WO2012024949A1 - Procédé et appareil de retransmission de données - Google Patents

Procédé et appareil de retransmission de données Download PDF

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Publication number
WO2012024949A1
WO2012024949A1 PCT/CN2011/074444 CN2011074444W WO2012024949A1 WO 2012024949 A1 WO2012024949 A1 WO 2012024949A1 CN 2011074444 W CN2011074444 W CN 2011074444W WO 2012024949 A1 WO2012024949 A1 WO 2012024949A1
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WO
WIPO (PCT)
Prior art keywords
nack information
retransmission
pdu
data
rlc
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/CN2011/074444
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English (en)
Chinese (zh)
Inventor
任泰云
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ZTE Corp
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ZTE Corp
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Filing date
Publication date
Application filed by ZTE Corp filed Critical ZTE Corp
Publication of WO2012024949A1 publication Critical patent/WO2012024949A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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

Definitions

  • the present invention relates to a wireless communication technology, and in particular, to a data retransmission method and apparatus for a Long Term Evolution (LTE) system.
  • LTE Long Term Evolution
  • the Radio Link Control (RLC) protocol layer is located under the Packet Data Convergence Protocol (PDCP) layer in the LTE radio interface protocol stack.
  • PDCP Packet Data Convergence Protocol
  • MAC Media Access Control
  • Above the Access Control layer is a sublayer of Layer 2 protocols for error recovery and flow control in 3G systems.
  • the RLC sublayer 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) Protocol Data Unit (PDU), reassembly, segmentation, re-segmentation and cascading, sequential delivery of PDUs to the upper layer, automatic repeat request (ARQ, Automatic Repeat Request) error correction, repetitive detection, flow control, protocol error detection and repair, RLC reconstruction, etc.
  • RRC Radio Resource Control
  • TM transparent mode
  • UM Unacknowledged Mode
  • AM Acknowledged Mode
  • the ARQ retransmission in the acknowledgment mode is that the receiver sends a status report to the sender, and the sender ACK_SN (Acknowledgement Sequence Number) and NACK-SN (Negative) in the advertisement according to the status. Acknowledgement Sequence Number) 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.
  • the number of retransmissions needs to be If the number of retransmissions of a PDU reaches a maximum, the RRC layer needs to report the maximum number of retransmissions to initiate the RRC reestablishment process. But in the prior art, as long as it is
  • the retransmission of the PDU is recorded as a retransmission of the PDU, which may cause a processing exception in the following cases.
  • the RLC layer receives the scheduling result of the MAC layer, and the size of the TB block is 8192 bytes.
  • the RLC groups 8192 bytes of PDUs according to the size of the TB block and sends them to the peer.
  • the PDU is PDU_1.
  • the TB block is lost during transmission, and the channel quality deteriorates at this time.
  • the size of the scheduling result TB of the MAC is 100 bytes each time, and the RLC constructs a retransmission PDU through the PDU_1, each time the configurable size If the TB is sent to the peer, the peer can receive the retransmitted PDU fragment after the PDU_1 is split, but the PDU_1 needs to be sent through the retransmission packet. After more than 80 times, it can be sent out.
  • the present invention is to provide a data retransmission method and apparatus, which solves the problem that the bandwidth of the radio link is wasted due to the deficiencies in the process of constructing the RLC layer in the LTE existing system due to retransmission of data packets.
  • the present invention provides a data retransmission method for determining whether to increase the number of retransmissions of a PDU by comparing the NACK information received by the RLC with the last saved NACK information.
  • the comparison is specifically: if the size of the retransmission data included in the received NACK information is smaller than the size of the retransmission data in the last saved NACK information, the retransmission data is constructed only by the NACK information, and the PDU is not The number of retransmissions is incremented by one; otherwise, after the retransmission data is constructed by the NACK information, the number of retransmissions of the PDU is incremented by one.
  • the method further includes: after saving the NACK information received this time, according to the TB of the MAC The information fills the TB block with the constructed retransmission PDU and sends the TB block to the receiving end.
  • the method further includes: receiving, by the RLC, the status report sent by the peer end, and obtaining the NACK information by parsing the status report.
  • the present invention further provides a data retransmission apparatus, comprising a comparison decision module, configured to determine whether to increase the number of retransmissions of the PDU by one by comparing the NACK information received by the RLC and the last saved NACK information.
  • a comparison decision module configured to determine whether to increase the number of retransmissions of the PDU by one by comparing the NACK information received by the RLC and the last saved NACK information.
  • the comparison decision module is further configured to: if the size of the retransmission data included in the received NACK information is smaller than the size of the retransmission data in the last saved NACK information, construct the retransmission data only by using the NACK information, The number of retransmissions of the PDU is not increased by one; otherwise, after the retransmission data is constructed by the NACK information, the number of retransmissions of the PDU is incremented by one.
  • the present invention performs comparison with the last NACK information to ensure the correctness of the retransmission PDU count; at the same time, the frequency of reconstruction in the data transmission process is reduced, and the frequency is enhanced. System reliability.
  • Figure 1 is a schematic diagram of the structure of the RLC status report.
  • Figure 2 is a schematic diagram of the RLC retransmission data construction process.
  • FIG. 3 is a flow chart of an embodiment of a method of the present invention.
  • FIG. 4 is a schematic structural view of a data retransmission device of the present invention. detailed description
