CN105472701B

CN105472701B - D2D discovery signal sending method and device in LTE network

Info

Publication number: CN105472701B
Application number: CN201410404511.XA
Authority: CN
Inventors: 张世昌; 李迎阳; 孙程君
Original assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Current assignee: Beijing Samsung Telecommunications Technology Research Co Ltd; Samsung Electronics Co Ltd
Priority date: 2014-07-24
Filing date: 2014-08-15
Publication date: 2020-09-11
Anticipated expiration: 2034-08-15
Also published as: CN111954189A; CN111954189B; CN105472701A

Abstract

The application discloses a method for sending a D2D discovery signal, which comprises the steps of obtaining the position and the size of a DRP (discovery target protocol) by receiving semi-static configuration of an eNB (evolved node B), then determining a resource hopping range and retransmission times of the discovery signal in each period according to the instruction of the eNB, and then determining the resource position for sending a discovery reference signal in each period according to the parameters and a corresponding resource hopping mode. By the method and the device, signaling burden of a wireless network and loss of wireless resources can be reduced.

Description

D2D discovery signal sending method and device in LTE network

Technical Field

The present application relates to the field of mobile communication technologies, and in particular, to a method and an apparatus for sending a D2D discovery signal in an LTE network.

Background

Currently, the D2D (Device to Device) communication technology has been accepted by the 3GPP standard by its great potential value in the public safety field and the general civil communication field, and becomes a candidate evolution direction of the LTE-a (LTE advanced) system.

According to the current 3GPP conclusion, a UE (hereinafter referred to as UE) supporting D2D function will transmit and receive D2D signals in a half-duplex manner, i.e. the UE will not support simultaneous transceiving of D2D signals. When the UE is in a wireless network coverage situation, the D2D communication will only occupy uplink carrier frequencies (FDD system) or uplink subframes (TDD system).

Since the UE operates in the half duplex mode, if a plurality of UEs transmit a Discovery Signal (DS) at the same time, i.e., transmit DS in a frequency multiplexed (FDM) manner, the terminals cannot discover each other.

To solve the half-duplex limitation, the eNB may allocate time-division multiplexing (TDM) resources to the UE that transmits the DS in the FDM manner by multiple scheduling. But this approach will introduce a significant amount of signaling overhead.

Another way is that the eNB semi-statically indicates the location and size of a resource pool (DRP) for sending discovery signals through broadcast messages, where the DRP is a set of resources available for UE to send discovery signals, and each DRP contains T × F Resource Units (RUs), as shown in FIG. 1_pPosition t in time domain of RU transmitting discovery signal in last period relative to UE_p-1Generating f_p-1Wherein f is_p-1A position index in a frequency domain for an RU transmitting a discovery signal for the UE in a last period; at the same time, the frequency domain position f of the RU transmitting the discovery signal at the period p_pWill also be offset with respect to each other by a certain offset f_p-1. The above-mentioned resource hopping procedure is shown in 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) (1)

f_p＝mod(floor((f_p-1+t_p-1× F) T) + Delta, F) or F_p＝mod(f_p-1+c，F) (2)

Where both Δ and c are adjustment factors. In this way, it can be ensured that a plurality of UEs transmitting discovery signals in the same subframe in the period p-1 in a Frequency Division Multiplexing (FDM) manner have different subframe positions in which discovery signals are transmitted in the period p, so that the half-duplex limitation between the UEs can be avoided.

However, this method has a serious drawback that in an actual network, the number of UEs requesting discovery signaling resources (hereinafter referred to as discovery resources) from the eNB in different periods is dynamically changed, however, since the size of the DRP is configured semi-statically, the size of the DRP cannot be adjusted in real time to adapt to the number of resources occupied by the UEs currently participating in the discovery signaling actually. When the number of resources occupied by the UE actually transmitting the discovery signal is smaller than the number of resources included in the DRP, after performing resource hopping according to the formula (1) and the formula (2), the transmission resources of the UE actually transmitting the discovery signal are distributed in the whole DRP range, the unused radio resources in the DRP are divided, and the divided radio resources are difficult to be multiplexed in the LTE system, which eventually results in waste of radio resources.

On the premise of eliminating the half-duplex limitation, there is no mature solution to the problem of how to implement the indication of D2D discovery resources with low signaling overhead and avoid the waste of wireless resources.

Disclosure of Invention

The application provides a method for sending a D2D discovery signal in an LTE network, which can indicate the position of UE sending resources in a flexible mode with low signaling overhead and more efficiently utilize the discovery resources to send the D2D discovery signal.

A D2D discovery signal transmission method in an LTE network, comprising:

the method comprises the steps that UE receives a signaling sent by eNB, and determines the position and the size of a resource pool DRP used for sending a discovery signal and an initial resource allocation indication of the UE;

before each period p, the UE determines a resource hopping range and the number k of transmissions of D2D discovery signals within the corresponding period p_p；

In each period p, the UE determines to transmit a D2D discovery signal in the period p according to the resource hopping range in the period p and the initial resource allocation indicationAccording to the logical time-frequency domain index and k in the corresponding period_pDetermining the time-frequency domain index (t) of the transmitted D2D discovery signal within the period p_p,f_p) And time-frequency domain index (t) in the DRP_p,f_p) Transmitting the D2D discovery signal on the indicated resource location;

wherein, t_pIndex in the DRP for subframe where transmission resource for transmitting D2D discovery signal in period p is located, f_pThe index of the frequency domain resource where the transmission resource is located in the period p on the whole uplink bandwidth or in the DRP.

Preferably, the UE determines k within the corresponding period p_pThe method comprises the following steps: before each period, the UE receives an instruction sent by the eNB, and the instruction carries k in a corresponding period p_p(ii) a Or, the UE receives the number k of discovery signal transmissions indicated by the eNB in the semi-static state, and takes the k as the number k of discovery signal transmissions of all periods within the validity period of the semi-static configuration_p。

Preferably, the UE determines that a time domain size of a resource hopping range within a period is the same as a time domain size of the DRP;

the UE determines the frequency domain size F 'of the resource hopping range in the corresponding period p'_pThe method comprises the following steps:

the UE receives the frequency domain size F 'of the resource hopping range indicated by the eNB in the semi-static state, and takes the F' as the frequency domain size F 'of all periods in the validity period of the semi-static configuration'_p(ii) a Or,

before each period, the UE receives an instruction sent by the eNB, and the instruction carries F 'in the corresponding period p'_p(ii) a Or,

the UE according to k in the period p_pComputing

Wherein, T and F are the time domain and frequency domain size of the DRP, respectively.

Preferably, the UE determines the frequency domain size F 'of the resource hopping range within the period p'_pThe same as the frequency domain size F of the DRP;

the UE determines the time domain size T 'of the resource hopping range in the period p'_pThe method comprises the following steps: before each period, the UE receives an instruction sent by the eNB, wherein the instruction carries T 'in the corresponding period p'_p。

Preferably, the logical time domain index of the D2D discovery signal is transmitted within the determination period p

The method comprises the following steps:

or

Logical frequency domain index for transmitting D2D discovery signal within the determination period p

The method comprises the following steps:

or

The method comprises the following steps:

or

The method comprises the following steps:

or

Preferably, when the period p is the first period,

wherein the sums are respectively time-frequency domain indexes included in the initial resource allocation indication.

Preferably, when the period p is the first period,

wherein,

and

and respectively allocating the time-frequency domain indexes included in the initial resource allocation indication.

Preferably, when k is_pWhen the number is equal to 1, the alloy is put into a container,

time domain index t of D2D discovery signal transmitted in the determined period p_pThe method comprises the following steps:

frequency domain index f of the transmitted D2D discovery signal within the determination period p_pThe method comprises the following steps:

wherein f is_pIndex R of frequency domain resource of transmission resource for transmitting D2D discovery signal in period p on whole uplink bandwidth_PUCCHThe bandwidth of the frequency domain resource used for PUCCH transmission and PUCCH guard interval for the head end and the tail end of the uplink bandwidth; or,

wherein f is_pThe index of the frequency domain resource where the transmission resource for transmitting the D2D discovery signal in the period p is located on the whole uplink bandwidth.

