CN101567773B - Method, system and device for sending data in time division duplex system - Google Patents
Method, system and device for sending data in time division duplex system Download PDFInfo
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Abstract
The invention relates to a wireless communication technique, in particular to a method, a system and a device for sending data in a time division duplex system for solving the problem of system deterioration in the prior art caused by serious time delay of feedback information and retransmission data in a bundling mechanism of a TDD system. The method of the embodiment of the invention comprises the following steps that: a network side processes received data from a terminal side and determines feedback information according to the processing result; and the network side puts the feedback information in a first special sub-frame or a first downlink sub-frame after the processing, and sends the feedback information to the terminal side. By adopting the method of the embodiment, the time delay of the feedback information and the retransmission data can be reduced.
Description
Technical field
The present invention relates to wireless communication technology, send the method, system and device of data in particularly a kind of tdd systems.
Background technology
At LTE (Long Term Evolution; Long Term Evolution) in the system; For the data block to error of transmission is fed back re-transmission fast; And merge through data block and to make full use of the information that misdata is carried, adopted HARQ (Hybrid Automatic Repeat reQuest mixes automatic repeat requests) technology.Concrete, adopted that multidiameter delay stops and waited the HARQ agreement, to support continuous scheduling and transmission data.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 adopts the multidiameter delay stop-and-wait protocol, starts a plurality of HARQ processes simultaneously, can remedy the low shortcoming of efficiency of transmission.Its basic thought is to dispose simultaneously a plurality of HARQ processes, in the feedback information process of certain HARQ process of wait, can continue to use other idle process transmits data packets.In the LTE system, under non-MIMO (multiple-input, multiple-output) mode of operation, each TTI (TransmissionTime Interval, Transmission Time Interval) only allows data block of transmission, and this data block takies a HARQ process.
For the data block of loading error occurring, must use identical HARQ process to retransmit, so that data receiver merges the data block of makeing mistakes.Wherein, the HARQ process is divided into two kinds of synchronous HARQ process and asynchronous HARQ processes.Wherein, in the asynchronous HARQ process, the retransmission time of data block is not predefined, but is dynamically determined by scheduler, the HARQ process numbering (ID) that therefore needs extra notice receiving terminal data block to use.
And in the synchronous HARQ process, retransmission time is predefined, with transmission first the time be carved with fixing sequential relationship, therefore its HARQ process ID can not need extra signaling consumption through the latent expression of showing of timing relationship.The time interval between adjacent twice transmission of same data block is called HARQRTT (walk time).
Shown in Figure 1A, in the FDD of LTE (Frequency division duplex, FDD) system, adopted synchronous HARQ mechanism, the provisional capital is transmission continuously up and down, and supports 8 HARQ processes.
Wherein, process is numbered 0-7, if after certain process transmission data is made mistakes, must retransmit in the process moment corresponding of follow-up identical numbering.For example user terminal carries out the initial transmission of data in process 0; The base station receives this data block and decodes; And user terminal is fed back in the moment at process 4 place according to decoded results, if decoding is correctly then feedback acknowledgment information A CK, otherwise feedback NACK messages NACK.If user terminal is received nack message, then the 0 pair of data block of process in the adjacent next HARQ RTT cycle retransmits, and the repetition said process is operated in the back, is perhaps reached the maximum transmission times of permission by correct reception up to data block.
In order to solve Cell Edge User owing to transmit power limited causes the serious problem that descends of quality of uplink signal; Introduced the notion of TTI bundling (TTI binding) in the FDD system; A plurality of continuous sub-frame of uplink or TTI are bound together HARQ process transmission of use; The identical data block of TTI transmission of a plurality of bindings, thus transmission performance improved, shown in Figure 1B:
User terminal is tied to 3 continuous sub-frame of uplink together and transmits through HARQ process numbering 0; Network side sends feedback information in HARQ process numbering 6; If feedback information is NACK; Then user terminal after two HARQ RTT, retransmits data retransmission through HARQ process numbering 0.
In TDD (Time division duplex, time division duplex) system, because the up-downgoing transmission alternately occurs, the transmission of up direction is not continuous usually, shown in Fig. 1 C,
In the tdd frame structure, the radio frames of a 10ms is divided into the field of two 5ms, and each field comprises 5 sub-frame, and such radio frames comprises the subframe of 10 1ms altogether.The radio frames that the field of one of them 5ms comprises a special subframe and 4 conventional subframes or a 10ms comprises a special subframe and 9 conventional subframes.
Shown in Fig. 1 D, in the ascending HARQ of TDD, according to different ascending-descending subframes ratios, the HARQ process number of support and HARQ RTT be difference to some extent also.
