CN112449318B - Message transmission method based on C-V2X vehicle-road cooperative application - Google Patents
Message transmission method based on C-V2X vehicle-road cooperative application Download PDFInfo
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- CN112449318B CN112449318B CN202011146308.9A CN202011146308A CN112449318B CN 112449318 B CN112449318 B CN 112449318B CN 202011146308 A CN202011146308 A CN 202011146308A CN 112449318 B CN112449318 B CN 112449318B
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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
- H04W4/30—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
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/50—Network services
- H04L67/52—Network services specially adapted for the location of the user terminal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a message transmission method based on C-V2X vehicle-road cooperative application, which comprises the following steps: s1, a vehicle-mounted unit sends a message to a vehicle-mounted unit in an effective communication range; s2, the vehicle-mounted unit receives and decodes the message information; s3, the vehicle-mounted unit judges the state of the message information, if the state of the message information is a special emergency state, the message information is preferably sent, if the state of the message information is a general state, the message information is normally sent, and if the state of the message information is a non-sending state, the message is discarded. The vehicle-mounted unit decodes the received message information, marks the state of the message information with the request information of the special vehicle (police car, fire truck, ambulance and the like) as the alarm information as the special emergency state, preferably forwards the message, and improves the transmission efficiency and the success rate of the message.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a message transmission method based on C-V2X vehicle-road cooperative application.
Background
In order to improve the safety and the intellectualization of the traffic system, the concept of an intelligent traffic system based on the cooperation of vehicles and roads is gradually rising. The intelligent traffic can utilize the new generation of communication network and data processing capacity, so that the overall efficiency of the existing traffic system is improved, the energy loss is reduced, and the safety and convenience degree of transportation are improved.
C-V2X is a vehicle-road cooperative key communication technology of a future intelligent transportation system. By utilizing the technology, the intelligent equipment at the traffic intersection can share information such as real-time traffic conditions, road events, pedestrian dynamics and the like, so that driving safety can be greatly improved, congestion can be reduced, traffic accident rate can be reduced and the like. In addition, the C-V2X technology can also provide a low-cost and easy-to-implement technical route and a basic platform for automatic driving, intelligent transportation and Internet of vehicles innovation. C-V2X is a vehicle wireless communication technology formed based on the evolution of cellular network communication technologies such as 3G/4G/5G and the like, and comprises two communication interfaces: one is a short-range direct communication interface between vehicles, people and roads, called a direct communication interface or PC5; the other is a communication interface between the terminal and the base station, called cellular communication interface or Uu, which enables reliable communication over long distances and over a larger range.
Because the C-V2X communication port PC5 is an air broadcast channel, the MAC layers of the vehicle-mounted units and the road side units in the area can both receive DSM messages in the air, and the communication bandwidth on the PC5 port is shared. If the vehicle-mounted units in the area do not limit high-frequency sending messages, the ports of the PC5 are blocked by a large number of messages, so that the communication efficiency is affected, and the sending of the alarm request messages of the special vehicles is liable to be seriously affected.
For example, chinese patent document CN111615078A discloses "a communication method and apparatus of a C-V2X protocol stack", which includes: receiving data of an application layer through a C-V2X protocol stack, and processing the data of the application layer to be sent out through a hardware chip; and receiving a request of the application layer for receiving data through the C-V2X protocol stack to receive the data of the hardware chip, and processing the received data of the hardware chip through the C-V2X protocol stack to transmit the processed data back to the application layer. The disadvantage of the above patent document is that the limitation on the message sending frequency of the vehicle-mounted unit is lacking, and thus the channel is blocked due to the message broadcast storm, so that the message of the alarm request of the special vehicle may not be successfully sent to the specific vehicle-mounted unit within a specified time.
Disclosure of Invention
The invention mainly solves the technical problem that the original message transmission method for the cooperative application of the vehicle and the road has low transmission efficiency on the message with the request information of the special vehicle as the alarm information; the message transmission method based on the C-V2X vehicle road cooperative application is provided, the vehicle-mounted unit decodes the received message information, the state of the message information with the request information of the special vehicle as the alarm information is recorded as the special emergency state, the message is preferably forwarded, and the transmission efficiency and the success rate of the message are improved.
