WO2017075919A1

WO2017075919A1 - Data transmission method and device for vehicle communications, terminal, and road side unit

Info

Publication number: WO2017075919A1
Application number: PCT/CN2016/072860
Authority: WO
Inventors: 雷艺学; 张云飞
Original assignee: 宇龙计算机通信科技(深圳)有限公司
Priority date: 2015-11-05
Filing date: 2016-01-29
Publication date: 2017-05-11
Also published as: CN105282257B; CN105282257A

Abstract

The present invention provides a data transmission method and device for vehicle communications, terminal, and road side unit. The data transmission method for vehicle communications comprises: determining a range where data sent by a sending terminal is allowed to reach, a location distribution condition of receiving terminals in a coverage area of a base station, and a signal coverage area of a road side unit serving as a relay of the sending terminal to communicate with the base station; and selecting, according to the range where the data is allowed to reach, the location distribution condition of the receiving terminals, and the signal coverage area of the road side unit, a data transmission method to transmit the data sent by the sending terminal to the receiving terminals. The technical solution of the present invention can reduce a latency of data transmission as much as possible in the case where a Uu interface and a PC5 interface are used together to perform V2V transmission, thereby optimizing the overall V2V data transmission efficiency.

Description

Data transmission method and device, vehicle and roadside unit for vehicle communication

Technical field

The present invention relates to the field of communications technologies, and in particular, to a data transmission method for vehicle communication, a data transmission device for vehicle communication, a terminal, and a roadside unit.

Background technique

V2X (Vehicle to X, vehicle-to-target communication) is a project approved by 3GPP RAN#68, and mainly studies vehicle data transmission scheme based on 3GPP communication protocol. The V2X includes V2V (Vehicle to Vehicle), V2P (Vehicle to Individual Person), V2I (Vehicle to Infrastructure), and the like. In principle, the V2V communication can be performed through the Uu interface (the interface between the user equipment and the base station) and the PC5 interface (the interface between the user equipment and the user equipment). The existing downlink transmission mechanism includes the Uu interface unicast. The UuMS (Enhanced Multimedia Broadcast Multicast Service), that is, the multi-cell broadcast service support, and the single-cell broadcast mechanism, that is, the Single-Cell PTM (Point to Multi-point).

For the scenario of V2V transmission using the combination of the Uu interface and the PC5 interface, as shown in FIG. 1, the transmitting vehicle 102 first transmits the V2V data to the RSU (Road Side Unit) through the PC5 interface, that is, the secondary link (SL, sidelink). The side unit 106, then the RSU transmits the data to the base station 104 through the UL, and then the eNB transmits the unicast or broadcast to the vehicle terminal covered by the one or more macro cells (ie, the vehicle terminal shown in FIG. 1). 108. Vehicle terminal 110 and vehicle terminal 112).

In this scenario, the carrier frequency of the D2D communication, the carrier frequency of the uplink transmission, and the carrier frequency of the downlink transmission may belong to the same or different operators. If the D2D communication carrier and the downlink transmission operator belong to the same carrier or belong to different operators, they can perform cross-carrier frequency connection. When receiving and transmitting, there will be unnecessary delay and repeated reception of the terminal on V2V data transmission.

Specifically, in the scenario shown in FIG. 1, if the vehicle receiving the data through the broadcast mechanism is within the SL transmission range of the transmitting vehicle, more than one data transmission may be received. This will have the following problems:

1. Unnecessary delay transmission. The vehicle terminal located within the transmission range of the SL does not need to be forwarded to the eNB (base station) through the RSU and then to the receiving end. Such delay is unnecessary and a mechanism is needed to avoid. For example, UE#1 is located within the SL transmission range of the transmitting UE, and it is not necessary to relay to the base station through the RSU to perform downlink broadcast or multicast transmission.

