CN101989901B - Downlink data retransmission judging method and device - Google Patents
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Abstract
The invention discloses a downlink data retransmission judging method, which comprises: determining the value of the modulation and coding scheme (CMS) field in the downlink control information (DCI) corresponding to received downlink data; and judging if the downlink data is retransmission data according to the value of the MCS field. The invention also discloses a downlink data retransmission judging device. When the method and the device are adopted, the accuracy of the judgment of the retransmission of the downlink data can be ensured, and the performance of the HARQ system can be improved.
Description
Technical field
The present invention relates to communication technical field, relate in particular to re-transmission determination methods and the device of down link.
Background technology
LTE(Long Term Evolution, Long Term Evolution) in the agreement, L2(Layer2, layer 2) protocol stack comprises: PDCP(Packet Data Convergence Protocol, PDCP) layer, RLC(Radio Link Control, Radio Link control) protocol layer, MAC(Media Access Control, the medium access control) protocol layer.The PDCP layer is finished user's face and functions such as chain of command transfer of data, encryption, integrity protection and head compression; The rlc protocol layer is finished the functions such as size coupling of packet, comprises segmentation, cascade, heavily segmentation; The MAC protocol layer is finished the functions such as mapping between data dispatch, logic channel and the transmission channel.
In downlink transmission, UE(User Equipment, subscriber equipment) side MAC protocol layer is to DCI(Downlink Control Information, down link control information) in NDI(New Data Indicator, new data indicator) field handles as follows:
(1) if this is the interim Cell Radio Network Temporary Identifier/Identity, Cell-RNTI of Temporary C-RNTI(to UE; C-RNTI:Cell Radio Network Temporary Identifer, Radio Network Temporary Identifier) the downlink resource first time distributes, and thinks that then the NDI field overturns;
(2) if this is the downlink resource distribution to the C-RNTI of UE, and before this at identical HARQ(Hybrid Automatic Repeat Request, mix automatic repeat requests) process number, SPS(Semi-Persistent Scheduling to this UE is arranged, semi-persistent scheduling) downlink resource of C-RNTI distributes, perhaps there is the downlink resource to the configuration of the C-RNTI of this UE to distribute, thinks that then the NDI field overturns;
(3) if the downlink resource of the SPS C-RNTI of UE is distributed:
A) if the NDI field is 1, think that then the NDI field do not overturn;
B) if if the NDI field is 0 and corresponding PDCCH(Physical Downlink Control Ch annel, the physical layer descending control channel) content is not that indication discharges the SPS resource, then preserve this TTI(T ransmission Time Interval, Transmission Time Interval) downlink resource that downlink resource is assigned as configuration distributes, and thinks that simultaneously the NDI field overturns;
(4) if not above situation, this TTI has the resource of configuration to distribute simultaneously, and is not to measure gap(interim), think that then the NDI field overturns;
(5) if not above situation, namely generally speaking, the TB(Transp ort Block that the UE side receives with this TTI, transmission block) NDI value and this TB before the NDI value of the last reception compare, judge the NDI field whether reality overturn.
The UE side is described as follows the processing of descending HARQ in the LTE 36321-850 agreement:
(1) overturns as if the NDI field, perhaps this HARQ process is seeding and passes through RRC(R adio Resource Control simultaneously, Radio Resource control) system message of signaling indication we know that this is to receive this TB for the first time, perhaps this is the reception first time (such as the NDI that does not have this TB before this) of this TB, what then think transmission this time is just to pass data, i.e. new data;
(2) if not above-mentioned situation then thinks it this time is to retransmit.
The inventor finds to exist in the prior art following deficiency:
Actual wireless communications environment may very severe, and the PDCCH of UE adopts blind Detecting, and this just may occur that PDCCH loses or communication abnormality situation such as PDCCH false-alarm.If occur that PDCCH loses or communication abnormality situation such as PDCCH false-alarm, then the order of NDI may will be upset, if still whether overturn to carry out the re-transmission judgement of down link data this moment according to the NDI field, judged result may be inaccurate, and then will have a negative impact to the performance of HARQ system.
