CN104812057A - Data transmission method and device of D2D system - Google Patents

Abstract

The invention discloses a data transmission method of a D2D system. The method comprises that synchronous detection is carried out on D2D UE; according to synchronous source information detected by the D2D UE, parameters of sequence and/or scrambling code initial value employed in subsequent D2D signal transmission are obtained, and D2D signals are sent correspondingly; and the D2D UE determines parameters of D2D signal sequence and/or D2D signal scrambling code initial value according to the synchronous source information detected by the D2D UE, and further detects D2D signals sent by other D2D UE. According to the method of the invention, interference of D2D transmission among D2D UE is randomized, the range of D2D UE of mutual discovery is ensured, and the detection complexity is reduced.

Description

The method and apparatus of transfer of data in a kind of D2D system

Technical field

The application relates to mobile communication technology field, and specifically, the application relates to the method and subscriber equipment that the sequence of the D2D signal in D2D system and scramble initial value generate.

Background technology

In Long Term Evolution (LTE, Long Term Evolution) system, DMRS (DeModulation ReferenceSignal) is for the reference signal of demodulation, up at LTE, and the DMRS of each UE sends in the transmission bandwidth of this UE.The DMRS sequence of each UE generates relevant with community ID, and the DMRS signal of different districts has low cross correlation, thus reduction is from other communities, the interference of RS that sends in same asset.DMRS sequence generate also with transmission DMRS slot index and cyclic shift relating to parameters, distributed by cyclic shift Rational Parameters, make DMRS between UE orthogonal.

D2D (Device-to-Device) communication is a kind of under the control of system, allow user (UE, UserEquipment) new technique communicated directly is carried out between by reuse pattern resource, it can increase frequency spectrum efficiency of cellular communication system, reduce terminal transmit power, solve the problem of wireless communication system frequency spectrum resource scarcity to a certain extent.When carrying out D2D communication, a problem is the sequence how determining that DMRS adopts.The signal that D2D UE sends can not pass through base station (eNB) centralized control, but is initiatively initiated by UE, and such as, when the UE of transmission D2D signal is not by any MPS process, the signal that D2D UE sends cannot pass through eNB centralized control.It can not be base station centralized distribution that the DMRS sequence that this causes D2D to communicate generates parameter.The application, for the demand of D2D, proposes the generation method of DMRS.

In communication system, to random sequence scrambling being carried out to interference bit, although scrambling can not reduce the energy of interference, by be " white noise " by interference randomization to the mode of interference signal scrambling, thus suppressing to disturb.In D2D system, before directly carrying out information interaction between user, each user needs to send discovery signal (Discovery signal), so that the user of this signal can be detected around, finds the existence of this user.But, still D2D is not found that signal and signal transmission carry out scrambling and generate the method for DMRS sequence at present, to reduce the interference in D2D communication.

Summary of the invention

The application provides the method and apparatus of transfer of data in D2D system, can reduce the interference between sequence and D2D signal between D2D UE.

A method for transfer of data in D2D system, comprising:

A, D2D UE detects the signal of synchronisation source, for the transmission of arbitrary D2D signal, completes synchronizing process according in the synchronisation source detected;

B, D2D UE, according to the information of the synchronisation source detected, determines the parameter of sequence and/or the scramble initial value adopted when transmitting described D2D signal; Generate described sequence and/or described scramble initial value according to the parameter determined, and send or detect corresponding D2D signal; Described D2D signal refers to that physics D2D synchronizing channel, D2D data transfer signal and/or D2D find signal, and described D2D data transfer signal comprises D2D data controlling signal and/or D2D data traffic signals.

Preferably, the described sequence determined according to the information of described synchronisation source in step B and/or the parameter of scramble initial value are: the sequence adopted when transmitting physical D2D synchronous channel signal, D2D find signal and/or D2D data controlling signal and/or the parameter of scramble initial value;

Step B comprises further: according to the information in physics D2D synchronous channel signal, D2D discovery signal and/or D2D data controlling signal, determine the parameter of sequence and/or the scramble initial value adopted when transmitting D2D data traffic signals, and send after generating relevant parameter or detect described D2D data traffic signals.

Preferably, according to the scrambler that the information of described synchronisation source is selected or will be preset from the N number of scrambler preset, as scrambler when transmitting physical D2D synchronous channel signal, D2D discovery signal and/or D2D data controlling signal; And/or,

ID entrained by the dispatching distribution comprised according to D2D data controlling signal in step B, determines the parameter of sequence and/or the scramble initial value adopted when transmitting D2D data traffic signals.

Preferably, forbid when described D2D UE generates DMRS or scramble initial value that group is jumped and sequence is jumped; And/or,

When described D2D UE generates described scrambler, subframe or slot index are set to fixed value; And/or,

By the skew relative to benchmark subframe or time slot of the transmission subframe of described D2D signal or time slot, be defined as subframe when generating described sequence or scrambler or slot index; And/or,

If described D2D Signal transmissions adopts TTI to bundle mode, the sequence number in all subframes or time slot of a TTI binding scheduling by described D2D signal place subframe or time slot, is defined as the subframe that uses when generating described sequence or scrambler or slot index.

Preferably, described benchmark subframe or time slot are: the subframe or the time slot that send synchronizing signal, or, first subframe in dispatching distribution configuration cycle or first time slot.

Preferably, by the sequence number of the subframe of the described D2D signal of transmission in the subframe of one group of actual transmissions D2D signal of setting, subframe when generating described sequence or scrambler or slot index is defined as.

A method for transfer of data in D2D system, comprising:

E, D2D UE synchronously detects, and obtains bunch ID;

F, D2D UE, according to bunch ID obtained, determines the parameter of sequence and/or the scramble initial value adopted when transmitting D2D signal; Generate described sequence and/or scramble initial value according to the parameter determined, and send or detect corresponding D2D signal; Described D2D signal refers to that physics D2D synchronous channel signal, D2D data transfer signal and/or D2D find signal, and described D2D data transfer signal comprises D2D data controlling signal and/or D2D data traffic signals.

Preferably, when described bunch of ID is ID in dispatching distribution, if described D2D UE does not have base station to assist, then the mode of described D2D UE acquisition bunch ID is: described D2D UE selects ID in a SA inside ID collection in public dispatching distribution SA, as described bunch of ID.

Preferably, when in described step e, D2D UE receives multiple bunches of id informations, step F determines sequence and/or the scramble initial value of D2D signal on different sub frames according to different bunch ID or same cluster ID; Wherein the corresponding relation of subframe and bunch ID is determined by D2D UE or prespecified.

Preferably, the described sequence determined according to described bunch of ID in step F and/or the parameter of scramble initial value are: the discovery sequence adopted during transmission D2D data traffic signals and/or the parameter of scramble initial value;

The scrambler that transmitting physical D2D synchronous channel signal, D2D adopt when finding signal and/or D2D data controlling signal is set to constant.

Preferably, described bunch of ID is ID in SA;

Described D2D UE generates the DMRS sequence of the described D2D signal of transmission according to ID in described SA, and described DMRS sequence comprises root sequence and cyclic shift.

