CN101369878B - Synchronous mixing automatic retransmission request method and apparatus in TDD system - Google Patents
Synchronous mixing automatic retransmission request method and apparatus in TDD system Download PDFInfo
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Abstract
The invention discloses a synchronized combined automatic repeat request method in a time division duplexing system comprising: when the minimum HARQ round trip time length is not an integral multiple of a frame time length, the HARQ round trip time length is arranged as a minimum integral multiple of a frame time length larger than the minimum HARQ round trip time length; an HARQ process is bond on a time slot according to the setting HARQ round trip time length for transmission. The invention also discloses another synchronized combined automatic repeat request method in the time division duplexing system comprising: when apart HARQ processes treat the time slot of the time length and generate conflict, the HARQ retransmission can not be conducted, the nearest usable time slot arranged after the treatment of time length of the apart HARQ processes is a retransmission time slot; the HARQ retransmission is conducted on the setting retransmission time slot. The invention also discloses two corresponding devices. The HARQ round trip time is shortened and the transmission performance of the HARQ is improved by using the invention.
Description
Technical field
The present invention relates to wireless communication technology field, particularly a kind of tdd systems (TimeDivision Duplex, TDD) middle synchronous hybrid automatic repeat request (Hybrid Automatic RepeatRequest, HARQ) method and apparatus.
Background technology
At third generation partner program (3rd Generation Partnership Project; The high speed downlink packet that 3GPP) is proposed inserts (High Speed Downlink Packet Access; HSDPA) and high speed uplink packet insert (High Speed Uplink Packet Access; HSUPA) in, and following Long Term Evolution (Long Term Evolution, LTE) in the works; For the data block to error of transmission is fed back re-transmission fast, adopt HARQ as a kind of solution preferably.
A lot of systems, HSDPA for example, the HSUPA and following LTE adopt that multidiameter delay stops and wait the HARQ agreement.What is called is stopped etc., refer to use certain HARQ process transmission packet exactly after, before receiving feedback information, can not continue to use other any data of this process transmission.The advantage of stop-and-wait protocol is fairly simple, but efficiency of transmission is lower.And adopt the multidiameter delay stop-and-wait protocol, and dispose a plurality of HARQ processes simultaneously, in the feedback information process of certain HARQ process of wait, can continue to use other idle process transmits data packets, like this, can remedy the low shortcoming of efficiency of transmission.But,, must use identical HARQ process to retransmit, so that data receiver merges the data block of makeing mistakes for the data block of loading error occurring.
According to the moment of retransmit taking place predefine whether, can HARQ be divided into two kinds of synchronous HARQ and asynchronous HARQ.Wherein in asynchronous HARQ, the retransmission time of data block is not predefined, but is dynamically determined by scheduler, the HARQ process numbering (id) that therefore needs explicitly notice receiving terminal data block to use.And retransmission time is predefined in the synchronous HARQ, with transmission first the time be carved with fixing sequential relationship, therefore its HARQ process id can not need explicit signaling consumption through the expression of timing relationship implicit expression.
In the FDD system, the data of uplink and downlink all are to carry out simultaneously, transmit continuously, that is to say that upstream or downstream independently take certain frequency resource respectively and transmit continuously.HARQ Packet Data Unit (Packet Data Unit, the time span that once transmission PDU) takies resource be called Transmission Time Interval (Transmission Time Interval, TTI).Among the FDD system synchronization HARQ; According to the device processes ability confirm from use certain HARQ process transmission data, to receiving the ACK/NACK feedback information and can reusing time interval of these process transmission data; Promptly come and go duration (Round TripTime is designated as HARQ_RTT below).With the descending example that is transmitted as, the HARQ process id that each TTI is corresponding (below be designated as HARQ process id) obtains the HARQ_RTT delivery for number (below be designated as TTI Number) through TTI, that is:
HARQ?process?id＝(TTI?Number)mod(HARQ_RTT)
For example, TTI is numbered from 0 to N, when HARQ_RTT=4TTI, and corresponding relation such as the following table of TTI numbering and HARQ process id:
| TTI? |
0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | ... | ?N |
| HARQ?process? |
0 | 1 | 2 | 3 | 0 | 1 | 2 | 3 | ... | ?(TTI?Number)mod(HARQ_RTT) |
TTI numbering and HARQ process numbering mapping table in the table 1.FDD system
In the TDD system, identical frequency resource is used in the uplink and downlink timesharing, and the transfer of data of up-downgoing all is discontinuous.The minimal data Transmission Time Interval, promptly the shortest TTI is a time slot.
