CN102377553A - Data retransmission method and device - Google Patents

Data retransmission method and device Download PDF

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Publication number
CN102377553A
CN102377553A CN2010102655809A CN201010265580A CN102377553A CN 102377553 A CN102377553 A CN 102377553A CN 2010102655809 A CN2010102655809 A CN 2010102655809A CN 201010265580 A CN201010265580 A CN 201010265580A CN 102377553 A CN102377553 A CN 102377553A
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China
Prior art keywords
nack message
pdu
rlc
data
data retransmission
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CN2010102655809A
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Chinese (zh)
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任泰云
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ZTE Corp
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ZTE Corp
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Priority to CN2010102655809A priority Critical patent/CN102377553A/en
Priority to PCT/CN2011/074444 priority patent/WO2012024949A1/en
Publication of CN102377553A publication Critical patent/CN102377553A/en
Pending legal-status Critical Current

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    • 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

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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

The invention provides a data retransmission method and device. The method comprises the step of determining whether to add 1 to the retransmission number of a PDU (Protocol Data Unit) by comparing NACK (Negative Acknowledgement) information received by a RLC (Radio Link Control) layer at a current time with NACK information stored last time. The invention further provides a data retransmission device, comprising a comparing and judging module, which is used for determining whether to add 1 to the retransmission number of the PDU by comparing the NACK information received by the RLC layer at a current time with the NACK information stored last time. According to the invention, the accuracy in retransmission counting of the PDU is ensured; meanwhile, the rebuilding frequency in a data transmission process is reduced, and the system reliability is enhanced.

