TWI406516B - 控制下鏈增強上鏈頻道功率偏差的裝置 - Google Patents

控制下鏈增強上鏈頻道功率偏差的裝置 Download PDF

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TWI406516B
TWI406516B TW98101110A TW98101110A TWI406516B TW I406516 B TWI406516 B TW I406516B TW 98101110 A TW98101110 A TW 98101110A TW 98101110 A TW98101110 A TW 98101110A TW I406516 B TWI406516 B TW I406516B
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wtru
eu
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dch
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TW200943765A (en
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Guodong Zhang
Stephen E Terry
Stephen G Dick
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Interdigital Tech Corp
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/18TPC being performed according to specific parameters
    • H04W52/20TPC being performed according to specific parameters using error rate
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements 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
    • H04L1/18Automatic repetition systems, e.g. van Duuren system ; ARQ protocols
    • H04L1/1867Arrangements specific to the transmitter end
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/06TPC algorithms
    • H04W52/16Deriving transmission power values from another channel
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/18TPC being performed according to specific parameters
    • H04W52/22TPC being performed according to specific parameters taking into account previous information or commands
    • H04W52/225Calculation of statistics, e.g. average, variance
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W52/00Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04TPC
    • H04W52/30TPC using constraints in the total amount of available transmission power
    • H04W52/32TPC of broadcast or control channels
    • H04W52/325Power control of control or pilot channels

Description

控制下鏈增強上鏈頻道功率偏差的裝置

本發明是關於一種無線通信系統,其包含一無線傳輸/接收單元(WTRU)、至少一節點B以及一無線網路控制器(RNC)。本發明尤其是關於一種方法及系統系統,用以控制一下鏈(DL)增強上鏈(EU)發信頻道,其係基於由該WTRU及/或該節點B,向該RNC所報告之增強上鏈(EU)傳輸及排程資訊接收失效統計,使得該增強專用頻道(E-DCH)下鏈發信頻道更可靠。

用以改善上鏈(UL)覆蓋、生產能力以及傳輸延遲時間之方法,現今在第三代夥伴計畫(3GPP)第6版(R6)中已經有所研究。為了達成這些目標,節點B將接管排程和分派上鏈資源給WTRUs之責任,節點B能做出更有效率的決定,且管理以短程為基礎之無線資源會比RNC較好,即便RNC維持著普遍的整體控制。

一種稱作MAC-e新的增強上鏈(EU)之媒體存取控制(MAC)功能/實體已經被設計在WTRU和節點B之內,以便掌控E-DCH傳輸之傳輸和接收,為了適當地支援EU,例如頻道配置、傳輸回饋(亦即確認(ACK)或非確認(NACK))、以及其他的回饋資訊(例如功率控制命令或是頻道品質)等資訊,必須經由一DL EU發信頻道有效且可靠地傳輸至WTRU。

在共享DL EU發信頻道上之功率控制,對支援DL EU發信頻道 之適當運作是不可或缺的,功率控制降低整體干擾,且因此會使得無線資源的使用更有效率。

本發明是一種用以控制至少一DL EU發信頻道之傳輸功率之方法和系統,使得E-DCH DL信號有效且可靠地送抵WTRU,對於特定WTRUs專用之DL信號發送,該DL EU發信頻道之傳輸功率係基於現行DL專用控制頻道功率加上一功率偏差,對於多重WTRUs共享所用之DL信號發送,該DL EU發信頻道之傳輸功率係基於由該RNC之功率設定加上一功率偏差。該RNC監控由節點B和WTRU所報告之EU傳輸失效統計,用以評估NACK對ACK之誤譯統計。

該節點B報告在該節點日上之該EU傳輸失效之統計給該RNC,而該WTRU報告在該WTRU上之該EU傳輸失效之統計給該RNC。該RNC接著根據所評估的NACK對ACK之誤譯統計,調整NACK對ACK功率比。當該節點B發送頻道配置資訊給WTRU之後,而該WTRU並未初始EU傳輸之時,或是E-DCH傳輸之資料率/頻率與頻道配置資訊中所記載的不同時,該節點B藉由偵測來計算失效的排程資訊(亦即頻道配置資訊)接收統計。

當請求發出之後一特定的時期之內,如沒有回應該EU頻道配置請求,則該WTRU亦可藉由偵測來計算失效排程資訊接收統計。該RNC監控由該WTRU和該節點B報告之失效排程資訊接收統計,以評估排程資訊接收錯誤的統計。該RNC調整排程資訊範圍 的功率偏差,其係基於排程資訊接收失效之統計。

