CN104812052A

CN104812052A - D2D communication synchronization signal transmission method, D2D communication synchronization signal transmission system, sender and receiver

Info

Publication number: CN104812052A
Application number: CN201410036812.1A
Authority: CN
Inventors: 袁明; 夏树强; 吴栓栓; 袁弋非; 杨瑾
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2014-01-24
Filing date: 2014-01-24
Publication date: 2015-07-29
Anticipated expiration: 2034-01-24
Also published as: WO2015109433A1; CN104812052B

Abstract

The invention discloses a D2D communication synchronization signal transmission method, a D2D communication synchronization signal transmission system, a sender and a receiver. The system comprises a sender and a receiver. The sender consists of a configuration module and a sending module. The receiver consists of a configuration module and a receiving module. The configuration modules are used for interacting with a network side to acquire time-frequency resources preconfigured by the network side and determining the frequency domain position of each group of synchronization resources in a sub frame based on a D2D synchronization signal D2DSS on the group of synchronization resources, wherein the preconfigured time-frequency resources refer to n groups of reserved synchronization resources used for bearing synchronization signals on a device-to-device D2D transmission bandwidth, and n is a positive integer. The sending module is used for sending the D2DSSs on the time-frequency resources preconfigured by the network side. The receiving module is used for receiving the D2DSSs on the time-frequency resources preconfigured by the network side. The problem of device-to-device synchronization in various beyond-coverage scenarios is solved.

Description

The transmission method of D2D communication synchronization signal and system, transmitting terminal and receiving terminal

Technical field

The present invention relates to wireless communication field, particularly relate to transmission method and system, transmitting terminal and the receiving terminal of a kind of device-to-device (Device-to-Device is called for short D2D) communication synchronization signal.

Background technology

Cellular communication system is multiplexing due to what achieve limited spectrum resources, thus it is flourish that wireless communication technology is obtained.In the cellular system, as two subscriber equipment (User Equipment, referred to as UE) between when having service needed to transmit, subscriber equipment 1(UE1) to subscriber equipment 2(UE2) business datum, can first by air interface transmission to base station 1, base station 1 by core net by this user data transmission to base station 2, base station 2 again by above-mentioned business datum by air interface transmission to UE2.The business data transmission of UE2 to UE1 adopts similar handling process.As shown in Figure 1, when UE1 and UE2 is positioned at same cellular cell, although so base station 1 and base station 2 are same websites, but a data transfer still can consume two parts of radio spectrum resources.

As can be seen here, if subscriber equipment 1 and subscriber equipment 2 are positioned at same community and at a distance of comparatively near, so above-mentioned cellular communication method is not obviously optimum communication mode.Such as, and in fact, along with the variation of mobile communication business, the application in a wireless communication system such as social networks, E-Payment is more and more extensive, the business closely between user is made to transmit demand growing.Therefore, the communication pattern of device-to-device (Device-to-Device, referred to as D2D) is subject to extensive concern day by day.So-called D2D, as shown in Figure 2, refers to that business datum forwards without base station, but directly by source user equipment by air interface transmission to target UE.This communication pattern is different from the communication pattern of conventional cellular systems.For the user of short-range communication, D2D not only saves radio spectrum resources, and reduces the transfer of data pressure of core net.D2D communication based on Cellular Networks is a kind of under the control of system, the new technique communicated directly is carried out between the terminal equipment of multiple support D2D function, it can reduce system resource and take, increase frequency spectrum efficiency of cellular communication system, reduce terminal transmission power consumption, and save network operation cost to a great extent.

In D2D communication, the receiving terminal of D2D business datum may be single UE, also may be multiple UE, namely also D2D communication may be clean culture (Unicast) communication, also may be broadcast communication (Broadcast) or multicast (Groupcast or Group Communication) or multicast (Multicast) communication.In the consideration of D2D communication plan, the support for above-mentioned communication pattern all needs to consider.

Long Term Evolution (Long Term Evolution, referred to as LTE) system, senior Long Term Evolution (LTE-Advanced, referred to as LTE-A) system and IMT-Advanced (InternationalMobile Telecommunication Advanced, referred to as IMT-Advanced) system is all with OFDM (Orthogonal Frequency Division Multiplexing, referred to as OFDM) based on technology, ofdm system is the data mode of time-frequency bidimensional.The radio frames (frame) of a 10ms is made up of 10 subframes, and 1 subframe (subframe) is made up of 2 continuous slots (slot), and namely subframe i comprises time slot 2i and 2i+1.Normal cyclic prefix (Normal Cyclic Prefix, referred to as NormalCP) time, 1 descending sub frame is made up of 14 OFDM symbol, 1 sub-frame of uplink by 14 SC-FDMA(single carrier-Frequency Division Multiple Access, Single Carrier-Frequency Division multiple access) symbol composition; Expansion CP(Extended CP) time, 1 descending sub frame is made up of 12 OFDM symbol, and 1 sub-frame of uplink is by 12 SC-FDMA symbols.

Wherein, a Resource Block (Resource Block, referred to as RB) is by 12 subcarriers of continuous print on frequency domain, and all OFDM/SC-FDMA symbol compositions in time domain in continuous 1 time slot; Resource Block to (Resource Block pair, referred to as RB pair) by 12 subcarriers of continuous print on frequency domain, and all OFDM/SC-FDMA symbols compositions in time domain in continuous 1 subframe.On each OFDM/SC-FDMA symbol, the resource of a corresponding subcarrier is called Resource Unit (ResourceElement, referred to as RE).

In LTE/LTE-A cellular communication, Cell searching is step very crucial in mobile communication, is the prerequisite that communication link is set up in terminal and base station.No matter be that terminal initially powers in the serving cells, or carry out cell merge in communication process, all need to be connected by cell search process and base station.Cell search process is mainly in order to make terminal and community, place obtain time synchronized and Frequency Synchronization and obtain physical district ID, system bandwidth and other cell broadcast information.Usual terminal, by synchronizing signal, first obtains time synchronized, Frequency Synchronization, then obtains the relevant information of current residing community, as bandwidth, community ID, frame clock information, antenna in cell configuration, CP length etc.

In D2D communication, the primary prerequisite that source user equipment and target UE carry out transfer of data is the Time and Frequency Synchronization realizing transmitting-receiving two-end, a synchronizing process is roughly only had at present about the relevant design that D2D is synchronous, i.e. device-to-device synchronizing signal (the D2DSynchronization Signal that launches according to D2D transmitting terminal of D2D receiving terminal, be called for short D2DSS) obtain with the Time and Frequency Synchronization of transmitting terminal after, to receive further from D2D transmitting terminal launch physical equipment to device synchronization channel (Physical D2DSynchronization Channel, be called for short PD2DSCH), thus obtain D2D transmitting terminal system message specifically and the control information relevant with subsequent data reception.But, also realize details without any concrete, how to transmit comprising D2DSS and PD2DSCH, the association etc. between D2DSS and PD2DSCH.Because D2D communication adopts ascending resource (i.e. the upstream band of FDD or the sub-frame of uplink of TDD) to transmit, the synchronizing process therefore between D2D UE and the design of synchronous signaling all with synchronously have very large difference in LTE/LTE-A system.

Summary of the invention

The technical issues that need to address of the present invention are to provide a kind of transmission method and system, transmitting terminal and receiving terminal of D2D communication synchronization signal, (comprise in covering, cover outer and half mulching scene) stationary problem between device-to-device under solving various covering scene.

In order to solve the problems of the technologies described above, the invention provides a kind of transmission method of synchronizing signal of device-to-device, comprising:

Device-to-device D2D transmitting terminal sends D2D synchronizing signal D2DSS on the pre-configured running time-frequency resource of network side; Wherein, described pre-configured running time-frequency resource refers to that the n group reserved on D2D transmission bandwidth is for carrying the isochronous resources of synchronizing signal, and utilize and be arranged in the often D2DSS organized on isochronous resources and determine the frequency domain position of this group isochronous resources in subframe, wherein n is positive integer.