Preferably, utilize each value of ID in described SA to being applied to the Δ generating described sequence _ssdifferent values; And/or,

The Δ of some bit correspondence instructions for generating described sequence utilizing ID in described SA to take _ssdifferent values; And/or,

Utilize to ID in described SA according to the result after set point delivery as the Δ for generating described sequence _ss; And/or,

Utilize the different values of the corresponding described cyclic shift of each value of ID in described SA; And/or,

The different values of the described cyclic shift of some bit correspondence instructions utilizing ID in described SA to take; And/or,

To utilize in described SA ID according to the value of the result after set point delivery as described cyclic shift; And/or,

The value of described cyclic shift is set to fixed value.

Preferably, described cyclic shift is the α defined in 3GPP TS36.211, or described cyclic shift is high-rise and the cyclic shift signaling of physical layer signaling notice with

Preferably, described DMRS sequence comprises orthogonal mask OCC further;

Random selecting or determine the sequence number of described OCC according to the ID in described SA.

Preferably, forbid when described D2D UE generates DMRS or scramble initial value that group is jumped and sequence is jumped; And/or,

When described D2D UE generates described scrambler, subframe or slot index are set to fixed value; And/or,

By the skew relative to benchmark subframe or time slot of the transmission subframe of described D2D signal or time slot, be defined as subframe when generating described sequence or scrambler or slot index; And/or,

If described D2D Signal transmissions adopts TTI to bundle mode, the sequence number in all subframes or time slot of a TTI binding scheduling by described D2D signal place subframe or time slot, is defined as the subframe that uses when generating described sequence or scrambler or slot index.

Preferably, described benchmark subframe or time slot are: the subframe or the time slot that send synchronizing signal, or, first subframe in dispatching distribution configuration cycle or first time slot.

Preferably, by the sequence number of the subframe of the described D2D signal of transmission in the subframe of one group of actual transmissions D2D signal of setting, subframe when generating described sequence or scrambler or slot index is defined as.

A method for transfer of data in D2D system, comprising:

D2D UE Stochastic choice or according to parameter or base station signal deployment, determines the cyclic shift parameter alpha and/or the sequence group number u relevant parameter that generate DMRS; And according to the α determined and/or sequence group number u relevant parameter, the DMRS adopted when generating transmission D2D signal.

Preferably, forbid when described D2D UE generates DMRS that group is jumped and sequence is jumped.

A method for transfer of data in D2D system, comprising:

D2D UE detects synchronisation source, receives the broadcast message of eNB or D2D UE;

Described D2D UE determines the parameter of D2D burst, DMRS sequence and D2D signal scrambling code initial value according to the broadcast message received, and the sequence adopted when generating transmission D2D signal and scramble initial value, send or detect corresponding D2D signal.

An equipment for transfer of data in D2D system, comprising: lock unit, sequence and scramble initial value generation unit, D2D signal processing unit;

Described lock unit, for detecting the signal of synchronisation source, for the transmission of arbitrary D2D signal, completes synchronizing process according in the synchronisation source detected;

Described sequence and scramble initial value generation unit, for the synchronisation source information detected according to described lock unit, determine the parameter of sequence and/or the scramble initial value adopted when transmitting D2D signal; Described sequence and/or described scramble initial value is generated according to the parameter determined;

Described D2D signal processing unit, for according to the described sequence generated and/or described scramble initial value, sends or detects corresponding D2D signal; Wherein, described D2D signal refers to D2D data transfer signal, and/or D2D finds signal.

An equipment for transfer of data in D2D system, comprising: lock unit, sequence and scramble initial value generation unit, D2D signal processing unit;

Described lock unit, for synchronously detecting, and obtains bunch ID;

Described sequence and scramble initial value generation unit, for according to bunch ID obtained, determine the parameter of sequence and/or the scramble initial value adopted when transmitting D2D signal, and generate described sequence and/or scramble initial value according to the parameter determined;

Described D2D signal processing unit, for according to the described sequence generated and/or described scramble initial value, sends or detects corresponding D2D signal; Wherein, described D2D signal refers to D2D data transfer signal, and/or D2D finds signal.

An equipment for transfer of data in D2D system, comprising: lock unit, sequence and scramble initial value generation unit, D2D signal processing unit;

Described lock unit, for detecting synchronisation source, and receives the broadcast message of eNB or D2D UE;

Described sequence and scramble initial value generation unit, for determining the parameter of D2D burst, DMRS sequence and D2D signal scrambling code initial value according to described broadcast message, the sequence adopted when generating transmission D2D signal and scramble initial value;

Described D2D signal processing unit, for according to the described sequence determined and scramble initial value, sends or detects corresponding D2D signal.

As seen from the above technical solution, in the D2D system data transmission method that the application provides and equipment, give the method for sequence and the generation of D2D signal scrambling code initial value, can the interference of D2D transmission between randomization D2D UE, while ensureing the D2D UE scope found mutually, reduce detection complexity.

Accompanying drawing explanation

Fig. 1 is the method overview flow chart of transfer of data in the first D2D system of the application;

Fig. 2 is the method overview flow chart of transfer of data in the application's the second D2D system;

Fig. 3 is the method flow diagram of the embodiment of the present application one;

Fig. 4 is the method flow diagram of the embodiment of the present application two;

Fig. 5 is the method flow diagram of the embodiment of the present application three;

Fig. 6 is the method flow diagram of transfer of data in the third D2D system.

Embodiment

In order to make the object of the application, technological means and advantage clearly understand, below in conjunction with accompanying drawing, the application is described in further details.

In LTE D2D system, first D2D UE can set up synchronous based on synchronisation source, the targeting sequencing (preamble) that the synchronizing signal that the physics D2D synchronizing channel (Physical D2D Synchrization Channel) that synchronisation source signal can be D2D synchronizing signal (D2D Synchrization Signal), D2D UE sends, eNB send, D2D UE send or demodulated reference signal (DMRS:Demodulation reference signal); Then, based on this synchronized relation, D2D UE can transmit follow-up D2D signal.Such as, the signal etc. that follow-up D2D signal can be physics D2D synchronizing channel, D2D finds signal or D2D transfer of data.Wherein, physics D2D synchronizing channel can be made up of DMRS and sync channel data part, or D2D synchronizing signal also can be utilized to carry out demodulation, and such physics D2D synchronizing channel only has sync channel data part; D2D finds that signal can be made up of sequence (Sequence) and message (Message).Wherein, sequence (follow-up being called finds sequence) can refer to the DMRS for demodulation message part, also can be the sequence independent of above-mentioned DMRS, as targeting sequencing; The signal of D2D transfer of data can comprise two kinds, one is D2D data controlling signal, also dispatching distribution (SA:Scheduling Assignment) is, comprise signal and/or the DMRS of D2D data control channel, another kind is D2D data traffic signals, comprises the signal of DMRS and D2D data communication channel.D2D transfer of data can be broadcast (broadcast) or clean culture (unicast).Here, suppose that D2D UE establishes synchronously based on synchronisation source, the application proposes the method processing follow-up D2D Signal transmissions.

