WO2011012005A1 - Procédé et dispositif côté réception de déclenchement de rapport d'état dans la couche de commande de liaison radio - Google Patents

Procédé et dispositif côté réception de déclenchement de rapport d'état dans la couche de commande de liaison radio Download PDF

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Publication number
WO2011012005A1
WO2011012005A1 PCT/CN2010/072686 CN2010072686W WO2011012005A1 WO 2011012005 A1 WO2011012005 A1 WO 2011012005A1 CN 2010072686 W CN2010072686 W CN 2010072686W WO 2011012005 A1 WO2011012005 A1 WO 2011012005A1
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WO
WIPO (PCT)
Prior art keywords
status report
receiving side
threshold
sending
adjustment state
Prior art date
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PCT/CN2010/072686
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English (en)
Chinese (zh)
Inventor
贾皓昕
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Publication of WO2011012005A1 publication Critical patent/WO2011012005A1/fr

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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
    • H04L1/1832—Details of sliding window management
    • 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

Definitions

  • the present invention relates to the control of a transmitting side entity of an RLC (Radio Link Control Layer) AM (Acknowledged Mode) in a Long Term Evolution System (LTE) in the field of wireless communication, and more particularly to a radio link control layer.
  • RLC Radio Link Control Layer
  • LTE Long Term Evolution System
  • the wireless protocol structure of the E-UTRAN (Evolved Universal Terrestrial Radio Access Network) is divided into a user plane and a control plane.
  • the wireless side is divided into physical layer (PHY), medium access control (MAC), RLC, and packet data convergence protocol (PDCP) sublayer.
  • PHY physical layer
  • MAC medium access control
  • RLC packet data convergence protocol
  • PDCP packet data convergence protocol
  • the RLC protocol layer is a sublayer of Layer 2 (L2) in the radio interface protocol stack of LTE.
  • L2 Layer 2
  • the RLC layer provides segmentation and retransmission services for user and control data.
  • RLC features include link control, encapsulation and reassembly, cascading, user data transfer, error correction, protocol error detection and repair.
  • Each RLC entity is configured by RRC (Radio Resource Control Layer) and operates in three modes: TM (Transparent Mode), UM (Unacknowledged Mode), and AM (Acknowledged Mode). .
  • TM Transmission Mode
  • UM Unacknowledged Mode
  • AM Acknowledged Mode
  • TM and UM modes it can be divided into two entities: receiving entity and sending entity.
  • AM mode there is only one entity that can receive RLC PDUs (Protocol Data Units) or RLC SDUs (Service Data Units).
  • the receiving AM entity and the transmitting AM entity respectively ensure a sequence and non-destructive reception of data and an effective retransmission through a series of mechanisms such as receiving a sliding window, sending a sliding window, and status reporting.
  • Polling PDU is a special packet in AM mode. Its function is to pass the message. Knowing the receiving end: The sending end expects to receive a status report for the message sent by the previous sending end.
  • the status report is also a control message in AM mode.
  • the message is the result of the check by the receiving end for the current receiving sliding window.
  • the message contains the upper edge number of the current receiving sliding window check interval.
  • ACK_SN the message sequence number (NACK_SN) not received in the check interval. If the message of a serial number is only partially not received, it also contains the segment start offset position (SOstart) and the end offset position (SOend).
  • the ARQ (Automatic Repeat-ReQuest) in the acknowledgment mode is implemented by the receiver transmitting the Status Report to the sender. The sender receives the acknowledgment number (ACK_SN) in the Status Report, and does not acknowledge.
  • the sequence number (NACK_SN) determines which PDUs have been acknowledged by the receiving end, and which PDUs or PDU fragments need to be retransmitted, thereby ensuring the reliability of data transmission and the normal operation of the service.
  • the receiving end receives a PDU, if the polling finds that the Polling bit is 1, it is considered to be a polling message, and the sender expects to receive a Status Report. After the HARQ Reordering of the PDU is completed, the receiving sliding window is checked and the Status Report is delivered to the opposite end. As shown in Figure 1.
  • the trigger conditions for the receiver to send a status report are as follows: 1.
  • the sender triggers, as shown in Figure 1. That is, the RLC header Polling bit field of the PDU is set to 1.
  • the receiving end receives each PDU, if the polling finds that the Polling bit is 1, it can consider that a Status Report can be sent. After the HARQ Reordering of the PDU is completed, the organized Status Report will be sent to the sender.
  • the sender may set the RLC Head Polling bit field of the PDU to 1 for three reasons:
  • the PDU is the last message sent in the buffer of the sender
  • Receiver trigger as shown in Figure 2. It can only happen for one reason: Receive message reordering (T-Reordering) After the timer expires.
  • a status report prohibition timer (T_Status_prohibit) is set at the receiving end, and the timer is started after each status report is sent, and the timer is run. During the period, it is forbidden to send a status report. No matter how many times the status report is triggered during this period, you need to wait for T-Status_prohibit to timeout before sending the next status 4 report, as shown in Figure 2.
