WO2012000312A1 - Procédé et dispositif pour établir un rapport d'état - Google Patents

Procédé et dispositif pour établir un rapport d'état Download PDF

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Publication number
WO2012000312A1
WO2012000312A1 PCT/CN2011/070530 CN2011070530W WO2012000312A1 WO 2012000312 A1 WO2012000312 A1 WO 2012000312A1 CN 2011070530 W CN2011070530 W CN 2011070530W WO 2012000312 A1 WO2012000312 A1 WO 2012000312A1
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WO
WIPO (PCT)
Prior art keywords
pdu
received
sequence number
pdus
constructing
Prior art date
Application number
PCT/CN2011/070530
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English (en)
Chinese (zh)
Inventor
任泰云
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
Publication date
Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2012000312A1 publication Critical patent/WO2012000312A1/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
    • H04L1/1607—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
    • 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
    • H04L1/1628—List acknowledgements, i.e. the acknowledgement message consisting of a list of identifiers, e.g. of sequence numbers

Definitions

  • the present invention relates to the field of wireless communications, and in particular, to a method and apparatus for constructing a state of a radio link control layer protocol entity in an LTE (Long Term Evolution) system.
  • LTE Long Term Evolution
  • the RLC (Radio Link Control) protocol layer is located under the PDCP (Packet Data Convergence Protocol) layer in the LTE radio interface protocol stack, above the MAC (Media Access Control) layer. , is a sublayer of layer 2.
  • the RLC layer provides segmentation and retransmission services for user service data and control data.
  • the functions of the RLC sublayer include link control, delivery of upper layer (RRC/PDCP) PDUs (Protocol Data Units), reassembly, segmentation, re-segmentation and cascading, and sequential delivery of PDUs to the upper layer, ARQ ( Automatic Repeat-reQuest, automatic retransmission request) error correction, repetitive detection, flow control, protocol error detection and repair, RLC reconstruction, etc.
  • RLC Radio Resource Control
  • TM Transparent Mode
  • UM Unconfirmed Mode
  • AM Acknowledged Mode
  • the ARQ retransmission in the acknowledge mode is to send a status report to the sender through the receiver.
  • the sender acknowledges the ACK_SN (Acknowledgement Sequence Number) and NACK SN (Negative Acknowledgement Sequence) according to the status. Number, unacknowledged response sequence number) to determine which PDUs have been acknowledged by the receiving end, which PDUs or PDU fragments need to be retransmitted, thus ensuring the reliability of data transmission.
  • ACK_SN Acknowledgement Sequence Number
  • NACK SN Negative Acknowledgement Sequence
  • the status report needs to be constructed on the RLC receiving side according to the protocol parameters VR(R) and VR(MS), but in the case where the packet loss is serious, VR(R) and VR(MS) may be There will be many PDUs not received.
  • constructing a status report by VR(R) and VR(MS) protocol parameters will make the status report very large, and the RLC transmitting side receives the status report.
  • the Nack (unacknowledged response) information in the status report is processed, and the retransmission PDU is assembled.
  • the Nack information is too much, the Nack information in the status report may not be processed yet.
  • the receiving side sends a status report.
  • the receiving side will repeatedly send the Nack that has not been received by the PDU corresponding to the Nack information in the previous status report. This will compare the channel quality. When it is bad, it wastes a lot of upstream bandwidth.
  • the technical problem to be solved by the present invention is to provide a method and apparatus for constructing a status report to save data transmission bandwidth.
  • the present invention provides a method for constructing a status report, which is applied to a radio link control layer protocol entity, and includes:
  • the received protocol data unit (PDU) is parsed with a polling flag, or the local reordering timeout expires, the minimum sequence number and the maximum sequence number of the PDU that are not completely received are obtained;
  • the minimum sequence number and the maximum number of the PDUs that are not completely received are The unacknowledged response information of the predetermined number of PDUs that are not completely received is obtained between the serial numbers, and is used to construct a state 4 report.
  • the foregoing method further has the following feature: acquiring, between the minimum sequence number and the maximum sequence number of the PDU that is not completely received, the unacknowledged response information of the predetermined number of PDUs that are not completely received,
  • the steps used to construct the status report include:
  • Unconfirmed response information of the predetermined number of incompletely received PDUs is obtained in order from the smallest sequence number of the incompletely received PDUs for constructing the status report.
  • the foregoing method further has the following feature: acquiring, between the minimum sequence number and the maximum sequence number of the PDU that is not completely received, the unacknowledged response information of the predetermined number of PDUs that are not completely received,
  • the steps for constructing the status report also include:
  • the foregoing method further has the following features: the PDU that is not completely received is: an unreceived PDU or a partially received PDU.
  • the above method has the following features: If the PDU that is not completely received is a PDU that is not received, the unacknowledged response information is a sequence number corresponding to the unreceived PDU;
  • the unacknowledged response information is a sequence number corresponding to the PDU received by the part and information indicating a start position and an end position of the unreceived part.