2. If redundant transmissions have occurred, the receiving vehicle needs mechanisms to avoid repeated reception, avoiding unnecessary data being forwarded to the application layer after receiving it. For example, in the scenario shown in FIG. 1, the vehicle terminal 108 may receive two pieces of data, one SL from the transmitting vehicle 102 being directly transmitted, and the other from the base station 104 relayed by the RSU 106 being downlinked. Since the RSU 106 forwards to the base station 104 and the base station 104 even needs to go through the core network entity when performing downlink broadcasts, the extra delay introduced may be as much as 50-100 ms or more.

Therefore, how to minimize the delay of data transmission in the scenario of U2 interface and PC5 interface combination for V2V transmission becomes a technical problem to be solved.

Summary of the invention

The present invention is based on at least one of the above technical problems, and proposes a new data transmission scheme for vehicle communication, which can reduce the time of data transmission in a scenario where V2V transmission is performed by using a Uu interface and a PC5 interface combination. The delay optimizes the overall transmission efficiency of V2V data.

In view of this, the present invention provides a data transmission method for vehicle communication, including: determining a range in which data transmitted by a transmitting terminal can reach, a location distribution of a receiving terminal within a coverage of a base station, and transmitting the same as the transmitting And a signal coverage range of the roadside unit that communicates with the base station by the terminal; selecting a location according to the range that the data can reach, the location distribution of the receiving terminal, and the signal coverage of the roadside unit The data transmission mode in which the data transmitted by the transmitting terminal is transmitted to the receiving terminal.

In this technical solution, since the delay of the method of directly transmitting by the transmitting terminal is the smallest, the method of forwarding by the wayside unit is followed, and the method of transmitting by the wayside unit and transmitting by the base station has the largest delay, so According to the range that the data sent by the transmitting terminal can reach, the location distribution of the receiving terminal, and the signal coverage of the roadside unit, the data transmission mode for transmitting the data sent by the transmitting terminal to the receiving terminal is selected, so that the priority is relatively preferred. Small transmission mode for transmission, for example, when the receiving terminal is within the range in which the data transmitted by the transmitting terminal can reach, the mode directly transmitted by the receiving terminal can be preferentially selected, thereby realizing the V2V transmission using the combination of the Uu interface and the PC5 interface. In the scenario, the delay of data transmission is reduced as much as possible, and the overall transmission efficiency of V2V data is optimized.

In the above technical solution, preferably, the step of selecting a data transmission manner for transmitting data sent by the transmitting terminal to the receiving terminal includes: a range that can be reached according to the data, and a location distribution of the receiving terminal. a case, determining, in the receiving terminal, a first terminal that is within a range that the data can reach and a second terminal that is outside a range that the data can reach; and selecting a data transmission manner directly sent by the sending terminal Transmitting data sent by the transmitting terminal to the first terminal.

In this technical solution, since the delay of the method of directly transmitting by the transmitting terminal is the smallest, the first terminal within the range that the data transmitted by the transmitting terminal can reach can adopt the data transmission manner directly transmitted by the transmitting terminal. To ensure the minimum transmission delay.

In any one of the foregoing technical solutions, preferably, the step of transmitting the data transmission manner of the data sent by the sending terminal to the receiving terminal, specifically, further comprising: according to the signal coverage range of the roadside unit and the Receiving a location distribution of the terminal, determining a third terminal in the second terminal that is within the signal coverage of the roadside unit; and selecting a data transmission manner forwarded by the roadside unit to send the sending terminal Data is transmitted to the third terminal.

In this technical solution, since the data transmission delay in the manner of forwarding by the roadside unit is only the delay of the method of directly transmitting by the transmitting terminal, it is outside the range that the data transmitted by the transmitting terminal can reach. The second terminal may determine the third terminal that is within the signal coverage of the roadside unit to select to transmit the data sent by the transmitting terminal to the third terminal by way of the roadside unit forwarding, so as to reduce the transmission time as much as possible. Delay.