藉由下文中一較佳實施例之描述、所給予的範例,參照對應的圖式,本發明可獲得更詳細地瞭解。

此後,專用術語「WTRU」包含但並未限制於一使用者設備(UE)、一行動台、一固定或行動用戶單元、一呼叫器或可在一無線環境下操作之任何形式之裝置。當本文此後提到專用術語「節點B」,其包含但並未限制於一基地台、一站台控制器、一存取點或是在無線環境下任何結識的介面裝置。

本發明之特徵可整合至一積體電路(IC),或是配置在包含許多相互連接元件之電路上。

第1圖係為根據本發明之一無線通信系統100。該系統100包含一WTRU 102、至少一節點B 104以及一RNC 106。該RNC藉由配置該節點B 104及該WTRU 102之EU參數來控制整體的EU運作,像是初始傳輸功率位準、最大允許EU傳輸傳輸功率、或是每節點B之空餘頻道資源。在該WTRU 102及該節點B 104之間,係建立一專用實體控制頻道(DPCCH)114、一E-DCH 108、一UL EU發信頻道112以及DL EU發信頻道110。

關於E-DCH傳輸,該WTRU 102經由該E-DCH 108或是該UL EU發信頻道112,發送一E-DCH配置請求至該節點B 104,在回應方面,該節點B 104經由一DL EU發信頻道,發送頻道配置資訊給 該WTRU 102。在EU無線資源配置給WTRU 102之後,該WTRU經由該E-DCH 108傳輸資料,因應該E-DCH傳輸,該節點B 104經由該DL EU發信頻道110發送混合自動重複請求(H-ARQ)之一ACk或NACK。

當該WTRU 102被該RNC 106配置在該E-DCH 108上運作時,每一經由該DL EU發信頻道110傳輸之資訊範圍之功率偏差(例如ACK/NACK、排程資訊等等),也是由該RNC 106所配置,並且經由Iub/Iur 108發送至該節點B 104,這些初始功率偏差係由該RNC決定,其係基於該資訊範圍之需要錯誤機率,在該E-DCH 108運作期間,在該DL EU發信頻道110上之該資訊範圍之功率偏差,需要根據該DL EU發信頻道110之確實經驗之服務品質來調整。

對於特定的WTRUs 102專用之DL信號而言,該DL EU發信頻道110之傳輸功率,係基於該現行DL專用控制頻道功率加上一功率偏差。對於多重WTRUs 102共享之DL信號而言,該DL EU發信頻道110之傳輸功率係基於由該RNC 106所設定之功率位準加上一功率偏差。

對每一WTRU 102而言,該DL EU發信頻道110之傳輸功率係分開地控制,對於特定WTRU102之DL EU發信頻道110之傳輸功率之決定,就如同該WTRU 102之該DL專用實體控制頻道(DPCCH)114之傳輸功率加上一功率偏差,依理推斷,DPCCH之功率乃作為參考,該WTRU 102之DPCCH之傳輸功率,係根據全球行動通訊 服務(UMTS)於99/4/5所釋出之標準控制。

根據資訊(亦即ACK/NACK、頻道品質回饋、排程資訊等等),會由節點B 104發出不同的功率偏差。對於ACK/NACK資訊範圍而言,較高的功率偏差會被用來傳輸NACK而非傳輸ACK,因為NACK對ACK誤譯會引起比ACK對NACK誤譯更嚴重的問題。

第2圖係為由該系統100所執行之一程序200,其係根據本發明,用以執行在DL EU發信頻道110上之傳輸功率控制。該RNC 106發送該DL EU發信頻道110之一功率偏差之初始配置給節點B 104(步驟202)。該RNC 106監控失效的MAC-e傳輸及/或失效的頻道配置資訊接收統計,其係由該WTRU 102及/或該節點B 104所報告,以便評估在該DL EU發信頻道110上接收和傳輸之錯誤機率(步驟204、206)。在步驟207中,該RNC 106評估NACK對ACK誤譯之統計,其係基於該報告之失效MAC-e傳輸統計,如果評估該NACK對ACK誤譯之統計高於一閾值,則該RNC 106調整該NACK對ACK功率比(亦即功率偏差比),基於接收來自該WTRU 102及該節點B 104之失效頻道配置資訊接收統計,該RNC 106因此調整該排程資訊之功率偏差(步驟208)。藉此方式,EU的適當運作將會維持良好,且無線資源也來有校地使用。

第3圖係為根據本發明之一實施例之流程圖,其係一程序300,用以控制一DL EU發信頻道之傳輸功率。該WTRU 102係配置給EU運作(步驟302),該WTRU決定是否有資料要經由E-DCH 108傳輸(步驟304),如果有資料要傳輸,則該WTRU 102透過E-DCH 108或是UL EU發信頻道112發送一頻道配置請求給節點B(步驟306),該節點B 104接收該請求,並經由該DL EU發信頻道110發送頻道配置資訊給該WTRU 102(步驟308)。

