CN107548070B

CN107548070B - Data transmission method, device and system

Info

Publication number: CN107548070B
Application number: CN201610482725.8A
Authority: CN
Inventors: 许文俊; 付卓然; 赵捷; 李雪; 苟伟
Original assignee: ZTE Corp
Current assignee: ZTE Corp
Priority date: 2016-06-27
Filing date: 2016-06-27
Publication date: 2023-10-27
Anticipated expiration: 2036-06-27
Also published as: CN107548070A

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 in particular, to a data transmission method, apparatus, and system.

Background

In a cellular mobile communication system centering on a base station, the system still has problems in terms of coverage, capacity, and the like. Numerous studies have shown that Device-to-Device (D2D) communication has unique advantages in terms of saving resources, reducing interference, and improving transmission efficiency. In the D2D communication mode, data interaction is directly performed between users without passing through a base station, and the base station only needs to macroscopically control device communication. In view of this, combining the D2D technology with the LTE system can greatly reduce the communication load of the base station, expand the coverage area of the cell and improve the service quality of the cell edge users, thereby improving the overall throughput of the cell.

With the inadequacy of the research of the D2D-LTE technology, the resource allocation method for the LTE/LTE-A cellular communication system and the D2D communication technology is also endless. However, the current resource allocation method of the D2D communication technology is performed in the licensed band. However, with the wide deployment of the fourth generation mobile communication system in the world, the spectrum utilization of LTE has gradually reached a bottleneck, and further improvement of the utilization rate of the licensed spectrum requires fundamental technical innovation or thorough upgrade of hardware devices, which is too costly.

Aiming at the problem that D2D data cannot be transmitted in an unlicensed frequency band in the related art, no effective solution exists at present.

Disclosure of Invention

The embodiment of the invention provides a data transmission method, a device and a system, which are used for at least solving the problem that D2D data cannot be transmitted in an unauthorized frequency band in the related technology.

According to an embodiment of the present invention, there is provided a data transmission method including: 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; and issuing the distribution result, wherein the source equipment and/or the destination equipment transmit the D2D data on an unauthorized frequency band according to the distribution result.

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

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

Optionally, the time slots of the communication frame on the unlicensed band include at least one of: dedicated time slot, spare time slot, shared time slot.

Optionally, allocating unlicensed band resources to the one or more source devices according to the data transmission request includes: 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.

Optionally, before issuing the allocation result, the method further includes: performing first Clear Channel Assessment (CCA) detection on the unlicensed frequency band; and under the condition that the first CCA detection is successful, confirming that the unlicensed frequency band is occupied.

According to another embodiment of the present invention, there is provided a data transmission method including: 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; and sending the D2D data to the destination equipment 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 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 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.

Optionally, the allocation result includes: 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.

Optionally, the allocation result includes: 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.

Optionally, the time slots of the communication frame on the unlicensed band include at least one of: dedicated time slots, spare time slots, shared time slots; 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.

Optionally, sending the D2D data on the unlicensed frequency band according to the allocation result includes: 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.

Optionally, after the second CCA detection is performed on the dedicated slot resource block corresponding to the resource block identifier on the allocated dedicated slot, the method further includes: 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.

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

Optionally, after performing a third CCA detection of a preset priority on the spare time slot resource block corresponding to the resource block identifier of the allocated spare time slot, the method further includes: 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.

According to another embodiment of the present invention, there is provided a data transmission method including: 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; and receiving the D2D data on an 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: and detecting and receiving the D2D data on the unlicensed frequency band resource block indicated by the allocation result.

Optionally, receiving the D2D data on an unlicensed frequency band according to the third control information includes: 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.

According to another embodiment of the present invention, there is provided a data transmission apparatus including: 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; and the issuing module is used for issuing the distribution result, wherein the source equipment and/or the destination equipment transmit the D2D data on an unauthorized frequency band according to the distribution result.

Optionally, 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, issuing the allocation result to the one or more source devices.

Optionally, when the issuing module is configured to issue the allocation result to the one or more source devices and destination devices corresponding to the one or more source devices, the allocation result includes: 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.

According to another embodiment of the present invention, there is provided a data transmission apparatus including: 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; and the second sending module is used for sending the D2D data to the destination equipment 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 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; 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.

Optionally, the second sending 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.

Optionally, the second sending 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.

