CN104184540A

CN104184540A - Data transmission method and apparatus in device-to-device (D2D) communication

Info

Publication number: CN104184540A
Application number: CN201310195469.0A
Authority: CN
Inventors: 赵锐; 高秋彬; 陈文洪; 彭莹; 张然然
Original assignee: China Academy of Telecommunications Technology CATT
Current assignee: China Academy of Telecommunications Technology CATT; Datang Mobile Communications Equipment Co Ltd
Priority date: 2013-05-23
Filing date: 2013-05-23
Publication date: 2014-12-03
Anticipated expiration: 2033-05-23
Also published as: WO2014187336A1; CN104184540B; TWI516161B; TW201446069A

Abstract

The embodiment of the invention discloses a data transmission method and apparatus in device-to-device (D2D) communication, relating to the field of wireless communication, used for solving the problem how each D2D terminal in the same D2D communication group utilizes D2D communication resource for carrying out data transceiver. In the scheme, a network side apparatus receives resource occupying request transmitted by at least one D2D terminal in the same D2D communication group, determines the D2D communication resource corresponding to the D2D communication group; determines a resource position in the D2D communication resource of the transmission resource of each D2D terminal in the D2D communication group according to the received resource occupying request; informs the resource position of the transmission resource of each D2D terminal to the corresponding D2D terminal, and the D2D terminal carries out data transmission on the transmission resource of the D2D terminal according to the information. Hence the scheme solves the problem how each D2D terminal in the same D2D communication group utilizes D2D communication resource for carrying out data transceiver.

Description

Data transmission method and equipment in D2D communication

Technical Field

The present invention relates to the field of wireless communications, and in particular, to a data transmission method and device in D2D communication.

Background

For convenience of description, a Device-to-Device (D2D) (also referred to as a terminal-through) communication system under control of a cellular Network defines a communication link between D2D terminals as D2Dlink (Device-to-Device link) and a cellular communication link between the Network and D2D terminals as N2Dlink (Network-to-Device link), as shown in fig. 1.

For the D2D data transmission process, the following considerations are taken into consideration whether an uplink carrier (Frequency division duplex (FDD) system)/an uplink subframe (Time division duplex (TDD) system) is adopted, or a downlink carrier (FDD system)/a downlink subframe (TDD system) is adopted: for a downlink subframe/downlink carrier, a terminal (User Equipment, UE) needs to receive data (including at least data of a Physical Downlink Control Channel (PDCCH)) transmitted on the base station side N2D link and transmit data on a D2D link, so that the UE needs to perform transmit-receive conversion after receiving the PDCCH, and needs to receive a plurality of columns of Cell-specific pilot signals (CRS) for demodulation of the PDCCH, so as to obtain better PDCCH demodulation performance, and therefore, considering time for transmit-receive conversion, fewer Orthogonal Frequency Division Multiplexing (OFDM) symbols are available for D2D link transmission in the downlink subframe/downlink carrier. And thus tends to employ uplink subframes/uplink carriers as resources for D2D data transmission.

In general, for a group of D2D terminals, the network side configures, semi-statically, shared time-frequency resources for D2D communication (D2D link) for the group of D2D terminals, which may be a configuration of a subframe (time domain) + a Physical Resource Block (PRB) (frequency domain).

In the conventional cellular communication technology, a data communication flow between two terminals is shown in fig. 2. The voice and data services of the two terminals are interacted through the base station (eNB) and the core network where the two terminals reside respectively.

D2D is a way that a neighboring terminal can perform data transmission through a direct link in a short distance without forwarding through a central node (i.e., a base station), as shown in fig. 3. The short-range communication characteristic and the direct communication mode of the D2D technology have the following advantages: the terminal short-distance direct communication mode can realize higher data rate, lower delay and lower power consumption; the effective utilization of frequency spectrum resources can be realized by utilizing the characteristics of widely distributed user terminals in the network and the short distance of the D2D communication link; the direct communication mode of the D2D can adapt to the local data sharing requirement of the service such as wireless P2P and the like, and provides data service with flexible adaptability; D2D direct communication enables the use of a large number and wide distribution of communication terminals in a network to extend the coverage of the network.

In summary, there is no specific implementation scheme for how each D2D terminal belonging to the same D2D communication group utilizes D2D communication resources to perform data transceiving.

Disclosure of Invention

The embodiment of the invention provides a data transmission method and equipment in D2D communication, which are used for solving the problem of how to utilize D2D communication resources to carry out data transceiving by each D2D terminal in the same D2D communication group.

A method of data transmission in a device-to-device, D2D, communication, the method comprising:

after receiving a resource occupation request sent by at least one D2D terminal in the same D2D communication group each time, the network side equipment determines a D2D communication resource corresponding to the D2D communication group, and determines the resource position of transmission resources of each D2D terminal in the D2D communication group according to the received resource occupation request, wherein the transmission resources of each D2D terminal are located in the D2D communication resource; the transmission resources comprise transmission resources and/or reception resources;

and the network side equipment notifies the resource position of the transmission resource of each D2D terminal in the D2D communication group to the corresponding D2D terminal so as to instruct the corresponding D2D terminal to transmit data on the notified transmission resource.

the D2D terminal receives the notification of the resource position of the transmission resource of the D2D terminal sent by the network side equipment; the D2D terminal is a D2D terminal in the D2D communication group, and the notification is a notification of the resource location of the transmission resource of the D2D terminal, which is determined in the D2D communication resource corresponding to the D2D communication group according to the received resource occupation request after the network side device receives the resource occupation request sent by at least one D2D terminal in the D2D communication group; the transmission resources comprise transmission resources and/or reception resources;

and the D2D terminal transmits data on the transmission resource of the D2D terminal according to the notification.

A base station, the base station comprising:

the resource determining unit is used for determining the D2D communication resources corresponding to the D2D communication group after receiving a resource occupation request sent by at least one D2D terminal in the same D2D communication group each time;

a location determining unit, configured to determine, according to the received resource occupation request, a resource location of a transmission resource of each D2D terminal within the D2D communication group, wherein the transmission resource of each D2D terminal is located in the D2D communication resource; the transmission resources comprise transmission resources and/or reception resources;

a location notification unit, configured to notify the resource location of the transmission resource of each D2D terminal in the D2D communication group to the corresponding D2D terminal, so as to instruct the corresponding D2D terminal to perform data transmission on the notified transmission resource.

A D2D terminal, the D2D terminal comprising:

a location notification receiving unit, configured to receive a notification of a resource location of a transmission resource of the D2D terminal sent by the network side device; the D2D terminal is a D2D terminal in the D2D communication group, and the notification is a notification of the resource location of the transmission resource of the D2D terminal, which is determined in the D2D communication resource corresponding to the D2D communication group according to the received resource occupation request after the network side device receives the resource occupation request sent by at least one D2D terminal in the D2D communication group; the transmission resources comprise transmission resources and/or reception resources;

and the data transmission unit is used for carrying out data transmission on the transmission resource of the D2D terminal according to the notification.

