WO2017024546A1

WO2017024546A1 - Data transmission method and apparatus

Info

Publication number: WO2017024546A1
Application number: PCT/CN2015/086736
Authority: WO
Inventors: 张力学; 肖潇
Original assignee: 华为技术有限公司
Priority date: 2015-08-12
Filing date: 2015-08-12
Publication date: 2017-02-16
Also published as: CN107211405A; CN107211405B

Abstract

Disclosed are a data transmission method and an apparatus therefor. The data transmission method comprises: a terminal device establishing a mapping relationship between a D2D service logic channel and a D2D Discovery transmission channel; the terminal device determining whether the number of bits of first D2D communication data reaches a threshold value, wherein the first D2D communication data is D2D communication data to be transmitted; when the first D2D communication data does not reach the threshold value, the terminal device mapping the first D2D communication data to the D2D Discovery transmission channel according to the mapping relationship; and the terminal device transmitting the first D2D communication data via the D2D Discovery transmission channel. By means of the method, the transmission efficiency of a data channel can be improved, and the overall resource utilization rate of an LTE network is improved.

Description

Data transmission method and device

【技术领域】[Technical Field]

The present application relates to the field of communication networks, and in particular, to a data transmission method and apparatus.

【背景技术】【Background technique】

Device to device (Device The communication technology of toDevice, D2D) is a technology that allows direct communication between user equipment devices (User Equipments, UEs) using a wireless link under the control of a cellular system.

Currently based on long-term evolution (Long Term Evolution, LTE) mode of direct communication of user terminal equipment through D2D includes: through the discovery channel transmission mode (commonly referred to as D2D) Discovery mode), through the D2D data channel transmission mode (commonly referred to as D2D direct communication mode). The LTE system allocates D2D through broadcast messages or dedicated signaling. The transmission resources that Discovery and D2D communicate directly to the user perform D2D communication in the corresponding mode.

However, in current D2D communication based on LTE, D2D communication data can only be mapped to the D2D shared transmission channel, and the D2D communication data cannot be mapped to the Discovery transmission channel, and thus the D2D communication data with a small number of bits can not be transmitted through the Discovery channel, which will be reduced. Transmission efficiency of the D2D data channel.

【发明内容】 [Summary of the Invention]

The technical problem to be solved by the present application is to provide a data transmission method and device, which can improve the transmission efficiency of the data channel and improve the overall resource utilization of the LTE network.

In order to solve the above problem, the first aspect of the present application provides a data transmission method, including: establishing, by a terminal device, a D2D service logical channel and a D2D a mapping relationship of the Discovery transport channel; the terminal device determines whether the number of bits of the first D2D communication data reaches a threshold value, wherein the first D2D communication data is D2D communication data to be transmitted; when the first D2D communication When the data does not reach the threshold, the terminal device maps the first D2D communication data to the D2D according to the mapping relationship. a Discovery transport channel; the terminal device transmits the first D2D communication data through the D2D Discovery transport channel.

In order to solve the above problem, the second aspect of the present application provides a data transmission method, including: receiving, by a terminal device, D2D communication data sent by another terminal device other than the terminal device;

Determining, by the terminal device, that the D2D communication data is from D2D according to the information of the D2D communication data a discovery channel; the terminal device according to the information of the D2D communication data and the D2D service logical channel and the D2D acquired by the terminal device A mapping relationship of the Discovery transport channel, mapping the D2D communication data to the D2D Discovery transport channel.

In order to solve the above problem, a third aspect of the present application provides a data transmission apparatus, including: an establishment module, a determination module, a mapping module, and a transmission module; the establishment module is configured to establish a D2D service logical channel and a D2D a mapping relationship of the Discovery transmission channel; the determining module is configured to determine whether the number of bits of the first D2D communication data reaches a threshold value, wherein the first D2D communication data is D2D communication data to be transmitted; When the determining module determines that the first D2D communication data does not reach the threshold, mapping the first D2D communication data to the D2D according to the mapping relationship established by the establishing module. a discovery channel; the transmission module is configured to transmit the first D2D communication data by using the D2D Discovery transmission channel.

In order to solve the above problem, a fourth aspect of the present application provides a data transmission apparatus, including a receiving module, a determining module, and a mapping module, where the receiving module is configured to receive D2D communication data sent by other terminal devices; Determining, according to the information of the D2D communication data received by the receiving module, that the D2D communication data is from D2D a discovery channel; the mapping module is configured to: when the determining module determines that the D2D communication data is from D2D When the Discovery transport channel is based on the information of the D2D communication data and the acquired D2D service logical channel and D2D A mapping relationship of the Discovery transport channel, mapping the D2D communication data to the D2D Discovery transport channel.

In order to solve the above problem, a fifth aspect of the present application provides a data transmission apparatus, including a processor and a transceiver; the processor is configured to establish a D2D service logical channel and a D2D a mapping relationship of the Discovery transmission channel; the processor is configured to determine whether a number of bits of the first D2D communication data reaches a threshold value, wherein the first D2D communication data is D2D communication data to be transmitted; Determining, when the first D2D communication data does not reach the threshold, mapping the first D2D communication data to the D2D according to the mapping relationship Discovery transmits a channel and transmits the first D2D communication data through the D2D Discovery transmission channel; the transceiver is configured to transmit and receive data.

In order to solve the above problems, a sixth aspect of the present application provides a data transmission apparatus including a transceiver and a processor; the transceiver is configured to receive D2D communication data sent by another terminal device; and the processor is configured to perform communication according to the D2D The information of the data determines that the D2D communication data is from D2D Discovery transport channel; and for when the D2D communication data comes from D2D When the Discovery transport channel is based on the information of the D2D communication data and the acquired D2D service logical channel and D2D A mapping relationship of the Discovery transport channel, mapping the D2D communication data to the D2D Discovery transport channel.

In the above solution, the terminal device establishes a D2D service logical channel and D2D a mapping relationship of the Discovery transmission channel, when determining that the first D2D communication data does not reach the threshold, mapping the first D2D communication data to the D2D Discovery transmission channel, and passing the D2D The Discovery transmission channel transmits the first D2D communication data, which solves the problem that the prior art cannot pass the D2D. The technical problem that the Discovery transmission channel carries D2D communication data can improve the transmission efficiency of the data channel and improve the overall resource utilization of the LTE network.

【附图说明】 [Description of the Drawings]

1 is a flow chart of an embodiment of a data transmission method of the present application;

2 is a flow chart of another embodiment of a data transmission method of the present application;

3 is a schematic diagram of an embodiment of establishing a mapping relationship between a D2D service logical channel and a D2D Discovery transmission channel in the present application;

4 is a schematic diagram of channel mapping of D2D communication based on LTE according to the present application;

5 is a schematic diagram of an embodiment of transmitting a Discovery message and D2D communication data by using different physical resources in the present application;

6 is a flowchart of still another embodiment of a data transmission method of the present application;

7 is a schematic diagram of another embodiment of establishing a mapping relationship between a D2D service logical channel and a D2D Discovery transmission channel according to the present application;

8 is a flowchart of still another embodiment of a data transmission method of the present application;

9 is a schematic diagram of still another embodiment of establishing a mapping relationship between a D2D service logical channel and a D2D Discovery transmission channel according to the present application;

10 is a flowchart of still another embodiment of a data transmission method of the present application;

11 is a schematic structural diagram of an embodiment of a data transmission device of the present application;

12 is a schematic structural diagram of another embodiment of a data transmission apparatus of the present application;

FIG. 13 is a schematic structural diagram of still another embodiment of a data transmission apparatus according to the present application; FIG.

14 is a schematic structural diagram of still another embodiment of a data transmission device of the present application;

15 is a schematic structural diagram of still another embodiment of a data transmission device of the present application;

FIG. 16 is a schematic structural diagram of still another embodiment of a data transmission apparatus of the present application.

【具体实施方式】【detailed description】

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In the following description, for purposes of illustration and description, reference

Referring to FIG. 1, FIG. 1 is a flowchart of an embodiment of a data transmission method of the present application. The execution entity of this embodiment is a terminal device, and the terminal device is a user terminal device (User Equipment, UE), wherein the UE may be a mobile terminal device such as a mobile phone. Two UEs can communicate directly to transmit data. The data transmission method of this embodiment includes the following steps:

S101: The terminal device establishes a mapping relationship between the D2D service logical channel and the D2D Discovery transmission channel.

Terminal equipment establishes D2D traffic channel (Sidelink Traffic Channel, STCH) and D2D The mapping relationship of the Discovery transport channel.

Wherein, the D2D service logical channel is a media access control protocol in the protocol stack of the D2D direct communication mode (Media Access) Control, MAC) layer and the communication layer of each layer above the MAC layer, D2D Discovery transmission channel is D2D The communication interface between the MAC layer and the physical (PHY) layer in the protocol stack of the Discovery mode.

The architecture of the protocol stack of D2D direct communication mode (from top to bottom) includes: Packet Data Convergence Protocol (Packet Data) Convergence Protocol (PDCP) layer, Radio Link Control (RLC) layer, MAC layer, PHY layer.

D2D The architecture of the Discovery mode protocol stack (from top to bottom) includes: ProSe protocol stack, MAC layer, and PHY layer.

The D2D service logical channel may be located at the MAC layer, or may be located at the RLC layer, or may be located at the PDCP layer, but is not limited thereto, and is not limited herein.

The terminal device can directly establish a D2D service logical channel and D2D at the MAC layer. The mapping relationship of the Discovery transport channel; a mapping interface may also be established between the RLC layer and the ProSe protocol stack to establish a D2D service logical channel to the D2D through the RLC layer and the ProSe protocol stack. The mapping relationship of the Discovery transport channel; the mapping relationship with the ProSe protocol stack can also be established at the PDCP layer to establish a D2D service logical channel and D2D. The mapping relationship of the Discovery transport channel.

Of course, D2D service logical channels and D2D can also be established in other ways. The mapping relationship of the Discovery transport channel is not limited here.

When the terminal device sends the Discovery message generated by the ProSe protocol stack, the terminal device processes according to the processing method in the prior art: the terminal device delivers the Discovery message to be sent to the MAC layer, and the MAC layer is responsible for mapping the Discovery message to the MAC layer. Corresponding D2D Discovery Transport Channel (Sidelink Discovery Channel, SL-DCH), via D2D The Discovery transport channel delivers Discovery messages to the PHY layer, which uses the Discovery transport resources in the physical layer to transport Discovery messages.

When the terminal device transmits the D2D communication data, steps S102 to S103 are performed.

The D2D communication data includes audio data, video data, and the like, and the D2D communication data is generated by the application layer, and after processing, enters a protocol stack of the D2D direct communication mode for processing.

S102: The terminal device determines whether the number of bits of the first D2D communication data reaches a threshold value, wherein the first D2D communication data is D2D communication data to be transmitted.

When the terminal device communicates with other terminal devices and transmits D2D communication data to other terminal devices, the terminal device determines whether the number of bits of the first D2D communication data to be transmitted reaches a threshold value.

The threshold value may be a threshold corresponding to the number of bits of the preset D2D communication data, and the specific numerical value may be set according to actual needs.

Due to D2D The Discovery transport channel can only transmit packets that are less than or equal to a fixed number of bits, and cannot transmit packets larger than a fixed number of bits. Therefore, the threshold can be set to be less than or equal to D2D. The maximum number of bits carried by the Discovery transport channel. The threshold corresponding to the number of bits of D2D communication data does not exceed D2D The maximum number of bearers of the Discovery transport channel may be 232 bits, but is not limited thereto, and may be set to other values, which is not limited herein.

When the number of bits of the first D2D communication data is less than or equal to the threshold value, it is determined that the first D2D communication data does not reach the threshold value, and step S103 is performed.

When the number of bits of the first D2D communication data is greater than the threshold, it is determined that the first D2D communication data exceeds the threshold, and the first D2D communication data is mapped to the D2D sharing according to the process of processing the D2D data in the prior art. Transport channel (Sidelink Shared Channel, SL-SCH) is processed.

S103: when the first D2D communication data does not reach the threshold, the terminal device maps the first D2D communication data to the D2D according to the mapping relationship. Discovery transport channel.

When the terminal device determines that the first D2D communication data is less than or equal to the threshold, the terminal device according to the D2D service logical channel and the D2D A mapping relationship of the Discovery transport channel, mapping the first D2D communication data to the D2D Discovery transport channel.

Wherein, when the terminal device directly establishes a D2D service logical channel and D2D in the MAC layer of the medium access control protocol When the mapping relationship of the Discovery transmission channel is performed, the terminal device submits the first D2D communication data to the MAC layer, according to the D2D service logical channel and the D2D. The mapping of the Discovery transport channel maps the first D2D communication data to the D2D Discovery transport channel at the MAC layer.

Establishing a D2D service logical channel and D2D when the terminal device establishes a mapping relationship with the ProSe protocol stack at the PDCP layer. When the mapping relationship of the Discovery transmission channel: the first D2D communication data enters the protocol stack of the D2D direct communication mode from the application layer. After the first communication data arrives at the PDCP layer, the terminal device maps the first D2D communication data from the PDCP layer to the ProSe protocol stack according to the mapping relationship between the PDCP layer and the ProSe protocol stack, and the first D2D communication data enters the D2DDiscovery mode protocol. Stack. After the terminal device delivers the first D2D communication data to the MAC layer, mapping the first D2D communication data to the D2D at the MAC layer Discovery transport channel.

When the terminal device establishes a mapping interface between the RLC layer and the ProSe protocol stack, the D2D service logical channel is established to the D2D. When the mapping relationship of the Discovery transmission channel: the first D2D communication data enters the protocol stack of the D2D direct communication mode from the application layer. After the first communication data reaches the RLC layer through the PDCP layer, the terminal device maps the first D2D communication data from the RLC layer to the ProSe protocol stack through the mapping interface between the RLC layer and the ProSe protocol stack, and the first D2D communication data enters the D2DDiscovery The protocol stack of the pattern. After the terminal device delivers the first D2D communication data to the MAC layer, mapping the first D2D communication data to the D2D at the MAC layer Discovery transport channel.

When the terminal device directly establishes a D2D service logical channel and D2D at the MAC layer When the mapping relationship of the Discovery transmission channel is: the terminal device enters the protocol stack of the D2D direct communication mode from the application layer in the first D2D communication data, and passes the first D2D communication data to the MAC layer after passing through the PDCP layer and the RLC layer from the RLC layer. At the MAC layer according to the D2D service logical channel and D2D The mapping relationship of the Discovery transport channel directly maps the first D2D communication data to the D2D Discovery transport channel.

S104: The terminal device delivers the first D2D communication data to the physical layer by using a D2D Discovery transmission channel.

After the terminal device maps the first D2D communication data to the D2D Discovery transmission channel, through the D2D The Discovery transport channel passes the first D2D communication data from the MAC layer to the physical layer, and then passes the D2D. The transmission resource corresponding to Discovery transmits the first D2D communication data, thereby transmitting the first D2D communication data to other terminal devices.

