552816 A7 _____ B7 五、發明説明（1 ~ ~--- 發明範疇 本發明係有關於減少或免除行動電信系統無線電 網路的資料損失。 、、私子 發明背景 歐洲電信標準學會（ETSI)目前在處理有關行動電作系 統的一新組協定標準化。該新的協定組已知是全球行動電 信系統（UMTS)。此第三代標準亦時常稱為3Gpp。 圖1係描述包括一核心網路2及一 UMTS地面無線電存取 網路（UTRAN)3的UMTS網路1。UTRAN 3係包含許多無線電網 路控制器（RNCs) 4，其每個係耦合到一組相鄰基地台（BSs) 5 °該等基地台時常稱為節點b。每個節點b 5是負責一特定 地域單元，而且控制的RNC 4是負貴在節點B 5與核心網路2 之間的路由使用著與信號資料。所有RNCs是彼此耦合（在 RNC之間的介面認為是iur介面）。UTRAN 3的一般概述是在 3rd Generation Partnership Project, ETSI的技術規格 編號TS 25.401 V2.0.0 (1 999-09)中提供。 使用者與信號資料係使用無線電存取傳輸器（RABs)而 在一 RNC與一行動終端機之間傳輸（在UTRAN稱為使用者設 備（UE))。典型上，一使用者設備是配置給一或多個無線電 存取傳輸器（RABs)，其每個是運送使用者或信號資料流， 而且每個RAB係映射到一對應的邏輯通道。在RNC，每個RAB 係透過一對應的無線電鏈路控制-器（RLC)實體而處理。特別 是’ 一特定RAB的資料係暫時保存在RLC緩衝器。在一媒體 存取控制（MAC)層，資料封包（即是RLC協定資料單元 -5- 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐） 552816 A7 B7 五、發明説明（2 ) (PDUs))是從RLC緩衝器擷取及處理，以映射到一傳輸通道 的一組邏輯通道，該組邏輯通道有兩種類型：一"共通"的 傳輸通道類型，其是由不同的行動終端機共用、及一 ”專 屬"的傳輸通道類型，其係配置給單一行動終端機。有8 個共通傳輸通道類型，一類型是一下行鏈路共用通道 (DSCH)。兩其他共通的通道類型是前向存取通道（FACH)與 隨機存取通道（RACH)。有3個專屬通道類型，一類型是專屬 通道（DCH)。在RNC與節點B呈現的各種不同協定層是在圖2 描述。 進一步考慮在RNC與使用者設備呈現的MAC層，此可提供 一 MAC-c實體及一 MAC-d實體，每個是負責從RLC緩衝器擷取 的RLC PDUs構成MAC PDUs。一路由通道訊框係包含一或多 個MAC PDUs。該MAC-d實體是負責一特定使用者設備可使用 任何DCHs的傳輸格式組合與傳輸格式。MAC-c實體是處理配 置給一特定組使用者設備的任何共通傳輸通道的傳輸格式 組合與傳輸格式。只要從RRC接收命令，MAC-d實體便可負 責執行在一使用者設備的傳輸通類型之間的通道開關。RRC 係負貴連接MAC-d與MAC-c實體，以允許前者與MAC-c實體通 信轉變決定。 在節點Bs實施的實體層上，經由一 MAC-d實體構成的 DCHs是映射到一專屬的實體資料通道（DPDCH)，用以在傳播 介面上傳輸給使用者設備。在MAC-c實體上，CCHs、FACH 和RACH是分別映射到一輔助共通控制實體通道（S-CCPCH) 及一實體隨機存取通道（PRACH)，而DSCHs是映射到一實體 -6- 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐） 裝 訂552816 A7 _____ B7 V. Description of the invention (1 ~ ~ --- The scope of the invention The invention relates to reducing or exempting the data loss of the mobile telecommunication system radio network. Background of the Invention of the European Telecommunications Standards Institute (ETSI) A new set of protocols dealing with mobile telecommunications systems is standardized. This new set of protocols is known as the Global System for Mobile Telecommunications (UMTS). This third generation standard is also often referred to as 3Gpp. And a UMTS network 1 of a UMTS terrestrial radio access network (UTRAN) 3. The UTRAN 3 series contains a number of radio network controllers (RNCs) 4, each of which is coupled to a set of adjacent base stations (BSs) 5 ° These base stations are often referred to as node b. Each node b 5 is responsible for a specific regional unit, and the RNC 4 that controls it is expensive. The routing between node B 5 and core network 2 uses signal data. All RNCs are coupled to each other (the interface between RNCs is considered the iur interface). A general overview of UTRAN 3 is provided in 3rd Generation Partnership Project, Technical Specification Number ETSI TS 25.401 V2.0.0 (1 999-09). Use By Signal data is transmitted between an RNC and a mobile terminal using radio access transmitters (RABs) (referred to as user equipment (UE) in UTRAN). Typically, a user equipment is allocated to one or more Radio access transmitters (RABs), each of which carries a user or signal data stream, and each RAB is mapped to a corresponding logical channel. In the RNC, each RAB is controlled through a corresponding radio link -RLC entity processing. In particular, the data of a specific RAB is temporarily stored in the RLC buffer. At a media access control (MAC) layer, the data packet (that is, the RLC protocol data unit -5- this paper) The standard is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 552816 A7 B7 V. Description of Invention (2) (PDUs)) is a group of RLC buffers extracted and processed to map to a group of transmission channels Logical channels, this group of logical channels have two types: a "common" transmission channel type, which is shared by different mobile terminals, and a "exclusive" transmission channel type, which is configured for a single action Terminal. There are 8 There are two common transmission channel types, one type is the downlink shared channel (DSCH). The two other common channel types are the forward access channel (FACH) and random access channel (RACH). There are three dedicated channel types. One type is the Dedicated Channel (DCH). Various different protocol layers presented at the RNC and the Node B are described in Figure 2. Further considering the MAC layer presented by the RNC and the user equipment, this can provide a MAC-c entity and a MAC-d entity, each of which is responsible for the RLC PDUs retrieved from the RLC buffer to form MAC PDUs. A routing channel frame contains one or more MAC PDUs. The MAC-d entity is responsible for a particular user equipment's use of any DCHs transmission format combination and transmission format. The MAC-c entity is a combination of transmission formats and transmission formats that handles any common transmission channel allocated to a particular group of user equipment. As long as a command is received from the RRC, the MAC-d entity may be responsible for performing channel switching between transmission types of a user equipment. RRC is responsible for connecting MAC-d and MAC-c entities to allow the former to communicate with MAC-c entities. On the physical layer implemented by Node Bs, the DCHs constituted by a MAC-d entity are mapped to a dedicated physical data channel (DPDCH) for transmission to the user equipment on the propagation interface. On the MAC-c entity, CCHs, FACH, and RACH are mapped to an auxiliary common control entity channel (S-CCPCH) and a physical random access channel (PRACH), respectively, and DSCHs are mapped to an entity-6- This paper Standards apply to China National Standard (CNS) A4 (210 X 297 mm) binding
線 552816 A7 B7 五、發明説明（3 ) 下行鏈路通道（PDSCH)。更明確而言，一路由通道（專屬或 共通）的每個訊框是映射到在節點B的一實體通道的對應訊 框。為了要有效使用節點B的資源，一 RNC的目標是將每個 路由通道訊框傳遞給節點B，並且結合在該實體通道的適 當訊框（此可避免節點B需要較大的資料緩衝器）。為了要將 此達成，RNC係維持每個節點B的一偏移值，該偏移值是近 似在節點B的内部時脈與RNC之間的偏移值。隨著使用該偏 移值，RNC可計算何時一路由通道訊框應該傳送給節點B， 為了及時到達以包括在適當的實體通道訊框。 對於許多的理由而言，一節點B的偏移值可能是錯誤的 。如果嚴格錯誤，一路由通道訊框便會太晚到達節點B，以 致於不包括在適當實體通道訊框。其中，它包含的接收的 路由通道訊框與PDUs會被節點B丟棄，而增加位元錯誤率 (BER)。節點B將建議RNC使用時序調整訊息更正偏移值。然 而，MAC層並不關心節點B丟棄資料的重新傳送。而是從RLC 緩衝器獲得新的RLC PDU，構成新的MAC PDUs，及將這些傳 送給在路由通道訊框中的節點B。錯誤更正是較高層負責 (例如RLC)。 在一使用者設備與網路之間的一使用者連接建立之後 ，網路可決定將連接從一通道類型連接到另一通道類型。 在通道切換期間，偏移錯誤會變成較嚴重，而且因此BER 會提高。當在節點B之間移交無線電鏈路時，此亦會發生。 發明之說明 本發明的一目的是要克服使一 R N C與一節點B適當同步 本纸張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐) 552816 A7 B7 五、發明説明（4 ) 失敗所引起的問題。此及其他目的是在先前傳送給節點β 的資料太晚接收而不包括在配置實體通道訊框情況，透過 從傳輸RNC MAC實體提供資料重新傳送而可至少部分達成。 根據本發明的一第一觀點提供控制資料流的方法封包 ，註定對使用者設備（使用者設備），在無線電網路控制器 (RNC)和UMTS地面無線電存取網路（UTRAN)的_節點B之間 ，其中節點B是與RNC同步，為了允許從RNC傳送的mac PDUs 可及時到達節點B，以便包括在配置的實體通遒訊框，該方 法係包含_: 將一 MAC PDU從RNC的一 MAC實體傳送給節點b,而在傳輸 MAC實體上維持該傳送MAC PDU的一副本；及 在節點B不能在配置的實體通道訊框上傳輸該傳送的 MAC PDU情況中，將一通知從節點B傳送給傳輪的mac實體， 並且將MAC PDU從該MAC實體重新傳送給節點B。 