CN105472701B - Method and device for sending D2D discovery signal in LTE network - Google Patents

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

Method and device for sending D2D discovery signal in LTE network

technical field

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

Background technique

At present, D2D (Device to Device) communication technology has been accepted by the 3GPP standard due to its huge potential value in the field of public safety and general civil communication, and has become a candidate evolution direction of the LTE-A (LTE Advanced) system.

According to the current 3GPP conclusions, UEs supporting D2D functions (hereinafter referred to as UEs) will transmit and receive D2D signals in a half-duplex manner, that is, UEs will not support simultaneous transmission and reception of D2D signals. When the UE is under the coverage of the wireless network, the D2D communication will only occupy the uplink carrier frequency (FDD system) or uplink subframe (TDD system).

Because the UE works in half-duplex mode, if multiple UEs send a discovery signal (DS, Discovery Signal) at the same time, that is, send DS in the form of frequency multiplexing (FDM), these terminals will not be able to discover each other. .

In order to solve the above-mentioned half-duplex limitation, the eNB may allocate time multiplexing (TDM) resources to the above-mentioned UEs that transmit DSs in the FDM manner through multiple scheduling. But this method will introduce a lot of signaling overhead.

Another way is for the eNB to semi-statically indicate the location and size of the resource pool (DRP) used for sending the discovery signal through a broadcast message, where the DRP is a set of resources that can be used by the UE to send the discovery signal, and each DRP contains T×F resource units (RU), as shown in Figure 1. In each cycle, the eNB allocates a RU for carrying a discovery signal in the DRP for the UE that applies for the discovery resource. The cycle here may be a discovery cycle or the like. In each cycle, the position index t _p in the time domain of the RU that sends the discovery signal allocated to the UE is relative to the position t _p-1 in the time domain of the RU that sends the discovery signal to the UE in the previous cycle to generate f _p-1 . offset, where f _p-1 is the position index in the frequency domain of the RU that the UE sent the discovery signal in the last cycle; at the same time, the frequency domain position f _p of the RU that sent the discovery signal in the cycle p will also have a relative offset. f _p-1 . The above resource hopping process 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)+Δ,F) or f _p =mod(f _p-1 +c,F) (2)

where Δ and c are adjustment factors. In this way, it can be ensured that multiple UEs that transmit discovery signals in the same subframe in a frequency division multiplexing (FDM) manner in the period p-1 have different subframe positions for transmitting the discovery signals in the period p, so that the above UE can be avoided. The half-duplex limit in between.

However, this method has a serious defect. In the actual network, the number of UEs that request the eNB for discovery signal transmission resources (hereinafter referred to as discovery resources) changes dynamically in different periods. However, because the size of the DRP is semi-statically configured , which results in that the size of the DRP cannot be adjusted in real time to adapt to the number of resources currently occupied by the UEs actually participating in the sending of the discovery signal. When the number of resources occupied by the UE that actually sends the discovery signal is less than the number of resources contained in the DRP, after the resource hopping is performed according to formula (1) and formula (2), the above-mentioned sending resources of the UE that actually sends the discovery signal will be distributed to In the entire DRP range, the unused radio resources in the DRP will be divided, and the divided radio resources are difficult to be reused in the LTE system, which will eventually lead to waste of radio resources.

Under the premise that the half-duplex limitation can be eliminated, there is no mature solution to the problem of how to realize the indication of D2D discovery resources with low signaling overhead and avoid the waste of radio resources.

SUMMARY OF THE INVENTION

The present application provides a method for sending a D2D discovery signal in an LTE network, which can instruct a UE to send a resource location in a flexible manner with low signaling overhead, and more efficiently use the discovery resource to send a D2D discovery signal.

A method for sending D2D discovery signals in an LTE network, comprising:

The UE receives the signaling sent by the eNB, and determines the location and size of the resource pool DRP used for sending the discovery signal, and the initial resource allocation indication of the UE;

Before each period p, the UE determines the resource hopping range in the corresponding period p and the number of times k _p of D2D discovery signal transmission;

In each period p, the UE determines the logical time-frequency domain index for sending the D2D discovery signal in the period p according to the resource hopping range in the period p and the initial resource allocation indication, and then according to the logical time-frequency index domain index and k _p in the corresponding period, determine the time-frequency domain index (t _p , f _p ) of the D2D discovery signal sent in the period p, and indicate in the DRP the time-frequency domain index (t _p , f _p ) The D2D discovery signal is sent on the resource location of ;

Wherein, t _p is the index in the DRP of the subframe where the transmission resource of the D2D discovery signal is located in the period p, and f _p is the frequency domain resource in the period p where the transmission resource is located in the entire uplink bandwidth or in the Indexes within the DRP.

Preferably, the UE determining k _p in the corresponding period p includes: before each period, the UE receives an instruction sent by the eNB, and the instruction carries k _{p in the corresponding period p} ; or, the UE receives the eNB The number of times k of discovery signal transmissions indicated by the semi-static configuration is taken as the number of times k _p of discovery signal transmissions in all periods within the validity period of the semi-static configuration.

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

The UE determines the frequency domain size F' _p of the resource hopping range within the corresponding period p, including:

The UE receives the frequency domain size F' of the resource hopping range indicated by the eNB semi-statically, and uses the F' as the frequency domain size F' _p of all periods within the validity period of the semi-static configuration; or,

Before each cycle, the UE receives an instruction sent by the eNB, and the instruction carries F′ _{p in the corresponding cycle p} ; or,

其中，所述T和F分别为所述DRP的时域和频域大小。The UE calculates according to k _p in the period p

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

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

The determination by the UE of the time domain size T′ _{p of the resource hopping range in the period p} includes: before each period, the UE receives an instruction sent by the eNB, and the instruction carries the T′ _{p in the corresponding period p} .

包括：Preferably, the logical time domain index for sending the D2D discovery signal within the determination period p

include:

或

or

包括：The logical frequency domain index of the D2D discovery signal sent within the determination period p

include:

或

or

包括：Preferably, the logical time domain index for sending the D2D discovery signal within the determination period p

include:

或

or

包括：The logical frequency domain index of the D2D discovery signal sent within the determination period p

include:

或

or

其中，和分别为所述 初始资源分配指示中包括的时频域索引。 Preferably, when the period p is the first period,

where and are respectively time-frequency domain indices included in the initial resource allocation indication.

