CN106936547A - Data transmission method and device - Google Patents
Data transmission method and device Download PDFInfo
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- CN106936547A CN106936547A CN201511021102.2A CN201511021102A CN106936547A CN 106936547 A CN106936547 A CN 106936547A CN 201511021102 A CN201511021102 A CN 201511021102A CN 106936547 A CN106936547 A CN 106936547A
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- Prior art keywords
- user equipment
- nack
- ack
- nearly
- feedback
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
- H04L1/189—Transmission or retransmission of more than one copy of a message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
Abstract
The invention discloses data transmission method and device, the method includes：Base station is to the sending signal of at least two user equipmenies by being overlapped transmission after power distribution；Base station receives the ACK/NACK of at least two user equipmenies feedback, and determines whether to be retransmitted according to ACK/NACK and the mode for retransmitting is determined in the case where needing to retransmit.Solve the problems, such as how more preferably to use retransmission scheme by the present invention, improve the efficiency of re-transmission.
Description
Technical field
The present invention relates to communication field, in particular to data transmission method and device.
Background technology
In multi-user transmission scheme before LTE R13, user is reduced by way of orthogonal transmission
Between interference.But from the angle analysis of information theory, orthogonal transmission is Erasure channel capacity, therefore is one
Plant the transmission means of suboptimum.If can combine from transmitter and receiver accounting for, even if emitter is using non-
Orthogonal transmission mode, can be obtained better than orthogonal biography in receiver side by some advanced signal processing algorithms
Defeated performance, it might even be possible to reach theoretic multi-user's capacity circle, further lifting system performance.Wherein
One kind is achieved in that using supercomposed coding transmission (Superposition Transmission).Its basic thought
It is that channel status is quantified as the grade of different channel qualities according to different target transmission speeds for system,
One target transmission speed of determination of each channel quantitative grade correspondence.By two groups of signals respectively according to difference
Targeted rate independently carry out Channel Coding and Modulation mapping, then by both output constellations according to certain
Power sharing ratio be overlapped transmission.Corresponding receiver is using based on minimum mean square error criterion
(Minimum Mean Square Error, MMSE) Interference Cancellation (Interference Cancellation,
IC) receiver is obtained with approaching the performance of multiuser channel capacity.
The SI problems of new project verification in current 3GPP：Multi-user's superposed transmission (Multi-user Superposition
Transmission, MUST), it is devoted to studying application of multi-user's superposed transmission in LTE system,
To the descending multi-user transmission performance of further lifting LTE system.
In MUST scenes, once can be with simultaneous transmission multiple user, each user can use identical
Or different precodings.For the HARQ procedure in MUST, multiple users can feed back simultaneously it is different or
Identical ACK/NACK states.If at least one user feedback is NACK, it is necessary to carry out weight
Pass, re-transmission now just there are two schemes：MUST is retransmitted and orthogonal retransmission.MUST is retransmitted and can improved
Retransmission efficiency, but the probability for retransmitting error can be than larger.Orthogonal retransmission can improve re-transmission and be properly received generally
Rate, but certain time delay can be introduced.How retransmission scheme preferably should use in the prior art not
There is solution.
The content of the invention
The invention provides data transmission method and device, to solve the problems, such as how more preferably to use retransmission scheme.
According to an aspect of the invention, there is provided a kind of data transmission method, including：Base station is at least two
The sending signal of individual user equipment is by being overlapped transmission after power distribution；Described in the base station reception extremely
The ACK/NACK of few two user equipmenies feedback, and according to ACK/NACK determine whether to be retransmitted with
And the mode for retransmitting is determined in the case where needing to retransmit.
Further, in the case where the user equipment is two user equipmenies, the base station receives described
The ACK/NACK of two user equipment feedbacks includes：The base station receives the remote use in the user equipment
The ACK/NACK of family equipment feedback, wherein, the remote user equipment feeds back the ACK/NACK of its own；
The base station receives the ACK/NACK of the nearly user equipment feedback in the user equipment, wherein, it is described
Nearly user equipment feeds back the remote corresponding ACK/NACK of user equipment and the nearly user equipment is corresponding
ACK/NACK；The nearly user equipment apart from the base station distance relative to the remote user equipment distance
The base station it is closer to the distance, the nearly user equipment using interference cancellation receiver receive signal.