According to another embodiment of the present invention, there is provided a data transmission apparatus including: 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; and 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.

Optionally, 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.

Optionally, 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.

According to another embodiment of the present invention, there is provided a data transmission system including: the base station is used for receiving one or more data transmission requests reported by the source equipment, wherein the data transmission requests are used for requesting the base station to transmit device-to-device (D2D) data between the source equipment and the destination equipment; 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; issuing the distribution result, wherein the source equipment and/or the destination equipment transmit the D2D data on an unauthorized 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; and receiving the D2D data on an unlicensed frequency band according to the allocation result or the third control information.

Optionally, 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, issuing the allocation result to the one or more source devices.

Optionally, when the base station is configured to issue the allocation result to the one or more source devices and destination devices corresponding to the one or more source devices, the allocation result includes: 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.

Optionally, 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.

Optionally, 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.

Optionally, 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.

Optionally, 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.

According to the invention, a data transmission request reported by one or more source devices is received, wherein the data transmission request is used for requesting a base station to transmit device-to-device (D2D) data between the source device and the 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; the distribution result is issued, wherein the source device and/or the destination device transmit D2D data on the unlicensed frequency band according to the distribution result, so that the problem that the D2D data cannot be transmitted on the unlicensed frequency band in the related art is solved by adopting the scheme to distribute resources of the unlicensed frequency band for the D2D data between the source device and the destination device through the base station and issuing the distribution result for transmitting the D2D data on the unlicensed frequency band according to the distribution result by the source device and/or the destination device.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

fig. 1 is a flowchart of a data transmission method according to an embodiment of the present application;

FIG. 2 is a flow chart of another data transmission method according to an embodiment of the present application;

FIG. 3 is a flow chart of yet another data transmission method according to an embodiment of the present application;

fig. 4 is a block diagram of a data transmission apparatus according to an embodiment of the present application;

fig. 5 is a block diagram of another data transmission apparatus according to an embodiment of the present application;

fig. 6 is a block diagram of a data transmission apparatus according to still another embodiment of the present application;

fig. 7 is a schematic diagram of an instruction of a UE to transmit control information according to an alternative embodiment of the present application;

fig. 8 is a schematic diagram of resource allocation by a base station according to an alternative embodiment of the present application;

fig. 9 is a schematic diagram of a DCI format according to an alternative embodiment of the present application;

fig. 10 is a flow chart of data transmission by a UE in accordance with an alternative embodiment of the present application;

fig. 11 is a flowchart of another UE transmitting data according to an alternative embodiment of the present application.

Detailed Description

The application will be described in detail hereinafter with reference to the drawings in conjunction with embodiments. It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order.

Example 1

In this embodiment, a data transmission method is provided, fig. 1 is a flowchart of a data transmission method according to an embodiment of the present application, and as shown in fig. 1, the flowchart includes the following steps:

step S102, 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;

step S104, 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 step S106, issuing an 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.

Alternatively, the data transmission method described above may be applied, but not limited to, in the context of D2D data transmission. For example: and allocating resources for the devices for D2D data transmission and performing the D2D data transmission.

Alternatively, the above data transmission method may be applied to, but not limited to, a base station, for example: macro base station, micro base station, pico base station, home base station, etc.

Through the 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 the 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; the allocation result is issued, wherein the source device and/or the destination device transmit 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 technology is solved by adopting the scheme to allocate resources of the unlicensed frequency band for the D2D data between the source device and the destination device through the base station and issuing the allocation result for transmitting the D2D data on the unlicensed frequency band according to the allocation result by the source device and/or the destination device.

Alternatively, the allocation result sent by the base station may be sent to the source device and the destination device at the same time, or may be sent only to the source device. For example: issuing an allocation result to one or more source devices and destination devices corresponding to the one or more source devices; or issue the allocation result to one or more source devices.

Optionally, in a case of issuing an allocation result to one or more source devices and destination devices corresponding to the one or more source devices, the allocation result may include, but is not limited to: a resource block identifier of an unlicensed frequency band resource block allocated to each source device 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; in the case of issuing an allocation result to one or more source devices, the allocation result may include, but is not limited to: and a resource block identifier of the unlicensed frequency band resource block allocated to each source device, wherein the resource block identifier is used for uniquely identifying the unlicensed frequency band resource block.

