CN101369878A - 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 (the 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, HARQ can 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 by 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 determine 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 of each TTI correspondence (below be designated as HARQ process id) is for obtaining the HARQ_RTT delivery by TTI numbering (below be designated as TTI Number), 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, position among DUSP and UDSP such as the figure.
In the TDD system, as previously described, the length of TTI is a time slot, if method definition synchronous HARQ according to FDD, determine HARQ_RTT earlier, by TTI Number the method for HARQ_RTT delivery is determined HARQ process id again, may be owing to the conversion of uplink and downlink timeslot, cause process unavailable, retransmit thereby postpone.This conflict as shown in Figure 3, wherein, HARQ_RTT=3TTI, each Frame comprise and are numbered 5 time slots of 0 to 4, wherein preceding two is ascending time slot, 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 transmit on ensuing HARQ process id is 0 time slot, 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 difference.
Because in the TDD system, HARQ_RTT not only is subjected to the influence of device processes time delay, also be subjected to the influence of the position 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, its device processes duration may 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 distinguished 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 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 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.
Described 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 described 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 process number that time slot will be bound in the frame, by 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;
Carrying out HARQ on the re-transmission time slot of setting 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.
Described 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.
Described 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, binding 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 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;
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 process number that time slot will be bound in the frame, described binding unit 92 comes and goes the duration delivery by the sequence number with the frame at this time slot place according to HARQ, is provided with according to gained remainder and 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, retransmit time slot in this table and be the nearest available time slot after the HARQ process handling duration of being separated by;
Described re-transmission time slot table unit 102 also is used for when conflict judging unit 101 judges that HARQ process handling durations equal 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.
By above technical scheme provided by the invention as seen, 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 with to 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 schematic diagram 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 schematic diagram 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 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, similarly, 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 nearest descending time slot send the situation of 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 followingly represent 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 that 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 front ascending HARQ transmission of UE when the time slot 1 (HARQ process 1) of Frame N occurs; Because the processing delay Tenb that eNB receives behind the upstream data need to take 3ms; The downstream feedback of eNB will can be carried out at the time slot 0 of Frame N+1 the earliest; Afterwards because the processing delay Tue that UE receives after eNB feeds back need to take 3ms; But this moment, the 0th time slot of Frame N+2 was descending time slot; Can not carry out uplink; Therefore; The uplink of a rear UE 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, 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 determines that uplink and downlink timeslot is determined, 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.
Similarly, 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, 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.
Similarly, 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, 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, with time slot and the binding of HARQ process, so similar with prior art, therefore HARQ process id can not need explicit signaling consumption by the expression of timing relationship implicit expression.
Concrete, as will to bind for a certain time slot in a certain frame process number can be with the sequence number of the frame at this time slot place number delivery according to the round frame length that duration comprises of HARQ, according to different being provided with of remainder with place 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, and determine that by Frame and time slot HARQ Process id's is regular as follows this moment:
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.
As seen from the above-described embodiment, 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;
Carrying out HARQ on the re-transmission time slot of setting 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 followingly represent 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 determines that uplink and downlink timeslot is determined, and generally can't be changed thereupon.Therefore, when HARQ process handling duration equaled the integral multiple of a frame duration, the HARQ that carries out on the time slot of HARQ process handling duration of being separated by 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 situations:
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:
| HARQ process id | Initial transmission | Retransmit for the 1st time | Retransmit for the 2nd time | Retransmit for the |
| 1 | Frame |
Frame N+2 |
Frame N+4 |
Frame N+6 |
| 2 | Frame |
Frame N+3 |
Frame N+5 |
Frame N+7 |
| 3 | Frame |
Frame N+3 |
Frame N+5 |
Frame N+7 |
| 4 | Frame?N | Frame?N+3 | Frame?N+5 | Frame?N+7 |
| |
|
|
|
The mapping table of table 2.HARQ process and frame and time slot
As seen, 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 by 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.
As seen from the above-described embodiment, 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, binding 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;
Binding unit 92 is provided with unit 91 with the round duration of HARQ and links to each other, and is used for that the HARQ process is come and gone duration according to the HARQ that is provided with and is bundled in time slot;
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 process number that time slot will be bound in the frame, described binding unit 92 comes and goes the duration delivery by 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 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 durations equal 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.
By above embodiment provided by the invention as seen: (1), 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 with to 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 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 by 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, wish that appended claim comprises these distortion and variation and do not break away from spirit of the present invention.
Claims (14)
1. synchronous hybrid automatic repeat request method in the tdd systems is characterized in that, comprising:
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.
2. the method for claim 1 is characterized in that, described 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 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.
3. the method for claim 1 is characterized in that, the described 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 process number that time slot will be bound in the frame, by 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 method in the tdd systems is characterized in that, comprising:
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;
Carrying out HARQ on the re-transmission time slot of setting retransmits.
5. method as claimed in claim 4 is characterized in that, 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.
6. method as claimed in claim 4 is characterized in that, described setting retransmits time slot and 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.
7. method as claimed in claim 4 is characterized in that, described setting retransmits time slot and 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.
8. 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, binding 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 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;
Binding unit (92) comes and goes duration with HARQ and unit (91) is set links to each other, is used for the HARQ process is bundled in time slot when round according to the HARQ that is provided with;
HARQ transmission unit (93) links to each other with binding unit (92), is used for carrying out on the time slot of binding the HARQ transmission.
9. device as claimed in claim 8 is characterized in that, 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.
10. device as claimed in claim 8, it is characterized in that, for a process number that time slot will be bound in the frame, described binding unit (92) comes and goes the duration delivery by the sequence number with the frame at this time slot place according to HARQ, is provided with according to gained remainder and time slot sequence number.
11. synchronous hybrid automatic repeat request device in the tdd systems is characterized in that, comprises conflict judging unit (101), retransmits time slot table unit (102), HARQ transmission unit (103), wherein,
Conflict judging unit (101) is used to judge whether the time slot at the HARQ process handling duration of being separated by clashes;
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, retransmit time slot in this table and be the nearest available time slot after the HARQ process handling duration of being separated by;
HARQ transmission unit (103) carries out HARQ and retransmits on the re-transmission time slot in the re-transmission time slot table of setting.
12. device as claimed in claim 11, it is characterized in that, described 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.
13. device as claimed in claim 11, it is characterized in that, 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.
14. device as claimed in claim 11, it is characterized in that, 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.
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