其中，

和

分别为所述初始资源分配指示中包括的时频域索引。Preferably, when the period p is the first period,

in,

and

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

Preferably, when k _p =1,

The time domain index t _{p for sending the D2D discovery signal within the determination period p} includes:

The frequency domain index f _{p for sending the D2D discovery signal within the determination period p} includes:

其中，f_p为周期p内发送D2D发现信号的发送资源所在频域资源在整个上行带宽上的索引，R_PUCCH为上行带宽首端和末端用于PUCCH传输和PUCCH保护间隔的频域资源的带宽；或者，

其中，f_p为周期p内发送D2D发现信号的发送资源所在频域资源在整个上行带宽上的索引。

Among them, f _p is the index of the frequency domain resource where the transmission resource of the D2D discovery signal is sent in the period p on the entire uplink bandwidth, R _PUCCH is the bandwidth of the frequency domain resource used for PUCCH transmission and PUCCH guard interval at the beginning and end of the uplink bandwidth ;or,

Wherein, f _p is the index of the frequency domain resource where the transmission resource of the D2D discovery signal is sent in the period p on the entire uplink bandwidth.

Preferably, when k _p >1,

t_p,i为周期p内第i次发送D2D发现 信号时发送资源所在子帧在DRP内的索引； Determine the time domain index of the D2D discovery signal sent within the period p according to the constraint relationship, where,

t _p,i is the index in the DRP of the subframe where the transmission resource is located when the i-th D2D discovery signal is transmitted in the period p;

其中，f_p,i为周期p内第i次发送D2D发现信号时发送资源所在频域资源在整个上行带宽上的索引；或者，

其中，f_p,i为周期p内第i次发送D2D发现信号时发送资源所在频域资源在整个上行带宽上的索引。The frequency domain index for sending the D2D discovery signal within the determination period p includes:

where f _p,i is the index of the frequency domain resource where the transmission resource is located on the entire uplink bandwidth when the i-th D2D discovery signal is sent in the period p; or,

Wherein, f _p,i is the index of the frequency domain resource where the transmission resource is located on the entire uplink bandwidth when the i-th D2D discovery signal is transmitted in the period p.

Preferably, when k _p >1,

t_p,i为周期p内第i次发送D2D发现信 号时发送资源所在子帧在DRP内的索引； Determine the time domain index of the D2D discovery signal sent within the period p according to the constraint relationship, where,

t _p,i is the index in the DRP of the subframe where the transmission resource is located when the i-th D2D discovery signal is transmitted in the period p;

其中，f_p,i为周期p内第i次发送D2D发现信号时发送资源所在频域资源在整个上行带宽上的索引；或者，

其中，f_p,i为周期p内第i次发送D2D发现信号时发送资源所在频域资源在整个上行带宽上的索引。The frequency domain index for sending the D2D discovery signal within the determination period p includes:

where f _p,i is the index of the frequency domain resource where the transmission resource is located on the entire uplink bandwidth when the i-th D2D discovery signal is sent in the period p; or,

Wherein, f _p,i is the index of the frequency domain resource where the transmission resource is located on the entire uplink bandwidth when the i-th D2D discovery signal is transmitted in the period p.

Preferably, when the F' _p is the F' _p carried in the instruction sent by the eNB before each cycle, or when the F' _p is the calculation of F' _p according to k _p in the cycle p, if The logical frequency domain index of the transmission resource of the UE in the period p-1 is greater than F' _p ,

Or, when T′ _p is T′ _p carried in the instruction sent by the eNB before each cycle, if the logical time domain index of the transmission resource of the UE in cycle p-1 is greater than T′ _p , or, if The logical time domain index of the transmission resource in the period p-1 is not greater than _T'p and k>1, and the UE transmits the corresponding index of the resource in the period p-1

Then the method further includes: the UE reacquires the sending resource indication of the eNB before the period p;

和

分别作为周期p-1中所述发送资源的逻辑时频域索引，用于确定周期p中所述发送资源的逻辑时频域索引，或者，所述UE将重新获取的发送资源指示中包括的时频域索引

和

直接作为周期p中所述发送资源的逻辑时频域索引；其中，

k为eNB半静态指示的发现信号发送次数。The logical time-frequency domain index for sending the D2D discovery signal within the determination period p includes: the time-frequency domain index included in the transmission resource indication to be re-acquired by the UE

and

They are respectively used as the logical time-frequency domain indexes of the transmission resources in the period p-1, which are used to determine the logical time-frequency domain indexes of the transmission resources in the period p, or, the UE will re-acquire the information included in the transmission resource indication. time-frequency index

and

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

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

Preferably, when the F' _p is the F' _p indicated by the eNB before each cycle p, the eNB determines the number of UEs that send the discovery signal N _D2D and/or the uplink traffic volume N _UL in the cycle p according to the total number of UEs that send the discovery signal in the cycle p. said _F'p .

Preferably, if the eNB determines, according to the UE uplink buffer information reported by the UE, that the uplink traffic volume in the period p is higher than the uplink traffic volume in the period p-1, or if the eNB determines that the amount of uplink traffic in the period p is higher than the current received PUSCH bit error rate Retransmission of the PUSCH is performed using the resources of the subframe where the DRP is located, and the required amount of resources is higher than the period _p -1, then the eNB reduces the value of F'p.

Preferably, F′ _p =min( _ND2D ×k/T,FN _UL ), the T and F are the size of the time domain and the frequency domain of the DRP respectively, and k is the number of discovery signal transmission times indicated by the eNB semi-statically .

Preferably, the eNB determines the T′ _p according to the total number N _D2D of UEs sending the discovery signal in the period p and/or the uplink traffic volume N _UL in the period p.

Preferably, if the eNB determines, according to the UE uplink buffer information reported by the UE, that the uplink traffic volume in the period p is higher than the uplink traffic volume in the period p-1, or if the eNB determines that the amount of uplink traffic in the period p is higher than the current received PUSCH bit error rate Retransmission of the PUSCH is performed using the resources of the subframe where the DRP is located, and the required amount of resources is higher than the period _p -1, then the eNB reduces the value of T'p.

Preferably, T′ _p =min( _MD2D ×k/F,TM _UL ), the T and F are the size of the time domain and the frequency domain of the DRP, respectively, and k is the number of discovery signal transmission times indicated by the eNB semi-statically .

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

其中，所述F为所述DRP的频域大小。The UE determines the frequency domain size F' _p of the resource hopping range within the corresponding period p, including:

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

包括：Preferably, the logical time domain index of the sending resource for sending the D2D discovery signal for the first time within the determination period p

include:

或

or

包括：The logical frequency domain index of the sending resource for sending the D2D discovery signal for the first time within the determination period p

include:

或

or

其中，

和

分别为所述初始资源分配指示中包括的时频域索引。Preferably, when the period p is the first period,

in,

and

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

其中，

和

分别为所述初始资源分配指示中包括的时频域索引。Preferably, when the period p is the first period,

in,

and

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

包括：Preferably, the logical time domain index of the jth transmission of the D2D discovery signal other than the first transmission in the determination period p

include:

或

or

包括：The logical frequency domain index of the jth transmission of the D2D discovery signal except the first transmission in the determination period p

include:

或；其中，0<j<k_p。

or; where 0<j<k _p .

