CN104883728B - Transmission method and device in a kind of D2D communication - Google Patents

Transmission method and device in a kind of D2D communication Download PDF

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Publication number
CN104883728B
CN104883728B CN201410070394.8A CN201410070394A CN104883728B CN 104883728 B CN104883728 B CN 104883728B CN 201410070394 A CN201410070394 A CN 201410070394A CN 104883728 B CN104883728 B CN 104883728B
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Prior art keywords
synchronization signal
synchronous
synchronization
assistance messages
power
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CN104883728A (en
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张晓博
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Honor Device Co Ltd
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Shanghai Langbo Communication Technology Co Ltd
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04WWIRELESS COMMUNICATION NETWORKS
    • H04W56/00Synchronisation arrangements
    • H04W56/001Synchronization between nodes
    • H04W56/0015Synchronization between nodes one node acting as a reference for the others
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks

Abstract

The invention discloses the transmission methods and device in a kind of D2D communication.For D2D communication in how to select D2D synchronization signal to ensure this problem of the precision of D2D synchronization timing, D2D sends the synchronous auxiliary information auxiliary D2D reception UE of UE transmission and selects suitable D2D synchronization signal as synchronous reference, as one embodiment, the synchronous auxiliary information includes that flag bit is used to indicate whether corresponding D2D synchronization signal can be used for synchronous reference, if it is not, D2D, which receives UE, does not select the D2D synchronization signal.The present invention considers the quality of reception assisted Selection synchronous reference of D2D synchronization signal, has preferable precision.The synchronization auxiliary information that the present invention designs simultaneously provides several optional information combinations, suitable for different redundancy/synchronization accuracy demands.

Description

Transmission method and device in a kind of D2D communication
Technical field
The present invention relates to device to device (D2D-Device to Device) communication in synchronization scheme, more particularly to Synchronization scheme based on long term evolution (LTE-Long Term Evolution) D2D.
Background technique
Traditional third generation cooperative partner program (3GPP-3rd Generation Partner Project) long term evolution In (LTE-Long Term Evolution) system, data transmission occurs in base station and user equipment (UE-User Equipment between).In 3GPP R12, device is set up the project and is subject to device (D2D-Device to Device) communication It discusses, the essential characteristic of D2D is that the data between UE is allowed to transmit.D2D, which sends UE, can send D2D synchronizing sequence (D2DSS- D2D Synchronization Sequence) and D2D synchronizing channel (D2DSCH-D2D Synchronization Channel the D2D reception UE for) being, which can be obtained, sends the synchronous of UE with the D2D.
If the UE of D2D communication receives multiple D2DSS, need that optimal sending as its D2D is therefrom selected to determine When synchronous reference.3GPP is in the conclusion that the 76th meeting (RAN1#76) of the first working group of wireless access network is reached: if its All, the D2DSS for selecting the quality of reception best is as synchronous reference for his condition.Further, there are one sides to be discussed Case: if other conditions all, select the highest D2DSS of synchronization level as synchronous reference.The synchronization of synchronization signal Grade is a term for identifying the priority of synchronization signal.Synchronous reference is meant that: it is same that the sending time of D2DSS is equal to it The receiving time of step reference adds an offset.Synchronisation source is meant that: the synchronisation source of D2DSS is the synchronous reference of D2DSS Sender.Initial synchronisation source is meant that: the initial synchronisation source of D2DSS is the transmission of the synchronous reference of the most original of D2DSS Person
For example, main synchronizing sequence (PSS-Primary Synchronization Sequence)/auxiliary synchronization that eNB is sent The synchronization level of sequence (SSS-Secondary Synchronization Sequence) is 0, first in the eNB covering UE send D2DSS synchronization level be 1, synchronisation source is that the D2DSS(of the first UE is sent by the 2nd UE) synchronization level be 2. The eNB is the initial synchronisation source of the 2nd UE, and having 2 grades of links-between the 2nd UE and initial synchronisation source is eNB to the first UE respectively And the first UE to the 2nd UE.
