CN101499884B

CN101499884B - Uplink/downlink retransmission method and system based on wireless communication time division duplex system

Info

Publication number: CN101499884B
Application number: CN 200810006129
Authority: CN
Inventors: 辛雨
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2008-02-03
Filing date: 2008-02-03
Publication date: 2013-05-08
Anticipated expiration: 2028-02-03
Also published as: CN101499884A

Abstract

The invention discloses upstream and downstream data retransmitting methods and systems, and in the downstream data retransmitting method, a mapping relationship between an upstream physical frame and a downstream physical frame group is preliminarily configured; wherein, each downstream physical frame group comprises two adjacent downstream physical frames, and each downstream transmission blockis equally divided into four downstream physical frame groups; a base station sends one or more data sub-packages to one or more terminals by using the downstream physical frame group of the downstream transmission blocks; the terminal demodulates the received data sub-packages of the downstream physical frame group; according to the demodulating result and the mapping relationship, the terminal sends a response message that represents whether the data sub-package demodulation succeeds by using the corresponding upstream physical frame of upstream transmission blocks after the downstream transmission blocks; the base station demodulates the response message and judges whether the data sub-package demodulation succeeds according to the response message, and for the downstream physical frame group with failed data sub-package demodulation, the base station sends a retransmitting data sub-package of the data sub-package with failed demodulation in the next corresponding downstream physical frame group of the downstream transmission blocks.

Description

Uplink/downlink retransmission method and system based on time division duplex system in wireless communication

Technical field

The present invention relates to wireless communication system, particularly, relate to uplink/downlink retransmission method and system based on radio communication time division duplex (Time Division Duplex is referred to as TDD) system.

Background technology

In carrying out the wireless system of transfer of data take superframe (superframe) as unit, the Uplink/Downlink of radio open transmission generally carries out the transmission of data take superframe as unit; Each superframe is comprised of a preamble (leading) and several PHY Frame (physical frame); Preamble and PHY Frame are comprised of for base unit OFDM (OrthogonalFrequency Division Multiplexing, OFDM) Symbol (symbol).

Present UMB (Ultra Mobile Broadband, super mobile broadband), LTE (Long-Term Evolution, Long Term Evolution), Wimax (WorldwideInteroperability for Microwave Access, micro-wave access to global intercommunication) there are two kinds of duplex modes in system, namely, FDD (Frequency Division Duplex, Frequency Division Duplexing (FDD) mode) and TDD (Time Division Duplex, time division duplex) mode.

The FDD mode is that Uplink/Downlink adopts different frequency band transmission, and like this, the resource of the PHY Frames of system's up/down row is distributed relatively independent.

The TDD mode is that Uplink/Downlink uses identical frequency range timesharing to transmit, and this mode need to be divided into PHY frame the uplink and downlink timesharing and transmit.

under the TDD2:1 mode, uplink/downlink PHY frame generally can transmit according to following mode: base station and terminal are carried out transfer of data take superframe as unit, in the duration of a superframe, at first the base station sends leading to terminal, then the downstream transmission blocks that forms by 8 continuous downstream physical frame sends downlink data to terminal, afterwards, base station and terminal do not send data on very first time interval, next, the upstream data that the uplink transmission block that the base station receiving terminal forms by 4 continuous ascending physical signal frames sends, afterwards, base station and terminal do not send data on second time interval, then, the base station sends downlink data by another downstream transmission blocks that 8 continuous downstream physical frame form to terminal again, then, base station and terminal do not send data on the 3rd time interval, then, the base station is the upstream data that sends of another uplink transmission block of forming by 4 continuous ascending physical signal frames of receiving terminal again.

The present inventor finds in implementation process, in the transmission method of the upstream or downstream data under above-mentioned TDD2:1 mode, all do not provide the re-transmission solution of upstream data or downlink data, and want the correct sending and receiving of completing data, retransmission mechanism is obvious and requisite.Therefore, need a kind of technical scheme that can make up this defective.

Summary of the invention

Considering in the data upstream transmission under the TDD2:1 mode that exists in correlation technique or downlink transmission process needs a kind of problem of data re-transmission mechanism and proposes the present invention, for this reason, the present invention aims to provide a kind of uplink retransmission method and system based on tdd systems, and a kind of downlink retransmission method based on tdd systems and system are provided, make up the defects in correlation technique to realize a kind of retransmission mechanism.

According to an aspect of the present invention, a kind of downlink retransmission method based on time division duplex system in wireless communication is provided, above-mentioned time division duplex system in wireless communication is used for downlink transfer based on the downstream transmission blocks that will comprise 8 continuous downstream physical frame, will comprise that the uplink transmission block of 4 continuous ascending physical signal frames is used for the time division duplex of uplink.

Comprise following processing according to the downlink retransmission method of the embodiment of the present invention: the mapping relations that set in advance ascending physical signal frame and downstream physical frame group, wherein, each downstream physical frame group comprises 2 adjacent downstream physical frame, and a downstream transmission blocks is divided into 4 downstream physical frame groups; The base station uses the downstream physical frame group of downstream transmission blocks to send one or more data sub-packets to one or more terminals; The data sub-packets of the downstream physical frame group that the terminal demodulation receives; Based on demodulation result and above-mentioned mapping relations, the corresponding ascending physical signal frame of the uplink transmission block of terminal after downstream transmission blocks send be used for expression whether successful demodulation the response message of data sub-packets; Base station demodulation response message, and whether demodulation is successful to judge data sub-packets according to response message, for the downstream physical frame group of data sub-packets demodulation failure, base station corresponding downstream physical frame group in next downstream transmission blocks sends the data retransmission attached bag of the data sub-packets of demodulation failure.

In said method, any or a plurality of downstream physical frame of base station in the downstream physical frame group sends one or more data sub-packets.

Wherein, above-mentioned mapping relations are: 8 the continuous downstream physical frame in downstream transmission blocks are divided into 4 downstream physical frame groups according to the position sequencing, and each downstream physical frame group is corresponding one by one according to sequencing in position with 4 continuous ascending physical signal frames in uplink transmission block.

Wherein, each ascending physical signal frame is corresponding to the one or more downstream physical frame in the downstream physical frame group that has corresponding relation with it.

In addition, said method also comprises following processing: for the downstream physical frame group of data sub-packets demodulation success, base station corresponding downstream physical frame group in next downstream transmission blocks sends other data sub-packets.

