TW201541901A - 許魷伺服無線網路控制器控制b節點清除之系統 - Google Patents
許魷伺服無線網路控制器控制b節點清除之系統 Download PDFInfo
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Abstract
一種允許RNC控制在B節點緩衝的資料的清除之系統及方法。RNC監控起始清除過程的觸發事件,RNC接著藉由傳送清除指令以通知B節點需要清除資料,其促使該B節點刪除至少部份已緩衝之資料。依據在該RNC實施的特定資料清除觸發事件,清除指令可包括用於B節點清除特定UE的所有資料、在一或許多使用者優先順序傳輸佇列中或在B節點的邏輯頻道中的資料的指示。
Description
本發明與無線電通訊領域有關,更特定言之,本發明與提供伺服無線電網路控制器的允許B節點之清除控制之系統及方法有關。
第三代(3G)通用地面無線電存取網路(UTRAN)包括許多無線電網路控制器(RNC),每一個無線電網路控制器耦合至一或更多B節點,每一個B節點包括一或更多服務一或更多胞元的基地台,該B節點必然與一或更多使用者設備(UE)通訊。
包括分頻雙工(FDD)及分時雙工(TDD)模式的3G系統典型上使用RNC來分佈(亦即,緩衝及排程)至UE的資料傳輸。然而,對3G蜂巢系統的高速頻道,資料是由B節點分佈。例如,這些高速頻道的其中一個為高速下鏈分享頻道(HS-DSCH)。因資料由B節點分佈,在傳輸至UE前,需先緩衝在B節點的資料。
有許多在B節點緩衝的資料不再有用的案例,且其存在會阻礙系統的有效操作。例如,第一個案例為當可移動UE自一個胞元移動至另一個。此會導致HS-DSCH胞元變化(由此該UE由另一個B節點服務),或者在相同B節點的胞元間切換。"舊的資料"(亦即,在HS-DSCH胞元變化前在B節點內緩衝準備傳輸至UE的資料)在HS-DSCH胞元變化後不再是有用的,若B節點持續緩衝及傳送此資料,其浪費緩衝資源及無線電鏈路資源。希望能自該緩衝清除此舊資料及停止此資料的傳輸,因此作法節省緩衝資
源及無線電鏈路資源。
第二個案例與無線電鏈路控制器(RLC)層有關。RLC層在伺服無線電網路控制器(SRNC)及UE皆為對等實體,有時存在當RLC點對點協定失效,且RLC重新設定其本身的機會。RLC失效的原因為因情況而異的且此種原因不在本發明範圍內。然而,一旦RLC重新設定其本身,由於RLC重新同步及重新開始傳輸,先前在B節點緩衝的資料不再為有用的。此已緩衝的資料僅會引起傳輸延遲及不必要的無線電資源之使用,若被傳輸,此資料只會由RLC對等實體捨棄。
第三個案例與藉由RLC在確認模式(AM)的資料之依序傳送有關。該AM RLC的要求為確認通訊協定資料單元(PDU)的依序傳送發生。RLC使用與每一個PDU關聯的序號(SN)以確認PDU的依序傳送至較高層。當有失序傳送(亦即,當找不到PDU時)時,在UE的RLC傳送狀態報告PDU至其在B節點的對等實體,要求重新傳輸該遺漏的PDU,一旦接到狀態報告PDU,在RNC的對等實體重新傳輸該遺漏的PDU之複本。
基於許多理由,高度希望已重新傳輸的PDU儘可能快速到達接收側(亦即,該UE)的RLC。首先,因依序傳送的要求,遺漏的PDU會防止後續的PDU向前送至較高層,第二,UE的緩衝尺寸需足夠大以容納重新傳輸的延遲,並仍維持有效的資料速率,延遲愈長,UE的緩衝尺寸必須愈大以容許UE緩衝停滯的PDU及持續的資料接收,直到正確的序列PDU可被向前送至較高層。較大的緩衝尺寸造成UE的增加硬體成本。這是非常不期望的。
第1圖為包括RNC、B節點、UE及其相關聯的緩衝器的習知系統。在此習知系統,具有SN=3的PDU未被UE成功接收。因此,UE中的RLC要求在RNC的其對等RLC層重新傳輸。同時,具有SN=6-9的PDU在B節點被緩衝,且具有SN=4及5的PDU在UE被緩衝。應注意的是雖然第1圖僅顯示被緩衝的數個PDU,事實上更多PDU(例如100或更多)及來自其他RLC
對等的PDU可被緩衝。
