CN101547077B - Method for transferring ACK/NACK information - Google Patents
Method for transferring ACK/NACK information Download PDFInfo
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- CN101547077B CN101547077B CN2008101025636A CN200810102563A CN101547077B CN 101547077 B CN101547077 B CN 101547077B CN 2008101025636 A CN2008101025636 A CN 2008101025636A CN 200810102563 A CN200810102563 A CN 200810102563A CN 101547077 B CN101547077 B CN 101547077B
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Abstract
The invention discloses a method for transferring ACK/NACK information, including the steps that an ACK/NACK numerical field carried by eNodeB in UL Grant is used for informing the bit number of the ACK/NACK information obligated on PUSCH by UE; Index information corresponding to each DL Grant on a PDCCH channel and carried by the eNodeB is used for informing the obligated position of the ACK/NACK feedback information of downlink transmission data corresponding to the DL Grant of the UE on the PUSCH; the UE carries the accurately received ACK/NACK information of the downlink transmission data corresponding to all the DL Grants on the appointed obligated position of the PUSCH and judges whether the instance that the DL Grant loses exists, if so, the ACK/NACK information corresponding to the lost DL Grant is set to be NACK, and the eNodeB is informed of the existence of the loss of the DL Grant; and the eNodeB retransfers the corresponding DL Grant and a corresponding downlink data block. The invention can solve the problems of a plurality of ACK/NACK feedbacks on the PUSCH and the loss of the DL Grant on the premise of not lowering the uplink covering range.
Description
Technical field
The present invention relates to field of data transmission, particularly a kind of method of transferring ACK/nack message.
Background technology
In Long Term Evolution (LTE) system, the upstream data of UE is gone up transmission at ascending physical signal shared channel (PUSCH), and in the LTE system, ascending resource still is that scheduling downlink resource is all controlled by enhanced base station (eNodeB).When UE needs transmit ascending data, send upstream request to eNodeB, then, eNodeB sends up replying (UL Grant) and gives UE, notifies UE up resource scheduling information, thereby specifies in the resource that is used for transmit ascending data on the PUSCH for UE.
If eNodeB has downlink data to send to UE, eNodeB notifies UE descending resource scheduling information with descending replying (DL Grant), and UE receives the corresponding downstream data block according to DL Grant in current downlink frame.After current downlink frame finished, UE can be in ensuing uplink frame, and at each data block that current downlink frame receives, feedback receives the ACK/NACK information of correctness, the corresponding DL Grant of one of them downlink data block.If UE just has other upstream datas to transmit when feeding back ACK/nack message, be assigned with the PUSCH channel, UE can ACK/NACK information inserts in the PUSCH channel and feed back to eNodeB so.
In the method for above-mentioned transferring ACK/nack message, eNodeB has transmitted downlink data, expectation UE feedback receives the information A CK or the NACK of correctness in ensuing uplink frame, if any one DL Grant loses, UE just can not insert the ACK or the nack message of this DL Grant respective data blocks in PUSCH, and in fact, eNodeB does not also know whether UE correctly receives DL Grant, and can suppose correctly all DL Grant of UE, eNodeB will think ACK or NACK to the data mistake among the PUSCH like this, certainly will influence message transmission.
In the FDD system, because whether any one descending transmission has the ascending time slot of set time position to confirm to receive correct, so can in PUSCH, reserve 1 bit by corresponding each descending time slot, be used for feeding back ACK/nack message, like this, even DL Grant loses, UE can not utilize corresponding reserved location transmit ascending data yet.
But in TDD, because up link and down link are asymmetric, the descending time slot number is greater than the ascending time slot number usually, therefore, need be in an ascending time slot ACK/NACK information of a plurality of downlink data block of multiplexing transmission.And because uplink and downlink timeslot does not possess relation one to one, therefore, the multiplexing relation of necessary clear and definite a plurality of ACK/NACK, otherwise eNodeB can't distinguish the ACK/NACK information at different downlink data block feedbacks.
