CN101237309B - Data retransfer method, device and automatic retransfer request entity of transmission end - Google Patents
Data retransfer method, device and automatic retransfer request entity of transmission end Download PDFInfo
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- CN101237309B CN101237309B CN2007100031457A CN200710003145A CN101237309B CN 101237309 B CN101237309 B CN 101237309B CN 2007100031457 A CN2007100031457 A CN 2007100031457A CN 200710003145 A CN200710003145 A CN 200710003145A CN 101237309 B CN101237309 B CN 101237309B
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Abstract
The invention provides a method, a device for data retransmission and an automatic retransmission request entity for a sending end, wherein, the method for data retransmission comprises the follows steps that: when the automatic retransmission request ARQ entity for the sending end is acknowledged of the failure of data transmission, the automatic retransmission request ARQ entity for the sending end detects an air interface resource; if the air interface resource is adequate, the automatic retransmission request ARQ entity for the sending end repacks and renumbers the data with unsuccessful transmission, and instructs a mixed automatic retransmission request HARQ entity for the sending end to adopt a modulation level lower than the present modulation level to retransmit data; the HARQ entity for the sending end retransmits the data according to the ARQ entity. With the invention, when the ARQ entity for the sending end detects that the HARQ entity for the sending end has unsuccessful data retransmission or data transmission, the ARQ entity for a sending end adopts to instruct the HARQ entity for the sending end to carry out data retransmission with a modulation level lower than the present modulation level, which increases the successful probability of data retransmission.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of data re-transmission technology.
Background technology
At UMTS (Universal Mobile Telecommunication Systems, universal mobile telecommunications system) and LTE (Long Term Evolution, Long Term Evolution) in the system, transmitting terminal and receiving terminal all support RLC (Radio Link Control, Radio Link control) to retransmit.
But, no matter be the UMTS system, or the LTE system, the possibility of loss of data when all existing layer one (being physical layer) to retransmit.In the 3GPP standard, propose to realize data retransmission method, as shown in Figure 1 based on layer one and the exchange of layer two (promptly being data link layer).
HARQ (Hybrid Automatic Repeat Request mixes automatic repeat requests) entity is at layer one, and ARQ (Automatic Repeat Request, repeat requests automatically) entity is at layer two.
Transmitting terminal HARQ entity sends NDI (New Data Indicator, new data indication) is 0 PDUx (Packet Data Unit, Packet Data Unit) gives receiving terminal HARQ entity, if receiving terminal HARQ entity returns NACK (confirming incorrect) message, then to send NDI be that 1 PDUy is to receiving terminal HARQ entity to transmitting terminal HARQ entity, if receiving terminal HARQ entity still receives incorrect, then notify receiving terminal ARQ entity, after receiving terminal ARQ entity is notified, inform transmitting terminal ARQ entity, need begin to retransmit from PDUx, so transmitting terminal ARQ entity retransmits PDUx and gives transmitting terminal HARQ entity.
In the technique scheme, when layer one retransmission entities detects NACK mistake or layer one retransmission entities correctly during transmits data packets, layer one entity will be notified layer two, trigger layer two retransmits, but, if under the situation that does not have obviously to improve at channel quality, even if retransmit once more, probability that can not packet is correctly transmitted when improving layer two in essence and retransmit.
Summary of the invention
The embodiment of the invention provides a kind of data retransmission method, device and transmitting terminal automatic repeat requests entity, the probability that is correctly transmitted when improving data re-transmission.
Embodiments of the invention provide a kind of data retransmission method, comprising:
When the automatic repeat requests ARQ entity of transmitting terminal is known data transmission fails, detect air interface resource, if air interface resource is enough, then the data of bust this are repacked numbering, and the indication transmitting terminal mixes automatic repeat requests HARQ entity employing than the low-grade modulation levels data retransmission of current modulation levels, if air interface resource is not enough, then indicates transmitting terminal to mix automatic repeat requests HARQ entity and adopt and current identical modulation levels data retransmission;
Described transmitting terminal HARQ entity retransmits described data according to the indication of described ARQ entity.
The embodiment of the invention also provides a kind of transmitting terminal ARQ entity, comprising:
Know the unit, be used to know the information of transmission data failure,, then notify detecting unit if learn bust this information; Detecting unit is used to detect the transmitting terminal air interface resource, if air interface resource is enough, then sends message to indicating member;
Indicating member, be used under the enough situations of interface resource aloft, data to bust this are repacked numbering, and indication transmitting terminal HARQ entity adopts than the low-grade modulation levels data retransmission of current modulation levels, and aloft interface resource is not enough, and the indication transmitting terminal mixes automatic repeat requests HARQ entity to be adopted and current identical modulation levels data retransmission.
