WO2009039730A1 - Procédé pour déclencher un rapport d'état de requête de répétition automatique - Google Patents

Procédé pour déclencher un rapport d'état de requête de répétition automatique Download PDF

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Publication number
WO2009039730A1
WO2009039730A1 PCT/CN2008/071149 CN2008071149W WO2009039730A1 WO 2009039730 A1 WO2009039730 A1 WO 2009039730A1 CN 2008071149 W CN2008071149 W CN 2008071149W WO 2009039730 A1 WO2009039730 A1 WO 2009039730A1
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Prior art keywords
timer
radio link
link control
data unit
layer protocol
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PCT/CN2008/071149
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English (en)
French (fr)
Inventor
Jian Zhang
Original Assignee
Zte Corporation
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Application filed by Zte Corporation filed Critical Zte Corporation
Priority to JP2010525185A priority Critical patent/JP5432904B2/ja
Priority to US12/674,830 priority patent/US8989059B2/en
Priority to EP08757560.1A priority patent/EP2175582B2/en
Publication of WO2009039730A1 publication Critical patent/WO2009039730A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1848—Time-out mechanisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1854—Scheduling and prioritising arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements 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
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1848—Time-out mechanisms
    • H04L1/1851—Time-out mechanisms using multiple timers

Definitions

  • the present invention relates to the field of digital mobile communication technologies, and in particular, to a method for triggering a status report of an acknowledgment mode radio link control AM RLC entity automatic retransmission request ARQ in a wireless communication system.
  • Radio link control AM RLC entity automatic retransmission request ARQ receiver response status reporting mechanism is: periodic, radio link control layer protocol data unit (RLC PDU) loss detection, receiving and transmitting The polling message of the end polling three triggering modes.
  • the status report contains an acknowledgment message ACK or a non-acknowledgement message NACK.
  • the packet format has three types: bitmap (BITMAP), list (LIST), and relative list (RLIST). There are two mechanisms for reducing the frequency of reporting, such as prohibiting polling and prohibiting periodic polling.
  • the radio link control AM RLC entity automatic retransmission request trigger mechanism of the ARQ receiver response status report the current 3GPP conclusion is that the status report is triggered when the polling detection message Polling of the transmitting end is received.
  • Other trigger mechanisms are still in the process of discussion.
  • the existing discussion solution includes a receiving gap gap detection mechanism, that is, when the receiving end detects that the sequence number SN of the received RLC PDU has a gap, that is, a discontinuity, a timer is set for the RLC PDU corresponding to the SN at the gap, and the timing is set. The status report is triggered after the timer expires.
  • the RNC PDU with the SN of 1, 2, 5, and 6 is received by the receiving end, indicating that the RLC PDU with the SN of 3, 4 in the gap has not yet reached the receiving end, and a timer is set for the RLC PDUs with the SN of 3 and 4 respectively. After the timer expires, if the RLC PDUs with SNs 3 and 4 are not received, the status report is respectively fed back, including the non-acknowledgment information NACK of the RLC PDUs with the SNs 3 and 4, that is, the NACK information is reported as the NACK information in the status report.
  • the serial number 3, 4 of the missing RLC PDU is described in the status report.
  • the main purpose of the timer is to avoid false alarming of the NACK status report.
  • the delay may occur due to the HARQ retransmission, or the AM RLC of the sender may be directly notified after the maximum allowable number of HARQ retransmission failures of the hybrid automatic repeat request entity on the transmitting end.
  • the entity retransmits the RLC PDU. If the AM RLC entity at the receiving end detects the gap, it may be able to receive the RLC PDU retransmitted by the transmitting end. In this case, the receiver AM RLC entity should not ring immediately when it detects the gap.
  • the NACK status report is required, but the timer needs to be set to wait for a certain period of time. When the timer does not receive the RLC PDU corresponding to the SN at the gap, the status report is returned.
  • the disadvantage of this solution is that a timer is set for each RLC PDU corresponding to the SN at the gap. After the timer expires, the status report is respectively reported. Multiple messages occupy more radio resources and the efficiency is not high.
  • the HARQ uses multiple parallel processes. In general, when the radio link is in a bad situation, multiple HARQ processes may fail to retransmit. Therefore, the receiver RMC entity may detect the RLC PDU in a short time. To several consecutive or intermittent gaps.