Preferably, the time domain index t _{p for sending the D2D discovery signal in the determination period p} includes:

The frequency domain index f _{p for sending the D2D discovery signal within the determination period p} includes:

其中，f_p,i为周期p内第i次发送D2D发现信号时发送资源所在频域资源在整个上行带宽上的索引，R_PUCCH为上行带宽首端和末端用于PUCCH传输和PUCCH保护间隔的频域资源的带宽；或者，

其中，f_p,i为周期p内第i次发送D2D发现信号时发送资源所在频域资源在整个上行带宽上的索引。

Among them, f _p,i is the index of the frequency domain resource where the transmission resource is located in the entire uplink bandwidth when the i-th D2D discovery signal is transmitted in the period p, and R _PUCCH is the first and the end of the uplink bandwidth used for PUCCH transmission and PUCCH guard interval the bandwidth of the frequency domain resource; or,

Wherein, f _p,i is the index of the frequency domain resource where the transmission resource is located on the entire uplink bandwidth when the i-th D2D discovery signal is transmitted in the period p.

Preferably, if the logical frequency domain index of the resource sent by the UE in the period p-1 is greater than F' _p , after the UE determines the F' _p , the method further includes: the UE re-acquires the eNB. 's sending resource indication;

和

分别作为周期p-1中第一次发送D2D信号的发送资源的逻辑时频域索引，用于确定周期p中各次发送资源的逻辑时频域索引；或者，所述UE将重新获取的发送资源指示中包括的时频域索引

和

直接作为周期p中第一次发送D2D信号的发送资源的逻辑时频域索引，并根据该

和

确定周期p中其余各次发送D2D信号的发送资源的逻辑时频域索引。The logical time-frequency domain index for sending the D2D discovery signal within the determination period p includes: the time-frequency domain index included in the transmission resource indication to be re-acquired by the UE

and

are respectively used as the logical time-frequency domain indexes of the transmission resources for the first transmission of the D2D signal in the period p-1, and are used to determine the logical time-frequency domain indexes of the transmission resources in the period p; Time-frequency domain index included in the resource indication

and

It is directly used as the logical time-frequency domain index of the transmission resource for the first transmission of the D2D signal in the period p, and according to this

and

The logical time-frequency domain indexes of the transmission resources for the remaining times of transmitting the D2D signal in the period p are determined.

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

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

The sending resource determination unit is used to determine, before each cycle p, the resource hopping range and the number of times k _p of D2D discovery signal sending in the corresponding cycle; The hopping range and the initial resource allocation indication determine the logical time-frequency domain index for sending the D2D discovery signal within the period p, and then determine the D2D sending within the period p according to the logical time-frequency domain index and k _p in the corresponding period Find the time-frequency domain index of the signal;

the signal sending unit, configured to send the D2D discovery signal at the resource position indicated by the time-frequency domain index (t _p , f _p ) in the DRP in each period p;

Wherein, t _p is the index in the DRP of the subframe where the transmission resource for sending the D2D discovery signal in the period p is located, and f _p is the frequency domain resource where the transmission resource for transmitting the D2D discovery signal in the period p is located on the entire uplink bandwidth or in the An index within the DRP.

In the technical solution proposed in this application, the UE obtains the location and size of the DRP by receiving the semi-static configuration of the eNB, and then determines the resource hopping range and the number of retransmissions of the discovery signal in each cycle according to the instructions of the eNB, and then according to the above parameters and corresponding The resource hopping method determines the resource location for sending the discovery reference signal in each cycle. According to different implementation schemes of the present application, only a small amount of coordination of wireless network signaling is required to avoid complete collision of discovery signals of different UEs, and to realize mutual discovery between any two UEs in the group within a short period of time. Reduce the signaling burden of the wireless network and the consumption of wireless resources. In addition, the above solution proposed in the present application has little modification to the existing system, does not affect the compatibility of the system, and is simple and efficient to implement.

Description of drawings

Fig. 1 is the schematic diagram of DRP structure;

2 is a schematic diagram of the overall flow of a method for sending a D2D discovery signal in the present application;

FIG. 3 is a schematic diagram of a basic structure of a device for sending a D2D discovery signal in the present application.

Detailed ways

In order to make the objectives, technical means and advantages of the present application more clear, the present application will be further described in detail below with reference to the accompanying drawings.

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

This application is mainly aimed at the mutual discovery process of UEs in D2D communication. Mutual discovery of UEs is the premise of D2D communication, and according to the prior art, a possible solution is to realize mutual discovery of UEs through coordination of wireless network signaling, which will seriously increase the signaling burden of the wireless network. Another possible solution is that the UE determines the time-frequency domain index of the sending resource of the current cycle based on the time-frequency domain index of the sending resource of the previous cycle according to the DRP size semi-statically configured by the eNB according to a certain resource hopping method. However, in this manner, when the number of resources occupied by the UEs actually participating in the sending of the discovery signal is less than the total number of DRP resources, it will cause serious waste of radio resources.

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

Step 210: The UE receives the signaling sent by the eNB to obtain the semi-statically configured DRP location and size, and the initial resource allocation indication.

The signaling sent by the eNB mentioned here 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.

The location of the DRP includes the time domain location and the frequency domain location of the RU included in the DRP, and the size of the DRP refers to the number T of RUs included in the time domain and the number F of RUs included in the frequency domain.

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

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

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

The number of times k of sending the discovery signal in the period p is an integer not less than 1. The value of k may remain unchanged in multiple cycles. In this case, the UE determines the number of times of sending the discovery signal in the foregoing multiple cycles by receiving semi-static signaling from the eNB. Alternatively, the value of k may change with the period. In this case, the UE needs to receive the signaling of the eNB before the period p to determine the value of k in the period p.

Step 230: According to the information obtained in steps 210 and 220, the UE determines the location where the discovery signal is sent within the period p, and sends the discovery signal.

In each period p, the UE determines the logical time-frequency domain index for sending the D2D discovery signal in the period p according to the resource hopping range and the initial resource allocation indication in the period p, and then according to the logical time-frequency domain index and the corresponding The number of times of sending in the cycle, determine the time-frequency domain index (t _p , f _p ) of the D2D discovery signal sent in the cycle p, and the time-frequency domain index (t _p , f _p ) in the DRP determined in step 210 indicates the A D2D discovery signal is sent on the resource location.

In order to facilitate the understanding of the application, the above technical solutions of the application are further described below in conjunction with the specific application conditions as follows:

Example 1:

In this embodiment, the eNB semi-statically configures the location of the DRP and 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 times the discovery signal is sent in each discovery cycle may change. The UE determines the sending position of the discovery signal in the period p according to the above parameters and the number of times k _p of discovery signal transmission in the current period, and the specific steps are as follows:

Step 310: The UE receives the signaling of the eNB, and obtains the location of the DRP, the time domain size T and the frequency domain size F, as well as the resource hopping range and the initial resource indication.

