CN104113400B - Mixed automatic retransferring method and frequency scheduling method in dual path D2D systems - Google Patents
Mixed automatic retransferring method and frequency scheduling method in dual path D2D systems Download PDFInfo
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Abstract
According to the present invention, a kind of dual path equipment that is used for is proposed to the mixed automatic retransferring method in equipment D2D systems, in the dual path D2D systems, data alternately are sent to purpose D2D equipment by two assisting user equipments respectively from source D2D equipment, the mixed automatic retransferring method includes：When reaching that predetermined number of times is still failed to the re-transmission of the data of purpose D2D equipment from an assisting user equipment in two assisting user equipments, the data are retransmitted and hand to another assisting user equipment to perform.
Description
Technical field
The present invention relates to wireless communication technology field, and in particular to one kind is used for dual path equipment to equipment (D2D) system
In mixed automatic retransferring method, frequency scheduling method, control device and D2D equipment, it is possible to increase the availability of frequency spectrum of system,
And time interval resource can be made full use of, mitigate D2D burden for users, improve the diversity gain of system.
Background technology
In order to meet people to radio communication service increasing need, next generation mobile communication system needs to provide more
High transmission rate and more reliable transmission performance.Future wireless system network will be a support various wireless communication system
Heterogeneous communications network, it is desirable to have bigger network coverage, but improve wireless network using the method for base station is increased
Coverage will greatly improve the cost of operator.In addition, closely data sharing between social networks, friend, local wide
The prevalence for the application such as accusing causes near the right solution of people things interested and the demand communicated gradually increases, meanwhile,
The poor place of some network coverages, cooperating relay is carried out using neighbouring mobile phone terminal, and it is also one to keep the communication with base station
Plant means of communication.
Cooperation communication system has become the heat of communications field research in recent years as a kind of extension of multi-antenna technology
Point, it will improve one of key technology of network coverage as future mobile communication system.Utilize the section in wireless network
Point, which cooperates transmission data or adds special via node, not only can effectively expand wireless network coverage, also
The great amount of cost that increase base station is brought can be effectively reduced.Dual path D2D systems as be described hereinafter.It is logical relative to traditional honeycomb
Letter pattern, D2D systems are applied to use apart near user with terminal, and so power request transmission can be subtracted just than relatively low
Few consumption to end cell.But if it is desirable that comparatively two somewhat remote users of distance can also use low-power
It if being in communication with each other, just must be introduced into auxiliary user to help them to communicate, reach the mesh of increase D2D network coverages
's.But if we are only with an auxiliary user, the communication efficiency of D2D user can be reduced, because terminal user is general
All be operated under semiduplex pattern, i.e., can not be simultaneously with frequency transceiving data, so when auxiliary user is in forwarding D2D user data
When, D2D user must could send next data after auxiliary user is sent, this communication higher to delay requirement
It is a shortcoming for needing to overcome for business.
Found through being retrieved to existing literature, " Spectral efficient protocols for half duplex
Fading relay channel ", IEEE Journal on Selected Areas in Communications,
Vol.25, No.2,2011. are proposed and disappeared with serial interference this article describes the host-host protocol of dual path relay system
The interference problem of relay well is eliminated except technology.Empirical tests, the host-host protocol of this article can improve system spectrum utilization rate, improve
System efficiency of transmission.This patent, is exactly that this dual path system is introduced into D2D systems, to solve the problem of communication efficiency is low.
Two auxiliary users (user 3 and user 4) in the dual path D2D systems of this patent are to alternate forwarding to come from
The data of D2D user (user 1 or user 2), send data instance with user 1 to user 2 herein, so when one of auxiliary
While user forwards data, user 1 can also send data to another auxiliary user, and such user 1 can send always
Data are without waiting.The mode of operation of this dual path system can largely make up the frequency spectrum effect of single-path system
Rate is lost.