Further, described D2DSS comprises: D2D master sync signal PD2DSS and/or D2D auxiliary synchronous signals SD2DSS;

Described n group, for carrying the isochronous resources of synchronizing signal, comprising:

On frequency domain, respectively by individual data block RB composition, i=1,2 ..., n;

In time domain, described PD2DSS takies p SC-FDMA symbol, and described SD2DSS takies q SC-FDMA symbol, p and q is the positive integer being more than or equal to 1, represent RB number shared by i-th isochronous resources, for being less than or equal to the positive integer of 6.

Further, described utilization is arranged in the often D2DSS organized on isochronous resources and determines that this group isochronous resources is at the frequency domain position of subframe, comprising:

Be arranged in and often organize the time-domain position of PD2DSS and SD2DSS on isochronous resources in subframe uniquely corresponding to the frequency domain position of described isochronous resources in subframe, the frequency domain position that different time-domain positions is corresponding different.

Further, described method also comprises: when sending described D2DSS, described PD2DSS and described SD2DSS carries root sequence;

Described utilization is arranged in the often D2DSS organized on isochronous resources and determines that this group isochronous resources is at the frequency domain position of subframe, comprising:

Be arranged in the root sequence often organizing PD2DSS and SD2DSS on isochronous resources and uniquely correspond to the frequency domain position of described isochronous resources in subframe, the frequency domain position that different root sequence pair should be different.

Further, described n group, for carrying the frequency domain position of isochronous resources in subframe of synchronizing signal, comprising:

In subframe, described n group for carry synchronizing signal isochronous resources on frequency domain respectively with centered by both sides symmetries on individual Resource Unit RE, wherein, i=1,2 ..., n, resource Block RB sum shared by the transmission bandwidth of D2D, for the total number of sub-carriers comprised in each RB.

As n=1, only have 1 group of isochronous resources, on the frequency domain position of described isochronous resources in subframe in the following one: at D2D transmission bandwidth center be original position on individual RB, with the upper band edge of D2D transmission bandwidth be original position on individual RB with the lower band edge of D2D transmission bandwidth on individual RB, wherein, i=1;

As n=2, there are 2 groups of isochronous resources, on the frequency domain position of described isochronous resources in subframe in the following any two: at D2D transmission bandwidth center be original position on individual RB, with the upper band edge of D2D transmission bandwidth be original position on individual RB with the lower band edge of D2D transmission bandwidth on individual RB, wherein, i=1,2;

As n=3, have 3 groups of isochronous resources, the frequency domain position of described isochronous resources in subframe is respectively at D2D transmission bandwidth center be original position with up/down two band edges of D2D transmission bandwidth on individual RB, wherein, i=1,2,3.

Further, as p=q=1, described PD2DSS and the time-domain position of described SD2DSS in subframe, specifically comprise:

On last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS is positioned on the SC-FDMA symbol after described PD2DSS, and the SC-FDMA symbol being spaced apart any number in 0 ~ 5 between the two; Or,

On last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS is positioned on the SC-FDMA symbol before described PD2DSS, and the SC-FDMA symbol being spaced apart any number in 1 ~ 4 between the two; Or,

On last SC-FDMA symbol of SD2DSS half time slot before subframe, PD2DSS is positioned on the SC-FDMA symbol before described SD2DSS, and the SC-FDMA symbol being spaced apart any number in 0 ~ 4 between the two; Or,

On last SC-FDMA symbol of SD2DSS half time slot before subframe, PD2DSS is positioned on the SC-FDMA symbol after described SD2DSS, and between the two be spaced apart 0,1,3,4 or 5 SC-FDMA symbol; Or,

Character position shared by PD2DSS and SD2DSS be D2DSS in LTE time-domain position basis on unified on the SC-FDMA symbol of any number symbol in left 1 ~ 4; Or,

Character position shared by PD2DSS and SD2DSS be D2DSS in LTE time-domain position basis on unified on the SC-FDMA symbol of any number symbol in right translation 2 ~ 6.

Further, before the described D2DSS of transmission, described method also comprises:

Described D2D transmitting terminal and D2D receiving terminal are consulted about to fix on and the pre-configured running time-frequency resource in consolidated network side are sent and receives described D2DSS.

Further, described D2D transmitting terminal sends D2DSS on the pre-configured running time-frequency resource of network side, comprising:

Under the outer scene of covering, described D2D transmitting terminal monitors described n group for carrying the isochronous resources of synchronizing signal, if available free isochronous resources, an idle isochronous resources is then selected to send described D2DSS on the pre-configured running time-frequency resource of described network side, if there is no idle isochronous resources, then wait for that subsequent time is monitored again;

Or, in covering/half mulching scene under, the isochronous resources that described D2D transmitting terminal adopts network side to indicate sends described D2DSS on the pre-configured running time-frequency resource of described network side.

In order to solve the problems of the technologies described above, present invention also offers a kind of transmission method of synchronizing signal of device-to-device, comprising:

Device-to-device D2D receiving terminal receives D2D synchronizing signal D2DSS on the pre-configured running time-frequency resource of network side; Wherein, described pre-configured running time-frequency resource refers to that the n group reserved on D2D transmission bandwidth is for carrying the isochronous resources of synchronizing signal, and utilize and be arranged in the often D2DSS organized on isochronous resources and determine the frequency domain position of this group isochronous resources in subframe, wherein n is positive integer.

Further, described D2DSS comprises: D2D master sync signal PD2DSS and D2D auxiliary synchronous signals SD2DSS;

On frequency domain, respectively by individual RB composition, i=1,2 ..., n;

Further, described PD2DS and described SD2DSS carries root sequence;

Be arranged in the root sequence often organizing PD2DSS and/or SD2DSS on isochronous resources and uniquely correspond to the frequency domain position of described isochronous resources in subframe, the frequency domain position that different root sequence pair should be different.

Further, before the described D2DSS of reception, described method also comprises:

Described D2D receiving terminal and D2D transmitting terminal are consulted about to fix on and the pre-configured running time-frequency resource in consolidated network side are received and sends described D2DSS.

Further, described D2D receiving terminal receives D2DSS on the pre-configured running time-frequency resource of network side, comprising:

Described D2D receiving terminal carries out the scanning of full frequency band in the scope of D2D transmission band, obtains the PD2DSS on n group isochronous resources;

For often organizing isochronous resources, SD2DSS is searched for forward or backward in the basis of PD2DSS place time-domain position, and determine according to the time-domain position of PD2DSS and SD2DSS in subframe the frequency domain position that described isochronous resources is corresponding in subframe.

Described D2D receiving terminal carries out the scanning of full frequency band in the scope of D2D transmission band, and obtain the PD2DSS on n group isochronous resources, described PD2DSS carries root sequence;

For often organizing isochronous resources, receiving and carrying the SD2DSS of root sequence, and the root sequence that the root sequence of carrying according to described PD2DSS and/or described SD2DSS carry determines that described isochronous resources is at frequency domain position corresponding in subframe.

In order to solve the problems of the technologies described above, present invention also offers a kind of transmitting terminal of synchronizing signal of device-to-device, comprising:

Configuration module, for by mutual with network side, obtain the running time-frequency resource that network side is pre-configured, described pre-configured running time-frequency resource refers to that the n group reserved on device-to-device D2D transmission bandwidth is for carrying the isochronous resources of synchronizing signal, and utilize and be arranged in the often D2D synchronizing signal D2DSS organized on isochronous resources and determine the frequency domain position of this group isochronous resources in subframe, wherein n is positive integer;

Sending module, for sending described D2DSS on the pre-configured running time-frequency resource of described network side.

Be arranged in the root sequence often organizing PD2DSS and SD2DSS on isochronous resources and uniquely correspond to the frequency domain position of described isochronous resources in subframe, the frequency domain position that different root sequence pair should be different;

Described sending module, also for when sending described D2DSS, described PD2DSS and described SD2DSS carries root sequence.