In the scheme, after receiving a resource occupation request sent by at least one D2D terminal in the same D2D communication group each time, the network side device determines the D2D communication resource corresponding to the D2D communication group, determines the resource position of the transmission resource of each D2D terminal in the D2D communication group in the D2D communication resource according to the received resource occupation request, notifies the corresponding D2D terminal of the resource position of the transmission resource of each D2D terminal, and after receiving the notification of the resource position of the transmission resource of the D2D terminal sent by the network side device, the D2D terminal performs data transmission on the transmission resource of the D2D terminal according to the notification, including data transmission and/or data reception. Therefore, the scheme solves the problem of how to utilize the D2D communication resources to transmit and receive data by each D2D terminal in the same D2D communication group.

Drawings

FIG. 1 is a schematic representation of a prior art N2D link and D2D link;

fig. 2 is a data flow diagram illustrating terminal communication in a cellular network according to the prior art;

fig. 3 is a schematic data flow diagram of a terminal direct connection communication in the prior art;

fig. 4a is a schematic diagram of a semi-static unidirectional resource allocation manner of D2D communication according to an embodiment of the present invention;

fig. 4b is a schematic diagram illustrating a semi-static bidirectional resource allocation manner of D2D communication according to an embodiment of the present invention;

FIG. 5 is a schematic flow chart of a method provided by an embodiment of the present invention;

FIG. 6 is a schematic flow chart of another method provided by the embodiments of the present invention;

fig. 7 is a schematic diagram illustrating an interaction flow between a network side and a terminal side according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a base station according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a terminal according to an embodiment of the present invention.

Detailed Description

The LTE D2D technology refers to LTE network controlled D2D communications operating on LTE licensed bands. On one hand, the advantages of the D2D technology can be fully utilized, and meanwhile, the control of the LTE network can also overcome some problems of the conventional D2D technology, such as uncontrollable interference and the like. The introduction of LTE D2D features will advance the LTE technology from pure wireless mobile cellular communication technology towards Universal connectivity technology (Universal connectivity technology).

Introducing D2D communication onto the licensed band of LTE, the D2D communication link will share radio resources with cellular communication, which is also the most fundamental issue for merging D2D communication technologies in cellular systems. The sharing of radio resources can be divided into two types: orthogonal sharing and multiplexing sharing. The orthogonal method for sharing radio resources means that radio resources are divided into orthogonal parts in a static or dynamic manner in terms of radio resource usage, and orthogonal resources are used for cellular communication and D2D communication. The sharing of the wireless resources in a multiplexing mode means that the D2D communication shares and reuses the cellular resources being used in a reasonable mode, and limits the interference within a certain level range.

In the D2D communication, besides the one-to-one communication method between users, a typical application scenario also includes group/broadcast communication between D2D users, which can be implemented as follows:

a UE transmits the same data by a single transmission to all UEs in a communication group (group communication);

one UE transmits the same data (broadcast communication) through a single transmission to all nearby UEs authorized.

The group/broadcast communication scenario may be used for fire, rescue, anti-terrorism, etc. in public safety applications.

A Scheduling Request (SR) is used to Request a base station to schedule UE for Uplink transmission, and in a Long Term Evolution (Long Term Evolution, LTE)/Long Term Evolution-Advanced (Long Term Evolution-Advanced, LTE-a) system, the base station configures a dedicated periodic SR resource for the UE entering a Radio Resource Control (RRC) connection state, and a corresponding Physical Channel is a resource of a Physical Uplink Control Channel (PUCCH) format (format) 1/1a/1 b.

The Buffer Status Report (BSR) is used to Report the size of data volume contained in a Buffer for current uplink transmission of the UE, and is used to assist the base station in scheduling resource allocation for uplink transmission of the UE. Two BSRs are defined in a Medium Access Control (MAC) layer, respectively: the long BSR reports buffer state information of 4 logic channel groups, and the short BSR only reports the BSR of one logic channel group. The reporting of BSR is triggered by events such as: the data arrival with high priority or the event such as the timeout of the periodic BSR reporting timer can be performed. The BSR is carried over PUSCH scheduled by the base station.

From the perspective of D2D terminal receiving/transmitting, there are the following time-frequency resource allocation methods for D2D communication:

the method comprises the following steps: the unidirectional resource allocation method may be configured as the time-frequency resource transmitted by the D2D terminal or may be configured as the time-frequency resource received by the D2D terminal for a given time-frequency resource, as shown in fig. 4 a. The unidirectional resource configuration may be modified by higher layer signaling (reconfiguration procedure). The method is a semi-static resource allocation method, and has the advantages of simplicity, but the main problem of the method is that the time delay of reconfiguration is large, and the method cannot adapt to the dynamic change of services, so that the resource utilization rate is low.

The method 2 comprises the following steps: the bidirectional resource allocation method is that for a given time frequency resource, the given time frequency resource is allocated to a time frequency resource shared by the D2D terminal for sending/receiving, and the D2D terminal occupies the current time frequency resource in a competitive mode on the given time frequency resource. As shown in fig. 4 b. The same time-frequency resource can be configured for receiving and transmitting of a pair/group of D2D terminals, and the D2D terminal needs to occupy the current time-frequency resource for data transmission in a contention manner in the currently configured time-frequency resource. The advantage of this approach is that the resource utilization is high, multiple users share the same time-frequency resource, and the disadvantage is that contention for resource occupation between D2D terminals needs to be resolved in each D2D subframe.

The application provides a data transmission method capable of improving the resource utilization rate of a system and avoiding resource competition of a D2D terminal in each D2D subframe.

Referring to fig. 5, an embodiment of the present invention is directed to a data transmission method in D2D communication provided by a network side, including the following steps:

step 50: after receiving a resource occupation request sent by at least one D2D terminal in the same D2D communication group each time, the network side equipment determines a D2D communication resource corresponding to the D2D communication group, and determines the resource position of transmission resources of each D2D terminal in the D2D communication group according to the received resource occupation request, wherein the transmission resources of each D2D terminal are located in the D2D communication resource; the transmission resources comprise transmission resources and/or reception resources; here, the D2D communication resource corresponding to the D2D communication group refers to a D2D communication resource shared by all D2D terminals in the D2D communication group;

step 51: the network side device notifies the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal in the D2D communication group, and instructs the corresponding D2D terminal to perform data transmission on the notified transmission resource.