At present; In the TDD system; Only considered that non-bundling mechanism carries out the situation of feedback information and data retransmission (it is similar that non-bundling mechanism is carried out the situation and the FDD of feedback information and data retransmission); Processing for bundling mechanism is identical with non-bundling mechanism, and shown in Fig. 1 E, base station side is tied to 3 continuous TTI together and sends.
Wherein, Because 3 continuous TTI are bound together; The schedule information number that network side sends to end side is 3, and must send at P1, P2 and P3 place according to the sequential relationship of strictness, because in the bundling mechanism; For the TTI that binds together, (corresponding scheduling information is sent at the P3 place) that feedback information just generates to last TTI that binds.
For the ease of the processing of end side, feedback information is sent in a sub-frame with corresponding schedule information at present, promptly network side sends feedback information at the P3 place.
After user terminal was received feedback information, if feedback information is NACK, then user terminal had little time data retransmission in continuous three sub-frame of uplink of the next one, thus can only be in second continuous three sub-frame of uplink data retransmission.
But,, can increase the time delay of feedback information and data retransmission if under the bundling of TDD system mechanism, adopt the method for FDD to send feedback information and data retransmission because in the TDD system, the up-downgoing transmission alternately occurs.
In sum, in the bundling of TDD system mechanism, the time delay of feedback information and data retransmission is very serious, causes the deterioration of system, has reduced the utilization ratio of system.
Summary of the invention
The embodiment of the invention provides the method, system and device that send data in a kind of tdd systems; In order to solve exist in the prior art in the bundling of TDD system mechanism; The time delay of feedback information and data retransmission is very serious, causes the problem of system deterioration.
A kind of method of in tdd systems, sending feedback information that the embodiment of the invention provides comprises:
Network side is handled the data of receiving from end side, confirms feedback information according to result;
Said network side places first special subframe or first descending sub frame after processing finishes with said feedback information, sends to said end side.
The embodiment of the invention provides a kind of in tdd systems the method for end side data retransmission comprise:
End side from receive from extracting feedback information the special subframe of network side or the descending sub frame, said feedback information is handled, confirm the content of said feedback information;
Said end side confirms that said feedback information is NACK messages NACK, and first after processing is finished and the sub-frame of uplink identical with the corresponding process numbering of the sub-frame of uplink in the first initial moment of biography are as the initial moment of re-transmission, to said network side data retransmission.
A kind of method of in tdd systems, transmitting data that the embodiment of the invention provides comprises:
Network side is handled the data of receiving from end side, confirms feedback information according to result, and said feedback information is placed first special subframe or first descending sub frame after processing finishes, sends to said end side;
Said end side extracts said feedback information from said special subframe or descending sub frame; Said feedback information is handled; The content of confirming said feedback information is NACK messages NACK; After processing finished first and the process numbering identical sub-frame of uplink corresponding with the sub-frame of uplink in the first initial moment of biography are as the initial moment of re-transmission, to said network side data retransmission.
A kind of tdd communication systems that the embodiment of the invention provides comprises:
The base station is used for the data of receiving from user terminal are handled, and confirms feedback information according to result, and said feedback information is placed first special subframe or first descending sub frame after processing finishes, sends to said user terminal;
User terminal; Be used for extracting said feedback information from said special subframe or descending sub frame; Said feedback information is handled, and the content of confirming said feedback information is NACK messages NACK, first after processing is finished and the process numbering identical sub-frame of uplink corresponding with the sub-frame of uplink in the first initial moment of biography; As retransmitting the initial moment, to said base station data retransmission.
A kind of base station that the embodiment of the invention provides comprises:
Data processing module is used for the data of receiving from user terminal are handled, and confirms feedback information according to result;
The feedback information sending module is used for said feedback information is placed first special subframe or first descending sub frame after said data processing module processing finishes, sends to said user terminal.
A kind of user terminal that the embodiment of the invention provides comprises:
Extraction module is used for extracting feedback information from special subframe or the descending sub frame from the base station received;
Feedback information processing module in the processing module is used for the said feedback information that extracts is handled, and confirms the content of said feedback information;
Sending module in the processing module; Being used for said feedback information is NACK messages NACK; After said feedback information processing module processing finished first and number identical sub-frame of uplink with the corresponding process of the sub-frame of uplink in the first initial moment of biography; As retransmitting the initial moment, to said base station data retransmission.
The another kind that the embodiment of the invention provides sends feedback information in tdd systems method comprises:
Network side is handled the data of receiving from end side, confirms feedback information according to result;
Said network side is confirmed a special time slot or descending sub frame according to the time of the deal with data finish time and said end side processing feedback information, and said feedback information is placed definite special subframe or descending sub frame, sends to said end side.
