CN102201901A - Data retransmission method and device - Google Patents
Data retransmission method and device Download PDFInfo
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- CN102201901A CN102201901A CN2010101388957A CN201010138895A CN102201901A CN 102201901 A CN102201901 A CN 102201901A CN 2010101388957 A CN2010101388957 A CN 2010101388957A CN 201010138895 A CN201010138895 A CN 201010138895A CN 102201901 A CN102201901 A CN 102201901A
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
- H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
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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
- H04L1/1887—Scheduling and prioritising arrangements
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Abstract
The invention discloses a data retransmission method and device. The data retransmission method comprises the following steps of: setting a data retransmission threshold value of a radio link control (RLC) layer; judging whether the free space of a transport block (TB) is smaller than the data retransmission threshold value; and retransmitting retransmission data of the RLC layer by using a new TB. By setting the data retransmission threshold value of the RLC layer, inappropriate de-clustering of the retransmission data is avoided, the length of a PDU (Protocol Data Unit) is controlled effectively, the uplink and downlink data transmission bandwidths are saved, and the processing complexity of RLC retransmission data is lowered.
Description
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 (LongTerm Evolution, Long Term Evolution) system.
Background technology
RLC (Radio Link Control, Radio Link control) protocol layer is arranged in LTE Radio interface protocols stack PDCP (Packet Data Convergence Protocol, PDCP) under the layer, MAC (Media Access Control, the medium access control) on the layer, be a sublayer that is used for the l2 protocol of mistake recovery and current control in the 3G system.The RLC sublayer provides segmentation and retransmission service for user service data and control data.The function of RLC sublayer comprises link control, transmits PDU (the Protocol Data Unit on upper strata (RRC/PDCP), protocol Data Unit), 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) by receiving terminal, transmitting terminal judges that according to the ACK_SN in the status report (Acknowledgement Sequence Number), NACK_SN (Negative Acknowledgement Sequence Number) which PDU has been received end and has acknowledged receipt of, which PDU or PDU fragment need to retransmit, thereby guarantee reliability of data transmission.
The transfer of data of affirmation mode uses RLC AM PDU to carry out usually, and the structure of a kind of RLCAM PDU as shown in Figure 1.Prior art can split down according to the unbounded size of bandwidth when retransmitting message.But, can cause like this when remaining bandwidth is less than certain value, split later cost greater than the cost that does not split.For example, 3 bytes of bandwidth left are given TB (TransportBlock, transmission block) piece if split the data of 3 bytes from retransmit message, and then rlc layer can cause DMAC data of many 2 byte of DMAC layer when data are passed to the DMAC layer.Therefore, rlc layer when send to retransmit message next time, in the Segment structure of RLC AM PDU, the SO of 2 bytes how, as shown in Figure 2.If SOstart and 4 bytes of SOend field in the status report structure that needs to increase behind this burst are as shown in Figure 3 received in the opposite end, in order to send the data of 3 bytes, and increased the downlink data of 2 bytes, increase the upstream data of 4 bytes, wasted the bandwidth of uplink and downlink Radio Links.
Summary of the invention
Main purpose of the present invention is to 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.
According to an aspect of the present invention, provide a kind of data repeating method, having comprised: Radio Link control rlc layer data re-transmission threshold value has been set; The free space of judging transmission block TB is less than the data re-transmission threshold value; Use new TB to retransmit the data retransmission of rlc layer.
Further, the step that rlc layer data re-transmission threshold value is set comprises: the byte number that takies that obtains the offset byte of rlc layer protocol Data Unit PDU; The data re-transmission threshold value is set more than or equal to described byte number.
Further, described data repeating method also comprises: the free space of judging TB is greater than the data re-transmission threshold value, and greater than the length of data retransmission; Use the data retransmission of the free space re-transmission rlc layer of TB.
Further, described data repeating method also comprises: the free space of judging TB is greater than the data re-transmission threshold value, and less than the length of data retransmission; From data retransmission, split out length and be less than or equal to the sub-data retransmission of free space; Use the free space of TB to retransmit sub-data retransmission.
Further, the span of data re-transmission threshold value is the 4-8 byte.
