WO2007121635A1 - Procédé de retransmission d'une unité de données de commande d'un protocole de commande à liaison sans fil en mode de reconnaissance - Google Patents

Procédé de retransmission d'une unité de données de commande d'un protocole de commande à liaison sans fil en mode de reconnaissance Download PDF

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Publication number
WO2007121635A1
WO2007121635A1 PCT/CN2006/003680 CN2006003680W WO2007121635A1 WO 2007121635 A1 WO2007121635 A1 WO 2007121635A1 CN 2006003680 W CN2006003680 W CN 2006003680W WO 2007121635 A1 WO2007121635 A1 WO 2007121635A1
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data unit
control data
retransmission
control
threshold
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PCT/CN2006/003680
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English (en)
French (fr)
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Yunxiang X?
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Zte Corporation
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00Arrangements for detecting or preventing errors in the information received
    • H04L1/12Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18Automatic repetition systems, e.g. Van Duuren systems

Definitions

  • the present invention relates to a wideband code division multiple access system, and more particularly to a retransmission of a 4-space data unit in a wireless network controller protocol acknowledgement mode.
  • Strategy. BACKGROUND In a WCDMA (Wideband Code Division Multiple Access) system, there are three data transmission methods in the RLC (Radio Link Control) protocol layer of an RNC (Radio Network Controller) network element: Transparent mode (TM), unacknowledged mode (UM), and acknowledge mode (Acknowledged mode, ⁇ ).
  • TM Radio Link Control
  • UM unacknowledged mode
  • acknowledge mode Acknowledged mode
  • the AM mode ensures the reliable transmission of data through the transmission confirmation process between the data sender and the data receiver.
  • the protocol architecture is shown in Figure 1.
  • the data transmission process is: a) Sender (transmitter) receives RLC SDU (Service Data Unit service data unit) sent from higher layer > generates RLC PDU (Protocol Data Unit control data unit); b) Sender sends RLC according to transmission capability PDU, update the send window, and the LC PDU is stored in the retransmission sequence until the send window closes to stop sending the AMD PDU; c) The Receiver RLC protocol layer receives the RLC AMD PDU, and if properly received, the Receiver sends an ACK (acknowledgement) status to the Sender.
  • RLC SDU Service Data Unit service data unit
  • RLC PDU Protocol Data Unit control data unit
  • Sender sends RLC according to transmission capability PDU, update the send window, and the LC PDU is stored in the retransmission sequence until the send window closes to stop sending the AMD PDU
  • the Receiver RLC protocol layer receives the RLC AMD PDU, and if properly received, the Receiver sends an ACK (acknowledge
  • ACK STATUS REPORT otherwise send NACK (NACK STATUS REPORT); d) Sender receives Receiver status report, according to the type of status report, if it is ACK, it will retransmit the corresponding sequence
  • the RLC PDU is deleted, and the transmission window is updated. If it is a NACK, the corresponding RLC PDU is retransmitted, and the retransmitted RLC PDU has a higher priority than the first transmitted RLC PDU.
  • the number of AMD PDUs sent by the Sender is controlled by the TFC (Transport Format). Therefore, the effective rate of the transmission is limited by the number of retransmitted AMD PDUs. When the number of retransmitted AMD PDUs increases, the effective data transmission rate decreases. . Receiver status report (STATUS REPORT) according to 3GPP TS 25.322 protocol
  • Timer—Status_Prohibit is in an invalid or timeout state.
  • Receiver sends a status report to Sender.
  • Sender determines the total number of AMD PDUs (including retransmitted AMD PDUs) sent in the next scheduling period based on the status.
  • the Receiver is usually required to send a STATUS REPORT to the Sender in time, so that the Sender can update the sliding window in time to ensure that the Sender can update the sliding window in time.
  • Normal delivery of business data Assuming the traffic rate is V, the valid data payload of the AMD PDU is b, and the transmission window is W.