Alternatively, the time slots of the communication frames on the unlicensed band may be segmented according to different usage patterns. For example: the time slots of the communication frames on the unlicensed band include at least one of: dedicated time slot, spare time slot, shared time slot. Wherein the dedicated time slot may be a time slot resource used by the designated device, the dedicated time slot being dedicated to transmitting data of the designated device. The spare time slots may be pre-allocated to the designated device and may transmit data for other devices in addition to the designated device.

Optionally, in order to complete data transmission on the 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 include, but is not limited to, the amount of data to be transmitted and the type of data, the proportion of resources available to the three time slot allocation devices, and then the resources are allocated according to the allocated proportion. For example: 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 time slot resources, standby time slot resources and shared time slot resources are allocated to each source device according to the determined proportion of the resources and the second control information carried in each data transmission request.

Optionally, in order to ensure availability of resources, CCA detection may be performed on the channel before step S106, but is not limited to, and if the detection is successful, the unlicensed band is occupied. For example: and carrying out first idle channel assessment (CCA) detection on the unlicensed frequency band, and confirming that the unlicensed frequency band is occupied under the condition that the first CCA detection is successful.

In this embodiment, another data transmission method is also provided, and fig. 2 is a flowchart of another data transmission method according to an embodiment of the present invention, as shown in fig. 2, where the flowchart includes the following steps:

step S202, a data transmission request is sent 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;

step S204, receiving an allocation result of unlicensed frequency band resources issued by a base station;

step S206, D2D data is sent to the destination device on the unlicensed frequency band according to the allocation result.

Alternatively, the above data transmission method may be applied to, but not limited to, a device for transmitting D2D data, for example: a source device transmitting D2D data.

Through the steps, a data transmission request is sent to the base station, wherein the data transmission request is used for requesting to transmit device-to-device (D2D) data between the source device and the destination device; receiving an allocation result of unlicensed frequency band resources issued by a base station; according to the allocation result, D2D data is sent to the destination device on the unlicensed frequency band, so that the D2D data is transmitted according to the allocation result of the resources of the unlicensed frequency band, which are allocated to the D2D data between the source device and the destination device by the base station, so that the D2D data is transmitted on the unlicensed frequency band, and the problem that the D2D data cannot be transmitted on the unlicensed frequency band in the related art is solved.

Alternatively, the allocation results may include, but are not limited to: a resource block identifier of an unlicensed frequency band resource block allocated for transmitting 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 the allocation results may include, but are not limited to: and a resource block identifier of the 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.

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

Optionally, the allocation result includes: in the case of the resource block identifier, in the above step S206, third control information for controlling transmission of D2D data on the unlicensed band and D2D data are transmitted on the unlicensed band resource corresponding to the resource block identifier.

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

Optionally, in the step S206, a second CCA detection may be performed on the unlicensed band before transmitting data. For example: and performing second CCA detection on the special time slot resource block corresponding to the resource block identifier of the allocated special time slot, and transmitting D2D data on the special time slot resource block under the condition that the second CCA detection is successful.

Optionally, after performing the second CCA detection 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, 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, and if the third CCA detection fails, re-performing the third CCA detection of the preset priority on the spare time slot resource block after waiting for a preset duration; or, in case 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 being, higher than the priority of CCA detection at the base station side, and/or the preset priority may be, but is not limited to, the highest priority at the device side.

Optionally, when the dedicated time slot does not complete the D2D device transmitting data, a CCA detection needs to be performed first when the spare time slot transmits data, where the CCA detection has a higher priority than the CCA performed by the dedicated time slot. When the D2D device that does not complete transmission in the spare time slot performs data transmission in the shared time slot, CCA detection needs to be performed first, where CCA detection is higher in priority than 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 does not complete the transmission of the D2D data on the spare time slot resource block, the transmission of the D2D data may be completed on the shared time slot.

In this embodiment, there is further provided a data transmission method, and fig. 3 is a flowchart of a further data transmission method according to an embodiment of the present invention, as shown in fig. 3, where the flowchart includes the following steps:

step S302, receiving an allocation result of an unlicensed frequency band resource issued by a base station or third control information for controlling transmission of device-to-device (D2D) data on an unlicensed frequency band;

step S304, D2D data is received on the unlicensed frequency band according to the allocation result or the third control information.

Alternatively, the above data transmission method may be applied to, but not limited to, a device for transmitting D2D data, for example: destination device transmitting D2D data.

