TW201101752A - Cognitive flow control based on channel quality conditions - Google Patents
Cognitive flow control based on channel quality conditions Download PDFInfo
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- TW201101752A TW201101752A TW99107015A TW99107015A TW201101752A TW 201101752 A TW201101752 A TW 201101752A TW 99107015 A TW99107015 A TW 99107015A TW 99107015 A TW99107015 A TW 99107015A TW 201101752 A TW201101752 A TW 201101752A
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- 230000005540 biological transmission Effects 0.000 claims abstract description 30
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- 238000004891 communication Methods 0.000 description 8
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0205—Traffic management, e.g. flow control or congestion control at the air interface
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/17—Interaction among intermediate nodes, e.g. hop by hop
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/26—Flow control; Congestion control using explicit feedback to the source, e.g. choke packets
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/26—Flow control; Congestion control using explicit feedback to the source, e.g. choke packets
- H04L47/263—Rate modification at the source after receiving feedback
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/10—Flow control; Congestion control
- H04L47/30—Flow control; Congestion control in combination with information about buffer occupancy at either end or at transit nodes
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- 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
- H04L5/0053—Allocation of signalling, i.e. of overhead other than pilot signals
- H04L5/0057—Physical resource allocation for CQI
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0231—Traffic management, e.g. flow control or congestion control based on communication conditions
- H04W28/0236—Traffic management, e.g. flow control or congestion control based on communication conditions radio quality, e.g. interference, losses or delay
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/0247—Traffic management, e.g. flow control or congestion control based on conditions of the access network or the infrastructure network