According to a further aspect in the invention, provide a kind of data re-transmission device, having comprised: module has been set, is used to be provided with Radio Link control rlc layer data re-transmission threshold value; First judge module is used to judge that the free space of transmission block TB is less than the data re-transmission threshold value; First retransmission module is used to use new TB to retransmit the data retransmission of rlc layer.
Further, module is set comprises: acquisition module is used to obtain the byte number that takies of the offset byte of rlc layer protocol Data Unit PDU; Threshold value is provided with module, is used to be provided with the data re-transmission threshold value more than or equal to described byte number.
Further, described data re-transmission device also comprises: second judge module, the free space that is used to judge TB be greater than the data re-transmission threshold value, and greater than the length of data retransmission; Second retransmission module is used to use the free space of TB to retransmit the data retransmission of rlc layer.
Further, described data re-transmission device also comprises: the 3rd judge module, the free space that is used to judge TB be greater than the data re-transmission threshold value, and less than the length of data retransmission; Split module, be used for splitting out the sub-data retransmission that length is less than or equal to institute's free space from data retransmission; The retransmission module is used to use the free space of TB to retransmit sub-data retransmission.
Further, the span of data re-transmission threshold value is the 4-8 byte.
The present invention has avoided the inappropriate fractionation of data retransmission by rlc layer data re-transmission threshold value is set, and has effectively controlled the length of PDU, has saved the up-downgoing data transfer bandwidth, has reduced the complexity that the RLC data retransmission is handled.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of a kind of RLC AM PDU of prior art;
Fig. 2 is the structural representation of a kind of RLC AM PDU Segment of prior art;
Fig. 3 is a kind of RLC status report structure chart of prior art;
Fig. 4 is the flow chart of steps of a kind of data repeating method embodiment of the present invention;
Fig. 5 is the flow chart of steps of another kind of data repeating method embodiment of the present invention;
Fig. 6 is the flow chart of steps of another data repeating method embodiment of the present invention;
Fig. 7 is the structured flowchart of a kind of data re-transmission device embodiment of the present invention;
Fig. 8 is the structured flowchart of another kind of data re-transmission device embodiment of the present invention.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
With reference to Fig. 4, show the flow chart of steps of a kind of data repeating method embodiment of the present invention, specifically can may further comprise the steps:
Step 401: Radio Link control rlc layer data re-transmission threshold value is set;
The data re-transmission threshold value can be set to the byte number that the offset byte more than or equal to RLC AM PDU takies, perhaps the byte number that takies more than or equal to the offset byte of RLC status report structure.Those skilled in the art can be provided with flexibly according to actual conditions under the principle of saving the upstream and downstream bandwidth resource, and the present invention need not make restriction to this.
Step 403: the idle length of judging transmission block TB is less than the data re-transmission threshold value;
Step 405: use new TB to retransmit the data retransmission of rlc layer.
When the free space of TB during less than the data re-transmission threshold value, then abandon using this TB to retransmit the data retransmission of rlc layer, use than the nose heave biography small data quantity of quality paper data avoiding, cause bandwidth waste.
Prior art is when data retransmission, even the free space of TB is less, but still data retransmission can be split, and be filled in this free space.But, can cause the byte number of data occupancy of transmission less like this, the byte of header of message then takies more byte number, thereby causes the waste of data transfer bandwidth.By present embodiment, can solve the deficiency of LTE system rlc layer data retransmission message structure in the prior art, effectively save the up-downgoing data transfer bandwidth, reduce the complexity that the RLC data retransmission is handled.
With reference to Fig. 5, show the flow chart of steps of another kind of data repeating method embodiment of the present invention.Present embodiment is an example with the data retransmission of rlc layer in the LTE system, according to the existing techniques in realizing mode, when the data re-transmission threshold value is not set, in downlink data, the offset byte of the PDU of the RLC of 2 bytes of meeting waste, and in upstream data, then can waste the PDU offset byte of 4 RLC.
