CN101499883B - Uplink/downlink retransmission method and system based on wireless communication time division duplex system - Google Patents
Uplink/downlink retransmission method and system based on wireless communication time division duplex system Download PDFInfo
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Abstract
The invention discloses a downstream data retransmitting method, which comprises the following steps: a mapping relationship between an upstream physical frame and a downstream physical frame is preliminarily configured; a base station sends one or more data sub-packages to one or more terminals by using the downstream physical frame of downstream transmission blocks; the terminal demodulates the received data sub-packages of the downstream physical frame; 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 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 of the downstream transmission blocks. The invention further provides a downstream data retransmitting system, an upstream data retransmitting method and an upstream data retransmitting system.
Description
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, referred to as TDD) system.
Background technology
Carry out in the wireless system of transfer of data as unit take superframe (superframe), the Uplink/Downlink of radio open transmission generally be take superframe and is transmitted data 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).
Current 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) system has two kinds of duplex modes,, 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 up/down row is distributed relatively independent.
The TDD mode is that Uplink/Downlink is used identical frequency range timesharing to be transmitted, and this mode need to be divided into PHY frame the uplink and downlink timesharing and be transmitted.
Under the TDD1:1 mode, uplink/downlink PHY frame generally can transmit according to following mode: base station and terminal be take superframe and are carried out transfer of data as unit, in the duration of a superframe, at first base station sends leading to terminal, then the downstream transmission blocks formed by 6 continuous downstream physical frame sends downlink data to terminal, afterwards, on very first time interval, base station and terminal do not send data, next, the upstream data that the uplink transmission block that the base station receiving terminal forms by 6 continuous ascending physical signal frames sends, afterwards, on second time interval, base station and terminal do not send data, then, another downstream transmission blocks that base station forms by 6 continuous downstream physical frame again sends downlink data to terminal, then, on the 3rd time interval, base station and terminal do not send data, then, the upstream data that base station another uplink transmission block that receiving terminal forms by 6 continuous ascending physical signal frames again sends.
In realizing process of the present invention, the inventor finds, in the transmission method of the upstream or downstream data under above-mentioned TDD1:1 mode, does not all provide the re-transmission solution of upstream data or downlink data, and want the correct sending and receiving that completes data, retransmission mechanism is obvious and requisite.Therefore, need a kind of technical scheme that can make up this defect.
Summary of the invention
Consider in the data upstream transmission under the TDD1:1 mode that exists in correlation technique or downlink transmission process and need a kind of problem of data re-transmission mechanism and propose 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 and system based on tdd systems is provided, make up the above-mentioned defect 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, the downstream transmission blocks of above-mentioned time division duplex system in wireless communication based on comprising 6 continuous downstream physical frame, for downlink transfer, will comprise the time division duplex of the uplink transmission block of 6 continuous ascending physical signal frames for 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; Base station is used the downstream physical frame 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 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 sends for the response message of data sub-packets that meaned whether successful demodulation; Base station demodulation response message, and whether demodulation is successful to judge data sub-packets according to response message, for the downstream physical frame of data sub-packets demodulation failure, base station corresponding downstream physical frame in next downstream transmission blocks sends the data retransmission attached bag of the data sub-packets of demodulation failure.
Wherein, above-mentioned mapping relations are: 6 the continuous downstream physical frame in downstream transmission blocks are corresponding one by one according to sequencing in position with 6 the continuous ascending physical signal frames in uplink transmission block.
In addition, said method also comprises following processing: for the downstream physical frame of data sub-packets demodulation success, base station corresponding downstream physical frame 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 retransmitted.Wherein, the data retransmission attached bag that base station sends for the n time is n level data retransmission attached bag, wherein, n<=N, N is retransmission threshold value.
Preferably, the operation of base station data retransmission attached bag of the data sub-packets of corresponding downstream physical frame transmission demodulation failure in next downstream transmission blocks is specially: the position of base station corresponding downstream physical frame according to mapping relations definite response message; According to definite position, the corresponding downstream physical frame in next downstream transmission blocks is determined in base station, wherein, and the corresponding position of downstream physical frame in next downlink transfer and definite position consistency; Base station sends retransmission data packet may in corresponding downstream physical frame.
