WO2017054293A1 - 一种交通预警方法、装置及系统 - Google Patents

一种交通预警方法、装置及系统 Download PDF

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Publication number
WO2017054293A1
WO2017054293A1 PCT/CN2015/093545 CN2015093545W WO2017054293A1 WO 2017054293 A1 WO2017054293 A1 WO 2017054293A1 CN 2015093545 W CN2015093545 W CN 2015093545W WO 2017054293 A1 WO2017054293 A1 WO 2017054293A1
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WIPO (PCT)
Prior art keywords
user terminal
roadside unit
received
warning information
driving condition
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Ceased
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PCT/CN2015/093545
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English (en)
French (fr)
Inventor
张晨璐
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Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
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Yulong Computer Telecommunication Scientific Shenzhen Co Ltd
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Ceased legal-status Critical Current

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/16—Anti-collision systems

Definitions

  • the invention belongs to the technical field of vehicle networks, and more particularly to a traffic warning method, device and system.
  • Vehicle network technology is the core technology of the future 5G (fifth generation mobile communication technology) network developed in recent years. 3GPP (3rd Generation Partnership Project) and 2015 have carried out a lot of research work on vehicle network technology, and The potential technical scenarios of vehicle network technology are given.
  • a traffic information broadcasting system based on a roadside unit is proposed in SA Technical Report TR22.885.
  • the user equipment User Equipment
  • the RSU Raad Side Unit
  • the RSU The first user terminal sends an early warning broadcast.
  • the early warning information broadcast does not need to be broadcast to all UEs.
  • the vehicle A and the vehicle B will be caused.
  • the existing system needs the ability to accurately identify the vehicle's position.
  • the present invention provides a traffic warning method, apparatus, and system for transmitting early warning information to certain first user terminals in a targeted manner, thereby reducing the probability of other first user terminals performing erroneous operations.
  • the technical solutions are as follows:
  • the present invention provides a traffic warning method, the method comprising:
  • the network side device determines, according to the driving condition of the first user terminal, whether the driving condition of the first user terminal satisfies a traffic warning condition, and if yes, the network side device sends the first roadside unit to the first roadside unit Send warning information;
  • the first roadside unit determines a second user terminal that receives the early warning information based on the driving condition of the first user terminal, and sends the early warning information to the second user terminal, where the early warning information is used to trigger The second user terminal performs an operation corresponding to the early warning information.
  • the network side device comprises a second roadside unit and a security server
  • the second roadside unit obtains the driving condition of the first user terminal, and determines whether the driving condition of the first user terminal satisfies the traffic warning condition based on the driving condition of the first user terminal, and if so, to the first
  • the roadside unit sends the warning information
  • the first user terminal or the second roadside unit obtains the driving condition of the first user terminal
  • the security server determines whether the driving condition of the first user terminal satisfies a traffic warning condition based on the driving condition of the first user terminal, and if yes, sends the early warning information to the first roadside unit.
  • the second roadside unit or the security server determines the first roadside unit based on the driving condition of the first user terminal.
  • the first user terminal or the network side device obtains the driving situation of the first user terminal, including:
  • the first user terminal or the network side device obtains a relative position of the first user terminal based on the currently obtained multiple received powers, and obtains, according to the currently obtained multiple received powers and the plurality of received powers obtained last time, The traveling direction of the first user terminal, wherein the received power is obtained by the first user terminal or the second roadside unit after receiving the probe message.
  • the first user terminal or the network side device obtains the driving condition of the first user terminal, and the first user terminal or the network side device obtains the driving parameter of the first user terminal, and is based on The driving parameter is used to obtain the driving state of the first user terminal.
  • the first user terminal obtains a relative position of the first user terminal based on the currently obtained multiple received powers, and obtains a location based on the currently obtained multiple received powers and the plurality of received powers obtained last time.
  • the driving direction of the first user terminal includes:
  • the first user terminal After receiving the respective probe messages, the first user terminal obtains the received power corresponding to each probe message;
  • the first user terminal compares the currently obtained multiple received powers to obtain a relative position of the first user terminal
  • the first user terminal compares each received power currently obtained with the received power obtained by receiving the probe message broadcast by the same second roadside unit last time, to obtain the traveling direction of the first user terminal.
  • the network side device obtains a relative position of the first user terminal based on the currently obtained multiple received powers, and obtains the foregoing according to the currently obtained multiple received powers and the plurality of received powers obtained last time.
  • the driving direction of the first user terminal including:
  • the second roadside unit receives the probe message periodically sent by the first user terminal
  • the second roadside unit After receiving the probe message, the second roadside unit obtains the received power corresponding to the probe message;
  • the second roadside unit transmits the obtained received power to the other second roadside unit, and receives the received power obtained by the other second roadside unit after receiving the probe message;
  • the second roadside unit compares the currently obtained multiple received powers to obtain a relative position of the first user terminal, where the currently obtained multiple received powers include that the second roadside unit receives the probe message.
  • the received power obtained afterwards and the received power obtained by the other second roadside unit after receiving the probe message;
  • the second roadside unit compares each of the currently received received powers with the received power obtained by receiving the probe message broadcast by the same first user terminal, respectively, to obtain the traveling direction of the first user terminal.
  • the present invention provides a traffic warning system, where the system includes: a first user terminal, a network side device, a first roadside unit, and a second user terminal;
  • the first user terminal or the network side device is configured to obtain a driving situation of the first user terminal
  • the network side device is configured to determine, according to the driving condition of the first user terminal, whether the driving condition of the first user terminal satisfies a traffic warning condition, and if yes, send the early warning information to the first roadside unit;
  • the first roadside unit is configured to determine, according to the driving condition of the first user terminal, a second user terminal that receives the early warning information, and send the early warning information to the second user terminal, where the early warning information And configured to trigger the second user terminal to perform an operation corresponding to the early warning information.
  • the network side device comprises a second roadside unit and a security server
  • the second roadside unit is configured to obtain a driving condition of the first user terminal, and determine, according to the driving condition of the first user terminal, whether the driving condition of the first user terminal satisfies a traffic warning condition, and if so, Sending early warning information to the first roadside unit; wherein the sending the early warning information to the first roadside unit includes the second roadside unit directly transmitting the early warning information to the first roadside unit, or the second roadside unit passes The security server sends alert information to the first roadside unit.
  • the network side device comprises a second roadside unit and a security server
  • the second roadside unit is configured to obtain a driving condition of the first user terminal
  • the security server is configured to determine, according to a form of the first user terminal, whether the driving condition of the first user terminal satisfies a traffic warning condition, and if yes, send the early warning information to the first roadside unit.
  • the first roadside unit is determined by a second roadside unit or a security server in the traffic warning system.
  • the present invention provides a traffic warning method, the method comprising:
  • the sending the warning information, where the warning information is used to trigger the second user terminal to perform an operation corresponding to the warning information, where the second user terminal is based on The driving condition of the first user terminal is obtained.
  • the obtaining the driving situation of the first user terminal comprises: obtaining a relative position of the first user terminal based on the currently obtained multiple received powers, and based on the currently obtained multiple received powers and the last obtained The plurality of received powers obtain the traveling direction of the first user terminal.
  • the obtaining the driving situation of the first user terminal comprises: obtaining a driving parameter of the first user terminal, and obtaining a driving state of the first user terminal based on the driving parameter.
  • the relative position of the first user terminal is obtained based on the currently obtained multiple received powers, and the first user is obtained based on the currently obtained multiple received powers and the plurality of received powers obtained last time.
  • the direction of travel of the terminal including:
  • Each of the currently received received powers is compared with the received power obtained by receiving the probe message broadcast by the same first user terminal, respectively, to obtain the traveling direction of the first user terminal.
  • the relative position of the first user terminal is obtained based on the currently obtained multiple received powers, and the first user is obtained based on the currently obtained multiple received powers and the plurality of received powers obtained last time.
  • the direction of travel of the terminal including:
  • Each of the currently received received powers is compared with the received power obtained by receiving the probe message broadcast by the same second roadside unit last time, to obtain the traveling direction of the first user terminal.
  • the present invention provides a traffic warning device, the device comprising:
  • a obtaining unit configured to obtain a driving condition of the first user terminal
  • a determining unit configured to determine, according to the driving condition of the first user terminal, whether the driving condition of the first user terminal meets a traffic warning condition
  • a sending unit configured to send, when the driving condition of the first user terminal meets the traffic warning condition, the warning information, where the warning information is used to trigger the second user terminal to perform an operation corresponding to the warning information,
  • the second user terminal is derived based on the driving condition of the first user terminal.
  • the obtaining unit is configured to obtain a relative position of the first user terminal based on the currently obtained multiple received powers, and obtain, according to the currently obtained multiple received powers and the plurality of received powers obtained last time, The direction of travel of the first user terminal.
  • the obtaining unit is configured to obtain a driving parameter of the first user terminal, and obtain a driving state of the first user terminal based on the driving parameter.
  • the obtaining unit comprises:
  • a first acquiring subunit configured to acquire a probe message periodically sent by the first user terminal
  • a first calculating subunit configured to obtain a received power corresponding to the probe message after receiving the probe message
  • a radio frequency subunit configured to send the received power to the other second roadside unit, and receive the received power obtained by the other second roadside unit after receiving the probe message;
  • a second calculating subunit configured to compare the currently obtained multiple received powers to obtain a relative position of the first user terminal, where the currently obtained multiple received powers include the second roadside unit receiving the detected The received power obtained after the message and the received power sent by the other second roadside unit;
  • a third calculating sub-unit configured to compare each of the currently received received powers with a received power obtained by receiving the probe message broadcast by the same first user terminal, to obtain a traveling direction of the first user terminal.
  • the obtaining unit comprises:
  • a second obtaining subunit configured to obtain a received power uploaded by the first user terminal, where the receiving power The rate is obtained by the first user terminal after receiving the probe message periodically broadcasted by the second roadside unit;
  • a fourth calculating subunit configured to compare the currently obtained multiple received powers to obtain a relative position of the first user terminal
  • a fifth calculating sub-unit configured to compare each received power currently obtained with a received power obtained by receiving a probe message broadcast by the same second roadside unit last time, to obtain a traveling direction of the first user terminal .
  • the second user terminal may be obtained based on at least the driving condition of the first user terminal, so that if the warning information needs to be sent, the warning information may be sent only to the second user terminal, so that the other The first user terminal no longer receives the early warning information, so that the other first user terminal that does not receive the early warning information may perform a corresponding operation, reducing the probability that other first user terminals perform an erroneous operation, that is, the foregoing provided by the present invention.
  • the technical solution can specifically transmit the warning information to the second user terminal only to reduce the probability that other first user terminals (the first user terminal not being alerted) perform an erroneous operation.
  • FIG. 1 is a schematic diagram of a conventional traffic information broadcasting system based on a roadside unit
  • FIG. 2 is a flow chart of a traffic warning method according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of a traffic scenario according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of obtaining a driving situation of a first user terminal in a traffic warning method according to an embodiment of the present invention
  • FIG. 5 is another flowchart of obtaining a driving situation of a first user terminal in a traffic warning method according to an embodiment of the present invention
  • FIG. 6 is a schematic structural diagram of a traffic warning system according to an embodiment of the present invention.
  • FIG. 7 is a flowchart of another traffic warning method according to an embodiment of the present invention.
  • FIG. 8 is a flow chart showing the relative position and traveling direction of the first user terminal obtained in the traffic warning method shown in FIG. 7;
  • FIG. 9 is another flow chart of obtaining the relative position and the traveling direction of the first user terminal in the traffic warning method shown in FIG. 7;
  • FIG. 10 is a schematic structural diagram of a traffic warning device according to an embodiment of the present invention.
  • FIG. 2 a signaling interaction diagram of a traffic warning method according to an embodiment of the present invention is shown, which may include the following steps:
  • the first user terminal UE or the network side device obtains a driving situation of the first user terminal.
  • the network side device may be an RSU, and the driving condition of the first user terminal is used to indicate that the object where the first user terminal is located is traveling on the road, for example, indicating the driving direction and driving state of the vehicle where the first user terminal is located on the road (at Acceleration state or deceleration state).
  • the first user terminal or the network side device may obtain the relative position of the first user terminal based on the currently obtained multiple received powers, and based on the plurality of currently received received powers and the multiple times obtained last time.
  • Receiving power obtaining a traveling direction of the first user terminal, wherein the received power is obtained by the first user terminal or the network side device after receiving the probe message.
  • the relative position and the traveling direction of the first user terminal may be obtained by the first user terminal itself or may be obtained by the network side device. That is, the first user terminal can be divided into a terminal active type and a terminal passive type.
  • the first user terminal can obtain the relative position and the traveling direction of the first user terminal autonomously, or for the terminal.
  • the first user terminal of the active type the first user terminal can autonomously obtain the received power corresponding to the probe message sent by the network side device, and then send the received power obtained by the first user terminal to the network side device, where the network side device To obtain the relative position and direction of travel of the first user terminal.
