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WO2004112305A1 - Procede et appareil permettant d'ecarter des unites de donnees de services dans un mode accuse de reception d'une rlc dans un systeme de communication sans fil - Google Patents

Procede et appareil permettant d'ecarter des unites de donnees de services dans un mode accuse de reception d'une rlc dans un systeme de communication sans fil Download PDF

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Publication number
WO2004112305A1
WO2004112305A1 PCT/CN2003/000471 CN0300471W WO2004112305A1 WO 2004112305 A1 WO2004112305 A1 WO 2004112305A1 CN 0300471 W CN0300471 W CN 0300471W WO 2004112305 A1 WO2004112305 A1 WO 2004112305A1
Authority
WO
WIPO (PCT)
Prior art keywords
sdu
rlc layer
rlc
discarding
pdus
Prior art date
Application number
PCT/CN2003/000471
Other languages
English (en)
Chinese (zh)
Inventor
Sheng Liu
Baijun Zhao
Yulin Li
Original Assignee
Utstarcom (China) Co. Ltd.
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 Utstarcom (China) Co. Ltd. filed Critical Utstarcom (China) Co. Ltd.
Priority to CNB038264757A priority Critical patent/CN100379192C/zh
Priority to AU2003248218A priority patent/AU2003248218A1/en
Priority to PCT/CN2003/000471 priority patent/WO2004112305A1/fr
Publication of WO2004112305A1 publication Critical patent/WO2004112305A1/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
    • H04L1/1848—Time-out mechanisms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/02—Data link layer protocols