However, this dual path D2D systems also bring some problems while bringing spectrum efficiency performance to improve, e.g., use
Family 1 should be identical in the frequency resource that synchronization transmission data are used with one of auxiliary user, such ability
Making the cooperation of two auxiliary users turns into a virtual full duplex auxiliary user, you can with simultaneously with frequency transceiving data, really
Reach the purpose for improving spectrum efficiency.Another problem is exactly that dual path system is relative to single-path system, number of links increase
, this improves the outage probability of system, causes destination node to decode unsuccessful probability and increases, be i.e. bad stability.
The content of the invention
In order to overcome the drawbacks described above of prior art to propose the present invention.It is therefore an object of the present invention to propose a kind of use
Mixed automatic retransferring method, frequency scheduling method, control device and the D2D in equipment (D2D) system are set in dual path equipment
It is standby, it is possible to increase the availability of frequency spectrum of system, and time interval resource can be made full use of, mitigate D2D burden for users, improve system
Diversity gain.
To achieve these goals, according to the invention it is proposed that a kind of dual path equipment that is used for is in equipment D2D systems
Mixed automatic retransferring method, in the dual path D2D systems, is handed over by two assisting user equipments respectively from source D2D equipment
Data are sent for purpose D2D equipment, the mixed automatic retransferring method includes：From one in two assisting user equipments
Data from assisting user equipment to purpose D2D equipment retransmit reach that predetermined number of times is still failed when, by the data retransmit turn
Another assisting user equipment is given to perform.
Preferably, when data re-transmission is handed into another assisting user equipment to perform, another auxiliary is used
What family equipment utilization was received by serial interference elimination receiver from one assisting user equipment retransmits with the data
Related data retransmit to perform the data.
Preferably, when data re-transmission is handed into another assisting user equipment to perform, another auxiliary is used
Family equipment is according to the data related to data re-transmission received from source user equipment and shows that the data are from institute
The designator for the data that assisting user equipment transfer comes is stated, is retransmitted to perform the data.
In addition, according to the invention it is proposed that a kind of dual path equipment that is used for is to the frequency scheduling side in equipment D2D systems
Method, in the dual path D2D systems, from source D2D equipment respectively by two assisting user equipments alternately to purpose D2D equipment
Data are sent, the frequency scheduling method includes：From an assisting user equipment in two assisting user equipments to another auxiliary
Help user equipment, the source D2D equipment and purpose D2D device broadcasts downlink distribution control signaling, the descending chain
Road distribution control signaling at least includes：System synchronous information and one assisting user equipment are provided in the transmission of next time slot
The information of source block；It is and one auxiliary and the source D2D equipment distributes control signaling according to the downlink that receives
Help user equipment is simultaneously same to send data frequently.
Preferably, the downlink distribution control signaling also includes：Set from source D2D equipment to one auxiliary user
Standby channel estimation results.
Preferably, the channel estimation results are sent to one assisting user equipment using from source D2D equipment
Reference signal is obtained.
In addition, according to the invention it is proposed that it is a kind of in dual path equipment to the mixed automatic retransfer in equipment D2D systems
Control device, in the dual path D2D systems, from source D2D equipment respectively by two assisting user equipments alternately to purpose
D2D equipment sends data, and the control device includes：From an assisting user equipment in two assisting user equipments to mesh
The data of D2D equipment retransmit when reaching that predetermined number of times is still failed, the data are retransmitted and hand to another auxiliary user
Equipment is come the unit that performs.
In addition, according to the invention it is proposed that a kind of dual path equipment that is used for is to the D2D equipment in equipment D2D systems, in institute
State in dual path D2D systems, alternately sent respectively by two assisting user equipments to another D2D equipment from the D2D equipment
Data, the D2D equipment includes：Receive the downlink from the assisting user equipment broadcast in two assisting user equipments
The unit of control signaling is distributed, the downlink distribution control signaling at least includes：System synchronous information and one auxiliary
User equipment is helped in the information of the transmission resource block of next time slot；And according to the downlink distribution control letter received
Order, with one assisting user equipment simultaneously with the unit for sending data frequently.