  • the AM RLC entity at the receiving end may receive the RLC PDU corresponding to the SN at the above gap in a short time, and therefore, for the SN at the gap SN Setting a timer for each of the corresponding RLC PDUs causes a waste of resources.
  • the technical problem to be solved by the present invention is to improve the shortcomings of separately setting a timer for each RLC PDU corresponding to the SN at the gap gap in the existing solution, and provide an acknowledge mode radio link control AM RLC entity ARQ status report. Trigger method.
  • the present invention provides an automatic retransmission request status report triggering method, where the receiving end acknowledges that the mode radio link control entity detects that the received radio link control layer protocol data unit is missing, and sets a timer. T1, when the new radio link control layer protocol data unit is detected to be missing when the timer T1 is running, a new timer T1 is not set.
  • the foregoing method may further have the following feature: when the timer T1 times out, the receiving end confirms that the mode radio link control entity triggers a status report.
  • the foregoing method may further have the following feature: the receiving end confirming mode radio link control entity determines the radio link control layer protocol by detecting whether a sequence number of the radio link control layer protocol data unit has a gap Whether the data unit is missing; the radio link control layer protocol data unit is missing, and the radio link control layer protocol data unit detected before the setting of the timer T1 is deleted and newly detected after the timer T1 is set. The radio link control layer protocol data unit is missing. Further, the foregoing method may further have the following feature: when the timer T1 is running, if the receiving end confirms that the mode radio link control entity receives all radio link control layer protocols that are missing before the timer T1 is set The data unit stops the timer T1.
  • the foregoing method may further have the following feature, where the status includes a radio link control layer protocol data unit that is missing before the timer T1 is timed out and is set before the timer T1 is set. Serial number.
  • the present invention also provides another automatic retransmission request status report triggering method.
  • the receiving end acknowledges that the mode radio link control entity detects that the received radio link control layer protocol data unit is missing, the timer T1 and the time are set.
  • the threshold t2 when a new radio link control layer protocol data unit is detected to be missing before the time threshold t2, does not set a new timer T1.
  • the foregoing method may further have the following feature: when the timer T1 times out, the receiving end confirms that the mode radio link control entity triggers a status report.
  • the above method may further have the following feature, the length of the time threshold t2 being set to be not longer than the timing length of the timer T1.
  • the receiving end confirming mode radio link control entity determines the radio link control layer protocol by detecting whether a sequence number of the radio link control layer protocol data unit has a gap Whether the data unit is missing; the radio link control layer protocol data unit is missing, and the radio link control layer protocol data unit detected before the setting of the timer T1 is deleted and newly detected after the timer T1 is set. The radio link control layer protocol data unit is missing.
  • the foregoing method may further have the following feature: when the timer T1 is running, if the receiving end confirms that the mode radio link control entity receives all radio link control layer protocols that are missing before the timer T1 is set The data unit stops the timer T1; after the timer T1 is stopped, if it is detected again that the radio link control layer protocol data unit is missing, a new timer T1 and a time threshold t2 are set.
  • the foregoing method may further have the following feature, where the status includes a sequence of radio link control layer protocol data units that are missing before the timer T1 is received before the timer T1 is timed out. number. Further, the above method may further have the following feature: when the new radio link control layer protocol data unit is detected to be missing after the time threshold t2, a new timer T1 and a time threshold t2 are set.
  • the invention effectively reduces the number of timers required for the AR RLC entity ARQ trigger status report, the number of messages required for the feedback status report, and the data volume of the message packet, thereby improving the radio resource utilization and system performance.
  • FIG. 1 is a flow chart of a method for triggering an AR RLC entity ARQ status report at a receiving end according to Embodiment 1 of the present invention
  • FIG. 2 is a flow chart of a method for triggering an AR RLC entity ARQ status report at the receiving end according to Embodiment 2 of the present invention.
  • Preferred embodiment of the invention
  • the core idea of the present invention is: for the receiving end AM RLC entity gap detection (Gap detection, or PDU detection, detection of missing PDU (s)) status report trigger mechanism, if the timer has been activated, no additional timer is started . That is, only one timer is active at a given time.