Further, described configuration module, also for before the described D2DSS of transmission, consults about to fix on D2D receiving terminal and the pre-configured running time-frequency resource in consolidated network side sends and receives described D2DSS.

Further, described transmitting terminal also comprises:

Resource selection module, for without under covering scene, monitor described n group for carrying the isochronous resources of synchronizing signal, if available free isochronous resources, described sending module sends described D2DSS on the pre-configured running time-frequency resource of described network side then to select an idle isochronous resources to notify, if there is no idle isochronous resources, then wait for that subsequent time is monitored again;

Or, in covering/half mulching scene under, the isochronous resources that described D2D transmitting terminal adopts network side to indicate notifies that described sending module sends described D2DSS on the pre-configured running time-frequency resource of described network side.

In order to solve the problems of the technologies described above, present invention also offers a kind of receiving terminal of synchronizing signal of device-to-device, comprising:

Receiver module, for receiving described D2DSS on the pre-configured running time-frequency resource of described network side.

On frequency domain, respectively by individual RB composition, i=1,2 ..., n;

Be arranged in the root sequence often organizing PD2DSS and/or SD2DSS on isochronous resources and uniquely correspond to the frequency domain position of described isochronous resources in subframe, the frequency domain position that different root sequence pair should be different;

Described receiver module, also for when receiving described D2DSS, described PD2DS and described SD2DSS carries root sequence.

Further, described configuration module, also for before the described D2DSS of reception, consults about to fix on D2D transmitting terminal and the pre-configured running time-frequency resource in consolidated network side receives and sends described D2DSS.

Further, described receiver module, for receiving D2DSS on the pre-configured running time-frequency resource of described network side, comprising:

In the scope of D2D transmission band, carry out the scanning of full frequency band, obtain the PD2DSS on n group isochronous resources;

In the scope of D2D transmission band, carry out the scanning of full frequency band, obtain the PD2DSS on n group isochronous resources, described PD2DSS carries root sequence;

In order to solve the problems of the technologies described above, present invention also offers a kind of transmission system of synchronizing signal of device-to-device, comprising: transmitting terminal as above and receiving terminal as above.

Compared with prior art, the transmission method of D2D communication synchronization signal provided by the invention and system, transmitting terminal and receiving terminal, (comprise in covering, cover outer and half mulching scene) stationary problem between device-to-device under mainly solving various covering scene.

Accompanying drawing explanation

Fig. 1 is cellular communication schematic diagram when UE is positioned at same base station cell in prior art;

Fig. 2 is a kind of preferred D2D communication system schematic diagram in prior art;

When Fig. 3 a ~ f is preferred p=q=1 in embodiment, PD2DSS and state the time-domain position schematic diagram of SD2DSS in subframe;

When Fig. 4 a is p=q=2 in embodiment, PD2DSS and state the time-domain position schematic diagram of SD2DSS in subframe;

When Fig. 4 b is p=1, q=2 in embodiment, PD2DSS and state the time-domain position schematic diagram of SD2DSS in subframe;

Fig. 5 is the detailed process flow chart that in embodiment, D2D transmitting terminal sends D2DSS on the pre-configured running time-frequency resource of network side;

Fig. 6 is the detailed process flow chart that in embodiment, D2D receiving terminal receives D2DSS on the pre-configured running time-frequency resource of network side;

Fig. 7 is the detailed process flow chart that in embodiment, D2D receiving terminal receives D2DSS on the pre-configured running time-frequency resource of network side;

Fig. 8 is the structure chart of the transmission system of device-to-device communication synchronization signal in embodiment;

When Fig. 9 is the pre-configured 1 group of isochronous resources of system in application example 1, the corresponding relation schematic diagram of the time-domain position of the frequency domain position of this group isochronous resources in subframe and PD2DSS and SD2DSS;

When Figure 10 is the pre-configured 2 groups of isochronous resources of system in application example 2, the corresponding relation schematic diagram of the time-domain position of the frequency domain position of a kind of 2 groups of isochronous resources in subframe and PD2DSS and SD2DSS;

When Figure 11 is the pre-configured 2 groups of isochronous resources of system in application example 3, the corresponding relation schematic diagram of the time-domain position of the frequency domain position of another kind of 2 groups of isochronous resources in subframe and PD2DSS and SD2DSS;

When Figure 12 is the pre-configured 3 groups of isochronous resources of system in application example 4, the corresponding relation schematic diagram of the time-domain position of the frequency domain position of a kind of 3 groups of isochronous resources in subframe and PD2DSS and SD2DSS;

When Figure 13 is the pre-configured 3 groups of isochronous resources of system in application example 5, the corresponding relation schematic diagram of the time-domain position of the frequency domain position of another kind of 3 groups of isochronous resources in subframe and PD2DSS and SD2DSS;

When Figure 14 is the pre-configured 1 group of isochronous resources of system in application example 6, the corresponding relation schematic diagram of the root sequence of the frequency domain position of this group isochronous resources in subframe and PD2DSS and SD2DSS;

Figure 15 is the structure chart of D2D subframe when competitive mode D2D communicates in application example 7;

Figure 16 is the schematic diagram of all reserved isochronous resources of each broadcasting service channel in application example 7.

Embodiment

For making the object, technical solutions and advantages of the present invention clearly understand, hereinafter will be described in detail to embodiments of the invention by reference to the accompanying drawings.It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combination in any mutually.

Embodiment:

Present embodiments provide a kind of transmission method of device-to-device communication synchronization signal, be applied to D2D transmitting terminal, comprise:

D2D transmitting terminal sends D2D synchronizing signal D2DSS on the pre-configured running time-frequency resource of network side; Wherein, described pre-configured running time-frequency resource refers to that the n group reserved on D2D transmission bandwidth is for carrying the isochronous resources of synchronizing signal, and utilize and be arranged in the often D2DSS organized on isochronous resources and determine the frequency domain position of this group isochronous resources in subframe, wherein n is positive integer.

Wherein, before the described D2DSS of transmission, described method also comprises:

Wherein, described D2DSS comprises: D2D master sync signal (Primary D2D SynchronizationSignal is called for short PD2DSS) and/or D2D auxiliary synchronous signals (Secondary D2D SynchronizationSignal is called for short SD2DSS);

Wherein, described n group, for carrying the composition of the isochronous resources of synchronizing signal, comprising:

On frequency domain, respectively by individual RB composition, i=1,2 ..., n;

In time domain, PD2DSS takies p SC-FDMA symbol, and SD2DSS takies q SC-FDMA symbol, p and q is the positive integer being more than or equal to 1, represent RB number shared by i-th isochronous resources, for being less than or equal to the positive integer of 6.Wherein, the value of p and q is by network side fixed configurations in advance.

Wherein, PD2DSS and SD2DSS all sends with the form of sequence, and on each group isochronous resources, the sequence of PD2DSS and SD2DSS adds that the total length (the total number of shared RE) at protection interval equals i=1,2 ..., n.

Wherein, as the preferred mode of one, described n group, for carrying the frequency domain position of isochronous resources in subframe of synchronizing signal, comprising:

In subframe, described n group for carry synchronizing signal isochronous resources on frequency domain respectively with centered by both sides symmetries on individual Resource Unit RE, wherein, i=1,2 ..., n, resource Block RB sum shared by the transmission bandwidth of D2D, for the total number of sub-carriers comprised in each RB,

Or as the preferred mode of another kind, described n group, for carrying the frequency domain position of isochronous resources in subframe of synchronizing signal, comprising:

As n=1, only have 1 group of isochronous resources, on its frequency domain position in subframe in the following one: at D2D transmission bandwidth center be original position on individual RB, with the upper band edge of D2D transmission bandwidth be original position on individual RB with the lower band edge of D2D transmission bandwidth on individual RB, wherein, i=1; Preferably, can at D2D transmission bandwidth center on individual RB;

As n=2, there are 2 groups of isochronous resources, on its frequency domain position in subframe in the following any two: at D2D transmission bandwidth center be original position on individual RB, with the upper band edge of D2D transmission bandwidth be original position on individual RB with the lower band edge of D2D transmission bandwidth on individual RB, wherein, i=1,2; Preferably, can be original position with up/down two band edges of D2D transmission bandwidth respectively on individual RB;

As n=3, have 3 groups of isochronous resources, its frequency domain position in subframe is respectively at D2D transmission bandwidth center be original position with up/down two band edges of D2D transmission bandwidth on individual RB, wherein, i=1,2,3.