Specifically, the resource occupation request sent by the D2D terminal may include: the D2D terminal sends a Scheduling Request (SR) on a dedicated SR resource configured for the D2D link by the network side, where the SR is used to indicate that the D2D terminal needs to transmit data on the D2D link; or, the D2D terminal sends an SR on a dedicated SR resource configured for the D2D link by the network side, where the SR is used to indicate that the D2D terminal needs to transmit data on the D2D link, and the D2D terminal sends a Buffer Status Report (BSR) for D2D communication on a Physical Uplink Shared Channel (PUSCH) resource scheduled by the network side, where the BSR is used to indicate an amount of data that the D2D terminal currently needs to transmit on the D2D link; or, the BSR for D2D communication sent by the D2D terminal on the PUSCH resource scheduled by the network side is used to indicate the amount of data that the D2D terminal currently needs to transmit on the D2D link.

Here, the dedicated SR resource configured for the D2D link by the D2D terminal on the network side refers to a resource configured for the D2D terminal on the network side and only used for the D2D terminal to transmit an SR through the D2D link.

The network side needs to configure a dedicated SR resource for each D2D terminal in the system. Different dedicated SR resources need to be configured for D2D terminals within the same group, so that different D2D terminals can be distinguished. The frequency domain location of its dedicated SR resource may be the same or different for D2D terminals within different groups, but the time location needs to be different. The dedicated SR resource may occupy the resource of the Physical Uplink Control Channel (PUCCH) format (format) 1/1a/1 b.

Specifically, in step 50, the network side device determines the D2D communication resource corresponding to the D2D communication group, and the specific implementation may adopt the following two ways:

firstly, the network side device determines the communication resource pre-allocated to the D2D communication group as the D2D communication resource corresponding to the D2D communication group; here, the allocating of the communication resource to the D2D communication group in advance is performed before step 50, and preferably, the network side device may also notify each D2D terminal in the D2D communication group of the D2D communication resource corresponding to the D2D communication group.

Secondly, the network side device allocates the D2D communication resources corresponding to the D2D communication group according to the received resource occupancy request, for example, the network side device receives the resource occupancy requests sent by three D2D terminals, determines the number of D2D subframes in a certain period, takes a radio frame as an example (taking an LTE system as an example, one radio frame includes 10 subframes), and if it is determined that 2D 2D subframes for sending data need to be allocated in one radio frame for corresponding D2D terminals according to the resource occupancy requests sent by each D2D terminal, then it may allocate D2D communication resources including 6D 2D subframes in one radio frame for the D2D communication group. Preferably, the network side device may further notify each D2D terminal in the D2D communication group of the D2D communication resource corresponding to the D2D communication group.

In step 50, determining the resource location of the transmission resource of each D2D terminal in the D2D communication group according to the received resource occupation request, which may specifically be: determining the resource position of the transmission resource of each D2D terminal in the D2D communication group in the minimum indication period according to the received resource occupation request; correspondingly, in step 51, the network side device notifies the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal in the D2D communication group, so as to instruct the corresponding D2D terminal to perform data transmission on the notified transmission resource, which is specifically implemented as: the network side equipment notifies the resource position of the transmission resource of each D2D terminal in the D2D communication group in one minimum indication period to the corresponding D2D terminal so as to indicate the corresponding D2D terminal to perform data transmission on the transmission resource indicated by the notification in at least one subsequent minimum change period; wherein each minimum modification period comprises L minimum indication periods, and L is an integer not less than 1.

Preferably, each minimum indication period includes M subframes, and the M subframes include M1D 2D subframes, where M is an integer greater than 1 and M1 is an integer not less than 1. Preferably, M may be an integer multiple of the number of subframes included in a radio frame of the LTE system (equivalent to an integer multiple of 10 subframes).

Wherein, the minimum change period indicates that the position of the transmission resource of the D2D terminal in the D2D communication resource is not changed in at least one minimum change period. It may be N subframes in time, where N subframes may include N1D 2D subframes.

The minimum indication period represents a period of a pattern of transmission resources in the D2D communication resources indicated by the network side signaling, and may include M subframes in time, where M subframes may include M1D 2D subframes.

The relationship between the minimum change period and the minimum indication period is as follows: a minimum change period may include L minimum indication periods, where L is an integer greater than or equal to 1, and a corresponding minimum change period N = L × M, a value of another parameter may be obtained through values of any two parameters of N, L and M, where the values of any two parameters may be obtained through a protocol agreement or a higher layer signaling configuration.

Specifically, the network side device may agree in advance with each D2D terminal about values of at least two parameters of a minimum change period, a minimum indication period, and L; or,

the network side equipment informs the minimum change period, the minimum indication period and the value of at least two parameters in L to each D2D terminal in advance; or,

the network side device and each D2D terminal agree in advance on the value of one parameter of the minimum change period, the minimum indication period, and L, and notify each D2D terminal of the value of the remaining at least one parameter.

For example:

one minimum indication period is 10ms (10 subframes) of the length of one radio frame, where subframe 4 and subframe 8 are D2D subframes, then correspondingly if L is 2, then the minimum modification period is 20ms (20 subframes), the number of D2D subframes in the corresponding minimum indication period is 2, and the number of D2D subframes in the minimum modification period is 2 × 2= 4.

When the network side device notifies the corresponding D2D terminal of the resource location of the transmission resource, the notification may also carry a positive integer K indicating the notification valid time, the D2D terminal performs data transmission according to the notification in K minimum indication periods, and after the K minimum indication periods are ended, the notification is invalid, that is, data transmission is no longer performed according to the notification. When the notification of the resource location of the transmission resource sent by the network side device does not carry K, the D2D terminal will always transmit data according to the notification until receiving a new notification, and then start transmitting data according to the new notification from the next minimum change period.

The following may also be used: when the network side device notifies the corresponding D2D terminal of the resource location of the transmission resource, the notification may also carry a positive integer K indicating the validity time of the notification, the D2D terminal performs data transmission according to the notification in K × L minimum indication periods, and the notification is invalid after the K × L minimum indication periods are ended, that is, the data transmission is no longer performed according to the notification. When the notification of the resource location of the transmission resource sent by the network side device does not carry K, the D2D terminal will always transmit data according to the notification until receiving a new notification, and then start transmitting data according to the new notification from the next minimum change period. When L is equal to 1, this is the above approach.

Specifically, the network side device determines, according to the received resource occupation request, a resource location of a transmission resource of each D2D terminal in the D2D communication group in a minimum indication period, which may be specifically implemented as follows:

for each D2D terminal in the D2D communication group, selecting a pattern from a plurality of preset patterns of transmission resources (including transmission resources and/or reception resources) corresponding to the D2D terminal according to the received resource occupation request, and determining the resource position of the transmission resources of the D2D terminal according to the pattern, wherein each pattern of the transmission resources is a pattern indicating that each D2D subframe in a minimum indication period is used as the transmission resource or the reception resource.