As mentioned above, in D2D transmission, after D2D UE receives synchronisation source signal thus sets up synchronously, D2D UE can complete discovery procedure further or carry out D2D transfer of data.The application proposes the production method of the scrambler/sequence of described D2DUE when transmitting D2D signal.Here, signal is found to D2D, needing discovery sequence (as targeting sequencing), the DMRS sequence (when finding that sequence is the sequence independent of DMRS) finding signal message part and the scrambler of determining that D2D UE will use, wherein finding that signal scrambling code can be used for the scrambling finding sequence and find signal message partial information bit.To D2D transfer of data, also need to determine the DMRS sequence of data demodulates and the scrambler for data scrambling.

Adopt the method for the application determination scrambler/sequence, on the one hand can the interference of D2D transmission between the different D2D UE of randomization, and reduce the detection complexity between the D2D UE carrying out D2D communication.Particularly, the method for transfer of data in three kinds of D2D systems is provided in the application.

Fig. 1 is the method for transfer of data in the first D2D system in the application, and the method comprises the following steps:

Step 101:D2D UE detects the signal of synchronisation source, and completes synchronizing process based on one of them synchronisation source.

D2D UE likely detects the signal of multiple synchronisation source, can only determine synchronized relation when a D2D transmission according to a synchronisation source.Such as, D2D transmission here can refer to the D2D Signal transmissions in a subframe.To not in the same time D2D transmission, its synchronisation source adopted can be identical or different.Synchronisation source signal can be the signal structure adopting existing LTE system, the PSS/SSS namely comprised, or also can be the signal structure adopting other, and the application does not limit.

Step 102:D2D UE is according to the information of the synchronisation source detected, the sequence adopted when determining its subsequent transmission D2D signal and/or the parameter of scramble initial value, then send D2D signal accordingly.

Wherein, described D2D signal can refer to that physics D2D synchronizing channel, D2D data transfer signal and/or D2D find signal.Find signal for D2D, the sequence adopted when transmitting this signal and scramble initial value comprise: find sequence (as targeting sequencing), find the parameter of the initial value of the pseudo random sequence of the DMRS sequence of signal message part and generation scrambler; For D2D data transfer signal, the sequence adopted when transmitting this signal and scramble initial value comprise: the parameter of the initial value of the pseudo random sequence of DMRS sequence and generation data scrambler.

When the transmission of D2D signal each time, D2D UE determines the sequence of D2D signal according to the information of synchronisation source and/or produces the parameter of initial value of pseudo random sequence of scrambler.Wherein, the information of synchronisation source can be the information entrained by a synchronisation source signal detected in step 101, particularly, may be the information entrained by a synchronisation source signal of Stochastic choice from the synchronisation source received, or may be the information that the synchronisation source source signal for completing synchronizing process carries, or also may be other information entrained by synchronisation source signal detected.Particularly, the information that synchronisation source carries can comprise synchronisation source ID, original synchronisation source ID, or which from original synchronisation source jumps one or more in the information such as synchronisation source.

D2D UE likely detects that the quality of reception is greater than the signal of multiple synchronisation sources of a thresholding, such as UE detects that the quality of reception is greater than the synchronizing signal of the multiple community of thresholding, in order to ensure can to find mutually based on different synchronisation source UE, and then D2D communication, UE can generate scrambler at different transmission times according to each synchronisation source ID detected respectively, DMRS sequence and/or discovery sequence, then according to generate synchronous sequence corresponding to scrambler or sequence synchronization source and send D2D and find signal, the signal of D2D data control channel, the signal of D2D data communication channel and/or D2D transfer of data DMRS sequence.When the information determination relevant parameter according to synchronisation source, following several mode can be adopted:

Such as, to the D2D UE be within cell coverage area, its synchronisation source ID can be exactly community ID.Accordingly, be the equal of determine the sequence of D2D signal and the parameter of scramble initial value based on information such as community ID and subframe numbers in this step.

Again such as, to the D2D UE be within cell coverage area, the information transmission D2D signal of the synchronisation source of this community eNB can also be different from according to other detecting.Such as, in order to the D2D UE that can be in outside cell coverage area with transmits D2D signal, the above-mentioned D2D UE be within cell coverage area can detect the synchronisation source that the D2D UE outside cell coverage area may rely on, and according to the respective synchronization source information transmission D2D signal detected, carry out D2D with the D2D UE depending on this synchronisation source and communicate.At this moment, the parameter that the information such as the synchronisation source ID of the D2D UE outside cell coverage area may be used for determining the sequence of D2D signal and the initial value of scrambler is in.

Again such as, to the D2D UE be in outside cell coverage area, it may be that the N that have received other D2D UE forwarding jumps synchronisation source, and establishes synchronous; Wherein, the original synchronisation source of N jumping synchronisation source can be the synchronizing signal of the D2D UE transmission outside a cell coverage area, or the synchronizing signal of community.This D2D UE can jump synchronisation source according to this N and send D2D signal, namely determines the parameter of the sequence of D2D signal and the initial value of scrambler according to the information of described N jumping synchronisation source; Or this D2D UE can parse original synchronisation source ID from synchronizing signal, determine the sequence of D2D signal and the parameter of scramble initial value with original synchronisation source ID.

In addition, when generating D2D scrambler, the community ID of the scrambling parameter of PUSCH in LTE existing version can be replaced with synchronisation source ID, or slot index can be set to fixed value, or, when generating the scrambler of D2D data communication channel signal, the RNTI that PUSCH transmission is correlated with can be replaced with the content from finding to obtain signal and/or D2D data control channel, such as replace with and find targeting sequencing sequence number in signal, or ID etc. in dispatching distribution, namely according to the information extracted from the discovery signal received and/or D2D data control channel signal, generate the scrambler of D2D data traffic signals.

In addition, physics D2D synchronizing channel, D2D find that signal, D2D data controlling signal are different with the D2D UE scope that D2D data traffic signals acts on, physics D2D synchronizing channel, D2D find signal and D2D data controlling signal (especially D2D broadcast data control signal), need the D2D UE in certain limit can be detected, D2D data traffic signals only makes the UE carrying out D2D communication to receive; Therefore, physics D2D synchronizing channel, D2D find that signal or D2D data controlling signal are compared with D2D data traffic signals, can adopt different parameters formation sequence or scramble initial value.Such as, D2D UE can jump according to original synchronisation source ID or N the parameter that the information such as synchronisation source ID determine sequence and/or the scramble initial value adopted in physics D2D synchronizing channel, D2D discovery signal and/or D2D data controlling signal according to the mode in above-mentioned steps 102; Then, according to physics D2D synchronous channel signal, D2D, D2D UE finds that the content in signal or D2D data controlling signal determines the DMRS sequence of D2D data traffic signals or the parameter of data scramble initial value.And for example, physics D2D synchronizing channel, D2D are found that signal or D2D data controlling signal adopt simple scrambler, simple scrambler can be fixed value, or from several fixed value, select one according to synchronisation source ID, and D2D data traffic signals is according to the information determination scrambler in D2D discovery signal or in D2D data controlling signal and sequence, as determined according to the ID (ID namely carried in dispatching distribution SA) in dispatching distribution.

The information of one or more synchronisation source that step 103:D2D UE detects according to it, the sequence of D2D signal and/or the parameter of scramble initial value in determining step 102, detect the D2D signal depending on identical synchronisation source D2D UE and send.

