CN101547039B - Uplink/downlink retransmission method based on wireless communication time division duplexing system - Google Patents
Uplink/downlink retransmission method based on wireless communication time division duplexing system Download PDFInfo
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Abstract
The invention discloses an uplink/downlink data retransmission method, wherein a downlink retransmission method comprises the following treatments that: a mapping relationship between uplink physical frames and downlink physical frames is preset so as to make the first three downlink physical frames in a downlink transmission block correspond to a first physical frame in an uplink transmission block and make the last three downlink physical frames in the downlink transmission block correspond to a second physical frame in the uplink transmission block; a base station uses the downlink physical frames in the downlink transmission block to send one or more data sub-packages to one or more terminals; the terminals demodulate the received data sub-packages; based on the demodulation results and according to the preset mapping relationship, the terminals send reply messages in the corresponding uplink physical frames in the uplink transmission block after the downlink transmission block; the base station demodulates the reply messages and judges whether the data sub-packages are successfully demodulated or not according to the reply messages; and regarding the data sub-packages failing to be demodulated, the base station sends the retransmitted data sub-packages in the corresponding downlink physical frames in a subsequent downlink transmission block.
Description
Technical field
The present invention relates to wireless communication system, particularly, relate to up/descending repeating method based on radio communication time division duplex (Time Division Duplex abbreviates TDD as) system.
Background technology
Be that unit carries out in the wireless system of transfer of data with superframe (superframe), the Uplink/Downlink of radio open transmission generally is that unit transmits data with superframe; Each superframe is made up of a preamble (leading) and several PHY Frame (physical frame); Preamble and PHY Frame are made up of for base unit OFDM (OrthogonalFrequency Division Multiplexing, OFDM) Symbol (symbol).
Present UMB (Ultra Mobile Broadband; Super mobile broadband), all there are two kinds of duplex modes in LTE (Long-Term Evolution, Long Term Evolution), Wimax (WorldwideInteroperability for Microwave Access, micro-wave access to global intercommunication) system; Promptly; FDD (Frequency Division Duplex, FDD mode) and TDD (Time Division Duplex, time division duplex) mode.
The FDD mode is that Uplink/Downlink adopts different frequency band transmission, like this, and in the system/resource allocation of descending PHY Frames is relatively independent.
The TDD mode is that Uplink/Downlink uses identical frequency range timesharing to transmit, and this mode need be divided into the uplink and downlink timesharing with PHY frame and transmit.
Under the TDD6:2 mode, up/descending PHY frame generally can transmit according to following mode: base station and terminal are that unit carries out transfer of data with the superframe, in the duration of a superframe; The base station is at first sent leading to the terminal, the downstream transmission blocks of forming through 6 continuous downstream physical frame is then sent downlink data to the terminal, afterwards; Data are not sent at base station and terminal on very first time interval, next, and the upstream data that the uplink transmission block that the base station receiving terminal is formed through 2 continuous ascending physical signal frames sends; Afterwards; Data are not sent at base station and terminal on second time interval, and then, the base station is sent downlink data through another downstream transmission blocks that 6 continuous downstream physical frame are formed to the terminal again; Then; Data are not sent at base station and terminal on the 3rd time interval, and then, the base station is the upstream data that sends of another uplink transmission block of forming through 2 continuous ascending physical signal frames of receiving terminal again; On the 4th time interval; Data are not sent at base station and terminal; The base station is sent downlink data through another downstream transmission blocks that 6 continuous downstream physical frame are formed to the terminal more then; Data are not sent at base station and terminal on the 5th time interval, and then, the base station is the upstream data that sends of another uplink transmission block of forming through 2 continuous ascending physical signal frames of receiving terminal again.
Inventor of the present invention finds in implementation process; In the transmission method of the upstream or downstream data under the above-mentioned TDD6:2 mode; All do not provide the re-transmission solution of upstream data or downlink data, and the transmission and the reception of completion data that will be correct, retransmission mechanism is obvious and requisite.Therefore, need a kind of technical scheme that can remedy this defective.
Summary of the invention
Consider the problem of a kind of data re-transmission mechanism of needs in the data upstream transmission under the TDD6:2 mode that exists in the correlation technique or the downlink transmission process 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 descending repeating method and system based on tdd systems is provided, remedy the above-mentioned defective in the correlation technique to realize a kind of retransmission mechanism.
According to an aspect of the present invention; A kind of descending repeating 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 6 continuous downstream physical frame, will comprise that the uplink transmission block of 2 continuous ascending physical signal frames is used for the time division duplex of uplink.
Descending repeating method according to the embodiment of the invention comprises following processing: the mapping relations that ascending physical signal frame and downstream physical frame are set in advance; Make that first three downstream physical frame in the downstream transmission blocks is corresponding with first physical frame in the uplink transmission block, back three downstream physical frame in the downstream transmission blocks are corresponding with second physical frame in the uplink transmission block; The base station uses 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 that terminal demodulates receives; Based on demodulation result, the terminal is according to the mapping relations that are provided with in advance, the response message of data sub-packets that the corresponding ascending physical signal frame transmission of the uplink transmission block downstream transmission blocks after has been used to represent whether successful demodulation; The base station demodulates response message, and wrap whether demodulation success according to response message judgment data, for the data sub-packets of demodulation failure, base station corresponding downstream physical frame in next downstream transmission blocks sends data retransmission bag.