  • the maintenance of the sending sliding window on the transmitting side of the AM RLC entity and the receiving sliding window of the peer peer are mutually restricted.
  • the transmitting side sends a PDU with a P-bit flag to the receiving side
  • the receiving side determines whether to respond to a status report to the transmitting side according to the state of the prohibiting timer reported by the corresponding status.
  • the AM RLC entity on the transmitting side performs data retransmission or shrink transmission window according to the status report content.
  • the receiving side will also respond to a status report to the transmitting side.
  • An object of the embodiments of the present invention is to provide a radio link control layer trigger status report method and a receiving side device, which can dynamically trigger the transmission of a related status report before the sending sliding window is congested, so that the transmitting side can quickly Passing lost data, solving the prior art AM sliding window
  • a method for triggering a status report by a radio link control layer includes:
  • Step 1 The receiving side of the acknowledgment mode entity of the radio link control layer detects the amount of undelivered data in the sliding window of the receiving side, and if the undelivered data amount exceeds the first threshold, the acknowledgment mode entity enters Dynamic adjustment status of the status report;
  • Step 2 In the sending adjustment state, the receiving side of the confirming mode entity determines whether to send a status report according to the first predetermined condition.
  • the first predetermined condition is: Status The timer is disabled, and the alarm is not reported. 01; the number exceeds the second threshold;
  • the receiving side of the acknowledgment mode entity transmits a status report when the first predetermined condition is met.
  • the first predetermined condition is: a status report prohibiting timer not running
  • the receiving side of the acknowledgment mode entity transmits a status report when the first predetermined condition is met.
  • the step 1 further includes: if the acknowledge mode entity is currently in the sending adjustment state, and the undelivered data amount does not exceed the first threshold, the acknowledge mode entity exits the sending adjustment state.
  • the step one specifically includes:
  • Step a the receiving end receives a non-repeating PDU or PDU fragment
  • Step b the receiving end accumulates the total data amount counter, and if it is currently in the sending adjustment state, is also used to calculate the An unreported number counter reporting the number of PDUs is engaged
  • Step C determining whether there is data to be delivered upwards, and if so, obtaining the undelivered data amount by subtracting the delivered quantity from the total data amount; otherwise, using the total data amount as the undelivered data amount;
  • Step d determining whether the undelivered data amount is greater than the first threshold, if it is greater, entering the transmission adjustment state and proceeding to step 2; otherwise, exiting the transmission adjustment state, the unreported number counter clearing Zero and return to step a.
  • the step 2 specifically includes:
  • Step e judging whether the status report prohibits the timer from running, if it is running, executing step f; otherwise, sending a status report, the unreported quantity counter is cleared, and returning to step a;
  • Step f determining whether the number of the unreported PDU exceeds a second threshold, if yes, performing step g; otherwise, returning to step a;
  • Step g stopping the status report prohibiting timer, sending a status report, the unreported quantity counter is cleared, the status report prohibits the timer from being restarted, and returns to step &.
  • the step g further includes: updating the first threshold and the second threshold.
  • a receiving side device for an acknowledgment mode entity of a radio link control layer comprising:
  • a detecting module configured to detect an amount of undelivered data in a sliding window on the receiving side, and if the amount of undelivered data exceeds a first threshold, causing the confirming mode entity to enter a sending adjustment state of the dynamic state report;
  • a determining module configured to determine, according to the first predetermined condition, whether to send a status report in the sending adjustment state.
  • the first predetermined condition is: a status report prohibits the timer from running, and the number of unreported PDUs exceeds a second threshold;
  • the first predetermined condition is: the status report prohibiting timer is not running;
  • the receiving side of the acknowledgment mode entity transmits a status report when the first predetermined condition is met.
  • the detecting module is further configured to: when the acknowledge mode entity is currently in the sending adjustment state, and the undelivered data volume does not exceed the first threshold, the confirm mode entity is caused to exit the sending adjustment state.
  • the invention can dynamically determine whether the entity enters the dynamic adjustment state according to the amount of data in the current AM entity receiving side sliding window, and adjust the transmission of the radio link control layer status report in real time according to other judgment conditions to accelerate the AM transmitting side entity.
  • Retransmission and contraction using the method of the present invention, compared with the prior art, in the case of a small amount of packet loss, the dynamic triggering of the relevant status report is sent before the sending sliding window is congested, so that the transmitting side can be as soon as possible