Preferably, said method further comprises following processing: set in advance retransmission threshold value, and in the situation that the number of retransmissions of the data sub-packets of demodulation failure reaches retransmission threshold value, no longer retransmit.Wherein, the data retransmission attached bag that the base station sends for the n time is n level data retransmission attached bag, and wherein, n＜=N, N are retransmission threshold value.

Preferably, the operation of base station data retransmission attached bag of the data sub-packets of corresponding downstream physical frame group transmission demodulation failure in next downstream transmission blocks is specially: the position of the downstream physical frame group that the base station is corresponding according to mapping relations definite response message; According to the position of determining, the corresponding downstream physical frame group in next downstream transmission blocks is determined in the base station, wherein, and the position of corresponding downstream physical frame group in next downstream transmission blocks and the position consistency of determining; The base station sends retransmission data packet may in corresponding downstream physical frame group.

Wherein, above-mentioned a plurality of data sub-packets can send to same terminal, also can send to a plurality of terminals.

According to a further aspect in the invention, a kind of descending retransmission system based on time division duplex system in wireless communication is provided, above-mentioned time division duplex system in wireless communication is used for downlink transfer based on the downstream transmission blocks that will comprise 8 continuous downstream physical frame, to comprise that the uplink transmission block of 4 continuous ascending physical signal frames is used for the time division duplex of uplink, this descending retransmission system comprises a base station and one or more terminal.

In the descending retransmission system according to the embodiment of the present invention, the base station comprises: the downlink transfer unit, be used for using the downstream physical frame group of downstream transmission blocks to send one or more data sub-packets to one or more terminals, wherein, each downstream physical frame group comprises 2 adjacent downstream physical frame, and a downstream transmission blocks is divided into 4 downstream physical frame groups; The response message demodulating unit is used for receiving the also response message of demodulation terminal transmission, and whether demodulation is successful to judge data sub-packets according to response message; Retransmission unit is for send the data retransmission attached bag of the data sub-packets of demodulation failure in the specific downstream physical frame group of next downstream transmission blocks; Terminal comprises: demodulating unit is used for the data sub-packets of the downstream physical frame group that the demodulation terminal receives; The uplink unit, be used for specified upstream physical frame at uplink transmission block send to the base station be used for expression whether successful demodulation the response message of data sub-packets.

Wherein, above-mentioned specified upstream physical frame is the corresponding ascending physical signal frame of the downstream physical frame group with sending data sub-packets of determining according to predefined mapping relations, wherein, mapping relations are: 8 the continuous downstream physical frame in downstream transmission blocks are divided into 4 downstream physical frame groups according to the position sequencing, and each downstream physical frame group is corresponding one by one according to sequencing in position with 4 continuous ascending physical signal frames in uplink transmission block.

In addition, the position consistency of downstream physical frame group in downstream transmission blocks of the data sub-packets of the position of above-mentioned specific downstream physical frame group in next downstream transmission blocks and transmission demodulation failure.

According to a further aspect in the invention, a kind of uplink retransmission method based on time division duplex system in wireless communication is provided, above-mentioned time division duplex system in wireless communication is used for downlink transfer based on the downstream transmission blocks that will comprise 8 continuous downstream physical frame, will comprise that the uplink transmission block of 4 continuous ascending physical signal frames is used for the time division duplex of uplink.

Comprise following processing according to the uplink retransmission method of the embodiment of the present invention: the mapping relations that set in advance ascending physical signal frame and downstream physical frame group, wherein, each downstream physical frame group comprises 2 adjacent downstream physical frame, and a downstream transmission blocks is divided into 4 downstream physical frame groups; One or more terminals use the ascending physical signal frame of uplink transmission block to send one or more data sub-packets to the base station; The data sub-packets of the ascending physical signal frame that the base station demodulation receives; Based on demodulation result and mapping relations, the corresponding downstream physical frame group of the downstream transmission blocks of base station after uplink transmission block send be used for expression whether successful demodulation the response message of data sub-packets; Terminal demodulation response message, and whether demodulation is successful to judge data sub-packets according to response message, for the ascending physical signal frame of data sub-packets demodulation failure, terminal corresponding ascending physical signal frame in next uplink transmission block sends the data retransmission attached bag of the data sub-packets of demodulation failure.

In said method, any or a plurality of downstream physical frame of base station in the downstream physical frame group sends response message.

In addition, said method further comprises: for the ascending physical signal frame of data sub-packets demodulation success, terminal corresponding ascending physical signal frame in next uplink transmission block sends other data sub-packets.

Preferably, said method further comprises: set in advance retransmission threshold value, and in the situation that the number of retransmissions of the data sub-packets of demodulation failure reaches retransmission threshold value, no longer retransmit.Wherein, the data retransmission attached bag that terminal sends for the n time is n level data retransmission attached bag, and wherein, n＜=N, N are retransmission threshold value.

Wherein, the operation of above-mentioned terminal data retransmission attached bag of the data sub-packets of corresponding ascending physical signal frame transmission demodulation failure in next uplink transmission block is specially: the position of the ascending physical signal frame that terminal is corresponding according to above-mentioned mapping relations definite response message; According to the position of determining, terminal is determined the corresponding ascending physical signal frame in next uplink transmission block, wherein, and the position of above-mentioned corresponding ascending physical signal frame in next uplink and the position consistency of determining; Terminal sends retransmission data packet may at corresponding ascending physical signal frame.

According to a further aspect in the invention, a kind of uplink retransmission system based on time division duplex system in wireless communication is provided, above-mentioned time division duplex system in wireless communication is used for downlink transfer based on the downstream transmission blocks that will comprise 8 continuous downstream physical frame, will comprise that the uplink transmission block of 4 continuous ascending physical signal frames is used for the time division duplex of uplink.This descending retransmission system comprises a base station and one or more terminal.

In the uplink retransmission system according to the embodiment of the present invention, terminal comprises: the uplink unit is used for using the ascending physical signal frame of uplink transmission block to send one or more data sub-packets to the base station; The response message demodulating unit is used for receiving the also response message of demodulation base station transmission, and whether demodulation is successful to judge data sub-packets according to response message; Retransmission unit is for send the data retransmission attached bag of the data sub-packets of demodulation failure at the specified upstream physical frame of next uplink transmission block; The base station comprises: demodulating unit is used for the data sub-packets of the ascending physical signal frame that the demodulation base station receives; The downlink transfer unit, be used for the specific downstream physical frame group of downstream transmission blocks to terminal send be used for expression whether successful demodulation the response message of data sub-packets, wherein, each downstream physical frame group comprises 2 adjacent downstream physical frame, and a downstream transmission blocks is divided into 4 downstream physical frame groups.