Further, the base station determines whether to be retransmitted and is needing to retransmit according to ACK/NACK
In the case of determine retransmit mode include：The base station determines transmission according to the ACK/NACK for receiving
Whether mistake is caused by interlayer interference；If error of transmission is caused by interlayer interference, the base station determines to use
Orthogonal transmission is retransmitted；Otherwise, the base station determines to be retransmitted using MUST.
Further, it is described in the case where the user equipment includes nearly user equipment and remote user equipment
Base station determines whether to retransmit and determine that the mode for retransmitting includes at least one of according to ACK/NACK：
Nearly user equipment feedback remote user equipment feedback NACK and the nearly user equipment feeding back ACK,
The remote user equipment feedback NACK, the base station determines to be retransmitted using MUST；The nearly use
Family equipment the feedback remote user equipment feeding back ACK and the nearly user equipment feeding back ACK, the remote use
Family equipment feedback NACK, the base station determines to be retransmitted using MUST；The nearly user equipment is anti-
Present the remote user equipment feeding back ACK and the nearly user equipment feedback NACK, the remote user equipment
Feedback NACK, the base station determines to be retransmitted using MUST；The nearly user equipment feedback is described
Remote user equipment feeding back ACK and the nearly user equipment feedback NACK, the remote user equipment feedback
ACK, the base station determines to be retransmitted using MUST；The nearly user equipment feeds back the remote user
The equipment feedback NACK and nearly user equipment feedback NACK, the remote user equipment feeding back ACK,
The base station determines to be retransmitted using orthogonal transmission；It is anti-that the nearly user equipment feeds back the remote user equipment
The feedback NACK and nearly user equipment feedback NACK, the remote user equipment feedback NACK, it is described
Base station determination is used after being modified to MUST and retransmitted again；When the MUST using amendment is retransmitted
Afterwards, the nearly user equipment feedback remote user equipment feedback NACK and the nearly user equipment are anti-
Feedback NACK, the remote user equipment feedback NACK, the base station determines to be retransmitted using orthogonal transmission；
Nearly user equipment feedback remote user equipment feedback NACK and the nearly user equipment feeding back ACK,
The remote user equipment feeding back ACK, the base station determines to be retransmitted；The nearly user equipment
Feed back the remote user equipment feeding back ACK and the nearly user equipment feeding back ACK, the remote user equipment
Feeding back ACK, the base station determines to be retransmitted.
Further, the signal that the base station sends is expressed as：Wherein, 0<α<1
It is power splitting factor, sNAnd sFThe transmission symbol sebolic addressing of nearly user equipment and remote user equipment is represented respectively.
According to another aspect of the present invention, a kind of data transmission device is additionally provided, in base station, bag
Include：Laminating module, for the sending signal at least two user equipmenies by being folded after power distribution
Plus transmission；HARQ scheduler modules, the ACK/NACK for receiving at least two user equipmenies feedback,
And determine whether to be retransmitted according to ACK/NACK and the side for retransmitting is determined in the case where needing to retransmit
Formula.
Further, in the case where the user equipment is two user equipmenies, the HARQ processes
The ACK/NACK of the remote user equipment feedback that module is used to receive in the user equipment, wherein, it is described
Remote user equipment feeds back the ACK/NACK of its own；The HARQ scheduler modules are used to receive the use
The ACK/NACK of the nearly user equipment feedback in the equipment of family, wherein, the nearly user equipment feedback is described
The remote corresponding ACK/NACK of the user equipment and corresponding ACK/NACK of the nearly user equipment；It is described near
User equipment apart from the base station distance relative to the remote user equipment apart from the base station distance compared with
Closely, the nearly user equipment receives signal using interference cancellation receiver.
Further, the HARQ scheduler modules are used to determine transmission according to the ACK/NACK for receiving
Whether mistake is caused by interlayer interference；If error of transmission is caused by interlayer interference, the determining module is used for
It is determined that being retransmitted using orthogonal transmission；Otherwise, the determining module is used to determine to be carried out using MUST
Retransmit.