本發明的具體實施例是經由在傳輸MAC實體中緩衝一傳 送MAC PDU而可減少從一 RNC與一傳輸節點B之間的一嚴重 同步損失造成位元錯誤率（BER)產生，藉使經由節點B太晚 接收而不包括在配置實體通道訊框的MAC PDUs可重新傳送。 一 MAC PDU是傳送給一路由通道訊框的節點B。訊框包含 數個其他MAC PDUs。理想上，該通知是訊框處理協定的一 時序調整訊息，而且是有關一特定路由通道訊框的所有MAC PDUs 〇 - 傳輸的MAC實體可以是一MAC-c實體，其中，MAC PDU是 傳送給節點B，用以包括在S-CCPCH、或PDSCH訊框；或一 -8 - 本紙張尺度適用中國國家標準(CNS) A4規格(210X297公釐） 裝 訂Line 552816 A7 B7 V. Description of the invention (3) Downlink channel (PDSCH). More specifically, each frame of a routing channel (exclusive or common) is mapped to a corresponding frame of a physical channel at node B. In order to effectively use the resources of Node B, the goal of an RNC is to pass each routing channel frame to Node B and combine it with the appropriate frame of the physical channel (this can avoid that Node B needs a larger data buffer) . In order to achieve this, the RNC maintains an offset value for each Node B, which is an offset value approximately between the internal clock of the Node B and the RNC. With the use of the offset value, the RNC can calculate when a routing channel frame should be transmitted to the Node B for timely arrival to be included in the appropriate physical channel frame. For many reasons, the offset value of a node B may be wrong. If it is strictly wrong, a routing channel frame will arrive at Node B too late to be included in the appropriate physical channel frame. Among them, the received routing channel frames and PDUs contained in it will be discarded by Node B and increase the bit error rate (BER). Node B will recommend that the RNC use timing adjustment messages to correct the offset value. However, the MAC layer does not care about the retransmission of data discarded by Node B. Instead, new RLC PDUs are obtained from the RLC buffer to form new MAC PDUs, and these are transmitted to Node B in the routing channel frame. Error correction is the responsibility of higher layers (e.g. RLC). After a user connection between a user equipment and the network is established, the network may decide to connect the connection from one channel type to another channel type. During channel switching, the offset error becomes more severe and therefore the BER increases. This also happens when the radio link is handed over between Node Bs. DESCRIPTION OF THE INVENTION An object of the present invention is to overcome the need to properly synchronize an RNC and a Node B. This paper size is applicable to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 552816 A7 B7. 5. Description of the invention (4) Problems caused by failure. This and other objectives are to receive data that was previously transmitted to node β too late to be included in the configuration physical channel frame. This can be achieved at least in part by providing data retransmission from the transmitting RNC MAC entity. According to a first aspect of the present invention, a method packet for controlling a data stream is provided, which is destined for a user equipment (user equipment) at a node of a radio network controller (RNC) and a UMTS terrestrial radio access network (UTRAN). Between B, where Node B is synchronized with RNC, in order to allow mac PDUs transmitted from RNC to reach Node B in time, so as to be included in the configured physical communication frame, the method includes _: removing a MAC PDU from the RNC A MAC entity transmits to node b, and a copy of the transmitted MAC PDU is