TW201731312A - Method and apparatus of data transmission for vehicle-to-vehicle communication - Google Patents

Abstract

Embodiments of the present disclosure provide a method of data transmission for vehicle-to-vehicle communication, comprising: in response to an arrival of a media access control (MAC) packet at a physical layer, selecting a sub-period for transmitting data in a scheduling assignment period, in the selected sub-period, selecting a transmission pattern for transmitting the data; and in the selected sub-period, transmitting the data with the selected transmission pattern. Moreover, embodiments of the present disclosure also relate to an apparatus of data transmission for vehicle-to-vehicle communication.

Description

Method and apparatus for data transmission for inter-vehicle communication

Embodiments of the present disclosure are directed to the field of communications, and more particularly to a method and apparatus for data transmission for inter-vehicle communication.

In 2015, a new research project on Vehicle-to-External (V2X, Vehicle to X) services based on Long Term Evolution (LTE) in 3GPP was launched to research and explore LTE-based networks based on extensive development. The opportunity of the road's vehicle industry's "connected car". The LTE-based V2X study consists of three parts: V2V (Vehicle to Vehicle), Vehicle to Pedestrians (V2P), and Vehicle to Infrastructure/Network (V2I/N). The V2V service covers inter-vehicle via direct air intermediaries (eg, PC5 interface defined in Device to Device for LTE Release 12/13) or via an indirect null interfacing via eNB relay. The focus of the present disclosure is on V2V communication for direct null interfacing.

However, D2D direct communication dedicated to LTE version 12/13 is not Can be effectively used for V2V communication. Therefore, there is a need for an enhanced function built into D2D direct communication for implementing V2V communication in LTE.

In view of the above problems existing in the prior art, embodiments of the present disclosure are directed to a method and apparatus for data transmission for inter-vehicle communication for realizing an adjustable packet generation rate in a physical layer and enhancing for V2V Broadcast performance of communication.

A first aspect of the present disclosure provides a method for data transmission for inter-vehicle communication, comprising: selecting a sub-period for transmitting the data in a scheduling allocation period when there is a MAC packet arriving at a physical layer; In the selected sub-period, a transmission mode for transmitting the material is selected; and in the selected sub-period, the data is transmitted in the selected transmission mode.

According to an exemplary embodiment of the present disclosure, wherein selecting a sub-period for transmitting the material in a scheduling allocation period comprises randomly selecting a sub-period for transmitting the material.

According to an exemplary embodiment of the present disclosure, wherein selecting a sub-period for transmitting the material in a scheduling allocation period comprises selecting a sub-period for transmitting the material based on sensing.

According to an exemplary embodiment of the present disclosure, the selecting a sub-period for transmitting the material based on sensing includes: reading scheduling allocation information from other vehicle user devices, and/or sensing entity side link sharing The energy level of the channel.

According to an exemplary embodiment of the present disclosure, in the selected sub-period, selecting a transmission mode for transmitting the material includes randomly selecting a transmission for transmitting the material in the selected sub-period mode.

According to an exemplary embodiment of the present disclosure, in the selected sub-period, selecting a transmission mode for transmitting the material includes: selecting, in the selected sub-period, for transmitting the data based on sensing Transmission mode.

According to an exemplary embodiment of the present disclosure, the selecting a transmission mode for transmitting the material based on sensing includes: reading scheduling allocation information from other vehicle user devices, and/or sensing entity side link sharing The energy level of the channel.

According to an exemplary embodiment of the present disclosure, the sub-period for selecting the data to be transmitted in the scheduling allocation period further includes: according to the number of times the MAC packet is transmitted at the physical layer and the predetermined transmission in the sub-period A subset of the modes determining the number of sub-cycles for transmitting the data in the scheduled allocation period.

According to an exemplary embodiment of the present disclosure, wherein, in the selected sub-period, selecting a transmission mode for transmitting the material comprises: selecting, in each selected sub-period, a subframe for transmitting the material .

According to an exemplary embodiment of the present disclosure, the subframes selected for transmitting the material in each of the selected sub-cycles are the same.