For solving the problem that exists in the above-mentioned TDD system, the mode of existing transferring ACK/nack message is: the ACK/NACK information of a plurality of descending time slot correspondences is used and (AND) operation, only feed back the information of the ACK/NACK of 1 bit, owing to be and operation, if what the corresponding feedback of a descending time slot was arranged is nack message, the information that so finally feeds back to eNodeB is exactly NACK.But eNodeB can't learn the reception of concrete which descending time slot and go wrong, so eNodeB will retransmit all downlink datas in the downlink frame, will reduce descending throughput greatly like this.If do not adopt the mode of 1 bit, with many bits and adopt high order modulation also passable, but will reduce up covering like this such as QPSK.And no matter for the mode of 1 bit, DL Grant loses the ACK/NACK information that caused and the problem of obscuring of UE upstream data still exists.
Summary of the invention
In view of this, the invention provides a kind of method of transferring ACK/nack message, can be under the prerequisite that does not reduce up coverage, solve many ACK/NACK feedbacks on PUSCH and the problem of losing of DLGrant.
For achieving the above object, the present invention adopts following technical scheme:
A kind of method of transferring ACK/nack message comprises:
When user terminal UE has upstream data to send, enhanced base station eNodeB carries up feeding back ACK/NACK number field in sending to the up UL of the replying Grant of UE, be used to notify UE to remain for the position number or the bit number of feeding back ACK/nack message in advance on PUSCH; ENodeB sends the descending DL Grant that replys to UE, and corresponding each DL Grant carries index Index information on the PDCCH channel, the position that is used to notify the ACK/NACK feedback information of the downlink transmission data of the described DL Grant of UE correspondence to reserve on PUSCH;
UE is according to the ACK/NACK number field of carrying among the UL Grant that receives and correct all DL Grant that receive and corresponding Index information thereof, wrong feedback information is carried at the ACK/NACK of all DL Grant corresponding downlink data of correctly receiving on the appointment reserved location of PUSCH, and the loss situation that judges whether to exist DL Grant according to the ACK/NACK number field and the Index information of described reception, if, then determine the position that the ACK/NACK information of the DL Grant correspondence of losing is reserved on PUSCH, on this position, carry nack message, and the cyclic redundancy check value CRC that calculates according to upstream data is carried out preassigned first operate, operating result is carried at as new CRC sends to eNodeB in the uplink frame;
ENodeB receives the described uplink frame that UE sends, and the CRC that calculates gained is carried out described first operate, if operating result equates that with the CRC of reception then DL Grant is lost in existence, determine the DLGrant that loses, and retransmit this DL Grant and corresponding downstream data block.
Preferably, described on the PDCCH channel corresponding each DL Grant carry Index information and comprise:
In DL Grant, increase DL Grant id field and carry Index information;
Perhaps, different and when being consecutive numbers as the HARQ of down link Process ID, and different data flow is corresponding to different HARQ Process ID, with the Index information of described HARQ Process ID as the DLGrant correspondence;
Preferably, determine ACK/NACK reserved area on the PUSCH according to the ACK/NACK number field that receives.
Preferably, the original position of ACK/NACK feedback information in described ACK/NACK reserved area of the downlink transmission data of the described DL Grant of described Index message identification correspondence.
Preferably, described Index information according to the ACK/NACK number field that receives, all DL Grant and correspondence thereof judges whether to exist the loss situation of DL Grant to comprise:
According to all the DL Grant and the corresponding Index information thereof of correct reception, determine the ACK/NACK information number that correct all DL Grant that receive need feed back;
If the value of described ACK/NACK number field is unequal with the described ACK/NACK information number of determining of feedback that needs, then judge to have losing of DL Grant.
