CN105472701A - D2D (Device to Device) discovery signal transmitting method and D2D(Device to Device) discovery signal transmitting device in LTE network - Google Patents

Abstract

The invention discloses a D2D (Device to Device) discovery signal transmitting method. Through receiving semi-static configuration of an eNB, the position and the size of a DRP are acquired; according to eNB indication, a resource jump range and the number of retransmission of discovery signals in each period are determined; and according to the above parameters and the corresponding resource jump mode, the resource position for transmitting a reference signal in each period is determined. When the method and the device of the invention are applied, the signaling burden of the wireless network and loss of the wireless resources can be reduced.

Description

D2D in a kind of LTE network finds signaling method and device

Technical field

The application relates to mobile communication technology field, and specifically, the D2D that the application relates in a kind of LTE network finds signaling method and device.

Background technology

At present, D2D (DevicetoDevice) communication technology relies on its huge potential value in public safety field and the normal domestic communications field, accepted by 3GPP standard, become candidate's evolution tendency of LTE-A (LTEAdvanced) system.

According to current 3GPP conclusion, support that the UE (hereinafter referred to as UE) of D2D function will adopt semiduplex mode to carry out transmission and the reception of D2D signal, namely UE receives and dispatches while not supporting D2D signal.When UE is under wireless network coverage condition, D2D communication only will take uplink carrier frequencies (FDD system) or sub-frame of uplink (TDD system).

Because UE works in a half duplex mode, so if multiple UE sends at one time find signal (DS, DiscoverySignal), namely send DS in the mode of channeling (FDM), then this part terminal cannot find the other side.

In order to solve above-mentioned half-duplex restriction, the Resourse Distribute of time-multiplexed (TDM) can, by repeatedly dispatching, send the UE of DS to above-mentioned employing FDM mode by eNB.But this mode will introduce a large amount of signaling consumptions.

Another mode is eNB by the semi-static instruction of broadcast for sending resource pool (DRP) position and size that find signal, wherein DRP can be used for UE to send the resource collection finding signal, each DRP comprises T × F Resource Unit (RU), as shown in Figure 1.In each cycle, eNB is that application finds that the UE of resource divides the RU being used in carrying discovery signal in DRP.Here cycle can be the discovery cycle etc.In each cycle, the transmission for UE distribution finds the location index t of RU in time domain of signal _psent the position t of RU in time domain of discovery signal in the last cycle relative to this UE _p-1produce f _p-1skew, wherein f _p-1for this UE last cycle send find signal RU at the location index of frequency domain; Meanwhile, the frequency domain position f of the RU finding signal is sent in period p _palso relatively certain deviation f will be produced _p-1.Above-mentioned resource saltus step process as shown by the following formula.

T _p=mod (f _p-1+ t _p-1× F+ Δ, T) or t _p=mod (f _p-1+ t _p-1, T) and (1)

F _p=mod (floor ((f _p-1+ t _p-1× F) T)+Δ, F) or f _p=mod (f _p-1+ c, F) (2)

Wherein Δ and c are Dynamic gene.By this mode, can ensure that the subframe position that the multiple UE sending discovery signal in same subframe in frequency division multiplexing (FDM) mode in period p-1 send discovery signal in period p is different, thus the half-duplex between above-mentioned UE can be avoided to limit.

But there is a serious defect in this mode, in real network, find that the UE number of signal transmission resource (hereinafter referred to as finding resource) dynamically changes to eNB request in different cycles, but, because the size of DRP is semi-static configuration, the number of resources that this UE just causing the size of DRP can not adjust in real time to adapt to the transmission of current actual participation discovery signal takies.When the number of resources that the UE that reality sends discovery signal takies is less than the resource number comprised in DRP, after carrying out resource saltus step according to formula (1) and formula (2), the transmission resource that above-mentioned reality sends the UE finding signal will be distributed within the scope of whole DRP, in DRP not by the Radio Resource that uses by divided, and divided Radio Resource is difficult to be re-used in LTE system, this causes the waste of Radio Resource the most at last.

Under the prerequisite can eliminating half-duplex restriction, the signaling consumption as how lower realizes the instruction that D2D finds resource, and avoids the waste of Radio Resource, and this problem does not still have ripe solution at present.

Summary of the invention

This application provides D2D in a kind of LTE network and find the sending method of signal, can, with lower signaling consumption, indicate UE to send resource location in a flexible way, more efficiently utilize and find that resource carries out the transmission that D2D finds signal.

D2D in LTE network finds a signaling method, comprising:

UE receives the signaling that eNB sends, and determines the position and the size that send the resource pool DRP finding signal, and the initial resource allocation instruction of described UE;

Before each period p, described UE determines that resource saltus step scope in respective cycle p and D2D find the transmission times k of signal _p;

In each period p, described UE determines to send the logical time-frequency Domain Index that D2D finds signal in this period p according to the resource saltus step scope in this period p and the instruction of described initial resource allocation, then according to the k in described logical time-frequency Domain Index and respective cycle _p, determine in this period p, to send the time-frequency domain index (t that D2D finds signal _p, f _p), and in described DRP time-frequency domain index (t _p, f _p) resource location that indicates sends described D2D find signal;

Wherein, t _pthe index of transmission resource place subframe in described DRP of signal is found, f for sending D2D in period p _pfor the index of described transmission resource place frequency domain resource on whole upstream bandwidth or in described DRP in period p.

Preferably, described UE determines the k in respective cycle p _pcomprise: before each cycle, described UE receives the instruction that eNB sends, and the k in respective cycle p is carried in this instruction _p; Or UE receives the discovery signal transmission times k of the semi-static instruction of described eNB, using this k as the rhythmic discovery signal transmission times k in this semi-static configuration term of validity _p.

Preferably, described UE determines that the time domain size of the resource saltus step scope in the cycle is identical with the time domain size of described DRP;

Described UE determines the frequency domain size F ' of the resource saltus step scope in respective cycle p _pcomprise:

UE receives the frequency domain size F' of the resource saltus step scope of the semi-static instruction of described eNB, using this F' as the rhythmic frequency domain size F ' in this semi-static configuration term of validity _p; Or,

Before each cycle, described UE receives the instruction that eNB sends, and the F ' in respective cycle p is carried in this instruction _p; Or,

Described UE is according to the k in period p _pcalculate wherein, described T and F is respectively time domain and the frequency domain size of described DRP.

Preferably, described UE determines the frequency domain size F ' of the resource saltus step scope in period p _pidentical with the frequency domain size F of described DRP;

Described UE determines the time domain size T ' of the resource saltus step scope in period p _pcomprise: before each cycle, described UE receives the instruction that eNB sends, and the T ' in respective cycle p is carried in this instruction _p.

Preferably, describedly determine to send in period p Domain Index when D2D finds the logic of signal comprise:

${\tilde{t}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1}\×F_p^{\′}+\mathrm{\Δ},T)$ Or ${\tilde{t}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1},T);$

The described logical tone Domain Index determining transmission D2D discovery signal in period p comprise:

${\tilde{f}}_p=\mathrm{mod}(\mathrm{floor}(({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1}\×F_p^{\′})/T)+\mathrm{\Δ},F_p^{\′})$ Or ${\tilde{f}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+c,F_p^{\′}).$

Preferably, describedly determine to send in period p Domain Index when D2D finds the logic of signal comprise:

${\tilde{t}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1}\×F+\mathrm{\Δ},T_p^{\′})$ Or ${\tilde{t}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1},T_p^{\′});$

The described logical tone Domain Index determining transmission D2D discovery signal in period p comprise:

${\tilde{f}}_p=\mathrm{mod}(\mathrm{floor}(({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1}\×F)/T_p^{\′})+\mathrm{\Δ},F)$ Or ${\tilde{f}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+c,F).$

Preferably, when period p is one-period, ${\tilde{t}}_{p-1}={\tilde{t}}_0,{\tilde{f}}_{p-1}={\tilde{f}}_0,$ Wherein, with be respectively described initial resource allocation and indicate the time-frequency domain index comprised.

Preferably, when period p is one-period, wherein, with be respectively described initial resource allocation and indicate the time-frequency domain index comprised.

Preferably, k is worked as _pwhen=1,

Describedly determine to send in period p the time Domain Index t that D2D finds signal _pcomprise:

The described frequency domain index f determining transmission D2D discovery signal in period p _pcomprise:

wherein, f _pthe index of transmission resource place frequency domain resource on whole upstream bandwidth of signal is found, R for sending D2D in period p _pUCCHthe bandwidth of the frequency domain resource at PUCCH transmission and PUCCH protection interval is used for for upstream bandwidth head end and end; Or, wherein, f _pthe index of transmission resource place frequency domain resource on whole upstream bandwidth of signal is found for sending D2D in period p.

Preferably, k is worked as _pduring >1,

According to restriction relation determine in period p, to send the time Domain Index that D2D finds signal, wherein, $r_p=\mathrm{mod}({\tilde{t}}_p\×F_p^{\′}+{\tilde{f}}_p,C_T^{k_p}),$ t _p,ithe index of resource place subframe in DRP is sent for sending for i-th time in period p when D2D finds signal;

Describedly determine that sending D2D in period p finds that the frequency domain index of signal comprises: wherein, f _p,ithe index of resource place frequency domain resource on whole upstream bandwidth is sent for sending for i-th time in period p when D2D finds signal; Or, wherein, f _p,ithe index of resource place frequency domain resource on whole upstream bandwidth is sent for sending for i-th time in period p when D2D finds signal.