The frequency domain size F of the DRP can be indicated in a direct or indirect manner. In the direct mode, the eNB directly informs the UE of the start and end positions of the frequency domain resources occupied by the DRP in the DRP subframe through signaling. If it is an indirect method, the eNB indicates R _PUCCH through signaling, and R _PUCCH includes the frequency domain resources used for PUCCH transmission and PUCCH guard interval at the beginning and end of the uplink bandwidth. These resources cannot be used for D2D discovery signal transmission. The uplink system bandwidth The other bandwidth resources except the R _PUCCH indicated resource constitute the DRP, and the frequency domain size of the DRP is F=B _w -2×R _PUCCH , where B _w is the uplink system bandwidth.

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

和

The above signaling used to indicate the initial resource is UE-specific signaling, and the UE determines the logical time-frequency domain position of the initial transmission resource through the initial resource indication

and

Step 320: The UE receives the eNB signaling, and determines the number of times k _{p of discovery signal transmission in the period p} .

The above signaling is public signaling, and should be directed to all UEs in the cell participating in the transmission and reception of discovery signals.

Step 330: The UE determines the resource location for sending the discovery signal within the period p, and sends the discovery signal.

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

或

or

或

or

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

or,

where t _p is the index of the subframe where the transmission resource is located in the DRP, f _p in formula (6) is the index of the frequency domain resource where the transmission resource is located on the entire uplink bandwidth, and f _p in formula (7) is the transmission The index of the frequency domain resource where the resource is located in the DRP. According to the actual situation, formula (6) or (7) can be used to calculate and determine the index of the frequency domain resource. For example, when the base station directly sends the frequency domain size F of the DRP to the UE in step 310, the UE can adopt formula (7) to determine the frequency domain index; when the base station only notifies the UE of the resource R _PUCCH in step 310, the UE can adopt formula (7) to determine the frequency domain index. Equation (6) determines the frequency domain index. Here, since k _p =1, only one time-frequency domain index of the transmission resource needs to be determined in the period p, which is represented by t _p and f _p .

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

or,

首先根据公式(8)的 约束关系确定周期p内各次发送资源的时域索引t_p,i，然后，再根据公式(9)或(10)确定周期 p内各次发送资源的频域索引。t_p,i为周期p内第i次发送发现信号时发送资源所在子帧在 DRP内的索引，公式(9)中的f_p,i为周期p内第i次发送发现信号时发送资源所在频域资源在 整个上行带宽上的索引，公式(10)中的f_p为发送资源所在频域资源在DRP内的索引。可以根 据实际情况采取公式(9)或(10)计算确定频域资源的索引。例如，当步骤310中基站将DRP的 频域大小F及起始位置直接发送给UE时，UE可以采取公式(10)确定频域索引；当步骤310中 基站仅将资源R_PUCCH通知给UE时，UE可以采取公式(9)确定频域索引。这里，由于k_p>1，因此周 期p内需要确定出多个发送资源的时频域索引，用t_p,i和f_p,i表示。 in,

First, determine the time domain index t _p,i of each transmission resource in period p according to the constraint relationship of formula (8), and then determine the frequency domain index of each transmission resource in period p according to formula (9) or (10). . t _p,i is the index in the DRP of the subframe where the transmission resource is located when the discovery signal is sent for the i-th time in the period p, and f _p,i in formula (9) is the location of the transmission resource when the discovery signal is sent for the i-th time in the period p. The index of the frequency domain resource on the entire uplink bandwidth, f _p in the formula (10) is the index of the frequency domain resource where the transmission resource is located in the DRP. According to the actual situation, formula (9) or (10) can be used to calculate and determine the index of the frequency domain resource. For example, when the base station directly sends the frequency domain size F and the starting position of the DRP to the UE in step 310, the UE can determine the frequency domain index by using formula (10); when the base station only notifies the UE of the resource R _PUCCH in step 310 , the UE can adopt formula (9) to determine the frequency domain index. Here, since k _p >1, the time-frequency domain indices of multiple transmission resources need to be determined in the period p, which are denoted by t _p,i and f _p,i .

时，上述公式简化为：In the above formulas (8), (9) and (10), when

, the above formula simplifies to:

t_p,i为周期p内第i次发送发现 信号时发送资源所在子帧在DRP内的索引，在公式(12)中f_p,i为周期p内第i次发送发现信号 时发送资源所在频域资源在整个上行带宽上的索引，在公式(13)中f_p,i为周期p内第i次发 送发现信号时发送资源所在频域资源在DRP上的索引。 in,

t _p, i is the index in the DRP of the subframe where the transmission resource is located when the discovery signal is sent for the i-th time in period p. In formula (12), f _{p, i} is the location of the transmission resource when the discovery signal is sent for the i-th time in the period p. The index of the frequency domain resource on the entire uplink bandwidth, in formula (13), f _p,i is the index on the DRP of the frequency domain resource where the sending resource is located when the discovery signal is sent for the i-th time 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 in one of the following two ways:

然后，当k_p＝1时根据公式(5)和公式(6)或公式(7)确定周期p内发送 资源的时频域索引，当k_p>1时根据公式(8)和公式(9)或公式(10)确定周期p内发送资源的 时频域索引； 1. According to formula (3) and formula (4), determine the logical time-frequency domain index of the transmission resource in the period p and the current time

Then, when k _p =1, 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), and when k _p >1, according to formula (8) and formula (9) ) or formula (10) to determine the time-frequency domain index of the transmission resource within the period p;

2. When k _p = 1, directly determine the time-frequency domain index of the transmission resource in the period p according to formula (5), formula (6) or formula (7), and directly according to formula (8) and formula when k _p > 1 (9) or formula (10) to determine the time-frequency index of the transmission resource in the period p, where,

个发送资源在时域上不完全重叠，这样能够避免上述UE之间的半双工限制。本实施例提出的方案，在保证

个UE的发送资源在时域上不完全重叠的前提下，需要的子帧数相对更少，可以有效降低D2D发现信号对蜂窝网络信号的影响，同时能够减少无线资源的浪费。So far, this embodiment ends. In this way, the eNB can semi-statically configure the transmission resource pool DRP that can support the maximum number of users and the maximum number of transmissions. Under different times of discovery signal transmission, the used resources are concentrated, which can avoid the generation of resource fragmentation. Moreover, when the number of transmissions k is greater than 1, it can be guaranteed that

The transmission resources do not completely overlap in the time domain, so that the above-mentioned half-duplex restriction between UEs can be avoided. The solution proposed in this embodiment guarantees

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

Embodiment 2:

In this embodiment, the eNB semi-statically configures the location and the time domain size T and the frequency domain size F of the DRP through signaling. Before each discovery cycle, the eNB dynamically indicates the resource hopping range. In this embodiment, the time domain size of the resource hopping range is equal to the DRP, and the frequency domain size F′ _p ≦F. The UE determines the sending position of the discovery signal in the period p according to the above 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 location of the DRP, the number of times k of discovery signal transmission, the time domain size T and the frequency domain size F, and the initial resource indication.