It can be understood that the terminal device receives the data and sends the data in two reverse processes. For the process of the terminal device processing the received data, refer to the foregoing process, which is not described here.

Please refer to FIG. 2. FIG. 2 is a flowchart of another embodiment of the data transmission method of the present application. The execution entity of this embodiment is a terminal device, and the terminal device is a user terminal device (User Equipment, UE), wherein the UE may be a mobile terminal device such as a mobile phone. Two UEs can communicate directly to transmit data. The data transmission method of this embodiment includes the following steps:

S201: The terminal device directly establishes a D2D service logical channel and D2D at a medium access control protocol layer The mapping relationship of the Discovery transport channel.

Please refer to FIG. 3 and FIG. 4 together. FIG. 3 is a schematic diagram of establishing a D2D service logical channel and D2D in the present application. Schematic diagram of an embodiment of a mapping relationship of Discovery transport channels. Figure 3-1 shows the establishment of the D2D service logical channel and D2D in this application. Schematic diagram of an implementation manner of a mapping relationship of a Discovery transmission channel, and FIG. 3-2 is a logical channel and D2D for establishing a D2D service in the present application. Schematic diagram of another embodiment of a mapping relationship of Discovery transport channels. 4 is a schematic diagram of channel mapping of D2D communication based on LTE in the present application. The D2D service logical channel STCH is located at the MAC layer, the D2D service logical channel STCH is the communication interface of the MAC layer and the layers above the MAC layer in the protocol stack of the D2D direct communication mode, and the D2D shared transport channel SL-SCH is the D2D direct communication mode. Communication interface between the MAC layer and the physical layer in the protocol stack, D2D The Discovery transport channel SL-DCH is a communication interface between the MAC layer and the physical layer in the protocol stack of the D2D Discovery mode.

As shown in FIG. 3, the terminal device directly establishes a D2D service logical channel and D2D at the MAC layer. Discovery transport channel SL-DCH mapping relationship.

When the terminal device sends the Discovery message generated by the ProSe protocol stack, the processing is performed according to the processing flow in the prior art, and details are not described herein.

When the terminal device sends the D2D communication data, step S202~S204 or step S202~ S203 and S205~S208.

The D2D communication data includes audio data, video data, and the like. The D2D communication data is generated by the application layer, and after being processed by the TCP/UDP layer and the IP layer, the D2D direct communication mode protocol stack is processed. When establishing the D2D service logical channel and D2D as shown in Figure 3-1 When the mapping relationship of the Discovery transmission channel SL-DCH is performed, steps S202 to S204 are performed; when the D2D service logical channel and the D2D are established by the manner as shown in FIG. 3-2. When the mapping relationship of the Discovery transmission channel SL-DCH is performed, steps S202 to S203 and S205 to S208 are executed.

S202: The terminal device determines whether the number of bits of the first D2D communication data is less than or equal to a first preset threshold; wherein the first preset threshold is less than or equal to the D2D The maximum number of bits carried by the Discovery transport channel.

When the terminal device needs to send the first D2D communication data, after the first D2D communication data is delivered from the application layer to the TCP/UDP layer and the IP layer for processing, the terminal device delivers the first D2D communication data to the D2D direct communication mode. The protocol stack is processed. After the first D2D communication data enters the protocol stack of the D2D direct communication mode, the terminal device determines whether the number of bits of the first D2D communication data is less than or equal to a first preset threshold. Wherein, the first preset threshold is not greater than D2D The maximum number of bits carried by the Discovery transport channel. The first preset threshold may be 232 bits, but is not limited thereto, and may be other values, which are not limited herein.

When the number of bits of the first D2D communication data is less than or equal to the first preset threshold, step S203 is performed.

When the number of bits of the first D2D communication data is greater than the first preset threshold, step S204 or S205 is performed. Wherein, in step S201, the D2D service logical channel and the D2D are established by the manner as shown in FIG. 3-1. When the mapping relationship of the Discovery transmission channel SL-DCH is performed, step S204 is performed; in step S201, the D2D service logical channel and the D2D are established by the manner as shown in FIG. 3-2. When the mapping relationship of the Discovery transport channel SL-DCH is performed, step S205 is performed.

S203: when the number of bits of the first D2D communication data is less than or equal to the first preset threshold, the terminal device maps the first D2D communication data to the at the medium access control protocol layer. D2D a Discovery transport channel that transmits the first D2D communication data over the D2D Discovery transport channel.

When the terminal device determines that the number of bits of the first D2D communication data is less than or equal to the first preset threshold, after the first D2D communication data is processed by the PDCP layer and the RLC layer, the first D2D communication data is delivered to the MAC layer. The processing method of the first D2D communication data in the PDCP layer and the RLC layer is the same as that in the prior art, and details are not described herein.

The terminal device according to the D2D service logical channel and D2D in the MAC layer The mapping relationship of the Discovery transport channel, mapping the first D2D communication data to the D2D Discovery transport channel at the MAC layer to pass the D2D The Discovery transport channel delivers the first D2D communication data from the MAC layer to the physical layer. When the first D2D communication data is delivered to the physical layer, through D2D The transmission resource corresponding to Discovery transmits the first D2D communication data, thereby transmitting the first D2D communication data to other terminal devices.

S204: when the number of bits of the first D2D communication data is greater than the first preset threshold, the terminal device maps the first D2D communication data to a D2D shared transport channel, and transmits the data through the D2D shared transport channel. The first D2D communication data, wherein the first preset threshold is less than or equal to the D2D The maximum number of bits carried by the Discovery transport channel.

When the terminal device establishes the D2D service logical channel and the D2D in the manner shown in FIG. 3-1 in step S201. And discovering the mapping relationship between the Discovery transmission channel SL-DCH and determining that the number of bits of the first D2D communication data is greater than the first preset threshold, and processing the first D2D communication data to the first D2D communication data through the PDCP layer and the RLC layer to After the MAC layer, according to the D2D service logical channel and D2D in the MAC layer Sharing the mapping relationship of the transport channels, mapping the first D2D communication data to the D2D shared transport channel, and delivering the first D2D communication data from the MAC layer to the physical layer through the D2D shared transport channel. Wherein, the first preset threshold is less than or equal to D2D The maximum number of bits carried by the Discovery transport channel.

After the first D2D communication data is delivered to the physical layer, the first D2D communication data is transmitted through the transmission resource corresponding to the D2D communication data, thereby transmitting the first D2D communication data to other terminal devices.

S205: When the number of bits of the first D2D communication data is greater than the first preset threshold, the terminal device divides the first D2D communication data into at least a second D2D at the radio link control protocol layer. Communication data and third D2D communication data; wherein the first preset threshold is equal to the D2D The maximum number of bits carried by the Discovery transport channel, the number of bits of the second D2D communication data is less than or equal to the first preset threshold, and the number of bits of the third D2D communication data is greater than the number of bits of the second D2D communication data .

When the terminal device establishes the D2D service logical channel and the D2D in the manner shown in FIG. 3-2 in step S201. The discovery device transmits the mapping relationship of the channel SL-DCH, and determines that the number of bits of the first D2D communication data is greater than the first preset threshold, the terminal device processes the first D2D communication data through the PDCP layer, and processes the first D2D communication data from the first D2D communication data. The PDCP layer is submitted to the RLC layer. Thereafter, the terminal device divides the first D2D communication data into at least the second D2D communication data and the third D2D communication data at the RLC layer. The number of bits of the second D2D communication data is less than or equal to a first preset threshold, and the number of bits of the third D2D communication data is greater than the number of bits of the second D2D communication data.

S206: The terminal device determines whether the number of bits of the third D2D communication data is greater than a second preset threshold; wherein the second preset threshold is a maximum number of bits carried by the D2D shared transport channel.

After the terminal device divides the first D2D communication data into the second D2D communication data and the third D2D communication data at the RLC layer, it is further determined whether the third D2D communication data is greater than a second preset threshold. The second preset threshold is the maximum number of bits carried by the D2D shared transport channel.

When the number of bits of the third D2D communication data is greater than the second preset threshold, step S207 is performed; when the third D2D communication data is less than or equal to the second preset threshold, step S208 is performed.

S207: when the number of bits of the third D2D communication data is greater than a second preset threshold, the terminal device segments the third D2D communication data at the radio link control protocol layer, where the divided The number of bits of each D2D communication data is less than or equal to the second preset threshold, the second D2D communication data includes scheduling information of the third D2D communication data, and the scheduling information is used to indicate the third D2D Information on time-frequency resources used by communication data.

When the terminal device determines that the third D2D communication data is greater than the second preset threshold, the fourth D2D communication data is split again at the RLC layer.

The number of bits of each D2D communication data after the division is less than or equal to the second threshold, so that the D2D shared transmission channel can carry the divided D2D communication data. The second D2D communication data includes scheduling information of the third D2D communication data, and the scheduling information is used to indicate information of a time-frequency resource used by the third D2D communication data.

It can be understood that when the third D2D communication data is less than or equal to the second preset threshold, the second D2D communication data does not include the scheduling information of the third D2D communication data.

S208: Mapping the second D2D communication data to the D2D at the medium access control protocol layer a Discovery transport channel; and mapping the third D2D communication data to the D2D shared transport channel at the medium access control protocol layer.

When the third D2D communication data is less than or equal to the second threshold, the first D2D communication data is divided into the second D2D communication data and the third D2D communication data, and the second D2D communication data does not include the scheduling information of the third D2D communication data.

After the terminal device delivers the second D2D communication data and the third D2D communication data from the RLC layer to the MAC layer, according to the D2D service logical channel and the D2D in the MAC layer Mapping of Discovery transport channels, mapping second D2D communication data to D2D at the MAC layer a Discovery transport channel; and mapping the third D2D communication data to the D2D shared transport channel according to a mapping relationship between the D2D service logical channel and the D2D shared transport channel in the MAC layer.

Mapping third D2D communication data to D2D at the terminal device After the Discovery transport channel, the source address and the destination address are added to the second D2D communication data at the MAC layer, and the D2D is passed. The Discovery transport channel delivers the second D2D communication data from the MAC layer to the physical layer. The source address is used to identify the MAC address of the terminal device that sends the second D2D communication data, and the destination address is used to identify the MAC address of the terminal device that receives the second D2D communication data.

Optionally, mapping the second D2D communication data to the D2D at the terminal device After the Discovery transport channel, the terminal device may further add a dedicated logical channel identifier in the MAC data packet header of the second D2D communication data, where the dedicated logical channel identifier is used to identify the D2D. The D2D communication data transmitted by the Discovery transport channel, which may be one byte. The dedicated logical channel identifier facilitates the terminal device to distinguish D2D communication data by using D2D. Whether the Discovery transport channel is transmitted or transmitted through the D2D shared transport channel.

When the second D2D communication data is delivered to the physical layer, through the D2D The transmission resource corresponding to Discovery transmits the second D2D communication data, thereby transmitting the second D2D communication data to other terminal devices.

After the terminal device maps the third D2D communication data to the D2D shared transport channel, the terminal device adds a source address and a destination address to the third D2D communication data at the MAC layer, and sends the third D2D communication data from the MAC layer through the D2D shared transport channel. Submitted to the physical layer. The source address is used to identify the MAC address of the terminal device that sends the third D2D communication data, and the destination address is used to identify the MAC address of the terminal device that receives the third D2D communication data.

After the third D2D communication data is delivered to the physical layer, the third D2D communication data is transmitted through the transmission resource corresponding to the D2D communication data, thereby transmitting the third D2D communication data to the other terminal device. It can be understood that the second D2D communication data and the third D2D communication data can be simultaneously transmitted at this time.

When the third D2D communication data is greater than the second preset threshold, after the terminal device performs step S207, the first D2D communication data is divided into the second D2D communication data and the third D2D communication data, and the third D2D communication data is again Divided into at least two pieces of D2D communication data, the second D2D communication data includes scheduling information of the third D2D communication data.

After the terminal device delivers the second D2D communication data and the third D2D communication data from the RLC layer to the MAC layer, according to the D2D service logical channel and the D2D in the MAC layer The mapping relationship of the Discovery transport channel, mapping the second D2D communication data to the D2D Discovery transport channel at the MAC layer; and the D2D service logical channel and D2D according to the MAC layer The mapping relationship of the shared transport channel is mapped to each D2D communication data included in the third D2D communication data to the D2D shared transport channel.

After mapping the third D2D communication data to the D2D shared transport channel, the terminal device adds the source address and the destination address to the second D2D communication data at the MAC layer, and passes the D2D. The Discovery transport channel delivers the second D2D communication data from the MAC layer to the physical layer. The source address is used to identify the MAC address of the terminal device that sends the second D2D communication data, and the destination address is used to identify the MAC address of the terminal device that receives the second D2D communication data.

After mapping the D2D communication data included in the third D2D communication data to the D2D shared transmission channel, the terminal device adds a source address and a destination address to each D2D communication data included in the third D2D communication data at the MAC layer, and passes the D2D. The shared transport channel delivers the third D2D communication data from the MAC layer to the physical layer. The source address is used to respectively identify a MAC address of a terminal device that sends each D2D communication data included in the third D2D communication data, and the destination address is used to identify a terminal device that receives each D2D communication data included in the third D2D communication data. MAC address.

Please refer to FIG. 5. FIG. 5 is a schematic diagram of an embodiment of the present application for transmitting a Discovery message and D2D communication data by using different physical resources. When the second D2D communication data is delivered to the physical layer, through the D2D The transmission resource corresponding to Discovery transmits the second D2D communication data, thereby transmitting the second D2D communication data to other terminal devices. The second D2D communication data includes scheduling information of the third D2D communication data, the scheduling information being used to indicate information of a time-frequency resource used by the third D2D communication data.

After the third D2D communication data is delivered to the physical layer, the terminal device further acquires, according to the scheduling information of the third D2D communication data included in the second D2D communication data, the transmission resource corresponding to each D2D communication data in the third D2D communication data, and Each D2D communication data included in the third D2D communication data is separately transmitted through the transmission resource corresponding to each D2D communication data, thereby transmitting the third D2D communication data to other terminal devices.

It can be understood that the first D2D communication data in the second D2D communication data and the third D2D communication data may be simultaneously transmitted. Each D2D communication data included in the third D2D communication data is sequentially transmitted separately.

In the above solution, the terminal device directly establishes a D2D service logical channel and D2D at the MAC layer. The mapping relationship of the Discovery transmission channel, when determining that the first D2D communication data is less than or equal to the first preset threshold, mapping the first D2D communication data to the D2D Discovery transmission channel, and passing the D2D The Discovery transmission channel transmits the first D2D communication data, and transmits the D2D communication data through the D2D Discovery transmission resource, which solves the problem that the prior art cannot pass the D2D. The technical problem that the Discovery transmission channel carries D2D communication data can improve the transmission efficiency of the data channel and improve the overall resource utilization of the LTE network.

When the first D2D communication data is greater than the first preset threshold, the first D2D communication data is mapped to the D2D shared transmission channel, and the first D2D communication data is transmitted through the D2D shared transmission channel.