Description

A kind of data repeating method and device
Technical field
The present invention relates to wireless communication technology field, refer more particularly to the data repeating method and the device of a kind of LTE (Long Term Evolution, Long Term Evolution) system.
Background technology
As shown in Figure 1; RLC (Radio Link Control; Radio Link control) protocol layer is arranged under LTE Radio interface protocols stack PDCP (Packet Data Convergence Protocol, the PDCP) layer, MAC (Media Access Control; The medium access control) on the layer, be a sub-layer that is used for the l2 protocol of mistake recovery and current control in the 3G system.The RLC sublayer is that user service data and control data provide segmentation and retransmission service.The function of RLC sublayer comprises link control, transmits the PDU (Protocol Data Unit, protocol Data Unit) on upper strata (RRC/PDCP), reorganization, segmentation, segmentation and cascade again; Deliver PDU to the upper strata according to the order of sequence, ARQ (Automatic Repeat Request, repetitive requests automatically) error correction; Repeatability detects; Flow control, protocol error detect and repair, RLC reconstruction etc.The function of RLC sublayer is realized by the RLC entity; Each RLC entity can be by RRC (Radio Resource Control; Radio Resource control) being configured to three kinds of patterns is used to carry out transfer of data: transparent mode (TM; Transparent Mode), Unacknowledged Mode (UM, Unacknowledged Mode) and affirmation mode (AM, Acknowledged Mode).In three kinds of patterns; ARQ in the affirmation mode retransmits; Be to transmitting terminal status report (Status Report) through receiving terminal; Transmitting terminal judges that according to the ACK_SN in the status report (Acknowledgement Sequence Number), NACK_SN (NegativeAcknowledgement Sequence Number) which PDU has been received end and has acknowledged receipt of, and which PDU or PDU fragment need to retransmit, thereby guarantee reliability of data transmission.
In the prior art, in the process of rlc layer structure data retransmission, need the number of times that retransmit be added up, when the number of retransmissions of certain PDU reaches peaked, need reach maximum retransmission, rebuild flow process thereby initiate RRC to the rrc layer report.But in the prior art,,, all can be designated as the re-transmission of this PDU, can cause the processing under the situation below unusual like this no matter be that whole PDU retransmits or the re-transmission of PDU burst as long as to the re-transmission of certain PDU.
Suppose that rlc layer is received the scheduling result of MAC layer, the size of TB piece is 8192, RLC according to the size groups of TB piece the PDU of 8192 sizes, and send to the opposite end, note PDU is PDU_1.But this TB piece is lost in transmission course, channel quality variation during this time, after this; The size of the scheduling result TB that MAC gives at every turn all is 100, and RLC retransmits PDU through the PDU_1 structure, and each constructable size is no more than 100; To organize TB then and send to the opposite end,, but need PDU_1 have been accomplished through retransmitting the message transmission even the re-transmission PDU burst after PDU_1 splits can be received in the opposite end at every turn; At least need surpass 80 times and just can distribute, according to the processing mode of existing system, how rlc layer is handled all can surpass maximum retransmission; And the transmission mistake is indicated to rrc layer; Initiate to rebuild flow process, but this is a kind of normal situation, originally should not initiate to rebuild flow process.
Summary of the invention
The present invention will provide a kind of data repeating method and device, to solve rlc layer in the LTE existing system because the deficiency in the data retransmission message construction process, thereby cause the problem of wireless link bandwidth waste.
The invention provides a kind of data repeating method, whether determine the number of retransmissions of PDU is added 1 through this nack message received of RLC relatively and the nack message of preserving last time.
Further; Saidly more specificly be: if the data retransmission size that this nack message of receiving comprises is less than the data retransmission size in the nack message of preserving last time; Then only through nack message structure data retransmission, the number of retransmissions to PDU does not add 1 operation; Otherwise, behind nack message structure data retransmission, the number of retransmissions of this PDU is added 1.
Further, also comprise: after preserving this nack message of receiving, fill the TB piece according to the re-transmission PDU that it is good that the TB information of MAC is used structure, and the TB piece is sent to receiving terminal.
Further, also comprise: also comprise: the RLC transmitter side receives the status report that send the opposite end, obtains nack message through resolving said status report.
Whether the present invention also provides a kind of data re-transmission device, comprises the comparison judging module, be used for determining the number of retransmissions of PDU is added 1 through this nack message received of RLC relatively and the nack message of preserving last time.
Particularly; Said relatively judging module is specially: if the data retransmission size that this nack message of receiving comprises is less than the data retransmission size in the nack message of preserving last time; Then only through nack message structure data retransmission, the number of retransmissions to PDU does not add 1 operation; Otherwise, behind nack message structure data retransmission, the number of retransmissions of this PDU is added 1.
The present invention is to retransmitting when count value adds 1 operation, carried out the comparison with nack message last time, guaranteed retransmitting the correctness of PDU counting; Simultaneously, reduce the frequency of in data transmission procedure, rebuilding, strengthened the reliability of system.
Description of drawings
Fig. 1 is a RLC status report structural representation.
Fig. 2 is that the RLC data retransmission makes up schematic flow sheet.
Fig. 3 is the present invention's one method embodiment flow chart.
Fig. 4 is a data re-transmission apparatus structure sketch map of the present invention.
Embodiment
Whether the present invention is when rlc layer receives that status report structure retransmits message, through the data retransmission size in this nack message of receiving data retransmission size that comprises and nack message of preserving last time relatively, determine the number of retransmissions of this PDU is added 1.Describe the present invention in detail below in conjunction with accompanying drawing and embodiment.
Fig. 2 shows RLC data retransmission of the present invention and makes up flow chart, and is as shown in Figure 2, specifically comprises:
Step 201, the RLC transmitter side receives the status report that send the opposite end.
Step 202, nack message is obtained in the report of RLC parse state;
Step 203, the PDU that obtains this nack message of receiving indication of RLC retransmits the re-transmission partial-length RetransLen_2 of the corresponding nack message indication of length RetransLen_1 partly and preservation last time.
Step 204, the size of RetransLen_1 and RetransLen_2 relatively, if RetransLen_1 less than RetransLen_2 then execution in step 205, otherwise execution in step 206.
Step 205, rlc layer retransmits PDU according to this nack message of receiving structure, preserves the nack message that this is received then, continues execution in step 207 then.
Step 206 retransmits PDU according to this nack message of receiving structure, and the number of retransmissions of the corresponding PDU of this nack message is added 1, preserves the nack message that this is received then, continues execution in step 207 then.
Step 207 is filled the TB piece according to the re-transmission PDU that it is good that the TD information of MAC is used structure, and is sent the TB piece to receiving terminal.
Method embodiment
Fig. 3 shows a kind of data retransmission method embodiment of the present invention; Present embodiment is that the data retransmission with wireless chain control layer in the LTE system is configured to example, at first hypothesis: (1) RLC transmitter side has sent the PDU of 3 8192 sizes, is designated as PDU_1; PDU_2 and PDU3; Because the link reason, this PDU_1 loses in transmission course, and the receiver side of RLC is not received this PDU_1; (2) establishing maximum retransmission is 3.
As shown in Figure 3, the concrete steps of the data retransmission structure of rlc layer are following:
Step 301, RLC transmitter side are received the status report Status_1 that send the opposite end.
Step 302, RLC transmitter side parse state report Status_1 obtains Nack information, and indication PDU_1 integral body is not received.
Step 303, because do not receive nack message last time, the RLC transmitter side is preserved the NACK of PDU_1 get off, and is according to the NACK indication that PDU is whole as re-transmission PDU, and the number of retransmissions Pdu1RetransCount of this PDU is added 1.
Step 304, the RLC transmitter side is received the scheduling result of MAC, the size of TB is 4000.The 1-4000 data division that RLC will retransmit message joins in the TB piece and sends.
Step 305, RLC transmitter side are received the status report Status_2 that send the opposite end.
Step 306, RLC transmitter side parse state report Status_2 obtains Nack information, and indication 4001-8192 byte is not received.
Step 307; The RLC transmitter side compares this NACk information and the nack message of last time; The re-transmission partial-length of nack message indication of finding this is less than the re-transmission partial-length of the nack message indication of last time; Then number of retransmissions Pdu1RetransCount is not added 1 operation, only the 4001-8192 data division structure according to the nack message indication retransmits PDU.Wait for the meeting of MAC dispatcher then.
Step 308, the RLC transmitter side is received the scheduling result of MAC, the size of TB is 5000.The byte that RLC will retransmit the 4001-8192 of message joins in the TB piece and sends.But because the link reason, this TB piece is lost in transmission course, and the receiver side of RLC is not received.
Step 309, RLC transmitter side are received the status report Status_3 that send the opposite end.
Step 310, RLC transmitter side parse state report Status_3 obtains Nack information, and indication 4001-8192 byte is not received.
Step 311; The RLC transmitter side compares this nack message and the nack message of last time, finds that the re-transmission partial-length of this nack message indication equals the re-transmission partial-length of the nack message indication of last time, at first adds 1 operation to number of retransmissions Pdu1RetransCount; Judge that Pdu1RetransCount is 2; Less than 3, do not initiate to rebuild, according to the 4001-8192 data division structure re-transmission PDU of nack message indication.Wait for the meeting of MAC dispatcher then.
Step 312, the RLC transmitter side is received the scheduling result of MAC, the size of TB is 5000.The byte that RLC will retransmit the 4001-8192 of message joins in the TB piece and sends.
Step 313, RLC transmitter side are received the status report Status_4 that send the opposite end.
Step 314, RLC transmitter side parse state report Status_4 finds that PDU_1 receives fully, the nack message that RLC deletion PDU_1 preserves.
Device embodiment
Fig. 4 shows apparatus structure sketch map of the present invention; As shown in Figure 4; This data re-transmission device comprises the comparison judging module, and whether this module is used for determining the number of retransmissions of PDU is added 1 through this nack message received of RLC relatively and the nack message of preserving last time.Particularly, if the data retransmission size that this nack message of receiving comprises is then only constructed data retransmission through nack message less than the data retransmission size in the nack message of preserving last time, the number of retransmissions to PDU does not add 1 operation; Otherwise, behind nack message structure data retransmission, the number of retransmissions of this PDU is added 1.
This data re-transmission device also comprises: memory module is used to preserve the nack message that this is received; Receiver module is used for the RLC transmitter side and receives the status report that send the opposite end; Parsing module is used for RLC and resolves said status report and obtain nack message.
The present invention is to retransmitting when count value adds 1 operation, carried out the comparison with nack message last time, guaranteed retransmitting the correctness of PDU counting; Simultaneously, reduce the frequency of in data transmission procedure, rebuilding, strengthened the reliability of system.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention.