Preferably, the position reserved on PUSCH of the described ACK/NACK information of determining the DL Grant correspondence of losing comprises:
Determine the Index information of all correct DL Grant correspondences that receive, and the value of this Index information and described ACK/NACK number field compared, reserved location on the PUSCH that determines in the value of ACK/NACK number field not occur, the position that this reserved location is reserved on PUSCH as the ACK/NACK feedback information of the downlink transmission data of the DL Grant correspondence of losing.
Preferably, described first is operating as: described CRC and UE ID carry out with operation, perhaps, the xor operation that the two carries out.
Preferably, described eNodeB determines that the DL Grant that loses comprises: from the uplink frame of described reception, extract ACK/NACK information, with the DL Grant of NACK correspondence wherein as the DL Grant that loses.
Preferably, be noncontinuity transmission DTX if eNodeB sends downlink data to UE, when not having downlink data transmission,
This method further comprises: the CRC that UE will calculate gained carries out preassigned second operation, and operating result is carried at as new CRC sends to eNodeB in the uplink frame, and there is not ACK/NACK information in notice eNodeB in this uplink frame;
Perhaps, eNodeB puts 0 with the ACK/NACK number field, and notice UE need not carry ACK/NACK information in PUSCH, the position that described Index information is used to notify the ACK/NACK information of the described DL Grant of UE correspondence to reserve on PUCCH.
Preferably, described first that be operating as that described CRC and UE ID carry out and the operation, described second is operating as the xor operation that described CRC and UE ID carry out;
Perhaps, described first is operating as the xor operation that described CRC and UE ID carry out, described second that be operating as that described CRC and UE ID carry out and the operation.
Preferably, when UE did not have upstream data to send, this method further comprised:
ENodeB sends the descending DL Grant that replys to UE, and corresponding each DL Grant carries index Index information on the PDCCH channel, the position that is used to notify the ACK/NACK feedback information of the downlink transmission data of the described DL Grant of UE correspondence to reserve on PUCCH.
As seen from the above technical solution, among the present invention, when UE had upstream data to send, eNodeB carried the ACK/NACK number field in sending to the UL Grant of UE, was used to notify the position number or the bit number of the ACK/NACK information that UE reserves on PUSCH; ENodeB sends DLGrant to UE, and corresponding each DL Grant carries index Index information on the PDCCH channel, the position that is used to notify the ACK/NACK feedback information of the downlink transmission data of the described DL Grant of UE correspondence to reserve on PUSCH.Like this, UE can determine that just each ACK/NACK information carries the position in PUSCH.Next, UE is according to the Index information of the ACK/NACK number field of carrying among the UL Grant that receives and correct all DL Grant correspondences that receive, the ACK/NACK feedback information of the downlink transmission data of all DL Grant correspondences of correctly receiving is carried on the appointment reserved location of PUSCH, and the loss situation that judges whether to exist DL Grant according to the ACK/NACK number field that receives and Index information, if, then determine the position that the ACK/NACK feedback information of the downlink transmission data of the DL Grant correspondence of losing is reserved on PUSCH, on this position, carry nack message, and the cyclic redundancy check value CRC that calculates according to upstream data is carried out preassigned first operate, operating result is carried at as new CRC sends to eNodeB in the uplink frame.ENodeB receives the uplink frame that UE sends, and the CRC that data field calculates gained carried out described first operation, if operating result equates that with the CRC of reception then DL Grant is lost in existence, determine the DL Grant that loses, and retransmit this DL Grant and corresponding downstream data block.By with upper type, can be under the prerequisite that does not reduce up coverage, the many ACK/NACK feedbacks and the DL Grant that solve on PUSCH lose problem.
Description of drawings
Fig. 1 is the method overview flow chart of transferring ACK/nack message among the present invention.
Embodiment
For making purpose of the present invention, technological means and advantage clearer, the present invention is described in further details below in conjunction with accompanying drawing.