Preferably, when k is_p>When the pressure of the mixture is 1, the pressure is lower,

the time domain index of the transmitted D2D discovery signal within period p is determined according to a constraint relationship, wherein,

t_p,ian index of a subframe in which a transmission resource is located in a DRP when a D2D discovery signal is transmitted for the ith time in a period p;

the determining the frequency domain index of the D2D discovery signal transmitted within the period p comprises:

wherein f is_p,iIndex of frequency domain resource where transmission resource is located on the whole uplink bandwidth when the discovery signal of D2D is transmitted for the ith time in the period p; or,

wherein f is_p,iThe index of the frequency domain resource where the transmission resource is located on the whole uplink bandwidth is the ith time when the D2D discovery signal is transmitted in the period p.

wherein f is_p,iIs the ith sending D2D sending in the period pSending indexes of frequency domain resources where the resources are located on the whole uplink bandwidth when the signals are transmitted; or,

Preferably, when the F'_pIs F 'carried in the instruction sent by the eNB before each cycle'_pOr, when F'_pAccording to k in the period p_pCalculating F'_pIf the UE is in the period p-1, the logical frequency domain index of the transmission resource is greater than F'_p，

Or, when T'_pIs T 'carried in the instruction sent by the eNB before each cycle'_pIf the logical time domain index of the sending resource of the UE in the period p-1 is more than T'_pOr, if the logical time domain index of the transmission resource in the period p-1 is not greater than T'_pAnd k is>1, and the UE transmits the index corresponding to the resource in the period p-1

The method further comprises: the UE reacquires the transmission resource indication of the eNB before the period p;

the determining the logical time-frequency domain index of the D2D discovery signal transmitted within the period p includes: the UE indexes the time-frequency domain included in the reacquired transmission resource indication

And

respectively as the logical time-frequency domain index of the transmission resource in the period p-1, for determining the logical time-frequency domain index of the transmission resource in the period p, or the time-frequency domain index included in the transmission resource indication to be reacquired by the UE

And

directly as the logical time-frequency domain index of the transmission resource in the period p; wherein,

k is the number of discovery signal transmissions semi-statically indicated by the eNB.

Preferably, the F'_pF 'indicated by p front eNB per cycle'_pThen, the eNB sends the total number N of the UEs sending the discovery signals according to the period p_D2DAnd/or uplink traffic N in period p_ULDetermining the F'_p。

Preferably, if the eNB determines that the uplink traffic volume in the period p is higher than the uplink traffic volume in the period p-1 according to the UE uplink cache information reported by the UE, or the eNB determines that the resource of the subframe where the DRP is located needs to be used for retransmission of the PUSCH in the period p according to the currently received PUSCH error rate, and the required resource volume is higher than the period p-1, the eNB reduces F'_pThe value of (c).

Preferably, F'_p＝min(N_D2D×k/T,F-N_UL) T and F are the time domain and frequency domain size of the DRP, respectively, and k is the number of times of sending the discovery signal indicated by the eNB in the semi-static state.

Preferably, the eNB sends the total number N of the UEs sending the discovery signal according to the period p_D2DAnd/or uplink traffic N in period p_ULDetermining the T'_p。

Preferably, if the eNB determines that the uplink traffic volume in the period p is higher than the uplink traffic volume in the period p-1 according to the UE uplink cache information reported by the UE, or the eNB determines that the resource of the subframe where the DRP is located needs to be used for retransmission of the PUSCH in the period p according to the currently received PUSCH error rate, and the required resource volume is higher than the period p-1, the eNB reduces T'_pThe value of (c).

Preferably, T'_p＝min(M_D2D×k/F,T-M_UL) T and F are respectively the time domain and frequency domain of the DRP, and k is eNBA number of discovery signal transmissions indicated semi-statically.

wherein, the F is the frequency domain size of the DRP.

Preferably, the logical time domain index of the transmission resource for transmitting the D2D discovery signal for the first time within the determination period p

The method comprises the following steps:

or

Logical frequency domain index of transmission resource for first transmitting D2D discovery signal within the determination period p

The method comprises the following steps:

or

Preferably, when the period p is the first period,

wherein,

and

Preferably, when the period p is the first period,

wherein,

and

Preferably, the logical time domain index of the j-th transmission D2D discovery signal within the determination period p is different from the first transmission

The method comprises the following steps:

or

Logical frequency domain index of j-th transmission D2D discovery signal within the determination period p except for the first transmission

The method comprises the following steps:

or; wherein, 0<j<k_p。

Preferably, the time domain index t of the D2D discovery signal is transmitted within the determination period p_pThe method comprises the following steps:

wherein f is_p,iIndex R of frequency domain resource of transmission resource on whole uplink bandwidth when I time of sending D2D discovery signal in period p_PUCCHThe bandwidth of the frequency domain resource used for PUCCH transmission and PUCCH guard interval for the head end and the tail end of the uplink bandwidth; or,

Preferably, if the logical frequency domain index of the UE transmitting resources in the period p-1 is greater than F'_pThen the UE is determining the F'_pThereafter, the method further comprises: the UE acquires the transmission resource indication of the eNB again;

And

the logical time-frequency domain indexes are respectively used as the logical time-frequency domain indexes of the sending resources for sending the D2D signal for the first time in the period p-1 and are used for determining the logical time-frequency domain indexes of the sending resources for each time in the period p; or, the UE may reacquire the time-frequency domain index included in the transmission resource indication

And

directly as the first transmission of the D2D signal in period pLogical time-frequency domain index of resources and based thereon

And

the logical time-frequency domain index of the transmission resource for transmitting the D2D signal for the remaining times in the period p is determined.

A D2D discovery signal transmitting device in an LTE network, comprising: a resource pool determining unit, a sending resource determining unit and a signal sending unit;

the resource pool determining unit is configured to receive a signaling sent by an eNB, determine a location and a size of a resource pool DRP used for sending a discovery signal, and send an initial resource allocation indication to the UE;

the transmission resource determining unit is used for determining the resource hopping range and the number k of times of transmitting the D2D discovery signal in the corresponding period before each period p_p(ii) a And determining a logic time-frequency domain index of the D2D discovery signal sent in each period p according to the resource hopping range in the period and the initial resource allocation indication, and then determining a logic time-frequency domain index according to the logic time-frequency domain index and k in the corresponding period_pDetermining the time-frequency domain index of the D2D discovery signal transmitted in the period p;

the signal transmitting unit is used for indexing a time-frequency domain in the DRP (t) in each period p_p,f_p) Transmitting the D2D discovery signal on the indicated resource location;

wherein, t_pIndex in the DRP for subframe where transmission resource for transmitting D2D discovery signal in period p is located, f_pAnd the index of the frequency domain resource where the transmission resource for transmitting the D2D discovery signal in the period p is located on the whole uplink bandwidth or in the DRP.

According to the technical scheme, the UE obtains the position and the size of the DRP by receiving the semi-static configuration of the eNB, then determines the resource hopping range and the retransmission times of the discovery signal in each period according to the instruction of the eNB, and then determines the resource position for sending the discovery reference signal in each period according to the parameters and the corresponding resource hopping mode. According to different implementation schemes of the method, complete collision of discovery signals of different UE can be avoided only by coordination of a small amount of wireless network signaling, mutual discovery between any two UEs in a group is realized in a short time, and signaling burden of a wireless network and loss of wireless resources are reduced to the maximum extent. In addition, the scheme provided by the application has the advantages that the change of the existing system is small, the compatibility of the system cannot be influenced, and the implementation is simple and efficient.

Drawings

FIG. 1 is a schematic diagram of a DRP structure;

fig. 2 is a general flowchart illustrating a method for transmitting a D2D discovery signal according to the present application;

fig. 3 is a schematic diagram of a basic structure of a D2D discovery signal sending apparatus in the present application.

Detailed Description

For the purpose of making the objects, technical means and advantages of the present application more apparent, the present application will be described in further detail with reference to the accompanying drawings.

In the following description, unless otherwise specified, the mutual discovery is for UEs within one D2D group, UEs within the D2D group are in time-frequency synchronization state, or synchronization error is within UE receiver tolerance.