Claims (8)

1. whether a data repeating method is characterized in that, determine the number of retransmissions of protocol Data Unit (PDU) is added 1 through Radio Link control (RLC) this NACK of receiving (NACK) information relatively and the nack message of preserving last time.
2. data repeating method according to claim 1; It is characterized in that; Saidly more specificly be: if the data retransmission size that this nack message of receiving comprises is less than the data retransmission size in the nack message of preserving last time; Then only through nack message structure data retransmission, the number of retransmissions to PDU does not add 1 operation; Otherwise, behind nack message structure data retransmission, the number of retransmissions of this PDU is added 1.
3. data repeating method according to claim 2 is characterized in that, preserve this nack message of receiving after, use the good re-transmission PDU of structure to fill the TB piece according to transmission block (TB) information of medium access control (MAC), and the TB piece sent to receiving terminal.
4. data repeating method according to claim 1 is characterized in that, also comprises: the RLC transmitter side receives the status report that send the opposite end, obtains nack message through resolving said status report.
5. whether a data re-transmission device is characterized in that, comprises the comparison judging module, be used for determining the number of retransmissions of PDU is added 1 through this nack message received of RLC relatively and the nack message of preserving last time.
6. device according to claim 5; It is characterized in that; Said relatively judging module is specially: if the data retransmission size that this nack message of receiving comprises is less than the data retransmission size in the nack message of preserving last time; Then only through nack message structure data retransmission, the number of retransmissions to PDU does not add 1 operation; Otherwise, behind nack message structure data retransmission, the number of retransmissions of this PDU is added 1.
7. device according to claim 6 is characterized in that, also comprises: memory module is used to preserve the nack message that this is received.
8. device according to claim 5 is characterized in that, also comprises: receiver module is used for the RLC transmitter side and receives the status report that send the opposite end; Parsing module is used for RLC and resolves said status report and obtain nack message.
CN2010102655809A 2010-08-26 2010-08-26 Data retransmission method and device Pending CN102377553A (en)

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CN2010102655809A CN102377553A (en) 2010-08-26 2010-08-26 Data retransmission method and device
PCT/CN2011/074444 WO2012024949A1 (en) 2010-08-26 2011-05-20 Data retransmission method and apparatus

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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 (en) * 2009-10-16 2010-04-14 华为技术有限公司 Data retransmission method and device

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 (en) * 2009-10-16 2010-04-14 华为技术有限公司 Data retransmission method and device

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Application publication date: 20120314