WO2011032384A1 - 一种状态报告触发方法及装置 - Google Patents
一种状态报告触发方法及装置 Download PDFInfo
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- WO2011032384A1 WO2011032384A1 PCT/CN2010/072111 CN2010072111W WO2011032384A1 WO 2011032384 A1 WO2011032384 A1 WO 2011032384A1 CN 2010072111 W CN2010072111 W CN 2010072111W WO 2011032384 A1 WO2011032384 A1 WO 2011032384A1
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- Prior art keywords
- status report
- window
- state
- status
- data receiving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/10—Scheduling measurement reports ; Arrangements for measurement reports
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- 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
- H04L1/1607—Details of the supervisory signal
- H04L1/1685—Details of the supervisory signal the supervisory signal being transmitted in response to a specific request, e.g. to a polling signal
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- 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
- H04L1/1809—Selective-repeat protocols
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- 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
- H04L1/1832—Details of sliding window management
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- 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
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- 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
- H04L1/1858—Transmission or retransmission of more than one copy of acknowledgement message
Definitions
- the present invention relates to the field of mobile communication technologies, and in particular, to a state report triggering method and apparatus in a wireless link control layer acknowledge mode protocol in a Long Term Evolution (LTE) system.
- LTE Long Term Evolution
- the Radio Link Control (RLC) protocol layer is a sublayer of Layer 2 (L2) in the radio interface protocol stack of LTE, located in the Media Access Control (MAC) layer and packet data aggregation. Protocol (PDCP, Packet Data Convergence Protocol) between layers.
- the functions of the RLC protocol layer include link control, encapsulation and reassembly, cascading, user data transmission, error correction, protocol error detection and repair, etc., providing segmentation and retransmission services for user and control data.
- Each RLC protocol entity is configured by the Radio Resource Control (RRC) layer and operates in three data transfer modes: transparent mode (TM, Transparent Mode), unacknowledged mode (UM, Unacknowledged Mode), and Confirm mode (AM, Acknowledged Mode).
- TM transparent mode
- UM Unacknowledged Mode
- AM Confirm mode
- ARQ Automatic Repeat Request
- ACK_SN message number
- FIG. 1 shows the architecture of the RLC in the acknowledge mode protocol.
- the current triggering process for the status report in the acknowledge mode involves two Timers are used at the data transmission receiving end of the RLC.
- the first is the reordering timer (t-Reordering).
- t-Reordering is used to detect the loss of the underlying data.
- the status report is sent to the sender.
- the status prohibition timer t-StatusProhibit
- t-StatusProhibit is used to limit the transmission frequency of the status report, that is, the transmission time of the two status reports must meet a certain time interval.
- the RLC sender triggers through polling. 2.
- the RLC receiver detects that the PDU has failed to receive (the reordering timer expires).
- the second mode related to the present invention will be mainly described.
- the RLC receiver detects that the packet does not arrive in sequence, it will immediately start the reordering timer t-Reordering.
- the t-reordering timer will trigger the VR (MS) update and status report transmission, VR. (MS) is used in the data receiving window to identify the cutoff position of the construction status report, that is, the value of the aforementioned ACK_SN, and the transmission of the status report must be triggered after the update of the VR (MS).
- the triggering of the status report is not unlimited and needs to meet a certain transmission interval.
- the Status Report is constructed and delivered to the lower layer when the first transmission timing indicated by the lower layer comes; otherwise, the transmission of the first lower layer indication after the t-StatusProhibit timer expires When the time comes, construct the Status Report and deliver it to the lower layer.
- the RLC AM entity receiving side will start the t-status_prohibit timer.
- the transmission of the message in the acknowledgment mode needs to be confirmed by the status report.
- the status report Since the hybrid automatic repeat request (HARQ) has a limit on the number of retransmissions of lost packets, the status report itself has no mechanism at the RLC layer to ensure certain reception, and the triggering of the two status reports must satisfy certain Interval. In this way, if the status report is lost at the bottom, that is, the retransmission of the message reported by the status is not successful, then it can only be achieved after the next trigger status report.
- HARQ hybrid automatic repeat request
- the upper level confirmation of the status report is necessary, mainly in the case that the receiving window is about to be full.
- the send window must have been stagnant. At this point, if the data receiver triggers the status report but is lost at the bottom, only Wait until the triggering of a new round of status report requires the sender to retransmit the corresponding PDU fragment.
- the triggering method of the status report is performed only once in the state of the data transmission window, and the status report is constructed only once, and the status report cannot be successfully sent to the data transmitting end, thereby failing to ensure that the status report can be triggered.
- a valid message retransmission may result in at least one state inhibit timer period, or a reorder timer period or a polling timer period, in order to release the window when the window is stalled due to being full.
- the state of stagnation causes the air interface data transmission to be delayed, and the air interface data transmission speed is low.
- the technical problem to be solved by the present invention is to provide a method and a device for triggering a status report in a wireless link control layer acknowledge mode protocol, which can ensure that the retransmission triggered by the status report is effective, thereby avoiding the stagnation of the window due to being full. In the case of air interface data transmission speed is lower.
- the method for triggering the status report of the present invention includes:
- Step A At the data receiving end of the radio link control layer, when the reordering timer expires, or when receiving the message of the polling bit transmitted from the transmitting end, construct a status report and send, and then perform step B;
- Step B determining whether the data receiving window is in a smooth moving state. If the data is in a smooth moving state, immediately after the status report is sent, the status prohibiting timer is started, and the status report triggers the retransmission success; if the data receiving window is successful; If it is not in a smooth moving state, perform step C;
- Step C detecting whether the retransmission triggered by the current status report is successful, if successful, starting the status prohibition timer; if not, performing step D;
- Step D Trigger the status report again, and return to step B.