Through the steps, the allocation result of the unlicensed frequency band resources issued by the base station or third control information for controlling the transmission of the device-to-device (D2D) data on the unlicensed frequency band is received; according to the allocation result or the third control information, the D2D data is received on the unlicensed frequency band, so that the D2D data is transmitted on the unlicensed frequency band, and the problem that the D2D data cannot be transmitted on the unlicensed frequency band in the related art is solved.

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

Alternatively, in the above step S304, if the third control information is received, it may be determined whether to receive the D2D data according to the third control information, and if it is determined that the D2D data is received, the D2D data is detected and received on the unlicensed band resource block indicated by the third control information.

Example 2

The embodiment also provides a data transmission device, which is used for implementing the above embodiment and the preferred implementation manner, and is not described in detail. As used below, the term "module" may be a combination of software and/or hardware that implements a predetermined function. While the means described in the following embodiments are preferably implemented in software, implementation in hardware, or a combination of software and hardware, is also possible and contemplated.

Fig. 4 is a block diagram of a data transmission apparatus according to an embodiment of the present invention, as shown in fig. 4, including:

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

an allocation module 44, coupled to the first receiving module 42, for allocating unlicensed frequency band resources to one or more source devices according to the data transmission request, so as to obtain an allocation result of the unlicensed frequency band resources;

A transmitting module 46, coupled to the distributing module 44, for transmitting the distribution result, wherein the source device and/or the destination device transmits the D2D data on the unlicensed frequency band according to the distribution result.

Alternatively, the data transmission device may be applied to, but not limited to, a D2D data transmission scenario. For example: and allocating resources for the devices for D2D data transmission and performing the D2D data transmission.

Alternatively, the above data transmission device may be applied to, but not limited to, a base station, for example: macro base station, micro base station, pico base station, home base station, etc.

Through the device, the first receiving module receives the data transmission request reported by one or more source devices, wherein the data transmission request is used for requesting the base station to transmit the device-to-device (D2D) data between the source device and the destination device; the allocation module allocates unlicensed frequency band resources to one or more source devices according to the data transmission request, and obtains allocation results of the unlicensed frequency band resources; the issuing module issues the allocation result, wherein the source device and/or the destination device transmit the D2D data on the unlicensed frequency band according to the allocation result, so that it can be seen that the above scheme is adopted to allocate resources of the unlicensed frequency band for the D2D data between the source device and the destination device through the base station, and issue the allocation result for transmitting the D2D data on the unlicensed frequency band according to the allocation result by the source device and/or the destination device, so that the transmission of the D2D data on the unlicensed frequency band is realized, and the problem that the D2D data cannot be transmitted on the unlicensed frequency band in the related art is solved.

Optionally, the issuing module 46 is configured to: issuing an allocation result to one or more source devices and destination devices corresponding to the one or more source devices; or issue the allocation result to one or more source devices.

Optionally, in a case where the issuing module 46 is configured to issue the allocation result to one or more source devices and destination devices corresponding to the one or more source devices, the allocation result may include, but is not limited to: the method comprises the steps of allocating a resource block identifier of an unlicensed frequency band resource block for each source device 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.

Alternatively, where the issuing module 46 is configured to issue the allocation result to one or more source devices, the allocation result may include, but is not limited to: and a resource block identifier of the unlicensed frequency band resource block allocated to each source device, wherein the resource block identifier is used for uniquely identifying the unlicensed frequency band resource block.

Alternatively, the time slots of the communication frames on the unlicensed band may include, but are not limited to, at least one of: dedicated time slot, spare time slot, shared time slot.

Optionally, the allocation module is configured to: 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 allocating a resource block on a dedicated time slot and/or a 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.

Optionally, the device is further configured to: before the distribution result is issued, the first idle channel assessment CCA detection is carried out on the unlicensed frequency band, and under the condition that the first CCA detection is successful, the occupation of the unlicensed frequency band is confirmed.

In this embodiment, there is further provided another data transmission apparatus, and fig. 5 is a block diagram of another data transmission apparatus according to an embodiment of the present invention, as shown in fig. 5, including:

a first sending module 52, configured to send a data transmission request to the base station, where the data transmission request is used to request 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 configured to receive an allocation result of the unlicensed frequency band resource issued by the base station;

A second transmitting module 56, coupled to the second receiving module 54, is configured to transmit D2D data to the destination device on the unlicensed frequency band according to the allocation result.

