TWI342686B - Reliability detection of channel quality indicator (cqi) and application to outer loop power control - Google Patents

Reliability detection of channel quality indicator (cqi) and application to outer loop power control Download PDF

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TWI342686B
TWI342686B TW095145060A TW95145060A TWI342686B TW I342686 B TWI342686 B TW I342686B TW 095145060 A TW095145060 A TW 095145060A TW 95145060 A TW95145060 A TW 95145060A TW I342686 B TWI342686 B TW I342686B
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cqi
counter
channel quality
messages
base station
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TW200737784A (en
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G Dick Stephen
Rudolf Marian
M Miller James
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Interdigital Tech Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H04W52/0225—Power saving arrangements in terminal devices using monitoring of external events, e.g. the presence of a signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • 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
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • 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
    • 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
    • H04L1/20—Arrangements for detecting or preventing errors in the information received using signal quality detector
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/16—Threshold monitoring
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0058—Allocation criteria
    • H04L5/006—Quality of the received signal, e.g. BER, SNR, water filling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/08—Access restriction or access information delivery, e.g. discovery data delivery
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/12—Outer and inner loops
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/20—TPC being performed according to specific parameters using error rate
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/26—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service]
    • H04W52/262—TPC being performed according to specific parameters using transmission rate or quality of service QoS [Quality of Service] taking into account adaptive modulation and coding [AMC] scheme
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/21—Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • 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
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • 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
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
    • 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
    • H04L2001/125—Arrangements for preventing errors in the return channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/24—Negotiating SLA [Service Level Agreement]; Negotiating QoS [Quality of Service]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Quality & Reliability (AREA)
  • Computer Security & Cryptography (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Description

1342686 九、發明說明： 【發明所屬之技術領域】 本發明大體來說是關於在無線通訊中之頻道品質測量，本 發明尤其是關於一種可靠性偵測頻道品質之方法和裝置，以及 其外功率迴路控制之應用。 【先前技術】
現今’第三代(3G)行動通訊系統已經標準化以執行有效率 且高處理能力之下行通路(DL)封包資料傳輸機制。在基於3G系 統之全球行動電信系統(UMTS)寬頻碼分多重存取(w_cdma) 之背景下，此封包傳輸技術通常是指高速下行通路封包存取 (HSDPA) ’ HSDPA在頻分雙工(FDD)和時分雙工(TDD)下皆是可 行的’且其係以1.28 Mcps及3.84 Mcps之晶片速率執行。 ，、接了來特有之特徵係為HSDPA所被承認之有效性以及可 達成之資料處難力：適應㈣變及編碼麟(AMC) '快速混
合自動重複請求(Hybrid ARQ)、用以即時况頻道品質之上行通 路(UL)報告以速__、鱗f源有效封包難機制、以 及快速短期DL頻道分派。 然而另-種HSDPA可作為區別之特徵係為該資料速率及 力率之總量’—賺趕地⑽祕_鱗傳輸及 触二為該WTRU之即時頻道狀態之功能。舉例來 二率基地台之使用者可卻實地接收到-個具有低發 速率’—個遠離該基地台之使用者，或 疋-個硫不_道狀態之個者，對 DL發送功率僅能以-個降低之資料速率進=刀 5 1342686 取控制(MAC)協定說明書，54〇 (2〇〇3·〇3)中)粗略地列出一些％ CQI值對應於逐漸增高之資料速率，以及㈣越來越高之dl SIRs。在FDD中之該報告卿值係由如下方式取得(依據3 Gpp 丁5 25_214’實體層程序师1))，¥54〇(2〇〇3_〇3)，第6八2節）「证 應該報告表列中最高之CQI值給一單一HS-DSCH次訊框，其係 以HS-PDSCH編碼及之該傳輸區獻小數量格献，其係 相當於該報告歧低之吻值，其係能於—結束第—槽之三時槽 二考期中’其係在該第—槽開始之前，其中該報告CQI值被發 运’且其對於該雜區塊錯誤機率將不會超過G1」。在漏中， 該報告是不_ ’該傳輸區塊大小只有在其於最後-個接收之 發送間隔(最後HS-DSCH接收處時槽之數量），且該發送會產生 一個0.1之區塊錯誤率時才會報告。 、舉例來說，在現行之第5版之W-CDMA FDD中，該CQI係 為個5位元長度之資訊位元序列，其係以一種(2〇, 5) ReedWufc編碼方式進行、糾，編碼出來之2()位元長度序列會 在一而速專用實體控制頻道(hs-dpcchk^中送出，每一個 使ί者ΐ有一個個別_S_DPCCH，其係具有一可調節之CQI 報。