Wherein, for the data sub-packets that the one or more physical frames in first three downstream physical frame of using downstream transmission blocks send, first ascending physical signal frame of first uplink transmission block of terminal after ascending physical signal frame downstream transmission blocks sends response message; For the data sub-packets that the one or more physical frames in back three downstream physical frame of using downstream transmission blocks send, second ascending physical signal frame of second uplink transmission block of terminal after downstream transmission blocks sends response message; And second downstream transmission blocks of base station after downstream transmission blocks sent data retransmission bag.
Perhaps, for the data sub-packets that the one or more physical frames in first three downstream physical frame of using downstream transmission blocks send, first ascending physical signal frame of first uplink transmission block of terminal after downstream transmission blocks sends response message; For the data sub-packets that the one or more physical frames in back three downstream physical frame of using downstream transmission blocks send, second ascending physical signal frame of first uplink transmission block of terminal after downstream transmission blocks sends response message; And base station first downstream transmission blocks after downstream transmission blocks is sent data retransmission bag.
Preferably, said method further comprises, retransmission threshold value is set in advance; And the transmission number of times in the data sub-packets of demodulation failure reaches under the situation of retransmission threshold value, and the base station no longer retransmits, wherein; The data retransmission bag that sends for the n time is a n level data retransmission bag; Wherein, n＜=N, N are retransmission threshold value.
Preferably, said method comprises that further for the successful data sub-packets of demodulation, base station corresponding downstream physical frame in next downstream transmission blocks sends other data sub-packets.
Wherein, position in the downstream transmission blocks of corresponding downstream physical frame above-mentioned under it and the position consistency of downstream physical frame in downstream transmission blocks of sending data sub-packets.
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 6 continuous downstream physical frame, will comprise that the uplink transmission block of 2 continuous ascending physical signal frames is used for the time division duplex of uplink.
Uplink retransmission method according to the embodiment of the invention comprises following processing: the mapping relations of ascending physical signal frame and downstream physical frame are set in advance, make each ascending physical signal frame all corresponding to two continuous downstream physical frame; 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 base station demodulates 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 is sent the response message of data sub-packets that has been used to represent whether successful demodulation; The terminal demodulates response message; And wrap whether demodulation success according to response message judgment data; 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 bag of the data sub-packets of demodulation failure.
Wherein, Above-mentioned mapping relations are: first ascending physical signal frame in the uplink transmission block is corresponding to second in the downstream transmission blocks and the 3rd downstream physical frame, and second ascending physical signal frame is corresponding to the 4th in the downstream transmission blocks and the 5th downstream physical frame.
Wherein, The corresponding downstream physical frame of the downstream transmission blocks of above-mentioned base station after uplink transmission block send be used to represent whether successful demodulation the operation of response message of data sub-packets be specially: when the terminal uses first ascending physical signal frame to send data sub-packets, the base station second with the 3rd downstream physical frame in any transmission response message; When the terminal uses second ascending physical signal frame to send data sub-packets, the base station the 4th with the 5th downstream physical frame in any transmission response message.
Preferably, said method further comprises: for the successful ascending physical signal frame of data sub-packets demodulation, terminal corresponding ascending physical signal frame in next uplink transmission block sends other data sub-packets.
Preferably, said method further comprises: retransmission threshold value is set in advance, and reaches under the situation of retransmission threshold value at the number of retransmissions of the data sub-packets of demodulation failure; No longer retransmit; Wherein, the data retransmission bag that send for the n time at the terminal is a n level data retransmission bag, wherein; N＜=N, N are retransmission threshold value.
Through above-mentioned at least one technical scheme provided by the invention; Under the TDD6:2 mode, in downlink transfer, through replying symbol (response message) in corresponding ascending physical signal frame transmission; Can be so that base station and terminal have the relatively sufficient time to resolve from the other side's data or message and carry out subsequent treatment; Realized the re-transmission of data, in uplink, through replying symbol in the transmission of corresponding downstream physical frame; Realize the re-transmission of data equally, thereby remedied 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 specification subsequently, and, partly from specification, become obvious, perhaps understand through embodiment of the present invention.The object of the invention can be realized through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart based on the descending repeating method of TDD system according to the embodiment of the invention;
Fig. 2 (a) and Fig. 2 (b) are the sketch mapes of the embodiment one of method shown in Figure 1;
Fig. 3 (a) and Fig. 3 (b) are the sketch mapes of the embodiment two of method shown in Figure 1;
Fig. 4 is the flow chart based on the uplink retransmission method of TDD system according to the embodiment of the invention;
Fig. 5 (a) and Fig. 5 (b) are the sketch mapes of the embodiment three of method shown in Figure 4.
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 explanation and explains the present invention, and be not used in qualification the present invention.
Method embodiment one
At first; The problem that lacks a kind of retransmission mechanism in the downlink data transmission to the TDD6:2 mode; The embodiment of the invention provides a kind of descending repeating 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 6 continuous downstream physical frame, will comprise that the uplink transmission block of 2 continuous ascending physical signal frames is used for the TDD mode of uplink (that is TDD6:2 mode).
