CN113487899A - Tunnel traffic information dynamic display method based on V2X technology and intelligent traffic sign - Google Patents

Tunnel traffic information dynamic display method based on V2X technology and intelligent traffic sign Download PDF

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CN113487899A
CN113487899A CN202110715559.2A CN202110715559A CN113487899A CN 113487899 A CN113487899 A CN 113487899A CN 202110715559 A CN202110715559 A CN 202110715559A CN 113487899 A CN113487899 A CN 113487899A
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information
tunnel
mec server
state information
mec
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粘权鑫
毕道坤
蒋才平
方军贵
陈升
周辉
郭威
何甘林
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Guilin University of Electronic Technology
Dongfeng Liuzhou Motor Co Ltd
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Guilin University of Electronic Technology
Dongfeng Liuzhou Motor Co Ltd
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Priority to CN202110715559.2A priority Critical patent/CN113487899A/en
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Priority to CN202111279326.9A priority patent/CN113903187B/en
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096775—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a central station
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/07—Controlling traffic signals
    • G08G1/08—Controlling traffic signals according to detected number or speed of vehicles
    • G—PHYSICS
    • G08—SIGNALLING
    • G08G—TRAFFIC CONTROL SYSTEMS
    • G08G1/00—Traffic control systems for road vehicles
    • G08G1/09—Arrangements for giving variable traffic instructions
    • G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
    • G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
    • G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
    • G08G1/096783—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is a roadside individual element
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]

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  • Life Sciences & Earth Sciences (AREA)
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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
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Abstract

The embodiment of the invention discloses a tunnel traffic information dynamic display method and an intelligent traffic sign based on a V2X technology, which comprises the following steps: information acquisition: the method comprises the steps of taking a V2X technology and an MEC technology as means, and collecting state information of commercial vehicles in a tunnel by laying an OBU and an RSU; and (3) information processing: the MEC server collects and classifies the state information transmitted from the RSU, and transmits the real-time traffic information of commercial vehicles in the tunnel region in real time; information release: real-time traffic information of commercial vehicles in the tunnel area is respectively transmitted to the intelligent traffic sign and the OBU by the MEC server; the commercial vehicle which is about to enter the tunnel acquires traffic information in the tunnel through the intelligent traffic sign, completes the process of deceleration-uniform speed driving, and performs cooperative driving with the commercial vehicle which is driving in the tunnel; commercial vehicles that travel in the tunnel pass through OBU and acquire the traffic conditions in the tunnel, travel with other vehicles in coordination at the induction speed in the tunnel, have improved passage efficiency and security in the tunnel region.

Description

Tunnel traffic information dynamic display method based on V2X technology and intelligent traffic sign
Technical Field
The application relates to the technical field of intelligent traffic, in particular to a tunnel traffic information dynamic display method based on a V2X technology and an intelligent traffic sign.
Background
In some mountainous areas in China, typical medium and long tunnel areas with relatively complex traffic conditions exist, the medium and long tunnel areas have the characteristics of dark light, serious black-white hole effect and the like, and the sight distance of large vehicles such as commercial trucks and the like is seriously insufficient when the large vehicles run in the medium and long tunnel areas. Meanwhile, commercial trucks have the characteristics of more cargos, large inertia and the like, and the commercial trucks are relatively strange in information of the tunnel area before entering the tunnel area to drive, so that the state (speed) of the vehicles cannot be adjusted in time, and the vehicles are easy to collide after entering the tunnel. Through analyzing accidents occurring in the road tunnel area 2001 + 2017 of a certain area, the fact that the accident occurrence rate is in a direct proportion relation with the traffic volume is found, and therefore the traffic safety management of the tunnel area is greatly challenged when large-scale vehicles such as commercial trucks enter the tunnel area.
At present, most tunnel areas are managed only by means of traditional intelligent traffic signs, and the intelligent traffic sign board is a traffic management facility for indicating, managing and controlling traffic by using graphs, colors and symbols, however, due to the static limitation of the intelligent traffic signs, drivers cannot acquire traffic management information in the tunnel areas in time, and cannot adjust the speed of vehicles in time when entering the tunnel. Especially, commercial trucks have a lot of loads and large inertia, and the time for adjusting the running speed is long, so that traffic accidents are easily caused, and the traffic efficiency and safety in a tunnel area are seriously influenced.