maintained on the transmitting MAC entity; and in the case where Node B cannot transmit the transmitted MAC PDU on the configured physical channel frame, a notification is sent to the slave node B transfers to the mac entity of the round, and retransmits the MAC PDU from the MAC entity to the node B. A specific embodiment of the present invention is to reduce a bit error rate (BER) caused by a severe synchronization loss between an RNC and a transmission node B by buffering a transmission MAC PDU in a transmitting MAC entity. MAC PDUs received by B too late and not included in the configured physical channel frame can be retransmitted. A MAC PDU is transmitted to Node B of a routing channel frame. The frame contains several other MAC PDUs. Ideally, the notification is a timing adjustment message of the frame processing protocol, and it is all MAC PDUs related to a specific routing channel frame. The MAC entity transmitted may be a MAC-c entity, where the MAC PDU is transmitted to Node B to be included in the S-CCPCH or PDSCH frame; or -8-This paper size applies the Chinese National Standard (CNS) A4 specification (210X297 mm) binding
線 552816 A7 B7 五、發明説明（5 )Line 552816 A7 B7 V. Description of the invention (5)
MAC-d實體，其中，MAC PDU可被傳送，用以包括在一 DPDCH 訊框。 理想上，傳送的MAC實體可在它的緩衝器中儲存在傳送 路由通道訊框中所包含的MAC PDUs的一副本。 本發明係特別適於在一通道切換期間、或在一交遞期間 減少BER，例如一共通路由通道（例如FACH、RACH)到一專屬 通道（DCH)。 可了解到，一旦要求，傳輸的MAC實體可從RNC的一 RLC 實體接收資料。傳送給使用者設備的資料可儲存在RLC實體 的一或多個緩衝器，並且經由傳輸的MAC實體而從其擷取。 傳輸的MAC實體具有與它有關的一緩衝器，而且是儲存傳送 的 MAC PDU 。 根據本發明的一第二觀點，其係提供使用在一 UMTS系統 的UMTs地面無線電存取網路（UTRAN)的一無線電網路控制 器，該RMC係包含一 MAC實體，其配置可將MAC PDUs傳送給 UTRAN的一節點B，用以在傳播介面上傳輸給使用者設備 (UE)的一對等MAC實體，該傳輸的MAC實體具有：儲存裝置 ’用以儲存一傳送MAC PDU的一副本；及傳輸裝置，用以在 MAC實體從節點b接收一通知的情況將MAC PDU重新傳送，而 且MAC PDU並未及時接收，用以包括在一配置的實體訊框。 說明 圖1係描述包含一核心網路及一 UTRAN的UMTS網路； 圖2係描述在圖UTRAN的一 RNC與節點B上呈現的協定 層；及 -9 - 本紙張尺度適财關家標準(cns) Μ規格(⑽χ 297公爱） 裝 訂A MAC-d entity, in which MAC PDUs can be transmitted for inclusion in a DPDCH frame. Ideally, the transmitting MAC entity can store a copy of the MAC PDUs contained in the transmission routing channel frame in its buffer. The present invention is particularly suitable for reducing BER during a channel switching or during a handover, for example, a common path from a channel (such as FACH, RACH) to a dedicated channel (DCH). It can be understood that, upon request, the transmitting MAC entity can receive data from an RLC entity of the RNC. The data transmitted to the user equipment may be stored in one or more buffers of the RLC entity and retrieved from it via the transmitted MAC entity. The transmitted MAC entity has a buffer associated with it and stores the transmitted MAC PDU. According to a second aspect of the present invention, it provides a radio network controller for UMTs terrestrial radio access network (UTRAN) in a UMTS system. The RMC includes a MAC entity, which is configured to convert MAC PDUs. A node B transmitted to UTRAN for transmitting to a pair of MAC entities of a user equipment (UE) on a propagation interface, the transmitted MAC entity having: a storage device 'for storing a copy of a transmitted MAC PDU; And a transmission device for retransmitting the MAC PDU when the MAC entity receives a notification from the node b, and the MAC PDU is not received in time, and is used to include a configured physical frame. Explanation Figure 1 depicts a UMTS network including a core network and a UTRAN; Figure 2 depicts the protocol layers presented on an RNC and Node B in the Figure UTRAN; and -9-this paper standard is suitable for financial management standards ( cns) Μ specifications (⑽χ 297 公 爱) binding
