WO2014187336A1

WO2014187336A1 - Data transmission method and device in d2d communications

Info

Publication number: WO2014187336A1
Application number: PCT/CN2014/078114
Authority: WO
Inventors: 赵锐; 高秋彬; 陈文洪; 彭莹; 张然然
Original assignee: 电信科学技术研究院
Priority date: 2013-05-23
Filing date: 2014-05-22
Publication date: 2014-11-27
Also published as: CN104184540A; TW201446069A; TWI516161B; CN104184540B

Abstract

Disclosed are a data transmission method and device in device-to-device (D2D) communications, relating to the field of wireless communications, and used to solve a problem of how each D2D terminal in a same D2D communications group sends and receives data by using a D2D communications resource. In this solution, a network side device receives a resource occupation request sent by at least one D2D terminal in a same D2D communications group, determines a D2D communications resource corresponding to the D2D communications group, determines, according to the received resource occupation request, a resource location of a transmission resource of each D2D terminal in the D2D communications group, the transmission resource of each D2D terminal being in the D2D communications resource, and sends a notification indicating the resource location of the transmission resource of each D2D terminal to a corresponding D2D terminal, and the corresponding D2D terminal transmits data on the transmission resource of the D2D terminal. It can be seen that, this solution solves the problem of how each D2D terminal in a same D2D communications group sends and receives data by using a D2D communications resource.

Description

Data transmission method and device in D2D communication The present application claims priority to Chinese patent application filed on May 23, 2013, the Chinese Patent Office, Application No. 201310195469.0, and entitled "Data Transmission Method and Apparatus in D2D Communication" The entire contents of which are incorporated herein by reference. TECHNICAL FIELD The present application relates to the field of wireless communications, and in particular, to a data transmission method and apparatus in D2D communication. BACKGROUND OF THE INVENTION A device-to-device (D2D) (also referred to as a terminal direct communication) communication system under the control of a cellular network defines a communication link between D2D terminals as a D2D link for convenience of description. Device-to-device link), the cellular communication link between the network and the D2D terminal is called 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) / the uplink subframe (Time Division Duplex (TDD) system) is used, and the downlink carrier (FDD system) is used. The consideration of the downlink sub-frame (TDD system) is as follows: For the downlink/downlink carrier, the following occurs: The user equipment (UE) receives the data transmitted on the N2D link of the base station (including at least the physical The data of the downlink control channel (PDCCH) is transmitted on the D2D link, so that the UE needs to perform transceiving after receiving the PDCCH, and for the demodulation of the PDCCH, Receiving multi-column cell-specific reference signals (CRS) for demodulation to obtain better PDCCH demodulation performance, then considering the time of transceiving and converting, it can be used for D2D in downlink/downlink carriers. Link Orthogonal Frequency Division Multiplexing (OFDM) symbol for transmission a bit less. Therefore, the uplink/uplink carrier is preferred as the resource for D2D data transmission.

Generally, for a group of D2D terminals, the network side semi-statically configures the shared time-frequency resources 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 with each other via the base station (e B ) where they reside and the core network.

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. Short-distance communication characteristics and direct communication of D2D technology itself The signaling method has the following advantages: The terminal short-distance direct communication method can achieve higher data rate, lower delay and lower power consumption; utilizes the widely distributed user terminals in the network and the short-distance characteristics of the D2D communication link The effective use of spectrum resources can be realized; D2D direct communication can adapt to the local data sharing requirements of services such as wireless P2P, and provide flexible adaptive data services; D2D direct communication can utilize a large number of widely distributed communications in the network The terminal expands 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. SUMMARY OF THE INVENTION 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 utilizes D2D communication resources for data transmission and reception.

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

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. a resource location of a transmission resource of each D2D terminal in the 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 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 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-assigns the communication resource allocated to the D2D communication group, and determines the D2D corresponding to the D2D communication group. Communication resources; 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:

The D2D terminal configures, on the network side, a dedicated scheduling request for the D2D link, the SR sent on the SR resource, 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 BS 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 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, a resource location of a transmission resource of each D2D terminal in the D2D communication group in a minimum indication period; 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 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 one.

Preferably, 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.

Preferably, the method further comprises:

The network side device and each D2D terminal pre-agreed the minimum change period, the minimum indication period, and the values of at least two parameters in L; or

The network side device notifies the D2D terminals to the D2D terminals in advance, 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 each D2D terminal pre-agreed the minimum change period, the minimum indication period, and the value of one parameter in L, and notified the values of the remaining at least one parameter to each D2D terminal in advance.

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:

And selecting, according to the received resource occupation request, a pattern from the preset patterns of the plurality of transmission resources corresponding to the D2D terminal, and determining, according to the pattern, the D2D terminal according to the received resource occupation request. A resource location of a transmission resource, wherein the pattern of each transmission resource is a pattern of a D2D subframe within a minimum indication period as a transmission resource or a reception resource.

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 for data transmission or reception by the D2D terminal.

Preferably, when the network side device notifies the resource location of the transmission resource of each D2D terminal in the D2D communication group to the corresponding D2D terminal, the method further includes:

The network side 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.