Further, it is described in the case where the user equipment includes nearly user equipment and remote user equipment
HARQ scheduler modules determine whether to retransmit and determine the mode for retransmitting including following according to ACK/NACK
At least one：The nearly user equipment feedback remote user equipment feedback NACK and the nearly user set
Standby feeding back ACK, the remote user equipment feedback NACK, it is determined that being retransmitted using MUST；It is described
Nearly user equipment the feedback remote user equipment feeding back ACK and the nearly user equipment feeding back ACK, it is described
Remote user equipment feedback NACK, it is determined that being retransmitted using MUST；The nearly user equipment feedback institute
State remote user equipment feeding back ACK and the nearly user equipment feedback NACK, the remote user equipment feedback
NACK, it is determined that being retransmitted using MUST；The nearly user equipment feedback remote user equipment feedback
The ACK and nearly user equipment feedback NACK, the remote user equipment feeding back ACK, it is determined that using
MUST is retransmitted；The nearly user equipment feedback remote user equipment feedback NACK and described near
User equipment feeds back NACK, the remote user equipment feeding back ACK, it is determined that carrying out weight using orthogonal transmission
Pass；The nearly user equipment feedback remote user equipment feedback NACK and the nearly user equipment feedback
NACK, the remote user equipment feedback NACK, it is determined that being carried out again afterwards using being modified to MUST
Retransmit；After being retransmitted using the MUST of amendment, the nearly user equipment feeds back the remote user equipment
Feedback NACK and the nearly user equipment feedback NACK, the remote user equipment feedback NACK, really
Surely retransmitted using orthogonal transmission；The nearly user equipment feedback remote user equipment feedback NACK
With the nearly user equipment feeding back ACK, the remote user equipment feeding back ACK, it is determined that need not carry out weight
Pass；The nearly user equipment feeds back the remote user equipment feeding back ACK and the nearly user equipment feedback
ACK, the remote user equipment feeding back ACK, it is determined that need not be retransmitted.
Further, the signal of the laminating module superposition is expressed as：Wherein, 0<α<1
It is power splitting factor, sNAnd sFThe transmission symbol sebolic addressing of nearly user equipment and remote user equipment is represented respectively.
By the present invention, using base station to the sending signal of at least two user equipmenies by power distribution after
It is overlapped transmission；The base station receives the ACK/NACK of at least two user equipmenies feedback, and
Determine whether to be retransmitted according to ACK/NACK and the mode for retransmitting is determined in the case where needing to retransmit.
Solve the problems, such as how more preferably to use retransmission scheme by the present invention, improve the efficiency of re-transmission.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, constitutes the part of the application,
Schematic description and description of the invention is used to explain the present invention, does not constitute to improper limit of the invention
It is fixed.In the accompanying drawings：
Fig. 1 is the flow chart of data transmission method according to embodiments of the present invention；
Fig. 2 is the structured flowchart of data transmission device according to embodiments of the present invention.
Specific embodiment
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the application
Can be mutually combined.Describe the present invention in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
A kind of data transmission method is provided in the present embodiment, and Fig. 1 is data according to embodiments of the present invention
The flow chart of transmission method, as shown in figure 1, the method comprises the following steps：
Step S102, base station is carried out to the sending signal of at least two user equipmenies by after power distribution
Superposed transmission；
Used as an optional embodiment, the signal that base station sends can be expressed as：
Wherein, 0<α<1 is power splitting factor, sNAnd sFThe hair of nearly user equipment and remote user equipment is represented respectively
Send symbol sebolic addressing
Step S104, the ACK/NACK of base station reception at least two user equipmenies feedback, and according to
ACK/NACK determines whether to be retransmitted and determined in the case where needing to retransmit the mode for retransmitting.
By above-mentioned steps, the ACK/NACK that can be fed back according at least two user equipmenies determines to retransmit
Mode, so as to solve the problems, such as how more preferably use retransmission scheme, improve the efficiency of re-transmission.
Used as an optional implementation method, in the case where user equipment is two user equipmenies, base station can
To receive the ACK/NACK of the feedback of the remote user equipment in user equipment, wherein, remote user equipment feedback
The ACK/NACK of its own；Base station receives the ACK/NACK of the nearly user equipment feedback in user equipment,
Wherein, nearly user equipment feeds back the remote corresponding ACK/NACK of user equipment and nearly user equipment is corresponding
ACK/NACK；Nearly user equipment apart from base station distance relative to remote user equipment apart from base station distance compared with
Closely, nearly user equipment receives signal using interference cancellation receiver.