Fig. 1 is the flow chart based on the descending repeating method of wireless communications tdd system according to the embodiment of the invention.As shown in Figure 1, this method comprises following processing:
Step S102; The mapping relations of ascending physical signal frame and downstream physical frame are set in advance; Make that first three downstream physical frame in the downstream transmission blocks is corresponding with first physical frame in the uplink transmission block, back three downstream physical frame in the downstream transmission blocks are corresponding with second physical frame in the uplink transmission block;
Step S104, the base station uses 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 that terminal demodulates receives;
Step S108, based on demodulation result, the terminal is according to the mapping relations that are provided with in advance, the response message of data sub-packets that the corresponding ascending physical signal frame transmission of the uplink transmission block downstream transmission blocks after has been used to represent whether successful demodulation;
Step S110, the base station demodulates response message, and wrap whether demodulation success according to response message judgment data, for the data sub-packets of demodulation failure, the corresponding downstream physical frame of base station in follow-up downstream transmission blocks sent data retransmission bag.Here position in the downstream transmission blocks of corresponding downstream physical frame under it of mentioning and the position consistency of downstream physical frame in downstream transmission blocks of sending data sub-packets.
In the present invention; For the ease of describing; Suppose 6 downstream physical frame of downstream transmission blocks are divided into two groups, first, second is made as one group with the 3rd physical frame, and the the 4th, the 5th and the 6th physical frame is made as one group; In order to set forth conveniently; The position of these two physical frame groups is defined as L0, L1 respectively, and the data sub-packets of sending from these two positions is defined as P0, P1 respectively, that is to say; The data sub-packets of sending in first physical frame groups of downstream transmission blocks be defined as P0 (promptly in this physical frame groups any one or simultaneously two of Span Continuous or stride the data sub-packets that three physical frames send and be defined as P0), the data sub-packets of sending in second physical frame groups of downstream transmission blocks is defined as P1.The data sub-packets of these two diverse locations can be issued a terminal, also can be to issue different terminal.The original position that data sub-packets is sent can be in first downstream transmission blocks of superframe, also can be in second or the 3rd downstream transmission blocks of superframe.
According to the delay sensitive degree of business and the disposal ability of equipment, different processing can be carried out in the terminal.
Particularly; Under the insensitive situation of service delay; Data sub-packets for the one or more physical frames transmissions in first three downstream physical frame of using downstream transmission blocks; In step S108, first ascending physical signal frame of first uplink transmission block of terminal after ascending physical signal frame downstream transmission blocks sends response message; For the data sub-packets that the one or more physical frames in back three downstream physical frame of using downstream transmission blocks send, in step S110, second ascending physical signal frame of second uplink transmission block of terminal after downstream transmission blocks sends response message; And in step S108, second downstream transmission blocks of base station after downstream transmission blocks sent data retransmission bag.
Under the fast situation of service delay sensitivity and device processes ability; Data sub-packets for the one or more physical frames transmissions in first three downstream physical frame of using downstream transmission blocks; In step S108, first ascending physical signal frame of first uplink transmission block of terminal after ascending physical signal frame downstream transmission blocks sends response message; For the data sub-packets that the one or more physical frames in back three downstream physical frame of using downstream transmission blocks send, in step S110, second ascending physical signal frame of first uplink transmission block of terminal after downstream transmission blocks sends response message; And in step S108, base station first downstream transmission blocks after downstream transmission blocks is sent data retransmission bag.
In embodiments of the present invention, preferably, retransmission threshold value (N) can also be set in advance, and reach under the situation of retransmission threshold value, no longer retransmit at the transmission number of times of the data sub-packets of demodulation failure.For example, can be set to 5 by N.Correspondingly, the data retransmission bag that send for the n time the base station is a n level data retransmission bag, wherein, and n＜=N.
In addition, for the successful data sub-packets of demodulation, base station corresponding downstream physical frame in follow-up downstream transmission blocks sends other data sub-packets.
Below, with further accompanying drawings embodiments of the invention.
Embodiment one: for the processing of the insensitive business of time delay
In this embodiment, the processing mode for the corresponding ACK/NACK message in L0 position is following:
For the data sub-packets of L0 position, terminal demodulates after the data sub-packets of L0 position, in step S108, first physical frame on the uplink transmission block that ensuing 2 continuous ascending physical signal frames become sends ACK or NACK message.In step S110; This ACK/NACK message of base station demodulates; If ACK message; Expression terminal success demodulating data, then other data sub-packets (the HARQ retransmission processing method of other data sub-packets is identical with former data sub-packets) are sent in the base station on first physical frame groups on ensuing second downstream transmission blocks.If NACK message, the expression terminal does not have successful demodulating data, and then first order data retransmission bag is sent in the base station on the respective channel resource of first physical frame groups on ensuing second downstream transmission blocks.
Afterwards, if the terminal right demodulation behind the first order data retransmission bag, then ACK message is sent in first physical frame position on the uplink transmission block that ensuing 2 continuous ascending physical signal frames become; If the terminal has not had right demodulation first order data retransmission bag, then first physical frame position transmission NACK message on the uplink transmission block that ensuing 2 continuous ascending physical signal frames become.