According to an exemplary embodiment of the present disclosure, the subframes selected for transmitting the material in each of the selected sub-cycles are different.

According to an exemplary embodiment of the present disclosure, when there is a MAC packet arriving at the physical layer, selecting a sub-period for transmitting the material in a scheduling allocation period includes: sensing based on a MAC packet arriving at the physical layer And determining whether the congestion degree of the data resource pool in the scheduling allocation period is greater than a threshold; and when the congestion degree is less than the threshold, selecting a sub-cycle for transmitting the data in the scheduling allocation period.

A second aspect of the present disclosure provides an apparatus for data transmission for inter-vehicle communication, comprising: a first selection unit configured to select for transmission in a scheduling allocation period when there is a MAC packet arriving at a physical layer a sub-period of the data; a second selection unit configured to select a transmission mode for transmitting the material in the selected sub-period; and a transmission unit configured to be in the selected sub-period The selected transmission mode transmits the data.

According to an exemplary embodiment of the present disclosure, the first selection unit is further configured to randomly select a sub-period for transmitting the material.

According to an exemplary embodiment of the present disclosure, wherein the first selection unit is further configured to: select a sub-period for transmitting the material based on sensing.

In accordance with an exemplary embodiment of the present disclosure, the first selection unit is further configured to: read scheduling assignment information from other vehicle user devices, and/or sense an energy level of the physical side link shared channel.

According to an exemplary embodiment of the present disclosure, wherein the second selection The unit is further configured to randomly select a transmission mode for transmitting the material in the selected sub-period.

According to an exemplary embodiment of the present disclosure, the second selection unit is further configured to: select, in the selected sub-period, a transmission mode for transmitting the material based on sensing.

In accordance with an exemplary embodiment of the present disclosure, the second selection unit is further configured to: read scheduling assignment information from other vehicle user devices, and/or sense an energy level of the physical side link shared channel.

According to an exemplary embodiment of the present disclosure, the first selection unit is further configured to: determine, according to a number of times the MAC packet is transmitted at a physical layer and a subset of a predetermined transmission mode in the sub-period, The number of sub-cycles used to transmit the data in the scheduling allocation period.

According to an exemplary embodiment of the present disclosure, the second selection unit is further configured to: select, in each selected sub-period, a subframe for transmitting the material.

According to an exemplary embodiment of the present disclosure, the subframes selected for transmitting the material in each of the selected sub-cycles are the same.

According to an exemplary embodiment of the present disclosure, the subframes selected for transmitting the material in each of the selected sub-cycles are different.

According to an exemplary embodiment of the present disclosure, the first selection unit is further configured to: determine, according to the sensing, a congestion degree of a data resource pool in the scheduling allocation period when there is a MAC packet arriving at the physical layer Whether it is greater than a threshold; and when the congestion degree is less than the threshold, A sub-period for transmitting the data is selected in the scheduling allocation period.

500‧‧‧Devices for data transmission for inter-vehicle communication

510‧‧‧First choice unit

520‧‧‧Second selection unit

530‧‧‧Transportation unit

The drawings described herein are provided to provide a further understanding of the present disclosure, which is a part of the present disclosure, and the description of the present disclosure and the description thereof are not intended to limit the disclosure.

FIG. 1 illustrates a flow chart of a method for data transfer for inter-vehicle communication, in accordance with one embodiment of the present disclosure.

2 shows a schematic diagram of a frame architecture for D2D direct communication in LTE Release 12.

FIG. 3 shows a schematic diagram of a frame architecture for V2V communication, in accordance with an embodiment of the present disclosure.

4 shows a schematic diagram of a frame architecture for broadcasting transmissions of a vehicle user device, in accordance with an embodiment of the present disclosure.

FIG. 5 illustrates a schematic diagram of an apparatus for data transmission for inter-vehicle communication, in accordance with an embodiment of the present disclosure.

The principles of the present disclosure are described below with reference to a few exemplary embodiments illustrated in the drawings. It is to be understood that the description of the embodiments is merely intended to provide a better understanding of the invention, and is not intended to limit the scope of the disclosure.