The another kind that the embodiment of the invention provides transmits data in tdd systems method comprises:
Network side is handled the data of receiving from end side; Confirm feedback information according to result; According to the time of the deal with data finish time and said end side processing feedback information; Confirm a special time slot or descending sub frame, said feedback information is placed definite special subframe or descending sub frame, send to said end side;
Said end side extracts said feedback information from said special subframe or descending sub frame; Said feedback information is handled; The content of confirming said feedback information is NACK messages NACK; After processing finished first and the process numbering identical sub-frame of uplink corresponding with the sub-frame of uplink in the first initial moment of biography are as the initial moment of re-transmission, to said network side data retransmission.
The another kind of tdd communication systems that the embodiment of the invention provides comprises:
The base station; Be used for the data of receiving from user terminal are handled; Confirm feedback information according to result,, confirm a special time slot or descending sub frame according to the time of the deal with data finish time and said user terminal processes feedback information; Said feedback information is placed definite special subframe or descending sub frame, send to said user terminal;
User terminal; Be used for extracting said feedback information from said special subframe or descending sub frame; Said feedback information is handled, and the content of confirming said feedback information is NACK messages NACK, first after processing is finished and the process numbering identical sub-frame of uplink corresponding with the sub-frame of uplink in the first initial moment of biography; As retransmitting the initial moment, to said base station data retransmission.
The another kind of base station that the embodiment of the invention provides comprises:
First module is used for the data of receiving from user terminal are handled, and confirms feedback information according to result;
Second module is used for confirming a special time slot or descending sub frame according to the time of handling the finish time and said user terminal processes feedback information;
Three module is because special subframe or descending sub frame that the said feedback information that said first module is confirmed places said second module to confirm send to said user terminal.
Embodiment of the invention network side is handled the data of receiving from end side, confirms feedback information according to result; Said network side places first special subframe or first descending sub frame after processing finishes with said feedback information; Send to said end side; Thereby reduced the time delay of feedback information and data retransmission, improved the performance of system, improved the utilization ratio of system.
Description of drawings
Figure 1A is a synchronous HARQ schematic diagram of mechanism in the FDD system;
Figure 1B is the TTI bundling schematic diagram of mechanism of synchronous HARQ in the FDD system;
Fig. 1 C is a TDD system frame structure sketch map;
Fig. 1 D is a TDD system ascending-descending subframes ratio sketch map;
Fig. 1 E is the TTI bundling schematic diagram of mechanism of synchronous HARQ in the TDD system;
Fig. 2 is first kind of tdd communication systems structural representation of the embodiment of the invention;
Fig. 3 is first kind of architecture of base station sketch map of the embodiment of the invention;
Fig. 4 is an embodiment of the invention user terminal structural representation;
Fig. 5 A is the embodiment of the invention is sent feedback information in tdd systems a method flow sketch map;
Fig. 5 B is the method flow sketch map of embodiment of the invention end side data retransmission in tdd systems;
Fig. 5 C is the embodiment of the invention is transmitted data in tdd systems a method flow sketch map;
Fig. 6 is a synchronous HARQ TTI bundling schematic diagram of mechanism in first kind of TDD system of the embodiment of the invention;
Fig. 7 is an embodiment of the invention data retransmission method flow sketch map;
Fig. 8 A is second kind of tdd communication systems structural representation of the embodiment of the invention;
Second kind of architecture of base station sketch map of Fig. 8 B embodiment of the invention;
Fig. 8 C is second kind of method flow sketch map that in tdd systems, sends feedback information of the embodiment of the invention;
Fig. 8 D is the method flow sketch map of second kind of transmission data in tdd systems of the embodiment of the invention;
Synchronous HARQ TTI bundling schematic diagram of mechanism in second kind of TDD system of Fig. 8 E embodiment of the invention.
Embodiment
Embodiment of the invention network side is handled data; Handle the time of feedback information according to handling the finish time and end side; Confirm a special time slot or descending sub frame; Place definite special subframe or descending sub frame to send feedback information, perhaps place first special subframe or first descending sub frame after processing finishes to send said feedback information; End side is handled feedback information; When process information is NACK; After processing finished first and number identical sub-frame of uplink with the corresponding process of the sub-frame of uplink in the first initial moment of biography; As retransmitting the initial moment,, thereby reduced the time delay of feedback information and data retransmission to the network side data retransmission.
Wherein, feedback information is placed the descending pilot frequency time slot (DwPTS) of special subframe.