- step B determining whether the data receiving window is in a smooth moving state includes:
- step C detecting whether the retransmission triggered by the current status report is successful includes:
- Step C Record the system frame number of the sending time of the current status report
- Step C2 The difference between the system frame number at the current time and the system frame number of the recorded state at the time of the transmission is equal to the number of system frames that are passed from the status report to the completion of the retransmission, and the data receiving window is judged. Whether the position of the trailing edge changes, if a change occurs, it is determined that the retransmission triggered by the current status report is successful; if no change occurs, it is determined that the retransmission triggered by the current status report is unsuccessful.
- the method further includes: when the reordering timer expires, or the receiving end receives the message of the next polling bit transmitted by the transmitting end, ending the triggering process of the current status report and transferring to the next state Processing of the report.
- the status report triggering apparatus of the present invention includes: a status report construction module, a window status detection module, a retransmission detection module, and a timer adjustment module;
- a status report constructing module configured to: when the reordering timer expires, or when the data receiving end of the radio link control layer receives the message of the polling bit sent by the transmitting end, construct a status report and send; the window status detecting module And detecting, after the status report constructing module sends the status report, whether the data receiving window of the radio link control layer is in a smooth moving state;
- a retransmission detecting module configured to: when the window state detecting module detects that the data receiving window is not in a smooth moving state, detecting whether the retransmission triggered by the status report sent by the status report constructing module is successful;
- a timer adjustment module configured to: when the window state detecting module detects that the data receiving window is in a smooth moving state, start a state prohibiting timer, and consider that the secondary state report triggers a retransmission success; when the retransmission detecting module detects When the retransmission triggered by this status report is successful, the start status prohibit timer.
- the status report constructing module is further configured to: when the retransmission detection module detects that the retransmission triggered by the status report is unsuccessful, trigger the status report again.
- the window state detecting module is further configured to: if the data receiving window is in a smooth moving state, if the distance between the trailing edge and the leading edge of the data receiving window is within the interval [0, Window_Size-N) , it is determined that the data receiving window is in a smooth moving state; conversely, if the distance between the trailing edge and the leading edge of the data receiving window is within the interval [Window_Size-N, Window_Size], it is determined that the data receiving window is about to be full Or the data receiving window is not in a smooth moving state; wherein, N can be configured as an integer greater than 0 and smaller than Window_Size/2; Window_Size refers to the size of the data receiving window.
- the retransmission detection module is further configured to: when detecting whether the retransmission triggered by the status report sent by the status report construction module is successful, recording a transmission time of the status report sent by the status report construction module System frame number; current system frame number and record The difference between the system frame numbers of the recorded status report transmission time is equal to the number of system frames that are required to be sent from the status report to the completion of the retransmission, and whether the position of the trailing edge of the data receiving window changes, and if a change occurs, It is determined that the retransmission triggered by the current status report is successful; if no change occurs, it is determined that the retransmission triggered by the current status report is unsuccessful.
- the status report triggering device further includes a trigger cutoff module, and the trigger cutoff module is configured to: when the reordering timer expires, or when the receiving end receives the next polling message sent by the sending end, Transmitting the other modules in the device, including the status report construction module, the window state detection module, the retransmission detection module, and the timer adjustment module, stopping the trigger processing of the current status report, and transferring to the next state Processing of the report.
- the RLC can reliably make the lost data retransmitted and delivered.
- the data receiving end ensures that the transmitting end retransmits the lost data as soon as possible by repeating the transmission status report, thereby reducing or avoiding the window stagnation caused by the transmitting end of the transmitting window being full.
- Figure 1 is a schematic diagram of the architecture of the RLC in the acknowledge mode protocol
- Figure 2 is a schematic diagram of a state in which the window is stagnant due to fullness
- Figure 3 is a schematic diagram of the state after the window resumes sliding
- FIG. 4 is a schematic flowchart of a method for triggering a status report according to the present invention.
- FIG. 5 is a schematic flowchart of a state report triggering method according to an embodiment of the present invention
- FIG. 6 is a schematic structural diagram of a state report triggering apparatus according to the present invention. detailed description
- the triggering method of the status report is performed only once in the state of the data transmission window, and the status report is constructed only once, and the status report cannot be successfully sent to the data transmitting end, thereby failing to ensure that the status report can be triggered.
- a valid message retransmission may result in at least one state inhibit timer period, or a reorder timer period or a polling timer period, in order to release the window when the window is stalled due to being full.
- the state of stagnation causes the air interface data transmission to be delayed, and the air interface data transmission speed is low.
- the invention can effectively ensure that the retransmission triggered by the status report is effective, thereby effectively avoiding the problem that the message retransmission method in the related art has a low transmission speed of the air interface when the window is stagnant due to being full, and realizes In the case of various data transmission window states, air interface data transmission can be performed in time, which improves the speed and efficiency of air interface data transmission.
- Figure 2 shows a schematic diagram of the data transfer window in a stagnant state.
- VT(S) When the send window is stagnant, VT(S) cannot move backwards to send new data. The stalled state ends only when the PDU numbered 0 is retransmitted by the sender and acknowledged by the receiver. Therefore, when the window is in a stagnant state, the data transmission is interrupted, which seriously affects the empty space. The transmission speed of the port data.
- Figure 3 shows a schematic diagram of the data transfer window in a moving state.
- the send window is also in motion and VT(S) can be moved backwards to send new data.
- the process of the status report triggering method proposed in this paper is shown in Figure 4. It includes the following contents: trigger status report; construct status report and send; detect the status of the receiving window, see if the window is about to be full and stagnant, if yes, make sure The retransmission triggered by the status report is valid, so that the stagnation state of the window is released as soon as possible, and then the current processing flow is ended; if not, the current processing flow is directly ended.