Disclosure of Invention
In order to solve the above problems, embodiments of the present invention provide a tunnel traffic information dynamic display method and an intelligent traffic sign based on the V2X technology. The embodiment of the invention takes a V2X technology as a means, and introduces an MEC technology by an OBU and an RSU and by utilizing a PC5 interface; the information of traffic volume, speed and the like in the tunnel area is displayed in real time outside the tunnel area; the method comprises the steps of preparing commercial vehicles entering a tunnel area, acquiring traffic information in the tunnel area in time, completing a deceleration process before entering the tunnel, adjusting the driving state of the commercial vehicles, driving the commercial vehicles into the tunnel area at a uniform speed, avoiding traffic accidents caused by the fact that commercial trucks cannot decelerate in time after entering the tunnel area due to large inertia, and enabling the commercial vehicles to travel together with the commercial vehicles in the tunnel area quickly, efficiently and safely.
The embodiment of the invention adopts the following technical scheme:
a tunnel traffic information dynamic display method based on a V2X technology comprises the following steps:
(1) information acquisition: based on the V2X technology and the MEC technology, acquiring the state information of the commercial vehicle in the tunnel through the OBU, transmitting the state information to the RSU, and transmitting the state information to the MEC server by the RSU; the state information comprises the number, the running speed and the position information of the commercial vehicles in the collected tunnel;
(2) and (3) information processing: the state information transmitted from the RSU is collected and classified through the MEC server, and real-time traffic information of commercial vehicles in a tunnel region is generated; the real-time traffic information of the commercial vehicles in the tunnel area comprises the state information and the induced speed for guiding the commercial vehicles to run in cooperation with other commercial vehicles in the tunnel;
(3) information release: the real-time traffic information of the commercial vehicles in the tunnel region is respectively transmitted to the intelligent traffic sign and the OBU through the MEC server, so that the commercial vehicles about to enter the tunnel can acquire the traffic conditions in the tunnel through the intelligent traffic sign, and the commercial vehicles running in the tunnel can acquire the traffic conditions in the tunnel through the OBU.
For further explanation of the embodiment of the present invention, the MEC server is connected to the RSU unit through a PC5 interface; the MEC server is in wireless communication with the intelligent traffic sign; the RSU and the OBU are in wireless communication.
Further, the embodiment of the present invention is explained in that the MEC server collects and classifies the status information transmitted from the RSU to generate the real-time traffic information of the commercial vehicles in the tunnel area, and the method includes:
when the MEC server receives the state information transmitted by the RSU, the received state information is sent to the UPF, so that the state information is analyzed and subjected to rule adaptation through ULCL drainage, real-time traffic information of commercial vehicles in a tunnel region is generated, and the MEC server and the UPF perform state information transmission through the MP 2;
the method for analyzing the state information and adapting the rule comprises the following steps:
1) obtaining a number of MEC servers arranged within a tunnel region
Figure BDA0003132060030000031
Wherein n isMECNumber of MEC servers, dblindTo pre-alarm the zone length, rcFor the communication range of the MEC server, [ X]Is a rounding function;
2) the MEC server screens vehicles in a tunnel, collects the state information of vehicles in the same direction and generates real-time traffic information of commercial vehicles in the tunnel area; the screening standard is to calculate the vector of the longitude and latitude of the position of the same vehicle at two adjacent time points to obtain the position change information of the same vehicle, so as to screen the vehicles in the same direction according to the position change information of each vehicle.