Fig. 1 shows the example of a kind of frame structure of TDD, in this example, comprises 5 time slots in the time span Sp of a frame, is numbered 0 to 4, and is divided into ascending time slot and descending time slot.Time slot transfer point DUSP and UDSP are respectively applied for indicating downlink to ascending time slot and the conversion that is up to descending time slot constantly.DUSP and UDSP can according to circumstances adjust between different time-gap, thereby cause different uplink and downlink timeslot ratios.
Fig. 2 shows the example of the another kind of frame structure of TDD, in this example, comprises 10 time slots in the time span Sp of a frame, is numbered 0 to 9, and DUSP and UDSP are like position among the figure.
In the TDD system, as noted earlier, the length of TTI is a time slot; If method definition synchronous HARQ according to FDD; Confirm HARQ_RTT earlier, through TTI Number the method for HARQ_RTT delivery is confirmed HARQ process id again, may be owing to the conversion of uplink and downlink timeslot; Cause process unavailable, retransmit thereby postpone.This conflict is as shown in Figure 3, and wherein, HARQ_RTT=3TTI, each Frame comprise and be numbered 5 time slots of 0 to 4, and wherein preceding two is ascending time slot, and back three is descending time slot.If according to the mode of FDD, be that 0 HARQ_PDU carries out uplink as TTI Number on 0 time slot of Frame N, this HARQ process id is 0.Then transmission next time should after HARQ process id transmit on 0 the time slot, promptly the time slot 3 at Frame N transmits.But the time slot 3 of Frame N is a descending time slot, can not carry out uplink, and can only on ensuing HARQ process id is 0 time slot, transmit, promptly in time slot 1 transmission of Frame N+1.Like this, postponed the HARQ transmission time.And, the HARQ of different processes, its HARQ_RTT is different.
Because in the TDD system, HARQ_RTT not only receives the influence of device processes time delay, also receives the position effects of up-downgoing transfer point; Therefore; In the prior art,, tend to according to the device processes time delay in order to simplify the synchronous HARQ scheme in the TDD system; As HARQ_RTT, and time-gap number and process id have binding relationship with a kind of multiple of Frame length.Is example greater than a frame duration less than two frame durations with handling duration; With regard to up; As shown in Figure 4, the HARQ_RTT of each HARQ process is set to 2 times Frame length, and the corresponding respectively HARQ Process id of two ascending time slots that is numbered the Frame of odd number is 1,2; The corresponding respectively HARQ Process id of two ascending time slots that is numbered the Frame of even number is 3,4.Like this, not only realize simply, and avoided the possibility that clashes.
But, this method that prior art adopts, the HARQ_RTT that each HARQ process is set is the same; And all greater than the device processes duration, but the HARQ process on the different time-gap, and its device processes duration possibly be different; Its device processes duration of HARQ process possibility on the time slot that has is shorter, that is to say, although the unified HARQ_RTT that is provided with of prior art; And do not distinguish according to the HARQ process on each time slot, particularly for the short HARQ process of device processes duration, still adopt consistent with other HARQ process and long HARQ_RTT; Like this, can significantly reduce its HARQ transmission performance.
Summary of the invention
The purpose of this invention is to provide synchronous hybrid automatic repeat request method and apparatus in a kind of tdd systems, to overcome the low shortcoming of the transmission performance of HARQ in the prior art.
For solving the problems of the technologies described above, the present invention provides that the synchronous hybrid automatic repeat request method and apparatus is achieved in that in a kind of tdd systems
Synchronous hybrid automatic repeat request method in a kind of tdd systems comprises:
When the round duration of the minimum of a certain time slot HARQ process is not equal to the integral multiple of a frame duration, HARQ is set comes and goes duration for come and go the doubly individual frame duration of smallest positive integral of duration greater than this minimum HARQ;
The HARQ process is come and gone duration according to the HARQ that is provided be bundled on the time slot, carry out the HARQ transmission.
Said the HARQ process is come and gone before duration is bundled on the time slot according to the HARQ that is provided with, this method also comprises:
When the round duration of minimum HARQ equals the integral multiple of a frame duration, the round duration of HARQ is set comes and goes duration for this minimum HARQ.
The said HARQ process is bundled on the time slot according to the round duration of the HARQ that is provided with realized by following mode:
For a time slot in the frame the process number that will bind, through the sequence number of the frame at this time slot place is come and gone the number delivery of frame length that duration comprises according to HARQ, according to the sequence number setting of gained remainder and this time slot.