The application mainly aims at the mutual discovery process of the UE in D2D communication. The mutual discovery of UEs is a precondition for D2D communication, while according to the prior art, one possible solution is to implement the mutual discovery of UEs through coordination of wireless network signaling, which will seriously increase the signaling burden of the wireless network. Another possible scheme is that the UE determines the time-frequency domain index of the transmission resource in the current period based on the time-frequency domain index of the transmission resource in the previous period in a certain resource hopping manner according to the semi-statically configured DRP size of the eNB. However, this method will cause serious radio resource waste when the number of resources occupied by the UE actually participating in discovery signal transmission is less than the total number of DRP resources.

In order to solve the above problem, an embodiment of the present application provides a method for transmitting a D2D discovery signal, as shown in fig. 2, including the following steps:

step 210: and the UE receives the signaling sent by the eNB to obtain the semi-statically configured DRP position and size and the initial resource allocation indication.

The signaling sent by the eNB may be RRC signaling or other signaling, and the RRC signaling may be broadcast messages and UE-specific RRC signaling, and may include multiple RRC messages.

Wherein the position of the DRP includes a time domain position and a frequency domain position of the RUs included in the DRP, and the size of the DRP refers to the number T of RUs included in the DRP in the time domain and the number F of RUs included in the frequency domain.

The initial resource allocation indication refers to signaling obtained by the UE from the eNB about discovery resource allocation after the UE initiates a discovery resource request to the eNB. The UE determines the first discovery period and the location of the discovery resource in each subsequent discovery period according to the indication information.

Step 220: before the period p, the UE determines a resource hopping range in the period p, and determines the number k of times of sending the discovery signal in the period p.

The resource hopping range may be the same size as the DRP for the period p and remain unchanged for multiple periods. Or a subset of DRP, and may change in each period, in which case the UE needs to receive signaling from the eNB before period p to determine the resource hopping range in period p.

The number k of transmissions of the discovery signal within the period p is an integer not less than 1. The value of k may remain unchanged for a plurality of periods, in which case the UE determines the number of discovery signal transmissions for the plurality of periods by receiving semi-static signaling of the eNB. Alternatively, the value of k may change with period, in which case the UE needs to receive the signaling of the eNB before period p to determine the value of k in period p.

Step 230: the UE determines a location to transmit the discovery signal within the period p according to the information obtained in

steps

210 and 220, and transmits the discovery signal.

In each period p, the UE determines a logical time-frequency domain index of the D2D discovery signal sent in the period p according to the resource hopping range and the initial resource allocation indication in the period p, and then determines a logical time-frequency domain index according to the logical time-frequency domain index and the corresponding periodThe number of transmissions in the period p, and the time-frequency domain index (t) of the D2D discovery signal transmitted in the period p_p,f_p) And the time-frequency domain index (t) in the DRP determined in step 210_p,f_p) The D2D discovery signal is transmitted on the indicated resource location.

In order to facilitate understanding of the present application, the following further describes the above technical solution of the present application with reference to specific application cases as follows:

the first embodiment is as follows:

in this embodiment, the eNB semi-statically configures the location of the DRP, the time domain size T, and the frequency domain size F through signaling. Meanwhile, the eNB semi-statically indicates the resource hopping range. The number of transmissions of the discovery signal may vary within each discovery period. The UE sends times k according to the parameters and the discovery signal of the current period_pDetermining the sending position of the discovery signal in the period p, which comprises the following specific steps:

step 310: and the UE receives the signaling of the eNB, and obtains the position, the time domain size T and the frequency domain size F of the DRP, the resource hopping range and the initial resource indication.

The frequency domain size F of the DRP may be indicated in a direct or indirect way. If the method is a direct mode, the eNB directly informs the UE of the starting position and the ending position of the frequency domain resource occupied by the DRP in the DRP subframe DRP through signaling. If the method is indirect, the eNB indicates R through signaling_PUCCH，R_PUCCHFrequency domain resources including upstream bandwidth head end and tail end for PUCCH transmission and PUCCH guard interval, which cannot be used for D2D discovery signal transmission, and upstream system bandwidth inner dividing R_PUCCHIndicating other bandwidth resources except the resource to constitute the DRP, the frequency domain size F of the DRP is equal to B_w-2×R_PUCCHIn which B is_wIs the uplink system bandwidth.

In this embodiment, the time domain size of the resource hopping range is equal to DRP, and the frequency domain size F' of the resource hopping range is less than or equal to F. The resource hopping range is configured to the UE semi-statically by the base station, and the specific manner in which the base station determines the resource hopping range is not limited in this application.

The signaling for indicating the initial resource is UE specific signaling, and the UE determines the initial resource through the initial resource indicationLogical time-frequency domain location of original sending resource

And

step 320: UE receives eNB signaling and determines the number k of times of sending discovery signals of a period p_p。

The signaling is common signaling and should be directed to all UEs participating in discovery signal transmission and reception in the cell.

Step 330: the UE determines the resource location for transmitting the discovery signal in the period p and transmits the discovery signal.

If k is_pIf 1, the UE determines the logical time-frequency domain index of the transmission resource in the period p according to the following formula:

or

Or

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

or,

wherein t is_pF in equation (6) for the index of the subframe in which the transmission resource is located within the DRP_pFor the index of the frequency domain resource where the transmission resource is located on the whole uplink bandwidth, f in formula (7)_pIs the index of the frequency domain resource where the transmission resource is located in the DRP. The index of the frequency domain resource can be determined by adopting formula (6) or (7) according to actual conditions. For example, when the base station directly transmits the frequency domain size F of the DRP to the UE in step 310, the UE may determine the frequency domain index by equation (7); when the base station transmits only the resource R in step 310_PUCCHWhen notified to the UE, the UE may determine the frequency domain index using equation (6). Here, since k is_p1, therefore, only one time-frequency domain index of the transmission resource needs to be determined in the period p, using t_pAnd f_pAnd (4) showing.

If k is_p>1, the UE determines a logical time-frequency domain index of the transmission resource in the period p according to the formula (3) and the formula (4), and the time-frequency domain index of the transmission resource in the period p is determined by the following formula:

or,

wherein,

firstly, determining the time domain index t of each transmission resource in the period p according to the constraint relation of the formula (8)_p,iThen, the frequency domain index of each transmission resource in the period p is determined according to the formula (9) or (10). t is t_p,iIs the index of the sub-frame in which the transmission resource is located in the DRP when the discovery signal is transmitted for the ith time in the period p, f in the formula (9)_p,iIs the ith in period pIndex of frequency domain resource where transmission resource is located on the entire uplink bandwidth when the discovery signal is transmitted next time, f in formula (10)_pIs the index of the frequency domain resource where the transmission resource is located in the DRP. The index of the frequency domain resource can be determined by adopting the formula (9) or (10) calculation according to the actual situation. For example, when the base station directly transmits the frequency domain size F and the start position of the DRP to the UE in step 310, the UE may determine the frequency domain index by using equation (10); when the base station transmits only the resource R in step 310_PUCCHWhen notified to the UE, the UE may determine the frequency domain index using equation (9). Here, since k is_p>1, therefore, the time-frequency domain index of a plurality of transmission resources needs to be determined in the period p, using t_p,iAnd f_p,iAnd (4) showing.

In the above formulas (8), (9) and (10), when

Then, the above formula is simplified as:

wherein,

t_p,i is the index of the sub-frame in DRP where the transmission resource is located when the discovery signal is transmitted for the ith time in the period p, and f in the formula (12)_p,iFor the index of the frequency domain resource where the transmission resource is located on the whole uplink bandwidth when the discovery signal is transmitted for the ith time in the period p, f in the formula (13)_p,iThe index of the frequency domain resource where the transmission resource is located on the DRP is the ith time of transmitting the discovery signal in the period p.

