CN113923624B - ZigBee-based Internet of vehicles communication method and system - Google Patents
ZigBee-based Internet of vehicles communication method and system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- H—ELECTRICITY
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- H04W84/00—Network topologies
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Abstract
The utility model discloses a ZigBee-based Internet of vehicles communication method and system, wherein the system comprises a vehicle-mounted communication unit and a road facility communication unit, and networking and information interaction are respectively carried out by arranging a ZigBee wireless communication module; by starting the ZigBee communication system, a ZigBee network which CAN cooperate is automatically detected in a communication range, dynamic networking is performed after detection, information interaction is performed, information to be transmitted is converted into wireless signals according to a communication content classification and classification standard, the wireless signals are transmitted to the ZigBee network, the received wireless signals are converted into CAN signals and are processed according to a communication message priority control method to be broadcasted, and a driver CAN know related information of road traffic in the first time and make judgment in time, so that driving is safer.
Description
Technical Field
The utility model belongs to the technical field of communication, and particularly relates to a ZigBee-based Internet of vehicles communication method and system.
Background
The internet of vehicles is more fully interpreted as a connection of vehicles to vehicles, vehicles to pedestrians, vehicles to roads, vehicles to infrastructure (signal lights, etc.), vehicles to networks, vehicles to clouds. In the context of mobile internet, internet of vehicles is one of the most promising industries. Because of the scale effect and the industrial driving effect, the Internet of vehicles is becoming the first choice for the demonstration application of the Internet of things, and the time-generation characteristic is ubiquitous interconnection and intelligent service based on vehicle-mounted communication. The application of the internet of vehicles can effectively relieve urban traffic jams, reduce vehicle tail gas pollution, reduce potential safety hazards of vehicles, optimize the driving route of a vehicle owner, shorten the travel time and make the travel more predictable.
The existing networking modes of the car networking include T-BOX, GPRS, DSRC, LTE-V and the like, but the technology has the following problems: (1) The vehicle-mounted T-BOX solves the problems of connection between vehicles and networks and between vehicles and cloud, and communication between vehicles is not realized; (2) The GPRS network realizes the communication between vehicles, the network delay is more than 100ms, and the communication requirement between vehicles running at high speed cannot be met; (3) The existing DSRC technology and LTE-V technology have high data transmission rate and short delay, but both the two technical schemes need to run by relying on a base station, and the manufacturing cost is high. (4) The technology needs the corresponding communication device to have higher cost, the communication protocol is complex, the flexible communication networking is not facilitated, and the communication content is not standardized and graded after the networking, so that a receiving end cannot prompt to broadcast important information in time, the judgment delay is caused, and the life safety of a driver can be even endangered when the judgment is serious.
Patent CN105142115 discloses a vehicle-mounted communication system based on ZigBee and a communication method thereof, where the system includes a plurality of vehicle-mounted terminals, a ZigBee networking module, and a background management platform. According to the utility model, the ZigBee technology architecture is utilized to construct the self-organized vehicle-mounted communication network, a plurality of vehicle-mounted terminals are established to form the ZigBee network, each vehicle-mounted terminal in the ZigBee network can communicate with each other, and mutual sharing of vehicle-mounted data can be realized. The patent discloses a ZigBee-based dynamic self-organizing network, which has flexible networking mode and low cost of a communication device, but only aims at the link between vehicles, does not realize the interaction with other networks, and does not carry out standardized classification on communication contents.
Disclosure of Invention
Aiming at the defects of small network interaction range, no standardized classification of communication content and the like in the prior art, the utility model provides a ZigBee-based Internet of vehicles communication method and system for solving the problems.
The utility model provides a ZigBee-based Internet of vehicles communication method, which comprises the following steps:
s100: detecting whether a ZigBee network exists around a single automobile serving as a node;
s200: dynamic networking of a plurality of nodes is realized by using a ZigBee short-distance wireless communication technology;
s300: according to the classification and grading standard of the communication content, converting the information into wireless signals through the Internet of vehicles communication system according to the priority level, sequentially sending the wireless signals to the outside, and sequentially displaying and playing the received information;
in step S200, the implementing dynamic networking of a plurality of nodes includes: a single automobile is used as a node, vehicles running in the same direction are identified by updating the vehicle position information in the ZigBee wireless signal coverage area in real time, and node connection is established with the vehicles running in the same direction and dynamic networking is carried out; or the implementing the dynamic networking of the plurality of nodes includes: a single automobile is used as one node, a single road facility is used as another node, and node connection is established among a plurality of nodes in the ZigBee wireless signal coverage area and dynamic networking is carried out.