Further explanation of the embodiment of the present invention is that, when the MEC server processes the state information, a queuing model and 0-1 planning are adopted to reduce the processing delay of the state information;
the method for reducing the information processing delay of the MEC server comprises the following steps:
1) the time delay comprises the time delay of the transmission from the information source of the state information to the MEC server, the time delay of the state information waiting for processing in the MEC server and the time delay of the MEC server processing the state information;
2) the time delay of the transmission from the information source of the state information to the MEC server is
Figure BDA0003132060030000032
Wherein q isijReceiving the status information size, v, of the j vehicles for the ith MEC serverijThe transmission rate from the ith MEC server to the j vehicle;
3) the waiting time delay of the state information in the MEC server is calculated by adopting an M/M/I/J/∞ queuing model; wherein μ and λ are parameters; i is the number of servers; j is the maximum number of containable information in the MEC server in one time point;
service strength of
Figure BDA0003132060030000041
The probability that the non-state information of the MEC server needs to be processed is
Figure BDA0003132060030000042
The probability of J state information processed simultaneously appearing in the MEC server is
Figure BDA0003132060030000043
In the MEC server, the queue length of the state information to be processed is as follows
Figure BDA0003132060030000044
Queuing delays summarized at the MEC server are
Figure BDA0003132060030000045
4) The time delay of the MEC server for processing the state information is
Figure BDA0003132060030000046
Total time delay of
Figure BDA0003132060030000047
5) Converting the problem distributed to the ith MEC server by processing the state information of each vehicle j into a 0-1 planning problem, and distributing the corresponding state information to the MEC server according to a planning result:
Figure BDA0003132060030000048
Figure BDA0003132060030000051
Figure BDA0003132060030000052
Figure BDA0003132060030000053
S4：xijt∈{0,1}
wherein, xijtFor the allocation of decision variables, r, from iMEC server to j vehicles during tijRate of processing j vehicle data for iMEC, dijtHandling j Total delay, V, of vehicle for iMEC in t timeiAccumulating available communication resources for the MEC server in the tunnel environment; riAccumulating available computing resources for the MEC server; i ═ 1, 2.. times, I } respectively represent MEC servers in different locations.
The embodiment of the invention also provides an intelligent traffic sign, which is applied to the tunnel traffic information dynamic display method based on the V2X technology and mainly comprises an information receiving module, an information reading module, an LED driving module and a display module; the output port of the information receiving module is connected with the information reading module, and the input port receives the state information transmitted by the MEC server; the information reading module comprises an STM32 single chip microcomputer and a word stock chip; the STM32 single chip microcomputer is provided with a UART interface, an SPI interface I and an SPI interface II; the input port of the UART interface is connected with the information receiving module, and the output port of the UART interface is connected with the input port of the SPI interface I; the word stock chip mutually transmits state information with the STM32 single chip microcomputer through an SPI (serial peripheral interface) I; the output port of the SPI interface I is connected with the input port of the SPI interface II, and the output end of the SPI interface II is connected with the LED driving module; the LED driving module comprises a CPLD (Complex Programming logic device) and a FLASH memory; the CPLD is provided with an SPI interface III, a FLASH controller, an LED driving unit and a GPIO interface; the input end of the SPI interface III is connected with the SPI interface II, and the output end of the SPI interface III is connected with the input end of the FLASH controller; the FLASH memory reads and writes state information through a FLASH controller; the output end of the FLASH controller is connected with the input end of the LED driving unit, the output end of the LED driving unit is connected with the input end of the GPIO interface, and the output end of the GPIO interface is connected with the display module.
Preferably, the information receiving module adopts an ESP8266 wireless information receiving module.
Preferably, the display module adopts an LED display screen.
The embodiment of the invention has the advantages that:
1. the embodiment of the invention adopts a V2X technology as a means, introduces an MEC technology through an OBU and an RSU, and realizes the information of speed, traffic volume and the like in an induction tunnel area.
2. The embodiment of the invention combines the communication technology and the electronic information technology, sets the intelligent traffic sign, and realizes real-time display of information such as traffic volume, speed and the like outside the tunnel area.
3. According to the embodiment of the invention, the intelligent traffic sign is improved, so that the vehicles entering the tunnel area can acquire traffic information in the tunnel area in time and drive into the tunnel area at a uniform speed, traffic accidents caused by the fact that commercial trucks cannot decelerate in time after entering the tunnel area due to large inertia are avoided, the states of the vehicles are adjusted, and the vehicles can effectively cooperate with the vehicles in the tunnel area to drive in a fast, efficient and safe mode.
4. According to the embodiment of the invention, the edge architecture of the MEC server and the UPF is constructed by UPF shunting and introducing the ULCL drainage mode, so that the calculation and storage pressure of a terminal or a roadside intelligent facility is relieved, and the real-time performance and the accuracy of information transmission are ensured.
5. The embodiment of the invention adopts the queuing model and 0-1 planning to reduce the time delay, ensures the real-time interaction between the tunnel region and the intelligent traffic sign, and optimizes the time delay of the MEC server for processing the traffic information inside and outside the tunnel.
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The present application is further described below with reference to the drawings and examples.
Fig. 1 is a schematic application environment diagram of a tunnel traffic information dynamic display method based on the V2X technology according to an embodiment of the present invention.
Fig. 2 is a schematic structural framework diagram of an intelligent traffic sign according to an embodiment of the present invention.
