CN107548070B - Data transmission method, device and system - Google Patents

Abstract

The invention provides a data transmission method, a device and a system, wherein the method comprises the following steps: receiving a data transmission request reported by one or more source devices, wherein the data transmission request is used for requesting a base station to transmit device-to-device (D2D) data between the source device and a destination device; respectively distributing unlicensed frequency band resources to one or more source devices according to the data transmission request to obtain a distribution result of the unlicensed frequency band resources; and issuing an allocation result, wherein the source device and/or the destination device transmits the D2D data on the unlicensed frequency band according to the allocation result, so that the problem that the D2D data cannot be transmitted on the unlicensed frequency band in the related art is solved, and the transmission of the D2D data on the unlicensed frequency band is realized.

Description

Data transmission method, device and system

Technical field

The present invention relates to the field of communications, and specifically, to a data transmission method, device and system.

Background technique

In the cellular mobile communication system centered on the base station, the system still has problems in coverage and capacity. A large number of studies have shown that device-to-device (D2D) communication has unique advantages in saving resources, reducing interference, and improving transmission efficiency. In the D2D communication method, users directly interact with each other without going through the base station. The base station only needs to control device communication macroscopically. In view of this, combining D2D technology with the LTE system can greatly reduce the communication load of the base station, expand the coverage of the cell, and improve the service quality of cell edge users, thereby increasing the total throughput of the cell.

With the in-depth research on D2D-LTE technology, resource allocation methods for LTE/LTE-A cellular communication systems and D2D communication technology are also emerging one after another. However, the current resource allocation methods of D2D communication technology are all carried out in licensed frequency bands. However, with the widespread deployment of fourth-generation mobile communication systems around the world, LTE spectrum utilization has gradually reached a bottleneck. Further improving the utilization of licensed spectrum requires fundamental technological innovation or a complete upgrade of hardware equipment, which is too costly.

There is currently no effective solution to the problem in related technologies that D2D data cannot be transmitted in unlicensed frequency bands.

Contents of the invention

Embodiments of the present invention provide a data transmission method, device and system to at least solve the problem in related technologies that D2D data cannot be transmitted in unlicensed frequency bands.

According to an embodiment of the present invention, a data transmission method is provided, including: receiving data transmission requests reported by one or more source devices, wherein the data transmission requests are used to request a base station to transmit between the source device and the destination device. device-to-device D2D data between devices; allocate unlicensed frequency band resources to the one or more source devices according to the data transmission request, and obtain the allocation result of the unlicensed frequency band resources; issue the allocation result, wherein, The source device and/or the destination device transmits the D2D data on the unlicensed frequency band according to the allocation result.

Optionally, delivering the allocation result includes: delivering the allocation result to the one or more source devices and destination devices corresponding to the one or more source devices; or delivering the allocation result to the one or more source devices. Describe one or more source devices.

Optionally, in the case where the allocation result is delivered to the one or more source devices and the destination device corresponding to the one or more source devices, the allocation result includes: non-allocated data allocated to each source device. The resource block identifier of the licensed frequency band resource block and the first control information used to control data transmitted on the unlicensed frequency band resource block, wherein the resource block identifier is used to uniquely identify the unlicensed frequency band resource block ; In the case where the allocation result is delivered to the one or more source devices, the allocation result includes: the resource block identifier of the unlicensed frequency band resource block allocated to each source device, wherein the resource block identifier Used to uniquely identify the unlicensed frequency band resource block.

Optionally, the time slots of the communication frames on the unlicensed frequency band include at least one of the following: dedicated time slots, backup time slots, and shared time slots.

Optionally, allocating unlicensed frequency band resources to the one or more source devices according to the data transmission request includes: controlling the transmission of the D2D data according to the second control carried in the data transmission request. The information determines a proportion of resources allocated to each source device, wherein the resources include at least one of the following: dedicated time slot resources, backup time slot resources, shared time slot resources; according to the determined proportion of the resources and each The second control information carried in the data transmission request allocates resource blocks on the dedicated time slot and/or the spare time slot for each source device.

Optionally, before issuing the allocation result, the method further includes: performing a first clear channel assessment CCA test on the unlicensed frequency band; if the first CCA test is successful, confirm that the unlicensed frequency band is occupied. Licensed frequency band.

According to another embodiment of the present invention, a data transmission method is provided, including: sending a data transmission request to a base station, wherein the data transmission request is used to request transmission of device-to-device D2D data between a source device and a destination device. ; Receive the allocation result of unlicensed frequency band resources issued by the base station; send the D2D data to the destination device on the unlicensed frequency band according to the allocation result.

Optionally, the allocation result includes: a resource block identifier of an unlicensed frequency band resource block allocated for transmitting the D2D data and first control information used to control data transmitted on the unlicensed frequency band resource block. , wherein the resource block identifier is used to uniquely identify the unlicensed frequency band resource block; or the allocation result includes: the resource block identifier of the unlicensed frequency band resource block allocated to the source device, wherein the resource block The identifier is used to uniquely identify the unlicensed frequency band resource block.

Optionally, when the allocation result includes: the resource block identifier and the first control information, sending the D2D data on the unlicensed frequency band according to the allocation result includes: in the resource The D2D data is sent on the unlicensed frequency band resource corresponding to the block identifier according to the instruction of the first control information.

Optionally, when the allocation result includes: the resource block identifier, sending the D2D data on the unlicensed frequency band according to the allocation result includes: sending the D2D data on the unlicensed frequency band corresponding to the resource block identifier. Third control information used to control the transmission of the D2D data on the unlicensed frequency band and the D2D data are sent on the resource.

Optionally, the time slots of the communication frames on the unlicensed frequency band include at least one of the following: dedicated time slots, backup time slots, and shared time slots; the allocation results include: the time slots allocated for transmitting the D2D data. Resource block identifiers on dedicated time slots and/or resource block identifiers on the spare time slots allocated for transmitting the D2D data.

Optionally, sending the D2D data on the unlicensed frequency band according to the allocation result includes: assigning the dedicated time slot to the dedicated time slot on the dedicated time slot resource block corresponding to the resource block identifier on the allocated dedicated time slot. The resource block performs the second CCA detection; if the second CCA detection is successful, the D2D data is sent on the dedicated time slot resource block.

Optionally, after performing the second CCA detection on the dedicated time slot resource block on the dedicated time slot resource block corresponding to the allocated resource block identifier on the dedicated time slot, the method further includes: If the second CCA fails to detect, perform a third CCA with a preset priority on the spare time slot resource block corresponding to the resource block identifier on the allocated spare time slot. Detection; if the third CCA detection fails, re-perform the third CCA detection of the preset priority on the spare time slot resource block after waiting for a preset time period; or, after the third CCA If the detection is successful, the source device transmits the D2D data on the spare time slot resource block.

Optionally, the preset priority is higher than the priority of CCA detection on the base station side, and/or the preset priority is the highest priority on the device side.

Optionally, after performing a third CCA detection of a preset priority on the spare time slot resource block corresponding to the allocated resource block identifier on the spare time slot, the method further includes : When the source device has not completed the transmission of the D2D data on the spare time slot resource block, complete the transmission of the D2D data on the shared time slot.

According to another embodiment of the present invention, a data transmission method is provided, including: receiving an allocation result of unlicensed frequency band resources issued by a base station or controlling the transmission of device-to-device D2D data on the unlicensed frequency band. Third control information: receive the D2D data on the unlicensed frequency band according to the allocation result or the third control information.

Optionally, receiving the D2D data on an unlicensed frequency band according to the allocation result includes: detecting and receiving the D2D data on an unlicensed frequency band resource block indicated by the allocation result.

Optionally, receiving the D2D data on the unlicensed frequency band according to the third control information includes: judging whether to receive the D2D data according to the third control information; when it is judged that the D2D data is received, The D2D data is detected and received on the unlicensed frequency band resource block indicated by the third control information.

According to another embodiment of the present invention, a data transmission device is provided, including: a first receiving module, configured to receive data transmission requests reported by one or more source devices, wherein the data transmission requests are used to report to a base station Requesting the transmission of device-to-device D2D data between the source device and the destination device; an allocation module configured to allocate unlicensed frequency band resources to the one or more source devices according to the data transmission request to obtain the unlicensed frequency band resources Allocation result; a delivery module, configured to deliver the allocation result, wherein the source device and/or the destination device transmits the D2D data on the unlicensed frequency band according to the allocation result.