  • the main steps of the invention are:
  • Step 1 The receiving end AM RLC entity receives the RLC PDU
  • Step 2 The receiving end AM RLC entity sets a timer T1 if the RLC PDU sequence number SN gap is detected.
  • T1 When the timer T1 is running, if a new RLC PDU sequence number SN gap is detected, there is no need for the new sequence number SN. Set a new timer in the gap;
  • the receiving end AM RLC entity detects the RLC PDU sequence number SN gap
  • the timer T1 and a time threshold t2 are set; before the time threshold t2, if a new RLC PDU sequence number SN gap is detected, there is no need to target
  • the new serial number SN gap is further set with a timer T1;
  • Step 3 When the timer T1 is running, if the receiving terminal AM RLC entity receives the RLC PDU corresponding to all the sequence number SN gaps before the timer T1 is set, the timer T1 is stopped; After T1 is stopped, if the radio link control layer protocol data unit SN gap is detected again, a new timer T1 is set, or T1 of the new timer and time threshold t2 are set;
  • Step 4 When the timer T1 times out, the status is triggered.
  • the status report fed back by the receiving end AM RLC entity includes the sequence number SN gap of one or more RLC PDUs before the timer T1 is set before the timer T1 is timed out.
  • step 2 the length of the time threshold t2 is set to be no longer than the length of the timer T1.
  • step three if timer T1 is stopped, it will not time out. If the receiver R1 entity has not received the RLC PDU corresponding to one or more SN gaps before the timer T1 before the timer T1 times out, the timer T1 will not be stopped, resulting in a timeout.
  • the sequence number of the RLC PDU received by the AM RLC entity is contiguous.
  • the sequence number SN gap refers to those SNs that are missing from the SN discontinuity.
  • the receiving end AM RLC entity will normally receive the RLC PDU whose sequence number SN is 1, 2, 3, 4, 5, 6. If the RLC PDUs of 1, 2, 5, 6 are actually received, then 3 4 is the serial number SN gap.
  • FIG. 1 is a flowchart of a triggering method for an AM RLC entity ARQ state 4 advertisement of a receiving end according to Embodiment 1 of the present invention, and the specific steps are as follows:
  • Step 110 The receiving end AM RLC entity receives the RLC PDU.
  • Step 120 the receiving end AM RLC entity determines whether the SN gap is detected, and if yes, go to step 130, otherwise go to step 110;
  • Step 130 Set a timer T1, and the T1 runtime (ie, the activation time) does not set a new timer T1 for the newly detected SN gap;
  • Step 140 it is determined whether the R1 PDU corresponding to all the SN gaps before the timer T1 is received during the T1 operation, if yes, go to step 150, otherwise go to step 160; Step 150, stop the timer Tl, go to step 110;
  • Step 160 The T1 times out, and feeds back the status report to the transmitting terminal AM RLC entity, including the sequence number SN gap of the first or more RLC PDUs that have not been received before the timeout of the timer T1, and the process proceeds to step 110.
  • timer T1 After timer T1 is stopped or timer T1 times out feedback status, if it is in timer
  • the ARQ receiver maintains the receiving window and the associated receiving state variable and updates it in real time according to the actual receiving situation. If the state variable corresponding to the lower edge of the receiving window is smaller than the next highest RLC PDU sequence number currently received. The serial number indicates that the RLC PDU sequence number gap still exists.
  • FIG. 2 is a flowchart of a receiving end AM RLC entity status report triggering method according to Embodiment 2 of the present invention, and the specific steps are as follows:
  • Step 210 The receiving end AM RLC entity receives the RLC PDU.
  • Step 220 the receiving end AM RLC entity determines whether the SN gap is detected, if yes, go to step 230, otherwise go to step 210;
  • Step 230 setting a timer T1 and a time threshold t2, and setting a new timer for the newly detected SN gap before the time threshold t2;
  • a new timer is set even if the timer T1 has not expired.
  • Step 240 it is determined whether the R1 PDU corresponding to all the SN gaps before the timer T1 is received during the T1 operation, if yes, go to step 250, otherwise go to step 260;
  • Step 250 stop the timer T1, go to step 210;
  • Step 260 T1 times out, and returns a status report to the transmitting terminal AM RLC entity, including the sequence number SN gap of the first or more RLC PDUs that have not been received before the timer T1 times out, and then proceeds to step 210.
