TWI516161B - Data transmission methods and equipment in D2D communication - Google Patents

Description

Data transmission method and device in D2D communication

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

Device-to-Device (D2D) (also known as terminal direct-through) communication system under cellular network control. For the convenience of description, the communication link between D2D terminals is defined as D2D link (Device -to-device link), the cellular communication link between the network and the D2D terminal is called a N2D link (Network-to-device link), as shown in Figure 1.

For the D2D data transmission process, the uplink carrier (Frequency Division Duplex (FDD) system)/uplink subframe (Time Division Duplex (TDD) system) or the downlink carrier (FDD system) is adopted. The consideration of the downlink sub-frame (TDD system) is as follows: For the downlink subframe/downlink carrier, the following situation occurs: the user equipment (UE) receives the data transmitted on the N2D link on the base station side. (At least the data of the physical downlink control channel (PDCCH) is included), and the data is transmitted on the D2D link, so that the UE needs to perform transceiving after receiving the PDCCH, and demodulate the PDCCH. It is said that it is necessary to receive multi-column cell-specific reference signals (CRS) for demodulation, thereby obtaining better For PDCCH demodulation performance, the Orthogonal Frequency Division Multiplexing (OFDM) symbols that can be used for D2D link transmission in the downlink subframe/downlink carrier are relatively small in consideration of the time of transmission and reception conversion. Therefore, the uplink subframe/uplink carrier is preferred as a resource for D2D data transmission.

Generally, for a group of D2D terminals, the network side semi-statically configures a common time-frequency resource for D2D communication (D2D link) for the group of D2D terminals, which may be a subframe (time domain) + a physical resource block. (PRB) (frequency domain) configuration.

In the traditional cellular communication technology, the data communication process between the two terminals is as shown in FIG. 2 . Services such as voice and data of the two terminals interact through the base station (eNB) and the core network where they reside.

D2D is a method in which neighboring terminals can transmit data through a direct link in a short range, and does not need to be forwarded through a central node (ie, a base station), as shown in FIG. The short-distance communication characteristics and direct communication mode of D2D technology have the following advantages: the terminal short-distance direct communication method can achieve higher data rate, lower delay and lower power consumption; and utilizes widely distributed in the network. The short-distance characteristics of the user terminal and the D2D communication link can realize the effective use of spectrum resources; the direct communication mode of D2D can adapt to the local data sharing requirements of services such as wireless P2P, and provide flexible data-adaptive data services; D2D direct Communication can take advantage of the large number of widely distributed communication terminals in the network to extend the coverage of the network.

In summary, each D2D terminal belonging to the same D2D communication group uses D2D communication resources for data transmission and reception. Currently, there is no specific implementation scheme.

The embodiments of the present invention provide a data transmission method and device for D2D communication, which are used to solve the problem of how each D2D terminal in the same D2D communication group uses D2D communication resources to transmit and receive data.

A data transmission method in D2D communication, the method includes: after receiving a resource occupation request sent by at least one D2D terminal in the same D2D communication group, the network side device determines a D2D communication resource corresponding to the D2D communication group, according to the received a resource occupancy request, determining a resource location of a transmission resource of each D2D terminal in the D2D communication group, where a transmission resource of each D2D terminal is located in the D2D communication resource; the transmission resource includes a transmission resource and/or a reception resource; The device notifies the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal in the D2D communication group, to instruct the corresponding D2D terminal to perform data transmission on the notified transmission resource.

Preferably, the network side device determines the D2D communication resource corresponding to the D2D communication group, and specifically includes: the network side device pre-allocates the communication resource allocated to the D2D communication group, and determines the D2D communication resource corresponding to the D2D communication group; or The network side device allocates the D2D communication resource corresponding to the D2D communication group according to the received resource occupation request.

Preferably, the resource occupation request sent by the D2D terminal includes: an SR sent by the D2D terminal on the dedicated scheduling request SR resource for the D2D link configured by the D2D terminal, the SR is used to indicate that the D2D terminal needs to be in the Transmitting data on the D2D link; and/or physical uplink shared channel PUSCH allocated by the D2D terminal on the network side The buffer status report BSR for D2D communication sent on the source is used to indicate the amount of data that the D2D terminal needs to transmit on the D2D link.

Preferably, the determining, according to the received resource occupation request, the resource location of the transmission resource of each D2D terminal in the D2D communication group, specifically: determining, according to the received resource occupation request, each D2D in the D2D communication group. The resource location of the transmission resource of the terminal in the minimum indication period; the network side device notifying the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal in the D2D communication group, to indicate the transmission of the notification by the corresponding D2D terminal The data transmission on the resource includes: the network side device notifying the corresponding D2D terminal of the resource location of the transmission resource in the minimum indication period of each D2D terminal in the D2D communication group, to indicate that the corresponding D2D terminal is at least subsequent Data transmission is performed on the transmission resource indicated by the notification in a minimum change period; wherein each minimum change period includes L minimum indication periods, and L is an integer not less than one.

Preferably, each of the minimum indication periods includes M subframes, and the M subframes include M1 D2D subframes, where M is an integer greater than 1, and M1 is an integer not less than 1.

Preferably, the network side device and the D2D terminals pre-arrange the minimum change period, the minimum indication period, and the value of at least two parameters in the L; or the network side device presets the minimum change period, the minimum indication period, and the L The value of at least two parameters is notified to each D2D terminal; or the network side device and each D2D terminal pre-arrange the minimum change period, the minimum indication period, the value of one parameter in L, and pre-position the remaining at least one parameter. Value notification Each D2D terminal.

Preferably, the determining, according to the received resource occupation request, the resource location of the transmission resource of each D2D terminal in the D2D communication group in a minimum indication period, specifically: for each D2D terminal in the D2D communication group, Selecting a pattern from a preset pattern of the plurality of transmission resources corresponding to the D2D terminal according to the received resource occupation request, and determining a resource location of the transmission resource of the D2D terminal according to the pattern, where the pattern of each transmission resource is one The D2D subframe in the minimum indication period is used as a pattern for transmitting resources or receiving resources.

Preferably, 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 data transmission or reception by the D2D terminal according to a preset rule, and according to the received resource occupation request. Determining the location of the non-stationary resource used for data transmission or reception by the D2D terminal.

Preferably, 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 further performs data on each D2D terminal in the D2D communication group. The information of the transmission scheme used in the transmission is notified to the corresponding D2D terminal.

Based on any of the foregoing method embodiments, preferably, 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 specifically includes: the network side device is in the D2D communication group. Each D2D terminal sends an indication signaling, where each indication signaling carries information about a resource location of a transmission resource corresponding to the D2D terminal; or the network side device sends an indication to each D2D terminal in the D2D communication group. Signaling, the indication signaling carries information about resource locations of transmission resources of each D2D terminal.

A data transmission method in D2D communication, the method comprising: receiving, by a D2D terminal, a notification of a resource location of a transmission resource of the D2D terminal sent by a network side device; the D2D terminal being a D2D terminal in a D2D communication group, the notification is a network After receiving the resource occupation request sent by the at least one D2D terminal in the D2D communication group, the roadside device determines, according to the received resource occupation request, the resource of the transmission resource of the D2D terminal determined in the D2D communication resource corresponding to the D2D communication group. The notification of the location; the transmission resource includes a transmission resource and/or a reception resource; and the D2D terminal performs data transmission on the transmission resource of the D2D terminal according to the notification.

Preferably, before the D2D terminal receives the notification, the method further includes: the D2D terminal sending a resource occupation request to the network side device.

Preferably, the resource occupation request includes: an SR sent by the D2D terminal on the dedicated scheduling request SR resource for the D2D link configured by the D2D terminal, where the SR is used to indicate that the D2D terminal needs to transmit data on the D2D link. And/or, the buffer status report BSR for the D2D communication sent by the D2D terminal on the physical uplink shared channel PUSCH resource scheduled by the network side, the BSR is used to indicate the amount of data that the D2D terminal needs to transmit on the D2D link.

Preferably, the notification is a notification of a resource location of the transmission resource in the last indication minimum indication period received by the D2D terminal in the current minimum change period; the D2D terminal performs data on the transmission resource of the D2D terminal according to the notification. The transmission specifically includes: at least one minimum change period for the D2D terminal, in the notification Data transmission is performed on the indicated transmission resources; wherein each minimum change period includes L minimum indication periods, and L is an integer not less than one.

Preferably, each of the minimum indication periods includes M subframes, and the M subframes include M1 D2D subframes, where M is an integer greater than 1, and M1 is an integer not less than 1.

Preferably, the method further includes: the D2D terminal and the network side device pre-arranging the minimum change period, the minimum indication period, and the value of at least two parameters in the L; or the D2D terminal receiving the minimum change period and the minimum indication sent by the network side device in advance. The value of at least two parameters in the period and the L; or, the D2D terminal and the network side device pre-agreed the minimum change period, the minimum indication period, the value of one parameter in the L, and the remaining at least one parameter sent by the network side device in advance. The value.