Further, when the first D2D communication data is greater than the first preset threshold, the first D2D communication may be further divided into the second D2D communication data and the third D2D communication data by using the D2D The Discovery transmission channel transmits the second D2D communication data, and transmits the first D2D communication data through the D2D shared transmission channel; when the third D2D communication data is greater than the second preset threshold, the third D2D communication data may also be scheduled by using the second D2D communication data. Transfer.

Please refer to FIG. 6. FIG. 6 is a flowchart of still another embodiment of the data transmission method of the present application. The execution entity of this embodiment is a terminal device, and the terminal device is a user terminal device (User Equipment, UE), wherein the UE may be a mobile terminal device such as a mobile phone. Two UEs can communicate directly to transmit data.

This embodiment establishes a D2D service logical channel and D2D with the previous embodiment. The method of discovering the mapping relationship of the Discovery channel is different. The difference between this embodiment and the previous embodiment is that steps S301, S303~S306, S308, and the method of adding the source address and the destination address are different in the previous embodiment. Wherein, in the previous embodiment, the terminal device maps the first D2D communication data to the D2D After the Discovery transport channel or the D2D shared transport channel, the source address, the destination address, and the dedicated logical channel identifier are added at the MAC layer. In this embodiment, the source address, the destination address, and the dedicated logic are added at the RLC layer before mapping the first D2D communication data. Channel identification.

The data transmission method of this embodiment includes the following steps:

S301: The terminal device sets a mapping interface between the radio link control protocol layer and the ProSe protocol stack, and establishes a D2D service logical channel and D2D. The mapping relationship of the Discovery transport channel.

Please refer to FIG. 7 together. FIG. 7 is a D2D service logical channel and D2D established in the present application. A schematic diagram of another embodiment of a mapping relationship of Discovery transport channels.

As shown in FIG. 7, the terminal device sets a mapping interface between the radio link control protocol layer and the ProSe protocol stack, and establishes a D2D service logical channel and D2D. The mapping relationship of the Discovery transport channel. The D2D service logical channel is in the RLC layer.

When the terminal device transmits the D2D communication data, steps S302 to S204 or steps S302 to S303 and S305 to S308 are performed.

The D2D communication data includes audio data, video data, and the like. The D2D communication data is generated by the application layer, and after being processed by the TCP/UDP layer and the IP layer, the D2D direct communication mode protocol stack is processed.

S302: The communication device determines whether the number of bits of the first D2D communication data is less than or equal to a first preset threshold; wherein the first preset threshold is less than or equal to the D2D The maximum number of bits carried by the Discovery transport channel.

The step S302 is the same as the step S202 in the previous embodiment. Please refer to the related description in step S202 in the previous embodiment, and details are not described herein.

When the terminal device determines that the number of bits of the first D2D communication data is less than or equal to the first preset threshold, performing step S303 is performed.

When the terminal device determines that the number of bits of the first D2D communication data is greater than the first preset threshold, step S304 or S305 is performed. Wherein, when the first preset threshold is less than or equal to D2D When the maximum number of bits carried by the Discovery transmission channel is performed, step S304 is performed, when the first preset threshold is equal to D2D. When the maximum number of bits carried by the Discovery transport channel is performed, step S305 is performed.

S303: When the number of bits of the first D2D communication data is less than or equal to the first preset threshold, submit the first D2D communication data to the ProSe protocol stack by using the mapping interface, where the media An access control protocol layer maps the first D2D communication data to the D2D Discovery transmits a channel and transmits the first D2D communication data through the D2D Discovery transmission channel.

When the terminal device determines that the number of bits of the first D2D communication data is less than or equal to the first preset threshold, the terminal device delivers the first D2D communication data from the PDCP layer processing to the RLC layer.

The terminal device adds a source address and a destination address to the first D2D communication data at the RLC layer. The source address is used to identify the MAC address of the terminal device that sends the first D2D communication data, and the destination address is used to identify the MAC address of the terminal device that receives the first D2D communication data.

Optionally, the terminal device may further add a dedicated logical channel identifier in the MAC data packet header of the first D2D communication data at the RLC layer, where the dedicated logical channel identifier is used to identify the D2D. The D2D communication data transmitted by the Discovery transport channel, which may be one byte. The dedicated logical channel identifier facilitates the terminal device to distinguish D2D communication data by using D2D. Whether the Discovery transport channel is transmitted or transmitted through the D2D shared transport channel.

Thereafter, the terminal device maps the first D2D communication data from the RLC layer to the ProSe protocol stack through a mapping interface between the RLC layer and the ProSe protocol stack. After the terminal device delivers the first D2D communication data from the ProSe protocol stack to the MAC layer, the terminal device according to the ProSe protocol stack and the D2D The mapping relationship of the Discovery transport channel, mapping the first D2D communication data to the D2D Discovery transport channel at the MAC layer, and passing the D2D The Discovery transport channel delivers the first D2D communication data to the physical layer.

When the first D2D communication data is delivered to the physical layer, through D2D The transmission resource corresponding to Discovery transmits the first D2D communication data, thereby transmitting the first D2D communication data to other terminal devices.

S304: when the number of bits of the first D2D communication data is greater than the first preset threshold, the terminal device maps the first D2D communication data to a D2D shared transport channel, and transmits the data through the D2D shared transport channel. The D2D communication data, wherein the first preset threshold is less than or equal to the D2D The maximum number of bits carried by the Discovery transport channel.

When the terminal device determines D2D When the Discovery transmission channel cannot carry the first D2D communication data that is greater than the first preset threshold, after the terminal device determines that the number of bits of the first D2D communication data is greater than the first preset threshold, the terminal device pairs the first D2D communication data at the RLC layer. Add source and destination addresses. Wherein, the first preset threshold is less than or equal to D2D The maximum number of bits carried by the Discovery transport channel. The source address is used to identify the MAC address of the terminal device that sends the first D2D communication data, and the destination address is used to identify the MAC address of the terminal device that receives the first D2D communication data.

Afterwards, the terminal device delivers the first D2D communication data to the MAC layer, and maps the first D2D communication data to the D2D shared transport channel according to the mapping relationship between the D2D service logical channel and the D2D shared transport channel in the MAC layer, and transmits the data through the D2D shared transmission. The channel delivers the first D2D communication data from the MAC layer to the physical layer.

S305: when the number of bits of the first D2D communication data is greater than the first preset threshold, the terminal device divides the first D2D communication data into at least a second D2D at the radio link control protocol layer. Communication data and third D2D communication data; wherein the first preset threshold is equal to the D2D The maximum number of bits carried by the Discovery transport channel, the number of bits of the second D2D communication data is less than or equal to the first preset threshold, and the number of bits of the third D2D communication data is greater than the number of bits of the second D2D communication data .

When the terminal device determines D2D The Discovery transmission channel cannot carry the first D2D communication data that is greater than the first preset threshold. When the terminal device determines that the number of bits of the first D2D communication data is greater than the first preset threshold, the terminal device passes the first D2D communication data to the PDCP layer. Processing and delivering the first D2D communication data from the PDCP layer to the RLC layer. Thereafter, the terminal device divides the first D2D communication data into at least the second D2D communication data and the third D2D communication data at the RLC layer. The number of bits of the second D2D communication data is less than or equal to a first preset threshold, and the number of bits of the third D2D communication data is greater than the number of bits of the second D2D communication data.

S306: The terminal device determines whether the third D2D communication data is greater than a second preset threshold; wherein the second preset threshold is a maximum number of bits carried by the D2D shared transport channel.

The step S306 is the same as the step S206 in the previous embodiment. For details, refer to the related description of S206 in the previous embodiment, and details are not described herein.

When the third D2D communication data is greater than the second preset threshold, step S307 is performed; when the third D2D communication data is less than or equal to the second preset threshold, step S308 is performed.

S307: When the third D2D communication data is greater than a second preset threshold, the terminal device divides the third D2D communication data in the radio link control protocol layer, where each divided D2D is divided. The number of bits of the communication data is less than or equal to the second preset threshold, the second D2D communication data includes scheduling information of the third D2D communication data, and the scheduling information is used to indicate that the third D2D communication data is used. Information on time-frequency resources.

The step S307 is the same as the step S207 in the previous embodiment. For details, refer to the related description of S207 in the previous embodiment, and details are not described herein.

S308: Submit the second D2D communication data to the ProSe protocol stack by using the mapping interface, and map the third D2D communication data to the D2D shared transport channel at the medium access control protocol layer.

The terminal device adds a source address and a destination address to the second D2D communication data and the third communication data at the RLC layer. The source address is used to identify the MAC address of the terminal device that sends the third D2D communication data and the fourth communication data, and the destination address is used to identify the MAC address of the terminal device that receives the third D2D communication data and the fourth communication data.

Optionally, after the terminal device divides the first D2D communication data into the third D2D communication data and the fourth D2D communication data, the terminal device may further add a dedicated in the MAC data packet header of the second D2D communication data at the RLC layer. Logical channel identifier, which is used to identify D2D The D2D communication data transmitted by the Discovery transport channel, which may be one byte. The dedicated logical channel identifier facilitates the terminal device to distinguish the second D2D communication data by using D2D. Whether the Discovery transport channel is transmitted or transmitted through the D2D shared transport channel.

Thereafter, the terminal device maps the second D2D communication data from the RLC layer to the ProSe protocol stack through a mapping interface between the RLC layer and the ProSe protocol stack; and delivers the third D2D communication data from the RLC layer to the MAC layer.

After the terminal device delivers the second D2D communication data from the ProSe protocol stack to the MAC layer, the terminal device according to the ProSe protocol stack and the D2D The mapping relationship of the Discovery transport channel, mapping the second D2D communication data to the D2D Discovery transport channel at the MAC layer, and passing the D2D The Discovery transport channel delivers the second D2D communication data to the physical layer. When the second D2D communication data is delivered to the physical layer, through the D2D The transmission resource corresponding to Discovery transmits the second D2D communication data, thereby transmitting the second D2D communication data to other terminal devices.

After the terminal device delivers the third D2D communication data from the RLC layer to the MAC layer, mapping the third D2D communication data to the D2D shared transport channel at the MAC layer according to the mapping relationship between the D2D service logical channel and the D2D shared transport channel in the MAC layer. And delivering the third D2D communication data to the physical layer through the D2D shared transport channel. After the third D2D communication data is delivered to the physical layer, the third D2D communication data is transmitted through the transmission resource corresponding to the D2D communication data, thereby transmitting the third D2D communication data to the other terminal device.

When the third D2D communication data is greater than the second preset threshold, after the terminal device performs step S307, the first D2D communication data is divided into the second D2D communication data and the third D2D communication data, and the third D2D communication data is again Divided into at least two pieces of D2D communication data, the second D2D communication data includes scheduling information of the third D2D communication data.

The terminal device adds a source address and a destination address to the second D2D communication data and each of the D2D communication data included in the third communication data at the RLC layer. The source address is used to identify a MAC address of the terminal device that sends the second D2D communication data and each D2D communication data included in the third communication data, and the destination address is used to identify that the second D2D communication data is received, and the third communication data is included. The MAC address of the terminal device for each D2D communication data.

Optionally, after the terminal device divides the first D2D communication data into the second D2D communication data and the third D2D communication data, the terminal device may further add a dedicated in the MAC data packet header of the second D2D communication data at the RLC layer. Logical channel identifier, which is used to identify D2D The D2D communication data transmitted by the Discovery transport channel, which may be one byte. The dedicated logical channel identifier facilitates the terminal device to distinguish the second D2D communication data by using D2D. Whether the Discovery transport channel is transmitted or transmitted through the D2D shared transport channel.

Thereafter, the terminal device maps the second D2D communication data from the RLC layer to the ProSe protocol stack through a mapping interface between the RLC layer and the ProSe protocol stack; and submits each D2D communication data included in the third D2D communication data from the RLC layer. Go to the MAC layer.

After the terminal device delivers the second D2D communication data from the ProSe protocol stack to the MAC layer, the terminal device according to the ProSe protocol stack and the D2D The mapping relationship of the Discovery transport channel, mapping the second D2D communication data to the D2D Discovery transport channel at the MAC layer, and passing the D2D The Discovery transport channel delivers the second D2D communication data to the physical layer.

Please refer to FIG. 5. FIG. 5 is a schematic diagram of an embodiment of the present application for transmitting a Discovery message and D2D communication data by using different physical resources. When the second D2D communication data is delivered to the physical layer, through the D2D The transmission resource corresponding to Discovery transmits the second D2D communication data, thereby transmitting the second D2D communication data to other terminal devices.

After the terminal device submits each D2D communication data included in the third D2D communication data from the RLC layer to the MAC layer, according to the mapping relationship between the D2D service logical channel and the D2D shared transport channel in the MAC layer, the third D2D communication is performed at the MAC layer. Each D2D communication data included in the data is mapped to the D2D shared transport channel, and each D2D communication data included in the third D2D communication data is delivered to the physical layer through the D2D shared transport channel.

After the D2D communication data included in the third D2D communication data is delivered to the physical layer, the terminal device further acquires each D2D communication in the third D2D communication data according to the scheduling information of the third D2D communication data included in the second D2D communication data. Data corresponding to the transmission resource, and each D2D communication data included in the third D2D communication data is separately transmitted through the transmission resource corresponding to each D2D communication data, thereby transmitting the third D2D communication data to other terminal devices.

In the above solution, the terminal device sets a mapping interface between the RLC layer and the ProSe protocol stack, and establishes a D2D service logical channel and D2D. The mapping relationship of the Discovery transmission channel, when determining that the first D2D communication data is less than or equal to the first preset threshold, mapping the first D2D communication data from the RLC layer to the ProSe protocol stack through a mapping interface between the RLC layer and the ProSe protocol stack, Thus through D2D The Discovery transmission channel transmits the first D2D communication data, and transmits the D2D communication data through the D2D Discovery transmission resource, which solves the problem that the prior art cannot pass the D2D. The technical problem that the Discovery transmission channel carries D2D communication data can improve the transmission efficiency of the data channel and improve the overall resource utilization of the LTE network.

When the first D2D communication data is greater than the first preset threshold, mapping the first D2D communication data to the D2D shared transmission channel, and transmitting the first D2D communication data through the D2D shared transmission channel; or dividing the first D2D communication into the first Two D2D communication data and third D2D communication data, through D2D The Discovery transmission channel transmits the second D2D communication data, and when the third D2D communication data is greater than the second preset threshold, the third D2D communication data may also be scheduled for transmission by using the second D2D communication data.

Please refer to FIG. 8. FIG. 8 is a flowchart of still another embodiment of the data transmission method of the present application. The execution entity of this embodiment is a terminal device, and the terminal device is a user terminal device (User Equipment, UE), wherein the UE may be a mobile terminal device such as a mobile phone. Two UEs can communicate directly to transmit data. In this embodiment, the terminal device does not need to add a source address and a destination address to the D2D communication data to be transmitted. The data transmission method of this embodiment includes the following steps:

S401: The terminal device sets a mapping relationship between the packet data convergence protocol layer and the ProSe protocol stack.