  • the present invention further provides an apparatus for constructing a status report, which is applied to a radio link control layer protocol entity, including:
  • Obtaining a module configured to obtain a minimum sequence number and a maximum sequence number of the PDU that is not completely received if the received protocol data unit (PDU) is parsed with a polling flag bit, or the local reordering timing expires;
  • the determining module is connected to the acquiring module, and the determining module is configured to: if it is determined that the number of PDUs that are not completely received between the maximum sequence number and the minimum sequence number of the PDU that is not completely received is greater than a predetermined number, Then the message notification construction module;
  • Constructing a module connected to the determining module, the constructing module is configured to: after receiving the notification, obtain the predetermined number between the minimum serial number and the maximum serial number of the incompletely received PDU The unacknowledged response information of the received PDU is used to construct a status report.
  • the above device also has the following features:
  • the constructing module is configured to acquire unconfirmed response information of the predetermined number of incompletely received PDUs in order from the smallest sequence number of the incompletely received PDU.
  • the above device also has the following features:
  • the constructing module is further configured to: after acquiring the unacknowledged response information of the predetermined number of incompletely received PDUs, acquire the next PDU of the corresponding maximum sequence number of the predetermined number of incompletely received PDUs
  • the serial number is used as a confirmation response message for constructing a status report.
  • the above device also has the following features:
  • the PDU that is not completely received is: a PDU that is not received or a PDU that is partially received. If the PDU that is not completely received is a PDU that is not received, the unacknowledged response information is that the acknowledgment is not received. Serial number corresponding to the PDU; If the PDU that is not completely received is a partially received PDU, the unacknowledged response information is a sequence number corresponding to the PDU received by the part and information indicating a start position and an end position of the unreceived part.
  • the present invention provides a method and apparatus for constructing a status report, which solves the LTE existing system
  • the RLC layer status report is insufficient in the construction process to improve the efficiency of the RLC status report, thereby saving the bandwidth of the wireless link.
  • the present invention has the following advantages: 1) saving data transmission bandwidth; 2) reducing repeated transmission of Nack information in the status report; 3) because Nack information is reduced in the status report, The complexity of the RLC transmitting side parsing status report is reduced; 4) the complexity of the RLC receiving side configuration status report is reduced.
  • FIG. 1 is a schematic diagram of an apparatus for constructing a state report according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a method for constructing a status report according to an embodiment of the present invention
  • FIG. 3 is a flow chart of an application example of a method of constructing a status report of the present invention.
  • FIG. 1 is a schematic diagram of an apparatus for constructing a status report according to an embodiment of the present invention.
  • the apparatus for constructing a status report in this embodiment is applied to an RLC protocol entity.
  • the method may include: an obtaining module 11, a determining module 12, and a constructing module. 13. among them,
  • the obtaining module 11 is configured to: if the received PDU is parsed with a predetermined flag bit, or the local timing expires, obtain a minimum sequence number and a maximum sequence number of the PDU that is not completely received;
  • the determining module 12 is connected to the obtaining module 11 and configured to: if it is determined that the number of PDUs that are not completely received between the maximum sequence number and the minimum sequence number of the incompletely received PDU is greater than a predetermined number, the message is Notification construction module 13;
  • a constructing module 13 connected to the judging module 12, configured to receive the notification, in the The unconfirmed response information of the predetermined number of PDUs that are not completely received is obtained between the minimum sequence number of the PDU that is not completely received and the maximum sequence number, and is used to construct a status report.
  • the constructing module 13 acquires the unconfirmed response information of the predetermined number of incompletely received PDUs in order from the smallest sequence number of the incompletely received PDU, and may further acquire the reservation
  • the sequence number of the next PDU of the corresponding maximum sequence number in the PDU that is not completely received is used as the acknowledgment response information for constructing the status report.
  • the PDU that is not completely received may include: a PDU that is not received and a PDU that is partially received. If the PDU that is not completely received is a PDU that is not received, the constructing module 13 acquires the PDU that is not received. The PDU corresponding to the PDU is configured to construct a status report; if the PDU that is not completely received is a partially received PDU, the constructing module 13 obtains the sequence number corresponding to the PDU received by the part and the unreceived part of the tag. Information on the start and end positions to construct a status report.