For example, taking the example that the minimum indication period includes 4D 2D subframes, for a pair of D2D terminals, the pattern of transmission resources in one minimum indication period may be as shown in table 1 below:

TABLE 1

In table 1, "1" indicates that the corresponding subframe is a transmission subframe, and "0" indicates that the corresponding subframe is a reception subframe.

Further, when determining the resource location of the transmission resource of each D2D terminal, the network side device may first determine the location of the fixed resource used for the D2D terminal to perform data transmission and/or reception according to a preset rule, and then determine the location of the non-fixed resource used for the D2D terminal to perform data transmission or reception according to the received resource occupation request.

The D2D subframes fixed for the D2D terminals to transmit or receive data may be determined according to the preset rule, specifically, the D2D subframes may be determined according to the identification information of the D2D terminals, for example, taking a pair of D2D terminals as an example, the positions of the transmission resources of the UE1 may be determined according to the identification information of the UE1, for example, according to the formula: mod (UE _ ID _1, M1), determining the location of the transmission resources of UE 1; determining a location of a reception resource of the UE1 from the identification information of the UE2, such as according to the formula: mod (UE _ ID _2, M1) determines the location of the reception resources of UE 1; where M1 is the number of D2D subframes in the minimum indication period.

The network side can also determine the D2D subframes fixedly used for the D2D terminals to transmit or receive data according to the number of the D2D terminals and the number of the D2D subframes included in one minimum indication period. For example, some D2D subframes in the predefined pattern fix the location of either the receive resource or the transmit resource.

Also illustrated in table 1 above: for a pair of D2D terminals, if the minimum indication period of the D2D link includes 4D 2D subframes, wherein the D2D UE1 may fix to transmit data in D2D subframe 1, fix to receive data in D2D subframe 3, wherein the D2D UE2 may fix to receive data in D2D subframe 1, fix to transmit data in D2D subframe 3, and for D2D subframes 2 and 4, it may be determined according to a request of resource occupation transmitted by two D2D terminals that it is a transmission resource/reception resource configured as D2D UE1, or a transmission resource/reception resource configured as D2D UE 2.

Further, when the network side device notifies the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal in the D2D communication group, the network side device may also notify the corresponding D2D terminal of information of the transmission scheme adopted when each D2D terminal in the D2D communication group performs data transmission. The transmission scheme may include a modulation coding scheme, etc.

In step 51, the network side device notifies the resource location of the transmission resource of each D2D terminal in the D2D communication group to the corresponding D2D terminal, which may specifically be implemented in the following two ways:

firstly, indicating individually, that is, the network side device sends an indication signaling to each D2D terminal in the D2D communication group, where each indication signaling carries information of a resource location of a transmission resource of a corresponding D2D terminal; this approach may be applied to a pair of D2D terminals that perform D2D communications, or to a case where the number of D2D terminals is relatively small;

secondly, joint indication, that is, the network side device sends an indication signaling to each D2D terminal in the D2D communication group, where the indication signaling carries information of the resource location of the transmission resource of each D2D terminal. This scheme can be applied to a pair of D2D terminals that perform D2D communication, or to a case where the number of D2D terminals is relatively large.

When the joint indication mode is adopted, the following two methods can be specifically adopted:

firstly, information of resource positions of transmission resources of the D2D terminals are concatenated in the indication signaling, and the corresponding relation between the D2D terminals and the information of the resource positions of the transmission resources is obtained through other preset configuration information;

second, the indication signaling includes identification information of each D2D terminal and information of the resource location of the corresponding transmission resource.

The information of the resource location of the transmission resource of a certain D2D terminal may be represented in the following two ways:

first, a bitmap (bitmap) mode is used to indicate whether each D2D subframe is a transmission resource or a reception resource in a minimum indication period, for example, "1" indicates a transmission resource, and "0" indicates a reception resource.

Second, index (index) information of a pattern indicating transmission resources in a selected one of the minimum indication periods indicates whether each D2D subframe in the pattern is a transmission resource or a reception resource. The method needs to notify the D2D terminal of the index information of the pattern of each transmission resource and the information that each D2D subframe in the corresponding pattern is a transmission resource or a reception resource in advance.

The indication signaling sent by the network side device may specifically be:

control signaling for layer 1 (L1): DCI carried through a PDCCH; in order not to increase the number of blind detections, the bit length of the transmitted DCI may be the same as the bit length of one of the existing DCI formats, for example: the bit length of DCI format0/1a, and idle bit padding 0; or

Control signaling for layer 2 (L2): a Medium Access Control (MAC) Control Element (CE) carried by the PDSCH; or

RRC signaling: higher layer signaling carried over the PDSCH.

Specifically, when each D2D terminal in the network side device D2D communication group sends an indication signaling carrying the location information of the transmission resource of the D2D terminal:

for each D2D terminal in a D2D communication group, the network side equipment sends a piece of Downlink Control Information (DCI) scrambled by using the special D2D-RNTI to the D2D terminal through a search space of a Physical Downlink Control Channel (PDCCH) or an enhanced physical downlink control channel (E-PDCCH) determined by the special D2D radio network temporary identifier (D2D-RNTI) of the D2D terminal, wherein the DCI carries the information of the resource position of the transmission resource of the D2D terminal; the search space is a user-specific search space or a public search space; or,

for each D2D terminal in a D2D communication group, the network side equipment transmits a piece of DCI scrambled by using the special D2D-RNTI to the D2D terminal through a user-specific search space of the PDCCH or the E-PDCCH determined by the special D2D-RNTI of the D2D terminal so as to schedule the D2D terminal to receive information of resource positions of transmission resources and reception resources through a Physical Downlink Shared Channel (PDSCH); and transmitting information of resource positions of transmission resources and reception resources of the D2D terminal to the D2D terminal through the PDSCH according to the scheduling result.

The network side equipment sends an indication signaling to each D2D terminal in the D2D communication group, and when the indication signaling carries the information of the resource position of the transmission resource of each D2D terminal:

the network side equipment transmits a piece of DCI scrambled by using the shared D2D-RNTI through a common search space of the PDCCH or the E-PDCCH or a search space of the PDCCH or the E-PDCCH determined by the D2D-RNTI shared by all D2D terminals in the D2D communication group, wherein the DCI carries information of transmission resource positions of all D2D terminals in the D2D communication group; the search space is a user-specific search space or a public search space; or,

for each D2D terminal in a D2D communication group, the network side equipment transmits a piece of DCI scrambled by using the shared D2D-RNTI to the D2D terminal through a common search space of the PDCCH or the E-PDCCH or a search space of the PDCCH or the E-PDCCH determined by the D2D-RNTI shared by all D2D terminals in the D2D communication group so as to schedule the D2D terminal to receive information of resource positions of transmission resources through the PDSCH; transmitting information of transmission resources of each D2D terminal through the PDSCH according to the scheduling result; the search space is a user-specific search space or a common search space.