If the current period p is the first period after the UE obtains the initial resource indication, the UE may determine the time-frequency domain index of the transmission resource according to one of the following two ways:

firstly, determining the logical time-frequency domain index of the transmission resource in the period p according to the formula (3) and the formula (4) and determining the index of the transmission resource in the period p at the moment

Then, when k is_pDetermining a time-frequency domain index of transmission resources within a period p according to equation (5) and equation (6) or equation (7) when k is 1_p>Determining the time-frequency domain index of the transmission resource in the period p according to a formula (8), a formula (9) or a formula (10) at 1 time;

two, when k_pDetermining the time-frequency domain index of the transmission resource in the period p directly according to formula (5) and formula (6) or formula (7) when k is 1_p>The time-frequency domain index of the transmission resource in the period p is determined by 1 hour directly according to the formula (8) and the formula (9) or the formula (10), wherein,

this embodiment ends by this. In this way, the eNB may semi-statically configure the DRP capable of supporting the maximum number of users and the maximum number of transmissions, and the used resources are centralized under different numbers of transmissions of the discovery signal, so as to avoid the generation of resource fragments. And when the sending times k is more than 1, the method can ensure

The transmission resources are not completely overlapped in time domain, so that the half-duplex limitation between the UEs can be avoided. The proposal of the embodiment is to ensure

On the premise that the transmission resources of the UEs are not completely overlapped in the time domain, the number of required subframes is relatively less, which can effectively reduce the influence of the D2D discovery signal on the cellular network signal, and can reduce the waste of radio resources at the same time.

Example two:

in this embodiment, the eNB passes signalingThe location sum of the DRP is semi-statically configured, as well as the time domain size T and the frequency domain size F. Before each discovery period, the eNB dynamically indicates a resource hopping range. In this embodiment, the time domain size of the resource hopping range is equal to DRP, and the frequency domain size is F'_pF is less than or equal to F. The UE determines the sending position of the discovery signal in the period p according to the parameters and the resource hopping range of the current period, and the specific steps are as follows:

step 410: the UE receives the signaling of the eNB, and obtains the position of the DRP, the sending times k of the discovery signal, the time domain size T and the frequency domain size F, and the initial resource indication.

As in the first embodiment, the frequency domain size F of the DRP may be indicated directly or indirectly. If the method is a direct mode, the eNB directly informs the UE of the starting position and the ending position of the frequency domain resource occupied by the DRP in the DRP subframe DRP through signaling. If the method is indirect, the eNB indicates R through signaling_PUCCH，R_PUCCHIncluding the frequency domain resources at the head end or the tail end of the uplink bandwidth for PUCCH transmission and PUCCH guard interval, which cannot be used for D2D discovery signal transmission, the frequency domain size F ═ B of DRP_w-2×R_PUCCHIn which B is_wIs the uplink system bandwidth.

The signaling for indicating the initial resource is UE specific signaling, and the UE determines the logic time-frequency domain position of the initial transmission resource through the initial resource indication

And

in addition, in this embodiment, the number of times of sending the discovery signal per cycle is the same, and is denoted by k, where k is configured by the eNB to the UE in a semi-static manner.

Step 420: and the UE receives the eNB signaling before the period p and determines the resource hopping range of the period p.

The signaling for indicating the resource hopping range is a common signaling, and is intended for all UEs participating in discovery signal transmission and reception in a cell. In this embodiment, the time domain size of the resource hopping range is equal to DRP, and the frequency domain size is F'_p≤F。

Value and F 'of resource hopping range indication information in signaling'_pThe values can directly correspond to each other, for example, the value of the resource hopping range indication information bit field is v, and the value of the field is F'_pValue of (2), i.e. F'_pV; or the DRP is divided into multiple segments in the frequency domain, the value of the resource hopping range indicator indicates the number of segments of the resource used for resource hopping, for example, the value of the resource hopping range indicator bit field is v, and the size of each segment after DRP segmentation is s, then F'_p＝s×v。

F′_pThe value of (a) is determined by the eNB. According to one method of the present application, the eNB determines F 'according to the total number of UEs that need to transmit discovery signals in period p'_pFor example, if the total number of UEs required to transmit discovery signals in period p is F × T/2, the eNB may adjust the value of v to F'_pSet to F/2. According to another method of the present application, the eNB adjusts F 'according to uplink traffic (PUSCH transmission) within a period p'_pThe value of (c). For example, if the eNB determines that the uplink traffic volume in the period p is higher than the uplink traffic volume in the period p-1 according to the UE uplink cache information reported by the UE, or the eNB determines that the resource of the subframe where the DRP is located needs to be used for retransmission of the PUSCH in the period p according to the currently received PUSCH error rate, and the required resource volume is higher than the period p-1, the eNB reduces F 'according to the information'_pIn order to meet the requirements of PUSCH transmission.

According to a third method of the present application, the eNB determines F 'comprehensively according to the two factors, i.e., the total number of UEs that need to transmit discovery signals in the period p and the uplink traffic in the period p'_pValue of (2), i.e. F'_p＝(N_D2D,N_UL) In which N is_D2DIndicating the total number of UEs required to transmit discovery signals in period p, N_ULRepresents the resources needed by the uplink service in the period p, and the value is estimated by the eNB as the resources N needed by the PUSCH retransmission on each subframe in the period p_rAnd resource N required by PUSCH new transmission on each average subframe_nObtaining weights, e.g.

Represents N_D2DAnd N_ULTo F'_pOf (2), e.g. F'_p＝min(N_D2D×k/T,F-N_UL)。

Since the resource hopping range may be different in each period, the logical frequency domain index determined according to the resource hopping range of the previous period may exceed the resource hopping range of the current period, and therefore, in the above case, a new resource indication needs to be obtained for the calculation of the transmission resources of the current period and each period thereafter. Specifically, the method comprises the following steps:

if the logical frequency domain index of the resource transmitted by the UE in the period p-1 is greater than F'_pThen the eNB should reallocate the transmission resource for the UE before the period p, i.e. the UE needs to reacquire the transmission resource indication of the eNB. If the UE does not successfully detect the transmission resource indication re-issued by the eNB before the period p, the UE may perform an operation according to actual requirements, for example, abandon the transmission resource calculation of the current period p; if the UE successfully detects the transmission resource indication retransmitted by the eNB before the period p (it needs to be specially indicated that the transmission resource indication signaling retransmitted by the eNB and detected by the UE can indicate F'_pBefore or after the signaling of (c), the same applies below), and the resource time-frequency domain index is

And

the UE may calculate the time-frequency domain index of the transmission resource of the period p in one of the following two ways:

step 430 is executed to determine the logical time-frequency domain index sum and the time-frequency domain index of the transmission resource in the period p, at this time

Secondly, when k is 1, the UE determines the time-frequency domain index of the transmission resource in the period p according to the formula (5) and the formula (6) or the formula (7), and when k is 1>Determining the time-frequency domain index of the transmission resource in the period p according to the formula (8) and the formula (9) or the formula (10) when 1 hour is carried out, wherein at the moment

And replacing F 'in formulas (9) and (10) with F'_p。

If the logical frequency domain index of the UE transmitting resources in the period p-1 is not more than F'_pThe UE directly performs step 430.

Step 430: the UE determines the resource location for transmitting the discovery signal in the period p and transmits the discovery signal.

When k is 1, the UE determines the logical time-frequency domain index of the transmission resource in the period p according to the following formula:

or

Or

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

If k is>1, the UE determines the logical time-frequency domain index of the transmission resource in the period p according to the formula (14) and the formula (15), and the time-frequency domain index of the transmission resource in the period p is determined according to the formula (8) and the formula (9) or the formula (10) in the first embodiment, except that, at this time, the logical time-frequency domain index of the transmission resource in the period p is determined according to the formula (8) and the formula (9) or the

0 is more than or equal to i < k, and F 'in formulas (9) and (10) is replaced by F'_p。

according to formula (14) and formula(15) Determining logical time-frequency domain index of transmission resource in period p

And

at this time

Then, a time-frequency domain index of the transmission resource within the period p is determined according to equation (5) and equation (6) or equation (7) when k is 1, and when k is 1>Determining the time-frequency domain index of the transmission resource in the period p according to formula (8) and formula (9) or formula (10) at time 1, and replacing F 'in formulas (9) and (10) with F'_p；

Secondly, when k is 1, the time-frequency domain index of the transmission resource in the period p is directly determined according to the formula (5) and the formula (6) or the formula (7), and when k is 1>The time-frequency domain index of the transmission resource in the period p is directly determined according to the formula (8) and the formula (9) or the formula (10) in 1 hour, wherein,

and replacing F 'in formulas (9) and (10) with F'_p。

This embodiment ends by this. According to the mode, the eNB can dynamically adjust the resource hopping range on the frequency domain according to the number of the UE applying for discovering the resources at present, and can use the wireless resources more effectively.

