CN101567773A - 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 the information that misdata is carried that makes full use of by data block, 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 by 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, Frequency Division Duplexing (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 places 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 back operation repeats said process, is correctly received or reach the maximum transmission times of permission 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, thereby improve transmission performance, shown in Figure 1B:
User terminal is tied to 3 continuous sub-frame of uplink together and transmits by 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 by 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 subframes, 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, 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, network side is 3 to the schedule information number that end side sends, 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 sends at the P3 place) that feedback information just generates at last TTI that binds.
At present for the ease of the processing of end side, feedback information is sent in a subframe with corresponding schedule information, promptly network side is at P3 place transmission feedback information.
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 that sends feedback information in tdd systems that the embodiment of the invention provides comprises:
Network side is handled the data of receiving from end side, determines feedback information according to result;
First special subframe or first descending sub frame after described network side places processing to finish described feedback information send to described 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, described feedback information is handled, determine the content of described feedback information;
Described end side determines that described 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 retransmitting the initial moment, to described network side data retransmission.
A kind of method of transmitting data in tdd systems that the embodiment of the invention provides comprises:
Network side is handled the data of receiving from end side, determines feedback information according to result, and first special subframe or first descending sub frame after placing processing to finish described feedback information send to described end side;
Described end side extracts described feedback information from described special subframe or descending sub frame, described feedback information is handled, the content of determining described 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, as retransmitting the initial moment, to described 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 determines feedback information according to result, and first special subframe or first descending sub frame after placing processing to finish described feedback information send to described user terminal;
User terminal, be used for extracting described feedback information from described special subframe or descending sub frame, described feedback information is handled, the content of determining described 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, as retransmitting the initial moment, to described 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 determines feedback information according to result;
The feedback information sending module is used for described feedback information is placed first special subframe or first descending sub frame after described data processing module processing finishes, sends to described 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;
Processing module is used for described feedback information is handled.
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, determines feedback information according to result;
Described network side is determined a special time slot or descending sub frame according to the time of the deal with data finish time and described end side processing feedback information, and described feedback information is placed definite special subframe or descending sub frame, sends to described 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, determine feedback information according to result, according to the time of the deal with data finish time and described end side processing feedback information, determine a special time slot or descending sub frame, described feedback information is placed definite special subframe or descending sub frame, send to described end side;
Described end side extracts described feedback information from described special subframe or descending sub frame, described feedback information is handled, the content of determining described 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, as retransmitting the initial moment, to described 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, determine feedback information according to result, according to the time of the deal with data finish time and described user terminal processes feedback information, determine a special time slot or descending sub frame, described feedback information is placed definite special subframe or descending sub frame, send to described user terminal;
User terminal, be used for extracting described feedback information from described special subframe or descending sub frame, described feedback information is handled, the content of determining described 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, as retransmitting the initial moment, to described 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 determines feedback information according to result;
Second module is used for determining a special time slot or descending sub frame according to the time of handling the finish time and described user terminal processes feedback information;
Three module is because special subframe or descending sub frame that the described feedback information that described first module is determined places described second module to determine send to described user terminal.
Embodiment of the invention network side is handled the data of receiving from end side, determines feedback information according to result; First special subframe or first descending sub frame after described network side places processing to finish described feedback information, send to described 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 schematic diagram;
Fig. 1 D is a TDD system ascending-descending subframes ratio schematic diagram;
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 schematic diagram 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 sends feedback information in tdd systems a method flow schematic diagram;
Fig. 5 B is the method flow schematic diagram 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 schematic diagram;
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 schematic diagram;
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 schematic diagram of Fig. 8 B embodiment of the invention;
Fig. 8 C is second kind of method flow schematic diagram that sends feedback information in tdd systems of the embodiment of the invention;
Fig. 8 D is the method flow schematic diagram 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, determine a special time slot or descending sub frame, place definite special subframe or descending sub frame to send feedback information, perhaps described feedback information is placed first special subframe or first descending sub frame after processing finishes to send; End side is handled feedback information, when process information is 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, as retransmitting the initial moment, to the network side data retransmission, thereby reduced the time delay of feedback information and 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 determines feedback information according to result, and first special subframe or first descending sub frame after placing processing to finish this feedback information send 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, the content of determining 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, as retransmitting the initial moment, to base station 10 data retransmissions.