如第2圖所示,具有SN=3的PDU的重新傳輸必須在B節點緩衝的佇列末端等待,且僅在具有SN=6-9的PDU被傳輸後才被傳輸。直到所有PDU依序被接收為止,在UE中的PDU無法向前送至較高層。在此情況下,具有SN=3的PDU停止後續的PDU向前送至較高層(亦即,SN=4-9),假設所有PDU被成功傳輸。注意此實例僅反映10個PDU,但是在正常操作中數百個PDU可在重新傳輸的資料PDU之前被排程,其更使傳輸的延遲及資料緩衝議題惡化。
上述案例儘為許多實例的少數,其中清除B節點中的資料將使無線電通訊系統更有效率操作。
希望有一種系統及方法,藉此RNC可控制在B節點緩衝的不再有用的資料之清除。在許多情況下,此緩衝資料的刪除會使系統更有效操作。
本發明包括一種允許RNC控制在B節點緩衝的資料的清除之系統及方法。清除指令刪除與特定UE關聯的B節點緩衝資料。基於在RNC實施的特定資料清除觸發事件,RNC確定清除特定UE的所有資料、在一或許多使用者優先順序傳輸佇列中或在B節點的一或更多邏輯頻道中的資料,RNC接著通知B節點需要清除傳輸資料,清除指令可包括B節點在接收到從RNC起始的現有(習知)程序時清除資料的配置、可包括特定地要求B節點的資料清除的全新程序、或是可存在於現有程序內或是作為表明B節點清除要求的位元或資訊元素的資料傳輸訊框中。
10、50、70、100‧‧‧方法
12-20、52-62、112-120、122、124‧‧‧步驟
第1圖為RNC的先前技藝重新傳輸。
第2圖為無清除的先前技藝RLC重新傳輸。
第3A圖為根據本發明產生清除訊息的方法。
第3B圖為根據本發明包括確認的產生清除訊息的替代方法。
第4圖為根據本發明方法的B節點的清除之實例,RNC等待直到PDU清除狀態已被接收才重新傳輸。
第5圖為根據本發明方法具有清除的RLC重新傳輸。
第6圖為根據本發明方法的B節點的清除之實例,RNC不等待直到PDU清除狀態已被接收即重新傳輸。
本發明較佳具體實施例參考圖式來敘述,其中相同數字表示相同元件。
參考第3A圖,顯示根據本發明的RNC控制在B節點內的清除功能之方法10。RNC等待與特定UE關聯的清除"觸發"事件(步驟12)的發生,此觸發事件例如可包括伺服HS-DSCH胞元變化、RLC重新設定或從UE產生RLC狀態報告以要求重新傳輸某些PDU。雖然這些為觸發事件的三個實例,本領域中具有通常知識者應清楚地瞭解,若B節點的清除可產生對系統操作的利益,任何功能可被用做觸發事件以清除B節點。因此,此後敘述的本發明方法及系統應不被限制在僅所列舉的三個觸發事件。
依清除觸發事件而定,與UE關聯的所有資料、與UE關聯的特定資料流的資料、或與UE關聯的一或更多邏輯頻道的資料可被要求以用於在B節點的清除。
例如,在伺服HS-DSCH胞元變化的情況下,在伺服HS-DSCH胞元變化後,在來源B節點緩衝的所有UE資料不再為有用的。RNC清除來源B節點以釋出所有緩衝器中與UE關聯的所有資料,使得沒有任何無線電資源浪費在不必要的資料傳輸上。
在RLC重新設定或RLC重新傳輸的情況下,RNC可藉由傳輸優先順序佇列、或者與RLC實例關聯的邏輯頻道來為特定UE選擇性地清除在B節點緩衝的資料。在RLC重新傳輸的情況下,清除功能會降低RLC重新傳輸的延遲,且在RLC重新設定的情況下,清除功能會避免無線電資源的浪費。
再一次參考第3A圖,RNC確定是否已接收到觸發事件(步驟14),若未接收,則RNC回到步驟12並持續等待觸發事件的發生。若已偵測到觸發事件,則RNC傳送清除訊息至B節點,清除訊息顯示B節點應清除與UE關聯的所欲資料(步驟16),此可為在與一或更多資料流關聯的一或更多緩衝中的資料。在B節點接收該訊息後(步驟18),其清除所欲緩衝(步驟20)。
根據本發明的方法10,應瞭解在B節點內資料的清除刪除了不再是有用的資料及釋放在B節點的資料緩衝資源及不必要被分配用於傳輸此資料的無線電資源。