  • the latest time to receive the first STATUS is Wb/V, so if the traffic rate is larger, the required time interval is shorter.
  • Sender will cause the data to be sent to 0 because the send window is closed.
  • Sender assumes that the Sender received the NACK status of the A PDU at time t1, and then resends the A PDU.
  • the status report of this retransmission will be received after 180ms, and for Receiver, the status report will be sent to Sender after 80ms at the latest, and the A PDU will still be reported to Sender, and the Sender A PDU will be notified to be lost.
  • the status report will be received 130 minutes after Sender resends the A PDU (assuming Sender to Receiver ⁇ network delay and Receiver to Sender network delay ⁇ then, for Sender, the A PDU is unnecessarily retransmitted Processing, wasting transmission bandwidth.
  • the report prohibits the timer from being generally set to 20ms, and the network delay is calculated by 100ms, which is at least 6 times the network error rate.
  • the present invention provides a retransmission method of a control data unit of a radio link control protocol in an acknowledge mode, which is characterized in that it comprises: adding a state variable in a control data unit, and transmitting a control data unit each time The state variable is marked with a system time label; if a negative answer of the control data unit is received, a difference between the current system time and the time label is calculated, and the control data is performed by the difference Retransmission control of the unit to reduce the retransmission frequency.
  • the above method is characterized in that: performing retransmission control of the control data unit by using the difference, comprising: determining whether the difference is greater than a threshold, and retransmitting the control data unit, otherwise giving up hair.
  • Step 1 The transmitter of the radio link control protocol layer receives the control data unit from the upper layer; Step 2, the transmitter adds the state variable to the control data unit And the state variable is marked with a system time label; Step 3, the transmitter sends the control data unit to a receiver of a radio link control protocol layer, and stores the control data unit in a retransmission sequence; Step 4: The transmitter receives a status report from the receiver, and if the status report is a negative response of the control data unit, calculating a difference between a current system time and the time label; Step 5: If it is determined whether the difference is greater than a threshold value, the system time label of the control data unit is updated and the process proceeds to step 3 to resend the control data unit, otherwise the retransmission is abandoned.
  • the above method is characterized in that the threshold value is set according to a status report interval t and a network loopback delay T in the radio link control protocol.
  • the above method is characterized in that, if t > T, the threshold value is set to -1, and in the step 5, the method further includes: if the threshold value is -1, exiting the processing flow; If t ⁇ ⁇ , the threshold is set to ⁇ % ⁇ , where the parameter X is a value configured according to the actual application.
  • the above method is characterized in that the parameter X is 80.
  • the method further includes: if the status is a confirmation response of the control data unit, and 4 is updated according to the sequence number of the control data unit that is correctly received.
  • the present invention adopts a method of time stamping a PDU in a retransmission queue, and when a retransmission is required, calculating a difference between a current time and a time cu of the PDU, when the threshold of the difference is greater than a certain threshold Retransmission is performed, otherwise the retransmission is abandoned to reduce the overhead of network retransmission.
  • FIG. 1 is a schematic diagram of a structure of a mode of operation of a mode 8;
  • FIG. 2 is a flow chart of a method for retransmitting an RLC AM mode provided by the present invention.
  • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The implementation of the technical solution will be further described in detail below with reference to the accompanying drawings.
  • the method of the present invention mainly adds an RLC State Variable (VT), when the AMD PDU is sent (including retransmission), Put VT (TAG) on the system time stamp.
  • VT RLC State Variable
  • TAG Put VT
  • TAG Volume VT
  • the threshold TimeThreshold it is related to the Status Report interval network loopback delay in the RLC AM protocol.