Wherein, as the preferred mode of one, during preferred p=q=1, as shown in Figure 3, described PD2DSS and the time-domain position of described SD2DSS in subframe, specifically comprise:

1) as shown in Figure 3 a, on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS is positioned on the SC-FDMA symbol after described PD2DSS, and the SC-FDMA symbol being spaced apart any number in 0 ~ 5 between the two, provide the possibility of 6 kinds of time-domain positions; Or,

2) as shown in Figure 3 b, on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS is positioned on the SC-FDMA symbol before described PD2DSS, and the SC-FDMA symbol being spaced apart any number in 1 ~ 4 between the two, provide the possibility of 4 kinds of time-domain positions; Or,

3) as shown in Figure 3 c, on last SC-FDMA symbol of SD2DSS half time slot before subframe, PD2DSS is positioned on the SC-FDMA symbol before described SD2DSS, and the SC-FDMA symbol being spaced apart any number in 0 ~ 4 between the two, provide the possibility of 5 kinds of time-domain positions; Or,

4) as shown in Figure 3 d, on last SC-FDMA symbol of SD2DSS half time slot before subframe, PD2DSS is positioned on the SC-FDMA symbol after described SD2DSS, and between the two be spaced apart 0,1,3,4 or 5 SC-FDMA symbol, provide the possibility of 5 kinds of time-domain positions; Or,

5) as shown in Figure 3 e, character position shared by PD2DSS and SD2DSS be D2DSS in LTE time-domain position basis on unified on the SC-FDMA symbol of any number symbol in left 1 ~ 4, provide the possibility of 4 kinds of time-domain positions; Or,

6) as illustrated in figure 3f, character position shared by PD2DSS and SD2DSS be D2DSS in LTE time-domain position basis on unified on the SC-FDMA symbol of any number symbol in right translation 2 ~ 6, provide the possibility of 5 kinds of time-domain positions.

And for example, during p=q=2, as shown in fig. 4 a, provide a kind of described PD2DSS and the time-domain position of described SD2DSS in subframe, be specially: PD2DSS and SD2DSS respectively accounts for 2 SC-FDMA symbols, PD2DSS is positioned at 1-2 the symbol of slot1, and SD2DSS is positioned at 1-2 reciprocal the symbol of slot0;

Work as p=1, during q=2, as shown in Figure 4 b, provide a kind of described PD2DSS and the time-domain position of described SD2DSS in subframe, be specially: PD2DSS accounts for 1 SC-FDMA symbol, SD2DSS, account for 2 SC-FDMA symbols, PD2DSS is positioned at last 1 symbol of slot0, and SD2DSS is positioned at 1-2 the symbol of slot1.

As the preferred mode of one, described utilization is arranged in the often D2DSS organized on isochronous resources and determines that this group isochronous resources is at the frequency domain position of subframe, comprising:

Wherein, the corresponding relation of the time-domain position of PD2DSS and SD2DSS in subframe and the frequency domain position of described isochronous resources in subframe is pre-configured by network side, that is, the pre-configured running time-frequency resource of network has contained the corresponding relation of the time-domain position of PD2DSS and SD2DSS and the frequency domain position of isochronous resources, network side provides multiple corresponding relation, different time-domain positions indicates different frequency domain positions, as long as namely time-domain position uniquely can indicate frequency domain position.

Relative time-frequency location due to different PD2DSS with SD2DSS represents different pre-configured running time-frequency resources, so, D2D transmitting terminal and D2D receiving terminal need to appoint the running time-frequency resource selecting identical network side pre-configured in advance, that is, select identical time-domain position and the corresponding relation of frequency domain position.

As the preferred mode of another kind, described PD2DS and described SD2DSS carries root sequence; Described utilization is arranged in the often D2DSS organized on isochronous resources and determines that this group isochronous resources is at the frequency domain position of subframe, comprising:

Do not need in this mode to consider the time-domain position of PD2DSS and SD2DSS and the corresponding relation of the frequency domain position of isochronous resources in subframe, so, the time-domain position of PD2DSS and SD2DSS of isochronous resources can be fixing, such as, the time-domain position of PD2DSS with SD2DSS of n group isochronous resources is identical, such as be, on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS be positioned at PD2DSS after SC-FDMA symbol on.

Wherein, the root sequence of PD2DSS and/or SD2DSS and the corresponding relation of the frequency domain position of described isochronous resources in subframe pre-configured by network side, that is, the corresponding relation of the root sequence of PD2DSS and/or SD2DSS and the frequency domain position of isochronous resources has been contained in the running time-frequency resource that network side is pre-configured.But, the different root sequences of carrying due to PD2DSS and SD2DSS represent different pre-configured running time-frequency resources, so D2D transmitting terminal and D2D receiving terminal need to appoint the running time-frequency resource selecting identical network side pre-configured in advance, that is, identical root sequence and the corresponding relation of frequency domain position is selected.

As the preferred mode of one, as shown in Figure 5, under the outer scene of covering, the detailed process that described D2D transmitting terminal sends D2DSS on the pre-configured running time-frequency resource of network side comprises:

S101: described D2D transmitting terminal monitors described n group for carrying the isochronous resources of synchronizing signal;

S102: judge whether available free isochronous resources, if had, then performs step S103, otherwise performs step S104;

S103: if available free isochronous resources, then select an idle isochronous resources to send described D2DSS on the pre-configured running time-frequency resource of network side;

S104: if do not have idle isochronous resources, then wait for that subsequent time is monitored again, and select whether send synchronizing signal according to snoop results.

In addition, in covering/half mulching scene under, as the preferred mode of one, the isochronous resources that described D2D transmitting terminal indicates according to base station sends described D2DSS on the pre-configured running time-frequency resource of network side.

Wherein, the running time-frequency resource that network side is pre-configured is the one in following 2 kinds of modes:

1) be arranged in and often organize the time-domain position of PD2DSS and SD2DSS on isochronous resources in subframe uniquely corresponding to the frequency domain position of described isochronous resources in subframe, the frequency domain position that different time-domain positions is corresponding different;

Wherein, frequency domain position and time-domain position specifically can adopt the one as described above, as long as time-domain position uniquely can indicate frequency domain position; When sending PD2DSS and SD2DSS, this frequency domain position and time-domain position send.

2) be arranged in the root sequence often organizing PD2DSS and SD2DSS on isochronous resources and uniquely correspond to the frequency domain position of described isochronous resources in subframe, the frequency domain position that different root sequence pair should be different.

Wherein, when sending PD2DSS and SD2DSS, described PD2DSS and SD2DSS carries root sequence, when sending PD2DSS and SD2DSS, the frequency domain position that this root sequence pair is answered sends.Time-domain position can be the optional position in subframe, pre-configured by network side.

The present embodiment additionally provides a kind of transmission method of device-to-device communication synchronization signal, is applied to D2D receiving terminal, comprises:

D2D receiving terminal receives D2D synchronizing signal D2DSS on the pre-configured running time-frequency resource of network side; Wherein, described pre-configured running time-frequency resource refers to that the n group reserved on D2D transmission bandwidth is for carrying the isochronous resources of synchronizing signal, and utilize and be arranged in the often D2DSS organized on isochronous resources and determine the frequency domain position of this group isochronous resources in subframe, wherein n is positive integer.