Preferably, the network side device may further notify each D2D terminal in the D2D communication group of the D2D communication resource corresponding to the D2D communication group.

Referring to fig. 6, an embodiment of the present invention is directed to a data transmission method in D2D communication provided by a terminal side, including the following steps:

step 60: the D2D terminal receives the notification of the resource position of the transmission resource of the D2D terminal sent by the network side equipment; the D2D terminal is a D2D terminal in the D2D communication group, and the notification is a notification of the resource location of the transmission resource of the D2D terminal, which is determined in the D2D communication resource corresponding to the D2D communication group according to the received resource occupation request after the network side device receives the resource occupation request sent by at least one D2D terminal in the D2D communication group; the transmission resources comprise transmission resources and/or reception resources; the D2D communication resource corresponding to the D2D communication group refers to the D2D communication resource shared by all D2D terminals in the D2D communication group; the D2D terminal may determine the D2D communication resource corresponding to the D2D communication group according to the configuration information issued by the network side device; the D2D communication group may contain two or more numbers of D2D terminals;

step 61: the D2D terminal performs data transmission on the transmission resource of the D2D terminal according to the received notification, specifically, when the received notification includes the resource location information of the transmission resource, transmits data to the other D2D terminal on the transmission resource, and when the received notification includes the resource location information of the reception resource, receives data transmitted by the other D2D terminal on the reception resource.

Further, before step 60, the D2D terminal may send a resource occupation request to the network side device.

Specifically, the notification received by the D2D terminal in step 60 is a notification indicating the resource location of the transmission resource in the minimum indication period, which is received by the D2D terminal in the current minimum change period last; correspondingly, in step 61, the D2D terminal performs data transmission on the transmission resource of the D2D terminal according to the notification, which is specifically implemented as: the D2D terminal transmits data on the transmission resource indicated by the notification for at least one subsequent minimum change period; wherein each minimum modification period comprises L minimum indication periods, and L is an integer not less than 1. Here, when the D2D terminal receives a notification indicating a resource location of a transmission resource in a minimum indication period within a current minimum change period, the D2D terminal performs data transmission in at least one subsequent minimum change period according to the transmission resource indicated by the notification; when the D2D terminal receives a plurality of notifications indicating the resource locations of the transmission resources in the minimum indication period in the current minimum change period, the D2D terminal performs data transmission according to the transmission resources indicated by the last notification in at least one subsequent minimum change period.

Specifically, each minimum indication period includes M subframes, where the M subframes include M1D 2D subframes, where M is an integer greater than 1 and M1 is an integer not less than 1. Preferably, M is an integer multiple of the number of subframes included in a radio frame of the LTE system (equivalent to an integer multiple of 10 subframes).

Specifically, the D2D terminal may agree in advance with the network side device about values of at least two parameters of a minimum change period, a minimum indication period, and L; or,

the D2D terminal receives values of at least two parameters of a minimum change period, a minimum indication period and L which are sent by network side equipment in advance; or,

the D2D terminal and the network side device agree in advance on the value of one parameter of the minimum change period, the minimum indication period and the L, and receive the value of the remaining at least one parameter sent by the network side device in advance.

The notification of the resource location of the transmission resource received by the D2D terminal may also carry a positive integer K indicating the validity time of the notification, and the D2D terminal performs data transmission in K minimum indication periods according to the notification, and the notification becomes effective after the K minimum indication periods are ended, that is, no data transmission is performed according to the notification. When the notification does not carry K, the D2D terminal will transmit data according to the notification until receiving a new notification, and then start to transmit data according to the new notification from the next minimum change period.

The following may also be used: the notification of the resource position of the transmission resource received by the D2D terminal may also carry a positive integer K indicating the validity time of the notification, and the D2D terminal performs data transmission according to the notification in K × L minimum indication periods, and takes effect after the K × L minimum indication periods end, that is, does not perform data transmission according to the notification any more. When the notification does not carry K, the D2D terminal will transmit data according to the notification until receiving a new notification, and then start to transmit data according to the new notification from the next minimum change period. When L is equal to 1, this is the above approach.

Preferably, the notification received by the D2D terminal in step 60 further includes information of a transmission scheme adopted by the D2D terminal for data transmission; accordingly, in step 61, the D2D terminal adopts the notified transmission scheme to perform data transmission on the transmission resource of the D2D terminal. The transmission scheme may include a modulation coding scheme, etc.

Further, after the D2D terminal receives the notification, the D2D terminal receives again the notification of the resource location of the transmission resource of the D2D terminal sent by the network side device; the D2D terminal starts data transmission on the newly notified transmission resource from the subsequent minimum change period.

In step 60, the D2D terminal receives the notification of the resource location of the transmission resource of the D2D terminal sent by the network side device, and the following two specific implementations may be adopted:

firstly, a D2D terminal receives an indication signaling sent by a network side device for the D2D terminal, where the indication signaling carries information of a resource location of a transmission resource of the D2D terminal;

secondly, the D2D terminal receives an indication signaling sent by the network side device for each D2D terminal in the D2D communication group, where the indication signaling carries information of the resource location of the transmission resource of each D2D terminal.

The indication signaling sent by the network side device may specifically be:

RRC signaling: higher layer signaling carried over the PDSCH.

Specifically, when the D2D terminal receives an indication signaling sent by the network side device for the D2D terminal, the following is specifically performed:

the D2D terminal receives DCI scrambled by the dedicated D2D-RNTI in a search space of a PDCCH or an enhanced E-PDCCH determined by the dedicated D2D-RNTI of the D2D terminal, wherein the DCI carries the position information of the transmission resources of the D2D terminal; the search space is a user-specific search space or a public search space; or,

the D2D terminal receives DCI scrambled by the special D2D-RNTI in a user-specific search space of a PDCCH or an E-PDCCH determined by the special D2D-RNTI of the D2D terminal, and acquires a scheduling signaling for scheduling the D2D terminal to receive resource location information through the PDSCH from the DCI by a network side; receiving information of resource locations of transmission resources of the D2D terminal on the PDSCH according to the scheduling signaling.