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H—ELECTRICITY
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- H04W28/10—Flow control between communication endpoints
- H04W28/14—Flow control between communication endpoints using intermediate storage
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- H—ELECTRICITY
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- H04W—WIRELESS COMMUNICATION NETWORKS
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- H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
- H04W8/04—Registration at HLR or HSS [Home Subscriber Server]
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Description
201101752 六、發明說明: 【發明所屬之技術領域】 本發明係_無線電通信的領域’更特定言之’本發明係 關於在第二代(3G)通信系統中於無線電網路控制器(麵^) 及B郎點間資料傳輪流控制之運用。 【先前技術】 一種3G通用地面無線電存取網路(UTRAN)包括許多 RNCs ’每一個RNC伴P遺著-或更多B節點且每一個B節點進一 步伴隨著一或更多胞元。 該3G頻分雙工(FDD)及時分雙工(TDD)模式典型上使 用該RNC以分佈(亦即’緩衝及調度)至至少一個使用者設備 (证)的資料傳輸。然而,對3G蜂窩系統的高速通道,資料被 ,度以進行該B節點的傳輸。例如,這些高速通道的其卜個為 间速下行分旱通道(HS-DSCH)。因資料係由該聯點調度, 必須在該B節點緩衝資料以傳輸至該顶⑻。 又 許多大量在該B節點緩衝的資料對系統的整體操 影響的案例,一些這些案例將敘述於後。 、 第-個案例係關於在3 G系統的重新傳輪機構以達 對端點資料傳輸的高可信度。熟知本技藝者應了解在該b節點及 該UE間的傳輸失敗可能因許多不同的原因。例如,該點 =嘗試傳輸數次絲成功,或者,用於特定傳輸的傳輸時間已 失效。更詳細敘述於後的本發明意欲涵蓋這些情況及資 ^失敗促使無線電連結控繼(RLC)麵傳輸的任何其他^ 重新傳輸機構有許多層次。如-個機構為高速下行分組接 .201101752 入(HSDPA)的混合自動重發請求(H_ARQ)方法之傳輸。該 H-ARQ方法提供一種機構,於此錯誤接收的傳輸被指示給該發 射器,且該發射器重新傳輸該資料直到該資料被正確接收。 除該H-ARQ方法外,在該rnc及該ue有實體。該傳送 實體在特定通信協定資料單位(PDU)的標頭發出序號(SN), 其被接收RLC實體使用以確保沒有任何pDUs在該傳輸失聯,若 在傳輸期間有PDUs失聯(由PDUs的失序傳送而知悉),則該 接收RLC實體傳送一個狀態報告PDU以通知該傳送j^c實體某 〇 些1>01^為失聯的,該狀態報告PDU敘述成功及/或不成功資料傳 輸的狀態,其辨識已失聯或已接收PDUs的序號。若PDUs為失 聯的,則該傳送RLC實體會重新傳輸該已失聯PDU的副本至該 接收RLC實體。 重新傳輸對系統性能的影響參考第1圖被敘述。如所示,當 具SN=3的該PDU未被該UE成功接收時,在該UE内的該要 求在該RNC的其對等實體重新傳輸。同時,具SNs=@7的pDUs 在該B節點的緩衝器排列。 參考第2圖,因重新傳輸方法需要一些時間且資料持續被傳 G 輸’多兩個具SNs=8及9的PDUs已在具SNs=6及7的PDUs之後排 列,且在具SN=3的已重新傳輸pDU前。具SN=3的該PDU必須等 待直到具SNs=6_9的PDUs已被傳輸至該UE。此外,因至較高層 的資料依序傳送之要求,具SNs=4-9的PDUs不會通過較高層直 到具SN=3的該PDU被接收且資料的依序傳送可被進行。 該UE被要求緩衝該失序資料直到失聯的pDU可被傳輸。此 不,造成傳輸的延遲,亦需要該UE具足夠的記憶體能夠進行持 續資料接收的資料緩衝直到已失聯資料可被成功地重新傳輸。 否則,有效的資料傳輸速度被降低,因而影響服務品質。因記 201101752 憶^非f昂貴的’此為不欲的設計_ 例為當需要RLC重新傳輪且在該B節點 == 大的資料傳輸延遲及較高的UE記憶體要求㈣大里祕&成較 第二個案例為當在該B節點資料的緩 能= (L2) ί層3 („U)訊號及資料傳輸由相‘ii: 二的早—緩衝11之情況。雖然=細皮緩衝及進 仃且L2/3减在其後,但峨無法_ 器内的資料量愈大(其以先人先出⑽〇) _=輸= 訊號或資舰渦緩衝n的_愈長。任何紐先順序的L2/3 訊號因在該緩衝器的資料而被延遲。 第三個案例當在該B節點資料的緩衝負面地影響系統性能 ,因舰HS-DSCH胞元變化的情況。