Wherein, before the described D2DSS of reception, described method also comprises:

Wherein, described D2DSS comprises: PD2DSS and SD2DSS;

On frequency domain, respectively by individual RB composition, i=1,2 ..., n;

In time domain, PD2DSS takies p SC-FDMA symbol, and SD2DSS takies q SC-FDMA symbol, p and q is the positive integer being more than or equal to 1, represent RB number shared by i-th isochronous resources, for being less than or equal to the positive integer of 6.

Wherein, the value of p and q is by network side fixed configurations in advance.

Or, in another kind of optimal way, receive PD2DS and SD2DSS carrying root sequence;

But, the different root sequences of carrying due to PD2DSS and SD2DSS represent different pre-configured running time-frequency resources, so D2D transmitting terminal and D2D receiving terminal need to appoint the running time-frequency resource selecting identical network side pre-configured in advance, that is, identical root sequence and the corresponding relation of frequency domain position is selected.

As the preferred mode of one, D2D receiving terminal has appointed the time-domain position of PD2DSS and SD2DSS in subframe and the corresponding relation of the frequency domain position of isochronous resources in subframe with transmitting terminal, namely have selected the running time-frequency resource that the network side identical with transmitting terminal is pre-configured, as shown in Figure 6, the detailed process that D2D receiving terminal receives D2DSS on the pre-configured running time-frequency resource of network side comprises:

S201: described D2D receiving terminal carries out the scanning of full frequency band in the scope of D2D transmission band, obtains the PD2DSS on n group isochronous resources, obtains slot synchronization according to the PD2DSS received;

S202: for often organizing isochronous resources, SD2DSS is searched for forward or backward in the basis of PD2DSS place time-domain position, and determines according to the time-domain position of PD2DSS and SD2DSS in subframe the frequency domain position that described isochronous resources is corresponding in subframe;

S203:D2D receiving terminal realizes according to PD2DSS and SD2DSS that receive and the time synchronized of D2D transmitting terminal and Frequency Synchronization, and/or the id information of acquisition D2D transmitting terminal.

As the preferred mode of one, D2D receiving terminal has appointed the root sequence of PD2DSS and/or SD2DSS and the corresponding relation of the frequency domain position of isochronous resources in subframe with transmitting terminal, namely have selected the running time-frequency resource that the network side identical with transmitting terminal is pre-configured, as shown in Figure 7, the detailed process that D2D receiving terminal receives D2DSS on the pre-configured running time-frequency resource of network side comprises:

S301: described D2D receiving terminal carries out the scanning of full frequency band in the scope of D2D transmission band, obtain the PD2DSS on n group isochronous resources, obtain slot synchronization according to the PD2DSS received, described PD2DSS carries root sequence;

S302: for often organizing isochronous resources, receives and carries the SD2DSS of root sequence, and the root sequence that the root sequence of carrying according to described PD2DSS and/or described SD2DSS carry determines the frequency domain position that described isochronous resources is corresponding in subframe;

S303:D2D receiving terminal realizes according to PD2DSS and SD2DSS that receive and the time synchronized of D2D transmitting terminal and Frequency Synchronization, and/or the id information of acquisition D2D transmitting terminal.

As shown in Figure 8, the present embodiment additionally provides a kind of transmission system of device-to-device communication synchronization signal, comprising: the receiving terminal that the transmitting terminal that D2D communicates communicates with D2D, wherein:

Transmitting terminal, comprising:

Configuration module, for by mutual with network side, obtain the running time-frequency resource that network side is pre-configured, described pre-configured running time-frequency resource refers to that the n group reserved on D2D transmission bandwidth is for carrying the isochronous resources of synchronizing signal, and utilize and be arranged in the often D2DSS organized on isochronous resources and determine the frequency domain position of this group isochronous resources in subframe, wherein n is positive integer;

Sending module, for sending D2D synchronizing signal D2DSS on the pre-configured running time-frequency resource of described network side.

Wherein, configuration module, determined the time-domain position and frequency domain position of often organizing isochronous resources, the running time-frequency resource that namely network side is pre-configured, transmitter module just sends D2DSS on this running time-frequency resource.

Wherein, described D2DSS comprises: D2D master sync signal PD2DSS and/or D2D auxiliary synchronous signals SD2DSS;

As the preferred mode of another kind, described utilization is arranged in the often D2DSS organized on isochronous resources and determines that this group isochronous resources is at the frequency domain position of subframe, comprising:

Wherein, as preferred p=q=1, as shown in Fig. 3 a ~ 3b, described PD2DSS and the time-domain position of described SD2DSS in subframe.

In addition, described configuration module, also for before the described D2DSS of transmission, consults about to fix on D2D receiving terminal and the pre-configured running time-frequency resource in consolidated network side sends and receives described D2DSS.

In addition, described transmitting terminal also comprises:

Receiving terminal, comprising:

Receiver module, for receiving D2D synchronizing signal D2DSS on the pre-configured running time-frequency resource of described network side.

Described D2DSS comprises: D2D master sync signal PD2DSS and D2D auxiliary synchronous signals SD2DSS;

On frequency domain, respectively by individual RB composition, i=1,2 ..., n;

In addition, described configuration module, also for before the described D2DSS of reception, consults about to fix on D2D transmitting terminal and the pre-configured running time-frequency resource in consolidated network side receives and sends described D2DSS.

Wherein, as the preferred mode of one, described receiver module, for receiving D2DSS on the pre-configured running time-frequency resource of described network side, comprising:

As the preferred mode of another kind, described receiver module, for receiving D2DSS on the pre-configured running time-frequency resource of described network side, comprising:

In application example below, during with p=q=1, PD2DSS and the time-domain position of described SD2DSS in subframe are example, respectively with isochronous resources on frequency domain respectively with centered by both sides symmetries on individual Resource Unit RE, or isochronous resources is at D2D transmission bandwidth center be original position on individual RB, with the upper band edge of D2D transmission bandwidth be original position on individual RB with the lower band edge of D2D transmission bandwidth it individual RB is example, there is relation one to one in the time-domain position often organizing the frequency domain position of isochronous resources in subframe and PD2DSS and SD2DSS, indicate isochronous resources position in a frequency domain by the time-domain position of PD2DSS and SD2DSS, the present embodiment is described in detail.

Application example 1

If only have 1 group of isochronous resources, as shown in Figure 9, the corresponding relation of the time-domain position of the frequency domain position of this group isochronous resources in subframe and PD2DSS and SD2DSS is shown:

When this group isochronous resources is positioned in the middle of D2D transmission band on individual RB, as shown in Fig. 9 (a).Now, PD2DSS and SD2DSS respectively accounts for 1 SC-FDMA symbol, and PD2DSS is positioned at the 3rd symbol of slot1, and SD2DSS is positioned on last symbol of slot0.

When this group isochronous resources is positioned in the middle of non-D2D transmission band, such as, the top edge being positioned at D2D transmission band is original position on individual RB, as shown in Fig. 9 (b), PD2DSS is positioned on the second-to-last SC-FDMA symbol of slot0, SD2DSS be positioned at PD2DSS before 1 SC-FDMA symbol on.

D2D receiving terminal can determine the frequency domain position at synchronizing signal place according to the relative position between PD2DSS and SD2DSS in time domain, by network side fixed configurations in advance.

Application example 2:

The pre-configured 2 groups of isochronous resources of network side lay respectively at the situation of the up/down band edge of D2D transmission bandwidth, as shown in Figure 10, give the corresponding relation of the time-domain position of 2 groups of isochronous resources at frequency domain position and PD2DSS and SD2DSS:

The frequency domain position of the 1st group of isochronous resources is: be original position with the upper band edge of D2D transmission bandwidth on individual RB, now, PD2DSS and SD2DSS respectively accounts for 1 SC-FDMA symbol, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, on 1 SC-FDMA symbol after SD2DSS is positioned at and is close to PD2DSS;

The frequency domain position of the 2nd group of isochronous resources is: be original position with the lower band edge of D2D transmission bandwidth on individual RB, as shown in Figure 10, now, PD2DSS and SD2DSS respectively accounts for 1 SC-FDMA symbol, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS be positioned at PD2DSS before SC-FDMA symbol on, between the two be spaced apart 1 SC-FDMA symbol.