In order to reduce UE detection complexity, D2D Signal reception UE can DMRS in blind Detecting D2D data controlling signal, then the partial information of the synchronisation source ID of D2D data controlling signal is inferred according to DMRS sequence, if according to this partial information D2D signal, receive UE can be derived from this DMRS come from different synchronisation source under D2D UE, and UE does not have D2D to communicate with UE under different synchronisation source, so UE can not detect D2D data control channel corresponding to this DMRS, like this, the number that UE detects D2D data control channel can be reduced.Have two D2D UE in such as community 1, UE A and UE B, wherein UE A and UE C in community 2 communicate carrying out D2D.The synchronizing signal being all for community 1 UE A and community 2 is all its synchronisation source, if UE B receives the DMRS that adjacent cell UE C sends, this DMRS generates according to community 2 synchronisation source information, and UE B communicates with not carrying out D2D with the UE under the synchronisation source of community 2, then UE B can not detect D2D data controlling signal corresponding to this DMRS.

Here, to a D2D UE, the parameter of the initial value of the pseudo random sequence of the sequence of D2D signal and/or the scrambler of generation D2D signal only can be determined according to a synchronisation source information, thus the D2D signal that the information only detecting this synchronisation source is determined.This synchronisation source can be exactly that this UE is actually used in and sets up synchronous synchronisation source.Adopt such method, the blind Detecting number of times of UE can be reduced, because the sequence/scrambler of the D2D signal that it will detect can by its synchronisation source information acquisition, but (synchronizing signal that other synchronisation sources described here and D2D UE set up synchronous relied on synchronisation source transmission comes from same original synchronisation source also to cause a D2D UE can not accept to be synchronized with other synchronisation sources, or set up with D2D UE the synchronizing signal that synchronous relied on synchronisation source sends and come from different original synchronisation source, lower with) the D2D signal of D2D UE.Or, in order to receive more potential D2D signal as much as possible, UE can be the sequence of the D2D signal determined according to the information of multiple synchronisation source and/or produce the parameter of initial value of pseudo random sequence of scrambler of D2D signal, thus D2DUE can detect the D2D signal of the information transmission of multiple synchronisation source.Adopt this method, D2D UE likely sets up D2D with more D2D UE and communicates.Such as, the D2D signal that D2D UE can be corresponding to this synchronisation source according to the information direct-detection of the multiple synchronisation sources detected; Or, also can determine the information of other synchronisation sources relevant according to the information of the synchronisation source detected, and detect corresponding D2D signal; Or, in order to make the D2D UE under different synchronisation source can use identical D2D signal scrambling code and D2D DMRS signal parameter, constant scrambling can be adopted to some D2D signal.

When D2D signal adopts constant scrambling, in order to reduce the interference of D2D signal to this community and adjacent cell PUSCH channel, and the mutual interference reduced when D2D signal resource collides, D2D signal data control channel can be made to adopt lower-wattage to send, such as, the power lower than setting thresholding is adopted to send, or far below the transmitted power of PUSCH; Meanwhile, in order to ensure that the quality of reception can repeat to send to D2D signal, different UEs can share identical running time-frequency resource based on code division multiple access.Such as, in D2D data control channel, data acquisition spreading factor is send after the spreading codes of N.

So far, in the first D2D system, the overall procedure of data transmission method terminates.Introduce the method for transfer of data in the second D2D system below.

In D2D system, several D2D UE are formed one bunch (Cluster), in some cycles, can find mutually, maybe can find same UE between the D2D UE in bunch.When such as D2D UE broadcasts (multicast/clean culture) signal, the D2D UE sending and receive broadcast (multicast/clean culture) signal forms one bunch.Such as, for the D2D communication in broadcast group, send D2D UE and all reception D2D UE and form one bunch; D2D for clean culture communicates, and a pair D2D UE carrying out D2D communication forms one bunch, and the D2D for multicast communicates, and the one group of D2D UE carrying out D2D communication forms one bunch.

Each bunch can have a D2D UE to take on a bunch head (Cluster Head), and selection the application of bunch head is not discussed.Here, suppose that each bunch has a bunch of ID, bunch ID can be carried by synchronizing signal, such as by bunch in certain D2D UE send synchronizing signal, or by bunch head bunch in the information of broadcast transmission bunch ID, or by base station assigns, the acquisition pattern the application for bunch ID does not limit.Bunch ID can be D2D-RNTI (Radio Network Temporary Identifier), can be the ID in D2D UE dispatching distribution, or by D2D signal resource pond ID secondary indication.

About the ID in the dispatching distribution as bunch ID, when sending the UE of D2D signal when not having under the aided case of base station, D2D UE can select the middle ID of a dispatching distribution (SA) as a bunch ID from several optional dispatching distributions inside ID, in optional dispatching distribution, ID number is less than ID number in total dispatching distribution, further, in optional SA, gather can without common factor for ID set and ID in the SA of base station assigns, and in this part optional SA, ID gathers and is called as ID in public SA (in common SA ID).If the SA containing ID in public SA that UE receives, UE can detect corresponding D2D data communication channel, or whether detects D2D data communication channel corresponding to ID in public SA according to high-rise configuration determination.Such as outside MPS process, D2D UE broadcasts distress signal can adopt ID broadcast in public SA.The D2D UE of MPS process should be avoided to use and to carry out advertising for ID in the SA of public safety situation.

First D2D UE obtains synchronously, and can select to determine according to a bunch head broadcast, base station assigns, configured in advance or UE by obtaining bunch ID, bunch ID; Then, follow-up D2D signal can be transmitted based on this bunch of ID, D2D UE.That is, when D2D UE obtains after bunch ID, a bunch ID is utilized to determine to find in D2D UE D2D signal burst and/or DMRS sequence and/or scramble initial value.Here D2D signal refers to that D2D data transfer signal and/or D2D find signal.Adopt the method for the application, the interference of the D2D transmission between different bunches of randomization between D2D UE, it only needs carry out discoverys input according to bunch ID, both can reduce and find signal blind check number of times, and ensure to need the D2D UE of discovery to be mutually likely found.As shown in Figure 2, the method comprises the following steps:

Step 201:D2D UE synchronously detects, and obtains bunch ID and relevant parameter.

After D2D UE detects the signal of synchronisation source, obtain bunch ID.Bunch ID is determined according to parameters such as corresponding UE ID by a bunch head UE, or auxiliaryly to be determined by base station, configured in advance or UE select etc. determines, do not discuss in detail here.

Step 202:D2D UE is according to bunch id information obtained, the sequence adopted when obtaining its subsequent transmission D2D signal, and/or the parameter of the initial value of the pseudo random sequence of generation scrambler, then corresponding D2D signal is sent, described D2D signal is physics D2D synchronous channel signal, D2D finds signal, or D2D data controlling signal, or D2D data traffic signals.

D2D UE belongs to multiple bunches, multiple bunches of id informations can be detected, and such as, D2D UE belongs in multiple cast communication.In general, can only communicate with the D2D UE of bunch when a D2D transmission.Such as, D2D transmission here can refer to the D2D Signal transmissions in a subframe.Like this, the D2D transmission of different subframe is according to the generation sequence of different bunch ID and/or scramble initial value parameter.Such as, suppose that D2D UE transmits D2D to find signal after acquisition bunch ID, then D2D UE is according to a bunch ID being detected, can be produce according to different bunch ID on different sub frames to find sequence, find the DMRS sequence of message, and find the scramble initial value of message, so that can be found by the D2D UE of multiple bunches, wherein the corresponding relation of subframe and bunch ID can be determined by D2D UE or preset.