  • FIG. 2 is a flowchart of a method for constructing a status report according to an embodiment of the present invention. As shown in the figure, the method in this embodiment includes the following steps:
  • step S10 Analyze whether the received PDU has a polling flag, or determine whether the local rescheduling timing expires. If the PDU has a polling flag, or the local rescheduling timing expires, then go to step S20, if the PDU is not carried. If the flag bit is queried and the local timing has not expired, the PDU is always received, and step S10 is repeated.
  • the RLC receiving side receives the PDU with the Poling bit sent by the peer end, that is, the Polling flag bit in the parsing PDU is 1, which triggers the RLC receiving side construction status report.
  • the RLC receivers After receiving a certain number of PDUs, the RLC receivers will sort the PDUs and deliver the PDUs to the upper layer in sequence. When the local t-Reordering timer expires, the RLC receiver will trigger the status report structure of the PDUs that are not received. .
  • the RLC receiving side acquires the protocol parameters VR(R) and VR(MS) of the local end.
  • the VR(R) records the minimum sequence number of the PDU that was not completely received
  • the VR (MS) records the maximum sequence number of the PDU that was not completely received.
  • step S30 Determine whether the number of PDUs that are not completely received between the maximum sequence number and the minimum sequence number of the PDU that are not completely received is greater than a predetermined number. If the number of PDUs is greater than the predetermined number, the process proceeds to step S40. If it is less than or equal to the predetermined number, then proceeds to step S50;
  • the RLC receiving side calculates the number of PDUs that are not completely received between VR(R) and VR(MS), NACK_NUM.
  • the RLC receiving side judges whether NACK_NUM is greater than the maximum number of NACK information allowed per status report NACK_MAX.
  • step S40 Acquire unconfirmed response information of the predetermined number of incompletely received PDUs between the minimum sequence number and the maximum sequence number of the incompletely received PDU, for constructing a status report, and then proceed to step S60.
  • the RLC receiving side acquires NACK-MAX Nack information between VR(R) and VR(MS), and SN of the next PDU of the corresponding maximum sequence number in the NACK_MAX incompletely received PDUs Construct a status report as AckSn.
  • AckSn indicates that in the status report, except for the PDU indicated by NackSn, the PDUs before AckSn have been received.
  • step S40 the RLC receiving side can specifically obtain the unacknowledged response information of the NACK_MAX incompletely received PDUs with the smallest sequence number to construct a status report.
  • the unacknowledged response information of NACK-MAX PDUs that are not completely received is obtained in order from VR(R).
  • NackSn For a PDU that is not received at all, only the Sn number of the PDU is required as NackSn; for a part of the received PDU, NackSn and the unstarted part's start position (Sostart) and end position (SoEnd) are required to construct the Nack information.
  • step S50 Use all unacknowledged response information between the minimum sequence number and the maximum sequence number of the incompletely received PDU to construct a status report, and then proceed to step S60.
  • the RLC receiving side reports all Nack information construction status between VR(R) and VR(MS), and uses the next sequence number of the sequence number of the VR (MS) record as AckSn (Acknowledgement Response Sequence Number). Construct state 4 obituary.
  • S60 send status report.
  • the present invention will be further described in detail below by taking the status report configuration of the radio link control layer in the LTE system as an example.
  • the transmitting side of the RLC layer has sent 200 PDUs to the receiving side of the RLC layer, which is recorded as PDU-1 to PDU-200, and the serial number of the PDU is 1 -200.
  • the VR (MS) protocol parameter at the receiving side is updated to 201. Assuming that PDU-0 is not received, the protocol parameter VR(R) is 0.
  • the maximum number of NACK messages configured in the background is 20.
  • the receiving side of the RLC receives the PDU, and the Polling flag in the PDU is 1 or the retake timer expires.
  • the RLC receiving side obtains the protocol parameter VR(R) is 0, and VR(MS) is 201.
  • the number of PDUs not received between VR(R) and VR(MS) is, for example, 199.
  • the RLC receiving side determines that the number of PDUs not received is greater than the maximum number of NACKs allowed in the status report configured in the background.
  • the RLC layer receiving side obtains a NACK information construction status report of the 20 unreceived PDUs (l-20) with the smallest SN number, and constructs a status report by using SN (21) as an ACK_SN.
  • the RLC layer receiving side sends a status report to the transmitting side of the RLC layer.
  • the present invention provides a method and apparatus for constructing a status report, which saves data transmission bandwidth by:
  • the received protocol data unit (PDU) is parsed with a polling flag, or the local reordering timing expires, the minimum sequence number and the maximum sequence number of the PDU that are not completely received are obtained;
  • the number of PDUs that are not completely received between the maximum sequence number and the minimum sequence number of the PDU is greater than a predetermined number, and the reservation is obtained between the minimum sequence number and the maximum sequence number of the incompletely received PDU.
  • the unacknowledged response information of the PDUs that are not completely received is used to construct a status report.
  • the method and device provided by the present invention solve the problem in the process of constructing the RLC layer status report in the existing LTE system, improve the efficiency of the RLC status report, and save the bandwidth of the wireless link.