Summary of the invention
The embodiment of the invention provides a kind of re-transmission determination methods of down link data, retransmits the accuracy of judging in order to guarantee down link data, promotes the performance of HARQ system, and this method comprises:
The value of modulation coding mode MCS field among the down link control information DCI of definite down link data correspondence that receives;
Determine whether new data indicator NDI field overturns among the described DCI;
Whether value and NDI field according to described MCS field overturn, and judge whether the down link data of described reception is data retransmission:
If the value of MCS field greater than 28 and the NDI field overturn, judge that then the down link data that receives is data retransmission;
If the value of MCS field smaller or equal to 28 and the NDI field overturn, judge that then the down link data that receives be first biography data.
The embodiment of the invention also provides a kind of re-transmission judgment means of down link data, retransmits the accuracy of judging in order to guarantee down link data, promotes the performance of HARQ system, and this device comprises:
First determination module, the value of the down link control information DCI modulation coding mode MCS field of the down link data correspondence that be used for to determine receives;
Second determination module is used for determining whether described DCI new data indicator NDI field overturns;
Whether judge module is used for overturning according to value and the NDI field of described MCS field, judges whether the down link data of described reception is data retransmission;
Described judge module specifically comprises:
Second judging unit is used in the value of MCS field judging that greater than 28 and NDI field when overturning the down link data that receives is data retransmission; Smaller or equal to 28 and NDI field when having overturn, judge that the down link data that receives be first biography data in the value of MCS field.
In the embodiment of the invention, the value of modulation coding mode MSC field among the down link control information DCI of definite down link data correspondence that receives; Determine whether new data indicator NDI field overturns among the described DCI; Whether value and NDI field according to described MCS field overturn, whether the down link data of judging described reception is data retransmission, rather than only carry out the down link data re-transmission according to the NDI field and judge, guaranteed that down link data retransmits the accuracy of judging, promoted the performance of HARQ system.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.In the accompanying drawings:
Fig. 1, Fig. 2 are the re-transmission determination methods flow chart of down link data in the embodiment of the invention;
Fig. 3 is the structural representation of the re-transmission judgment means of down link data in the embodiment of the invention;
Fig. 4 is the structural representation of the judge module of Fig. 3 in the embodiment of the invention;
Fig. 5 is the structural representation of an instantiation of the re-transmission judgment means of down link data in the embodiment of the invention;
Fig. 6 is the structural representation of the judge module of Fig. 5 in the embodiment of the invention;
Fig. 7 is the structural representation of second determination module of Fig. 5 in the embodiment of the invention.
Embodiment
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer, below in conjunction with accompanying drawing the embodiment of the invention is described in further details.At this, illustrative examples of the present invention and explanation thereof are used for explanation the present invention, but not as a limitation of the invention.
For reduce that PDCCH loses or communication abnormality situation such as PDCCH false-alarm to the adverse effect of descending HARQ systematic function, the inventor considers, regulation in the LTE agreement (seeing agreement 3GPP TS36.213V8.6.0): distribute in the indication (being DCI) at downlink resource, if retransmit, then require Modulation an d Coding Scheme(modulation coding mode, MCS) value of field can only get 29,30 or 31, the corresponding modulating mode is QPSK(Quaternary Phase Shift Keying respectively, quaternary PSK), 16QAM(Quadrature Amplitude Modulation, quadrature amplitude modulation) and 64QAM, so what the MCS field among the DCI is used for judging current transmission in embodiments of the present invention is just to pass data or data retransmission.
As shown in Figure 1, in the embodiment of the invention, the re-transmission determination methods flow process of down link data can comprise:
The value of modulation coding mode MCS field among the down link control information DCI of step 101, definite down link data correspondence that receives.
Can be learnt by above-mentioned flow process, in the embodiment of the invention, the value of modulation coding mode MSC field among the down link control information DCI of definite down link data correspondence that receives; Value according to described MCS field, whether the down link data of judging described reception is data retransmission, rather than only carry out the down link data re-transmission according to the NDI field and judge, can avoid PDCCH to lose or communication abnormality situation such as PDCCH false-alarm under, owing to the NDI order is upset to cause and retransmit to be judged inaccurate, as to influence HARQ systematic function consequence, guaranteed that down link data retransmits the accuracy of judging, promoted the performance of HARQ system.