Error of transmission may be caused by many reasons.In an optional implementation method, base station can basis
The ACK/NACK for receiving determines whether error of transmission is caused by interlayer interference；If error of transmission is by interlayer
Interference causes, then base station determines to be retransmitted using orthogonal transmission；Otherwise, base station determines to use MUST
Retransmitted.
For example, base station can determine whether to retransmit and determine that the mode for retransmitting includes according to ACK/NACK
At least one of：Nearly user equipment feeds back remote user equipment feedback NACK and nearly user equipment feedback
ACK, remote user equipment feeds back NACK, and base station determines to be retransmitted using MUST；Nearly user equipment
Remote user equipment feeding back ACK and nearly user equipment feeding back ACK are fed back, remote user equipment feeds back NACK,
Base station determines to be retransmitted using MUST；Nearly user equipment feeds back remote user equipment feeding back ACK and nearly use
Family equipment feedback NACK, remote user equipment feeds back NACK, and base station determines to be retransmitted using MUST；
Nearly user equipment feeds back remote user equipment feeding back ACK and nearly user equipment feedback NACK, remote user equipment
Feeding back ACK, base station determines to be retransmitted using MUST；Nearly user equipment feeds back remote user equipment feedback
NACK and nearly user equipment feedback NACK, remote user equipment feeding back ACK, base station is determined using orthogonal
Transmission is retransmitted；Nearly user equipment feeds back remote user equipment feedback NACK and nearly user equipment feedback
NACK, remote user equipment feeds back NACK, and base station determines to use to be modified MUST to be carried out again afterwards
Retransmit；After being retransmitted using the MUST of amendment, nearly user equipment feeds back remote user equipment feedback NACK
NACK is fed back with nearly user equipment, remote user equipment feeds back NACK, and base station determines to enter using orthogonal transmission
Row is retransmitted；Nearly user equipment feeds back remote user equipment feedback NACK and nearly user equipment feeding back ACK, far
User equipment feeding back ACK, base station determines to be retransmitted；Nearly user equipment feeds back remote user equipment
Feeding back ACK and nearly user equipment feeding back ACK, remote user equipment feeding back ACK, base station determines need not
Retransmitted.
In the present embodiment, a kind of data transmission device is additionally provided, in base station, Fig. 2 is according to this
The structured flowchart of the data transmission device of inventive embodiments, as shown in Fig. 2 the device includes：
Laminating module 22, is carried out for the sending signal at least two user equipmenies by after power distribution
Superposed transmission；
HARQ scheduler modules 24, the ACK/NACK for receiving at least two user equipmenies feedback, and
Determine whether to be retransmitted according to ACK/NACK and the mode for retransmitting is determined in the case where needing to retransmit.
As an optional implementation method, in the case where user equipment is two user equipmenies, HARQ
The ACK/NACK of the remote user equipment feedback that scheduler module 24 is used to receive in user equipment, wherein, far
User equipment feeds back the ACK/NACK of its own；During HARQ scheduler modules 24 are used to receive user equipment
Nearly user equipment feedback ACK/NACK, wherein, it is corresponding that nearly user equipment feeds back remote user equipment
The ACK/NACK and corresponding ACK/NACK of nearly user equipment；Distance phase of the nearly user equipment apart from base station
For remote user equipment apart from the closer to the distance of base station, nearly user equipment receives letter using interference cancellation receiver
Number.
Used as an optional implementation method, HARQ scheduler modules 24 are used for what basis was received
ACK/NACK determines whether error of transmission is caused by interlayer interference；If error of transmission is caused by interlayer interference,
Then HARQ scheduler modules 24 are used to determine to be retransmitted using orthogonal transmission；Otherwise, HARQ processes mould
Block 24 is used to determine to be retransmitted using MUST.