線 552816 A7 B7 五、發明説明（6 ) 圖3用以減少圖1的UTRAN資料損失的一處理流程圖。 較佳具體實施例之詳細說明 一 UMTS網路的一般結構是參考圖1描述。各種不同協定 層是參考圖2描述。 現要考慮下行鏈路方向的資料傳輸，設計給使用者設備 的信號與使用者資料封包是在服務RNC的RLC實體上接收， 而且是放置在配置的RLC缓衝器。RLC實體是（邏輯性）耦合 到一 MAC-d實體。它是RRC實體，而可決定設計給一給定使 用者設備的資料路由是否在一前向存取通道（FACH)、下行 鏈路共用通道（DSCH)、或一專屬通道（DCH)上傳輸。該MAC-d 實體是負貴執行一通道開關。 假設一使用者設備係配置一DPDCH，服務RNC的MAC-d實 體可將邏輯通道（或一專屬控制通道（DCCH)或一專屬路由 通道（DTCH))映射到DCHs。此需要該MAC-d實體從適當的RLC 緩衝器擷取RLC SDUs，並且建構MAC-d服務資料單元（SDUs) ，其包含：一有效負荷區段，其包含邏輯通道資料；及一 MAC標題，其包含一邏輯通道識別符。一DCH訊框是由數個 MAC PDUs組成，而且是（經由用在DCH資料流訊框協定實體 的UTRAN Iur和Iub介面資料傳輸與傳輸信號）傳遞給該節 點B的第一層實體。在該第一層實體上，該等DCHs是在用於 I ub介面傳輸的單一專屬實體通道（DPCH)上多工。此是包括 將DCH訊框置於實體通道的適常訊框（實際上，DCH訊框是先 分割或串接、編碼、與插入）。 其中一使用者設備是在一輔助的共通控制實體通道 -10- 本紙張尺度適用中國國家標準(CNS) A4規格(210 X 297公釐） 552816 五 A7 - B7發明説明（7 ) (S-CCPCH)上配置空間，它是MAC-d實體，而且可從RLC緩衝 器擷取RLC SDUs，為了要然後將映射邏輯通道的MAC-c實體 傳送給一 CCH或一 DSCH。一 CCH或DSCH是從數個MAC-c PDUs 組裝，而且（再次經由用於DCH信號資料流訊框協定實體的 UTRAN Iur和Iub介面資料傳輸與傳輸信號）傳遞給節點B的 第一層實體，用以一共通實體通道（CPCH)多工。 為了要減少在Iur介面（在RNC與節點B之間）使用的訊框 處理複雜度，當一路由通道訊框必須傳送而為了包括在配 置的實體通道訊框時，該等傳輸實體可維持能評估的一時 脈偏移測量。只要此偏移錯誤很小，路由通道訊框便可由 節點B及時接收，並且傳送給使用者設備。然而，如果錯誤 變成、較明顯，路由通道訊框便較慢到達節點B，並且丟棄不 傳送。為了要減少錯誤，時序調整訊息送在I ur介面上使用 訊框處理協定傳送。一時序調整訊息係包含較慢路由通道 訊框的第一 MAC PDU(或傳輸區塊）識別、及在該訊框的MAC PDUs總數。MAC實體係使用在這些訊息包含的資訊以更正時 脈偏移。 為了要避免偏移錯誤較大情況的整個傳送資料損失（且 一資料封包是由節點B丟棄），RNC的傳送MAC實體（MAC-c或 MAC-d)可暫時維持在一 MAC缓衝器中每個傳送MAC PDU的一 副本。此通常包括維持在一傳送路由通道訊框中包含所有 MAC PDUs的一副本。如果一時序-調整訊息是在一路由通道 訊框傳送之後接收，傳送實體便可決定該路由通道訊框是 否太晚接收而不能在Iur介面上傳送。然而，當PDUs仍然經 裝 訂Line 552816 A7 B7 V. Description of the invention (6) FIG. 3 is a processing flowchart for reducing the UTRAN data loss of FIG. 1. Detailed description of the preferred embodiment A general structure of a UMTS network is described with reference to FIG. Various different protocol layers are described with reference to FIG. Now it is necessary to consider the data transmission in the downlink direction. The signals and user data packets designed for the user equipment are received on the RLC entity serving the RNC and placed in the configured RLC buffer. An RLC entity is (logically) coupled to a MAC-d entity. It is an RRC entity and determines whether data routing designed for a given user device is transmitted on a forward access channel (FACH), a downlink shared channel (DSCH), or a dedicated channel (DCH). The MAC-d entity is a one-way switch that performs the task. Assuming that a user equipment is configured with a DPDCH, the MAC-d entity serving the RNC can map a logical channel (or a dedicated control channel (DCCH) or a dedicated routing channel (DTCH)) to DCHs. This requires that the MAC-d entity retrieves RLC SDUs from the appropriate RLC buffer and constructs MAC-d service data units (SDUs), which include: a payload section containing logical channel data; and a MAC header, It contains a logical channel identifier. A DCH frame is composed of several MAC PDUs and is transmitted to the first layer entity of the node B (via the UTRAN Iur and Iub interface data transmission and transmission signals used in the DCH data flow frame protocol entity). On the first layer entity, the DCHs are multiplexed on a single dedicated physical channel (DPCH) for Iub interface