Basic thought of the present invention is: utilize the some bits among the UL Grant to inform that what positions UE has give in advance and insert ACK/NACK in PUSCH, and corresponding each DL Grant inserts some bits in PDCCH, informs the position that UE should insert the ACK/NACK of this DL Grant downlink data.
Fig. 1 is the method overview flow chart of transferring ACK/nack message among the present invention.As shown in Figure 1, this method comprises:
Step 101, when UE had upstream data to send, eNodeB carried the ACK/NACK number field in sending to the UL Grant of UE, be used to the position number or the bit number that are used for feeding back ACK/nack message of notifying UE to reserve on PUSCH; ENodeB sends the descending DLGrant that replys to UE, and corresponding each DL Grant carries index Index information on the PDCCH channel, the position that is used to notify the ACK/NACK feedback information of the downlink transmission data of UE DL Grant correspondence to reserve on PUSCH.
By this step, eNodeB can make the ACK/NACK feedback information of the downlink transmission data of clear and definite corresponding each DL Grant of UE transmit on which position of PUSCH.
Be described in detail with regard to above-mentioned flow process below.
At first, in step 101, in UL Grant, increase the ACK/NACK number field, the value of this ACK/NACK number field is represented, transferring ACK/nack message is come in how many bits of reservation or position in PUSCH, the bit number that concrete this ACK/NACK number field takies can be determined as required, for example takies 5 bits, then can represent to reserve 2 at most
5Transferring ACK/nack message is come in=32 bits or position.
For a system, UE and eNodeB can consult the zone that is used for transferring ACK/nack message among the PUSCH in advance, can determine that by the ACK/NACK number field both sides in this step next uplink frame is used for the shared zone of transferring ACK/NACK in this zone, be called reserved area.For example, suppose that UE and eNodeB consult the zone of the right and left of reference symbol in PUSCH as transferring ACK/nack message in advance, the value of ACK/NACK number field is 8 in this step, in the then next uplink frame, respectively reserves 4 bits or position as reserved area about reference sequences.
In addition, in step 101, also can send descending DL Grant to UE, be used to indicate the scheduling of resource situation of corresponding downlink data block, and corresponding each descending DL Grant that sends carries index (Index) information on the PDCCH channel, the position of reserving on PUSCH with the ACK/NACK feedback information of the downlink transmission data of this DL Grant correspondence of notice UE.
Particularly, the Index information of carrying on the PDCCH channel can have numerous embodiments, for example, can in DL Grant, increase DL Grant id field and carry Index information, perhaps, different and when being consecutive numbers, with the Index information of HARQ Process ID as DL Grant correspondence, Index information can be omitted like this as the HARQ of down link Process ID.Concrete which kind of mode of employing is carried Index information does not influence enforcement of the present invention, is the explanation that example is carried out following steps in first kind of mode below.
The DL Grant id field that increases in each DL Grant has identical bit number with the ACK/NACK number field among the UL Grant, the value of this field is represented, the position that the ACK/NACK information of this DL Grant corresponding downlink data block should be inserted in PUSCH, specifically can utilize the original position of this ACK/NACK information in reserved area to represent, and the ACK/NACK information of all DL Grant correspondences that send should be in reserved area sequence arrangement.For example, suppose 4 DL Grant of common transmission and corresponding downlink data block, then the Index information of carrying in these 4 DL Grant is respectively: 0,1,2,3.In addition, the data block of each DL Grant correspondence may comprise one or more data flow, in this case, each data flow needs the ACK/NACK information of corresponding feedback 1 bit, at this moment, the Index information of carrying in DL Grant is the position of ACK/NACK information in reserved area of first data flow in a plurality of data flow of this DL Grant correspondence, and the ACK/NACK information of remaining traffic is sequence arrangement after the ACK/NACK of first data flow information.Wherein, can determine the included data flow number of data block of this DL Grant correspondence according to the information of carrying among the DL Grant.