Please refer to FIG. 9 together. FIG. 9 is a schematic diagram of establishing a D2D service logical channel and D2D in the present application. A schematic diagram of an embodiment of a mapping relationship of Discovery transport channels.

The terminal device sets a mapping relationship between the PDCP layer and the ProSe protocol stack in the PDCP layer of the packet data convergence protocol, thereby establishing a D2D service logical channel and D2D. The mapping relationship between Discovery transport channels. The D2D service logical channel is in the PDCP layer.

When the terminal device transmits the D2D communication data, steps S402 to S204 are performed. The D2D communication data includes audio data, video data, and the like. The D2D communication data is generated by the application layer, processed by the TCP/UDP layer and the IP layer, and then processed into a protocol stack of the D2D direct communication mode for processing.

S402: The terminal device determines whether the number of bits of the first D2D communication data is less than or equal to a first preset threshold, where the first preset threshold is less than or equal to the D2D. The maximum number of bits carried by the Discovery transport channel.

When the terminal device needs to send the first D2D communication data to the other terminal device, the terminal device determines, after the first D2D communication data is delivered from the IP layer to the PDCP layer (the first D2D communication data enters the protocol stack of the D2D direct communication mode), Whether the number of bits of the first D2D communication data is less than or equal to a second preset threshold. Wherein, the first preset threshold is less than or equal to D2D The maximum number of bits carried by the Discovery transport channel. The maximum number of bits may be 232 bits, but is not limited thereto, and may be set to other values, which is not limited herein.

When the number of bits of the first D2D communication data is less than or equal to the first preset threshold, step S403 is performed.

When the number of bits of the first D2D communication data is greater than the first preset threshold, step S404 is performed.

S403: When the number of bits of the first D2D communication data is less than or equal to the first preset threshold, submit the first D2D communication data from the packet data convergence protocol layer to the ProSe protocol stack, The first D2D communication data sets a ProSe identifier, and maps the first D2D communication data to the D2D at the medium access control protocol layer a Discovery transport channel that transmits the first D2D communication data over the D2D Discovery transport channel.

When the terminal device determines that the number of bits of the first D2D communication data is less than or equal to the first preset threshold, after the first D2D communication data arrives at the PDCP layer, the terminal device sets the first D2D according to the mapping relationship between the PDCP layer and the ProSe protocol stack. The communication data is mapped to the ProSe protocol stack. The terminal device delivers the first D2D communication data from the ProSe protocol stack to the MAC layer, and then the terminal device according to the ProSe protocol stack and the D2D in the MAC layer The mapping relationship of the Discovery transport channel, mapping the first D2D communication data to the D2D Discovery transport channel, thereby passing the D2D The Discovery transport channel delivers the first D2D communication data from the MAC layer to the physical layer.

S404: when the number of bits of the first D2D communication data is greater than the first preset threshold, the terminal device submits the first D2D communication data from the packet data convergence protocol layer to the media access Controlling a protocol layer, and mapping the first D2D communication data to the D2D shared transport channel at the medium access control protocol layer, and transmitting the first D2D communication data through the D2D shared transport channel.

When the terminal device determines that the number of bits of the first D2D communication data is greater than the first preset threshold, after the first D2D communication data arrives at the PDCP layer, the terminal device performs the first D2D communication data at the PDCP layer and the RLC layer according to the prior art. After the processing method is processed, the first D2D communication data is delivered from the RLC layer to the MAC layer.

The terminal device maps the first D2D communication data to the D2D shared transport channel according to the mapping relationship between the D2D service logical channel and the D2D shared transport channel at the MAC layer, thereby delivering the first D2D communication data from the MAC layer to the D2D shared transport channel. Physical layer.

In the above solution, the terminal device sets a mapping relationship between the packet data convergence protocol layer and the ProSe protocol stack, and when determining that the number of bits of the first D2D communication data is less than or equal to a first preset threshold, the first D2D communication data is from the PDCP layer. Submit to the ProSe protocol stack to map the first D2D communication data to D2D Discovery transport channel, transmitting the first D2D communication data through the D2D Discovery transport channel, thereby passing D2D Discovery transmission resource transmits D2D communication data, which solves the problem that D2D cannot be passed in the prior art. The technical problem that the Discovery transmission channel carries D2D communication data can improve the transmission efficiency of the data channel and improve the overall resource utilization of the LTE network. Otherwise, the first D2D communication data is mapped to the D2D shared transport channel.

Please refer to FIG. 10. FIG. 10 is a flowchart of still another embodiment of the data transmission method of the present application. The execution entity of this embodiment is a terminal device, and the terminal device is a user terminal device (User Equipment, UE), wherein the UE may be a mobile terminal device such as a mobile phone. Two UEs can communicate directly to transmit data. The data transmission method of this embodiment includes the following steps:

S501: The terminal device receives D2D communication data sent by another terminal device other than the terminal device.

The terminal device receives D2D communication data transmitted by other terminal devices than the terminal device. The D2D communication data includes audio data, video data, and the like.

S502: The terminal device determines, according to the information of the D2D communication data, that the D2D communication data is from D2D. Discovery transport channel.

The terminal device determines whether the D2D communication data is from the D2D according to the received information of the D2D communication data. Discovery transport channel. The information of the D2D communication data may be the number of bits of the D2D communication data, the dedicated logical channel identifier, the source address and the destination address, the ProSe identifier, etc., and is not limited thereto, and is not limited herein.

It can be understood that the D2D communication data mentioned in this embodiment includes a data packet header and a data packet, and information such as a dedicated logical channel identifier, a source address, a destination address, and a ProSe identifier is included in a data packet header of the D2D communication data, and the terminal The device finally recognizes the data at the application layer except for the packet header.

Further, the information of the D2D communication data may include the number of bits of the D2D communication data and/or the dedicated logical channel identifier, and the dedicated logical channel identifier is used to identify the D2D communication data from the D2D. Discovery transport channel. When the terminal device determines, according to the information of the D2D communication data, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, or the D2D communication data includes a dedicated logical channel identifier, the D2D communication data is from the D2D. Discovery transport channel.

Further, the information of the D2D communication data may include a bit number of the D2D communication data, a dedicated logical channel identifier, and scheduling information, where the scheduling information is used to indicate a time-frequency resource used by the second D2D communication data, and the D2D communication data and the second D2D communication data. It is obtained by dividing the same D2D communication packet. When the terminal device determines, according to the information of the D2D communication data, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, and the D2D communication data includes a dedicated logical channel identifier and scheduling information, the D2D communication data is from the D2D. Discovery transport channel.

Further, the information of the D2D communication data may include the number of bits of the D2D communication data, the dedicated logical channel identifier, the source address and the destination address, and/or scheduling information, and the source address is used to identify the address of the terminal device that transmits the D2D communication data, and the purpose The address is used to identify the address of the terminal device that receives the D2D communication data. The scheduling information is used to indicate a time-frequency resource used by the second D2D communication data, and the D2D communication data and the second D2D communication data are segmented by the same D2D communication data packet. When the terminal device obtains the data packet header of the radio link control protocol layer from the information of the D2D communication data, includes a source address and a destination address, and determines that the number of bits of the D2D communication data is less than or equal to a first preset threshold or the D2D communication data includes dedicated logic. When the channel identifier, or D2D communication data contains scheduling information, the D2D communication data comes from D2D. Discovery transport channel.

Further, the information of the D2D communication data may include the number of bits of the D2D communication data and the ProSe identifier, and the ProSe identifier is used to identify the D2D communication data from the data packet convergence protocol layer and pass the D2D. Discovery transport channel transmission. When the terminal device determines, according to the information of the D2D communication data, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, and the D2D communication data includes the ProSe identifier, the D2D communication data is from the D2D. Discovery transport channel.

When the D2D communication data is from the D2D Discovery transmission channel, step S503 is performed.

When the D2D communication data comes from the D2D shared transport channel, the D2D communication data is mapped to the D2D shared transport channel for processing according to the prior art method. Since the D2D communication data is generated at the application layer by other terminal devices than the terminal device, after the terminal device delivers the D2D communication data to the application layer, the D2D communication data is recognized at the application layer, and the function corresponding to the D2D communication data is implemented.

S503: The terminal device is configured according to the information of the D2D communication data, and the D2D service logical channel and the D2D acquired by the terminal device. a mapping relationship of the Discovery transport channel, mapping the D2D communication data to the D2D Discovery transmits a channel and identifies the D2D communication data to implement a function corresponding to the D2D communication data.

The terminal device according to the information of the D2D communication data and the D2D service logical channel and the D2D acquired by the terminal device The mapping relationship of the Discovery transport channel maps the D2D communication data to the D2D Discovery transport channel. The D2D service logical channel and D2D obtained by the terminal device The mapping relationship of the Discovery transport channel may be broadcasted by the serving base station; or may be a mapping relationship that is acquired by the terminal device and matched with the information of the D2D communication data.

Further, when the information of the D2D communication data includes the number of bits of the D2D communication data and/or the dedicated logical channel identifier, the D2D service logical channel acquired by the terminal device and the D2D Figure 3-1 shows the mapping relationship of the Discovery transport channel.

The terminal device according to the information of the D2D communication data and the D2D service logical channel and D2D acquired by the terminal device Mapping the Discovery transport channel, mapping the D2D communication data to the D2D Discovery transport channel includes:

When the terminal device determines, according to the information of the D2D communication data, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, or the D2D communication data includes a dedicated logical channel identifier, the terminal device passes the D2D communication data through the D2D. The Discovery transport channel is delivered to the medium access control protocol layer, and the D2D communication data is mapped to the D2D service logical channel at the medium access control protocol layer according to the acquired mapping relationship. Wherein, the first preset threshold is less than or equal to D2D The maximum number of bits carried by the Discovery transport channel; the obtained mapping relationship is the D2D service logical channel and D2D established at the medium access control protocol layer. The mapping relationship of the Discovery transport channel.

Further, when the information of the D2D communication data includes the number of bits of the D2D communication data, the dedicated logical channel identifier, and the scheduling information, the D2D service logical channel acquired by the terminal device and the D2D Figure 3-2 shows the mapping relationship of the Discovery transport channel.

When the terminal device determines, according to the information of the D2D communication data, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, and the D2D communication data includes the dedicated logical channel identifier, the terminal device acquires the second D2D communication data according to the scheduling information.

After acquiring the second D2D communication data, the terminal device passes the D2D communication data through the D2D. The Discovery transport channel is delivered to the medium access control protocol layer, and the second D2D communication data is delivered to the medium access control protocol layer through the D2D shared transport channel, and the D2D communication data and the first in the medium access control protocol layer according to the mapping relationship The two D2D communication data is mapped to the D2D service logical channel.

After the terminal device delivers the D2D communication data and the second D2D communication data from the MAC layer to the radio link control protocol layer, the D2D communication data and the second D2D communication data packet are restored at the radio link control protocol layer to obtain the D2D before the segmentation. Communication packet.

Further, when the information of the D2D communication data includes the number of bits of the D2D communication data, the dedicated logical channel identifier, the source address and the destination address, and/or the scheduling information, the D2D service logical channel acquired by the terminal device and the D2D A schematic diagram of the mapping relationship of the Discovery transport channel is shown in FIG. 7.

When the terminal device obtains the data packet header of the radio link control protocol layer from the information of the D2D communication data, includes a source address and a destination address, and determines that the number of bits of the D2D communication data is less than or equal to a first preset threshold or the D2D communication data includes dedicated logic. When the channel is identified, the terminal device passes the D2D communication data through D2D. The Discovery transport channel is delivered to the medium access control protocol layer, and the D2D communication data is mapped to the ProSe protocol stack at the medium access control protocol layer.

Thereafter, the terminal device delivers the D2D communication data to the radio link control protocol layer through a mapping interface between the radio link control protocol layer and the ProSe protocol stack.

The terminal device acquires the second D2D communication data according to the scheduling information when the terminal device further acquires the scheduling information from the information of the D2D communication data. After acquiring the second D2D communication data, the terminal device passes the D2D communication data through the D2D. The Discovery transport channel is delivered to the medium access control protocol layer, and the D2D communication data is mapped to the ProSe protocol stack at the medium access control protocol layer, and then the terminal device controls the mapping interface between the protocol layer and the ProSe protocol stack through the radio link. The D2D communication data is delivered to the radio link control protocol layer.

The terminal device delivers the second D2D communication data to the medium access control protocol layer through the D2D shared transmission channel, and maps the D2D communication data and the second D2D communication data to the D2D service logical channel at the medium access control protocol layer according to the mapping relationship, The second D2D communication data is delivered to the radio link control protocol layer through the D2D service logical channel.

Further, when the information of the D2D communication data may include the number of bits of the D2D communication data and the ProSe identifier, the D2D service logical channel acquired by the terminal device and the D2D A schematic diagram of the mapping relationship of the Discovery transport channel is shown in FIG.

When the terminal device determines, according to the information of the D2D communication data, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, and the D2D communication data includes the ProSe identifier, the terminal device passes the D2D communication data through the D2D. The Discovery transport channel is delivered to the medium access control protocol layer, and the D2D communication data is mapped to the ProSe protocol stack at the medium access control protocol layer. Then, the terminal device maps the D2D communication data to the packet data convergence protocol layer according to the mapping relationship between the ProSe protocol stack and the packet data convergence protocol layer.

After the terminal device delivers the D2D communication data D2D communication data to the application layer, the D2D communication data is identified, and the function corresponding to the D2D communication data is implemented. The D2D communication data recognized by the terminal device is data other than the packet header.

In the above solution, the terminal device receives the D2D communication data sent by the terminal device other than the terminal device, and determines the D2D communication data from the D2D according to the information of the D2D communication data. Discovery transport channel, based on information of D2D communication data and D2D service logical channel and D2D acquired by the terminal device The mapping relationship of the Discovery transport channel maps the D2D communication data to the D2D Discovery transport channel, thereby identifying the D2D communication data to implement the function corresponding to the D2D communication data.

Please refer to FIG. 11. FIG. 11 is a schematic structural diagram of an embodiment of a data transmission apparatus of the present application. The data transmission device of this embodiment may be a terminal device. The terminal device is a user terminal device (User Equipment, UE), wherein the UE may be a mobile terminal device such as a mobile phone. Two UEs can communicate directly to transmit data. The modules included in the data transmission apparatus of this embodiment are used to perform the steps in the embodiments corresponding to FIG. 1 and FIG. 1. For details, refer to the related descriptions of the steps in the embodiment corresponding to FIG. 1 and FIG. Do not repeat them. The data transmission apparatus of this embodiment includes a setup module 110, a determination module 120, a mapping module 130, and a transmission module 140.