Next; Base station demodulates ACK/NACK message; If ACK message, then other data sub-packets (the HARQ retransmission processing method of other data sub-packets is identical with former data sub-packets) are sent in the base station on first physical frame groups position on ensuing second downstream transmission blocks.If NACK message, then second level data retransmission bag is sent in the base station on the respective channel resource of first physical frame groups on ensuing second downstream transmission blocks.
That is to say; As long as the terminal right demodulation downlink data bag of L0 position; Then ACK message is sent in first physical frame position on ensuing uplink transmission block; The base station receives ACK message, just on first physical frame groups on ensuing second downstream transmission blocks, sends other data sub-packets; As long as the terminal does not have the downlink data bag of right demodulation L0 position; Then NACK message is sent in first physical frame position on ensuing uplink transmission block; The base station receives NACK message; Just on the respective channel resource of first physical frame groups on ensuing second downstream transmission blocks, need to send N level data retransmission bag, the maximum of N is generally 5, also can be taken as other positive integer.
Processing mode for the corresponding ACK/NACK message in L1 position is following:
Terminal demodulates after the data sub-packets of L1 position, second physical frame on ensuing second uplink transmission block sends ACK or NACK message.
This ACK/NACK message of base station demodulates; If ACK message; Expression terminal success demodulating data, then other data sub-packets (the HARQ retransmission processing method of other data sub-packets is identical with former data sub-packets) are sent in the base station on second physical frame groups on the ensuing downstream transmission blocks.If NACK message, the expression terminal does not have successful demodulating data, and then first order data retransmission bag is sent in the base station on the respective channel resource of second physical frame groups on the ensuing downstream transmission blocks.
If the terminal right demodulation behind the first order data retransmission bag, then ACK message is sent in second physical frame position on ensuing second uplink transmission block; If the terminal has not had right demodulation first order data retransmission bag, then second physical frame position transmission NACK message on ensuing second uplink transmission block.
This ACK/NACK message of base station demodulates, if ACK message, then other data sub-packets (the HARQ retransmission processing method of other data sub-packets is identical with former data sub-packets) are sent in the base station on second physical frame groups on the ensuing downstream transmission blocks.If NACK message, then second level data retransmission bag is sent in the base station on the respective channel resource of second physical frame groups on the ensuing downstream transmission blocks.
In like manner; As long as the downlink data of right demodulation L1 position, terminal bag; Then ACK message is sent in second physical frame position on second uplink transmission block next, and the base station receives ACK message, just other data sub-packets of transmission on second physical frame groups on the ensuing downstream transmission blocks; As long as the terminal does not have the downlink data bag of right demodulation L1 position; Then NACK message is sent in second physical frame position on ensuing second uplink transmission block; The base station receives NACK message; Just on the respective channel resource of second physical frame groups on the ensuing downstream transmission blocks, need to send N level data retransmission bag, the maximum of N is generally 5, also can be taken as other positive integer.
Sketch map through Fig. 2 provides can be understood said process better.
(1) send the processing of data sub-packets P0 for the L0 position:
P0 goes up at descending first physical frame groups L0 shown in Fig. 2 (a) and Fig. 2 (b) and sends.That is to say; P0 sends on physical frame F0 or F1 or F2; Also can cross over continuous two physical frames, promptly on two physical frame F0 and F1 or F1 and F2, send simultaneously, also can cross over three physical frames and also promptly on three physical frame F0, F1 and F2, send simultaneously.(corresponding to above-mentioned step S104)
If terminal right demodulation P0; Then send ACK message in the position of R0; Shown in Fig. 2 (a); After (corresponding to above-mentioned step S 108) base station received ACK message, then first physical frame groups (being made up of three physical frame F12, F13 and F14) in ensuing second downstream transmission blocks went up other data sub-packets of transmission P ' 0.The HARQ retransmission processing method of other data sub-packets P ' 0 is identical with data sub-packets P0's.(corresponding to above-mentioned step S110).
If the terminal does not have right demodulation P0; Then send NACK message in the position of R0; Shown in Fig. 2 (b), after the base station receives NACK message, then on the respective channel resource of first physical frame groups of ensuing second downstream transmission blocks, send first order data retransmission bag R1P0.
If the terminal right demodulation behind the first order data retransmission bag, then as Fig. 2 (a) shown in, in the position of R4 transmission ACK message; After the base station receives ACK message, then send other data sub-packets P ' 0 in the position of first physical frame groups of ensuing second downstream transmission blocks.If the terminal does not have right demodulation first order data retransmission bag, then shown in Fig. 2 (b), send NACK message in the position of R4.After the base station receives NACK message, then on the respective channel resource of first physical frame groups of ensuing second downstream transmission blocks, send second level data retransmission bag R2P0.
In like manner; If the terminal right demodulation downlink data bag of L0 position; Just ACK message is sent in first physical frame position on ensuing uplink transmission block; The base station receives ACK message, just on first physical frame groups on ensuing second downstream transmission blocks, sends other data sub-packets; If the terminal does not have the downlink data bag of right demodulation L0 position; Then NACK message is sent in first physical frame position on ensuing uplink transmission block; The base station receives NACK message; Just on the respective channel resource of first physical frame groups on ensuing second downstream transmission blocks, need to send N level data retransmission bag, the maximum of N is generally 5, also can be taken as other positive integer.