It is an advantage of the current invention that special control signaling (downlink distribution control signaling) is used for frequency scheduling and same
Step, the frequency resource that this control signaling is indicated is determined by the channel condition information of each channel, when channel condition information changes
During change, transmission frequency can also make corresponding changes, and can so make full use of channel information, auxiliary by the frequency scheduling method
User 3 and auxiliary user 4 is helped to alternate transmission data, user 1 can continuously transmit data, and and auxiliary user job
In in same frequency resource, the availability of frequency spectrum of system can be so improved.In addition, the repeating method of the present invention is suitable for LTE
System, can make full use of time interval resource, mitigate D2D burden for users, improve the diversity gain of system.
Brief description of the drawings
By illustrating the preferred embodiments of the present invention below in conjunction with the accompanying drawings, above and other purpose, the spy of the present invention will be made
Advantage of seeking peace is clearer, wherein：
Fig. 1 is the illustraton of model of dual path D2D systems；
Fig. 2 is the time slot distribution block diagram that dual path D2D systems send data；
Fig. 3 is the flow chart of dual path D2D system frequency dispatching methods；
Fig. 4 is the flow chart of dual path D2D system mixed automatic retransferring methods；
Fig. 5 is dual path D2D systems from source D2D user to the HARQ protocol design frame chart of auxiliary user；
Fig. 6 is HARQ protocol design frame chart of the dual path D2D systems from auxiliary user to purpose D2D user；
Fig. 7 is the assisting user equipment block diagram of the present invention；
Fig. 8 is the D2D user equipment block diagrams of the present invention.
Embodiment
Below with reference to accompanying drawings to a preferred embodiment of the present invention will be described in detail, eliminate in the course of the description for
It is unnecessary details and function for the present invention, to prevent the understanding of the present invention from causing to obscure.
Fig. 1 is the system model figure of the present invention, i.e. dual path D2D systems mode figure, and it is by a base station
(noticing that this base station can also not have, be such as applied to the D2D systems under public safety scene), (user sets two D2D user equipmenies
For 1 and user equipment 2) and two assisting user equipments (user equipment 3 and user equipment 4) compositions.In embodiments of the invention
In, it will be assumed that D2D user equipmenies do not have direct link because of reasons such as distant or shadow effects, between them, that is, use
The data of family equipment 1 must can just be communicated to user equipment 2 by the auxiliary of user equipment 3 and user equipment 4.Can be with from figure
Find out, whole dual path D2D systems are controlled by base station, the discovery, connection mainly to D2D system equipments are set up and resource
Distribution etc. is controlled.When user equipment 4 forwards the data that receive of last time to user equipment 2, user equipment 1 is sent data to
User equipment 3, and when user equipment 3 forwards the data that receive of last time to user equipment 2, user equipment 1 sends data to use
Family equipment 4.Under this operating protocol, because the forwarding that two assisting user equipments are alternated comes from the data of user equipment 1,
User equipment 1 is constantly in transmission data mode, can so greatly improve the operational efficiency availability of frequency spectrum of system.
Come the job step of dual path D2D systems in the present invention under specific description, in fig. 2, TS tables below in conjunction with Fig. 2
Show the node in time slot, ND expression systems, T represents that now node is in and sends data mode, and R represents that now node is in and received
Data mode, " -- " represents that now node is in idle condition.Mainly include the following steps that：
Time slot 1, user equipment 1 sends data to user equipment 3, and now user equipment 3 is due to without the number for needing to forward
According in idle condition；Time slot 2, user equipment 1 sends data to user equipment 4, the successfully decoded of 3 forwarding time slot of user equipment 1
Data to user equipment 2；Time slot 3, user equipment 1 sends data to user equipment 3, and the forwarding time slot 2 of user equipment 4 is decoded into
The data of work(are so gone down repeatedly to user equipment 2, until (n+1)th time slot (assuming that n is odd number), when user equipment 3 is forwarded
The data of gap n successfully decodeds are to user equipment 2, and such n data complete transmission in n+1 time slot.
The basic skills for realizing the scheduling of dual path D2D system frequencies is provided referring to Fig. 3.