因該聯點執行hs_dsch 貧料的調度及緩衝’當該UE執行自來源B節點至目標崎點的飼 服HS-DSCH胞元變化’有—種可能為在交接後相#量的資料仍 在來源B節點被緩衝’此資料為不能回復的因當自來源b節點要 被傳輸至目標B節點在UTRAN結構内沒有資料緩衝的機構。當 伺服HS-DSCH胞元變化時,該就沒有任何關於多少資料(若 有/時)遺失的信息,因該RNC不知何種資料在該來源B節點被 ,衝。在HS-DSCH胞元變化的情況,在該B節點被緩衝的資料 置愈大’最終被滯留在該來源B節點且必須被重新傳輸的資料量 愈大。 、 因此,對上述原因希望限制在該B節點緩衝的資料量。 【發明内容】 本發明為一種藉由聰明地使用在該RNC及在該B節點間的 二貝料流之控制以改善無線通信系統的性能之系統及方法。該系 統監測某些準則且若必須時適當地增加或減少在該RNC及在該 .201101752 B節點間的資料流。此藉由允許重新傳輸的資料、發出訊號步称 及其他要以較先前技藝系統為快的速度成功接收的資料,藉由 減少在該B節點緩衝的資料量來改良傳輸系統的性能。當通道品 質降級時,資料流控制被運用以減少在該B節點的^衝且^ HS-DSCH交接前。 在較佳具體實施例中,本發明於包含與該B節點(具至少一 個緩衝器於其間以儲存資料)通信的無線電網路控制器'() 的無線通信系統實施。該RNC發出訊號給該b節點,且要求該 〇 RNC送出一定量的資料至該B節點。該B節點監測所選擇的品質 指標及基於該所選擇的品質指標計算緩衝器的容量分佈。°該6 節點將容量分佈訊號送至該RNC。為回應該容量分佈的接收, 該RNC以根據該容量分佈所決定的資料流速率傳輸資料至該b Α/ζ «»ι 即點。 【實施方式】 本發明係參考圖式敘述之,其中相同數字表示相同元件。 雖然本發明以參考排列於緩衝器特定數目的pDUs (如數十 PDUs)而被敘述,此提及的PDUs數目僅為簡化用途,根據先 前案例被傳輸及緩衝的PDUs實際數目更可能在數百pDUs或更 多。本發明及其意旨意欲適用於任何數目的pDUs及任何尺寸 輸緩衝器。 一般,當該UE的通道品質降級時,對证本發明減少至該b =點的資料流,且該UE的通道品質改㈣,增加至節點的 資料流。為控制在該RNC及在該B節點間的資料傳輸流,本發 明監測-或更多通道品質的參數’此資料流控制為可基於一個 準則或是許多不同準則的組合。此外,如於下文更詳細說明, 該準則可由該B節點内部地產生,或是可由外部實體產生(如該 7 201101752 UE),並傳送至該b節點。 參考第3A圖,根據本發明監測通信通道品質及調整在該 RNC 52及在該B節點54間的資料流之方法5〇被示出。此方法5〇 處,,該RNC52及在該B節點54間的資料傳輸,該rnck傳輸 谷量要求至該B節點54 (步驟58)。基本上該容量要求為自該 RNC 52至該B節點54的要求使該rnc 52送出一定量的資料至 該B節點54,該B節點54接收此容J;要求及監測所選擇的品質指 標(步驟60)。此所選擇的品質指標可基於自該证傳輸的資料 (於後文詳細說明)’歧可基於内部產生的品 該B節點54緩衝器的深度。 隹 該B節點54亦|£測在該b節點内緩衝器的狀態(步獅2)。 Ϊ可由熟知本技藝者了解’雖然本發明以參考在細節點54内的 敛述以簡化’大部份該緩衝器包括許多緩衝器或是 夕子緩衝器的單一緩衝器,每一個缓衝器或子緩衝器 二二2更ί資料流。無論是否有—或多個多重緩衝器, 使r 緩衝③内:貝料量的指標在該β節點内内部地產生。此 監測在緩衝11 侧龍量,及亦可制該緩衝器 j接文的額外資料量。
52 , 計算並傳輸—種容量分佈(步雜)至該RNC 的次☆該B節點54授權以允許該52送出一定量 J二容量分佈時,該_52根據該分佈傳輸資料 超過該容量分佈。卩而彳=^2|輸資|至脚點54,其量不 該資料康以調整其緩衝器以容納及儲存 傳輸的進碌财㈣料量攸獅該腹 來變化。 _ 82 (示於第_)的送出資料 201101752 熟知本技藝者會欣喜的是tf料流由該腿^ 52至該b節點 54 ’及當該流逮連續由該晚點54調整 50可固定地被重覆。亦應注意方法步驟58、6Q二、6圖4的g 69不必要依序執行,且在方法5()的不同步驟被施用前任何一個 步驟可被施用多次。此外,一些步驟,如容量分佈步驟64,可 顯示重覆,資料分佈使得資料傳輪(步驟⑼〕可被定期地進行。 丄參考第3B圖,根據本發明監測該B節點54及該证幻間的通 仏通道品質之方法80被示出。該B節點54傳輪資料至該证幻 〇 (步驟84)。該证82接收此資料及傳輸一訊號品質指標(步驟 86) ’例如通道品質指標(CQI)至該B節點54。此訊號品質指 標再被用做第3A圖步驟60中的所選擇品質指標。 ^可由熟知本技藝者注意的是方法步驟84及86不必要依序執 行丄例如’在FDD模式’無論是否資料被傳輸,訊號品質指標 為疋期自該UE 82傳送,在此情況下,該顶以可定期地或為回 應特定事件傳輸一訊號品質指標至該B節點54,該訊號品質指標 再被用做第3A圖步驟60中的所選擇品質指標。 如上所述,該所選擇品質指標可由該B節點内部地產生,或 ❹ 者由另一實體(如該证)外部地產生並送至該B節點。根據第 具體實施例,準則為自該UE的通道品質_。在此具體實施 例,為下行通道品質的指標的CQI被使用。 在第二具體實施例,準則為該UE根據該H-ARQ方法所產生 的ACK或NACK。例如’在一段時間,八⑽的數目及/或财阪 的數目可被用來得到通道品質的指標。 