  • the first user terminal of the terminal passive type the first user terminal may periodically send a probe message to the network side device, and the network side device obtains the relative position and the traveling direction of the first user terminal.
  • the driving situation may also include other information, such as a driving state, which is used to at least indicate whether the first user terminal is in an accelerated state or a decelerating state, and in the embodiment of the invention, the driving state may be based on The driving parameters of the first user terminal are obtained.
  • the driving parameters include at least: a running speed and an acceleration, which can be obtained by a speed sensor installed in the first user terminal, and the acceleration can be obtained by an acceleration sensor installed in the first user terminal. Based on the driving speed and acceleration, especially the acceleration, it can be determined whether the current object of the first user terminal is in an acceleration state or a deceleration state.
  • the braking instruction information of the vehicle where the first user terminal is located may be further obtained, which is not described in the embodiment of the present invention.
  • the network side device determines, according to the driving condition of the first user terminal, whether the driving condition of the first user terminal satisfies the traffic warning condition, and if yes, the network side device sends the early warning information to the first roadside unit.
  • the driving situation of the first user terminal is used to indicate that the object of the first user terminal is traveling on the road, it may be determined whether the traffic warning condition is met, that is, the object of the first user terminal is determined based on the driving condition of the first user terminal. Whether you are in illegal driving.
  • the first direction can be judged based on the traveling direction and the relative position.
  • the driving condition of the user terminal satisfies the traffic warning condition.
  • the driving situation obtained by the first user terminal worn by the pedestrian indicates that the pedestrian is crossing the road, and the traffic information indicates that the pedestrian is illegally wearing a red light, so that the vehicle passing through the intersection where the pedestrian is located may collide with the vehicle.
  • the driving condition of the first user terminal satisfies the traffic warning condition.
  • the embodiment of the present invention combines the driving state in the traveling direction and the relative position to evaluate how long the object of the first user terminal passes through the intersection, whether it is in an acceleration state or a deceleration state, so that the network side device can be based thereon. Determine whether the traffic warning condition is met to send the warning information.
  • the network side device may further combine the traffic information to determine whether the traffic warning condition is met. For example, after obtaining the driving condition of the first user terminal, the traffic light of the current intersection is a red light green light to determine whether the traffic warning condition is met, if the first
  • the relative position of the object where the user terminal is located indicates that the vehicle or pedestrian is within the intersection and is in the acceleration state to move toward the intersection. At present, the traffic light at the intersection is a red light, indicating that the vehicle or the pedestrian is to traverse the red light, so that the judgment can be satisfied at this time. Traffic warning conditions, sending warning information to instruct other vehicles to pay attention to violations.
  • the network side device includes at least a second roadside unit and a security server, and the working process of the second roadside unit and the security server may be in the following manners. Ways to execute:
  • the second roadside unit obtains the driving condition of the first user terminal, and determines whether the driving condition of the first user terminal satisfies the traffic warning condition, and if the second roadside unit determines the driving condition based on the first user terminal.
  • a roadside unit that sends warning information to the first roadside unit;
  • the second roadside unit obtains the driving condition of the first user terminal, and determines whether the driving condition of the first user terminal satisfies the traffic warning condition, and if yes, sends the driving condition of the first user terminal to Security server.
  • the security server determines the first roadside unit based on the driving condition of the first user terminal, and sends the warning information to the first roadside unit;
  • the second roadside unit obtains the driving condition of the first user terminal, determines whether the driving condition of the first user terminal satisfies the traffic warning condition, and if the second roadside unit determines based on the driving condition of the first user terminal a first roadside unit, and triggering the security server to send the warning information to the first roadside unit;
  • the second roadside unit will obtain the information required for the driving situation of the first user terminal, such as receiving power, etc., and send it to the security server, and the security server obtains the driving condition of the first user terminal, and determines the driving of the first user terminal. Whether the situation meets the traffic warning conditions, if it is a security service
  • the first roadside unit is determined based on the driving condition of the first user terminal, and the warning information is transmitted to the first roadside unit.
  • the first roadside unit described above is a second roadside unit for transmitting early warning information to other first user terminals that may have an accident with a vehicle or pedestrian that is in violation.
  • the manner of obtaining the first roadside unit may be: the second roadside unit or the security server obtains the location of the second user terminal according to the relative position of the early warning user terminal, and then based on each second roadside unit.
  • the location information is used to obtain the second roadside unit to which the second user terminal belongs, such that the second roadside unit to which the second user terminal belongs is the first roadside unit.
  • the early warning user terminal is the first user terminal that satisfies the traffic warning condition
  • the second roadside unit to which the second user terminal belongs is the second roadside unit whose signal range covers the second user terminal.
  • the second roadside unit to which the second user terminal belongs includes more than one
  • the second roadside unit may be selected as the first roadside unit; of course, it is also possible to determine the second roadside unit and the need to send the warning information.
  • the first roadside unit that sends the early warning information to the second user terminal is the same second roadside unit. In this case, if the first roadside unit is obtained by the security server, the security server returns the warning information. To the second roadside unit, if the first roadside unit is obtained by the second roadside unit, the second roadside unit may directly send the warning information to the second user terminal.
  • the first roadside unit determines, according to the driving condition of the first user terminal, the second user terminal that receives the early warning information, and sends the early warning information to the second user terminal, where the early warning information is used to trigger the second user terminal to perform the corresponding to the early warning information. operating.
  • the first roadside unit may obtain an approximate range of the first user terminal based on the relative position and the traveling direction, such as which intersection is located, and the first roadside unit may further determine the first based on the traveling speed and the acceleration.
  • the time and speed of the vehicle or pedestrian where the user terminal is located through the intersection, so that the first user terminal having a driving conflict with the first user terminal is the second user terminal. If the second roadside unit in FIG. 1 detects that the pedestrian has an illegal crossing behavior, the first user terminal in the vehicle D and the vehicle E is the second user terminal. At this time, the first roadside unit sends the warning information to the second user terminal, and the second user terminal sends an early warning alarm to stop the driver from giving off.
  • the warning alarm can be an audible alarm, a vibration alarm or any other prompting method.
  • the traffic warning method provided by the present invention can obtain the second user terminal based on at least the driving condition of the first user terminal, so that the warning information can be sent only to the second user if the warning information needs to be sent.
  • the terminal causes the other first user terminals to no longer receive the early warning information, so that the other first user terminals that have not received the early warning information can perform the corresponding operations, thereby reducing the probability that other first user terminals perform the wrong operation, that is, the present
  • the above technical solution provided by the invention can specifically transmit the warning information only to the second user terminal, so as to reduce the probability that other first user terminals (the first user terminal not being alerted) perform an erroneous operation.
  • the driving situation of the first user terminal or the network side device based on the received power is used to describe the driving situation of the first user terminal.
  • the network side device is shown in FIG. 3 as four second roadside units, denoted as RSU1, RSU2, RSU3, and RSU4, respectively.
  • RSU1, RSU2, RSU3, and RSU4 second roadside units
  • the flowchart thereof is as shown in FIG. 4, and may include the following steps:
  • the first user terminal receives a probe message that is sent by a plurality of second roadside units periodically.
  • the first user terminal After receiving the respective probe messages, the first user terminal obtains the received power corresponding to each probe message.
  • the received power can be predicted according to the signal strength. There are various ways to predict the received power according to the signal strength in the prior art, which is not described in the embodiment of the present invention.
  • the first user terminal compares the currently received multiple received powers to obtain a relative location of the first user terminal.
  • the method of obtaining position information is to compare the signal difference between a plurality of signals. That is, the first user terminal obtains the relative position of the first user terminal according to the obtained difference of the multiple received powers. As shown in FIG. 3, the first user terminal obtains the received powers of the probe messages sent by the RSU1, the RSU2, the RSU3, and the RSU4, respectively. Yes: A1, A2, A3 and A4.
  • A1>A2 indicates that the first user terminal is close to the RSU1 side. If A1>A3 and A1>A4 in the case of A1>A2, and both A2 and A1 are much larger than A3 and A4, the first user is explained.
  • the terminal is close to the RSU1 and away from the RSU3 and RSU4 sides, so the relative position of the first user terminal can be obtained after comparing the plurality of received powers. It is of course also possible to locate the relative position of the first user terminal based on the transmit power and the received power.
  • the first user terminal separately obtains each received power separately from the previous reception.
  • the received power obtained after the probe message broadcasted by the second roadside unit is compared to obtain the traveling direction of the first user terminal. That is to say, the first user terminal determines the direction of the received power in the multiple measurement process according to the detection message sent by the multiple RSUs, and determines the location where the UE approaches or moves away from each RSU, thereby determining the traveling direction. It should also be noted that when comparing the trend of the received power obtained by the probe messages sent by multiple RSUs in multiple measurements, the probe messages sent by the same second roadside unit are compared.
  • the received powers obtained at time T0 are A1', A2', A3', and A4', respectively, compared with the received powers A1, A2, A3, and A4 obtained at time T1, when A1' ⁇ A1.
  • A2' ⁇ A2, A3' ⁇ A3 and A4' ⁇ A4 it can be judged that the first user terminal is moving in the direction toward the RSU1 and gradually approaching the RSU3 and the RSU4.
  • A1'>A1, A2'>A2 but A3' ⁇ A3, A4' ⁇ A4 it can be explained that the first user terminal is facing RSU3 and RSU4, but has traveled farther away from the positions of RSU1 and RSU2. In this way, the approximate driving direction of the first user terminal can be determined, and the first user terminal can be instructed to arrive at the intersection or have left the intersection.
  • the second roadside unit obtains the running condition of the first user terminal, which may include the following steps:
  • the second roadside unit receives the probe message periodically sent by the first user equipment.
  • the second roadside unit After receiving the probe message, the second roadside unit obtains the received power corresponding to the probe message.
  • the second roadside unit sends the received power to the other second roadside unit, and receives the received power obtained by the other second roadside unit after receiving the probe message, so that the second roadside unit can obtain the same first
  • the received power of the user terminal in different second roadside units enables the second roadside unit to compare the plurality of received powers of the same first user terminal to obtain the relative position and the traveling direction of the first user terminal.
  • the second roadside unit compares the currently received multiple received powers to obtain a relative position of the first user terminal, where the currently obtained multiple received powers include the received by the second roadside unit after receiving the probe message.
  • the received power obtained by the power and other second roadside units after receiving the probe message.
  • the second roadside unit separately obtains each received power separately from the previous reception.
  • the received power obtained after the probe message broadcasted by the first user terminal is compared to obtain the traveling direction of the first user terminal.
  • the manner in which the second roadside unit obtains the relative position and the traveling direction in the running condition is the same as the corresponding step in the above-mentioned flowchart shown in FIG. 4, which is not described in the embodiment of the present invention.
  • the embodiment of the present invention can also use the time difference to obtain the relative position and the traveling direction, wherein the time difference is the difference between the sending time and the receiving time of the same probe message, and the principle of receiving power can also be adopted by the same.
  • the relative position and the direction of travel are obtained, which are not described in detail in the embodiments of the present invention.
  • the embodiment of the present invention further provides a traffic warning system, as shown in FIG. 6 , which may include: a first user terminal 11 , a network side device 12 , and a first roadside unit 13 . And a second user terminal 14.
  • a traffic warning system as shown in FIG. 6 , which may include: a first user terminal 11 , a network side device 12 , and a first roadside unit 13 . And a second user terminal 14.
  • the first user terminal 11 or the network side device 12 is configured to obtain the driving condition of the first user terminal.
  • the driving situation of the first user terminal is used to indicate that the object where the first user terminal is located is driving on the road, for example, indicating the traveling direction and driving state (in an acceleration state or a deceleration state) of the vehicle where the first user terminal is located on the road.
  • the first user terminal or the network side device may obtain the relative position of the first user terminal based on the currently obtained multiple received powers, and based on the plurality of currently received received powers and the multiple times obtained last time.
  • the receiving power is obtained, and the driving direction of the first user terminal is obtained.
  • the receiving power is obtained by the first user terminal or the network side device after receiving the detection message.
  • the driving situation may also include other information, such as a driving state, which is used to at least indicate whether the first user terminal is in an accelerated state or a decelerating state, and in the embodiment of the invention, the driving state may be based on The driving parameters of the first user terminal are obtained.
  • the driving parameters include at least: a running speed and an acceleration, which can be obtained by a speed sensor installed in the first user terminal, and the acceleration can be obtained by an acceleration sensor installed in the first user terminal. Based on the driving speed and acceleration, especially the acceleration can determine the current Whether the object where the user terminal is located is in an accelerated state or a decelerated state.
  • the braking instruction information of the vehicle where the first user terminal is located may be further obtained, which is not described in the embodiment of the present invention.
  • the network side device 12 is configured to determine, according to the driving condition of the first user terminal, whether the driving condition of the first user terminal satisfies the traffic warning condition, and if yes, send the early warning information to the first roadside unit. Since the driving situation of the first user terminal is used to indicate that the object of the first user terminal is traveling on the road, it may be determined whether the traffic warning condition is met, that is, the object of the first user terminal is determined based on the driving condition of the first user terminal. Whether you are in illegal driving.