(2) send the processing of data sub-packets P1 for the L1 position:
P1 descending second physical frame groups L1 in shown in Fig. 2 (a) and Fig. 2 (b) goes up and sends.That is to say; P1 sends on physical frame F3 or F4 or F5; Also can cross over continuous two physical frames, promptly on two physical frame F3 and F4 or F4 and F5, send simultaneously, also can cross over three physical frames and also promptly on three physical frame F3, F4 and F5, send simultaneously.
If the terminal right demodulation P1; Then send ACK message in the position of R3; Shown in Fig. 2 (a), after the base station received ACK message, then second physical frame groups (being made up of three physical frame F15, F16 and F17) in ensuing downstream transmission blocks went up other data sub-packets of transmission P ' 1.The HARQ retransmission processing method of other data sub-packets P ' 1 is identical with data sub-packets P1's.
If the terminal does not have right demodulation P1; Then send NACK message in the position of R3; Shown in Fig. 2 (b), after the base station receives NACK message, then on the respective channel resource of second physical frame groups of ensuing downstream transmission blocks, send first order data retransmission bag R1P1.
If the terminal right demodulation first order data retransmission bag, then send ACK message in the position of second physical frame of ensuing second uplink transmission block; After the base station receives ACK message, then send other data sub-packets P ' 1 in the position of second physical frame groups of ensuing downstream transmission blocks.
If the terminal has right demodulation first order data retransmission bag, then send NACK message in the position of second physical frame of ensuing second uplink transmission block.After the base station receives NACK message, then on the respective channel resource of second physical frame groups of ensuing downstream transmission blocks, send second level data retransmission bag R2P1.
In like manner; If the terminal right demodulation downlink data bag of L1 position; Then ACK message is sent in second physical frame position on ensuing second uplink transmission block; The base station receives ACK message, just on second physical frame groups on ensuing second downstream transmission blocks, sends other data sub-packets; If the terminal does not have the downlink data bag of right demodulation L1 position; Then NACK message is sent in second physical frame position on ensuing second uplink transmission block; The base station receives NACK message; Just on the respective channel resource of second physical frame groups on ensuing second downstream transmission blocks, need to send N level data retransmission bag, the maximum of N is generally 5, also can be taken as other positive integer.
Embodiment two: delay sensitive and the fast Business Processing of device processes ability
In this embodiment, terminal demodulates after the data sub-packets of L0 and L1 position, on the uplink transmission block that ensuing 2 continuous ascending physical signal frames are formed, send ACK or NACK message respectively.ACK representes terminal success demodulating data, and NACK representes that the terminal does not have successful demodulating data.The ACK/NACK message of these two diverse locations is distinguished the data sub-packets P0 and the P1 of corresponding L0, these 2 diverse locations of L1 successively.
The ACK/NACK message of these 2 diverse locations of base station demodulates; If ACK message; Expression terminal success demodulating data, then other data sub-packets (the HARQ retransmission processing method of other data sub-packets is identical with former data sub-packets) are sent in corresponding physical frame group position in the base station on the downstream transmission blocks that ensuing 6 continuous downstream physical frame are formed.If NACK message, the expression terminal does not have successful demodulating data, and then first order data retransmission bag is sent in the base station on the respective channel resource of corresponding physical frame group position on the downstream transmission blocks that ensuing 6 continuous downstream physical frame are formed.
If the terminal right demodulation behind the first order data retransmission bag, then the corresponding physical frame position is sent ACK message on the uplink transmission block that ensuing 2 continuous ascending physical signal frames are formed; If the terminal does not have right demodulation first order data retransmission bag, then the corresponding physical frame position is sent NACK message on the uplink transmission block that ensuing 2 continuous ascending physical signal frames are formed.
The ACK/NACK message of these 2 diverse locations of base station demodulates, if ACK message, expression terminal success demodulating data, then other data sub-packets are sent in corresponding physical frame group position in the base station on the downstream transmission blocks that ensuing 6 continuous downstream physical frame are formed.If NACK message, the expression terminal does not still have successful demodulating data, and then second level data retransmission bag is sent in the base station on the respective channel resource of corresponding physical frame group position on the downstream transmission blocks that ensuing 6 continuous downstream physical frame are formed.
In like manner, if terminal right demodulation downlink data bag then sends ACK message in the ascending physical signal frame position of correspondence, the base station receives ACK message, just sends other data sub-packets in corresponding physical frame group position; As long as the terminal does not have right demodulation downlink data bag; Then send NACK message in the ascending physical signal frame position of correspondence; The base station receives NACK message; Just on the respective channel resource of corresponding physical frame group position, need to send N level data retransmission bag, the maximum of N is generally 5, also can be taken as other positive integer.
Sketch map through Fig. 3 (a) and Fig. 3 (b) provide can be understood the foregoing description better.
The data sub-packets P0 that sends with the L0 position is an example.P0 goes up at descending first physical frame groups L0 shown in Fig. 3 (a) and Fig. 3 (b) and sends.That is to say; P0 sends on physical frame F0 or F 1 or F2; Also can cross over continuous two physical frames, promptly on two physical frame F0 and F1 or F1 and F2, send simultaneously, also can cross over three physical frames and also promptly on three physical frame F0, F1 and F2, send simultaneously.