The establishing module 110 is configured to establish a D2D service logical channel and D2D The mapping relationship of the Discovery transport channel. For example, the setup module 110 establishes a D2D service logical channel and D2D. The mapping relationship of the Discovery transport channel. The establishing module 110 establishes a D2D service logical channel and D2D After the mapping of the Discovery transport channel, the notification information is sent to the determining module 120.

The determining module 120 is configured to receive the notification information sent by the establishing module 110, and determine whether the number of bits of the first D2D communication data reaches a threshold value, wherein the first D2D communication data is D2D communication data to be transmitted. For example, the determining module 120 receives the notification information sent by the establishing module 110, and determines whether the number of bits of the first D2D communication data reaches a threshold value, wherein the first D2D communication data is D2D communication data to be transmitted. The determination module 120 sends the determination result to the mapping module 130.

The mapping module 130 is configured to receive the determination result sent by the determining module 120. When the determining module 120 determines that the first D2D communication data does not reach the threshold, the first D2D communication data is mapped to the D2D according to the mapping relationship established by the establishing module 110. Discovery transport channel.

For example, the mapping module 130 receives the determination result sent by the determining module 120. When the determining module 120 determines that the first D2D communication data does not reach the threshold, the first D2D communication data is mapped to the D2D according to the mapping relationship established by the establishing module 110. Discovery transport channel. The mapping module 130 transmits the notification information to the transmission module 140 after mapping the first D2D communication data to the D2D Discovery transmission channel.

The transmission module 140 is configured to receive the notification information sent by the mapping module 130, by using D2D. The Discovery transport channel transmits the first D2D communication data.

Please refer to FIG. 12. FIG. 12 is a schematic structural diagram of another embodiment of a data transmission apparatus according to the present application. The data transmission device of this embodiment may be a terminal device. The terminal device is a user terminal device (User Equipment, UE), wherein the UE may be a mobile terminal device such as a mobile phone. Two UEs can communicate directly to transmit data. The modules included in the data transmission device of this embodiment are used to distribute the steps in the respective embodiments corresponding to FIG. 2, FIG. 6, and FIG. 8. For details, refer to FIG. 2, FIG. 6, FIG. The related description of each step in the embodiment is not described here. The data transmission device of this embodiment includes an establishing module 210, a determining module 220, a dividing module 230, an information setting module 240, a mapping module 250, and a transmission module 260.

The establishing module 210 is configured to establish a D2D service logical channel and D2D directly at the medium access control protocol layer. Discovery transmission channel mapping relationship; or set mapping interface between the radio link control protocol layer and the ProSe protocol stack to establish D2D service logical channel and D2D The mapping relationship of the Discovery transport channel. For example, the establishing module 210 directly establishes a D2D service logical channel and D2D at the medium access control protocol layer. Discovery transmission channel mapping relationship; or set mapping interface between the radio link control protocol layer and the ProSe protocol stack to establish D2D service logical channel and D2D The mapping relationship of the Discovery transport channel.

The establishing module 210 is configured to set a mapping relationship between the packet data convergence protocol layer and the ProSe protocol stack. For example, the establishing module 210 sets a mapping relationship between the packet data convergence protocol layer and the ProSe protocol stack.

The establishing module 210 establishes a D2D service logical channel and D2D After the mapping relationship of the Discovery transport channel, the notification information is sent to the determining module.

The determining module 220 is configured to receive the notification information sent by the establishing module 210, and determine whether the number of bits of the first D2D communication data is less than or equal to a first preset threshold. The determining module 220 passes the determination result to the segmentation module 230, the information setting module 240, and the mapping module 250.

When the establishing module 210 is used to establish a D2D service logical channel and D2D directly at the medium access control protocol layer Discovery transmission channel mapping relationship; or set mapping interface between the radio link control protocol layer and the ProSe protocol stack to establish D2D service logical channel and D2D The partitioning module 230 is configured to receive the determination result sent by the determining module 220. When the determining module 220 determines that the number of bits of the first D2D communication data is greater than the first preset threshold, the determining module 220 is in the radio link control protocol layer. Separating the first D2D communication data into at least second D2D communication data and third D2D communication data; wherein the first preset threshold is equal to D2D The maximum number of bits carried by the Discovery transport channel, the number of bits of the second D2D communication data is less than or equal to a first preset threshold, and the number of bits of the third D2D communication data is greater than the number of bits of the second D2D communication data.

For example, the segmentation module 230 receives the determination result sent by the determining module 220. When the determining module 220 determines that the number of bits of the first D2D communication data is greater than the first preset threshold, the first D2D communication data is segmented at least in the radio link control protocol layer. Is second D2D communication data and third D2D communication data; wherein the first preset threshold is equal to D2D The maximum number of bits carried by the Discovery transport channel, the number of bits of the second D2D communication data is less than or equal to a first preset threshold, and the number of bits of the third D2D communication data is greater than the number of bits of the second D2D communication data.

The segmentation module 230 is further configured to determine whether the number of bits of the third D2D communication data obtained by the segmentation is greater than a second preset threshold; wherein, the second preset threshold is a maximum number of bits carried by the D2D shared transport channel; and When the number of bits of the D2D communication data is greater than the second preset threshold, the third D2D communication data is divided at the radio link control protocol layer, wherein the number of bits of each of the divided D2D communication data is less than or equal to the second preset. The threshold, the second D2D communication data includes scheduling information of the third D2D communication data, and the scheduling information is used to indicate information of a time-frequency resource used by the third D2D communication data.

For example, after the first D2D communication data is divided into the second D2D communication data and the third D2D communication data, the segmentation module 230 determines whether the number of bits of the third D2D communication data obtained by the segmentation is greater than a second preset threshold; The second preset threshold is the maximum number of bits carried by the D2D shared transport channel. When the number of bits of the third D2D communication data is greater than the second preset threshold, the third D2D communication data is divided at the radio link control protocol layer, wherein the number of bits of each of the divided D2D communication data is less than or equal to the first The second preset threshold, the second D2D communication data includes scheduling information of the third D2D communication data, and the scheduling information is used to indicate information of the time-frequency resource used by the third D2D communication data.

The segmentation module 230 transmits the notification information to the information setting module 240 after completing the segmentation of the first D2D communication data.

The information setting module 240 is configured to receive the determination result sent by the determining module 220, and the notification information sent by the segmentation module 230. The determining module 220 determines that the number of bits of the first D2D communication data is less than or equal to a first preset threshold, or receives the segmentation module. When the notification information is sent by 230, the source address and the destination address are added to the first D2D communication data at the medium access control protocol layer, and a dedicated logical channel identifier is added, where the source address is used to identify the terminal device that sends the first D2D communication data. Address, the destination address is used to identify the address of the terminal device receiving the first D2D communication data, and the dedicated logical channel identifier is used to identify the D2D Discovery transmits D2D communication data for the channel.

For example, the determination result sent by the receiving determination module 220 and the notification information sent by the segmentation module 230 are determined by the determining module 220 to determine that the number of bits of the first D2D communication data is less than or equal to the first preset threshold, or the notification sent by the segmentation module 230 is received. In the information, the source address and the destination address are added to the first D2D communication data at the medium access control protocol layer, and the dedicated logical channel identifier is added, wherein the source address is used to identify the address of the terminal device that sends the first D2D communication data, and the purpose is The address is used to identify the address of the terminal device that receives the first D2D communication data, and the dedicated logical channel identifier is used to identify the D2D Discovery transmits D2D communication data for the channel.

The information setting module 240 sends the notification information to the mapping module after completing the addition of the source address and the destination address.

The mapping module 250 is configured to receive the notification information sent by the information setting module 240, and map the first D2D communication data to the D2D at the medium access control protocol layer when the number of bits of the first D2D communication data is less than or equal to the first preset threshold. Discovery transport channel; or submit the first D2D communication data to the ProSe protocol stack through the mapping interface to map the first D2D communication data to the D2D at the medium access control protocol layer a discovery channel; and configured to map the first D2D communication data to the D2D shared transmission channel when the number of bits of the first D2D communication data is greater than a first preset threshold; wherein the first preset threshold is less than or equal to D2D The maximum number of bits carried by the Discovery transport channel.

For example, the mapping module 250 receives the notification information sent by the information setting module 240, and maps the first D2D communication data to the D2D at the medium access control protocol layer when the number of bits of the first D2D communication data is less than or equal to the first preset threshold. Discovery transport channel; or submit the first D2D communication data to the ProSe protocol stack through the mapping interface to map the first D2D communication data to the D2D at the medium access control protocol layer Discovery transport channel. When the number of bits of the first D2D communication data is greater than the first predetermined threshold, the first D2D communication data is mapped to the D2D shared transmission channel. Wherein, the first preset threshold is less than or equal to D2D The maximum number of bits carried by the Discovery transport channel.

When the establishing module 210 is configured to set a mapping relationship between the packet data convergence protocol layer and the ProSe protocol stack, the mapping module 250 is configured to receive the determination result sent by the determining module 220, where the determining module 220 determines the number of bits of the first D2D communication data. When less than or equal to the first preset threshold, the first D2D communication data is delivered from the packet data convergence protocol layer to the ProSe protocol stack, the ProSe identifier is set to the first D2D communication data, and the first D2D communication is set at the medium access control protocol layer. Data mapping to D2D a discovery channel: when the determining module 220 determines that the number of bits of the first D2D communication data is greater than the first preset threshold, the first D2D communication data is delivered from the packet data convergence protocol layer to the medium access control protocol layer, and is connected in the medium The incoming control protocol layer maps the first D2D communication data to the D2D shared transport channel. Wherein, the first preset threshold is less than or equal to D2D The maximum number of bits carried by the Discovery transport channel.

For example, the mapping module 250 receives the determination result sent by the determining module 220. When the determining module 220 determines that the number of bits of the first D2D communication data is less than or equal to the first preset threshold, the first D2D communication data is delivered from the packet data convergence protocol layer to the The ProSe protocol stack sets a ProSe identifier for the first D2D communication data, and maps the first D2D communication data to the D2D at the medium access control protocol layer a discovery channel: when the determining module 220 determines that the number of bits of the first D2D communication data is greater than the first preset threshold, the first D2D communication data is delivered from the packet data convergence protocol layer to the medium access control protocol layer, and is connected in the medium The incoming control protocol layer maps the first D2D communication data to the D2D shared transport channel. Wherein, the first preset threshold is less than or equal to D2D The maximum number of bits carried by the Discovery transport channel.

After the mapping module 250 completes the first D2D communication data mapping, the mapping module 250 transmits the notification information to the transmission module 260.

The transmission module 260 is configured to receive the notification information sent by the mapping module 250, by using D2D. The Discovery transport channel transmits the first D2D communication data or transmits the first D2D communication data through a D2D shared transport channel. For example, the transmission module 260 receives the notification information sent by the mapping module 250, and passes the D2D. The Discovery transport channel transmits the first D2D communication data or transmits the first D2D communication data through the D2D shared transport channel.

In the above solution, the terminal device establishes a D2D service logical channel and D2D The mapping relationship of the Discovery transmission channel, when determining that the first D2D communication data is less than or equal to the first preset threshold, mapping the first D2D communication data to the D2D Discovery transmission channel, and passing the D2D The Discovery transmission channel transmits the first D2D communication data, and transmits the D2D communication data through the D2D Discovery transmission resource, which solves the problem that the prior art cannot pass the D2D. The technical problem that the Discovery transmission channel carries D2D communication data can improve the transmission efficiency of the data channel and improve the overall resource utilization of the LTE network.

Please refer to FIG. 13. FIG. 13 is a schematic structural diagram of still another embodiment of the data transmission apparatus of the present application. The data transmission device of this embodiment may be a terminal device. The terminal device is a user terminal device (User Equipment, UE), wherein the UE may be a mobile terminal device such as a mobile phone. Two UEs can communicate directly to transmit data. The modules included in the data transmission device of this embodiment are used to perform the steps in the embodiments corresponding to FIG. 10 and FIG. 10 . For details, refer to the related descriptions of the steps in the embodiment corresponding to FIG. 10 and FIG. 10 . Do not repeat them. The data transmission apparatus of this embodiment includes a receiving module 310, a determining module 320, and a mapping module 330.

The receiving module 310 is configured to receive D2D communication data sent by other terminal devices. For example, the receiving module 310 receives D2D communication data sent by other terminal devices. The receiving module 310 transmits the D2D communication data to the determining module 320.

The determining module 320 is configured to receive the D2D communication data sent by the receiving module 310, and determine that the D2D communication data is from the D2D according to the information of the D2D communication data received by the receiving module 310. Discovery transport channel. For example, the determining module 320 receives the D2D communication data sent by the receiving module 310, and determines that the D2D communication data is from the D2D according to the information of the D2D communication data received by the receiving module 310. Discovery transport channel. The determination module 320 transmits the determination result to the mapping module 330.

The mapping module 330 is configured to receive the determination result sent by the determining module 320, when the determining module 320 determines that the D2D communication data is from the D2D. When the Discovery transport channel is used, the D2D communication data is mapped to the D2D according to the information of the D2D communication data and the mapping relationship between the acquired D2D service logical channel and the D2D Discovery transport channel. The Discovery transport channel recognizes the D2D communication data and implements the function corresponding to the D2D communication data after the D2D communication data is delivered to the application layer.

Please refer to FIG. 14. FIG. 14 is a schematic structural diagram of still another embodiment of the data transmission apparatus of the present application. The data transmission device of this embodiment may be a terminal device. The terminal device is a user terminal device (User Equipment, UE), wherein the UE may be a mobile terminal device such as a mobile phone. Two UEs can communicate directly to transmit data. The modules included in the data transmission device of this embodiment are used to perform the steps in the embodiments corresponding to FIG. 10 and FIG. 10 . For details, refer to the related descriptions of the steps in the embodiment corresponding to FIG. 10 and FIG. 10 . Do not repeat them. The data transmission apparatus of this embodiment includes a receiving module 410, a determining module 420, a mapping module 430, and a restoration module 440.

The receiving module 410 is configured to receive D2D communication data sent by other terminal devices. The information of the D2D communication data received by the receiving module 410 includes the number of bits of the D2D communication data and/or a dedicated logical channel identifier, and the dedicated logical channel identifier is used to identify the D2D communication data from the D2D. Discovery transport channel. The information of the D2D communication data received by the receiving module 410 further includes a source address and a destination address. The source address is used to identify an address of the terminal device that transmits the D2D communication data, and the destination address is used to identify the address of the terminal device that receives the D2D communication data.

The information of the D2D communication data received by the receiving module 410 includes the number of bits of the D2D communication data and the ProSe identifier, and the ProSe identifier is used to identify that the D2D communication data is from the data packet convergence protocol layer.

For example, the receiving module 410 receives D2D communication data sent by other terminal devices. The information of the D2D communication data received by the receiving module 410 includes the number of bits of the D2D communication data and/or a dedicated logical channel identifier, and the dedicated logical channel identifier is used to identify the D2D communication data from the D2D. Discovery transport channel. The information of the D2D communication data received by the receiving module 410 includes the number of bits of the D2D communication data, the source address, the destination address, and/or the dedicated logical channel identifier. The source address is used to identify the address of the terminal device that transmits the D2D communication data, and the destination address is used to identify the address of the terminal device that receives the D2D communication data. The information of the D2D communication data received by the receiving module 410 includes the number of bits of the D2D communication data and the ProSe identifier, and the ProSe identifier is used to identify that the D2D communication data is from the data packet convergence protocol layer.