  • the retransmission of lost data reduces the throughput degradation, delay increase, and service interruption caused by a small number of packets not being received in time or improper timer configuration, improving the user experience.
  • FIG. 1 is a flowchart of triggering a Status Report after a receiving end of an existing RLC protocol layer receives a polling message from a transmitting end;
  • FIG. 2 is a flow chart of an implementation mechanism for starting the T_Status_prohibit timer and prohibiting the transmission of the next status report for a period of time after the first RLC protocol layer receiver sends the first status report;
  • Figure 3 is a flow chart of the steps of the method of the present invention.
  • 4a and 4b are flowcharts showing a specific implementation example of a method for triggering status report of a radio link control layer according to the present invention
  • Fig. 5 is a structural diagram of a receiving mode entity receiving side device according to an embodiment of the present invention. detailed description
  • the method for triggering state 4 of the radio link control layer of the present invention includes: Step 401: A receiving side of an acknowledge mode entity of a radio link control layer detects a non-sliding window in the receiving side Delivering an amount of data, if the amount of undelivered data exceeds a first threshold, the confirmation mode entity enters a transmission adjustment state of the dynamic state report;
  • Step 402 In the sending adjustment state, the receiving side of the confirming mode entity determines whether to send a status report according to the first predetermined condition.
  • the method embodiment of the present invention can dynamically determine whether an entity enters a dynamic adjustment state according to the amount of data in the current AM entity receiving side sliding window, and adjust the transmission of the radio link control layer status advertisement in real time according to other determination conditions. Accelerate the retransmission and shrinkage of the AM transmitting side entity to reduce the business delay or business short-term interruption caused by the stop of the sending sliding window as much as possible, and improve the user experience.
  • the AM mode radio control link entity detects the amount of data that is not sent to the upper layer in the sliding window by the radio link control layer protocol entity and the preset threshold (ie, the first threshold) ) Compare and judge whether to enter the dynamic status report transmission adjustment status.
  • the AM entity after the AM entity enters the dynamic state report transmission adjustment state, if the newly received AM PDU causes the data volume to decrease to a preset threshold due to the sliding of the receiving sliding window, the AM entity exits the dynamic state.
  • the report sends the adjustment status.
  • the AM entity receiving side triggers a dynamic status report. send.
  • the AM entity when the receiving state triggers a dynamic status report by the AM entity, if the T-Status-Prohibit (status report prohibiting timer) is running, the AM entity stops the T-Status-Prohibit timer, and sends a status report. Restart T-Status—Prohibit
  • the AM PDU threshold required to trigger the status report is set to a certain percentage of the initial threshold. The percentage may be 100%, but not only 100%, for example, 70%, 110%, and the like.
  • the receiving end receives a non-repeating PDU or a fragment of the PDU.
  • the receiving end accumulates Exist_PDU_Num (total data amount counter) and determines whether it is in the dynamic status report transmission adjustment state. Yes, the Not-Reprot-PDU-NUM (unreported quantity counter) is accumulated.
  • the Exist_PDU_Num is subtracted from the number of delivered PDUs. And compare the Exist-PDU-Num with the given threshold (the first threshold is set according to the quality requirements of the specific service, and the quality is higher than the second threshold), and if it is less than, the dynamic state report adjustment state is exited.
  • the first threshold is set according to the quality requirements of the specific service, and the quality is higher than the second threshold
  • the dynamic state report adjustment state is exited.
  • the first threshold and the second threshold are set according to different QCI (service quality level identifier) types and bandwidth configurations:
  • QCI service quality level identifier
  • the general principle is set as follows: the sum of the first threshold and the second threshold Cannot be greater than 2 A (SN-1).
  • SN Service quality level identifier
  • Currently there is only one SN configuration, ie SN 10; For example.
  • QBR delay
  • GBR Guard Bit Rate
  • the principle is that the set threshold is proportional to the delay and inversely proportional to the flow.
  • the receiving buffer of the receiving terminal AM RLC entity is detected, and according to the given condition, it is determined whether the receiving entity satisfies the dynamic state report sending adjustment state, and if the triggering condition is met, the state report triggering is performed.
  • FIG. 4 illustrates a specific flowchart of a method for triggering status report of a radio link control layer. The specific process steps are as follows:
  • Step 110 The receiving end receives a non-repeating PDU or a fragment of the PDU, and proceeds to step 120;
  • Step 120 Receiver Exist_PDU_Num (total data amount counter) is accumulated, go to step 130;
  • Step 130 Determine whether the receiving end is in a dynamic state report transmission adjustment state, and if yes, go to step 140, otherwise, go to step 150;
  • Step 140 Not—Report—PDU—NUM (unreported number counter) is accumulated, go to step
  • Step 150 determine whether there is data can be delivered upwards, if there is data can be delivered, go to step 160, otherwise go to step 170;
