且使用ECS檢查 6 誤差。實體層ARQ接收器16a接著將控制確認可訊息ACK 發送器16c，以確認(A’CK)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12。ACK係藉由空氣介面4而發送至基地台12 之天線13。接收到之ACK係由該基地台内之一 ACK接收器 =處理。ACK接收器既係將ACK/NAK輸送至適應性“ 變及，碼(AMC)控制器12c以及實體層arq發送器12ac>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 =,16的頻道品質，且可改變後續訊息發送之舰編碼及調變 ^術，這將於後作更詳細說明。倘若用戶單元16確認了接收 =之，，齡基地台12處接收_ ACK時將清除暫時儲存 j緩衝暫存記憶體中之原始封包，以準傭提供次 用。 U人 倘若未接收到任何ACK或接收到一NAK，則實體 =器12a將再次發送原始訊息或原始訊息之選擇性修飾型 ΐΐΞ戶單元16。倘若可取得’則在用戶單元16處，再^發 f與原始發送組合。藉由使用㈣備援或選擇重複心 =術接收—正確訊息。具有—可接受誤^ =^至，層⑹，以實施更進—步處理。該可接受之= H礼、提供至該基地台内實體層姻3發送器12a之資料 順序輸送至較高層16d(亦即依序發送）。再3 ^最大讀係限制於譬如介於丨至8細中之 】 ^數值。當6嘗試最大魏之料發魏，將清 以提供次-封包使用。在該實騎處解碼使用^^子 之-確認訊息’將可縮短發送延遲及訊息處理時間。J i封包 由於PHY ARQ係發生於該實體層處，因此 生之再次發送次數、再次發送崎將可作為該頻道 好度量基準。使用該再次發送統計，AMC控制器丨及將可改 變^頻道之調變及編碼方案，如第2圖中所示。此外，該再次 ，送統計可組合譬如區塊誤差率(BER)及區塊誤差率(ble 等其他鏈H度量基準，藉*施。控湘以來測定該頻 道品質且判定是否需要變更調變及編碼方案。 ，為了闡明SC-FDE’可測量發生於一特定頻道之再次發 送二以產生再次發送統計、（6〇)。關於是否變更調變方案之一 決策係利祕缝送統計來實施、㈣。倘若再錢送^量， =用通常使資料傳送速率降低的—更強健編碼及調變方 送封包資料。另一選擇或附加地。該AMC控制 料處理能力_方_換至—較低者，譬如自 ^ 譬 * QPSK 至 16 元 QAM 或 64 元 QAM、 (1。該決菜較佳地係利用再次發送率及譬如 ^由該接收器傳訊之其他鏈結品f度量基準兩者 農之限制係由系統操作者設定。 〈）忑决 對於OTDMA ’再次發狀發生係驗朗每—子頻 J若Γ特定子頻道之再讀送率或再次發送率/鏈 …口口質私不出不良品質，則可在〇FDM頻率集人 頻排除在某些未來時_;使用這種^ 道。倘》再次發送率或再次發送率/鏈結品質指 集合同(^。’貞1可將先前6無效之—子頻道加回QFDM頻率 土使用再次發送之發生作為AMC基礎，將可提供每争 配，及編碼方案、與平均頻道狀況^外，再-欠 ^运+係_量誤差以絲自用戶單元16之報告延遲不敏 實體 向上連結實體ARQ 20本質上係相似於向下連結 1333348 10括一用戶單元·26 ’在該用戶單元中，來自較高層 之一較咼層ARQ發送器28a的封包係發送至實體層arq 發迗器26a。訊息係經由開關26d、用戶天線25、 4而發送至基地台天線23。控制器26c可相同地藉使用 一頻道之再次發送統計來改變調變及編碼方案。
。。相似於圖1A中實體層ARQ接收器16a之實體層ARQ接 ，器22a係判定是否具有一可接受誤差率而需要再次發送。確 ，訊息發送器將向用戶單元26報告狀態，而使實體層arq發 送，26&再次發送、或另一選擇為清除暫時儲存於實體層ARQ • 發送器處之原始訊息以準備自較高層28接收次一訊息。 成功接收之封包將發送至網路24以作進一步處理。 儘管為了簡化而未顯示出，但該系統較佳地係用於一 BFWA系統中之一 HSDPA應用，然而亦可使用其他實施。該 BFWA系統可使用分頻雙工或分時雙工SC-FDE或OFDMA。 在這種系統中，基地台及所有用戶皆位於固定位置中。