  • the method of the invention is applied to the status report triggering of the AM RLC entity automatic retransmission request ARQ in the wireless communication system, reducing the number of timers required for the receiving end AM RLC entity ARQ trigger status report, the number of messages required for the feedback status report, and the message
  • the amount of data in the packet improves wireless resource utilization and system performance.

Description

一种自动重传请求状态报告触发方法
技术领域
本发明涉及数字移动通信技术领域， 特别涉及无线通信系统中确认模式 无线链路控制 AM RLC实体自动重传请求 ARQ的状态报告触发方法。
背景技术
第三代移动通信系统的确认模式无线链路控制 AM RLC实体自动重传请 求 ARQ接收端响应状态报告机制为： 周期性、无线链路控制层协议数据单元 ( RLC PDU )丟失检测、接收到发送端的轮流检测消息 Polling三种触发方式。 状态报告中包含确认消息 ACK或非确认消息 NACK, 数据包格式有位图 ( BITMAP ) 、 列表（LIST ) 、 相对列表（RLIST )三种。 有禁止轮流检测、 禁止周期性轮流检测两种降低状态报告频率的机制。
关于第三代移通信长期演进系统的确认模式无线链路控制 AM RLC实体 自动重传请求 ARQ接收端响应状态报告的触发机制， 当前 3GPP的结论是接 收到发送端的轮流检测消息 Polling时触发状态报告， 其它触发机制还处于讨 论过程中。 现有讨论方案中包括接收端间隙 gap检测机制， 即接收端检测到 所接收到的 RLC PDU的序列号 SN有间隙即不连续的情况下针对间隙处 SN 所对应的 RLC PDU设置定时器，定时器超时后触发状态报告。例如接收端接 收到了 SN为 1、 2、 5、 6的 RLC PDU, 说明间隙处 SN为 3、 4的 RLC PDU 还没有到达接收端， 则针对 SN为 3、 4的 RLC PDU分别设置定时器， 定时 器超时后如果还没有收到 SN为 3、 4的 RLC PDU则分别反馈状态报告， 包 括上述 SN为 3、 4的 RLC PDU的非确认信息 NACK, 即状态报告中反馈为 NACK信息的分别为所缺失的 RLC PDU的序列号 3、 4。
釆用定时器的主要目的是为了避免误报 NACK状态报告，由于 HARQ重 传可能产生的延迟， 或者在发送端的混合自动重传请求实体 HARQ重传失败 最大允许次数后将直接通知发送端的 AM RLC实体重发 RLC PDU, 在接收 端的 AM RLC实体检测到 gap的情况下也可能接着就能够收到发送端重传过 来的 RLC PDU。这种情况下接收端 AM RLC实体检测到 gap时不应该马上响 应 NACK状态报告， 而是需要设置定时器等待一定的时间， 定时器超时后确 实未收到 gap处 SN所对应的 RLC PDU时再反馈状态报告。
该方案的缺点是需要针对 gap处 SN所对应的每一个 RLC PDU分别设置 定时器， 定时器超时后分别反馈状态报告， 多个消息占用较多无线资源且效 率不高。 HARQ釆用多道并行进程， 一般情况下在无线链路状况较差的场景 时， 可能导致多个 HARQ进程重传失败， 从而在接收端 AM RLC实体接收 RLC PDU时可能在较短时间内检测到连续的或间断的若干个 gap。 这种情况 下如果发送端的 HARQ已经通知 AM RLC实体进行了重传，则接收端的 AM RLC实体可能在较短时间内就接收到上述 gap处 SN所对应的 RLC PDU, 因 此， 针对 gap处 SN所对应的每一个 RLC PDU分别设置定时器造成了资源的 浪费。