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, the downstream transmission blocks of above-mentioned time division duplex system in wireless communication based on comprising 6 continuous downstream physical frame is for downlink transfer, to comprise the time division duplex of the uplink transmission block of 6 continuous ascending physical signal frames for 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, base station comprises: the downlink transfer unit sends one or more data sub-packets for the downstream physical frame of using downstream transmission blocks to one or more terminals; The response message demodulating unit, for the response message received and the demodulation terminal sends, and whether demodulation is successful to judge data sub-packets according to response message; Retransmission unit, for sending the data retransmission attached bag of the data sub-packets of demodulation failure in the specific downstream physical frame of next downstream transmission blocks; Terminal comprises: demodulating unit, the data sub-packets of the downstream physical frame received for the demodulation terminal; The uplink unit, send to base station for the specified upstream physical frame at uplink transmission block for the response message of data sub-packets that meaned whether successful demodulation.
Wherein, above-mentioned specified upstream physical frame is the corresponding ascending physical signal frame of the downstream physical frame with sending data sub-packets of determining according to predefined mapping relations, wherein, mapping relations are: 6 the continuous downstream physical frame in downstream transmission blocks are corresponding one by one according to sequencing in position with 6 the continuous ascending physical signal frames in uplink transmission block.
In addition, the position consistency of downstream physical frame in downstream transmission blocks of the data sub-packets of the position of above-mentioned specific downstream physical frame 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, the downstream transmission blocks of above-mentioned time division duplex system in wireless communication based on comprising 6 continuous downstream physical frame, for downlink transfer, will comprise the time division duplex of the uplink transmission block of 6 continuous ascending physical signal frames for 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; One or more terminals are used the ascending physical signal frame of uplink transmission block to send one or more data sub-packets to 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 of the downstream transmission blocks of base station after uplink transmission block sends for the response message of data sub-packets that meaned whether successful demodulation; 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.
Wherein, above-mentioned mapping relations are: 6 the continuous downstream physical frame in downstream transmission blocks are corresponding one by one according to sequencing in position with 6 the continuous ascending physical signal frames in uplink transmission block.
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 retransmitted.Wherein, the data retransmission attached bag that terminal sends for the n time is n level data retransmission attached bag, wherein, n<=N, N is 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 terminal corresponding firm's physical frame according to above-mentioned mapping relations definite response message; According to definite position, terminal is determined the corresponding ascending physical signal frame in next uplink transmission block, wherein, and the above-mentioned position of corresponding ascending physical signal frame in next uplink and definite position consistency; 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, the downstream transmission blocks of above-mentioned time division duplex system in wireless communication based on comprising 6 continuous downstream physical frame, for downlink transfer, will comprise the time division duplex of the uplink transmission block of 6 continuous ascending physical signal frames for 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 sends one or more data sub-packets for the ascending physical signal frame that uses uplink transmission block to base station; The response message demodulating unit, for the response message received and the demodulation base station sends, and whether demodulation is successful to judge data sub-packets according to response message; Retransmission unit, send the data retransmission attached bag of the data sub-packets of demodulation failure for the specified upstream physical frame at next uplink transmission block; Base station comprises: demodulating unit, the data sub-packets of the ascending physical signal frame received for the demodulation base station; The downlink transfer unit, send for the response message of data sub-packets that meaned whether successful demodulation to terminal for the specific downstream physical frame in downstream transmission blocks.
Wherein, above-mentioned specific downstream physical frame 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: 6 the continuous downstream physical frame in downstream transmission blocks are corresponding one by one according to sequencing in position with 6 the 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 TDD1:1 mode, by in downlink transfer, in the uplink transmission block transmission, replying symbol, perhaps in uplink, in the downstream transmission blocks transmission, reply symbol, realize the re-transmission of data, thereby made up the defect 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 from specification, become apparent, or 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 write, claims and accompanying drawing.
The accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms the part of specification, for explaining the present invention, is not construed as limiting the invention together with embodiments of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the downlink retransmission method based on the TDD system of the embodiment of the present invention;
Fig. 2 (a) and Fig. 2 (b) are the schematic diagrames of the example 1 of the method shown in Fig. 1;
Fig. 3 is the structured flowchart according to the descending retransmission system based on the TDD system of the embodiment of the present invention;
Fig. 4 is the flow chart according to the uplink retransmission method based on the TDD system of the embodiment of the present invention;
Fig. 5 (a) and Fig. 5 (b) are the schematic diagrames of the example 2 of the method shown in Fig. 5;
Fig. 6 is the structured flowchart according to the uplink retransmission system based on the TDD system of 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 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 TDD1:1 mode, the embodiment of the present invention provides a kind of downlink retransmission method based on wireless communications tdd system, the downstream transmission blocks of above-mentioned wireless communications tdd system based on comprising 6 continuous downstream physical frame is for downlink transfer, to comprise the TDD mode (that is, TDD1:1 mode) of the uplink transmission block of 6 continuous ascending physical signal frames for uplink.
Fig. 1 is the flow chart according to the downlink retransmission method based on wireless communications tdd system of the embodiment of the present invention.As shown in Figure 1, the method comprises following processing:
Step S102, set in advance the mapping relations of ascending physical signal frame and downstream physical frame;
Step S104, base station is used the downstream physical frame 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 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 sends for the response message of data sub-packets that meaned whether successful demodulation;
Step S110, 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 of data sub-packets demodulation failure, base station corresponding downstream physical frame 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: 6 the continuous downstream physical frame in downstream transmission blocks are corresponding one by one according to sequencing in position with 6 the continuous ascending physical signal frames in uplink transmission block.That is, the 1st downstream physical frame in downstream transmission blocks be corresponding to the 1st ascending physical signal frame in uplink transmission block, and in like manner, the 2nd 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 S104
For example, in the unit of transfer of a superframe, the downstream transmission blocks that base station forms by 6 continuous downstream physical frame sends downlink data to terminal, in order to set forth conveniently, the data sub-packets sent for these 6 downlink physical frame position, be defined as respectively P0, P1, P2, P3, P4, P5, that is to say, the data sub-packets sent at first physical frame of downstream transmission blocks is defined as P0, other the like.The data sub-packets of these 6 diverse locations can be issued a 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 starts transmission from first downstream transmission blocks of superframe, and supposes that 6 positions have all transmitted data sub-packets, and 6 data attached bags send to same terminal.
(3) step S106 and step S108
The terminal demodulation after the data sub-packets of these 6 diverse locations, send respectively ACK or NACK message on the uplink transmission block that will form at ensuing 6 continuous ascending physical signal frames.ACK means terminal success demodulating data, and NACK means that terminal does not have successful demodulating data.According to the mapping relations that arrange in step S102, the ACK/NACK message of these 6 diverse locations is distinguished corresponding P0 successively, P1, P2, P3, P4, the data sub-packets of these 6 diverse locations of P5.
(4) step S110
In this step, the base station operation that corresponding downstream physical frame sends the data retransmission attached bag in next downstream transmission blocks is specially: the position of base station corresponding downstream physical frame according to mapping relations definite response message (ACK/NACK); According to definite position, the corresponding downstream physical frame in next downstream transmission blocks is determined in base station, wherein, and the corresponding position of downstream physical frame in next downlink transfer and definite position consistency; Afterwards, base station sends retransmission data packet may in corresponding downstream physical frame.
Particularly, base station is the ACK/NACK message of these 6 diverse locations of demodulation at first, if NACK message, mean that terminal does not have successful demodulating data, send first order data retransmission attached bag on the respective channel resource of corresponding downlink physical frame position on the downstream transmission blocks (that is, next downstream transmission blocks) that base station forms in ensuing 6 continuous downstream physical frame.It should be noted that, the data retransmission attached bag can be identical with the data sub-packets of original transmission, 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 in next downstream transmission blocks sends other data sub-packets.; if ACK message; mean terminal success demodulating data, on the downstream transmission blocks that base station forms in ensuing 6 continuous downstream physical frame, corresponding physical frame position 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 retransmitted.Wherein, the data retransmission attached bag that base station sends for the n time is n level data retransmission attached bag, wherein, n<=N, N is retransmission threshold value.
Based on foregoing, next, if the correct demodulation of terminal after first order data retransmission attached bag, physical frame position corresponding on the uplink transmission block formed at ensuing 6 continuous ascending physical signal frames sends ACK message; If terminal does not have correct demodulation first order data retransmission attached bag, on the uplink transmission block formed at ensuing 6 continuous ascending physical signal frames, corresponding physical frame position sends NACK message.