  • the first direction can be judged based on the traveling direction and the relative position.
  • the driving condition of the user terminal satisfies the traffic warning condition.
  • the driving situation obtained by the first user terminal worn by the pedestrian indicates that the pedestrian is crossing the road, and the traffic information indicates that the pedestrian is illegally wearing a red light, so that the vehicle passing through the intersection where the pedestrian is located may collide with the vehicle.
  • the driving condition of the first user terminal satisfies the traffic warning condition.
  • the embodiment of the present invention combines the driving state in the traveling direction and the relative position to evaluate how long the object of the first user terminal passes through the intersection, whether it is in an acceleration state or a deceleration state, so that the network side device can be based thereon. Determine whether the traffic warning condition is met to send the warning information.
  • the network side device may further combine the traffic information to determine whether the traffic warning condition is met. For example, after obtaining the driving condition of the first user terminal, the traffic light of the current intersection is a red light green light to determine whether the traffic warning condition is met, if the first
  • the relative position of the object where the user terminal is located indicates that the vehicle or pedestrian is within the intersection and is in the acceleration state to move toward the intersection. At present, the traffic light at the intersection is a red light, indicating that the vehicle or the pedestrian is to traverse the red light, so that the judgment can be satisfied at this time. Traffic warning conditions, sending warning information to instruct other vehicles to pay attention to violations.
  • the network side device includes at least a second roadside unit and a security server, and the working process of the second roadside unit and the security server may be in the following manners. In the process, it can be executed in any way:
  • the second roadside unit obtains the driving condition of the first user terminal, and determines whether the driving condition of the first user terminal satisfies the traffic warning condition, and if the second roadside unit determines the driving condition based on the first user terminal.
  • a roadside unit that sends warning information to the first roadside unit;
  • the second roadside unit obtains the driving condition of the first user terminal, and determines whether the driving condition of the first user terminal satisfies the traffic warning condition, and if yes, sends the driving condition of the first user terminal to Security server.
  • the security server determines the first roadside unit based on the driving condition of the first user terminal, and sends the warning information to the first roadside unit;
  • the second roadside unit obtains the driving condition of the first user terminal, determines whether the driving condition of the first user terminal satisfies the traffic warning condition, and if the second roadside unit determines based on the driving condition of the first user terminal a first roadside unit, and triggering the security server to send the warning information to the first roadside unit;
  • the second roadside unit will obtain the information required for the driving situation of the first user terminal, such as receiving power, etc., and send it to the security server, and the security server obtains the driving condition of the first user terminal, and determines the driving of the first user terminal. Whether the situation satisfies the traffic warning condition, if the security server determines the first roadside unit based on the driving condition of the first user terminal, and sends the warning information to the first roadside unit.
  • the first roadside unit described above is a second roadside unit for transmitting early warning information to other first user terminals that may have an accident with a vehicle or pedestrian that is in violation.
  • the manner of obtaining the first roadside unit may be: the second roadside unit or the security server obtains the location of the second user terminal according to the relative position of the early warning user terminal, and then based on each second roadside unit.
  • the location information is used to obtain the second roadside unit to which the second user terminal belongs, such that the second roadside unit to which the second user terminal belongs is the first roadside unit.
  • the early warning user terminal is the first user terminal that satisfies the traffic warning condition
  • the second roadside unit to which the second user terminal belongs is the second roadside unit whose signal range covers the second user terminal.
  • the second roadside unit to which the second user terminal belongs includes more than one
  • the second roadside unit may be selected as the first roadside unit; of course, it is also possible to determine the second information that needs to send the warning information.
  • the roadside unit and the first roadside unit that needs to send the warning information to the second user terminal are the same second roadside unit. In this case, if the first roadside unit is obtained by the security server, the security server will The warning information is transmitted back to the second roadside unit. If the first roadside unit is obtained by the second roadside unit, the second roadside unit can directly send the early warning information to the second user terminal.
  • the first roadside unit 13 is configured to determine, according to the driving condition of the first user terminal, the second user terminal that receives the early warning information, and send the early warning information to the second user terminal, where the early warning information is used to trigger the second user terminal to execute the early warning information. Corresponding operation.
  • the first roadside unit may obtain an approximate range of the first user terminal based on the relative position and the traveling direction, such as which intersection is located, and the first roadside unit may further determine the first based on the traveling speed and the acceleration.
  • the time and speed of the vehicle or pedestrian where the user terminal is located through the intersection, so that the first user terminal having a driving conflict with the first user terminal is the second user terminal. If the second roadside unit in FIG. 1 detects that the pedestrian has an illegal crossing behavior, the first user terminal in the vehicle D and the vehicle E is the second user terminal. At this time, the first roadside unit sends the warning information to the second user terminal, and the second user terminal sends an early warning alarm to stop the driver from giving off.
  • the warning alarm can be an audible alarm, a vibration alarm or any other prompting method.
  • the traffic warning system provided by the present invention can obtain the second user terminal based on at least the driving condition of the first user terminal, so that the warning information can be sent only to the second user if the warning information needs to be sent.
  • the terminal causes the other first user terminals to no longer receive the early warning information, so that the other first user terminals that have not received the early warning information can perform the corresponding operations, thereby reducing the probability that other first user terminals perform the wrong operation, that is, the present
  • the above technical solution provided by the invention can specifically transmit the warning information only to the second user terminal, so as to reduce the probability that other first user terminals (the first user terminal not being alerted) perform an erroneous operation.
  • FIG. 7 is a flowchart of another traffic warning method according to an embodiment of the present invention, which may include the following steps:
  • the driving situation of the first user terminal is used to indicate that the object where the first user terminal is located is traveling on the road, for example, indicating the first user terminal.
  • the direction of travel and the state of travel of the vehicle on the road (in an accelerated state or a decelerated state).
  • the first user terminal or the network side device may obtain the relative position of the first user terminal based on the currently obtained multiple received powers, and based on the plurality of currently received received powers and the multiple times obtained last time.
  • Receiving power obtaining a traveling direction of the first user terminal, wherein the received power is obtained by the first user terminal or the network side device after receiving the probe message.
  • the relative position and the traveling direction of the first user terminal may be obtained by the first user terminal itself or may be obtained by the network side device. That is, the first user terminal can be divided into a terminal active type and a terminal passive type.
  • the first user terminal can independently obtain the relative position and the traveling direction of the first user terminal, and the relative position.
  • the driving direction is sent to the network side device, or for the first user terminal of the terminal active type, the first user terminal can obtain the receiving power corresponding to the detection message sent by the network side device, and then obtain the first user terminal.
  • the received power is sent to the network side device, and the network side device obtains the relative position and the traveling direction of the first user terminal.
  • the first user terminal of the terminal passive type the first user terminal may periodically send a probe message to the network side device, and the network side device obtains the relative position and the traveling direction of the first user terminal.
  • the driving situation may also include other information, such as a driving state, which is used to at least indicate whether the first user terminal is in an accelerated state or a decelerating state, and in the embodiment of the invention, the driving state may be based on The driving parameters of the first user terminal are obtained.
  • the driving parameters include at least: a running speed and an acceleration, which can be obtained by a speed sensor installed in the first user terminal, and the acceleration can be obtained by an acceleration sensor installed in the first user terminal. Based on the driving speed and acceleration, especially the acceleration, it can be determined whether the current object of the first user terminal is in an acceleration state or a deceleration state.
  • the braking instruction information of the vehicle where the first user terminal is located may be further obtained, which is not described in the embodiment of the present invention.
  • the warning information is used to trigger the second user terminal to perform an operation corresponding to the warning information, and the first user terminal of the early warning information is obtained based on the driving condition of the first user terminal.
  • the driving situation of the first user terminal is used to indicate that the object of the first user terminal is traveling on the road, it may be determined whether the traffic warning condition is met, that is, the object of the first user terminal is determined based on the driving condition of the first user terminal. Whether you are in illegal driving.
  • the first direction can be judged based on the traveling direction and the relative position.
  • the driving condition of the user terminal satisfies the traffic warning condition.
  • the driving situation obtained by the first user terminal worn by the pedestrian indicates that the pedestrian is crossing the road, and the traffic information indicates that the pedestrian is illegally wearing a red light, so that the vehicle passing through the intersection where the pedestrian is located may collide with the vehicle.
  • the driving condition of the first user terminal satisfies the traffic warning condition.
  • the network side device includes at least a second roadside unit and a security server, and the working process of the second roadside unit and the security server may be in the following manners. Ways to execute:
  • the second roadside unit obtains the driving condition of the first user terminal, and determines whether the driving condition of the first user terminal satisfies the traffic warning condition, and if the second roadside unit is based on the first use
  • the driving condition of the terminal determines the first roadside unit, and sends the warning information to the first roadside unit;
  • the second roadside unit obtains the driving condition of the first user terminal, and determines whether the driving condition of the first user terminal satisfies the traffic warning condition, and if yes, sends the driving condition of the first user terminal to Security server.
  • the security server determines the first roadside unit based on the driving condition of the first user terminal, and sends the warning information to the first roadside unit;
  • the second roadside unit obtains the driving condition of the first user terminal, determines whether the driving condition of the first user terminal satisfies the traffic warning condition, and if the second roadside unit determines based on the driving condition of the first user terminal a first roadside unit, and triggering the security server to send the warning information to the first roadside unit;
  • the second roadside unit will obtain the information required for the driving situation of the first user terminal, such as receiving power, etc., and send it to the security server, and the security server obtains the driving condition of the first user terminal, and determines the driving of the first user terminal. Whether the situation satisfies the traffic warning condition, if the security server determines the first roadside unit based on the driving condition of the first user terminal, and sends the warning information to the first roadside unit.
  • the first roadside unit described above is a second roadside unit for transmitting early warning information to other first user terminals that may have an accident with a vehicle or pedestrian that is in violation.
  • the manner of obtaining the first roadside unit may be: the second roadside unit or the security server obtains the location of the second user terminal according to the relative position of the early warning user terminal, and then based on each second roadside unit.
  • the location information is used to obtain the second roadside unit to which the second user terminal belongs, such that the second roadside unit to which the second user terminal belongs is the first roadside unit.
  • the early warning user terminal is the first user terminal that satisfies the traffic warning condition
  • the second roadside unit to which the second user terminal belongs is the second roadside unit whose signal range covers the second user terminal.
  • the second roadside unit to which the second user terminal belongs includes more than one
  • the second roadside unit may be selected as the first roadside unit; of course, it is also possible to determine the second roadside unit and the need to send the warning information.
  • the first roadside unit that sends the early warning information to the second user terminal is the same second roadside unit. In this case, if the first roadside unit is obtained by the security server, the security server returns the warning information. Give the second roadside unit, if it is the first by the second roadside unit The roadside unit can send the early warning information directly to the second user terminal by the second roadside unit.
  • the first roadside unit may obtain an approximate range of the first user terminal based on the relative position and the traveling direction, such as which intersection is located, and the first roadside unit may further determine the first based on the traveling speed and the acceleration.
  • the time and speed of the vehicle or pedestrian where the user terminal is located through the intersection, so that the first user terminal having a driving conflict with the first user terminal is the second user terminal. If the second roadside unit in FIG. 1 detects that the pedestrian has an illegal crossing behavior, the first user terminal in the vehicle D and the vehicle E is the second user terminal. At this time, the first roadside unit sends the warning information to the second user terminal, and the second user terminal sends an early warning alarm to stop the driver from giving off.
  • the warning alarm can be an audible alarm, a vibration alarm or any other prompting method.
  • the traffic warning method provided by the present invention can obtain the second user terminal based on at least the driving condition of the first user terminal, so that the warning information can be sent only to the second user if the warning information needs to be sent.
  • the terminal causes the other first user terminals to no longer receive the early warning information, so that the other first user terminals that have not received the early warning information can perform the corresponding operations, thereby reducing the probability that other first user terminals perform the wrong operation, that is, the present
  • the above technical solution provided by the invention can specifically transmit the warning information only to the second user terminal, so as to reduce the probability that other first user terminals (the first user terminal not being alerted) perform an erroneous operation.
  • the manner of obtaining the relative position and the traveling direction may include, but is not limited to, the flowchart shown in FIG. 8 and FIG. 9 described below.
  • FIG. 8 shows a manner of obtaining the relative position and the traveling direction in the embodiment of the present invention, which may include the following steps:
  • the received power can be predicted according to the signal strength. There are various ways to predict the received power according to the signal strength in the prior art, which is not described in the embodiment of the present invention.
  • the received power in the two-way unit enables the second roadside unit to compare the multiple received powers of the same first user terminal to obtain the relative position of the first user terminal and Direction of travel.
  • the 804 Compare the currently obtained multiple received powers to obtain a relative position of the first user terminal, where the currently obtained multiple received powers include the received power obtained by the second roadside unit after receiving the probe message, and other second The received power obtained by the roadside unit after receiving the probe message.