Example three:

in this embodiment, the eNB semi-statically configures the location and time domain size T of the DRP and the frequency domain size F of the DRP through signaling. The number of transmissions of the discovery signal may vary within each discovery period. The UE sends times k according to the parameters and the discovery signal of the current period_pDetermining the sending position of the discovery signal in the period p, which comprises the following specific steps:

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

The frequency domain size F of the DRP can be the same as the first embodimentIndicated in a direct or indirect manner. If the method is a direct mode, the eNB directly informs the UE of the starting position and the ending position of the frequency domain resource occupied by the DRP in the DRP subframe DRP through signaling. If the method is indirect, the eNB indicates R through signaling_PUCCH，R_PUCCHIncluding the frequency domain resources at the head end or the tail end of the uplink bandwidth for PUCCH transmission and PUCCH guard interval, which cannot be used for D2D discovery signal transmission, the frequency domain size F ═ B of DRP_w-2×R_PUCCHIn which B is_wIs the uplink system bandwidth.

And

step 520: UE receives eNB signaling and determines the number k of times of sending discovery signals of a period p_pAnd further determining the frequency domain size of the resource hopping range in the period p.

Above for indicating k_pThe signaling of (2) is common signaling, and should be directed to all UEs participating in discovery signal transmission and reception in the cell. The time domain size of the resource hopping range is the same as the time domain size of the DRP, and the frequency domain size is F'_pAnd k_pThe following constraint relationships are satisfied:

due to the resource jump range and the number k of transmission times_pThe resource hopping ranges may be different in each period, and therefore, the logical frequency domain index determined according to the resource hopping range of the previous period may exceed the resource hopping range of the current period, and therefore, a new resource indication needs to be obtained for calculating the transmission resources of the current period and each period thereafter. Specifically, the method comprises the following steps:

if the logical frequency domain index of the resource transmitted by the UE in the period p-1 is greater than F'_pThen eNBThe UE should be re-allocated with transmission resources before the period p, i.e. the UE needs to re-acquire the transmission resource indication of the eNB. If the UE does not successfully detect the transmission resource indication re-issued by the eNB before the period p, the UE may perform an operation according to actual requirements, for example, abandon the transmission resource calculation of the current period p; if the UE successfully detects the sending resource indication retransmitted by the eNB before the period p, and the resource time-frequency domain index is

And

first, step 530 is executed to determine the logical time-frequency domain index of the transmission resource when the discovery signal is transmitted each time in the period p

And

and a time-frequency domain index, at which time

Secondly, the UE determines the time-frequency domain index of the transmission resource in the period p directly according to the formula (5), the formula (6) or the formula (7), and at the moment

And

determined according to the formulas (18) and (19), and t in the formulas (5), (6) and (7)_p、

f_pAnd

are respectively replaced by t_p,i、

fp, i and

step 530: the UE determines the resource location for transmitting the discovery signal in the period p and transmits the discovery signal.

The UE determines the logical time-frequency domain index of the first transmission resource in the period p according to the following formula:

or

(16)，

Or

(17)。

The UE determines a transmission resource logic time-frequency domain index used for repeatedly transmitting the discovery signal in the period p according to the following formula:

or

Or (19).

Wherein 0<j<k_p(ii) a The time-frequency domain index of the transmission resource in the period p is determined according to formula (5) and formula (6) or formula (7) in the first embodiment, and t in the corresponding formula_p、

fp and

are respectively replaced by t_p,i、

f_p,iAnd

wherein i is more than or equal to 0<k_p。

firstly, determining the logical time-frequency domain index and the time-frequency domain index of each transmission resource in the period p according to the formulas (16) to (19), then determining the time-frequency domain index of the transmission resource in the period p according to the formula (5), the formula (6) or the formula (7), and using F 'and t' in the corresponding formulas_pFp and respectively replace

And

secondly, determining the time-frequency domain index of the transmission resource in the period p directly according to the formula (5), the formula (6) or the formula (7), wherein the time-frequency domain index of the transmission resource in the period p is determined at the moment

And

fp and

respectively replace t_p,i、

f_p,iAnd

this embodiment ends by this. According to the mode, the eNB can dynamically adjust the sending times of the discovery signals according to the number of the UE applying for discovering resources at present, and the wireless resources in the DRP are fully utilized. Compared with the first embodiment, for different transmission times, the transmission resource of the UE can be determined by adopting a uniform resource hopping method, which is relatively simple to implement, but requires F'_pT, otherwise multiple transmission resources of the discovery signal of one UE may occur in the same subframe, which limits the application range of the scheme to some extent.

Example four:

in this embodiment, the eNB semi-statically configures the location of the DRP, the time domain size T, and the frequency domain size F through signaling. Meanwhile, the number of times of sending the discovery signal in each discovery period may change, and the resource hopping range will also change accordingly. The UE sends times k according to the parameters and the discovery signal of the current period_pDetermining the sending position of the discovery signal in the period p, which comprises the following specific steps:

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

The above signaling for indicating initial resources is UE-specificSignaling, UE determining the logical time-frequency domain location of the initial transmission resource by the initial resource indication

And

step 620: UE receives eNB signaling and determines the number k of times of sending discovery signals of a period p_pAnd further determining the frequency domain size F 'of the resource hopping range'_p。

The signaling is common signaling and should be directed to all UEs participating in discovery signal transmission and reception in the cell. Wherein the time domain size of the resource hopping range is the same as the time domain size of the DRP, and the frequency domain size is F'_pAnd k_pThe following constraint relationships are satisfied:

if the logical frequency domain index of the resource transmitted by the UE in the period p-1 is greater than F'_pThen the eNB should reallocate the transmission resource for the UE before the period p, i.e. the UE needs to reacquire the transmission resource indication of the eNB. If the UE does not successfully detect the transmission resource indication re-issued by the eNB before the period p, the UE may perform an operation according to actual requirements, for example, abandon the transmission resource calculation of the current period p; if the UE successfully detects the sending resource indication retransmitted by the eNB before the period p, and the resource time-frequency domain index is

And

step 630 is executed to determine the logical time-frequency domain index sum and the time-frequency domain index of the transmission resource in the period p, at this time

Two, when k_pWhen the resource is 1, the UE determines the time-frequency domain index of the transmission resource in the period p according to the formula (5) and the formula (6) or the formula (7), and when k is_p>Determining the time-frequency domain index of the transmission resource in the period p according to the formula (8) and the formula (9) or the formula (10) when 1 hour is carried out, wherein at the moment

And replacing F 'in formulas (9) and (10) with F'_p。

Step 630: the UE determines the resource location for transmitting the discovery signal in the period p and transmits the discovery signal.

If k is_pThe UE determines the logical time-frequency-domain index of the transmission resource in the period p according to formula (14) and formula (15) in the second embodiment, and further determines the time-frequency-domain index of the transmission resource in the period p according to formula (5) and formula (6) or formula (7) in the first embodiment.

If k is_p>1, the UE determines the logical time-frequency domain index of the transmission resource in the period p according to the formula (14) and the formula (15) in the second embodiment, and the time-frequency domain index of the transmission resource in the period p is determined according to the formula (8) and the formula (9) or the formula (10) in the first embodiment, except that, at this time, the UE determines the logical time-frequency domain index of the transmission resource in the period p according to the formula (14) and the formula (15)

And replacing F 'in formulas (9) and (10) with F'_p。

firstly, according to formula (14) and formula (15)Logical time-frequency domain index of transmission resource within fixed period p

And

at this time

Then, when k is_pDetermining a time-frequency domain index of transmission resources within a period p according to equation (5) and equation (6) or equation (7) when k is 1_p>Determining the time-frequency domain index of the transmission resource in the period p according to formula (8) and formula (9) or formula (10) at time 1, and replacing F 'in formulas (9) and (10) with F'_p；

Two, when k_pDetermining the time-frequency domain index of the transmission resource in the period p directly according to formula (5) and formula (6) or formula (7) when k is 1_p>The time-frequency domain index of the transmission resource in the period p is directly determined according to the formula (8) and the formula (9) or the formula (10) in 1 hour, wherein,

and replacing F 'in formulas (9) and (10) with F'_p。

This embodiment ends by this. In this way, the eNB may dynamically change the number of times of sending the discovery signal according to the current network environment and the number of users applying for the discovery resource. And when the sending times k is more than 1, the method can ensure

The transmission resources of the UEs do not completely overlap in the time domain, so that the half-duplex limitation between the UEs can be avoided. Compared with the first embodiment, the resource hopping range can be dynamically adjusted along with the number of users which can be currently supported, so that the complexity of implementation is favorably reduced.