As an optional implementation method, the feelings of nearly user equipment and remote user equipment are included in user equipment
Under condition, HARQ scheduler modules 24 determine whether the side for retransmitting and determining to retransmit according to ACK/NACK
Formula includes at least one of：Nearly user equipment feeds back remote user equipment feedback NACK and nearly user equipment
Feeding back ACK, remote user equipment feeds back NACK, it is determined that being retransmitted using MUST；Nearly user equipment
Remote user equipment feeding back ACK and nearly user equipment feeding back ACK are fed back, remote user equipment feeds back NACK,
It is determined that being retransmitted using MUST；Nearly user equipment feeds back remote user equipment feeding back ACK and nearly user sets
Standby feedback NACK, remote user equipment feeds back NACK, it is determined that being retransmitted using MUST；Nearly user
Equipment feeds back remote user equipment feeding back ACK and nearly user equipment feedback NACK, remote user equipment feedback
ACK, it is determined that being retransmitted using MUST；Nearly user equipment feed back remote user equipment feedback NACK and
Nearly user equipment feedback NACK, remote user equipment feeding back ACK, it is determined that being retransmitted using orthogonal transmission；
Nearly user equipment feeds back remote user equipment feedback NACK and nearly user equipment feedback NACK, and remote user sets
Standby feedback NACK, it is determined that being retransmitted again afterwards using being modified to MUST；When using amendment
After MUST is retransmitted, nearly user equipment feeds back remote user equipment feedback NACK and nearly user equipment feedback
NACK, remote user equipment feeds back NACK, it is determined that being retransmitted using orthogonal transmission；Nearly user equipment is anti-
Present remote user equipment feedback NACK and nearly user equipment feeding back ACK, remote user equipment feeding back ACK, really
Surely need not be retransmitted；Nearly user equipment feeds back remote user equipment feeding back ACK and nearly user equipment feedback
ACK, remote user equipment feeding back ACK, it is determined that need not be retransmitted.
Used as an optional implementation method, the signal of the superposition of laminating module 22 is expressed as：
Wherein, 0<α<1 is power splitting factor, sNAnd sFThe hair of nearly user equipment and remote user equipment is represented respectively
Send symbol sebolic addressing.
Illustrated with reference to an optional embodiment.
The present embodiment proposes a kind of multi-user's HARQ retransmission schemes that can apply to MUST systems,
The efficiency that HARQ is retransmitted is improve on the basis of accuracy ensureing to retransmit.
In MUST schemes, eNB can will match user sending signal by appropriate power distribution it
After be superimposed and be transmitted, by taking the direct overlaying scheme of two users as an example, the sending signal of base station side can
To be expressed as：
Wherein, 0<α<1 is power splitting factor, sNAnd sFThe transmission of nearly user and remote user is represented respectively
Symbol sebolic addressing.Assuming that superposition user uses identical precoding p, then the reception signal of far and near user can divide
It is not expressed as：
Wherein, HNAnd HFBase station to the channel matrix of far and near user, n are represented respectivelyNAnd nFRepresent respectively remote
The noise of nearly user.
For remote user, can directly nearly the signal of user regard noise processed.Now remote user only
The ACK/NACK information of oneself can be fed back.For nearly user, when nearly user is connect using interference elimination
During receipts machine, such as code word level Interference Cancellation (CWIC) receiver.Nearly user needs first to decode remote user's
Signal, carries out interference elimination afterwards, and finally to nearly user, the signal of itself is decoded again.Therefore, for
Two ACK/NACK information can be simultaneously fed back for nearly user, remote user and nearly user is corresponded respectively to.
When nearly user or remote user feedback are NACK, show its decoding failure, it is necessary to carry out data weight
Pass, now there is two kinds of retransmission schemes：MUST is retransmitted and orthogonal retransmission.If only one of which user
During bust this, data to be transmitted is the re-transmission data and the new data for being properly received signal of decoded in error user.
If two users' simultaneous transmission fails, data to be transmitted is the re-transmission data of two users.If selection MUST weights
Pass, then data to be transmitted is stacked up in MUST modes and transmit together.If selection orthogonal retransmission,
Data to be transmitted can be transmitted according to orthogonal manner, and specific mode includes：Provided by different time-frequencies
Transmit or MU-MIMO transmission is carried out using different precodings in source.