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, which specifically includes:

The network side device sends an indication signaling to each D2D terminal in the D2D communication group, 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 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 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 that the network side device receives the D2D communication group. a notification of a resource location of a 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 after the resource occupation request sent by the D2D terminal; the transmission resource includes sending Resources and/or receiving resources;

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 sends a resource occupation request to the network side device.

Preferably, the resource occupation request includes:

The dedicated scheduling request for the D2D link configured by the D2D terminal for the D2D link on the network side, the SR sent on the SR resource, the SR is used to indicate that the D2D terminal needs to transmit data on the D2D link; and/or

The D2D terminal reports the buffer status report for the D2D communication sent by the DSCH terminal on the 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 is a notification that the D2D terminal receives the resource location of the transmission resource in the minimum indication period in the last 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 includes L minimum indication periods, and L is an integer not less than 1.

Preferably, each minimum indication period 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.

Preferably, the method further comprises:

The D2D terminal and the network side device pre-agreed the minimum change period, the minimum indication period, and the values of at least two parameters in the L; or

The D2D terminal receives the minimum change period, the minimum indication period, and the value of at least two parameters in the L transmitted 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 received the value of the remaining at least one parameter pre-transmitted by the network side device.

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

Based on any of the foregoing terminal side method embodiments, preferably, after the D2D terminal receives the notification, further wrapping 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; the D2D terminal performs data transmission on the newly notified transmission resource from the subsequent minimum change period.

The D2D terminal receives the network-side device, and the D2D terminal receives the

The notification of the resource location of the transmission resource of the D2D terminal specifically includes:

The D2D terminal receives the indication signaling sent by the network side device for 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 receives the indication signaling sent by the network side device for 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 base station, the base station comprising:

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; Resources include sending resources and/or receiving resources;

The location notification unit 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 instruct the corresponding D2D terminal to perform data transmission on the notified transmission resource.

Preferably, the resource determining unit is configured to:

Determining a communication resource pre-assigned to the D2D communication group as a D2D communication resource corresponding to the D2D communication group; or

And allocating 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 received by the resource determining unit includes: sending, by the D2D terminal, a dedicated scheduling request for the D2D link, which is configured by the D2D terminal, on the SR resource.

S, 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 location determining unit is configured to:

Determining, 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 used to:

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 notification in the at least one minimum change period Data transmission is performed on the indicated transmission resource; wherein each minimum change period includes L minimum indication periods, and L is an integer not less than one.

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 L; or

Notifying the D2D terminals of the minimum change period, the minimum indication period, and the value of at least two parameters in L; 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 notified to each D2D terminal in advance.

Preferably, the location determining unit is configured to:

Determining, according to a preset rule, a location of a fixed resource used for data transmission or reception by the D2D terminal, and determining, according to the received resource occupation request, for the D2D terminal to perform, when determining a resource location of a transmission resource of each D2D terminal. The location of non-fixed resources that the data is sent or received.

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

Preferably, the location notification unit is configured to:

And transmitting, to each of the D2D terminals 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, the base station comprising:

a processor, the processor is configured to: after each 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; according to the received resource occupation Requesting, determining resource locations of transmission resources of each D2D terminal in the D2D communication group, wherein each D2D terminal The transmission resource of the terminal is located in the D2D communication resource; the transmission resource includes a transmission resource and/or a reception resource; and a radio frequency unit configured to: allocate resources of transmission resources of each D2D terminal in the D2D communication group The location 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 that the network side device receives the 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 after the resource occupation request sent by the at least one D2D terminal in the D2D communication group; 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.

Preferably, the D2D terminal further includes:

And 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 dedicated scheduling request for the D2D link configured by the D2D terminal for the D2D link on the network side, the SR sent on the SR resource, the SR is used to indicate that the D2D terminal needs to transmit data on the D2D link; and/or,

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 used to:

For at least one subsequent 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.

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

Receiving a minimum change period, a minimum indication period, and a value of at least two parameters in the L transmitted by the network side device; or

The network side device pre-arranges the minimum change period, the minimum indication period, and the value of one parameter in the L, and receives the value of the remaining at least one parameter sent in advance by the network side device.

Preferably, the notification received by the location notification receiving unit further includes when the D2D terminal performs data transmission. Information about the transmission scheme used;

The data transmission unit is used to:

The data transmission is performed on the transmission resource of the D2D terminal by using the 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, according to any of the foregoing D2D terminal embodiments;

The data transmission unit is further configured to: perform data transmission on the newly notified transmission resource from a subsequent minimum change period.

Based on any of the foregoing D2D terminal embodiments, preferably, the location notification receiving unit is configured to:

Receiving indication signaling sent by the network side device to the D2D terminal, where the indication signaling carries information about a resource location of a transmission resource of the D2D terminal; or

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

A D2D terminal, the D2D terminal includes:

a processor, configured to: receive, by the radio frequency unit, a notification of a resource location of a transmission resource of the D2D terminal sent by the network side device; the D2D terminal is a D2D terminal in the D2D communication group, and the notification is a network side After receiving the resource occupation request sent by the at least one D2D terminal in the D2D communication group, the device determines the transmission resource of 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; the transmission resource includes a transmission resource and/or a reception resource; and performing data transmission by using a radio frequency unit on the transmission resource of the D2D terminal according to the notification;

The radio frequency unit is configured to: receive, under the control of the processor, a notification of a resource location of the transmission resource of the D2D terminal sent by the network side device, and perform data transmission under the control of the processor.