Afterwards, the ACK/NACK message of these 6 diverse locations of base station demodulation, if ACK message, mean terminal success demodulating data, on the downstream transmission blocks that base station forms in ensuing 6 continuous downstream physical frame, physical frame position corresponding to (downstream transmission blocks at this moment should be first downstream transmission blocks in ensuing another superframe, and the border of superframe is unrestricted) sends other data sub-packets; If NACK message means that terminal does not still have successful demodulating data, on the downstream transmission blocks that base station forms in above-mentioned ensuing 6 continuous downstream physical frame, on the respective channel resource of corresponding physical frame position, send second level data retransmission attached bag.
That is to say, as long as the correct demodulation downlink data of terminal attached bag just sends ACK message in corresponding ascending physical signal frame position, base station receives ACK message, just in corresponding downlink physical frame position, sends other data sub-packets; As long as terminal does not have correct demodulation downlink data attached bag, just in corresponding ascending physical signal frame position, send NACK message, base station receives NACK message, just on the respective channel resource of corresponding downlink physical frame position, need to send N level data retransmission attached bag, usually, can by retransmission threshold value N be set to 5, can be also other positive integer.
Example 1
In the unit of transfer of a superframe, the downstream transmission blocks that base station forms by 6 continuous downstream physical frame sends downlink data to terminal, and the data sub-packets sent for these 6 downlink physical frame position, be defined as respectively P0, P1, P2, P3, P4, P5, that is, the data sub-packets sent at first physical frame of downstream transmission blocks is defined as P0, and the data sub-packets of second physical frame 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.
The transmission data sub-packets P0 of take is example, and P0 is in the upper transmission of descending first physical frame F0 shown in Fig. 2 (a).
If the correct demodulation P0 of terminal, send ACK message in the position of R0, as shown in Fig. 2 (a), after base station receives ACK message, at first physical frame of ensuing downstream transmission blocks, is also that the position of F6 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, in the position of R0, send NACK message, as shown in Fig. 2 (b), after base station receives NACK message, at first physical frame of ensuing downstream transmission blocks, be also to send first order data retransmission attached bag R1P0 on the respective channel resource of F6 position.
If the correct demodulation of terminal after first order data retransmission attached bag, in the position of R6, send ACK message; After base station receives ACK message, in the position of first physical frame 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), send other data sub-packets P ' 0.
If terminal does not have correct demodulation first order data retransmission attached bag, in the position of R6, send NACK message.After base station receives NACK message, on the respective channel resource of first physical frame 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), send second level data retransmission attached bag R2P0.
As long as the correct demodulation downlink data of terminal attached bag, just send ACK message in corresponding ascending physical signal frame position, base station receives ACK message, just in corresponding downlink physical frame position, sends other data sub-packets; As long as terminal does not have correct demodulation downlink data attached bag, just in corresponding ascending physical signal frame position, send NACK message, base station receives NACK message, just on the respective channel resource of corresponding downlink physical frame position, need to send N level data retransmission attached bag, usually, can by retransmission threshold value N be set to 5, can be also 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, the downstream transmission blocks of above-mentioned wireless communications tdd system based on comprising 6 continuous downstream physical frame is for downlink transfer, to comprise the TDD mode (that is, TDD1:1 mode) of the uplink transmission block of 6 continuous ascending physical signal frames for 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, 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 sends one or more data sub-packets for the downstream physical frame of using downstream transmission blocks to one or more terminals; Response message demodulating unit 304 is for the response message received and the demodulation terminal sends, and whether demodulation is successful to judge data sub-packets according to response message; Retransmission unit 306 is for sending the data retransmission attached bag of the data sub-packets of demodulation failure in the specific downstream physical frame of next downstream transmission blocks.
Demodulating unit 308, be connected to downlink transfer unit 302 and retransmission unit 306, the data sub-packets of the downstream physical frame received for the demodulation terminal; Uplink unit 310 can be connected to demodulating unit 308 and response message demodulating unit 304, for the specified upstream physical frame at uplink transmission block, to base station, sends for the response message of data sub-packets that meaned whether successful demodulation.