The embodiment of the invention also provides a kind of data re-transmission device, comprise: transmitting terminal ARQ entity and transmitting terminal HARQ entity, described transmitting terminal ARQ entity, be used for when knowing data transmission fails, detect air interface resource, if air interface resource is enough, indication transmitting terminal HARQ entity adopts the modulation levels data retransmission lower than current modulation levels, if air interface resource is not enough, then indicates transmitting terminal to mix automatic repeat requests HARQ entity and adopt and current identical modulation levels data retransmission;
Transmitting terminal HARQ entity is used for retransmitting described data according to the indication of described ARQ entity.
The technical scheme that provides according to embodiments of the invention, when transmitting terminal ARQ entity detection arrives transmitting terminal HARQ entity after data re-transmission or data transmission fails, adopt indication transmitting terminal HARQ entity to carry out data re-transmission, increased the data re-transmission probability of successful than the low-grade modulation levels of current modulation levels.
Description of drawings
Fig. 1 is the flow chart of data re-transmission in the prior art;
Fig. 2 is the flow chart of the described data repeating method of the embodiment of the invention;
Fig. 3 is the flow chart of the described method embodiment one of the embodiment of the invention;
Fig. 4 is the flow chart of the described method embodiment two of the embodiment of the invention;
Fig. 5 is the described ARQ entity structure of an embodiment of the invention block diagram;
Fig. 6 is the described data re-transmission apparatus structure of an embodiment of the invention block diagram.
Embodiment
Below, in conjunction with the accompanying drawings the embodiment of the invention is described in detail.
As shown in Figure 2, the data retransmission method of the embodiment of the invention specifically comprises:
Wherein, in step 202, if air interface resource is not enough, then directly the packing data of described bust this is numbered, and indication transmitting terminal HARQ entity employing and current identical modulation levels data retransmission, this is the technical scheme described in the background technology, no longer is repeated in this description at this.
Wherein, whether described air interface resource is enough, provides after being judged by MAC (MediaAccess Control, medium access control) layer scheduling entity;
Wherein, described transmitting terminal ARQ entity knows that the approach of data transmission fails comprises:
Transmitting terminal ARQ entity receives HARQ solid data bust this message or receives receiving terminal ARQ packet verification failed message or the transmitting terminal ARQ entity timer that receives surpassed the default transmission time.
Embodiment one
Transmitting terminal ARQ entity and receiving terminal ARQ entity are positioned at layer two, and transmitting terminal HARQ entity and receiving terminal HARQ entity are positioned at layer one, and as shown in Figure 3, concrete data re-transmission step is as follows:
Step 302 after transmitting terminal HARQ entity receives PDU, sends to the HARQ entity of receiving terminal, starts transmitting terminal HARQ entity timer simultaneously;
Step 303, after receiving terminal HARQ entity received PDU, if receiving terminal HARQ entity returns NACK message, then transmitting terminal HARQ entity was retransmitted described PDU;
Step 304 surpasses preset value, transmitting terminal HARQ entity timer expiry or transmitting terminal ARQ entity timer expiry if retransmit number of times, and then execution in step 305;
Step 305, transmitting terminal HARQ entity send the transmitting terminal ARQ entity of message to layer two, inform to retransmit failure;
Step 306, transmitting terminal ARQ entity detection air interface resource if air interface resource is enough, is then repacked numbering with described PDU, and indication transmitting terminal HARQ entity adopts the modulation levels data retransmission lower than current modulation levels;
Here, can adopt modulation levels data retransmission, also can adopt modulation levels data retransmission than low two grades of current modulation levels than the low grade of current modulation levels;
If the air interface resource deficiency is then repacked numbering with described PDU, transmitting terminal HARQ entity is according to current modulation levels data retransmission;
Step 307 sends to transmitting terminal HARQ entity with described indication;
Step 308, transmitting terminal HARQ entity send to PDU the HARQ entity of receiving terminal according to the indication of transmitting terminal ARQ;
Step 309 if receiving terminal HARQ entity receives correct PDU, then sends ACK (confirming correct) message and gives transmitting terminal HARQ entity;
Step 311, the ARQ entity of receiving terminal are returned the ARQ entity that ACK message is given transmitting terminal.
Present embodiment, transmitting terminal ARQ entity detection arrives transmitting terminal HARQ entity after data re-transmission or data transmission fails, adopt indication transmitting terminal HARQ entity to carry out data re-transmission, increased the data re-transmission probability of successful than the low-grade modulation levels of current modulation levels.
Embodiment two
As shown in Figure 4, its realization flow and embodiment one are basic identical, and wherein, step 401～step 402 is identical with step 301～step 302 among the embodiment one, step 407～step 412 is identical with step 306～step 311 among the embodiment one, no longer is repeated in this description at this.