Example five:

in this embodiment, the eNB semi-statically configures the location and time domain size T and frequency domain size F of the DRP through signaling. Before each of the discovery periods, it is known that,the eNB dynamically indicates the resource hopping range. In this embodiment, the frequency domain size of the resource hopping range is equal to DRP, and the time domain size T'_pT is less than or equal to T. The UE determines the sending position of the discovery signal in the period p according to the parameters and the resource hopping range of the current period, and the specific steps are as follows:

step 710: the UE receives the signaling of the eNB, and obtains the position of the DRP, the sending times k of the discovery signal, the time domain size T and the frequency domain size F, and the initial resource indication.

And

Step 720: and the UE receives the eNB signaling before the period p and determines the resource hopping range of the period p.

The signaling for indicating the resource hopping range is a common signaling, and is intended for all UEs participating in discovery signal transmission and reception in a cell. In this embodiment, the frequency domain size of the resource hopping range is equal to DRP, and the time domain size T'_p≤T。

Value and T 'of resource hopping range indication information in signaling'_pThe values can directly correspond to each other, for example, the value of the resource hopping range indication information bit field is v, and the value of the field is T'_pValue of (1), i.e. T'_pV; or the DRP is divided into multiple segments in time domain, the value of the resource hopping range indicator indicates the number of segments of the resource used for resource hopping, for example, the value of the resource hopping range indicator bit field is v, the size of each segment after DRP segmentation is s, then T'_p＝s×v。

T′_pThe value of (a) is determined by the eNB. According to one method of the present application, the eNB determines T 'according to the total number of UEs that need to transmit discovery signals in a period p'_pFor example, if the total number of UEs required to transmit discovery signals in period p is F × T/2, the eNB may adjust the value of v to T'_pSet to T/2. According to another method of the present application, the eNB adjusts T 'according to uplink traffic (PUSCH transmission) within a period p'_pThe value of (c). For example, if the eNB determines that the uplink traffic volume in the period p is higher than the uplink traffic volume in the period p-1 according to the UE uplink cache information reported by the UE, or the eNB determines that the resource of the subframe where the DRP is located needs to be used for retransmission of the PUSCH in the period p according to the currently received PUSCH error rate, and the required resource volume is higher than the period p-1, the eNB reduces T 'according to the information'_pIn order to meet the requirements of PUSCH transmission.

According to a third method of the present application, the eNB determines T 'comprehensively according to the two factors, i.e., the total number of UEs that need to transmit discovery signals in the period p and the uplink traffic in the period p'_pValue of (1), i.e. T'_p＝(M_D2D,M_UL) In which N is_D2DIndicates the total number of UEs required to transmit discovery signals in period p, M_ULRepresents the resource required by the uplink service in the period p, and the value is estimated by the eNB as the subframe M required by the PUSCH retransmission in the period p_rAnd the number M of the subframe required by PUSCH new transmission_nObtaining weights, e.g.

Represents M_D2DAnd M_ULTo T'_pOf (c), e.g. T'_p＝min(M_D2D×k/F,T-M_UL)。

if the logical time domain index of the UE transmitting resources in the period p-1 is greater than T'_pThen the eNB should reallocate the transmission resource for the UE before the period p, i.e. the UE needs to reacquire the transmission resource indication of the eNB. If the UE does not successfully detect the transmission resource indication re-issued by the eNB before the period p, the UE may perform an operation according to actual requirements, for example, abandon the transmission resource calculation of the current period p; if the UE successfully detects the transmission resource indication retransmitted by the eNB before the period p (it needs to be specially indicated that the transmission resource indication signaling retransmitted by the eNB and detected by the UE can indicate T'_pBefore or after the signaling of (c), the same applies below), and the resource time-frequency domain index is

And

step 730 is executed to determine the logical time-frequency domain index sum and the time-frequency domain index of the transmission resource in the period p, at this time

And the formula (9),(10) T in (1) is replaced by T'_p，F′_pAnd F is replaced.

If the logical time domain index of the UE transmitting resources in the period p-1 is not more than T'_pAnd k is 1, or>1 and the UE sends the index corresponding to the resource in the period p-1

The UE directly performs step 730.

If the logical time domain index of the UE transmitting resources in the period p-1 is not more than T'_pBut k is>₁And the UE sends the index corresponding to the resource in the period p-1

The eNB should reallocate the transmission resource for the UE before the period p, i.e. the UE needs to reacquire the transmission resource indication of the eNB. If the UE does not successfully detect the sending resource indication retransmitted by the eNB before the period p, the UE operates according to actual requirements, for example, the sending resource calculation of the current period p is abandoned; if the UE successfully detects the sending resource indication retransmitted by the eNB before the period p, and the resource time-frequency domain index is

And

And replacing T in formulas (9) and (10) with T'_p，F′_pAnd F is replaced.

Step 730: the UE determines the resource location for transmitting the discovery signal in the period p and transmits the discovery signal.

or

Or

I is more than or equal to 0 and less than k, and replacing T in formulas (9) and (10) by T'_p，F′_pAnd F is replaced.

firstly, determining the logical time-frequency domain index of the transmission resource in the period p according to the formula (14) and the formula (15)

And

at this time

Then, a time-frequency domain index of the transmission resource within the period p is determined according to equation (5) and equation (6) or equation (7) when k is 1, and when k is 1>Determining the time-frequency domain index of the transmission resource in the period p according to formula (8) and formula (9) or formula (10) at time 1, and replacing T in formulas (9) and (10) by T'_p，F′_pReplacing with F;

and replacing T in formulas (9) and (10) with T'_p，F′_pAnd F is replaced.

This embodiment ends by this. According to the mode, the eNB can dynamically adjust the resource hopping range on the time domain according to the number of the UE which discovers the resources in the current period, and can use the wireless resources more effectively.

The foregoing is a specific implementation of the method for sending the D2D discovery signal in this application, and the present application also provides a device for sending the D2D discovery signal, which can be used to implement the foregoing method. Fig. 3 is a schematic diagram of a specific structure of a transmitting apparatus according to the present application. As shown in fig. 3, the apparatus includes: the device comprises a resource pool determining unit, a sending resource determining unit and a signal sending unit.

The resource pool determining unit is configured to receive a signaling sent by the eNB, determine a location and a size of a resource pool DRP used for sending a discovery signal, and send an initial resource allocation indication to the UE.

A transmission resource determining unit for determining a resource hopping range and a D2D discovery signal in a corresponding period before each period pNumber of transmissions k_p(ii) a And determining a logic time-frequency domain index of the D2D discovery signal sent in each period p according to the resource hopping range in the period and the initial resource allocation indication, and then determining a logic time-frequency domain index according to the logic time-frequency domain index and k in the corresponding period_pThe time-frequency domain index of the transmitted D2D discovery signal in the period p is determined.

A signal transmission unit for time-frequency domain index (t) in DRP in each period p_p,f_p) The D2D discovery signal is transmitted on the indicated resource location.

Wherein, t_pIndex in DRP for subframe where transmission resource for transmitting D2D discovery signal in period p is located, f_pAnd the index of the frequency domain resource where the transmission resource for transmitting the D2D discovery signal in the period p is located on the whole uplink bandwidth or in the DRP.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims

1. A D2D discovery signal transmission method, comprising:

the method comprises the steps that UE receives a signaling sent by a base station, and determines the position and the size of a resource pool DRP used for sending a discovery signal and an initial resource allocation indication of the UE;

In each period p, the UE determines a logic time-frequency domain index of a D2D discovery signal sent in the period p according to the resource hopping range in the period p and the initial resource allocation indication, and then determines a k in the corresponding period according to the logic time-frequency domain index and the k in the corresponding period_pDetermining the time-frequency domain index (t) of the transmitted D2D discovery signal within the period p_p,f_p) And time-frequency domain index (t) in the DRP_p,f_p) Transmitting the D2D discovery signal on the indicated resource location;

wherein k is_p>1，t_pIndex in the DRP for subframe where transmission resource for transmitting D2D discovery signal in period p is located, f_pThe index of the frequency domain resource where the transmission resource is located in the period p on the whole uplink bandwidth or in the DRP.