Preferably, k is worked as _pduring >1,

According to restriction relation determine in period p, to send the time Domain Index that D2D finds signal, wherein, $r_p=\mathrm{mod}({\tilde{t}}_p\×F+{\tilde{f}}_p,C_{T_p^{\′}}^{k_p}),$ t _p,ithe index of resource place subframe in DRP is sent for sending for i-th time in period p when D2D finds signal;

Describedly determine that sending D2D in period p finds that the frequency domain index of signal comprises: wherein, f _p,ithe index of resource place frequency domain resource on whole upstream bandwidth is sent for sending for i-th time in period p when D2D finds signal; Or, wherein, f _p,ithe index of resource place frequency domain resource on whole upstream bandwidth is sent for sending for i-th time in period p when D2D finds signal.

Preferably, as described F ' _pfor the F ' carried in the instruction that eNB before each cycle sends _ptime, or, as described F ' _pfor according to the k in period p _pcalculate F ' _ptime, if the logical tone Domain Index that described UE sends resource described in period p-1 is greater than F ' _p,

Or, as T ' _pfor the T ' carried in the instruction that eNB before each cycle sends _ptime, if described UE Domain Index when sending the logic of resource described in period p-1 is greater than T ' _p, or, if Domain Index is not more than T ' when sending the logic of resource described in described period p-1 _pand k>1, and UE sends index corresponding to resource in period p-1

Then the method comprises further: described UE again obtained the transmission resource instruction of eNB before described period p;

Describedly determine that sending D2D in period p finds that the logical time-frequency Domain Index of signal comprises: the transmission resource again obtained is indicated the time-frequency domain index comprised by described UE with respectively as the logical time-frequency Domain Index sending resource described in period p-1, for determining the logical time-frequency Domain Index sending resource described in period p, or the transmission resource again obtained is indicated the time-frequency domain index comprised by described UE with directly as the logical time-frequency Domain Index sending resource described in period p; Wherein, k is the discovery signal transmission times of the semi-static instruction of eNB.

Preferably, described F ' _pfor the F ' of eNB instruction before each period p _ptime, described eNB sends the UE sum N finding signal according to period p _d2Dand/or upstream traffic N in period p _uLdetermine described F ' _p.

Preferably, if upstream traffic is higher than upstream traffic in period p-1 in the UE up cache information determination period p that eNB reports according to UE, or eNB is according to the PUSCH error rate be currently received, determine to need to utilize the resource of DRP place subframe to carry out the re-transmission of PUSCH in period p, and resource requirement amount is higher than period p-1, then eNB reduces F ' _pvalue.

Preferably, F ' _p=min (N _d2D× k/T, F-N _uL), described T and F is respectively time domain and the frequency domain size of described DRP, and k is the discovery signal transmission times of the semi-static instruction of eNB.

Preferably, described eNB sends the UE sum N finding signal according to period p _d2Dand/or upstream traffic N in period p _uLdetermine described T ' _p.

Preferably, if upstream traffic is higher than upstream traffic in period p-1 in the UE up cache information determination period p that eNB reports according to UE, or eNB is according to the PUSCH error rate be currently received, determine to need to utilize the resource of DRP place subframe to carry out the re-transmission of PUSCH in period p, and resource requirement amount is higher than period p-1, then eNB reduces T ' _pvalue.

Preferably, T ' _p=min (M _d2D× k/F, T-M _uL), described T and F is respectively time domain and the frequency domain size of described DRP, and k is the discovery signal transmission times of the semi-static instruction of eNB.

Preferably, described UE determines that the time domain size of the resource saltus step scope in the cycle is identical with the time domain size of described DRP;

Described UE determines the frequency domain size F ' of the resource saltus step scope in respective cycle p _pcomprise: wherein, described F is the frequency domain size of described DRP.

Preferably, describedly to determine in period p that first time sends Domain Index when D2D finds the logic of the transmission resource of signal comprise:

${\tilde{t}}_{p,0}=\mathrm{mod}({\tilde{f}}_{p-1,k_{p-1}-1}+{\tilde{t}}_{p-1,k_{p-1}}\×F_p^{\′}+\mathrm{\Δ},T)$ Or ${\tilde{t}}_{p,0}=\mathrm{mod}({\tilde{f}}_{p-1,k_{p-1}-1}+{\tilde{t}}_{p-1,k_{p-1}},T);$

The described logical tone Domain Index determining the transmission resource of first time transmission D2D discovery signal in period p comprise:

${\tilde{f}}_{p,0}=\mathrm{mod}(\mathrm{floor}(({\tilde{f}}_{p-1,k_{p-1}-1}+{\tilde{t}}_{p-1,k_{p-1}-1}\×F_p^{\′})/T)+\mathrm{\Δ},F_p^{\′})$ Or ${\tilde{f}}_{p,0}=\mathrm{mod}({\tilde{f}}_{p-1,k_{p-1}-1}+c,F_p^{\′}).$

Preferably, when period p is one-period, wherein, with be respectively described initial resource allocation and indicate the time-frequency domain index comprised.

Preferably, when period p is one-period, wherein, with be respectively described initial resource allocation and indicate the time-frequency domain index comprised.

Preferably, described Domain Index when determining that the jth in period p except first time sends time sends the logic of D2D discovery signal comprise:

${\tilde{t}}_{p,j}=\mathrm{mod}({\tilde{f}}_{p,j-1}+{\tilde{t}}_{p,j-1}\×F_p^{\′}+\mathrm{\Δ},T)$ Or ${\tilde{t}}_{p,j}=\mathrm{mod}({\tilde{f}}_{p,j-1}+{\tilde{t}}_{p,j-1},T);$

The described logical tone Domain Index determining the interior jth except first time sends of period p time transmission D2D discovery signal comprise:

$\begin{array}{c}{\tilde{f}}_{p,j}=\mathrm{mod}(\mathrm{floor}(({\tilde{f}}_{p,j-1}+{\tilde{t}}_{p,j-1}\&times;F_p^{\&prime;})/T)+\mathrm{\&Delta;},F_p^{\&prime;})+(j-1)\&times;F_p^{\&prime;}\\ {\tilde{f}}_{p,j}=\mathrm{mod}({\tilde{f}}_{p,j-1}+c,F_p^{\&prime;})+(j-1)\&times;F_p^{\&prime;}\end{array}$ Or; Wherein, 0<j<k _p.

Preferably, describedly determine to send in period p the time Domain Index t that D2D finds signal _pcomprise:

The described frequency domain index f determining transmission D2D discovery signal in period p _pcomprise:

wherein, f _p,ithe index of resource place frequency domain resource on whole upstream bandwidth is sent, R for sending for i-th time in period p when D2D finds signal _pUCCHthe bandwidth of the frequency domain resource at PUCCH transmission and PUCCH protection interval is used for for upstream bandwidth head end and end; Or, wherein, f _p,ithe index of resource place frequency domain resource on whole upstream bandwidth is sent for sending for i-th time in period p when D2D finds signal.

Preferably, if the logical tone Domain Index that described UE sends resource in period p-1 is greater than F ' _p, then described UE is determining described F ' _pafter, the method comprises further: described UE obtains the transmission resource instruction of eNB again;

Describedly determine that sending D2D in period p finds that the logical time-frequency Domain Index of signal comprises: the transmission resource again obtained is indicated the time-frequency domain index comprised by described UE with the logical time-frequency Domain Index of the transmission resource of D2D signal is sent, for determining the logical time-frequency Domain Index sending resource in period p for each time respectively as first time in period p-1; Or the transmission resource again obtained is indicated the time-frequency domain index comprised by described UE with the logical time-frequency Domain Index of the transmission resource of D2D signal is directly sent as first time in period p, and according to this with determine the logical time-frequency Domain Index sending the transmission resource of D2D signal in period p for all the other each time.

D2D in LTE network finds a sender unit, comprising: resource pool determining unit, transmission resource determining unit and signal transmitting unit;

Described resource pool determining unit, for receiving the signaling that eNB sends, determining the position and the size that send the resource pool DRP finding signal, and indicating to the initial resource allocation of described UE;

Described transmission resource determining unit, for before each period p, determines that resource saltus step scope in respective cycle and D2D find the transmission times k of signal _p; And in each period p, determine to send the logical time-frequency Domain Index that D2D finds signal in this period p according to the resource saltus step scope in this cycle and the instruction of described initial resource allocation, then according to the k in described logical time-frequency Domain Index and respective cycle _p, determine in this period p, to send the time-frequency domain index that D2D finds signal;

Described signal transmitting unit, in each period p, time-frequency domain index (t in described DRP _p, f _p) resource location that indicates sends described D2D find signal;

Wherein, t _pthe index of transmission resource place subframe in described DRP of signal is found, f for sending D2D in period p _pthe index of transmission resource place frequency domain resource on whole upstream bandwidth or in described DRP of signal is found for sending D2D in period p.