循％、(回饋速率），一個使用者能報告在該耶-DPCCH上之該 CQI值’即使該使用者並未接收到在HS-DSCH上之資料。 士舉另一個例子來說，在現rW_cdma TDD版本(3 M Mcps 或高晶片速率(HCR) TDD)中’該CQI係為—個lG位元長度之資 亿位元序列，其係以一種(32，1〇) Reed-Muller編碼方式進行編 =、·扁碼出來之32位元長度之編碼序列會在視為HS_SICH 一部 ^刀之111上送出’在現行的TDD下，一CQI發送僅能發生在如果 。玄使用者事先已經接收訊框中該HS-DSCHJi之資料時。 7 1342686 因為-WTRU之CQI報告之可靠性具有對HSDpA操作之影 響’因此-HSDPA基地台具有—判定⑽是否錯誤接收的裝置 就非常的重要’藉由摒棄任何錯誤接收的CQI，該HSDPA基地 避免歸，兄’其巾其會選擇仙者之沉㈣料及對應的 傳輸功率’其係不適合該使用者所面臨之沉頻道狀態。錯誤的 CQIs會減低該HSDPA對使用者之資料總處理能力，且會對系統 中其他使用者產生高度之干擾，其會減少於w_cdma系統中 HSDPA服務之有效性。 • 除此之外，太多從一特定用者接收之錯誤CQI係使用者的 DL發送功率設定並不精確的一個跡象，而該基地台或另一個存 取網路節點’例如而該基地台或另一個存取網路節點，例如無 線網路控制器(RNC)將會採取適當的動作。舉例來說，能 發送一個較高目標之UL SIR信號至該使用者，以便增加其况發 送功率及將低在HS-DPCCH (FDD中)或HS-SICH (TDD中)之錯 誤率，此種形式之RNC功能通常視為外迴路功率控制。 在W-CDMA FDD和TDD模式下接收UL傳輸之錯誤偵測典 • 型地係藉由執行一種循環冗餘檢查(CRC)來完成，亦即當在基地 台解碼錯誤時，來自資料所伴隨的一位元序列為一可靠的解碼 錯誤之指標。為了讓CRC在錯誤偵測中有作用力，CRC的長度 必須明顯的大很多，然而，為了避免具有不必要的過程，CRC 長度對實際資料長度之比例則需非常的小’在典型的應用上， 該資料可能是幾百位元的序列，而CRC可能只有8-24位元而已。 很不幸地，HS-DPCCH (FDD)以及HS-SICH (TDD)係為快速 LI UL發送信號頻道，其係不包含任何UL資料或充足數量的L1 發送信號位元以有效利用CRC，為了提供足夠數量的錯誤偵測 i 8 性能，CRC至少必須正常地跟資料攔位有—樣的大小才能查 核，在這些考量之下，現行的HSDPA標準並不在Hs_Dpcaj (FDD)以及HS-SICH (TDD)上使用 CRC。 因此’基於現存的技術’網路(基地台或是不具備可靠 判定是否-個CQI是不是被錯誤的接收，網路只能配置該wtru 使用-足夠高的UL發送功率，其係以一沉目標弧及得自模擬 的「經驗」，以致於錯誤的結果不太可能發生，且對於HsDpA 系統之操作也沒什麼傷害，因此提供一種可靠性偵測和報告所 接收CQI值正確性之方法就會很有幫助。 【發明内容】 本發明之方法使得基地台能判定CQI可靠性的程度。本發明 提供一種有用的CQI報告之可靠性偵測機制，其係由HSDpA基 地台接收自一WTRU，且提供一接收之CQI品質報告機制，其係 由該HSDPA基地台至該RNC ’以便追蹤並調整一WTRU之UL 發送功率設定。 一種方法，其係用以在一無線通訊網路中增進一頻道品質 才曰仏(CQI)sK息之可靠性，其開始於接收和解碼該cqi訊息。在 CQI訊息中每一個符號判定之計量值皆會被計算，一個最大的判 定計量值和一第二大之判定計量值係被決定，該CQI訊息之可靠 性係藉由比較該最大判定計量值及該第二大判定計量值來決 定。 一種方法，其係用以在一無線通訊網路中增進一代表一傳 輸頻道品質之一接收訊息之可靠性’其係藉由接收一來自無線 傳輸及接收單元之一頻道品質指標(CQI)訊息所啟始，該CQI訊 1342686 息接著被解碼，且會得到至少兩個不同代表該解碼之CQJ訊息之 值，該CQI&fL息之可罪性係藉由比較該至少兩個值以決定。 一種系統，其係用以在一無線通訊網路中判定一傳輸頻道 之品質，該無線通訊系統包含至少一無線傳輸和接收單元 (WTRU)及-基地台，該WTRU包含產生器以產生一頻道品質指 標(CQI) ’該基地台包含接收裝置以接收該(：(?1，解碼裝置以解 碼該CQI，計异裝置以計算該解碼吻之一第一异!定計量值及一
第二判定計量值’以及比較裝置用以比較該第一和第二判定計 量值以判定是否該CQI包含一錯誤。 -種依據本發明構成之積體電路，其包含—輸人，其係配 置以接收-頻道品質指標(⑺⑽息，解碼褒置以解碼該吻訊 息’計算裝置以計算該解碼⑽之一第一判定計量值及一第二判 定計量值’及比較裂置以比較該第一判定計量值及該第二判定 計量值以判定是否該CQI訊息包含一錯誤。