Preferably, the notification further includes information about a transmission scheme used by the D2D terminal for data transmission; the D2D terminal performs data transmission on the transmission resource of the D2D terminal according to the notification, which specifically includes: the D2D terminal uses the notification transmission. The solution performs data transmission on the transmission resource of the D2D terminal.

Preferably, after receiving the notification by the D2D terminal, the method further includes: the D2D terminal receiving the notification of the resource location of the transmission resource of the D2D terminal sent by the network side device again; the D2D terminal from the subsequent The minimum change cycle begins with the transmission of the latest notification Data transmission on the source.

And the receiving, by the D2D terminal, the indication that the D2D terminal receives the resource location of the transmission resource of the D2D terminal, where the D2D terminal receives the indication sent by the network side device for the D2D terminal. Signaling, the indication signaling carries the information of the resource location of the transmission resource of the D2D terminal; or the D2D terminal receives the indication signaling sent by the network side device for each D2D terminal in the D2D communication group, where the indication signaling is Information carrying the resource location of the transmission resource of each D2D terminal.

a base station, the base station includes: a resource determining unit, configured to: after receiving a resource occupation request sent by at least one D2D terminal in the same D2D communication group, determine a D2D communication resource corresponding to the D2D communication group; and a location determining unit, And determining, according to the received resource occupation request, a resource location of a transmission resource of each D2D terminal in the D2D communication group, where a transmission resource of each D2D terminal is located in the D2D communication resource; the transmission resource includes a transmission resource and/or And a location notification unit, configured to notify the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal in the D2D communication group, to instruct the corresponding D2D terminal to perform data transmission on the notified transmission resource.

Preferably, the resource determining unit is configured to: determine a communication resource pre-assigned to the D2D communication group as a D2D communication resource corresponding to the D2D communication group; or allocate the D2D communication group according to the received resource occupation request. D2D communication resources.

Preferably, the resource occupation request sent by the D2D terminal received by the resource determining unit includes: an SR sent by the D2D terminal on the dedicated scheduling request SR resource for the D2D link configured by the D2D terminal, and the SR is used by the D2D terminal. Indicates that the D2D terminal needs to transmit data on the D2D link; and/or the buffer status report BSR for the D2D communication sent by the D2D terminal on the physical uplink shared channel PUSCH resource scheduled by the network side, the BSR is used to indicate the The amount of data that the D2D terminal currently needs to transmit on the D2D link.

Preferably, the location determining unit is configured to: determine, 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; the location notification unit is configured to: Each D2D terminal in the D2D communication group notifies the corresponding D2D terminal of the resource location of the transmission resource in the minimum indication period to indicate that the corresponding D2D terminal performs on the transmission resource indicated by the notification in the subsequent at least one minimum change period. Data transmission; wherein each minimum change period includes L minimum indication periods, and L is an integer not less than one.

Preferably, each of the minimum indication periods includes M subframes, and the M subframes include M1 D2D subframes, where M is an integer greater than 1, and M1 is an integer not less than 1.

Preferably, the base station further includes: a parameter determining unit, configured to pre-agreed with each D2D terminal a minimum change period, a minimum indication period, and a value of at least two parameters in the L; or, the minimum change period and the minimum indication are preset in advance The value of at least two parameters in the period and L is notified to each D2D terminal; or, The minimum change period, the minimum indication period, and the value of one parameter in L are pre-agreed with each D2D terminal, and the values of the remaining at least one parameter are previously notified to each D2D terminal.

Preferably, the location determining unit is configured to: select, for each D2D terminal in the D2D communication group, a pattern from a preset pattern of multiple transmission resources corresponding to the D2D terminal according to the received resource occupation request, and follow The pattern determines a resource location of the transmission resource of the D2D terminal, wherein the pattern of each transmission resource is a pattern of a D2D subframe as a transmission resource or a reception resource in a minimum indication period.

Preferably, the location determining unit is configured to: when determining a resource location of a transmission resource of each D2D terminal, determine a location of a fixed resource used for data transmission or reception by the D2D terminal according to a preset rule, and according to the received The resource occupation request determines the location of the non-fixed resource used for data transmission or reception by the D2D terminal.

Preferably, the location notification unit 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, perform data transmission on each D2D terminal in the D2D communication group. The information of the transmission scheme used at the time is notified to the corresponding D2D terminal.

Preferably, the location notification unit is configured to: send, to each D2D terminal in the D2D communication group, an indication signaling, where each indication signaling carries information about a resource location of a transmission resource corresponding to the D2D terminal; or Sending an indication signaling to each D2D terminal in the D2D communication group, where the indication signaling carries information about a resource location of a transmission resource of each D2D terminal.

A base station includes: a memory, a processor, and a radio frequency unit; the memory is configured to store one or more programs executable by the processor; the processor is configured to execute The one or more programs, after receiving the resource occupation request sent by the at least one D2D terminal in the same D2D communication group by the radio frequency unit, determining the D2D communication resource corresponding to the D2D communication group; according to the received resource occupation request, Determining a resource location of a transmission resource of each D2D terminal in the D2D communication group, where a transmission resource of each D2D terminal is located in the D2D communication resource; the transmission resource includes a transmission resource and/or a reception resource; The resource location of the transmission resource of each D2D terminal in the D2D communication group is notified to the corresponding D2D terminal to instruct the corresponding D2D terminal to perform data transmission on the notified transmission resource.

A D2D terminal, the D2D terminal includes: 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 After receiving the resource occupation request sent by the at least one D2D terminal in the D2D communication group, the network side device determines, according to the received resource occupation request, the transmission resource of the D2D terminal determined in the D2D communication resource corresponding to the D2D communication group. The notification of the resource location; the transmission resource includes a transmission resource and/or a reception resource; and the data transmission unit is configured to perform data transmission on the transmission resource of the D2D terminal according to the notification.

Preferably, the D2D terminal further includes: a request sending unit, configured to send a resource occupation request to the network side device before receiving the notification.

Preferably, the resource occupation request sent by the request sending unit includes: The SR sent by the D2D terminal on the network side for the dedicated scheduling request for the D2D link, the SR is used to indicate that the D2D terminal needs to transmit data on the D2D link; and/or the D2D terminal is on the network side. The buffer status report BSR for D2D communication sent on the scheduled physical uplink shared channel PUSCH resource, the BSR is used to indicate the amount of data that the D2D terminal needs to transmit on the D2D link.

Preferably, the notification received by the location notification receiving unit is a notification of the resource location of the transmission resource in the last indication minimum indication period received by the D2D terminal in the current minimum change period; the data transmission unit is configured to: At least one minimum change period, performing data transmission on the transmission resource indicated by the notification; wherein each minimum change period includes L minimum indication periods, and L is an integer not less than one.

Preferably, each of the minimum indication periods includes M subframes, and the M subframes include M1 D2D subframes, where M is an integer greater than 1, and M1 is an integer not less than 1.

Preferably, the D2D terminal further includes: a parameter determining unit, configured to pre-arrange a minimum change period, a minimum indication period, and a value of at least two parameters in the L with the network side device; or, receive a minimum pre-sent by the network side device. The change period, the minimum indication period, and the value of at least two parameters in the L; or, the network side device pre-agreed the minimum change period, the minimum indication period, and the value of one parameter in the L, and the remaining ones received by the network side device in advance The value of at least one parameter.

Preferably, the notification received by the location notification receiving unit further includes the The information of the transmission scheme used by the D2D terminal for data transmission; the data transmission unit is configured to: perform data transmission on the transmission resource of the D2D terminal by using a notification transmission scheme.

Preferably, the location notification receiving unit is further configured to: receive the notification of the resource location of the transmission resource of the D2D terminal sent by the network side device again; the data transmission unit is further configured to: follow from the previous D2D terminal embodiment. The minimum change cycle begins with data transfer on the latest notified transmission resource.

Preferably, the location notification receiving unit is configured to: receive indication signaling sent by the network side device for the D2D terminal, where the indication signaling carries a resource location of a transmission resource of the D2D terminal, according to the foregoing any embodiment of the D2D terminal. Or the indication signaling sent by the network side device to each D2D terminal in the D2D communication group, where the indication signaling carries information about the resource location of the transmission resource of each D2D terminal.

A D2D terminal includes: a memory, a processor, and a radio frequency unit; the memory is configured to store one or more programs, the one or more programs may be executed by the processor; the processor is configured to pass Executing the one or more programs, and receiving, by the radio frequency unit, a notification of a resource location of the 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 that the network side device is receiving After the resource occupation request sent by the at least one D2D terminal in the D2D communication group, the D2D terminal determined in the D2D communication resource corresponding to the D2D communication group according to the received resource occupation request The notification of the resource location of the transmission resource; the transmission resource includes a transmission resource and/or a reception resource; and the data transmission is performed by the radio frequency unit on the transmission resource of the D2D terminal according to the notification.