The receiving module 410 transmits the D2D communication data to the determining module 420.

The determining module 420 is configured to receive the D2D communication data sent by the receiving module 410, and determine that the D2D communication data is from the D2D according to the information of the D2D communication data received by the receiving module 410. Discovery transport channel. For example, the determining module 420 receives the D2D communication data sent by the receiving module 410, and determines that the D2D communication data is from the D2D according to the information of the D2D communication data received by the receiving module 410. Discovery transport channel.

The determining module 420 is configured to: when determining, according to the information of the D2D communication data received by the receiving module 410, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, or the D2D communication data includes a dedicated logical channel identifier, confirming that the D2D communication data is from D2D Discovery transport channel; wherein the first preset threshold is less than or equal to D2D The maximum number of bits carried by the Discovery transport channel. For example, when the determining module 420 determines, according to the information of the D2D communication data received by the receiving module 410, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, or the D2D communication data includes a dedicated logical channel identifier, confirm that the D2D communication data is from the D2D. The Discovery transport channel; wherein the first preset threshold is less than or equal to the maximum number of bits carried by the D2D Discovery transport channel.

The determining module 420 is configured to: when determining, according to the information of the D2D communication data received by the receiving module 410, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, and the D2D communication data includes the dedicated logical channel identifier, confirming that the D2D communication data is from the D2D Discovery transport channel. For example, when the determining module 420 determines that the number of bits of the D2D communication data is less than or equal to the first preset threshold according to the information of the D2D communication data received by the receiving module 410, and the D2D communication data includes the dedicated logical channel identifier, confirm that the D2D communication data is from the D2D. Discovery transport channel.

The determining module 420 is configured to: when the information of the D2D communication data received from the receiving module 410 is acquired, the data packet header of the radio link control protocol layer includes a source address and a destination address, and determine that the number of bits of the D2D communication data is less than or equal to the first preset. Confirm that D2D communication data comes from D2D when the threshold or D2D communication data contains a dedicated logical channel identifier Discovery transport channel. For example, when the determining module 420 obtains the data packet header of the radio link control protocol layer from the information of the D2D communication data received by the receiving module 410, the source address and the destination address are determined, and the number of bits of the D2D communication data is determined to be less than or equal to the first preset. Confirm that D2D communication data comes from D2D when the threshold or D2D communication data contains a dedicated logical channel identifier Discovery transport channel.

The determining module 420 is configured to: when determining, according to the information of the D2D communication data received by the receiving module 410, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, and the D2D communication data includes the ProSe identifier, confirming that the D2D communication data is from the D2D Discovery transport channel. For example, when the determining module 420 determines, according to the information of the D2D communication data received by the receiving module 410, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, and the D2D communication data includes the ProSe identifier, confirm that the D2D communication data is from the D2D. Discovery transport channel.

The determination module 420 transmits the determination result to the mapping module 430.

The mapping module 430 receives the determination result sent by the determining module 420, and the mapping module is configured to: when the determining module 420 determines that the number of bits of the D2D communication data is less than or equal to a first preset threshold, or the D2D communication data includes a dedicated logical channel identifier, the determining module 420 determines D2D communication data through D2D The Discovery transport channel is delivered to the media access control protocol layer, and the D2D communication data is mapped to the D2D service logical channel at the medium access control protocol layer according to the obtained mapping relationship, wherein the acquired mapping relationship is in the media access control D2D service logical channel established by protocol layer and D2D The mapping relationship of the Discovery transport channel.

When the information of the D2D communication data received by the receiving module 410 further includes scheduling information (the scheduling information is used to indicate the time-frequency resource used by the second D2D communication data), the mapping module 430 is further configured to: when determining, the information of the module 420 according to the D2D communication data. Determining that the number of bits of the D2D communication data is less than or equal to a first preset threshold, and when the D2D communication data includes the dedicated logical channel identifier, acquiring the second D2D communication data according to the scheduling information; and for passing the D2D communication data through the D2D The Discovery transport channel is delivered to the medium access control protocol layer, and the second D2D communication data is delivered to the medium access control protocol layer through the D2D shared transport channel, and the D2D communication data and the second D2D communication are performed at the medium access control protocol layer. The data is mapped to the D2D service logical channel.

For example, when the determining module 420 determines that the number of bits of the D2D communication data is less than or equal to the first preset threshold according to the information of the D2D communication data, and the D2D communication data includes the dedicated logical channel identifier, the mapping module 430 acquires the second D2D communication data according to the scheduling information. Passing D2D communication data through the D2D The Discovery transport channel is delivered to the medium access control protocol layer, and the second D2D communication data is delivered to the medium access control protocol layer through the D2D shared transport channel, and the D2D communication data and the second D2D communication are performed at the medium access control protocol layer. The data is mapped to the D2D service logical channel.

When the information of the D2D communication data received by the receiving module 410 further includes scheduling information, the mapping module 430 sends the D2D communication data and the second D2D communication data to the D2D service logical channel after the medium access control protocol layer, and sends the data to the restoration module 440. Notification information.

The mapping module 430 is configured to: when the determining module 420 obtains the data packet header of the radio link control protocol layer from the D2D communication data, includes a source address and a destination address, and determine that the number of bits of the D2D communication data is less than or equal to a first preset threshold or D2D communication. When the data includes a dedicated logical channel identifier, the D2D communication data determined by the determination module 420 is passed through the D2D. The Discovery transport channel is delivered to the medium access control protocol layer, and the D2D communication data is mapped to the ProSe protocol stack at the medium access control protocol layer; and the D2D communication is performed through a mapping interface between the radio link control protocol layer and the ProSe protocol stack. The data is submitted to the Radio Link Control Protocol layer.

For example, when the determining module 420 obtains the data packet header of the radio link control protocol layer from the D2D communication data, the source address and the destination address are included, and it is determined that the number of bits of the D2D communication data is less than or equal to a first preset threshold or the D2D communication data includes a dedicated When the logical channel is identified, the mapping module 430 passes the D2D communication data determined by the determining module 420 through the D2D. The Discovery transport channel is delivered to the medium access control protocol layer, and the D2D communication data is mapped to the ProSe protocol stack at the medium access control protocol layer; and the D2D communication is performed through a mapping interface between the radio link control protocol layer and the ProSe protocol stack. The data is submitted to the Radio Link Control Protocol layer.

The mapping module 430 is configured to: when the determining module 420 determines that the number of bits of the D2D communication data is less than or equal to a first preset threshold, and the D2D communication data includes the ProSe identifier, pass the D2D communication data determined by the determining module 420 to the D2D. The Discovery transport channel is delivered to the medium access control protocol layer, and the D2D communication data is mapped to the ProSe protocol stack at the medium access control protocol layer; and the D2D communication data is used according to the mapping relationship between the ProSe protocol stack and the packet data convergence protocol layer. Map to the packet data aggregation protocol layer.

The restoration module 440 is configured to receive the notification information that is sent by the mapping module 430 after the media access control protocol layer maps the D2D communication data and the second D2D communication data to the D2D service logical channel, and maps the mapping module 430 at the radio link control protocol layer. The D2D communication data and the second D2D communication data packet are restored to obtain the D2D communication data packet before the division.

Referring to FIG. 15, FIG. 15 is a schematic structural diagram of still another embodiment of a data transmission apparatus according to the present application. The data transmission device of this embodiment may be a terminal device. The terminal device is a user terminal device (User Equipment, UE), wherein the UE may be a mobile terminal device such as a mobile phone. Two UEs can communicate directly to transmit data. The terminal device of this embodiment example includes a transceiver 510, a processor 520, a read only memory 530, a random access memory 540, and a bus 550.

The transceiver 510 is configured to receive and transmit data.

The processor 520 controls the operation of the terminal device, and the processor 520 may also be referred to as a CPU (Central Processing). Unit, central processing unit). Processor 520 may be an integrated circuit chip with signal processing capabilities. Processor 520 can also be a general purpose processor, digital signal processor (DSP), application specific integrated circuit (ASIC), off-the-shelf programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component . The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory can include read only memory 530 and random access memory 540 and provides instructions and data to processor 520. A portion of the memory may also include non-volatile random access memory (NVRAM).

The various components of the data transfer device are coupled together by a bus 550, which may include, in addition to the data bus, a power bus, a control bus, a status signal bus, and the like. However, for clarity of description, various buses are labeled as bus 550 in the figure.

The memory stores the following elements, executable modules or data structures, or a subset of them, or their extended set:

Operation instructions: include various operation instructions for implementing various operations.

Operating system: Includes a variety of system programs for implementing various basic services and handling hardware-based tasks.

In the embodiment of the present invention, the processor 520 performs the following operations by calling an operation instruction stored in the memory, which can be stored in the operating system:

The processor 520 is configured to establish a mapping relationship between the D2D service logical channel and the D2D Discovery transmission channel.

The processor 520 is configured to determine whether the number of bits of the first D2D communication data reaches a threshold value, wherein the first D2D communication data is D2D communication data to be transmitted;

The processor 520 is configured to: when determining that the first D2D communication data does not reach the threshold, map the first D2D communication data to the D2D according to the mapping relationship Discovery transmits a channel and transmits the first D2D communication data through the D2D Discovery transmission channel.

Optionally, the processor 520 is configured to establish a D2D service logical channel and D2D directly at the medium access control protocol layer. Discovery transmission channel mapping relationship; or set mapping interface between the radio link control protocol layer and the ProSe protocol stack to establish D2D service logical channel and D2D The mapping relationship of the Discovery transport channel.

Optionally, the processor 520 is configured to: when the number of bits of the first D2D communication data is less than or equal to a first preset threshold, map the first D2D communication data to the D2D Discovery a transport channel; or submit the first D2D communication data to the ProSe protocol stack through the mapping interface to map the first D2D communication data to the D2D at the medium access control protocol layer a discovery channel: wherein the first preset threshold is less than or equal to a maximum number of bits carried by the D2D Discovery transport channel.

Optionally, the processor 520 is further configured to: when the number of bits of the first D2D communication data is greater than the first preset threshold, map the first D2D communication data to a D2D shared transport channel, by using the D2D The first D2D communication data is transmitted by a shared transport channel.

Optionally, the processor 520 is further configured to: at least divide the first D2D communication data at the radio link control protocol layer when the number of bits of the first D2D communication data is greater than the first preset threshold. And being the second D2D communication data and the third D2D communication data; wherein the first preset threshold is equal to the D2D The maximum number of bits carried by the Discovery transport channel, the number of bits of the second D2D communication data is less than or equal to the first preset threshold, and the number of bits of the third D2D communication data is greater than the number of bits of the second D2D communication data ;

The processor 520 is further configured to map the second D2D communication data to the D2D at the medium access control protocol layer Discovering a transport channel, or delivering the second D2D communication data to the ProSe protocol stack through the mapping interface; and mapping the third D2D communication data to the D2D share at the medium access control protocol layer Transport channel.

Optionally, the processor 520 is further configured to determine whether the number of bits of the third D2D communication data is greater than a second preset threshold, where the second preset threshold is a maximum number of bits carried by the D2D shared transport channel. ;

The processor 520 is further configured to: when the number of bits of the third D2D communication data is greater than the second preset threshold, segment the third D2D communication data at the radio link control protocol layer, where The number of bits of the D2D communication data is less than or equal to the second preset threshold, and the second D2D communication data includes scheduling information of the third D2D communication data, where the scheduling information is used to indicate the The information of the time-frequency resource used by the three D2D communication data.

Optionally, the processor 520 is further configured to add a source address and a destination address to the first D2D communication data at the medium access control protocol layer or the radio link control protocol layer, and add a dedicated logical channel identifier, where The source address is used to identify an address of a terminal device that sends the first D2D communication data, where the destination address is used to identify an address of a terminal device that receives the first D2D communication data, where the dedicated logical channel identifier is used for Identify the D2D Discovery transmits D2D communication data for the channel.

Optionally, the processor 520 is configured to set a mapping relationship between the packet data convergence protocol layer and the ProSe protocol stack.

Optionally, the processor 520 is configured to: when the number of bits of the first D2D communication data is less than or equal to a first preset threshold, submit the first D2D communication data from the packet data convergence protocol layer to the ProSe a protocol stack, setting a ProSe identity to the first D2D communication data, and mapping the first D2D communication data to the D2D at the media access control protocol layer a discovery channel: wherein the first preset threshold is less than or equal to a maximum number of bits carried by the D2D Discovery transport channel.

Optionally, the processor 520 is further configured to: when the number of bits of the first D2D communication data is greater than the first preset threshold, submit the first D2D communication data from the packet data convergence protocol layer to the The medium access control protocol layer, and mapping the first D2D communication data to the D2D shared transport channel at the medium access control protocol layer.

Referring to FIG. 16, FIG. 16 is a schematic structural diagram of still another embodiment of a data transmission apparatus of the present application. The data transmission device of this embodiment may be a terminal device. The terminal device is a user terminal device (User Equipment, UE), wherein the UE may be a mobile terminal device such as a mobile phone. Two UEs can communicate directly to transmit data. The terminal device of this embodiment example includes a transceiver 610, a processor 620, a read only memory 630, a random access memory 640, and a bus 650.

The transceiver 610 is configured to receive and transmit data.

The processor 620 controls the operation of the terminal device, and the processor 620 may also be referred to as a CPU (Central Processing). Unit, central processing unit). Processor 620 may be an integrated circuit chip with signal processing capabilities. The processor 620 can also be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), an off-the-shelf programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware component. . The general purpose processor may be a microprocessor or the processor or any conventional processor or the like.

The memory can include read only memory 630 and random access memory 640 and provides instructions and data to processor 620. A portion of the memory may also include non-volatile random access memory (NVRAM).

The various components of the data transfer device are coupled together by a bus 650, which may include, in addition to the data bus, a power bus, a control bus, a status signal bus, and the like. However, for clarity of description, various buses are labeled as bus 650 in the figure.

In the embodiment of the present invention, the processor 620 performs the following operations by calling an operation instruction stored in the memory, which can be stored in the operating system:

The processor 620 is configured to control the transceiver 610 to receive D2D communication data sent by other terminal devices.

The processor 620 is configured to determine, according to the information of the D2D communication data, the D2D communication data from the D2D Discovery transport channel; and for when the D2D communication data comes from D2D When the Discovery transport channel is based on the information of the D2D communication data and the acquired D2D service logical channel and D2D A mapping relationship of the Discovery transport channel, mapping the D2D communication data to the D2D Discovery transport channel.