  • the Status and the Polling related parameters in the protocol are related to the Status Report related parameters. Assuming the Status Report interval is t and the network loopback delay is ⁇ , then the following setting strategy can be used:
  • ⁇ t > ⁇ that is, the Status Report interval is greater than the network loopback delay
  • set the TimeThreshold to -1, indicating that the processing of the data is not processed in the processing of data transmission and reception (that is, if the status report interval
  • the correlation processing performed by the present invention is not performed, that is, when the lost PDU is retransmitted, it is necessary to judge the ratio of the time interval between the last retransmission and the retransmission to the threshold)
  • t ⁇ T that is, the Status Report interval is less than the network loopback delay
  • set TimeThreshold T* 80%, where the percentage is a configurable value to be flexible in practical applications.
  • Step 201 The Sender RLC protocol layer receives a high-level RLC AMD PDU (numbered a); Step 202 Sender sends the RLC AMD PDU to the Receiver and stores it in the retransmission sequence. Step 203: The status variable VT (TAG) of the currently sent AMD PDU will be updated. Step 204: Determine whether the Sender receives the status report sent by the Receiver.
  • Step 205 Determine whether it is NACK, if yes, go to step 206, otherwise go back to step 201;
  • the method of the present invention can also be subdivided into the following steps: l)
  • the Sender AM RLC entity receives the RLC SDU sent from the upper layer.
  • the AM RLC entity divides or cascades the RLC SDU to construct the LC AMD PDU.
  • the AM RLC entity divides or cascades the RLC SDU to construct the LC AMD PDU.
  • Receiver After Receiver receives the PDU sent by Sender, Receiver sends Status Report to Sender according to the setting of status report system parameters.
  • the Sender After receiving the Receiver, the Sender updates the sending window according to the sequence number of the correctly received PDU, ensuring that the sending window does not close.