Synchronous hybrid automatic repeat request method in a kind of tdd systems comprises:
When the time slot of the HARQ process handling duration of being separated by clashes and can't carry out HARQ when retransmitting, be set in nearest available time slot after the HARQ process handling duration of being separated by for retransmitting time slot;
On the re-transmission time slot of setting, carrying out HARQ retransmits.
This method also comprises: when HARQ process handling duration equaled the integral multiple of a frame duration, the time slot of setting the HARQ process handling duration of being separated by was for retransmitting time slot.
Said setting retransmits time slot and is realized by following mode:
Be separated by the time slot of HARQ process handling duration when being not ascending time slot with the uplink time slot, set nearest ascending time slot after the HARQ process handling duration of being separated by for retransmitting time slot.
Said setting retransmits time slot and is realized by following mode:
Be separated by the time slot of HARQ process handling duration when being not descending time slot with the downlink transfer time slot, set nearest descending time slot after the HARQ process handling duration of being separated by for retransmitting time slot.
Synchronous hybrid automatic repeat request device in a kind of tdd systems comprises that HARQ comes and goes duration unit 91 is set, and binds unit 92 and HARQ transmission unit 93, wherein,
HARQ comes and goes duration unit 91 is set, and is used for when the round duration of the minimum of a certain time slot HARQ process is not equal to the integral multiple of a frame duration, HARQ is set comes and goes duration for come and go the doubly individual frame duration of smallest positive integral of duration greater than this minimum HARQ;
Bind unit 92, with the round duration of HARQ unit 91 is set and links to each other, be used for that the HARQ process is come and gone duration according to the HARQ that is provided with and be bundled in time slot;
HARQ transmission unit 93 links to each other with binding unit 92, is used on the time slot of binding, carrying out the HARQ transmission.
When minimum HARQ came and went duration and equals the integral multiple of a frame duration, HARQ came and went duration and unit 91 is set HARQ also is set comes and goes duration and come and go duration for this minimum HARQ.
For a time slot in the frame the process number that will bind, said binding unit 92 comes and goes the duration delivery through the sequence number with the frame at this time slot place according to HARQ, according to gained remainder and the setting of time slot sequence number.
Synchronous hybrid automatic repeat request device in a kind of tdd systems comprises conflict judging unit 101, retransmits time slot table unit 102, HARQ transmission unit 103, wherein,
Retransmit time slot table unit 102; Be used for setting re-transmission time slot table; Judge that at conflict judging unit 101 time slot of the HARQ process handling duration of being separated by clashes and can't carry out HARQ when retransmitting, retransmitting time slot in this table is the nearest available time slot after the HARQ process handling duration of being separated by;
Said re-transmission time slot table unit 102 also is used for when conflict judging unit 101 judges that HARQ process handling duration equals the integral multiple of a frame duration, and the time slot of setting the HARQ process handling duration of being separated by retransmits the re-transmission time slot in the time slot table.
Judge with the uplink time slot at conflict judging unit 101 and to be separated by the time slot of HARQ process handling duration when being not ascending time slot, retransmit time slot table unit 102 and set nearest ascending time slot after the HARQ process handling duration of being separated by for retransmitting the re-transmission time slot in the time slot table.
Judge with the downlink transfer time slot at conflict judging unit 101 and to be separated by the time slot of HARQ process handling duration when being not descending time slot, retransmit time slot table unit 102 and set nearest descending time slot after the HARQ process handling duration of being separated by for retransmitting the re-transmission time slot in the time slot table.
Visible by above technical scheme provided by the invention, when the round duration of minimum HARQ is not equal to the integral multiple of a frame duration, HARQ is set comes and goes duration for come and go the doubly individual frame duration of smallest positive integral of duration greater than this minimum HARQ; The HARQ process is come and gone duration according to the HARQ that is provided be bundled on the time slot, carry out the HARQ transmission, like this; Handling duration according to the HARQ process is provided with its round duration, can shorten HARQ and come and go duration, thereby improve the HARQ transmission performance; And; The HARQ process is come and gone duration according to the HARQ that is provided be bundled on the time slot, carry out the HARQ transmission, each time slot of each frame can reasonably be bound the HARQ process.