Therefore, when the data re-transmission threshold value is set, at first obtain the shared byte number of offset byte of the PDU of RLC, and then the data re-transmission threshold value is set more than or equal to the shared byte number of the offset byte of the PDU of RLC according to this byte number.In the present embodiment, the shared byte number of offset byte that at first obtains the PDU of RLC is 2 or 4 bytes, and the span that the data re-transmission threshold value then can be set is 4 to 8 bytes, is example to select 5 bytes.The byte number that takies by the offset byte according to PDU is provided with the data re-transmission threshold value, and algorithm is simple, and it is convenient to realize, also makes the setting of data re-transmission threshold value more reasonable.The span that the data re-transmission threshold value is set is 4 to 8 bytes, can adapt to the data re-transmission of present stage rlc layer preferably, for those skilled in the art provide reference is set preferably, and certainly, those skilled in the art also can suitably be provided with as required.
Supposing has three data retransmission nodes in the retransmission queue of RLC, is respectively DATA-1, DATA-2, and DATA-3, length is respectively 500 bytes, 800 bytes, 300 bytes.The data re-transmission of present embodiment specifically can may further comprise the steps:
Step 501:RLC receives the scheduling result of MAC layer, and this can retransmit the space of TB.
In the present embodiment, this space length that retransmits the TB piece is 1303 bytes.
Step 503: judge whether data are arranged in the retransmission queue, if nothing, then process ends; If have, then execution in step 505.
Step 505: from retransmission queue, obtain a data retransmission node.
Step 507: whether the free space of judging TB is greater than the data length of data retransmission node, if then execution in step 509; If not, execution in step 511 then.
Step 509: the data retransmission of data retransmission node is copied among the TB, change step 503.
Step 511: whether the free space of judging TB is less than the data re-transmission threshold value, if then execution in step 513; If not, execution in step 515 then.
Step 513: use new TB copy data retransmission.
Step 515: split the data retransmission node, idle TB is filled up, send this TB.
In the present embodiment, this space length that retransmits the TB piece is 1303 bytes.At first, from retransmission queue, obtain data retransmission node DATA-1.The data length of DATA-1 is 500 bytes, less than the length of TB, DATA-1 is copied in the TB piece.The free space that calculates TB is 803 bytes, greater than data re-transmission threshold value 5 bytes.From retransmission queue, obtain second data retransmission node DATA-2.The data length of DATA-2 is 800 bytes, less than the free space of TB, DATA-2 is copied in the TB piece, and the free space that calculates TB is 3 bytes.The free space of judging TB is less than data retransmission threshold value 5 bytes, and this retransmits the end of message structure, retransmits the data of this TB.
Then, RLC receives the scheduling result once more of MAC, and the space length that retransmits the TB piece once more is 1000 bytes.RLC obtains retransmission node DATA-3 from retransmission queue.The data length of DATA-3 is 300 bytes, less than the space length that retransmits TB once more, the data of DATA-3 is copied in the TB piece, and calculating the free space that retransmits TB once more is 700 bytes.Judge the free space that retransmits TB once more greater than data re-transmission threshold value 5 bytes, continuation copies new data retransmission to and retransmits TB once more, after this being retransmitted once more TB filling completely, retransmits this and retransmits TB once more.
By present embodiment,,, directly data retransmission is copied among the TB and retransmit and during greater than the data re-transmission threshold value at the free space of TB greater than the length of data retransmission, effectively improved data re-transmission speed and efficient.
With reference to Fig. 6, show the flow chart of steps of another data repeating method embodiment of the present invention.Present embodiment is an example with the data retransmission of rlc layer in the LTE system still, and selecting the data re-transmission threshold value is 5 bytes.Supposing has three data retransmission nodes in the retransmission queue of RLC, is respectively DATA-1, DATA-2, and DATA-3, length is respectively 500 bytes, 800 bytes, 300 bytes.
The data re-transmission of present embodiment specifically can may further comprise the steps:
Step 601:RLC receives the scheduling result of MAC layer, and this space that retransmits TB is 1503 bytes.
Step 603: from retransmission queue, obtain a data retransmission node DATA-1.The data length of DATA-1 is 500 bytes, less than the space length of TB, DATA-1 is copied in the TB piece, and the free space that calculates TB is 1003 bytes.
Step 605: from retransmission queue, obtain second data retransmission node DATA-2.The data length of DATA-2 is 800 bytes, less than the free space of TB, DATA-2 is copied in the TB piece, and the free space that calculates TB is 203 bytes.
Step 607: the free space of judging TB is greater than data retransmission threshold value 5 bytes, but less than data length 300 bytes of DATA-3.