In this solution, after receiving the resource occupation request sent by the at least one D2D terminal in the same D2D communication group, the network side device determines the D2D communication resource corresponding to the D2D communication group, and determines the D2D communication according to the received resource occupation request. The resource location of the D2D terminal in the group is the resource location in the D2D communication resource, and the resource location of the transmission resource of each D2D terminal is notified to the corresponding D2D terminal, and the D2D terminal receives the transmission resource of the D2D terminal sent by the network side device. After the notification of the resource location, data transmission is performed on the transmission resource of the D2D terminal according to the notification, including data transmission and/or data reception. It can be seen that the solution solves the problem that each D2D terminal in the same D2D communication group uses D2D communication resources to transmit and receive data.

81‧‧‧Resource determination unit

82‧‧‧Location Determination Unit

83‧‧‧Location Notification Unit

84‧‧‧ parameter determination unit

90‧‧‧Location notification receiving unit

91‧‧‧ Data Transfer Unit

92‧‧‧Request sending unit

93‧‧‧Parameter determination unit

51-52, 60-61‧‧‧ steps

1 is a schematic diagram of a N2D link and a D2D link in a prior art; FIG. 2 is a schematic diagram of a data flow of a terminal communication in a cellular network in the prior art; and FIG. 3 is a schematic diagram of a data flow of a direct communication of a terminal in the prior art; 4a is a schematic diagram of a semi-static unidirectional resource configuration manner for D2D communication according to an embodiment of the present invention; FIG. 4b is a schematic diagram of a semi-static bidirectional resource configuration manner for D2D communication according to an embodiment of the present invention; FIG. 6 is a schematic flowchart of another method according to an embodiment of the present invention; FIG. 7 is a schematic flowchart of interaction 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.

The LTE D2D technology refers to D2D communication controlled by an LTE network operating on an LTE licensed frequency band. On the one hand, the advantages of D2D technology can be fully utilized, and the control of the LTE network can also overcome some problems of the traditional D2D technology, such as uncontrollable interference. The introduction of LTE D2D features will enable LTE technology to evolve from pure wireless mobile cellular communication technology to Universal Connectivity Technology.

When D2D communication is introduced into the licensed band of LTE, the D2D communication link will share radio resources with cellular communication, which is also the most basic problem of merging D2D communication technology in cellular systems. The sharing method of radio resources can be divided into two types: sharing in the orthogonal mode and sharing in the multiplexing mode. Radio resource sharing in the orthogonal manner refers to orthogonally dividing radio resources in a static or dynamic manner in the use of radio resources, so that cellular communications and D2D communications use mutually orthogonal resources. The use of multiplexing for wireless resource sharing means that D2D communication uses shared resources for shared use in a reasonable manner and limits interference to a certain level.

In D2D communication, in addition to the one-to-one communication mode between users, a typical application scenario includes group/broadcast communication between D2D users, which can be implemented as follows: one UE transmits through a single transmission. The same data (group communication) is sent to all UEs in one communication group; one UE transmits the same data (broadcast communication) to all authorized nearby UEs by a single transmission.

Group/broadcast communication scenarios can be used for fire and rescue in public safety applications And anti-terrorism and so on.

The Scheduling Request (SR) is used to request the base station to schedule the UE to perform uplink transmission. In the Long Term Evolution (LTE)/Long Term Evolution-Advanced (LTE-A) system, the base station pair The UE that enters the radio resource control (RRC) connection state configures a dedicated periodic SR resource, and the corresponding physical channel is a physical uplink control channel (PUCCH) format 1/1a. /1b resources.

The buffer status report (BSR) is used to report the amount of data included in the buffer of the current uplink transmission of the UE, and is used to assist the base station to schedule allocation of resources during uplink transmission of the UE. Two types of BSRs are defined in the Medium Access Control (MAC) layer, namely: a long BSR and a short BSR. The long BSR reports the buffer status information of the four logical channel groups, and the short BSR reports only one. The BSR of the logical channel group. The reporting of the BSR is triggered by an event, for example, it can be a high-priority data arrival, or a periodic BSR reporting timer timeout. The BSR is carried by the PUSCH scheduled by the base station.

From the perspective of receiving/transmitting D2D terminals, the configuration of time-frequency resources for D2D communication is as follows:

Method 1: A unidirectional resource allocation method, for a given time-frequency resource, it can be configured as a time-frequency resource sent by a D2D terminal, or can be configured as a time-frequency resource received by a D2D terminal, as shown in FIG. 4a. Unidirectional resource configuration can be modified through high-level signaling (reconfiguration process). This method is a semi-static resource allocation method. The advantage of this method is simple, but the main problem of this method is that the reconfiguration delay is relatively large and cannot adapt to the dynamic changes of the service, resulting in low resource utilization. .

Method 2: A bidirectional resource allocation method for a given time-frequency resource, The D2D terminal transmits/receives a common time-frequency resource, and the D2D terminal occupies the current time-frequency resource in a competitive manner on a given time-frequency resource. As shown in Figure 4b. The same time-frequency resource can be configured for the receiving and transmitting of the pair of D2D terminals. The D2D terminal needs to use the current time-frequency resource to perform data transmission in a contentive manner. The advantage of this mode is that the resource utilization is high, and multiple users share the same time-frequency resource. The disadvantage is that each D2D subframe needs to solve the competition of resource occupation between D2D terminals.

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

Referring to FIG. 5, the data transmission method in the D2D communication provided by the network side of the embodiment of the present invention includes the following steps: Step 51: After receiving the resource occupation request sent by at least one D2D terminal in the same D2D communication group, the network side device Determining a D2D communication resource corresponding to the D2D communication group, and determining, according to the received resource occupation request, a resource location of a transmission resource of each D2D terminal in the D2D communication group, where a transmission resource of each D2D terminal is located in the D2D communication resource. The transmission resource includes a transmission resource and/or a reception resource; where 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; Step 52: the network side device associates the D2D communication The resource location of the transmission resource of each D2D terminal in the group is notified to the corresponding D2D terminal to instruct 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: an SR sent by the D2D terminal on the dedicated scheduling request (SR) resource for the D2D link configured by the D2D terminal, where the SR is used to indicate that the D2D terminal needs to be Transmitting data on the D2D link; or the SR sent by the D2D terminal on the dedicated SR resource for the D2D link configured by the D2D terminal, the SR is used to indicate that the D2D terminal needs to transmit data on the D2D link, and The D2D a buffer status report (BSR) for D2D communication sent by the terminal on a physical uplink shared channel (PUSCH) resource scheduled by the network side, where the BSR is used to indicate the amount of data that the D2D terminal 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, and the BSR is used to indicate the amount of data that the D2D terminal needs to transmit on the D2D link.

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

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

Specifically, in step 50, the network side device determines the D2D communication resource corresponding to the D2D communication group, and the specific implementation may be as follows:

First, the network side device determines the communication resource pre-assigned to the D2D communication group, and determines the D2D communication resource corresponding to the D2D communication group; here, the communication resource allocated to the D2D communication group in advance is performed before step 50, Preferably, the network side device may also notify the D2D communication resources in the D2D communication group to the D2D terminals in the D2D communication group.

Second, the network side device allocates the D2D communication resource corresponding to the D2D communication group according to the received resource occupation request. For example, the network side device receives the resource occupation request sent by the three D2D terminals, and determines the number of D2D subframes in a certain period. Taking a radio frame as an example (for the LTE system, for example, a radio frame includes 10 sub-frames. If the resource occupancy request sent by each D2D terminal is determined, it is determined that the corresponding D2D terminal is in one radio frame. By assigning 2 D2D subframes for transmitting data, the D2D communication group can allocate D2D communication resources including 6 D2D subframes in one radio frame. Preferably, the network side device may also notify the D2D communication resources in the D2D communication group to the D2D terminals in the D2D communication group.

In step 50, the resource location of the transmission resource of each D2D terminal in the D2D communication group is determined according to the received resource occupation request, which may be: determining, according to the received resource occupation request, each D2D in the D2D communication group. The resource location of the transmission resource of the terminal in the minimum indication period; 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 to indicate the corresponding D2D The terminal performs data transmission on the notified transmission resource, where the network side device notifies the corresponding D2D terminal of the resource location of the transmission resource in each D2D communication group in a minimum indication period to indicate the corresponding The D2D terminal performs data transmission on the transmission resource indicated by the notification in at least one minimum change period; wherein each minimum change period includes L minimum indication periods, and L is an integer not less than 1.

Preferably, each of the minimum indication periods includes M subframes, and the M subframes include M1 D2D 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 the radio frame of the LTE system (equivalent to an integer multiple of 10 subframes).

The minimum change period indicates that the location of the transmission resource in the D2D communication resource of the D2D terminal is unchanged in at least one minimum change period. The time may be N subframes, and the N subframes may include N1 D2D subframes.