When the D2D terminal receives the indication signaling sent by the network side device for each D2D terminal in the D2D communication group, the following details are as follows:

the method comprises the steps that a D2D terminal receives DCI scrambled by using a shared D2D-RNTI sent by a network side device in a common search space of a PDCCH or an E-PDCCH or in a search space of the PDCCH or the E-PDCCH determined by the D2D-RNTI shared by all D2D terminals in a D2D communication group, wherein the DCI carries information of resource positions of transmission resources of all D2D terminals in a D2D communication group; the search space is a user-specific search space or a public search space; or,

the D2D terminal receives DCI scrambled by the shared D2D-RNTI sent by a network side device in a common search space of the PDCCH or E-PDCCH or a search space of the PDCCH or E-PDCCH determined by the D2D-RNTI shared by all D2D terminals in a D2D communication group, and acquires a scheduling signaling for scheduling the D2D terminal to receive resource location information through the PDSCH from the DCI by the network side; receiving resource location information of transmission resources of each D2D terminal on the PDSCH according to the scheduling signaling; the search space is a user-specific search space or a common search space.

The network side device in the invention can be a base station, a Relay Node (RN) and other devices. As shown in fig. 7, the interaction flow between the base station and the D2D terminal is as follows:

step 1: at least one D2D terminal (e.g., D2D terminal A and D2D terminal B) within the D2D communication group sends a resource occupancy request to the base station;

step 2: after receiving the resource occupancy request sent by the D2D terminal, the base station determines the D2D communication resources (e.g., three D2D subframes in fig. 7) corresponding to the D2D communication group, and determines the resource location of the transmission resource of each D2D terminal in the D2D communication group according to the received resource occupancy request, for example, in fig. 7, the base station determines the first two D2D subframes included in the D2D communication resources as the transmission resources of the D2D terminal a, the next D2D subframe is determined as the reception resources of the D2D terminal a, and at the same time, the first two D2D subframes included in the D2D communication resources are determined as the reception resources of the D2D terminal B, and the next D2D subframe is determined as the transmission resources of the D2D terminal B;

the base station notifies resource positions of transmission resources of D2D terminals in the D2D communication group to corresponding D2D terminals, for example, in fig. 7, the base station sends indication information that first two D2D subframes included in the D2D communication resources are transmission resources and next D2D subframe is reception resources to the D2D terminal a through an indication signaling of resource configuration, and sends indication information that first two D2D subframes included in the D2D communication resources are reception resources and next D2D subframe is transmission resources to the D2D terminal B;

and step 3: after receiving the indication signaling of the resource configuration, the D2D terminal a transmits data to the D2D terminal B in the first two D2D subframes of the D2D communication resource and receives data transmitted by the D2D terminal B in the last D2D subframe in M minimum change periods;

after receiving the indication signaling of the resource configuration, the D2D terminal B receives the data transmitted by the D2D terminal a in the first two D2D subframes of the D2D communication resource and transmits the data to the D2D terminal a in the last D2D subframe in M minimum change periods;

and 4, step 4: at least one D2D terminal (e.g., D2D terminal a and D2D terminal B) within the D2D communication group again transmits a resource occupation request to the base station;

and 5: after receiving the resource occupation request sent again by the D2D terminal, the base station re-determines the D2D communication resources (e.g., three D2D subframes in fig. 7) corresponding to the D2D communication group, and re-determines the resource positions of the transmission resources of each D2D terminal in the D2D communication group according to the received resource occupation request, for example, in fig. 7, the base station determines the previous D2D subframe included in the D2D communication resource as the transmission resource of the D2D terminal a, determines the next two D2D subframes as the reception resource of the D2D terminal a, and determines the previous D2D subframe included in the D2D communication resource as the reception resource of the D2D terminal B, and determines the next two D2D subframes as the transmission resource of the D2D terminal B;

the base station notifies the re-determined resource positions of the transmission resources of the D2D terminals in the D2D communication group to the corresponding D2D terminals, for example, in fig. 7, the base station sends, through an indication signaling of resource configuration, indication information that a previous D2D subframe included in the D2D communication resources is a transmission resource and two subsequent D2D subframes are reception resources to the D2D terminal a, and indication information that a previous D2D subframe included in the D2D communication resources is a reception resource and two subsequent D2D subframes are transmission resources to the D2D terminal B;

step 6: after the D2D terminal a receives the instruction signaling of resource allocation again, it transmits data to the D2D terminal B in the first D2D subframe of the D2D communication resource and receives data transmitted by the D2D terminal B in the second two D2D subframes within N minimum change periods starting from the M +1 th minimum change period;

after the D2D terminal B receives the instruction signaling of resource allocation again, it receives the data transmitted by the D2D terminal a in the first D2D subframe of the D2D communication resource and transmits the data to the D2D terminal a in the second two D2D subframes in the N minimum change periods starting from the M +1 th minimum change period.

Referring to fig. 8, an embodiment of the present invention provides a base station, where the base station includes:

a resource determining unit 81, configured to determine, after receiving a resource occupation request sent by at least one D2D terminal in the same D2D communication group each time, a D2D communication resource corresponding to the D2D communication group;

a location determining unit 82, configured to determine, according to the received resource occupation request, a resource location of a transmission resource of each D2D terminal within the D2D communication group, wherein the transmission resource of each D2D terminal is located in the D2D communication resource; the transmission resources comprise transmission resources and/or reception resources;

a location notification unit 83, configured to notify the resource location of the transmission resource of each D2D terminal in the D2D communication group to the corresponding D2D terminal, so as to instruct the corresponding D2D terminal to perform data transmission on the notified transmission resource.

Further, the resource determining unit 81 is configured to:

determining the communication resource pre-allocated to the D2D communication group as the D2D communication resource corresponding to the D2D communication group; or,

allocating D2D communication resources corresponding to the D2D communication group according to the received resource occupation request.

Further, the resource occupation request sent by each D2D terminal received by the resource determination unit 81 includes:

the D2D terminal sends SR on dedicated SR resource configured for itself by the network side for the D2D link, where the SR is used to indicate that the D2D terminal needs to transmit data on the D2D link; and/or the presence of a gas in the gas,

and the buffer status report BSR for the D2D communication, which is sent by the D2D terminal on a Physical Uplink Shared Channel (PUSCH) resource scheduled by the network side, is used for indicating the data volume which needs to be transmitted by the D2D terminal currently on the D2D link.

Further, the position determination unit 82 is configured to:

determining a resource position of a transmission resource of each D2D terminal in the D2D communication group in a minimum indication period according to the received resource occupation request;

the position notification unit 83 is configured to:

notifying the resource position of the transmission resource of each D2D terminal in the minimum indication period in the D2D communication group to the corresponding D2D terminal so as to indicate the corresponding D2D terminal to perform data transmission on the transmission resource indicated by the notification in at least one subsequent minimum change period; wherein each minimum modification period comprises L minimum indication periods, and L is an integer not less than 1.

Further, each minimum indication period includes M subframes, where the M subframes include M1D 2D subframes, where M is an integer greater than 1 and M1 is an integer not less than 1.

Further, M is an integer multiple of the number of subframes included in a radio frame of the LTE system.