Next, in step 102, UE is according to the Index information of the ACK/NACK number field of carrying among the UL Grant that receives and correct all DL Grant correspondences that receive, and the ACK/NACK feedback information of the downlink transmission data of all DL Grant correspondences of correctly receiving is carried on the appointment reserved location of PUSCH.Concrete operations are determined reserved area according to the ACK/NACK number field among the UL Grant as previously mentioned, determine the particular location of corresponding ACK/NACK information in reserved area according to the Index information among the DL Grant again.
After UE determines reserved area according to the ACK/NACK number field, when transmit ascending data, just can not take reserved area, like this, even DL Grant loses, eNodeB can not think upstream data by mistake yet to be ACK/NACK information or ACK/NACK is used as data decode.
And, in step 102, further, judge whether to exist the situation of losing DL Grant according to the Index information of ACK/NACK number field that is received and the correct DL Grant correspondence that receives.
Judge whether that specifically the mode of losing DL Grant is:, determine the ACK/NACK information number that correct all DL Grant that receive need feed back according to all the DL Grant and the corresponding Index information thereof of correct reception; If the value of described ACK/NACK number field is unequal with the described ACK/NACK information number of determining of feedback that needs, then judge to have losing of DL Grant.
If there is the situation lose DL Grant, then in step 103, further determines the position that the ACK/NACK information of the DL Grant correspondence of losing is reserved on PUSCH, and on this position, carry nack message.
The mode of specifically determining the position that the ACK/NACK information of the DL Grant correspondence of losing is reserved on PUSCH comprises: Index information of determining all correct DL Grant correspondences that receive, and the value of this Index information and described ACK/NACK number field compared, reserved location on the PUSCH that determines in the value of ACK/NACK number field not occur, the position that this reserved location is reserved on PUSCH as the ACK/NACK feedback information of the downlink transmission data of the DL Grant correspondence of losing.
For example, three DL Grant of the correct reception of UE, the data block of each DL Grant correspondence only comprises a data flow, each self-corresponding Index information of these three DL Grant is respectively 0,1,3, and the ACK/NACK number field value of carrying in UL Grant is 4, show 4 ACK/NACK information of needs transmission, with the value of ACK/NACK number field and index information number as seen, there is 1 DL Grant to lose, and in Index information, lack original position in the reserved area and be 2, show that then this position is the position that the ACK/NACK feedback information of the downlink transmission data of the DL Grant correspondence of losing is reserved, and promptly carries nack message on this position on PUSCH.
Again for example, the ACK/NACK number field value that eNodeB carries in the UL Grant that issues is 8, and eNodeB sends 5 DL Grant altogether, and each DL Grant has 1 or 2 data flow will be transmitted.The Index information of 5 DL Grant and the data flow number that comprises are as follows:
" Index-bits "=0,1 stream of 1 DL Grant
" Index-bits "=1,2 stream of 2 DL Grant
" Index-bits "=3,2 stream of 3 DL Grant
" Index-bits "=5,1 stream of 4 DL Grant
" Index-bits "=6,2 stream of 5 DL Grant
If UE only receives four DL Grant, corresponding Index information is respectively 0,1,5,6, need then can to determine the number of the data flow of feeding back ACK/nack message is 6, that is to say that the ACK/NACK information number that the DL Grant of correct reception need feed back is 6; And the value of the ACK/NACK number field of carrying among the UL Grant is 8, and lacks in Index information that original position is 3 and 4 in the reserved area, and then UE can determine that 3 DL Grant do not receive, and carries nack message on 3 and 4 position.
In addition, in step 103, further calculating cyclic redundancy check value (CRC), and this CRC is carried out preassigned first operate, operating result is carried at as new CRC sends to eNodeB in the uplink frame, there is the situation of losing DL Grant in eNodeB with notice.