The minimum indication period indicates a period of a pattern of transmission resources in the D2D communication resource indicated by the network side signaling, and may include M subframes in time, wherein the M subframes may include M1 D2D subframes.

The relationship between the minimum change period and the minimum indication period is: a minimum change period may include L minimum indication periods, where L is an integer greater than or equal to 1, and the corresponding minimum change period N=L*M may pass N, L, and The value of any two parameters in M obtains the value of another parameter. The value of any two parameters can be obtained through protocol agreement or high-level signaling configuration.

Specifically, the network side device may pre-arrange the minimum change period, the minimum indication period, and the value of at least two parameters in the L with each D2D terminal; or the network side device pre-sets the minimum change period, the minimum indication period, and at least two of L. The value of the parameter is notified to each D2D terminal; or the network side device and each D2D terminal pre-arrange the minimum change period, the minimum indication period, the value of one parameter in L, and notify the value of the remaining at least one parameter in advance. For each D2D terminal.

For example, a minimum indication period is 10 ms (10 sub-frames) of a radio frame, where subframe 4 and subframe 8 are D2D subframes, and if L is 2, the minimum change period is 20 ms ( 20 subframes), the number of D2D subframes in the corresponding minimum indication period is 2, and the number of D2D subframes in the minimum change 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 further carry a positive integer K indicating the validity time of the notification, and the D2D terminal performs data transmission according to the notification in the K minimum indication periods. After the end of the K minimum indication period, the notification is invalid, 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 continue to transmit data according to the notification, and after receiving the new notification, proceed according to the new notification from the next minimum change period. Data transmission.

The method may also be as follows: when the network side device notifies the corresponding D2D terminal of the resource location of the transmission resource, the notification may further carry a positive integer K indicating the validity time of the notification, and the D2D terminal has a minimum indication of K*L. The data transmission is performed according to the notification in the period, and the notification is invalid after the end of the K*L minimum indication period, 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 continue to transmit data according to the notification, and after receiving the new notification, proceed according to the new notification from the next minimum change period. Data transmission. When L is equal to 1, it is the above method.

Specifically, the network side device determines, according to the received resource occupation request, the resource location of the transmission resource of each D2D terminal in the D2D communication group in a minimum indication period, and the specific implementation may be as follows: for each of the D2D communication groups The D2D terminal selects a pattern from the preset pattern of the plurality of transmission resources (including the transmission resource and/or the reception resource) corresponding to the D2D terminal according to the received resource occupation request, and determines the transmission resource of the D2D terminal according to the pattern. The resource location, wherein the pattern of each transmission resource is a pattern indicating that each D2D subframe in a minimum indication period is a transmission resource or a reception resource.

For example, the description includes four D2D subframes in a minimum indication period. For a pair of D2D terminals, a pattern of transmission resources in a minimum indication period can be seen in Table 1 below:

In Table 1, "1" indicates that the corresponding subframe is a transmission subframe, and "0" indicates that the corresponding subframe is a received 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 data transmission and/or reception by the D2D terminal according to a preset rule, and then according to the received The resource occupation request determines the location of the non-fixed resource used for data transmission or reception by the D2D terminal. The D2D subframe that is fixed to the D2D terminal for data transmission or reception according to the preset rule may be determined according to the identifier information of the D2D terminal. For example, a pair of D2D terminals are used as an example, and the UE1 may be determined according to the identifier information of the UE1. The location of the transmission resource, for example, according to the formula: mod (UE_ID_1, M1), determining the location of the transmission resource of the UE1; determining the location of the reception resource of the UE1 according to the identification information of the UE2, for example, determining the UE1 according to the formula: mod (UE_ID_2, M1) The location of the received resource; where M1 is the number of D2D subframes in the minimum indication period.

The network side may also determine a D2D subframe that is fixed for data transmission or reception by the D2D terminal according to the number of D2D terminals and the number of D2D subframes included in a minimum indication period. For example, some D2D subframes in a predefined pattern are fixed locations that receive resources or send resources.

Still exemplified in Table 1 above: For a pair of D2D terminals, if the minimum indication period of the D2D link includes 4 D2D subframes, the D2D UE1 can be fixed in the D2D subframe 1 to transmit data, and is fixed in the D2D sub-frame. The data is received in the frame 3, wherein the D2D UE2 can be fixed in the D2D subframe 1 to receive the data, and is fixedly transmitted in the D2D subframe 3. For the D2D subframes 2 and 4, the D2D subframes 2 and 4 may be configured to be the transmission resource/reception resource configured as the D2D UE1 or the transmission resource/reception resource configured as the D2D UE2 according to the resource occupancy request sent by the two D2D terminals.

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 further transmit data to each D2D terminal in the D2D communication group. The information of the adopted transmission scheme is notified to the corresponding D2D terminal. The transmission scheme may include a modulation coding scheme or the like.

In the 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. The specific implementation may be as follows: First, the individual indication, that is, the network side device Each D2D terminal in the D2D communication group separately sends an indication signaling, where each indication signaling carries information about a resource location of a transmission resource corresponding to the D2D terminal; the method may be applicable to a pair of D2D terminals performing D2D communication, Or the case where the number of the D2D terminals is relatively small; the second, the 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 the transmission resources of each D2D terminal. Information on the location of the resource. This method can be applied to a pair of D2D terminals that perform D2D communication, or a case where the number of D2D terminals is relatively large.

When the joint indication mode is adopted, two methods may be specifically used. First, the information of the resource locations of the transmission resources of the respective D2D terminals is cascaded in the indication signaling, and the information of the resource locations of the D2D terminals and the transmission resources is used. The corresponding relationship is obtained by other pre-configuration information. Second, the indication signaling includes information of the identification information of each D2D terminal and the resource location of its corresponding transmission resource.

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

First, a bit bitmap is used to indicate that each D2D subframe in a minimum indication period is a transmission resource or a reception resource, for example, “1” indicates a transmission resource, and “0” indicates a reception resource.

Secondly, the index information of the pattern of the transmission resource in a selected minimum indication period is used to indicate that each D2D subframe in the pattern is a transmission resource or a reception resource. The method needs to notify the D2D terminal that the index information of each transmission resource pattern and the corresponding D2D subframe in the corresponding pattern are the transmission resource or the receiving resource.

The indication signaling sent by the network side device may be: control signaling of layer 1 (L1): DCI carried by the PDCCH; in order not to increase the number of blind detections, the bit length of the transmitted DCI may be one of the existing DCI formats. The bit length of the DCI format is the same, for example: the bit length of DCI format 0/1a, the idle bit is filled with 0; or the control signaling of layer 2 (L2): the medium access control (MAC) control unit (CE) carried over the PDSCH Or RRC signaling: high layer signaling carried over the PDSCH.

Specifically, each D2D terminal in the D2D communication group of the network side device respectively sends an indication signaling that carries location information of the transmission resource of the D2D terminal: the network side device passes the D2D terminal in the D2D communication group. a search space of a physical downlink control channel (PDCCH) or an enhanced physical downlink control channel (E-PDCCH) determined by a dedicated D2D radio network temporary identifier (D2D-RNTI) of the D2D terminal, and a dedicated D2D is sent to the D2D terminal. - RNTI scrambled downlink control information (DCI), the DCI carrying information of the resource location of the transmission resource of the D2D terminal; the search space is a user a dedicated search space or a common search space; or, the network side device, for each D2D terminal in the D2D communication group, the user-specific search space of the PDCCH or E-PDCCH determined by the dedicated D2D-RNTI of the D2D terminal, to the D2D terminal Transmitting a DCI that is scrambled by using the dedicated D2D-RNTI, to schedule the D2D terminal to receive information about a resource location of the transmission resource and the reception resource through a physical downlink shared channel (PDSCH); and sending the D2D to the D2D terminal through the PDSCH according to the scheduling result. Information about the transmission resource of the terminal and the resource location of the received resource.

The network side device sends an indication signaling to each D2D terminal in the D2D communication group, where the indication signaling carries information about the resource location of the transmission resource of each D2D terminal: the public network device passes the PDCCH or the E-PDCCH public a search space, or a search space of a PDCCH or an E-PDCCH determined by a D2D-RNTI shared by each D2D terminal in a D2D communication group, transmitting a DCI scrambled using the shared D2D-RNTI, where the DCI carries a D2D communication group Information about the location of the transmission resource of each D2D terminal; the search space is a user-specific search space or a common search space; or the network side device performs a common search through the PDCCH or E-PDCCH for each D2D terminal in the D2D communication group. a space, or a search space of a PDCCH or an E-PDCCH determined by a D2D-RNTI shared by each D2D terminal in a D2D communication group, and transmitting a DCI scrambled using the shared D2D-RNTI to the D2D terminal to schedule the D2D The terminal receives the information of the resource location of the transmission resource through the PDSCH; and sends the information of the transmission resource of each D2D terminal through the PDSCH according to the scheduling result; the search space is a user-specific search space or a public Cable space.