For the D2DSS of different synchronization levels and the quality of reception, how to select suitable D2DSS as synchronous reference, be A problem to be solved.The present invention discloses solution for this problem.
Summary of the invention
The invention discloses a kind of methods in user equipment (UE-User Equipment), wherein including walking as follows It is rapid:
Step A. determines synchronous assistance messages
Step B. sends D2D synchronization signal and indicates synchronous assistance messages
Wherein, the synchronous assistance messages include at least one of:
Flag bit, identifies whether the D2D synchronization signal can be used as synchronous reference
Power threshold
Time threshold.
As one embodiment, the unit of the power threshold is decibel or milli decibel, the unit of the time threshold It is microsecond.
Specifically, according to an aspect of the present invention, which is characterized in that the power threshold is the described of the UE suggestion D2D synchronization signal can be used as the minimal detectable power of synchronous reference in receiving end.
Specifically, according to an aspect of the present invention, which is characterized in that the power threshold is the described of the UE suggestion For D2D synchronization signal in the maximal received power of target UE, the target UE is the UE that can send D2D synchronization signal.
Specifically, according to an aspect of the present invention, which is characterized in that if the synchronisation source of the D2D synchronization signal is The UE, the time threshold are 0;If the synchronisation source of the D2D synchronization signal is base station, the time threshold is the UE The estimation time difference obtained according to the downlink signal of the base station;If the synchronisation source of the D2D synchronization signal is other UE, institute Stating time threshold is estimation time difference other UE plus described in that the UE is obtained according to the D2D synchronization signal of other UE The time threshold of D2D synchronization signal instruction.
As one embodiment, estimate that the calculation method of time difference is as follows, UE is using relevant detection or noncoherent detection Algorithm detects synchronization signal (sending UE from base station or D2D), further calculates out the reference signal of the synchronization signal It receives power (RSRP-Reference Signal Reception Power), i.e., the resource particle that the described synchronization signal occupies The mean receiving power of (RE-Resource Element), according to method determination of the RSRP using lookup table Corresponding institute under the conditions of RSRP and specific cumulative distribution function (CDF-Cumulative Distribution Function) The time absolute value of the difference between the arrival time of synchronization signal and actual time of arrival is stated as the estimation time difference.
Specifically, above-mentioned aspect according to the present invention, which is characterized in that the D2D synchronization signal includes D2D synchronizing sequence With D2D synchronous information block, the D2D synchronizing sequence includes at least one of:
- ZC(ZadOff-Chu) sequence
Pseudo-random sequence.
If the synchronous assistance messages include the power threshold, the power threshold is by the D2D synchronous information block It carries;If the synchronous assistance messages include the time threshold, the time threshold is taken by the D2D synchronous information block Band;If the synchronous assistance messages include the flag bit, the flag bit is by the D2D synchronizing sequence or the D2D Synchronous information block carries.
The invention discloses a kind of methods in UE, wherein includes the following steps:
Step A. receives K group D2D synchronization signal and obtains the synchronous assistance messages of K group, wherein detection D2D synchronization signal DkIt obtains Assistance messages M must be synchronizedk, k is the positive integer from 1 to K, and the K is greater than 1 positive integer.
Step B. determines D2D transmission timing, the synchronous ginseng of the D2D transmission timing according to the synchronous assistance messages of the K group Examine is following one:
1. object synchronization signal of option, the object synchronization signal are one in the K group D2D synchronization signal
What UE described in option 2. was voluntarily determined
Step C. sends D2D signal according to the D2D transmission timing
Wherein, the UE is in outside MPS process, the MkIncluding at least one of:
Flag bit Fk, identify the DkWhether synchronous reference can be used as
Power threshold Pk
Time threshold Tk
Specifically, according to an aspect of the present invention, which is characterized in that if meeting one of the following conditions, the synchronization With reference to being the option 2, i.e., the described UE voluntarily determines the D2D transmission timing:
-F1..., FKSynchronous reference cannot be used as by identifying corresponding synchronization signal
The D1..., DKThe reception power in the UE be respectively smaller than P1..., PK
Specifically, according to an aspect of the present invention, which is characterized in that the D2D synchronization signal includes D2D synchronizing sequence With D2D synchronous information block, the D2D synchronizing sequence includes at least one of:
- ZC sequence
Pseudo-random sequence.