Description of drawings
Fig. 1 is a kind of frame assumption diagram of tdd systems;
Fig. 2 is the another kind of frame assumption diagram of tdd systems;
Time slot collision sketch map when Fig. 3 carries out the HARQ transmission for tdd systems according to frequency division duplex system HARQ mode;
Fig. 4 is for coming and going the sketch map that duration carries out the HARQ transmission with integral multiple HARQ in the tdd systems;
Fig. 5 is the relation of the transmission time sequence in the frame structure in the tdd systems;
Fig. 6 is the flow chart of the present invention first method embodiment;
Fig. 7 is the design sketch of the present invention first method embodiment;
Fig. 8 is the flow chart of the present invention second method embodiment;
Fig. 9 is the block diagram of the present invention first device embodiment;
Figure 10 is the block diagram of the present invention second device embodiment.
Embodiment
The present invention provides synchronous hybrid automatic repeat request method in a kind of tdd systems; When the round duration of minimum HARQ is not equal to the integral multiple of a frame duration; HARQ is set comes and goes duration for come and go the doubly individual frame duration of smallest positive integral of duration greater than this minimum HARQ; The HARQ process is come and gone duration according to the HARQ that is provided be bundled on the time slot, carry out the HARQ transmission.
Below introduce the transmission time sequence relation (above behavior example) under the tdd frame structure earlier, as shown in Figure 5, establishing each slot length is 1ms, wherein:
DATA: uplink transmission block, propagation delay time are 1 time slot, i.e. 1ms;
ACK/NACK: base station (eNB) feedback, propagation delay time is 1 time slot, i.e. 1ms;
Tp: one way propagation time delay;
Tenb:eNB receives the processing delay behind the upstream data, is made as 3ms;
Tue: terminal (UE) receives the processing delay after the eNB feedback, is made as 3ms;
Because the characteristic that tdd frame structure uplink and downlink timeslot is staggered; After eNB handles uplink transmission block; Must wait until that descending time slot just can feed back, likewise, after UE handles capable eNB feedback; Must wait until that also ascending time slot just can retransmit or new transmission, therefore introduce Tdelay1 and Tdelay2:
After Tdelay1:eNB handles uplink transmission block, to the time that descending time slot need be waited for;
In the prior art, after eNB handles uplink transmission block, can after nearest descending time slot send feedback message, also can after other descending time slots on send feedback message; Provide among Fig. 5 be eNB handle behind the uplink transmission block after the nearest descending time slot situation of sending feedback message.
After Tdelay2:UE handles the eNB feedback, to the nearest time that ascending time slot must be waited for.
HARQ_RTTmin: the minimum interval between adjacent twice transmitting uplink data.Promptly the shortest HARQ_RTT.Can represent as follows with formula:
HARQ_RTTmin＝DATA+Tenb+Tdelay1+ACK/NACK+Tp+Tue+Tdelay2+Tp
The situation of the transmitting uplink data of only having given an example out above.It should be noted, under the situation of downlink transfer, similarly, HARQ_RTTmin can represent the minimum interval between adjacent twice downlink data transmission, HARQ_RTT can represent the time interval between adjacent twice downlink data transmission.
Below, HARQ_RTTmin is called minimum HARQ comes and goes duration.
Among Fig. 5, when the time slot 1 (HARQ process 1) that is transmitted in Frame N when the preceding ascending HARQ of UE takes place, because the processing delay Tenb that eNB receives behind the upstream data need take 3ms; The downstream feedback of eNB will can be carried out at the time slot 0 of Frame N+1 the earliest; Because the processing delay Tue that UE receives after eNB feeds back need take 3ms, still the 0th time slot of Frame N+2 is a descending time slot at this moment, can not carry out uplink afterwards; Therefore; The uplink of the UE in back will can be carried out at the time slot 1 of Frame N+2 the earliest, at this moment
HARQ_RTTmin＝DATA+Tenb+ACK/NACK+Tp+Tue+Tdelay2+Tp＝10ms；
When the preceding ascending HARQ of UE is transmitted in time slot 2 (the HARQ process 2) generation of Frame N; The downstream feedback of eNB will can be carried out at the time slot 0 of Frame N+2 the earliest; The uplink of a UE then will can be carried out at the time slot 1 of Frame N+3 the earliest, at this moment HARQ_RTTmin=DATA+Tenb+Tdelay1+ACK/NACK+Tp+Tue+Tdelay2+Tp=14ms;
When the preceding ascending HARQ of UE is transmitted in time slot 3 (the HARQ process 3) generation of Frame N; The downstream feedback of eNB will can be carried out at the time slot 0 of Frame N+2 the earliest; The uplink of a UE then will can be carried out at the time slot 1 of Frame N+3 the earliest, at this moment HARQ_RTTmin=DATA+Tenb+Tdelay1+ACK/NACK+Tp+Tue+Tdelay2+Tp=13ms;
When the preceding ascending HARQ of UE is transmitted in time slot 4 (the HARQ process 4) generation of Frame N; The downstream feedback of eNB will can be carried out at the time slot 0 of Frame N+2 the earliest; The uplink of a UE then will can be carried out at the time slot 1 of Frame N+3 the earliest, at this moment HARQ_RTTmin=DATA+Tenb+Tdelay1+ACK/NACK+Tp+Tue+Tdelay2+Tp=12ms.