As shown in Figure 2, first kind of tdd communication systems of inventive embodiments comprises: base station 10 and user terminal 20.
Base station 10 is used for the data of receiving from user terminal 20 are handled, and confirms feedback information according to result, and this feedback information is placed first special subframe or first descending sub frame after processing finishes, sends to user terminal 20.
User terminal 20 is used for the feedback information of receiving from base station 10 is handled.
Concrete; User terminal 20 extracts feedback information from special subframe or descending sub frame; Feedback information is handled, and the content of confirming feedback information is NACK messages NACK, first after processing is finished and the process numbering identical sub-frame of uplink corresponding with the sub-frame of uplink in the first initial moment of biography; As retransmitting the initial moment, to base station 10 data retransmissions.
In the practical implementation process, high-level signaling informing user terminal 20 can be passed through in base station 10 after confirming through which special subframe or descending sub frame transmission feedback information; Perhaps in user terminal 20, define base station 10 in advance and select the standard of special subframe or descending sub frame, user terminal 20 can accurately find special subframe or the descending sub frame that carries feedback information according to the standard of correspondence.
As shown in Figure 3, first kind of base station of the embodiment of the invention comprises: data processing module 100 and feedback information sending module 110.
Data processing module 100 is used for the data of receiving from user terminal are handled, and confirms feedback information according to result.
Wherein, 100 pairs of data processing modules receive that data decode, if decode successfully, confirm that then feedback information is ACK; Otherwise, confirm that feedback information is NACK.
Feedback information sending module 110 is used for this feedback information, places first special subframe or first descending sub frame after data processing module 100 processing finish, sends to user terminal.
Need to prove; The time of data processing module 100 deal with data is to confirm according in advance setting or concrete needs; Such as; Data processing module 100 needs the time of 3 sub-frame (being 3ms), accomplishes data decode, and then first special subframe or the descending sub frame of feedback information sending module 110 after 3 sub-frame sends feedback information.
As shown in Figure 4, embodiment of the invention user terminal comprises: extraction module 200 and processing module 210.
Extraction module 200 is used for extracting feedback information from special subframe or the descending sub frame from the base station received.
Wherein, extraction module 200 confirms to carry the special subframe or the descending sub frame of feedback information according in advance setting or from the high-level signaling of base station.
Processing module 210 is used for the feedback information that extraction module 200 extracts is handled.
Wherein, processing module 210 can further include: feedback information processing module 2100 and sending module 2110.
Feedback information processing module 2100 is used for the feedback information that extracts is handled, and confirms the content of feedback information.
Sending module 2110; Be used for when this feedback information is NACK; After 2100 processing of feedback information processing module are finished first and the process numbering identical sub-frame of uplink corresponding with the sub-frame of uplink in the first initial moment of biography are as the initial moment of re-transmission, to the base station data retransmission.
Concrete; If feedback information is NACK; Sending module 2110 is confirmed the time that 2100 pairs of feedback information processing of feedback information processing module finish; Search the corresponding identical sub-frame of uplink of process numbering of sub-frame of uplink in this time in the initial moment afterwards and the initial transmission data then, and with the initial moment of satisfactory first sub-frame of uplink as re-transmission, to the base station data retransmission.
Such as: data retransmission need take 4 sub-frame, then passes through 3 sub-frame of uplink of satisfactory first sub-frame of uplink and its back, to the base station data retransmission.
Need to prove; The time of feedback information processing module 2100 deal with data is to confirm according in advance setting or concrete needs; Such as; Feedback information processing module 2100 needs the time of 3 sub-frame (being 3ms), accomplishes data decode, and then feedback information processing module 2100 satisfactory first sub-frame of uplink after 3 sub-frame is as the initial moment that retransmits.
Shown in Fig. 5 A, first kind of method of in tdd systems, sending feedback information of the embodiment of the invention comprises the following steps:
Step a500, network side are handled the data of receiving from end side, confirm feedback information according to result.
Step a501, network side place first special subframe or first descending sub frame after processing finishes with the feedback information of confirming, send to end side.
Need to prove; The time of network side deal with data is to confirm according in advance setting or concrete needs, such as, the time of needs 3 sub-frame (being 3ms); Accomplish data decode, then first special subframe after 3 sub-frame or descending sub frame send feedback information.
Shown in Fig. 5 B, the method for embodiment of the invention end side data retransmission in tdd systems comprises the following steps:
Step b500, end side from receive from extracting feedback information the special subframe of network side or the descending sub frame, this feedback information is handled, confirm the content of feedback information.