FIG. 1 illustrates a flow diagram of a method 100 for data transfer for inter-vehicle communication, in accordance with one embodiment of the present disclosure. Specifically, in the steps S101. When there is a MAC packet arriving at the physical layer, select a sub-period for transmitting data in a scheduling allocation period. Next, in step S102, in the selected sub-period, a transmission mode for transmitting data is selected. Finally, in step S103, the data is transmitted in the selected transmission mode in the selected sub-period.

Advantageously, in step S101 of method 100, when there is a MAC packet arriving at the physical layer, it may be determined based on the sensing whether the congestion level of the data resource pool in the scheduling allocation period is greater than a threshold. When the congestion degree is less than the threshold, a sub-period for transmitting data is selected in the scheduling allocation period. Once the congestion level is greater than the threshold that the data resource pool can withstand, the vehicle user equipment can discard the MAC to remain silent, that is, no data transmission.

It should be noted that determining whether the congestion of the data resource pool in the scheduling allocation period is greater than a threshold based on the sensing may be implemented in the following two manners. One method is to read scheduling allocations from other vehicle user equipments. Information, the second method is to sense the energy level of the shared channel of the physical side link. It should be noted that any one of the two methods can be used for sensing, and the two sensing methods can be simultaneously performed.

Once it is determined that the congestion degree is less than the threshold, then data transmission is performed. In step S101 of method 100, a sub-period for transmitting data can be randomly selected.

Advantageously, in step S101 of method 100, a sub-period for transmitting material is selected based on the sensing.

Further advantageously, in step S101 of method 100, based on The sensing to select the sub-period for transmitting data can be implemented in two ways, one is to read scheduling allocation information from other vehicle user equipment, and the second method is to sense the physical side link shared channel. Energy level. It should be noted that any one of the two methods can be used for sensing, and the two sensing methods can be simultaneously performed.

Next, in step S102 of method 100, a transmission mode for transmitting data is randomly selected in the selected sub-period.

Advantageously, in the selected sub-period, a transmission mode for transmitting the material is selected based on the sensing.

Further advantageously, in step S102 of method 100, selecting a transmission mode for transmitting the material based on sensing may be implemented in two ways, one method of reading scheduling assignments from other vehicle user devices. Information, the second method is to sense the energy level of the shared channel of the physical side link. It should be noted that any one of the two methods can be used for sensing, and the two sensing methods can be simultaneously performed.

Those skilled in the art will appreciate that based on the results of the sensing in steps S101 and S102 of method 100, the vehicle user device can identify the resources used by the adjacent user equipment for transmission. In order to avoid possible conflicts or to reduce the effects of interference due to in-band leakage, the vehicle user equipment can use the sub-period with the lowest congestion in the scheduling allocation period and/or the sub-frames in the sub-period for data transmission. .

Further, in step S101 of the method 100, determining, according to the number of times the MAC packet is transmitted at the physical layer and a subset of the predetermined transmission mode in the sub-period, the sub-segment for transmitting the data in the scheduling allocation period week The number of periods.

In step S102 of method 100, a subframe for transmitting material is selected in each of the selected sub-cycles. The subframes selected for transmitting the material in each of the selected sub-cycles are the same or different.

Next, the sub-period partitioning and selection in the scheduling allocation period and the selection of the transmission mode in the scheduling architecture for V2V communication according to an embodiment of the present invention are further explained with reference to FIGS. 2 through 4.

2 shows a schematic diagram of a frame architecture for D2D direct communication in LTE Release 12. Referring to FIG. 2, as specified in LTE Release 12, the physical side link control channel (the control channel to transmit scheduling information (SA)) and the physical side link shared channel (data channel) are based on the physical resource pool periodicity. The pre-configured duration SA resource pool and data resource pool are periodically repeated as shown in FIG. 2. The transmission of each data is arranged by the SA. The user equipment responsible for receiving can know the time and frequency of data transmission after decoding the corresponding SA. In FIG. 2, each scheduling allocation period has 40 subframes, where SA occupies 8 subframes and data occupies 32 subframes. In LTE Release 12, the specific transmission mode for data includes three subsets, namely (8, k), where k = 1, 2, 4, which means that the user equipment responsible for transmission selects among 8 subframes. k subframes are used for transmission.