The technical scheme that the application proposes, UE obtains position and the size of DRP by the semi-static configuration receiving eNB, then determine resource saltus step scope according to eNB instruction and in each cycle, find the number of retransmissions of signal, then determine in each cycle, to send the resource location finding reference signal according to above-mentioned parameter and corresponding resource hop mode.The implementation different according to the application, only need the coordination of a small amount of radio network signaling that different UEs just can be avoided to find the collision completely of signal, realize the mutual discovery between any two UE in group in the short period of time, the signaling burden of the reduction wireless network of amplitude peak and the loss of Radio Resource.In addition, the such scheme that the application proposes, very little to the change of existing system, can not the compatibility of influential system, and realize simple, efficient.

Accompanying drawing explanation

Fig. 1 is DRP structural representation;

Fig. 2 is the sending method overall procedure schematic diagram that in the application, D2D finds signal;

Fig. 3 is the dispensing device basic structure schematic diagram that in the application, D2D finds signal.

Embodiment

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

In ensuing description, except specified otherwise, described mutual discovery is for the UE in a D2D group, and the UE in D2D group is in Time and Frequency Synchronization state, or synchronous error is in UE receiver permissible range.

The application is mainly for the mutual discovery procedure of UE in D2D communication.The mutual discovery of UE is the prerequisite of D2D communication, and according to prior art, a kind of possible scheme is the mutual discovery being realized UE by the coordination of radio network signaling, and this will seriously increase the signaling burden of wireless network.Another kind of possible scheme is the DRP size of UE according to the semi-static configuration of eNB, according to a certain resource hop mode, sends the time-frequency domain index of the transmission resource of the time-frequency domain index determination current period of resource based on the last cycle.But this mode is when actual participation finds that the number of resources that the UE that signal sends takies is less than DRP total number resource, will cause serious waste of radio resources.

In order to solve the problem, the embodiment of the present application proposes the sending method that a kind of D2D finds signal, as shown in Figure 2, comprises the following steps:

The signaling that step 210:UE reception eNB sends obtains DRP position and the size of semi-static configuration, and initial resource allocation instruction.

The signaling that eNB mentioned here sends can be RRC signaling or other signalings, and RRC signaling can be the specific RRC signaling of broadcast and UE, can comprise many RRC information.

Wherein the position of DRP comprises time-domain position and the frequency domain position of the RU that DRP comprises, the RU number F that the size of DRP refers to the RU number T that DRP comprises in time domain and comprises on frequency domain.

Initial resource allocation instruction refers to that UE initiates to find after resource request to eNB, UE from eNB obtain about the signaling finding Resourse Distribute.UE determines first discovery cycle according to this indication information, and finds the position of resource in follow-up each discovery cycle.

Step 220: before period p, UE determines the resource saltus step scope in period p, and determines the transmission times k finding signal in period p.

In period p, resource saltus step scope can be identical with DRP size, and remain unchanged in multiple cycle.Or be the subset of DRP, and all may change within each cycle, in this case, UE needs the signaling receiving eNB before period p, determines the resource saltus step scope in period p.

Find in period p the transmission times k of signal be not less than 1 integer.The value of k can remain unchanged within multiple cycle, and in this case, UE determines the discovery signal transmission times in above-mentioned multiple cycle by the semi-static signaling receiving eNB.Or the value of k can with cyclomorphosis, and in this case, UE needed before period p, received the signaling of eNB, determined the k value in period p.

The information that step 230:UE obtains according to step 210 and step 220, determine to send the position finding signal in period p, and transmission finds signal.

Wherein, in each period p, UE determines to send the logical time-frequency Domain Index that D2D finds signal in this period p according to the resource saltus step scope in this period p and initial resource allocation instruction, again according to the transmission times in logical time-frequency Domain Index and respective cycle, determine in this period p, to send the time-frequency domain index (t that D2D finds signal _p, f _p), and time-frequency domain index (t in the DRP determined in step 210 _p, f _p) resource location that indicates sends D2D find signal.

For the ease of understanding the application, below in conjunction with embody rule situation, be described further specific as follows to the application's technique scheme:

Embodiment one:

In the present embodiment, eNB is by semi-static position and the time domain size T and frequency domain size F configuring DRP of signaling.Meanwhile, eNB semi-static indexed resource saltus step scope.Find in each discovery cycle that the transmission times of signal may change.UE is according to the discovery signal transmission times k of above-mentioned parameter and current period _pdetermine the transmission position finding signal in period p, concrete steps are as follows:

Step 310:UE receives the signaling of eNB, obtains position and the time domain size T and frequency domain size F of DRP, and resource saltus step scope and initial resource instruction.

The frequency domain size F of DRP can be indicated by direct or indirect mode.If be direct mode, then by signaling, eNB directly notifies that UE takies the initial sum final position of frequency domain resource at DRP subframe DRP.If be indirect mode, then eNB indicates R by signaling _pUCCH, R _pUCCHcomprise upstream bandwidth head end and end protect interval frequency domain resource for PUCCH transmission and PUCCH, this part resource can not be used for D2D and find Signal transmissions, removes R in up-link bandwidth _pUCCHother bandwidth resources outside indexed resource form DRP, then the frequency domain size F=B of DRP _w-2 × R _pUCCH, wherein B _wfor up-link bandwidth.

The time domain size of the scope of resource saltus step is in the present embodiment equal with DRP, the frequency domain size F '≤F of resource saltus step scope.This resource saltus step scope is the semi-static configuration in base station to UE, and concrete base station determines that mode the application of resource saltus step scope does not limit.

The above-mentioned signaling being used to indicate initial resource is the specific signaling of UE, and UE determines the position, logical time-frequency territory of initialization resource by initial resource instruction with

Step 320:UE receives eNB signaling, determines the discovery signal transmission times k of period p _p.

Above-mentioned signaling is common signaling, should for UE participating in finding that signal sends and receives all in community.

Step 330:UE determines to send the resource location finding signal in period p, and sends discovery signal.

If k _p=1, then UE is according to the logical time-frequency Domain Index sending resource in following formula determination period p:

${\tilde{t}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1}\&times;F\&prime;+\mathrm{\&Delta;},T)$ Or ${\tilde{t}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1},T)---\left(3\right),$

${\tilde{f}}_p=\mathrm{mod}(\mathrm{floor}(({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1}\&times;F_p^{\&prime;})/T)+\mathrm{\&Delta;},F\&prime;)$ Or ${\tilde{f}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+c,F\&prime;)---\left(4\right).$

The time-frequency domain index sending resource in period p is determined by following formula:

$t_p={\tilde{t}}_p---\left(5\right),$

Or,

Wherein t _pfor sending the index of resource place subframe in DRP, the f in formula (6) _pfor sending the index of resource place frequency domain resource on whole upstream bandwidth, the f in formula (7) _pfor sending the index of resource place frequency domain resource in DRP.Formula (6) or (7) can be taked to calculate the index determining frequency domain resource according to actual conditions.Such as, when the frequency domain size F of DRP is directly sent to UE by base station in step 310, UE can take formula (7) to determine frequency domain index; When base station in step 310 is only by resource R _pUCCHwhen informing UE, UE can take formula (6) to determine frequency domain index.Here, due to k _p=1, therefore only need in period p to determine a time-frequency domain index sending resource, use t _pand f _prepresent.

If k _p>1, then UE determines according to formula (3) and formula (4) the logical time-frequency Domain Index sending resource in period p, and the time-frequency domain index sending resource in period p is determined by following formula:

Or,

Wherein, $r_p=\mathrm{mod}({\tilde{t}}_p\&times;F\&prime;+{\tilde{f}}_p,C_T^{k_p}),$ first according to the time Domain Index t sending resource in the restriction relation determination period p of formula (8) for each time _p,i, then, then determine according to formula (9) or (10) the frequency domain index sending resource in period p for each time.T _p,ifor sending the index of resource place subframe in DRP, the f in formula (9) when sending for i-th time and find signal in period p _p,ifor sending the index of resource place frequency domain resource on whole upstream bandwidth, the f in formula (10) when sending for i-th time and find signal in period p _pfor sending the index of resource place frequency domain resource in DRP.Formula (9) or (10) can be taked to calculate the index determining frequency domain resource according to actual conditions.Such as, when the frequency domain size F of DRP and original position are directly sent to UE by base station in step 310, UE can take formula (10) to determine frequency domain index; When base station in step 310 is only by resource R _pUCCHwhen informing UE, UE can take formula (9) to determine frequency domain index.Here, due to k _p>1, therefore needs the time-frequency domain index determining multiple transmission resource, uses t in period p _p,iand f _p,irepresent.

In above-mentioned formula (8), (9) and (10), when time, above-mentioned simplified formula is:

Wherein, $r_p={\tilde{t}}_p\&times;F\&prime;+{\tilde{f}}_p,$ t _p,i sends for i-th time when finding signal in period p to send the index of resource place subframe in DRP, f in formula (12) _p,ifor sending the index of resource place frequency domain resource on whole upstream bandwidth when sending for i-th time and find signal in period p, f in formula (13) _p,ifor sending the index of resource place frequency domain resource on DRP when sending for i-th time and find signal in period p.