Optionally, the delivery module is configured to: deliver the allocation result to the one or more source devices and destination devices corresponding to the one or more source devices; or, deliver the allocation result to The one or more source devices.

Optionally, in the case where the delivery module is used to deliver the allocation result to the one or more source devices and the destination device corresponding to the one or more source devices, the allocation result includes: Each source device is assigned a resource block identifier of an unlicensed frequency band resource block and first control information used to control data transmitted on the unlicensed frequency band resource block, where the resource block identifier is used to uniquely identify The unlicensed frequency band resource block; when the delivery module is used to deliver the allocation result to the one or more source devices, the allocation result includes: allocating an unlicensed frequency band to each source device Resource block identifier of the resource block, wherein the resource block identifier is used to uniquely identify the unlicensed frequency band resource block.

According to another embodiment of the present invention, a data transmission device is provided, including: a first sending module configured to send a data transmission request to a base station, wherein the data transmission request is used to request transmission between a source device and a destination device. device-to-device D2D data between devices; a second receiving module, configured to receive the allocation result of unlicensed frequency band resources issued by the base station; a second sending module, configured to send the allocation result to the unlicensed frequency band according to the allocation result. The destination device sends the D2D data.

Optionally, the allocation result includes: a resource block identifier of an unlicensed frequency band resource block allocated for transmitting the D2D data and first control information used to control data transmitted on the unlicensed frequency band resource block. , wherein the resource block identifier is used to uniquely identify the unlicensed frequency band resource block; or the allocation result includes: the resource block identifier of the unlicensed frequency band resource block allocated to the source device, wherein the resource The block identifier is used to uniquely identify the unlicensed frequency band resource block.

Optionally, the second sending module is configured to: when the allocation result includes: the resource block identifier and the first control information, on the unlicensed frequency band resource corresponding to the resource block identifier according to The instruction of the first control information is to send the D2D data.

Optionally, the second sending module is configured to: when the allocation result includes the resource block identifier, send the D2D data on the unlicensed frequency band resource corresponding to the resource block identifier. The third control information and the D2D data for controlling transmission on the unlicensed frequency band.

According to another embodiment of the present invention, a data transmission device is provided, including: a third receiving module, configured to receive an allocation result of unlicensed frequency band resources issued by a base station or to transmit device-to-device D2D data in an unlicensed third control information for controlling transmission on the frequency band; a fourth receiving module configured to receive the D2D data on the unlicensed frequency band according to the allocation result or the third control information.

Optionally, the fourth receiving module is configured to detect and receive the D2D data on the unlicensed frequency band resource block indicated by the allocation result.

Optionally, the fourth receiving module is configured to: determine whether to receive the D2D data according to the third control information; if it is determined that the D2D data is received, when the third control information indicates that the D2D data is not received, The D2D data is detected and received on the authorized frequency band resource block.

According to another embodiment of the present invention, a data transmission system is provided, including: a base station, a source device and a destination device, wherein the base station is configured to receive data transmission requests reported by one or more source devices, Wherein, the data transmission request is used to request the base station to transmit device-to-device D2D data between the source device and the destination device; allocate unlicensed frequency band resources to the one or more source devices according to the data transmission request, and obtain The allocation result of the unlicensed frequency band resources; delivering the allocation result, wherein the source device and/or the destination device transmits the D2D data on the unlicensed frequency band according to the allocation result; the source device , configured to send the data transmission request to the base station; receive the allocation result of the unlicensed frequency band resources issued by the base station; send the D2D data to the destination device on the unlicensed frequency band according to the allocation result; The destination device is configured to receive the allocation result of unlicensed frequency band resources issued by the base station or the third control information used to control the transmission of the D2D data in the unlicensed frequency band; according to the allocation result or The third control information receives the D2D data on an unlicensed frequency band.

Optionally, the base station is configured to: deliver the allocation result to the one or more source devices and destination devices corresponding to the one or more source devices; or, deliver the allocation result to the One or more source devices.

Optionally, in the case where the base station is used to deliver the allocation result to the one or more source devices and the destination device corresponding to the one or more source devices, the allocation result includes: for each A source device allocates a resource block identifier of an unlicensed frequency band resource block and first control information used to control data transmitted on the unlicensed frequency band resource block, where the resource block identifier is used to uniquely identify the Unlicensed frequency band resource blocks; in the case where the base station is used to deliver the allocation result to the one or more source devices, the allocation result includes: allocating resources of the unlicensed frequency band resource block to each source device. Block identifier, wherein the resource block identifier is used to uniquely identify the unlicensed frequency band resource block.

Optionally, the source device is configured to: when the allocation result includes: the resource block identifier and the first control information, on the unlicensed frequency band resource corresponding to the resource block identifier according to the The first control information indicates sending the D2D data.

Optionally, the source device is configured to: when the allocation result includes: the resource block identifier, send on the unlicensed frequency band resource corresponding to the resource block identifier a method for assigning the D2D data to the location of the resource block identifier. third control information and the D2D data for controlling transmission on the unlicensed frequency band.

Optionally, the destination device is configured to detect and receive the D2D data on the unlicensed frequency band resource block indicated by the allocation result.

Optionally, the destination device is configured to: determine whether to receive the D2D data according to the third control information; if it is determined that the D2D data is received, in the unlicensed frequency band indicated by the third control information Detect and receive the D2D data on the resource block.

Through the present invention, data transmission requests reported by one or more source devices are received, wherein the data transmission requests are used to request the base station to transmit device-to-device D2D data between the source device and the destination device; according to the data transmission requests, one or Multiple source devices allocate unlicensed frequency band resources and obtain the allocation results of the unlicensed frequency band resources; the allocation results are issued, in which the source device and/or the destination device transmits D2D data on the unlicensed frequency band according to the allocation results. It can be seen that, using The above solution uses the base station to allocate resources in the unlicensed frequency band for D2D data between the source device and the destination device, and issues the resources for the source device and/or the destination device to transmit on the unlicensed frequency band according to the allocation result. The distribution result of the D2D data is described above. Therefore, the transmission of the D2D data in the unlicensed frequency band is realized, thereby solving the problem in the related technology that the D2D data cannot be transmitted in the unlicensed frequency band.

Description of the drawings

The drawings described here are used to provide a further understanding of the present invention and constitute a part of this application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the attached picture:

Figure 1 is a flow chart of a data transmission method according to an embodiment of the present invention;

Figure 2 is a flow chart of another data transmission method according to an embodiment of the present invention;

Figure 3 is a flow chart of yet another data transmission method according to an embodiment of the present invention;

Figure 4 is a structural block diagram of a data transmission device according to an embodiment of the present invention;

Figure 5 is a structural block diagram of another data transmission device according to an embodiment of the present invention;

Figure 6 is a structural block diagram of another data transmission device according to an embodiment of the present invention;

Figure 7 is a schematic diagram of instructions for a UE to transmit control information according to an optional embodiment of the present invention;

Figure 8 is a schematic diagram of resource allocation by a base station according to an optional embodiment of the present invention;

Figure 9 is a schematic diagram of a DCI format according to an optional embodiment of the present invention;

Figure 10 is a flow chart of data transmission by a UE according to an optional embodiment of the present invention;

Figure 11 is a flow chart of data transmission by another UE according to an optional embodiment of the present invention.

Detailed ways

The present invention will be described in detail below with reference to the accompanying drawings and embodiments. It should be noted that, as long as there is no conflict, the embodiments and features in the embodiments of this application can be combined with each other.

It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

Example 1

This embodiment provides a data transmission method. Figure 1 is a flow chart of a data transmission method according to an embodiment of the present invention. As shown in Figure 1, the process includes the following steps:

Step S102: Receive data transmission requests reported by one or more source devices, where the data transmission requests are used to request the base station to transmit device-to-device D2D data between the source device and the destination device;

Step S104: Allocate unlicensed frequency band resources to one or more source devices according to the data transmission request, and obtain the allocation result of the unlicensed frequency band resources;

Step S106: Send the allocation result, where the source device and/or the destination device transmit D2D data on the unlicensed frequency band according to the allocation result.