In any of the above technical solutions, preferably, the data transmitted by the sending terminal is selected. The step of transmitting the data transmission mode to the receiving terminal specifically includes: selecting, by the roadside unit, forwarding data sent by the sending terminal to the base station, and transmitting, by the base station, a data transmission manner The data transmitted by the transmitting terminal is transmitted to other terminals in the second terminal that are outside the signal coverage range of the roadside unit.

In this technical solution, for other terminals that are not in the range that the data transmitted by the transmitting terminal can reach, and are not in the coverage of the roadside unit, in order to ensure that the data transmitted by the transmitting terminal can be received, the roadside unit can be selected. Forwarded to the base station, the data transmission mode transmitted by the base station.

In any one of the foregoing technical solutions, the method further includes: when receiving the data directly sent by the sending terminal, the receiving terminal records a message serial number and/or timestamp information of the data directly sent by the sending terminal; When the receiving terminal receives the data sent by the base station, according to the sequence number and/or timestamp information of the data sent by the base station, and the message sequence number and/or timestamp information of the data directly sent by the sending terminal. Determining whether the data sent by the base station and the data directly sent by the sending terminal are the same data; the receiving terminal discards receiving when determining that the data sent by the base station and the data directly sent by the sending terminal are the same data The data sent by the base station.

In this technical solution, since the roadside unit forwards to the base station, the delay of the data transmission manner forwarded by the base station to the receiving terminal is greater than the delay of the manner in which the transmitting terminal directly transmits to the receiving terminal, so the receiving terminal passes the recording and transmitting terminal. The message sequence number and/or timestamp information of the directly sent data, combined with the message sequence number and/or timestamp information of the data sent by the base station, determines that when the same data is received from the base station, the data sent by the received base station is discarded, which can be avoided. The receiving terminal repeatedly receives the same data.

According to a second aspect of the present invention, a data transmission apparatus for vehicle communication is further provided, comprising: a first determining unit, configured to determine a range in which data transmitted by the transmitting terminal can reach, and receive within a coverage of the base station a location distribution of the terminal, and a signal coverage range of the roadside unit that communicates with the base station as a relay of the transmitting terminal; a data transmission unit, configured to be reachable according to the data, and the receiving terminal The location distribution situation and the signal coverage of the roadside unit select a data transmission mode for transmitting data transmitted by the transmitting terminal to the receiving terminal.

In the above technical solution, preferably, the data transmission unit includes: a second determining unit, configured to determine, according to a range that the data can reach and a location distribution of the receiving terminal, that the receiving terminal is in the a first terminal within a range reachable by the data and a second terminal outside the range in which the data can reach; a selecting unit configured to select a data transmission manner directly sent by the transmitting terminal to send the transmitting terminal The data is transmitted to the first terminal.

In any one of the foregoing technical solutions, the second determining unit is further configured to determine, according to a signal coverage range of the roadside unit and a location distribution of the receiving terminal, that the second terminal is located in the second terminal. a third terminal that is within the signal coverage of the roadside unit; the selection unit is further configured to: select, by the data transmission manner forwarded by the roadside unit, transmit data sent by the sending terminal to the third terminal .

In any one of the above technical solutions, preferably, the selecting unit is further configured to select by the The roadside unit forwards the data sent by the sending terminal to the base station, and transmits data sent by the sending terminal to the second terminal in the roadside unit by a data transmission manner sent by the base station. Other terminals outside the signal coverage.

In any one of the above aspects, preferably, the method further includes: a recording unit, configured to record, when the receiving terminal receives the data directly sent by the sending terminal, a message serial number of the data directly sent by the sending terminal, and/or Or a timestamp information; a determining unit, configured to: when the receiving terminal receives the data sent by the base station, according to a sequence number and/or timestamp information of the data sent by the base station, and directly sent by the sending terminal a message sequence number and/or timestamp information of the data, determining whether the data sent by the base station and the data directly sent by the sending terminal are the same data; and the processing unit, configured to determine, by the determining unit, the data sent by the base station When the data directly sent by the transmitting terminal is the same data, the data sent by the base station received by the receiving terminal is discarded.