本領域中具有通常知識者也應了解由步驟16顯示的清除訊息可包括任何一或更多下列替代方式。在清除訊息的第一替代方式中,在現有UTRAN程序內的清除訊息在RNC及B節點間發出訊息,因此B節點被配置為由B節點接收的訊息起始清除。在此替代方式中,在現有程序中的資料清除為隱含的且僅僅是訊息接收,沒有任何額外的傳訊,造成即使是該訊息是與完全不同的功能有關的資料清除。此隱含關聯可以訊框協定資料訊框發生、可在RLC PDU攜帶、或是可以先前技藝訊息的資訊元素或B節點應用部份(NBAP)或無線電網路子系統應用部份(NASAP)的程序被攜帶而發生。
在清除訊息的第二替代方式中,清除訊息可包括在RNC及B節點間傳訊的完全新的或唯一的UTRAN程序,其明確地指示B節點開始所欲緩衝的清除。此包括完全專用於該除功能的單獨訊息。在此替代方式中,
例如,在訊框協定的新控制訊框是專用於清除功能或是新的NBAP程序或是新RNSAP程序是專用於清除功能。
清除訊息的第三替代方式中,清除訊息可包括一部份現有UTRAN程序。在此具體實施例中,於在RNC及B節點間傳訊的現有UTRAN程序的一部份訊息之位元或資訊元素是專用於清除功能。B節點經由現有程序接收此訊息及讀取位元或資訊元素以確定清除是否應發生。
最後,清除訊息的第四替代方式中,B節點被預先配置為當從RNC接收訊息(其可為習知訊息或新訊息)時可清除資料。在此替代方式中,例如,B節點被預先配置為當接收到表明HS-DSCH頻道的釋出(亦即,無線電鏈路的釋出)之訊息時可清除資料。清除功能為有益的,因與HS-DSCH頻道及在B節點緩衝的資料於HS-DSCH頻道的釋出後不再為有用的。
本領域中具有通常知識者亦應瞭解,依據特定情況,因適當系統操作的原因,其他功能可能遵循在該B節點的清除功能之性能。對不同案例,本發明不阻止由在B節點的經RNC控制的清除功能與其他功能之統合。
如第3B圖所示,B節點可額外確認清除功能。步驟112-120與參考第3A圖方法10所示及敘述的步驟12-20相同。因此,這些步驟不再進一步敘述。然而,根據本發明方法100的此替代方法,在B節點清除所欲緩衝後(步驟120),其送出資料已被清除之確認至RNC(步驟122),RNC接著接收並處理此確認(步驟124)。
確認的形式及該RNC回應此採取的動作會基於適合不同情況的不同系統結構而不同。做為實例,在清除功能被設計用於RLC PDU重新傳輸時的HSDPA中,完成清除功能後從B節點至RNC的確認可被實施用於RNC以重新開始PDU傳輸。在此情況下,確認可以如先前所提及的類似方法進行。
在確認訊息的第一替代方式中,確認訊息在由B節點至RNC的現有訊息內如訊框協定資料訊框的標頭、或NBAP或RASAP的習知訊息的一或許多位元或資訊元素。
在確認訊息的第二替代方式中,確認訊息可包括全新的或唯一的訊息。此包括完全專用於清除功能的確認的單獨訊息,例如,在專用於清除確認功能的訊框協定的新控制訊框、或是專用於清除確認功能的NBAP或是RNSAP的新訊息。
最後,確認訊息的第三替代方式中,從B節點至RNC的現有訊息被預先配置為表明清除功能的確認,即使在訊息中沒有任何特定保留用於確認的訊框。本領域中具有通常知識者應瞭解,依據特定情況,可使用其他可達到適當系統操作的方法以確認清除功能。
無論確認形式為何,應注意確認可包括許多功能,首先,其可包括B節點確認完成清除功能。或者,其可提供在B節點的PDU傳輸之狀態以輔助RNC操作。由於B節點不知道PDU的SN,因此B節點無法直接傳送經傳輸的PDU的SN回到RNC,B節點會以如識別在B節點的PDU狀態之點陣圖來通知RNC關於PDU的傳輸狀態,該狀態可顯示已被清除及正等待傳輸的PDU、或PDU的數目。
參考第4圖,本發明方法50的一個實例被示出,在此情況中,UE傳輸表明一或更多PDU遺漏的狀態PDU。在步驟52,UE傳輸表明PDU狀態的RLC狀態報告至RNC。在此實例中,假設狀態報告表明一或更多PDU為遺漏的,在處理該狀態報告後,RNC送出訊息至B節點以從與要被重新傳輸的PDU關聯的緩衝中清除已緩衝的PDU(步驟54)。
清除訊息可經由在具有已重新傳輸的PDU的資料訊框中、或是以較已重新傳輸的PDU為高的優先順序傳送的控制訊框中的訊框協定來攜帶。或者,在NBAP或RNSAP上的訊息亦可被用來通知B節點,B節點從所欲緩衝清除PDU(步驟56)、以及向RNC確認該清除與PDU狀態(步驟58),