Step 609: DATA-3 is split as two parts, and the first sub-data retransmission partly equals free space 203 bytes of TB, and the remaining second sub-data retransmission partly is 97 bytes.
Step 611: the first sub-data retransmission of DATA-3 is copied among the TB, retransmit this TB.
Step 613:RLC receives the scheduling result once more of MAC, and the space length that retransmits TB once more is 1000 bytes.
Step 615:RLC obtains the second sub-data retransmission of retransmission node DATA-3 from retransmission queue, it is copied among the TB, and calculating the free space that retransmits TB once more is 903 bytes.
Step 617: continuation copies new data retransmission to and retransmits TB once more, retransmits this and retransmits TB once more.
By present embodiment,, and during less than the length of data retransmission, this data retransmission is rationally split greater than the data re-transmission threshold value at the free space of TB, improved data re-transmission speed and efficient.
With reference to Fig. 7, show the structured flowchart of a kind of data re-transmission device embodiment of the present invention, specifically can comprise:
By present embodiment, can solve the deficiency of LTE system rlc layer data retransmission message structure in the prior art, effectively save the up-downgoing data transfer bandwidth, reduce the complexity that the RLC data retransmission is handled.
With reference to Fig. 8, show the structured flowchart of another kind of data re-transmission device embodiment of the present invention, specifically can comprise:
Module 801 is set, is used to be provided with Radio Link control rlc layer data re-transmission threshold value.
Preferably, the span of described data re-transmission threshold value can be the 4-8 byte.
Preferably, module 801 is set can be comprised: acquisition module 8011 is used to obtain the byte number that takies of the offset byte of rlc layer PDU; Threshold value is provided with module 8013, is used to be provided with the data re-transmission threshold value more than or equal to described byte number.
First judge module 803 is used to judge that the free space of transmission block TB is less than the data re-transmission threshold value.
First retransmission module 805 is used to use new TB to retransmit the data retransmission of rlc layer.
Preferably, described data re-transmission device can further include:
Second judge module 807, the free space that is used to judge TB be greater than the data re-transmission threshold value, and greater than the length of data retransmission.
Second retransmission module 809 is used to use the free space of TB to retransmit the data retransmission of rlc layer.
Preferably, described data re-transmission device can further include:
The 3rd judge module 811, the free space that is used to judge TB be greater than the data re-transmission threshold value, and less than the length of data retransmission.
Retransmission module 815 is used to use the free space of TB to retransmit sub-data retransmission.
The acquisition module 8011 that module 801 is set obtains the byte number that takies of the offset byte of rlc layer PDU.Threshold value is provided with module 8013 and according to this byte number the data re-transmission threshold value is set, and this data re-transmission threshold value is more than or equal to described byte number.During data re-transmission, if first judge module 803 is judged the free space of TB less than the data re-transmission threshold value, then first retransmission module 805 uses new TB to retransmit the data retransmission of rlc layer; If second judge module 807 is judged the free space of TB greater than the data re-transmission threshold value, and greater than the length of data retransmission, then second retransmission module 809 uses the free space of TB to retransmit the data retransmission of rlc layer; If the 3rd judge module 811 judges that the free space of TB is greater than the data re-transmission threshold value, and length less than data retransmission, then split module 813 and split out the sub-data retransmission that length is less than or equal to free space from data retransmission, retransmission module 815 uses the free space of TB to retransmit this sub-data retransmission.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, and in some cases, can carry out step shown or that describe with the order that is different from herein, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a data repeating method is characterized in that, comprising:
Radio Link control rlc layer data re-transmission threshold value is set;
The free space of judging transmission block TB is less than described data re-transmission threshold value;
Use new TB to retransmit the data retransmission of described rlc layer.
2. method according to claim 1 is characterized in that, the described step that rlc layer data re-transmission threshold value is set comprises:
Obtain the byte number that takies of the offset byte of described rlc layer protocol Data Unit PDU;
Described data re-transmission threshold value is set more than or equal to described byte number.
3. method according to claim 1 is characterized in that, described method also comprises:
The free space of judging described TB is greater than described data re-transmission threshold value, and greater than the length of described data retransmission;
Use the free space of described TB to retransmit the data retransmission of described rlc layer.