transmission. This is a normal frame that includes placing the DCH frame in the physical channel (actually, the DCH frame is first divided or concatenated, encoded, and inserted). One of the user equipment is an auxiliary common control entity channel-10- This paper size applies to the Chinese National Standard (CNS) A4 specification (210 X 297 mm) 552816 Five A7-B7 invention description (7) (S-CCPCH ), It is a MAC-d entity, and RLC SDUs can be retrieved from the RLC buffer in order to then transfer the MAC-c entity mapping the logical channel to a CCH or a DSCH. A CCH or DSCH is assembled from several MAC-c PDUs and passed (again via the UTRAN Iur and Iub interface data transmission and transmission signals for the DCH signal data frame protocol entity) to the node B's first layer entity, Multiplexed with a Common Physical Channel (CPCH). In order to reduce the complexity of the frame processing used in the Iur interface (between RNC and Node B), when a routing channel frame must be transmitted and in order to be included in the configured physical channel frame, these transmission entities can maintain the capability Evaluation of a clock offset measurement. As long as this offset error is small, the routing channel frame can be received by Node B in time and transmitted to the user equipment. However, if the error becomes more obvious, the routing channel frame arrives at Node B more slowly and is discarded and not transmitted. To reduce errors, timing adjustment messages are sent on the Iur interface using a frame processing protocol. A timing adjustment message includes the first MAC PDU (or transmission block) identification of the slower routing channel frame and the total number of MAC PDUs in the frame. The MAC real system uses the information contained in these messages to correct the clock offset. In order to avoid the entire transmission data loss with large offset errors (and a data packet is discarded by Node B), the transmitting MAC entity (MAC-c or MAC-d) of the RNC can be temporarily maintained in a MAC buffer One copy of each transmitted MAC PDU. This usually includes maintaining a copy of all MAC PDUs in a transport routing channel frame. If a timing-adjustment message is received after a routing channel frame is transmitted, the transmitting entity can determine whether the routing channel frame is received too late to be transmitted on the Iur interface. However, when PDUs are still bound
線 -11 - 本紙張尺度適用中國國家標準(CNS) A4規格(210X 297公釐) 552816 A7 ~ B7 五 發明説明（8 ) 由傳輸MAC實體儲存時，MAC實體可將PDUs重新傳送給節點B 進行時間偏移調整。此處理可重複數次，直到MAC實體“同 步”到節點B為止。 圖3係進一步描述此同步處理的流程圖。 在技藝中熟諳此技者能了解到各種不同修改可在上述 具體實施例中達成，而不致於達背本發明的範圍。 -12- 本紙張尺度適用中國國家標準(CNS) A4規格(210X297公釐)Line-11-This paper size applies Chinese National Standard (CNS) A4 specification (210X 297 mm) 552816 A7 ~ B7 Five inventions description (8) When stored by the transmitting MAC entity, the MAC entity can retransmit PDUs to Node B for Time offset adjustment. This process can be repeated several times until the MAC entity "synchronizes" to Node B. FIG. 3 is a flowchart further describing this synchronization process. Those skilled in the art can understand that various modifications can be made in the above specific embodiments without departing from the scope of the present invention. -12- This paper size applies to Chinese National Standard (CNS) A4 (210X297 mm)