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 resource according to the received resource occupation request. The resource location of the D2D communication resource in the D2D communication group is used to notify the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal in the resource location of the D2D communication resource, and the D2D terminal receives the D2D terminal sent by the network side device. After the notification of the resource location of the transmission resource, 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 of how each D2D terminal in the same D2D communication group utilizes D2D communication resources for data transmission and reception. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram of an N2D link and a D2D link in the prior art;

2 is a schematic diagram of data flow of terminal communication in a cellular network in the prior art; 3 is a schematic diagram of a data flow of direct connection communication of a terminal in the prior art;

4a is a schematic diagram of a semi-static unidirectional resource configuration manner of D2D communication in an embodiment of the present application;

4b is a schematic diagram of a semi-static bidirectional resource configuration manner for D2D communication in an embodiment of the present application;

FIG. 5 is a schematic flowchart of a method provided by an embodiment of the present application;

FIG. 6 is a schematic flowchart of another method according to an embodiment of the present application;

7 is a schematic diagram of an interaction process between a network side and a terminal side in the embodiment of the present application;

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

FIG. 9 is a schematic structural diagram of a terminal according to an embodiment of the present application. detailed description

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 LTE network can also overcome some problems of 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. There are two ways to share wireless resources: sharing in orthogonal mode and sharing in multiplexing mode. The use of orthogonal mode for radio resource sharing 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 multiplexed mode for wireless resource sharing means that D2D communication shares the reuse of the used cellular resources in a reasonable manner and limits the interference to a certain level.

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

One UE transmits the same data (group communication) to all UEs in one communication group by a single transmission; one UE transmits the same data (broadcast communication) to all authorized UEs in a single transmission by a single transmission.

Group/broadcast communication scenarios can be used for fire, rescue, and counter-terrorism in public safety applications.

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 enters the wireless network. The Radio Resource Control (RRC) connection state of the UE is configured with a dedicated periodic SR resource, and the corresponding physical channel is the Physical Uplink Control Channel (PUCCH) format (format) 1/la/lb. resource of.

The Buffer status Report (BSR) is used to assist the base station in scheduling the allocation of resources during uplink transmission of the UE by using the amount of data included in the buffer of the current uplink transmission of the UE. In the media The medium access control (MAC) layer defines two types of BSRs, 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 logical channel group. BSR. The reporting of the BSR is triggered by an event. For example, the event may 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 D2D terminal receiving/transmitting, the configuration of time-frequency resources for D2D communication is as follows: Method 1: Unidirectional resource configuration method, for a given time-frequency resource, it can be configured as D2D The time-frequency resource sent by the terminal, or can be configured as the time-frequency resource received by the D2D terminal, as shown in Figure 4a. Unidirectional resource configuration can be modified by high-level signaling (reconfiguration process). This method is a semi-static resource allocation method. The advantage of this method is simple. However, the main problem of this method is that the delay of reconfiguration is relatively large, and it cannot adapt to the dynamic changes of services, resulting in comparison of resource utilization. low.

Method 2: A bidirectional resource allocation method, for a given time-frequency resource, configured to transmit/receive a shared time-frequency resource by a D2D terminal, and the D2D terminal occupies the current state by means of contention on a given time-frequency resource. Time-frequency resources. As shown in Figure 4b. The same time-frequency resource can be configured for the receiving and sending of a pair of D2D terminals. The D2D terminal needs to use the current time-frequency resource to transmit data in the currently configured time-frequency resource. The advantage of this method is that the resource utilization is high, and multiple users share the same time-frequency resource. The disadvantage is that the competition for resource occupation between D2D terminals needs to be solved in each D2D subframe.

The present application 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 application includes the following steps:

Step 50: 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 according to the received resource occupation request. a resource location of a transmission resource of each D2D terminal in the communication group, wherein 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 D2D communication resources shared by all D2D terminals in the D2D communication group;

Step 51: The network side device notifies the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal in the D2D communication group, 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 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 needs to be transmitted on the D2D link. Number Or a BSR for D2D communication sent by the D2D terminal on the 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.

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 D2D terminals in the same group, different dedicated SR resources need to be configured to distinguish different D2D terminals. 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. A dedicated SR resource can occupy a physical uplink control channel (PUCCH) format (format) 1/la/lb of resources.

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 one radio frame as an example (taking the LTE system as an example, a radio frame includes 10 subframes). If, according to the resource occupation request sent by each D2D terminal, it is determined that the corresponding D2D terminal needs to allocate two D2D subframes for transmitting data in one radio frame, then the D2D communication group may be allocated in one radio frame. A D2D communication resource containing 6 D2D subframes. 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 in the minimum indication period of the terminal; 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 minimum indication period 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. 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).