Wherein, above-mentioned specific downstream physical frame group is the corresponding downstream physical frame group of the ascending physical signal frame with sending data sub-packets of determining according to predefined mapping relations, wherein, mapping relations are: 8 the continuous downstream physical frame in downstream transmission blocks are divided into 4 downstream physical frame groups according to the position sequencing, and each downstream physical frame group is corresponding one by one according to sequencing in position with 4 continuous ascending physical signal frames in uplink transmission block.

Wherein, the position consistency of ascending physical signal frame in uplink transmission block of the data sub-packets of the position of specified upstream physical frame in next uplink transmission block and transmission demodulation failure.

By above-mentioned at least one technical scheme provided by the invention, under the TDD2:1 mode, in downlink transfer, reply symbol by the ascending physical signal frame transmission corresponding with the downstream physical frame group in uplink transmission block, in uplink, reply symbol by the corresponding downstream physical frame group transmission in the downstream transmission blocks corresponding with the ascending physical signal frame, realized the re-transmission of data, thereby made up the defective that lacks a kind of retransmission mechanism in the correlation technique.

Other features and advantages of the present invention will be set forth in the following description, and, partly become apparent from specification, perhaps understand by implementing the present invention.Purpose of the present invention and other advantages can realize and obtain by specifically noted structure in the specification of writing, claims and accompanying drawing.

Description of drawings

Accompanying drawing is used to provide a further understanding of the present invention, and consists of the part of specification, is used for together with embodiments of the present invention explaining the present invention, is not construed as limiting the invention.In the accompanying drawings:

Fig. 1 is the flow chart based on the downlink retransmission method of TDD system according to the embodiment of the present invention;

Fig. 2 (a) and Fig. 2 (b) are the schematic diagrames of the example 1 of method shown in Figure 1;

Fig. 3 is the structured flowchart based on the descending retransmission system of TDD system according to the embodiment of the present invention;

Fig. 4 is the flow chart based on the uplink retransmission method of TDD system according to the embodiment of the present invention;

Fig. 5 (a) and Fig. 5 (b) are the schematic diagrames of the example 2 of method shown in Figure 5;

Fig. 6 is the structured flowchart based on the uplink retransmission system of TDD system according to the embodiment of the present invention.

Embodiment

Below in conjunction with accompanying drawing, the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, is not intended to limit the present invention.

Embodiment of the method one

At first, the problem that lacks a kind of retransmission mechanism in downlink data transmission for the TDD2:1 mode, the embodiment of the present invention provides a kind of downlink retransmission method based on wireless communications tdd system, above-mentioned wireless communications tdd system is used for downlink transfer based on the downstream transmission blocks that will comprise 8 continuous downstream physical frame, to comprise that the uplink transmission block of 4 continuous ascending physical signal frames is used for the TDD mode (that is, TDD2:1 mode) of uplink.

Fig. 1 is the flow chart based on the downlink retransmission method of wireless communications tdd system according to the embodiment of the present invention.As shown in Figure 1, the method comprises following processing:

Step S102 sets in advance the mapping relations of ascending physical signal frame and downstream physical frame group, and wherein, each downstream physical frame group comprises 2 adjacent downstream physical frame, and a downstream transmission blocks is divided into 4 downstream physical frame groups;

Step S104, the base station uses the downstream physical frame group of downstream transmission blocks to send one or more data sub-packets to one or more terminals;

Step S106, the data sub-packets of the downstream physical frame group that the terminal demodulation receives;

Step S108, based on demodulation result and above-mentioned mapping relations, the corresponding ascending physical signal frame of the uplink transmission block of terminal after downstream transmission blocks send be used for expression whether successful demodulation the response message of data sub-packets;

Step S110, the base station receives and the demodulation response message, and whether demodulation is successful to judge data sub-packets according to response message, for the downstream physical frame group of data sub-packets demodulation failure, base station corresponding downstream physical frame group in next downstream transmission blocks sends the data retransmission attached bag of the data sub-packets of demodulation failure.

Below will further describe the details in each step of above-mentioned processing.

(1) step S102

The mapping relations of mentioning in this step are: 8 the continuous downstream physical frame in downstream transmission blocks are divided into 4 downstream physical frame groups according to the position sequencing, and are corresponding one by one according to sequencing in position with 4 continuous ascending physical signal frames in uplink transmission block.That is, in downstream transmission blocks the 1st and the 2nd downstream physical frame be corresponding to the 1st ascending physical signal frame in uplink transmission block, and in like manner, the 3rd and the 4th downstream physical frame be corresponding to the 2nd ascending physical signal frame, the like.Certainly, also other corresponding relation can be set, the present invention is not limited in this respect.

Particularly, each ascending physical signal frame is corresponding to the one or more downstream physical frame in the downstream physical frame group that has corresponding relation with it.For example, the 1st ascending physical signal frame in uplink transmission block can be corresponding to the 1st downstream physical frame in the first downstream physical frame group, also can be corresponding to the 2nd downstream physical frame in the first downstream physical frame group, also can be corresponding to the 1st and the 2nd downstream physical frame.

(2) step S104

for example, in the unit of transfer of a superframe, the base station sends downlink data by the downstream transmission blocks that 8 continuous downstream physical frame form to terminal, as mentioned above, in these 8 downstream physical frame, every continuous 2 physical frames are made as one group, that is to say, the the 1st and the 2nd physical frame is made as one group, the the 3rd and the 4th physical frame is made as one group, the the 5th and the 6th physical frame is made as one group, the the 7th and the 8th physical frame is made as one group, in order to set forth conveniently, the position of these 4 physical frame groups is defined as respectively L0, L1, L2, L3, for the data sub-packets from these 4 downstream physical frame group position transmissions, be defined as respectively P0, P1, P2, P3, that is to say, the data sub-packets that sends in first physical frame groups of downstream transmission blocks is defined as P0, other the like.The data sub-packets of these 4 diverse locations can be issued same terminal, can be also to issue different terminals.The original position that data sub-packets sends can be in first downstream transmission blocks of superframe, also can be in second downstream transmission blocks of superframe.

In the present invention, for convenience of description, the tentation data attached bag first begins transmission from first downstream transmission blocks of superframe, and supposes that 4 positions have all sent data sub-packets, and 4 data attached bags send to same terminal.

(3) step S106 and step S108

The terminal demodulation after the data sub-packets of these 4 diverse locations, will send respectively ACK or NACK message on the uplink transmission block that ensuing 4 continuous ascending physical signal frames form.ACK represents terminal success demodulating data, and NACK represents that terminal does not have successful demodulating data.According to the mapping relations that arrange in step S102, the ACK/NACK message of these 4 diverse locations is distinguished corresponding P0 successively, P1, P2, the data sub-packets of these 4 diverse locations of P3.