  • Sender calculates SystemTime - VT(TAG), where SystemTime is the current time of the system, and VT(TAG) is the time stamp sent when the AMD PDU is sent.
  • the receiver Since the status report interval is 20ms, starting from the 46th TTI, 48, 50, 52, 54, 56, 58 TTI The status report is sent.
  • the receiver receives the 113 AMD PDU retransmitted by the sender at 54 TTI, and informs the sender in the status report that the AMD PDU No. 113 is not retransmitted.
  • the sender will receive a status report of the lost A13 PDU at 56, 58, 60, 62, 64, 66 TTI for retransmission.
  • the receiver At the 68th TTI, the receiver will receive the sender's transmission at 60 TTI.
  • the ACK of the No. 113 PDU is not retransmitted in 4 ⁇ .
  • the sender does not retransmit the 113 AMD PDIL at the 68th TTI.
  • retransmission of the 113 AMD PDU at 56 to 66 TTI is repeated, wasting system bandwidth.
  • the method can effectively solve the problem of resource waste and bandwidth utilization caused by retransmission in the WCDMA high-rate service by setting the AMD PDU time label.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Description

确认模式下无线链路控制协议的控制数据单元的重传方法 技术领域 本发明涉及宽带码分多址***,特别是涉及无线网络控制器协议确认模式 下的一种 4空制数据单元的重传策略。 背景技术 在 WCDMA ( Wideband Code Division Multiple Access,宽带码分多址) 系 统中, 位于 RNC (无线网络控制器)网元的 RLC ( Radio Link Control,无线链路 控制) 协议层有三种数据传送方式: 透明模式 (TM )、 非确认模式 (UM ) 和 确认模式( Acknowledged mode ,ΑΜ )。 其中 AM模式通过数据发送方和数据接 收方之间的发送 确认流程, 保证数据的可靠性传输, 协议构架如附图 1所 示。 数据发送流程为: a) Sender (发送器)接收从高层发送来的 RLC SDU ( Service Data Unit服 务数据单元) > 生成 RLC PDU ( Protocol Data Unit控制数据单元); b) Sender根据发送能力, 发送 RLC PDU, 更新发送窗口, 并且 LC PDU 存于重传序列中, 直到发送窗口闭合停止发送 AMD PDU; c) Receiver RLC协议层接收 RLC AMD PDU, 如果正确接收, Receiver 向 Sender发送 ACK (确认应答) 状态才艮告 ( ACK STATUS REPORT ), 否则 发送 NACK (否认回答 ) ( NACK STATUS REPORT ); d) Sender接收 Receiver的状态报告,根据状态报告的类型,如果为 ACK, 则将重传序列中的相应的 RLC PDU删除, 更新发送窗口, 如果为 NACK, 则 重新发送相应的 RLC PDU, 重新发送的 RLC PDU的优先级高于第一次发送的 RLC PDU。
Sender发送 AMD PDU个数受 TFC (传输格式) 控制, 因此, 发送的有 效速率受重传的 AMD PDU的个数限制, 当重传的 AMD PDU数量上升时, 就 会导致有效的数据发送速率下降。 根据 3GPP TS 25.322协议, Receiver进行状态报告 ( STATUS REPORT )
