TWI373933B - Method of performing uplink synchronization in wireless communication system - Google Patents

Method of performing uplink synchronization in wireless communication system Download PDF

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TWI373933B
TWI373933B TW097122728A TW97122728A TWI373933B TW I373933 B TWI373933 B TW I373933B TW 097122728 A TW097122728 A TW 097122728A TW 97122728 A TW97122728 A TW 97122728A TW I373933 B TWI373933 B TW I373933B
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random access
timer
competition
contention resolution
message
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TW200908592A (en
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Sung Jun Park
Young Dae Lee
Seung June Yi
Sung Duck Chun
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Lg Electronics Inc
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/24Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662Arrangements for Wireless System Synchronisation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/0005Synchronisation arrangements synchronizing of arrival of multiple uplinks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/24Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2662Arrangements for Wireless System Synchronisation
    • H04B7/2668Arrangements for Wireless Code-Division Multiple Access [CDMA] System Synchronisation
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/001Synchronization between nodes
    • H04W56/0015Synchronization between nodes one node acting as a reference for the others
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/004Synchronisation arrangements compensating for timing error of reception due to propagation delay
    • H04W56/0045Synchronisation arrangements compensating for timing error of reception due to propagation delay compensating for timing error by altering transmission time
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/002Transmission of channel access control information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/08Non-scheduled access, e.g. ALOHA
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/08Non-scheduled access, e.g. ALOHA
    • H04W74/0833Random access procedures, e.g. with 4-step access

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Telephone Function (AREA)

Description

1373933 九、發明說明: 【發明所屬之技術領域】 本發明係關於無線通信,且更具體而言,係關於一種 在無線通信系統中執行上行鏈結同步化之方法。 【先前技術】
基於寬頻帶分冯多重存取(wideband code division multiple access, WCDMA)無線電存取技術之第三代夥伴 工程(3 GPP)行動通信系統係在全世界受到廣泛推廣。高速 下行鍵結封包存取(High-speed downlink packet access, HSDPA)(可定義為WCDMA之第一發展階段)可為3GPP提 供在中期遠景中具有強競爭力的無線電存取技術。然而, 由於使用者以及服務提供商的需求及期望持續增加,且競 爭的無線電存取技術之開發一直在進行中,.故在3 GPP中 需要有新的技術進步來鞏固其在將來的競爭力。需求包括 降低每位元費用、增強服務可用性、靈活使用頻寬、結構 簡單且介面開放、使用者設備(user equipment, UE)具有恰 當功耗及諸如此類》 一般而5 ,在一基地台(base stati〇n,Bs)之覆蓋範圍 内存在一或多個小區(cell)。一小區可包括複數個UE。uE 通常在隨機存取程序的控制下存取網路eUE執行隨機存取 程序以達以下目的:(1)初始存取;(2)交遞(hand〇ver) ; (3) 排程請求,及(4)計時同步化β然而,此僅為例示目的因 而執行此隨機存取程序之目的之内容或數目可端視系統而 變化。 5 1373933 該隨機存取程序可劃分成競爭式隨機存取程序及非競 爭式隨機存取程序。兩種隨機存取程序之間的主要區別在 於是否將隨機存取前文(random access preamble)專門指派 給一 UE。在該非競爭式的存取程序中,由於UE僅使用專 門指派給該UE的隨機存取前文,故不會發生與另一 UE 之競爭(或衝突)。當兩個或更多個UE藉由使用同一隨機 存取前文經由相同資源試圖使用該隨機存取程序時,則會 發生競爭。在競爭式隨機存取程序中,由於該等UE所用 隨機存取前文係隨機選擇的,故存在競爭可能性。 在基於正交分頻多工(orthogonal frequency division mnUiplexing,OFDM)之無線通信系統中,UE與BS之間的 計時同步化很重要,其有助於最小化使用者之間的干擾。 隨機存取程序係為上行鏈結同步化而執行。當執行隨機存 取程序時,根據自BS傳送之時間校準值對UE實施時間同 步化。當上行鏈結同步化達成時,UE係運行一時間校準計 時器。若時間校準計時器處於運行狀態,則被認為UE與 B S相互間實現了上行鏈結同步化。若時間校準計時器逾時 或未處於運行狀態,則被認為UE與BS相互間未實現同步 化。在此情況下,除非傳輸隨機存取前文,否則上行鏈結 傳輸無法達成β 在競爭式隨機存取程序中,由於總存在競爭之可能 & ’故可能發生隨機存取失敗。因此,目前需要一種由隨 機存取失敗引起的執行上行鏈結同步化之方法。 【發明内容】 6 1373933 技術問顆 本發明提供一種在無線通信系统中執行競爭式隨機存 取程序時執行上行鏈結同步化之方法。 本發明亦提供一種在無線通信系统中避免由於不正確 的上行鏈结同步化而對其他使用者設備造成干擾的方法。 技術方案 在一態樣中,提供一種在無線通信系統中執行上行鏈 結同步化之方法。該方法包括:傳送隨機選自一組隨機存 取前文的隨機存取前文;接收隨機存取回應’該隨機存取 回應包括與該隨機存取前文相對應的隨機存取前文識別瑪 及用於上行鏈結同步化之時間校準值;使用該時間校準值 後啟動時間校準計時器;當接收到該隨機存取回應後啟動 競爭解決計時器’其中當該競爭解決計時器逾時之時競爭 解決不成功,及當該競爭解決計時器.逾時之時關停該時間 校準計時器。 該方法邛更包括:傳送經排程訊息’該經排程訊息包 括唯一識別瑀;及在接收到競爭解決訊息時,關停競爭解 決計時器,該競爭解決訊息包括與該唯一識別碼相對應的 識別碼。當傳送該經排程訊息時’可啟動競爭解決計時器。 在另一態樣中,提供一種在無線通信系統中執行上行 鏈結同步化之方法。該方法包括:傳送隨機選自一組隨機 存取前文之随機存取前文;接收隨機存取回應,該隨機存 取回應包括與该隨機存取前文相對應的隨機存取前文識別 碼;當接收隨機存取回應後啟動時間校準計時器;及當競 1373933 爭解決未成功時關停該時間校準計時器D 優點 即使競爭解決未成功亦可避免不正確的上行鏈結同步 化。因此,可減輕對其他使用者設備的干擾,並可防止由 不正確的上行鏈结同步化所引起的服務延遲。 【實施方式】