Definitions

  • the present invention generally relates to a related technology of a radio link control (RLC) protocol in a wireless communication system, and particularly relates to an improved service data unit (SDU) discarding method in a wireless communication system RLC protocol.
  • RLC radio link control
  • SDU service data unit
  • Figure 1 shows the WCDMA wireless interface protocol structure.
  • the physical layer PHY
  • PHY physical layer
  • RLC radio link control layer
  • RRC radio resource control
  • MAC media access control layer
  • RLC radio link control layer
  • RRC radio resource control
  • the user plane in addition to the MAC layer and the RLC layer, it also includes a packet data convergence protocol (PDCP) layer and a broadcast / multicast control (BMC) layer.
  • PDCP packet data convergence protocol
  • BMC broadcast / multicast control
  • the channel between the MAC layer and the physical layer is a transmission channel
  • the channel between the MAC layer and the RLC layer is a logical channel.
  • UE end-user equipment
  • the RLC protocol provides segmentation and retransmission services for user and control data.
  • Each RLC entity is configured by RRC into one of three modes: transparent mode (TM), unacknowledged mode (UM), and acknowledged mode (AM).
  • TM mode and UM mode are mainly used for real-time services that are sensitive to delay
  • AM mode is mainly used to transmit non-real-time packet-type services.
  • the PDCP layer can improve the spectrum utilization of wireless transmission through header compression.
  • TCP and UDP In IP networks, the most widely used transport layer protocols are TCP and UDP, non-real-time applications of the interaction type and background type defined in 3GPP, such as WWW (web browsing), email, FTP (file transfer protocol), etc., typically Both use TCP as the transport layer protocol.
  • WWW web browsing
  • FTP file transfer protocol
  • RLC Radio Link Control
  • SDU at the RLC layer corresponds to a TCP / IP packet.
  • the RLC SDU from the upper layer is segmented and / or cascaded into a fixed-length RLC load unit (PU) and an RLC protocol header is added, where the length of the PU is a semi-static parameter, which is Determined when a radio bearer is established or reconfigured.
  • PU fixed-length RLC load unit
  • the typical PU length of a radio bearer for NRT services is 320 bits.
  • MTU Maximum Transmission Unit
  • each RLC layer SDU can be divided into approximately For 15 RLC layer PDUs, if the MTU of the IP packet is 1500 bytes, each RLC layer SDU can be divided into a maximum of about 38 RLC layer PDUs.
  • RLC in AM mode uses Automatic Repeat Request (ARQ) to provide a low error rate radio bearer at the link layer, thereby improving the performance of the TCP protocol in a wireless network.
  • ARQ Automatic Repeat Request
  • the ARQ mechanism increases the transmission delay while ensuring a low error rate.
  • QoS quality of service
  • a large delay will cause the retransmission timer of the TCP sender to time out, which will cause the TCP protocol to mistake the network for congestion and reduce the transmission rate through the flow control function, thereby causing problems such as a decrease in wireless link utilization and service throughput.
  • the service data unit in the radio link control (RLC) protocol is generally used.
  • SDU discard method to complete SDU transmission processing.
  • RLC in AM mode can use one of three SDU discarding methods: timer-based discarding method with explicit signaling, SDU discarding method after MaxDAT retransmissions, and MaxDAT secondary weighting. Do not discard after transmission.
  • the non-discard method after MaxDAT retransmissions will directly trigger the RLC layer reset process after the number of RLC layer PDU retransmissions in an AM mode reaches MaxDAT, so the application range is small.
  • the timer-based discarding method with explicit signaling is as follows: For each SDU from a higher layer, a timer that monitors the transmission time of the SDU is started.
  • the sender will discard the SDU. And, if part of the SDU has been sent, the sender will use the in-band control command of the mobile receive window (MRW) to make the receive window and receive buffer of the receiver updated accordingly.
  • MMW mobile receive window
  • the SDU discarding method after MaxDAT retransmissions is the opposite of the timer-based discarding method with explicit signaling.
  • the SDU discarding method after MaxDAT retransmissions is based on the judgment of whether the corresponding retransmission number of one PDU reaches the predetermined maximum number of MaxDATs to trigger the discarding of SDUs.
  • one SDU often corresponds to multiple PDUs, and the probability of unsuccessful MaxDAT retransmissions of one PDU will be much lower than the total number of retransmissions of each PDU corresponding to one SDU reaches MaxDAT. The probability.
  • the RLC receiver needs to wait for all RLC layer PDUs corresponding to an SDU to be completely successfully received, it can reassemble the SDU and submit it to the upper layer. In this way, the technology based on the current protocol specification is retransmitted after MaxDAT times.
  • the SDU discarding method cannot effectively control the delay of SDU transmission, because once the total number of retransmissions of a PDU corresponding to an SDU is too high, but when the number of retransmissions of each PDU is lower than MaxDAT, a large delay will occur. It may cause the retransmission timer of the TCP sender to expire, thereby causing the TCP protocol to make incorrect control over the sending rate.
  • a method for discarding a service data unit (SDU) in a radio link control (RLC) protocol confirmation mode of a wireless communication system includes the following steps: A) The RLC layer SDU from the upper layer protocol is segmented and concatenated to form each RLC layer protocol data unit (PDU) corresponding to the SDU;