As previously mentioned, if down link data is data retransmission, then in current LTE agreement, the value that requires the MCS field is 29,30 or 31, and the corresponding modulating mode is QPSK, 16QAM, 64QAM respectively, therefore, can comprise during the concrete enforcement of step 102:
Greater than 28 o'clock, judge that the down link data that receives is data retransmission in the value of MCS field;
Smaller or equal to 28 o'clock, judge that the down link data that receives be first biography data in the value of MCS field.
The benchmark 28 of above-mentioned MCS field value only is an example in the enforcement, and the possibility of the concrete field value change of LTE agreement after not getting rid of is all within the embodiment coverage; Present embodiment is according to the value of MCS field, the down link data that receives is retransmitted judgement, whether overturn by the NDI field with respect to prior art and to carry out down link data and retransmit to judge, can avoid PDCCH to lose or communication abnormality situation such as PDCCH false-alarm under, upset to cause and retransmit to be judged inaccurate, as influence HARQ systematic function consequence owing to the NDI order, improved the accuracy of judging, the performance of lifting HARQ system.
The down link data that flow process shown in Figure 1 can be implemented under the various situations retransmits judgement, comprise that the HARQ process is seeding and can learns that by the system message of RRC signaling indication this is the reception first time of this TB simultaneously, perhaps this is the situations such as the reception first time of this TB.But in order to reduce the change to the LTE agreement as much as possible, can be data or the situation of data retransmission of just passing in what whether overturn by the NDI value to judge the eNB transmission with flow implementation shown in Figure 1, namely, the enforcement of above-described embodiment method for convenience, can fully utilize two field informations of MCS and NDI and carry out down link data re-transmission judgement, namely can when determining the value of MCS field, determine further whether new data indicator NDI field overturns among the described DCI in force; Whether follow-up value and NDI field according to the MCS field overturns, and the down link data that receives is retransmitted judgement.
As mentioned above, in another embodiment, can also fully utilize two field informations of MCS and NDI and carry out down link data re-transmission judgement, as shown in Figure 2, handling process can comprise:
The value of modulation coding mode MCS field among the down link control information DCI of step 201, definite down link data correspondence that receives.
When carrying out down link data re-transmission judgement by flow process shown in Figure 2, if the benchmark of MCS field value is numerical value 28, then concrete re-transmission is judged and can be comprised in the enforcement:
If the value of MCS field greater than 28 and the NDI field overturn, judge that then the down link data that receives is data retransmission, what namely eNB sent is data retransmission;
If the value of MCS field smaller or equal to 28 and the NDI field overturn, judge that then the down link data that receives be just to pass data, namely eNB sends is first biography data.
As seen, judging whether the downlink data that the eNB side sends is when just passing data, can whether not overturn as unique criterion with NDI in the prior art for another example in the embodiment of the invention, but carrying out down link data, comprehensive utilization MCS and two field informations of NDI retransmit judgement, can guarantee that down link data retransmits the accuracy of judging, promote the performance of HARQ system, also reduced the change to the LTE agreement as much as possible, made things convenient for the enforcement of above-described embodiment method.
Flow process shown in Figure 2 can also be implemented on further when judging whether the NDI value overturns need by this NDI value constantly with before the NDI value different situation about judging whether of the data that receive of the nearest moment of this TB.Namely in one embodiment of the invention, determine in the above-mentioned steps 202 that whether the NDI field overturns, and is specifically as follows:
Before the value of the NDI field that the transmission block TB of current transmission time interval TTI receiving downlink data is received and the described TB once the value of the NDI field of reception compare;
According to comparative result, determine whether the NDI field overturns, if the value of the NDI field that once receives before the value of the NDI field that the described TB of current TTI receives and the described TB is consistent, then definite NDI field is overturn; If the value of the NDI field that once receives before the value of the NDI field that the described TB of current TTI receives and the described TB is inconsistent, then definite NDI field is overturn.
One of ordinary skill in the art will appreciate that all or part of step that realizes in above-described embodiment method is to instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, this program is when carrying out, can comprise all or part of step in above-described embodiment method, described storage medium can comprise: ROM, RAM, disk, CD etc.