在第三具體實施例,準則為該B節點選擇的調變及編碼組 (MCS),其是需要的以成功地傳輸資料。如可由熟知本技藝 者所了解當通道條件為差的時,非常強烈的MCS被使用。或者, 9 201101752 當通道條縣良鱗,較不強烈的⑽被㈣且大 輸。最強烈的MCS組之選擇可被使用做為差的通道品質條 指標’但最不強朗MC_使时徵通道品·件為佳的。 在第四具體實施例,準則為在該Bf‘_輸緩衝n内的 (q職)之深度。例如’若該B節點54缓衝器目前儲存大量 通道品質條件的指標可能是差的,_資料在該 輪緩衝 器被”向後移動”。些微⑽的緩衝器可能通道 的指標且㈣未向後雜。 請仵為良好 在第五具體實施例,賴為"落”在該聯點的資料量。如 落的㈣為該B節點企圖重新傳輪數 人的貝科且在預先決缝目的嘗試後^^被放棄的資料 的傳輸由該B節點掉落,此為通道品質條件為差的指標。 在第六具體實施例,準則為在預先決定時間(例如一 私)=可由該B節點傳輸的資料量。依通信通道的品質而 節點緩衝的PDUs數目可變化。雖然預先決定的時間可被固 ΐ可=3道品f條件,在預先決定時間内可被傳輸的醜s 置了被顯=改變。例如,若通道品件為麵,—百個刚$ =-百亳秒的時間内被傳輸;然而,若通道品f條件非常差, 十個PDUs可在一百秒的時間内被傳輸。 財Ξίί技藝者應了解可直接或間接顯示通道條件的其他準 貝!可根據本發明被·。此外,㈣統使用者的特定需求,二 或更多上述準則的組合可據此被利用或權重。 一 ’射控齡賴c及在卿_的資料流之 :處可被看出。該實例為因失敗傳輸而需 在細祕間的資料流被減少之案例。㈣ 果為僅-個額外具s㈣的PDU在具SN=3的已重新傳輸刚之 .201101752 前排列。如第4圖所示,與第2圖(具SNs=8的PDUs及在具SN=3 的PDU之前排列)所示的先前技藝處理相較,資料流控制之運 用減少具SN=3的PDU之重新傳輸的延遲,因此,具sn=3的PDU 可被早點重新傳輸至該UE。該定序傳送要求產生更快的處理及 PDUs4至8至較高層之傳送。 僅管本發明已以較佳具體實施例敘述,在如下文申請專利 範圍所列出的本發明範圍内的其他變化為熟知本技藝者明顯易 見的。
【圖式簡單說明】 第1圖顯示在該RNC、該B節點、及該UE的資料之先前技藝緩衝。 第2圖顯示在重新傳輸情況下,在該@(:、該B節點、及該ue 的資料之先前技藝緩衝。 第3 A及3B圖共同為根據本發明方法監測通道品質及調整在該 RNC及在該B節點間的資料流。 第4圖為使用第3A及3B圖的方法,在重新傳輸情況下,在該 RNC、該B節點、及該ue的資料之緩衝。 【元件符號說明】
52 RNC 54 B節點 6〇 步驟 64 容量分佈步驟 58、60'62、64、66、69、84及86 方法步驟
82 UE
Claims (1)
- 201101752 七、申请專利範圍: 1. B節點方法,包括: 發器被配置用於與從一無線電網路控制器(J^C)接 收關於該RKC發送—定量¥觀節點的一要求; 一傳輸緩衝器’用於儲存該資料;以及 處理盗’用於監測該傳輪緩衝器的一狀態以及用 於計算 一容量分佈,該容量分佈是依據—選定的品質指示符,藉以, 該處理器贿於概發11接蚊縣_輸縣量分佈,以用 於該RNC傳輸該資料。 如申請專利範圍第〗項所述仙節點,其中該處理器決定該選定 的品質指示符。 3. 如申請專利範圍第2項所述的轉點,其中該選擇的品質指示符 為該傳輸緩衝器的該狀態。 4. 一種B節點,包括: 至少一緩衝器,用於儲存一資料; 用於從一無、線電網路控制器(RNC)接收要求該發适一 定量資料至該B節點的一訊號的裝置; 用於監測一選定的品質指示符的裝置;以及 用以基於親定的品質指柯叫算該緩腳的一容量 12 Ο Ο 7. 201101752 分佈的裝置。 5.如申4專利範圍第4項所述的3節點,更包括: 用於將該容量分佈傳信給該me的裝置; 力用於Μ依照該容量分佈與至少一預定準則決定的一資料 流速而從該RNC接收資料的裝置;以及 、 用於相應調整該緩衝器的裝置。 6.如申4專利範圍第5項所述卿點,其中該選料品質指示符 是以從至少-使用者設備⑽)傳輪麵節點_資料為基礎。 如申請專利範圍第6項所述卿點,其中該職的品質指干符 為一觀品質指標_,該通道品質指標_指出在細及 該Β節點之間建立的一下行通道品質。 8. 如申凊專利範圍第6項所述的Β節點,其中該至少一預定準則是 基於該^依照—混合自動重發請求(H-ARQ)產生的_肯定應 答(ACK)或一否定應答(NACK)。 9. 如申請專利範圍第5項所述卿點,其中該資料流速係增加以 回應該選定的品質指示符的一改善。 10. 如申請專利範圍第5項所述的啤點,其中該資料流速係減少以 回應該選疋的品質指示符的一降級。 η·如申請專利範圍第5項所述_節點,其中該選定的品質指示符 13 201101752 由該B節點於内部產生。 I2·如申請專利範圍第5項所述的B節點’其中該至少一預定準則是 基於由該B節點選擇的一調變及編碼組(Mcs)。 I3,如申請專利範圍第5項所述的B_,其中該至少一預定準則是 基於該緩衝器内的一仔列深度。 、 預定準則是 14·如申請專利範圍第5項所述的B節點,其中該至少一 基於落在該B節點的資料量。 15. 如申請專利範圍第5項所述_節點 一 基於在—财_内可由該B節點傳_龍量Γ 預定準則是14
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