Further, in step S300, priority control is adopted for the communication message, including the steps of:
s301: starting to receive information;
s302: when only 1 message is received in the message queue, completing message confirmation and executing the message; when the information in the received information queue is more than 1 piece, executing the next judging work;
s303: judging whether a plurality of pieces of information are sent by the same node, and when the information are sent by the same node, adopting the latest information to confirm and execute; when the information is sent by different nodes, executing the next judging work;
s304: dividing the priority of different information according to the classification and grading standard of the communication content;
s305: sequentially executing information according to the information priority;
s306: discarding the failure message after the execution of the effective message is completed; step S301 is performed simultaneously to enter the next round of looping.
Further, the communication content classification grading standard classifies communication information, wherein the communication information comprises: early warning type information, broadcast type information, warning type information and orientation type information;
based on the above-mentioned various types of communication information, the specific communication contents thereof respectively adopt natural numbers to carry out assignment method to divide priority levels, including:
the early warning information comprises the following communication contents: vehicle collision information, the priority value of which is 1;
the broadcast-type information includes: one key asking for help information, its priority value is 2;
vehicle position information having a priority value of 4;
vehicle speed, its priority value is 6;
vehicle position information having a priority value of 4;
weather information, the priority value of which is 5;
road control information having a priority value of 5;
traffic light information with a priority value of 7;
warning class information, the communication content of which includes: voice information, the priority value of which is 3;
the directional class information, its communication content includes: license plate;
wherein the priority level of the communication content with the priority value of 1 is highest, and the priority level of other communication content gradually decreases with the increase of the priority value.
Furthermore, in order to realize the ZigBee-based Internet of vehicles communication method, the utility model also provides a ZigBee-based Internet of vehicles communication system, which comprises an on-vehicle communication unit arranged in a vehicle and a road facility communication unit arranged in a road facility.
Further, the vehicle-mounted communication unit comprises a first ZigBee wireless communication module, a first rechargeable battery, a first gain antenna, a text information module, a voice information module, a Can-ZigBee signal conversion module and a Can transceiver.
Further, the road facility communication unit comprises a second ZigBee wireless communication module, a second rechargeable battery, a second gain antenna, a GPS access network module, a third gain antenna and a road facility function module.
In general, the above technical solutions conceived by the present utility model, compared with the prior art, enable the following beneficial effects to be obtained:
1. according to the ZigBee-based vehicle networking communication method, the vehicle and road facility nodes are detected and then are dynamically networked and are subjected to information interaction, the information to be transmitted is converted into the wireless signal according to the priority level according to the classification and grading standard of the communication content and is transmitted to the ZigBee network, the received wireless signal is converted into the CAN signal and is processed according to the communication message priority control method and then is broadcasted, a driver CAN know related road traffic information in the first time and make judgment in time, and driving is safer
2. According to the ZigBee-based vehicle networking communication method, through the arrangement of the communication content classification grading mark, the information interacted on the ZigBee network is subjected to internal classification, and different information is subjected to standardized management and control, so that information redundancy caused by excessive disorder of the information is avoided; furthermore, the information content is subjected to assignment management according to the priority level, and is played or transmitted according to the assigned weight, so that all nodes in the ZigBee network can receive important information preferentially and are prevented from being covered by other information.
3. According to the ZigBee-based vehicle networking communication method, vehicles running in the same direction are identified by updating the vehicle position information in the ZigBee wireless signal coverage area in real time, and connection is established with the vehicles running in the same direction. By the method, communication connection with irrelevant vehicles can be forbidden, so that the number of networking nodes in the area is reduced, and the communication efficiency is improved.
4. The ZigBee-based Internet of vehicles communication system provided by the utility model is based on ZigBee for networking, and has the advantages of high capacity, short time delay, low cost, low power consumption and the like.
Drawings
Fig. 1 is a schematic flow chart of a ZigBee-based internet of vehicles communication method according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of classification and classification criteria of vehicle-to-vehicle communication content in an embodiment of the utility model;
FIG. 3 is a schematic diagram of classification and classification criteria of traffic content of a vehicle and a road facility according to an embodiment of the present utility model;
FIG. 4 is a schematic diagram of a communication message priority control flow in an embodiment of the present utility model;
fig. 5 is a schematic diagram of a ZigBee-based internet of vehicles information broadcasting mechanism in an embodiment of the present utility model;
fig. 6 is a schematic communication topology diagram of a ZigBee-based internet of vehicles communication system in an embodiment of the present utility model;
fig. 7 is a schematic structural diagram of a vehicle-mounted communication unit of the ZigBee-based internet of vehicles communication system in the embodiment of the present utility model;
fig. 8 is a schematic diagram of a road facility communication unit of the ZigBee-based internet of vehicles communication system in an embodiment of the present utility model.