Alternatively, the above-mentioned data transmission apparatus may be applied to, but not limited to, devices for transmitting D2D data, such as: a source device transmitting D2D data.

Through the device, the first sending module sends a data transmission request to the base station, wherein the data transmission request is used for requesting to transmit device-to-device (D2D) data between the source device and the destination device; the second receiving module 54 receives an allocation result of the unlicensed frequency band resources issued by the base station; the second sending module sends the D2D data to the destination device on the unlicensed frequency band according to the allocation result, so that the D2D data is transmitted according to the allocation result of the resources of the unlicensed frequency band, which are allocated to the D2D data between the source device and the destination device by the base station, so that the D2D data is transmitted on the unlicensed frequency band, and the problem that the D2D data cannot be transmitted on the unlicensed frequency band in the related art is solved.

Optionally, the allocation result includes: in the case of the resource block identification and the first control information, the second sending module 56 is configured to: and D2D data is sent on the unlicensed frequency band resources corresponding to the resource block identifiers according to the indication of the first control information.

Optionally, the allocation result includes: in the case of resource block identification, the second sending module 56 is configured to: and transmitting third control information and D2D data for controlling the transmission of the D2D data on the unlicensed frequency band resources corresponding to the resource block identifiers.

Optionally, the second sending module 56 is configured to: 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 in case the second CCA detection is successful, transmitting D2D data on the dedicated slot resource block.

Optionally, the device is further configured to: after the second CCA detection is carried out on the special time slot resource block corresponding to the resource block identifier on the allocated special time slot, under the condition that the second CCA detection fails, a third CCA detection with preset priority is carried out on the standby time slot resource block corresponding to the resource block identifier on the allocated standby time slot; under the condition that the third CCA detection fails, carrying out third CCA detection of preset priority on the standby time slot resource block after waiting for preset time length; or, in case the third CCA detection is successful, the source device transmits D2D data on the spare time slot resource block.

Optionally, the device is further configured to: and after the third CCA detection of the preset priority is carried out on the spare time slot resource block corresponding to the resource block identification on the allocated spare time slot, when the source equipment does not complete the transmission of the D2D data on the spare time slot resource block, the transmission of the D2D data is completed on the shared time slot.

In this embodiment, there is further provided another data transmission apparatus, and fig. 6 is a block diagram of the structure of another data transmission apparatus according to an embodiment of the present invention, as shown in fig. 6, the apparatus includes:

a third receiving module 62, 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 device-to-device D2D data on an unlicensed frequency band;

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

Alternatively, the above-mentioned data transmission apparatus may be applied to, but not limited to, devices for transmitting D2D data, such as: destination device transmitting D2D data.

By the device, the third receiving module receives the distribution result of the unlicensed frequency band resources issued by the base station or third control information for controlling the transmission of the device-to-device (D2D) data on the unlicensed frequency band; the fourth receiving module receives the D2D data on the unlicensed frequency band according to the allocation result or the third control information, so that it can be seen that the D2D data is received on the unlicensed frequency band according to the allocation result of the base station for the resources of the unlicensed frequency band allocated to the D2D data between the source device and the destination device or the third control information received for controlling the transmission of the D2D data from the device to the device on the unlicensed frequency band, thereby realizing the transmission of the D2D data on the unlicensed frequency band, and solving the problem that the D2D data cannot be transmitted on the unlicensed frequency band in the related art.

Optionally, the fourth receiving module 64 is configured to: D2D data is detected and received on the unlicensed frequency band resource blocks indicated by the allocation result.

Optionally, the fourth receiving module 64 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.

It should be noted that each of the above modules may be implemented by software or hardware, and for the latter, it may be implemented by, but not limited to: the modules are all located in the same processor; alternatively, the modules are located in a plurality of processors, respectively.

Example 3

In this embodiment, there is provided a data transmission system including: a base station, a source device and a destination device, wherein,

the base station is used for receiving data transmission requests reported by one or more source devices, wherein the data transmission requests are used for requesting the base station to transmit device-to-device (D2D) data between the source devices and the destination devices; 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; issuing an allocation result, wherein the source device and/or the destination device transmits D2D data on an unlicensed frequency band according to the allocation result;

the source equipment is used for sending a data transmission request to the base station; receiving an allocation result of unlicensed frequency band resources issued by a base station; D2D data is sent to the target equipment on the unlicensed frequency band according to the allocation result;

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

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

Optionally, in the case that the base station is configured to issue an allocation result to one or more source devices and destination devices corresponding to the one or more source devices, the allocation result includes: 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 an allocation result to one or more source devices, the allocation result includes: and allocating a resource block identifier of 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.