Two embodiment different places be:
Step 403, transmitting terminal HARQ entity receives the ACK message that receiving terminal HARQ entity returns;
Step 404, receiving terminal HARQ entity continue described PDU is sent to receiving terminal ARQ entity;
Step 405, receiving terminal ARQ entity carries out verification to the PDU that receives, if for PDU verification failure, then execution in step 406;
Step 406, receiving terminal ARQ entity are directly returned NACK message and are given transmitting terminal ARQ entity;
Step 407, whether after transmitting terminal ARQ entity receives NACK message, it is enough to detect air interface resource, if air interface resource is enough, then described PDU is repacked numbering, and indication transmitting terminal HARQ entity adopts than current low-grade modulation levels data retransmission.
According to embodiment one, embodiment two described methods, the embodiment of the invention also provides a kind of transmitting terminal ARQ entity 50, as shown in Figure 5.
Transmitting terminal ARQ entity 50 comprises:
Know unit 51, be used to know the information of transmission data failure,, then notify detecting unit 52 if learn data transmission fails information;
Detecting unit 52, whether enough, if enough, then send message to indicating member 53 if being used to detect air interface resource;
Indicating member 53 is used under the enough situations of interface resource aloft the data of bust this being repacked numbering, and indication transmitting terminal HARQ entity adopts the modulation levels data retransmission than a current low grade.
When transmitting terminal ARQ entity 50 know that unit 51 learns data transmission fails the time, detecting unit 52 detects air interface resource, if air interface resource is enough, then the data of bust this are repacked numbering, and indication transmitting terminal HARQ entity adopts the modulation levels data retransmission than a current low grade by indicating member 53.
According to embodiment one, embodiment two described methods, the embodiment of the invention also provides a kind of data re-transmission device, as shown in Figure 6, data re-transmission device 70 comprises: transmitting terminal ARQ entity 50 and transmitting terminal HARQ entity 60, when transmitting terminal ARQ entity 50 is known data transmission fails, detect air interface resource, if air interface resource is enough, then the data of bust this are repacked numbering, and indicate transmitting terminal HARQ entity 60 to adopt than the low-grade modulation levels data retransmission of current modulation levels, transmitting terminal HARQ60 entity retransmits described data according to the indication of described ARQ entity 50.
Transmitting terminal ARQ entity 50, indication transmitting terminal HARQ entity adopts the modulation levels data retransmission lower than current modulation levels to be: described indicating member indication transmitting terminal HARQ entity adopts the modulation levels data retransmission than the low grade of current modulation levels.
State transmitting terminal ARQ entity 50, know that data transmission fails is: transmitting terminal ARQ entity knows that transmitting terminal HARQ solid data bust this message, receiving terminal ARQ surpass the message of presetting the transmission time to packet verification failed message or the transmitting terminal ARQ entity timer that receives.
Wherein, transmitting terminal ARQ entity 50 comprises:
Know unit 51, be used to know the information of transmission data failure,, then notify detecting unit 52 if learn data transmission fails information;
Detecting unit 52, whether enough, if enough, then send message to indicating member 53 if being used to detect air interface resource;
Indicating member 53 is used under the enough situations of interface resource aloft the data of bust this being repacked numbering, and indication transmitting terminal HARQ entity adopts the modulation levels data retransmission than a current low grade.
Cumulated volume invention present embodiment is described, can see, transmitting terminal ARQ entity detection arrives transmitting terminal HARQ entity after data re-transmission or data transmission fails, adopt indication transmitting terminal HARQ entity to carry out data re-transmission, increased the data re-transmission probability of successful than the low-grade modulation levels of current modulation levels.
The above only is preferred embodiment of the present invention, and is in order to restriction the present invention, within the spirit and principles in the present invention not all, any modification of being done, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a data retransmission method is characterized in that, comprising:
When the automatic repeat requests ARQ entity of transmitting terminal is known data transmission fails, detect air interface resource, if air interface resource is enough, the indication transmitting terminal mixes automatic repeat requests HARQ entity and adopts the modulation levels data retransmission lower than current modulation levels, if air interface resource is not enough, then indicates transmitting terminal to mix automatic repeat requests HARQ entity and adopt and current identical modulation levels data retransmission;
Described transmitting terminal HARQ entity retransmits described data according to the indication of described ARQ entity.
2. method according to claim 1 is characterized in that, the described employing modulation levels lower than current modulation levels is: adopt the modulation levels than the low grade of current modulation levels.