Particularly, first operation can be any operation that UE and eNodeB consult in advance.Preferably, can be that CRC and UE ID are carried out logical operation, as with operation, xor operation etc.Here, because usually CRC is 16, and UE ID also is 16, and the result who carries out after the logical operation is still 16, therefore notifies eNodeB to have the situation of losing DL Grant in this way, can not need to increase extra information bit.In addition, in uplink frame, each the ACK/NACK information that need transmit only takies 1 bit or 1 position, can guarantee not influence up coverage.
Operation in the step 104 is identical with existing mode, just repeats no more here.
In step 105, eNodeB receives uplink frame, and calculating CRC, if calculating the CRC of gained equates with the CRC of reception, then show the situation of losing DL Grant that do not exist, can in step 107, handle this uplink frame according to the mode of prior art, and the method ends flow process, otherwise execution in step 106.
In step 106, the CRC that calculates gained is carried out first operation identical with UE, if operating result equates that with the CRC of reception then the situation of DL Grant is lost in existence, and determine the DL Grant that loses to retransmit this DL Grant and corresponding downstream data block.
Particularly, if adopt foregoing operation in UE, be about to CRC and UE ID and carry out logical operation, then this step is also carried out identical logical operation.When determine existing when losing the situation of DL Grant, the ACK/NACK information that the eNodeB decoding receives, with the DL Grant of NACK correspondence wherein as the DL Grant that loses.Here, there is any it should be noted that: eNodeB decoding ACK/NACK information, thereby what determine which reserved location feedback is nack message, but in fact, for the position of feedback nack message, its corresponding DL Grant may not lose, just its feedack is NACK, and for this class situation, whether the DL Grant that can't distinguish the nack message correspondence in the manner described above really loses, if further distinguish, need extra signaling support.After determining the pairing DL Grant of feedback nack message, this DL Grant and corresponding downlink data block thereof are retransmitted.Concrete re-transmission mode is carried out according to the standard operation of HARQ, just repeats no more here.
So far, transferring ACK of the present invention/nack message method flow finishes.
For illustrating that better eNodeB is handed down to the ACK/NACK number field of UE and the relation between Index information, and the information that the two reflected, below specify for example.
Suppose in the LTE TDD system, the ACK/NACK information bit that feeds back in uplink frame is 18 to the maximum, ACK/NACK number field that then increases in UL Grant and the Index information that increases in DL Grant take 5 bits, are used to refer to concrete bit number and the particular location of each ACK/NACK information in PUSCH that needs the ACK/NACK information of reservation respectively.
The ratio of supposing descending time slot and ascending time slot is 4: 1, if each DL Grant corresponding downlink data block only comprises a data flow, then the value of ACK/NACK number field and Index information is as follows respectively:
| ACK/NACK number field value (0b00100) among the UL grant | ?4 |
| Index information (0b00000) among the DL grant 1 | ?0 |
| Index information (0b00001) among the DL grant 2 | ?1 |
| Index information (0b00010) among the DL grant 3 | ?2 |
| Index information (0b00011) among the DL grant 4 | ?3 |
If each DL Grant corresponding downlink data block comprises two data flow, then the value of ACK/NACK number field and Index information is as follows respectively:
| ACK/NACK number field value (0b01000) among the UL grant | ?8 |
| Index information (0b00000) among the DL grant 1 | ?0 |
| Index information (0b00010) among the DL grant 2 | ?2 |
| Index information (0b00100) among the DL grant 3 | ?4 |
| Index information (0b00110) among the DL grant 4 | ?6 |
If each DL Grant corresponding downlink data block may comprise one or two data flow, then the value of ACK/NACK number field and Index information may be as follows:
| ACK/NACK number field value (0b01000) among the UL grant | ?8 |
| 1 data flow of Index information (0b00000) among the DL grant 1 | 0 |
| 2 data flow of Index information (0b00010) among the DL grant 2 | 1 |
| 1 data flow of Index information (0b00100) among the DL grant 3 | 3 |
| 2 data flow of Index information (0b00110) among the DL grant 4 | 4 |
| 2 data flow of Index information (0b00110) among the DL grant 5 | 6 |
By the transmission method of the invention described above as seen, among the present invention, on the one hand, utilize UL Grant to reserve enough bits, thereby avoid because of losing the problem that upstream data that DL Grant causes and ACK/NACK information are obscured for the ACK/NACK information of needs transmission.On the other hand, that utilizes the corresponding ACK/NACK information of Index information notice UE specifically carries the position, thereby can make UE determine that the corresponding A CK/NACK of the DL Grant institute information of losing carries the position in PUSCH, guarantee eNodeB correctly the DL Grant and the corresponding downlink data block thereof of retransmission of lost.Simultaneously, in PUSCH, the ACK/NACK information of each DL Grant correspondence only takies 1 bit, therefore can not dwindle up coverage.