Such as Fig. 3, first, in the first step, D2D systems apply for cell uplink frequency resource, D2D systems and honeycomb to base station
Network share Radio Resource, improves cell spectrum utilization rate.After resource bid is arrived, D2D system multiplexing cell uplinks resource is carried out
Data transfer.Then user equipment 1 sends RSs (reference signal) to user equipment 4.
Then, in second step, based on the RSs received, user equipment 4 carries out channel estimation, obtains user equipment 1 and use
Channel estimation results between family equipment 4, and feed back to user equipment 3.User equipment 2 sends RSs to user equipment 3, Yong Hushe
Standby 1 also sends RSs to user equipment 3.
Then, in the third step, user equipment 3 is raw according to feedback information and channel estimation results from user equipment 4
Control signaling is distributed into a downlink and is broadcast to user equipment 1, user equipment 4 and user equipment 2, this downlink point
Included with control signaling：System synchronous information, user equipment 1 arrive the channel estimation results and user equipment 3 of user equipment 3
In information such as the information (frequency resource) of transmission resource block of next time slot, here, in the frequency of the transmission resource block of next time slot
Rate resource is according between the channel estimation results between user equipment 1 and user equipment 4 and user equipment 2 and user equipment 3
Channel estimation results determine.User equipment 1 and user equipment 2 each send a RSs to user equipment 4.
Then, in the 4th step, the system synchronous information and user equipment 3 in the control signaling received are next
The information of the transmission resource block of time slot, user equipment 1 will be with user equipment 3 while same frequency sending data.User equipment 4 according to work as
User equipment 1 in preceding channel estimation results and control signaling arrives the channel estimation results of user equipment 3, and generation one is descending
Link distribute control signaling, specifically with it is like above, will not be repeated here.
Then, in the 5th step, the downlink distribution control signaling of the broadcast generation of user equipment 4 is to user equipment 1, use
Family equipment 3 and user equipment 2, this downlink distribution control signaling arrive user equipment comprising system synchronous information, user equipment 1
4 channel estimation results and user equipment 4 are in information such as the transmission resource blocks of next time slot.User equipment 1 and user equipment 2 are each
From a RSs is sent to user equipment 3.
Then, the 3rd step is returned in the 6th step, similar work is repeated until data transfer is completed.
Illustrate mixed automatic retransferring method in dual path D2D systems referring to Fig. 4.
Fig. 4 is a flow chart of mixed automatic retransfer agreement in the present invention.First, first in the first step, system jumps
(sending user equipment 1 to assisting user equipment from D2D) bust this, is set by assisting user equipment feeding back ACK/NACK to user
Standby 1, user equipment 1 retransmits data until sending successfully or reaching maximum retransmission.Step is as follows：
Time slot n：User equipment 1 sends data to user equipment 3；
Time slot n+1：User equipment 1 receives the ACK/NACK feedback informations from user equipment 3.
Time slot n+2：User equipment 1 sends a new data to user equipment 4.
Time slot n+3：User equipment 1 receives the ACK/NACK feedback informations from user equipment 4.
Time slot n+4：If user equipment 1 is received in time slot n+1, that come is ACK, user equipment 1 will send new data to
Family equipment 3, otherwise retransmits the data to user equipment 3.
Then, second in second step, system jumps the bust this (from assisting user equipment to purpose D2D user equipmenies 2),
By 2 feeding back ACKs of user equipment/NACK to assisting user equipment, assisting user equipment be responsible for retransmit data until send successfully or
Reach maximum retransmission.Step is as follows：
Time slot n：User equipment 3 receives the useful data from user equipment 1 and the interference data from user equipment 4,
User equipment 3 decodes the data received using serial interference elimination receiver, and the useful data decoded is stored in into useful number
According to buffer storage, interference data are stored in interference Data Buffer Memory.
Time slot n+1：3 feeding back ACKs of user equipment/NACK is to user equipment 1.