Like reference numerals denote like technical features throughout the drawings, in particular: the system comprises a 1-vehicle-mounted communication unit, a 11-first ZigBee wireless communication module, a 12-first rechargeable battery, a 13-first gain antenna, a 14-text information module, a 15-voice information module, a 16-Can-ZigBee signal conversion module, a 17-Can transceiver, a 2-road facility communication unit, a 21-second ZigBee wireless communication module, a 22-second rechargeable battery, a 23-second gain antenna, a 24-GPS access network module, a 25-third gain antenna and a 26-road facility function module.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model. In addition, the technical features of the embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
As shown in fig. 1-8, the utility model provides a ZigBee-based internet of vehicles communication method and system, the system includes a vehicle communication unit 1 and a road facility communication unit 2, which are respectively networked after forming communication nodes by being provided with ZigBee wireless communication modules; by starting the ZigBee communication system, a ZigBee network which CAN cooperate is automatically detected in a communication range, dynamic networking is performed after detection, information interaction is performed, information to be transmitted is converted into wireless signals according to a communication content classification and classification standard, the wireless signals are transmitted to the ZigBee network, the received wireless signals are converted into CAN signals, the CAN signals are processed according to a communication message priority control method and then are broadcasted, and a driver CAN know related road traffic information in the first time and make judgment in time, so that driving is safer. The Internet of vehicles of the present utility model is networked based on ZigBee, and comprises: (1) The capacity is high, a plurality of nodes can be included for networking, data communication can be carried out between any nodes in the network, and when the nodes are added and withdrawn, the network has an automatic repairing function, so that dynamic networking is realized; (2) Short time delay, only 30ms is needed for node connection to enter the network, which is far lower than other networking modes; (3) The ZigBee wireless communication system has the advantages of low cost and low power consumption, reduces the requirements on a communication controller by greatly simplifying protocols (less than 1/10 of Bluetooth), and ensures that the ZigBee chip has lower purchase price and can continuously work for months in a low power consumption standby mode.
In an embodiment of the present utility model, the flow of the ZigBee-based internet of vehicles communication method is shown in fig. 1, and includes the following steps:
s100: detecting whether a ZigBee network exists around a single automobile serving as a node;
s200: dynamic networking of a plurality of nodes is realized by using a ZigBee short-distance wireless communication technology;
s300: according to the classification and grading standard of the communication content, the information is converted into wireless signals through the Internet of vehicles communication system according to the priority level, the wireless signals are sequentially transmitted to the outside, and the received information is sequentially displayed and played.
In step S100, a single automobile is used as a node, a ZigBee wireless communication module is installed in the node, and other nodes are searched for networking by sending wireless signals; further, in step S200, a single vehicle is used as a node, a single road facility is used as another node, after the internet of vehicles communication system is started, the coverage area of the ZigBee wireless communication in the actual high-speed driving environment is 600 meters to 1000 meters, after the adjacent node is found, a plurality of nodes establish node connection and can dynamically perform networking according to the ZigBee communication protocol; further, in step S300, information interaction is performed between the plurality of nodes through wireless signals in the ZigBee network, and the interacted information may be classified into priority according to the classification and classification standard of the communication content, and the order of receiving or transmitting the information is determined, so that the important information reaches the receiver at the first time, and is prevented from being covered by other secondary information.
In the embodiment of the present utility model, the classification and grading criteria of the communication content are specifically shown in fig. 2 and fig. 3, where the types of the communication information that can be classified include: early warning type information, broadcast type information, warning type information and orientation type information; based on each type of communication information, the specific communication content adopts a natural number to carry out assignment method to divide priority levels, and the method comprises the following steps:
the early warning information comprises the following communication contents: vehicle collision information, the priority value of which is 1;
broadcast class information including the communication contents: one key asking for help information, its priority value is 2;
vehicle position information having a priority value of 4;
vehicle speed, its priority value is 6;
vehicle position information having a priority value of 4;
weather information, the priority value of which is 5;
road control information having a priority value of 5;
traffic light information with a priority value of 7;
warning class information, including the communication contents: voice information, the priority value of which is 3;
the directional class information includes the following communication contents: license plate.