  • the manner in which the second roadside unit obtains the relative position and the traveling direction is the same as the corresponding step in the flowchart shown in FIG. 4, which is not described in the embodiment of the present invention.
  • FIG. 9 illustrates another manner of obtaining the above relative position and driving direction in the embodiment of the present invention, which may include the following steps:
  • the manner in which the second roadside unit obtains the relative position and the traveling direction is the same as the corresponding step in the flowchart shown in FIG. 4, which is not described in the embodiment of the present invention.
  • the embodiment of the present invention further provides a traffic warning device.
  • the schematic diagram of the structure is as shown in FIG. 10 , and may include: an obtaining unit 20 , a determining unit 21 , and a sending unit 22 .
  • the obtaining unit 20 is configured to obtain a driving situation of the first user terminal.
  • the driving situation of the first user terminal is used to indicate that the object where the first user terminal is located is driving on the road, for example, indicating the traveling direction and driving state (in an acceleration state or a deceleration state) of the vehicle where the first user terminal is located on the road.
  • the obtaining unit may obtain the relative position of the first user terminal based on the currently obtained multiple received powers, and obtain the first based on the plurality of currently received received powers and the plurality of received powers obtained last time.
  • the traveling direction of the user terminal, wherein the received power is obtained by the first user terminal or the network side device after receiving the probe message.
  • the driving situation may also include other information, such as a driving state, which is used to at least indicate whether the first user terminal is in an accelerated state or a decelerating state, and in the embodiment of the invention, the driving state may be based on The driving parameters of the first user terminal are obtained.
  • the driving parameters include at least: a running speed and an acceleration, which can be obtained by a speed sensor installed in the first user terminal, and the acceleration can be obtained by an acceleration sensor installed in the first user terminal. Based on the driving speed and acceleration, especially the acceleration, it can be determined whether the current object of the first user terminal is in an acceleration state or a deceleration state.
  • the braking instruction information of the vehicle where the first user terminal is located may be further obtained, which is not described in the embodiment of the present invention.
  • the determining unit 21 is configured to determine, according to the driving condition of the first user terminal, whether the driving condition of the first user terminal satisfies the traffic warning condition. Since the driving situation of the first user terminal is used to indicate that the object of the first user terminal is traveling on the road, it may be determined whether the traffic warning condition is met, that is, the object of the first user terminal is determined based on the driving condition of the first user terminal. For the specific judgment process, refer to the related description in the foregoing method embodiment, which is not described in the embodiment of the present invention.
  • the sending unit 22 is configured to: when the driving condition of the first user terminal meets the traffic warning condition, send the warning information, where the warning information is used to trigger the second user terminal to perform an operation corresponding to the warning information, where the second user terminal is based on the first user terminal The driving situation is obtained.
  • the approximate range of the first user terminal is obtained, such as at which intersection, and the time and speed of the vehicle or pedestrian passing through the intersection determined by the first user terminal based on the driving speed and the acceleration, and thus the first user terminal
  • the first user terminal having a driving conflict is the second user terminal. If the second roadside unit in FIG. 1 detects that the pedestrian has an illegal crossing behavior, the first user terminal in the vehicle D and the vehicle E is the second user terminal. At this point the first roadside unit will The warning information is sent to the second user terminal, and the second user terminal will issue an early warning alarm to stop the driver from giving off.
  • the warning alarm can be an audible alarm, a vibration alarm or any other prompting method.
  • the traffic warning device provided by the present invention can obtain the second user terminal based on at least the driving condition of the first user terminal, so that the warning information can be sent only to the second user if the warning information needs to be sent.
  • the terminal causes the other first user terminals to no longer receive the early warning information, so that the other first user terminals that have not received the early warning information can perform the corresponding operations, thereby reducing the probability that other first user terminals perform the wrong operation, that is, the present
  • the above technical solution provided by the invention can specifically transmit the warning information only to the second user terminal, so as to reduce the probability that other first user terminals (the first user terminal not being alerted) perform an erroneous operation.
  • the obtaining unit 20 may include: a first obtaining subunit, a first calculating subunit, a radio frequency subunit, a second calculating subunit, and a third calculating subunit. among them
  • the first obtaining subunit is configured to acquire a probe message that is periodically sent by the first user terminal.
  • the first calculating subunit is configured to obtain the received power corresponding to the probe message after receiving the probe message.
  • the received power can be predicted according to the signal strength. There are various ways to predict the received power according to the signal strength in the prior art, which is not described in the embodiment of the present invention.
  • the radio frequency subunit is configured to send the received power to the other second roadside unit, and receive the received power obtained by the other second roadside unit after receiving the probe message, so that the second roadside unit can obtain the same first user.
  • the received power of the terminal in different second roadside units enables the second roadside unit to compare the plurality of received powers of the same first user terminal to obtain the relative position and the traveling direction of the first user terminal.