If the synchronous assistance messages include the power threshold, the power threshold is by the D2D synchronous information block It carries;If the synchronous assistance messages include the time threshold, the time threshold is taken by the D2D synchronous information block Band;If the synchronous assistance messages include the flag bit, the flag bit is by the D2D synchronizing sequence or the D2D Synchronous information block carries.
Specifically, according to an aspect of the present invention, which is characterized in that the synchronous reference is the option 1, the mesh Marking synchronization signal is following one:
The flag bit, which is identified as, can be used as the highest synchronization signal of synchronization level in the synchronization signal of synchronous reference The best synchronization signal of the middle quality of reception
The synchronization level for receiving power and being greater than in the synchronization signal of the corresponding power threshold of the synchronization signal received The best synchronization signal of the quality of reception in highest synchronization signal
The smallest D2D synchronization signal of synchronization time difference in the K group D2D synchronization signal.The synchronization time difference is described UE adds the corresponding time threshold according to the estimation time difference that the quality of reception of the D2D synchronization signal determines.
Specifically, above-mentioned aspect according to the present invention, which is characterized in that if the synchronous reference is the option 2, institute Stating D2D signal includes the D2D synchronization signal.
Specifically, above-mentioned aspect according to the present invention, which is characterized in that if the synchronous reference be the option 1 and The power threshold that receives power be less than the object synchronization signal of the object synchronization signal in the UE, the D2D signal It does not include the D2D synchronization signal.
The invention discloses a kind of user equipmenies, which is characterized in that the equipment includes:
First module: for determining synchronous assistance messages
Second module: synchronous assistance messages are indicated for sending D2D synchronization signal
Wherein, the synchronous assistance messages include at least one of:
Flag bit, identifies whether the D2D synchronization signal can be used as synchronous reference
Power threshold
Time threshold.
As one embodiment, above equipment is characterized in that, the power threshold is following one:
The D2D synchronization signal that the UE suggests can be used as the minimal detectable power of synchronous reference in receiving end
For the D2D synchronization signal that the UE suggests in the maximal received power of target UE, the target UE is can to send out Send the UE of D2D synchronization signal.
The invention discloses a kind of user equipmenies, which is characterized in that the equipment includes:
First module: the synchronous assistance messages of K group are obtained for receiving K group D2D synchronization signal, wherein the synchronous letter of detection D2D Number DkObtain synchronous assistance messages Mk, k is the positive integer from 1 to K, and the K is greater than 1 positive integer.
Second module: for determining D2D transmission timing according to the synchronous assistance messages of the K group, the D2D transmission timing Synchronous reference is following one:
1. object synchronization signal of option, the object synchronization signal are one in the K group D2D synchronization signal
What UE described in option 2. was voluntarily determined
Third module: for sending D2D signal according to the D2D transmission timing
Wherein, the UE is in outside MPS process, the MkIncluding at least one of:
Flag bit Fk, identify the DkWhether synchronous reference can be used as
Power threshold Pk
Time threshold Tk
As one embodiment, above equipment is characterized in that, if meeting one of the following conditions, the synchronous reference is The option 2, i.e., the described UE voluntarily determine the D2D transmission timing:
-F1..., FKSynchronous reference cannot be used as by identifying corresponding synchronization signal
The D1..., DKThe reception power in the UE be respectively smaller than P1..., PK
As another embodiment, above equipment is characterized in that, the synchronous reference is the option 1, the target Synchronization signal is following one:
The flag bit, which is identified as, can be used as the highest synchronization signal of synchronization level in the synchronization signal of synchronous reference The best synchronization signal of the middle quality of reception
The synchronization level for receiving power and being greater than in the synchronization signal of the corresponding power threshold of the synchronization signal received The best synchronization signal of the quality of reception in highest synchronization signal
The smallest D2D synchronization signal of synchronization time difference in the K group D2D synchronization signal.The synchronization time difference is described UE adds the corresponding time threshold according to the estimation time difference that the quality of reception of the D2D synchronization signal determines.