Wherein, above-mentioned specified upstream physical frame is the corresponding ascending physical signal frame of the downstream physical frame with sending data sub-packets of determining according to predefined mapping relations, wherein, mapping relations are: 6 the continuous downstream physical frame in downstream transmission blocks are corresponding one by one according to sequencing in position with 6 the continuous ascending physical signal frames in uplink transmission block.
In addition, the position consistency of downstream physical frame in downstream transmission blocks of the data sub-packets of the position of above-mentioned specific downstream physical frame in next downstream transmission blocks and transmission demodulation failure.
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, at this, no longer are repeated in this description.
By top description, can find out, the technical scheme provided by means of embodiment of the method one or system embodiment one, in downlink data transmission, by making terminal send response message on corresponding ascending physical signal frame, 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, the downstream transmission blocks of above-mentioned wireless communications tdd system based on comprising 6 continuous downstream physical frame, for downlink transfer, will comprise the TDD mode of the uplink transmission block of 6 continuous ascending physical signal frames for uplink.
As shown in Figure 4, comprise following processing according to the uplink retransmission method of the embodiment of the present invention:
Step S402, set in advance the mapping relations of ascending physical signal frame and downstream physical frame;
Step S404, one or more terminals are used the ascending physical signal frame of uplink transmission block to send one or more data sub-packets to 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 of the downstream transmission blocks of base station after uplink transmission block sends for the response message of data sub-packets that meaned whether successful demodulation;
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.
Below will further describe the details in each step of above-mentioned processing.
(1) step S402
The mapping relations of mentioning in this step are: 6 the continuous downstream physical frame in downstream transmission blocks are corresponding one by one according to sequencing in position with 6 the continuous ascending physical signal frames in uplink transmission block.That is, the 1st downstream physical frame in downstream transmission blocks be corresponding to the 1st ascending physical signal frame in uplink transmission block, and in like manner, the 2nd 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, the uplink transmission block that terminal forms by 6 continuous ascending physical signal frames sends upstream data to base station, in order to set forth conveniently, the data sub-packets sent for these 6 ascending physical signal frame position, be defined as respectively P0, P1, P2, P3, P4, P5, that is to say, the data sub-packets sent at first physical frame of uplink transmission block is defined as P0, other the like.The data sub-packets of these 6 diverse locations can send to base station by a terminal, also can send to 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 starts transmission from first uplink transmission block of superframe, and supposes that 6 positions have all transmitted data sub-packets, and 6 data attached bags send to base station by same terminal.
(3) step S406 and step S408
The base station demodulation after the data sub-packets of these 6 diverse locations, send respectively ACK or NACK message on the downstream transmission blocks that will form in ensuing 6 continuous downstream physical frame.ACK means base station success demodulating data, and NACK means that base station does not have successful demodulating data.According to the mapping relations that arrange in step S102, the ACK/NACK message of these 6 diverse locations is distinguished corresponding P0 successively, P1, P2, P3, P4, the data sub-packets of these 6 diverse locations of P5.
(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: the position of terminal corresponding ascending physical signal frame according to mapping relations definite response message (ACK/NACK); According to definite position, terminal is determined the corresponding ascending physical signal frame in next uplink transmission block, wherein, and the corresponding position of ascending physical signal frame in next uplink and definite position consistency; Afterwards, terminal sends retransmission data packet may at corresponding ascending physical signal frame.
Particularly, terminal is the ACK/NACK message of these 6 diverse locations of demodulation at first, if NACK message, mean that base station does not have successful demodulating data, send first order data retransmission attached bag on the respective channel resource of corresponding ascending physical signal frame position on the uplink transmission block (that is, next uplink transmission block) that terminal forms at ensuing 6 continuous ascending physical signal frames.It should be noted that, the data retransmission attached bag can be identical with the data sub-packets of original transmission, 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.; if ACK message; mean base station success demodulating data, on the uplink transmission block that terminal forms at ensuing 6 continuous ascending physical signal frames, corresponding physical frame position 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 retransmitted.Wherein, the data retransmission attached bag that terminal sends for the n time is n level data retransmission attached bag, wherein, n<=N, N is retransmission threshold value.