The technical problems of the invention are mainly solved by the following technical proposal: the invention comprises the following steps:
s1, a vehicle-mounted unit sends a message to a vehicle-mounted unit in an effective communication range;
s2, the vehicle-mounted unit receives and decodes the message information;
s3, the vehicle-mounted unit judges the state of the message information, if the state of the message information is a special emergency state, the message information is preferably sent, if the state of the message information is a general state, the message information is normally sent, and if the state of the message information is a non-sending state, the message is discarded.
The vehicle-mounted unit decodes the received message information, marks the state of the message information with the request information of the special vehicle (police car, fire truck, ambulance and the like) as the alarm information as the special emergency state, preferably forwards the message, and improves the transmission efficiency and the success rate of the message.
Preferably, the message information includes ID information, GPS location information, and request information of a vehicle-mounted unit that transmits the message, and the request information includes a service request and an alarm request.
Preferably, the step 3 specifically includes the following steps:
s31, the vehicle-mounted unit judges whether the user-defined field in the message information contains the ID information of the device, if so, the message is discarded, otherwise, the step S32 is carried out;
s32, the vehicle-mounted unit judges the type of the request information in the message information, if the request information is alarm information, the ID information of the vehicle-mounted unit is added into a user-defined field in the message information, the message is immediately forwarded, and if the request information is a service request, the message information is normally sent.
When the self-defined field in the message information received by the vehicle-mounted unit comprises the ID information of the device, the device discards the message when the device forwards the message, so that the occupation of a transmission channel is reduced, when the request information of the message is alarm information, the message is preferentially sent, and the transmission efficiency and the success rate of the message of which the request information is the alarm information are improved.
Preferably, in the step S32, if the request information is service information, the step S33 is performed;
and step S33, calculating the number of messages received in unit time of the vehicle-mounted unit, comparing the number of messages with a set threshold, and if the number of messages received in unit time exceeds the set threshold, suspending the sending of the messages until the number of messages received in unit time is lower than the set threshold, otherwise, normally sending the message information.
When the request information of the message is service information, and the number of messages received in unit time of the vehicle-mounted unit exceeds a set threshold, suspending the transmission of the message with the request information being service information until the number of messages received in unit time is lower than the set threshold, and suppressing the transmission frequency of the message with the request information being service information can improve the transmission frequency of the message with the request information of the special vehicle being alarm information.
Preferably, the content of the message is smaller than a set threshold.
The content of the message is smaller than the set threshold value, so that the information can be ensured to be sent quickly, and the time delay is reduced.
Preferably, in the step S32, the on-board unit selects the on-board unit with the best communication state in the effective communication range to forward the message with the request information being the alarm information.
The vehicle-mounted unit selects the vehicle-mounted unit with the optimal communication state in the effective communication range to forward the message with the request information as the alarm information, so that the transmission efficiency and success rate of the message with the request information as the alarm information are improved.
The beneficial effects of the invention are as follows: 1) When the request information of the message is alarm information, the message is preferentially sent, so that the transmission efficiency and success rate of the message with the request information being alarm information are improved; 2) When the request information of the message is service information, if the number of messages received in unit time of the vehicle-mounted unit exceeds a set threshold, suspending the sending of the message with the request information being service information until the number of messages received in unit time is lower than the set threshold, and inhibiting the sending frequency of the message with the request information being service information can improve the transmission frequency of the message with the request information of the special vehicle being alarm information; 3) The content of the message is smaller than the set threshold value, so that the information can be ensured to be sent quickly, and the time delay is reduced.
Drawings
Fig. 1 is a flow chart of a method of the present invention.
Detailed Description
The technical scheme of the invention is further specifically described below through examples and with reference to the accompanying drawings.