  • the present invention determines whether the size of the retransmission data included in the NACK information received and the size of the retransmission data in the last saved NACK information is compared when the RLC layer receives the status report constructing the retransmission message.
  • the number of retransmissions of the PDU is increased by one.
  • FIG. 2 is a flowchart of constructing an RLC retransmission data according to the present invention, as shown in FIG. 2, specifically including: Step 201: The RLC sending side receives a status report sent by the opposite end.
  • Step 202 The RLC parses the status report to obtain NACK information.
  • Step 203 Obtain a length RetransLen_l of the PDU retransmission part indicated by the NACK information received by the RLC and a retransmission part length RetransLen_2 indicated by the last saved corresponding NACK information.
  • Step 204 Compare the sizes of RetransLen_l and RetransLen_2. If RetransLen_l 'J is in RetransLen_2, go to step 205. Otherwise, go to step 206.
  • Step 205 The RLC layer constructs a retransmission PDU according to the NACK information received this time, and then saves the NACK information received this time, and then performs step 207.
  • Step 206 Construct a retransmission PDU according to the received NACK information, and add 1 to the retransmission number of the PDU corresponding to the NACK information, and then save the NACK information received this time, and then perform step 207.
  • Step 207 Fill the TB block with the constructed retransmission PDU according to the TD information of the MAC, and send the TB block to the receiving end.
  • FIG. 3 shows an embodiment of a data retransmission method according to the present invention.
  • This embodiment is an example of a retransmission data structure of a radio link control layer in an LTE system.
  • the RLC transmitting side sends Three PDUs of 8192 bytes are recorded as PDU_1, PDU_2 and PDU3. Due to the link, the PDU_1 is lost during transmission, and the receiving side of the RLC does not receive the PDU_1.
  • the maximum number of retransmissions is 3.
  • Step 301 The RLC sending side receives the status report Status_l sent by the peer end.
  • Step 302 The RLC sending side parses the status report Status_l to obtain the Nack information, indicating that the PDU_1 is not received as a whole.
  • Step 303 because the NACK information is not received last time, the RLC transmitting side will PDU_1
  • the NACK is saved, and the PDU as a whole is used as a retransmission PDU according to the NACK indication, and the number of retransmissions of the PDU is PdulRetransCount.
  • Step 304 The RLC sends the scheduling result of the MAC, and the size of the TB is 4000 bytes.
  • the RLC adds the 1-4000 byte data portion of the retransmission 4 bytes to the TB block for transmission.
  • Step 305 The RLC sending side receives the status report Status_2 sent by the peer end.
  • Step 306 The RLC sending side parses the status report Status_2, and obtains the Nack information, indicating that the 4001-8192 bytes are not received.
  • Step 307 The RLC transmitting side compares the current NACk information with the last NACK information, and finds that the length of the retransmission part indicated by the current NACK information is smaller than the length of the retransmission part indicated by the last NACK information, and the number of retransmissions is not PdulRetransCount.
  • the addition operation is performed, and the retransmission PDU is constructed only according to the 4001-8192 byte data portion indicated by the NACK information. Then wait for the MAC scheduling opportunity.
  • Step 308 The RLC sending side receives the scheduling result of the MAC, where the size of the TB is 5000.
  • the RLC adds the bytes of the retransmitted message 4001-8192 to the TB block and sends it out. However, due to the link, the TB block is lost during transmission and the receiving side of the RLC is not received.
  • Step 309 The RLC sending side receives the status report Status_3 sent by the peer.
  • Step 310 The RLC sending side parses the status report Status_3, and obtains the Nack information, indicating that the 4001-8192 bytes are not received.
  • Step 311 The RLC transmitting side compares the current NAC K information with the last NACK information, and finds that the length of the retransmission part indicated by the current NACK information is equal to the length of the retransmission part indicated by the last NACK information, and the number of retransmissions is first.
  • PdulRetransCount performs an operation of adding 1 to determine that PdulRetransCount is 2, less than 3, and does not initiate reconstruction.
  • the retransmitted PDU is constructed according to the 4001-8192 byte data portion indicated by the NACK information. Then wait for the MAC scheduling opportunity.
  • Step 312 The RLC sending side receives the scheduling result of the MAC, where the size of the TB is 5000 bytes. The RLC adds the bytes of 4001-8192 that are retransmitted to the TB block and sends them out. Step 313: The RLC sending side receives the status report Status_4 sent by the peer end.
  • Step 314 the RLC sending side parses the status report Status_4, and finds that the PDU_1 has been completely received, and the RLC deletes the NACK information saved by the PDU_1.
  • the data retransmission device includes a comparison decision module, which is used to compare the NACK information received by the RLC and the last saved NACK information. Whether to increase the number of retransmissions of the PDU by one. Specifically, if the size of the retransmission data included in the received NACK information is smaller than the size of the retransmission data in the last saved NACK information, the retransmission data is constructed only by the NACK information, and the number of retransmissions of the PDU is not increased by one. Operation; Otherwise, after the retransmission data is constructed by the NACK information, the number of retransmissions of the PDU is incremented by one.
  • the data retransmission apparatus further includes: a storage module, configured to save the NACK information received this time; a receiving module, configured to receive, by the RLC transmitting side, a status report sent by the peer end; and a parsing module, configured to perform the RLC parsing the status report NACK information.
  • the present invention performs comparison with the last NACK information to ensure the correctness of the retransmission PDU count; at the same time, the frequency of reconstruction in the data transmission process is reduced, and the frequency is enhanced. System reliability.