Optionally, the information of the D2D communication data received by the transceiver 610 includes a bit number of the D2D communication data and/or a dedicated logical channel identifier, where the dedicated logical channel identifier is used to identify the D2D communication data from the D2D. Discovery transport channel;

The processor 620 is configured to determine, according to the information of the D2D communication data received by the transceiver 610, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, or the D2D communication data includes the dedicated logical channel When the identification, the D2D communication data is passed through the D2D The discovery channel is delivered to the medium access control protocol layer, and the D2D communication data is mapped to the D2D service logical channel at the medium access control protocol layer according to the obtained mapping relationship, where the first preset The threshold is less than or equal to the D2D The maximum number of bits carried by the Discovery transport channel, and the obtained mapping relationship is a D2D service logical channel and D2D established at the medium access control protocol layer. The mapping relationship of the Discovery transport channel.

Optionally, the information about the D2D communication data received by the transceiver 610 further includes scheduling information, where the scheduling information is used to indicate time-frequency resources used by the second D2D communication data, the D2D communication data and the second D2D The communication data is divided by the same D2D communication data packet;

The processor 620 is configured to determine, according to the information of the D2D communication data received by the transceiver 610, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, and the D2D communication data includes the dedicated logical channel And identifying, acquiring, according to the scheduling information, the second D2D communication data;

The processor 620 is further configured to pass the D2D communication data through the D2D The Discovery transport channel is delivered to the medium access control protocol layer, and the second D2D communication data is delivered to the medium access control protocol layer through the D2D shared transport channel, and the medium access control protocol layer is D2D communication data and the second D2D communication data are mapped to a D2D service logical channel;

The processor 620 is further configured to: restore, by the radio link control protocol layer, the D2D communication data mapped by the mapping module and the second D2D communication data packet to obtain a D2D communication data packet before the segmentation.

Optionally, the information of the D2D communication data received by the transceiver 610 further includes a source address and a destination address, where the source address is used to identify an address of the terminal device that sends the D2D communication data, where the destination address is used to identify An address of the terminal device receiving the D2D communication data;

The processor 620 is configured to: when the D2D communication data received from the transceiver is obtained, the data packet header of the radio link control protocol layer includes a source address and a destination address, and determine that the number of bits of the D2D communication data is less than or equal to the first Passing the D2D communication data through the D2D when a predetermined threshold or the D2D communication data includes the dedicated logical channel identifier a Discovery transport channel is delivered to the medium access control protocol layer, the D2D communication data is mapped to the ProSe protocol stack at the medium access control protocol layer; and the protocol layer and the A mapping interface between the ProSe protocol stacks, the D2D communication data is delivered to the radio link control protocol layer.

Optionally, the information of the D2D communication data received by the transceiver 610 includes a number of bits of the D2D communication data and a ProSe identifier, where the ProSe identifier is used to identify that the D2D communication data is from a data packet convergence protocol layer;

The processor 620 is configured to: when determining that the number of bits of the D2D communication data received by the transceiver 610 is less than or equal to a first preset threshold, and the D2D communication data includes the ProSe identifier, pass the D2D communication data through the D2D The Discovery transport channel is delivered to a medium access control protocol layer, the D2D communication data is mapped to the ProSe protocol stack at the medium access control protocol layer; and used to aggregate with the packet data according to the ProSe protocol stack a mapping relationship of the protocol layer, mapping the D2D communication data to the packet data convergence protocol layer.

In the above description, specific details such as specific system structures, interfaces, techniques, and the like have been presented for the purpose of illustration and description. However, it will be apparent to those skilled in the art that the present invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known devices, circuits, and methods are omitted so as not to obscure the description of the application.

Claims

A data transmission method, characterized in that the method comprises:

The terminal device establishes a mapping relationship between the D2D service logical channel and the D2D Discovery transmission channel;

Determining, by the terminal device, whether the number of bits of the first D2D communication data reaches a threshold value, wherein the first D2D communication data is D2D communication data to be transmitted;

When the first D2D communication data does not reach the threshold, the terminal device maps the first D2D communication data to the D2D according to the mapping relationship Discovery transport channel;

The terminal device transmits the first D2D communication data through the D2D Discovery transmission channel.
The method according to claim 1, wherein said terminal device establishes a D2D service logical channel and D2D The mapping relationship of the Discovery transport channel includes:

The terminal device directly establishes a D2D service logical channel and D2D at a medium access control protocol layer The mapping relationship of the Discovery transport channel; or

Setting a mapping interface between the radio link control protocol layer and the ProSe protocol stack to establish a D2D service logical channel and D2D The mapping relationship of the Discovery transport channel.
The method according to claim 2, wherein when the number of bits of the first D2D communication data does not reach the threshold, the terminal device sets the first D2D according to the mapping relationship. Communication data is mapped to the D2D The Discovery transport channel includes:

Determining, by the terminal device, that the number of bits of the first D2D communication data is less than or equal to a first preset threshold, where the first preset threshold is less than or equal to the D2D The maximum number of bits carried by the Discovery transport channel, and mapping the first D2D communication data to the D2D at the medium access control protocol layer Discovery transport channel; or

Determining, by the terminal device, that the number of bits of the first D2D communication data is less than or equal to a first preset threshold, where the first preset threshold is less than or equal to the D2D a maximum number of bits carried by the Discovery transport channel, the first D2D communication data is delivered to the ProSe protocol stack by the mapping interface, and the first D2D communication data is mapped to the medium at the medium access control protocol layer D2D Discovery transport channel.
The method of claim 3, wherein the method further comprises:

When the number of bits of the first D2D communication data is greater than the first preset threshold, the terminal device maps the first D2D communication data to a D2D shared transport channel, and transmits the D2D shared transport channel by using the D2D shared transport channel. The first D2D communication data.
The method according to claim 3 or 4, wherein the method further comprises:

When the number of bits of the first D2D communication data is greater than the first preset threshold, the terminal device divides the first D2D communication data into at least second D2D communication data at the radio link control protocol layer. And third D2D communication data; wherein the first preset threshold is equal to the D2D The maximum number of bits carried by the Discovery transport channel, the number of bits of the second D2D communication data is less than or equal to the first preset threshold, and the number of bits of the third D2D communication data is greater than the number of bits of the second D2D communication data ;

The terminal device maps the second D2D communication data to the D2D at the medium access control protocol layer Discovering a transport channel, or delivering the second D2D communication data to the ProSe protocol stack through the mapping interface;

Mapping the third D2D communication data to the D2D shared transport channel at the medium access control protocol layer.
The method according to claim 5, wherein when the number of bits of the first D2D communication data is greater than the first preset threshold, the terminal device is to be in the radio link control protocol layer After the first D2D communication data is divided into the second D2D communication data and the third D2D communication data, the second D2D communication data is mapped to the D2D at the medium access control protocol layer Before the discovery channel is delivered, or the second D2D communication data is delivered to the ProSe protocol stack by using the mapping interface, the method further includes:

Determining, by the terminal device, whether the number of bits of the third D2D communication data is greater than a second preset threshold; wherein the second preset threshold is a maximum number of bits carried by the D2D shared transport channel;

When the number of bits of the third D2D communication data is greater than the second preset threshold, the terminal device divides the third D2D communication data at the radio link control protocol layer, where the divided The number of bits of each D2D communication data is less than or equal to the second preset threshold, the second D2D communication data includes scheduling information of the third D2D communication data, and the scheduling information is used to indicate the third D2D Information on time-frequency resources used by communication data.
The method according to any one of claims 3-6, wherein the terminal device maps the first D2D communication data to the D2D according to the mapping relationship After the step of discovering the transport channel, the method further includes:

The terminal device adds a source address and a destination address to the first D2D communication data at the medium access control protocol layer or the radio link control protocol layer, and adds a dedicated logical channel identifier, where the source address is used for Identifying an address of the terminal device that sends the first D2D communication data, the destination address is used to identify an address of a terminal device that receives the first D2D communication data, and the dedicated logical channel identifier is used to identify the D2D Discovery transmits D2D communication data for the channel.
The method according to claim 1, wherein said terminal device establishes a D2D service logical channel and D2D The mapping relationship of the Discovery transport channel includes:

The terminal device sets a mapping relationship between a packet data convergence protocol layer and the ProSe protocol stack.
The method according to claim 8, wherein when the number of bits of the first D2D communication data reaches the threshold, the terminal device transmits the first D2D communication according to the mapping relationship. Data mapping to the D2D The Discovery transport channel includes:

Determining, by the terminal device, that the number of bits of the first D2D communication data is less than or equal to a first preset threshold, where the first preset threshold is less than or equal to the D2D a maximum number of bits carried by the Discovery transport channel, the first D2D communication data is delivered from the packet data convergence protocol layer to the ProSe protocol stack, a ProSe identifier is set to the first D2D communication data, and the medium is in the medium An access control protocol layer maps the first D2D communication data to the D2D Discovery transport channel.
The method of claim 8 further comprising:

When the number of bits of the first D2D communication data is greater than the first preset threshold, the terminal device delivers the first D2D communication data from the packet data convergence protocol layer to the media access control protocol And mapping the first D2D communication data to the D2D shared transport channel at the medium access control protocol layer.
A data transmission method, characterized in that the method comprises:

Receiving, by the terminal device, D2D communication data sent by another terminal device other than the terminal device;

Determining, by the terminal device, that the D2D communication data is from D2D according to the information of the D2D communication data Discovery transport channel;

The terminal device according to the information of the D2D communication data and the D2D service logical channel and D2D acquired by the terminal device A mapping relationship of the Discovery transport channel, mapping the D2D communication data to the D2D Discovery transport channel.
The method according to claim 11, wherein the information of the D2D communication data comprises a number of bits of the D2D communication data and/or a dedicated logical channel identifier, and the dedicated logical channel identifier is used to identify the D2D communication Data from D2D Discovery transport channel;

The terminal device according to the information of the D2D communication data and the D2D service logical channel and D2D acquired by the terminal device Mapping the Discovery transport channel, mapping the D2D communication data to the D2D Discovery transport channel includes:

Determining, according to the information of the D2D communication data, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, or the D2D communication data includes the dedicated logical channel identifier,

Passing the D2D communication data through the D2D The discovery channel is delivered to the medium access control protocol layer, and the D2D communication data is mapped to the D2D service logical channel at the medium access control protocol layer according to the obtained mapping relationship; wherein the first preset The threshold is less than or equal to the D2D The maximum number of bits carried by the Discovery transport channel; the obtained mapping relationship is a D2D service logical channel and D2D established at the medium access control protocol layer The mapping relationship of the Discovery transport channel.
The method according to claim 12, wherein the information of the D2D communication data further comprises scheduling information, the scheduling information is used to indicate time-frequency resources used by the second D2D communication data, and the D2D communication data and the The second D2D communication data is divided by the same D2D communication data packet;

The method further includes:

Determining, according to the information of the D2D communication data, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, and the D2D communication data includes the dedicated logical channel identifier, the terminal device according to the scheduling information Obtaining the second D2D communication data;

The terminal device passes the D2D communication data through the D2D The Discovery transport channel is delivered to the medium access control protocol layer, and the second D2D communication data is delivered to the medium access control protocol layer through the D2D shared transport channel, and the media access control is performed according to the mapping relationship The protocol layer maps the D2D communication data and the second D2D communication data to a D2D service logical channel;

The D2D communication data and the second D2D communication data packet are restored at the radio link control protocol layer to obtain a D2D communication data packet before the division.
The method according to claim 12 or 13, wherein the information of the D2D communication data further includes a source address and a destination address, where the source address is used to identify an address of the terminal device that transmits the D2D communication data, Determining an address of the terminal device for receiving the D2D communication data;

And obtaining, by the D2D communication data, a data packet header of the radio link control protocol layer, including a source address and a destination address, and determining that the number of bits of the D2D communication data is less than or equal to a first preset threshold or the D2D communication When the data includes the dedicated logical channel identifier, the terminal device passes the D2D communication data through the D2D The Discovery transport channel is delivered to the medium access control protocol layer, and the D2D communication data is mapped to the ProSe protocol stack at the medium access control protocol layer;

The terminal device delivers the D2D communication data to the radio link control protocol layer by using a mapping interface between the radio link control protocol layer and the ProSe protocol stack.
The method according to claim 11, wherein the information of the D2D communication data comprises a number of bits of the D2D communication data and a ProSe identifier, and the ProSe identifier is used to identify the D2D communication data from a data packet convergence protocol Floor;

The terminal device according to the information of the D2D communication data and the D2D service logical channel and D2D acquired by the terminal device Mapping the Discovery transport channel, mapping the D2D communication data to the D2D Discovery transport channel includes:

When determining, according to the information of the D2D communication data, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, and the D2D communication data includes the ProSe identifier, the terminal device passes the D2D communication data The D2D The Discovery transport channel is delivered to a medium access control protocol layer, and the D2D communication data is mapped to the ProSe protocol stack at the medium access control protocol layer;

And the terminal device maps the D2D communication data to the packet data convergence protocol layer according to a mapping relationship between the ProSe protocol stack and the packet data convergence protocol layer.
A data transmission device, comprising: an establishment module, a determination module, a mapping module, and a transmission module;

The establishing module is configured to establish a mapping relationship between a D2D service logical channel and a D2D Discovery transmission channel;

The determining module is configured to determine whether the number of bits of the first D2D communication data reaches a threshold value, wherein the first D2D communication data is D2D communication data to be transmitted;

The mapping module is configured to: when the determining module determines that the first D2D communication data does not reach the threshold, map the first D2D communication data to the location according to the mapping relationship established by the establishing module D2D Discovery transport channel;

The transmission module is configured to transmit the first D2D communication data by using the D2D Discovery transmission channel.
The apparatus according to claim 16, wherein the establishing module is configured to establish a D2D service logical channel and D2D directly at a medium access control protocol layer. The mapping relationship of the Discovery transport channel; or

Setting a mapping interface between the radio link control protocol layer and the ProSe protocol stack to establish a D2D service logical channel and D2D The mapping relationship of the Discovery transport channel.
The apparatus according to claim 17, wherein the mapping module is configured to: when the determining module determines that the number of bits of the first D2D communication data is less than or equal to a first preset threshold, in the media access a control protocol layer mapping the first D2D communication data to the D2D Discovery a transport channel; or submit the first D2D communication data to the ProSe protocol stack through the mapping interface to map the first D2D communication data to the D2D at the medium access control protocol layer a discovery channel: wherein the first preset threshold is less than or equal to a maximum number of bits carried by the D2D Discovery transport channel.
The apparatus according to claim 18, wherein the mapping module is further configured to: when the determining module determines that the number of bits of the first D2D communication data is greater than the first preset threshold, A D2D communication data is mapped to the D2D shared transport channel, and the first D2D communication data is transmitted through the D2D shared transport channel.
The device according to claim 18 or 19, wherein the device further comprises a segmentation module, wherein the segmentation module is configured to: when the determining module determines that the number of bits of the first D2D communication data is greater than the first When the threshold is preset, the first D2D communication data is at least divided into the second D2D communication data and the third D2D communication data at the radio link control protocol layer; wherein the first preset threshold is equal to the D2D The maximum number of bits carried by the Discovery transport channel, the number of bits of the second D2D communication data is less than or equal to the first preset threshold, and the number of bits of the third D2D communication data is greater than the number of bits of the second D2D communication data ;

