WO2004112407A1 - Procede de commande d'une fenetre d'envoi d'une couche de liaison radio - Google Patents

Procede de commande d'une fenetre d'envoi d'une couche de liaison radio Download PDF

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Publication number
WO2004112407A1
WO2004112407A1 PCT/CN2004/000573 CN2004000573W WO2004112407A1 WO 2004112407 A1 WO2004112407 A1 WO 2004112407A1 CN 2004000573 W CN2004000573 W CN 2004000573W WO 2004112407 A1 WO2004112407 A1 WO 2004112407A1
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WO
WIPO (PCT)
Prior art keywords
rlc
information
window size
window
timer
Prior art date
Application number
PCT/CN2004/000573
Other languages
English (en)
Chinese (zh)
Inventor
Qian Wang
Jia Dong
Rong Shi
Original Assignee
Zte Corporation
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 Zte Corporation filed Critical Zte Corporation
Publication of WO2004112407A1 publication Critical patent/WO2004112407A1/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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/187—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
    • H04L1/1867—Arrangements specially adapted for the transmitter end
    • H04L1/1896—ARQ related signaling

Definitions

  • the present invention relates to wireless link control in a cellular mobile communication system, and more particularly, to a method for controlling a transmission window of a wireless link layer.
  • the radio link control (RLC) protocol is a sliding window-based control protocol used to control the transmission of radio link data packets.
  • the block with a crossed diagonal line at the RLC sender means that the peer has confirmed Packets that have not been received and need to be resent.
  • Shaded squares indicate packets that are waiting for acknowledgement from the peer, blank squares indicate no buffers are occupied; squares with crossed slashes at the RLC receiver indicate that the peer has lost transmission and needs to be re-received Of the data packets, the shaded squares indicate data packets that have been received, and the blank squares indicate no buffers are occupied.
  • Tx-Window-Size It is the initial value of the sending window configured by the upper protocol layer to the RLC sender, and it is also the maximum size of the sending window; the unit is expressed by the number of PDUs in the protocol data unit; the RLC sender requests a send buffer according to this variable .
  • VT (S): is the transmission status variable, which indicates the sequence number of the next protocol data unit PDU to be transmitted, excluding the retransmitted protocol data unit PDU.
  • VT (A): is the acknowledgement state variable, which indicates the sequence number of the next consecutive protocol data unit PDU waiting to be acknowledged by the receiver.
  • VT (WS) represents the size of the sending window, and its initial value is also the maximum value Configured_Tx_Window_Size, the minimum value is 1 or other upper-layer configured values, and VT (WS) changes within this range.
  • VR (R) is the reception status variable, which indicates the sequence number of the next consecutive protocol data unit PDU to be received.
  • VR (H) is the highest expected reception state variable, which indicates the sequence number of the highest protocol data unit PDU expected to be received.
  • the RLC receiver informs the RLC sender that some packets have been received and some packets are not received through the status packet PDU.
  • the RLC sender receives these status packet PDUs, it changes the acknowledgement status variable VT (A). Value, thereby pushing forward the maximum transmission state variable VT (MS) to ensure that data is continuously transmitted.
  • the value of the transmission state variable VT (S) will increase continuously until The value of the maximum transmission state variable VT (MS) is reached, and then data with a sequence number greater than or equal to the maximum transmission state variable VT (MS) is no longer transmitted.
  • the RLC receiver detects that a certain protocol data unit PDU has not been received, as shown by the cross-hatched block at the RLC receiver, the value of the highest expected reception state variable VR (H) will increase continuously until it reaches The maximum allowable state variable VR (MR), and then no longer receive data with a serial number greater than or equal to the maximum allowable state variable VR (MR). It is stipulated in the existing protocol that the RLC receiving end controls the window size of the data sent by the RLC sending end according to its own receiving buffer, thereby controlling the bandwidth usage of the wireless link.
  • the method is to send a status packet PDU containing the window size indication (Window Size SUFI) information to the RLC sender.
  • the structure of the Window Size SUFI information is as follows:
  • the length of TYPE is 4 bits, when TYPE-0001, it means the window WINDOW; the length of WSN is 12 bits, which is used to change the size of the send window of the RLC sender.
  • the RLC sender When the RLC sender receives the Window Size SUFI message, it changes the size of the send window VT (WS) to WSN. If the WSN is equal to 0, the SUFI information is discarded; if the WSN is greater than the maximum transmission window size Configured_Tx_Window_Size, the size of the transmission window VT (WS) is taken as Configured_Tx_Window_Size.
  • the wireless link deteriorates, data loss may occur, causing the RLC receiver to increase its cache.
  • the RLC receiver uses Window Size SUFI information to reduce the data sent by the RLC sender, and notifies the RLC sender to reduce the size of the send window. VT (WS), thereby reducing the sending window and avoiding data congestion.
  • the Window Size SUFI message informs the RLC sender to increase the size of the send window VT (WS), thereby increasing the send window and avoiding a decrease in the bandwidth utilization efficiency of the data link.
  • the PDU drop rate of some non-real-time data services can reach 10%.
  • the drop rate specified by the RLC protocol does not exceed 0.7%, so the probability of window size SUFI information loss is higher.
  • Window Size SUFI information is critical to the bandwidth use of the wireless link, but RLC The protocol does not provide protection for such a critical message to ensure that the RLC sender can receive the message.
  • the triggering mechanism of different Window Size SUFI information has different effects on the bandwidth utilization efficiency of wireless links.
  • the triggering method generally used is: the remaining space of the receiving buffer Relative change ratio trigger mode and fixed-point trigger mode.