FIG. 3 shows a schematic diagram of a frame architecture for V2V communication, in accordance with an embodiment of the present disclosure. Referring to FIG. 3, FIG. 2 shows that the D2D data resource pool in the scheduling allocation period is divided into sub-cycles of a plurality of 8 subframes, which is The length of the transmission mode is 8. Since in FIG. 2, the data in the scheduling allocation period occupies the length of 32 subframes, the data resource pool is divided into 4 sub-cycles.

It should be noted that the number of sub-cycles in which the data resource pool is divided depends on the number of subframes in the entire scheduling allocation period. The data resource pool in the scheduling allocation period shown in FIG. 3 is divided into four sub-cycles only as one. An example, not a limitation on the number of sub-cycles.

4 shows a schematic diagram of a frame architecture for broadcasting transmissions of a vehicle user device, in accordance with an embodiment of the present disclosure.

For broadcast vehicle user equipment, the number of sub-cycles selected for transmission of data in a scheduling allocation period depends on the number of times the MAC packet is transmitted on the physical layer and a subset of the predetermined transmission mode. Referring to the schematic diagram shown in FIG. 4, in the case where the MAC packet is transmitted twice on the physical layer and the subset of the transmission mode is configured as (8, 1), only 1 subframe is used for transmission in each sub-period. Therefore, the number of sub-cycles selected for transmitting data is 2. It should be noted that for scenarios covered in the network, a subset of the transmission modes is configured by the eNB, and for scenarios outside the network, the transmission mode can be reserved. Those skilled in the art can understand that when the subframe of the transmission mode is configured as (8, 1), the number of sub-cycles selected for transmission is equal to the number of times the MAC is transmitted in the physical layer, where the MAC is in the entity. The number of transmissions in the layer can be 1, 2, 3 or 4 times.

After determining the number of sub-cycles for transmitting data, it is possible to decide which sub-periods to select for transmitting data based on the sensing. For example in Figure 4 As shown in the figure, the first and third sub-cycles are selected for data transmission. These two sub-cycles are labeled as Tx and remain silent on the second and fourth sub-cycles. Marked as Silent.

Optionally, the same or different transmission modes may be selected in each selected sub-cycle, that is, the same or different subframes for transmitting data may be selected. Selecting a repeating transmission mode for the sub-period in the scheduling allocation period simplifies SA signaling, but sacrifices performance. Conversely, selecting different transmission modes for sub-cycles in the scheduling allocation period requires more SA signaling, but with better performance. The performance advantages provided by the different transmission modes over the sub-period are due to the increased time domain mode available over the entire data portion of the scheduling allocation period.

FIG. 5 illustrates a schematic diagram of an apparatus for data transmission for inter-vehicle communication, in accordance with an embodiment of the present disclosure. As shown in FIG. 5, the apparatus 500 for data transmission of inter-vehicle communication includes: a first selecting unit 510 configured to select, during a scheduling allocation period, data for transmitting data when there is a MAC packet arriving at the physical layer. a sub-period; a second selection unit 520 configured to select a transmission mode for transmitting data in the selected sub-period; and a transmission unit 530 configured to select the transmission in the selected sub-period Mode transfer data.

Optionally, the first selection unit 510 is further configured to: randomly select a sub-period for transmitting data.

Advantageously, wherein the first selection unit 510 is further configured to: select a sub-period for transmitting material based on the sensing.

Advantageously, wherein the first selection unit 510 is further configured to: read The scheduling allocation information from other vehicle user equipments is taken and/or the energy level of the physical side link shared channel is sensed.

Optionally, the second selection unit 520 is further configured to randomly select a transmission mode for transmitting the data in the selected sub-period.

Advantageously, the second selection unit 520 is further configured to select a transmission mode for transmitting data based on the sensing in the selected sub-period.

Advantageously, the second selection unit 520 is further configured to: read scheduling assignment information from other vehicle user devices, and/or sense an energy level of the physical side link shared channel.

