TWI356623B - Preamble retransmission method in mobile communica - Google Patents

Preamble retransmission method in mobile communica Download PDF

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Publication number
TWI356623B
TWI356623B TW096104518A TW96104518A TWI356623B TW I356623 B TWI356623 B TW I356623B TW 096104518 A TW096104518 A TW 096104518A TW 96104518 A TW96104518 A TW 96104518A TW I356623 B TWI356623 B TW I356623B
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Prior art keywords
preamble
transmission channel
response
transmission
channel
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TW096104518A
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TW200742382A (en
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Young-Dae Lee
Sung-Duck Chun
Myung-Cheul Jung
Sung-Jun Park
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Lg Electronics Inc
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/08Non-scheduled access, e.g. ALOHA
    • H04W74/0808Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H04W74/0816Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA] with collision avoidance
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W28/00Network traffic management; Network resource management
    • H04W28/02Traffic management, e.g. flow control or congestion control
    • H04W28/06Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/02Selection of wireless resources by user or terminal
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/23Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • 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
    • H04W74/002Transmission of channel access control information
    • H04W74/006Transmission of channel access control information in the downlink, i.e. towards the terminal
    • 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/08Non-scheduled access, e.g. ALOHA
    • H04W74/0866Non-scheduled access, e.g. ALOHA using a dedicated channel for access
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W72/00Local resource management
    • H04W72/20Control channels or signalling for resource management
    • H04W72/21Control channels or signalling for resource management in the uplink direction of a wireless link, i.e. towards the network
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W74/00Wireless channel access
    • H04W74/02Hybrid access
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Communication Control (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Description

九、發明說明: 【發明所屬之技術領域】 本發明係關於-種進化通用行動電信系統(EUMTS),且 明確言之,係關於在行動通訊系统令重新傳輸一傳送通道 前序喝之方法’用於在一终端及一基地台間更快速上行鍵 路時間同步化。 【先前技術】 第1圖顯示E-UMTS之網路結構,其係關於先前技術及 本發明一者之行動電信系統。該e_Umts係一已從現存WTS 系統進化而來之系統。 第二代合夥專案(3GPP)目前正發展E_UMTS系統之基 本規格。E-UMTS系統可稱為長期進化(LTE)系統。 如第1圖所示’一 E-UMTS網路可由一 e-UTRAN及一核 心網路(CN)組成》E-UTRAN可包括使用者設備(ue)、一稱 為eNodeB或eNB之基地台、及一位於網路末端且連接至外 部網路之存取閘道(AG)。 該AG可分成用於處理使用者流量之一部分及用於處 理控制流量的一部分。用於處理使用者流量之A G部分及用 於處理控制流量之AG部分可經由一用於通訊之新介面彼 此連接》 一或多數胞元(cells)可存在於一 eNodeB(eNB)中,該 eNodeB可藉由一用於傳輸使用者流量或控制流量之介面 連接。 5 1356623 CN亦可包括AG及一用於UE之使用者註冊的節點。亦 可在E-UMTS中提供一介面’以區分e-UTRAN及CN。
介於一行動终端及一網路間之無線電介面協定層,可 依據通訊系統中為人熟知之開放系統互連(〇Si)模型的三 下層,分為一第一層(L11)、一第二層(L2)、及一第三層 (L3)。第一層之一實體層使用一實鱧通道提供資訊轉移。 一位於第三層中之無線電資源控制(RRC)層控制行動终端 及網路間之無線電資源。 RRC層在行動终端與網路間交換rrc訊息。該RRC層 可位於諸如eNodeB及AG之各網路節點中,或位於eNodeB 中或AG中。 第2圖顯示基於3 GPP無線存取網路規格,在一終端及 一 UMTS地面無線電存取網路(UTR AN)間之無線電介面協 定的控制平面之架構。無線電介面協定水平係由一實體 層、一資料鏈路層及一網路層表示,且垂直係由一用於傳
輸資料之使用者平面及一用於傳輸控制訊號之控制平面表 示0 第2圖之該等協定層可依據通訊系統中為人熟知之開 放系統互連(OSI)模型的三下層,分為一第一層(L1)、一第 二層(L2)及一第三層(L3)。現將解釋第2圖所示之控制平面 中的各無線電協定層,及第3圖所示之使用者平面中的各無 線電協定層。 一實體層(其係第一層)使用一實體通道提供資訊.轉移 服務至一上層。該實體層係經由一傳送通道連接至一媒體 6 1356623 存取控制(MAC)層,其位於上層。 資料係在MAC層與實體層間經由一傳送通道轉移。資 料亦在不同實體層間轉移(明確言之,在一傳輸側之實體層 及一接收側之實體層間)。 第二層之MAC層經由一邏輯通道提供服務至無線電 鏈路控制(PLC)層(其係上層)。