In specific implementation process, high-level signaling informing user terminal 20 can be passed through in base station 10 after determining by which special subframe or descending sub frame transmission feedback information; Perhaps the standard of special subframes or descending sub frame is selected in pre-defined base station 10 in user terminal 20, and user terminal 20 can accurately find the special subframe or the descending sub frame of carrying 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 determines feedback information according to result.
Wherein, 100 pairs of data processing modules receive that data decode, if decode successfully, determine that then feedback information is ACK; Otherwise, determine 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 determine according in advance setting or concrete needs, such as, data processing module 100 needs the time of 3 subframes (being 3ms), finish data decode, then first special subframe or the descending sub frame of feedback information sending module 110 after 3 subframes sends feedback information.
As shown in Figure 4, embodiment of the invention user terminal comprises: extraction module 200 and processing module 210.
Wherein, extraction module 200 is determined the special subframe or the descending sub frame of carrying 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 determines 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 retransmitting the initial moment, to the base station data retransmission.
Concrete, if feedback information is NACK, sending module 2110 is determined 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 this time sub-frame of uplink afterwards and the initial moment initial transmission data then, and with the initial moment of satisfactory first sub-frame of uplink, to the base station data retransmission as re-transmission.
Such as: data retransmission need take 4 subframes, 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 determine according in advance setting or concrete needs, such as, feedback information processing module 2100 needs the time of 3 subframes (being 3ms), finish data decode, then feedback information processing module 2100 satisfactory first sub-frame of uplink after 3 subframes is as the initial moment that retransmits.
Shown in Fig. 5 A, first kind of method that sends feedback information in tdd systems of the embodiment of the invention comprises the following steps:
Step a500, network side are handled the data of receiving from end side, determine 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 determining, send to end side.
Need to prove, the time of network side deal with data is to determine according in advance setting or concrete needs, such as, the time of 3 subframes of needs (being 3ms), finish data decode, then first special subframe after 3 subframes 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, determine 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 retransmitting the initial moment, to the network side data retransmission.
Wherein, end side is according in advance setting or from the high-level signaling of network side, determines the special subframe or the descending sub frame of carrying feedback information.
Concrete, after end side is determined 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 subframes, 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, need the time of 3 subframes (being 3ms), finish data decode, then satisfactory first sub-frame of uplink after 3 subframes 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, determine 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 determining, 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, determine 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 retransmitting the initial moment, to the network side data retransmission.
In specific implementation process, network side can be notified end side by high-level signaling after determining by which special subframe or descending sub frame transmission feedback information; Perhaps pre-defined network side is selected the standard of special subframe or descending sub frame in end side, and end side can accurately find the special subframe or the descending sub frame of carrying feedback information according to the standard of correspondence.
As shown in Figure 6, in the embodiment of the invention TDD system in the synchronous HARQ TTI bundling schematic diagram of mechanism, the radio frames of supposing a 10ms comprises a special subframe and 9 conventional subframes, comprising 6 descending time slots and 3 ascending time slots, the time of user terminal processes feedback information is 3 subframes, the time of base station deal with data is 3 subframes, three TTI is bound (promptly transmit data and need take three subframes), then adopts the method for the embodiment of the invention:
The process of user terminal initial transmission subframe correspondence 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 subframes, and first descending sub frame (being the P1 place) after the base station can be finished by 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 subframes, after definite feedback information is NACK, the process that can search after processing finishes is 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 subframes, and the time of base station deal with data is 3 subframes, adopts mode informing user terminal pre-configured in standard (this mode can reduce overhead than the high-level signaling notice).
Dispatch 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, determined 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 retransmitting the initial moment, 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, determine feedback information according to result, according to the time of the deal with data finish time and user terminal 40 processing feedback informations, determine a special time slot or descending sub frame, 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, the content of determining described 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, as retransmitting the initial moment, to base station 30 data retransmissions.