  • each RLC layer PDU corresponding to the SDU is initially transmitted and / or retransmitted to the peer layer by the RLC layer sender functional entity one by one, and determines whether the predetermined condition for discarding the SDU is satisfied according to the status information from the peer layer;
  • step B) if the predetermined discard condition is satisfied, discard the SDU; otherwise, step B) is performed continuously without interruption until all RLC layer PDUs corresponding to the SDU are successfully sent to the peer end receiving end;
  • the predetermined discard condition in step B) is that the total number of retransmissions of a maximum of n RLC layer PDUs corresponding to the SDU exceeds a predetermined threshold, where n> 2 but less than or equal to the total number of RLC layer PDUs of the SDU.
  • the predetermined threshold value corresponds to the predetermined discard condition.
  • a segmentation and cascade processing device is configured to process an RLC layer SDU from an upper layer protocol to form each RLC layer protocol data unit (PDU) corresponding to the SDU;
  • a sending device is configured to each RLC layer PDU corresponding to the SDU Initial transmission and / or retransmission to the peer layer by the RLC layer sender functional entity one by one;
  • a determining device configured to determine whether a predetermined condition for discarding the SDU is satisfied according to status information from a peer layer
  • the discarding device is configured to discard the SDU when the predetermined discarding condition is satisfied; otherwise, the sending device performs initial and / or retransmission of each RLC layer PDU corresponding to the SDU without interruption until the SDU All corresponding RLC layer PDUs are successfully sent to the peer end.
  • the predetermined discard condition is that the total number of retransmissions of a maximum of n RLC layer PDUs corresponding to the SDU exceeds a predetermined threshold, where n> 2 but less than or equal to the The total number of RLC layer PDUs of the SDU, and wherein the predetermined threshold value corresponds to the predetermined discarding condition.
  • a wireless communication system which includes a core network (CN), a radio access network (UTRAN), a terminal user equipment (UE), and is used in a radio link control (RLC) protocol.
  • CN core network
  • UTRAN radio access network
  • UE terminal user equipment
  • RLC radio link control
  • RLC radio link control
  • the sender of the RLC layer counts the total number of retransmission times of all PDUs corresponding to the upper-layer SDU. Once the total number of retransmission times reaches a predetermined threshold, the sender will discard the SDU and For all PDUs corresponding to the SDU in the sending window, at the same time, the sending end will update the receiving window and receiving buffer of the receiving end by using the MRW in-band control command in the same manner as in the prior art.
  • the number of retransmission times of those PDUs that include other SDU partial segments in addition to the partial segment containing the SDU It should also be counted.
  • the present invention can not only ensure that the SDU discarding rate is not affected by the channel rate, and can prevent excessive delay variation to a certain extent.
  • 1 is a schematic diagram of a wireless interface protocol structure in a WCDMA wireless communication system
  • 2 is a schematic diagram of segmentation and concatenation of RLC layer SDUs in an RLC wireless protocol confirmation mode (AM mode);
  • AM mode RLC wireless protocol confirmation mode
  • Fig. 4 is a detailed flowchart of step S40 in the flowchart shown in Fig. 3. detailed description
  • FIG. 3 shows a flowchart of a specific embodiment of the SDU discarding method according to the present invention by using an SDU sending process as an example.
  • step S20 the RLC layer SDU from the upper layer protocol first enters the segment and cascade processing unit of the AM mode RLC layer sender, and after processing by this unit, each RLC layer PDU corresponding to the SDU is formed.
  • step S30 the counter Counter_ReTrans, which counts the total number of retransmission times of each RLC layer PDU corresponding to the SDU, is cleared.
  • the SDIJ discard method is used to complete the sending process of the SDU.
  • step S50 the sending process of the SDU ends, and as a result, the SDU may be discarded, or the SDU may be successfully sent to the peer end.
  • FIG. 4 describes the processing performed in step S40 of FIG. 3 in more detail.
  • the sender of the RLC layer PDU determines whether there is an RLC layer PDU corresponding to the SDU that needs to be retransmitted according to the status information from the peer layer generated during the transmission of the SDU. If retransmission is not required, then it is determined in step S160 whether all RLC layer PDUs corresponding to the SDU have been successfully transmitted to the peer end. If the determination result is "Yes", then the sending process of the SDU is ended (step S50), otherwise, it continues to wait for the next transmission from the peer layer Status information.
  • step S110 the retransmission counter Counter_ReTrans, that is, Coimter ReTrans_Counter_ReTrans + k is updated, where k is the number of RLC layer PDUs that need to be retransmitted.
  • step S120 it is determined whether the value of the counter Counter_ReTrans exceeds a predetermined threshold value TotalMaxDAT?
  • the predetermined threshold is the maximum total number of retransmissions allowed for each RLC layer PDU corresponding to the SDU corresponding to the SDU discard condition.