第1圖顯示一種無線通信系統之結構。該無線通信系 统可具有一演進的通用行動通信系統(evolved-universal mobile telecommunications system, E-UMTS)之網路結 構。該 E-UMTS 可稱為長期演進(long-term evolution,LTE) 鼻统。無線通信系統可廣泛用於提供多種通信服務,例如 語音、封包資料等。 參照第1圖,演進的 UMTS地面無線電存取網路 (evol ved-UMTS terrestrial radio access network, E-UTRAN)包括至少一個基地台(BS) 20,用來提供一控制 平面及一使用者平面。
使用者設備(UE) 10可係固定的或行動的,且可稱為 另一術語,.例如行動台(mobile station,MS)'使用者終端 (user terminal,UT)、用戶台(subscriber station, SS)、無 線裝置等。BS 20通常係可與UE 10通信的固定台,且可 稱為另一術語,例如演進的節點一B (evolved n〇de-B, eNB)、基地收發器系統(base transceiver system, BTS)、存 取點等。在BS 20的覆蓋範圍内存在一或多個小區(ce丨丨)。 在該等BS 20之間可使用傳遞使用者通信或控制通信之介 8 1373933 面。因此,下行鏈結係被界定為自BS2〇至UE 10的通信 鏈結’上行鏈结則被界定為自UE 10至BS 20之通信鏈结。
BS 20係藉助X2介面來相互連接。BS 20亦藉助S1 介面來連接至演進的封包核心(ev〇lved packet core, EPC),更具體而言,來連接至行動性管理實想/飼服閘道 (mobility management entity/serving gateway, MME/S-GW) 30。SI介面係支援BS 20與MME/S-GW 30之間的多對多 關係。 第2圖係顯示E-UTRAN與EPC之間功能性劃分的圖 表。 參照第2圖,斜線方塊係指示無線電協定層,而白色 方塊係指示控制平面的功能性實體。
BS執行以下功能:(1)起到無線電資源管理作用(radi〇 resource.management,RRM),例如無線電承載控制、無線 電許可控制、連接行動性控制、及針對UE之資源動態指 派;(2)使用者資料流之網際網路協定(Intern.et protocol, IP) 標頭壓縮及加密;(3)將使用者平面資料路由至S-GW; (4) 傳呼訊息之排程及傳送:(5)廣播資訊之排程及傳送;及(6) 針對行動性的量測及量測報告组態及排程。 MME執行以下功能:(1)將傳呼訊息分發給BS ; (2) 安全性控制;(3)閒置狀態之行動性控制;(4)系統架構演 進(system architecture evolution,SAE)承載控制;及(5) 非存取層(non-access stratum,NAS)發訊之加密及完整性 1373933 S-GW執行以下功能:(1)用於傳呼之使用者平面封包 之终止;及(2)用於行動性支援之使用者平面轉換。 第3圖係顯示UE之結構元件的方塊圊。UE 50包括 處理器51、記憶體52、射頻(radio frequency,RF)單元53、
顯示單元54、及使用者介面單元55。無線電介面協定層係 構建於處理器51中。處理器51係提供控制平面及使用者 平面。每層之功能皆可於處理器51中實現。記憶體52與 處理器51連結,並储存作業系統、應用程式、及通用檔案》 顯示單元54顯示UE 50之多種資訊,並可使用諸如液晶 顯示器(LCD)、有機發光二極體(OLED)等習知元件。使用 者介面單元55可配置有一組習知使用者介面,例如小鍵 盤、觸控式螢幕等。RF單元53與處理器51連結,並傳送 及/或接收無線電信號。