- the VR(R) distance of the trailing edge of the receiving window should be examined first.
- T status_prohibit—n*10*Wait—Retx— Threshold
- T status_prohibit is the state-inhibited timer duration
- FIG. 5 is a schematic flowchart of a method for triggering a status report according to an embodiment of the present invention. As shown in FIG. 5, in the embodiment, the method for triggering the state of the present invention specifically includes the following steps:
- Step S01 In the RLC uplink packet processing, the reordering timer t-Reordering times out, or the uplink polling packet is received in the uplink, thereby triggering the status report.
- Step S02 constructing the state ⁇ report and send.
- Step S03 Detecting the size of the window, and seeing whether the receiving window is in a smooth moving state, that is, whether the window size is within the interval [0, Window_Size-N].
- Step S04 the window moves smoothly, that is: the window size is within the interval [0, Window_Size-N], the frame number is not sent by the record status report, the Init_SFN is invalidated, and the start state prohibit timer t_status_prohibito
- Step S06 Check if Init_SFN is valid.
- Step S07 If Init_SFN is valid, the current system frame number cur_SFN is recorded.
- Step S09 The retransmission triggered by the last status report should arrive, and check whether VR(R) changes, that is, whether the retransmission triggered by the status report is successful.
- Step S10 VR (R) changes, indicating that the retransmission triggered by the status report has been successful, and the status prohibit timer is started.
- Steps Sl1 and VR(R) have not changed, indicating that the retransmission triggered by the status report is unsuccessful, and the status report is triggered again.
- the status report repeats the number of triggers n plus 1, and returns to step S03.
- the size of the state prohibit timer t_status_prohibit is set to 200ms (maximum can be set to 500ms), and Wait_Retx_Threshold is 20ms. If the status report is triggered when the window is full, but the status report is lost in the air interface or is decoded at the data sending end, the solution can trigger the status report again, and assume that the status report triggered again is successfully sent to the data sending end. And triggers a valid data retransmission. After the data is retransmitted, the receiving window ends in a stagnant state. The corresponding steps are:
- the time interval to the re-trigger is only 20 ms, and the stagnation state of the window can be released 180 (ms) earlier than without using the scheme of the present invention.
- the status report triggering apparatus of the present invention includes a status report structure module, a window status detection module, a retransmission detection module, a timer adjustment module, and a trigger cutoff module.
- the status report constructing module is configured to construct a status report when the reordering timer expires or the data receiving end of the radio link control layer receives the message of the polling bit transmitted by the transmitting end. Sending; and when the retransmission detection module detects that the retransmission triggered by the status report is unsuccessful, the status report is triggered again.
- the window state detecting module is configured to detect whether the data receiving window of the wireless link control layer is in a smooth moving state after the status report constructing module sends the status report, and the detecting method used includes:
- the data receiving window is considered to be in a smooth moving state; conversely, if the distance between the trailing edge of the data receiving window and the leading edge is in the interval [Window_Size Within -N , Window_Size], the data receiving window is about to be full or full, that is, the data receiving window is not in a smooth moving state; wherein N can be configured to be greater than 0 and smaller than Window- Size I 2 Integer, Window—Size refers to the size of the data receiving window. In the 36.322 protocol, the size of the data receiving window in RLC AM mode is 512.
- the retransmission detection module is configured to: when the window status detection module detects that the data reception window is not in a smooth moving state, and detects whether the retransmission triggered by the status report sent by the status report construction module is successful, and the detection scheme used by the detection status includes:
- the purpose of the timer adjustment module is as follows: When the window state detection module detects that the data reception window is in a smooth moving state, the startup state prohibits the timer, and sets the state prohibition timer duration to: T_status_prohibi - n* 10*Wait_Retx — Threshold , where T_status_prohibit is the state-inhibited timer duration in the 36.322 protocol, where n is the number of times the status report is repeatedly triggered before the retransmission triggered by the status report is successful.
- n 0;
- the trigger cutoff module is configured to: when the reordering timer expires or the receiving end receives the message of the next polling bit sent by the sending end, the other modules of the device are sent to include a status report constructing module, a window state detecting module, and a heavy
- the transmission detection module and the timer adjustment module stop processing the current status report, and transfer to the processing of the next status.