Adopt existing synchronous HARQ implementation method; For the above-mentioned required minimum treat time of different HARQ processes, the necessary unified HARQ_RTT that adopts 15ms is if promptly UE carries out the ascending HARQ transmission at the time slot m of Frame N; Then HARQ transmission next time can only be carried out at the time slot m of Frame N+3; Like this, compare with each time slot the shortest adoptable HARQ_RTT among Fig. 5, this scheme has obviously reduced the performance of system.
Below introduce first embodiment of method provided by the invention.Fig. 6 shows the flow process of the inventive method first embodiment.As shown in the figure, the first method embodiment comprises:
Step 601: when the round duration of minimum HARQ is not equal to the integral multiple of a frame duration, HARQ is set comes and goes duration for come and go the doubly individual frame duration of smallest positive integral of duration greater than this minimum HARQ.
Here, the round duration of minimum HARQ promptly refers to top HARQ_RTTmin.
In addition, when the round duration of minimum HARQ equals the integral multiple of a frame duration, the round duration of HARQ can also be set come and go duration for this minimum HARQ.
In the existing frame, the position of UDSP and DUSP can change, in case but the position of UDSP and DUSP confirms that uplink and downlink timeslot is confirmed, and generally can't dynamically be changed thereupon.Therefore, when minimum HARQ comes and goes duration and equals the integral multiple of a frame duration, can fix HARQ is set comes and goes duration and handle for this HARQ process the time.
Be example still, that is: with the round handling duration of the minimum HARQ of each HARQ process among Fig. 5
It is 10ms that the minimum HARQ of time slot 1 (process 1) comes and goes duration;
It is 14ms that the minimum HARQ of time slot 2 (process 2) comes and goes duration;
It is 13ms that the minimum HARQ of time slot 3 (process 3) comes and goes duration;
It is 12ms that the minimum HARQ of time slot 4 (process 4) comes and goes duration.
Because a Frame duration is 5ms, therefore, the round duration of the minimum HARQ of time slot 1 is 2 times a Frame duration, and according to the mode in this step, the HARQ of HARQ process 1 comes and goes duration, and promptly HARQ1_RTT is set to 10ms.
And the round duration of the minimum HARQ of time slot 2 is 14ms; It is not the integral multiple of a Frame duration, and according to the mode in this step, the HARQ of HARQ process 2 comes and goes duration; Be that HARQ2_RTT is set to the smallest positive integral Frame duration greater than 14ms (HARQ_RTTmin of time slot 2), be 15ms.
Likewise; It is 13ms that the minimum HARQ of time slot 3 comes and goes duration; It is not the integral multiple of a Frame duration, and according to the mode in this step, the HARQ of HARQ process 3 comes and goes duration; Be that HARQ3_RTT is set to the smallest positive integral Frame duration greater than 13ms (HARQ_RTTmin of time slot 3), be 15ms.
Likewise; It is 12ms that the minimum HARQ of time slot 4 comes and goes duration; It is not the integral multiple of a Frame duration, and according to the mode in this step, the HARQ of HARQ process 4 comes and goes duration; Be that HARQ4_RTT is set to the smallest positive integral Frame duration greater than 12ms (HARQ_RTTmin of time slot 4), be 15ms.
This step also can utilize formula according to following expression:
The minimum of a certain time slot HARQ process comes and goes duration and is designated as HARQ_RTTmin, always has the * Sp of M*Sp＜HARQ_RTTmin≤(M+1), and wherein Sp is a Frame duration, and M is>=1 integer, and HARQ_RTT=(M+1) the * Sp of this time slot then is set
Step 602: the HARQ process is come and gone duration according to the HARQ that is provided be bundled on the time slot, carry out the HARQ transmission.
In this step, time slot and HARQ process are bound, so similar with prior art, therefore HARQ process id can not need explicit signaling consumption through the expression of timing relationship implicit expression.
Concrete, as will to bind for the institute of a certain time slot in a certain frame process number can come and go the number delivery of frame length that duration comprises according to HARQ with the sequence number of the frame at this time slot place, according to remainder with belong to different setting of time slot sequence number.