When step b501, end side were NACK at definite feedback information, first after processing finished and the sub-frame of uplink identical with the corresponding process numbering of the sub-frame of uplink in the first initial moment of biography were as the initial moment of re-transmission, to the network side data retransmission.
Wherein, end side is according in advance setting or from the high-level signaling of network side, confirms to carry the special subframe or the descending sub frame of feedback information.
Concrete; After end side is confirmed the time of feedback information processing end; Search the corresponding identical sub-frame of uplink of process numbering of this time sub-frame of uplink afterwards and the initial moment initial transmission data; And with the initial moment of satisfactory first sub-frame of uplink, to the network side data retransmission as re-transmission.
Such as: data retransmission need take 4 sub-frame, then passes through 3 sub-frame of uplink of satisfactory first sub-frame of uplink and its back, to the network side data retransmission.
Need to prove that end side need be according to network condition and the ability of self, the time of decision deal with data; Such as; The time that needs 3 sub-frame (being 3ms), accomplish data decode, then satisfactory first sub-frame of uplink after 3 sub-frame is as the initial moment that retransmits.
Shown in Fig. 5 C, the embodiment of the invention is transmitted data in tdd systems method comprises the following steps:
Step c500, network side are handled the data of receiving from end side, confirm feedback information according to result.
Step c501, network side place first special subframe or first descending sub frame after processing finishes with the feedback information of confirming, send to end side.
Step c502, end side from receive from extracting feedback information the special subframe of network side or the descending sub frame, this feedback information is handled, confirm the content of feedback information.
When step c503, end side were NACK at definite feedback information, first after processing finished and the sub-frame of uplink identical with the corresponding process numbering of the sub-frame of uplink in the first initial moment of biography were as the initial moment of re-transmission, to the network side data retransmission.
In the practical implementation process, network side can be through high-level signaling notice end side after confirming through which special subframe or descending sub frame transmission feedback information; Perhaps in end side in advance the define grid side select the standard of special subframe or descending sub frame, end side can accurately find special subframe or the descending sub frame that carries feedback information according to the standard of correspondence.
As shown in Figure 6; In the synchronous HARQ TTI bundling schematic diagram of mechanism, suppose that the radio frames of a 10ms comprises a special subframe and 9 conventional subframes, in the embodiment of the invention TDD system comprising 6 descending time slots and 3 ascending time slots; The time of user terminal processes feedback information is 3 sub-frame; The time of base station processes data is 3 sub-frame, three TTI is bound (promptly transmit data and need take three sub-frame), then adopts the method for the embodiment of the invention:
The corresponding process of user terminal initial transmission subframe constantly is numbered 1, and two sub-frame of uplink that take are thereafter sent out data;
Decoding to data after receiving the data that just pass in the base station, needs the time of 3 sub-frame, and first descending sub frame (being the P1 place) after the base station can be finished through deal with data sends feedback information NACK, the hypothesis decoding failure;
User terminal is after receiving feedback information; Feedback information is handled; The time that needs 3 sub-frame, after definite feedback information was NACK, the process that can search after processing finishes was numbered 1 subframe; And first sub-frame of uplink that will satisfy condition is as the initial moment (being the P2 place) of data retransmission, and takies two sub-frame of uplink data retransmissions thereafter.
Fig. 1 E is compared, and the each re-transmission of the method for the embodiment of the invention can both be shortened the time of a radio frames, thereby has reduced the time delay of feedback information and data retransmission.
As shown in Figure 7.Embodiment of the invention data retransmission method comprises the following steps:
The time of supposing the user terminal processes feedback information is 3 sub-frame, and the time of base station processes data is 3 sub-frame, is employed in mode informing user terminal pre-configured in the standard (this mode can reduce overhead than the high-level signaling notice).
Dispatch the terminal according to dispatching algorithm step 700, base station, distributes ascending resource, when adopting bundling mechanism, together with the time distribute a plurality of sub-frame of uplink resource.
After step 702, base station receive data, data are handled, confirmed feedback information according to result.
When step 705, user terminal were NACK at feedback information, first after processing finished and the process numbering identical sub-frame of uplink corresponding with the sub-frame of uplink in the first initial moment of biography were as the initial moment of re-transmission, to the base station data retransmission.
Follow-up repeating step 702～705, the number of times that successfully receives data or user terminal data retransmission up to the base station reaches the maximum of setting.
Shown in Fig. 8 A, second kind of tdd communication systems of the embodiment of the invention comprises: base station 30 and user terminal 40.