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Description
一种状态报告触发方法及装置 技术领域
本发明涉及移动通信技术领域, 尤其涉及长期演化(LTE, Long Term Evolution ) 系统内, 无线链路控制层确认模式协议中的一种状态报告触发 方法及装置。 背景技术
无线链路控制 (RLC, Radio Link Control )协议层在 LTE的无线接口 协议栈中,是层 2( L2 )的一个子层,位于媒体接入控制( MAC, Media Access Control )层和包数据汇聚协议(PDCP, Packet Data Convergence Protocol ) 层之间。 RLC协议层的功能包括链接控制、 封装和重组、 级联、 用户数据 传输、 糾错、 协议错误检测和修复等, 为用户和控制数据提供分段和重传 业务。
每个 RLC协议实体由无线资源控制 ( RRC, Radio Resource Control ) 层配置并以三种数据传送模式进行工作,分别为:透明模式( TM, Transparent Mode )、 非确认模式 (UM , Unacknowledged Mode)和确认模式 ( AM , Acknowledged Mode )。确认模式中的自动重传请求( ARQ, Automatic Repeat Request ), 是通过接收端向发送端发送状态报告( Status Report ), 发送端根 据 Status Report中的状态报告截止的报文编号( ACK— SN )和 ACK— SN之 前未收到报文的报文编号 (NACK— SN )来判定哪些协议数据单元(PDU, Protocol Data Unit ) 已经被接收端确认收到, 哪些 PDU或 PDU片段需要重 传, 从而保证数据传输的可靠性。 图 1为 RLC 在确认模式协议中的架构 示意图。
36.322 协议中, 目前对确认模式下状态报告的触发过程涉及到了两个
定时器,都用在 RLC的数据传输接收端。首先是重排定时器(t-Reordering ), t-Reordering用于侦测底层数据的丟失情况,超时后向发送端发送状态报告。 其次是状态禁止定时器 ( t-StatusProhibit ), t-StatusProhibit用于限定状态报 告的发送频度, 即两次状态报告的发送时刻要满足一定的时间间隔。 状态 报告的触发有两种方式: 1、 RLC发送端通过轮询的方式触发; 2、 RLC接 收端侦测到 PDU接收失败(重排定时器超时)。 这里主要介绍一下和本发 明相关的第二种方式。 首先, RLC接收端若侦测到报文不是按照顺序到达 的, 就会立即启动重排定时器 t-Reordering, t— reordering定时器超时会触发 VR(MS)的更新和状态报告的发送, VR(MS)在数据接收窗口中用于标识构 造状态报告的截止位置, 即前述 ACK— SN的取值, 状态报告的发送必须在 VR(MS)的更新之后触发。 其次, 状态报告的触发并不是毫无限制的, 需要 满足一定的发送间隔。若状态禁止定时器 t-StatusProhibit没有运行,在下层 指示的第一个发送时机到来时, 构造 Status Report, 并向下层投递; 否则, 在 t-StatusProhibit定时器超时之后的第一个下层指示的发送时机到来时,构 造 Status Report,并向下层投递。当一个状态 4艮告已经向下层投递, RLC AM 实体接收侧会启动 t— status_prohibit定时器。
从上面的论述可以看到, 确认模式下报文的传送需要通过状态报告进 行确认。 由于底层混合自动重传请求 (HARQ , Hybrid Automatic Repeat Request )对丟失报文的重传次数有限制, 因此状态报告本身在 RLC层没有 机制确保一定收到, 而且两次状态报告的触发要满足一定的时间间隔。 这 样, 如果状态报告在底层丟失, 也就说该状态报告的报文重传没有成功, 那么只能等到下次触发状态报告才能实现。
然而, 在确认模式的某些情况下, 上层对状态报告的确认是有必要的, 主要表现在接收窗口即将被撑满的情况下。 当接收窗口停滞时,发送窗口必 定也已经停滞。 此时, 若数据接收端触发了状态报告却在底层丟失, 只能
等到触发新一轮状态报告要求发送端把相应的 PDU分片重传。
现有相关技术中, 状态报告的触发方法无论在何种数据传输窗口状态 下, 每次构造的状态报告仅发送一次, 且不能确保状态报告成功发送到数 据发送端, 从而无法确保状态报告能触发有效的报文重传, 造成在窗口因 被撑满而停滞的情况下, 可能至少需要等待一个状态禁止定时器周期, 也 可能是重排定时器周期或轮询定时器周期, 才能解除窗口的停滞状态, 从 而造成空口数据传输被延迟, 空口数据传输速度较低。 发明内容
本发明要解决的技术问题是提供一种无线链路控制层确认模式协议 中, 状态报告的触发方法及装置, 能确保状态报告触发的重传切实有效, 从而避免在窗口因被撑满而停滞的情况下, 空口数据传输速度较低的问题。
为解决上述技术问题, 本发明状态报告触发方法包括:
步骤 A、 在无线链路控制层的数据接收端, 当重排定时器超时、 或者 接收到发送端传来的置轮询位的报文时, 构造状态报告并发送, 然后执行 步骤 B;
步骤 B、 判断数据接收窗口是否处于顺畅移动状态, 若处于顺畅移动 状态, 则在发送完所述状态报告之后, 立即启动状态禁止定时器, 认为该 次状态报告触发重传成功; 若数据接收窗口并非处于顺畅移动状态, 则执 行步骤 C;
步骤 C、 检测本次状态报告触发的重传是否成功, 若成功, 则启动状 态禁止定时器; 若不成功, 则执行步骤 D;
步骤 D、 再次触发所述状态报告, 并返回步骤 B。