For D2D communication in how to select D2D synchronization signal to ensure this problem of the precision of D2D synchronization timing, this hair The bright transmission method and device disclosed in a kind of D2D communication.D2D sends UE and sends synchronous auxiliary information auxiliary D2D reception UE Select suitable D2D synchronization signal as synchronous reference, as one embodiment, the synchronous auxiliary information includes that flag bit is used In indicating whether corresponding D2D synchronization signal can be used for synchronous reference, if it is not, D2D, which receives UE, does not select the D2D Synchronization signal.The present invention considers the quality of reception assisted Selection synchronous reference of D2D synchronization signal, has preferable precision.Together When the synchronization auxiliary information that designs of the present invention provide several optional information combinations, suitable for different redundancy/synchronize essence The demand of degree.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, of the invention other Feature, objects and advantages will become more apparent:
Fig. 1 shows the flow chart of determining D2D transmission timing according to an embodiment of the invention;
Fig. 2 shows the schematic diagrames of D2D synchronization signal according to an embodiment of the invention selection;
Fig. 3 shows showing for the selection of the D2D synchronization signal under multiple synchronization levels according to an embodiment of the invention It is intended to;
Fig. 4 shows the processing unit structural block diagram in D2D user equipment according to an embodiment of the invention;
Fig. 5 shows the processing unit structural block diagram in D2D user equipment according to still another embodiment of the invention;
Specific embodiment
Technical solution of the present invention is described in further detail below in conjunction with attached drawing, it should be noted that do not rushing In the case where prominent, the feature in embodiments herein and embodiment can be arbitrarily combined with each other.
Embodiment 1
Embodiment 1 illustrates the flow chart of determining D2D transmission timing, as shown in Fig. 1.In attached drawing 1, UE U1 and UE U3 It is two UE for sending D2D synchronization signal, UE U2 is the UE for carrying out D2D transmission timing.
For UE U1, in step s 11, determine synchronous assistance messages M1;In step s 12, D2D synchronization signal D is sent1 Indicate synchronous assistance messages M1
For UE U3, in step S31, determine synchronous assistance messages M2;In step s 32, D2D synchronization signal D is sent2 Indicate synchronous assistance messages M2
For UE U2, in the step s 21, receive 2 groups of D2D synchronization signal D1And D2Obtain 2 groups of synchronous assistance messages M1With M2, wherein detection D2D synchronization signal DkObtain synchronous assistance messages Mk, k is the positive integer from 1 to 2;In step S22, according to Described 2 groups synchronous assistance messages determine D2D transmission timing;In step S23, according to the D2D transmission timing, D2D letter is sent Number.
In embodiment 1, UE U2 is in except MPS process, and the synchronous assistance messages include at least one of:
Flag bit, identifies whether the D2D synchronization signal can be used as synchronous reference
Power threshold
Time threshold.
The synchronous reference of the D2D transmission timing is following one:
1. object synchronization signal of option, the object synchronization signal are one in the K group D2D synchronization signal
What UE described in option 2. was voluntarily determined
As a sub- embodiment of embodiment 1, the synchronous assistance messages include the flag bit,
The concrete methods of realizing of step S22 in UE U2 is as follows:
If D1And D2In flag bit identify corresponding synchronization signal and cannot be used as synchronous reference, the D2D is sent The synchronous reference of timing is the option 2;If D1And D2In have and the synchronous letter accordingly of the mark bit identification contained by only one Number it can be used as synchronous reference, then corresponding synchronization signal is the synchronous reference of the D2D transmission timing;If D1And D2 In flag bit identify corresponding synchronization signal and can be used as synchronous reference, then the synchronous reference of the D2D transmission timing is D1And D2The best synchronization signal of the quality of reception in the middle highest synchronization signal of synchronization level, i.e., if D1And D2Synchronization level It is different then select high that of synchronization level, if identical, select good that of the quality of reception.