The mapping module is further configured to map the second D2D communication data obtained by dividing the dividing module to the D2D at the medium access control protocol layer Discovering a transport channel, or delivering the second D2D communication data to the ProSe protocol stack through the mapping interface;

And mapping, by the medium access control protocol layer, third D2D communication data obtained by dividing the dividing module to the D2D shared transport channel.
The device according to claim 20, wherein the segmentation module is further configured to determine whether the number of bits of the third D2D communication data obtained by the segmentation is greater than a second preset threshold; wherein the second preset The threshold is the maximum number of bits carried by the D2D shared transport channel;

The segmentation module is further configured to: when the number of bits of the third D2D communication data is greater than the second preset threshold, segment the third D2D communication data at the radio link control protocol layer, where The number of bits of the divided D2D communication data is less than or equal to the second preset threshold, and the second D2D communication data includes scheduling information of the third D2D communication data, where the scheduling information is used to indicate the The information of the time-frequency resource used by the third D2D communication data.
The device according to any one of claims 18 to 21, wherein the device further comprises an information setting module, where the information setting module is at the medium access control protocol layer or the radio link control protocol layer Adding a source address and a destination address to the first D2D communication data, and adding a dedicated logical channel identifier, wherein the source address is used to identify an address of the terminal device that sends the first D2D communication data, and the destination address is used to identify Receiving an address of the terminal device of the first D2D communication data, the dedicated logical channel identifier is used to identify the D2D Discovery transmits D2D communication data for the channel.
The apparatus according to claim 16, wherein the establishing module is configured to set a mapping relationship between a packet data convergence protocol layer and the ProSe protocol stack.
The apparatus according to claim 23, wherein the mapping module is configured to: when the determining module determines that the number of bits of the first D2D communication data is less than or equal to a first preset threshold, the first D2D Transmitting data from the packet data convergence protocol layer to the ProSe protocol stack, setting a ProSe identity to the first D2D communication data, and mapping the first D2D communication data to the media access control protocol layer The D2D a discovery channel: wherein the first preset threshold is less than or equal to a maximum number of bits carried by the D2D Discovery transport channel.
The apparatus according to claim 23, wherein the mapping module is further configured to: when the determining module determines that the number of bits of the first D2D communication data is greater than the first preset threshold, A D2D communication data is delivered from the packet data convergence protocol layer to the medium access control protocol layer, and the first D2D communication data is mapped to the D2D shared transport channel at the medium access control protocol layer.
A data transmission device, comprising: a receiving module, a determining module, and a mapping module;

The receiving module is configured to receive D2D communication data sent by another terminal device;

The determining module is configured to determine, according to the information of the D2D communication data received by the receiving module, that the D2D communication data is from D2D Discovery transport channel;

The mapping module is configured to: when the determining module determines that the D2D communication data is from D2D When the Discovery transport channel is based on the information of the D2D communication data and the acquired D2D service logical channel and D2D A mapping relationship of the Discovery transport channel, mapping the D2D communication data to the D2D Discovery transport channel.
The apparatus according to claim 26, wherein the information of the D2D communication data received by the receiving module comprises a number of bits of the D2D communication data and/or a dedicated logical channel identifier, and the dedicated logical channel identifier is used. For identifying the D2D communication data from D2D Discovery transport channel;

The determining module is configured to determine, according to the information of the D2D communication data received by the receiving module, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, or the D2D communication data includes the dedicated logical channel When marking, confirm that the D2D communication data comes from D2D a discovery channel, where the first preset threshold is less than or equal to a maximum number of bits carried by the D2D Discovery transmission channel;

The mapping module is configured to pass the D2D communication data determined by the determining module to the D2D And transmitting, by the medium access control protocol layer, the D2D communication data to the D2D service logical channel, where the acquired The mapping relationship is a D2D service logical channel and D2D established at the medium access control protocol layer. The mapping relationship of the Discovery transport channel.
The device according to claim 27, wherein said device further comprises a restoration module;

The information about the D2D communication data received by the receiving module further includes scheduling information, where the scheduling information is used to indicate time-frequency resources used by the second D2D communication data, and the D2D communication data and the second D2D communication data are Segmentation of the same D2D communication packet;

The mapping module is further configured to: when the determining module determines, according to the information of the D2D communication data, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, and the D2D communication data includes the dedicated logical channel identifier Obtaining, according to the scheduling information, the second D2D communication data; and for transmitting the D2D communication data through the D2D The Discovery transport channel is delivered to the medium access control protocol layer, and the second D2D communication data is delivered to the medium access control protocol layer through the D2D shared transport channel, and the medium access control protocol layer is D2D communication data and the second D2D communication data are mapped to a D2D service logical channel;

The restoration module is configured to restore, by the radio link control protocol layer, the D2D communication data mapped by the mapping module and the second D2D communication data packet to obtain a D2D communication data packet before the division.
The device according to claim 27 or 28, wherein the information of the D2D communication data received by the receiving module further includes a source address and a destination address, where the source address is used to identify that the D2D communication data is sent. An address of the terminal device, where the destination address is used to identify an address of the terminal device that receives the D2D communication data;

The determining module is configured to: when the data packet header of the radio link control protocol layer is obtained from the D2D communication data, includes a source address and a destination address, and determine that the number of bits of the D2D communication data is less than or equal to a first preset. Confirming that the D2D communication data comes from D2D when the threshold or the D2D communication data includes the dedicated logical channel identifier Discovery transport channel;

The mapping module is configured to pass the D2D communication data determined by the determining module to the D2D a Discovery transport channel is delivered to the medium access control protocol layer, the D2D communication data is mapped to the ProSe protocol stack at the medium access control protocol layer; and the protocol layer and the A mapping interface between the ProSe protocol stacks, the D2D communication data is delivered to the radio link control protocol layer.
The device according to claim 26, wherein the information of the D2D communication data received by the receiving module 410 comprises a number of bits of the D2D communication data and a ProSe identifier, and the ProSe identifier is used to identify the D2D. Communication data comes from the data packet convergence protocol layer;

The determining module is configured to: when it is determined that the number of bits of the D2D communication data is less than or equal to a first preset threshold, and the D2D communication data includes the ProSe identifier, confirm that the D2D communication data is from D2D Discovery transport channel;

The mapping module is configured to pass the D2D communication data determined by the determining module to the D2D The Discovery transport channel is delivered to a medium access control protocol layer, the D2D communication data is mapped to the ProSe protocol stack at the medium access control protocol layer; and used to aggregate with the packet data according to the ProSe protocol stack a mapping relationship of the protocol layer, mapping the D2D communication data to the packet data convergence protocol layer.
A data transmission device, characterized in that the device comprises: a processor and a transceiver;

The processor is configured to establish a mapping relationship between a D2D service logical channel and a D2D Discovery transmission channel;

The processor is configured to determine whether a number of bits of the first D2D communication data reaches a threshold value, wherein the first D2D communication data is D2D communication data to be transmitted;

The processor is configured to map the first D2D communication data to the D2D according to the mapping relationship when determining that the first D2D communication data does not reach the threshold value Discovery a transmission channel, and transmitting the first D2D communication data through the D2D Discovery transmission channel;

The transceiver is configured to transmit and receive data.
The apparatus according to claim 31, wherein said processor is configured to establish a D2D service logical channel and D2D directly at a medium access control protocol layer The mapping relationship of the Discovery transport channel; or

Setting a mapping interface between the radio link control protocol layer and the ProSe protocol stack to establish a D2D service logical channel and D2D The mapping relationship of the Discovery transport channel.
The apparatus according to claim 32, wherein the processor is configured to: when the number of bits of the first D2D communication data is less than or equal to a first preset threshold, at the medium access control protocol layer Mapping the first D2D communication data to the D2D Discovery a transport channel; or submit the first D2D communication data to the ProSe protocol stack through the mapping interface to map the first D2D communication data to the D2D at the medium access control protocol layer a discovery channel: wherein the first preset threshold is less than or equal to a maximum number of bits carried by the D2D Discovery transport channel.
The device according to claim 33, wherein the processor is further configured to: when the number of bits of the first D2D communication data is greater than the first preset threshold, map the first D2D communication data And transmitting, by the D2D shared transport channel, the first D2D communication data to a D2D shared transport channel.
The apparatus according to claim 33 or 34, wherein the processor is further configured to: when the number of bits of the first D2D communication data is greater than the first preset threshold, in the radio link control The protocol layer divides the first D2D communication data into at least second D2D communication data and third D2D communication data; wherein the first preset threshold is equal to the D2D The maximum number of bits carried by the Discovery transport channel, the number of bits of the second D2D communication data is less than or equal to the first preset threshold, and the number of bits of the third D2D communication data is greater than the number of bits of the second D2D communication data ;

The processor is further configured to map the second D2D communication data to the D2D at the medium access control protocol layer Discovering a transport channel, or delivering the second D2D communication data to the ProSe protocol stack through the mapping interface;

Mapping the third D2D communication data to the D2D shared transport channel at the medium access control protocol layer.
The device according to claim 35, wherein the processor is further configured to determine whether the number of bits of the third D2D communication data is greater than a second preset threshold; wherein the second preset threshold is Describe the maximum number of bits carried by the D2D shared transport channel;

The processor is further configured to: when the number of bits of the third D2D communication data is greater than the second preset threshold, segment the third D2D communication data at the radio link control protocol layer, where The number of bits of the divided D2D communication data is less than or equal to the second preset threshold, and the second D2D communication data includes scheduling information of the third D2D communication data, where the scheduling information is used to indicate the The information of the time-frequency resource used by the third D2D communication data.
The device according to any one of claims 33 to 36, wherein the processor is further configured to add the first D2D communication data at the medium access control protocol layer or the radio link control protocol layer. a source address and a destination address, and a dedicated logical channel identifier, wherein the source address is used to identify an address of a terminal device that sends the first D2D communication data, and the destination address is used to identify that the first D2D communication is received The address of the terminal device of the data, the dedicated logical channel identifier is used to identify the D2D Discovery transmits D2D communication data for the channel.
The apparatus according to claim 31, wherein the processor is configured to set a mapping relationship between a packet data convergence protocol layer and the ProSe protocol stack.
The apparatus according to claim 38, wherein said processor is configured to: when said number of bits of said first D2D communication data is less than or equal to a first predetermined threshold, said first D2D communication data from said packet a data convergence protocol layer is submitted to the ProSe protocol stack, a ProSe identity is set for the first D2D communication data, and the first D2D communication data is mapped to the D2D at the media access control protocol layer a discovery channel: wherein the first preset threshold is less than or equal to a maximum number of bits carried by the D2D Discovery transport channel.
The device according to claim 38, wherein the processor is further configured to: when the number of bits of the first D2D communication data is greater than the first preset threshold, the first D2D communication data is The packet data convergence protocol layer is delivered to the medium access control protocol layer, and the first D2D communication data is mapped to the D2D shared transport channel at the medium access control protocol layer.
A data transmission device, characterized in that the device comprises a transceiver and a processor;

The transceiver is configured to receive D2D communication data sent by other terminal devices;

The processor is configured to determine, according to the information of the D2D communication data, the D2D communication data from D2D Discovery transport channel; and for when the D2D communication data comes from D2D When the Discovery transport channel is based on the information of the D2D communication data and the acquired D2D service logical channel and D2D A mapping relationship of the Discovery transport channel, mapping the D2D communication data to the D2D Discovery transport channel.
The apparatus according to claim 41, wherein said information of said D2D communication data received by said transceiver comprises a number of bits of said D2D communication data and/or a dedicated logical channel identifier, said dedicated logical channel identification For identifying the D2D communication data from D2D Discovery transport channel;

The processor is configured to determine, according to the information of the D2D communication data received by the transceiver, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, or the D2D communication data includes the dedicated logical channel identifier Passing the D2D communication data through the D2D The discovery channel is delivered to the medium access control protocol layer, and the D2D communication data is mapped to the D2D service logical channel at the medium access control protocol layer according to the obtained mapping relationship, where the first preset The threshold is less than or equal to the D2D The maximum number of bits carried by the Discovery transport channel; the obtained mapping relationship is a D2D service logical channel and D2D established at the medium access control protocol layer The mapping relationship of the Discovery transport channel.
The device according to claim 42, wherein the information of the D2D communication data received by the transceiver further comprises scheduling information, where the scheduling information is used to indicate a time-frequency resource used by the second D2D communication data. Decoding the D2D communication data and the second D2D communication data by the same D2D communication data packet;

The processor is configured to determine, according to the information of the D2D communication data received by the transceiver, that the number of bits of the D2D communication data is less than or equal to a first preset threshold, and the D2D communication data includes the dedicated logical channel identifier Obtaining, according to the scheduling information, the second D2D communication data;

The processor is further configured to pass the D2D communication data through the D2D The Discovery transport channel is delivered to the medium access control protocol layer, and the second D2D communication data is delivered to the medium access control protocol layer through the D2D shared transport channel, and the medium access control protocol layer is D2D communication data and the second D2D communication data are mapped to a D2D service logical channel;

The processor is further configured to: at the radio link control protocol layer, restore the D2D communication data mapped by the mapping module and the second D2D communication data packet to obtain a D2D communication data packet before segmentation.
The device according to claim 42 or 43, wherein the information of the D2D communication data received by the transceiver further comprises a source address and a destination address, wherein the source address is used to identify that the D2D communication data is sent. An address of the terminal device, where the destination address is used to identify an address of the terminal device that receives the D2D communication data;

The processor is configured to: when the D2D communication data received from the transceiver is acquired, the data packet header of the radio link control protocol layer includes a source address and a destination address, and determine that the number of bits of the D2D communication data is less than or equal to the first Passing the D2D communication data through the D2D when a predetermined threshold or the D2D communication data includes the dedicated logical channel identifier a Discovery transport channel is delivered to the medium access control protocol layer, the D2D communication data is mapped to the ProSe protocol stack at the medium access control protocol layer; and the protocol layer and the A mapping interface between the ProSe protocol stacks, the D2D communication data is delivered to the radio link control protocol layer.
The apparatus according to claim 42, wherein the information of the D2D communication data received by the transceiver comprises a number of bits of the D2D communication data and a ProSe identifier, and the ProSe identifier is used to identify the D2D communication The data comes from the data packet convergence protocol layer;

The processor is configured to: when determining that the number of bits of D2D communication data received by the transceiver is less than or equal to a first preset threshold, and the D2D communication data includes the ProSe identifier, pass the D2D communication data to the D2D The Discovery transport channel is delivered to a medium access control protocol layer, the D2D communication data is mapped to the ProSe protocol stack at the medium access control protocol layer; and used to aggregate with the packet data according to the ProSe protocol stack a mapping relationship of the protocol layer, mapping the D2D communication data to the packet data convergence protocol layer.