  • step S120 If the value of the counter Counter_ReTrans exceeds the predetermined threshold, the SDU is discarded in steps S130 and S140, and the sender uses the MRW in-band control command to make the receive window and receive buffer of the peer end corresponding. Update. And the sender discards the SDU, including discarding the backup of the SDU retained at the sender and all PDUs corresponding to the SDU in the sending window. If it is determined in step S120 that the value of the counter Counter_ReTrans does not exceed the predetermined threshold TotalMaxDAT, then retransmission processing is performed in step S170, that is, the transmitting end retransmits the RLC layer PDU in the status information indicating that retransmission is required.
  • the predetermined threshold TotalMaxDAT in this embodiment is determined in advance according to the requirements of the SDU discarding rate to be met and the requirement to prevent excessive delay changes, so it can be easily changed according to actual needs.
  • the flowchart of FIG. 4 draws the retransmission processing of the corresponding RLC layer PDUs in a separate box (S170) for the sake of clarity, those skilled in the art should understand that in actual implementation, The retransmission of the RLC layer PDU corresponding to the SDU that needs to be retransmitted at a certain state information, and the initial transmission and / or retransmission of other RLC layer PDUs corresponding to the SDU are performed simultaneously. That is, the other RLC layer PDUs may only include the RCL layer PDUs of the SDU that need to be transmitted initially, and may be a combination of the RCL layer PDUs to be transmitted initially and the RLC layer PDUs that are determined to need retransmission in the previous processing.
  • RLC layer PDUs may also be that the other RLC layer PDUs have been successfully sent to the receiving end of the peer layer. In this case, only the Only the RLC layer PDUs that need to be retransmitted for re-transmission processing are needed. In addition, among the RLC layer PDUs that are determined to be retransmitted as described above, some may even be RLC layer PDUs that have been retransmitted multiple times.
  • each RLC layer PDU (including the initial transmission and the RLC layer PDU that needs to be retransmitted) corresponding to the SDU will be performed continuously without interruption, even if step S100 is performed , S110, S120, S160 and S170 without interruption.
  • the status information from the peer layer mentioned in step S100 is transmitted from the peer layer to the transmitting end.
  • the transmission of status information can be started in multiple ways, for example, when the polling bit of the data PDU (AMD PDU) is 1 "; or the timer-based status PDU transmission function is used, and the timer Timer_Status- Periodic timeout, etc. Etc.
  • the transmission of status information may also be delayed, for example when the status PDU disable function is used.
  • the specific form of status information transmission mechanism used depends on the specific implementation of the system. Therefore, the counter mentioned in step S110 Counter- ReTrans update step may be 1 "(transmit status information whenever it is determined that an RLC layer PDU needs to be retransmitted), or any integer greater than 1 and less than or equal to the total number of RLC layer PDUs corresponding to the SDU (depending on For the time interval of status information transmission and the number of RLC layer PDUs determined to be retransmitted in the time interval). It should be noted here that the content described in the text of this paragraph is well known in the communication field, and is not critical for implementing the SDU discarding method of the present invention.
  • the SDU discarding method of the present invention counts the total number of retransmissions of a maximum of n RLC layer PDUs of the SDU, where n is greater than or equal to 2 and less than or equal to the total number of RLC layer PDUs corresponding to the SDU. Then, it is judged whether the obtained value of the total number of retransmissions exceeds a certain predetermined threshold, so as to determine whether a condition for discarding the SDU is satisfied.
  • n takes an integer corresponding to the number of all RLC layer PDUs corresponding to the SDU, which is equivalent to the total number of retransmissions of all RLC layer PDUs corresponding to the SDU. Count and judge.
  • the selection of the n RLC layer PDUs may be various.
  • the corresponding at least n RLC layer PDUs may be either consecutive n PDTJs or spaced n PDUs. Count and judge the retransmission times of the n corresponding RLC layer PDUs with even or odd bits, and so on.
  • the foregoing prior art SDU discarding method based on the number of retransmissions of a single RLC layer PDU of the SDU and the foregoing maximum of n RLC layers corresponding to the SDU in the present invention may also be used.
  • the SDU discard method of the total retransmission times of PDUs is applied in combination. As long as the SDU discard condition in any discard method is met, the corresponding SDIL is discarded
  • PDUs that include other SDU partial segments in addition to the partial segment containing the SDU should also be counted.
  • those PDUs that contain other SDU partial segments in addition to the partial segments containing the SDU should not be dropped.
  • the SDU for the concatenation and segmentation processing of the SDU, it is determined that the SDU is discarded after meeting the predetermined discarding conditions of the SDU, and it is determined that the preemption of the SDU is not satisfied.
  • the steps of initially transmitting and / or retransmitting each RLC layer PDU of the SDU without discontinuity when determining the discarding conditions are the same as the corresponding steps described above with reference to FIG. 3 and FIG. 4, and therefore are not repeated here.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Communication Control (AREA)