  • a second calculating subunit configured to compare the currently obtained multiple received powers to obtain a relative position of the first user terminal, where the currently obtained multiple received powers include the second roadside unit obtained after receiving the probe message Received power and received power obtained by other second roadside units after receiving the probe message.
  • a third calculating sub-unit configured to compare each of the currently received received powers with the received power obtained by receiving the probe message broadcast by the same first user terminal, to obtain a traveling direction of the first user terminal.
  • the manner in which the second computing subunit obtains the relative position and the third computing subunit obtains the traveling direction is the same as the corresponding step in the flowchart shown in FIG. 4, which is not described in the embodiment of the present invention. .
  • the obtaining unit 20 may include: a second obtaining subunit, a fourth calculating subunit, and a fifth calculating subunit.
  • a second obtaining subunit configured to obtain the received power uploaded by the first user terminal, where the received power is obtained by the first user terminal after receiving the probe message periodically broadcasted by the second roadside unit.
  • a fourth calculating subunit configured to compare the currently obtained multiple received powers to obtain a relative position of the first user terminal.
  • a fifth calculating sub-unit configured to compare each of the currently received received powers with the received power obtained by receiving the probe message broadcast by the same second roadside unit last time, to obtain a traveling direction of the first user terminal.
  • each probe message in the foregoing embodiment may be sent by using a pre-agreed transmit power, so that the probe message may not carry the farmer's road. If the transmit power is not agreed in advance, the transmit power needs to be carried in the probe message. The transmit power is used to indicate the power used to send the probe message each time. When the transmit power in the probe message received multiple times is the same, the received power received multiple times can be directly compared; if the received probe message is received, When the transmission powers are different, the received power needs to be processed accordingly and then compared. As shown in FIG.
  • the transmit power of the RSU1 when the probe message is broadcasted at time T0 is 50 dbm, and the received power obtained by the first user terminal is 24 dbm. If the broadcast power is broadcasted at the time T1, the transmit power is 24 bdm, the first user.
  • the receiving power obtained by the terminal is 14 dbm, if the transmitting message does not carry the transmitting power, the obtained driving direction of the first user terminal is far away from the RSU1, but actually is close to the RSU1, so the transmitting power needs to be carried in the probe message.
  • the probe message in the foregoing embodiment may adopt a message in a D2D discovery technology, such as a D2D discovery message or a D2D communication message, and the same first user terminal goes to the second.
  • a D2D discovery technology such as a D2D discovery message or a D2D communication message
  • Various information uploaded by the roadside unit can also be carried and uploaded in the feedback message, wherein the feedback message can also be used.
  • a message in the D2D discovery technology such as a D2D discovery message or a D2D communication message.
  • the reason why the receiving power can be used to obtain the relative position and the driving direction is that the building environment is relatively simple considering that the intersection area is relatively open, so that it can be assumed that the first user terminal in the intersection has a visible route to each RSU, that is, the influence road
  • the biggest factor of loss is distance; it can be assumed that the shadow fading difference due to building occlusion is strongly correlated, that is, the shadow fading value is similar. Therefore, the relative position and the traveling direction of the first user terminal can be obtained by using the received power of the above-mentioned probe message to achieve positioning of the first user terminal, and the method is relative to GPS positioning (Global Positioning System). The technique is simpler and the positioning accuracy is not affected by the distance between the first user terminals.

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Abstract

本发明提供一种交通预警方法、装置及系统，可以至少基于第一用户终端的行驶情况来得到第二用户终端，这样在需要发送预警信息的情况下，可以将预警信息仅发送至第二用户终端，使得其他第一用户终端不再接收预警信息，这样其他未接收到预警信息的第一用户终端则可以执行相对应的操作，降低其他第一用户终端执行错误操作的几率，也就是说本发明提供的上述技术方案可以有针对性的仅向第二用户终端来发送预警信息，以降低其他第一用户终端(未被预警的第一用户终端)执行错误操作的几率。

Description

一种交通预警方法、装置及系统 技术领域
本发明属于车辆网技术领域，更具体的说，尤其涉及一种交通预警方法、装置及系统。
背景技术
车辆网技术是近年发展起来的未来5G(第五代移动通信技术)网络核心技术，3GPP(3rd Generation Partnership Project，第三代合作伙伴计划)与2015年对车辆网技术展开了大量研究工作，并给出了车辆网技术的潜在技术场景。在SA技术报告TR22.885中提出了基于路边单元的交通信息广播系统。如图1所示，在图1所示场景下，要求UE(User Equipment，用户终端)主动向RSU(Road Side Unit，路边单元)发送预警信息的能力，RSU接收到预警信息后，向特定的第一用户终端发送预警广播。
从图1可以看出，预警信息广播无需广播给所有UE，如图针对交叉路口的横向车辆A和车辆B来说，如果这两辆车辆上的UE收到预警信息会造成车辆A和车辆B执行没有必要的错误操作，因此现有系统需要准确识别车辆方位的能力。
发明内容
有鉴于此，本发明提供一种交通预警方法、装置及系统，用于有针对性的向某些第一用户终端发送预警信息，降低其他第一用户终端执行错误操作的几率。技术方案如下：
第一方面，本发明提供一种交通预警方法，所述方法包括：
第一用户终端或网络侧设备获得所述第一用户终端的行驶情况；
网络侧设备基于所述第一用户终端的行驶情况，判断所述第一用户终端的行驶情况是否满足交通预警条件，如果是，网络侧设备向第一路边单元发 送预警信息；
所述第一路边单元基于所述第一用户终端的行驶情况确定接收所述预警信息的第二用户终端，并向所述第二用户终端发送所述预警信息，所述预警信息用于触发所述第二用户终端执行与所述预警信息对应的操作。
优选地，所述网络侧设备包括第二路边单元和安全服务器；
所述第二路边单元获得所述第一用户终端的行驶情况，基于所述第一用户终端的行驶情况，判断所述第一用户终端的行驶情况是否满足交通预警条件，如果是，向第一路边单元发送预警信息；
或者
所述第一用户终端或第二路边单元获得所述第一用户终端的行驶情况；
所述安全服务器基于所述第一用户终端的行驶情况，判断所述第一用户终端的行驶情况是否满足交通预警条件，如果是，向第一路边单元发送预警信息。
优选地，所述第二路边单元或安全服务器基于所述第一用户终端的行驶情况确定所述第一路边单元。
优选地，所述第一用户终端或网络侧设备获得所述第一用户终端的行驶情况，包括：
所述第一用户终端或网络侧设备基于当前得到的多个接收功率，得到所述第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到所述第一用户终端的行驶方向，其中所述接收功率由所述第一用户终端或第二路边单元在接收到探测消息后得到。
优选地，所述第一用户终端或网络侧设备获得所述第一用户终端的行驶情况，包括：所述第一用户终端或网络侧设备获得所述第一用户终端的行驶参数，并基于所述行驶参数得到所述第一用户终端的行驶状态。
优选地，所述第一用户终端基于当前得到的多个接收功率，得到所述第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到所述第一用户终端的行驶方向，包括：
所述第一用户终端接收多个第二路边单元周期性广播发送的探测消息；
所述第一用户终端在接收到各个探测消息后，得到各个探测消息对应的接收功率；
所述第一用户终端将当前得到的多个接收功率进行比较，得到所述第一用户终端的相对位置；
所述第一用户终端将当前得到的每个接收功率分别与上一次接收同一个第二路边单元广播的探测消息后得到的接收功率进行比较，得到所述第一用户终端的行驶方向。
优选地，所述网络侧设备基于当前得到的多个接收功率，得到所述第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到所述第一用户终端的行驶方向，包括：
第二路边单元接收第一用户终端周期性发送的探测消息；
所述第二路边单元在接收到探测消息后，得到所述探测消息对应的接收功率；
所述第二路边单元将得到的接收功率发送至其他第二路边单元，并接收其他第二路边单元在接收到探测消息后得到的接收功率；
所述第二路边单元将当前得到的多个接收功率进行比较，得到所述第一用户终端的相对位置，其中当前得到的多个接收功率包括所述第二路边单元在接收到探测消息后得到的接收功率以及其他第二路边单元在接收到探测消息后得到的接收功率；
所述第二路边单元将当前得到的每个接收功率分别与上一次接收同一个第一用户终端广播的探测消息后得到的接收功率进行比较，得到所述第一用户终端的行驶方向。
第二方面，本发明提供一种交通预警系统，所述系统包括：第一用户终端、网络侧设备、第一路边单元和被第二用户终端；
所述第一用户终端或所网络侧设备，用于得到所述第一用户终端的行驶情况；
所述网络侧设备，用于基于所述第一用户终端的行驶情况，判断所述第一用户终端的行驶情况是否满足交通预警条件，如果是，向第一路边单元发送预警信息；
所述第一路边单元，用于基于所述第一用户终端的行驶情况确定接收所述预警信息的第二用户终端，并向所述第二用户终端发送所述预警信息，所述预警信息用于触发所述第二用户终端执行与所述预警信息对应的操作。
优选地，所述网络侧设备包括第二路边单元和安全服务器；
所述第二路边单元用于获得所述第一用户终端的行驶情况，基于所述第一用户终端的行驶情况，判断所述第一用户终端的行驶情况是否满足交通预警条件，如果是，向第一路边单元发送预警信息；其中所述向第一路边单元发送预警信息包括所述第二路边单元向第一路边单元直接发送预警信息，或者所述第二路边单元经过所述安全服务器向所述第一路边单元发送预警信息。