The concrete methods of realizing of step S11 in UE U1 is as follows:
If D1Synchronisation source be sending device except UE U1, UE U1 is according to the D received1Synchronous reference connect It receives quality and determines D1If flag bit-the quality of reception in is lower than certain threshold, D1In mark bit identification D1Cannot by with It is on the contrary then can be used for synchronous reference in synchronous reference, according to D1Synchronisation source synchronization level, the certain threshold may not Together, such as synchronization level is smaller (closer to base station), and the certain threshold is lower;If D1Synchronisation source be UE U1 oneself, UE U1 voluntarily determines D according to its transmission state, movement velocity, power overhead etc.1In flag bit.
Embodiment 2
Embodiment 2 illustrates the schematic diagram of D2D synchronization signal selection, as shown in Fig. 2.In embodiment 2, UE U4, UE U5 and UE U6 is three UE for sending D2D synchronization signal, and UE U7 is the UE for carrying out D2D transmission timing.
For UE U4, it is first determined synchronous assistance messages M1, then send D2D synchronization signal D1Indicate synchronous assistance messages M1
For UE U5, it is first determined synchronous assistance messages M2, then send D2D synchronization signal D2Indicate synchronous assistance messages M2
For UE U6, it is first determined synchronous assistance messages M3, then send D2D synchronization signal D3Indicate synchronous assistance messages M3
For UE U7, receive first 3 groups of D2D synchronization signals obtain 3 groups of synchronous assistance messages (S47, S57 in such as attached drawing 2, Shown in S67), wherein detection D2D synchronization signal DkObtain synchronous assistance messages Mk, k is the positive integer from 1 to 3;Then according to institute It states 3 groups of synchronous assistance messages and determines D2D transmission timing;Finally according to the D2D transmission timing, D2D signal is sent.
In embodiment 2, UE U7 is in outside MPS process, and the synchronous reference of the D2D transmission timing is following one:
1. object synchronization signal of option, the object synchronization signal are one in 3 groups of D2D synchronization signals
What UE described in option 2. was voluntarily determined
The MkIncluding at least one of:
Flag bit Fk, identify the DkWhether synchronous reference can be used as
Power threshold Pk
Time threshold Tk
As a sub- embodiment of embodiment 2, the MkIncluding power threshold Pk, the power threshold is to send UE to build The D2D synchronization signal of view can be used as the minimal detectable power of synchronous reference in receiving end.In attached drawing 2, P1, P2, P3Respectively UE U4 is identified, the D2D synchronization signal that U5, U6 suggest can be used for reference to synchronous range-respectively such as circle of dotted line C4, C5, C6 It is shown.UE U7 is according to D1, D2, D3Reception power be respectively smaller than P1, P2, P3Determination will voluntarily determine that D2D transmission timing-is described Option 2.
As another sub- embodiment of embodiment 2, the MkIncluding power threshold PkWith flag bit Fk, the power-threshold Value is maximal received power of the D2D synchronization signal in target UE for sending UE suggestion, and the target UE is can to send D2D to synchronize The UE of signal.UE U7 is according to flag bit FkDetermine the synchronous reference (specific steps reference implementation example 1) of D2D transmission timing, UE U7 is according to D1, D2, D3Reception power be respectively smaller than P1, P2, P3Determine that it can send D2D synchronization signal.That is what UE U7 was sent In the D2D synchronization signal sent comprising D2D synchronization signal for receiving end-UE U7 synchronous with UE U7 holding in D2D signal Maximal received power of the D2D synchronization signal in target UE that its suggestion is indicated including power threshold, as shown in circle of dotted line C7.