Still coming and going duration with each the minimum HARQ among Fig. 5 is example, establishes the Hn that is numbered of Frame, this moment through Frame and time slot confirm HARQ Process id regular as follows:
During Hn mod 2=0:
This frame slot 1 corresponding HARQ instance Process (1);
During Hn mod 2=1:
This frame slot 1 corresponding HARQ instance Process (2);
During Hn mod 3=0:
This frame slot 2 corresponding HARQ instance Process (3);
This frame slot 3 corresponding HARQ instance Process (4);
This frame slot 4 corresponding HARQ instance Process (5);
During Hn mod 3=1:
This frame slot 2 corresponding HARQ instance Process (6);
This frame slot 3 corresponding HARQ instance Process (7);
This frame slot 4 corresponding HARQ instance Process (8);
During Hn mod 3=2:
This frame slot 2 corresponding HARQ instance Process (9);
This frame slot 3 corresponding HARQ instance Process (10);
This frame slot 4 corresponding HARQ instance Process (11);
In a word, as Hn mod (M+1)=0, during 1...M, the HARQProcess that this time slot is corresponding different respectively.
The HARQ that Fig. 7 shows after above-mentioned steps 601 and 602 is carried out transmits and the time slot binding result.Like this, the HARQ process of different time-gap can be transmitted with less round duration, and each time slot of each frame has all reasonably been bound the HARQ process.
Visible by the foregoing description, when the round duration of minimum HARQ equals the integral multiple of a frame duration, the round duration of HARQ is set comes and goes duration for this minimum HARQ; When the round duration of minimum HARQ is not equal to the integral multiple of a frame duration; HARQ is set comes and goes duration for come and go the doubly individual frame duration of smallest positive integral of duration greater than this minimum HARQ; Like this; Handling duration according to the HARQ process is provided with its round duration, can shorten HARQ and come and go duration, thereby improve the HARQ transmission performance.And, the HARQ process is come and gone duration according to the HARQ that is provided be bundled on the time slot, carry out the HARQ transmission, each time slot of each frame can reasonably be bound the HARQ process.
Below introduce second embodiment of method provided by the invention.The second method embodiment comprises:
Clash and can't carry out HARQ when retransmitting at the time slot of the HARQ process handling duration of being separated by, be set in nearest available time slot after the HARQ process handling duration of being separated by for retransmitting time slot;
On the re-transmission time slot of setting, carrying out HARQ retransmits.
Top HARQ process handling duration comes and goes duration for the minimum HARQ that does not comprise Tdelay2, after promptly UE handles the feedback of eNB, does not consider to wait for the time of a nearest ascending time slot.Can represent as follows with formula:
HARQ process handling duration=DATA+Tenb+Tdelay1+ACK/NACK+Tp+Tue+Tp.
And can also comprise: when HARQ process handling duration equaled the integral multiple of a frame duration, the time slot of setting the HARQ process handling duration of being separated by was for retransmitting time slot.
When HARQ process handling duration equals the integral multiple of a frame duration, similar with the front, on the time slot of HARQ process handling duration of being separated by, carry out HARQ and retransmit.The front is also mentioned, in the existing frame, in case the position of UDSP and DUSP confirms that uplink and downlink timeslot is confirmed, and generally can't be changed thereupon.Therefore, when HARQ process handling duration equaled the integral multiple of a frame duration, the HARQ that on the time slot of HARQ process handling duration of being separated by, carries out that can fix retransmitted.
Concrete, can be divided into ascending time slot and descending time slot.Above-mentioned time slot at the HARQ process handling duration of being separated by clashes and can't carry out HARQ when retransmitting, and comprises above-mentionedly, because the different conflicts that cause of up-downgoing type, and then can't carry out the HARQ re-transmission at the time slot of the HARQ process handling duration of being separated by.So, by following two kinds of situation:
Be separated by the time slot of HARQ process handling duration when being not ascending time slot with the uplink time slot, set nearest ascending time slot after the HARQ process handling duration of being separated by for retransmitting time slot.
Be separated by the time slot of HARQ process handling duration when being not descending time slot with the downlink transfer time slot, set nearest descending time slot after the HARQ process handling duration of being separated by for retransmitting time slot.