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

Abstract

La présente invention concerne un procédé et un dispositif pour établir un rapport d'état. Le procédé comprend les étapes suivantes : si l'unité de données de protocole reçue (PDU) est résolue et s'il est déterminé qu'elle contient un bit de signe d'interrogation, ou si la temporisation de réorganisation locale est dépassée, obtention du numéro de séquence maximum et du numéro de séquence minimum des PDU reçues incomplètes; s'il est déterminé que le nombre de PDU reçues incomplètes entre le numéro de séquence maximum et le numéro de séquence minimum des PDU reçues incomplètes est supérieur à un nombre prédéterminé, obtention d'une information de confirmation négative d'un nombre prédéterminé de PDU reçues incomplètes entre le numéro de séquence minimum et le numéro de séquence maximum des PDU reçues incomplètes de manière à établir le rapport d'état. La présente invention corrige les imperfections dans le processus d'établissement d'un rapport d'état sur la couche de commande de liaison radio (RLC) dans le système antérieur d'évolution à long terme (LTE) et améliore l'efficacité de l'établissement du rapport d'état RLC, ce qui permet d'économiser la largeur de bande des liaisons sans fil.
PCT/CN2011/070530 2010-07-01 2011-01-24 Procédé et dispositif pour établir un rapport d'état WO2012000312A1 (fr)

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CN2010102214435A CN102315915A (zh) 2010-07-01 2010-07-01 一种构造状态报告的方法与装置

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WO2014075284A1 (fr) * 2012-11-16 2014-05-22 华为技术有限公司 Procédés de retour d'informations et retransmission de données, et appareil correspondant
US10849160B2 (en) * 2019-02-26 2020-11-24 Nokia Technologies Oy Reinstating poll retransmission timer

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WO2014110786A1 (fr) * 2013-01-18 2014-07-24 华为技术有限公司 Procédé et dispositif de transmission de données
CN107872842B (zh) * 2016-09-27 2021-01-15 中国移动通信有限公司研究院 一种数据接收方法及装置
CN108809526B (zh) * 2017-05-05 2020-11-27 展讯通信（上海）有限公司 Rlc层的状态报告方法及装置、存储介质、用户设备
CN114339614B (zh) * 2020-09-29 2023-07-28 上海朗帛通信技术有限公司 一种被用于无线通信的方法和设备

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WO2014075284A1 (fr) * 2012-11-16 2014-05-22 华为技术有限公司 Procédés de retour d'informations et retransmission de données, et appareil correspondant
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US10849160B2 (en) * 2019-02-26 2020-11-24 Nokia Technologies Oy Reinstating poll retransmission timer

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