According to a third aspect of the present invention, a terminal, comprising: a data transmission device for vehicle communication according to any of the above embodiments; a receiving unit, configured to receive the transmission by the roadside unit And the first determining unit is configured to determine, according to the notification information received by the receiving unit, a location distribution of the receiving terminal and a signal coverage range of the roadside unit.

In the technical solution, when the data transmission mode is selected by the terminal, the roadside unit is required to notify the terminal of the location distribution of the receiving terminal and the signal coverage of the roadside unit, where The roadside unit can interact with the base station to obtain a location distribution to the receiving terminal.

According to a fourth aspect of the present invention, there is further provided a roadside unit, comprising: a data transmission device for vehicle communication according to any of the above embodiments; a receiving unit, configured to receive the transmission by the transmitting terminal First notification information and second notification information sent by the base station; the first determining unit is configured to determine, according to the first notification information received by the receiving unit, that data sent by the sending terminal can reach And a range for determining a location distribution of the receiving terminal according to the second notification information received by the receiving unit.

In this technical solution, when the data transmission mode is selected by the roadside unit, the transmitting terminal is required to notify the roadside unit of the range in which the data transmitted by the transmitting terminal can reach, and the base station is required to notify the roadside of the location distribution of the receiving terminal. unit.

Through the above technical solution, in the scenario of using the Uu interface and the PC5 interface to perform V2V transmission, the delay of data transmission can be reduced as much as possible, and the overall transmission efficiency of the V2V data is optimized.

DRAWINGS

FIG. 1 is a schematic diagram of a scenario in which V2V transmission is performed by using a combination of a Uu interface and a PC5 interface;

2 shows a schematic flow chart of a data transmission method for vehicle communication in accordance with one embodiment of the present invention;

3 shows a schematic block diagram of a data transmission device for vehicle communication in accordance with one embodiment of the present invention;

4 shows a schematic block diagram of a data transmission device for vehicle communication in accordance with another embodiment of the present invention;

Figure 5 shows a schematic block diagram of a terminal in accordance with an embodiment of the present invention;

Figure 6 shows a schematic block diagram of a roadside unit in accordance with an embodiment of the present invention;

FIG. 7 shows a schematic flow chart of a data transmission method for vehicle communication in accordance with another embodiment of the present invention.

detailed description

The present invention will be further described in detail below with reference to the drawings and specific embodiments. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a full understanding of the invention, but the invention may be practiced otherwise than as described herein. Limitations of the embodiments.

2 shows a schematic flow chart of a data transmission method for vehicle communication in accordance with one embodiment of the present invention.

As shown in FIG. 2, a data transmission method for vehicle communication according to an embodiment of the present invention includes:

Step 202: Determine a range in which data transmitted by the transmitting terminal can reach, a location distribution of the receiving terminal in the coverage of the base station, and a signal coverage range of the roadside unit that communicates with the base station as a relay of the transmitting terminal. ;

Step 204: Select, according to the range that the data can reach, the location distribution of the receiving terminal, and the signal coverage of the roadside unit, select a data transmission manner to transmit data sent by the sending terminal to the receiving terminal. .

In the above technical solution, preferably, the step of selecting a data transmission manner for transmitting data sent by the transmitting terminal to the receiving terminal includes: a range that can be reached according to the data, and a location distribution of the receiving terminal. Case, determining that the receiving terminal is in the number And transmitting, according to a data transmission manner directly sent by the transmitting terminal, data transmitted by the transmitting terminal to the second terminal within a range that can be reached and a second terminal that is outside the range that the data can reach; The first terminal is described.

In any one of the foregoing technical solutions, the step of transmitting the data sent by the sending terminal to the data transmission mode of the receiving terminal is selected, and the method further includes: selecting, by the roadside unit, sending the sending terminal The data is forwarded to the base station, and the data transmission manner sent by the base station transmits data sent by the sending terminal to other terminals in the second terminal that are outside the signal coverage range of the roadside unit.