Detailed Description
The embodiments of the present invention will be further described with reference to the following detailed description and accompanying drawings.
In order to make the solution of the present application easier to understand, the following explains some concepts involved in the present application:
V2X (Vehicle to Everything) technique: the Vehicle networking technology, namely the interconnection of vehicles and everything, mainly means that the vehicles are connected with all things by means of a new-generation information communication technology, so that all-around connection and information interaction of vehicles and vehicles (Vehicle to Vehicle), vehicles and roadside Infrastructure (Vehicle to Infrastructure), vehicles and pedestrians and other vulnerable traffic participants (Vehicle to Pedestrian) and vehicles and cloud service platforms (Vehicle to Network) are realized.
RSU (road Side Unit): the transliteration is the meaning of a roadside Unit, is installed at the roadside, and is communicated with an On Board Unit (OBU) by adopting a DSRC (differentiated Short Range communication) technology to realize vehicle identification.
Mec (mobile Edge computing) technology: the mobile edge computing technology comprises a user state information plane function and an edge computing platform function; the MEC server may be viewed as a cloud server running at the edge of the mobile network, running a specific task.
UPF (user Port function): user port functions, adapting specific UNI requirements to core functions and system management functions. The user port functions mainly include: A/D conversion; signaling conversion; termination of the UNI function; activation/deactivation of the UNI; processing UNI load path/bearing capacity; and testing, maintaining, managing and controlling functions of the UNI.
ULCL (uplink classifier): the uplink classifier can perform a mechanism of local shunting UL-CL based on a destination address. According to the edge computing service requirement, when the UE moves to a certain position, the SMF is inserted into a local UPF for shunting, the UPF filters the IP address of the uplink state information packet according to a shunting rule issued by the SMF, and shunts the state information packet conforming to the rule to a local DN.
Fig. 1 is a schematic application environment diagram of a tunnel traffic information dynamic display method based on the V2X technology according to an embodiment of the present invention, where an OBU is used to collect status information of commercial vehicles inside a tunnel based on the V2X technology and the MEC technology. The RSU is used for transmitting the state information to the MEC server. And the MEC server is used for summarizing and classifying the state information transmitted from the RSU, generating real-time traffic information of commercial vehicles in the tunnel region, and then respectively transmitting the real-time traffic information of the commercial vehicles in the tunnel region to the intelligent traffic sign and the OBU. The intelligent traffic sign and the OBU are used for displaying real-time traffic information of commercial vehicles in the tunnel region.
Hereinafter, the tunnel traffic information dynamic display method based on the V2X technology provided in the embodiments of the present application will be described and explained in detail through several specific embodiments.
Example 1:
a tunnel traffic information dynamic display method based on a V2X technology comprises the following steps:
(1) information acquisition: based on the V2X technology and the MEC technology, acquiring the state information of the commercial vehicle in the tunnel through the OBU, transmitting the state information to the RSU, and transmitting the state information to the MEC server by the RSU; the state information includes the number, the traveling speed, and the position information of the commercial vehicles collected inside the tunnel.
(2) And (3) information processing: the state information transmitted from the RSU is collected and classified through the MEC server, and real-time traffic information of commercial vehicles in a tunnel region is generated; the real-time traffic information of the commercial vehicles in the tunnel area comprises the state information and the induced speed for guiding the commercial vehicles to run in cooperation with other commercial vehicles in the tunnel.
The induction speed can be obtained by matching the state information from a preset mapping table, and the mapping table is preset with the corresponding relation between the state information and the induction speed and can be preset according to actual requirements.
(3) Information release: the real-time traffic information of the commercial vehicles in the tunnel region is respectively transmitted to the intelligent traffic sign and the OBU through the MEC server, so that the commercial vehicles about to enter the tunnel can acquire the traffic conditions in the tunnel through the intelligent traffic sign, and the commercial vehicles running in the tunnel can acquire the traffic conditions in the tunnel through the OBU.