(4) step S110

In this step, the base station operation that corresponding downstream physical frame group sends the data retransmission attached bag in next downstream transmission blocks is specially: the base station is according to the position of downstream physical frame group corresponding to mapping relations definite response message (ACK/NACK); According to the position of determining, the corresponding downstream physical frame group in next downstream transmission blocks is determined in the base station, wherein, and the position of corresponding downstream physical frame group in next downstream transmission blocks and the position consistency of determining; Afterwards, the base station sends retransmission data packet may in corresponding downstream physical frame group.

Particularly, the base station is the ACK/NACK message of these 4 diverse locations of demodulation at first, if NACK message, the expression terminal does not have successful demodulating data, the base station sends first order data retransmission attached bag on the respective channel resource of the upper corresponding downstream physical frame group of the downstream transmission blocks (that is, next downstream transmission blocks) that ensuing 8 continuous downstream physical frame form position.Need to prove, the data sub-packets of data retransmission attached bag and original transmission can be identical, also can be not identical.

In addition, in step S110: for the downstream physical frame of data sub-packets demodulation success, base station corresponding downstream physical frame group in next downstream transmission blocks sends other data sub-packets.Namely, if ACK message, expression terminal success demodulating data, corresponding physical frame groups position on the downstream transmission blocks that ensuing 8 continuous downstream physical frame form, base station sends other data sub-packets (the HARQ retransmission processing method of other data sub-packets is identical with data sub-packets).

Preferably, in this embodiment, also comprise following processing: set in advance retransmission threshold value, and in the situation that the number of retransmissions of the data sub-packets of demodulation failure reaches retransmission threshold value, no longer retransmit.Wherein, the data retransmission attached bag that the base station sends for the n time is n level data retransmission attached bag, and wherein, n＜=N, N are retransmission threshold value.

Based on foregoing, next, if the correct demodulation of terminal after first order data retransmission attached bag, corresponding physical frame position sends ACK message on the uplink transmission block that ensuing 4 continuous ascending physical signal frames form; If terminal does not have correct demodulation first order data retransmission attached bag, corresponding physical frame position sends NACK message on the uplink transmission block that ensuing 4 continuous ascending physical signal frames form.

Afterwards, the ACK/NACK message of these 4 diverse locations of base station demodulation, if ACK message, expression terminal success demodulating data, downstream physical frame group position corresponding to base station (downstream transmission blocks at this moment should be first downstream transmission blocks in ensuing another superframe, and the border of superframe is unrestricted) on the downstream transmission blocks that ensuing 8 continuous downstream physical frame form sends other data sub-packets; If NACK message, the expression terminal does not still have successful demodulating data, and the base station sends second level data retransmission attached bag on the respective channel resource of corresponding downstream physical frame group position on the downstream transmission blocks that above-mentioned ensuing 8 continuous downstream physical frame form.

That is to say, as long as the correct demodulation downlink data of terminal attached bag, just the ascending physical signal frame position in correspondence sends ACK message, and the base station receives ACK message, and just the downlink physical frame position in correspondence sends other data sub-packets; As long as terminal does not have correct demodulation downlink data attached bag, just the ascending physical signal frame position in correspondence sends NACK message, the base station receives NACK message, just need to send N level data retransmission attached bag on the respective channel resource of the downlink physical frame position of correspondence, usually, can with retransmission threshold value N be set to 5, also can be other positive integer.

Example 1

in the unit of transfer of a superframe, the base station sends downlink data by the downstream transmission blocks that 8 continuous downstream physical frame form to terminal, in these 8 downstream physical frame, every continuous 2 physical frames are made as one group, that is to say, the the 1st and the 2nd physical frame is made as one group, the the 3rd and the 4th physical frame is made as one group, the the 5th and the 6th physical frame is made as one group, the the 7th and the 8th physical frame is made as one group, in order to set forth conveniently, the position of these 4 physical frame groups is defined as respectively L0, L1, L2, L3, data sub-packets for these 4 downstream physical frame group position transmissions, be defined as respectively P0, P1, P2, P3, namely, the data sub-packets that sends in first physical frame groups of downstream transmission blocks is defined as P0, the data sub-packets of second physical frame groups transmission is defined as P1.Wherein, in this example, the downstream transmission blocks of data sub-packets original transmission is unrestricted in the position of superframe, can be first downstream transmission blocks, can be also second downstream transmission blocks.The HARQ retransmission process not restriction of the border of Superframe to the data attached bag.

To send data sub-packets P0 as example, P0 is in the upper transmission of descending first physical frame groups L0 shown in Fig. 2 (a), that is, P0 can send on physical frame F0 or F1, also can cross over two physical frames and send, also namely send on two physical frame F0 and F1 simultaneously.

If the correct demodulation P0 of terminal sends ACK message in the position of R0, as shown in Fig. 2 (a), after the base station receives ACK message, in first physical frame groups of ensuing downstream transmission blocks, is also that the position of F8, F9 sends other data sub-packets P ' 0; The HARQ retransmission processing method of other data sub-packets P ' 0 is identical with data sub-packets P0's.

If terminal does not have correct demodulation P0, send NACK message in the position of R0, as shown in Fig. 2 (b), after the base station receives NACK message, in first physical frame groups of ensuing downstream transmission blocks, be also to send first order data retransmission attached bag R1P0 on the respective channel resource of position of F8, F9.

If the correct demodulation of terminal after first order data retransmission attached bag, send ACK message in the position of R4; After the base station receives ACK message, send other data sub-packets P ' 0 in the position of first physical frame groups of ensuing downstream transmission blocks (downstream transmission blocks at this moment should be first downstream transmission blocks in ensuing another superframe, and the border of superframe is unrestricted).

If terminal does not have correct demodulation first order data retransmission attached bag, send NACK message in the position of R4.After the base station receives NACK message, send second level data retransmission attached bag R2P0 on the respective channel resource of first physical frame groups position of ensuing downstream transmission blocks (downstream transmission blocks at this moment should be first downstream transmission blocks in ensuing another superframe, and the border of superframe is unrestricted).

As long as the correct demodulation downlink data of terminal attached bag, just in the ascending physical signal frame position transmission ACK of correspondence message, the base station receives ACK message, just sends other data sub-packets in the downstream physical frame group position of correspondence; As long as terminal does not have correct demodulation downlink data attached bag, just the ascending physical signal frame position in correspondence sends NACK message, the base station receives NACK message, just need to send N level data retransmission attached bag on the respective channel resource of the downstream physical frame group position of correspondence, usually, can be set to 5 by retransmission threshold value N, also can be other positive integer.