Base station 30; Be used for the data of receiving from user terminal 40 are handled; Confirm feedback information according to result,, confirm a special time slot or descending sub frame according to the time of the deal with data finish time and user terminal 40 processing feedback informations; Feedback information is placed definite special subframe or descending sub frame, send to user terminal 40;
User terminal 40 is used for the feedback information of receiving from base station 30 is handled.
Concrete; User terminal 40 extracts feedback information from special subframe or descending sub frame; Feedback information is handled, and the content of confirming said feedback information is NACK messages NACK, first after processing is finished and the process numbering identical sub-frame of uplink corresponding with the sub-frame of uplink in the first initial moment of biography; As retransmitting the initial moment, to base station 30 data retransmissions.
In the practical implementation process, high-level signaling informing user terminal 40 can be passed through in base station 30 after confirming through which special subframe or descending sub frame transmission feedback information; Perhaps in user terminal 40, define base station 30 in advance and select the standard of special subframe or descending sub frame, user terminal 40 can accurately find special subframe or the descending sub frame that carries feedback information according to the standard of correspondence.
Shown in Fig. 8 B, second kind of base station of the embodiment of the invention comprises: first module 70, second module 80 and the three module 90.
Second module 80 is used for the time according to the 70 deal with data finish times of first module and user terminal processes feedback information, confirms a special time slot or descending sub frame.
Wherein, second module 80 can further include: first determination module 81, second determination module 82 and select module 83.
First determination module 81 is used for the time according to the user terminal processes feedback information, confirms the initial moment of user terminal data retransmission.
Second determination module 82 is used for confirming the zero-time of user terminal processes feedback information according to the time of user terminal processes feedback information and the initial moment of user terminal data retransmission.
Three module 90 is used for the special subframe or the descending sub frame that place second module 80 to confirm the feedback informations that first module 70 is confirmed, sends to user terminal.
Shown in Fig. 8 C, second kind of method of in tdd systems, sending feedback information of the embodiment of the invention comprises the following steps:
Step a800, network side are handled the data of receiving from end side, confirm feedback information according to result.
The time that step a801, network side handle feedback information according to self and end side deal with data the finish time, confirm a special time slot or descending sub frame, feedback information is placed definite special subframe or descending sub frame, send to end side.
Concrete, network side is confirmed the initial moment of end side data retransmission according to the time of end side processing feedback information; Handle the time of feedback information and the initial moment of the end side data retransmission of confirming according to end side, confirm the initial moment of end side processing feedback information; Handle the initial moment of feedback information between from self and end side deal with data the finish time, select a special time slot or descending sub frame.
In the practical implementation process, the time that end side is handled feedback information can or preestablish acquisition according to the reporting information of end side.
Shown in Fig. 8 D, the method for second kind of transmission data in tdd systems of the embodiment of the invention comprises the following steps:
Step b800, network side are handled the data of receiving from end side, confirm feedback information according to result.
The time that step b801, network side handle feedback information according to self and end side deal with data the finish time, confirm a special time slot or descending sub frame, feedback information is placed definite special subframe or descending sub frame, send to end side.
Step b802, end side from receive from extracting feedback information the special subframe of network side or the descending sub frame, this feedback information is handled, confirm the content of feedback information.
When step b803, end side were NACK at definite feedback information, first after processing finished and the sub-frame of uplink identical with the corresponding process numbering of the sub-frame of uplink in the first initial moment of biography were as the initial moment of re-transmission, to the network side data retransmission.
In the practical implementation process, network side can be through high-level signaling notice end side after confirming through which special subframe or descending sub frame transmission feedback information; Perhaps in end side in advance the define grid side select the standard of special subframe or descending sub frame, end side can accurately find special subframe or the descending sub frame that carries feedback information according to the standard of correspondence.
Shown in Fig. 8 E; In the synchronous HARQ TTI bundling schematic diagram of mechanism, suppose that the radio frames of a 10ms comprises a special subframe and 9 conventional subframes, in second kind of TDD system of the embodiment of the invention comprising 7 descending time slots and two ascending time slots; The time of user terminal processes feedback information is 3 sub-frame; The time of base station processes data is 3 sub-frame, two TTI is bound (promptly transmit data and need take two sub-frame), then adopts the method for the embodiment of the invention:
The corresponding process of user terminal initial transmission subframe constantly is numbered 1, and 1 sub-frame of uplink that takies is thereafter sent out data;
The base station is after receiving the data that just pass; Data are decoded; The time (promptly managing end everywhere) of needs 3 sub-frame, and the time processing feedback information of definite user terminal needs 3 sub-frame at P1, thus the zero-time of confirming the user terminal data retransmission is the P3 place; And then the zero-time of definite user terminal processes feedback information is the P2 place, and then the base station is from selecting a special subframe or descending sub frame between P1～P2.