第二層之rlC層支援可靠資 料傳輸。 應注意RLC層係在虛線中描述,因為若rlC功能係在 MAC層中實施且由其施行,則rlc層本身可能無須存在。 第二層之一封包資料收斂協定(PDCP)層係用以使用 IP封包(例如IPv4或IPv6),以相對較窄頻寬在無線電介面 上有效地傳輸資料。PDCP層施行標頭壓缩以減少含有不必 要控制資訊之相當大IP封包標頭的大小。 一位於第二層最底部處的無線電資源控制(RRC)層係 僅在控制平面中界定。RRC層處理用於無線電載送之組 態重組態及釋放的傳送及實體通道。一無線電載送(RB) 指一由第二層提供用於在行動終端及utran間資料轉移 之服務。 用於將資料自—網路傳輪至一行動终端之下行鏈路傳 送通道,可包括一用於傳輸系統資訊之廣播通道(ΜΗ), 及用於傳輸使用;#流量或控制訊息之下行鍵路共享通道 (随)。下行鏈路多播服務或廣播服務之使用者流量或控 經由下行鍵路s c H ’或經由一額外下行鍵路多播 通道(顧)傳輪。用於將資料自—行料端傳輪至一網路 7 1356623 之上行鏈路傳送通道,可包括用於 战说七仏 得输一初始控制訊息之 隨機存取通道(RACH),及用於傳輪估 使用者流量或控制訊息 的上灯鏈路共享通道(SCH) » 現將詳盡解釋用於一實體層(其伤 、丹係第—層)之正交分頻 多工(OFDM)方法。OFDM之基本原理 ^ ^ λ ^ 係將一具有高傳輸率 (或尚連率)之資料流分成複數具有 率(或低速率)之 資料流,且使用複數載體同時傳輸該複數資料流。 該複數載體係稱為副載體(subcarri打)。存"在於複數載 體間之正交性允許即使元件儀彼此重疊m頻率元件 亦能由一接收端偵測出。 高速率資料流係藉由一串列至並列轉換器轉換成為複 數低速率資料流。一副載體乘以該複數已並列轉換資料 流。該等資料流接著相加且傳輸至接收端。 藉由串列至並列轉換器轉換之複數資料流可使用反轉 離散傅立葉轉換(IDFT)傳輸至複數副載體。IDFT可藉由適 應一反轉快速傅立葉轉換(IFFT)而有效地實施。 OFDM中之低速率副載體的一符號持續時間會增加, 以減少由一基於時間之多路徑延遲曲線產生的相對訊號分 散》在OFDM符號間插入一比一通道之延遲分散更長的保 護間隔,可減少符號間干擾。若一部分OFDM符號被複製 且配置在保護間隔中,則OFDM訊號會循環延伸以致能保 護該符號" 現將解釋一種相關技術正交分頻多存取(OFDMA)。 OFDMA指一種致能藉由將副載逋之一部分提供個別使用 8 1356623 者的多存取方法’其可用於將OFDM調適成一調變方法的 系統。 OFDM A以一稱為副載體之頻率資源提供予一個別使 用者。各頻率資源係獨立提供予許多個別使用者,以致其 彼此不重疊。因此,頻率資源係互斥地分配。
一離散傅立葉變換單一正交分頻多(DFT-S-OFDM)方 法係稱為單一載體分頻多存取FDMA(SC-FDMA)。一相關 技術SC-FDM A方案通常係用於上行鏈路,其中展開係在產 生一 OFDM訊號前,首先於一頻率區處依離散傅立葉變換 (DFT)矩陣之方式應用,且接著該結果係依據一用於傳輸 的相關技術OFDM方法調變〃
第4圖顯示一適應相關技術dFT-S-OFDM方法之傳輪 器的結構》已定義若干變數來解释傳輸器之操作。rNj指 示傳輸一 OFDM訊號之副載體的數目,「Nb」指用於某一使 用者之副载體的數目,「F」指一 DFT矩陣,「s」指一資料 符號向量,「X」.指在頻率區中分散之資料的向量,且「yj 指一在時間區中傳輸的OFDM符號向量。 SC-FDMA在傳輸資料符號「s」前使用DFT矩陣分散資 料符號,如方程式1所示。 [方程式1]
X = FN„xNtS
指一用以分散資料符號「s」之「Nb」大小的DFT 矩陣。副載體映射係藉由調適某一副載體分配方法針對已 分散向量「X」施行。副栽體映射向量「X」係接著藉由IDFT 9 1356623 模组轉換成為時間區, 號,如方程式2所示。 [方程式2] 以獲得一 用於傳輸至接 收蠕之訊
歸指-用來將一頻率區之訊號轉換成 镑之叮间1=£的訊 J大小的DFT矩陣。DFT矩陣之大小 目的控制〇藉由白可将疋 藉由包括一插入之循環前辍A,由該方