In addition, in the method for the invention, be noncontinuity transmission (DTX) if eNodeB sends downlink data to UE, when not having downlink data transmission,
If one still wishes to reserve the position of ACK/NACK information, then can be in the following way: eNodeB still be changed to the ACK/NACK number field on UL Grant and wants the number that keeps.The CRC that UE will calculate gained carries out preassigned second operation, and operating result is carried at as new CRC sends to eNodeB in the uplink frame, there is not ACK/NACK information in notice eNodeB in this uplink frame, after eNodeB receives uplink frame, if determine the accordingly result of CRC, then determine not have ACK/NACK information in this uplink frame for obtaining through second operation; Wherein second operation also is that UE and eNodeB consult in advance, and belongs to different action types with aforementioned first operation.For example, can be that CRC and UE ID carry out and operation with first operation setting, be that CRC and UE ID carry out xor operation with second operation setting; Perhaps, be that CRC and UE ID carry out xor operation with first operation setting, be that CRC and UE ID carry out and operation with second operation setting.
Two, eNodeB is when issuing UL Grant, initiatively the ACK/NACK number field is put 0, notice UE need not carry ACK/NACK information in PUSCH, wherein Index information is used to notify the position that the ACK/NACK information of the described DL Grant of UE correspondence is reserved on PUCCH, and concrete occupation mode as hereinbefore.
In addition, the method of the invention described above is implemented all under the situation that has PUSCH, ACK/NACK information is carried at situation when uploading among the PUSCH, when eNodeB does not distribute PUSCH for UE, UE is carried at upward transmission of up shared control channel (PUCCH) with the ACK/NACK information of feedback, at this moment, also can be according to the mode of the invention described above, corresponding each DL Grant carries Index information on PDCCH, identifies the particular location that the ACK/NACK information of this DL Grant correspondence is transmitted on PUCCH.Simultaneously, the present invention is suitable equally to transmitting a plurality of data flow in the mimo system simultaneously and losing the situation of partial data stream wherein.
Being preferred embodiment of the present invention only below, is not to be used to limit protection scope of the present invention.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 (11)
1. the method for a transferring ACK/nack message is characterized in that, this method comprises:
When user terminal UE has upstream data to send, enhanced base station eNodeB carries up feeding back ACK/NACK number field in sending to the up UL of the replying Grant of UE, be used to notify UE to remain for the position number or the bit number of feeding back ACK/nack message in advance on PUSCH; ENodeB sends the descending DL Grant that replys to UE, and corresponding each DL Grant carries index Index information on the PDCCH channel, the position that is used to notify the ACK/NACK feedback information of the downlink transmission data of the described DL Grant of UE correspondence to reserve on PUSCH;
UE is according to the ACK/NACK number field of carrying among the UL Grant that receives and correct all DL Grant that receive and corresponding Index information thereof, wrong feedback information is carried at the ACK/NACK of all DL Grant corresponding downlink data of correctly receiving on the appointment reserved location of PUSCH, and the loss situation that judges whether to exist DL Grant according to the ACK/NACK number field and the Index information of described reception, if, then determine the position that the ACK/NACK information of the DL Grant correspondence of losing is reserved on PUSCH, on this position, carry nack message, and the cyclic redundancy check value CRC that calculates according to upstream data is carried out preassigned first operate, operating result is carried at as new CRC sends to eNodeB in the uplink frame;
ENodeB receives the described uplink frame that UE sends, and the CRC that calculates gained according to upstream data is carried out described first operate, if operating result equates that with the CRC of reception then DL Grant is lost in existence, determine the DL Grant that loses, and retransmit this DL Grant and corresponding downstream data block.