3. method according to claim 1 and 2 is characterized in that, described transmitting terminal ARQ entity knows that data transmission fails further comprises:
Transmitting terminal ARQ entity receives transmitting terminal HARQ solid data bust this message or receives receiving terminal ARQ packet verification failed message or the transmitting terminal ARQ entity timer that receives surpassed the default transmission time.
4. method according to claim 3 is characterized in that, the bust this of described transmitting terminal HARQ solid data further comprises:
The number of times that retransmits described data surpasses the default transmission time above preset value or transmitting terminal HARQ entity timer.
5. the automatic repeat requests entity of transmitting terminal is characterized in that, comprising:
Know the unit, be used to know the information of transmission data failure, and the notice detecting unit;
Detecting unit is used for the information of knowing that according to described the unit is known, detects air interface resource, if air interface resource is enough, then sends message to indicating member;
Indicating member, be used for detecting under the enough situations of air interface resource according to described detecting unit, indication transmitting terminal HARQ entity adopts the modulation levels data retransmission lower than current modulation levels, and aloft interface resource is not enough, and the indication transmitting terminal mixes automatic repeat requests HARQ entity to be adopted and current identical modulation levels data retransmission.
6. transmitting terminal ARQ entity according to claim 5 is characterized in that,
Described indicating member transmitting terminal HARQ entity adopts the modulation levels data retransmission lower than current modulation levels to be specially: described indicating member indication transmitting terminal HARQ entity adopts the modulation levels data retransmission than the low grade of current modulation levels.
7. according to claim 5 or 6 described transmitting terminal ARQ entities, it is characterized in that,
Describedly know that the message of the bust this that the unit is known is: the message that transmitting terminal HARQ solid data bust this message, receiving terminal ARQ surpass the default transmission time to the packet verification failed message that receives or transmitting terminal ARQ entity timer.
8. data re-transmission device comprises: transmitting terminal ARQ entity and transmitting terminal HARQ entity, it is characterized in that,
Described transmitting terminal ARQ entity, be used for when knowing data transmission fails, detect air interface resource, if air interface resource is enough, indication transmitting terminal HARQ entity adopts the modulation levels data retransmission lower than current modulation levels, if air interface resource is not enough, then indicates transmitting terminal to mix automatic repeat requests HARQ entity and adopt and current identical modulation levels data retransmission;
Transmitting terminal HARQ entity is used for retransmitting described data according to the indication of described ARQ entity.
9. data re-transmission device according to claim 8 is characterized in that,
Described transmitting terminal ARQ entity indication transmitting terminal HARQ entity adopts the modulation levels data retransmission lower than current modulation levels to be: described indicating member indication transmitting terminal HARQ entity adopts the modulation levels data retransmission than the low grade of current modulation levels.
10. according to Claim 8 or 9 described data re-transmission devices, it is characterized in that described transmitting terminal ARQ entity knows that data transmission fails is: transmitting terminal ARQ entity knows that transmitting terminal HARQ solid data bust this message, receiving terminal ARQ surpass the message of presetting the transmission time to packet verification failed message or the transmitting terminal ARQ entity timer that receives.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2007100031457A CN101237309B (en) | 2007-01-31 | 2007-01-31 | Data retransfer method, device and automatic retransfer request entity of transmission end |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2007100031457A CN101237309B (en) | 2007-01-31 | 2007-01-31 | Data retransfer method, device and automatic retransfer request entity of transmission end |
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| CN101237309B true CN101237309B (en) | 2011-09-14 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101621367B (en) * | 2009-06-09 | 2012-11-14 | 华中科技大学 | HARQ decoding method based on packet check information |
| CN102104457A (en) * | 2009-12-18 | 2011-06-22 | 中兴通讯股份有限公司 | Method for indicating uplink hybrid automatic repeat request information, mobile terminal and base station |
| CN102111252B (en) * | 2009-12-25 | 2014-03-19 | 中兴通讯股份有限公司南京分公司 | Hybrid automatic repeat request-based repeat resource distribution method |
| CN101902316B (en) * | 2010-06-22 | 2015-01-28 | 中兴通讯股份有限公司 | Method and system for improving data retransmission quality |
| CN103957073B (en) * | 2014-03-21 | 2018-02-16 | 天地融科技股份有限公司 | A kind of method carried out data transmission by COBBAIF |
| CN105634686B (en) * | 2014-10-31 | 2018-10-12 | 中国移动通信集团公司 | A kind of method and device for realizing base station and the flexible HARQ timings of terminal room |
| CN106549736A (en) * | 2015-09-17 | 2017-03-29 | 中国移动通信集团公司 | A kind of cross-carrier rlc layer data repeating method and device |
| CN111130720B (en) * | 2019-12-24 | 2022-11-08 | 天地伟业技术有限公司 | Retransmission mechanism based on memory optimization |
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