Time slot n+2：If the successfully decoded of user equipment 3, by the data broadcasting of successfully decoded to user equipment 2 and user
Equipment 4, if decoding failure, does not forward this to decode miss data, and be stored in useful data buffer storage.
Time slot n+3：2 feeding back ACKs of user equipment/NACK is to user equipment 3.
Time slot n+4：If user equipment 3 receives NACK, user equipment 3 will retransmit the data to user equipment 2.
Time slot n+5：2 feeding back ACKs of user equipment/NACK is to user equipment 3.
Time slot n+6：If user equipment 3 is received again by NACK, user equipment 3 will send a new data, described
The task that data are retransmitted will be forwarded to user equipment 4, because user equipment 4 in time slot n+2 passes through serial interference elimination receiver
The data are have received, and incorporate interference Data Buffer Memory.
Although delivering data to user equipment 4 it is pointed out here that there is described herein when receiving NACK for the second time
The task of re-transmission, but the invention is not restricted to this, but the rear to user equipment 4 of the NACK of any pre-determined number can received
Deliver the task of data re-transmission.
Time slot n+7：User equipment 2 feeds back the NACK with the data correlation to user equipment 4.
Time slot n+8：User equipment 4 retransmits the data to user equipment 2, until user equipment 2 is properly received or is reached
Maximum retransmission.
Above-mentioned time slot n+7 main purpose is notifying user equipment 4, it is known that user equipment 3 arrives the chain of user equipment 2
Road is second-rate, data transmission fails, needs the related data of its adapter user equipment 3 to transmit, there is three kinds of differences to this present invention
Specific embodiment：
Scheme 1：User equipment 3 notifies the information of data transmission fails to user equipment 1, and then user equipment 1 is again
The data are transmitted to user equipment 4, and add a new data to indicate (NDI) on the data, NDI is -1, implies that this is
The data come are shifted from user equipment 3.Note, in the case of this scheme, serial interference receiver is just not necessarily
.
Scheme 2：The first aspect frequency scheduling of this patent is combined with second aspect mixed automatic retransfer agreement, user
The ACK/NACK attendant messages of the data in its next dispatch, and are broadcast to user equipment 4 by equipment 3.Note,
This scheme need to add the id information of each bag.
Scheme 3：This scheme is a simplest scheme, i.e., user equipment 4, which is also detected from user equipment 2, feeds back to user
The ACK/NACK information of equipment 3, because user equipment 4 knows related schedule information, therefore he can be inferred to the ACK/ of user equipment 2
Nack message.
Thus, assisted according to the present invention there is provided a kind of frequency scheduling for dual path D2D systems and mixed automatic retransfer
View, comprises the following steps：For frequency scheduling agreement, user equipment 3 produces frequency scheduling control signaling simultaneously in its controller
User equipment 1, user equipment 4 and user equipment 2 are broadcast to, this described next time of signaling instruction user equipment 3 sends data and adopted
Frequency information and system synchronous information；User equipment 1 is provided in specified frequency simultaneously according to the signaling and user equipment 3
Data are sent on source, scheduling is completed.For mixed automatic retransfer agreement, user equipment 1 sends data to user equipment 3；User
CRC check code of the equipment 3 in data judges whether data decoding succeeds, and feeding back ACK/NACK is to user equipment 1；User
Equipment 1 sends new data to user equipment 4；User equipment 4 in data CRC check code judge data decode whether into
Work(, and feeding back ACK/NACK is to user equipment 1；User equipment 1 determines it is to send new data according to the ACK/NACK information received
Or data are retransmitted to user equipment 3；User equipment 3 receives useful data from user equipment 1 and from user equipment 4
Data are disturbed, the data received are decoded by serial interference elimination receiver, and useful data is stored in useful data and are delayed
Memory is rushed, interference data storage is in interference Data Buffer Memory；3 feeding back ACKs of user equipment/NACK is to user equipment 1；If
The successfully decoded of user equipment 3 then broadcasts this data to user equipment 2 and user equipment 4, if decoding failure, does not forward this to decode
Miss data；2 feeding back ACKs of user equipment/NACK is to user equipment 3；If user equipment 3 receives NACK, user equipment 3 will weight
Data are passed to user equipment 2；2 feeding back ACKs of user equipment/NACK is to user equipment 3；If user equipment 3 is received again by NACK,
User equipment 3 no longer retransmits this data but sends a new data, and user equipment 4 is given the re-transmission task of this data；
User equipment 2 feeds back the NACK of one and the data correlation to user equipment 4；User equipment 4 retransmit the data until with
Family equipment 2 is properly received or reached maximum retransmission.The retransmission protocol of the present invention refers to the retransmission protocol in LTE system, energy
Time interval resource is made full use of, mitigates equipment to user equipment burden, and the diversity gain of system can be improved.