System embodiment one

According to the embodiment of the present invention, a kind of descending retransmission system based on wireless communications tdd system is provided, above-mentioned wireless communications tdd system is used for downlink transfer based on the downstream transmission blocks that will comprise 8 continuous downstream physical frame, to comprise that the uplink transmission block of 4 continuous ascending physical signal frames is used for the TDD mode (that is, TDD2:1 mode) of uplink.

This descending retransmission system can comprise a base station and one or more terminal.For convenience of description, only show a base station and a terminal in Fig. 3.

As shown in Figure 3, in the descending retransmission system according to the embodiment of the present invention, the base station comprises downlink transfer unit 302, response message demodulating unit 304, retransmission unit 306; Terminal comprises demodulating unit 308 and uplink unit 310.

Particularly, downlink transfer unit 302 is used for using the downstream physical frame group of downstream transmission blocks to send one or more data sub-packets to one or more terminals, wherein, each downstream physical frame group comprises 2 adjacent downstream physical frame, and a downstream transmission blocks is divided into 4 downstream physical frame groups; Response message demodulating unit 304 is used for receiving the also response message of demodulation terminal transmission, and whether demodulation is successful to judge data sub-packets according to response message; Retransmission unit 306 is used for sending in the specific downstream physical frame group of next downstream transmission blocks the data retransmission attached bag of the data sub-packets of demodulation failure.

Demodulating unit 308 is connected to downlink transfer unit 302 and retransmission unit 306, is used for the data sub-packets of the downstream physical frame group that the demodulation terminal receives; Uplink unit 310 can be connected to demodulating unit 308 and response message demodulating unit 304, be used for specified upstream physical frame at uplink transmission block send to the base station be used for expression whether successful demodulation the response message of data sub-packets.

Ins and outs in this system embodiment one can be understood and implement with reference to the technical scheme of above-mentioned embodiment of the method one, for same or analogous content, no longer are repeated in this description at this.

Can find out by top description, the technical scheme that provides by means of embodiment of the method one or system embodiment one, in TDD2:1 mode downlink data transmission, by making terminal send response message on the ascending physical signal frame corresponding with the downstream physical frame group, the base station can retransmit downlink data, thereby can guarantee the accuracy of downlink data transmission.

Embodiment of the method two

According to the embodiment of the present invention, a kind of uplink retransmission method based on wireless communications tdd system is provided, above-mentioned wireless communications tdd system is used for downlink transfer based on the downstream transmission blocks that will comprise 8 continuous downstream physical frame, will comprise that the uplink transmission block of 4 continuous ascending physical signal frames is used for the TDD mode of uplink.

As shown in Figure 4, the uplink retransmission method according to the embodiment of the present invention comprises following processing:

Step S402 sets in advance the mapping relations of ascending physical signal frame and downstream physical frame group, and wherein, each downstream physical frame group comprises 2 adjacent downstream physical frame, and a downstream transmission blocks is divided into 4 downstream physical frame groups;

Step S404, one or more terminals use the ascending physical signal frame of uplink transmission block to send one or more data sub-packets to the base station;

Step S406, the data sub-packets of the ascending physical signal frame that the base station demodulation receives;

Step S408, based on demodulation result and mapping relations, the corresponding downstream physical frame group of the downstream transmission blocks of base station after uplink transmission block send be used for expression whether successful demodulation the response message of data sub-packets;

Step S410, terminal receives and the demodulation response message, and whether demodulation is successful to judge data sub-packets according to response message, for the ascending physical signal frame of data sub-packets demodulation failure, terminal corresponding ascending physical signal frame in next uplink transmission block sends the data retransmission attached bag of the data sub-packets of demodulation failure.

(1) step S402

The mapping relations of mentioning in this step are: continuous 8 downstream physical frame in downstream transmission blocks are corresponding one by one according to sequencing in position with 4 the continuous ascending physical signal frames in uplink transmission block.That is, in downstream transmission blocks the 1st and the 2nd downstream physical frame be corresponding to the 1st ascending physical signal frame in uplink transmission block, and in like manner, the 3rd and the 4th downstream physical frame be corresponding to the 2nd ascending physical signal frame, the like.Certainly, also other corresponding relation can be set, the present invention is not limited in this respect.

(2) step S404

For example, in the unit of transfer of a superframe, as mentioned above, the downstream transmission blocks that 8 continuous downstream physical frame are formed is divided into 4 groups, that is, in these 8 downstream physical frame, every two continuous downstream physical frame are made as one group, that is to say, the the 1st and the 2nd downstream physical frame is made as one group, and the 3rd and the 4th downstream physical frame is made as one group, and the 5th and the 6th downstream physical frame is made as one group, the the 7th and the 8th downstream physical frame is made as one group, in order to set forth conveniently, the position of these 4 physical frame groups is defined as respectively L0, L1, L2, L3.Simultaneously, terminal by the data sub-packets that 4 continuous ascending physical signal frame position send, is defined as respectively P0, P1, P2, P3.The data sub-packets of these 4 diverse locations can send to the base station by a terminal, also can send to the base station by different terminals.The original position that data sub-packets sends can be at first uplink transmission block of superframe, also can be at second uplink transmission block of superframe.

In the present invention, for convenience of description, the tentation data attached bag first begins transmission from first uplink transmission block of superframe, and supposes that 4 positions have all sent data sub-packets, and 4 data attached bags send to the base station by same terminal.

(3) step S406 and step S408

The base station demodulation after this data sub-packets of 4, will be on the downstream transmission blocks that ensuing 8 continuous downstream physical frame form corresponding downstream physical frame group position sends respectively ACK or NACK message.ACK represents base station success demodulating data, and NACK represents that the base station does not have successful demodulating data.According to the mapping relations that arrange in step S102, the ACK/NACK message of these 4 diverse locations is distinguished corresponding P0 successively, P1, P2, P3, the data sub-packets of these 4 diverse locations.

(4) step S410

In this step, the terminal operation that corresponding ascending physical signal frame sends the data retransmission attached bag in next uplink transmission block is specially: terminal is according to the position of ascending physical signal frame corresponding to mapping relations definite response message (ACK/NACK); According to the position of determining, terminal is determined the corresponding ascending physical signal frame in next uplink transmission block, wherein, and the position of corresponding ascending physical signal frame in next uplink and the position consistency of determining; Afterwards, terminal sends retransmission data packet may at corresponding ascending physical signal frame.