Wherein, the minimum change period indicates that the D2D terminal is in the D2D communication resource at least in a minimum change period. The location of the transmission resource in the source does not change. The time may be N subframes, where N subframes may include N1 D2D subframes.

The minimum indication period indicates the period of the pattern of the transmission resource in the D2D communication resource indicated by the network side signaling, which 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, which 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

E.g:

A minimum indication period is 10 ms (10 subframes) of a radio frame, where subframe 4 and subframe 8 are D2D subframes, and if L is 2, then the minimum change period is 20 ms (20 sub-frames), correspondingly The number of D2D subframes in the 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 always perform data transmission 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 also 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 always perform data transmission 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 D2D terminal in the D2D communication group, the D2D is preset from the received resource occupation request. Selecting a pattern from a pattern of a plurality of transmission resources (including a transmission resource and/or a reception resource) corresponding to the terminal, and determining a resource location of the transmission resource of the D2D terminal according to the pattern, where a pattern of each transmission resource indicates a Each D2D subframe within the minimum indication period is a pattern that is a transmission resource or a reception resource.

For example, the case where the minimum indication period includes four D2D subframes is taken as an example. For a pair of D2D terminals, the pattern of the transmission resources in a minimum indication period can be seen in the following table 1:

Table 1

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

Further, when determining the resource location of the transmission resource of each D2D terminal, the network side device may first determine the location of the fixed resource used for 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-stationary resource for data transmission or reception by the D2D terminal.

The determining, according to the preset rule, the D2D subframe that is fixed for the data transmission or reception by the D2D terminal, 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 sending of the UE1 may be determined according to the identifier information of the UE1. The location of the resource, for example, according to the formula: mod (UE_ID-1, Ml), determine the location of the transmission resource of UE1; determine the location of the received resource of UE1 according to the identification information of UE2, for example according to the formula: mod (UE ID 2, Ml) Determining the location of the received resource of UE1; where M1 is the number of D2D subframes in the minimum indication period.

The network side may also determine a D2D subframe 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 sub-frames in a predefined pattern are fixed to receive resources or to 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 may be fixed in the D2D subframe 1 to transmit data, and fixed in the D2D sub-frame. Receive data in frame 3, where D2D UE2 can be fixed in D2D subframe 1 to receive data, fixed in D2D subframe 3 to transmit data, and for D2D subframes 2 and 4 can be used according to resources transmitted by two D2D terminals. The request determines whether it is a transmission resource/reception resource configured as D2D UE1, or is configured as a transmission resource/reception resource of D2D UE2.

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 perform data transmission on 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 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, a separate indication, that is, the network side device separately sends an indication signaling to each D2D terminal in the D2D communication group, where each indication signaling carries information of a resource location of a transmission resource corresponding to the D2D terminal; It can be applied to a pair of D2D terminals that perform D2D communication, or when the number of D2D terminals is relatively small;

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 information about the resource location of the transmission resource of each D2D terminal. 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, the following two methods can be 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 correspondence between the information of the resource locations of the D2D terminals and the resource locations of the transmission resources is obtained by using other pre-configuration information; Second, the indication information includes the identification information of each D2D terminal and the information of the resource location of the 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, the bitmap is used to indicate that each D2D subframe in the minimum indication period is a transmission resource or Receive resources, such as "1" for sending resources and "0" for receiving resources.

Second, the index (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 of the index information of the pattern of each transmission resource and the information of each D2D subframe in the corresponding pattern as a transmission resource or a reception resource.

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/la bit length, free bit filled with 0; or

Layer 2 (L2) control signaling: a Media 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 separately sends an indication signaling for carrying the location information of the transmission resource of the D2D terminal:

The network side device, for each D2D terminal in the D2D communication group, 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 a search space, transmitting, to the D2D terminal, downlink control information (DCI) scrambled by the dedicated D2D-RNTI, where the DCI carries information of a resource location of a transmission resource of the D2D terminal; the search space is a user-specific search Space or public search space; or,

The network side device sends, to each D2D terminal in the D2D communication group, a dedicated search space of the PDCCH or the E-PDCCH determined by the dedicated D2D-RNTI of the D2D terminal, and sends a dedicated D2D-RNTI scrambling to the D2D terminal. The DCI, in order to schedule the D2D terminal to receive the information of the resource location of the transmission resource and the reception resource through the physical downlink shared channel (PDSCH); and send the transmission resource of the D2D terminal and the resource location of the reception resource to the D2D terminal through the PDSCH according to the scheduling result. Information.