基於在通信系統中習知的開放式系統互連(open system interconnection,OSI)模型之較低三層,可將介於 UE與網路之間的無線電介面協定層劃分成 L1層(第一 層)、L2層(第二層)、及L3層(第三層)。實體層(或簡 記為PHY層)屬於第一層,並經由實體通道來提供資訊傳 遞服務。無線電資源控制(radio resource control,RRC)層 屬於第三層,並起到控制UE與網路間之無線電資源的作 用。UE與網路係經由RRC層交換RRC訊息〇 第4圖係顯示使用者平面之無線電協定架構圖表,第 5圖則顯示控制平面之無線電協定架構圖表;該等係闞明 介於UE與E-UTRAN之間的無線電介面協定之架構。使用 10 1373933 者平面係用於使用者資料傳送之協定堆疊。控制平面係用 於控制信號傳送之協定堆疊。
參照第4圖及第5圖,PHY層屬於第一層,並經由實 體通道來為上層提供資訊傳遞服務。PHY層係經由一傳輸 通道來與媒趙存取控制(medium access cohtrol,MAC)層 (即PHY層之上層)連結。資料係經由傳輸通道在MAC 層與PHY層之間傳遞。在不同的ΡΗγ層(即傳送器之PHY 層與接收器之PHY層)之間,資料係經由實體通道傳遞。 PHY層可藉由正交分頻多工(〇FDM)來進行調變。時間及/ 或頻率可被用作無線電資源。
MAC層屬於第二層,可經由邏輯通道來為無線電鏈結 控制(radio link control,RLC)層(即MAC層之上層)提供 服務。第二層中的RLC層係支援可靠的資料傳遞。根據資 料傳遞方法,在RLC層中存在三種作業模式,即為透明模 式(transparent mode, TM)、不確認模式(unacknowledged mode, UM)及、確認模式(acknowledged mode, AM)° AM RLC係提供雙向的資料傳送服務,並在RLC協定資料單元 (protocol data unit,PDU)之傳遞失敗時支援重新傳送》 封包資料收斂協定(packet data convergence protocol, PDCP)層係屬於第二層,並執行標頭壓缩功能。當傳送諸 如IPv4封包或IPv6封包之IP封包時,IP封包之標頭可包 含相對較大且非必需的控制資訊。PDCP層係減小ip封包 之標頭大小,以便高效地傳送IP封包。 無線電資源控制(RRC)層係屬於第三層,並僅界定於 11 1373933 控制平面中e RRC層係與配置、重新配置、及釋放無線電 承載(radio bearer, RB)相结合以控制邏輯通道、透明通 道、及實體通道。RB係為一在UE與E-UTRAN間傳送資 料的服務,由第二層所提供。當在UE之RRC層與網路之 RRC層之間建立起RRC連接時,稱為UE處於RRC連接 模式。當還未建立起RRC連接時’稱為UE處於RRC間置 模式。
非存取層(non-access stratum,NAS)之層係屬於 RRC 層之上層,並起到執行對話管理及行動性管理的作用。
下行鏈結傳輸通道係一自網路向 UE傳送資料之通 道。下行鏈結傳輸通道之實例包括用於傳送系統資訊之廣 播通道(broadcast channel, BCH)及用於傳送使用者通信或 控制訊息之下行鏈結共用通道(downlink-shared channel, DL-SCH)。下行鏈結多播(或廣播)服務之使用者通信或 控制訊息可在 DL-SCH或下行鏈結之多播通道(multicast channel, MCH)上傳送。上行鏈結傳輸通道係一自UE向網 路傳送資料之通道。上行鏈結傳輸通道之實例包括用於傳 送初始控制訊息之隨機存取通道(random access channel, RACH)及傳送使用者通信或控制訊息之上行鏈結共用的通 道(uplink-shared channel,UL-SCH)。 下行鏈結實體通道係對映至下行鏈結傳輸通道。下行 鏈結實體通道之實例包括用於傳送BCH訊息之實體廣播 通道(physical broadcast channel, PBCH)、用於傳送 MCH 訊息之實避多播通道(physical multicast channel,
ί SI 12 1373933