Particularly, terminal is the ACK/NACK message of these 4 diverse locations of demodulation at first, if NACK message, the expression base station does not have successful demodulating data, terminal sends first order data retransmission attached bag on the respective channel resource of the ascending physical signal frame position of the upper correspondence of uplink transmission block (that is, next uplink transmission block) that ensuing 4 continuous ascending physical signal frames form.Need to prove, the data sub-packets of data retransmission attached bag and original transmission can be identical, also can be not identical.

In addition, in step S410: for the ascending physical signal frame of data sub-packets demodulation success, terminal corresponding ascending physical signal frame in next uplink transmission block sends other data sub-packets.Namely, if ACK message, expression base station success demodulating data, terminal corresponding physical frame position on the uplink transmission block that ensuing 4 continuous ascending physical signal frames form sends other data sub-packets (the HARQ retransmission processing method of other data sub-packets is identical with data sub-packets).

Preferably, in this embodiment, also comprise following processing: set in advance retransmission threshold value, and in the situation that the number of retransmissions of the data sub-packets of demodulation failure reaches retransmission threshold value, no longer retransmit.Wherein, the data retransmission attached bag that terminal sends for the n time is n level data retransmission attached bag, and wherein, n＜=N, N are retransmission threshold value.

Based on foregoing, next, if the correct demodulation in base station after first order data retransmission attached bag, corresponding downstream physical frame group position sends ACK message on the downstream transmission blocks that ensuing 8 continuous downstream physical frame form; If the base station does not have correct demodulation first order data retransmission attached bag, corresponding downstream physical frame group position sends NACK message on the downstream transmission blocks that ensuing 8 continuous downstream physical frame form.

Afterwards, the ACK/NACK message of these 4 diverse locations of terminal demodulation, if ACK message, expression base station success demodulating data, terminal ascending physical signal frame position corresponding to (uplink transmission block at this moment should be first uplink transmission block in ensuing another superframe, and the border of superframe is unrestricted) on the uplink transmission block that ensuing 4 continuous ascending physical signal frames form sends other data sub-packets; If NACK message, the expression base station does not still have successful demodulating data, and terminal sends second level data retransmission attached bag on the respective channel resource of ascending physical signal frame position corresponding on the uplink transmission block that above-mentioned ensuing 4 continuous ascending physical signal frames form.

That is to say, as long as base station correct demodulation downlink data attached bag, just in the downstream physical frame group position transmission ACK of correspondence message, terminal receives ACK message, and just the ascending physical signal frame position in correspondence sends other data sub-packets; As long as the base station does not have correct demodulation upstream data attached bag, just in the downstream physical frame group position transmission NACK of correspondence message, terminal receives NACK message, just need to send N level data retransmission attached bag on the respective channel resource of the ascending physical signal frame position of correspondence, usually, can with retransmission threshold value N be set to 5, also can be other positive integer.

Example 2

In the unit of transfer of a superframe, terminal sends upstream data by the uplink transmission block that 4 continuous ascending physical signal frames form to the base station, data sub-packets for these 4 ascending physical signal frame position transmissions, be defined as respectively P0, P1, P2, P3, that is, the data sub-packets that sends at first physical frame of uplink transmission block is defined as P0, and the data sub-packets of second physical frame transmission is defined as P1.Wherein, in this example, the uplink transmission block of data sub-packets original transmission is unrestricted in the position of superframe, can be first uplink transmission block, can be also second uplink transmission block.The HARQ retransmission process not restriction of the border of Superframe to the data attached bag.

To send data sub-packets P0 as example, P0 is in the upper transmission of up first physical frame R0 shown in Fig. 5 (a).

If the correct demodulation P0 in base station sends ACK message in the position of first physical frame groups of ensuing downstream transmission blocks, also, ACK message can send on physical frame F8 or F9.As shown in Fig. 5 (a), after terminal receives ACK message, at first physical frame of ensuing uplink transmission block, be also that the position of R4 sends other data sub-packets P ' 0; The HARQ retransmission processing method of other data sub-packets P ' 0 is identical with data sub-packets P0.

If the base station does not have correct demodulation P0, send NACK message in the position of first physical frame groups of ensuing downstream transmission blocks, also, NACK message can send on physical frame F8 or F9.As shown in Fig. 5 (b), after terminal receives NACK message, on being also the respective channel resource of R4 position, first physical frame of ensuing uplink transmission block sends first order data retransmission attached bag R1P0.

If the correct demodulation in base station first order data retransmission attached bag, in first physical frame groups position transmission ACK of ensuing downstream transmission blocks (downstream transmission blocks at this moment should be first downstream transmission blocks in ensuing another superframe, and the border of superframe is unrestricted) message; After terminal receives ACK message, send other data sub-packets P ' 0 in the position of first physical frame of ensuing uplink transmission block (uplink transmission block at this moment should be first uplink transmission block in ensuing another superframe, and the border of superframe is unrestricted).

If the base station does not have correct demodulation first order data retransmission attached bag, in first physical frame groups position transmission NACK of ensuing downstream transmission blocks (downstream transmission blocks at this moment should be first downstream transmission blocks in ensuing another superframe, and the border of superframe is unrestricted) message; After terminal receives NACK message, send second level data retransmission attached bag R2P0 on the respective channel resource of first physical frame position of ensuing uplink transmission block (uplink transmission block at this moment should be first uplink transmission block in ensuing another superframe, and the border of superframe is unrestricted).

In like manner, as long as base station correct demodulation downlink data attached bag, just in the downstream physical frame group position transmission ACK of correspondence message, terminal receives ACK message, and just the ascending physical signal frame position in correspondence sends other data sub-packets; As long as the base station does not have correct demodulation downlink data attached bag, just in the downstream physical frame group position transmission NACK of correspondence message, terminal receives NACK message, just need to send N level data retransmission attached bag on the respective channel resource of the ascending physical signal frame position of correspondence, usually, can be set to 5 by retransmission threshold value N, also can be other positive integer.

By that analogy, for P1, P2, the HARQ retransmission processing method of P3 data sub-packets is identical with data sub-packets P0's, different is, corresponds respectively to the 2nd to the 4th physical frame groups position in downstream transmission blocks, and uplink transmission block corresponds respectively to the 2nd to the 4th physical frame position.