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 network side device sends a shared D2D-RNTI by using the shared search space of the PDCCH or the E-PDCCH, or the search space of the PDCCH or the E-PDCCH determined by the D2D-RNTI shared by each D2D terminal in the D2D communication group. a DCI that carries information about a transmission resource location of each D2D terminal in the D2D communication group; the search space is a user-specific search space or a common search space; or

The PDCCH or E-PDCCH search space determined by the network side device for each D2D terminal in the D2D communication group by the common search space of the PDCCH or the E-PDCCH, or by the D2D-RNTI shared by each D2D terminal in the D2D communication group Transmitting, by the D2D terminal, a DCI that is scrambled by using the shared D2D-RNTI, to schedule information about a resource location of the D2D terminal to receive the transmission resource through the PDSCH, and transmitting, by using the PDSCH, information about the transmission resource of each D2D terminal according to the scheduling result. ; The search space is a user-specific search space or a public search 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, the data transmission method in D2D communication provided by the terminal side of the embodiment of the present application 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 that the network side device receives the D2D communication group. 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 after the resource occupancy request sent by the at least one D2D terminal; the transmission resource includes the transmission resource And/or receiving resources; the D2D communication resource corresponding to the D2D communication group refers to the D2D communication group The D2D communication resource shared by all the D2D terminals in the D2D terminal; the D2D terminal may determine the D2D communication resource corresponding to the D2D communication group according to the configuration information delivered by the network side device; 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 transmission resource, the D2D terminal sends the resource to the other D2D terminal. The data, when the received notification includes the resource location information of the received resource, receives data sent by the other D2D terminal on the received resource.

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 needs to be transmitted on the D2D link. The amount of data; or the BSR for the D2D communication sent by the D2D terminal on the 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.

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 only for the D2D terminal to send the SR through the D2D link.

The network side needs to configure a dedicated SR resource for each D2D terminal in the system. For D2D terminals in the same group, different dedicated SR resources need to be configured to distinguish different D2D terminals. 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 1/la/lb of the physical uplink control channel (PUCCH) format.

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 that the data transmission is performed on the transmission resource of the D2D terminal, where 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 The minimum indication 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 an integer not less than one. Preferably, M is an integer multiple of the number of subframes included in the radio frame of the LTE system (corresponding 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 for at least one minimum change period. It may be N subframes in time, and N subframes may include N1 D2D subframes.

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 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 notification takes effect, ie data transmission is no longer carried out in accordance with the notification. When there is no K in the notification, the D2D terminal will continue to transmit data according to the notification, and after receiving the new notification, the data transmission will be 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 performed according to the notification. When there is no K in the notification, the D2D terminal will continue to transmit data according to the notification, and after receiving the new notification, the data transmission will be 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 a transmission scheme used by the D2D terminal for data transmission; and correspondingly, in step 61, the D2D terminal uses the notified transmission scheme at the D2D terminal. Data transmission on the transmission resource. 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 the latest notified transmission resource from the subsequent minimum change period. data 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, and the specific implementation may be as follows:

First, the D2D terminal receives the indication signaling sent by the network side device for the D2D terminal, where the indication 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 carries information about the resource location of the transmission resource of each _D2D terminal.

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

Layer 2 (L2) control signaling: a Media Access Control (MAC) Control Unit (CE) carried over the PDSCH; or

RRC signaling: High layer signaling carried over the PDSCH.

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

The D2D terminal receives, in the search space of the PDCCH or the enhanced E-PDCCH determined by the dedicated D2D-RNTI of the D2D terminal, the DCI that is scrambled by using the dedicated D2D-RNTI, 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 public search space; or

The D2D terminal receives the DCI scrambled using the dedicated D2D-RNTI in the user-specific search space of the PDCCH or the E-PDCCH determined by the dedicated D2D-RNTI of the D2D terminal, and acquires the D2D terminal from the DCI to obtain the D2D terminal through the PDSCH. Receiving scheduling signaling of the resource location information; receiving, according to the scheduling signaling, information of a 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 as follows:

The D2D terminal uses the sharing in the common search space of the PDCCH or the E-PDCCH, or in the search space of the PDCCH or E-PDCCH determined by the D2D-RNTI shared by each D2D terminal in the D2D communication group, in the search space of the PDCCH or the E-PDCCH determined by the D2D-RNTI. a D2D-RNTI scrambled DCI, where the DCI carries information about a resource location of a transmission resource of each D2D terminal in the D2D communication group; the search space is a user-specific search space or a common search space; or

The D2D terminal uses the sharing in the common search space of the PDCCH or the E-PDCCH, or in the search space of the PDCCH or E-PDCCH determined by the D2D-RNTI shared by each D2D terminal in the D2D communication group, in the search space of the PDCCH or the E-PDCCH determined by the D2D-RNTI. Decoding DCI of the D2D-RNTI, obtaining, from the DCI, scheduling signaling for the D2D terminal to receive resource location information by using the PDSCH; and receiving, according to the scheduling signaling, a resource location of a transmission resource of each D2D terminal on the PDSCH Information; The search space is a user-specific search space or a public search space.