Optionally, the above data transmission method may be, but is not limited to, applied in D2D data transmission scenarios. For example: a scenario in which resources are allocated for D2D data transmission devices and D2D data transmission is performed.

Optionally, the above data transmission method can be applied to, but is not limited to, base stations, such as macro base stations, micro base stations, pico base stations, home base stations, etc.

Through the above steps, receive data transmission requests reported by one or more source devices, where the data transmission requests are used to request the base station to transmit device-to-device D2D data between the source device and the destination device; according to the data transmission requests, one or more Multiple source devices allocate unlicensed frequency band resources and obtain the allocation results of the unlicensed frequency band resources; the allocation results are issued, in which the source device and/or the destination device transmits D2D data on the unlicensed frequency band according to the allocation results. It can be seen that, using The above solution uses the base station to allocate resources in the unlicensed frequency band for D2D data between the source device and the destination device, and issues the allocation result for the source device and/or the destination device to transmit D2D data on the unlicensed frequency band according to the allocation result. Therefore , realizes the transmission of D2D data on unlicensed frequency bands, thus solving the problem in related technologies that D2D data cannot be transmitted on unlicensed frequency bands.

Optionally, the allocation result delivered by the base station can be sent to both the source device and the destination device, or can be sent only to the source device. For example: deliver the allocation results to one or more source devices and one or more destination devices corresponding to the source devices; or deliver the allocation results to one or more source devices.

Optionally, when the allocation results are delivered to one or more source devices and one or more destination devices corresponding to the source devices, the allocation results may include, but are not limited to: unlicensed frequency band resource blocks allocated to each source device. The resource block identifier and the first control information used to control the data transmitted on the unlicensed frequency band resource block, where the resource block identifier is used to uniquely identify the unlicensed frequency band resource block; before sending the allocation result to one or more In the case of a source device, the allocation result may, but is not limited to, include: a resource block identifier of the unlicensed frequency band resource block allocated to each source device, where the resource block identifier is used to uniquely identify the unlicensed frequency band resource block.

Optionally, time slots of communication frames on the unlicensed frequency band may be segmented according to different usage patterns. For example: the time slots of communication frames on the unlicensed frequency band include at least one of the following: dedicated time slots, backup time slots, and shared time slots. The dedicated time slot may be a time slot resource used by a designated device, and the dedicated time slot is specifically used to transmit data of the designated device. The spare time slot can be pre-allocated to a designated device. In addition to transmitting data of the designated device, the spare time slot can also transmit data of other devices.

Optionally, in order to complete the transmission of data on a dedicated time slot as much as possible, the second control information for controlling the transmission of D2D data carried in the data transmission request may be used. For example, the second control information may be but is not limited to Including the amount and type of data to be transmitted, the proportion of resources available to the device is allocated to the three time slots, and then the resources are allocated according to the allocated proportion. For example: determine the proportion of resources allocated to each source device according to the second control information carried in the data transmission request for controlling the transmission of D2D data, where the resources include at least one of the following: dedicated time slot resources, backup Time slot resources, shared time slot resources, and resource blocks on dedicated time slots and/or spare time slots are allocated to each source device according to the determined ratio of resources and the second control information carried in each data transmission request.

Optionally, in order to ensure the availability of resources, before the above step S106, CCA detection can be performed on the channel but is not limited to it. If the detection is successful, the unlicensed frequency band will be occupied. For example: perform the first free channel assessment CCA detection on the unlicensed frequency band, and if the first CCA detection is successful, it is confirmed that the unlicensed frequency band is occupied.

This embodiment also provides another data transmission method. Figure 2 is a flow chart of another data transmission method according to the embodiment of the present invention. As shown in Figure 2, the process includes the following steps:

Step S202: Send a data transmission request to the base station, where the data transmission request is used to request the transmission of device-to-device D2D data between the source device and the destination device;

Step S204: Receive the allocation result of unlicensed frequency band resources issued by the base station;

Step S206: Send D2D data to the destination device on the unlicensed frequency band according to the allocation result.

Optionally, the above data transmission method may be, but is not limited to, applied in D2D data transmission scenarios. For example: a scenario in which resources are allocated for D2D data transmission devices and D2D data transmission is performed.

Optionally, the above data transmission method may be, but is not limited to, applied to a device that transmits D2D data, such as a source device that transmits D2D data.

Through the above steps, send a data transmission request to the base station, where the data transmission request is used to request the transmission of device-to-device D2D data between the source device and the destination device; receive the allocation result of the unlicensed frequency band resources issued by the base station; according to the allocation result D2D data is sent to the destination device on the unlicensed frequency band. It can be seen that the above solution is used to transmit D2D data according to the allocation result of the resources of the unlicensed frequency band allocated by the base station for D2D data between the source device and the destination device. Therefore, it is achieved The transmission of D2D data on unlicensed frequency bands solves the problem in related technologies that D2D data cannot be transmitted on unlicensed frequency bands.

Optionally, the allocation result may, but is not limited to, include: a resource block identifier of an unlicensed frequency band resource block allocated for transmitting D2D data and first control information used to control data transmitted on the unlicensed frequency band resource block, where , the resource block identifier is used to uniquely identify the unlicensed frequency band resource block; or the allocation result may, but is not limited to, include: the resource block identifier of the unlicensed frequency band resource block allocated to the source device, where the resource block identifier is used to uniquely identify the unlicensed frequency band. Resource blocks.

Optionally, in the case where the allocation result includes: the resource block identifier and the first control information, in the above step S206, the D2D data is sent on the unlicensed frequency band resource corresponding to the resource block identifier according to the instruction of the first control information.

Optionally, in the case where the allocation result includes: a resource block identifier, in the above step S206, a third message for controlling the transmission of D2D data on the unlicensed frequency band is sent on the unlicensed frequency band resource corresponding to the resource block identifier. Three control information and D2D data.

Optionally, the time slots of communication frames on the unlicensed frequency band may, but are not limited to, include at least one of the following: dedicated time slots, backup time slots, and shared time slots; the allocation results may include, but are not limited to: allocated for transmitting D2D data. Resource block identifiers on dedicated time slots and/or resource block identifiers on spare time slots allocated for transmitting D2D data.

Optionally, in the above step S206, the second CCA detection may be performed on the unlicensed frequency band before transmitting data. For example: perform the second CCA detection on the dedicated time slot resource block on the dedicated time slot resource block corresponding to the resource block identifier on the allocated dedicated time slot. If the second CCA detection is successful, perform the second CCA detection on the dedicated time slot resource block on the dedicated time slot resource block. Send D2D data.

Optionally, after performing the second CCA detection on the dedicated time slot resource block on the dedicated time slot resource block corresponding to the resource block identifier on the allocated dedicated time slot, if the second CCA detection fails, the allocated spare time slot can be Perform a third CCA test with a preset priority on the backup time slot resource block corresponding to the resource block identifier on The resource block re-detects the third CCA with a preset priority; or, if the third CCA detection is successful, the source device transmits D2D data on the spare time slot resource block.

Optionally, the preset priority may be, but is not limited to, higher than the priority of CCA detection on the base station side, and/or, the preset priority may be, but is not limited to, the highest priority on the device side.

Optionally, the D2D device that has not completed transmission in the dedicated time slot needs to perform CCA detection first when transmitting data in the backup time slot. The CCA detection at this time has a higher priority than the CCA performed in the dedicated time slot. D2D devices that have not completed transmission in the spare time slot need to perform CCA detection first when transmitting data in the shared time slot. The CCA detection at this time has a higher priority than the CCA performed in the spare time slot.

Optionally, after performing the third CCA detection of the preset priority on the spare time slot resource block corresponding to the resource block identifier on the allocated spare time slot, if the source device is in the spare time slot resource block The transmission of D2D data is not completed on the shared time slot, and the transmission of D2D data can be completed on the shared time slot.

This embodiment also provides yet another data transmission method. Figure 3 is a flow chart of yet another data transmission method according to the embodiment of the present invention. As shown in Figure 3, the process includes the following steps:

Step S302: Receive the allocation result of the unlicensed frequency band resources issued by the base station or the third control information used to control the transmission of device-to-device D2D data on the unlicensed frequency band;

Step S304: Receive D2D data on the unlicensed frequency band according to the allocation result or the third control information.