System embodiment two

According to a further aspect in the invention, a kind of uplink retransmission system based on wireless communications tdd system is provided, above-mentioned wireless communications tdd system is used for downlink transfer based on the downstream transmission blocks that will comprise 8 continuous downstream physical frame, to comprise that the uplink transmission block of 4 continuous ascending physical signal frames is used for the TDD mode (that is, TDD2:1 mode) of uplink.

This descending retransmission system can comprise a base station and one or more terminal, for convenience of description, a base station and a terminal has been shown in Fig. 6.Wherein, terminal comprises: uplink unit 602, response message demodulating unit 604, retransmission unit 606, the base station comprises: demodulating unit 608, downlink transfer unit 610.

Particularly, uplink unit 602 is used for using the ascending physical signal frame of uplink transmission block to send one or more data sub-packets to the base station; Response message demodulating unit 604 is used for receiving the also response message of demodulation base station transmission, and whether demodulation is successful to judge data sub-packets according to response message; Retransmission unit 606 is used for sending at the specified upstream physical frame of next uplink transmission block the data retransmission attached bag of the data sub-packets of demodulation failure.

Demodulating unit 608 is connected to uplink unit 602 and retransmission unit 606, is used for the data sub-packets of the ascending physical signal frame that the demodulation base station receives; Downlink transfer unit 610 can be connected to demodulating unit 608 and response message demodulating unit 604, be used for the specific downstream physical frame group of downstream transmission blocks to terminal send be used for expression whether successful demodulation the response message of data sub-packets, wherein, each downstream physical frame group comprises 2 adjacent downstream physical frame, and a downstream transmission blocks is divided into 4 downstream physical frame groups.

Wherein, above-mentioned specific downstream physical frame group is the corresponding downstream physical frame of the ascending physical signal frame with sending data sub-packets of determining according to predefined mapping relations, wherein, mapping relations are: 8 the continuous downstream physical frame in downstream transmission blocks are divided into 4 downstream physical frame groups according to the position sequencing, and each downstream physical frame group is corresponding one by one according to sequencing in position with 4 continuous ascending physical signal frames in uplink transmission block.

Wherein, the position consistency of ascending physical signal frame in uplink transmission block of the data sub-packets of the above-mentioned position of specified upstream physical frame in next uplink transmission block and transmission demodulation failure.

Ins and outs in this system embodiment two can be understood and implement with reference to the technical scheme of above-mentioned embodiment of the method two, for same or analogous content, no longer are repeated in this description at this.

Can find out by top description, the technical scheme that provides by means of embodiment of the method two or system embodiment two, in transmitting uplink data under the TDD2:1 mode, by making the base station send response message on the downstream physical frame group corresponding with the ascending physical signal frame, terminal can retransmit upstream data, thereby can guarantee the accuracy of transmitting uplink data.

As mentioned above, by means of above-mentioned at least one technical scheme that provides by the embodiment of the present invention, under the TDD2:1 mode, in downlink transfer, reply symbol by ascending physical signal frame transmission corresponding with the downstream physical frame group in uplink transmission block, perhaps in uplink, reply symbol by the corresponding downstream physical frame group transmission in the downstream transmission blocks corresponding with the ascending physical signal frame, realize the re-transmission of data, thereby made up the defective that lacks a kind of retransmission mechanism in the correlation technique.

The above is only the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.

Claims

1. downlink retransmission method based on time division duplex system in wireless communication, described time division duplex system in wireless communication is used for downlink transfer based on the downstream transmission blocks that will comprise 8 continuous downstream physical frame, to comprise that the uplink transmission block of 4 continuous ascending physical signal frames is used for the time division duplex of uplink, it is characterized in that, described method comprises:

Set in advance the mapping relations of ascending physical signal frame and downstream physical frame group, wherein,

Each downstream physical frame group comprises 2 adjacent downstream physical frame, and a downstream transmission blocks is divided into 4 downstream physical frame groups;

The base station uses the downstream physical frame group of downstream transmission blocks to send one or more data sub-packets to one or more terminals;

The data sub-packets of the downstream physical frame group that described terminal demodulation receives;

Based on demodulation result and described mapping relations, the corresponding ascending physical signal frame of the uplink transmission block of described terminal after described downstream transmission blocks send be used for expression whether successful demodulation the response message of described data sub-packets;

The described response message of described base station demodulation, and whether demodulation is successful to judge described data sub-packets according to described response message, for the downstream physical frame group of data sub-packets demodulation failure, described base station corresponding downstream physical frame group in next downstream transmission blocks sends the data retransmission attached bag of the described data sub-packets of demodulation failure.

2. method according to claim 1, is characterized in that, any or a plurality of downstream physical frame of described base station in described downstream physical frame group sends described one or more data sub-packets.

3. method according to claim 1, is characterized in that, described mapping relations are:

8 continuous downstream physical frame in described downstream transmission blocks are divided into 4 downstream physical frame groups according to the position sequencing, and each downstream physical frame group is corresponding one by one according to sequencing in position with 4 continuous ascending physical signal frames in described uplink transmission block.

4. method according to claim 3, is characterized in that, each ascending physical signal frame is corresponding to the one or more downstream physical frame in the downstream physical frame group that has corresponding relation with it.

5. method according to claim 3, is characterized in that, described method further comprises:

For the downstream physical frame group of data sub-packets demodulation success, described base station corresponding downstream physical frame group in next downstream transmission blocks sends other data sub-packets.

6. method according to claim 3, is characterized in that, described method further comprises:

Set in advance retransmission threshold value, and in the situation that the number of retransmissions of the described data sub-packets of demodulation failure reaches described retransmission threshold value, no longer retransmit.

7. method according to claim 6, is characterized in that, the described data retransmission attached bag that described base station sends for the n time is n level data retransmission attached bag, wherein, and n＜=N,

N is described retransmission threshold value.

8. method according to claim 3, is characterized in that, the operation of described base station data retransmission attached bag of the described data sub-packets of corresponding downstream physical frame group transmission demodulation failure in next downstream transmission blocks is specially:

The position of the downstream physical frame group that described response message is corresponding is determined in described base station according to described mapping relations;

According to the described position of determining, the corresponding downstream physical frame group in described next downstream transmission blocks is determined in described base station, wherein, and the position of corresponding downstream physical frame group in described next downstream transmission blocks and the described position consistency of determining;

Described base station sends described data retransmission attached bag in corresponding downstream physical frame group.

9. method according to claim 3, is characterized in that, described a plurality of data sub-packets send to same terminal, perhaps send to a plurality of terminals.