Optionally, 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, D2D data is sent on the unlicensed frequency band resource corresponding to the resource block identifier according to the indication of the first control information.

Optionally, 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 D2D data for controlling the transmission of the D2D data on the unlicensed frequency band are sent on the unlicensed frequency band resources corresponding to the resource block identifier.

Optionally, the destination device is configured to: D2D data is detected and received on the unlicensed frequency band resource blocks indicated by the allocation result.

The following detailed description is of alternative embodiments of the invention.

Based on the auxiliary authorized spectrum access (License Assisted Access, abbreviated as LAA) technology, the alternative embodiment of the invention provides a resource allocation method for D2D communication, so as to reduce the problem of high load of an LTE base station and improve the resource utilization rate of the D2D communication on an unlicensed frequency band. Therefore, the present alternative embodiment focuses on the resource allocation method of D2D communication in the unlicensed band, and considers the resource utilization situations under different situations (for example, the first access success and the first access failure), so as to implement the following functions:

1) The base station performs resource pre-allocation according to the reporting condition of the D2D UE, and 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) And the different D2D UE performs related data transmission by using the unlicensed frequency band according to the resource allocation result of the base station. And if the CCA detection is successful, the UE directly accesses to the corresponding special time slot, and if the CCA fails, the UE is shifted to the standby time slot or the shared time slot to transmit data.

3) The D2D communication frame is divided into a dedicated slot (dedicated slot), a spare slot (shared slot), and a shared slot (shared slot): the communication resource corresponding to the special time slot is distributed by the base station according to the information reported by the UE; the standby time slot is pre-allocated by the base station according to the UE reporting the transmission requirement, the corresponding UE only has the priority access right and does not necessarily need to access to the corresponding resource, and other UEs can also perform competitive access to the resource; the communication resources sharing the time slot are accessed by adopting a random contention back-off mode, so that the possibility of collision among different D2D UEs is reduced. The allocation mode can reduce resource waste and improve resource utilization rate.

The alternative embodiment provides a resource allocation method aiming at high resource utilization rate of D2D communication on an unlicensed frequency band. Based on the FBE frame structure proposed by the LAA, the macro control and the pre-allocation of resources are performed by utilizing the base station according to the characteristics of the D2D communication, and the problem of how to reduce the resource waste under various conditions (CCA success performed by the UE and CCA failure performed by the UE) is solved by dividing the communication frame into a dedicated time slot (dedicated slot), a standby time slot (spare slot) and a shared time slot (shared slot). The specific slot allocation method may be determined by the data volume and traffic type of the D2D UE.

This alternative embodiment provides two examples: D2D UE reports and time slot resource allocation examples and D2D efficient data transmission examples.

In the example of D2D UE and base station resource allocation, communication between D2D UEs on unlicensed bands is mainly aimed at in LAA scenario.

Although the D2D communication corresponding to the present example is performed on an unlicensed frequency band, control and corresponding resource allocation may be performed by the base station, and the process of controlling and corresponding resource allocation may be performed on an licensed frequency band.

In a certain time window range, the D2D UE generating the service transmission requirement can report a data transmission request to the base station, and the base station performs pre-allocation of resources according to the service classification and the data quantity carried in the data transmission request reported by the summarized UE and issues the same random seed to the D2D UE corresponding to the receiving and transmitting end. The resource allocation method provided in this example may include the steps of:

step 11, the ue reports a data transmission request: the D2D UE informs the base station itself of an uplink scheduling request to be transmitted through a scheduling request (Scheduling Request, simply referred to as SR) on the PUCCH, requesting the base station eNodeB to allocate uplink resources thereto. Fig. 7 is a schematic diagram of an instruction for a UE to transmit control information according to an alternative embodiment of the present invention, and as shown in fig. 7, the corresponding UE reports control information required for data transmission, such as a data source device ID, a data destination device ID, a service type, a data amount, a priority, etc., to a base station.