Selecting a cardinal principle of which kind of retransmission scheme is：Farthest improve and retransmit the probability of success.It is right
For remote user, always nearly the signal of user treats as noise processed, therefore nearly interference of the user to remote user
It is mainly reflected in power distribution, α is bigger, interference of the nearly user to remote user is bigger.And for nearly use
Two classes are broadly divided into for family, the reason for bust this：Due to the error of transmission that user's interlayer interference causes,
If now selection MUST is retransmitted, due to user's interlayer interference cannot be eliminated, the probability of error is retransmitted still
Than larger.Another kind of reason is that mutation, deep fade and the MCS of channel select the reason such as improper to cause
Bust this.Now can just be retransmitted using MUST modes.
Based on above-mentioned analysis, following table is given after base station obtains the feedback information of far and near user, can be taken
Re-transmission or transmission strategy.
And for HARQ Class1 and 2, remote user's decoding failure, nearly user's successfully decoded.Therefore for
For nearly user, the decoding for not causing nearly user in the absence of user's interlayer interference or user's interlayer interference fails,
Therefore the new data of the re-transmission data of remote user and nearly user can be overlapped transmission with MUST modes.
For HARQ types 3 and 4, although nearly user's decoding failure, but nearly user can successfully solve
The data of the remote user of code, therefore do not exist user's interlayer interference for nearly user, MUST can be used
Mode is retransmitted.When the dual-purpose failure of decoding per family, the re-transmission data of two users are folded in MUST modes
Plus transmission.When nearly user decode fail, during remote user's successfully decoded, can nearly the re-transmission data of user and
The new data of remote user is overlapped transmission in MUST modes.
For HARQ types 5, nearly user decodes not successfully to remote user data and its data, mainly
Reason is likely to user's interlayer interference.But remote user is successfully decoded, in order to ensure that nearly user can successfully solve
Code retransmits data, and the re-transmission data of nearly user and the new data of remote user orthogonal manner are transmitted, can used
Different running time-frequency resources or different precodings.
For HARQ types 6 and 7, distance decoding failure per family, while nearly user also fails to successfully solve
The remote user data of code.Wherein HARQ types 6 are primarily adapted for use in the far and near situation for just passing failure per family.
For at this point for nearly user, the interference of remote user is just still present in biography data, in order to improve retransmission efficiency,
And the interference of remote user is eliminated in first time retransmits, retransmitting data to first time of two users is carried out accordingly
Adjustment.The re-transmission data of nearly user are still sN, the re-transmission data of remote user are changed into-sF.Corresponding first time
Retransmitting signal can be expressed asThe first time that will be received for nearly user retransmits letter
Number and just pass the interference of remote user can be eliminated after signal merges.If retransmitting two users for the first time still to decode
Failure, and nearly user cannot still decode remote subscriber signal, then carry out second re-transmission using orthogonal manner.
For HARQ types 8 and 9, due to far and near with being fed back to ACK per family, therefore two users
Data need not all be retransmitted, and directly send next data block with MUST modes.
In the present embodiment when nearly user uses Interference Cancellation class receiver, nearly user feeds back remote user simultaneously
With the ACK/NACK states of nearly user.ENB according to the ACK/NACK information of remote user feedback and
The ACK/NACK information of the far and near user that nearly user feeds back simultaneously is come the retransmission scheme that determines to be used in retransmitting.
The multi-user HARQ that the present embodiment can apply to MUST systems is retransmitted, and is ensureing to retransmit correctly
The efficiency of HARQ re-transmissions is improve on the basis of rate.
The preferred embodiments of the present invention are these are only, is not intended to limit the invention, for this area
For technical staff, the present invention can have various modifications and variations.It is all within the spirit and principles in the present invention,
Any modification, equivalent substitution and improvements made etc., should be included within the scope of the present invention.
Claims (10)
1. a kind of data transmission method, it is characterised in that including：
Base station is to the sending signal of at least two user equipmenies by being overlapped transmission after power distribution；
The ACK/NACK of the base station reception at least two user equipmenies feedback, and according to
ACK/NACK determines whether to be retransmitted and determined in the case where needing to retransmit the mode for retransmitting.
2. method according to claim 1, it is characterised in that in the user equipment be two use
In the case of the equipment of family, the ACK/NACK that the base station receives described two user equipment feedbacks includes：
The base station receives the ACK/NACK of the remote user equipment feedback in the user equipment, wherein,
The remote user equipment feeds back the ACK/NACK of its own；
The base station receives the ACK/NACK of the nearly user equipment feedback in the user equipment, wherein,
Nearly user equipment the feedback remote corresponding ACK/NACK of user equipment and the nearly user equipment pair
The ACK/NACK for answering；Distance of the nearly user equipment apart from the base station sets relative to the remote user
For apart from the closer to the distance of the base station, the nearly user equipment receives signal using interference cancellation receiver.