Optionally, the above data transmission method may be, but is not limited to, applied in D2D data transmission scenarios. For example: a scenario in which resources are allocated for D2D data transmission devices and D2D data transmission is performed.

Optionally, the above data transmission method may be, but is not limited to, applied to a device that transmits D2D data, such as a destination device that transmits D2D data.

Through the above steps, the allocation result of the unlicensed frequency band resources issued by the base station or the third control information used to control the transmission of device-to-device D2D data on the unlicensed frequency band is received; according to the allocation result or the third control information, the unlicensed frequency band resource allocation result is received. D2D data is received on the licensed frequency band. It can be seen that the above solution is used according to the allocation result of the resources of the unlicensed frequency band allocated by the base station for D2D data between the source device and the destination device or the received D2D data between the device and the device. The third control information that controls transmission on the unlicensed frequency band receives D2D data on the unlicensed frequency band. Therefore, the transmission of D2D data on the unlicensed frequency band is realized, thereby solving the problem in related technologies that D2D data cannot be transmitted on the unlicensed frequency band. The problem.

Optionally, in the above step S304, if the allocation result is received, the D2D data may be detected and received on the unlicensed frequency band resource block indicated by the allocation result.

Optionally, in the above step S304, if the third control information is received, it can be determined whether to receive D2D data according to the third control information. If it is determined that D2D data is received, if the third control information is not indicated, Detect and receive D2D data on authorized frequency band resource blocks.

Example 2

This embodiment also provides a data transmission device, which is used to implement the above embodiments and preferred implementations. What has been described will not be described again. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

Figure 4 is a structural block diagram of a data transmission device according to an embodiment of the present invention. As shown in Figure 4, the device includes:

The first receiving module 42 is configured to receive data transmission requests reported by one or more source devices, where the data transmission requests are used to request the base station to transmit device-to-device D2D data between the source device and the destination device;

The allocation module 44 is coupled to the first receiving module 42, and is used to allocate unlicensed frequency band resources to one or more source devices according to the data transmission request, and obtain the allocation result of the unlicensed frequency band resources;

The delivery module 46 is coupled to the allocation module 44 and is used to deliver the allocation result, wherein the source device and/or the destination device transmits D2D data on the unlicensed frequency band according to the allocation result.

Optionally, the above data transmission device may be, but is not limited to, applied in a D2D data transmission scenario. For example: a scenario in which resources are allocated for D2D data transmission devices and D2D data transmission is performed.

Optionally, the above data transmission device may be applied to, but is not limited to, base stations, such as macro base stations, micro base stations, pico base stations, home base stations, etc.

Through the above device, the first receiving module receives data transmission requests reported by one or more source devices, where the data transmission requests are used to request the base station to transmit device-to-device D2D data between the source device and the destination device; the distribution module performs the data transmission according to the data The transmission request allocates unlicensed frequency band resources to one or more source devices, and obtains the allocation result of the unlicensed frequency band resources; the delivery module delivers the allocation result, in which the source device and/or the destination device are on the unlicensed frequency band according to the allocation result. To transmit D2D data, it can be seen that the above solution is used to allocate resources in the unlicensed frequency band for D2D data between the source device and the destination device through the base station, and the source device and/or the destination device use the unlicensed frequency band according to the allocation result. Therefore, the transmission of D2D data in the unlicensed frequency band is realized, thereby solving the problem in related technologies that D2D data cannot be transmitted in the unlicensed frequency band.

Optionally, the delivery module 46 is configured to: deliver the allocation results to one or more source devices and one or more destination devices corresponding to the source devices; or deliver the allocation results to one or more source devices.

Optionally, in the case where the delivery module 46 is used to deliver allocation results to one or more source devices and one or more destination devices corresponding to the source devices, the allocation results may include, but are not limited to: allocation for each source device. The resource block identifier of the unlicensed frequency band resource block and the first control information used to control data transmitted on the unlicensed frequency band resource block, where the resource block identifier is used to uniquely identify the unlicensed frequency band resource block.

Optionally, in the case where the delivery module 46 is used to deliver allocation results to one or more source devices, the allocation results may include, but are not limited to: resource block identifiers of unlicensed frequency band resource blocks allocated to each source device, Among them, the resource block identifier is used to uniquely identify the unlicensed frequency band resource block.

Optionally, the time slots of the communication frames on the unlicensed frequency band may, but are not limited to, include at least one of the following: dedicated time slots, backup time slots, and shared time slots.

Optionally, the allocation module is configured to: determine a proportion of resources allocated to each source device according to the second control information carried in the data transmission request for controlling the transmission of D2D data, wherein the resources include at least one of the following : Dedicated time slot resources, backup time slot resources, shared time slot resources; allocate dedicated time slots and/or backup time slots to each source device according to the determined proportion of resources and the second control information carried in each data transmission request resource block on.

Optionally, the device is also configured to perform a first clear channel assessment CCA test on the unlicensed frequency band before issuing the allocation result, and confirm that the unlicensed frequency band is occupied if the first CCA test is successful.

This embodiment also provides another data transmission device. Figure 5 is a structural block diagram of another data transmission device according to an embodiment of the present invention. As shown in Figure 5, the device includes:

The first sending module 52 is used to send a data transmission request to the base station, where the data transmission request is used to request the transmission of device-to-device D2D data between the source device and the destination device;

The second receiving module 54 is coupled to the first sending module 52 and is used to receive the allocation result of the unlicensed frequency band resources issued by the base station;

The second sending module 56 is coupled to the second receiving module 54 and is configured to send D2D data to the destination device on the unlicensed frequency band according to the allocation result.

Optionally, the above data transmission device may be, but is not limited to, applied in a D2D data transmission scenario. For example: a scenario in which resources are allocated for D2D data transmission devices and D2D data transmission is performed.

Optionally, the above data transmission device may be, but is not limited to, applied to a device that transmits D2D data, such as a source device that transmits D2D data.

Through the above device, the first sending module sends a data transmission request to the base station, where the data transmission request is used to request the transmission of device-to-device D2D data between the source device and the destination device; the second receiving module 54 receives the unauthorized data issued by the base station. The allocation result of frequency band resources; the second sending module sends D2D data to the destination device on the unlicensed frequency band according to the allocation result. It can be seen that the above solution is used to allocate the unlicensed frequency band for D2D data between the source device and the destination device according to the base station. The resource allocation results in transmitting D2D data. Therefore, the transmission of D2D data in the unlicensed frequency band is realized, thereby solving the problem in related technologies that D2D data cannot be transmitted in the unlicensed frequency band.

Optionally, the allocation result may, but is not limited to, include: a resource block identifier of an unlicensed frequency band resource block allocated for transmitting D2D data and first control information used to control data transmitted on the unlicensed frequency band resource block, where , the resource block identifier is used to uniquely identify the unlicensed frequency band resource block; or the allocation result may, but is not limited to, include: the resource block identifier of the unlicensed frequency band resource block allocated to the source device, where the resource block identifier is used to uniquely identify the unlicensed frequency band. Resource blocks.

Optionally, when the allocation result includes: the resource block identifier and the first control information, the second sending module 56 is configured to: send the D2D data on the unlicensed frequency band resource corresponding to the resource block identifier according to the instruction of the first control information. .

Optionally, when the allocation result includes: the resource block identifier, the second sending module 56 is configured to: send on the unlicensed frequency band resource corresponding to the resource block identifier for controlling the transmission of D2D data on the unlicensed frequency band. The third control information and D2D data.

Optionally, the time slots of communication frames on the unlicensed frequency band may, but are not limited to, include at least one of the following: dedicated time slots, backup time slots, and shared time slots; the allocation results may include, but are not limited to: allocated for transmitting D2D data. Resource block identifiers on dedicated time slots and/or resource block identifiers on spare time slots allocated for transmitting D2D data.

Optionally, the second sending module 56 is configured to: perform a second CCA detection on the dedicated time slot resource block on the dedicated time slot resource block corresponding to the resource block identifier on the allocated dedicated time slot; if the second CCA detection is successful, In this case, D2D data is sent on dedicated time slot resource blocks.