In specific implementation process, high-level signaling informing user terminal 40 can be passed through in base station 30 after determining by which special subframe or descending sub frame transmission feedback information; Perhaps the standard of special subframes or descending sub frame is selected in pre-defined base station 30 in user terminal 40, and user terminal 40 can accurately find the special subframe or the descending sub frame of carrying 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.
First module 70 is used for the data of receiving from user terminal are handled, and determines feedback information according to result.
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, determines a special time slot or descending sub frame.
Wherein, second module 80 can further include: first determination module 81, second determination module 82 and selection module 83.
First determination module 81 is used for the time according to the user terminal processes feedback information, determines the initial moment of user terminal data retransmission.
Second determination module 82 is used for determining 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.
Select module 83, be used for selecting a special time slot or descending sub frame between the initial moment of the user terminal processes feedback information determined from the 70 deal with data finish times of first module and second determination module 82.
Three module 90 is used for the special subframe or the descending sub frame that place second module 80 to determine the feedback informations that first module 70 is determined, sends to user terminal.
Shown in Fig. 8 C, second kind of method that sends feedback information in tdd systems of the embodiment of the invention comprises the following steps:
Step a800, network side are handled the data of receiving from end side, determine 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, determine 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 determined 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 determining according to end side, determine 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 specific 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, determine 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, determine 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, determine 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 retransmitting the initial moment, to the network side data retransmission.
In specific implementation process, network side can be notified end side by high-level signaling after determining by which special subframe or descending sub frame transmission feedback information; Perhaps pre-defined network side is selected the standard of special subframe or descending sub frame in end side, and end side can accurately find the special subframe or the descending sub frame of carrying feedback information according to the standard of correspondence.
Shown in Fig. 8 E, in second kind of TDD system of the embodiment of the invention in the synchronous HARQ TTI bundling schematic diagram of mechanism, the radio frames of supposing a 10ms comprises a special subframe and 9 conventional subframes, comprising 7 descending time slots and two ascending time slots, the time of user terminal processes feedback information is 3 subframes, the time of base station deal with data is 3 subframes, two TTI is bound (promptly transmit data and need take two subframes), then adopts the method for the embodiment of the invention:
The process of user terminal initial transmission subframe correspondence 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) that needs 3 subframes at P1, and definite user terminal needs the time of 3 subframes to handle feedback information, thereby the zero-time of determining 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 the base station is from selecting the descending sub frame carrying feedback information of P11 or P12 between P1～P2.
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 subframe) as required, and specific implementation method and subframe are similar, repeat no more.
From the foregoing description as can be seen: embodiment of the invention network side is handled the data of receiving from end side, determines feedback information according to result; First special subframe or first descending sub frame after described network side places processing to finish described feedback information, send to described 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, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (17)
1, a kind of method that sends feedback information in tdd systems is characterized in that this method comprises:
Network side is handled the data of receiving from end side, determines feedback information according to result;
First special subframe or first descending sub frame after described network side places processing to finish described feedback information send to described end side.
2, a kind of in tdd systems the method for end side data retransmission, it 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, described feedback information is handled, determine the content of described feedback information;
Described end side determines that described 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 retransmitting the initial moment, to described network side data retransmission.
3, method as claimed in claim 2 is characterized in that, described end side is according in advance setting or from the high-level signaling of described network side, determines the special subframe or the descending sub frame of the described feedback information of carrying.
4, a kind of method of transmitting data in tdd systems is characterized in that this method comprises:
Network side is handled the data of receiving from end side, determines feedback information according to result, and first special subframe or first descending sub frame after placing processing to finish described feedback information send to described end side;
Described end side extracts described feedback information from described special subframe or descending sub frame, described feedback information is handled, the content of determining described 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, as retransmitting the initial moment, to described network side data retransmission.