Also provide a kind of re-transmission judgment means of down link data in the embodiment of the invention, as described in the following examples.Because the principle of this device solves problem is similar to the re-transmission determination methods of down link data, so the enforcement of this device can repeat part and repeat no more referring to the enforcement of method.
As shown in Figure 3, in the one embodiment of the invention, the re-transmission judgment means of down link data can comprise:
In the embodiment of the invention, the value of modulation coding mode MSC field among the down link control information DCI of first determination module, 301 definite down link data correspondences that receive; Judge module 302 is according to the value of described MCS field, whether the down link data of judging described reception is data retransmission, rather than utilize the NDI field to carry out the down link data re-transmission and judge, can avoid PDCCH to lose or communication abnormality situation such as PDCCH false-alarm under, owing to the NDI order is upset to cause and retransmit to be judged inaccurate, as to influence HARQ systematic function consequence, guaranteed that down link data retransmits the accuracy of judging, promoted the performance of HARQ system.
If down link data is data retransmission, then in current LTE agreement, the value that requires the MCS field is 29,30 or 31, the corresponding modulating mode is QPSK, 16QAM, 64QAM respectively, therefore, and as shown in Figure 4, among the embodiment, judge module 302 specifically can comprise:
First judging unit 401 was used for value in the MCS field greater than 28 o'clock, and the down link data of judging described reception is data retransmission; Smaller or equal to 28 o'clock, judge that the down link data of described reception is for just passing data in the value of MCS field.
The benchmark 28 of above-mentioned MCS field value only is an example in the enforcement, and the possibility of the concrete field value change of LTE agreement after not getting rid of is all within the embodiment coverage; Whether present embodiment retransmits judgement according to the value of MCS field to the down link data that receives, overturn by the NDI field with respect to prior art and carry out down link data re-transmission judgement, can improve the accuracy of judgement, the performance of lifting HARQ system.
In order to reduce the change to the LTE agreement as much as possible, make things convenient for the enforcement of above-described embodiment method, can also fully utilize two field informations of MCS and NDI and carry out down link data re-transmission judgement, namely as shown in Figure 5, among the embodiment, device shown in Figure 3 can also comprise:
This moment, whether judge module 302 can also specifically be used for overturning according to value and the NDI field of MCS field, judged whether the down link data of described reception is data retransmission.
As seen, judging whether the downlink data that the eNB side sends is when just passing data, can whether not overturn as unique criterion with NDI in the prior art for another example in the embodiment of the invention, but carrying out down link data, comprehensive utilization MCS and two field informations of NDI retransmit judgement, can guarantee that down link data retransmits the accuracy of judging, promote the performance of HARQ system, also reduced the change to the LTE agreement as much as possible, made things convenient for the enforcement of above-described embodiment method.
As shown in Figure 6, among the embodiment, judge module 302 specifically can comprise among Fig. 5:
Need to prove that first judging unit 401 and second judging unit 601 can simultaneously or separately exist in the judge module 302.
As shown in Figure 7, among the embodiment, second determination module 501 can comprise:
Before the comparing unit 701, the value that is used for the NDI field that the transmission block TB with current transmission time interval TTI receiving downlink data receives and described TB once the value of the NDI field of reception compare;
Determining unit 702 when being used for that once the value of the NDI field of reception is consistent before the value of the NDI field that the described TB of current TTI receives and described TB, determines that the NDI field overturns; When once the value of the NDI field of reception is inconsistent before the value of the NDI field that the described TB of current TTI receives and described TB, determine that the NDI field overturns.
In the embodiment of the invention, the value of modulation coding mode MSC field among the down link control information DCI of definite down link data correspondence that receives; Value according to described MCS field, whether the down link data of judging described reception is data retransmission, rather than only carry out the down link data re-transmission according to the NDI field and judge, can avoid PDCCH to lose or communication abnormality situation such as PDCCH false-alarm under, owing to the NDI order is upset to cause to retransmit and is judged inaccurate, as to influence HARQ systematic function consequence; Utilize the absoluteness of MCS field value in the downlink resource indication, namely do not rely on the MCS value of the data that receive at this TB before the UE, guaranteed that down link data retransmits the accuracy of judgement, has promoted the performance of HARQ system.