优选地，所述网络侧设备包括第二路边单元和安全服务器；
所述第二路边单元，用于获得所述第一用户终端的行驶情况；
所述安全服务器，用于基于所述第一用户终端的形式情况，判断所述第一用户终端的行驶情况是否满足交通预警条件，如果是，向第一路边单元发送预警信息。
优选地，所述第一路边单元由所述交通预警系统中的第二路边单元或安全服务器确定。
第三方面，本发明提供一种交通预警方法，所述方法包括：
获得第一用户终端的行驶情况；
基于所述第一用户终端的行驶情况，判断所述第一用户终端的行驶情况是否满足交通预警条件；
当所述第一用户终端的行驶情况满足所述交通预警条件时，发送预警信息，所述预警信息用于触发第二用户终端执行与所述预警信息对应的操作，所述第二用户终端基于所述第一用户终端的行驶情况得到。
优选地，所述获得第一用户终端的行驶情况，包括：基于当前得到的多个接收功率，得到所述第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到所述第一用户终端的行驶方向。
优选地，所述获得第一用户终端的行驶情况，包括：获得所述第一用户终端的行驶参数，并基于所述行驶参数得到所述第一用户终端的行驶状态。
优选地，所述基于当前得到的多个接收功率，得到所述第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到所述第一用户终端的行驶方向，包括：
获取第一用户终端周期性发送的探测消息；
在接收到探测消息后，得到所述探测消息对应的接收功率；
将所述接收功率发送至其他第二路边单元，并接收其他第二路边单元在接收到探测消息后得到的接收功率；
将当前得到的多个接收功率进行比较，得到所述第一用户终端的相对位置，其中当前得到的多个接收功率包括所述第二路边单元在接收到探测消息后得到的接收功率以及其他第二路边单元在接收到探测消息后得到的接收功率；
将当前得到的每个接收功率分别与上一次接收同一个第一用户终端广播的探测消息后得到的接收功率进行比较，得到所述第一用户终端的行驶方向。
优选地，所述基于当前得到的多个接收功率，得到所述第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到所述第一用户终端的行驶方向，包括：
获得第一用户终端上传的接收功率，所述接收功率由第一用户终端在接收到第二路边单元周期性广播发送的探测消息后得到；
将当前得到的多个接收功率进行比较，得到所述第一用户终端的相对位置；
将当前得到的每个接收功率分别与上一次接收同一个第二路边单元广播的探测消息后得到的接收功率进行比较，得到所述第一用户终端的行驶方向。
第四方面，本发明提供一种交通预警装置，所述装置包括：
获得单元，用于获得第一用户终端的行驶情况；
判断单元，用于基于所述第一用户终端的行驶情况，判断所述第一用户终端的行驶情况是否满足交通预警条件；
发送单元，用于当所述第一用户终端的行驶情况满足所述交通预警条件时，发送预警信息，所述预警信息用于触发第二用户终端执行与所述预警信息对应的操作，所述第二用户终端基于所述第一用户终端的行驶情况得到。
优选地，所述获得单元，用于基于当前得到的多个接收功率，得到所述第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到所述第一用户终端的行驶方向。
优选地，所述获得单元，用于获得所述第一用户终端的行驶参数，并基于所述行驶参数得到所述第一用户终端的行驶状态。
优选地，所述获得单元包括：
第一获取子单元，用于获取第一用户终端周期性发送的探测消息；
第一计算子单元，用于在接收到探测消息后，得到所述探测消息对应的接收功率；
射频子单元，用于将所述接收功率发送至其他第二路边单元，并接收其他第二路边单元在接收到探测消息后得到的接收功率；
第二计算子单元，用于将当前得到的多个接收功率进行比较，得到所述第一用户终端的相对位置，其中当前得到的多个接收功率包括所述第二路边单元在接收到探测消息后得到的接收功率以及其他第二路边单元发送的接收功率；
第三计算子单元，用于将当前得到的每个接收功率分别与上一次接收同一个第一用户终端广播的探测消息后得到的接收功率进行比较，得到所述第一用户终端的行驶方向。
优选地，所述获得单元包括：
第二获取子单元，用于获得第一用户终端上传的接收功率，所述接收功 率由第一用户终端在接收到第二路边单元周期性广播发送的探测消息后得到；
第四计算子单元，用于将当前得到的多个接收功率进行比较，得到所述第一用户终端的相对位置；
第五计算子单元，用于将当前得到的每个接收功率分别与上一次接收同一个第二路边单元广播的探测消息后得到的接收功率进行比较，得到所述第一用户终端的行驶方向。
与现有技术相比，本发明提供的上述技术方案具有如下优点：
本发明提供的上述技术方案中，可以至少基于第一用户终端的行驶情况来得到第二用户终端，这样在需要发送预警信息的情况下，可以将预警信息仅发送至第二用户终端，使得其他第一用户终端不再接收预警信息，这样其他未接收到预警信息的第一用户终端则可以执行相对应的操作，降低其他第一用户终端执行错误操作的几率，也就是说本发明提供的上述技术方案可以有针对性的仅向第二用户终端来发送预警信息，以降低其他第一用户终端(未被预警的第一用户终端)执行错误操作的几率。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1是现有基于路边单元的交通信息广播系统的示意图；
图2是本发明实施例提供的交通预警方法的一种流程图；
图3是本发明实施例提供的一种交通场景的示意图；
图4是本发明实施例提供的交通预警方法中得到第一用户终端的行驶情况的一种流程图；
图5是本发明实施例提供的交通预警方法中得到第一用户终端的行驶情况的另一种流程图；
图6是本发明实施例提供的交通预警系统的结构示意图；
图7是本发明实施例提供的另一种交通预警方法的流程图；
图8是图7所示交通预警方法中得到第一用户终端的相对位置和行驶方向的一种流程图；
图9是图7所示交通预警方法中得到第一用户终端的相对位置和行驶方向的另一种流程图；
图10是本发明实施例提供的交通预警装置的结构示意图。
具体实施方式
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
请参阅图2，其示出了本发明实施例提供的交通预警方法的信令交互图，可以包括以下步骤：
101：第一用户终端UE或网络侧设备获得第一用户终端的行驶情况。其中网络侧设备可以是RSU，第一用户终端的行驶情况用于指示第一用户终端所在对象在道路上行驶的情况，例如指示第一用户终端所在车辆在道路上的行驶方向和行驶状态(处于加速状态还是减速状态)。
在本发明实施例中，第一用户终端或网络侧设备可以基于当前得到的多个接收功率，得到第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到第一用户终端的行驶方向，其中接收功率由第一用户终端或网络侧设备在接收到探测消息后得到。
也就是说在本发明实施例中，第一用户终端的相对位置和行驶方向可以由第一用户终端自身获得，也可以网络侧设备获得。即第一用户终端可以分为终端主动型和终端被动型，对于终端主动型的第一用户终端来说，第一用户终端可以自主得到第一用户终端的相对位置和行驶方向，又或者对于终端 主动型的第一用户终端来说，第一用户终端可以自主得到接收网络侧设备发送的探测消息对应的接收功率，然后将第一用户终端得到的接收功率发送给网络侧设备，由网络侧设备来得到第一用户终端的相对位置和行驶方向。对于终端被动型的第一用户终端来说，第一用户终端可以向网络侧设备周期性发送探测消息，由网络侧设备来得到第一用户终端的相对位置和行驶方向。
除相对位置和行驶方向之外，行驶情况还可以包括其他信息，如行驶状态，所述行驶状态至少用于指示第一用户终端处于加速状态还是减速状态，在本发明实施例中行驶状态可以基于第一用户终端的行驶参数获得。其中行驶参数至少包括：行驶速度和加速度，所述行驶速度可以由安装在第一用户终端中的速度传感器得到，所述加速度则可以由安装在第一用户终端中的加速度传感器得到。基于行驶速度和加速度，尤其是加速度可以判断出当前第一用户终端所在对象处于加速状态还是减速状态。当然，除行驶速度和加速度来得到第一用户终端的行驶状态之外，还可以进一步基于第一用户终端所在车辆的刹车指示信息来得到，具体本发明实施例不再进行阐述。
102：网络侧设备基于第一用户终端的行驶情况，判断第一用户终端的行驶情况是否满足交通预警条件，如果是，网络侧设备向第一路边单元发送预警信息。
由于第一用户终端的行驶情况用于指示第一用户终端所在对象在道路上行驶的情况，所以可以基于第一用户终端的行驶情况来判断是否满足交通预警条件，即判断第一用户终端所在对象是否正在处于违法行驶中。
例如基于行驶情况中的行驶方向和相对位置可以得到第一用户终端所在对象正朝哪个方向行驶，那么其有可能会与行驶方向冲突的对象发生碰撞，因此基于行驶方向和相对位置可以判断第一用户终端的行驶情况是否满足交通预警条件。如图1所示应用场景，行人佩戴的第一用户终端获得的行驶情况指示行人正在穿越马路，而且交通信息表明行人是违法穿红灯，这样经过行人所在路口的车辆可能会与其发生碰撞，此时则可以判断第一用户终端的行驶情况满足交通预警条件。
并且为了提高判断准确度，本发明实施例在行驶方向和相对位置上结合行驶状态来评估第一用户终端所在对象多久通过路口，是处于加速状态还是减速状态，这样网络侧设备则可以基于此来判断是否满足交通预警条件来发送预警信息。网络侧设备还可以进一步结合交通信息来判断是否满足交通预警条件，如在得到第一用户终端的行驶情况后，结合当前路口的交通灯是红灯绿灯来判断是否满足交通预警条件，如果第一用户终端所在对象的相对位置指示车辆或者行人处于路口范围内，正处于加速状态向路口方向移动，并且目前路口的交通灯是红灯，则说明车辆或者行人要闯红灯穿越，因此此时可以判断满足交通预警条件，发送预警信息以指示其他车辆注意违规穿越的行为。
在本发明实施例中，网络侧设备至少包括第二路边单元和安全服务器，第二路边单元和安全服务器的工作过程可以有以下几种方式，在实际应用过程中，其可以选用任意一种方式来执行：
一种方式是第二路边单元获得第一用户终端的行驶情况，并判断第一用户终端的行驶情况是否满足交通预警条件，如果是第二路边单元基于第一用户终端的行驶情况确定第一路边单元，将预警信息发送给第一路边单元；
另一种方式是：第二路边单元获得第一用户终端的行驶情况，并判断第一用户终端的行驶情况是否满足交通预警条件，如果是，将所述第一用户终端的行驶情况发送给安全服务器。安全服务器基于第一用户终端的行驶情况确定第一路边单元，并将预警信息发送给第一路边单元；
再一种方式是：第二路边单元获得第一用户终端的行驶情况，判断第一用户终端的行驶情况是否满足交通预警条件，如果是第二路边单元基于第一用户终端的行驶情况确定第一路边单元，并触发安全服务器将预警信息发送给第一路边单元；
其他方式是：第二路边单元将获得第一用户终端的行驶情况所需信息，如接收功率等发送给安全服务器，由安全服务器获得第一用户终端的行驶情况，判断第一用户终端的行驶情况是否满足交通预警条件，如果是安全服务 器基于第一用户终端的行驶情况确定第一路边单元，并将预警信息发送给第一路边单元。
上述第一路边单元是用于向其他可能会和正在违规的车辆或行人发生事故的第一用户终端发送预警信息的第二路边单元。在本发明实施例中，获得第一路边单元的方式可以是：第二路边单元或者安全服务器根据预警用户终端的相对位置来获得第二用户终端所在位置，然后基于各个第二路边单元的位置信息来获得第二用户终端所属的第二路边单元，这样第二用户终端所属的第二路边单元即是第一路边单元。其中预警用户终端是上述满足交通预警条件的第一用户终端，第二用户终端所属的第二路边单元则是信号范围覆盖第二用户终端的第二路边单元。
当第二用户终端所属的第二路边单元包括多个时，可以选取任意一个第二路边单元为第一路边单元；当然也有可能判断出需要发送预警信息的第二路边单元和需要向第二用户终端发送预警信息的第一路边单元为同一个第二路边单元，在此种情况下，如果是由安全服务器得到第一路边单元，则安全服务器会将预警信息回传给第二路边单元，如果是由第二路边单元得到第一路边单元，则可以由第二路边单元直接向第二用户终端发送预警信息。
103：第一路边单元基于第一用户终端的行驶情况确定接收预警信息的第二用户终端，并向第二用户终端发送预警信息，预警信息用于触发第二用户终端执行与预警信息对应的操作。
在本发明实施例中，第一路边单元可以基于相对位置和行驶方向来得到第一用户终端的大概范围，如位于哪个路口，以及第一路边单元还可以基于行驶速度和加速度确定第一用户终端所在车辆或者行人通过路口的时间和速度，这样与第一用户终端具有行驶冲突的第一用户终端则是第二用户终端。如图1中第二路边单元检测出行人存在违法穿越行为，则车辆D和车辆E中的第一用户终端为第二用户终端。此时第一路边单元将预警信息发送给第二用户终端，此时第二用户终端则会发出预警警报，使驾驶员停车让行。其中预警警报可以声音报警，震动报警或其他任何提示方式。
从上述技术方案可知，本发明提供的交通预警方法可以至少基于第一用户终端的行驶情况来得到第二用户终端，这样在需要发送预警信息的情况下，可以将预警信息仅发送至第二用户终端，使得其他第一用户终端不再接收预警信息，这样其他未接收到预警信息的第一用户终端则可以执行相对应的操作，降低其他第一用户终端执行错误操作的几率，也就是说本发明提供的上述技术方案可以有针对性的仅向第二用户终端来发送预警信息，以降低其他第一用户终端(未被预警的第一用户终端)执行错误操作的几率。
下面以图3所示交通场景示意图，对上述第一用户终端或网络侧设备基于接收功率得到第一用户终端的行驶情况进行说明。在图3中示出了网络侧设备为四个第二路边单元，分别记为RSU1、RSU2、RSU3和RSU4。对于第一用户终端来主动得到行驶情况来说明，其流程图如图4所示，可以包括以下步骤：
201：第一用户终端接收多个第二路边单元周期性广播发送的探测消息。
202：第一用户终端在接收到各个探测消息后，得到各个探测消息对应的接收功率。其中接收功率可以依据信号强度进行预测，在现有技术中已有多种依据信号强度预测接收功率的方式，对此本发明实施例不再阐述。
203：第一用户终端将当前得到的多个接收功率进行比较，得到第一用户终端的相对位置。得到位置信息的方法是比较多个信号之间的信号差。即第一用户终端根据得到的多个接收功率之差来得到第一用户终端的相对位置，以图3为例，第一用户终端得到RSU1、RSU2、RSU3和RSU4发送的探测消息的接收功率分别是：A1、A2、A3和A4。
如果经过比较发现：A1>A2则说明第一用户终端靠近RSU1一侧，若在A1>A2的情况下A1>A3且A1>A4，并且A2和A1都远大于A3和A4则说明第一用户终端在靠近RSU1且远离RSU3和RSU4一侧，因此在将多个接收功率进行比较后则可得到第一用户终端的相对位置。当然还可以基于发射功率和接收功率来定位第一用户终端的相对位置。
204：第一用户终端将当前得到的每个接收功率分别与上一次接收同一个 第二路边单元广播的探测消息后得到的接收功率进行比较，得到第一用户终端的行驶方向。也就是说第一用户终端根据接多个RSU发送的探测消息在多次测量过程中接收功率的变化趋势，判断UE靠近或远离各RSU的位置，从而判断行驶方向。并且需要注意一点的是：在对多个RSU发送的探测消息在多次测量中得到的接收功率的变化趋势进行比较时，是将同一个第二路边单元发送的探测消息的比较。
仍以图3为例，在T0时刻得到的接收功率分别为A1’、A2’、A3’、A4’，与T1时刻得到的接收功率A1、A2、A3、A4比较，当A1’<A1、A2’<A2、A3’<A3和A4’<A4，则可以判断第一用户终端是向靠近RSU1大方向移动，且逐渐靠近RSU3和RSU4的方向。当然，如果发现A1’>A1，A2’>A2但A3’<A3、A4’<A4，则可以说明第一用户终端朝向RSU3和RSU4，但是已经行驶远离了RSU1和RSU2的所在位置。通过这种方式可以判断出第一用户终端大概的行驶方向，且可以指示第一用户终端是向路口驶来还是已驶离路口。
如图5所示，其示出了当网络侧设备为第二路边单元时，第二路边单元得到第一用户终端的行驶情况的流程，可以包括以下步骤：
301：第二路边单元接收第一用户终端周期性发送的探测消息。
302：第二路边单元在接收到探测消息后，得到探测消息对应的接收功率。
303：第二路边单元将接收功率发送至其他第二路边单元，并接收其他第二路边单元在接收到探测消息后得到的接收功率，这样第二路边单元可以得到同一个第一用户终端在不同第二路边单元中的接收功率，使得第二路边单元可以对同一个第一用户终端的多个接收功率进行比较来得到第一用户终端的相对位置和行驶方向。