2. method according to claim 1 is characterized in that, described on the PDCCH channel corresponding each DL Grant carry Index information and comprise:
In DL Grant, increase DL Grant id field and carry Index information;
Perhaps, different and when being consecutive numbers as the HARQ of down link Process ID, and different data flow is corresponding to different HARQ Process ID, with the Index information of described HARQ Process ID as the DLGrant correspondence.
3. method according to claim 1 is characterized in that, determines ACK/NACK reserved area on the PUSCH according to the ACK/NACK number field that receives.
4. method according to claim 3 is characterized in that, the original position of ACK/NACK feedback information in described ACK/NACK reserved area of the downlink transmission data of the described DL Grant of described Index message identification correspondence.
5. method according to claim 1 is characterized in that, described Index information according to the ACK/NACK number field that receives, all DL Grant and correspondence thereof judges whether to exist the loss situation of DL Grant to comprise:
According to all the DL Grant and the corresponding Index information thereof of correct reception, determine the ACK/NACK information number that correct all DL Grant that receive need feed back;
If the value of described ACK/NACK number field is unequal with the described ACK/NACK information number of determining of feedback that needs, then judge to have losing of DL Grant.
6. method according to claim 1 is characterized in that, the position that the described ACK/NACK information of determining the DL Grant correspondence of losing is reserved on PUSCH comprises:
Determine the Index information of all correct DL Grant correspondences that receive, and the value of this Index information and described ACK/NACK number field compared, reserved location on the PUSCH that determines in the value of ACK/NACK number field not occur, the position that this reserved location is reserved on PUSCH as the ACK/NACK feedback information of the downlink transmission data of the DL Grant correspondence of losing.
7. method according to claim 1 is characterized in that, described first is operating as: described CRC and UE ID carry out with operation, perhaps, the xor operation that the two carries out.
8. method according to claim 1 is characterized in that, described eNodeB determines that the DL Grant that loses comprises: from the uplink frame of described reception, extract ACK/NACK information, with the DL Grant of NACK correspondence wherein as the DL Grant that loses.
9. method according to claim 1 is characterized in that, is noncontinuity transmission DTX if eNodeB sends downlink data to UE, when not having downlink data transmission,
This method further comprises: the CRC that UE will calculate gained carries out preassigned second operation, and operating result is carried at as new CRC sends to eNodeB in the uplink frame, and there is not ACK/NACK information in notice eNodeB in this uplink frame;
Perhaps, eNodeB puts 0 with the ACK/NACK number field, and notice UE need not carry ACK/NACK information in PUSCH, the position that described Index information is used to notify the ACK/NACK information of the described DL Grant of UE correspondence to reserve on PUCCH.
10. method according to claim 9 is characterized in that,
Described first that be operating as that described CRC and UE ID carry out and the operation, described second is operating as the xor operation that described CRC and UE ID carry out;
Perhaps, described first is operating as the xor operation that described CRC and UE ID carry out, described second that be operating as that described CRC and UE ID carry out and the operation.
11. method according to claim 1 is characterized in that, when UE did not have upstream data to send, this method further comprised:
ENodeB sends the descending DL Grant that replys to UE, and corresponding each DLGrant carries index Index information on the PDCCH channel, the position that is used to notify the ACK/NACK feedback information of the downlink transmission data of the described DL Grant of UE correspondence to reserve on PUCCH.
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