3. method according to claim 1 and 2, it is characterised in that the base station is according to two users
The ACK/NACK of equipment feedback determines whether to be retransmitted and determined in the case where needing to retransmit to retransmit
Mode include：
The base station determines whether error of transmission is caused by interlayer interference according to the ACK/NACK for receiving；
If error of transmission is caused by interlayer interference, the base station determines to be retransmitted using orthogonal transmission；It is no
Then, the base station determines to be retransmitted using MUST.
4. method according to claim 3, it is characterised in that include nearly use in the user equipment
In the case of family equipment and remote user equipment, the ACK/NACK that the base station is fed back according to two users' equipment
Determine whether to retransmit and determine that the mode for retransmitting includes at least one of：
The nearly user equipment feedback remote user equipment feedback NACK and the nearly user equipment feedback
ACK, the remote user equipment feedback NACK, the base station determines to be retransmitted using MUST；
The nearly user equipment feeds back the remote user equipment feeding back ACK and the nearly user equipment feedback
ACK, the remote user equipment feedback NACK, the base station determines to be retransmitted using MUST；
The nearly user equipment feeds back the remote user equipment feeding back ACK and the nearly user equipment feedback
NACK, the remote user equipment feedback NACK, the base station determines to be retransmitted using MUST；
The nearly user equipment feeds back the remote user equipment feeding back ACK and the nearly user equipment feedback
NACK, the remote user equipment feeding back ACK, the base station determines to be retransmitted using MUST；
The nearly user equipment feedback remote user equipment feedback NACK and the nearly user equipment feedback
NACK, the remote user equipment feeding back ACK, the base station determines to be retransmitted using orthogonal transmission；
The nearly user equipment feedback remote user equipment feedback NACK and the nearly user equipment feedback
NACK, the remote user equipment feedback NACK, the base station determination is used and is modified it to MUST
Retransmitted again afterwards；
After being retransmitted using the MUST of amendment, it is anti-that the nearly user equipment feeds back the remote user equipment
The feedback NACK and nearly user equipment feedback NACK, the remote user equipment feedback NACK, it is described
Base station determines to be retransmitted using orthogonal transmission；
The nearly user equipment feedback remote user equipment feedback NACK and the nearly user equipment feedback
ACK, the remote user equipment feeding back ACK, the base station determines to be retransmitted；
The nearly user equipment feeds back the remote user equipment feeding back ACK and the nearly user equipment feedback
ACK, the remote user equipment feeding back ACK, the base station determines to be retransmitted.
5. method according to any one of claim 1 to 4, it is characterised in that the base station pair
Two sending signals of user equipment include by being overlapped transmission after power distribution：
The signal that the base station sends is expressed as：Wherein, 0<α<1 divides for power
The factor, sNAnd sFThe transmission symbol sebolic addressing of nearly user equipment and remote user equipment is represented respectively.
6. a kind of data transmission device, it is characterised in that in base station, including：
Laminating module, for the sending signal at least two user equipmenies by being folded after power distribution
Plus transmission；
HAQR scheduler modules, the ACK/NACK for receiving at least two user equipmenies feedback,
And determined whether to be retransmitted and the determination weight in the case where needing to retransmit according to the ACK/NACK of feedback
The mode of biography.
7. device according to claim 1, it is characterised in that in the user equipment be two use
In the case of the equipment of family,
The HARQ scheduler modules receive the remote user equipment feedback in the user equipment
ACK/NACK, wherein, the remote user equipment feeds back the ACK/NACK of its own；
The HARQ scheduler modules receive the nearly user equipment feedback in the user equipment
ACK/NACK, wherein, the nearly user equipment feeds back the corresponding ACK/NACK of the remote user equipment
ACK/NACK corresponding with the nearly user equipment；Distance of the nearly user equipment apart from the base station
Relative to the remote user equipment apart from the closer to the distance of the base station, the nearly user equipment is supported using interference
The receiver that disappears receives signal.