Similar to the first embodiment, the frequency domain size F of the DRP may be indicated in a direct or indirect manner. In the direct mode, the eNB directly informs the UE of the start and end positions of the frequency domain resources occupied by the DRP in the DRP subframe through signaling. If it is an indirect method, the eNB indicates R _PUCCH through signaling, and R _PUCCH includes the frequency domain resources used for PUCCH transmission and PUCCH guard interval at the head or end of the uplink bandwidth. These resources cannot be used for D2D discovery signal transmission. The frequency domain size F=B _w -2×R _PUCCH , where B _w is the uplink system bandwidth.

和

另外，本实施例中每个周期的发现信号发送次数相同，利用k表示，该k为eNB半静态配置给UE的。The above signaling used to indicate the initial resource is UE-specific signaling, and the UE determines the logical 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 in each cycle is the same, which is represented by k, which is semi-statically configured by the eNB to the UE.

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

The above signaling used to indicate the resource hopping range is public signaling, and should be directed to all UEs in the cell participating in the transmission and reception of discovery signals. In this embodiment, the time domain size of the resource hopping range is equal to the DRP, and the frequency domain size F′ _p ≦F.

The value of the resource hopping range indication information in the above signaling may directly correspond to the value of _F'p . For example, the value of the bit field of the resource hopping range indication information is v, and the value of this field is the value of _F'p , that is, F' _p = v; or the DRP is divided into multiple segments in the frequency domain, the value of the resource hopping range indication information indicates the number of segments used for resource hopping, for example, the value of the resource hopping range indication information bit field is v, and the DRP After segmentation, the size of each segment is s, then F′ _p =s×v.

The value of F' _p is determined by the eNB. According to a method of the present application, the eNB determines the value of F' _p according to the total number of UEs that need to send the discovery signal in the period p. For example, if the total number of UEs that need to send discovery signals in period p is F×T/2, the eNB can set F′ _p to F/2 by adjusting the value of v. According to another method of the present application, the eNB adjusts the value of F' _p according to the uplink traffic (PUSCH transmission) in the period p. For example, if the eNB determines, according to the UE uplink buffer information reported by the UE, that the uplink traffic in period p is higher than the uplink traffic in period p-1, or if the eNB determines that DRP needs to be used in period p based on the currently received PUSCH bit error rate The resources of the subframe where the PUSCH is retransmitted, and the required amount of resources is higher than the period p-1, the eNB reduces the value of F' _p according to this information to meet the requirement of PUSCH transmission.

Γ表示N_D2D和N_UL到F′_p的映射关系，例如，F′_p＝min(N_D2D×k/T,F-N_UL)。According to the third method of the present application, the eNB comprehensively determines the value of F′ _p according to the above two factors, that is, the total number of UEs that need to send the discovery signal in the period p and the uplink traffic in the period p, that is, F′ _p = Γ(N _D2D , N _UL ), where N _D2D represents the total number of UEs that need to send discovery signals in period p, N _UL represents the resources required for uplink services in period p, and this value is estimated by the eNB to average each subframe in period p The resource N _r required for PUSCH retransmission on the PUSCH and the average resource N _n required for PUSCH new transmission on each subframe are weighted to obtain, for example

Γ represents the mapping relationship of N _D2D and N _UL to F′ _p , for example, F′ _p =min(N _D2D ×k/T,FN _UL ).

Since the resource hopping range may be different in each cycle, the logical frequency domain index determined according to the resource hopping range of the previous cycle may exceed the resource hopping range of the current cycle. Therefore, in the above case, it is necessary to obtain a new The resource indication is used for the calculation of sending resources in the current cycle and subsequent cycles. specifically:

和

则UE可以按照如下两种方式之一计算周期p的发送资源的时频域索引：If the logical frequency domain index of the UE's transmission resources in the period p-1 is greater than _F'p , the eNB should re-allocate the transmission resources to the UE before the period p, that is, the UE needs to re-acquire the transmission resource indication of the eNB. If the UE does not successfully detect the sending resource indication re-issued by the eNB before the period p, it can operate according to the actual needs, such as abandoning the calculation of the sending resources in the current period p; if before the period p, the UE successfully detects that the eNB re-downloads (It needs to be specified that the sending resource indication signaling re-issued by the eNB detected by the UE may be before or after the signaling indicating _F'p , the same below), and the resource time-frequency domain index is

and

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

1. Step 430 is performed to determine the logical time-frequency domain index sum and time-frequency domain index of the transmission resource within the period p. At this time

并将公式(9)、(10)中的F'替换为F′_p。2. When k=1, the UE determines the time-frequency domain index of the transmission resource within the period p according to formula (5) and formula (6) or formula (7). When k>1, according to formula (8) and formula (9) or Formula (10) determines the time-frequency domain index of the transmission resource within the period p, at this time

And replace F' in formulas (9) and (10) with F' _p .

If the logical frequency domain index of the resource sent by the UE in the period p-1 is not greater than F′ _p , the UE directly executes step 430 .

Step 430: The UE determines the resource location for sending the discovery signal within the period p, and sends the discovery signal.

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

或

or

或

or

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

0≤i＜k,并将公式(9)、(10)中的F'替换为F′_p。If k>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 based on the formula (8) and Formula (9) or formula (10) is determined, the difference is that at this time

0≤i<k, and replace F' in formulas (9) and (10) with F' _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 in one of the following two ways:

和

此时

然后，当k＝1时根据公式(5)和公式(6)或公式(7)确定周期p内发送资源的时频域索引，当k>1时根据公式(8)和公式(9)或公式(10)确定周期p内发送资源的时频域索引,并将公式(9)、(10)中的F'替换为F′_p；1. Determine the logical time-frequency domain index of the transmission resource within the period p according to formula (14) and formula (15)

and

at this time

Then, when k=1, 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), and when k>1, according to formula (8) and formula (9) or Formula (10) determines the time-frequency domain index of the transmission resource in the period p, and replaces F' in formulas (9) and (10) with _F'p ;

并将公式(9)、(10)中的F'替换为F′_p。2. When k=1, directly determine the time-frequency domain index of the transmission resource in the period p according to formula (5), formula (6) or formula (7), and directly according to formula (8) and formula (9) when k>1 ) or formula (10) to determine the time-frequency domain index of the transmission resource within the period p, where,

And replace F' in formulas (9) and (10) with F' _p .

So far, this embodiment ends. According to this method, the eNB can dynamically adjust the resource hopping range in the frequency domain according to the number of UEs currently applying for resource discovery, and can use radio resources more efficiently.