Referring to Fig. 5, Fig. 6, Fig. 7 and Fig. 8 to the D2D user equipmenies and assisting user equipment in dual path D2D systems
Embodiment illustrate.Said frequencies are dispatched and the operating procedure of mixed automatic retransfer protocol transmission method can be by following
Each functional unit in the D2D user equipmenies and assisting user equipment of description is realized.
Fig. 5 shows the HARQ protocol design frame chart from source D2D user equipmenies to assisting user equipment of the present invention.
Such as Fig. 7, assisting user equipment unit includes：Data transceiving unit, signaling receiving and transmission unit, controller unit, buffer-stored
Device unit.
Data transceiving unit is configured as, and receives the data from source D2D user equipmenies, forwards data to purpose D2D use
Family equipment.
Signaling receiving and transmission unit is configured as, and is fed back and is received ACK/NACK, the information such as frequency scheduling.
Controller unit is configured as, and produces frequency scheduling signaling, and the life of ACK/NACK signalings is indicated according to decoding cases
Into.
Buffer storage location is configured as, the data that interim storage is received, the storage decoding of useful data buffer storage
The useful data of success or failure, the data of storage successfully decoded are used to retransmit, and the data of storage decoding failure are used for and re-transmission
Data merge decoding, interference data of the interference Data Buffer Memory storage from another assisting user equipment, for when another
Assisting user equipment link-quality helps it to retransmit related data when poor.
Such as Fig. 8, D2D user equipment units include：Data transceiving unit, signaling receiving and transmission unit, controller unit delays
Rush memory cell, data processing memory unit.
Data transceiving unit is configured as, and receives and send data.
Signaling receiving and transmission unit is configured as, and is fed back and is received ACK/NACK, the information such as frequency scheduling.
Controller unit is configured as, and indicates the generation of ACK/NACK signalings.
Buffer storage location is configured to the data that source D2D user equipmenies storage need to be sent, convenient to retransmit, and uses
The data of reception failure are stored in purpose D2D user equipmenies, to merge decoding with retransmitting data, raising is decoded into power.
Data processing memory unit, the data of successfully decoded are stored for purpose D2D user equipmenies, because retransmitting, this
A little data order for initial data may be varied from, and wait all data transfers to finish, the unit carries out corresponding
Processing of reordering after export give upper-layer user's equipment again.
It is pointed out that the unit of D2D user equipmenies described above and assisting user equipment, only with the side of example
Formula, shows that the present invention needs the cellular construction described, equipment in practice can have more dispensing units, such as decoder list
Member etc..
The HARQ protocol design between user equipment 1 and assisting user equipment is described below in conjunction with Fig. 5 and Fig. 7, it is first
First send data to be encoded in user equipment 1, buffer storage is stored in after coding, then referred to by data transmit-receive channel
Assisting user equipment is sent this data on fixed scheduling frequency.
Then assisting user equipment receives and it is decoded in a decoder first after the data, then according to decoding
Situation indicator generator generates ACK/NACK information, and decoding data is stored in buffer storage.The ACK/ of generation
Nack message feeds back to user equipment 1 on signaling receiving and transmission channel.
Then exported if being successfully decoded data in memory to encoder, user equipment 2 be sent to after recompiling,
If decoding miss data is not exported then.Then user equipment 1 determines it is to send new data by the processing of retransmission controller
Or retransmit data.