  • the RLC receiver Especially when the wireless link transitions from a bad state to a good state, the RLC receiver requires the RLC sender to increase the Window Size SUFI information of the send window size only once. Once this information is lost, the send window cannot be adjusted, especially When the wireless quality becomes better and the packet loss rate decreases, the RLC receiver will no longer trigger the Window Size SUFI message. During this period, even if the wireless link is good, the sending window will still maintain the state when the link is bad. Wireless link Sending data at a very low rate causes a serious drop in the speed of the wireless link.
  • the technical problem to be solved by the present invention is to provide a wireless link layer transmission window control method, which effectively overcomes the prior art when the Window Size SUFI information is lost, the RLC receiving end cannot know whether the transmitting end receives the transmission window adjustment information, The inability to continue to send Window Size SUFI information to adjust the sending window causes a defect that the bandwidth use efficiency of the radio link control protocol is reduced.
  • the method for controlling a transmission window of a wireless link layer includes the following steps: Step 1.
  • the RLC receiving end sets a timer;
  • Step 2 The RLC receiver detects whether a Window Size SUFI message is triggered. If a Window Size SUFI message is triggered, it sends a Window Size to the RLC sender. SUFI information, start timer;
  • Step 3 After receiving the Window Size SUFI information, the RLC sender sends a response message to the RLC receiver;
  • Step 4 The RLC receiver detects whether the correct response message is received during the timer. If the correct response message is received, the timer is stopped. Otherwise, the Window Size SUFI message is triggered, and the process returns to step 2.
  • the response information sent by the RLC sender to the RLC receiver includes WSN information in the Window Size SUFI information received by the RLC sender.
  • the RLC receiver After receiving the response information, the RLC receiver parses the WSN information in it, and if it is consistent with the WSN information in the Window Size SUFI information sent last time, it is regarded as the correct response information.
  • the receiving status of the Window Size SUFI information is fed back to the receiving end in time by the response information. Even if the Window Size SUFI information is lost, the Window Size SUFI information can continue to be sent, and the sending window can be adjusted in time to effectively avoid the decline in the efficiency of the wireless link control protocol bandwidth usage .
  • Figure 1 is a schematic diagram of a radio link control protocol
  • FIG. 2 is a schematic diagram of a conventional RLC receiving end notifying an RLC sending end to change a sending window size through a status packet PDU including Window Size SUFI information;
  • FIG. 3 is a flowchart of an RLC transmitting end in the method of the present invention.
  • FIG. 4 is a flowchart of the RLC receiving end in the method of the present invention.
  • the present invention receives Window by setting Window Ack SUFI as the RLC sender. After the Size SUFI message is returned to the RLC receiver, the RLC receiver can learn and resend the Window Size SUFI message even if the Window Size SUFI message is lost.
  • composition of the Window Ack SUFI message is as follows:
  • the length of the WSN is 12 bits, which is set to the WSN value in the latest Window Size SUFI information received.
  • the specific steps of the RLC sender in the method of the present invention are as follows:
  • Step 1 The RLC sender checks whether it has received the Window Size SUFI message sent by the RLC receiver. If it receives, it goes to step 2; otherwise, it continues to detect.
  • Step 2 The RLC sender parses the WSN value in the received Window Size SUFI information, and sets the WSN in the Window Ack SUFI information to this value.
  • Step 3 The RLC sender sends the Window Ack SUFI information to the RLC receiver. Go to step 1.
  • the specific steps of the RLC receiving end in the method of the present invention are as follows:
  • Step 1 Set the timer Timer_Window_Ack on the RLC receiver.
  • the timer can be set to any value from 100ms to 2000ms.
  • Step 2 The RLC receiver detects whether a Window Size SUFI message is triggered. If yes, go to step 3; otherwise, go to step 4.
  • Step 3 The RLC receiver sends Window Size SUFI information and starts the timer Timer_Window_Ack. Go to step 5.
  • Step 4 The RLC receiver detects whether the Tinier_Window_Ack timer is running. If it is not running, go to step 2. Otherwise, go to step 5. Step 5. If the RESET process occurs at the RLC receiving end, go to step 10; otherwise, go to step 6.
  • Step 6 Determine whether the timer Timer_Window-Ack has timed out. If it is timed out, go to step 9; otherwise, go to step 7.
  • Step 7 The RLC receiver detects whether there is a new Window Size SUFI message to be sent. If it has, go to Step 9, otherwise go to Step 8.
  • Step 8 The RLC receiver checks whether it has received the correct Window Ack SUFI information. If it receives, go to step 10; otherwise, go to step 9.
  • Step 9 Trigger Window Size SUFI message, go to step 2.
  • the window size SUFI information is triggered by setting a trigger flag on the RLC receiver.
  • Step 10 Stop the timer Timer—Window—Ack. Go to step 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Communication Control (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de commande d'une fenêtre d'envoi d'une couche de liaison radio comprenant un récepteur RLC détectant s'il y a une activité d'information SUFI de taille fenêtre, le cas échéant, le récepteur envoie l'information SUFI de taille de fenêtre au module d'envoi RLC ce qui fait démarrer le temporisateur. Après réception de l'information SUFI, le module d'envoi RLC envoie l'information de réponse au récepteur RLC ; ce dernier détecte s'il a reçu l'information de réponse correcte pendant la période du temporisateur, le cas échéant, il arrête le temporisateur sinon il active l'information SUFI. La présente invention renvoie l'information reçue de l'information SUFI au récepteur dans le temps au moyen de l'information de réponse même si l'information SUFI se perd, l'information SUFI sera envoyée en continu pour régler la fenêtre d'envoi, éviter la diminution de la largeur de bande du protocole de commande de liaison radio de manière efficace.
PCT/CN2004/000573 2003-06-12 2004-05-31 Procede de commande d'une fenetre d'envoi d'une couche de liaison radio WO2004112407A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN03126873.0 2003-06-12
CN 03126873 CN1275401C (zh) 2003-06-12 2003-06-12 无线链路层发送窗口的控制方法