Embodiment 3
Embodiment 3 illustrates the schematic diagram of the selection of the D2D synchronization signal under multiple synchronization levels, as shown in Fig. 3.Attached drawing In 3, UE U10, UE U11, UE U13 are sending D2D synchronization signal, and wherein UE U10 and UE U11 voluntarily determines that its D2D is sent out Send timing, UE U10 is the synchronisation source for the D2D synchronization signal that UE U11 is sent (as shown in S101).UE U12 is detected simultaneously by UE The D2D synchronization signal that U10, UEU11, UE U13 are sent.
For UE U12,3 groups of D2D synchronization signal D are received first1(shown in S102), D2(shown in S112), D3(S132 institute Show) 3 groups of synchronous assistance messages are obtained, wherein detection D2D synchronization signal DkObtain synchronous assistance messages Mk, k is just whole from 1 to 3 Number;Then D2D transmission timing is determined according to described 3 groups synchronous assistance messages;Finally according to the D2D transmission timing, D2D is sent Signal.
In embodiment 3, the MkIncluding time threshold Tk, wherein T1, T3It is all 0, T2Equal to T1In addition estimation time difference, institute Stating the estimation time difference is UE U11 according to D2Synchronous reference (shown in S101) received signal quality itself and the UE U10 that determine Synchronization time difference.
The synchronous reference of the D2D transmission timing is that the smallest D2D of synchronization time difference is same in 3 groups of D2D synchronization signals Walk signal.The synchronization time difference is UE U12 according to DkThe quality of reception determine the estimation time difference add Tk
Embodiment 4
Embodiment 4 illustrates the processing unit structural block diagram in D2D user equipment, as shown in Fig. 4.In attached drawing 4, at UE Reason device 300 is by determining module 301, and sending module 302 forms.
Determining module 301 is for determining synchronous assistance messages;Sending module 302 is same for sending the instruction of D2D synchronization signal Walk assistance messages.
Wherein, the synchronous assistance messages include at least one of:
Flag bit, identifies whether the D2D synchronization signal can be used as synchronous reference
Power threshold
Time threshold.
The D2D synchronization signal includes D2D synchronizing sequence and D2D synchronous information block, and the D2D synchronizing sequence includes following At least one:
- ZC sequence
Pseudo-random sequence.
If the synchronous assistance messages include the power threshold, the power threshold is by the D2D synchronous information block It carries;If the synchronous assistance messages include the time threshold, the time threshold is taken by the D2D synchronous information block Band;If the synchronous assistance messages include the flag bit, the flag bit is by the D2D synchronizing sequence or the D2D Synchronous information block carries.
Embodiment 5
Embodiment 5 illustrates the processing unit structural block diagram in D2D user equipment, as shown in Fig. 5.In attached drawing 5, at UE Reason device 400 is by receiving module 401, determining module 402, and sending module 403 forms.
Receiving module 401 obtains the synchronous assistance messages of K group for receiving K group D2D synchronization signal, wherein detection D2D is synchronous Signal DkObtain synchronous assistance messages Mk, k is the positive integer from 1 to K, and the K is greater than 1 positive integer.
Determining module 402 is used to determine D2D transmission timing, the D2D transmission timing according to the synchronous assistance messages of the K group Synchronous reference be following one:
1. object synchronization signal of option, the object synchronization signal are one in the K group D2D synchronization signal
What UE described in option 2. was voluntarily determined
Sending module 403 is used to send D2D signal according to the D2D transmission timing
In embodiment 5, the UE is in outside MPS process, the MkIncluding at least one of:
Flag bit Fk, identify the DkWhether synchronous reference can be used as
Power threshold Pk
Time threshold Tk
The synchronous reference is the option 1, and the object synchronization signal is following one:
The flag bit, which is identified as, can be used as the highest synchronization signal of synchronization level in the synchronization signal of synchronous reference The best synchronization signal of the middle quality of reception
The synchronization level for receiving power and being greater than in the synchronization signal of the corresponding power threshold of the synchronization signal received The best synchronization signal of the quality of reception in highest synchronization signal
The smallest D2D synchronization signal of synchronization time difference in the K group D2D synchronization signal.The synchronization time difference is described UE adds the corresponding time threshold according to the estimation time difference that the quality of reception of the D2D synchronization signal determines.