2. The method of claim 1, wherein the UE determines k within a corresponding period p_pThe method comprises the following steps: before each period, the UE receives an instruction sent by the base station, and the instruction carries k in a corresponding period p_p(ii) a Or, the UE receives the discovery signal transmission times k indicated by the base station semi-static state, and takes the k as the discovery signal transmission times k of all periods in the period of validity of the semi-static configuration_p。

3. The method of claim 1, wherein the UE determines that a time domain size of a resource hopping range within a period is the same as a time domain size of the DRP;

the UE receives the frequency domain size F 'of the resource hopping range indicated by the semi-static state of the base station, and takes the F' as the frequency domain size F 'of all periods in the period of validity of the semi-static configuration'_p(ii) a Or,

before each period, the UE receives an instruction sent by a base station, wherein the instruction carries F 'in a corresponding period p'_p(ii) a Or,

the UE according to k in the period p_pComputing

4. The method of claim 1, wherein the UE determines a frequency domain size F 'of a resource hopping range within a period p'_pThe same as the frequency domain size F of the DRP;

the UE determines the time domain size T 'of the resource hopping range in the period p'_pThe method comprises the following steps: before each period, the UE receives an instruction sent by a base station, wherein the instruction carries T 'in a corresponding period p'_p。

5. The method of claim 3, wherein determining the logical time domain index of the D2D discovery signal transmitted within the period p

The method comprises the following steps:

or

Wherein,

and

a logical time domain index and a logical frequency domain index of a D2D discovery signal transmitted in the period p-1, respectively;

The method comprises the following steps:

or

Where Δ and c are both adjustment factors.

6. The method of claim 4, whereinCharacterized in that the logical time domain index of the D2D discovery signal is transmitted within the determined period p

The method comprises the following steps:

or

The method comprises the following steps:

or

7. The method according to claim 5 or 6, wherein, when the period p is the first period,

wherein,

and

8. The method according to claim 3 or 4, wherein, when the period p is the first period,

wherein,

and

9. The method of claim 5, wherein the constraint relationship is based on

The time domain index of the transmitted D2D discovery signal within period p is determined, where,

0≤i<k_p,

t_p,ian index of a sub-frame where a transmission resource is located in a DRP when a D2D discovery signal is transmitted for the ith time in a period p, N is the time domain size T of the DRP or the index of the termination position of the time domain resource occupied by the DRP in the period p, T_p，lAn index of a subframe in which the transmission resource is located in the DRP when the D2D discovery signal is transmitted for the first time in the period p;

wherein f is_p,iIndex of frequency domain resource where transmission resource is located on whole uplink bandwidth for ith time of sending D2D discovery signal in period p, B_wFor uplink system bandwidth, l is the index of the number of times that D2D discovery signals are sent, R_PUCCHThe bandwidth of the frequency domain resource used for the PUCCH transmission and the PUCCH guard interval for the head end and the tail end in the uplink bandwidth.

10. The method of claim 4, wherein the constraint relationship is based on

0≤i<k_p,

11. Process according to claim 3 or 4, characterized in that when F'_pIs F 'carried in the instruction sent by the base station before each cycle'_pOr, when F'_pAccording to k in the period p_pCalculating F'_pIf the UE is in the period p-1, the logical frequency domain index of the transmission resource is greater than F'_p，

Or, when T'_pIs T 'carried in the instruction sent by the base station before each period'_pIf the logical time domain index of the sending resource of the UE in the period p-1 is more than T'_pOr, if the logical time domain index of the transmission resource in the period p-1 is not greater than T'_pAnd k is>1, and the UE transmits the index corresponding to the resource in the period p-1

The method further comprises: the UE reacquires the sending resource indication of the base station before the period p;

And

And

k is the number of times of sending the discovery signal indicated by the base station in a semi-static state.

12. Process according to claim 3, characterized in that F'_pF 'indicated for p front base stations per cycle'_pThen, the base station sends the total number N of the UE of the discovery signal according to the period p_D2DAnd/or uplink traffic N in period p_ULDetermining the F'_p。

13. The method according to claim 12, wherein if the base station determines that uplink traffic volume in the period p is higher than uplink traffic volume in the period p-1 according to UE uplink buffer information reported by the UE, or the base station determines that PUSCH retransmission needs to be performed using resources of a subframe where the DRP is located in the period p according to a currently received PUSCH error rate, and the required resource volume is higher than the period p-1, the base station reduces F'_pThe value of (c).

14. Process according to claim 12, characterized in that F'_p＝min(N_D2D×k/T,F-N_UL) The T and the F are respectively the time domain and the frequency domain of the DRP, and k is the number of times of sending the discovery signal indicated by the base station in the semi-static state.

15. The method of claim 4, wherein the base station transmits the discovery signal according to the period p, and wherein N is a total number of UEs_D2DAnd/or uplink traffic N in period p_ULDetermining the T'_p。

16. The method of claim 15, wherein if the base station determines that uplink traffic volume in the period p is higher than uplink traffic volume in the period p-1 according to UE uplink buffer information reported by the UE, or the base station determines that PUSCH retransmission needs to be performed by using resources of a subframe where the DRP is located in the period p according to a currently received PUSCH error rate, and the required resource volume is higher than the period p-1, the base station reduces T'_pThe value of (c).

17. The process of claim 15, characterized by T'_p＝min(M_D2D×k/F,T-M_UL) The T and the F are respectively the time domain and the frequency domain of the DRP, and k is the number of times of sending the discovery signal indicated by the base station in the semi-static state.

18. The method of claim 1, wherein the UE determines that a time domain size of a resource hopping range within a period is the same as a time domain size of the DRP;

wherein, the F is the frequency domain size of the DRP.

19. The method of claim 18, wherein determining the logical time domain index of the transmission resource for the first transmission of the D2D discovery signal within the period p

The method comprises the following steps:

or

Wherein k is_p-1The number of times the signal is found for D2D within period p-1,

is the k-th in period p-1_p-1Logical frequency domain index of transmission resources transmitting D2D discovery signals 1 time,

is the k-th in period p-1_p-1A logical time domain index of a transmission resource of the secondary transmission D2D discovery signal;

The method comprises the following steps:

or

Wherein,

is the k-th in period p-1_p-1Logical time domain index of transmission resource transmitting D2D discovery signal 1 time.

20. The method of claim 19, wherein when the period p is the first period,

wherein,

and

21. The method of claim 18, wherein when the period p is the first period,

wherein,

and

22. The method of claim 19, 20 or 21,

logical time domain index of j-th transmission D2D discovery signal within the determination period p except for the first transmission

The method comprises the following steps:

or

Wherein,

for the logical frequency domain index of the j-1 st transmission D2D discovery signal within the period p,

a logical time domain index of the D2D discovery signal for the j-1 st transmission within the period p;

The method comprises the following steps:

wherein, 0<j<k_p。

23. The method of claim 1, 2 or 3,

24. The method of claim 18, wherein a logical frequency domain index of resources is greater than F 'if the UE transmits in period p-1'_pThen the UE is determining the F'_pThereafter, the method further comprises: the UE acquires the sending resource indication of the base station again;

And

And

the logical time-frequency domain index directly used as the transmission resource for the first transmission of the D2D signal in the period p, and is based on the index

And

25. A D2D discovery signal transmitting device, comprising: a resource pool determining unit, a sending resource determining unit and a signal sending unit;

the resource pool determining unit is configured to receive a signaling sent by a base station, determine a location and a size of a resource pool DRP used for sending a discovery signal, and send an initial resource allocation indication to the UE;

the transmission resource determining unit is used for determining the resource hopping range and the number k of times of transmitting the D2D discovery signal in the corresponding period before each period p_p(ii) a And is used for determining the logic time-frequency domain index of the D2D discovery signal sent in the period p according to the resource hopping range and the initial resource allocation indication in the period p in each period p, and then according to the logicTime-frequency domain index and k in corresponding period_pDetermining the time-frequency domain index of the D2D discovery signal transmitted in the period p;

wherein k is_p>1，t_pIndex in the DRP for subframe where transmission resource for transmitting D2D discovery signal in period p is located, f_pAnd the index of the frequency domain resource where the transmission resource for transmitting the D2D discovery signal in the period p is located on the whole uplink bandwidth or in the DRP.