10. descending retransmission system based on time division duplex system in wireless communication, described time division duplex system in wireless communication is used for downlink transfer based on the downstream transmission blocks that will comprise 8 continuous downstream physical frame, to comprise that the uplink transmission block of continuous 4 ascending physical signal frames is used for the time division duplex of uplink, described descending retransmission system comprises a base station and one or more terminal, it is characterized in that

Described base station comprises:

The downlink transfer unit, be used for using the downstream physical frame group of downstream transmission blocks to send one or more data sub-packets to one or more terminals, wherein, each downstream physical frame group comprises 2 adjacent downstream physical frame, and a downstream transmission blocks is divided into 4 downstream physical frame groups;

The response message demodulating unit is used for receiving the also response message of demodulation terminal transmission, and whether demodulation is successful to judge data sub-packets according to described response message;

Retransmission unit, be used for sending in the specific downstream physical frame group of next downstream transmission blocks the data retransmission attached bag of the data sub-packets of demodulation failure, wherein, the position consistency of described downstream physical frame group in described downstream transmission blocks of the data sub-packets of the position of described specific downstream physical frame group in next downstream transmission blocks and transmission demodulation failure;

Described terminal comprises:

Demodulating unit is used for the data sub-packets of the downstream physical frame group that the described terminal of demodulation receives;

The uplink unit, be used for specified upstream physical frame at uplink transmission block send to described base station be used for expression whether successful demodulation the response message of described data sub-packets, wherein, described specified upstream physical frame is the corresponding ascending physical signal frame of the downstream physical frame group with sending data sub-packets of determining according to predefined ascending physical signal frame and the mapping relations of downstream physical frame group.

11. system according to claim 10, it is characterized in that, the mapping relations of described predefined ascending physical signal frame and downstream physical frame group are: 8 the continuous downstream physical frame in described downstream transmission blocks are divided into 4 downstream physical frame groups according to the position sequencing, and each downstream physical frame group is corresponding one by one according to sequencing in position with 4 continuous ascending physical signal frames in described uplink transmission block.

12. uplink retransmission method based on time division duplex system in wireless communication, described time division duplex system in wireless communication is used for downlink transfer based on the downstream transmission blocks that will comprise 8 continuous downstream physical frame, to comprise that the uplink transmission block of 4 continuous ascending physical signal frames is used for the time division duplex of uplink, it is characterized in that, described method comprises:

Set in advance the mapping relations of ascending physical signal frame and downstream physical frame group, wherein, each downstream physical frame group comprises 2 adjacent downstream physical frame, and a downstream transmission blocks is divided into 4 downstream physical frame groups;

One or more terminals use the ascending physical signal frame of uplink transmission block to send one or more data sub-packets to the base station;

The data sub-packets of the ascending physical signal frame that the demodulation of described base station receives;

Based on demodulation result and described mapping relations, the corresponding downstream physical frame group of the downstream transmission blocks of described base station after described uplink transmission block send be used for expression whether successful demodulation the response message of described data sub-packets;

The described response message of described terminal demodulation, and whether demodulation is successful to judge described data sub-packets according to described response message, for the ascending physical signal frame of data sub-packets demodulation failure, described terminal corresponding ascending physical signal frame in next uplink transmission block sends the data retransmission attached bag of the described data sub-packets of demodulation failure.

13. method according to claim 12 is characterized in that, any or a plurality of downstream physical frame of described base station in described downstream physical frame group sends described response message.

14. method according to claim 12 is characterized in that, described mapping relations are:

15. method according to claim 14 is characterized in that, each ascending physical signal frame is corresponding to the one or more downstream physical frame in the downstream physical frame group that has corresponding relation with it.

16. method according to claim 15 is characterized in that, described method further comprises:

For the ascending physical signal frame of data sub-packets demodulation success, described terminal corresponding ascending physical signal frame in next uplink transmission block sends other data sub-packets.

17. method according to claim 15 is characterized in that, described method further comprises:

18. method according to claim 17 is characterized in that, the described data retransmission attached bag that described terminal sends for the n time is n level data retransmission attached bag, and wherein, n＜=N, N are described retransmission threshold value.

19. method according to claim 15 is characterized in that, the operation of described terminal data retransmission attached bag of the described data sub-packets of corresponding ascending physical signal frame transmission demodulation failure in next uplink transmission block is specially:

Described terminal is determined the position of the ascending physical signal frame that described response message is corresponding according to described mapping relations;

According to the described position of determining, described terminal is determined the corresponding ascending physical signal frame in described next uplink transmission block, wherein, and the position of corresponding ascending physical signal frame in described next uplink and the described position consistency of determining;

Described terminal sends described data retransmission attached bag at corresponding ascending physical signal frame.

20. the uplink retransmission system based on time division duplex system in wireless communication, described time division duplex system in wireless communication is based on the descending biography that will comprise 8 continuous downstream physical frame

Defeated is used for downlink transfer, will comprise that the uplink transmission block of 4 continuous ascending physical signal frames is used for the time division duplex of uplink, and described descending retransmission system comprises a base station and one or more terminal, it is characterized in that,

Described terminal comprises:

The uplink unit is used for using the ascending physical signal frame of uplink transmission block to send one or more data sub-packets to the base station;

The response message demodulating unit is used for receiving the also response message of demodulation base station transmission, and whether demodulation is successful to judge data sub-packets according to described response message;

Retransmission unit, be used for sending at the specified upstream physical frame of next uplink transmission block the data retransmission attached bag of the data sub-packets of demodulation failure, wherein, described specified upstream physical frame is the corresponding ascending physical signal frame of the downstream physical frame group with sending data sub-packets of determining according to predefined ascending physical signal frame and the mapping relations of downstream physical frame group;

Described base station comprises:

Demodulating unit is used for the data sub-packets of the ascending physical signal frame that demodulation described base station receives;

The downlink transfer unit, be used for the specific downstream physical frame group of downstream transmission blocks to described terminal send be used for expression whether successful demodulation the response message of described data sub-packets, wherein, the position consistency of described downstream physical frame group in described downstream transmission blocks of the data sub-packets of the position of described specific downstream physical frame group in next downstream transmission blocks and transmission demodulation failure, each downstream physical frame group comprises 2 adjacent downstream physical frame, and a downstream transmission blocks is divided into 4 downstream physical frame groups.

21. system according to claim 20, it is characterized in that, the mapping relations of described predefined ascending physical signal frame and downstream physical frame group are: 8 the continuous downstream physical frame in described downstream transmission blocks are divided into 4 downstream physical frame groups according to the position sequencing, and each downstream physical frame group is corresponding one by one according to sequencing in position with 4 continuous ascending physical signal frames in described uplink transmission block.