发明内容
本发明要解决的技术问题是针对现有方案中需要对间隙 gap处 SN所对 应的每个 RLC PDU分别设置定时器的缺点进行改进,提供一种确认模式无线 链路控制 AM RLC实体 ARQ状态报告触发方法。
为了解决上述技术问题， 本发明提供了一种自动重传请求状态报告触发 方法， 接收端确认模式无线链路控制实体检测到所接收到的无线链路控制层 协议数据单元缺失时， 设置定时器 T1 , 在所述定时器 T1运行时检测到新的 无线链路控制层协议数据单元缺失时， 不设置新的定时器 Tl。
进一步地， 上述方法还可具有以下特点， 在所述定时器 T1超时时， 所述 接收端确认模式无线链路控制实体触发状态报告。
进一步地， 上述方法还可具有以下特点， 所述接收端确认模式无线链路 控制实体通过检测所述无线链路控制层协议数据单元的序列号是否存在间 隙， 判断所述无线链路控制层协议数据单元是否缺失； 所述无线链路控制层 协议数据单元缺失分为设置所述定时器 T1 前所检测到的无线链路控制层协 议数据单元缺失和设置所述定时器 T1 后新检测到的无线链路控制层协议数 据单元缺失。 进一步地， 上述方法还可具有以下特点， 在所述定时器 T1运行时， 如果 所述接收端确认模式无线链路控制实体接收到设置所述定时器 T1 前缺失的 所有无线链路控制层协议数据单元， 则停止所述定时器 Tl。
进一步地， 上述方法还可具有以下特点， 所述状态^艮告中包含在所述定 时器 T1超时前仍未接收到的设置所述定时器 T1前所缺失的无线链路控制层 协议数据单元的序列号。
本发明还提供了另一种自动重传请求状态报告触发方法， 接收端确认模 式无线链路控制实体检测到所接收到的无线链路控制层协议数据单元缺失 时， 设置定时器 T1和一时间阔值 t2, 在所述时间阔值 t2前检测到新的无线 链路控制层协议数据单元缺失时， 不设置新的定时器 Tl。
进一步地， 上述方法还可具有以下特点， 在所述定时器 T1超时时， 所述 接收端确认模式无线链路控制实体触发状态报告。
进一步地， 上述方法还可具有以下特点， 所述时间阔值 t2的长度设置为 不大于所述定时器 T1的定时长度。
进一步地， 上述方法还可具有以下特点， 所述接收端确认模式无线链路 控制实体通过检测所述无线链路控制层协议数据单元的序列号是否存在间 隙， 判断所述无线链路控制层协议数据单元是否缺失； 所述无线链路控制层 协议数据单元缺失分为设置所述定时器 T1 前所检测到的无线链路控制层协 议数据单元缺失和设置所述定时器 T1 后新检测到的无线链路控制层协议数 据单元缺失。
进一步地， 上述方法还可具有以下特点， 在所述定时器 T1运行时， 如果 所述接收端确认模式无线链路控制实体接收到设置所述定时器 T1 前缺失的 所有无线链路控制层协议数据单元，则停止所述定时器 T1 ;在所述定时器 T1 停止后， 如果再次检测到无线链路控制层协议数据单元缺失时， 设置新的定 时器 T1和时间阔值 t2。
进一步地， 上述方法还可具有以下特点， 所述状态^艮告中包含在定时器 T1超时前仍未接收到的设置所述定时器 T1前所缺失的无线链路控制层协议 数据单元的序列号。 进一步地， 上述方法还可具有以下特点， 在所述时间阔值 t2后检测到新 的无线链路控制层协议数据单元缺失时， 设置新的定时器 T1和时间阔值 t2。
本发明有效减少了接收端 AM RLC实体 ARQ触发状态报告所需的定时 器数量、 反馈状态报告所需的消息数量和消息包的数据量， 提高了无线资源 利用率和系统性能。 附图概述
图 1 是本发明实施例 1接收端 AM RLC实体 ARQ状态报告触发方法流 程图；
图 2 是本发明实施例 2接收端 AM RLC实体 ARQ状态报告触发方法流 程图。 本发明的较佳实施方式
本发明的核心思想为：对于接收端 AM RLC实体间隙检测（ gap detection, 或丟失 PDU检测， Detection of missing PDU(s) )状态报告触发机制， 如果定 时器已经激活， 则不启动额外的定时器。 即在给定时间内， 仅有一个定时器 处于激活状态。