8. the device according to claim 6 or 7, it is characterised in that
The HARQ scheduler modules be used for according to the ACK/NACK that receives determine error of transmission whether by
Interlayer interference causes；
If error of transmission is caused by interlayer interference, the determining module is used to determine to be carried out using orthogonal transmission
Retransmit；Otherwise, the determining module is used to determine to be retransmitted using MUST.
9. device according to claim 8, it is characterised in that include nearly use in the user equipment
In the case of family equipment and remote user equipment, the determining module determines whether to retransmit according to ACK/NACK
And determine that the mode for retransmitting includes at least one of：
The nearly user equipment feedback remote user equipment feedback NACK and the nearly user equipment feedback
ACK, the remote user equipment feedback NACK, it is determined that being retransmitted using MUST；
The nearly user equipment feeds back the remote user equipment feeding back ACK and the nearly user equipment feedback
ACK, the remote user equipment feedback NACK, it is determined that being retransmitted using MUST；
The nearly user equipment feeds back the remote user equipment feeding back ACK and the nearly user equipment feedback
NACK, the remote user equipment feedback NACK, it is determined that being retransmitted using MUST；
The nearly user equipment feeds back the remote user equipment feeding back ACK and the nearly user equipment feedback
NACK, the remote user equipment feeding back ACK, it is determined that being retransmitted using MUST；
The nearly user equipment feedback remote user equipment feedback NACK and the nearly user equipment feedback
NACK, the remote user equipment feeding back ACK, it is determined that being retransmitted using orthogonal transmission；
The nearly user equipment feedback remote user equipment feedback NACK and the nearly user equipment feedback
NACK, the remote user equipment feedback NACK, it is determined that being carried out again afterwards using being modified to MUST
Retransmit；
After being retransmitted using the MUST of amendment, it is anti-that the nearly user equipment feeds back the remote user equipment
Feedback NACK and the nearly user equipment feedback NACK, the remote user equipment feedback NACK, it is determined that
Retransmitted using orthogonal transmission；
The nearly user equipment feedback remote user equipment feedback NACK and the nearly user equipment feedback
ACK, the remote user equipment feeding back ACK, it is determined that need not be retransmitted；
The nearly user equipment feeds back the remote user equipment feeding back ACK and the nearly user equipment feedback
ACK, the remote user equipment feeding back ACK, it is determined that need not be retransmitted.
10. the device according to any one of claim 6 to 9, it is characterised in that
The signal of the laminating module superposition is expressed as：Wherein, 0<α<1 is work(
Rate splitting factor, sNAnd sFThe transmission symbol sebolic addressing of nearly user equipment and remote user equipment is represented respectively.
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| CN201511021102.2A CN106936547B (en) | 2015-12-30 | 2015-12-30 | Data transmission method and device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111510259A (en) * | 2020-03-19 | 2020-08-07 | 西安电子科技大学 | Novel retransmission method based on ultra-reliable low-delay communication and NOMA (non-orthogonal multiple Access) technology |
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| CN102571307A (en) * | 2012-01-16 | 2012-07-11 | 中兴通讯股份有限公司 | Adaptive hybrid automatic repeat request (HARQ) method and device for multi-user multi-input multi-output (MIMO) system |
| CN106301701A (en) * | 2015-05-12 | 2017-01-04 | 上海贝尔股份有限公司 | For the method and apparatus improving HARQ process in MUST system |
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2015
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| CN102571307A (en) * | 2012-01-16 | 2012-07-11 | 中兴通讯股份有限公司 | Adaptive hybrid automatic repeat request (HARQ) method and device for multi-user multi-input multi-output (MIMO) system |
| CN106301701A (en) * | 2015-05-12 | 2017-01-04 | 上海贝尔股份有限公司 | For the method and apparatus improving HARQ process in MUST system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111510259A (en) * | 2020-03-19 | 2020-08-07 | 西安电子科技大学 | Novel retransmission method based on ultra-reliable low-delay communication and NOMA (non-orthogonal multiple Access) technology |
| CN111510259B (en) * | 2020-03-19 | 2021-07-13 | 西安电子科技大学 | Novel retransmission method based on ultra-reliable low-delay communication and NOMA (non-orthogonal multiple Access) technology |
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