Step 12, the base station performs resource allocation of the unlicensed frequency band: and the base station allocates resources according to the reporting result of the D2D UE. Fig. 8 is a schematic diagram of resource allocation by a base station according to an alternative embodiment of the present invention, as shown in fig. 8, in this example, the time slots of a communication frame on an unlicensed band are divided into three types: dedicated slots, spare slots, and shared slots. And the base station determines the proportion of the three time slots according to the information reported by the UE, so that D2D communication is ensured to be transmitted on the special time slots as much as possible. Wherein, the resources on the dedicated time slot can be completely allocated by the base station, and the minimum granularity of the resource allocation can be MRB (Mini Resource Block). For example: one MRB contains 14 OFDM symbols in the time domain, which is two slots in size, i.e., 1ms; the frequency domain contains 12 consecutive sub-carriers with a size of 180kHz. Considering the situation of CCA failure possibly occurring in the transmission process, for the standby time slot, the base station performs resource pre-allocation according to the reporting sequence of the D2D UE, but the allocated resources in the actual transmission process are still possibly occupied by other UEs. And the base station does not allocate the resources of the shared time slot.

Step 13, the base station issues the resource allocation result: the base station may transmit downlink scheduling information to the UE mainly by the PDCCH according to protocols 36.212 and 36.213. Fig. 9 is a schematic diagram of a DCI format according to an alternative embodiment of the present invention, as shown in fig. 9, each PDCCH can only carry DCI of a certain format, i.e. one PDCCH corresponds to a specific UE, and considering whether there are remaining bits in the current PDCCH, the form of the DCI may be extended to carry the corresponding base station allocation result.

In the data transmission example based on the base station allocation result, in the LAA scenario, in order to avoid interference with Wi-Fi signals or other LAA signals, a listen before talk (Listen Before Talk, abbreviated as LBT) manner is generally adopted, and a corresponding frame structure is shown that, before actually transmitting data, there is a clear channel assessment (Clear Channel Assessment, abbreviated as CCA) in the corresponding frame structure.

The basic form of the frame structure adopted in this example is frame-based setting (FBE), this example aims to avoid resource waste and improve resource utilization, mainly consider the data transmission process in two cases of success of first access CCA by UE and failure of first access CCA by UE, fig. 10 is a flowchart of data transmission by UE according to an alternative embodiment of the present invention, and as shown in fig. 10, the flowchart includes the following processes:

before the D2D communication is performed in the unlicensed frequency band, the holding of the frequency band is first confirmed by the CCA, and at this time, the CCA detection is completed by the base station. After the base station confirms the holding of the channel, the corresponding D2D UE performs CCA again before D2D data interaction to ensure the occupation of the channel. The CCA end positions corresponding to the same slot should be the same, i.e. the start of the valid data transmission should be the same.

In the special time slot, each UE performs data transmission according to the arbitration result of the base station, and first performs CCA detection before transmission. Assume that there are UE1 and UE2, where UE1 is a transmitting end and UE2 is a receiving end, and the base station allocates the same MRB number for UE1 and UE 2. If the UE1 fails to perform CCA in the dedicated slot, indicating that the allocated resources are occupied by other services, the corresponding data is transferred to the standby slot for transmission, and the UE2 can access the corresponding resources by using the same MRB number.

In the spare time slot, the base station has primarily allocated resources by allocating MRB numbers to D2D pairs, taking into account the possible CCA failure that may occur in the dedicated time slot. Although the base station performs pre-allocation of resources in advance, burst data generated during transmission can also be transmitted through resources occupying spare time slots. In order to ensure that the D2D UE which fails to complete data interaction in the special time slot occupies resources as far as possible, the D2D UE uses CCA detection with higher priority in the standby time slot so as to improve the preemption probability of the D2D UE. By the design, the D2D UE which does not complete data transmission in the special time slot can access the channel more easily to perform corresponding resource transmission.

In the shared time slot, the D2D UE which fails to complete data interaction in the special time slot and the standby time slot can complete data transmission through the D2D existing access mode. For example, UE1 is used as a transmitting end and UE2 is used as a receiving end, before data transmission, UE1 will send a control signaling containing ID identifier to UE2, after receiving demodulation, UE2 can determine whether the data source is correct, if so, the subsequent data is received; if not, the UE2 refuses to receive the subsequent data.

Furthermore, if the energy detected by the base station after n CCA passes is less than the threshold, the channel is considered to be occupiable and the data has completed the interaction. The base station may choose to reclaim the channel for the next round of data transmission.