  • Step 160 Subtract the number of delivered PDUs from Exist_PDU_Num, go to step 170;
  • Step 170 Compare Exist_PDU_Num with a given threshold (ie, the first threshold), and go to step 180. ;
  • Step 180 Determine whether Exist_PDU_Num is greater than a given threshold, if yes, go to step 220, if no, go to 190;
  • Step 190 Exit the transmission adjustment state of the dynamic status report, and go to step 210;
  • Step 210 Not—Report— PDU—NUM is cleared, and returns to step 110;
  • Step 220 Determine whether T_Status_prohibit (status report prohibit timer) is running, if it is, go to step 240, otherwise, go to step 230;
  • Step 230 Trigger a new state 4 to send a message, go to step 210;
  • Step 240 Not-Reprot- PDU-NUM is compared with the given threshold, go to step
  • Step 250 Determine whether the Not-Reprot-PDU-NUM is greater than a given threshold (ie, the second threshold, which is also set according to the quality requirement of the specific service, and the second highest value of the quality is set to be small), if yes, Go to step 260, otherwise, go to step 300;
  • a given threshold ie, the second threshold, which is also set according to the quality requirement of the specific service, and the second highest value of the quality is set to be small
  • Step 260 Stop T_Status_prohibit, go to step 270;
  • Step 270 Send status 4 ,, go to step 280;
  • Step 280 T_Status_prohibit restart, Not_Reprot_PDU_NUM is cleared, go to step 290;
  • Step 290 Update the threshold value to the original threshold value, and go to step 300;
  • Step 300 go to step 110, and continue with other processing.
  • the present invention further provides an embodiment of the receiving side device 500 of the acknowledgment mode entity of the radio link control layer, including:
  • the detecting module 501 is configured to: detect an undelivered data amount in the sliding window on the receiving side, and if the undelivered data amount exceeds the first threshold, enable the confirming mode entity to enter the dynamic state report. Send adjustment status;
  • the determining module 502 is configured to determine, according to the first predetermined condition, whether to send a status report in the sending adjustment state.
  • the first predetermined condition is: the status report prohibits the timer from running, and the number of the unreported protocol data unit PDU exceeds the second threshold; or the first predetermined condition is: the status report prohibiting timer is not running;
  • the receiving side of the acknowledgment mode entity sends a status report when the first predetermined condition is met.
  • the detecting module is further configured to: if the acknowledge mode entity is currently in the sending adjustment state, and the undelivered data volume does not exceed the first threshold, the confirm mode entity is caused to exit the sending adjustment state .
  • the sending side entity triggers the sending of the status report only through the related timer timeout and the POLL_BYTE and the POLL_PDU, and the receiving side entity can only time out through the T-Status-Prohibit. And receiving the polling PDU to trigger the retransmission.
  • the network condition is unstable, the packet loss causes the status report or the polling PDU to be lost, or T-Reordering and T-Polling- restransmit and T-Status-Prohibit are not set.
  • the AM sliding window will not be able to shrink, which will cause the business delay to increase, and even lead to short-term business interruption.
  • the invention can dynamically determine whether the entity enters the dynamic adjustment state according to the amount of data in the current AM entity receiving side sliding window, and adjust the transmission of the radio link control layer status report in real time according to other judgment conditions to accelerate the AM transmitting side entity.
  • Retransmission and contraction using the method of the present invention, compared with the prior art, in the case of a small amount of packet loss, the dynamic triggering of the relevant status report is sent before the sending sliding window is congested, so that the transmitting side can be as soon as possible
  • the retransmission of lost data reduces the throughput degradation, delay increase, and service interruption caused by a small number of packets not being received in time or improper timer configuration, improving the user experience.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention porte sur un procédé et un dispositif côté réception de déclenchement d’un rapport d'état dans une couche de commande de liaison radio. Le procédé comporte les étapes suivantes : 1) un côté réception d'une entité à mode acquitté d'une couche de commande de liaison radio détecte la quantité de données non distribuées dans une fenêtre glissante dudit côté réception, et si la quantité desdites données non distribuées dépasse une première valeur seuil, alors ladite entité à mode acquitté passe dans un état d'ajustement d'envoi de rapports d'état dynamiques ; et 2) dans ledit état d'ajustement d'envoi, ledit côté réception de l'entité à mode acquitté détermine s’il faut envoyer ou non un rapport d'état conformément à une première condition prédéterminée. La présente invention peut déclencher l'envoi de rapports d'état pertinents avant que la fenêtre glissante ne soit congestionnée, permettant ainsi au côté envoi d’envoyer de nouveau les données perdues dès que possible, ce qui résout le problème technique de l'état de la technique selon lequel le retard de service augmente et le service est même interrompu pendant une courte période en raison du fait que la fenêtre glissante de mode acquitté ne peut pas rétrécir au cours du temps.
PCT/CN2010/072686 2009-07-31 2010-05-12 Procédé et dispositif côté réception de déclenchement de rapport d'état dans la couche de commande de liaison radio WO2011012005A1 (fr)