本发明的主要步骤为：
步骤一： 接收端 AM RLC实体接收 RLC PDU;
步骤二： 接收端 AM RLC实体如果检测到 RLC PDU序列号 SN间隙， 则设置定时器 T1 ; 在定时器 T1运行时， 如果检测到新的 RLC PDU序列号 SN间隙， 无需针对该新序列号 SN间隙再设置新的定时器；
或者， 接收端 AM RLC实体如果检测到 RLC PDU序列号 SN间隙， 则 设置定时器 T1和一时间阔值 t2;在时间阔值 t2前，如果检测到新的 RLC PDU 序列号 SN间隙， 无需针对该新序列号 SN间隙再设置定时器 T1 ;
步骤三： 定时器 T1运行时， 如果接收端 AM RLC实体收到了设置定时 器 T1前所有序列号 SN间隙所对应的 RLC PDU, 则停止定时器 T1 ; 定时器 Tl被停止后如果再次检测到无线链路控制层协议数据单元 SN间隙， 设置新 的定时器 T1 , 或设置新定时器的 T1和时间阔值 t2;
步骤四： 定时器 T1超时， 则触发状态 ^艮告。
接收端 AM RLC实体所反馈的状态报告包括定时器 T1超时前还没有接 收到的设置定时器 T1前 1个或多个 RLC PDU的序列号 SN间隙。
说明 1 :在步骤二中，时间阔值 t2的长度设置为不大于定时器 T1的长度。 说明 2: 在步骤三中， 如果定时器 T1被停止， 则不会超时。 如果定时器 T1超时前，接收端 AM RLC实体还没有收到设置定时器 T1前 1个或多个 SN 间隙所对应的 RLC PDU, 则定时器 T1不会被停止， 从而导致超时。
说明 3: 正常情况下接收端 AM RLC实体所接收到的 RLC PDU的序列 号 SN是连续的， 序列号 SN间隙指导致 SN不连续现象所缺失的那些 SN。 例如， 正常情况下接收端 AM RLC实体将收到序列号 SN为 1、 2、 3、 4、 5、 6的 RLC PDU, 如果实际上收到了 1、 2、 5、 6的 RLC PDU, 则 3、 4为序列 号 SN间隙。
下面结合附图和具体实施例对本发明作进一步详细描述。
图 1描述了本发明实施例 1的一种接收端 AM RLC实体 ARQ状态 4艮告 触发方法的流程， 具体步骤如下：
步骤 110, 接收端 AM RLC实体接收 RLC PDU;
步骤 120, 接收端 AM RLC实体判断是否检测到 SN间隙， 如果是， 转 步骤 130, 否则转步骤 110;
步骤 130, 设置定时器 Tl , T1运行时 (即激活时间内）对于新检测到的 SN间隙不设新的定时器 T1 ;
步骤 140,判断 T1运行时是否收到设置定时器 T1前所有 SN间隙所对应 的 RLC PDU, 如果是， 转步骤 150, 否则转步骤 160; 步骤 150, 停止定时器 Tl , 转步骤 110;
步骤 160, T1超时， 向发送端 AM RLC实体反馈状态报告， 包括在定时 器 T1超时前还没有接收到的设置定时器 T1前 1个或多个 RLC PDU的序列 号 SN间隙， 转步骤 110。
定时器 T1被停止后或者定时器 T1超时反馈状态 告后， 如果在定时器
T1运行期间所新检测到的 RLC PDU序列号 SN间隙仍然存在， 则再次设置 定时器 T1 , 依此类推。
在接收过程中， ARQ接收端维护接收窗口和相关的接收状态变量并根据 实际接收情况实时更新， 如果接收窗口下沿所对应的状态变量小于当前所接 收到的最高的 RLC PDU序列号的下一个序列号， 则说明 RLC PDU序列号间 隙仍然存在。
图 2说明了本发明实施例 2的一种接收端 AM RLC实体状态报告触发方 法的流程， 具体步骤如下：
步骤 210, 接收端 AM RLC实体接收 RLC PDU;
步骤 220, 接收端 AM RLC实体判断是否检测到 SN间隙， 如果是， 转 步骤 230, 否则转步骤 210;
步骤 230,设置定时器 T1和时间阔值 t2,在时间阔值 t2前对于新检测到 的 SN间隙不设新的定时器；