Optionally, the device is also configured to: after performing the second CCA detection on the dedicated time slot resource block on the dedicated time slot resource block corresponding to the resource block identifier on the allocated dedicated time slot, if the second CCA detection fails Under the condition, the third CCA detection with preset priority is performed on the spare time slot resource block corresponding to the resource block identifier on the allocated spare time slot; if the third CCA detection fails, while waiting After a preset time period, a third CCA detection with a preset priority is performed on the backup time slot resource block again; or, if the third CCA detection is successful, the source device transmits D2D data on the backup time slot resource block.

Optionally, the preset priority may be, but is not limited to, higher than the priority of CCA detection on the base station side, and/or, the preset priority may be, but is not limited to, the highest priority on the device side.

Optionally, the D2D device that has not completed transmission in the dedicated time slot needs to perform CCA detection first when transmitting data in the backup time slot. The CCA detection at this time has a higher priority than the CCA performed in the dedicated time slot. D2D devices that have not completed transmission in the spare time slot need to perform CCA detection first when transmitting data in the shared time slot. The CCA detection at this time has a higher priority than the CCA performed in the spare time slot.

Optionally, the device is also configured to: after performing a third CCA detection of a preset priority on the spare time slot resource block corresponding to the resource block identifier on the allocated spare time slot, when the source device When the transmission of D2D data is not completed on the spare time slot resource block, the transmission of D2D data is completed on the shared time slot.

This embodiment also provides yet another data transmission device. Figure 6 is a structural block diagram of yet another data transmission device according to an embodiment of the present invention. As shown in Figure 6, the device includes:

The third receiving module 62 is configured to receive the allocation result of unlicensed frequency band resources issued by the base station or the third control information used to control the transmission of device-to-device D2D data on the unlicensed frequency band;

The fourth receiving module 64 is coupled to the third receiving module 62 and configured to receive D2D data on the unlicensed frequency band according to the allocation result or the third control information.

Optionally, the above data transmission device may be, but is not limited to, applied in a D2D data transmission scenario. For example: a scenario in which resources are allocated for D2D data transmission devices and D2D data transmission is performed.

Optionally, the above data transmission device may be, but is not limited to, applied to a device that transmits D2D data, such as a destination device that transmits D2D data.

Through the above device, the third receiving module receives the allocation result of the unlicensed frequency band resources issued by the base station or the third control information used to control the transmission of device-to-device D2D data on the unlicensed frequency band; the fourth receiving module receives the allocation result according to the allocation The result or the third control information is to receive D2D data on the unlicensed frequency band. It can be seen that the above solution is used according to the allocation result of the resources of the unlicensed frequency band allocated by the base station for the D2D data between the source device and the destination device or the received user information. The third control information for controlling the transmission of device-to-device D2D data on the unlicensed frequency band receives the D2D data on the unlicensed frequency band. Therefore, the transmission of D2D data on the unlicensed frequency band is realized, thus solving the problems in related technologies. The problem that D2D data cannot be transmitted in unlicensed frequency bands.

Optionally, the fourth receiving module 64 is configured to detect and receive D2D data on the unlicensed frequency band resource block indicated by the allocation result.

Optionally, the fourth receiving module 64 is configured to: determine whether to receive D2D data according to the third control information; if it is determined that the D2D data is received, detect and receive D2D on the unlicensed frequency band resource block indicated by the third control information. data.

It should be noted that each of the above modules can be implemented through software or hardware. For the latter, it can be implemented in the following ways, but is not limited to this: the above modules are all located in the same processor; or the above modules are located on multiple processors. in the processor.

Example 3

In this embodiment, a data transmission system is provided. The system includes: a base station, a source device and a destination device, where,

The base station is used to receive data transmission requests reported by one or more source devices, where the data transmission request is used to request the base station to transmit device-to-device D2D data between the source device and the destination device; according to the data transmission request, it is one or Multiple source devices allocate unlicensed frequency band resources and obtain the allocation results of the unlicensed frequency band resources; issue the allocation results, in which the source device and/or the destination device transmit D2D data on the unlicensed frequency band according to the allocation results;

The source device is used to send a data transmission request to the base station; receive the allocation result of the unlicensed frequency band resources issued by the base station; send D2D data to the destination device on the unlicensed frequency band according to the allocation result;

The destination device is used to receive the allocation result of the unlicensed frequency band resources issued by the base station or the third control information used to control the transmission of D2D data in the unlicensed frequency band; according to the allocation result or the third control information, the unlicensed frequency band Receive D2D data on.

Optionally, the base station is configured to: deliver the allocation results to one or more source devices and one or more destination devices corresponding to the source devices; or, deliver the allocation results to one or more source devices.

Optionally, in the case where the base station is used to deliver allocation results to one or more source devices and one or more destination devices corresponding to the source devices, the allocation results include: allocating unlicensed frequency band resource blocks to each source device. The resource block identifier and the first control information used to control data transmitted on the unlicensed frequency band resource block, where the resource block identifier is used to uniquely identify the unlicensed frequency band resource block; used at the base station to issue the allocation result to a Or in the case of multiple source devices, the allocation result includes: allocating a resource block identifier of an unlicensed frequency band resource block to each source device, where the resource block identifier is used to uniquely identify the unlicensed frequency band resource block.

Optionally, the source device is configured to: when the allocation result includes: a resource block identifier and first control information, send D2D data on the unlicensed frequency band resource corresponding to the resource block identifier according to the instruction of the first control information.

Optionally, the source device is configured to: when the allocation result includes: a resource block identifier, send a third method for controlling the transmission of D2D data on the unlicensed frequency band on the unlicensed frequency band resource corresponding to the resource block identifier. Control information and D2D data.

Optionally, the destination device is configured to: detect and receive D2D data on the unlicensed frequency band resource block indicated by the allocation result.

Optionally, the destination device is configured to: determine whether to receive D2D data according to the third control information; if it is determined to receive D2D data, detect and receive the D2D data on the unlicensed frequency band resource block indicated by the third control information.

Detailed description will be given below in conjunction with optional embodiments of the present invention.

Based on License Assisted Access (LAA) technology, an optional embodiment of the present invention provides a resource allocation method for D2D communication to alleviate the problem of high load of LTE base stations and improve the performance of D2D communication in unlicensed Resource utilization on the frequency band. Therefore, this optional embodiment focuses on the resource allocation method of D2D communication in the unlicensed frequency band, considers the resource utilization under different situations (for example: first access success and first access failure), and implements the following functions:

1) The base station performs resource pre-allocation according to the reporting status of the D2D UE. When the base station detects an idle channel, the UE can perform corresponding data transmission according to the resource allocation result of the base station.

2) Different D2D UEs use unlicensed frequency bands for relevant data transmission according to the resource allocation results of the base station. If the UE successfully detects CCA, it will directly access the corresponding dedicated time slot. If the CCA fails, it will transfer to the backup time slot or shared time slot to transmit data.

3) The D2D communication frame is divided into dedicated slot, spare slot and shared slot: the communication resources corresponding to the dedicated slot are allocated by the base station according to the information reported by the UE; spare Time slots are pre-allocated by the base station based on UEs that report transmission requirements. The corresponding UE only has priority access rights and does not necessarily have to access the corresponding resources. Other UEs can also compete for access to the resources; communication of shared time slots Resources are accessed using random competition and backoff to reduce the possibility of conflicts between different D2D UEs. The above allocation method can reduce resource waste and improve resource utilization.

This optional embodiment proposes a resource allocation method with high resource utilization for D2D communication in unlicensed frequency bands. Based on the FBE frame structure proposed by LAA, according to the characteristics of D2D communication, the base station is used for macro control and pre-allocation of resources, by dividing the communication frame into dedicated slots, spare slots and shared slots. The time slot (shared slot) method solves the problem of how to reduce resource waste in various situations (UE succeeds in CCA and UE fails in CCA). The specific time slot allocation method may be determined by the data volume and service type of the D2D UE.

This optional embodiment provides two examples: an example of D2D UE reporting and time slot resource allocation and an example of D2D efficient data transmission.

In the example of resource allocation between D2D UEs and base stations, it is mainly aimed at communication between D2D UEs on unlicensed frequency bands in LAA scenarios.

Although the D2D communication corresponding to this example is performed on an unlicensed frequency band, it can still be controlled and allocated resources by the base station, and the process of control and resource allocation can be performed on the licensed frequency band.