Preferably, the network side device can also notify the D2D communication resources in the D2D communication group to the D2D terminals in the D2D communication group.

Referring to FIG. 6, an embodiment of the present invention is directed to D2D communication provided by a terminal side. The data transmission method includes the following steps: 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; the D2D terminal is a D2D terminal in the D2D communication group, and the notification is a network side device. After receiving the resource occupation request sent by the at least one D2D terminal in the D2D communication group, determining, according to the received resource occupation request, the resource location of the transmission resource of the D2D terminal determined in the D2D communication resource corresponding to the D2D communication group. The transmission resource includes the transmission resource and/or the reception resource; the D2D communication resource corresponding to the D2D communication group refers to the D2D communication resource shared by all the D2D terminals in the D2D communication group; and the D2D terminal can be configured according to the configuration delivered by the network side device. Determining the D2D communication resource corresponding to the D2D communication group; the D2D communication group may include two or more 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 sending resource, the other D2D is terminated on the sending resource. Transmitting data including resource location information received resource, the terminal receives the transmitted data from other D2D on the receiver resources in the received notification.

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

Specifically, the resource occupation request sent by the D2D terminal may include: an SR sent by the D2D terminal on the dedicated scheduling request (SR) resource for the D2D link configured by the D2D terminal, where the SR is used to indicate that the D2D terminal needs to be Transmitting data on the D2D link; or the SR sent by the D2D terminal on the dedicated SR resource for the D2D link configured by the D2D terminal, the SR is used to indicate that the D2D terminal needs to transmit data on the D2D link, and a buffer status report (BSR) for D2D communication sent by the D2D terminal on a physical uplink shared channel (PUSCH) resource scheduled by the network side, where the BSR is used to indicate that the D2D terminal is currently in D2D The amount of data to be transmitted on the link; or the BSR for the D2D communication sent by the D2D terminal on the PUSCH resource scheduled by the network side, the BSR is used to indicate the amount of data that the D2D terminal needs to transmit on the D2D link.

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

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

Specifically, the notification received by the D2D terminal in step 60 is a notification of the resource location of the transmission resource in the last indication minimum indication period received by the D2D terminal in the current minimum change period; correspondingly, in step 61, the D2D terminal according to the Notifying the data transmission on the transmission resource of the D2D terminal, the specific implementation is: the D2D terminal performs data transmission on the transmission resource indicated by the notification for at least one minimum change period; wherein each minimum change period includes L minimum Indicates the period, L is an integer not less than one. Here, when the D2D terminal receives a notification indicating the resource location of the transmission resource in the minimum indication period within the current minimum change period, the D2D terminal performs data transmission according to the transmission resource indicated by the notification in the subsequent at least one minimum change period. When the D2D terminal receives the notification of the resource location indicating the transmission resource in the minimum indication period within the current minimum change period, the D2D terminal performs the transmission resource indicated by the last notification in the subsequent at least one minimum change period. Data transmission.

Specifically, each of the minimum indication periods includes M subframes, where the M subframes include M1 D2D subframes, where M is an integer greater than 1, and M1 is not less than An integer of 1. Preferably, M is an integer multiple of the number of subframes included in the radio frame of the LTE system (equivalent to an integer multiple of 10 subframes).

The minimum change period indicates that the location of the transmission resource in the D2D communication resource of the D2D terminal is unchanged in at least one minimum change period. The time may be N subframes, and the N subframes may include N1 D2D subframes.

The minimum indication period indicates a period of a pattern of transmission resources in the D2D communication resource indicated by the network side signaling, and may include M subframes in time, wherein the M subframes may include M1 D2D subframes.

The relationship between the minimum change period and the minimum indication period is: a minimum change period may include L minimum indication periods, where L is an integer greater than or equal to 1, and the corresponding minimum change period N=L*M may pass N, L, and The value of any two parameters in M obtains the value of another parameter. The value of any two parameters can be obtained through protocol agreement or high-level signaling configuration.

Specifically, the D2D terminal may pre-arrange the minimum change period, the minimum indication period, and the value of at least two parameters in the L with the network side device; or the D2D terminal receives the minimum change period, the minimum indication period, and the L period pre-sent by the network side device. The value of at least two parameters in the D2D terminal and the network side device pre-arrange the minimum change period, the minimum indication period, and the value of one parameter in the L, and the value of the remaining at least one parameter sent by the receiving network side device in advance. .

The notification of the resource location of the transmission resource received by the D2D terminal may further carry a positive integer K indicating the validity time of the notification, and the D2D terminal performs data transmission according to the notification in the K minimum indication periods, after the K minimum indication period ends. The notice takes effect, ie the data transfer is no longer carried out in accordance with the notice. When there is no K in the notification, the D2D terminal will always follow The notification transmits the data until the new notification is received, and the data transmission is performed according to the new notification from the next minimum change period.

The following may also be adopted: the notification of the resource location of the transmission resource received by the D2D terminal may further carry a positive integer K indicating the validity time of the notification, and the D2D terminal performs data transmission according to the notification in the K*L minimum indication periods. The notification takes effect after the end of the K*L minimum indication period, ie the data transmission is no longer carried out in accordance with the notification. When the notification does not carry K, the D2D terminal will continue to transmit data according to the notification, and after receiving the new notification, the data transmission is performed according to the new notification from the next minimum change period. When L is equal to 1, it is the above method.

Preferably, the notification received by the D2D terminal in step 60 further includes information about the transmission scheme used by the D2D terminal for data transmission; correspondingly, in step 61, the D2D terminal uses the notified transmission scheme, and the transmission in the D2D terminal. Data transfer on resources. The transmission scheme may include a modulation coding scheme or the like.

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

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. The specific implementation may be as follows: First, the D2D terminal receives the indication message sent by the network side device to the D2D terminal. The instruction signaling carries the information of the resource location of the transmission resource of the D2D terminal. Second, the D2D terminal receives the indication signaling sent by the network side device for each D2D terminal in the D2D communication group, where the indication signaling is Information carrying the resource location of the transmission resource of each D2D terminal.

The indication signaling sent by the network side device may specifically be: Layer 1 (L1) control signaling: DCI carried by the 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 DCI format in the existing DCI format, for example: DCI format 0 /1a bit length, idle bit filled with 0; or layer 2 (L2) control signaling: medium access control (MAC) control unit (CE) carried over PDSCH; or RRC signaling: high-layer letter carried over PDSCH make.

Specifically, when the D2D terminal receives the indication signaling sent by the network side device to the D2D terminal, the following is specifically: the D2D terminal receives and uses the PDCCH or the enhanced E-PDCCH in the search space determined by the dedicated D2D-RNTI of the D2D terminal. The dedicated D2D-RNTI scrambled DCI, where the DCI carries the location information of the transmission resource of the D2D terminal; the search space is a user-specific search space or a common search space; or the dedicated D2D-RNTI of the D2D terminal at the D2D terminal Receiving, in the user-specific search space of the PDCCH or the E-PDCCH, receiving the DCI scrambled by using the dedicated D2D-RNTI, and acquiring, from the DCI, scheduling information that the network side schedules the D2D terminal to receive the resource location information through the PDSCH; The scheduling signaling receives information of the resource location of the transmission resource of the D2D terminal on the PDSCH.

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 is specifically as follows: the D2D terminal is in the common search space of the PDCCH or the E-PDCCH, or each D2D terminal in the D2D communication group. In the search space of the PDCCH or E-PDCCH determined by the shared D2D-RNTI, the DCI that is sent by the network side device and is scrambled by the shared D2D-RNTI, where the DCI carries the transmission resources of each D2D terminal in the D2D communication group. Capital Information of the source location; the search space is a user-specific search space or a common search space; or, the D2D terminal is determined in the common search space of the PDCCH or the E-PDCCH, or the D2D-RNTI shared by each D2D terminal in the D2D communication group In the search space of the PDCCH or the E-PDCCH, the DCI that is sent by the network side device and is scrambled by the shared D2D-RNTI is obtained, and the scheduling signal that the network side schedules the D2D terminal to receive the resource location information through the PDSCH is obtained from the DCI. And receiving, according to the scheduling signaling, information about resource locations of transmission resources of each D2D terminal on the PDSCH; the search space is a user-specific search space or a common search space.