In addition, due to D2D find signal and D2D broadcast data control channel different with the D2D UE scope that D2D data transfer signal and D2D broadcast data signal of communication act on; Therefore, D2D finds that signal and D2D broadcast data control channel and D2D signal of communication and D2D broadcast data signal of communication can adopt different parameters formation sequence or scramble initial value.Such as, D2D UE only can determine the parameter of sequence and/or the scramble initial value adopted in D2D data traffic signals according to information such as bunch ID according to the mode in above-mentioned steps 202; D2D UE D2D finds that the scrambler of signal and D2D data controlling signal and sequence are determined, by other means as scrambler is decided to be constant.

When D2D UE is in cell coverage area, carry out the D2D UE of D2D communication, before transmission data controlling signal, id information in the known dispatching distribution of possibility, so UE can according to the sequence in ID generation data controlling signal in dispatching distribution and/or scrambler, or the position of dispatching distribution resource or sequence number, namely in dispatching distribution, id information is the parameter generating sequence in unicast data control signal and scrambler.Like this, the problem of control signal resource contention can be alleviated, than the channel estimation errors that DMRS resource contention causes.

In D2D signal, DMRS can determine according to ID in SA.The application DMRS sequence comprises root sequence and cyclic shift, or, orthogonal mask can also be comprised.

Parameter Δ is needed when generating root sequence _ss, how to utilize Δ _ssgenerate DMRS, see the 5.5.2 of 3GPP TS36.211v10.2.0.The corresponding Δ of each sequence number of ID in SA can be made _ssvalue, in such as SA, ID is made up of 8 bits, has 64 sequence numbers, can make 64 sequence numbers corresponding Δs respectively _ss30 sequence numbers in one; Or some bit instruction Δs of ID in SA _ssvalue, 5 bits instruction Δs in such as SA in ID _ss30 values in one; Or be Δ to ID in SA according to the value obtained after certain value delivery _ss, such as according to 30 deliverys, Δ is obtained to ID in SA _ss.

During generation cycle shift parameters, can make the value of the corresponding cyclic shift of each sequence number of ID in SA, in such as SA, ID is made up of 8 bits, corresponding 64 sequence numbers, can make 12 (or 8) sequence numbers of 64 corresponding cyclic shifts of sequence numbers difference; Or the value of some bit instruction cyclic shifts of ID in SA, one in 3 bit instruction cyclic shifts, eight values in such as SA in ID; Or according to the value after certain value delivery, cyclic shift is obtained to ID in SA, such as according to 12 deliverys, cyclic shift is obtained to ID in SA; Or, make cyclic shift be fixed value, as 0.Here cyclic shift may correspond to the cyclic shift α defined in 3GPP TS36.211, or cyclic shift signaling that is high-rise, physical layer signaling notice and

Formed by three components additions according to LTE version 10, cyclic shift α, three components are high-rise notice and physical layer notice and n _pRS(n _s).In this application, cyclic shift α still can be made to be added by three components and to form, can n be made _pRS(n _s) be fixed value (as 0), or generate n according to the regulation in 3GPP TS36.211v10.2.0 _pRS(n _s), but required community ID is the fixed value between 504 ~ 511, required slot index n _sbe set to fixed value, or describe according in the application, determine slot index relative to offseting of a reference slot.

When the DMRS that D2D finds in signal, D2D data controlling signal or D2D data traffic signals adopts orthogonal mask (OCC:Orthogonal Cover Code), the orthogonal mask sequence number of UE need be indicated, the OCC sequence number of UE can random selecting, or determine according to the ID in SA, a bit instruction OCC of ID in such as SA, the value after and for example all bits of ID carry out certain computing (as mould 2 adds) in SA indicates OCC.

The information of one or more bunch of ID that step 203:D2D UE detects according to it, the parameter of the pseudo random sequence initial value of the sequence of the D2D signal that determining step 202 is determined and/or the scrambler of generation D2D signal, thus detect the D2D signal that in respective cluster, D2D UE sends.

In order to reduce UE detection complexity, D2D Signal reception UE can DMRS in blind Detecting D2D data controlling signal, then be whether the reception UE of D2D data controlling signal according to the parametric inference oneself of blind Detecting DMRS, thus determine whether to carry out decoding to D2D data control channel.Such as, ID in all dispatching distributions can be divided into several groups, can infer in SA, which group ID belongs to according to DMRS sequence, determine whether to carry out decoding to D2D data control channel according to id information in this dispatching distribution.Such as, when ID in the SA detected belongs to different groups from ID in the SA of this D2D UE, decoding can not be carried out to the signal of D2D data control channel.Like this, the number that UE detects D2D data control channel can be reduced.

So far, in the second D2D system, the overall procedure of data transmission method terminates.

In D2D system, because D2D UE can transmit the resource of D2D signal from main separation, and the D2D signal resource that the D2D UE of this community may use with adjacent cell D2D UE is distributed by different base station, therefore, the DMRS signal needed for D2D transmission that different D2D UE sends may collide, when the signal of two D2DUE collides, the accuracy of detection of D2D signal can be reduced.In order to reduce the probability of collision, D2D UE Stochastic choice can be made, or make D2D UE generate according to parameter, or base station generates cyclic shift α needed for DMRS and/or sequence group number u relevant parameter and D2D by high-level signaling or physical layer signaling configuration and finds signal, how to utilize α and u to generate DMRS, see the 5.5.2 of 3GPP TS36.211v10.2.0.

Such as when UE adopts the discovery signal of type 2 (type2), or adopt pattern 1 (mode1) transmit communications signals, find that needed for signal and/or signal of communication, DMRS cyclic shift and/or sequence group number relevant parameter are specified by base station; Or and for example, when UE adopts the discovery signal of Class1 (type1), or during employing pattern 2 (mode2) transmit communications signals, find that needed for signal and/or signal of communication, DMRS cyclic shift and/or sequence group number relevant parameter are independently produced by D2D UE, can produce at random, or the UE sending D2D signal determines according to its known parameters, this known parameters can be D2D RNTI, ID in SA, sends or receives the ID etc. of UE.

According to existing LTE version, when generating DMRS and scrambler, UE needs to know slot index, in D2D system, when UE is in situations such as MPS process are outer, the method of the determination slot index of existing LTE system is inapplicable, and a kind of processing method makes the generation of the DMRS in D2D system forbid group jumping (group hopping) and sequence jumping (sequence hopping), and now UE generates DMRS and can not rely on slot index.The D2D DMRS of the outer UE of such as MPS process forbids that group is jumped and sequence is jumped.Or, to D2D UE in situations such as MPS process are outer, be that can to arrange subframe (or time slot) sequence number be a fixed value at generation scrambler, such as 0.Or, D2D signal subframe (or time slot) will be transmitted and offset relative to a benchmark subframe (or time slot) sequence number being defined as this subframe (or time slot), then utilize this serial number gencration sequence and scrambler.Such as, this benchmark subframe (or time slot) is the subframe (or time slot) sending synchronizing signal, or this benchmark subframe (or time slot) is the subframe of first in dispatching distribution configuration cycle (or time slot).Or, if D2D Signal transmissions adopts the mode of TTI binding (TTI bundling), in TTI binding, a dispatching distribution can dispatch multiple D2D subframe, so, the sequence number of D2D subframe (or time slot) in some subframes (or time slot) of a TTI binding scheduling is just for generating subframe (or time slot) sequence number of scrambler and DMRS sequence.The above-mentioned method determining the sequence number of subframe (or time slot) according to benchmark subframe (or time slot) can only for the situation of UE outside MPS process, or, also under can being applied to all D2D scenes, here all D2D scenes not only refer to the MPS process situation of D2D UE, also the situation that will use subframe sequence number when any D2D signal generates is comprised, when such as generating PD2DSCH, subframe sequence number can adopt the method described in the application.