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WO2004112407A1 true WO2004112407A1 (fr) 2004-12-23

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050041586A1 (en) * 2003-08-24 2005-02-24 Sam Shiaw-Shiang Jiang Method of controlling a receiver and a transmitter in a wireless communication system to handle a transmission window size change procedure
TWI501601B (zh) * 2011-08-15 2015-09-21 Mediatek Inc 裝置搜尋的處理方法
CN110019398B (zh) * 2017-12-14 2022-12-02 北京京东尚科信息技术有限公司 用于输出数据的方法和装置

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20020014938A (ko) * 2000-08-19 2002-02-27 서평원 래디오 링크 콘트롤 (ｒｌｃ)에서 프로토콜 데이터유닛(ｐｄｕ) 정보의 표현방법 및 그 구조
CN1337832A (zh) * 2000-08-07 2002-02-27 Lg电子株式会社 用于控制通信系统中数据流的方法
CN1339903A (zh) * 2000-08-19 2002-03-13 Lg电子株式会社 在无线电链路控制的协议数据单元中插入长度指示符的方法

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1337832A (zh) * 2000-08-07 2002-02-27 Lg电子株式会社 用于控制通信系统中数据流的方法
KR20020014938A (ko) * 2000-08-19 2002-02-27 서평원 래디오 링크 콘트롤 (ｒｌｃ)에서 프로토콜 데이터유닛(ｐｄｕ) 정보의 표현방법 및 그 구조
CN1339903A (zh) * 2000-08-19 2002-03-13 Lg电子株式会社 在无线电链路控制的协议数据单元中插入长度指示符的方法

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CN1567767A (zh) 2005-01-19
CN1275401C (zh) 2006-09-13

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