If current period p is the one-period after the instruction of UE acquisition initial resource, then UE can determine according to one of the following two kinds mode the time-frequency domain index sending resource:

One, determine according to formula (3) and formula (4) the logical time-frequency Domain Index sending resource in period p with now ${\tilde{t}}_{p-1}={\tilde{t}}_0,{\tilde{f}}_{p-1}={\tilde{f}}_0;$ Then, k is worked as _pdetermine according to formula (5) and formula (6) or formula (7) the time-frequency domain index sending resource in period p when=1, work as k _pdetermine according to formula (8) and formula (9) or formula (10) the time-frequency domain index sending resource in period p during >1;

Two, k is worked as _pdirectly determine according to formula (5) and formula (6) or formula (7) the time-frequency domain index sending resource in period p when=1, work as k _pdirectly determine according to formula (8) and formula (9) or formula (10) the time-frequency domain index sending resource in period p during >1, wherein, ${\tilde{t}}_p={\tilde{t}}_0,{\tilde{f}}_p={\tilde{f}}_0.$

So far, the present embodiment terminates.In this way, eNB can semi-static configuration can support under different discovery signal transmission times, to be the transmission resource pool DRP of maximum number of user and maximum number of times of transmission concentrated, can to avoid the generation of resource fragmentation like this by the resource used.And when transmission times k is greater than 1, can ensure individual transmission resource is not exclusively overlapping in time domain, and the half-duplex between above-mentioned UE can be avoided like this to limit.The scheme that the present embodiment proposes, in guarantee the transmission resource of individual UE is in time domain under incomplete overlapping prerequisite, and the number of sub frames of needs is relatively less, effectively can reduce D2D and find that signal is on the impact of cellular network signals, can reduce the waste of Radio Resource simultaneously.

Embodiment two:

In the present embodiment, eNB is by semi-static position and and the time domain size T and frequency domain size F configuring DRP of signaling.Before each discovery cycle, eNB dynamic indexed resource saltus step scope.The time domain size of the scope of resource saltus step is in the present embodiment equal with DRP, frequency domain size F ' _p≤ F.UE is according to the transmission position finding signal in the resource saltus step scope determination period p of above-mentioned parameter and current period, and concrete steps are as follows:

Step 410:UE receives the signaling of eNB, obtains the position of DRP, finds the transmission times k of signal, time domain size T and frequency domain size F, and initial resource instruction.

Identically with embodiment one, the frequency domain size F of DRP can be indicated by direct or indirect mode.If be direct mode, then by signaling, eNB directly notifies that UE takies the initial sum final position of frequency domain resource at DRP subframe DRP.If be indirect mode, then eNB indicates R by signaling _pUCCH, R _pUCCHcomprise upstream bandwidth head end or end protect interval frequency domain resource for PUCCH transmission and PUCCH, this part resource can not be used for D2D discovery Signal transmissions, then the frequency domain size F=B of DRP _w-2 × R _pUCCH, wherein B _wfor up-link bandwidth.

The above-mentioned signaling being used to indicate initial resource is the specific signaling of UE, and UE determines the position, logical time-frequency territory of initialization resource by initial resource instruction with in addition, in the present embodiment, the discovery signal transmission times in each cycle is identical, utilizes k to represent, this k is that the semi-static configuration of eNB is to UE's.

Step 420:UE received eNB signaling before period p, determined the resource saltus step scope of period p.

The above-mentioned signaling being used to indicate resource saltus step scope is common signaling, should for UE participating in finding that signal sends and receives all in community.The time domain size of the scope of resource saltus step is in the present embodiment equal with DRP, frequency domain size F ' _p≤ F.

The value of resource saltus step scope indication information and F ' in above-mentioned signaling _pcan be directly corresponding between value, such as the value of resource saltus step scope indication information bit field is v, and the value in this territory is F ' _pvalue, i.e. F ' _p=v; Or DRP is divided into multistage on frequency domain, the value instruction of resource saltus step scope indication information is used for the hop count of the resource of resource saltus step, and the such as value of resource saltus step scope indication information bit field is that after v, DRP segmentation, each section of size is s, then F ' _p=s × v.

F ' _pvalue determined by eNB.According to a kind of method of the application, eNB sends in period p the UE sum finding signal as required and determines F ' _pvalue.Such as, if needing to send in period p finds that the UE of signal adds up to F × T/2, then eNB can by the value of adjustment v by F ' _pbe set to F/2.According to the another kind of method of the application, eNB adjusts F ' according to upstream traffic in period p (PUSCH transmission) _pvalue.Such as, if upstream traffic is higher than upstream traffic in period p-1 in the UE up cache information determination period p that eNB reports according to UE, or eNB is according to the PUSCH error rate be currently received, determine to need to utilize the resource of DRP place subframe to carry out the re-transmission of PUSCH in period p, and resource requirement amount is higher than period p-1, then eNB is according to according to this information, reduces F ' _pvalue, to meet the demand of PUSCH transmission.

According to the third method of the application, eNB, according to above-mentioned two factors, namely needs the upstream traffic in the UE sum and period p of period p transmission discovery signal, the comprehensive F ' determined _pvalue, i.e. F ' _p=Γ (N _d2D, N _uL), wherein N _d2Drepresent and need to send the UE sum finding signal, N in period p _uLuplink service resource requirement in indication cycle p, the PUSCH in the period p that this value is estimated by eNB in average each subframe retransmits resource requirement N _rwith the PUSCH new biography resource requirement N in average each subframe _nweighting obtains, such as Γ represents N _d2Dand N _uLto F ' _pmapping relations, such as, F ' _p=min (N _d2D× k/T, F-N _uL).

Because resource saltus step scope may be different within each cycle, therefore the logical tone Domain Index determined according to the resource saltus step scope in a upper cycle may beyond the resource saltus step scope of current period, therefore, need in above-mentioned situation to obtain the instruction of new resource, for current period and the transmission Resource Calculation in each cycle thereafter.Particularly:

If the logical tone Domain Index that UE sends resource in period p-1 is greater than F ' _p, then eNB again should send resource for this UE distributes before period p, and namely UE needs the transmission resource instruction again obtaining eNB.If before period p, the transmission resource instruction that the unsuccessful eNB of detecting of UE re-issues, can operate according to the actual requirements, such as, abandon the transmission Resource Calculation of current period p; If before period p, UE successfully detects the transmission resource instruction that eNB re-issues, and (need special indicating, the transmission resource indication signaling that the eNB that UE detects re-issues can at instruction F ' _psignaling before or after, lower with), and resource time-frequency domain index is with then UE can according to the time-frequency domain index of the transmission resource of one of the following two kinds mode computing cycle p:

One, the logical time-frequency Domain Index that step 430 determines to send in period p resource is performed with and time-frequency domain index, now ${\tilde{t}}_{p-1}={{\tilde{t}}_0}^{\&prime;},{\tilde{f}}_{p-1}={{\tilde{f}}_0}^{\&prime;};$

Two, as k=1, UE determines to send resource time-frequency domain index in period p according to formula (5) and formula (6) or formula (7), determine in period p, to send resource time-frequency domain index according to formula (8) and formula (9) or formula (10) as k>1, now and the F' in formula (9), (10) is replaced with F ' _p.

If the logical tone Domain Index that UE sends resource in period p-1 is not more than F ' _p, then UE directly performs step 430.

Step 430:UE determines to send the resource location finding signal in period p, and sends discovery signal.

Work as k=1, then UE is according to the logical time-frequency Domain Index sending resource in following formula determination period p:

${\tilde{t}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1}\&times;F_p^{\&prime;}+\mathrm{\&Delta;},T)$ Or ${\tilde{t}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1},T)---\left(14\right),$

${\tilde{f}}_p=\mathrm{mod}(\mathrm{floor}(({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1}\&times;F_p^{\&prime;})/T)+\mathrm{\&Delta;},F_p^{\&prime;})$ Or ${\tilde{f}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+c,F_p^{\&prime;})---\left(15\right).$

The time-frequency domain index sending resource in period p is determined according to formula (5) in embodiment one and formula (6) or formula (7).

If k>1, then UE determines according to formula (14) and formula (15) the logical time-frequency Domain Index sending resource in period p, the time-frequency domain index sending resource in period p is determined according to formula (8) in embodiment one and formula (9) or formula (10), difference is, now 0≤i < k, and the F' in formula (9), (10) is replaced with F ' _p.

If current period p is the one-period after the instruction of UE acquisition initial resource, then UE can determine according to one of the following two kinds mode the time-frequency domain index sending resource:

One, determine according to formula (14) and formula (15) the logical time-frequency Domain Index sending resource in period p with now then, determine according to formula (5) and formula (6) or formula (7) the time-frequency domain index sending resource in period p as k=1, determine according to formula (8) and formula (9) or formula (10) the time-frequency domain index sending resource in period p as k>1, and the F' in formula (9), (10) is replaced with F ' _p;

Two, directly determine according to formula (5) and formula (6) or formula (7) the time-frequency domain index sending resource in period p as k=1, directly determine in period p, to send resource time-frequency domain index according to formula (8) and formula (9) or formula (10) as k>1, wherein and the F' in formula (9), (10) is replaced with F ' _p.

So far, the present embodiment terminates.According to this mode, eNB can find the number of the UE of resource according to current application, dynamic conditioning resource saltus step scope on frequency domain, can more effective use Radio Resource.