In D2D, can be that a part of subframe is used for D2D transmission in one-period.Such as, for the D2D in MPS process, if there is the subframe of a same sequence number to be D2D subframe in each radio frames, this sequence number refers to the sequence number of subframe in radio frames, and it is relevant with the sequence number of subframe in radio frames with DMRS sequence to generate scrambler, so, when generating each subframe D2D DMRS sequence and scrambler, the subframe sequence number parameter used is all identical, and this causes the D2D DMRS sequence of each subframe and scrambler to be identical, loses the function that interference is average.In order to distinguish scrambler in each subframe and DMRS sequence, D2D scrambling and subframe (or time slot) sequence number generated needed for DMRS can be made to be the sequence number of subframe in all subframes being actually used in D2D transmission of an actual transmissions D2D signal.Such as, between the subframe of two synchronous signal transmissions, have N number of sub-frame transmission D2D signal, the subframe sequence number generating scrambler and DMRS sequence is just the sequence number of subframe in this N number of D2D subframe.

In addition, because UE can according to can obtain the cyclic shift α of DMRS, orthogonal mask (OCC:othorgonal cover code) or other cyclic shift parameter to D2D signal DMRS blind Detecting, send D2D UE and message channel is found to the physics D2D synchronizing channel at this DMRS place, D2D, D2D data control channel, or the enough above-mentioned parameters obtained by blind Detecting of D2D data communication channel utilizable energy are as scrambling parameter, and the signal of above-mentioned respective channel is carried out to scrambling and sends.α, OCC that blind Detecting just can be determined by reception D2D UE or other cyclic shift parameter, as the scrambling parameter of above-mentioned channel, detect the signal of respective channel.The implementation method of above-mentioned two kinds of methods being described below by two embodiments, illustrating how when determining the parameter of the sequence of D2D and scramble initial value, the information such as the information in application of synchronized source and/or bunch ID.The present invention does not limit the implementation method of employing below in two embodiments.

Embodiment one:

The present embodiment discusses the specific implementation of data transmission method in the second D2D system.

Step 301:D2D UE synchronously detects, and obtains the information such as bunch ID.

Wherein, bunch id information can be obtained by bunch inter-sync signal or bunch head broadcast.

Step 302: determine to transmit the sequence of D2D signal and the parameter of scramble initial value according to bunch ID, and formation sequence, DMRS sequence and scramble initial value c _init, and send corresponding signal.

Wherein, according to a bunch mode for ID generation scrambler sequence initial value can be:

Or,

$c_{\mathrm{init}}=c\·2^9+N_{\mathrm{ID}}^{{\mathrm{Sync}}_{\mathrm{source}}}$

Wherein for D2D UE detects the i-th bunch of ID, n _sfor slot index, N is number of bits.When D2D UE detects multiple bunches of id informations, send each the subframe finding signal or D2D transfer of data, UE selects one bunch to send corresponding signal, or according to preset bunch and the mapping relations of subframe determine that bunch sends a corresponding signal.

When generating DMRS, the sequence set shift offsets amount Δ that bunch ID derives needed for generation DMRS sequence can be utilized _ss,

${\mathrm{\Δ}}_{\mathrm{ss}}=N_{\mathrm{ID}}^{\mathrm{cluster}}\mathrm{mod}{2}^5.$

When generating DMRS, physical layer cyclic shift can be determined according to a bunch ID, if f (m) is physical layer cyclic shift, wherein and determine f (m) according to the mapping relations of m and f (m) preset, table 2 gives the mapping relations between a kind of m and f (m) value.

Table 2

M	0	1	2	3	4	5	6	7
									f(m)	0	6	2	4	2	8	10	9

When D2D UE is positioned at cell coverage area, relevant parameter can be determined according to a community ID and bunch ID further, such as scramble initial value can be set to

Wherein for D2D UE detects the i-th bunch of ID, n _sfor slot index, for community ID, what send in subframe according to bunch ID, D2D UE is for the discovery signal of D2D UE or data transfer signal in bunch.When D2D UE detects multiple bunches of id informations, send each the subframe finding signal or D2D transfer of data, UE selects one bunch to send corresponding signal, or according to preset bunch and the mapping relations of subframe determine that bunch sends a corresponding signal.

One or more bunch of ID that step 303:D2D UE detects according to it etc. information, the parameter of the pseudo random sequence initial value of the sequence of the D2D signal that determining step 302 is determined and/or the scrambler of generation D2D signal, thus detect the D2D signal of other D2D UE transmission.

Embodiment two:

The present embodiment discusses the specific implementation of data transmission method in the first D2D system.Fig. 4 is the method flow schematic diagram in the present embodiment, and the method comprises the steps:

After step 401:UE and synchronisation source are synchronous, obtain synchronisation source ID etc. information.

Wherein, when UE carries out synchronous with synchronisation source, can be and base station synchronization, also can be receive other UE forward synchronizing sequence and carry out synchronous.

The information such as the synchronisation source ID that step 402:D2D UE determines according to step 401, generate D2D sequence, DMRS sequence and D2D signal scrambling code initial value relevant parameter, and send corresponding signal.

Such as, the cyclic shift that the cyclic shift arranged by high level, physical layer are arranged and sequence set shift offsets amount Δ _ssall be set to zero, and according to a time slot internal symbol number generate DMRS;

The initial value of such as D2D signal scrambling code is again:

for synchronisation source ID.

The information of the synchronisation source that step 403:D2D UE detects according to it the parameter of the pseudo random sequence initial value of the sequence of the D2D signal that determining step 402 is determined and/or the scrambler of generation D2D signal, thus detect the D2D signal of other D2D UE transmission.

Embodiment three:

The present embodiment discusses the specific implementation of data transmission method in the second D2D system.Wherein, using ID in SA as a bunch ID.Fig. 5 is corresponding method flow schematic diagram, as shown in Figure 5, specifically comprises:

Step 501:D2D UE synchronously detects, and receives SA, obtains the information such as SA ID.

Step 502: the parameter generating DMRS sequence in D2D data transfer signal according to SA ID, and formation sequence.

Step 503:D2D UE indicates according to SA, and specific position receives DMRS, and the DMRS according to the parameter determined in step 502 and reception carries out the operations such as channel estimating.

Introduce the method for transfer of data in the third D2D system in the application below.