該系統 可包括一基地台及眾多用戶單元。每一用戶單元可服務譬如在 一建築物中或複數個相鄰建築物内之多個使用者。這些應用將 因一用戶單元站具有眾多終端使用者，而典型地需要一大的頻 • 寬。 配置於這種系統中之一 PHY ARQ係可由譬如媒體存取控 制器(MAC)等較高層穿透。結果。PHYARQ可結合譬如第: 層等較高層ARQ使用。在這種情況下，該phy arq將在較 高層ARQ上方減少再次發送。 第3圖係用於一 PHY ARQ30之一 N-頻道停止及等待妗 構的圖式。實體層ARQ發送功能38可根據其使用向下連結二 向上連結、或兩者的PHYARQ而設置於基地台、用戶單^、 或兩者中。資料區塊34a係來自於網路。網路區塊係置於一仔 列34中，以在空氣介面43之資料頻道41上發送。一队頻^ 排序器36係將區塊之資料依序地發送至N個發送器404'至 9 1333348 -發送器糾至翻皆連结資料頻道4 序列。母一發送器40-Γ至40-n皆以FEC編碼且 f= =以產生封包來厦調變且在資料頻道4i ，編碼/ECS資料係儲存於發送器術錢_n之一 =j 益中’以用於可能的再次發送。此外，控制資 ’以使在接收器4一：:： ί —中的每—個皆係接收其相關時間 f 包將發送至—各別之混合解 BLER等誤差率，若該=== iHt貝i將釋放該封包至較高階層以作更進-步處 法接發送器54發送出。倘若誤差率係盔 _不發㈣任何ack ΐ將發 ARQ解J1不可接受誤差率之封包將緩衝暫存於混合 Q解碼$ 50處’而可能在後射與—再次發送之封包組合。 使用加速碼(turbo她)來組合封包之一方法如Τ 口 ==¾ 料封 BFR y- η 將“加編碼區隔及發送區隔，以改盖她 大:ί法中係傳輸發送相同訊號。兩接收到上 _ ζ，率之符敎合來組合。接著再解碼舰合 (FFC& *以。4^至，之皿係在一快速回饋頻道 功-發送 10
寬分碼多重存取(CDMA)頻道。選擇FFC 了增大這種曰對其他同頻帶發送之干擾最梳。為 、裡mu之谷1，可使用多重碼。
$ f收器％係偵測ACK且指示相對應之發送器4(M 误射f 1 2收到ACK。倘若未接收到ACK，則將再次發 再:人發送之封包可藉由遍€控制器12c、26c之指 2而不同的調變及編碼方案。倘若已接收到ACK，則 中織概且接受一 IS 3及接收之數量⑽根據譬如頻道容量及ACK因 種設計考慮為基礎。對於上述之較佳祕而言，較 οσ糸用一 2_頻道結構’且具有偶數與奇數個發送器及接收 較高層狀卩之—系統，較健體實施例之 技術係提供一 7此增益之訊號雜訊比(SNR)。這係 :其操作於鮮獨實施較高層AQR者更高的區塊誤差率 ER)(5/〇至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(αμ^)技術 切換至皆調變以增大容量；藉由使用較低階处(無線電頻率) 組件及藉PHY ARQ補償減低之實施性能崎制戶端設備 (CPE)成本；增加向下連結範圍而擴大胞元(cell)半徑；減少基 =台(BS)中之向下連結功率以使胞元·胞元干擾最小化；以及 备運用一多重载波技術時，增加功率放大器（PA)回退 (back-off)。 【圖式簡單說明】 第一八圖與第一 B圖係向下連結與向上連結實體ARQ之 簡化方塊圖。 ' 第二圖係使用再次發送統計來適應性調變及編碼的流程 1333348 圖。 · 第三圖係一多頻道停止及等待結構的方塊圖β 【主要元件符號說明】 ΡΗΥ 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 ECS 誤差檢查序列 layer 1 第一層
FEC 前向誤差校正碼 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 16d，28 較高層 12 基地台 12b，26b，56 ACK接收器 12c ’ 26c AMC控制器 l2d循環器\雙工器\開關 13，15，25 天線 14，24 網路 4，43 空氣介面 14a 較高層ARQ發送器 12 1333.348