进一步地, 在步骤 B中, 判断数据接收窗口是否处于顺畅移动状态具 体包括:
若数据接收窗口后沿和前沿的距离在区间 [0, Window— Size-N)之内,则
判断出数据接收窗口处于顺畅移动状态; 反之, 若数据接收窗口后沿和前 沿的距离在区间 [Window— Size-N , Window— Size]之内, 则判断出数据接收 窗口即将被撑满或已撑满, 也即数据接收窗口并非处于顺畅移动状态; 其 中, Ν可配置为一个大于 0, 且小于 Window— Size/2的整数; Window— Size 指数据接收窗口的大小。
进一步地, 步骤 B中, 在所述启动状态禁止定时器时, 该方法还包括: 将 状 态 禁 止 定 时 器 的 时 长 设 置 为 T— status_prohibit - n* 10 * Wait— Retx— Threshold , 其中 T— status_prohibit为状态禁止定时器时长; n表示所述状态报告之前重复触发的次数, 第一次触发时取 n=0。
进一步地, 步骤 C中, 检测本次状态报告触发的重传是否成功具体包 括:
步骤 C 1、 记录本次状态 告的发送时刻的系统帧号;
步骤 C 2、 当前时刻的系统帧号与记录的所述状态 ^艮告发送时刻的系统 帧号之差等于从状态报告发出到重传完成所需经过的系统帧个数时, 判断 数据接收窗口后沿的位置是否发生变化, 若发生变化, 则判断出本次状态 报告触发的重传成功; 若不发生变化, 则判断出本次状态报告触发的重传 不成功。
进一步地, 步骤 C中, 若检测到该次状态报告触发的重传成功, 则在 所述启动状态禁止定时器时, 该方法还包括: 将状态禁止定时器的时长设 置为 T_status_prohibit - n*10 * Wait— Retx— Threshold , 其中 T— status_prohibit 为状态禁止定时器时长; n表示在所述状态报告触发的重传成功之前, 所 述状态报告重复触发的次数, 第一次触发时取 n=0。
进一步地, 该方法还包括: 在重排定时器超时、 或者接收端接收到发 送端传来的下一个置轮询位的报文时, 结束当前状态报告的触发流程并转 入对下一个状态报告的处理。
为解决上述技术问题, 本发明状态报告触发装置包括: 状态报告构造 模块、 窗口状态检测模块、 重传侦测模块和定时器调整模块; 其中,
状态报告构造模块, 用于当重排定时器超时、 或者无线链路控制层的 数据接收端接收到发送端传来的置轮询位的报文时, 构造状态报告并发送; 窗口状态检测模块, 用于在所述状态报告构造模块发送所述状态报告 之后, 检测无线链路控制层的数据接收窗口是否处于顺畅移动状态;
重传侦测模块, 用于当所述窗口状态检测模块检测到数据接收窗口并 非处于顺畅移动状态时, 检测所述状态报告构造模块发送的状态报告所触 发的重传是否成功;
定时器调整模块, 用于当所述窗口状态检测模块检测到数据接收窗口 处于顺畅移动状态时, 启动状态禁止定时器, 认为该次状态报告触发重传 成功; 当所述重传侦测模块检测到本次状态报告触发的重传成功时, 启动 状态禁止定时器。
所述状态报告构造模块, 进一步用于当所述重传侦测模块检测到状态 报告触发的重传不成功时, 再次触发所述状态报告。
进一步地, 所述窗口状态检测模块, 进一步用于在检测数据接收窗口 是否处于顺畅移动状态的情况下, 若数据接收窗口后沿和前沿的距离在区 间 [0, Window— Size-N)之内, 则判断出数据接收窗口处于顺畅移动状态; 反 之, 若数据接收窗口后沿和前沿的距离在区间 [Window— Size-N , Window— Size]之内, 则判断出数据接收窗口即将被撑满或已撑满, 也即数 据接收窗口并非处于顺畅移动状态; 其中, N可配置为一个大于 0, 且小于 Window— Size/2的整数; Window— Size指数据接收窗口的大小。
进一步地, 所述重传侦测模块, 进一步用于检测所述状态报告构造模 块发送的状态报告所触发的重传是否成功的情况下, 记录所述状态报告构 造模块发送的状态报告的发送时刻的系统帧号; 当前时刻的系统帧号与记
录的所述状态报告发送时刻的系统帧号之差等于从状态报告发出到重传完 成所需经过的系统帧个数时, 判断数据接收窗口后沿的位置是否发生变化, 若发生变化, 则判断出本次状态报告触发的重传成功; 若不发生变化, 则 判断出本次状态 ^艮告触发的重传不成功。
进一步地, 所述定时器调整模块, 进一步用于在启动所述状态禁止定 时器时, 将所述状态禁止定时器的时长设置为: T— status_prohibit - n* 10 * Wait— Retx— Threshold , 其中 T— status_prohibit为状态禁止定时器时长; n表示在所述状态报告触发的重传成功之前, 所述状态报告重复触发的次 数, 第一次触发时取 n=0。
进一步地, 该状态报告触发装置还包括触发截止模块, 所述触发截止 模块, 用于在重排定时器超时、 或者接收端接收到发送端传来的下一个置 轮询位的报文时, 传令所述装置中的其他各模块, 包括状态报告构造模块、 窗口状态检测模块、 重传侦测模块和定时器调整模块在内, 停止对当前状 态报告的触发处理, 并转入对下一个状态报告的处理。
釆用本发明的技术方案, RLC 能够使丟失数据切实得到重传和投递。 特别是在窗口即将被撑满的情况下, 数据接收端通过重复发送状态报告确 保发送端尽快重传丟失数据, 从而减少或避免由于发送端发送窗口被撑满 而导致的窗口停滞。 附图说明
图 1为 RLC 在确认模式协议中的架构示意图;
图 2为窗口因撑满而停滞的状态示意图;
图 3为窗口恢复滑动后的状态示意图;
图 4为本发明状态报告触发方法的流程示意图;
图 5为本发明一个具体实施例的状态报告触发方法流程示意图; 图 6为本发明状态报告触发装置结构示意图。
具体实施方式