Embodiment three:

In this embodiment, the eNB semi-statically configures the location and the time domain size T of the DRP and the frequency domain size F of the DRP through signaling. The number of times the discovery signal is sent may change during each discovery cycle. The UE determines the sending position of the discovery signal in the period p according to the above parameters and the number of times k _p of discovery signal transmission in the current period, and the specific steps are as follows:

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

Similar to the first embodiment, the frequency domain size F of the DRP may be indicated in a direct or indirect manner. In the direct mode, the eNB directly informs the UE of the start and end positions of the frequency domain resources occupied by the DRP in the DRP subframe through signaling. If it is an indirect method, the eNB indicates R _PUCCH through signaling, and R _PUCCH includes the frequency domain resources used for PUCCH transmission and PUCCH guard interval at the head or end of the uplink bandwidth. These resources cannot be used for D2D discovery signal transmission. The frequency domain size F=B _w -2×R _PUCCH , where B _w is the uplink system bandwidth.

和

The above signaling used to indicate the initial resource is UE-specific signaling, and the UE determines the logical time-frequency domain position of the initial transmission resource through the initial resource indication

and

Step 520: The UE receives the eNB signaling, determines the number of times k _p of discovery signal transmission in the period p, and further determines the frequency domain size of the resource hopping range in the period p.

The above-mentioned signaling for indicating k _p is public signaling, and should be directed to all UEs in the cell participating in the transmission and reception of discovery signals. The time domain size of the resource hopping range is the same as that of the DRP, and the frequency domain sizes F′ _p and k _p satisfy the following constraints:

Since the resource hopping range and the number of transmissions k _p may be different in each cycle, the logical frequency domain index determined according to the resource hopping range of the previous cycle may exceed the resource hopping range of the current cycle. Therefore, it is necessary to obtain the The new resource indication is used for the calculation of sending resources in the current cycle and subsequent cycles. specifically:

和

则UE可以按照如下两种方式之一计算周期p的发送资源的时频域索引：If the logical frequency domain index of the UE's transmission resources in the period p-1 is greater than _F'p , the eNB should re-allocate the transmission resources to the UE before the period p, that is, the UE needs to re-acquire the transmission resource indication of the eNB. If the UE does not successfully detect the sending resource indication re-issued by the eNB before the period p, it can operate according to the actual needs, such as abandoning the calculation of the sending resources in the current period p; if before the period p, the UE successfully detects that the eNB re-downloads sent resource indication, and the resource time-frequency domain index is

and

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

和

以及时频域索引，此时

1. Step 530 is executed to determine the logical time-frequency domain index of the transmission resource when the discovery signal is sent each time in the period p

and

and the time-frequency domain index, at this time

和

根据公式(18)和(19)确定，并将公式(5)、(6)、(7)中的t_p、

f_p和

分别替换为t_p,i、

fp,i和

2. The UE directly determines the time-frequency domain index of the transmission resource within the period p according to formula (5), formula (6) or formula (7).

and

Determined according to formulas (18) and (19), and t _p ,

f _p and

are replaced by t _p,i ,

fp,i and

Step 530: The UE determines the resource location for sending the discovery signal within the period p, and sends the discovery signal.

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

或

(16)，

or

(16),

或

(17)。

or

(17).

The UE determines the logical time-frequency domain index of the transmission resource used to repeatedly transmit the discovery signal within the period p according to the following formula:

或

or

或(19)。

or (19).

fp和

分别替换为t_p,i、

f_p,i和

其中，0≤i<k_p。where 0<j<k _p ; 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 _p ,

fp and

are replaced by t _p,i ,

f _{p, i} and

where 0≤i<k _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 in one of the following two ways:

和 1. Determine the logical time-frequency domain index and time-frequency domain index of each transmission resource in the period p according to formulas (16) to (19). Then, according to formula (5) and formula (6) or formula (7) ) determine the time-frequency domain index of the transmission resource in the period p, and replace F', t _p , fp in the corresponding formula with

and

和

根据公式(18)和(19)确定，并将公式(5)、(6)、(7)中的t_p、

fp和

分别替换t_p,i、

f_p,i和

2. Determine the time-frequency domain index of the transmission resource within the period p directly according to formula (5), formula (6) or formula (7).

and

Determined according to formulas (18) and (19), and t _p ,

fp and

respectively replace t _p,i ,

f _{p, i} and

So far, this embodiment ends. According to this method, the eNB can dynamically adjust the number of times of sending the discovery signal according to the number of UEs currently applying for discovery resources, so as to make full use of the radio resources in the DRP. Compared with the first embodiment, for different transmission times, a unified resource hopping method can be used to determine the transmission resources of the UE, and the implementation is relatively simple, but this solution requires F' _p ≤ T, otherwise the discovery signal of a UE may be sent multiple times. The transmission resources may appear in the same subframe, which limits the application scope of this scheme to a certain extent.

Embodiment 4:

In this embodiment, the eNB semi-statically configures the location of the DRP and the time domain size T and the frequency domain size F through signaling. At the same time, 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 determines the sending position of the discovery signal in the period p according to the above parameters and the number of times k _p of discovery signal transmission in the current period, and the specific steps are as follows:

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

Similar to the first embodiment, the frequency domain size F of the DRP may be indicated in a direct or indirect manner. In the direct mode, the eNB directly informs the UE of the start and end positions of the frequency domain resources occupied by the DRP in the DRP subframe through signaling. If it is an indirect method, the eNB indicates R _PUCCH through signaling, and R _PUCCH includes the frequency domain resources used for PUCCH transmission and PUCCH guard interval at the head or end of the uplink bandwidth. These resources cannot be used for D2D discovery signal transmission. The frequency domain size F=B _w -2×R _PUCCH , where B _w is the uplink system bandwidth.

和

The above signaling used to indicate the initial resource is UE-specific signaling, and the UE determines the logical time-frequency domain position of the initial transmission resource through the initial resource indication

and

Step 620: The UE receives the eNB signaling, determines the number of times k _p of discovery signal transmission in the period p, and further determines the frequency domain size F' _p of the resource hopping range.

The above signaling is public signaling, and should be directed to all UEs in the cell participating in the transmission and reception of discovery signals. The time domain size of the resource hopping range is the same as that of the DRP, and the frequency domain sizes F′ _p and k _p satisfy the following constraints:

Since the resource hopping range and the number of transmissions k _p may be different in each cycle, the logical frequency domain index determined according to the resource hopping range of the previous cycle may exceed the resource hopping range of the current cycle. Therefore, it is necessary to obtain the The new resource indication is used for the calculation of sending resources in the current cycle and subsequent cycles. specifically:

和

则UE可以按照如下两种方式之一计算周期p的发送资源的时频域索引：If the logical frequency domain index of the UE's transmission resources in the period p-1 is greater than _F'p , the eNB should re-allocate the transmission resources to the UE before the period p, that is, the UE needs to re-acquire the transmission resource indication of the eNB. If the UE does not successfully detect the sending resource indication re-issued by the eNB before the period p, it can operate according to the actual needs, such as abandoning the calculation of the sending resources in the current period p; if before the period p, the UE successfully detects that the eNB re-downloads sent resource indication, and the resource time-frequency domain index is

and

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

1. Perform step 630 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

并将公式(9)、(10)中的F'替换为F′_p。2. When k _p = 1, the UE determines the time-frequency domain index of the transmission resource within the period p according to formula (5) and formula (6) or formula (7). When k _p > 1, according to formula (8) and formula (9) ) or formula (10) to determine the time-frequency domain index of the transmission resource within the period p, at this time

And replace F' in formulas (9) and (10) with F' _p .