Then feedback information is carried from the descending sub frame of selecting P11 or P12 between P1～P2 in the base station.
Need to prove that the transmission data units in the foregoing description (being TTI) is a subframe, transmission data units can also be time slot (two time slots are a sub-frame) as required, and practical implementation method and subframe are similar, repeat no more.
From the foregoing description, can find out: embodiment of the invention network side is handled the data of receiving from end side, confirms feedback information according to result; Said network side places first special subframe or first descending sub frame after processing finishes with said feedback information; Send to said end side; Thereby reduced the time delay of feedback information and data retransmission, improved the performance of system, improved the utilization ratio of system.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technologies thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (16)
1. method of in tdd systems, sending feedback information is characterized in that this method comprises:
Network side is handled the data of receiving from end side, confirms feedback information according to result;
Said network side places first special subframe or first descending sub frame after processing finishes with said feedback information, sends to said end side.
2. the method for an end side data retransmission in tdd systems is characterized in that, this method comprises:
End side from receive from extracting feedback information the special subframe of network side or the descending sub frame, said feedback information is handled, confirm the content of said feedback information;
Said end side confirms that said feedback information is NACK messages NACK, and first after processing is finished and the sub-frame of uplink identical with the corresponding process numbering of the sub-frame of uplink in the first initial moment of biography are as the initial moment of re-transmission, to said network side data retransmission.
3. method as claimed in claim 2 is characterized in that, said end side is according in advance setting or from the high-level signaling of said network side, confirms to carry the special subframe or the descending sub frame of said feedback information.
One kind in tdd systems the transmission data method, it is characterized in that this method comprises:
Network side is handled the data of receiving from end side, confirms feedback information according to result, and said feedback information is placed first special subframe or first descending sub frame after processing finishes, sends to said end side;
Said end side extracts said feedback information from said special subframe or descending sub frame; Said feedback information is handled; The content of confirming said feedback information is NACK messages NACK; After processing finished first and the process numbering identical sub-frame of uplink corresponding with the sub-frame of uplink in the first initial moment of biography are as the initial moment of re-transmission, to said network side data retransmission.
5. method as claimed in claim 4 is characterized in that, said end side is according in advance setting or from the high-level signaling of said network side, confirms to carry the special subframe or the descending sub frame of said feedback information.
6. a tdd communication systems is characterized in that, this system comprises:
The base station is used for the data of receiving from user terminal are handled, and confirms feedback information according to result, and said feedback information is placed first special subframe or first descending sub frame after processing finishes, sends to said user terminal;
User terminal; Be used for extracting said feedback information from said special subframe or descending sub frame; Said feedback information is handled, and the content of confirming said feedback information is NACK messages NACK, first after processing is finished and the process numbering identical sub-frame of uplink corresponding with the sub-frame of uplink in the first initial moment of biography; As retransmitting the initial moment, to said base station data retransmission.
7. a base station is characterized in that, this base station comprises:
Data processing module is used for the data of receiving from user terminal are handled, and confirms feedback information according to result;
The feedback information sending module is used for said feedback information is placed first special subframe or first descending sub frame after said data processing module processing finishes, sends to said user terminal.
8. a user terminal is characterized in that, this user terminal comprises:
Extraction module is used for extracting feedback information from special subframe or the descending sub frame from the base station received;
Feedback information processing module in the processing module is used for the said feedback information that extracts is handled, and confirms the content of said feedback information;
Sending module in the processing module; Being used for said feedback information is NACK messages NACK; After said feedback information processing module processing finished first and number identical sub-frame of uplink with the corresponding process of the sub-frame of uplink in the first initial moment of biography; As retransmitting the initial moment, to said base station data retransmission.
9. method of in tdd systems, sending feedback information is characterized in that this method comprises:
Network side is handled the data of receiving from end side, confirms feedback information according to result;
Said network side is confirmed a special subframe or descending sub frame according to the time of the deal with data finish time and said end side processing feedback information, and said feedback information is placed definite special subframe or descending sub frame, sends to said end side.
10. method as claimed in claim 9 is characterized in that, said network side confirms that a special subframe or descending sub frame comprise:
According to the time that said end side is handled feedback information, confirm the initial moment of said end side data retransmission;
Handle the time of feedback information and the initial moment of said end side data retransmission according to said end side, confirm the initial moment of said end side processing feedback information;
Handle between the initial moment of feedback information from the said deal with data finish time and said end side, select a special subframe or descending sub frame.