下面结合附图和具体实施方式对本发明作进一步详细说明。
现有相关技术中, 状态报告的触发方法无论在何种数据传输窗口状态 下, 每次构造的状态报告仅发送一次, 且不能确保状态报告成功发送到数 据发送端, 从而无法确保状态报告能触发有效的报文重传, 造成在窗口因 被撑满而停滞的情况下, 可能至少需要等待一个状态禁止定时器周期, 也 可能是重排定时器周期或轮询定时器周期, 才能解除窗口的停滞状态, 从 而造成空口数据传输被延迟, 空口数据传输速度较低。
本发明能有效确保状态报告触发的重传切实有效, 从而有效避免相关 技术中的报文重传方法在窗口因被撑满而停滞的情况下, 空口数据传输速 度较低的问题, 实现了在各种数据传输窗口状态情况下, 空口数据传输均 可及时进行, 提高了空口数据传输速度和效率。
图 2和图 3分别示出了数据传输窗口处于停滞状态和移动状态的示意 图, 其中发送窗口和接收窗口的窗口大小均为 Window— Size=512 , 窗口全 部为斜线占满表示该 PDU全部收到, 仅一半为斜线表明仅收到部分 PDU , 仍有一个或多个 PDU分片未收到。
图 2示出了数据传输窗口处于停滞状态的示意图。 其中接收窗口未收 到的 PDU 的最小编号为 0 , 即 VR(R)=0 , 而 VR(H)=512 , 故有 VR(H)-VR(R)=512=Window— Size, 表明该接收窗口已被撑满, 处于停滞状 态, 其中 VR(R)表示接收窗口的后沿, VR(H)表示接收窗口的前沿。 而当接 收窗口停滞时, 发送窗口也必定已停滞, 因为 Window— Size=VT(S)-VT(A) , 此时 VT(S) > VR(H), JL VT(A) < VR(R), VT(A)指发送窗口的后沿, VR(R) 指发送窗口的前沿。 当发送窗口停滞时, VT(S)无法向后移动以发送新的数 据。 只有当编号为 0的 PDU由发送端重传并被接收端确认收到时, 停滞状 态才会结束。 故当窗口处于停滞状态时, 数据传输被中断, 严重影响了空
口数据的传输速度。
图 3 示出了数据传输窗口处于移动状态的示意图。 其中接收窗口未收 到的 PDU 的最小编号为 i>0 , 即 VR(R)=i>0 , 而 VR(H)=512 , 故有 VR(H)-VR(R)<512=Window_Size , 表明该接收窗口未被撑满, 处于移动状 态。 此时发送窗口也处于移动状态, VT(S)可以向后移动以发送新的数据。
本文提出的状态报告触发方法处理流程如图 4所示, 包括如下内容: 触发状态报告; 构造状态报告并发送; 侦测接收窗口状况, 看窗口是否即 将被撑满而停滞, 如果是, 则确保状态报告触发的重传切实有效, 从而尽 快解除窗口的停滞状态, 之后结束当前处理流程; 如果不是, 则直接结束 当前处理流程。
针对图 4所示的内容具体来说, t-Reordering超时或者接收端收到发送 端置轮询位的报文, 从而触发了状态报告之后, 应先考察该接收窗口后沿 VR(R)距离接收窗口前沿 VR(H)的距离:
1、 若 VR(R)和 VR(H)的距离在区间 [0, Window— Size-N)之内, 则发送 完该状态报告之后, 启动 t— status_prohibit定时器, 并将定时器时长设置为
T— status_prohibit— n*10*Wait—Retx— Threshold, 其中 T— status_prohibit为状 态禁止定时器时长, n表示该状态报告之前重复触发的次数, 第一次触发 时取 n=0;
2、 若 VR(R)和 VR(H)的距离在区间 [Window_Size-N, Window Size] 之内, 说明接收窗口即将被撑满或已撑满, 则:
1 )发送完该状态报告之后, 记录发送该状态报告时刻的系统帧号 Init SFN , 之后的每个系统帧 Cur— SFN , 计算系统帧的变化值 Delta_SFN=Cur_SFN-Init_SF , 当 Delta— SFN = Wait— Retx— Threshold时, 对 VR(R)的位置进行考察:
a )若发现 VR(R)的位置未发生改变, 则认为本次状态报告发送失败,
再次触发状态报告, 转步骤 1), 直到 t-Reordering超时或者接收端收到发送 端置轮询位的报文;
b )若发现 VR(R)的位置发生变化, 则认为本次状态报告发送成功, 启动 t— status_prohibit 定时器, 并设定 t— status_prohibit 定时器的时长为 T_status_prohibit - n*10*Wait— Retx— ThreshokL 这是由于在 36.322协议中, 状态禁止定时器在状态报告发送完成之后立即启动, 而这里在确定状态报 告触发的重传成功后才启动, 因此要排除之前消耗的时间。
其中, N 可配置为一个大于 0 而小于 Window— Size/2 的整数; Wait— Retx— Threshold表示从状态 艮告发送到重传完成经过的系统帧个数 (每帧 10ms ), n表示在状态报告触发的重传成功之前, 该状态报告重复触 发的次数 , 第一次触发时取 n = 0。
图 5是本发明一个具体实施例的状态报告触发方法流程示意图,如图 5 所示, 该实施例中, 本发明状态 4艮告触发方法具体包括如下步骤:
步骤 S01、 RLC上行报文处理中, 重排定时器 t-Reordering超时, 或者 上行收到了置轮询位的报文, 从而触发了状态报告。
步骤 S02、 构造状态^艮告并发送。
步骤 S03、 对窗口大小进行侦测, 看接收窗口是否处于顺畅移动状态, 即: 窗口大小是否在区间 [0, Window— Size-N]之内。
步骤 S04、 窗口移动顺畅, 即: 窗口大小在区间 [0 , Window— Size-N] 之内, 则不用记录状态报告发送帧号, 将 Init— SFN置为无效, 启动状态禁 止定时器 t_status_prohibito