Embodiment three:

In the present embodiment, eNB is by the position of signaling semi-static configuration DRP and and the frequency domain size F of time domain size T and DRP.Within each discovery cycle, find that the transmission times of signal may change.UE is according to the discovery signal transmission times k of above-mentioned parameter and current period _pdetermine the transmission position finding signal in period p, concrete steps are as follows:

Step 510:UE receives eNB signaling, obtains the position of DRP, time domain size T and frequency domain size F, and initial resource instruction.

Identically with embodiment one, the frequency domain size F of DRP can be indicated by direct or indirect mode.If be direct mode, then by signaling, eNB directly notifies that UE takies the initial sum final position of frequency domain resource at DRP subframe DRP.If be indirect mode, then eNB indicates R by signaling _pUCCH, R _pUCCHcomprise upstream bandwidth head end or end protect interval frequency domain resource for PUCCH transmission and PUCCH, this part resource can not be used for D2D discovery Signal transmissions, then the frequency domain size F=B of DRP _w-2 × R _pUCCH, wherein B _wfor up-link bandwidth.

The above-mentioned signaling being used to indicate initial resource is the specific signaling of UE, and UE determines the position, logical time-frequency territory of initialization resource by initial resource instruction with

Step 520:UE receives eNB signaling, determines the discovery signal transmission times k of period p _p, and determine the frequency domain size of resource saltus step scope in period p further.

Above-mentionedly be used to indicate k _psignaling be common signaling, should in community all participate in find signal send and receive UE.The time domain size of resource saltus step scope is identical with the time domain size of DRP, frequency domain size F ' _pand k _pmeet following restriction relation:

Due to resource saltus step scope and transmission times k _pmay be different within each cycle, therefore the logical tone Domain Index determined according to the resource saltus step scope in a upper cycle may beyond the resource saltus step scope of current period, therefore need to obtain the instruction of new resource, for current period and the transmission Resource Calculation in each cycle thereafter.Particularly:

If the logical tone Domain Index that UE sends resource in period p-1 is greater than F ' _p, then eNB again should send resource for this UE distributes before period p, and namely UE needs the transmission resource instruction again obtaining eNB.If before period p, the transmission resource instruction that the unsuccessful eNB of detecting of UE re-issues, can operate according to the actual requirements, such as, abandon the transmission Resource Calculation of current period p; If before period p, UE successfully detects the transmission resource instruction that eNB re-issues, and resource time-frequency domain index is with then UE can according to the time-frequency domain index of the transmission resource of one of the following two kinds mode computing cycle p:

One, perform step 530 to determine to send the logical time-frequency Domain Index sending resource when finding signal each time in period p with and time-frequency domain index, now

Two, UE directly determines to send resource time-frequency domain index in period p according to formula (5) and formula (6) or formula (7), now with determine according to formula (18) and (19), and by the t in formula (5), (6), (7) _p, f _pwith replace with t respectively _p,i, fp, i and

Step 530:UE determines to send the resource location finding signal in period p, and sends discovery signal.

UE sends the logical time-frequency Domain Index of resource according to first time in following formula determination period p:

${\tilde{t}}_{p,0}=\mathrm{mod}({\tilde{f}}_{p-1,k_{p-1}-1}+{\tilde{t}}_{p-1,k_{p-1}}\&times;F_p^{\&prime;}+\mathrm{\&Delta;},T)$ Or ${\tilde{t}}_{p,0}=\mathrm{mod}({\tilde{f}}_{p-1,k_{p-1}-1}+{\tilde{t}}_{p-1,k_{p-1}},T)$ (16)，

${\tilde{f}}_{p,0}=\mathrm{mod}(\mathrm{floor}(({\tilde{f}}_{p-1,k_{p-1}-1}+{\tilde{t}}_{p-1,k_{p-1}-1}\&times;F_p^{\&prime;})/T)+\mathrm{\&Delta;},F_p^{\&prime;})$ Or ${\tilde{f}}_{p,0}=\mathrm{mod}({\tilde{f}}_{p-1,k_{p-1}-1}+c,F_p^{\&prime;})$ (17)。

UE sends for repeating the transmission resource logic time-frequency domain index finding signal according in following formula determination period p:

${\tilde{t}}_{p,j}=\mathrm{mod}({\tilde{f}}_{p,j-1}+{\tilde{t}}_{p,j-1}\&times;F_p^{\&prime;}+\mathrm{\&Delta;},T)$ Or ${\tilde{t}}_{p,j}=\mathrm{mod}({\tilde{f}}_{p,j-1}+{\tilde{t}}_{p,j-1},T)---\left(18\right),$

$\begin{array}{c}{\tilde{f}}_{p,j}=\mathrm{mod}(\mathrm{floor}(({\tilde{f}}_{p,j-1}+{\tilde{t}}_{p,j-1}\&times;F_p^{\&prime;})/T)+\mathrm{\&Delta;},F_p^{\&prime;})+(j-1)\&times;F_p^{\&prime;}\\ {\tilde{f}}_{p,j}=\mathrm{mod}({\tilde{f}}_{p,j-1}+c,F_p^{\&prime;})+(j-1)\&times;F_p^{\&prime;}\end{array}$ Or (19).

Wherein 0<j<k _p; The time-frequency domain index sending resource in period p is determined according to formula (5) in embodiment one and formula (6) or formula (7), and by the t in respective formula _p, fp and replace with t respectively _p,i, f _p,iwith wherein, 0≤i<k _p.

If current period p is the one-period after the instruction of UE acquisition initial resource, then UE can determine according to one of the following two kinds mode the time-frequency domain index sending resource:

One, determine according to formula (16) ~ (19) the logical time-frequency Domain Index sending resource in period p for each time with and time-frequency domain index, now then, determine according to formula (5) and formula (6) or formula (7) the time-frequency domain index sending resource in period p, and by F', the t in respective formula _p, fp and replace respectively and be respectively $F_p^{\&prime;},t_{p,i},{\tilde{t}}_{p,i},f_{p,i}$ With

Two, directly transmission resource time-frequency domain index in period p is determined according to formula (5) and formula (6) or formula (7), now with determine according to formula (18) and (19), and by the t in formula (5), (6), (7) _p, fp and replace t respectively _p,i, f _p,iwith

So far, the present embodiment terminates.According to this mode, eNB can find the number of the UE of resource according to current application, dynamic conditioning finds the transmission times of signal, makes full use of the Radio Resource in DRP.Compare with embodiment one, for different transmission times, unified resource jump method can be adopted to determine the transmission resource of UE, realize relatively simple, but the program requires F ' _p≤ T, otherwise the discovery signal of a UE repeatedly sends resource may appear at same subframe, and this limits the range of application of the program to a certain extent.

Embodiment four:

In the present embodiment, eNB is by semi-static position and the time domain size T and frequency domain size F configuring DRP of signaling.Meanwhile, find in each discovery cycle that the transmission times of signal may change, and resource saltus step scope also will change thereupon.UE is according to the discovery signal transmission times k of above-mentioned parameter and current period _pdetermine the transmission position finding signal in period p, concrete steps are as follows:

Step 610:UE receives the signaling of eNB, obtains the position of DRP, time domain size T and frequency domain size F, and initial resource instruction.

Identically with embodiment one, the frequency domain size F of DRP can be indicated by direct or indirect mode.If be direct mode, then by signaling, eNB directly notifies that UE takies the initial sum final position of frequency domain resource at DRP subframe DRP.If be indirect mode, then eNB indicates R by signaling _pUCCH, R _pUCCHcomprise upstream bandwidth head end or end protect interval frequency domain resource for PUCCH transmission and PUCCH, this part resource can not be used for D2D discovery Signal transmissions, then the frequency domain size F=B of DRP _w-2 × R _pUCCH, wherein B _wfor up-link bandwidth.

The above-mentioned signaling being used to indicate initial resource is the specific signaling of UE, and UE determines the position, logical time-frequency territory of initialization resource by initial resource instruction with

Step 620:UE receives eNB signaling, determines the discovery signal transmission times k of period p _p, and determine the frequency domain size F ' of resource saltus step scope further _p.

Above-mentioned signaling is common signaling, should for UE participating in finding that signal sends and receives all in community.Wherein the time domain size of resource saltus step scope is identical with the time domain size of DRP, frequency domain size F ' _pand k _pmeet following restriction relation:

Due to resource saltus step scope and transmission times k _pmay be different within each cycle, therefore the logical tone Domain Index determined according to the resource saltus step scope in a upper cycle may beyond the resource saltus step scope of current period, therefore need to obtain the instruction of new resource, for current period and the transmission Resource Calculation in each cycle thereafter.Particularly:

If the logical tone Domain Index that UE sends resource in period p-1 is greater than F ' _p, then eNB again should send resource for this UE distributes before period p, and namely UE needs the transmission resource instruction again obtaining eNB.If before period p, the transmission resource instruction that the unsuccessful eNB of detecting of UE re-issues, can operate according to the actual requirements, such as, abandon the transmission Resource Calculation of current period p; If before period p, UE successfully detects the transmission resource instruction that eNB re-issues, and resource time-frequency domain index is with then UE can according to the time-frequency domain index of the transmission resource of one of the following two kinds mode computing cycle p:

One, the logical time-frequency Domain Index that step 630 determines to send in period p resource is performed with and time-frequency domain index, now ${\tilde{t}}_{p-1}={{\tilde{t}}_0}^{\&prime;},{\tilde{f}}_{p-1}={{\tilde{f}}_0}^{\&prime;};$

Two, k is worked as _pwhen=1, UE determines to send resource time-frequency domain index in period p according to formula (5) and formula (6) or formula (7), works as k _pdetermine in period p, to send resource time-frequency domain index according to formula (8) and formula (9) or formula (10) during >1, now and the F' in formula (9), (10) is replaced with F ' _p.