In any one of the foregoing technical solutions, the method further includes: when receiving the data directly sent by the sending terminal, the receiving terminal records a message serial number and/or timestamp information of the data directly sent by the sending terminal; When the receiving terminal receives the data sent by the base station, according to the serial number and/or timestamp information of the data sent by the base station, and the sending terminal Determining, by the message sequence number and/or the timestamp information of the directly sent data, whether the data sent by the base station and the data directly sent by the sending terminal are the same data; the receiving terminal determining the data sent by the base station and the When the data directly transmitted by the transmitting terminal is the same data, the received data sent by the base station is discarded.

Figure 3 shows a schematic block diagram of a data transmission device for vehicle communication in accordance with one embodiment of the present invention.

As shown in FIG. 3, a data transmission apparatus 300 for vehicle communication according to an embodiment of the present invention includes a first determination unit 302 and a data transmission unit 304.

The first determining unit 302 is configured to determine a range that the data sent by the sending terminal can reach, a location distribution of the receiving terminal that is within the coverage of the base station, and communicate with the base station as a relay of the sending terminal. Signal coverage of the roadside unit;

The data transmission unit 304 is configured to select, according to the range that the data can reach, the location distribution of the receiving terminal, and the signal coverage of the roadside unit, to transmit data sent by the sending terminal to the receiving terminal. The way data is transmitted.

In the above technical solution, preferably, the data transmission unit 304 includes: a second determining unit 3042, configured to determine that the receiving terminal is located according to a range that the data can reach and a location distribution of the receiving terminal a first terminal within a range reachable by the data and a second terminal outside a range in which the data can reach; a selecting unit 3044, configured to select a data transmission manner directly sent by the transmitting terminal The data transmitted by the transmitting terminal is transmitted to the first terminal.

In any one of the foregoing technical solutions, the second determining unit 3042 is further configured to determine that the second terminal is located according to a signal coverage range of the roadside unit and a location distribution of the receiving terminal. a third terminal within the signal coverage of the roadside unit; the selection unit 3044 is further configured to: select, by the data transmission manner forwarded by the roadside unit, transmit data sent by the sending terminal to the first Three terminals.

In any one of the foregoing technical solutions, preferably, the selecting unit 3044 is further configured to: select, by the roadside unit, forward data sent by the sending terminal to the base station, and transmit data transmitted by the base station. And transmitting, by the manner, the data sent by the sending terminal to other terminals in the second terminal that are outside the signal coverage range of the roadside unit.

In any one of the foregoing technical solutions, the method further includes: a recording unit 306, configured to record the sending terminal directly when the receiving terminal receives the data directly sent by the sending terminal a message sequence number and/or timestamp information of the transmitted data; a determining unit 308, configured to: according to the sequence number and/or timestamp of the data sent by the base station, when the receiving terminal receives the data sent by the base station And determining, by the message sequence number and/or the timestamp information of the data directly sent by the sending terminal, whether the data sent by the base station and the data directly sent by the sending terminal are the same data; the processing unit 310 is configured to The determining unit 308 determines that the data transmitted by the base station and the data directly transmitted by the transmitting terminal are the same data, and discards the data transmitted by the base station received by the receiving terminal.

4 shows a schematic block diagram of a data transmission device for vehicle communication in accordance with another embodiment of the present invention.

As shown in FIG. 4, a data transmission apparatus 400 for vehicle communication according to another embodiment of the present invention includes: a first determination unit 302 and a data transmission unit 304 shown in FIG.

In this technical solution, since the delay of the method of directly transmitting by the transmitting terminal is the smallest, the method of forwarding by the wayside unit is followed, and the method of transmitting by the wayside unit and transmitting by the base station has the largest delay, so According to the range that the data sent by the transmitting terminal can reach, the location distribution of the receiving terminal, and the signal coverage of the roadside unit, the data transmission mode for transmitting the data sent by the transmitting terminal to the receiving terminal is selected, so that the priority is relatively preferred. Small transmission mode for transmission, such as data transmitted by the receiving terminal at the transmitting terminal When the reachable range is reached, the mode directly transmitted by the receiving terminal can be preferentially selected, thereby realizing the reduction of the delay of data transmission and optimizing the V2V data in the scenario of using the Uu interface and the PC5 interface combination for V2V transmission. Overall transmission efficiency.

In this technical solution, for other terminals that are not in the range that the data transmitted by the transmitting terminal can reach, and are not in the coverage of the roadside unit, in order to ensure that the data transmitted by the transmitting terminal can be received, the roadside unit can be selected. Forwarded to the base station, the data transmitted by the base station transfer method.

FIG. 5 shows a schematic block diagram of a terminal in accordance with an embodiment of the present invention.

As shown in FIG. 5, a terminal 500 according to an embodiment of the present invention includes: a data transmission device 400 for vehicle communication as shown in FIG. 4; and a receiving unit 502, configured to receive a notification sent by the roadside unit The first determining unit 302 is configured to determine, according to the notification information received by the receiving unit 402, a location distribution of the receiving terminal and a signal coverage of the roadside unit.

In this technical solution, when the data transmission mode is selected by the terminal, the roadside unit is required to notify the terminal of the location distribution of the receiving terminal and the signal coverage of the roadside unit, wherein the roadside unit can interact with the base station. To obtain the location distribution of the receiving terminal.

Figure 6 shows a schematic block diagram of a roadside unit in accordance with an embodiment of the present invention.

As shown in FIG. 6, a roadside unit 600 according to an embodiment of the present invention includes: a data transmission device 400 for vehicle communication as shown in FIG. 4; and a receiving unit 602, configured to receive the transmission by the transmitting terminal First notification information and second notification information sent by the base station; the first determining unit 302 is configured to determine, according to the first notification information received by the receiving unit 602, that the data sent by the sending terminal can a range of arrivals, and is used to determine a location distribution of the receiving terminal according to the second notification information received by the receiving unit 602.

In summary, the technical solution of the present invention mainly proposes a data transmission scheme for adaptively selecting SL or Uu interface forwarding, so as to minimize the delay of data in the transmission process. Meanwhile, when redundant transmission occurs, the receiving terminal can introduce a detection mechanism of V2V duplicate data to prevent unnecessary data from being delivered to the application layer.

Specifically, the technical solution of the present invention mainly determines how to select a suitable transmission mode to forward V2V data in three modes: direct transmission by the transmitting terminal, RSU relay transmission, and RSU relay + eNB (base station) downlink transmission. The sender's judgment is based on the possible range of SL transmission (within the allowed transmit power range) Ds, the coverage range Dr of the RSU, and the distribution of the receiving terminals covered by the base station. The basic method of discrimination is as follows:

If the receiving terminal is in the Ds, the receiving terminal in the Ds adopts the direct transmission mode of the SL (that is, the manner in which the sending terminal directly transmits);

For the receiving terminal outside the Ds, if there is a receiving terminal in the Dr, the data is transmitted by using the RSU relay transmission method;

For a receiving terminal that is neither in Ds nor in Dr, data can be transmitted in the manner of RSU relay + eNB.

The execution entity of the above selection logic may be a terminal or an RSU:

If the terminal is to perform, the RSU is required to obtain the vehicle distribution information (ie, the distribution information of the receiving terminal) within the coverage of the base station and notify the terminal, and the specific notification manner may adopt the D2D transmission mode. When the RSU notifies the terminal distribution information of the vehicle within the coverage of the base station, the RSU may use the user plane data instead of the control plane signaling to reduce the complexity of the standardization. In addition, the method may be pre-configured to the terminal by using a method similar to an offline map. The coverage information of different base stations may exist in the terminal, and the terminal uses the geographical location information or the identifier information of the RSU to determine.

If the RSU is to be executed, the vehicle distribution information needs to be exchanged between the RSU and the base station, and the transmission coverage of the transmitting terminal needs to be notified to the RSU. The transmitting terminal may not use explicit signaling when notifying the RSU, because the maximum transmit power may depend on the type of the terminal and the frequency band used. Preferably, the information is that the RSU can be found in the UE and sidelink synchronization is performed. Time to get it.

The present invention also proposes a mechanism to avoid repeated reception by the receiving terminal. specifically:

The receiving terminal saves the information of the transmitting terminal and the message sequence number (or timestamp) when receiving the SL direct transmission data. After the data arriving through the path of the RSU relay + eNB is received by the receiving terminal, the receiving terminal determines whether it is the same data by using the originating information and the message sequence number (or timestamp), and if so, discarding the processing without determining that Replay.

It should be noted that the data transmitted by the SL and the data transmitted by the eNB may be from carrier frequencies of different operators, and whether the data is redundantly transmitted needs to be able to be used in multiple carrier frequencies.

In another embodiment of the present invention, it is assumed that the receiving terminal has the following location distribution: all within the SL transmission range of the transmitting terminal; all are within the coverage of the RSU, but are not in the transmission range The SL transmission range of the sending terminal is neither within the SL transmission range of the transmitting terminal nor within the coverage of the RSU. Then, as shown in FIG. 7, a data transmission method for vehicle communication according to another embodiment of the present invention includes:

In step 702, the transmitting terminal has V2V data to be sent.

Step 704: Whether the SL transmission range of the transmitting terminal can completely cover the receiving terminal, and if yes, execute step 706; otherwise, execute step 708.

In step 706, the SL is sent directly to avoid unnecessary delays.

In step 708, it is determined whether the RSU relay range can cover the receiving terminal. If yes, step 712 is performed; otherwise, step 710 is performed.

In step 710, the RSU relay + eNB is selected for transmission.

In step 712, the RSU relay is selected for transmission.

The technical solution of the foregoing embodiment of the present invention can avoid unnecessary transmission delay and possible repeated data reception in the V2V transmission scenario used by the combination of the PC5 interface and the Uu interface, and optimize the overall transmission efficiency of the V2V data.

The technical solution of the present invention is described in detail above with reference to the accompanying drawings. The present invention proposes a new data transmission scheme for vehicle communication, which can reduce data as much as possible in a scenario where V2V transmission is performed by using a combination of a Uu interface and a PC5 interface. The transmission delay optimizes the overall transmission efficiency of V2V data.

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

Claims

A data transmission method for vehicle communication, comprising:

Determining a range in which data transmitted by the transmitting terminal can reach, a location distribution of the receiving terminal in the coverage of the base station, and a signal coverage range of the roadside unit that communicates with the base station as a relay of the transmitting terminal;

Selecting a data transmission mode for transmitting data transmitted by the transmitting terminal to the receiving terminal according to a range that the data can reach, a location distribution of the receiving terminal, and a signal coverage of the roadside unit.
The data transmission method for vehicle communication according to claim 1, wherein the step of selecting a data transmission mode for transmitting data transmitted by the transmitting terminal to the receiving terminal comprises:

Determining, according to a range that the data can reach and a location distribution of the receiving terminal, a first terminal in the receiving terminal that is within a range that the data can reach and is outside a range that the data can reach Second terminal;

And selecting, by the data transmission manner directly sent by the sending terminal, transmitting data sent by the sending terminal to the first terminal.
The data transmission method for vehicular communication according to claim 2, wherein the step of transmitting data transmitted by the transmitting terminal to the data transmission mode of the receiving terminal, specifically comprising:

Determining, according to the signal coverage range of the roadside unit and the location distribution of the receiving terminal, a third terminal in the second terminal that is within the signal coverage of the roadside unit;

And selecting, by the data transmission manner forwarded by the roadside unit, the data sent by the sending terminal to the third terminal.
The data transmission method for vehicle communication according to claim 3, wherein the step of transmitting data transmitted by the transmitting terminal to the data transmission mode of the receiving terminal, specifically comprising:

Selecting, by the roadside unit, forwarding data sent by the sending terminal to the base station, and transmitting, by the data transmission manner sent by the base station, data sent by the sending terminal to the first The other terminals in the second terminal are outside the signal coverage range of the roadside unit.
The data transmission method for vehicle communication according to any one of claims 1 to 4, further comprising:

Receiving, by the receiving terminal, the message serial number and/or timestamp information of the data directly sent by the sending terminal, when receiving the data directly sent by the sending terminal;

When the receiving terminal receives the data sent by the base station, according to the sequence number and/or timestamp information of the data sent by the base station, and the message sequence number and/or timestamp information of the data directly sent by the sending terminal. Determining whether the data sent by the base station and the data directly sent by the sending terminal are the same data;

When the receiving terminal determines that the data sent by the base station and the data directly sent by the transmitting terminal are the same data, the receiving terminal discards the received data sent by the base station.
A data transmission device for vehicle communication, comprising:

a first determining unit, configured to determine a range that the data sent by the transmitting terminal can reach, a location distribution of the receiving terminal that is within the coverage of the base station, and a road side that communicates with the base station as a relay of the sending terminal The signal coverage of the unit;

a data transmission unit, configured to select, according to a range that the data can reach, a location distribution of the receiving terminal, and a signal coverage of the roadside unit, to transmit data sent by the sending terminal to the receiving terminal Data transmission method.
The data transmission device for vehicle communication according to claim 6, wherein the data transmission unit comprises:

a second determining unit, configured to determine, according to a range that the data can reach and a location distribution of the receiving terminal, a first terminal that is within a range that the data can reach in the receiving terminal, and is in the data a second terminal outside the reachable range;

And a selecting unit, configured to select, by using a data transmission manner directly sent by the sending terminal, to transmit data sent by the sending terminal to the first terminal.
A data transmission apparatus for vehicle communication according to claim 7, wherein:

The second determining unit is further configured to determine, according to a signal coverage range of the roadside unit and a location distribution of the receiving terminal, a signal of the second terminal in the roadside unit a third terminal within the coverage;

The selecting unit is further configured to: select, by the data transmission manner forwarded by the roadside unit, to transmit data sent by the sending terminal to the third terminal.
A data transmission apparatus for vehicle communication according to claim 8, wherein:

The selecting unit is further configured to: forward, by the roadside unit, data sent by the sending terminal to the base station, and transmit, by using a data transmission manner sent by the base station, data sent by the sending terminal to the The other terminal in the second terminal that is outside the signal coverage range of the roadside unit.
The data transmission device for vehicle communication according to any one of claims 6 to 9, further comprising:

a recording unit, configured to record, when the receiving terminal receives the data directly sent by the sending terminal, message sequence number and/or timestamp information of the data directly sent by the sending terminal;

a judging unit, configured to: according to the sequence number and/or timestamp information of the data sent by the base station, and the message sequence number of the data directly sent by the sending terminal, when the receiving terminal receives the data sent by the base station And/or timestamp information, determining whether the data sent by the base station and the data directly sent by the sending terminal are the same data;

The processing unit is configured to discard the data sent by the base station received by the receiving terminal when the determining unit determines that the data sent by the base station and the data directly sent by the sending terminal are the same data.
A terminal, comprising:

A data transmission device for vehicle communication according to any one of claims 6 to 9;

a receiving unit, configured to receive notification information sent by the roadside unit;

The first determining unit is specifically configured to determine, according to the notification information received by the receiving unit, a location distribution of the receiving terminal and a signal coverage range of the roadside unit.
A roadside unit, comprising:

A data transmission device for vehicle communication according to any one of claims 6 to 9;

a receiving unit, configured to receive first notification information sent by the sending terminal and second notification information sent by the base station;

The first determining unit is configured to determine, according to the first notification information that is received by the receiving unit, a range that the data sent by the sending terminal can reach, and is used to receive, according to the receiving unit, the first And two notification information, determining a location distribution of the receiving terminal.