The real-time traffic information of the commercial vehicles in the tunnel area is transmitted to the intelligent traffic sign through the MEC server, so that the commercial vehicles about to enter the tunnel can acquire the traffic condition in the tunnel through the intelligent traffic sign, the commercial vehicles about to enter the tunnel can adjust the driving state of the commercial vehicles according to the acquired traffic condition, the process of speed reduction-constant speed driving is completed, and the commercial vehicles driving in the tunnel area run in a coordinated mode. Meanwhile, the real-time traffic information of the commercial vehicles in the tunnel region is transmitted to the OBU through the MEC server, so that the commercial vehicles running in the tunnel can acquire the traffic condition in the tunnel through the OBU, the running states of the commercial vehicles running in the tunnel can be adjusted in real time according to the acquired traffic condition, and the commercial vehicles run in the tunnel at an induction speed in cooperation with other commercial vehicles.
Example 2:
this embodiment differs from embodiment 1 in that: the MEC server is connected with the RSU unit through a PC5 interface; the MEC server is in wireless communication with the intelligent traffic sign; the RSU and the OBU are in wireless communication.
Example 3:
this embodiment differs from embodiment 2 in that: when the MEC server and the RSU transmit the state information, introducing the UPF, analyzing and performing rule adaptation on the state information in an ULCL drainage mode to generate real-time traffic information of commercial vehicles in a tunnel region, and transmitting the state information between the MEC server and the UPF through the MP 2.
The method for analyzing the state information and adapting the rule comprises the following steps:
1) number of MEC servers to be deployed in a tunnel region
Figure BDA0003132060030000091
Wherein n isMECNumber of MEC servers, dblindTo pre-alarm the zone length, rcFor the communication range of the MEC server, [ X]Is a rounding function;
2) the MEC server screens vehicles in a tunnel, collects the state information of vehicles in the same direction and generates real-time traffic information of commercial vehicles in the tunnel area; the screening standard is that vectors of position longitude and latitude of the same vehicle at two adjacent time points are calculated to obtain position change information of the same vehicle, the same-direction vehicle is screened according to the position change information of each vehicle, and then the state information of the same-direction vehicle and the induction speed matched from a preset mapping table according to the state information of the same-direction vehicle are used as real-time traffic information of commercial vehicles in the tunnel area.
For example, the vehicles in the same direction are screened according to the position change information of each vehicle, namely all vehicles with the same vector direction at two adjacent time points are marked as vehicles in the same direction.
Example 4:
this embodiment differs from embodiment 3 in that: when the MEC server processes the state information, a queuing model and 0-1 planning are adopted to reduce the information processing time delay; the method for reducing the information processing delay of the MEC server comprises the following steps:
1) the information processing time delay comprises time delay of information source transmission to the MEC server, time delay of information waiting for processing in the MEC server and time delay of information processing by the MEC server.
2) The time delay of the transmission of the information source to the MEC server is
Figure BDA0003132060030000101
Wherein q isijReceiving the status information size, v, of the j vehicles for the ith MEC serverijThe transmission rate from the ith MEC server to the j vehicle;
3) the waiting time delay of the information in the MEC server is calculated by adopting an M/M/I/J/∞ queuing model; wherein μ and λ are parameters; i is the number of servers; j is the maximum number of containable information in the MEC server at a point in time.
Service strength of
Figure BDA0003132060030000102
The probability that the non-state information of the MEC server needs to be processed is
Figure BDA0003132060030000103
The probability of J state information processed simultaneously appearing in the MEC server is
Figure BDA0003132060030000104
In the MEC server, the queue length of the state information to be processed is as follows
Figure BDA0003132060030000105
Queuing delays summarized at the MEC server are
Figure BDA0003132060030000106
4) The time delay of the MEC server for processing the information is
Figure BDA0003132060030000111
Total time delay of
Figure BDA0003132060030000112
5) Converting the problem distributed to the ith MEC server in the information processing of each vehicle j into a 0-1 planning problem so as to distribute the corresponding state information, namely the state information to the MEC server according to the planning result
Figure BDA0003132060030000113
Figure BDA0003132060030000114
Figure BDA0003132060030000115
Figure BDA0003132060030000116
S4：xijt∈{0,1}
Wherein x isijtFor the allocation of decision variables, r, from iMEC server to j vehicles during tijRate of processing j vehicle data for iMEC, dijtHandling j Total delay, V, of vehicle for iMEC in t timeiAccumulating available communication resources for the MEC server in the tunnel environment; riAccumulating available computing resources for the MEC server; i ═ 1, 2.. times, I } respectively represent MEC servers in different locations.