Step 630: The UE determines the resource location for sending the discovery signal within the period p, and sends the discovery signal.

If k _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 formula (15) in the second embodiment, and further according to the formula (5) and formula (6) in the first embodiment ) or formula (7) to determine the time-frequency domain index of the transmission resource within the period p.

并将公式(9)、(10)中的F'替换为F′_p。If k _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 according to the first embodiment. Formula (8) and formula (9) or formula (10) are determined, the difference is that at this time

And replace F' in formulas (9) and (10) with F' _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 in one of the following two ways:

和

此时

然后，当k_p＝1时根据公式(5)和公式(6)或公式(7)确定周期p内发送资源的时频域索引，当k_p>1时根据公式(8)和公式(9)或公式(10)确定周期p内发送资源的时频域索引,并将公式(9)、(10)中的F'替换为F′_p；1. Determine the logical time-frequency domain index of the transmission resource within the period p according to formula (14) and formula (15)

and

at this time

Then, when k _p =1, 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), and when k _p >1, according to formula (8) and formula (9) ) or formula (10) to determine the time-frequency domain index of the transmission resource in the period p, and replace F' in formulas (9) and (10) with _F'p ;

并将公式(9)、(10)中的F'替换为F′_p。2. When k _p = 1, directly determine the time-frequency domain index of the transmission resource in the period p according to formula (5), formula (6) or formula (7), and directly according to formula (8) and formula when k _p > 1 (9) or formula (10) to determine the time-frequency domain index of the transmission resource within the period p, where,

And replace F' in formulas (9) and (10) with F' _p .

个UE的发送资源在时域上不完全重叠，这样能够避免上述UE之间的半双工限制。和实施例一相比，因为资源跳变范围能够随着当前能够支持的用户数而动态调整，有利于降低实现的复杂度。So far, this embodiment ends. In this way, the eNB can dynamically change the number of times the discovery signal is sent according to the current network environment and the number of users applying for discovery resources. Moreover, when the number of transmissions k is greater than 1, it can be guaranteed that

The transmission resources of the UEs do not completely overlap in the time domain, which can avoid the above-mentioned half-duplex restriction between UEs. Compared with the first embodiment, because the resource hopping range can be dynamically adjusted with the number of users currently supported, it is beneficial to reduce the complexity of implementation.

Embodiment 5:

In this embodiment, the eNB semi-statically configures the location and the time domain size T and the frequency domain size F of the DRP through signaling. Before each discovery cycle, the eNB dynamically indicates the resource hopping range. In this embodiment, the frequency domain size of the resource hopping range is equal to the DRP, and the time domain size T′ _p ≦T. The UE determines the sending position of the discovery signal in the period p according to the above 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 location of the DRP, the number of times k of discovery signal transmissions k, the time domain size T and the frequency domain size F, and the initial resource indication.

Similar to the first embodiment, the frequency domain size F of the DRP may be indicated in a direct or indirect manner. In the direct mode, the eNB directly informs the UE of the start and end positions of the frequency domain resources occupied by the DRP in the DRP subframe through signaling. If it is an indirect method, the eNB indicates R _PUCCH through signaling, and R _PUCCH includes the frequency domain resources used for PUCCH transmission and PUCCH guard interval at the head or end of the uplink bandwidth. These resources cannot be used for D2D discovery signal transmission. The frequency domain size F=B _w -2×R _PUCCH , where B _w is the uplink system bandwidth.

和

另外，本实施例中每个周期的发现信号发送次数相同，利用k表示，该k为eNB半静态配置给UE的。The above signaling used to indicate the initial resource is UE-specific signaling, and the UE determines the logical 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 in each cycle is the same, which is represented by k, which is semi-statically configured by the eNB to the UE.

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

The above signaling used to indicate the resource hopping range is public signaling, and should be directed to all UEs in the cell participating in the transmission and reception of discovery signals. In this embodiment, the frequency domain size of the resource hopping range is equal to the DRP, and the time domain size T′ _p ≦T.

The value of the resource hopping range indication information in the above signaling may directly correspond to the value of _T'p . For example, the value of the bit field of the resource hopping range indication information is v, and the value of this field is the value of _T'p , that is, T′ _p = v; or the DRP is divided into multiple segments in the time domain, the value of the resource hopping range indication information indicates the number of segments of resources used for resource hopping, for example, the value of the resource hopping range indication information bit field is v, and the DRP After segmentation, the size of each segment is s, then T′ _p =s×v.

The value of T′ _p is determined by the eNB. According to a method of the present application, the eNB determines the value of T′ _p according to the total number of UEs that need to send the discovery signal in the period p. For example, if the total number of UEs that need to send discovery signals in period p is F×T/2, the eNB can set T′ _p to T/2 by adjusting the value of v. According to another method of the present application, the eNB adjusts the value of T′ _p according to the uplink traffic (PUSCH transmission) in the period p. For example, if the eNB determines, according to the UE uplink buffer information reported by the UE, that the uplink traffic in period p is higher than the uplink traffic in period p-1, or if the eNB determines that DRP needs to be used in period p based on the currently received PUSCH bit error rate The resources of the subframe where the PUSCH is retransmitted, and the required amount of resources is higher than the period p-1, the eNB reduces the value of T' _p according to this information to meet the requirements of PUSCH transmission.

Γ表示M_D2D和M_UL到T′_p的映射关系，例如，T′_p＝min(M_D2D×k/F,T-M_UL)。According to the third method of the present application, the eNB comprehensively determines the value of T′ _p according to the above two factors, that is, the total number of UEs that need to send the discovery signal in the period p and the uplink traffic volume in the period p, that is, T′ _p = Γ(M _D2D , M _UL ), where N _D2D represents the total number of UEs that need to send discovery signals in period p, M _UL represents the resources required for uplink services in period p, and this value is determined by PUSCH retransmission in period p estimated by the eNB. The required subframes M _r and the number of subframes required for PUSCH new transmission M _n are weighted to obtain, for example

Γ represents the mapping relationship of M _D2D and M _UL to T′ _p , for example, T′ _p =min( _MD2D ×k/F,TM _UL ).