This method proposes the method for the parameter generating D2D burst, DMRS sequence and D2D signal scrambling code initial value for the RRC Idle UE in cell coverage area.RRC Connect UE can adopt the method identical with RRC IdleUE to generate the parameter of D2D burst, DMRS sequence and D2D signal scrambling code initial value.Fig. 6 is the schematic flow sheet of the method.As shown in Figure 6, specifically comprise:

The D2D UE of step 601:RRC Idle state detects synchronisation source, receives the information of the parameter of the generation D2D burst of eNB or D2D UE broadcast, DMRS sequence and D2D signal scrambling code initial value.

Wherein, directly D2D UE formation sequence can be carried, the relevant parameter of DMRS sequence and D2D signal scrambling code initial value in the information of eNB broadcast.Such as, these parameters can be high-rise cyclic shift, sequence set shift offsets amount Δ _ssand a time slot internal symbol number the D2D UE being in RRC Idle state can receive the broadcast message of these eNB, thus determines corresponding parameter.

Except reception eNB broadcast message, D2D UE can also receive the signal that other D2D UE send, thus determines that bunch ID and other are different from the information of the synchronisation source of this community.Wherein, the acquisition of the information of bunch ID and synchronisation source can adopt the corresponding manner in two kinds of D2D signal transmissions above and detection method.Here just repeat no more.

When step 602:D2D UE is in RRC idle state, according to the parameter determined in step 601, formation sequence, DMRS sequence and D2D signal scrambling code initial value relevant parameter, and send corresponding D2D signal.

Wherein, the physical layer cyclic shift generated needed for DMRS can be set to a constant, the UE C-RNTI needed for the initial value of generation D2D signal scrambling code is also set to a constant, such as, be 0.

Meanwhile, as described in step 601, D2D UE can also determine the information of bunch ID and synchronisation source.If D2D UE can determine a bunch id information, then in this step, can also according to the second method of the application, according to a bunch id information determination formation sequence, DMRS sequence and D2D signal scrambling code initial value relevant parameter.

If D2D UE can determine the information of synchronisation source, then in this step, can also according to the first method of the application, according to synchronisation source information determination formation sequence, DMRS sequence and D2D signal scrambling code initial value relevant parameter.

Step 603:D2D UE according to parameters such as the broadcast messages received, the sequence of the D2D signal that determining step 602 is determined and/or produce the parameter of pseudo random sequence initial value of scrambler of D2D signal, thus the D2D signal detecting that other D2D UE send.

So far, in the third D2D system, the method flow of transfer of data terminates.

Present invention also provides the equipment of transfer of data in three kinds of D2D systems, may be used for the method implementing above-mentioned three kinds of transfer of data.

Particularly, in the first D2D system, the equipment of transfer of data comprises lock unit, sequence and scramble initial value generation unit, D2D signal processing unit.

Wherein, lock unit, for detecting the signal of synchronisation source, for the transmission of arbitrary D2D signal, completes synchronizing process according in the synchronisation source detected.Sequence and scramble initial value generation unit, for the information of synchronisation source detected according to described lock unit, determine the parameter of sequence and/or the scramble initial value adopted when transmitting D2D signal; Described sequence and/or described scramble initial value is generated according to the parameter determined.D2D signal processing unit, for according to the sequence generated and/or described scramble initial value, sends or detects corresponding D2D signal; Wherein, D2D signal refers to D2D data transfer signal, and/or D2D finds signal.

In the second D2D system, the equipment of transfer of data comprises: lock unit, sequence and scramble initial value generation unit, D2D signal processing unit.

Wherein, lock unit, for synchronously detecting, and obtains bunch ID.Sequence and scramble initial value generation unit, for according to bunch ID obtained, determine the parameter of sequence and/or the scramble initial value adopted when transmitting D2D signal, and generate described sequence and/or scramble initial value according to the parameter determined.D2D signal processing unit, for according to the described sequence generated and/or described scramble initial value, sends or detects corresponding D2D signal; Wherein, D2D signal refers to D2D data transfer signal, and/or D2D finds signal.

In the third D2D system, the equipment of transfer of data comprises: lock unit, sequence and scramble initial value generation unit, D2D signal processing unit.

Wherein, lock unit, for synchronous detection, and receives the broadcast message of eNB or D2D UE.Sequence and scramble initial value generation unit, for determining the parameter of D2D burst, DMRS sequence and D2D signal scrambling code initial value according to broadcast message, the sequence adopted when generating transmission D2D signal and scramble initial value.D2D signal processing unit, for according to the described sequence determined and scramble initial value, sends or detects corresponding D2D signal.

The application finds the feature of signal for D2D system synchronization, proposition utilizes synchronisation source or bunch id information generate DMRS and find signal initial value, reduce different districts, the D2D inter-signal interference of different bunches, while guarantee D2D Signal reception scope, reduce D2D signal blind check number of times, improve uplink spectrum utilance, save D2D power consumption.

The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within the scope of protection of the invention.

Claims (23)

1. the method for transfer of data in D2D system, is characterized in that, comprising:

A, D2D UE detects the signal of synchronisation source, for the transmission of arbitrary D2D signal, completes synchronizing process according in the synchronisation source detected;

B, D2D UE, according to the information of the synchronisation source detected, determines the parameter of sequence and/or the scramble initial value adopted when transmitting described D2D signal; Generate described sequence and/or described scramble initial value according to the parameter determined, and send or detect corresponding D2D signal; Described D2D signal refers to that physics D2D synchronizing channel, D2D data transfer signal and/or D2D find signal, and described D2D data transfer signal comprises D2D data controlling signal and/or D2D data traffic signals.

2. method according to claim 1, it is characterized in that, the described sequence determined according to the information of described synchronisation source in step B and/or the parameter of scramble initial value are: the sequence adopted when transmitting physical D2D synchronous channel signal, D2D find signal and/or D2D data controlling signal and/or the parameter of scramble initial value;

Step B comprises further: according to the information in physics D2D synchronous channel signal, D2D discovery signal and/or D2D data controlling signal, determine the parameter of sequence and/or the scramble initial value adopted when transmitting D2D data traffic signals, and send after generating relevant parameter or detect described D2D data traffic signals.

3. method according to claim 2, it is characterized in that, according to the scrambler that the information of described synchronisation source is selected or will be preset from the N number of scrambler preset, as scrambler when transmitting physical D2D synchronous channel signal, D2D discovery signal and/or D2D data controlling signal; And/or,

ID entrained by the dispatching distribution comprised according to D2D data controlling signal in step B, determines the parameter of sequence and/or the scramble initial value adopted when transmitting D2D data traffic signals.

4. method according to claim 1, is characterized in that, forbids that group is jumped and sequence is jumped when described D2D UE generates DMRS or scramble initial value; And/or,

When described D2D UE generates described scrambler, subframe or slot index are set to fixed value; And/or,

By the skew relative to benchmark subframe or time slot of the transmission subframe of described D2D signal or time slot, be defined as subframe when generating described sequence or scrambler or slot index; And/or,

If described D2D Signal transmissions adopts TTI to bundle mode, the sequence number in all subframes or time slot of a TTI binding scheduling by described D2D signal place subframe or time slot, is defined as the subframe that uses when generating described sequence or scrambler or slot index.