Example 5:
in one embodiment, as shown in fig. 2, the intelligent traffic sign in the above embodiments includes an information receiving module, an information reading module, an LED driving module, and a display module; the output port of the information receiving module is connected with the information reading module, and the input port receives the state information transmitted by the MEC server; the information reading module comprises an STM32 single chip microcomputer and a word stock chip; the STM32 single chip microcomputer is provided with a UART interface, an SPI interface I and an SPI interface II; the input port of the UART interface is connected with the information receiving module, and the output port of the UART interface is connected with the input port of the SPI interface I; the word stock chip mutually transmits state information with the STM32 single chip microcomputer through an SPI (serial peripheral interface) I; the output port of the SPI interface I is connected with the input port of the SPI interface II, and the output end of the SPI interface II is connected with the LED driving module; the LED driving module comprises a CPLD and a FLASH memory; the CPLD is provided with an SPI interface III, a FLASH controller, an LED driving unit and a GPIO interface; the input end of the SPI interface III is connected with the SPI interface II, and the output end of the SPI interface III is connected with the input end of the FLASH controller; the FLASH memory reads and writes state information through a FLASH controller; the output end of the FLASH controller is connected with the input end of the LED driving unit, the output end of the LED driving unit is connected with the input end of the GPIO interface, and the output end of the GPIO interface is connected with the display module.
The working principle of the intelligent traffic sign is as follows:
the UART interface receives the information processed by the MEC server and transmits the information to the SPI interface I, and meanwhile, the SPI interface I and the word library chip continuously read character dot matrix information from the address by calculating the address of the dot matrix in the chip, so that the processes of modulus taking and conversion are realized; then, the driving module receives information processed by the STM32 single chip microcomputer through an SPI interface II, meanwhile, a read-write process is carried out between the FLASH controller and the FLASH memory, state information is transmitted to the LED driving unit by the FLASH controller, the LED driving unit is waited for driving, and a GPIO interface receives a driving instruction of the LED driving unit and transmits the information to the display module; the display module displays the received information.
Example 6:
this example differs from example 5 in that: the information receiving module adopts an ESP8266 wireless information receiving module.
Example 7:
this example differs from example 6 in that: the display module adopts an LED display screen.
The above embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the embodiments of the present invention, and the scope of the embodiments of the present invention is defined by the claims. Various modifications and equivalents may be made to the embodiments of the invention by those skilled in the art within the spirit and scope of the embodiments of the invention, and such modifications and equivalents should also be considered as falling within the scope of the embodiments of the invention.

Claims (7)

1. A tunnel traffic information dynamic display method based on a V2X technology is characterized by comprising the following steps:
(1) information acquisition: based on the V2X technology and the MEC technology, acquiring the state information of the commercial vehicle in the tunnel through the OBU, transmitting the state information to the RSU, and transmitting the state information to the MEC server by the RSU; the state information comprises the number, the running speed and the position information of the commercial vehicles in the collected tunnel;
(2) and (3) information processing: the state information transmitted from the RSU is collected and classified through the MEC server, and real-time traffic information of commercial vehicles in a tunnel region is generated; the real-time traffic information of the commercial vehicles in the tunnel area comprises the state information and the induced speed for guiding the commercial vehicles to run in cooperation with other commercial vehicles in the tunnel;
(3) information release: the real-time traffic information of the commercial vehicles in the tunnel region is respectively transmitted to the intelligent traffic sign and the OBU through the MEC server, so that the commercial vehicles about to enter the tunnel can acquire the traffic conditions in the tunnel through the intelligent traffic sign, and the commercial vehicles running in the tunnel can acquire the traffic conditions in the tunnel through the OBU.
2. The dynamic tunnel traffic information display method based on the V2X technology as claimed in claim 1, wherein: the MEC server is connected with the RSU unit through a PC5 interface; the MEC server is in wireless communication with the intelligent traffic sign; the RSU and the OBU are in wireless communication.
3. The dynamic tunnel traffic information display method based on the V2X technology as claimed in claim 1, wherein the status information transmitted from the RSU is collected and classified by the MEC server to generate real-time traffic information of commercial vehicles in the tunnel region, including:
when the MEC server receives the state information transmitted by the RSU, the received state information is sent to the UPF, so that the state information is analyzed and subjected to rule adaptation through ULCL drainage, real-time traffic information of commercial vehicles in a tunnel region is generated, and the MEC server and the UPF perform state information transmission through the MP 2;
the method for analyzing the state information and adapting the rule comprises the following steps:
1) obtaining a number of MEC servers arranged within a tunnel region
Figure FDA0003132060020000021
Wherein n isMECNumber of MEC servers, dblindTo pre-alarm the zone length, rcFor the communication range of the MEC server, [ X]Is a rounding function;
2) the MEC server screens vehicles in a tunnel, collects the state information of vehicles in the same direction and generates real-time traffic information of commercial vehicles in the tunnel area; the screening standard is to calculate the vector of the longitude and latitude of the position of the same vehicle at two adjacent time points to obtain the position change information of the same vehicle, so as to screen the vehicles in the same direction according to the position change information of each vehicle.