Within a certain time window, D2D UEs that generate service transmission requirements can report data transmission requests to the base station. The base station pre-allocates resources based on the service classification and data volume carried in the summarized data transmission requests reported by the UE, and provides The same random seed is delivered to the corresponding D2D UE pair. The resource allocation method provided in this example can include the following steps:

Step 11. The UE reports a data transmission request: The D2D UE notifies the base station that it has an uplink scheduling request to transmit on the PUCCH through a Scheduling Request (SR), and requests the base station eNodeB to allocate uplink resources to it. Figure 7 is a schematic diagram of an instruction for a UE to transmit control information according to an optional embodiment of the present invention. As shown in Figure 7, the corresponding control information required for the UE to transmit data such as data source device ID, data destination device ID, service type, Data volume, priority, etc. are reported to the base station.

Step 12: The base station allocates resources in the unlicensed frequency band: the base station allocates resources based on the reporting results of the D2D UE. Figure 8 is a schematic diagram of resource allocation by a base station according to an optional embodiment of the present invention. As shown in Figure 8, in this example, the time slots of communication frames in the unlicensed frequency band are divided into the following three types: dedicated time slots and reserve time slots. time slots and shared time slots. The base station determines the ratio of the above three time slots based on the information reported by the UE to ensure that D2D communication is transmitted in dedicated time slots as much as possible. Among them, the resources on the dedicated time slot can be completely allocated by the base station, and the minimum granularity of resource allocation can be MRB (MiniResource Block). For example: an MRB contains 14 OFDM symbols in the time domain, and the time domain size is two time slots, that is, 1ms; it contains 12 consecutive subcarriers in the frequency domain, and the frequency domain size is 180kHz. Considering the possibility of CCA failure during the transmission process, for the backup time slots, the base station pre-allocates resources according to the reporting order of D2D UEs, but the allocated resources during the actual transmission process may still be occupied by other UEs. The base station does not allocate resources to shared time slots.

Step 13: The base station delivers the resource allocation result: the base station can send downlink scheduling information to the UE mainly through the PDCCH according to protocols 36.212 and 36.213. Figure 9 is a schematic diagram of the DCI format according to an optional embodiment of the present invention. As shown in Figure 9, each PDCCH can only carry a DCI of a certain format, that is, one PDCCH corresponds to a specific UE. Considering that the current PDCCH still has The remaining bits can be extended in the form of DCI to carry the corresponding base station allocation results.

In the example of data transmission based on base station allocation results, in the LAA scenario, in order to avoid interference with Wi-Fi signals or other LAA signals, the Listen Before Talk (LBT) method is generally adopted. The corresponding frame structure is reflected in the fact that before data is actually sent, there will be ClearChannel Assessment (CCA) in the corresponding frame structure.

The basic form of the frame structure used in this example is frame-based setting (FBE). This example aims to avoid resource waste and improve resource utilization. It mainly considers the success of the UE's first access to CCA and the failure of the UE's first access to CCA. The data transmission process in this case. Figure 10 is a flow chart of data transmission by a UE according to an optional embodiment of the present invention. As shown in Figure 10, the process includes the following processes:

Before D2D communication can be carried out in the unlicensed frequency band, the possession of the frequency band must first be confirmed through CCA. At this time, the CCA detection is completed by the base station. After the base station confirms its possession of the channel, the corresponding D2D UE must perform CCA again before D2D data interaction to ensure the occupation of the channel. The end position of CCA corresponding to the same time slot should be the same, that is, the starting point of effective data transmission should be the same.

In the dedicated time slot, each UE transmits data according to the arbitration result of the base station. Before transmission, CCA detection must be performed first. Assume that there are UE1 and UE2, where UE1 is the transmitter and UE2 is the receiver. The base station allocates the same MRB number to UE1 and UE2. If UE1 fails to perform CCA in the dedicated time slot, indicating that the allocated resources are occupied by other services, the corresponding data is transferred to the backup time slot for transmission, and UE2 can use the same MRB number to access the corresponding resources.

In the backup time slot, considering the possible CCA failure in the dedicated time slot, the base station has made preliminary allocation of resources by assigning MRB numbers to the D2D pairs. Although the base station has pre-allocated resources in advance, burst data generated during the transmission process can also be transmitted by occupying the resources of the spare time slot. In order to ensure that the D2D UE that fails to complete data interaction in the dedicated time slot occupies resources as much as possible, in the backup time slot, the D2D UE uses higher priority CCA detection to increase its preemption probability. Through the above design, D2D UEs that have not completed data transmission in the dedicated time slot will more easily access the channel for corresponding resource transmission.

In the shared time slot, D2D UEs that fail to complete data interaction in the dedicated time slot and backup time slot will complete data transmission through the existing D2D access method. For example, UE1 acts as the sender and UE2 acts as the receiver. Before data transmission, UE1 will send control signaling containing an ID identifier to UE2. After receiving the demodulation, UE2 can determine whether the data source is correct. If it is correct, it will receive the subsequent data; if incorrect, UE2 refuses to receive subsequent data.

In addition, if the energy detected by the base station after n CCA is less than the threshold, it is considered that the channel is available and the data interaction has been completed. The base station can choose to reclaim the channel for the next round of data transmission.

Depending on how the base station allocates resources, this example also provides another method for D2D data interaction in unlicensed frequency bands. Figure 11 is a flow chart of data transmission by another UE according to an optional embodiment of the present invention. As shown in Figure 11, the process includes the following steps:

Step S1102: The D2D UE reports a transmission request. The D2D UE notifies the base station that it has an uplink scheduling request to transmit through SR (Scheduling Request, SR) on the PUCCH, and requests the eNodeB to allocate uplink resources to it. Then, the corresponding UE reports data transmission control information such as data source device ID, data destination device ID, service type, data amount, priority, etc. to the base station on the uplink resources allocated by the base station. (The method is the same as Step 1 in 2.2.1)

Step S1104: The base station only allocates subframes to the D2D UE for transmission based on the reporting results. The specific resource allocation is determined by the D2D UE. The base station allocation results are issued.

Step S1106: Check whether the new channel is idle. If it is detected that the channel is idle, step S1108 is executed.

Step S1108, the D2D UE sends corresponding control information in the D2D control domain, including MRB resources for data transmission, transmission type, reference signal (Reference Signal) and other information. Considering that the D2D UE may fail CCA on the allocated resources, candidate resources for data transmission need to be specified in the control domain to ensure that the corresponding data transmission can be completed.

Step S1110: The D2D UE completes corresponding data transmission according to the control information on the control domain. Before each transmission, the D2D UE performs CCA detection to ensure channel possession. At the same time, it is necessary to ensure that the end position of CCA for D2D UEs occupying different frequency bands in the same time slot is the same, that is, the starting position of effective data transmission is consistent.

To sum up, the data transmission method, device and system in the embodiments and optional embodiments of the present invention divide the data transmission time of the communication frame into dedicated time slots, backup time slots and shared time slots, and the dedicated time slots are performed by the base station Fixed resource allocation is used for data transmission of reported UEs, with high resource utilization and no collisions. Secondly, the design of backup time slots can solve the problem of how to quickly access other available resources in the event of CCA failure. Since the UE corresponding to the CCA failure data has a shorter CCA, it can obtain a higher channel usage priority. level, ensuring the complete transmission of corresponding data services. When the backup resources are not occupied by data transmission retransmitted after CCA failure, they can be used by other D2DUEs with burst data to compete for access, thus avoiding waste of resources and improving resource utilization.

The above embodiments are only used to illustrate the technical solutions of the present invention but not to limit them. Those of ordinary skill in the art can modify or equivalently replace the technical solutions of the present invention without departing from the spirit and scope of the present invention. The scope of protection shall be determined by the claims.

Example 4

Through the description of the above embodiments, those skilled in the art can clearly understand that the method according to the above embodiments can be implemented by means of software plus the necessary general hardware platform. Of course, it can also be implemented by hardware, but in many cases the former is Better implementation. Based on this understanding, the technical solution of the present invention can be embodied in the form of a software product in essence or the part that contributes to the existing technology. The computer software product is stored in a storage medium (such as ROM/RAM, disk, CD), including several instructions to cause a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present invention.