Based on foregoing, next, if the correct demodulation in base station after first order data retransmission attached bag, physical frame position corresponding on the downstream transmission blocks formed in ensuing 6 continuous downstream physical frame sends ACK message; If base station does not have correct demodulation first order data retransmission attached bag, on the downstream transmission blocks formed in ensuing 6 continuous downstream physical frame, corresponding physical frame position sends NACK message.
Afterwards, the ACK/NACK message of these 6 diverse locations of terminal demodulation, if ACK message, mean base station success demodulating data, on the uplink transmission block that terminal forms at ensuing 6 continuous ascending physical signal frames, physical 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) sends other data sub-packets; If NACK message means that base station does not still have successful demodulating data, on the uplink transmission block that terminal forms at above-mentioned ensuing 6 continuous ascending physical signal frames, on the respective channel resource of corresponding physical frame position, send second level data retransmission attached bag.
That is to say, as long as base station correct demodulation downlink data attached bag just sends ACK message in corresponding downlink physical frame position, terminal receives ACK message, just in corresponding ascending physical signal frame position, sends other data sub-packets; As long as base station does not have correct demodulation upstream data attached bag, just in corresponding downlink physical frame position, send NACK message, terminal receives NACK message, just on the respective channel resource of corresponding ascending physical signal frame position, need to send N level data retransmission attached bag, usually, can by retransmission threshold value N be set to 5, can be also other positive integer.
Example 2
In the unit of transfer of a superframe, the uplink transmission block that terminal forms by 6 continuous ascending physical signal frames sends upstream data to base station, and the data sub-packets sent for these 6 ascending physical signal frame position, be defined as respectively P0, P1, P2, P3, P4, P5, that is, the data sub-packets sent 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.
The transmission data sub-packets P0 of take is example, and P0 is in the upper transmission of the R0 of up first physical frame of moral shown in Fig. 5 (a).
If the correct demodulation P0 in base station, send ACK message in the position of F6, as shown in Fig. 5 (a), after terminal receives ACK message, at first physical frame of ensuing uplink transmission block, is also that the position of R6 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 base station does not have correct demodulation P0, in the position of F6, send NACK message, as shown in Fig. 5 (b), after terminal receives NACK message, on being also the respective channel resource of R6 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 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), send ACK message; After terminal receives ACK message, 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), send other data sub-packets P ' 0.
If base station does not have correct demodulation first order data retransmission attached bag, in first physical frame 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), send NACK message; After terminal receives NACK message, 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), send second level data retransmission attached bag R2P0.
In like manner, as long as base station correct demodulation downlink data attached bag just sends ACK message in corresponding physical frame position, terminal receives ACK message, just in corresponding physical frame position, sends other data sub-packets; As long as base station does not have correct demodulation downlink data attached bag, just in corresponding physical frame position, send NACK message, terminal receives NACK message, just on the respective channel resource of corresponding physical frame position, need to send N level data retransmission attached bag, usually, can by retransmission threshold value N be set to 5, can be also other positive integer.
By that analogy, for P1, P2, P3, P4, the HARQ retransmission processing method of P5 data sub-packets is identical, different with data sub-packets P0's, in downstream transmission blocks and uplink transmission block, corresponds respectively to second to the 6th 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, the downstream transmission blocks of above-mentioned wireless communications tdd system based on comprising 6 continuous downstream physical frame is for downlink transfer, to comprise the TDD mode (that is, TDD1:1 mode) of the uplink transmission block of 6 continuous ascending physical signal frames for 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, base station comprises: demodulating unit 608, downlink transfer unit 610.
Particularly, uplink unit 602 sends one or more data sub-packets for the ascending physical signal frame that uses uplink transmission block to base station; Response message demodulating unit 604 is for the response message received and the demodulation base station sends, and whether demodulation is successful to judge data sub-packets according to response message; Retransmission unit 606 sends the data retransmission attached bag of the data sub-packets of demodulation failure for the specified upstream physical frame at next uplink transmission block.
Demodulating unit 608, be connected to uplink unit 602 and retransmission unit 606, the data sub-packets of the ascending physical signal frame received for the demodulation base station; Downlink transfer unit 610 can be connected to demodulating unit 608 and response message demodulating unit 604, for the specific downstream physical frame in downstream transmission blocks, to terminal, sends for the response message of data sub-packets that meaned whether successful demodulation.