] 由三种情况触发: a)当收到的 AMD PDU中的 Polling bit位为 1 b)当检测到有 AMD PDU丟失 c)当 Timer— Status— Periodic定时器超时 以 上条件只要具备其 中 之一, 并且状态 #艮告禁止定时器
Timer— Status_Prohibit处于无效或者超时状态, Receiver就会向 Sender发送状 态报告, Sender根据状态 ^告确定下个调度周期内发送 AMD PDU的总量(包 括重传的 AMD PDU )。 在实际应用中,对于高速业务,由于 RLC AM模式的最大发送窗口为 4096 的限制, 为避免发送窗口的闭合, 通常要求 Receiver 及时的向 Sender 发送 STATUS REPORT, 使得 Sender能够及时的更新滑动窗口, 保证业务数据的正 常传送。 假设业务速率为 V, AMD PDU的有效数据净荷为 b, 发送窗口为 W。 那么, 对于发送窗口来说, 收到第一个 STATUS的最迟的时间为 Wb/V , 因此, 如果业务速率越大, 要求的时间间隔就越短。 相应的, 对于 Receiver来说, 当 接收到第一个 AMD PDU后, 最迟要在 Wb/V - T时间间隔后发出 STATUS REPORT, 其中 T为网络环回延迟。 以 Τ为 100ms计算 (比较优的 LC AM模式下的网络环回延迟), 设 W 为 4096 (最大窗口), b = 320bit ( 3 GPP 4 荐的 RLC PDU净荷 ), 业务速率为 7Mbps, 那么, 就要求 Receiver最迟在 80ms后, 就要发送 STATUS REPORT 给 Sender, 以保证发送窗口不闭合, 设这个值为 R。 否则 Sender在 180ms后, 由于发送窗口闭合, 会导致数据发送量为 0。 假设 Sender在 tl时刻收到了 A PDU的 NACK状态^ =艮告, 重发 A PDU。 对于 Sender, 此次重发的状态报告要在 180ms后才能收到, 而对于 Receiver, 最迟 80ms后又要向 Sender进行状态报告,并且仍旧会将 A PDU报告给 Sender, 通知 Sender A PDU丢失,状态报告将在 Sender重发 A PDU后 130ms就接收到 (假设 Sender到 Receiver ό 网络延迟与 Receiver到 Sender的网络延迟 目等 λ 那么, 对于 Sender来说, 就对 A PDU进行了不必要的重传处理, 浪费了传输 带宽。 在通常情况下, AMD PDU的 Polling bit间隔最大为 128个 pdu, 当 tti = 10ms, rlc pdu size = 320时, 业务速率为 4M时, 每隔 10ms , Sender就会通过 设置 AMD PDU中的 Polling bit位,来触发一次 Receiver的状态 4艮告( STATUS REPORT ), 而 Receiver 的状态报告禁止定时器一般设置 20ms , 以网络时延 100ms计算, 至少为网络误码率的 6倍。 发明内容 本发明所要解决的技术问题是提供一种确认模式下无线链路控制协议的 控制数据单元的重传方法, 解决在高速率业务中现有技术的重传资源的浪费问 题。 为达到上述目的,本发明提供了一种确认模式下无线链路控制协议的控制 数据单元的重传方法, 其特点在于, 包括: 在控制数据单元中添加状态变量, 在每次发送控制数据单元的过程中将所述状态变量都打上***时间标签; 如果 收到所述控制数据单元的否认回答, 则计算当前***时间与所述时间标签的差 值, 通过所述差值进行所述控制数据单元的重发控制, 降低重发频率。 上述的方法, 其特点在于,通过所述差值进行所述控制数据单元的重发控 制, 包括: 判断所述差值是否大于门限值, 是则重发所述控制数据单元, 否则 放弃重发。 上述的方法, 其特点在于, 进一步包括如下步骤: 步骤一, 无线链路控制协议层的发送器接收来自高层的控制数据单元; 步驟二, 所述发送器在所述控制数据单元中添加状态变量, 并将所述状态 变量打上***时间标签; 步驟三,所述发送器将所述控制数据单元发往无线链路控制协议层的接收 器, 并且将所述控制数据单元存入重传序列; 步骤四, 所述发送器接收来自所述接收器的状态报告, 如果所述状态 艮告 为所述控制数据单元的否认回答, 则计算当前***时间与所述时间标签的差 值; 步骤五, 判断所述差值是否大于门卩艮值,是则更新所述控制数据单元的系 统时间标签并转到步骤三以重发所述控制数据单元, 否则放弃重发。 上述的方法, 其特点在于, 所述门限值是根据无线链路控制协议中的状态 报告间隔 t和网络环回延迟 T来设定。 上述的方法, 其特点在于, 如果 t > T, 则设置所述门限值为 -1 , 并且在 所述步骤五中还包括:如果所迷门限值为 -1则退出处理流程的步骤;如果 t < τ, 则设置所述门限值为 Χ%Τ,其中参数 X为根据实际应用配置的值。 上述的方法, 其特点在于, 所述参数 X为 80。 