26. The apparatus of claim 25, wherein the transmission resource determining unit determines k in a corresponding period p_pThe method comprises the following steps: before each period, receiving an instruction sent by the base station, wherein the instruction carries k in the corresponding period p_p(ii) a Or receiving the number k of discovery signal transmissions indicated by the base station in a semi-static state, and taking the k as the number k of discovery signal transmissions of all periods within the validity period of the semi-static configuration_p。

27. The apparatus of claim 25, wherein the transmission resource determining unit determines that a time domain size of a resource hopping range within a period is the same as a time domain size of the DRP;

the transmission resource determining unit determines a frequency domain size F 'of a resource hopping range within a corresponding period p'_pThe method comprises the following steps:

receiving the frequency domain size F 'of the resource hopping range indicated by the semi-static state of the base station, and taking the F' as the frequency domain size F 'of all periods in the period of validity of the semi-static configuration'_p(ii) a Or,

before each cycle, receiving an instruction sent by a base station, wherein the instruction carries F 'in a corresponding cycle p'_p(ii) a Or,

according to k within the period p_pComputing

28. The apparatus of claim 25, wherein the transmit resource determining unit determines a frequency domain size F 'of a resource hopping range within a period p'_pThe same as the frequency domain size F of the DRP;

the transmission resource determining unit determines a time domain size T 'of a resource hopping range within a period p'_pThe method comprises the following steps: before each period, receiving an instruction sent by a base station, wherein the instruction carries T 'in a corresponding period p'_p。

29. The apparatus of claim 27, wherein the transmission resource determining unit determines a logical time domain index of a D2D discovery signal transmitted within a period p

The method comprises the following steps:

or

Wherein,

and

the transmission resource determination unit determines a logical frequency domain index of a discovery signal of D2D transmitted within a period p

The method comprises the following steps:

or

Where Δ and c are both adjustment factors.

30. The apparatus of claim 28, wherein the transmission resource determining unit determines a logical time domain index of a D2D discovery signal transmitted within a period p

The method comprises the following steps:

or

The method comprises the following steps:

or

31. The apparatus according to claim 29 or 30, wherein when the period p is the first period,

wherein,

and

32. The apparatus according to claim 27 or 28, wherein when the period p is the first period,

wherein,

and

33. The apparatus of claim 29, wherein the transmission resource determining unit determines the transmission resource according to a constraint relationship

0≤i<k_p,

the determining, by the transmission resource determining unit, a frequency domain index of a D2D discovery signal transmitted in a period p includes:

34. The apparatus of claim 28, wherein the transmission resource determining unit is configured to determine the transmission resource according to a constraint relationship

0≤i<k_p,

wherein f is_p,iFrequency domain resource of the transmission resource when the ith D2D discovery signal is transmitted in the period pThe index of the source over the entire upstream bandwidth; or,

35. A device according to claim 27 or 28, wherein when F'_pIs F 'carried in the instruction sent by the base station before each cycle'_pOr, when F'_pAccording to k in the period p_pCalculating F'_pIf the UE is in the period p-1, the logical frequency domain index of the transmission resource is greater than F'_p，

The transmission resource determining unit is further configured to reacquire the transmission resource indication of the base station before the period p;

the determining, by the transmission resource determining unit, a logical time-frequency domain index of the D2D discovery signal transmitted in the period p includes: time-frequency domain index included in transmission resource indication to be reacquired

And

respectively as the logical time-frequency domain index of the transmission resource in the period p-1, for determining the logical time-frequency domain of the transmission resource in the period pThe domain index, or the time-frequency domain index included in the transmission resource indication to be obtained again

And

36. The device of claim 27, wherein F'_pF 'indicated for p front base stations per cycle'_pThen, the base station sends the total number N of the UE of the discovery signal according to the period p_D2DAnd/or uplink traffic N in period p_ULDetermining the F'_p。

37. The apparatus of claim 36, wherein if the base station determines that uplink traffic volume in the period p is higher than uplink traffic volume in the period p-1 according to UE uplink buffer information reported by the UE, or determines that PUSCH retransmission needs to be performed by using resources of a subframe where the DRP is located in the period p according to a currently received PUSCH error rate, and the required resource volume is higher than the period p-1, the base station reduces F'_pThe value of (c).

38. The device of claim 36, wherein F'_p＝min(N_D2D×k/T,F-N_UL) The T and the F are respectively the time domain and the frequency domain of the DRP, and k is the number of times of sending the discovery signal indicated by the base station in the semi-static state.

39. The apparatus of claim 28, wherein the base station transmits a total number N of UEs transmitting discovery signals according to a period p_D2DAnd/or uplink traffic N in period p_ULDetermining the T'_p。

40. The apparatus of claim 39, wherein if the base station determines that uplink traffic volume in the period p is higher than uplink traffic volume in the period p-1 according to the uplink buffer information of the UE reported by the apparatus, or the base station determines that the resource of the subframe where the DRP is located needs to be utilized for retransmission of the PUSCH in the period p according to the currently received PUSCH error rate, and the required resource volume is higher than the period p-1, the base station reduces T'_pThe value of (c).

41. A device according to claim 39, wherein T'_p＝min(M_D2D×k/F,T-M_UL) The T and the F are respectively the time domain and the frequency domain of the DRP, and k is the number of times of sending the discovery signal indicated by the base station in the semi-static state.

42. The apparatus of claim 25, wherein the transmission resource determining unit determines that a time domain size of a resource hopping range within a period is the same as a time domain size of the DRP;

wherein, the F is the frequency domain size of the DRP.

43. The apparatus of claim 42, wherein the transmission resource determining unit determines a logical time domain index of a transmission resource for transmitting the D2D discovery signal for the first time within the period p

The method comprises the following steps:

or

the transmission resource determination unit determines a logical frequency domain index of a transmission resource for first transmitting the D2D discovery signal within the period p

The method comprises the following steps:

or

Wherein,

44. The apparatus of claim 43, wherein when the period p is the first period,

wherein,

and

45. The apparatus of claim 42, wherein when the period p is the first period,

wherein,

and

46. The apparatus of claim 43, 44 or 45,

the transmission resource determination unit determines a logical time domain index of a j-th transmission D2D discovery signal within a period p except for the first transmission

The method comprises the following steps:

or

Wherein,

the transmission resource determination unit determines a logical frequency domain index of a j-th transmission D2D discovery signal except for a first transmission within a period p

The method comprises the following steps:

wherein, 0<j<k_p。

47. The apparatus of claim 25, 26 or 27, wherein the transmission resource determining unit determines a time domain index t for transmitting the D2D discovery signal within a period p_pThe method comprises the following steps:

the transmission resource determination unit determines a frequency domain index f for transmitting the D2D discovery signal within the period p_pThe method comprises the following steps:

wherein f is_p,iIs the ith transmission in the period pD2D sends the index of the frequency domain resource where the resource is located on the whole uplink bandwidth when finding the signal.

48. The apparatus of claim 42, wherein if the transmission resource determining unit transmits the logical frequency domain index of the resource in the period p-1 is greater than F'_pThe transmission resource determining unit is determining F'_pThen, the method is further used for reacquiring the sending resource indication of the base station;

the determining, by the transmission resource determining unit, a logical time-frequency domain index of the D2D discovery signal transmitted in the period p includes: the UE indexes the time-frequency domain included in the reacquired transmission resource indication

And

the logical time-frequency domain indexes are respectively used as the logical time-frequency domain indexes of the sending resources for sending the D2D signal for the first time in the period p-1 and are used for determining the logical time-frequency domain indexes of the sending resources for each time in the period p; or, the transmission resource determining unit may determine the time-frequency domain index included in the re-acquired transmission resource indication

And

And