PMCH)、用於傳送PCH及DL-SCH訊息之實體下行鏈結共 用的通道(physical downlink shared channel,PDSCH)、及 用於傳送諸如下行鏈結或上行鏈结排程授權(其自第一層 及第二層提供)等控制資訊之實逋下行鏈結控制通道 (physical downlink control channel,PDCCH)。PDCCH 係稱 為下行鏈結LI/L2控制通道。上行鏈結實體通道係對映至 上行鏈結傳輸通道。上行鏈結實體通道之實例包括:實體 上行鏈結共用通道(physical uplink shared channel, PUSCH)、實體隨機存取通道(physical random access channel, PRACH)、以及實體上行鏈結控制通道(physical -uplink control channel, PUCCH)。PUSCH 係用於傳送 UL-SCH訊息:PRACH係用於傳送RACH訊息:PUCCH係 用於傳送諸如混合自動重複請求(hybrid automatic repeat request,HARQ)確認(acknowledgement,ACK)/ 非確認 (non-acknowledgement,NACK)信號、排程請求信號、及通 道品質指示符(channel quality indicator,CQI)(其自第一 層及第二層提供)等控制訊息。 現在對隨機存取程序進行闡述。日丑在執行諸如以下操 作之過程中執行隨機存取程序:(丨)初始存取,(2)交遞,(3) 將下行鏈結資料傳送至非同步的ϋΕ,(4)由非同步的UE 傳送上行鍵結資料及(5)無線電鏈結失敗之恢復。 第6圖係顯示隨機存取程序之流程圊。 參照第6圖’在步驟si 1〇中,UE藉由使用自BS接 收的系統資訊經由選定的隨機存取資源將隨機存取前文傳 13 1373933 送至Bs。系统資訊包括位於一組可用隨機存取前文之資 訊*UE傳送的隨機存取前文係選自該組隨機存取前文。
在步驟S120中,bs係經由DL-SCH來傳送隨機存取 回應。該隨機存取回應包括時間校準值(用於UE上行鏈結 同步化)、上行鏈結無線電資源指派資訊、隨機存取前文的 索引(被接收以識別用來執行該隨機存取程序之UE)、及 UE臨時識別碼(例如臨時的小區一無線電網路臨時標識 (cell-radio network temporary identity, C-RNTI))» 在步驟S130中,UE係使用時間校準值,並藉由使用 該上行鏈結無線電資源指派資訊來將經排程訊息(包括U E 之难一識別竭)傳送至BS-UE之唯一識別瑪可為C-RNTI、 SAE 臨時行動台識別碼(SAE temporary mobile station identifier, S-TMSI)、或上層識別碼。該唯一識別碼由於係 用於競爭解決,所以亦稱為競爭解決識別碼》 在步驟S140中,當接收經排程訊息後,BS向UE傳 遞包括UE唯一識別碼之競爭解決訊息。 由於可用隨機存取前文的數目有限,在隨機存取程序 中會發生競爭。由於不可能指派該等唯一隨機存取前文給 小區内的全部UE,UE係自該组可用隨機存取前文中選定 一隨機存取前文,隨後傳送該選定的隨機存取前文。因此’ 兩或更多個UE可經由相同的隨機存取資源來選擇及傳遞 相同的隨機存取前文。此係發生競爭時的情況。當接收隨 .機存取前文後,BS在不瞭解競爭發生之狀態下,係傳遞隨 機存取前文之隨機存取回應。然而’由於競爭已經發生’ 14 1373933
兩或更多個UE係接收相同的隨機存取回應,並因此根據 該隨機存取回應中所包括之資訊來傳遞經排程訊息。即, 兩或更多個UE係根據該隨機存取回應中所包括之上行鏈 结無線電資源指派資訊,來傳遞不同的經排程訊息。在此 情沉下,BS可能無法接收全部經排程訊息,或可能僅根據 UE之位置或傳送(Tx)功率而成功接收經排程訊息。若BS 成功地接收經排程訊息,則B S係藉由使用U Ε之唯一識別 碼來傳送競爭解決訊息(該唯一識別瑪係包括在該經排程 訊息中)。當接收到UE之唯一識別碼後,UE可瞭解到競 爭解決係成功。競爭解決使UE瞭解到在競爭式隨機存取 «序中之競爭是否成功。
競爭解決係使用競爭解決計時器。競爭解決計時器在 接收隨機存取回應之後啟動。當UE傳送經排程訊息時, 可啟動競爭解決計時器。當競爭解決計時器逾時之時,可 確定競爭解決係不成功,因此執行新的隨機存取程序。當 UE接收包括UE唯一識別碼之競爭解決訊息時,競爭解決 計時器係停止,且UE可確定競爭解決係成功。若UE在執 行隨機存取程序之前已經具有唯一小區識別碼(例如 C-RNTI ),則UE傳送包括UE之小區識別碼的經排程訊 息’並隨後啟動競爭解決計時器。若UE在競爭解決計時 器逾時前接收到由UE之小區識別碼指引的PDCCH,則UE 可確定競爭成功,並隨後準確無誤地完成隨機存取程序。 若UE不具有C-RNTI,則可能將上層識別碼用作唯一識別 竭°當傳送包括上層識別碼的經排程訊息後,UE啟動競爭