Note, the time-domain position at PD2DSS and SD2DSS place is not limited to these two kinds that provide in this application example, can when p=q=1, the time-domain position 1 of PD2DSS and described SD2DSS in subframe) ~ 6) in the time-frequency location listed optional two kinds, as long as the time-domain position at PD2DSS and SD2DSS place uniquely can indicate the frequency domain position at isochronous resources place.

Wherein, the detailed process of D2D transmitting terminal transmitting synchronizing signal is:

Under covering outer scene, D2D transmitting terminal monitors above-mentioned 2 groups of isochronous resources, if it is idle for finding the 1st group, so D2D transmitting terminal is then original position at the upper band edge of D2D transmission bandwidth individual RB sends PD2DSS and SD2DSS, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, on 1 SC-FDMA symbol after SD2DSS is positioned at and is close to PD2DSS; If it is idle that D2D transmitting terminal finds the 2nd group, so D2D transmitting terminal is then original position at the lower band edge of D2D transmission bandwidth individual RB sends PD2DSS and SD2DSS, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS be positioned at PD2DSS before SC-FDMA symbol on, between the two be spaced apart 1 SC-FDMA symbol.

If under covering interior/half mulching scene, D2D transmitting terminal is at the 1st group or on the 2nd group of isochronous resources, send synchronizing signal unification carries out scheduling acquisition by base station.

Wherein, the detailed process of D2D receiving terminal reception synchronizing signal is:

First, in the scope of D2D transmission band, carry out the scanning of full frequency band, obtain the PD2DSS on above-mentioned 2 groups of isochronous resources, D2D receiving terminal can obtain slot synchronization according to the PD2DSS received;

Then, D2D receiving terminal searches for SD2DSS forward or backward on the basis of PD2DSS, if D2D receiving terminal has searched SD2DSS backward on the basis of PD2DSS, so just can determine what to be positioned at the upper band edge of D2D transmission bandwidth be original position to this synchronizing signal according to the time-domain position at PD2DSS and SD2DSS place on individual RB; If receiving terminal straight line on the basis of PD2DSS has arrived SD2DSS, and between the two be spaced apart 1 SC-FDMA symbol, so just can determine what to be positioned at the lower band edge of D2D transmission bandwidth be original position to this synchronizing signal according to the time-domain position at PD2DSS and SD2DSS place on individual RB.

Finally, D2D receiving terminal just completes and the time synchronized of D2D transmitting terminal and Frequency Synchronization according to PD2DSS and SD2DSS received, and/or obtains the id information of D2D transmitting terminal.

Application example 3:

The situation that the pre-configured 2 groups of isochronous resources of network side distribute at equal intervals on whole D2D transmission bandwidth, as shown in figure 11, gives the corresponding relation of the time-domain position of 2 groups of isochronous resources at frequency domain position and PD2DSS and SD2DSS:

Described 2 groups of isochronous resources on frequency domain respectively with centered by both sides symmetries on individual RE, wherein, i=1,2.Suppose that the total transmission bandwidth of D2D is 50 RB, namely for the total number of sub-carriers comprised in each RB, namely 12, totally 600 RE, then:

The frequency domain position of the 1st group of (i=1) isochronous resources is: the both sides symmetry centered by 200RE on individual RE, wherein, the subcarrier at 200RE place is as direct current carrier (DC carrier wave), it does not carry any data, as shown in figure 11, now, PD2DSS and SD2DSS respectively accounts for 1 SC-FDMA symbol, and on last SC-FDMA symbol of SD2DSS half time slot before subframe, on 1 SC-FDMA symbol before PD2DSS is positioned at and is close to SD2DSS.

The frequency domain position of the 2nd group of (i=2) isochronous resources is: the both sides symmetry centered by 400RE individual RE, wherein, the subcarrier at 400RE place is as direct current carrier (DC carrier wave), it does not carry any data, as shown in figure 11, now, PD2DSS and SD2DSS respectively accounts for 1 SC-FDMA symbol, and on last SC-FDMA symbol of SD2DSS half time slot before subframe, on 1 SC-FDMA symbol after PD2DSS is positioned at and is close to SD2DSS.

Note, the time-domain position at PD2DSS and SD2DSS place is not limited to these two kinds that provide in this application example, can when p=q=1, the time-domain position 1 of PD2DSS and described SD2DSS in subframe) ~ 6) in the time-frequency location listed optional two kinds, as long as the time-domain position at PD2DSS and SD2DSS place uniquely can refer to the frequency domain position at isochronous resources place.

Under covering outer scene, D2D transmitting terminal monitors above-mentioned 2 groups of isochronous resources, if it is idle for finding the 1st group, so D2D transmitting terminal is then in the both sides symmetry centered by 200RE individual RE sends PD2DSS and SD2DSS, and on last SC-FDMA symbol of SD2DSS half time slot before subframe, on 1 SC-FDMA symbol before PD2DSS is positioned at and is close to SD2DSS; If it is idle that D2D transmitting terminal finds the 2nd group, so D2D transmitting terminal is then in the both sides symmetry centered by 400RE individual RE sends PD2DSS and SD2DSS, and on last SC-FDMA symbol of SD2DSS half time slot before subframe, on 1 SC-FDMA symbol after PD2DSS is positioned at and is close to SD2DSS.

Then, D2D receiving terminal searches for SD2DSS forward or backward on the basis of PD2DSS, if D2D receiving terminal has searched SD2DSS backward on the basis of PD2DSS, so just can determine that this synchronizing signal is positioned at both sides symmetry centered by 200RE according to the time-domain position at PD2DSS and SD2DSS place on individual RE; If receiving terminal straight line on the basis of PD2DSS has arrived SD2DSS, so just can determine that this synchronizing signal is positioned at both sides symmetry centered by 400RE according to the time-domain position at PD2DSS and SD2DSS place on individual RE;

Application example 4:

The pre-configured 3 groups of isochronous resources of network side lay respectively at the central authorities of D2D transmission bandwidth and the situation of up/down frequency band, as shown in figure 12, give the corresponding relation of the time-domain position of 3 groups of isochronous resources at frequency domain position and PD2DSS and SD2DSS:

The frequency domain position of the 1st group of isochronous resources is: be original position with the upper band edge of D2D transmission bandwidth on individual RB, now, PD2DSS and SD2DSS respectively accounts for 1 SC-FDMA symbol, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS be positioned at PD2DSS after SC-FDMA symbol on, and between the two be spaced apart 1 SC-FDMA symbol;

The frequency domain position of the 2nd group of isochronous resources is: in the middle of D2D transmission band on individual RB, as shown in figure 12, now, PD2DSS and SD2DSS respectively accounts for 1 SC-FDMA symbol, and its time-domain position adopts the existing scheme of FDD LTE or TDD LTE;

The frequency domain position of the 3rd group of isochronous resources is: be original position with the lower band edge of D2D transmission bandwidth on individual RB, now, PD2DSS and SD2DSS respectively accounts for 1 SC-FDMA symbol, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS be positioned at PD2DSS after SC-FDMA symbol on, and between the two be spaced apart 2 SC-FDMA symbols.

Under covering outer scene, D2D transmitting terminal monitors above-mentioned 3 groups of isochronous resources, if it is idle for finding the 1st group, so D2D transmitting terminal is then original position at the upper band edge of D2D transmission bandwidth individual RB sends PD2DSS and SD2DSS, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS be positioned at PD2DSS after SC-FDMA symbol on, and between the two be spaced apart 1 SC-FDMA symbol; If it is idle that D2D transmitting terminal finds the 2nd group, so in the middle of D2D transmitting terminal D2D transmission band individual RB sends PD2DSS and SD2DSS, and PD2DSS and SD2DSS time-domain position adopts the existing scheme of FDD LTE or TDD LTE; If it is idle that D2D transmitting terminal finds the 3rd group, so D2D transmitting terminal is then original position at the lower band edge of D2D transmission bandwidth individual RB sends PD2DSS and SD2DSS, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS be positioned at PD2DSS after SC-FDMA symbol on, and between the two be spaced apart 2 SC-FDMA symbols.