If terminal right demodulation P0; Then send ACK message in the position of R0; Shown in Fig. 3 (a), after the base station receives ACK message, then send other data sub-packets P ' 0 in the position of first physical frame groups (forming) of ensuing downstream transmission blocks by three physical frame F6, F7 and F8.The HARQ retransmission processing method of other data sub-packets P ' 0 is identical with data sub-packets P0's.
If the terminal does not have right demodulation P0; Then send NACK message in the position of R0; Shown in Fig. 3 (b), after the base station receives NACK message, then on the respective channel resource of first physical frame groups position of ensuing downstream transmission blocks, send first order data retransmission bag R1P0.
If the terminal right demodulation behind the first order data retransmission bag, then send ACK message in the position of R2; After the base station receives ACK message, then send other data sub-packets P ' 0 in the position of first physical frame groups of ensuing downstream transmission blocks.
If the terminal has not had right demodulation first order data retransmission bag then sends NACK message in the position of R2.After the base station receives NACK message, then on the respective channel resource of first physical frame groups position of ensuing downstream transmission blocks, send second level data retransmission bag R2P0.
In like manner, if the terminal right demodulation downlink data bag that sends of L0 position, then send ACK message in the corresponding physical frame position, the base station receives ACK message, just other data sub-packets of transmission in corresponding physical frame group position; If the terminal does not have right demodulation downlink data bag; Then send NACK message in the corresponding physical frame position; The base station receives NACK message; Just on the respective channel resource of corresponding physical frame group position, send N level data retransmission bag, the maximum of N is generally 5, also can be taken as other positive integer.
Similarly, for P1, the HARQ retransmission processing method of data sub-packets and data sub-packets P0's is roughly the same, and different is that P1 sends in second physical frame groups position of downstream transmission blocks, replys symbol and sends in second physical frame position of uplink transmission block.
Method embodiment two
According to the embodiment of the 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 6 continuous downstream physical frame, will comprise that the uplink transmission block of 2 continuous ascending physical signal frames is used for the TDD mode of uplink (TDD6:2 mode).
As shown in Figure 4, comprise following processing according to the uplink retransmission method of the embodiment of the invention:
Step S402 is provided with the mapping relations of ascending physical signal frame and downstream physical frame in advance, makes each ascending physical signal frame all corresponding to two continuous downstream physical frame;
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 base station demodulates 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 is sent the response message of data sub-packets that has been used to represent whether successful demodulation;
Step S410; The terminal receives and the demodulation response message; And wrap whether demodulation success according to response message judgment data; 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 bag of the data sub-packets of demodulation failure.
Wherein, Above-mentioned mapping relations are: first ascending physical signal frame in the uplink transmission block is corresponding to second in the downstream transmission blocks and the 3rd downstream physical frame, and second ascending physical signal frame is corresponding to the 4th in the downstream transmission blocks and the 5th downstream physical frame.
Wherein, The corresponding downstream physical frame of the downstream transmission blocks of above-mentioned base station after uplink transmission block send be used to represent whether successful demodulation the operation of response message of data sub-packets be specially: when the terminal uses first ascending physical signal frame to send data sub-packets, the base station second with the 3rd downstream physical frame in any transmission response message; When the terminal uses second ascending physical signal frame to send data sub-packets, the base station the 4th with the 5th downstream physical frame in any transmission response message.
In addition, said method further comprises: for the successful ascending physical signal frame of data sub-packets demodulation, terminal corresponding ascending physical signal frame in next uplink transmission block sends other data sub-packets.
Preferably, said method further comprises: retransmission threshold value is set in advance, and reaches under the situation of retransmission threshold value at the number of retransmissions of the data sub-packets of demodulation failure; No longer retransmit; Wherein, the data retransmission bag that send for the n time at the terminal is a n level data retransmission bag, wherein; N＜=N, N are retransmission threshold value.
Embodiment three:
In the unit of transfer of superframe, a downstream transmission blocks is made up of 6 continuous downstream physical frame.In these 6 downstream physical frame, suppose that second and the 3rd physical frame is set to first physical frame groups, the 4th and the 5th physical frame is set to second physical frame groups.In order to set forth conveniently, the position of these two physical frame groups is defined as L0, L1 respectively.The uplink transmission block that the terminal is formed through 2 continuous ascending physical signal frames sends upstream data to the base station, and the data sub-packets of sending from these 2 ascending physical signal frames is defined as P0, P1 respectively.The data sub-packets of these 2 different physical frames can be to issue the base station by a terminal, also can be to issue the base station by different terminal.The original position that data sub-packets is sent can be at first uplink transmission block of superframe; Also can be at second or the 3rd uplink transmission block of superframe; In order to set forth conveniently, begin transmission on first uplink transmission block of the sub-Bao Xiancong superframe of tentation data.
Base station demodulates after the data sub-packets of these 2 diverse locations, will on the downstream transmission blocks that ensuing 6 continuous downstream physical frame are formed, send ACK or NACK message respectively in corresponding physical frame group position.ACK representes base station success demodulating data, and NACK representes that the base station does not have successful demodulating data.The ACK/NACK message of these 2 different physical frame groups positions is distinguished the data sub-packets of corresponding P0, these 2 diverse locations of P1 successively.