Since the resource hopping range may be different in each cycle, the logical frequency domain index determined according to the resource hopping range of the previous cycle may exceed the resource hopping range of the current cycle. Therefore, in the above case, it is necessary to obtain a new The resource indication is used for the calculation of sending resources in the current cycle and subsequent cycles. specifically:

和

则UE可以按照如下两种方式之一计算周期p的发送资源的时频域索引：If the logical time domain index of the UE's transmission resources in the period p-1 is greater than _T'p , the eNB should re-allocate the transmission resources to the UE before the period p, that is, the UE needs to re-acquire the transmission resource indication of the eNB. If the UE does not successfully detect the sending resource indication re-issued by the eNB before the period p, it can operate according to the actual needs, such as abandoning the calculation of the sending resources in the current period p; if before the period p, the UE successfully detects that the eNB re-downloads (It needs to be specified that the sending resource indication signaling re-issued by the eNB detected by the UE may be before or after the signaling indicating _T'p , the same below), and the resource time-frequency domain index is

and

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

1. Step 730 is executed to determine the logical time-frequency domain index sum and time-frequency domain index of the transmission resource within the period p. At this time,

并将公式(9)、(10)中的T替换为T′_p，F′_p替换为F。2. When k=1, the UE determines the time-frequency domain index of the transmission resource within the period p according to formula (5) and formula (6) or formula (7). When k>1, according to formula (8) and formula (9) or Formula (10) determines the time-frequency domain index of the transmission resource within the period p, at this time

And replace T in formulas (9) and (10) with T′ _p , and F′ _p with F.

则UE直接执行步骤730。If the logical time domain index of the resource sent by the UE in the cycle p-1 is not greater than _T'p and k=1, or, k>1 and the UE sends the index corresponding to the resource in the cycle p-1

Then the UE directly executes step 730.

则eNB应在周期p之前重新为该UE分配发送资源，即UE需要重新获取eNB的发送资源指示。如果在周期p之前，UE未成功检测到eNB重新下发的发送资源指示，UE根据实际需求进行操作，例如放弃当前周期p的发送资源计算；如果在周期p之前，UE成功检测到eNB重新下发的发送资源指示，且资源时频域索引为

和

则UE可以按照如下两种方式之一计算周期p的发送资源的时频域索引：If the logical time domain index of the resource sent by the UE in cycle p-1 is not greater than T′ _p , but k> ₁ , and the UE sends the index corresponding to the resource in cycle p-1

Then the eNB should re-allocate the sending resource to the UE before the period p, that is, the UE needs to re-acquire the sending resource indication of the eNB. If the UE does not successfully detect the sending resource indication re-issued by the eNB before the period p, the UE performs operations according to the actual needs, such as giving up the calculation of the sending resources of the current period p; if before the period p, the UE successfully detects that the eNB re-downloads the resource sent resource indication, and the resource time-frequency domain index is

and

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

1. Step 730 is executed to determine the logical time-frequency domain index sum and time-frequency domain index of the transmission resource within the period p. At this time,

并将公式(9)、(10)中的T替换为T′_p，F′_p替换为F。2. When k=1, the UE determines the time-frequency domain index of the transmission resource within the period p according to formula (5) and formula (6) or formula (7). When k>1, according to formula (8) and formula (9) or Formula (10) determines the time-frequency domain index of the transmission resource within the period p, at this time

And replace T in formulas (9) and (10) with T′ _p , and F′ _p with F.

Step 730: The UE determines the resource location for sending the discovery signal within the period p, and sends the discovery signal.

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

或

or

或

or

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

0≤i＜k,并将公式(9)、(10)中的T替换为T′_p，F′_p替换为F。If k>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 based on the formula (8) and Formula (9) or formula (10) is determined, the difference is that at this time

0≤i<k, and replace T in formulas (9) and (10) with T′ _p , and F′ _p with F.

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 in one of the following two ways:

和

此时

然后，当k＝1时根据公式(5)和公式(6)或公式(7)确定周期p内发送资源的时频域索引，当k>1时根据公式(8)和公式(9)或公式(10)确定周期p内发送资源的时频域索引,并将公式(9)、(10)中的T替换为T′_p，F′_p替换为F；1. Determine the logical time-frequency domain index of the transmission resource within the period p according to formula (14) and formula (15)

and

at this time

Then, when k=1, 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), and when k>1, according to formula (8) and formula (9) or Formula (10) determines the time-frequency domain index of the transmission resource in the period p, and replaces T in formulas (9) and (10) with T′ _p , and F′ _p with F;

并将公式(9)、(10)中的T替换为T′_p，F′_p替换为F。2. When k=1, directly determine the time-frequency domain index of the transmission resource in the period p according to formula (5), formula (6) or formula (7), and directly according to formula (8) and formula (9) when k>1 ) or formula (10) to determine the time-frequency domain index of the transmission resource within the period p, where,

And replace T in formulas (9) and (10) with T′ _p , and F′ _p with F.

So far, this embodiment ends. According to this method, the eNB can dynamically adjust the resource hopping range in the time domain according to the number of UEs that discover resources in the current period, and can use radio resources more efficiently.

The above is the specific implementation of the method for sending a D2D discovery signal in the present application, and the present application also provides a device for sending a D2D discovery signal, which can be used to implement the above method. FIG. 3 is a schematic diagram of a specific structure of the sending device in the present application. As shown in FIG. 3 , the apparatus includes: a resource pool determination unit, a transmission resource determination unit, and a signal transmission unit.

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

The sending resource determination unit is used to determine, before each cycle p, the range of resource hopping in the corresponding cycle and the number of times k _p of D2D discovery signal sending; The range and the initial resource allocation indication determine the logical time-frequency domain index for sending the D2D discovery signal within the period p, and then determine the D2D discovery signal to be sent within the period p according to the logical time-frequency domain index and k _p in the corresponding period time-frequency domain index.

A signal sending unit, configured to send the D2D discovery signal at the resource position indicated by the time-frequency domain index (t _p , f _p ) in the DRP in each period p.

Among them, t _p is the index in the DRP of the subframe where the transmission resources for sending D2D discovery signals in period p are located, and f _p is the frequency domain resources where the transmission resources for transmitting D2D discovery signals in period p are located on the entire uplink bandwidth or in the Indexes within the DRP.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection.

Claims (48)

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;

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 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 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 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

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

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;

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

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

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

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

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

8. The method according to claim 3 or 4, wherein, 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.

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;

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,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

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 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.

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;

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 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;

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

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;

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

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

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

21. The method of claim 18, wherein 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.

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;

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:

wherein, 0<j<k_p。

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

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_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,

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.

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;

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

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

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

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.

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;

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 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

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

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

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

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

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

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

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

32. The apparatus according to claim 27 or 28, wherein 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.

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

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;

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

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,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.

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

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

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,

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.

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，

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 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

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

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

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;

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:

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

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 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,

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

44. The apparatus of claim 43, wherein 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.

45. The apparatus of claim 42, wherein 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.

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,

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 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,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,

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

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

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.

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