步骤 S05、 接收窗口停滞, 或者即将停滞, 即: 窗口大小不在区间 [0, Window— Size-N]之内, 则记录状态报告发送的系统帧号 Init— SFN, 并置状 态报告发送次数 n = 0。
步骤 S06、 检查 Init— SFN是否有效。
步骤 S07、 若 Init— SFN有效, 则记录当前的系统帧号 cur— SFN。
步骤 S08、检查 Delta— SFN =Cur_SFN-Init_SFN是否达到了状态报告触 发重传完成所需的时间, 若达到该时间则执行步骤 S 09。
步骤 S09、 上次状态报告触发的重传应该到达, 检查 VR ( R )是否发 生改变, 即: 状态报告触发的重传是否成功。
步骤 S10、 VR ( R )发生改变, 说明状态报告触发的重传已经成功, 启 动状态禁止定时器。
步骤 Sl l、 VR ( R ) 未发生改变, 说明状态报告触发的重传没有成功, 再次触发状态报告, 状态报告重复触发次数 n加 1 , 并返回步骤 S03。
该实施例中可假设 AM 模式业务建立时, 状态禁止定时器 t_status_prohibit 的 大小设定为 200ms(最大可设置为 500ms) , Wait— Retx— Threshold为 20ms。 在窗口撑满的情况下触发了状态报告, 但状 态报告在空口中丟失, 或者在数据发送端解错, 那么本方案可再次触发状 态报告, 并假设再次触发的状态报告成功发送到数据发送端, 并触发了有 效的数据重传, 数据重传之后接收窗口结束了停滞状态, 此时对应的步骤 为:
S01 ^S02^S03^S05^S06^S07^S08^S09
^S11 ^S03^S05^S06^S07^S08^S09^S10。
由此可见, 釆用本发明技术方案, 状态报告丟失之后, 到再次触发的 时间间隔仅为 20ms, 比不使用本发明方案能提前 180 ( ms )解除窗口的停 滞状态。
图 6为本发明状态报告触发装置结构示意图, 如图 6所示, 本发明状 态报告触发装置包括状态报告构造模块、 窗口状态检测模块、 重传侦测模 块、 定时器调整模块和触发截止模块。
其中, 状态报告构造模块用于当重排定时器超时, 或者无线链路控制 层的数据接收端收到了发送端传来的置轮询位的报文时, 构造状态报告并
发送; 以及当重传侦测模块检测到状态报告触发的重传不成功时, 再次触 发该状态报告。
窗口状态检测模块用于在状态报告构造模块发送状态报告之后, 检测 无线链路控制层的数据接收窗口是否处于顺畅移动状态, 其釆用的检测方 案包括:
若数据接收窗口后沿和前沿的距离在区间 [0 , Window— Size-N)之内,则 认为数据接收窗口处于顺畅移动状态; 反之, 若数据接收窗口后沿和前沿 的距离在区间 [Window_Size-N , Window_Size]之内, 则认为数据接收窗口 即将被撑满或已撑满, 也即数据接收窗口并非处于顺畅移动状态; 其中, N 可配置为一个大于 0而小于 Window— Size I 2的整数, Window— Size指数据 接收窗口的大小, 在 36.322协议中 RLC AM模式下数据接收窗口的大小为 512。
重传侦测模块用于, 当窗口状态检测模块检测到数据接收窗口并非处 于顺畅移动状态时, 检测状态报告构造模块发送的状态报告所触发的重传 是否成功, 其釆用的检测方案包括:
记录所述状态报告构造模块发送的状态报告的发送时刻的系统帧号; 当当前时刻的系统帧号与记录的所述状态报告发送时刻的系统帧号之 差等于从状态报告发出到重传完成所需经过的系统帧个数时, 判断数据接 收窗口后沿的位置是否发生变化, 若发生变化则认为该状态报告触发的重 传成功, 否则认为不成功。
定时器调整模块的用途包括: 当窗口状态检测模块检测到数据接收窗 口处于顺畅移动状态时, 启动状态禁止定时器, 并将该状态禁止定时器时 长设 置 为 : T_status_prohibi - n* 10*Wait—Retx— Threshold , 其 中 T_status_prohibit为 36.322协议中的状态禁止定时器时长, n表示在该状态 报告触发的重传成功之前, 该状态报告重复触发的次数, 第一次触发时取
n=0; 当重传侦测模块检测到该次状态报告触发的重传成功时, 启动状态禁 止定时器, 并将该状态禁止定时器时长设置为: T— status_prohibi - n*10*Wait—Retx— Threshold, 其中 T— status_prohibit为 36.322协议中的状态 禁止定时器时长, n表示在该状态报告触发的重传成功之前, 该状态报告 重复触发的次数 , 第一次触发时取 n=0。
触发截止模块用于在重排定时器超时或者接收端收到发送端传来的下 一个置轮询位的报文时, 传令该装置其他各模块包括状态报告构造模块、 窗口状态检测模块、 重传侦测模块和定时器调整模块停止对当前状态报告 的处理, 而转入对下一个状态 ^艮告的处理。
以上所述的具体实施例, 对本发明的目的、 技术方案和有益效果进行 了进一步详细说明, 所应注意的是, 以上所述仅为本发明的具体实施例而 已, 本领域的技术人员可以对本发明进行各种改动和变型而不脱离本发明 的精神和范围。 这样, 倘若本发明的这些修改和变型属于本发明权利要求 记载的技术方案及其等同技术的范围之内, 则本发明也意图包含这些改动 和变型在内。
Claims
1、 一种状态^艮告触发方法, 其特征在于, 该方法包括:
步骤 A、 在无线链路控制层的数据接收端, 当重排定时器超时、 或者 接收到发送端传来的置轮询位的报文时, 构造状态报告并发送, 然后执行 步骤 B;
步骤 B、 判断数据接收窗口是否处于顺畅移动状态, 若处于顺畅移动 状态, 则在发送完所述状态报告之后, 立即启动状态禁止定时器; 若数据 接收窗口并非处于顺畅移动状态, 则执行步骤 C;