上述的方法, 其特点在于, 所述步驟四中还包括: 果所述状态 ^艮告为所 述控制数据单元的确认回答, 则 4 据正确接收的所述控制数据单元的序列号, 更新发送窗口, 保证发送窗口不发生闭合。 上述的方法, 其特点在于, 所述步驟二中还包括: 所述发送器根据当前发 送窗口的状况以及***传输格式, 确定当前能够发送的控制数据单元的个数。 本发明的技术效果在于: 本发明采用将重传队列中的 PDU打上时间戳方法, 在需要重传时, 计算 当前时刻与 PDU 的时间崔 的差值, 当差值的门限大于某个门限时, 才进行重 传, 否则放弃重传来降低网络多余重传开销。 采用本发明所述的方法, 能有效 解决 WCDMA***中, 采用 RLC AM模式的高速业务 RLC PDU重传资源浪 费的问题, 可以有效的提高带宽利用率, 节省***资源。 附图说明 图 1 是 0八]\1模式十办议构架示意图; 图 2 是本发明提供的 RLC AM模式重传方法流程图。 具体实施方式 下面结合附图对技术方案的实施作进一步的详细描述: 本发明方法主要是, 添加 RLC 状态变量( RLC State Variable ) VT(TAG), 当 AMD PDU被发送时 (包括重发), 将 VT(TAG)打上***时间标签。 如果收 到这个 PDU的 NACK, 那么计算当前***时间与时间标签 VT(TAG)的差值, 如果差值大于门限 TimeThreshold, 那么重发这个 AMD PDU, 并且更新状态变 量 VT(TAG), 否则放弃重发。 通过这种方式来降低 AMD PDU的重发频率, 提 高***资源和带宽利用率。 对于门限 TimeThreshold的设置,与 RLC AM协议中的 Status Report间隔 网络环回延迟有关。其中 Status Report间隔于协议中的 Polling相关参数及方式 和 Status Report相关参数有关。假设 Status Report间隔为 t ,网络环回延迟为 Τ , 那么可以采用如下设置策略:
^口果 t > Τ, 即 Status Report 间隔时间大于网络环回延迟, 那么设置 TimeThreshold为 -1 ,表明在数据发送和接收的处理中,不进行本方案的处理(也 就是说, 如果状态报告间隔大于网络环回延迟, 那么, 不进行本发明进行的相 关处理, 即在重传丟失的 PDU 时, 需要判断上一次重传和这次重传的时间间 隔于门限的比值); 如果 t < T , 即 Status Report 间隔时间小于网络环回延迟, 那么设置 TimeThreshold = T* 80%, 其中, 百分比为一个可以配置的值, 以在实际应用中 灵活掌握。 图 2 是本发明提供的 RLC AM模式重传方法流程图, 如图所示, 本发明 方法包括如下步據: 步骤 201: Sender RLC协议层接收高层的 RLC AMD PDU (编号为 a ); 步骤 202: Sender向 Receiver发送 RLC AMD PDU, 并且将其存入重传序 列; 步骤 203: 将更新当前发送的 AMD PDU的状态变量 VT(TAG); 步骤 204: 判断 Sender是否接收到 Receiver发送来的状态报告 ( Status Report ), 是则执行步骤 205 , 否则返回步 204; 步 205: 判断是否为 NACK, 是则执行步骤 206, 否则返回步骤 201 ; 步骤 206: 据状态 4艮告内容,得知需要重新编号为 a的 AMD PDU; Sender 判断是否 SystemTime - VT(TAG) > TimeThreshold, 是则跳转步骤 201 , Sender 重新发送 a号 AMD PDU, 更新状态变量 VT(TAG)的值; 否则跳转步骤 204以 等待接收下一个状态 4艮告。 本发明方法还可以细分成如下步骤: l)Sender AM RLC实体接收从高层发送的 RLC SDU
2)根据***参数设置, AM RLC实体将 RLC SDU进行分割或者级联, 构 建 LC AMD PDU 3)根据当前发送窗口的状况以及***传输格式,确定当前能够发送的 PDU 的个数
4)将重传的 PDU的状态变量 VT(TAG)打上***时间标签
5)将 PDUs发送给 Receiver, 并且将所发送的 AMD PDUs存入重传序列
6) Receiver接收到 Sender发送的 PDU后,根据状态报告***参数的设置, 向 Sender发送 Status Report
7) Sender接收到 Receiver后, 据正确接收的 PDU的序列号 ( Sequence Number ), 更新发送窗口, 保证发送窗口不发生闭合的情况
8)针对重传队列中的没有被正确接收的 AMD PDUs ( NAC ), Sender计 算 SystemTime - VT(TAG), 其中 SystemTime 为***当前时间, VT(TAG)为 AMD PDU发送时打上的时间标签