I由下列描述的較佳具體實酬來更細部地了解本發明， 其以實例提供朗且可以蝴連的伴隨_來了解。 【實施方式】 於一使用的和描述的，-個_包含但並未限制 、使用者裝置’-行動台；—固定或行動用戶單位；一呼叫 於無線環境下操作任何形式之裝置。當之後談論到，一 ίίΐίί但並未限制於—節跳—網點控制器，·—存取點或 在…、線給境下任何形式之介面裝置。 弟一圖所示為— 其應用於根據本發明 種方法100用以判定一Cqi之可靠性，以及 之外迴路功率控制器。該方法100之開始係 10 1342686 藉由初始化一時間間隔計時器及數個計數器，例如總HS-SICHs 接收、錯誤HS-SICHs接收以及已漏失之HS-SICHs數量（步驟 102)，該CQI係被接收(步驟1〇4)及解碼(步驟1〇6)，該兩個最大 判定路由計數值係被評估以判定是否低於門檻值(步驟114)，如 果差異低於門檻值，則該CQI就有錯誤的可能，因此將被丟棄(步 驟116)。 如果差異符合或是超過門檻值，接著該CQI就會被假定為有 效(步驟118)，下一步，該計數器將會增量(步驟12〇)，且不管該 時間間隔是否已經達到終端都會完成一判定(步驟122)，當然， 流程圖就會回到步驟104 ;步驟104-120之迴路就會持續重複下 去，而不管該計數器之值或是該時間間隔是否已經終止。 如果該時間間隔已經終止(步驟122)，則不管該計數器是否 符合或是超過門檻值都會完成一判定(步驟124)，如果該計數器 等於或大於該門檻值，該RNC就會發送信號(步驟126)，該 接著發送該WTRU信號以調整該UL發送功率(步驟丨28)，於是該 方法即終止(步驟Π0) ’如果尚未達料間隔之終點(步驟 122)，或是如果該計數器低於該門檻值(步驟124)，則該方法亦 終止(步驟130)。 值得注意的是，步驟112中之差異判定亦可用於當該計量值 係為對數時，糾絲分貝時，如杲該計量鶴為純數字的話， 則步驟112和114能以下列形式修改。該最大判定計量值與該第 二判定計量值之比係被計算(步驟112)，且該比值係與該門根值 比較(步驟114)。 種近似可供選擇之方法係包含額外的Iub發送簡單週期 性報告之信號，其係HS_S1CHs接收之總數、錯誤HS SICHs接收 1342686 讀量以及HS-SICHs在-固定時間週期所漏失之數量，且報告 這些數量與錯誤Π檻值無闕，這類型之週期性報告將增加更^ 的Iub發送信號，但在節點3中執行起來較不複雜。 第二圖所私另-種綠2GG肋欺—CQi之可靠性及其 應用於根據本發明之外迴路功率控制。該方法細之開始係藉由、 初始化數辦數 l_s_SICHsm、_HS_sieHs^ 以及已漏失之HS_SICHs數量(步驟2〇2)，該c_被接收(步驟 綱)及解碼(步驟施)’對每一在卿中之符號，一判定計量值係 被計算(步驟208) ’該兩個最大之判定計量值係被選擇(步驟 210)，且該兩個最大之判定計量值之間的差異係制定(步驟 犯）’該兩個最大之判定計量值之間的差異係被評估以判定是 ，低於-門難(步驟214)，如果該差異低於該門捏值，則該⑽ 就有錯誤的可能，因此將被去棄(步驟216)。 如果差異超過門摇值，接著該CQI就會被假定為有效(步驟 2:8曰)’下-步’該計數器將會增量(步驟22〇)，且*管該時間間 隔是否已經達到終端都會完成一判定(步驟222)，當然，流程圖 就會回到步驟204 ;步驟204-220之迴路就會持續重複下去，而 不管該計數器之值。 如果該計數器等於或大於該門檻值，該就會發送信號 (步驟224) ’該RNC接著發送該WTRU信號以調整該沉發送功率 (步驟226) ’於是該方法即終止(步驟228)，如果該計數器低於該 門檻值(步驟222)，則該方法亦終止(步驟228)。 當该基地台解碼所接收之32位元碼字元(步驟1〇6, 206),該 ，碼程序之輸出可視作為N無誤假設之…其中該資訊位元之數 里η係與Μ有關，其伽=2n(在TDD中，n=1Q)，換句話說，μ 12 1342686 符號中裡的-個會由WTRU送出至基地台。於該基地台之該假 字母之最適當成員’接著將其轉她資訊位 7八表不該付號，亦即編碼碼字元。 號，法存在以判定什麼是最可能代表接收之符 二虎被送5:ΙΞΓί們所知的符號。舉例來說’如果-特定 提^了-個^村能的事’則合併已知常識_判定演算法
:二二的:路合適的濾波器之該關聯性輸出基本上是-個對 ㈣=」(其卜碼有可能此即為被送 峰表示「mAt3 4於—4序列），而—小關聯性波