4. method according to claim 1 is characterized in that, described method also comprises:
The free space of judging described TB is greater than described data re-transmission threshold value, and less than the length of described data retransmission;
From described data retransmission, split out length and be less than or equal to the sub-data retransmission of described free space;
Use the free space of described TB to retransmit described sub-data retransmission.
5. method according to claim 1 is characterized in that, the span of described data re-transmission threshold value is the 4-8 byte.
6. a data re-transmission device is characterized in that, comprising:
Module is set, is used to be provided with Radio Link control rlc layer data re-transmission threshold value;
First judge module is used to judge that the free space of transmission block TB is less than described data re-transmission threshold value;
First retransmission module is used to use new TB to retransmit the data retransmission of described rlc layer.
7. device according to claim 6 is characterized in that, the described module that is provided with comprises:
Acquisition module is used to obtain the byte number that takies of the offset byte of described rlc layer protocol Data Unit PDU;
Threshold value is provided with module, is used to be provided with described data re-transmission threshold value more than or equal to described byte number.
8. device according to claim 6 is characterized in that, also comprises:
Second judge module, the free space that is used to judge described TB be greater than described data re-transmission threshold value, and greater than the length of described data retransmission;
Second retransmission module is used to use the free space of described TB to retransmit the data retransmission of described rlc layer.
9. device according to claim 6 is characterized in that, also comprises:
The 3rd judge module, the free space that is used to judge described TB be greater than described data re-transmission threshold value, and less than the length of described data retransmission;
Split module, be used for splitting out the sub-data retransmission that length is less than or equal to described free space from described data retransmission;
The retransmission module is used to use the free space of described TB to retransmit described sub-data retransmission.
10. device according to claim 6 is characterized in that, the span of described data re-transmission threshold value is the 4-8 byte.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101388957A CN102201901A (en) | 2010-03-22 | 2010-03-22 | Data retransmission method and device |
| PCT/CN2010/076030 WO2011116577A1 (en) | 2010-03-22 | 2010-08-16 | Data retransmission method and apparatus |
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| CN2010101388957A CN102201901A (en) | 2010-03-22 | 2010-03-22 | Data retransmission method and device |
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| CN102201901A true CN102201901A (en) | 2011-09-28 |
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| WO (1) | WO2011116577A1 (en) |
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| CN105991243A (en) * | 2015-01-29 | 2016-10-05 | 中兴通讯股份有限公司 | Data repeat transmission method and device |
| CN106301709A (en) * | 2016-08-02 | 2017-01-04 | 芯启源电子科技有限公司 | USB electronic installation and data packet retransmission control method and system |
| CN106304188A (en) * | 2015-05-13 | 2017-01-04 | 苏州简约纳电子有限公司 | A kind of AM RLC is for retransmitting the receiving handling method of the optimization of data |
| CN106375069A (en) * | 2015-07-22 | 2017-02-01 | 普天信息技术有限公司 | Data retransmission method and apparatus |
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| GB2503469A (en) * | 2012-06-27 | 2014-01-01 | Renesas Mobile Corp | Limiting the size of protocol data units (PDUs) containing new data in a repeat transmission system |
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| CN101018191A (en) * | 2006-02-08 | 2007-08-15 | 华为技术有限公司 | Multi-queue packet data transmission method and its system |
| US20080123620A1 (en) * | 2006-11-20 | 2008-05-29 | Samsung Electronics Co., Ltd. | Apparatus and method for transmitting/receiving mac header in mobile communication system |
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| CN105991243A (en) * | 2015-01-29 | 2016-10-05 | 中兴通讯股份有限公司 | Data repeat transmission method and device |
| CN106304188A (en) * | 2015-05-13 | 2017-01-04 | 苏州简约纳电子有限公司 | A kind of AM RLC is for retransmitting the receiving handling method of the optimization of data |
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| CN106301709A (en) * | 2016-08-02 | 2017-01-04 | 芯启源电子科技有限公司 | USB electronic installation and data packet retransmission control method and system |
| CN106301709B (en) * | 2016-08-02 | 2019-11-05 | 芯启源电子科技有限公司 | USB electronic device and data packet retransmission control method and system |
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| WO2011116577A1 (en) | 2011-09-29 |
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Application publication date: 20110928 |