其中，在时间阔值 t2后如果检测到新的 SN间隙时， 即使定时器 T1还未 超时， 也要设置新的定时器。
步骤 240,判断 T1运行时是否收到设置定时器 T1前所有 SN间隙所对应 的 RLC PDU, 如果是， 转步骤 250, 否则转步骤 260;
步骤 250, 停止定时器 T1 , 转步骤 210;
步骤 260, T1超时， 向发送端 AM RLC实体反馈状态报告， 包括在定时 器 T1超时时还没有接收到的设置定时器 T1前 1个或多个 RLC PDU的序列 号 SN间隙， 转步骤 210。 工业实用性
本发明方法应用于无线通信系统中 AM RLC实体自动重传请求 ARQ的 状态报告触发， 减少了接收端 AM RLC实体 ARQ触发状态报告所需的定时 器数量、 反馈状态报告所需的消息数量和消息包的数据量， 提高了无线资源 利用率和系统性能。

Claims

权 利 要 求 书
1、 一种自动重传请求状态报告触发方法，接收端确认模式无线链路控制 实体检测到所接收到的无线链路控制层协议数据单元缺失时， 设置定时器 T1 , 在所述定时器 T1 运行时检测到新的无线链路控制层协议数据单元缺失 时， 不设置新的定时器 Tl。
2、 如权利要求 1所述的方法， 其特征在于， 在所述定时器 T1超时时， 所述接收端确认模式无线链路控制实体触发状态报告。
3、 如权利要求 2所述的方法，其特征在于， 所述接收端确认模式无线链 路控制实体通过检测所述无线链路控制层协议数据单元的序列号是否存在间 隙， 判断所述无线链路控制层协议数据单元是否缺失； 所述无线链路控制层 协议数据单元缺失分为设置所述定时器 T1 前所检测到的无线链路控制层协 议数据单元缺失和设置所述定时器 T1 后新检测到的无线链路控制层协议数 据单元缺失。
4、 如权利要求 1或 2所述的方法， 其特征在于， 在所述定时器 T1运行 时， 如果所述接收端确认模式无线链路控制实体接收到设置所述定时器 T1 前缺失的所有无线链路控制层协议数据单元， 则停止所述定时器 Tl。
5、 如权利要求 3所述的方法，其特征在于， 所述状态报告中包含在所述 定时器 T1超时前仍未接收到的设置所述定时器 T1前所缺失的无线链路控制 层协议数据单元的序列号。
6、 一种自动重传请求状态报告触发方法，接收端确认模式无线链路控制 实体检测到所接收到的无线链路控制层协议数据单元缺失时，设置定时器 T1 和一时间阔值 t2, 在所述时间阔值 t2前检测到新的无线链路控制层协议数据 单元缺失时， 不设置新的定时器 Tl。
7、 如权利要求 6所述的方法， 其特征在于， 在所述定时器 T1超时时， 所述接收端确认模式无线链路控制实体触发状态报告。
8、 如权利要求 6所述的方法， 其特征在于， 所述时间阔值 t2的长度设 置为不大于所述定时器 T1的定时长度。
9、 如权利要求 7所述的方法，其特征在于， 所述接收端确认模式无线链 路控制实体通过检测所述无线链路控制层协议数据单元的序列号是否存在间 隙， 判断所述无线链路控制层协议数据单元是否缺失； 所述无线链路控制层 协议数据单元缺失分为设置所述定时器 T1 前所检测到的无线链路控制层协 议数据单元缺失和设置所述定时器 T1 后新检测到的无线链路控制层协议数 据单元缺失。
10、 如权利要求 6或 7所述的方法，其特征在于，在所述定时器 T1运行 时， 如果所述接收端确认模式无线链路控制实体接收到设置所述定时器 T1 前缺失的所有无线链路控制层协议数据单元， 则停止所述定时器 T1 ; 在所述 定时器 T1停止后，如果再次检测到无线链路控制层协议数据单元缺失时，设 置新的定时器 T1和时间阔值 t2。
11、 如权利要求 9所述的方法， 其特征在于， 所述状态报告中包含在定 时器 T1超时前仍未接收到的设置所述定时器 T1前所缺失的无线链路控制层 协议数据单元的序列号。
12、 如权利要求 6所述的方法， 其特征在于， 在所述时间阔值 t2后检测 到新的无线链路控制层协议数据单元缺失时，设置新的定时器 T1和时间阔值 t2。
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