中最大的正確的符號」’接著’該32個獲得的波峰 二會被選出’且其會被舰為該被送出去的波峰， ’.、、w疋@統#上的假設測試，平均 =做出的最佳判定，此—程序之實施例示於第」 i定;序轉換所接收之頻道位元之序列成為平穩的 =—可能在M CQI範圍外之符號，_品質指 早積體電路或是作為分離的元件而實施。 訊位元序列(該⑶1字元)係為議元長，該 '/、’碼為—汎n) Reed-Muller編碼，其係恤(=2n) 位兀^碼之位元序列。舉例來說，在伽中，有許师訊 兀乂、W 1024 (Μ = 210)每個長度為N = 32位元的可能的編 13 1342686 碼字元，於該HS-SICH上編碼該CQIi程序提供了一些樣本，其 規劃將每一個該N碼位元成為N*4 = L頻道位元，每一頻道位元 係藉由一個為16之展頻因子展頻(亦即一個16晶片長之展頻序 列）’其結果係為L*16 = C晶片。在TDD中，該CQI字元通常係 以一(32, 10) Reed-Muller編碼方式編碼，而n = 1〇, N = 32, L = 128, C - 2G48。撇開-般性的漏失，該方法之原理同樣地對於 FDD之(16, 5)編碼亦是有效的。 如同熟習此項技藝者所將瞭解的，任何其他形式之編碼組 合也可拿來使用，而本發明並未限制於此文前述之設定方案， 一種藉由頻道編碼理論所熟知之(N，n)編碼方案，以及存在可供 選擇的參數η和Ν可使胁本發明，其斜仪其資雜元之比例 以編碼該頻道位元。舉例來說，也可使用一Reed_MuUer第一或 第二次序碼或是一Reed-S〇l〇mon碼。該特定有關(n，n)位元之編 碼組合並不明顯，只要該解碼器能對每一個符號計算分散之判 定計量值，而且每個符號可於全部的頻道上送出即可。 第一圖之步驟110和112及第二圖之步驟21〇和212表示能判 定CQI可靠性之一個可能方法，許多其他用已判定CQI可靠性之 方法也是可行的，舉例來說，該最大之判定計量值與第二大之 值的比例，或是兩計量值之間的差異以分貝（1〇 l〇g(比例))也可 被使用。以-些簡單的方程式來說明，如果Pnm表示該最大觀測 波峰值’而PSee〇nd表示該第二大之觀測波峰值，該比例(R)就能被 表示為R = Pmax / PseC(md或是l〇g(pmax) / l〇g(ps_d)或是更普遍地 以f(Pmax / Psecond)表示。另一個被提出來用以判定CQI可靠性的方 法係為該最大判定計量值之能量與M-1其他判定計量值之能量 總和或加權總和之比例，舉例來說，厂（丨=〗…32)係為在 14 1342686
Re:d Muller解碼器之輸出所觀測之波峰值，p贿即為朽最大值， 所量測之⑽、表為R = p_/dD。 藉^ ^父該解碼之CQI符號之平穩判定計量值，該基地台能 ，用S簡單以門檻值為基礎之判定機制，以便決定該接受之卿 符號是否有可能有或有可能沒有錯誤(步驟1H，2丨4)，舉例來 說’如果條該最大和第二大計量奴間之該差異小於丨分貝， 就有非^的機率(典型地大於95%)該CQI有錯誤且該卿應 磁摒棄’其他差異值也可使用，但相對的該CQI有錯誤的機率 就會減低，-錄麵差異範_為介跡2分貝之間，以便該 CQI處於錯誤狀態之機率足夠高。 以TDD為例，一個該CQI可靠性偵測方法之實施例在偵測 CQI錯误之能力方面之結果，示於第四圖和第五圖。第四圖和第 五圖之圖示包含在Mud之後BER、ACK -> NACK BER、NACK -> ACK BER、摒棄之CQls、正確但被摒棄之CqIs以及錯誤但卻 未摒棄之CQIs，邊圖示也包含R]yjp BER，其係1〇位元長度CQI 子元之第一位元，且指示該建議調變格式（不是QPSK就是 QAM)。該圖示顯示出該單一位元之BER，該RTBS包含其他九 個在該CQI字元之資訊位元，且其表示該建議傳輸區塊設定，其 係在該HS-DSCH傳輸區塊中資訊位元的數量，其係應該被送出 之該WTRU建議，該圖示顯示出這九個位元之該字元錯誤率 (WER)，其指出九個RTBS位元只少有一錯誤的機率。 下述的言論可由第四圖和第五圖得知：1)該ACK/NACK平 穩判定門檻值係為0.1*信號振幅；2)摒棄一CQI的標準，包含 在振幅上該最高/第二高關聯性波峰小於1分貝；3)錯誤的CQls 能立即地被偵測；以及4)「正確的CQls被錯誤地摒棄」與「錯 15 1342686 誤的CQIs未被摒棄」之比例能輕易地衡量以達到目標錯誤值。 因此，一個進步的CQI範圍編碼可藉由本發明而達成，根據 前述方法，當HS-SICH攜帶ACK/NACK以及該CQI被接收了， 並沒有裝置可瞭解是否該接收之HS-SICH範圍（不是該 ACK/NACK就是該CQI)是否是在錯誤狀態接收，因為其並沒有 CRC，如果該ACK/NACK係於錯誤狀態被接收，而該節點b並 未瞭解這點，舉例來說，該節點B可能重新發送一封包，其係已 經成功地於該WTRU接收或摒棄(未發送)一封包，其係應該已經 被發送，而§亥WTRU等候一延長時間，而該封包將永遠不會到 達且δ亥s己憶體就會延遲。根據本發明之cqi可靠性偵測允許該節 點Β指示哪個接收之HS_SICHs是可靠的而能繼續適當地動作， 就像是重新發送，同樣地，為了時時合理地確保(當接收〈該例 之1%)該HS-SICH係為可靠的，該HS_SICH需要於一高SNR值下 被接收，這表示該WTRU必須於一高功率發送，因為該WTRU 並不具有那麼多功率且可能要讓涵蓋區域達到最大值，該 WTRU發送功率必須足夠以符合平均〇】2HS SICHBER，所提 出之CQI可靠性偵測方法經由報告該CQI提供給該節點B、追蹤 該現行發送功率設定於該WTRUi裝置以及調整該功率設定之 裝置。 除此之外，可靠性偵測方法也能用以提供指標給HSDPA基 地台’及在HS-SICH/HS-DPCCH表現的RNC及CQI報告，以警