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發送功能發送哭 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 5〇 混合ARQ解碼器 54 ACK發送器 5 Ο-1至5 O-n 混合ARQ解；器

Claims (1)

  1. 年月日修正替換頁 申請專利範圍 L 一種用於在—基地台調整資料調變的方法，其包括·· 中的從—較高層^結構接收-資料區塊 較』:3資料格式化為封包以用於傳輸’該封包的尺寸 料調變Γ 且各封包具有一前向誤差校正(FEC)編碼/資 為各封包序_加—誤差檢查序列； f供實，層ARQ結構，其執行的步驟包括·· 4用-正父分頻多重存取(〇fdma 一緩:發送的該封包儲存在併入於該實=的 封包=確Ϊ回頻道以用於接收表示該等封包已經被接收的各 人發送的數1限制為_操作 在達_整數值時，清除該緩衝記憶=值， 在該貫體層發送器再次發—二 封包以回應於未接收= f是經選擇性修飾的 實體層ARQ結構以及該趣 / ^的—對應確認；其中該 關而透通地運作；”、發运器與該較高層ARQ結構有 在該實體層接峨到的封包； ，被配罟田认、‘，。疋封包的一對應確認， ，二:體層接收器接收及解調複數個接收到的封包； 其 中，被配置 該較高層ARQ結構有關而透通地運作 封包 用 ^接收針對該給定封包的該相應確認的-結構與 在一適應性調變及編碼控制 裔收集一再次發送統計並使用 1333348 2. 3. 4. 5. ^Ε· 9. 3 年月日修正替換頁 該收集的再次發送統計來調整該FEC編碼/資料調變；其中，在 該收集的再次發送統計指示出—低再次發送量的情^;，選擇 :較向容量FEC編碼/資料調變結構，以及，在該收集的再次發 达統計指示高再次發送量的情況下，選擇—較低容量fec 編碼/資料調變結構； 在-組合器/解碼器緩衝、解碼以及僧測複數個封包錯誤； 在-確認產生器產生各接收到的封包的一確認以回應於該 封包具有一可接受的錯誤率；以及 選擇性地使來自-OFDM頻率集合的複數個子頻道無效已 用於該再次發送，其巾，排除仙m的子頻道一段預 定的期間以及將-先前無效的子頻道加回該沉讓鮮集合， 其1’-再次發运率或鏈結品質指示出該先前無效的子頻道的 一南品質。 如申請專繼陳顿述的枝，其巾係制具有頻域等化 之一單-載波(SC-FDE)空氣介面來發送該等封包。 如申請專利細第！項所述的枝，其中，當制—分碼多重 存取(CDMA这氣介面發魏軸包時，麵_道為快速回 饋頻道。 如申請專利範圍第1項所述的方法，更包括： 將-封包識別為具有-不可接受的錯料明應一負確 認的接收。 ====該~構減 15
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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
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TW091211157U TW549775U (en) 2001-08-24 2002-07-22 Broadband fixed wireless access (BFWA) base station having a physical layer automatic repeat request mechanism
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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
TW091119054A TWI261983B (en) 2001-08-24 2002-08-22 Physical layer automatic repeat request (ARQ)
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