Those of ordinary skill in the art will appreciate that all or part of the steps in the above method can be referred to by program Related hardware is enabled to complete, described program can store in computer readable storage medium, such as read-only memory, hard disk or light Disk etc..Optionally, one or more integrated circuit can be used also to realize in all or part of the steps of above-described embodiment.Phase It answers, each modular unit in above-described embodiment, can be realized using example, in hardware, it can also be by the form of software function module It realizes, the application is not limited to the combination of the software and hardware of any particular form.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.It is all Within the spirit and principles in the present invention, any modification made, equivalent replacement, improve etc., it should be included in protection of the invention Within the scope of.

Claims (14)

1. a kind of method in UE, wherein include the following steps:
Step A. determines synchronous assistance messages;
Step B. sends D2D synchronization signal and indicates synchronous assistance messages;
Wherein, the synchronous assistance messages include at least one of:
Flag bit, identifies whether the D2D synchronization signal can be used as synchronous reference;
Power threshold, the power threshold are that the D2D synchronization signal that the UE suggests can be used as synchronizing in receiving end The minimal detectable power of reference;
Time threshold.
2. the method according to claim 1, wherein the power threshold is that the D2D that the UE suggests is same Signal is walked in the maximal received power of target UE, the target UE is the UE that can send D2D synchronization signal.
3. the method according to claim 1, wherein if the synchronisation source of the D2D synchronization signal is the UE, The time threshold is 0;If the synchronisation source of the D2D synchronization signal is base station, the time threshold is the UE according to institute State the estimation time difference that the downlink signal of base station obtains;If the synchronisation source of the D2D synchronization signal is other UE, the time Threshold value is that the estimation time difference that the UE is obtained according to the D2D synchronization signal of other UE is same plus the D2D of other UE Walk the time threshold of signal designation.
4. according to claim 1, method described in 2,3 any one, which is characterized in that the D2D synchronization signal includes D2D same Step sequence and D2D synchronous information block, the D2D synchronizing sequence includes at least one of:
- ZC sequence;
Pseudo-random sequence;
If the synchronous assistance messages include the power threshold, the power threshold is carried by the D2D synchronous information block; If the synchronous assistance messages include the time threshold, the time threshold is carried by the D2D synchronous information block;If The synchronous assistance messages include the flag bit, and the flag bit is by the D2D synchronizing sequence or the D2D synchronizing information Block carries.
5. a kind of method in UE, wherein include the following steps:
Step A. receives K group D2D synchronization signal and obtains the synchronous assistance messages of K group, wherein detection D2D synchronization signal DkIt is synchronized Assistance messages Mk, k is the positive integer from 1 to K, and the K is greater than 1 positive integer;
Step B. determines D2D transmission timing according to the synchronous assistance messages of the K group, and the synchronous reference of the D2D transmission timing is Following one:
1. object synchronization signal of option, the object synchronization signal are one in the K group D2D synchronization signal;
What UE described in option 2. was voluntarily determined;
Step C. sends D2D signal according to the D2D transmission timing;
Wherein, the UE is in outside MPS process, the MkIncluding at least one of:
Flag bit Fk, identify the D2D synchronization signal DkWhether synchronous reference can be used as;
Power threshold Pk
Time threshold Tk
6. according to the method described in claim 5, it is characterized in that, if meeting one of the following conditions, the synchronous reference is The option 2, i.e., the described UE voluntarily determine the D2D transmission timing:
-F1..., FKSynchronous reference cannot be used as by identifying corresponding synchronization signal;
-D1..., DKThe reception power in the UE be respectively smaller than P1..., PK
7. according to the method described in claim 5, it is characterized in that, the D2D synchronization signal includes D2D synchronizing sequence and D2D Synchronous information block, the D2D synchronizing sequence includes at least one of:
- ZC sequence;
Pseudo-random sequence;
If the synchronous assistance messages include the power threshold, the power threshold is carried by the D2D synchronous information block; If the synchronous assistance messages include the time threshold, the time threshold is carried by the D2D synchronous information block;If The synchronous assistance messages include the flag bit, and the flag bit is by the D2D synchronizing sequence or the D2D synchronizing information Block carries.