Furthermore, the first selection unit 510 is further configured to determine the number of sub-cycles for transmitting data in the scheduling allocation period based on the number of times the MAC packet is transmitted in the physical layer and the subset of the predetermined transmission mode in the sub-period.

The second selection unit 520 is further configured to select a subframe for transmitting the material in each of the selected sub-cycles. The subframes selected for transmitting the data in each selected sub-cycle are the same or different.

Advantageously, the first selecting unit 510 is further configured to: when there is a MAC packet arriving at the physical layer, determine, based on the sensing, whether the congestion level of the data resource pool in the scheduling allocation period is greater than a threshold; and when the congestion degree is less than a threshold The sub-cycle for transmitting data is selected in the scheduling allocation period.

In summary, the method and apparatus for data transmission for inter-vehicle communication through embodiments of the present disclosure can achieve a rate of adjustable packet generation in a physical layer and enhance broadcast performance for V2V communication.

The above description is only an alternative embodiment of the present disclosure, and is not intended to limit the disclosure, and various changes and modifications may be made to the present disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the present disclosure are intended to be included within the scope of the present disclosure.

Claims (15)

A method for data transmission for inter-vehicle communication, comprising: selecting a sub-period for transmitting the data in a scheduling allocation period when there is a MAC packet arriving at the physical layer; in the selected sub-period, selecting for Transmitting the transmission mode of the data; and transmitting the data in the selected transmission mode in the selected sub-period. The method of claim 1, wherein selecting a sub-period for transmitting the material in a scheduling allocation period comprises randomly selecting a sub-period for transmitting the material. The method of claim 1, wherein selecting a sub-period for transmitting the material in a scheduling allocation period comprises selecting a sub-period for transmitting the material based on sensing. The method of claim 1, wherein in the selected sub-period, selecting a transmission mode for transmitting the data comprises: randomly selecting a transmission for transmitting the data in the selected sub-period mode. The method of claim 1, wherein in the selected sub-period, selecting a transmission mode for transmitting the data comprises: selecting, based on the sensing, for transmitting the data in the selected sub-period Transmission mode. The method of claim 1, wherein the selecting a sub-cycle for transmitting the data in the scheduling allocation period further comprises: The number of sub-cycles for transmitting the data in the scheduled allocation period is determined according to the number of times the MAC packet is transmitted at the physical layer and the subset of the predetermined transmission mode in the sub-cycle. The method of claim 1, wherein in the selected sub-period, selecting a transmission mode for transmitting the data comprises: selecting, in each selected sub-period, a subframe for transmitting the material . The method of claim 1, wherein when there is a MAC packet arriving at the physical layer, selecting a sub-period for transmitting the data in the scheduling allocation period comprises: when there is a MAC packet arriving at the physical layer, based on The sensing determines whether the congestion level of the data resource pool in the scheduling allocation period is greater than a threshold; and when the congestion degree is less than the threshold, selecting a sub-period for transmitting the data in the scheduling allocation period. An apparatus for data transmission for inter-vehicle communication, comprising: a first selecting unit configured to select a sub-period for transmitting the data in a scheduling allocation period when there is a MAC packet arriving at the physical layer; a unit configured to select a transmission mode for transmitting the material in the selected sub-period; and a transmission unit configured to transmit the data in the selected transmission mode in the selected sub-period. The device of claim 9, wherein the first selection unit is further configured to: A sub-cycle for transmitting the material is randomly selected. The device of claim 9, wherein the first selection unit is further configured to: select a sub-period for transmitting the material based on the sensing. The apparatus of claim 9, wherein the second selection unit is further configured to randomly select a transmission mode for transmitting the material in the selected sub-period. The apparatus of claim 9, wherein the second selection unit is further configured to: select, in the selected sub-period, a transmission mode for transmitting the material based on the sensing. The apparatus of claim 9, wherein the first selection unit is further configured to: determine, based on a number of times the MAC packet is transmitted at the physical layer and a subset of the predetermined transmission mode in the sub-cycle The number of sub-cycles used to transmit the data in the scheduling allocation period. The apparatus of claim 9, wherein the second selection unit is further configured to: select a subframe for transmitting the material in each of the selected sub-cycles.