Further, the base station further includes:

a parameter determining unit 84, configured to agree in advance with each D2D terminal about values of at least two parameters of a minimum change period, a minimum indication period, and L; or,

notifying the values of at least two parameters in a minimum change period, a minimum indication period and L to each D2D terminal in advance; or,

and appointing the value of one parameter of the minimum change period, the minimum indication period and the L with each D2D terminal in advance, and informing the value of the remaining at least one parameter to each D2D terminal in advance.

Further, the position determination unit 82 is configured to:

for each D2D terminal in the D2D communication group, selecting a pattern from a plurality of preset patterns of transmission resources corresponding to the D2D terminal according to the received resource occupation request, and determining the resource position of the transmission resource of the D2D terminal according to the pattern, wherein each pattern of the transmission resource is a pattern of a D2D subframe in a minimum indication period as a transmission resource or a receiving resource.

Further, the position determination unit 82 is configured to:

when determining the resource position of the transmission resource of each D2D terminal, determining the position of the fixed resource used for the D2D terminal to transmit or receive data according to a preset rule, and determining the position of the non-fixed resource used for the D2D terminal to transmit or receive data according to the received resource occupation request.

Further, the position notification unit 83 is further configured to:

when the resource location of the transmission resource of each D2D terminal in the D2D communication group is notified to the corresponding D2D terminal, the information of the transmission scheme adopted when each D2D terminal in the D2D communication group performs data transmission is notified to the corresponding D2D terminal.

Further, the position notification unit 83 is configured to:

respectively sending an indication signaling to each D2D terminal in the D2D communication group, wherein each indication signaling carries information of the resource position of the transmission resource of the corresponding D2D terminal; or,

and sending an indication signaling to each D2D terminal in the D2D communication group, wherein the indication signaling carries the information of the resource position of the transmission resource of each D2D terminal.

Referring to fig. 9, an embodiment of the present invention provides a D2D terminal, where the D2D terminal includes:

a location notification receiving unit 90, configured to receive a notification of a resource location of a transmission resource of the D2D terminal sent by the network side device; the D2D terminal is a D2D terminal in the D2D communication group, and the notification is a notification of the resource location of the transmission resource of the D2D terminal, which is determined in the D2D communication resource corresponding to the D2D communication group according to the received resource occupation request after the network side device receives the resource occupation request sent by at least one D2D terminal in the D2D communication group; the transmission resources comprise transmission resources and/or reception resources;

a data transmission unit 91, configured to perform data transmission on the transmission resource of the D2D terminal according to the notification.

Further, the D2D terminal further includes:

a request sending unit 92, configured to send a resource occupation request to the network side device before receiving the notification.

Further, the resource occupation request sent by the request sending unit 92 includes:

the terminal D2D sends an SR on a dedicated scheduling request SR resource configured for the terminal D2D on the network side, wherein the SR is used for indicating that the terminal D2D needs to transmit data on the link D2D; and/or the presence of a gas in the gas,

and the buffer status report BSR for the D2D communication, sent by the D2D terminal on the PUSCH resource scheduled by the network side, is used for indicating the data amount which needs to be transmitted by the D2D terminal currently on the D2D link.

Further, the position notification receiving unit 90 receives the notification indicating the resource position of the transmission resource in the last indicated minimum indication period received by the D2D terminal in the current minimum modification period;

the data transmission unit 91 is configured to:

for at least one subsequent minimum change period, performing data transmission on the transmission resource indicated by the notification; wherein each minimum modification period comprises L minimum indication periods, and L is an integer not less than 1.

Further, the D2D terminal further includes:

a parameter determining unit 93, configured to agree in advance with a network side device about values of at least two parameters of a minimum change period, a minimum indication period, and L; or,

receiving values of at least two parameters in a minimum change period, a minimum indication period and L which are sent by network side equipment in advance; or,

and presetting a value of one parameter of the minimum change period, the minimum indication period and the L with the network side equipment, and receiving a value of the remaining at least one parameter sent by the network side equipment in advance.

Further, the notification received by the location notification receiving unit 90 further includes information of a transmission scheme adopted by the D2D terminal when performing data transmission;

the data transmission unit 91 is configured to:

and transmitting data on the transmission resource of the D2D terminal by adopting the notified transmission scheme.

Further, the location notification receiving unit 90 is further configured to: receiving again a notification of the resource location of the transmission resource of the D2D terminal sent by the network side device;

the data transmission unit 91 is further configured to: and starting to transmit data on the newly notified transmission resource from the subsequent minimum change period.

Further, the location notification receiving unit 90 is configured to:

receiving an indication signaling sent by a network side device for the D2D terminal, where the indication signaling carries information of a resource location of a transmission resource of the D2D terminal; or,

and receiving an indication signaling sent by the network side equipment for each D2D terminal in the D2D communication group, wherein the indication signaling carries information of the resource position of the transmission resource of each D2D terminal.

In conclusion, the beneficial effects of the invention include:

in the scheme provided by the embodiment of the invention, after receiving a resource occupation request sent by at least one D2D terminal in the same D2D communication group each time, a network side device determines a D2D communication resource corresponding to the D2D communication group, determines a resource position of a transmission resource of each D2D terminal in the D2D communication group in the D2D communication resource according to the received resource occupation request, notifies the corresponding D2D terminal of the resource position of the transmission resource of each D2D terminal, and after receiving the notification of the resource position of the transmission resource of the D2D terminal sent by the network side device, the D2D terminal performs data transmission on the transmission resource of the D2D terminal according to the notification, wherein the data transmission and/or data reception includes data transmission and/or data reception. Therefore, the scheme solves the problem of how to utilize D2D communication resources to transmit and receive data by each D2D terminal in the same D2D communication group; in addition, in the scheme, the network side device allocates transmission resources, including transmission resources and/or reception resources, in the D2D communication resources for each D2D terminal in the D2D communication group according to the received resource occupation request, that is, the service requirement of the D2D terminal, so that the resource utilization rate of the system is improved, and the network side device allocates the transmission resources for each D2D terminal in a unified manner, so that the problem of resource contention of a plurality of D2D terminals in each D2D subframe can be avoided.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A method of data transmission in a device-to-device, D2D, communication, the method comprising:

2. The method according to claim 1, wherein the determining, by the network side device, the D2D communication resource corresponding to the D2D communication group specifically includes:

the network side equipment determines the communication resource pre-allocated to the D2D communication group as the D2D communication resource corresponding to the D2D communication group; or,

and the network side equipment allocates the D2D communication resources corresponding to the D2D communication group according to the received resource occupation request.