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CN 200910090216 CN101989899B (zh) 2009-07-31 2009-07-31 一种无线链路控制层触发状态报告的方法及接收侧装置
CN200910090216.0 2009-07-31

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CN102957522B (zh) * 2011-08-24 2017-05-10 中兴通讯股份有限公司 一种rlc am状态报告处理的方法和系统
CN103392374B (zh) * 2012-01-06 2016-08-10 华为技术有限公司 数据处理的方法和设备
CN107659959B (zh) * 2016-07-25 2020-10-30 普天信息技术有限公司 一种专网无线通信系统中上报接收数据状态的方法
MX2019009533A (es) * 2017-02-13 2019-09-16 Ericsson Telefon Ab L M Tecnica para monitorear una comunicacion por radio.
CN108566264B (zh) * 2018-04-13 2021-03-16 武汉虹信科技发展有限责任公司 触发无线链路控制层确认模式状态报告的方法及通信系统
CN108650258B (zh) * 2018-05-09 2021-03-02 东南大学 窄带物联网无线链路协议子层am实体数据传输自适应方法
CN112865930A (zh) * 2019-11-27 2021-05-28 上海华为技术有限公司 一种发送轮询报文的方法、相关装置和系统

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CN101453311A (zh) * 2007-11-29 2009-06-10 中兴通讯股份有限公司 一种自动重传请求状态报告的触发方法
CN101483507A (zh) * 2008-01-08 2009-07-15 中兴通讯股份有限公司 基于lte系统的自动请求重传状态报告抑制方法

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CN101483507A (zh) * 2008-01-08 2009-07-15 中兴通讯股份有限公司 基于lte系统的自动请求重传状态报告抑制方法

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