The HARQ protocol design between assisting user equipment and user equipment 2 is described below in conjunction with Fig. 6 and Fig. 8, it is first
First it assign the data of successfully decoded in assisting user equipment as transmission data.
Then user equipment 2, user are sent the data on specified scheduling frequency by data transmit-receive channel
Equipment 2 receives and it is decoded in a decoder first after the data.
ACK/NACK information is generated then according to decoding cases indicator generator.
Then decoded data are stored in buffer storage, it is again that the data of successfully decoded are defeated in buffer storage
Go out into data processing memory.
Then output after processing is ranked up to all data that are successfully decoded in data processing memory.
It should be noted that in the above description, only in an illustrative manner, technical scheme is shown, but
It is not intended that the invention be limited to above-mentioned steps and cellular construction.In a likely scenario, can as needed to step and
Cellular construction is adjusted and accepted or rejected.Therefore, some steps and unit not implement the present invention overall invention thought institute it is required
Element.Therefore, technical characteristic essential to the invention, which is limited solely by, can realize the minimum of overall invention thought of the invention
It is required that, without being limited by above instantiation.
So far combined preferred embodiment invention has been described.It should be understood that those skilled in the art are not
In the case of departing from the spirit and scope of the present invention, various other changes can be carried out, replaces and adds.Therefore, it is of the invention
Scope be not limited to above-mentioned specific embodiment, and should be defined by the appended claims.
Claims (6)
1. a kind of dual path equipment that is used for is to the mixed automatic retransferring method in equipment D2D systems, in the dual path D2D systems
In, data alternately are sent to purpose D2D equipment by two assisting user equipments respectively from source D2D equipment, the mixing is automatic
Repeating method includes：
It is predetermined being reached from an assisting user equipment in two assisting user equipments to the re-transmission of the data of purpose D2D equipment
When number of times is still failed, the data are retransmitted and hand to another assisting user equipment to perform.
2. mixed automatic retransferring method according to claim 1, wherein,
When data re-transmission is handed into another assisting user equipment to perform, another assisting user equipment utilizes logical
Cross the data related to data re-transmission that serial interference elimination receiver is received from one assisting user equipment
The data are performed to retransmit.
3. mixed automatic retransferring method according to claim 1, wherein,
By the data retransmit hand to another assisting user equipment to perform when, another assisting user equipment according to from
The data related to data re-transmission and show that the data are set from the auxiliary user that source D2D equipment is received
The designator for the data that standby transfer comes, is retransmitted to perform the data.
4. it is a kind of in control device of the dual path equipment to the mixed automatic retransfer in equipment D2D systems, in the dual path D2D
In system, alternately data, the control are sent to purpose D2D equipment by two assisting user equipments respectively from source D2D equipment
Device includes：
It is predetermined being reached from an assisting user equipment in two assisting user equipments to the re-transmission of the data of purpose D2D equipment
When number of times is still failed, the data are retransmitted to the unit for handing to another assisting user equipment to perform.
5. control device according to claim 4, wherein,
When data re-transmission is handed into another assisting user equipment to perform, another assisting user equipment utilizes logical
Cross the data related to data re-transmission that serial interference elimination receiver is received from one assisting user equipment
The data are performed to retransmit.
6. control device according to claim 4, wherein,
By the data retransmit hand to another assisting user equipment to perform when, another assisting user equipment according to from
The data related to data re-transmission and show that the data are set from the auxiliary user that source D2D equipment is received
The designator for the data that standby transfer comes, is retransmitted to perform the data.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310136277.2A CN104113400B (en) | 2013-04-18 | 2013-04-18 | Mixed automatic retransferring method and frequency scheduling method in dual path D2D systems |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310136277.2A CN104113400B (en) | 2013-04-18 | 2013-04-18 | Mixed automatic retransferring method and frequency scheduling method in dual path D2D systems |
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| CN104113400B true CN104113400B (en) | 2017-07-28 |
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