If under covering interior/half mulching scene, D2D transmitting terminal is at the 1st group, the 2nd group or on the 3rd group of isochronous resources, send synchronizing signal unification carries out scheduling acquisition by base station.

Wherein, the concrete steps of D2D receiving terminal reception synchronizing signal are:

First, in the scope of D2D transmission band, carry out the scanning of full frequency band, obtain the PD2DSS on above-mentioned 3 groups of isochronous resources, D2D receiving terminal can obtain slot synchronization according to the PD2DSS received;

Then, D2D receiving terminal searches for SD2DSS forward or backward on the basis of PD2DSS, if D2D receiving terminal goes forward to have searched SD2DSS on the basis of PD2DSS, so just can determine that this synchronizing signal is positioned in the middle of D2D transmission band according to the time-domain position at PD2DSS and SD2DSS place on individual RB; If D2D receiving terminal has searched SD2DSS backward on the basis of PD2DSS, and between the two be spaced apart 1 SC-FDMA symbol, so just can determine what to be positioned at the upper band edge of D2D transmission bandwidth be original position to this synchronizing signal according to the time-domain position at PD2DSS and SD2DSS place on individual RB; If D2D receiving terminal has searched SD2DSS backward on the basis of PD2DSS, and between the two be spaced apart 2 SC-FDMA symbols, so just can judge that this synchronizing signal is positioned at the lower band edge of D2D transmission bandwidth as original position according to the time-domain position at PD2DSS and SD2DSS place on individual RB.

Application example 5:

The situation that the pre-configured 3 groups of isochronous resources of network side distribute at equal intervals on whole D2D transmission bandwidth, as shown in figure 13, gives the corresponding relation of the time-domain position of 3 groups of isochronous resources at frequency domain position and PD2DSS and SD2DSS:

Described 3 groups of isochronous resources on frequency domain respectively with centered by both sides symmetries on individual RE, wherein, i=1,2,3.Suppose that the total transmission bandwidth of D2D is 100 RB, namely for the total number of sub-carriers comprised in each RB, namely 12, totally 1200 RE, then:

The frequency domain position of the 1st group of isochronous resources is: the both sides symmetry centered by 300RE on individual RE, wherein, the subcarrier at 300RE place is as direct current carrier (DC carrier wave), it does not carry any data, as shown in figure 13, now, PD2DSS and SD2DSS respectively accounts for 1 SC-FDMA symbol, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS be positioned at PD2DSS before SC-FDMA symbol on, and between the two be spaced apart 3 SC-FDMA symbols.

The frequency domain position of the 2nd group of isochronous resources is: the both sides symmetry centered by 600RE on individual RE, wherein, the subcarrier at 600RE place is as direct current carrier (DC carrier wave), it does not carry any data, as shown in figure 13, now, PD2DSS and SD2DSS respectively accounts for 1 SC-FDMA symbol, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, on 1 SC-FDMA symbol after SD2DSS is positioned at and is close to PD2DSS;

The frequency domain position of the 3rd group of isochronous resources is: the both sides symmetry centered by 900RE on individual RE, wherein, the subcarrier at 900RE place is as direct current carrier (DC carrier wave), it does not carry any data, as shown in figure 13, now, PD2DSS and SD2DSS respectively accounts for 1 SC-FDMA symbol, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS be positioned at PD2DSS after SC-FDMA symbol on, and between the two be spaced apart 3 SC-FDMA symbols.

Under covering outer scene, D2D transmitting terminal monitors above-mentioned 3 groups of isochronous resources, if it is idle for finding the 1st group, so D2D transmitting terminal is then in the both sides symmetry centered by 300RE individual RE sends PD2DSS and SD2DSS, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS be positioned at PD2DSS before SC-FDMA symbol on, and between the two be spaced apart 3 SC-FDMA symbols; If it is idle that D2D transmitting terminal finds the 2nd group, so D2D transmitting terminal is then in the both sides symmetry centered by 600RE individual RE sends PD2DSS and SD2DSS, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, on 1 SC-FDMA symbol after SD2DSS is positioned at and is close to PD2DSS; If it is idle that D2D transmitting terminal finds the 3rd group, so D2D transmitting terminal is then in the both sides symmetry centered by 900RE individual RE sends PD2DSS and SD2DSS, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS be positioned at PD2DSS after SC-FDMA symbol on, between the two be spaced apart 3 SC-FDMA symbols.

Then, D2D receiving terminal searches for SD2DSS forward or backward on the basis of PD2DSS, if D2D receiving terminal on the basis of PD2DSS backward 1 SC-FDMA symbol search arrived SD2DSS, so just can determine that this synchronizing signal is positioned at both sides symmetry centered by 600RE according to the time-domain position at PD2DSS and SD2DSS place on individual RE; If receiving terminal straight line on the basis of PD2DSS has arrived SD2DSS, and between the two be spaced apart 3 SC-FDMA symbols, so just can determine that this synchronizing signal is positioned at both sides symmetry centered by 300RE according to the time-domain position at PD2DSS and SD2DSS place on individual RE; If receiving terminal has searched SD2DSS backward on the basis of PD2DSS, and between the two be spaced apart 3 SC-FDMA symbols, so just can determine that this synchronizing signal is positioned at both sides symmetry centered by 900RE according to the time-domain position at PD2DSS and SD2DSS place on individual RE.

Below, during with p=q=1, PD2DSS and the time-domain position of described SD2DSS in subframe are example, respectively with isochronous resources on frequency domain respectively with centered by both sides symmetries on individual Resource Unit RE, or isochronous resources is at D2D transmission bandwidth center be original position on individual RB, with the upper band edge of D2D transmission bandwidth be original position on individual RB with the lower band edge of D2D transmission bandwidth it individual RB is example, there is relation one to one in the root sequence often organizing the frequency domain position of isochronous resources in subframe and PD2DSS and SD2DSS, indicate isochronous resources position in a frequency domain by the root sequence of PD2DSS and/or SD2DSS, the present embodiment is described in detail.

Application example 6:

The pre-configured 3 groups of isochronous resources of network side lay respectively at the central authorities of D2D transmission bandwidth and the situation of up/down frequency band, as shown in figure 14, give 3 groups of isochronous resources at frequency domain position:

PD2DSS carries 3 kinds of different root sequences, with 0, and 1,2 mark.The 0th kind of frequency domain position that root sequence pair is answered is the center that D2DSS is positioned at D2D transmission band; The 1st kind of frequency domain position that root sequence pair is answered is the top edge that D2DSS is positioned at D2D transmission band; The 2nd kind of frequency domain position that root sequence pair is answered is the lower limb that D2DSS is positioned at D2D transmission band; Wherein, the time-domain position of PD2DSS and SD2DSS is any, and by the semi-static configuration of network side.

Or such as, SD2DSS carries 168 kinds of different root sequences, utilizes 0 ~ 167 to mark.When meeting imod3=0, during i=0 ~ 167, corresponding frequency domain position is the center that D2DSS is positioned at D2D transmission band; Met imod3=1 at that time, during i=0 ~ 167, corresponding frequency domain position is the top edge that D2DSS is positioned at D2D transmission band; Met imod3=2 at that time, during i=0 ~ 167, corresponding frequency domain position is the lower limb that D2DSS is positioned at D2D transmission band; Wherein, the time-domain position of PD2DSS and SD2DSS is any, and by the semi-static configuration of network side.

As shown in figure 14, give according to above-mentioned 3 kinds of root sequences, or 168 kinds of different root sequence pair 3(3 group isochronous resources) get film, 3 kinds of corresponding frequency domain positions, but root sequence itself can not show in the drawings.