IffiSDPA基地台該CQI值可能是錯誤的，透過來自該hsdpa 基地台經由該Iub/Iur網路介面傳至RNC的訊息以警告該傳遞到 SIR可能不適當亦成為可能。簡單的統計資料係被提供，例如有 多少接收自一特定\\〇^1；之接收HS_SICHs係基於CQI計量值而 16 1342686 被宣稱是錯誤的，有多少總HS_SICHs係於同樣的時期内被接 收’以及有多少HI-SICHs係被宣稱根本不需要被送出，這些功 能通常由一CRC提供，而現在因為基於平穩判定計量器之該CQI 可靠性測試而成為可能。 根據本發明一特定的目的，新訊息係被加至該Iub/Iur網路 介面以定義一傳輸發生不合格的數量，以及發生無徵兆接收之 數量，亦即報告一特定的WTRU已經送出X連續的ULHISJCH 訊息而沒有錯誤被報告。 根據有關一特定WTRU或HS-SICH頻道之CQI不合格指標 一預設數量之接收，不是該HSDPA基地台就是該能採取適 當的措施，例如改變該|丁!〇;或該HS_SICH頻道之該功率控制 參數’或疋摒棄CQIs ’以及使用前述DL HSDPA發送之CQI報 告。在本發明的一實施例中(示於第一圖），計數係在2〇〇毫秒時 間間隔内執行，在每一訊框中(其係10毫秒長），至多只會有一 HS-SICH從一WTRU被接收，因此至多在2〇〇毫秒内只有2〇 HS-SICHs ’所有計數器係被定義由〇".2〇(總接收HS SICHs、錯 誤HS-SICHs及漏失HS-SICHs) 〇 即便上述之範例係針對HSDPA TDD，本發明同樣地亦可適 用於HSDPA FDD和其他發送形式，用以獲得‘改善(^可靠性債 測及增進外迴路功率控制，儘管本發明之特定實施例已經揭示 和描述，熟習此技藝者在不脫離本發明之範圍下依然可做許多 修改和隻化，上述描述僅是用以說明而並非以任何方式限定本 發明。 【圖式簡單說明】 17 1342686 第一圖係為根據本發明之方法之流程圖，其係適用於fdd和 TDD。 第二圖係為根據本發明方法之一實施例之流裎圖，其係適用於 FDD和 TDD。 第—圖所示為CQI可罪性偵測之一實施例，其係適用於fdd和 TDD。 第四圖係為一圖式，其係附加的白高斯雜訊(AWGN)頻道 HS-SICH成果，其係來自TDD模擬。 第五圖係為一圖式，其係WG4測試案例2頻道HS-SICH成果，係 來自TDD模擬。 【主要元件符號說明】 100、200 方法 102、104、106、108、110、112、114、118、120、122、124、 126、128、130、202、204、206、208、210、212、214、216、 218'220'222 > 224'226 > 228 步驟

Claims (1)

  1. 十、申請專利範圍： 1. 一種用於在一無線通訊中判斷一頻道品質的方法，包括·· 在一基地台通過一高速共享頻道接收一頻道品質指標 (CQI)訊息； 計數由該基地台於一固定時間週期接收到的一 CQJ訊 息總數、一錯誤的CQI訊息數以及漏失的一 CQI訊息數； 以及 週期性地報告該基地台接收到的該訊息總數、該 錯誤的CQI訊息數以及漏失的該cqi訊息數。 2. —種被配置用於判斷一頻道品質的基地台，包括： 一接收器，被配置用於通過一高速共享頻道接收一頻 道品質指標(CQI)訊息； 一計數器，被配置用於計數接收到的一 cQI訊息總 數、一錯誤的CQI訊息數以及漏失的一 訊息數；以及 一報告裝置，被配置用於週期性地報告於一固定時間 週期接收到的該CQI訊息總數、該錯誤的CQI訊息數以及 漏失的該CQI訊息數。 “ 3. —種被配置用於判斷一頻道品質的基地台，包括： 一接收器，被配置用於通過一高速共享頻道接收一頻 道品質指標(CQI)訊息； 一第一計數器，被配置用於計數接收到的一 c〇I訊幸、 總數； ° ~ ;一第二計數器，被配置用於計數接收到1誤的CQI 一第三計數器，被配置用於計數漏失的一 CQI訊息 1342686
    數；以及 一報告裝置，被配置用於報告於一固定時間週期該第 一計數器、該第二計數器以及該第三計數器的數值。 20
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