之傳輸訊號「y被傳輪。一 一 爾種用於藉由調適以上方式產生 傳輸訊號之方法係稱為8(>1?1)]^八方案。 °第5圖顯 下行鏈路 現將解釋一相關技術混合ARQ(HARQ)方案 不種實施HARQ用於一無線電封包通訊系統之 實體層的方法^ 如第5圓所示’基地台判定一欲接收封包及資訊的终 端,例如一種用於傳輸至終端的封包類型。基地台藉由傳 輸同速不行鏈路控制通道(HS-SCCH)將對應資訊通知該 終端,例如編碼率、調變方法及資料量。
甘 , 一 台接著在一關聯下行鏈路控制通道之時間,經由 同速下行鏈路共享通道(HS-DSCH)傳輸對應資料封包。對 應终端接收該下行鏈路控制通道,識別欲傳輸之封包類型 傳輪時間點,且接收該對應封包。該終端接著嘗試解 碼所接收的封包資料。 若成功解碼封包資料,該終端傳輸一 ACK訊號予基地 台 0 其 *1 ° 台捿收ACK訊號、偵測成功封包傳輸且傳輸次一 封包。 10 1356623 若封包資料未成功解碼,該终端將一 nack訊號傳輸 至基地台。基地台接收NACK訊號及偵測未成功封包傳輸。 基地台可依相同封包類型傳輸相同資料,或在一適當 時間點傳輸一新封包類型。终端使用各種方案以组合該重 新傳輸封包與一先前接收但未解碼之封包,以再次施行解 瑪0
現將解釋一 WCDMA之隨機存取通道(RACH)。RACH 係用來透過上行鏈路傳輸具有短長度之資料的傳送通道。 RACH係用於傳輸若干RRC訊息,例如RRC連接請求訊 息、胞元更新訊息或URA更新訊息。包括CCCH(共用控制 通道)、DCCH(專用控制通道)及DTCH(專用流量通道)之邏 輯通道被映射至RACH。RACH被映射至一實體通道,諸如 PRACH(實體隨機存取通道)。 第6圖顯示典型PRACH之實例。諸如第6圖所示,上行 鏈路實體通道P RACH封包括一前序碼部分及一訊息部分。
前序碼部分施行一功率斜坡功能,用以調整用於訊息 傳輸之適當傳輸功率;及一用於防止在若干終端間訊息碰 撞的功能。訊息部分施行一用於將MAC PDU(協定資料單 元)從一 MAC傳輸至一實體通道的功能。 當终端之MAC層指示一 PRACH傳輸至一終端之一實 體層時,該終端之實體層選擇一存取槽及一簽名,以傳輸 一用於上行鏈路之PRACH前序碼。該前序碼可在一具有 1.3 3毫秒長度之存取槽間隔期間傳輸。該前序碼選擇且傳 輸十六種簽名中之一,達該存取槽之一初始部分的某長度。 11 1356623 一旦該终端傳輪該前序瑪’基地台可經由一下行鍵路 實趙通道AICH(獲取指示符通道)傳輸一回應訊號。基地台 使用一經由AICH傳輸之回應簽名將一綠定回應(Ack)或 否定回應(NACK)傳輪至該终端。 當接收ACK時,該终端傳輸訊息部分。相反地,當接 收NACK時’终端之MAC層在一適當時間後指示一 praCH 重新傳輸至該終端之實體層。若未接收到對應於已傳輸前 序碼的回應,該終端在一指定存取槽後使用比先前前序碼 更高一階之功率傳輸一新前序碼。 已於上文解釋有關RAC Η前序碼之回應。再者,資料 或控制訊號可從基地台傳輸至终端β從基地台傳輸至終端 之控制訊號可包括下行鏈路排程資訊、上行鏈路排程授 與、或從終端至一 RACH前序碼傳輸之回應資訊。 現將解釋藉由基地台傳輸有關RACH前序碼之回應資 訊。當接收一自终端傳輸之RACH前序碼時,基地台可傳 輸回應資訊》 從基地台傳輸之回應資訊可包括時間同步之一調整 值’例如一時間提前(TA)。一 〇Fdm系統應在終端及基地 台間匹配一上行鏈路時間同步。 若時間同步未匹配,終端之一上行鏈路資料傳輸可能 造成干擾另一符號或另一使用者的資料傳輸,從而增加錯 誤率。因此,基地台從终端接收RACH前序碼及計算終端 之TA,以將該TA指示予终端。 終端使用接收的TA重設與基地台之時間同步,以精確 12 1356623 地四配與基地台的時間同步。該终端可使用包括於回應資 訊中之上行鏈路無線電資源分配資訊將資料傳輸至基地 台。 在使用HACH之相關技術方法中,终端將raCH前序碼 傳輸至基地台’且基地台接著將包括用於前序碼之TA'上 行鏈路無線電資源分配資訊’及其他資訊的回應資訊傳輪 炱终端。因此’該终端使用TA來重設與基地台之一時間同 少,以使用上行鏈路無線電資源分配資訊將資料傳輸至基 地台。 然而’一時間效能可能不足以適當地在終端及基地台 間匹配上行鍵路時間同步》例如,一移動快速的終端呈現 難以透過單一 RACH前序碼傳輪及單一 TA回應匹配一精確 時間同步。來自一快速移動終端之資料傳輸可能失敗且可 能造成干擾來自其他終端之傳輸。 【發明内容】 本發明之一目的係提供在行動通訊系統中重新傳輸一 傳送通道前序碼之方法,其係用於在一终端及一基地台間 更快速上行鏈路時間同步。 在本發明之一態樣^,係提供一種用於在行動通訊系 統中排程無線電資源的方法。該方法包括傳輸一傳送通道 别序碼’接收一對於該傳送通道前序碼之傳輪的回應,及 重新傳輪該傳送通道前序碼與使用已分配無線電資源傳輸 資訊令之―,其中若該回應包括一請求重新傳輪該傳送通 13 1356623