Examples: the message transmission method based on the cooperative application of the C-V2X vehicle road in the embodiment, as shown in fig. 1, comprises the following steps:
s1, each vehicle-mounted unit reports respective position information to a cloud server in real time, and the cloud server calculates the effective communication range of each vehicle-mounted unit;
s2, each vehicle-mounted unit acquires a list of all vehicle-mounted units located in an effective communication range of the current position of the vehicle-mounted unit and position information and communication states corresponding to the vehicle-mounted units in the list from the cloud server;
s3, the vehicle-mounted unit sends a message to the vehicle-mounted unit in an effective communication range;
s4, the vehicle-mounted unit receives and decodes the message information, wherein the message information comprises ID information, GPS position information and request information of the vehicle-mounted unit which sends the message, and the request information comprises a service request and an alarm request;
s5, the vehicle-mounted unit judges the state of the message information, if the state of the message information is a special emergency state, the message information is preferably sent, if the state of the message information is a general state, the message information is normally sent, and if the state of the message information is a non-sending state, the message is discarded:
s51, the vehicle-mounted unit judges whether the user-defined field in the message information contains the ID information of the device, if so, the message is discarded, otherwise, the step S52 is carried out;
s52, the vehicle-mounted unit judges the type of the request information in the message information, if the request information is alarm information, the ID information of the vehicle-mounted unit is added into a user-defined field in the message information, the vehicle-mounted unit with the best communication state in the effective communication range is selected to immediately transmit the message, and if the request information is a service request, the step S53 is carried out;
and step S53, calculating the number of messages received in unit time of the vehicle-mounted unit, comparing the number of messages with a set threshold, and if the number of messages received in unit time exceeds the set threshold, suspending the sending of the messages until the number of messages received in unit time is lower than the set threshold, otherwise, normally sending the message information.
The vehicle-mounted unit decodes the received message information, and the user-defined field in the message information received by the vehicle-mounted unit comprises the ID information of the device, so that the device discards the message when the device forwards the message, and the occupation of a transmission channel is reduced. When the request information of the message is alarm information, the vehicle-mounted unit with the best communication state in the effective communication range is selected to send the message preferentially, so that the transmission efficiency and the success rate of the message with the request information being alarm information are improved. When the request information of the message is service information, and the number of messages received in unit time of the vehicle-mounted unit exceeds a set threshold, suspending the transmission of the message with the request information being service information until the number of messages received in unit time is lower than the set threshold, and suppressing the transmission frequency of the message with the request information being service information can improve the transmission frequency of the message with the request information of the special vehicle being alarm information.
The content of the message is smaller than the set threshold value, so that the information can be ensured to be sent quickly, and the time delay is reduced.
Claims (4)
1. A message transmission method based on C-V2X vehicle road cooperative application is characterized by comprising the following steps:
s1, a vehicle-mounted unit sends a message to a vehicle-mounted unit in an effective communication range;
s2, the vehicle-mounted unit receives and decodes the message information;
s3, judging the state of the message information by the vehicle-mounted unit, if the state of the message information is a special emergency state, preferably sending the message information, if the state of the message information is a general state, normally sending the message information, and if the state of the message information is a non-sending state, discarding the message;
the step 3 specifically comprises the following steps:
s31, the vehicle-mounted unit judges whether the user-defined field in the message information contains the ID information of the device, if so, the message is discarded, otherwise, the step S32 is carried out;
s32, the vehicle-mounted unit judges the type of the request information in the message information, if the request information is alarm information, the ID information of the vehicle-mounted unit is added into a user-defined field in the message information, the message is immediately forwarded, and if the request information is a service request, the step S33 is carried out;
and step S33, calculating the number of messages received in unit time of the vehicle-mounted unit, comparing the number of messages with a set threshold, and if the number of messages received in unit time exceeds the set threshold, suspending the sending of the messages until the number of messages received in unit time is lower than the set threshold, otherwise, normally sending the message information.
2. The message transmission method based on the C-V2X vehicle-road cooperative application according to claim 1, wherein the message information includes ID information, GPS location information and request information of a vehicle-mounted unit that transmits the message, and the request information includes a service request and an alarm request.
3. The message transmission method based on the cooperative application of the C-V2X vehicle road according to claim 1, wherein the content of the message is smaller than a set threshold value.
4. The method for transmitting messages based on cooperative application of C-V2X vehicle routes according to claim 1, wherein in step S32, the vehicle-mounted unit selects the vehicle-mounted unit with the best communication state in the effective communication range to forward the message with the request information being the alarm information.
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| US8923147B2 (en) * | 2011-10-03 | 2014-12-30 | Qualcomm Incorporated | Method and apparatus for filtering and processing received vehicle peer transmissions based on reliability information |
| CN104125152B (en) * | 2013-04-23 | 2018-04-10 | 浙江大学 | A kind of method that In-vehicle networking reliability is improved based on car borne gateway |
| CN103297430B (en) * | 2013-05-24 | 2017-04-26 | 华为技术有限公司 | Data transmission equipment and data transmission method |
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| CN111526496B (en) * | 2020-05-12 | 2023-05-26 | 北京踏歌智行科技有限公司 | C-V2X communication anomaly detection method based on group type command and dispatch |
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