An embodiment of the present invention also provides a storage medium. Optionally, in this embodiment, the above-mentioned storage medium may be configured to store program codes for performing the following steps:

S11. Receive data transmission requests reported by one or more source devices, where the data transmission requests are used to request the base station to transmit device-to-device D2D data between the source device and the destination device;

S12, allocate unlicensed frequency band resources to one or more source devices according to the data transmission request, and obtain the allocation result of the unlicensed frequency band resources;

S13. Send the allocation result, in which the source device and/or the destination device transmit D2D data on the unlicensed frequency band according to the allocation result.

Optionally, the storage medium is also configured to store program codes for executing the method steps described in the above embodiments:

S21. Send a data transmission request to the base station, where the data transmission request is used to request the transmission of device-to-device D2D data between the source device and the destination device;

S22: Receive the allocation result of unlicensed frequency band resources issued by the base station;

S23: Send D2D data to the destination device on the unlicensed frequency band according to the allocation result.

Optionally, in this embodiment, the above-mentioned storage medium may include but is not limited to: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic Various media that can store program code, such as discs or optical disks.

Optionally, in this embodiment, the processor executes the method steps described in the above embodiment according to the program code stored in the storage medium.

Optionally, for specific examples in this embodiment, reference can be made to the examples described in the above-mentioned embodiments and optional implementations, and details will not be described again in this embodiment.

Obviously, those skilled in the art should understand that the above-mentioned modules or steps of the present invention can be implemented using general-purpose computing devices. They can be concentrated on a single computing device, or distributed across a network composed of multiple computing devices. , optionally, they may be implemented in program code executable by a computing device, such that they may be stored in a storage device for execution by the computing device, and in some cases, may be in a sequence different from that herein. The steps shown or described are performed either individually as individual integrated circuit modules, or as multiple modules or steps among them as a single integrated circuit module. As such, the invention is not limited to any specific combination of hardware and software.

The above descriptions are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims (33)

1. A data transmission method applied to a base station, comprising:

receiving a data transmission request reported by one or more source devices, wherein the data transmission request is used for requesting a base station to transmit device-to-device (D2D) data between the source device and a destination device;

respectively distributing unauthorized frequency band resources to one or more source devices according to the data transmission request to obtain a distribution result of the unauthorized frequency band resources;

performing first idle channel assessment (CCA) detection on the unlicensed frequency band corresponding to the allocation result;

under the condition that the first CCA detection is successful, confirming that the unlicensed frequency band is occupied, and issuing the allocation result, wherein the source equipment and/or the destination equipment transmit the D2D data on the unlicensed frequency band according to the allocation result;

wherein the time slot of the communication frame on the unlicensed band includes at least one of: dedicated time slot, spare time slot, shared time slot.

2. The method of claim 1, wherein issuing the allocation result comprises:

issuing the distribution result to the one or more source devices and destination devices corresponding to the one or more source devices; or alternatively

And transmitting the distribution result to the one or more source devices.

3. The method of claim 2, wherein the step of determining the position of the substrate comprises,

and under the condition that the distribution result is sent to the one or more source devices and the destination devices corresponding to the one or more source devices, the distribution result comprises: allocating a resource block identifier of an unlicensed frequency band resource block and first control information for controlling data transmitted on the unlicensed frequency band resource block to each source device, wherein the resource block identifier is used for uniquely identifying the unlicensed frequency band resource block;

in the case of issuing the allocation result to the one or more source devices, the allocation result includes: and allocating a resource block identifier of an unlicensed frequency band resource block for each source device, wherein the resource block identifier is used for uniquely identifying the unlicensed frequency band resource block.

4. The method of claim 1, wherein allocating unlicensed band resources to the one or more source devices in accordance with the data transmission request comprises:

determining a proportion of resources allocated to each source device according to second control information carried in the data transmission request and used for controlling the transmission of the D2D data, wherein the resources comprise at least one of the following: dedicated slot resources, spare slot resources, shared slot resources;

And distributing resource blocks on the special time slot and/or the standby time slot for each source device according to the determined proportion of the resources and the second control information carried in each data transmission request.

5. A data transmission method, comprising:

transmitting a data transmission request to a base station, wherein the data transmission request is used for requesting transmission of device-to-device (D2D) data between a source device and a destination device;

receiving an allocation result of the unlicensed frequency band resources issued by the base station;

transmitting the D2D data to the target equipment on an unlicensed frequency band according to the allocation result;

the base station performs first idle channel assessment (CCA) detection on an unlicensed frequency band corresponding to the allocation result; under the condition that the first CCA is successfully detected, confirming that the unlicensed frequency band is occupied, and issuing an allocation result of the unlicensed frequency band resources;

wherein the time slot of the communication frame on the unlicensed band includes at least one of: dedicated time slot, spare time slot, shared time slot.

6. The method of claim 5, wherein the step of determining the position of the probe is performed,

the allocation result includes: a resource block identifier of an unlicensed frequency band resource block allocated for transmitting the D2D data and first control information for controlling data transmitted on the unlicensed frequency band resource block, wherein the resource block identifier is used for uniquely identifying the unlicensed frequency band resource block; or alternatively

The allocation result includes: and a resource block identifier of an unlicensed frequency band resource block allocated to the source device, wherein the resource block identifier is used for uniquely identifying the unlicensed frequency band resource block.

7. The method of claim 6, wherein the assigning a result comprises: the sending the D2D data on the unlicensed frequency band according to the allocation result under the condition of the resource block identifier and the first control information includes:

and transmitting the D2D data according to the indication of the first control information on the unlicensed frequency band resources corresponding to the resource block identifiers.

8. The method of claim 6, wherein the assigning a result comprises: under the condition of the resource block identification, transmitting the D2D data on the unlicensed frequency band according to the allocation result includes:

and transmitting third control information and the D2D data, which are used for controlling the transmission of the D2D data on the unlicensed frequency band, on the unlicensed frequency band resources corresponding to the resource block identifiers.

9. The method of claim 5, wherein the step of determining the position of the probe is performed,

the allocation result includes: the resource block identification on the dedicated time slot allocated for transmitting the D2D data and/or the resource block identification on the spare time slot allocated for transmitting the D2D data.

10. The method of claim 9, wherein transmitting the D2D data over the unlicensed band according to the allocation result comprises:

performing a second CCA detection on the dedicated time slot resource block corresponding to the resource block identifier of the allocated dedicated time slot;

and if the second CCA detection is successful, transmitting the D2D data on the special time slot resource block.

11. The method of claim 10, wherein after the second CCA detection of the dedicated slot resource block on the dedicated slot resource block corresponding to the resource block identification on the allocated dedicated slot, the method further comprises:

under the condition that the second CCA detection fails, performing third CCA detection of a preset priority on the spare time slot resource block corresponding to the resource block identifier on the allocated spare time slot;

carrying out third CCA detection of the preset priority again on the standby time slot resource block after waiting for a preset time length under the condition that the third CCA detection fails; or if the third CCA detection is successful, the source device transmits the D2D data on the spare time slot resource block.

12. The method according to claim 11, wherein the preset priority is higher than a priority of CCA detection at a base station side and/or the preset priority is a highest priority at a device side.

13. The method of claim 11, wherein after a third CCA detection of a preset priority for a resource block of the spare time slot on a resource block of the spare time slot corresponding to the resource block identification of the spare time slot allocated, the method further comprises:

and when the source equipment does not complete the transmission of the D2D data on the spare time slot resource block, completing the transmission of the D2D data on the shared time slot.

14. A data transmission method, comprising:

receiving an allocation result of unlicensed frequency band resources issued by a base station or third control information for controlling transmission of device-to-device (D2D) data on an unlicensed frequency band;

receiving the D2D data on an unlicensed frequency band according to the allocation result or the third control information;

the base station performs first idle channel assessment (CCA) detection on an unlicensed frequency band corresponding to the allocation result; under the condition that the first CCA is successfully detected, confirming that the unlicensed frequency band is occupied, and issuing an allocation result of the unlicensed frequency band resources;

Wherein the time slot of the communication frame on the unlicensed band includes at least one of: dedicated time slot, spare time slot, shared time slot.

15. The method of claim 14, wherein receiving the D2D data on an unlicensed frequency band according to the allocation result comprises:

and detecting and receiving the D2D data on the unlicensed frequency band resource block indicated by the allocation result.