The frequency domain position of the 1st group of isochronous resources is: be original position with the upper band edge of D2D transmission bandwidth on individual RB, what now send is the 1st kind of root sequence, or meets imod3=1, the sequence of i=0 ~ 167;

The frequency domain position of the 2nd group of isochronous resources is: in the middle of D2D transmission band on individual RB, what now send is the 0th kind of root sequence, or meets imod3=0, the sequence of i=0 ~ 167;

The frequency domain position of the 3rd group of isochronous resources is: be original position with the lower band edge of D2D transmission bandwidth on individual RB, what now send is the 2nd kind of root sequence, or meets imod3=2, the sequence of i=0 ~ 167; .

Application example 7:

For in each Traffic Channel respectively reserved one piece of fixing running time-frequency resource be used for the situation of the transmission of synchronizing signal.

In the D2D communication of competitive mode, the subframe of D2D control and/or transfer of data is had to be called D2D subframe (D2D subframe), each D2D subframe can be divided into multiple traffic channel resource on frequency domain, and each Traffic Channel is made up of N number of RB, and wherein N is positive integer.Each UE monitors and selects an idle Traffic Channel to send corresponding D2D and controls and/or broadcast data.Multiple UE can use the successful Traffic Channel of competition separately to send simultaneously and control and/or broadcast data on a D2D subframe, other UE are in monitoring reception state on D2D subframe, receive the information in one or more Traffic Channel in this D2Dsubframe.When competitive mode D2D communicates, the structure chart of D2D subframe as shown in figure 15.

The frequency domain position of Traffic Channel is that system is just changeless once configuration.If the frequency domain position at PD2DSS and the SD2DSS place in each Traffic Channel and the time-domain position at PD2DSS and SD2DSS place are relations one to one, as long as so ensure that the time-domain position at PD2DSS and the SD2DSS place be positioned on different business channel is different, as shown in figure 16, wherein, optional time-domain position is configured with reference to PD2DSS during p=q=1 and the time-domain position of described SD2DSS in subframe.

Such as, PD2DSS and SD2DSS of Traffic Channel 1 respectively accounts for 1 SC-FDMA symbol, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS be positioned at PD2DSS before SC-FDMA symbol on, and between the two be spaced apart 1 SC-FDMA symbol.PD2DSS and SD2DSS of Traffic Channel 2 respectively accounts for 1 SC-FDMA symbol, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS be positioned at PD2DSS before SC-FDMA symbol on, and between the two be spaced apart 2 SC-FDMA symbols.PD2DSS and SD2DSS of Traffic Channel m respectively accounts for 1 SC-FDMA symbol, and on last SC-FDMA symbol of PD2DSS half time slot before subframe, SD2DSS be positioned at PD2DSS after SC-FDMA symbol on, and between the two be spaced apart 2 SC-FDMA symbols.

If introduce new root sequence for PD2DSS and SD2DSS, the time-domain position at PD2DSS and the SD2DSS place in so each Traffic Channel can be fixing, namely, PD2DSS and SD2DSS can be fixed on identical time-domain position, such as, select a kind of time-domain position just passable when p=q=1 in PD2DSS and the time-domain position of described SD2DSS in subframe, certainly, the time-domain position at PD2DSS and the SD2DSS place of each Traffic Channel also can be different, as long as ensure that the frequency domain position at PD2DSS and SD2DSS place and a unique root sequence keep binding relationship one by one.

As can be seen from above-described embodiment, relative to prior art, the transmission method of the D2D communication synchronization signal provided in above-described embodiment and system, transmitting terminal and receiving terminal, mainly solve the outer scene of covering and divide into standby stationary problem between equipment.

The all or part of step that one of ordinary skill in the art will appreciate that in said method is carried out instruction related hardware by program and is completed, and described program can be stored in computer-readable recording medium, as read-only memory, disk or CD etc.Alternatively, all or part of step of above-described embodiment also can use one or more integrated circuit to realize.Correspondingly, each module/unit in above-described embodiment can adopt the form of hardware to realize, and the form of software function module also can be adopted to realize.The present invention is not restricted to the combination of the hardware and software of any particular form.

The foregoing is only the preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.According to summary of the invention of the present invention; also can there be other various embodiments; when not deviating from the present invention's spirit and essence thereof; those of ordinary skill in the art are when making various corresponding change and distortion according to the present invention; within the spirit and principles in the present invention all; any amendment of doing, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims

1. a transmission method for the synchronizing signal of device-to-device, comprising:

2. the method for claim 1, is characterized in that:

Described D2DSS comprises: D2D master sync signal PD2DSS and/or D2D auxiliary synchronous signals SD2DSS;

3. method as claimed in claim 2, is characterized in that:

4. method as claimed in claim 2, is characterized in that:

Described method also comprises: when sending described D2DSS, described PD2DSS and described SD2DSS carries root sequence;

5. the method as described in claim 3 or 4, is characterized in that:

Described n group, for carrying the frequency domain position of isochronous resources in subframe of synchronizing signal, comprising:

6. the method as described in claim 3 or 4, is characterized in that:

7. the method as described in claim 3 or 4, is characterized in that:

As p=q=1, described PD2DSS and the time-domain position of described SD2DSS in subframe, specifically comprise:

8. the method as described in claim 3 or 4, is characterized in that:

Before the described D2DSS of transmission, described method also comprises:

9. method as claimed in claim 8, is characterized in that:

Described D2D transmitting terminal sends D2DSS on the pre-configured running time-frequency resource of network side, comprising:

10. a transmission method for the synchronizing signal of device-to-device, comprising:

11. methods as claimed in claim 10, is characterized in that:

On frequency domain, respectively by individual RB composition, i=1,2 ..., n;

12. methods as claimed in claim 11, is characterized in that:

13. methods as claimed in claim 11, is characterized in that:

Described PD2DS and described SD2DSS carries root sequence;

14. methods as described in claim 12 or 13, is characterized in that:

Before the described D2DSS of reception, described method also comprises:

15. methods as claimed in claim 14, is characterized in that:

Described D2D receiving terminal receives D2DSS on the pre-configured running time-frequency resource of network side, comprising:

16. methods as claimed in claim 14, is characterized in that:

The transmitting terminal of the synchronizing signal of 17. 1 kinds of device-to-devices, comprising:

18. transmitting terminals as claimed in claim 17, is characterized in that:

19. transmitting terminals as claimed in claim 18, is characterized in that:

20. transmitting terminals as claimed in claim 18, is characterized in that:

21. transmitting terminals as described in claim 19 or 20, is characterized in that:

22. transmitting terminals as described in claim 19 or 20, is characterized in that:

23. transmitting terminals as described in claim 19 or 20, is characterized in that:

24. transmitting terminals as described in claim 19 or 20, is characterized in that:

Described configuration module, also for before the described D2DSS of transmission, consults about to fix on D2D receiving terminal and the pre-configured running time-frequency resource in consolidated network side sends and receives described D2DSS.

25. transmitting terminals as claimed in claim 24, is characterized in that: also comprise:

The receiving terminal of the synchronizing signal of 26. 1 kinds of device-to-devices, comprising:

27. receiving terminals as claimed in claim 26, is characterized in that:

On frequency domain, respectively by individual RB composition, i=1,2 ..., n;

28. receiving terminals as claimed in claim 27, is characterized in that:

29. receiving terminals as claimed in claim 27, is characterized in that:

30. receiving terminals as described in claim 28 or 29, is characterized in that:

Described configuration module, also for before the described D2DSS of reception, consults about to fix on D2D transmitting terminal and the pre-configured running time-frequency resource in consolidated network side receives and sends described D2DSS.

31. receiving terminals as claimed in claim 30, is characterized in that:

Described receiver module, for receiving D2DSS on the pre-configured running time-frequency resource of described network side, comprising:

32. receiving terminals as claimed in claim 30, is characterized in that:

The transmission system of the synchronizing signal of 33. 1 kinds of device-to-devices, comprising: the transmitting terminal as described in claim 17 ~ 25 and the receiving terminal as described in claim 26 ~ 32.