Step 630:UE determines to send the resource location finding signal in period p, and sends discovery signal.

If k _p=1, then UE determines according to formula (14) in embodiment two and formula (15) the logical time-frequency Domain Index sending resource in period p, and determines the time-frequency domain index of transmission resource in period p according to formula (5) in embodiment one and formula (6) or formula (7) further.

If k _p>1, then UE determines according to formula (14) in embodiment two and formula (15) the logical time-frequency Domain Index sending resource in period p, the time-frequency domain index sending resource in period p is determined according to formula (8) in embodiment one and formula (9) or formula (10), difference is, now and the F' in formula (9), (10) is replaced with F ' _p.

If current period p is the one-period after the instruction of UE acquisition initial resource, then UE can determine according to one of the following two kinds mode the time-frequency domain index sending resource:

One, determine according to formula (14) and formula (15) the logical time-frequency Domain Index sending resource in period p with now then, k is worked as _pdetermine according to formula (5) and formula (6) or formula (7) the time-frequency domain index sending resource in period p when=1, work as k _pdetermine according to formula (8) and formula (9) or formula (10) the time-frequency domain index sending resource in period p during >1, and the F' in formula (9), (10) is replaced with F ' _p;

Two, k is worked as _pdirectly determine according to formula (5) and formula (6) or formula (7) the time-frequency domain index sending resource in period p when=1, work as k _pdirectly determine in period p, to send resource time-frequency domain index according to formula (8) and formula (9) or formula (10) during >1, wherein, and the F' in formula (9), (10) is replaced with F ' _p.

So far, the present embodiment terminates.In this way, according to current network environment and application, eNB can find that the number of users of resource dynamically changes the transmission times finding signal.And when transmission times k is greater than 1, can ensure the transmission resource of individual UE is not exclusively overlapping in time domain, and the half-duplex between above-mentioned UE can be avoided like this to limit.Compare with embodiment one because resource saltus step scope can along with the current number of users that can support dynamic conditioning, be conducive to reducing the complexity realized.

Embodiment five:

In the present embodiment, eNB is by semi-static position and and the time domain size T and frequency domain size F configuring DRP of signaling.Before each discovery cycle, eNB dynamic indexed resource saltus step scope.The frequency domain size of the scope of resource saltus step is in the present embodiment equal with DRP, time domain size T ' _p≤ T.UE is according to the transmission position finding signal in the resource saltus step scope determination period p of above-mentioned parameter and current period, and concrete steps are as follows:

Step 710:UE receives the signaling of eNB, obtains the position of DRP, finds the transmission times k of signal, time domain size T and frequency domain size F, and initial resource instruction.

Identically with embodiment one, the frequency domain size F of DRP can be indicated by direct or indirect mode.If be direct mode, then by signaling, eNB directly notifies that UE takies the initial sum final position of frequency domain resource at DRP subframe DRP.If be indirect mode, then eNB indicates R by signaling _pUCCH, R _pUCCHcomprise upstream bandwidth head end or end protect interval frequency domain resource for PUCCH transmission and PUCCH, this part resource can not be used for D2D discovery Signal transmissions, then the frequency domain size F=B of DRP _w-2 × R _pUCCH, wherein B _wfor up-link bandwidth.

The above-mentioned signaling being used to indicate initial resource is the specific signaling of UE, and UE determines the position, logical time-frequency territory of initialization resource by initial resource instruction with in addition, in the present embodiment, the discovery signal transmission times in each cycle is identical, utilizes k to represent, this k is that the semi-static configuration of eNB is to UE's.

Step 720:UE received eNB signaling before period p, determined the resource saltus step scope of period p.

The above-mentioned signaling being used to indicate resource saltus step scope is common signaling, should for UE participating in finding that signal sends and receives all in community.The frequency domain size of the scope of resource saltus step is in the present embodiment equal with DRP, time domain size T ' _p≤ T.

The value of resource saltus step scope indication information and T ' in above-mentioned signaling _pcan be directly corresponding between value, such as the value of resource saltus step scope indication information bit field is v, and the value in this territory is T ' _pvalue, i.e. T ' _p=v; Or DRP is divided into multistage in time domain, the value instruction of resource saltus step scope indication information is used for the hop count of the resource of resource saltus step, and the such as value of resource saltus step scope indication information bit field is that after v, DRP segmentation, each section of size is s, then T ' _p=s × v.

T ' _pvalue determined by eNB.According to a kind of method of the application, eNB sends in period p the UE sum finding signal as required and determines T ' _pvalue.Such as, if needing to send in period p the UE sum number finding signal is F × T/2, then eNB can by the value of adjustment v by T ' _pbe set to T/2.According to the another kind of method of the application, eNB adjusts T ' according to upstream traffic in period p (PUSCH transmission) _pvalue.Such as, if upstream traffic is higher than upstream traffic in period p-1 in the UE up cache information determination period p that eNB reports according to UE, or eNB is according to the PUSCH error rate be currently received, determine to need to utilize the resource of DRP place subframe to carry out the re-transmission of PUSCH in period p, and resource requirement amount is higher than period p-1, then eNB is according to according to this information, reduces T ' _pvalue, to meet the demand of PUSCH transmission.

According to the third method of the application, eNB, according to above-mentioned two factors, namely needs the upstream traffic in the UE sum and period p of period p transmission discovery signal, the comprehensive T ' determined _pvalue, i.e. T ' _p=Γ (M _d2D, M _uL), wherein N _d2Drepresent and need to send the UE sum finding signal, M in period p _uLuplink service resource requirement in indication cycle p, in the period p that this value is estimated by eNB, PUSCH retransmits required subframe M _rwith PUSCH new biography needed for number of sub frames M _nweighting obtains, such as Γ represents M _d2Dand M _uLto T ' _pmapping relations, such as, T ' _p=min (M _d2D× k/F, T-M _uL).

Because resource saltus step scope may be different within each cycle, therefore the logical tone Domain Index determined according to the resource saltus step scope in a upper cycle may beyond the resource saltus step scope of current period, therefore, need in above-mentioned situation to obtain the instruction of new resource, for current period and the transmission Resource Calculation in each cycle thereafter.Particularly:

If Domain Index is greater than T ' when UE sends the logic of resource in period p-1 _p, then eNB again should send resource for this UE distributes before period p, and namely UE needs the transmission resource instruction again obtaining eNB.If before period p, the transmission resource instruction that the unsuccessful eNB of detecting of UE re-issues, can operate according to the actual requirements, such as, abandon the transmission Resource Calculation of current period p; If before period p, UE successfully detects the transmission resource instruction that eNB re-issues, and (need special indicating, the transmission resource indication signaling that the eNB that UE detects re-issues can at instruction T ' _psignaling before or after, lower with), and resource time-frequency domain index is with then UE can according to the time-frequency domain index of the transmission resource of one of the following two kinds mode computing cycle p:

One, the logical time-frequency Domain Index that step 730 determines to send in period p resource is performed with and time-frequency domain index, now ${\tilde{t}}_{p-1}={{\tilde{t}}_0}^{\&prime;},{\tilde{f}}_{p-1}={{\tilde{f}}_0}^{\&prime;};$

Two, as k=1, UE determines to send resource time-frequency domain index in period p according to formula (5) and formula (6) or formula (7), determine in period p, to send resource time-frequency domain index according to formula (8) and formula (9) or formula (10) as k>1, now and the T in formula (9), (10) is replaced with T ' _p, F ' _preplace with F.

If Domain Index is not more than T ' when UE sends the logic of resource in period p-1 _pand k=1, or, k>1 and UE sends index corresponding to resource in period p-1 then UE directly performs step 730.

If Domain Index is not more than T ' when UE sends the logic of resource in period p-1 _p, but k> ₁, and UE sends index corresponding to resource in period p-1 then eNB again should send resource for this UE distributes before period p, and namely UE needs the transmission resource instruction again obtaining eNB.If before period p, the transmission resource instruction that the unsuccessful eNB of detecting of UE re-issues, UE operates according to the actual requirements, such as, abandon the transmission Resource Calculation of current period p; If before period p, UE successfully detects the transmission resource instruction that eNB re-issues, and resource time-frequency domain index is with then UE can according to the time-frequency domain index of the transmission resource of one of the following two kinds mode computing cycle p:

One, the logical time-frequency Domain Index that step 730 determines to send in period p resource is performed with and time-frequency domain index, now ${\tilde{t}}_{p-1}={{\tilde{t}}_0}^{\&prime;},{\tilde{f}}_{p-1}={{\tilde{f}}_0}^{\&prime;};$

Two, as k=1, UE determines to send resource time-frequency domain index in period p according to formula (5) and formula (6) or formula (7), determine in period p, to send resource time-frequency domain index according to formula (8) and formula (9) or formula (10) as k>1, now and the T in formula (9), (10) is replaced with T ' _p, F ' _preplace with F.

Step 730:UE determines to send the resource location finding signal in period p, and sends discovery signal.