16. The method of claim 14, wherein receiving the D2D data on an unlicensed frequency band according to the third control information comprises:

judging whether to receive the D2D data according to the third control information;

and detecting and receiving the D2D data on the unlicensed frequency band resource block indicated by the third control information under the condition that the D2D data is received.

17. A data transmission apparatus for use in a base station, comprising:

the first receiving module is used for receiving data transmission requests reported by one or more source devices, wherein the data transmission requests are used for requesting a base station to transmit device-to-device (D2D) data between the source devices and the destination devices;

the allocation module is used for allocating the unlicensed frequency band resources to the one or more source devices according to the data transmission request to obtain an allocation result of the unlicensed frequency band resources;

The issuing module is used for issuing the distribution result under the condition that the first idle channel assessment CCA detection is successful, wherein the source equipment and/or the destination equipment transmit the D2D data on an unlicensed frequency band according to the distribution result;

the device is further used for performing first idle channel assessment (CCA) detection on the unlicensed frequency band corresponding to the allocation result; under the condition that the first CCA detection is successful, confirming that the unlicensed frequency band is occupied;

wherein the time slot of the communication frame on the unlicensed band includes at least one of: dedicated time slot, spare time slot, shared time slot.

18. The apparatus of claim 17, wherein the issuing module is configured to:

issuing the distribution result to the one or more source devices and destination devices corresponding to the one or more source devices; or,

and transmitting the distribution result to the one or more source devices.

19. The apparatus of claim 18, wherein the device comprises a plurality of sensors,

the distribution result includes, when the distribution module is configured to distribute the distribution result to the one or more source devices and destination devices corresponding to the one or more source devices: allocating a resource block identifier of an unlicensed frequency band resource block and first control information for controlling data transmitted on the unlicensed frequency band resource block to each source device, wherein the resource block identifier is used for uniquely identifying the unlicensed frequency band resource block;

In the case that the issuing module is configured to issue the allocation result to the one or more source devices, the allocation result includes: and allocating a resource block identifier of an unlicensed frequency band resource block for each source device, wherein the resource block identifier is used for uniquely identifying the unlicensed frequency band resource block.

20. A data transmission apparatus, comprising:

a first sending module, configured to send a data transmission request to a base station, where the data transmission request is used to request transmission of device-to-device D2D data between a source device and a destination device;

the second receiving module is used for receiving the distribution result of the unlicensed frequency band resources issued by the base station;

the second sending module is used for sending the D2D data to the destination equipment on an unauthorized frequency band according to the distribution result;

the device further comprises the base station, and is used for performing first idle channel assessment (CCA) detection on the unlicensed frequency band corresponding to the allocation result; under the condition that the first CCA is successfully detected, confirming that the unlicensed frequency band is occupied, and issuing an allocation result of the unlicensed frequency band resources;

wherein the time slot of the communication frame on the unlicensed band includes at least one of: dedicated time slot, spare time slot, shared time slot.

21. The apparatus of claim 20, wherein the device comprises a plurality of sensors,

the allocation result includes: a resource block identifier of an unlicensed frequency band resource block allocated for transmitting the D2D data and first control information for controlling data transmitted on the unlicensed frequency band resource block, wherein the resource block identifier is used for uniquely identifying the unlicensed frequency band resource block; or alternatively

The allocation result includes: and a resource block identifier of an unlicensed frequency band resource block allocated to the source device, wherein the resource block identifier is used for uniquely identifying the unlicensed frequency band resource block.

22. The apparatus of claim 21, wherein the second transmitting module is configured to:

the distribution result comprises the following steps: and under the condition of the resource block identifier and the first control information, transmitting the D2D data on the unlicensed frequency band resource corresponding to the resource block identifier according to the indication of the first control information.

23. The apparatus of claim 21, wherein the second transmitting module is configured to:

the distribution result comprises the following steps: and under the condition of the resource block identifier, third control information and the D2D data, which are used for controlling the transmission of the D2D data on the unlicensed frequency band, are sent on the unlicensed frequency band resource corresponding to the resource block identifier.

24. A data transmission apparatus, comprising:

the third receiving module is used for receiving an allocation result of the unlicensed frequency band resources issued by the base station or third control information used for controlling transmission of the device-to-device (D2D) data on the unlicensed frequency band;

a fourth receiving module, configured to receive the D2D data on an unlicensed frequency band according to the allocation result or the third control information;

the device further comprises the base station, and is used for performing first idle channel assessment (CCA) detection on the unlicensed frequency band corresponding to the allocation result; under the condition that the first CCA is successfully detected, confirming that the unlicensed frequency band is occupied, and issuing an allocation result of the unlicensed frequency band resources;

wherein the time slot of the communication frame on the unlicensed band includes at least one of: dedicated time slot, spare time slot, shared time slot.

25. The apparatus of claim 24, wherein the fourth receiving module is configured to:

and detecting and receiving the D2D data on the unlicensed frequency band resource block indicated by the allocation result.

26. The apparatus of claim 24, wherein the fourth receiving module is configured to:

Judging whether to receive the D2D data according to the third control information;

and detecting and receiving the D2D data on the unlicensed frequency band resource block indicated by the third control information under the condition that the D2D data is received.

27. A data transmission system, comprising: a base station, a source device and a destination device, wherein,

the base station is configured to receive a data transmission request reported by one or more source devices, where the data transmission request is used to request the base station to transmit device-to-device D2D data between the source device and the destination device; respectively distributing unauthorized frequency band resources to one or more source devices according to the data transmission request to obtain a distribution result of the unauthorized frequency band resources; performing first idle channel assessment (CCA) detection on the unlicensed frequency band corresponding to the allocation result; under the condition that the first CCA detection is successful, confirming that the unlicensed frequency band is occupied, and issuing the distribution result, wherein the source equipment and/or the destination equipment transmits the D2D data on the unlicensed frequency band according to the distribution result;

the source device is configured to send the data transmission request to the base station; receiving an allocation result of the unlicensed frequency band resources issued by the base station; transmitting the D2D data to the target equipment on an unlicensed frequency band according to the allocation result;

The destination device is configured to receive an allocation result of an unlicensed frequency band resource issued by the base station or third control information for controlling transmission of the D2D data on an unlicensed frequency band; receiving the D2D data on an unlicensed frequency band according to the allocation result or the third control information;

wherein the time slot of the communication frame on the unlicensed band includes at least one of: dedicated time slot, spare time slot, shared time slot.

28. The system of claim 27, wherein the base station is configured to:

issuing the distribution result to the one or more source devices and destination devices corresponding to the one or more source devices; or alternatively

And transmitting the distribution result to the one or more source devices.

29. The system of claim 28, wherein the system further comprises a controller configured to control the controller,

and when the base station is used for sending the allocation result to the one or more source devices and the destination devices corresponding to the one or more source devices, the allocation result comprises: allocating a resource block identifier of an unlicensed frequency band resource block and first control information for controlling data transmitted on the unlicensed frequency band resource block to each source device, wherein the resource block identifier is used for uniquely identifying the unlicensed frequency band resource block;

In the case that the base station is configured to issue the allocation result to the one or more source devices, the allocation result includes: and allocating a resource block identifier of an unlicensed frequency band resource block for each source device, wherein the resource block identifier is used for uniquely identifying the unlicensed frequency band resource block.

30. The system of claim 29, wherein the source device is configured to:

the distribution result comprises the following steps: and under the condition of the resource block identifier and the first control information, transmitting the D2D data on the unlicensed frequency band resource corresponding to the resource block identifier according to the indication of the first control information.

31. The system of claim 29, wherein the source device is configured to:

the distribution result comprises the following steps: and under the condition of the resource block identifier, third control information and the D2D data, which are used for controlling the transmission of the D2D data on the unlicensed frequency band, are sent on the unlicensed frequency band resource corresponding to the resource block identifier.

32. The system of claim 27, wherein the destination device is configured to:

and detecting and receiving the D2D data on the unlicensed frequency band resource block indicated by the allocation result.

33. The system of claim 28, wherein the destination device is configured to:

judging whether to receive the D2D data according to the third control information;

and detecting and receiving the D2D data on the unlicensed frequency band resource block indicated by the third control information under the condition that the D2D data is received.