Abstract

L'invention concerne un procédé permettant d'écarter des unités de données de services dans un mode accusé de réception d'une commande de liaison radio (RLC) dans un système de communication sans fil. Ce procédé comprend les étapes suivantes : A) traitement des SDU dans la couche RLC depuis la couche de protocole la plus élevée, l'unité de données de protocole dans chaque couche RLC étant ensuite formée ; B) les PDU dans chaque couche RLC correspondant aux SDU sont transmises et/ou retransmises de manière primitive sur la couche homologue, et sont évaluées de façon à savoir si elles remplissent des conditions prédéterminées d'écartement des SDU ; C) si les conditions prédéterminées d'écartement des SDU sont remplies, alors les SDU sont écartées, dans le cas contraire l'étape B) est répétée en continu par l'étape C) ; les conditions prédéterminées étant que les temps de transmission totaux dépassent une valeur prédéterminée, n étant supérieur ou égal à 2, et inférieur ou égal au nombre total des PDU dans la couche RLC desdites SDU. L'invention concerne également un dispositif et un système correspondant audit procédé. Le procédé et le dispositif de l'invention permettent d'assurer que le débit de canal n'influence pas le rapport d'écartement des SDU, et empêche l'apparition de changement de retard trop long.
PCT/CN2003/000471 2003-06-18 2003-06-18 Procede et appareil permettant d'ecarter des unites de donnees de services dans un mode accuse de reception d'une rlc dans un systeme de communication sans fil WO2004112305A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CNB038264757A CN100379192C (zh) 2003-06-18 2003-06-18 无线链路控制协议确认模式中服务数据单元的丢弃方法及其装置
AU2003248218A AU2003248218A1 (en) 2003-06-18 2003-06-18 Method and apparatus for discarding the service data units in the acknowledgement mode of the rlc in the wireless communications system
PCT/CN2003/000471 WO2004112305A1 (fr) 2003-06-18 2003-06-18 Procede et appareil permettant d'ecarter des unites de donnees de services dans un mode accuse de reception d'une rlc dans un systeme de communication sans fil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2003/000471 WO2004112305A1 (fr) 2003-06-18 2003-06-18 Procede et appareil permettant d'ecarter des unites de donnees de services dans un mode accuse de reception d'une rlc dans un systeme de communication sans fil

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CN1330155C (zh) * 2005-08-24 2007-08-01 华为技术有限公司 无线链路控制乱序传输功能中协议数据单元数据处理方法
CN100407611C (zh) * 2006-02-21 2008-07-30 华为技术有限公司 移动通信网络中分组数据传输速率的控制方法及其系统
WO2009145420A1 (fr) * 2008-03-31 2009-12-03 Samsung Electronics Co., Ltd. Procédé et système pour mettre au rebut des unités de données dans un système de communication mobile
WO2010149075A1 (fr) * 2009-12-10 2010-12-29 中兴通讯股份有限公司 Procédé de traitement d'acquittement et station de base
US9641655B2 (en) 2007-10-01 2017-05-02 Interdigital Patent Holdings, Inc. Method and apparatus for PCDP discard

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WO2009086679A1 (fr) * 2007-12-29 2009-07-16 Zte Corporation Procédé de commande de réinitialisation d'entité de commande de liaison hertzienne
US20090175175A1 (en) * 2008-01-04 2009-07-09 Interdigital Patent Holdings, Inc. Radio link control reset using radio resource control signaling
CN102469511A (zh) * 2010-11-15 2012-05-23 中兴通讯股份有限公司 一种分组数据汇聚协议层处理数据的方法及系统
CN103763314B (zh) * 2014-01-06 2017-01-11 南京信息工程大学 实际部署的跌倒检测系统中用户层数据的处理方法及装置
WO2019023862A1 (fr) * 2017-07-31 2019-02-07 Oppo广东移动通信有限公司 Procédé de traitement de données et produit associé à celui-ci
CN110011925B (zh) * 2018-01-04 2022-09-13 维沃移动通信有限公司 一种sdu的处理方法和通信设备

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1330155C (zh) * 2005-08-24 2007-08-01 华为技术有限公司 无线链路控制乱序传输功能中协议数据单元数据处理方法
CN100407611C (zh) * 2006-02-21 2008-07-30 华为技术有限公司 移动通信网络中分组数据传输速率的控制方法及其系统
US9641655B2 (en) 2007-10-01 2017-05-02 Interdigital Patent Holdings, Inc. Method and apparatus for PCDP discard
US10630819B2 (en) 2007-10-01 2020-04-21 Interdigital Patent Holdings, Inc. Method and apparatus for PCDP discard
WO2009145420A1 (fr) * 2008-03-31 2009-12-03 Samsung Electronics Co., Ltd. Procédé et système pour mettre au rebut des unités de données dans un système de communication mobile
WO2010149075A1 (fr) * 2009-12-10 2010-12-29 中兴通讯股份有限公司 Procédé de traitement d'acquittement et station de base

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CN1771685A (zh) 2006-05-10
CN100379192C (zh) 2008-04-02

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