304：第二路边单元将当前得到的多个接收功率进行比较，得到第一用户终端的相对位置，其中当前得到的多个接收功率包括第二路边单元在接收到探测消息后得到的接收功率以及其他第二路边单元在接收到探测消息后得到的接收功率。
305：第二路边单元将当前得到的每个接收功率分别与上一次接收同一个 第一用户终端广播的探测消息后得到的接收功率进行比较，得到第一用户终端的行驶方向。
在本发明实施例中，第二路边单元得到行驶情况中相对位置和行驶方向的方式与上述图4所示流程图中相对应的步骤相同，对此本发明实施例不再阐述。当然除上述接收功率之外，本发明实施例还可以采用时间差来得到相对位置和行驶方向，其中时间差为同一个探测消息的发送时间和接收时间的差值，通过其同样可以采用接收功率的原理来得出相对位置和行驶方向，本发明实施例不再详述。
与上述图1所示方法实施例相对应，本发明实施例还提供一种交通预警系统，如图6所示，可以包括：第一用户终端11、网络侧设备12、第一路边单元13和第二用户终端14。
第一用户终端11或网络侧设备12，用于获得第一用户终端的行驶情况。其中第一用户终端的行驶情况用于指示第一用户终端所在对象在道路上行驶的情况，例如指示第一用户终端所在车辆在道路上的行驶方向和行驶状态(处于加速状态还是减速状态)。
在本发明实施例中，第一用户终端或网络侧设备可以基于当前得到的多个接收功率，得到第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到第一用户终端的行驶方向，其中接收功率由第一用户终端或网络侧设备在接收到探测消息后得到，具体可以参阅上述图4和图5所示流程图。
除相对位置和行驶方向之外，行驶情况还可以包括其他信息，如行驶状态，所述行驶状态至少用于指示第一用户终端处于加速状态还是减速状态，在本发明实施例中行驶状态可以基于第一用户终端的行驶参数获得。其中行驶参数至少包括：行驶速度和加速度，所述行驶速度可以由安装在第一用户终端中的速度传感器得到，所述加速度则可以由安装在第一用户终端中的加速度传感器得到。基于行驶速度和加速度，尤其是加速度可以判断出当前第 一用户终端所在对象处于加速状态还是减速状态。当然，除行驶速度和加速度来得到第一用户终端的行驶状态之外，还可以进一步基于第一用户终端所在车辆的刹车指示信息来得到，具体本发明实施例不再进行阐述。
网络侧设备12，用于基于第一用户终端的行驶情况，判断第一用户终端的行驶情况是否满足交通预警条件，如果是，向第一路边单元发送预警信息。由于第一用户终端的行驶情况用于指示第一用户终端所在对象在道路上行驶的情况，所以可以基于第一用户终端的行驶情况来判断是否满足交通预警条件，即判断第一用户终端所在对象是否正在处于违法行驶中。
例如基于行驶情况中的行驶方向和相对位置可以得到第一用户终端所在对象正朝哪个方向行驶，那么其有可能会与行驶方向冲突的对象发生碰撞，因此基于行驶方向和相对位置可以判断第一用户终端的行驶情况是否满足交通预警条件。如图1所示应用场景，行人佩戴的第一用户终端获得的行驶情况指示行人正在穿越马路，而且交通信息表明行人是违法穿红灯，这样经过行人所在路口的车辆可能会与其发生碰撞，此时则可以判断第一用户终端的行驶情况满足交通预警条件。
并且为了提高判断准确度，本发明实施例在行驶方向和相对位置上结合行驶状态来评估第一用户终端所在对象多久通过路口，是处于加速状态还是减速状态，这样网络侧设备则可以基于此来判断是否满足交通预警条件来发送预警信息。网络侧设备还可以进一步结合交通信息来判断是否满足交通预警条件，如在得到第一用户终端的行驶情况后，结合当前路口的交通灯是红灯绿灯来判断是否满足交通预警条件，如果第一用户终端所在对象的相对位置指示车辆或者行人处于路口范围内，正处于加速状态向路口方向移动，并且目前路口的交通灯是红灯，则说明车辆或者行人要闯红灯穿越，因此此时可以判断满足交通预警条件，发送预警信息以指示其他车辆注意违规穿越的行为。
在本发明实施例中，网络侧设备至少包括第二路边单元和安全服务器，第二路边单元和安全服务器的工作过程可以有以下几种方式，在实际应用过 程中，其可以选用任意一种方式来执行：
一种方式是第二路边单元获得第一用户终端的行驶情况，并判断第一用户终端的行驶情况是否满足交通预警条件，如果是第二路边单元基于第一用户终端的行驶情况确定第一路边单元，将预警信息发送给第一路边单元；
另一种方式是：第二路边单元获得第一用户终端的行驶情况，并判断第一用户终端的行驶情况是否满足交通预警条件，如果是，将所述第一用户终端的行驶情况发送给安全服务器。安全服务器基于第一用户终端的行驶情况确定第一路边单元，并将预警信息发送给第一路边单元；
再一种方式是：第二路边单元获得第一用户终端的行驶情况，判断第一用户终端的行驶情况是否满足交通预警条件，如果是第二路边单元基于第一用户终端的行驶情况确定第一路边单元，并触发安全服务器将预警信息发送给第一路边单元；
其他方式是：第二路边单元将获得第一用户终端的行驶情况所需信息，如接收功率等发送给安全服务器，由安全服务器获得第一用户终端的行驶情况，判断第一用户终端的行驶情况是否满足交通预警条件，如果是安全服务器基于第一用户终端的行驶情况确定第一路边单元，并将预警信息发送给第一路边单元。
上述第一路边单元是用于向其他可能会和正在违规的车辆或行人发生事故的第一用户终端发送预警信息的第二路边单元。在本发明实施例中，获得第一路边单元的方式可以是：第二路边单元或者安全服务器根据预警用户终端的相对位置来获得第二用户终端所在位置，然后基于各个第二路边单元的位置信息来获得第二用户终端所属的第二路边单元，这样第二用户终端所属的第二路边单元即是第一路边单元。其中预警用户终端是上述满足交通预警条件的第一用户终端，第二用户终端所属的第二路边单元则是信号范围覆盖第二用户终端的第二路边单元。
当第二用户终端所属的第二路边单元包括多个时，可以选取任意一个第二路边单元为第一路边单元；当然也有可能判断出需要发送预警信息的第二 路边单元和需要向第二用户终端发送预警信息的第一路边单元为同一个第二路边单元，在此种情况下，如果是由安全服务器得到第一路边单元，则安全服务器会将预警信息回传给第二路边单元，如果是由第二路边单元得到第一路边单元，则可以由第二路边单元直接向第二用户终端发送预警信息。
第一路边单元13，用于基于第一用户终端的行驶情况确定接收预警信息的第二用户终端，并向第二用户终端发送预警信息，预警信息用于触发第二用户终端执行与预警信息对应的操作。
在本发明实施例中，第一路边单元可以基于相对位置和行驶方向来得到第一用户终端的大概范围，如位于哪个路口，以及第一路边单元还可以基于行驶速度和加速度确定第一用户终端所在车辆或者行人通过路口的时间和速度，这样与第一用户终端具有行驶冲突的第一用户终端则是第二用户终端。如图1中第二路边单元检测出行人存在违法穿越行为，则车辆D和车辆E中的第一用户终端为第二用户终端。此时第一路边单元将预警信息发送给第二用户终端，此时第二用户终端则会发出预警警报，使驾驶员停车让行。其中预警警报可以声音报警，震动报警或其他任何提示方式。
从上述技术方案可知，本发明提供的交通预警系统可以至少基于第一用户终端的行驶情况来得到第二用户终端，这样在需要发送预警信息的情况下，可以将预警信息仅发送至第二用户终端，使得其他第一用户终端不再接收预警信息，这样其他未接收到预警信息的第一用户终端则可以执行相对应的操作，降低其他第一用户终端执行错误操作的几率，也就是说本发明提供的上述技术方案可以有针对性的仅向第二用户终端来发送预警信息，以降低其他第一用户终端(未被预警的第一用户终端)执行错误操作的几率。
请参阅图7，其示出了本发明实施例提供的另一种交通预警方法的流程图，可以包括以下步骤：
701：获得第一用户终端的行驶情况。其中第一用户终端的行驶情况用于指示第一用户终端所在对象在道路上行驶的情况，例如指示第一用户终端所 在车辆在道路上的行驶方向和行驶状态(处于加速状态还是减速状态)。
在本发明实施例中，第一用户终端或网络侧设备可以基于当前得到的多个接收功率，得到第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到第一用户终端的行驶方向，其中接收功率由第一用户终端或网络侧设备在接收到探测消息后得到。
也就是说在本发明实施例中，第一用户终端的相对位置和行驶方向可以由第一用户终端自身获得，也可以网络侧设备获得。即第一用户终端可以分为终端主动型和终端被动型，对于终端主动型的第一用户终端来说，第一用户终端可以自主得到第一用户终端的相对位置和行驶方向，并将相对位置和行驶方向发送给网络侧设备，又或者对于终端主动型的第一用户终端来说，第一用户终端可以自主得到接收网络侧设备发送的探测消息对应的接收功率，然后将第一用户终端得到的接收功率发送给网络侧设备，由网络侧设备来得到第一用户终端的相对位置和行驶方向。对于终端被动型的第一用户终端来说，第一用户终端可以向网络侧设备周期性发送探测消息，由网络侧设备来得到第一用户终端的相对位置和行驶方向。
除相对位置和行驶方向之外，行驶情况还可以包括其他信息，如行驶状态，所述行驶状态至少用于指示第一用户终端处于加速状态还是减速状态，在本发明实施例中行驶状态可以基于第一用户终端的行驶参数获得。其中行驶参数至少包括：行驶速度和加速度，所述行驶速度可以由安装在第一用户终端中的速度传感器得到，所述加速度则可以由安装在第一用户终端中的加速度传感器得到。基于行驶速度和加速度，尤其是加速度可以判断出当前第一用户终端所在对象处于加速状态还是减速状态。当然，除行驶速度和加速度来得到第一用户终端的行驶状态之外，还可以进一步基于第一用户终端所在车辆的刹车指示信息来得到，具体本发明实施例不再进行阐述。
702：基于第一用户终端的行驶情况，判断第一用户终端的行驶情况是否满足交通预警条件。
703：当第一用户终端的行驶情况满足交通预警条件时，发送预警信息。 其中预警信息用于触发第二用户终端执行与预警信息对应的操作，被预警信息第一用户终端基于第一用户终端的行驶情况得到。
由于第一用户终端的行驶情况用于指示第一用户终端所在对象在道路上行驶的情况，所以可以基于第一用户终端的行驶情况来判断是否满足交通预警条件，即判断第一用户终端所在对象是否正在处于违法行驶中。
例如基于行驶情况中的行驶方向和相对位置可以得到第一用户终端所在对象正朝哪个方向行驶，那么其有可能会与行驶方向冲突的对象发生碰撞，因此基于行驶方向和相对位置可以判断第一用户终端的行驶情况是否满足交通预警条件。如图1所示应用场景，行人佩戴的第一用户终端获得的行驶情况指示行人正在穿越马路，而且交通信息表明行人是违法穿红灯，这样经过行人所在路口的车辆可能会与其发生碰撞，此时则可以判断第一用户终端的行驶情况满足交通预警条件。
并且为了提高判断准确度，本发明实施例在行驶方向和相对位置上结合行驶状态来评估第一用户终端所在对象多久通过路口，是处于加速状态还是减速状态，这样网络侧设备则可以基于此来判断是否满足交通预警条件来发送预警信息。网络侧设备还可以进一步结合交通信息来判断是否满足交通预警条件，如在得到第一用户终端的行驶情况后，结合当前路口的交通灯是红灯绿灯来判断是否满足交通预警条件，如果第一用户终端所在对象的相对位置指示车辆或者行人处于路口范围内，正处于加速状态向路口方向移动，并且目前路口的交通灯是红灯，则说明车辆或者行人要闯红灯穿越，因此此时可以判断满足交通预警条件，发送预警信息以指示其他车辆注意违规穿越的行为。
在本发明实施例中，网络侧设备至少包括第二路边单元和安全服务器，第二路边单元和安全服务器的工作过程可以有以下几种方式，在实际应用过程中，其可以选用任意一种方式来执行：
一种方式是第二路边单元获得第一用户终端的行驶情况，并判断第一用户终端的行驶情况是否满足交通预警条件，如果是第二路边单元基于第一用 户终端的行驶情况确定第一路边单元，将预警信息发送给第一路边单元；
另一种方式是：第二路边单元获得第一用户终端的行驶情况，并判断第一用户终端的行驶情况是否满足交通预警条件，如果是，将所述第一用户终端的行驶情况发送给安全服务器。安全服务器基于第一用户终端的行驶情况确定第一路边单元，并将预警信息发送给第一路边单元；
再一种方式是：第二路边单元获得第一用户终端的行驶情况，判断第一用户终端的行驶情况是否满足交通预警条件，如果是第二路边单元基于第一用户终端的行驶情况确定第一路边单元，并触发安全服务器将预警信息发送给第一路边单元；
其他方式是：第二路边单元将获得第一用户终端的行驶情况所需信息，如接收功率等发送给安全服务器，由安全服务器获得第一用户终端的行驶情况，判断第一用户终端的行驶情况是否满足交通预警条件，如果是安全服务器基于第一用户终端的行驶情况确定第一路边单元，并将预警信息发送给第一路边单元。
上述第一路边单元是用于向其他可能会和正在违规的车辆或行人发生事故的第一用户终端发送预警信息的第二路边单元。在本发明实施例中，获得第一路边单元的方式可以是：第二路边单元或者安全服务器根据预警用户终端的相对位置来获得第二用户终端所在位置，然后基于各个第二路边单元的位置信息来获得第二用户终端所属的第二路边单元，这样第二用户终端所属的第二路边单元即是第一路边单元。其中预警用户终端是上述满足交通预警条件的第一用户终端，第二用户终端所属的第二路边单元则是信号范围覆盖第二用户终端的第二路边单元。
当第二用户终端所属的第二路边单元包括多个时，可以选取任意一个第二路边单元为第一路边单元；当然也有可能判断出需要发送预警信息的第二路边单元和需要向第二用户终端发送预警信息的第一路边单元为同一个第二路边单元，在此种情况下，如果是由安全服务器得到第一路边单元，则安全服务器会将预警信息回传给第二路边单元，如果是由第二路边单元得到第一 路边单元，则可以由第二路边单元直接向第二用户终端发送预警信息。
在本发明实施例中，第一路边单元可以基于相对位置和行驶方向来得到第一用户终端的大概范围，如位于哪个路口，以及第一路边单元还可以基于行驶速度和加速度确定第一用户终端所在车辆或者行人通过路口的时间和速度，这样与第一用户终端具有行驶冲突的第一用户终端则是第二用户终端。如图1中第二路边单元检测出行人存在违法穿越行为，则车辆D和车辆E中的第一用户终端为第二用户终端。此时第一路边单元将预警信息发送给第二用户终端，此时第二用户终端则会发出预警警报，使驾驶员停车让行。其中预警警报可以声音报警，震动报警或其他任何提示方式。
从上述技术方案可知，本发明提供的交通预警方法可以至少基于第一用户终端的行驶情况来得到第二用户终端，这样在需要发送预警信息的情况下，可以将预警信息仅发送至第二用户终端，使得其他第一用户终端不再接收预警信息，这样其他未接收到预警信息的第一用户终端则可以执行相对应的操作，降低其他第一用户终端执行错误操作的几率，也就是说本发明提供的上述技术方案可以有针对性的仅向第二用户终端来发送预警信息，以降低其他第一用户终端(未被预警的第一用户终端)执行错误操作的几率。
在本发明实施例中，获得上述相对位置和行驶方向的方式可以包括但不限于下述图8图9所示流程图。其中图8示出了本发明实施例中获得上述相对位置和行驶方向的一种方式，可以包括以下步骤：
801：获取第一用户终端周期性发送的探测消息。
802：在接收到探测消息后，得到探测消息对应的接收功率。其中接收功率可以依据信号强度进行预测，在现有技术中已有多种依据信号强度预测接收功率的方式，对此本发明实施例不再阐述。
803：将接收功率发送至其他第二路边单元，并接收其他第二路边单元在接收到探测消息好得到的接收功率，这样第二路边单元可以得到同一个第一用户终端在不同第二路边单元中的接收功率，使得第二路边单元可以对同一个第一用户终端的多个接收功率进行比较来得到第一用户终端的相对位置和 行驶方向。
804：将当前得到的多个接收功率进行比较，得到第一用户终端的相对位置，其中当前得到的多个接收功率包括第二路边单元在接收到探测消息后得到的接收功率以及其他第二路边单元在接收到探测消息后得到的接收功率。
805：将当前得到的每个接收功率分别与上一次接收同一个第一用户终端广播的探测消息后得到的接收功率进行比较，得到第一用户终端的行驶方向。
在本发明实施例中，第二路边单元得到相对位置和行驶方向的方式与上述图4所示流程图中相对应的步骤相同，对此本发明实施例不再阐述。
请参阅图9，其示出了本发明实施例中获得上述相对位置和行驶方向的另一种方式，可以包括以下步骤：
901：获得第一用户终端上传的接收功率，接收功率由第一用户终端在接收到第二路边单元周期性广播发送的探测消息后得到。
902：将当前得到的多个接收功率进行比较，得到第一用户终端的相对位置。
903：将当前得到的每个接收功率分别与上一次接收同一个第二路边单元广播的探测消息后得到的接收功率进行比较，得到第一用户终端的行驶方向。
在本发明实施例中，第二路边单元得到相对位置和行驶方向的方式与上述图4所示流程图中相对应的步骤相同，对此本发明实施例不再阐述。
与上述图7所示方法实施例相对应，本发明实施例还提供一种交通预警装置，其结构示意图如图10所示，可以包括：获得单元20、判断单元21和发送单元22。
获得单元20，用于获得第一用户终端的行驶情况。其中第一用户终端的行驶情况用于指示第一用户终端所在对象在道路上行驶的情况，例如指示第一用户终端所在车辆在道路上的行驶方向和行驶状态(处于加速状态还是减速状态)。
在本发明实施例中，获得单元可以基于当前得到的多个接收功率，得到第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到第一用户终端的行驶方向，其中接收功率由第一用户终端或网络侧设备在接收到探测消息后得到。
除相对位置和行驶方向之外，行驶情况还可以包括其他信息，如行驶状态，所述行驶状态至少用于指示第一用户终端处于加速状态还是减速状态，在本发明实施例中行驶状态可以基于第一用户终端的行驶参数获得。其中行驶参数至少包括：行驶速度和加速度，所述行驶速度可以由安装在第一用户终端中的速度传感器得到，所述加速度则可以由安装在第一用户终端中的加速度传感器得到。基于行驶速度和加速度，尤其是加速度可以判断出当前第一用户终端所在对象处于加速状态还是减速状态。当然，除行驶速度和加速度来得到第一用户终端的行驶状态之外，还可以进一步基于第一用户终端所在车辆的刹车指示信息来得到，具体本发明实施例不再进行阐述。
判断单元21，用于基于第一用户终端的行驶情况，判断第一用户终端的行驶情况是否满足交通预警条件。由于第一用户终端的行驶情况用于指示第一用户终端所在对象在道路上行驶的情况，所以可以基于第一用户终端的行驶情况来判断是否满足交通预警条件，即判断第一用户终端所在对象是否正在处于违法行驶中，具体判断过程可以参阅上述方法实施例中的相关说明，对此本发明实施例不再阐述。
发送单元22，用于当第一用户终端的行驶情况满足交通预警条件时，发送预警信息，预警信息用于触发第二用户终端执行与预警信息对应的操作，第二用户终端基于第一用户终端的行驶情况得到。
例如基于相对位置和行驶方向来得到第一用户终端的大概范围，如位于哪个路口，以及基于行驶速度和加速度确定第一用户终端所在车辆或者行人通过路口的时间和速度，这样与第一用户终端具有行驶冲突的第一用户终端则是第二用户终端。如图1中第二路边单元检测出行人存在违法穿越行为，则车辆D和车辆E中的第一用户终端为第二用户终端。此时第一路边单元将 预警信息发送给第二用户终端，此时第二用户终端则会发出预警警报，使驾驶员停车让行。其中预警警报可以声音报警，震动报警或其他任何提示方式。
从上述技术方案可知，本发明提供的交通预警装置可以至少基于第一用户终端的行驶情况来得到第二用户终端，这样在需要发送预警信息的情况下，可以将预警信息仅发送至第二用户终端，使得其他第一用户终端不再接收预警信息，这样其他未接收到预警信息的第一用户终端则可以执行相对应的操作，降低其他第一用户终端执行错误操作的几率，也就是说本发明提供的上述技术方案可以有针对性的仅向第二用户终端来发送预警信息，以降低其他第一用户终端(未被预警的第一用户终端)执行错误操作的几率。
在本发明实施例中获得单元20可以包括：第一获得子单元、第一计算子单元、射频子单元、第二计算子单元和第三计算子单元。其中
第一获得子单元，用于获取第一用户终端周期性发送的探测消息。
第一计算子单元，用于在接收到探测消息后，得到探测消息对应的接收功率。其中接收功率可以依据信号强度进行预测，在现有技术中已有多种依据信号强度预测接收功率的方式，对此本发明实施例不再阐述。
射频子单元，用于将接收功率发送至其他第二路边单元，并接收其他第二路边单元在接收到探测消息后得到的接收功率，这样第二路边单元可以得到同一个第一用户终端在不同第二路边单元中的接收功率，使得第二路边单元可以对同一个第一用户终端的多个接收功率进行比较来得到第一用户终端的相对位置和行驶方向。
第二计算子单元，用于将当前得到的多个接收功率进行比较，得到第一用户终端的相对位置，其中当前得到的多个接收功率包括第二路边单元在接收到探测消息后得到的接收功率以及其他第二路边单元在接收到探测消息后得到的接收功率。
第三计算子单元，用于将当前得到的每个接收功率分别与上一次接收同一个第一用户终端广播的探测消息后得到的接收功率进行比较，得到第一用户终端的行驶方向。
在本发明实施例中，第二计算子单元得到相对位置和第三计算子单元得到行驶方向的方式与上述图4所示流程图中相对应的步骤相同，对此本发明实施例不再阐述。
又或者在本发明实施例中，上述获得单元20可以包括：第二获得子单元、第四计算子单元和第五计算子单元。
第二获得子单元，用于获得第一用户终端上传的接收功率，接收功率由第一用户终端在接收到第二路边单元周期性广播发送的探测消息后得到。
第四计算子单元，用于将当前得到的多个接收功率进行比较，得到第一用户终端的相对位置。
第五计算子单元，用于将当前得到的每个接收功率分别与上一次接收同一个第二路边单元广播的探测消息后得到的接收功率进行比较，得到第一用户终端的行驶方向。
在此需要说明一点：在本发明实施例中，上述实施例中各个探测消息可以采用预先约定好的发射功率来发送，这样探测消息中可以不携带发送工农路。若预先并未约定好发射功率，则需要在探测消息中携带发射功率。其中发射功率用于指示每次发送探测消息使用的功率，当多次接收到的探测消息中的发射功率相同时，可以直接将多次接收到的接收功率进行比较；若接收到的探测消息中的发射功率不同时，则需要对接收功率进行相应处理后在进行比较。以图3为例，RSU1在T0时刻广播发送探测消息时的发射功率为50dbm，第一用户终端得到的接收功率为24dbm，若在T1时刻广播发送探测消息时的发射功率为24bdm，第一用户终端得到的接收功率为14dbm，则探测消息中未携带发射功率时，得到的第一用户终端的行驶方向是远离RSU1，而实际上确实靠近RSU1，因此在探测消息中需要携带发射功率。
此外上述实施例中的探测消息可以采用D2D discovery(终端直通探测)技术中的消息，如D2D discovery message(D2D探测消息)或者D2D communication message(D2D通信消息)，同样的第一用户终端向第二路边单元上传的各种信息也可以携带与反馈消息中上传，其中反馈消息也可以采用 D2D discovery技术中的消息，如D2D discovery message或者D2D communication message。
并且之所以可以采用接收功率来得到相对位置和行驶方向是因为考虑到路口区域相对开阔，建筑环境相对简单，这样可假设路口范围内第一用户终端到各RSU均有可视路线，即影响路损的最大因素为距离；可以假设由于建筑物遮挡导致的阴影衰落差异强相关，即阴影衰落值类似。因此，可以使用上述探测消息的接收功率来得到第一用户终端的相对位置和行驶方向，以实现对第一用户终端的定位，而这种方式相对于GPS定位(Global Positioning System，全球定位系统)技术来说更为简单，且定位精度不受第一用户终端之间距离的影响。
需要说明的是，本说明书中的各个实施例均采用递进的方式描述，每个实施例重点说明的都是与其他实施例的不同之处，各个实施例之间相同相似的部分互相参见即可。对于装置类实施例而言，由于其与方法实施例基本相似，所以描述的比较简单，相关之处参见方法实施例的部分说明即可。
最后，还需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
对所公开的实施例的上述说明，使本领域技术人员能够实现或使用本发明。对这些实施例的多种修改对本领域技术人员来说将是显而易见的，本文中所定义的一般原理可以在不脱离本发明的精神或范围的情况下，在其它实施例中实现。因此，本发明将不会被限制于本文所示的这些实施例，而是要 符合与本文所公开的原理和新颖特点相一致的最宽的范围。
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本发明的保护范围。

Claims (15)

  1. 一种交通预警方法，其特征在于，所述方法包括：
    第一用户终端或网络侧设备获得所述第一用户终端的行驶情况；
    网络侧设备基于所述第一用户终端的行驶情况，判断所述第一用户终端的行驶情况是否满足交通预警条件，如果是，网络侧设备向第一路边单元发送预警信息；
    所述第一路边单元基于所述第一用户终端的行驶情况确定接收所述预警信息的第二用户终端，并向所述第二用户终端发送所述预警信息，所述预警信息用于触发所述第二用户终端执行与所述预警信息对应的操作。
  2. 根据权利要求1所述的方法，其特征在于，所述网络侧设备包括第二路边单元和安全服务器；
    所述第二路边单元获得所述第一用户终端的行驶情况，基于所述第一用户终端的行驶情况，判断所述第一用户终端的行驶情况是否满足交通预警条件，如果是，向第一路边单元发送预警信息；
    或者
    所述第一用户终端或第二路边单元获得所述第一用户终端的行驶情况；
    所述安全服务器基于所述第一用户终端的行驶情况，判断所述第一用户终端的行驶情况是否满足交通预警条件，如果是，向第一路边单元发送预警信息。
  3. 根据权利要求1所述的方法，其特征在于，所述第一用户终端或网络侧设备获得所述第一用户终端的行驶情况，包括：
    所述第一用户终端或网络侧设备基于当前得到的多个接收功率，得到所述第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到所述第一用户终端的行驶方向，其中所述接收功率由所述第一用户终端或第二路边单元在接收到探测消息后得到。
  4. 根据权利要求3所述的方法，其特征在于，所述第一用户终端或网络侧设备获得所述第一用户终端的行驶情况，包括：所述第一用户终端或网络 侧设备获得所述第一用户终端的行驶参数，并基于所述行驶参数得到所述第一用户终端的行驶状态。
  5. 根据权利要求3所述的方法，其特征在于，所述第一用户终端基于当前得到的多个接收功率，得到所述第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到所述第一用户终端的行驶方向，包括：
    所述第一用户终端接收多个第二路边单元周期性广播发送的探测消息；
    所述第一用户终端在接收到各个探测消息后，得到各个探测消息对应的接收功率；
    所述第一用户终端将当前得到的多个接收功率进行比较，得到所述第一用户终端的相对位置；
    所述第一用户终端将当前得到的每个接收功率分别与上一次接收同一个第二路边单元广播的探测消息后得到的接收功率进行比较，得到所述第一用户终端的行驶方向。
  6. 根据权利要求3所述的方法，其特征在于，所述网络侧设备基于当前得到的多个接收功率，得到所述第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到所述第一用户终端的行驶方向，包括：
    第二路边单元接收第一用户终端周期性发送的探测消息；
    所述第二路边单元在接收到探测消息后，得到所述探测消息对应的接收功率；
    所述第二路边单元将得到的接收功率发送至其他第二路边单元，并接收其他第二路边单元在接收到探测消息后得到的接收功率；
    所述第二路边单元将当前得到的多个接收功率进行比较，得到所述第一用户终端的相对位置，其中当前得到的多个接收功率包括所述第二路边单元在接收到探测消息后得到的接收功率以及其他第二路边单元在接收到探测消息后得到的接收功率；
    所述第二路边单元将当前得到的每个接收功率分别与上一次接收同一个第一用户终端广播的探测消息后得到的接收功率进行比较，得到所述第一用户终端的行驶方向。
  7. 一种交通预警系统，其特征在于，包括：第一用户终端、网络侧设备、第一路边单元和第二用户终端；
    所述第一用户终端或所述网络侧设备，用于获得所述第一用户终端的行驶情况；
    所述网络侧设备，用于基于所述第一用户终端的行驶情况，判断所述第一用户终端的行驶情况是否满足交通预警条件，如果是，向第一路边单元发送预警信息；
    所述第一路边单元，用于基于所述第一用户终端的行驶情况确定接收所述预警信息的第二用户终端，并向所述第二用户终端发送所述预警信息，所述预警信息用于触发所述第二用户终端执行与所述预警信息对应的操作。
  8. 根据权利要求7所述的系统，其特征在于，所述网络侧设备包括第二路边单元和安全服务器；
    所述第二路边单元用于获得所述第一用户终端的行驶情况，基于所述第一用户终端的行驶情况，判断所述第一用户终端的行驶情况是否满足交通预警条件，如果是，向第一路边单元发送预警信息；其中所述向第一路边单元发送预警信息包括所述第二路边单元向第一路边单元直接发送预警信息，或者所述第二路边单元经过所述安全服务器向所述第一路边单元发送预警信息。
  9. 根据权利要求7或8所述的系统，其特征在于，所述第一路边单元由所述交通预警系统中的第二路边单元或安全服务器确定。
  10. 一种交通预警方法，其特征在于，所述方法包括：
    获得第一用户终端的行驶情况；
    基于所述第一用户终端的行驶情况，判断所述第一用户终端的行驶情况是否满足交通预警条件；
    当所述第一用户终端的行驶情况满足所述交通预警条件时，发送预警信息，所述预警信息用于触发第二用户终端执行与所述预警信息对应的操作，所述第二用户终端基于所述第一用户终端的行驶情况得到。
  11. 根据权利要求10所述的方法，其特征在于，所述获得第一用户终端的行驶情况，包括：基于当前得到的多个接收功率，得到所述第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到所述第一用户终端的行驶方向。
  12. 根据权利要求11所述的方法，其特征在于，所述获得第一用户终端的行驶情况，包括：获得所述第一用户终端的行驶参数，并基于所述行驶参数得到所述第一用户终端的行驶状态。
  13. 根据权利要求12所述的方法，其特征在于，所述基于当前得到的多个接收功率，得到所述第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到所述第一用户终端的行驶方向，包括：
    获取第一用户终端周期性发送的探测消息；
    在接收到探测消息后，得到所述探测消息对应的接收功率；
    将所述接收功率发送至其他第二路边单元，并接收其他第二路边单元在接收到探测消息后得到的接收功率；
    将当前得到的多个接收功率进行比较，得到所述第一用户终端的相对位置，其中当前得到的多个接收功率包括所述第二路边单元在接收到探测消息后得到的接收功率以及其他第二路边单元在接收到探测消息后得到的接收功率；
    将当前得到的每个接收功率分别与上一次接收同一个第一用户终端广播的探测消息后得到的接收功率进行比较，得到所述第一用户终端的行驶方向。
  14. 根据权利要求13所述的方法，其特征在于，所述基于当前得到的多个接收功率，得到所述第一用户终端的相对位置，并基于当前得到的多个接收功率与上一次得到的多个接收功率，得到所述第一用户终端的行驶方向， 包括：
    获得第一用户终端上传的接收功率，所述接收功率由第一用户终端在接收到第二路边单元周期性广播发送的探测消息后得到；
    将当前得到的多个接收功率进行比较，得到所述第一用户终端的相对位置；
    将当前得到的每个接收功率分别与上一次接收同一个第二路边单元广播的探测消息后得到的接收功率进行比较，得到所述第一用户终端的行驶方向。
  15. 一种交通预警装置，其特征在于，所述装置包括：
    获得单元，用于获得第一用户终端的行驶情况；
    判断单元，用于基于所述第一用户终端的行驶情况，判断所述第一用户终端的行驶情况是否满足交通预警条件；
    发送单元，用于当所述第一用户终端的行驶情况满足所述交通预警条件时，发送预警信息，所述预警信息用于触发第二用户终端执行与所述预警信息对应的操作，所述第二用户终端基于所述第一用户终端的行驶情况得到。
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CN105096659A (zh) * 2015-09-30 2015-11-25 宇龙计算机通信科技(深圳)有限公司 一种交通预警方法、装置及系统
CN105118330A (zh) * 2015-09-30 2015-12-02 宇龙计算机通信科技(深圳)有限公司 一种交通预警方法、装置及系统

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