9)如果 SystemTime - VT(TAG) > TimeThreshold, 那么重传当前 PDU, 否 则, 对 Status Report中的 NACK不予响应, 其中, TimeThreshold为时间门限 , 设置与网络时延、 RLC AM模式下的 Polling和 Status相关参数的设置有关 设置网络上行延迟 80ms ,下行延迟 60ms, Status Report报告间隔为 20ms, 在第 46个 TTI ( TTI = 10ms ) 时, 接收方接收到 Sequence Number为 113的错 误 RLC AMD PDU。 发送 Status Report通知接收方此 PDU丟失。 接收方在第 54 TTI时接收到这个状态报告, 重传第 113号 RLC AMD PDU , 由于状态报告 间隔为 20ms , 因此, 从第 46个 TTI开始, 48、 50、 52、 54、 56、 58 TTI都会 发送状态报告, 在第 60 TTI的时候, 接收方收到了发送方在 54 TTI时重传的 113号 AMD PDU, 在状态报告中就通知发送方不用重传 113号 AMD PDU。 发送方在 56、 58、 60、 62、 64、 66 TTI会接收到丟失 1 13号 AMD PDU的状 态报告, 进行重传。 在第 68 TTI时接收方才会收到发送方在 60 TTI时发送的 113号 PDU的 ACK, 不进 4亍重传。 因此, 发送方在第 68 TTI时不再重传 113 号 AMD PDIL 对于发送方来说, 在 56至 66 TTI时对 113号 AMD PDU进行 重传都是重复的, 浪费了***带宽。 综上所述, 本方法通过设置 AMD PDU时间标签的方法, 可以有效解决 WCDMA 高速率业务中, 由于重传所造成的资源浪费和降低带宽利用率的问 题。 以上所述仅为本发明的较佳实施例, 并非用来限定本发明的实施范围; 凡 是依本发明所作的等效变化与修改, 都被本发明的专利范围所涵盖。

Claims

权 利 要 求 书
1、 一种确认模式下无线链路控制协议的控制数据单元的重传方法, 其特征 在于, 包括: 在控制数据单元中添加状态变量, 在每次发送控制数据单 元的过程中将所述状态变量都打上***时间标签; 如果收到所述控制数 据单元的否认回答, 则计算当前***时间与所述时间标签的差值, 通过 所述差值进行所述控制数据单元的重发控制, 降低重发频率。
2、 根据权利要求 1 所述的方法, 其特征在于, 通过所述差值进行所述控制 数据单元的重发控制, 包括: 判断所述差值是否大于门限值, 是则重发 所述控制数据单元, 否则放弃重发。
3、 根据权利要求 2所述的方法, 其特征在于, 进一步包括如下步骤: 步骤一,无线链路控制协议层的发送器接收来自高层的控制数据单 元;
步骤二, 所述发送器在所述控制数据单元中添加状态变量, 并将所 述状态变量打上***时间标签;
步骤三,所述发送器将所述控制数据单元发往无线链路控制协议层 的接收器, 并且将所述控制数据单元存入重传序列;
步驟四, 所述发送器接收来自所述接收器的状态报告, 如果所述状 态报告为所述控制数据单元的否认回答, 则计算当前***时间与所述时 间标签的差值;
步骤五, 判断所述差值是否大于门限值, 是则更新所述控制数据单 元的***时间标签并转到步骤三以重发所述控制数据单元, 否则放弃重 发。
4、 根据权利要求 2或 3所述的方法, 其特征在于, 所述门限值是 居无线 链路控制协议中的状态报告间隔 t和网络环回延迟 T来设定。
5、 根据权利要求 4所述的方法, 其特征在于, 如果 t > T, 则设置所述门 限值为 -1 , 并且在所述步骤五中还包括: 如果所述门限值为- 1则退出处 理流程的步骤; 如果 t < T, 则设置所述门限值为 Χ%Τ,其中参数 X为根据实际应用 配置的值。 根据权利要求 5所述的方法, 其特征在于, 所述参数 X为 80。 根椐权利要求 3所述的方法, 其特征在于, 所述步骤四中还包括: 如果 所述状态 4艮告为所述控制数据单元的确认回答, 则 艮据正确接收的所述 控制数据单元的序列号, 更新发送窗口, 保证发送窗口不发生闭合。 根据权利要求 3所述的方法, 其特征在于, 所述步骤二中还包括: 所述 发送器根据当前发送窗口的状况以及***传输格式, 确定当前能够发送 的控制数据单元的个数。
PCT/CN2006/003680 2006-04-24 2006-12-29 Procédé de retransmission d'une unité de données de commande d'un protocole de commande à liaison sans fil en mode de reconnaissance WO2007121635A1 (fr)

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