5. method according to claim 4, is characterized in that, described benchmark subframe or time slot are: the subframe or the time slot that send synchronizing signal, or, first subframe in dispatching distribution configuration cycle or first time slot.

6. method according to claim 1, is characterized in that, by the sequence number of the subframe of the described D2D signal of transmission in the subframe of one group of actual transmissions D2D signal of setting, is defined as subframe when generating described sequence or scrambler or slot index.

7. the method for transfer of data in D2D system, is characterized in that, comprising:

E, D2D UE synchronously detects, and obtains bunch ID;

F, D2D UE, according to bunch ID obtained, determines the parameter of sequence and/or the scramble initial value adopted when transmitting D2D signal; Generate described sequence and/or scramble initial value according to the parameter determined, and send or detect corresponding D2D signal; Described D2D signal refers to that physics D2D synchronous channel signal, D2D data transfer signal and/or D2D find signal, and described D2D data transfer signal comprises D2D data controlling signal and/or D2D data traffic signals.

8. method according to claim 7, it is characterized in that, when described bunch of ID is ID in dispatching distribution, if described D2D UE does not have base station to assist, then the mode of described D2D UE acquisition bunch ID is: described D2D UE selects ID in a SA inside ID collection in public dispatching distribution SA, as described bunch of ID.

9. method according to claim 7, is characterized in that, when in described step e, D2D UE receives multiple bunches of id informations, step F determines sequence and/or the scramble initial value of D2D signal on different sub frames according to different bunch ID or same cluster ID; Wherein the corresponding relation of subframe and bunch ID is determined by D2D UE or prespecified.

10. method according to claim 7, is characterized in that, the described sequence determined according to described bunch of ID in step F and/or the parameter of scramble initial value are: the discovery sequence adopted during transmission D2D data traffic signals and/or the parameter of scramble initial value;

The scrambler that transmitting physical D2D synchronous channel signal, D2D adopt when finding signal and/or D2D data controlling signal is set to constant.

11. methods according to claim 7, is characterized in that, described bunch of ID is ID in SA;

Described D2D UE generates the DMRS sequence of the described D2D signal of transmission according to ID in described SA, and described DMRS sequence comprises root sequence and cyclic shift.

12. methods according to claim 11, is characterized in that,

Utilize each value of ID in described SA to being applied to the Δ generating described sequence _ssdifferent values; And/or,

The Δ of some bit correspondence instructions for generating described sequence utilizing ID in described SA to take _ssdifferent values; And/or,

Utilize to ID in described SA according to the result after set point delivery as the Δ for generating described sequence _ss; And/or,

Utilize the different values of the corresponding described cyclic shift of each value of ID in described SA; And/or,

The different values of the described cyclic shift of some bit correspondence instructions utilizing ID in described SA to take; And/or,

To utilize in described SA ID according to the value of the result after set point delivery as described cyclic shift; And/or,

The value of described cyclic shift is set to fixed value.

13. methods according to claim 12, is characterized in that, described cyclic shift is the α defined in 3GPP TS36.211, or described cyclic shift is high-rise and the cyclic shift signaling of physical layer signaling notice with

14. methods according to claim 11, is characterized in that, described DMRS sequence comprises orthogonal mask OCC further;

Random selecting or determine the sequence number of described OCC according to the ID in described SA.

15. methods according to claim 7, is characterized in that, forbid that group is jumped and sequence is jumped when described D2D UE generates DMRS or scramble initial value; And/or,

When described D2D UE generates described scrambler, subframe or slot index are set to fixed value; And/or,

By the skew relative to benchmark subframe or time slot of the transmission subframe of described D2D signal or time slot, be defined as subframe when generating described sequence or scrambler or slot index; And/or,

If described D2D Signal transmissions adopts TTI to bundle mode, the sequence number in all subframes or time slot of a TTI binding scheduling by described D2D signal place subframe or time slot, is defined as the subframe that uses when generating described sequence or scrambler or slot index.

16. methods according to claim 15, is characterized in that, described benchmark subframe or time slot are: the subframe or the time slot that send synchronizing signal, or, first subframe in dispatching distribution configuration cycle or first time slot.

17. methods according to claim 7, is characterized in that, by the sequence number of the subframe of the described D2D signal of transmission in the subframe of one group of actual transmissions D2D signal of setting, are defined as subframe when generating described sequence or scrambler or slot index.

The method of transfer of data in 18. 1 kinds of D2D systems, is characterized in that, comprising:

D2D UE Stochastic choice or according to parameter or base station signal deployment, determines the cyclic shift parameter alpha and/or the sequence group number u relevant parameter that generate DMRS; And according to the α determined and/or sequence group number u relevant parameter, the DMRS adopted when generating transmission D2D signal.

19. methods according to claim 18, is characterized in that, forbid that group is jumped and sequence is jumped when described D2D UE generates DMRS.

The method of transfer of data in 20. 1 kinds of D2D systems, is characterized in that, comprising:

D2D UE detects synchronisation source, receives the broadcast message of eNB or D2D UE;

Described D2D UE determines the parameter of D2D burst, DMRS sequence and D2D signal scrambling code initial value according to the broadcast message received, and the sequence adopted when generating transmission D2D signal and scramble initial value, send or detect corresponding D2D signal.

The equipment of transfer of data in 21. 1 kinds of D2D systems, is characterized in that, comprising: lock unit, sequence and scramble initial value generation unit, D2D signal processing unit;

Described lock unit, for detecting the signal of synchronisation source, for the transmission of arbitrary D2D signal, completes synchronizing process according in the synchronisation source detected;

Described sequence and scramble initial value generation unit, for the synchronisation source information detected according to described lock unit, determine the parameter of sequence and/or the scramble initial value adopted when transmitting D2D signal; Described sequence and/or described scramble initial value is generated according to the parameter determined;

Described D2D signal processing unit, for according to the described sequence generated and/or described scramble initial value, sends or detects corresponding D2D signal; Wherein, described D2D signal refers to D2D data transfer signal, and/or D2D finds signal.

The equipment of transfer of data in 22. 1 kinds of D2D systems, is characterized in that, comprising: lock unit, sequence and scramble initial value generation unit, D2D signal processing unit;

Described lock unit, for synchronously detecting, and obtains bunch ID;

Described sequence and scramble initial value generation unit, for according to bunch ID obtained, determine the parameter of sequence and/or the scramble initial value adopted when transmitting D2D signal, and generate described sequence and/or scramble initial value according to the parameter determined;

Described D2D signal processing unit, for according to the described sequence generated and/or described scramble initial value, sends or detects corresponding D2D signal; Wherein, described D2D signal refers to D2D data transfer signal, and/or D2D finds signal.

The equipment of transfer of data in 23. 1 kinds of D2D systems, is characterized in that, comprising: lock unit, sequence and scramble initial value generation unit, D2D signal processing unit;

Described lock unit, for detecting synchronisation source, and receives the broadcast message of eNB or D2D UE;

Described sequence and scramble initial value generation unit, for determining the parameter of D2D burst, DMRS sequence and D2D signal scrambling code initial value according to described broadcast message, the sequence adopted when generating transmission D2D signal and scramble initial value;

Described D2D signal processing unit, for according to the described sequence determined and scramble initial value, sends or detects corresponding D2D signal.