Work as k=1, then UE is according to the logical time-frequency Domain Index sending resource in following formula determination period p:

${\tilde{t}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1}\&times;F+\mathrm{\&Delta;},T_p^{\&prime;})$ Or ${\tilde{t}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1},T_p^{\&prime;})---\left(14\right),$

${\tilde{f}}_p=\mathrm{mod}(\mathrm{floor}(({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1}\&times;F)/T_p^{\&prime;})+\mathrm{\&Delta;},F)$ Or ${\tilde{f}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+c,F)---\left(15\right).$

The time-frequency domain index sending resource in period p is determined according to formula (5) in embodiment one and formula (6) or formula (7).

If k>1, then UE determines according to formula (14) and formula (15) the logical time-frequency Domain Index sending resource in period p, the time-frequency domain index sending resource in period p is determined according to formula (8) in embodiment one and formula (9) or formula (10), difference is, now 0≤i < k, and the T in formula (9), (10) is replaced with T ' _p, F ' _preplace with F.

If current period p is the one-period after the instruction of UE acquisition initial resource, then UE can determine according to one of the following two kinds mode the time-frequency domain index sending resource:

One, determine according to formula (14) and formula (15) the logical time-frequency Domain Index sending resource in period p with now then, determine according to formula (5) and formula (6) or formula (7) the time-frequency domain index sending resource in period p as k=1, determine according to formula (8) and formula (9) or formula (10) the time-frequency domain index sending resource in period p as k>1, and the T in formula (9), (10) is replaced with T ' _p, F ' _preplace with F;

Two, directly determine according to formula (5) and formula (6) or formula (7) the time-frequency domain index sending resource in period p as k=1, directly determine in period p, to send resource time-frequency domain index according to formula (8) and formula (9) or formula (10) as k>1, wherein and the T in formula (9), (10) is replaced with T ' _p, F ' _preplace with F.

So far, the present embodiment terminates.According to this mode, eNB can find the number of the UE of resource according to current period, and dynamic conditioning resource saltus step scope in time domain, can more effective use Radio Resource.

The above-mentioned sending method specific implementation being D2D discovery signal in the application, present invention also provides the dispensing device that a kind of D2D finds signal, may be used for implementing said method.Fig. 3 is the concrete structure schematic diagram of dispensing device in the application.As shown in Figure 3, this device comprises: resource pool determining unit, transmission resource determining unit and signal transmitting unit.

Wherein, resource pool determining unit, for receiving the signaling that eNB sends, determining the position and the size that send the resource pool DRP finding signal, and indicating to the initial resource allocation of described UE.

Send resource determining unit, for before each period p, determine that resource saltus step scope in respective cycle and D2D find the transmission times k of signal _p; And in each period p, determine to send the logical time-frequency Domain Index that D2D finds signal in this period p according to the resource saltus step scope in this cycle and the instruction of described initial resource allocation, then according to the k in described logical time-frequency Domain Index and respective cycle _p, determine in this period p, to send the time-frequency domain index that D2D finds signal.

Signal transmitting unit, in each period p, time-frequency domain index (t in DRP _p, f _p) resource location that indicates sends D2D find signal.

Wherein, t _pthe index of transmission resource place subframe in DRP of signal is found, f for sending D2D in period p _pthe index of transmission resource place frequency domain resource on whole upstream bandwidth or in described DRP of signal is found for sending D2D in period p.

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

Claims (26)

1. the D2D in LTE network finds a signaling method, it is characterized in that, comprising:

UE receives the signaling that eNB sends, and determines the position and the size that send the resource pool DRP finding signal, and the initial resource allocation instruction of described UE;

Before each period p, described UE determines that resource saltus step scope in respective cycle p and D2D find the transmission times k of signal _p;

In each period p, described UE determines to send the logical time-frequency Domain Index that D2D finds signal in this period p according to the resource saltus step scope in this period p and the instruction of described initial resource allocation, then according to the k in described logical time-frequency Domain Index and respective cycle _p, determine in this period p, to send the time-frequency domain index (t that D2D finds signal _p, f _p), and in described DRP time-frequency domain index (t _p, f _p) resource location that indicates sends described D2D find signal;

Wherein, t _pthe index of transmission resource place subframe in described DRP of signal is found, f for sending D2D in period p _pfor the index of described transmission resource place frequency domain resource on whole upstream bandwidth or in described DRP in period p.

2. method according to claim 1, is characterized in that, described UE determines the k in respective cycle p _pcomprise: before each cycle, described UE receives the instruction that eNB sends, and the k in respective cycle p is carried in this instruction _p; Or UE receives the discovery signal transmission times k of the semi-static instruction of described eNB, using this k as the rhythmic discovery signal transmission times k in this semi-static configuration term of validity _p.

3. method according to claim 1, is characterized in that, described UE determines that the time domain size of the resource saltus step scope in the cycle is identical with the time domain size of described DRP;

Described UE determines the frequency domain size F ' of the resource saltus step scope in respective cycle p _pcomprise:

UE receives the frequency domain size F' of the resource saltus step scope of the semi-static instruction of described eNB, using this F' as the rhythmic frequency domain size F ' in this semi-static configuration term of validity _p; Or,

Before each cycle, described UE receives the instruction that eNB sends, and the F ' in respective cycle p is carried in this instruction _p; Or,

Described UE is according to the k in period p _pcalculate wherein, described T and F is respectively time domain and the frequency domain size of described DRP.

4. method according to claim 1, is characterized in that, described UE determines the frequency domain size F ' of the resource saltus step scope in period p _pidentical with the frequency domain size F of described DRP;

Described UE determines the time domain size T ' of the resource saltus step scope in period p _pcomprise: before each cycle, described UE receives the instruction that eNB sends, and the T ' in respective cycle p is carried in this instruction _p.

5. method according to claim 3, is characterized in that, describedly determines to send in period p Domain Index when D2D finds the logic of signal comprise:

${\tilde{t}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1}\&times;F_p^{\&prime;}+\mathrm{\&Delta;},T)$ Or ${\tilde{t}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1},T);$

The described logical tone Domain Index determining transmission D2D discovery signal in period p comprise:

${\tilde{f}}_p=\mathrm{mod}(\mathrm{floor}(({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1}\&times;F_p^{\&prime;})/T)+\mathrm{\&Delta;},F_p^{\&prime;})$ Or ${\tilde{f}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+c,F_p^{\&prime;}).$

6. method according to claim 4, is characterized in that, describedly determines to send in period p Domain Index when D2D finds the logic of signal comprise:

${\tilde{t}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1}\&times;F+\mathrm{\&Delta;},T_p^{\&prime;})$ Or ${\tilde{t}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1},T_p^{\&prime;});$

The described logical tone Domain Index determining transmission D2D discovery signal in period p comprise:

${\tilde{f}}_p=\mathrm{mod}(\mathrm{floor}(({\tilde{f}}_{p-1}+{\tilde{t}}_{p-1}\&times;F)/T_p^{\&prime;})+\mathrm{\&Delta;},F)$ Or ${\tilde{f}}_p=\mathrm{mod}({\tilde{f}}_{p-1}+c,F).$

7. the method according to claim 5 or 6, is characterized in that, when period p is one-period, ${\tilde{t}}_{p-1}={\tilde{t}}_0,{\tilde{f}}_{p-1}={\tilde{f}}_0,$ Wherein, with be respectively described initial resource allocation and indicate the time-frequency domain index comprised.

8. the method according to claim 3 or 4, is characterized in that, when period p is one-period, wherein, with be respectively described initial resource allocation and indicate the time-frequency domain index comprised.

9. the method according to claim 5 or 6, is characterized in that, works as k _pwhen=1,

Describedly determine to send in period p the time Domain Index t that D2D finds signal _pcomprise:

The described frequency domain index f determining transmission D2D discovery signal in period p _pcomprise:

wherein, f _pthe index of transmission resource place frequency domain resource on whole upstream bandwidth of signal is found, R for sending D2D in period p _pUCCHthe bandwidth of the frequency domain resource at PUCCH transmission and PUCCH protection interval is used for for upstream bandwidth head end and end; Or, wherein, f _pthe index of transmission resource place frequency domain resource on whole upstream bandwidth of signal is found for sending D2D in period p.

10. method according to claim 5, is characterized in that, works as k _pduring >1,

According to restriction relation determine in period p, to send the time Domain Index that D2D finds signal, wherein, $r_p=\mathrm{mod}({\tilde{t}}_p\&times;F_p^{\&prime;}+{\tilde{f}}_p,C_T^{k_p}),$ t _p,ithe index of resource place subframe in DRP is sent for sending for i-th time in period p when D2D finds signal;

Describedly determine that sending D2D in period p finds that the frequency domain index of signal comprises: wherein, f _p,ithe index of resource place frequency domain resource on whole upstream bandwidth is sent for sending for i-th time in period p when D2D finds signal; Or, wherein, f _p,ithe index of resource place frequency domain resource on whole upstream bandwidth is sent for sending for i-th time in period p when D2D finds signal.