Wherein the priority level of the communication content with the priority value of 1 is highest, and the priority level of other communication content gradually decreases with the increase of the priority value.
In the communication content classification and classification standard of the embodiment of the utility model, different information is standardized and controlled by carrying out internal classification on the information interacted on the ZigBee network, so that information redundancy caused by excessive disorder of the information is avoided; furthermore, the information content is subjected to assignment management according to the priority level, and is played or transmitted according to the assigned weight, so that all nodes in the ZigBee network can receive important information preferentially and are prevented from being covered by other information.
As shown in fig. 4, another embodiment of the present utility model further provides a method for controlling priority of a communication message according to a classification and classification standard of communication contents, including the steps of:
s301: starting to receive information;
s302: when only 1 message is received in the message queue, completing message confirmation and executing the message; when the information in the received information queue is more than 1 piece, executing the next judging work;
s303: judging whether a plurality of pieces of information are sent by the same node, and when the information are sent by the same node, adopting the latest information to confirm and execute; when the information is sent by different nodes, executing the next judging work;
s304: dividing the priority of different information according to the classification and grading standard of the communication content;
s305: sequentially executing information according to the information priority;
s306: discarding the failure message after the execution of the effective message is completed; step S301 is performed simultaneously to enter the next round of looping.
In the communication message priority control method of the embodiment of the utility model, the failure message is a useless message after the message loses timeliness due to the play sequence problem and the section where the message is missed is discarded after judgment so as to avoid occupying the memory.
As shown in fig. 5, another embodiment of the present utility model provides a ZigBee-based internet of vehicles information broadcasting mechanism, where, through a ZigBee network, a road facility and a plurality of vehicles implement a plurality of functional requirements, such as: the charging gate performs information interaction with the vehicle through the ZigBee wireless communication module to realize no-parking charging; the traffic signal lamp device broadcasts the state of the traffic indicator lamp of the front intersection in advance through the ZigBee wireless communication module, reminds the vehicle to be ready in advance, and records the illegal vehicle; the speed measuring device can also adopt a ZigBee wireless communication module to perform data interaction with the vehicle so as to acquire vehicle speed information; road conditions and weather information can be broadcast through a ZigBee wireless communication module by any road facility with a GPRS module; a rescue request for the vehicle may also be received.
In another embodiment of the present utility model, the topology structure of the ZigBee network is a mesh structure as shown in fig. 6, and the vehicles traveling in the same direction are identified by updating the vehicle location information in the coverage area of the ZigBee wireless signal in real time, and a connection is established with the vehicles traveling in the same direction. By the method, communication connection with irrelevant vehicles can be forbidden, so that the number of networking nodes in the area is reduced, and the communication efficiency is improved. In practice, there is a need for intercommunication only between vehicles in the same area. Therefore, zigBee wireless communication is well suited for such application scenarios: the communication requirements between vehicles in adjacent areas mainly share geographic information and vehicle speed information, so that the vehicles in the areas can know in advance or know traffic states in the areas in general, drivers can know traffic states outside the visible range, judgment is made in advance, and the road traffic safety is improved. For example, after a car accident occurs in front of a highway, the accident car can immediately broadcast information to warn the following car to avoid a deceleration, so as to avoid a continuous collision event.
As shown in fig. 7 and 8, another embodiment of the present utility model further provides a ZigBee-based internet of vehicles communication system, including an in-vehicle communication unit 1 disposed in a vehicle and a road facility communication unit 2 disposed in a road facility.
The vehicle-mounted communication unit 1 comprises a first ZigBee wireless communication module 11, a first rechargeable battery 12, a first gain antenna 13, a text information module 14, a voice information module 15, a Can-ZigBee signal conversion module 16 and a Can transceiver 17. The first rechargeable battery 12 is electrically connected with the first ZigBee wireless communication module 11 and supplies power to the first ZigBee wireless communication module 11; the first gain antenna 13 is in communication connection with the first ZigBee wireless communication module 11, and is used for gain the ability to transmit or receive wireless signals; the text information module 14 and the voice information module 15 are in communication connection with the first ZigBee wireless communication module 11, and can send edited voice or text information to the ZigBee network through the first ZigBee wireless communication module 11, or display information received by the first ZigBee wireless communication module 11 in a voice broadcast and text form; the Can transceiver 17 is in communication connection with the Can-ZigBee signal conversion module 16, the Can-ZigBee signal conversion module 16 is in communication connection with the first ZigBee wireless communication module 11, can modulate Can messages into ZigBee wireless signals through the Can transceiver 17 and Can transmit to the outside, can also convert ZigBee wireless signals into Can messages, and then transmits and displays in the vehicle.