道前序碼時,該傳送通道前序碼係重新傳輸,且若該 包括一已分配無線電資源的指示時,資訊係傳輪。 已涵蓋該傳送通道係一隨機存取通道(RACH)。违 涵蓋對該傳送通道前序碼之傳輸的回應係一控制訊號 已涵蓋該傳送通道前序碼係關聯於以下之一:一 連接請求、一胞元更新、遞交、一無線電資源請求及 同步的維持。已進一步涵蓋重新傳輸該傳送通道前序 括使用一包括在該回應卞之簽名。較佳係,重新傳輸 送通道前序碼包括將一重新傳輸指示符包括在該已重 輸前序碼中》 在本發明之另一態樣中,係提供一種用於在行動 系統中排程無線電資源的方法。該方法包括接收一傳 道前序碼,判定該前序碼是否滿足預定標準,炅傳輸 對該傳送通道前序碼的回應,其中若判定該前序碼不 預定標準,則該回應包括一重新傳輸該傳送通道前序 請求,且若判定該前序碼滿足預定標準,則該回應包 已分配無線電資源的指示。 已涵蓋預定標準包括至少以下之一 ··一時間同步 誤率或用於施行時間同步之次數。已進一步涵蕙時間 之錯誤率係完美同步的80%。 已涵蓋該傳送通道係一隨機存取通道(rach)° ^ 涵蓋傳輸對傳举通道前序碼之回應包含傳輪一控制訊 已涵蓋若判定該前序瑪不滿足預定標準’該回應 栝一用於重新傳輸該傳送通道前序碼之簽名。進一步 0應 .一步 〇 RRC 時間 碼包 該傳 新傳 通訊 送通 一針 滿足 碼之 括一 之錯 同步 :一步 號。 更包 涵蓋 14 丄⑽623 該傳送通道前序碼係關聯於以下之一:一 RRC連接請求、 胞元更新、遞交、一無線電資源請求及時間同步的維持 較佳係’該方法更包括若判定該前序碼不滿足預定標準
道前序碼,且辨識以下之一: 及一包括在該重新傳輸傳送 符。 係提供一種用於在行動通訊 。該方法包括一行動通訊终 ;一網路’其判定該前序碼 輸針對該傳送通道前序碼 滿足預定標準時,該回應包 碼之請求,且若判定該前序 括一分配無線電資源之指 輸該傳送通道前序碼之請 輸該傳送通道前序碼,且若 源之指示’則使用已分配無 機存取通道(RACH)。進一步 傳輪的回應係一控制訊號β 係關聯於以下之一:一 RRc 無線電資源請求及時間 疋標準包括至少以下之一: 行時間同步之次數》較佳係 步的80%。 時,接收一重新傳輸之傳送通 該重新傳輸之傳送通道前序碼 通道前序碼中之重新傳輸指示 在本發明之另一態樣中, 系统中排程無線電資源的方法 端’其傳輸一傳送通道前序碼 是否滿足預定標準,該網路傳 的回應’若其判定該前序碼不 括一重新傳輸該傳送通道前序 瑪滿足預定標準,則該回應包 示’且若該回應包括一重新傳 求’則該行動通訊終端重新傳 該回應包括一已分配無線電資 線電資源傳輸資訊》 已涵蓋該傳送通道係一隨 涵蓋對於該傳送通道前序瑪之 已涵蓋該傳送通道前序瑪 連接請求、一胞元更新、遞交 同步的維持。已進一步涵蓋預 時間同步之一錯誤率或用於施 時間同步之該錯誤率係完美同 15 1356623 本發明之前述及其他目的、特徵、態樣及優點將可在 參考附圖後從以下本發明之詳細描述中更加瞭解。 以下說明將提出本發明之附加特徵及優點,且部分將 會從說明中瞭解,或可藉由本發明的實現而習得。應瞭解 本發明之以上一般性說明及以下詳細說明係範例性及解釋 性’且係意於提供本發明之申請專利範圍的進一步解釋。 熟習此項技術人士亦將可自參考附圖之具體實施例的 以下詳細說明中瞭解此等及其他範例性具體實施例,本文 之特徵不限於所揭示之任何特定具體實施例。 【實施方式】 現將參考附圖詳細說明本發明β本發明係於行動通訊 系統(諸如E-UMTS)中實施。然而,可將本發明應用於依據 其他規格操作的其他通訊系統。 本發明提出一種方法,藉由其當一终端使用一 RACH 傳輸RACH前序碼至基地台時,一基地台使用一特定控制 訊號請求重新傳輪一 RACH前序碼至該終端。該终端接收 該特定控制訊號’然後根據該對應控制訊號重新傳輸該 RACH前序碼至基地台。較佳係該特定控制訊號係針對該 RACH前序碼之回應資訊。