11. methods according to claim 4, is characterized in that, work as k _pduring >1,

According to restriction relation determine in period p, to send the time Domain Index that D2D finds signal, wherein, $r_p=\mathrm{mod}({\tilde{t}}_p\&times;F+{\tilde{f}}_p,C_{T_p^{\&prime;}}^{k_p}),$ t _p,ithe index of resource place subframe in DRP is sent for sending for i-th time in period p when D2D finds signal;

Describedly determine that sending D2D in period p finds that the frequency domain index of signal comprises: wherein, f _p,ithe index of resource place frequency domain resource on whole upstream bandwidth is sent for sending for i-th time in period p when D2D finds signal; Or, wherein, f _p,ithe index of resource place frequency domain resource on whole upstream bandwidth is sent for sending for i-th time in period p when D2D finds signal.

12. methods according to claim 3 or 4, is characterized in that, as described F ' _pfor the F ' carried in the instruction that eNB before each cycle sends _ptime, or, as described F ' _pfor according to the k in period p _pcalculate F ' _ptime, if the logical tone Domain Index that described UE sends resource described in period p-1 is greater than F ' _p,

Or, as T ' _pfor the T ' carried in the instruction that eNB before each cycle sends _ptime, if described UE Domain Index when sending the logic of resource described in period p-1 is greater than T ' _p, or, if Domain Index is not more than T ' when sending the logic of resource described in described period p-1 _pand k>1, and UE sends index corresponding to resource in period p-1

Then the method comprises further: described UE again obtained the transmission resource instruction of eNB before described period p;

Describedly determine that sending D2D in period p finds that the logical time-frequency Domain Index of signal comprises: the transmission resource again obtained is indicated the time-frequency domain index comprised by described UE with respectively as the logical time-frequency Domain Index sending resource described in period p-1, for determining the logical time-frequency Domain Index sending resource described in period p, or the transmission resource again obtained is indicated the time-frequency domain index comprised by described UE with directly as the logical time-frequency Domain Index sending resource described in period p; Wherein, k is the discovery signal transmission times of the semi-static instruction of eNB.

13. methods according to claim 3, is characterized in that, described F ' _pfor the F ' of eNB instruction before each period p _ptime, described eNB sends the UE sum N finding signal according to period p _d2Dand/or upstream traffic N in period p _uLdetermine described F ' _p.

14. methods according to claim 13, it is characterized in that, if upstream traffic is higher than upstream traffic in period p-1 in the UE up cache information determination period p that eNB reports according to UE, or eNB is according to the PUSCH error rate be currently received, determine to need to utilize the resource of DRP place subframe to carry out the re-transmission of PUSCH in period p, and resource requirement amount is higher than period p-1, then eNB reduces F ' _pvalue.

15. methods according to claim 13, is characterized in that, F ' _p=min (N _d2D× k/T, F-N _uL), described T and F is respectively time domain and the frequency domain size of described DRP, and k is the discovery signal transmission times of the semi-static instruction of eNB.

16. methods according to claim 4, is characterized in that, described eNB sends the UE sum N finding signal according to period p _d2Dand/or upstream traffic N in period p _uLdetermine described T ' _p.

17. methods according to claim 16, it is characterized in that, if upstream traffic is higher than upstream traffic in period p-1 in the UE up cache information determination period p that eNB reports according to UE, or eNB is according to the PUSCH error rate be currently received, determine to need to utilize the resource of DRP place subframe to carry out the re-transmission of PUSCH in period p, and resource requirement amount is higher than period p-1, then eNB reduces T ' _pvalue.

18. methods according to claim 16, is characterized in that, T ' _p=min (M _d2D× k/F, T-M _uL), described T and F is respectively time domain and the frequency domain size of described DRP, and k is the discovery signal transmission times of the semi-static instruction of eNB.

19. methods according to claim 1, is characterized in that, described UE determines that the time domain size of the resource saltus step scope in the cycle is identical with the time domain size of described DRP;

Described UE determines the frequency domain size F ' of the resource saltus step scope in respective cycle p _pcomprise: wherein, described F is the frequency domain size of described DRP.

20. methods according to claim 19, is characterized in that, describedly to determine in period p that first time sends Domain Index when D2D finds the logic of the transmission resource of signal comprise:

${\tilde{t}}_{p,0}=\mathrm{mod}({\tilde{f}}_{p-1,k_{p-1}-1}+{\tilde{t}}_{p-1,k_{p-1}}\&times;F_p^{\&prime;}+\mathrm{\&Delta;},T)$ Or ${\tilde{t}}_{p,0}=\mathrm{mod}({\tilde{f}}_{p-1,k_{p-1}-1}+{\tilde{t}}_{p-1,k_{p-1}},T);$

The described logical tone Domain Index determining the transmission resource of first time transmission D2D discovery signal in period p comprise:

${\tilde{f}}_{p,0}=\mathrm{mod}(\mathrm{floor}(({\tilde{f}}_{p-1,k_{p-1}-1}+{\tilde{t}}_{p-1,k_{p-1}-1}\&times;F_p^{\&prime;})/T)+\mathrm{\&Delta;},F_p^{\&prime;})$ Or ${\tilde{f}}_{p,0}=\mathrm{mod}({\tilde{f}}_{p-1,k_{p-1}-1}+c,F_p^{\&prime;}).$

21. methods according to claim 20, is characterized in that, when period p is one-period, wherein, with be respectively described initial resource allocation and indicate the time-frequency domain index comprised.

22. methods according to claim 19, is characterized in that, when period p is one-period, wherein, with be respectively described initial resource allocation and indicate the time-frequency domain index comprised.

23. methods according to claim 20,21 or 22, is characterized in that,

Described Domain Index when determining that the jth in period p except first time sends time sends the logic of D2D discovery signal comprise:

${\tilde{t}}_{p,j}=\mathrm{mod}({\tilde{f}}_{p,j-1}+{\tilde{t}}_{p,j-1}\&times;F_p^{\&prime;}+\mathrm{\&Delta;},T)$ Or ${\tilde{t}}_{p,j}=\mathrm{mod}({\tilde{f}}_{p,j-1}+{\tilde{t}}_{p,j-1},T);$

The described logical tone Domain Index determining the interior jth except first time sends of period p time transmission D2D discovery signal comprise:

$\begin{array}{c}{\tilde{f}}_{p,j}=\mathrm{mod}(\mathrm{floor}(({\tilde{f}}_{p,j-1}+{\tilde{t}}_{p,j-1}\&times;F_p^{\&prime;})/T)+\mathrm{\&Delta;},F_p^{\&prime;})+(j-1)\&times;F_p^{\&prime;}\\ {\tilde{f}}_{p,j}=\mathrm{mod}({\tilde{f}}_{p,j-1}+c,F_p^{\&prime;})+(j-1)\&times;F_p^{\&prime;}\end{array}$ Or; Wherein, 0<j<k _p.

24., according to the method described in claim 123, is characterized in that,

Describedly determine to send in period p the time Domain Index t that D2D finds signal _pcomprise:

The described frequency domain index f determining transmission D2D discovery signal in period p _pcomprise:

wherein, f _p,ithe index of resource place frequency domain resource on whole upstream bandwidth is sent, R for sending for i-th time in period p when D2D finds signal _pUCCHthe bandwidth of the frequency domain resource at PUCCH transmission and PUCCH protection interval is used for for upstream bandwidth head end and end; Or, wherein, f _p,ithe index of resource place frequency domain resource on whole upstream bandwidth is sent for sending for i-th time in period p when D2D finds signal.

25. methods according to claim 19, is characterized in that, if the logical tone Domain Index that described UE sends resource in period p-1 is greater than F ' _p, then described UE is determining described F ' _pafter, the method comprises further: described UE obtains the transmission resource instruction of eNB again;

Describedly determine that sending D2D in period p finds that the logical time-frequency Domain Index of signal comprises: the transmission resource again obtained is indicated the time-frequency domain index comprised by described UE with the logical time-frequency Domain Index of the transmission resource of D2D signal is sent, for determining the logical time-frequency Domain Index sending resource in period p for each time respectively as first time in period p-1; Or the transmission resource again obtained is indicated the time-frequency domain index comprised by described UE with the logical time-frequency Domain Index of the transmission resource of D2D signal is directly sent as first time in period p, and according to this with determine the logical time-frequency Domain Index sending the transmission resource of D2D signal in period p for all the other each time.

D2D in 26. 1 kinds of LTE network finds sender unit, it is characterized in that, comprising: resource pool determining unit, transmission resource determining unit and signal transmitting unit;

Described resource pool determining unit, for receiving the signaling that eNB sends, determining the position and the size that send the resource pool DRP finding signal, and indicating to the initial resource allocation of described UE;

Described transmission resource determining unit, for before each period p, determines that resource saltus step scope in respective cycle and D2D find the transmission times k of signal _p; And in each period p, determine to send the logical time-frequency Domain Index that D2D finds signal in this period p according to the resource saltus step scope in this cycle and the instruction of described initial resource allocation, then according to the k in described logical time-frequency Domain Index and respective cycle _p, determine in this period p, to send the time-frequency domain index that D2D finds signal;

Described signal transmitting unit, in each period p, time-frequency domain index (t in described DRP _p, f _p) resource location that indicates sends described D2D find signal;

Wherein, t _pthe index of transmission resource place subframe in described DRP of signal is found, f for sending D2D in period p _pthe index of transmission resource place frequency domain resource on whole upstream bandwidth or in described DRP of signal is found for sending D2D in period p.