Be example still, that is: with each HARQ process handling duration among Fig. 5
Fig. 8 shows the result of the inventive method second embodiment.As shown in Figure 8, each HARQ process can meet the rule shown in the following table:
The mapping table of table 2.HARQ process and frame and time slot
Thus it is clear that, all adopt the shortest HARQ_RTT between adjacent twice transmission, to reach the maximum performance of system.UE will transmit according to predefined transmission time sequence.As for HARQ process 1, its HARQ_RTT is fixed as 2 frame durations, and UE transmits at the time slot 1 of Frame N, so, will carry out first time HARQ at the time slot 1 of Frame N+2 and retransmit.Again for example for HARQ process 3; UE has carried out initial transmission at the time slot 3 of Frame N, so, will carry out at the time slot 1 of Frame N+3 retransmitting the first time; Retransmit for the second time and will carry out, retransmit for the third time and will carry out at the time slot 1 of Frame N+7 at the time slot 1 of Frame N+5.Only provided the signal that each ascending time slot of Frame N once transmits among Fig. 8.
Different with method first embodiment is that therefore second embodiment can't realize the binding of time slot and HARQ process id because the shortest HARQ_RTT is all adopted in each HARQ transmission.So HARQProcess id can't need explicit signaling to indicate through the latent expression of showing of timing relationship.
Need to prove that above-mentioned two embodiment manyly also are suitable for during to transfer point for comprising among the Frame.The present invention does not simultaneously limit uplink or downlink transfer yet.
Visible by the foregoing description; Clash and can't carry out HARQ when retransmitting at the time slot of the HARQ process handling duration of being separated by; Nearest available time slot after the HARQ process handling duration of being separated by is for retransmitting time slot; Like this, all adopt the shortest HARQ_RTT between adjacent twice transmission, to improve the transmission performance of HARQ.
Below introduce device embodiment of the present invention.
At first introduce the present invention first device embodiment, this device comprises that HARQ comes and goes duration unit 91 is set, and binds unit 92 and HARQ transmission unit 93, wherein,
HARQ comes and goes duration unit 91 is set, and is used for when the round duration of minimum HARQ is not equal to the integral multiple of a frame duration, HARQ is set comes and goes duration for come and go the doubly individual frame duration of smallest positive integral of duration greater than this minimum HARQ;
Bind unit 92, with the round duration of HARQ unit 91 is set and links to each other, be used for that the HARQ process is come and gone duration according to the HARQ that is provided with and be bundled in time slot;
HARQ transmission unit 93 links to each other with binding unit 92, is used on the time slot of binding, carrying out the HARQ transmission.
When minimum HARQ came and went duration and equals the integral multiple of a frame duration, HARQ came and went duration and unit 91 is set HARQ also is set comes and goes duration and come and go duration for this minimum HARQ.
For a time slot in the frame the process number that will bind, said binding unit 92 comes and goes the duration delivery through the sequence number with the frame at this time slot place according to HARQ, is provided with according to the gained remainder.
Introduce the present invention second device embodiment below, this device comprises conflict judging unit 101, retransmits time slot table unit 102, HARQ transmission unit 103, wherein,
Retransmit time slot table unit 102; Be used for setting re-transmission time slot table; Judge that at conflict judging unit 101 time slot of the HARQ process handling duration of being separated by clashes and can't carry out HARQ when retransmitting, what retransmit time slot in this table is the nearest available time slot after the HARQ process handling duration of being separated by;
Retransmit time slot table unit 102 and also be used for when conflict judging unit 101 judges that HARQ process handling duration equals the integral multiple of a frame duration, the time slot of setting the HARQ process handling duration of being separated by retransmits the re-transmission time slot in the time slot table.
Judge with the uplink time slot at conflict judging unit 101 and to be separated by the time slot of HARQ process handling duration when being not ascending time slot, retransmit time slot table unit 102 and set nearest ascending time slot after the HARQ process handling duration of being separated by for retransmitting the re-transmission time slot in the time slot table.
Judge with the downlink transfer time slot at conflict judging unit 101 and to be separated by the time slot of HARQ process handling duration when being not descending time slot, retransmit time slot table unit 102 and set nearest descending time slot after the HARQ process handling duration of being separated by for retransmitting the re-transmission time slot in the time slot table.