3. The method of claim 1, wherein the resource occupation request sent by the D2D terminal comprises:

4. The method of claim 1, wherein the determining the resource location of the transmission resource of each D2D terminal in the D2D communication group according to the received resource occupation request specifically comprises:

the method, by the network side device, of notifying the resource location of the transmission resource of each D2D terminal in the D2D communication group to the corresponding D2D terminal to instruct the corresponding D2D terminal to perform data transmission on the notified transmission resource includes:

the network side equipment notifies the corresponding D2D terminal of the resource position of the transmission resource of each D2D terminal in the minimum indication period in the D2D communication group so as to indicate the corresponding D2D terminal to perform data transmission on the transmission resource indicated by the notification in at least one subsequent minimum change period; wherein each minimum modification period comprises L minimum indication periods, and L is an integer not less than 1.

5. The method of claim 4, wherein each minimum indication period comprises M subframes, and the M subframes comprise M1D 2D subframes, wherein M is an integer greater than 1, and M1 is an integer not less than 1.

6. The method of claim 4, further comprising:

the network side equipment and each D2D terminal agree in advance on values of at least two parameters of a minimum change period, a minimum indication period and L; or,

7. The method as claimed in claim 4, wherein said determining resource locations of transmission resources of the D2D terminals in the D2D communication group in a minimum indication period according to the received resource occupation request specifically comprises:

8. The method of claim 1, wherein when determining the resource location of the transmission resource of each D2D terminal, the network side device determines the location of the fixed resource used for the D2D terminal to transmit or receive data according to a preset rule, and determines the location of the non-fixed resource used for the D2D terminal to transmit or receive data according to the received resource occupation request.

9. The method of claim 1, wherein when the network-side device notifies the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal in the D2D communication group, the method further comprises:

and the network side equipment notifies the corresponding D2D terminal of the information of the transmission scheme adopted when each D2D terminal in the D2D communication group carries out data transmission.

10. The method according to any one of claims 1 to 9, wherein the network side device notifies the resource location of the transmission resource of each D2D terminal in the D2D communication group to the corresponding D2D terminal, specifically comprising:

the network side equipment sends an indication signaling to each D2D terminal in the D2D communication group respectively, and each indication signaling carries information of the resource position of the transmission resource of the corresponding D2D terminal; or,

and the network side equipment sends an indication signaling to each D2D terminal in the D2D communication group, wherein the indication signaling carries the information of the resource position of the transmission resource of each D2D terminal.

11. A method of data transmission in a device-to-device, D2D, communication, the method comprising:

12. The method of claim 11, wherein prior to the D2D terminal receiving the notification, further comprising:

and the D2D terminal sends a resource occupation request to the network side equipment.

13. The method of claim 12, wherein the resource occupancy request comprises:

14. The method of claim 11, wherein the notification is a last notification indicating a resource location of the transmission resource in a minimum indication period received by the D2D terminal in a current minimum change period;

the D2D terminal performs data transmission on the transmission resource of the D2D terminal according to the notification, and specifically includes:

the D2D terminal transmits data on the transmission resource indicated by the notification for at least one subsequent minimum change period; wherein each minimum modification period comprises L minimum indication periods, and L is an integer not less than 1.

15. The method of claim 14, wherein each minimum indication period comprises M subframes, and the M subframes comprise M1D 2D subframes, wherein M is an integer greater than 1 and M1 is an integer not less than 1.

16. The method of claim 14, further comprising:

the D2D terminal and the network side equipment agree in advance on values of at least two parameters of a minimum change period, a minimum indication period and L; or,

17. The method according to claim 11, wherein the notification further includes information of a transmission scheme adopted by the D2D terminal for data transmission;

and the D2D terminal adopts the informed transmission scheme to carry out data transmission on the transmission resource of the D2D terminal.

18. The method of any of claims 14-16, wherein after the D2D terminal receives the notification, further comprising:

the D2D terminal receives again the notification of the resource location of the transmission resource of the D2D terminal sent by the network side device;

the D2D terminal starts data transmission on the newly notified transmission resource from the subsequent minimum change period.

19. The method as claimed in any of claims 11 to 17, wherein the receiving, by the D2D terminal, the notification of the resource location of the transmission resource of the D2D terminal sent by the network side device specifically includes:

a D2D terminal receives an indication signaling sent by a network side device for the D2D terminal, wherein the indication signaling carries information of resource positions of transmission resources of the D2D terminal; or,

and the D2D terminal receives an indication signaling sent by the network side equipment for each D2D terminal in the D2D communication group, wherein the indication signaling carries the information of the resource position of the transmission resource of each D2D terminal.

20. A base station, comprising:

21. The base station of claim 20, wherein the resource determining unit is configured to:

22. The base station of claim 20, wherein the resource occupation request sent by the D2D terminal and received by the resource determination unit comprises:

23. The base station of claim 20, wherein the position determination unit is to:

the location notification unit is configured to:

24. The base station of claim 23, wherein each minimum indication period comprises M subframes, and the M subframes comprise M1D 2D subframes, wherein M is an integer greater than 1 and M1 is an integer not less than 1.

25. The base station of claim 23, wherein the base station further comprises:

the parameter determining unit is used for agreeing values of at least two parameters of a minimum change period, a minimum indication period and L with each D2D terminal in advance; or,

26. The base station of claim 23, wherein the position determination unit is to:

27. The base station of claim 20, wherein the position determination unit is to:

28. The base station of claim 20, wherein the location notification unit is further configured to:

29. The base station of any of claims 20-28, wherein the location notification unit is configured to:

30. A D2D terminal, the D2D terminal comprising:

31. The D2D terminal of claim 30, wherein the D2D terminal further comprises:

a request sending unit, configured to send a resource occupation request to the network side device before receiving the notification.

32. The D2D terminal of claim 31, wherein the resource occupation request sent by the request sending unit includes:

33. The D2D terminal of claim 30, wherein the notification received by the location notification receiving unit is a notification indicating a resource location of transmission resources in a minimum indication period last received by the D2D terminal at a current minimum modification period;

the data transmission unit is used for:

34. The D2D terminal of claim 33, wherein each minimum indication period includes M subframes, the M subframes include M1D 2D subframes, wherein M is an integer greater than 1 and M1 is an integer no less than 1.

35. The D2D terminal of claim 33, wherein the D2D terminal further comprises:

the parameter determining unit is used for agreeing values of at least two parameters of a minimum change period, a minimum indication period and L with the network side equipment in advance; or,

36. The D2D terminal of claim 30, wherein the notification received by the location notification receiving unit further includes information of a transmission scheme adopted by the D2D terminal for data transmission;

the data transmission unit is used for:

37. The D2D terminal of any of claims 33-35, wherein the location notification receiving unit is further configured to: receiving again a notification of the resource location of the transmission resource of the D2D terminal sent by the network side device;

the data transmission unit is further configured to: and starting to transmit data on the newly notified transmission resource from the subsequent minimum change period.

38. The D2D terminal of any of claims 30-36, wherein the location notification receiving unit is to: