CN108377545B - Wireless synchronization method of road side unit, road side equipment and system - Google Patents
Wireless synchronization method of road side unit, road side equipment and system Download PDFInfo
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Abstract
The invention provides a wireless synchronization method, a roadside device and a system for a roadside unit, wherein the wireless synchronization method for the roadside unit comprises the steps that a first road side device (RSU) sends a first synchronization signal to a second RSU and generates a second synchronization signal at the same time, the frequency points set by the first RSU and the second RSU are the same, the first RSU is a master mode device, the second RSU is a slave mode device, and the first RSU sends dedicated short range communication technology (DSRC) data after acquiring the second synchronization signal. The method provided by the invention carries out data synchronization on a plurality of RSUs in the same group in a wireless mode, does not need threading among lanes, is more convenient and faster, and reduces the cost.
Description
Technical Field
The invention relates to the field of intelligent transportation, in particular to a road side unit wireless synchronization method, road side equipment and a system.
Background
An Electronic Toll Collection (ETC) is the most advanced road and bridge Toll Collection mode in the world at present. Through the special short-range communication of microwave between the vehicle-mounted electronic tag installed on the vehicle windshield and the microwave antenna on the ETC lane of the toll station, the computer networking technology and the bank are utilized to carry out background settlement processing, so that the aim of paying the road and bridge fees of the vehicle through the road and bridge toll station without parking is fulfilled. With the rapid development of ETC, the ETC user amount breaks through 5000 ten thousand, the ETC multi-lane number also increases rapidly, the problem of lane-approaching interference is gradually increased, and the lane-approaching interference may cause repeated charging or non-charging. Therefore, it is necessary to synchronize the data of the road-side units in the lane system.
In the prior art, roadside devices (Road Side units, RSUs for Short) of each lane are connected in a threading manner to perform data synchronization of Dedicated Short Range Communications (DSRC for Short), which is not convenient and fast enough and has high cost.
Disclosure of Invention
The invention provides a wireless synchronization method of road side units, road side equipment and a system, which are used for synchronizing DSRC data of a plurality of RSUs in the same group in a wireless mode without threading among lanes, are more convenient and faster and reduce the cost.
In a first aspect, the present invention provides a method for wireless synchronization of a road side unit, where the method includes:
a first RSU sends a first synchronization signal to a second RSU and generates a second synchronization signal, wherein the frequency points set by the first RSU and the second RSU are the same, and the first RSU is a master mode device and the second RSU is a slave mode device;
the first RSU transmits DSRC data after acquiring the second synchronization signal.
Further, before the first RSU sends the first synchronization signal to the second RSU and generates the second synchronization signal, the method further includes:
and the frequency point set by the first RSU is the same as the frequency point set by the second RSU.
Further, the method further comprises: the first RSU and the second RSU are RSUs of adjacent lanes.
In a second aspect, the present invention provides a method for wireless synchronization of a road side unit, the method comprising:
a second RSU receives a first synchronization signal sent by a first RSU, wherein the frequency points set by the first RSU and the second RSU are the same, and the first RSU is a master mode device and the second RSU is a slave mode device;
the second RSU generates a second synchronization signal when receiving the first synchronization signal;
the second RSU transmits DSRC data after acquiring the second synchronization signal.
Further, before the second RSU receives the first synchronization signal sent by the first RSU, the method further includes:
and the frequency point set by the second RSU is the same as the frequency point set by the first RSU.
Further, the method further comprises: the first RSU and the second RSU are RSUs of adjacent lanes.
In a third aspect, the present invention further provides a road side unit wireless synchronization system, where the system includes multiple RSUs, the multiple RSUs are divided into multiple groups, frequency points set by the RSUs in each group are different, and frequency points set by the RSUs in the same group are the same; one group of the methods comprises: the first RSU and the second RSU have the same frequency point, and the first RSU is a master mode device and the second RSU is a slave mode device;
the first RSU sends a first synchronization signal to the second RSU and generates a second synchronization signal;
the second RSU generates a second synchronization signal when receiving the first synchronization signal;
the first RSU and the second RSU transmit DSRC data simultaneously in accordance with the second synchronization signal.
Further, before the first RSU sends the first synchronization signal to the second RSU and generates the second synchronization signal, the method further includes:
the first RSU is further configured to set a frequency point of the first RSU to be the same as a frequency point of the second RSU.
In a fourth aspect, the present invention further provides a roadside device, where the roadside device RSU is a master mode device, including:
the device comprises a sending module, a receiving module and a sending module, wherein the sending module is used for sending a first synchronization signal to a second RSU, the RSU and the second RSU are set with the same frequency point, and the second RSU is a slave mode device;
a generating module, configured to generate a second synchronization signal when the sending module sends the first synchronization signal;
the sending module is further configured to send DSRC data after acquiring the second synchronization signal.
Optionally, the roadside apparatus further includes:
and the setting module is used for setting the frequency point of the first RSU to be the same as the frequency point of the second RSU before the sending module sends the first synchronous signal to the second RSU and generates the second synchronous signal.
Optionally, the first RSU and the second RSU are RSUs of adjacent lanes.
In a fifth aspect, the present invention further provides a roadside apparatus, where the roadside apparatus RSU is a slave mode apparatus, including:
a receiving module, configured to receive a first synchronization signal sent by a first RSU, where the frequency points set by the first RSU and the second RSU are the same, and the first RSU is a master mode device;
a generating module, configured to generate a second synchronization signal when the receiving module receives the first synchronization signal;
and the sending module is used for sending DSRC data after the second synchronous signal is acquired.
Optionally, the roadside apparatus further includes:
and the setting module is used for setting the frequency point of the second RSU to be the same as the frequency point of the first RSU before the receiving module receives the first synchronization signal sent by the first RSU.
Optionally, the second RSU and the first RSU are RSUs of adjacent lanes.
In the wireless synchronization method, the roadside device and the system of the roadside unit provided by the invention, firstly, a plurality of RSUs in the system are grouped, and the same group comprises the RSU in a master mode and the RSU in a slave mode, wherein the RSU in the master mode sends a first synchronization signal to the RSU in the slave mode and simultaneously generates a second synchronization signal, the RSU in the slave mode receives the first synchronization signal and simultaneously generates the second synchronization signal, and then the RSU in the master mode and the RSU in the slave mode simultaneously send DSRC data according to the second synchronization signal. Therefore, DSRC data synchronization is carried out on the RSU of each lane in the ETC system in a wireless mode, the operation is more convenient and faster, threading is not needed, and the cost is reduced.
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In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the description below are some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a road side unit wireless synchronization system provided in the present invention;
fig. 2 is a flowchart of a first embodiment of a method for wireless synchronization of a rsu according to the present invention;
fig. 3 is a flowchart of a second embodiment of a method for wireless synchronization of a rsu according to the present invention;
fig. 4 is a schematic structural diagram of a first embodiment of a road side unit wireless synchronization system provided in the present invention;
fig. 5 is a schematic structural diagram of a second embodiment of the road side unit wireless synchronization system provided in the present invention;
FIG. 6 is a schematic structural diagram of a roadside apparatus according to a first embodiment of the present invention;
FIG. 7 is a schematic structural diagram of a second embodiment of roadside apparatus provided by the present invention;
FIG. 8 is a schematic diagram of a third structure of an embodiment of the roadside apparatus provided by the present invention;
fig. 9 is a schematic structural diagram of a fourth roadside apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a road side unit wireless synchronization system provided in the present invention.
As shown in fig. 1, the RSU wireless synchronization system 101 includes a plurality of RSUs 102, the RSUs 102 are divided into a plurality of groups, the frequency points of the RSUs in each group are different, and the frequency points of the RSUs in the same group are the same.
It should be noted that, in the road side unit wireless synchronization system provided by the present invention, when the system includes a plurality of RSUs, the RSUs are divided into a plurality of groups, each group may determine the number of RSUs according to the actual situation, and is not necessarily limited to grouping in a uniform grouping manner, and each group may include one master mode device and may include one or more slave mode devices.
See, for example, the system shown in FIG. 1: the wireless synchronization system 101 of the road side unit comprises four ETC lanes, namely four RSUs 102, wherein the four RSUs 102 are respectively RSU-1, RSU-2, RSU-3 and RSU-4, the RSU-1 and the RSU-2 are divided into a first group, the RSU-3 and the RSU-4 are divided into a second group, the first group of RSU-1 and the RSU-2 are set to be frequency points 1, the second group of RSU-3 and the RSU-4 are set to be frequency points 2, the frequency points of the RSU-1 and the RSU-2 are the same, and the frequency points of the RSU-1, the RSU-3 and the RSU-4 are different; the RSU-3 and the RSU-4 have the same frequency point, and the RSU-3, the RSU-1 and the RSU-2 have different frequency points. As a first set of examples, RSU-1 is the master mode device and RSU-2 is the slave mode device.
The two groups of RSUs are respectively set to different frequency points, so that the different groups cannot interfere with each other.
In the first group, RSU-1 sends a first synchronization signal to RSU-2, and simultaneously generates a second synchronization signal;
the RSU-2 generates a second synchronous signal when receiving the first synchronous signal;
the RSU-1 and the RSU-2 simultaneously transmit dedicated short range communication technology DSRC data according to the second synchronization signal.
The RSU-1 and the RSU-2 in the same group are wirelessly synchronized, and further the RSU-3 and the RSU-4 in the second group are also wirelessly synchronized. Because the frequency points set by each group are different, the interference between the frequency points is avoided.
Fig. 2 is a flowchart of a first embodiment of a method for wireless synchronization of a rsu according to the present invention, as shown in fig. 2, the method of this embodiment may include:
step S201, a first road side device RSU sends a first synchronization signal to a second RSU and generates a second synchronization signal, where the frequency points set by the first RSU and the second RSU are the same, the first RSU is a master mode device, and the second RSU is a slave mode device.
It should be noted that only one RSU in a group can be set as a master mode device, and one or more RSUs can be set as slave mode devices. The master mode RSU transmits the first synchronization signal to the other slave mode RSUs without receiving the first synchronization signal transmitted by the master mode RSU in the other group, and all the slave mode RSUs in the same group can receive the same synchronization signal transmitted by the master mode RSU in the group without transmitting the first synchronization signal.
In this embodiment, the first RSU and the second RSU are RSU units in the same group, and the first RSU is a master mode device and the second RSU is a slave mode device. The first RSU transmits the first synchronization signal to the second RSU without receiving the first synchronization signals transmitted by the other RSUs.
Specifically, the first RSU broadcasts and transmits a first synchronization signal to the second RSU in a microwave mode at regular time, and meanwhile generates a second synchronization signal. The first RSU sends the first synchronization signal to the second RSU, and then generates the second synchronization signal, which is generally smaller than a preset threshold due to a short interval time, for example: the predetermined threshold is chosen to be 70 microseconds, and thus, the second synchronization signal is considered to be generated simultaneously.
Further, before the first RSU sends the first synchronization signal to the second RSU and generates the second synchronization signal, the method further includes: the frequency point set by the first RSU is the same as the frequency point set by the second RSU.
Optionally, the RSU may support 125 frequency points. The frequency point may be one of 125 frequency points supported by the RSU, where the 125 frequency points are 125 frequency points that are arranged in ascending order and have an interval frequency of 1MHz from 2.400GHz to 2.524GHz, for example: frequency point 1 is 2.400GHz, frequency point 2 is 2.401GHz, and frequency point 3 is 2.402 GHz.
The frequency point set by the first RSU is the same as the frequency point of the second RSU, that is, the frequency parameter of the first synchronization signal is set. In this embodiment, the frequency point of the first RSU and the frequency point of the second RSU are set to be the same frequency point, which ensures that the slave mode RSU in the same group can only receive the first synchronization signal sent by the master mode RSU in the group, and because the frequency points of the first synchronization signal in different groups are different, the first synchronization signal sent by the RSUs in other groups cannot be received. And further, the method can ensure that the RSUs in the same group are subjected to data synchronization, and because the frequency points of different groups are different, interference cannot be generated among different groups.
Step S202, after acquiring the second synchronization signal, the first RSU transmits DSRC data.
Specifically, the first RSU may transmit DSRC data in a 5.8GHz microwave manner. At present, DSRC communication standards adopted by various countries are different, namely, systems, frequency bands, modulation modes and the like are different. For example, the DSRC communication technology in china uses the 5.725GHz to 5.850GHz band as the common band for the wireless automatic identification system of vehicles. For the application of DSRC technology to ETC systems, two transmission channels are specified, channel 1 being 5.830GHz and channel 2 being 5.840 GHz.
In the wireless synchronization method for the roadside units provided in this embodiment, the RSUs in the same group generate the second synchronization signal at the same time by sending the first synchronization signal, and the RSUs in the slave mode receive the second synchronization signal generated by receiving the first synchronization signal, so that all RSUs in the system can acquire the second synchronization signal at the same time, and then all roadside devices can synchronously send DSRC data. Carry out data synchronization to a plurality of RSUs in the same group through wireless mode, convenient and fast more need not carry out the threading, has reduced the cost.
Fig. 3 is a flowchart of a second embodiment of a method for wireless synchronization of a rsu according to the present invention, as shown in fig. 2, the method of this embodiment may include:
step S301, the second RSU receives the first synchronization signal sent by the first RSU.
The first RSU and the second RSU have the same set frequency point, and the first RSU is a master mode device and the second RSU is a slave mode device.
It should be noted that only one RSU in a group can be set as a master mode device, and one or more RSUs can be set as slave mode devices. The master mode RSU transmits the first synchronization signal to the other slave mode RSUs without receiving the first synchronization signal transmitted by the master mode RSU in the other group, and all the slave mode RSUs in the same group can receive the same synchronization signal transmitted by the master mode RSU in the group without transmitting the first synchronization signal.
In this embodiment, the first RSU and the second RSU are RSU units in the same group, and the first RSU is a master mode device and the second RSU is a slave mode device. The second RSU receives only the first synchronization signal transmitted by the first RSU and does not transmit the first synchronization signal to the other RSUs.
Further, before the second RSU receives the first synchronization signal transmitted by the first RSU, the method further includes: and the frequency point set by the second RSU is the same as the frequency point set by the first RSU.
Optionally, the RSU may support 125 frequency points. The frequency point may be one of 125 frequency points supported by the RSU, where the 125 frequency points are 125 frequency points that are arranged in ascending order and have an interval frequency of 1MHz from 2.400GHz to 2.524GHz, for example: frequency point 1 is 2.400GHz, frequency point 2 is 2.401GHz, and frequency point 3 is 2.402 GHz.
The frequency point set by the second RSU is the same as the frequency point of the first RSU, that is, the frequency of the first synchronization signal is set. In this embodiment, the frequency point of the second RSU and the frequency point of the first RSU are set to be the same frequency point, which ensures that the slave mode RSU in the same group can only receive the first synchronization signal sent by the master mode RSU in the group, and because the frequency points of the first synchronization signal in different groups are different, the first synchronization signal sent by the RSUs in other groups cannot be received. And further, the method can ensure that the RSUs in the same group are subjected to data synchronization, and because the frequency points of different groups are different, interference cannot be generated among different groups.
Step S202, when the second RSU receives the first synchronization signal, a second synchronization signal is generated.
Specifically, after receiving the first synchronization signal, the second RSU first analyzes the first synchronization signal, determines whether a received signal parameter matches a frequency point parameter set by the second RSU, and if so, may determine that the received signal is the first synchronization signal, and then the second RSU generates a second synchronization signal; if there is no match, the received signal may be an interference signal, and the second RSU does not perform any operation or processing, i.e., does not need to generate the second synchronization signal.
And step S303, after the second RSU acquires the second synchronous signal, the second RSU sends DSRC data.
Specifically, the second RSU transmits DSRC data in a 5.8G microwave manner. At present, DSRC communication standards adopted by various countries are different, namely, systems, frequency bands, modulation modes and the like are different. For example, the DSRC communication technology in china uses the 5.725GHz to 5.850GHz band as the common band for the wireless automatic identification system of vehicles. For the application of DSRC technology in ETC systems, two transmitting channels are specified in China, wherein the channel 1 is 5.830GHz, and the channel 2 is 5.840 GHz.
In the wireless synchronization method for the road side unit provided in this embodiment, the slave mode RSU receives the first synchronization signal transmitted by the same group of the master mode RSUs and generates the second synchronization signal, and simultaneously, the DSRC data is synchronously transmitted according to the obtained second synchronization signal. Through wireless mode to a plurality of RSU data synchronization in the same group, convenient and fast more need not carry out the threading, has reduced the cost.
Fig. 4 is a schematic structural diagram of a first embodiment of the wireless synchronization system of a road side unit according to the present invention, as shown in fig. 3, the system includes two RSUs, the two RSUs are divided into a group, and the RSUs in the same group have the same frequency point; which comprises the following steps: a first RSU401 and a second RSU402 with the same frequency point, where the first RSU401 is a master mode device and the second RSU402 is a slave mode device;
a first RSU401 for transmitting a first synchronization signal to a second RSU402 while generating a second synchronization signal;
a second RSU402, configured to generate a second synchronization signal upon receiving the first synchronization signal;
the first RSU401 and the second RSU402 are further configured to transmit DSRC data simultaneously in accordance with the second synchronization signal.
Optionally, before the first RSU401 sends the first synchronization signal to the second RSU402 and generates the second synchronization signal, the method further includes:
the first RSU401 is further configured to set a frequency point of the first RSU401 to be the same as a frequency point of the second RSU 402.
Optionally, the first RSU401 and the second RSU402 are RSUs of adjacent lanes.
In the wireless synchronization system for road side units provided in this embodiment, the same group of RSUs in the master mode transmit the first synchronization signal and generate the second synchronization signal, and the RSUs in the slave mode receive the first synchronization signal and generate the second synchronization signal, so that all road side devices in the system can acquire the second synchronization signal at the same time, and then all the road side devices can synchronously transmit DSRC data. Through wireless mode synchronous data, convenient and fast more need not carry out the threading, the cost is reduced.
Fig. 5 is a schematic structural diagram of a second embodiment of the road side unit wireless synchronization system provided in the present invention, where the system includes three road side devices RSUs, the three RSUs are divided into a group, and the frequency points of the RSUs in the same group are the same; which comprises the following steps: a first RSU501, a second RSU502, and a third RSU503 with the same frequency point, where the first RSU501 is a master mode device, the second RSU502 is a slave mode device, and the third RSU503 is a slave mode device;
the first RSU501 is configured to transmit a first synchronization signal to the second RSU502 and the third RSU503 and generate a second synchronization signal;
a second RSU502, configured to generate a second synchronization signal when receiving the first synchronization signal;
a third RSU503, configured to generate a second synchronization signal when receiving the first synchronization signal;
the first RSU501, the second RSU502, and the third RSU503 are further configured to transmit DSRC data simultaneously according to the second synchronization signal.
Optionally, before the first RSU501 sends the first synchronization signal to the second RSU502 and the third RSU503 and generates the second synchronization signal, the method further includes:
the first RSU501 is further configured to set a frequency point of the first RSU501 to be the same as frequency points of the second RSU502 and the third RSU 503.
Optionally, the first RSU501, the second RSU502, and the third RSU503 are RSUs of adjacent lanes, respectively. In the embodiment shown in fig. 4, when there are three RSUs in the same group, any one is set as the master mode RSU, and the other two are set as the slave mode RSUs. That is, when there are three RSUs, the master mode RSU may be an RSU located in the middle lane, or any one of RSUs located in both side lanes.
Alternatively, in other possible implementation manners based on the embodiment shown in fig. 5, when there are more than three RSUs in the same group, any one RSU is set as the master mode RSU, and the other RSUs are the slave mode RSUs. For example, when there are four RSUs in the system, the four RSUs may be divided into two groups, or the four RSUs may be divided into one group, and when the four RSUs are divided into one group, any one of the RSUs is set as the master mode RSU, and the other three RSUs are set as the slave mode RSUs; when the RSU is divided into two groups, each group is provided with two RSUs, the frequency points of the two groups are different, the frequency points of the two RSUs in each group are the same, and each group is provided with one master mode RSU and one slave mode RSU. And then, carrying out data synchronization according to the wireless synchronization method of the road side unit provided by the invention.
In the wireless synchronization system of the road side unit, the same group is provided with a plurality of slave mode RSUs, the master mode RSUs in the same group transmit first synchronization signals and generate second synchronization signals at the same time, and all the slave mode RSUs can simultaneously acquire the second synchronization signals by receiving the first synchronization signals and generating the second synchronization signals, so that all road side devices in the system can synchronously acquire the second synchronization signals, and further all the road side devices can synchronously transmit DSRC data. DSRC data are synchronized in a wireless mode, so that the method is more convenient and faster, threading is not needed, and the cost is reduced.
Furthermore, in the RSUs wireless synchronization system, the RSUs are divided into multiple groups, and it is not limited that each group must be grouped in a uniform distribution manner, and the number of RSUs included in each group is determined according to actual situations, and may include two RSUs or more RSUs, which is not limited by the present invention.
Fig. 6 is a schematic structural diagram of a roadside apparatus according to a first embodiment of the present invention. The road side equipment RSU is main mode equipment, including: a sending module 601 and a generating module 602, wherein:
a sending module 601, configured to send a first synchronization signal to a second RSU, where the RSU and the second RSU have the same frequency point, and the second RSU is a slave mode device;
a generating module 602, configured to generate a second synchronization signal when the sending module sends the first synchronization signal;
further, the sending module 601 is further configured to send DSRC data after acquiring the second synchronization signal.
The roadside apparatus provided in this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 2, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 7 is a schematic structural diagram of a second embodiment of the roadside apparatus provided by the present invention, as shown in fig. 7, on the basis of fig. 6, the roadside apparatus further includes: a setup module 603.
A setting module 603, configured to set a frequency point of the first RSU to be the same as a frequency point of the second RSU before the sending module 601 sends the first synchronization signal to the second RSU and generates the second synchronization signal at the same time.
Optionally, the first RSU and the second RSU are RSUs of adjacent lanes.
Fig. 8 is a schematic structural diagram of a third embodiment of the roadside apparatus provided by the present invention. The road side unit RSU is a slave mode unit, including: a receiving module 801, a generating module 802, and a transmitting module 803;
a receiving module 801, configured to receive a first synchronization signal sent by a first RSU, where the frequency points set by the first RSU and the second RSU are the same, and the first RSU is a master mode device;
a generating module 802, configured to generate a second synchronization signal when the receiving module 801 receives the first synchronization signal;
a transmitting module 803, configured to transmit DSRC data after acquiring the second synchronization signal.
The roadside apparatus provided in this embodiment may be used to implement the technical solution of the method embodiment shown in fig. 3, and the implementation principle and the technical effect are similar, which are not described herein again.
Fig. 9 is a schematic structural diagram of a fourth embodiment of the roadside apparatus provided by the present invention, as shown in fig. 9, on the basis of fig. 8, the roadside apparatus further includes: a setup module 804.
A setting module 804, configured to set a frequency point of the second RSU to be the same as a frequency point of the first RSU before the receiving module 801 receives the first synchronization signal sent by the first RSU.
Optionally, the second RSU and the first RSU are RSUs of adjacent lanes.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (5)
1. A road side unit wireless synchronization method is characterized by comprising the following steps:
a first road side device RSU sends a first synchronization signal to a second RSU and generates a second synchronization signal, wherein the frequency points set by the first RSU and the second RSU are the same, the first RSU is a master mode device, the second RSU is a slave mode device, the first RSU and the second RSU are RSU units in the same group, and the first RSU sends the first synchronization signal to the second RSU without receiving the first synchronization signal sent by other RSUs; the first RSU and the second RSU are RSUs of adjacent lanes;
after acquiring the second synchronization signal, the first RSU transmits dedicated short-range communication technology (DSRC) data;
before the first road side device RSU sends the first synchronization signal to the second RSU and generates the second synchronization signal, the method further includes:
and the frequency point set by the first RSU is the same as the frequency point set by the second RSU.
2. A road side unit wireless synchronization method is characterized by comprising the following steps:
the method comprises the following steps that a second RSU receives a first synchronization signal sent by a first RSU, wherein the frequency points of the first RSU and the second RSU are the same, the first RSU is a master mode device, and the second RSU is a slave mode device, wherein the first RSU and the second RSU are RSU units in the same group, and the second RSU only receives the first synchronization signal sent by the first RSU and does not send the first synchronization signal to other RSUs; the first RSU and the second RSU are RSUs of adjacent lanes;
the second RSU generates a second synchronization signal when receiving the first synchronization signal;
after acquiring the second synchronization signal, the second RSU transmits dedicated short-range communication technology (DSRC) data;
before the second RSU receives the first synchronization signal sent by the first RSU, the method further includes:
and the frequency point set by the second RSU is the same as the frequency point set by the first RSU.
3. A wireless synchronization system of road side units is characterized by comprising a plurality of RSUs of road side equipment, wherein the RSUs are divided into a plurality of groups, frequency points of the RSUs in each group are different, and the frequency points of the RSUs in the same group are the same; one group of the methods comprises: the first RSU and the second RSU have the same frequency point, and the first RSU is a master mode device and the second RSU is a slave mode device; the first RSU and the second RSU are RSUs of adjacent lanes;
the first RSU sends a first synchronization signal to a second RSU and generates a second synchronization signal, wherein the first RSU and the second RSU are RSU units in the same group, and the first RSU sends the first synchronization signal to the second RSU without receiving the first synchronization signal sent by other RSUs;
the second RSU generates a second synchronization signal when receiving the first synchronization signal;
the first RSU and the second RSU simultaneously transmit dedicated short range communication technology (DSRC) data according to the second synchronization signal;
before the first RSU sends the first synchronization signal to the second RSU and generates the second synchronization signal, the method further includes:
the first RSU is further configured to set a frequency point of the first RSU to be the same as a frequency point of the second RSU.
4. A roadside device characterized in that the roadside device RSU is a master mode device, the roadside device RSU is a first RSU, comprising:
the transmitting module is used for transmitting a first synchronization signal to a second RSU, wherein the frequency points set by the RSU and the second RSU are the same, the second RSU is slave mode equipment, the first RSU and the second RSU are RSU units in the same group, and the first RSU transmits the first synchronization signal to the second RSU without receiving the first synchronization signal transmitted by other RSUs; the first RSU and the second RSU are RSUs of adjacent lanes;
a generating module, configured to generate a second synchronization signal when the sending module sends the first synchronization signal;
the sending module is further configured to send dedicated short-range communication technology (DSRC) data after the second synchronization signal is acquired;
the roadside apparatus further includes:
and the setting module is used for setting the frequency point of the first RSU to be the same as the frequency point of the second RSU before the sending module sends the first synchronous signal to the second RSU and generates the second synchronous signal.
5. A roadside apparatus characterized in that the roadside apparatus RSU is a slave mode apparatus and the roadside apparatus RSU is a second RSU, comprising:
a receiving module, configured to receive a first synchronization signal sent by a first RSU, where the frequency points set for the first RSU and the second RSU are the same, the first RSU is a master mode device, the first RSU and the second RSU are RSU units in the same group, and the second RSU only receives the first synchronization signal sent by the first RSU and does not send the first synchronization signal to other RSUs; the first RSU and the second RSU are RSUs of adjacent lanes;
a generating module, configured to generate a second synchronization signal when the receiving module receives the first synchronization signal;
the sending module is used for sending dedicated short-range communication technology (DSRC) data after the second synchronization signal is acquired;
the roadside apparatus further includes:
and the setting module is used for setting the frequency point of the second RSU to be the same as the frequency point of the first RSU before the receiving module receives the first synchronization signal sent by the first RSU.
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