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

Abstract

La présente invention porte sur un procédé et un appareil de retransmission de données. Le procédé consiste à : déterminer d'ajouter ou non un au nombre de retransmissions d'unité de données de protocole (PDU) par comparaison des informations d'accusé de réception négatif (NACK) reçues par une commande de liaison radio (RLC) cette fois avec les informations NACK stockées la dernière fois. La présente invention porte également sur un appareil de retransmission de données, qui comprend un module de comparaison et de détermination pour déterminer d'ajouter ou non un au nombre de retransmissions PDU par comparaison des informations NACK reçues par la RLC cette fois avec les informations NACK stockées la dernière fois. Grâce à la présente invention, la précision de comptage du nombre de retransmissions PDU est assurée, et par ailleurs, la fréquence de rétablissement durant le processus de transmission de données est réduite, et la fiabilité du système est améliorée.
PCT/CN2011/074444 2010-08-26 2011-05-20 Procédé et appareil de retransmission de données Ceased WO2012024949A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010265580.9 2010-08-26
CN2010102655809A CN102377553A (zh) 2010-08-26 2010-08-26 一种数据重传方法及装置

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WO2012024949A1 true WO2012024949A1 (fr) 2012-03-01

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090161571A1 (en) * 2007-12-10 2009-06-25 Interdigital Patent Holdings, Inc. Method and apparatus for triggering radio link control packet discard and radio link control re-establishment
CN101695180A (zh) * 2009-10-16 2010-04-14 华为技术有限公司 数据重传方法和装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090161571A1 (en) * 2007-12-10 2009-06-25 Interdigital Patent Holdings, Inc. Method and apparatus for triggering radio link control packet discard and radio link control re-establishment
CN101695180A (zh) * 2009-10-16 2010-04-14 华为技术有限公司 数据重传方法和装置

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