步骤 C、 检测本次状态报告触发的重传是否成功, 若成功, 则启动状 态禁止定时器; 若不成功, 则执行步骤 D;
步骤 D、 再次触发所述状态报告, 并返回步骤 B。
2、 根据权利要求 1所述的状态报告触发方法, 其特征在于, 在步骤 B 中, 判断数据接收窗口是否处于顺畅移动状态具体包括:
若数据接收窗口后沿和前沿的距离在区间 [0, Window— Size-N)之内,则 判断出数据接收窗口处于顺畅移动状态; 若数据接收窗口后沿和前沿的距 离在区间 [Window_Size-N , Window_Size]之内, 则判断出数据接收窗口并 非处于顺畅移动状态;
其中, N为大于 0, 且小于 Window— Size/2的整数; Window— Size指数 据接收窗口的大小。
3、 根据权利要求 1或 2所述的状态报告触发方法, 其特征在于, 步骤 B 中, 在所述启动状态禁止定时器时, 该方法还包括: 将状态禁止定时器 的时长设置为 T— status_prohibit - n*10*Wait—Retx— Threshold , 其中 T_status_prohibit为状态禁止定时器时长; n表示所述状态报告之前重复触 发的次数 , 第一次触发时取 n=0。
4、 根据权利要求 1或 2所述的状态报告触发方法, 其特征在于, 步骤 C中, 检测本次状态报告触发的重传是否成功具体包括:
步骤 C 1、 记录本次状态 告的发送时刻的系统帧号;
步骤 C 2、 当前时刻的系统帧号与记录的所述状态 ^艮告发送时刻的系统 帧号之差等于从状态报告发出到重传完成所需经过的系统帧个数时, 判断 数据接收窗口后沿的位置是否发生变化, 若发生变化, 则判断出本次状态 报告触发的重传成功; 若不发生变化, 则判断出本次状态报告触发的重传 不成功。
5、 根据权利要求 1或 2所述的状态报告触发方法, 其特征在于, 步骤 C中, 若检测到该次状态报告触发的重传成功, 则在所述启动状态禁止定 时器时, 该方法还包括: 将状态禁止定时器的时长设置为 T— status_prohibit - n*10*Wait—Retx— Threshold;
其中 T— status_prohibit为状态禁止定时器时长; n表示在所述状态报告 触发的重传成功之前,所述状态报告重复触发的次数,第一次触发时取 n=0。
6、 根据权利要求 1或 2所述的状态报告触发方法, 其特征在于, 该方 法还包括: 在重排定时器超时、 或者接收端接收到发送端传来的下一个置 轮询位的报文时, 结束当前状态报告的触发流程并转入对下一个状态报告 的处理。
7、 一种状态^艮告触发装置, 其特征在于, 所述装置包括: 状态 告构 造模块、 窗口状态检测模块、 重传侦测模块和定时器调整模块; 其中, 状态报告构造模块, 用于当重排定时器超时、 或者无线链路控制层的 数据接收端接收到发送端传来的置轮询位的报文时, 构造状态报告并发送; 以及当所述重传侦测模块检测到状态报告触发的重传不成功时, 再次触发 所述状态报告;
窗口状态检测模块, 用于在所述状态报告构造模块发送所述状态报告 之后, 检测数据接收窗口是否处于顺畅移动状态; 重传侦测模块, 用于当所述窗口状态检测模块检测到数据接收窗口并 非处于顺畅移动状态时, 检测所述状态报告构造模块发送的状态报告所触 发的重传是否成功;
定时器调整模块, 用于当所述窗口状态检测模块检测到数据接收窗口 处于顺畅移动状态时, 启动状态禁止定时器; 当所述重传侦测模块检测到 本次状态 ^艮告触发的重传成功时, 启动状态禁止定时器。
8、 根据权利要求 7所述的状态报告触发装置, 其特征在于, 所述窗口 状态检测模块, 进一步用于在检测数据接收窗口是否处于顺畅移动状态的 情况下,若数据接收窗口后沿和前沿的距离在区间 [0 , Window— Size-N)之内, 则判断出数据接收窗口处于顺畅移动状态; 若数据接收窗口后沿和前沿的 距离在区间 [Window_Size-N , Window_Size]之内, 则判断出数据接收窗口 并非处于顺畅移动状态;
其中, N为大于 0, 且小于 Window— Size/2的整数; Window— Size指数 据接收窗口的大小。
9、 根据权利要求 7所述的状态报告触发装置, 其特征在于, 所述重传 侦测模块, 进一步用于检测所述状态报告构造模块发送的状态报告所触发 的重传是否成功的情况下, 记录所述状态报告构造模块发送的状态报告的 发送时刻的系统帧号; 当前时刻的系统帧号与记录的所述状态报告发送时 刻的系统帧号之差等于从状态报告发出到重传完成所需经过的系统帧个数 时, 判断数据接收窗口后沿的位置是否发生变化, 若发生变化, 则判断出 本次状态报告触发的重传成功; 若不发生变化, 则判断出本次状态报告触 发的重传不成功。
10、 根据权利要求 7、 8或 9所述的状态报告触发装置, 其特征在于, 所述定时器调整模块, 进一步用于在启动状态禁止定时器时, 将状态禁止 定时器的时长设置为: T— status_prohibit - n*10*Wait—Retx— Threshold; 其中 T— status_prohibit为状态禁止定时器时长; n表示在所述状态报告 触发的重传成功之前,所述状态报告重复触发的次数,第一次触发时取 n=0。
11、 根据权利要求 7、 8或 9所述的状态报告触发装置, 其特征在于, 所述装置还包括触发截止模块; 所述触发截止模块, 用于在重排定时器超 时、 或者接收端接收到发送端传来的下一个置轮询位的报文时, 传令所述 装置中的其他各模块停止对当前状态报告的触发处理, 并转入对下一个状 态报告的处理。
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