接著RNC重新傳輸遺漏的及後續的PDU(步驟60)。B節點將這些PDU轉送至UE(步驟62)。或者,清除訊息可隨在訊框協定的遺漏的PDU而被包括或是可在該NBAP或RNSAP被傳輸、或做為其上的單獨訊息。
在RLC重新傳輸的情況下進行B節點的清除功能的益處為降低傳輸延遲,其說明於下列實例。參考第5圖,使用根據本發明的清除功能,B節點清除緩衝,故具有SN=6-9的PDU被刪除,清除功能完成之後,B節點向RNC確認清除功能,且RNC接著從SN=3(亦即在UE遺漏的PDU)重新開始RLC傳輸,B節點接著接收具有SN=3的PDU,因沒有其他PDU在其前面,具有SN=3的經重新傳輸PDU較第2圖所示案例更為快速地被傳輸。在此實例中,於B節點已被清除後,具有SN=6-9的PDU由傳輸側的RLC再次被重新傳輸。
在傳送遺漏的PDU後,RNC立即以其最佳能力開始重新開始正常的PDU順序,或者其可等待直到確認清除及給出關於已清除PDU資訊的PDU清除狀態從B節點送出。
在第一替代方式中,未執行清除功能的確認,或是即使確認功能被執行,RNC未等待接收B節點清除功能之確認後即開始重新傳輸遺漏的PDU。B節點不僅在接收清除功能前清除已緩衝的PDU且在從RNC接收清除指令後會將最近接收的PDU傳送至UE。
在第二替代方式中,RNC等待,直到清除確認從B節點送出。若該確認亦包含B節點中的資料區塊傳輸狀態,則RNC可使用該資訊以確定於何處重新開始PDU傳輸。
參考第6圖,示出根據本發明的替代方法70。除了無清除資訊確認及無B節點送至RNC的PDU狀態外,此方法70類似於第4圖所示的方法50。
僅管本發明已以較佳具體實施例敘述,在於下文申請專利範圍列出的在本發明範圍內的其他變化為本領域中具有通常知識者明顯易見
的。
52-62‧‧‧步驟
Claims (12)
- 無線電網路控制器(RNC)方法,包括:至少一裝置,被配置為傳送與一高速下鏈分享頻道(HS-DSCH)關聯的一資料訊框至一節點B,其中該資料訊框包括一資訊元素,該資訊元素請求清除在該節點B的一傳輸優先順序佇列中與一使用者設備(UE)關聯的所有封包資料單元(PDU)。
- 如申請專利範圍第1項所述的方法,其中該訊息是回應於該UE的一HS-DSCH胞元變化而被傳輸。
- 如申請專利範圍第1項所述的方法,其中該訊息是回應於一無線電鏈路控制(RLC)重置而被傳輸。
- 如申請專利範圍第1項所述的方法,其中該UE及該節點B以一確認模式(AM)進行通訊,以確保封包資料單元(PDU)的依序遞送。
- 如申請專利範圍第1項所述的方法,其中該資訊元素是請求所述清除的一單一位元。
- 一種節點B,包括:一傳輸優先順序佇列,被配置用於儲存等待傳輸至一使用者設備(UE)的複數個封包資料單元(PDU);至少一裝置,被配置為從一無線電網路控制器(RNC)接收與一高速下鏈分享頻道(HS-DSCH)關聯的一資料訊框,其中該資料訊框包括一資訊元素,該資訊元素請求清除在該傳輸優先順序佇列中與該UE關聯的所有PDU;以及該至少一裝置被配置為從該傳輸優先順序佇列中清除與該UE關聯的所有PDU。
- 如申請專利範圍第6項所述的節點B,其中該訊息是回應於該UE的一 HS-DSCH胞元變化而被接收。
- 如申請專利範圍第6項所述的節點B,其中該訊息是回應於一無線電鏈路控制重置而被接收。
- 如申請專利範圍第6項所述的節點B,其中該UE及該節點B以一確認模式(AM)進行通訊,以確保PDU的依序遞送。
- 如申請專利範圍第6項所述的節點B,其中該資訊元素是請求所述清除的一單一位元。
- 如申請專利範圍第6項所述的節點B,其中該訊息的接收起始該傳輸優先順序佇列中與該UE關聯的所有PDU的清除。
- 如申請專利範圍第6項所述的節點B,其中該收發器更被配置為傳輸一緩衝清除確認至該RNC以確認該傳輸優先順序佇列中與該UE關聯的該些PDU的清除。
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