The infrastructure communication unit 2 includes a second ZigBee wireless communication module 21, a second rechargeable battery 22, a second booster antenna 23, a GPS access network module 24, a third booster antenna 25, and an infrastructure function module 26. The second gain antenna 23 is in communication connection with the second ZigBee wireless communication module 21, and the third gain antenna 25 is in communication connection with the GPS access network module 24; the second rechargeable battery 22 is electrically connected with the second ZigBee wireless communication module 21, and supplies power to the first ZigBee wireless communication module 21; the road facility function module 26 and the GPS access network module 24 are in communication connection with the second ZigBee wireless communication module 21, so that information interaction between road facilities and vehicles is realized.
It will be readily appreciated by those skilled in the art that the foregoing description is merely a preferred embodiment of the utility model and is not intended to limit the utility model, but any modifications, equivalents, improvements or alternatives falling within the spirit and principles of the utility model are intended to be included within the scope of the utility model.
Claims (5)
1. The ZigBee-based internet of vehicles communication method is characterized by comprising the following steps:
s100: detecting whether a ZigBee network exists around a single automobile serving as a node;
s200: dynamic networking of a plurality of nodes is realized by using a ZigBee short-distance wireless communication technology;
s300: according to the classification and grading standard of the communication content, converting the information into wireless signals through the Internet of vehicles communication system according to the priority level, sequentially sending the wireless signals to the outside, and sequentially displaying and playing the received information;
in step S200, the implementing dynamic networking of a plurality of nodes includes: a single automobile is used as a node, vehicles running in the same direction are identified by updating the vehicle position information in the ZigBee wireless signal coverage area in real time, and node connection is established with the vehicles running in the same direction and dynamic networking is carried out; or the implementing the dynamic networking of the plurality of nodes includes: a single automobile is used as one node, a single road facility is used as another node, and node connection is established among a plurality of nodes in the ZigBee wireless signal coverage area and dynamic networking is carried out.
2. The ZigBee-based internet of vehicles communication method according to claim 1, wherein in step S300, priority control is adopted for the communication message, including the steps of:
s301: starting to receive information;
s302: when only 1 message is received in the message queue, completing message confirmation and executing the message; when the information in the received information queue is more than 1 piece, executing the next judging work;
s303: judging whether a plurality of pieces of information are sent by the same node, and when the information are sent by the same node, adopting the latest information to confirm and execute; when the information is sent by different nodes, executing the next judging work;
s304: dividing the priority of different information according to the classification and grading standard of the communication content;
s305: sequentially executing information according to the information priority;
s306: discarding the failure message after the execution of the effective message is completed; step S301 is performed simultaneously to enter the next round of looping.
3. The ZigBee-based internet of vehicles communication method according to claim 2, wherein the communication content classification standard classifies communication information, the communication information including: early warning type information, broadcast type information, warning type information and orientation type information;
based on the above-mentioned various types of communication information, the specific communication contents thereof respectively adopt natural numbers to carry out assignment method to divide priority levels, including:
the early warning information comprises the following communication contents: vehicle collision information, the priority value of which is 1;
the broadcast-type information includes: one key asking for help information, its priority value is 2;
vehicle position information having a priority value of 4;
vehicle speed, its priority value is 6;
vehicle position information having a priority value of 4;
weather information, the priority value of which is 5;
road control information having a priority value of 5;
traffic light information with a priority value of 7;
warning class information, the communication content of which includes: voice information, the priority value of which is 3;
the directional class information, its communication content includes: license plate;
wherein the priority level of the communication content with the priority value of 1 is highest, and the priority level of other communication content gradually decreases with the increase of the priority value.
4. A ZigBee-based internet of vehicles communication system for implementing a ZigBee-based internet of vehicles communication method according to any one of claims 1 to 3, comprising an in-vehicle communication unit (1) provided in a vehicle and an asset communication unit (2) provided in an asset.
5. The ZigBee-based internet of vehicles communication system according to claim 4, wherein the vehicle-mounted communication unit (1) comprises a first ZigBee wireless communication module (11), a first rechargeable battery (12), a first gain antenna (13), a text information module (14), a voice information module (15), a Can-ZigBee signal conversion module (16), and a Can transceiver (17).
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