15 1373933 解決計時器。若在競爭解決計時器逾時前在dlsch上接 收到包括UE之上層識別碼之婕爭解決訊息,則UE可確定 • ㈣存取程序成功…爭解決訊息係藉由使用由臨時 C·而I尋址的PDCCH進行接收。否則,若直至競爭解決 計時器逾時之時在DL-SCH上仍未接收到上文提及之競爭 解決,則UE可確定競爭不成功。 現在將對上行鏈結同步化之時間校準進行闡述。在基 於OFDM之系統中,UE與BS之間的計時同步化很重要, 其有助於最小化使用者之間的干擾。 隨機存取程序係上行鏈結時間同步化方法之一者。 即,BS經由UE所傳送的隨機存取前文來量測時間校準 值,並經由隨機存取回應將該時間校準值提供給UE。接收 隨機存取回應後,UE係使用時間校準值,並啟動時間校準 °十時器。當時間校準計時器運行時,UE與BS之間的時間 同步化係得以保持β若時間校準計時器發生逾時或者未運 订’則認為UE與BS之間的時間同步化未能保持。若時 • 校準·*+ W間 器發生逾時以及未運行,則uE僅可傳送隨機存 取前文’且任何其他上行鏈結傳送皆不能達成。 當在執行隨機存取程序之過程中發生競爭時,UE 特誤的時間校準值。若在UE傳送隨機存取前文
U g X . < 月1J 興B s進行時間同步化,則因時間校準計時器正々 行而 仕運 可能在上行鏈結中錯誤地傳送隨機存取前文。 首先’在UE與BS之間未達成上行鏈結同步化之狀態 下’ 1;^向BS傳送隨機選定的隨機存取前文,並接收針尉 16 1373933 該隨機存取前文之隨機存取回應。即使發生 磁錄爭 » ^rt 接收隨機存取回應。在此情況下,由於UE n 沾時間 之發生’所以UE將所接收隨機存取回應中 ,ϋΕ '亦 隨後’ 校準值使用在自己身上,並啟動時間校準計時窃自,炎啟 UE向BS傳送包括UE之唯一識別碼之經排程訊〇時uE 動競爭解決計時器〇若直至競爭解決計時器逾時 _ , 仍未接收到由IJE之唯一識別瑪所尋址的姨I解··、’器持 則UE重試隨機存取程序。然而,由於時間校準計 p #鍵•裕 續運行,故當BS傳送下行鏈結資料時UE可傳送 _ 速行之 資料。此乃因UE判定上行鏈結同步化係藉由玉社 j, ,時間校準計時器而被達成(即使是在上行鏈結同步化本 、 叫填 成之情況下)》在傳送期間,不正確的上行鏈結同梦化巧 致對其他使用者之千擾。 第7圖係顯示—褲根據本發明一實施例執行上行鍵結 同步化之方法的流程圖。首先,UE處於時間校準計時器逾 時或未運行之狀態《在此情況下,當UE嘗試初始網路登 入時或當由於無線電連結失敗而再次搜索小區時,則競爭 式的隨機存取程序係啟動。 —參照第7圖,在步驟S21〇中,UE向Bs傳送隨機選 :的隨機存取前文。在步驟S220中,Bs向ue傳送隨機 ^回應,以作為對隨機存取前文的反應。隨機存取回應 碼、::鏈結無線電資源指派資訊、隨機存取前文識別 時間校準值、及臨時C_RNTI。在步 係使用隨機存取回應中所包括的時間校準值,^啟動時間 17 1373933 校準計時器β 在步驟S240中,經由隨機存取回應中所包括的上行 鍵結無線電責源指派資訊,UE向BS傳送包括ue之唯一 識別碼的經排程訊息。在步驟S250中,UE傳送該經排程 訊息’並隨後啟動競爭解決計時器。 在步驟S260中,若直至該競爭解決計時器逾時之時, UE仍未接收到包括UE之唯一識別碼的競爭解決訊息則 UE關停時間校準計時器。在此情況下,UE可確定競爭不 成功,並因此而重試隨機存取程序。 右發生隨機存取失敗,則UE關停先前處於運行狀態 w時叫校準计時器。此乃因先前接收的時間校準值可能係 用於S UE。因此’由於時間校準計時器停止可防止上 行鏈結傳送使用不正確的時間校準值。 圖係顯示種根捸本發明另一實施例執行上行鏈 結同步化之方法的流程圖。 參照第8圖,在舟rt 在步驟S310中,UE向BS傳送隨機選 定的随機存取前文。右斗 任步騍S320中,BS向UE傳送隨機 存取° '以作為對隨機存取前文的反應。該隨機存取回 應包括時間校準值及臨拉^
時C-RNTI。在步驟S330中,UE 係使用該時間校準值, ^ 並啟動時間校準計時器。在步驟 S340中,UE係經由隨拖★
现機存取回應中所包括的上行鏈結無 線電資源指派訊息向A S傳送包括UE之唯一識別碼的經排 程訊息。在步爾8350Φ i &T ’當傳送該經排程訊息後,UE啟 動競爭解決計時器。 18 ^73933 Μ-少郑 ^由臨時C_RNTI尋址之PDCCH所指示Μ爭解m 該鞔爭解決訊息包括競爭解決識別碼。在步驟s37〇中, UE經由該競爭解決識料來確定是否競爭成功。舉例而 :,可對該競爭解決識別瑪與經排程訊息中所包括的識別 竭進行比較。若兩識別碼不等同,則確定競爭不成功。 ❹驟議中,若確定競爭不成功,則叩關停時間 時器。在此情況下,UE可重試隨機存取程序或可向 層報告競爭不成功。 =機存取程序中競爭不成功,則仙關停當前正 時間校準計時器…,可解決如下問題:即使 ,同步化未達成’時間校準計時器卻仍持續運行。 