在發送該頻道配置請求之後,該WTRU 102為了頻道配置資訊監控該DL EU發信頻道110,該節點B亦在經由該DL EU發信頻道110發送頻道配置資訊後,進行E-DCH傳輸之監控(步驟310)。

送給該WTRU 102之該頻道配置資訊可能無法成功送達,頻道配置資訊之失效傳輸的下場端視該配置會如何執行。對於決定型的配置而言,該WTRU 102根本不會傳輸,而對於統計型的配置而言,該WTRU可能也不會傳輸,不然就是以不同於該頻道配置資訊所記載之速率及/或持續位準傳輸資料。

決定型配置是一種配置方式,其中最大配置傳輸功率及/或資料率都是特定的,且該WTRU 102可於任何時刻傳輸,只要他的傳輸功率及/或資料率不超出最大值即可。統計型配置是另一種配置方式,其中除了特定的最大配置傳輸功率及/或資料率之外,持續位準(機率)亦是特定的,該WTRU 102可根據持續位準接續傳輸,或是以由該持續位準所決定的傳輸功率及/或資料率進行傳輸。

當該節點B 104發送該頻道配置資訊之後,或是E-DCH傳輸之資料率/頻率與在該頻道配置資訊內記載不同時,若該WTRU 102並未初始EU傳輸,則該節點B 104藉由偵測來計算且報告失效排程 資訊接收統計(步驟312),此可基於一接收功率閾值。當在該頻道配置請求傳輸後,在一特定時間週期內沒有對EU頻道配置請求回應的話,該WTRU 102亦可藉由偵測還計算且報告失效排程資訊接收統計(步驟312)。

如果頻道配置資訊之失效傳輸統計高於一預設閾值,該RNC 106會增加在該DL EU發信頻道110上之排程資訊領域之傳輸功率(步驟314),該RNC經由Iub/Iur 118發出調整功率偏差的信號。

第4圖係為根據本發明另一實施例之流程圖,其係為一程序400,用以控制一DL EU發信頻道110之傳輸功率。在步驟402,在該WTRU 102配置給EU運作,且收到頻道配置資訊之後,該WTRU 102便經由該E-DCH 108傳輸資料(步驟404),該節點B 104接收和解碼該資料。該節點B 104接著根據所解碼之資料發送回饋資訊(亦即ACK或NACK)給該WTRU 102(步驟406)。

該WTRU 102及/或該節點B 104計算MAC-e失效統計,並且報告給RNC 106,以便調整NACK對ACK比(亦即功率偏差比)(步驟408)。根據一實施例,該WTRU 102報告在該WTRU 102上MAC-e失效之數目,其係未能成功傳輸的資料區塊數量。當一資料區塊因為達到如重新傳輸之最大量或是資料區塊最大延遲,而造成在MAC-e上無法傳輸時,一MAC-e失效就會發生。該節點B 104在該節點B 104上報告該WTRU 102之MAC-e失效數量,其係在節點B 104中之MAC-e上未能成功接收的資料區塊數量。

有時,WTRU 102解譯為成功傳輸的資料區塊,實際上可能並未由節點B 104成功的接收,因為該資料區塊之NACK係誤譯為在WTRU 102上的ACK。該RNC106會決定該WTRU 102之NACK對ACK誤譯數量,亦即由節點B所報告之WTRU 102之MAC-e失效數量,減去由該WTRU 102所報告該WTRU 102之MAC-e失效數量。

否則,該RNC 106可利用在RNC 106上WTRU 102之E-DCH資料之無線鏈結控制(RLC)復原請求之數量,來決定NACK對ACK誤譯之數量,其可由RNC 106內部收集或是計算。WTRU 102解譯為傳輸成功的資料區塊,可能在稍後因為NACK對ACK誤譯,而有該資料之RLC復原請求。該RNC 106決定該WTRU 102之NACK對ACK誤譯數量,亦即在該RNC 106上之該WTRU 102之該E-DCH資料之RLC復原請求數量,減去由該WTRU 102報告之WTRU 102之MAC-e失效數量。

在該WTRU 102上之該WTRU 102之MAC-e失效統計,係經由RRC程序向RNC 106報告,且在該節點B 104上之該WTRU 102之該MAC-e失效統計,係經由Iub/Iur 118向該RNC 106報告。

如果該NACK對ACK誤譯機率高於一預設閾值,則該RNC 106便會增加該NACK對ACK功率偏差之功率比(步驟410)。由於有較高的功率偏差,NACK將更可靠地送抵該WTRU,該RNC 106經由Iub/Iur 118發送調整ACK及NACK功率偏差之信號(或是ACK和NACK之間的功率比),且該節點B 104使用該功率偏差/比來設定 該EU DL發信頻道之傳輸功率。