The network side device in this application may be a device such as a base station or a relay node (RN). As shown in Figure 7, the base station and The interaction process of 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: After receiving the resource occupation request sent by the D2D terminal, the base station determines the D2D communication resource corresponding to the D2D communication group (such as 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 in the network, for example, the base station 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 the resource, and determining the first two D2D subframes included in the D2D communication resource as the receiving resources of the D2D terminal B, and the latter D2D subframe as the sending resource of the D2D terminal B;

The base station notifies the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal in the D2D communication group. 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 to Sending the resource, the indication information of the next D2D subframe as the receiving resource is sent to the D2D terminal A, and the indication information that the first two D2D subframes included in the D2D communication resource are the receiving resource and the latter D2D subframe is the transmitting resource is sent to the D2D. Terminal B;

Step 3: After receiving the resource configuration indication signaling, the D2D terminal A sends data to the D2D terminal B on the first two D2D subframes of the D2D communication resource and receives the D2D on the latter D2D subframe in the M minimum change period. The data sent by terminal B;

After receiving the indication signaling of the resource configuration, the D2D terminal B receives the data sent by the D2D terminal A on the first two D2D subframes of the D2D communication resource in the M minimum change period, and sends the data to the D2D terminal A on the latter D2D subframe. send data;

Step 4: 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 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 (such as three D2D subframes in FIG. 7), and re-determines according to the received resource occupation request. The resource location of the transmission resource of each D2D terminal in the D2D communication group, for example, the base station in FIG. 7 determines the previous D2D subframe included in the D2D communication resource as the transmission resource of the D2D terminal A, and the latter two D2D subframes are determined as the D2D. The receiving resource of the terminal A determines the previous D2D subframe included in the D2D communication resource as the receiving resource of the D2D terminal B, and the last two D2D subframes are determined as the sending resource of the D2D terminal B;

The base station notifies the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal in the re-determined D2D communication group. For example, the base station in FIG. 7 uses the resource configuration indication signaling to include the previous D2D sub-component of the D2D communication resource. The frame is a transmission resource, the latter two D2D subframes are used to receive the indication information of the received resource, and are sent to the D2D terminal A, and the previous D2D subframe included in the D2D communication resource is the received resource, and the latter two D2D subframes are the indication information of the sending resource. Send to D2D terminal B; Step 6: After receiving the resource configuration indication signaling again, the D2D terminal A sends data to the D2D terminal B on the previous D2D subframe of the D2D communication resource in the N minimum change periods starting from the M+1 minimum change period. 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 receives the data sent by the D2D terminal A in the previous D2D subframe of the D2D communication resource from the N minimum change periods starting from the M+1 minimum change period, Data is transmitted to the D2D terminal A on the last two D2D subframes.

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

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

a location determining unit 82, configured to determine, according to the received resource occupation request, a resource location of a transmission resource of each D2D terminal in the D2D communication group, where a transmission resource of each D2D terminal is located in the D2D communication resource; Transmission resources include transmitting resources and/or receiving resources;

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 instruct the corresponding D2D terminal to perform data transmission on the notified transmission resource.

Further, the resource determining unit 81 is configured to:

Further, the resource occupation request sent by each D2D terminal received by the resource determining unit 81 includes: the D2D terminal sends the dedicated scheduling request for the D2D link configured by the D2D terminal on the SR resource.

SR, the SR is used to indicate that the D2D terminal needs to transmit data on the D2D link; and/or,

Further, the location determining unit 82 is configured to:

The location notification unit 83 is used to:

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 notification 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.

Further, each of the minimum indication periods includes M subframes, where the M subframes include M1 D2D sub-frames. a frame, where M is an integer greater than 1, and Ml is an integer not less than one.

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:

The parameter determining unit 84 is 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

Further, the location determining unit 82 is configured to:

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

Further, the location notification unit 83 is configured to:

A base station, the base station comprising:

a processor, the processor is configured to: after each 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; according to the received resource occupation Determining, 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 radio unit is configured to: transmit transmission resources of each D2D terminal in the D2D communication group The resource location is notified to the corresponding D2D terminal to instruct the corresponding D2D terminal to perform data transmission on the notified transmission resource.

Referring to FIG. 9, the embodiment of the present application provides a D2D terminal, where the D2D terminal includes:

a location notification receiving unit 90, configured to receive a notification of a resource location of a transmission resource of the D2D terminal sent by the network side device; the D2D terminal is a D2D terminal in the D2D communication group, and the notification is that the network side device receives the location After 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 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;

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:

The request sending unit 92 is 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:

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 used to:

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, the D2D terminal further includes:

The parameter determining unit 93 is configured to pre-agreed with the network side device a minimum change period, a minimum indication period, and at least two values of L; or

Further, the notification received by the location notification receiving unit 90 further includes information about a transmission scheme used by the D2D terminal to perform data transmission; The data transmission unit 91 is used to:

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: perform data transmission on the newly notified transmission resource from a subsequent minimum change period.

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

A D2D terminal, the D2D terminal includes:

In summary, the beneficial effects of the application include:

In the solution provided by the embodiment of the present application, 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, according to the received resource. The occupancy request determines 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, and the D2D terminal receives the network side device to send After the notification of the resource location of the transmission resource of the D2D terminal, 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 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. The resource competition problem of multiple D2D terminals in each D2D subframe.