According to different manners of allocating resources by the base station, the present example also provides another method for D2D data interaction in an unlicensed band. Fig. 11 is a flowchart of another UE transmitting data according to an alternative embodiment of the present invention, as shown in fig. 11, the flowchart includes the following steps:

in step S1102, the D2D UE reports a transmission request. The D2D UE informs the base station itself of an uplink scheduling request to be transmitted on PUCCH through SR (Scheduling Request, SR), requesting the eNodeB to allocate uplink resources for it. And then, the corresponding UE reports control information of data transmission such as a data source device ID, a data destination device ID, a service type, a data volume, a priority and the like to the base station on the uplink resources allocated by the base station. (method same as Step 1 in 2.2.1)

In step S1104, the base station allocates only the subframes for transmission to the D2D UE according to the reporting result, and the specific resource allocation situation is determined by the D2D UE. And the base station distribution result is issued.

Step S1106, detect whether the channel is idle, and if it is detected that the channel is idle, execute step S1108.

In step S1108, the D2D UE transmits corresponding control information in the D2D control domain, including information such as MRB resource, transmission type, reference Signal (Reference Signal) of data transmission, and the like. Considering that the D2D UE may have CCA failure on the allocated resources, it is also necessary to specify candidate resources for data transmission in the control domain, so as to ensure that the corresponding data transmission can be completed.

In step S1110, the D2D UE completes corresponding data transmission according to the control information on the control domain. The D2D UE performs CCA detection before each transmission to ensure possession of the channel. Meanwhile, the end positions of CCA of the D2D UE occupying different frequency bands on the same time slot are the same, namely the starting positions of effective data transmission are consistent.

In summary, 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 a dedicated time slot, a standby time slot and a shared time slot, where the dedicated time slot is allocated by the base station to perform fixed resource allocation for the data transmission of the reported UE, and the resource utilization rate is high, so that collision does not occur. Secondly, the design of the standby time slot can solve the problem of how to quickly access the corresponding data to other available resources under the condition of CCA failure, and because the CCA set by the UE corresponding to the CCA failure data is shorter, the higher channel use priority can be obtained, and the complete transmission of the corresponding data service is ensured. When the standby resource is not occupied by the data transmission retransmitted after the CCA failure, the standby resource can be used by other D2D UE with burst data in a competitive access mode, so that the waste of the resource is avoided, and the resource utilization rate is improved.

The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and those skilled in the art may modify or substitute the technical solution of the present invention without departing from the spirit and scope of the present invention, and the protection scope of the present invention shall be subject to the claims.

Example 4

From the description of the above embodiments, it will be clear to a person skilled in the art that the method according to the above embodiments may be implemented by means of software plus the necessary general hardware platform, but of course also by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, or a network device, etc.) to perform the method according to the embodiments of the present invention.

The embodiment of the invention also provides a storage medium. Alternatively, in the present embodiment, the above-described storage medium may be configured to store program code for performing the steps of:

S11, 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;

s12, 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 S13, issuing an allocation result, wherein the source equipment and/or the destination equipment transmit D2D data on an unlicensed frequency band according to the allocation result.

Optionally, the storage medium is further configured to store program code for performing the method steps recited in the above embodiments:

s21, sending 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;

s22, receiving an allocation result of the unlicensed frequency band resources issued by the base station;

s23, D2D data is sent to the destination device on the unlicensed frequency band according to the allocation result.

Alternatively, in the present embodiment, the storage medium may include, but is not limited to: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.

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

Alternatively, specific examples in this embodiment may refer to examples described in the foregoing embodiments and optional implementations, and this embodiment is not described herein.

It will be appreciated by those skilled in the art that the modules or steps of the invention described above may be implemented in a general purpose computing device, they may be concentrated on a single computing device, or distributed across a network of computing devices, they may alternatively be implemented in program code executable by computing devices, so that they may be stored in a memory device for execution by computing devices, and in some cases, the steps shown or described may be performed in a different order than that shown or described, or they may be separately fabricated into individual integrated circuit modules, or multiple modules or steps within them may be fabricated into a single integrated circuit module for implementation. Thus, the present invention is not limited to any specific combination of hardware and software.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

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;

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;

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;

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 alternatively, the process may be performed,

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;

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

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;

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

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

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;

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

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:

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

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

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