儘管本發明之特徵和元件皆於實施例中以特定組合方式所描述,但實施例中每一特徵或元件能獨自使用,而不需與其他特徵或元件組合,亦能與/不與本發明之其他特徵和元件做不同之組合。

100‧‧‧無線通信系統

102‧‧‧無線傳輸/接收單元(WTRU)

104‧‧‧節點B

106‧‧‧無線網路控制器(RNC)

108‧‧‧增強專用頻道(E-DCH)

110‧‧‧下鏈增強上鏈發信頻道

112‧‧‧上鏈增強上鏈發信頻道

114‧‧‧專用實體控制頻道(DPCCH)

200‧‧‧程序

第1圖係為根據本發明之一無線通信系統之方塊圖;第2圖係為第1圖之系統元件間之信號圖,其係用以執行在一DL EU發信頻道上根據本發明之傳輸功率控制;第3圖係為根據本發明之一實施例,用以執行在一DL EU發信頻道上之傳輸功率控制之程序流程圖;以及第4圖係為本發明之另一實施例,用以執行在一DL EU發信頻道上之傳輸功率控制之程序流程圖。

102‧‧‧無線傳輸接收單元(WTRU)

104‧‧‧節點B

106‧‧‧無線網路控制器(RNC)

200‧‧‧程序

Claims (9)

  1. 一種控制至少一下鏈(DL)增強上鏈(EU)頻道功率偏差的無線傳輸/接收單元(WTRU),包括:一增強專用頻道(E-DCH)頻道;一上鏈(UL)增強上鏈(EU)頻道;一下鏈(DL)增強上鏈(EU)頻道;其中該WTRU經由一傳輸器以經由該E-DCH頻道或該UL EU頻道其中之一發送一E-DCH配置請求;其中,回應於該E-DCH配置請求,該WTRU針對經由該WTRU的天線接收的頻道配置資訊來監控DL EU;其中,在關於該UL EU頻道的一測量符合一預設閾值的情況下,調整該DL EU的傳輸功率偏差,其中該測量是藉由從一節點B所報告的該WTRU的一EU媒體存取控制(MAC-e)失效數量減去該WTRU所報告的該WTRU的一MAC-e失效數量而作出。
  2. 如申請專利範圍第1項所述的無線傳輸/接收單元(WTRU),其中該測量涉及該WTRU是否經由該UL EU來起始EU信號傳輸以回應於接收到該頻道配置資訊。
  3. 如申請專利範圍第1項所述的無線傳輸/接收單元(WTRU),其中該測量涉及來自該WTRU的E-DCH傳輸是否根據該頻道配置資訊而作出。
  4. 如申請專利範圍第1項所述的無線傳輸/接收單元(WTRU),其中該測量涉及是否沒有回應該E-DCH頻道配置請求。
  5. 如申請專利範圍第1項所述的無線傳輸/接收單元(WTRU),其中一確認(ACK)信號或是一非確認(NACk)信號至少其中之一是由該WTRU經由該DL EU所接收,以及該ACK信號與該NACK信號至少其中之一的功率是基於該測量而調整。
  6. 如申請專利範圍第5項所述的無線傳輸/接收單元(WTRU),其中用於該NACK信號的傳輸功率是設定為高於該ACK信號的傳輸功率。
  7. 如申請專利範圍第1項所述的無線傳輸/接收單元(WTRU),其中該WTRU的該MAC-e失效是在重新傳輸的一數量超過一預設重新傳輸限制時發生。
  8. 如申請專利範圍第1項所述的無線傳輸/接收單元(WTRU),其中該WTRU的該MAC-e失效是發生在一EU傳輸資料在成功傳輸之前到期時。
  9. 一種控制至少一下鏈(DL)增強上鏈(EU)頻道功率偏差的無線傳輸/接收單元(WTRU),包括:一增強專用頻道(E-DCH)頻道;一上鏈(UL)增強上鏈(EU)頻道;一下鏈(DL)增強上鏈(EU)頻道; 其中該WTRU經由一傳輸器以經由該E-DCH頻道或該UL EU頻道其中之一發送一E-DCH配置請求;其中,回應於該E-DCH配置請求,該WTRU針對經由該WTRU的天線接收的頻道配置資訊來監控DL EU;其中,在關於該UL EU頻道的一測量符合一預設閾值的情況下,調整該DL EU的傳輸功率偏差,其中該測量是藉由從針對該WTRU的一無線鏈結控制(RLC)復原請求數量減去該WTRU所偵測的該WTRU的一EU媒體存取控制(MAC-e)失效數量來決定。
TW98101110A 2004-04-30 2005-04-27 控制下鏈增強上鏈頻道功率偏差的裝置 TWI406516B (zh)

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US8213980B2 (en) 2012-07-03
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