The ACK/NACK message of these 2 different physical frame groups positions of terminal demodulates; If ACK message; Expression base station success demodulating data, then terminal corresponding physical frame position on the uplink transmission block that ensuing 2 continuous ascending physical signal frames are formed is sent other data sub-packets (the HARQ retransmission processing method of other data sub-packets is identical with former data sub-packets).If NACK message, the expression base station does not have successful demodulating data, and then first order data retransmission bag is sent in the terminal on the respective channel resource of corresponding physical frame position on the uplink transmission block that ensuing 2 continuous ascending physical signal frames are formed.
If the base station right demodulation behind the first order data retransmission bag, then ACK message is sent in corresponding physical frame group position on the downstream transmission blocks that ensuing 6 continuous downstream physical frame are formed; If the base station has not had right demodulation first order data retransmission bag, then corresponding physical frame group position transmission NACK message on the downstream transmission blocks that ensuing 6 continuous downstream physical frame are formed.
The ACK/NACK message of these 2 different physical frame groups positions of terminal demodulates; If ACK message; Expression base station success demodulating data, then terminal corresponding physical frame position on the uplink transmission block that ensuing 2 continuous ascending physical signal frames are formed is sent other data sub-packets.If NACK message, the expression base station does not still have successful demodulating data, and then second level data retransmission bag is sent at the terminal on the respective channel resource of corresponding physical frame position on the uplink transmission block that ensuing 2 continuous ascending physical signal frames are formed.
In like manner, if base station right demodulation upstream data bag then sends ACK message in corresponding physical frame group position, the terminal receives ACK message, just sends other data sub-packets in the corresponding physical frame position; If the base station does not have right demodulation upstream data bag; Then send NACK message in corresponding physical frame group position; The terminal receives NACK message; Just on the respective channel resource of corresponding physical frame position, send N level data retransmission bag, the maximum of N is generally 5, also can be taken as other positive integer.
Sketch map through Fig. 5 (a) and Fig. 5 (b) provide can be understood present embodiment better.
To send data sub-packets P0 is example, and P0 sends on up first physical frame shown in Fig. 5 (a) and Fig. 5 (b), also promptly on physical frame R0, sends.
Shown in Fig. 5 (a), if the base station right demodulation P0, then send ACK message in the position of first physical frame groups of ensuing downstream transmission blocks, that is to say that ACK message can be sent on physical frame F7 or F8.After the terminal receives ACK message, then on the R2 of first physical frame position of ensuing uplink transmission block, send 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.
Shown in Fig. 5 (b), if the base station does not have right demodulation P0, then send NACK message in the position of first physical frame groups of ensuing downstream transmission blocks, that is to say that NACK message can be sent on physical frame F7 or F8.After the terminal receives NACK message, then on the respective channel resource on the R2 of first physical frame position of ensuing uplink transmission block, send first order data retransmission bag R1P0.
If the base station right demodulation first order data retransmission bag, then send ACK message in first physical frame groups position of ensuing downstream transmission blocks; After the terminal receives ACK message, then send other data sub-packets P ' 0 in the position of first physical frame of ensuing uplink transmission block.
If the base station has not still had right demodulation first order data retransmission bag then sends NACK message in the position of first physical frame groups of ensuing downstream transmission blocks.After the terminal receives NACK message, then on the respective channel resource of first physical frame position of ensuing uplink transmission block, send second level data retransmission bag R2P0.
In like manner, if the base station right demodulation upstream data bag, then send ACK message in corresponding physical frame group position, the terminal receives ACK message, just in other data sub-packets of corresponding physical frame position transmission; If the base station does not have right demodulation upstream data bag; Then send NACK message in corresponding physical frame group position; The terminal receives NACK message; Just on the respective channel resource of corresponding physical frame position, need to send N level data retransmission bag, the maximum of N is generally 5, also can be taken as other positive integer.
Similarly, roughly the same for the HARQ retransmission processing method of P1 data sub-packets and data sub-packets P0, different is that P1 sends in second physical frame position of uplink transmission block, replys symbol and sends in second physical frame groups position of downstream transmission blocks.
Need to prove that the uplink transmission block of data sub-packets original transmission is unrestricted in the position of superframe, can be first uplink transmission block, also can be second or the 3rd uplink transmission block.The border of Superframe is to the not restriction of HARQ retransmission process of data sub-packets.
As stated, by means of above-mentioned at least one technical scheme that provides through the embodiment of the invention, under the TDD6:2 mode; In downlink transfer; Through replying symbol (response message), can realize the re-transmission of data so that base station and terminal have time of abundance relatively to resolve from the other side's data or message and carry out subsequent treatment in corresponding ascending physical signal frame transmission; In uplink; Through replying symbol, realized the re-transmission of data equally, thereby remedied the defective that lacks a kind of retransmission mechanism in the correlation technique in the transmission of corresponding downstream physical frame.