第7圖係顯示根據本發明在行動通訊系統中前序碼重 新傳輸方法的流程圖,其中一 RACH前序碼係由一終端重 新傳輸’以回應來自基地台之請求。如第7圖所示,該终端 傳輸一RACH前序碼傳輸至基地台,用於與基地台之RRC 16 1356623 連接請求、胞元更新、遞交、無線電資源請求或時間同步 之維持的目的(S 10)。
基地台將已接收RACH前序碼與預設特定標準(諸如時 間同步之錯誤率或時間同步的次數)比較,以判定rAch前 序碼接收是否符合該特定標準。例如,若與基地台之時間 同步的錯誤率係超過80%,則基地台判定額外需要—時間 同步重設。基地台亦可請求藉由二次以上之時間同步重設 的一時間同步驗證程序。 基地台根據該比較判定該已接收RACH前序碼不符合 標準或需要一驗證(S11)。因此,基地台在對於已自終端接 收之RAC Η前序碼的回應資訊中,不包括例如上行鏈路無 線電資源分配之資訊(S 1 2 ) » 該回應資訊僅包括ΤΑ及一重新傳輸指示符。重新傳輸 指示符通知該終端重新傳輸RACH前序碼。該回應資訊亦 可僅包括ΤΑ »
基地台可在回應資訊中包括附加資訊,例如RACH前 序碼簽名及RACH時機,终端將其二者用來重新傳輸RACH 前序碼。RACH時機指示用於使用RACH之一特定頻率及一 特定時間。 當從基地台接收用於RACH前序碼重新傳輸之請求 時,該終端重新傳輸RACH前序碼至基地台(S13)。該終端 使用包括於自基地台傳輸之回應資訊中的簽名作為一 RACH前序碼簽名。 依此方法,基地台可基於該簽名辨識該終端正重新傳 17 1356623 輸RACH前序碼。同樣地,可用一重新傳輸指示符來通知 基地台來自該终端之RACH前序碼重新傳輸。 基地台將來自终端的已接收重新傳輸RACH前序碼, 與預設特定標準(諸如時間同步之錯誤率或用於時間同步 - 的次數)比較,以判定重新傳輸RACH前序碼是否符合標準 (S 14)。當判定重新傳輪RACH前序碼符合標準或針對RACH 前序碼之驗證完成時,基地台傳輸回應資訊,其包括ΤΑ、 UE Id及上行鏈路無線電資源分配資訊(s丨5)。若终端使用 ^ RACH以維持時間同步’則回應資訊可僅包括ΤΑ » 該終端使用包括於回應資訊尹之ΤΑ重設與基地台的 時間同步,及使用上行鏈路無線電資源將資料傳輸至基地 台(S16)»若终端使用RACH以維持時間同步,則步驟s 1 6 可不施行。 如在此描述’當一终端將一 RACh前序碼傳輸至基地 台以使用一 RACH時,一基地台將已接收RACH前序碼與預 設特定標準(諸如用於時間同步之錯誤率或時間同步的次 Φ 數)比較。若RACH前序碼不符合標準,基地台請求至終端 之RACH前序碼的重新傳輪,以減少由於時間同步不精確 之資料傳輸失敗的機率,且減少與由其他终端傳輸之千擾。 由於本發明可依若干形式具體化而不脫離其精神或基 本特徵,故亦應了解除非另行說明,上述具醴實施例係不 受限於先前說明之任何細節,而是應廣義地視為在隨附申 * 請專利範圍界定之範疇内。因此,所有落入申請專利範圍 之計量和界限内’或此等計量和界限之等同者的改變及修 18 1356623 改,係預期由申請專利範圍所涵蓋。 前述具體實施例及優點係僅範例性且不應視為限制本 發明。可易於將本教示應用於其他類型之設備。
本發明之說明係意欲示範且不限制申請專利範圍之範 疇。熟習此項技術人士將會瞭解許多替代、修改及變化。 在申請專利範圍中,當施行引用功能時,構件加功能之子 句係意於涵蓋在此所述之結構,且不僅結構上等效而且係 等效結構。 【圖式簡單說明】 本文所包括之附圖提供對本發明之進一步瞭解,且係 併入與構成此規格書之一部分,附圖顯示本發明之具體實 施例且連同說明用以解說本發明之原理。在不同圖令由相 同數字參考之本發明特徵、元件及態樣表示依據一或多數 具體實施例之相同、等效或類似特徵、元件或態樣。
第1圖顯示係行動通訊系統之E-UMTS的網路結構,其可 應用於相關技術及本發明二者。 第2圖顯示無線電協定之控制平面的各層。 第3圖顯示無線電協定之使用者平面的各層。 第4圖顯示採用Dft-S-OFDM方法之傳輸器的結構。 第5圖顯示用於在無線電封包通訊系統之下行鏈路實 體層中實施HARQ的方法。 第6圖顯示一典型PracH之實例。 第7圖顯示根據本發明在行動通訊系統中前序碼重新 19 1356623 傳輸方法的流程圖。 【主要元件符號說明】 UE終端
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Claims (1)