Visible by above embodiment provided by the invention: (1), when minimum HARQ comes and goes duration and is not equal to the integral multiple of a frame duration, HARQ is set comes and goes duration for the smallest positive integral that comes and goes duration greater than this a minimum HARQ frame duration doubly, the HARQ process is come and gone duration according to the HARQ that is provided be bundled on the time slot; Carry out HARQ transmission, like this, its round duration is set according to the handling duration of HARQ process; Can shorten HARQ two-way time; Thereby improve the HARQ transmission performance, and, the HARQ process is come and gone duration according to the HARQ that is provided be bundled on the time slot; Carry out the HARQ transmission, each time slot of each frame can reasonably be bound the HARQ process.(2), clash and can't carry out HARQ when retransmitting at the time slot of the HARQ process handling duration of being separated by; Nearest available time slot after the HARQ process handling duration of being separated by is for retransmitting time slot; Like this, all adopt the shortest HARQ_RTT between adjacent twice transmission, to improve the transmission performance of HARQ.
Though described the present invention through embodiment, those of ordinary skills know, the present invention has many distortion and variation and do not break away from spirit of the present invention, hope that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (6)
1. synchronous hybrid automatic repeat request method in the tdd systems is characterized in that, comprising:
When the round duration of the minimum of a certain time slot HARQ process is not equal to the integral multiple of a frame duration, this time slot HARQ is set comes and goes duration comes and goes duration for the minimum greater than this HARQ process the doubly individual frame duration of smallest positive integral;
The HARQ process is come and gone duration according to the HARQ that is provided be bundled on the time slot, carry out the HARQ transmission.
2. the method for claim 1 is characterized in that, said the HARQ process is come and gone before duration is bundled on the time slot according to the HARQ that is provided with, and this method also comprises:
When the round duration of the minimum of a certain time slot HARQ process equals the integral multiple of a frame duration, HARQ is set comes and goes the round duration of minimum that duration is this HARQ process.
3. the method for claim 1 is characterized in that, the said HARQ process is bundled on the time slot according to the round duration of the HARQ that is provided with realized by following mode:
For a time slot in the frame the process number that will bind, through the sequence number of the frame at this time slot place is come and gone the number delivery of frame length that duration comprises according to HARQ, according to the sequence number setting of gained remainder and this time slot.
4. synchronous hybrid automatic repeat request device in the tdd systems is characterized in that, comprises that HARQ comes and goes duration unit (91) is set, and binds unit (92) and HARQ transmission unit (93), wherein,
HARQ comes and goes duration unit (91) is set; Be used for when the round duration of the minimum of a certain time slot HARQ process is not equal to the integral multiple of a frame duration, this time slot HARQ be set come and go duration comes and goes duration for the minimum greater than this HARQ process the doubly individual frame duration of smallest positive integral;
Bind unit (92), with the round duration of HARQ unit (91) is set and links to each other, be used for that the HARQ process is come and gone duration according to the HARQ that is provided with and be bundled in time slot;
HARQ transmission unit (93) links to each other with binding unit (92), is used on the time slot of binding, carrying out the HARQ transmission.
5. device as claimed in claim 4; It is characterized in that; When the minimum of a certain time slot HARQ process came and went duration and equals the integral multiple of a frame duration, HARQ came and went duration and unit (91) is set HARQ also is set comes and goes duration and come and go duration for the minimum of this HARQ process.
6. device as claimed in claim 4; It is characterized in that; For a time slot in the frame the process number that will bind, said binding unit (92) comes and goes the duration delivery through the sequence number with the frame at this time slot place according to HARQ, according to gained remainder and the setting of time slot sequence number.
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| EP2306665A1 (en) | 2009-10-02 | 2011-04-06 | Panasonic Corporation | Relay backhaul uplink HARQ protocol |
| WO2012162970A1 (en) * | 2011-09-01 | 2012-12-06 | 华为技术有限公司 | Method, device and communication system for handling signal collision |
| CN103391554B (en) * | 2012-05-11 | 2016-05-25 | 中国移动通信集团公司 | A kind of multi-slot binding transmission method and device |
| CN103684713A (en) * | 2012-09-26 | 2014-03-26 | 中国移动通信集团公司 | Uplink and downlink data channel repeat method and system under carrier aggregation scene |
| US10772092B2 (en) | 2013-12-23 | 2020-09-08 | Qualcomm Incorporated | Mixed numerology OFDM design |
| KR20170095354A (en) * | 2014-12-18 | 2017-08-22 | 후아웨이 테크놀러지 컴퍼니 리미티드 | Wireless data transmission method, network side device, user equipment, and system |
| CN107294679B (en) * | 2016-03-31 | 2020-04-28 | 展讯通信（上海）有限公司 | Feedback method and device for downlink transmission of downlink short TTI (transmission time interval) |
| CN109829016B (en) * | 2019-01-25 | 2021-06-01 | 网宿科技股份有限公司 | Data synchronization method and device |
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