8. according to method described in 5,6,7 any one of claim, which is characterized in that the synchronous reference is the option 1, The object synchronization signal is following one:
The flag bit, which is identified as, can be used as connecing in the highest synchronization signal of synchronization level in the synchronization signal of synchronous reference Receive top-quality synchronization signal;
The synchronization level highest for receiving power and being greater than in the synchronization signal of the corresponding power threshold of the synchronization signal received Synchronization signal in the best synchronization signal of the quality of reception;
The smallest D2D synchronization signal of synchronization time difference in the K group D2D synchronization signal, the synchronization time difference are the UE roots The corresponding time threshold is added according to the estimation time difference that the quality of reception of the D2D synchronization signal determines.
9. according to method described in 5,6,7 any one of claim, which is characterized in that if the synchronous reference is the choosing Item 2, the D2D signal includes the D2D synchronization signal.
10. according to method described in claim 5,7 any one, which is characterized in that if the synchronous reference is the choosing The power threshold for receiving power and being less than the object synchronization signal of item 1 and the object synchronization signal in the UE, the D2D Signal does not include the D2D synchronization signal.
11. a kind of user equipment, which is characterized in that the equipment includes:
First module: for determining synchronous assistance messages;
Second module: synchronous assistance messages are indicated for sending D2D synchronization signal;
Flag bit, identifies whether the D2D synchronization signal can be used as synchronous reference;
Power threshold;
Time threshold;
The power threshold is following one:
The D2D synchronization signal that-UE suggests can be used as the minimal detectable power of synchronous reference in receiving end;
For the D2D synchronization signal that the UE suggests in the maximal received power of target UE, the target UE is can to send The UE of D2D synchronization signal.
12. a kind of user equipment, which is characterized in that the equipment includes:
First module: the synchronous assistance messages of K group are obtained for receiving K group D2D synchronization signal, wherein detection D2D synchronization signal DkIt obtains Assistance messages M must be synchronizedk, k is the positive integer from 1 to K, and the K is greater than 1 positive integer;
Second module: for determining D2D transmission timing, the synchronization of the D2D transmission timing according to the synchronous assistance messages of the K group With reference to being following one:
1. object synchronization signal of option, the object synchronization signal are one in the K group D2D synchronization signal;
What option 2.UE was voluntarily determined;
Third module: for sending D2D signal according to the D2D transmission timing;
Wherein, the UE is in outside MPS process, the MkIncluding at least one of:
Flag bit FK, identify the D2D synchronization signal DKWhether synchronous reference can be used as;
Power threshold PK
Time threshold TK
13. equipment according to claim 12, which is characterized in that if meeting one of the following conditions, the synchronous reference It is the option 2, i.e., the described UE voluntarily determines the D2D transmission timing:
-F1..., FKSynchronous reference cannot be used as by identifying corresponding synchronization signal;
-D1..., DKThe reception power in the UE be respectively smaller than P1..., PK
14. equipment described in 2,13 any one according to claim 1, which is characterized in that the synchronous reference is the option 1, the object synchronization signal is following one:
The flag bit, which is identified as, can be used as connecing in the highest synchronization signal of synchronization level in the synchronization signal of synchronous reference Receive top-quality synchronization signal;
The synchronization level highest for receiving power and being greater than in the synchronization signal of the corresponding power threshold of the synchronization signal received Synchronization signal in the best synchronization signal of the quality of reception;
The smallest D2D synchronization signal of synchronization time difference in the K group D2D synchronization signal, the synchronization time difference are the UE roots The corresponding time threshold is added according to the estimation time difference that the quality of reception of the D2D synchronization signal determines.
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