Wherein, above-mentioned specific downstream physical frame 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: 6 the continuous downstream physical frame in downstream transmission blocks are corresponding one by one according to sequencing in position with 6 the 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, at this, no longer are repeated in this description.
By top description, can find out, the technical scheme provided by means of embodiment of the method two or system embodiment two, in transmitting uplink data, by making base station send response message on corresponding downstream physical 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 provided by the embodiment of the present invention, under the TDD1:1 mode, in downlink transfer, reply symbol by the corresponding ascending physical signal frame transmission in uplink transmission block, or, in uplink, by the corresponding downstream physical frame transmission in downstream transmission blocks, reply symbol, realize the re-transmission of data, thereby made up the defect that lacks a kind of retransmission mechanism in the correlation technique.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, 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 (16)
1. the downlink retransmission method based on time division duplex system in wireless communication, the downstream transmission blocks of described time division duplex system in wireless communication based on comprising 6 continuous downstream physical frame is for downlink transfer, to comprise the time division duplex of the uplink transmission block of 6 continuous ascending physical signal frames for uplink, it is characterized in that, described method comprises:
Set in advance the mapping relations of ascending physical signal frame and downstream physical frame;
Base station is used the downstream physical frame 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 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 sends for the response message of described data sub-packets that meaned whether successful demodulation, wherein, described corresponding ascending physical signal frame is the corresponding ascending physical signal frame of the downstream physical frame with sending described data sub-packets of determining according to the described mapping relations that set in advance;
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, downstream physical frame for data sub-packets demodulation failure, described base station corresponding downstream physical frame in next downstream transmission blocks sends the data retransmission attached bag of the described data sub-packets of demodulation failure, wherein, the position consistency of described downstream physical frame in described downstream transmission blocks of the described data sub-packets of the position of corresponding downstream physical frame in described next downstream transmission blocks and transmission demodulation failure.
2. method according to claim 1, is characterized in that, described mapping relations are: 6 the continuous downstream physical frame in described downstream transmission blocks are corresponding one by one according to sequencing in position with 6 the continuous ascending physical signal frames in described uplink transmission block.
3. method according to claim 2, is characterized in that, described method further comprises:
For the downstream physical frame of data sub-packets demodulation success, described base station corresponding downstream physical frame in next downstream transmission blocks sends other data sub-packets.
4. method according to claim 2, 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 retransmitted.
5. method according to claim 4, 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, n<=N, N is described retransmission threshold value.
6. method according to claim 2, 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 transmission demodulation failure in next downstream transmission blocks is specially:
The position of the downstream physical frame 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 in described next downstream transmission blocks is determined in described base station, wherein, and the position of corresponding downstream physical frame 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.
7. the descending retransmission system based on time division duplex system in wireless communication, the downstream transmission blocks of described time division duplex system in wireless communication based on comprising 6 continuous downstream physical frame is for downlink transfer, to comprise the time division duplex of the uplink transmission block of 6 continuous ascending physical signal frames for 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, send one or more data sub-packets for the downstream physical frame of using downstream transmission blocks to one or more terminals;
The response message demodulating unit, for the response message received and the demodulation terminal sends, and whether demodulation is successful to judge data sub-packets according to described response message;
Retransmission unit, for send the data retransmission attached bag of the data sub-packets of demodulation failure in the corresponding downstream physical frame of next downstream transmission blocks, wherein, the position consistency of described downstream physical frame in described downstream transmission blocks of the described data sub-packets of the position of corresponding downstream physical frame in described next downstream transmission blocks and transmission demodulation failure;
Described terminal comprises:
Demodulating unit, the data sub-packets of the downstream physical frame received for the described terminal of demodulation;
The uplink unit, for the corresponding ascending physical signal frame of uplink transmission block described downstream transmission blocks after to described base station, send for expression whether successful demodulation the response message of described data sub-packets, wherein, described corresponding ascending physical signal frame is the corresponding ascending physical signal frame of the downstream physical frame with sending described data sub-packets of determining according to predefined mapping relations.
8. system according to claim 7, is characterized in that, described mapping relations are: 6 the continuous downstream physical frame in described downstream transmission blocks are corresponding one by one according to sequencing in position with 6 the continuous ascending physical signal frames in described uplink transmission block.