4. The dynamic tunnel traffic information display method based on the V2X technology as claimed in claim 1, wherein: when the MEC server processes the state information, a queuing model and 0-1 planning are adopted to reduce the processing time delay of the state information;
the method for reducing the information processing delay of the MEC server comprises the following steps:
1) the information processing time delay comprises the time delay from an information source of the state information to the MEC server, the time delay of the state information waiting for processing in the MEC server and the time delay of the MEC server for processing the state information;
2) the time delay of the transmission from the information source of the state information to the MEC server is
Figure FDA0003132060020000022
Wherein q isijReceiving the status information size, v, of the j vehicles for the ith MEC serverijThe transmission rate from the ith MEC server to the j vehicle;
3) the waiting time delay of the state information in the MEC server is calculated by adopting an M/M/I/J/∞ queuing model; wherein μ and λ are parameters; i is the number of servers; j is the maximum number of containable information in the MEC server in one time point;
service strength of
Figure FDA0003132060020000031
The probability that the non-state information of the MEC server needs to be processed is
Figure FDA0003132060020000032
The probability of J state information processed simultaneously appearing in the MEC server is
Figure FDA0003132060020000033
In the MEC server, the queue length of the state information to be processed is as follows
Figure FDA0003132060020000034
Queuing delays summarized at the MEC server are
Figure FDA0003132060020000035
4) The time delay of the MEC server for processing the state information is
Figure FDA0003132060020000036
Total time delay of
Figure FDA0003132060020000037
5) Converting the problem distributed to the ith MEC server by processing the state information of each vehicle j into a 0-1 planning problem, and distributing the corresponding state information to the MEC server according to a planning result:
Figure FDA0003132060020000038
Figure FDA0003132060020000041
Figure FDA0003132060020000042
Figure FDA0003132060020000043
S4：xijt∈{0,1}
wherein x isijtFor the allocation of decision variables, r, from iMEC server to j vehicles during tijRate of processing j vehicle data for iMEC, dijtHandling j Total delay, V, of vehicle for iMEC in t timeiAccumulating available communication resources for the MEC server in the tunnel environment; riAccumulating available computing resources for the MEC server; i ═ 1, 2.. times, I } respectively represent MEC servers in different locations.
5. An intelligent traffic sign applied to the tunnel traffic information dynamic display method based on the V2X technology according to any one of claims 1-4, wherein: the system comprises an information receiving module, an information reading module, an LED driving module and a display module;
the output port of the information receiving module is connected with the information reading module, and the input port receives the state information transmitted by the MEC server;
the information reading module comprises an STM32 single chip microcomputer and a word stock chip; the STM32 single chip microcomputer is provided with a UART interface, an SPI interface I and an SPI interface II; the input port of the UART interface is connected with the information receiving module, and the output port of the UART interface is connected with the input port of the SPI interface I; the word stock chip mutually transmits state information with the STM32 single chip microcomputer through an SPI (serial peripheral interface) I; the output port of the SPI interface I is connected with the input port of the SPI interface II, and the output end of the SPI interface II is connected with the LED driving module;
the LED driving module comprises a CPLD and a FLASH memory; the CPLD is provided with an SPI interface III, a FLASH controller, an LED driving unit and a GPIO interface; the input end of the SPI interface III is connected with the SPI interface II, and the output end of the SPI interface III is connected with the input end of the FLASH controller; the FLASH memory reads and writes state information through a FLASH controller; the output end of the FLASH controller is connected with the input end of the LED driving unit, the output end of the LED driving unit is connected with the input end of the GPIO interface, and the output end of the GPIO interface is connected with the display module.
6. The intelligent traffic sign according to claim 5, wherein: the information receiving module adopts an ESP8266 wireless information receiving module.
7. The intelligent traffic sign according to claim 5, wherein: the display module adopts an LED display screen.
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