The network side device in the present invention may be a base station, a relay node (RN), or the like. As shown in FIG. 7, the interaction process between the base station and the D2D terminal is as follows: Step 1: At least one D2D terminal (for example, D2D terminal A and D2D terminal B) in the D2D communication group sends a resource occupation request to the base station; Step 2: Base After receiving the resource occupation request sent by the D2D terminal, the station determines the D2D communication resource corresponding to the D2D communication group (such as the three D2D subframes in FIG. 7), and determines the D2D communication group according to the received resource occupation request. The resource location of the transmission resource of each D2D terminal, for example, the base station in FIG. 7 determines the first two D2D subframes included in the D2D communication resource as the transmission resource of the D2D terminal A, and the latter D2D subframe is determined as the D2D terminal A. Receiving resources, the first two D2D subframes included in the D2D communication resource are determined as the receiving resources of the D2D terminal B, and the latter D2D subframe is determined as the transmitting resource of the D2D terminal B; the base station will be in the D2D communication group The resource location of the transmission resource of each D2D terminal is notified to the corresponding D2D terminal. For example, the base station in FIG. 7 uses the resource configuration indication signaling to set the first two D2D subframes included in the D2D communication resource as the transmission resource, and the latter. D2D child The frame is sent to the D2D terminal A for receiving the indication information of the resource, and the D2D communication resource is included before. The two D2D subframes are sent to the D2D terminal B for receiving the resources, and the latter D2D subframe is sent to the D2D terminal B. Step 3: After the D2D terminal A receives the resource configuration indication signaling, the M minimum change period The first two D2D subframes of the intrinsic D2D communication resource send data to the D2D terminal B, and receive the data sent by the D2D terminal B on the latter D2D subframe; after receiving the indication signaling of the resource configuration, the D2D terminal B Receiving data sent by D2D terminal A on the first two D2D subframes of the D2D communication resource and transmitting data to the D2D terminal A on the next D2D subframe in the M minimum change period; Step 4: At least in the D2D communication group A D2D terminal (for example, D2D terminal A and D2D terminal B) sends a resource occupation request to the base station again; Step 5: After receiving the resource occupation request sent by the D2D terminal again, the base station re-determines the D2D communication resource corresponding to the D2D communication group. (For the three D2D subframes in FIG. 7), according to the received resource occupation request, the resource location of the transmission resource of each D2D terminal in the D2D communication group is re-determined. For example, the base station in FIG. 7 will use the D2D communication resource. contain The previous D2D subframe is determined as the transmission resource of the D2D terminal A, and the latter two D2D subframes are determined as the receiving resources of the D2D terminal A, and the previous D2D subframe contained in the D2D communication resource is determined as the D2D terminal B. Receiving the resource, the last two D2D subframes are determined as the transmission resources of the D2D terminal B; the base station notifies the corresponding D2D terminal of the resource location of the transmission resources of each D2D terminal in the newly determined D2D communication group, for example, FIG. 7 The medium base station transmits the indication information of the previous D2D subframe contained in the D2D communication resource to the transmission resource, and the indication information of the latter two D2D subframes to the reception resource to the D2D terminal A through the indication signaling of the resource configuration, and the D2D communication resource is transmitted. The included D2D subframe is sent to the D2D terminal B for receiving the resource, and the latter two D2D subframes are sent to the D2D terminal B; Step 6: After receiving the resource configuration indication signaling again, the D2D terminal A sends the D2D subframe to the D2D terminal B on the previous D2D subframe of the D2D communication resource from the N minimum change periods starting from the M+1 minimum change period. Data, receiving data sent by the D2D terminal B on the last two D2D subframes; after receiving the resource configuration indication signaling again, the D2D terminal B is within N minimum change periods starting from the M+1 minimum change period The data sent by the D2D terminal A is received on the previous D2D subframe of the D2D communication resource, and the data is sent to the D2D terminal A on the last two D2D subframes.

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 the D2D communication group after receiving a resource occupation request sent by at least one D2D terminal in the same D2D communication group. Corresponding D2D communication resource; 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 in the D2D communication group, where a transmission resource of each D2D terminal is located in the D2D communication resource The transmission resource includes a transmission resource and/or a reception resource. The location notification unit 83 is configured to notify the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal in the D2D communication group, to indicate the corresponding D2D terminal. Data transfer is performed on the notified transmission resource.

Further, the resource determining unit 81 is configured to: determine, by the communication resource allocated in advance to the D2D communication group, a D2D communication resource corresponding to the D2D communication group; or allocate the D2D communication group according to the received resource occupation request. D2D communication resources.

Further, the resource occupation request sent by each D2D terminal received by the resource determining unit 81 includes: an SR sent by the D2D terminal on the dedicated scheduling request SR resource for the D2D link configured by the D2D terminal itself, the SR The BSR is used to indicate that the D2D terminal needs to transmit data on the D2D link; and/or the buffer status report BSR for D2D communication sent by the D2D terminal on the physical uplink shared channel PUSCH resource scheduled by the network side. The amount of data that the D2D terminal currently needs to transmit on the D2D link.

Further, the location determining unit 82 is configured to: determine, 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; the location notification unit 83 is configured to: And notifying, by the D2D terminal in the D2D communication group, the resource location of the transmission resource in the minimum indication period to the corresponding D2D terminal, to indicate that the corresponding D2D terminal is in the transmission resource indicated by the notification in the subsequent at least one minimum change period. Data transmission; wherein each minimum change period includes L minimum indication periods, and L is an integer not less than one.

Further, each of the minimum indication periods includes M subframes, where the M subframes include M1 D2D 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 the radio frame of the Long Term Evolution (LTE) system.

Further, the base station further includes: a parameter determining unit 84, configured to pre-agreed with each D2D terminal a minimum change period, a minimum indication period, and a value of at least two parameters in the L; or Notifying the D2D terminal of the minimum change period, the minimum indication period, and the value of at least two parameters in the L; or, in advance, agreeing with each D2D terminal on the minimum change period, the minimum indication period, and the value of one parameter in L, and The value of the remaining at least one parameter is notified to each D2D terminal in advance.

Further, the location determining unit 82 is configured to: for each D2D terminal in the D2D communication group, select a pattern from a preset pattern of multiple transmission resources corresponding to the D2D terminal according to the received resource occupation request, and follow The pattern determines a resource location of the transmission resource of the D2D terminal, wherein the pattern of each transmission resource is a pattern of a D2D subframe as a transmission resource or a reception resource in a minimum indication period.

Further, the location determining unit 82 is configured to: when determining a resource location of a transmission resource of each D2D terminal, determine, according to a preset rule, a location of a fixed resource used for data transmission or reception by the D2D terminal, and according to the received The resource occupation request determines the location of the non-fixed resource used for data transmission or reception by the D2D terminal.

Further, the location 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, perform data transmission on each D2D terminal in the D2D communication group. The information of the transmission scheme used at the time is notified to the corresponding D2D terminal.

Further, the location notification unit 83 is configured to: send, to each D2D terminal in the D2D communication group, an indication signaling, where each indication signaling carries information about a resource location of a transmission resource corresponding to the D2D terminal; or Sending an indication signaling to each D2D terminal in the D2D communication group, where the indication signaling carries information about a resource location of a transmission resource of each D2D terminal.

The embodiment of the present invention further provides a base station, the base station includes: a memory, a processor, and a radio frequency unit; the memory is configured to store one or more programs, and the one or more programs are executable by the processor; Determining, by using the one or more programs, the D2D communication resource corresponding to the D2D communication group after receiving the resource occupation request sent by the at least one D2D terminal in the same D2D communication group by the radio frequency unit; a resource occupancy request to determine a resource location of a transmission resource of each D2D terminal in the D2D communication group, where a transmission resource of each D2D terminal is located in the D2D communication resource; the transmission resource includes a transmission resource and/or a reception resource; The radio frequency unit notifies the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal in the D2D communication group, to instruct the corresponding D2D terminal to perform data transmission on the notified transmission resource.

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 a network side device; and the D2D terminal is a D2D communication. a D2D communication terminal in the group, the notification is a 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 the at least one D2D terminal in the D2D communication group. The notification of the resource location of the transmission resource of the D2D terminal; the transmission resource includes a transmission resource and/or a reception resource; and the data transmission unit 91 is 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: an SR sent by the D2D terminal on the dedicated scheduling request SR resource for the D2D link configured by the D2D terminal, the SR is used to indicate that the D2D terminal needs to be in the And transmitting the data on the D2D link; and/or the buffer status report BSR for the D2D communication sent by the D2D terminal on the physical uplink shared channel PUSCH resource scheduled by the network side, where the BSR is used to indicate that the D2D terminal is currently required on the D2D link. The amount of data transferred.

Further, the notification received by the location notification receiving unit 90 is a notification of the resource location of the transmission resource in the last indication minimum indication period received by the D2D terminal in the current minimum change period; the data transmission unit 91 is configured to: Subsequent at least one minimum change period, performing data transmission on the transmission resource indicated by the notification; wherein each minimum change period includes L minimum indication periods, and L is an integer not less than 1.

Further, each of the minimum indication periods includes M subframes, where the M subframes include M1 D2D 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 the radio frame of the Long Term Evolution (LTE) system.

Further, the D2D terminal further includes: a parameter determining unit 93, configured to pre-arrange the minimum change week with the network side device Period, minimum indication period, value of at least two parameters in L; or, a minimum change period, a minimum indication period, and a value of at least two parameters in L received by the receiving device on the network side; or, with the network side device in advance The minimum change period, the minimum indication period, and the value of one parameter in the L are agreed, and the value of the remaining at least one parameter pre-transmitted by the network side device is received.