The present application is a flowchart of a method, device (system), and computer program product according to an embodiment of the present application. And / or block diagram to describe. 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 processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

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

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although the preferred embodiment of the present application has been described, those skilled in the art can make additional changes and modifications to the embodiments once they are aware of the basic inventive concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

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

Claims

Rights request

1. A data transmission method in device-to-device D2D communication, characterized in that the method includes: the network side device determines the resource occupation request sent by at least one D2D terminal in the same D2D communication group each time. The D2D communication resources corresponding to the D2D communication group determine the resource location of the transmission resources of each D2D terminal in the D2D communication group according to the received resource occupation request, wherein the transmission resources of each D2D terminal are located in the D2D communication resources. ; The transmission resources include sending resources and/or receiving resources;

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 instruct the corresponding D2D terminal to perform data transmission on the notified transmission resource.

2. The method of claim 1, wherein the network side device determines the D2D communication resources corresponding to the D2D communication group, specifically including:

The network side device determines the communication resources pre-allocated to the D2D communication group as the D2D communication resources corresponding to the D2D communication group; or,

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

3. The method of claim 1, wherein the resource occupation request sent by the D2D terminal includes: a dedicated scheduling request SR resource for the D2D link that the D2D terminal has configured for itself on the network side.

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 BSR is used to indicate the amount of data that the D2D terminal currently needs to transmit on the D2D link.

4. The method of claim 1, wherein determining the resource location of the transmission resources of each D2D terminal in the D2D communication group based on the received resource occupation request specifically includes:

According to the received resource occupation request, determine the resource location of the transmission resources of each D2D terminal in the D2D communication group in the minimum indication period;

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 instruct the corresponding D2D terminal to perform data transmission on the notified transmission resource, which specifically includes: Network side The device notifies the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal in the D2D communication group in the minimum indication period, so as to instruct the corresponding D2D terminal to use the notification indication in at least one subsequent minimum change period. Data transmission is performed on the transmission resources; each minimum change period includes L minimum indication periods, and L is an integer not less than 1.

5. The method of claim 4, wherein each minimum indication period includes M subframes, and the M subframes include M1 D2D subframes, where M is an integer greater than 1, and M1 is not An integer less than 1.

6. The method of claim 4, further comprising:

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

The network side device notifies each D2D terminal in advance of the minimum change period, the minimum indication period, and the values of at least two parameters in L; or,

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

7. The method according to claim 4, characterized in that, 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 is determined, specifically include:

For each D2D terminal in the D2D communication group, select a pattern from the preset patterns of multiple transmission resources corresponding to the D2D terminal according to the received resource occupation request, and determine the D2D terminal according to the pattern. The resource location of the transmission resource, where the pattern of each transmission resource is the pattern of the D2D subframe within a minimum indication period as the sending resource or receiving resource.

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

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

The network side device notifies the corresponding D2D terminal of the information on the transmission scheme adopted by each D2D terminal in the D2D communication group for data transmission.

10. The method according to any one of claims 1 to 9, characterized in that, 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, specifically include:

The network side device sends an indication signaling to each D2D terminal in the D2D communication group, and each indication signaling carries information on the resource location of the transmission resource corresponding to the D2D terminal; or,

The network side device sends an instruction signaling to each D2D terminal in the D2D communication group, and the instruction signaling carries information about the resource location of the transmission resource of each D2D terminal.

11. A data transmission method in device-to-device D2D communication, characterized in that the method includes:

The D2D terminal receives a 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 received by the network side device in the D2D communication group. After at least one D2D terminal sends a resource occupancy request, a notification of the resource location of the transmission resource of the D2D terminal is determined in the D2D communication resource corresponding to the D2D communication group according to the received resource occupancy request; Transmission resources include sending resources and/or receiving resources;

The D2D terminal performs data transmission on the transmission resources of the D2D terminal according to the notification.

12. The method according to claim 11, characterized in that, before the D2D terminal receives the notification, further comprising:

13. The method of claim 12, wherein the resource occupation request includes:

The D2D terminal sends the SR on the dedicated scheduling request SR resource configured for itself on the network side for the D2D link. The SR is used to indicate that the D2D terminal needs to transmit data on the D2D link; and/or,

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

The D2D terminal performs data transmission on the transmission resources of the D2D terminal according to the notification, which specifically includes: The D2D terminal performs data transmission on the transmission resources indicated by the notification for at least one subsequent minimum change period; wherein each The minimum change period includes L minimum indication periods, and L is an integer not less than 1.

15. The method of claim 14, wherein each minimum indication period includes M subframes, and the M subframes include M1 D2D subframes, where M is an integer greater than 1, and M1 is not An integer less than 1.

16. The method of claim 14, further comprising:

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

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

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

17. The method of claim 11, wherein the notification also includes information on the transmission scheme used by the D2D terminal for data transmission;

The D2D terminal performs data transmission on the transmission resources of the D2D terminal according to the notification, which specifically includes: the D2D terminal uses the notified transmission scheme to perform data transmission on the transmission resources of the D2D terminal.

18. The method according to any one of claims 14-16, characterized in that, after the D2D terminal receives the notification, further comprising:

The D2D terminal receives the notification of the resource location of the transmission resource of the D2D terminal again from the network side device; the D2D terminal starts data transmission on the latest notified transmission resource starting from the subsequent minimum change period.

19. The method according to any one of claims 11 to 17, characterized in that: the D2D terminal receives network side equipment The notification of the resource location of the transmission resource of the D2D terminal sent by the device, specifically includes:

The D2D terminal receives the instruction signaling sent by the network side device for the D2D terminal, and the instruction signaling carries the resource location information of the transmission resource of the D2D terminal; or,

The D2D terminal receives the instruction signaling sent by the network side device for each D2D terminal in the D2D communication group, where the instruction signaling carries information about the resource location of the transmission resource of each _D2D terminal.

20. A base station, characterized in that the base station includes:

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

a location determination unit, configured to determine the resource location of the transmission resources of each D2D terminal in the D2D communication group according to the received resource occupation request, where the transmission resources of each D2D terminal are located in the D2D communication resources; the transmission Resources include sending resources and/or receiving resources;

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

21. The base station according to claim 20, characterized in that the resource determination unit is used to:

Determine the communication resources pre-allocated to the D2D communication group as the D2D communication resources corresponding to the D2D communication group; or,

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

22. The base station according to claim 20, wherein the resource occupation request sent by the D2D terminal received by the resource determination unit includes:

23. The base station according to claim 20, characterized in that the position determining unit is used for:

The location notification unit is used for:

Notify the corresponding D2D terminal of the resource location of the transmission resource of each D2D terminal in the D2D communication group in the minimum indication period, so as to instruct the corresponding D2D terminal to use the transmission resource location indicated in the notification in at least one subsequent minimum change period. Data transmission is performed on the transmission resource; each minimum change period includes L minimum indication periods, and L is an integer not less than 1.

24. The base station according to claim 23, characterized in that each minimum indication period includes M subframes, The M subframes include Ml D2D subframes, where M is an integer greater than 1, and Ml is an integer not less than 1.

25. The base station according to claim 23, characterized in that, the base station further includes:

The parameter determination unit is used to agree in advance with each D2D terminal on the minimum change period, the minimum instruction period, and the values of at least two parameters in L; or,

Notify each D2D terminal in advance of the minimum change period, the minimum instruction period, and the values of at least two parameters in L; or,

The minimum change period, the minimum instruction period, and the value of one parameter in L are agreed in advance with each D2D terminal, and the value of at least one remaining parameter is notified to each D2D terminal in advance.

26. The base station according to claim 23, characterized in that the position determining unit is used for:

27. The base station according to claim 20, characterized in that the position determining unit is used for:

When determining the resource location of the transmission resource of each D2D terminal, determine the location of the fixed resource for the D2D terminal to transmit or receive data according to the preset rules, and determine the location of the fixed resource for the D2D terminal to perform data transmission according to the received resource occupation request. The location of non-fixed resources where data is sent or received.

28. The base station according to claim 20, wherein the location notification unit is further configured to: when notifying the resource location of the transmission resources of each D2D terminal in the D2D communication group to the corresponding D2D terminal, Notify the corresponding D2D terminal of the information of the transmission scheme adopted by each D2D terminal in the D2D communication group when transmitting data.

29. The base station according to any one of claims 20 to 28, wherein the location notification unit is configured to: send an indication signaling to each D2D terminal in the D2D communication group, each indication The signaling carries information about the resource location of the transmission resource corresponding to the D2D terminal; or,

Send 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.

30. A D2D terminal, characterized in that the D2D terminal includes:

A location notification receiving unit is configured to receive a 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 when the network side device receives the After at least one D2D terminal in the D2D communication group sends a resource occupancy request, notify the resource location of the transmission resource of the D2D terminal determined in the D2D communication resources corresponding to the D2D communication group according to the received resource occupancy request; so The transmission resources include sending resources and/or receiving resources;

A data transmission unit, configured to transmit data on the transmission resources of the D2D terminal according to the notification.

31. The D2D terminal according to claim 30, characterized in that the D2D terminal further includes:

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

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

33. The D2D terminal according to claim 30, wherein the notification received by the location notification receiving unit is the resource of the last transmission resource in the minimum indication period received by the D2D terminal in the current minimum change period. Notification of location;

The data transmission unit is used for:

For at least one subsequent 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 1.

34. The D2D terminal of claim 33, wherein each minimum indication period 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.

35. The D2D terminal according to claim 33, characterized in that, the D2D terminal further includes:

The parameter determination unit is used to pre-agree with the network side device on the minimum change period, the minimum indication period, and the values of at least two parameters in L; or,

Receive the minimum change period, the minimum indication period, and the values of at least two parameters in L sent in advance by the network side device; or,

The minimum change period, the minimum indication period, and the value of one parameter in L are agreed in advance with the network side device, and the value of at least one remaining parameter sent in advance by the network side device is received.

36. The D2D terminal according to claim 30, wherein the notification received by the location notification receiving unit also includes information on the transmission scheme used by the D2D terminal for data transmission;

The data transmission unit is used for:

Using the notified transmission scheme, data is transmitted on the transmission resources of the D2D terminal.

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

The data transmission unit is also used to: perform data transmission on the latest notified transmission resources starting from the subsequent minimum change period.

38. The D2D terminal according to any one of claims 30 to 36, characterized in that: the location notification receiving unit Used for:

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

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