Above-described specific embodiment; purpose of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the above only is specific embodiments of the invention; and be not intended to limit the scope of the invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (4)
1. the re-transmission determination methods of a down link data is characterized in that, this method comprises:
The value of modulation coding mode MCS field among the down link control information DCI of definite down link data correspondence that receives;
Determine whether new data indicator NDI field overturns among the described DCI;
Whether value and NDI field according to described MCS field overturn, and judge whether the down link data of described reception is data retransmission:
If the value of MCS field greater than 28 and the NDI field overturn, judge that then the down link data that receives is data retransmission;
If the value of MCS field smaller or equal to 28 and the NDI field overturn, judge that then the down link data that receives be first biography data.
2. the method for claim 1 is characterized in that, whether described definite NDI field overturns, and comprising:
Before the value of the NDI field that the transmission block TB of current transmission time interval TTI receiving downlink data is received and the described TB once the value of the NDI field of reception compare;
If the value of the NDI field that once receives before the value of the NDI field that the described TB of current TTI receives and the described TB is consistent, then definite NDI field is overturn;
If the value of the NDI field that once receives before the value of the NDI field that the described TB of current TTI receives and the described TB is inconsistent, then definite NDI field is overturn.
3. the re-transmission judgment means of a down link data is characterized in that, this device comprises:
First determination module, the value of the down link control information DCI modulation coding mode MCS field of the down link data correspondence that be used for to determine receives;
Second determination module is used for determining whether described DCI new data indicator NDI field overturns;
Whether judge module is used for overturning according to value and the NDI field of described MCS field, judges whether the down link data of described reception is data retransmission;
Described judge module specifically comprises:
Second judging unit is used in the value of MCS field judging that greater than 28 and NDI field when overturning the down link data that receives is data retransmission; Smaller or equal to 28 and NDI field when having overturn, judge that the down link data that receives be first biography data in the value of MCS field.
4. device as claimed in claim 3 is characterized in that, described second determination module comprises:
Before the comparing unit, the value that is used for the NDI field that the transmission block TB with current transmission time interval TTI receiving downlink data receives and described TB once the value of the NDI field of reception compare;
Determining unit when being used for that once the value of the NDI field of reception is consistent before the value of the NDI field that the described TB of current TTI receives and described TB, determines that the NDI field overturns; When once the value of the NDI field of reception is inconsistent before the value of the NDI field that the described TB of current TTI receives and described TB, determine that the NDI field overturns.
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| CN107566096A (en) * | 2016-06-30 | 2018-01-09 | 北京华为数字技术有限公司 | A kind of terminal-to-terminal service D2D communication means, relevant device and system |
| CN107733597A (en) * | 2016-08-11 | 2018-02-23 | 株式会社Ntt都科摩 | Determine the method and base station and user equipment of hybrid automatic repeat request processes number |
| US10277357B2 (en) | 2017-01-19 | 2019-04-30 | Qualcomm Incorporated | Selection of modulation and coding scheme |
| CN108631929B (en) * | 2017-03-24 | 2021-06-08 | 华为技术有限公司 | Data transmission method and device |
| US10736083B2 (en) * | 2017-05-01 | 2020-08-04 | Huawei Technologies Co., Ltd. | Systems and methods for downlink control channel signaling for uplink transmission |
| CN113541908B (en) * | 2018-09-27 | 2023-06-06 | 中兴通讯股份有限公司 | Data transmission method and device, and data receiving method and device |
| CN113853826B (en) * | 2019-09-06 | 2023-06-27 | 华为技术有限公司 | Data retransmission method and related device |
| WO2021109413A1 (en) * | 2020-04-17 | 2021-06-10 | Zte Corporation | Data transmission scheme |
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| WO2008128204A1 (en) * | 2007-04-13 | 2008-10-23 | Qualcomm Incorporated | Adaptive synchronous harq transmission |
| CN101404815A (en) * | 2008-10-31 | 2009-04-08 | 中兴通讯股份有限公司 | Descending control information processing method |
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| WO2008128204A1 (en) * | 2007-04-13 | 2008-10-23 | Qualcomm Incorporated | Adaptive synchronous harq transmission |
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