Further, the notification received by the location notification receiving unit 90 further includes information of a transmission scheme used by the D2D terminal to perform data transmission; the data transmission unit 91 is configured to: transmit by using the notified transmission scheme at the D2D terminal. Data transfer on resources.

Further, the location notification receiving unit 90 is further configured to: receive the notification of the resource location of the transmission resource of the D2D terminal sent by the network side device again; the data transmission unit 91 is further configured to: start from a subsequent minimum change period. Data transmission is performed on the notified transmission resource.

Further, the location notification receiving unit 90 is configured to: receive the indication signaling sent by the network side device for the D2D terminal, where the indication signaling carries information about a resource location of the transmission resource of the D2D terminal; or, receives the network side device The indication signaling sent by each D2D terminal in the D2D communication group carries the information of the resource location of the transmission resource of each D2D terminal.

The embodiment of the present invention further provides a D2D terminal, where the D2D terminal includes: a memory, a processor, and a radio frequency unit; the memory is configured to store one or more programs, and the one or more programs can be executed by the processor; a processor for executing the one or more programs through the radio unit Receiving, by the network side device, a resource location of the transmission resource of the D2D terminal; the D2D terminal is a D2D terminal in the D2D communication group, and the notification is that the network side device receives the at least one D2D terminal in the D2D communication group. After the received resource occupation request, the notification of the resource location of the transmission resource of the D2D terminal determined in the D2D communication resource corresponding to the D2D communication group according to the received resource occupation request; the transmission resource includes a transmission resource and/or a reception resource. According to the notification, data transmission is performed by the radio frequency unit on the transmission resource of the D2D terminal.

In summary, the solution provided by the embodiment of the present invention includes: after receiving the resource occupation request sent by at least one D2D terminal in the same D2D communication group, the network side device determines the D2D corresponding to the D2D communication group. The communication resource determines, according to the received resource occupation request, the resource location of the transmission resource of each D2D terminal in the D2D communication group in the D2D communication resource, and notifies the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal. After receiving the notification of the resource location of the transmission resource of the D2D terminal sent by the network side device, the D2D terminal performs data transmission, including data transmission and/or data reception, on the transmission resource of the D2D terminal according to the notification. It can be seen that the solution solves the problem that each D2D terminal in the same D2D communication group uses the D2D communication resource to perform data transmission and reception; and, in this solution, the network side device is D2D according to the received resource occupation request, that is, the service requirement of the D2D terminal. Each D2D terminal in the communication group allocates transmission resources, including transmission resources and/or reception resources, in the D2D communication resource, thereby improving resource utilization of the system, and the network side device uniformly allocates transmission resources for each D2D terminal, which can be avoided. Resource competition issues for multiple D2D terminals in each D2D subframe.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus, and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a general-purpose computer, A processor of a special purpose computer, embedded processor or other programmable data processing device to produce a machine such that instructions executed by a processor of a computer or other programmable data processing device are generated for implementation in a flow chart or A plurality of processes and/or block diagrams of means for a function specified in a block or blocks.

The computer program instructions can also be stored in a computer readable memory that can boot a computer or other programmable data processing device to operate in a particular manner, such that instructions stored in the computer readable memory produce an article of manufacture including the instruction device. The instruction means implements the functions specified in one or more blocks of the flow or in a flow or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device to perform a series of operational steps on a computer or other programmable device to produce computer-implemented processing on a computer or other programmable device. The instructions executed above provide steps for implementing the functions specified in one or more blocks of the flowchart or in a block or blocks of the flowchart.

While the preferred embodiment of the invention has been described, it will be understood that Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

51-52‧‧‧Steps

Claims (34)