The above is merely 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 changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. descending repeating method based on time division duplex system in wireless communication; Said time division duplex system in wireless communication is used for downlink transfer based on the downstream transmission blocks that will comprise 6 continuous downstream physical frame; To comprise that the uplink transmission block of 2 continuous ascending physical signal frames is used for the time division duplex of uplink; It is characterized in that said method comprises:
The mapping relations of ascending physical signal frame and downstream physical frame are set in advance; Make that first three downstream physical frame in the downstream transmission blocks is corresponding with first physical frame in the uplink transmission block, back three downstream physical frame in the downstream transmission blocks are corresponding with second physical frame in the uplink transmission block;
The base station uses the downstream physical frame of said downstream transmission blocks to send one or more data sub-packets to one or more terminals;
The said data sub-packets that said terminal demodulates receives;
Based on demodulation result, said terminal is according to the said mapping relations that are provided with in advance, the response message of said data sub-packets that the corresponding ascending physical signal frame transmission of the uplink transmission block said downstream transmission blocks after has been used to represent whether successful demodulation;
The said response message of said base station demodulates, and whether demodulation is successful to judge said data sub-packets according to said response message, for the data sub-packets of demodulation failure, said base station corresponding downstream physical frame in follow-up downstream transmission blocks sends data retransmission bag.
2. method according to claim 1 is characterized in that,
For the data sub-packets that the one or more physical frames in first three downstream physical frame of using said downstream transmission blocks send, first ascending physical signal frame of first uplink transmission block of said terminal after said downstream transmission blocks sends said response message;
For the data sub-packets that the one or more physical frames in back three downstream physical frame of using said downstream transmission blocks send, second ascending physical signal frame of second uplink transmission block of said terminal after said downstream transmission blocks sends said response message; And,
Second downstream transmission blocks of said base station after said downstream transmission blocks sent said data retransmission bag.
3. method according to claim 1 is characterized in that,
For the data sub-packets that the one or more physical frames in first three downstream physical frame of using said downstream transmission blocks send, first ascending physical signal frame of first uplink transmission block of said terminal after said downstream transmission blocks sends said response message;
For the data sub-packets that the one or more physical frames in back three downstream physical frame of using said downstream transmission blocks send, said second ascending physical signal frame of first uplink transmission block of said terminal after said downstream transmission blocks sends said response message; And
Said base station first downstream transmission blocks after said downstream transmission blocks is sent said data retransmission bag.
4. according to each described method in the claim 1 to 3, it is characterized in that, further comprise:
Retransmission threshold value is set in advance; And the transmission number of times in the said data sub-packets of demodulation failure reaches under the situation of said retransmission threshold value, and said base station no longer retransmits, wherein; The said data retransmission bag that sends for the n time is a n level data retransmission bag; Wherein, n＜=N, N are said retransmission threshold value.
5. according to claim 1 or 3 described methods, it is characterized in that, further comprise:
For the successful data sub-packets of demodulation, said base station corresponding downstream physical frame in next downstream transmission blocks sends other data sub-packets.
6. according to each described method in the claim 1 to 3, it is characterized in that position in the downstream transmission blocks of corresponding downstream physical frame under it and the position consistency of said downstream physical frame in downstream transmission blocks of sending said data sub-packets.
7. uplink retransmission method based on time division duplex system in wireless communication; Said time division duplex system in wireless communication is used for downlink transfer based on the downstream transmission blocks that will comprise 6 continuous downstream physical frame; To comprise that the uplink transmission block of 2 continuous ascending physical signal frames is used for the time division duplex of uplink; It is characterized in that said method comprises:
The mapping relations of ascending physical signal frame and downstream physical frame are set in advance, make each ascending physical signal frame all corresponding to two continuous downstream physical frame;
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 said base station demodulates receives;
Based on demodulation result and said mapping relations, the corresponding downstream physical frame of the downstream transmission blocks of said base station after said uplink transmission block is sent the response message of said data sub-packets that has been used to represent whether successful demodulation;
The said response message of said terminal demodulates; And whether demodulation is successful to judge said data sub-packets according to said response message; For the ascending physical signal frame of data sub-packets demodulation failure, said terminal corresponding ascending physical signal frame in next uplink transmission block sends the data retransmission bag of the said data sub-packets of demodulation failure.
8. method according to claim 7; It is characterized in that; Said mapping relations are: first ascending physical signal frame in the said uplink transmission block is corresponding to second in the said downstream transmission blocks and the 3rd downstream physical frame, and second ascending physical signal frame is corresponding to the 4th in the said downstream transmission blocks and the 5th downstream physical frame.
9. method according to claim 8 is characterized in that, the corresponding downstream physical frame of the downstream transmission blocks of said base station after said uplink transmission block send be used to represent whether successful demodulation the operation of response message of said data sub-packets be specially:
When said terminal used said first ascending physical signal frame to send said data sub-packets, said base station any in said second and the 3rd downstream physical frame sent said response message;
When said terminal used said second ascending physical signal frame to send said data sub-packets, said base station any in said the 4th and the 5th downstream physical frame sent said response message.
10. method according to claim 7 is characterized in that, said method further comprises:
For the successful ascending physical signal frame of data sub-packets demodulation, said terminal corresponding ascending physical signal frame in next uplink transmission block sends other data sub-packets.
11. method according to claim 7 is characterized in that, said method further comprises:
Retransmission threshold value is set in advance; And the number of retransmissions in the said data sub-packets of demodulation failure reaches under the situation of said retransmission threshold value, no longer retransmits, wherein; The said data retransmission bag that send for the n time at said terminal is a n level data retransmission bag; Wherein, n＜=N, N are said retransmission threshold value.
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| Huawei等."Way forward for TDD HARQ process".《TSG-RAN WG1 #52 R1-081124》.2008,全文. |
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