9. the uplink retransmission method based on time division duplex system in wireless communication, the downstream transmission blocks of described time division duplex system in wireless communication based on comprising 6 continuous downstream physical frame is for downlink transfer, to comprise the time division duplex of the uplink transmission block of 6 continuous ascending physical signal frames for uplink, it is characterized in that, described method comprises:
Set in advance the mapping relations of ascending physical signal frame and downstream physical frame;
One or more terminals are used the ascending physical signal frame of uplink transmission block to send one or more data sub-packets to 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 of the downstream transmission blocks of described base station after described uplink transmission block sends for the response message of described data sub-packets that meaned whether successful demodulation, wherein, described corresponding downstream physical frame is the corresponding downstream physical frame of the ascending physical signal frame with sending described data sub-packets of determining according to the described mapping relations that set in advance;
The described response message of described terminal demodulation, and whether demodulation is successful to judge described data sub-packets according to described response message, ascending physical signal frame for 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, wherein, the position consistency of described ascending physical signal frame in described uplink transmission block of the described data sub-packets of the position of corresponding ascending physical signal frame in described next uplink transmission block and transmission demodulation failure.
10. method according to claim 9, it is characterized in that, described mapping relations are: 6 the continuous downstream physical frame in described downstream transmission blocks are corresponding one by one according to sequencing in position with 6 the continuous ascending physical signal frames in described uplink transmission block.
11. method according to claim 10, 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.
12. method according to claim 10, 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 retransmitted.
13. method according to claim 12, 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, wherein, n<=N, N is described retransmission threshold value.
14. method according to claim 10, 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.
15. the uplink retransmission system based on time division duplex system in wireless communication, the downstream transmission blocks of described time division duplex system in wireless communication based on comprising 6 continuous downstream physical frame is for downlink transfer, to comprise the time division duplex of the uplink transmission block of 6 continuous ascending physical signal frames for uplink, described descending retransmission system comprises a base station and one or more terminal, it is characterized in that
Described terminal comprises:
The uplink unit, send one or more data sub-packets for the ascending physical signal frame that uses uplink transmission block to base station;
The response message demodulating unit, for the response message received and the demodulation base station sends, and whether demodulation is successful to judge data sub-packets according to described response message;
Retransmission unit, for send the data retransmission attached bag of the data sub-packets of demodulation failure at the corresponding ascending physical signal frame of next uplink transmission block, wherein, the position consistency of described ascending physical signal frame in described uplink transmission block of the described data sub-packets of the position of corresponding ascending physical signal frame in described next uplink transmission block and transmission demodulation failure;
Described base station comprises:
Demodulating unit, the data sub-packets of the ascending physical signal frame received for the described base station of demodulation;
The downlink transfer unit, for the corresponding downstream physical frame of downstream transmission blocks described uplink transmission block after to described terminal send for expression whether successful demodulation the response message of described data sub-packets, wherein, described corresponding downstream physical frame is the corresponding downstream physical frame of the ascending physical signal frame with sending described data sub-packets of determining according to predefined mapping relations.
16. system according to claim 15, it is characterized in that, described mapping relations are: 6 the continuous downstream physical frame in described downstream transmission blocks are corresponding one by one according to sequencing in position with 6 the continuous ascending physical signal frames in described uplink transmission block.
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| CN1394406A (en) * | 2000-10-21 | 2003-01-29 | 三星电子株式会社 | Data transmitting/receiving method in HARQ data communication system |
| CN1689261A (en) * | 2002-08-13 | 2005-10-26 | 松下电器产业株式会社 | Method of process configuration for multiple HARQ processes |
| CN1930816A (en) * | 2004-03-12 | 2007-03-14 | 三星电子株式会社 | Method for operation of HARQ in a broadband wireless access communication system |
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| CN1394406A (en) * | 2000-10-21 | 2003-01-29 | 三星电子株式会社 | Data transmitting/receiving method in HARQ data communication system |
| CN1689261A (en) * | 2002-08-13 | 2005-10-26 | 松下电器产业株式会社 | Method of process configuration for multiple HARQ processes |
| CN1930816A (en) * | 2004-03-12 | 2007-03-14 | 三星电子株式会社 | Method for operation of HARQ in a broadband wireless access communication system |
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