5, method as claimed in claim 4 is characterized in that, described end side is according in advance setting or from the high-level signaling of described network side, determines the special subframe or the descending sub frame of the described feedback information of carrying.
6, a kind of 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 determines feedback information according to result, and first special subframe or first descending sub frame after placing processing to finish described feedback information send to described user terminal;
User terminal, be used for extracting described feedback information from described special subframe or descending sub frame, described feedback information is handled, the content of determining described 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, as retransmitting the initial moment, to described base station data retransmission.
7, a kind of 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 determines feedback information according to result;
The feedback information sending module is used for described feedback information is placed first special subframe or first descending sub frame after described data processing module processing finishes, sends to described user terminal.
8, a kind of 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;
Processing module is used for described feedback information is handled.
9, user terminal as claimed in claim 8 is characterized in that, described processing module comprises:
The feedback information processing module is used for the described feedback information that extracts is handled, and determines the content of described feedback information;
Sending module, being used for described feedback information is NACK messages NACK, after described feedback information processing module 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 retransmitting the initial moment, to described base station data retransmission.
10, a kind of method that sends feedback information in tdd systems is characterized in that this method comprises:
Network side is handled the data of receiving from end side, determines feedback information according to result;
Described network side is determined a special time slot or descending sub frame according to the time of the deal with data finish time and described end side processing feedback information, and described feedback information is placed definite special subframe or descending sub frame, sends to described end side.
11, method as claimed in claim 10 is characterized in that, described network side determines that a special time slot or descending sub frame comprise:
According to the time that described end side is handled feedback information, determine the initial moment of described end side data retransmission;
Handle the time of feedback information and the initial moment of described end side data retransmission according to described end side, determine the initial moment of described end side processing feedback information;
Handle between the initial moment of feedback information from the described deal with data finish time and described end side, select a special time slot or descending sub frame.
12, a kind of method of transmitting data in tdd systems is characterized in that this method comprises:
Network side is handled the data of receiving from end side, determine feedback information according to result, according to the time of the deal with data finish time and described end side processing feedback information, determine a special time slot or descending sub frame, described feedback information is placed definite special subframe or descending sub frame, send to described end side;
Described end side extracts described feedback information from described special subframe or descending sub frame, described feedback information is handled, the content of determining described 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, as retransmitting the initial moment, to described network side data retransmission.
13, method as claimed in claim 12 is characterized in that, described network side determines that a special time slot or descending sub frame comprise:
According to the time that described end side is handled feedback information, determine the initial moment of described end side data retransmission;
Handle the time of feedback information and the initial moment of described end side data retransmission according to described end side, determine the initial moment of described end side processing feedback information;
Handle between the initial moment of feedback information from the described deal with data finish time and described end side, select a special time slot or descending sub frame.
14, method as claimed in claim 13 is characterized in that, described end side is according in advance setting or from the high-level signaling of described network side, determines the special subframe or the descending sub frame of the described feedback information of carrying.
15, a kind of 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, determine feedback information according to result, according to the time of the deal with data finish time and described user terminal processes feedback information, determine a special time slot or descending sub frame, described feedback information is placed definite special subframe or descending sub frame, send to described user terminal;
User terminal, be used for extracting described feedback information from described special subframe or descending sub frame, described feedback information is handled, the content of determining described 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, as retransmitting the initial moment, to described base station data retransmission.
16, a kind of 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 determines feedback information according to result;
Second module is used for determining a special time slot or descending sub frame according to the time of handling the finish time and described user terminal processes feedback information;
Three module is used for the described feedback information that described first module is determined is placed described second module definite special subframe or descending sub frame, sends to described user terminal.
17, base station as claimed in claim 16 is characterized in that, described second module comprises:
First determination module is used for the time according to described user terminal processes feedback information, determines the initial moment of described user terminal data retransmission;
Second determination module is used for determining the zero-time of described user terminal processes feedback information according to the time of described user terminal processes feedback information and the initial moment of described user terminal data retransmission;
Select module, be used for selecting a special time slot or descending sub frame between the initial moment of the described deal with data finish time and described user terminal processes feedback information.
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