硬體、^揭示實施例利述之方法相關的步料可藉由 功Lr合實施。硬體可藉由經設計以執行上述 可程'化:專用積禮電路(ASIC)、數位信號處理器(請)、 J程式化邏輯装置(PLD)、 處理器、控制器Μ 閘陣列(FPGA)、 炫制益、微處理n、甘 現。軟體可其他電子元件或其纟且合來實 於記憶體單元中並藉由處組實現。可將軟體儲存 可採用熟習執行。5己憶體單元或處理器 :項技術者所習知之多種構件。 由於本發明可以多 神或本質特徵,故應瞭解施而不背離本發明精 -任何r文閣述之詳細 π實施例不 圍中所界定之Α接油 ,而應在隨附申請專利範 、 及範圍内廣義地加以理解β因此,欲 ί S1 19 1373933 將所有屬於申請專利範園之邊界及範圍或此等邊界及範圍 之等效項的改變或修改涵蓋於隨附申請專利範圍内。 【圖式簡單說明】 第1圖顯示無線通信系統之結構。 第 2圓係顯示介於演進的通用地面無線電存取網路 (E-UTRAN)與演進的封包核心(EPC)之間的功能性劃分的 圖表。
第3圖係顯示使用者設備(UE)之結構元件的方塊圖。 第4圖係顯示使用者平面之無線電協定架構之圖表。 第5圖係顯示控制平面之無線電協定架構之圖表。 第6圊係顯示隨機存取程序之流程圖。 第7圖係顯示一種根據本發明一實施例執行上行鏈結 同步化之方法的流程圖。 第8圖係顯示一種根據本發明另一實施例執行上行鏈 結同步化之方法的流程圖。 【主要元件符號說明】
10 使用者設備(UE) 20 基地台(BS) 30 行動性管理實體(MME)/伺服閘道(S-GW) 50 使用者設備 5 1 處理器 5 2 記憶體 53 射頻單元 54 顯示單元 20 1373933 55 使用者介面單元 21

Claims (1)

1373933 十、申請專利範圍: 1. 一種於一無線通信系统中執行上行鏈结同步化之方 法,至少包含: 傳送隨機選自一組隨機存取前文之一隨機存取前文; 接收一隨機存取回應,該隨機存取回應包含與該隨機 存取前文相對應之一隨機存取前文識別碼及用於上行鏈結 同步化之一時間校準值;
使用該時間校準值後啟動一時間校準計時器; 接收該隨機存取回應後啟動一競爭解決計時器,其中 當該競爭解決計時器逾時後,表示競爭解決不成功;及 當該競爭解決計時器逾時後,關停該時間校準計時器》 2.如申請專利範圍第1項所述之方法,更包含: 傳送一經排程訊息,該經排程訊息包含一唯一識別 碼;及
當接收到一競爭解決訊息時關停該競爭解決計時器, 該競爭解決訊息包含與該唯一識別碼相對應的一競爭解決 識別碼》 3. 如申請專利範圍第2項所述之方法,其中當傳送該經排 程訊息時,啟動該競爭解決計時器。 4. 如申請專利範圍第2項所述之方法,其中該隨機存取回 應更包含上行鏈結無線電資源指派,且該經排程訊息係在 22 1373933 該上行鏈結無線電資源指派中傳送 5. —種於一無線通信系统中 法,至少包含: 執行上行鏈結 同步化之 傳送隨機選自一 接收一隨機存取 存取前文相對應之一 板隨機存取前文之— 〈 隨機存取前文 回應,該隨機存取入 取回應包含與該隨 隨機存取前文識別碼
接收該隨機存取回應後,啟動一時間校準計時器 當競爭解決不成功時,關停該時間校準計時器。 6.如申請專利範圍第5項所述之方法,更包含: 處理用於上行鏈結同步化之一時間校準值,其中該 間校準值係經由該隨機存取回應所接收。 7·如申請專利範圍第5項所述之方法,其中當一競爭 計時器逾時之後,該錄爭解決不成功。
8. 如申請專利範圍第7項所述之方法,其中在接收到該 機存取回應後,啟動該競爭解決計時器》 9. 如申請專利範圍第5項所述之方法,更包含: 在接收到該隨機存取回應後,傳送一經排程訊息, 經排程訊息包含一唯~識別瑪。 方 * 機 及 時 決 隨 該 23 1373933
10. 如申請專利範圍第9項所述之方法, 競爭解決訊息時,表示該競爭解決不成 息包含與該唯一識別碼相對應的一競爭 11. 如申請專利範固第10項所述之方法 當傳送該經排程訊息時啟動一競爭 直至該競爭解決計時器逾時後仍未接收 時,表示競爭解決不成功》 12.如申請專利範圍第10項所述之方法 當傳送該經排程訊息時啟動一競爭 在該競爭解決計時器逾時之前,當該競 該唯一識別碼不匹配的該競爭解決識別 決不成功,其中該競爭解決訊息係由該 包括的臨時C-RNTI尋址之實體下行鏈I 來表示。 其中當未接收到一 功,該競爭解決訊 择決識別碼。 *更包含·‘ 解決計時器,其中 到該競爭解決訊息 ,更包含: 解決計時器,其中 爭解決訊息包括與 碼時,表示競爭解 隨機存取回應中所 i控制通道(PDCCH)
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