A data transmission method in D2D communication, the method includes: after receiving a resource occupation request sent by at least one D2D terminal in the same D2D communication group, the network side device determines the D2D communication resource corresponding to the D2D communication group. Determining, according to the received resource occupation request, a resource location of a transmission resource of each D2D terminal in the D2D communication group, where a transmission resource of each D2D terminal is located in the D2D communication resource; the transmission resource includes a transmission resource and/or a reception The resource vacancy request sent by the D2D terminal includes: an SR sent by the D2D terminal on the dedicated scheduling request SR resource for the D2D link configured by the D2D terminal, where the SR is used to indicate that the D2D terminal needs to be in the D2D chain. And transmitting the data on the road; and/or the buffer status report BSR for the D2D communication sent by the D2D terminal on the physical uplink shared channel PUSCH resource scheduled by the network side, where the BSR is used to indicate that the D2D terminal needs to transmit on the D2D link. The amount of data; 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 data transmission is performed on the notified transmission resource by the corresponding D2D terminal. The data transmission method in the D2D communication according to claim 1, wherein the network side device determines the D2D communication resource corresponding to the D2D communication group, and specifically includes: the network side device pre-allocates the communication resource to the D2D communication group, The D2D communication resource corresponding to the D2D communication group is determined; or the network side device allocates the D2D communication resource corresponding to the D2D communication group according to the received resource occupation request. A data transmission method in D2D communication according to claim 1, wherein the received data is based on And determining, by the resource occupation request, the resource location of the transmission resource of each D2D terminal in the D2D communication group, specifically: determining, according to the received resource occupation request, the transmission resource of each D2D terminal in the D2D communication group in a minimum indication period And 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, to indicate that the corresponding D2D terminal performs data transmission on the notified transmission resource, specifically: The network side device notifies the corresponding D2D terminal of the resource location of the transmission resource in the minimum indication period of each D2D terminal in the D2D communication group, to indicate that the corresponding D2D terminal is in the notification indication in the subsequent at least one minimum change period. Data transmission is performed on the transmission resource; wherein each minimum change period includes L minimum indication periods, and L is an integer not less than 1. The data transmission method in the D2D communication according to claim 3, wherein each of the minimum indication periods includes M subframes, and the M subframes include M1 D2D subframes, where M is greater than 1. An integer, M1 is an integer not less than one. The data transmission method in the D2D communication according to claim 3, further comprising: the network side device and each D2D terminal pre-arranging a minimum change period, a minimum indication period, and a value of at least two parameters in the L; or The roadside device notifies the D2D terminal to the minimum change period, the minimum indication period, and the value of at least two parameters in the L; or the network side device and the D2D terminal pre-agreed the minimum change period, the minimum indication period, and one parameter in the L. The value is set, and the value of the remaining at least one parameter is notified to each D2D terminal in advance. A data transmission method in D2D communication as described in claim 3, wherein the received data is based on And determining, by the resource occupation request, the resource location of the transmission resource of each D2D terminal in the D2D communication group in a minimum indication period, specifically: for each D2D terminal in the D2D communication group, according to the received resource occupation request Selecting a pattern from a preset pattern of the plurality of transmission resources corresponding to the D2D terminal, and determining a resource location of the transmission resource of the D2D terminal according to the pattern, wherein the pattern of each transmission resource is a D2D sub-signal within a minimum indication period. The box acts as a pattern for sending or receiving resources. The data transmission method in the D2D communication according to claim 1, wherein the network side device determines, according to a preset rule, the data transmission or reception for the D2D terminal when determining the resource location of the transmission resource of each D2D terminal. The location of the fixed resource, and determining the location of the non-fixed resource for data transmission or reception by the D2D terminal according to the received resource occupation request. The data transmission method in the D2D communication according to 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 network side further includes: The device notifies the corresponding D2D terminal of the information of the transmission scheme used when each D2D terminal in the D2D communication group performs data transmission. The data transmission method in the D2D communication according to any one of claims 1 to 8, wherein 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 sends an indication signaling to each D2D terminal in the D2D communication group, and each indication signaling carries information about a resource location of a transmission resource corresponding to the D2D terminal; or The network side device sends an indication signaling to each D2D terminal in the D2D communication group, where the indication signaling carries information about resource locations of transmission resources of each D2D terminal. A data transmission method in D2D communication, the method comprising: receiving, by the D2D terminal, a notification of a resource location of a transmission resource of the D2D terminal sent by the network side device; the D2D terminal being a D2D terminal in the D2D communication group, The notification is that after receiving the resource occupation request sent by the at least one D2D terminal in the D2D communication group, the network side device determines the D2D terminal in the D2D communication resource corresponding to the D2D communication group according to the received resource occupation request. a notification of a resource location of the transmission resource; the transmission resource includes a transmission resource and/or a reception resource; the resource occupation request includes: an SR sent by the D2D terminal on the dedicated scheduling request SR resource for the D2D link configured by the D2D terminal on the network side The SR is used to indicate that the D2D terminal needs to transmit data on the D2D link; and/or the buffer status report BSR for D2D communication sent by the D2D terminal on the physical uplink shared channel PUSCH resource scheduled by the network side, and the BSR is used by the DSR terminal. Indicates the amount of data that the D2D terminal needs to transmit on the D2D link; the D2D terminal advances on the transmission resource of the D2D terminal according to the notification. Data transfer. The data transmission method in the D2D communication according to claim 10, wherein before the D2D terminal receives the notification, the method further includes: the D2D terminal sending a resource occupation request to the network side device. The data transmission method in the D2D communication according to claim 10, wherein the notification is a notification of a resource location of the transmission resource in the last indication minimum indication period received by the D2D terminal in the 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 performs data transmission on the transmission resource indicated by the notification for at least one minimum change period; wherein each minimum change period Contains L minimum indication periods, L is an integer not less than 1. The data transmission method in the D2D communication according to claim 12, wherein each of the minimum indication periods includes M subframes, where the M subframes include M1 D2D subframes, where M is greater than 1. An integer, M1 is an integer not less than one. The data transmission method in the D2D communication according to claim 12, further comprising: the D2D terminal and the network side device pre-arranging the minimum change period, the minimum indication period, and the value of at least two parameters in the L; or, the D2D terminal The minimum change period, the minimum indication period, and the value of at least two parameters in the L are received by the network side device; or the D2D terminal and the network side device pre-agreed the minimum change period, the minimum indication period, and the value of one parameter in the L. And receiving, by the network side device, a value of at least one parameter remaining in advance. The data transmission method in the D2D communication according to claim 10, wherein the notification further includes information about a transmission scheme used by the D2D terminal for data transmission; the D2D terminal is on the transmission resource of the D2D terminal according to the notification. Performing data transmission specifically includes: the D2D terminal adopts a notification transmission scheme, and performs data transmission on the transmission resource of the D2D terminal. The data transmission method in D2D communication according to any one of claims 12 to 14, wherein, in D2D After receiving the notification, the terminal further includes: the D2D terminal receives the notification of the resource location of the transmission resource of the D2D terminal sent by the network side device again; and the D2D terminal performs data transmission on the newly notified transmission resource from a subsequent minimum change period. The data transmission method in the D2D communication according to any one of the preceding claims, wherein the D2D terminal receives the notification of the resource location of the transmission resource of the D2D terminal sent by the network side device, specifically: the D2D terminal receiving network. The indication information sent by the roadside device to the D2D terminal, where the indication signaling carries information about the resource location of the transmission resource of the D2D terminal; or the D2D terminal receiving network side device sends the D2D terminal in the D2D communication group. Indicated signaling, which carries information about resource locations of transmission resources of each D2D terminal. A base station, the base station includes: a resource determining unit, configured to determine a D2D communication resource 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; 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 in the D2D communication group, where a transmission resource of each D2D terminal is located in the D2D communication resource; the transmission resource includes sending a resource and/or a receiving resource; a location notifying unit, configured to notify a corresponding D2D terminal of a resource location of a transmission resource of each D2D terminal in the D2D communication group, to instruct the corresponding D2D terminal to perform data on the notified transmission resource The resource occupancy request sent by the D2D terminal received by the resource determining unit includes: a dedicated scheduling request for the D2D link configured by the D2D terminal on the network side An SR sent on the source, the SR is used to indicate that the D2D terminal needs to transmit data on the D2D link; and/or the buffer status of the D2D communication sent by the D2D terminal on the physical uplink shared channel PUSCH resource scheduled by the network side The BSR is reported, and the BSR is used to indicate the amount of data that the D2D terminal needs to transmit on the D2D link. The base station according to claim 18, wherein the resource determining unit is configured to: determine a communication resource pre-assigned to the D2D communication group as a D2D communication resource corresponding to the D2D communication group; or, according to the received resource The occupancy request allocates D2D communication resources corresponding to the D2D communication group. The base station according to claim 18, wherein the location determining unit is configured to: determine, 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; The location notification unit is configured to: notify, by the D2D terminal in the D2D communication group, the resource location of the transmission resource in the minimum indication period to the corresponding D2D terminal, to indicate that the corresponding D2D terminal is in the at least one minimum change period Data transmission is performed on the transmission resource indicated by the notification; wherein each minimum change period includes L minimum indication periods, and L is an integer not less than one. The base station according to claim 20, wherein each of the minimum indication periods includes M subframes, wherein the M subframes include M1 D2D subframes, where M is an integer greater than 1, and M1 is not An integer less than one. The base station according to claim 20, wherein the base station further includes: a parameter determining unit, configured to pre-agreed with each D2D terminal a minimum change period, a minimum indication period, and a value of at least two parameters in L; or Notifying the D2D terminal of the minimum change period, the minimum indication period, and the value of at least two parameters in the L; or, in advance, agreeing with each D2D terminal on the minimum change period, the minimum indication period, and the value of one parameter in L, and The value of the remaining at least one parameter is notified to each D2D terminal in advance. The base station according to claim 20, wherein the location determining unit is configured to, for each D2D terminal in the D2D communication group, select a plurality of transmission resources corresponding to the D2D terminal according to the received resource occupation request. A pattern is selected in the pattern, and a resource location of the transmission resource of the D2D terminal is determined according to the pattern, wherein the pattern of each transmission resource is a pattern of a D2D subframe as a transmission resource or a reception resource in a minimum indication period. The base station according to claim 18, wherein the location determining unit is configured to: when determining a resource location of a transmission resource of each D2D terminal, determine, according to a preset rule, a fixed for data transmission or reception by the D2D terminal. The location of the resource, and determining the location of the non-fixed resource for data transmission or reception by the D2D terminal according to the received resource occupation request. The base station according to claim 18, wherein the location notification unit 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 D2D communication group The information of the transmission scheme used when each D2D terminal performs data transmission is notified to the corresponding D2D terminal. The base station according to any one of claims 18 to 25, wherein the location notification unit is configured to: send an indication signaling to each D2D terminal in the D2D communication group, where each indication signaling carries a corresponding Information about the resource location of the transmission resource of the D2D terminal; or sending an indication signaling to each D2D terminal in the D2D communication group, where the indication signaling is carried Information about the resource location of the transmission resource of each D2D terminal. A 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 The notification is the D2D terminal determined by the network side device in the D2D communication resource corresponding to the D2D communication group according to the received resource occupation request after receiving the resource occupation request sent by the at least one D2D terminal in the D2D communication group. a notification of a resource location of the transmission resource; the transmission resource includes a transmission resource and/or a reception resource; and a data transmission unit configured to perform data transmission on the transmission resource of the D2D terminal according to the notification; The request includes: an SR sent by the D2D terminal on the dedicated scheduling request SR resource for the D2D link configured by the D2D terminal, the SR is used to indicate that the D2D terminal needs to transmit data on the D2D link; and/or the D2D terminal A buffer status report BSR for D2D communication sent on a physical uplink shared channel PUSCH resource scheduled by the network side, the BSR is used for Indicates the amount of data that the D2D terminal currently needs to transmit on the D2D link. The D2D terminal of claim 27, 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. The D2D terminal according to claim 27, wherein the notification received by the location notification receiving unit is a notification of a resource location of a transmission resource in the last indication minimum indication period received by the D2D terminal in the current minimum change period; The data transmission unit is configured to: perform data transmission on the transmission resource indicated by the notification for the subsequent at least one minimum change period; wherein each minimum change period includes L minimum indication periods, and L is an integer not less than 1. The D2D terminal according to claim 29, wherein each of the minimum indication periods includes M subframes, wherein the M subframes include M1 D2D subframes, where M is an integer greater than 1, and M1 is not An integer less than one. The D2D terminal according to claim 29, wherein the D2D terminal further includes: a parameter determining unit, configured to pre-arrange a minimum change period, a minimum indication period, and a value of at least two parameters in the L with the network side device; or The minimum change period, the minimum indication period, and the value of at least two parameters in the L are received by the network side device; or the minimum change period, the minimum indication period, and the value of one parameter in the L are pre-agreed with the network side device, and the receiving is received. The value of the remaining at least one parameter pre-sent by the network side device. The D2D terminal of claim 27, wherein the notification received by the location notification receiving unit further includes information of a transmission scheme used by the D2D terminal for data transmission; the data transmission unit is configured to: use a notification transmission scheme Data transmission is performed on the transmission resource of the D2D terminal. The D2D terminal according to any one of the preceding claims, wherein the location notification receiving unit is further configured to: receive the notification of the resource location of the transmission resource of the D2D terminal sent by the network side device again; the data transmission unit further Used to: transmit data on the latest notified transmission resource from the subsequent minimum change cycle. The D2D terminal according to any one of claims 27 to 32, wherein the location notification receiving unit is configured to: receive indication signaling sent by the network side device for the D2D terminal, where the indication signaling carries the transmission of the D2D terminal The information about the resource location of the resource; or the indication information sent by the network side device for each D2D terminal in the D2D communication group, the indication signaling carries information about the resource location of the transmission resource of each D2D terminal.