11. the method for transmission data in tdd systems is characterized in that this method comprises:
Network side is handled the data of receiving from end side; Confirm feedback information according to result; According to the time of the deal with data finish time and said end side processing feedback information; Confirm a special subframe or descending sub frame, said feedback information is placed definite special subframe or descending sub frame, send to said end side;
Said end side extracts said feedback information from said special subframe or descending sub frame; Said feedback information is handled; The content of confirming said feedback information is NACK messages NACK; After processing finished first and the process numbering identical sub-frame of uplink corresponding with the sub-frame of uplink in the first initial moment of biography are as the initial moment of re-transmission, to said network side data retransmission.
12. method as claimed in claim 11 is characterized in that, said network side confirms that a special subframe or descending sub frame comprise:
According to the time that said end side is handled feedback information, confirm the initial moment of said end side data retransmission;
Handle the time of feedback information and the initial moment of said end side data retransmission according to said end side, confirm the initial moment of said end side processing feedback information;
Handle between the initial moment of feedback information from the said deal with data finish time and said end side, select a special subframe or descending sub frame.
13. method as claimed in claim 12 is characterized in that, said end side is according in advance setting or from the high-level signaling of said network side, confirms to carry the special subframe or the descending sub frame of said feedback information.
14. a tdd communication systems is characterized in that, this system comprises:
The base station; Be used for the data of receiving from user terminal are handled; Confirm feedback information according to result,, confirm a special subframe or descending sub frame according to the time of the deal with data finish time and said user terminal processes feedback information; Said feedback information is placed definite special subframe or descending sub frame, send to said user terminal;
User terminal; Be used for extracting said feedback information from said special subframe or descending sub frame; Said feedback information is handled, and the content of confirming said feedback information is NACK messages NACK, first after processing is finished and the process numbering identical sub-frame of uplink corresponding with the sub-frame of uplink in the first initial moment of biography; As retransmitting the initial moment, to said base station data retransmission.
15. a base station is characterized in that, this base station comprises:
First module is used for the data of receiving from user terminal are handled, and confirms feedback information according to result;
Second module is used for confirming a special subframe or descending sub frame according to the time of handling the finish time and said user terminal processes feedback information;
Three module is used for the said feedback information that said first module is confirmed is placed said second module definite special subframe or descending sub frame, sends to said user terminal.
16. base station as claimed in claim 15 is characterized in that, said second module comprises:
First determination module is used for the time according to said user terminal processes feedback information, confirms the initial moment of said user terminal data retransmission;
Second determination module is used for confirming the zero-time of said user terminal processes feedback information according to the time of said user terminal processes feedback information and the initial moment of said user terminal data retransmission;
Select module, be used for selecting a special subframe or descending sub frame between the initial moment of the said deal with data finish time and said user terminal processes feedback information.
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| CN102355334B (en) * | 2011-07-22 | 2017-06-09 | 中兴通讯股份有限公司 | The transmission method and user equipment of data under a kind of semi-persistent scheduling mode |
| CN103138903B (en) * | 2011-11-30 | 2016-01-20 | 上海贝尔股份有限公司 | A kind of for carrying out the method and apparatus that TD-LTE TTI bundling transmits |
| CN103384177B (en) * | 2012-05-02 | 2017-06-20 | 华为技术有限公司 | Data pack transmission method and system, user equipment and base station |
| CN109600850B (en) * | 2012-09-25 | 2023-04-07 | 日本电气株式会社 | Method and apparatus for enhancing coverage |
| US10342012B2 (en) | 2015-03-15 | 2019-07-02 | Qualcomm Incorporated | Self-contained time division duplex (TDD) subframe structure |
| US10075970B2 (en) * | 2015-03-15 | 2018-09-11 | Qualcomm Incorporated | Mission critical data support in self-contained time division duplex (TDD) subframe structure |
| US9936519B2 (en) | 2015-03-15 | 2018-04-03 | Qualcomm Incorporated | Self-contained time division duplex (TDD) subframe structure for wireless communications |
| US9992790B2 (en) | 2015-07-20 | 2018-06-05 | Qualcomm Incorporated | Time division duplex (TDD) subframe structure supporting single and multiple interlace modes |
| US11160072B2 (en) | 2016-03-31 | 2021-10-26 | Panasonic Intellectual Property Corporalion of America | Special subframe configuration for latency reduction |
| US10548118B2 (en) * | 2016-05-13 | 2020-01-28 | Qualcomm Incorporated | Multiple transmission time interval coordination with time division duplexing |
| CN105933100B (en) * | 2016-06-27 | 2019-09-17 | 珠海市魅族科技有限公司 | HARQ feedback method and device, base station and terminal |
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