135,6623 -—~ 1 加年午片θ日修正替換頁 第咖號專利案年f月修正 十、申請專利範圍: 1· 一種用於在一行動通訊系轉令排程(sheduling)無線電 資源的方法,該方法包含: 傳輸一傳送通道前序瑪(transport channel preamble);
接收一對於該傳送通道前序碼之傳輸的回應;及 使用已分配無線電資源重新傳輸該傳送通道前序 瑪與傳輸資訊其中之一, 其中若該回應包含一重新傳輸該傳送通道前序碼 之請求時,即重新傳輪該傳送通道前序碼,且若該回應 包含一已分配無線電資源的指示時,即傳輸該資訊。 2. 如申請專利範圍第1項所述之方法,其中該傳送通道係 一隨機存取通道(random access channel,RACH) ° 3. 如申請專利範圍第1項所述之方法’其中該對於該傳送 Φ 通道前序碼之傳輸的回應係一控制訊號。 4. 如申請專利範圍第1項所述之方法,其中該傳送通道前 序碼係關聯於以下之一:一 RRC連接請求、一胞元更 新、遞交、一無線電資源請求及時間同步的維持。 5. 如申請專利範圍第1項所述之方法,其中重新傳輸該傳 送通道前序碼包含使用一包括在該回應中之簽名。 21 1356623 11 …纖、.U 年'"月曰修(¾正替換頁I 1 ί 6.如申請專利範圍第1項所述之方法,其中重新傳輸該傳 送通道前序碼包含將一重新傳輸指示符包括在該已重 新傳輪前序碼中。 7. —種用於在一行動通訊系統中排程無線電資源的方 法,該方法包含:
接收一傳送通道前序碼; 判定該前序碼是否滿足預定標準;及 傳輸一對於該傳送通道前序碼的回應, 其中若判定該前序碼不滿足該等預定標準,則該回 應包含一重新傳輸該傳送通道前序碼之請求,且若判定 該前序碼滿足該等預定標準,則該回應包含一已分配無 線電資源的指不。
8·如申請專利範圍第7項所述之方法,其中該等預定標準 包含以下至少一者:時間同步之一錯誤率或用於施行時 間同步之次數。 9. 如申請專利範圍第8項所述之方法,其中時間同步之該 錯誤率係完美同步的80%。 10. 如申請專利範圍第7項所述之方法,其中該傳送通道係 一隨機存取通道(RACH)。 22 1356623 —— 年月曰修(更}正替換頁 11. 如申請專利範圍第7項所述之方法,其中傳輸該對於該 傳送通道前序碼的回應包含傳輸一控制訊號。 12. 如申請專利範圍第7項所述之方法,其中若判定該前序 碼不滿足該等預定標準,該回應更包含一用於重新傳輸 該傳送通道前序碼之簽名。
13.如申請專利範圍第7項所述之方法,其中該傳送通道前 序碼係關聯於以下之一:一 RRC連接請求、一胞元更 新、遞交、一無線電資源請求及時間同步的維持。
14_如申請專利範圍第7項所述之方法,若判定該前序碼不 滿足該等預定標準,則進一步接收一已重新傳輸傳送通 道前序碼,且辨識以下之一:該已重新傳輸傳送通道前 序碼之一簽名及包括在該已重新傳輸傳送通道前序碼 中之一重新傳輸指示符。 15. —種用於在一行動通訊系統中排程無線電資源的方 法,該方法包含: 一行動通訊終端,其傳輸一傳送通道前序碼; 一網路,其判定該前序碼是否滿足預定標準; 該網路傳輸一對於該傳送通道前序碼的回應,若其 判定該前序碼不滿足該等預定標準,則該回應包含一重 23 1356623 胍 4: if 平 .ψ 新傳輸該傳送通道前序碼之請求,且若判定該前序碼滿 足該等預定標準,則該回應包含一已分配無線電資源之 指示;及 若該回應包含一重新傳輸該傳送通道前序碼之請 求,則該行動通訊终端重新傳輸該傳送通道前序碼,且 若該回應包含一已分配無線電資源之指示,則使用已分 配無線電資源傳輸資訊。
16.如申請專利範圍第15項所述之方法,其中該傳送通道 係一隨機存取通道(RACH)。 17.如申請專利範圍第15項所述之方法,其中對於該傳送 通道前序碼之傳輸的該回應係一控制訊號。
18.如申請專利範圍第15項所述之方法,其中該傳送通道 前序碼係關聯於以下之一:一 RRC連接請求、一胞元 更新、遞交、一無線電資源請求及時間同步的維持。 19.如申請專利範圍第15項所述之方法,其中該等預定標 準包含至少以下之一:時間同步之一錯誤率或用於施行 時間同步之次數。 2 0.如申請專利範圍第19項所述之方法,其中時間同步之 該錯誤率係完美同步的80%。 24
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